linux/drivers/media/usb/em28xx/em28xx-input.c
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   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
  35static unsigned int ir_debug;
  36module_param(ir_debug, int, 0644);
  37MODULE_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
  51struct 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
  59struct 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
  82static 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
 113static 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
 143static 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
 162static 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 */
 204static 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
 247static 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
 303static 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
 323static 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
 366static 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
 377static 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
 387static 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
 394static 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
 422static 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
 458static 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
 481static 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
 507static 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
 585static 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
 621static 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;
 669next_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
 683static 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
 697static 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                        err = -ENODEV;
 724                        goto ref_put;
 725                }
 726        }
 727
 728        if (!dev->board.ir_codes && !dev->board.has_ir_i2c) {
 729                /* No remote control support */
 730                dev_warn(&dev->intf->dev,
 731                         "Remote control support is not available for this card.\n");
 732                return 0;
 733        }
 734
 735        dev_info(&dev->intf->dev, "Registering input extension\n");
 736
 737        ir = kzalloc(sizeof(*ir), GFP_KERNEL);
 738        if (!ir)
 739                goto ref_put;
 740        rc = rc_allocate_device(RC_DRIVER_SCANCODE);
 741        if (!rc)
 742                goto error;
 743
 744        /* record handles to ourself */
 745        ir->dev = dev;
 746        dev->ir = ir;
 747        ir->rc = rc;
 748
 749        rc->priv = ir;
 750        rc->open = em28xx_ir_start;
 751        rc->close = em28xx_ir_stop;
 752
 753        if (dev->board.has_ir_i2c) {    /* external i2c device */
 754                switch (dev->model) {
 755                case EM2800_BOARD_TERRATEC_CINERGY_200:
 756                case EM2820_BOARD_TERRATEC_CINERGY_250:
 757                        rc->map_name = RC_MAP_EM_TERRATEC;
 758                        ir->get_key_i2c = em28xx_get_key_terratec;
 759                        break;
 760                case EM2820_BOARD_PINNACLE_USB_2:
 761                        rc->map_name = RC_MAP_PINNACLE_GREY;
 762                        ir->get_key_i2c = em28xx_get_key_pinnacle_usb_grey;
 763                        break;
 764                case EM2820_BOARD_HAUPPAUGE_WINTV_USB_2:
 765                        rc->map_name = RC_MAP_HAUPPAUGE;
 766                        ir->get_key_i2c = em28xx_get_key_em_haup;
 767                        rc->allowed_protocols = RC_PROTO_BIT_RC5;
 768                        break;
 769                case EM2820_BOARD_LEADTEK_WINFAST_USBII_DELUXE:
 770                        rc->map_name = RC_MAP_WINFAST_USBII_DELUXE;
 771                        ir->get_key_i2c = em28xx_get_key_winfast_usbii_deluxe;
 772                        break;
 773                default:
 774                        err = -ENODEV;
 775                        goto error;
 776                }
 777
 778                ir->i2c_client = kzalloc(sizeof(*ir->i2c_client), GFP_KERNEL);
 779                if (!ir->i2c_client)
 780                        goto error;
 781                ir->i2c_client->adapter = &ir->dev->i2c_adap[dev->def_i2c_bus];
 782                ir->i2c_client->addr = i2c_rc_dev_addr;
 783                ir->i2c_client->flags = 0;
 784                /* NOTE: all other fields of i2c_client are unused */
 785        } else {        /* internal device */
 786                switch (dev->chip_id) {
 787                case CHIP_ID_EM2860:
 788                case CHIP_ID_EM2883:
 789                        rc->allowed_protocols = RC_PROTO_BIT_RC5 |
 790                                                RC_PROTO_BIT_NEC;
 791                        ir->get_key = default_polling_getkey;
 792                        break;
 793                case CHIP_ID_EM2884:
 794                case CHIP_ID_EM2874:
 795                case CHIP_ID_EM28174:
 796                case CHIP_ID_EM28178:
 797                        ir->get_key = em2874_polling_getkey;
 798                        rc->allowed_protocols = RC_PROTO_BIT_RC5 |
 799                                RC_PROTO_BIT_NEC | RC_PROTO_BIT_NECX |
 800                                RC_PROTO_BIT_NEC32 | RC_PROTO_BIT_RC6_0;
 801                        break;
 802                default:
 803                        err = -ENODEV;
 804                        goto error;
 805                }
 806
 807                rc->change_protocol = em28xx_ir_change_protocol;
 808                rc->map_name = dev->board.ir_codes;
 809
 810                /* By default, keep protocol field untouched */
 811                rc_proto = RC_PROTO_BIT_UNKNOWN;
 812                err = em28xx_ir_change_protocol(rc, &rc_proto);
 813                if (err)
 814                        goto error;
 815        }
 816
 817        /* This is how often we ask the chip for IR information */
 818        ir->polling = 100; /* ms */
 819
 820        usb_make_path(udev, ir->phys, sizeof(ir->phys));
 821        strlcat(ir->phys, "/input0", sizeof(ir->phys));
 822
 823        rc->device_name = em28xx_boards[dev->model].name;
 824        rc->input_phys = ir->phys;
 825        usb_to_input_id(udev, &rc->input_id);
 826        rc->dev.parent = &dev->intf->dev;
 827        rc->driver_name = MODULE_NAME;
 828
 829        /* all done */
 830        err = rc_register_device(rc);
 831        if (err)
 832                goto error;
 833
 834        dev_info(&dev->intf->dev, "Input extension successfully initialized\n");
 835
 836        return 0;
 837
 838error:
 839        kfree(ir->i2c_client);
 840        dev->ir = NULL;
 841        rc_free_device(rc);
 842        kfree(ir);
 843ref_put:
 844        em28xx_shutdown_buttons(dev);
 845        kref_put(&dev->ref, em28xx_free_device);
 846        return err;
 847}
 848
 849static int em28xx_ir_fini(struct em28xx *dev)
 850{
 851        struct em28xx_IR *ir = dev->ir;
 852
 853        if (dev->is_audio_only) {
 854                /* Shouldn't initialize IR for this interface */
 855                return 0;
 856        }
 857
 858        dev_info(&dev->intf->dev, "Closing input extension\n");
 859
 860        em28xx_shutdown_buttons(dev);
 861
 862        /* skip detach on non attached boards */
 863        if (!ir)
 864                goto ref_put;
 865
 866        rc_unregister_device(ir->rc);
 867
 868        kfree(ir->i2c_client);
 869
 870        /* done */
 871        kfree(ir);
 872        dev->ir = NULL;
 873
 874ref_put:
 875        kref_put(&dev->ref, em28xx_free_device);
 876
 877        return 0;
 878}
 879
 880static int em28xx_ir_suspend(struct em28xx *dev)
 881{
 882        struct em28xx_IR *ir = dev->ir;
 883
 884        if (dev->is_audio_only)
 885                return 0;
 886
 887        dev_info(&dev->intf->dev, "Suspending input extension\n");
 888        if (ir)
 889                cancel_delayed_work_sync(&ir->work);
 890        cancel_delayed_work_sync(&dev->buttons_query_work);
 891        /*
 892         * is canceling delayed work sufficient or does the rc event
 893         * kthread needs stopping? kthread is stopped in
 894         * ir_raw_event_unregister()
 895         */
 896        return 0;
 897}
 898
 899static int em28xx_ir_resume(struct em28xx *dev)
 900{
 901        struct em28xx_IR *ir = dev->ir;
 902
 903        if (dev->is_audio_only)
 904                return 0;
 905
 906        dev_info(&dev->intf->dev, "Resuming input extension\n");
 907        /*
 908         * if suspend calls ir_raw_event_unregister(), the should call
 909         * ir_raw_event_register()
 910         */
 911        if (ir)
 912                schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling));
 913        if (dev->num_button_polling_addresses)
 914                schedule_delayed_work(&dev->buttons_query_work,
 915                                      msecs_to_jiffies(dev->button_polling_interval));
 916        return 0;
 917}
 918
 919static struct em28xx_ops rc_ops = {
 920        .id   = EM28XX_RC,
 921        .name = "Em28xx Input Extension",
 922        .init = em28xx_ir_init,
 923        .fini = em28xx_ir_fini,
 924        .suspend = em28xx_ir_suspend,
 925        .resume = em28xx_ir_resume,
 926};
 927
 928static int __init em28xx_rc_register(void)
 929{
 930        return em28xx_register_extension(&rc_ops);
 931}
 932
 933static void __exit em28xx_rc_unregister(void)
 934{
 935        em28xx_unregister_extension(&rc_ops);
 936}
 937
 938MODULE_LICENSE("GPL v2");
 939MODULE_AUTHOR("Mauro Carvalho Chehab");
 940MODULE_DESCRIPTION(DRIVER_DESC " - input interface");
 941MODULE_VERSION(EM28XX_VERSION);
 942
 943module_init(em28xx_rc_register);
 944module_exit(em28xx_rc_unregister);
 945