drivers/media/usb/em28xx/em28xx-input.c

   1 /*
   2   handle em28xx IR remotes via linux kernel input layer.
   3
   4    Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
   5                       Markus Rechberger <mrechberger@gmail.com>
   6                       Mauro Carvalho Chehab <mchehab@infradead.org>
   7                       Sascha Sommer <saschasommer@freenet.de>
   8
   9   This program is free software; you can redistribute it and/or modify
  10   it under the terms of the GNU General Public License as published by
  11   the Free Software Foundation; either version 2 of the License, or
  12   (at your option) any later version.
  13
  14   This program is distributed in the hope that it will be useful,
  15   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17   GNU General Public License for more details.
  18
  19   You should have received a copy of the GNU General Public License
  20   along with this program; if not, write to the Free Software
  21   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22  */
  23
  24 #include <linux/module.h>
  25 #include <linux/init.h>
  26 #include <linux/delay.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/usb.h>
  29 #include <linux/slab.h>
  30
  31 #include "em28xx.h"
  32
  33 #define EM28XX_SNAPSHOT_KEY KEY_CAMERA
  34 #define EM28XX_SBUTTON_QUERY_INTERVAL 500
  35 #define EM28XX_R0C_USBSUSP_SNAPSHOT 0x20
  36
  37 static unsigned int ir_debug;
  38 module_param(ir_debug, int, 0644);
  39 MODULE_PARM_DESC(ir_debug, "enable debug messages [IR]");
  40
  41 #define MODULE_NAME "em28xx"
  42
  43 #define i2cdprintk(fmt, arg...) \
  44         if (ir_debug) { \
  45                 printk(KERN_DEBUG "%s/ir: " fmt, ir->name , ## arg); \
  46         }
  47
  48 #define dprintk(fmt, arg...) \
  49         if (ir_debug) { \
  50                 printk(KERN_DEBUG "%s/ir: " fmt, ir->name , ## arg); \
  51         }
  52
  53 /**********************************************************
  54  Polling structure used by em28xx IR's
  55  **********************************************************/
  56
  57 struct em28xx_ir_poll_result {
  58         unsigned int toggle_bit:1;
  59         unsigned int read_count:7;
  60         u8 rc_address;
  61         u8 rc_data[4]; /* 1 byte on em2860/2880, 4 on em2874 */
  62 };
  63
  64 struct em28xx_IR {
  65         struct em28xx *dev;
  66         struct rc_dev *rc;
  67         char name[32];
  68         char phys[32];
  69
  70         /* poll external decoder */
  71         int polling;
  72         struct delayed_work work;
  73         unsigned int full_code:1;
  74         unsigned int last_readcount;
  75
  76         int  (*get_key)(struct em28xx_IR *, struct em28xx_ir_poll_result *);
  77 };
  78
  79 /**********************************************************
  80  I2C IR based get keycodes - should be used with ir-kbd-i2c
  81  **********************************************************/
  82
  83 static int em28xx_get_key_terratec(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
  84 {
  85         unsigned char b;
  86
  87         /* poll IR chip */
  88         if (1 != i2c_master_recv(ir->c, &b, 1)) {
  89                 i2cdprintk("read error\n");
  90                 return -EIO;
  91         }
  92
  93         /* it seems that 0xFE indicates that a button is still hold
  94            down, while 0xff indicates that no button is hold
  95            down. 0xfe sequences are sometimes interrupted by 0xFF */
  96
  97         i2cdprintk("key %02x\n", b);
  98
  99         if (b == 0xff)
 100                 return 0;
 101
 102         if (b == 0xfe)
 103                 /* keep old data */
 104                 return 1;
 105
 106         *ir_key = b;
 107         *ir_raw = b;
 108         return 1;
 109 }
 110
 111 static int em28xx_get_key_em_haup(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
 112 {
 113         unsigned char buf[2];
 114         u16 code;
 115         int size;
 116
 117         /* poll IR chip */
 118         size = i2c_master_recv(ir->c, buf, sizeof(buf));
 119
 120         if (size != 2)
 121                 return -EIO;
 122
 123         /* Does eliminate repeated parity code */
 124         if (buf[1] == 0xff)
 125                 return 0;
 126
 127         ir->old = buf[1];
 128
 129         /*
 130          * Rearranges bits to the right order.
 131          * The bit order were determined experimentally by using
 132          * The original Hauppauge Grey IR and another RC5 that uses addr=0x08
 133          * The RC5 code has 14 bits, but we've experimentally determined
 134          * the meaning for only 11 bits.
 135          * So, the code translation is not complete. Yet, it is enough to
 136          * work with the provided RC5 IR.
 137          */
 138         code =
 139                  ((buf[0] & 0x01) ? 0x0020 : 0) | /*            0010 0000 */
 140                  ((buf[0] & 0x02) ? 0x0010 : 0) | /*            0001 0000 */
 141                  ((buf[0] & 0x04) ? 0x0008 : 0) | /*            0000 1000 */
 142                  ((buf[0] & 0x08) ? 0x0004 : 0) | /*            0000 0100 */
 143                  ((buf[0] & 0x10) ? 0x0002 : 0) | /*            0000 0010 */
 144                  ((buf[0] & 0x20) ? 0x0001 : 0) | /*            0000 0001 */
 145                  ((buf[1] & 0x08) ? 0x1000 : 0) | /* 0001 0000            */
 146                  ((buf[1] & 0x10) ? 0x0800 : 0) | /* 0000 1000            */
 147                  ((buf[1] & 0x20) ? 0x0400 : 0) | /* 0000 0100            */
 148                  ((buf[1] & 0x40) ? 0x0200 : 0) | /* 0000 0010            */
 149                  ((buf[1] & 0x80) ? 0x0100 : 0);  /* 0000 0001            */
 150
 151         i2cdprintk("ir hauppauge (em2840): code=0x%02x (rcv=0x%02x%02x)\n",
 152                         code, buf[1], buf[0]);
 153
 154         /* return key */
 155         *ir_key = code;
 156         *ir_raw = code;
 157         return 1;
 158 }
 159
 160 static int em28xx_get_key_pinnacle_usb_grey(struct IR_i2c *ir, u32 *ir_key,
 161                                      u32 *ir_raw)
 162 {
 163         unsigned char buf[3];
 164
 165         /* poll IR chip */
 166
 167         if (3 != i2c_master_recv(ir->c, buf, 3)) {
 168                 i2cdprintk("read error\n");
 169                 return -EIO;
 170         }
 171
 172         i2cdprintk("key %02x\n", buf[2]&0x3f);
 173         if (buf[0] != 0x00)
 174                 return 0;
 175
 176         *ir_key = buf[2]&0x3f;
 177         *ir_raw = buf[2]&0x3f;
 178
 179         return 1;
 180 }
 181
 182 static int em28xx_get_key_winfast_usbii_deluxe(struct IR_i2c *ir, u32 *ir_key,
 183                                         u32 *ir_raw)
 184 {
 185         unsigned char subaddr, keydetect, key;
 186
 187         struct i2c_msg msg[] = { { .addr = ir->c->addr, .flags = 0, .buf = &subaddr, .len = 1},
 188
 189                                 { .addr = ir->c->addr, .flags = I2C_M_RD, .buf = &keydetect, .len = 1} };
 190
 191         subaddr = 0x10;
 192         if (2 != i2c_transfer(ir->c->adapter, msg, 2)) {
 193                 i2cdprintk("read error\n");
 194                 return -EIO;
 195         }
 196         if (keydetect == 0x00)
 197                 return 0;
 198
 199         subaddr = 0x00;
 200         msg[1].buf = &key;
 201         if (2 != i2c_transfer(ir->c->adapter, msg, 2)) {
 202                 i2cdprintk("read error\n");
 203         return -EIO;
 204         }
 205         if (key == 0x00)
 206                 return 0;
 207
 208         *ir_key = key;
 209         *ir_raw = key;
 210         return 1;
 211 }
 212
 213 /**********************************************************
 214  Poll based get keycode functions
 215  **********************************************************/
 216
 217 /* This is for the em2860/em2880 */
 218 static int default_polling_getkey(struct em28xx_IR *ir,
 219                                   struct em28xx_ir_poll_result *poll_result)
 220 {
 221         struct em28xx *dev = ir->dev;
 222         int rc;
 223         u8 msg[3] = { 0, 0, 0 };
 224
 225         /* Read key toggle, brand, and key code
 226            on registers 0x45, 0x46 and 0x47
 227          */
 228         rc = dev->em28xx_read_reg_req_len(dev, 0, EM28XX_R45_IR,
 229                                           msg, sizeof(msg));
 230         if (rc < 0)
 231                 return rc;
 232
 233         /* Infrared toggle (Reg 0x45[7]) */
 234         poll_result->toggle_bit = (msg[0] >> 7);
 235
 236         /* Infrared read count (Reg 0x45[6:0] */
 237         poll_result->read_count = (msg[0] & 0x7f);
 238
 239         /* Remote Control Address (Reg 0x46) */
 240         poll_result->rc_address = msg[1];
 241
 242         /* Remote Control Data (Reg 0x47) */
 243         poll_result->rc_data[0] = msg[2];
 244
 245         return 0;
 246 }
 247
 248 static int em2874_polling_getkey(struct em28xx_IR *ir,
 249                                  struct em28xx_ir_poll_result *poll_result)
 250 {
 251         struct em28xx *dev = ir->dev;
 252         int rc;
 253         u8 msg[5] = { 0, 0, 0, 0, 0 };
 254
 255         /* Read key toggle, brand, and key code
 256            on registers 0x51-55
 257          */
 258         rc = dev->em28xx_read_reg_req_len(dev, 0, EM2874_R51_IR,
 259                                           msg, sizeof(msg));
 260         if (rc < 0)
 261                 return rc;
 262
 263         /* Infrared toggle (Reg 0x51[7]) */
 264         poll_result->toggle_bit = (msg[0] >> 7);
 265
 266         /* Infrared read count (Reg 0x51[6:0] */
 267         poll_result->read_count = (msg[0] & 0x7f);
 268
 269         /* Remote Control Address (Reg 0x52) */
 270         poll_result->rc_address = msg[1];
 271
 272         /* Remote Control Data (Reg 0x53-55) */
 273         poll_result->rc_data[0] = msg[2];
 274         poll_result->rc_data[1] = msg[3];
 275         poll_result->rc_data[2] = msg[4];
 276
 277         return 0;
 278 }
 279
 280 /**********************************************************
 281  Polling code for em28xx
 282  **********************************************************/
 283
 284 static void em28xx_ir_handle_key(struct em28xx_IR *ir)
 285 {
 286         int result;
 287         struct em28xx_ir_poll_result poll_result;
 288
 289         /* read the registers containing the IR status */
 290         result = ir->get_key(ir, &poll_result);
 291         if (unlikely(result < 0)) {
 292                 dprintk("ir->get_key() failed %d\n", result);
 293                 return;
 294         }
 295
 296         if (unlikely(poll_result.read_count != ir->last_readcount)) {
 297                 dprintk("%s: toggle: %d, count: %d, key 0x%02x%02x\n", __func__,
 298                         poll_result.toggle_bit, poll_result.read_count,
 299                         poll_result.rc_address, poll_result.rc_data[0]);
 300                 if (ir->full_code)
 301                         rc_keydown(ir->rc,
 302                                    poll_result.rc_address << 8 |
 303                                    poll_result.rc_data[0],
 304                                    poll_result.toggle_bit);
 305                 else
 306                         rc_keydown(ir->rc,
 307                                    poll_result.rc_data[0],
 308                                    poll_result.toggle_bit);
 309
 310                 if (ir->dev->chip_id == CHIP_ID_EM2874 ||
 311                     ir->dev->chip_id == CHIP_ID_EM2884)
 312                         /* The em2874 clears the readcount field every time the
 313                            register is read.  The em2860/2880 datasheet says that it
 314                            is supposed to clear the readcount, but it doesn't.  So with
 315                            the em2874, we are looking for a non-zero read count as
 316                            opposed to a readcount that is incrementing */
 317                         ir->last_readcount = 0;
 318                 else
 319                         ir->last_readcount = poll_result.read_count;
 320         }
 321 }
 322
 323 static void em28xx_ir_work(struct work_struct *work)
 324 {
 325         struct em28xx_IR *ir = container_of(work, struct em28xx_IR, work.work);
 326
 327         em28xx_ir_handle_key(ir);
 328         schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling));
 329 }
 330
 331 static int em28xx_ir_start(struct rc_dev *rc)
 332 {
 333         struct em28xx_IR *ir = rc->priv;
 334
 335         INIT_DELAYED_WORK(&ir->work, em28xx_ir_work);
 336         schedule_delayed_work(&ir->work, 0);
 337
 338         return 0;
 339 }
 340
 341 static void em28xx_ir_stop(struct rc_dev *rc)
 342 {
 343         struct em28xx_IR *ir = rc->priv;
 344
 345         cancel_delayed_work_sync(&ir->work);
 346 }
 347
 348 static int em28xx_ir_change_protocol(struct rc_dev *rc_dev, u64 *rc_type)
 349 {
 350         int rc = 0;
 351         struct em28xx_IR *ir = rc_dev->priv;
 352         struct em28xx *dev = ir->dev;
 353         u8 ir_config = EM2874_IR_RC5;
 354
 355         /* Adjust xclk based o IR table for RC5/NEC tables */
 356
 357         if (*rc_type & RC_BIT_RC5) {
 358                 dev->board.xclk |= EM28XX_XCLK_IR_RC5_MODE;
 359                 ir->full_code = 1;
 360                 *rc_type = RC_BIT_RC5;
 361         } else if (*rc_type & RC_BIT_NEC) {
 362                 dev->board.xclk &= ~EM28XX_XCLK_IR_RC5_MODE;
 363                 ir_config = EM2874_IR_NEC;
 364                 ir->full_code = 1;
 365                 *rc_type = RC_BIT_NEC;
 366         } else if (*rc_type != RC_BIT_UNKNOWN)
 367                 rc = -EINVAL;
 368
 369         em28xx_write_reg_bits(dev, EM28XX_R0F_XCLK, dev->board.xclk,
 370                               EM28XX_XCLK_IR_RC5_MODE);
 371
 372         /* Setup the proper handler based on the chip */
 373         switch (dev->chip_id) {
 374         case CHIP_ID_EM2860:
 375         case CHIP_ID_EM2883:
 376                 ir->get_key = default_polling_getkey;
 377                 break;
 378         case CHIP_ID_EM2884:
 379         case CHIP_ID_EM2874:
 380         case CHIP_ID_EM28174:
 381                 ir->get_key = em2874_polling_getkey;
 382                 em28xx_write_regs(dev, EM2874_R50_IR_CONFIG, &ir_config, 1);
 383                 break;
 384         default:
 385                 printk("Unrecognized em28xx chip id 0x%02x: IR not supported\n",
 386                         dev->chip_id);
 387                 rc = -EINVAL;
 388         }
 389
 390         return rc;
 391 }
 392
 393 static void em28xx_register_i2c_ir(struct em28xx *dev)
 394 {
 395         /* Leadtek winfast tv USBII deluxe can find a non working IR-device */
 396         /* at address 0x18, so if that address is needed for another board in */
 397         /* the future, please put it after 0x1f. */
 398         struct i2c_board_info info;
 399         const unsigned short addr_list[] = {
 400                  0x1f, 0x30, 0x47, I2C_CLIENT_END
 401         };
 402
 403         memset(&info, 0, sizeof(struct i2c_board_info));
 404         memset(&dev->init_data, 0, sizeof(dev->init_data));
 405         strlcpy(info.type, "ir_video", I2C_NAME_SIZE);
 406
 407         /* detect & configure */
 408         switch (dev->model) {
 409         case EM2800_BOARD_TERRATEC_CINERGY_200:
 410         case EM2820_BOARD_TERRATEC_CINERGY_250:
 411                 dev->init_data.ir_codes = RC_MAP_EM_TERRATEC;
 412                 dev->init_data.get_key = em28xx_get_key_terratec;
 413                 dev->init_data.name = "i2c IR (EM28XX Terratec)";
 414                 break;
 415         case EM2820_BOARD_PINNACLE_USB_2:
 416                 dev->init_data.ir_codes = RC_MAP_PINNACLE_GREY;
 417                 dev->init_data.get_key = em28xx_get_key_pinnacle_usb_grey;
 418                 dev->init_data.name = "i2c IR (EM28XX Pinnacle PCTV)";
 419                 break;
 420         case EM2820_BOARD_HAUPPAUGE_WINTV_USB_2:
 421                 dev->init_data.ir_codes = RC_MAP_HAUPPAUGE;
 422                 dev->init_data.get_key = em28xx_get_key_em_haup;
 423                 dev->init_data.name = "i2c IR (EM2840 Hauppauge)";
 424                 break;
 425         case EM2820_BOARD_LEADTEK_WINFAST_USBII_DELUXE:
 426                 dev->init_data.ir_codes = RC_MAP_WINFAST_USBII_DELUXE;
 427                 dev->init_data.get_key = em28xx_get_key_winfast_usbii_deluxe;
 428                 dev->init_data.name = "i2c IR (EM2820 Winfast TV USBII Deluxe)";
 429                 break;
 430         }
 431
 432         if (dev->init_data.name)
 433                 info.platform_data = &dev->init_data;
 434         i2c_new_probed_device(&dev->i2c_adap, &info, addr_list, NULL);
 435 }
 436
 437 /**********************************************************
 438  Handle Webcam snapshot button
 439  **********************************************************/
 440
 441 static void em28xx_query_sbutton(struct work_struct *work)
 442 {
 443         /* Poll the register and see if the button is depressed */
 444         struct em28xx *dev =
 445                 container_of(work, struct em28xx, sbutton_query_work.work);
 446         int ret;
 447
 448         ret = em28xx_read_reg(dev, EM28XX_R0C_USBSUSP);
 449
 450         if (ret & EM28XX_R0C_USBSUSP_SNAPSHOT) {
 451                 u8 cleared;
 452                 /* Button is depressed, clear the register */
 453                 cleared = ((u8) ret) & ~EM28XX_R0C_USBSUSP_SNAPSHOT;
 454                 em28xx_write_regs(dev, EM28XX_R0C_USBSUSP, &cleared, 1);
 455
 456                 /* Not emulate the keypress */
 457                 input_report_key(dev->sbutton_input_dev, EM28XX_SNAPSHOT_KEY,
 458                                  1);
 459                 /* Now unpress the key */
 460                 input_report_key(dev->sbutton_input_dev, EM28XX_SNAPSHOT_KEY,
 461                                  0);
 462         }
 463
 464         /* Schedule next poll */
 465         schedule_delayed_work(&dev->sbutton_query_work,
 466                               msecs_to_jiffies(EM28XX_SBUTTON_QUERY_INTERVAL));
 467 }
 468
 469 static void em28xx_register_snapshot_button(struct em28xx *dev)
 470 {
 471         struct input_dev *input_dev;
 472         int err;
 473
 474         em28xx_info("Registering snapshot button...\n");
 475         input_dev = input_allocate_device();
 476         if (!input_dev) {
 477                 em28xx_errdev("input_allocate_device failed\n");
 478                 return;
 479         }
 480
 481         usb_make_path(dev->udev, dev->snapshot_button_path,
 482                       sizeof(dev->snapshot_button_path));
 483         strlcat(dev->snapshot_button_path, "/sbutton",
 484                 sizeof(dev->snapshot_button_path));
 485         INIT_DELAYED_WORK(&dev->sbutton_query_work, em28xx_query_sbutton);
 486
 487         input_dev->name = "em28xx snapshot button";
 488         input_dev->phys = dev->snapshot_button_path;
 489         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
 490         set_bit(EM28XX_SNAPSHOT_KEY, input_dev->keybit);
 491         input_dev->keycodesize = 0;
 492         input_dev->keycodemax = 0;
 493         input_dev->id.bustype = BUS_USB;
 494         input_dev->id.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
 495         input_dev->id.product = le16_to_cpu(dev->udev->descriptor.idProduct);
 496         input_dev->id.version = 1;
 497         input_dev->dev.parent = &dev->udev->dev;
 498
 499         err = input_register_device(input_dev);
 500         if (err) {
 501                 em28xx_errdev("input_register_device failed\n");
 502                 input_free_device(input_dev);
 503                 return;
 504         }
 505
 506         dev->sbutton_input_dev = input_dev;
 507         schedule_delayed_work(&dev->sbutton_query_work,
 508                               msecs_to_jiffies(EM28XX_SBUTTON_QUERY_INTERVAL));
 509         return;
 510
 511 }
 512
 513 static void em28xx_deregister_snapshot_button(struct em28xx *dev)
 514 {
 515         if (dev->sbutton_input_dev != NULL) {
 516                 em28xx_info("Deregistering snapshot button\n");
 517                 cancel_delayed_work_sync(&dev->sbutton_query_work);
 518                 input_unregister_device(dev->sbutton_input_dev);
 519                 dev->sbutton_input_dev = NULL;
 520         }
 521         return;
 522 }
 523
 524 static int em28xx_ir_init(struct em28xx *dev)
 525 {
 526         struct em28xx_IR *ir;
 527         struct rc_dev *rc;
 528         int err = -ENOMEM;
 529         u64 rc_type;
 530
 531         if (dev->board.ir_codes == NULL) {
 532                 /* No remote control support */
 533                 em28xx_warn("Remote control support is not available for "
 534                                 "this card.\n");
 535                 return 0;
 536         }
 537
 538         ir = kzalloc(sizeof(*ir), GFP_KERNEL);
 539         rc = rc_allocate_device();
 540         if (!ir || !rc)
 541                 goto err_out_free;
 542
 543         /* record handles to ourself */
 544         ir->dev = dev;
 545         dev->ir = ir;
 546         ir->rc = rc;
 547
 548         /*
 549          * em2874 supports more protocols. For now, let's just announce
 550          * the two protocols that were already tested
 551          */
 552         rc->allowed_protos = RC_BIT_RC5 | RC_BIT_NEC;
 553         rc->priv = ir;
 554         rc->change_protocol = em28xx_ir_change_protocol;
 555         rc->open = em28xx_ir_start;
 556         rc->close = em28xx_ir_stop;
 557
 558         /* By default, keep protocol field untouched */
 559         rc_type = RC_BIT_UNKNOWN;
 560         err = em28xx_ir_change_protocol(rc, &rc_type);
 561         if (err)
 562                 goto err_out_free;
 563
 564         /* This is how often we ask the chip for IR information */
 565         ir->polling = 100; /* ms */
 566
 567         /* init input device */
 568         snprintf(ir->name, sizeof(ir->name), "em28xx IR (%s)",
 569                                                 dev->name);
 570
 571         usb_make_path(dev->udev, ir->phys, sizeof(ir->phys));
 572         strlcat(ir->phys, "/input0", sizeof(ir->phys));
 573
 574         rc->input_name = ir->name;
 575         rc->input_phys = ir->phys;
 576         rc->input_id.bustype = BUS_USB;
 577         rc->input_id.version = 1;
 578         rc->input_id.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
 579         rc->input_id.product = le16_to_cpu(dev->udev->descriptor.idProduct);
 580         rc->dev.parent = &dev->udev->dev;
 581         rc->map_name = dev->board.ir_codes;
 582         rc->driver_name = MODULE_NAME;
 583
 584         /* all done */
 585         err = rc_register_device(rc);
 586         if (err)
 587                 goto err_out_stop;
 588
 589         em28xx_register_i2c_ir(dev);
 590
 591 #if defined(CONFIG_MODULES) && defined(MODULE)
 592         if (dev->board.has_ir_i2c)
 593                 request_module("ir-kbd-i2c");
 594 #endif
 595         if (dev->board.has_snapshot_button)
 596                 em28xx_register_snapshot_button(dev);
 597
 598         return 0;
 599
 600  err_out_stop:
 601         dev->ir = NULL;
 602  err_out_free:
 603         rc_free_device(rc);
 604         kfree(ir);
 605         return err;
 606 }
 607
 608 static int em28xx_ir_fini(struct em28xx *dev)
 609 {
 610         struct em28xx_IR *ir = dev->ir;
 611
 612         em28xx_deregister_snapshot_button(dev);
 613
 614         /* skip detach on non attached boards */
 615         if (!ir)
 616                 return 0;
 617
 618         if (ir->rc)
 619                 rc_unregister_device(ir->rc);
 620
 621         /* done */
 622         kfree(ir);
 623         dev->ir = NULL;
 624         return 0;
 625 }
 626
 627 static struct em28xx_ops rc_ops = {
 628         .id   = EM28XX_RC,
 629         .name = "Em28xx Input Extension",
 630         .init = em28xx_ir_init,
 631         .fini = em28xx_ir_fini,
 632 };
 633
 634 static int __init em28xx_rc_register(void)
 635 {
 636         return em28xx_register_extension(&rc_ops);
 637 }
 638
 639 static void __exit em28xx_rc_unregister(void)
 640 {
 641         em28xx_unregister_extension(&rc_ops);
 642 }
 643
 644 MODULE_LICENSE("GPL");
 645 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@redhat.com>");
 646 MODULE_DESCRIPTION("Em28xx Input driver");
 647
 648 module_init(em28xx_rc_register);
 649 module_exit(em28xx_rc_unregister);