/* * Digital Audio (PCM) abstract layer * Copyright (c) by Jaroslav Kysela * * * 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; either version 2 of the License, or * (at your option) any later version. * * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* * Compatibility */ struct snd_pcm_hw_params_old { unsigned int flags; unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT - SNDRV_PCM_HW_PARAM_ACCESS + 1]; struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME - SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1]; unsigned int rmask; unsigned int cmask; unsigned int info; unsigned int msbits; unsigned int rate_num; unsigned int rate_den; snd_pcm_uframes_t fifo_size; unsigned char reserved[64]; }; #ifdef CONFIG_SND_SUPPORT_OLD_API #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old) #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old) static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, struct snd_pcm_hw_params_old __user * _oparams); static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, struct snd_pcm_hw_params_old __user * _oparams); #endif static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream); /* * */ static DEFINE_RWLOCK(snd_pcm_link_rwlock); static DECLARE_RWSEM(snd_pcm_link_rwsem); /* Writer in rwsem may block readers even during its waiting in queue, * and this may lead to a deadlock when the code path takes read sem * twice (e.g. one in snd_pcm_action_nonatomic() and another in * snd_pcm_stream_lock()). As a (suboptimal) workaround, let writer to * sleep until all the readers are completed without blocking by writer. */ static inline void down_write_nonfifo(struct rw_semaphore *lock) { while (!down_write_trylock(lock)) msleep(1); } /** * snd_pcm_stream_lock - Lock the PCM stream * @substream: PCM substream * * This locks the PCM stream's spinlock or mutex depending on the nonatomic * flag of the given substream. This also takes the global link rw lock * (or rw sem), too, for avoiding the race with linked streams. */ void snd_pcm_stream_lock(struct snd_pcm_substream *substream) { if (substream->pcm->nonatomic) { down_read_nested(&snd_pcm_link_rwsem, SINGLE_DEPTH_NESTING); mutex_lock(&substream->self_group.mutex); } else { read_lock(&snd_pcm_link_rwlock); spin_lock(&substream->self_group.lock); } } EXPORT_SYMBOL_GPL(snd_pcm_stream_lock); /** * snd_pcm_stream_lock - Unlock the PCM stream * @substream: PCM substream * * This unlocks the PCM stream that has been locked via snd_pcm_stream_lock(). */ void snd_pcm_stream_unlock(struct snd_pcm_substream *substream) { if (substream->pcm->nonatomic) { mutex_unlock(&substream->self_group.mutex); up_read(&snd_pcm_link_rwsem); } else { spin_unlock(&substream->self_group.lock); read_unlock(&snd_pcm_link_rwlock); } } EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock); /** * snd_pcm_stream_lock_irq - Lock the PCM stream * @substream: PCM substream * * This locks the PCM stream like snd_pcm_stream_lock() and disables the local * IRQ (only when nonatomic is false). In nonatomic case, this is identical * as snd_pcm_stream_lock(). */ void snd_pcm_stream_lock_irq(struct snd_pcm_substream *substream) { if (!substream->pcm->nonatomic) local_irq_disable(); snd_pcm_stream_lock(substream); } EXPORT_SYMBOL_GPL(snd_pcm_stream_lock_irq); /** * snd_pcm_stream_unlock_irq - Unlock the PCM stream * @substream: PCM substream * * This is a counter-part of snd_pcm_stream_lock_irq(). */ void snd_pcm_stream_unlock_irq(struct snd_pcm_substream *substream) { snd_pcm_stream_unlock(substream); if (!substream->pcm->nonatomic) local_irq_enable(); } EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irq); unsigned long _snd_pcm_stream_lock_irqsave(struct snd_pcm_substream *substream) { unsigned long flags = 0; if (!substream->pcm->nonatomic) local_irq_save(flags); snd_pcm_stream_lock(substream); return flags; } EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave); /** * snd_pcm_stream_unlock_irqrestore - Unlock the PCM stream * @substream: PCM substream * @flags: irq flags * * This is a counter-part of snd_pcm_stream_lock_irqsave(). */ void snd_pcm_stream_unlock_irqrestore(struct snd_pcm_substream *substream, unsigned long flags) { snd_pcm_stream_unlock(substream); if (!substream->pcm->nonatomic) local_irq_restore(flags); } EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore); static inline mm_segment_t snd_enter_user(void) { mm_segment_t fs = get_fs(); set_fs(get_ds()); return fs; } static inline void snd_leave_user(mm_segment_t fs) { set_fs(fs); } int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info) { struct snd_pcm_runtime *runtime; struct snd_pcm *pcm = substream->pcm; struct snd_pcm_str *pstr = substream->pstr; memset(info, 0, sizeof(*info)); info->card = pcm->card->number; info->device = pcm->device; info->stream = substream->stream; info->subdevice = substream->number; strlcpy(info->id, pcm->id, sizeof(info->id)); strlcpy(info->name, pcm->name, sizeof(info->name)); info->dev_class = pcm->dev_class; info->dev_subclass = pcm->dev_subclass; info->subdevices_count = pstr->substream_count; info->subdevices_avail = pstr->substream_count - pstr->substream_opened; strlcpy(info->subname, substream->name, sizeof(info->subname)); runtime = substream->runtime; return 0; } int snd_pcm_info_user(struct snd_pcm_substream *substream, struct snd_pcm_info __user * _info) { struct snd_pcm_info *info; int err; info = kmalloc(sizeof(*info), GFP_KERNEL); if (! info) return -ENOMEM; err = snd_pcm_info(substream, info); if (err >= 0) { if (copy_to_user(_info, info, sizeof(*info))) err = -EFAULT; } kfree(info); return err; } static bool hw_support_mmap(struct snd_pcm_substream *substream) { if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP)) return false; /* check architectures that return -EINVAL from dma_mmap_coherent() */ /* FIXME: this should be some global flag */ #if defined(CONFIG_C6X) || defined(CONFIG_FRV) || defined(CONFIG_MN10300) ||\ defined(CONFIG_PARISC) || defined(CONFIG_XTENSA) if (!substream->ops->mmap && substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) return false; #endif return true; } #undef RULES_DEBUG #ifdef RULES_DEBUG #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v static const char * const snd_pcm_hw_param_names[] = { HW_PARAM(ACCESS), HW_PARAM(FORMAT), HW_PARAM(SUBFORMAT), HW_PARAM(SAMPLE_BITS), HW_PARAM(FRAME_BITS), HW_PARAM(CHANNELS), HW_PARAM(RATE), HW_PARAM(PERIOD_TIME), HW_PARAM(PERIOD_SIZE), HW_PARAM(PERIOD_BYTES), HW_PARAM(PERIODS), HW_PARAM(BUFFER_TIME), HW_PARAM(BUFFER_SIZE), HW_PARAM(BUFFER_BYTES), HW_PARAM(TICK_TIME), }; #endif int snd_pcm_hw_refine(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params) { unsigned int k; struct snd_pcm_hardware *hw; struct snd_interval *i = NULL; struct snd_mask *m = NULL; struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints; unsigned int rstamps[constrs->rules_num]; unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1]; unsigned int stamp = 2; int changed, again; params->info = 0; params->fifo_size = 0; if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS)) params->msbits = 0; if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) { params->rate_num = 0; params->rate_den = 0; } for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { m = hw_param_mask(params, k); if (snd_mask_empty(m)) return -EINVAL; if (!(params->rmask & (1 << k))) continue; #ifdef RULES_DEBUG pr_debug("%s = ", snd_pcm_hw_param_names[k]); pr_cont("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]); #endif changed = snd_mask_refine(m, constrs_mask(constrs, k)); #ifdef RULES_DEBUG pr_cont("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]); #endif if (changed) params->cmask |= 1 << k; if (changed < 0) return changed; } for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { i = hw_param_interval(params, k); if (snd_interval_empty(i)) return -EINVAL; if (!(params->rmask & (1 << k))) continue; #ifdef RULES_DEBUG pr_debug("%s = ", snd_pcm_hw_param_names[k]); if (i->empty) pr_cont("empty"); else pr_cont("%c%u %u%c", i->openmin ? '(' : '[', i->min, i->max, i->openmax ? ')' : ']'); pr_cont(" -> "); #endif changed = snd_interval_refine(i, constrs_interval(constrs, k)); #ifdef RULES_DEBUG if (i->empty) pr_cont("empty\n"); else pr_cont("%c%u %u%c\n", i->openmin ? '(' : '[', i->min, i->max, i->openmax ? ')' : ']'); #endif if (changed) params->cmask |= 1 << k; if (changed < 0) return changed; } for (k = 0; k < constrs->rules_num; k++) rstamps[k] = 0; for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0; do { again = 0; for (k = 0; k < constrs->rules_num; k++) { struct snd_pcm_hw_rule *r = &constrs->rules[k]; unsigned int d; int doit = 0; if (r->cond && !(r->cond & params->flags)) continue; for (d = 0; r->deps[d] >= 0; d++) { if (vstamps[r->deps[d]] > rstamps[k]) { doit = 1; break; } } if (!doit) continue; #ifdef RULES_DEBUG pr_debug("Rule %d [%p]: ", k, r->func); if (r->var >= 0) { pr_cont("%s = ", snd_pcm_hw_param_names[r->var]); if (hw_is_mask(r->var)) { m = hw_param_mask(params, r->var); pr_cont("%x", *m->bits); } else { i = hw_param_interval(params, r->var); if (i->empty) pr_cont("empty"); else pr_cont("%c%u %u%c", i->openmin ? '(' : '[', i->min, i->max, i->openmax ? ')' : ']'); } } #endif changed = r->func(params, r); #ifdef RULES_DEBUG if (r->var >= 0) { pr_cont(" -> "); if (hw_is_mask(r->var)) pr_cont("%x", *m->bits); else { if (i->empty) pr_cont("empty"); else pr_cont("%c%u %u%c", i->openmin ? '(' : '[', i->min, i->max, i->openmax ? ')' : ']'); } } pr_cont("\n"); #endif rstamps[k] = stamp; if (changed && r->var >= 0) { params->cmask |= (1 << r->var); vstamps[r->var] = stamp; again = 1; } if (changed < 0) return changed; stamp++; } } while (again); if (!params->msbits) { i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS); if (snd_interval_single(i)) params->msbits = snd_interval_value(i); } if (!params->rate_den) { i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); if (snd_interval_single(i)) { params->rate_num = snd_interval_value(i); params->rate_den = 1; } } hw = &substream->runtime->hw; if (!params->info) { params->info = hw->info & ~(SNDRV_PCM_INFO_FIFO_IN_FRAMES | SNDRV_PCM_INFO_DRAIN_TRIGGER); if (!hw_support_mmap(substream)) params->info &= ~(SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID); } if (!params->fifo_size) { m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); if (snd_mask_min(m) == snd_mask_max(m) && snd_interval_min(i) == snd_interval_max(i)) { changed = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_FIFO_SIZE, params); if (changed < 0) return changed; } } params->rmask = 0; return 0; } EXPORT_SYMBOL(snd_pcm_hw_refine); static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream, struct snd_pcm_hw_params __user * _params) { struct snd_pcm_hw_params *params; int err; params = memdup_user(_params, sizeof(*params)); if (IS_ERR(params)) return PTR_ERR(params); err = snd_pcm_hw_refine(substream, params); if (copy_to_user(_params, params, sizeof(*params))) { if (!err) err = -EFAULT; } kfree(params); return err; } static int period_to_usecs(struct snd_pcm_runtime *runtime) { int usecs; if (! runtime->rate) return -1; /* invalid */ /* take 75% of period time as the deadline */ usecs = (750000 / runtime->rate) * runtime->period_size; usecs += ((750000 % runtime->rate) * runtime->period_size) / runtime->rate; return usecs; } static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state) { snd_pcm_stream_lock_irq(substream); if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED) substream->runtime->status->state = state; snd_pcm_stream_unlock_irq(substream); } static inline void snd_pcm_timer_notify(struct snd_pcm_substream *substream, int event) { #ifdef CONFIG_SND_PCM_TIMER if (substream->timer) snd_timer_notify(substream->timer, event, &substream->runtime->trigger_tstamp); #endif } static int snd_pcm_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params) { struct snd_pcm_runtime *runtime; int err, usecs; unsigned int bits; snd_pcm_uframes_t frames; if (PCM_RUNTIME_CHECK(substream)) return -ENXIO; runtime = substream->runtime; snd_pcm_stream_lock_irq(substream); switch (runtime->status->state) { case SNDRV_PCM_STATE_OPEN: case SNDRV_PCM_STATE_SETUP: case SNDRV_PCM_STATE_PREPARED: break; default: snd_pcm_stream_unlock_irq(substream); return -EBADFD; } snd_pcm_stream_unlock_irq(substream); #if IS_ENABLED(CONFIG_SND_PCM_OSS) if (!substream->oss.oss) #endif if (atomic_read(&substream->mmap_count)) return -EBADFD; params->rmask = ~0U; err = snd_pcm_hw_refine(substream, params); if (err < 0) goto _error; err = snd_pcm_hw_params_choose(substream, params); if (err < 0) goto _error; if (substream->ops->hw_params != NULL) { err = substream->ops->hw_params(substream, params); if (err < 0) goto _error; } runtime->access = params_access(params); runtime->format = params_format(params); runtime->subformat = params_subformat(params); runtime->channels = params_channels(params); runtime->rate = params_rate(params); runtime->period_size = params_period_size(params); runtime->periods = params_periods(params); runtime->buffer_size = params_buffer_size(params); runtime->info = params->info; runtime->rate_num = params->rate_num; runtime->rate_den = params->rate_den; runtime->no_period_wakeup = (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) && (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP); bits = snd_pcm_format_physical_width(runtime->format); runtime->sample_bits = bits; bits *= runtime->channels; runtime->frame_bits = bits; frames = 1; while (bits % 8 != 0) { bits *= 2; frames *= 2; } runtime->byte_align = bits / 8; runtime->min_align = frames; /* Default sw params */ runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE; runtime->period_step = 1; runtime->control->avail_min = runtime->period_size; runtime->start_threshold = 1; runtime->stop_threshold = runtime->buffer_size; runtime->silence_threshold = 0; runtime->silence_size = 0; runtime->boundary = runtime->buffer_size; while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size) runtime->boundary *= 2; /* clear the buffer for avoiding possible kernel info leaks */ if (runtime->dma_area && !substream->ops->copy) memset(runtime->dma_area, 0, runtime->dma_bytes); snd_pcm_timer_resolution_change(substream); snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP); if (pm_qos_request_active(&substream->latency_pm_qos_req)) pm_qos_remove_request(&substream->latency_pm_qos_req); if ((usecs = period_to_usecs(runtime)) >= 0) pm_qos_add_request(&substream->latency_pm_qos_req, PM_QOS_CPU_DMA_LATENCY, usecs); return 0; _error: /* hardware might be unusable from this time, so we force application to retry to set the correct hardware parameter settings */ snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); if (substream->ops->hw_free != NULL) substream->ops->hw_free(substream); return err; } static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream, struct snd_pcm_hw_params __user * _params) { struct snd_pcm_hw_params *params; int err; params = memdup_user(_params, sizeof(*params)); if (IS_ERR(params)) return PTR_ERR(params); err = snd_pcm_hw_params(substream, params); if (copy_to_user(_params, params, sizeof(*params))) { if (!err) err = -EFAULT; } kfree(params); return err; } static int snd_pcm_hw_free(struct snd_pcm_substream *substream) { struct snd_pcm_runtime *runtime; int result = 0; if (PCM_RUNTIME_CHECK(substream)) return -ENXIO; runtime = substream->runtime; snd_pcm_stream_lock_irq(substream); switch (runtime->status->state) { case SNDRV_PCM_STATE_SETUP: case SNDRV_PCM_STATE_PREPARED: break; default: snd_pcm_stream_unlock_irq(substream); return -EBADFD; } snd_pcm_stream_unlock_irq(substream); if (atomic_read(&substream->mmap_count)) return -EBADFD; if (substream->ops->hw_free) result = substream->ops->hw_free(substream); snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); pm_qos_remove_request(&substream->latency_pm_qos_req); return result; } static int snd_pcm_sw_params(struct snd_pcm_substream *substream, struct snd_pcm_sw_params *params) { struct snd_pcm_runtime *runtime; int err; if (PCM_RUNTIME_CHECK(substream)) return -ENXIO; runtime = substream->runtime; snd_pcm_stream_lock_irq(substream); if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { snd_pcm_stream_unlock_irq(substream); return -EBADFD; } snd_pcm_stream_unlock_irq(substream); if (params->tstamp_mode < 0 || params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST) return -EINVAL; if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) && params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST) return -EINVAL; if (params->avail_min == 0) return -EINVAL; if (params->silence_size >= runtime->boundary) { if (params->silence_threshold != 0) return -EINVAL; } else { if (params->silence_size > params->silence_threshold) return -EINVAL; if (params->silence_threshold > runtime->buffer_size) return -EINVAL; } err = 0; snd_pcm_stream_lock_irq(substream); runtime->tstamp_mode = params->tstamp_mode; if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12)) runtime->tstamp_type = params->tstamp_type; runtime->period_step = params->period_step; runtime->control->avail_min = params->avail_min; runtime->start_threshold = params->start_threshold; runtime->stop_threshold = params->stop_threshold; runtime->silence_threshold = params->silence_threshold; runtime->silence_size = params->silence_size; params->boundary = runtime->boundary; if (snd_pcm_running(substream)) { if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && runtime->silence_size > 0) snd_pcm_playback_silence(substream, ULONG_MAX); err = snd_pcm_update_state(substream, runtime); } snd_pcm_stream_unlock_irq(substream); return err; } static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream, struct snd_pcm_sw_params __user * _params) { struct snd_pcm_sw_params params; int err; if (copy_from_user(¶ms, _params, sizeof(params))) return -EFAULT; err = snd_pcm_sw_params(substream, ¶ms); if (copy_to_user(_params, ¶ms, sizeof(params))) return -EFAULT; return err; } int snd_pcm_status(struct snd_pcm_substream *substream, struct snd_pcm_status *status) { struct snd_pcm_runtime *runtime = substream->runtime; snd_pcm_stream_lock_irq(substream); snd_pcm_unpack_audio_tstamp_config(status->audio_tstamp_data, &runtime->audio_tstamp_config); /* backwards compatible behavior */ if (runtime->audio_tstamp_config.type_requested == SNDRV_PCM_AUDIO_TSTAMP_TYPE_COMPAT) { if (runtime->hw.info & SNDRV_PCM_INFO_HAS_WALL_CLOCK) runtime->audio_tstamp_config.type_requested = SNDRV_PCM_AUDIO_TSTAMP_TYPE_LINK; else runtime->audio_tstamp_config.type_requested = SNDRV_PCM_AUDIO_TSTAMP_TYPE_DEFAULT; runtime->audio_tstamp_report.valid = 0; } else runtime->audio_tstamp_report.valid = 1; status->state = runtime->status->state; status->suspended_state = runtime->status->suspended_state; if (status->state == SNDRV_PCM_STATE_OPEN) goto _end; status->trigger_tstamp = runtime->trigger_tstamp; if (snd_pcm_running(substream)) { snd_pcm_update_hw_ptr(substream); if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) { status->tstamp = runtime->status->tstamp; status->driver_tstamp = runtime->driver_tstamp; status->audio_tstamp = runtime->status->audio_tstamp; if (runtime->audio_tstamp_report.valid == 1) /* backwards compatibility, no report provided in COMPAT mode */ snd_pcm_pack_audio_tstamp_report(&status->audio_tstamp_data, &status->audio_tstamp_accuracy, &runtime->audio_tstamp_report); goto _tstamp_end; } } else { /* get tstamp only in fallback mode and only if enabled */ if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) snd_pcm_gettime(runtime, &status->tstamp); } _tstamp_end: status->appl_ptr = runtime->control->appl_ptr; status->hw_ptr = runtime->status->hw_ptr; if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { status->avail = snd_pcm_playback_avail(runtime); if (runtime->status->state == SNDRV_PCM_STATE_RUNNING || runtime->status->state == SNDRV_PCM_STATE_DRAINING) { status->delay = runtime->buffer_size - status->avail; status->delay += runtime->delay; } else status->delay = 0; } else { status->avail = snd_pcm_capture_avail(runtime); if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) status->delay = status->avail + runtime->delay; else status->delay = 0; } status->avail_max = runtime->avail_max; status->overrange = runtime->overrange; runtime->avail_max = 0; runtime->overrange = 0; _end: snd_pcm_stream_unlock_irq(substream); return 0; } static int snd_pcm_status_user(struct snd_pcm_substream *substream, struct snd_pcm_status __user * _status, bool ext) { struct snd_pcm_status status; int res; memset(&status, 0, sizeof(status)); /* * with extension, parameters are read/write, * get audio_tstamp_data from user, * ignore rest of status structure */ if (ext && get_user(status.audio_tstamp_data, (u32 __user *)(&_status->audio_tstamp_data))) return -EFAULT; res = snd_pcm_status(substream, &status); if (res < 0) return res; if (copy_to_user(_status, &status, sizeof(status))) return -EFAULT; return 0; } static int snd_pcm_channel_info(struct snd_pcm_substream *substream, struct snd_pcm_channel_info * info) { struct snd_pcm_runtime *runtime; unsigned int channel; channel = info->channel; runtime = substream->runtime; snd_pcm_stream_lock_irq(substream); if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { snd_pcm_stream_unlock_irq(substream); return -EBADFD; } snd_pcm_stream_unlock_irq(substream); if (channel >= runtime->channels) return -EINVAL; memset(info, 0, sizeof(*info)); info->channel = channel; return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info); } static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream, struct snd_pcm_channel_info __user * _info) { struct snd_pcm_channel_info info; int res; if (copy_from_user(&info, _info, sizeof(info))) return -EFAULT; res = snd_pcm_channel_info(substream, &info); if (res < 0) return res; if (copy_to_user(_info, &info, sizeof(info))) return -EFAULT; return 0; } static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream) { struct snd_pcm_runtime *runtime = substream->runtime; if (runtime->trigger_master == NULL) return; if (runtime->trigger_master == substream) { if (!runtime->trigger_tstamp_latched) snd_pcm_gettime(runtime, &runtime->trigger_tstamp); } else { snd_pcm_trigger_tstamp(runtime->trigger_master); runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp; } runtime->trigger_master = NULL; } struct action_ops { int (*pre_action)(struct snd_pcm_substream *substream, int state); int (*do_action)(struct snd_pcm_substream *substream, int state); void (*undo_action)(struct snd_pcm_substream *substream, int state); void (*post_action)(struct snd_pcm_substream *substream, int state); }; /* * this functions is core for handling of linked stream * Note: the stream state might be changed also on failure * Note2: call with calling stream lock + link lock */ static int snd_pcm_action_group(const struct action_ops *ops, struct snd_pcm_substream *substream, int state, int do_lock) { struct snd_pcm_substream *s = NULL; struct snd_pcm_substream *s1; int res = 0, depth = 1; snd_pcm_group_for_each_entry(s, substream) { if (do_lock && s != substream) { if (s->pcm->nonatomic) mutex_lock_nested(&s->self_group.mutex, depth); else spin_lock_nested(&s->self_group.lock, depth); depth++; } res = ops->pre_action(s, state); if (res < 0) goto _unlock; } snd_pcm_group_for_each_entry(s, substream) { res = ops->do_action(s, state); if (res < 0) { if (ops->undo_action) { snd_pcm_group_for_each_entry(s1, substream) { if (s1 == s) /* failed stream */ break; ops->undo_action(s1, state); } } s = NULL; /* unlock all */ goto _unlock; } } snd_pcm_group_for_each_entry(s, substream) { ops->post_action(s, state); } _unlock: if (do_lock) { /* unlock streams */ snd_pcm_group_for_each_entry(s1, substream) { if (s1 != substream) { if (s1->pcm->nonatomic) mutex_unlock(&s1->self_group.mutex); else spin_unlock(&s1->self_group.lock); } if (s1 == s) /* end */ break; } } return res; } /* * Note: call with stream lock */ static int snd_pcm_action_single(const struct action_ops *ops, struct snd_pcm_substream *substream, int state) { int res; res = ops->pre_action(substream, state); if (res < 0) return res; res = ops->do_action(substream, state); if (res == 0) ops->post_action(substream, state); else if (ops->undo_action) ops->undo_action(substream, state); return res; } /* * Note: call with stream lock */ static int snd_pcm_action(const struct action_ops *ops, struct snd_pcm_substream *substream, int state) { int res; if (!snd_pcm_stream_linked(substream)) return snd_pcm_action_single(ops, substream, state); if (substream->pcm->nonatomic) { if (!mutex_trylock(&substream->group->mutex)) { mutex_unlock(&substream->self_group.mutex); mutex_lock(&substream->group->mutex); mutex_lock(&substream->self_group.mutex); } res = snd_pcm_action_group(ops, substream, state, 1); mutex_unlock(&substream->group->mutex); } else { if (!spin_trylock(&substream->group->lock)) { spin_unlock(&substream->self_group.lock); spin_lock(&substream->group->lock); spin_lock(&substream->self_group.lock); } res = snd_pcm_action_group(ops, substream, state, 1); spin_unlock(&substream->group->lock); } return res; } /* * Note: don't use any locks before */ static int snd_pcm_action_lock_irq(const struct action_ops *ops, struct snd_pcm_substream *substream, int state) { int res; snd_pcm_stream_lock_irq(substream); res = snd_pcm_action(ops, substream, state); snd_pcm_stream_unlock_irq(substream); return res; } /* */ static int snd_pcm_action_nonatomic(const struct action_ops *ops, struct snd_pcm_substream *substream, int state) { int res; down_read(&snd_pcm_link_rwsem); if (snd_pcm_stream_linked(substream)) res = snd_pcm_action_group(ops, substream, state, 0); else res = snd_pcm_action_single(ops, substream, state); up_read(&snd_pcm_link_rwsem); return res; } /* * start callbacks */ static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state) { struct snd_pcm_runtime *runtime = substream->runtime; if (runtime->status->state != SNDRV_PCM_STATE_PREPARED) return -EBADFD; if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && !snd_pcm_playback_data(substream)) return -EPIPE; runtime->trigger_tstamp_latched = false; runtime->trigger_master = substream; return 0; } static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state) { if (substream->runtime->trigger_master != substream) return 0; return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START); } static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state) { if (substream->runtime->trigger_master == substream) substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); } static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state) { struct snd_pcm_runtime *runtime = substream->runtime; snd_pcm_trigger_tstamp(substream); runtime->hw_ptr_jiffies = jiffies; runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) / runtime->rate; runtime->status->state = state; if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && runtime->silence_size > 0) snd_pcm_playback_silence(substream, ULONG_MAX); snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTART); } static const struct action_ops snd_pcm_action_start = { .pre_action = snd_pcm_pre_start, .do_action = snd_pcm_do_start, .undo_action = snd_pcm_undo_start, .post_action = snd_pcm_post_start }; /** * snd_pcm_start - start all linked streams * @substream: the PCM substream instance * * Return: Zero if successful, or a negative error code. */ int snd_pcm_start(struct snd_pcm_substream *substream) { return snd_pcm_action(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING); } /* * stop callbacks */ static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state) { struct snd_pcm_runtime *runtime = substream->runtime; if (runtime->status->state == SNDRV_PCM_STATE_OPEN) return -EBADFD; runtime->trigger_master = substream; return 0; } static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state) { if (substream->runtime->trigger_master == substream && snd_pcm_running(substream)) substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); return 0; /* unconditonally stop all substreams */ } static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state) { struct snd_pcm_runtime *runtime = substream->runtime; if (runtime->status->state != state) { snd_pcm_trigger_tstamp(substream); runtime->status->state = state; snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP); } wake_up(&runtime->sleep); wake_up(&runtime->tsleep); } static const struct action_ops snd_pcm_action_stop = { .pre_action = snd_pcm_pre_stop, .do_action = snd_pcm_do_stop, .post_action = snd_pcm_post_stop }; /** * snd_pcm_stop - try to stop all running streams in the substream group * @substream: the PCM substream instance * @state: PCM state after stopping the stream * * The state of each stream is then changed to the given state unconditionally. * * Return: Zero if successful, or a negative error code. */ int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state) { return snd_pcm_action(&snd_pcm_action_stop, substream, state); } EXPORT_SYMBOL(snd_pcm_stop); /** * snd_pcm_drain_done - stop the DMA only when the given stream is playback * @substream: the PCM substream * * After stopping, the state is changed to SETUP. * Unlike snd_pcm_stop(), this affects only the given stream. * * Return: Zero if succesful, or a negative error code. */ int snd_pcm_drain_done(struct snd_pcm_substream *substream) { return snd_pcm_action_single(&snd_pcm_action_stop, substream, SNDRV_PCM_STATE_SETUP); } /** * snd_pcm_stop_xrun - stop the running streams as XRUN * @substream: the PCM substream instance * * This stops the given running substream (and all linked substreams) as XRUN. * Unlike snd_pcm_stop(), this function takes the substream lock by itself. * * Return: Zero if successful, or a negative error code. */ int snd_pcm_stop_xrun(struct snd_pcm_substream *substream) { unsigned long flags; int ret = 0; snd_pcm_stream_lock_irqsave(substream, flags); if (snd_pcm_running(substream)) ret = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); snd_pcm_stream_unlock_irqrestore(substream, flags); return ret; } EXPORT_SYMBOL_GPL(snd_pcm_stop_xrun); /* * pause callbacks */ static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push) { struct snd_pcm_runtime *runtime = substream->runtime; if (!(runtime->info & SNDRV_PCM_INFO_PAUSE)) return -ENOSYS; if (push) { if (runtime->status->state != SNDRV_PCM_STATE_RUNNING) return -EBADFD; } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED) return -EBADFD; runtime->trigger_master = substream; return 0; } static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push) { if (substream->runtime->trigger_master != substream) return 0; /* some drivers might use hw_ptr to recover from the pause - update the hw_ptr now */ if (push) snd_pcm_update_hw_ptr(substream); /* The jiffies check in snd_pcm_update_hw_ptr*() is done by * a delta between the current jiffies, this gives a large enough * delta, effectively to skip the check once. */ substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000; return substream->ops->trigger(substream, push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH : SNDRV_PCM_TRIGGER_PAUSE_RELEASE); } static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push) { if (substream->runtime->trigger_master == substream) substream->ops->trigger(substream, push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE : SNDRV_PCM_TRIGGER_PAUSE_PUSH); } static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push) { struct snd_pcm_runtime *runtime = substream->runtime; snd_pcm_trigger_tstamp(substream); if (push) { runtime->status->state = SNDRV_PCM_STATE_PAUSED; snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE); wake_up(&runtime->sleep); wake_up(&runtime->tsleep); } else { runtime->status->state = SNDRV_PCM_STATE_RUNNING; snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MCONTINUE); } } static const struct action_ops snd_pcm_action_pause = { .pre_action = snd_pcm_pre_pause, .do_action = snd_pcm_do_pause, .undo_action = snd_pcm_undo_pause, .post_action = snd_pcm_post_pause }; /* * Push/release the pause for all linked streams. */ static int snd_pcm_pause(struct snd_pcm_substream *substream, int push) { return snd_pcm_action(&snd_pcm_action_pause, substream, push); } #ifdef CONFIG_PM /* suspend */ static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state) { struct snd_pcm_runtime *runtime = substream->runtime; switch (runtime->status->state) { case SNDRV_PCM_STATE_SUSPENDED: return -EBUSY; /* unresumable PCM state; return -EBUSY for skipping suspend */ case SNDRV_PCM_STATE_OPEN: case SNDRV_PCM_STATE_SETUP: case SNDRV_PCM_STATE_DISCONNECTED: return -EBUSY; } runtime->trigger_master = substream; return 0; } static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state) { struct snd_pcm_runtime *runtime = substream->runtime; if (runtime->trigger_master != substream) return 0; if (! snd_pcm_running(substream)) return 0; substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); return 0; /* suspend unconditionally */ } static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state) { struct snd_pcm_runtime *runtime = substream->runtime; snd_pcm_trigger_tstamp(substream); runtime->status->suspended_state = runtime->status->state; runtime->status->state = SNDRV_PCM_STATE_SUSPENDED; snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSUSPEND); wake_up(&runtime->sleep); wake_up(&runtime->tsleep); } static const struct action_ops snd_pcm_action_suspend = { .pre_action = snd_pcm_pre_suspend, .do_action = snd_pcm_do_suspend, .post_action = snd_pcm_post_suspend }; /** * snd_pcm_suspend - trigger SUSPEND to all linked streams * @substream: the PCM substream * * After this call, all streams are changed to SUSPENDED state. * * Return: Zero if successful (or @substream is %NULL), or a negative error * code. */ int snd_pcm_suspend(struct snd_pcm_substream *substream) { int err; unsigned long flags; if (! substream) return 0; snd_pcm_stream_lock_irqsave(substream, flags); err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0); snd_pcm_stream_unlock_irqrestore(substream, flags); return err; } EXPORT_SYMBOL(snd_pcm_suspend); /** * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm * @pcm: the PCM instance * * After this call, all streams are changed to SUSPENDED state. * * Return: Zero if successful (or @pcm is %NULL), or a negative error code. */ int snd_pcm_suspend_all(struct snd_pcm *pcm) { struct snd_pcm_substream *substream; int stream, err = 0; if (! pcm) return 0; for (stream = 0; stream < 2; stream++) { for (substream = pcm->streams[stream].substream; substream; substream = substream->next) { /* FIXME: the open/close code should lock this as well */ if (substream->runtime == NULL) continue; /* * Skip BE dai link PCM's that are internal and may * not have their substream ops set. */ if (!substream->ops) continue; err = snd_pcm_suspend(substream); if (err < 0 && err != -EBUSY) return err; } } return 0; } EXPORT_SYMBOL(snd_pcm_suspend_all); /* resume */ static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state) { struct snd_pcm_runtime *runtime = substream->runtime; if (!(runtime->info & SNDRV_PCM_INFO_RESUME)) return -ENOSYS; runtime->trigger_master = substream; return 0; } static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state) { struct snd_pcm_runtime *runtime = substream->runtime; if (runtime->trigger_master != substream) return 0; /* DMA not running previously? */ if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING && (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING || substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) return 0; return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME); } static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state) { if (substream->runtime->trigger_master == substream && snd_pcm_running(substream)) substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); } static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state) { struct snd_pcm_runtime *runtime = substream->runtime; snd_pcm_trigger_tstamp(substream); runtime->status->state = runtime->status->suspended_state; snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME); } static const struct action_ops snd_pcm_action_resume = { .pre_action = snd_pcm_pre_resume, .do_action = snd_pcm_do_resume, .undo_action = snd_pcm_undo_resume, .post_action = snd_pcm_post_resume }; static int snd_pcm_resume(struct snd_pcm_substream *substream) { struct snd_card *card = substream->pcm->card; int res; snd_power_lock(card); if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0) res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0); snd_power_unlock(card); return res; } #else static int snd_pcm_resume(struct snd_pcm_substream *substream) { return -ENOSYS; } #endif /* CONFIG_PM */ /* * xrun ioctl * * Change the RUNNING stream(s) to XRUN state. */ static int snd_pcm_xrun(struct snd_pcm_substream *substream) { struct snd_card *card = substream->pcm->card; struct snd_pcm_runtime *runtime = substream->runtime; int result; snd_power_lock(card); if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) { result = snd_power_wait(card, SNDRV_CTL_POWER_D0); if (result < 0) goto _unlock; } snd_pcm_stream_lock_irq(substream); switch (runtime->status->state) { case SNDRV_PCM_STATE_XRUN: result = 0; /* already there */ break; case SNDRV_PCM_STATE_RUNNING: result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); break; default: result = -EBADFD; } snd_pcm_stream_unlock_irq(substream); _unlock: snd_power_unlock(card); return result; } /* * reset ioctl */ static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state) { struct snd_pcm_runtime *runtime = substream->runtime; switch (runtime->status->state) { case SNDRV_PCM_STATE_RUNNING: case SNDRV_PCM_STATE_PREPARED: case SNDRV_PCM_STATE_PAUSED: case SNDRV_PCM_STATE_SUSPENDED: return 0; default: return -EBADFD; } } static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state) { struct snd_pcm_runtime *runtime = substream->runtime; int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL); if (err < 0) return err; runtime->hw_ptr_base = 0; runtime->hw_ptr_interrupt = runtime->status->hw_ptr - runtime->status->hw_ptr % runtime->period_size; runtime->silence_start = runtime->status->hw_ptr; runtime->silence_filled = 0; return 0; } static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state) { struct snd_pcm_runtime *runtime = substream->runtime; runtime->control->appl_ptr = runtime->status->hw_ptr; if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && runtime->silence_size > 0) snd_pcm_playback_silence(substream, ULONG_MAX); } static const struct action_ops snd_pcm_action_reset = { .pre_action = snd_pcm_pre_reset, .do_action = snd_pcm_do_reset, .post_action = snd_pcm_post_reset }; static int snd_pcm_reset(struct snd_pcm_substream *substream) { return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0); } /* * prepare ioctl */ /* we use the second argument for updating f_flags */ static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream, int f_flags) { struct snd_pcm_runtime *runtime = substream->runtime; if (runtime->status->state == SNDRV_PCM_STATE_OPEN || runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) return -EBADFD; if (snd_pcm_running(substream)) return -EBUSY; substream->f_flags = f_flags; return 0; } static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state) { int err; err = substream->ops->prepare(substream); if (err < 0) return err; return snd_pcm_do_reset(substream, 0); } static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state) { struct snd_pcm_runtime *runtime = substream->runtime; runtime->control->appl_ptr = runtime->status->hw_ptr; snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED); } static const struct action_ops snd_pcm_action_prepare = { .pre_action = snd_pcm_pre_prepare, .do_action = snd_pcm_do_prepare, .post_action = snd_pcm_post_prepare }; /** * snd_pcm_prepare - prepare the PCM substream to be triggerable * @substream: the PCM substream instance * @file: file to refer f_flags * * Return: Zero if successful, or a negative error code. */ static int snd_pcm_prepare(struct snd_pcm_substream *substream, struct file *file) { int res; struct snd_card *card = substream->pcm->card; int f_flags; if (file) f_flags = file->f_flags; else f_flags = substream->f_flags; snd_power_lock(card); if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0) res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare, substream, f_flags); snd_power_unlock(card); return res; } /* * drain ioctl */ static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state) { struct snd_pcm_runtime *runtime = substream->runtime; switch (runtime->status->state) { case SNDRV_PCM_STATE_OPEN: case SNDRV_PCM_STATE_DISCONNECTED: case SNDRV_PCM_STATE_SUSPENDED: return -EBADFD; } runtime->trigger_master = substream; return 0; } static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state) { struct snd_pcm_runtime *runtime = substream->runtime; struct snd_pcm_substream *trigger_master = runtime->trigger_master; if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { switch (runtime->status->state) { case SNDRV_PCM_STATE_PREPARED: /* start playback stream if possible */ if (! snd_pcm_playback_empty(substream)) { snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING); snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING); } else { runtime->status->state = SNDRV_PCM_STATE_SETUP; } break; case SNDRV_PCM_STATE_RUNNING: runtime->status->state = SNDRV_PCM_STATE_DRAINING; break; case SNDRV_PCM_STATE_XRUN: runtime->status->state = SNDRV_PCM_STATE_SETUP; break; default: break; } } else { /* stop running stream */ if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) { int new_state = snd_pcm_capture_avail(runtime) > 0 ? SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP; snd_pcm_do_stop(substream, new_state); snd_pcm_post_stop(substream, new_state); } } /* trigger_master would be cleared if the control */ /* entered snd_pcm_post_start or snd_pcm_post_stop, */ /* hence it has to be restored */ runtime->trigger_master = trigger_master; if (runtime->status->state == SNDRV_PCM_STATE_DRAINING && runtime->trigger_master == substream && (runtime->hw.info & SNDRV_PCM_INFO_DRAIN_TRIGGER)) return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_DRAIN); return 0; } static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state) { } static const struct action_ops snd_pcm_action_drain_init = { .pre_action = snd_pcm_pre_drain_init, .do_action = snd_pcm_do_drain_init, .post_action = snd_pcm_post_drain_init }; static int snd_pcm_drop(struct snd_pcm_substream *substream); /* * Drain the stream(s). * When the substream is linked, sync until the draining of all playback streams * is finished. * After this call, all streams are supposed to be either SETUP or DRAINING * (capture only) state. */ static int snd_pcm_drain(struct snd_pcm_substream *substream, struct file *file) { struct snd_card *card; struct snd_pcm_runtime *runtime; struct snd_pcm_substream *s; wait_queue_t wait; int result = 0; int nonblock = 0; card = substream->pcm->card; runtime = substream->runtime; if (runtime->status->state == SNDRV_PCM_STATE_OPEN) return -EBADFD; snd_power_lock(card); if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) { result = snd_power_wait(card, SNDRV_CTL_POWER_D0); if (result < 0) { snd_power_unlock(card); return result; } } if (file) { if (file->f_flags & O_NONBLOCK) nonblock = 1; } else if (substream->f_flags & O_NONBLOCK) nonblock = 1; down_read(&snd_pcm_link_rwsem); snd_pcm_stream_lock_irq(substream); /* resume pause */ if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) snd_pcm_pause(substream, 0); /* pre-start/stop - all running streams are changed to DRAINING state */ result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0); if (result < 0) goto unlock; /* in non-blocking, we don't wait in ioctl but let caller poll */ if (nonblock) { result = -EAGAIN; goto unlock; } for (;;) { long tout; struct snd_pcm_runtime *to_check; if (signal_pending(current)) { result = -ERESTARTSYS; break; } /* find a substream to drain */ to_check = NULL; snd_pcm_group_for_each_entry(s, substream) { if (s->stream != SNDRV_PCM_STREAM_PLAYBACK) continue; runtime = s->runtime; if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) { to_check = runtime; break; } } if (!to_check) break; /* all drained */ init_waitqueue_entry(&wait, current); add_wait_queue(&to_check->sleep, &wait); snd_pcm_stream_unlock_irq(substream); up_read(&snd_pcm_link_rwsem); snd_power_unlock(card); if (runtime->no_period_wakeup) tout = MAX_SCHEDULE_TIMEOUT; else { tout = 10; if (runtime->rate) { long t = runtime->period_size * 2 / runtime->rate; tout = max(t, tout); } tout = msecs_to_jiffies(tout * 1000); } tout = schedule_timeout_interruptible(tout); snd_power_lock(card); down_read(&snd_pcm_link_rwsem); snd_pcm_stream_lock_irq(substream); remove_wait_queue(&to_check->sleep, &wait); if (card->shutdown) { result = -ENODEV; break; } if (tout == 0) { if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) result = -ESTRPIPE; else { dev_dbg(substream->pcm->card->dev, "playback drain error (DMA or IRQ trouble?)\n"); snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); result = -EIO; } break; } } unlock: snd_pcm_stream_unlock_irq(substream); up_read(&snd_pcm_link_rwsem); snd_power_unlock(card); return result; } /* * drop ioctl * * Immediately put all linked substreams into SETUP state. */ static int snd_pcm_drop(struct snd_pcm_substream *substream) { struct snd_pcm_runtime *runtime; int result = 0; if (PCM_RUNTIME_CHECK(substream)) return -ENXIO; runtime = substream->runtime; if (runtime->status->state == SNDRV_PCM_STATE_OPEN || runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED || runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) return -EBADFD; snd_pcm_stream_lock_irq(substream); /* resume pause */ if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) snd_pcm_pause(substream, 0); snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); /* runtime->control->appl_ptr = runtime->status->hw_ptr; */ snd_pcm_stream_unlock_irq(substream); return result; } static bool is_pcm_file(struct file *file) { struct inode *inode = file_inode(file); unsigned int minor; if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major) return false; minor = iminor(inode); return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) || snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE); } /* * PCM link handling */ static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) { int res = 0; struct snd_pcm_file *pcm_file; struct snd_pcm_substream *substream1; struct snd_pcm_group *group; struct fd f = fdget(fd); if (!f.file) return -EBADFD; if (!is_pcm_file(f.file)) { res = -EBADFD; goto _badf; } pcm_file = f.file->private_data; substream1 = pcm_file->substream; if (substream == substream1) { res = -EINVAL; goto _badf; } group = kmalloc(sizeof(*group), GFP_KERNEL); if (!group) { res = -ENOMEM; goto _nolock; } down_write_nonfifo(&snd_pcm_link_rwsem); write_lock_irq(&snd_pcm_link_rwlock); if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN || substream->runtime->status->state != substream1->runtime->status->state || substream->pcm->nonatomic != substream1->pcm->nonatomic) { res = -EBADFD; goto _end; } if (snd_pcm_stream_linked(substream1)) { res = -EALREADY; goto _end; } if (!snd_pcm_stream_linked(substream)) { substream->group = group; group = NULL; spin_lock_init(&substream->group->lock); mutex_init(&substream->group->mutex); INIT_LIST_HEAD(&substream->group->substreams); list_add_tail(&substream->link_list, &substream->group->substreams); substream->group->count = 1; } list_add_tail(&substream1->link_list, &substream->group->substreams); substream->group->count++; substream1->group = substream->group; _end: write_unlock_irq(&snd_pcm_link_rwlock); up_write(&snd_pcm_link_rwsem); _nolock: snd_card_unref(substream1->pcm->card); kfree(group); _badf: fdput(f); return res; } static void relink_to_local(struct snd_pcm_substream *substream) { substream->group = &substream->self_group; INIT_LIST_HEAD(&substream->self_group.substreams); list_add_tail(&substream->link_list, &substream->self_group.substreams); } static int snd_pcm_unlink(struct snd_pcm_substream *substream) { struct snd_pcm_substream *s; int res = 0; down_write_nonfifo(&snd_pcm_link_rwsem); write_lock_irq(&snd_pcm_link_rwlock); if (!snd_pcm_stream_linked(substream)) { res = -EALREADY; goto _end; } list_del(&substream->link_list); substream->group->count--; if (substream->group->count == 1) { /* detach the last stream, too */ snd_pcm_group_for_each_entry(s, substream) { relink_to_local(s); break; } kfree(substream->group); } relink_to_local(substream); _end: write_unlock_irq(&snd_pcm_link_rwlock); up_write(&snd_pcm_link_rwsem); return res; } /* * hw configurator */ static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule) { struct snd_interval t; snd_interval_mul(hw_param_interval_c(params, rule->deps[0]), hw_param_interval_c(params, rule->deps[1]), &t); return snd_interval_refine(hw_param_interval(params, rule->var), &t); } static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule) { struct snd_interval t; snd_interval_div(hw_param_interval_c(params, rule->deps[0]), hw_param_interval_c(params, rule->deps[1]), &t); return snd_interval_refine(hw_param_interval(params, rule->var), &t); } static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule) { struct snd_interval t; snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]), hw_param_interval_c(params, rule->deps[1]), (unsigned long) rule->private, &t); return snd_interval_refine(hw_param_interval(params, rule->var), &t); } static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule) { struct snd_interval t; snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]), (unsigned long) rule->private, hw_param_interval_c(params, rule->deps[1]), &t); return snd_interval_refine(hw_param_interval(params, rule->var), &t); } static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule) { unsigned int k; struct snd_interval *i = hw_param_interval(params, rule->deps[0]); struct snd_mask m; struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); snd_mask_any(&m); for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { int bits; if (! snd_mask_test(mask, k)) continue; bits = snd_pcm_format_physical_width(k); if (bits <= 0) continue; /* ignore invalid formats */ if ((unsigned)bits < i->min || (unsigned)bits > i->max) snd_mask_reset(&m, k); } return snd_mask_refine(mask, &m); } static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule) { struct snd_interval t; unsigned int k; t.min = UINT_MAX; t.max = 0; t.openmin = 0; t.openmax = 0; for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { int bits; if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k)) continue; bits = snd_pcm_format_physical_width(k); if (bits <= 0) continue; /* ignore invalid formats */ if (t.min > (unsigned)bits) t.min = bits; if (t.max < (unsigned)bits) t.max = bits; } t.integer = 1; return snd_interval_refine(hw_param_interval(params, rule->var), &t); } #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 #error "Change this table" #endif static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100, 48000, 64000, 88200, 96000, 176400, 192000 }; const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = { .count = ARRAY_SIZE(rates), .list = rates, }; static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule) { struct snd_pcm_hardware *hw = rule->private; return snd_interval_list(hw_param_interval(params, rule->var), snd_pcm_known_rates.count, snd_pcm_known_rates.list, hw->rates); } static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule) { struct snd_interval t; struct snd_pcm_substream *substream = rule->private; t.min = 0; t.max = substream->buffer_bytes_max; t.openmin = 0; t.openmax = 0; t.integer = 1; return snd_interval_refine(hw_param_interval(params, rule->var), &t); } int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream) { struct snd_pcm_runtime *runtime = substream->runtime; struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; int k, err; for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { snd_mask_any(constrs_mask(constrs, k)); } for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { snd_interval_any(constrs_interval(constrs, k)); } snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS)); snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)); snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)); snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)); snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS)); err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, snd_pcm_hw_rule_format, NULL, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); if (err < 0) return err; err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, snd_pcm_hw_rule_sample_bits, NULL, SNDRV_PCM_HW_PARAM_FORMAT, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); if (err < 0) return err; err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, snd_pcm_hw_rule_div, NULL, SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); if (err < 0) return err; err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, snd_pcm_hw_rule_mul, NULL, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); if (err < 0) return err; err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, snd_pcm_hw_rule_mulkdiv, (void*) 8, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); if (err < 0) return err; err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, snd_pcm_hw_rule_mulkdiv, (void*) 8, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); if (err < 0) return err; err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, snd_pcm_hw_rule_div, NULL, SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); if (err < 0) return err; err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, snd_pcm_hw_rule_mulkdiv, (void*) 1000000, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1); if (err < 0) return err; err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, snd_pcm_hw_rule_mulkdiv, (void*) 1000000, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1); if (err < 0) return err; err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, snd_pcm_hw_rule_div, NULL, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); if (err < 0) return err; err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, snd_pcm_hw_rule_div, NULL, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); if (err < 0) return err; err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, snd_pcm_hw_rule_mulkdiv, (void*) 8, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); if (err < 0) return err; err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, snd_pcm_hw_rule_muldivk, (void*) 1000000, SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); if (err < 0) return err; err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, snd_pcm_hw_rule_mul, NULL, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); if (err < 0) return err; err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, snd_pcm_hw_rule_mulkdiv, (void*) 8, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); if (err < 0) return err; err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, snd_pcm_hw_rule_muldivk, (void*) 1000000, SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); if (err < 0) return err; err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, snd_pcm_hw_rule_muldivk, (void*) 8, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); if (err < 0) return err; err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, snd_pcm_hw_rule_muldivk, (void*) 8, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); if (err < 0) return err; err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, snd_pcm_hw_rule_mulkdiv, (void*) 1000000, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); if (err < 0) return err; err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, snd_pcm_hw_rule_mulkdiv, (void*) 1000000, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); if (err < 0) return err; return 0; } int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream) { struct snd_pcm_runtime *runtime = substream->runtime; struct snd_pcm_hardware *hw = &runtime->hw; int err; unsigned int mask = 0; if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED; if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED; if (hw_support_mmap(substream)) { if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED; if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED; if (hw->info & SNDRV_PCM_INFO_COMPLEX) mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX; } err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask); if (err < 0) return err; err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats); if (err < 0) return err; err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD); if (err < 0) return err; err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, hw->channels_min, hw->channels_max); if (err < 0) return err; err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, hw->rate_min, hw->rate_max); if (err < 0) return err; err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, hw->period_bytes_min, hw->period_bytes_max); if (err < 0) return err; err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS, hw->periods_min, hw->periods_max); if (err < 0) return err; err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, hw->period_bytes_min, hw->buffer_bytes_max); if (err < 0) return err; err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, snd_pcm_hw_rule_buffer_bytes_max, substream, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); if (err < 0) return err; /* FIXME: remove */ if (runtime->dma_bytes) { err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes); if (err < 0) return err; } if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) { err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, snd_pcm_hw_rule_rate, hw, SNDRV_PCM_HW_PARAM_RATE, -1); if (err < 0) return err; } /* FIXME: this belong to lowlevel */ snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); return 0; } static void pcm_release_private(struct snd_pcm_substream *substream) { if (snd_pcm_stream_linked(substream)) snd_pcm_unlink(substream); } void snd_pcm_release_substream(struct snd_pcm_substream *substream) { substream->ref_count--; if (substream->ref_count > 0) return; snd_pcm_drop(substream); if (substream->hw_opened) { if (substream->ops->hw_free && substream->runtime->status->state != SNDRV_PCM_STATE_OPEN) substream->ops->hw_free(substream); substream->ops->close(substream); substream->hw_opened = 0; } if (pm_qos_request_active(&substream->latency_pm_qos_req)) pm_qos_remove_request(&substream->latency_pm_qos_req); if (substream->pcm_release) { substream->pcm_release(substream); substream->pcm_release = NULL; } snd_pcm_detach_substream(substream); } EXPORT_SYMBOL(snd_pcm_release_substream); int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, struct file *file, struct snd_pcm_substream **rsubstream) { struct snd_pcm_substream *substream; int err; err = snd_pcm_attach_substream(pcm, stream, file, &substream); if (err < 0) return err; if (substream->ref_count > 1) { *rsubstream = substream; return 0; } err = snd_pcm_hw_constraints_init(substream); if (err < 0) { pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n"); goto error; } if ((err = substream->ops->open(substream)) < 0) goto error; substream->hw_opened = 1; err = snd_pcm_hw_constraints_complete(substream); if (err < 0) { pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n"); goto error; } *rsubstream = substream; return 0; error: snd_pcm_release_substream(substream); return err; } EXPORT_SYMBOL(snd_pcm_open_substream); static int snd_pcm_open_file(struct file *file, struct snd_pcm *pcm, int stream) { struct snd_pcm_file *pcm_file; struct snd_pcm_substream *substream; int err; err = snd_pcm_open_substream(pcm, stream, file, &substream); if (err < 0) return err; pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL); if (pcm_file == NULL) { snd_pcm_release_substream(substream); return -ENOMEM; } pcm_file->substream = substream; if (substream->ref_count == 1) { substream->file = pcm_file; substream->pcm_release = pcm_release_private; } file->private_data = pcm_file; return 0; } static int snd_pcm_playback_open(struct inode *inode, struct file *file) { struct snd_pcm *pcm; int err = nonseekable_open(inode, file); if (err < 0) return err; pcm = snd_lookup_minor_data(iminor(inode), SNDRV_DEVICE_TYPE_PCM_PLAYBACK); err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK); if (pcm) snd_card_unref(pcm->card); return err; } static int snd_pcm_capture_open(struct inode *inode, struct file *file) { struct snd_pcm *pcm; int err = nonseekable_open(inode, file); if (err < 0) return err; pcm = snd_lookup_minor_data(iminor(inode), SNDRV_DEVICE_TYPE_PCM_CAPTURE); err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE); if (pcm) snd_card_unref(pcm->card); return err; } static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream) { int err; wait_queue_t wait; if (pcm == NULL) { err = -ENODEV; goto __error1; } err = snd_card_file_add(pcm->card, file); if (err < 0) goto __error1; if (!try_module_get(pcm->card->module)) { err = -EFAULT; goto __error2; } init_waitqueue_entry(&wait, current); add_wait_queue(&pcm->open_wait, &wait); mutex_lock(&pcm->open_mutex); while (1) { err = snd_pcm_open_file(file, pcm, stream); if (err >= 0) break; if (err == -EAGAIN) { if (file->f_flags & O_NONBLOCK) { err = -EBUSY; break; } } else break; set_current_state(TASK_INTERRUPTIBLE); mutex_unlock(&pcm->open_mutex); schedule(); mutex_lock(&pcm->open_mutex); if (pcm->card->shutdown) { err = -ENODEV; break; } if (signal_pending(current)) { err = -ERESTARTSYS; break; } } remove_wait_queue(&pcm->open_wait, &wait); mutex_unlock(&pcm->open_mutex); if (err < 0) goto __error; return err; __error: module_put(pcm->card->module); __error2: snd_card_file_remove(pcm->card, file); __error1: return err; } static int snd_pcm_release(struct inode *inode, struct file *file) { struct snd_pcm *pcm; struct snd_pcm_substream *substream; struct snd_pcm_file *pcm_file; pcm_file = file->private_data; substream = pcm_file->substream; if (snd_BUG_ON(!substream)) return -ENXIO; pcm = substream->pcm; mutex_lock(&pcm->open_mutex); snd_pcm_release_substream(substream); kfree(pcm_file); mutex_unlock(&pcm->open_mutex); wake_up(&pcm->open_wait); module_put(pcm->card->module); snd_card_file_remove(pcm->card, file); return 0; } static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream, snd_pcm_uframes_t frames) { struct snd_pcm_runtime *runtime = substream->runtime; snd_pcm_sframes_t appl_ptr; snd_pcm_sframes_t ret; snd_pcm_sframes_t hw_avail; if (frames == 0) return 0; snd_pcm_stream_lock_irq(substream); switch (runtime->status->state) { case SNDRV_PCM_STATE_PREPARED: break; case SNDRV_PCM_STATE_DRAINING: case SNDRV_PCM_STATE_RUNNING: if (snd_pcm_update_hw_ptr(substream) >= 0) break; /* Fall through */ case SNDRV_PCM_STATE_XRUN: ret = -EPIPE; goto __end; case SNDRV_PCM_STATE_SUSPENDED: ret = -ESTRPIPE; goto __end; default: ret = -EBADFD; goto __end; } hw_avail = snd_pcm_playback_hw_avail(runtime); if (hw_avail <= 0) { ret = 0; goto __end; } if (frames > (snd_pcm_uframes_t)hw_avail) frames = hw_avail; appl_ptr = runtime->control->appl_ptr - frames; if (appl_ptr < 0) appl_ptr += runtime->boundary; runtime->control->appl_ptr = appl_ptr; ret = frames; __end: snd_pcm_stream_unlock_irq(substream); return ret; } static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream, snd_pcm_uframes_t frames) { struct snd_pcm_runtime *runtime = substream->runtime; snd_pcm_sframes_t appl_ptr; snd_pcm_sframes_t ret; snd_pcm_sframes_t hw_avail; if (frames == 0) return 0; snd_pcm_stream_lock_irq(substream); switch (runtime->status->state) { case SNDRV_PCM_STATE_PREPARED: case SNDRV_PCM_STATE_DRAINING: break; case SNDRV_PCM_STATE_RUNNING: if (snd_pcm_update_hw_ptr(substream) >= 0) break; /* Fall through */ case SNDRV_PCM_STATE_XRUN: ret = -EPIPE; goto __end; case SNDRV_PCM_STATE_SUSPENDED: ret = -ESTRPIPE; goto __end; default: ret = -EBADFD; goto __end; } hw_avail = snd_pcm_capture_hw_avail(runtime); if (hw_avail <= 0) { ret = 0; goto __end; } if (frames > (snd_pcm_uframes_t)hw_avail) frames = hw_avail; appl_ptr = runtime->control->appl_ptr - frames; if (appl_ptr < 0) appl_ptr += runtime->boundary; runtime->control->appl_ptr = appl_ptr; ret = frames; __end: snd_pcm_stream_unlock_irq(substream); return ret; } static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream, snd_pcm_uframes_t frames) { struct snd_pcm_runtime *runtime = substream->runtime; snd_pcm_sframes_t appl_ptr; snd_pcm_sframes_t ret; snd_pcm_sframes_t avail; if (frames == 0) return 0; snd_pcm_stream_lock_irq(substream); switch (runtime->status->state) { case SNDRV_PCM_STATE_PREPARED: case SNDRV_PCM_STATE_PAUSED: break; case SNDRV_PCM_STATE_DRAINING: case SNDRV_PCM_STATE_RUNNING: if (snd_pcm_update_hw_ptr(substream) >= 0) break; /* Fall through */ case SNDRV_PCM_STATE_XRUN: ret = -EPIPE; goto __end; case SNDRV_PCM_STATE_SUSPENDED: ret = -ESTRPIPE; goto __end; default: ret = -EBADFD; goto __end; } avail = snd_pcm_playback_avail(runtime); if (avail <= 0) { ret = 0; goto __end; } if (frames > (snd_pcm_uframes_t)avail) frames = avail; appl_ptr = runtime->control->appl_ptr + frames; if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) appl_ptr -= runtime->boundary; runtime->control->appl_ptr = appl_ptr; ret = frames; __end: snd_pcm_stream_unlock_irq(substream); return ret; } static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream, snd_pcm_uframes_t frames) { struct snd_pcm_runtime *runtime = substream->runtime; snd_pcm_sframes_t appl_ptr; snd_pcm_sframes_t ret; snd_pcm_sframes_t avail; if (frames == 0) return 0; snd_pcm_stream_lock_irq(substream); switch (runtime->status->state) { case SNDRV_PCM_STATE_PREPARED: case SNDRV_PCM_STATE_DRAINING: case SNDRV_PCM_STATE_PAUSED: break; case SNDRV_PCM_STATE_RUNNING: if (snd_pcm_update_hw_ptr(substream) >= 0) break; /* Fall through */ case SNDRV_PCM_STATE_XRUN: ret = -EPIPE; goto __end; case SNDRV_PCM_STATE_SUSPENDED: ret = -ESTRPIPE; goto __end; default: ret = -EBADFD; goto __end; } avail = snd_pcm_capture_avail(runtime); if (avail <= 0) { ret = 0; goto __end; } if (frames > (snd_pcm_uframes_t)avail) frames = avail; appl_ptr = runtime->control->appl_ptr + frames; if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) appl_ptr -= runtime->boundary; runtime->control->appl_ptr = appl_ptr; ret = frames; __end: snd_pcm_stream_unlock_irq(substream); return ret; } static int snd_pcm_hwsync(struct snd_pcm_substream *substream) { struct snd_pcm_runtime *runtime = substream->runtime; int err; snd_pcm_stream_lock_irq(substream); switch (runtime->status->state) { case SNDRV_PCM_STATE_DRAINING: if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) goto __badfd; /* Fall through */ case SNDRV_PCM_STATE_RUNNING: if ((err = snd_pcm_update_hw_ptr(substream)) < 0) break; /* Fall through */ case SNDRV_PCM_STATE_PREPARED: err = 0; break; case SNDRV_PCM_STATE_SUSPENDED: err = -ESTRPIPE; break; case SNDRV_PCM_STATE_XRUN: err = -EPIPE; break; default: __badfd: err = -EBADFD; break; } snd_pcm_stream_unlock_irq(substream); return err; } static int snd_pcm_delay(struct snd_pcm_substream *substream, snd_pcm_sframes_t __user *res) { struct snd_pcm_runtime *runtime = substream->runtime; int err; snd_pcm_sframes_t n = 0; snd_pcm_stream_lock_irq(substream); switch (runtime->status->state) { case SNDRV_PCM_STATE_DRAINING: if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) goto __badfd; /* Fall through */ case SNDRV_PCM_STATE_RUNNING: if ((err = snd_pcm_update_hw_ptr(substream)) < 0) break; /* Fall through */ case SNDRV_PCM_STATE_PREPARED: case SNDRV_PCM_STATE_SUSPENDED: err = 0; if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) n = snd_pcm_playback_hw_avail(runtime); else n = snd_pcm_capture_avail(runtime); n += runtime->delay; break; case SNDRV_PCM_STATE_XRUN: err = -EPIPE; break; default: __badfd: err = -EBADFD; break; } snd_pcm_stream_unlock_irq(substream); if (!err) if (put_user(n, res)) err = -EFAULT; return err; } static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, struct snd_pcm_sync_ptr __user *_sync_ptr) { struct snd_pcm_runtime *runtime = substream->runtime; struct snd_pcm_sync_ptr sync_ptr; volatile struct snd_pcm_mmap_status *status; volatile struct snd_pcm_mmap_control *control; int err; memset(&sync_ptr, 0, sizeof(sync_ptr)); if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags))) return -EFAULT; if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control))) return -EFAULT; status = runtime->status; control = runtime->control; if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) { err = snd_pcm_hwsync(substream); if (err < 0) return err; } snd_pcm_stream_lock_irq(substream); if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) control->appl_ptr = sync_ptr.c.control.appl_ptr; else sync_ptr.c.control.appl_ptr = control->appl_ptr; if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) control->avail_min = sync_ptr.c.control.avail_min; else sync_ptr.c.control.avail_min = control->avail_min; sync_ptr.s.status.state = status->state; sync_ptr.s.status.hw_ptr = status->hw_ptr; sync_ptr.s.status.tstamp = status->tstamp; sync_ptr.s.status.suspended_state = status->suspended_state; sync_ptr.s.status.audio_tstamp = status->audio_tstamp; snd_pcm_stream_unlock_irq(substream); if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr))) return -EFAULT; return 0; } static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg) { struct snd_pcm_runtime *runtime = substream->runtime; int arg; if (get_user(arg, _arg)) return -EFAULT; if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST) return -EINVAL; runtime->tstamp_type = arg; return 0; } static int snd_pcm_common_ioctl1(struct file *file, struct snd_pcm_substream *substream, unsigned int cmd, void __user *arg) { switch (cmd) { case SNDRV_PCM_IOCTL_PVERSION: return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0; case SNDRV_PCM_IOCTL_INFO: return snd_pcm_info_user(substream, arg); case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */ return 0; case SNDRV_PCM_IOCTL_TTSTAMP: return snd_pcm_tstamp(substream, arg); case SNDRV_PCM_IOCTL_HW_REFINE: return snd_pcm_hw_refine_user(substream, arg); case SNDRV_PCM_IOCTL_HW_PARAMS: return snd_pcm_hw_params_user(substream, arg); case SNDRV_PCM_IOCTL_HW_FREE: return snd_pcm_hw_free(substream); case SNDRV_PCM_IOCTL_SW_PARAMS: return snd_pcm_sw_params_user(substream, arg); case SNDRV_PCM_IOCTL_STATUS: return snd_pcm_status_user(substream, arg, false); case SNDRV_PCM_IOCTL_STATUS_EXT: return snd_pcm_status_user(substream, arg, true); case SNDRV_PCM_IOCTL_CHANNEL_INFO: return snd_pcm_channel_info_user(substream, arg); case SNDRV_PCM_IOCTL_PREPARE: return snd_pcm_prepare(substream, file); case SNDRV_PCM_IOCTL_RESET: return snd_pcm_reset(substream); case SNDRV_PCM_IOCTL_START: return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING); case SNDRV_PCM_IOCTL_LINK: return snd_pcm_link(substream, (int)(unsigned long) arg); case SNDRV_PCM_IOCTL_UNLINK: return snd_pcm_unlink(substream); case SNDRV_PCM_IOCTL_RESUME: return snd_pcm_resume(substream); case SNDRV_PCM_IOCTL_XRUN: return snd_pcm_xrun(substream); case SNDRV_PCM_IOCTL_HWSYNC: return snd_pcm_hwsync(substream); case SNDRV_PCM_IOCTL_DELAY: return snd_pcm_delay(substream, arg); case SNDRV_PCM_IOCTL_SYNC_PTR: return snd_pcm_sync_ptr(substream, arg); #ifdef CONFIG_SND_SUPPORT_OLD_API case SNDRV_PCM_IOCTL_HW_REFINE_OLD: return snd_pcm_hw_refine_old_user(substream, arg); case SNDRV_PCM_IOCTL_HW_PARAMS_OLD: return snd_pcm_hw_params_old_user(substream, arg); #endif case SNDRV_PCM_IOCTL_DRAIN: return snd_pcm_drain(substream, file); case SNDRV_PCM_IOCTL_DROP: return snd_pcm_drop(substream); case SNDRV_PCM_IOCTL_PAUSE: { int res; snd_pcm_stream_lock_irq(substream); res = snd_pcm_pause(substream, (int)(unsigned long)arg); snd_pcm_stream_unlock_irq(substream); return res; } } pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd); return -ENOTTY; } static int snd_pcm_playback_ioctl1(struct file *file, struct snd_pcm_substream *substream, unsigned int cmd, void __user *arg) { if (snd_BUG_ON(!substream)) return -ENXIO; if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) return -EINVAL; switch (cmd) { case SNDRV_PCM_IOCTL_WRITEI_FRAMES: { struct snd_xferi xferi; struct snd_xferi __user *_xferi = arg; struct snd_pcm_runtime *runtime = substream->runtime; snd_pcm_sframes_t result; if (runtime->status->state == SNDRV_PCM_STATE_OPEN) return -EBADFD; if (put_user(0, &_xferi->result)) return -EFAULT; if (copy_from_user(&xferi, _xferi, sizeof(xferi))) return -EFAULT; result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames); __put_user(result, &_xferi->result); return result < 0 ? result : 0; } case SNDRV_PCM_IOCTL_WRITEN_FRAMES: { struct snd_xfern xfern; struct snd_xfern __user *_xfern = arg; struct snd_pcm_runtime *runtime = substream->runtime; void __user **bufs; snd_pcm_sframes_t result; if (runtime->status->state == SNDRV_PCM_STATE_OPEN) return -EBADFD; if (runtime->channels > 128) return -EINVAL; if (put_user(0, &_xfern->result)) return -EFAULT; if (copy_from_user(&xfern, _xfern, sizeof(xfern))) return -EFAULT; bufs = memdup_user(xfern.bufs, sizeof(void *) * runtime->channels); if (IS_ERR(bufs)) return PTR_ERR(bufs); result = snd_pcm_lib_writev(substream, bufs, xfern.frames); kfree(bufs); __put_user(result, &_xfern->result); return result < 0 ? result : 0; } case SNDRV_PCM_IOCTL_REWIND: { snd_pcm_uframes_t frames; snd_pcm_uframes_t __user *_frames = arg; snd_pcm_sframes_t result; if (get_user(frames, _frames)) return -EFAULT; if (put_user(0, _frames)) return -EFAULT; result = snd_pcm_playback_rewind(substream, frames); __put_user(result, _frames); return result < 0 ? result : 0; } case SNDRV_PCM_IOCTL_FORWARD: { snd_pcm_uframes_t frames; snd_pcm_uframes_t __user *_frames = arg; snd_pcm_sframes_t result; if (get_user(frames, _frames)) return -EFAULT; if (put_user(0, _frames)) return -EFAULT; result = snd_pcm_playback_forward(substream, frames); __put_user(result, _frames); return result < 0 ? result : 0; } } return snd_pcm_common_ioctl1(file, substream, cmd, arg); } static int snd_pcm_capture_ioctl1(struct file *file, struct snd_pcm_substream *substream, unsigned int cmd, void __user *arg) { if (snd_BUG_ON(!substream)) return -ENXIO; if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE)) return -EINVAL; switch (cmd) { case SNDRV_PCM_IOCTL_READI_FRAMES: { struct snd_xferi xferi; struct snd_xferi __user *_xferi = arg; struct snd_pcm_runtime *runtime = substream->runtime; snd_pcm_sframes_t result; if (runtime->status->state == SNDRV_PCM_STATE_OPEN) return -EBADFD; if (put_user(0, &_xferi->result)) return -EFAULT; if (copy_from_user(&xferi, _xferi, sizeof(xferi))) return -EFAULT; result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames); __put_user(result, &_xferi->result); return result < 0 ? result : 0; } case SNDRV_PCM_IOCTL_READN_FRAMES: { struct snd_xfern xfern; struct snd_xfern __user *_xfern = arg; struct snd_pcm_runtime *runtime = substream->runtime; void *bufs; snd_pcm_sframes_t result; if (runtime->status->state == SNDRV_PCM_STATE_OPEN) return -EBADFD; if (runtime->channels > 128) return -EINVAL; if (put_user(0, &_xfern->result)) return -EFAULT; if (copy_from_user(&xfern, _xfern, sizeof(xfern))) return -EFAULT; bufs = memdup_user(xfern.bufs, sizeof(void *) * runtime->channels); if (IS_ERR(bufs)) return PTR_ERR(bufs); result = snd_pcm_lib_readv(substream, bufs, xfern.frames); kfree(bufs); __put_user(result, &_xfern->result); return result < 0 ? result : 0; } case SNDRV_PCM_IOCTL_REWIND: { snd_pcm_uframes_t frames; snd_pcm_uframes_t __user *_frames = arg; snd_pcm_sframes_t result; if (get_user(frames, _frames)) return -EFAULT; if (put_user(0, _frames)) return -EFAULT; result = snd_pcm_capture_rewind(substream, frames); __put_user(result, _frames); return result < 0 ? result : 0; } case SNDRV_PCM_IOCTL_FORWARD: { snd_pcm_uframes_t frames; snd_pcm_uframes_t __user *_frames = arg; snd_pcm_sframes_t result; if (get_user(frames, _frames)) return -EFAULT; if (put_user(0, _frames)) return -EFAULT; result = snd_pcm_capture_forward(substream, frames); __put_user(result, _frames); return result < 0 ? result : 0; } } return snd_pcm_common_ioctl1(file, substream, cmd, arg); } static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { struct snd_pcm_file *pcm_file; pcm_file = file->private_data; if (((cmd >> 8) & 0xff) != 'A') return -ENOTTY; return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd, (void __user *)arg); } static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { struct snd_pcm_file *pcm_file; pcm_file = file->private_data; if (((cmd >> 8) & 0xff) != 'A') return -ENOTTY; return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd, (void __user *)arg); } int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, unsigned int cmd, void *arg) { mm_segment_t fs; int result; fs = snd_enter_user(); switch (substream->stream) { case SNDRV_PCM_STREAM_PLAYBACK: result = snd_pcm_playback_ioctl1(NULL, substream, cmd, (void __user *)arg); break; case SNDRV_PCM_STREAM_CAPTURE: result = snd_pcm_capture_ioctl1(NULL, substream, cmd, (void __user *)arg); break; default: result = -EINVAL; break; } snd_leave_user(fs); return result; } EXPORT_SYMBOL(snd_pcm_kernel_ioctl); static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, loff_t * offset) { struct snd_pcm_file *pcm_file; struct snd_pcm_substream *substream; struct snd_pcm_runtime *runtime; snd_pcm_sframes_t result; pcm_file = file->private_data; substream = pcm_file->substream; if (PCM_RUNTIME_CHECK(substream)) return -ENXIO; runtime = substream->runtime; if (runtime->status->state == SNDRV_PCM_STATE_OPEN) return -EBADFD; if (!frame_aligned(runtime, count)) return -EINVAL; count = bytes_to_frames(runtime, count); result = snd_pcm_lib_read(substream, buf, count); if (result > 0) result = frames_to_bytes(runtime, result); return result; } static ssize_t snd_pcm_write(struct file *file, const char __user *buf, size_t count, loff_t * offset) { struct snd_pcm_file *pcm_file; struct snd_pcm_substream *substream; struct snd_pcm_runtime *runtime; snd_pcm_sframes_t result; pcm_file = file->private_data; substream = pcm_file->substream; if (PCM_RUNTIME_CHECK(substream)) return -ENXIO; runtime = substream->runtime; if (runtime->status->state == SNDRV_PCM_STATE_OPEN) return -EBADFD; if (!frame_aligned(runtime, count)) return -EINVAL; count = bytes_to_frames(runtime, count); result = snd_pcm_lib_write(substream, buf, count); if (result > 0) result = frames_to_bytes(runtime, result); return result; } static ssize_t snd_pcm_readv(struct kiocb *iocb, struct iov_iter *to) { struct snd_pcm_file *pcm_file; struct snd_pcm_substream *substream; struct snd_pcm_runtime *runtime; snd_pcm_sframes_t result; unsigned long i; void __user **bufs; snd_pcm_uframes_t frames; pcm_file = iocb->ki_filp->private_data; substream = pcm_file->substream; if (PCM_RUNTIME_CHECK(substream)) return -ENXIO; runtime = substream->runtime; if (runtime->status->state == SNDRV_PCM_STATE_OPEN) return -EBADFD; if (!iter_is_iovec(to)) return -EINVAL; if (to->nr_segs > 1024 || to->nr_segs != runtime->channels) return -EINVAL; if (!frame_aligned(runtime, to->iov->iov_len)) return -EINVAL; frames = bytes_to_samples(runtime, to->iov->iov_len); bufs = kmalloc(sizeof(void *) * to->nr_segs, GFP_KERNEL); if (bufs == NULL) return -ENOMEM; for (i = 0; i < to->nr_segs; ++i) bufs[i] = to->iov[i].iov_base; result = snd_pcm_lib_readv(substream, bufs, frames); if (result > 0) result = frames_to_bytes(runtime, result); kfree(bufs); return result; } static ssize_t snd_pcm_writev(struct kiocb *iocb, struct iov_iter *from) { struct snd_pcm_file *pcm_file; struct snd_pcm_substream *substream; struct snd_pcm_runtime *runtime; snd_pcm_sframes_t result; unsigned long i; void __user **bufs; snd_pcm_uframes_t frames; pcm_file = iocb->ki_filp->private_data; substream = pcm_file->substream; if (PCM_RUNTIME_CHECK(substream)) return -ENXIO; runtime = substream->runtime; if (runtime->status->state == SNDRV_PCM_STATE_OPEN) return -EBADFD; if (!iter_is_iovec(from)) return -EINVAL; if (from->nr_segs > 128 || from->nr_segs != runtime->channels || !frame_aligned(runtime, from->iov->iov_len)) return -EINVAL; frames = bytes_to_samples(runtime, from->iov->iov_len); bufs = kmalloc(sizeof(void *) * from->nr_segs, GFP_KERNEL); if (bufs == NULL) return -ENOMEM; for (i = 0; i < from->nr_segs; ++i) bufs[i] = from->iov[i].iov_base; result = snd_pcm_lib_writev(substream, bufs, frames); if (result > 0) result = frames_to_bytes(runtime, result); kfree(bufs); return result; } static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait) { struct snd_pcm_file *pcm_file; struct snd_pcm_substream *substream; struct snd_pcm_runtime *runtime; unsigned int mask; snd_pcm_uframes_t avail; pcm_file = file->private_data; substream = pcm_file->substream; if (PCM_RUNTIME_CHECK(substream)) return POLLOUT | POLLWRNORM | POLLERR; runtime = substream->runtime; poll_wait(file, &runtime->sleep, wait); snd_pcm_stream_lock_irq(substream); avail = snd_pcm_playback_avail(runtime); switch (runtime->status->state) { case SNDRV_PCM_STATE_RUNNING: case SNDRV_PCM_STATE_PREPARED: case SNDRV_PCM_STATE_PAUSED: if (avail >= runtime->control->avail_min) { mask = POLLOUT | POLLWRNORM; break; } /* Fall through */ case SNDRV_PCM_STATE_DRAINING: mask = 0; break; default: mask = POLLOUT | POLLWRNORM | POLLERR; break; } snd_pcm_stream_unlock_irq(substream); return mask; } static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait) { struct snd_pcm_file *pcm_file; struct snd_pcm_substream *substream; struct snd_pcm_runtime *runtime; unsigned int mask; snd_pcm_uframes_t avail; pcm_file = file->private_data; substream = pcm_file->substream; if (PCM_RUNTIME_CHECK(substream)) return POLLIN | POLLRDNORM | POLLERR; runtime = substream->runtime; poll_wait(file, &runtime->sleep, wait); snd_pcm_stream_lock_irq(substream); avail = snd_pcm_capture_avail(runtime); switch (runtime->status->state) { case SNDRV_PCM_STATE_RUNNING: case SNDRV_PCM_STATE_PREPARED: case SNDRV_PCM_STATE_PAUSED: if (avail >= runtime->control->avail_min) { mask = POLLIN | POLLRDNORM; break; } mask = 0; break; case SNDRV_PCM_STATE_DRAINING: if (avail > 0) { mask = POLLIN | POLLRDNORM; break; } /* Fall through */ default: mask = POLLIN | POLLRDNORM | POLLERR; break; } snd_pcm_stream_unlock_irq(substream); return mask; } /* * mmap support */ /* * Only on coherent architectures, we can mmap the status and the control records * for effcient data transfer. On others, we have to use HWSYNC ioctl... */ #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) /* * mmap status record */ static int snd_pcm_mmap_status_fault(struct vm_area_struct *area, struct vm_fault *vmf) { struct snd_pcm_substream *substream = area->vm_private_data; struct snd_pcm_runtime *runtime; if (substream == NULL) return VM_FAULT_SIGBUS; runtime = substream->runtime; vmf->page = virt_to_page(runtime->status); get_page(vmf->page); return 0; } static const struct vm_operations_struct snd_pcm_vm_ops_status = { .fault = snd_pcm_mmap_status_fault, }; static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area) { long size; if (!(area->vm_flags & VM_READ)) return -EINVAL; size = area->vm_end - area->vm_start; if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))) return -EINVAL; area->vm_ops = &snd_pcm_vm_ops_status; area->vm_private_data = substream; area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; return 0; } /* * mmap control record */ static int snd_pcm_mmap_control_fault(struct vm_area_struct *area, struct vm_fault *vmf) { struct snd_pcm_substream *substream = area->vm_private_data; struct snd_pcm_runtime *runtime; if (substream == NULL) return VM_FAULT_SIGBUS; runtime = substream->runtime; vmf->page = virt_to_page(runtime->control); get_page(vmf->page); return 0; } static const struct vm_operations_struct snd_pcm_vm_ops_control = { .fault = snd_pcm_mmap_control_fault, }; static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area) { long size; if (!(area->vm_flags & VM_READ)) return -EINVAL; size = area->vm_end - area->vm_start; if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))) return -EINVAL; area->vm_ops = &snd_pcm_vm_ops_control; area->vm_private_data = substream; area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; return 0; } #else /* ! coherent mmap */ /* * don't support mmap for status and control records. */ static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area) { return -ENXIO; } static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area) { return -ENXIO; } #endif /* coherent mmap */ static inline struct page * snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs) { void *vaddr = substream->runtime->dma_area + ofs; return virt_to_page(vaddr); } /* * fault callback for mmapping a RAM page */ static int snd_pcm_mmap_data_fault(struct vm_area_struct *area, struct vm_fault *vmf) { struct snd_pcm_substream *substream = area->vm_private_data; struct snd_pcm_runtime *runtime; unsigned long offset; struct page * page; size_t dma_bytes; if (substream == NULL) return VM_FAULT_SIGBUS; runtime = substream->runtime; offset = vmf->pgoff << PAGE_SHIFT; dma_bytes = PAGE_ALIGN(runtime->dma_bytes); if (offset > dma_bytes - PAGE_SIZE) return VM_FAULT_SIGBUS; if (substream->ops->page) page = substream->ops->page(substream, offset); else page = snd_pcm_default_page_ops(substream, offset); if (!page) return VM_FAULT_SIGBUS; get_page(page); vmf->page = page; return 0; } static const struct vm_operations_struct snd_pcm_vm_ops_data = { .open = snd_pcm_mmap_data_open, .close = snd_pcm_mmap_data_close, }; static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = { .open = snd_pcm_mmap_data_open, .close = snd_pcm_mmap_data_close, .fault = snd_pcm_mmap_data_fault, }; /* * mmap the DMA buffer on RAM */ /** * snd_pcm_lib_default_mmap - Default PCM data mmap function * @substream: PCM substream * @area: VMA * * This is the default mmap handler for PCM data. When mmap pcm_ops is NULL, * this function is invoked implicitly. */ int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, struct vm_area_struct *area) { area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; #ifdef CONFIG_GENERIC_ALLOCATOR if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) { area->vm_page_prot = pgprot_writecombine(area->vm_page_prot); return remap_pfn_range(area, area->vm_start, substream->dma_buffer.addr >> PAGE_SHIFT, area->vm_end - area->vm_start, area->vm_page_prot); } #endif /* CONFIG_GENERIC_ALLOCATOR */ #ifndef CONFIG_X86 /* for avoiding warnings arch/x86/mm/pat.c */ if (!substream->ops->page && substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) return dma_mmap_coherent(substream->dma_buffer.dev.dev, area, substream->runtime->dma_area, substream->runtime->dma_addr, substream->runtime->dma_bytes); #endif /* CONFIG_X86 */ /* mmap with fault handler */ area->vm_ops = &snd_pcm_vm_ops_data_fault; return 0; } EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap); /* * mmap the DMA buffer on I/O memory area */ #if SNDRV_PCM_INFO_MMAP_IOMEM /** * snd_pcm_lib_mmap_iomem - Default PCM data mmap function for I/O mem * @substream: PCM substream * @area: VMA * * When your hardware uses the iomapped pages as the hardware buffer and * wants to mmap it, pass this function as mmap pcm_ops. Note that this * is supposed to work only on limited architectures. */ int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_struct *area) { struct snd_pcm_runtime *runtime = substream->runtime;; area->vm_page_prot = pgprot_noncached(area->vm_page_prot); return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes); } EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); #endif /* SNDRV_PCM_INFO_MMAP */ /* * mmap DMA buffer */ int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, struct vm_area_struct *area) { struct snd_pcm_runtime *runtime; long size; unsigned long offset; size_t dma_bytes; int err; if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { if (!(area->vm_flags & (VM_WRITE|VM_READ))) return -EINVAL; } else { if (!(area->vm_flags & VM_READ)) return -EINVAL; } runtime = substream->runtime; if (runtime->status->state == SNDRV_PCM_STATE_OPEN) return -EBADFD; if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) return -ENXIO; if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) return -EINVAL; size = area->vm_end - area->vm_start; offset = area->vm_pgoff << PAGE_SHIFT; dma_bytes = PAGE_ALIGN(runtime->dma_bytes); if ((size_t)size > dma_bytes) return -EINVAL; if (offset > dma_bytes - size) return -EINVAL; area->vm_ops = &snd_pcm_vm_ops_data; area->vm_private_data = substream; if (substream->ops->mmap) err = substream->ops->mmap(substream, area); else err = snd_pcm_lib_default_mmap(substream, area); if (!err) atomic_inc(&substream->mmap_count); return err; } EXPORT_SYMBOL(snd_pcm_mmap_data); static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) { struct snd_pcm_file * pcm_file; struct snd_pcm_substream *substream; unsigned long offset; pcm_file = file->private_data; substream = pcm_file->substream; if (PCM_RUNTIME_CHECK(substream)) return -ENXIO; offset = area->vm_pgoff << PAGE_SHIFT; switch (offset) { case SNDRV_PCM_MMAP_OFFSET_STATUS: if (pcm_file->no_compat_mmap) return -ENXIO; return snd_pcm_mmap_status(substream, file, area); case SNDRV_PCM_MMAP_OFFSET_CONTROL: if (pcm_file->no_compat_mmap) return -ENXIO; return snd_pcm_mmap_control(substream, file, area); default: return snd_pcm_mmap_data(substream, file, area); } return 0; } static int snd_pcm_fasync(int fd, struct file * file, int on) { struct snd_pcm_file * pcm_file; struct snd_pcm_substream *substream; struct snd_pcm_runtime *runtime; pcm_file = file->private_data; substream = pcm_file->substream; if (PCM_RUNTIME_CHECK(substream)) return -ENXIO; runtime = substream->runtime; return fasync_helper(fd, file, on, &runtime->fasync); } /* * ioctl32 compat */ #ifdef CONFIG_COMPAT #include "pcm_compat.c" #else #define snd_pcm_ioctl_compat NULL #endif /* * To be removed helpers to keep binary compatibility */ #ifdef CONFIG_SND_SUPPORT_OLD_API #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5)) #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5)) static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params, struct snd_pcm_hw_params_old *oparams) { unsigned int i; memset(params, 0, sizeof(*params)); params->flags = oparams->flags; for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) params->masks[i].bits[0] = oparams->masks[i]; memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals)); params->rmask = __OLD_TO_NEW_MASK(oparams->rmask); params->cmask = __OLD_TO_NEW_MASK(oparams->cmask); params->info = oparams->info; params->msbits = oparams->msbits; params->rate_num = oparams->rate_num; params->rate_den = oparams->rate_den; params->fifo_size = oparams->fifo_size; } static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams, struct snd_pcm_hw_params *params) { unsigned int i; memset(oparams, 0, sizeof(*oparams)); oparams->flags = params->flags; for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) oparams->masks[i] = params->masks[i].bits[0]; memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals)); oparams->rmask = __NEW_TO_OLD_MASK(params->rmask); oparams->cmask = __NEW_TO_OLD_MASK(params->cmask); oparams->info = params->info; oparams->msbits = params->msbits; oparams->rate_num = params->rate_num; oparams->rate_den = params->rate_den; oparams->fifo_size = params->fifo_size; } static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, struct snd_pcm_hw_params_old __user * _oparams) { struct snd_pcm_hw_params *params; struct snd_pcm_hw_params_old *oparams = NULL; int err; params = kmalloc(sizeof(*params), GFP_KERNEL); if (!params) return -ENOMEM; oparams = memdup_user(_oparams, sizeof(*oparams)); if (IS_ERR(oparams)) { err = PTR_ERR(oparams); goto out; } snd_pcm_hw_convert_from_old_params(params, oparams); err = snd_pcm_hw_refine(substream, params); snd_pcm_hw_convert_to_old_params(oparams, params); if (copy_to_user(_oparams, oparams, sizeof(*oparams))) { if (!err) err = -EFAULT; } kfree(oparams); out: kfree(params); return err; } static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, struct snd_pcm_hw_params_old __user * _oparams) { struct snd_pcm_hw_params *params; struct snd_pcm_hw_params_old *oparams = NULL; int err; params = kmalloc(sizeof(*params), GFP_KERNEL); if (!params) return -ENOMEM; oparams = memdup_user(_oparams, sizeof(*oparams)); if (IS_ERR(oparams)) { err = PTR_ERR(oparams); goto out; } snd_pcm_hw_convert_from_old_params(params, oparams); err = snd_pcm_hw_params(substream, params); snd_pcm_hw_convert_to_old_params(oparams, params); if (copy_to_user(_oparams, oparams, sizeof(*oparams))) { if (!err) err = -EFAULT; } kfree(oparams); out: kfree(params); return err; } #endif /* CONFIG_SND_SUPPORT_OLD_API */ #ifndef CONFIG_MMU static unsigned long snd_pcm_get_unmapped_area(struct file *file, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags) { struct snd_pcm_file *pcm_file = file->private_data; struct snd_pcm_substream *substream = pcm_file->substream; struct snd_pcm_runtime *runtime = substream->runtime; unsigned long offset = pgoff << PAGE_SHIFT; switch (offset) { case SNDRV_PCM_MMAP_OFFSET_STATUS: return (unsigned long)runtime->status; case SNDRV_PCM_MMAP_OFFSET_CONTROL: return (unsigned long)runtime->control; default: return (unsigned long)runtime->dma_area + offset; } } #else # define snd_pcm_get_unmapped_area NULL #endif /* * Register section */ const struct file_operations snd_pcm_f_ops[2] = { { .owner = THIS_MODULE, .write = snd_pcm_write, .write_iter = snd_pcm_writev, .open = snd_pcm_playback_open, .release = snd_pcm_release, .llseek = no_llseek, .poll = snd_pcm_playback_poll, .unlocked_ioctl = snd_pcm_playback_ioctl, .compat_ioctl = snd_pcm_ioctl_compat, .mmap = snd_pcm_mmap, .fasync = snd_pcm_fasync, .get_unmapped_area = snd_pcm_get_unmapped_area, }, { .owner = THIS_MODULE, .read = snd_pcm_read, .read_iter = snd_pcm_readv, .open = snd_pcm_capture_open, .release = snd_pcm_release, .llseek = no_llseek, .poll = snd_pcm_capture_poll, .unlocked_ioctl = snd_pcm_capture_ioctl, .compat_ioctl = snd_pcm_ioctl_compat, .mmap = snd_pcm_mmap, .fasync = snd_pcm_fasync, .get_unmapped_area = snd_pcm_get_unmapped_area, } };