diff options
Diffstat (limited to 'drivers/media/rc/img-ir/img-ir-hw.c')
| -rw-r--r-- | drivers/media/rc/img-ir/img-ir-hw.c | 1147 |
1 files changed, 1147 insertions, 0 deletions
diff --git a/drivers/media/rc/img-ir/img-ir-hw.c b/drivers/media/rc/img-ir/img-ir-hw.c new file mode 100644 index 000000000..5da7479c1 --- /dev/null +++ b/drivers/media/rc/img-ir/img-ir-hw.c @@ -0,0 +1,1147 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * ImgTec IR Hardware Decoder found in PowerDown Controller. + * + * Copyright 2010-2014 Imagination Technologies Ltd. + * + * This ties into the input subsystem using the RC-core. Protocol support is + * provided in separate modules which provide the parameters and scancode + * translation functions to set up the hardware decoder and interpret the + * resulting input. + */ + +#include <linux/bitops.h> +#include <linux/clk.h> +#include <linux/interrupt.h> +#include <linux/spinlock.h> +#include <linux/timer.h> +#include <media/rc-core.h> +#include "img-ir.h" + +/* Decoders lock (only modified to preprocess them) */ +static DEFINE_SPINLOCK(img_ir_decoders_lock); + +static bool img_ir_decoders_preprocessed; +static struct img_ir_decoder *img_ir_decoders[] = { +#ifdef CONFIG_IR_IMG_NEC + &img_ir_nec, +#endif +#ifdef CONFIG_IR_IMG_JVC + &img_ir_jvc, +#endif +#ifdef CONFIG_IR_IMG_SONY + &img_ir_sony, +#endif +#ifdef CONFIG_IR_IMG_SHARP + &img_ir_sharp, +#endif +#ifdef CONFIG_IR_IMG_SANYO + &img_ir_sanyo, +#endif +#ifdef CONFIG_IR_IMG_RC5 + &img_ir_rc5, +#endif +#ifdef CONFIG_IR_IMG_RC6 + &img_ir_rc6, +#endif + NULL +}; + +#define IMG_IR_F_FILTER BIT(RC_FILTER_NORMAL) /* enable filtering */ +#define IMG_IR_F_WAKE BIT(RC_FILTER_WAKEUP) /* enable waking */ + +/* code type quirks */ + +#define IMG_IR_QUIRK_CODE_BROKEN 0x1 /* Decode is broken */ +#define IMG_IR_QUIRK_CODE_LEN_INCR 0x2 /* Bit length needs increment */ +/* + * The decoder generates rapid interrupts without actually having + * received any new data after an incomplete IR code is decoded. + */ +#define IMG_IR_QUIRK_CODE_IRQ 0x4 + +/* functions for preprocessing timings, ensuring max is set */ + +static void img_ir_timing_preprocess(struct img_ir_timing_range *range, + unsigned int unit) +{ + if (range->max < range->min) + range->max = range->min; + if (unit) { + /* multiply by unit and convert to microseconds */ + range->min = (range->min*unit)/1000; + range->max = (range->max*unit + 999)/1000; /* round up */ + } +} + +static void img_ir_symbol_timing_preprocess(struct img_ir_symbol_timing *timing, + unsigned int unit) +{ + img_ir_timing_preprocess(&timing->pulse, unit); + img_ir_timing_preprocess(&timing->space, unit); +} + +static void img_ir_timings_preprocess(struct img_ir_timings *timings, + unsigned int unit) +{ + img_ir_symbol_timing_preprocess(&timings->ldr, unit); + img_ir_symbol_timing_preprocess(&timings->s00, unit); + img_ir_symbol_timing_preprocess(&timings->s01, unit); + img_ir_symbol_timing_preprocess(&timings->s10, unit); + img_ir_symbol_timing_preprocess(&timings->s11, unit); + /* default s10 and s11 to s00 and s01 if no leader */ + if (unit) + /* multiply by unit and convert to microseconds (round up) */ + timings->ft.ft_min = (timings->ft.ft_min*unit + 999)/1000; +} + +/* functions for filling empty fields with defaults */ + +static void img_ir_timing_defaults(struct img_ir_timing_range *range, + struct img_ir_timing_range *defaults) +{ + if (!range->min) + range->min = defaults->min; + if (!range->max) + range->max = defaults->max; +} + +static void img_ir_symbol_timing_defaults(struct img_ir_symbol_timing *timing, + struct img_ir_symbol_timing *defaults) +{ + img_ir_timing_defaults(&timing->pulse, &defaults->pulse); + img_ir_timing_defaults(&timing->space, &defaults->space); +} + +static void img_ir_timings_defaults(struct img_ir_timings *timings, + struct img_ir_timings *defaults) +{ + img_ir_symbol_timing_defaults(&timings->ldr, &defaults->ldr); + img_ir_symbol_timing_defaults(&timings->s00, &defaults->s00); + img_ir_symbol_timing_defaults(&timings->s01, &defaults->s01); + img_ir_symbol_timing_defaults(&timings->s10, &defaults->s10); + img_ir_symbol_timing_defaults(&timings->s11, &defaults->s11); + if (!timings->ft.ft_min) + timings->ft.ft_min = defaults->ft.ft_min; +} + +/* functions for converting timings to register values */ + +/** + * img_ir_control() - Convert control struct to control register value. + * @control: Control data + * + * Returns: The control register value equivalent of @control. + */ +static u32 img_ir_control(const struct img_ir_control *control) +{ + u32 ctrl = control->code_type << IMG_IR_CODETYPE_SHIFT; + if (control->decoden) + ctrl |= IMG_IR_DECODEN; + if (control->hdrtog) + ctrl |= IMG_IR_HDRTOG; + if (control->ldrdec) + ctrl |= IMG_IR_LDRDEC; + if (control->decodinpol) + ctrl |= IMG_IR_DECODINPOL; + if (control->bitorien) + ctrl |= IMG_IR_BITORIEN; + if (control->d1validsel) + ctrl |= IMG_IR_D1VALIDSEL; + if (control->bitinv) + ctrl |= IMG_IR_BITINV; + if (control->decodend2) + ctrl |= IMG_IR_DECODEND2; + if (control->bitoriend2) + ctrl |= IMG_IR_BITORIEND2; + if (control->bitinvd2) + ctrl |= IMG_IR_BITINVD2; + return ctrl; +} + +/** + * img_ir_timing_range_convert() - Convert microsecond range. + * @out: Output timing range in clock cycles with a shift. + * @in: Input timing range in microseconds. + * @tolerance: Tolerance as a fraction of 128 (roughly percent). + * @clock_hz: IR clock rate in Hz. + * @shift: Shift of output units. + * + * Converts min and max from microseconds to IR clock cycles, applies a + * tolerance, and shifts for the register, rounding in the right direction. + * Note that in and out can safely be the same object. + */ +static void img_ir_timing_range_convert(struct img_ir_timing_range *out, + const struct img_ir_timing_range *in, + unsigned int tolerance, + unsigned long clock_hz, + unsigned int shift) +{ + unsigned int min = in->min; + unsigned int max = in->max; + /* add a tolerance */ + min = min - (min*tolerance >> 7); + max = max + (max*tolerance >> 7); + /* convert from microseconds into clock cycles */ + min = min*clock_hz / 1000000; + max = (max*clock_hz + 999999) / 1000000; /* round up */ + /* apply shift and copy to output */ + out->min = min >> shift; + out->max = (max + ((1 << shift) - 1)) >> shift; /* round up */ +} + +/** + * img_ir_symbol_timing() - Convert symbol timing struct to register value. + * @timing: Symbol timing data + * @tolerance: Timing tolerance where 0-128 represents 0-100% + * @clock_hz: Frequency of source clock in Hz + * @pd_shift: Shift to apply to symbol period + * @w_shift: Shift to apply to symbol width + * + * Returns: Symbol timing register value based on arguments. + */ +static u32 img_ir_symbol_timing(const struct img_ir_symbol_timing *timing, + unsigned int tolerance, + unsigned long clock_hz, + unsigned int pd_shift, + unsigned int w_shift) +{ + struct img_ir_timing_range hw_pulse, hw_period; + /* we calculate period in hw_period, then convert in place */ + hw_period.min = timing->pulse.min + timing->space.min; + hw_period.max = timing->pulse.max + timing->space.max; + img_ir_timing_range_convert(&hw_period, &hw_period, + tolerance, clock_hz, pd_shift); + img_ir_timing_range_convert(&hw_pulse, &timing->pulse, + tolerance, clock_hz, w_shift); + /* construct register value */ + return (hw_period.max << IMG_IR_PD_MAX_SHIFT) | + (hw_period.min << IMG_IR_PD_MIN_SHIFT) | + (hw_pulse.max << IMG_IR_W_MAX_SHIFT) | + (hw_pulse.min << IMG_IR_W_MIN_SHIFT); +} + +/** + * img_ir_free_timing() - Convert free time timing struct to register value. + * @timing: Free symbol timing data + * @clock_hz: Source clock frequency in Hz + * + * Returns: Free symbol timing register value. + */ +static u32 img_ir_free_timing(const struct img_ir_free_timing *timing, + unsigned long clock_hz) +{ + unsigned int minlen, maxlen, ft_min; + /* minlen is only 5 bits, and round minlen to multiple of 2 */ + if (timing->minlen < 30) + minlen = timing->minlen & -2; + else + minlen = 30; + /* maxlen has maximum value of 48, and round maxlen to multiple of 2 */ + if (timing->maxlen < 48) + maxlen = (timing->maxlen + 1) & -2; + else + maxlen = 48; + /* convert and shift ft_min, rounding upwards */ + ft_min = (timing->ft_min*clock_hz + 999999) / 1000000; + ft_min = (ft_min + 7) >> 3; + /* construct register value */ + return (maxlen << IMG_IR_MAXLEN_SHIFT) | + (minlen << IMG_IR_MINLEN_SHIFT) | + (ft_min << IMG_IR_FT_MIN_SHIFT); +} + +/** + * img_ir_free_timing_dynamic() - Update free time register value. + * @st_ft: Static free time register value from img_ir_free_timing. + * @filter: Current filter which may additionally restrict min/max len. + * + * Returns: Updated free time register value based on the current filter. + */ +static u32 img_ir_free_timing_dynamic(u32 st_ft, struct img_ir_filter *filter) +{ + unsigned int minlen, maxlen, newminlen, newmaxlen; + + /* round minlen, maxlen to multiple of 2 */ + newminlen = filter->minlen & -2; + newmaxlen = (filter->maxlen + 1) & -2; + /* extract min/max len from register */ + minlen = (st_ft & IMG_IR_MINLEN) >> IMG_IR_MINLEN_SHIFT; + maxlen = (st_ft & IMG_IR_MAXLEN) >> IMG_IR_MAXLEN_SHIFT; + /* if the new values are more restrictive, update the register value */ + if (newminlen > minlen) { + st_ft &= ~IMG_IR_MINLEN; + st_ft |= newminlen << IMG_IR_MINLEN_SHIFT; + } + if (newmaxlen < maxlen) { + st_ft &= ~IMG_IR_MAXLEN; + st_ft |= newmaxlen << IMG_IR_MAXLEN_SHIFT; + } + return st_ft; +} + +/** + * img_ir_timings_convert() - Convert timings to register values + * @regs: Output timing register values + * @timings: Input timing data + * @tolerance: Timing tolerance where 0-128 represents 0-100% + * @clock_hz: Source clock frequency in Hz + */ +static void img_ir_timings_convert(struct img_ir_timing_regvals *regs, + const struct img_ir_timings *timings, + unsigned int tolerance, + unsigned int clock_hz) +{ + /* leader symbol timings are divided by 16 */ + regs->ldr = img_ir_symbol_timing(&timings->ldr, tolerance, clock_hz, + 4, 4); + /* other symbol timings, pd fields only are divided by 2 */ + regs->s00 = img_ir_symbol_timing(&timings->s00, tolerance, clock_hz, + 1, 0); + regs->s01 = img_ir_symbol_timing(&timings->s01, tolerance, clock_hz, + 1, 0); + regs->s10 = img_ir_symbol_timing(&timings->s10, tolerance, clock_hz, + 1, 0); + regs->s11 = img_ir_symbol_timing(&timings->s11, tolerance, clock_hz, + 1, 0); + regs->ft = img_ir_free_timing(&timings->ft, clock_hz); +} + +/** + * img_ir_decoder_preprocess() - Preprocess timings in decoder. + * @decoder: Decoder to be preprocessed. + * + * Ensures that the symbol timing ranges are valid with respect to ordering, and + * does some fixed conversion on them. + */ +static void img_ir_decoder_preprocess(struct img_ir_decoder *decoder) +{ + /* default tolerance */ + if (!decoder->tolerance) + decoder->tolerance = 10; /* percent */ + /* and convert tolerance to fraction out of 128 */ + decoder->tolerance = decoder->tolerance * 128 / 100; + + /* fill in implicit fields */ + img_ir_timings_preprocess(&decoder->timings, decoder->unit); + + /* do the same for repeat timings if applicable */ + if (decoder->repeat) { + img_ir_timings_preprocess(&decoder->rtimings, decoder->unit); + img_ir_timings_defaults(&decoder->rtimings, &decoder->timings); + } +} + +/** + * img_ir_decoder_convert() - Generate internal timings in decoder. + * @decoder: Decoder to be converted to internal timings. + * @reg_timings: Timing register values. + * @clock_hz: IR clock rate in Hz. + * + * Fills out the repeat timings and timing register values for a specific clock + * rate. + */ +static void img_ir_decoder_convert(const struct img_ir_decoder *decoder, + struct img_ir_reg_timings *reg_timings, + unsigned int clock_hz) +{ + /* calculate control value */ + reg_timings->ctrl = img_ir_control(&decoder->control); + + /* fill in implicit fields and calculate register values */ + img_ir_timings_convert(®_timings->timings, &decoder->timings, + decoder->tolerance, clock_hz); + + /* do the same for repeat timings if applicable */ + if (decoder->repeat) + img_ir_timings_convert(®_timings->rtimings, + &decoder->rtimings, decoder->tolerance, + clock_hz); +} + +/** + * img_ir_write_timings() - Write timings to the hardware now + * @priv: IR private data + * @regs: Timing register values to write + * @type: RC filter type (RC_FILTER_*) + * + * Write timing register values @regs to the hardware, taking into account the + * current filter which may impose restrictions on the length of the expected + * data. + */ +static void img_ir_write_timings(struct img_ir_priv *priv, + struct img_ir_timing_regvals *regs, + enum rc_filter_type type) +{ + struct img_ir_priv_hw *hw = &priv->hw; + + /* filter may be more restrictive to minlen, maxlen */ + u32 ft = regs->ft; + if (hw->flags & BIT(type)) + ft = img_ir_free_timing_dynamic(regs->ft, &hw->filters[type]); + /* write to registers */ + img_ir_write(priv, IMG_IR_LEAD_SYMB_TIMING, regs->ldr); + img_ir_write(priv, IMG_IR_S00_SYMB_TIMING, regs->s00); + img_ir_write(priv, IMG_IR_S01_SYMB_TIMING, regs->s01); + img_ir_write(priv, IMG_IR_S10_SYMB_TIMING, regs->s10); + img_ir_write(priv, IMG_IR_S11_SYMB_TIMING, regs->s11); + img_ir_write(priv, IMG_IR_FREE_SYMB_TIMING, ft); + dev_dbg(priv->dev, "timings: ldr=%#x, s=[%#x, %#x, %#x, %#x], ft=%#x\n", + regs->ldr, regs->s00, regs->s01, regs->s10, regs->s11, ft); +} + +static void img_ir_write_filter(struct img_ir_priv *priv, + struct img_ir_filter *filter) +{ + if (filter) { + dev_dbg(priv->dev, "IR filter=%016llx & %016llx\n", + (unsigned long long)filter->data, + (unsigned long long)filter->mask); + img_ir_write(priv, IMG_IR_IRQ_MSG_DATA_LW, (u32)filter->data); + img_ir_write(priv, IMG_IR_IRQ_MSG_DATA_UP, (u32)(filter->data + >> 32)); + img_ir_write(priv, IMG_IR_IRQ_MSG_MASK_LW, (u32)filter->mask); + img_ir_write(priv, IMG_IR_IRQ_MSG_MASK_UP, (u32)(filter->mask + >> 32)); + } else { + dev_dbg(priv->dev, "IR clearing filter\n"); + img_ir_write(priv, IMG_IR_IRQ_MSG_MASK_LW, 0); + img_ir_write(priv, IMG_IR_IRQ_MSG_MASK_UP, 0); + } +} + +/* caller must have lock */ +static void _img_ir_set_filter(struct img_ir_priv *priv, + struct img_ir_filter *filter) +{ + struct img_ir_priv_hw *hw = &priv->hw; + u32 irq_en, irq_on; + + irq_en = img_ir_read(priv, IMG_IR_IRQ_ENABLE); + if (filter) { + /* Only use the match interrupt */ + hw->filters[RC_FILTER_NORMAL] = *filter; + hw->flags |= IMG_IR_F_FILTER; + irq_on = IMG_IR_IRQ_DATA_MATCH; + irq_en &= ~(IMG_IR_IRQ_DATA_VALID | IMG_IR_IRQ_DATA2_VALID); + } else { + /* Only use the valid interrupt */ + hw->flags &= ~IMG_IR_F_FILTER; + irq_en &= ~IMG_IR_IRQ_DATA_MATCH; + irq_on = IMG_IR_IRQ_DATA_VALID | IMG_IR_IRQ_DATA2_VALID; + } + irq_en |= irq_on; + + img_ir_write_filter(priv, filter); + /* clear any interrupts we're enabling so we don't handle old ones */ + img_ir_write(priv, IMG_IR_IRQ_CLEAR, irq_on); + img_ir_write(priv, IMG_IR_IRQ_ENABLE, irq_en); +} + +/* caller must have lock */ +static void _img_ir_set_wake_filter(struct img_ir_priv *priv, + struct img_ir_filter *filter) +{ + struct img_ir_priv_hw *hw = &priv->hw; + if (filter) { + /* Enable wake, and copy filter for later */ + hw->filters[RC_FILTER_WAKEUP] = *filter; + hw->flags |= IMG_IR_F_WAKE; + } else { + /* Disable wake */ + hw->flags &= ~IMG_IR_F_WAKE; + } +} + +/* Callback for setting scancode filter */ +static int img_ir_set_filter(struct rc_dev *dev, enum rc_filter_type type, + struct rc_scancode_filter *sc_filter) +{ + struct img_ir_priv *priv = dev->priv; + struct img_ir_priv_hw *hw = &priv->hw; + struct img_ir_filter filter, *filter_ptr = &filter; + int ret = 0; + + dev_dbg(priv->dev, "IR scancode %sfilter=%08x & %08x\n", + type == RC_FILTER_WAKEUP ? "wake " : "", + sc_filter->data, + sc_filter->mask); + + spin_lock_irq(&priv->lock); + + /* filtering can always be disabled */ + if (!sc_filter->mask) { + filter_ptr = NULL; + goto set_unlock; + } + + /* current decoder must support scancode filtering */ + if (!hw->decoder || !hw->decoder->filter) { + ret = -EINVAL; + goto unlock; + } + + /* convert scancode filter to raw filter */ + filter.minlen = 0; + filter.maxlen = ~0; + if (type == RC_FILTER_NORMAL) { + /* guess scancode from protocol */ + ret = hw->decoder->filter(sc_filter, &filter, + dev->enabled_protocols); + } else { + /* for wakeup user provided exact protocol variant */ + ret = hw->decoder->filter(sc_filter, &filter, + 1ULL << dev->wakeup_protocol); + } + if (ret) + goto unlock; + dev_dbg(priv->dev, "IR raw %sfilter=%016llx & %016llx\n", + type == RC_FILTER_WAKEUP ? "wake " : "", + (unsigned long long)filter.data, + (unsigned long long)filter.mask); + +set_unlock: + /* apply raw filters */ + switch (type) { + case RC_FILTER_NORMAL: + _img_ir_set_filter(priv, filter_ptr); + break; + case RC_FILTER_WAKEUP: + _img_ir_set_wake_filter(priv, filter_ptr); + break; + default: + ret = -EINVAL; + } + +unlock: + spin_unlock_irq(&priv->lock); + return ret; +} + +static int img_ir_set_normal_filter(struct rc_dev *dev, + struct rc_scancode_filter *sc_filter) +{ + return img_ir_set_filter(dev, RC_FILTER_NORMAL, sc_filter); +} + +static int img_ir_set_wakeup_filter(struct rc_dev *dev, + struct rc_scancode_filter *sc_filter) +{ + return img_ir_set_filter(dev, RC_FILTER_WAKEUP, sc_filter); +} + +/** + * img_ir_set_decoder() - Set the current decoder. + * @priv: IR private data. + * @decoder: Decoder to use with immediate effect. + * @proto: Protocol bitmap (or 0 to use decoder->type). + */ +static void img_ir_set_decoder(struct img_ir_priv *priv, + const struct img_ir_decoder *decoder, + u64 proto) +{ + struct img_ir_priv_hw *hw = &priv->hw; + struct rc_dev *rdev = hw->rdev; + u32 ir_status, irq_en; + spin_lock_irq(&priv->lock); + + /* + * First record that the protocol is being stopped so that the end timer + * isn't restarted while we're trying to stop it. + */ + hw->stopping = true; + + /* + * Release the lock to stop the end timer, since the end timer handler + * acquires the lock and we don't want to deadlock waiting for it. + */ + spin_unlock_irq(&priv->lock); + del_timer_sync(&hw->end_timer); + del_timer_sync(&hw->suspend_timer); + spin_lock_irq(&priv->lock); + + hw->stopping = false; + + /* switch off and disable interrupts */ + img_ir_write(priv, IMG_IR_CONTROL, 0); + irq_en = img_ir_read(priv, IMG_IR_IRQ_ENABLE); + img_ir_write(priv, IMG_IR_IRQ_ENABLE, irq_en & IMG_IR_IRQ_EDGE); + img_ir_write(priv, IMG_IR_IRQ_CLEAR, IMG_IR_IRQ_ALL & ~IMG_IR_IRQ_EDGE); + + /* ack any data already detected */ + ir_status = img_ir_read(priv, IMG_IR_STATUS); + if (ir_status & (IMG_IR_RXDVAL | IMG_IR_RXDVALD2)) { + ir_status &= ~(IMG_IR_RXDVAL | IMG_IR_RXDVALD2); + img_ir_write(priv, IMG_IR_STATUS, ir_status); + } + + /* always read data to clear buffer if IR wakes the device */ + img_ir_read(priv, IMG_IR_DATA_LW); + img_ir_read(priv, IMG_IR_DATA_UP); + + /* switch back to normal mode */ + hw->mode = IMG_IR_M_NORMAL; + + /* clear the wakeup scancode filter */ + rdev->scancode_wakeup_filter.data = 0; + rdev->scancode_wakeup_filter.mask = 0; + rdev->wakeup_protocol = RC_PROTO_UNKNOWN; + + /* clear raw filters */ + _img_ir_set_filter(priv, NULL); + _img_ir_set_wake_filter(priv, NULL); + + /* clear the enabled protocols */ + hw->enabled_protocols = 0; + + /* switch decoder */ + hw->decoder = decoder; + if (!decoder) + goto unlock; + + /* set the enabled protocols */ + if (!proto) + proto = decoder->type; + hw->enabled_protocols = proto; + + /* write the new timings */ + img_ir_decoder_convert(decoder, &hw->reg_timings, hw->clk_hz); + img_ir_write_timings(priv, &hw->reg_timings.timings, RC_FILTER_NORMAL); + + /* set up and enable */ + img_ir_write(priv, IMG_IR_CONTROL, hw->reg_timings.ctrl); + + +unlock: + spin_unlock_irq(&priv->lock); +} + +/** + * img_ir_decoder_compatible() - Find whether a decoder will work with a device. + * @priv: IR private data. + * @dec: Decoder to check. + * + * Returns: true if @dec is compatible with the device @priv refers to. + */ +static bool img_ir_decoder_compatible(struct img_ir_priv *priv, + const struct img_ir_decoder *dec) +{ + unsigned int ct; + + /* don't accept decoders using code types which aren't supported */ + ct = dec->control.code_type; + if (priv->hw.ct_quirks[ct] & IMG_IR_QUIRK_CODE_BROKEN) + return false; + + return true; +} + +/** + * img_ir_allowed_protos() - Get allowed protocols from global decoder list. + * @priv: IR private data. + * + * Returns: Mask of protocols supported by the device @priv refers to. + */ +static u64 img_ir_allowed_protos(struct img_ir_priv *priv) +{ + u64 protos = 0; + struct img_ir_decoder **decp; + + for (decp = img_ir_decoders; *decp; ++decp) { + const struct img_ir_decoder *dec = *decp; + if (img_ir_decoder_compatible(priv, dec)) + protos |= dec->type; + } + return protos; +} + +/* Callback for changing protocol using sysfs */ +static int img_ir_change_protocol(struct rc_dev *dev, u64 *ir_type) +{ + struct img_ir_priv *priv = dev->priv; + struct img_ir_priv_hw *hw = &priv->hw; + struct rc_dev *rdev = hw->rdev; + struct img_ir_decoder **decp; + u64 wakeup_protocols; + + if (!*ir_type) { + /* disable all protocols */ + img_ir_set_decoder(priv, NULL, 0); + goto success; + } + for (decp = img_ir_decoders; *decp; ++decp) { + const struct img_ir_decoder *dec = *decp; + if (!img_ir_decoder_compatible(priv, dec)) + continue; + if (*ir_type & dec->type) { + *ir_type &= dec->type; + img_ir_set_decoder(priv, dec, *ir_type); + goto success; + } + } + return -EINVAL; + +success: + /* + * Only allow matching wakeup protocols for now, and only if filtering + * is supported. + */ + wakeup_protocols = *ir_type; + if (!hw->decoder || !hw->decoder->filter) + wakeup_protocols = 0; + rdev->allowed_wakeup_protocols = wakeup_protocols; + return 0; +} + +/* Changes ir-core protocol device attribute */ +static void img_ir_set_protocol(struct img_ir_priv *priv, u64 proto) +{ + struct rc_dev *rdev = priv->hw.rdev; + + mutex_lock(&rdev->lock); + rdev->enabled_protocols = proto; + rdev->allowed_wakeup_protocols = proto; + mutex_unlock(&rdev->lock); +} + +/* Set up IR decoders */ +static void img_ir_init_decoders(void) +{ + struct img_ir_decoder **decp; + + spin_lock(&img_ir_decoders_lock); + if (!img_ir_decoders_preprocessed) { + for (decp = img_ir_decoders; *decp; ++decp) + img_ir_decoder_preprocess(*decp); + img_ir_decoders_preprocessed = true; + } + spin_unlock(&img_ir_decoders_lock); +} + +#ifdef CONFIG_PM_SLEEP +/** + * img_ir_enable_wake() - Switch to wake mode. + * @priv: IR private data. + * + * Returns: non-zero if the IR can wake the system. + */ +static int img_ir_enable_wake(struct img_ir_priv *priv) +{ + struct img_ir_priv_hw *hw = &priv->hw; + int ret = 0; + + spin_lock_irq(&priv->lock); + if (hw->flags & IMG_IR_F_WAKE) { + /* interrupt only on a match */ + hw->suspend_irqen = img_ir_read(priv, IMG_IR_IRQ_ENABLE); + img_ir_write(priv, IMG_IR_IRQ_ENABLE, IMG_IR_IRQ_DATA_MATCH); + img_ir_write_filter(priv, &hw->filters[RC_FILTER_WAKEUP]); + img_ir_write_timings(priv, &hw->reg_timings.timings, + RC_FILTER_WAKEUP); + hw->mode = IMG_IR_M_WAKE; + ret = 1; + } + spin_unlock_irq(&priv->lock); + return ret; +} + +/** + * img_ir_disable_wake() - Switch out of wake mode. + * @priv: IR private data + * + * Returns: 1 if the hardware should be allowed to wake from a sleep state. + * 0 otherwise. + */ +static int img_ir_disable_wake(struct img_ir_priv *priv) +{ + struct img_ir_priv_hw *hw = &priv->hw; + int ret = 0; + + spin_lock_irq(&priv->lock); + if (hw->flags & IMG_IR_F_WAKE) { + /* restore normal filtering */ + if (hw->flags & IMG_IR_F_FILTER) { + img_ir_write(priv, IMG_IR_IRQ_ENABLE, + (hw->suspend_irqen & IMG_IR_IRQ_EDGE) | + IMG_IR_IRQ_DATA_MATCH); + img_ir_write_filter(priv, + &hw->filters[RC_FILTER_NORMAL]); + } else { + img_ir_write(priv, IMG_IR_IRQ_ENABLE, + (hw->suspend_irqen & IMG_IR_IRQ_EDGE) | + IMG_IR_IRQ_DATA_VALID | + IMG_IR_IRQ_DATA2_VALID); + img_ir_write_filter(priv, NULL); + } + img_ir_write_timings(priv, &hw->reg_timings.timings, + RC_FILTER_NORMAL); + hw->mode = IMG_IR_M_NORMAL; + ret = 1; + } + spin_unlock_irq(&priv->lock); + return ret; +} +#endif /* CONFIG_PM_SLEEP */ + +/* lock must be held */ +static void img_ir_begin_repeat(struct img_ir_priv *priv) +{ + struct img_ir_priv_hw *hw = &priv->hw; + if (hw->mode == IMG_IR_M_NORMAL) { + /* switch to repeat timings */ + img_ir_write(priv, IMG_IR_CONTROL, 0); + hw->mode = IMG_IR_M_REPEATING; + img_ir_write_timings(priv, &hw->reg_timings.rtimings, + RC_FILTER_NORMAL); + img_ir_write(priv, IMG_IR_CONTROL, hw->reg_timings.ctrl); + } +} + +/* lock must be held */ +static void img_ir_end_repeat(struct img_ir_priv *priv) +{ + struct img_ir_priv_hw *hw = &priv->hw; + if (hw->mode == IMG_IR_M_REPEATING) { + /* switch to normal timings */ + img_ir_write(priv, IMG_IR_CONTROL, 0); + hw->mode = IMG_IR_M_NORMAL; + img_ir_write_timings(priv, &hw->reg_timings.timings, + RC_FILTER_NORMAL); + img_ir_write(priv, IMG_IR_CONTROL, hw->reg_timings.ctrl); + } +} + +/* lock must be held */ +static void img_ir_handle_data(struct img_ir_priv *priv, u32 len, u64 raw) +{ + struct img_ir_priv_hw *hw = &priv->hw; + const struct img_ir_decoder *dec = hw->decoder; + int ret = IMG_IR_SCANCODE; + struct img_ir_scancode_req request; + + request.protocol = RC_PROTO_UNKNOWN; + request.toggle = 0; + + if (dec->scancode) + ret = dec->scancode(len, raw, hw->enabled_protocols, &request); + else if (len >= 32) + request.scancode = (u32)raw; + else if (len < 32) + request.scancode = (u32)raw & ((1 << len)-1); + dev_dbg(priv->dev, "data (%u bits) = %#llx\n", + len, (unsigned long long)raw); + if (ret == IMG_IR_SCANCODE) { + dev_dbg(priv->dev, "decoded scan code %#x, toggle %u\n", + request.scancode, request.toggle); + rc_keydown(hw->rdev, request.protocol, request.scancode, + request.toggle); + img_ir_end_repeat(priv); + } else if (ret == IMG_IR_REPEATCODE) { + if (hw->mode == IMG_IR_M_REPEATING) { + dev_dbg(priv->dev, "decoded repeat code\n"); + rc_repeat(hw->rdev); + } else { + dev_dbg(priv->dev, "decoded unexpected repeat code, ignoring\n"); + } + } else { + dev_dbg(priv->dev, "decode failed (%d)\n", ret); + return; + } + + + /* we mustn't update the end timer while trying to stop it */ + if (dec->repeat && !hw->stopping) { + unsigned long interval; + + img_ir_begin_repeat(priv); + + /* update timer, but allowing for 1/8th tolerance */ + interval = dec->repeat + (dec->repeat >> 3); + mod_timer(&hw->end_timer, + jiffies + msecs_to_jiffies(interval)); + } +} + +/* timer function to end waiting for repeat. */ +static void img_ir_end_timer(struct timer_list *t) +{ + struct img_ir_priv *priv = from_timer(priv, t, hw.end_timer); + + spin_lock_irq(&priv->lock); + img_ir_end_repeat(priv); + spin_unlock_irq(&priv->lock); +} + +/* + * Timer function to re-enable the current protocol after it had been + * cleared when invalid interrupts were generated due to a quirk in the + * img-ir decoder. + */ +static void img_ir_suspend_timer(struct timer_list *t) +{ + struct img_ir_priv *priv = from_timer(priv, t, hw.suspend_timer); + + spin_lock_irq(&priv->lock); + /* + * Don't overwrite enabled valid/match IRQs if they have already been + * changed by e.g. a filter change. + */ + if ((priv->hw.quirk_suspend_irq & IMG_IR_IRQ_EDGE) == + img_ir_read(priv, IMG_IR_IRQ_ENABLE)) + img_ir_write(priv, IMG_IR_IRQ_ENABLE, + priv->hw.quirk_suspend_irq); + /* enable */ + img_ir_write(priv, IMG_IR_CONTROL, priv->hw.reg_timings.ctrl); + spin_unlock_irq(&priv->lock); +} + +#ifdef CONFIG_COMMON_CLK +static void img_ir_change_frequency(struct img_ir_priv *priv, + struct clk_notifier_data *change) +{ + struct img_ir_priv_hw *hw = &priv->hw; + + dev_dbg(priv->dev, "clk changed %lu HZ -> %lu HZ\n", + change->old_rate, change->new_rate); + + spin_lock_irq(&priv->lock); + if (hw->clk_hz == change->new_rate) + goto unlock; + hw->clk_hz = change->new_rate; + /* refresh current timings */ + if (hw->decoder) { + img_ir_decoder_convert(hw->decoder, &hw->reg_timings, + hw->clk_hz); + switch (hw->mode) { + case IMG_IR_M_NORMAL: + img_ir_write_timings(priv, &hw->reg_timings.timings, + RC_FILTER_NORMAL); + break; + case IMG_IR_M_REPEATING: + img_ir_write_timings(priv, &hw->reg_timings.rtimings, + RC_FILTER_NORMAL); + break; +#ifdef CONFIG_PM_SLEEP + case IMG_IR_M_WAKE: + img_ir_write_timings(priv, &hw->reg_timings.timings, + RC_FILTER_WAKEUP); + break; +#endif + } + } +unlock: + spin_unlock_irq(&priv->lock); +} + +static int img_ir_clk_notify(struct notifier_block *self, unsigned long action, + void *data) +{ + struct img_ir_priv *priv = container_of(self, struct img_ir_priv, + hw.clk_nb); + switch (action) { + case POST_RATE_CHANGE: + img_ir_change_frequency(priv, data); + break; + default: + break; + } + return NOTIFY_OK; +} +#endif /* CONFIG_COMMON_CLK */ + +/* called with priv->lock held */ +void img_ir_isr_hw(struct img_ir_priv *priv, u32 irq_status) +{ + struct img_ir_priv_hw *hw = &priv->hw; + u32 ir_status, len, lw, up; + unsigned int ct; + + /* use the current decoder */ + if (!hw->decoder) + return; + + ct = hw->decoder->control.code_type; + + ir_status = img_ir_read(priv, IMG_IR_STATUS); + if (!(ir_status & (IMG_IR_RXDVAL | IMG_IR_RXDVALD2))) { + if (!(priv->hw.ct_quirks[ct] & IMG_IR_QUIRK_CODE_IRQ) || + hw->stopping) + return; + /* + * The below functionality is added as a work around to stop + * multiple Interrupts generated when an incomplete IR code is + * received by the decoder. + * The decoder generates rapid interrupts without actually + * having received any new data. After a single interrupt it's + * expected to clear up, but instead multiple interrupts are + * rapidly generated. only way to get out of this loop is to + * reset the control register after a short delay. + */ + img_ir_write(priv, IMG_IR_CONTROL, 0); + hw->quirk_suspend_irq = img_ir_read(priv, IMG_IR_IRQ_ENABLE); + img_ir_write(priv, IMG_IR_IRQ_ENABLE, + hw->quirk_suspend_irq & IMG_IR_IRQ_EDGE); + + /* Timer activated to re-enable the protocol. */ + mod_timer(&hw->suspend_timer, + jiffies + msecs_to_jiffies(5)); + return; + } + ir_status &= ~(IMG_IR_RXDVAL | IMG_IR_RXDVALD2); + img_ir_write(priv, IMG_IR_STATUS, ir_status); + + len = (ir_status & IMG_IR_RXDLEN) >> IMG_IR_RXDLEN_SHIFT; + /* some versions report wrong length for certain code types */ + if (hw->ct_quirks[ct] & IMG_IR_QUIRK_CODE_LEN_INCR) + ++len; + + lw = img_ir_read(priv, IMG_IR_DATA_LW); + up = img_ir_read(priv, IMG_IR_DATA_UP); + img_ir_handle_data(priv, len, (u64)up << 32 | lw); +} + +void img_ir_setup_hw(struct img_ir_priv *priv) +{ + struct img_ir_decoder **decp; + + if (!priv->hw.rdev) + return; + + /* Use the first available decoder (or disable stuff if NULL) */ + for (decp = img_ir_decoders; *decp; ++decp) { + const struct img_ir_decoder *dec = *decp; + if (img_ir_decoder_compatible(priv, dec)) { + img_ir_set_protocol(priv, dec->type); + img_ir_set_decoder(priv, dec, 0); + return; + } + } + img_ir_set_decoder(priv, NULL, 0); +} + +/** + * img_ir_probe_hw_caps() - Probe capabilities of the hardware. + * @priv: IR private data. + */ +static void img_ir_probe_hw_caps(struct img_ir_priv *priv) +{ + struct img_ir_priv_hw *hw = &priv->hw; + /* + * When a version of the block becomes available without these quirks, + * they'll have to depend on the core revision. + */ + hw->ct_quirks[IMG_IR_CODETYPE_PULSELEN] + |= IMG_IR_QUIRK_CODE_LEN_INCR; + hw->ct_quirks[IMG_IR_CODETYPE_BIPHASE] + |= IMG_IR_QUIRK_CODE_IRQ; + hw->ct_quirks[IMG_IR_CODETYPE_2BITPULSEPOS] + |= IMG_IR_QUIRK_CODE_BROKEN; +} + +int img_ir_probe_hw(struct img_ir_priv *priv) +{ + struct img_ir_priv_hw *hw = &priv->hw; + struct rc_dev *rdev; + int error; + + /* Ensure hardware decoders have been preprocessed */ + img_ir_init_decoders(); + + /* Probe hardware capabilities */ + img_ir_probe_hw_caps(priv); + + /* Set up the end timer */ + timer_setup(&hw->end_timer, img_ir_end_timer, 0); + timer_setup(&hw->suspend_timer, img_ir_suspend_timer, 0); + + /* Register a clock notifier */ + if (!IS_ERR(priv->clk)) { + hw->clk_hz = clk_get_rate(priv->clk); +#ifdef CONFIG_COMMON_CLK + hw->clk_nb.notifier_call = img_ir_clk_notify; + error = clk_notifier_register(priv->clk, &hw->clk_nb); + if (error) + dev_warn(priv->dev, + "failed to register clock notifier\n"); +#endif + } else { + hw->clk_hz = 32768; + } + + /* Allocate hardware decoder */ + hw->rdev = rdev = rc_allocate_device(RC_DRIVER_SCANCODE); + if (!rdev) { + dev_err(priv->dev, "cannot allocate input device\n"); + error = -ENOMEM; + goto err_alloc_rc; + } + rdev->priv = priv; + rdev->map_name = RC_MAP_EMPTY; + rdev->allowed_protocols = img_ir_allowed_protos(priv); + rdev->device_name = "IMG Infrared Decoder"; + rdev->s_filter = img_ir_set_normal_filter; + rdev->s_wakeup_filter = img_ir_set_wakeup_filter; + + /* Register hardware decoder */ + error = rc_register_device(rdev); + if (error) { + dev_err(priv->dev, "failed to register IR input device\n"); + goto err_register_rc; + } + + /* + * Set this after rc_register_device as no protocols have been + * registered yet. + */ + rdev->change_protocol = img_ir_change_protocol; + + device_init_wakeup(priv->dev, 1); + + return 0; + +err_register_rc: + img_ir_set_decoder(priv, NULL, 0); + hw->rdev = NULL; + rc_free_device(rdev); +err_alloc_rc: +#ifdef CONFIG_COMMON_CLK + if (!IS_ERR(priv->clk)) + clk_notifier_unregister(priv->clk, &hw->clk_nb); +#endif + return error; +} + +void img_ir_remove_hw(struct img_ir_priv *priv) +{ + struct img_ir_priv_hw *hw = &priv->hw; + struct rc_dev *rdev = hw->rdev; + if (!rdev) + return; + img_ir_set_decoder(priv, NULL, 0); + hw->rdev = NULL; + rc_unregister_device(rdev); +#ifdef CONFIG_COMMON_CLK + if (!IS_ERR(priv->clk)) + clk_notifier_unregister(priv->clk, &hw->clk_nb); +#endif +} + +#ifdef CONFIG_PM_SLEEP +int img_ir_suspend(struct device *dev) +{ + struct img_ir_priv *priv = dev_get_drvdata(dev); + + if (device_may_wakeup(dev) && img_ir_enable_wake(priv)) + enable_irq_wake(priv->irq); + return 0; +} + +int img_ir_resume(struct device *dev) +{ + struct img_ir_priv *priv = dev_get_drvdata(dev); + + if (device_may_wakeup(dev) && img_ir_disable_wake(priv)) + disable_irq_wake(priv->irq); + return 0; +} +#endif /* CONFIG_PM_SLEEP */ |