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- #include <linux/slab.h>
- #include <linux/time.h>
- #include <linux/math64.h>
- #include <linux/export.h>
- #include <sound/core.h>
- #include <sound/control.h>
- #include <sound/tlv.h>
- #include <sound/info.h>
- #include <sound/pcm.h>
- #include <sound/pcm_params.h>
- #include <sound/timer.h>
- #ifdef CONFIG_SND_PCM_XRUN_DEBUG
- #define CREATE_TRACE_POINTS
- #include "pcm_trace.h"
- #else
- #define trace_hwptr(substream, pos, in_interrupt)
- #define trace_xrun(substream)
- #define trace_hw_ptr_error(substream, reason)
- #endif
- void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr)
- {
- struct snd_pcm_runtime *runtime = substream->runtime;
- snd_pcm_uframes_t frames, ofs, transfer;
- if (runtime->silence_size < runtime->boundary) {
- snd_pcm_sframes_t noise_dist, n;
- if (runtime->silence_start != runtime->control->appl_ptr) {
- n = runtime->control->appl_ptr - runtime->silence_start;
- if (n < 0)
- n += runtime->boundary;
- if ((snd_pcm_uframes_t)n < runtime->silence_filled)
- runtime->silence_filled -= n;
- else
- runtime->silence_filled = 0;
- runtime->silence_start = runtime->control->appl_ptr;
- }
- if (runtime->silence_filled >= runtime->buffer_size)
- return;
- noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled;
- if (noise_dist >= (snd_pcm_sframes_t) runtime->silence_threshold)
- return;
- frames = runtime->silence_threshold - noise_dist;
- if (frames > runtime->silence_size)
- frames = runtime->silence_size;
- } else {
- if (new_hw_ptr == ULONG_MAX) {
- snd_pcm_sframes_t avail = snd_pcm_playback_hw_avail(runtime);
- if (avail > runtime->buffer_size)
- avail = runtime->buffer_size;
- runtime->silence_filled = avail > 0 ? avail : 0;
- runtime->silence_start = (runtime->status->hw_ptr +
- runtime->silence_filled) %
- runtime->boundary;
- } else {
- ofs = runtime->status->hw_ptr;
- frames = new_hw_ptr - ofs;
- if ((snd_pcm_sframes_t)frames < 0)
- frames += runtime->boundary;
- runtime->silence_filled -= frames;
- if ((snd_pcm_sframes_t)runtime->silence_filled < 0) {
- runtime->silence_filled = 0;
- runtime->silence_start = new_hw_ptr;
- } else {
- runtime->silence_start = ofs;
- }
- }
- frames = runtime->buffer_size - runtime->silence_filled;
- }
- if (snd_BUG_ON(frames > runtime->buffer_size))
- return;
- if (frames == 0)
- return;
- ofs = runtime->silence_start % runtime->buffer_size;
- while (frames > 0) {
- transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames;
- if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
- runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED) {
- if (substream->ops->silence) {
- int err;
- err = substream->ops->silence(substream, -1, ofs, transfer);
- snd_BUG_ON(err < 0);
- } else {
- char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, ofs);
- snd_pcm_format_set_silence(runtime->format, hwbuf, transfer * runtime->channels);
- }
- } else {
- unsigned int c;
- unsigned int channels = runtime->channels;
- if (substream->ops->silence) {
- for (c = 0; c < channels; ++c) {
- int err;
- err = substream->ops->silence(substream, c, ofs, transfer);
- snd_BUG_ON(err < 0);
- }
- } else {
- size_t dma_csize = runtime->dma_bytes / channels;
- for (c = 0; c < channels; ++c) {
- char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, ofs);
- snd_pcm_format_set_silence(runtime->format, hwbuf, transfer);
- }
- }
- }
- runtime->silence_filled += transfer;
- frames -= transfer;
- ofs = 0;
- }
- }
- #ifdef CONFIG_SND_DEBUG
- void snd_pcm_debug_name(struct snd_pcm_substream *substream,
- char *name, size_t len)
- {
- snprintf(name, len, "pcmC%dD%d%c:%d",
- substream->pcm->card->number,
- substream->pcm->device,
- substream->stream ? 'c' : 'p',
- substream->number);
- }
- EXPORT_SYMBOL(snd_pcm_debug_name);
- #endif
- #define XRUN_DEBUG_BASIC (1<<0)
- #define XRUN_DEBUG_STACK (1<<1) /* dump also stack */
- #define XRUN_DEBUG_JIFFIESCHECK (1<<2) /* do jiffies check */
- #ifdef CONFIG_SND_PCM_XRUN_DEBUG
- #define xrun_debug(substream, mask) \
- ((substream)->pstr->xrun_debug & (mask))
- #else
- #define xrun_debug(substream, mask) 0
- #endif
- #define dump_stack_on_xrun(substream) do { \
- if (xrun_debug(substream, XRUN_DEBUG_STACK)) \
- dump_stack(); \
- } while (0)
- static void xrun(struct snd_pcm_substream *substream)
- {
- struct snd_pcm_runtime *runtime = substream->runtime;
- trace_xrun(substream);
- if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
- snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
- snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
- if (xrun_debug(substream, XRUN_DEBUG_BASIC)) {
- char name[16];
- snd_pcm_debug_name(substream, name, sizeof(name));
- pcm_warn(substream->pcm, "XRUN: %s\n", name);
- dump_stack_on_xrun(substream);
- }
- }
- #ifdef CONFIG_SND_PCM_XRUN_DEBUG
- #define hw_ptr_error(substream, in_interrupt, reason, fmt, args...) \
- do { \
- trace_hw_ptr_error(substream, reason); \
- if (xrun_debug(substream, XRUN_DEBUG_BASIC)) { \
- pr_err_ratelimited("ALSA: PCM: [%c] " reason ": " fmt, \
- (in_interrupt) ? 'Q' : 'P', ##args); \
- dump_stack_on_xrun(substream); \
- } \
- } while (0)
- #else
- #define hw_ptr_error(substream, fmt, args...) do { } while (0)
- #endif
- int snd_pcm_update_state(struct snd_pcm_substream *substream,
- struct snd_pcm_runtime *runtime)
- {
- snd_pcm_uframes_t avail;
- if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
- avail = snd_pcm_playback_avail(runtime);
- else
- avail = snd_pcm_capture_avail(runtime);
- if (avail > runtime->avail_max)
- runtime->avail_max = avail;
- if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
- if (avail >= runtime->buffer_size) {
- snd_pcm_drain_done(substream);
- return -EPIPE;
- }
- } else {
- if (avail >= runtime->stop_threshold) {
- xrun(substream);
- return -EPIPE;
- }
- }
- if (runtime->twake) {
- if (avail >= runtime->twake)
- wake_up(&runtime->tsleep);
- } else if (avail >= runtime->control->avail_min)
- wake_up(&runtime->sleep);
- return 0;
- }
- static void update_audio_tstamp(struct snd_pcm_substream *substream,
- struct timespec *curr_tstamp,
- struct timespec *audio_tstamp)
- {
- struct snd_pcm_runtime *runtime = substream->runtime;
- u64 audio_frames, audio_nsecs;
- struct timespec driver_tstamp;
- if (runtime->tstamp_mode != SNDRV_PCM_TSTAMP_ENABLE)
- return;
- if (!(substream->ops->get_time_info) ||
- (runtime->audio_tstamp_report.actual_type ==
- SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT)) {
-
- audio_frames = runtime->hw_ptr_wrap + runtime->status->hw_ptr;
- if (runtime->audio_tstamp_config.report_delay) {
- if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
- audio_frames -= runtime->delay;
- else
- audio_frames += runtime->delay;
- }
- audio_nsecs = div_u64(audio_frames * 1000000000LL,
- runtime->rate);
- *audio_tstamp = ns_to_timespec(audio_nsecs);
- }
- runtime->status->audio_tstamp = *audio_tstamp;
- runtime->status->tstamp = *curr_tstamp;
-
- snd_pcm_gettime(substream->runtime, (struct timespec *)&driver_tstamp);
- runtime->driver_tstamp = driver_tstamp;
- }
- static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
- unsigned int in_interrupt)
- {
- struct snd_pcm_runtime *runtime = substream->runtime;
- snd_pcm_uframes_t pos;
- snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_base;
- snd_pcm_sframes_t hdelta, delta;
- unsigned long jdelta;
- unsigned long curr_jiffies;
- struct timespec curr_tstamp;
- struct timespec audio_tstamp;
- int crossed_boundary = 0;
- old_hw_ptr = runtime->status->hw_ptr;
-
- pos = substream->ops->pointer(substream);
- curr_jiffies = jiffies;
- if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
- if ((substream->ops->get_time_info) &&
- (runtime->audio_tstamp_config.type_requested != SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT)) {
- substream->ops->get_time_info(substream, &curr_tstamp,
- &audio_tstamp,
- &runtime->audio_tstamp_config,
- &runtime->audio_tstamp_report);
-
- if (runtime->audio_tstamp_report.actual_type == SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT)
- snd_pcm_gettime(runtime, (struct timespec *)&curr_tstamp);
- } else
- snd_pcm_gettime(runtime, (struct timespec *)&curr_tstamp);
- }
- if (pos == SNDRV_PCM_POS_XRUN) {
- xrun(substream);
- return -EPIPE;
- }
- if (pos >= runtime->buffer_size) {
- if (printk_ratelimit()) {
- char name[16];
- snd_pcm_debug_name(substream, name, sizeof(name));
- pcm_err(substream->pcm,
- "BUG: %s, pos = %ld, buffer size = %ld, period size = %ld\n",
- name, pos, runtime->buffer_size,
- runtime->period_size);
- }
- pos = 0;
- }
- pos -= pos % runtime->min_align;
- trace_hwptr(substream, pos, in_interrupt);
- hw_base = runtime->hw_ptr_base;
- new_hw_ptr = hw_base + pos;
- if (in_interrupt) {
-
-
- delta = runtime->hw_ptr_interrupt + runtime->period_size;
- if (delta > new_hw_ptr) {
-
- hdelta = curr_jiffies - runtime->hw_ptr_jiffies;
- if (hdelta > runtime->hw_ptr_buffer_jiffies/2 + 1) {
- hw_base += runtime->buffer_size;
- if (hw_base >= runtime->boundary) {
- hw_base = 0;
- crossed_boundary++;
- }
- new_hw_ptr = hw_base + pos;
- goto __delta;
- }
- }
- }
-
-
- if (new_hw_ptr < old_hw_ptr) {
- hw_base += runtime->buffer_size;
- if (hw_base >= runtime->boundary) {
- hw_base = 0;
- crossed_boundary++;
- }
- new_hw_ptr = hw_base + pos;
- }
- __delta:
- delta = new_hw_ptr - old_hw_ptr;
- if (delta < 0)
- delta += runtime->boundary;
- if (runtime->no_period_wakeup) {
- snd_pcm_sframes_t xrun_threshold;
-
- jdelta = curr_jiffies - runtime->hw_ptr_jiffies;
- if (jdelta < runtime->hw_ptr_buffer_jiffies / 2)
- goto no_delta_check;
- hdelta = jdelta - delta * HZ / runtime->rate;
- xrun_threshold = runtime->hw_ptr_buffer_jiffies / 2 + 1;
- while (hdelta > xrun_threshold) {
- delta += runtime->buffer_size;
- hw_base += runtime->buffer_size;
- if (hw_base >= runtime->boundary) {
- hw_base = 0;
- crossed_boundary++;
- }
- new_hw_ptr = hw_base + pos;
- hdelta -= runtime->hw_ptr_buffer_jiffies;
- }
- goto no_delta_check;
- }
-
- if (delta >= runtime->buffer_size + runtime->period_size) {
- hw_ptr_error(substream, in_interrupt, "Unexpected hw_ptr",
- "(stream=%i, pos=%ld, new_hw_ptr=%ld, old_hw_ptr=%ld)\n",
- substream->stream, (long)pos,
- (long)new_hw_ptr, (long)old_hw_ptr);
- return 0;
- }
-
- if (!xrun_debug(substream, XRUN_DEBUG_JIFFIESCHECK))
- goto no_jiffies_check;
-
- if (runtime->hw.info & SNDRV_PCM_INFO_BATCH)
- goto no_jiffies_check;
- hdelta = delta;
- if (hdelta < runtime->delay)
- goto no_jiffies_check;
- hdelta -= runtime->delay;
- jdelta = curr_jiffies - runtime->hw_ptr_jiffies;
- if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) {
- delta = jdelta /
- (((runtime->period_size * HZ) / runtime->rate)
- + HZ/100);
-
- new_hw_ptr = old_hw_ptr;
- hw_base = delta;
-
-
- while (delta > 0) {
- new_hw_ptr += runtime->period_size;
- if (new_hw_ptr >= runtime->boundary) {
- new_hw_ptr -= runtime->boundary;
- crossed_boundary--;
- }
- delta--;
- }
-
- hw_ptr_error(substream, in_interrupt, "hw_ptr skipping",
- "(pos=%ld, delta=%ld, period=%ld, jdelta=%lu/%lu/%lu, hw_ptr=%ld/%ld)\n",
- (long)pos, (long)hdelta,
- (long)runtime->period_size, jdelta,
- ((hdelta * HZ) / runtime->rate), hw_base,
- (unsigned long)old_hw_ptr,
- (unsigned long)new_hw_ptr);
-
- delta = 0;
- hw_base = new_hw_ptr - (new_hw_ptr % runtime->buffer_size);
- }
- no_jiffies_check:
- if (delta > runtime->period_size + runtime->period_size / 2) {
- hw_ptr_error(substream, in_interrupt,
- "Lost interrupts?",
- "(stream=%i, delta=%ld, new_hw_ptr=%ld, old_hw_ptr=%ld)\n",
- substream->stream, (long)delta,
- (long)new_hw_ptr,
- (long)old_hw_ptr);
- }
- no_delta_check:
- if (runtime->status->hw_ptr == new_hw_ptr) {
- update_audio_tstamp(substream, &curr_tstamp, &audio_tstamp);
- return 0;
- }
- if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
- runtime->silence_size > 0)
- snd_pcm_playback_silence(substream, new_hw_ptr);
- if (in_interrupt) {
- delta = new_hw_ptr - runtime->hw_ptr_interrupt;
- if (delta < 0)
- delta += runtime->boundary;
- delta -= (snd_pcm_uframes_t)delta % runtime->period_size;
- runtime->hw_ptr_interrupt += delta;
- if (runtime->hw_ptr_interrupt >= runtime->boundary)
- runtime->hw_ptr_interrupt -= runtime->boundary;
- }
- runtime->hw_ptr_base = hw_base;
- runtime->status->hw_ptr = new_hw_ptr;
- runtime->hw_ptr_jiffies = curr_jiffies;
- if (crossed_boundary) {
- snd_BUG_ON(crossed_boundary != 1);
- runtime->hw_ptr_wrap += runtime->boundary;
- }
- update_audio_tstamp(substream, &curr_tstamp, &audio_tstamp);
- return snd_pcm_update_state(substream, runtime);
- }
- int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
- {
- return snd_pcm_update_hw_ptr0(substream, 0);
- }
- void snd_pcm_set_ops(struct snd_pcm *pcm, int direction,
- const struct snd_pcm_ops *ops)
- {
- struct snd_pcm_str *stream = &pcm->streams[direction];
- struct snd_pcm_substream *substream;
-
- for (substream = stream->substream; substream != NULL; substream = substream->next)
- substream->ops = ops;
- }
- EXPORT_SYMBOL(snd_pcm_set_ops);
- void snd_pcm_set_sync(struct snd_pcm_substream *substream)
- {
- struct snd_pcm_runtime *runtime = substream->runtime;
-
- runtime->sync.id32[0] = substream->pcm->card->number;
- runtime->sync.id32[1] = -1;
- runtime->sync.id32[2] = -1;
- runtime->sync.id32[3] = -1;
- }
- EXPORT_SYMBOL(snd_pcm_set_sync);
- static inline unsigned int div32(unsigned int a, unsigned int b,
- unsigned int *r)
- {
- if (b == 0) {
- *r = 0;
- return UINT_MAX;
- }
- *r = a % b;
- return a / b;
- }
- static inline unsigned int div_down(unsigned int a, unsigned int b)
- {
- if (b == 0)
- return UINT_MAX;
- return a / b;
- }
- static inline unsigned int div_up(unsigned int a, unsigned int b)
- {
- unsigned int r;
- unsigned int q;
- if (b == 0)
- return UINT_MAX;
- q = div32(a, b, &r);
- if (r)
- ++q;
- return q;
- }
- static inline unsigned int mul(unsigned int a, unsigned int b)
- {
- if (a == 0)
- return 0;
- if (div_down(UINT_MAX, a) < b)
- return UINT_MAX;
- return a * b;
- }
- static inline unsigned int muldiv32(unsigned int a, unsigned int b,
- unsigned int c, unsigned int *r)
- {
- u_int64_t n = (u_int64_t) a * b;
- if (c == 0) {
- snd_BUG_ON(!n);
- *r = 0;
- return UINT_MAX;
- }
- n = div_u64_rem(n, c, r);
- if (n >= UINT_MAX) {
- *r = 0;
- return UINT_MAX;
- }
- return n;
- }
- int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v)
- {
- int changed = 0;
- if (snd_BUG_ON(snd_interval_empty(i)))
- return -EINVAL;
- if (i->min < v->min) {
- i->min = v->min;
- i->openmin = v->openmin;
- changed = 1;
- } else if (i->min == v->min && !i->openmin && v->openmin) {
- i->openmin = 1;
- changed = 1;
- }
- if (i->max > v->max) {
- i->max = v->max;
- i->openmax = v->openmax;
- changed = 1;
- } else if (i->max == v->max && !i->openmax && v->openmax) {
- i->openmax = 1;
- changed = 1;
- }
- if (!i->integer && v->integer) {
- i->integer = 1;
- changed = 1;
- }
- if (i->integer) {
- if (i->openmin) {
- i->min++;
- i->openmin = 0;
- }
- if (i->openmax) {
- i->max--;
- i->openmax = 0;
- }
- } else if (!i->openmin && !i->openmax && i->min == i->max)
- i->integer = 1;
- if (snd_interval_checkempty(i)) {
- snd_interval_none(i);
- return -EINVAL;
- }
- return changed;
- }
- EXPORT_SYMBOL(snd_interval_refine);
- static int snd_interval_refine_first(struct snd_interval *i)
- {
- if (snd_BUG_ON(snd_interval_empty(i)))
- return -EINVAL;
- if (snd_interval_single(i))
- return 0;
- i->max = i->min;
- i->openmax = i->openmin;
- if (i->openmax)
- i->max++;
- return 1;
- }
- static int snd_interval_refine_last(struct snd_interval *i)
- {
- if (snd_BUG_ON(snd_interval_empty(i)))
- return -EINVAL;
- if (snd_interval_single(i))
- return 0;
- i->min = i->max;
- i->openmin = i->openmax;
- if (i->openmin)
- i->min--;
- return 1;
- }
- void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
- {
- if (a->empty || b->empty) {
- snd_interval_none(c);
- return;
- }
- c->empty = 0;
- c->min = mul(a->min, b->min);
- c->openmin = (a->openmin || b->openmin);
- c->max = mul(a->max, b->max);
- c->openmax = (a->openmax || b->openmax);
- c->integer = (a->integer && b->integer);
- }
- void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
- {
- unsigned int r;
- if (a->empty || b->empty) {
- snd_interval_none(c);
- return;
- }
- c->empty = 0;
- c->min = div32(a->min, b->max, &r);
- c->openmin = (r || a->openmin || b->openmax);
- if (b->min > 0) {
- c->max = div32(a->max, b->min, &r);
- if (r) {
- c->max++;
- c->openmax = 1;
- } else
- c->openmax = (a->openmax || b->openmin);
- } else {
- c->max = UINT_MAX;
- c->openmax = 0;
- }
- c->integer = 0;
- }
- void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
- unsigned int k, struct snd_interval *c)
- {
- unsigned int r;
- if (a->empty || b->empty) {
- snd_interval_none(c);
- return;
- }
- c->empty = 0;
- c->min = muldiv32(a->min, b->min, k, &r);
- c->openmin = (r || a->openmin || b->openmin);
- c->max = muldiv32(a->max, b->max, k, &r);
- if (r) {
- c->max++;
- c->openmax = 1;
- } else
- c->openmax = (a->openmax || b->openmax);
- c->integer = 0;
- }
- void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
- const struct snd_interval *b, struct snd_interval *c)
- {
- unsigned int r;
- if (a->empty || b->empty) {
- snd_interval_none(c);
- return;
- }
- c->empty = 0;
- c->min = muldiv32(a->min, k, b->max, &r);
- c->openmin = (r || a->openmin || b->openmax);
- if (b->min > 0) {
- c->max = muldiv32(a->max, k, b->min, &r);
- if (r) {
- c->max++;
- c->openmax = 1;
- } else
- c->openmax = (a->openmax || b->openmin);
- } else {
- c->max = UINT_MAX;
- c->openmax = 0;
- }
- c->integer = 0;
- }
- int snd_interval_ratnum(struct snd_interval *i,
- unsigned int rats_count, struct snd_ratnum *rats,
- unsigned int *nump, unsigned int *denp)
- {
- unsigned int best_num, best_den;
- int best_diff;
- unsigned int k;
- struct snd_interval t;
- int err;
- unsigned int result_num, result_den;
- int result_diff;
- best_num = best_den = best_diff = 0;
- for (k = 0; k < rats_count; ++k) {
- unsigned int num = rats[k].num;
- unsigned int den;
- unsigned int q = i->min;
- int diff;
- if (q == 0)
- q = 1;
- den = div_up(num, q);
- if (den < rats[k].den_min)
- continue;
- if (den > rats[k].den_max)
- den = rats[k].den_max;
- else {
- unsigned int r;
- r = (den - rats[k].den_min) % rats[k].den_step;
- if (r != 0)
- den -= r;
- }
- diff = num - q * den;
- if (diff < 0)
- diff = -diff;
- if (best_num == 0 ||
- diff * best_den < best_diff * den) {
- best_diff = diff;
- best_den = den;
- best_num = num;
- }
- }
- if (best_den == 0) {
- i->empty = 1;
- return -EINVAL;
- }
- t.min = div_down(best_num, best_den);
- t.openmin = !!(best_num % best_den);
-
- result_num = best_num;
- result_diff = best_diff;
- result_den = best_den;
- best_num = best_den = best_diff = 0;
- for (k = 0; k < rats_count; ++k) {
- unsigned int num = rats[k].num;
- unsigned int den;
- unsigned int q = i->max;
- int diff;
- if (q == 0) {
- i->empty = 1;
- return -EINVAL;
- }
- den = div_down(num, q);
- if (den > rats[k].den_max)
- continue;
- if (den < rats[k].den_min)
- den = rats[k].den_min;
- else {
- unsigned int r;
- r = (den - rats[k].den_min) % rats[k].den_step;
- if (r != 0)
- den += rats[k].den_step - r;
- }
- diff = q * den - num;
- if (diff < 0)
- diff = -diff;
- if (best_num == 0 ||
- diff * best_den < best_diff * den) {
- best_diff = diff;
- best_den = den;
- best_num = num;
- }
- }
- if (best_den == 0) {
- i->empty = 1;
- return -EINVAL;
- }
- t.max = div_up(best_num, best_den);
- t.openmax = !!(best_num % best_den);
- t.integer = 0;
- err = snd_interval_refine(i, &t);
- if (err < 0)
- return err;
- if (snd_interval_single(i)) {
- if (best_diff * result_den < result_diff * best_den) {
- result_num = best_num;
- result_den = best_den;
- }
- if (nump)
- *nump = result_num;
- if (denp)
- *denp = result_den;
- }
- return err;
- }
- EXPORT_SYMBOL(snd_interval_ratnum);
- static int snd_interval_ratden(struct snd_interval *i,
- unsigned int rats_count, struct snd_ratden *rats,
- unsigned int *nump, unsigned int *denp)
- {
- unsigned int best_num, best_diff, best_den;
- unsigned int k;
- struct snd_interval t;
- int err;
- best_num = best_den = best_diff = 0;
- for (k = 0; k < rats_count; ++k) {
- unsigned int num;
- unsigned int den = rats[k].den;
- unsigned int q = i->min;
- int diff;
- num = mul(q, den);
- if (num > rats[k].num_max)
- continue;
- if (num < rats[k].num_min)
- num = rats[k].num_max;
- else {
- unsigned int r;
- r = (num - rats[k].num_min) % rats[k].num_step;
- if (r != 0)
- num += rats[k].num_step - r;
- }
- diff = num - q * den;
- if (best_num == 0 ||
- diff * best_den < best_diff * den) {
- best_diff = diff;
- best_den = den;
- best_num = num;
- }
- }
- if (best_den == 0) {
- i->empty = 1;
- return -EINVAL;
- }
- t.min = div_down(best_num, best_den);
- t.openmin = !!(best_num % best_den);
-
- best_num = best_den = best_diff = 0;
- for (k = 0; k < rats_count; ++k) {
- unsigned int num;
- unsigned int den = rats[k].den;
- unsigned int q = i->max;
- int diff;
- num = mul(q, den);
- if (num < rats[k].num_min)
- continue;
- if (num > rats[k].num_max)
- num = rats[k].num_max;
- else {
- unsigned int r;
- r = (num - rats[k].num_min) % rats[k].num_step;
- if (r != 0)
- num -= r;
- }
- diff = q * den - num;
- if (best_num == 0 ||
- diff * best_den < best_diff * den) {
- best_diff = diff;
- best_den = den;
- best_num = num;
- }
- }
- if (best_den == 0) {
- i->empty = 1;
- return -EINVAL;
- }
- t.max = div_up(best_num, best_den);
- t.openmax = !!(best_num % best_den);
- t.integer = 0;
- err = snd_interval_refine(i, &t);
- if (err < 0)
- return err;
- if (snd_interval_single(i)) {
- if (nump)
- *nump = best_num;
- if (denp)
- *denp = best_den;
- }
- return err;
- }
- int snd_interval_list(struct snd_interval *i, unsigned int count,
- const unsigned int *list, unsigned int mask)
- {
- unsigned int k;
- struct snd_interval list_range;
- if (!count) {
- i->empty = 1;
- return -EINVAL;
- }
- snd_interval_any(&list_range);
- list_range.min = UINT_MAX;
- list_range.max = 0;
- for (k = 0; k < count; k++) {
- if (mask && !(mask & (1 << k)))
- continue;
- if (!snd_interval_test(i, list[k]))
- continue;
- list_range.min = min(list_range.min, list[k]);
- list_range.max = max(list_range.max, list[k]);
- }
- return snd_interval_refine(i, &list_range);
- }
- EXPORT_SYMBOL(snd_interval_list);
- int snd_interval_ranges(struct snd_interval *i, unsigned int count,
- const struct snd_interval *ranges, unsigned int mask)
- {
- unsigned int k;
- struct snd_interval range_union;
- struct snd_interval range;
- if (!count) {
- snd_interval_none(i);
- return -EINVAL;
- }
- snd_interval_any(&range_union);
- range_union.min = UINT_MAX;
- range_union.max = 0;
- for (k = 0; k < count; k++) {
- if (mask && !(mask & (1 << k)))
- continue;
- snd_interval_copy(&range, &ranges[k]);
- if (snd_interval_refine(&range, i) < 0)
- continue;
- if (snd_interval_empty(&range))
- continue;
- if (range.min < range_union.min) {
- range_union.min = range.min;
- range_union.openmin = 1;
- }
- if (range.min == range_union.min && !range.openmin)
- range_union.openmin = 0;
- if (range.max > range_union.max) {
- range_union.max = range.max;
- range_union.openmax = 1;
- }
- if (range.max == range_union.max && !range.openmax)
- range_union.openmax = 0;
- }
- return snd_interval_refine(i, &range_union);
- }
- EXPORT_SYMBOL(snd_interval_ranges);
- static int snd_interval_step(struct snd_interval *i, unsigned int step)
- {
- unsigned int n;
- int changed = 0;
- n = i->min % step;
- if (n != 0 || i->openmin) {
- i->min += step - n;
- i->openmin = 0;
- changed = 1;
- }
- n = i->max % step;
- if (n != 0 || i->openmax) {
- i->max -= n;
- i->openmax = 0;
- changed = 1;
- }
- if (snd_interval_checkempty(i)) {
- i->empty = 1;
- return -EINVAL;
- }
- return changed;
- }
- int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond,
- int var,
- snd_pcm_hw_rule_func_t func, void *private,
- int dep, ...)
- {
- struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
- struct snd_pcm_hw_rule *c;
- unsigned int k;
- va_list args;
- va_start(args, dep);
- if (constrs->rules_num >= constrs->rules_all) {
- struct snd_pcm_hw_rule *new;
- unsigned int new_rules = constrs->rules_all + 16;
- new = kcalloc(new_rules, sizeof(*c), GFP_KERNEL);
- if (!new) {
- va_end(args);
- return -ENOMEM;
- }
- if (constrs->rules) {
- memcpy(new, constrs->rules,
- constrs->rules_num * sizeof(*c));
- kfree(constrs->rules);
- }
- constrs->rules = new;
- constrs->rules_all = new_rules;
- }
- c = &constrs->rules[constrs->rules_num];
- c->cond = cond;
- c->func = func;
- c->var = var;
- c->private = private;
- k = 0;
- while (1) {
- if (snd_BUG_ON(k >= ARRAY_SIZE(c->deps))) {
- va_end(args);
- return -EINVAL;
- }
- c->deps[k++] = dep;
- if (dep < 0)
- break;
- dep = va_arg(args, int);
- }
- constrs->rules_num++;
- va_end(args);
- return 0;
- }
- EXPORT_SYMBOL(snd_pcm_hw_rule_add);
- int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
- u_int32_t mask)
- {
- struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
- struct snd_mask *maskp = constrs_mask(constrs, var);
- *maskp->bits &= mask;
- memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8);
- if (*maskp->bits == 0)
- return -EINVAL;
- return 0;
- }
- int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
- u_int64_t mask)
- {
- struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
- struct snd_mask *maskp = constrs_mask(constrs, var);
- maskp->bits[0] &= (u_int32_t)mask;
- maskp->bits[1] &= (u_int32_t)(mask >> 32);
- memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8);
- if (! maskp->bits[0] && ! maskp->bits[1])
- return -EINVAL;
- return 0;
- }
- EXPORT_SYMBOL(snd_pcm_hw_constraint_mask64);
- int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var)
- {
- struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
- return snd_interval_setinteger(constrs_interval(constrs, var));
- }
- EXPORT_SYMBOL(snd_pcm_hw_constraint_integer);
- int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
- unsigned int min, unsigned int max)
- {
- struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
- struct snd_interval t;
- t.min = min;
- t.max = max;
- t.openmin = t.openmax = 0;
- t.integer = 0;
- return snd_interval_refine(constrs_interval(constrs, var), &t);
- }
- EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax);
- static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params *params,
- struct snd_pcm_hw_rule *rule)
- {
- struct snd_pcm_hw_constraint_list *list = rule->private;
- return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask);
- }
- int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
- unsigned int cond,
- snd_pcm_hw_param_t var,
- const struct snd_pcm_hw_constraint_list *l)
- {
- return snd_pcm_hw_rule_add(runtime, cond, var,
- snd_pcm_hw_rule_list, (void *)l,
- var, -1);
- }
- EXPORT_SYMBOL(snd_pcm_hw_constraint_list);
- static int snd_pcm_hw_rule_ranges(struct snd_pcm_hw_params *params,
- struct snd_pcm_hw_rule *rule)
- {
- struct snd_pcm_hw_constraint_ranges *r = rule->private;
- return snd_interval_ranges(hw_param_interval(params, rule->var),
- r->count, r->ranges, r->mask);
- }
- int snd_pcm_hw_constraint_ranges(struct snd_pcm_runtime *runtime,
- unsigned int cond,
- snd_pcm_hw_param_t var,
- const struct snd_pcm_hw_constraint_ranges *r)
- {
- return snd_pcm_hw_rule_add(runtime, cond, var,
- snd_pcm_hw_rule_ranges, (void *)r,
- var, -1);
- }
- EXPORT_SYMBOL(snd_pcm_hw_constraint_ranges);
- static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params *params,
- struct snd_pcm_hw_rule *rule)
- {
- struct snd_pcm_hw_constraint_ratnums *r = rule->private;
- unsigned int num = 0, den = 0;
- int err;
- err = snd_interval_ratnum(hw_param_interval(params, rule->var),
- r->nrats, r->rats, &num, &den);
- if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
- params->rate_num = num;
- params->rate_den = den;
- }
- return err;
- }
- int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
- unsigned int cond,
- snd_pcm_hw_param_t var,
- struct snd_pcm_hw_constraint_ratnums *r)
- {
- return snd_pcm_hw_rule_add(runtime, cond, var,
- snd_pcm_hw_rule_ratnums, r,
- var, -1);
- }
- EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums);
- static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params *params,
- struct snd_pcm_hw_rule *rule)
- {
- struct snd_pcm_hw_constraint_ratdens *r = rule->private;
- unsigned int num = 0, den = 0;
- int err = snd_interval_ratden(hw_param_interval(params, rule->var),
- r->nrats, r->rats, &num, &den);
- if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
- params->rate_num = num;
- params->rate_den = den;
- }
- return err;
- }
- int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
- unsigned int cond,
- snd_pcm_hw_param_t var,
- struct snd_pcm_hw_constraint_ratdens *r)
- {
- return snd_pcm_hw_rule_add(runtime, cond, var,
- snd_pcm_hw_rule_ratdens, r,
- var, -1);
- }
- EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens);
- static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params,
- struct snd_pcm_hw_rule *rule)
- {
- unsigned int l = (unsigned long) rule->private;
- int width = l & 0xffff;
- unsigned int msbits = l >> 16;
- struct snd_interval *i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
- if (!snd_interval_single(i))
- return 0;
- if ((snd_interval_value(i) == width) ||
- (width == 0 && snd_interval_value(i) > msbits))
- params->msbits = min_not_zero(params->msbits, msbits);
- return 0;
- }
- int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
- unsigned int cond,
- unsigned int width,
- unsigned int msbits)
- {
- unsigned long l = (msbits << 16) | width;
- return snd_pcm_hw_rule_add(runtime, cond, -1,
- snd_pcm_hw_rule_msbits,
- (void*) l,
- SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
- }
- EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits);
- static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params *params,
- struct snd_pcm_hw_rule *rule)
- {
- unsigned long step = (unsigned long) rule->private;
- return snd_interval_step(hw_param_interval(params, rule->var), step);
- }
- int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
- unsigned int cond,
- snd_pcm_hw_param_t var,
- unsigned long step)
- {
- return snd_pcm_hw_rule_add(runtime, cond, var,
- snd_pcm_hw_rule_step, (void *) step,
- var, -1);
- }
- EXPORT_SYMBOL(snd_pcm_hw_constraint_step);
- static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
- {
- static unsigned int pow2_sizes[] = {
- 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
- 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
- 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
- 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
- };
- return snd_interval_list(hw_param_interval(params, rule->var),
- ARRAY_SIZE(pow2_sizes), pow2_sizes, 0);
- }
- int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
- unsigned int cond,
- snd_pcm_hw_param_t var)
- {
- return snd_pcm_hw_rule_add(runtime, cond, var,
- snd_pcm_hw_rule_pow2, NULL,
- var, -1);
- }
- EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2);
- static int snd_pcm_hw_rule_noresample_func(struct snd_pcm_hw_params *params,
- struct snd_pcm_hw_rule *rule)
- {
- unsigned int base_rate = (unsigned int)(uintptr_t)rule->private;
- struct snd_interval *rate;
- rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
- return snd_interval_list(rate, 1, &base_rate, 0);
- }
- int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime,
- unsigned int base_rate)
- {
- return snd_pcm_hw_rule_add(runtime, SNDRV_PCM_HW_PARAMS_NORESAMPLE,
- SNDRV_PCM_HW_PARAM_RATE,
- snd_pcm_hw_rule_noresample_func,
- (void *)(uintptr_t)base_rate,
- SNDRV_PCM_HW_PARAM_RATE, -1);
- }
- EXPORT_SYMBOL(snd_pcm_hw_rule_noresample);
- static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params *params,
- snd_pcm_hw_param_t var)
- {
- if (hw_is_mask(var)) {
- snd_mask_any(hw_param_mask(params, var));
- params->cmask |= 1 << var;
- params->rmask |= 1 << var;
- return;
- }
- if (hw_is_interval(var)) {
- snd_interval_any(hw_param_interval(params, var));
- params->cmask |= 1 << var;
- params->rmask |= 1 << var;
- return;
- }
- snd_BUG();
- }
- void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params)
- {
- unsigned int k;
- memset(params, 0, sizeof(*params));
- for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++)
- _snd_pcm_hw_param_any(params, k);
- for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
- _snd_pcm_hw_param_any(params, k);
- params->info = ~0U;
- }
- EXPORT_SYMBOL(_snd_pcm_hw_params_any);
- int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
- snd_pcm_hw_param_t var, int *dir)
- {
- if (hw_is_mask(var)) {
- const struct snd_mask *mask = hw_param_mask_c(params, var);
- if (!snd_mask_single(mask))
- return -EINVAL;
- if (dir)
- *dir = 0;
- return snd_mask_value(mask);
- }
- if (hw_is_interval(var)) {
- const struct snd_interval *i = hw_param_interval_c(params, var);
- if (!snd_interval_single(i))
- return -EINVAL;
- if (dir)
- *dir = i->openmin;
- return snd_interval_value(i);
- }
- return -EINVAL;
- }
- EXPORT_SYMBOL(snd_pcm_hw_param_value);
- void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params,
- snd_pcm_hw_param_t var)
- {
- if (hw_is_mask(var)) {
- snd_mask_none(hw_param_mask(params, var));
- params->cmask |= 1 << var;
- params->rmask |= 1 << var;
- } else if (hw_is_interval(var)) {
- snd_interval_none(hw_param_interval(params, var));
- params->cmask |= 1 << var;
- params->rmask |= 1 << var;
- } else {
- snd_BUG();
- }
- }
- EXPORT_SYMBOL(_snd_pcm_hw_param_setempty);
- static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params *params,
- snd_pcm_hw_param_t var)
- {
- int changed;
- if (hw_is_mask(var))
- changed = snd_mask_refine_first(hw_param_mask(params, var));
- else if (hw_is_interval(var))
- changed = snd_interval_refine_first(hw_param_interval(params, var));
- else
- return -EINVAL;
- if (changed) {
- params->cmask |= 1 << var;
- params->rmask |= 1 << var;
- }
- return changed;
- }
- int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm,
- struct snd_pcm_hw_params *params,
- snd_pcm_hw_param_t var, int *dir)
- {
- int changed = _snd_pcm_hw_param_first(params, var);
- if (changed < 0)
- return changed;
- if (params->rmask) {
- int err = snd_pcm_hw_refine(pcm, params);
- if (snd_BUG_ON(err < 0))
- return err;
- }
- return snd_pcm_hw_param_value(params, var, dir);
- }
- EXPORT_SYMBOL(snd_pcm_hw_param_first);
- static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params *params,
- snd_pcm_hw_param_t var)
- {
- int changed;
- if (hw_is_mask(var))
- changed = snd_mask_refine_last(hw_param_mask(params, var));
- else if (hw_is_interval(var))
- changed = snd_interval_refine_last(hw_param_interval(params, var));
- else
- return -EINVAL;
- if (changed) {
- params->cmask |= 1 << var;
- params->rmask |= 1 << var;
- }
- return changed;
- }
- int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm,
- struct snd_pcm_hw_params *params,
- snd_pcm_hw_param_t var, int *dir)
- {
- int changed = _snd_pcm_hw_param_last(params, var);
- if (changed < 0)
- return changed;
- if (params->rmask) {
- int err = snd_pcm_hw_refine(pcm, params);
- if (snd_BUG_ON(err < 0))
- return err;
- }
- return snd_pcm_hw_param_value(params, var, dir);
- }
- EXPORT_SYMBOL(snd_pcm_hw_param_last);
- int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
- struct snd_pcm_hw_params *params)
- {
- static int vars[] = {
- SNDRV_PCM_HW_PARAM_ACCESS,
- SNDRV_PCM_HW_PARAM_FORMAT,
- SNDRV_PCM_HW_PARAM_SUBFORMAT,
- SNDRV_PCM_HW_PARAM_CHANNELS,
- SNDRV_PCM_HW_PARAM_RATE,
- SNDRV_PCM_HW_PARAM_PERIOD_TIME,
- SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
- SNDRV_PCM_HW_PARAM_TICK_TIME,
- -1
- };
- int err, *v;
- for (v = vars; *v != -1; v++) {
- if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
- err = snd_pcm_hw_param_first(pcm, params, *v, NULL);
- else
- err = snd_pcm_hw_param_last(pcm, params, *v, NULL);
- if (snd_BUG_ON(err < 0))
- return err;
- }
- return 0;
- }
- static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream,
- void *arg)
- {
- struct snd_pcm_runtime *runtime = substream->runtime;
- unsigned long flags;
- snd_pcm_stream_lock_irqsave(substream, flags);
- if (snd_pcm_running(substream) &&
- snd_pcm_update_hw_ptr(substream) >= 0)
- runtime->status->hw_ptr %= runtime->buffer_size;
- else {
- runtime->status->hw_ptr = 0;
- runtime->hw_ptr_wrap = 0;
- }
- snd_pcm_stream_unlock_irqrestore(substream, flags);
- return 0;
- }
- static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream *substream,
- void *arg)
- {
- struct snd_pcm_channel_info *info = arg;
- struct snd_pcm_runtime *runtime = substream->runtime;
- int width;
- if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) {
- info->offset = -1;
- return 0;
- }
- width = snd_pcm_format_physical_width(runtime->format);
- if (width < 0)
- return width;
- info->offset = 0;
- switch (runtime->access) {
- case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED:
- case SNDRV_PCM_ACCESS_RW_INTERLEAVED:
- info->first = info->channel * width;
- info->step = runtime->channels * width;
- break;
- case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED:
- case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED:
- {
- size_t size = runtime->dma_bytes / runtime->channels;
- info->first = info->channel * size * 8;
- info->step = width;
- break;
- }
- default:
- snd_BUG();
- break;
- }
- return 0;
- }
- static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream *substream,
- void *arg)
- {
- struct snd_pcm_hw_params *params = arg;
- snd_pcm_format_t format;
- int channels;
- ssize_t frame_size;
- params->fifo_size = substream->runtime->hw.fifo_size;
- if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_FIFO_IN_FRAMES)) {
- format = params_format(params);
- channels = params_channels(params);
- frame_size = snd_pcm_format_size(format, channels);
- if (frame_size > 0)
- params->fifo_size /= (unsigned)frame_size;
- }
- return 0;
- }
- int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
- unsigned int cmd, void *arg)
- {
- switch (cmd) {
- case SNDRV_PCM_IOCTL1_INFO:
- return 0;
- case SNDRV_PCM_IOCTL1_RESET:
- return snd_pcm_lib_ioctl_reset(substream, arg);
- case SNDRV_PCM_IOCTL1_CHANNEL_INFO:
- return snd_pcm_lib_ioctl_channel_info(substream, arg);
- case SNDRV_PCM_IOCTL1_FIFO_SIZE:
- return snd_pcm_lib_ioctl_fifo_size(substream, arg);
- }
- return -ENXIO;
- }
- EXPORT_SYMBOL(snd_pcm_lib_ioctl);
- void snd_pcm_period_elapsed(struct snd_pcm_substream *substream)
- {
- struct snd_pcm_runtime *runtime;
- unsigned long flags;
- if (PCM_RUNTIME_CHECK(substream))
- return;
- runtime = substream->runtime;
- if (runtime->transfer_ack_begin)
- runtime->transfer_ack_begin(substream);
- snd_pcm_stream_lock_irqsave(substream, flags);
- if (!snd_pcm_running(substream) ||
- snd_pcm_update_hw_ptr0(substream, 1) < 0)
- goto _end;
- if (substream->timer_running)
- snd_timer_interrupt(substream->timer, 1);
- _end:
- snd_pcm_stream_unlock_irqrestore(substream, flags);
- if (runtime->transfer_ack_end)
- runtime->transfer_ack_end(substream);
- kill_fasync(&runtime->fasync, SIGIO, POLL_IN);
- }
- EXPORT_SYMBOL(snd_pcm_period_elapsed);
- static int wait_for_avail(struct snd_pcm_substream *substream,
- snd_pcm_uframes_t *availp)
- {
- struct snd_pcm_runtime *runtime = substream->runtime;
- int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
- wait_queue_t wait;
- int err = 0;
- snd_pcm_uframes_t avail = 0;
- long wait_time, tout;
- init_waitqueue_entry(&wait, current);
- set_current_state(TASK_INTERRUPTIBLE);
- add_wait_queue(&runtime->tsleep, &wait);
- if (runtime->no_period_wakeup)
- wait_time = MAX_SCHEDULE_TIMEOUT;
- else {
- wait_time = 10;
- if (runtime->rate) {
- long t = runtime->period_size * 2 / runtime->rate;
- wait_time = max(t, wait_time);
- }
- wait_time = msecs_to_jiffies(wait_time * 1000);
- }
- for (;;) {
- if (signal_pending(current)) {
- err = -ERESTARTSYS;
- break;
- }
-
- if (is_playback)
- avail = snd_pcm_playback_avail(runtime);
- else
- avail = snd_pcm_capture_avail(runtime);
- if (avail >= runtime->twake)
- break;
- snd_pcm_stream_unlock_irq(substream);
- tout = schedule_timeout(wait_time);
- snd_pcm_stream_lock_irq(substream);
- set_current_state(TASK_INTERRUPTIBLE);
- switch (runtime->status->state) {
- case SNDRV_PCM_STATE_SUSPENDED:
- err = -ESTRPIPE;
- goto _endloop;
- case SNDRV_PCM_STATE_XRUN:
- err = -EPIPE;
- goto _endloop;
- case SNDRV_PCM_STATE_DRAINING:
- if (is_playback)
- err = -EPIPE;
- else
- avail = 0;
- goto _endloop;
- case SNDRV_PCM_STATE_OPEN:
- case SNDRV_PCM_STATE_SETUP:
- case SNDRV_PCM_STATE_DISCONNECTED:
- err = -EBADFD;
- goto _endloop;
- case SNDRV_PCM_STATE_PAUSED:
- continue;
- }
- if (!tout) {
- pcm_dbg(substream->pcm,
- "%s write error (DMA or IRQ trouble?)\n",
- is_playback ? "playback" : "capture");
- err = -EIO;
- break;
- }
- }
- _endloop:
- set_current_state(TASK_RUNNING);
- remove_wait_queue(&runtime->tsleep, &wait);
- *availp = avail;
- return err;
- }
-
- static int snd_pcm_lib_write_transfer(struct snd_pcm_substream *substream,
- unsigned int hwoff,
- unsigned long data, unsigned int off,
- snd_pcm_uframes_t frames)
- {
- struct snd_pcm_runtime *runtime = substream->runtime;
- int err;
- char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
- if (substream->ops->copy) {
- if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
- return err;
- } else {
- char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
- if (copy_from_user(hwbuf, buf, frames_to_bytes(runtime, frames)))
- return -EFAULT;
- }
- return 0;
- }
-
- typedef int (*transfer_f)(struct snd_pcm_substream *substream, unsigned int hwoff,
- unsigned long data, unsigned int off,
- snd_pcm_uframes_t size);
- static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream,
- unsigned long data,
- snd_pcm_uframes_t size,
- int nonblock,
- transfer_f transfer)
- {
- struct snd_pcm_runtime *runtime = substream->runtime;
- snd_pcm_uframes_t xfer = 0;
- snd_pcm_uframes_t offset = 0;
- snd_pcm_uframes_t avail;
- int err = 0;
- if (size == 0)
- return 0;
- snd_pcm_stream_lock_irq(substream);
- switch (runtime->status->state) {
- case SNDRV_PCM_STATE_PREPARED:
- case SNDRV_PCM_STATE_RUNNING:
- case SNDRV_PCM_STATE_PAUSED:
- break;
- case SNDRV_PCM_STATE_XRUN:
- err = -EPIPE;
- goto _end_unlock;
- case SNDRV_PCM_STATE_SUSPENDED:
- err = -ESTRPIPE;
- goto _end_unlock;
- default:
- err = -EBADFD;
- goto _end_unlock;
- }
- runtime->twake = runtime->control->avail_min ? : 1;
- if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
- snd_pcm_update_hw_ptr(substream);
- avail = snd_pcm_playback_avail(runtime);
- while (size > 0) {
- snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
- snd_pcm_uframes_t cont;
- if (!avail) {
- if (nonblock) {
- err = -EAGAIN;
- goto _end_unlock;
- }
- runtime->twake = min_t(snd_pcm_uframes_t, size,
- runtime->control->avail_min ? : 1);
- err = wait_for_avail(substream, &avail);
- if (err < 0)
- goto _end_unlock;
- }
- frames = size > avail ? avail : size;
- cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
- if (frames > cont)
- frames = cont;
- if (snd_BUG_ON(!frames)) {
- runtime->twake = 0;
- snd_pcm_stream_unlock_irq(substream);
- return -EINVAL;
- }
- appl_ptr = runtime->control->appl_ptr;
- appl_ofs = appl_ptr % runtime->buffer_size;
- snd_pcm_stream_unlock_irq(substream);
- err = transfer(substream, appl_ofs, data, offset, frames);
- snd_pcm_stream_lock_irq(substream);
- if (err < 0)
- goto _end_unlock;
- switch (runtime->status->state) {
- case SNDRV_PCM_STATE_XRUN:
- err = -EPIPE;
- goto _end_unlock;
- case SNDRV_PCM_STATE_SUSPENDED:
- err = -ESTRPIPE;
- goto _end_unlock;
- default:
- break;
- }
- appl_ptr += frames;
- if (appl_ptr >= runtime->boundary)
- appl_ptr -= runtime->boundary;
- runtime->control->appl_ptr = appl_ptr;
- if (substream->ops->ack)
- substream->ops->ack(substream);
- offset += frames;
- size -= frames;
- xfer += frames;
- avail -= frames;
- if (runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
- snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) {
- err = snd_pcm_start(substream);
- if (err < 0)
- goto _end_unlock;
- }
- }
- _end_unlock:
- runtime->twake = 0;
- if (xfer > 0 && err >= 0)
- snd_pcm_update_state(substream, runtime);
- snd_pcm_stream_unlock_irq(substream);
- return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
- }
- static int pcm_sanity_check(struct snd_pcm_substream *substream)
- {
- struct snd_pcm_runtime *runtime;
- if (PCM_RUNTIME_CHECK(substream))
- return -ENXIO;
- runtime = substream->runtime;
- if (snd_BUG_ON(!substream->ops->copy && !runtime->dma_area))
- return -EINVAL;
- if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
- return -EBADFD;
- return 0;
- }
- snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream, const void __user *buf, snd_pcm_uframes_t size)
- {
- struct snd_pcm_runtime *runtime;
- int nonblock;
- int err;
- err = pcm_sanity_check(substream);
- if (err < 0)
- return err;
- runtime = substream->runtime;
- nonblock = !!(substream->f_flags & O_NONBLOCK);
- if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
- runtime->channels > 1)
- return -EINVAL;
- return snd_pcm_lib_write1(substream, (unsigned long)buf, size, nonblock,
- snd_pcm_lib_write_transfer);
- }
- EXPORT_SYMBOL(snd_pcm_lib_write);
- static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream *substream,
- unsigned int hwoff,
- unsigned long data, unsigned int off,
- snd_pcm_uframes_t frames)
- {
- struct snd_pcm_runtime *runtime = substream->runtime;
- int err;
- void __user **bufs = (void __user **)data;
- int channels = runtime->channels;
- int c;
- if (substream->ops->copy) {
- if (snd_BUG_ON(!substream->ops->silence))
- return -EINVAL;
- for (c = 0; c < channels; ++c, ++bufs) {
- if (*bufs == NULL) {
- if ((err = substream->ops->silence(substream, c, hwoff, frames)) < 0)
- return err;
- } else {
- char __user *buf = *bufs + samples_to_bytes(runtime, off);
- if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
- return err;
- }
- }
- } else {
-
- size_t dma_csize = runtime->dma_bytes / channels;
- for (c = 0; c < channels; ++c, ++bufs) {
- char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
- if (*bufs == NULL) {
- snd_pcm_format_set_silence(runtime->format, hwbuf, frames);
- } else {
- char __user *buf = *bufs + samples_to_bytes(runtime, off);
- if (copy_from_user(hwbuf, buf, samples_to_bytes(runtime, frames)))
- return -EFAULT;
- }
- }
- }
- return 0;
- }
-
- snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
- void __user **bufs,
- snd_pcm_uframes_t frames)
- {
- struct snd_pcm_runtime *runtime;
- int nonblock;
- int err;
- err = pcm_sanity_check(substream);
- if (err < 0)
- return err;
- runtime = substream->runtime;
- nonblock = !!(substream->f_flags & O_NONBLOCK);
- if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
- return -EINVAL;
- return snd_pcm_lib_write1(substream, (unsigned long)bufs, frames,
- nonblock, snd_pcm_lib_writev_transfer);
- }
- EXPORT_SYMBOL(snd_pcm_lib_writev);
- static int snd_pcm_lib_read_transfer(struct snd_pcm_substream *substream,
- unsigned int hwoff,
- unsigned long data, unsigned int off,
- snd_pcm_uframes_t frames)
- {
- struct snd_pcm_runtime *runtime = substream->runtime;
- int err;
- char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
- if (substream->ops->copy) {
- if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
- return err;
- } else {
- char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
- if (copy_to_user(buf, hwbuf, frames_to_bytes(runtime, frames)))
- return -EFAULT;
- }
- return 0;
- }
- static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream,
- unsigned long data,
- snd_pcm_uframes_t size,
- int nonblock,
- transfer_f transfer)
- {
- struct snd_pcm_runtime *runtime = substream->runtime;
- snd_pcm_uframes_t xfer = 0;
- snd_pcm_uframes_t offset = 0;
- snd_pcm_uframes_t avail;
- int err = 0;
- if (size == 0)
- return 0;
- snd_pcm_stream_lock_irq(substream);
- switch (runtime->status->state) {
- case SNDRV_PCM_STATE_PREPARED:
- if (size >= runtime->start_threshold) {
- err = snd_pcm_start(substream);
- if (err < 0)
- goto _end_unlock;
- }
- break;
- case SNDRV_PCM_STATE_DRAINING:
- case SNDRV_PCM_STATE_RUNNING:
- case SNDRV_PCM_STATE_PAUSED:
- break;
- case SNDRV_PCM_STATE_XRUN:
- err = -EPIPE;
- goto _end_unlock;
- case SNDRV_PCM_STATE_SUSPENDED:
- err = -ESTRPIPE;
- goto _end_unlock;
- default:
- err = -EBADFD;
- goto _end_unlock;
- }
- runtime->twake = runtime->control->avail_min ? : 1;
- if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
- snd_pcm_update_hw_ptr(substream);
- avail = snd_pcm_capture_avail(runtime);
- while (size > 0) {
- snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
- snd_pcm_uframes_t cont;
- if (!avail) {
- if (runtime->status->state ==
- SNDRV_PCM_STATE_DRAINING) {
- snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
- goto _end_unlock;
- }
- if (nonblock) {
- err = -EAGAIN;
- goto _end_unlock;
- }
- runtime->twake = min_t(snd_pcm_uframes_t, size,
- runtime->control->avail_min ? : 1);
- err = wait_for_avail(substream, &avail);
- if (err < 0)
- goto _end_unlock;
- if (!avail)
- continue;
- }
- frames = size > avail ? avail : size;
- cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
- if (frames > cont)
- frames = cont;
- if (snd_BUG_ON(!frames)) {
- runtime->twake = 0;
- snd_pcm_stream_unlock_irq(substream);
- return -EINVAL;
- }
- appl_ptr = runtime->control->appl_ptr;
- appl_ofs = appl_ptr % runtime->buffer_size;
- snd_pcm_stream_unlock_irq(substream);
- err = transfer(substream, appl_ofs, data, offset, frames);
- snd_pcm_stream_lock_irq(substream);
- if (err < 0)
- goto _end_unlock;
- switch (runtime->status->state) {
- case SNDRV_PCM_STATE_XRUN:
- err = -EPIPE;
- goto _end_unlock;
- case SNDRV_PCM_STATE_SUSPENDED:
- err = -ESTRPIPE;
- goto _end_unlock;
- default:
- break;
- }
- appl_ptr += frames;
- if (appl_ptr >= runtime->boundary)
- appl_ptr -= runtime->boundary;
- runtime->control->appl_ptr = appl_ptr;
- if (substream->ops->ack)
- substream->ops->ack(substream);
- offset += frames;
- size -= frames;
- xfer += frames;
- avail -= frames;
- }
- _end_unlock:
- runtime->twake = 0;
- if (xfer > 0 && err >= 0)
- snd_pcm_update_state(substream, runtime);
- snd_pcm_stream_unlock_irq(substream);
- return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
- }
- snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream, void __user *buf, snd_pcm_uframes_t size)
- {
- struct snd_pcm_runtime *runtime;
- int nonblock;
- int err;
-
- err = pcm_sanity_check(substream);
- if (err < 0)
- return err;
- runtime = substream->runtime;
- nonblock = !!(substream->f_flags & O_NONBLOCK);
- if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED)
- return -EINVAL;
- return snd_pcm_lib_read1(substream, (unsigned long)buf, size, nonblock, snd_pcm_lib_read_transfer);
- }
- EXPORT_SYMBOL(snd_pcm_lib_read);
- static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream *substream,
- unsigned int hwoff,
- unsigned long data, unsigned int off,
- snd_pcm_uframes_t frames)
- {
- struct snd_pcm_runtime *runtime = substream->runtime;
- int err;
- void __user **bufs = (void __user **)data;
- int channels = runtime->channels;
- int c;
- if (substream->ops->copy) {
- for (c = 0; c < channels; ++c, ++bufs) {
- char __user *buf;
- if (*bufs == NULL)
- continue;
- buf = *bufs + samples_to_bytes(runtime, off);
- if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
- return err;
- }
- } else {
- snd_pcm_uframes_t dma_csize = runtime->dma_bytes / channels;
- for (c = 0; c < channels; ++c, ++bufs) {
- char *hwbuf;
- char __user *buf;
- if (*bufs == NULL)
- continue;
- hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
- buf = *bufs + samples_to_bytes(runtime, off);
- if (copy_to_user(buf, hwbuf, samples_to_bytes(runtime, frames)))
- return -EFAULT;
- }
- }
- return 0;
- }
-
- snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
- void __user **bufs,
- snd_pcm_uframes_t frames)
- {
- struct snd_pcm_runtime *runtime;
- int nonblock;
- int err;
- err = pcm_sanity_check(substream);
- if (err < 0)
- return err;
- runtime = substream->runtime;
- if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
- return -EBADFD;
- nonblock = !!(substream->f_flags & O_NONBLOCK);
- if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
- return -EINVAL;
- return snd_pcm_lib_read1(substream, (unsigned long)bufs, frames, nonblock, snd_pcm_lib_readv_transfer);
- }
- EXPORT_SYMBOL(snd_pcm_lib_readv);
- const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[] = {
- { .channels = 1,
- .map = { SNDRV_CHMAP_MONO } },
- { .channels = 2,
- .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR } },
- { .channels = 4,
- .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
- SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
- { .channels = 6,
- .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
- SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
- SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE } },
- { .channels = 8,
- .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
- SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
- SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
- SNDRV_CHMAP_SL, SNDRV_CHMAP_SR } },
- { }
- };
- EXPORT_SYMBOL_GPL(snd_pcm_std_chmaps);
- const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[] = {
- { .channels = 1,
- .map = { SNDRV_CHMAP_MONO } },
- { .channels = 2,
- .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR } },
- { .channels = 4,
- .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
- SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
- { .channels = 6,
- .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
- SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
- SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
- { .channels = 8,
- .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
- SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
- SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
- SNDRV_CHMAP_SL, SNDRV_CHMAP_SR } },
- { }
- };
- EXPORT_SYMBOL_GPL(snd_pcm_alt_chmaps);
- static bool valid_chmap_channels(const struct snd_pcm_chmap *info, int ch)
- {
- if (ch > info->max_channels)
- return false;
- return !info->channel_mask || (info->channel_mask & (1U << ch));
- }
- static int pcm_chmap_ctl_info(struct snd_kcontrol *kcontrol,
- struct snd_ctl_elem_info *uinfo)
- {
- struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
- uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
- uinfo->count = 0;
- uinfo->count = info->max_channels;
- uinfo->value.integer.min = 0;
- uinfo->value.integer.max = SNDRV_CHMAP_LAST;
- return 0;
- }
- static int pcm_chmap_ctl_get(struct snd_kcontrol *kcontrol,
- struct snd_ctl_elem_value *ucontrol)
- {
- struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
- unsigned int idx = snd_ctl_get_ioffidx(kcontrol, &ucontrol->id);
- struct snd_pcm_substream *substream;
- const struct snd_pcm_chmap_elem *map;
- if (snd_BUG_ON(!info->chmap))
- return -EINVAL;
- substream = snd_pcm_chmap_substream(info, idx);
- if (!substream)
- return -ENODEV;
- memset(ucontrol->value.integer.value, 0,
- sizeof(ucontrol->value.integer.value));
- if (!substream->runtime)
- return 0;
- for (map = info->chmap; map->channels; map++) {
- int i;
- if (map->channels == substream->runtime->channels &&
- valid_chmap_channels(info, map->channels)) {
- for (i = 0; i < map->channels; i++)
- ucontrol->value.integer.value[i] = map->map[i];
- return 0;
- }
- }
- return -EINVAL;
- }
- static int pcm_chmap_ctl_tlv(struct snd_kcontrol *kcontrol, int op_flag,
- unsigned int size, unsigned int __user *tlv)
- {
- struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
- const struct snd_pcm_chmap_elem *map;
- unsigned int __user *dst;
- int c, count = 0;
- if (snd_BUG_ON(!info->chmap))
- return -EINVAL;
- if (size < 8)
- return -ENOMEM;
- if (put_user(SNDRV_CTL_TLVT_CONTAINER, tlv))
- return -EFAULT;
- size -= 8;
- dst = tlv + 2;
- for (map = info->chmap; map->channels; map++) {
- int chs_bytes = map->channels * 4;
- if (!valid_chmap_channels(info, map->channels))
- continue;
- if (size < 8)
- return -ENOMEM;
- if (put_user(SNDRV_CTL_TLVT_CHMAP_FIXED, dst) ||
- put_user(chs_bytes, dst + 1))
- return -EFAULT;
- dst += 2;
- size -= 8;
- count += 8;
- if (size < chs_bytes)
- return -ENOMEM;
- size -= chs_bytes;
- count += chs_bytes;
- for (c = 0; c < map->channels; c++) {
- if (put_user(map->map[c], dst))
- return -EFAULT;
- dst++;
- }
- }
- if (put_user(count, tlv + 1))
- return -EFAULT;
- return 0;
- }
- static void pcm_chmap_ctl_private_free(struct snd_kcontrol *kcontrol)
- {
- struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
- info->pcm->streams[info->stream].chmap_kctl = NULL;
- kfree(info);
- }
- int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream,
- const struct snd_pcm_chmap_elem *chmap,
- int max_channels,
- unsigned long private_value,
- struct snd_pcm_chmap **info_ret)
- {
- struct snd_pcm_chmap *info;
- struct snd_kcontrol_new knew = {
- .iface = SNDRV_CTL_ELEM_IFACE_PCM,
- .access = SNDRV_CTL_ELEM_ACCESS_READ |
- SNDRV_CTL_ELEM_ACCESS_TLV_READ |
- SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK,
- .info = pcm_chmap_ctl_info,
- .get = pcm_chmap_ctl_get,
- .tlv.c = pcm_chmap_ctl_tlv,
- };
- int err;
- info = kzalloc(sizeof(*info), GFP_KERNEL);
- if (!info)
- return -ENOMEM;
- info->pcm = pcm;
- info->stream = stream;
- info->chmap = chmap;
- info->max_channels = max_channels;
- if (stream == SNDRV_PCM_STREAM_PLAYBACK)
- knew.name = "Playback Channel Map";
- else
- knew.name = "Capture Channel Map";
- knew.device = pcm->device;
- knew.count = pcm->streams[stream].substream_count;
- knew.private_value = private_value;
- info->kctl = snd_ctl_new1(&knew, info);
- if (!info->kctl) {
- kfree(info);
- return -ENOMEM;
- }
- info->kctl->private_free = pcm_chmap_ctl_private_free;
- err = snd_ctl_add(pcm->card, info->kctl);
- if (err < 0)
- return err;
- pcm->streams[stream].chmap_kctl = info->kctl;
- if (info_ret)
- *info_ret = info;
- return 0;
- }
- EXPORT_SYMBOL_GPL(snd_pcm_add_chmap_ctls);
|