drivers/usb/serial/ipw.c

   1 /*
   2  * IPWireless 3G UMTS TDD Modem driver (USB connected)
   3  *
   4  *   Copyright (C) 2004 Roelf Diedericks <roelfd@inet.co.za>
   5  *   Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
   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; either version 2 of the License, or
  10  *   (at your option) any later version.
  11  *
  12  * All information about the device was acquired using SnoopyPro
  13  * on MSFT's O/S, and examing the MSFT drivers' debug output
  14  * (insanely left _on_ in the enduser version)
  15  *
  16  * It was written out of frustration with the IPWireless USB modem
  17  * supplied by Axity3G/Sentech South Africa not supporting
  18  * Linux whatsoever.
  19  *
  20  * Nobody provided any proprietary information that was not already
  21  * available for this device.
  22  *
  23  * The modem adheres to the "3GPP TS  27.007 AT command set for 3G
  24  * User Equipment (UE)" standard, available from
  25  * http://www.3gpp.org/ftp/Specs/html-info/27007.htm
  26  *
  27  * The code was only tested the IPWireless handheld modem distributed
  28  * in South Africa by Sentech.
  29  *
  30  * It may work for Woosh Inc in .nz too, as it appears they use the
  31  * same kit.
  32  *
  33  * There is still some work to be done in terms of handling
  34  * DCD, DTR, RTS, CTS which are currently faked.
  35  * It's good enough for PPP at this point. It's based off all kinds of
  36  * code found in usb/serial and usb/class
  37  *
  38  */
  39
  40 #include <linux/kernel.h>
  41 #include <linux/errno.h>
  42 #include <linux/init.h>
  43 #include <linux/slab.h>
  44 #include <linux/tty.h>
  45 #include <linux/tty_flip.h>
  46 #include <linux/module.h>
  47 #include <linux/spinlock.h>
  48 #include <linux/usb.h>
  49 #include <asm/uaccess.h>
  50 #include "usb-serial.h"
  51
  52 /*
  53  * Version Information
  54  */
  55 #define DRIVER_VERSION  "v0.3"
  56 #define DRIVER_AUTHOR   "Roelf Diedericks"
  57 #define DRIVER_DESC     "IPWireless tty driver"
  58
  59 #define IPW_TTY_MAJOR   240     /* real device node major id, experimental range */
  60 #define IPW_TTY_MINORS  256     /* we support 256 devices, dunno why, it'd be insane :) */
  61
  62 #define USB_IPW_MAGIC   0x6d02  /* magic number for ipw struct */
  63
  64
  65 /* Message sizes */
  66 #define EVENT_BUFFER_SIZE       0xFF
  67 #define CHAR2INT16(c1,c0)       (((u32)((c1) & 0xff) << 8) + (u32)((c0) & 0xff))
  68 #define NUM_BULK_URBS           24
  69 #define NUM_CONTROL_URBS        16
  70
  71 /* vendor/product pairs that are known work with this driver*/
  72 #define IPW_VID         0x0bc3
  73 #define IPW_PID         0x0001
  74
  75
  76 /* Vendor commands: */
  77
  78 /* baud rates */
  79 enum {
  80         ipw_sio_b256000 = 0x000e,
  81         ipw_sio_b128000 = 0x001d,
  82         ipw_sio_b115200 = 0x0020,
  83         ipw_sio_b57600  = 0x0040,
  84         ipw_sio_b56000  = 0x0042,
  85         ipw_sio_b38400  = 0x0060,
  86         ipw_sio_b19200  = 0x00c0,
  87         ipw_sio_b14400  = 0x0100,
  88         ipw_sio_b9600   = 0x0180,
  89         ipw_sio_b4800   = 0x0300,
  90         ipw_sio_b2400   = 0x0600,
  91         ipw_sio_b1200   = 0x0c00,
  92         ipw_sio_b600    = 0x1800
  93 };
  94
  95 /* data bits */
  96 #define ipw_dtb_7               0x700
  97 #define ipw_dtb_8               0x810   // ok so the define is misleading, I know, but forces 8,n,1
  98                                         // I mean, is there a point to any other setting these days? :)
  99
 100 /* usb control request types : */
 101 #define IPW_SIO_RXCTL           0x00    // control bulk rx channel transmissions, value=1/0 (on/off)
 102 #define IPW_SIO_SET_BAUD        0x01    // set baud, value=requested ipw_sio_bxxxx
 103 #define IPW_SIO_SET_LINE        0x03    // set databits, parity. value=ipw_dtb_x
 104 #define IPW_SIO_SET_PIN         0x03    // set/clear dtr/rts value=ipw_pin_xxx
 105 #define IPW_SIO_POLL            0x08    // get serial port status byte, call with value=0
 106 #define IPW_SIO_INIT            0x11    // initializes ? value=0 (appears as first thing todo on open)
 107 #define IPW_SIO_PURGE           0x12    // purge all transmissions?, call with value=numchar_to_purge
 108 #define IPW_SIO_HANDFLOW        0x13    // set xon/xoff limits value=0, and a buffer of 0x10 bytes
 109 #define IPW_SIO_SETCHARS        0x13    // set the flowcontrol special chars, value=0, buf=6 bytes,
 110                                         // last 2 bytes contain flowcontrol chars e.g. 00 00 00 00 11 13
 111
 112 /* values used for request IPW_SIO_SET_PIN */
 113 #define IPW_PIN_SETDTR          0x101
 114 #define IPW_PIN_SETRTS          0x202
 115 #define IPW_PIN_CLRDTR          0x100
 116 #define IPW_PIN_CLRRTS          0x200 // unconfirmed
 117
 118 /* values used for request IPW_SIO_RXCTL */
 119 #define IPW_RXBULK_ON           1
 120 #define IPW_RXBULK_OFF          0
 121
 122 /* various 16 byte hardcoded transferbuffers used by flow control */
 123 #define IPW_BYTES_FLOWINIT      { 0x01, 0, 0, 0, 0x40, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
 124
 125 /* Interpretation of modem status lines */
 126 /* These need sorting out by individually connecting pins and checking
 127  * results. FIXME!
 128  * When data is being sent we see 0x30 in the lower byte; this must
 129  * contain DSR and CTS ...
 130  */
 131 #define IPW_DSR                 ((1<<4) | (1<<5))
 132 #define IPW_CTS                 ((1<<5) | (1<<4))
 133
 134 #define IPW_WANTS_TO_SEND       0x30
 135 //#define IPW_DTR                       /* Data Terminal Ready */
 136 //#define IPW_CTS                       /* Clear To Send */
 137 //#define IPW_CD                        /* Carrier Detect */
 138 //#define IPW_DSR                       /* Data Set Ready */
 139 //#define IPW_RxD                       /* Receive pin */
 140
 141 //#define IPW_LE
 142 //#define IPW_RTS
 143 //#define IPW_ST
 144 //#define IPW_SR
 145 //#define IPW_RI                        /* Ring Indicator */
 146
 147 static struct usb_device_id usb_ipw_ids[] = {
 148         { USB_DEVICE(IPW_VID, IPW_PID) },
 149         { },
 150 };
 151
 152 MODULE_DEVICE_TABLE(usb, usb_ipw_ids);
 153
 154 static struct usb_driver usb_ipw_driver = {
 155         .name =         "ipwtty",
 156         .probe =        usb_serial_probe,
 157         .disconnect =   usb_serial_disconnect,
 158         .id_table =     usb_ipw_ids,
 159         .no_dynamic_id =        1,
 160 };
 161
 162 static int debug;
 163
 164 static void ipw_read_bulk_callback(struct urb *urb, struct pt_regs *regs)
 165 {
 166         struct usb_serial_port *port = urb->context;
 167         unsigned char *data = urb->transfer_buffer;
 168         struct tty_struct *tty;
 169         int i;
 170         int result;
 171
 172         dbg("%s - port %d", __FUNCTION__, port->number);
 173
 174         if (urb->status) {
 175                 dbg("%s - nonzero read bulk status received: %d", __FUNCTION__, urb->status);
 176                 return;
 177         }
 178
 179         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
 180
 181         tty = port->tty;
 182         if (tty && urb->actual_length) {
 183                 for (i = 0; i < urb->actual_length ; ++i) {
 184                         /* if we insert more than TTY_FLIPBUF_SIZE characters, we drop them. */
 185                         if(tty->flip.count >= TTY_FLIPBUF_SIZE) {
 186                                 tty_flip_buffer_push(tty);
 187                         }
 188                         /* this doesn't actually push the data through unless tty->low_latency is set */
 189                         tty_insert_flip_char(tty, data[i], 0);
 190                 }
 191                 tty_flip_buffer_push(tty);
 192         }
 193
 194         /* Continue trying to always read  */
 195         usb_fill_bulk_urb (port->read_urb, port->serial->dev,
 196                            usb_rcvbulkpipe(port->serial->dev,
 197                                            port->bulk_in_endpointAddress),
 198                            port->read_urb->transfer_buffer,
 199                            port->read_urb->transfer_buffer_length,
 200                            ipw_read_bulk_callback, port);
 201         result = usb_submit_urb(port->read_urb, GFP_ATOMIC);
 202         if (result)
 203                 dev_err(&port->dev, "%s - failed resubmitting read urb, error %d\n", __FUNCTION__, result);
 204         return;
 205 }
 206
 207 static int ipw_open(struct usb_serial_port *port, struct file *filp)
 208 {
 209         struct usb_device *dev = port->serial->dev;
 210         u8 buf_flow_static[16] = IPW_BYTES_FLOWINIT;
 211         u8 *buf_flow_init;
 212         int result;
 213
 214         dbg("%s", __FUNCTION__);
 215
 216         buf_flow_init = kmalloc(16, GFP_KERNEL);
 217         if (!buf_flow_init)
 218                 return -ENOMEM;
 219         memcpy(buf_flow_init, buf_flow_static, 16);
 220
 221         if (port->tty)
 222                 port->tty->low_latency = 1;
 223
 224         /* --1: Tell the modem to initialize (we think) From sniffs this is always the
 225          * first thing that gets sent to the modem during opening of the device */
 226         dbg("%s: Sending SIO_INIT (we guess)",__FUNCTION__);
 227         result = usb_control_msg(dev, usb_sndctrlpipe(dev,0),
 228                                  IPW_SIO_INIT,
 229                                  USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT,
 230                                  0,
 231                                  0, /* index */
 232                                  NULL,
 233                                  0,
 234                                  100000);
 235         if (result < 0)
 236                 dev_err(&port->dev, "Init of modem failed (error = %d)", result);
 237
 238         /* reset the bulk pipes */
 239         usb_clear_halt(dev, usb_rcvbulkpipe(dev, port->bulk_in_endpointAddress));
 240         usb_clear_halt(dev, usb_sndbulkpipe(dev, port->bulk_out_endpointAddress));
 241
 242         /*--2: Start reading from the device */
 243         dbg("%s: setting up bulk read callback",__FUNCTION__);
 244         usb_fill_bulk_urb(port->read_urb, dev,
 245                           usb_rcvbulkpipe(dev, port->bulk_in_endpointAddress),
 246                           port->bulk_in_buffer,
 247                           port->bulk_in_size,
 248                           ipw_read_bulk_callback, port);
 249         result = usb_submit_urb(port->read_urb, GFP_KERNEL);
 250         if (result < 0)
 251                 dbg("%s - usb_submit_urb(read bulk) failed with status %d", __FUNCTION__, result);
 252
 253         /*--3: Tell the modem to open the floodgates on the rx bulk channel */
 254         dbg("%s:asking modem for RxRead (RXBULK_ON)",__FUNCTION__);
 255         result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 256                                  IPW_SIO_RXCTL,
 257                                  USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT,
 258                                  IPW_RXBULK_ON,
 259                                  0, /* index */
 260                                  NULL,
 261                                  0,
 262                                  100000);
 263         if (result < 0)
 264                 dev_err(&port->dev, "Enabling bulk RxRead failed (error = %d)", result);
 265
 266         /*--4: setup the initial flowcontrol */
 267         dbg("%s:setting init flowcontrol (%s)",__FUNCTION__,buf_flow_init);
 268         result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 269                                  IPW_SIO_HANDFLOW,
 270                                  USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT,
 271                                  0,
 272                                  0,
 273                                  buf_flow_init,
 274                                  0x10,
 275                                  200000);
 276         if (result < 0)
 277                 dev_err(&port->dev, "initial flowcontrol failed (error = %d)", result);
 278
 279
 280         /*--5: raise the dtr */
 281         dbg("%s:raising dtr",__FUNCTION__);
 282         result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 283                                  IPW_SIO_SET_PIN,
 284                                  USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT,
 285                                  IPW_PIN_SETDTR,
 286                                  0,
 287                                  NULL,
 288                                  0,
 289                                  200000);
 290         if (result < 0)
 291                 dev_err(&port->dev, "setting dtr failed (error = %d)", result);
 292
 293         /*--6: raise the rts */
 294         dbg("%s:raising rts",__FUNCTION__);
 295         result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 296                                  IPW_SIO_SET_PIN,
 297                                  USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT,
 298                                  IPW_PIN_SETRTS,
 299                                  0,
 300                                  NULL,
 301                                  0,
 302                                  200000);
 303         if (result < 0)
 304                 dev_err(&port->dev, "setting dtr failed (error = %d)", result);
 305
 306         kfree(buf_flow_init);
 307         return 0;
 308 }
 309
 310 static void ipw_close(struct usb_serial_port *port, struct file * filp)
 311 {
 312         struct usb_device *dev = port->serial->dev;
 313         int result;
 314
 315         if (tty_hung_up_p(filp)) {
 316                 dbg("%s: tty_hung_up_p ...", __FUNCTION__);
 317                 return;
 318         }
 319
 320         /*--1: drop the dtr */
 321         dbg("%s:dropping dtr",__FUNCTION__);
 322         result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 323                                  IPW_SIO_SET_PIN,
 324                                  USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT,
 325                                  IPW_PIN_CLRDTR,
 326                                  0,
 327                                  NULL,
 328                                  0,
 329                                  200000);
 330         if (result < 0)
 331                 dev_err(&port->dev, "dropping dtr failed (error = %d)", result);
 332
 333         /*--2: drop the rts */
 334         dbg("%s:dropping rts",__FUNCTION__);
 335         result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 336                                  IPW_SIO_SET_PIN, USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT,
 337                                  IPW_PIN_CLRRTS,
 338                                  0,
 339                                  NULL,
 340                                  0,
 341                                  200000);
 342         if (result < 0)
 343                 dev_err(&port->dev, "dropping rts failed (error = %d)", result);
 344
 345
 346         /*--3: purge */
 347         dbg("%s:sending purge",__FUNCTION__);
 348         result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 349                                  IPW_SIO_PURGE, USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT,
 350                                  0x03,
 351                                  0,
 352                                  NULL,
 353                                  0,
 354                                  200000);
 355         if (result < 0)
 356                 dev_err(&port->dev, "purge failed (error = %d)", result);
 357
 358
 359         /* send RXBULK_off (tell modem to stop transmitting bulk data on rx chan) */
 360         result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 361                                  IPW_SIO_RXCTL,
 362                                  USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT,
 363                                  IPW_RXBULK_OFF,
 364                                  0, /* index */
 365                                  NULL,
 366                                  0,
 367                                  100000);
 368
 369         if (result < 0)
 370                 dev_err(&port->dev, "Disabling bulk RxRead failed (error = %d)", result);
 371
 372         /* shutdown any in-flight urbs that we know about */
 373         usb_kill_urb(port->read_urb);
 374         usb_kill_urb(port->write_urb);
 375 }
 376
 377 static void ipw_write_bulk_callback(struct urb *urb, struct pt_regs *regs)
 378 {
 379         struct usb_serial_port *port = urb->context;
 380
 381         dbg("%s", __FUNCTION__);
 382
 383         if (urb->status)
 384                 dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status);
 385
 386         schedule_work(&port->work);
 387 }
 388
 389 static int ipw_write(struct usb_serial_port *port, const unsigned char *buf, int count)
 390 {
 391         struct usb_device *dev = port->serial->dev;
 392         int ret;
 393
 394         dbg("%s: TOP: count=%d, in_interrupt=%ld", __FUNCTION__,
 395                 count, in_interrupt() );
 396
 397         if (count == 0) {
 398                 dbg("%s - write request of 0 bytes", __FUNCTION__);
 399                 return 0;
 400         }
 401
 402         spin_lock(&port->lock);
 403         if (port->write_urb_busy) {
 404                 spin_unlock(&port->lock);
 405                 dbg("%s - already writing", __FUNCTION__);
 406                 return 0;
 407         }
 408         port->write_urb_busy = 1;
 409         spin_unlock(&port->lock);
 410
 411         count = min(count, port->bulk_out_size);
 412         memcpy(port->bulk_out_buffer, buf, count);
 413
 414         dbg("%s count now:%d", __FUNCTION__, count);
 415
 416         usb_fill_bulk_urb(port->write_urb, dev,
 417                           usb_sndbulkpipe(dev, port->bulk_out_endpointAddress),
 418                           port->write_urb->transfer_buffer,
 419                           count,
 420                           ipw_write_bulk_callback,
 421                           port);
 422
 423         ret = usb_submit_urb(port->write_urb, GFP_ATOMIC);
 424         if (ret != 0) {
 425                 port->write_urb_busy = 0;
 426                 dbg("%s - usb_submit_urb(write bulk) failed with error = %d", __FUNCTION__, ret);
 427                 return ret;
 428         }
 429
 430         dbg("%s returning %d", __FUNCTION__, count);
 431         return count;
 432 }
 433
 434 static int ipw_probe(struct usb_serial_port *port)
 435 {
 436         return 0;
 437 }
 438
 439 static int ipw_disconnect(struct usb_serial_port *port)
 440 {
 441         usb_set_serial_port_data(port, NULL);
 442         return 0;
 443 }
 444
 445 static struct usb_serial_driver ipw_device = {
 446         .driver = {
 447                 .owner =        THIS_MODULE,
 448                 .name =         "ipw",
 449         },
 450         .description =          "IPWireless converter",
 451         .id_table =             usb_ipw_ids,
 452         .num_interrupt_in =     NUM_DONT_CARE,
 453         .num_bulk_in =          1,
 454         .num_bulk_out =         1,
 455         .num_ports =            1,
 456         .open =                 ipw_open,
 457         .close =                ipw_close,
 458         .port_probe =           ipw_probe,
 459         .port_remove =          ipw_disconnect,
 460         .write =                ipw_write,
 461         .write_bulk_callback =  ipw_write_bulk_callback,
 462         .read_bulk_callback =   ipw_read_bulk_callback,
 463 };
 464
 465
 466
 467 static int usb_ipw_init(void)
 468 {
 469         int retval;
 470
 471         retval = usb_serial_register(&ipw_device);
 472         if (retval)
 473                 return retval;
 474         retval = usb_register(&usb_ipw_driver);
 475         if (retval) {
 476                 usb_serial_deregister(&ipw_device);
 477                 return retval;
 478         }
 479         info(DRIVER_DESC " " DRIVER_VERSION);
 480         return 0;
 481 }
 482
 483 static void usb_ipw_exit(void)
 484 {
 485         usb_deregister(&usb_ipw_driver);
 486         usb_serial_deregister(&ipw_device);
 487 }
 488
 489 module_init(usb_ipw_init);
 490 module_exit(usb_ipw_exit);
 491
 492 /* Module information */
 493 MODULE_AUTHOR( DRIVER_AUTHOR );
 494 MODULE_DESCRIPTION( DRIVER_DESC );
 495 MODULE_LICENSE("GPL");
 496
 497 module_param(debug, bool, S_IRUGO | S_IWUSR);
 498 MODULE_PARM_DESC(debug, "Debug enabled or not");