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/config.h>
  15 #include <linux/kernel.h>
  16 #include <linux/errno.h>
  17 #include <linux/init.h>
  18 #include <linux/slab.h>
  19 #include <linux/module.h>
  20 #include <linux/moduleparam.h>
  21 #include <linux/input.h>
  22 #include <linux/usb.h>
  23
  24 #define DRIVER_VERSION  "v0.1"
  25 #define DRIVER_AUTHOR   "Michael Downey <downey@zymeta.com>"
  26 #define DRIVER_DESC     "Driver for the USB Keyspan remote control."
  27 #define DRIVER_LICENSE  "GPL"
  28
  29 /* Parameters that can be passed to the driver. */
  30 static int debug;
  31 module_param(debug, int, 0444);
  32 MODULE_PARM_DESC(debug, "Enable extra debug messages and information");
  33
  34 /* Vendor and product ids */
  35 #define USB_KEYSPAN_VENDOR_ID           0x06CD
  36 #define USB_KEYSPAN_PRODUCT_UIA11       0x0202
  37
  38 /* Defines for converting the data from the remote. */
  39 #define ZERO            0x18
  40 #define ZERO_MASK       0x1F    /* 5 bits for a 0 */
  41 #define ONE             0x3C
  42 #define ONE_MASK        0x3F    /* 6 bits for a 1 */
  43 #define SYNC            0x3F80
  44 #define SYNC_MASK       0x3FFF  /* 14 bits for a SYNC sequence */
  45 #define STOP            0x00
  46 #define STOP_MASK       0x1F    /* 5 bits for the STOP sequence */
  47 #define GAP             0xFF
  48
  49 #define RECV_SIZE       8       /* The UIA-11 type have a 8 byte limit. */
  50
  51 /* table of devices that work with this driver */
  52 static struct usb_device_id keyspan_table[] = {
  53         { USB_DEVICE(USB_KEYSPAN_VENDOR_ID, USB_KEYSPAN_PRODUCT_UIA11) },
  54         { }                                     /* Terminating entry */
  55 };
  56
  57 /* Structure to store all the real stuff that a remote sends to us. */
  58 struct keyspan_message {
  59         u16     system;
  60         u8      button;
  61         u8      toggle;
  62 };
  63
  64 /* Structure used for all the bit testing magic needed to be done. */
  65 struct bit_tester {
  66         u32     tester;
  67         int     len;
  68         int     pos;
  69         int     bits_left;
  70         u8      buffer[32];
  71 };
  72
  73 /* Structure to hold all of our driver specific stuff */
  74 struct usb_keyspan {
  75         char                            name[128];
  76         char                            phys[64];
  77         struct usb_device*              udev;
  78         struct input_dev                input;
  79         struct usb_interface*           interface;
  80         struct usb_endpoint_descriptor* in_endpoint;
  81         struct urb*                     irq_urb;
  82         int                             open;
  83         dma_addr_t                      in_dma;
  84         unsigned char*                  in_buffer;
  85
  86         /* variables used to parse messages from remote. */
  87         struct bit_tester               data;
  88         int                             stage;
  89         int                             toggle;
  90 };
  91
  92 /*
  93  * Table that maps the 31 possible keycodes to input keys.
  94  * Currently there are 15 and 17 button models so RESERVED codes
  95  * are blank areas in the mapping.
  96  */
  97 static int keyspan_key_table[] = {
  98         KEY_RESERVED,           /* 0 is just a place holder. */
  99         KEY_RESERVED,
 100         KEY_STOP,
 101         KEY_PLAYCD,
 102         KEY_RESERVED,
 103         KEY_PREVIOUSSONG,
 104         KEY_REWIND,
 105         KEY_FORWARD,
 106         KEY_NEXTSONG,
 107         KEY_RESERVED,
 108         KEY_RESERVED,
 109         KEY_RESERVED,
 110         KEY_PAUSE,
 111         KEY_VOLUMEUP,
 112         KEY_RESERVED,
 113         KEY_RESERVED,
 114         KEY_RESERVED,
 115         KEY_VOLUMEDOWN,
 116         KEY_RESERVED,
 117         KEY_UP,
 118         KEY_RESERVED,
 119         KEY_MUTE,
 120         KEY_LEFT,
 121         KEY_ENTER,
 122         KEY_RIGHT,
 123         KEY_RESERVED,
 124         KEY_RESERVED,
 125         KEY_DOWN,
 126         KEY_RESERVED,
 127         KEY_KPASTERISK,
 128         KEY_RESERVED,
 129         KEY_MENU
 130 };
 131
 132 static struct usb_driver keyspan_driver;
 133
 134 /*
 135  * Debug routine that prints out what we've received from the remote.
 136  */
 137 static void keyspan_print(struct usb_keyspan* dev) /*unsigned char* data)*/
 138 {
 139         char codes[4*RECV_SIZE];
 140         int i;
 141
 142         for (i = 0; i < RECV_SIZE; i++) {
 143                 snprintf(codes+i*3, 4, "%02x ", dev->in_buffer[i]);
 144         }
 145
 146         dev_info(&dev->udev->dev, "%s\n", codes);
 147 }
 148
 149 /*
 150  * Routine that manages the bit_tester structure.  It makes sure that there are
 151  * at least bits_needed bits loaded into the tester.
 152  */
 153 static int keyspan_load_tester(struct usb_keyspan* dev, int bits_needed)
 154 {
 155         if (dev->data.bits_left >= bits_needed)
 156                 return(0);
 157
 158         /*
 159          * Somehow we've missed the last message. The message will be repeated
 160          * though so it's not too big a deal
 161          */
 162         if (dev->data.pos >= dev->data.len) {
 163                 dev_dbg(&dev->udev, "%s - Error ran out of data. pos: %d, len: %d\n",
 164                         __FUNCTION__, dev->data.pos, dev->data.len);
 165                 return(-1);
 166         }
 167
 168         /* Load as much as we can into the tester. */
 169         while ((dev->data.bits_left + 7 < (sizeof(dev->data.tester) * 8)) &&
 170                (dev->data.pos < dev->data.len)) {
 171                 dev->data.tester += (dev->data.buffer[dev->data.pos++] << dev->data.bits_left);
 172                 dev->data.bits_left += 8;
 173         }
 174
 175         return(0);
 176 }
 177
 178 /*
 179  * Routine that handles all the logic needed to parse out the message from the remote.
 180  */
 181 static void keyspan_check_data(struct usb_keyspan *remote, struct pt_regs *regs)
 182 {
 183         int i;
 184         int found = 0;
 185         struct keyspan_message message;
 186
 187         switch(remote->stage) {
 188         case 0:
 189                 /*
 190                  * In stage 0 we want to find the start of a message.  The remote sends a 0xFF as filler.
 191                  * So the first byte that isn't a FF should be the start of a new message.
 192                  */
 193                 for (i = 0; i < RECV_SIZE && remote->in_buffer[i] == GAP; ++i);
 194
 195                 if (i < RECV_SIZE) {
 196                         memcpy(remote->data.buffer, remote->in_buffer, RECV_SIZE);
 197                         remote->data.len = RECV_SIZE;
 198                         remote->data.pos = 0;
 199                         remote->data.tester = 0;
 200                         remote->data.bits_left = 0;
 201                         remote->stage = 1;
 202                 }
 203                 break;
 204
 205         case 1:
 206                 /*
 207                  * Stage 1 we should have 16 bytes and should be able to detect a
 208                  * SYNC.  The SYNC is 14 bits, 7 0's and then 7 1's.
 209                  */
 210                 memcpy(remote->data.buffer + remote->data.len, remote->in_buffer, RECV_SIZE);
 211                 remote->data.len += RECV_SIZE;
 212
 213                 found = 0;
 214                 while ((remote->data.bits_left >= 14 || remote->data.pos < remote->data.len) && !found) {
 215                         for (i = 0; i < 8; ++i) {
 216                                 if (keyspan_load_tester(remote, 14) != 0) {
 217                                         remote->stage = 0;
 218                                         return;
 219                                 }
 220
 221                                 if ((remote->data.tester & SYNC_MASK) == SYNC) {
 222                                         remote->data.tester = remote->data.tester >> 14;
 223                                         remote->data.bits_left -= 14;
 224                                         found = 1;
 225                                         break;
 226                                 } else {
 227                                         remote->data.tester = remote->data.tester >> 1;
 228                                         --remote->data.bits_left;
 229                                 }
 230                         }
 231                 }
 232
 233                 if (!found) {
 234                         remote->stage = 0;
 235                         remote->data.len = 0;
 236                 } else {
 237                         remote->stage = 2;
 238                 }
 239                 break;
 240
 241         case 2:
 242                 /*
 243                  * Stage 2 we should have 24 bytes which will be enough for a full
 244                  * message.  We need to parse out the system code, button code,
 245                  * toggle code, and stop.
 246                  */
 247                 memcpy(remote->data.buffer + remote->data.len, remote->in_buffer, RECV_SIZE);
 248                 remote->data.len += RECV_SIZE;
 249
 250                 message.system = 0;
 251                 for (i = 0; i < 9; i++) {
 252                         keyspan_load_tester(remote, 6);
 253
 254                         if ((remote->data.tester & ZERO_MASK) == ZERO) {
 255                                 message.system = message.system << 1;
 256                                 remote->data.tester = remote->data.tester >> 5;
 257                                 remote->data.bits_left -= 5;
 258                         } else if ((remote->data.tester & ONE_MASK) == ONE) {
 259                                 message.system = (message.system << 1) + 1;
 260                                 remote->data.tester = remote->data.tester >> 6;
 261                                 remote->data.bits_left -= 6;
 262                         } else {
 263                                 err("%s - Unknown sequence found in system data.\n", __FUNCTION__);
 264                                 remote->stage = 0;
 265                                 return;
 266                         }
 267                 }
 268
 269                 message.button = 0;
 270                 for (i = 0; i < 5; i++) {
 271                         keyspan_load_tester(remote, 6);
 272
 273                         if ((remote->data.tester & ZERO_MASK) == ZERO) {
 274                                 message.button = message.button << 1;
 275                                 remote->data.tester = remote->data.tester >> 5;
 276                                 remote->data.bits_left -= 5;
 277                         } else if ((remote->data.tester & ONE_MASK) == ONE) {
 278                                 message.button = (message.button << 1) + 1;
 279                                 remote->data.tester = remote->data.tester >> 6;
 280                                 remote->data.bits_left -= 6;
 281                         } else {
 282                                 err("%s - Unknown sequence found in button data.\n", __FUNCTION__);
 283                                 remote->stage = 0;
 284                                 return;
 285                         }
 286                 }
 287
 288                 keyspan_load_tester(remote, 6);
 289                 if ((remote->data.tester & ZERO_MASK) == ZERO) {
 290                         message.toggle = 0;
 291                         remote->data.tester = remote->data.tester >> 5;
 292                         remote->data.bits_left -= 5;
 293                 } else if ((remote->data.tester & ONE_MASK) == ONE) {
 294                         message.toggle = 1;
 295                         remote->data.tester = remote->data.tester >> 6;
 296                         remote->data.bits_left -= 6;
 297                 } else {
 298                         err("%s - Error in message, invalid toggle.\n", __FUNCTION__);
 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,
 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         if (remote->open++)
 401                 return 0;
 402
 403         remote->irq_urb->dev = remote->udev;
 404         if (usb_submit_urb(remote->irq_urb, GFP_KERNEL)) {
 405                 remote->open--;
 406                 return -EIO;
 407         }
 408
 409         return 0;
 410 }
 411
 412 static void keyspan_close(struct input_dev *dev)
 413 {
 414         struct usb_keyspan *remote = dev->private;
 415
 416         if (!--remote->open)
 417                 usb_kill_urb(remote->irq_urb);
 418 }
 419
 420 /*
 421  * Routine that sets up the driver to handle a specific USB device detected on the bus.
 422  */
 423 static int keyspan_probe(struct usb_interface *interface, const struct usb_device_id *id)
 424 {
 425         int i;
 426         int retval = -ENOMEM;
 427         char path[64];
 428         char *buf;
 429         struct usb_keyspan *remote = NULL;
 430         struct usb_host_interface *iface_desc;
 431         struct usb_endpoint_descriptor *endpoint;
 432         struct usb_device *udev = usb_get_dev(interface_to_usbdev(interface));
 433
 434         /* allocate memory for our device state and initialize it */
 435         remote = kmalloc(sizeof(*remote), GFP_KERNEL);
 436         if (remote == NULL) {
 437                 err("Out of memory\n");
 438                 goto error;
 439         }
 440         memset(remote, 0x00, sizeof(*remote));
 441
 442         remote->udev = udev;
 443         remote->interface = interface;
 444         remote->toggle = -1;    /* Set to -1 so we will always not match the toggle from the first remote message. */
 445
 446         /* set up the endpoint information */
 447         /* use only the first in interrupt endpoint */
 448         iface_desc = interface->cur_altsetting;
 449         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
 450                 endpoint = &iface_desc->endpoint[i].desc;
 451
 452                 if (!remote->in_endpoint &&
 453                     (endpoint->bEndpointAddress & USB_DIR_IN) &&
 454                     ((endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT)) {
 455                         /* we found our interrupt in endpoint */
 456                         remote->in_endpoint = endpoint;
 457
 458                         remote->in_buffer = usb_buffer_alloc(remote->udev, RECV_SIZE, SLAB_ATOMIC, &remote->in_dma);
 459                         if (!remote->in_buffer) {
 460                                 retval = -ENOMEM;
 461                                 goto error;
 462                         }
 463                 }
 464         }
 465
 466         if (!remote->in_endpoint) {
 467                 err("Could not find interrupt input endpoint.\n");
 468                 retval = -ENODEV;
 469                 goto error;
 470         }
 471
 472         remote->irq_urb = usb_alloc_urb(0, GFP_KERNEL);
 473         if (!remote->irq_urb) {
 474                 err("Failed to allocate urb.\n");
 475                 retval = -ENOMEM;
 476                 goto error;
 477         }
 478
 479         retval = keyspan_setup(remote->udev);
 480         if (retval) {
 481                 err("Failed to setup device.\n");
 482                 retval = -ENODEV;
 483                 goto error;
 484         }
 485
 486         /*
 487          * Setup the input system with the bits we are going to be reporting
 488          */
 489         remote->input.evbit[0] = BIT(EV_KEY);           /* We will only report KEY events. */
 490         for (i = 0; i < 32; ++i) {
 491                 if (keyspan_key_table[i] != KEY_RESERVED) {
 492                         set_bit(keyspan_key_table[i], remote->input.keybit);
 493                 }
 494         }
 495
 496         remote->input.private = remote;
 497         remote->input.open = keyspan_open;
 498         remote->input.close = keyspan_close;
 499
 500         usb_make_path(remote->udev, path, 64);
 501         sprintf(remote->phys, "%s/input0", path);
 502
 503         remote->input.name = remote->name;
 504         remote->input.phys = remote->phys;
 505         remote->input.id.bustype = BUS_USB;
 506         remote->input.id.vendor = le16_to_cpu(remote->udev->descriptor.idVendor);
 507         remote->input.id.product = le16_to_cpu(remote->udev->descriptor.idProduct);
 508         remote->input.id.version = le16_to_cpu(remote->udev->descriptor.bcdDevice);
 509
 510         if (!(buf = kmalloc(63, GFP_KERNEL))) {
 511                 usb_buffer_free(remote->udev, RECV_SIZE, remote->in_buffer, remote->in_dma);
 512                 kfree(remote);
 513                 return -ENOMEM;
 514         }
 515
 516         if (remote->udev->descriptor.iManufacturer &&
 517             usb_string(remote->udev, remote->udev->descriptor.iManufacturer, buf, 63) > 0)
 518                 strcat(remote->name, buf);
 519
 520         if (remote->udev->descriptor.iProduct &&
 521             usb_string(remote->udev, remote->udev->descriptor.iProduct, buf, 63) > 0)
 522                 sprintf(remote->name, "%s %s", remote->name, buf);
 523
 524         if (!strlen(remote->name))
 525                 sprintf(remote->name, "USB Keyspan Remote %04x:%04x",
 526                         remote->input.id.vendor, remote->input.id.product);
 527
 528         kfree(buf);
 529
 530         /*
 531          * Initialize the URB to access the device. The urb gets sent to the device in keyspan_open()
 532          */
 533         usb_fill_int_urb(remote->irq_urb,
 534                          remote->udev, usb_rcvintpipe(remote->udev, remote->in_endpoint->bEndpointAddress),
 535                          remote->in_buffer, RECV_SIZE, keyspan_irq_recv, remote,
 536                          remote->in_endpoint->bInterval);
 537         remote->irq_urb->transfer_dma = remote->in_dma;
 538         remote->irq_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 539
 540         /* we can register the device now, as it is ready */
 541         input_register_device(&remote->input);
 542
 543         /* save our data pointer in this interface device */
 544         usb_set_intfdata(interface, remote);
 545
 546         /* let the user know what node this device is now attached to */
 547         info("connected: %s on %s", remote->name, path);
 548         return 0;
 549
 550 error:
 551         /*
 552          * In case of error we need to clean up any allocated buffers
 553          */
 554         if (remote->irq_urb)
 555                 usb_free_urb(remote->irq_urb);
 556
 557         if (remote->in_buffer)
 558                 usb_buffer_free(remote->udev, RECV_SIZE, remote->in_buffer, remote->in_dma);
 559
 560         if (remote)
 561                 kfree(remote);
 562
 563         return retval;
 564 }
 565
 566 /*
 567  * Routine called when a device is disconnected from the USB.
 568  */
 569 static void keyspan_disconnect(struct usb_interface *interface)
 570 {
 571         struct usb_keyspan *remote;
 572
 573         /* prevent keyspan_open() from racing keyspan_disconnect() */
 574         lock_kernel();
 575
 576         remote = usb_get_intfdata(interface);
 577         usb_set_intfdata(interface, NULL);
 578
 579         if (remote) {   /* We have a valid driver structure so clean up everything we allocated. */
 580                 input_unregister_device(&remote->input);
 581                 usb_kill_urb(remote->irq_urb);
 582                 usb_free_urb(remote->irq_urb);
 583                 usb_buffer_free(interface_to_usbdev(interface), RECV_SIZE, remote->in_buffer, remote->in_dma);
 584                 kfree(remote);
 585         }
 586
 587         unlock_kernel();
 588
 589         info("USB Keyspan now disconnected");
 590 }
 591
 592 /*
 593  * Standard driver set up sections
 594  */
 595 static struct usb_driver keyspan_driver =
 596 {
 597         .owner =        THIS_MODULE,
 598         .name =         "keyspan_remote",
 599         .probe =        keyspan_probe,
 600         .disconnect =   keyspan_disconnect,
 601         .id_table =     keyspan_table
 602 };
 603
 604 static int __init usb_keyspan_init(void)
 605 {
 606         int result;
 607
 608         /* register this driver with the USB subsystem */
 609         result = usb_register(&keyspan_driver);
 610         if (result)
 611                 err("usb_register failed. Error number %d\n", result);
 612
 613         return result;
 614 }
 615
 616 static void __exit usb_keyspan_exit(void)
 617 {
 618         /* deregister this driver with the USB subsystem */
 619         usb_deregister(&keyspan_driver);
 620 }
 621
 622 module_init(usb_keyspan_init);
 623 module_exit(usb_keyspan_exit);
 624
 625 MODULE_DEVICE_TABLE(usb, keyspan_table);
 626 MODULE_AUTHOR(DRIVER_AUTHOR);
 627 MODULE_DESCRIPTION(DRIVER_DESC);
 628 MODULE_LICENSE(DRIVER_LICENSE);