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

   1 // SPDX-License-Identifier: GPL-2.0+
   2 //
   3 // handle em28xx IR remotes via linux kernel input layer.
   4 //
   5 // Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
   6 //                    Markus Rechberger <mrechberger@gmail.com>
   7 //                    Mauro Carvalho Chehab <mchehab@kernel.org>
   8 //                    Sascha Sommer <saschasommer@freenet.de>
   9 //
  10 // This program is free software; you can redistribute it and/or modify
  11 // it under the terms of the GNU General Public License as published by
  12 // the Free Software Foundation; either version 2 of the License, or
  13 // (at your option) any later version.
  14 //
  15 // This program is distributed in the hope that it will be useful,
  16 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 // GNU General Public License for more details.
  19
  20 #include "em28xx.h"
  21
  22 #include <linux/module.h>
  23 #include <linux/init.h>
  24 #include <linux/delay.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/usb.h>
  27 #include <linux/usb/input.h>
  28 #include <linux/slab.h>
  29 #include <linux/bitrev.h>
  30
  31 #define EM28XX_SNAPSHOT_KEY                             KEY_CAMERA
  32 #define EM28XX_BUTTONS_DEBOUNCED_QUERY_INTERVAL         500 /* [ms] */
  33 #define EM28XX_BUTTONS_VOLATILE_QUERY_INTERVAL          100 /* [ms] */
  34
  35 static unsigned int ir_debug;
  36 module_param(ir_debug, int, 0644);
  37 MODULE_PARM_DESC(ir_debug, "enable debug messages [IR]");
  38
  39 #define MODULE_NAME "em28xx"
  40
  41 #define dprintk(fmt, arg...) do {                                       \
  42         if (ir_debug)                                                   \
  43                 dev_printk(KERN_DEBUG, &ir->dev->intf->dev,             \
  44                            "input: %s: " fmt, __func__, ## arg);        \
  45 } while (0)
  46
  47 /*
  48  * Polling structure used by em28xx IR's
  49  */
  50
  51 struct em28xx_ir_poll_result {
  52         unsigned int toggle_bit:1;
  53         unsigned int read_count:7;
  54
  55         enum rc_proto protocol;
  56         u32 scancode;
  57 };
  58
  59 struct em28xx_IR {
  60         struct em28xx *dev;
  61         struct rc_dev *rc;
  62         char phys[32];
  63
  64         /* poll decoder */
  65         int polling;
  66         struct delayed_work work;
  67         unsigned int full_code:1;
  68         unsigned int last_readcount;
  69         u64 rc_proto;
  70
  71         struct i2c_client *i2c_client;
  72
  73         int  (*get_key_i2c)(struct i2c_client *ir, enum rc_proto *protocol,
  74                             u32 *scancode);
  75         int  (*get_key)(struct em28xx_IR *ir, struct em28xx_ir_poll_result *r);
  76 };
  77
  78 /*
  79  * I2C IR based get keycodes - should be used with ir-kbd-i2c
  80  */
  81
  82 static int em28xx_get_key_terratec(struct i2c_client *i2c_dev,
  83                                    enum rc_proto *protocol, u32 *scancode)
  84 {
  85         int rc;
  86         unsigned char b;
  87
  88         /* poll IR chip */
  89         rc = i2c_master_recv(i2c_dev, &b, 1);
  90         if (rc != 1) {
  91                 if (rc < 0)
  92                         return rc;
  93                 return -EIO;
  94         }
  95
  96         /*
  97          * it seems that 0xFE indicates that a button is still hold
  98          * down, while 0xff indicates that no button is hold down.
  99          */
 100
 101         if (b == 0xff)
 102                 return 0;
 103
 104         if (b == 0xfe)
 105                 /* keep old data */
 106                 return 1;
 107
 108         *protocol = RC_PROTO_UNKNOWN;
 109         *scancode = b;
 110         return 1;
 111 }
 112
 113 static int em28xx_get_key_em_haup(struct i2c_client *i2c_dev,
 114                                   enum rc_proto *protocol, u32 *scancode)
 115 {
 116         unsigned char buf[2];
 117         int size;
 118
 119         /* poll IR chip */
 120         size = i2c_master_recv(i2c_dev, buf, sizeof(buf));
 121
 122         if (size != 2)
 123                 return -EIO;
 124
 125         /* Does eliminate repeated parity code */
 126         if (buf[1] == 0xff)
 127                 return 0;
 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         *protocol = RC_PROTO_RC5;
 139         *scancode = (bitrev8(buf[1]) & 0x1f) << 8 | bitrev8(buf[0]) >> 2;
 140         return 1;
 141 }
 142
 143 static int em28xx_get_key_pinnacle_usb_grey(struct i2c_client *i2c_dev,
 144                                             enum rc_proto *protocol,
 145                                             u32 *scancode)
 146 {
 147         unsigned char buf[3];
 148
 149         /* poll IR chip */
 150
 151         if (i2c_master_recv(i2c_dev, buf, 3) != 3)
 152                 return -EIO;
 153
 154         if (buf[0] != 0x00)
 155                 return 0;
 156
 157         *protocol = RC_PROTO_UNKNOWN;
 158         *scancode = buf[2] & 0x3f;
 159         return 1;
 160 }
 161
 162 static int em28xx_get_key_winfast_usbii_deluxe(struct i2c_client *i2c_dev,
 163                                                enum rc_proto *protocol,
 164                                                u32 *scancode)
 165 {
 166         unsigned char subaddr, keydetect, key;
 167
 168         struct i2c_msg msg[] = {
 169                 {
 170                         .addr = i2c_dev->addr,
 171                         .flags = 0,
 172                         .buf = &subaddr, .len = 1
 173                 }, {
 174                         .addr = i2c_dev->addr,
 175                         .flags = I2C_M_RD,
 176                         .buf = &keydetect,
 177                         .len = 1
 178                 }
 179         };
 180
 181         subaddr = 0x10;
 182         if (i2c_transfer(i2c_dev->adapter, msg, 2) != 2)
 183                 return -EIO;
 184         if (keydetect == 0x00)
 185                 return 0;
 186
 187         subaddr = 0x00;
 188         msg[1].buf = &key;
 189         if (i2c_transfer(i2c_dev->adapter, msg, 2) != 2)
 190                 return -EIO;
 191         if (key == 0x00)
 192                 return 0;
 193
 194         *protocol = RC_PROTO_UNKNOWN;
 195         *scancode = 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         /*
 212          * Read key toggle, brand, and key code
 213          * on registers 0x45, 0x46 and 0x47
 214          */
 215         rc = dev->em28xx_read_reg_req_len(dev, 0, EM28XX_R45_IR,
 216                                           msg, sizeof(msg));
 217         if (rc < 0)
 218                 return rc;
 219
 220         /* Infrared toggle (Reg 0x45[7]) */
 221         poll_result->toggle_bit = (msg[0] >> 7);
 222
 223         /* Infrared read count (Reg 0x45[6:0] */
 224         poll_result->read_count = (msg[0] & 0x7f);
 225
 226         /* Remote Control Address/Data (Regs 0x46/0x47) */
 227         switch (ir->rc_proto) {
 228         case RC_PROTO_BIT_RC5:
 229                 poll_result->protocol = RC_PROTO_RC5;
 230                 poll_result->scancode = RC_SCANCODE_RC5(msg[1], msg[2]);
 231                 break;
 232
 233         case RC_PROTO_BIT_NEC:
 234                 poll_result->protocol = RC_PROTO_NEC;
 235                 poll_result->scancode = RC_SCANCODE_NEC(msg[1], msg[2]);
 236                 break;
 237
 238         default:
 239                 poll_result->protocol = RC_PROTO_UNKNOWN;
 240                 poll_result->scancode = msg[1] << 8 | msg[2];
 241                 break;
 242         }
 243
 244         return 0;
 245 }
 246
 247 static int em2874_polling_getkey(struct em28xx_IR *ir,
 248                                  struct em28xx_ir_poll_result *poll_result)
 249 {
 250         struct em28xx *dev = ir->dev;
 251         int rc;
 252         u8 msg[5] = { 0, 0, 0, 0, 0 };
 253
 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         /*
 270          * Remote Control Address (Reg 0x52)
 271          * Remote Control Data (Reg 0x53-0x55)
 272          */
 273         switch (ir->rc_proto) {
 274         case RC_PROTO_BIT_RC5:
 275                 poll_result->protocol = RC_PROTO_RC5;
 276                 poll_result->scancode = RC_SCANCODE_RC5(msg[1], msg[2]);
 277                 break;
 278
 279         case RC_PROTO_BIT_NEC:
 280                 poll_result->scancode = ir_nec_bytes_to_scancode(msg[1], msg[2], msg[3], msg[4],
 281                                                                  &poll_result->protocol);
 282                 break;
 283
 284         case RC_PROTO_BIT_RC6_0:
 285                 poll_result->protocol = RC_PROTO_RC6_0;
 286                 poll_result->scancode = RC_SCANCODE_RC6_0(msg[1], msg[2]);
 287                 break;
 288
 289         default:
 290                 poll_result->protocol = RC_PROTO_UNKNOWN;
 291                 poll_result->scancode = (msg[1] << 24) | (msg[2] << 16) |
 292                                         (msg[3] << 8)  | msg[4];
 293                 break;
 294         }
 295
 296         return 0;
 297 }
 298
 299 /*
 300  * Polling code for em28xx
 301  */
 302
 303 static int em28xx_i2c_ir_handle_key(struct em28xx_IR *ir)
 304 {
 305         static u32 scancode;
 306         enum rc_proto protocol;
 307         int rc;
 308
 309         rc = ir->get_key_i2c(ir->i2c_client, &protocol, &scancode);
 310         if (rc < 0) {
 311                 dprintk("ir->get_key_i2c() failed: %d\n", rc);
 312                 return rc;
 313         }
 314
 315         if (rc) {
 316                 dprintk("%s: proto = 0x%04x, scancode = 0x%04x\n",
 317                         __func__, protocol, scancode);
 318                 rc_keydown(ir->rc, protocol, scancode, 0);
 319         }
 320         return 0;
 321 }
 322
 323 static void em28xx_ir_handle_key(struct em28xx_IR *ir)
 324 {
 325         int result;
 326         struct em28xx_ir_poll_result poll_result;
 327
 328         /* read the registers containing the IR status */
 329         result = ir->get_key(ir, &poll_result);
 330         if (unlikely(result < 0)) {
 331                 dprintk("ir->get_key() failed: %d\n", result);
 332                 return;
 333         }
 334
 335         if (unlikely(poll_result.read_count != ir->last_readcount)) {
 336                 dprintk("%s: toggle: %d, count: %d, key 0x%04x\n", __func__,
 337                         poll_result.toggle_bit, poll_result.read_count,
 338                         poll_result.scancode);
 339                 if (ir->full_code)
 340                         rc_keydown(ir->rc,
 341                                    poll_result.protocol,
 342                                    poll_result.scancode,
 343                                    poll_result.toggle_bit);
 344                 else
 345                         rc_keydown(ir->rc,
 346                                    RC_PROTO_UNKNOWN,
 347                                    poll_result.scancode & 0xff,
 348                                    poll_result.toggle_bit);
 349
 350                 if (ir->dev->chip_id == CHIP_ID_EM2874 ||
 351                     ir->dev->chip_id == CHIP_ID_EM2884)
 352                         /*
 353                          * The em2874 clears the readcount field every time the
 354                          * register is read.  The em2860/2880 datasheet says
 355                          * that it is supposed to clear the readcount, but it
 356                          * doesn't. So with the em2874, we are looking for a
 357                          * non-zero read count as opposed to a readcount
 358                          * that is incrementing
 359                          */
 360                         ir->last_readcount = 0;
 361                 else
 362                         ir->last_readcount = poll_result.read_count;
 363         }
 364 }
 365
 366 static void em28xx_ir_work(struct work_struct *work)
 367 {
 368         struct em28xx_IR *ir = container_of(work, struct em28xx_IR, work.work);
 369
 370         if (ir->i2c_client) /* external i2c device */
 371                 em28xx_i2c_ir_handle_key(ir);
 372         else /* internal device */
 373                 em28xx_ir_handle_key(ir);
 374         schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling));
 375 }
 376
 377 static int em28xx_ir_start(struct rc_dev *rc)
 378 {
 379         struct em28xx_IR *ir = rc->priv;
 380
 381         INIT_DELAYED_WORK(&ir->work, em28xx_ir_work);
 382         schedule_delayed_work(&ir->work, 0);
 383
 384         return 0;
 385 }
 386
 387 static void em28xx_ir_stop(struct rc_dev *rc)
 388 {
 389         struct em28xx_IR *ir = rc->priv;
 390
 391         cancel_delayed_work_sync(&ir->work);
 392 }
 393
 394 static int em2860_ir_change_protocol(struct rc_dev *rc_dev, u64 *rc_proto)
 395 {
 396         struct em28xx_IR *ir = rc_dev->priv;
 397         struct em28xx *dev = ir->dev;
 398
 399         /* Adjust xclk based on IR table for RC5/NEC tables */
 400         if (*rc_proto & RC_PROTO_BIT_RC5) {
 401                 dev->board.xclk |= EM28XX_XCLK_IR_RC5_MODE;
 402                 ir->full_code = 1;
 403                 *rc_proto = RC_PROTO_BIT_RC5;
 404         } else if (*rc_proto & RC_PROTO_BIT_NEC) {
 405                 dev->board.xclk &= ~EM28XX_XCLK_IR_RC5_MODE;
 406                 ir->full_code = 1;
 407                 *rc_proto = RC_PROTO_BIT_NEC;
 408         } else if (*rc_proto & RC_PROTO_BIT_UNKNOWN) {
 409                 *rc_proto = RC_PROTO_BIT_UNKNOWN;
 410         } else {
 411                 *rc_proto = ir->rc_proto;
 412                 return -EINVAL;
 413         }
 414         em28xx_write_reg_bits(dev, EM28XX_R0F_XCLK, dev->board.xclk,
 415                               EM28XX_XCLK_IR_RC5_MODE);
 416
 417         ir->rc_proto = *rc_proto;
 418
 419         return 0;
 420 }
 421
 422 static int em2874_ir_change_protocol(struct rc_dev *rc_dev, u64 *rc_proto)
 423 {
 424         struct em28xx_IR *ir = rc_dev->priv;
 425         struct em28xx *dev = ir->dev;
 426         u8 ir_config = EM2874_IR_RC5;
 427
 428         /* Adjust xclk and set type based on IR table for RC5/NEC/RC6 tables */
 429         if (*rc_proto & RC_PROTO_BIT_RC5) {
 430                 dev->board.xclk |= EM28XX_XCLK_IR_RC5_MODE;
 431                 ir->full_code = 1;
 432                 *rc_proto = RC_PROTO_BIT_RC5;
 433         } else if (*rc_proto & RC_PROTO_BIT_NEC) {
 434                 dev->board.xclk &= ~EM28XX_XCLK_IR_RC5_MODE;
 435                 ir_config = EM2874_IR_NEC | EM2874_IR_NEC_NO_PARITY;
 436                 ir->full_code = 1;
 437                 *rc_proto = RC_PROTO_BIT_NEC;
 438         } else if (*rc_proto & RC_PROTO_BIT_RC6_0) {
 439                 dev->board.xclk |= EM28XX_XCLK_IR_RC5_MODE;
 440                 ir_config = EM2874_IR_RC6_MODE_0;
 441                 ir->full_code = 1;
 442                 *rc_proto = RC_PROTO_BIT_RC6_0;
 443         } else if (*rc_proto & RC_PROTO_BIT_UNKNOWN) {
 444                 *rc_proto = RC_PROTO_BIT_UNKNOWN;
 445         } else {
 446                 *rc_proto = ir->rc_proto;
 447                 return -EINVAL;
 448         }
 449         em28xx_write_regs(dev, EM2874_R50_IR_CONFIG, &ir_config, 1);
 450         em28xx_write_reg_bits(dev, EM28XX_R0F_XCLK, dev->board.xclk,
 451                               EM28XX_XCLK_IR_RC5_MODE);
 452
 453         ir->rc_proto = *rc_proto;
 454
 455         return 0;
 456 }
 457
 458 static int em28xx_ir_change_protocol(struct rc_dev *rc_dev, u64 *rc_proto)
 459 {
 460         struct em28xx_IR *ir = rc_dev->priv;
 461         struct em28xx *dev = ir->dev;
 462
 463         /* Setup the proper handler based on the chip */
 464         switch (dev->chip_id) {
 465         case CHIP_ID_EM2860:
 466         case CHIP_ID_EM2883:
 467                 return em2860_ir_change_protocol(rc_dev, rc_proto);
 468         case CHIP_ID_EM2884:
 469         case CHIP_ID_EM2874:
 470         case CHIP_ID_EM28174:
 471         case CHIP_ID_EM28178:
 472                 return em2874_ir_change_protocol(rc_dev, rc_proto);
 473         default:
 474                 dev_err(&ir->dev->intf->dev,
 475                         "Unrecognized em28xx chip id 0x%02x: IR not supported\n",
 476                         dev->chip_id);
 477                 return -EINVAL;
 478         }
 479 }
 480
 481 static int em28xx_probe_i2c_ir(struct em28xx *dev)
 482 {
 483         int i = 0;
 484         /*
 485          * Leadtek winfast tv USBII deluxe can find a non working IR-device
 486          * at address 0x18, so if that address is needed for another board in
 487          * the future, please put it after 0x1f.
 488          */
 489         static const unsigned short addr_list[] = {
 490                  0x1f, 0x30, 0x47, I2C_CLIENT_END
 491         };
 492
 493         while (addr_list[i] != I2C_CLIENT_END) {
 494                 if (i2c_probe_func_quick_read(&dev->i2c_adap[dev->def_i2c_bus],
 495                                               addr_list[i]) == 1)
 496                         return addr_list[i];
 497                 i++;
 498         }
 499
 500         return -ENODEV;
 501 }
 502
 503 /*
 504  * Handle buttons
 505  */
 506
 507 static void em28xx_query_buttons(struct work_struct *work)
 508 {
 509         struct em28xx *dev =
 510                 container_of(work, struct em28xx, buttons_query_work.work);
 511         u8 i, j;
 512         int regval;
 513         bool is_pressed, was_pressed;
 514         const struct em28xx_led *led;
 515
 516         /* Poll and evaluate all addresses */
 517         for (i = 0; i < dev->num_button_polling_addresses; i++) {
 518                 /* Read value from register */
 519                 regval = em28xx_read_reg(dev, dev->button_polling_addresses[i]);
 520                 if (regval < 0)
 521                         continue;
 522                 /* Check states of the buttons and act */
 523                 j = 0;
 524                 while (dev->board.buttons[j].role >= 0 &&
 525                        dev->board.buttons[j].role < EM28XX_NUM_BUTTON_ROLES) {
 526                         const struct em28xx_button *button;
 527
 528                         button = &dev->board.buttons[j];
 529
 530                         /* Check if button uses the current address */
 531                         if (button->reg_r != dev->button_polling_addresses[i]) {
 532                                 j++;
 533                                 continue;
 534                         }
 535                         /* Determine if button is and was pressed last time */
 536                         is_pressed = regval & button->mask;
 537                         was_pressed = dev->button_polling_last_values[i]
 538                                        & button->mask;
 539                         if (button->inverted) {
 540                                 is_pressed = !is_pressed;
 541                                 was_pressed = !was_pressed;
 542                         }
 543                         /* Clear button state (if needed) */
 544                         if (is_pressed && button->reg_clearing)
 545                                 em28xx_write_reg(dev, button->reg_clearing,
 546                                                  (~regval & button->mask)
 547                                                     | (regval & ~button->mask));
 548                         /* Handle button state */
 549                         if (!is_pressed || was_pressed) {
 550                                 j++;
 551                                 continue;
 552                         }
 553                         switch (button->role) {
 554                         case EM28XX_BUTTON_SNAPSHOT:
 555                                 /* Emulate the keypress */
 556                                 input_report_key(dev->sbutton_input_dev,
 557                                                  EM28XX_SNAPSHOT_KEY, 1);
 558                                 /* Unpress the key */
 559                                 input_report_key(dev->sbutton_input_dev,
 560                                                  EM28XX_SNAPSHOT_KEY, 0);
 561                                 break;
 562                         case EM28XX_BUTTON_ILLUMINATION:
 563                                 led = em28xx_find_led(dev,
 564                                                       EM28XX_LED_ILLUMINATION);
 565                                 /* Switch illumination LED on/off */
 566                                 if (led)
 567                                         em28xx_toggle_reg_bits(dev,
 568                                                                led->gpio_reg,
 569                                                                led->gpio_mask);
 570                                 break;
 571                         default:
 572                                 WARN_ONCE(1, "BUG: unhandled button role.");
 573                         }
 574                         /* Next button */
 575                         j++;
 576                 }
 577                 /* Save current value for comparison during the next polling */
 578                 dev->button_polling_last_values[i] = regval;
 579         }
 580         /* Schedule next poll */
 581         schedule_delayed_work(&dev->buttons_query_work,
 582                               msecs_to_jiffies(dev->button_polling_interval));
 583 }
 584
 585 static int em28xx_register_snapshot_button(struct em28xx *dev)
 586 {
 587         struct usb_device *udev = interface_to_usbdev(dev->intf);
 588         struct input_dev *input_dev;
 589         int err;
 590
 591         dev_info(&dev->intf->dev, "Registering snapshot button...\n");
 592         input_dev = input_allocate_device();
 593         if (!input_dev)
 594                 return -ENOMEM;
 595
 596         usb_make_path(udev, dev->snapshot_button_path,
 597                       sizeof(dev->snapshot_button_path));
 598         strlcat(dev->snapshot_button_path, "/sbutton",
 599                 sizeof(dev->snapshot_button_path));
 600
 601         input_dev->name = "em28xx snapshot button";
 602         input_dev->phys = dev->snapshot_button_path;
 603         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
 604         set_bit(EM28XX_SNAPSHOT_KEY, input_dev->keybit);
 605         input_dev->keycodesize = 0;
 606         input_dev->keycodemax = 0;
 607         usb_to_input_id(udev, &input_dev->id);
 608         input_dev->dev.parent = &dev->intf->dev;
 609
 610         err = input_register_device(input_dev);
 611         if (err) {
 612                 dev_err(&dev->intf->dev, "input_register_device failed\n");
 613                 input_free_device(input_dev);
 614                 return err;
 615         }
 616
 617         dev->sbutton_input_dev = input_dev;
 618         return 0;
 619 }
 620
 621 static void em28xx_init_buttons(struct em28xx *dev)
 622 {
 623         u8  i = 0, j = 0;
 624         bool addr_new = false;
 625
 626         dev->button_polling_interval = EM28XX_BUTTONS_DEBOUNCED_QUERY_INTERVAL;
 627         while (dev->board.buttons[i].role >= 0 &&
 628                dev->board.buttons[i].role < EM28XX_NUM_BUTTON_ROLES) {
 629                 const struct em28xx_button *button = &dev->board.buttons[i];
 630
 631                 /* Check if polling address is already on the list */
 632                 addr_new = true;
 633                 for (j = 0; j < dev->num_button_polling_addresses; j++) {
 634                         if (button->reg_r == dev->button_polling_addresses[j]) {
 635                                 addr_new = false;
 636                                 break;
 637                         }
 638                 }
 639                 /* Check if max. number of polling addresses is exceeded */
 640                 if (addr_new && dev->num_button_polling_addresses
 641                                            >= EM28XX_NUM_BUTTON_ADDRESSES_MAX) {
 642                         WARN_ONCE(1, "BUG: maximum number of button polling addresses exceeded.");
 643                         goto next_button;
 644                 }
 645                 /* Button role specific checks and actions */
 646                 if (button->role == EM28XX_BUTTON_SNAPSHOT) {
 647                         /* Register input device */
 648                         if (em28xx_register_snapshot_button(dev) < 0)
 649                                 goto next_button;
 650                 } else if (button->role == EM28XX_BUTTON_ILLUMINATION) {
 651                         /* Check sanity */
 652                         if (!em28xx_find_led(dev, EM28XX_LED_ILLUMINATION)) {
 653                                 dev_err(&dev->intf->dev,
 654                                         "BUG: illumination button defined, but no illumination LED.\n");
 655                                 goto next_button;
 656                         }
 657                 }
 658                 /* Add read address to list of polling addresses */
 659                 if (addr_new) {
 660                         unsigned int index = dev->num_button_polling_addresses;
 661
 662                         dev->button_polling_addresses[index] = button->reg_r;
 663                         dev->num_button_polling_addresses++;
 664                 }
 665                 /* Reduce polling interval if necessary */
 666                 if (!button->reg_clearing)
 667                         dev->button_polling_interval =
 668                                          EM28XX_BUTTONS_VOLATILE_QUERY_INTERVAL;
 669 next_button:
 670                 /* Next button */
 671                 i++;
 672         }
 673
 674         /* Start polling */
 675         if (dev->num_button_polling_addresses) {
 676                 memset(dev->button_polling_last_values, 0,
 677                        EM28XX_NUM_BUTTON_ADDRESSES_MAX);
 678                 schedule_delayed_work(&dev->buttons_query_work,
 679                                       msecs_to_jiffies(dev->button_polling_interval));
 680         }
 681 }
 682
 683 static void em28xx_shutdown_buttons(struct em28xx *dev)
 684 {
 685         /* Cancel polling */
 686         cancel_delayed_work_sync(&dev->buttons_query_work);
 687         /* Clear polling addresses list */
 688         dev->num_button_polling_addresses = 0;
 689         /* Deregister input devices */
 690         if (dev->sbutton_input_dev) {
 691                 dev_info(&dev->intf->dev, "Deregistering snapshot button\n");
 692                 input_unregister_device(dev->sbutton_input_dev);
 693                 dev->sbutton_input_dev = NULL;
 694         }
 695 }
 696
 697 static int em28xx_ir_init(struct em28xx *dev)
 698 {
 699         struct usb_device *udev = interface_to_usbdev(dev->intf);
 700         struct em28xx_IR *ir;
 701         struct rc_dev *rc;
 702         int err = -ENOMEM;
 703         u64 rc_proto;
 704         u16 i2c_rc_dev_addr = 0;
 705
 706         if (dev->is_audio_only) {
 707                 /* Shouldn't initialize IR for this interface */
 708                 return 0;
 709         }
 710
 711         kref_get(&dev->ref);
 712         INIT_DELAYED_WORK(&dev->buttons_query_work, em28xx_query_buttons);
 713
 714         if (dev->board.buttons)
 715                 em28xx_init_buttons(dev);
 716
 717         if (dev->board.has_ir_i2c) {
 718                 i2c_rc_dev_addr = em28xx_probe_i2c_ir(dev);
 719                 if (!i2c_rc_dev_addr) {
 720                         dev->board.has_ir_i2c = 0;
 721                         dev_warn(&dev->intf->dev,
 722                                  "No i2c IR remote control device found.\n");
 723                         return -ENODEV;
 724                 }
 725         }
 726
 727         if (!dev->board.ir_codes && !dev->board.has_ir_i2c) {
 728                 /* No remote control support */
 729                 dev_warn(&dev->intf->dev,
 730                          "Remote control support is not available for this card.\n");
 731                 return 0;
 732         }
 733
 734         dev_info(&dev->intf->dev, "Registering input extension\n");
 735
 736         ir = kzalloc(sizeof(*ir), GFP_KERNEL);
 737         if (!ir)
 738                 return -ENOMEM;
 739         rc = rc_allocate_device(RC_DRIVER_SCANCODE);
 740         if (!rc)
 741                 goto error;
 742
 743         /* record handles to ourself */
 744         ir->dev = dev;
 745         dev->ir = ir;
 746         ir->rc = rc;
 747
 748         rc->priv = ir;
 749         rc->open = em28xx_ir_start;
 750         rc->close = em28xx_ir_stop;
 751
 752         if (dev->board.has_ir_i2c) {    /* external i2c device */
 753                 switch (dev->model) {
 754                 case EM2800_BOARD_TERRATEC_CINERGY_200:
 755                 case EM2820_BOARD_TERRATEC_CINERGY_250:
 756                         rc->map_name = RC_MAP_EM_TERRATEC;
 757                         ir->get_key_i2c = em28xx_get_key_terratec;
 758                         break;
 759                 case EM2820_BOARD_PINNACLE_USB_2:
 760                         rc->map_name = RC_MAP_PINNACLE_GREY;
 761                         ir->get_key_i2c = em28xx_get_key_pinnacle_usb_grey;
 762                         break;
 763                 case EM2820_BOARD_HAUPPAUGE_WINTV_USB_2:
 764                         rc->map_name = RC_MAP_HAUPPAUGE;
 765                         ir->get_key_i2c = em28xx_get_key_em_haup;
 766                         rc->allowed_protocols = RC_PROTO_BIT_RC5;
 767                         break;
 768                 case EM2820_BOARD_LEADTEK_WINFAST_USBII_DELUXE:
 769                         rc->map_name = RC_MAP_WINFAST_USBII_DELUXE;
 770                         ir->get_key_i2c = em28xx_get_key_winfast_usbii_deluxe;
 771                         break;
 772                 default:
 773                         err = -ENODEV;
 774                         goto error;
 775                 }
 776
 777                 ir->i2c_client = kzalloc(sizeof(*ir->i2c_client), GFP_KERNEL);
 778                 if (!ir->i2c_client)
 779                         goto error;
 780                 ir->i2c_client->adapter = &ir->dev->i2c_adap[dev->def_i2c_bus];
 781                 ir->i2c_client->addr = i2c_rc_dev_addr;
 782                 ir->i2c_client->flags = 0;
 783                 /* NOTE: all other fields of i2c_client are unused */
 784         } else {        /* internal device */
 785                 switch (dev->chip_id) {
 786                 case CHIP_ID_EM2860:
 787                 case CHIP_ID_EM2883:
 788                         rc->allowed_protocols = RC_PROTO_BIT_RC5 |
 789                                                 RC_PROTO_BIT_NEC;
 790                         ir->get_key = default_polling_getkey;
 791                         break;
 792                 case CHIP_ID_EM2884:
 793                 case CHIP_ID_EM2874:
 794                 case CHIP_ID_EM28174:
 795                 case CHIP_ID_EM28178:
 796                         ir->get_key = em2874_polling_getkey;
 797                         rc->allowed_protocols = RC_PROTO_BIT_RC5 |
 798                                 RC_PROTO_BIT_NEC | RC_PROTO_BIT_NECX |
 799                                 RC_PROTO_BIT_NEC32 | RC_PROTO_BIT_RC6_0;
 800                         break;
 801                 default:
 802                         err = -ENODEV;
 803                         goto error;
 804                 }
 805
 806                 rc->change_protocol = em28xx_ir_change_protocol;
 807                 rc->map_name = dev->board.ir_codes;
 808
 809                 /* By default, keep protocol field untouched */
 810                 rc_proto = RC_PROTO_BIT_UNKNOWN;
 811                 err = em28xx_ir_change_protocol(rc, &rc_proto);
 812                 if (err)
 813                         goto error;
 814         }
 815
 816         /* This is how often we ask the chip for IR information */
 817         ir->polling = 100; /* ms */
 818
 819         usb_make_path(udev, ir->phys, sizeof(ir->phys));
 820         strlcat(ir->phys, "/input0", sizeof(ir->phys));
 821
 822         rc->device_name = em28xx_boards[dev->model].name;
 823         rc->input_phys = ir->phys;
 824         usb_to_input_id(udev, &rc->input_id);
 825         rc->dev.parent = &dev->intf->dev;
 826         rc->driver_name = MODULE_NAME;
 827
 828         /* all done */
 829         err = rc_register_device(rc);
 830         if (err)
 831                 goto error;
 832
 833         dev_info(&dev->intf->dev, "Input extension successfully initialized\n");
 834
 835         return 0;
 836
 837 error:
 838         kfree(ir->i2c_client);
 839         dev->ir = NULL;
 840         rc_free_device(rc);
 841         kfree(ir);
 842         return err;
 843 }
 844
 845 static int em28xx_ir_fini(struct em28xx *dev)
 846 {
 847         struct em28xx_IR *ir = dev->ir;
 848
 849         if (dev->is_audio_only) {
 850                 /* Shouldn't initialize IR for this interface */
 851                 return 0;
 852         }
 853
 854         dev_info(&dev->intf->dev, "Closing input extension\n");
 855
 856         em28xx_shutdown_buttons(dev);
 857
 858         /* skip detach on non attached boards */
 859         if (!ir)
 860                 goto ref_put;
 861
 862         rc_unregister_device(ir->rc);
 863
 864         kfree(ir->i2c_client);
 865
 866         /* done */
 867         kfree(ir);
 868         dev->ir = NULL;
 869
 870 ref_put:
 871         kref_put(&dev->ref, em28xx_free_device);
 872
 873         return 0;
 874 }
 875
 876 static int em28xx_ir_suspend(struct em28xx *dev)
 877 {
 878         struct em28xx_IR *ir = dev->ir;
 879
 880         if (dev->is_audio_only)
 881                 return 0;
 882
 883         dev_info(&dev->intf->dev, "Suspending input extension\n");
 884         if (ir)
 885                 cancel_delayed_work_sync(&ir->work);
 886         cancel_delayed_work_sync(&dev->buttons_query_work);
 887         /*
 888          * is canceling delayed work sufficient or does the rc event
 889          * kthread needs stopping? kthread is stopped in
 890          * ir_raw_event_unregister()
 891          */
 892         return 0;
 893 }
 894
 895 static int em28xx_ir_resume(struct em28xx *dev)
 896 {
 897         struct em28xx_IR *ir = dev->ir;
 898
 899         if (dev->is_audio_only)
 900                 return 0;
 901
 902         dev_info(&dev->intf->dev, "Resuming input extension\n");
 903         /*
 904          * if suspend calls ir_raw_event_unregister(), the should call
 905          * ir_raw_event_register()
 906          */
 907         if (ir)
 908                 schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling));
 909         if (dev->num_button_polling_addresses)
 910                 schedule_delayed_work(&dev->buttons_query_work,
 911                                       msecs_to_jiffies(dev->button_polling_interval));
 912         return 0;
 913 }
 914
 915 static struct em28xx_ops rc_ops = {
 916         .id   = EM28XX_RC,
 917         .name = "Em28xx Input Extension",
 918         .init = em28xx_ir_init,
 919         .fini = em28xx_ir_fini,
 920         .suspend = em28xx_ir_suspend,
 921         .resume = em28xx_ir_resume,
 922 };
 923
 924 static int __init em28xx_rc_register(void)
 925 {
 926         return em28xx_register_extension(&rc_ops);
 927 }
 928
 929 static void __exit em28xx_rc_unregister(void)
 930 {
 931         em28xx_unregister_extension(&rc_ops);
 932 }
 933
 934 MODULE_LICENSE("GPL v2");
 935 MODULE_AUTHOR("Mauro Carvalho Chehab");
 936 MODULE_DESCRIPTION(DRIVER_DESC " - input interface");
 937 MODULE_VERSION(EM28XX_VERSION);
 938
 939 module_init(em28xx_rc_register);
 940 module_exit(em28xx_rc_unregister);