drivers/media/rc/img-ir/img-ir-hw.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * ImgTec IR Hardware Decoder found in PowerDown Controller.
   4  *
   5  * Copyright 2010-2014 Imagination Technologies Ltd.
   6  *
   7  * This ties into the input subsystem using the RC-core. Protocol support is
   8  * provided in separate modules which provide the parameters and scancode
   9  * translation functions to set up the hardware decoder and interpret the
  10  * resulting input.
  11  */
  12
  13 #include <linux/bitops.h>
  14 #include <linux/clk.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/spinlock.h>
  17 #include <linux/timer.h>
  18 #include <media/rc-core.h>
  19 #include "img-ir.h"
  20
  21 /* Decoders lock (only modified to preprocess them) */
  22 static DEFINE_SPINLOCK(img_ir_decoders_lock);
  23
  24 static bool img_ir_decoders_preprocessed;
  25 static struct img_ir_decoder *img_ir_decoders[] = {
  26 #ifdef CONFIG_IR_IMG_NEC
  27         &img_ir_nec,
  28 #endif
  29 #ifdef CONFIG_IR_IMG_JVC
  30         &img_ir_jvc,
  31 #endif
  32 #ifdef CONFIG_IR_IMG_SONY
  33         &img_ir_sony,
  34 #endif
  35 #ifdef CONFIG_IR_IMG_SHARP
  36         &img_ir_sharp,
  37 #endif
  38 #ifdef CONFIG_IR_IMG_SANYO
  39         &img_ir_sanyo,
  40 #endif
  41 #ifdef CONFIG_IR_IMG_RC5
  42         &img_ir_rc5,
  43 #endif
  44 #ifdef CONFIG_IR_IMG_RC6
  45         &img_ir_rc6,
  46 #endif
  47         NULL
  48 };
  49
  50 #define IMG_IR_F_FILTER         BIT(RC_FILTER_NORMAL)   /* enable filtering */
  51 #define IMG_IR_F_WAKE           BIT(RC_FILTER_WAKEUP)   /* enable waking */
  52
  53 /* code type quirks */
  54
  55 #define IMG_IR_QUIRK_CODE_BROKEN        0x1     /* Decode is broken */
  56 #define IMG_IR_QUIRK_CODE_LEN_INCR      0x2     /* Bit length needs increment */
  57 /*
  58  * The decoder generates rapid interrupts without actually having
  59  * received any new data after an incomplete IR code is decoded.
  60  */
  61 #define IMG_IR_QUIRK_CODE_IRQ           0x4
  62
  63 /* functions for preprocessing timings, ensuring max is set */
  64
  65 static void img_ir_timing_preprocess(struct img_ir_timing_range *range,
  66                                      unsigned int unit)
  67 {
  68         if (range->max < range->min)
  69                 range->max = range->min;
  70         if (unit) {
  71                 /* multiply by unit and convert to microseconds */
  72                 range->min = (range->min*unit)/1000;
  73                 range->max = (range->max*unit + 999)/1000; /* round up */
  74         }
  75 }
  76
  77 static void img_ir_symbol_timing_preprocess(struct img_ir_symbol_timing *timing,
  78                                             unsigned int unit)
  79 {
  80         img_ir_timing_preprocess(&timing->pulse, unit);
  81         img_ir_timing_preprocess(&timing->space, unit);
  82 }
  83
  84 static void img_ir_timings_preprocess(struct img_ir_timings *timings,
  85                                       unsigned int unit)
  86 {
  87         img_ir_symbol_timing_preprocess(&timings->ldr, unit);
  88         img_ir_symbol_timing_preprocess(&timings->s00, unit);
  89         img_ir_symbol_timing_preprocess(&timings->s01, unit);
  90         img_ir_symbol_timing_preprocess(&timings->s10, unit);
  91         img_ir_symbol_timing_preprocess(&timings->s11, unit);
  92         /* default s10 and s11 to s00 and s01 if no leader */
  93         if (unit)
  94                 /* multiply by unit and convert to microseconds (round up) */
  95                 timings->ft.ft_min = (timings->ft.ft_min*unit + 999)/1000;
  96 }
  97
  98 /* functions for filling empty fields with defaults */
  99
 100 static void img_ir_timing_defaults(struct img_ir_timing_range *range,
 101                                    struct img_ir_timing_range *defaults)
 102 {
 103         if (!range->min)
 104                 range->min = defaults->min;
 105         if (!range->max)
 106                 range->max = defaults->max;
 107 }
 108
 109 static void img_ir_symbol_timing_defaults(struct img_ir_symbol_timing *timing,
 110                                           struct img_ir_symbol_timing *defaults)
 111 {
 112         img_ir_timing_defaults(&timing->pulse, &defaults->pulse);
 113         img_ir_timing_defaults(&timing->space, &defaults->space);
 114 }
 115
 116 static void img_ir_timings_defaults(struct img_ir_timings *timings,
 117                                     struct img_ir_timings *defaults)
 118 {
 119         img_ir_symbol_timing_defaults(&timings->ldr, &defaults->ldr);
 120         img_ir_symbol_timing_defaults(&timings->s00, &defaults->s00);
 121         img_ir_symbol_timing_defaults(&timings->s01, &defaults->s01);
 122         img_ir_symbol_timing_defaults(&timings->s10, &defaults->s10);
 123         img_ir_symbol_timing_defaults(&timings->s11, &defaults->s11);
 124         if (!timings->ft.ft_min)
 125                 timings->ft.ft_min = defaults->ft.ft_min;
 126 }
 127
 128 /* functions for converting timings to register values */
 129
 130 /**
 131  * img_ir_control() - Convert control struct to control register value.
 132  * @control:    Control data
 133  *
 134  * Returns:     The control register value equivalent of @control.
 135  */
 136 static u32 img_ir_control(const struct img_ir_control *control)
 137 {
 138         u32 ctrl = control->code_type << IMG_IR_CODETYPE_SHIFT;
 139         if (control->decoden)
 140                 ctrl |= IMG_IR_DECODEN;
 141         if (control->hdrtog)
 142                 ctrl |= IMG_IR_HDRTOG;
 143         if (control->ldrdec)
 144                 ctrl |= IMG_IR_LDRDEC;
 145         if (control->decodinpol)
 146                 ctrl |= IMG_IR_DECODINPOL;
 147         if (control->bitorien)
 148                 ctrl |= IMG_IR_BITORIEN;
 149         if (control->d1validsel)
 150                 ctrl |= IMG_IR_D1VALIDSEL;
 151         if (control->bitinv)
 152                 ctrl |= IMG_IR_BITINV;
 153         if (control->decodend2)
 154                 ctrl |= IMG_IR_DECODEND2;
 155         if (control->bitoriend2)
 156                 ctrl |= IMG_IR_BITORIEND2;
 157         if (control->bitinvd2)
 158                 ctrl |= IMG_IR_BITINVD2;
 159         return ctrl;
 160 }
 161
 162 /**
 163  * img_ir_timing_range_convert() - Convert microsecond range.
 164  * @out:        Output timing range in clock cycles with a shift.
 165  * @in:         Input timing range in microseconds.
 166  * @tolerance:  Tolerance as a fraction of 128 (roughly percent).
 167  * @clock_hz:   IR clock rate in Hz.
 168  * @shift:      Shift of output units.
 169  *
 170  * Converts min and max from microseconds to IR clock cycles, applies a
 171  * tolerance, and shifts for the register, rounding in the right direction.
 172  * Note that in and out can safely be the same object.
 173  */
 174 static void img_ir_timing_range_convert(struct img_ir_timing_range *out,
 175                                         const struct img_ir_timing_range *in,
 176                                         unsigned int tolerance,
 177                                         unsigned long clock_hz,
 178                                         unsigned int shift)
 179 {
 180         unsigned int min = in->min;
 181         unsigned int max = in->max;
 182         /* add a tolerance */
 183         min = min - (min*tolerance >> 7);
 184         max = max + (max*tolerance >> 7);
 185         /* convert from microseconds into clock cycles */
 186         min = min*clock_hz / 1000000;
 187         max = (max*clock_hz + 999999) / 1000000; /* round up */
 188         /* apply shift and copy to output */
 189         out->min = min >> shift;
 190         out->max = (max + ((1 << shift) - 1)) >> shift; /* round up */
 191 }
 192
 193 /**
 194  * img_ir_symbol_timing() - Convert symbol timing struct to register value.
 195  * @timing:     Symbol timing data
 196  * @tolerance:  Timing tolerance where 0-128 represents 0-100%
 197  * @clock_hz:   Frequency of source clock in Hz
 198  * @pd_shift:   Shift to apply to symbol period
 199  * @w_shift:    Shift to apply to symbol width
 200  *
 201  * Returns:     Symbol timing register value based on arguments.
 202  */
 203 static u32 img_ir_symbol_timing(const struct img_ir_symbol_timing *timing,
 204                                 unsigned int tolerance,
 205                                 unsigned long clock_hz,
 206                                 unsigned int pd_shift,
 207                                 unsigned int w_shift)
 208 {
 209         struct img_ir_timing_range hw_pulse, hw_period;
 210         /* we calculate period in hw_period, then convert in place */
 211         hw_period.min = timing->pulse.min + timing->space.min;
 212         hw_period.max = timing->pulse.max + timing->space.max;
 213         img_ir_timing_range_convert(&hw_period, &hw_period,
 214                         tolerance, clock_hz, pd_shift);
 215         img_ir_timing_range_convert(&hw_pulse, &timing->pulse,
 216                         tolerance, clock_hz, w_shift);
 217         /* construct register value */
 218         return  (hw_period.max  << IMG_IR_PD_MAX_SHIFT) |
 219                 (hw_period.min  << IMG_IR_PD_MIN_SHIFT) |
 220                 (hw_pulse.max   << IMG_IR_W_MAX_SHIFT)  |
 221                 (hw_pulse.min   << IMG_IR_W_MIN_SHIFT);
 222 }
 223
 224 /**
 225  * img_ir_free_timing() - Convert free time timing struct to register value.
 226  * @timing:     Free symbol timing data
 227  * @clock_hz:   Source clock frequency in Hz
 228  *
 229  * Returns:     Free symbol timing register value.
 230  */
 231 static u32 img_ir_free_timing(const struct img_ir_free_timing *timing,
 232                               unsigned long clock_hz)
 233 {
 234         unsigned int minlen, maxlen, ft_min;
 235         /* minlen is only 5 bits, and round minlen to multiple of 2 */
 236         if (timing->minlen < 30)
 237                 minlen = timing->minlen & -2;
 238         else
 239                 minlen = 30;
 240         /* maxlen has maximum value of 48, and round maxlen to multiple of 2 */
 241         if (timing->maxlen < 48)
 242                 maxlen = (timing->maxlen + 1) & -2;
 243         else
 244                 maxlen = 48;
 245         /* convert and shift ft_min, rounding upwards */
 246         ft_min = (timing->ft_min*clock_hz + 999999) / 1000000;
 247         ft_min = (ft_min + 7) >> 3;
 248         /* construct register value */
 249         return  (maxlen << IMG_IR_MAXLEN_SHIFT) |
 250                 (minlen << IMG_IR_MINLEN_SHIFT) |
 251                 (ft_min << IMG_IR_FT_MIN_SHIFT);
 252 }
 253
 254 /**
 255  * img_ir_free_timing_dynamic() - Update free time register value.
 256  * @st_ft:      Static free time register value from img_ir_free_timing.
 257  * @filter:     Current filter which may additionally restrict min/max len.
 258  *
 259  * Returns:     Updated free time register value based on the current filter.
 260  */
 261 static u32 img_ir_free_timing_dynamic(u32 st_ft, struct img_ir_filter *filter)
 262 {
 263         unsigned int minlen, maxlen, newminlen, newmaxlen;
 264
 265         /* round minlen, maxlen to multiple of 2 */
 266         newminlen = filter->minlen & -2;
 267         newmaxlen = (filter->maxlen + 1) & -2;
 268         /* extract min/max len from register */
 269         minlen = (st_ft & IMG_IR_MINLEN) >> IMG_IR_MINLEN_SHIFT;
 270         maxlen = (st_ft & IMG_IR_MAXLEN) >> IMG_IR_MAXLEN_SHIFT;
 271         /* if the new values are more restrictive, update the register value */
 272         if (newminlen > minlen) {
 273                 st_ft &= ~IMG_IR_MINLEN;
 274                 st_ft |= newminlen << IMG_IR_MINLEN_SHIFT;
 275         }
 276         if (newmaxlen < maxlen) {
 277                 st_ft &= ~IMG_IR_MAXLEN;
 278                 st_ft |= newmaxlen << IMG_IR_MAXLEN_SHIFT;
 279         }
 280         return st_ft;
 281 }
 282
 283 /**
 284  * img_ir_timings_convert() - Convert timings to register values
 285  * @regs:       Output timing register values
 286  * @timings:    Input timing data
 287  * @tolerance:  Timing tolerance where 0-128 represents 0-100%
 288  * @clock_hz:   Source clock frequency in Hz
 289  */
 290 static void img_ir_timings_convert(struct img_ir_timing_regvals *regs,
 291                                    const struct img_ir_timings *timings,
 292                                    unsigned int tolerance,
 293                                    unsigned int clock_hz)
 294 {
 295         /* leader symbol timings are divided by 16 */
 296         regs->ldr = img_ir_symbol_timing(&timings->ldr, tolerance, clock_hz,
 297                         4, 4);
 298         /* other symbol timings, pd fields only are divided by 2 */
 299         regs->s00 = img_ir_symbol_timing(&timings->s00, tolerance, clock_hz,
 300                         1, 0);
 301         regs->s01 = img_ir_symbol_timing(&timings->s01, tolerance, clock_hz,
 302                         1, 0);
 303         regs->s10 = img_ir_symbol_timing(&timings->s10, tolerance, clock_hz,
 304                         1, 0);
 305         regs->s11 = img_ir_symbol_timing(&timings->s11, tolerance, clock_hz,
 306                         1, 0);
 307         regs->ft = img_ir_free_timing(&timings->ft, clock_hz);
 308 }
 309
 310 /**
 311  * img_ir_decoder_preprocess() - Preprocess timings in decoder.
 312  * @decoder:    Decoder to be preprocessed.
 313  *
 314  * Ensures that the symbol timing ranges are valid with respect to ordering, and
 315  * does some fixed conversion on them.
 316  */
 317 static void img_ir_decoder_preprocess(struct img_ir_decoder *decoder)
 318 {
 319         /* default tolerance */
 320         if (!decoder->tolerance)
 321                 decoder->tolerance = 10; /* percent */
 322         /* and convert tolerance to fraction out of 128 */
 323         decoder->tolerance = decoder->tolerance * 128 / 100;
 324
 325         /* fill in implicit fields */
 326         img_ir_timings_preprocess(&decoder->timings, decoder->unit);
 327
 328         /* do the same for repeat timings if applicable */
 329         if (decoder->repeat) {
 330                 img_ir_timings_preprocess(&decoder->rtimings, decoder->unit);
 331                 img_ir_timings_defaults(&decoder->rtimings, &decoder->timings);
 332         }
 333 }
 334
 335 /**
 336  * img_ir_decoder_convert() - Generate internal timings in decoder.
 337  * @decoder:    Decoder to be converted to internal timings.
 338  * @reg_timings: Timing register values.
 339  * @clock_hz:   IR clock rate in Hz.
 340  *
 341  * Fills out the repeat timings and timing register values for a specific clock
 342  * rate.
 343  */
 344 static void img_ir_decoder_convert(const struct img_ir_decoder *decoder,
 345                                    struct img_ir_reg_timings *reg_timings,
 346                                    unsigned int clock_hz)
 347 {
 348         /* calculate control value */
 349         reg_timings->ctrl = img_ir_control(&decoder->control);
 350
 351         /* fill in implicit fields and calculate register values */
 352         img_ir_timings_convert(&reg_timings->timings, &decoder->timings,
 353                                decoder->tolerance, clock_hz);
 354
 355         /* do the same for repeat timings if applicable */
 356         if (decoder->repeat)
 357                 img_ir_timings_convert(&reg_timings->rtimings,
 358                                        &decoder->rtimings, decoder->tolerance,
 359                                        clock_hz);
 360 }
 361
 362 /**
 363  * img_ir_write_timings() - Write timings to the hardware now
 364  * @priv:       IR private data
 365  * @regs:       Timing register values to write
 366  * @type:       RC filter type (RC_FILTER_*)
 367  *
 368  * Write timing register values @regs to the hardware, taking into account the
 369  * current filter which may impose restrictions on the length of the expected
 370  * data.
 371  */
 372 static void img_ir_write_timings(struct img_ir_priv *priv,
 373                                  struct img_ir_timing_regvals *regs,
 374                                  enum rc_filter_type type)
 375 {
 376         struct img_ir_priv_hw *hw = &priv->hw;
 377
 378         /* filter may be more restrictive to minlen, maxlen */
 379         u32 ft = regs->ft;
 380         if (hw->flags & BIT(type))
 381                 ft = img_ir_free_timing_dynamic(regs->ft, &hw->filters[type]);
 382         /* write to registers */
 383         img_ir_write(priv, IMG_IR_LEAD_SYMB_TIMING, regs->ldr);
 384         img_ir_write(priv, IMG_IR_S00_SYMB_TIMING, regs->s00);
 385         img_ir_write(priv, IMG_IR_S01_SYMB_TIMING, regs->s01);
 386         img_ir_write(priv, IMG_IR_S10_SYMB_TIMING, regs->s10);
 387         img_ir_write(priv, IMG_IR_S11_SYMB_TIMING, regs->s11);
 388         img_ir_write(priv, IMG_IR_FREE_SYMB_TIMING, ft);
 389         dev_dbg(priv->dev, "timings: ldr=%#x, s=[%#x, %#x, %#x, %#x], ft=%#x\n",
 390                 regs->ldr, regs->s00, regs->s01, regs->s10, regs->s11, ft);
 391 }
 392
 393 static void img_ir_write_filter(struct img_ir_priv *priv,
 394                                 struct img_ir_filter *filter)
 395 {
 396         if (filter) {
 397                 dev_dbg(priv->dev, "IR filter=%016llx & %016llx\n",
 398                         (unsigned long long)filter->data,
 399                         (unsigned long long)filter->mask);
 400                 img_ir_write(priv, IMG_IR_IRQ_MSG_DATA_LW, (u32)filter->data);
 401                 img_ir_write(priv, IMG_IR_IRQ_MSG_DATA_UP, (u32)(filter->data
 402                                                                         >> 32));
 403                 img_ir_write(priv, IMG_IR_IRQ_MSG_MASK_LW, (u32)filter->mask);
 404                 img_ir_write(priv, IMG_IR_IRQ_MSG_MASK_UP, (u32)(filter->mask
 405                                                                         >> 32));
 406         } else {
 407                 dev_dbg(priv->dev, "IR clearing filter\n");
 408                 img_ir_write(priv, IMG_IR_IRQ_MSG_MASK_LW, 0);
 409                 img_ir_write(priv, IMG_IR_IRQ_MSG_MASK_UP, 0);
 410         }
 411 }
 412
 413 /* caller must have lock */
 414 static void _img_ir_set_filter(struct img_ir_priv *priv,
 415                                struct img_ir_filter *filter)
 416 {
 417         struct img_ir_priv_hw *hw = &priv->hw;
 418         u32 irq_en, irq_on;
 419
 420         irq_en = img_ir_read(priv, IMG_IR_IRQ_ENABLE);
 421         if (filter) {
 422                 /* Only use the match interrupt */
 423                 hw->filters[RC_FILTER_NORMAL] = *filter;
 424                 hw->flags |= IMG_IR_F_FILTER;
 425                 irq_on = IMG_IR_IRQ_DATA_MATCH;
 426                 irq_en &= ~(IMG_IR_IRQ_DATA_VALID | IMG_IR_IRQ_DATA2_VALID);
 427         } else {
 428                 /* Only use the valid interrupt */
 429                 hw->flags &= ~IMG_IR_F_FILTER;
 430                 irq_en &= ~IMG_IR_IRQ_DATA_MATCH;
 431                 irq_on = IMG_IR_IRQ_DATA_VALID | IMG_IR_IRQ_DATA2_VALID;
 432         }
 433         irq_en |= irq_on;
 434
 435         img_ir_write_filter(priv, filter);
 436         /* clear any interrupts we're enabling so we don't handle old ones */
 437         img_ir_write(priv, IMG_IR_IRQ_CLEAR, irq_on);
 438         img_ir_write(priv, IMG_IR_IRQ_ENABLE, irq_en);
 439 }
 440
 441 /* caller must have lock */
 442 static void _img_ir_set_wake_filter(struct img_ir_priv *priv,
 443                                     struct img_ir_filter *filter)
 444 {
 445         struct img_ir_priv_hw *hw = &priv->hw;
 446         if (filter) {
 447                 /* Enable wake, and copy filter for later */
 448                 hw->filters[RC_FILTER_WAKEUP] = *filter;
 449                 hw->flags |= IMG_IR_F_WAKE;
 450         } else {
 451                 /* Disable wake */
 452                 hw->flags &= ~IMG_IR_F_WAKE;
 453         }
 454 }
 455
 456 /* Callback for setting scancode filter */
 457 static int img_ir_set_filter(struct rc_dev *dev, enum rc_filter_type type,
 458                              struct rc_scancode_filter *sc_filter)
 459 {
 460         struct img_ir_priv *priv = dev->priv;
 461         struct img_ir_priv_hw *hw = &priv->hw;
 462         struct img_ir_filter filter, *filter_ptr = &filter;
 463         int ret = 0;
 464
 465         dev_dbg(priv->dev, "IR scancode %sfilter=%08x & %08x\n",
 466                 type == RC_FILTER_WAKEUP ? "wake " : "",
 467                 sc_filter->data,
 468                 sc_filter->mask);
 469
 470         spin_lock_irq(&priv->lock);
 471
 472         /* filtering can always be disabled */
 473         if (!sc_filter->mask) {
 474                 filter_ptr = NULL;
 475                 goto set_unlock;
 476         }
 477
 478         /* current decoder must support scancode filtering */
 479         if (!hw->decoder || !hw->decoder->filter) {
 480                 ret = -EINVAL;
 481                 goto unlock;
 482         }
 483
 484         /* convert scancode filter to raw filter */
 485         filter.minlen = 0;
 486         filter.maxlen = ~0;
 487         if (type == RC_FILTER_NORMAL) {
 488                 /* guess scancode from protocol */
 489                 ret = hw->decoder->filter(sc_filter, &filter,
 490                                           dev->enabled_protocols);
 491         } else {
 492                 /* for wakeup user provided exact protocol variant */
 493                 ret = hw->decoder->filter(sc_filter, &filter,
 494                                           1ULL << dev->wakeup_protocol);
 495         }
 496         if (ret)
 497                 goto unlock;
 498         dev_dbg(priv->dev, "IR raw %sfilter=%016llx & %016llx\n",
 499                 type == RC_FILTER_WAKEUP ? "wake " : "",
 500                 (unsigned long long)filter.data,
 501                 (unsigned long long)filter.mask);
 502
 503 set_unlock:
 504         /* apply raw filters */
 505         switch (type) {
 506         case RC_FILTER_NORMAL:
 507                 _img_ir_set_filter(priv, filter_ptr);
 508                 break;
 509         case RC_FILTER_WAKEUP:
 510                 _img_ir_set_wake_filter(priv, filter_ptr);
 511                 break;
 512         default:
 513                 ret = -EINVAL;
 514         }
 515
 516 unlock:
 517         spin_unlock_irq(&priv->lock);
 518         return ret;
 519 }
 520
 521 static int img_ir_set_normal_filter(struct rc_dev *dev,
 522                                     struct rc_scancode_filter *sc_filter)
 523 {
 524         return img_ir_set_filter(dev, RC_FILTER_NORMAL, sc_filter);
 525 }
 526
 527 static int img_ir_set_wakeup_filter(struct rc_dev *dev,
 528                                     struct rc_scancode_filter *sc_filter)
 529 {
 530         return img_ir_set_filter(dev, RC_FILTER_WAKEUP, sc_filter);
 531 }
 532
 533 /**
 534  * img_ir_set_decoder() - Set the current decoder.
 535  * @priv:       IR private data.
 536  * @decoder:    Decoder to use with immediate effect.
 537  * @proto:      Protocol bitmap (or 0 to use decoder->type).
 538  */
 539 static void img_ir_set_decoder(struct img_ir_priv *priv,
 540                                const struct img_ir_decoder *decoder,
 541                                u64 proto)
 542 {
 543         struct img_ir_priv_hw *hw = &priv->hw;
 544         struct rc_dev *rdev = hw->rdev;
 545         u32 ir_status, irq_en;
 546         spin_lock_irq(&priv->lock);
 547
 548         /*
 549          * First record that the protocol is being stopped so that the end timer
 550          * isn't restarted while we're trying to stop it.
 551          */
 552         hw->stopping = true;
 553
 554         /*
 555          * Release the lock to stop the end timer, since the end timer handler
 556          * acquires the lock and we don't want to deadlock waiting for it.
 557          */
 558         spin_unlock_irq(&priv->lock);
 559         del_timer_sync(&hw->end_timer);
 560         del_timer_sync(&hw->suspend_timer);
 561         spin_lock_irq(&priv->lock);
 562
 563         hw->stopping = false;
 564
 565         /* switch off and disable interrupts */
 566         img_ir_write(priv, IMG_IR_CONTROL, 0);
 567         irq_en = img_ir_read(priv, IMG_IR_IRQ_ENABLE);
 568         img_ir_write(priv, IMG_IR_IRQ_ENABLE, irq_en & IMG_IR_IRQ_EDGE);
 569         img_ir_write(priv, IMG_IR_IRQ_CLEAR, IMG_IR_IRQ_ALL & ~IMG_IR_IRQ_EDGE);
 570
 571         /* ack any data already detected */
 572         ir_status = img_ir_read(priv, IMG_IR_STATUS);
 573         if (ir_status & (IMG_IR_RXDVAL | IMG_IR_RXDVALD2)) {
 574                 ir_status &= ~(IMG_IR_RXDVAL | IMG_IR_RXDVALD2);
 575                 img_ir_write(priv, IMG_IR_STATUS, ir_status);
 576         }
 577
 578         /* always read data to clear buffer if IR wakes the device */
 579         img_ir_read(priv, IMG_IR_DATA_LW);
 580         img_ir_read(priv, IMG_IR_DATA_UP);
 581
 582         /* switch back to normal mode */
 583         hw->mode = IMG_IR_M_NORMAL;
 584
 585         /* clear the wakeup scancode filter */
 586         rdev->scancode_wakeup_filter.data = 0;
 587         rdev->scancode_wakeup_filter.mask = 0;
 588         rdev->wakeup_protocol = RC_PROTO_UNKNOWN;
 589
 590         /* clear raw filters */
 591         _img_ir_set_filter(priv, NULL);
 592         _img_ir_set_wake_filter(priv, NULL);
 593
 594         /* clear the enabled protocols */
 595         hw->enabled_protocols = 0;
 596
 597         /* switch decoder */
 598         hw->decoder = decoder;
 599         if (!decoder)
 600                 goto unlock;
 601
 602         /* set the enabled protocols */
 603         if (!proto)
 604                 proto = decoder->type;
 605         hw->enabled_protocols = proto;
 606
 607         /* write the new timings */
 608         img_ir_decoder_convert(decoder, &hw->reg_timings, hw->clk_hz);
 609         img_ir_write_timings(priv, &hw->reg_timings.timings, RC_FILTER_NORMAL);
 610
 611         /* set up and enable */
 612         img_ir_write(priv, IMG_IR_CONTROL, hw->reg_timings.ctrl);
 613
 614
 615 unlock:
 616         spin_unlock_irq(&priv->lock);
 617 }
 618
 619 /**
 620  * img_ir_decoder_compatable() - Find whether a decoder will work with a device.
 621  * @priv:       IR private data.
 622  * @dec:        Decoder to check.
 623  *
 624  * Returns:     true if @dec is compatible with the device @priv refers to.
 625  */
 626 static bool img_ir_decoder_compatible(struct img_ir_priv *priv,
 627                                       const struct img_ir_decoder *dec)
 628 {
 629         unsigned int ct;
 630
 631         /* don't accept decoders using code types which aren't supported */
 632         ct = dec->control.code_type;
 633         if (priv->hw.ct_quirks[ct] & IMG_IR_QUIRK_CODE_BROKEN)
 634                 return false;
 635
 636         return true;
 637 }
 638
 639 /**
 640  * img_ir_allowed_protos() - Get allowed protocols from global decoder list.
 641  * @priv:       IR private data.
 642  *
 643  * Returns:     Mask of protocols supported by the device @priv refers to.
 644  */
 645 static u64 img_ir_allowed_protos(struct img_ir_priv *priv)
 646 {
 647         u64 protos = 0;
 648         struct img_ir_decoder **decp;
 649
 650         for (decp = img_ir_decoders; *decp; ++decp) {
 651                 const struct img_ir_decoder *dec = *decp;
 652                 if (img_ir_decoder_compatible(priv, dec))
 653                         protos |= dec->type;
 654         }
 655         return protos;
 656 }
 657
 658 /* Callback for changing protocol using sysfs */
 659 static int img_ir_change_protocol(struct rc_dev *dev, u64 *ir_type)
 660 {
 661         struct img_ir_priv *priv = dev->priv;
 662         struct img_ir_priv_hw *hw = &priv->hw;
 663         struct rc_dev *rdev = hw->rdev;
 664         struct img_ir_decoder **decp;
 665         u64 wakeup_protocols;
 666
 667         if (!*ir_type) {
 668                 /* disable all protocols */
 669                 img_ir_set_decoder(priv, NULL, 0);
 670                 goto success;
 671         }
 672         for (decp = img_ir_decoders; *decp; ++decp) {
 673                 const struct img_ir_decoder *dec = *decp;
 674                 if (!img_ir_decoder_compatible(priv, dec))
 675                         continue;
 676                 if (*ir_type & dec->type) {
 677                         *ir_type &= dec->type;
 678                         img_ir_set_decoder(priv, dec, *ir_type);
 679                         goto success;
 680                 }
 681         }
 682         return -EINVAL;
 683
 684 success:
 685         /*
 686          * Only allow matching wakeup protocols for now, and only if filtering
 687          * is supported.
 688          */
 689         wakeup_protocols = *ir_type;
 690         if (!hw->decoder || !hw->decoder->filter)
 691                 wakeup_protocols = 0;
 692         rdev->allowed_wakeup_protocols = wakeup_protocols;
 693         return 0;
 694 }
 695
 696 /* Changes ir-core protocol device attribute */
 697 static void img_ir_set_protocol(struct img_ir_priv *priv, u64 proto)
 698 {
 699         struct rc_dev *rdev = priv->hw.rdev;
 700
 701         mutex_lock(&rdev->lock);
 702         rdev->enabled_protocols = proto;
 703         rdev->allowed_wakeup_protocols = proto;
 704         mutex_unlock(&rdev->lock);
 705 }
 706
 707 /* Set up IR decoders */
 708 static void img_ir_init_decoders(void)
 709 {
 710         struct img_ir_decoder **decp;
 711
 712         spin_lock(&img_ir_decoders_lock);
 713         if (!img_ir_decoders_preprocessed) {
 714                 for (decp = img_ir_decoders; *decp; ++decp)
 715                         img_ir_decoder_preprocess(*decp);
 716                 img_ir_decoders_preprocessed = true;
 717         }
 718         spin_unlock(&img_ir_decoders_lock);
 719 }
 720
 721 #ifdef CONFIG_PM_SLEEP
 722 /**
 723  * img_ir_enable_wake() - Switch to wake mode.
 724  * @priv:       IR private data.
 725  *
 726  * Returns:     non-zero if the IR can wake the system.
 727  */
 728 static int img_ir_enable_wake(struct img_ir_priv *priv)
 729 {
 730         struct img_ir_priv_hw *hw = &priv->hw;
 731         int ret = 0;
 732
 733         spin_lock_irq(&priv->lock);
 734         if (hw->flags & IMG_IR_F_WAKE) {
 735                 /* interrupt only on a match */
 736                 hw->suspend_irqen = img_ir_read(priv, IMG_IR_IRQ_ENABLE);
 737                 img_ir_write(priv, IMG_IR_IRQ_ENABLE, IMG_IR_IRQ_DATA_MATCH);
 738                 img_ir_write_filter(priv, &hw->filters[RC_FILTER_WAKEUP]);
 739                 img_ir_write_timings(priv, &hw->reg_timings.timings,
 740                                      RC_FILTER_WAKEUP);
 741                 hw->mode = IMG_IR_M_WAKE;
 742                 ret = 1;
 743         }
 744         spin_unlock_irq(&priv->lock);
 745         return ret;
 746 }
 747
 748 /**
 749  * img_ir_disable_wake() - Switch out of wake mode.
 750  * @priv:       IR private data
 751  *
 752  * Returns:     1 if the hardware should be allowed to wake from a sleep state.
 753  *              0 otherwise.
 754  */
 755 static int img_ir_disable_wake(struct img_ir_priv *priv)
 756 {
 757         struct img_ir_priv_hw *hw = &priv->hw;
 758         int ret = 0;
 759
 760         spin_lock_irq(&priv->lock);
 761         if (hw->flags & IMG_IR_F_WAKE) {
 762                 /* restore normal filtering */
 763                 if (hw->flags & IMG_IR_F_FILTER) {
 764                         img_ir_write(priv, IMG_IR_IRQ_ENABLE,
 765                                      (hw->suspend_irqen & IMG_IR_IRQ_EDGE) |
 766                                      IMG_IR_IRQ_DATA_MATCH);
 767                         img_ir_write_filter(priv,
 768                                             &hw->filters[RC_FILTER_NORMAL]);
 769                 } else {
 770                         img_ir_write(priv, IMG_IR_IRQ_ENABLE,
 771                                      (hw->suspend_irqen & IMG_IR_IRQ_EDGE) |
 772                                      IMG_IR_IRQ_DATA_VALID |
 773                                      IMG_IR_IRQ_DATA2_VALID);
 774                         img_ir_write_filter(priv, NULL);
 775                 }
 776                 img_ir_write_timings(priv, &hw->reg_timings.timings,
 777                                      RC_FILTER_NORMAL);
 778                 hw->mode = IMG_IR_M_NORMAL;
 779                 ret = 1;
 780         }
 781         spin_unlock_irq(&priv->lock);
 782         return ret;
 783 }
 784 #endif /* CONFIG_PM_SLEEP */
 785
 786 /* lock must be held */
 787 static void img_ir_begin_repeat(struct img_ir_priv *priv)
 788 {
 789         struct img_ir_priv_hw *hw = &priv->hw;
 790         if (hw->mode == IMG_IR_M_NORMAL) {
 791                 /* switch to repeat timings */
 792                 img_ir_write(priv, IMG_IR_CONTROL, 0);
 793                 hw->mode = IMG_IR_M_REPEATING;
 794                 img_ir_write_timings(priv, &hw->reg_timings.rtimings,
 795                                      RC_FILTER_NORMAL);
 796                 img_ir_write(priv, IMG_IR_CONTROL, hw->reg_timings.ctrl);
 797         }
 798 }
 799
 800 /* lock must be held */
 801 static void img_ir_end_repeat(struct img_ir_priv *priv)
 802 {
 803         struct img_ir_priv_hw *hw = &priv->hw;
 804         if (hw->mode == IMG_IR_M_REPEATING) {
 805                 /* switch to normal timings */
 806                 img_ir_write(priv, IMG_IR_CONTROL, 0);
 807                 hw->mode = IMG_IR_M_NORMAL;
 808                 img_ir_write_timings(priv, &hw->reg_timings.timings,
 809                                      RC_FILTER_NORMAL);
 810                 img_ir_write(priv, IMG_IR_CONTROL, hw->reg_timings.ctrl);
 811         }
 812 }
 813
 814 /* lock must be held */
 815 static void img_ir_handle_data(struct img_ir_priv *priv, u32 len, u64 raw)
 816 {
 817         struct img_ir_priv_hw *hw = &priv->hw;
 818         const struct img_ir_decoder *dec = hw->decoder;
 819         int ret = IMG_IR_SCANCODE;
 820         struct img_ir_scancode_req request;
 821
 822         request.protocol = RC_PROTO_UNKNOWN;
 823         request.toggle   = 0;
 824
 825         if (dec->scancode)
 826                 ret = dec->scancode(len, raw, hw->enabled_protocols, &request);
 827         else if (len >= 32)
 828                 request.scancode = (u32)raw;
 829         else if (len < 32)
 830                 request.scancode = (u32)raw & ((1 << len)-1);
 831         dev_dbg(priv->dev, "data (%u bits) = %#llx\n",
 832                 len, (unsigned long long)raw);
 833         if (ret == IMG_IR_SCANCODE) {
 834                 dev_dbg(priv->dev, "decoded scan code %#x, toggle %u\n",
 835                         request.scancode, request.toggle);
 836                 rc_keydown(hw->rdev, request.protocol, request.scancode,
 837                            request.toggle);
 838                 img_ir_end_repeat(priv);
 839         } else if (ret == IMG_IR_REPEATCODE) {
 840                 if (hw->mode == IMG_IR_M_REPEATING) {
 841                         dev_dbg(priv->dev, "decoded repeat code\n");
 842                         rc_repeat(hw->rdev);
 843                 } else {
 844                         dev_dbg(priv->dev, "decoded unexpected repeat code, ignoring\n");
 845                 }
 846         } else {
 847                 dev_dbg(priv->dev, "decode failed (%d)\n", ret);
 848                 return;
 849         }
 850
 851
 852         /* we mustn't update the end timer while trying to stop it */
 853         if (dec->repeat && !hw->stopping) {
 854                 unsigned long interval;
 855
 856                 img_ir_begin_repeat(priv);
 857
 858                 /* update timer, but allowing for 1/8th tolerance */
 859                 interval = dec->repeat + (dec->repeat >> 3);
 860                 mod_timer(&hw->end_timer,
 861                           jiffies + msecs_to_jiffies(interval));
 862         }
 863 }
 864
 865 /* timer function to end waiting for repeat. */
 866 static void img_ir_end_timer(struct timer_list *t)
 867 {
 868         struct img_ir_priv *priv = from_timer(priv, t, hw.end_timer);
 869
 870         spin_lock_irq(&priv->lock);
 871         img_ir_end_repeat(priv);
 872         spin_unlock_irq(&priv->lock);
 873 }
 874
 875 /*
 876  * Timer function to re-enable the current protocol after it had been
 877  * cleared when invalid interrupts were generated due to a quirk in the
 878  * img-ir decoder.
 879  */
 880 static void img_ir_suspend_timer(struct timer_list *t)
 881 {
 882         struct img_ir_priv *priv = from_timer(priv, t, hw.suspend_timer);
 883
 884         spin_lock_irq(&priv->lock);
 885         /*
 886          * Don't overwrite enabled valid/match IRQs if they have already been
 887          * changed by e.g. a filter change.
 888          */
 889         if ((priv->hw.quirk_suspend_irq & IMG_IR_IRQ_EDGE) ==
 890                                 img_ir_read(priv, IMG_IR_IRQ_ENABLE))
 891                 img_ir_write(priv, IMG_IR_IRQ_ENABLE,
 892                                         priv->hw.quirk_suspend_irq);
 893         /* enable */
 894         img_ir_write(priv, IMG_IR_CONTROL, priv->hw.reg_timings.ctrl);
 895         spin_unlock_irq(&priv->lock);
 896 }
 897
 898 #ifdef CONFIG_COMMON_CLK
 899 static void img_ir_change_frequency(struct img_ir_priv *priv,
 900                                     struct clk_notifier_data *change)
 901 {
 902         struct img_ir_priv_hw *hw = &priv->hw;
 903
 904         dev_dbg(priv->dev, "clk changed %lu HZ -> %lu HZ\n",
 905                 change->old_rate, change->new_rate);
 906
 907         spin_lock_irq(&priv->lock);
 908         if (hw->clk_hz == change->new_rate)
 909                 goto unlock;
 910         hw->clk_hz = change->new_rate;
 911         /* refresh current timings */
 912         if (hw->decoder) {
 913                 img_ir_decoder_convert(hw->decoder, &hw->reg_timings,
 914                                        hw->clk_hz);
 915                 switch (hw->mode) {
 916                 case IMG_IR_M_NORMAL:
 917                         img_ir_write_timings(priv, &hw->reg_timings.timings,
 918                                              RC_FILTER_NORMAL);
 919                         break;
 920                 case IMG_IR_M_REPEATING:
 921                         img_ir_write_timings(priv, &hw->reg_timings.rtimings,
 922                                              RC_FILTER_NORMAL);
 923                         break;
 924 #ifdef CONFIG_PM_SLEEP
 925                 case IMG_IR_M_WAKE:
 926                         img_ir_write_timings(priv, &hw->reg_timings.timings,
 927                                              RC_FILTER_WAKEUP);
 928                         break;
 929 #endif
 930                 }
 931         }
 932 unlock:
 933         spin_unlock_irq(&priv->lock);
 934 }
 935
 936 static int img_ir_clk_notify(struct notifier_block *self, unsigned long action,
 937                              void *data)
 938 {
 939         struct img_ir_priv *priv = container_of(self, struct img_ir_priv,
 940                                                 hw.clk_nb);
 941         switch (action) {
 942         case POST_RATE_CHANGE:
 943                 img_ir_change_frequency(priv, data);
 944                 break;
 945         default:
 946                 break;
 947         }
 948         return NOTIFY_OK;
 949 }
 950 #endif /* CONFIG_COMMON_CLK */
 951
 952 /* called with priv->lock held */
 953 void img_ir_isr_hw(struct img_ir_priv *priv, u32 irq_status)
 954 {
 955         struct img_ir_priv_hw *hw = &priv->hw;
 956         u32 ir_status, len, lw, up;
 957         unsigned int ct;
 958
 959         /* use the current decoder */
 960         if (!hw->decoder)
 961                 return;
 962
 963         ct = hw->decoder->control.code_type;
 964
 965         ir_status = img_ir_read(priv, IMG_IR_STATUS);
 966         if (!(ir_status & (IMG_IR_RXDVAL | IMG_IR_RXDVALD2))) {
 967                 if (!(priv->hw.ct_quirks[ct] & IMG_IR_QUIRK_CODE_IRQ) ||
 968                                 hw->stopping)
 969                         return;
 970                 /*
 971                  * The below functionality is added as a work around to stop
 972                  * multiple Interrupts generated when an incomplete IR code is
 973                  * received by the decoder.
 974                  * The decoder generates rapid interrupts without actually
 975                  * having received any new data. After a single interrupt it's
 976                  * expected to clear up, but instead multiple interrupts are
 977                  * rapidly generated. only way to get out of this loop is to
 978                  * reset the control register after a short delay.
 979                  */
 980                 img_ir_write(priv, IMG_IR_CONTROL, 0);
 981                 hw->quirk_suspend_irq = img_ir_read(priv, IMG_IR_IRQ_ENABLE);
 982                 img_ir_write(priv, IMG_IR_IRQ_ENABLE,
 983                              hw->quirk_suspend_irq & IMG_IR_IRQ_EDGE);
 984
 985                 /* Timer activated to re-enable the protocol. */
 986                 mod_timer(&hw->suspend_timer,
 987                           jiffies + msecs_to_jiffies(5));
 988                 return;
 989         }
 990         ir_status &= ~(IMG_IR_RXDVAL | IMG_IR_RXDVALD2);
 991         img_ir_write(priv, IMG_IR_STATUS, ir_status);
 992
 993         len = (ir_status & IMG_IR_RXDLEN) >> IMG_IR_RXDLEN_SHIFT;
 994         /* some versions report wrong length for certain code types */
 995         if (hw->ct_quirks[ct] & IMG_IR_QUIRK_CODE_LEN_INCR)
 996                 ++len;
 997
 998         lw = img_ir_read(priv, IMG_IR_DATA_LW);
 999         up = img_ir_read(priv, IMG_IR_DATA_UP);
1000         img_ir_handle_data(priv, len, (u64)up << 32 | lw);
1001 }
1002
1003 void img_ir_setup_hw(struct img_ir_priv *priv)
1004 {
1005         struct img_ir_decoder **decp;
1006
1007         if (!priv->hw.rdev)
1008                 return;
1009
1010         /* Use the first available decoder (or disable stuff if NULL) */
1011         for (decp = img_ir_decoders; *decp; ++decp) {
1012                 const struct img_ir_decoder *dec = *decp;
1013                 if (img_ir_decoder_compatible(priv, dec)) {
1014                         img_ir_set_protocol(priv, dec->type);
1015                         img_ir_set_decoder(priv, dec, 0);
1016                         return;
1017                 }
1018         }
1019         img_ir_set_decoder(priv, NULL, 0);
1020 }
1021
1022 /**
1023  * img_ir_probe_hw_caps() - Probe capabilities of the hardware.
1024  * @priv:       IR private data.
1025  */
1026 static void img_ir_probe_hw_caps(struct img_ir_priv *priv)
1027 {
1028         struct img_ir_priv_hw *hw = &priv->hw;
1029         /*
1030          * When a version of the block becomes available without these quirks,
1031          * they'll have to depend on the core revision.
1032          */
1033         hw->ct_quirks[IMG_IR_CODETYPE_PULSELEN]
1034                 |= IMG_IR_QUIRK_CODE_LEN_INCR;
1035         hw->ct_quirks[IMG_IR_CODETYPE_BIPHASE]
1036                 |= IMG_IR_QUIRK_CODE_IRQ;
1037         hw->ct_quirks[IMG_IR_CODETYPE_2BITPULSEPOS]
1038                 |= IMG_IR_QUIRK_CODE_BROKEN;
1039 }
1040
1041 int img_ir_probe_hw(struct img_ir_priv *priv)
1042 {
1043         struct img_ir_priv_hw *hw = &priv->hw;
1044         struct rc_dev *rdev;
1045         int error;
1046
1047         /* Ensure hardware decoders have been preprocessed */
1048         img_ir_init_decoders();
1049
1050         /* Probe hardware capabilities */
1051         img_ir_probe_hw_caps(priv);
1052
1053         /* Set up the end timer */
1054         timer_setup(&hw->end_timer, img_ir_end_timer, 0);
1055         timer_setup(&hw->suspend_timer, img_ir_suspend_timer, 0);
1056
1057         /* Register a clock notifier */
1058         if (!IS_ERR(priv->clk)) {
1059                 hw->clk_hz = clk_get_rate(priv->clk);
1060 #ifdef CONFIG_COMMON_CLK
1061                 hw->clk_nb.notifier_call = img_ir_clk_notify;
1062                 error = clk_notifier_register(priv->clk, &hw->clk_nb);
1063                 if (error)
1064                         dev_warn(priv->dev,
1065                                  "failed to register clock notifier\n");
1066 #endif
1067         } else {
1068                 hw->clk_hz = 32768;
1069         }
1070
1071         /* Allocate hardware decoder */
1072         hw->rdev = rdev = rc_allocate_device(RC_DRIVER_SCANCODE);
1073         if (!rdev) {
1074                 dev_err(priv->dev, "cannot allocate input device\n");
1075                 error = -ENOMEM;
1076                 goto err_alloc_rc;
1077         }
1078         rdev->priv = priv;
1079         rdev->map_name = RC_MAP_EMPTY;
1080         rdev->allowed_protocols = img_ir_allowed_protos(priv);
1081         rdev->device_name = "IMG Infrared Decoder";
1082         rdev->s_filter = img_ir_set_normal_filter;
1083         rdev->s_wakeup_filter = img_ir_set_wakeup_filter;
1084
1085         /* Register hardware decoder */
1086         error = rc_register_device(rdev);
1087         if (error) {
1088                 dev_err(priv->dev, "failed to register IR input device\n");
1089                 goto err_register_rc;
1090         }
1091
1092         /*
1093          * Set this after rc_register_device as no protocols have been
1094          * registered yet.
1095          */
1096         rdev->change_protocol = img_ir_change_protocol;
1097
1098         device_init_wakeup(priv->dev, 1);
1099
1100         return 0;
1101
1102 err_register_rc:
1103         img_ir_set_decoder(priv, NULL, 0);
1104         hw->rdev = NULL;
1105         rc_free_device(rdev);
1106 err_alloc_rc:
1107 #ifdef CONFIG_COMMON_CLK
1108         if (!IS_ERR(priv->clk))
1109                 clk_notifier_unregister(priv->clk, &hw->clk_nb);
1110 #endif
1111         return error;
1112 }
1113
1114 void img_ir_remove_hw(struct img_ir_priv *priv)
1115 {
1116         struct img_ir_priv_hw *hw = &priv->hw;
1117         struct rc_dev *rdev = hw->rdev;
1118         if (!rdev)
1119                 return;
1120         img_ir_set_decoder(priv, NULL, 0);
1121         hw->rdev = NULL;
1122         rc_unregister_device(rdev);
1123 #ifdef CONFIG_COMMON_CLK
1124         if (!IS_ERR(priv->clk))
1125                 clk_notifier_unregister(priv->clk, &hw->clk_nb);
1126 #endif
1127 }
1128
1129 #ifdef CONFIG_PM_SLEEP
1130 int img_ir_suspend(struct device *dev)
1131 {
1132         struct img_ir_priv *priv = dev_get_drvdata(dev);
1133
1134         if (device_may_wakeup(dev) && img_ir_enable_wake(priv))
1135                 enable_irq_wake(priv->irq);
1136         return 0;
1137 }
1138
1139 int img_ir_resume(struct device *dev)
1140 {
1141         struct img_ir_priv *priv = dev_get_drvdata(dev);
1142
1143         if (device_may_wakeup(dev) && img_ir_disable_wake(priv))
1144                 disable_irq_wake(priv->irq);
1145         return 0;
1146 }
1147 #endif  /* CONFIG_PM_SLEEP */