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

   1 /*
   2   handle em28xx IR remotes via linux kernel input layer.
   3
   4    Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
   5                       Markus Rechberger <mrechberger@gmail.com>
   6                       Mauro Carvalho Chehab <mchehab@infradead.org>
   7                       Sascha Sommer <saschasommer@freenet.de>
   8
   9   This program is free software; you can redistribute it and/or modify
  10   it under the terms of the GNU General Public License as published by
  11   the Free Software Foundation; either version 2 of the License, or
  12   (at your option) any later version.
  13
  14   This program is distributed in the hope that it will be useful,
  15   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17   GNU General Public License for more details.
  18
  19   You should have received a copy of the GNU General Public License
  20   along with this program; if not, write to the Free Software
  21   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22  */
  23
  24 #include <linux/module.h>
  25 #include <linux/init.h>
  26 #include <linux/delay.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/usb.h>
  29 #include <linux/slab.h>
  30
  31 #include "em28xx.h"
  32
  33 #define EM28XX_SNAPSHOT_KEY KEY_CAMERA
  34 #define EM28XX_SBUTTON_QUERY_INTERVAL 500
  35 #define EM28XX_R0C_USBSUSP_SNAPSHOT 0x20
  36
  37 static unsigned int ir_debug;
  38 module_param(ir_debug, int, 0644);
  39 MODULE_PARM_DESC(ir_debug, "enable debug messages [IR]");
  40
  41 #define MODULE_NAME "em28xx"
  42
  43 #define i2cdprintk(fmt, arg...) \
  44         if (ir_debug) { \
  45                 printk(KERN_DEBUG "%s/ir: " fmt, ir->name , ## arg); \
  46         }
  47
  48 #define dprintk(fmt, arg...) \
  49         if (ir_debug) { \
  50                 printk(KERN_DEBUG "%s/ir: " fmt, ir->name , ## arg); \
  51         }
  52
  53 /**********************************************************
  54  Polling structure used by em28xx IR's
  55  **********************************************************/
  56
  57 struct em28xx_ir_poll_result {
  58         unsigned int toggle_bit:1;
  59         unsigned int read_count:7;
  60         u8 rc_address;
  61         u8 rc_data[4]; /* 1 byte on em2860/2880, 4 on em2874 */
  62 };
  63
  64 struct em28xx_IR {
  65         struct em28xx *dev;
  66         struct rc_dev *rc;
  67         char name[32];
  68         char phys[32];
  69
  70         /* poll external decoder */
  71         int polling;
  72         struct delayed_work work;
  73         unsigned int full_code:1;
  74         unsigned int last_readcount;
  75
  76         int  (*get_key)(struct em28xx_IR *, struct em28xx_ir_poll_result *);
  77 };
  78
  79 /**********************************************************
  80  I2C IR based get keycodes - should be used with ir-kbd-i2c
  81  **********************************************************/
  82
  83 int em28xx_get_key_terratec(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
  84 {
  85         unsigned char b;
  86
  87         /* poll IR chip */
  88         if (1 != i2c_master_recv(ir->c, &b, 1)) {
  89                 i2cdprintk("read error\n");
  90                 return -EIO;
  91         }
  92
  93         /* it seems that 0xFE indicates that a button is still hold
  94            down, while 0xff indicates that no button is hold
  95            down. 0xfe sequences are sometimes interrupted by 0xFF */
  96
  97         i2cdprintk("key %02x\n", b);
  98
  99         if (b == 0xff)
 100                 return 0;
 101
 102         if (b == 0xfe)
 103                 /* keep old data */
 104                 return 1;
 105
 106         *ir_key = b;
 107         *ir_raw = b;
 108         return 1;
 109 }
 110
 111 int em28xx_get_key_em_haup(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
 112 {
 113         unsigned char buf[2];
 114         u16 code;
 115         int size;
 116
 117         /* poll IR chip */
 118         size = i2c_master_recv(ir->c, buf, sizeof(buf));
 119
 120         if (size != 2)
 121                 return -EIO;
 122
 123         /* Does eliminate repeated parity code */
 124         if (buf[1] == 0xff)
 125                 return 0;
 126
 127         ir->old = buf[1];
 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         code =
 139                  ((buf[0] & 0x01) ? 0x0020 : 0) | /*            0010 0000 */
 140                  ((buf[0] & 0x02) ? 0x0010 : 0) | /*            0001 0000 */
 141                  ((buf[0] & 0x04) ? 0x0008 : 0) | /*            0000 1000 */
 142                  ((buf[0] & 0x08) ? 0x0004 : 0) | /*            0000 0100 */
 143                  ((buf[0] & 0x10) ? 0x0002 : 0) | /*            0000 0010 */
 144                  ((buf[0] & 0x20) ? 0x0001 : 0) | /*            0000 0001 */
 145                  ((buf[1] & 0x08) ? 0x1000 : 0) | /* 0001 0000            */
 146                  ((buf[1] & 0x10) ? 0x0800 : 0) | /* 0000 1000            */
 147                  ((buf[1] & 0x20) ? 0x0400 : 0) | /* 0000 0100            */
 148                  ((buf[1] & 0x40) ? 0x0200 : 0) | /* 0000 0010            */
 149                  ((buf[1] & 0x80) ? 0x0100 : 0);  /* 0000 0001            */
 150
 151         i2cdprintk("ir hauppauge (em2840): code=0x%02x (rcv=0x%02x%02x)\n",
 152                         code, buf[1], buf[0]);
 153
 154         /* return key */
 155         *ir_key = code;
 156         *ir_raw = code;
 157         return 1;
 158 }
 159
 160 int em28xx_get_key_pinnacle_usb_grey(struct IR_i2c *ir, u32 *ir_key,
 161                                      u32 *ir_raw)
 162 {
 163         unsigned char buf[3];
 164
 165         /* poll IR chip */
 166
 167         if (3 != i2c_master_recv(ir->c, buf, 3)) {
 168                 i2cdprintk("read error\n");
 169                 return -EIO;
 170         }
 171
 172         i2cdprintk("key %02x\n", buf[2]&0x3f);
 173         if (buf[0] != 0x00)
 174                 return 0;
 175
 176         *ir_key = buf[2]&0x3f;
 177         *ir_raw = buf[2]&0x3f;
 178
 179         return 1;
 180 }
 181
 182 int em28xx_get_key_winfast_usbii_deluxe(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
 183 {
 184         unsigned char subaddr, keydetect, key;
 185
 186         struct i2c_msg msg[] = { { .addr = ir->c->addr, .flags = 0, .buf = &subaddr, .len = 1},
 187
 188                                 { .addr = ir->c->addr, .flags = I2C_M_RD, .buf = &keydetect, .len = 1} };
 189
 190         subaddr = 0x10;
 191         if (2 != i2c_transfer(ir->c->adapter, msg, 2)) {
 192                 i2cdprintk("read error\n");
 193                 return -EIO;
 194         }
 195         if (keydetect == 0x00)
 196                 return 0;
 197
 198         subaddr = 0x00;
 199         msg[1].buf = &key;
 200         if (2 != i2c_transfer(ir->c->adapter, msg, 2)) {
 201                 i2cdprintk("read error\n");
 202         return -EIO;
 203         }
 204         if (key == 0x00)
 205                 return 0;
 206
 207         *ir_key = key;
 208         *ir_raw = key;
 209         return 1;
 210 }
 211
 212 /**********************************************************
 213  Poll based get keycode functions
 214  **********************************************************/
 215
 216 /* This is for the em2860/em2880 */
 217 static int default_polling_getkey(struct em28xx_IR *ir,
 218                                   struct em28xx_ir_poll_result *poll_result)
 219 {
 220         struct em28xx *dev = ir->dev;
 221         int rc;
 222         u8 msg[3] = { 0, 0, 0 };
 223
 224         /* Read key toggle, brand, and key code
 225            on registers 0x45, 0x46 and 0x47
 226          */
 227         rc = dev->em28xx_read_reg_req_len(dev, 0, EM28XX_R45_IR,
 228                                           msg, sizeof(msg));
 229         if (rc < 0)
 230                 return rc;
 231
 232         /* Infrared toggle (Reg 0x45[7]) */
 233         poll_result->toggle_bit = (msg[0] >> 7);
 234
 235         /* Infrared read count (Reg 0x45[6:0] */
 236         poll_result->read_count = (msg[0] & 0x7f);
 237
 238         /* Remote Control Address (Reg 0x46) */
 239         poll_result->rc_address = msg[1];
 240
 241         /* Remote Control Data (Reg 0x47) */
 242         poll_result->rc_data[0] = msg[2];
 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         /* Read key toggle, brand, and key code
 255            on registers 0x51-55
 256          */
 257         rc = dev->em28xx_read_reg_req_len(dev, 0, EM2874_R51_IR,
 258                                           msg, sizeof(msg));
 259         if (rc < 0)
 260                 return rc;
 261
 262         /* Infrared toggle (Reg 0x51[7]) */
 263         poll_result->toggle_bit = (msg[0] >> 7);
 264
 265         /* Infrared read count (Reg 0x51[6:0] */
 266         poll_result->read_count = (msg[0] & 0x7f);
 267
 268         /* Remote Control Address (Reg 0x52) */
 269         poll_result->rc_address = msg[1];
 270
 271         /* Remote Control Data (Reg 0x53-55) */
 272         poll_result->rc_data[0] = msg[2];
 273         poll_result->rc_data[1] = msg[3];
 274         poll_result->rc_data[2] = msg[4];
 275
 276         return 0;
 277 }
 278
 279 /**********************************************************
 280  Polling code for em28xx
 281  **********************************************************/
 282
 283 static void em28xx_ir_handle_key(struct em28xx_IR *ir)
 284 {
 285         int result;
 286         struct em28xx_ir_poll_result poll_result;
 287
 288         /* read the registers containing the IR status */
 289         result = ir->get_key(ir, &poll_result);
 290         if (unlikely(result < 0)) {
 291                 dprintk("ir->get_key() failed %d\n", result);
 292                 return;
 293         }
 294
 295         if (unlikely(poll_result.read_count != ir->last_readcount)) {
 296                 dprintk("%s: toggle: %d, count: %d, key 0x%02x%02x\n", __func__,
 297                         poll_result.toggle_bit, poll_result.read_count,
 298                         poll_result.rc_address, poll_result.rc_data[0]);
 299                 if (ir->full_code)
 300                         rc_keydown(ir->rc,
 301                                    poll_result.rc_address << 8 |
 302                                    poll_result.rc_data[0],
 303                                    poll_result.toggle_bit);
 304                 else
 305                         rc_keydown(ir->rc,
 306                                    poll_result.rc_data[0],
 307                                    poll_result.toggle_bit);
 308
 309                 if (ir->dev->chip_id == CHIP_ID_EM2874)
 310                         /* The em2874 clears the readcount field every time the
 311                            register is read.  The em2860/2880 datasheet says that it
 312                            is supposed to clear the readcount, but it doesn't.  So with
 313                            the em2874, we are looking for a non-zero read count as
 314                            opposed to a readcount that is incrementing */
 315                         ir->last_readcount = 0;
 316                 else
 317                         ir->last_readcount = poll_result.read_count;
 318         }
 319 }
 320
 321 static void em28xx_ir_work(struct work_struct *work)
 322 {
 323         struct em28xx_IR *ir = container_of(work, struct em28xx_IR, work.work);
 324
 325         em28xx_ir_handle_key(ir);
 326         schedule_delayed_work(&ir->work, msecs_to_jiffies(ir->polling));
 327 }
 328
 329 static int em28xx_ir_start(struct rc_dev *rc)
 330 {
 331         struct em28xx_IR *ir = rc->priv;
 332
 333         INIT_DELAYED_WORK(&ir->work, em28xx_ir_work);
 334         schedule_delayed_work(&ir->work, 0);
 335
 336         return 0;
 337 }
 338
 339 static void em28xx_ir_stop(struct rc_dev *rc)
 340 {
 341         struct em28xx_IR *ir = rc->priv;
 342
 343         cancel_delayed_work_sync(&ir->work);
 344 }
 345
 346 int em28xx_ir_change_protocol(struct rc_dev *rc_dev, u64 rc_type)
 347 {
 348         int rc = 0;
 349         struct em28xx_IR *ir = rc_dev->priv;
 350         struct em28xx *dev = ir->dev;
 351         u8 ir_config = EM2874_IR_RC5;
 352
 353         /* Adjust xclk based o IR table for RC5/NEC tables */
 354
 355         if (rc_type == RC_TYPE_RC5) {
 356                 dev->board.xclk |= EM28XX_XCLK_IR_RC5_MODE;
 357                 ir->full_code = 1;
 358         } else if (rc_type == RC_TYPE_NEC) {
 359                 dev->board.xclk &= ~EM28XX_XCLK_IR_RC5_MODE;
 360                 ir_config = EM2874_IR_NEC;
 361                 ir->full_code = 1;
 362         } else if (rc_type != RC_TYPE_UNKNOWN)
 363                 rc = -EINVAL;
 364
 365         em28xx_write_reg_bits(dev, EM28XX_R0F_XCLK, dev->board.xclk,
 366                               EM28XX_XCLK_IR_RC5_MODE);
 367
 368         /* Setup the proper handler based on the chip */
 369         switch (dev->chip_id) {
 370         case CHIP_ID_EM2860:
 371         case CHIP_ID_EM2883:
 372                 ir->get_key = default_polling_getkey;
 373                 break;
 374         case CHIP_ID_EM2874:
 375         case CHIP_ID_EM28174:
 376                 ir->get_key = em2874_polling_getkey;
 377                 em28xx_write_regs(dev, EM2874_R50_IR_CONFIG, &ir_config, 1);
 378                 break;
 379         default:
 380                 printk("Unrecognized em28xx chip id: IR not supported\n");
 381                 rc = -EINVAL;
 382         }
 383
 384         return rc;
 385 }
 386
 387 int em28xx_ir_init(struct em28xx *dev)
 388 {
 389         struct em28xx_IR *ir;
 390         struct rc_dev *rc;
 391         int err = -ENOMEM;
 392
 393         if (dev->board.ir_codes == NULL) {
 394                 /* No remote control support */
 395                 return 0;
 396         }
 397
 398         ir = kzalloc(sizeof(*ir), GFP_KERNEL);
 399         rc = rc_allocate_device();
 400         if (!ir || !rc)
 401                 goto err_out_free;
 402
 403         /* record handles to ourself */
 404         ir->dev = dev;
 405         dev->ir = ir;
 406         ir->rc = rc;
 407
 408         /*
 409          * em2874 supports more protocols. For now, let's just announce
 410          * the two protocols that were already tested
 411          */
 412         rc->allowed_protos = RC_TYPE_RC5 | RC_TYPE_NEC;
 413         rc->priv = ir;
 414         rc->change_protocol = em28xx_ir_change_protocol;
 415         rc->open = em28xx_ir_start;
 416         rc->close = em28xx_ir_stop;
 417
 418         /* By default, keep protocol field untouched */
 419         err = em28xx_ir_change_protocol(rc, RC_TYPE_UNKNOWN);
 420         if (err)
 421                 goto err_out_free;
 422
 423         /* This is how often we ask the chip for IR information */
 424         ir->polling = 100; /* ms */
 425
 426         /* init input device */
 427         snprintf(ir->name, sizeof(ir->name), "em28xx IR (%s)",
 428                                                 dev->name);
 429
 430         usb_make_path(dev->udev, ir->phys, sizeof(ir->phys));
 431         strlcat(ir->phys, "/input0", sizeof(ir->phys));
 432
 433         rc->input_name = ir->name;
 434         rc->input_phys = ir->phys;
 435         rc->input_id.bustype = BUS_USB;
 436         rc->input_id.version = 1;
 437         rc->input_id.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
 438         rc->input_id.product = le16_to_cpu(dev->udev->descriptor.idProduct);
 439         rc->dev.parent = &dev->udev->dev;
 440         rc->map_name = dev->board.ir_codes;
 441         rc->driver_name = MODULE_NAME;
 442
 443         /* all done */
 444         err = rc_register_device(rc);
 445         if (err)
 446                 goto err_out_stop;
 447
 448         return 0;
 449
 450  err_out_stop:
 451         dev->ir = NULL;
 452  err_out_free:
 453         rc_free_device(rc);
 454         kfree(ir);
 455         return err;
 456 }
 457
 458 int em28xx_ir_fini(struct em28xx *dev)
 459 {
 460         struct em28xx_IR *ir = dev->ir;
 461
 462         /* skip detach on non attached boards */
 463         if (!ir)
 464                 return 0;
 465
 466         em28xx_ir_stop(ir->rc);
 467         rc_unregister_device(ir->rc);
 468         kfree(ir);
 469
 470         /* done */
 471         dev->ir = NULL;
 472         return 0;
 473 }
 474
 475 /**********************************************************
 476  Handle Webcam snapshot button
 477  **********************************************************/
 478
 479 static void em28xx_query_sbutton(struct work_struct *work)
 480 {
 481         /* Poll the register and see if the button is depressed */
 482         struct em28xx *dev =
 483                 container_of(work, struct em28xx, sbutton_query_work.work);
 484         int ret;
 485
 486         ret = em28xx_read_reg(dev, EM28XX_R0C_USBSUSP);
 487
 488         if (ret & EM28XX_R0C_USBSUSP_SNAPSHOT) {
 489                 u8 cleared;
 490                 /* Button is depressed, clear the register */
 491                 cleared = ((u8) ret) & ~EM28XX_R0C_USBSUSP_SNAPSHOT;
 492                 em28xx_write_regs(dev, EM28XX_R0C_USBSUSP, &cleared, 1);
 493
 494                 /* Not emulate the keypress */
 495                 input_report_key(dev->sbutton_input_dev, EM28XX_SNAPSHOT_KEY,
 496                                  1);
 497                 /* Now unpress the key */
 498                 input_report_key(dev->sbutton_input_dev, EM28XX_SNAPSHOT_KEY,
 499                                  0);
 500         }
 501
 502         /* Schedule next poll */
 503         schedule_delayed_work(&dev->sbutton_query_work,
 504                               msecs_to_jiffies(EM28XX_SBUTTON_QUERY_INTERVAL));
 505 }
 506
 507 void em28xx_register_snapshot_button(struct em28xx *dev)
 508 {
 509         struct input_dev *input_dev;
 510         int err;
 511
 512         em28xx_info("Registering snapshot button...\n");
 513         input_dev = input_allocate_device();
 514         if (!input_dev) {
 515                 em28xx_errdev("input_allocate_device failed\n");
 516                 return;
 517         }
 518
 519         usb_make_path(dev->udev, dev->snapshot_button_path,
 520                       sizeof(dev->snapshot_button_path));
 521         strlcat(dev->snapshot_button_path, "/sbutton",
 522                 sizeof(dev->snapshot_button_path));
 523         INIT_DELAYED_WORK(&dev->sbutton_query_work, em28xx_query_sbutton);
 524
 525         input_dev->name = "em28xx snapshot button";
 526         input_dev->phys = dev->snapshot_button_path;
 527         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
 528         set_bit(EM28XX_SNAPSHOT_KEY, input_dev->keybit);
 529         input_dev->keycodesize = 0;
 530         input_dev->keycodemax = 0;
 531         input_dev->id.bustype = BUS_USB;
 532         input_dev->id.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
 533         input_dev->id.product = le16_to_cpu(dev->udev->descriptor.idProduct);
 534         input_dev->id.version = 1;
 535         input_dev->dev.parent = &dev->udev->dev;
 536
 537         err = input_register_device(input_dev);
 538         if (err) {
 539                 em28xx_errdev("input_register_device failed\n");
 540                 input_free_device(input_dev);
 541                 return;
 542         }
 543
 544         dev->sbutton_input_dev = input_dev;
 545         schedule_delayed_work(&dev->sbutton_query_work,
 546                               msecs_to_jiffies(EM28XX_SBUTTON_QUERY_INTERVAL));
 547         return;
 548
 549 }
 550
 551 void em28xx_deregister_snapshot_button(struct em28xx *dev)
 552 {
 553         if (dev->sbutton_input_dev != NULL) {
 554                 em28xx_info("Deregistering snapshot button\n");
 555                 cancel_delayed_work_sync(&dev->sbutton_query_work);
 556                 input_unregister_device(dev->sbutton_input_dev);
 557                 dev->sbutton_input_dev = NULL;
 558         }
 559         return;
 560 }