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 MOS_WDR_TIMEOUT         5000    /* default urb timeout */
  86
  87 #define MOS_PORT1       0x0200
  88 #define MOS_PORT2       0x0300
  89 #define MOS_VENREG      0x0000
  90 #define MOS_MAX_PORT    0x02
  91 #define MOS_WRITE       0x0E
  92 #define MOS_READ        0x0D
  93
  94 /* Requests */
  95 #define MCS_RD_RTYPE    0xC0
  96 #define MCS_WR_RTYPE    0x40
  97 #define MCS_RDREQ       0x0D
  98 #define MCS_WRREQ       0x0E
  99 #define MCS_CTRL_TIMEOUT        500
 100 #define VENDOR_READ_LENGTH      (0x01)
 101
 102 #define MAX_NAME_LEN    64
 103
 104 #define ZLP_REG1  0x3A          /* Zero_Flag_Reg1    58 */
 105 #define ZLP_REG5  0x3E          /* Zero_Flag_Reg5    62 */
 106
 107 /* For higher baud Rates use TIOCEXBAUD */
 108 #define TIOCEXBAUD     0x5462
 109
 110 /* vendor id and device id defines */
 111
 112 /* The native mos7840/7820 component */
 113 #define USB_VENDOR_ID_MOSCHIP           0x9710
 114 #define MOSCHIP_DEVICE_ID_7840          0x7840
 115 #define MOSCHIP_DEVICE_ID_7820          0x7820
 116 #define MOSCHIP_DEVICE_ID_7810          0x7810
 117 /* The native component can have its vendor/device id's overridden
 118  * in vendor-specific implementations.  Such devices can be handled
 119  * by making a change here, in id_table.
 120  */
 121 #define USB_VENDOR_ID_BANDB              0x0856
 122 #define BANDB_DEVICE_ID_USO9ML2_2        0xAC22
 123 #define BANDB_DEVICE_ID_USO9ML2_2P       0xBC00
 124 #define BANDB_DEVICE_ID_USO9ML2_4        0xAC24
 125 #define BANDB_DEVICE_ID_USO9ML2_4P       0xBC01
 126 #define BANDB_DEVICE_ID_US9ML2_2         0xAC29
 127 #define BANDB_DEVICE_ID_US9ML2_4         0xAC30
 128 #define BANDB_DEVICE_ID_USPTL4_2         0xAC31
 129 #define BANDB_DEVICE_ID_USPTL4_4         0xAC32
 130 #define BANDB_DEVICE_ID_USOPTL4_2        0xAC42
 131 #define BANDB_DEVICE_ID_USOPTL4_2P       0xBC02
 132 #define BANDB_DEVICE_ID_USOPTL4_4        0xAC44
 133 #define BANDB_DEVICE_ID_USOPTL4_4P       0xBC03
 134 #define BANDB_DEVICE_ID_USOPTL2_4        0xAC24
 135
 136 /* This driver also supports
 137  * ATEN UC2324 device using Moschip MCS7840
 138  * ATEN UC2322 device using Moschip MCS7820
 139  */
 140 #define USB_VENDOR_ID_ATENINTL          0x0557
 141 #define ATENINTL_DEVICE_ID_UC2324       0x2011
 142 #define ATENINTL_DEVICE_ID_UC2322       0x7820
 143
 144 /* Interrupt Routine Defines    */
 145
 146 #define SERIAL_IIR_RLS      0x06
 147 #define SERIAL_IIR_MS       0x00
 148
 149 /*
 150  *  Emulation of the bit mask on the LINE STATUS REGISTER.
 151  */
 152 #define SERIAL_LSR_DR       0x0001
 153 #define SERIAL_LSR_OE       0x0002
 154 #define SERIAL_LSR_PE       0x0004
 155 #define SERIAL_LSR_FE       0x0008
 156 #define SERIAL_LSR_BI       0x0010
 157
 158 #define MOS_MSR_DELTA_CTS   0x10
 159 #define MOS_MSR_DELTA_DSR   0x20
 160 #define MOS_MSR_DELTA_RI    0x40
 161 #define MOS_MSR_DELTA_CD    0x80
 162
 163 /* Serial Port register Address */
 164 #define INTERRUPT_ENABLE_REGISTER  ((__u16)(0x01))
 165 #define FIFO_CONTROL_REGISTER      ((__u16)(0x02))
 166 #define LINE_CONTROL_REGISTER      ((__u16)(0x03))
 167 #define MODEM_CONTROL_REGISTER     ((__u16)(0x04))
 168 #define LINE_STATUS_REGISTER       ((__u16)(0x05))
 169 #define MODEM_STATUS_REGISTER      ((__u16)(0x06))
 170 #define SCRATCH_PAD_REGISTER       ((__u16)(0x07))
 171 #define DIVISOR_LATCH_LSB          ((__u16)(0x00))
 172 #define DIVISOR_LATCH_MSB          ((__u16)(0x01))
 173
 174 #define CLK_MULTI_REGISTER         ((__u16)(0x02))
 175 #define CLK_START_VALUE_REGISTER   ((__u16)(0x03))
 176 #define GPIO_REGISTER              ((__u16)(0x07))
 177
 178 #define SERIAL_LCR_DLAB            ((__u16)(0x0080))
 179
 180 /*
 181  * URB POOL related defines
 182  */
 183 #define NUM_URBS                        16      /* URB Count */
 184 #define URB_TRANSFER_BUFFER_SIZE        32      /* URB Size  */
 185
 186 /* LED on/off milliseconds*/
 187 #define LED_ON_MS       500
 188 #define LED_OFF_MS      500
 189
 190 static int device_type;
 191
 192 static const struct usb_device_id id_table[] = {
 193         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 194         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 195         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7810)},
 196         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
 197         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
 198         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
 199         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)},
 200         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
 201         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
 202         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
 203         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
 204         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 205         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)},
 206         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 207         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)},
 208         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
 209         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
 210         {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
 211         {}                      /* terminating entry */
 212 };
 213 MODULE_DEVICE_TABLE(usb, id_table);
 214
 215 /* This structure holds all of the local port information */
 216
 217 struct moschip_port {
 218         int port_num;           /*Actual port number in the device(1,2,etc) */
 219         struct urb *write_urb;  /* write URB for this port */
 220         struct urb *read_urb;   /* read URB for this port */
 221         __u8 shadowLCR;         /* last LCR value received */
 222         __u8 shadowMCR;         /* last MCR value received */
 223         char open;
 224         char open_ports;
 225         wait_queue_head_t wait_chase;   /* for handling sleeping while waiting for chase to finish */
 226         wait_queue_head_t delta_msr_wait;       /* for handling sleeping while waiting for msr change to happen */
 227         int delta_msr_cond;
 228         struct async_icount icount;
 229         struct usb_serial_port *port;   /* loop back to the owner of this object */
 230
 231         /* Offsets */
 232         __u8 SpRegOffset;
 233         __u8 ControlRegOffset;
 234         __u8 DcrRegOffset;
 235         /* for processing control URBS in interrupt context */
 236         struct urb *control_urb;
 237         struct usb_ctrlrequest *dr;
 238         char *ctrl_buf;
 239         int MsrLsr;
 240
 241         spinlock_t pool_lock;
 242         struct urb *write_urb_pool[NUM_URBS];
 243         char busy[NUM_URBS];
 244         bool read_urb_busy;
 245
 246         /* For device(s) with LED indicator */
 247         bool has_led;
 248         bool led_flag;
 249         struct timer_list led_timer1;   /* Timer for LED on */
 250         struct timer_list led_timer2;   /* Timer for LED off */
 251 };
 252
 253 /*
 254  * mos7840_set_reg_sync
 255  *      To set the Control register by calling usb_fill_control_urb function
 256  *      by passing usb_sndctrlpipe function as parameter.
 257  */
 258
 259 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
 260                                 __u16 val)
 261 {
 262         struct usb_device *dev = port->serial->dev;
 263         val = val & 0x00ff;
 264         dev_dbg(&port->dev, "mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
 265
 266         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 267                                MCS_WR_RTYPE, val, reg, NULL, 0,
 268                                MOS_WDR_TIMEOUT);
 269 }
 270
 271 /*
 272  * mos7840_get_reg_sync
 273  *      To set the Uart register by calling usb_fill_control_urb function by
 274  *      passing usb_rcvctrlpipe function as parameter.
 275  */
 276
 277 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
 278                                 __u16 *val)
 279 {
 280         struct usb_device *dev = port->serial->dev;
 281         int ret = 0;
 282         u8 *buf;
 283
 284         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
 285         if (!buf)
 286                 return -ENOMEM;
 287
 288         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 289                               MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
 290                               MOS_WDR_TIMEOUT);
 291         *val = buf[0];
 292         dev_dbg(&port->dev, "%s offset is %x, return val %x\n", __func__, reg, *val);
 293
 294         kfree(buf);
 295         return ret;
 296 }
 297
 298 /*
 299  * mos7840_set_uart_reg
 300  *      To set the Uart register by calling usb_fill_control_urb function by
 301  *      passing usb_sndctrlpipe function as parameter.
 302  */
 303
 304 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
 305                                 __u16 val)
 306 {
 307
 308         struct usb_device *dev = port->serial->dev;
 309         val = val & 0x00ff;
 310         /* For the UART control registers, the application number need
 311            to be Or'ed */
 312         if (port->serial->num_ports == 4) {
 313                 val |= (((__u16) port->number -
 314                                 (__u16) (port->serial->minor)) + 1) << 8;
 315         } else {
 316                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 317                         val |= (((__u16) port->number -
 318                               (__u16) (port->serial->minor)) + 1) << 8;
 319                 } else {
 320                         val |= (((__u16) port->number -
 321                               (__u16) (port->serial->minor)) + 2) << 8;
 322                 }
 323         }
 324         dev_dbg(&port->dev, "%s application number is %x\n", __func__, val);
 325         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 326                                MCS_WR_RTYPE, val, reg, NULL, 0,
 327                                MOS_WDR_TIMEOUT);
 328
 329 }
 330
 331 /*
 332  * mos7840_get_uart_reg
 333  *      To set the Control register by calling usb_fill_control_urb function
 334  *      by passing usb_rcvctrlpipe function as parameter.
 335  */
 336 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
 337                                 __u16 *val)
 338 {
 339         struct usb_device *dev = port->serial->dev;
 340         int ret = 0;
 341         __u16 Wval;
 342         u8 *buf;
 343
 344         buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
 345         if (!buf)
 346                 return -ENOMEM;
 347
 348         /* Wval  is same as application number */
 349         if (port->serial->num_ports == 4) {
 350                 Wval =
 351                     (((__u16) port->number - (__u16) (port->serial->minor)) +
 352                      1) << 8;
 353         } else {
 354                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 355                         Wval = (((__u16) port->number -
 356                               (__u16) (port->serial->minor)) + 1) << 8;
 357                 } else {
 358                         Wval = (((__u16) port->number -
 359                               (__u16) (port->serial->minor)) + 2) << 8;
 360                 }
 361         }
 362         dev_dbg(&port->dev, "%s application number is %x\n", __func__, Wval);
 363         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 364                               MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
 365                               MOS_WDR_TIMEOUT);
 366         *val = buf[0];
 367
 368         kfree(buf);
 369         return ret;
 370 }
 371
 372 static void mos7840_dump_serial_port(struct usb_serial_port *port,
 373                                      struct moschip_port *mos7840_port)
 374 {
 375
 376         dev_dbg(&port->dev, "SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
 377         dev_dbg(&port->dev, "ControlRegOffset is %2x\n", mos7840_port->ControlRegOffset);
 378         dev_dbg(&port->dev, "DCRRegOffset is %2x\n", mos7840_port->DcrRegOffset);
 379
 380 }
 381
 382 /************************************************************************/
 383 /************************************************************************/
 384 /*             I N T E R F A C E   F U N C T I O N S                    */
 385 /*             I N T E R F A C E   F U N C T I O N S                    */
 386 /************************************************************************/
 387 /************************************************************************/
 388
 389 static inline void mos7840_set_port_private(struct usb_serial_port *port,
 390                                             struct moschip_port *data)
 391 {
 392         usb_set_serial_port_data(port, (void *)data);
 393 }
 394
 395 static inline struct moschip_port *mos7840_get_port_private(struct
 396                                                             usb_serial_port
 397                                                             *port)
 398 {
 399         return (struct moschip_port *)usb_get_serial_port_data(port);
 400 }
 401
 402 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
 403 {
 404         struct moschip_port *mos7840_port;
 405         struct async_icount *icount;
 406         mos7840_port = port;
 407         icount = &mos7840_port->icount;
 408         if (new_msr &
 409             (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
 410              MOS_MSR_DELTA_CD)) {
 411                 icount = &mos7840_port->icount;
 412
 413                 /* update input line counters */
 414                 if (new_msr & MOS_MSR_DELTA_CTS) {
 415                         icount->cts++;
 416                         smp_wmb();
 417                 }
 418                 if (new_msr & MOS_MSR_DELTA_DSR) {
 419                         icount->dsr++;
 420                         smp_wmb();
 421                 }
 422                 if (new_msr & MOS_MSR_DELTA_CD) {
 423                         icount->dcd++;
 424                         smp_wmb();
 425                 }
 426                 if (new_msr & MOS_MSR_DELTA_RI) {
 427                         icount->rng++;
 428                         smp_wmb();
 429                 }
 430         }
 431 }
 432
 433 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
 434 {
 435         struct async_icount *icount;
 436
 437         if (new_lsr & SERIAL_LSR_BI) {
 438                 /*
 439                  * Parity and Framing errors only count if they
 440                  * occur exclusive of a break being
 441                  * received.
 442                  */
 443                 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
 444         }
 445
 446         /* update input line counters */
 447         icount = &port->icount;
 448         if (new_lsr & SERIAL_LSR_BI) {
 449                 icount->brk++;
 450                 smp_wmb();
 451         }
 452         if (new_lsr & SERIAL_LSR_OE) {
 453                 icount->overrun++;
 454                 smp_wmb();
 455         }
 456         if (new_lsr & SERIAL_LSR_PE) {
 457                 icount->parity++;
 458                 smp_wmb();
 459         }
 460         if (new_lsr & SERIAL_LSR_FE) {
 461                 icount->frame++;
 462                 smp_wmb();
 463         }
 464 }
 465
 466 /************************************************************************/
 467 /************************************************************************/
 468 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 469 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 470 /************************************************************************/
 471 /************************************************************************/
 472
 473 static void mos7840_control_callback(struct urb *urb)
 474 {
 475         unsigned char *data;
 476         struct moschip_port *mos7840_port;
 477         struct device *dev = &urb->dev->dev;
 478         __u8 regval = 0x0;
 479         int status = urb->status;
 480
 481         mos7840_port = urb->context;
 482
 483         switch (status) {
 484         case 0:
 485                 /* success */
 486                 break;
 487         case -ECONNRESET:
 488         case -ENOENT:
 489         case -ESHUTDOWN:
 490                 /* this urb is terminated, clean up */
 491                 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
 492                 return;
 493         default:
 494                 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
 495                 return;
 496         }
 497
 498         dev_dbg(dev, "%s urb buffer size is %d\n", __func__, urb->actual_length);
 499         dev_dbg(dev, "%s mos7840_port->MsrLsr is %d port %d\n", __func__,
 500                 mos7840_port->MsrLsr, mos7840_port->port_num);
 501         data = urb->transfer_buffer;
 502         regval = (__u8) data[0];
 503         dev_dbg(dev, "%s data is %x\n", __func__, regval);
 504         if (mos7840_port->MsrLsr == 0)
 505                 mos7840_handle_new_msr(mos7840_port, regval);
 506         else if (mos7840_port->MsrLsr == 1)
 507                 mos7840_handle_new_lsr(mos7840_port, regval);
 508 }
 509
 510 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
 511                            __u16 *val)
 512 {
 513         struct usb_device *dev = mcs->port->serial->dev;
 514         struct usb_ctrlrequest *dr = mcs->dr;
 515         unsigned char *buffer = mcs->ctrl_buf;
 516         int ret;
 517
 518         dr->bRequestType = MCS_RD_RTYPE;
 519         dr->bRequest = MCS_RDREQ;
 520         dr->wValue = cpu_to_le16(Wval); /* 0 */
 521         dr->wIndex = cpu_to_le16(reg);
 522         dr->wLength = cpu_to_le16(2);
 523
 524         usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
 525                              (unsigned char *)dr, buffer, 2,
 526                              mos7840_control_callback, mcs);
 527         mcs->control_urb->transfer_buffer_length = 2;
 528         ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 529         return ret;
 530 }
 531
 532 static void mos7840_set_led_callback(struct urb *urb)
 533 {
 534         switch (urb->status) {
 535         case 0:
 536                 /* Success */
 537                 break;
 538         case -ECONNRESET:
 539         case -ENOENT:
 540         case -ESHUTDOWN:
 541                 /* This urb is terminated, clean up */
 542                 dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d",
 543                         __func__, urb->status);
 544                 break;
 545         default:
 546                 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d",
 547                         __func__, urb->status);
 548         }
 549 }
 550
 551 static void mos7840_set_led_async(struct moschip_port *mcs, __u16 wval,
 552                                 __u16 reg)
 553 {
 554         struct usb_device *dev = mcs->port->serial->dev;
 555         struct usb_ctrlrequest *dr = mcs->dr;
 556
 557         dr->bRequestType = MCS_WR_RTYPE;
 558         dr->bRequest = MCS_WRREQ;
 559         dr->wValue = cpu_to_le16(wval);
 560         dr->wIndex = cpu_to_le16(reg);
 561         dr->wLength = cpu_to_le16(0);
 562
 563         usb_fill_control_urb(mcs->control_urb, dev, usb_sndctrlpipe(dev, 0),
 564                 (unsigned char *)dr, NULL, 0, mos7840_set_led_callback, NULL);
 565
 566         usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 567 }
 568
 569 static void mos7840_set_led_sync(struct usb_serial_port *port, __u16 reg,
 570                                 __u16 val)
 571 {
 572         struct usb_device *dev = port->serial->dev;
 573
 574         usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, MCS_WR_RTYPE,
 575                         val, reg, NULL, 0, MOS_WDR_TIMEOUT);
 576 }
 577
 578 static void mos7840_led_off(unsigned long arg)
 579 {
 580         struct moschip_port *mcs = (struct moschip_port *) arg;
 581
 582         /* Turn off LED */
 583         mos7840_set_led_async(mcs, 0x0300, MODEM_CONTROL_REGISTER);
 584         mod_timer(&mcs->led_timer2,
 585                                 jiffies + msecs_to_jiffies(LED_OFF_MS));
 586 }
 587
 588 static void mos7840_led_flag_off(unsigned long arg)
 589 {
 590         struct moschip_port *mcs = (struct moschip_port *) arg;
 591
 592         mcs->led_flag = false;
 593 }
 594
 595 /*****************************************************************************
 596  * mos7840_interrupt_callback
 597  *      this is the callback function for when we have received data on the
 598  *      interrupt endpoint.
 599  *****************************************************************************/
 600
 601 static void mos7840_interrupt_callback(struct urb *urb)
 602 {
 603         int result;
 604         int length;
 605         struct moschip_port *mos7840_port;
 606         struct usb_serial *serial;
 607         __u16 Data;
 608         unsigned char *data;
 609         __u8 sp[5], st;
 610         int i, rv = 0;
 611         __u16 wval, wreg = 0;
 612         int status = urb->status;
 613
 614         switch (status) {
 615         case 0:
 616                 /* success */
 617                 break;
 618         case -ECONNRESET:
 619         case -ENOENT:
 620         case -ESHUTDOWN:
 621                 /* this urb is terminated, clean up */
 622                 dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d\n",
 623                         __func__, status);
 624                 return;
 625         default:
 626                 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n",
 627                         __func__, status);
 628                 goto exit;
 629         }
 630
 631         length = urb->actual_length;
 632         data = urb->transfer_buffer;
 633
 634         serial = urb->context;
 635
 636         /* Moschip get 5 bytes
 637          * Byte 1 IIR Port 1 (port.number is 0)
 638          * Byte 2 IIR Port 2 (port.number is 1)
 639          * Byte 3 IIR Port 3 (port.number is 2)
 640          * Byte 4 IIR Port 4 (port.number is 3)
 641          * Byte 5 FIFO status for both */
 642
 643         if (length && length > 5) {
 644                 dev_dbg(&urb->dev->dev, "%s", "Wrong data !!!\n");
 645                 return;
 646         }
 647
 648         sp[0] = (__u8) data[0];
 649         sp[1] = (__u8) data[1];
 650         sp[2] = (__u8) data[2];
 651         sp[3] = (__u8) data[3];
 652         st = (__u8) data[4];
 653
 654         for (i = 0; i < serial->num_ports; i++) {
 655                 mos7840_port = mos7840_get_port_private(serial->port[i]);
 656                 wval =
 657                     (((__u16) serial->port[i]->number -
 658                       (__u16) (serial->minor)) + 1) << 8;
 659                 if (mos7840_port->open) {
 660                         if (sp[i] & 0x01) {
 661                                 dev_dbg(&urb->dev->dev, "SP%d No Interrupt !!!\n", i);
 662                         } else {
 663                                 switch (sp[i] & 0x0f) {
 664                                 case SERIAL_IIR_RLS:
 665                                         dev_dbg(&urb->dev->dev, "Serial Port %d: Receiver status error or \n", i);
 666                                         dev_dbg(&urb->dev->dev, "address bit detected in 9-bit mode\n");
 667                                         mos7840_port->MsrLsr = 1;
 668                                         wreg = LINE_STATUS_REGISTER;
 669                                         break;
 670                                 case SERIAL_IIR_MS:
 671                                         dev_dbg(&urb->dev->dev, "Serial Port %d: Modem status change\n", i);
 672                                         mos7840_port->MsrLsr = 0;
 673                                         wreg = MODEM_STATUS_REGISTER;
 674                                         break;
 675                                 }
 676                                 rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
 677                         }
 678                 }
 679         }
 680         if (!(rv < 0))
 681                 /* the completion handler for the control urb will resubmit */
 682                 return;
 683 exit:
 684         result = usb_submit_urb(urb, GFP_ATOMIC);
 685         if (result) {
 686                 dev_err(&urb->dev->dev,
 687                         "%s - Error %d submitting interrupt urb\n",
 688                         __func__, result);
 689         }
 690 }
 691
 692 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
 693                                        const char *function)
 694 {
 695         if (!port) {
 696                 pr_debug("%s - port == NULL\n", function);
 697                 return -1;
 698         }
 699         if (!port->serial) {
 700                 pr_debug("%s - port->serial == NULL\n", function);
 701                 return -1;
 702         }
 703
 704         return 0;
 705 }
 706
 707 /* Inline functions to check the sanity of a pointer that is passed to us */
 708 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
 709                                          const char *function)
 710 {
 711         if (!serial) {
 712                 pr_debug("%s - serial == NULL\n", function);
 713                 return -1;
 714         }
 715         if (!serial->type) {
 716                 pr_debug("%s - serial->type == NULL!\n", function);
 717                 return -1;
 718         }
 719
 720         return 0;
 721 }
 722
 723 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
 724                                                  const char *function)
 725 {
 726         /* if no port was specified, or it fails a paranoia check */
 727         if (!port ||
 728             mos7840_port_paranoia_check(port, function) ||
 729             mos7840_serial_paranoia_check(port->serial, function)) {
 730                 /* then say that we don't have a valid usb_serial thing,
 731                  * which will end up genrating -ENODEV return values */
 732                 return NULL;
 733         }
 734
 735         return port->serial;
 736 }
 737
 738 /*****************************************************************************
 739  * mos7840_bulk_in_callback
 740  *      this is the callback function for when we have received data on the
 741  *      bulk in endpoint.
 742  *****************************************************************************/
 743
 744 static void mos7840_bulk_in_callback(struct urb *urb)
 745 {
 746         int retval;
 747         unsigned char *data;
 748         struct usb_serial *serial;
 749         struct usb_serial_port *port;
 750         struct moschip_port *mos7840_port;
 751         struct tty_struct *tty;
 752         int status = urb->status;
 753
 754         mos7840_port = urb->context;
 755         if (!mos7840_port)
 756                 return;
 757
 758         if (status) {
 759                 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
 760                 mos7840_port->read_urb_busy = false;
 761                 return;
 762         }
 763
 764         port = mos7840_port->port;
 765         if (mos7840_port_paranoia_check(port, __func__)) {
 766                 mos7840_port->read_urb_busy = false;
 767                 return;
 768         }
 769
 770         serial = mos7840_get_usb_serial(port, __func__);
 771         if (!serial) {
 772                 mos7840_port->read_urb_busy = false;
 773                 return;
 774         }
 775
 776         data = urb->transfer_buffer;
 777         usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
 778
 779         if (urb->actual_length) {
 780                 tty = tty_port_tty_get(&mos7840_port->port->port);
 781                 if (tty) {
 782                         tty_insert_flip_string(tty, data, urb->actual_length);
 783                         tty_flip_buffer_push(tty);
 784                         tty_kref_put(tty);
 785                 }
 786                 mos7840_port->icount.rx += urb->actual_length;
 787                 smp_wmb();
 788                 dev_dbg(&port->dev, "mos7840_port->icount.rx is %d:\n", mos7840_port->icount.rx);
 789         }
 790
 791         if (!mos7840_port->read_urb) {
 792                 dev_dbg(&port->dev, "%s", "URB KILLED !!!\n");
 793                 mos7840_port->read_urb_busy = false;
 794                 return;
 795         }
 796
 797         /* Turn on LED */
 798         if (mos7840_port->has_led && !mos7840_port->led_flag) {
 799                 mos7840_port->led_flag = true;
 800                 mos7840_set_led_async(mos7840_port, 0x0301,
 801                                         MODEM_CONTROL_REGISTER);
 802                 mod_timer(&mos7840_port->led_timer1,
 803                                 jiffies + msecs_to_jiffies(LED_ON_MS));
 804         }
 805
 806         mos7840_port->read_urb_busy = true;
 807         retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
 808
 809         if (retval) {
 810                 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
 811                 mos7840_port->read_urb_busy = false;
 812         }
 813 }
 814
 815 /*****************************************************************************
 816  * mos7840_bulk_out_data_callback
 817  *      this is the callback function for when we have finished sending
 818  *      serial data on the bulk out endpoint.
 819  *****************************************************************************/
 820
 821 static void mos7840_bulk_out_data_callback(struct urb *urb)
 822 {
 823         struct moschip_port *mos7840_port;
 824         struct usb_serial_port *port;
 825         struct tty_struct *tty;
 826         int status = urb->status;
 827         int i;
 828
 829         mos7840_port = urb->context;
 830         port = mos7840_port->port;
 831         spin_lock(&mos7840_port->pool_lock);
 832         for (i = 0; i < NUM_URBS; i++) {
 833                 if (urb == mos7840_port->write_urb_pool[i]) {
 834                         mos7840_port->busy[i] = 0;
 835                         break;
 836                 }
 837         }
 838         spin_unlock(&mos7840_port->pool_lock);
 839
 840         if (status) {
 841                 dev_dbg(&port->dev, "nonzero write bulk status received:%d\n", status);
 842                 return;
 843         }
 844
 845         if (mos7840_port_paranoia_check(port, __func__))
 846                 return;
 847
 848         tty = tty_port_tty_get(&port->port);
 849         if (tty && mos7840_port->open)
 850                 tty_wakeup(tty);
 851         tty_kref_put(tty);
 852
 853 }
 854
 855 /************************************************************************/
 856 /*       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       */
 857 /************************************************************************/
 858 #ifdef MCSSerialProbe
 859 static int mos7840_serial_probe(struct usb_serial *serial,
 860                                 const struct usb_device_id *id)
 861 {
 862
 863         /*need to implement the mode_reg reading and updating\
 864            structures usb_serial_ device_type\
 865            (i.e num_ports, num_bulkin,bulkout etc) */
 866         /* Also we can update the changes  attach */
 867         return 1;
 868 }
 869 #endif
 870
 871 /*****************************************************************************
 872  * mos7840_open
 873  *      this function is called by the tty driver when a port is opened
 874  *      If successful, we return 0
 875  *      Otherwise we return a negative error number.
 876  *****************************************************************************/
 877
 878 static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
 879 {
 880         int response;
 881         int j;
 882         struct usb_serial *serial;
 883         struct urb *urb;
 884         __u16 Data;
 885         int status;
 886         struct moschip_port *mos7840_port;
 887         struct moschip_port *port0;
 888
 889         if (mos7840_port_paranoia_check(port, __func__))
 890                 return -ENODEV;
 891
 892         serial = port->serial;
 893
 894         if (mos7840_serial_paranoia_check(serial, __func__))
 895                 return -ENODEV;
 896
 897         mos7840_port = mos7840_get_port_private(port);
 898         port0 = mos7840_get_port_private(serial->port[0]);
 899
 900         if (mos7840_port == NULL || port0 == NULL)
 901                 return -ENODEV;
 902
 903         usb_clear_halt(serial->dev, port->write_urb->pipe);
 904         usb_clear_halt(serial->dev, port->read_urb->pipe);
 905         port0->open_ports++;
 906
 907         /* Initialising the write urb pool */
 908         for (j = 0; j < NUM_URBS; ++j) {
 909                 urb = usb_alloc_urb(0, GFP_KERNEL);
 910                 mos7840_port->write_urb_pool[j] = urb;
 911
 912                 if (urb == NULL) {
 913                         dev_err(&port->dev, "No more urbs???\n");
 914                         continue;
 915                 }
 916
 917                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
 918                                                                 GFP_KERNEL);
 919                 if (!urb->transfer_buffer) {
 920                         usb_free_urb(urb);
 921                         mos7840_port->write_urb_pool[j] = NULL;
 922                         dev_err(&port->dev,
 923                                 "%s-out of memory for urb buffers.\n",
 924                                 __func__);
 925                         continue;
 926                 }
 927         }
 928
 929 /*****************************************************************************
 930  * Initialize MCS7840 -- Write Init values to corresponding Registers
 931  *
 932  * Register Index
 933  * 1 : IER
 934  * 2 : FCR
 935  * 3 : LCR
 936  * 4 : MCR
 937  *
 938  * 0x08 : SP1/2 Control Reg
 939  *****************************************************************************/
 940
 941         /* NEED to check the following Block */
 942
 943         Data = 0x0;
 944         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 945         if (status < 0) {
 946                 dev_dbg(&port->dev, "Reading Spreg failed\n");
 947                 return -1;
 948         }
 949         Data |= 0x80;
 950         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 951         if (status < 0) {
 952                 dev_dbg(&port->dev, "writing Spreg failed\n");
 953                 return -1;
 954         }
 955
 956         Data &= ~0x80;
 957         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 958         if (status < 0) {
 959                 dev_dbg(&port->dev, "writing Spreg failed\n");
 960                 return -1;
 961         }
 962         /* End of block to be checked */
 963
 964         Data = 0x0;
 965         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
 966                                                                         &Data);
 967         if (status < 0) {
 968                 dev_dbg(&port->dev, "Reading Controlreg failed\n");
 969                 return -1;
 970         }
 971         Data |= 0x08;           /* Driver done bit */
 972         Data |= 0x20;           /* rx_disable */
 973         status = mos7840_set_reg_sync(port,
 974                                 mos7840_port->ControlRegOffset, Data);
 975         if (status < 0) {
 976                 dev_dbg(&port->dev, "writing Controlreg failed\n");
 977                 return -1;
 978         }
 979         /* do register settings here */
 980         /* Set all regs to the device default values. */
 981         /***********************************
 982          * First Disable all interrupts.
 983          ***********************************/
 984         Data = 0x00;
 985         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 986         if (status < 0) {
 987                 dev_dbg(&port->dev, "disabling interrupts failed\n");
 988                 return -1;
 989         }
 990         /* Set FIFO_CONTROL_REGISTER to the default value */
 991         Data = 0x00;
 992         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 993         if (status < 0) {
 994                 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER  failed\n");
 995                 return -1;
 996         }
 997
 998         Data = 0xcf;
 999         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1000         if (status < 0) {
1001                 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER  failed\n");
1002                 return -1;
1003         }
1004
1005         Data = 0x03;
1006         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1007         mos7840_port->shadowLCR = Data;
1008
1009         Data = 0x0b;
1010         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1011         mos7840_port->shadowMCR = Data;
1012
1013         Data = 0x00;
1014         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1015         mos7840_port->shadowLCR = Data;
1016
1017         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1018         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1019
1020         Data = 0x0c;
1021         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1022
1023         Data = 0x0;
1024         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1025
1026         Data = 0x00;
1027         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1028
1029         Data = Data & ~SERIAL_LCR_DLAB;
1030         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1031         mos7840_port->shadowLCR = Data;
1032
1033         /* clearing Bulkin and Bulkout Fifo */
1034         Data = 0x0;
1035         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
1036
1037         Data = Data | 0x0c;
1038         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1039
1040         Data = Data & ~0x0c;
1041         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1042         /* Finally enable all interrupts */
1043         Data = 0x0c;
1044         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1045
1046         /* clearing rx_disable */
1047         Data = 0x0;
1048         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1049                                                                         &Data);
1050         Data = Data & ~0x20;
1051         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1052                                                                         Data);
1053
1054         /* rx_negate */
1055         Data = 0x0;
1056         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1057                                                                         &Data);
1058         Data = Data | 0x10;
1059         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1060                                                                         Data);
1061
1062         /* Check to see if we've set up our endpoint info yet    *
1063          * (can't set it up in mos7840_startup as the structures *
1064          * were not set up at that time.)                        */
1065         if (port0->open_ports == 1) {
1066                 if (serial->port[0]->interrupt_in_buffer == NULL) {
1067                         /* set up interrupt urb */
1068                         usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1069                                 serial->dev,
1070                                 usb_rcvintpipe(serial->dev,
1071                                 serial->port[0]->interrupt_in_endpointAddress),
1072                                 serial->port[0]->interrupt_in_buffer,
1073                                 serial->port[0]->interrupt_in_urb->
1074                                 transfer_buffer_length,
1075                                 mos7840_interrupt_callback,
1076                                 serial,
1077                                 serial->port[0]->interrupt_in_urb->interval);
1078
1079                         /* start interrupt read for mos7840               *
1080                          * will continue as long as mos7840 is connected  */
1081
1082                         response =
1083                             usb_submit_urb(serial->port[0]->interrupt_in_urb,
1084                                            GFP_KERNEL);
1085                         if (response) {
1086                                 dev_err(&port->dev, "%s - Error %d submitting "
1087                                         "interrupt urb\n", __func__, response);
1088                         }
1089
1090                 }
1091
1092         }
1093
1094         /* see if we've set up our endpoint info yet   *
1095          * (can't set it up in mos7840_startup as the  *
1096          * structures were not set up at that time.)   */
1097
1098         dev_dbg(&port->dev, "port number is %d\n", port->number);
1099         dev_dbg(&port->dev, "serial number is %d\n", port->serial->minor);
1100         dev_dbg(&port->dev, "Bulkin endpoint is %d\n", port->bulk_in_endpointAddress);
1101         dev_dbg(&port->dev, "BulkOut endpoint is %d\n", port->bulk_out_endpointAddress);
1102         dev_dbg(&port->dev, "Interrupt endpoint is %d\n", port->interrupt_in_endpointAddress);
1103         dev_dbg(&port->dev, "port's number in the device is %d\n", mos7840_port->port_num);
1104         mos7840_port->read_urb = port->read_urb;
1105
1106         /* set up our bulk in urb */
1107         if ((serial->num_ports == 2)
1108                 && ((((__u16)port->number -
1109                         (__u16)(port->serial->minor)) % 2) != 0)) {
1110                 usb_fill_bulk_urb(mos7840_port->read_urb,
1111                         serial->dev,
1112                         usb_rcvbulkpipe(serial->dev,
1113                                 (port->bulk_in_endpointAddress) + 2),
1114                         port->bulk_in_buffer,
1115                         mos7840_port->read_urb->transfer_buffer_length,
1116                         mos7840_bulk_in_callback, mos7840_port);
1117         } else {
1118                 usb_fill_bulk_urb(mos7840_port->read_urb,
1119                         serial->dev,
1120                         usb_rcvbulkpipe(serial->dev,
1121                                 port->bulk_in_endpointAddress),
1122                         port->bulk_in_buffer,
1123                         mos7840_port->read_urb->transfer_buffer_length,
1124                         mos7840_bulk_in_callback, mos7840_port);
1125         }
1126
1127         dev_dbg(&port->dev, "%s: bulkin endpoint is %d\n", __func__, port->bulk_in_endpointAddress);
1128         mos7840_port->read_urb_busy = true;
1129         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1130         if (response) {
1131                 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1132                         __func__, response);
1133                 mos7840_port->read_urb_busy = false;
1134         }
1135
1136         /* initialize our wait queues */
1137         init_waitqueue_head(&mos7840_port->wait_chase);
1138         init_waitqueue_head(&mos7840_port->delta_msr_wait);
1139
1140         /* initialize our icount structure */
1141         memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1142
1143         /* initialize our port settings */
1144         /* Must set to enable ints! */
1145         mos7840_port->shadowMCR = MCR_MASTER_IE;
1146         /* send a open port command */
1147         mos7840_port->open = 1;
1148         /* mos7840_change_port_settings(mos7840_port,old_termios); */
1149         mos7840_port->icount.tx = 0;
1150         mos7840_port->icount.rx = 0;
1151
1152         return 0;
1153 }
1154
1155 /*****************************************************************************
1156  * mos7840_chars_in_buffer
1157  *      this function is called by the tty driver when it wants to know how many
1158  *      bytes of data we currently have outstanding in the port (data that has
1159  *      been written, but hasn't made it out the port yet)
1160  *      If successful, we return the number of bytes left to be written in the
1161  *      system,
1162  *      Otherwise we return zero.
1163  *****************************************************************************/
1164
1165 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1166 {
1167         struct usb_serial_port *port = tty->driver_data;
1168         int i;
1169         int chars = 0;
1170         unsigned long flags;
1171         struct moschip_port *mos7840_port;
1172
1173         if (mos7840_port_paranoia_check(port, __func__))
1174                 return 0;
1175
1176         mos7840_port = mos7840_get_port_private(port);
1177         if (mos7840_port == NULL)
1178                 return 0;
1179
1180         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1181         for (i = 0; i < NUM_URBS; ++i) {
1182                 if (mos7840_port->busy[i]) {
1183                         struct urb *urb = mos7840_port->write_urb_pool[i];
1184                         chars += urb->transfer_buffer_length;
1185                 }
1186         }
1187         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1188         dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1189         return chars;
1190
1191 }
1192
1193 /*****************************************************************************
1194  * mos7840_close
1195  *      this function is called by the tty driver when a port is closed
1196  *****************************************************************************/
1197
1198 static void mos7840_close(struct usb_serial_port *port)
1199 {
1200         struct usb_serial *serial;
1201         struct moschip_port *mos7840_port;
1202         struct moschip_port *port0;
1203         int j;
1204         __u16 Data;
1205
1206         if (mos7840_port_paranoia_check(port, __func__))
1207                 return;
1208
1209         serial = mos7840_get_usb_serial(port, __func__);
1210         if (!serial)
1211                 return;
1212
1213         mos7840_port = mos7840_get_port_private(port);
1214         port0 = mos7840_get_port_private(serial->port[0]);
1215
1216         if (mos7840_port == NULL || port0 == NULL)
1217                 return;
1218
1219         for (j = 0; j < NUM_URBS; ++j)
1220                 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1221
1222         /* Freeing Write URBs */
1223         for (j = 0; j < NUM_URBS; ++j) {
1224                 if (mos7840_port->write_urb_pool[j]) {
1225                         if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1226                                 kfree(mos7840_port->write_urb_pool[j]->
1227                                       transfer_buffer);
1228
1229                         usb_free_urb(mos7840_port->write_urb_pool[j]);
1230                 }
1231         }
1232
1233         /* While closing port, shutdown all bulk read, write  *
1234          * and interrupt read if they exists                  */
1235         if (serial->dev) {
1236                 if (mos7840_port->write_urb) {
1237                         dev_dbg(&port->dev, "%s", "Shutdown bulk write\n");
1238                         usb_kill_urb(mos7840_port->write_urb);
1239                 }
1240                 if (mos7840_port->read_urb) {
1241                         dev_dbg(&port->dev, "%s", "Shutdown bulk read\n");
1242                         usb_kill_urb(mos7840_port->read_urb);
1243                         mos7840_port->read_urb_busy = false;
1244                 }
1245                 if ((&mos7840_port->control_urb)) {
1246                         dev_dbg(&port->dev, "%s", "Shutdown control read\n");
1247                         /*/      usb_kill_urb (mos7840_port->control_urb); */
1248                 }
1249         }
1250 /*      if(mos7840_port->ctrl_buf != NULL) */
1251 /*              kfree(mos7840_port->ctrl_buf); */
1252         port0->open_ports--;
1253         dev_dbg(&port->dev, "%s in close%d:in port%d\n", __func__, port0->open_ports, port->number);
1254         if (port0->open_ports == 0) {
1255                 if (serial->port[0]->interrupt_in_urb) {
1256                         dev_dbg(&port->dev, "Shutdown interrupt_in_urb\n");
1257                         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1258                 }
1259         }
1260
1261         if (mos7840_port->write_urb) {
1262                 /* if this urb had a transfer buffer already (old tx) free it */
1263                 if (mos7840_port->write_urb->transfer_buffer != NULL)
1264                         kfree(mos7840_port->write_urb->transfer_buffer);
1265                 usb_free_urb(mos7840_port->write_urb);
1266         }
1267
1268         Data = 0x0;
1269         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1270
1271         Data = 0x00;
1272         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1273
1274         mos7840_port->open = 0;
1275 }
1276
1277 /************************************************************************
1278  *
1279  * mos7840_block_until_chase_response
1280  *
1281  *      This function will block the close until one of the following:
1282  *              1. Response to our Chase comes from mos7840
1283  *              2. A timeout of 10 seconds without activity has expired
1284  *                 (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1285  *
1286  ************************************************************************/
1287
1288 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1289                                         struct moschip_port *mos7840_port)
1290 {
1291         int timeout = msecs_to_jiffies(1000);
1292         int wait = 10;
1293         int count;
1294
1295         while (1) {
1296                 count = mos7840_chars_in_buffer(tty);
1297
1298                 /* Check for Buffer status */
1299                 if (count <= 0)
1300                         return;
1301
1302                 /* Block the thread for a while */
1303                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1304                                                timeout);
1305                 /* No activity.. count down section */
1306                 wait--;
1307                 if (wait == 0) {
1308                         dev_dbg(&mos7840_port->port->dev, "%s - TIMEOUT\n", __func__);
1309                         return;
1310                 } else {
1311                         /* Reset timeout value back to seconds */
1312                         wait = 10;
1313                 }
1314         }
1315
1316 }
1317
1318 /*****************************************************************************
1319  * mos7840_break
1320  *      this function sends a break to the port
1321  *****************************************************************************/
1322 static void mos7840_break(struct tty_struct *tty, int break_state)
1323 {
1324         struct usb_serial_port *port = tty->driver_data;
1325         unsigned char data;
1326         struct usb_serial *serial;
1327         struct moschip_port *mos7840_port;
1328
1329         if (mos7840_port_paranoia_check(port, __func__))
1330                 return;
1331
1332         serial = mos7840_get_usb_serial(port, __func__);
1333         if (!serial)
1334                 return;
1335
1336         mos7840_port = mos7840_get_port_private(port);
1337
1338         if (mos7840_port == NULL)
1339                 return;
1340
1341         if (serial->dev)
1342                 /* flush and block until tx is empty */
1343                 mos7840_block_until_chase_response(tty, mos7840_port);
1344
1345         if (break_state == -1)
1346                 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1347         else
1348                 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1349
1350         /* FIXME: no locking on shadowLCR anywhere in driver */
1351         mos7840_port->shadowLCR = data;
1352         dev_dbg(&port->dev, "%s mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1353         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1354                              mos7840_port->shadowLCR);
1355 }
1356
1357 /*****************************************************************************
1358  * mos7840_write_room
1359  *      this function is called by the tty driver when it wants to know how many
1360  *      bytes of data we can accept for a specific port.
1361  *      If successful, we return the amount of room that we have for this port
1362  *      Otherwise we return a negative error number.
1363  *****************************************************************************/
1364
1365 static int mos7840_write_room(struct tty_struct *tty)
1366 {
1367         struct usb_serial_port *port = tty->driver_data;
1368         int i;
1369         int room = 0;
1370         unsigned long flags;
1371         struct moschip_port *mos7840_port;
1372
1373         if (mos7840_port_paranoia_check(port, __func__))
1374                 return -1;
1375
1376         mos7840_port = mos7840_get_port_private(port);
1377         if (mos7840_port == NULL)
1378                 return -1;
1379
1380         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1381         for (i = 0; i < NUM_URBS; ++i) {
1382                 if (!mos7840_port->busy[i])
1383                         room += URB_TRANSFER_BUFFER_SIZE;
1384         }
1385         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1386
1387         room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1388         dev_dbg(&mos7840_port->port->dev, "%s - returns %d\n", __func__, room);
1389         return room;
1390
1391 }
1392
1393 /*****************************************************************************
1394  * mos7840_write
1395  *      this function is called by the tty driver when data should be written to
1396  *      the port.
1397  *      If successful, we return the number of bytes written, otherwise we
1398  *      return a negative error number.
1399  *****************************************************************************/
1400
1401 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1402                          const unsigned char *data, int count)
1403 {
1404         int status;
1405         int i;
1406         int bytes_sent = 0;
1407         int transfer_size;
1408         unsigned long flags;
1409
1410         struct moschip_port *mos7840_port;
1411         struct usb_serial *serial;
1412         struct urb *urb;
1413         /* __u16 Data; */
1414         const unsigned char *current_position = data;
1415         unsigned char *data1;
1416
1417 #ifdef NOTMOS7840
1418         Data = 0x00;
1419         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1420         mos7840_port->shadowLCR = Data;
1421         dev_dbg(&port->dev, "%s: LINE_CONTROL_REGISTER is %x\n", __func__, Data);
1422         dev_dbg(&port->dev, "%s: mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1423
1424         /* Data = 0x03; */
1425         /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1426         /* mos7840_port->shadowLCR=Data;//Need to add later */
1427
1428         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1429         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1430
1431         /* Data = 0x0c; */
1432         /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1433         Data = 0x00;
1434         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1435         dev_dbg(&port->dev, "%s: DLL value is %x\n", __func__, Data);
1436
1437         Data = 0x0;
1438         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1439         dev_dbg(&port->dev, "%s: DLM value is %x\n", __func__, Data);
1440
1441         Data = Data & ~SERIAL_LCR_DLAB;
1442         dev_dbg(&port->dev, "%s: mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1443         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1444 #endif
1445
1446         if (mos7840_port_paranoia_check(port, __func__))
1447                 return -1;
1448
1449         serial = port->serial;
1450         if (mos7840_serial_paranoia_check(serial, __func__))
1451                 return -1;
1452
1453         mos7840_port = mos7840_get_port_private(port);
1454         if (mos7840_port == NULL)
1455                 return -1;
1456
1457         /* try to find a free urb in the list */
1458         urb = NULL;
1459
1460         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1461         for (i = 0; i < NUM_URBS; ++i) {
1462                 if (!mos7840_port->busy[i]) {
1463                         mos7840_port->busy[i] = 1;
1464                         urb = mos7840_port->write_urb_pool[i];
1465                         dev_dbg(&port->dev, "URB:%d\n", i);
1466                         break;
1467                 }
1468         }
1469         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1470
1471         if (urb == NULL) {
1472                 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
1473                 goto exit;
1474         }
1475
1476         if (urb->transfer_buffer == NULL) {
1477                 urb->transfer_buffer =
1478                     kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1479
1480                 if (urb->transfer_buffer == NULL) {
1481                         dev_err_console(port, "%s no more kernel memory...\n",
1482                                 __func__);
1483                         goto exit;
1484                 }
1485         }
1486         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1487
1488         memcpy(urb->transfer_buffer, current_position, transfer_size);
1489
1490         /* fill urb with data and submit  */
1491         if ((serial->num_ports == 2)
1492                 && ((((__u16)port->number -
1493                         (__u16)(port->serial->minor)) % 2) != 0)) {
1494                 usb_fill_bulk_urb(urb,
1495                         serial->dev,
1496                         usb_sndbulkpipe(serial->dev,
1497                                 (port->bulk_out_endpointAddress) + 2),
1498                         urb->transfer_buffer,
1499                         transfer_size,
1500                         mos7840_bulk_out_data_callback, mos7840_port);
1501         } else {
1502                 usb_fill_bulk_urb(urb,
1503                         serial->dev,
1504                         usb_sndbulkpipe(serial->dev,
1505                                 port->bulk_out_endpointAddress),
1506                         urb->transfer_buffer,
1507                         transfer_size,
1508                         mos7840_bulk_out_data_callback, mos7840_port);
1509         }
1510
1511         data1 = urb->transfer_buffer;
1512         dev_dbg(&port->dev, "bulkout endpoint is %d\n", port->bulk_out_endpointAddress);
1513
1514         /* Turn on LED */
1515         if (mos7840_port->has_led && !mos7840_port->led_flag) {
1516                 mos7840_port->led_flag = true;
1517                 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0301);
1518                 mod_timer(&mos7840_port->led_timer1,
1519                                 jiffies + msecs_to_jiffies(LED_ON_MS));
1520         }
1521
1522         /* send it down the pipe */
1523         status = usb_submit_urb(urb, GFP_ATOMIC);
1524
1525         if (status) {
1526                 mos7840_port->busy[i] = 0;
1527                 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
1528                         "with status = %d\n", __func__, status);
1529                 bytes_sent = status;
1530                 goto exit;
1531         }
1532         bytes_sent = transfer_size;
1533         mos7840_port->icount.tx += transfer_size;
1534         smp_wmb();
1535         dev_dbg(&port->dev, "mos7840_port->icount.tx is %d:\n", mos7840_port->icount.tx);
1536 exit:
1537         return bytes_sent;
1538
1539 }
1540
1541 /*****************************************************************************
1542  * mos7840_throttle
1543  *      this function is called by the tty driver when it wants to stop the data
1544  *      being read from the port.
1545  *****************************************************************************/
1546
1547 static void mos7840_throttle(struct tty_struct *tty)
1548 {
1549         struct usb_serial_port *port = tty->driver_data;
1550         struct moschip_port *mos7840_port;
1551         int status;
1552
1553         if (mos7840_port_paranoia_check(port, __func__))
1554                 return;
1555
1556         mos7840_port = mos7840_get_port_private(port);
1557
1558         if (mos7840_port == NULL)
1559                 return;
1560
1561         if (!mos7840_port->open) {
1562                 dev_dbg(&port->dev, "%s", "port not opened\n");
1563                 return;
1564         }
1565
1566         /* if we are implementing XON/XOFF, send the stop character */
1567         if (I_IXOFF(tty)) {
1568                 unsigned char stop_char = STOP_CHAR(tty);
1569                 status = mos7840_write(tty, port, &stop_char, 1);
1570                 if (status <= 0)
1571                         return;
1572         }
1573         /* if we are implementing RTS/CTS, toggle that line */
1574         if (tty->termios.c_cflag & CRTSCTS) {
1575                 mos7840_port->shadowMCR &= ~MCR_RTS;
1576                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1577                                          mos7840_port->shadowMCR);
1578                 if (status < 0)
1579                         return;
1580         }
1581 }
1582
1583 /*****************************************************************************
1584  * mos7840_unthrottle
1585  *      this function is called by the tty driver when it wants to resume
1586  *      the data being read from the port (called after mos7840_throttle is
1587  *      called)
1588  *****************************************************************************/
1589 static void mos7840_unthrottle(struct tty_struct *tty)
1590 {
1591         struct usb_serial_port *port = tty->driver_data;
1592         int status;
1593         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1594
1595         if (mos7840_port_paranoia_check(port, __func__))
1596                 return;
1597
1598         if (mos7840_port == NULL)
1599                 return;
1600
1601         if (!mos7840_port->open) {
1602                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1603                 return;
1604         }
1605
1606         /* if we are implementing XON/XOFF, send the start character */
1607         if (I_IXOFF(tty)) {
1608                 unsigned char start_char = START_CHAR(tty);
1609                 status = mos7840_write(tty, port, &start_char, 1);
1610                 if (status <= 0)
1611                         return;
1612         }
1613
1614         /* if we are implementing RTS/CTS, toggle that line */
1615         if (tty->termios.c_cflag & CRTSCTS) {
1616                 mos7840_port->shadowMCR |= MCR_RTS;
1617                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1618                                          mos7840_port->shadowMCR);
1619                 if (status < 0)
1620                         return;
1621         }
1622 }
1623
1624 static int mos7840_tiocmget(struct tty_struct *tty)
1625 {
1626         struct usb_serial_port *port = tty->driver_data;
1627         struct moschip_port *mos7840_port;
1628         unsigned int result;
1629         __u16 msr;
1630         __u16 mcr;
1631         int status;
1632         mos7840_port = mos7840_get_port_private(port);
1633
1634         if (mos7840_port == NULL)
1635                 return -ENODEV;
1636
1637         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1638         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1639         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1640             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1641             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1642             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1643             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1644             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1645             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1646
1647         dev_dbg(&port->dev, "%s - 0x%04X\n", __func__, result);
1648
1649         return result;
1650 }
1651
1652 static int mos7840_tiocmset(struct tty_struct *tty,
1653                             unsigned int set, unsigned int clear)
1654 {
1655         struct usb_serial_port *port = tty->driver_data;
1656         struct moschip_port *mos7840_port;
1657         unsigned int mcr;
1658         int status;
1659
1660         mos7840_port = mos7840_get_port_private(port);
1661
1662         if (mos7840_port == NULL)
1663                 return -ENODEV;
1664
1665         /* FIXME: What locks the port registers ? */
1666         mcr = mos7840_port->shadowMCR;
1667         if (clear & TIOCM_RTS)
1668                 mcr &= ~MCR_RTS;
1669         if (clear & TIOCM_DTR)
1670                 mcr &= ~MCR_DTR;
1671         if (clear & TIOCM_LOOP)
1672                 mcr &= ~MCR_LOOPBACK;
1673
1674         if (set & TIOCM_RTS)
1675                 mcr |= MCR_RTS;
1676         if (set & TIOCM_DTR)
1677                 mcr |= MCR_DTR;
1678         if (set & TIOCM_LOOP)
1679                 mcr |= MCR_LOOPBACK;
1680
1681         mos7840_port->shadowMCR = mcr;
1682
1683         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1684         if (status < 0) {
1685                 dev_dbg(&port->dev, "setting MODEM_CONTROL_REGISTER Failed\n");
1686                 return status;
1687         }
1688
1689         return 0;
1690 }
1691
1692 /*****************************************************************************
1693  * mos7840_calc_baud_rate_divisor
1694  *      this function calculates the proper baud rate divisor for the specified
1695  *      baud rate.
1696  *****************************************************************************/
1697 static int mos7840_calc_baud_rate_divisor(struct usb_serial_port *port,
1698                                           int baudRate, int *divisor,
1699                                           __u16 *clk_sel_val)
1700 {
1701         dev_dbg(&port->dev, "%s - %d\n", __func__, baudRate);
1702
1703         if (baudRate <= 115200) {
1704                 *divisor = 115200 / baudRate;
1705                 *clk_sel_val = 0x0;
1706         }
1707         if ((baudRate > 115200) && (baudRate <= 230400)) {
1708                 *divisor = 230400 / baudRate;
1709                 *clk_sel_val = 0x10;
1710         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1711                 *divisor = 403200 / baudRate;
1712                 *clk_sel_val = 0x20;
1713         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1714                 *divisor = 460800 / baudRate;
1715                 *clk_sel_val = 0x30;
1716         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1717                 *divisor = 806400 / baudRate;
1718                 *clk_sel_val = 0x40;
1719         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1720                 *divisor = 921600 / baudRate;
1721                 *clk_sel_val = 0x50;
1722         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1723                 *divisor = 1572864 / baudRate;
1724                 *clk_sel_val = 0x60;
1725         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1726                 *divisor = 3145728 / baudRate;
1727                 *clk_sel_val = 0x70;
1728         }
1729         return 0;
1730
1731 #ifdef NOTMCS7840
1732
1733         for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1734                 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1735                         *divisor = mos7840_divisor_table[i].Divisor;
1736                         return 0;
1737                 }
1738         }
1739
1740         /* After trying for all the standard baud rates    *
1741          * Try calculating the divisor for this baud rate  */
1742
1743         if (baudrate > 75 && baudrate < 230400) {
1744                 /* get the divisor */
1745                 custom = (__u16) (230400L / baudrate);
1746
1747                 /* Check for round off */
1748                 round1 = (__u16) (2304000L / baudrate);
1749                 round = (__u16) (round1 - (custom * 10));
1750                 if (round > 4)
1751                         custom++;
1752                 *divisor = custom;
1753
1754                 dev_dbg(&port->dev, " Baud %d = %d\n", baudrate, custom);
1755                 return 0;
1756         }
1757
1758         dev_dbg(&port->dev, "%s", " Baud calculation Failed...\n");
1759         return -1;
1760 #endif
1761 }
1762
1763 /*****************************************************************************
1764  * mos7840_send_cmd_write_baud_rate
1765  *      this function sends the proper command to change the baud rate of the
1766  *      specified port.
1767  *****************************************************************************/
1768
1769 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1770                                             int baudRate)
1771 {
1772         int divisor = 0;
1773         int status;
1774         __u16 Data;
1775         unsigned char number;
1776         __u16 clk_sel_val;
1777         struct usb_serial_port *port;
1778
1779         if (mos7840_port == NULL)
1780                 return -1;
1781
1782         port = mos7840_port->port;
1783         if (mos7840_port_paranoia_check(port, __func__))
1784                 return -1;
1785
1786         if (mos7840_serial_paranoia_check(port->serial, __func__))
1787                 return -1;
1788
1789         number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1790
1791         dev_dbg(&port->dev, "%s - port = %d, baud = %d\n", __func__,
1792                 mos7840_port->port->number, baudRate);
1793         /* reset clk_uart_sel in spregOffset */
1794         if (baudRate > 115200) {
1795 #ifdef HW_flow_control
1796                 /* NOTE: need to see the pther register to modify */
1797                 /* setting h/w flow control bit to 1 */
1798                 Data = 0x2b;
1799                 mos7840_port->shadowMCR = Data;
1800                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1801                                                                         Data);
1802                 if (status < 0) {
1803                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1804                         return -1;
1805                 }
1806 #endif
1807
1808         } else {
1809 #ifdef HW_flow_control
1810                 /* setting h/w flow control bit to 0 */
1811                 Data = 0xb;
1812                 mos7840_port->shadowMCR = Data;
1813                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1814                                                                         Data);
1815                 if (status < 0) {
1816                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1817                         return -1;
1818                 }
1819 #endif
1820
1821         }
1822
1823         if (1) {                /* baudRate <= 115200) */
1824                 clk_sel_val = 0x0;
1825                 Data = 0x0;
1826                 status = mos7840_calc_baud_rate_divisor(port, baudRate, &divisor,
1827                                                    &clk_sel_val);
1828                 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1829                                                                  &Data);
1830                 if (status < 0) {
1831                         dev_dbg(&port->dev, "reading spreg failed in set_serial_baud\n");
1832                         return -1;
1833                 }
1834                 Data = (Data & 0x8f) | clk_sel_val;
1835                 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1836                                                                 Data);
1837                 if (status < 0) {
1838                         dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1839                         return -1;
1840                 }
1841                 /* Calculate the Divisor */
1842
1843                 if (status) {
1844                         dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1845                         return status;
1846                 }
1847                 /* Enable access to divisor latch */
1848                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1849                 mos7840_port->shadowLCR = Data;
1850                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1851
1852                 /* Write the divisor */
1853                 Data = (unsigned char)(divisor & 0xff);
1854                 dev_dbg(&port->dev, "set_serial_baud Value to write DLL is %x\n", Data);
1855                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1856
1857                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1858                 dev_dbg(&port->dev, "set_serial_baud Value to write DLM is %x\n", Data);
1859                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1860
1861                 /* Disable access to divisor latch */
1862                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1863                 mos7840_port->shadowLCR = Data;
1864                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1865
1866         }
1867         return status;
1868 }
1869
1870 /*****************************************************************************
1871  * mos7840_change_port_settings
1872  *      This routine is called to set the UART on the device to match
1873  *      the specified new settings.
1874  *****************************************************************************/
1875
1876 static void mos7840_change_port_settings(struct tty_struct *tty,
1877         struct moschip_port *mos7840_port, struct ktermios *old_termios)
1878 {
1879         int baud;
1880         unsigned cflag;
1881         unsigned iflag;
1882         __u8 lData;
1883         __u8 lParity;
1884         __u8 lStop;
1885         int status;
1886         __u16 Data;
1887         struct usb_serial_port *port;
1888         struct usb_serial *serial;
1889
1890         if (mos7840_port == NULL)
1891                 return;
1892
1893         port = mos7840_port->port;
1894
1895         if (mos7840_port_paranoia_check(port, __func__))
1896                 return;
1897
1898         if (mos7840_serial_paranoia_check(port->serial, __func__))
1899                 return;
1900
1901         serial = port->serial;
1902
1903         if (!mos7840_port->open) {
1904                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1905                 return;
1906         }
1907
1908         lData = LCR_BITS_8;
1909         lStop = LCR_STOP_1;
1910         lParity = LCR_PAR_NONE;
1911
1912         cflag = tty->termios.c_cflag;
1913         iflag = tty->termios.c_iflag;
1914
1915         /* Change the number of bits */
1916         if (cflag & CSIZE) {
1917                 switch (cflag & CSIZE) {
1918                 case CS5:
1919                         lData = LCR_BITS_5;
1920                         break;
1921
1922                 case CS6:
1923                         lData = LCR_BITS_6;
1924                         break;
1925
1926                 case CS7:
1927                         lData = LCR_BITS_7;
1928                         break;
1929                 default:
1930                 case CS8:
1931                         lData = LCR_BITS_8;
1932                         break;
1933                 }
1934         }
1935         /* Change the Parity bit */
1936         if (cflag & PARENB) {
1937                 if (cflag & PARODD) {
1938                         lParity = LCR_PAR_ODD;
1939                         dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
1940                 } else {
1941                         lParity = LCR_PAR_EVEN;
1942                         dev_dbg(&port->dev, "%s - parity = even\n", __func__);
1943                 }
1944
1945         } else {
1946                 dev_dbg(&port->dev, "%s - parity = none\n", __func__);
1947         }
1948
1949         if (cflag & CMSPAR)
1950                 lParity = lParity | 0x20;
1951
1952         /* Change the Stop bit */
1953         if (cflag & CSTOPB) {
1954                 lStop = LCR_STOP_2;
1955                 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
1956         } else {
1957                 lStop = LCR_STOP_1;
1958                 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
1959         }
1960
1961         /* Update the LCR with the correct value */
1962         mos7840_port->shadowLCR &=
1963             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1964         mos7840_port->shadowLCR |= (lData | lParity | lStop);
1965
1966         dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is %x\n", __func__,
1967                 mos7840_port->shadowLCR);
1968         /* Disable Interrupts */
1969         Data = 0x00;
1970         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1971
1972         Data = 0x00;
1973         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1974
1975         Data = 0xcf;
1976         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1977
1978         /* Send the updated LCR value to the mos7840 */
1979         Data = mos7840_port->shadowLCR;
1980
1981         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1982
1983         Data = 0x00b;
1984         mos7840_port->shadowMCR = Data;
1985         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1986         Data = 0x00b;
1987         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1988
1989         /* set up the MCR register and send it to the mos7840 */
1990
1991         mos7840_port->shadowMCR = MCR_MASTER_IE;
1992         if (cflag & CBAUD)
1993                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
1994
1995         if (cflag & CRTSCTS)
1996                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
1997         else
1998                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
1999
2000         Data = mos7840_port->shadowMCR;
2001         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2002
2003         /* Determine divisor based on baud rate */
2004         baud = tty_get_baud_rate(tty);
2005
2006         if (!baud) {
2007                 /* pick a default, any default... */
2008                 dev_dbg(&port->dev, "%s", "Picked default baud...\n");
2009                 baud = 9600;
2010         }
2011
2012         dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
2013         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2014
2015         /* Enable Interrupts */
2016         Data = 0x0c;
2017         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2018
2019         if (mos7840_port->read_urb_busy == false) {
2020                 mos7840_port->read_urb_busy = true;
2021                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2022                 if (status) {
2023                         dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
2024                             status);
2025                         mos7840_port->read_urb_busy = false;
2026                 }
2027         }
2028         wake_up(&mos7840_port->delta_msr_wait);
2029         mos7840_port->delta_msr_cond = 1;
2030         dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is End %x\n", __func__,
2031                 mos7840_port->shadowLCR);
2032 }
2033
2034 /*****************************************************************************
2035  * mos7840_set_termios
2036  *      this function is called by the tty driver when it wants to change
2037  *      the termios structure
2038  *****************************************************************************/
2039
2040 static void mos7840_set_termios(struct tty_struct *tty,
2041                                 struct usb_serial_port *port,
2042                                 struct ktermios *old_termios)
2043 {
2044         int status;
2045         unsigned int cflag;
2046         struct usb_serial *serial;
2047         struct moschip_port *mos7840_port;
2048
2049         if (mos7840_port_paranoia_check(port, __func__))
2050                 return;
2051
2052         serial = port->serial;
2053
2054         if (mos7840_serial_paranoia_check(serial, __func__))
2055                 return;
2056
2057         mos7840_port = mos7840_get_port_private(port);
2058
2059         if (mos7840_port == NULL)
2060                 return;
2061
2062         if (!mos7840_port->open) {
2063                 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
2064                 return;
2065         }
2066
2067         dev_dbg(&port->dev, "%s", "setting termios - \n");
2068
2069         cflag = tty->termios.c_cflag;
2070
2071         dev_dbg(&port->dev, "%s - clfag %08x iflag %08x\n", __func__,
2072                 tty->termios.c_cflag, RELEVANT_IFLAG(tty->termios.c_iflag));
2073         dev_dbg(&port->dev, "%s - old clfag %08x old iflag %08x\n", __func__,
2074                 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2075         dev_dbg(&port->dev, "%s - port %d\n", __func__, port->number);
2076
2077         /* change the port settings to the new ones specified */
2078
2079         mos7840_change_port_settings(tty, mos7840_port, old_termios);
2080
2081         if (!mos7840_port->read_urb) {
2082                 dev_dbg(&port->dev, "%s", "URB KILLED !!!!!\n");
2083                 return;
2084         }
2085
2086         if (mos7840_port->read_urb_busy == false) {
2087                 mos7840_port->read_urb_busy = true;
2088                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2089                 if (status) {
2090                         dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
2091                             status);
2092                         mos7840_port->read_urb_busy = false;
2093                 }
2094         }
2095 }
2096
2097 /*****************************************************************************
2098  * mos7840_get_lsr_info - get line status register info
2099  *
2100  * Purpose: Let user call ioctl() to get info when the UART physically
2101  *          is emptied.  On bus types like RS485, the transmitter must
2102  *          release the bus after transmitting. This must be done when
2103  *          the transmit shift register is empty, not be done when the
2104  *          transmit holding register is empty.  This functionality
2105  *          allows an RS485 driver to be written in user space.
2106  *****************************************************************************/
2107
2108 static int mos7840_get_lsr_info(struct tty_struct *tty,
2109                                 unsigned int __user *value)
2110 {
2111         int count;
2112         unsigned int result = 0;
2113
2114         count = mos7840_chars_in_buffer(tty);
2115         if (count == 0)
2116                 result = TIOCSER_TEMT;
2117
2118         if (copy_to_user(value, &result, sizeof(int)))
2119                 return -EFAULT;
2120         return 0;
2121 }
2122
2123 /*****************************************************************************
2124  * mos7840_get_serial_info
2125  *      function to get information about serial port
2126  *****************************************************************************/
2127
2128 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2129                                    struct serial_struct __user *retinfo)
2130 {
2131         struct serial_struct tmp;
2132
2133         if (mos7840_port == NULL)
2134                 return -1;
2135
2136         if (!retinfo)
2137                 return -EFAULT;
2138
2139         memset(&tmp, 0, sizeof(tmp));
2140
2141         tmp.type = PORT_16550A;
2142         tmp.line = mos7840_port->port->serial->minor;
2143         tmp.port = mos7840_port->port->number;
2144         tmp.irq = 0;
2145         tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2146         tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2147         tmp.baud_base = 9600;
2148         tmp.close_delay = 5 * HZ;
2149         tmp.closing_wait = 30 * HZ;
2150
2151         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2152                 return -EFAULT;
2153         return 0;
2154 }
2155
2156 static int mos7840_get_icount(struct tty_struct *tty,
2157                         struct serial_icounter_struct *icount)
2158 {
2159         struct usb_serial_port *port = tty->driver_data;
2160         struct moschip_port *mos7840_port;
2161         struct async_icount cnow;
2162
2163         mos7840_port = mos7840_get_port_private(port);
2164         cnow = mos7840_port->icount;
2165
2166         smp_rmb();
2167         icount->cts = cnow.cts;
2168         icount->dsr = cnow.dsr;
2169         icount->rng = cnow.rng;
2170         icount->dcd = cnow.dcd;
2171         icount->rx = cnow.rx;
2172         icount->tx = cnow.tx;
2173         icount->frame = cnow.frame;
2174         icount->overrun = cnow.overrun;
2175         icount->parity = cnow.parity;
2176         icount->brk = cnow.brk;
2177         icount->buf_overrun = cnow.buf_overrun;
2178
2179         dev_dbg(&port->dev, "%s TIOCGICOUNT RX=%d, TX=%d\n", __func__,
2180                 icount->rx, icount->tx);
2181         return 0;
2182 }
2183
2184 /*****************************************************************************
2185  * SerialIoctl
2186  *      this function handles any ioctl calls to the driver
2187  *****************************************************************************/
2188
2189 static int mos7840_ioctl(struct tty_struct *tty,
2190                          unsigned int cmd, unsigned long arg)
2191 {
2192         struct usb_serial_port *port = tty->driver_data;
2193         void __user *argp = (void __user *)arg;
2194         struct moschip_port *mos7840_port;
2195
2196         struct async_icount cnow;
2197         struct async_icount cprev;
2198
2199         if (mos7840_port_paranoia_check(port, __func__))
2200                 return -1;
2201
2202         mos7840_port = mos7840_get_port_private(port);
2203
2204         if (mos7840_port == NULL)
2205                 return -1;
2206
2207         dev_dbg(&port->dev, "%s - cmd = 0x%x\n", __func__, cmd);
2208
2209         switch (cmd) {
2210                 /* return number of bytes available */
2211
2212         case TIOCSERGETLSR:
2213                 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
2214                 return mos7840_get_lsr_info(tty, argp);
2215
2216         case TIOCGSERIAL:
2217                 dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__);
2218                 return mos7840_get_serial_info(mos7840_port, argp);
2219
2220         case TIOCSSERIAL:
2221                 dev_dbg(&port->dev, "%s TIOCSSERIAL\n", __func__);
2222                 break;
2223
2224         case TIOCMIWAIT:
2225                 dev_dbg(&port->dev, "%s  TIOCMIWAIT\n", __func__);
2226                 cprev = mos7840_port->icount;
2227                 while (1) {
2228                         /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2229                         mos7840_port->delta_msr_cond = 0;
2230                         wait_event_interruptible(mos7840_port->delta_msr_wait,
2231                                                  (mos7840_port->
2232                                                   delta_msr_cond == 1));
2233
2234                         /* see if a signal did it */
2235                         if (signal_pending(current))
2236                                 return -ERESTARTSYS;
2237                         cnow = mos7840_port->icount;
2238                         smp_rmb();
2239                         if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2240                             cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2241                                 return -EIO;    /* no change => error */
2242                         if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2243                             ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2244                             ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2245                             ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2246                                 return 0;
2247                         }
2248                         cprev = cnow;
2249                 }
2250                 /* NOTREACHED */
2251                 break;
2252
2253         default:
2254                 break;
2255         }
2256         return -ENOIOCTLCMD;
2257 }
2258
2259 static int mos7810_check(struct usb_serial *serial)
2260 {
2261         int i, pass_count = 0;
2262         __u16 data = 0, mcr_data = 0;
2263         __u16 test_pattern = 0x55AA;
2264
2265         /* Store MCR setting */
2266         usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2267                 MCS_RDREQ, MCS_RD_RTYPE, 0x0300, MODEM_CONTROL_REGISTER,
2268                 &mcr_data, VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2269
2270         for (i = 0; i < 16; i++) {
2271                 /* Send the 1-bit test pattern out to MCS7810 test pin */
2272                 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2273                         MCS_WRREQ, MCS_WR_RTYPE,
2274                         (0x0300 | (((test_pattern >> i) & 0x0001) << 1)),
2275                         MODEM_CONTROL_REGISTER, NULL, 0, MOS_WDR_TIMEOUT);
2276
2277                 /* Read the test pattern back */
2278                 usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2279                         MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, &data,
2280                         VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2281
2282                 /* If this is a MCS7810 device, both test patterns must match */
2283                 if (((test_pattern >> i) ^ (~data >> 1)) & 0x0001)
2284                         break;
2285
2286                 pass_count++;
2287         }
2288
2289         /* Restore MCR setting */
2290         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), MCS_WRREQ,
2291                 MCS_WR_RTYPE, 0x0300 | mcr_data, MODEM_CONTROL_REGISTER, NULL,
2292                 0, MOS_WDR_TIMEOUT);
2293
2294         if (pass_count == 16)
2295                 return 1;
2296
2297         return 0;
2298 }
2299
2300 static int mos7840_calc_num_ports(struct usb_serial *serial)
2301 {
2302         __u16 data = 0x00;
2303         int mos7840_num_ports;
2304
2305         usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2306                 MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, &data,
2307                 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2308
2309         if (serial->dev->descriptor.idProduct == MOSCHIP_DEVICE_ID_7810 ||
2310                 serial->dev->descriptor.idProduct == MOSCHIP_DEVICE_ID_7820) {
2311                 device_type = serial->dev->descriptor.idProduct;
2312         } else {
2313                 /* For a MCS7840 device GPIO0 must be set to 1 */
2314                 if ((data & 0x01) == 1)
2315                         device_type = MOSCHIP_DEVICE_ID_7840;
2316                 else if (mos7810_check(serial))
2317                         device_type = MOSCHIP_DEVICE_ID_7810;
2318                 else
2319                         device_type = MOSCHIP_DEVICE_ID_7820;
2320         }
2321
2322         mos7840_num_ports = (device_type >> 4) & 0x000F;
2323         serial->num_bulk_in = mos7840_num_ports;
2324         serial->num_bulk_out = mos7840_num_ports;
2325         serial->num_ports = mos7840_num_ports;
2326
2327         return mos7840_num_ports;
2328 }
2329
2330 static int mos7840_port_probe(struct usb_serial_port *port)
2331 {
2332         struct usb_serial *serial = port->serial;
2333         struct moschip_port *mos7840_port;
2334         int status;
2335         int pnum;
2336         __u16 Data;
2337
2338         /* we set up the pointers to the endpoints in the mos7840_open *
2339          * function, as the structures aren't created yet.             */
2340
2341         pnum = port->number - serial->minor;
2342
2343         dev_dbg(&port->dev, "mos7840_startup: configuring port %d\n", pnum);
2344         mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2345         if (mos7840_port == NULL) {
2346                 dev_err(&port->dev, "%s - Out of memory\n", __func__);
2347                 return -ENOMEM;
2348         }
2349
2350         /* Initialize all port interrupt end point to port 0 int
2351          * endpoint. Our device has only one interrupt end point
2352          * common to all port */
2353
2354         mos7840_port->port = port;
2355         mos7840_set_port_private(port, mos7840_port);
2356         spin_lock_init(&mos7840_port->pool_lock);
2357
2358         /* minor is not initialised until later by
2359          * usb-serial.c:get_free_serial() and cannot therefore be used
2360          * to index device instances */
2361         mos7840_port->port_num = pnum + 1;
2362         dev_dbg(&port->dev, "port->number = %d\n", port->number);
2363         dev_dbg(&port->dev, "port->serial->minor = %d\n", port->serial->minor);
2364         dev_dbg(&port->dev, "mos7840_port->port_num = %d\n", mos7840_port->port_num);
2365         dev_dbg(&port->dev, "serial->minor = %d\n", serial->minor);
2366
2367         if (mos7840_port->port_num == 1) {
2368                 mos7840_port->SpRegOffset = 0x0;
2369                 mos7840_port->ControlRegOffset = 0x1;
2370                 mos7840_port->DcrRegOffset = 0x4;
2371         } else if ((mos7840_port->port_num == 2) && (serial->num_ports == 4)) {
2372                 mos7840_port->SpRegOffset = 0x8;
2373                 mos7840_port->ControlRegOffset = 0x9;
2374                 mos7840_port->DcrRegOffset = 0x16;
2375         } else if ((mos7840_port->port_num == 2) && (serial->num_ports == 2)) {
2376                 mos7840_port->SpRegOffset = 0xa;
2377                 mos7840_port->ControlRegOffset = 0xb;
2378                 mos7840_port->DcrRegOffset = 0x19;
2379         } else if ((mos7840_port->port_num == 3) && (serial->num_ports == 4)) {
2380                 mos7840_port->SpRegOffset = 0xa;
2381                 mos7840_port->ControlRegOffset = 0xb;
2382                 mos7840_port->DcrRegOffset = 0x19;
2383         } else if ((mos7840_port->port_num == 4) && (serial->num_ports == 4)) {
2384                 mos7840_port->SpRegOffset = 0xc;
2385                 mos7840_port->ControlRegOffset = 0xd;
2386                 mos7840_port->DcrRegOffset = 0x1c;
2387         }
2388         mos7840_dump_serial_port(port, mos7840_port);
2389         mos7840_set_port_private(port, mos7840_port);
2390
2391         /* enable rx_disable bit in control register */
2392         status = mos7840_get_reg_sync(port,
2393                         mos7840_port->ControlRegOffset, &Data);
2394         if (status < 0) {
2395                 dev_dbg(&port->dev, "Reading ControlReg failed status-0x%x\n", status);
2396                 goto out;
2397         } else
2398                 dev_dbg(&port->dev, "ControlReg Reading success val is %x, status%d\n", Data, status);
2399         Data |= 0x08;   /* setting driver done bit */
2400         Data |= 0x04;   /* sp1_bit to have cts change reflect in
2401                            modem status reg */
2402
2403         /* Data |= 0x20; //rx_disable bit */
2404         status = mos7840_set_reg_sync(port,
2405                         mos7840_port->ControlRegOffset, Data);
2406         if (status < 0) {
2407                 dev_dbg(&port->dev, "Writing ControlReg failed(rx_disable) status-0x%x\n", status);
2408                 goto out;
2409         } else
2410                 dev_dbg(&port->dev, "ControlReg Writing success(rx_disable) status%d\n", status);
2411
2412         /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2413            and 0x24 in DCR3 */
2414         Data = 0x01;
2415         status = mos7840_set_reg_sync(port,
2416                         (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2417         if (status < 0) {
2418                 dev_dbg(&port->dev, "Writing DCR0 failed status-0x%x\n", status);
2419                 goto out;
2420         } else
2421                 dev_dbg(&port->dev, "DCR0 Writing success status%d\n", status);
2422
2423         Data = 0x05;
2424         status = mos7840_set_reg_sync(port,
2425                         (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2426         if (status < 0) {
2427                 dev_dbg(&port->dev, "Writing DCR1 failed status-0x%x\n", status);
2428                 goto out;
2429         } else
2430                 dev_dbg(&port->dev, "DCR1 Writing success status%d\n", status);
2431
2432         Data = 0x24;
2433         status = mos7840_set_reg_sync(port,
2434                         (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2435         if (status < 0) {
2436                 dev_dbg(&port->dev, "Writing DCR2 failed status-0x%x\n", status);
2437                 goto out;
2438         } else
2439                 dev_dbg(&port->dev, "DCR2 Writing success status%d\n", status);
2440
2441         /* write values in clkstart0x0 and clkmulti 0x20 */
2442         Data = 0x0;
2443         status = mos7840_set_reg_sync(port, CLK_START_VALUE_REGISTER, Data);
2444         if (status < 0) {
2445                 dev_dbg(&port->dev, "Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
2446                 goto out;
2447         } else
2448                 dev_dbg(&port->dev, "CLK_START_VALUE_REGISTER Writing success status%d\n", status);
2449
2450         Data = 0x20;
2451         status = mos7840_set_reg_sync(port, CLK_MULTI_REGISTER, Data);
2452         if (status < 0) {
2453                 dev_dbg(&port->dev, "Writing CLK_MULTI_REGISTER failed status-0x%x\n", status);
2454                 goto error;
2455         } else
2456                 dev_dbg(&port->dev, "CLK_MULTI_REGISTER Writing success status%d\n", status);
2457
2458         /* write value 0x0 to scratchpad register */
2459         Data = 0x00;
2460         status = mos7840_set_uart_reg(port, SCRATCH_PAD_REGISTER, Data);
2461         if (status < 0) {
2462                 dev_dbg(&port->dev, "Writing SCRATCH_PAD_REGISTER failed status-0x%x\n", status);
2463                 goto out;
2464         } else
2465                 dev_dbg(&port->dev, "SCRATCH_PAD_REGISTER Writing success status%d\n", status);
2466
2467         /* Zero Length flag register */
2468         if ((mos7840_port->port_num != 1) && (serial->num_ports == 2)) {
2469                 Data = 0xff;
2470                 status = mos7840_set_reg_sync(port,
2471                                 (__u16) (ZLP_REG1 +
2472                                         ((__u16)mos7840_port->port_num)), Data);
2473                 dev_dbg(&port->dev, "ZLIP offset %x\n",
2474                                 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num)));
2475                 if (status < 0) {
2476                         dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 2, status);
2477                         goto out;
2478                 } else
2479                         dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 2, status);
2480         } else {
2481                 Data = 0xff;
2482                 status = mos7840_set_reg_sync(port,
2483                                 (__u16) (ZLP_REG1 +
2484                                         ((__u16)mos7840_port->port_num) - 0x1), Data);
2485                 dev_dbg(&port->dev, "ZLIP offset %x\n",
2486                                 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num) - 0x1));
2487                 if (status < 0) {
2488                         dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 1, status);
2489                         goto out;
2490                 } else
2491                         dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 1, status);
2492
2493         }
2494         mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2495         mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2496         mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2497                         GFP_KERNEL);
2498         if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2499                         !mos7840_port->dr) {
2500                 status = -ENOMEM;
2501                 goto error;
2502         }
2503
2504         mos7840_port->has_led = false;
2505
2506         /* Initialize LED timers */
2507         if (device_type == MOSCHIP_DEVICE_ID_7810) {
2508                 mos7840_port->has_led = true;
2509
2510                 init_timer(&mos7840_port->led_timer1);
2511                 mos7840_port->led_timer1.function = mos7840_led_off;
2512                 mos7840_port->led_timer1.expires =
2513                         jiffies + msecs_to_jiffies(LED_ON_MS);
2514                 mos7840_port->led_timer1.data = (unsigned long)mos7840_port;
2515
2516                 init_timer(&mos7840_port->led_timer2);
2517                 mos7840_port->led_timer2.function = mos7840_led_flag_off;
2518                 mos7840_port->led_timer2.expires =
2519                         jiffies + msecs_to_jiffies(LED_OFF_MS);
2520                 mos7840_port->led_timer2.data = (unsigned long)mos7840_port;
2521
2522                 mos7840_port->led_flag = false;
2523
2524                 /* Turn off LED */
2525                 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2526         }
2527 out:
2528         if (pnum == serial->num_ports - 1) {
2529                 /* Zero Length flag enable */
2530                 Data = 0x0f;
2531                 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2532                 if (status < 0) {
2533                         dev_dbg(&port->dev, "Writing ZLP_REG5 failed status-0x%x\n", status);
2534                         goto error;
2535                 } else
2536                         dev_dbg(&port->dev, "ZLP_REG5 Writing success status%d\n", status);
2537
2538                 /* setting configuration feature to one */
2539                 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2540                                 0x03, 0x00, 0x01, 0x00, NULL, 0x00,
2541                                 MOS_WDR_TIMEOUT);
2542         }
2543         return 0;
2544 error:
2545         kfree(mos7840_port->dr);
2546         kfree(mos7840_port->ctrl_buf);
2547         usb_free_urb(mos7840_port->control_urb);
2548         kfree(mos7840_port);
2549
2550         return status;
2551 }
2552
2553 static int mos7840_port_remove(struct usb_serial_port *port)
2554 {
2555         struct moschip_port *mos7840_port;
2556
2557         mos7840_port = mos7840_get_port_private(port);
2558
2559         if (mos7840_port->has_led) {
2560                 /* Turn off LED */
2561                 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2562
2563                 del_timer_sync(&mos7840_port->led_timer1);
2564                 del_timer_sync(&mos7840_port->led_timer2);
2565         }
2566         usb_kill_urb(mos7840_port->control_urb);
2567         usb_free_urb(mos7840_port->control_urb);
2568         kfree(mos7840_port->ctrl_buf);
2569         kfree(mos7840_port->dr);
2570         kfree(mos7840_port);
2571
2572         return 0;
2573 }
2574
2575 static struct usb_serial_driver moschip7840_4port_device = {
2576         .driver = {
2577                    .owner = THIS_MODULE,
2578                    .name = "mos7840",
2579                    },
2580         .description = DRIVER_DESC,
2581         .id_table = id_table,
2582         .num_ports = 4,
2583         .open = mos7840_open,
2584         .close = mos7840_close,
2585         .write = mos7840_write,
2586         .write_room = mos7840_write_room,
2587         .chars_in_buffer = mos7840_chars_in_buffer,
2588         .throttle = mos7840_throttle,
2589         .unthrottle = mos7840_unthrottle,
2590         .calc_num_ports = mos7840_calc_num_ports,
2591 #ifdef MCSSerialProbe
2592         .probe = mos7840_serial_probe,
2593 #endif
2594         .ioctl = mos7840_ioctl,
2595         .set_termios = mos7840_set_termios,
2596         .break_ctl = mos7840_break,
2597         .tiocmget = mos7840_tiocmget,
2598         .tiocmset = mos7840_tiocmset,
2599         .get_icount = mos7840_get_icount,
2600         .port_probe = mos7840_port_probe,
2601         .port_remove = mos7840_port_remove,
2602         .read_bulk_callback = mos7840_bulk_in_callback,
2603         .read_int_callback = mos7840_interrupt_callback,
2604 };
2605
2606 static struct usb_serial_driver * const serial_drivers[] = {
2607         &moschip7840_4port_device, NULL
2608 };
2609
2610 module_usb_serial_driver(serial_drivers, id_table);
2611
2612 MODULE_DESCRIPTION(DRIVER_DESC);
2613 MODULE_LICENSE("GPL");