linux/drivers/usb/serial/mos7720.c
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   1/*
   2 * mos7720.c
   3 *   Controls the Moschip 7720 usb to dual port serial convertor
   4 *
   5 * Copyright 2006 Moschip Semiconductor Tech. Ltd.
   6 *
   7 * This program is free software; you can redistribute it and/or modify
   8 * it under the terms of the GNU General Public License as published by
   9 * the Free Software Foundation, version 2 of the License.
  10 *
  11 * Developed by:
  12 *      Vijaya Kumar <vijaykumar.gn@gmail.com>
  13 *      Ajay Kumar <naanuajay@yahoo.com>
  14 *      Gurudeva <ngurudeva@yahoo.com>
  15 *
  16 * Cleaned up from the original by:
  17 *      Greg Kroah-Hartman <gregkh@suse.de>
  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#include <linux/kernel.h>
  24#include <linux/errno.h>
  25#include <linux/init.h>
  26#include <linux/slab.h>
  27#include <linux/tty.h>
  28#include <linux/tty_driver.h>
  29#include <linux/tty_flip.h>
  30#include <linux/module.h>
  31#include <linux/spinlock.h>
  32#include <linux/serial.h>
  33#include <linux/serial_reg.h>
  34#include <linux/usb.h>
  35#include <linux/usb/serial.h>
  36#include <asm/uaccess.h>
  37
  38
  39/*
  40 * Version Information
  41 */
  42#define DRIVER_VERSION "1.0.0.4F"
  43#define DRIVER_AUTHOR "Aspire Communications pvt Ltd."
  44#define DRIVER_DESC "Moschip USB Serial Driver"
  45
  46/* default urb timeout */
  47#define MOS_WDR_TIMEOUT (HZ * 5)
  48
  49#define MOS_PORT1       0x0200
  50#define MOS_PORT2       0x0300
  51#define MOS_VENREG      0x0000
  52#define MOS_MAX_PORT    0x02
  53#define MOS_WRITE       0x0E
  54#define MOS_READ        0x0D
  55
  56/* Interrupt Rotinue Defines    */
  57#define SERIAL_IIR_RLS  0x06
  58#define SERIAL_IIR_RDA  0x04
  59#define SERIAL_IIR_CTI  0x0c
  60#define SERIAL_IIR_THR  0x02
  61#define SERIAL_IIR_MS   0x00
  62
  63#define NUM_URBS                        16      /* URB Count */
  64#define URB_TRANSFER_BUFFER_SIZE        32      /* URB Size */
  65
  66/* This structure holds all of the local port information */
  67struct moschip_port
  68{
  69        __u8    shadowLCR;              /* last LCR value received */
  70        __u8    shadowMCR;              /* last MCR value received */
  71        __u8    shadowMSR;              /* last MSR value received */
  72        char                    open;
  73        struct async_icount     icount;
  74        struct usb_serial_port  *port;  /* loop back to the owner */
  75        struct urb              *write_urb_pool[NUM_URBS];
  76};
  77
  78/* This structure holds all of the individual serial device information */
  79struct moschip_serial
  80{
  81        int interrupt_started;
  82};
  83
  84static int debug;
  85
  86#define USB_VENDOR_ID_MOSCHIP           0x9710
  87#define MOSCHIP_DEVICE_ID_7720          0x7720
  88#define MOSCHIP_DEVICE_ID_7715          0x7715
  89
  90static struct usb_device_id moschip_port_id_table [] = {
  91        { USB_DEVICE(USB_VENDOR_ID_MOSCHIP,MOSCHIP_DEVICE_ID_7720) },
  92        { } /* terminating entry */
  93};
  94MODULE_DEVICE_TABLE(usb, moschip_port_id_table);
  95
  96
  97/*
  98 * mos7720_interrupt_callback
  99 *      this is the callback function for when we have received data on the
 100 *      interrupt endpoint.
 101 */
 102static void mos7720_interrupt_callback(struct urb *urb)
 103{
 104        int result;
 105        int length;
 106        int status = urb->status;
 107        __u8 *data;
 108        __u8 sp1;
 109        __u8 sp2;
 110
 111        dbg("%s"," : Entering\n");
 112
 113        switch (status) {
 114        case 0:
 115                /* success */
 116                break;
 117        case -ECONNRESET:
 118        case -ENOENT:
 119        case -ESHUTDOWN:
 120                /* this urb is terminated, clean up */
 121                dbg("%s - urb shutting down with status: %d", __FUNCTION__,
 122                    status);
 123                return;
 124        default:
 125                dbg("%s - nonzero urb status received: %d", __FUNCTION__,
 126                    status);
 127                goto exit;
 128        }
 129
 130        length = urb->actual_length;
 131        data = urb->transfer_buffer;
 132
 133        /* Moschip get 4 bytes
 134         * Byte 1 IIR Port 1 (port.number is 0)
 135         * Byte 2 IIR Port 2 (port.number is 1)
 136         * Byte 3 --------------
 137         * Byte 4 FIFO status for both */
 138
 139        /* the above description is inverted
 140         *      oneukum 2007-03-14 */
 141
 142        if (unlikely(length != 4)) {
 143                dbg("Wrong data !!!");
 144                return;
 145        }
 146
 147        sp1 = data[3];
 148        sp2 = data[2];
 149
 150        if ((sp1 | sp2) & 0x01) {
 151                /* No Interrupt Pending in both the ports */
 152                dbg("No Interrupt !!!");
 153        } else {
 154                switch (sp1 & 0x0f) {
 155                case SERIAL_IIR_RLS:
 156                        dbg("Serial Port 1: Receiver status error or address "
 157                            "bit detected in 9-bit mode\n");
 158                        break;
 159                case SERIAL_IIR_CTI:
 160                        dbg("Serial Port 1: Receiver time out");
 161                        break;
 162                case SERIAL_IIR_MS:
 163                        dbg("Serial Port 1: Modem status change");
 164                        break;
 165                }
 166
 167                switch (sp2 & 0x0f) {
 168                case SERIAL_IIR_RLS:
 169                        dbg("Serial Port 2: Receiver status error or address "
 170                            "bit detected in 9-bit mode");
 171                        break;
 172                case SERIAL_IIR_CTI:
 173                        dbg("Serial Port 2: Receiver time out");
 174                        break;
 175                case SERIAL_IIR_MS:
 176                        dbg("Serial Port 2: Modem status change");
 177                        break;
 178                }
 179        }
 180
 181exit:
 182        result = usb_submit_urb(urb, GFP_ATOMIC);
 183        if (result)
 184                dev_err(&urb->dev->dev,
 185                        "%s - Error %d submitting control urb\n",
 186                        __FUNCTION__, result);
 187        return;
 188}
 189
 190/*
 191 * mos7720_bulk_in_callback
 192 *      this is the callback function for when we have received data on the
 193 *      bulk in endpoint.
 194 */
 195static void mos7720_bulk_in_callback(struct urb *urb)
 196{
 197        int retval;
 198        unsigned char *data ;
 199        struct usb_serial_port *port;
 200        struct moschip_port *mos7720_port;
 201        struct tty_struct *tty;
 202        int status = urb->status;
 203
 204        if (status) {
 205                dbg("nonzero read bulk status received: %d", status);
 206                return;
 207        }
 208
 209        mos7720_port = urb->context;
 210        if (!mos7720_port) {
 211                dbg("%s","NULL mos7720_port pointer \n");
 212                return ;
 213        }
 214
 215        port = mos7720_port->port;
 216
 217        dbg("Entering...%s", __FUNCTION__);
 218
 219        data = urb->transfer_buffer;
 220
 221        tty = port->tty;
 222        if (tty && urb->actual_length) {
 223                tty_buffer_request_room(tty, urb->actual_length);
 224                tty_insert_flip_string(tty, data, urb->actual_length);
 225                tty_flip_buffer_push(tty);
 226        }
 227
 228        if (!port->read_urb) {
 229                dbg("URB KILLED !!!");
 230                return;
 231        }
 232
 233        if (port->read_urb->status != -EINPROGRESS) {
 234                port->read_urb->dev = port->serial->dev;
 235
 236                retval = usb_submit_urb(port->read_urb, GFP_ATOMIC);
 237                if (retval)
 238                        dbg("usb_submit_urb(read bulk) failed, retval = %d",
 239                            retval);
 240        }
 241}
 242
 243/*
 244 * mos7720_bulk_out_data_callback
 245 *      this is the callback function for when we have finished sending serial
 246 *      data on the bulk out endpoint.
 247 */
 248static void mos7720_bulk_out_data_callback(struct urb *urb)
 249{
 250        struct moschip_port *mos7720_port;
 251        struct tty_struct *tty;
 252        int status = urb->status;
 253
 254        if (status) {
 255                dbg("nonzero write bulk status received:%d", status);
 256                return;
 257        }
 258
 259        mos7720_port = urb->context;
 260        if (!mos7720_port) {
 261                dbg("NULL mos7720_port pointer");
 262                return ;
 263        }
 264
 265        dbg("Entering .........");
 266
 267        tty = mos7720_port->port->tty;
 268
 269        if (tty && mos7720_port->open)
 270                tty_wakeup(tty);
 271}
 272
 273/*
 274 * send_mos_cmd
 275 *      this function will be used for sending command to device
 276 */
 277static int send_mos_cmd(struct usb_serial *serial, __u8 request, __u16 value,
 278                        __u16 index, void *data)
 279{
 280        int status;
 281        unsigned int pipe;
 282        u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
 283        __u8 requesttype;
 284        __u16 size = 0x0000;
 285
 286        if (value < MOS_MAX_PORT) {
 287                if (product == MOSCHIP_DEVICE_ID_7715) {
 288                        value = value*0x100+0x100;
 289                } else {
 290                        value = value*0x100+0x200;
 291                }
 292        } else {
 293                value = 0x0000;
 294                if ((product == MOSCHIP_DEVICE_ID_7715) &&
 295                    (index != 0x08)) {
 296                        dbg("serial->product== MOSCHIP_DEVICE_ID_7715");
 297                        //index = 0x01 ;
 298                }
 299        }
 300
 301        if (request == MOS_WRITE) {
 302                request = (__u8)MOS_WRITE;
 303                requesttype = (__u8)0x40;
 304                value  = value + (__u16)*((unsigned char *)data);
 305                data = NULL;
 306                pipe = usb_sndctrlpipe(serial->dev, 0);
 307        } else {
 308                request = (__u8)MOS_READ;
 309                requesttype = (__u8)0xC0;
 310                size = 0x01;
 311                pipe = usb_rcvctrlpipe(serial->dev,0);
 312        }
 313
 314        status = usb_control_msg(serial->dev, pipe, request, requesttype,
 315                                 value, index, data, size, MOS_WDR_TIMEOUT);
 316
 317        if (status < 0)
 318                dbg("Command Write failed Value %x index %x\n",value,index);
 319
 320        return status;
 321}
 322
 323static int mos7720_open(struct usb_serial_port *port, struct file * filp)
 324{
 325        struct usb_serial *serial;
 326        struct usb_serial_port *port0;
 327        struct urb *urb;
 328        struct moschip_serial *mos7720_serial;
 329        struct moschip_port *mos7720_port;
 330        int response;
 331        int port_number;
 332        char data;
 333        int allocated_urbs = 0;
 334        int j;
 335
 336        serial = port->serial;
 337
 338        mos7720_port = usb_get_serial_port_data(port);
 339        if (mos7720_port == NULL)
 340                return -ENODEV;
 341
 342        port0 = serial->port[0];
 343
 344        mos7720_serial = usb_get_serial_data(serial);
 345
 346        if (mos7720_serial == NULL || port0 == NULL)
 347                return -ENODEV;
 348
 349        usb_clear_halt(serial->dev, port->write_urb->pipe);
 350        usb_clear_halt(serial->dev, port->read_urb->pipe);
 351
 352        /* Initialising the write urb pool */
 353        for (j = 0; j < NUM_URBS; ++j) {
 354                urb = usb_alloc_urb(0,GFP_KERNEL);
 355                mos7720_port->write_urb_pool[j] = urb;
 356
 357                if (urb == NULL) {
 358                        err("No more urbs???");
 359                        continue;
 360                }
 361
 362                urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
 363                                               GFP_KERNEL);
 364                if (!urb->transfer_buffer) {
 365                        err("%s-out of memory for urb buffers.", __FUNCTION__);
 366                        usb_free_urb(mos7720_port->write_urb_pool[j]);
 367                        mos7720_port->write_urb_pool[j] = NULL;
 368                        continue;
 369                }
 370                allocated_urbs++;
 371        }
 372
 373        if (!allocated_urbs)
 374                return -ENOMEM;
 375
 376         /* Initialize MCS7720 -- Write Init values to corresponding Registers
 377          *
 378          * Register Index
 379          * 1 : IER
 380          * 2 : FCR
 381          * 3 : LCR
 382          * 4 : MCR
 383          *
 384          * 0x08 : SP1/2 Control Reg
 385          */
 386        port_number = port->number - port->serial->minor;
 387        send_mos_cmd(port->serial, MOS_READ, port_number, UART_LSR, &data);
 388        dbg("SS::%p LSR:%x\n",mos7720_port, data);
 389
 390        dbg("Check:Sending Command ..........");
 391
 392        data = 0x02;
 393        send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, 0x01, &data);
 394        data = 0x02;
 395        send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, 0x02, &data);
 396
 397        data = 0x00;
 398        send_mos_cmd(serial, MOS_WRITE, port_number, 0x01, &data);
 399        data = 0x00;
 400        send_mos_cmd(serial, MOS_WRITE, port_number, 0x02, &data);
 401
 402        data = 0xCF;
 403        send_mos_cmd(serial, MOS_WRITE, port_number, 0x02, &data);
 404        data = 0x03;
 405        mos7720_port->shadowLCR  = data;
 406        send_mos_cmd(serial, MOS_WRITE, port_number, 0x03, &data);
 407        data = 0x0b;
 408        mos7720_port->shadowMCR  = data;
 409        send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
 410        data = 0x0b;
 411        send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
 412
 413        data = 0x00;
 414        send_mos_cmd(serial, MOS_READ, MOS_MAX_PORT, 0x08, &data);
 415        data = 0x00;
 416        send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, 0x08, &data);
 417
 418/*      data = 0x00;
 419        send_mos_cmd(serial, MOS_READ, MOS_MAX_PORT, port_number + 1, &data);
 420        data = 0x03;
 421        send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, port_number + 1, &data);
 422        data = 0x00;
 423        send_mos_cmd(port->serial, MOS_WRITE, MOS_MAX_PORT, port_number + 1, &data);
 424*/
 425        data = 0x00;
 426        send_mos_cmd(serial, MOS_READ, MOS_MAX_PORT, 0x08, &data);
 427
 428        data = data | (port->number - port->serial->minor + 1);
 429        send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, 0x08, &data);
 430
 431        data = 0x83;
 432        mos7720_port->shadowLCR  = data;
 433        send_mos_cmd(serial, MOS_WRITE, port_number, 0x03, &data);
 434        data = 0x0c;
 435        send_mos_cmd(serial, MOS_WRITE, port_number, 0x00, &data);
 436        data = 0x00;
 437        send_mos_cmd(serial, MOS_WRITE, port_number, 0x01, &data);
 438        data = 0x03;
 439        mos7720_port->shadowLCR  = data;
 440        send_mos_cmd(serial, MOS_WRITE, port_number, 0x03, &data);
 441        data = 0x0c;
 442        send_mos_cmd(serial, MOS_WRITE, port_number, 0x01, &data);
 443        data = 0x0c;
 444        send_mos_cmd(serial, MOS_WRITE, port_number, 0x01, &data);
 445
 446//Matrix
 447
 448        /* force low_latency on so that our tty_push actually forces *
 449         * the data through,otherwise it is scheduled, and with      *
 450         * high data rates (like with OHCI) data can get lost.       */
 451
 452        if (port->tty)
 453                port->tty->low_latency = 1;
 454
 455        /* see if we've set up our endpoint info yet   *
 456         * (can't set it up in mos7720_startup as the  *
 457         * structures were not set up at that time.)   */
 458        if (!mos7720_serial->interrupt_started) {
 459                dbg("Interrupt buffer NULL !!!");
 460
 461                /* not set up yet, so do it now */
 462                mos7720_serial->interrupt_started = 1;
 463
 464                dbg("To Submit URB !!!");
 465
 466                /* set up our interrupt urb */
 467                usb_fill_int_urb(port0->interrupt_in_urb, serial->dev,
 468                                 usb_rcvintpipe(serial->dev,
 469                                                port->interrupt_in_endpointAddress),
 470                                 port0->interrupt_in_buffer,
 471                                 port0->interrupt_in_urb->transfer_buffer_length,
 472                                 mos7720_interrupt_callback, mos7720_port,
 473                                 port0->interrupt_in_urb->interval);
 474
 475                /* start interrupt read for this mos7720 this interrupt *
 476                 * will continue as long as the mos7720 is connected    */
 477                dbg("Submit URB over !!!");
 478                response = usb_submit_urb(port0->interrupt_in_urb, GFP_KERNEL);
 479                if (response)
 480                        dev_err(&port->dev,
 481                                "%s - Error %d submitting control urb\n",
 482                                __FUNCTION__, response);
 483        }
 484
 485        /* set up our bulk in urb */
 486        usb_fill_bulk_urb(port->read_urb, serial->dev,
 487                          usb_rcvbulkpipe(serial->dev,
 488                                          port->bulk_in_endpointAddress),
 489                          port->bulk_in_buffer,
 490                          port->read_urb->transfer_buffer_length,
 491                          mos7720_bulk_in_callback, mos7720_port);
 492        response = usb_submit_urb(port->read_urb, GFP_KERNEL);
 493        if (response)
 494                dev_err(&port->dev,
 495                        "%s - Error %d submitting read urb\n", __FUNCTION__, response);
 496
 497        /* initialize our icount structure */
 498        memset(&(mos7720_port->icount), 0x00, sizeof(mos7720_port->icount));
 499
 500        /* initialize our port settings */
 501        mos7720_port->shadowMCR = UART_MCR_OUT2; /* Must set to enable ints! */
 502
 503        /* send a open port command */
 504        mos7720_port->open = 1;
 505
 506        return 0;
 507}
 508
 509/*
 510 * mos7720_chars_in_buffer
 511 *      this function is called by the tty driver when it wants to know how many
 512 *      bytes of data we currently have outstanding in the port (data that has
 513 *      been written, but hasn't made it out the port yet)
 514 *      If successful, we return the number of bytes left to be written in the
 515 *      system,
 516 *      Otherwise we return a negative error number.
 517 */
 518static int mos7720_chars_in_buffer(struct usb_serial_port *port)
 519{
 520        int i;
 521        int chars = 0;
 522        struct moschip_port *mos7720_port;
 523
 524        dbg("%s:entering ...........", __FUNCTION__);
 525
 526        mos7720_port = usb_get_serial_port_data(port);
 527        if (mos7720_port == NULL) {
 528                dbg("%s:leaving ...........", __FUNCTION__);
 529                return -ENODEV;
 530        }
 531
 532        for (i = 0; i < NUM_URBS; ++i) {
 533                if (mos7720_port->write_urb_pool[i] && mos7720_port->write_urb_pool[i]->status == -EINPROGRESS)
 534                        chars += URB_TRANSFER_BUFFER_SIZE;
 535        }
 536        dbg("%s - returns %d", __FUNCTION__, chars);
 537        return chars;
 538}
 539
 540static void mos7720_close(struct usb_serial_port *port, struct file *filp)
 541{
 542        struct usb_serial *serial;
 543        struct moschip_port *mos7720_port;
 544        char data;
 545        int j;
 546
 547        dbg("mos7720_close:entering...");
 548
 549        serial = port->serial;
 550
 551        mos7720_port = usb_get_serial_port_data(port);
 552        if (mos7720_port == NULL)
 553                return;
 554
 555        for (j = 0; j < NUM_URBS; ++j)
 556                usb_kill_urb(mos7720_port->write_urb_pool[j]);
 557
 558        /* Freeing Write URBs */
 559        for (j = 0; j < NUM_URBS; ++j) {
 560                if (mos7720_port->write_urb_pool[j]) {
 561                        kfree(mos7720_port->write_urb_pool[j]->transfer_buffer);
 562                        usb_free_urb(mos7720_port->write_urb_pool[j]);
 563                }
 564        }
 565
 566        /* While closing port, shutdown all bulk read, write  *
 567         * and interrupt read if they exists, otherwise nop   */
 568        dbg("Shutdown bulk write");
 569        usb_kill_urb(port->write_urb);
 570        dbg("Shutdown bulk read");
 571        usb_kill_urb(port->read_urb);
 572
 573        mutex_lock(&serial->disc_mutex);
 574        /* these commands must not be issued if the device has
 575         * been disconnected */
 576        if (!serial->disconnected) {
 577                data = 0x00;
 578                send_mos_cmd(serial, MOS_WRITE, port->number - port->serial->minor,
 579                             0x04, &data);
 580
 581                data = 0x00;
 582                send_mos_cmd(serial, MOS_WRITE, port->number - port->serial->minor,
 583                             0x01, &data);
 584        }
 585        mutex_unlock(&serial->disc_mutex);
 586        mos7720_port->open = 0;
 587
 588        dbg("Leaving %s", __FUNCTION__);
 589}
 590
 591static void mos7720_break(struct usb_serial_port *port, int break_state)
 592{
 593        unsigned char data;
 594        struct usb_serial *serial;
 595        struct moschip_port *mos7720_port;
 596
 597        dbg("Entering %s", __FUNCTION__);
 598
 599        serial = port->serial;
 600
 601        mos7720_port = usb_get_serial_port_data(port);
 602        if (mos7720_port == NULL)
 603                return;
 604
 605        if (break_state == -1)
 606                data = mos7720_port->shadowLCR | UART_LCR_SBC;
 607        else
 608                data = mos7720_port->shadowLCR & ~UART_LCR_SBC;
 609
 610        mos7720_port->shadowLCR  = data;
 611        send_mos_cmd(serial, MOS_WRITE, port->number - port->serial->minor,
 612                     0x03, &data);
 613
 614        return;
 615}
 616
 617/*
 618 * mos7720_write_room
 619 *      this function is called by the tty driver when it wants to know how many
 620 *      bytes of data we can accept for a specific port.
 621 *      If successful, we return the amount of room that we have for this port
 622 *      Otherwise we return a negative error number.
 623 */
 624static int mos7720_write_room(struct usb_serial_port *port)
 625{
 626        struct moschip_port *mos7720_port;
 627        int room = 0;
 628        int i;
 629
 630        dbg("%s:entering ...........", __FUNCTION__);
 631
 632        mos7720_port = usb_get_serial_port_data(port);
 633        if (mos7720_port == NULL) {
 634                dbg("%s:leaving ...........", __FUNCTION__);
 635                return -ENODEV;
 636        }
 637
 638        for (i = 0; i < NUM_URBS; ++i) {
 639                if (mos7720_port->write_urb_pool[i] && mos7720_port->write_urb_pool[i]->status != -EINPROGRESS)
 640                        room += URB_TRANSFER_BUFFER_SIZE;
 641        }
 642
 643        dbg("%s - returns %d", __FUNCTION__, room);
 644        return room;
 645}
 646
 647static int mos7720_write(struct usb_serial_port *port,
 648                         const unsigned char *data, int count)
 649{
 650        int status;
 651        int i;
 652        int bytes_sent = 0;
 653        int transfer_size;
 654
 655        struct moschip_port *mos7720_port;
 656        struct usb_serial *serial;
 657        struct urb    *urb;
 658        const unsigned char *current_position = data;
 659
 660        dbg("%s:entering ...........", __FUNCTION__);
 661
 662        serial = port->serial;
 663
 664        mos7720_port = usb_get_serial_port_data(port);
 665        if (mos7720_port == NULL) {
 666                dbg("mos7720_port is NULL");
 667                return -ENODEV;
 668        }
 669
 670        /* try to find a free urb in the list */
 671        urb = NULL;
 672
 673        for (i = 0; i < NUM_URBS; ++i) {
 674                if (mos7720_port->write_urb_pool[i] && mos7720_port->write_urb_pool[i]->status != -EINPROGRESS) {
 675                        urb = mos7720_port->write_urb_pool[i];
 676                        dbg("URB:%d",i);
 677                        break;
 678                }
 679        }
 680
 681        if (urb == NULL) {
 682                dbg("%s - no more free urbs", __FUNCTION__);
 683                goto exit;
 684        }
 685
 686        if (urb->transfer_buffer == NULL) {
 687                urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
 688                                               GFP_KERNEL);
 689                if (urb->transfer_buffer == NULL) {
 690                        err("%s no more kernel memory...", __FUNCTION__);
 691                        goto exit;
 692                }
 693        }
 694        transfer_size = min (count, URB_TRANSFER_BUFFER_SIZE);
 695
 696        memcpy(urb->transfer_buffer, current_position, transfer_size);
 697        usb_serial_debug_data(debug, &port->dev, __FUNCTION__, transfer_size,
 698                              urb->transfer_buffer);
 699
 700        /* fill urb with data and submit  */
 701        usb_fill_bulk_urb(urb, serial->dev,
 702                          usb_sndbulkpipe(serial->dev,
 703                                          port->bulk_out_endpointAddress),
 704                          urb->transfer_buffer, transfer_size,
 705                          mos7720_bulk_out_data_callback, mos7720_port);
 706
 707        /* send it down the pipe */
 708        status = usb_submit_urb(urb,GFP_ATOMIC);
 709        if (status) {
 710                err("%s - usb_submit_urb(write bulk) failed with status = %d",
 711                    __FUNCTION__, status);
 712                bytes_sent = status;
 713                goto exit;
 714        }
 715        bytes_sent = transfer_size;
 716
 717exit:
 718        return bytes_sent;
 719}
 720
 721static void mos7720_throttle(struct usb_serial_port *port)
 722{
 723        struct moschip_port *mos7720_port;
 724        struct tty_struct *tty;
 725        int status;
 726
 727        dbg("%s- port %d\n", __FUNCTION__, port->number);
 728
 729        mos7720_port = usb_get_serial_port_data(port);
 730
 731        if (mos7720_port == NULL)
 732                return;
 733
 734        if (!mos7720_port->open) {
 735                dbg("port not opened");
 736                return;
 737        }
 738
 739        dbg("%s: Entering ..........", __FUNCTION__);
 740
 741        tty = port->tty;
 742        if (!tty) {
 743                dbg("%s - no tty available", __FUNCTION__);
 744                return;
 745        }
 746
 747        /* if we are implementing XON/XOFF, send the stop character */
 748        if (I_IXOFF(tty)) {
 749                unsigned char stop_char = STOP_CHAR(tty);
 750                status = mos7720_write(port, &stop_char, 1);
 751                if (status <= 0)
 752                        return;
 753        }
 754
 755        /* if we are implementing RTS/CTS, toggle that line */
 756        if (tty->termios->c_cflag & CRTSCTS) {
 757                mos7720_port->shadowMCR &= ~UART_MCR_RTS;
 758                status = send_mos_cmd(port->serial, MOS_WRITE,
 759                                      port->number - port->serial->minor,
 760                                      UART_MCR, &mos7720_port->shadowMCR);
 761                if (status != 0)
 762                        return;
 763        }
 764}
 765
 766static void mos7720_unthrottle(struct usb_serial_port *port)
 767{
 768        struct tty_struct *tty;
 769        int status;
 770        struct moschip_port *mos7720_port = usb_get_serial_port_data(port);
 771
 772        if (mos7720_port == NULL)
 773                return;
 774
 775        if (!mos7720_port->open) {
 776                dbg("%s - port not opened", __FUNCTION__);
 777                return;
 778        }
 779
 780        dbg("%s: Entering ..........", __FUNCTION__);
 781
 782        tty = port->tty;
 783        if (!tty) {
 784                dbg("%s - no tty available", __FUNCTION__);
 785                return;
 786        }
 787
 788        /* if we are implementing XON/XOFF, send the start character */
 789        if (I_IXOFF(tty)) {
 790                unsigned char start_char = START_CHAR(tty);
 791                status = mos7720_write(port, &start_char, 1);
 792                if (status <= 0)
 793                        return;
 794        }
 795
 796        /* if we are implementing RTS/CTS, toggle that line */
 797        if (tty->termios->c_cflag & CRTSCTS) {
 798                mos7720_port->shadowMCR |= UART_MCR_RTS;
 799                status = send_mos_cmd(port->serial, MOS_WRITE,
 800                                      port->number - port->serial->minor,
 801                                      UART_MCR, &mos7720_port->shadowMCR);
 802                if (status != 0)
 803                        return;
 804        }
 805}
 806
 807static int set_higher_rates(struct moschip_port *mos7720_port,
 808                            unsigned int baud)
 809{
 810        unsigned char data;
 811        struct usb_serial_port *port;
 812        struct usb_serial *serial;
 813        int port_number;
 814
 815        if (mos7720_port == NULL)
 816                return -EINVAL;
 817
 818        port = mos7720_port->port;
 819        serial = port->serial;
 820
 821        /***********************************************
 822         *      Init Sequence for higher rates
 823         ***********************************************/
 824        dbg("Sending Setting Commands ..........");
 825        port_number = port->number - port->serial->minor;
 826
 827        data = 0x000;
 828        send_mos_cmd(serial, MOS_WRITE, port_number, 0x01, &data);
 829        data = 0x000;
 830        send_mos_cmd(serial, MOS_WRITE, port_number, 0x02, &data);
 831        data = 0x0CF;
 832        send_mos_cmd(serial, MOS_WRITE, port->number, 0x02, &data);
 833        data = 0x00b;
 834        mos7720_port->shadowMCR  = data;
 835        send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
 836        data = 0x00b;
 837        send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
 838
 839        data = 0x000;
 840        send_mos_cmd(serial, MOS_READ, MOS_MAX_PORT, 0x08, &data);
 841        data = 0x000;
 842        send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, 0x08, &data);
 843
 844
 845        /***********************************************
 846         *              Set for higher rates           *
 847         ***********************************************/
 848
 849        data = baud * 0x10;
 850        send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, port_number + 1,&data);
 851
 852        data = 0x003;
 853        send_mos_cmd(serial, MOS_READ, MOS_MAX_PORT, 0x08, &data);
 854        data = 0x003;
 855        send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT, 0x08, &data);
 856
 857        data = 0x02b;
 858        mos7720_port->shadowMCR  = data;
 859        send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
 860        data = 0x02b;
 861        send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
 862
 863        /***********************************************
 864         *              Set DLL/DLM
 865         ***********************************************/
 866
 867        data = mos7720_port->shadowLCR | UART_LCR_DLAB;
 868        mos7720_port->shadowLCR  = data;
 869        send_mos_cmd(serial, MOS_WRITE, port_number, 0x03, &data);
 870
 871        data =  0x001; /* DLL */
 872        send_mos_cmd(serial, MOS_WRITE, port_number, 0x00, &data);
 873        data =  0x000; /* DLM */
 874        send_mos_cmd(serial, MOS_WRITE, port_number, 0x01, &data);
 875
 876        data = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
 877        mos7720_port->shadowLCR  = data;
 878        send_mos_cmd(serial, MOS_WRITE, port_number, 0x03, &data);
 879
 880        return 0;
 881}
 882
 883/* baud rate information */
 884struct divisor_table_entry
 885{
 886        __u32  baudrate;
 887        __u16  divisor;
 888};
 889
 890/* Define table of divisors for moschip 7720 hardware      *
 891 * These assume a 3.6864MHz crystal, the standard /16, and *
 892 * MCR.7 = 0.                                              */
 893static struct divisor_table_entry divisor_table[] = {
 894        {   50,         2304},
 895        {   110,        1047},  /* 2094.545455 => 230450   => .0217 % over */
 896        {   134,        857},   /* 1713.011152 => 230398.5 => .00065% under */
 897        {   150,        768},
 898        {   300,        384},
 899        {   600,        192},
 900        {   1200,       96},
 901        {   1800,       64},
 902        {   2400,       48},
 903        {   4800,       24},
 904        {   7200,       16},
 905        {   9600,       12},
 906        {   19200,      6},
 907        {   38400,      3},
 908        {   57600,      2},
 909        {   115200,     1},
 910};
 911
 912/*****************************************************************************
 913 * calc_baud_rate_divisor
 914 *      this function calculates the proper baud rate divisor for the specified
 915 *      baud rate.
 916 *****************************************************************************/
 917static int calc_baud_rate_divisor(int baudrate, int *divisor)
 918{
 919        int i;
 920        __u16 custom;
 921        __u16 round1;
 922        __u16 round;
 923
 924
 925        dbg("%s - %d", __FUNCTION__, baudrate);
 926
 927        for (i = 0; i < ARRAY_SIZE(divisor_table); i++) {
 928                if (divisor_table[i].baudrate == baudrate) {
 929                        *divisor = divisor_table[i].divisor;
 930                        return 0;
 931                }
 932        }
 933
 934        /* After trying for all the standard baud rates    *
 935         * Try calculating the divisor for this baud rate  */
 936        if (baudrate > 75 &&  baudrate < 230400) {
 937                /* get the divisor */
 938                custom = (__u16)(230400L  / baudrate);
 939
 940                /* Check for round off */
 941                round1 = (__u16)(2304000L / baudrate);
 942                round = (__u16)(round1 - (custom * 10));
 943                if (round > 4)
 944                        custom++;
 945                *divisor = custom;
 946
 947                dbg("Baud %d = %d",baudrate, custom);
 948                return 0;
 949        }
 950
 951        dbg("Baud calculation Failed...");
 952        return -EINVAL;
 953}
 954
 955/*
 956 * send_cmd_write_baud_rate
 957 *      this function sends the proper command to change the baud rate of the
 958 *      specified port.
 959 */
 960static int send_cmd_write_baud_rate(struct moschip_port *mos7720_port,
 961                                    int baudrate)
 962{
 963        struct usb_serial_port *port;
 964        struct usb_serial *serial;
 965        int divisor;
 966        int status;
 967        unsigned char data;
 968        unsigned char number;
 969
 970        if (mos7720_port == NULL)
 971                return -1;
 972
 973        port = mos7720_port->port;
 974        serial = port->serial;
 975
 976        dbg("%s: Entering ..........", __FUNCTION__);
 977
 978        number = port->number - port->serial->minor;
 979        dbg("%s - port = %d, baud = %d", __FUNCTION__, port->number, baudrate);
 980
 981        /* Calculate the Divisor */
 982        status = calc_baud_rate_divisor(baudrate, &divisor);
 983        if (status) {
 984                err("%s - bad baud rate", __FUNCTION__);
 985                return status;
 986        }
 987
 988        /* Enable access to divisor latch */
 989        data = mos7720_port->shadowLCR | UART_LCR_DLAB;
 990        mos7720_port->shadowLCR  = data;
 991        send_mos_cmd(serial, MOS_WRITE, number, UART_LCR, &data);
 992
 993        /* Write the divisor */
 994        data = ((unsigned char)(divisor & 0xff));
 995        send_mos_cmd(serial, MOS_WRITE, number, 0x00, &data);
 996
 997        data = ((unsigned char)((divisor & 0xff00) >> 8));
 998        send_mos_cmd(serial, MOS_WRITE, number, 0x01, &data);
 999
1000        /* Disable access to divisor latch */
1001        data = mos7720_port->shadowLCR & ~UART_LCR_DLAB;
1002        mos7720_port->shadowLCR = data;
1003        send_mos_cmd(serial, MOS_WRITE, number, 0x03, &data);
1004
1005        return status;
1006}
1007
1008/*
1009 * change_port_settings
1010 *      This routine is called to set the UART on the device to match
1011 *      the specified new settings.
1012 */
1013static void change_port_settings(struct moschip_port *mos7720_port,
1014                                 struct ktermios *old_termios)
1015{
1016        struct usb_serial_port *port;
1017        struct usb_serial *serial;
1018        struct tty_struct *tty;
1019        int baud;
1020        unsigned cflag;
1021        unsigned iflag;
1022        __u8 mask = 0xff;
1023        __u8 lData;
1024        __u8 lParity;
1025        __u8 lStop;
1026        int status;
1027        int port_number;
1028        char data;
1029
1030        if (mos7720_port == NULL)
1031                return ;
1032
1033        port = mos7720_port->port;
1034        serial = port->serial;
1035        port_number = port->number - port->serial->minor;
1036
1037        dbg("%s - port %d", __FUNCTION__, port->number);
1038
1039        if (!mos7720_port->open) {
1040                dbg("%s - port not opened", __FUNCTION__);
1041                return;
1042        }
1043
1044        tty = mos7720_port->port->tty;
1045
1046        dbg("%s: Entering ..........", __FUNCTION__);
1047
1048        lData = UART_LCR_WLEN8;
1049        lStop = 0x00;   /* 1 stop bit */
1050        lParity = 0x00; /* No parity */
1051
1052        cflag = tty->termios->c_cflag;
1053        iflag = tty->termios->c_iflag;
1054
1055        /* Change the number of bits */
1056        switch (cflag & CSIZE) {
1057        case CS5:
1058                lData = UART_LCR_WLEN5;
1059                mask = 0x1f;
1060                break;
1061
1062        case CS6:
1063                lData = UART_LCR_WLEN6;
1064                mask = 0x3f;
1065                break;
1066
1067        case CS7:
1068                lData = UART_LCR_WLEN7;
1069                mask = 0x7f;
1070                break;
1071        default:
1072        case CS8:
1073                lData = UART_LCR_WLEN8;
1074                break;
1075        }
1076
1077        /* Change the Parity bit */
1078        if (cflag & PARENB) {
1079                if (cflag & PARODD) {
1080                        lParity = UART_LCR_PARITY;
1081                        dbg("%s - parity = odd", __FUNCTION__);
1082                } else {
1083                        lParity = (UART_LCR_EPAR | UART_LCR_PARITY);
1084                        dbg("%s - parity = even", __FUNCTION__);
1085                }
1086
1087        } else {
1088                dbg("%s - parity = none", __FUNCTION__);
1089        }
1090
1091        if (cflag & CMSPAR)
1092                lParity = lParity | 0x20;
1093
1094        /* Change the Stop bit */
1095        if (cflag & CSTOPB) {
1096                lStop = UART_LCR_STOP;
1097                dbg("%s - stop bits = 2", __FUNCTION__);
1098        } else {
1099                lStop = 0x00;
1100                dbg("%s - stop bits = 1", __FUNCTION__);
1101        }
1102
1103#define LCR_BITS_MASK           0x03    /* Mask for bits/char field */
1104#define LCR_STOP_MASK           0x04    /* Mask for stop bits field */
1105#define LCR_PAR_MASK            0x38    /* Mask for parity field */
1106
1107        /* Update the LCR with the correct value */
1108        mos7720_port->shadowLCR &= ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1109        mos7720_port->shadowLCR |= (lData | lParity | lStop);
1110
1111
1112        /* Disable Interrupts */
1113        data = 0x00;
1114        send_mos_cmd(serial,MOS_WRITE,port->number - port->serial->minor, UART_IER, &data);
1115
1116        data = 0x00;
1117        send_mos_cmd(serial, MOS_WRITE, port_number, UART_FCR, &data);
1118
1119        data = 0xcf;
1120        send_mos_cmd(serial, MOS_WRITE, port_number, UART_FCR, &data);
1121
1122        /* Send the updated LCR value to the mos7720 */
1123        data = mos7720_port->shadowLCR;
1124        send_mos_cmd(serial, MOS_WRITE, port_number, UART_LCR, &data);
1125
1126        data = 0x00b;
1127        mos7720_port->shadowMCR = data;
1128        send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
1129        data = 0x00b;
1130        send_mos_cmd(serial, MOS_WRITE, port_number, 0x04, &data);
1131
1132        /* set up the MCR register and send it to the mos7720 */
1133        mos7720_port->shadowMCR = UART_MCR_OUT2;
1134        if (cflag & CBAUD)
1135                mos7720_port->shadowMCR |= (UART_MCR_DTR | UART_MCR_RTS);
1136
1137        if (cflag & CRTSCTS) {
1138                mos7720_port->shadowMCR |= (UART_MCR_XONANY);
1139
1140                /* To set hardware flow control to the specified *
1141                 * serial port, in SP1/2_CONTROL_REG             */
1142                if (port->number) {
1143                        data = 0x001;
1144                        send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT,
1145                                     0x08, &data);
1146                } else {
1147                        data = 0x002;
1148                        send_mos_cmd(serial, MOS_WRITE, MOS_MAX_PORT,
1149                                     0x08, &data);
1150                }
1151        } else {
1152                mos7720_port->shadowMCR &= ~(UART_MCR_XONANY);
1153        }
1154
1155        data = mos7720_port->shadowMCR;
1156        send_mos_cmd(serial, MOS_WRITE, port_number, UART_MCR, &data);
1157
1158        /* Determine divisor based on baud rate */
1159        baud = tty_get_baud_rate(tty);
1160        if (!baud) {
1161                /* pick a default, any default... */
1162                dbg("Picked default baud...");
1163                baud = 9600;
1164        }
1165
1166        if (baud >= 230400) {
1167                set_higher_rates(mos7720_port, baud);
1168                /* Enable Interrupts */
1169                data = 0x0c;
1170                send_mos_cmd(serial, MOS_WRITE, port_number, UART_IER, &data);
1171                return;
1172        }
1173
1174        dbg("%s - baud rate = %d", __FUNCTION__, baud);
1175        status = send_cmd_write_baud_rate(mos7720_port, baud);
1176        /* FIXME: needs to write actual resulting baud back not just
1177           blindly do so */
1178        if (cflag & CBAUD)
1179                tty_encode_baud_rate(tty, baud, baud);
1180        /* Enable Interrupts */
1181        data = 0x0c;
1182        send_mos_cmd(serial, MOS_WRITE, port_number, UART_IER, &data);
1183
1184        if (port->read_urb->status != -EINPROGRESS) {
1185                port->read_urb->dev = serial->dev;
1186
1187                status = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1188                if (status)
1189                        dbg("usb_submit_urb(read bulk) failed, status = %d",
1190                            status);
1191        }
1192        return;
1193}
1194
1195/*
1196 * mos7720_set_termios
1197 *      this function is called by the tty driver when it wants to change the
1198 *      termios structure.
1199 */
1200static void mos7720_set_termios(struct usb_serial_port *port,
1201                                struct ktermios *old_termios)
1202{
1203        int status;
1204        unsigned int cflag;
1205        struct usb_serial *serial;
1206        struct moschip_port *mos7720_port;
1207        struct tty_struct *tty;
1208
1209        serial = port->serial;
1210
1211        mos7720_port = usb_get_serial_port_data(port);
1212
1213        if (mos7720_port == NULL)
1214                return;
1215
1216        tty = port->tty;
1217
1218
1219        if (!mos7720_port->open) {
1220                dbg("%s - port not opened", __FUNCTION__);
1221                return;
1222        }
1223
1224        dbg("%s\n","setting termios - ASPIRE");
1225
1226        cflag = tty->termios->c_cflag;
1227
1228        dbg("%s - cflag %08x iflag %08x", __FUNCTION__,
1229            tty->termios->c_cflag,
1230            RELEVANT_IFLAG(tty->termios->c_iflag));
1231
1232        dbg("%s - old cflag %08x old iflag %08x", __FUNCTION__,
1233            old_termios->c_cflag,
1234            RELEVANT_IFLAG(old_termios->c_iflag));
1235
1236        dbg("%s - port %d", __FUNCTION__, port->number);
1237
1238        /* change the port settings to the new ones specified */
1239        change_port_settings(mos7720_port, old_termios);
1240
1241        if(!port->read_urb) {
1242                dbg("%s","URB KILLED !!!!!\n");
1243                return;
1244        }
1245
1246        if(port->read_urb->status != -EINPROGRESS) {
1247                port->read_urb->dev = serial->dev;
1248                status = usb_submit_urb(port->read_urb, GFP_ATOMIC);
1249                if (status)
1250                        dbg("usb_submit_urb(read bulk) failed, status = %d",
1251                            status);
1252        }
1253        return;
1254}
1255
1256/*
1257 * get_lsr_info - get line status register info
1258 *
1259 * Purpose: Let user call ioctl() to get info when the UART physically
1260 *          is emptied.  On bus types like RS485, the transmitter must
1261 *          release the bus after transmitting. This must be done when
1262 *          the transmit shift register is empty, not be done when the
1263 *          transmit holding register is empty.  This functionality
1264 *          allows an RS485 driver to be written in user space.
1265 */
1266static int get_lsr_info(struct moschip_port *mos7720_port,
1267                        unsigned int __user *value)
1268{
1269        int count;
1270        unsigned int result = 0;
1271
1272        count = mos7720_chars_in_buffer(mos7720_port->port);
1273        if (count == 0) {
1274                dbg("%s -- Empty", __FUNCTION__);
1275                result = TIOCSER_TEMT;
1276        }
1277
1278        if (copy_to_user(value, &result, sizeof(int)))
1279                return -EFAULT;
1280        return 0;
1281}
1282
1283/*
1284 * get_number_bytes_avail - get number of bytes available
1285 *
1286 * Purpose: Let user call ioctl to get the count of number of bytes available.
1287 */
1288static int get_number_bytes_avail(struct moschip_port *mos7720_port,
1289                                  unsigned int __user *value)
1290{
1291        unsigned int result = 0;
1292        struct tty_struct *tty = mos7720_port->port->tty;
1293
1294        if (!tty)
1295                return -ENOIOCTLCMD;
1296
1297        result = tty->read_cnt;
1298
1299        dbg("%s(%d) = %d", __FUNCTION__,  mos7720_port->port->number, result);
1300        if (copy_to_user(value, &result, sizeof(int)))
1301                return -EFAULT;
1302
1303        return -ENOIOCTLCMD;
1304}
1305
1306static int set_modem_info(struct moschip_port *mos7720_port, unsigned int cmd,
1307                          unsigned int __user *value)
1308{
1309        unsigned int mcr ;
1310        unsigned int arg;
1311        unsigned char data;
1312
1313        struct usb_serial_port *port;
1314
1315        if (mos7720_port == NULL)
1316                return -1;
1317
1318        port = (struct usb_serial_port*)mos7720_port->port;
1319        mcr = mos7720_port->shadowMCR;
1320
1321        if (copy_from_user(&arg, value, sizeof(int)))
1322                return -EFAULT;
1323
1324        switch (cmd) {
1325        case TIOCMBIS:
1326                if (arg & TIOCM_RTS)
1327                        mcr |= UART_MCR_RTS;
1328                if (arg & TIOCM_DTR)
1329                        mcr |= UART_MCR_RTS;
1330                if (arg & TIOCM_LOOP)
1331                        mcr |= UART_MCR_LOOP;
1332                break;
1333
1334        case TIOCMBIC:
1335                if (arg & TIOCM_RTS)
1336                        mcr &= ~UART_MCR_RTS;
1337                if (arg & TIOCM_DTR)
1338                        mcr &= ~UART_MCR_RTS;
1339                if (arg & TIOCM_LOOP)
1340                        mcr &= ~UART_MCR_LOOP;
1341                break;
1342
1343        case TIOCMSET:
1344                /* turn off the RTS and DTR and LOOPBACK
1345                 * and then only turn on what was asked to */
1346                mcr &=  ~(UART_MCR_RTS | UART_MCR_DTR | UART_MCR_LOOP);
1347                mcr |= ((arg & TIOCM_RTS) ? UART_MCR_RTS : 0);
1348                mcr |= ((arg & TIOCM_DTR) ? UART_MCR_DTR : 0);
1349                mcr |= ((arg & TIOCM_LOOP) ? UART_MCR_LOOP : 0);
1350                break;
1351        }
1352
1353        mos7720_port->shadowMCR = mcr;
1354
1355        data = mos7720_port->shadowMCR;
1356        send_mos_cmd(port->serial, MOS_WRITE,
1357                     port->number - port->serial->minor, UART_MCR, &data);
1358
1359        return 0;
1360}
1361
1362static int get_modem_info(struct moschip_port *mos7720_port,
1363                          unsigned int __user *value)
1364{
1365        unsigned int result = 0;
1366        unsigned int msr = mos7720_port->shadowMSR;
1367        unsigned int mcr = mos7720_port->shadowMCR;
1368
1369        result = ((mcr & UART_MCR_DTR)  ? TIOCM_DTR: 0)   /* 0x002 */
1370                  | ((mcr & UART_MCR_RTS)       ? TIOCM_RTS: 0)   /* 0x004 */
1371                  | ((msr & UART_MSR_CTS)       ? TIOCM_CTS: 0)   /* 0x020 */
1372                  | ((msr & UART_MSR_DCD)       ? TIOCM_CAR: 0)   /* 0x040 */
1373                  | ((msr & UART_MSR_RI)        ? TIOCM_RI:  0)   /* 0x080 */
1374                  | ((msr & UART_MSR_DSR)       ? TIOCM_DSR: 0);  /* 0x100 */
1375
1376
1377        dbg("%s -- %x", __FUNCTION__, result);
1378
1379        if (copy_to_user(value, &result, sizeof(int)))
1380                return -EFAULT;
1381        return 0;
1382}
1383
1384static int get_serial_info(struct moschip_port *mos7720_port,
1385                           struct serial_struct __user *retinfo)
1386{
1387        struct serial_struct tmp;
1388
1389        if (!retinfo)
1390                return -EFAULT;
1391
1392        memset(&tmp, 0, sizeof(tmp));
1393
1394        tmp.type                = PORT_16550A;
1395        tmp.line                = mos7720_port->port->serial->minor;
1396        tmp.port                = mos7720_port->port->number;
1397        tmp.irq                 = 0;
1398        tmp.flags               = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
1399        tmp.xmit_fifo_size      = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
1400        tmp.baud_base           = 9600;
1401        tmp.close_delay         = 5*HZ;
1402        tmp.closing_wait        = 30*HZ;
1403
1404        if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
1405                return -EFAULT;
1406        return 0;
1407}
1408
1409static int mos7720_ioctl(struct usb_serial_port *port, struct file *file,
1410                         unsigned int cmd, unsigned long arg)
1411{
1412        struct moschip_port *mos7720_port;
1413        struct async_icount cnow;
1414        struct async_icount cprev;
1415        struct serial_icounter_struct icount;
1416
1417        mos7720_port = usb_get_serial_port_data(port);
1418        if (mos7720_port == NULL)
1419                return -ENODEV;
1420
1421        dbg("%s - port %d, cmd = 0x%x", __FUNCTION__, port->number, cmd);
1422
1423        switch (cmd) {
1424        case TIOCINQ:
1425                /* return number of bytes available */
1426                dbg("%s (%d) TIOCINQ", __FUNCTION__,  port->number);
1427                return get_number_bytes_avail(mos7720_port,
1428                                              (unsigned int __user *)arg);
1429                break;
1430
1431        case TIOCSERGETLSR:
1432                dbg("%s (%d) TIOCSERGETLSR", __FUNCTION__,  port->number);
1433                return get_lsr_info(mos7720_port, (unsigned int __user *)arg);
1434                return 0;
1435
1436        case TIOCMBIS:
1437        case TIOCMBIC:
1438        case TIOCMSET:
1439                dbg("%s (%d) TIOCMSET/TIOCMBIC/TIOCMSET", __FUNCTION__,
1440                    port->number);
1441                return set_modem_info(mos7720_port, cmd,
1442                                      (unsigned int __user *)arg);
1443
1444        case TIOCMGET:
1445                dbg("%s (%d) TIOCMGET", __FUNCTION__,  port->number);
1446                return get_modem_info(mos7720_port,
1447                                      (unsigned int __user *)arg);
1448
1449        case TIOCGSERIAL:
1450                dbg("%s (%d) TIOCGSERIAL", __FUNCTION__,  port->number);
1451                return get_serial_info(mos7720_port,
1452                                       (struct serial_struct __user *)arg);
1453
1454        case TIOCSSERIAL:
1455                dbg("%s (%d) TIOCSSERIAL", __FUNCTION__,  port->number);
1456                break;
1457
1458        case TIOCMIWAIT:
1459                dbg("%s (%d) TIOCMIWAIT", __FUNCTION__,  port->number);
1460                cprev = mos7720_port->icount;
1461                while (1) {
1462                        if (signal_pending(current))
1463                                return -ERESTARTSYS;
1464                        cnow = mos7720_port->icount;
1465                        if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
1466                            cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
1467                                return -EIO; /* no change => error */
1468                        if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
1469                            ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
1470                            ((arg & TIOCM_CD)  && (cnow.dcd != cprev.dcd)) ||
1471                            ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts)) ) {
1472                                return 0;
1473                        }
1474                        cprev = cnow;
1475                }
1476                /* NOTREACHED */
1477                break;
1478
1479        case TIOCGICOUNT:
1480                cnow = mos7720_port->icount;
1481                icount.cts = cnow.cts;
1482                icount.dsr = cnow.dsr;
1483                icount.rng = cnow.rng;
1484                icount.dcd = cnow.dcd;
1485                icount.rx = cnow.rx;
1486                icount.tx = cnow.tx;
1487                icount.frame = cnow.frame;
1488                icount.overrun = cnow.overrun;
1489                icount.parity = cnow.parity;
1490                icount.brk = cnow.brk;
1491                icount.buf_overrun = cnow.buf_overrun;
1492
1493                dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __FUNCTION__,
1494                    port->number, icount.rx, icount.tx );
1495                if (copy_to_user((void __user *)arg, &icount, sizeof(icount)))
1496                        return -EFAULT;
1497                return 0;
1498        }
1499
1500        return -ENOIOCTLCMD;
1501}
1502
1503static int mos7720_startup(struct usb_serial *serial)
1504{
1505        struct moschip_serial *mos7720_serial;
1506        struct moschip_port *mos7720_port;
1507        struct usb_device *dev;
1508        int i;
1509        char data;
1510
1511        dbg("%s: Entering ..........", __FUNCTION__);
1512
1513        if (!serial) {
1514                dbg("Invalid Handler");
1515                return -ENODEV;
1516        }
1517
1518        dev = serial->dev;
1519
1520        /* create our private serial structure */
1521        mos7720_serial = kzalloc(sizeof(struct moschip_serial), GFP_KERNEL);
1522        if (mos7720_serial == NULL) {
1523                err("%s - Out of memory", __FUNCTION__);
1524                return -ENOMEM;
1525        }
1526
1527        usb_set_serial_data(serial, mos7720_serial);
1528
1529        /* we set up the pointers to the endpoints in the mos7720_open *
1530         * function, as the structures aren't created yet.             */
1531
1532        /* set up port private structures */
1533        for (i = 0; i < serial->num_ports; ++i) {
1534                mos7720_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
1535                if (mos7720_port == NULL) {
1536                        err("%s - Out of memory", __FUNCTION__);
1537                        usb_set_serial_data(serial, NULL);
1538                        kfree(mos7720_serial);
1539                        return -ENOMEM;
1540                }
1541
1542                /* Initialize all port interrupt end point to port 0 int
1543                 * endpoint.  Our device has only one interrupt endpoint
1544                 * comman to all ports */
1545                serial->port[i]->interrupt_in_endpointAddress = serial->port[0]->interrupt_in_endpointAddress;
1546
1547                mos7720_port->port = serial->port[i];
1548                usb_set_serial_port_data(serial->port[i], mos7720_port);
1549
1550                dbg("port number is %d", serial->port[i]->number);
1551                dbg("serial number is %d", serial->minor);
1552        }
1553
1554
1555        /* setting configuration feature to one */
1556        usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1557                        (__u8)0x03, 0x00,0x01,0x00, NULL, 0x00, 5*HZ);
1558
1559        send_mos_cmd(serial,MOS_READ,0x00, UART_LSR, &data);  // LSR For Port 1
1560        dbg("LSR:%x",data);
1561
1562        send_mos_cmd(serial,MOS_READ,0x01, UART_LSR, &data);  // LSR For Port 2
1563        dbg("LSR:%x",data);
1564
1565        return 0;
1566}
1567
1568static void mos7720_shutdown(struct usb_serial *serial)
1569{
1570        int i;
1571
1572        /* free private structure allocated for serial port */
1573        for (i=0; i < serial->num_ports; ++i) {
1574                kfree(usb_get_serial_port_data(serial->port[i]));
1575                usb_set_serial_port_data(serial->port[i], NULL);
1576        }
1577
1578        /* free private structure allocated for serial device */
1579        kfree(usb_get_serial_data(serial));
1580        usb_set_serial_data(serial, NULL);
1581}
1582
1583static struct usb_driver usb_driver = {
1584        .name =         "moschip7720",
1585        .probe =        usb_serial_probe,
1586        .disconnect =   usb_serial_disconnect,
1587        .id_table =     moschip_port_id_table,
1588        .no_dynamic_id =        1,
1589};
1590
1591static struct usb_serial_driver moschip7720_2port_driver = {
1592        .driver = {
1593                .owner =        THIS_MODULE,
1594                .name =         "moschip7720",
1595        },
1596        .description            = "Moschip 2 port adapter",
1597        .usb_driver             = &usb_driver,
1598        .id_table               = moschip_port_id_table,
1599        .num_interrupt_in       = 1,
1600        .num_bulk_in            = 2,
1601        .num_bulk_out           = 2,
1602        .num_ports              = 2,
1603        .open                   = mos7720_open,
1604        .close                  = mos7720_close,
1605        .throttle               = mos7720_throttle,
1606        .unthrottle             = mos7720_unthrottle,
1607        .attach                 = mos7720_startup,
1608        .shutdown               = mos7720_shutdown,
1609        .ioctl                  = mos7720_ioctl,
1610        .set_termios            = mos7720_set_termios,
1611        .write                  = mos7720_write,
1612        .write_room             = mos7720_write_room,
1613        .chars_in_buffer        = mos7720_chars_in_buffer,
1614        .break_ctl              = mos7720_break,
1615        .read_bulk_callback     = mos7720_bulk_in_callback,
1616        .read_int_callback      = mos7720_interrupt_callback,
1617};
1618
1619static int __init moschip7720_init(void)
1620{
1621        int retval;
1622
1623        dbg("%s: Entering ..........", __FUNCTION__);
1624
1625        /* Register with the usb serial */
1626        retval = usb_serial_register(&moschip7720_2port_driver);
1627        if (retval)
1628                goto failed_port_device_register;
1629
1630        info(DRIVER_DESC " " DRIVER_VERSION);
1631
1632        /* Register with the usb */
1633        retval = usb_register(&usb_driver);
1634        if (retval)
1635                goto failed_usb_register;
1636
1637        return 0;
1638
1639failed_usb_register:
1640        usb_serial_deregister(&moschip7720_2port_driver);
1641
1642failed_port_device_register:
1643        return retval;
1644}
1645
1646static void __exit moschip7720_exit(void)
1647{
1648        usb_deregister(&usb_driver);
1649        usb_serial_deregister(&moschip7720_2port_driver);
1650}
1651
1652module_init(moschip7720_init);
1653module_exit(moschip7720_exit);
1654
1655/* Module information */
1656MODULE_AUTHOR( DRIVER_AUTHOR );
1657MODULE_DESCRIPTION( DRIVER_DESC );
1658MODULE_LICENSE("GPL");
1659
1660module_param(debug, bool, S_IRUGO | S_IWUSR);
1661MODULE_PARM_DESC(debug, "Debug enabled or not");
1662
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