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                 case CMD_RECEIVER_OFF:
 117                 case CMD_RECEIVER_ON:
 118                 case CMD_SEND:
 119                         complete(&ir->completion);
 120                         break;
 121                 case CMD_RX_OVERFLOW:
 122                         dev_warn(ir->dev, "receive overflow\n");
 123                         ir_raw_event_reset(ir->rc);
 124                         break;
 125                 default:
 126                         dev_warn(ir->dev, "control code %02x received\n",
 127                                                         ir->buf_in[3]);
 128                         break;
 129                 }
 130         } else if (len >= 7) {
 131                 DEFINE_IR_RAW_EVENT(rawir);
 132                 unsigned i;
 133                 bool event = false;
 134
 135                 init_ir_raw_event(&rawir);
 136
 137                 for (i = 0; i < 7; i++) {
 138                         if (ir->buf_in[i] == 0x80) {
 139                                 rawir.pulse = false;
 140                                 rawir.duration = US_TO_NS(21845);
 141                         } else {
 142                                 rawir.pulse = (ir->buf_in[i] & 0x80) == 0;
 143                                 rawir.duration = ((ir->buf_in[i] & 0x7f) + 1) *
 144                                                                  RX_RESOLUTION;
 145                         }
 146
 147                         if (ir_raw_event_store_with_filter(ir->rc, &rawir))
 148                                 event = true;
 149                 }
 150
 151                 if (event)
 152                         ir_raw_event_handle(ir->rc);
 153         }
 154 }
 155
 156 static void iguanair_rx(struct urb *urb)
 157 {
 158         struct iguanair *ir;
 159         int rc;
 160
 161         if (!urb)
 162                 return;
 163
 164         ir = urb->context;
 165         if (!ir) {
 166                 usb_unlink_urb(urb);
 167                 return;
 168         }
 169
 170         switch (urb->status) {
 171         case 0:
 172                 process_ir_data(ir, urb->actual_length);
 173                 break;
 174         case -ECONNRESET:
 175         case -ENOENT:
 176         case -ESHUTDOWN:
 177                 usb_unlink_urb(urb);
 178                 return;
 179         case -EPIPE:
 180         default:
 181                 dev_dbg(ir->dev, "Error: urb status = %d\n", urb->status);
 182                 break;
 183         }
 184
 185         rc = usb_submit_urb(urb, GFP_ATOMIC);
 186         if (rc && rc != -ENODEV)
 187                 dev_warn(ir->dev, "failed to resubmit urb: %d\n", rc);
 188 }
 189
 190 static void iguanair_irq_out(struct urb *urb)
 191 {
 192         struct iguanair *ir = urb->context;
 193
 194         if (urb->status)
 195                 dev_dbg(ir->dev, "Error: out urb status = %d\n", urb->status);
 196
 197         /* if we sent an nop packet, do not expect a response */
 198         if (urb->status == 0 && ir->packet->header.cmd == CMD_NOP)
 199                 complete(&ir->completion);
 200 }
 201
 202 static int iguanair_send(struct iguanair *ir, unsigned size)
 203 {
 204         int rc;
 205
 206         reinit_completion(&ir->completion);
 207
 208         ir->urb_out->transfer_buffer_length = size;
 209         rc = usb_submit_urb(ir->urb_out, GFP_KERNEL);
 210         if (rc)
 211                 return rc;
 212
 213         if (wait_for_completion_timeout(&ir->completion, TIMEOUT) == 0)
 214                 return -ETIMEDOUT;
 215
 216         return rc;
 217 }
 218
 219 static int iguanair_get_features(struct iguanair *ir)
 220 {
 221         int rc;
 222
 223         /*
 224          * On cold boot, the iguanair initializes on the first packet
 225          * received but does not process that packet. Send an empty
 226          * packet.
 227          */
 228         ir->packet->header.start = 0;
 229         ir->packet->header.direction = DIR_OUT;
 230         ir->packet->header.cmd = CMD_NOP;
 231         iguanair_send(ir, sizeof(ir->packet->header));
 232
 233         ir->packet->header.cmd = CMD_GET_VERSION;
 234         rc = iguanair_send(ir, sizeof(ir->packet->header));
 235         if (rc) {
 236                 dev_info(ir->dev, "failed to get version\n");
 237                 goto out;
 238         }
 239
 240         if (ir->version < 0x205) {
 241                 dev_err(ir->dev, "firmware 0x%04x is too old\n", ir->version);
 242                 rc = -ENODEV;
 243                 goto out;
 244         }
 245
 246         ir->bufsize = 150;
 247         ir->cycle_overhead = 65;
 248
 249         ir->packet->header.cmd = CMD_GET_BUFSIZE;
 250
 251         rc = iguanair_send(ir, sizeof(ir->packet->header));
 252         if (rc) {
 253                 dev_info(ir->dev, "failed to get buffer size\n");
 254                 goto out;
 255         }
 256
 257         if (ir->bufsize > BUF_SIZE) {
 258                 dev_info(ir->dev, "buffer size %u larger than expected\n",
 259                                                                 ir->bufsize);
 260                 ir->bufsize = BUF_SIZE;
 261         }
 262
 263         ir->packet->header.cmd = CMD_GET_FEATURES;
 264
 265         rc = iguanair_send(ir, sizeof(ir->packet->header));
 266         if (rc)
 267                 dev_info(ir->dev, "failed to get features\n");
 268 out:
 269         return rc;
 270 }
 271
 272 static int iguanair_receiver(struct iguanair *ir, bool enable)
 273 {
 274         ir->packet->header.start = 0;
 275         ir->packet->header.direction = DIR_OUT;
 276         ir->packet->header.cmd = enable ? CMD_RECEIVER_ON : CMD_RECEIVER_OFF;
 277
 278         if (enable)
 279                 ir_raw_event_reset(ir->rc);
 280
 281         return iguanair_send(ir, sizeof(ir->packet->header));
 282 }
 283
 284 /*
 285  * The iguanair creates the carrier by busy spinning after each half period.
 286  * This is counted in CPU cycles, with the CPU running at 24MHz. It is
 287  * broken down into 7-cycles and 4-cyles delays, with a preference for
 288  * 4-cycle delays, minus the overhead of the loop itself (cycle_overhead).
 289  */
 290 static int iguanair_set_tx_carrier(struct rc_dev *dev, uint32_t carrier)
 291 {
 292         struct iguanair *ir = dev->priv;
 293
 294         if (carrier < 25000 || carrier > 150000)
 295                 return -EINVAL;
 296
 297         mutex_lock(&ir->lock);
 298
 299         if (carrier != ir->carrier) {
 300                 uint32_t cycles, fours, sevens;
 301
 302                 ir->carrier = carrier;
 303
 304                 cycles = DIV_ROUND_CLOSEST(24000000, carrier * 2) -
 305                                                         ir->cycle_overhead;
 306
 307                 /*
 308                  * Calculate minimum number of 7 cycles needed so
 309                  * we are left with a multiple of 4; so we want to have
 310                  * (sevens * 7) & 3 == cycles & 3
 311                  */
 312                 sevens = (4 - cycles) & 3;
 313                 fours = (cycles - sevens * 7) / 4;
 314
 315                 /*
 316                  * The firmware interprets these values as a relative offset
 317                  * for a branch. Immediately following the branches, there
 318                  * 4 instructions of 7 cycles (2 bytes each) and 110
 319                  * instructions of 4 cycles (1 byte each). A relative branch
 320                  * of 0 will execute all of them, branch further for less
 321                  * cycle burning.
 322                  */
 323                 ir->packet->busy7 = (4 - sevens) * 2;
 324                 ir->packet->busy4 = 110 - fours;
 325         }
 326
 327         mutex_unlock(&ir->lock);
 328
 329         return 0;
 330 }
 331
 332 static int iguanair_set_tx_mask(struct rc_dev *dev, uint32_t mask)
 333 {
 334         struct iguanair *ir = dev->priv;
 335
 336         if (mask > 15)
 337                 return 4;
 338
 339         mutex_lock(&ir->lock);
 340         ir->packet->channels = mask << 4;
 341         mutex_unlock(&ir->lock);
 342
 343         return 0;
 344 }
 345
 346 static int iguanair_tx(struct rc_dev *dev, unsigned *txbuf, unsigned count)
 347 {
 348         struct iguanair *ir = dev->priv;
 349         uint8_t space;
 350         unsigned i, size, periods, bytes;
 351         int rc;
 352
 353         mutex_lock(&ir->lock);
 354
 355         /* convert from us to carrier periods */
 356         for (i = space = size = 0; i < count; i++) {
 357                 periods = DIV_ROUND_CLOSEST(txbuf[i] * ir->carrier, 1000000);
 358                 bytes = DIV_ROUND_UP(periods, 127);
 359                 if (size + bytes > ir->bufsize) {
 360                         rc = -EINVAL;
 361                         goto out;
 362                 }
 363                 while (periods) {
 364                         unsigned p = min(periods, 127u);
 365                         ir->packet->payload[size++] = p | space;
 366                         periods -= p;
 367                 }
 368                 space ^= 0x80;
 369         }
 370
 371         ir->packet->header.start = 0;
 372         ir->packet->header.direction = DIR_OUT;
 373         ir->packet->header.cmd = CMD_SEND;
 374         ir->packet->length = size;
 375
 376         ir->tx_overflow = false;
 377
 378         rc = iguanair_send(ir, sizeof(*ir->packet) + size);
 379
 380         if (rc == 0 && ir->tx_overflow)
 381                 rc = -EOVERFLOW;
 382
 383 out:
 384         mutex_unlock(&ir->lock);
 385
 386         return rc ? rc : count;
 387 }
 388
 389 static int iguanair_open(struct rc_dev *rdev)
 390 {
 391         struct iguanair *ir = rdev->priv;
 392         int rc;
 393
 394         mutex_lock(&ir->lock);
 395
 396         rc = iguanair_receiver(ir, true);
 397         if (rc == 0)
 398                 ir->receiver_on = true;
 399
 400         mutex_unlock(&ir->lock);
 401
 402         return rc;
 403 }
 404
 405 static void iguanair_close(struct rc_dev *rdev)
 406 {
 407         struct iguanair *ir = rdev->priv;
 408         int rc;
 409
 410         mutex_lock(&ir->lock);
 411
 412         rc = iguanair_receiver(ir, false);
 413         ir->receiver_on = false;
 414         if (rc && rc != -ENODEV)
 415                 dev_warn(ir->dev, "failed to disable receiver: %d\n", rc);
 416
 417         mutex_unlock(&ir->lock);
 418 }
 419
 420 static int iguanair_probe(struct usb_interface *intf,
 421                           const struct usb_device_id *id)
 422 {
 423         struct usb_device *udev = interface_to_usbdev(intf);
 424         struct iguanair *ir;
 425         struct rc_dev *rc;
 426         int ret, pipein, pipeout;
 427         struct usb_host_interface *idesc;
 428
 429         ir = kzalloc(sizeof(*ir), GFP_KERNEL);
 430         rc = rc_allocate_device(RC_DRIVER_IR_RAW);
 431         if (!ir || !rc) {
 432                 ret = -ENOMEM;
 433                 goto out;
 434         }
 435
 436         ir->buf_in = usb_alloc_coherent(udev, MAX_IN_PACKET, GFP_KERNEL,
 437                                                                 &ir->dma_in);
 438         ir->packet = usb_alloc_coherent(udev, MAX_OUT_PACKET, GFP_KERNEL,
 439                                                                 &ir->dma_out);
 440         ir->urb_in = usb_alloc_urb(0, GFP_KERNEL);
 441         ir->urb_out = usb_alloc_urb(0, GFP_KERNEL);
 442
 443         if (!ir->buf_in || !ir->packet || !ir->urb_in || !ir->urb_out) {
 444                 ret = -ENOMEM;
 445                 goto out;
 446         }
 447
 448         idesc = intf->altsetting;
 449
 450         if (idesc->desc.bNumEndpoints < 2) {
 451                 ret = -ENODEV;
 452                 goto out;
 453         }
 454
 455         ir->rc = rc;
 456         ir->dev = &intf->dev;
 457         ir->udev = udev;
 458         mutex_init(&ir->lock);
 459
 460         init_completion(&ir->completion);
 461         pipeout = usb_sndintpipe(udev,
 462                                 idesc->endpoint[1].desc.bEndpointAddress);
 463         usb_fill_int_urb(ir->urb_out, udev, pipeout, ir->packet, MAX_OUT_PACKET,
 464                                                 iguanair_irq_out, ir, 1);
 465         ir->urb_out->transfer_dma = ir->dma_out;
 466         ir->urb_out->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 467
 468         pipein = usb_rcvintpipe(udev, idesc->endpoint[0].desc.bEndpointAddress);
 469         usb_fill_int_urb(ir->urb_in, udev, pipein, ir->buf_in, MAX_IN_PACKET,
 470                                                          iguanair_rx, ir, 1);
 471         ir->urb_in->transfer_dma = ir->dma_in;
 472         ir->urb_in->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 473
 474         ret = usb_submit_urb(ir->urb_in, GFP_KERNEL);
 475         if (ret) {
 476                 dev_warn(&intf->dev, "failed to submit urb: %d\n", ret);
 477                 goto out;
 478         }
 479
 480         ret = iguanair_get_features(ir);
 481         if (ret)
 482                 goto out2;
 483
 484         snprintf(ir->name, sizeof(ir->name),
 485                 "IguanaWorks USB IR Transceiver version 0x%04x", ir->version);
 486
 487         usb_make_path(ir->udev, ir->phys, sizeof(ir->phys));
 488
 489         rc->input_name = ir->name;
 490         rc->input_phys = ir->phys;
 491         usb_to_input_id(ir->udev, &rc->input_id);
 492         rc->dev.parent = &intf->dev;
 493         rc->allowed_protocols = RC_BIT_ALL_IR_DECODER;
 494         rc->priv = ir;
 495         rc->open = iguanair_open;
 496         rc->close = iguanair_close;
 497         rc->s_tx_mask = iguanair_set_tx_mask;
 498         rc->s_tx_carrier = iguanair_set_tx_carrier;
 499         rc->tx_ir = iguanair_tx;
 500         rc->driver_name = DRIVER_NAME;
 501         rc->map_name = RC_MAP_RC6_MCE;
 502         rc->min_timeout = 1;
 503         rc->timeout = IR_DEFAULT_TIMEOUT;
 504         rc->max_timeout = 10 * IR_DEFAULT_TIMEOUT;
 505         rc->rx_resolution = RX_RESOLUTION;
 506
 507         iguanair_set_tx_carrier(rc, 38000);
 508         iguanair_set_tx_mask(rc, 0);
 509
 510         ret = rc_register_device(rc);
 511         if (ret < 0) {
 512                 dev_err(&intf->dev, "failed to register rc device %d", ret);
 513                 goto out2;
 514         }
 515
 516         usb_set_intfdata(intf, ir);
 517
 518         return 0;
 519 out2:
 520         usb_kill_urb(ir->urb_in);
 521         usb_kill_urb(ir->urb_out);
 522 out:
 523         if (ir) {
 524                 usb_free_urb(ir->urb_in);
 525                 usb_free_urb(ir->urb_out);
 526                 usb_free_coherent(udev, MAX_IN_PACKET, ir->buf_in, ir->dma_in);
 527                 usb_free_coherent(udev, MAX_OUT_PACKET, ir->packet,
 528                                                                 ir->dma_out);
 529         }
 530         rc_free_device(rc);
 531         kfree(ir);
 532         return ret;
 533 }
 534
 535 static void iguanair_disconnect(struct usb_interface *intf)
 536 {
 537         struct iguanair *ir = usb_get_intfdata(intf);
 538
 539         rc_unregister_device(ir->rc);
 540         usb_set_intfdata(intf, NULL);
 541         usb_kill_urb(ir->urb_in);
 542         usb_kill_urb(ir->urb_out);
 543         usb_free_urb(ir->urb_in);
 544         usb_free_urb(ir->urb_out);
 545         usb_free_coherent(ir->udev, MAX_IN_PACKET, ir->buf_in, ir->dma_in);
 546         usb_free_coherent(ir->udev, MAX_OUT_PACKET, ir->packet, ir->dma_out);
 547         kfree(ir);
 548 }
 549
 550 static int iguanair_suspend(struct usb_interface *intf, pm_message_t message)
 551 {
 552         struct iguanair *ir = usb_get_intfdata(intf);
 553         int rc = 0;
 554
 555         mutex_lock(&ir->lock);
 556
 557         if (ir->receiver_on) {
 558                 rc = iguanair_receiver(ir, false);
 559                 if (rc)
 560                         dev_warn(ir->dev, "failed to disable receiver for suspend\n");
 561         }
 562
 563         usb_kill_urb(ir->urb_in);
 564         usb_kill_urb(ir->urb_out);
 565
 566         mutex_unlock(&ir->lock);
 567
 568         return rc;
 569 }
 570
 571 static int iguanair_resume(struct usb_interface *intf)
 572 {
 573         struct iguanair *ir = usb_get_intfdata(intf);
 574         int rc = 0;
 575
 576         mutex_lock(&ir->lock);
 577
 578         rc = usb_submit_urb(ir->urb_in, GFP_KERNEL);
 579         if (rc)
 580                 dev_warn(&intf->dev, "failed to submit urb: %d\n", rc);
 581
 582         if (ir->receiver_on) {
 583                 rc = iguanair_receiver(ir, true);
 584                 if (rc)
 585                         dev_warn(ir->dev, "failed to enable receiver after resume\n");
 586         }
 587
 588         mutex_unlock(&ir->lock);
 589
 590         return rc;
 591 }
 592
 593 static const struct usb_device_id iguanair_table[] = {
 594         { USB_DEVICE(0x1781, 0x0938) },
 595         { }
 596 };
 597
 598 static struct usb_driver iguanair_driver = {
 599         .name = DRIVER_NAME,
 600         .probe = iguanair_probe,
 601         .disconnect = iguanair_disconnect,
 602         .suspend = iguanair_suspend,
 603         .resume = iguanair_resume,
 604         .reset_resume = iguanair_resume,
 605         .id_table = iguanair_table,
 606         .soft_unbind = 1        /* we want to disable receiver on unbind */
 607 };
 608
 609 module_usb_driver(iguanair_driver);
 610
 611 MODULE_DESCRIPTION("IguanaWorks USB IR Transceiver");
 612 MODULE_AUTHOR("Sean Young <sean@mess.org>");
 613 MODULE_LICENSE("GPL");
 614 MODULE_DEVICE_TABLE(usb, iguanair_table);
 615