drivers/usb/serial/omninet.c

   1 /*
   2  * USB ZyXEL omni.net LCD PLUS driver
   3  *
   4  *      This program is free software; you can redistribute it and/or modify
   5  *      it under the terms of the GNU General Public License as published by
   6  *      the Free Software Foundation; either version 2 of the License, or
   7  *      (at your option) any later version.
   8  *
   9  * See Documentation/usb/usb-serial.txt for more information on using this driver
  10  *
  11  * Please report both successes and troubles to the author at omninet@kroah.com
  12  *
  13  * (05/30/2001) gkh
  14  *      switched from using spinlock to a semaphore, which fixes lots of problems.
  15  *
  16  * (04/08/2001) gb
  17  *      Identify version on module load.
  18  *
  19  * (11/01/2000) Adam J. Richter
  20  *      usb_device_id table support
  21  *
  22  * (10/05/2000) gkh
  23  *      Fixed bug with urb->dev not being set properly, now that the usb
  24  *      core needs it.
  25  *
  26  * (08/28/2000) gkh
  27  *      Added locks for SMP safeness.
  28  *      Fixed MOD_INC and MOD_DEC logic and the ability to open a port more
  29  *      than once.
  30  *      Fixed potential race in omninet_write_bulk_callback
  31  *
  32  * (07/19/2000) gkh
  33  *      Added module_init and module_exit functions to handle the fact that this
  34  *      driver is a loadable module now.
  35  *
  36  */
  37
  38 #include <linux/config.h>
  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_driver.h>
  45 #include <linux/tty_flip.h>
  46 #include <linux/module.h>
  47 #include <linux/spinlock.h>
  48 #include <asm/uaccess.h>
  49 #include <linux/usb.h>
  50 #include "usb-serial.h"
  51
  52 static int debug;
  53
  54 /*
  55  * Version Information
  56  */
  57 #define DRIVER_VERSION "v1.1"
  58 #define DRIVER_AUTHOR "Alessandro Zummo"
  59 #define DRIVER_DESC "USB ZyXEL omni.net LCD PLUS Driver"
  60
  61 #define ZYXEL_VENDOR_ID         0x0586
  62 #define ZYXEL_OMNINET_ID        0x1000
  63 #define BT_IGNITIONPRO_ID       0x2000  /* This one seems to be a re-branded ZyXEL device */
  64
  65 /* function prototypes */
  66 static int  omninet_open                (struct usb_serial_port *port, struct file *filp);
  67 static void omninet_close               (struct usb_serial_port *port, struct file *filp);
  68 static void omninet_read_bulk_callback  (struct urb *urb, struct pt_regs *regs);
  69 static void omninet_write_bulk_callback (struct urb *urb, struct pt_regs *regs);
  70 static int  omninet_write               (struct usb_serial_port *port, int from_user, const unsigned char *buf, int count);
  71 static int  omninet_write_room          (struct usb_serial_port *port);
  72 static void omninet_shutdown            (struct usb_serial *serial);
  73
  74 static struct usb_device_id id_table [] = {
  75         { USB_DEVICE(ZYXEL_VENDOR_ID, ZYXEL_OMNINET_ID) },
  76         { USB_DEVICE(ZYXEL_VENDOR_ID, BT_IGNITIONPRO_ID) },
  77         { }                                             /* Terminating entry */
  78 };
  79
  80 MODULE_DEVICE_TABLE (usb, id_table);
  81
  82 static struct usb_driver omninet_driver = {
  83         .owner =        THIS_MODULE,
  84         .name =         "omninet",
  85         .probe =        usb_serial_probe,
  86         .disconnect =   usb_serial_disconnect,
  87         .id_table =     id_table,
  88 };
  89
  90
  91 static struct usb_serial_device_type zyxel_omninet_device = {
  92         .owner =                THIS_MODULE,
  93         .name =                 "ZyXEL - omni.net lcd plus usb",
  94         .short_name =           "omninet",
  95         .id_table =             id_table,
  96         .num_interrupt_in =     1,
  97         .num_bulk_in =          1,
  98         .num_bulk_out =         2,
  99         .num_ports =            1,
 100         .open =                 omninet_open,
 101         .close =                omninet_close,
 102         .write =                omninet_write,
 103         .write_room =           omninet_write_room,
 104         .read_bulk_callback =   omninet_read_bulk_callback,
 105         .write_bulk_callback =  omninet_write_bulk_callback,
 106         .shutdown =             omninet_shutdown,
 107 };
 108
 109
 110 /* The protocol.
 111  *
 112  * The omni.net always exchange 64 bytes of data with the host. The first
 113  * four bytes are the control header, you can see it in the above structure.
 114  *
 115  * oh_seq is a sequence number. Don't know if/how it's used.
 116  * oh_len is the length of the data bytes in the packet.
 117  * oh_xxx Bit-mapped, related to handshaking and status info.
 118  *      I normally set it to 0x03 in trasmitted frames.
 119  *      7: Active when the TA is in a CONNECTed state.
 120  *      6: unknown
 121  *      5: handshaking, unknown
 122  *      4: handshaking, unknown
 123  *      3: unknown, usually 0
 124  *      2: unknown, usually 0
 125  *      1: handshaking, unknown, usually set to 1 in trasmitted frames
 126  *      0: handshaking, unknown, usually set to 1 in trasmitted frames
 127  * oh_pad Probably a pad byte.
 128  *
 129  * After the header you will find data bytes if oh_len was greater than zero.
 130  *
 131  */
 132
 133 struct omninet_header
 134 {
 135         __u8    oh_seq;
 136         __u8    oh_len;
 137         __u8    oh_xxx;
 138         __u8    oh_pad;
 139 };
 140
 141 struct omninet_data
 142 {
 143         __u8    od_outseq;      // Sequence number for bulk_out URBs
 144 };
 145
 146 static int omninet_open (struct usb_serial_port *port, struct file *filp)
 147 {
 148         struct usb_serial       *serial = port->serial;
 149         struct usb_serial_port  *wport;
 150         struct omninet_data     *od;
 151         int                     result = 0;
 152
 153         dbg("%s - port %d", __FUNCTION__, port->number);
 154
 155         od = kmalloc( sizeof(struct omninet_data), GFP_KERNEL );
 156         if( !od ) {
 157                 err("%s- kmalloc(%Zd) failed.", __FUNCTION__, sizeof(struct omninet_data));
 158                 return -ENOMEM;
 159         }
 160
 161         usb_set_serial_port_data(port, od);
 162         wport = serial->port[1];
 163         wport->tty = port->tty;
 164
 165         /* Start reading from the device */
 166         usb_fill_bulk_urb(port->read_urb, serial->dev,
 167                       usb_rcvbulkpipe(serial->dev, port->bulk_in_endpointAddress),
 168                       port->read_urb->transfer_buffer, port->read_urb->transfer_buffer_length,
 169                       omninet_read_bulk_callback, port);
 170         result = usb_submit_urb(port->read_urb, GFP_KERNEL);
 171         if (result)
 172                 err("%s - failed submitting read urb, error %d", __FUNCTION__, result);
 173
 174         return result;
 175 }
 176
 177 static void omninet_close (struct usb_serial_port *port, struct file * filp)
 178 {
 179         struct usb_serial       *serial = port->serial;
 180         struct usb_serial_port  *wport;
 181         struct omninet_data     *od;
 182
 183         dbg("%s - port %d", __FUNCTION__, port->number);
 184
 185         wport = serial->port[1];
 186         usb_unlink_urb(wport->write_urb);
 187         usb_unlink_urb(port->read_urb);
 188
 189         od = usb_get_serial_port_data(port);
 190         if (od)
 191                 kfree(od);
 192 }
 193
 194
 195 #define OMNINET_DATAOFFSET      0x04
 196 #define OMNINET_HEADERLEN       sizeof(struct omninet_header)
 197 #define OMNINET_BULKOUTSIZE     (64 - OMNINET_HEADERLEN)
 198
 199 static void omninet_read_bulk_callback (struct urb *urb, struct pt_regs *regs)
 200 {
 201         struct usb_serial_port  *port   = (struct usb_serial_port *)urb->context;
 202         unsigned char           *data   = urb->transfer_buffer;
 203         struct omninet_header   *header = (struct omninet_header *) &data[0];
 204
 205         int i;
 206         int result;
 207
 208 //      dbg("omninet_read_bulk_callback");
 209
 210         if (urb->status) {
 211                 dbg("%s - nonzero read bulk status received: %d", __FUNCTION__, urb->status);
 212                 return;
 213         }
 214
 215         if ((debug) && (header->oh_xxx != 0x30)) {
 216                 if (urb->actual_length) {
 217                         printk (KERN_DEBUG __FILE__ ": omninet_read %d: ", header->oh_len);
 218                         for (i = 0; i < (header->oh_len + OMNINET_HEADERLEN); i++) {
 219                                 printk ("%.2x ", data[i]);
 220                         }
 221                         printk ("\n");
 222                 }
 223         }
 224
 225         if (urb->actual_length && header->oh_len) {
 226                 for (i = 0; i < header->oh_len; i++) {
 227                          tty_insert_flip_char(port->tty, data[OMNINET_DATAOFFSET + i], 0);
 228                 }
 229                 tty_flip_buffer_push(port->tty);
 230         }
 231
 232         /* Continue trying to always read  */
 233         usb_fill_bulk_urb(urb, port->serial->dev,
 234                       usb_rcvbulkpipe(port->serial->dev, port->bulk_in_endpointAddress),
 235                       urb->transfer_buffer, urb->transfer_buffer_length,
 236                       omninet_read_bulk_callback, port);
 237         result = usb_submit_urb(urb, GFP_ATOMIC);
 238         if (result)
 239                 err("%s - failed resubmitting read urb, error %d", __FUNCTION__, result);
 240
 241         return;
 242 }
 243
 244 static int omninet_write (struct usb_serial_port *port, int from_user, const unsigned char *buf, int count)
 245 {
 246         struct usb_serial       *serial = port->serial;
 247         struct usb_serial_port  *wport  = serial->port[1];
 248
 249         struct omninet_data     *od     = usb_get_serial_port_data(port);
 250         struct omninet_header   *header = (struct omninet_header *) wport->write_urb->transfer_buffer;
 251
 252         int                     result;
 253
 254 //      dbg("omninet_write port %d", port->number);
 255
 256         if (count == 0) {
 257                 dbg("%s - write request of 0 bytes", __FUNCTION__);
 258                 return (0);
 259         }
 260         if (wport->write_urb->status == -EINPROGRESS) {
 261                 dbg("%s - already writing", __FUNCTION__);
 262                 return (0);
 263         }
 264
 265         count = (count > OMNINET_BULKOUTSIZE) ? OMNINET_BULKOUTSIZE : count;
 266
 267         if (from_user) {
 268                 if (copy_from_user(wport->write_urb->transfer_buffer + OMNINET_DATAOFFSET, buf, count) != 0) {
 269                         result = -EFAULT;
 270                         goto exit;
 271                 }
 272         }
 273         else {
 274                 memcpy (wport->write_urb->transfer_buffer + OMNINET_DATAOFFSET, buf, count);
 275         }
 276
 277         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count, wport->write_urb->transfer_buffer);
 278
 279         header->oh_seq  = od->od_outseq++;
 280         header->oh_len  = count;
 281         header->oh_xxx  = 0x03;
 282         header->oh_pad  = 0x00;
 283
 284         /* send the data out the bulk port, always 64 bytes */
 285         wport->write_urb->transfer_buffer_length = 64;
 286
 287         wport->write_urb->dev = serial->dev;
 288         result = usb_submit_urb(wport->write_urb, GFP_ATOMIC);
 289         if (result)
 290                 err("%s - failed submitting write urb, error %d", __FUNCTION__, result);
 291         else
 292                 result = count;
 293
 294 exit:
 295         return result;
 296 }
 297
 298
 299 static int omninet_write_room (struct usb_serial_port *port)
 300 {
 301         struct usb_serial       *serial = port->serial;
 302         struct usb_serial_port  *wport  = serial->port[1];
 303
 304         int room = 0; // Default: no room
 305
 306         if (wport->write_urb->status != -EINPROGRESS)
 307                 room = wport->bulk_out_size - OMNINET_HEADERLEN;
 308
 309 //      dbg("omninet_write_room returns %d", room);
 310
 311         return (room);
 312 }
 313
 314 static void omninet_write_bulk_callback (struct urb *urb, struct pt_regs *regs)
 315 {
 316 /*      struct omninet_header   *header = (struct omninet_header  *) urb->transfer_buffer; */
 317         struct usb_serial_port  *port   = (struct usb_serial_port *) urb->context;
 318
 319 //      dbg("omninet_write_bulk_callback, port %0x\n", port);
 320
 321         if (urb->status) {
 322                 dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status);
 323                 return;
 324         }
 325
 326         schedule_work(&port->work);
 327
 328 //      dbg("omninet_write_bulk_callback, tty %0x\n", tty);
 329 }
 330
 331
 332 static void omninet_shutdown (struct usb_serial *serial)
 333 {
 334         dbg ("%s", __FUNCTION__);
 335 }
 336
 337
 338 static int __init omninet_init (void)
 339 {
 340         int retval;
 341         retval = usb_serial_register(&zyxel_omninet_device);
 342         if (retval)
 343                 goto failed_usb_serial_register;
 344         retval = usb_register(&omninet_driver);
 345         if (retval)
 346                 goto failed_usb_register;
 347         info(DRIVER_VERSION ":" DRIVER_DESC);
 348         return 0;
 349 failed_usb_register:
 350         usb_serial_deregister(&zyxel_omninet_device);
 351 failed_usb_serial_register:
 352         return retval;
 353 }
 354
 355
 356 static void __exit omninet_exit (void)
 357 {
 358         usb_deregister (&omninet_driver);
 359         usb_serial_deregister (&zyxel_omninet_device);
 360 }
 361
 362
 363 module_init(omninet_init);
 364 module_exit(omninet_exit);
 365
 366 MODULE_AUTHOR( DRIVER_AUTHOR );
 367 MODULE_DESCRIPTION( DRIVER_DESC );
 368 MODULE_LICENSE("GPL");
 369
 370 module_param(debug, bool, S_IRUGO | S_IWUSR);
 371 MODULE_PARM_DESC(debug, "Debug enabled or not");