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