drivers/input/misc/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/usb/input.h>
  20
  21 #define DRIVER_VERSION  "v0.1"
  22 #define DRIVER_AUTHOR   "Michael Downey <downey@zymeta.com>"
  23 #define DRIVER_DESC     "Driver for the USB Keyspan remote control."
  24 #define DRIVER_LICENSE  "GPL"
  25
  26 /* Parameters that can be passed to the driver. */
  27 static int debug;
  28 module_param(debug, int, 0444);
  29 MODULE_PARM_DESC(debug, "Enable extra debug messages and information");
  30
  31 /* Vendor and product ids */
  32 #define USB_KEYSPAN_VENDOR_ID           0x06CD
  33 #define USB_KEYSPAN_PRODUCT_UIA11       0x0202
  34
  35 /* Defines for converting the data from the remote. */
  36 #define ZERO            0x18
  37 #define ZERO_MASK       0x1F    /* 5 bits for a 0 */
  38 #define ONE             0x3C
  39 #define ONE_MASK        0x3F    /* 6 bits for a 1 */
  40 #define SYNC            0x3F80
  41 #define SYNC_MASK       0x3FFF  /* 14 bits for a SYNC sequence */
  42 #define STOP            0x00
  43 #define STOP_MASK       0x1F    /* 5 bits for the STOP sequence */
  44 #define GAP             0xFF
  45
  46 #define RECV_SIZE       8       /* The UIA-11 type have a 8 byte limit. */
  47
  48 /*
  49  * Table that maps the 31 possible keycodes to input keys.
  50  * Currently there are 15 and 17 button models so RESERVED codes
  51  * are blank areas in the mapping.
  52  */
  53 static const unsigned short keyspan_key_table[] = {
  54         KEY_RESERVED,           /* 0 is just a place holder. */
  55         KEY_RESERVED,
  56         KEY_STOP,
  57         KEY_PLAYCD,
  58         KEY_RESERVED,
  59         KEY_PREVIOUSSONG,
  60         KEY_REWIND,
  61         KEY_FORWARD,
  62         KEY_NEXTSONG,
  63         KEY_RESERVED,
  64         KEY_RESERVED,
  65         KEY_RESERVED,
  66         KEY_PAUSE,
  67         KEY_VOLUMEUP,
  68         KEY_RESERVED,
  69         KEY_RESERVED,
  70         KEY_RESERVED,
  71         KEY_VOLUMEDOWN,
  72         KEY_RESERVED,
  73         KEY_UP,
  74         KEY_RESERVED,
  75         KEY_MUTE,
  76         KEY_LEFT,
  77         KEY_ENTER,
  78         KEY_RIGHT,
  79         KEY_RESERVED,
  80         KEY_RESERVED,
  81         KEY_DOWN,
  82         KEY_RESERVED,
  83         KEY_KPASTERISK,
  84         KEY_RESERVED,
  85         KEY_MENU
  86 };
  87
  88 /* table of devices that work with this driver */
  89 static struct usb_device_id keyspan_table[] = {
  90         { USB_DEVICE(USB_KEYSPAN_VENDOR_ID, USB_KEYSPAN_PRODUCT_UIA11) },
  91         { }                                     /* Terminating entry */
  92 };
  93
  94 /* Structure to store all the real stuff that a remote sends to us. */
  95 struct keyspan_message {
  96         u16     system;
  97         u8      button;
  98         u8      toggle;
  99 };
 100
 101 /* Structure used for all the bit testing magic needed to be done. */
 102 struct bit_tester {
 103         u32     tester;
 104         int     len;
 105         int     pos;
 106         int     bits_left;
 107         u8      buffer[32];
 108 };
 109
 110 /* Structure to hold all of our driver specific stuff */
 111 struct usb_keyspan {
 112         char                            name[128];
 113         char                            phys[64];
 114         unsigned short                  keymap[ARRAY_SIZE(keyspan_key_table)];
 115         struct usb_device               *udev;
 116         struct input_dev                *input;
 117         struct usb_interface            *interface;
 118         struct usb_endpoint_descriptor  *in_endpoint;
 119         struct urb*                     irq_urb;
 120         int                             open;
 121         dma_addr_t                      in_dma;
 122         unsigned char                   *in_buffer;
 123
 124         /* variables used to parse messages from remote. */
 125         struct bit_tester               data;
 126         int                             stage;
 127         int                             toggle;
 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                         __func__, 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 static void keyspan_report_button(struct usb_keyspan *remote, int button, int press)
 177 {
 178         struct input_dev *input = remote->input;
 179
 180         input_event(input, EV_MSC, MSC_SCAN, button);
 181         input_report_key(input, remote->keymap[button], press);
 182         input_sync(input);
 183 }
 184
 185 /*
 186  * Routine that handles all the logic needed to parse out the message from the remote.
 187  */
 188 static void keyspan_check_data(struct usb_keyspan *remote)
 189 {
 190         int i;
 191         int found = 0;
 192         struct keyspan_message message;
 193
 194         switch(remote->stage) {
 195         case 0:
 196                 /*
 197                  * In stage 0 we want to find the start of a message.  The remote sends a 0xFF as filler.
 198                  * So the first byte that isn't a FF should be the start of a new message.
 199                  */
 200                 for (i = 0; i < RECV_SIZE && remote->in_buffer[i] == GAP; ++i);
 201
 202                 if (i < RECV_SIZE) {
 203                         memcpy(remote->data.buffer, remote->in_buffer, RECV_SIZE);
 204                         remote->data.len = RECV_SIZE;
 205                         remote->data.pos = 0;
 206                         remote->data.tester = 0;
 207                         remote->data.bits_left = 0;
 208                         remote->stage = 1;
 209                 }
 210                 break;
 211
 212         case 1:
 213                 /*
 214                  * Stage 1 we should have 16 bytes and should be able to detect a
 215                  * SYNC.  The SYNC is 14 bits, 7 0's and then 7 1's.
 216                  */
 217                 memcpy(remote->data.buffer + remote->data.len, remote->in_buffer, RECV_SIZE);
 218                 remote->data.len += RECV_SIZE;
 219
 220                 found = 0;
 221                 while ((remote->data.bits_left >= 14 || remote->data.pos < remote->data.len) && !found) {
 222                         for (i = 0; i < 8; ++i) {
 223                                 if (keyspan_load_tester(remote, 14) != 0) {
 224                                         remote->stage = 0;
 225                                         return;
 226                                 }
 227
 228                                 if ((remote->data.tester & SYNC_MASK) == SYNC) {
 229                                         remote->data.tester = remote->data.tester >> 14;
 230                                         remote->data.bits_left -= 14;
 231                                         found = 1;
 232                                         break;
 233                                 } else {
 234                                         remote->data.tester = remote->data.tester >> 1;
 235                                         --remote->data.bits_left;
 236                                 }
 237                         }
 238                 }
 239
 240                 if (!found) {
 241                         remote->stage = 0;
 242                         remote->data.len = 0;
 243                 } else {
 244                         remote->stage = 2;
 245                 }
 246                 break;
 247
 248         case 2:
 249                 /*
 250                  * Stage 2 we should have 24 bytes which will be enough for a full
 251                  * message.  We need to parse out the system code, button code,
 252                  * toggle code, and stop.
 253                  */
 254                 memcpy(remote->data.buffer + remote->data.len, remote->in_buffer, RECV_SIZE);
 255                 remote->data.len += RECV_SIZE;
 256
 257                 message.system = 0;
 258                 for (i = 0; i < 9; i++) {
 259                         keyspan_load_tester(remote, 6);
 260
 261                         if ((remote->data.tester & ZERO_MASK) == ZERO) {
 262                                 message.system = message.system << 1;
 263                                 remote->data.tester = remote->data.tester >> 5;
 264                                 remote->data.bits_left -= 5;
 265                         } else if ((remote->data.tester & ONE_MASK) == ONE) {
 266                                 message.system = (message.system << 1) + 1;
 267                                 remote->data.tester = remote->data.tester >> 6;
 268                                 remote->data.bits_left -= 6;
 269                         } else {
 270                                 err("%s - Unknown sequence found in system data.\n", __func__);
 271                                 remote->stage = 0;
 272                                 return;
 273                         }
 274                 }
 275
 276                 message.button = 0;
 277                 for (i = 0; i < 5; i++) {
 278                         keyspan_load_tester(remote, 6);
 279
 280                         if ((remote->data.tester & ZERO_MASK) == ZERO) {
 281                                 message.button = message.button << 1;
 282                                 remote->data.tester = remote->data.tester >> 5;
 283                                 remote->data.bits_left -= 5;
 284                         } else if ((remote->data.tester & ONE_MASK) == ONE) {
 285                                 message.button = (message.button << 1) + 1;
 286                                 remote->data.tester = remote->data.tester >> 6;
 287                                 remote->data.bits_left -= 6;
 288                         } else {
 289                                 err("%s - Unknown sequence found in button data.\n", __func__);
 290                                 remote->stage = 0;
 291                                 return;
 292                         }
 293                 }
 294
 295                 keyspan_load_tester(remote, 6);
 296                 if ((remote->data.tester & ZERO_MASK) == ZERO) {
 297                         message.toggle = 0;
 298                         remote->data.tester = remote->data.tester >> 5;
 299                         remote->data.bits_left -= 5;
 300                 } else if ((remote->data.tester & ONE_MASK) == ONE) {
 301                         message.toggle = 1;
 302                         remote->data.tester = remote->data.tester >> 6;
 303                         remote->data.bits_left -= 6;
 304                 } else {
 305                         err("%s - Error in message, invalid toggle.\n", __func__);
 306                         remote->stage = 0;
 307                         return;
 308                 }
 309
 310                 keyspan_load_tester(remote, 5);
 311                 if ((remote->data.tester & STOP_MASK) == STOP) {
 312                         remote->data.tester = remote->data.tester >> 5;
 313                         remote->data.bits_left -= 5;
 314                 } else {
 315                         err("Bad message received, no stop bit found.\n");
 316                 }
 317
 318                 dev_dbg(&remote->udev->dev,
 319                         "%s found valid message: system: %d, button: %d, toggle: %d\n",
 320                         __func__, message.system, message.button, message.toggle);
 321
 322                 if (message.toggle != remote->toggle) {
 323                         keyspan_report_button(remote, message.button, 1);
 324                         keyspan_report_button(remote, message.button, 0);
 325                         remote->toggle = message.toggle;
 326                 }
 327
 328                 remote->stage = 0;
 329                 break;
 330         }
 331 }
 332
 333 /*
 334  * Routine for sending all the initialization messages to the remote.
 335  */
 336 static int keyspan_setup(struct usb_device* dev)
 337 {
 338         int retval = 0;
 339
 340         retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 341                                  0x11, 0x40, 0x5601, 0x0, NULL, 0, 0);
 342         if (retval) {
 343                 dev_dbg(&dev->dev, "%s - failed to set bit rate due to error: %d\n",
 344                         __func__, retval);
 345                 return(retval);
 346         }
 347
 348         retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 349                                  0x44, 0x40, 0x0, 0x0, NULL, 0, 0);
 350         if (retval) {
 351                 dev_dbg(&dev->dev, "%s - failed to set resume sensitivity due to error: %d\n",
 352                         __func__, retval);
 353                 return(retval);
 354         }
 355
 356         retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
 357                                  0x22, 0x40, 0x0, 0x0, NULL, 0, 0);
 358         if (retval) {
 359                 dev_dbg(&dev->dev, "%s - failed to turn receive on due to error: %d\n",
 360                         __func__, retval);
 361                 return(retval);
 362         }
 363
 364         dev_dbg(&dev->dev, "%s - Setup complete.\n", __func__);
 365         return(retval);
 366 }
 367
 368 /*
 369  * Routine used to handle a new message that has come in.
 370  */
 371 static void keyspan_irq_recv(struct urb *urb)
 372 {
 373         struct usb_keyspan *dev = urb->context;
 374         int retval;
 375
 376         /* Check our status in case we need to bail out early. */
 377         switch (urb->status) {
 378         case 0:
 379                 break;
 380
 381         /* Device went away so don't keep trying to read from it. */
 382         case -ECONNRESET:
 383         case -ENOENT:
 384         case -ESHUTDOWN:
 385                 return;
 386
 387         default:
 388                 goto resubmit;
 389                 break;
 390         }
 391
 392         if (debug)
 393                 keyspan_print(dev);
 394
 395         keyspan_check_data(dev);
 396
 397 resubmit:
 398         retval = usb_submit_urb(urb, GFP_ATOMIC);
 399         if (retval)
 400                 err ("%s - usb_submit_urb failed with result: %d", __func__, retval);
 401 }
 402
 403 static int keyspan_open(struct input_dev *dev)
 404 {
 405         struct usb_keyspan *remote = input_get_drvdata(dev);
 406
 407         remote->irq_urb->dev = remote->udev;
 408         if (usb_submit_urb(remote->irq_urb, GFP_KERNEL))
 409                 return -EIO;
 410
 411         return 0;
 412 }
 413
 414 static void keyspan_close(struct input_dev *dev)
 415 {
 416         struct usb_keyspan *remote = input_get_drvdata(dev);
 417
 418         usb_kill_urb(remote->irq_urb);
 419 }
 420
 421 static struct usb_endpoint_descriptor *keyspan_get_in_endpoint(struct usb_host_interface *iface)
 422 {
 423
 424         struct usb_endpoint_descriptor *endpoint;
 425         int i;
 426
 427         for (i = 0; i < iface->desc.bNumEndpoints; ++i) {
 428                 endpoint = &iface->endpoint[i].desc;
 429
 430                 if (usb_endpoint_is_int_in(endpoint)) {
 431                         /* we found our interrupt in endpoint */
 432                         return endpoint;
 433                 }
 434         }
 435
 436         return NULL;
 437 }
 438
 439 /*
 440  * Routine that sets up the driver to handle a specific USB device detected on the bus.
 441  */
 442 static int keyspan_probe(struct usb_interface *interface, const struct usb_device_id *id)
 443 {
 444         struct usb_device *udev = interface_to_usbdev(interface);
 445         struct usb_endpoint_descriptor *endpoint;
 446         struct usb_keyspan *remote;
 447         struct input_dev *input_dev;
 448         int i, error;
 449
 450         endpoint = keyspan_get_in_endpoint(interface->cur_altsetting);
 451         if (!endpoint)
 452                 return -ENODEV;
 453
 454         remote = kzalloc(sizeof(*remote), GFP_KERNEL);
 455         input_dev = input_allocate_device();
 456         if (!remote || !input_dev) {
 457                 error = -ENOMEM;
 458                 goto fail1;
 459         }
 460
 461         remote->udev = udev;
 462         remote->input = input_dev;
 463         remote->interface = interface;
 464         remote->in_endpoint = endpoint;
 465         remote->toggle = -1;    /* Set to -1 so we will always not match the toggle from the first remote message. */
 466
 467         remote->in_buffer = usb_alloc_coherent(udev, RECV_SIZE, GFP_ATOMIC, &remote->in_dma);
 468         if (!remote->in_buffer) {
 469                 error = -ENOMEM;
 470                 goto fail1;
 471         }
 472
 473         remote->irq_urb = usb_alloc_urb(0, GFP_KERNEL);
 474         if (!remote->irq_urb) {
 475                 error = -ENOMEM;
 476                 goto fail2;
 477         }
 478
 479         error = keyspan_setup(udev);
 480         if (error) {
 481                 error = -ENODEV;
 482                 goto fail3;
 483         }
 484
 485         if (udev->manufacturer)
 486                 strlcpy(remote->name, udev->manufacturer, sizeof(remote->name));
 487
 488         if (udev->product) {
 489                 if (udev->manufacturer)
 490                         strlcat(remote->name, " ", sizeof(remote->name));
 491                 strlcat(remote->name, udev->product, sizeof(remote->name));
 492         }
 493
 494         if (!strlen(remote->name))
 495                 snprintf(remote->name, sizeof(remote->name),
 496                          "USB Keyspan Remote %04x:%04x",
 497                          le16_to_cpu(udev->descriptor.idVendor),
 498                          le16_to_cpu(udev->descriptor.idProduct));
 499
 500         usb_make_path(udev, remote->phys, sizeof(remote->phys));
 501         strlcat(remote->phys, "/input0", sizeof(remote->phys));
 502         memcpy(remote->keymap, keyspan_key_table, sizeof(remote->keymap));
 503
 504         input_dev->name = remote->name;
 505         input_dev->phys = remote->phys;
 506         usb_to_input_id(udev, &input_dev->id);
 507         input_dev->dev.parent = &interface->dev;
 508         input_dev->keycode = remote->keymap;
 509         input_dev->keycodesize = sizeof(unsigned short);
 510         input_dev->keycodemax = ARRAY_SIZE(remote->keymap);
 511
 512         input_set_capability(input_dev, EV_MSC, MSC_SCAN);
 513         __set_bit(EV_KEY, input_dev->evbit);
 514         for (i = 0; i < ARRAY_SIZE(keyspan_key_table); i++)
 515                 __set_bit(keyspan_key_table[i], input_dev->keybit);
 516         __clear_bit(KEY_RESERVED, input_dev->keybit);
 517
 518         input_set_drvdata(input_dev, remote);
 519
 520         input_dev->open = keyspan_open;
 521         input_dev->close = keyspan_close;
 522
 523         /*
 524          * Initialize the URB to access the device.
 525          * The urb gets sent to the device in keyspan_open()
 526          */
 527         usb_fill_int_urb(remote->irq_urb,
 528                          remote->udev,
 529                          usb_rcvintpipe(remote->udev, endpoint->bEndpointAddress),
 530                          remote->in_buffer, RECV_SIZE, keyspan_irq_recv, remote,
 531                          endpoint->bInterval);
 532         remote->irq_urb->transfer_dma = remote->in_dma;
 533         remote->irq_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 534
 535         /* we can register the device now, as it is ready */
 536         error = input_register_device(remote->input);
 537         if (error)
 538                 goto fail3;
 539
 540         /* save our data pointer in this interface device */
 541         usb_set_intfdata(interface, remote);
 542
 543         return 0;
 544
 545  fail3: usb_free_urb(remote->irq_urb);
 546  fail2: usb_free_coherent(udev, RECV_SIZE, remote->in_buffer, remote->in_dma);
 547  fail1: kfree(remote);
 548         input_free_device(input_dev);
 549
 550         return error;
 551 }
 552
 553 /*
 554  * Routine called when a device is disconnected from the USB.
 555  */
 556 static void keyspan_disconnect(struct usb_interface *interface)
 557 {
 558         struct usb_keyspan *remote;
 559
 560         remote = usb_get_intfdata(interface);
 561         usb_set_intfdata(interface, NULL);
 562
 563         if (remote) {   /* We have a valid driver structure so clean up everything we allocated. */
 564                 input_unregister_device(remote->input);
 565                 usb_kill_urb(remote->irq_urb);
 566                 usb_free_urb(remote->irq_urb);
 567                 usb_free_coherent(remote->udev, RECV_SIZE, remote->in_buffer, remote->in_dma);
 568                 kfree(remote);
 569         }
 570 }
 571
 572 /*
 573  * Standard driver set up sections
 574  */
 575 static struct usb_driver keyspan_driver =
 576 {
 577         .name =         "keyspan_remote",
 578         .probe =        keyspan_probe,
 579         .disconnect =   keyspan_disconnect,
 580         .id_table =     keyspan_table
 581 };
 582
 583 static int __init usb_keyspan_init(void)
 584 {
 585         int result;
 586
 587         /* register this driver with the USB subsystem */
 588         result = usb_register(&keyspan_driver);
 589         if (result)
 590                 err("usb_register failed. Error number %d\n", result);
 591
 592         return result;
 593 }
 594
 595 static void __exit usb_keyspan_exit(void)
 596 {
 597         /* deregister this driver with the USB subsystem */
 598         usb_deregister(&keyspan_driver);
 599 }
 600
 601 module_init(usb_keyspan_init);
 602 module_exit(usb_keyspan_exit);
 603
 604 MODULE_DEVICE_TABLE(usb, keyspan_table);
 605 MODULE_AUTHOR(DRIVER_AUTHOR);
 606 MODULE_DESCRIPTION(DRIVER_DESC);
 607 MODULE_LICENSE(DRIVER_LICENSE);