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  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  19  */
  20
  21 #include <linux/device.h>
  22 #include <linux/kernel.h>
  23 #include <linux/module.h>
  24 #include <linux/usb.h>
  25 #include <linux/usb/input.h>
  26 #include <linux/slab.h>
  27 #include <linux/completion.h>
  28 #include <media/rc-core.h>
  29
  30 #define DRIVER_NAME "iguanair"
  31 #define BUF_SIZE 152
  32
  33 struct iguanair {
  34         struct rc_dev *rc;
  35
  36         struct device *dev;
  37         struct usb_device *udev;
  38
  39         uint16_t version;
  40         uint8_t bufsize;
  41         uint8_t cycle_overhead;
  42
  43         struct mutex lock;
  44
  45         /* receiver support */
  46         bool receiver_on;
  47         dma_addr_t dma_in, dma_out;
  48         uint8_t *buf_in;
  49         struct urb *urb_in, *urb_out;
  50         struct completion completion;
  51
  52         /* transmit support */
  53         bool tx_overflow;
  54         uint32_t carrier;
  55         struct send_packet *packet;
  56
  57         char name[64];
  58         char phys[64];
  59 };
  60
  61 #define CMD_GET_VERSION         0x01
  62 #define CMD_GET_BUFSIZE         0x11
  63 #define CMD_GET_FEATURES        0x10
  64 #define CMD_SEND                0x15
  65 #define CMD_EXECUTE             0x1f
  66 #define CMD_RX_OVERFLOW         0x31
  67 #define CMD_TX_OVERFLOW         0x32
  68 #define CMD_RECEIVER_ON         0x12
  69 #define CMD_RECEIVER_OFF        0x14
  70
  71 #define DIR_IN                  0xdc
  72 #define DIR_OUT                 0xcd
  73
  74 #define MAX_IN_PACKET           8u
  75 #define MAX_OUT_PACKET          (sizeof(struct send_packet) + BUF_SIZE)
  76 #define TIMEOUT                 1000
  77 #define RX_RESOLUTION           21333
  78
  79 struct packet {
  80         uint16_t start;
  81         uint8_t direction;
  82         uint8_t cmd;
  83 };
  84
  85 struct send_packet {
  86         struct packet header;
  87         uint8_t length;
  88         uint8_t channels;
  89         uint8_t busy7;
  90         uint8_t busy4;
  91         uint8_t payload[0];
  92 };
  93
  94 static void process_ir_data(struct iguanair *ir, unsigned len)
  95 {
  96         if (len >= 4 && ir->buf_in[0] == 0 && ir->buf_in[1] == 0) {
  97                 switch (ir->buf_in[3]) {
  98                 case CMD_GET_VERSION:
  99                         if (len == 6) {
 100                                 ir->version = (ir->buf_in[5] << 8) |
 101                                                         ir->buf_in[4];
 102                                 complete(&ir->completion);
 103                         }
 104                         break;
 105                 case CMD_GET_BUFSIZE:
 106                         if (len >= 5) {
 107                                 ir->bufsize = ir->buf_in[4];
 108                                 complete(&ir->completion);
 109                         }
 110                         break;
 111                 case CMD_GET_FEATURES:
 112                         if (len > 5) {
 113                                 ir->cycle_overhead = ir->buf_in[5];
 114                                 complete(&ir->completion);
 115                         }
 116                         break;
 117                 case CMD_TX_OVERFLOW:
 118                         ir->tx_overflow = true;
 119                 case CMD_RECEIVER_OFF:
 120                 case CMD_RECEIVER_ON:
 121                 case CMD_SEND:
 122                         complete(&ir->completion);
 123                         break;
 124                 case CMD_RX_OVERFLOW:
 125                         dev_warn(ir->dev, "receive overflow\n");
 126                         ir_raw_event_reset(ir->rc);
 127                         break;
 128                 default:
 129                         dev_warn(ir->dev, "control code %02x received\n",
 130                                                         ir->buf_in[3]);
 131                         break;
 132                 }
 133         } else if (len >= 7) {
 134                 DEFINE_IR_RAW_EVENT(rawir);
 135                 unsigned i;
 136                 bool event = false;
 137
 138                 init_ir_raw_event(&rawir);
 139
 140                 for (i = 0; i < 7; i++) {
 141                         if (ir->buf_in[i] == 0x80) {
 142                                 rawir.pulse = false;
 143                                 rawir.duration = US_TO_NS(21845);
 144                         } else {
 145                                 rawir.pulse = (ir->buf_in[i] & 0x80) == 0;
 146                                 rawir.duration = ((ir->buf_in[i] & 0x7f) + 1) *
 147                                                                  RX_RESOLUTION;
 148                         }
 149
 150                         if (ir_raw_event_store_with_filter(ir->rc, &rawir))
 151                                 event = true;
 152                 }
 153
 154                 if (event)
 155                         ir_raw_event_handle(ir->rc);
 156         }
 157 }
 158
 159 static void iguanair_rx(struct urb *urb)
 160 {
 161         struct iguanair *ir;
 162         int rc;
 163
 164         if (!urb)
 165                 return;
 166
 167         ir = urb->context;
 168         if (!ir) {
 169                 usb_unlink_urb(urb);
 170                 return;
 171         }
 172
 173         switch (urb->status) {
 174         case 0:
 175                 process_ir_data(ir, urb->actual_length);
 176                 break;
 177         case -ECONNRESET:
 178         case -ENOENT:
 179         case -ESHUTDOWN:
 180                 usb_unlink_urb(urb);
 181                 return;
 182         case -EPIPE:
 183         default:
 184                 dev_dbg(ir->dev, "Error: urb status = %d\n", urb->status);
 185                 break;
 186         }
 187
 188         rc = usb_submit_urb(urb, GFP_ATOMIC);
 189         if (rc && rc != -ENODEV)
 190                 dev_warn(ir->dev, "failed to resubmit urb: %d\n", rc);
 191 }
 192
 193 static void iguanair_irq_out(struct urb *urb)
 194 {
 195         struct iguanair *ir = urb->context;
 196
 197         if (urb->status)
 198                 dev_dbg(ir->dev, "Error: out urb status = %d\n", urb->status);
 199 }
 200
 201 static int iguanair_send(struct iguanair *ir, unsigned size)
 202 {
 203         int rc;
 204
 205         INIT_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         ir->packet->header.start = 0;
 223         ir->packet->header.direction = DIR_OUT;
 224         ir->packet->header.cmd = CMD_GET_VERSION;
 225
 226         rc = iguanair_send(ir, sizeof(ir->packet->header));
 227         if (rc) {
 228                 dev_info(ir->dev, "failed to get version\n");
 229                 goto out;
 230         }
 231
 232         if (ir->version < 0x205) {
 233                 dev_err(ir->dev, "firmware 0x%04x is too old\n", ir->version);
 234                 rc = -ENODEV;
 235                 goto out;
 236         }
 237
 238         ir->bufsize = 150;
 239         ir->cycle_overhead = 65;
 240
 241         ir->packet->header.cmd = CMD_GET_BUFSIZE;
 242
 243         rc = iguanair_send(ir, sizeof(ir->packet->header));
 244         if (rc) {
 245                 dev_info(ir->dev, "failed to get buffer size\n");
 246                 goto out;
 247         }
 248
 249         if (ir->bufsize > BUF_SIZE) {
 250                 dev_info(ir->dev, "buffer size %u larger than expected\n",
 251                                                                 ir->bufsize);
 252                 ir->bufsize = BUF_SIZE;
 253         }
 254
 255         ir->packet->header.cmd = CMD_GET_FEATURES;
 256
 257         rc = iguanair_send(ir, sizeof(ir->packet->header));
 258         if (rc) {
 259                 dev_info(ir->dev, "failed to get features\n");
 260                 goto out;
 261         }
 262
 263 out:
 264         return rc;
 265 }
 266
 267 static int iguanair_receiver(struct iguanair *ir, bool enable)
 268 {
 269         int rc;
 270
 271         ir->packet->header.start = 0;
 272         ir->packet->header.direction = DIR_OUT;
 273         ir->packet->header.cmd = enable ? CMD_RECEIVER_ON : CMD_RECEIVER_OFF;
 274
 275         if (enable)
 276                 ir_raw_event_reset(ir->rc);
 277
 278         rc = iguanair_send(ir, sizeof(ir->packet->header));
 279
 280         return rc;
 281 }
 282
 283 /*
 284  * The iguana ir creates the carrier by busy spinning after each pulse or
 285  * space. 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.
 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                 /*  make up the the remainer of 4-cycle blocks */
 307                 switch (cycles & 3) {
 308                 case 0:
 309                         sevens = 0;
 310                         break;
 311                 case 1:
 312                         sevens = 3;
 313                         break;
 314                 case 2:
 315                         sevens = 2;
 316                         break;
 317                 case 3:
 318                         sevens = 1;
 319                         break;
 320                 }
 321
 322                 fours = (cycles - sevens * 7) / 4;
 323
 324                 /* magic happens here */
 325                 ir->packet->busy7 = (4 - sevens) * 2;
 326                 ir->packet->busy4 = 110 - fours;
 327         }
 328
 329         mutex_unlock(&ir->lock);
 330
 331         return carrier;
 332 }
 333
 334 static int iguanair_set_tx_mask(struct rc_dev *dev, uint32_t mask)
 335 {
 336         struct iguanair *ir = dev->priv;
 337
 338         if (mask > 15)
 339                 return 4;
 340
 341         mutex_lock(&ir->lock);
 342         ir->packet->channels = mask << 4;
 343         mutex_unlock(&ir->lock);
 344
 345         return 0;
 346 }
 347
 348 static int iguanair_tx(struct rc_dev *dev, unsigned *txbuf, unsigned count)
 349 {
 350         struct iguanair *ir = dev->priv;
 351         uint8_t space;
 352         unsigned i, size, periods, bytes;
 353         int rc;
 354
 355         mutex_lock(&ir->lock);
 356
 357         /* convert from us to carrier periods */
 358         for (i = space = size = 0; i < count; i++) {
 359                 periods = DIV_ROUND_CLOSEST(txbuf[i] * ir->carrier, 1000000);
 360                 bytes = DIV_ROUND_UP(periods, 127);
 361                 if (size + bytes > ir->bufsize) {
 362                         count = i;
 363                         break;
 364                 }
 365                 while (periods > 127) {
 366                         ir->packet->payload[size++] = 127 | space;
 367                         periods -= 127;
 368                 }
 369
 370                 ir->packet->payload[size++] = periods | space;
 371                 space ^= 0x80;
 372         }
 373
 374         if (count == 0) {
 375                 rc = -EINVAL;
 376                 goto out;
 377         }
 378
 379         ir->packet->header.start = 0;
 380         ir->packet->header.direction = DIR_OUT;
 381         ir->packet->header.cmd = CMD_SEND;
 382         ir->packet->length = size;
 383
 384         ir->tx_overflow = false;
 385
 386         rc = iguanair_send(ir, sizeof(*ir->packet) + size);
 387
 388         if (rc == 0 && ir->tx_overflow)
 389                 rc = -EOVERFLOW;
 390
 391 out:
 392         mutex_unlock(&ir->lock);
 393
 394         return rc ? rc : count;
 395 }
 396
 397 static int iguanair_open(struct rc_dev *rdev)
 398 {
 399         struct iguanair *ir = rdev->priv;
 400         int rc;
 401
 402         mutex_lock(&ir->lock);
 403
 404         rc = iguanair_receiver(ir, true);
 405         if (rc == 0)
 406                 ir->receiver_on = true;
 407
 408         mutex_unlock(&ir->lock);
 409
 410         return rc;
 411 }
 412
 413 static void iguanair_close(struct rc_dev *rdev)
 414 {
 415         struct iguanair *ir = rdev->priv;
 416         int rc;
 417
 418         mutex_lock(&ir->lock);
 419
 420         rc = iguanair_receiver(ir, false);
 421         ir->receiver_on = false;
 422         if (rc && rc != -ENODEV)
 423                 dev_warn(ir->dev, "failed to disable receiver: %d\n", rc);
 424
 425         mutex_unlock(&ir->lock);
 426 }
 427
 428 static int __devinit iguanair_probe(struct usb_interface *intf,
 429                                                 const struct usb_device_id *id)
 430 {
 431         struct usb_device *udev = interface_to_usbdev(intf);
 432         struct iguanair *ir;
 433         struct rc_dev *rc;
 434         int ret, pipein, pipeout;
 435         struct usb_host_interface *idesc;
 436
 437         ir = kzalloc(sizeof(*ir), GFP_KERNEL);
 438         rc = rc_allocate_device();
 439         if (!ir || !rc) {
 440                 ret = -ENOMEM;
 441                 goto out;
 442         }
 443
 444         ir->buf_in = usb_alloc_coherent(udev, MAX_IN_PACKET, GFP_KERNEL,
 445                                                                 &ir->dma_in);
 446         ir->packet = usb_alloc_coherent(udev, MAX_OUT_PACKET, GFP_KERNEL,
 447                                                                 &ir->dma_out);
 448         ir->urb_in = usb_alloc_urb(0, GFP_KERNEL);
 449         ir->urb_out = usb_alloc_urb(0, GFP_KERNEL);
 450
 451         if (!ir->buf_in || !ir->packet || !ir->urb_in || !ir->urb_out) {
 452                 ret = -ENOMEM;
 453                 goto out;
 454         }
 455
 456         idesc = intf->altsetting;
 457
 458         if (idesc->desc.bNumEndpoints < 2) {
 459                 ret = -ENODEV;
 460                 goto out;
 461         }
 462
 463         ir->rc = rc;
 464         ir->dev = &intf->dev;
 465         ir->udev = udev;
 466         mutex_init(&ir->lock);
 467
 468         init_completion(&ir->completion);
 469         pipeout = usb_sndintpipe(udev,
 470                                 idesc->endpoint[1].desc.bEndpointAddress);
 471         usb_fill_int_urb(ir->urb_out, udev, pipeout, ir->packet, MAX_OUT_PACKET,
 472                                                 iguanair_irq_out, ir, 1);
 473         ir->urb_out->transfer_dma = ir->dma_out;
 474         ir->urb_out->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 475
 476         pipein = usb_rcvintpipe(udev, idesc->endpoint[0].desc.bEndpointAddress);
 477         usb_fill_int_urb(ir->urb_in, udev, pipein, ir->buf_in, MAX_IN_PACKET,
 478                                                          iguanair_rx, ir, 1);
 479         ir->urb_in->transfer_dma = ir->dma_in;
 480         ir->urb_in->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
 481
 482         ret = usb_submit_urb(ir->urb_in, GFP_KERNEL);
 483         if (ret) {
 484                 dev_warn(&intf->dev, "failed to submit urb: %d\n", ret);
 485                 goto out;
 486         }
 487
 488         ret = iguanair_get_features(ir);
 489         if (ret)
 490                 goto out2;
 491
 492         snprintf(ir->name, sizeof(ir->name),
 493                 "IguanaWorks USB IR Transceiver version 0x%04x", ir->version);
 494
 495         usb_make_path(ir->udev, ir->phys, sizeof(ir->phys));
 496
 497         rc->input_name = ir->name;
 498         rc->input_phys = ir->phys;
 499         usb_to_input_id(ir->udev, &rc->input_id);
 500         rc->dev.parent = &intf->dev;
 501         rc->driver_type = RC_DRIVER_IR_RAW;
 502         rc->allowed_protos = RC_BIT_ALL;
 503         rc->priv = ir;
 504         rc->open = iguanair_open;
 505         rc->close = iguanair_close;
 506         rc->s_tx_mask = iguanair_set_tx_mask;
 507         rc->s_tx_carrier = iguanair_set_tx_carrier;
 508         rc->tx_ir = iguanair_tx;
 509         rc->driver_name = DRIVER_NAME;
 510         rc->map_name = RC_MAP_RC6_MCE;
 511         rc->timeout = MS_TO_NS(100);
 512         rc->rx_resolution = RX_RESOLUTION;
 513
 514         iguanair_set_tx_carrier(rc, 38000);
 515
 516         ret = rc_register_device(rc);
 517         if (ret < 0) {
 518                 dev_err(&intf->dev, "failed to register rc device %d", ret);
 519                 goto out2;
 520         }
 521
 522         usb_set_intfdata(intf, ir);
 523
 524         return 0;
 525 out2:
 526         usb_kill_urb(ir->urb_in);
 527         usb_kill_urb(ir->urb_out);
 528 out:
 529         if (ir) {
 530                 usb_free_urb(ir->urb_in);
 531                 usb_free_urb(ir->urb_out);
 532                 usb_free_coherent(udev, MAX_IN_PACKET, ir->buf_in, ir->dma_in);
 533                 usb_free_coherent(udev, MAX_OUT_PACKET, ir->packet,
 534                                                                 ir->dma_out);
 535         }
 536         rc_free_device(rc);
 537         kfree(ir);
 538         return ret;
 539 }
 540
 541 static void __devexit iguanair_disconnect(struct usb_interface *intf)
 542 {
 543         struct iguanair *ir = usb_get_intfdata(intf);
 544
 545         rc_unregister_device(ir->rc);
 546         usb_set_intfdata(intf, NULL);
 547         usb_kill_urb(ir->urb_in);
 548         usb_kill_urb(ir->urb_out);
 549         usb_free_urb(ir->urb_in);
 550         usb_free_urb(ir->urb_out);
 551         usb_free_coherent(ir->udev, MAX_IN_PACKET, ir->buf_in, ir->dma_in);
 552         usb_free_coherent(ir->udev, MAX_OUT_PACKET, ir->packet, ir->dma_out);
 553         kfree(ir);
 554 }
 555
 556 static int iguanair_suspend(struct usb_interface *intf, pm_message_t message)
 557 {
 558         struct iguanair *ir = usb_get_intfdata(intf);
 559         int rc = 0;
 560
 561         mutex_lock(&ir->lock);
 562
 563         if (ir->receiver_on) {
 564                 rc = iguanair_receiver(ir, false);
 565                 if (rc)
 566                         dev_warn(ir->dev, "failed to disable receiver for suspend\n");
 567         }
 568
 569         usb_kill_urb(ir->urb_in);
 570         usb_kill_urb(ir->urb_out);
 571
 572         mutex_unlock(&ir->lock);
 573
 574         return rc;
 575 }
 576
 577 static int iguanair_resume(struct usb_interface *intf)
 578 {
 579         struct iguanair *ir = usb_get_intfdata(intf);
 580         int rc = 0;
 581
 582         mutex_lock(&ir->lock);
 583
 584         rc = usb_submit_urb(ir->urb_in, GFP_KERNEL);
 585         if (rc)
 586                 dev_warn(&intf->dev, "failed to submit urb: %d\n", rc);
 587
 588         if (ir->receiver_on) {
 589                 rc = iguanair_receiver(ir, true);
 590                 if (rc)
 591                         dev_warn(ir->dev, "failed to enable receiver after resume\n");
 592         }
 593
 594         mutex_unlock(&ir->lock);
 595
 596         return rc;
 597 }
 598
 599 static const struct usb_device_id iguanair_table[] = {
 600         { USB_DEVICE(0x1781, 0x0938) },
 601         { }
 602 };
 603
 604 static struct usb_driver iguanair_driver = {
 605         .name = DRIVER_NAME,
 606         .probe = iguanair_probe,
 607         .disconnect = __devexit_p(iguanair_disconnect),
 608         .suspend = iguanair_suspend,
 609         .resume = iguanair_resume,
 610         .reset_resume = iguanair_resume,
 611         .id_table = iguanair_table,
 612         .soft_unbind = 1        /* we want to disable receiver on unbind */
 613 };
 614
 615 module_usb_driver(iguanair_driver);
 616
 617 MODULE_DESCRIPTION("IguanaWorks USB IR Transceiver");
 618 MODULE_AUTHOR("Sean Young <sean@mess.org>");
 619 MODULE_LICENSE("GPL");
 620 MODULE_DEVICE_TABLE(usb, iguanair_table);
 621