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/slab.h> 17 #include <linux/module.h> 18 #include <linux/usb/input.h> 19 20 /* Parameters that can be passed to the driver. */ 21 static int debug; 22 module_param(debug, int, 0444); 23 MODULE_PARM_DESC(debug, "Enable extra debug messages and information"); 24 25 /* Vendor and product ids */ 26 #define USB_KEYSPAN_VENDOR_ID 0x06CD 27 #define USB_KEYSPAN_PRODUCT_UIA11 0x0202 28 29 /* Defines for converting the data from the remote. */ 30 #define ZERO 0x18 31 #define ZERO_MASK 0x1F /* 5 bits for a 0 */ 32 #define ONE 0x3C 33 #define ONE_MASK 0x3F /* 6 bits for a 1 */ 34 #define SYNC 0x3F80 35 #define SYNC_MASK 0x3FFF /* 14 bits for a SYNC sequence */ 36 #define STOP 0x00 37 #define STOP_MASK 0x1F /* 5 bits for the STOP sequence */ 38 #define GAP 0xFF 39 40 #define RECV_SIZE 8 /* The UIA-11 type have a 8 byte limit. */ 41 42 /* 43 * Table that maps the 31 possible keycodes to input keys. 44 * Currently there are 15 and 17 button models so RESERVED codes 45 * are blank areas in the mapping. 46 */ 47 static const unsigned short keyspan_key_table[] = { 48 KEY_RESERVED, /* 0 is just a place holder. */ 49 KEY_RESERVED, 50 KEY_STOP, 51 KEY_PLAYCD, 52 KEY_RESERVED, 53 KEY_PREVIOUSSONG, 54 KEY_REWIND, 55 KEY_FORWARD, 56 KEY_NEXTSONG, 57 KEY_RESERVED, 58 KEY_RESERVED, 59 KEY_RESERVED, 60 KEY_PAUSE, 61 KEY_VOLUMEUP, 62 KEY_RESERVED, 63 KEY_RESERVED, 64 KEY_RESERVED, 65 KEY_VOLUMEDOWN, 66 KEY_RESERVED, 67 KEY_UP, 68 KEY_RESERVED, 69 KEY_MUTE, 70 KEY_LEFT, 71 KEY_ENTER, 72 KEY_RIGHT, 73 KEY_RESERVED, 74 KEY_RESERVED, 75 KEY_DOWN, 76 KEY_RESERVED, 77 KEY_KPASTERISK, 78 KEY_RESERVED, 79 KEY_MENU 80 }; 81 82 /* table of devices that work with this driver */ 83 static const struct usb_device_id keyspan_table[] = { 84 { USB_DEVICE(USB_KEYSPAN_VENDOR_ID, USB_KEYSPAN_PRODUCT_UIA11) }, 85 { } /* Terminating entry */ 86 }; 87 88 /* Structure to store all the real stuff that a remote sends to us. */ 89 struct keyspan_message { 90 u16 system; 91 u8 button; 92 u8 toggle; 93 }; 94 95 /* Structure used for all the bit testing magic needed to be done. */ 96 struct bit_tester { 97 u32 tester; 98 int len; 99 int pos; 100 int bits_left; 101 u8 buffer[32]; 102 }; 103 104 /* Structure to hold all of our driver specific stuff */ 105 struct usb_keyspan { 106 char name[128]; 107 char phys[64]; 108 unsigned short keymap[ARRAY_SIZE(keyspan_key_table)]; 109 struct usb_device *udev; 110 struct input_dev *input; 111 struct usb_interface *interface; 112 struct usb_endpoint_descriptor *in_endpoint; 113 struct urb* irq_urb; 114 int open; 115 dma_addr_t in_dma; 116 unsigned char *in_buffer; 117 118 /* variables used to parse messages from remote. */ 119 struct bit_tester data; 120 int stage; 121 int toggle; 122 }; 123 124 static struct usb_driver keyspan_driver; 125 126 /* 127 * Debug routine that prints out what we've received from the remote. 128 */ 129 static void keyspan_print(struct usb_keyspan* dev) /*unsigned char* data)*/ 130 { 131 char codes[4 * RECV_SIZE]; 132 int i; 133 134 for (i = 0; i < RECV_SIZE; i++) 135 snprintf(codes + i * 3, 4, "%02x ", dev->in_buffer[i]); 136 137 dev_info(&dev->udev->dev, "%s\n", codes); 138 } 139 140 /* 141 * Routine that manages the bit_tester structure. It makes sure that there are 142 * at least bits_needed bits loaded into the tester. 143 */ 144 static int keyspan_load_tester(struct usb_keyspan* dev, int bits_needed) 145 { 146 if (dev->data.bits_left >= bits_needed) 147 return 0; 148 149 /* 150 * Somehow we've missed the last message. The message will be repeated 151 * though so it's not too big a deal 152 */ 153 if (dev->data.pos >= dev->data.len) { 154 dev_dbg(&dev->interface->dev, 155 "%s - Error ran out of data. pos: %d, len: %d\n", 156 __func__, dev->data.pos, dev->data.len); 157 return -1; 158 } 159 160 /* Load as much as we can into the tester. */ 161 while ((dev->data.bits_left + 7 < (sizeof(dev->data.tester) * 8)) && 162 (dev->data.pos < dev->data.len)) { 163 dev->data.tester += (dev->data.buffer[dev->data.pos++] << dev->data.bits_left); 164 dev->data.bits_left += 8; 165 } 166 167 return 0; 168 } 169 170 static void keyspan_report_button(struct usb_keyspan *remote, int button, int press) 171 { 172 struct input_dev *input = remote->input; 173 174 input_event(input, EV_MSC, MSC_SCAN, button); 175 input_report_key(input, remote->keymap[button], press); 176 input_sync(input); 177 } 178 179 /* 180 * Routine that handles all the logic needed to parse out the message from the remote. 181 */ 182 static void keyspan_check_data(struct usb_keyspan *remote) 183 { 184 int i; 185 int found = 0; 186 struct keyspan_message message; 187 188 switch(remote->stage) { 189 case 0: 190 /* 191 * In stage 0 we want to find the start of a message. The remote sends a 0xFF as filler. 192 * So the first byte that isn't a FF should be the start of a new message. 193 */ 194 for (i = 0; i < RECV_SIZE && remote->in_buffer[i] == GAP; ++i); 195 196 if (i < RECV_SIZE) { 197 memcpy(remote->data.buffer, remote->in_buffer, RECV_SIZE); 198 remote->data.len = RECV_SIZE; 199 remote->data.pos = 0; 200 remote->data.tester = 0; 201 remote->data.bits_left = 0; 202 remote->stage = 1; 203 } 204 break; 205 206 case 1: 207 /* 208 * Stage 1 we should have 16 bytes and should be able to detect a 209 * SYNC. The SYNC is 14 bits, 7 0's and then 7 1's. 210 */ 211 memcpy(remote->data.buffer + remote->data.len, remote->in_buffer, RECV_SIZE); 212 remote->data.len += RECV_SIZE; 213 214 found = 0; 215 while ((remote->data.bits_left >= 14 || remote->data.pos < remote->data.len) && !found) { 216 for (i = 0; i < 8; ++i) { 217 if (keyspan_load_tester(remote, 14) != 0) { 218 remote->stage = 0; 219 return; 220 } 221 222 if ((remote->data.tester & SYNC_MASK) == SYNC) { 223 remote->data.tester = remote->data.tester >> 14; 224 remote->data.bits_left -= 14; 225 found = 1; 226 break; 227 } else { 228 remote->data.tester = remote->data.tester >> 1; 229 --remote->data.bits_left; 230 } 231 } 232 } 233 234 if (!found) { 235 remote->stage = 0; 236 remote->data.len = 0; 237 } else { 238 remote->stage = 2; 239 } 240 break; 241 242 case 2: 243 /* 244 * Stage 2 we should have 24 bytes which will be enough for a full 245 * message. We need to parse out the system code, button code, 246 * toggle code, and stop. 247 */ 248 memcpy(remote->data.buffer + remote->data.len, remote->in_buffer, RECV_SIZE); 249 remote->data.len += RECV_SIZE; 250 251 message.system = 0; 252 for (i = 0; i < 9; i++) { 253 keyspan_load_tester(remote, 6); 254 255 if ((remote->data.tester & ZERO_MASK) == ZERO) { 256 message.system = message.system << 1; 257 remote->data.tester = remote->data.tester >> 5; 258 remote->data.bits_left -= 5; 259 } else if ((remote->data.tester & ONE_MASK) == ONE) { 260 message.system = (message.system << 1) + 1; 261 remote->data.tester = remote->data.tester >> 6; 262 remote->data.bits_left -= 6; 263 } else { 264 dev_err(&remote->interface->dev, 265 "%s - Unknown sequence found in system data.\n", 266 __func__); 267 remote->stage = 0; 268 return; 269 } 270 } 271 272 message.button = 0; 273 for (i = 0; i < 5; i++) { 274 keyspan_load_tester(remote, 6); 275 276 if ((remote->data.tester & ZERO_MASK) == ZERO) { 277 message.button = message.button << 1; 278 remote->data.tester = remote->data.tester >> 5; 279 remote->data.bits_left -= 5; 280 } else if ((remote->data.tester & ONE_MASK) == ONE) { 281 message.button = (message.button << 1) + 1; 282 remote->data.tester = remote->data.tester >> 6; 283 remote->data.bits_left -= 6; 284 } else { 285 dev_err(&remote->interface->dev, 286 "%s - Unknown sequence found in button data.\n", 287 __func__); 288 remote->stage = 0; 289 return; 290 } 291 } 292 293 keyspan_load_tester(remote, 6); 294 if ((remote->data.tester & ZERO_MASK) == ZERO) { 295 message.toggle = 0; 296 remote->data.tester = remote->data.tester >> 5; 297 remote->data.bits_left -= 5; 298 } else if ((remote->data.tester & ONE_MASK) == ONE) { 299 message.toggle = 1; 300 remote->data.tester = remote->data.tester >> 6; 301 remote->data.bits_left -= 6; 302 } else { 303 dev_err(&remote->interface->dev, 304 "%s - Error in message, invalid toggle.\n", 305 __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 dev_err(&remote->interface->dev, 316 "Bad message received, no stop bit found.\n"); 317 } 318 319 dev_dbg(&remote->interface->dev, 320 "%s found valid message: system: %d, button: %d, toggle: %d\n", 321 __func__, message.system, message.button, message.toggle); 322 323 if (message.toggle != remote->toggle) { 324 keyspan_report_button(remote, message.button, 1); 325 keyspan_report_button(remote, message.button, 0); 326 remote->toggle = message.toggle; 327 } 328 329 remote->stage = 0; 330 break; 331 } 332 } 333 334 /* 335 * Routine for sending all the initialization messages to the remote. 336 */ 337 static int keyspan_setup(struct usb_device* dev) 338 { 339 int retval = 0; 340 341 retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 342 0x11, 0x40, 0x5601, 0x0, NULL, 0, 0); 343 if (retval) { 344 dev_dbg(&dev->dev, "%s - failed to set bit rate due to error: %d\n", 345 __func__, retval); 346 return(retval); 347 } 348 349 retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 350 0x44, 0x40, 0x0, 0x0, NULL, 0, 0); 351 if (retval) { 352 dev_dbg(&dev->dev, "%s - failed to set resume sensitivity due to error: %d\n", 353 __func__, retval); 354 return(retval); 355 } 356 357 retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), 358 0x22, 0x40, 0x0, 0x0, NULL, 0, 0); 359 if (retval) { 360 dev_dbg(&dev->dev, "%s - failed to turn receive on due to error: %d\n", 361 __func__, retval); 362 return(retval); 363 } 364 365 dev_dbg(&dev->dev, "%s - Setup complete.\n", __func__); 366 return(retval); 367 } 368 369 /* 370 * Routine used to handle a new message that has come in. 371 */ 372 static void keyspan_irq_recv(struct urb *urb) 373 { 374 struct usb_keyspan *dev = urb->context; 375 int retval; 376 377 /* Check our status in case we need to bail out early. */ 378 switch (urb->status) { 379 case 0: 380 break; 381 382 /* Device went away so don't keep trying to read from it. */ 383 case -ECONNRESET: 384 case -ENOENT: 385 case -ESHUTDOWN: 386 return; 387 388 default: 389 goto resubmit; 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 dev_err(&dev->interface->dev, 401 "%s - usb_submit_urb failed with result: %d\n", 402 __func__, retval); 403 } 404 405 static int keyspan_open(struct input_dev *dev) 406 { 407 struct usb_keyspan *remote = input_get_drvdata(dev); 408 409 remote->irq_urb->dev = remote->udev; 410 if (usb_submit_urb(remote->irq_urb, GFP_KERNEL)) 411 return -EIO; 412 413 return 0; 414 } 415 416 static void keyspan_close(struct input_dev *dev) 417 { 418 struct usb_keyspan *remote = input_get_drvdata(dev); 419 420 usb_kill_urb(remote->irq_urb); 421 } 422 423 static struct usb_endpoint_descriptor *keyspan_get_in_endpoint(struct usb_host_interface *iface) 424 { 425 426 struct usb_endpoint_descriptor *endpoint; 427 int i; 428 429 for (i = 0; i < iface->desc.bNumEndpoints; ++i) { 430 endpoint = &iface->endpoint[i].desc; 431 432 if (usb_endpoint_is_int_in(endpoint)) { 433 /* we found our interrupt in endpoint */ 434 return endpoint; 435 } 436 } 437 438 return NULL; 439 } 440 441 /* 442 * Routine that sets up the driver to handle a specific USB device detected on the bus. 443 */ 444 static int keyspan_probe(struct usb_interface *interface, const struct usb_device_id *id) 445 { 446 struct usb_device *udev = interface_to_usbdev(interface); 447 struct usb_endpoint_descriptor *endpoint; 448 struct usb_keyspan *remote; 449 struct input_dev *input_dev; 450 int i, error; 451 452 endpoint = keyspan_get_in_endpoint(interface->cur_altsetting); 453 if (!endpoint) 454 return -ENODEV; 455 456 remote = kzalloc(sizeof(*remote), GFP_KERNEL); 457 input_dev = input_allocate_device(); 458 if (!remote || !input_dev) { 459 error = -ENOMEM; 460 goto fail1; 461 } 462 463 remote->udev = udev; 464 remote->input = input_dev; 465 remote->interface = interface; 466 remote->in_endpoint = endpoint; 467 remote->toggle = -1; /* Set to -1 so we will always not match the toggle from the first remote message. */ 468 469 remote->in_buffer = usb_alloc_coherent(udev, RECV_SIZE, GFP_ATOMIC, &remote->in_dma); 470 if (!remote->in_buffer) { 471 error = -ENOMEM; 472 goto fail1; 473 } 474 475 remote->irq_urb = usb_alloc_urb(0, GFP_KERNEL); 476 if (!remote->irq_urb) { 477 error = -ENOMEM; 478 goto fail2; 479 } 480 481 error = keyspan_setup(udev); 482 if (error) { 483 error = -ENODEV; 484 goto fail3; 485 } 486 487 if (udev->manufacturer) 488 strlcpy(remote->name, udev->manufacturer, sizeof(remote->name)); 489 490 if (udev->product) { 491 if (udev->manufacturer) 492 strlcat(remote->name, " ", sizeof(remote->name)); 493 strlcat(remote->name, udev->product, sizeof(remote->name)); 494 } 495 496 if (!strlen(remote->name)) 497 snprintf(remote->name, sizeof(remote->name), 498 "USB Keyspan Remote %04x:%04x", 499 le16_to_cpu(udev->descriptor.idVendor), 500 le16_to_cpu(udev->descriptor.idProduct)); 501 502 usb_make_path(udev, remote->phys, sizeof(remote->phys)); 503 strlcat(remote->phys, "/input0", sizeof(remote->phys)); 504 memcpy(remote->keymap, keyspan_key_table, sizeof(remote->keymap)); 505 506 input_dev->name = remote->name; 507 input_dev->phys = remote->phys; 508 usb_to_input_id(udev, &input_dev->id); 509 input_dev->dev.parent = &interface->dev; 510 input_dev->keycode = remote->keymap; 511 input_dev->keycodesize = sizeof(unsigned short); 512 input_dev->keycodemax = ARRAY_SIZE(remote->keymap); 513 514 input_set_capability(input_dev, EV_MSC, MSC_SCAN); 515 __set_bit(EV_KEY, input_dev->evbit); 516 for (i = 0; i < ARRAY_SIZE(keyspan_key_table); i++) 517 __set_bit(keyspan_key_table[i], input_dev->keybit); 518 __clear_bit(KEY_RESERVED, input_dev->keybit); 519 520 input_set_drvdata(input_dev, remote); 521 522 input_dev->open = keyspan_open; 523 input_dev->close = keyspan_close; 524 525 /* 526 * Initialize the URB to access the device. 527 * The urb gets sent to the device in keyspan_open() 528 */ 529 usb_fill_int_urb(remote->irq_urb, 530 remote->udev, 531 usb_rcvintpipe(remote->udev, endpoint->bEndpointAddress), 532 remote->in_buffer, RECV_SIZE, keyspan_irq_recv, remote, 533 endpoint->bInterval); 534 remote->irq_urb->transfer_dma = remote->in_dma; 535 remote->irq_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; 536 537 /* we can register the device now, as it is ready */ 538 error = input_register_device(remote->input); 539 if (error) 540 goto fail3; 541 542 /* save our data pointer in this interface device */ 543 usb_set_intfdata(interface, remote); 544 545 return 0; 546 547 fail3: usb_free_urb(remote->irq_urb); 548 fail2: usb_free_coherent(udev, RECV_SIZE, remote->in_buffer, remote->in_dma); 549 fail1: kfree(remote); 550 input_free_device(input_dev); 551 552 return error; 553 } 554 555 /* 556 * Routine called when a device is disconnected from the USB. 557 */ 558 static void keyspan_disconnect(struct usb_interface *interface) 559 { 560 struct usb_keyspan *remote; 561 562 remote = usb_get_intfdata(interface); 563 usb_set_intfdata(interface, NULL); 564 565 if (remote) { /* We have a valid driver structure so clean up everything we allocated. */ 566 input_unregister_device(remote->input); 567 usb_kill_urb(remote->irq_urb); 568 usb_free_urb(remote->irq_urb); 569 usb_free_coherent(remote->udev, RECV_SIZE, remote->in_buffer, remote->in_dma); 570 kfree(remote); 571 } 572 } 573 574 /* 575 * Standard driver set up sections 576 */ 577 static struct usb_driver keyspan_driver = 578 { 579 .name = "keyspan_remote", 580 .probe = keyspan_probe, 581 .disconnect = keyspan_disconnect, 582 .id_table = keyspan_table 583 }; 584 585 module_usb_driver(keyspan_driver); 586 587 MODULE_DEVICE_TABLE(usb, keyspan_table); 588 MODULE_AUTHOR("Michael Downey <downey@zymeta.com>"); 589 MODULE_DESCRIPTION("Driver for the USB Keyspan remote control."); 590 MODULE_LICENSE("GPL"); 591