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_BUTTONS_DEBOUNCED_QUERY_INTERVAL         500 /* [ms] */
  35 #define EM28XX_BUTTONS_VOLATILE_QUERY_INTERVAL          100 /* [ms] */
  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         /* i2c slave address of external device (if used) */
  73         u16 i2c_dev_addr;
  74
  75         int  (*get_key_i2c)(struct i2c_client *, 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, u32 *ir_key)
  84 {
  85         unsigned char b;
  86
  87         /* poll IR chip */
  88         if (1 != i2c_master_recv(i2c_dev, &b, 1))
  89                 return -EIO;
  90
  91         /* it seems that 0xFE indicates that a button is still hold
  92            down, while 0xff indicates that no button is hold down. */
  93
  94         if (b == 0xff)
  95                 return 0;
  96
  97         if (b == 0xfe)
  98                 /* keep old data */
  99                 return 1;
 100
 101         *ir_key = b;
 102         return 1;
 103 }
 104
 105 static int em28xx_get_key_em_haup(struct i2c_client *i2c_dev, u32 *ir_key)
 106 {
 107         unsigned char buf[2];
 108         u16 code;
 109         int size;
 110
 111         /* poll IR chip */
 112         size = i2c_master_recv(i2c_dev, buf, sizeof(buf));
 113
 114         if (size != 2)
 115                 return -EIO;
 116
 117         /* Does eliminate repeated parity code */
 118         if (buf[1] == 0xff)
 119                 return 0;
 120
 121         /*
 122          * Rearranges bits to the right order.
 123          * The bit order were determined experimentally by using
 124          * The original Hauppauge Grey IR and another RC5 that uses addr=0x08
 125          * The RC5 code has 14 bits, but we've experimentally determined
 126          * the meaning for only 11 bits.
 127          * So, the code translation is not complete. Yet, it is enough to
 128          * work with the provided RC5 IR.
 129          */
 130         code =
 131                  ((buf[0] & 0x01) ? 0x0020 : 0) | /*            0010 0000 */
 132                  ((buf[0] & 0x02) ? 0x0010 : 0) | /*            0001 0000 */
 133                  ((buf[0] & 0x04) ? 0x0008 : 0) | /*            0000 1000 */
 134                  ((buf[0] & 0x08) ? 0x0004 : 0) | /*            0000 0100 */
 135                  ((buf[0] & 0x10) ? 0x0002 : 0) | /*            0000 0010 */
 136                  ((buf[0] & 0x20) ? 0x0001 : 0) | /*            0000 0001 */
 137                  ((buf[1] & 0x08) ? 0x1000 : 0) | /* 0001 0000            */
 138                  ((buf[1] & 0x10) ? 0x0800 : 0) | /* 0000 1000            */
 139                  ((buf[1] & 0x20) ? 0x0400 : 0) | /* 0000 0100            */
 140                  ((buf[1] & 0x40) ? 0x0200 : 0) | /* 0000 0010            */
 141                  ((buf[1] & 0x80) ? 0x0100 : 0);  /* 0000 0001            */
 142
 143         /* return key */
 144         *ir_key = code;
 145         return 1;
 146 }
 147
 148 static int em28xx_get_key_pinnacle_usb_grey(struct i2c_client *i2c_dev,
 149                                             u32 *ir_key)
 150 {
 151         unsigned char buf[3];
 152
 153         /* poll IR chip */
 154
 155         if (3 != i2c_master_recv(i2c_dev, buf, 3))
 156                 return -EIO;
 157
 158         if (buf[0] != 0x00)
 159                 return 0;
 160
 161         *ir_key = buf[2]&0x3f;
 162
 163         return 1;
 164 }
 165
 166 static int em28xx_get_key_winfast_usbii_deluxe(struct i2c_client *i2c_dev,
 167                                                u32 *ir_key)
 168 {
 169         unsigned char subaddr, keydetect, key;
 170
 171         struct i2c_msg msg[] = { { .addr = i2c_dev->addr, .flags = 0, .buf = &subaddr, .len = 1},
 172                                  { .addr = i2c_dev->addr, .flags = I2C_M_RD, .buf = &keydetect, .len = 1} };
 173
 174         subaddr = 0x10;
 175         if (2 != i2c_transfer(i2c_dev->adapter, msg, 2))
 176                 return -EIO;
 177         if (keydetect == 0x00)
 178                 return 0;
 179
 180         subaddr = 0x00;
 181         msg[1].buf = &key;
 182         if (2 != i2c_transfer(i2c_dev->adapter, msg, 2))
 183                 return -EIO;
 184         if (key == 0x00)
 185                 return 0;
 186
 187         *ir_key = key;
 188         return 1;
 189 }
 190
 191 /**********************************************************
 192  Poll based get keycode functions
 193  **********************************************************/
 194
 195 /* This is for the em2860/em2880 */
 196 static int default_polling_getkey(struct em28xx_IR *ir,
 197                                   struct em28xx_ir_poll_result *poll_result)
 198 {
 199         struct em28xx *dev = ir->dev;
 200         int rc;
 201         u8 msg[3] = { 0, 0, 0 };
 202
 203         /* Read key toggle, brand, and key code
 204            on registers 0x45, 0x46 and 0x47
 205          */
 206         rc = dev->em28xx_read_reg_req_len(dev, 0, EM28XX_R45_IR,
 207                                           msg, sizeof(msg));
 208         if (rc < 0)
 209                 return rc;
 210
 211         /* Infrared toggle (Reg 0x45[7]) */
 212         poll_result->toggle_bit = (msg[0] >> 7);
 213
 214         /* Infrared read count (Reg 0x45[6:0] */
 215         poll_result->read_count = (msg[0] & 0x7f);
 216
 217         /* Remote Control Address/Data (Regs 0x46/0x47) */
 218         poll_result->scancode = msg[1] << 8 | msg[2];
 219
 220         return 0;
 221 }
 222
 223 static int em2874_polling_getkey(struct em28xx_IR *ir,
 224                                  struct em28xx_ir_poll_result *poll_result)
 225 {
 226         struct em28xx *dev = ir->dev;
 227         int rc;
 228         u8 msg[5] = { 0, 0, 0, 0, 0 };
 229
 230         /* Read key toggle, brand, and key code
 231            on registers 0x51-55
 232          */
 233         rc = dev->em28xx_read_reg_req_len(dev, 0, EM2874_R51_IR,
 234                                           msg, sizeof(msg));
 235         if (rc < 0)
 236                 return rc;
 237
 238         /* Infrared toggle (Reg 0x51[7]) */
 239         poll_result->toggle_bit = (msg[0] >> 7);
 240
 241         /* Infrared read count (Reg 0x51[6:0] */
 242         poll_result->read_count = (msg[0] & 0x7f);
 243
 244         /*
 245          * Remote Control Address (Reg 0x52)
 246          * Remote Control Data (Reg 0x53-0x55)
 247          */
 248         switch (ir->rc_type) {
 249         case RC_BIT_RC5:
 250                 poll_result->scancode = msg[1] << 8 | msg[2];
 251                 break;
 252         case RC_BIT_NEC:
 253                 if ((msg[3] ^ msg[4]) != 0xff)          /* 32 bits NEC */
 254                         poll_result->scancode = (msg[1] << 24) |
 255                                                 (msg[2] << 16) |
 256                                                 (msg[3] << 8)  |
 257                                                  msg[4];
 258                 else if ((msg[1] ^ msg[2]) != 0xff)     /* 24 bits NEC */
 259                         poll_result->scancode = (msg[1] << 16) |
 260                                                 (msg[2] << 8)  |
 261                                                  msg[3];
 262                 else                                    /* Normal NEC */
 263                         poll_result->scancode = msg[1] << 8 | msg[3];
 264                 break;
 265         case RC_BIT_RC6_0:
 266                 poll_result->scancode = msg[1] << 8 | msg[2];
 267                 break;
 268         default:
 269                 poll_result->scancode = (msg[1] << 24) | (msg[2] << 16) |
 270                                         (msg[3] << 8)  | msg[4];
 271                 break;
 272         }
 273
 274         return 0;
 275 }
 276
 277 /**********************************************************
 278  Polling code for em28xx
 279  **********************************************************/
 280
 281 static int em28xx_i2c_ir_handle_key(struct em28xx_IR *ir)
 282 {
 283         struct em28xx *dev = ir->dev;
 284         static u32 ir_key;
 285         int rc;
 286         struct i2c_client client;
 287
 288         client.adapter = &ir->dev->i2c_adap[dev->def_i2c_bus];
 289         client.addr = ir->i2c_dev_addr;
 290
 291         rc = ir->get_key_i2c(&client, &ir_key);
 292         if (rc < 0) {
 293                 dprintk("ir->get_key_i2c() failed: %d\n", rc);
 294                 return rc;
 295         }
 296
 297         if (rc) {
 298                 dprintk("%s: keycode = 0x%04x\n", __func__, ir_key);
 299                 rc_keydown(ir->rc, ir_key, 0);
 300         }
 301         return 0;
 302 }
 303
 304 static void em28xx_ir_handle_key(struct em28xx_IR *ir)
 305 {
 306         int result;
 307         struct em28xx_ir_poll_result poll_result;
 308
 309         /* read the registers containing the IR status */
 310         result = ir->get_key(ir, &poll_result);
 311         if (unlikely(result < 0)) {
 312                 dprintk("ir->get_key() failed: %d\n", result);
 313                 return;
 314         }
 315
 316         if (unlikely(poll_result.read_count != ir->last_readcount)) {
 317                 dprintk("%s: toggle: %d, count: %d, key 0x%04x\n", __func__,
 318                         poll_result.toggle_bit, poll_result.read_count,
 319                         poll_result.scancode);
 320                 if (ir->full_code)
 321                         rc_keydown(ir->rc,
 322                                    poll_result.scancode,
 323                                    poll_result.toggle_bit);
 324                 else
 325                         rc_keydown(ir->rc,
 326                                    poll_result.scancode & 0xff,
 327                                    poll_result.toggle_bit);
 328
 329                 if (ir->dev->chip_id == CHIP_ID_EM2874 ||
 330                     ir->dev->chip_id == CHIP_ID_EM2884)
 331                         /* The em2874 clears the readcount field every time the
 332                            register is read.  The em2860/2880 datasheet says that it
 333                            is supposed to clear the readcount, but it doesn't.  So with
 334                            the em2874, we are looking for a non-zero read count as
 335                            opposed to a readcount that is incrementing */
 336                         ir->last_readcount = 0;
 337                 else
 338                         ir->last_readcount = poll_result.read_count;
 339         }
 340 }
 341
 342 static void em28xx_ir_work(struct work_struct *work)
 343 {
 344         struct em28xx_IR *ir = container_of(work, struct em28xx_IR, work.work);
 345
 346         if (ir->i2c_dev_addr) /* external i2c device */
 347                 em28xx_i2c_ir_handle_key(ir);
 348         else /* internal device */
 349                 em28xx_ir_handle_key(ir);
 350         schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling));
 351 }
 352
 353 static int em28xx_ir_start(struct rc_dev *rc)
 354 {
 355         struct em28xx_IR *ir = rc->priv;
 356
 357         INIT_DELAYED_WORK(&ir->work, em28xx_ir_work);
 358         schedule_delayed_work(&ir->work, 0);
 359
 360         return 0;
 361 }
 362
 363 static void em28xx_ir_stop(struct rc_dev *rc)
 364 {
 365         struct em28xx_IR *ir = rc->priv;
 366
 367         cancel_delayed_work_sync(&ir->work);
 368 }
 369
 370 static int em2860_ir_change_protocol(struct rc_dev *rc_dev, u64 *rc_type)
 371 {
 372         struct em28xx_IR *ir = rc_dev->priv;
 373         struct em28xx *dev = ir->dev;
 374
 375         /* Adjust xclk based on IR table for RC5/NEC tables */
 376         if (*rc_type & RC_BIT_RC5) {
 377                 dev->board.xclk |= EM28XX_XCLK_IR_RC5_MODE;
 378                 ir->full_code = 1;
 379                 *rc_type = RC_BIT_RC5;
 380         } else if (*rc_type & RC_BIT_NEC) {
 381                 dev->board.xclk &= ~EM28XX_XCLK_IR_RC5_MODE;
 382                 ir->full_code = 1;
 383                 *rc_type = RC_BIT_NEC;
 384         } else if (*rc_type & RC_BIT_UNKNOWN) {
 385                 *rc_type = RC_BIT_UNKNOWN;
 386         } else {
 387                 *rc_type = ir->rc_type;
 388                 return -EINVAL;
 389         }
 390         em28xx_write_reg_bits(dev, EM28XX_R0F_XCLK, dev->board.xclk,
 391                               EM28XX_XCLK_IR_RC5_MODE);
 392
 393         ir->rc_type = *rc_type;
 394
 395         return 0;
 396 }
 397
 398 static int em2874_ir_change_protocol(struct rc_dev *rc_dev, u64 *rc_type)
 399 {
 400         struct em28xx_IR *ir = rc_dev->priv;
 401         struct em28xx *dev = ir->dev;
 402         u8 ir_config = EM2874_IR_RC5;
 403
 404         /* Adjust xclk and set type based on IR table for RC5/NEC/RC6 tables */
 405         if (*rc_type & RC_BIT_RC5) {
 406                 dev->board.xclk |= EM28XX_XCLK_IR_RC5_MODE;
 407                 ir->full_code = 1;
 408                 *rc_type = RC_BIT_RC5;
 409         } else if (*rc_type & RC_BIT_NEC) {
 410                 dev->board.xclk &= ~EM28XX_XCLK_IR_RC5_MODE;
 411                 ir_config = EM2874_IR_NEC | EM2874_IR_NEC_NO_PARITY;
 412                 ir->full_code = 1;
 413                 *rc_type = RC_BIT_NEC;
 414         } else if (*rc_type & RC_BIT_RC6_0) {
 415                 dev->board.xclk |= EM28XX_XCLK_IR_RC5_MODE;
 416                 ir_config = EM2874_IR_RC6_MODE_0;
 417                 ir->full_code = 1;
 418                 *rc_type = RC_BIT_RC6_0;
 419         } else if (*rc_type & RC_BIT_UNKNOWN) {
 420                 *rc_type = RC_BIT_UNKNOWN;
 421         } else {
 422                 *rc_type = ir->rc_type;
 423                 return -EINVAL;
 424         }
 425         em28xx_write_regs(dev, EM2874_R50_IR_CONFIG, &ir_config, 1);
 426         em28xx_write_reg_bits(dev, EM28XX_R0F_XCLK, dev->board.xclk,
 427                               EM28XX_XCLK_IR_RC5_MODE);
 428
 429         ir->rc_type = *rc_type;
 430
 431         return 0;
 432 }
 433 static int em28xx_ir_change_protocol(struct rc_dev *rc_dev, u64 *rc_type)
 434 {
 435         struct em28xx_IR *ir = rc_dev->priv;
 436         struct em28xx *dev = ir->dev;
 437
 438         /* Setup the proper handler based on the chip */
 439         switch (dev->chip_id) {
 440         case CHIP_ID_EM2860:
 441         case CHIP_ID_EM2883:
 442                 return em2860_ir_change_protocol(rc_dev, rc_type);
 443         case CHIP_ID_EM2884:
 444         case CHIP_ID_EM2874:
 445         case CHIP_ID_EM28174:
 446         case CHIP_ID_EM28178:
 447                 return em2874_ir_change_protocol(rc_dev, rc_type);
 448         default:
 449                 printk("Unrecognized em28xx chip id 0x%02x: IR not supported\n",
 450                         dev->chip_id);
 451                 return -EINVAL;
 452         }
 453 }
 454
 455 static int em28xx_probe_i2c_ir(struct em28xx *dev)
 456 {
 457         int i = 0;
 458         /* Leadtek winfast tv USBII deluxe can find a non working IR-device */
 459         /* at address 0x18, so if that address is needed for another board in */
 460         /* the future, please put it after 0x1f. */
 461         const unsigned short addr_list[] = {
 462                  0x1f, 0x30, 0x47, I2C_CLIENT_END
 463         };
 464
 465         while (addr_list[i] != I2C_CLIENT_END) {
 466                 if (i2c_probe_func_quick_read(&dev->i2c_adap[dev->def_i2c_bus], addr_list[i]) == 1)
 467                         return addr_list[i];
 468                 i++;
 469         }
 470
 471         return -ENODEV;
 472 }
 473
 474 /**********************************************************
 475  Handle buttons
 476  **********************************************************/
 477
 478 static void em28xx_query_buttons(struct work_struct *work)
 479 {
 480         struct em28xx *dev =
 481                 container_of(work, struct em28xx, buttons_query_work.work);
 482         u8 i, j;
 483         int regval;
 484         bool is_pressed, was_pressed;
 485         const struct em28xx_led *led;
 486
 487         /* Poll and evaluate all addresses */
 488         for (i = 0; i < dev->num_button_polling_addresses; i++) {
 489                 /* Read value from register */
 490                 regval = em28xx_read_reg(dev, dev->button_polling_addresses[i]);
 491                 if (regval < 0)
 492                         continue;
 493                 /* Check states of the buttons and act */
 494                 j = 0;
 495                 while (dev->board.buttons[j].role >= 0 &&
 496                          dev->board.buttons[j].role < EM28XX_NUM_BUTTON_ROLES) {
 497                         struct em28xx_button *button = &dev->board.buttons[j];
 498                         /* Check if button uses the current address */
 499                         if (button->reg_r != dev->button_polling_addresses[i]) {
 500                                 j++;
 501                                 continue;
 502                         }
 503                         /* Determine if button is and was pressed last time */
 504                         is_pressed = regval & button->mask;
 505                         was_pressed = dev->button_polling_last_values[i]
 506                                        & button->mask;
 507                         if (button->inverted) {
 508                                 is_pressed = !is_pressed;
 509                                 was_pressed = !was_pressed;
 510                         }
 511                         /* Clear button state (if needed) */
 512                         if (is_pressed && button->reg_clearing)
 513                                 em28xx_write_reg(dev, button->reg_clearing,
 514                                                  (~regval & button->mask)
 515                                                     | (regval & ~button->mask));
 516                         /* Handle button state */
 517                         if (!is_pressed || was_pressed) {
 518                                 j++;
 519                                 continue;
 520                         }
 521                         switch (button->role) {
 522                         case EM28XX_BUTTON_SNAPSHOT:
 523                                 /* Emulate the keypress */
 524                                 input_report_key(dev->sbutton_input_dev,
 525                                                  EM28XX_SNAPSHOT_KEY, 1);
 526                                 /* Unpress the key */
 527                                 input_report_key(dev->sbutton_input_dev,
 528                                                  EM28XX_SNAPSHOT_KEY, 0);
 529                                 break;
 530                         case EM28XX_BUTTON_ILLUMINATION:
 531                                 led = em28xx_find_led(dev,
 532                                                       EM28XX_LED_ILLUMINATION);
 533                                 /* Switch illumination LED on/off */
 534                                 if (led)
 535                                         em28xx_toggle_reg_bits(dev,
 536                                                                led->gpio_reg,
 537                                                                led->gpio_mask);
 538                                 break;
 539                         default:
 540                                 WARN_ONCE(1, "BUG: unhandled button role.");
 541                         }
 542                         /* Next button */
 543                         j++;
 544                 }
 545                 /* Save current value for comparison during the next polling */
 546                 dev->button_polling_last_values[i] = regval;
 547         }
 548         /* Schedule next poll */
 549         schedule_delayed_work(&dev->buttons_query_work,
 550                               msecs_to_jiffies(dev->button_polling_interval));
 551 }
 552
 553 static int em28xx_register_snapshot_button(struct em28xx *dev)
 554 {
 555         struct input_dev *input_dev;
 556         int err;
 557
 558         em28xx_info("Registering snapshot button...\n");
 559         input_dev = input_allocate_device();
 560         if (!input_dev)
 561                 return -ENOMEM;
 562
 563         usb_make_path(dev->udev, dev->snapshot_button_path,
 564                       sizeof(dev->snapshot_button_path));
 565         strlcat(dev->snapshot_button_path, "/sbutton",
 566                 sizeof(dev->snapshot_button_path));
 567
 568         input_dev->name = "em28xx snapshot button";
 569         input_dev->phys = dev->snapshot_button_path;
 570         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
 571         set_bit(EM28XX_SNAPSHOT_KEY, input_dev->keybit);
 572         input_dev->keycodesize = 0;
 573         input_dev->keycodemax = 0;
 574         input_dev->id.bustype = BUS_USB;
 575         input_dev->id.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
 576         input_dev->id.product = le16_to_cpu(dev->udev->descriptor.idProduct);
 577         input_dev->id.version = 1;
 578         input_dev->dev.parent = &dev->udev->dev;
 579
 580         err = input_register_device(input_dev);
 581         if (err) {
 582                 em28xx_errdev("input_register_device failed\n");
 583                 input_free_device(input_dev);
 584                 return err;
 585         }
 586
 587         dev->sbutton_input_dev = input_dev;
 588         return 0;
 589 }
 590
 591 static void em28xx_init_buttons(struct em28xx *dev)
 592 {
 593         u8  i = 0, j = 0;
 594         bool addr_new = 0;
 595
 596         dev->button_polling_interval = EM28XX_BUTTONS_DEBOUNCED_QUERY_INTERVAL;
 597         while (dev->board.buttons[i].role >= 0 &&
 598                          dev->board.buttons[i].role < EM28XX_NUM_BUTTON_ROLES) {
 599                 struct em28xx_button *button = &dev->board.buttons[i];
 600                 /* Check if polling address is already on the list */
 601                 addr_new = 1;
 602                 for (j = 0; j < dev->num_button_polling_addresses; j++) {
 603                         if (button->reg_r == dev->button_polling_addresses[j]) {
 604                                 addr_new = 0;
 605                                 break;
 606                         }
 607                 }
 608                 /* Check if max. number of polling addresses is exceeded */
 609                 if (addr_new && dev->num_button_polling_addresses
 610                                            >= EM28XX_NUM_BUTTON_ADDRESSES_MAX) {
 611                         WARN_ONCE(1, "BUG: maximum number of button polling addresses exceeded.");
 612                         goto next_button;
 613                 }
 614                 /* Button role specific checks and actions */
 615                 if (button->role == EM28XX_BUTTON_SNAPSHOT) {
 616                         /* Register input device */
 617                         if (em28xx_register_snapshot_button(dev) < 0)
 618                                 goto next_button;
 619                 } else if (button->role == EM28XX_BUTTON_ILLUMINATION) {
 620                         /* Check sanity */
 621                         if (!em28xx_find_led(dev, EM28XX_LED_ILLUMINATION)) {
 622                                 em28xx_errdev("BUG: illumination button defined, but no illumination LED.\n");
 623                                 goto next_button;
 624                         }
 625                 }
 626                 /* Add read address to list of polling addresses */
 627                 if (addr_new) {
 628                         unsigned int index = dev->num_button_polling_addresses;
 629                         dev->button_polling_addresses[index] = button->reg_r;
 630                         dev->num_button_polling_addresses++;
 631                 }
 632                 /* Reduce polling interval if necessary */
 633                 if (!button->reg_clearing)
 634                         dev->button_polling_interval =
 635                                          EM28XX_BUTTONS_VOLATILE_QUERY_INTERVAL;
 636 next_button:
 637                 /* Next button */
 638                 i++;
 639         }
 640
 641         /* Start polling */
 642         if (dev->num_button_polling_addresses) {
 643                 memset(dev->button_polling_last_values, 0,
 644                                                EM28XX_NUM_BUTTON_ADDRESSES_MAX);
 645                 INIT_DELAYED_WORK(&dev->buttons_query_work,
 646                                                           em28xx_query_buttons);
 647                 schedule_delayed_work(&dev->buttons_query_work,
 648                                msecs_to_jiffies(dev->button_polling_interval));
 649         }
 650 }
 651
 652 static void em28xx_shutdown_buttons(struct em28xx *dev)
 653 {
 654         /* Cancel polling */
 655         cancel_delayed_work_sync(&dev->buttons_query_work);
 656         /* Clear polling addresses list */
 657         dev->num_button_polling_addresses = 0;
 658         /* Deregister input devices */
 659         if (dev->sbutton_input_dev != NULL) {
 660                 em28xx_info("Deregistering snapshot button\n");
 661                 input_unregister_device(dev->sbutton_input_dev);
 662                 dev->sbutton_input_dev = NULL;
 663         }
 664 }
 665
 666 static int em28xx_ir_init(struct em28xx *dev)
 667 {
 668         struct em28xx_IR *ir;
 669         struct rc_dev *rc;
 670         int err = -ENOMEM;
 671         u64 rc_type;
 672         u16 i2c_rc_dev_addr = 0;
 673
 674         if (dev->is_audio_only) {
 675                 /* Shouldn't initialize IR for this interface */
 676                 return 0;
 677         }
 678
 679         kref_get(&dev->ref);
 680
 681         if (dev->board.buttons)
 682                 em28xx_init_buttons(dev);
 683
 684         if (dev->board.has_ir_i2c) {
 685                 i2c_rc_dev_addr = em28xx_probe_i2c_ir(dev);
 686                 if (!i2c_rc_dev_addr) {
 687                         dev->board.has_ir_i2c = 0;
 688                         em28xx_warn("No i2c IR remote control device found.\n");
 689                         return -ENODEV;
 690                 }
 691         }
 692
 693         if (dev->board.ir_codes == NULL && !dev->board.has_ir_i2c) {
 694                 /* No remote control support */
 695                 em28xx_warn("Remote control support is not available for "
 696                                 "this card.\n");
 697                 return 0;
 698         }
 699
 700         em28xx_info("Registering input extension\n");
 701
 702         ir = kzalloc(sizeof(*ir), GFP_KERNEL);
 703         rc = rc_allocate_device();
 704         if (!ir || !rc)
 705                 goto error;
 706
 707         /* record handles to ourself */
 708         ir->dev = dev;
 709         dev->ir = ir;
 710         ir->rc = rc;
 711
 712         rc->priv = ir;
 713         rc->open = em28xx_ir_start;
 714         rc->close = em28xx_ir_stop;
 715
 716         if (dev->board.has_ir_i2c) {    /* external i2c device */
 717                 switch (dev->model) {
 718                 case EM2800_BOARD_TERRATEC_CINERGY_200:
 719                 case EM2820_BOARD_TERRATEC_CINERGY_250:
 720                         rc->map_name = RC_MAP_EM_TERRATEC;
 721                         ir->get_key_i2c = em28xx_get_key_terratec;
 722                         break;
 723                 case EM2820_BOARD_PINNACLE_USB_2:
 724                         rc->map_name = RC_MAP_PINNACLE_GREY;
 725                         ir->get_key_i2c = em28xx_get_key_pinnacle_usb_grey;
 726                         break;
 727                 case EM2820_BOARD_HAUPPAUGE_WINTV_USB_2:
 728                         rc->map_name = RC_MAP_HAUPPAUGE;
 729                         ir->get_key_i2c = em28xx_get_key_em_haup;
 730                         rc_set_allowed_protocols(rc, RC_BIT_RC5);
 731                         break;
 732                 case EM2820_BOARD_LEADTEK_WINFAST_USBII_DELUXE:
 733                         rc->map_name = RC_MAP_WINFAST_USBII_DELUXE;
 734                         ir->get_key_i2c = em28xx_get_key_winfast_usbii_deluxe;
 735                         break;
 736                 default:
 737                         err = -ENODEV;
 738                         goto error;
 739                 }
 740
 741                 ir->i2c_dev_addr = i2c_rc_dev_addr;
 742         } else {        /* internal device */
 743                 switch (dev->chip_id) {
 744                 case CHIP_ID_EM2860:
 745                 case CHIP_ID_EM2883:
 746                         rc_set_allowed_protocols(rc, RC_BIT_RC5 | RC_BIT_NEC);
 747                         ir->get_key = default_polling_getkey;
 748                         break;
 749                 case CHIP_ID_EM2884:
 750                 case CHIP_ID_EM2874:
 751                 case CHIP_ID_EM28174:
 752                 case CHIP_ID_EM28178:
 753                         ir->get_key = em2874_polling_getkey;
 754                         rc_set_allowed_protocols(rc, RC_BIT_RC5 | RC_BIT_NEC |
 755                                                  RC_BIT_RC6_0);
 756                         break;
 757                 default:
 758                         err = -ENODEV;
 759                         goto error;
 760                 }
 761
 762                 rc->change_protocol = em28xx_ir_change_protocol;
 763                 rc->map_name = dev->board.ir_codes;
 764
 765                 /* By default, keep protocol field untouched */
 766                 rc_type = RC_BIT_UNKNOWN;
 767                 err = em28xx_ir_change_protocol(rc, &rc_type);
 768                 if (err)
 769                         goto error;
 770         }
 771
 772         /* This is how often we ask the chip for IR information */
 773         ir->polling = 100; /* ms */
 774
 775         /* init input device */
 776         snprintf(ir->name, sizeof(ir->name), "em28xx IR (%s)", dev->name);
 777
 778         usb_make_path(dev->udev, ir->phys, sizeof(ir->phys));
 779         strlcat(ir->phys, "/input0", sizeof(ir->phys));
 780
 781         rc->input_name = ir->name;
 782         rc->input_phys = ir->phys;
 783         rc->input_id.bustype = BUS_USB;
 784         rc->input_id.version = 1;
 785         rc->input_id.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
 786         rc->input_id.product = le16_to_cpu(dev->udev->descriptor.idProduct);
 787         rc->dev.parent = &dev->udev->dev;
 788         rc->driver_name = MODULE_NAME;
 789
 790         /* all done */
 791         err = rc_register_device(rc);
 792         if (err)
 793                 goto error;
 794
 795         em28xx_info("Input extension successfully initalized\n");
 796
 797         return 0;
 798
 799 error:
 800         dev->ir = NULL;
 801         rc_free_device(rc);
 802         kfree(ir);
 803         return err;
 804 }
 805
 806 static int em28xx_ir_fini(struct em28xx *dev)
 807 {
 808         struct em28xx_IR *ir = dev->ir;
 809
 810         if (dev->is_audio_only) {
 811                 /* Shouldn't initialize IR for this interface */
 812                 return 0;
 813         }
 814
 815         em28xx_info("Closing input extension");
 816
 817         em28xx_shutdown_buttons(dev);
 818
 819         /* skip detach on non attached boards */
 820         if (!ir)
 821                 goto ref_put;
 822
 823         if (ir->rc)
 824                 rc_unregister_device(ir->rc);
 825
 826         /* done */
 827         kfree(ir);
 828         dev->ir = NULL;
 829
 830 ref_put:
 831         kref_put(&dev->ref, em28xx_free_device);
 832
 833         return 0;
 834 }
 835
 836 static int em28xx_ir_suspend(struct em28xx *dev)
 837 {
 838         struct em28xx_IR *ir = dev->ir;
 839
 840         if (dev->is_audio_only)
 841                 return 0;
 842
 843         em28xx_info("Suspending input extension");
 844         if (ir)
 845                 cancel_delayed_work_sync(&ir->work);
 846         cancel_delayed_work_sync(&dev->buttons_query_work);
 847         /* is canceling delayed work sufficient or does the rc event
 848            kthread needs stopping? kthread is stopped in
 849            ir_raw_event_unregister() */
 850         return 0;
 851 }
 852
 853 static int em28xx_ir_resume(struct em28xx *dev)
 854 {
 855         struct em28xx_IR *ir = dev->ir;
 856
 857         if (dev->is_audio_only)
 858                 return 0;
 859
 860         em28xx_info("Resuming input extension");
 861         /* if suspend calls ir_raw_event_unregister(), the should call
 862            ir_raw_event_register() */
 863         if (ir)
 864                 schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling));
 865         if (dev->num_button_polling_addresses)
 866                 schedule_delayed_work(&dev->buttons_query_work,
 867                                msecs_to_jiffies(dev->button_polling_interval));
 868         return 0;
 869 }
 870
 871 static struct em28xx_ops rc_ops = {
 872         .id   = EM28XX_RC,
 873         .name = "Em28xx Input Extension",
 874         .init = em28xx_ir_init,
 875         .fini = em28xx_ir_fini,
 876         .suspend = em28xx_ir_suspend,
 877         .resume = em28xx_ir_resume,
 878 };
 879
 880 static int __init em28xx_rc_register(void)
 881 {
 882         return em28xx_register_extension(&rc_ops);
 883 }
 884
 885 static void __exit em28xx_rc_unregister(void)
 886 {
 887         em28xx_unregister_extension(&rc_ops);
 888 }
 889
 890 MODULE_LICENSE("GPL");
 891 MODULE_AUTHOR("Mauro Carvalho Chehab");
 892 MODULE_DESCRIPTION(DRIVER_DESC " - input interface");
 893 MODULE_VERSION(EM28XX_VERSION);
 894
 895 module_init(em28xx_rc_register);
 896 module_exit(em28xx_rc_unregister);