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, 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         .name =         "omninet",
  84         .probe =        usb_serial_probe,
  85         .disconnect =   usb_serial_disconnect,
  86         .id_table =     id_table,
  87         .no_dynamic_id =        1,
  88 };
  89
  90
  91 static struct usb_serial_driver zyxel_omninet_device = {
  92         .driver = {
  93                 .owner =        THIS_MODULE,
  94                 .name =         "omninet",
  95         },
  96         .description =          "ZyXEL - omni.net lcd plus usb",
  97         .id_table =             id_table,
  98         .num_interrupt_in =     1,
  99         .num_bulk_in =          1,
 100         .num_bulk_out =         2,
 101         .num_ports =            1,
 102         .open =                 omninet_open,
 103         .close =                omninet_close,
 104         .write =                omninet_write,
 105         .write_room =           omninet_write_room,
 106         .read_bulk_callback =   omninet_read_bulk_callback,
 107         .write_bulk_callback =  omninet_write_bulk_callback,
 108         .shutdown =             omninet_shutdown,
 109 };
 110
 111
 112 /* The protocol.
 113  *
 114  * The omni.net always exchange 64 bytes of data with the host. The first
 115  * four bytes are the control header, you can see it in the above structure.
 116  *
 117  * oh_seq is a sequence number. Don't know if/how it's used.
 118  * oh_len is the length of the data bytes in the packet.
 119  * oh_xxx Bit-mapped, related to handshaking and status info.
 120  *      I normally set it to 0x03 in trasmitted frames.
 121  *      7: Active when the TA is in a CONNECTed state.
 122  *      6: unknown
 123  *      5: handshaking, unknown
 124  *      4: handshaking, unknown
 125  *      3: unknown, usually 0
 126  *      2: unknown, usually 0
 127  *      1: handshaking, unknown, usually set to 1 in trasmitted frames
 128  *      0: handshaking, unknown, usually set to 1 in trasmitted frames
 129  * oh_pad Probably a pad byte.
 130  *
 131  * After the header you will find data bytes if oh_len was greater than zero.
 132  *
 133  */
 134
 135 struct omninet_header
 136 {
 137         __u8    oh_seq;
 138         __u8    oh_len;
 139         __u8    oh_xxx;
 140         __u8    oh_pad;
 141 };
 142
 143 struct omninet_data
 144 {
 145         __u8    od_outseq;      // Sequence number for bulk_out URBs
 146 };
 147
 148 static int omninet_open (struct usb_serial_port *port, struct file *filp)
 149 {
 150         struct usb_serial       *serial = port->serial;
 151         struct usb_serial_port  *wport;
 152         struct omninet_data     *od;
 153         int                     result = 0;
 154
 155         dbg("%s - port %d", __FUNCTION__, port->number);
 156
 157         od = kmalloc( sizeof(struct omninet_data), GFP_KERNEL );
 158         if( !od ) {
 159                 err("%s- kmalloc(%Zd) failed.", __FUNCTION__, sizeof(struct omninet_data));
 160                 return -ENOMEM;
 161         }
 162
 163         usb_set_serial_port_data(port, od);
 164         wport = serial->port[1];
 165         wport->tty = port->tty;
 166
 167         /* Start reading from the device */
 168         usb_fill_bulk_urb(port->read_urb, serial->dev,
 169                       usb_rcvbulkpipe(serial->dev, port->bulk_in_endpointAddress),
 170                       port->read_urb->transfer_buffer, port->read_urb->transfer_buffer_length,
 171                       omninet_read_bulk_callback, port);
 172         result = usb_submit_urb(port->read_urb, GFP_KERNEL);
 173         if (result)
 174                 err("%s - failed submitting read urb, error %d", __FUNCTION__, result);
 175
 176         return result;
 177 }
 178
 179 static void omninet_close (struct usb_serial_port *port, struct file * filp)
 180 {
 181         struct usb_serial       *serial = port->serial;
 182         struct usb_serial_port  *wport;
 183
 184         dbg("%s - port %d", __FUNCTION__, port->number);
 185
 186         wport = serial->port[1];
 187         usb_kill_urb(wport->write_urb);
 188         usb_kill_urb(port->read_urb);
 189
 190         kfree(usb_get_serial_port_data(port));
 191 }
 192
 193
 194 #define OMNINET_DATAOFFSET      0x04
 195 #define OMNINET_HEADERLEN       sizeof(struct omninet_header)
 196 #define OMNINET_BULKOUTSIZE     (64 - OMNINET_HEADERLEN)
 197
 198 static void omninet_read_bulk_callback (struct urb *urb, struct pt_regs *regs)
 199 {
 200         struct usb_serial_port  *port   = (struct usb_serial_port *)urb->context;
 201         unsigned char           *data   = urb->transfer_buffer;
 202         struct omninet_header   *header = (struct omninet_header *) &data[0];
 203
 204         int i;
 205         int result;
 206
 207         dbg("%s - port %d", __FUNCTION__, port->number);
 208
 209         if (urb->status) {
 210                 dbg("%s - nonzero read bulk status received: %d", __FUNCTION__, urb->status);
 211                 return;
 212         }
 213
 214         if ((debug) && (header->oh_xxx != 0x30)) {
 215                 if (urb->actual_length) {
 216                         printk (KERN_DEBUG __FILE__ ": omninet_read %d: ", header->oh_len);
 217                         for (i = 0; i < (header->oh_len + OMNINET_HEADERLEN); i++) {
 218                                 printk ("%.2x ", data[i]);
 219                         }
 220                         printk ("\n");
 221                 }
 222         }
 223
 224         if (urb->actual_length && header->oh_len) {
 225                 for (i = 0; i < header->oh_len; i++) {
 226                          tty_insert_flip_char(port->tty, data[OMNINET_DATAOFFSET + i], 0);
 227                 }
 228                 tty_flip_buffer_push(port->tty);
 229         }
 230
 231         /* Continue trying to always read  */
 232         usb_fill_bulk_urb(urb, port->serial->dev,
 233                       usb_rcvbulkpipe(port->serial->dev, port->bulk_in_endpointAddress),
 234                       urb->transfer_buffer, urb->transfer_buffer_length,
 235                       omninet_read_bulk_callback, port);
 236         result = usb_submit_urb(urb, GFP_ATOMIC);
 237         if (result)
 238                 err("%s - failed resubmitting read urb, error %d", __FUNCTION__, result);
 239
 240         return;
 241 }
 242
 243 static int omninet_write (struct usb_serial_port *port, const unsigned char *buf, int count)
 244 {
 245         struct usb_serial       *serial = port->serial;
 246         struct usb_serial_port  *wport  = serial->port[1];
 247
 248         struct omninet_data     *od     = usb_get_serial_port_data(port);
 249         struct omninet_header   *header = (struct omninet_header *) wport->write_urb->transfer_buffer;
 250
 251         int                     result;
 252
 253         dbg("%s - port %d", __FUNCTION__, port->number);
 254
 255         if (count == 0) {
 256                 dbg("%s - write request of 0 bytes", __FUNCTION__);
 257                 return (0);
 258         }
 259
 260         spin_lock(&wport->lock);
 261         if (wport->write_urb_busy) {
 262                 spin_unlock(&wport->lock);
 263                 dbg("%s - already writing", __FUNCTION__);
 264                 return 0;
 265         }
 266         wport->write_urb_busy = 1;
 267         spin_unlock(&wport->lock);
 268
 269         count = (count > OMNINET_BULKOUTSIZE) ? OMNINET_BULKOUTSIZE : count;
 270
 271         memcpy (wport->write_urb->transfer_buffer + OMNINET_DATAOFFSET, buf, count);
 272
 273         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, count, wport->write_urb->transfer_buffer);
 274
 275         header->oh_seq  = od->od_outseq++;
 276         header->oh_len  = count;
 277         header->oh_xxx  = 0x03;
 278         header->oh_pad  = 0x00;
 279
 280         /* send the data out the bulk port, always 64 bytes */
 281         wport->write_urb->transfer_buffer_length = 64;
 282
 283         wport->write_urb->dev = serial->dev;
 284         result = usb_submit_urb(wport->write_urb, GFP_ATOMIC);
 285         if (result) {
 286                 wport->write_urb_busy = 0;
 287                 err("%s - failed submitting write urb, error %d", __FUNCTION__, result);
 288         } else
 289                 result = count;
 290
 291         return result;
 292 }
 293
 294
 295 static int omninet_write_room (struct usb_serial_port *port)
 296 {
 297         struct usb_serial       *serial = port->serial;
 298         struct usb_serial_port  *wport  = serial->port[1];
 299
 300         int room = 0; // Default: no room
 301
 302         if (wport->write_urb_busy)
 303                 room = wport->bulk_out_size - OMNINET_HEADERLEN;
 304
 305         dbg("%s - returns %d", __FUNCTION__, room);
 306
 307         return (room);
 308 }
 309
 310 static void omninet_write_bulk_callback (struct urb *urb, struct pt_regs *regs)
 311 {
 312 /*      struct omninet_header   *header = (struct omninet_header  *) urb->transfer_buffer; */
 313         struct usb_serial_port  *port   = (struct usb_serial_port *) urb->context;
 314
 315         dbg("%s - port %0x\n", __FUNCTION__, port->number);
 316
 317         port->write_urb_busy = 0;
 318         if (urb->status) {
 319                 dbg("%s - nonzero write bulk status received: %d", __FUNCTION__, urb->status);
 320                 return;
 321         }
 322
 323         usb_serial_port_softint(port);
 324 }
 325
 326
 327 static void omninet_shutdown (struct usb_serial *serial)
 328 {
 329         dbg ("%s", __FUNCTION__);
 330 }
 331
 332
 333 static int __init omninet_init (void)
 334 {
 335         int retval;
 336         retval = usb_serial_register(&zyxel_omninet_device);
 337         if (retval)
 338                 goto failed_usb_serial_register;
 339         retval = usb_register(&omninet_driver);
 340         if (retval)
 341                 goto failed_usb_register;
 342         info(DRIVER_VERSION ":" DRIVER_DESC);
 343         return 0;
 344 failed_usb_register:
 345         usb_serial_deregister(&zyxel_omninet_device);
 346 failed_usb_serial_register:
 347         return retval;
 348 }
 349
 350
 351 static void __exit omninet_exit (void)
 352 {
 353         usb_deregister (&omninet_driver);
 354         usb_serial_deregister (&zyxel_omninet_device);
 355 }
 356
 357
 358 module_init(omninet_init);
 359 module_exit(omninet_exit);
 360
 361 MODULE_AUTHOR( DRIVER_AUTHOR );
 362 MODULE_DESCRIPTION( DRIVER_DESC );
 363 MODULE_LICENSE("GPL");
 364
 365 module_param(debug, bool, S_IRUGO | S_IWUSR);
 366 MODULE_PARM_DESC(debug, "Debug enabled or not");