drivers/usb/serial/mos7840.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License as published by
   4  * the Free Software Foundation; either version 2 of the License, or
   5  * (at your option) any later version.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  *
  12  * You should have received a copy of the GNU General Public License
  13  * along with this program; if not, write to the Free Software
  14  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  15  *
  16  * Clean ups from Moschip version and a few ioctl implementations by:
  17  *      Paul B Schroeder <pschroeder "at" uplogix "dot" com>
  18  *
  19  * Originally based on drivers/usb/serial/io_edgeport.c which is:
  20  *      Copyright (C) 2000 Inside Out Networks, All rights reserved.
  21  *      Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
  22  *
  23  */
  24
  25 #include <linux/kernel.h>
  26 #include <linux/errno.h>
  27 #include <linux/init.h>
  28 #include <linux/slab.h>
  29 #include <linux/tty.h>
  30 #include <linux/tty_driver.h>
  31 #include <linux/tty_flip.h>
  32 #include <linux/module.h>
  33 #include <linux/serial.h>
  34 #include <linux/usb.h>
  35 #include <linux/usb/serial.h>
  36 #include <linux/uaccess.h>
  37
  38 /*
  39  * Version Information
  40  */
  41 #define DRIVER_VERSION "1.3.2"
  42 #define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
  43
  44 /*
  45  * 16C50 UART register defines
  46  */
  47
  48 #define LCR_BITS_5             0x00     /* 5 bits/char */
  49 #define LCR_BITS_6             0x01     /* 6 bits/char */
  50 #define LCR_BITS_7             0x02     /* 7 bits/char */
  51 #define LCR_BITS_8             0x03     /* 8 bits/char */
  52 #define LCR_BITS_MASK          0x03     /* Mask for bits/char field */
  53
  54 #define LCR_STOP_1             0x00     /* 1 stop bit */
  55 #define LCR_STOP_1_5           0x04     /* 1.5 stop bits (if 5   bits/char) */
  56 #define LCR_STOP_2             0x04     /* 2 stop bits   (if 6-8 bits/char) */
  57 #define LCR_STOP_MASK          0x04     /* Mask for stop bits field */
  58
  59 #define LCR_PAR_NONE           0x00     /* No parity */
  60 #define LCR_PAR_ODD            0x08     /* Odd parity */
  61 #define LCR_PAR_EVEN           0x18     /* Even parity */
  62 #define LCR_PAR_MARK           0x28     /* Force parity bit to 1 */
  63 #define LCR_PAR_SPACE          0x38     /* Force parity bit to 0 */
  64 #define LCR_PAR_MASK           0x38     /* Mask for parity field */
  65
  66 #define LCR_SET_BREAK          0x40     /* Set Break condition */
  67 #define LCR_DL_ENABLE          0x80     /* Enable access to divisor latch */
  68
  69 #define MCR_DTR                0x01     /* Assert DTR */
  70 #define MCR_RTS                0x02     /* Assert RTS */
  71 #define MCR_OUT1               0x04     /* Loopback only: Sets state of RI */
  72 #define MCR_MASTER_IE          0x08     /* Enable interrupt outputs */
  73 #define MCR_LOOPBACK           0x10     /* Set internal (digital) loopback mode */
  74 #define MCR_XON_ANY            0x20     /* Enable any char to exit XOFF mode */
  75
  76 #define MOS7840_MSR_CTS        0x10     /* Current state of CTS */
  77 #define MOS7840_MSR_DSR        0x20     /* Current state of DSR */
  78 #define MOS7840_MSR_RI         0x40     /* Current state of RI */
  79 #define MOS7840_MSR_CD         0x80     /* Current state of CD */
  80
  81 /*
  82  * Defines used for sending commands to port
  83  */
  84
  85 #define WAIT_FOR_EVER   (HZ * 0)        /* timeout urb is wait for ever */
  86 #define MOS_WDR_TIMEOUT (HZ * 5)        /* default urb timeout */
  87
  88 #define MOS_PORT1       0x0200
  89 #define MOS_PORT2       0x0300
  90 #define MOS_VENREG      0x0000
  91 #define MOS_MAX_PORT    0x02
  92 #define MOS_WRITE       0x0E
  93 #define MOS_READ        0x0D
  94
  95 /* Requests */
  96 #define MCS_RD_RTYPE    0xC0
  97 #define MCS_WR_RTYPE    0x40
  98 #define MCS_RDREQ       0x0D
  99 #define MCS_WRREQ       0x0E
 100 #define MCS_CTRL_TIMEOUT        500
 101 #define VENDOR_READ_LENGTH      (0x01)
 102
 103 #define MAX_NAME_LEN    64
 104
 105 #define ZLP_REG1  0x3A          /* Zero_Flag_Reg1    58 */
 106 #define ZLP_REG5  0x3E          /* Zero_Flag_Reg5    62 */
 107
 108 /* For higher baud Rates use TIOCEXBAUD */
 109 #define TIOCEXBAUD     0x5462
 110
 111 /* vendor id and device id defines */
 112
 113 /* The native mos7840/7820 component */
 114 #define USB_VENDOR_ID_MOSCHIP           0x9710
 115 #define MOSCHIP_DEVICE_ID_7840          0x7840
 116 #define MOSCHIP_DEVICE_ID_7820          0x7820
 117 #define MOSCHIP_DEVICE_ID_7810          0x7810
 118 /* The native component can have its vendor/device id's overridden
 119  * in vendor-specific implementations.  Such devices can be handled
 120  * by making a change here, in moschip_port_id_table, and in
 121  * moschip_id_table_combined
 122  */
 123 #define USB_VENDOR_ID_BANDB              0x0856
 124 #define BANDB_DEVICE_ID_USO9ML2_2        0xAC22
 125 #define BANDB_DEVICE_ID_USO9ML2_2P       0xBC00
 126 #define BANDB_DEVICE_ID_USO9ML2_4        0xAC24
 127 #define BANDB_DEVICE_ID_USO9ML2_4P       0xBC01
 128 #define BANDB_DEVICE_ID_US9ML2_2         0xAC29
 129 #define BANDB_DEVICE_ID_US9ML2_4         0xAC30
 130 #define BANDB_DEVICE_ID_USPTL4_2         0xAC31
 131 #define BANDB_DEVICE_ID_USPTL4_4         0xAC32
 132 #define BANDB_DEVICE_ID_USOPTL4_2        0xAC42
 133 #define BANDB_DEVICE_ID_USOPTL4_2P       0xBC02
 134 #define BANDB_DEVICE_ID_USOPTL4_4        0xAC44
 135 #define BANDB_DEVICE_ID_USOPTL4_4P       0xBC03
 136 #define BANDB_DEVICE_ID_USOPTL2_4        0xAC24
 137
 138 /* This driver also supports
 139  * ATEN UC2324 device using Moschip MCS7840
 140  * ATEN UC2322 device using Moschip MCS7820
 141  */
 142 #define USB_VENDOR_ID_ATENINTL          0x0557
 143 #define ATENINTL_DEVICE_ID_UC2324       0x2011
 144 #define ATENINTL_DEVICE_ID_UC2322       0x7820
 145
 146 /* Interrupt Routine Defines    */
 147
 148 #define SERIAL_IIR_RLS      0x06
 149 #define SERIAL_IIR_MS       0x00
 150
 151 /*
 152  *  Emulation of the bit mask on the LINE STATUS REGISTER.
 153  */
 154 #define SERIAL_LSR_DR       0x0001
 155 #define SERIAL_LSR_OE       0x0002
 156 #define SERIAL_LSR_PE       0x0004
 157 #define SERIAL_LSR_FE       0x0008
 158 #define SERIAL_LSR_BI       0x0010
 159
 160 #define MOS_MSR_DELTA_CTS   0x10
 161 #define MOS_MSR_DELTA_DSR   0x20
 162 #define MOS_MSR_DELTA_RI    0x40
 163 #define MOS_MSR_DELTA_CD    0x80
 164
 165 /* Serial Port register Address */
 166 #define INTERRUPT_ENABLE_REGISTER  ((__u16)(0x01))
 167 #define FIFO_CONTROL_REGISTER      ((__u16)(0x02))
 168 #define LINE_CONTROL_REGISTER      ((__u16)(0x03))
 169 #define MODEM_CONTROL_REGISTER     ((__u16)(0x04))
 170 #define LINE_STATUS_REGISTER       ((__u16)(0x05))
 171 #define MODEM_STATUS_REGISTER      ((__u16)(0x06))
 172 #define SCRATCH_PAD_REGISTER       ((__u16)(0x07))
 173 #define DIVISOR_LATCH_LSB          ((__u16)(0x00))
 174 #define DIVISOR_LATCH_MSB          ((__u16)(0x01))
 175
 176 #define CLK_MULTI_REGISTER         ((__u16)(0x02))
 177 #define CLK_START_VALUE_REGISTER   ((__u16)(0x03))
 178 #define GPIO_REGISTER              ((__u16)(0x07))
 179
 180 #define SERIAL_LCR_DLAB            ((__u16)(0x0080))
 181
 182 /*
 183  * URB POOL related defines
 184  */
 185 #define NUM_URBS                        16      /* URB Count */
 186 #define URB_TRANSFER_BUFFER_SIZE        32      /* URB Size  */
 187
 188 /* LED on/off milliseconds*/
 189 #define LED_ON_MS       500
 190 #define LED_OFF_MS      500
 191
 192 static int device_type;
 193
 194 static const struct usb_device_id moschip_port_id_table[] = {
 195         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 196         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 197         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7810)},
 198         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
 199         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
 200         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
 201         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)},
 202         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
 203         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
 204         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
 205         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
 206         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 207         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)},
 208         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 209         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)},
 210         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
 211         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
 212         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
 213         {}                      /* terminating entry */
 214 };
 215
 216 static const struct usb_device_id moschip_id_table_combined[] __devinitconst = {
 217         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 218         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 219         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7810)},
 220         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
 221         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
 222         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
 223         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)},
 224         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
 225         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
 226         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
 227         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
 228         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 229         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)},
 230         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 231         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)},
 232         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
 233         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
 234         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
 235         {}                      /* terminating entry */
 236 };
 237
 238 MODULE_DEVICE_TABLE(usb, moschip_id_table_combined);
 239
 240 /* This structure holds all of the local port information */
 241
 242 struct moschip_port {
 243         int port_num;           /*Actual port number in the device(1,2,etc) */
 244         struct urb *write_urb;  /* write URB for this port */
 245         struct urb *read_urb;   /* read URB for this port */
 246         struct urb *int_urb;
 247         __u8 shadowLCR;         /* last LCR value received */
 248         __u8 shadowMCR;         /* last MCR value received */
 249         char open;
 250         char open_ports;
 251         char zombie;
 252         wait_queue_head_t wait_chase;   /* for handling sleeping while waiting for chase to finish */
 253         wait_queue_head_t delta_msr_wait;       /* for handling sleeping while waiting for msr change to happen */
 254         int delta_msr_cond;
 255         struct async_icount icount;
 256         struct usb_serial_port *port;   /* loop back to the owner of this object */
 257
 258         /* Offsets */
 259         __u8 SpRegOffset;
 260         __u8 ControlRegOffset;
 261         __u8 DcrRegOffset;
 262         /* for processing control URBS in interrupt context */
 263         struct urb *control_urb;
 264         struct usb_ctrlrequest *dr;
 265         char *ctrl_buf;
 266         int MsrLsr;
 267
 268         spinlock_t pool_lock;
 269         struct urb *write_urb_pool[NUM_URBS];
 270         char busy[NUM_URBS];
 271         bool read_urb_busy;
 272
 273         /* For device(s) with LED indicator */
 274         bool has_led;
 275         bool led_flag;
 276         struct timer_list led_timer1;   /* Timer for LED on */
 277         struct timer_list led_timer2;   /* Timer for LED off */
 278 };
 279
 280 static bool debug;
 281
 282 /*
 283  * mos7840_set_reg_sync
 284  *      To set the Control register by calling usb_fill_control_urb function
 285  *      by passing usb_sndctrlpipe function as parameter.
 286  */
 287
 288 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
 289                                 __u16 val)
 290 {
 291         struct usb_device *dev = port->serial->dev;
 292         val = val & 0x00ff;
 293         dbg("mos7840_set_reg_sync offset is %x, value %x", reg, val);
 294
 295         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 296                                MCS_WR_RTYPE, val, reg, NULL, 0,
 297                                MOS_WDR_TIMEOUT);
 298 }
 299
 300 /*
 301  * mos7840_get_reg_sync
 302  *      To set the Uart register by calling usb_fill_control_urb function by
 303  *      passing usb_rcvctrlpipe function as parameter.
 304  */
 305
 306 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
 307                                 __u16 *val)
 308 {
 309         struct usb_device *dev = port->serial->dev;
 310         int ret = 0;
 311         u8 *buf;
 312
 313         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
 314         if (!buf)
 315                 return -ENOMEM;
 316
 317         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 318                               MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
 319                               MOS_WDR_TIMEOUT);
 320         *val = buf[0];
 321         dbg("mos7840_get_reg_sync offset is %x, return val %x", reg, *val);
 322
 323         kfree(buf);
 324         return ret;
 325 }
 326
 327 /*
 328  * mos7840_set_uart_reg
 329  *      To set the Uart register by calling usb_fill_control_urb function by
 330  *      passing usb_sndctrlpipe function as parameter.
 331  */
 332
 333 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
 334                                 __u16 val)
 335 {
 336
 337         struct usb_device *dev = port->serial->dev;
 338         val = val & 0x00ff;
 339         /* For the UART control registers, the application number need
 340            to be Or'ed */
 341         if (port->serial->num_ports == 4) {
 342                 val |= (((__u16) port->number -
 343                                 (__u16) (port->serial->minor)) + 1) << 8;
 344                 dbg("mos7840_set_uart_reg application number is %x", val);
 345         } else {
 346                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 347                         val |= (((__u16) port->number -
 348                               (__u16) (port->serial->minor)) + 1) << 8;
 349                         dbg("mos7840_set_uart_reg application number is %x",
 350                             val);
 351                 } else {
 352                         val |=
 353                             (((__u16) port->number -
 354                               (__u16) (port->serial->minor)) + 2) << 8;
 355                         dbg("mos7840_set_uart_reg application number is %x",
 356                             val);
 357                 }
 358         }
 359         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 360                                MCS_WR_RTYPE, val, reg, NULL, 0,
 361                                MOS_WDR_TIMEOUT);
 362
 363 }
 364
 365 /*
 366  * mos7840_get_uart_reg
 367  *      To set the Control register by calling usb_fill_control_urb function
 368  *      by passing usb_rcvctrlpipe function as parameter.
 369  */
 370 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
 371                                 __u16 *val)
 372 {
 373         struct usb_device *dev = port->serial->dev;
 374         int ret = 0;
 375         __u16 Wval;
 376         u8 *buf;
 377
 378         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
 379         if (!buf)
 380                 return -ENOMEM;
 381
 382         /* dbg("application number is %4x",
 383             (((__u16)port->number - (__u16)(port->serial->minor))+1)<<8); */
 384         /* Wval  is same as application number */
 385         if (port->serial->num_ports == 4) {
 386                 Wval =
 387                     (((__u16) port->number - (__u16) (port->serial->minor)) +
 388                      1) << 8;
 389                 dbg("mos7840_get_uart_reg application number is %x", Wval);
 390         } else {
 391                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 392                         Wval = (((__u16) port->number -
 393                               (__u16) (port->serial->minor)) + 1) << 8;
 394                         dbg("mos7840_get_uart_reg application number is %x",
 395                             Wval);
 396                 } else {
 397                         Wval = (((__u16) port->number -
 398                               (__u16) (port->serial->minor)) + 2) << 8;
 399                         dbg("mos7840_get_uart_reg application number is %x",
 400                             Wval);
 401                 }
 402         }
 403         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 404                               MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
 405                               MOS_WDR_TIMEOUT);
 406         *val = buf[0];
 407
 408         kfree(buf);
 409         return ret;
 410 }
 411
 412 static void mos7840_dump_serial_port(struct moschip_port *mos7840_port)
 413 {
 414
 415         dbg("***************************************");
 416         dbg("SpRegOffset is %2x", mos7840_port->SpRegOffset);
 417         dbg("ControlRegOffset is %2x", mos7840_port->ControlRegOffset);
 418         dbg("DCRRegOffset is %2x", mos7840_port->DcrRegOffset);
 419         dbg("***************************************");
 420
 421 }
 422
 423 /************************************************************************/
 424 /************************************************************************/
 425 /*             I N T E R F A C E   F U N C T I O N S                    */
 426 /*             I N T E R F A C E   F U N C T I O N S                    */
 427 /************************************************************************/
 428 /************************************************************************/
 429
 430 static inline void mos7840_set_port_private(struct usb_serial_port *port,
 431                                             struct moschip_port *data)
 432 {
 433         usb_set_serial_port_data(port, (void *)data);
 434 }
 435
 436 static inline struct moschip_port *mos7840_get_port_private(struct
 437                                                             usb_serial_port
 438                                                             *port)
 439 {
 440         return (struct moschip_port *)usb_get_serial_port_data(port);
 441 }
 442
 443 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
 444 {
 445         struct moschip_port *mos7840_port;
 446         struct async_icount *icount;
 447         mos7840_port = port;
 448         icount = &mos7840_port->icount;
 449         if (new_msr &
 450             (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
 451              MOS_MSR_DELTA_CD)) {
 452                 icount = &mos7840_port->icount;
 453
 454                 /* update input line counters */
 455                 if (new_msr & MOS_MSR_DELTA_CTS) {
 456                         icount->cts++;
 457                         smp_wmb();
 458                 }
 459                 if (new_msr & MOS_MSR_DELTA_DSR) {
 460                         icount->dsr++;
 461                         smp_wmb();
 462                 }
 463                 if (new_msr & MOS_MSR_DELTA_CD) {
 464                         icount->dcd++;
 465                         smp_wmb();
 466                 }
 467                 if (new_msr & MOS_MSR_DELTA_RI) {
 468                         icount->rng++;
 469                         smp_wmb();
 470                 }
 471         }
 472 }
 473
 474 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
 475 {
 476         struct async_icount *icount;
 477
 478         dbg("%s - %02x", __func__, new_lsr);
 479
 480         if (new_lsr & SERIAL_LSR_BI) {
 481                 /*
 482                  * Parity and Framing errors only count if they
 483                  * occur exclusive of a break being
 484                  * received.
 485                  */
 486                 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
 487         }
 488
 489         /* update input line counters */
 490         icount = &port->icount;
 491         if (new_lsr & SERIAL_LSR_BI) {
 492                 icount->brk++;
 493                 smp_wmb();
 494         }
 495         if (new_lsr & SERIAL_LSR_OE) {
 496                 icount->overrun++;
 497                 smp_wmb();
 498         }
 499         if (new_lsr & SERIAL_LSR_PE) {
 500                 icount->parity++;
 501                 smp_wmb();
 502         }
 503         if (new_lsr & SERIAL_LSR_FE) {
 504                 icount->frame++;
 505                 smp_wmb();
 506         }
 507 }
 508
 509 /************************************************************************/
 510 /************************************************************************/
 511 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 512 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 513 /************************************************************************/
 514 /************************************************************************/
 515
 516 static void mos7840_control_callback(struct urb *urb)
 517 {
 518         unsigned char *data;
 519         struct moschip_port *mos7840_port;
 520         __u8 regval = 0x0;
 521         int result = 0;
 522         int status = urb->status;
 523
 524         mos7840_port = urb->context;
 525
 526         switch (status) {
 527         case 0:
 528                 /* success */
 529                 break;
 530         case -ECONNRESET:
 531         case -ENOENT:
 532         case -ESHUTDOWN:
 533                 /* this urb is terminated, clean up */
 534                 dbg("%s - urb shutting down with status: %d", __func__,
 535                     status);
 536                 return;
 537         default:
 538                 dbg("%s - nonzero urb status received: %d", __func__,
 539                     status);
 540                 goto exit;
 541         }
 542
 543         dbg("%s urb buffer size is %d", __func__, urb->actual_length);
 544         dbg("%s mos7840_port->MsrLsr is %d port %d", __func__,
 545             mos7840_port->MsrLsr, mos7840_port->port_num);
 546         data = urb->transfer_buffer;
 547         regval = (__u8) data[0];
 548         dbg("%s data is %x", __func__, regval);
 549         if (mos7840_port->MsrLsr == 0)
 550                 mos7840_handle_new_msr(mos7840_port, regval);
 551         else if (mos7840_port->MsrLsr == 1)
 552                 mos7840_handle_new_lsr(mos7840_port, regval);
 553
 554 exit:
 555         spin_lock(&mos7840_port->pool_lock);
 556         if (!mos7840_port->zombie)
 557                 result = usb_submit_urb(mos7840_port->int_urb, GFP_ATOMIC);
 558         spin_unlock(&mos7840_port->pool_lock);
 559         if (result) {
 560                 dev_err(&urb->dev->dev,
 561                         "%s - Error %d submitting interrupt urb\n",
 562                         __func__, result);
 563         }
 564 }
 565
 566 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
 567                            __u16 *val)
 568 {
 569         struct usb_device *dev = mcs->port->serial->dev;
 570         struct usb_ctrlrequest *dr = mcs->dr;
 571         unsigned char *buffer = mcs->ctrl_buf;
 572         int ret;
 573
 574         dr->bRequestType = MCS_RD_RTYPE;
 575         dr->bRequest = MCS_RDREQ;
 576         dr->wValue = cpu_to_le16(Wval); /* 0 */
 577         dr->wIndex = cpu_to_le16(reg);
 578         dr->wLength = cpu_to_le16(2);
 579
 580         usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
 581                              (unsigned char *)dr, buffer, 2,
 582                              mos7840_control_callback, mcs);
 583         mcs->control_urb->transfer_buffer_length = 2;
 584         ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 585         return ret;
 586 }
 587
 588 static void mos7840_set_led_callback(struct urb *urb)
 589 {
 590         switch (urb->status) {
 591         case 0:
 592                 /* Success */
 593                 break;
 594         case -ECONNRESET:
 595         case -ENOENT:
 596         case -ESHUTDOWN:
 597                 /* This urb is terminated, clean up */
 598                 dbg("%s - urb shutting down with status: %d", __func__,
 599                         urb->status);
 600                 break;
 601         default:
 602                 dbg("%s - nonzero urb status received: %d", __func__,
 603                         urb->status);
 604         }
 605 }
 606
 607 static void mos7840_set_led_async(struct moschip_port *mcs, __u16 wval,
 608                                 __u16 reg)
 609 {
 610         struct usb_device *dev = mcs->port->serial->dev;
 611         struct usb_ctrlrequest *dr = mcs->dr;
 612
 613         dr->bRequestType = MCS_WR_RTYPE;
 614         dr->bRequest = MCS_WRREQ;
 615         dr->wValue = cpu_to_le16(wval);
 616         dr->wIndex = cpu_to_le16(reg);
 617         dr->wLength = cpu_to_le16(0);
 618
 619         usb_fill_control_urb(mcs->control_urb, dev, usb_sndctrlpipe(dev, 0),
 620                 (unsigned char *)dr, NULL, 0, mos7840_set_led_callback, NULL);
 621
 622         usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 623 }
 624
 625 static void mos7840_set_led_sync(struct usb_serial_port *port, __u16 reg,
 626                                 __u16 val)
 627 {
 628         struct usb_device *dev = port->serial->dev;
 629
 630         usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, MCS_WR_RTYPE,
 631                         val, reg, NULL, 0, MOS_WDR_TIMEOUT);
 632 }
 633
 634 static void mos7840_led_off(unsigned long arg)
 635 {
 636         struct moschip_port *mcs = (struct moschip_port *) arg;
 637
 638         /* Turn off LED */
 639         mos7840_set_led_async(mcs, 0x0300, MODEM_CONTROL_REGISTER);
 640         mod_timer(&mcs->led_timer2,
 641                                 jiffies + msecs_to_jiffies(LED_OFF_MS));
 642 }
 643
 644 static void mos7840_led_flag_off(unsigned long arg)
 645 {
 646         struct moschip_port *mcs = (struct moschip_port *) arg;
 647
 648         mcs->led_flag = false;
 649 }
 650
 651 /*****************************************************************************
 652  * mos7840_interrupt_callback
 653  *      this is the callback function for when we have received data on the
 654  *      interrupt endpoint.
 655  *****************************************************************************/
 656
 657 static void mos7840_interrupt_callback(struct urb *urb)
 658 {
 659         int result;
 660         int length;
 661         struct moschip_port *mos7840_port;
 662         struct usb_serial *serial;
 663         __u16 Data;
 664         unsigned char *data;
 665         __u8 sp[5], st;
 666         int i, rv = 0;
 667         __u16 wval, wreg = 0;
 668         int status = urb->status;
 669
 670         switch (status) {
 671         case 0:
 672                 /* success */
 673                 break;
 674         case -ECONNRESET:
 675         case -ENOENT:
 676         case -ESHUTDOWN:
 677                 /* this urb is terminated, clean up */
 678                 dbg("%s - urb shutting down with status: %d", __func__,
 679                     status);
 680                 return;
 681         default:
 682                 dbg("%s - nonzero urb status received: %d", __func__,
 683                     status);
 684                 goto exit;
 685         }
 686
 687         length = urb->actual_length;
 688         data = urb->transfer_buffer;
 689
 690         serial = urb->context;
 691
 692         /* Moschip get 5 bytes
 693          * Byte 1 IIR Port 1 (port.number is 0)
 694          * Byte 2 IIR Port 2 (port.number is 1)
 695          * Byte 3 IIR Port 3 (port.number is 2)
 696          * Byte 4 IIR Port 4 (port.number is 3)
 697          * Byte 5 FIFO status for both */
 698
 699         if (length && length > 5) {
 700                 dbg("%s", "Wrong data !!!");
 701                 return;
 702         }
 703
 704         sp[0] = (__u8) data[0];
 705         sp[1] = (__u8) data[1];
 706         sp[2] = (__u8) data[2];
 707         sp[3] = (__u8) data[3];
 708         st = (__u8) data[4];
 709
 710         for (i = 0; i < serial->num_ports; i++) {
 711                 mos7840_port = mos7840_get_port_private(serial->port[i]);
 712                 wval =
 713                     (((__u16) serial->port[i]->number -
 714                       (__u16) (serial->minor)) + 1) << 8;
 715                 if (mos7840_port->open) {
 716                         if (sp[i] & 0x01) {
 717                                 dbg("SP%d No Interrupt !!!", i);
 718                         } else {
 719                                 switch (sp[i] & 0x0f) {
 720                                 case SERIAL_IIR_RLS:
 721                                         dbg("Serial Port %d: Receiver status error or ", i);
 722                                         dbg("address bit detected in 9-bit mode");
 723                                         mos7840_port->MsrLsr = 1;
 724                                         wreg = LINE_STATUS_REGISTER;
 725                                         break;
 726                                 case SERIAL_IIR_MS:
 727                                         dbg("Serial Port %d: Modem status change", i);
 728                                         mos7840_port->MsrLsr = 0;
 729                                         wreg = MODEM_STATUS_REGISTER;
 730                                         break;
 731                                 }
 732                                 spin_lock(&mos7840_port->pool_lock);
 733                                 if (!mos7840_port->zombie) {
 734                                         rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
 735                                 } else {
 736                                         spin_unlock(&mos7840_port->pool_lock);
 737                                         return;
 738                                 }
 739                                 spin_unlock(&mos7840_port->pool_lock);
 740                         }
 741                 }
 742         }
 743         if (!(rv < 0))
 744                 /* the completion handler for the control urb will resubmit */
 745                 return;
 746 exit:
 747         result = usb_submit_urb(urb, GFP_ATOMIC);
 748         if (result) {
 749                 dev_err(&urb->dev->dev,
 750                         "%s - Error %d submitting interrupt urb\n",
 751                         __func__, result);
 752         }
 753 }
 754
 755 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
 756                                        const char *function)
 757 {
 758         if (!port) {
 759                 dbg("%s - port == NULL", function);
 760                 return -1;
 761         }
 762         if (!port->serial) {
 763                 dbg("%s - port->serial == NULL", function);
 764                 return -1;
 765         }
 766
 767         return 0;
 768 }
 769
 770 /* Inline functions to check the sanity of a pointer that is passed to us */
 771 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
 772                                          const char *function)
 773 {
 774         if (!serial) {
 775                 dbg("%s - serial == NULL", function);
 776                 return -1;
 777         }
 778         if (!serial->type) {
 779                 dbg("%s - serial->type == NULL!", function);
 780                 return -1;
 781         }
 782
 783         return 0;
 784 }
 785
 786 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
 787                                                  const char *function)
 788 {
 789         /* if no port was specified, or it fails a paranoia check */
 790         if (!port ||
 791             mos7840_port_paranoia_check(port, function) ||
 792             mos7840_serial_paranoia_check(port->serial, function)) {
 793                 /* then say that we don't have a valid usb_serial thing,
 794                  * which will end up genrating -ENODEV return values */
 795                 return NULL;
 796         }
 797
 798         return port->serial;
 799 }
 800
 801 /*****************************************************************************
 802  * mos7840_bulk_in_callback
 803  *      this is the callback function for when we have received data on the
 804  *      bulk in endpoint.
 805  *****************************************************************************/
 806
 807 static void mos7840_bulk_in_callback(struct urb *urb)
 808 {
 809         int retval;
 810         unsigned char *data;
 811         struct usb_serial *serial;
 812         struct usb_serial_port *port;
 813         struct moschip_port *mos7840_port;
 814         struct tty_struct *tty;
 815         int status = urb->status;
 816
 817         mos7840_port = urb->context;
 818         if (!mos7840_port) {
 819                 dbg("%s", "NULL mos7840_port pointer");
 820                 return;
 821         }
 822
 823         if (status) {
 824                 dbg("nonzero read bulk status received: %d", status);
 825                 mos7840_port->read_urb_busy = false;
 826                 return;
 827         }
 828
 829         port = (struct usb_serial_port *)mos7840_port->port;
 830         if (mos7840_port_paranoia_check(port, __func__)) {
 831                 dbg("%s", "Port Paranoia failed");
 832                 mos7840_port->read_urb_busy = false;
 833                 return;
 834         }
 835
 836         serial = mos7840_get_usb_serial(port, __func__);
 837         if (!serial) {
 838                 dbg("%s", "Bad serial pointer");
 839                 mos7840_port->read_urb_busy = false;
 840                 return;
 841         }
 842
 843         data = urb->transfer_buffer;
 844
 845         if (urb->actual_length) {
 846                 tty = tty_port_tty_get(&mos7840_port->port->port);
 847                 if (tty) {
 848                         tty_insert_flip_string(tty, data, urb->actual_length);
 849                         dbg(" %s ", data);
 850                         tty_flip_buffer_push(tty);
 851                         tty_kref_put(tty);
 852                 }
 853                 mos7840_port->icount.rx += urb->actual_length;
 854                 smp_wmb();
 855                 dbg("mos7840_port->icount.rx is %d:",
 856                     mos7840_port->icount.rx);
 857         }
 858
 859         if (!mos7840_port->read_urb) {
 860                 dbg("%s", "URB KILLED !!!");
 861                 mos7840_port->read_urb_busy = false;
 862                 return;
 863         }
 864
 865         /* Turn on LED */
 866         if (mos7840_port->has_led && !mos7840_port->led_flag) {
 867                 mos7840_port->led_flag = true;
 868                 mos7840_set_led_async(mos7840_port, 0x0301,
 869                                         MODEM_CONTROL_REGISTER);
 870                 mod_timer(&mos7840_port->led_timer1,
 871                                 jiffies + msecs_to_jiffies(LED_ON_MS));
 872         }
 873
 874         mos7840_port->read_urb_busy = true;
 875         retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
 876
 877         if (retval) {
 878                 dbg("usb_submit_urb(read bulk) failed, retval = %d", retval);
 879                 mos7840_port->read_urb_busy = false;
 880         }
 881 }
 882
 883 /*****************************************************************************
 884  * mos7840_bulk_out_data_callback
 885  *      this is the callback function for when we have finished sending
 886  *      serial data on the bulk out endpoint.
 887  *****************************************************************************/
 888
 889 static void mos7840_bulk_out_data_callback(struct urb *urb)
 890 {
 891         struct moschip_port *mos7840_port;
 892         struct tty_struct *tty;
 893         int status = urb->status;
 894         int i;
 895
 896         mos7840_port = urb->context;
 897         spin_lock(&mos7840_port->pool_lock);
 898         for (i = 0; i < NUM_URBS; i++) {
 899                 if (urb == mos7840_port->write_urb_pool[i]) {
 900                         mos7840_port->busy[i] = 0;
 901                         break;
 902                 }
 903         }
 904         spin_unlock(&mos7840_port->pool_lock);
 905
 906         if (status) {
 907                 dbg("nonzero write bulk status received:%d", status);
 908                 return;
 909         }
 910
 911         if (mos7840_port_paranoia_check(mos7840_port->port, __func__)) {
 912                 dbg("%s", "Port Paranoia failed");
 913                 return;
 914         }
 915
 916         tty = tty_port_tty_get(&mos7840_port->port->port);
 917         if (tty && mos7840_port->open)
 918                 tty_wakeup(tty);
 919         tty_kref_put(tty);
 920
 921 }
 922
 923 /************************************************************************/
 924 /*       D R I V E R  T T Y  I N T E R F A C E  F U N C T I O N S       */
 925 /************************************************************************/
 926 #ifdef MCSSerialProbe
 927 static int mos7840_serial_probe(struct usb_serial *serial,
 928                                 const struct usb_device_id *id)
 929 {
 930
 931         /*need to implement the mode_reg reading and updating\
 932            structures usb_serial_ device_type\
 933            (i.e num_ports, num_bulkin,bulkout etc) */
 934         /* Also we can update the changes  attach */
 935         return 1;
 936 }
 937 #endif
 938
 939 /*****************************************************************************
 940  * mos7840_open
 941  *      this function is called by the tty driver when a port is opened
 942  *      If successful, we return 0
 943  *      Otherwise we return a negative error number.
 944  *****************************************************************************/
 945
 946 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
 947 {
 948         int response;
 949         int j;
 950         struct usb_serial *serial;
 951         struct urb *urb;
 952         __u16 Data;
 953         int status;
 954         struct moschip_port *mos7840_port;
 955         struct moschip_port *port0;
 956
 957         if (mos7840_port_paranoia_check(port, __func__)) {
 958                 dbg("%s", "Port Paranoia failed");
 959                 return -ENODEV;
 960         }
 961
 962         serial = port->serial;
 963
 964         if (mos7840_serial_paranoia_check(serial, __func__)) {
 965                 dbg("%s", "Serial Paranoia failed");
 966                 return -ENODEV;
 967         }
 968
 969         mos7840_port = mos7840_get_port_private(port);
 970         port0 = mos7840_get_port_private(serial->port[0]);
 971
 972         if (mos7840_port == NULL || port0 == NULL)
 973                 return -ENODEV;
 974
 975         usb_clear_halt(serial->dev, port->write_urb->pipe);
 976         usb_clear_halt(serial->dev, port->read_urb->pipe);
 977         port0->open_ports++;
 978
 979         /* Initialising the write urb pool */
 980         for (j = 0; j < NUM_URBS; ++j) {
 981                 urb = usb_alloc_urb(0, GFP_KERNEL);
 982                 mos7840_port->write_urb_pool[j] = urb;
 983
 984                 if (urb == NULL) {
 985                         dev_err(&port->dev, "No more urbs???\n");
 986                         continue;
 987                 }
 988
 989                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
 990                                                                 GFP_KERNEL);
 991                 if (!urb->transfer_buffer) {
 992                         usb_free_urb(urb);
 993                         mos7840_port->write_urb_pool[j] = NULL;
 994                         dev_err(&port->dev,
 995                                 "%s-out of memory for urb buffers.\n",
 996                                 __func__);
 997                         continue;
 998                 }
 999         }
1000
1001 /*****************************************************************************
1002  * Initialize MCS7840 -- Write Init values to corresponding Registers
1003  *
1004  * Register Index
1005  * 1 : IER
1006  * 2 : FCR
1007  * 3 : LCR
1008  * 4 : MCR
1009  *
1010  * 0x08 : SP1/2 Control Reg
1011  *****************************************************************************/
1012
1013         /* NEED to check the following Block */
1014
1015         Data = 0x0;
1016         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
1017         if (status < 0) {
1018                 dbg("Reading Spreg failed");
1019                 return -1;
1020         }
1021         Data |= 0x80;
1022         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1023         if (status < 0) {
1024                 dbg("writing Spreg failed");
1025                 return -1;
1026         }
1027
1028         Data &= ~0x80;
1029         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1030         if (status < 0) {
1031                 dbg("writing Spreg failed");
1032                 return -1;
1033         }
1034         /* End of block to be checked */
1035
1036         Data = 0x0;
1037         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1038                                                                         &Data);
1039         if (status < 0) {
1040                 dbg("Reading Controlreg failed");
1041                 return -1;
1042         }
1043         Data |= 0x08;           /* Driver done bit */
1044         Data |= 0x20;           /* rx_disable */
1045         status = mos7840_set_reg_sync(port,
1046                                 mos7840_port->ControlRegOffset, Data);
1047         if (status < 0) {
1048                 dbg("writing Controlreg failed");
1049                 return -1;
1050         }
1051         /* do register settings here */
1052         /* Set all regs to the device default values. */
1053         /***********************************
1054          * First Disable all interrupts.
1055          ***********************************/
1056         Data = 0x00;
1057         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1058         if (status < 0) {
1059                 dbg("disabling interrupts failed");
1060                 return -1;
1061         }
1062         /* Set FIFO_CONTROL_REGISTER to the default value */
1063         Data = 0x00;
1064         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1065         if (status < 0) {
1066                 dbg("Writing FIFO_CONTROL_REGISTER  failed");
1067                 return -1;
1068         }
1069
1070         Data = 0xcf;
1071         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1072         if (status < 0) {
1073                 dbg("Writing FIFO_CONTROL_REGISTER  failed");
1074                 return -1;
1075         }
1076
1077         Data = 0x03;
1078         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1079         mos7840_port->shadowLCR = Data;
1080
1081         Data = 0x0b;
1082         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1083         mos7840_port->shadowMCR = Data;
1084
1085         Data = 0x00;
1086         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1087         mos7840_port->shadowLCR = Data;
1088
1089         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1090         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1091
1092         Data = 0x0c;
1093         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1094
1095         Data = 0x0;
1096         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1097
1098         Data = 0x00;
1099         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1100
1101         Data = Data & ~SERIAL_LCR_DLAB;
1102         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1103         mos7840_port->shadowLCR = Data;
1104
1105         /* clearing Bulkin and Bulkout Fifo */
1106         Data = 0x0;
1107         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
1108
1109         Data = Data | 0x0c;
1110         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1111
1112         Data = Data & ~0x0c;
1113         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1114         /* Finally enable all interrupts */
1115         Data = 0x0c;
1116         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1117
1118         /* clearing rx_disable */
1119         Data = 0x0;
1120         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1121                                                                         &Data);
1122         Data = Data & ~0x20;
1123         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1124                                                                         Data);
1125
1126         /* rx_negate */
1127         Data = 0x0;
1128         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1129                                                                         &Data);
1130         Data = Data | 0x10;
1131         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1132                                                                         Data);
1133
1134         /* Check to see if we've set up our endpoint info yet    *
1135          * (can't set it up in mos7840_startup as the structures *
1136          * were not set up at that time.)                        */
1137         if (port0->open_ports == 1) {
1138                 if (serial->port[0]->interrupt_in_buffer == NULL) {
1139                         /* set up interrupt urb */
1140                         usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1141                                 serial->dev,
1142                                 usb_rcvintpipe(serial->dev,
1143                                 serial->port[0]->interrupt_in_endpointAddress),
1144                                 serial->port[0]->interrupt_in_buffer,
1145                                 serial->port[0]->interrupt_in_urb->
1146                                 transfer_buffer_length,
1147                                 mos7840_interrupt_callback,
1148                                 serial,
1149                                 serial->port[0]->interrupt_in_urb->interval);
1150
1151                         /* start interrupt read for mos7840               *
1152                          * will continue as long as mos7840 is connected  */
1153
1154                         response =
1155                             usb_submit_urb(serial->port[0]->interrupt_in_urb,
1156                                            GFP_KERNEL);
1157                         if (response) {
1158                                 dev_err(&port->dev, "%s - Error %d submitting "
1159                                         "interrupt urb\n", __func__, response);
1160                         }
1161
1162                 }
1163
1164         }
1165
1166         /* see if we've set up our endpoint info yet   *
1167          * (can't set it up in mos7840_startup as the  *
1168          * structures were not set up at that time.)   */
1169
1170         dbg("port number is %d", port->number);
1171         dbg("serial number is %d", port->serial->minor);
1172         dbg("Bulkin endpoint is %d", port->bulk_in_endpointAddress);
1173         dbg("BulkOut endpoint is %d", port->bulk_out_endpointAddress);
1174         dbg("Interrupt endpoint is %d", port->interrupt_in_endpointAddress);
1175         dbg("port's number in the device is %d", mos7840_port->port_num);
1176         mos7840_port->read_urb = port->read_urb;
1177
1178         /* set up our bulk in urb */
1179         if ((serial->num_ports == 2)
1180                 && ((((__u16)port->number -
1181                         (__u16)(port->serial->minor)) % 2) != 0)) {
1182                 usb_fill_bulk_urb(mos7840_port->read_urb,
1183                         serial->dev,
1184                         usb_rcvbulkpipe(serial->dev,
1185                                 (port->bulk_in_endpointAddress) + 2),
1186                         port->bulk_in_buffer,
1187                         mos7840_port->read_urb->transfer_buffer_length,
1188                         mos7840_bulk_in_callback, mos7840_port);
1189         } else {
1190                 usb_fill_bulk_urb(mos7840_port->read_urb,
1191                         serial->dev,
1192                         usb_rcvbulkpipe(serial->dev,
1193                                 port->bulk_in_endpointAddress),
1194                         port->bulk_in_buffer,
1195                         mos7840_port->read_urb->transfer_buffer_length,
1196                         mos7840_bulk_in_callback, mos7840_port);
1197         }
1198
1199         dbg("mos7840_open: bulkin endpoint is %d",
1200             port->bulk_in_endpointAddress);
1201         mos7840_port->read_urb_busy = true;
1202         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1203         if (response) {
1204                 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1205                         __func__, response);
1206                 mos7840_port->read_urb_busy = false;
1207         }
1208
1209         /* initialize our wait queues */
1210         init_waitqueue_head(&mos7840_port->wait_chase);
1211         init_waitqueue_head(&mos7840_port->delta_msr_wait);
1212
1213         /* initialize our icount structure */
1214         memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1215
1216         /* initialize our port settings */
1217         /* Must set to enable ints! */
1218         mos7840_port->shadowMCR = MCR_MASTER_IE;
1219         /* send a open port command */
1220         mos7840_port->open = 1;
1221         /* mos7840_change_port_settings(mos7840_port,old_termios); */
1222         mos7840_port->icount.tx = 0;
1223         mos7840_port->icount.rx = 0;
1224
1225         dbg("usb_serial serial:%p       mos7840_port:%p\n      usb_serial_port port:%p",
1226                                 serial, mos7840_port, port);
1227
1228         return 0;
1229 }
1230
1231 /*****************************************************************************
1232  * mos7840_chars_in_buffer
1233  *      this function is called by the tty driver when it wants to know how many
1234  *      bytes of data we currently have outstanding in the port (data that has
1235  *      been written, but hasn't made it out the port yet)
1236  *      If successful, we return the number of bytes left to be written in the
1237  *      system,
1238  *      Otherwise we return zero.
1239  *****************************************************************************/
1240
1241 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1242 {
1243         struct usb_serial_port *port = tty->driver_data;
1244         int i;
1245         int chars = 0;
1246         unsigned long flags;
1247         struct moschip_port *mos7840_port;
1248
1249         if (mos7840_port_paranoia_check(port, __func__)) {
1250                 dbg("%s", "Invalid port");
1251                 return 0;
1252         }
1253
1254         mos7840_port = mos7840_get_port_private(port);
1255         if (mos7840_port == NULL)
1256                 return 0;
1257
1258         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1259         for (i = 0; i < NUM_URBS; ++i)
1260                 if (mos7840_port->busy[i])
1261                         chars += URB_TRANSFER_BUFFER_SIZE;
1262         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1263         dbg("%s - returns %d", __func__, chars);
1264         return chars;
1265
1266 }
1267
1268 /*****************************************************************************
1269  * mos7840_close
1270  *      this function is called by the tty driver when a port is closed
1271  *****************************************************************************/
1272
1273 static void mos7840_close(struct usb_serial_port *port)
1274 {
1275         struct usb_serial *serial;
1276         struct moschip_port *mos7840_port;
1277         struct moschip_port *port0;
1278         int j;
1279         __u16 Data;
1280
1281         if (mos7840_port_paranoia_check(port, __func__)) {
1282                 dbg("%s", "Port Paranoia failed");
1283                 return;
1284         }
1285
1286         serial = mos7840_get_usb_serial(port, __func__);
1287         if (!serial) {
1288                 dbg("%s", "Serial Paranoia failed");
1289                 return;
1290         }
1291
1292         mos7840_port = mos7840_get_port_private(port);
1293         port0 = mos7840_get_port_private(serial->port[0]);
1294
1295         if (mos7840_port == NULL || port0 == NULL)
1296                 return;
1297
1298         for (j = 0; j < NUM_URBS; ++j)
1299                 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1300
1301         /* Freeing Write URBs */
1302         for (j = 0; j < NUM_URBS; ++j) {
1303                 if (mos7840_port->write_urb_pool[j]) {
1304                         if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1305                                 kfree(mos7840_port->write_urb_pool[j]->
1306                                       transfer_buffer);
1307
1308                         usb_free_urb(mos7840_port->write_urb_pool[j]);
1309                 }
1310         }
1311
1312         /* While closing port, shutdown all bulk read, write  *
1313          * and interrupt read if they exists                  */
1314         if (serial->dev) {
1315                 if (mos7840_port->write_urb) {
1316                         dbg("%s", "Shutdown bulk write");
1317                         usb_kill_urb(mos7840_port->write_urb);
1318                 }
1319                 if (mos7840_port->read_urb) {
1320                         dbg("%s", "Shutdown bulk read");
1321                         usb_kill_urb(mos7840_port->read_urb);
1322                         mos7840_port->read_urb_busy = false;
1323                 }
1324                 if ((&mos7840_port->control_urb)) {
1325                         dbg("%s", "Shutdown control read");
1326                         /*/      usb_kill_urb (mos7840_port->control_urb); */
1327                 }
1328         }
1329 /*      if(mos7840_port->ctrl_buf != NULL) */
1330 /*              kfree(mos7840_port->ctrl_buf); */
1331         port0->open_ports--;
1332         dbg("mos7840_num_open_ports in close%d:in port%d",
1333             port0->open_ports, port->number);
1334         if (port0->open_ports == 0) {
1335                 if (serial->port[0]->interrupt_in_urb) {
1336                         dbg("%s", "Shutdown interrupt_in_urb");
1337                         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1338                 }
1339         }
1340
1341         if (mos7840_port->write_urb) {
1342                 /* if this urb had a transfer buffer already (old tx) free it */
1343                 if (mos7840_port->write_urb->transfer_buffer != NULL)
1344                         kfree(mos7840_port->write_urb->transfer_buffer);
1345                 usb_free_urb(mos7840_port->write_urb);
1346         }
1347
1348         Data = 0x0;
1349         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1350
1351         Data = 0x00;
1352         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1353
1354         mos7840_port->open = 0;
1355 }
1356
1357 /************************************************************************
1358  *
1359  * mos7840_block_until_chase_response
1360  *
1361  *      This function will block the close until one of the following:
1362  *              1. Response to our Chase comes from mos7840
1363  *              2. A timeout of 10 seconds without activity has expired
1364  *                 (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1365  *
1366  ************************************************************************/
1367
1368 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1369                                         struct moschip_port *mos7840_port)
1370 {
1371         int timeout = 1 * HZ;
1372         int wait = 10;
1373         int count;
1374
1375         while (1) {
1376                 count = mos7840_chars_in_buffer(tty);
1377
1378                 /* Check for Buffer status */
1379                 if (count <= 0)
1380                         return;
1381
1382                 /* Block the thread for a while */
1383                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1384                                                timeout);
1385                 /* No activity.. count down section */
1386                 wait--;
1387                 if (wait == 0) {
1388                         dbg("%s - TIMEOUT", __func__);
1389                         return;
1390                 } else {
1391                         /* Reset timeout value back to seconds */
1392                         wait = 10;
1393                 }
1394         }
1395
1396 }
1397
1398 /*****************************************************************************
1399  * mos7840_break
1400  *      this function sends a break to the port
1401  *****************************************************************************/
1402 static void mos7840_break(struct tty_struct *tty, int break_state)
1403 {
1404         struct usb_serial_port *port = tty->driver_data;
1405         unsigned char data;
1406         struct usb_serial *serial;
1407         struct moschip_port *mos7840_port;
1408
1409         if (mos7840_port_paranoia_check(port, __func__)) {
1410                 dbg("%s", "Port Paranoia failed");
1411                 return;
1412         }
1413
1414         serial = mos7840_get_usb_serial(port, __func__);
1415         if (!serial) {
1416                 dbg("%s", "Serial Paranoia failed");
1417                 return;
1418         }
1419
1420         mos7840_port = mos7840_get_port_private(port);
1421
1422         if (mos7840_port == NULL)
1423                 return;
1424
1425         if (serial->dev)
1426                 /* flush and block until tx is empty */
1427                 mos7840_block_until_chase_response(tty, mos7840_port);
1428
1429         if (break_state == -1)
1430                 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1431         else
1432                 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1433
1434         /* FIXME: no locking on shadowLCR anywhere in driver */
1435         mos7840_port->shadowLCR = data;
1436         dbg("mcs7840_break mos7840_port->shadowLCR is %x",
1437             mos7840_port->shadowLCR);
1438         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1439                              mos7840_port->shadowLCR);
1440 }
1441
1442 /*****************************************************************************
1443  * mos7840_write_room
1444  *      this function is called by the tty driver when it wants to know how many
1445  *      bytes of data we can accept for a specific port.
1446  *      If successful, we return the amount of room that we have for this port
1447  *      Otherwise we return a negative error number.
1448  *****************************************************************************/
1449
1450 static int mos7840_write_room(struct tty_struct *tty)
1451 {
1452         struct usb_serial_port *port = tty->driver_data;
1453         int i;
1454         int room = 0;
1455         unsigned long flags;
1456         struct moschip_port *mos7840_port;
1457
1458         if (mos7840_port_paranoia_check(port, __func__)) {
1459                 dbg("%s", "Invalid port");
1460                 dbg("%s", " mos7840_write_room:leaving ...........");
1461                 return -1;
1462         }
1463
1464         mos7840_port = mos7840_get_port_private(port);
1465         if (mos7840_port == NULL) {
1466                 dbg("%s", "mos7840_break:leaving ...........");
1467                 return -1;
1468         }
1469
1470         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1471         for (i = 0; i < NUM_URBS; ++i) {
1472                 if (!mos7840_port->busy[i])
1473                         room += URB_TRANSFER_BUFFER_SIZE;
1474         }
1475         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1476
1477         room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1478         dbg("%s - returns %d", __func__, room);
1479         return room;
1480
1481 }
1482
1483 /*****************************************************************************
1484  * mos7840_write
1485  *      this function is called by the tty driver when data should be written to
1486  *      the port.
1487  *      If successful, we return the number of bytes written, otherwise we
1488  *      return a negative error number.
1489  *****************************************************************************/
1490
1491 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1492                          const unsigned char *data, int count)
1493 {
1494         int status;
1495         int i;
1496         int bytes_sent = 0;
1497         int transfer_size;
1498         unsigned long flags;
1499
1500         struct moschip_port *mos7840_port;
1501         struct usb_serial *serial;
1502         struct urb *urb;
1503         /* __u16 Data; */
1504         const unsigned char *current_position = data;
1505         unsigned char *data1;
1506
1507 #ifdef NOTMOS7840
1508         Data = 0x00;
1509         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1510         mos7840_port->shadowLCR = Data;
1511         dbg("mos7840_write: LINE_CONTROL_REGISTER is %x", Data);
1512         dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1513             mos7840_port->shadowLCR);
1514
1515         /* Data = 0x03; */
1516         /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1517         /* mos7840_port->shadowLCR=Data;//Need to add later */
1518
1519         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1520         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1521
1522         /* Data = 0x0c; */
1523         /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1524         Data = 0x00;
1525         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1526         dbg("mos7840_write:DLL value is %x", Data);
1527
1528         Data = 0x0;
1529         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1530         dbg("mos7840_write:DLM value is %x", Data);
1531
1532         Data = Data & ~SERIAL_LCR_DLAB;
1533         dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1534             mos7840_port->shadowLCR);
1535         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1536 #endif
1537
1538         if (mos7840_port_paranoia_check(port, __func__)) {
1539                 dbg("%s", "Port Paranoia failed");
1540                 return -1;
1541         }
1542
1543         serial = port->serial;
1544         if (mos7840_serial_paranoia_check(serial, __func__)) {
1545                 dbg("%s", "Serial Paranoia failed");
1546                 return -1;
1547         }
1548
1549         mos7840_port = mos7840_get_port_private(port);
1550         if (mos7840_port == NULL) {
1551                 dbg("%s", "mos7840_port is NULL");
1552                 return -1;
1553         }
1554
1555         /* try to find a free urb in the list */
1556         urb = NULL;
1557
1558         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1559         for (i = 0; i < NUM_URBS; ++i) {
1560                 if (!mos7840_port->busy[i]) {
1561                         mos7840_port->busy[i] = 1;
1562                         urb = mos7840_port->write_urb_pool[i];
1563                         dbg("URB:%d", i);
1564                         break;
1565                 }
1566         }
1567         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1568
1569         if (urb == NULL) {
1570                 dbg("%s - no more free urbs", __func__);
1571                 goto exit;
1572         }
1573
1574         if (urb->transfer_buffer == NULL) {
1575                 urb->transfer_buffer =
1576                     kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1577
1578                 if (urb->transfer_buffer == NULL) {
1579                         dev_err_console(port, "%s no more kernel memory...\n",
1580                                 __func__);
1581                         goto exit;
1582                 }
1583         }
1584         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1585
1586         memcpy(urb->transfer_buffer, current_position, transfer_size);
1587
1588         /* fill urb with data and submit  */
1589         if ((serial->num_ports == 2)
1590                 && ((((__u16)port->number -
1591                         (__u16)(port->serial->minor)) % 2) != 0)) {
1592                 usb_fill_bulk_urb(urb,
1593                         serial->dev,
1594                         usb_sndbulkpipe(serial->dev,
1595                                 (port->bulk_out_endpointAddress) + 2),
1596                         urb->transfer_buffer,
1597                         transfer_size,
1598                         mos7840_bulk_out_data_callback, mos7840_port);
1599         } else {
1600                 usb_fill_bulk_urb(urb,
1601                         serial->dev,
1602                         usb_sndbulkpipe(serial->dev,
1603                                 port->bulk_out_endpointAddress),
1604                         urb->transfer_buffer,
1605                         transfer_size,
1606                         mos7840_bulk_out_data_callback, mos7840_port);
1607         }
1608
1609         data1 = urb->transfer_buffer;
1610         dbg("bulkout endpoint is %d", port->bulk_out_endpointAddress);
1611
1612         /* Turn on LED */
1613         if (mos7840_port->has_led && !mos7840_port->led_flag) {
1614                 mos7840_port->led_flag = true;
1615                 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0301);
1616                 mod_timer(&mos7840_port->led_timer1,
1617                                 jiffies + msecs_to_jiffies(LED_ON_MS));
1618         }
1619
1620         /* send it down the pipe */
1621         status = usb_submit_urb(urb, GFP_ATOMIC);
1622
1623         if (status) {
1624                 mos7840_port->busy[i] = 0;
1625                 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
1626                         "with status = %d\n", __func__, status);
1627                 bytes_sent = status;
1628                 goto exit;
1629         }
1630         bytes_sent = transfer_size;
1631         mos7840_port->icount.tx += transfer_size;
1632         smp_wmb();
1633         dbg("mos7840_port->icount.tx is %d:", mos7840_port->icount.tx);
1634 exit:
1635         return bytes_sent;
1636
1637 }
1638
1639 /*****************************************************************************
1640  * mos7840_throttle
1641  *      this function is called by the tty driver when it wants to stop the data
1642  *      being read from the port.
1643  *****************************************************************************/
1644
1645 static void mos7840_throttle(struct tty_struct *tty)
1646 {
1647         struct usb_serial_port *port = tty->driver_data;
1648         struct moschip_port *mos7840_port;
1649         int status;
1650
1651         if (mos7840_port_paranoia_check(port, __func__)) {
1652                 dbg("%s", "Invalid port");
1653                 return;
1654         }
1655
1656         dbg("- port %d", port->number);
1657
1658         mos7840_port = mos7840_get_port_private(port);
1659
1660         if (mos7840_port == NULL)
1661                 return;
1662
1663         if (!mos7840_port->open) {
1664                 dbg("%s", "port not opened");
1665                 return;
1666         }
1667
1668         /* if we are implementing XON/XOFF, send the stop character */
1669         if (I_IXOFF(tty)) {
1670                 unsigned char stop_char = STOP_CHAR(tty);
1671                 status = mos7840_write(tty, port, &stop_char, 1);
1672                 if (status <= 0)
1673                         return;
1674         }
1675         /* if we are implementing RTS/CTS, toggle that line */
1676         if (tty->termios->c_cflag & CRTSCTS) {
1677                 mos7840_port->shadowMCR &= ~MCR_RTS;
1678                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1679                                          mos7840_port->shadowMCR);
1680                 if (status < 0)
1681                         return;
1682         }
1683 }
1684
1685 /*****************************************************************************
1686  * mos7840_unthrottle
1687  *      this function is called by the tty driver when it wants to resume
1688  *      the data being read from the port (called after mos7840_throttle is
1689  *      called)
1690  *****************************************************************************/
1691 static void mos7840_unthrottle(struct tty_struct *tty)
1692 {
1693         struct usb_serial_port *port = tty->driver_data;
1694         int status;
1695         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1696
1697         if (mos7840_port_paranoia_check(port, __func__)) {
1698                 dbg("%s", "Invalid port");
1699                 return;
1700         }
1701
1702         if (mos7840_port == NULL)
1703                 return;
1704
1705         if (!mos7840_port->open) {
1706                 dbg("%s - port not opened", __func__);
1707                 return;
1708         }
1709
1710         /* if we are implementing XON/XOFF, send the start character */
1711         if (I_IXOFF(tty)) {
1712                 unsigned char start_char = START_CHAR(tty);
1713                 status = mos7840_write(tty, port, &start_char, 1);
1714                 if (status <= 0)
1715                         return;
1716         }
1717
1718         /* if we are implementing RTS/CTS, toggle that line */
1719         if (tty->termios->c_cflag & CRTSCTS) {
1720                 mos7840_port->shadowMCR |= MCR_RTS;
1721                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1722                                          mos7840_port->shadowMCR);
1723                 if (status < 0)
1724                         return;
1725         }
1726 }
1727
1728 static int mos7840_tiocmget(struct tty_struct *tty)
1729 {
1730         struct usb_serial_port *port = tty->driver_data;
1731         struct moschip_port *mos7840_port;
1732         unsigned int result;
1733         __u16 msr;
1734         __u16 mcr;
1735         int status;
1736         mos7840_port = mos7840_get_port_private(port);
1737
1738         if (mos7840_port == NULL)
1739                 return -ENODEV;
1740
1741         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1742         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1743         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1744             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1745             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1746             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1747             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1748             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1749             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1750
1751         dbg("%s - 0x%04X", __func__, result);
1752
1753         return result;
1754 }
1755
1756 static int mos7840_tiocmset(struct tty_struct *tty,
1757                             unsigned int set, unsigned int clear)
1758 {
1759         struct usb_serial_port *port = tty->driver_data;
1760         struct moschip_port *mos7840_port;
1761         unsigned int mcr;
1762         int status;
1763
1764         mos7840_port = mos7840_get_port_private(port);
1765
1766         if (mos7840_port == NULL)
1767                 return -ENODEV;
1768
1769         /* FIXME: What locks the port registers ? */
1770         mcr = mos7840_port->shadowMCR;
1771         if (clear & TIOCM_RTS)
1772                 mcr &= ~MCR_RTS;
1773         if (clear & TIOCM_DTR)
1774                 mcr &= ~MCR_DTR;
1775         if (clear & TIOCM_LOOP)
1776                 mcr &= ~MCR_LOOPBACK;
1777
1778         if (set & TIOCM_RTS)
1779                 mcr |= MCR_RTS;
1780         if (set & TIOCM_DTR)
1781                 mcr |= MCR_DTR;
1782         if (set & TIOCM_LOOP)
1783                 mcr |= MCR_LOOPBACK;
1784
1785         mos7840_port->shadowMCR = mcr;
1786
1787         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1788         if (status < 0) {
1789                 dbg("setting MODEM_CONTROL_REGISTER Failed");
1790                 return status;
1791         }
1792
1793         return 0;
1794 }
1795
1796 /*****************************************************************************
1797  * mos7840_calc_baud_rate_divisor
1798  *      this function calculates the proper baud rate divisor for the specified
1799  *      baud rate.
1800  *****************************************************************************/
1801 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1802                                           __u16 *clk_sel_val)
1803 {
1804         dbg("%s - %d", __func__, baudRate);
1805
1806         if (baudRate <= 115200) {
1807                 *divisor = 115200 / baudRate;
1808                 *clk_sel_val = 0x0;
1809         }
1810         if ((baudRate > 115200) && (baudRate <= 230400)) {
1811                 *divisor = 230400 / baudRate;
1812                 *clk_sel_val = 0x10;
1813         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1814                 *divisor = 403200 / baudRate;
1815                 *clk_sel_val = 0x20;
1816         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1817                 *divisor = 460800 / baudRate;
1818                 *clk_sel_val = 0x30;
1819         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1820                 *divisor = 806400 / baudRate;
1821                 *clk_sel_val = 0x40;
1822         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1823                 *divisor = 921600 / baudRate;
1824                 *clk_sel_val = 0x50;
1825         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1826                 *divisor = 1572864 / baudRate;
1827                 *clk_sel_val = 0x60;
1828         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1829                 *divisor = 3145728 / baudRate;
1830                 *clk_sel_val = 0x70;
1831         }
1832         return 0;
1833
1834 #ifdef NOTMCS7840
1835
1836         for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1837                 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1838                         *divisor = mos7840_divisor_table[i].Divisor;
1839                         return 0;
1840                 }
1841         }
1842
1843         /* After trying for all the standard baud rates    *
1844          * Try calculating the divisor for this baud rate  */
1845
1846         if (baudrate > 75 && baudrate < 230400) {
1847                 /* get the divisor */
1848                 custom = (__u16) (230400L / baudrate);
1849
1850                 /* Check for round off */
1851                 round1 = (__u16) (2304000L / baudrate);
1852                 round = (__u16) (round1 - (custom * 10));
1853                 if (round > 4)
1854                         custom++;
1855                 *divisor = custom;
1856
1857                 dbg(" Baud %d = %d", baudrate, custom);
1858                 return 0;
1859         }
1860
1861         dbg("%s", " Baud calculation Failed...");
1862         return -1;
1863 #endif
1864 }
1865
1866 /*****************************************************************************
1867  * mos7840_send_cmd_write_baud_rate
1868  *      this function sends the proper command to change the baud rate of the
1869  *      specified port.
1870  *****************************************************************************/
1871
1872 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1873                                             int baudRate)
1874 {
1875         int divisor = 0;
1876         int status;
1877         __u16 Data;
1878         unsigned char number;
1879         __u16 clk_sel_val;
1880         struct usb_serial_port *port;
1881
1882         if (mos7840_port == NULL)
1883                 return -1;
1884
1885         port = (struct usb_serial_port *)mos7840_port->port;
1886         if (mos7840_port_paranoia_check(port, __func__)) {
1887                 dbg("%s", "Invalid port");
1888                 return -1;
1889         }
1890
1891         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1892                 dbg("%s", "Invalid Serial");
1893                 return -1;
1894         }
1895
1896         number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1897
1898         dbg("%s - port = %d, baud = %d", __func__,
1899             mos7840_port->port->number, baudRate);
1900         /* reset clk_uart_sel in spregOffset */
1901         if (baudRate > 115200) {
1902 #ifdef HW_flow_control
1903                 /* NOTE: need to see the pther register to modify */
1904                 /* setting h/w flow control bit to 1 */
1905                 Data = 0x2b;
1906                 mos7840_port->shadowMCR = Data;
1907                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1908                                                                         Data);
1909                 if (status < 0) {
1910                         dbg("Writing spreg failed in set_serial_baud");
1911                         return -1;
1912                 }
1913 #endif
1914
1915         } else {
1916 #ifdef HW_flow_control
1917                 /* setting h/w flow control bit to 0 */
1918                 Data = 0xb;
1919                 mos7840_port->shadowMCR = Data;
1920                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1921                                                                         Data);
1922                 if (status < 0) {
1923                         dbg("Writing spreg failed in set_serial_baud");
1924                         return -1;
1925                 }
1926 #endif
1927
1928         }
1929
1930         if (1) {                /* baudRate <= 115200) */
1931                 clk_sel_val = 0x0;
1932                 Data = 0x0;
1933                 status = mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1934                                                    &clk_sel_val);
1935                 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1936                                                                  &Data);
1937                 if (status < 0) {
1938                         dbg("reading spreg failed in set_serial_baud");
1939                         return -1;
1940                 }
1941                 Data = (Data & 0x8f) | clk_sel_val;
1942                 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1943                                                                 Data);
1944                 if (status < 0) {
1945                         dbg("Writing spreg failed in set_serial_baud");
1946                         return -1;
1947                 }
1948                 /* Calculate the Divisor */
1949
1950                 if (status) {
1951                         dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1952                         return status;
1953                 }
1954                 /* Enable access to divisor latch */
1955                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1956                 mos7840_port->shadowLCR = Data;
1957                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1958
1959                 /* Write the divisor */
1960                 Data = (unsigned char)(divisor & 0xff);
1961                 dbg("set_serial_baud Value to write DLL is %x", Data);
1962                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1963
1964                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1965                 dbg("set_serial_baud Value to write DLM is %x", Data);
1966                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1967
1968                 /* Disable access to divisor latch */
1969                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1970                 mos7840_port->shadowLCR = Data;
1971                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1972
1973         }
1974         return status;
1975 }
1976
1977 /*****************************************************************************
1978  * mos7840_change_port_settings
1979  *      This routine is called to set the UART on the device to match
1980  *      the specified new settings.
1981  *****************************************************************************/
1982
1983 static void mos7840_change_port_settings(struct tty_struct *tty,
1984         struct moschip_port *mos7840_port, struct ktermios *old_termios)
1985 {
1986         int baud;
1987         unsigned cflag;
1988         unsigned iflag;
1989         __u8 lData;
1990         __u8 lParity;
1991         __u8 lStop;
1992         int status;
1993         __u16 Data;
1994         struct usb_serial_port *port;
1995         struct usb_serial *serial;
1996
1997         if (mos7840_port == NULL)
1998                 return;
1999
2000         port = (struct usb_serial_port *)mos7840_port->port;
2001
2002         if (mos7840_port_paranoia_check(port, __func__)) {
2003                 dbg("%s", "Invalid port");
2004                 return;
2005         }
2006
2007         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
2008                 dbg("%s", "Invalid Serial");
2009                 return;
2010         }
2011
2012         serial = port->serial;
2013
2014         dbg("%s - port %d", __func__, mos7840_port->port->number);
2015
2016         if (!mos7840_port->open) {
2017                 dbg("%s - port not opened", __func__);
2018                 return;
2019         }
2020
2021         lData = LCR_BITS_8;
2022         lStop = LCR_STOP_1;
2023         lParity = LCR_PAR_NONE;
2024
2025         cflag = tty->termios->c_cflag;
2026         iflag = tty->termios->c_iflag;
2027
2028         /* Change the number of bits */
2029         if (cflag & CSIZE) {
2030                 switch (cflag & CSIZE) {
2031                 case CS5:
2032                         lData = LCR_BITS_5;
2033                         break;
2034
2035                 case CS6:
2036                         lData = LCR_BITS_6;
2037                         break;
2038
2039                 case CS7:
2040                         lData = LCR_BITS_7;
2041                         break;
2042                 default:
2043                 case CS8:
2044                         lData = LCR_BITS_8;
2045                         break;
2046                 }
2047         }
2048         /* Change the Parity bit */
2049         if (cflag & PARENB) {
2050                 if (cflag & PARODD) {
2051                         lParity = LCR_PAR_ODD;
2052                         dbg("%s - parity = odd", __func__);
2053                 } else {
2054                         lParity = LCR_PAR_EVEN;
2055                         dbg("%s - parity = even", __func__);
2056                 }
2057
2058         } else {
2059                 dbg("%s - parity = none", __func__);
2060         }
2061
2062         if (cflag & CMSPAR)
2063                 lParity = lParity | 0x20;
2064
2065         /* Change the Stop bit */
2066         if (cflag & CSTOPB) {
2067                 lStop = LCR_STOP_2;
2068                 dbg("%s - stop bits = 2", __func__);
2069         } else {
2070                 lStop = LCR_STOP_1;
2071                 dbg("%s - stop bits = 1", __func__);
2072         }
2073
2074         /* Update the LCR with the correct value */
2075         mos7840_port->shadowLCR &=
2076             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
2077         mos7840_port->shadowLCR |= (lData | lParity | lStop);
2078
2079         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x",
2080             mos7840_port->shadowLCR);
2081         /* Disable Interrupts */
2082         Data = 0x00;
2083         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2084
2085         Data = 0x00;
2086         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2087
2088         Data = 0xcf;
2089         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2090
2091         /* Send the updated LCR value to the mos7840 */
2092         Data = mos7840_port->shadowLCR;
2093
2094         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
2095
2096         Data = 0x00b;
2097         mos7840_port->shadowMCR = Data;
2098         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2099         Data = 0x00b;
2100         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2101
2102         /* set up the MCR register and send it to the mos7840 */
2103
2104         mos7840_port->shadowMCR = MCR_MASTER_IE;
2105         if (cflag & CBAUD)
2106                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
2107
2108         if (cflag & CRTSCTS)
2109                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
2110         else
2111                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
2112
2113         Data = mos7840_port->shadowMCR;
2114         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2115
2116         /* Determine divisor based on baud rate */
2117         baud = tty_get_baud_rate(tty);
2118
2119         if (!baud) {
2120                 /* pick a default, any default... */
2121                 dbg("%s", "Picked default baud...");
2122                 baud = 9600;
2123         }
2124
2125         dbg("%s - baud rate = %d", __func__, baud);
2126         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2127
2128         /* Enable Interrupts */
2129         Data = 0x0c;
2130         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2131
2132         if (mos7840_port->read_urb_busy == false) {
2133                 mos7840_port->read_urb_busy = true;
2134                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2135                 if (status) {
2136                         dbg("usb_submit_urb(read bulk) failed, status = %d",
2137                             status);
2138                         mos7840_port->read_urb_busy = false;
2139                 }
2140         }
2141         wake_up(&mos7840_port->delta_msr_wait);
2142         mos7840_port->delta_msr_cond = 1;
2143         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x",
2144             mos7840_port->shadowLCR);
2145 }
2146
2147 /*****************************************************************************
2148  * mos7840_set_termios
2149  *      this function is called by the tty driver when it wants to change
2150  *      the termios structure
2151  *****************************************************************************/
2152
2153 static void mos7840_set_termios(struct tty_struct *tty,
2154                                 struct usb_serial_port *port,
2155                                 struct ktermios *old_termios)
2156 {
2157         int status;
2158         unsigned int cflag;
2159         struct usb_serial *serial;
2160         struct moschip_port *mos7840_port;
2161
2162         if (mos7840_port_paranoia_check(port, __func__)) {
2163                 dbg("%s", "Invalid port");
2164                 return;
2165         }
2166
2167         serial = port->serial;
2168
2169         if (mos7840_serial_paranoia_check(serial, __func__)) {
2170                 dbg("%s", "Invalid Serial");
2171                 return;
2172         }
2173
2174         mos7840_port = mos7840_get_port_private(port);
2175
2176         if (mos7840_port == NULL)
2177                 return;
2178
2179         if (!mos7840_port->open) {
2180                 dbg("%s - port not opened", __func__);
2181                 return;
2182         }
2183
2184         dbg("%s", "setting termios - ");
2185
2186         cflag = tty->termios->c_cflag;
2187
2188         dbg("%s - clfag %08x iflag %08x", __func__,
2189             tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2190         dbg("%s - old clfag %08x old iflag %08x", __func__,
2191             old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2192         dbg("%s - port %d", __func__, port->number);
2193
2194         /* change the port settings to the new ones specified */
2195
2196         mos7840_change_port_settings(tty, mos7840_port, old_termios);
2197
2198         if (!mos7840_port->read_urb) {
2199                 dbg("%s", "URB KILLED !!!!!");
2200                 return;
2201         }
2202
2203         if (mos7840_port->read_urb_busy == false) {
2204                 mos7840_port->read_urb_busy = true;
2205                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2206                 if (status) {
2207                         dbg("usb_submit_urb(read bulk) failed, status = %d",
2208                             status);
2209                         mos7840_port->read_urb_busy = false;
2210                 }
2211         }
2212 }
2213
2214 /*****************************************************************************
2215  * mos7840_get_lsr_info - get line status register info
2216  *
2217  * Purpose: Let user call ioctl() to get info when the UART physically
2218  *          is emptied.  On bus types like RS485, the transmitter must
2219  *          release the bus after transmitting. This must be done when
2220  *          the transmit shift register is empty, not be done when the
2221  *          transmit holding register is empty.  This functionality
2222  *          allows an RS485 driver to be written in user space.
2223  *****************************************************************************/
2224
2225 static int mos7840_get_lsr_info(struct tty_struct *tty,
2226                                 unsigned int __user *value)
2227 {
2228         int count;
2229         unsigned int result = 0;
2230
2231         count = mos7840_chars_in_buffer(tty);
2232         if (count == 0) {
2233                 dbg("%s -- Empty", __func__);
2234                 result = TIOCSER_TEMT;
2235         }
2236
2237         if (copy_to_user(value, &result, sizeof(int)))
2238                 return -EFAULT;
2239         return 0;
2240 }
2241
2242 /*****************************************************************************
2243  * mos7840_get_serial_info
2244  *      function to get information about serial port
2245  *****************************************************************************/
2246
2247 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2248                                    struct serial_struct __user *retinfo)
2249 {
2250         struct serial_struct tmp;
2251
2252         if (mos7840_port == NULL)
2253                 return -1;
2254
2255         if (!retinfo)
2256                 return -EFAULT;
2257
2258         memset(&tmp, 0, sizeof(tmp));
2259
2260         tmp.type = PORT_16550A;
2261         tmp.line = mos7840_port->port->serial->minor;
2262         tmp.port = mos7840_port->port->number;
2263         tmp.irq = 0;
2264         tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2265         tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2266         tmp.baud_base = 9600;
2267         tmp.close_delay = 5 * HZ;
2268         tmp.closing_wait = 30 * HZ;
2269
2270         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2271                 return -EFAULT;
2272         return 0;
2273 }
2274
2275 static int mos7840_get_icount(struct tty_struct *tty,
2276                         struct serial_icounter_struct *icount)
2277 {
2278         struct usb_serial_port *port = tty->driver_data;
2279         struct moschip_port *mos7840_port;
2280         struct async_icount cnow;
2281
2282         mos7840_port = mos7840_get_port_private(port);
2283         cnow = mos7840_port->icount;
2284
2285         smp_rmb();
2286         icount->cts = cnow.cts;
2287         icount->dsr = cnow.dsr;
2288         icount->rng = cnow.rng;
2289         icount->dcd = cnow.dcd;
2290         icount->rx = cnow.rx;
2291         icount->tx = cnow.tx;
2292         icount->frame = cnow.frame;
2293         icount->overrun = cnow.overrun;
2294         icount->parity = cnow.parity;
2295         icount->brk = cnow.brk;
2296         icount->buf_overrun = cnow.buf_overrun;
2297
2298         dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
2299                 port->number, icount->rx, icount->tx);
2300         return 0;
2301 }
2302
2303 /*****************************************************************************
2304  * SerialIoctl
2305  *      this function handles any ioctl calls to the driver
2306  *****************************************************************************/
2307
2308 static int mos7840_ioctl(struct tty_struct *tty,
2309                          unsigned int cmd, unsigned long arg)
2310 {
2311         struct usb_serial_port *port = tty->driver_data;
2312         void __user *argp = (void __user *)arg;
2313         struct moschip_port *mos7840_port;
2314
2315         struct async_icount cnow;
2316         struct async_icount cprev;
2317
2318         if (mos7840_port_paranoia_check(port, __func__)) {
2319                 dbg("%s", "Invalid port");
2320                 return -1;
2321         }
2322
2323         mos7840_port = mos7840_get_port_private(port);
2324
2325         if (mos7840_port == NULL)
2326                 return -1;
2327
2328         dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
2329
2330         switch (cmd) {
2331                 /* return number of bytes available */
2332
2333         case TIOCSERGETLSR:
2334                 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
2335                 return mos7840_get_lsr_info(tty, argp);
2336
2337         case TIOCGSERIAL:
2338                 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
2339                 return mos7840_get_serial_info(mos7840_port, argp);
2340
2341         case TIOCSSERIAL:
2342                 dbg("%s (%d) TIOCSSERIAL", __func__, port->number);
2343                 break;
2344
2345         case TIOCMIWAIT:
2346                 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
2347                 cprev = mos7840_port->icount;
2348                 while (1) {
2349                         /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2350                         mos7840_port->delta_msr_cond = 0;
2351                         wait_event_interruptible(mos7840_port->delta_msr_wait,
2352                                                  (mos7840_port->
2353                                                   delta_msr_cond == 1));
2354
2355                         /* see if a signal did it */
2356                         if (signal_pending(current))
2357                                 return -ERESTARTSYS;
2358                         cnow = mos7840_port->icount;
2359                         smp_rmb();
2360                         if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2361                             cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2362                                 return -EIO;    /* no change => error */
2363                         if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2364                             ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2365                             ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2366                             ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2367                                 return 0;
2368                         }
2369                         cprev = cnow;
2370                 }
2371                 /* NOTREACHED */
2372                 break;
2373
2374         default:
2375                 break;
2376         }
2377         return -ENOIOCTLCMD;
2378 }
2379
2380 static int mos7810_check(struct usb_serial *serial)
2381 {
2382         int i, pass_count = 0;
2383         __u16 data = 0, mcr_data = 0;
2384         __u16 test_pattern = 0x55AA;
2385
2386         /* Store MCR setting */
2387         usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2388                 MCS_RDREQ, MCS_RD_RTYPE, 0x0300, MODEM_CONTROL_REGISTER,
2389                 &mcr_data, VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2390
2391         for (i = 0; i < 16; i++) {
2392                 /* Send the 1-bit test pattern out to MCS7810 test pin */
2393                 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2394                         MCS_WRREQ, MCS_WR_RTYPE,
2395                         (0x0300 | (((test_pattern >> i) & 0x0001) << 1)),
2396                         MODEM_CONTROL_REGISTER, NULL, 0, MOS_WDR_TIMEOUT);
2397
2398                 /* Read the test pattern back */
2399                 usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2400                         MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, &data,
2401                         VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2402
2403                 /* If this is a MCS7810 device, both test patterns must match */
2404                 if (((test_pattern >> i) ^ (~data >> 1)) & 0x0001)
2405                         break;
2406
2407                 pass_count++;
2408         }
2409
2410         /* Restore MCR setting */
2411         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), MCS_WRREQ,
2412                 MCS_WR_RTYPE, 0x0300 | mcr_data, MODEM_CONTROL_REGISTER, NULL,
2413                 0, MOS_WDR_TIMEOUT);
2414
2415         if (pass_count == 16)
2416                 return 1;
2417
2418         return 0;
2419 }
2420
2421 static int mos7840_calc_num_ports(struct usb_serial *serial)
2422 {
2423         __u16 data = 0x00;
2424         int mos7840_num_ports;
2425
2426         usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2427                 MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, &data,
2428                 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2429
2430         if (serial->dev->descriptor.idProduct == MOSCHIP_DEVICE_ID_7810 ||
2431                 serial->dev->descriptor.idProduct == MOSCHIP_DEVICE_ID_7820) {
2432                 device_type = serial->dev->descriptor.idProduct;
2433         } else {
2434                 /* For a MCS7840 device GPIO0 must be set to 1 */
2435                 if ((data & 0x01) == 1)
2436                         device_type = MOSCHIP_DEVICE_ID_7840;
2437                 else if (mos7810_check(serial))
2438                         device_type = MOSCHIP_DEVICE_ID_7810;
2439                 else
2440                         device_type = MOSCHIP_DEVICE_ID_7820;
2441         }
2442
2443         mos7840_num_ports = (device_type >> 4) & 0x000F;
2444         serial->num_bulk_in = mos7840_num_ports;
2445         serial->num_bulk_out = mos7840_num_ports;
2446         serial->num_ports = mos7840_num_ports;
2447
2448         return mos7840_num_ports;
2449 }
2450
2451 /****************************************************************************
2452  * mos7840_startup
2453  ****************************************************************************/
2454
2455 static int mos7840_startup(struct usb_serial *serial)
2456 {
2457         struct moschip_port *mos7840_port;
2458         struct usb_device *dev;
2459         int i, status;
2460         __u16 Data;
2461
2462         if (!serial) {
2463                 dbg("%s", "Invalid Handler");
2464                 return -1;
2465         }
2466
2467         dev = serial->dev;
2468
2469         /* we set up the pointers to the endpoints in the mos7840_open *
2470          * function, as the structures aren't created yet.             */
2471
2472         /* set up port private structures */
2473         for (i = 0; i < serial->num_ports; ++i) {
2474                 dbg ("mos7840_startup: configuring port %d............", i);
2475                 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2476                 if (mos7840_port == NULL) {
2477                         dev_err(&dev->dev, "%s - Out of memory\n", __func__);
2478                         status = -ENOMEM;
2479                         i--; /* don't follow NULL pointer cleaning up */
2480                         goto error;
2481                 }
2482
2483                 /* Initialize all port interrupt end point to port 0 int
2484                  * endpoint. Our device has only one interrupt end point
2485                  * common to all port */
2486
2487                 mos7840_port->port = serial->port[i];
2488                 mos7840_set_port_private(serial->port[i], mos7840_port);
2489                 spin_lock_init(&mos7840_port->pool_lock);
2490
2491                 /* minor is not initialised until later by
2492                  * usb-serial.c:get_free_serial() and cannot therefore be used
2493                  * to index device instances */
2494                 mos7840_port->port_num = i + 1;
2495                 dbg ("serial->port[i]->number = %d", serial->port[i]->number);
2496                 dbg ("serial->port[i]->serial->minor = %d", serial->port[i]->serial->minor);
2497                 dbg ("mos7840_port->port_num = %d", mos7840_port->port_num);
2498                 dbg ("serial->minor = %d", serial->minor);
2499
2500                 if (mos7840_port->port_num == 1) {
2501                         mos7840_port->SpRegOffset = 0x0;
2502                         mos7840_port->ControlRegOffset = 0x1;
2503                         mos7840_port->DcrRegOffset = 0x4;
2504                 } else if ((mos7840_port->port_num == 2)
2505                            && (serial->num_ports == 4)) {
2506                         mos7840_port->SpRegOffset = 0x8;
2507                         mos7840_port->ControlRegOffset = 0x9;
2508                         mos7840_port->DcrRegOffset = 0x16;
2509                 } else if ((mos7840_port->port_num == 2)
2510                            && (serial->num_ports == 2)) {
2511                         mos7840_port->SpRegOffset = 0xa;
2512                         mos7840_port->ControlRegOffset = 0xb;
2513                         mos7840_port->DcrRegOffset = 0x19;
2514                 } else if ((mos7840_port->port_num == 3)
2515                            && (serial->num_ports == 4)) {
2516                         mos7840_port->SpRegOffset = 0xa;
2517                         mos7840_port->ControlRegOffset = 0xb;
2518                         mos7840_port->DcrRegOffset = 0x19;
2519                 } else if ((mos7840_port->port_num == 4)
2520                            && (serial->num_ports == 4)) {
2521                         mos7840_port->SpRegOffset = 0xc;
2522                         mos7840_port->ControlRegOffset = 0xd;
2523                         mos7840_port->DcrRegOffset = 0x1c;
2524                 }
2525                 mos7840_dump_serial_port(mos7840_port);
2526                 mos7840_set_port_private(serial->port[i], mos7840_port);
2527
2528                 /* enable rx_disable bit in control register */
2529                 status = mos7840_get_reg_sync(serial->port[i],
2530                                  mos7840_port->ControlRegOffset, &Data);
2531                 if (status < 0) {
2532                         dbg("Reading ControlReg failed status-0x%x", status);
2533                         break;
2534                 } else
2535                         dbg("ControlReg Reading success val is %x, status%d",
2536                             Data, status);
2537                 Data |= 0x08;   /* setting driver done bit */
2538                 Data |= 0x04;   /* sp1_bit to have cts change reflect in
2539                                    modem status reg */
2540
2541                 /* Data |= 0x20; //rx_disable bit */
2542                 status = mos7840_set_reg_sync(serial->port[i],
2543                                          mos7840_port->ControlRegOffset, Data);
2544                 if (status < 0) {
2545                         dbg("Writing ControlReg failed(rx_disable) status-0x%x", status);
2546                         break;
2547                 } else
2548                         dbg("ControlReg Writing success(rx_disable) status%d",
2549                             status);
2550
2551                 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2552                    and 0x24 in DCR3 */
2553                 Data = 0x01;
2554                 status = mos7840_set_reg_sync(serial->port[i],
2555                          (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2556                 if (status < 0) {
2557                         dbg("Writing DCR0 failed status-0x%x", status);
2558                         break;
2559                 } else
2560                         dbg("DCR0 Writing success status%d", status);
2561
2562                 Data = 0x05;
2563                 status = mos7840_set_reg_sync(serial->port[i],
2564                          (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2565                 if (status < 0) {
2566                         dbg("Writing DCR1 failed status-0x%x", status);
2567                         break;
2568                 } else
2569                         dbg("DCR1 Writing success status%d", status);
2570
2571                 Data = 0x24;
2572                 status = mos7840_set_reg_sync(serial->port[i],
2573                          (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2574                 if (status < 0) {
2575                         dbg("Writing DCR2 failed status-0x%x", status);
2576                         break;
2577                 } else
2578                         dbg("DCR2 Writing success status%d", status);
2579
2580                 /* write values in clkstart0x0 and clkmulti 0x20 */
2581                 Data = 0x0;
2582                 status = mos7840_set_reg_sync(serial->port[i],
2583                                          CLK_START_VALUE_REGISTER, Data);
2584                 if (status < 0) {
2585                         dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x", status);
2586                         break;
2587                 } else
2588                         dbg("CLK_START_VALUE_REGISTER Writing success status%d", status);
2589
2590                 Data = 0x20;
2591                 status = mos7840_set_reg_sync(serial->port[i],
2592                                         CLK_MULTI_REGISTER, Data);
2593                 if (status < 0) {
2594                         dbg("Writing CLK_MULTI_REGISTER failed status-0x%x",
2595                             status);
2596                         goto error;
2597                 } else
2598                         dbg("CLK_MULTI_REGISTER Writing success status%d",
2599                             status);
2600
2601                 /* write value 0x0 to scratchpad register */
2602                 Data = 0x00;
2603                 status = mos7840_set_uart_reg(serial->port[i],
2604                                                 SCRATCH_PAD_REGISTER, Data);
2605                 if (status < 0) {
2606                         dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x",
2607                             status);
2608                         break;
2609                 } else
2610                         dbg("SCRATCH_PAD_REGISTER Writing success status%d",
2611                             status);
2612
2613                 /* Zero Length flag register */
2614                 if ((mos7840_port->port_num != 1)
2615                     && (serial->num_ports == 2)) {
2616
2617                         Data = 0xff;
2618                         status = mos7840_set_reg_sync(serial->port[i],
2619                                       (__u16) (ZLP_REG1 +
2620                                       ((__u16)mos7840_port->port_num)), Data);
2621                         dbg("ZLIP offset %x",
2622                             (__u16) (ZLP_REG1 +
2623                                         ((__u16) mos7840_port->port_num)));
2624                         if (status < 0) {
2625                                 dbg("Writing ZLP_REG%d failed status-0x%x",
2626                                     i + 2, status);
2627                                 break;
2628                         } else
2629                                 dbg("ZLP_REG%d Writing success status%d",
2630                                     i + 2, status);
2631                 } else {
2632                         Data = 0xff;
2633                         status = mos7840_set_reg_sync(serial->port[i],
2634                               (__u16) (ZLP_REG1 +
2635                               ((__u16)mos7840_port->port_num) - 0x1), Data);
2636                         dbg("ZLIP offset %x",
2637                             (__u16) (ZLP_REG1 +
2638                                      ((__u16) mos7840_port->port_num) - 0x1));
2639                         if (status < 0) {
2640                                 dbg("Writing ZLP_REG%d failed status-0x%x",
2641                                     i + 1, status);
2642                                 break;
2643                         } else
2644                                 dbg("ZLP_REG%d Writing success status%d",
2645                                     i + 1, status);
2646
2647                 }
2648                 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2649                 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2650                 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2651                                                                 GFP_KERNEL);
2652                 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2653                                                         !mos7840_port->dr) {
2654                         status = -ENOMEM;
2655                         goto error;
2656                 }
2657
2658                 mos7840_port->has_led = false;
2659
2660                 /* Initialize LED timers */
2661                 if (device_type == MOSCHIP_DEVICE_ID_7810) {
2662                         mos7840_port->has_led = true;
2663
2664                         init_timer(&mos7840_port->led_timer1);
2665                         mos7840_port->led_timer1.function = mos7840_led_off;
2666                         mos7840_port->led_timer1.expires =
2667                                         jiffies + msecs_to_jiffies(LED_ON_MS);
2668                         mos7840_port->led_timer1.data =
2669                                                 (unsigned long)mos7840_port;
2670
2671                         init_timer(&mos7840_port->led_timer2);
2672                         mos7840_port->led_timer2.function =
2673                                                 mos7840_led_flag_off;
2674                         mos7840_port->led_timer2.expires =
2675                                         jiffies + msecs_to_jiffies(LED_OFF_MS);
2676                         mos7840_port->led_timer2.data =
2677                                                 (unsigned long)mos7840_port;
2678
2679                         mos7840_port->led_flag = false;
2680
2681                         /* Turn off LED */
2682                         mos7840_set_led_sync(serial->port[i],
2683                                                 MODEM_CONTROL_REGISTER, 0x0300);
2684                 }
2685         }
2686         dbg ("mos7840_startup: all ports configured...........");
2687
2688         /* Zero Length flag enable */
2689         Data = 0x0f;
2690         status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2691         if (status < 0) {
2692                 dbg("Writing ZLP_REG5 failed status-0x%x", status);
2693                 goto error;
2694         } else
2695                 dbg("ZLP_REG5 Writing success status%d", status);
2696
2697         /* setting configuration feature to one */
2698         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2699                         (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
2700         return 0;
2701 error:
2702         for (/* nothing */; i >= 0; i--) {
2703                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2704
2705                 kfree(mos7840_port->dr);
2706                 kfree(mos7840_port->ctrl_buf);
2707                 usb_free_urb(mos7840_port->control_urb);
2708                 kfree(mos7840_port);
2709                 serial->port[i] = NULL;
2710         }
2711         return status;
2712 }
2713
2714 /****************************************************************************
2715  * mos7840_disconnect
2716  *      This function is called whenever the device is removed from the usb bus.
2717  ****************************************************************************/
2718
2719 static void mos7840_disconnect(struct usb_serial *serial)
2720 {
2721         int i;
2722         unsigned long flags;
2723         struct moschip_port *mos7840_port;
2724
2725         if (!serial) {
2726                 dbg("%s", "Invalid Handler");
2727                 return;
2728         }
2729
2730         /* check for the ports to be closed,close the ports and disconnect */
2731
2732         /* free private structure allocated for serial port  *
2733          * stop reads and writes on all ports                */
2734
2735         for (i = 0; i < serial->num_ports; ++i) {
2736                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2737                 dbg ("mos7840_port %d = %p", i, mos7840_port);
2738                 if (mos7840_port) {
2739                         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
2740                         mos7840_port->zombie = 1;
2741                         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
2742                         usb_kill_urb(mos7840_port->control_urb);
2743                 }
2744         }
2745 }
2746
2747 /****************************************************************************
2748  * mos7840_release
2749  *      This function is called when the usb_serial structure is freed.
2750  ****************************************************************************/
2751
2752 static void mos7840_release(struct usb_serial *serial)
2753 {
2754         int i;
2755         struct moschip_port *mos7840_port;
2756
2757         if (!serial) {
2758                 dbg("%s", "Invalid Handler");
2759                 return;
2760         }
2761
2762         /* check for the ports to be closed,close the ports and disconnect */
2763
2764         /* free private structure allocated for serial port  *
2765          * stop reads and writes on all ports                */
2766
2767         for (i = 0; i < serial->num_ports; ++i) {
2768                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2769                 dbg("mos7840_port %d = %p", i, mos7840_port);
2770                 if (mos7840_port) {
2771                         if (mos7840_port->has_led) {
2772                                 /* Turn off LED */
2773                                 mos7840_set_led_sync(mos7840_port->port,
2774                                                 MODEM_CONTROL_REGISTER, 0x0300);
2775
2776                                 del_timer_sync(&mos7840_port->led_timer1);
2777                                 del_timer_sync(&mos7840_port->led_timer2);
2778                         }
2779                         kfree(mos7840_port->ctrl_buf);
2780                         kfree(mos7840_port->dr);
2781                         kfree(mos7840_port);
2782                 }
2783         }
2784 }
2785
2786 static struct usb_driver io_driver = {
2787         .name = "mos7840",
2788         .disconnect = usb_serial_disconnect,
2789         .id_table = moschip_id_table_combined,
2790 };
2791
2792 static struct usb_serial_driver moschip7840_4port_device = {
2793         .driver = {
2794                    .owner = THIS_MODULE,
2795                    .name = "mos7840",
2796                    },
2797         .description = DRIVER_DESC,
2798         .id_table = moschip_port_id_table,
2799         .num_ports = 4,
2800         .open = mos7840_open,
2801         .close = mos7840_close,
2802         .write = mos7840_write,
2803         .write_room = mos7840_write_room,
2804         .chars_in_buffer = mos7840_chars_in_buffer,
2805         .throttle = mos7840_throttle,
2806         .unthrottle = mos7840_unthrottle,
2807         .calc_num_ports = mos7840_calc_num_ports,
2808 #ifdef MCSSerialProbe
2809         .probe = mos7840_serial_probe,
2810 #endif
2811         .ioctl = mos7840_ioctl,
2812         .set_termios = mos7840_set_termios,
2813         .break_ctl = mos7840_break,
2814         .tiocmget = mos7840_tiocmget,
2815         .tiocmset = mos7840_tiocmset,
2816         .get_icount = mos7840_get_icount,
2817         .attach = mos7840_startup,
2818         .disconnect = mos7840_disconnect,
2819         .release = mos7840_release,
2820         .read_bulk_callback = mos7840_bulk_in_callback,
2821         .read_int_callback = mos7840_interrupt_callback,
2822 };
2823
2824 static struct usb_serial_driver * const serial_drivers[] = {
2825         &moschip7840_4port_device, NULL
2826 };
2827
2828 module_usb_serial_driver(io_driver, serial_drivers);
2829
2830 MODULE_DESCRIPTION(DRIVER_DESC);
2831 MODULE_LICENSE("GPL");
2832
2833 module_param(debug, bool, S_IRUGO | S_IWUSR);
2834 MODULE_PARM_DESC(debug, "Debug enabled or not");