drivers/usb/input/keyspan_remote.c

   1 /*
   2  * keyspan_remote: USB driver for the Keyspan DMR
   3  *
   4  * Copyright (C) 2005 Zymeta Corporation - Michael Downey (downey@zymeta.com)
   5  *
   6  *      This program is free software; you can redistribute it and/or
   7  *      modify it under the terms of the GNU General Public License as
   8  *      published by the Free Software Foundation, version 2.
   9  *
  10  * This driver has been put together with the support of Innosys, Inc.
  11  * and Keyspan, Inc the manufacturers of the Keyspan USB DMR product.
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/errno.h>
  16 #include <linux/init.h>
  17 #include <linux/slab.h>
  18 #include <linux/module.h>
  19 #include <linux/moduleparam.h>
  20 #include <linux/usb/input.h>
  21
  22 #define DRIVER_VERSION  "v0.1"
  23 #define DRIVER_AUTHOR   "Michael Downey <downey@zymeta.com>"
  24 #define DRIVER_DESC     "Driver for the USB Keyspan remote control."
  25 #define DRIVER_LICENSE  "GPL"
  26
  27 /* Parameters that can be passed to the driver. */
  28 static int debug;
  29 module_param(debug, int, 0444);
  30 MODULE_PARM_DESC(debug, "Enable extra debug messages and information");
  31
  32 /* Vendor and product ids */
  33 #define USB_KEYSPAN_VENDOR_ID           0x06CD
  34 #define USB_KEYSPAN_PRODUCT_UIA11       0x0202
  35
  36 /* Defines for converting the data from the remote. */
  37 #define ZERO            0x18
  38 #define ZERO_MASK       0x1F    /* 5 bits for a 0 */
  39 #define ONE             0x3C
  40 #define ONE_MASK        0x3F    /* 6 bits for a 1 */
  41 #define SYNC            0x3F80
  42 #define SYNC_MASK       0x3FFF  /* 14 bits for a SYNC sequence */
  43 #define STOP            0x00
  44 #define STOP_MASK       0x1F    /* 5 bits for the STOP sequence */
  45 #define GAP             0xFF
  46
  47 #define RECV_SIZE       8       /* The UIA-11 type have a 8 byte limit. */
  48
  49 /* table of devices that work with this driver */
  50 static struct usb_device_id keyspan_table[] = {
  51         { USB_DEVICE(USB_KEYSPAN_VENDOR_ID, USB_KEYSPAN_PRODUCT_UIA11) },
  52         { }                                     /* Terminating entry */
  53 };
  54
  55 /* Structure to store all the real stuff that a remote sends to us. */
  56 struct keyspan_message {
  57         u16     system;
  58         u8      button;
  59         u8      toggle;
  60 };
  61
  62 /* Structure used for all the bit testing magic needed to be done. */
  63 struct bit_tester {
  64         u32     tester;
  65         int     len;
  66         int     pos;
  67         int     bits_left;
  68         u8      buffer[32];
  69 };
  70
  71 /* Structure to hold all of our driver specific stuff */
  72 struct usb_keyspan {
  73         char                            name[128];
  74         char                            phys[64];
  75         struct usb_device*              udev;
  76         struct input_dev                *input;
  77         struct usb_interface*           interface;
  78         struct usb_endpoint_descriptor* in_endpoint;
  79         struct urb*                     irq_urb;
  80         int                             open;
  81         dma_addr_t                      in_dma;
  82         unsigned char*                  in_buffer;
  83
  84         /* variables used to parse messages from remote. */
  85         struct bit_tester               data;
  86         int                             stage;
  87         int                             toggle;
  88 };
  89
  90 /*
  91  * Table that maps the 31 possible keycodes to input keys.
  92  * Currently there are 15 and 17 button models so RESERVED codes
  93  * are blank areas in the mapping.
  94  */
  95 static const int keyspan_key_table[] = {
  96         KEY_RESERVED,           /* 0 is just a place holder. */
  97         KEY_RESERVED,
  98         KEY_STOP,
  99         KEY_PLAYCD,
 100         KEY_RESERVED,
 101         KEY_PREVIOUSSONG,
 102         KEY_REWIND,
 103         KEY_FORWARD,
 104         KEY_NEXTSONG,
 105         KEY_RESERVED,
 106         KEY_RESERVED,
 107         KEY_RESERVED,
 108         KEY_PAUSE,
 109         KEY_VOLUMEUP,
 110         KEY_RESERVED,
 111         KEY_RESERVED,
 112         KEY_RESERVED,
 113         KEY_VOLUMEDOWN,
 114         KEY_RESERVED,
 115         KEY_UP,
 116         KEY_RESERVED,
 117         KEY_MUTE,
 118         KEY_LEFT,
 119         KEY_ENTER,
 120         KEY_RIGHT,
 121         KEY_RESERVED,
 122         KEY_RESERVED,
 123         KEY_DOWN,
 124         KEY_RESERVED,
 125         KEY_KPASTERISK,
 126         KEY_RESERVED,
 127         KEY_MENU
 128 };
 129
 130 static struct usb_driver keyspan_driver;
 131
 132 /*
 133  * Debug routine that prints out what we've received from the remote.
 134  */
 135 static void keyspan_print(struct usb_keyspan* dev) /*unsigned char* data)*/
 136 {
 137         char codes[4 * RECV_SIZE];
 138         int i;
 139
 140         for (i = 0; i < RECV_SIZE; i++)
 141                 snprintf(codes + i * 3, 4, "%02x ", dev->in_buffer[i]);
 142
 143         dev_info(&dev->udev->dev, "%s\n", codes);
 144 }
 145
 146 /*
 147  * Routine that manages the bit_tester structure.  It makes sure that there are
 148  * at least bits_needed bits loaded into the tester.
 149  */
 150 static int keyspan_load_tester(struct usb_keyspan* dev, int bits_needed)
 151 {
 152         if (dev->data.bits_left >= bits_needed)
 153                 return 0;
 154
 155         /*
 156          * Somehow we've missed the last message. The message will be repeated
 157          * though so it's not too big a deal
 158          */
 159         if (dev->data.pos >= dev->data.len) {
 160                 dev_dbg(&dev->udev->dev,
 161                         "%s - Error ran out of data. pos: %d, len: %d\n",
 162                         __FUNCTION__, dev->data.pos, dev->data.len);
 163                 return -1;
 164         }
 165
 166         /* Load as much as we can into the tester. */
 167         while ((dev->data.bits_left + 7 < (sizeof(dev->data.tester) * 8)) &&
 168                (dev->data.pos < dev->data.len)) {
 169                 dev->data.tester += (dev->data.buffer[dev->data.pos++] << dev->data.bits_left);
 170                 dev->data.bits_left += 8;
 171         }
 172
 173         return 0;
 174 }
 175
 176 /*
 177  * Routine that handles all the logic needed to parse out the message from the remote.
 178  */
 179 static void keyspan_check_data(struct usb_keyspan *remote, struct pt_regs *regs)
 180 {
 181         int i;
 182         int found = 0;
 183         struct keyspan_message message;
 184
 185         switch(remote->stage) {
 186         case 0:
 187                 /*
 188                  * In stage 0 we want to find the start of a message.  The remote sends a 0xFF as filler.
 189                  * So the first byte that isn't a FF should be the start of a new message.
 190                  */
 191                 for (i = 0; i < RECV_SIZE && remote->in_buffer[i] == GAP; ++i);
 192
 193                 if (i < RECV_SIZE) {
 194                         memcpy(remote->data.buffer, remote->in_buffer, RECV_SIZE);
 195                         remote->data.len = RECV_SIZE;
 196                         remote->data.pos = 0;
 197                         remote->data.tester = 0;
 198                         remote->data.bits_left = 0;
 199                         remote->stage = 1;
 200                 }
 201                 break;
 202
 203         case 1:
 204                 /*
 205                  * Stage 1 we should have 16 bytes and should be able to detect a
 206                  * SYNC.  The SYNC is 14 bits, 7 0's and then 7 1's.
 207                  */
 208                 memcpy(remote->data.buffer + remote->data.len, remote->in_buffer, RECV_SIZE);
 209                 remote->data.len += RECV_SIZE;
 210
 211                 found = 0;
 212                 while ((remote->data.bits_left >= 14 || remote->data.pos < remote->data.len) && !found) {
 213                         for (i = 0; i < 8; ++i) {
 214                                 if (keyspan_load_tester(remote, 14) != 0) {
 215                                         remote->stage = 0;
 216                                         return;
 217                                 }
 218
 219                                 if ((remote->data.tester & SYNC_MASK) == SYNC) {
 220                                         remote->data.tester = remote->data.tester >> 14;
 221                                         remote->data.bits_left -= 14;
 222                                         found = 1;
 223                                         break;
 224                                 } else {
 225                                         remote->data.tester = remote->data.tester >> 1;
 226                                         --remote->data.bits_left;
 227                                 }
 228                         }
 229                 }
 230
 231                 if (!found) {
 232                         remote->stage = 0;
 233                         remote->data.len = 0;
 234                 } else {
 235                         remote->stage = 2;
 236                 }
 237                 break;
 238
 239         case 2:
 240                 /*
 241                  * Stage 2 we should have 24 bytes which will be enough for a full
 242                  * message.  We need to parse out the system code, button code,
 243                  * toggle code, and stop.
 244                  */
 245                 memcpy(remote->data.buffer + remote->data.len, remote->in_buffer, RECV_SIZE);
 246                 remote->data.len += RECV_SIZE;
 247
 248                 message.system = 0;
 249                 for (i = 0; i < 9; i++) {
 250                         keyspan_load_tester(remote, 6);
 251
 252                         if ((remote->data.tester & ZERO_MASK) == ZERO) {
 253                                 message.system = message.system << 1;
 254                                 remote->data.tester = remote->data.tester >> 5;
 255                                 remote->data.bits_left -= 5;
 256                         } else if ((remote->data.tester & ONE_MASK) == ONE) {
 257                                 message.system = (message.system << 1) + 1;
 258                                 remote->data.tester = remote->data.tester >> 6;
 259                                 remote->data.bits_left -= 6;
 260                         } else {
 261                                 err("%s - Unknown sequence found in system data.\n", __FUNCTION__);
 262                                 remote->stage = 0;
 263                                 return;
 264                         }
 265                 }
 266
 267                 message.button = 0;
 268                 for (i = 0; i < 5; i++) {
 269                         keyspan_load_tester(remote, 6);
 270
 271                         if ((remote->data.tester & ZERO_MASK) == ZERO) {
 272                                 message.button = message.button << 1;
 273                                 remote->data.tester = remote->data.tester >> 5;
 274                                 remote->data.bits_left -= 5;
 275                         } else if ((remote->data.tester & ONE_MASK) == ONE) {
 276                                 message.button = (message.button << 1) + 1;
 277                                 remote->data.tester = remote->data.tester >> 6;
 278                                 remote->data.bits_left -= 6;
 279                         } else {
 280                                 err("%s - Unknown sequence found in button data.\n", __FUNCTION__);
 281                                 remote->stage = 0;
 282                                 return;
 283                         }
 284                 }
 285
 286                 keyspan_load_tester(remote, 6);
 287                 if ((remote->data.tester & ZERO_MASK) == ZERO) {
 288                         message.toggle = 0;
 289                         remote->data.tester = remote->data.tester >> 5;
 290                         remote->data.bits_left -= 5;
 291                 } else if ((remote->data.tester & ONE_MASK) == ONE) {
 292                         message.toggle = 1;
 293                         remote->data.tester = remote->data.tester >> 6;
 294                         remote->data.bits_left -= 6;
 295                 } else {
 296                         err("%s - Error in message, invalid toggle.\n", __FUNCTION__);
 297                         remote->stage = 0;
 298                         return;
 299                 }
 300
 301                 keyspan_load_tester(remote, 5);
 302                 if ((remote->data.tester & STOP_MASK) == STOP) {
 303                         remote->data.tester = remote->data.tester >> 5;
 304                         remote->data.bits_left -= 5;
 305                 } else {
 306                         err("Bad message recieved, no stop bit found.\n");
 307                 }
 308
 309                 dev_dbg(&remote->udev->dev,
 310                         "%s found valid message: system: %d, button: %d, toggle: %d\n",
 311                         __FUNCTION__, message.system, message.button, message.toggle);
 312
 313                 if (message.toggle != remote->toggle) {
 314                         input_regs(remote->input, regs);
 315                         input_report_key(remote->input, keyspan_key_table[message.button], 1);
 316                         input_report_key(remote->input, keyspan_key_table[message.button], 0);
 317                         input_sync(remote->input);
 318                         remote->toggle = message.toggle;
 319                 }
 320
 321                 remote->stage = 0;
 322                 break;
 323         }
 324 }
 325
 326 /*
 327  * Routine for sending all the initialization messages to the remote.
 328  */
 329 static int keyspan_setup(struct usb_device* dev)
 330 {
 331         int retval = 0;
 332
 333         retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 334                                  0x11, 0x40, 0x5601, 0x0, NULL, 0, 0);
 335         if (retval) {
 336                 dev_dbg(&dev->dev, "%s - failed to set bit rate due to error: %d\n",
 337                         __FUNCTION__, retval);
 338                 return(retval);
 339         }
 340
 341         retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 342                                  0x44, 0x40, 0x0, 0x0, NULL, 0, 0);
 343         if (retval) {
 344                 dev_dbg(&dev->dev, "%s - failed to set resume sensitivity due to error: %d\n",
 345                         __FUNCTION__, retval);
 346                 return(retval);
 347         }
 348
 349         retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 350                                  0x22, 0x40, 0x0, 0x0, NULL, 0, 0);
 351         if (retval) {
 352                 dev_dbg(&dev->dev, "%s - failed to turn receive on due to error: %d\n",
 353                         __FUNCTION__, retval);
 354                 return(retval);
 355         }
 356
 357         dev_dbg(&dev->dev, "%s - Setup complete.\n", __FUNCTION__);
 358         return(retval);
 359 }
 360
 361 /*
 362  * Routine used to handle a new message that has come in.
 363  */
 364 static void keyspan_irq_recv(struct urb *urb, struct pt_regs *regs)
 365 {
 366         struct usb_keyspan *dev = urb->context;
 367         int retval;
 368
 369         /* Check our status in case we need to bail out early. */
 370         switch (urb->status) {
 371         case 0:
 372                 break;
 373
 374         /* Device went away so don't keep trying to read from it. */
 375         case -ECONNRESET:
 376         case -ENOENT:
 377         case -ESHUTDOWN:
 378                 return;
 379
 380         default:
 381                 goto resubmit;
 382                 break;
 383         }
 384
 385         if (debug)
 386                 keyspan_print(dev);
 387
 388         keyspan_check_data(dev, regs);
 389
 390 resubmit:
 391         retval = usb_submit_urb(urb, GFP_ATOMIC);
 392         if (retval)
 393                 err ("%s - usb_submit_urb failed with result: %d", __FUNCTION__, retval);
 394 }
 395
 396 static int keyspan_open(struct input_dev *dev)
 397 {
 398         struct usb_keyspan *remote = dev->private;
 399
 400         remote->irq_urb->dev = remote->udev;
 401         if (usb_submit_urb(remote->irq_urb, GFP_KERNEL))
 402                 return -EIO;
 403
 404         return 0;
 405 }
 406
 407 static void keyspan_close(struct input_dev *dev)
 408 {
 409         struct usb_keyspan *remote = dev->private;
 410
 411         usb_kill_urb(remote->irq_urb);
 412 }
 413
 414 static struct usb_endpoint_descriptor *keyspan_get_in_endpoint(struct usb_host_interface *iface)
 415 {
 416
 417         struct usb_endpoint_descriptor *endpoint;
 418         int i;
 419
 420         for (i = 0; i < iface->desc.bNumEndpoints; ++i) {
 421                 endpoint = &iface->endpoint[i].desc;
 422
 423                 if (usb_endpoint_is_int_in(endpoint)) {
 424                         /* we found our interrupt in endpoint */
 425                         return endpoint;
 426                 }
 427         }
 428
 429         return NULL;
 430 }
 431
 432 /*
 433  * Routine that sets up the driver to handle a specific USB device detected on the bus.
 434  */
 435 static int keyspan_probe(struct usb_interface *interface, const struct usb_device_id *id)
 436 {
 437         struct usb_device *udev = interface_to_usbdev(interface);
 438         struct usb_endpoint_descriptor *endpoint;
 439         struct usb_keyspan *remote;
 440         struct input_dev *input_dev;
 441         int i, retval;
 442
 443         endpoint = keyspan_get_in_endpoint(interface->cur_altsetting);
 444         if (!endpoint)
 445                 return -ENODEV;
 446
 447         remote = kzalloc(sizeof(*remote), GFP_KERNEL);
 448         input_dev = input_allocate_device();
 449         if (!remote || !input_dev) {
 450                 retval = -ENOMEM;
 451                 goto fail1;
 452         }
 453
 454         remote->udev = udev;
 455         remote->input = input_dev;
 456         remote->interface = interface;
 457         remote->in_endpoint = endpoint;
 458         remote->toggle = -1;    /* Set to -1 so we will always not match the toggle from the first remote message. */
 459
 460         remote->in_buffer = usb_buffer_alloc(udev, RECV_SIZE, SLAB_ATOMIC, &remote->in_dma);
 461         if (!remote->in_buffer) {
 462                 retval = -ENOMEM;
 463                 goto fail1;
 464         }
 465
 466         remote->irq_urb = usb_alloc_urb(0, GFP_KERNEL);
 467         if (!remote->irq_urb) {
 468                 retval = -ENOMEM;
 469                 goto fail2;
 470         }
 471
 472         retval = keyspan_setup(udev);
 473         if (retval) {
 474                 retval = -ENODEV;
 475                 goto fail3;
 476         }
 477
 478         if (udev->manufacturer)
 479                 strlcpy(remote->name, udev->manufacturer, sizeof(remote->name));
 480
 481         if (udev->product) {
 482                 if (udev->manufacturer)
 483                         strlcat(remote->name, " ", sizeof(remote->name));
 484                 strlcat(remote->name, udev->product, sizeof(remote->name));
 485         }
 486
 487         if (!strlen(remote->name))
 488                 snprintf(remote->name, sizeof(remote->name),
 489                          "USB Keyspan Remote %04x:%04x",
 490                          le16_to_cpu(udev->descriptor.idVendor),
 491                          le16_to_cpu(udev->descriptor.idProduct));
 492
 493         usb_make_path(udev, remote->phys, sizeof(remote->phys));
 494         strlcat(remote->phys, "/input0", sizeof(remote->phys));
 495
 496         input_dev->name = remote->name;
 497         input_dev->phys = remote->phys;
 498         usb_to_input_id(udev, &input_dev->id);
 499         input_dev->cdev.dev = &interface->dev;
 500
 501         input_dev->evbit[0] = BIT(EV_KEY);              /* We will only report KEY events. */
 502         for (i = 0; i < ARRAY_SIZE(keyspan_key_table); i++)
 503                 if (keyspan_key_table[i] != KEY_RESERVED)
 504                         set_bit(keyspan_key_table[i], input_dev->keybit);
 505
 506         input_dev->private = remote;
 507         input_dev->open = keyspan_open;
 508         input_dev->close = keyspan_close;
 509
 510         /*
 511          * Initialize the URB to access the device. The urb gets sent to the device in keyspan_open()
 512          */
 513         usb_fill_int_urb(remote->irq_urb,
 514                          remote->udev, usb_rcvintpipe(remote->udev, remote->in_endpoint->bEndpointAddress),
 515                          remote->in_buffer, RECV_SIZE, keyspan_irq_recv, remote,
 516                          remote->in_endpoint->bInterval);
 517         remote->irq_urb->transfer_dma = remote->in_dma;
 518         remote->irq_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 519
 520         /* we can register the device now, as it is ready */
 521         input_register_device(remote->input);
 522
 523         /* save our data pointer in this interface device */
 524         usb_set_intfdata(interface, remote);
 525
 526         return 0;
 527
 528  fail3: usb_free_urb(remote->irq_urb);
 529  fail2: usb_buffer_free(udev, RECV_SIZE, remote->in_buffer, remote->in_dma);
 530  fail1: kfree(remote);
 531         input_free_device(input_dev);
 532
 533         return retval;
 534 }
 535
 536 /*
 537  * Routine called when a device is disconnected from the USB.
 538  */
 539 static void keyspan_disconnect(struct usb_interface *interface)
 540 {
 541         struct usb_keyspan *remote;
 542
 543         remote = usb_get_intfdata(interface);
 544         usb_set_intfdata(interface, NULL);
 545
 546         if (remote) {   /* We have a valid driver structure so clean up everything we allocated. */
 547                 input_unregister_device(remote->input);
 548                 usb_kill_urb(remote->irq_urb);
 549                 usb_free_urb(remote->irq_urb);
 550                 usb_buffer_free(remote->udev, RECV_SIZE, remote->in_buffer, remote->in_dma);
 551                 kfree(remote);
 552         }
 553 }
 554
 555 /*
 556  * Standard driver set up sections
 557  */
 558 static struct usb_driver keyspan_driver =
 559 {
 560         .name =         "keyspan_remote",
 561         .probe =        keyspan_probe,
 562         .disconnect =   keyspan_disconnect,
 563         .id_table =     keyspan_table
 564 };
 565
 566 static int __init usb_keyspan_init(void)
 567 {
 568         int result;
 569
 570         /* register this driver with the USB subsystem */
 571         result = usb_register(&keyspan_driver);
 572         if (result)
 573                 err("usb_register failed. Error number %d\n", result);
 574
 575         return result;
 576 }
 577
 578 static void __exit usb_keyspan_exit(void)
 579 {
 580         /* deregister this driver with the USB subsystem */
 581         usb_deregister(&keyspan_driver);
 582 }
 583
 584 module_init(usb_keyspan_init);
 585 module_exit(usb_keyspan_exit);
 586
 587 MODULE_DEVICE_TABLE(usb, keyspan_table);
 588 MODULE_AUTHOR(DRIVER_AUTHOR);
 589 MODULE_DESCRIPTION(DRIVER_DESC);
 590 MODULE_LICENSE(DRIVER_LICENSE);