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 <asm/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 to be Or'ed
 273         if (port->serial->num_ports == 4) {
 274                 val |=
 275                     (((__u16) port->number - (__u16) (port->serial->minor)) +
 276                      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 |=
 281                             (((__u16) port->number -
 282                               (__u16) (port->serial->minor)) + 1) << 8;
 283                         dbg("mos7840_set_uart_reg application number is %x\n",
 284                             val);
 285                 } else {
 286                         val |=
 287                             (((__u16) port->number -
 288                               (__u16) (port->serial->minor)) + 2) << 8;
 289                         dbg("mos7840_set_uart_reg application number is %x\n",
 290                             val);
 291                 }
 292         }
 293         return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
 294                                MCS_WR_RTYPE, val, reg, NULL, 0,
 295                                MOS_WDR_TIMEOUT);
 296
 297 }
 298
 299 /*
 300  * mos7840_get_uart_reg
 301  *      To set the Control register by calling usb_fill_control_urb function
 302  *      by passing usb_rcvctrlpipe function as parameter.
 303  */
 304 static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
 305                                 __u16 * val)
 306 {
 307         struct usb_device *dev = port->serial->dev;
 308         int ret = 0;
 309         __u16 Wval;
 310
 311         //dbg("application number is %4x \n",(((__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 =
 321                             (((__u16) port->number -
 322                               (__u16) (port->serial->minor)) + 1) << 8;
 323                         dbg("mos7840_get_uart_reg application number is %x\n",
 324                             Wval);
 325                 } else {
 326                         Wval =
 327                             (((__u16) port->number -
 328                               (__u16) (port->serial->minor)) + 2) << 8;
 329                         dbg("mos7840_get_uart_reg application number is %x\n",
 330                             Wval);
 331                 }
 332         }
 333         ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
 334                               MCS_RD_RTYPE, Wval, reg, val, VENDOR_READ_LENGTH,
 335                               MOS_WDR_TIMEOUT);
 336         *val = (*val) & 0x00ff;
 337         return ret;
 338 }
 339
 340 static void mos7840_dump_serial_port(struct moschip_port *mos7840_port)
 341 {
 342
 343         dbg("***************************************\n");
 344         dbg("SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
 345         dbg("ControlRegOffset is %2x \n", mos7840_port->ControlRegOffset);
 346         dbg("DCRRegOffset is %2x \n", mos7840_port->DcrRegOffset);
 347         dbg("***************************************\n");
 348
 349 }
 350
 351 /************************************************************************/
 352 /************************************************************************/
 353 /*             I N T E R F A C E   F U N C T I O N S                    */
 354 /*             I N T E R F A C E   F U N C T I O N S                    */
 355 /************************************************************************/
 356 /************************************************************************/
 357
 358 static inline void mos7840_set_port_private(struct usb_serial_port *port,
 359                                             struct moschip_port *data)
 360 {
 361         usb_set_serial_port_data(port, (void *)data);
 362 }
 363
 364 static inline struct moschip_port *mos7840_get_port_private(struct
 365                                                             usb_serial_port
 366                                                             *port)
 367 {
 368         return (struct moschip_port *)usb_get_serial_port_data(port);
 369 }
 370
 371 static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
 372 {
 373         struct moschip_port *mos7840_port;
 374         struct async_icount *icount;
 375         mos7840_port = port;
 376         icount = &mos7840_port->icount;
 377         if (new_msr &
 378             (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
 379              MOS_MSR_DELTA_CD)) {
 380                 icount = &mos7840_port->icount;
 381
 382                 /* update input line counters */
 383                 if (new_msr & MOS_MSR_DELTA_CTS) {
 384                         icount->cts++;
 385                         smp_wmb();
 386                 }
 387                 if (new_msr & MOS_MSR_DELTA_DSR) {
 388                         icount->dsr++;
 389                         smp_wmb();
 390                 }
 391                 if (new_msr & MOS_MSR_DELTA_CD) {
 392                         icount->dcd++;
 393                         smp_wmb();
 394                 }
 395                 if (new_msr & MOS_MSR_DELTA_RI) {
 396                         icount->rng++;
 397                         smp_wmb();
 398                 }
 399         }
 400 }
 401
 402 static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
 403 {
 404         struct async_icount *icount;
 405
 406         dbg("%s - %02x", __func__, new_lsr);
 407
 408         if (new_lsr & SERIAL_LSR_BI) {
 409                 //
 410                 // Parity and Framing errors only count if they
 411                 // occur exclusive of a break being
 412                 // received.
 413                 //
 414                 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
 415         }
 416
 417         /* update input line counters */
 418         icount = &port->icount;
 419         if (new_lsr & SERIAL_LSR_BI) {
 420                 icount->brk++;
 421                 smp_wmb();
 422         }
 423         if (new_lsr & SERIAL_LSR_OE) {
 424                 icount->overrun++;
 425                 smp_wmb();
 426         }
 427         if (new_lsr & SERIAL_LSR_PE) {
 428                 icount->parity++;
 429                 smp_wmb();
 430         }
 431         if (new_lsr & SERIAL_LSR_FE) {
 432                 icount->frame++;
 433                 smp_wmb();
 434         }
 435 }
 436
 437 /************************************************************************/
 438 /************************************************************************/
 439 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 440 /*            U S B  C A L L B A C K   F U N C T I O N S                */
 441 /************************************************************************/
 442 /************************************************************************/
 443
 444 static void mos7840_control_callback(struct urb *urb)
 445 {
 446         unsigned char *data;
 447         struct moschip_port *mos7840_port;
 448         __u8 regval = 0x0;
 449         int result = 0;
 450         int status = urb->status;
 451
 452         mos7840_port = urb->context;
 453
 454         switch (status) {
 455         case 0:
 456                 /* success */
 457                 break;
 458         case -ECONNRESET:
 459         case -ENOENT:
 460         case -ESHUTDOWN:
 461                 /* this urb is terminated, clean up */
 462                 dbg("%s - urb shutting down with status: %d", __func__,
 463                     status);
 464                 return;
 465         default:
 466                 dbg("%s - nonzero urb status received: %d", __func__,
 467                     status);
 468                 goto exit;
 469         }
 470
 471         dbg("%s urb buffer size is %d\n", __func__, urb->actual_length);
 472         dbg("%s mos7840_port->MsrLsr is %d port %d\n", __func__,
 473             mos7840_port->MsrLsr, mos7840_port->port_num);
 474         data = urb->transfer_buffer;
 475         regval = (__u8) data[0];
 476         dbg("%s data is %x\n", __func__, regval);
 477         if (mos7840_port->MsrLsr == 0)
 478                 mos7840_handle_new_msr(mos7840_port, regval);
 479         else if (mos7840_port->MsrLsr == 1)
 480                 mos7840_handle_new_lsr(mos7840_port, regval);
 481
 482 exit:
 483         spin_lock(&mos7840_port->pool_lock);
 484         if (!mos7840_port->zombie)
 485                 result = usb_submit_urb(mos7840_port->int_urb, GFP_ATOMIC);
 486         spin_unlock(&mos7840_port->pool_lock);
 487         if (result) {
 488                 dev_err(&urb->dev->dev,
 489                         "%s - Error %d submitting interrupt urb\n",
 490                         __func__, result);
 491         }
 492 }
 493
 494 static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
 495                            __u16 * val)
 496 {
 497         struct usb_device *dev = mcs->port->serial->dev;
 498         struct usb_ctrlrequest *dr = mcs->dr;
 499         unsigned char *buffer = mcs->ctrl_buf;
 500         int ret;
 501
 502         dr->bRequestType = MCS_RD_RTYPE;
 503         dr->bRequest = MCS_RDREQ;
 504         dr->wValue = cpu_to_le16(Wval); //0;
 505         dr->wIndex = cpu_to_le16(reg);
 506         dr->wLength = cpu_to_le16(2);
 507
 508         usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
 509                              (unsigned char *)dr, buffer, 2,
 510                              mos7840_control_callback, mcs);
 511         mcs->control_urb->transfer_buffer_length = 2;
 512         ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
 513         return ret;
 514 }
 515
 516 /*****************************************************************************
 517  * mos7840_interrupt_callback
 518  *      this is the callback function for when we have received data on the
 519  *      interrupt endpoint.
 520  *****************************************************************************/
 521
 522 static void mos7840_interrupt_callback(struct urb *urb)
 523 {
 524         int result;
 525         int length;
 526         struct moschip_port *mos7840_port;
 527         struct usb_serial *serial;
 528         __u16 Data;
 529         unsigned char *data;
 530         __u8 sp[5], st;
 531         int i, rv = 0;
 532         __u16 wval, wreg = 0;
 533         int status = urb->status;
 534
 535         dbg("%s", " : Entering\n");
 536
 537         switch (status) {
 538         case 0:
 539                 /* success */
 540                 break;
 541         case -ECONNRESET:
 542         case -ENOENT:
 543         case -ESHUTDOWN:
 544                 /* this urb is terminated, clean up */
 545                 dbg("%s - urb shutting down with status: %d", __func__,
 546                     status);
 547                 return;
 548         default:
 549                 dbg("%s - nonzero urb status received: %d", __func__,
 550                     status);
 551                 goto exit;
 552         }
 553
 554         length = urb->actual_length;
 555         data = urb->transfer_buffer;
 556
 557         serial = urb->context;
 558
 559         /* Moschip get 5 bytes
 560          * Byte 1 IIR Port 1 (port.number is 0)
 561          * Byte 2 IIR Port 2 (port.number is 1)
 562          * Byte 3 IIR Port 3 (port.number is 2)
 563          * Byte 4 IIR Port 4 (port.number is 3)
 564          * Byte 5 FIFO status for both */
 565
 566         if (length && length > 5) {
 567                 dbg("%s \n", "Wrong data !!!");
 568                 return;
 569         }
 570
 571         sp[0] = (__u8) data[0];
 572         sp[1] = (__u8) data[1];
 573         sp[2] = (__u8) data[2];
 574         sp[3] = (__u8) data[3];
 575         st = (__u8) data[4];
 576
 577         for (i = 0; i < serial->num_ports; i++) {
 578                 mos7840_port = mos7840_get_port_private(serial->port[i]);
 579                 wval =
 580                     (((__u16) serial->port[i]->number -
 581                       (__u16) (serial->minor)) + 1) << 8;
 582                 if (mos7840_port->open) {
 583                         if (sp[i] & 0x01) {
 584                                 dbg("SP%d No Interrupt !!!\n", i);
 585                         } else {
 586                                 switch (sp[i] & 0x0f) {
 587                                 case SERIAL_IIR_RLS:
 588                                         dbg("Serial Port %d: Receiver status error or ", i);
 589                                         dbg("address bit detected in 9-bit mode\n");
 590                                         mos7840_port->MsrLsr = 1;
 591                                         wreg = LINE_STATUS_REGISTER;
 592                                         break;
 593                                 case SERIAL_IIR_MS:
 594                                         dbg("Serial Port %d: Modem status change\n", i);
 595                                         mos7840_port->MsrLsr = 0;
 596                                         wreg = MODEM_STATUS_REGISTER;
 597                                         break;
 598                                 }
 599                                 spin_lock(&mos7840_port->pool_lock);
 600                                 if (!mos7840_port->zombie) {
 601                                         rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
 602                                 } else {
 603                                         spin_unlock(&mos7840_port->pool_lock);
 604                                         return;
 605                                 }
 606                                 spin_unlock(&mos7840_port->pool_lock);
 607                         }
 608                 }
 609         }
 610         if (!(rv < 0)) /* the completion handler for the control urb will resubmit */
 611                 return;
 612 exit:
 613         result = usb_submit_urb(urb, GFP_ATOMIC);
 614         if (result) {
 615                 dev_err(&urb->dev->dev,
 616                         "%s - Error %d submitting interrupt urb\n",
 617                         __func__, result);
 618         }
 619 }
 620
 621 static int mos7840_port_paranoia_check(struct usb_serial_port *port,
 622                                        const char *function)
 623 {
 624         if (!port) {
 625                 dbg("%s - port == NULL", function);
 626                 return -1;
 627         }
 628         if (!port->serial) {
 629                 dbg("%s - port->serial == NULL", function);
 630                 return -1;
 631         }
 632
 633         return 0;
 634 }
 635
 636 /* Inline functions to check the sanity of a pointer that is passed to us */
 637 static int mos7840_serial_paranoia_check(struct usb_serial *serial,
 638                                          const char *function)
 639 {
 640         if (!serial) {
 641                 dbg("%s - serial == NULL", function);
 642                 return -1;
 643         }
 644         if (!serial->type) {
 645                 dbg("%s - serial->type == NULL!", function);
 646                 return -1;
 647         }
 648
 649         return 0;
 650 }
 651
 652 static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
 653                                                  const char *function)
 654 {
 655         /* if no port was specified, or it fails a paranoia check */
 656         if (!port ||
 657             mos7840_port_paranoia_check(port, function) ||
 658             mos7840_serial_paranoia_check(port->serial, function)) {
 659                 /* then say that we don't have a valid usb_serial thing, which will
 660                  * end up genrating -ENODEV return values */
 661                 return NULL;
 662         }
 663
 664         return port->serial;
 665 }
 666
 667 /*****************************************************************************
 668  * mos7840_bulk_in_callback
 669  *      this is the callback function for when we have received data on the
 670  *      bulk in endpoint.
 671  *****************************************************************************/
 672
 673 static void mos7840_bulk_in_callback(struct urb *urb)
 674 {
 675         int retval;
 676         unsigned char *data;
 677         struct usb_serial *serial;
 678         struct usb_serial_port *port;
 679         struct moschip_port *mos7840_port;
 680         struct tty_struct *tty;
 681         int status = urb->status;
 682
 683         if (status) {
 684                 dbg("nonzero read bulk status received: %d", status);
 685                 return;
 686         }
 687
 688         mos7840_port = urb->context;
 689         if (!mos7840_port) {
 690                 dbg("%s", "NULL mos7840_port pointer \n");
 691                 return;
 692         }
 693
 694         port = (struct usb_serial_port *)mos7840_port->port;
 695         if (mos7840_port_paranoia_check(port, __func__)) {
 696                 dbg("%s", "Port Paranoia failed \n");
 697                 return;
 698         }
 699
 700         serial = mos7840_get_usb_serial(port, __func__);
 701         if (!serial) {
 702                 dbg("%s\n", "Bad serial pointer ");
 703                 return;
 704         }
 705
 706         dbg("%s\n", "Entering... \n");
 707
 708         data = urb->transfer_buffer;
 709
 710         dbg("%s", "Entering ........... \n");
 711
 712         if (urb->actual_length) {
 713                 tty = mos7840_port->port->port.tty;
 714                 if (tty) {
 715                         tty_buffer_request_room(tty, urb->actual_length);
 716                         tty_insert_flip_string(tty, data, urb->actual_length);
 717                         dbg(" %s \n", data);
 718                         tty_flip_buffer_push(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 serial data
 745  *      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 = mos7840_port->port->port.tty;
 778
 779         if (tty && mos7840_port->open)
 780                 tty_wakeup(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, GFP_KERNEL);
 852                 if (!urb->transfer_buffer) {
 853                         usb_free_urb(urb);
 854                         mos7840_port->write_urb_pool[j] = NULL;
 855                         err("%s-out of memory for urb buffers.", __func__);
 856                         continue;
 857                 }
 858         }
 859
 860 /*****************************************************************************
 861  * Initialize MCS7840 -- Write Init values to corresponding Registers
 862  *
 863  * Register Index
 864  * 1 : IER
 865  * 2 : FCR
 866  * 3 : LCR
 867  * 4 : MCR
 868  *
 869  * 0x08 : SP1/2 Control Reg
 870  *****************************************************************************/
 871
 872 //NEED to check the following Block
 873
 874         status = 0;
 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         status = 0;
 897         Data = 0x0;
 898         status =
 899             mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset, &Data);
 900         if (status < 0) {
 901                 dbg("Reading Controlreg failed\n");
 902                 return -1;
 903         }
 904         Data |= 0x08;           //Driver done bit
 905         Data |= 0x20;           //rx_disable
 906         status = mos7840_set_reg_sync(port, 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
 917         Data = 0x00;
 918         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 919         if (status < 0) {
 920                 dbg("disableing interrupts failed\n");
 921                 return -1;
 922         }
 923         // Set FIFO_CONTROL_REGISTER to the default value
 924         Data = 0x00;
 925         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 926         if (status < 0) {
 927                 dbg("Writing FIFO_CONTROL_REGISTER  failed\n");
 928                 return -1;
 929         }
 930
 931         Data = 0xcf;
 932         status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
 933         if (status < 0) {
 934                 dbg("Writing FIFO_CONTROL_REGISTER  failed\n");
 935                 return -1;
 936         }
 937
 938         Data = 0x03;
 939         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 940         mos7840_port->shadowLCR = Data;
 941
 942         Data = 0x0b;
 943         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
 944         mos7840_port->shadowMCR = Data;
 945
 946         Data = 0x00;
 947         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 948         mos7840_port->shadowLCR = Data;
 949
 950         Data |= SERIAL_LCR_DLAB;        //data latch enable in LCR 0x80
 951         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 952
 953         Data = 0x0c;
 954         status = 0;
 955         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
 956
 957         Data = 0x0;
 958         status = 0;
 959         status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
 960
 961         Data = 0x00;
 962         status = 0;
 963         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
 964
 965         Data = Data & ~SERIAL_LCR_DLAB;
 966         status = 0;
 967         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
 968         mos7840_port->shadowLCR = Data;
 969
 970         //clearing Bulkin and Bulkout Fifo
 971         Data = 0x0;
 972         status = 0;
 973         status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
 974
 975         Data = Data | 0x0c;
 976         status = 0;
 977         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 978
 979         Data = Data & ~0x0c;
 980         status = 0;
 981         status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
 982         //Finally enable all interrupts
 983         Data = 0x0;
 984         Data = 0x0c;
 985         status = 0;
 986         status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
 987
 988         //clearing rx_disable
 989         Data = 0x0;
 990         status = 0;
 991         status =
 992             mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset, &Data);
 993         Data = Data & ~0x20;
 994         status = 0;
 995         status =
 996             mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset, Data);
 997
 998         // rx_negate
 999         Data = 0x0;
1000         status = 0;
1001         status =
1002             mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset, &Data);
1003         Data = Data | 0x10;
1004         status = 0;
1005         status =
1006             mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset, Data);
1007
1008         /* force low_latency on so that our tty_push actually forces *
1009          * the data through,otherwise it is scheduled, and with      *
1010          * high data rates (like with OHCI) data can get lost.       */
1011
1012         if (tty)
1013                 tty->low_latency = 1;
1014 /* Check to see if we've set up our endpoint info yet    *
1015      * (can't set it up in mos7840_startup as the structures *
1016      * were not set up at that time.)                        */
1017         if (port0->open_ports == 1) {
1018                 if (serial->port[0]->interrupt_in_buffer == NULL) {
1019
1020                         /* set up interrupt urb */
1021
1022                         usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1023                                          serial->dev,
1024                                          usb_rcvintpipe(serial->dev,
1025                                                         serial->port[0]->
1026                                                         interrupt_in_endpointAddress),
1027                                          serial->port[0]->interrupt_in_buffer,
1028                                          serial->port[0]->interrupt_in_urb->
1029                                          transfer_buffer_length,
1030                                          mos7840_interrupt_callback,
1031                                          serial,
1032                                          serial->port[0]->interrupt_in_urb->
1033                                          interval);
1034
1035                         /* start interrupt read for mos7840               *
1036                          * will continue as long as mos7840 is connected  */
1037
1038                         response =
1039                             usb_submit_urb(serial->port[0]->interrupt_in_urb,
1040                                            GFP_KERNEL);
1041                         if (response) {
1042                                 err("%s - Error %d submitting interrupt urb",
1043                                     __func__, response);
1044                         }
1045
1046                 }
1047
1048         }
1049
1050         /* see if we've set up our endpoint info yet   *
1051          * (can't set it up in mos7840_startup as the  *
1052          * structures were not set up at that time.)   */
1053
1054         dbg("port number is %d \n", port->number);
1055         dbg("serial number is %d \n", port->serial->minor);
1056         dbg("Bulkin endpoint is %d \n", port->bulk_in_endpointAddress);
1057         dbg("BulkOut endpoint is %d \n", port->bulk_out_endpointAddress);
1058         dbg("Interrupt endpoint is %d \n", port->interrupt_in_endpointAddress);
1059         dbg("port's number in the device is %d\n", mos7840_port->port_num);
1060         mos7840_port->read_urb = port->read_urb;
1061
1062         /* set up our bulk in urb */
1063
1064         usb_fill_bulk_urb(mos7840_port->read_urb,
1065                           serial->dev,
1066                           usb_rcvbulkpipe(serial->dev,
1067                                           port->bulk_in_endpointAddress),
1068                           port->bulk_in_buffer,
1069                           mos7840_port->read_urb->transfer_buffer_length,
1070                           mos7840_bulk_in_callback, mos7840_port);
1071
1072         dbg("mos7840_open: bulkin endpoint is %d\n",
1073             port->bulk_in_endpointAddress);
1074         response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1075         if (response) {
1076                 err("%s - Error %d submitting control urb", __func__,
1077                     response);
1078         }
1079
1080         /* initialize our wait queues */
1081         init_waitqueue_head(&mos7840_port->wait_chase);
1082         init_waitqueue_head(&mos7840_port->delta_msr_wait);
1083
1084         /* initialize our icount structure */
1085         memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1086
1087         /* initialize our port settings */
1088         mos7840_port->shadowMCR = MCR_MASTER_IE;        /* Must set to enable ints! */
1089         /* send a open port command */
1090         mos7840_port->open = 1;
1091         //mos7840_change_port_settings(mos7840_port,old_termios);
1092         mos7840_port->icount.tx = 0;
1093         mos7840_port->icount.rx = 0;
1094
1095         dbg("\n\nusb_serial serial:%p       mos7840_port:%p\n      usb_serial_port port:%p\n\n", serial, mos7840_port, port);
1096
1097         return 0;
1098
1099 }
1100
1101 /*****************************************************************************
1102  * mos7840_chars_in_buffer
1103  *      this function is called by the tty driver when it wants to know how many
1104  *      bytes of data we currently have outstanding in the port (data that has
1105  *      been written, but hasn't made it out the port yet)
1106  *      If successful, we return the number of bytes left to be written in the
1107  *      system,
1108  *      Otherwise we return zero.
1109  *****************************************************************************/
1110
1111 static int mos7840_chars_in_buffer(struct tty_struct *tty)
1112 {
1113         struct usb_serial_port *port = tty->driver_data;
1114         int i;
1115         int chars = 0;
1116         unsigned long flags;
1117         struct moschip_port *mos7840_port;
1118
1119         dbg("%s \n", " mos7840_chars_in_buffer:entering ...........");
1120
1121         if (mos7840_port_paranoia_check(port, __func__)) {
1122                 dbg("%s", "Invalid port \n");
1123                 return 0;
1124         }
1125
1126         mos7840_port = mos7840_get_port_private(port);
1127         if (mos7840_port == NULL) {
1128                 dbg("%s \n", "mos7840_break:leaving ...........");
1129                 return 0;
1130         }
1131
1132         spin_lock_irqsave(&mos7840_port->pool_lock,flags);
1133         for (i = 0; i < NUM_URBS; ++i)
1134                 if (mos7840_port->busy[i])
1135                         chars += URB_TRANSFER_BUFFER_SIZE;
1136         spin_unlock_irqrestore(&mos7840_port->pool_lock,flags);
1137         dbg("%s - returns %d", __func__, chars);
1138         return chars;
1139
1140 }
1141
1142 /************************************************************************
1143  *
1144  * mos7840_block_until_tx_empty
1145  *
1146  *      This function will block the close until one of the following:
1147  *              1. TX count are 0
1148  *              2. The mos7840 has stopped
1149  *              3. A timeout of 3 seconds without activity has expired
1150  *
1151  ************************************************************************/
1152 static void mos7840_block_until_tx_empty(struct tty_struct *tty,
1153                                 struct moschip_port *mos7840_port)
1154 {
1155         int timeout = HZ / 10;
1156         int wait = 30;
1157         int count;
1158
1159         while (1) {
1160
1161                 count = mos7840_chars_in_buffer(tty);
1162
1163                 /* Check for Buffer status */
1164                 if (count <= 0) {
1165                         return;
1166                 }
1167
1168                 /* Block the thread for a while */
1169                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1170                                                timeout);
1171
1172                 /* No activity.. count down section */
1173                 wait--;
1174                 if (wait == 0) {
1175                         dbg("%s - TIMEOUT", __func__);
1176                         return;
1177                 } else {
1178                         /* Reset timeout value back to seconds */
1179                         wait = 30;
1180                 }
1181         }
1182 }
1183
1184 /*****************************************************************************
1185  * mos7840_close
1186  *      this function is called by the tty driver when a port is closed
1187  *****************************************************************************/
1188
1189 static void mos7840_close(struct tty_struct *tty,
1190                         struct usb_serial_port *port, struct file *filp)
1191 {
1192         struct usb_serial *serial;
1193         struct moschip_port *mos7840_port;
1194         struct moschip_port *port0;
1195         int j;
1196         __u16 Data;
1197
1198         dbg("%s\n", "mos7840_close:entering...");
1199
1200         if (mos7840_port_paranoia_check(port, __func__)) {
1201                 dbg("%s", "Port Paranoia failed \n");
1202                 return;
1203         }
1204
1205         serial = mos7840_get_usb_serial(port, __func__);
1206         if (!serial) {
1207                 dbg("%s", "Serial Paranoia failed \n");
1208                 return;
1209         }
1210
1211         mos7840_port = mos7840_get_port_private(port);
1212         port0 = mos7840_get_port_private(serial->port[0]);
1213
1214         if (mos7840_port == NULL || port0 == NULL)
1215                 return;
1216
1217         for (j = 0; j < NUM_URBS; ++j)
1218                 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1219
1220         /* Freeing Write URBs */
1221         for (j = 0; j < NUM_URBS; ++j) {
1222                 if (mos7840_port->write_urb_pool[j]) {
1223                         if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1224                                 kfree(mos7840_port->write_urb_pool[j]->
1225                                       transfer_buffer);
1226
1227                         usb_free_urb(mos7840_port->write_urb_pool[j]);
1228                 }
1229         }
1230
1231         if (serial->dev)
1232                 /* flush and block until tx is empty */
1233                 mos7840_block_until_tx_empty(tty, mos7840_port);
1234
1235         /* While closing port, shutdown all bulk read, write  *
1236          * and interrupt read if they exists                  */
1237         if (serial->dev) {
1238                 if (mos7840_port->write_urb) {
1239                         dbg("%s", "Shutdown bulk write\n");
1240                         usb_kill_urb(mos7840_port->write_urb);
1241                 }
1242                 if (mos7840_port->read_urb) {
1243                         dbg("%s", "Shutdown bulk read\n");
1244                         usb_kill_urb(mos7840_port->read_urb);
1245                 }
1246                 if ((&mos7840_port->control_urb)) {
1247                         dbg("%s", "Shutdown control read\n");
1248                         //      usb_kill_urb (mos7840_port->control_urb);
1249                 }
1250         }
1251 //      if(mos7840_port->ctrl_buf != NULL)
1252 //              kfree(mos7840_port->ctrl_buf);
1253         port0->open_ports--;
1254         dbg("mos7840_num_open_ports in close%d:in port%d\n",
1255             port0->open_ports, port->number);
1256         if (port0->open_ports == 0) {
1257                 if (serial->port[0]->interrupt_in_urb) {
1258                         dbg("%s", "Shutdown interrupt_in_urb\n");
1259                         usb_kill_urb(serial->port[0]->interrupt_in_urb);
1260                 }
1261         }
1262
1263         if (mos7840_port->write_urb) {
1264                 /* if this urb had a transfer buffer already (old tx) free it */
1265
1266                 if (mos7840_port->write_urb->transfer_buffer != NULL) {
1267                         kfree(mos7840_port->write_urb->transfer_buffer);
1268                 }
1269                 usb_free_urb(mos7840_port->write_urb);
1270         }
1271
1272         Data = 0x0;
1273         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1274
1275         Data = 0x00;
1276         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1277
1278         mos7840_port->open = 0;
1279
1280         dbg("%s \n", "Leaving ............");
1281 }
1282
1283 /************************************************************************
1284  *
1285  * mos7840_block_until_chase_response
1286  *
1287  *      This function will block the close until one of the following:
1288  *              1. Response to our Chase comes from mos7840
1289  *              2. A timeout of 10 seconds without activity has expired
1290  *                 (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1291  *
1292  ************************************************************************/
1293
1294 static void mos7840_block_until_chase_response(struct tty_struct *tty,
1295                                         struct moschip_port *mos7840_port)
1296 {
1297         int timeout = 1 * HZ;
1298         int wait = 10;
1299         int count;
1300
1301         while (1) {
1302                 count = mos7840_chars_in_buffer(tty);
1303
1304                 /* Check for Buffer status */
1305                 if (count <= 0) {
1306                         return;
1307                 }
1308
1309                 /* Block the thread for a while */
1310                 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1311                                                timeout);
1312                 /* No activity.. count down section */
1313                 wait--;
1314                 if (wait == 0) {
1315                         dbg("%s - TIMEOUT", __func__);
1316                         return;
1317                 } else {
1318                         /* Reset timeout value back to seconds */
1319                         wait = 10;
1320                 }
1321         }
1322
1323 }
1324
1325 /*****************************************************************************
1326  * mos7840_break
1327  *      this function sends a break to the port
1328  *****************************************************************************/
1329 static void mos7840_break(struct tty_struct *tty, int break_state)
1330 {
1331         struct usb_serial_port *port = tty->driver_data;
1332         unsigned char data;
1333         struct usb_serial *serial;
1334         struct moschip_port *mos7840_port;
1335
1336         dbg("%s \n", "Entering ...........");
1337         dbg("mos7840_break: Start\n");
1338
1339         if (mos7840_port_paranoia_check(port, __func__)) {
1340                 dbg("%s", "Port Paranoia failed \n");
1341                 return;
1342         }
1343
1344         serial = mos7840_get_usb_serial(port, __func__);
1345         if (!serial) {
1346                 dbg("%s", "Serial Paranoia failed \n");
1347                 return;
1348         }
1349
1350         mos7840_port = mos7840_get_port_private(port);
1351
1352         if (mos7840_port == NULL) {
1353                 return;
1354         }
1355
1356         if (serial->dev)
1357                 /* flush and block until tx is empty */
1358                 mos7840_block_until_chase_response(tty, mos7840_port);
1359
1360         if (break_state == -1)
1361                 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1362         else
1363                 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1364
1365         mos7840_port->shadowLCR = data;
1366         dbg("mcs7840_break mos7840_port->shadowLCR is %x\n",
1367             mos7840_port->shadowLCR);
1368         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1369                              mos7840_port->shadowLCR);
1370
1371         return;
1372 }
1373
1374 /*****************************************************************************
1375  * mos7840_write_room
1376  *      this function is called by the tty driver when it wants to know how many
1377  *      bytes of data we can accept for a specific port.
1378  *      If successful, we return the amount of room that we have for this port
1379  *      Otherwise we return a negative error number.
1380  *****************************************************************************/
1381
1382 static int mos7840_write_room(struct tty_struct *tty)
1383 {
1384         struct usb_serial_port *port = tty->driver_data;
1385         int i;
1386         int room = 0;
1387         unsigned long flags;
1388         struct moschip_port *mos7840_port;
1389
1390         dbg("%s \n", " mos7840_write_room:entering ...........");
1391
1392         if (mos7840_port_paranoia_check(port, __func__)) {
1393                 dbg("%s", "Invalid port \n");
1394                 dbg("%s \n", " mos7840_write_room:leaving ...........");
1395                 return -1;
1396         }
1397
1398         mos7840_port = mos7840_get_port_private(port);
1399         if (mos7840_port == NULL) {
1400                 dbg("%s \n", "mos7840_break:leaving ...........");
1401                 return -1;
1402         }
1403
1404         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1405         for (i = 0; i < NUM_URBS; ++i) {
1406                 if (!mos7840_port->busy[i]) {
1407                         room += URB_TRANSFER_BUFFER_SIZE;
1408                 }
1409         }
1410         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1411
1412         room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1413         dbg("%s - returns %d", __func__, room);
1414         return room;
1415
1416 }
1417
1418 /*****************************************************************************
1419  * mos7840_write
1420  *      this function is called by the tty driver when data should be written to
1421  *      the port.
1422  *      If successful, we return the number of bytes written, otherwise we
1423  *      return a negative error number.
1424  *****************************************************************************/
1425
1426 static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1427                          const unsigned char *data, int count)
1428 {
1429         int status;
1430         int i;
1431         int bytes_sent = 0;
1432         int transfer_size;
1433         unsigned long flags;
1434
1435         struct moschip_port *mos7840_port;
1436         struct usb_serial *serial;
1437         struct urb *urb;
1438         //__u16 Data;
1439         const unsigned char *current_position = data;
1440         unsigned char *data1;
1441         dbg("%s \n", "entering ...........");
1442         //dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",mos7840_port->shadowLCR);
1443
1444 #ifdef NOTMOS7840
1445         Data = 0x00;
1446         status = 0;
1447         status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1448         mos7840_port->shadowLCR = Data;
1449         dbg("mos7840_write: LINE_CONTROL_REGISTER is %x\n", Data);
1450         dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",
1451             mos7840_port->shadowLCR);
1452
1453         //Data = 0x03;
1454         //status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data);
1455         //mos7840_port->shadowLCR=Data;//Need to add later
1456
1457         Data |= SERIAL_LCR_DLAB;        //data latch enable in LCR 0x80
1458         status = 0;
1459         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1460
1461         //Data = 0x0c;
1462         //status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data);
1463         Data = 0x00;
1464         status = 0;
1465         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1466         dbg("mos7840_write:DLL value is %x\n", Data);
1467
1468         Data = 0x0;
1469         status = 0;
1470         status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1471         dbg("mos7840_write:DLM value is %x\n", Data);
1472
1473         Data = Data & ~SERIAL_LCR_DLAB;
1474         dbg("mos7840_write: mos7840_port->shadowLCR is %x\n",
1475             mos7840_port->shadowLCR);
1476         status = 0;
1477         status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1478 #endif
1479
1480         if (mos7840_port_paranoia_check(port, __func__)) {
1481                 dbg("%s", "Port Paranoia failed \n");
1482                 return -1;
1483         }
1484
1485         serial = port->serial;
1486         if (mos7840_serial_paranoia_check(serial, __func__)) {
1487                 dbg("%s", "Serial Paranoia failed \n");
1488                 return -1;
1489         }
1490
1491         mos7840_port = mos7840_get_port_private(port);
1492         if (mos7840_port == NULL) {
1493                 dbg("%s", "mos7840_port is NULL\n");
1494                 return -1;
1495         }
1496
1497         /* try to find a free urb in the list */
1498         urb = NULL;
1499
1500         spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1501         for (i = 0; i < NUM_URBS; ++i) {
1502                 if (!mos7840_port->busy[i]) {
1503                         mos7840_port->busy[i] = 1;
1504                         urb = mos7840_port->write_urb_pool[i];
1505                         dbg("\nURB:%d", i);
1506                         break;
1507                 }
1508         }
1509         spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1510
1511         if (urb == NULL) {
1512                 dbg("%s - no more free urbs", __func__);
1513                 goto exit;
1514         }
1515
1516         if (urb->transfer_buffer == NULL) {
1517                 urb->transfer_buffer =
1518                     kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1519
1520                 if (urb->transfer_buffer == NULL) {
1521                         err("%s no more kernel memory...", __func__);
1522                         goto exit;
1523                 }
1524         }
1525         transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1526
1527         memcpy(urb->transfer_buffer, current_position, transfer_size);
1528
1529         /* fill urb with data and submit  */
1530         usb_fill_bulk_urb(urb,
1531                           serial->dev,
1532                           usb_sndbulkpipe(serial->dev,
1533                                           port->bulk_out_endpointAddress),
1534                           urb->transfer_buffer,
1535                           transfer_size,
1536                           mos7840_bulk_out_data_callback, mos7840_port);
1537
1538         data1 = urb->transfer_buffer;
1539         dbg("\nbulkout endpoint is %d", port->bulk_out_endpointAddress);
1540
1541         /* send it down the pipe */
1542         status = usb_submit_urb(urb, GFP_ATOMIC);
1543
1544         if (status) {
1545                 mos7840_port->busy[i] = 0;
1546                 err("%s - usb_submit_urb(write bulk) failed with status = %d",
1547                     __func__, status);
1548                 bytes_sent = status;
1549                 goto exit;
1550         }
1551         bytes_sent = transfer_size;
1552         mos7840_port->icount.tx += transfer_size;
1553         smp_wmb();
1554         dbg("mos7840_port->icount.tx is %d:\n", mos7840_port->icount.tx);
1555 exit:
1556         return bytes_sent;
1557
1558 }
1559
1560 /*****************************************************************************
1561  * mos7840_throttle
1562  *      this function is called by the tty driver when it wants to stop the data
1563  *      being read from the port.
1564  *****************************************************************************/
1565
1566 static void mos7840_throttle(struct tty_struct *tty)
1567 {
1568         struct usb_serial_port *port = tty->driver_data;
1569         struct moschip_port *mos7840_port;
1570         int status;
1571
1572         if (mos7840_port_paranoia_check(port, __func__)) {
1573                 dbg("%s", "Invalid port \n");
1574                 return;
1575         }
1576
1577         dbg("- port %d\n", port->number);
1578
1579         mos7840_port = mos7840_get_port_private(port);
1580
1581         if (mos7840_port == NULL)
1582                 return;
1583
1584         if (!mos7840_port->open) {
1585                 dbg("%s\n", "port not opened");
1586                 return;
1587         }
1588
1589         dbg("%s", "Entering .......... \n");
1590
1591         /* if we are implementing XON/XOFF, send the stop character */
1592         if (I_IXOFF(tty)) {
1593                 unsigned char stop_char = STOP_CHAR(tty);
1594                 status = mos7840_write(tty, port, &stop_char, 1);
1595                 if (status <= 0)
1596                         return;
1597         }
1598         /* if we are implementing RTS/CTS, toggle that line */
1599         if (tty->termios->c_cflag & CRTSCTS) {
1600                 mos7840_port->shadowMCR &= ~MCR_RTS;
1601                 status = 0;
1602                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1603                                          mos7840_port->shadowMCR);
1604                 if (status < 0)
1605                         return;
1606         }
1607
1608         return;
1609 }
1610
1611 /*****************************************************************************
1612  * mos7840_unthrottle
1613  *      this function is called by the tty driver when it wants to resume the data
1614  *      being read from the port (called after SerialThrottle is called)
1615  *****************************************************************************/
1616 static void mos7840_unthrottle(struct tty_struct *tty)
1617 {
1618         struct usb_serial_port *port = tty->driver_data;
1619         int status;
1620         struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1621
1622         if (mos7840_port_paranoia_check(port, __func__)) {
1623                 dbg("%s", "Invalid port \n");
1624                 return;
1625         }
1626
1627         if (mos7840_port == NULL)
1628                 return;
1629
1630         if (!mos7840_port->open) {
1631                 dbg("%s - port not opened", __func__);
1632                 return;
1633         }
1634
1635         dbg("%s", "Entering .......... \n");
1636
1637         /* if we are implementing XON/XOFF, send the start character */
1638         if (I_IXOFF(tty)) {
1639                 unsigned char start_char = START_CHAR(tty);
1640                 status = mos7840_write(tty, port, &start_char, 1);
1641                 if (status <= 0)
1642                         return;
1643         }
1644
1645         /* if we are implementing RTS/CTS, toggle that line */
1646         if (tty->termios->c_cflag & CRTSCTS) {
1647                 mos7840_port->shadowMCR |= MCR_RTS;
1648                 status = 0;
1649                 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1650                                          mos7840_port->shadowMCR);
1651                 if (status < 0)
1652                         return;
1653         }
1654 }
1655
1656 static int mos7840_tiocmget(struct tty_struct *tty, struct file *file)
1657 {
1658         struct usb_serial_port *port = tty->driver_data;
1659         struct moschip_port *mos7840_port;
1660         unsigned int result;
1661         __u16 msr;
1662         __u16 mcr;
1663         int status = 0;
1664         mos7840_port = mos7840_get_port_private(port);
1665
1666         dbg("%s - port %d", __func__, port->number);
1667
1668         if (mos7840_port == NULL)
1669                 return -ENODEV;
1670
1671         status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1672         status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1673         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1674             | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1675             | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1676             | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1677             | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1678             | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1679             | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1680
1681         dbg("%s - 0x%04X", __func__, result);
1682
1683         return result;
1684 }
1685
1686 static int mos7840_tiocmset(struct tty_struct *tty, struct file *file,
1687                             unsigned int set, unsigned int clear)
1688 {
1689         struct usb_serial_port *port = tty->driver_data;
1690         struct moschip_port *mos7840_port;
1691         unsigned int mcr;
1692         int status;
1693
1694         dbg("%s - port %d", __func__, port->number);
1695
1696         mos7840_port = mos7840_get_port_private(port);
1697
1698         if (mos7840_port == NULL)
1699                 return -ENODEV;
1700
1701         /* FIXME: What locks the port registers ? */
1702         mcr = mos7840_port->shadowMCR;
1703         if (clear & TIOCM_RTS)
1704                 mcr &= ~MCR_RTS;
1705         if (clear & TIOCM_DTR)
1706                 mcr &= ~MCR_DTR;
1707         if (clear & TIOCM_LOOP)
1708                 mcr &= ~MCR_LOOPBACK;
1709
1710         if (set & TIOCM_RTS)
1711                 mcr |= MCR_RTS;
1712         if (set & TIOCM_DTR)
1713                 mcr |= MCR_DTR;
1714         if (set & TIOCM_LOOP)
1715                 mcr |= MCR_LOOPBACK;
1716
1717         mos7840_port->shadowMCR = mcr;
1718
1719         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1720         if (status < 0) {
1721                 dbg("setting MODEM_CONTROL_REGISTER Failed\n");
1722                 return status;
1723         }
1724
1725         return 0;
1726 }
1727
1728 /*****************************************************************************
1729  * mos7840_calc_baud_rate_divisor
1730  *      this function calculates the proper baud rate divisor for the specified
1731  *      baud rate.
1732  *****************************************************************************/
1733 static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1734                                           __u16 * clk_sel_val)
1735 {
1736
1737         dbg("%s - %d", __func__, baudRate);
1738
1739         if (baudRate <= 115200) {
1740                 *divisor = 115200 / baudRate;
1741                 *clk_sel_val = 0x0;
1742         }
1743         if ((baudRate > 115200) && (baudRate <= 230400)) {
1744                 *divisor = 230400 / baudRate;
1745                 *clk_sel_val = 0x10;
1746         } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1747                 *divisor = 403200 / baudRate;
1748                 *clk_sel_val = 0x20;
1749         } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1750                 *divisor = 460800 / baudRate;
1751                 *clk_sel_val = 0x30;
1752         } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1753                 *divisor = 806400 / baudRate;
1754                 *clk_sel_val = 0x40;
1755         } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1756                 *divisor = 921600 / baudRate;
1757                 *clk_sel_val = 0x50;
1758         } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1759                 *divisor = 1572864 / baudRate;
1760                 *clk_sel_val = 0x60;
1761         } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1762                 *divisor = 3145728 / baudRate;
1763                 *clk_sel_val = 0x70;
1764         }
1765         return 0;
1766
1767 #ifdef NOTMCS7840
1768
1769         for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1770                 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1771                         *divisor = mos7840_divisor_table[i].Divisor;
1772                         return 0;
1773                 }
1774         }
1775
1776         /* After trying for all the standard baud rates    *
1777          * Try calculating the divisor for this baud rate  */
1778
1779         if (baudrate > 75 && baudrate < 230400) {
1780                 /* get the divisor */
1781                 custom = (__u16) (230400L / baudrate);
1782
1783                 /* Check for round off */
1784                 round1 = (__u16) (2304000L / baudrate);
1785                 round = (__u16) (round1 - (custom * 10));
1786                 if (round > 4) {
1787                         custom++;
1788                 }
1789                 *divisor = custom;
1790
1791                 dbg(" Baud %d = %d\n", baudrate, custom);
1792                 return 0;
1793         }
1794
1795         dbg("%s\n", " Baud calculation Failed...");
1796         return -1;
1797 #endif
1798 }
1799
1800 /*****************************************************************************
1801  * mos7840_send_cmd_write_baud_rate
1802  *      this function sends the proper command to change the baud rate of the
1803  *      specified port.
1804  *****************************************************************************/
1805
1806 static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1807                                             int baudRate)
1808 {
1809         int divisor = 0;
1810         int status;
1811         __u16 Data;
1812         unsigned char number;
1813         __u16 clk_sel_val;
1814         struct usb_serial_port *port;
1815
1816         if (mos7840_port == NULL)
1817                 return -1;
1818
1819         port = (struct usb_serial_port *)mos7840_port->port;
1820         if (mos7840_port_paranoia_check(port, __func__)) {
1821                 dbg("%s", "Invalid port \n");
1822                 return -1;
1823         }
1824
1825         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1826                 dbg("%s", "Invalid Serial \n");
1827                 return -1;
1828         }
1829
1830         dbg("%s", "Entering .......... \n");
1831
1832         number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1833
1834         dbg("%s - port = %d, baud = %d", __func__,
1835             mos7840_port->port->number, baudRate);
1836         //reset clk_uart_sel in spregOffset
1837         if (baudRate > 115200) {
1838 #ifdef HW_flow_control
1839                 //NOTE: need to see the pther register to modify
1840                 //setting h/w flow control bit to 1;
1841                 status = 0;
1842                 Data = 0x2b;
1843                 mos7840_port->shadowMCR = Data;
1844                 status =
1845                     mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1846                 if (status < 0) {
1847                         dbg("Writing spreg failed in set_serial_baud\n");
1848                         return -1;
1849                 }
1850 #endif
1851
1852         } else {
1853 #ifdef HW_flow_control
1854                 //setting h/w flow control bit to 0;
1855                 status = 0;
1856                 Data = 0xb;
1857                 mos7840_port->shadowMCR = Data;
1858                 status =
1859                     mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1860                 if (status < 0) {
1861                         dbg("Writing spreg failed in set_serial_baud\n");
1862                         return -1;
1863                 }
1864 #endif
1865
1866         }
1867
1868         if (1)                  //baudRate <= 115200)
1869         {
1870                 clk_sel_val = 0x0;
1871                 Data = 0x0;
1872                 status = 0;
1873                 status =
1874                     mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1875                                                    &clk_sel_val);
1876                 status =
1877                     mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1878                                          &Data);
1879                 if (status < 0) {
1880                         dbg("reading spreg failed in set_serial_baud\n");
1881                         return -1;
1882                 }
1883                 Data = (Data & 0x8f) | clk_sel_val;
1884                 status = 0;
1885                 status =
1886                     mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1887                 if (status < 0) {
1888                         dbg("Writing spreg failed in set_serial_baud\n");
1889                         return -1;
1890                 }
1891                 /* Calculate the Divisor */
1892
1893                 if (status) {
1894                         err("%s - bad baud rate", __func__);
1895                         dbg("%s\n", "bad baud rate");
1896                         return status;
1897                 }
1898                 /* Enable access to divisor latch */
1899                 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1900                 mos7840_port->shadowLCR = Data;
1901                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1902
1903                 /* Write the divisor */
1904                 Data = (unsigned char)(divisor & 0xff);
1905                 dbg("set_serial_baud Value to write DLL is %x\n", Data);
1906                 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1907
1908                 Data = (unsigned char)((divisor & 0xff00) >> 8);
1909                 dbg("set_serial_baud Value to write DLM is %x\n", Data);
1910                 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1911
1912                 /* Disable access to divisor latch */
1913                 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1914                 mos7840_port->shadowLCR = Data;
1915                 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1916
1917         }
1918
1919         return status;
1920 }
1921
1922 /*****************************************************************************
1923  * mos7840_change_port_settings
1924  *      This routine is called to set the UART on the device to match
1925  *      the specified new settings.
1926  *****************************************************************************/
1927
1928 static void mos7840_change_port_settings(struct tty_struct *tty,
1929         struct moschip_port *mos7840_port, struct ktermios *old_termios)
1930 {
1931         int baud;
1932         unsigned cflag;
1933         unsigned iflag;
1934         __u8 lData;
1935         __u8 lParity;
1936         __u8 lStop;
1937         int status;
1938         __u16 Data;
1939         struct usb_serial_port *port;
1940         struct usb_serial *serial;
1941
1942         if (mos7840_port == NULL)
1943                 return;
1944
1945         port = (struct usb_serial_port *)mos7840_port->port;
1946
1947         if (mos7840_port_paranoia_check(port, __func__)) {
1948                 dbg("%s", "Invalid port \n");
1949                 return;
1950         }
1951
1952         if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1953                 dbg("%s", "Invalid Serial \n");
1954                 return;
1955         }
1956
1957         serial = port->serial;
1958
1959         dbg("%s - port %d", __func__, mos7840_port->port->number);
1960
1961         if (!mos7840_port->open) {
1962                 dbg("%s - port not opened", __func__);
1963                 return;
1964         }
1965
1966         dbg("%s", "Entering .......... \n");
1967
1968         lData = LCR_BITS_8;
1969         lStop = LCR_STOP_1;
1970         lParity = LCR_PAR_NONE;
1971
1972         cflag = tty->termios->c_cflag;
1973         iflag = tty->termios->c_iflag;
1974
1975         /* Change the number of bits */
1976         if (cflag & CSIZE) {
1977                 switch (cflag & CSIZE) {
1978                 case CS5:
1979                         lData = LCR_BITS_5;
1980                         break;
1981
1982                 case CS6:
1983                         lData = LCR_BITS_6;
1984                         break;
1985
1986                 case CS7:
1987                         lData = LCR_BITS_7;
1988                         break;
1989                 default:
1990                 case CS8:
1991                         lData = LCR_BITS_8;
1992                         break;
1993                 }
1994         }
1995         /* Change the Parity bit */
1996         if (cflag & PARENB) {
1997                 if (cflag & PARODD) {
1998                         lParity = LCR_PAR_ODD;
1999                         dbg("%s - parity = odd", __func__);
2000                 } else {
2001                         lParity = LCR_PAR_EVEN;
2002                         dbg("%s - parity = even", __func__);
2003                 }
2004
2005         } else {
2006                 dbg("%s - parity = none", __func__);
2007         }
2008
2009         if (cflag & CMSPAR) {
2010                 lParity = lParity | 0x20;
2011         }
2012
2013         /* Change the Stop bit */
2014         if (cflag & CSTOPB) {
2015                 lStop = LCR_STOP_2;
2016                 dbg("%s - stop bits = 2", __func__);
2017         } else {
2018                 lStop = LCR_STOP_1;
2019                 dbg("%s - stop bits = 1", __func__);
2020         }
2021
2022         /* Update the LCR with the correct value */
2023         mos7840_port->shadowLCR &=
2024             ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
2025         mos7840_port->shadowLCR |= (lData | lParity | lStop);
2026
2027         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x\n",
2028             mos7840_port->shadowLCR);
2029         /* Disable Interrupts */
2030         Data = 0x00;
2031         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2032
2033         Data = 0x00;
2034         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2035
2036         Data = 0xcf;
2037         mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2038
2039         /* Send the updated LCR value to the mos7840 */
2040         Data = mos7840_port->shadowLCR;
2041
2042         mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
2043
2044         Data = 0x00b;
2045         mos7840_port->shadowMCR = Data;
2046         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2047         Data = 0x00b;
2048         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2049
2050         /* set up the MCR register and send it to the mos7840 */
2051
2052         mos7840_port->shadowMCR = MCR_MASTER_IE;
2053         if (cflag & CBAUD) {
2054                 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
2055         }
2056
2057         if (cflag & CRTSCTS) {
2058                 mos7840_port->shadowMCR |= (MCR_XON_ANY);
2059
2060         } else {
2061                 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
2062         }
2063
2064         Data = mos7840_port->shadowMCR;
2065         mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2066
2067         /* Determine divisor based on baud rate */
2068         baud = tty_get_baud_rate(tty);
2069
2070         if (!baud) {
2071                 /* pick a default, any default... */
2072                 dbg("%s\n", "Picked default baud...");
2073                 baud = 9600;
2074         }
2075
2076         dbg("%s - baud rate = %d", __func__, baud);
2077         status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2078
2079         /* Enable Interrupts */
2080         Data = 0x0c;
2081         mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2082
2083         if (mos7840_port->read_urb->status != -EINPROGRESS) {
2084                 mos7840_port->read_urb->dev = serial->dev;
2085
2086                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2087
2088                 if (status) {
2089                         dbg(" usb_submit_urb(read bulk) failed, status = %d",
2090                             status);
2091                 }
2092         }
2093         wake_up(&mos7840_port->delta_msr_wait);
2094         mos7840_port->delta_msr_cond = 1;
2095         dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x\n",
2096             mos7840_port->shadowLCR);
2097
2098         return;
2099 }
2100
2101 /*****************************************************************************
2102  * mos7840_set_termios
2103  *      this function is called by the tty driver when it wants to change
2104  *      the termios structure
2105  *****************************************************************************/
2106
2107 static void mos7840_set_termios(struct tty_struct *tty,
2108                                 struct usb_serial_port *port,
2109                                 struct ktermios *old_termios)
2110 {
2111         int status;
2112         unsigned int cflag;
2113         struct usb_serial *serial;
2114         struct moschip_port *mos7840_port;
2115         dbg("mos7840_set_termios: START\n");
2116         if (mos7840_port_paranoia_check(port, __func__)) {
2117                 dbg("%s", "Invalid port \n");
2118                 return;
2119         }
2120
2121         serial = port->serial;
2122
2123         if (mos7840_serial_paranoia_check(serial, __func__)) {
2124                 dbg("%s", "Invalid Serial \n");
2125                 return;
2126         }
2127
2128         mos7840_port = mos7840_get_port_private(port);
2129
2130         if (mos7840_port == NULL)
2131                 return;
2132
2133         if (!mos7840_port->open) {
2134                 dbg("%s - port not opened", __func__);
2135                 return;
2136         }
2137
2138         dbg("%s\n", "setting termios - ");
2139
2140         cflag = tty->termios->c_cflag;
2141
2142         dbg("%s - clfag %08x iflag %08x", __func__,
2143             tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2144         dbg("%s - old clfag %08x old iflag %08x", __func__,
2145             old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2146         dbg("%s - port %d", __func__, port->number);
2147
2148         /* change the port settings to the new ones specified */
2149
2150         mos7840_change_port_settings(tty, mos7840_port, old_termios);
2151
2152         if (!mos7840_port->read_urb) {
2153                 dbg("%s", "URB KILLED !!!!!\n");
2154                 return;
2155         }
2156
2157         if (mos7840_port->read_urb->status != -EINPROGRESS) {
2158                 mos7840_port->read_urb->dev = serial->dev;
2159                 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2160                 if (status) {
2161                         dbg(" usb_submit_urb(read bulk) failed, status = %d",
2162                             status);
2163                 }
2164         }
2165         return;
2166 }
2167
2168 /*****************************************************************************
2169  * mos7840_get_lsr_info - get line status register info
2170  *
2171  * Purpose: Let user call ioctl() to get info when the UART physically
2172  *          is emptied.  On bus types like RS485, the transmitter must
2173  *          release the bus after transmitting. This must be done when
2174  *          the transmit shift register is empty, not be done when the
2175  *          transmit holding register is empty.  This functionality
2176  *          allows an RS485 driver to be written in user space.
2177  *****************************************************************************/
2178
2179 static int mos7840_get_lsr_info(struct tty_struct *tty,
2180                                 unsigned int __user *value)
2181 {
2182         int count;
2183         unsigned int result = 0;
2184
2185         count = mos7840_chars_in_buffer(tty);
2186         if (count == 0) {
2187                 dbg("%s -- Empty", __func__);
2188                 result = TIOCSER_TEMT;
2189         }
2190
2191         if (copy_to_user(value, &result, sizeof(int)))
2192                 return -EFAULT;
2193         return 0;
2194 }
2195
2196 /*****************************************************************************
2197  * mos7840_set_modem_info
2198  *      function to set modem info
2199  *****************************************************************************/
2200
2201 /* FIXME: Should be using the model control hooks */
2202
2203 static int mos7840_set_modem_info(struct moschip_port *mos7840_port,
2204                                   unsigned int cmd, unsigned int __user *value)
2205 {
2206         unsigned int mcr;
2207         unsigned int arg;
2208         __u16 Data;
2209         int status;
2210         struct usb_serial_port *port;
2211
2212         if (mos7840_port == NULL)
2213                 return -1;
2214
2215         port = (struct usb_serial_port *)mos7840_port->port;
2216         if (mos7840_port_paranoia_check(port, __func__)) {
2217                 dbg("%s", "Invalid port \n");
2218                 return -1;
2219         }
2220
2221         mcr = mos7840_port->shadowMCR;
2222
2223         if (copy_from_user(&arg, value, sizeof(int)))
2224                 return -EFAULT;
2225
2226         switch (cmd) {
2227         case TIOCMBIS:
2228                 if (arg & TIOCM_RTS)
2229                         mcr |= MCR_RTS;
2230                 if (arg & TIOCM_DTR)
2231                         mcr |= MCR_RTS;
2232                 if (arg & TIOCM_LOOP)
2233                         mcr |= MCR_LOOPBACK;
2234                 break;
2235
2236         case TIOCMBIC:
2237                 if (arg & TIOCM_RTS)
2238                         mcr &= ~MCR_RTS;
2239                 if (arg & TIOCM_DTR)
2240                         mcr &= ~MCR_RTS;
2241                 if (arg & TIOCM_LOOP)
2242                         mcr &= ~MCR_LOOPBACK;
2243                 break;
2244
2245         case TIOCMSET:
2246                 /* turn off the RTS and DTR and LOOPBACK
2247                  * and then only turn on what was asked to */
2248                 mcr &= ~(MCR_RTS | MCR_DTR | MCR_LOOPBACK);
2249                 mcr |= ((arg & TIOCM_RTS) ? MCR_RTS : 0);
2250                 mcr |= ((arg & TIOCM_DTR) ? MCR_DTR : 0);
2251                 mcr |= ((arg & TIOCM_LOOP) ? MCR_LOOPBACK : 0);
2252                 break;
2253         }
2254
2255         mos7840_port->shadowMCR = mcr;
2256
2257         Data = mos7840_port->shadowMCR;
2258         status = 0;
2259         status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2260         if (status < 0) {
2261                 dbg("setting MODEM_CONTROL_REGISTER Failed\n");
2262                 return -1;
2263         }
2264
2265         return 0;
2266 }
2267
2268 /*****************************************************************************
2269  * mos7840_get_modem_info
2270  *      function to get modem info
2271  *****************************************************************************/
2272
2273 static int mos7840_get_modem_info(struct moschip_port *mos7840_port,
2274                                   unsigned int __user *value)
2275 {
2276         unsigned int result = 0;
2277         __u16 msr;
2278         unsigned int mcr = mos7840_port->shadowMCR;
2279         int status = 0;
2280         status = mos7840_get_uart_reg(mos7840_port->port,
2281                                                 MODEM_STATUS_REGISTER, &msr);
2282         result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)      /* 0x002 */
2283             |((mcr & MCR_RTS) ? TIOCM_RTS : 0)  /* 0x004 */
2284             |((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)  /* 0x020 */
2285             |((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)   /* 0x040 */
2286             |((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)    /* 0x080 */
2287             |((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0); /* 0x100 */
2288
2289         dbg("%s -- %x", __func__, result);
2290
2291         if (copy_to_user(value, &result, sizeof(int)))
2292                 return -EFAULT;
2293         return 0;
2294 }
2295
2296 /*****************************************************************************
2297  * mos7840_get_serial_info
2298  *      function to get information about serial port
2299  *****************************************************************************/
2300
2301 static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2302                                    struct serial_struct __user *retinfo)
2303 {
2304         struct serial_struct tmp;
2305
2306         if (mos7840_port == NULL)
2307                 return -1;
2308
2309         if (!retinfo)
2310                 return -EFAULT;
2311
2312         memset(&tmp, 0, sizeof(tmp));
2313
2314         tmp.type = PORT_16550A;
2315         tmp.line = mos7840_port->port->serial->minor;
2316         tmp.port = mos7840_port->port->number;
2317         tmp.irq = 0;
2318         tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2319         tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2320         tmp.baud_base = 9600;
2321         tmp.close_delay = 5 * HZ;
2322         tmp.closing_wait = 30 * HZ;
2323
2324         if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2325                 return -EFAULT;
2326         return 0;
2327 }
2328
2329 /*****************************************************************************
2330  * SerialIoctl
2331  *      this function handles any ioctl calls to the driver
2332  *****************************************************************************/
2333
2334 static int mos7840_ioctl(struct tty_struct *tty, struct file *file,
2335                          unsigned int cmd, unsigned long arg)
2336 {
2337         struct usb_serial_port *port = tty->driver_data;
2338         void __user *argp = (void __user *)arg;
2339         struct moschip_port *mos7840_port;
2340
2341         struct async_icount cnow;
2342         struct async_icount cprev;
2343         struct serial_icounter_struct icount;
2344         int mosret = 0;
2345
2346         if (mos7840_port_paranoia_check(port, __func__)) {
2347                 dbg("%s", "Invalid port \n");
2348                 return -1;
2349         }
2350
2351         mos7840_port = mos7840_get_port_private(port);
2352
2353         if (mos7840_port == NULL)
2354                 return -1;
2355
2356         dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
2357
2358         switch (cmd) {
2359                 /* return number of bytes available */
2360
2361         case TIOCSERGETLSR:
2362                 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
2363                 return mos7840_get_lsr_info(tty, argp);
2364                 return 0;
2365
2366         /* FIXME: use the modem hooks and remove this */
2367         case TIOCMBIS:
2368         case TIOCMBIC:
2369         case TIOCMSET:
2370                 dbg("%s (%d) TIOCMSET/TIOCMBIC/TIOCMSET", __func__,
2371                     port->number);
2372                 mosret =
2373                     mos7840_set_modem_info(mos7840_port, cmd, argp);
2374                 return mosret;
2375
2376         case TIOCMGET:
2377                 dbg("%s (%d) TIOCMGET", __func__, port->number);
2378                 return mos7840_get_modem_info(mos7840_port, argp);
2379
2380         case TIOCGSERIAL:
2381                 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
2382                 return mos7840_get_serial_info(mos7840_port, argp);
2383
2384         case TIOCSSERIAL:
2385                 dbg("%s (%d) TIOCSSERIAL", __func__, port->number);
2386                 break;
2387
2388         case TIOCMIWAIT:
2389                 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
2390                 cprev = mos7840_port->icount;
2391                 while (1) {
2392                         //interruptible_sleep_on(&mos7840_port->delta_msr_wait);
2393                         mos7840_port->delta_msr_cond = 0;
2394                         wait_event_interruptible(mos7840_port->delta_msr_wait,
2395                                                  (mos7840_port->
2396                                                   delta_msr_cond == 1));
2397
2398                         /* see if a signal did it */
2399                         if (signal_pending(current))
2400                                 return -ERESTARTSYS;
2401                         cnow = mos7840_port->icount;
2402                         smp_rmb();
2403                         if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2404                             cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2405                                 return -EIO;    /* no change => error */
2406                         if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2407                             ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2408                             ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2409                             ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2410                                 return 0;
2411                         }
2412                         cprev = cnow;
2413                 }
2414                 /* NOTREACHED */
2415                 break;
2416
2417         case TIOCGICOUNT:
2418                 cnow = mos7840_port->icount;
2419                 smp_rmb();
2420                 icount.cts = cnow.cts;
2421                 icount.dsr = cnow.dsr;
2422                 icount.rng = cnow.rng;
2423                 icount.dcd = cnow.dcd;
2424                 icount.rx = cnow.rx;
2425                 icount.tx = cnow.tx;
2426                 icount.frame = cnow.frame;
2427                 icount.overrun = cnow.overrun;
2428                 icount.parity = cnow.parity;
2429                 icount.brk = cnow.brk;
2430                 icount.buf_overrun = cnow.buf_overrun;
2431
2432                 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
2433                     port->number, icount.rx, icount.tx);
2434                 if (copy_to_user(argp, &icount, sizeof(icount)))
2435                         return -EFAULT;
2436                 return 0;
2437         default:
2438                 break;
2439         }
2440         return -ENOIOCTLCMD;
2441 }
2442
2443 static int mos7840_calc_num_ports(struct usb_serial *serial)
2444 {
2445         int mos7840_num_ports = 0;
2446
2447         dbg("numberofendpoints: %d \n",
2448             (int)serial->interface->cur_altsetting->desc.bNumEndpoints);
2449         dbg("numberofendpoints: %d \n",
2450             (int)serial->interface->altsetting->desc.bNumEndpoints);
2451         if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) {
2452                 mos7840_num_ports = serial->num_ports = 2;
2453         } else if (serial->interface->cur_altsetting->desc.bNumEndpoints == 9) {
2454                 serial->num_bulk_in = 4;
2455                 serial->num_bulk_out = 4;
2456                 mos7840_num_ports = serial->num_ports = 4;
2457         }
2458
2459         return mos7840_num_ports;
2460 }
2461
2462 /****************************************************************************
2463  * mos7840_startup
2464  ****************************************************************************/
2465
2466 static int mos7840_startup(struct usb_serial *serial)
2467 {
2468         struct moschip_port *mos7840_port;
2469         struct usb_device *dev;
2470         int i, status;
2471
2472         __u16 Data;
2473         dbg("%s \n", " mos7840_startup :entering..........");
2474
2475         if (!serial) {
2476                 dbg("%s\n", "Invalid Handler");
2477                 return -1;
2478         }
2479
2480         dev = serial->dev;
2481
2482         dbg("%s\n", "Entering...");
2483
2484         /* we set up the pointers to the endpoints in the mos7840_open *
2485          * function, as the structures aren't created yet.             */
2486
2487         /* set up port private structures */
2488         for (i = 0; i < serial->num_ports; ++i) {
2489                 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2490                 if (mos7840_port == NULL) {
2491                         err("%s - Out of memory", __func__);
2492                         status = -ENOMEM;
2493                         i--; /* don't follow NULL pointer cleaning up */
2494                         goto error;
2495                 }
2496
2497                 /* Initialize all port interrupt end point to port 0 int endpoint *
2498                  * Our device has only one interrupt end point comman to all port */
2499
2500                 mos7840_port->port = serial->port[i];
2501                 mos7840_set_port_private(serial->port[i], mos7840_port);
2502                 spin_lock_init(&mos7840_port->pool_lock);
2503
2504                 mos7840_port->port_num = ((serial->port[i]->number -
2505                                            (serial->port[i]->serial->minor)) +
2506                                           1);
2507
2508                 if (mos7840_port->port_num == 1) {
2509                         mos7840_port->SpRegOffset = 0x0;
2510                         mos7840_port->ControlRegOffset = 0x1;
2511                         mos7840_port->DcrRegOffset = 0x4;
2512                 } else if ((mos7840_port->port_num == 2)
2513                            && (serial->num_ports == 4)) {
2514                         mos7840_port->SpRegOffset = 0x8;
2515                         mos7840_port->ControlRegOffset = 0x9;
2516                         mos7840_port->DcrRegOffset = 0x16;
2517                 } else if ((mos7840_port->port_num == 2)
2518                            && (serial->num_ports == 2)) {
2519                         mos7840_port->SpRegOffset = 0xa;
2520                         mos7840_port->ControlRegOffset = 0xb;
2521                         mos7840_port->DcrRegOffset = 0x19;
2522                 } else if ((mos7840_port->port_num == 3)
2523                            && (serial->num_ports == 4)) {
2524                         mos7840_port->SpRegOffset = 0xa;
2525                         mos7840_port->ControlRegOffset = 0xb;
2526                         mos7840_port->DcrRegOffset = 0x19;
2527                 } else if ((mos7840_port->port_num == 4)
2528                            && (serial->num_ports == 4)) {
2529                         mos7840_port->SpRegOffset = 0xc;
2530                         mos7840_port->ControlRegOffset = 0xd;
2531                         mos7840_port->DcrRegOffset = 0x1c;
2532                 }
2533                 mos7840_dump_serial_port(mos7840_port);
2534
2535                 mos7840_set_port_private(serial->port[i], mos7840_port);
2536
2537                 //enable rx_disable bit in control register
2538
2539                 status =
2540                     mos7840_get_reg_sync(serial->port[i],
2541                                          mos7840_port->ControlRegOffset, &Data);
2542                 if (status < 0) {
2543                         dbg("Reading ControlReg failed status-0x%x\n", status);
2544                         break;
2545                 } else
2546                         dbg("ControlReg Reading success val is %x, status%d\n",
2547                             Data, status);
2548                 Data |= 0x08;   //setting driver done bit
2549                 Data |= 0x04;   //sp1_bit to have cts change reflect in modem status reg
2550
2551                 //Data |= 0x20; //rx_disable bit
2552                 status = 0;
2553                 status =
2554                     mos7840_set_reg_sync(serial->port[i],
2555                                          mos7840_port->ControlRegOffset, Data);
2556                 if (status < 0) {
2557                         dbg("Writing ControlReg failed(rx_disable) status-0x%x\n", status);
2558                         break;
2559                 } else
2560                         dbg("ControlReg Writing success(rx_disable) status%d\n",
2561                             status);
2562
2563                 //Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2 and 0x24 in DCR3
2564                 Data = 0x01;
2565                 status = 0;
2566                 status =
2567                     mos7840_set_reg_sync(serial->port[i],
2568                                          (__u16) (mos7840_port->DcrRegOffset +
2569                                                   0), Data);
2570                 if (status < 0) {
2571                         dbg("Writing DCR0 failed status-0x%x\n", status);
2572                         break;
2573                 } else
2574                         dbg("DCR0 Writing success status%d\n", status);
2575
2576                 Data = 0x05;
2577                 status = 0;
2578                 status =
2579                     mos7840_set_reg_sync(serial->port[i],
2580                                          (__u16) (mos7840_port->DcrRegOffset +
2581                                                   1), Data);
2582                 if (status < 0) {
2583                         dbg("Writing DCR1 failed status-0x%x\n", status);
2584                         break;
2585                 } else
2586                         dbg("DCR1 Writing success status%d\n", status);
2587
2588                 Data = 0x24;
2589                 status = 0;
2590                 status =
2591                     mos7840_set_reg_sync(serial->port[i],
2592                                          (__u16) (mos7840_port->DcrRegOffset +
2593                                                   2), Data);
2594                 if (status < 0) {
2595                         dbg("Writing DCR2 failed status-0x%x\n", status);
2596                         break;
2597                 } else
2598                         dbg("DCR2 Writing success status%d\n", status);
2599
2600                 // write values in clkstart0x0 and clkmulti 0x20
2601                 Data = 0x0;
2602                 status = 0;
2603                 status =
2604                     mos7840_set_reg_sync(serial->port[i],
2605                                          CLK_START_VALUE_REGISTER, Data);
2606                 if (status < 0) {
2607                         dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
2608                         break;
2609                 } else
2610                         dbg("CLK_START_VALUE_REGISTER Writing success status%d\n", status);
2611
2612                 Data = 0x20;
2613                 status =
2614                     mos7840_set_reg_sync(serial->port[i], CLK_MULTI_REGISTER,
2615                                          Data);
2616                 if (status < 0) {
2617                         dbg("Writing CLK_MULTI_REGISTER failed status-0x%x\n",
2618                             status);
2619                         goto error;
2620                 } else
2621                         dbg("CLK_MULTI_REGISTER Writing success status%d\n",
2622                             status);
2623
2624                 //write value 0x0 to scratchpad register
2625                 Data = 0x00;
2626                 status =
2627                     mos7840_set_uart_reg(serial->port[i], SCRATCH_PAD_REGISTER,
2628                                          Data);
2629                 if (status < 0) {
2630                         dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x\n",
2631                             status);
2632                         break;
2633                 } else
2634                         dbg("SCRATCH_PAD_REGISTER Writing success status%d\n",
2635                             status);
2636
2637                 //Zero Length flag register
2638                 if ((mos7840_port->port_num != 1)
2639                     && (serial->num_ports == 2)) {
2640
2641                         Data = 0xff;
2642                         status = 0;
2643                         status = mos7840_set_reg_sync(serial->port[i],
2644                                                       (__u16) (ZLP_REG1 +
2645                                                                ((__u16)
2646                                                                 mos7840_port->
2647                                                                 port_num)),
2648                                                       Data);
2649                         dbg("ZLIP offset%x\n",
2650                             (__u16) (ZLP_REG1 +
2651                                      ((__u16) mos7840_port->port_num)));
2652                         if (status < 0) {
2653                                 dbg("Writing ZLP_REG%d failed status-0x%x\n",
2654                                     i + 2, status);
2655                                 break;
2656                         } else
2657                                 dbg("ZLP_REG%d Writing success status%d\n",
2658                                     i + 2, status);
2659                 } else {
2660                         Data = 0xff;
2661                         status = 0;
2662                         status = mos7840_set_reg_sync(serial->port[i],
2663                                                       (__u16) (ZLP_REG1 +
2664                                                                ((__u16)
2665                                                                 mos7840_port->
2666                                                                 port_num) -
2667                                                                0x1), Data);
2668                         dbg("ZLIP offset%x\n",
2669                             (__u16) (ZLP_REG1 +
2670                                      ((__u16) mos7840_port->port_num) - 0x1));
2671                         if (status < 0) {
2672                                 dbg("Writing ZLP_REG%d failed status-0x%x\n",
2673                                     i + 1, status);
2674                                 break;
2675                         } else
2676                                 dbg("ZLP_REG%d Writing success status%d\n",
2677                                     i + 1, status);
2678
2679                 }
2680                 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2681                 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2682                 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest), GFP_KERNEL);
2683                 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf || !mos7840_port->dr) {
2684                         status = -ENOMEM;
2685                         goto error;
2686                 }
2687         }
2688
2689         //Zero Length flag enable
2690         Data = 0x0f;
2691         status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2692         if (status < 0) {
2693                 dbg("Writing ZLP_REG5 failed status-0x%x\n", status);
2694                 goto error;
2695         } else
2696                 dbg("ZLP_REG5 Writing success status%d\n", status);
2697
2698         /* setting configuration feature to one */
2699         usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2700                         (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
2701         return 0;
2702 error:
2703         for (/* nothing */; i >= 0; i--) {
2704                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2705
2706                 kfree(mos7840_port->dr);
2707                 kfree(mos7840_port->ctrl_buf);
2708                 usb_free_urb(mos7840_port->control_urb);
2709                 kfree(mos7840_port);
2710                 serial->port[i] = NULL;
2711         }
2712         return status;
2713 }
2714
2715 /****************************************************************************
2716  * mos7840_shutdown
2717  *      This function is called whenever the device is removed from the usb bus.
2718  ****************************************************************************/
2719
2720 static void mos7840_shutdown(struct usb_serial *serial)
2721 {
2722         int i;
2723         unsigned long flags;
2724         struct moschip_port *mos7840_port;
2725         dbg("%s \n", " shutdown :entering..........");
2726
2727         if (!serial) {
2728                 dbg("%s", "Invalid Handler \n");
2729                 return;
2730         }
2731
2732         /*      check for the ports to be closed,close the ports and disconnect         */
2733
2734         /* free private structure allocated for serial port  *
2735          * stop reads and writes on all ports                */
2736
2737         for (i = 0; i < serial->num_ports; ++i) {
2738                 mos7840_port = mos7840_get_port_private(serial->port[i]);
2739                 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
2740                 mos7840_port->zombie = 1;
2741                 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
2742                 usb_kill_urb(mos7840_port->control_urb);
2743                 kfree(mos7840_port->ctrl_buf);
2744                 kfree(mos7840_port->dr);
2745                 kfree(mos7840_port);
2746                 mos7840_set_port_private(serial->port[i], NULL);
2747         }
2748
2749         dbg("%s\n", "Thank u :: ");
2750
2751 }
2752
2753 static struct usb_driver io_driver = {
2754         .name = "mos7840",
2755         .probe = usb_serial_probe,
2756         .disconnect = usb_serial_disconnect,
2757         .id_table = moschip_id_table_combined,
2758         .no_dynamic_id = 1,
2759 };
2760
2761 static struct usb_serial_driver moschip7840_4port_device = {
2762         .driver = {
2763                    .owner = THIS_MODULE,
2764                    .name = "mos7840",
2765                    },
2766         .description = DRIVER_DESC,
2767         .usb_driver = &io_driver,
2768         .id_table = moschip_port_id_table,
2769         .num_ports = 4,
2770         .open = mos7840_open,
2771         .close = mos7840_close,
2772         .write = mos7840_write,
2773         .write_room = mos7840_write_room,
2774         .chars_in_buffer = mos7840_chars_in_buffer,
2775         .throttle = mos7840_throttle,
2776         .unthrottle = mos7840_unthrottle,
2777         .calc_num_ports = mos7840_calc_num_ports,
2778 #ifdef MCSSerialProbe
2779         .probe = mos7840_serial_probe,
2780 #endif
2781         .ioctl = mos7840_ioctl,
2782         .set_termios = mos7840_set_termios,
2783         .break_ctl = mos7840_break,
2784         .tiocmget = mos7840_tiocmget,
2785         .tiocmset = mos7840_tiocmset,
2786         .attach = mos7840_startup,
2787         .shutdown = mos7840_shutdown,
2788         .read_bulk_callback = mos7840_bulk_in_callback,
2789         .read_int_callback = mos7840_interrupt_callback,
2790 };
2791
2792 /****************************************************************************
2793  * moschip7840_init
2794  *      This is called by the module subsystem, or on startup to initialize us
2795  ****************************************************************************/
2796 static int __init moschip7840_init(void)
2797 {
2798         int retval;
2799
2800         dbg("%s \n", " mos7840_init :entering..........");
2801
2802         /* Register with the usb serial */
2803         retval = usb_serial_register(&moschip7840_4port_device);
2804
2805         if (retval)
2806                 goto failed_port_device_register;
2807
2808         dbg("%s\n", "Entring...");
2809         info(DRIVER_DESC " " DRIVER_VERSION);
2810
2811         /* Register with the usb */
2812         retval = usb_register(&io_driver);
2813
2814         if (retval)
2815                 goto failed_usb_register;
2816
2817         if (retval == 0) {
2818                 dbg("%s\n", "Leaving...");
2819                 return 0;
2820         }
2821
2822       failed_usb_register:
2823         usb_serial_deregister(&moschip7840_4port_device);
2824
2825       failed_port_device_register:
2826
2827         return retval;
2828 }
2829
2830 /****************************************************************************
2831  * moschip7840_exit
2832  *      Called when the driver is about to be unloaded.
2833  ****************************************************************************/
2834 static void __exit moschip7840_exit(void)
2835 {
2836
2837         dbg("%s \n", " mos7840_exit :entering..........");
2838
2839         usb_deregister(&io_driver);
2840
2841         usb_serial_deregister(&moschip7840_4port_device);
2842
2843         dbg("%s\n", "Entring...");
2844 }
2845
2846 module_init(moschip7840_init);
2847 module_exit(moschip7840_exit);
2848
2849 /* Module information */
2850 MODULE_DESCRIPTION(DRIVER_DESC);
2851 MODULE_LICENSE("GPL");
2852
2853 module_param(debug, bool, S_IRUGO | S_IWUSR);
2854 MODULE_PARM_DESC(debug, "Debug enabled or not");