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 #include <linux/kernel.h>
  40 #include <linux/errno.h>
  41 #include <linux/init.h>
  42 #include <linux/slab.h>
  43 #include <linux/tty.h>
  44 #include <linux/tty_flip.h>
  45 #include <linux/module.h>
  46 #include <linux/spinlock.h>
  47 #include <linux/usb.h>
  48 #include <linux/usb/serial.h>
  49 #include <linux/uaccess.h>
  50
  51 /*
  52  * Version Information
  53  */
  54 #define DRIVER_VERSION  "v0.4"
  55 #define DRIVER_AUTHOR   "Roelf Diedericks"
  56 #define DRIVER_DESC     "IPWireless tty driver"
  57
  58 #define IPW_TTY_MAJOR   240     /* real device node major id, experimental range */
  59 #define IPW_TTY_MINORS  256     /* we support 256 devices, dunno why, it'd be insane :) */
  60
  61 #define USB_IPW_MAGIC   0x6d02  /* magic number for ipw struct */
  62
  63
  64 /* Message sizes */
  65 #define EVENT_BUFFER_SIZE       0xFF
  66 #define CHAR2INT16(c1, c0)      (((u32)((c1) & 0xff) << 8) + (u32)((c0) & 0xff))
  67
  68 /* vendor/product pairs that are known work with this driver*/
  69 #define IPW_VID         0x0bc3
  70 #define IPW_PID         0x0001
  71
  72
  73 /* Vendor commands: */
  74
  75 /* baud rates */
  76 enum {
  77         ipw_sio_b256000 = 0x000e,
  78         ipw_sio_b128000 = 0x001d,
  79         ipw_sio_b115200 = 0x0020,
  80         ipw_sio_b57600  = 0x0040,
  81         ipw_sio_b56000  = 0x0042,
  82         ipw_sio_b38400  = 0x0060,
  83         ipw_sio_b19200  = 0x00c0,
  84         ipw_sio_b14400  = 0x0100,
  85         ipw_sio_b9600   = 0x0180,
  86         ipw_sio_b4800   = 0x0300,
  87         ipw_sio_b2400   = 0x0600,
  88         ipw_sio_b1200   = 0x0c00,
  89         ipw_sio_b600    = 0x1800
  90 };
  91
  92 /* data bits */
  93 #define ipw_dtb_7               0x700
  94 #define ipw_dtb_8               0x810   /* ok so the define is misleading, I know, but forces 8,n,1 */
  95                                         /* I mean, is there a point to any other setting these days? :) */
  96
  97 /* usb control request types : */
  98 #define IPW_SIO_RXCTL           0x00    /* control bulk rx channel transmissions, value=1/0 (on/off) */
  99 #define IPW_SIO_SET_BAUD        0x01    /* set baud, value=requested ipw_sio_bxxxx */
 100 #define IPW_SIO_SET_LINE        0x03    /* set databits, parity. value=ipw_dtb_x */
 101 #define IPW_SIO_SET_PIN         0x03    /* set/clear dtr/rts value=ipw_pin_xxx */
 102 #define IPW_SIO_POLL            0x08    /* get serial port status byte, call with value=0 */
 103 #define IPW_SIO_INIT            0x11    /* initializes ? value=0 (appears as first thing todo on open) */
 104 #define IPW_SIO_PURGE           0x12    /* purge all transmissions?, call with value=numchar_to_purge */
 105 #define IPW_SIO_HANDFLOW        0x13    /* set xon/xoff limits value=0, and a buffer of 0x10 bytes */
 106 #define IPW_SIO_SETCHARS        0x13    /* set the flowcontrol special chars, value=0, buf=6 bytes, */
 107                                         /* last 2 bytes contain flowcontrol chars e.g. 00 00 00 00 11 13 */
 108
 109 /* values used for request IPW_SIO_SET_PIN */
 110 #define IPW_PIN_SETDTR          0x101
 111 #define IPW_PIN_SETRTS          0x202
 112 #define IPW_PIN_CLRDTR          0x100
 113 #define IPW_PIN_CLRRTS          0x200 /* unconfirmed */
 114
 115 /* values used for request IPW_SIO_RXCTL */
 116 #define IPW_RXBULK_ON           1
 117 #define IPW_RXBULK_OFF          0
 118
 119 /* various 16 byte hardcoded transferbuffers used by flow control */
 120 #define IPW_BYTES_FLOWINIT      { 0x01, 0, 0, 0, 0x40, 0, 0, 0, \
 121                                         0, 0, 0, 0, 0, 0, 0, 0 }
 122
 123 /* Interpretation of modem status lines */
 124 /* These need sorting out by individually connecting pins and checking
 125  * results. FIXME!
 126  * When data is being sent we see 0x30 in the lower byte; this must
 127  * contain DSR and CTS ...
 128  */
 129 #define IPW_DSR                 ((1<<4) | (1<<5))
 130 #define IPW_CTS                 ((1<<5) | (1<<4))
 131
 132 #define IPW_WANTS_TO_SEND       0x30
 133
 134 static const struct usb_device_id usb_ipw_ids[] = {
 135         { USB_DEVICE(IPW_VID, IPW_PID) },
 136         { },
 137 };
 138
 139 MODULE_DEVICE_TABLE(usb, usb_ipw_ids);
 140
 141 static struct usb_driver usb_ipw_driver = {
 142         .name =         "ipwtty",
 143         .probe =        usb_serial_probe,
 144         .disconnect =   usb_serial_disconnect,
 145         .id_table =     usb_ipw_ids,
 146         .no_dynamic_id =        1,
 147 };
 148
 149 static int debug;
 150
 151 static int ipw_open(struct tty_struct *tty, struct usb_serial_port *port)
 152 {
 153         struct usb_device *dev = port->serial->dev;
 154         u8 buf_flow_static[16] = IPW_BYTES_FLOWINIT;
 155         u8 *buf_flow_init;
 156         int result;
 157
 158         dbg("%s", __func__);
 159
 160         buf_flow_init = kmemdup(buf_flow_static, 16, GFP_KERNEL);
 161         if (!buf_flow_init)
 162                 return -ENOMEM;
 163
 164         /* --1: Tell the modem to initialize (we think) From sniffs this is
 165          *      always the first thing that gets sent to the modem during
 166          *      opening of the device */
 167         dbg("%s: Sending SIO_INIT (we guess)", __func__);
 168         result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 169                          IPW_SIO_INIT,
 170                          USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT,
 171                          0,
 172                          0, /* index */
 173                          NULL,
 174                          0,
 175                          100000);
 176         if (result < 0)
 177                 dev_err(&port->dev,
 178                         "Init of modem failed (error = %d)\n", result);
 179
 180         /* reset the bulk pipes */
 181         usb_clear_halt(dev,
 182                         usb_rcvbulkpipe(dev, port->bulk_in_endpointAddress));
 183         usb_clear_halt(dev,
 184                         usb_sndbulkpipe(dev, port->bulk_out_endpointAddress));
 185
 186         /*--2: Start reading from the device */
 187         dbg("%s: setting up bulk read callback", __func__);
 188         usb_serial_generic_open(tty, port);
 189
 190         /*--3: Tell the modem to open the floodgates on the rx bulk channel */
 191         dbg("%s:asking modem for RxRead (RXBULK_ON)", __func__);
 192         result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 193                          IPW_SIO_RXCTL,
 194                          USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT,
 195                          IPW_RXBULK_ON,
 196                          0, /* index */
 197                          NULL,
 198                          0,
 199                          100000);
 200         if (result < 0)
 201                 dev_err(&port->dev,
 202                         "Enabling bulk RxRead failed (error = %d)\n", result);
 203
 204         /*--4: setup the initial flowcontrol */
 205         dbg("%s:setting init flowcontrol (%s)", __func__, buf_flow_init);
 206         result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 207                          IPW_SIO_HANDFLOW,
 208                          USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT,
 209                          0,
 210                          0,
 211                          buf_flow_init,
 212                          0x10,
 213                          200000);
 214         if (result < 0)
 215                 dev_err(&port->dev,
 216                         "initial flowcontrol failed (error = %d)\n", result);
 217
 218         kfree(buf_flow_init);
 219         return 0;
 220 }
 221
 222 static void ipw_dtr_rts(struct usb_serial_port *port, int on)
 223 {
 224         struct usb_device *dev = port->serial->dev;
 225         int result;
 226
 227         dbg("%s: on = %d", __func__, on);
 228
 229         result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 230                          IPW_SIO_SET_PIN,
 231                          USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT,
 232                          on ? IPW_PIN_SETDTR : IPW_PIN_CLRDTR,
 233                          0,
 234                          NULL,
 235                          0,
 236                          200000);
 237         if (result < 0)
 238                 dev_err(&port->dev, "setting dtr failed (error = %d)\n",
 239                                                                 result);
 240
 241         result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 242                          IPW_SIO_SET_PIN, USB_TYPE_VENDOR |
 243                                         USB_RECIP_INTERFACE | USB_DIR_OUT,
 244                          on ? IPW_PIN_SETRTS : IPW_PIN_CLRRTS,
 245                          0,
 246                          NULL,
 247                          0,
 248                          200000);
 249         if (result < 0)
 250                 dev_err(&port->dev, "setting rts failed (error = %d)\n",
 251                                                                 result);
 252 }
 253
 254 static void ipw_close(struct usb_serial_port *port)
 255 {
 256         struct usb_device *dev = port->serial->dev;
 257         int result;
 258
 259         /*--3: purge */
 260         dbg("%s:sending purge", __func__);
 261         result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 262                          IPW_SIO_PURGE, USB_TYPE_VENDOR |
 263                                         USB_RECIP_INTERFACE | USB_DIR_OUT,
 264                          0x03,
 265                          0,
 266                          NULL,
 267                          0,
 268                          200000);
 269         if (result < 0)
 270                 dev_err(&port->dev, "purge failed (error = %d)\n", result);
 271
 272
 273         /* send RXBULK_off (tell modem to stop transmitting bulk data on
 274            rx chan) */
 275         result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 276                          IPW_SIO_RXCTL,
 277                          USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_OUT,
 278                          IPW_RXBULK_OFF,
 279                          0, /* index */
 280                          NULL,
 281                          0,
 282                          100000);
 283
 284         if (result < 0)
 285                 dev_err(&port->dev,
 286                         "Disabling bulk RxRead failed (error = %d)\n", result);
 287
 288         usb_serial_generic_close(port);
 289 }
 290
 291 static struct usb_serial_driver ipw_device = {
 292         .driver = {
 293                 .owner =        THIS_MODULE,
 294                 .name =         "ipw",
 295         },
 296         .description =          "IPWireless converter",
 297         .usb_driver =           &usb_ipw_driver,
 298         .id_table =             usb_ipw_ids,
 299         .num_ports =            1,
 300         .open =                 ipw_open,
 301         .close =                ipw_close,
 302         .dtr_rts =              ipw_dtr_rts,
 303 };
 304
 305
 306
 307 static int __init usb_ipw_init(void)
 308 {
 309         int retval;
 310
 311         retval = usb_serial_register(&ipw_device);
 312         if (retval)
 313                 return retval;
 314         retval = usb_register(&usb_ipw_driver);
 315         if (retval) {
 316                 usb_serial_deregister(&ipw_device);
 317                 return retval;
 318         }
 319         printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
 320                DRIVER_DESC "\n");
 321         return 0;
 322 }
 323
 324 static void __exit usb_ipw_exit(void)
 325 {
 326         usb_deregister(&usb_ipw_driver);
 327         usb_serial_deregister(&ipw_device);
 328 }
 329
 330 module_init(usb_ipw_init);
 331 module_exit(usb_ipw_exit);
 332
 333 /* Module information */
 334 MODULE_AUTHOR(DRIVER_AUTHOR);
 335 MODULE_DESCRIPTION(DRIVER_DESC);
 336 MODULE_LICENSE("GPL");
 337
 338 module_param(debug, bool, S_IRUGO | S_IWUSR);
 339 MODULE_PARM_DESC(debug, "Debug enabled or not");