| /* |
| * Digital Audio (PCM) abstract layer |
| * Copyright (c) by Jaroslav Kysela <perex@perex.cz> |
| * Abramo Bagnara <abramo@alsa-project.org> |
| * |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; only version 2 of the License. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| * |
| */ |
| |
| #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/info.h> |
| #include <sound/pcm.h> |
| #include <sound/pcm_params.h> |
| #include <sound/timer.h> |
| |
| /* |
| * fill ring buffer with silence |
| * runtime->silence_start: starting pointer to silence area |
| * runtime->silence_filled: size filled with silence |
| * runtime->silence_threshold: threshold from application |
| * runtime->silence_size: maximal size from application |
| * |
| * when runtime->silence_size >= runtime->boundary - fill processed area with silence immediately |
| */ |
| 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) { /* initialization */ |
| 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 */ |
| #define XRUN_DEBUG_PERIODUPDATE (1<<3) /* full period update info */ |
| #define XRUN_DEBUG_HWPTRUPDATE (1<<4) /* full hwptr update info */ |
| #define XRUN_DEBUG_LOG (1<<5) /* show last 10 positions on err */ |
| #define XRUN_DEBUG_LOGONCE (1<<6) /* do above only once */ |
| |
| #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; |
| |
| 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)); |
| snd_printd(KERN_DEBUG "XRUN: %s\n", name); |
| dump_stack_on_xrun(substream); |
| } |
| } |
| |
| #ifdef CONFIG_SND_PCM_XRUN_DEBUG |
| #define hw_ptr_error(substream, fmt, args...) \ |
| do { \ |
| if (xrun_debug(substream, XRUN_DEBUG_BASIC)) { \ |
| xrun_log_show(substream); \ |
| if (printk_ratelimit()) { \ |
| snd_printd("PCM: " fmt, ##args); \ |
| } \ |
| dump_stack_on_xrun(substream); \ |
| } \ |
| } while (0) |
| |
| #define XRUN_LOG_CNT 10 |
| |
| struct hwptr_log_entry { |
| unsigned int in_interrupt; |
| unsigned long jiffies; |
| snd_pcm_uframes_t pos; |
| snd_pcm_uframes_t period_size; |
| snd_pcm_uframes_t buffer_size; |
| snd_pcm_uframes_t old_hw_ptr; |
| snd_pcm_uframes_t hw_ptr_base; |
| }; |
| |
| struct snd_pcm_hwptr_log { |
| unsigned int idx; |
| unsigned int hit: 1; |
| struct hwptr_log_entry entries[XRUN_LOG_CNT]; |
| }; |
| |
| static void xrun_log(struct snd_pcm_substream *substream, |
| snd_pcm_uframes_t pos, int in_interrupt) |
| { |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| struct snd_pcm_hwptr_log *log = runtime->hwptr_log; |
| struct hwptr_log_entry *entry; |
| |
| if (log == NULL) { |
| log = kzalloc(sizeof(*log), GFP_ATOMIC); |
| if (log == NULL) |
| return; |
| runtime->hwptr_log = log; |
| } else { |
| if (xrun_debug(substream, XRUN_DEBUG_LOGONCE) && log->hit) |
| return; |
| } |
| entry = &log->entries[log->idx]; |
| entry->in_interrupt = in_interrupt; |
| entry->jiffies = jiffies; |
| entry->pos = pos; |
| entry->period_size = runtime->period_size; |
| entry->buffer_size = runtime->buffer_size; |
| entry->old_hw_ptr = runtime->status->hw_ptr; |
| entry->hw_ptr_base = runtime->hw_ptr_base; |
| log->idx = (log->idx + 1) % XRUN_LOG_CNT; |
| } |
| |
| static void xrun_log_show(struct snd_pcm_substream *substream) |
| { |
| struct snd_pcm_hwptr_log *log = substream->runtime->hwptr_log; |
| struct hwptr_log_entry *entry; |
| char name[16]; |
| unsigned int idx; |
| int cnt; |
| |
| if (log == NULL) |
| return; |
| if (xrun_debug(substream, XRUN_DEBUG_LOGONCE) && log->hit) |
| return; |
| snd_pcm_debug_name(substream, name, sizeof(name)); |
| for (cnt = 0, idx = log->idx; cnt < XRUN_LOG_CNT; cnt++) { |
| entry = &log->entries[idx]; |
| if (entry->period_size == 0) |
| break; |
| snd_printd("hwptr log: %s: %sj=%lu, pos=%ld/%ld/%ld, " |
| "hwptr=%ld/%ld\n", |
| name, entry->in_interrupt ? "[Q] " : "", |
| entry->jiffies, |
| (unsigned long)entry->pos, |
| (unsigned long)entry->period_size, |
| (unsigned long)entry->buffer_size, |
| (unsigned long)entry->old_hw_ptr, |
| (unsigned long)entry->hw_ptr_base); |
| idx++; |
| idx %= XRUN_LOG_CNT; |
| } |
| log->hit = 1; |
| } |
| |
| #else /* ! CONFIG_SND_PCM_XRUN_DEBUG */ |
| |
| #define hw_ptr_error(substream, fmt, args...) do { } while (0) |
| #define xrun_log(substream, pos, in_interrupt) do { } while (0) |
| #define xrun_log_show(substream) 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 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; |
| |
| old_hw_ptr = runtime->status->hw_ptr; |
| pos = substream->ops->pointer(substream); |
| 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)); |
| xrun_log_show(substream); |
| snd_printd(KERN_ERR "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; |
| if (xrun_debug(substream, XRUN_DEBUG_LOG)) |
| xrun_log(substream, pos, in_interrupt); |
| hw_base = runtime->hw_ptr_base; |
| new_hw_ptr = hw_base + pos; |
| if (in_interrupt) { |
| /* we know that one period was processed */ |
| /* delta = "expected next hw_ptr" for in_interrupt != 0 */ |
| delta = runtime->hw_ptr_interrupt + runtime->period_size; |
| if (delta > new_hw_ptr) { |
| /* check for double acknowledged interrupts */ |
| hdelta = jiffies - runtime->hw_ptr_jiffies; |
| if (hdelta > runtime->hw_ptr_buffer_jiffies/2) { |
| hw_base += runtime->buffer_size; |
| if (hw_base >= runtime->boundary) |
| hw_base = 0; |
| new_hw_ptr = hw_base + pos; |
| goto __delta; |
| } |
| } |
| } |
| /* new_hw_ptr might be lower than old_hw_ptr in case when */ |
| /* pointer crosses the end of the ring buffer */ |
| if (new_hw_ptr < old_hw_ptr) { |
| hw_base += runtime->buffer_size; |
| if (hw_base >= runtime->boundary) |
| hw_base = 0; |
| new_hw_ptr = hw_base + pos; |
| } |
| __delta: |
| delta = new_hw_ptr - old_hw_ptr; |
| if (delta < 0) |
| delta += runtime->boundary; |
| if (xrun_debug(substream, in_interrupt ? |
| XRUN_DEBUG_PERIODUPDATE : XRUN_DEBUG_HWPTRUPDATE)) { |
| char name[16]; |
| snd_pcm_debug_name(substream, name, sizeof(name)); |
| snd_printd("%s_update: %s: pos=%u/%u/%u, " |
| "hwptr=%ld/%ld/%ld/%ld\n", |
| in_interrupt ? "period" : "hwptr", |
| name, |
| (unsigned int)pos, |
| (unsigned int)runtime->period_size, |
| (unsigned int)runtime->buffer_size, |
| (unsigned long)delta, |
| (unsigned long)old_hw_ptr, |
| (unsigned long)new_hw_ptr, |
| (unsigned long)runtime->hw_ptr_base); |
| } |
| |
| if (runtime->no_period_wakeup) { |
| snd_pcm_sframes_t xrun_threshold; |
| /* |
| * Without regular period interrupts, we have to check |
| * the elapsed time to detect xruns. |
| */ |
| jdelta = 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; |
| new_hw_ptr = hw_base + pos; |
| hdelta -= runtime->hw_ptr_buffer_jiffies; |
| } |
| goto no_delta_check; |
| } |
| |
| /* something must be really wrong */ |
| if (delta >= runtime->buffer_size + runtime->period_size) { |
| hw_ptr_error(substream, |
| "Unexpected hw_pointer value %s" |
| "(stream=%i, pos=%ld, new_hw_ptr=%ld, " |
| "old_hw_ptr=%ld)\n", |
| in_interrupt ? "[Q] " : "[P]", |
| substream->stream, (long)pos, |
| (long)new_hw_ptr, (long)old_hw_ptr); |
| return 0; |
| } |
| |
| /* Do jiffies check only in xrun_debug mode */ |
| if (!xrun_debug(substream, XRUN_DEBUG_JIFFIESCHECK)) |
| goto no_jiffies_check; |
| |
| /* Skip the jiffies check for hardwares with BATCH flag. |
| * Such hardware usually just increases the position at each IRQ, |
| * thus it can't give any strange position. |
| */ |
| 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 = jiffies - runtime->hw_ptr_jiffies; |
| if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) { |
| delta = jdelta / |
| (((runtime->period_size * HZ) / runtime->rate) |
| + HZ/100); |
| /* move new_hw_ptr according jiffies not pos variable */ |
| new_hw_ptr = old_hw_ptr; |
| hw_base = delta; |
| /* use loop to avoid checks for delta overflows */ |
| /* the delta value is small or zero in most cases */ |
| while (delta > 0) { |
| new_hw_ptr += runtime->period_size; |
| if (new_hw_ptr >= runtime->boundary) |
| new_hw_ptr -= runtime->boundary; |
| delta--; |
| } |
| /* align hw_base to buffer_size */ |
| hw_ptr_error(substream, |
| "hw_ptr skipping! %s" |
| "(pos=%ld, delta=%ld, period=%ld, " |
| "jdelta=%lu/%lu/%lu, hw_ptr=%ld/%ld)\n", |
| in_interrupt ? "[Q] " : "", |
| (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); |
| /* reset values to proper state */ |
| 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, |
| "Lost interrupts? %s" |
| "(stream=%i, delta=%ld, new_hw_ptr=%ld, " |
| "old_hw_ptr=%ld)\n", |
| in_interrupt ? "[Q] " : "", |
| substream->stream, (long)delta, |
| (long)new_hw_ptr, |
| (long)old_hw_ptr); |
| } |
| |
| no_delta_check: |
| if (runtime->status->hw_ptr == new_hw_ptr) |
| 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 = jiffies; |
| if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) |
| snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp); |
| |
| return snd_pcm_update_state(substream, runtime); |
| } |
| |
| /* CAUTION: call it with irq disabled */ |
| int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream) |
| { |
| return snd_pcm_update_hw_ptr0(substream, 0); |
| } |
| |
| /** |
| * snd_pcm_set_ops - set the PCM operators |
| * @pcm: the pcm instance |
| * @direction: stream direction, SNDRV_PCM_STREAM_XXX |
| * @ops: the operator table |
| * |
| * Sets the given PCM operators to the pcm instance. |
| */ |
| void snd_pcm_set_ops(struct snd_pcm *pcm, int direction, 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); |
| |
| /** |
| * snd_pcm_sync - set the PCM sync id |
| * @substream: the pcm substream |
| * |
| * Sets the PCM sync identifier for the card. |
| */ |
| 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); |
| |
| /* |
| * Standard ioctl routine |
| */ |
| |
| 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; |
| } |
| |
| /** |
| * snd_interval_refine - refine the interval value of configurator |
| * @i: the interval value to refine |
| * @v: the interval value to refer to |
| * |
| * Refines the interval value with the reference value. |
| * The interval is changed to the range satisfying both intervals. |
| * The interval status (min, max, integer, etc.) are evaluated. |
| * |
| * Returns non-zero if the value is changed, zero if not changed. |
| */ |
| 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); |
| } |
| |
| /** |
| * snd_interval_div - refine the interval value with division |
| * @a: dividend |
| * @b: divisor |
| * @c: quotient |
| * |
| * c = a / b |
| * |
| * Returns non-zero if the value is changed, zero if not changed. |
| */ |
| 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; |
| } |
| |
| /** |
| * snd_interval_muldivk - refine the interval value |
| * @a: dividend 1 |
| * @b: dividend 2 |
| * @k: divisor (as integer) |
| * @c: result |
| * |
| * c = a * b / k |
| * |
| * Returns non-zero if the value is changed, zero if not changed. |
| */ |
| 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; |
| } |
| |
| /** |
| * snd_interval_mulkdiv - refine the interval value |
| * @a: dividend 1 |
| * @k: dividend 2 (as integer) |
| * @b: divisor |
| * @c: result |
| * |
| * c = a * k / b |
| * |
| * Returns non-zero if the value is changed, zero if not changed. |
| */ |
| 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; |
| } |
| |
| /* ---- */ |
| |
| |
| /** |
| * snd_interval_ratnum - refine the interval value |
| * @i: interval to refine |
| * @rats_count: number of ratnum_t |
| * @rats: ratnum_t array |
| * @nump: pointer to store the resultant numerator |
| * @denp: pointer to store the resultant denominator |
| * |
| * Returns non-zero if the value is changed, zero if not changed. |
| */ |
| 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); |
| |
| /** |
| * snd_interval_ratden - refine the interval value |
| * @i: interval to refine |
| * @rats_count: number of struct ratden |
| * @rats: struct ratden array |
| * @nump: pointer to store the resultant numerator |
| * @denp: pointer to store the resultant denominator |
| * |
| * Returns non-zero if the value is changed, zero if not changed. |
| */ |
| 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; |
| } |
| |
| /** |
| * snd_interval_list - refine the interval value from the list |
| * @i: the interval value to refine |
| * @count: the number of elements in the list |
| * @list: the value list |
| * @mask: the bit-mask to evaluate |
| * |
| * Refines the interval value from the list. |
| * When mask is non-zero, only the elements corresponding to bit 1 are |
| * evaluated. |
| * |
| * Returns non-zero if the value is changed, zero if not changed. |
| */ |
| int snd_interval_list(struct snd_interval *i, unsigned int count, |
| 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); |
| |
| static int snd_interval_step(struct snd_interval *i, unsigned int min, unsigned int step) |
| { |
| unsigned int n; |
| int changed = 0; |
| n = (i->min - min) % step; |
| if (n != 0 || i->openmin) { |
| i->min += step - n; |
| changed = 1; |
| } |
| n = (i->max - min) % step; |
| if (n != 0 || i->openmax) { |
| i->max -= n; |
| changed = 1; |
| } |
| if (snd_interval_checkempty(i)) { |
| i->empty = 1; |
| return -EINVAL; |
| } |
| return changed; |
| } |
| |
| /* Info constraints helpers */ |
| |
| /** |
| * snd_pcm_hw_rule_add - add the hw-constraint rule |
| * @runtime: the pcm runtime instance |
| * @cond: condition bits |
| * @var: the variable to evaluate |
| * @func: the evaluation function |
| * @private: the private data pointer passed to function |
| * @dep: the dependent variables |
| * |
| * Returns zero if successful, or a negative error code on failure. |
| */ |
| 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); |
| |
| /** |
| * snd_pcm_hw_constraint_mask - apply the given bitmap mask constraint |
| * @runtime: PCM runtime instance |
| * @var: hw_params variable to apply the mask |
| * @mask: the bitmap mask |
| * |
| * Apply the constraint of the given bitmap mask to a 32-bit mask parameter. |
| */ |
| 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); /* clear rest */ |
| if (*maskp->bits == 0) |
| return -EINVAL; |
| return 0; |
| } |
| |
| /** |
| * snd_pcm_hw_constraint_mask64 - apply the given bitmap mask constraint |
| * @runtime: PCM runtime instance |
| * @var: hw_params variable to apply the mask |
| * @mask: the 64bit bitmap mask |
| * |
| * Apply the constraint of the given bitmap mask to a 64-bit mask parameter. |
| */ |
| 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); /* clear rest */ |
| if (! maskp->bits[0] && ! maskp->bits[1]) |
| return -EINVAL; |
| return 0; |
| } |
| |
| /** |
| * snd_pcm_hw_constraint_integer - apply an integer constraint to an interval |
| * @runtime: PCM runtime instance |
| * @var: hw_params variable to apply the integer constraint |
| * |
| * Apply the constraint of integer to an interval parameter. |
| */ |
| 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); |
| |
| /** |
| * snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval |
| * @runtime: PCM runtime instance |
| * @var: hw_params variable to apply the range |
| * @min: the minimal value |
| * @max: the maximal value |
| * |
| * Apply the min/max range constraint to an interval parameter. |
| */ |
| 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); |
| } |
| |
| |
| /** |
| * snd_pcm_hw_constraint_list - apply a list of constraints to a parameter |
| * @runtime: PCM runtime instance |
| * @cond: condition bits |
| * @var: hw_params variable to apply the list constraint |
| * @l: list |
| * |
| * Apply the list of constraints to an interval parameter. |
| */ |
| int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime, |
| unsigned int cond, |
| snd_pcm_hw_param_t var, |
| struct snd_pcm_hw_constraint_list *l) |
| { |
| return snd_pcm_hw_rule_add(runtime, cond, var, |
| snd_pcm_hw_rule_list, l, |
| var, -1); |
| } |
| |
| EXPORT_SYMBOL(snd_pcm_hw_constraint_list); |
| |
| 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; |
| } |
| |
| /** |
| * snd_pcm_hw_constraint_ratnums - apply ratnums constraint to a parameter |
| * @runtime: PCM runtime instance |
| * @cond: condition bits |
| * @var: hw_params variable to apply the ratnums constraint |
| * @r: struct snd_ratnums constriants |
| */ |
| 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; |
| } |
| |
| /** |
| * snd_pcm_hw_constraint_ratdens - apply ratdens constraint to a parameter |
| * @runtime: PCM runtime instance |
| * @cond: condition bits |
| * @var: hw_params variable to apply the ratdens constraint |
| * @r: struct snd_ratdens constriants |
| */ |
| 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) && snd_interval_value(i) == width) |
| params->msbits = msbits; |
| return 0; |
| } |
| |
| /** |
| * snd_pcm_hw_constraint_msbits - add a hw constraint msbits rule |
| * @runtime: PCM runtime instance |
| * @cond: condition bits |
| * @width: sample bits width |
| * @msbits: msbits width |
| */ |
| 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), 0, step); |
| } |
| |
| /** |
| * snd_pcm_hw_constraint_step - add a hw constraint step rule |
| * @runtime: PCM runtime instance |
| * @cond: condition bits |
| * @var: hw_params variable to apply the step constraint |
| * @step: step size |
| */ |
| 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); |
| } |
| |
| /** |
| * snd_pcm_hw_constraint_pow2 - add a hw constraint power-of-2 rule |
| * @runtime: PCM runtime instance |
| * @cond: condition bits |
| * @var: hw_params variable to apply the power-of-2 constraint |
| */ |
| 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); |
| } |
| |
| /** |
| * snd_pcm_hw_rule_noresample - add a rule to allow disabling hw resampling |
| * @runtime: PCM runtime instance |
| * @base_rate: the rate at which the hardware does not resample |
| */ |
| 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); |
| |
| /** |
| * snd_pcm_hw_param_value - return @params field @var value |
| * @params: the hw_params instance |
| * @var: parameter to retrieve |
| * @dir: pointer to the direction (-1,0,1) or %NULL |
| * |
| * Return the value for field @var if it's fixed in configuration space |
| * defined by @params. Return -%EINVAL otherwise. |
| */ |
| 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; |
| } |
| |
| |
| /** |
| * snd_pcm_hw_param_first - refine config space and return minimum value |
| * @pcm: PCM instance |
| * @params: the hw_params instance |
| * @var: parameter to retrieve |
| * @dir: pointer to the direction (-1,0,1) or %NULL |
| * |
| * Inside configuration space defined by @params remove from @var all |
| * values > minimum. Reduce configuration space accordingly. |
| * Return the minimum. |
| */ |
| 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; |
| } |
| |
| |
| /** |
| * snd_pcm_hw_param_last - refine config space and return maximum value |
| * @pcm: PCM instance |
| * @params: the hw_params instance |
| * @var: parameter to retrieve |
| * @dir: pointer to the direction (-1,0,1) or %NULL |
| * |
| * Inside configuration space defined by @params remove from @var all |
| * values < maximum. Reduce configuration space accordingly. |
| * Return the maximum. |
| */ |
| 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); |
| |
| /** |
| * snd_pcm_hw_param_choose - choose a configuration defined by @params |
| * @pcm: PCM instance |
| * @params: the hw_params instance |
| * |
| * Choose one configuration from configuration space defined by @params. |
| * The configuration chosen is that obtained fixing in this order: |
| * first access, first format, first subformat, min channels, |
| * min rate, min period time, max buffer size, min tick time |
| */ |
| 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; |
| 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, width; |
| |
| 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); |
| width = snd_pcm_format_physical_width(format); |
| params->fifo_size /= width * channels; |
| } |
| return 0; |
| } |
| |
| /** |
| * snd_pcm_lib_ioctl - a generic PCM ioctl callback |
| * @substream: the pcm substream instance |
| * @cmd: ioctl command |
| * @arg: ioctl argument |
| * |
| * Processes the generic ioctl commands for PCM. |
| * Can be passed as the ioctl callback for PCM ops. |
| * |
| * Returns zero if successful, or a negative error code on failure. |
| */ |
| 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); |
| |
| /** |
| * snd_pcm_period_elapsed - update the pcm status for the next period |
| * @substream: the pcm substream instance |
| * |
| * This function is called from the interrupt handler when the |
| * PCM has processed the period size. It will update the current |
| * pointer, wake up sleepers, etc. |
| * |
| * Even if more than one periods have elapsed since the last call, you |
| * have to call this only once. |
| */ |
| 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); |
| |
| /* |
| * Wait until avail_min data becomes available |
| * Returns a negative error code if any error occurs during operation. |
| * The available space is stored on availp. When err = 0 and avail = 0 |
| * on the capture stream, it indicates the stream is in DRAINING state. |
| */ |
| 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; |
| } |
| |
| /* |
| * We need to check if space became available already |
| * (and thus the wakeup happened already) first to close |
| * the race of space already having become available. |
| * This check must happen after been added to the waitqueue |
| * and having current state be INTERRUPTIBLE. |
| */ |
| 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; /* indicate draining */ |
| goto _endloop; |
| case SNDRV_PCM_STATE_OPEN: |
| case SNDRV_PCM_STATE_SETUP: |
| case SNDRV_PCM_STATE_DISCONNECTED: |
| err = -EBADFD; |
| goto _endloop; |
| } |
| if (!tout) { |
| snd_printd("%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; |
| 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; |
| while (size > 0) { |
| snd_pcm_uframes_t frames, appl_ptr, appl_ofs; |
| snd_pcm_uframes_t avail; |
| snd_pcm_uframes_t cont; |
| if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) |
| snd_pcm_update_hw_ptr(substream); |
| avail = snd_pcm_playback_avail(runtime); |
| 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; |
| 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; |
| } |
| |
| /* sanity-check for read/write methods */ |
| static int pcm_sanity_check(struct snd_pcm_substream *substream) |
| { |
| struct snd_pcm_runtime *runtime; |
| if (PCM_RUNTIME_CHECK(substream)) |
| return -ENXIO; |
| /* TODO: consider and -EINVAL here */ |
| if (substream->hw_no_buffer) |
| snd_printd("%s: warning this PCM is host less\n", __func__); |
| 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 { |
| /* default transfer behaviour */ |
| 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; |
| 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; |
| while (size > 0) { |
| snd_pcm_uframes_t frames, appl_ptr, appl_ofs; |
| snd_pcm_uframes_t avail; |
| snd_pcm_uframes_t cont; |
| if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) |
| snd_pcm_update_hw_ptr(substream); |
| avail = snd_pcm_capture_avail(runtime); |
| 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; /* draining */ |
| } |
| 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; |
| } |
| _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); |