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 "em28xx.h"
  25
  26 #include <linux/module.h>
  27 #include <linux/init.h>
  28 #include <linux/delay.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/usb.h>
  31 #include <linux/slab.h>
  32 #include <linux/bitrev.h>
  33
  34 #define EM28XX_SNAPSHOT_KEY                             KEY_CAMERA
  35 #define EM28XX_BUTTONS_DEBOUNCED_QUERY_INTERVAL         500 /* [ms] */
  36 #define EM28XX_BUTTONS_VOLATILE_QUERY_INTERVAL          100 /* [ms] */
  37
  38 static unsigned int ir_debug;
  39 module_param(ir_debug, int, 0644);
  40 MODULE_PARM_DESC(ir_debug, "enable debug messages [IR]");
  41
  42 #define MODULE_NAME "em28xx"
  43
  44 #define dprintk( fmt, arg...) do {                                      \
  45         if (ir_debug)                                                   \
  46                 dev_printk(KERN_DEBUG, &ir->dev->intf->dev,             \
  47                            "input: %s: " fmt, __func__, ## arg);        \
  48 } while (0)
  49
  50 /**********************************************************
  51  Polling structure used by em28xx IR's
  52  **********************************************************/
  53
  54 struct em28xx_ir_poll_result {
  55         unsigned int toggle_bit:1;
  56         unsigned int read_count:7;
  57
  58         enum rc_proto protocol;
  59         u32 scancode;
  60 };
  61
  62 struct em28xx_IR {
  63         struct em28xx *dev;
  64         struct rc_dev *rc;
  65         char name[32];
  66         char phys[32];
  67
  68         /* poll decoder */
  69         int polling;
  70         struct delayed_work work;
  71         unsigned int full_code:1;
  72         unsigned int last_readcount;
  73         u64 rc_proto;
  74
  75         struct i2c_client *i2c_client;
  76
  77         int  (*get_key_i2c)(struct i2c_client *ir, enum rc_proto *protocol,
  78                             u32 *scancode);
  79         int  (*get_key)(struct em28xx_IR *, struct em28xx_ir_poll_result *);
  80 };
  81
  82 /**********************************************************
  83  I2C IR based get keycodes - should be used with ir-kbd-i2c
  84  **********************************************************/
  85
  86 static int em28xx_get_key_terratec(struct i2c_client *i2c_dev,
  87                                    enum rc_proto *protocol, u32 *scancode)
  88 {
  89         unsigned char b;
  90
  91         /* poll IR chip */
  92         if (1 != i2c_master_recv(i2c_dev, &b, 1))
  93                 return -EIO;
  94
  95         /* it seems that 0xFE indicates that a button is still hold
  96            down, while 0xff indicates that no button is hold down. */
  97
  98         if (b == 0xff)
  99                 return 0;
 100
 101         if (b == 0xfe)
 102                 /* keep old data */
 103                 return 1;
 104
 105         *protocol = RC_PROTO_UNKNOWN;
 106         *scancode = b;
 107         return 1;
 108 }
 109
 110 static int em28xx_get_key_em_haup(struct i2c_client *i2c_dev,
 111                                   enum rc_proto *protocol, u32 *scancode)
 112 {
 113         unsigned char buf[2];
 114         int size;
 115
 116         /* poll IR chip */
 117         size = i2c_master_recv(i2c_dev, buf, sizeof(buf));
 118
 119         if (size != 2)
 120                 return -EIO;
 121
 122         /* Does eliminate repeated parity code */
 123         if (buf[1] == 0xff)
 124                 return 0;
 125
 126         /*
 127          * Rearranges bits to the right order.
 128          * The bit order were determined experimentally by using
 129          * The original Hauppauge Grey IR and another RC5 that uses addr=0x08
 130          * The RC5 code has 14 bits, but we've experimentally determined
 131          * the meaning for only 11 bits.
 132          * So, the code translation is not complete. Yet, it is enough to
 133          * work with the provided RC5 IR.
 134          */
 135         *protocol = RC_PROTO_RC5;
 136         *scancode = (bitrev8(buf[1]) & 0x1f) << 8 | bitrev8(buf[0]) >> 2;
 137         return 1;
 138 }
 139
 140 static int em28xx_get_key_pinnacle_usb_grey(struct i2c_client *i2c_dev,
 141                                             enum rc_proto *protocol,
 142                                             u32 *scancode)
 143 {
 144         unsigned char buf[3];
 145
 146         /* poll IR chip */
 147
 148         if (3 != i2c_master_recv(i2c_dev, buf, 3))
 149                 return -EIO;
 150
 151         if (buf[0] != 0x00)
 152                 return 0;
 153
 154         *protocol = RC_PROTO_UNKNOWN;
 155         *scancode = buf[2] & 0x3f;
 156         return 1;
 157 }
 158
 159 static int em28xx_get_key_winfast_usbii_deluxe(struct i2c_client *i2c_dev,
 160                                                enum rc_proto *protocol,
 161                                                u32 *scancode)
 162 {
 163         unsigned char subaddr, keydetect, key;
 164
 165         struct i2c_msg msg[] = { { .addr = i2c_dev->addr, .flags = 0, .buf = &subaddr, .len = 1},
 166                                  { .addr = i2c_dev->addr, .flags = I2C_M_RD, .buf = &keydetect, .len = 1} };
 167
 168         subaddr = 0x10;
 169         if (2 != i2c_transfer(i2c_dev->adapter, msg, 2))
 170                 return -EIO;
 171         if (keydetect == 0x00)
 172                 return 0;
 173
 174         subaddr = 0x00;
 175         msg[1].buf = &key;
 176         if (2 != i2c_transfer(i2c_dev->adapter, msg, 2))
 177                 return -EIO;
 178         if (key == 0x00)
 179                 return 0;
 180
 181         *protocol = RC_PROTO_UNKNOWN;
 182         *scancode = key;
 183         return 1;
 184 }
 185
 186 /**********************************************************
 187  Poll based get keycode functions
 188  **********************************************************/
 189
 190 /* This is for the em2860/em2880 */
 191 static int default_polling_getkey(struct em28xx_IR *ir,
 192                                   struct em28xx_ir_poll_result *poll_result)
 193 {
 194         struct em28xx *dev = ir->dev;
 195         int rc;
 196         u8 msg[3] = { 0, 0, 0 };
 197
 198         /* Read key toggle, brand, and key code
 199            on registers 0x45, 0x46 and 0x47
 200          */
 201         rc = dev->em28xx_read_reg_req_len(dev, 0, EM28XX_R45_IR,
 202                                           msg, sizeof(msg));
 203         if (rc < 0)
 204                 return rc;
 205
 206         /* Infrared toggle (Reg 0x45[7]) */
 207         poll_result->toggle_bit = (msg[0] >> 7);
 208
 209         /* Infrared read count (Reg 0x45[6:0] */
 210         poll_result->read_count = (msg[0] & 0x7f);
 211
 212         /* Remote Control Address/Data (Regs 0x46/0x47) */
 213         switch (ir->rc_proto) {
 214         case RC_PROTO_BIT_RC5:
 215                 poll_result->protocol = RC_PROTO_RC5;
 216                 poll_result->scancode = RC_SCANCODE_RC5(msg[1], msg[2]);
 217                 break;
 218
 219         case RC_PROTO_BIT_NEC:
 220                 poll_result->protocol = RC_PROTO_NEC;
 221                 poll_result->scancode = RC_SCANCODE_NEC(msg[1], msg[2]);
 222                 break;
 223
 224         default:
 225                 poll_result->protocol = RC_PROTO_UNKNOWN;
 226                 poll_result->scancode = msg[1] << 8 | msg[2];
 227                 break;
 228         }
 229
 230         return 0;
 231 }
 232
 233 static int em2874_polling_getkey(struct em28xx_IR *ir,
 234                                  struct em28xx_ir_poll_result *poll_result)
 235 {
 236         struct em28xx *dev = ir->dev;
 237         int rc;
 238         u8 msg[5] = { 0, 0, 0, 0, 0 };
 239
 240         /* Read key toggle, brand, and key code
 241            on registers 0x51-55
 242          */
 243         rc = dev->em28xx_read_reg_req_len(dev, 0, EM2874_R51_IR,
 244                                           msg, sizeof(msg));
 245         if (rc < 0)
 246                 return rc;
 247
 248         /* Infrared toggle (Reg 0x51[7]) */
 249         poll_result->toggle_bit = (msg[0] >> 7);
 250
 251         /* Infrared read count (Reg 0x51[6:0] */
 252         poll_result->read_count = (msg[0] & 0x7f);
 253
 254         /*
 255          * Remote Control Address (Reg 0x52)
 256          * Remote Control Data (Reg 0x53-0x55)
 257          */
 258         switch (ir->rc_proto) {
 259         case RC_PROTO_BIT_RC5:
 260                 poll_result->protocol = RC_PROTO_RC5;
 261                 poll_result->scancode = RC_SCANCODE_RC5(msg[1], msg[2]);
 262                 break;
 263
 264         case RC_PROTO_BIT_NEC:
 265                 poll_result->scancode = msg[1] << 8 | msg[2];
 266                 if ((msg[3] ^ msg[4]) != 0xff) {        /* 32 bits NEC */
 267                         poll_result->protocol = RC_PROTO_NEC32;
 268                         poll_result->scancode = RC_SCANCODE_NEC32((msg[1] << 24) |
 269                                                                   (msg[2] << 16) |
 270                                                                   (msg[3] << 8)  |
 271                                                                   (msg[4]));
 272                 } else if ((msg[1] ^ msg[2]) != 0xff) { /* 24 bits NEC */
 273                         poll_result->protocol = RC_PROTO_NECX;
 274                         poll_result->scancode = RC_SCANCODE_NECX(msg[1] << 8 |
 275                                                                  msg[2], msg[3]);
 276                 } else {                                /* Normal NEC */
 277                         poll_result->protocol = RC_PROTO_NEC;
 278                         poll_result->scancode = RC_SCANCODE_NEC(msg[1], msg[3]);
 279                 }
 280                 break;
 281
 282         case RC_PROTO_BIT_RC6_0:
 283                 poll_result->protocol = RC_PROTO_RC6_0;
 284                 poll_result->scancode = RC_SCANCODE_RC6_0(msg[1], msg[2]);
 285                 break;
 286
 287         default:
 288                 poll_result->protocol = RC_PROTO_UNKNOWN;
 289                 poll_result->scancode = (msg[1] << 24) | (msg[2] << 16) |
 290                                         (msg[3] << 8)  | msg[4];
 291                 break;
 292         }
 293
 294         return 0;
 295 }
 296
 297 /**********************************************************
 298  Polling code for em28xx
 299  **********************************************************/
 300
 301 static int em28xx_i2c_ir_handle_key(struct em28xx_IR *ir)
 302 {
 303         static u32 scancode;
 304         enum rc_proto protocol;
 305         int rc;
 306
 307         rc = ir->get_key_i2c(ir->i2c_client, &protocol, &scancode);
 308         if (rc < 0) {
 309                 dprintk("ir->get_key_i2c() failed: %d\n", rc);
 310                 return rc;
 311         }
 312
 313         if (rc) {
 314                 dprintk("%s: proto = 0x%04x, scancode = 0x%04x\n",
 315                         __func__, protocol, scancode);
 316                 rc_keydown(ir->rc, protocol, scancode, 0);
 317         }
 318         return 0;
 319 }
 320
 321 static void em28xx_ir_handle_key(struct em28xx_IR *ir)
 322 {
 323         int result;
 324         struct em28xx_ir_poll_result poll_result;
 325
 326         /* read the registers containing the IR status */
 327         result = ir->get_key(ir, &poll_result);
 328         if (unlikely(result < 0)) {
 329                 dprintk("ir->get_key() failed: %d\n", result);
 330                 return;
 331         }
 332
 333         if (unlikely(poll_result.read_count != ir->last_readcount)) {
 334                 dprintk("%s: toggle: %d, count: %d, key 0x%04x\n", __func__,
 335                         poll_result.toggle_bit, poll_result.read_count,
 336                         poll_result.scancode);
 337                 if (ir->full_code)
 338                         rc_keydown(ir->rc,
 339                                    poll_result.protocol,
 340                                    poll_result.scancode,
 341                                    poll_result.toggle_bit);
 342                 else
 343                         rc_keydown(ir->rc,
 344                                    RC_PROTO_UNKNOWN,
 345                                    poll_result.scancode & 0xff,
 346                                    poll_result.toggle_bit);
 347
 348                 if (ir->dev->chip_id == CHIP_ID_EM2874 ||
 349                     ir->dev->chip_id == CHIP_ID_EM2884)
 350                         /* The em2874 clears the readcount field every time the
 351                            register is read.  The em2860/2880 datasheet says that it
 352                            is supposed to clear the readcount, but it doesn't.  So with
 353                            the em2874, we are looking for a non-zero read count as
 354                            opposed to a readcount that is incrementing */
 355                         ir->last_readcount = 0;
 356                 else
 357                         ir->last_readcount = poll_result.read_count;
 358         }
 359 }
 360
 361 static void em28xx_ir_work(struct work_struct *work)
 362 {
 363         struct em28xx_IR *ir = container_of(work, struct em28xx_IR, work.work);
 364
 365         if (ir->i2c_client) /* external i2c device */
 366                 em28xx_i2c_ir_handle_key(ir);
 367         else /* internal device */
 368                 em28xx_ir_handle_key(ir);
 369         schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling));
 370 }
 371
 372 static int em28xx_ir_start(struct rc_dev *rc)
 373 {
 374         struct em28xx_IR *ir = rc->priv;
 375
 376         INIT_DELAYED_WORK(&ir->work, em28xx_ir_work);
 377         schedule_delayed_work(&ir->work, 0);
 378
 379         return 0;
 380 }
 381
 382 static void em28xx_ir_stop(struct rc_dev *rc)
 383 {
 384         struct em28xx_IR *ir = rc->priv;
 385
 386         cancel_delayed_work_sync(&ir->work);
 387 }
 388
 389 static int em2860_ir_change_protocol(struct rc_dev *rc_dev, u64 *rc_proto)
 390 {
 391         struct em28xx_IR *ir = rc_dev->priv;
 392         struct em28xx *dev = ir->dev;
 393
 394         /* Adjust xclk based on IR table for RC5/NEC tables */
 395         if (*rc_proto & RC_PROTO_BIT_RC5) {
 396                 dev->board.xclk |= EM28XX_XCLK_IR_RC5_MODE;
 397                 ir->full_code = 1;
 398                 *rc_proto = RC_PROTO_BIT_RC5;
 399         } else if (*rc_proto & RC_PROTO_BIT_NEC) {
 400                 dev->board.xclk &= ~EM28XX_XCLK_IR_RC5_MODE;
 401                 ir->full_code = 1;
 402                 *rc_proto = RC_PROTO_BIT_NEC;
 403         } else if (*rc_proto & RC_PROTO_BIT_UNKNOWN) {
 404                 *rc_proto = RC_PROTO_BIT_UNKNOWN;
 405         } else {
 406                 *rc_proto = ir->rc_proto;
 407                 return -EINVAL;
 408         }
 409         em28xx_write_reg_bits(dev, EM28XX_R0F_XCLK, dev->board.xclk,
 410                               EM28XX_XCLK_IR_RC5_MODE);
 411
 412         ir->rc_proto = *rc_proto;
 413
 414         return 0;
 415 }
 416
 417 static int em2874_ir_change_protocol(struct rc_dev *rc_dev, u64 *rc_proto)
 418 {
 419         struct em28xx_IR *ir = rc_dev->priv;
 420         struct em28xx *dev = ir->dev;
 421         u8 ir_config = EM2874_IR_RC5;
 422
 423         /* Adjust xclk and set type based on IR table for RC5/NEC/RC6 tables */
 424         if (*rc_proto & RC_PROTO_BIT_RC5) {
 425                 dev->board.xclk |= EM28XX_XCLK_IR_RC5_MODE;
 426                 ir->full_code = 1;
 427                 *rc_proto = RC_PROTO_BIT_RC5;
 428         } else if (*rc_proto & RC_PROTO_BIT_NEC) {
 429                 dev->board.xclk &= ~EM28XX_XCLK_IR_RC5_MODE;
 430                 ir_config = EM2874_IR_NEC | EM2874_IR_NEC_NO_PARITY;
 431                 ir->full_code = 1;
 432                 *rc_proto = RC_PROTO_BIT_NEC;
 433         } else if (*rc_proto & RC_PROTO_BIT_RC6_0) {
 434                 dev->board.xclk |= EM28XX_XCLK_IR_RC5_MODE;
 435                 ir_config = EM2874_IR_RC6_MODE_0;
 436                 ir->full_code = 1;
 437                 *rc_proto = RC_PROTO_BIT_RC6_0;
 438         } else if (*rc_proto & RC_PROTO_BIT_UNKNOWN) {
 439                 *rc_proto = RC_PROTO_BIT_UNKNOWN;
 440         } else {
 441                 *rc_proto = ir->rc_proto;
 442                 return -EINVAL;
 443         }
 444         em28xx_write_regs(dev, EM2874_R50_IR_CONFIG, &ir_config, 1);
 445         em28xx_write_reg_bits(dev, EM28XX_R0F_XCLK, dev->board.xclk,
 446                               EM28XX_XCLK_IR_RC5_MODE);
 447
 448         ir->rc_proto = *rc_proto;
 449
 450         return 0;
 451 }
 452
 453 static int em28xx_ir_change_protocol(struct rc_dev *rc_dev, u64 *rc_proto)
 454 {
 455         struct em28xx_IR *ir = rc_dev->priv;
 456         struct em28xx *dev = ir->dev;
 457
 458         /* Setup the proper handler based on the chip */
 459         switch (dev->chip_id) {
 460         case CHIP_ID_EM2860:
 461         case CHIP_ID_EM2883:
 462                 return em2860_ir_change_protocol(rc_dev, rc_proto);
 463         case CHIP_ID_EM2884:
 464         case CHIP_ID_EM2874:
 465         case CHIP_ID_EM28174:
 466         case CHIP_ID_EM28178:
 467                 return em2874_ir_change_protocol(rc_dev, rc_proto);
 468         default:
 469                 dev_err(&ir->dev->intf->dev,
 470                         "Unrecognized em28xx chip id 0x%02x: IR not supported\n",
 471                         dev->chip_id);
 472                 return -EINVAL;
 473         }
 474 }
 475
 476 static int em28xx_probe_i2c_ir(struct em28xx *dev)
 477 {
 478         int i = 0;
 479         /* Leadtek winfast tv USBII deluxe can find a non working IR-device */
 480         /* at address 0x18, so if that address is needed for another board in */
 481         /* the future, please put it after 0x1f. */
 482         const unsigned short addr_list[] = {
 483                  0x1f, 0x30, 0x47, I2C_CLIENT_END
 484         };
 485
 486         while (addr_list[i] != I2C_CLIENT_END) {
 487                 if (i2c_probe_func_quick_read(&dev->i2c_adap[dev->def_i2c_bus], addr_list[i]) == 1)
 488                         return addr_list[i];
 489                 i++;
 490         }
 491
 492         return -ENODEV;
 493 }
 494
 495 /**********************************************************
 496  Handle buttons
 497  **********************************************************/
 498
 499 static void em28xx_query_buttons(struct work_struct *work)
 500 {
 501         struct em28xx *dev =
 502                 container_of(work, struct em28xx, buttons_query_work.work);
 503         u8 i, j;
 504         int regval;
 505         bool is_pressed, was_pressed;
 506         const struct em28xx_led *led;
 507
 508         /* Poll and evaluate all addresses */
 509         for (i = 0; i < dev->num_button_polling_addresses; i++) {
 510                 /* Read value from register */
 511                 regval = em28xx_read_reg(dev, dev->button_polling_addresses[i]);
 512                 if (regval < 0)
 513                         continue;
 514                 /* Check states of the buttons and act */
 515                 j = 0;
 516                 while (dev->board.buttons[j].role >= 0 &&
 517                        dev->board.buttons[j].role < EM28XX_NUM_BUTTON_ROLES) {
 518                         struct em28xx_button *button = &dev->board.buttons[j];
 519                         /* Check if button uses the current address */
 520                         if (button->reg_r != dev->button_polling_addresses[i]) {
 521                                 j++;
 522                                 continue;
 523                         }
 524                         /* Determine if button is and was pressed last time */
 525                         is_pressed = regval & button->mask;
 526                         was_pressed = dev->button_polling_last_values[i]
 527                                        & button->mask;
 528                         if (button->inverted) {
 529                                 is_pressed = !is_pressed;
 530                                 was_pressed = !was_pressed;
 531                         }
 532                         /* Clear button state (if needed) */
 533                         if (is_pressed && button->reg_clearing)
 534                                 em28xx_write_reg(dev, button->reg_clearing,
 535                                                  (~regval & button->mask)
 536                                                     | (regval & ~button->mask));
 537                         /* Handle button state */
 538                         if (!is_pressed || was_pressed) {
 539                                 j++;
 540                                 continue;
 541                         }
 542                         switch (button->role) {
 543                         case EM28XX_BUTTON_SNAPSHOT:
 544                                 /* Emulate the keypress */
 545                                 input_report_key(dev->sbutton_input_dev,
 546                                                  EM28XX_SNAPSHOT_KEY, 1);
 547                                 /* Unpress the key */
 548                                 input_report_key(dev->sbutton_input_dev,
 549                                                  EM28XX_SNAPSHOT_KEY, 0);
 550                                 break;
 551                         case EM28XX_BUTTON_ILLUMINATION:
 552                                 led = em28xx_find_led(dev,
 553                                                       EM28XX_LED_ILLUMINATION);
 554                                 /* Switch illumination LED on/off */
 555                                 if (led)
 556                                         em28xx_toggle_reg_bits(dev,
 557                                                                led->gpio_reg,
 558                                                                led->gpio_mask);
 559                                 break;
 560                         default:
 561                                 WARN_ONCE(1, "BUG: unhandled button role.");
 562                         }
 563                         /* Next button */
 564                         j++;
 565                 }
 566                 /* Save current value for comparison during the next polling */
 567                 dev->button_polling_last_values[i] = regval;
 568         }
 569         /* Schedule next poll */
 570         schedule_delayed_work(&dev->buttons_query_work,
 571                               msecs_to_jiffies(dev->button_polling_interval));
 572 }
 573
 574 static int em28xx_register_snapshot_button(struct em28xx *dev)
 575 {
 576         struct usb_device *udev = interface_to_usbdev(dev->intf);
 577         struct input_dev *input_dev;
 578         int err;
 579
 580         dev_info(&dev->intf->dev, "Registering snapshot button...\n");
 581         input_dev = input_allocate_device();
 582         if (!input_dev)
 583                 return -ENOMEM;
 584
 585         usb_make_path(udev, dev->snapshot_button_path,
 586                       sizeof(dev->snapshot_button_path));
 587         strlcat(dev->snapshot_button_path, "/sbutton",
 588                 sizeof(dev->snapshot_button_path));
 589
 590         input_dev->name = "em28xx snapshot button";
 591         input_dev->phys = dev->snapshot_button_path;
 592         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
 593         set_bit(EM28XX_SNAPSHOT_KEY, input_dev->keybit);
 594         input_dev->keycodesize = 0;
 595         input_dev->keycodemax = 0;
 596         input_dev->id.bustype = BUS_USB;
 597         input_dev->id.vendor = le16_to_cpu(udev->descriptor.idVendor);
 598         input_dev->id.product = le16_to_cpu(udev->descriptor.idProduct);
 599         input_dev->id.version = 1;
 600         input_dev->dev.parent = &dev->intf->dev;
 601
 602         err = input_register_device(input_dev);
 603         if (err) {
 604                 dev_err(&dev->intf->dev, "input_register_device failed\n");
 605                 input_free_device(input_dev);
 606                 return err;
 607         }
 608
 609         dev->sbutton_input_dev = input_dev;
 610         return 0;
 611 }
 612
 613 static void em28xx_init_buttons(struct em28xx *dev)
 614 {
 615         u8  i = 0, j = 0;
 616         bool addr_new = false;
 617
 618         dev->button_polling_interval = EM28XX_BUTTONS_DEBOUNCED_QUERY_INTERVAL;
 619         while (dev->board.buttons[i].role >= 0 &&
 620                dev->board.buttons[i].role < EM28XX_NUM_BUTTON_ROLES) {
 621                 struct em28xx_button *button = &dev->board.buttons[i];
 622                 /* Check if polling address is already on the list */
 623                 addr_new = true;
 624                 for (j = 0; j < dev->num_button_polling_addresses; j++) {
 625                         if (button->reg_r == dev->button_polling_addresses[j]) {
 626                                 addr_new = false;
 627                                 break;
 628                         }
 629                 }
 630                 /* Check if max. number of polling addresses is exceeded */
 631                 if (addr_new && dev->num_button_polling_addresses
 632                                            >= EM28XX_NUM_BUTTON_ADDRESSES_MAX) {
 633                         WARN_ONCE(1, "BUG: maximum number of button polling addresses exceeded.");
 634                         goto next_button;
 635                 }
 636                 /* Button role specific checks and actions */
 637                 if (button->role == EM28XX_BUTTON_SNAPSHOT) {
 638                         /* Register input device */
 639                         if (em28xx_register_snapshot_button(dev) < 0)
 640                                 goto next_button;
 641                 } else if (button->role == EM28XX_BUTTON_ILLUMINATION) {
 642                         /* Check sanity */
 643                         if (!em28xx_find_led(dev, EM28XX_LED_ILLUMINATION)) {
 644                                 dev_err(&dev->intf->dev,
 645                                         "BUG: illumination button defined, but no illumination LED.\n");
 646                                 goto next_button;
 647                         }
 648                 }
 649                 /* Add read address to list of polling addresses */
 650                 if (addr_new) {
 651                         unsigned int index = dev->num_button_polling_addresses;
 652                         dev->button_polling_addresses[index] = button->reg_r;
 653                         dev->num_button_polling_addresses++;
 654                 }
 655                 /* Reduce polling interval if necessary */
 656                 if (!button->reg_clearing)
 657                         dev->button_polling_interval =
 658                                          EM28XX_BUTTONS_VOLATILE_QUERY_INTERVAL;
 659 next_button:
 660                 /* Next button */
 661                 i++;
 662         }
 663
 664         /* Start polling */
 665         if (dev->num_button_polling_addresses) {
 666                 memset(dev->button_polling_last_values, 0,
 667                        EM28XX_NUM_BUTTON_ADDRESSES_MAX);
 668                 schedule_delayed_work(&dev->buttons_query_work,
 669                                       msecs_to_jiffies(dev->button_polling_interval));
 670         }
 671 }
 672
 673 static void em28xx_shutdown_buttons(struct em28xx *dev)
 674 {
 675         /* Cancel polling */
 676         cancel_delayed_work_sync(&dev->buttons_query_work);
 677         /* Clear polling addresses list */
 678         dev->num_button_polling_addresses = 0;
 679         /* Deregister input devices */
 680         if (dev->sbutton_input_dev != NULL) {
 681                 dev_info(&dev->intf->dev, "Deregistering snapshot button\n");
 682                 input_unregister_device(dev->sbutton_input_dev);
 683                 dev->sbutton_input_dev = NULL;
 684         }
 685 }
 686
 687 static int em28xx_ir_init(struct em28xx *dev)
 688 {
 689         struct usb_device *udev = interface_to_usbdev(dev->intf);
 690         struct em28xx_IR *ir;
 691         struct rc_dev *rc;
 692         int err = -ENOMEM;
 693         u64 rc_proto;
 694         u16 i2c_rc_dev_addr = 0;
 695
 696         if (dev->is_audio_only) {
 697                 /* Shouldn't initialize IR for this interface */
 698                 return 0;
 699         }
 700
 701         kref_get(&dev->ref);
 702         INIT_DELAYED_WORK(&dev->buttons_query_work, em28xx_query_buttons);
 703
 704         if (dev->board.buttons)
 705                 em28xx_init_buttons(dev);
 706
 707         if (dev->board.has_ir_i2c) {
 708                 i2c_rc_dev_addr = em28xx_probe_i2c_ir(dev);
 709                 if (!i2c_rc_dev_addr) {
 710                         dev->board.has_ir_i2c = 0;
 711                         dev_warn(&dev->intf->dev,
 712                                  "No i2c IR remote control device found.\n");
 713                         err = -ENODEV;
 714                         goto ref_put;
 715                 }
 716         }
 717
 718         if (dev->board.ir_codes == NULL && !dev->board.has_ir_i2c) {
 719                 /* No remote control support */
 720                 dev_warn(&dev->intf->dev,
 721                          "Remote control support is not available for this card.\n");
 722                 return 0;
 723         }
 724
 725         dev_info(&dev->intf->dev, "Registering input extension\n");
 726
 727         ir = kzalloc(sizeof(*ir), GFP_KERNEL);
 728         if (!ir)
 729                 goto ref_put;
 730         rc = rc_allocate_device(RC_DRIVER_SCANCODE);
 731         if (!rc)
 732                 goto error;
 733
 734         /* record handles to ourself */
 735         ir->dev = dev;
 736         dev->ir = ir;
 737         ir->rc = rc;
 738
 739         rc->priv = ir;
 740         rc->open = em28xx_ir_start;
 741         rc->close = em28xx_ir_stop;
 742
 743         if (dev->board.has_ir_i2c) {    /* external i2c device */
 744                 switch (dev->model) {
 745                 case EM2800_BOARD_TERRATEC_CINERGY_200:
 746                 case EM2820_BOARD_TERRATEC_CINERGY_250:
 747                         rc->map_name = RC_MAP_EM_TERRATEC;
 748                         ir->get_key_i2c = em28xx_get_key_terratec;
 749                         break;
 750                 case EM2820_BOARD_PINNACLE_USB_2:
 751                         rc->map_name = RC_MAP_PINNACLE_GREY;
 752                         ir->get_key_i2c = em28xx_get_key_pinnacle_usb_grey;
 753                         break;
 754                 case EM2820_BOARD_HAUPPAUGE_WINTV_USB_2:
 755                         rc->map_name = RC_MAP_HAUPPAUGE;
 756                         ir->get_key_i2c = em28xx_get_key_em_haup;
 757                         rc->allowed_protocols = RC_PROTO_BIT_RC5;
 758                         break;
 759                 case EM2820_BOARD_LEADTEK_WINFAST_USBII_DELUXE:
 760                         rc->map_name = RC_MAP_WINFAST_USBII_DELUXE;
 761                         ir->get_key_i2c = em28xx_get_key_winfast_usbii_deluxe;
 762                         break;
 763                 default:
 764                         err = -ENODEV;
 765                         goto error;
 766                 }
 767
 768                 ir->i2c_client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
 769                 if (!ir->i2c_client)
 770                         goto error;
 771                 ir->i2c_client->adapter = &ir->dev->i2c_adap[dev->def_i2c_bus];
 772                 ir->i2c_client->addr = i2c_rc_dev_addr;
 773                 ir->i2c_client->flags = 0;
 774                 /* NOTE: all other fields of i2c_client are unused */
 775         } else {        /* internal device */
 776                 switch (dev->chip_id) {
 777                 case CHIP_ID_EM2860:
 778                 case CHIP_ID_EM2883:
 779                         rc->allowed_protocols = RC_PROTO_BIT_RC5 |
 780                                                 RC_PROTO_BIT_NEC;
 781                         ir->get_key = default_polling_getkey;
 782                         break;
 783                 case CHIP_ID_EM2884:
 784                 case CHIP_ID_EM2874:
 785                 case CHIP_ID_EM28174:
 786                 case CHIP_ID_EM28178:
 787                         ir->get_key = em2874_polling_getkey;
 788                         rc->allowed_protocols = RC_PROTO_BIT_RC5 |
 789                                 RC_PROTO_BIT_NEC | RC_PROTO_BIT_NECX |
 790                                 RC_PROTO_BIT_NEC32 | RC_PROTO_BIT_RC6_0;
 791                         break;
 792                 default:
 793                         err = -ENODEV;
 794                         goto error;
 795                 }
 796
 797                 rc->change_protocol = em28xx_ir_change_protocol;
 798                 rc->map_name = dev->board.ir_codes;
 799
 800                 /* By default, keep protocol field untouched */
 801                 rc_proto = RC_PROTO_BIT_UNKNOWN;
 802                 err = em28xx_ir_change_protocol(rc, &rc_proto);
 803                 if (err)
 804                         goto error;
 805         }
 806
 807         /* This is how often we ask the chip for IR information */
 808         ir->polling = 100; /* ms */
 809
 810         /* init input device */
 811         snprintf(ir->name, sizeof(ir->name), "%s IR",
 812                  dev_name(&dev->intf->dev));
 813
 814         usb_make_path(udev, ir->phys, sizeof(ir->phys));
 815         strlcat(ir->phys, "/input0", sizeof(ir->phys));
 816
 817         rc->device_name = ir->name;
 818         rc->input_phys = ir->phys;
 819         rc->input_id.bustype = BUS_USB;
 820         rc->input_id.version = 1;
 821         rc->input_id.vendor = le16_to_cpu(udev->descriptor.idVendor);
 822         rc->input_id.product = le16_to_cpu(udev->descriptor.idProduct);
 823         rc->dev.parent = &dev->intf->dev;
 824         rc->driver_name = MODULE_NAME;
 825
 826         /* all done */
 827         err = rc_register_device(rc);
 828         if (err)
 829                 goto error;
 830
 831         dev_info(&dev->intf->dev, "Input extension successfully initialized\n");
 832
 833         return 0;
 834
 835 error:
 836         kfree(ir->i2c_client);
 837         dev->ir = NULL;
 838         rc_free_device(rc);
 839         kfree(ir);
 840 ref_put:
 841         em28xx_shutdown_buttons(dev);
 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         /* is canceling delayed work sufficient or does the rc event
 888            kthread needs stopping? kthread is stopped in
 889            ir_raw_event_unregister() */
 890         return 0;
 891 }
 892
 893 static int em28xx_ir_resume(struct em28xx *dev)
 894 {
 895         struct em28xx_IR *ir = dev->ir;
 896
 897         if (dev->is_audio_only)
 898                 return 0;
 899
 900         dev_info(&dev->intf->dev, "Resuming input extension\n");
 901         /* if suspend calls ir_raw_event_unregister(), the should call
 902            ir_raw_event_register() */
 903         if (ir)
 904                 schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling));
 905         if (dev->num_button_polling_addresses)
 906                 schedule_delayed_work(&dev->buttons_query_work,
 907                                       msecs_to_jiffies(dev->button_polling_interval));
 908         return 0;
 909 }
 910
 911 static struct em28xx_ops rc_ops = {
 912         .id   = EM28XX_RC,
 913         .name = "Em28xx Input Extension",
 914         .init = em28xx_ir_init,
 915         .fini = em28xx_ir_fini,
 916         .suspend = em28xx_ir_suspend,
 917         .resume = em28xx_ir_resume,
 918 };
 919
 920 static int __init em28xx_rc_register(void)
 921 {
 922         return em28xx_register_extension(&rc_ops);
 923 }
 924
 925 static void __exit em28xx_rc_unregister(void)
 926 {
 927         em28xx_unregister_extension(&rc_ops);
 928 }
 929
 930 MODULE_LICENSE("GPL");
 931 MODULE_AUTHOR("Mauro Carvalho Chehab");
 932 MODULE_DESCRIPTION(DRIVER_DESC " - input interface");
 933 MODULE_VERSION(EM28XX_VERSION);
 934
 935 module_init(em28xx_rc_register);
 936 module_exit(em28xx_rc_unregister);