| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * Digital Audio (PCM) abstract layer |
| * Copyright (c) by Jaroslav Kysela <perex@perex.cz> |
| */ |
| |
| #include <linux/mm.h> |
| #include <linux/module.h> |
| #include <linux/file.h> |
| #include <linux/slab.h> |
| #include <linux/sched/signal.h> |
| #include <linux/time.h> |
| #include <linux/pm_qos.h> |
| #include <linux/io.h> |
| #include <linux/dma-mapping.h> |
| #include <linux/vmalloc.h> |
| #include <sound/core.h> |
| #include <sound/control.h> |
| #include <sound/info.h> |
| #include <sound/pcm.h> |
| #include <sound/pcm_params.h> |
| #include <sound/timer.h> |
| #include <sound/minors.h> |
| #include <linux/uio.h> |
| #include <linux/delay.h> |
| |
| #include "pcm_local.h" |
| |
| #ifdef CONFIG_SND_DEBUG |
| #define CREATE_TRACE_POINTS |
| #include "pcm_param_trace.h" |
| #else |
| #define trace_hw_mask_param_enabled() 0 |
| #define trace_hw_interval_param_enabled() 0 |
| #define trace_hw_mask_param(substream, type, index, prev, curr) |
| #define trace_hw_interval_param(substream, type, index, prev, curr) |
| #endif |
| |
| /* |
| * 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 DECLARE_RWSEM(snd_pcm_link_rwsem); |
| |
| void snd_pcm_group_init(struct snd_pcm_group *group) |
| { |
| spin_lock_init(&group->lock); |
| mutex_init(&group->mutex); |
| INIT_LIST_HEAD(&group->substreams); |
| refcount_set(&group->refs, 1); |
| } |
| |
| /* define group lock helpers */ |
| #define DEFINE_PCM_GROUP_LOCK(action, mutex_action) \ |
| static void snd_pcm_group_ ## action(struct snd_pcm_group *group, bool nonatomic) \ |
| { \ |
| if (nonatomic) \ |
| mutex_ ## mutex_action(&group->mutex); \ |
| else \ |
| spin_ ## action(&group->lock); \ |
| } |
| |
| DEFINE_PCM_GROUP_LOCK(lock, lock); |
| DEFINE_PCM_GROUP_LOCK(unlock, unlock); |
| DEFINE_PCM_GROUP_LOCK(lock_irq, lock); |
| DEFINE_PCM_GROUP_LOCK(unlock_irq, unlock); |
| |
| /** |
| * 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) |
| { |
| snd_pcm_group_lock(&substream->self_group, substream->pcm->nonatomic); |
| } |
| 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) |
| { |
| snd_pcm_group_unlock(&substream->self_group, substream->pcm->nonatomic); |
| } |
| 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) |
| { |
| snd_pcm_group_lock_irq(&substream->self_group, |
| substream->pcm->nonatomic); |
| } |
| 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_group_unlock_irq(&substream->self_group, |
| substream->pcm->nonatomic); |
| } |
| 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) |
| mutex_lock(&substream->self_group.mutex); |
| else |
| spin_lock_irqsave(&substream->self_group.lock, flags); |
| 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) |
| { |
| if (substream->pcm->nonatomic) |
| mutex_unlock(&substream->self_group.mutex); |
| else |
| spin_unlock_irqrestore(&substream->self_group.lock, flags); |
| } |
| EXPORT_SYMBOL_GPL(snd_pcm_stream_unlock_irqrestore); |
| |
| /* Run PCM ioctl ops */ |
| static int snd_pcm_ops_ioctl(struct snd_pcm_substream *substream, |
| unsigned cmd, void *arg) |
| { |
| if (substream->ops->ioctl) |
| return substream->ops->ioctl(substream, cmd, arg); |
| else |
| return snd_pcm_lib_ioctl(substream, cmd, arg); |
| } |
| |
| int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info) |
| { |
| 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)); |
| |
| 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; |
| |
| if (substream->ops->mmap || |
| (substream->dma_buffer.dev.type != SNDRV_DMA_TYPE_DEV && |
| substream->dma_buffer.dev.type != SNDRV_DMA_TYPE_DEV_UC)) |
| return true; |
| |
| return dma_can_mmap(substream->dma_buffer.dev.dev); |
| } |
| |
| static int constrain_mask_params(struct snd_pcm_substream *substream, |
| struct snd_pcm_hw_params *params) |
| { |
| struct snd_pcm_hw_constraints *constrs = |
| &substream->runtime->hw_constraints; |
| struct snd_mask *m; |
| unsigned int k; |
| struct snd_mask old_mask; |
| int changed; |
| |
| 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; |
| |
| /* This parameter is not requested to change by a caller. */ |
| if (!(params->rmask & (1 << k))) |
| continue; |
| |
| if (trace_hw_mask_param_enabled()) |
| old_mask = *m; |
| |
| changed = snd_mask_refine(m, constrs_mask(constrs, k)); |
| if (changed < 0) |
| return changed; |
| if (changed == 0) |
| continue; |
| |
| /* Set corresponding flag so that the caller gets it. */ |
| trace_hw_mask_param(substream, k, 0, &old_mask, m); |
| params->cmask |= 1 << k; |
| } |
| |
| return 0; |
| } |
| |
| static int constrain_interval_params(struct snd_pcm_substream *substream, |
| struct snd_pcm_hw_params *params) |
| { |
| struct snd_pcm_hw_constraints *constrs = |
| &substream->runtime->hw_constraints; |
| struct snd_interval *i; |
| unsigned int k; |
| struct snd_interval old_interval; |
| int 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; |
| |
| /* This parameter is not requested to change by a caller. */ |
| if (!(params->rmask & (1 << k))) |
| continue; |
| |
| if (trace_hw_interval_param_enabled()) |
| old_interval = *i; |
| |
| changed = snd_interval_refine(i, constrs_interval(constrs, k)); |
| if (changed < 0) |
| return changed; |
| if (changed == 0) |
| continue; |
| |
| /* Set corresponding flag so that the caller gets it. */ |
| trace_hw_interval_param(substream, k, 0, &old_interval, i); |
| params->cmask |= 1 << k; |
| } |
| |
| return 0; |
| } |
| |
| static int constrain_params_by_rules(struct snd_pcm_substream *substream, |
| struct snd_pcm_hw_params *params) |
| { |
| struct snd_pcm_hw_constraints *constrs = |
| &substream->runtime->hw_constraints; |
| unsigned int k; |
| unsigned int *rstamps; |
| unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1]; |
| unsigned int stamp; |
| struct snd_pcm_hw_rule *r; |
| unsigned int d; |
| struct snd_mask old_mask; |
| struct snd_interval old_interval; |
| bool again; |
| int changed, err = 0; |
| |
| /* |
| * Each application of rule has own sequence number. |
| * |
| * Each member of 'rstamps' array represents the sequence number of |
| * recent application of corresponding rule. |
| */ |
| rstamps = kcalloc(constrs->rules_num, sizeof(unsigned int), GFP_KERNEL); |
| if (!rstamps) |
| return -ENOMEM; |
| |
| /* |
| * Each member of 'vstamps' array represents the sequence number of |
| * recent application of rule in which corresponding parameters were |
| * changed. |
| * |
| * In initial state, elements corresponding to parameters requested by |
| * a caller is 1. For unrequested parameters, corresponding members |
| * have 0 so that the parameters are never changed anymore. |
| */ |
| for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) |
| vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0; |
| |
| /* Due to the above design, actual sequence number starts at 2. */ |
| stamp = 2; |
| retry: |
| /* Apply all rules in order. */ |
| again = false; |
| for (k = 0; k < constrs->rules_num; k++) { |
| r = &constrs->rules[k]; |
| |
| /* |
| * Check condition bits of this rule. When the rule has |
| * some condition bits, parameter without the bits is |
| * never processed. SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP |
| * is an example of the condition bits. |
| */ |
| if (r->cond && !(r->cond & params->flags)) |
| continue; |
| |
| /* |
| * The 'deps' array includes maximum three dependencies |
| * to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fourth |
| * member of this array is a sentinel and should be |
| * negative value. |
| * |
| * This rule should be processed in this time when dependent |
| * parameters were changed at former applications of the other |
| * rules. |
| */ |
| for (d = 0; r->deps[d] >= 0; d++) { |
| if (vstamps[r->deps[d]] > rstamps[k]) |
| break; |
| } |
| if (r->deps[d] < 0) |
| continue; |
| |
| if (trace_hw_mask_param_enabled()) { |
| if (hw_is_mask(r->var)) |
| old_mask = *hw_param_mask(params, r->var); |
| } |
| if (trace_hw_interval_param_enabled()) { |
| if (hw_is_interval(r->var)) |
| old_interval = *hw_param_interval(params, r->var); |
| } |
| |
| changed = r->func(params, r); |
| if (changed < 0) { |
| err = changed; |
| goto out; |
| } |
| |
| /* |
| * When the parameter is changed, notify it to the caller |
| * by corresponding returned bit, then preparing for next |
| * iteration. |
| */ |
| if (changed && r->var >= 0) { |
| if (hw_is_mask(r->var)) { |
| trace_hw_mask_param(substream, r->var, |
| k + 1, &old_mask, |
| hw_param_mask(params, r->var)); |
| } |
| if (hw_is_interval(r->var)) { |
| trace_hw_interval_param(substream, r->var, |
| k + 1, &old_interval, |
| hw_param_interval(params, r->var)); |
| } |
| |
| params->cmask |= (1 << r->var); |
| vstamps[r->var] = stamp; |
| again = true; |
| } |
| |
| rstamps[k] = stamp++; |
| } |
| |
| /* Iterate to evaluate all rules till no parameters are changed. */ |
| if (again) |
| goto retry; |
| |
| out: |
| kfree(rstamps); |
| return err; |
| } |
| |
| static int fixup_unreferenced_params(struct snd_pcm_substream *substream, |
| struct snd_pcm_hw_params *params) |
| { |
| const struct snd_interval *i; |
| const struct snd_mask *m; |
| int err; |
| |
| if (!params->msbits) { |
| i = hw_param_interval_c(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_c(params, SNDRV_PCM_HW_PARAM_RATE); |
| if (snd_interval_single(i)) { |
| params->rate_num = snd_interval_value(i); |
| params->rate_den = 1; |
| } |
| } |
| |
| if (!params->fifo_size) { |
| m = hw_param_mask_c(params, SNDRV_PCM_HW_PARAM_FORMAT); |
| i = hw_param_interval_c(params, SNDRV_PCM_HW_PARAM_CHANNELS); |
| if (snd_mask_single(m) && snd_interval_single(i)) { |
| err = snd_pcm_ops_ioctl(substream, |
| SNDRV_PCM_IOCTL1_FIFO_SIZE, |
| params); |
| if (err < 0) |
| return err; |
| } |
| } |
| |
| if (!params->info) { |
| params->info = substream->runtime->hw.info; |
| params->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); |
| } |
| |
| return 0; |
| } |
| |
| int snd_pcm_hw_refine(struct snd_pcm_substream *substream, |
| struct snd_pcm_hw_params *params) |
| { |
| int err; |
| |
| 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; |
| } |
| |
| err = constrain_mask_params(substream, params); |
| if (err < 0) |
| return err; |
| |
| err = constrain_interval_params(substream, params); |
| if (err < 0) |
| return err; |
| |
| err = constrain_params_by_rules(substream, params); |
| if (err < 0) |
| return err; |
| |
| 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 (err < 0) |
| goto end; |
| |
| err = fixup_unreferenced_params(substream, params); |
| if (err < 0) |
| goto end; |
| |
| if (copy_to_user(_params, params, sizeof(*params))) |
| err = -EFAULT; |
| end: |
| 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 void snd_pcm_sync_stop(struct snd_pcm_substream *substream) |
| { |
| if (substream->runtime->stop_operating) { |
| substream->runtime->stop_operating = false; |
| if (substream->ops->sync_stop) |
| substream->ops->sync_stop(substream); |
| else if (substream->pcm->card->sync_irq > 0) |
| synchronize_irq(substream->pcm->card->sync_irq); |
| } |
| } |
| |
| /** |
| * snd_pcm_hw_param_choose - choose a configuration defined by @params |
| * @pcm: PCM instance |
| * @params: the hw_params instance |
| * |
| * Choose one configuration from configuration space defined by @params. |
| * The configuration chosen is that obtained fixing in this order: |
| * first access, first format, first subformat, min channels, |
| * min rate, min period time, max buffer size, min tick time |
| * |
| * Return: Zero if successful, or a negative error code on failure. |
| */ |
| static int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm, |
| struct snd_pcm_hw_params *params) |
| { |
| static const int vars[] = { |
| SNDRV_PCM_HW_PARAM_ACCESS, |
| SNDRV_PCM_HW_PARAM_FORMAT, |
| SNDRV_PCM_HW_PARAM_SUBFORMAT, |
| SNDRV_PCM_HW_PARAM_CHANNELS, |
| SNDRV_PCM_HW_PARAM_RATE, |
| SNDRV_PCM_HW_PARAM_PERIOD_TIME, |
| SNDRV_PCM_HW_PARAM_BUFFER_SIZE, |
| SNDRV_PCM_HW_PARAM_TICK_TIME, |
| -1 |
| }; |
| const int *v; |
| struct snd_mask old_mask; |
| struct snd_interval old_interval; |
| int changed; |
| |
| for (v = vars; *v != -1; v++) { |
| /* Keep old parameter to trace. */ |
| if (trace_hw_mask_param_enabled()) { |
| if (hw_is_mask(*v)) |
| old_mask = *hw_param_mask(params, *v); |
| } |
| if (trace_hw_interval_param_enabled()) { |
| if (hw_is_interval(*v)) |
| old_interval = *hw_param_interval(params, *v); |
| } |
| if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE) |
| changed = snd_pcm_hw_param_first(pcm, params, *v, NULL); |
| else |
| changed = snd_pcm_hw_param_last(pcm, params, *v, NULL); |
| if (changed < 0) |
| return changed; |
| if (changed == 0) |
| continue; |
| |
| /* Trace the changed parameter. */ |
| if (hw_is_mask(*v)) { |
| trace_hw_mask_param(pcm, *v, 0, &old_mask, |
| hw_param_mask(params, *v)); |
| } |
| if (hw_is_interval(*v)) { |
| trace_hw_interval_param(pcm, *v, 0, &old_interval, |
| hw_param_interval(params, *v)); |
| } |
| } |
| |
| return 0; |
| } |
| |
| 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; |
| |
| snd_pcm_sync_stop(substream); |
| |
| 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; |
| |
| err = fixup_unreferenced_params(substream, params); |
| if (err < 0) |
| goto _error; |
| |
| if (substream->managed_buffer_alloc) { |
| err = snd_pcm_lib_malloc_pages(substream, |
| params_buffer_bytes(params)); |
| if (err < 0) |
| goto _error; |
| runtime->buffer_changed = err > 0; |
| } |
| |
| 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_user) |
| 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); |
| if (substream->managed_buffer_alloc) |
| snd_pcm_lib_free_pages(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 (err < 0) |
| goto end; |
| |
| if (copy_to_user(_params, params, sizeof(*params))) |
| err = -EFAULT; |
| end: |
| 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; |
| snd_pcm_sync_stop(substream); |
| if (substream->ops->hw_free) |
| result = substream->ops->hw_free(substream); |
| if (substream->managed_buffer_alloc) |
| snd_pcm_lib_free_pages(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; |
| } |
| |
| static inline snd_pcm_uframes_t |
| snd_pcm_calc_delay(struct snd_pcm_substream *substream) |
| { |
| snd_pcm_uframes_t delay; |
| |
| if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
| delay = snd_pcm_playback_hw_avail(substream->runtime); |
| else |
| delay = snd_pcm_capture_avail(substream->runtime); |
| return delay + substream->runtime->delay; |
| } |
| |
| 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; |
| status->avail = snd_pcm_avail(substream); |
| status->delay = snd_pcm_running(substream) ? |
| snd_pcm_calc_delay(substream) : 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 snd_pcm_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; |
| } |
| |
| static void snd_pcm_group_assign(struct snd_pcm_substream *substream, |
| struct snd_pcm_group *new_group) |
| { |
| substream->group = new_group; |
| list_move(&substream->link_list, &new_group->substreams); |
| } |
| |
| /* |
| * Unref and unlock the group, but keep the stream lock; |
| * when the group becomes empty and no longer referred, destroy itself |
| */ |
| static void snd_pcm_group_unref(struct snd_pcm_group *group, |
| struct snd_pcm_substream *substream) |
| { |
| bool do_free; |
| |
| if (!group) |
| return; |
| do_free = refcount_dec_and_test(&group->refs); |
| snd_pcm_group_unlock(group, substream->pcm->nonatomic); |
| if (do_free) |
| kfree(group); |
| } |
| |
| /* |
| * Lock the group inside a stream lock and reference it; |
| * return the locked group object, or NULL if not linked |
| */ |
| static struct snd_pcm_group * |
| snd_pcm_stream_group_ref(struct snd_pcm_substream *substream) |
| { |
| bool nonatomic = substream->pcm->nonatomic; |
| struct snd_pcm_group *group; |
| bool trylock; |
| |
| for (;;) { |
| if (!snd_pcm_stream_linked(substream)) |
| return NULL; |
| group = substream->group; |
| /* block freeing the group object */ |
| refcount_inc(&group->refs); |
| |
| trylock = nonatomic ? mutex_trylock(&group->mutex) : |
| spin_trylock(&group->lock); |
| if (trylock) |
| break; /* OK */ |
| |
| /* re-lock for avoiding ABBA deadlock */ |
| snd_pcm_stream_unlock(substream); |
| snd_pcm_group_lock(group, nonatomic); |
| snd_pcm_stream_lock(substream); |
| |
| /* check the group again; the above opens a small race window */ |
| if (substream->group == group) |
| break; /* OK */ |
| /* group changed, try again */ |
| snd_pcm_group_unref(group, substream); |
| } |
| return group; |
| } |
| |
| /* |
| * Note: call with stream lock |
| */ |
| static int snd_pcm_action(const struct action_ops *ops, |
| struct snd_pcm_substream *substream, |
| int state) |
| { |
| struct snd_pcm_group *group; |
| int res; |
| |
| group = snd_pcm_stream_group_ref(substream); |
| if (group) |
| res = snd_pcm_action_group(ops, substream, state, 1); |
| else |
| res = snd_pcm_action_single(ops, substream, state); |
| snd_pcm_group_unref(group, substream); |
| 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; |
| |
| /* Guarantee the group members won't change during non-atomic action */ |
| 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. |
| * The stream lock must be acquired before calling this function. |
| */ |
| int snd_pcm_start(struct snd_pcm_substream *substream) |
| { |
| return snd_pcm_action(&snd_pcm_action_start, substream, |
| SNDRV_PCM_STATE_RUNNING); |
| } |
| |
| /* take the stream lock and start the streams */ |
| static int snd_pcm_start_lock_irq(struct snd_pcm_substream *substream) |
| { |
| return snd_pcm_action_lock_irq(&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); |
| } |
| runtime->stop_operating = true; |
| 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; |
| |
| snd_pcm_stream_lock_irqsave(substream, flags); |
| if (substream->runtime && snd_pcm_running(substream)) |
| __snd_pcm_xrun(substream); |
| snd_pcm_stream_unlock_irqrestore(substream, flags); |
| return 0; |
| } |
| 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 a negative error code. |
| */ |
| static int snd_pcm_suspend(struct snd_pcm_substream *substream) |
| { |
| int err; |
| unsigned long flags; |
| |
| 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; |
| } |
| |
| /** |
| * 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); |
| snd_pcm_sync_stop(substream); |
| } |
| |
| 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) |
| { |
| return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0); |
| } |
| |
| #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_pcm_runtime *runtime = substream->runtime; |
| int result; |
| |
| 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: |
| __snd_pcm_xrun(substream); |
| result = 0; |
| break; |
| default: |
| result = -EBADFD; |
| } |
| snd_pcm_stream_unlock_irq(substream); |
| 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 = snd_pcm_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; |
| snd_pcm_sync_stop(substream); |
| 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 f_flags; |
| |
| if (file) |
| f_flags = file->f_flags; |
| else |
| f_flags = substream->f_flags; |
| |
| snd_pcm_stream_lock_irq(substream); |
| switch (substream->runtime->status->state) { |
| case SNDRV_PCM_STATE_PAUSED: |
| snd_pcm_pause(substream, 0); |
| /* fallthru */ |
| case SNDRV_PCM_STATE_SUSPENDED: |
| snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); |
| break; |
| } |
| snd_pcm_stream_unlock_irq(substream); |
| |
| return snd_pcm_action_nonatomic(&snd_pcm_action_prepare, |
| substream, f_flags); |
| } |
| |
| /* |
| * 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; |
| 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); |
| } |
| } |
| |
| 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 |
| }; |
| |
| /* |
| * 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; |
| struct snd_pcm_group *group; |
| wait_queue_entry_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; |
| |
| if (file) { |
| if (file->f_flags & O_NONBLOCK) |
| nonblock = 1; |
| } else if (substream->f_flags & O_NONBLOCK) |
| nonblock = 1; |
| |
| 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; |
| group = snd_pcm_stream_group_ref(substream); |
| 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; |
| } |
| } |
| snd_pcm_group_unref(group, substream); |
| if (!to_check) |
| break; /* all drained */ |
| init_waitqueue_entry(&wait, current); |
| set_current_state(TASK_INTERRUPTIBLE); |
| add_wait_queue(&to_check->sleep, &wait); |
| snd_pcm_stream_unlock_irq(substream); |
| 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(tout); |
| |
| snd_pcm_stream_lock_irq(substream); |
| group = snd_pcm_stream_group_ref(substream); |
| snd_pcm_group_for_each_entry(s, substream) { |
| if (s->runtime == to_check) { |
| remove_wait_queue(&to_check->sleep, &wait); |
| break; |
| } |
| } |
| snd_pcm_group_unref(group, substream); |
| |
| 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); |
| |
| 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) |
| 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); |
| struct snd_pcm *pcm; |
| unsigned int minor; |
| |
| if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major) |
| return false; |
| minor = iminor(inode); |
| pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK); |
| if (!pcm) |
| pcm = snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE); |
| if (!pcm) |
| return false; |
| snd_card_unref(pcm->card); |
| return true; |
| } |
| |
| /* |
| * 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, *target_group; |
| bool nonatomic = substream->pcm->nonatomic; |
| 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; |
| group = kzalloc(sizeof(*group), GFP_KERNEL); |
| if (!group) { |
| res = -ENOMEM; |
| goto _nolock; |
| } |
| snd_pcm_group_init(group); |
| |
| down_write(&snd_pcm_link_rwsem); |
| 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; |
| } |
| |
| snd_pcm_stream_lock_irq(substream); |
| if (!snd_pcm_stream_linked(substream)) { |
| snd_pcm_group_assign(substream, group); |
| group = NULL; /* assigned, don't free this one below */ |
| } |
| target_group = substream->group; |
| snd_pcm_stream_unlock_irq(substream); |
| |
| snd_pcm_group_lock_irq(target_group, nonatomic); |
| snd_pcm_stream_lock(substream1); |
| snd_pcm_group_assign(substream1, target_group); |
| refcount_inc(&target_group->refs); |
| snd_pcm_stream_unlock(substream1); |
| snd_pcm_group_unlock_irq(target_group, nonatomic); |
| _end: |
| up_write(&snd_pcm_link_rwsem); |
| _nolock: |
| kfree(group); |
| _badf: |
| fdput(f); |
| return res; |
| } |
| |
| static void relink_to_local(struct snd_pcm_substream *substream) |
| { |
| snd_pcm_stream_lock(substream); |
| snd_pcm_group_assign(substream, &substream->self_group); |
| snd_pcm_stream_unlock(substream); |
| } |
| |
| static int snd_pcm_unlink(struct snd_pcm_substream *substream) |
| { |
| struct snd_pcm_group *group; |
| bool nonatomic = substream->pcm->nonatomic; |
| bool do_free = false; |
| int res = 0; |
| |
| down_write(&snd_pcm_link_rwsem); |
| |
| if (!snd_pcm_stream_linked(substream)) { |
| res = -EALREADY; |
| goto _end; |
| } |
| |
| group = substream->group; |
| snd_pcm_group_lock_irq(group, nonatomic); |
| |
| relink_to_local(substream); |
| refcount_dec(&group->refs); |
| |
| /* detach the last stream, too */ |
| if (list_is_singular(&group->substreams)) { |
| relink_to_local(list_first_entry(&group->substreams, |
| struct snd_pcm_substream, |
| link_list)); |
| do_free = refcount_dec_and_test(&group->refs); |
| } |
| |
| snd_pcm_group_unlock_irq(group, nonatomic); |
| if (do_free) |
| kfree(group); |
| |
| _end: |
| 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; |
| const struct snd_interval *i = |
| hw_param_interval_c(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 const unsigned int rates[] = { |
| 5512, 8000, 11025, 16000, 22050, 32000, 44100, |
| 48000, 64000, 88200, 96000, 176400, 192000, 352800, 384000 |
| }; |
| |
| 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->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_entry_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; |
| } |
| |
| /* check and update PCM state; return 0 or a negative error |
| * call this inside PCM lock |
| */ |
| static int do_pcm_hwsync(struct snd_pcm_substream *substream) |
| { |
| switch (substream->runtime->status->state) { |
| case SNDRV_PCM_STATE_DRAINING: |
| if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) |
| return -EBADFD; |
| /* Fall through */ |
| case SNDRV_PCM_STATE_RUNNING: |
| return snd_pcm_update_hw_ptr(substream); |
| case SNDRV_PCM_STATE_PREPARED: |
| case SNDRV_PCM_STATE_PAUSED: |
| return 0; |
| case SNDRV_PCM_STATE_SUSPENDED: |
| return -ESTRPIPE; |
| case SNDRV_PCM_STATE_XRUN: |
| return -EPIPE; |
| default: |
| return -EBADFD; |
| } |
| } |
| |
| /* increase the appl_ptr; returns the processed frames or a negative error */ |
| static snd_pcm_sframes_t forward_appl_ptr(struct snd_pcm_substream *substream, |
| snd_pcm_uframes_t frames, |
| snd_pcm_sframes_t avail) |
| { |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| snd_pcm_sframes_t appl_ptr; |
| int ret; |
| |
| if (avail <= 0) |
| return 0; |
| 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; |
| ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); |
| return ret < 0 ? ret : frames; |
| } |
| |
| /* decrease the appl_ptr; returns the processed frames or zero for error */ |
| static snd_pcm_sframes_t rewind_appl_ptr(struct snd_pcm_substream *substream, |
| snd_pcm_uframes_t frames, |
| snd_pcm_sframes_t avail) |
| { |
| struct snd_pcm_runtime *runtime = substream->runtime; |
| snd_pcm_sframes_t appl_ptr; |
| int ret; |
| |
| if (avail <= 0) |
| return 0; |
| if (frames > (snd_pcm_uframes_t)avail) |
| frames = avail; |
| appl_ptr = runtime->control->appl_ptr - frames; |
| if (appl_ptr < 0) |
| appl_ptr += runtime->boundary; |
| ret = pcm_lib_apply_appl_ptr(substream, appl_ptr); |
| /* NOTE: we return zero for errors because PulseAudio gets depressed |
| * upon receiving an error from rewind ioctl and stops processing |
| * any longer. Returning zero means that no rewind is done, so |
| * it's not absolutely wrong to answer like that. |
| */ |
| return ret < 0 ? 0 : frames; |
| } |
| |
| static snd_pcm_sframes_t snd_pcm_rewind(struct snd_pcm_substream *substream, |
| snd_pcm_uframes_t frames) |
| { |
| snd_pcm_sframes_t ret; |
| |
| if (frames == 0) |
| return 0; |
| |
| snd_pcm_stream_lock_irq(substream); |
| ret = do_pcm_hwsync(substream); |
| if (!ret) |
| ret = rewind_appl_ptr(substream, frames, |
| snd_pcm_hw_avail(substream)); |
| snd_pcm_stream_unlock_irq(substream); |
| return ret; |
| } |
| |
| static snd_pcm_sframes_t snd_pcm_forward(struct snd_pcm_substream *substream, |
| snd_pcm_uframes_t frames) |
| { |
| snd_pcm_sframes_t ret; |
| |
| if (frames == 0) |
| return 0; |
| |
| snd_pcm_stream_lock_irq(substream); |
| ret = do_pcm_hwsync(substream); |
| if (!ret) |
| ret = forward_appl_ptr(substream, frames, |
| snd_pcm_avail(substream)); |
| snd_pcm_stream_unlock_irq(substream); |
| return ret; |
| } |
| |
| static int snd_pcm_hwsync(struct snd_pcm_substream *substream) |
| { |
| int err; |
| |
| snd_pcm_stream_lock_irq(substream); |
| err = do_pcm_hwsync(substream); |
| snd_pcm_stream_unlock_irq(substream); |
| return err; |
| } |
| |
| static int snd_pcm_delay(struct snd_pcm_substream *substream, |
| snd_pcm_sframes_t *delay) |
| { |
| int err; |
| snd_pcm_sframes_t n = 0; |
| |
| snd_pcm_stream_lock_irq(substream); |
| err = do_pcm_hwsync(substream); |
| if (!err) |
| n = snd_pcm_calc_delay(substream); |
| snd_pcm_stream_unlock_irq(substream); |
| if (!err) |
| *delay = n; |
| 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)) { |
| err = pcm_lib_apply_appl_ptr(substream, |
| sync_ptr.c.control.appl_ptr); |
| if (err < 0) { |
| snd_pcm_stream_unlock_irq(substream); |
| return err; |
| } |
| } 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_xferi_frames_ioctl(struct snd_pcm_substream *substream, |
| struct snd_xferi __user *_xferi) |
| { |
| struct snd_xferi xferi; |
| 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; |
| if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
| result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames); |
| else |
| result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames); |
| __put_user(result, &_xferi->result); |
| return result < 0 ? result : 0; |
| } |
| |
| static int snd_pcm_xfern_frames_ioctl(struct snd_pcm_substream *substream, |
| struct snd_xfern __user *_xfern) |
| { |
| struct snd_xfern xfern; |
| 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); |
| if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
| result = snd_pcm_lib_writev(substream, bufs, xfern.frames); |
| else |
| result = snd_pcm_lib_readv(substream, bufs, xfern.frames); |
| kfree(bufs); |
| __put_user(result, &_xfern->result); |
| return result < 0 ? result : 0; |
| } |
| |
| static int snd_pcm_rewind_ioctl(struct snd_pcm_substream *substream, |
| snd_pcm_uframes_t __user *_frames) |
| { |
| snd_pcm_uframes_t frames; |
| snd_pcm_sframes_t result; |
| |
| if (get_user(frames, _frames)) |
| return -EFAULT; |
| if (put_user(0, _frames)) |
| return -EFAULT; |
| result = snd_pcm_rewind(substream, frames); |
| __put_user(result, _frames); |
| return result < 0 ? result : 0; |
| } |
| |
| static int snd_pcm_forward_ioctl(struct snd_pcm_substream *substream, |
| snd_pcm_uframes_t __user *_frames) |
| { |
| snd_pcm_uframes_t frames; |
| snd_pcm_sframes_t result; |
| |
| if (get_user(frames, _frames)) |
| return -EFAULT; |
| if (put_user(0, _frames)) |
| return -EFAULT; |
| result = snd_pcm_forward(substream, frames); |
| __put_user(result, _frames); |
| return result < 0 ? result : 0; |
| } |
| |
| static int snd_pcm_common_ioctl(struct file *file, |
| struct snd_pcm_substream *substream, |
| unsigned int cmd, void __user *arg) |
| { |
| struct snd_pcm_file *pcm_file = file->private_data; |
| int res; |
| |
| if (PCM_RUNTIME_CHECK(substream)) |
| return -ENXIO; |
| |
| res = snd_power_wait(substream->pcm->card, SNDRV_CTL_POWER_D0); |
| if (res < 0) |
| return res; |
| |
| 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_USER_PVERSION: |
| if (get_user(pcm_file->user_pversion, |
| (unsigned int __user *)arg)) |
| return -EFAULT; |
| return 0; |
| 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_start_lock_irq(substream); |
| 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: |
| { |
| snd_pcm_sframes_t delay; |
| snd_pcm_sframes_t __user *res = arg; |
| int err; |
| |
| err = snd_pcm_delay(substream, &delay); |
| if (err) |
| return err; |
| if (put_user(delay, res)) |
| return -EFAULT; |
| return 0; |
| } |
| 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: |
| return snd_pcm_action_lock_irq(&snd_pcm_action_pause, |
| substream, |
| (int)(unsigned long)arg); |
| case SNDRV_PCM_IOCTL_WRITEI_FRAMES: |
| case SNDRV_PCM_IOCTL_READI_FRAMES: |
| return snd_pcm_xferi_frames_ioctl(substream, arg); |
| case SNDRV_PCM_IOCTL_WRITEN_FRAMES: |
| case SNDRV_PCM_IOCTL_READN_FRAMES: |
| return snd_pcm_xfern_frames_ioctl(substream, arg); |
| case SNDRV_PCM_IOCTL_REWIND: |
| return snd_pcm_rewind_ioctl(substream, arg); |
| case SNDRV_PCM_IOCTL_FORWARD: |
| return snd_pcm_forward_ioctl(substream, arg); |
| } |
| pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd); |
| return -ENOTTY; |
| } |
| |
| static long snd_pcm_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_common_ioctl(file, pcm_file->substream, cmd, |
| (void __user *)arg); |
| } |
| |
| /** |
| * snd_pcm_kernel_ioctl - Execute PCM ioctl in the kernel-space |
| * @substream: PCM substream |
| * @cmd: IOCTL cmd |
| * @arg: IOCTL argument |
| * |
| * The function is provided primarily for OSS layer and USB gadget drivers, |
| * and it allows only the limited set of ioctls (hw_params, sw_params, |
| * prepare, start, drain, drop, forward). |
| */ |
| int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, |
| unsigned int cmd, void *arg) |
| { |
| snd_pcm_uframes_t *frames = arg; |
| snd_pcm_sframes_t result; |
| |
| switch (cmd) { |
| case SNDRV_PCM_IOCTL_FORWARD: |
| { |
| /* provided only for OSS; capture-only and no value returned */ |
| if (substream->stream != SNDRV_PCM_STREAM_CAPTURE) |
| return -EINVAL; |
| result = snd_pcm_forward(substream, *frames); |
| return result < 0 ? result : 0; |
| } |
| case SNDRV_PCM_IOCTL_HW_PARAMS: |
| return snd_pcm_hw_params(substream, arg); |
| case SNDRV_PCM_IOCTL_SW_PARAMS: |
| return snd_pcm_sw_params(substream, arg); |
| case SNDRV_PCM_IOCTL_PREPARE: |
| return snd_pcm_prepare(substream, NULL); |
| case SNDRV_PCM_IOCTL_START: |
| return snd_pcm_start_lock_irq(substream); |
| case SNDRV_PCM_IOCTL_DRAIN: |
| return snd_pcm_drain(substream, NULL); |
| case SNDRV_PCM_IOCTL_DROP: |
| return snd_pcm_drop(substream); |
| case SNDRV_PCM_IOCTL_DELAY: |
| return snd_pcm_delay(substream, frames); |
| default: |
| return -EINVAL; |
| } |
| } |
| 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_array(to->nr_segs, sizeof(void *), 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_array(from->nr_segs, sizeof(void *), 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 __poll_t snd_pcm_poll(struct file *file, poll_table *wait) |
| { |
| struct snd_pcm_file *pcm_file; |
| struct snd_pcm_substream *substream; |
| struct snd_pcm_runtime *runtime; |
| __poll_t mask, ok; |
| snd_pcm_uframes_t avail; |
| |
| pcm_file = file->private_data; |
| |
| substream = pcm_file->substream; |
| if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
| ok = EPOLLOUT | EPOLLWRNORM; |
| else |
| ok = EPOLLIN | EPOLLRDNORM; |
| if (PCM_RUNTIME_CHECK(substream)) |
| return ok | EPOLLERR; |
| |
| runtime = substream->runtime; |
| poll_wait(file, &runtime->sleep, wait); |
| |
| mask = 0; |
| snd_pcm_stream_lock_irq(substream); |
| avail = snd_pcm_avail(substream); |
| 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 = ok; |
| break; |
| case SNDRV_PCM_STATE_DRAINING: |
| if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) { |
| mask = ok; |
| if (!avail) |
| mask |= EPOLLERR; |
| } |
| break; |
| default: |
| mask = ok | EPOLLERR; |
| 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 vm_fault_t snd_pcm_mmap_status_fault(struct vm_fault *vmf) |
| { |
| struct snd_pcm_substream *substream = vmf->vma->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 vm_fault_t snd_pcm_mmap_control_fault(struct vm_fault *vmf) |
| { |
| struct snd_pcm_substream *substream = vmf->vma->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; |
| } |
| |
| static bool pcm_status_mmap_allowed(struct snd_pcm_file *pcm_file) |
| { |
| if (pcm_file->no_compat_mmap) |
| return false; |
| /* See pcm_control_mmap_allowed() below. |
| * Since older alsa-lib requires both status and control mmaps to be |
| * coupled, we have to disable the status mmap for old alsa-lib, too. |
| */ |
| if (pcm_file->user_pversion < SNDRV_PROTOCOL_VERSION(2, 0, 14) && |
| (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR)) |
| return false; |
| return true; |
| } |
| |
| static bool pcm_control_mmap_allowed(struct snd_pcm_file *pcm_file) |
| { |
| if (pcm_file->no_compat_mmap) |
| return false; |
| /* Disallow the control mmap when SYNC_APPLPTR flag is set; |
| * it enforces the user-space to fall back to snd_pcm_sync_ptr(), |
| * thus it effectively assures the manual update of appl_ptr. |
| */ |
| if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_SYNC_APPLPTR) |
| return false; |
| return true; |
| } |
| |
| #else /* ! coherent mmap */ |
| /* |
| * don't support mmap for status and control records. |
| */ |
| #define pcm_status_mmap_allowed(pcm_file) false |
| #define pcm_control_mmap_allowed(pcm_file) false |
| |
| 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; |
| |
| switch (substream->dma_buffer.dev.type) { |
| #ifdef CONFIG_SND_DMA_SGBUF |
| case SNDRV_DMA_TYPE_DEV_SG: |
| case SNDRV_DMA_TYPE_DEV_UC_SG: |
| return snd_pcm_sgbuf_ops_page(substream, ofs); |
| #endif /* CONFIG_SND_DMA_SGBUF */ |
| case SNDRV_DMA_TYPE_VMALLOC: |
| return vmalloc_to_page(vaddr); |
| default: |
| return virt_to_page(vaddr); |
| } |
| } |
| |
| /* |
| * fault callback for mmapping a RAM page |
| */ |
| static vm_fault_t snd_pcm_mmap_data_fault(struct vm_fault *vmf) |
| { |
| struct snd_pcm_substream *substream = vmf->vma->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 (IS_ENABLED(CONFIG_HAS_DMA) && !substream->ops->page && |
| (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV || |
| substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_UC)) |
| 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_status_mmap_allowed(pcm_file)) |
| return -ENXIO; |
| return snd_pcm_mmap_status(substream, file, area); |
| case SNDRV_PCM_MMAP_OFFSET_CONTROL: |
| if (!pcm_control_mmap_allowed(pcm_file)) |
| 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); |
| if (err < 0) |
| goto out_old; |
| |
| err = fixup_unreferenced_params(substream, params); |
| if (err < 0) |
| goto out_old; |
| |
| snd_pcm_hw_convert_to_old_params(oparams, params); |
| if (copy_to_user(_oparams, oparams, sizeof(*oparams))) |
| err = -EFAULT; |
| out_old: |
| 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); |
| if (err < 0) |
| goto out_old; |
| |
| snd_pcm_hw_convert_to_old_params(oparams, params); |
| if (copy_to_user(_oparams, oparams, sizeof(*oparams))) |
| err = -EFAULT; |
| out_old: |
| 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_poll, |
| .unlocked_ioctl = snd_pcm_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_poll, |
| .unlocked_ioctl = snd_pcm_ioctl, |
| .compat_ioctl = snd_pcm_ioctl_compat, |
| .mmap = snd_pcm_mmap, |
| .fasync = snd_pcm_fasync, |
| .get_unmapped_area = snd_pcm_get_unmapped_area, |
| } |
| }; |