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 dprintk(fmt, arg...) \
  44         if (ir_debug) { \
  45                 printk(KERN_DEBUG "%s/ir: " fmt, ir->name , ## arg); \
  46         }
  47
  48 /**********************************************************
  49  Polling structure used by em28xx IR's
  50  **********************************************************/
  51
  52 struct em28xx_ir_poll_result {
  53         unsigned int toggle_bit:1;
  54         unsigned int read_count:7;
  55
  56         u32 scancode;
  57 };
  58
  59 struct em28xx_IR {
  60         struct em28xx *dev;
  61         struct rc_dev *rc;
  62         char name[32];
  63         char phys[32];
  64
  65         /* poll decoder */
  66         int polling;
  67         struct delayed_work work;
  68         unsigned int full_code:1;
  69         unsigned int last_readcount;
  70         u64 rc_type;
  71
  72         /* external device (if used) */
  73         struct i2c_client *i2c_dev;
  74
  75         int  (*get_key_i2c)(struct i2c_client *, u32 *, u32 *);
  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 i2c_client *i2c_dev,
  84                                    u32 *ir_key, u32 *ir_raw)
  85 {
  86         unsigned char b;
  87
  88         /* poll IR chip */
  89         if (1 != i2c_master_recv(i2c_dev, &b, 1))
  90                 return -EIO;
  91
  92         /* it seems that 0xFE indicates that a button is still hold
  93            down, while 0xff indicates that no button is hold
  94            down. 0xfe sequences are sometimes interrupted by 0xFF */
  95
  96         if (b == 0xff)
  97                 return 0;
  98
  99         if (b == 0xfe)
 100                 /* keep old data */
 101                 return 1;
 102
 103         *ir_key = b;
 104         *ir_raw = b;
 105         return 1;
 106 }
 107
 108 static int em28xx_get_key_em_haup(struct i2c_client *i2c_dev,
 109                                   u32 *ir_key, u32 *ir_raw)
 110 {
 111         unsigned char buf[2];
 112         u16 code;
 113         int size;
 114
 115         /* poll IR chip */
 116         size = i2c_master_recv(i2c_dev, buf, sizeof(buf));
 117
 118         if (size != 2)
 119                 return -EIO;
 120
 121         /* Does eliminate repeated parity code */
 122         if (buf[1] == 0xff)
 123                 return 0;
 124
 125         /*
 126          * Rearranges bits to the right order.
 127          * The bit order were determined experimentally by using
 128          * The original Hauppauge Grey IR and another RC5 that uses addr=0x08
 129          * The RC5 code has 14 bits, but we've experimentally determined
 130          * the meaning for only 11 bits.
 131          * So, the code translation is not complete. Yet, it is enough to
 132          * work with the provided RC5 IR.
 133          */
 134         code =
 135                  ((buf[0] & 0x01) ? 0x0020 : 0) | /*            0010 0000 */
 136                  ((buf[0] & 0x02) ? 0x0010 : 0) | /*            0001 0000 */
 137                  ((buf[0] & 0x04) ? 0x0008 : 0) | /*            0000 1000 */
 138                  ((buf[0] & 0x08) ? 0x0004 : 0) | /*            0000 0100 */
 139                  ((buf[0] & 0x10) ? 0x0002 : 0) | /*            0000 0010 */
 140                  ((buf[0] & 0x20) ? 0x0001 : 0) | /*            0000 0001 */
 141                  ((buf[1] & 0x08) ? 0x1000 : 0) | /* 0001 0000            */
 142                  ((buf[1] & 0x10) ? 0x0800 : 0) | /* 0000 1000            */
 143                  ((buf[1] & 0x20) ? 0x0400 : 0) | /* 0000 0100            */
 144                  ((buf[1] & 0x40) ? 0x0200 : 0) | /* 0000 0010            */
 145                  ((buf[1] & 0x80) ? 0x0100 : 0);  /* 0000 0001            */
 146
 147         /* return key */
 148         *ir_key = code;
 149         *ir_raw = code;
 150         return 1;
 151 }
 152
 153 static int em28xx_get_key_pinnacle_usb_grey(struct i2c_client *i2c_dev,
 154                                             u32 *ir_key, u32 *ir_raw)
 155 {
 156         unsigned char buf[3];
 157
 158         /* poll IR chip */
 159
 160         if (3 != i2c_master_recv(i2c_dev, buf, 3))
 161                 return -EIO;
 162
 163         if (buf[0] != 0x00)
 164                 return 0;
 165
 166         *ir_key = buf[2]&0x3f;
 167         *ir_raw = buf[2]&0x3f;
 168
 169         return 1;
 170 }
 171
 172 static int em28xx_get_key_winfast_usbii_deluxe(struct i2c_client *i2c_dev,
 173                                                u32 *ir_key, u32 *ir_raw)
 174 {
 175         unsigned char subaddr, keydetect, key;
 176
 177         struct i2c_msg msg[] = { { .addr = i2c_dev->addr, .flags = 0, .buf = &subaddr, .len = 1},
 178
 179                                 { .addr = i2c_dev->addr, .flags = I2C_M_RD, .buf = &keydetect, .len = 1} };
 180
 181         subaddr = 0x10;
 182         if (2 != i2c_transfer(i2c_dev->adapter, msg, 2))
 183                 return -EIO;
 184         if (keydetect == 0x00)
 185                 return 0;
 186
 187         subaddr = 0x00;
 188         msg[1].buf = &key;
 189         if (2 != i2c_transfer(i2c_dev->adapter, msg, 2))
 190                 return -EIO;
 191         if (key == 0x00)
 192                 return 0;
 193
 194         *ir_key = key;
 195         *ir_raw = key;
 196         return 1;
 197 }
 198
 199 /**********************************************************
 200  Poll based get keycode functions
 201  **********************************************************/
 202
 203 /* This is for the em2860/em2880 */
 204 static int default_polling_getkey(struct em28xx_IR *ir,
 205                                   struct em28xx_ir_poll_result *poll_result)
 206 {
 207         struct em28xx *dev = ir->dev;
 208         int rc;
 209         u8 msg[3] = { 0, 0, 0 };
 210
 211         /* Read key toggle, brand, and key code
 212            on registers 0x45, 0x46 and 0x47
 213          */
 214         rc = dev->em28xx_read_reg_req_len(dev, 0, EM28XX_R45_IR,
 215                                           msg, sizeof(msg));
 216         if (rc < 0)
 217                 return rc;
 218
 219         /* Infrared toggle (Reg 0x45[7]) */
 220         poll_result->toggle_bit = (msg[0] >> 7);
 221
 222         /* Infrared read count (Reg 0x45[6:0] */
 223         poll_result->read_count = (msg[0] & 0x7f);
 224
 225         /* Remote Control Address/Data (Regs 0x46/0x47) */
 226         poll_result->scancode = msg[1] << 8 | msg[2];
 227
 228         return 0;
 229 }
 230
 231 static int em2874_polling_getkey(struct em28xx_IR *ir,
 232                                  struct em28xx_ir_poll_result *poll_result)
 233 {
 234         struct em28xx *dev = ir->dev;
 235         int rc;
 236         u8 msg[5] = { 0, 0, 0, 0, 0 };
 237
 238         /* Read key toggle, brand, and key code
 239            on registers 0x51-55
 240          */
 241         rc = dev->em28xx_read_reg_req_len(dev, 0, EM2874_R51_IR,
 242                                           msg, sizeof(msg));
 243         if (rc < 0)
 244                 return rc;
 245
 246         /* Infrared toggle (Reg 0x51[7]) */
 247         poll_result->toggle_bit = (msg[0] >> 7);
 248
 249         /* Infrared read count (Reg 0x51[6:0] */
 250         poll_result->read_count = (msg[0] & 0x7f);
 251
 252         /*
 253          * Remote Control Address (Reg 0x52)
 254          * Remote Control Data (Reg 0x53-0x55)
 255          */
 256         switch (ir->rc_type) {
 257         case RC_BIT_RC5:
 258                 poll_result->scancode = msg[1] << 8 | msg[2];
 259                 break;
 260         case RC_BIT_NEC:
 261                 if ((msg[3] ^ msg[4]) != 0xff)          /* 32 bits NEC */
 262                         poll_result->scancode = (msg[1] << 24) |
 263                                                 (msg[2] << 16) |
 264                                                 (msg[3] << 8)  |
 265                                                  msg[4];
 266                 else if ((msg[1] ^ msg[2]) != 0xff)     /* 24 bits NEC */
 267                         poll_result->scancode = (msg[1] << 16) |
 268                                                 (msg[2] << 8)  |
 269                                                  msg[3];
 270                 else                                    /* Normal NEC */
 271                         poll_result->scancode = msg[1] << 8 | msg[3];
 272                 break;
 273         case RC_BIT_RC6_0:
 274                 poll_result->scancode = msg[1] << 8 | msg[2];
 275                 break;
 276         default:
 277                 poll_result->scancode = (msg[1] << 24) | (msg[2] << 16) |
 278                                         (msg[3] << 8)  | msg[4];
 279                 break;
 280         }
 281
 282         return 0;
 283 }
 284
 285 /**********************************************************
 286  Polling code for em28xx
 287  **********************************************************/
 288
 289 static int em28xx_i2c_ir_handle_key(struct em28xx_IR *ir)
 290 {
 291         static u32 ir_key, ir_raw;
 292         int rc;
 293
 294         rc = ir->get_key_i2c(ir->i2c_dev, &ir_key, &ir_raw);
 295         if (rc < 0) {
 296                 dprintk("ir->get_key_i2c() failed: %d\n", rc);
 297                 return rc;
 298         }
 299
 300         if (rc) {
 301                 dprintk("%s: keycode = 0x%04x\n", __func__, ir_key);
 302                 rc_keydown(ir->rc, ir_key, 0);
 303         }
 304         return 0;
 305 }
 306
 307 static void em28xx_ir_handle_key(struct em28xx_IR *ir)
 308 {
 309         int result;
 310         struct em28xx_ir_poll_result poll_result;
 311
 312         /* read the registers containing the IR status */
 313         result = ir->get_key(ir, &poll_result);
 314         if (unlikely(result < 0)) {
 315                 dprintk("ir->get_key() failed: %d\n", result);
 316                 return;
 317         }
 318
 319         if (unlikely(poll_result.read_count != ir->last_readcount)) {
 320                 dprintk("%s: toggle: %d, count: %d, key 0x%04x\n", __func__,
 321                         poll_result.toggle_bit, poll_result.read_count,
 322                         poll_result.scancode);
 323                 if (ir->full_code)
 324                         rc_keydown(ir->rc,
 325                                    poll_result.scancode,
 326                                    poll_result.toggle_bit);
 327                 else
 328                         rc_keydown(ir->rc,
 329                                    poll_result.scancode & 0xff,
 330                                    poll_result.toggle_bit);
 331
 332                 if (ir->dev->chip_id == CHIP_ID_EM2874 ||
 333                     ir->dev->chip_id == CHIP_ID_EM2884)
 334                         /* The em2874 clears the readcount field every time the
 335                            register is read.  The em2860/2880 datasheet says that it
 336                            is supposed to clear the readcount, but it doesn't.  So with
 337                            the em2874, we are looking for a non-zero read count as
 338                            opposed to a readcount that is incrementing */
 339                         ir->last_readcount = 0;
 340                 else
 341                         ir->last_readcount = poll_result.read_count;
 342         }
 343 }
 344
 345 static void em28xx_i2c_ir_work(struct work_struct *work)
 346 {
 347         struct em28xx_IR *ir = container_of(work, struct em28xx_IR, work.work);
 348
 349         em28xx_i2c_ir_handle_key(ir);
 350         schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling));
 351 }
 352
 353 static void em28xx_ir_work(struct work_struct *work)
 354 {
 355         struct em28xx_IR *ir = container_of(work, struct em28xx_IR, work.work);
 356
 357         em28xx_ir_handle_key(ir);
 358         schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling));
 359 }
 360
 361 static int em28xx_ir_start(struct rc_dev *rc)
 362 {
 363         struct em28xx_IR *ir = rc->priv;
 364
 365         if (ir->i2c_dev) /* external i2c device */
 366                 INIT_DELAYED_WORK(&ir->work, em28xx_i2c_ir_work);
 367         else /* internal device */
 368                 INIT_DELAYED_WORK(&ir->work, em28xx_ir_work);
 369         schedule_delayed_work(&ir->work, 0);
 370
 371         return 0;
 372 }
 373
 374 static void em28xx_ir_stop(struct rc_dev *rc)
 375 {
 376         struct em28xx_IR *ir = rc->priv;
 377
 378         cancel_delayed_work_sync(&ir->work);
 379 }
 380
 381 static int em2860_ir_change_protocol(struct rc_dev *rc_dev, u64 *rc_type)
 382 {
 383         struct em28xx_IR *ir = rc_dev->priv;
 384         struct em28xx *dev = ir->dev;
 385
 386         /* Adjust xclk based on IR table for RC5/NEC tables */
 387         if (*rc_type & RC_BIT_RC5) {
 388                 dev->board.xclk |= EM28XX_XCLK_IR_RC5_MODE;
 389                 ir->full_code = 1;
 390                 *rc_type = RC_BIT_RC5;
 391         } else if (*rc_type & RC_BIT_NEC) {
 392                 dev->board.xclk &= ~EM28XX_XCLK_IR_RC5_MODE;
 393                 ir->full_code = 1;
 394                 *rc_type = RC_BIT_NEC;
 395         } else if (*rc_type & RC_BIT_UNKNOWN) {
 396                 *rc_type = RC_BIT_UNKNOWN;
 397         } else {
 398                 *rc_type = ir->rc_type;
 399                 return -EINVAL;
 400         }
 401         em28xx_write_reg_bits(dev, EM28XX_R0F_XCLK, dev->board.xclk,
 402                               EM28XX_XCLK_IR_RC5_MODE);
 403
 404         ir->rc_type = *rc_type;
 405
 406         return 0;
 407 }
 408
 409 static int em2874_ir_change_protocol(struct rc_dev *rc_dev, u64 *rc_type)
 410 {
 411         struct em28xx_IR *ir = rc_dev->priv;
 412         struct em28xx *dev = ir->dev;
 413         u8 ir_config = EM2874_IR_RC5;
 414
 415         /* Adjust xclk and set type based on IR table for RC5/NEC/RC6 tables */
 416         if (*rc_type & RC_BIT_RC5) {
 417                 dev->board.xclk |= EM28XX_XCLK_IR_RC5_MODE;
 418                 ir->full_code = 1;
 419                 *rc_type = RC_BIT_RC5;
 420         } else if (*rc_type & RC_BIT_NEC) {
 421                 dev->board.xclk &= ~EM28XX_XCLK_IR_RC5_MODE;
 422                 ir_config = EM2874_IR_NEC | EM2874_IR_NEC_NO_PARITY;
 423                 ir->full_code = 1;
 424                 *rc_type = RC_BIT_NEC;
 425         } else if (*rc_type & RC_BIT_RC6_0) {
 426                 dev->board.xclk |= EM28XX_XCLK_IR_RC5_MODE;
 427                 ir_config = EM2874_IR_RC6_MODE_0;
 428                 ir->full_code = 1;
 429                 *rc_type = RC_BIT_RC6_0;
 430         } else if (*rc_type & RC_BIT_UNKNOWN) {
 431                 *rc_type = RC_BIT_UNKNOWN;
 432         } else {
 433                 *rc_type = ir->rc_type;
 434                 return -EINVAL;
 435         }
 436         em28xx_write_regs(dev, EM2874_R50_IR_CONFIG, &ir_config, 1);
 437         em28xx_write_reg_bits(dev, EM28XX_R0F_XCLK, dev->board.xclk,
 438                               EM28XX_XCLK_IR_RC5_MODE);
 439
 440         ir->rc_type = *rc_type;
 441
 442         return 0;
 443 }
 444 static int em28xx_ir_change_protocol(struct rc_dev *rc_dev, u64 *rc_type)
 445 {
 446         struct em28xx_IR *ir = rc_dev->priv;
 447         struct em28xx *dev = ir->dev;
 448
 449         /* Setup the proper handler based on the chip */
 450         switch (dev->chip_id) {
 451         case CHIP_ID_EM2860:
 452         case CHIP_ID_EM2883:
 453                 return em2860_ir_change_protocol(rc_dev, rc_type);
 454         case CHIP_ID_EM2884:
 455         case CHIP_ID_EM2874:
 456         case CHIP_ID_EM28174:
 457                 return em2874_ir_change_protocol(rc_dev, rc_type);
 458         default:
 459                 printk("Unrecognized em28xx chip id 0x%02x: IR not supported\n",
 460                         dev->chip_id);
 461                 return -EINVAL;
 462         }
 463 }
 464
 465 static struct i2c_client *em28xx_probe_i2c_ir(struct em28xx *dev)
 466 {
 467         int i = 0;
 468         struct i2c_client *i2c_dev = NULL;
 469         /* Leadtek winfast tv USBII deluxe can find a non working IR-device */
 470         /* at address 0x18, so if that address is needed for another board in */
 471         /* the future, please put it after 0x1f. */
 472         const unsigned short addr_list[] = {
 473                  0x1f, 0x30, 0x47, I2C_CLIENT_END
 474         };
 475
 476         while (addr_list[i] != I2C_CLIENT_END) {
 477                 if (i2c_probe_func_quick_read(&dev->i2c_adap, addr_list[i]) == 1) {
 478                         i2c_dev = kzalloc(sizeof(*i2c_dev), GFP_KERNEL);
 479                         if (i2c_dev)  {
 480                                 i2c_dev->addr = addr_list[i];
 481                                 i2c_dev->adapter = &dev->i2c_adap;
 482                                 /* NOTE: as long as we don't register the device
 483                                  * at the i2c subsystem, no other fields need to
 484                                  * be set up */
 485                         }
 486                         break;
 487                 }
 488                 i++;
 489         }
 490
 491         return i2c_dev;
 492 }
 493
 494 /**********************************************************
 495  Handle Webcam snapshot button
 496  **********************************************************/
 497
 498 static void em28xx_query_sbutton(struct work_struct *work)
 499 {
 500         /* Poll the register and see if the button is depressed */
 501         struct em28xx *dev =
 502                 container_of(work, struct em28xx, sbutton_query_work.work);
 503         int ret;
 504
 505         ret = em28xx_read_reg(dev, EM28XX_R0C_USBSUSP);
 506
 507         if (ret & EM28XX_R0C_USBSUSP_SNAPSHOT) {
 508                 u8 cleared;
 509                 /* Button is depressed, clear the register */
 510                 cleared = ((u8) ret) & ~EM28XX_R0C_USBSUSP_SNAPSHOT;
 511                 em28xx_write_regs(dev, EM28XX_R0C_USBSUSP, &cleared, 1);
 512
 513                 /* Not emulate the keypress */
 514                 input_report_key(dev->sbutton_input_dev, EM28XX_SNAPSHOT_KEY,
 515                                  1);
 516                 /* Now unpress the key */
 517                 input_report_key(dev->sbutton_input_dev, EM28XX_SNAPSHOT_KEY,
 518                                  0);
 519         }
 520
 521         /* Schedule next poll */
 522         schedule_delayed_work(&dev->sbutton_query_work,
 523                               msecs_to_jiffies(EM28XX_SBUTTON_QUERY_INTERVAL));
 524 }
 525
 526 static void em28xx_register_snapshot_button(struct em28xx *dev)
 527 {
 528         struct input_dev *input_dev;
 529         int err;
 530
 531         em28xx_info("Registering snapshot button...\n");
 532         input_dev = input_allocate_device();
 533         if (!input_dev) {
 534                 em28xx_errdev("input_allocate_device failed\n");
 535                 return;
 536         }
 537
 538         usb_make_path(dev->udev, dev->snapshot_button_path,
 539                       sizeof(dev->snapshot_button_path));
 540         strlcat(dev->snapshot_button_path, "/sbutton",
 541                 sizeof(dev->snapshot_button_path));
 542         INIT_DELAYED_WORK(&dev->sbutton_query_work, em28xx_query_sbutton);
 543
 544         input_dev->name = "em28xx snapshot button";
 545         input_dev->phys = dev->snapshot_button_path;
 546         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
 547         set_bit(EM28XX_SNAPSHOT_KEY, input_dev->keybit);
 548         input_dev->keycodesize = 0;
 549         input_dev->keycodemax = 0;
 550         input_dev->id.bustype = BUS_USB;
 551         input_dev->id.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
 552         input_dev->id.product = le16_to_cpu(dev->udev->descriptor.idProduct);
 553         input_dev->id.version = 1;
 554         input_dev->dev.parent = &dev->udev->dev;
 555
 556         err = input_register_device(input_dev);
 557         if (err) {
 558                 em28xx_errdev("input_register_device failed\n");
 559                 input_free_device(input_dev);
 560                 return;
 561         }
 562
 563         dev->sbutton_input_dev = input_dev;
 564         schedule_delayed_work(&dev->sbutton_query_work,
 565                               msecs_to_jiffies(EM28XX_SBUTTON_QUERY_INTERVAL));
 566         return;
 567
 568 }
 569
 570 static void em28xx_deregister_snapshot_button(struct em28xx *dev)
 571 {
 572         if (dev->sbutton_input_dev != NULL) {
 573                 em28xx_info("Deregistering snapshot button\n");
 574                 cancel_delayed_work_sync(&dev->sbutton_query_work);
 575                 input_unregister_device(dev->sbutton_input_dev);
 576                 dev->sbutton_input_dev = NULL;
 577         }
 578         return;
 579 }
 580
 581 static int em28xx_ir_init(struct em28xx *dev)
 582 {
 583         struct em28xx_IR *ir;
 584         struct rc_dev *rc;
 585         int err = -ENOMEM;
 586         u64 rc_type;
 587         struct i2c_client *i2c_rc_dev = NULL;
 588
 589         if (dev->board.has_snapshot_button)
 590                 em28xx_register_snapshot_button(dev);
 591
 592         if (dev->board.has_ir_i2c) {
 593                 i2c_rc_dev = em28xx_probe_i2c_ir(dev);
 594                 if (!i2c_rc_dev) {
 595                         dev->board.has_ir_i2c = 0;
 596                         em28xx_warn("No i2c IR remote control device found.\n");
 597                         return -ENODEV;
 598                 }
 599         }
 600
 601         if (dev->board.ir_codes == NULL && !dev->board.has_ir_i2c) {
 602                 /* No remote control support */
 603                 em28xx_warn("Remote control support is not available for "
 604                                 "this card.\n");
 605                 return 0;
 606         }
 607
 608         ir = kzalloc(sizeof(*ir), GFP_KERNEL);
 609         rc = rc_allocate_device();
 610         if (!ir || !rc)
 611                 goto error;
 612
 613         /* record handles to ourself */
 614         ir->dev = dev;
 615         dev->ir = ir;
 616         ir->rc = rc;
 617
 618         rc->priv = ir;
 619         rc->open = em28xx_ir_start;
 620         rc->close = em28xx_ir_stop;
 621
 622         if (dev->board.has_ir_i2c) {    /* external i2c device */
 623                 switch (dev->model) {
 624                 case EM2800_BOARD_TERRATEC_CINERGY_200:
 625                 case EM2820_BOARD_TERRATEC_CINERGY_250:
 626                         rc->map_name = RC_MAP_EM_TERRATEC;
 627                         ir->get_key_i2c = em28xx_get_key_terratec;
 628                         break;
 629                 case EM2820_BOARD_PINNACLE_USB_2:
 630                         rc->map_name = RC_MAP_PINNACLE_GREY;
 631                         ir->get_key_i2c = em28xx_get_key_pinnacle_usb_grey;
 632                         break;
 633                 case EM2820_BOARD_HAUPPAUGE_WINTV_USB_2:
 634                         rc->map_name = RC_MAP_HAUPPAUGE;
 635                         ir->get_key_i2c = em28xx_get_key_em_haup;
 636                         rc->allowed_protos = RC_BIT_RC5;
 637                         break;
 638                 case EM2820_BOARD_LEADTEK_WINFAST_USBII_DELUXE:
 639                         rc->map_name = RC_MAP_WINFAST_USBII_DELUXE;
 640                         ir->get_key_i2c = em28xx_get_key_winfast_usbii_deluxe;
 641                         break;
 642                 default:
 643                         err = -ENODEV;
 644                         goto error;
 645                 }
 646
 647                 ir->i2c_dev = i2c_rc_dev;
 648         } else {        /* internal device */
 649                 switch (dev->chip_id) {
 650                 case CHIP_ID_EM2860:
 651                 case CHIP_ID_EM2883:
 652                         rc->allowed_protos = RC_BIT_RC5 | RC_BIT_NEC;
 653                         ir->get_key = default_polling_getkey;
 654                         break;
 655                 case CHIP_ID_EM2884:
 656                 case CHIP_ID_EM2874:
 657                 case CHIP_ID_EM28174:
 658                         ir->get_key = em2874_polling_getkey;
 659                         rc->allowed_protos = RC_BIT_RC5 | RC_BIT_NEC |
 660                                              RC_BIT_RC6_0;
 661                         break;
 662                 default:
 663                         err = -ENODEV;
 664                         goto error;
 665                 }
 666
 667                 rc->change_protocol = em28xx_ir_change_protocol;
 668                 rc->map_name = dev->board.ir_codes;
 669
 670                 /* By default, keep protocol field untouched */
 671                 rc_type = RC_BIT_UNKNOWN;
 672                 err = em28xx_ir_change_protocol(rc, &rc_type);
 673                 if (err)
 674                         goto error;
 675         }
 676
 677         /* This is how often we ask the chip for IR information */
 678         ir->polling = 100; /* ms */
 679
 680         /* init input device */
 681         snprintf(ir->name, sizeof(ir->name), "em28xx IR (%s)", dev->name);
 682
 683         usb_make_path(dev->udev, ir->phys, sizeof(ir->phys));
 684         strlcat(ir->phys, "/input0", sizeof(ir->phys));
 685
 686         rc->input_name = ir->name;
 687         rc->input_phys = ir->phys;
 688         rc->input_id.bustype = BUS_USB;
 689         rc->input_id.version = 1;
 690         rc->input_id.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
 691         rc->input_id.product = le16_to_cpu(dev->udev->descriptor.idProduct);
 692         rc->dev.parent = &dev->udev->dev;
 693         rc->driver_name = MODULE_NAME;
 694
 695         /* all done */
 696         err = rc_register_device(rc);
 697         if (err)
 698                 goto error;
 699
 700         return 0;
 701
 702 error:
 703         if (ir && ir->i2c_dev)
 704                 kfree(ir->i2c_dev);
 705         dev->ir = NULL;
 706         rc_free_device(rc);
 707         kfree(ir);
 708         return err;
 709 }
 710
 711 static int em28xx_ir_fini(struct em28xx *dev)
 712 {
 713         struct em28xx_IR *ir = dev->ir;
 714
 715         em28xx_deregister_snapshot_button(dev);
 716
 717         /* skip detach on non attached boards */
 718         if (!ir)
 719                 return 0;
 720
 721         if (ir->rc)
 722                 rc_unregister_device(ir->rc);
 723
 724         kfree(ir->i2c_dev);
 725
 726         /* done */
 727         kfree(ir);
 728         dev->ir = NULL;
 729         return 0;
 730 }
 731
 732 static struct em28xx_ops rc_ops = {
 733         .id   = EM28XX_RC,
 734         .name = "Em28xx Input Extension",
 735         .init = em28xx_ir_init,
 736         .fini = em28xx_ir_fini,
 737 };
 738
 739 static int __init em28xx_rc_register(void)
 740 {
 741         return em28xx_register_extension(&rc_ops);
 742 }
 743
 744 static void __exit em28xx_rc_unregister(void)
 745 {
 746         em28xx_unregister_extension(&rc_ops);
 747 }
 748
 749 MODULE_LICENSE("GPL");
 750 MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@redhat.com>");
 751 MODULE_DESCRIPTION("Em28xx Input driver");
 752
 753 module_init(em28xx_rc_register);
 754 module_exit(em28xx_rc_unregister);