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