drivers/media/rc/iguanair.c

   1 /*
   2  * IguanaWorks USB IR Transceiver support
   3  *
   4  * Copyright (C) 2012 Sean Young <sean@mess.org>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  */
  16
  17 #include <linux/device.h>
  18 #include <linux/kernel.h>
  19 #include <linux/module.h>
  20 #include <linux/usb.h>
  21 #include <linux/usb/input.h>
  22 #include <linux/slab.h>
  23 #include <linux/completion.h>
  24 #include <media/rc-core.h>
  25
  26 #define DRIVER_NAME "iguanair"
  27 #define BUF_SIZE 152
  28
  29 struct iguanair {
  30         struct rc_dev *rc;
  31
  32         struct device *dev;
  33         struct usb_device *udev;
  34
  35         uint16_t version;
  36         uint8_t bufsize;
  37         uint8_t cycle_overhead;
  38
  39         struct mutex lock;
  40
  41         /* receiver support */
  42         bool receiver_on;
  43         dma_addr_t dma_in, dma_out;
  44         uint8_t *buf_in;
  45         struct urb *urb_in, *urb_out;
  46         struct completion completion;
  47
  48         /* transmit support */
  49         bool tx_overflow;
  50         uint32_t carrier;
  51         struct send_packet *packet;
  52
  53         char name[64];
  54         char phys[64];
  55 };
  56
  57 #define CMD_NOP                 0x00
  58 #define CMD_GET_VERSION         0x01
  59 #define CMD_GET_BUFSIZE         0x11
  60 #define CMD_GET_FEATURES        0x10
  61 #define CMD_SEND                0x15
  62 #define CMD_EXECUTE             0x1f
  63 #define CMD_RX_OVERFLOW         0x31
  64 #define CMD_TX_OVERFLOW         0x32
  65 #define CMD_RECEIVER_ON         0x12
  66 #define CMD_RECEIVER_OFF        0x14
  67
  68 #define DIR_IN                  0xdc
  69 #define DIR_OUT                 0xcd
  70
  71 #define MAX_IN_PACKET           8u
  72 #define MAX_OUT_PACKET          (sizeof(struct send_packet) + BUF_SIZE)
  73 #define TIMEOUT                 1000
  74 #define RX_RESOLUTION           21333
  75
  76 struct packet {
  77         uint16_t start;
  78         uint8_t direction;
  79         uint8_t cmd;
  80 };
  81
  82 struct send_packet {
  83         struct packet header;
  84         uint8_t length;
  85         uint8_t channels;
  86         uint8_t busy7;
  87         uint8_t busy4;
  88         uint8_t payload[0];
  89 };
  90
  91 static void process_ir_data(struct iguanair *ir, unsigned len)
  92 {
  93         if (len >= 4 && ir->buf_in[0] == 0 && ir->buf_in[1] == 0) {
  94                 switch (ir->buf_in[3]) {
  95                 case CMD_GET_VERSION:
  96                         if (len == 6) {
  97                                 ir->version = (ir->buf_in[5] << 8) |
  98                                                         ir->buf_in[4];
  99                                 complete(&ir->completion);
 100                         }
 101                         break;
 102                 case CMD_GET_BUFSIZE:
 103                         if (len >= 5) {
 104                                 ir->bufsize = ir->buf_in[4];
 105                                 complete(&ir->completion);
 106                         }
 107                         break;
 108                 case CMD_GET_FEATURES:
 109                         if (len > 5) {
 110                                 ir->cycle_overhead = ir->buf_in[5];
 111                                 complete(&ir->completion);
 112                         }
 113                         break;
 114                 case CMD_TX_OVERFLOW:
 115                         ir->tx_overflow = true;
 116                         /* fall through */
 117                 case CMD_RECEIVER_OFF:
 118                 case CMD_RECEIVER_ON:
 119                 case CMD_SEND:
 120                         complete(&ir->completion);
 121                         break;
 122                 case CMD_RX_OVERFLOW:
 123                         dev_warn(ir->dev, "receive overflow\n");
 124                         ir_raw_event_reset(ir->rc);
 125                         break;
 126                 default:
 127                         dev_warn(ir->dev, "control code %02x received\n",
 128                                                         ir->buf_in[3]);
 129                         break;
 130                 }
 131         } else if (len >= 7) {
 132                 struct ir_raw_event rawir = {};
 133                 unsigned i;
 134                 bool event = false;
 135
 136                 for (i = 0; i < 7; i++) {
 137                         if (ir->buf_in[i] == 0x80) {
 138                                 rawir.pulse = false;
 139                                 rawir.duration = US_TO_NS(21845);
 140                         } else {
 141                                 rawir.pulse = (ir->buf_in[i] & 0x80) == 0;
 142                                 rawir.duration = ((ir->buf_in[i] & 0x7f) + 1) *
 143                                                                  RX_RESOLUTION;
 144                         }
 145
 146                         if (ir_raw_event_store_with_filter(ir->rc, &rawir))
 147                                 event = true;
 148                 }
 149
 150                 if (event)
 151                         ir_raw_event_handle(ir->rc);
 152         }
 153 }
 154
 155 static void iguanair_rx(struct urb *urb)
 156 {
 157         struct iguanair *ir;
 158         int rc;
 159
 160         if (!urb)
 161                 return;
 162
 163         ir = urb->context;
 164         if (!ir) {
 165                 usb_unlink_urb(urb);
 166                 return;
 167         }
 168
 169         switch (urb->status) {
 170         case 0:
 171                 process_ir_data(ir, urb->actual_length);
 172                 break;
 173         case -ECONNRESET:
 174         case -ENOENT:
 175         case -ESHUTDOWN:
 176                 usb_unlink_urb(urb);
 177                 return;
 178         case -EPIPE:
 179         default:
 180                 dev_dbg(ir->dev, "Error: urb status = %d\n", urb->status);
 181                 break;
 182         }
 183
 184         rc = usb_submit_urb(urb, GFP_ATOMIC);
 185         if (rc && rc != -ENODEV)
 186                 dev_warn(ir->dev, "failed to resubmit urb: %d\n", rc);
 187 }
 188
 189 static void iguanair_irq_out(struct urb *urb)
 190 {
 191         struct iguanair *ir = urb->context;
 192
 193         if (urb->status)
 194                 dev_dbg(ir->dev, "Error: out urb status = %d\n", urb->status);
 195
 196         /* if we sent an nop packet, do not expect a response */
 197         if (urb->status == 0 && ir->packet->header.cmd == CMD_NOP)
 198                 complete(&ir->completion);
 199 }
 200
 201 static int iguanair_send(struct iguanair *ir, unsigned size)
 202 {
 203         int rc;
 204
 205         reinit_completion(&ir->completion);
 206
 207         ir->urb_out->transfer_buffer_length = size;
 208         rc = usb_submit_urb(ir->urb_out, GFP_KERNEL);
 209         if (rc)
 210                 return rc;
 211
 212         if (wait_for_completion_timeout(&ir->completion, TIMEOUT) == 0)
 213                 return -ETIMEDOUT;
 214
 215         return rc;
 216 }
 217
 218 static int iguanair_get_features(struct iguanair *ir)
 219 {
 220         int rc;
 221
 222         /*
 223          * On cold boot, the iguanair initializes on the first packet
 224          * received but does not process that packet. Send an empty
 225          * packet.
 226          */
 227         ir->packet->header.start = 0;
 228         ir->packet->header.direction = DIR_OUT;
 229         ir->packet->header.cmd = CMD_NOP;
 230         iguanair_send(ir, sizeof(ir->packet->header));
 231
 232         ir->packet->header.cmd = CMD_GET_VERSION;
 233         rc = iguanair_send(ir, sizeof(ir->packet->header));
 234         if (rc) {
 235                 dev_info(ir->dev, "failed to get version\n");
 236                 goto out;
 237         }
 238
 239         if (ir->version < 0x205) {
 240                 dev_err(ir->dev, "firmware 0x%04x is too old\n", ir->version);
 241                 rc = -ENODEV;
 242                 goto out;
 243         }
 244
 245         ir->bufsize = 150;
 246         ir->cycle_overhead = 65;
 247
 248         ir->packet->header.cmd = CMD_GET_BUFSIZE;
 249
 250         rc = iguanair_send(ir, sizeof(ir->packet->header));
 251         if (rc) {
 252                 dev_info(ir->dev, "failed to get buffer size\n");
 253                 goto out;
 254         }
 255
 256         if (ir->bufsize > BUF_SIZE) {
 257                 dev_info(ir->dev, "buffer size %u larger than expected\n",
 258                                                                 ir->bufsize);
 259                 ir->bufsize = BUF_SIZE;
 260         }
 261
 262         ir->packet->header.cmd = CMD_GET_FEATURES;
 263
 264         rc = iguanair_send(ir, sizeof(ir->packet->header));
 265         if (rc)
 266                 dev_info(ir->dev, "failed to get features\n");
 267 out:
 268         return rc;
 269 }
 270
 271 static int iguanair_receiver(struct iguanair *ir, bool enable)
 272 {
 273         ir->packet->header.start = 0;
 274         ir->packet->header.direction = DIR_OUT;
 275         ir->packet->header.cmd = enable ? CMD_RECEIVER_ON : CMD_RECEIVER_OFF;
 276
 277         if (enable)
 278                 ir_raw_event_reset(ir->rc);
 279
 280         return iguanair_send(ir, sizeof(ir->packet->header));
 281 }
 282
 283 /*
 284  * The iguanair creates the carrier by busy spinning after each half period.
 285  * This is counted in CPU cycles, with the CPU running at 24MHz. It is
 286  * broken down into 7-cycles and 4-cyles delays, with a preference for
 287  * 4-cycle delays, minus the overhead of the loop itself (cycle_overhead).
 288  */
 289 static int iguanair_set_tx_carrier(struct rc_dev *dev, uint32_t carrier)
 290 {
 291         struct iguanair *ir = dev->priv;
 292
 293         if (carrier < 25000 || carrier > 150000)
 294                 return -EINVAL;
 295
 296         mutex_lock(&ir->lock);
 297
 298         if (carrier != ir->carrier) {
 299                 uint32_t cycles, fours, sevens;
 300
 301                 ir->carrier = carrier;
 302
 303                 cycles = DIV_ROUND_CLOSEST(24000000, carrier * 2) -
 304                                                         ir->cycle_overhead;
 305
 306                 /*
 307                  * Calculate minimum number of 7 cycles needed so
 308                  * we are left with a multiple of 4; so we want to have
 309                  * (sevens * 7) & 3 == cycles & 3
 310                  */
 311                 sevens = (4 - cycles) & 3;
 312                 fours = (cycles - sevens * 7) / 4;
 313
 314                 /*
 315                  * The firmware interprets these values as a relative offset
 316                  * for a branch. Immediately following the branches, there
 317                  * 4 instructions of 7 cycles (2 bytes each) and 110
 318                  * instructions of 4 cycles (1 byte each). A relative branch
 319                  * of 0 will execute all of them, branch further for less
 320                  * cycle burning.
 321                  */
 322                 ir->packet->busy7 = (4 - sevens) * 2;
 323                 ir->packet->busy4 = 110 - fours;
 324         }
 325
 326         mutex_unlock(&ir->lock);
 327
 328         return 0;
 329 }
 330
 331 static int iguanair_set_tx_mask(struct rc_dev *dev, uint32_t mask)
 332 {
 333         struct iguanair *ir = dev->priv;
 334
 335         if (mask > 15)
 336                 return 4;
 337
 338         mutex_lock(&ir->lock);
 339         ir->packet->channels = mask << 4;
 340         mutex_unlock(&ir->lock);
 341
 342         return 0;
 343 }
 344
 345 static int iguanair_tx(struct rc_dev *dev, unsigned *txbuf, unsigned count)
 346 {
 347         struct iguanair *ir = dev->priv;
 348         unsigned int i, size, p, periods;
 349         int rc;
 350
 351         mutex_lock(&ir->lock);
 352
 353         /* convert from us to carrier periods */
 354         for (i = size = 0; i < count; i++) {
 355                 periods = DIV_ROUND_CLOSEST(txbuf[i] * ir->carrier, 1000000);
 356                 while (periods) {
 357                         p = min(periods, 127u);
 358                         if (size >= ir->bufsize) {
 359                                 rc = -EINVAL;
 360                                 goto out;
 361                         }
 362                         ir->packet->payload[size++] = p | ((i & 1) ? 0x80 : 0);
 363                         periods -= p;
 364                 }
 365         }
 366
 367         ir->packet->header.start = 0;
 368         ir->packet->header.direction = DIR_OUT;
 369         ir->packet->header.cmd = CMD_SEND;
 370         ir->packet->length = size;
 371
 372         ir->tx_overflow = false;
 373
 374         rc = iguanair_send(ir, sizeof(*ir->packet) + size);
 375
 376         if (rc == 0 && ir->tx_overflow)
 377                 rc = -EOVERFLOW;
 378
 379 out:
 380         mutex_unlock(&ir->lock);
 381
 382         return rc ? rc : count;
 383 }
 384
 385 static int iguanair_open(struct rc_dev *rdev)
 386 {
 387         struct iguanair *ir = rdev->priv;
 388         int rc;
 389
 390         mutex_lock(&ir->lock);
 391
 392         rc = iguanair_receiver(ir, true);
 393         if (rc == 0)
 394                 ir->receiver_on = true;
 395
 396         mutex_unlock(&ir->lock);
 397
 398         return rc;
 399 }
 400
 401 static void iguanair_close(struct rc_dev *rdev)
 402 {
 403         struct iguanair *ir = rdev->priv;
 404         int rc;
 405
 406         mutex_lock(&ir->lock);
 407
 408         rc = iguanair_receiver(ir, false);
 409         ir->receiver_on = false;
 410         if (rc && rc != -ENODEV)
 411                 dev_warn(ir->dev, "failed to disable receiver: %d\n", rc);
 412
 413         mutex_unlock(&ir->lock);
 414 }
 415
 416 static int iguanair_probe(struct usb_interface *intf,
 417                           const struct usb_device_id *id)
 418 {
 419         struct usb_device *udev = interface_to_usbdev(intf);
 420         struct iguanair *ir;
 421         struct rc_dev *rc;
 422         int ret, pipein, pipeout;
 423         struct usb_host_interface *idesc;
 424
 425         ir = kzalloc(sizeof(*ir), GFP_KERNEL);
 426         rc = rc_allocate_device(RC_DRIVER_IR_RAW);
 427         if (!ir || !rc) {
 428                 ret = -ENOMEM;
 429                 goto out;
 430         }
 431
 432         ir->buf_in = usb_alloc_coherent(udev, MAX_IN_PACKET, GFP_KERNEL,
 433                                                                 &ir->dma_in);
 434         ir->packet = usb_alloc_coherent(udev, MAX_OUT_PACKET, GFP_KERNEL,
 435                                                                 &ir->dma_out);
 436         ir->urb_in = usb_alloc_urb(0, GFP_KERNEL);
 437         ir->urb_out = usb_alloc_urb(0, GFP_KERNEL);
 438
 439         if (!ir->buf_in || !ir->packet || !ir->urb_in || !ir->urb_out) {
 440                 ret = -ENOMEM;
 441                 goto out;
 442         }
 443
 444         idesc = intf->altsetting;
 445
 446         if (idesc->desc.bNumEndpoints < 2) {
 447                 ret = -ENODEV;
 448                 goto out;
 449         }
 450
 451         ir->rc = rc;
 452         ir->dev = &intf->dev;
 453         ir->udev = udev;
 454         mutex_init(&ir->lock);
 455
 456         init_completion(&ir->completion);
 457         pipeout = usb_sndintpipe(udev,
 458                                 idesc->endpoint[1].desc.bEndpointAddress);
 459         usb_fill_int_urb(ir->urb_out, udev, pipeout, ir->packet, MAX_OUT_PACKET,
 460                                                 iguanair_irq_out, ir, 1);
 461         ir->urb_out->transfer_dma = ir->dma_out;
 462         ir->urb_out->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 463
 464         pipein = usb_rcvintpipe(udev, idesc->endpoint[0].desc.bEndpointAddress);
 465         usb_fill_int_urb(ir->urb_in, udev, pipein, ir->buf_in, MAX_IN_PACKET,
 466                                                          iguanair_rx, ir, 1);
 467         ir->urb_in->transfer_dma = ir->dma_in;
 468         ir->urb_in->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 469
 470         ret = usb_submit_urb(ir->urb_in, GFP_KERNEL);
 471         if (ret) {
 472                 dev_warn(&intf->dev, "failed to submit urb: %d\n", ret);
 473                 goto out;
 474         }
 475
 476         ret = iguanair_get_features(ir);
 477         if (ret)
 478                 goto out2;
 479
 480         snprintf(ir->name, sizeof(ir->name),
 481                 "IguanaWorks USB IR Transceiver version 0x%04x", ir->version);
 482
 483         usb_make_path(ir->udev, ir->phys, sizeof(ir->phys));
 484
 485         rc->device_name = ir->name;
 486         rc->input_phys = ir->phys;
 487         usb_to_input_id(ir->udev, &rc->input_id);
 488         rc->dev.parent = &intf->dev;
 489         rc->allowed_protocols = RC_PROTO_BIT_ALL_IR_DECODER;
 490         rc->priv = ir;
 491         rc->open = iguanair_open;
 492         rc->close = iguanair_close;
 493         rc->s_tx_mask = iguanair_set_tx_mask;
 494         rc->s_tx_carrier = iguanair_set_tx_carrier;
 495         rc->tx_ir = iguanair_tx;
 496         rc->driver_name = DRIVER_NAME;
 497         rc->map_name = RC_MAP_RC6_MCE;
 498         rc->min_timeout = 1;
 499         rc->timeout = IR_DEFAULT_TIMEOUT;
 500         rc->max_timeout = 10 * IR_DEFAULT_TIMEOUT;
 501         rc->rx_resolution = RX_RESOLUTION;
 502
 503         iguanair_set_tx_carrier(rc, 38000);
 504         iguanair_set_tx_mask(rc, 0);
 505
 506         ret = rc_register_device(rc);
 507         if (ret < 0) {
 508                 dev_err(&intf->dev, "failed to register rc device %d", ret);
 509                 goto out2;
 510         }
 511
 512         usb_set_intfdata(intf, ir);
 513
 514         return 0;
 515 out2:
 516         usb_kill_urb(ir->urb_in);
 517         usb_kill_urb(ir->urb_out);
 518 out:
 519         if (ir) {
 520                 usb_free_urb(ir->urb_in);
 521                 usb_free_urb(ir->urb_out);
 522                 usb_free_coherent(udev, MAX_IN_PACKET, ir->buf_in, ir->dma_in);
 523                 usb_free_coherent(udev, MAX_OUT_PACKET, ir->packet,
 524                                                                 ir->dma_out);
 525         }
 526         rc_free_device(rc);
 527         kfree(ir);
 528         return ret;
 529 }
 530
 531 static void iguanair_disconnect(struct usb_interface *intf)
 532 {
 533         struct iguanair *ir = usb_get_intfdata(intf);
 534
 535         rc_unregister_device(ir->rc);
 536         usb_set_intfdata(intf, NULL);
 537         usb_kill_urb(ir->urb_in);
 538         usb_kill_urb(ir->urb_out);
 539         usb_free_urb(ir->urb_in);
 540         usb_free_urb(ir->urb_out);
 541         usb_free_coherent(ir->udev, MAX_IN_PACKET, ir->buf_in, ir->dma_in);
 542         usb_free_coherent(ir->udev, MAX_OUT_PACKET, ir->packet, ir->dma_out);
 543         kfree(ir);
 544 }
 545
 546 static int iguanair_suspend(struct usb_interface *intf, pm_message_t message)
 547 {
 548         struct iguanair *ir = usb_get_intfdata(intf);
 549         int rc = 0;
 550
 551         mutex_lock(&ir->lock);
 552
 553         if (ir->receiver_on) {
 554                 rc = iguanair_receiver(ir, false);
 555                 if (rc)
 556                         dev_warn(ir->dev, "failed to disable receiver for suspend\n");
 557         }
 558
 559         usb_kill_urb(ir->urb_in);
 560         usb_kill_urb(ir->urb_out);
 561
 562         mutex_unlock(&ir->lock);
 563
 564         return rc;
 565 }
 566
 567 static int iguanair_resume(struct usb_interface *intf)
 568 {
 569         struct iguanair *ir = usb_get_intfdata(intf);
 570         int rc = 0;
 571
 572         mutex_lock(&ir->lock);
 573
 574         rc = usb_submit_urb(ir->urb_in, GFP_KERNEL);
 575         if (rc)
 576                 dev_warn(&intf->dev, "failed to submit urb: %d\n", rc);
 577
 578         if (ir->receiver_on) {
 579                 rc = iguanair_receiver(ir, true);
 580                 if (rc)
 581                         dev_warn(ir->dev, "failed to enable receiver after resume\n");
 582         }
 583
 584         mutex_unlock(&ir->lock);
 585
 586         return rc;
 587 }
 588
 589 static const struct usb_device_id iguanair_table[] = {
 590         { USB_DEVICE(0x1781, 0x0938) },
 591         { }
 592 };
 593
 594 static struct usb_driver iguanair_driver = {
 595         .name = DRIVER_NAME,
 596         .probe = iguanair_probe,
 597         .disconnect = iguanair_disconnect,
 598         .suspend = iguanair_suspend,
 599         .resume = iguanair_resume,
 600         .reset_resume = iguanair_resume,
 601         .id_table = iguanair_table,
 602         .soft_unbind = 1        /* we want to disable receiver on unbind */
 603 };
 604
 605 module_usb_driver(iguanair_driver);
 606
 607 MODULE_DESCRIPTION("IguanaWorks USB IR Transceiver");
 608 MODULE_AUTHOR("Sean Young <sean@mess.org>");
 609 MODULE_LICENSE("GPL");
 610 MODULE_DEVICE_TABLE(usb, iguanair_table);
 611