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 "1.3.1"
  42 #define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
  43
  44 /*
  45  * 16C50 UART register defines
  46  */
  47
  48 #define LCR_BITS_5             0x00     /* 5 bits/char */
  49 #define LCR_BITS_6             0x01     /* 6 bits/char */
  50 #define LCR_BITS_7             0x02     /* 7 bits/char */
  51 #define LCR_BITS_8             0x03     /* 8 bits/char */
  52 #define LCR_BITS_MASK          0x03     /* Mask for bits/char field */
  53
  54 #define LCR_STOP_1             0x00     /* 1 stop bit */
  55 #define LCR_STOP_1_5           0x04     /* 1.5 stop bits (if 5   bits/char) */
  56 #define LCR_STOP_2             0x04     /* 2 stop bits   (if 6-8 bits/char) */
  57 #define LCR_STOP_MASK          0x04     /* Mask for stop bits field */
  58
  59 #define LCR_PAR_NONE           0x00     /* No parity */
  60 #define LCR_PAR_ODD            0x08     /* Odd parity */
  61 #define LCR_PAR_EVEN           0x18     /* Even parity */
  62 #define LCR_PAR_MARK           0x28     /* Force parity bit to 1 */
  63 #define LCR_PAR_SPACE          0x38     /* Force parity bit to 0 */
  64 #define LCR_PAR_MASK           0x38     /* Mask for parity field */
  65
  66 #define LCR_SET_BREAK          0x40     /* Set Break condition */
  67 #define LCR_DL_ENABLE          0x80     /* Enable access to divisor latch */
  68
  69 #define MCR_DTR                0x01     /* Assert DTR */
  70 #define MCR_RTS                0x02     /* Assert RTS */
  71 #define MCR_OUT1               0x04     /* Loopback only: Sets state of RI */
  72 #define MCR_MASTER_IE          0x08     /* Enable interrupt outputs */
  73 #define MCR_LOOPBACK           0x10     /* Set internal (digital) loopback mode */
  74 #define MCR_XON_ANY            0x20     /* Enable any char to exit XOFF mode */
  75
  76 #define MOS7840_MSR_CTS        0x10     /* Current state of CTS */
  77 #define MOS7840_MSR_DSR        0x20     /* Current state of DSR */
  78 #define MOS7840_MSR_RI         0x40     /* Current state of RI */
  79 #define MOS7840_MSR_CD         0x80     /* Current state of CD */
  80
  81 /*
  82  * Defines used for sending commands to port
  83  */
  84
  85 #define WAIT_FOR_EVER   (HZ * 0)        /* timeout urb is wait for ever */
  86 #define MOS_WDR_TIMEOUT (HZ * 5)        /* default urb timeout */
  87
  88 #define MOS_PORT1       0x0200
  89 #define MOS_PORT2       0x0300
  90 #define MOS_VENREG      0x0000
  91 #define MOS_MAX_PORT    0x02
  92 #define MOS_WRITE       0x0E
  93 #define MOS_READ        0x0D
  94
  95 /* Requests */
  96 #define MCS_RD_RTYPE    0xC0
  97 #define MCS_WR_RTYPE    0x40
  98 #define MCS_RDREQ       0x0D
  99 #define MCS_WRREQ       0x0E
 100 #define MCS_CTRL_TIMEOUT        500
 101 #define VENDOR_READ_LENGTH      (0x01)
 102
 103 #define MAX_NAME_LEN    64
 104
 105 #define ZLP_REG1  0x3A          /* Zero_Flag_Reg1    58 */
 106 #define ZLP_REG5  0x3E          /* Zero_Flag_Reg5    62 */
 107
 108 /* For higher baud Rates use TIOCEXBAUD */
 109 #define TIOCEXBAUD     0x5462
 110
 111 /* vendor id and device id defines */
 112
 113 /* The native mos7840/7820 component */
 114 #define USB_VENDOR_ID_MOSCHIP           0x9710
 115 #define MOSCHIP_DEVICE_ID_7840          0x7840
 116 #define MOSCHIP_DEVICE_ID_7820          0x7820
 117 /* 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 moschip_port_id_table, and in
 120  * moschip_id_table_combined
 121  */
 122 #define USB_VENDOR_ID_BANDB             0x0856
 123 #define BANDB_DEVICE_ID_USOPTL4_4       0xAC44
 124 #define BANDB_DEVICE_ID_USOPTL4_2       0xAC42
 125
 126 /* Interrupt Routine Defines    */
 127
 128 #define SERIAL_IIR_RLS      0x06
 129 #define SERIAL_IIR_MS       0x00
 130
 131 /*
 132  *  Emulation of the bit mask on the LINE STATUS REGISTER.
 133  */
 134 #define SERIAL_LSR_DR       0x0001
 135 #define SERIAL_LSR_OE       0x0002
 136 #define SERIAL_LSR_PE       0x0004
 137 #define SERIAL_LSR_FE       0x0008
 138 #define SERIAL_LSR_BI       0x0010
 139
 140 #define MOS_MSR_DELTA_CTS   0x10
 141 #define MOS_MSR_DELTA_DSR   0x20
 142 #define MOS_MSR_DELTA_RI    0x40
 143 #define MOS_MSR_DELTA_CD    0x80
 144
 145 /* Serial Port register Address */
 146 #define INTERRUPT_ENABLE_REGISTER  ((__u16)(0x01))
 147 #define FIFO_CONTROL_REGISTER      ((__u16)(0x02))
 148 #define LINE_CONTROL_REGISTER      ((__u16)(0x03))
 149 #define MODEM_CONTROL_REGISTER     ((__u16)(0x04))
 150 #define LINE_STATUS_REGISTER       ((__u16)(0x05))
 151 #define MODEM_STATUS_REGISTER      ((__u16)(0x06))
 152 #define SCRATCH_PAD_REGISTER       ((__u16)(0x07))
 153 #define DIVISOR_LATCH_LSB          ((__u16)(0x00))
 154 #define DIVISOR_LATCH_MSB          ((__u16)(0x01))
 155
 156 #define CLK_MULTI_REGISTER         ((__u16)(0x02))
 157 #define CLK_START_VALUE_REGISTER   ((__u16)(0x03))
 158
 159 #define SERIAL_LCR_DLAB            ((__u16)(0x0080))
 160
 161 /*
 162  * URB POOL related defines
 163  */
 164 #define NUM_URBS                        16      /* URB Count */
 165 #define URB_TRANSFER_BUFFER_SIZE        32      /* URB Size  */
 166
 167
 168 static struct usb_device_id moschip_port_id_table[] = {
 169         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 170         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 171         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 172         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 173         {}                      /* terminating entry */
 174 };
 175
 176 static __devinitdata struct usb_device_id moschip_id_table_combined[] = {
 177         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
 178         {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
 179         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
 180         {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
 181         {}                      /* terminating entry */
 182 };
 183
 184 MODULE_DEVICE_TABLE(usb, moschip_id_table_combined);
 185
 186 /* This structure holds all of the local port information */
 187
 188 struct moschip_port {
 189         int port_num;           /*Actual port number in the device(1,2,etc) */
 190         struct urb *write_urb;  /* write URB for this port */
 191         struct urb *read_urb;   /* read URB for this port */
 192         struct urb *int_urb;
 193         __u8 shadowLCR;         /* last LCR value received */
 194         __u8 shadowMCR;         /* last MCR value received */
 195         char open;
 196         char open_ports;
 197         char zombie;
 198         wait_queue_head_t wait_chase;   /* for handling sleeping while waiting for chase to finish */
 199         wait_queue_head_t delta_msr_wait;       /* for handling sleeping while waiting for msr change to happen */
 200         int delta_msr_cond;
 201         struct async_icount icount;
 202         struct usb_serial_port *port;   /* loop back to the owner of this object */
 203
 204         /* Offsets */
 205         __u8 SpRegOffset;
 206         __u8 ControlRegOffset;
 207         __u8 DcrRegOffset;
 208         /* for processing control URBS in interrupt context */
 209         struct urb *control_urb;
 210         struct usb_ctrlrequest *dr;
 211         char *ctrl_buf;
 212         int MsrLsr;
 213
 214         spinlock_t pool_lock;
 215         struct urb *write_urb_pool[NUM_URBS];
 216         char busy[NUM_URBS];
 217 };
 218
 219
 220 static int debug;
 221
 222 /*
 223  * mos7840_set_reg_sync
 224  *      To set the Control register by calling usb_fill_control_urb function
 225  *      by passing usb_sndctrlpipe function as parameter.
 226  */
 227
 228 static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
 229                                 __u16 val)
 230 {
 231         struct usb_device *dev = port->serial->dev;
 232         val = val & 0x00ff;
 233         dbg("mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
 234
 235         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 236                                MCS_WR_RTYPE, val, reg, NULL, 0,
 237                                MOS_WDR_TIMEOUT);
 238 }
 239
 240 /*
 241  * mos7840_get_reg_sync
 242  *      To set the Uart register by calling usb_fill_control_urb function by
 243  *      passing usb_rcvctrlpipe function as parameter.
 244  */
 245
 246 static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
 247                                 __u16 *val)
 248 {
 249         struct usb_device *dev = port->serial->dev;
 250         int ret = 0;
 251
 252         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 253                               MCS_RD_RTYPE, 0, reg, val, VENDOR_READ_LENGTH,
 254                               MOS_WDR_TIMEOUT);
 255         dbg("mos7840_get_reg_sync offset is %x, return val %x\n", reg, *val);
 256         *val = (*val) & 0x00ff;
 257         return ret;
 258 }
 259
 260 /*
 261  * mos7840_set_uart_reg
 262  *      To set the Uart register by calling usb_fill_control_urb function by
 263  *      passing usb_sndctrlpipe function as parameter.
 264  */
 265
 266 static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
 267                                 __u16 val)
 268 {
 269
 270         struct usb_device *dev = port->serial->dev;
 271         val = val & 0x00ff;
 272         /* For the UART control registers, the application number need
 273            to be Or'ed */
 274         if (port->serial->num_ports == 4) {
 275                 val |= (((__u16) port->number -
 276                                 (__u16) (port->serial->minor)) + 1) << 8;
 277                 dbg("mos7840_set_uart_reg application number is %x\n", val);
 278         } else {
 279                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 280                         val |= (((__u16) port->number -
 281                               (__u16) (port->serial->minor)) + 1) << 8;
 282                         dbg("mos7840_set_uart_reg application number is %x\n",
 283                             val);
 284                 } else {
 285                         val |=
 286                             (((__u16) port->number -
 287                               (__u16) (port->serial->minor)) + 2) << 8;
 288                         dbg("mos7840_set_uart_reg application number is %x\n",
 289                             val);
 290                 }
 291         }
 292         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 293                                MCS_WR_RTYPE, val, reg, NULL, 0,
 294                                MOS_WDR_TIMEOUT);
 295
 296 }
 297
 298 /*
 299  * mos7840_get_uart_reg
 300  *      To set the Control register by calling usb_fill_control_urb function
 301  *      by passing usb_rcvctrlpipe function as parameter.
 302  */
 303 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
 304                                 __u16 *val)
 305 {
 306         struct usb_device *dev = port->serial->dev;
 307         int ret = 0;
 308         __u16 Wval;
 309
 310         /* dbg("application number is %4x \n",
 311             (((__u16)port->number - (__u16)(port->serial->minor))+1)<<8); */
 312         /* Wval  is same as application number */
 313         if (port->serial->num_ports == 4) {
 314                 Wval =
 315                     (((__u16) port->number - (__u16) (port->serial->minor)) +
 316                      1) << 8;
 317                 dbg("mos7840_get_uart_reg application number is %x\n", Wval);
 318         } else {
 319                 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
 320                         Wval = (((__u16) port->number -
 321                               (__u16) (port->serial->minor)) + 1) << 8;
 322                         dbg("mos7840_get_uart_reg application number is %x\n",
 323                             Wval);
 324                 } else {
 325                         Wval = (((__u16) port->number -
 326                               (__u16) (port->serial->minor)) + 2) << 8;
 327                         dbg("mos7840_get_uart_reg application number is %x\n",
 328                             Wval);
 329                 }
 330         }
 331         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 332                               MCS_RD_RTYPE, Wval, reg, val, VENDOR_READ_LENGTH,
 333                               MOS_WDR_TIMEOUT);
 334         *val = (*val) & 0x00ff;
 335         return ret;
 336 }
 337
 338 static void mos7840_dump_serial_port(struct moschip_port *mos7840_port)
 339 {
 340
 341         dbg("***************************************\n");
 342         dbg("SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
 343         dbg("ControlRegOffset is %2x \n", mos7840_port->ControlRegOffset);
 344         dbg("DCRRegOffset is %2x \n", mos7840_port->DcrRegOffset);
 345         dbg("***************************************\n");
 346
 347 }
 348
 349 /************************************************************************/
 350 /************************************************************************/
 351 /*             I N T E R F A C E   F U N C T I O N S                    */
 352 /*             I N T E R F A C E   F U N C T I O N S                    */
 353 /************************************************************************/
 354 /************************************************************************/
 355
 356 static inline void mos7840_set_port_private(struct usb_serial_port *port,
 357                                             struct moschip_port *data)
 358 {
 359         usb_set_serial_port_data(port, (void *)data);
 360 }
 361
 362 static inline struct moschip_port *mos7840_get_port_private(struct
 363                                                             usb_serial_port
 364                                                             *port)
 365 {
 366         return (struct moschip_port *)usb_get_serial_port_data(port);
 367 }
 368
 369 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
 370 {
 371         struct moschip_port *mos7840_port;
 372         struct async_icount *icount;
 373         mos7840_port = port;
 374         icount = &mos7840_port->icount;
 375         if (new_msr &
 376             (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
 377              MOS_MSR_DELTA_CD)) {
 378                 icount = &mos7840_port->icount;
 379
 380                 /* update input line counters */
 381                 if (new_msr & MOS_MSR_DELTA_CTS) {
 382                         icount->cts++;
 383                         smp_wmb();
 384                 }
 385                 if (new_msr & MOS_MSR_DELTA_DSR) {
 386                         icount->dsr++;
 387                         smp_wmb();
 388                 }
 389                 if (new_msr & MOS_MSR_DELTA_CD) {
 390                         icount->dcd++;
 391                         smp_wmb();
 392                 }
 393                 if (new_msr & MOS_MSR_DELTA_RI) {
 394                         icount->rng++;
 395                         smp_wmb();
 396                 }
 397         }
 398 }
 399
 400 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
 401 {
 402         struct async_icount *icount;
 403
 404         dbg("%s - %02x", __func__, new_lsr);
 405
 406         if (new_lsr & SERIAL_LSR_BI) {
 407                 /*
 408                  * Parity and Framing errors only count if they
 409                  * occur exclusive of a break being
 410                  * received.
 411                  */
 412                 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
 413         }
 414
 415         /* update input line counters */
 416         icount = &port->icount;
 417         if (new_lsr & SERIAL_LSR_BI) {
 418                 icount->brk++;
 419                 smp_wmb();
 420         }
 421         if (new_lsr & SERIAL_LSR_OE) {
 422                 icount->overrun++;
 423                 smp_wmb();
 424         }
 425         if (new_lsr & SERIAL_LSR_PE) {
 426                 icount->parity++;
 427                 smp_wmb();
 428         }
 429         if (new_lsr & SERIAL_LSR_FE) {
 430                 icount->frame++;
 431                 smp_wmb();
 432         }
 433 }
 434
 435 /************************************************************************/
 436 /************************************************************************/
 437 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 438 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 439 /************************************************************************/
 440 /************************************************************************/
 441
 442 static void mos7840_control_callback(struct urb *urb)
 443 {
 444         unsigned char *data;
 445         struct moschip_port *mos7840_port;
 446         __u8 regval = 0x0;
 447         int result = 0;
 448         int status = urb->status;
 449
 450         mos7840_port = urb->context;
 451
 452         switch (status) {
 453         case 0:
 454                 /* success */
 455                 break;
 456         case -ECONNRESET:
 457         case -ENOENT:
 458         case -ESHUTDOWN:
 459                 /* this urb is terminated, clean up */
 460                 dbg("%s - urb shutting down with status: %d", __func__,
 461                     status);
 462                 return;
 463         default:
 464                 dbg("%s - nonzero urb status received: %d", __func__,
 465                     status);
 466                 goto exit;
 467         }
 468
 469         dbg("%s urb buffer size is %d\n", __func__, urb->actual_length);
 470         dbg("%s mos7840_port->MsrLsr is %d port %d\n", __func__,
 471             mos7840_port->MsrLsr, mos7840_port->port_num);
 472         data = urb->transfer_buffer;
 473         regval = (__u8) data[0];
 474         dbg("%s data is %x\n", __func__, regval);
 475         if (mos7840_port->MsrLsr == 0)
 476                 mos7840_handle_new_msr(mos7840_port, regval);
 477         else if (mos7840_port->MsrLsr == 1)
 478                 mos7840_handle_new_lsr(mos7840_port, regval);
 479
 480 exit:
 481         spin_lock(&mos7840_port->pool_lock);
 482         if (!mos7840_port->zombie)
 483                 result = usb_submit_urb(mos7840_port->int_urb, GFP_ATOMIC);
 484         spin_unlock(&mos7840_port->pool_lock);
 485         if (result) {
 486                 dev_err(&urb->dev->dev,
 487                         "%s - Error %d submitting interrupt urb\n",
 488                         __func__, result);
 489         }
 490 }
 491
 492 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
 493                            __u16 *val)
 494 {
 495         struct usb_device *dev = mcs->port->serial->dev;
 496         struct usb_ctrlrequest *dr = mcs->dr;
 497         unsigned char *buffer = mcs->ctrl_buf;
 498         int ret;
 499
 500         dr->bRequestType = MCS_RD_RTYPE;
 501         dr->bRequest = MCS_RDREQ;
 502         dr->wValue = cpu_to_le16(Wval); /* 0 */
 503         dr->wIndex = cpu_to_le16(reg);
 504         dr->wLength = cpu_to_le16(2);
 505
 506         usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
 507                              (unsigned char *)dr, buffer, 2,
 508                              mos7840_control_callback, mcs);
 509         mcs->control_urb->transfer_buffer_length = 2;
 510         ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 511         return ret;
 512 }
 513
 514 /*****************************************************************************
 515  * mos7840_interrupt_callback
 516  *      this is the callback function for when we have received data on the
 517  *      interrupt endpoint.
 518  *****************************************************************************/
 519
 520 static void mos7840_interrupt_callback(struct urb *urb)
 521 {
 522         int result;
 523         int length;
 524         struct moschip_port *mos7840_port;
 525         struct usb_serial *serial;
 526         __u16 Data;
 527         unsigned char *data;
 528         __u8 sp[5], st;
 529         int i, rv = 0;
 530         __u16 wval, wreg = 0;
 531         int status = urb->status;
 532
 533         dbg("%s", " : Entering\n");
 534
 535         switch (status) {
 536         case 0:
 537                 /* success */
 538                 break;
 539         case -ECONNRESET:
 540         case -ENOENT:
 541         case -ESHUTDOWN:
 542                 /* this urb is terminated, clean up */
 543                 dbg("%s - urb shutting down with status: %d", __func__,
 544                     status);
 545                 return;
 546         default:
 547                 dbg("%s - nonzero urb status received: %d", __func__,
 548                     status);
 549                 goto exit;
 550         }
 551
 552         length = urb->actual_length;
 553         data = urb->transfer_buffer;
 554
 555         serial = urb->context;
 556
 557         /* Moschip get 5 bytes
 558          * Byte 1 IIR Port 1 (port.number is 0)
 559          * Byte 2 IIR Port 2 (port.number is 1)
 560          * Byte 3 IIR Port 3 (port.number is 2)
 561          * Byte 4 IIR Port 4 (port.number is 3)
 562          * Byte 5 FIFO status for both */
 563
 564         if (length && length > 5) {
 565                 dbg("%s \n", "Wrong data !!!");
 566                 return;
 567         }
 568
 569         sp[0] = (__u8) data[0];
 570         sp[1] = (__u8) data[1];
 571         sp[2] = (__u8) data[2];
 572         sp[3] = (__u8) data[3];
 573         st = (__u8) data[4];
 574
 575         for (i = 0; i < serial->num_ports; i++) {
 576                 mos7840_port = mos7840_get_port_private(serial->port[i]);
 577                 wval =
 578                     (((__u16) serial->port[i]->number -
 579                       (__u16) (serial->minor)) + 1) << 8;
 580                 if (mos7840_port->open) {
 581                         if (sp[i] & 0x01) {
 582                                 dbg("SP%d No Interrupt !!!\n", i);
 583                         } else {
 584                                 switch (sp[i] & 0x0f) {
 585                                 case SERIAL_IIR_RLS:
 586                                         dbg("Serial Port %d: Receiver status error or ", i);
 587                                         dbg("address bit detected in 9-bit mode\n");
 588                                         mos7840_port->MsrLsr = 1;
 589                                         wreg = LINE_STATUS_REGISTER;
 590                                         break;
 591                                 case SERIAL_IIR_MS:
 592                                         dbg("Serial Port %d: Modem status change\n", i);
 593                                         mos7840_port->MsrLsr = 0;
 594                                         wreg = MODEM_STATUS_REGISTER;
 595                                         break;
 596                                 }
 597                                 spin_lock(&mos7840_port->pool_lock);
 598                                 if (!mos7840_port->zombie) {
 599                                         rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
 600                                 } else {
 601                                         spin_unlock(&mos7840_port->pool_lock);
 602                                         return;
 603                                 }
 604                                 spin_unlock(&mos7840_port->pool_lock);
 605                         }
 606                 }
 607         }
 608         if (!(rv < 0))
 609                 /* the completion handler for the control urb will resubmit */
 610                 return;
 611 exit:
 612         result = usb_submit_urb(urb, GFP_ATOMIC);
 613         if (result) {
 614                 dev_err(&urb->dev->dev,
 615                         "%s - Error %d submitting interrupt urb\n",
 616                         __func__, result);
 617         }
 618 }
 619
 620 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
 621                                        const char *function)
 622 {
 623         if (!port) {
 624                 dbg("%s - port == NULL", function);
 625                 return -1;
 626         }
 627         if (!port->serial) {
 628                 dbg("%s - port->serial == NULL", function);
 629                 return -1;
 630         }
 631
 632         return 0;
 633 }
 634
 635 /* Inline functions to check the sanity of a pointer that is passed to us */
 636 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
 637                                          const char *function)
 638 {
 639         if (!serial) {
 640                 dbg("%s - serial == NULL", function);
 641                 return -1;
 642         }
 643         if (!serial->type) {
 644                 dbg("%s - serial->type == NULL!", function);
 645                 return -1;
 646         }
 647
 648         return 0;
 649 }
 650
 651 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
 652                                                  const char *function)
 653 {
 654         /* if no port was specified, or it fails a paranoia check */
 655         if (!port ||
 656             mos7840_port_paranoia_check(port, function) ||
 657             mos7840_serial_paranoia_check(port->serial, function)) {
 658                 /* then say that we don't have a valid usb_serial thing,
 659                  * which will end up genrating -ENODEV return values */
 660                 return NULL;
 661         }
 662
 663         return port->serial;
 664 }
 665
 666 /*****************************************************************************
 667  * mos7840_bulk_in_callback
 668  *      this is the callback function for when we have received data on the
 669  *      bulk in endpoint.
 670  *****************************************************************************/
 671
 672 static void mos7840_bulk_in_callback(struct urb *urb)
 673 {
 674         int retval;
 675         unsigned char *data;
 676         struct usb_serial *serial;
 677         struct usb_serial_port *port;
 678         struct moschip_port *mos7840_port;
 679         struct tty_struct *tty;
 680         int status = urb->status;
 681
 682         if (status) {
 683                 dbg("nonzero read bulk status received: %d", status);
 684                 return;
 685         }
 686
 687         mos7840_port = urb->context;
 688         if (!mos7840_port) {
 689                 dbg("%s", "NULL mos7840_port pointer \n");
 690                 return;
 691         }
 692
 693         port = (struct usb_serial_port *)mos7840_port->port;
 694         if (mos7840_port_paranoia_check(port, __func__)) {
 695                 dbg("%s", "Port Paranoia failed \n");
 696                 return;
 697         }
 698
 699         serial = mos7840_get_usb_serial(port, __func__);
 700         if (!serial) {
 701                 dbg("%s\n", "Bad serial pointer ");
 702                 return;
 703         }
 704
 705         dbg("%s\n", "Entering... \n");
 706
 707         data = urb->transfer_buffer;
 708
 709         dbg("%s", "Entering ........... \n");
 710
 711         if (urb->actual_length) {
 712                 tty = tty_port_tty_get(&mos7840_port->port->port);
 713                 if (tty) {
 714                         tty_buffer_request_room(tty, urb->actual_length);
 715                         tty_insert_flip_string(tty, data, urb->actual_length);
 716                         dbg(" %s \n", data);
 717                         tty_flip_buffer_push(tty);
 718                         tty_kref_put(tty);
 719                 }
 720                 mos7840_port->icount.rx += urb->actual_length;
 721                 smp_wmb();
 722                 dbg("mos7840_port->icount.rx is %d:\n",
 723                     mos7840_port->icount.rx);
 724         }
 725
 726         if (!mos7840_port->read_urb) {
 727                 dbg("%s", "URB KILLED !!!\n");
 728                 return;
 729         }
 730
 731
 732         mos7840_port->read_urb->dev = serial->dev;
 733
 734         retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
 735
 736         if (retval) {
 737                 dbg(" usb_submit_urb(read bulk) failed, retval = %d",
 738                  retval);
 739         }
 740 }
 741
 742 /*****************************************************************************
 743  * mos7840_bulk_out_data_callback
 744  *      this is the callback function for when we have finished sending
 745  *      serial data on the bulk out endpoint.
 746  *****************************************************************************/
 747
 748 static void mos7840_bulk_out_data_callback(struct urb *urb)
 749 {
 750         struct moschip_port *mos7840_port;
 751         struct tty_struct *tty;
 752         int status = urb->status;
 753         int i;
 754
 755         mos7840_port = urb->context;
 756         spin_lock(&mos7840_port->pool_lock);
 757         for (i = 0; i < NUM_URBS; i++) {
 758                 if (urb == mos7840_port->write_urb_pool[i]) {
 759                         mos7840_port->busy[i] = 0;
 760                         break;
 761                 }
 762         }
 763         spin_unlock(&mos7840_port->pool_lock);
 764
 765         if (status) {
 766                 dbg("nonzero write bulk status received:%d\n", status);
 767                 return;
 768         }
 769
 770         if (mos7840_port_paranoia_check(mos7840_port->port, __func__)) {
 771                 dbg("%s", "Port Paranoia failed \n");
 772                 return;
 773         }
 774
 775         dbg("%s \n", "Entering .........");
 776
 777         tty = tty_port_tty_get(&mos7840_port->port->port);
 778         if (tty && mos7840_port->open)
 779                 tty_wakeup(tty);
 780         tty_kref_put(tty);
 781
 782 }
 783
 784 /************************************************************************/
 785 /*       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       */
 786 /************************************************************************/
 787 #ifdef MCSSerialProbe
 788 static int mos7840_serial_probe(struct usb_serial *serial,
 789                                 const struct usb_device_id *id)
 790 {
 791
 792         /*need to implement the mode_reg reading and updating\
 793            structures usb_serial_ device_type\
 794            (i.e num_ports, num_bulkin,bulkout etc) */
 795         /* Also we can update the changes  attach */
 796         return 1;
 797 }
 798 #endif
 799
 800 /*****************************************************************************
 801  * mos7840_open
 802  *      this function is called by the tty driver when a port is opened
 803  *      If successful, we return 0
 804  *      Otherwise we return a negative error number.
 805  *****************************************************************************/
 806
 807 static int mos7840_open(struct tty_struct *tty,
 808                         struct usb_serial_port *port, struct file *filp)
 809 {
 810         int response;
 811         int j;
 812         struct usb_serial *serial;
 813         struct urb *urb;
 814         __u16 Data;
 815         int status;
 816         struct moschip_port *mos7840_port;
 817         struct moschip_port *port0;
 818
 819         if (mos7840_port_paranoia_check(port, __func__)) {
 820                 dbg("%s", "Port Paranoia failed \n");
 821                 return -ENODEV;
 822         }
 823
 824         serial = port->serial;
 825
 826         if (mos7840_serial_paranoia_check(serial, __func__)) {
 827                 dbg("%s", "Serial Paranoia failed \n");
 828                 return -ENODEV;
 829         }
 830
 831         mos7840_port = mos7840_get_port_private(port);
 832         port0 = mos7840_get_port_private(serial->port[0]);
 833
 834         if (mos7840_port == NULL || port0 == NULL)
 835                 return -ENODEV;
 836
 837         usb_clear_halt(serial->dev, port->write_urb->pipe);
 838         usb_clear_halt(serial->dev, port->read_urb->pipe);
 839         port0->open_ports++;
 840
 841         /* Initialising the write urb pool */
 842         for (j = 0; j < NUM_URBS; ++j) {
 843                 urb = usb_alloc_urb(0, GFP_KERNEL);
 844                 mos7840_port->write_urb_pool[j] = urb;
 845
 846                 if (urb == NULL) {
 847                         err("No more urbs???");
 848                         continue;
 849                 }
 850
 851                 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
 852                                                                 GFP_KERNEL);
 853                 if (!urb->transfer_buffer) {
 854                         usb_free_urb(urb);
 855                         mos7840_port->write_urb_pool[j] = NULL;
 856                         err("%s-out of memory for urb buffers.", __func__);
 857                         continue;
 858                 }
 859         }
 860
 861 /*****************************************************************************
 862  * Initialize MCS7840 -- Write Init values to corresponding Registers
 863  *
 864  * Register Index
 865  * 1 : IER
 866  * 2 : FCR
 867  * 3 : LCR
 868  * 4 : MCR
 869  *
 870  * 0x08 : SP1/2 Control Reg
 871  *****************************************************************************/
 872
 873         /* NEED to check the following Block */
 874
 875         Data = 0x0;
 876         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 877         if (status < 0) {
 878                 dbg("Reading Spreg failed\n");
 879                 return -1;
 880         }
 881         Data |= 0x80;
 882         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 883         if (status < 0) {
 884                 dbg("writing Spreg failed\n");
 885                 return -1;
 886         }
 887
 888         Data &= ~0x80;
 889         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 890         if (status < 0) {
 891                 dbg("writing Spreg failed\n");
 892                 return -1;
 893         }
 894         /* End of block to be checked */
 895
 896         Data = 0x0;
 897         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
 898                                                                         &Data);
 899         if (status < 0) {
 900                 dbg("Reading Controlreg failed\n");
 901                 return -1;
 902         }
 903         Data |= 0x08;           /* Driver done bit */
 904         Data |= 0x20;           /* rx_disable */
 905         status = mos7840_set_reg_sync(port,
 906                                 mos7840_port->ControlRegOffset, Data);
 907         if (status < 0) {
 908                 dbg("writing Controlreg failed\n");
 909                 return -1;
 910         }
 911         /* do register settings here */
 912         /* Set all regs to the device default values. */
 913         /***********************************
 914          * First Disable all interrupts.
 915          ***********************************/
 916         Data = 0x00;
 917         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 918         if (status < 0) {
 919                 dbg("disableing interrupts failed\n");
 920                 return -1;
 921         }
 922         /* Set FIFO_CONTROL_REGISTER to the default value */
 923         Data = 0x00;
 924         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 925         if (status < 0) {
 926                 dbg("Writing FIFO_CONTROL_REGISTER  failed\n");
 927                 return -1;
 928         }
 929
 930         Data = 0xcf;
 931         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 932         if (status < 0) {
 933                 dbg("Writing FIFO_CONTROL_REGISTER  failed\n");
 934                 return -1;
 935         }
 936
 937         Data = 0x03;
 938         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 939         mos7840_port->shadowLCR = Data;
 940
 941         Data = 0x0b;
 942         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
 943         mos7840_port->shadowMCR = Data;
 944
 945         Data = 0x00;
 946         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 947         mos7840_port->shadowLCR = Data;
 948
 949         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
 950         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 951
 952         Data = 0x0c;
 953         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
 954
 955         Data = 0x0;
 956         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
 957
 958         Data = 0x00;
 959         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 960
 961         Data = Data & ~SERIAL_LCR_DLAB;
 962         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 963         mos7840_port->shadowLCR = Data;
 964
 965         /* clearing Bulkin and Bulkout Fifo */
 966         Data = 0x0;
 967         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 968
 969         Data = Data | 0x0c;
 970         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 971
 972         Data = Data & ~0x0c;
 973         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 974         /* Finally enable all interrupts */
 975         Data = 0x0c;
 976         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 977
 978         /* clearing rx_disable */
 979         Data = 0x0;
 980         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
 981                                                                         &Data);
 982         Data = Data & ~0x20;
 983         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
 984                                                                         Data);
 985
 986         /* rx_negate */
 987         Data = 0x0;
 988         status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
 989                                                                         &Data);
 990         Data = Data | 0x10;
 991         status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
 992                                                                         Data);
 993
 994         /* force low_latency on so that our tty_push actually forces *
 995          * the data through,otherwise it is scheduled, and with      *
 996          * high data rates (like with OHCI) data can get lost.       */
 997         if (tty)
 998                 tty->low_latency = 1;
 999
1000         /* Check to see if we've set up our endpoint info yet    *
1001          * (can't set it up in mos7840_startup as the structures *
1002          * were not set up at that time.)                        */
1003         if (port0->open_ports == 1) {
1004                 if (serial->port[0]->interrupt_in_buffer == NULL) {
1005                         /* set up interrupt urb */
1006                         usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1007                                 serial->dev,
1008                                 usb_rcvintpipe(serial->dev,
1009                                 serial->port[0]->interrupt_in_endpointAddress),
1010                                 serial->port[0]->interrupt_in_buffer,
1011                                 serial->port[0]->interrupt_in_urb->
1012                                 transfer_buffer_length,
1013                                 mos7840_interrupt_callback,
1014                                 serial,
1015                                 serial->port[0]->interrupt_in_urb->interval);
1016
1017                         /* start interrupt read for mos7840               *
1018                          * will continue as long as mos7840 is connected  */
1019
1020                         response =
1021                             usb_submit_urb(serial->port[0]->interrupt_in_urb,
1022                                            GFP_KERNEL);
1023                         if (response) {
1024                                 err("%s - Error %d submitting interrupt urb",
1025                                     __func__, response);
1026                         }
1027
1028                 }
1029
1030         }
1031
1032         /* see if we've set up our endpoint info yet   *
1033          * (can't set it up in mos7840_startup as the  *
1034          * structures were not set up at that time.)   */
1035
1036         dbg("port number is %d \n", port->number);
1037         dbg("serial number is %d \n", port->serial->minor);
1038         dbg("Bulkin endpoint is %d \n", port->bulk_in_endpointAddress);
1039         dbg("BulkOut endpoint is %d \n", port->bulk_out_endpointAddress);
1040         dbg("Interrupt endpoint is %d \n", port->interrupt_in_endpointAddress);
1041         dbg("port's number in the device is %d\n", mos7840_port->port_num);
1042         mos7840_port->read_urb = port->read_urb;
1043
1044         /* set up our bulk in urb */
1045
1046         usb_fill_bulk_urb(mos7840_port->read_urb,
1047                           serial->dev,
1048                           usb_rcvbulkpipe(serial->dev,
1049                                           port->bulk_in_endpointAddress),
1050                           port->bulk_in_buffer,
1051                           mos7840_port->read_urb->transfer_buffer_length,
1052                           mos7840_bulk_in_callback, mos7840_port);
1053
1054         dbg("mos7840_open: bulkin endpoint is %d\n",
1055             port->bulk_in_endpointAddress);
1056         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1057         if (response) {
1058                 err("%s - Error %d submitting control urb", __func__,
1059                     response);
1060         }
1061
1062         /* initialize our wait queues */
1063         init_waitqueue_head(&mos7840_port->wait_chase);
1064         init_waitqueue_head(&mos7840_port->delta_msr_wait);
1065
1066         /* initialize our icount structure */
1067         memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1068
1069         /* initialize our port settings */
1070         /* Must set to enable ints! */
1071         mos7840_port->shadowMCR = MCR_MASTER_IE;
1072         /* send a open port command */
1073         mos7840_port->open = 1;
1074         /* mos7840_change_port_settings(mos7840_port,old_termios); */
1075         mos7840_port->icount.tx = 0;
1076         mos7840_port->icount.rx = 0;
1077
1078         dbg("\n\nusb_serial serial:%p       mos7840_port:%p\n      usb_serial_port port:%p\n\n",
1079                                 serial, mos7840_port, port);
1080
1081         return 0;
1082
1083 }
1084
1085 /*****************************************************************************
1086  * mos7840_chars_in_buffer
1087  *      this function is called by the tty driver when it wants to know how many
1088  *      bytes of data we currently have outstanding in the port (data that has
1089  *      been written, but hasn't made it out the port yet)
1090  *      If successful, we return the number of bytes left to be written in the
1091  *      system,
1092  *      Otherwise we return zero.
1093  *****************************************************************************/
1094
1095 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1096 {
1097         struct usb_serial_port *port = tty->driver_data;
1098         int i;
1099         int chars = 0;
1100         unsigned long flags;
1101         struct moschip_port *mos7840_port;
1102
1103         dbg("%s \n", " mos7840_chars_in_buffer:entering ...........");
1104
1105         if (mos7840_port_paranoia_check(port, __func__)) {
1106                 dbg("%s", "Invalid port \n");
1107                 return 0;
1108         }
1109
1110         mos7840_port = mos7840_get_port_private(port);
1111         if (mos7840_port == NULL) {
1112                 dbg("%s \n", "mos7840_break:leaving ...........");
1113                 return 0;
1114         }
1115
1116         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1117         for (i = 0; i < NUM_URBS; ++i)
1118                 if (mos7840_port->busy[i])
1119                         chars += URB_TRANSFER_BUFFER_SIZE;
1120         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1121         dbg("%s - returns %d", __func__, chars);
1122         return chars;
1123
1124 }
1125
1126 /************************************************************************
1127  *
1128  * mos7840_block_until_tx_empty
1129  *
1130  *      This function will block the close until one of the following:
1131  *              1. TX count are 0
1132  *              2. The mos7840 has stopped
1133  *              3. A timeout of 3 seconds without activity has expired
1134  *
1135  ************************************************************************/
1136 static void mos7840_block_until_tx_empty(struct tty_struct *tty,
1137                                 struct moschip_port *mos7840_port)
1138 {
1139         int timeout = HZ / 10;
1140         int wait = 30;
1141         int count;
1142
1143         while (1) {
1144
1145                 count = mos7840_chars_in_buffer(tty);
1146
1147                 /* Check for Buffer status */
1148                 if (count <= 0)
1149                         return;
1150
1151                 /* Block the thread for a while */
1152                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1153                                                timeout);
1154
1155                 /* No activity.. count down section */
1156                 wait--;
1157                 if (wait == 0) {
1158                         dbg("%s - TIMEOUT", __func__);
1159                         return;
1160                 } else {
1161                         /* Reset timeout value back to seconds */
1162                         wait = 30;
1163                 }
1164         }
1165 }
1166
1167 /*****************************************************************************
1168  * mos7840_close
1169  *      this function is called by the tty driver when a port is closed
1170  *****************************************************************************/
1171
1172 static void mos7840_close(struct tty_struct *tty,
1173                         struct usb_serial_port *port, struct file *filp)
1174 {
1175         struct usb_serial *serial;
1176         struct moschip_port *mos7840_port;
1177         struct moschip_port *port0;
1178         int j;
1179         __u16 Data;
1180
1181         dbg("%s\n", "mos7840_close:entering...");
1182
1183         if (mos7840_port_paranoia_check(port, __func__)) {
1184                 dbg("%s", "Port Paranoia failed \n");
1185                 return;
1186         }
1187
1188         serial = mos7840_get_usb_serial(port, __func__);
1189         if (!serial) {
1190                 dbg("%s", "Serial Paranoia failed \n");
1191                 return;
1192         }
1193
1194         mos7840_port = mos7840_get_port_private(port);
1195         port0 = mos7840_get_port_private(serial->port[0]);
1196
1197         if (mos7840_port == NULL || port0 == NULL)
1198                 return;
1199
1200         for (j = 0; j < NUM_URBS; ++j)
1201                 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1202
1203         /* Freeing Write URBs */
1204         for (j = 0; j < NUM_URBS; ++j) {
1205                 if (mos7840_port->write_urb_pool[j]) {
1206                         if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1207                                 kfree(mos7840_port->write_urb_pool[j]->
1208                                       transfer_buffer);
1209
1210                         usb_free_urb(mos7840_port->write_urb_pool[j]);
1211                 }
1212         }
1213
1214         if (serial->dev)
1215                 /* flush and block until tx is empty */
1216                 mos7840_block_until_tx_empty(tty, mos7840_port);
1217
1218         /* While closing port, shutdown all bulk read, write  *
1219          * and interrupt read if they exists                  */
1220         if (serial->dev) {
1221                 if (mos7840_port->write_urb) {
1222                         dbg("%s", "Shutdown bulk write\n");
1223                         usb_kill_urb(mos7840_port->write_urb);
1224                 }
1225                 if (mos7840_port->read_urb) {
1226                         dbg("%s", "Shutdown bulk read\n");
1227                         usb_kill_urb(mos7840_port->read_urb);
1228                 }
1229                 if ((&mos7840_port->control_urb)) {
1230                         dbg("%s", "Shutdown control read\n");
1231                         /*/      usb_kill_urb (mos7840_port->control_urb); */
1232                 }
1233         }
1234 /*      if(mos7840_port->ctrl_buf != NULL) */
1235 /*              kfree(mos7840_port->ctrl_buf); */
1236         port0->open_ports--;
1237         dbg("mos7840_num_open_ports in close%d:in port%d\n",
1238             port0->open_ports, port->number);
1239         if (port0->open_ports == 0) {
1240                 if (serial->port[0]->interrupt_in_urb) {
1241                         dbg("%s", "Shutdown interrupt_in_urb\n");
1242                         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1243                 }
1244         }
1245
1246         if (mos7840_port->write_urb) {
1247                 /* if this urb had a transfer buffer already (old tx) free it */
1248                 if (mos7840_port->write_urb->transfer_buffer != NULL)
1249                         kfree(mos7840_port->write_urb->transfer_buffer);
1250                 usb_free_urb(mos7840_port->write_urb);
1251         }
1252
1253         Data = 0x0;
1254         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1255
1256         Data = 0x00;
1257         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1258
1259         mos7840_port->open = 0;
1260
1261         dbg("%s \n", "Leaving ............");
1262 }
1263
1264 /************************************************************************
1265  *
1266  * mos7840_block_until_chase_response
1267  *
1268  *      This function will block the close until one of the following:
1269  *              1. Response to our Chase comes from mos7840
1270  *              2. A timeout of 10 seconds without activity has expired
1271  *                 (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1272  *
1273  ************************************************************************/
1274
1275 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1276                                         struct moschip_port *mos7840_port)
1277 {
1278         int timeout = 1 * HZ;
1279         int wait = 10;
1280         int count;
1281
1282         while (1) {
1283                 count = mos7840_chars_in_buffer(tty);
1284
1285                 /* Check for Buffer status */
1286                 if (count <= 0)
1287                         return;
1288
1289                 /* Block the thread for a while */
1290                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1291                                                timeout);
1292                 /* No activity.. count down section */
1293                 wait--;
1294                 if (wait == 0) {
1295                         dbg("%s - TIMEOUT", __func__);
1296                         return;
1297                 } else {
1298                         /* Reset timeout value back to seconds */
1299                         wait = 10;
1300                 }
1301         }
1302
1303 }
1304
1305 /*****************************************************************************
1306  * mos7840_break
1307  *      this function sends a break to the port
1308  *****************************************************************************/
1309 static void mos7840_break(struct tty_struct *tty, int break_state)
1310 {
1311         struct usb_serial_port *port = tty->driver_data;
1312         unsigned char data;
1313         struct usb_serial *serial;
1314         struct moschip_port *mos7840_port;
1315
1316         dbg("%s \n", "Entering ...........");
1317         dbg("mos7840_break: Start\n");
1318
1319         if (mos7840_port_paranoia_check(port, __func__)) {
1320                 dbg("%s", "Port Paranoia failed \n");
1321                 return;
1322         }
1323
1324         serial = mos7840_get_usb_serial(port, __func__);
1325         if (!serial) {
1326                 dbg("%s", "Serial Paranoia failed \n");
1327                 return;
1328         }
1329
1330         mos7840_port = mos7840_get_port_private(port);
1331
1332         if (mos7840_port == NULL)
1333                 return;
1334
1335         if (serial->dev)
1336                 /* flush and block until tx is empty */
1337                 mos7840_block_until_chase_response(tty, mos7840_port);
1338
1339         if (break_state == -1)
1340                 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1341         else
1342                 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1343
1344         mos7840_port->shadowLCR = data;
1345         dbg("mcs7840_break mos7840_port->shadowLCR is %x\n",
1346             mos7840_port->shadowLCR);
1347         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1348                              mos7840_port->shadowLCR);
1349
1350         return;
1351 }
1352
1353 /*****************************************************************************
1354  * mos7840_write_room
1355  *      this function is called by the tty driver when it wants to know how many
1356  *      bytes of data we can accept for a specific port.
1357  *      If successful, we return the amount of room that we have for this port
1358  *      Otherwise we return a negative error number.
1359  *****************************************************************************/
1360
1361 static int mos7840_write_room(struct tty_struct *tty)
1362 {
1363         struct usb_serial_port *port = tty->driver_data;
1364         int i;
1365         int room = 0;
1366         unsigned long flags;
1367         struct moschip_port *mos7840_port;
1368
1369         dbg("%s \n", " mos7840_write_room:entering ...........");
1370
1371         if (mos7840_port_paranoia_check(port, __func__)) {
1372                 dbg("%s", "Invalid port \n");
1373                 dbg("%s \n", " mos7840_write_room:leaving ...........");
1374                 return -1;
1375         }
1376
1377         mos7840_port = mos7840_get_port_private(port);
1378         if (mos7840_port == NULL) {
1379                 dbg("%s \n", "mos7840_break:leaving ...........");
1380                 return -1;
1381         }
1382
1383         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1384         for (i = 0; i < NUM_URBS; ++i) {
1385                 if (!mos7840_port->busy[i])
1386                         room += URB_TRANSFER_BUFFER_SIZE;
1387         }
1388         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1389
1390         room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1391         dbg("%s - returns %d", __func__, room);
1392         return room;
1393
1394 }
1395
1396 /*****************************************************************************
1397  * mos7840_write
1398  *      this function is called by the tty driver when data should be written to
1399  *      the port.
1400  *      If successful, we return the number of bytes written, otherwise we
1401  *      return a negative error number.
1402  *****************************************************************************/
1403
1404 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1405                          const unsigned char *data, int count)
1406 {
1407         int status;
1408         int i;
1409         int bytes_sent = 0;
1410         int transfer_size;
1411         unsigned long flags;
1412
1413         struct moschip_port *mos7840_port;
1414         struct usb_serial *serial;
1415         struct urb *urb;
1416         /* __u16 Data; */
1417         const unsigned char *current_position = data;
1418         unsigned char *data1;
1419         dbg("%s \n", "entering ...........");
1420         /* dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",
1421                                         mos7840_port->shadowLCR); */
1422
1423 #ifdef NOTMOS7840
1424         Data = 0x00;
1425         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1426         mos7840_port->shadowLCR = Data;
1427         dbg("mos7840_write: LINE_CONTROL_REGISTER is %x\n", Data);
1428         dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",
1429             mos7840_port->shadowLCR);
1430
1431         /* Data = 0x03; */
1432         /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1433         /* mos7840_port->shadowLCR=Data;//Need to add later */
1434
1435         Data |= SERIAL_LCR_DLAB;        /* data latch enable in LCR 0x80 */
1436         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1437
1438         /* Data = 0x0c; */
1439         /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1440         Data = 0x00;
1441         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1442         dbg("mos7840_write:DLL value is %x\n", Data);
1443
1444         Data = 0x0;
1445         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1446         dbg("mos7840_write:DLM value is %x\n", Data);
1447
1448         Data = Data & ~SERIAL_LCR_DLAB;
1449         dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",
1450             mos7840_port->shadowLCR);
1451         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1452 #endif
1453
1454         if (mos7840_port_paranoia_check(port, __func__)) {
1455                 dbg("%s", "Port Paranoia failed \n");
1456                 return -1;
1457         }
1458
1459         serial = port->serial;
1460         if (mos7840_serial_paranoia_check(serial, __func__)) {
1461                 dbg("%s", "Serial Paranoia failed \n");
1462                 return -1;
1463         }
1464
1465         mos7840_port = mos7840_get_port_private(port);
1466         if (mos7840_port == NULL) {
1467                 dbg("%s", "mos7840_port is NULL\n");
1468                 return -1;
1469         }
1470
1471         /* try to find a free urb in the list */
1472         urb = NULL;
1473
1474         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1475         for (i = 0; i < NUM_URBS; ++i) {
1476                 if (!mos7840_port->busy[i]) {
1477                         mos7840_port->busy[i] = 1;
1478                         urb = mos7840_port->write_urb_pool[i];
1479                         dbg("\nURB:%d", i);
1480                         break;
1481                 }
1482         }
1483         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1484
1485         if (urb == NULL) {
1486                 dbg("%s - no more free urbs", __func__);
1487                 goto exit;
1488         }
1489
1490         if (urb->transfer_buffer == NULL) {
1491                 urb->transfer_buffer =
1492                     kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1493
1494                 if (urb->transfer_buffer == NULL) {
1495                         err("%s no more kernel memory...", __func__);
1496                         goto exit;
1497                 }
1498         }
1499         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1500
1501         memcpy(urb->transfer_buffer, current_position, transfer_size);
1502
1503         /* fill urb with data and submit  */
1504         usb_fill_bulk_urb(urb,
1505                           serial->dev,
1506                           usb_sndbulkpipe(serial->dev,
1507                                           port->bulk_out_endpointAddress),
1508                           urb->transfer_buffer,
1509                           transfer_size,
1510                           mos7840_bulk_out_data_callback, mos7840_port);
1511
1512         data1 = urb->transfer_buffer;
1513         dbg("\nbulkout endpoint is %d", port->bulk_out_endpointAddress);
1514
1515         /* send it down the pipe */
1516         status = usb_submit_urb(urb, GFP_ATOMIC);
1517
1518         if (status) {
1519                 mos7840_port->busy[i] = 0;
1520                 err("%s - usb_submit_urb(write bulk) failed with status = %d",
1521                     __func__, status);
1522                 bytes_sent = status;
1523                 goto exit;
1524         }
1525         bytes_sent = transfer_size;
1526         mos7840_port->icount.tx += transfer_size;
1527         smp_wmb();
1528         dbg("mos7840_port->icount.tx is %d:\n", mos7840_port->icount.tx);
1529 exit:
1530         return bytes_sent;
1531
1532 }
1533
1534 /*****************************************************************************
1535  * mos7840_throttle
1536  *      this function is called by the tty driver when it wants to stop the data
1537  *      being read from the port.
1538  *****************************************************************************/
1539
1540 static void mos7840_throttle(struct tty_struct *tty)
1541 {
1542         struct usb_serial_port *port = tty->driver_data;
1543         struct moschip_port *mos7840_port;
1544         int status;
1545
1546         if (mos7840_port_paranoia_check(port, __func__)) {
1547                 dbg("%s", "Invalid port \n");
1548                 return;
1549         }
1550
1551         dbg("- port %d\n", port->number);
1552
1553         mos7840_port = mos7840_get_port_private(port);
1554
1555         if (mos7840_port == NULL)
1556                 return;
1557
1558         if (!mos7840_port->open) {
1559                 dbg("%s\n", "port not opened");
1560                 return;
1561         }
1562
1563         dbg("%s", "Entering .......... \n");
1564
1565         /* if we are implementing XON/XOFF, send the stop character */
1566         if (I_IXOFF(tty)) {
1567                 unsigned char stop_char = STOP_CHAR(tty);
1568                 status = mos7840_write(tty, port, &stop_char, 1);
1569                 if (status <= 0)
1570                         return;
1571         }
1572         /* if we are implementing RTS/CTS, toggle that line */
1573         if (tty->termios->c_cflag & CRTSCTS) {
1574                 mos7840_port->shadowMCR &= ~MCR_RTS;
1575                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1576                                          mos7840_port->shadowMCR);
1577                 if (status < 0)
1578                         return;
1579         }
1580
1581         return;
1582 }
1583
1584 /*****************************************************************************
1585  * mos7840_unthrottle
1586  *      this function is called by the tty driver when it wants to resume
1587  *      the data being read from the port (called after mos7840_throttle is
1588  *      called)
1589  *****************************************************************************/
1590 static void mos7840_unthrottle(struct tty_struct *tty)
1591 {
1592         struct usb_serial_port *port = tty->driver_data;
1593         int status;
1594         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1595
1596         if (mos7840_port_paranoia_check(port, __func__)) {
1597                 dbg("%s", "Invalid port \n");
1598                 return;
1599         }
1600
1601         if (mos7840_port == NULL)
1602                 return;
1603
1604         if (!mos7840_port->open) {
1605                 dbg("%s - port not opened", __func__);
1606                 return;
1607         }
1608
1609         dbg("%s", "Entering .......... \n");
1610
1611         /* if we are implementing XON/XOFF, send the start character */
1612         if (I_IXOFF(tty)) {
1613                 unsigned char start_char = START_CHAR(tty);
1614                 status = mos7840_write(tty, port, &start_char, 1);
1615                 if (status <= 0)
1616                         return;
1617         }
1618
1619         /* if we are implementing RTS/CTS, toggle that line */
1620         if (tty->termios->c_cflag & CRTSCTS) {
1621                 mos7840_port->shadowMCR |= MCR_RTS;
1622                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1623                                          mos7840_port->shadowMCR);
1624                 if (status < 0)
1625                         return;
1626         }
1627 }
1628
1629 static int mos7840_tiocmget(struct tty_struct *tty, struct file *file)
1630 {
1631         struct usb_serial_port *port = tty->driver_data;
1632         struct moschip_port *mos7840_port;
1633         unsigned int result;
1634         __u16 msr;
1635         __u16 mcr;
1636         int status;
1637         mos7840_port = mos7840_get_port_private(port);
1638
1639         dbg("%s - port %d", __func__, port->number);
1640
1641         if (mos7840_port == NULL)
1642                 return -ENODEV;
1643
1644         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1645         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1646         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1647             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1648             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1649             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1650             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1651             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1652             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1653
1654         dbg("%s - 0x%04X", __func__, result);
1655
1656         return result;
1657 }
1658
1659 static int mos7840_tiocmset(struct tty_struct *tty, struct file *file,
1660                             unsigned int set, unsigned int clear)
1661 {
1662         struct usb_serial_port *port = tty->driver_data;
1663         struct moschip_port *mos7840_port;
1664         unsigned int mcr;
1665         int status;
1666
1667         dbg("%s - port %d", __func__, port->number);
1668
1669         mos7840_port = mos7840_get_port_private(port);
1670
1671         if (mos7840_port == NULL)
1672                 return -ENODEV;
1673
1674         /* FIXME: What locks the port registers ? */
1675         mcr = mos7840_port->shadowMCR;
1676         if (clear & TIOCM_RTS)
1677                 mcr &= ~MCR_RTS;
1678         if (clear & TIOCM_DTR)
1679                 mcr &= ~MCR_DTR;
1680         if (clear & TIOCM_LOOP)
1681                 mcr &= ~MCR_LOOPBACK;
1682
1683         if (set & TIOCM_RTS)
1684                 mcr |= MCR_RTS;
1685         if (set & TIOCM_DTR)
1686                 mcr |= MCR_DTR;
1687         if (set & TIOCM_LOOP)
1688                 mcr |= MCR_LOOPBACK;
1689
1690         mos7840_port->shadowMCR = mcr;
1691
1692         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1693         if (status < 0) {
1694                 dbg("setting MODEM_CONTROL_REGISTER Failed\n");
1695                 return status;
1696         }
1697
1698         return 0;
1699 }
1700
1701 /*****************************************************************************
1702  * mos7840_calc_baud_rate_divisor
1703  *      this function calculates the proper baud rate divisor for the specified
1704  *      baud rate.
1705  *****************************************************************************/
1706 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1707                                           __u16 *clk_sel_val)
1708 {
1709
1710         dbg("%s - %d", __func__, baudRate);
1711
1712         if (baudRate <= 115200) {
1713                 *divisor = 115200 / baudRate;
1714                 *clk_sel_val = 0x0;
1715         }
1716         if ((baudRate > 115200) && (baudRate <= 230400)) {
1717                 *divisor = 230400 / baudRate;
1718                 *clk_sel_val = 0x10;
1719         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1720                 *divisor = 403200 / baudRate;
1721                 *clk_sel_val = 0x20;
1722         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1723                 *divisor = 460800 / baudRate;
1724                 *clk_sel_val = 0x30;
1725         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1726                 *divisor = 806400 / baudRate;
1727                 *clk_sel_val = 0x40;
1728         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1729                 *divisor = 921600 / baudRate;
1730                 *clk_sel_val = 0x50;
1731         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1732                 *divisor = 1572864 / baudRate;
1733                 *clk_sel_val = 0x60;
1734         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1735                 *divisor = 3145728 / baudRate;
1736                 *clk_sel_val = 0x70;
1737         }
1738         return 0;
1739
1740 #ifdef NOTMCS7840
1741
1742         for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1743                 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1744                         *divisor = mos7840_divisor_table[i].Divisor;
1745                         return 0;
1746                 }
1747         }
1748
1749         /* After trying for all the standard baud rates    *
1750          * Try calculating the divisor for this baud rate  */
1751
1752         if (baudrate > 75 && baudrate < 230400) {
1753                 /* get the divisor */
1754                 custom = (__u16) (230400L / baudrate);
1755
1756                 /* Check for round off */
1757                 round1 = (__u16) (2304000L / baudrate);
1758                 round = (__u16) (round1 - (custom * 10));
1759                 if (round > 4)
1760                         custom++;
1761                 *divisor = custom;
1762
1763                 dbg(" Baud %d = %d\n", baudrate, custom);
1764                 return 0;
1765         }
1766
1767         dbg("%s\n", " Baud calculation Failed...");
1768         return -1;
1769 #endif
1770 }
1771
1772 /*****************************************************************************
1773  * mos7840_send_cmd_write_baud_rate
1774  *      this function sends the proper command to change the baud rate of the
1775  *      specified port.
1776  *****************************************************************************/
1777
1778 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1779                                             int baudRate)
1780 {
1781         int divisor = 0;
1782         int status;
1783         __u16 Data;
1784         unsigned char number;
1785         __u16 clk_sel_val;
1786         struct usb_serial_port *port;
1787
1788         if (mos7840_port == NULL)
1789                 return -1;
1790
1791         port = (struct usb_serial_port *)mos7840_port->port;
1792         if (mos7840_port_paranoia_check(port, __func__)) {
1793                 dbg("%s", "Invalid port \n");
1794                 return -1;
1795         }
1796
1797         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1798                 dbg("%s", "Invalid Serial \n");
1799                 return -1;
1800         }
1801
1802         dbg("%s", "Entering .......... \n");
1803
1804         number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1805
1806         dbg("%s - port = %d, baud = %d", __func__,
1807             mos7840_port->port->number, baudRate);
1808         /* reset clk_uart_sel in spregOffset */
1809         if (baudRate > 115200) {
1810 #ifdef HW_flow_control
1811                 /* NOTE: need to see the pther register to modify */
1812                 /* setting h/w flow control bit to 1 */
1813                 Data = 0x2b;
1814                 mos7840_port->shadowMCR = Data;
1815                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1816                                                                         Data);
1817                 if (status < 0) {
1818                         dbg("Writing spreg failed in set_serial_baud\n");
1819                         return -1;
1820                 }
1821 #endif
1822
1823         } else {
1824 #ifdef HW_flow_control
1825                 / *setting h/w flow control bit to 0 */
1826                 Data = 0xb;
1827                 mos7840_port->shadowMCR = Data;
1828                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1829                                                                         Data);
1830                 if (status < 0) {
1831                         dbg("Writing spreg failed in set_serial_baud\n");
1832                         return -1;
1833                 }
1834 #endif
1835
1836         }
1837
1838         if (1) {                /* baudRate <= 115200) */
1839                 clk_sel_val = 0x0;
1840                 Data = 0x0;
1841                 status = mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1842                                                    &clk_sel_val);
1843                 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1844                                                                  &Data);
1845                 if (status < 0) {
1846                         dbg("reading spreg failed in set_serial_baud\n");
1847                         return -1;
1848                 }
1849                 Data = (Data & 0x8f) | clk_sel_val;
1850                 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1851                                                                 Data);
1852                 if (status < 0) {
1853                         dbg("Writing spreg failed in set_serial_baud\n");
1854                         return -1;
1855                 }
1856                 /* Calculate the Divisor */
1857
1858                 if (status) {
1859                         err("%s - bad baud rate", __func__);
1860                         dbg("%s\n", "bad baud rate");
1861                         return status;
1862                 }
1863                 /* Enable access to divisor latch */
1864                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1865                 mos7840_port->shadowLCR = Data;
1866                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1867
1868                 /* Write the divisor */
1869                 Data = (unsigned char)(divisor & 0xff);
1870                 dbg("set_serial_baud Value to write DLL is %x\n", Data);
1871                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1872
1873                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1874                 dbg("set_serial_baud Value to write DLM is %x\n", Data);
1875                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1876
1877                 /* Disable access to divisor latch */
1878                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1879                 mos7840_port->shadowLCR = Data;
1880                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1881
1882         }
1883         return status;
1884 }
1885
1886 /*****************************************************************************
1887  * mos7840_change_port_settings
1888  *      This routine is called to set the UART on the device to match
1889  *      the specified new settings.
1890  *****************************************************************************/
1891
1892 static void mos7840_change_port_settings(struct tty_struct *tty,
1893         struct moschip_port *mos7840_port, struct ktermios *old_termios)
1894 {
1895         int baud;
1896         unsigned cflag;
1897         unsigned iflag;
1898         __u8 lData;
1899         __u8 lParity;
1900         __u8 lStop;
1901         int status;
1902         __u16 Data;
1903         struct usb_serial_port *port;
1904         struct usb_serial *serial;
1905
1906         if (mos7840_port == NULL)
1907                 return;
1908
1909         port = (struct usb_serial_port *)mos7840_port->port;
1910
1911         if (mos7840_port_paranoia_check(port, __func__)) {
1912                 dbg("%s", "Invalid port \n");
1913                 return;
1914         }
1915
1916         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1917                 dbg("%s", "Invalid Serial \n");
1918                 return;
1919         }
1920
1921         serial = port->serial;
1922
1923         dbg("%s - port %d", __func__, mos7840_port->port->number);
1924
1925         if (!mos7840_port->open) {
1926                 dbg("%s - port not opened", __func__);
1927                 return;
1928         }
1929
1930         dbg("%s", "Entering .......... \n");
1931
1932         lData = LCR_BITS_8;
1933         lStop = LCR_STOP_1;
1934         lParity = LCR_PAR_NONE;
1935
1936         cflag = tty->termios->c_cflag;
1937         iflag = tty->termios->c_iflag;
1938
1939         /* Change the number of bits */
1940         if (cflag & CSIZE) {
1941                 switch (cflag & CSIZE) {
1942                 case CS5:
1943                         lData = LCR_BITS_5;
1944                         break;
1945
1946                 case CS6:
1947                         lData = LCR_BITS_6;
1948                         break;
1949
1950                 case CS7:
1951                         lData = LCR_BITS_7;
1952                         break;
1953                 default:
1954                 case CS8:
1955                         lData = LCR_BITS_8;
1956                         break;
1957                 }
1958         }
1959         /* Change the Parity bit */
1960         if (cflag & PARENB) {
1961                 if (cflag & PARODD) {
1962                         lParity = LCR_PAR_ODD;
1963                         dbg("%s - parity = odd", __func__);
1964                 } else {
1965                         lParity = LCR_PAR_EVEN;
1966                         dbg("%s - parity = even", __func__);
1967                 }
1968
1969         } else {
1970                 dbg("%s - parity = none", __func__);
1971         }
1972
1973         if (cflag & CMSPAR)
1974                 lParity = lParity | 0x20;
1975
1976         /* Change the Stop bit */
1977         if (cflag & CSTOPB) {
1978                 lStop = LCR_STOP_2;
1979                 dbg("%s - stop bits = 2", __func__);
1980         } else {
1981                 lStop = LCR_STOP_1;
1982                 dbg("%s - stop bits = 1", __func__);
1983         }
1984
1985         /* Update the LCR with the correct value */
1986         mos7840_port->shadowLCR &=
1987             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1988         mos7840_port->shadowLCR |= (lData | lParity | lStop);
1989
1990         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x\n",
1991             mos7840_port->shadowLCR);
1992         /* Disable Interrupts */
1993         Data = 0x00;
1994         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1995
1996         Data = 0x00;
1997         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1998
1999         Data = 0xcf;
2000         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2001
2002         /* Send the updated LCR value to the mos7840 */
2003         Data = mos7840_port->shadowLCR;
2004
2005         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
2006
2007         Data = 0x00b;
2008         mos7840_port->shadowMCR = Data;
2009         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2010         Data = 0x00b;
2011         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2012
2013         /* set up the MCR register and send it to the mos7840 */
2014
2015         mos7840_port->shadowMCR = MCR_MASTER_IE;
2016         if (cflag & CBAUD)
2017                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
2018
2019         if (cflag & CRTSCTS)
2020                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
2021         else
2022                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
2023
2024         Data = mos7840_port->shadowMCR;
2025         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2026
2027         /* Determine divisor based on baud rate */
2028         baud = tty_get_baud_rate(tty);
2029
2030         if (!baud) {
2031                 /* pick a default, any default... */
2032                 dbg("%s\n", "Picked default baud...");
2033                 baud = 9600;
2034         }
2035
2036         dbg("%s - baud rate = %d", __func__, baud);
2037         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2038
2039         /* Enable Interrupts */
2040         Data = 0x0c;
2041         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2042
2043         if (mos7840_port->read_urb->status != -EINPROGRESS) {
2044                 mos7840_port->read_urb->dev = serial->dev;
2045
2046                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2047
2048                 if (status) {
2049                         dbg(" usb_submit_urb(read bulk) failed, status = %d",
2050                             status);
2051                 }
2052         }
2053         wake_up(&mos7840_port->delta_msr_wait);
2054         mos7840_port->delta_msr_cond = 1;
2055         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x\n",
2056             mos7840_port->shadowLCR);
2057
2058         return;
2059 }
2060
2061 /*****************************************************************************
2062  * mos7840_set_termios
2063  *      this function is called by the tty driver when it wants to change
2064  *      the termios structure
2065  *****************************************************************************/
2066
2067 static void mos7840_set_termios(struct tty_struct *tty,
2068                                 struct usb_serial_port *port,
2069                                 struct ktermios *old_termios)
2070 {
2071         int status;
2072         unsigned int cflag;
2073         struct usb_serial *serial;
2074         struct moschip_port *mos7840_port;
2075         dbg("mos7840_set_termios: START\n");
2076         if (mos7840_port_paranoia_check(port, __func__)) {
2077                 dbg("%s", "Invalid port \n");
2078                 return;
2079         }
2080
2081         serial = port->serial;
2082
2083         if (mos7840_serial_paranoia_check(serial, __func__)) {
2084                 dbg("%s", "Invalid Serial \n");
2085                 return;
2086         }
2087
2088         mos7840_port = mos7840_get_port_private(port);
2089
2090         if (mos7840_port == NULL)
2091                 return;
2092
2093         if (!mos7840_port->open) {
2094                 dbg("%s - port not opened", __func__);
2095                 return;
2096         }
2097
2098         dbg("%s\n", "setting termios - ");
2099
2100         cflag = tty->termios->c_cflag;
2101
2102         dbg("%s - clfag %08x iflag %08x", __func__,
2103             tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2104         dbg("%s - old clfag %08x old iflag %08x", __func__,
2105             old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2106         dbg("%s - port %d", __func__, port->number);
2107
2108         /* change the port settings to the new ones specified */
2109
2110         mos7840_change_port_settings(tty, mos7840_port, old_termios);
2111
2112         if (!mos7840_port->read_urb) {
2113                 dbg("%s", "URB KILLED !!!!!\n");
2114                 return;
2115         }
2116
2117         if (mos7840_port->read_urb->status != -EINPROGRESS) {
2118                 mos7840_port->read_urb->dev = serial->dev;
2119                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2120                 if (status) {
2121                         dbg(" usb_submit_urb(read bulk) failed, status = %d",
2122                             status);
2123                 }
2124         }
2125         return;
2126 }
2127
2128 /*****************************************************************************
2129  * mos7840_get_lsr_info - get line status register info
2130  *
2131  * Purpose: Let user call ioctl() to get info when the UART physically
2132  *          is emptied.  On bus types like RS485, the transmitter must
2133  *          release the bus after transmitting. This must be done when
2134  *          the transmit shift register is empty, not be done when the
2135  *          transmit holding register is empty.  This functionality
2136  *          allows an RS485 driver to be written in user space.
2137  *****************************************************************************/
2138
2139 static int mos7840_get_lsr_info(struct tty_struct *tty,
2140                                 unsigned int __user *value)
2141 {
2142         int count;
2143         unsigned int result = 0;
2144
2145         count = mos7840_chars_in_buffer(tty);
2146         if (count == 0) {
2147                 dbg("%s -- Empty", __func__);
2148                 result = TIOCSER_TEMT;
2149         }
2150
2151         if (copy_to_user(value, &result, sizeof(int)))
2152                 return -EFAULT;
2153         return 0;
2154 }
2155
2156 /*****************************************************************************
2157  * mos7840_set_modem_info
2158  *      function to set modem info
2159  *****************************************************************************/
2160
2161 /* FIXME: Should be using the model control hooks */
2162
2163 static int mos7840_set_modem_info(struct moschip_port *mos7840_port,
2164                                   unsigned int cmd, unsigned int __user *value)
2165 {
2166         unsigned int mcr;
2167         unsigned int arg;
2168         __u16 Data;
2169         int status;
2170         struct usb_serial_port *port;
2171
2172         if (mos7840_port == NULL)
2173                 return -1;
2174
2175         port = (struct usb_serial_port *)mos7840_port->port;
2176         if (mos7840_port_paranoia_check(port, __func__)) {
2177                 dbg("%s", "Invalid port \n");
2178                 return -1;
2179         }
2180
2181         mcr = mos7840_port->shadowMCR;
2182
2183         if (copy_from_user(&arg, value, sizeof(int)))
2184                 return -EFAULT;
2185
2186         switch (cmd) {
2187         case TIOCMBIS:
2188                 if (arg & TIOCM_RTS)
2189                         mcr |= MCR_RTS;
2190                 if (arg & TIOCM_DTR)
2191                         mcr |= MCR_RTS;
2192                 if (arg & TIOCM_LOOP)
2193                         mcr |= MCR_LOOPBACK;
2194                 break;
2195
2196         case TIOCMBIC:
2197                 if (arg & TIOCM_RTS)
2198                         mcr &= ~MCR_RTS;
2199                 if (arg & TIOCM_DTR)
2200                         mcr &= ~MCR_RTS;
2201                 if (arg & TIOCM_LOOP)
2202                         mcr &= ~MCR_LOOPBACK;
2203                 break;
2204
2205         case TIOCMSET:
2206                 /* turn off the RTS and DTR and LOOPBACK
2207                  * and then only turn on what was asked to */
2208                 mcr &= ~(MCR_RTS | MCR_DTR | MCR_LOOPBACK);
2209                 mcr |= ((arg & TIOCM_RTS) ? MCR_RTS : 0);
2210                 mcr |= ((arg & TIOCM_DTR) ? MCR_DTR : 0);
2211                 mcr |= ((arg & TIOCM_LOOP) ? MCR_LOOPBACK : 0);
2212                 break;
2213         }
2214
2215         mos7840_port->shadowMCR = mcr;
2216
2217         Data = mos7840_port->shadowMCR;
2218         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2219         if (status < 0) {
2220                 dbg("setting MODEM_CONTROL_REGISTER Failed\n");
2221                 return -1;
2222         }
2223
2224         return 0;
2225 }
2226
2227 /*****************************************************************************
2228  * mos7840_get_modem_info
2229  *      function to get modem info
2230  *****************************************************************************/
2231
2232 static int mos7840_get_modem_info(struct moschip_port *mos7840_port,
2233                                   unsigned int __user *value)
2234 {
2235         unsigned int result = 0;
2236         __u16 msr;
2237         unsigned int mcr = mos7840_port->shadowMCR;
2238         mos7840_get_uart_reg(mos7840_port->port,
2239                                                 MODEM_STATUS_REGISTER, &msr);
2240         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)      /* 0x002 */
2241             |((mcr & MCR_RTS) ? TIOCM_RTS : 0)  /* 0x004 */
2242             |((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)  /* 0x020 */
2243             |((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)   /* 0x040 */
2244             |((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)    /* 0x080 */
2245             |((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */
2246
2247         dbg("%s -- %x", __func__, result);
2248
2249         if (copy_to_user(value, &result, sizeof(int)))
2250                 return -EFAULT;
2251         return 0;
2252 }
2253
2254 /*****************************************************************************
2255  * mos7840_get_serial_info
2256  *      function to get information about serial port
2257  *****************************************************************************/
2258
2259 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2260                                    struct serial_struct __user *retinfo)
2261 {
2262         struct serial_struct tmp;
2263
2264         if (mos7840_port == NULL)
2265                 return -1;
2266
2267         if (!retinfo)
2268                 return -EFAULT;
2269
2270         memset(&tmp, 0, sizeof(tmp));
2271
2272         tmp.type = PORT_16550A;
2273         tmp.line = mos7840_port->port->serial->minor;
2274         tmp.port = mos7840_port->port->number;
2275         tmp.irq = 0;
2276         tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2277         tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2278         tmp.baud_base = 9600;
2279         tmp.close_delay = 5 * HZ;
2280         tmp.closing_wait = 30 * HZ;
2281
2282         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2283                 return -EFAULT;
2284         return 0;
2285 }
2286
2287 /*****************************************************************************
2288  * SerialIoctl
2289  *      this function handles any ioctl calls to the driver
2290  *****************************************************************************/
2291
2292 static int mos7840_ioctl(struct tty_struct *tty, struct file *file,
2293                          unsigned int cmd, unsigned long arg)
2294 {
2295         struct usb_serial_port *port = tty->driver_data;
2296         void __user *argp = (void __user *)arg;
2297         struct moschip_port *mos7840_port;
2298
2299         struct async_icount cnow;
2300         struct async_icount cprev;
2301         struct serial_icounter_struct icount;
2302         int mosret = 0;
2303
2304         if (mos7840_port_paranoia_check(port, __func__)) {
2305                 dbg("%s", "Invalid port \n");
2306                 return -1;
2307         }
2308
2309         mos7840_port = mos7840_get_port_private(port);
2310
2311         if (mos7840_port == NULL)
2312                 return -1;
2313
2314         dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
2315
2316         switch (cmd) {
2317                 /* return number of bytes available */
2318
2319         case TIOCSERGETLSR:
2320                 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
2321                 return mos7840_get_lsr_info(tty, argp);
2322                 return 0;
2323
2324         /* FIXME: use the modem hooks and remove this */
2325         case TIOCMBIS:
2326         case TIOCMBIC:
2327         case TIOCMSET:
2328                 dbg("%s (%d) TIOCMSET/TIOCMBIC/TIOCMSET", __func__,
2329                     port->number);
2330                 mosret =
2331                     mos7840_set_modem_info(mos7840_port, cmd, argp);
2332                 return mosret;
2333
2334         case TIOCMGET:
2335                 dbg("%s (%d) TIOCMGET", __func__, port->number);
2336                 return mos7840_get_modem_info(mos7840_port, argp);
2337
2338         case TIOCGSERIAL:
2339                 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
2340                 return mos7840_get_serial_info(mos7840_port, argp);
2341
2342         case TIOCSSERIAL:
2343                 dbg("%s (%d) TIOCSSERIAL", __func__, port->number);
2344                 break;
2345
2346         case TIOCMIWAIT:
2347                 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
2348                 cprev = mos7840_port->icount;
2349                 while (1) {
2350                         /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2351                         mos7840_port->delta_msr_cond = 0;
2352                         wait_event_interruptible(mos7840_port->delta_msr_wait,
2353                                                  (mos7840_port->
2354                                                   delta_msr_cond == 1));
2355
2356                         /* see if a signal did it */
2357                         if (signal_pending(current))
2358                                 return -ERESTARTSYS;
2359                         cnow = mos7840_port->icount;
2360                         smp_rmb();
2361                         if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2362                             cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2363                                 return -EIO;    /* no change => error */
2364                         if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2365                             ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2366                             ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2367                             ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2368                                 return 0;
2369                         }
2370                         cprev = cnow;
2371                 }
2372                 /* NOTREACHED */
2373                 break;
2374
2375         case TIOCGICOUNT:
2376                 cnow = mos7840_port->icount;
2377                 smp_rmb();
2378                 icount.cts = cnow.cts;
2379                 icount.dsr = cnow.dsr;
2380                 icount.rng = cnow.rng;
2381                 icount.dcd = cnow.dcd;
2382                 icount.rx = cnow.rx;
2383                 icount.tx = cnow.tx;
2384                 icount.frame = cnow.frame;
2385                 icount.overrun = cnow.overrun;
2386                 icount.parity = cnow.parity;
2387                 icount.brk = cnow.brk;
2388                 icount.buf_overrun = cnow.buf_overrun;
2389
2390                 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
2391                     port->number, icount.rx, icount.tx);
2392                 if (copy_to_user(argp, &icount, sizeof(icount)))
2393                         return -EFAULT;
2394                 return 0;
2395         default:
2396                 break;
2397         }
2398         return -ENOIOCTLCMD;
2399 }
2400
2401 static int mos7840_calc_num_ports(struct usb_serial *serial)
2402 {
2403         int mos7840_num_ports = 0;
2404
2405         dbg("numberofendpoints: %d \n",
2406             (int)serial->interface->cur_altsetting->desc.bNumEndpoints);
2407         dbg("numberofendpoints: %d \n",
2408             (int)serial->interface->altsetting->desc.bNumEndpoints);
2409         if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) {
2410                 mos7840_num_ports = serial->num_ports = 2;
2411         } else if (serial->interface->cur_altsetting->desc.bNumEndpoints == 9) {
2412                 serial->num_bulk_in = 4;
2413                 serial->num_bulk_out = 4;
2414                 mos7840_num_ports = serial->num_ports = 4;
2415         }
2416
2417         return mos7840_num_ports;
2418 }
2419
2420 /****************************************************************************
2421  * mos7840_startup
2422  ****************************************************************************/
2423
2424 static int mos7840_startup(struct usb_serial *serial)
2425 {
2426         struct moschip_port *mos7840_port;
2427         struct usb_device *dev;
2428         int i, status;
2429
2430         __u16 Data;
2431         dbg("%s \n", " mos7840_startup :entering..........");
2432
2433         if (!serial) {
2434                 dbg("%s\n", "Invalid Handler");
2435                 return -1;
2436         }
2437
2438         dev = serial->dev;
2439
2440         dbg("%s\n", "Entering...");
2441
2442         /* we set up the pointers to the endpoints in the mos7840_open *
2443          * function, as the structures aren't created yet.             */
2444
2445         /* set up port private structures */
2446         for (i = 0; i < serial->num_ports; ++i) {
2447                 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2448                 if (mos7840_port == NULL) {
2449                         err("%s - Out of memory", __func__);
2450                         status = -ENOMEM;
2451                         i--; /* don't follow NULL pointer cleaning up */
2452                         goto error;
2453                 }
2454
2455                 /* Initialize all port interrupt end point to port 0 int
2456                  * endpoint. Our device has only one interrupt end point
2457                  * common to all port */
2458
2459                 mos7840_port->port = serial->port[i];
2460                 mos7840_set_port_private(serial->port[i], mos7840_port);
2461                 spin_lock_init(&mos7840_port->pool_lock);
2462
2463                 mos7840_port->port_num = ((serial->port[i]->number -
2464                                            (serial->port[i]->serial->minor)) +
2465                                           1);
2466
2467                 if (mos7840_port->port_num == 1) {
2468                         mos7840_port->SpRegOffset = 0x0;
2469                         mos7840_port->ControlRegOffset = 0x1;
2470                         mos7840_port->DcrRegOffset = 0x4;
2471                 } else if ((mos7840_port->port_num == 2)
2472                            && (serial->num_ports == 4)) {
2473                         mos7840_port->SpRegOffset = 0x8;
2474                         mos7840_port->ControlRegOffset = 0x9;
2475                         mos7840_port->DcrRegOffset = 0x16;
2476                 } else if ((mos7840_port->port_num == 2)
2477                            && (serial->num_ports == 2)) {
2478                         mos7840_port->SpRegOffset = 0xa;
2479                         mos7840_port->ControlRegOffset = 0xb;
2480                         mos7840_port->DcrRegOffset = 0x19;
2481                 } else if ((mos7840_port->port_num == 3)
2482                            && (serial->num_ports == 4)) {
2483                         mos7840_port->SpRegOffset = 0xa;
2484                         mos7840_port->ControlRegOffset = 0xb;
2485                         mos7840_port->DcrRegOffset = 0x19;
2486                 } else if ((mos7840_port->port_num == 4)
2487                            && (serial->num_ports == 4)) {
2488                         mos7840_port->SpRegOffset = 0xc;
2489                         mos7840_port->ControlRegOffset = 0xd;
2490                         mos7840_port->DcrRegOffset = 0x1c;
2491                 }
2492                 mos7840_dump_serial_port(mos7840_port);
2493                 mos7840_set_port_private(serial->port[i], mos7840_port);
2494
2495                 /* enable rx_disable bit in control register */
2496                 status = mos7840_get_reg_sync(serial->port[i],
2497                                  mos7840_port->ControlRegOffset, &Data);
2498                 if (status < 0) {
2499                         dbg("Reading ControlReg failed status-0x%x\n", status);
2500                         break;
2501                 } else
2502                         dbg("ControlReg Reading success val is %x, status%d\n",
2503                             Data, status);
2504                 Data |= 0x08;   /* setting driver done bit */
2505                 Data |= 0x04;   /* sp1_bit to have cts change reflect in
2506                                    modem status reg */
2507
2508                 /* Data |= 0x20; //rx_disable bit */
2509                 status = mos7840_set_reg_sync(serial->port[i],
2510                                          mos7840_port->ControlRegOffset, Data);
2511                 if (status < 0) {
2512                         dbg("Writing ControlReg failed(rx_disable) status-0x%x\n", status);
2513                         break;
2514                 } else
2515                         dbg("ControlReg Writing success(rx_disable) status%d\n",
2516                             status);
2517
2518                 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2519                    and 0x24 in DCR3 */
2520                 Data = 0x01;
2521                 status = mos7840_set_reg_sync(serial->port[i],
2522                          (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2523                 if (status < 0) {
2524                         dbg("Writing DCR0 failed status-0x%x\n", status);
2525                         break;
2526                 } else
2527                         dbg("DCR0 Writing success status%d\n", status);
2528
2529                 Data = 0x05;
2530                 status = mos7840_set_reg_sync(serial->port[i],
2531                          (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2532                 if (status < 0) {
2533                         dbg("Writing DCR1 failed status-0x%x\n", status);
2534                         break;
2535                 } else
2536                         dbg("DCR1 Writing success status%d\n", status);
2537
2538                 Data = 0x24;
2539                 status = mos7840_set_reg_sync(serial->port[i],
2540                          (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2541                 if (status < 0) {
2542                         dbg("Writing DCR2 failed status-0x%x\n", status);
2543                         break;
2544                 } else
2545                         dbg("DCR2 Writing success status%d\n", status);
2546
2547                 /* write values in clkstart0x0 and clkmulti 0x20 */
2548                 Data = 0x0;
2549                 status = mos7840_set_reg_sync(serial->port[i],
2550                                          CLK_START_VALUE_REGISTER, Data);
2551                 if (status < 0) {
2552                         dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
2553                         break;
2554                 } else
2555                         dbg("CLK_START_VALUE_REGISTER Writing success status%d\n", status);
2556
2557                 Data = 0x20;
2558                 status = mos7840_set_reg_sync(serial->port[i],
2559                                         CLK_MULTI_REGISTER, Data);
2560                 if (status < 0) {
2561                         dbg("Writing CLK_MULTI_REGISTER failed status-0x%x\n",
2562                             status);
2563                         goto error;
2564                 } else
2565                         dbg("CLK_MULTI_REGISTER Writing success status%d\n",
2566                             status);
2567
2568                 /* write value 0x0 to scratchpad register */
2569                 Data = 0x00;
2570                 status = mos7840_set_uart_reg(serial->port[i],
2571                                                 SCRATCH_PAD_REGISTER, Data);
2572                 if (status < 0) {
2573                         dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x\n",
2574                             status);
2575                         break;
2576                 } else
2577                         dbg("SCRATCH_PAD_REGISTER Writing success status%d\n",
2578                             status);
2579
2580                 /* Zero Length flag register */
2581                 if ((mos7840_port->port_num != 1)
2582                     && (serial->num_ports == 2)) {
2583
2584                         Data = 0xff;
2585                         status = mos7840_set_reg_sync(serial->port[i],
2586                                       (__u16) (ZLP_REG1 +
2587                                       ((__u16)mos7840_port->port_num)), Data);
2588                         dbg("ZLIP offset%x\n",
2589                             (__u16) (ZLP_REG1 +
2590                                         ((__u16) mos7840_port->port_num)));
2591                         if (status < 0) {
2592                                 dbg("Writing ZLP_REG%d failed status-0x%x\n",
2593                                     i + 2, status);
2594                                 break;
2595                         } else
2596                                 dbg("ZLP_REG%d Writing success status%d\n",
2597                                     i + 2, status);
2598                 } else {
2599                         Data = 0xff;
2600                         status = mos7840_set_reg_sync(serial->port[i],
2601                               (__u16) (ZLP_REG1 +
2602                               ((__u16)mos7840_port->port_num) - 0x1), Data);
2603                         dbg("ZLIP offset%x\n",
2604                             (__u16) (ZLP_REG1 +
2605                                      ((__u16) mos7840_port->port_num) - 0x1));
2606                         if (status < 0) {
2607                                 dbg("Writing ZLP_REG%d failed status-0x%x\n",
2608                                     i + 1, status);
2609                                 break;
2610                         } else
2611                                 dbg("ZLP_REG%d Writing success status%d\n",
2612                                     i + 1, status);
2613
2614                 }
2615                 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2616                 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2617                 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2618                                                                 GFP_KERNEL);
2619                 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2620                                                         !mos7840_port->dr) {
2621                         status = -ENOMEM;
2622                         goto error;
2623                 }
2624         }
2625
2626         /* Zero Length flag enable */
2627         Data = 0x0f;
2628         status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2629         if (status < 0) {
2630                 dbg("Writing ZLP_REG5 failed status-0x%x\n", status);
2631                 goto error;
2632         } else
2633                 dbg("ZLP_REG5 Writing success status%d\n", status);
2634
2635         /* setting configuration feature to one */
2636         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2637                         (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
2638         return 0;
2639 error:
2640         for (/* nothing */; i >= 0; i--) {
2641                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2642
2643                 kfree(mos7840_port->dr);
2644                 kfree(mos7840_port->ctrl_buf);
2645                 usb_free_urb(mos7840_port->control_urb);
2646                 kfree(mos7840_port);
2647                 serial->port[i] = NULL;
2648         }
2649         return status;
2650 }
2651
2652 /****************************************************************************
2653  * mos7840_shutdown
2654  *      This function is called whenever the device is removed from the usb bus.
2655  ****************************************************************************/
2656
2657 static void mos7840_shutdown(struct usb_serial *serial)
2658 {
2659         int i;
2660         unsigned long flags;
2661         struct moschip_port *mos7840_port;
2662         dbg("%s \n", " shutdown :entering..........");
2663
2664         if (!serial) {
2665                 dbg("%s", "Invalid Handler \n");
2666                 return;
2667         }
2668
2669         /* check for the ports to be closed,close the ports and disconnect */
2670
2671         /* free private structure allocated for serial port  *
2672          * stop reads and writes on all ports                */
2673
2674         for (i = 0; i < serial->num_ports; ++i) {
2675                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2676                 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
2677                 mos7840_port->zombie = 1;
2678                 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
2679                 usb_kill_urb(mos7840_port->control_urb);
2680                 kfree(mos7840_port->ctrl_buf);
2681                 kfree(mos7840_port->dr);
2682                 kfree(mos7840_port);
2683                 mos7840_set_port_private(serial->port[i], NULL);
2684         }
2685
2686         dbg("%s\n", "Thank u :: ");
2687
2688 }
2689
2690 static struct usb_driver io_driver = {
2691         .name = "mos7840",
2692         .probe = usb_serial_probe,
2693         .disconnect = usb_serial_disconnect,
2694         .id_table = moschip_id_table_combined,
2695         .no_dynamic_id = 1,
2696 };
2697
2698 static struct usb_serial_driver moschip7840_4port_device = {
2699         .driver = {
2700                    .owner = THIS_MODULE,
2701                    .name = "mos7840",
2702                    },
2703         .description = DRIVER_DESC,
2704         .usb_driver = &io_driver,
2705         .id_table = moschip_port_id_table,
2706         .num_ports = 4,
2707         .open = mos7840_open,
2708         .close = mos7840_close,
2709         .write = mos7840_write,
2710         .write_room = mos7840_write_room,
2711         .chars_in_buffer = mos7840_chars_in_buffer,
2712         .throttle = mos7840_throttle,
2713         .unthrottle = mos7840_unthrottle,
2714         .calc_num_ports = mos7840_calc_num_ports,
2715 #ifdef MCSSerialProbe
2716         .probe = mos7840_serial_probe,
2717 #endif
2718         .ioctl = mos7840_ioctl,
2719         .set_termios = mos7840_set_termios,
2720         .break_ctl = mos7840_break,
2721         .tiocmget = mos7840_tiocmget,
2722         .tiocmset = mos7840_tiocmset,
2723         .attach = mos7840_startup,
2724         .shutdown = mos7840_shutdown,
2725         .read_bulk_callback = mos7840_bulk_in_callback,
2726         .read_int_callback = mos7840_interrupt_callback,
2727 };
2728
2729 /****************************************************************************
2730  * moschip7840_init
2731  *      This is called by the module subsystem, or on startup to initialize us
2732  ****************************************************************************/
2733 static int __init moschip7840_init(void)
2734 {
2735         int retval;
2736
2737         dbg("%s \n", " mos7840_init :entering..........");
2738
2739         /* Register with the usb serial */
2740         retval = usb_serial_register(&moschip7840_4port_device);
2741
2742         if (retval)
2743                 goto failed_port_device_register;
2744
2745         dbg("%s\n", "Entring...");
2746         info(DRIVER_DESC " " DRIVER_VERSION);
2747
2748         /* Register with the usb */
2749         retval = usb_register(&io_driver);
2750         if (retval == 0) {
2751                 dbg("%s\n", "Leaving...");
2752                 return 0;
2753         }
2754         usb_serial_deregister(&moschip7840_4port_device);
2755 failed_port_device_register:
2756         return retval;
2757 }
2758
2759 /****************************************************************************
2760  * moschip7840_exit
2761  *      Called when the driver is about to be unloaded.
2762  ****************************************************************************/
2763 static void __exit moschip7840_exit(void)
2764 {
2765
2766         dbg("%s \n", " mos7840_exit :entering..........");
2767
2768         usb_deregister(&io_driver);
2769
2770         usb_serial_deregister(&moschip7840_4port_device);
2771
2772         dbg("%s\n", "Entring...");
2773 }
2774
2775 module_init(moschip7840_init);
2776 module_exit(moschip7840_exit);
2777
2778 /* Module information */
2779 MODULE_DESCRIPTION(DRIVER_DESC);
2780 MODULE_LICENSE("GPL");
2781
2782 module_param(debug, bool, S_IRUGO | S_IWUSR);
2783 MODULE_PARM_DESC(debug, "Debug enabled or not");