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-rw-r--r--sound/core/pcm_native.c4142
1 files changed, 4142 insertions, 0 deletions
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
new file mode 100644
index 000000000..9238abbfb
--- /dev/null
+++ b/sound/core/pcm_native.c
@@ -0,0 +1,4142 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Digital Audio (PCM) abstract layer
+ * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
+ */
+
+#include <linux/compat.h>
+#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_unlock - 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);
+
+static void snd_pcm_stream_lock_nested(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_group *group = &substream->self_group;
+
+ if (substream->pcm->nonatomic)
+ mutex_lock_nested(&group->mutex, SINGLE_DEPTH_NESTING);
+ else
+ spin_lock_nested(&group->lock, SINGLE_DEPTH_NESTING);
+}
+
+/**
+ * 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);
+
+unsigned long _snd_pcm_stream_lock_irqsave_nested(struct snd_pcm_substream *substream)
+{
+ unsigned long flags = 0;
+ if (substream->pcm->nonatomic)
+ mutex_lock_nested(&substream->self_group.mutex,
+ SINGLE_DEPTH_NESTING);
+ else
+ spin_lock_irqsave_nested(&substream->self_group.lock, flags,
+ SINGLE_DEPTH_NESTING);
+ return flags;
+}
+EXPORT_SYMBOL_GPL(_snd_pcm_stream_lock_irqsave_nested);
+
+/**
+ * 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;
+ strscpy(info->id, pcm->id, sizeof(info->id));
+ strscpy(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;
+ strscpy(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;
+}
+
+/* macro for simplified cast */
+#define PARAM_MASK_BIT(b) (1U << (__force int)(b))
+
+static bool hw_support_mmap(struct snd_pcm_substream *substream)
+{
+ struct snd_dma_buffer *dmabuf;
+
+ if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_MMAP))
+ return false;
+
+ if (substream->ops->mmap || substream->ops->page)
+ return true;
+
+ dmabuf = snd_pcm_get_dma_buf(substream);
+ if (!dmabuf)
+ dmabuf = &substream->dma_buffer;
+ switch (dmabuf->dev.type) {
+ case SNDRV_DMA_TYPE_UNKNOWN:
+ /* we can't know the device, so just assume that the driver does
+ * everything right
+ */
+ return true;
+ case SNDRV_DMA_TYPE_CONTINUOUS:
+ case SNDRV_DMA_TYPE_VMALLOC:
+ return true;
+ default:
+ return dma_can_mmap(dmabuf->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 & PARAM_MASK_BIT(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 |= PARAM_MASK_BIT(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 & PARAM_MASK_BIT(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 |= PARAM_MASK_BIT(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 & PARAM_MASK_BIT(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 four dependencies
+ * to SNDRV_PCM_HW_PARAM_XXXs for this rule. The fifth
+ * 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 |= PARAM_MASK_BIT(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 & PARAM_MASK_BIT(SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
+ params->msbits = 0;
+ if (params->rmask & PARAM_MASK_BIT(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,
+ snd_pcm_state_t state)
+{
+ snd_pcm_stream_lock_irq(substream);
+ if (substream->runtime->state != SNDRV_PCM_STATE_DISCONNECTED)
+ __snd_pcm_set_state(substream->runtime, 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
+}
+
+void snd_pcm_sync_stop(struct snd_pcm_substream *substream, bool sync_irq)
+{
+ if (substream->runtime && substream->runtime->stop_operating) {
+ substream->runtime->stop_operating = false;
+ if (substream->ops && substream->ops->sync_stop)
+ substream->ops->sync_stop(substream);
+ else if (sync_irq && substream->pcm->card->sync_irq > 0)
+ synchronize_irq(substream->pcm->card->sync_irq);
+ }
+}
+
+/**
+ * snd_pcm_hw_params_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;
+}
+
+/* acquire buffer_mutex; if it's in r/w operation, return -EBUSY, otherwise
+ * block the further r/w operations
+ */
+static int snd_pcm_buffer_access_lock(struct snd_pcm_runtime *runtime)
+{
+ if (!atomic_dec_unless_positive(&runtime->buffer_accessing))
+ return -EBUSY;
+ mutex_lock(&runtime->buffer_mutex);
+ return 0; /* keep buffer_mutex, unlocked by below */
+}
+
+/* release buffer_mutex and clear r/w access flag */
+static void snd_pcm_buffer_access_unlock(struct snd_pcm_runtime *runtime)
+{
+ mutex_unlock(&runtime->buffer_mutex);
+ atomic_inc(&runtime->buffer_accessing);
+}
+
+#if IS_ENABLED(CONFIG_SND_PCM_OSS)
+#define is_oss_stream(substream) ((substream)->oss.oss)
+#else
+#define is_oss_stream(substream) false
+#endif
+
+static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params)
+{
+ struct snd_pcm_runtime *runtime;
+ int err, usecs;
+ unsigned int bits;
+ snd_pcm_uframes_t frames;
+
+ if (PCM_RUNTIME_CHECK(substream))
+ return -ENXIO;
+ runtime = substream->runtime;
+ err = snd_pcm_buffer_access_lock(runtime);
+ if (err < 0)
+ return err;
+ snd_pcm_stream_lock_irq(substream);
+ switch (runtime->state) {
+ case SNDRV_PCM_STATE_OPEN:
+ case SNDRV_PCM_STATE_SETUP:
+ case SNDRV_PCM_STATE_PREPARED:
+ if (!is_oss_stream(substream) &&
+ atomic_read(&substream->mmap_count))
+ err = -EBADFD;
+ break;
+ default:
+ err = -EBADFD;
+ break;
+ }
+ snd_pcm_stream_unlock_irq(substream);
+ if (err)
+ goto unlock;
+
+ snd_pcm_sync_stop(substream, true);
+
+ 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) {
+ size_t size = runtime->dma_bytes;
+
+ if (runtime->info & SNDRV_PCM_INFO_MMAP)
+ size = PAGE_ALIGN(size);
+ memset(runtime->dma_area, 0, size);
+ }
+
+ snd_pcm_timer_resolution_change(substream);
+ snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP);
+
+ if (cpu_latency_qos_request_active(&substream->latency_pm_qos_req))
+ cpu_latency_qos_remove_request(&substream->latency_pm_qos_req);
+ usecs = period_to_usecs(runtime);
+ if (usecs >= 0)
+ cpu_latency_qos_add_request(&substream->latency_pm_qos_req,
+ usecs);
+ err = 0;
+ _error:
+ if (err) {
+ /* 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);
+ }
+ unlock:
+ snd_pcm_buffer_access_unlock(runtime);
+ 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 do_hw_free(struct snd_pcm_substream *substream)
+{
+ int result = 0;
+
+ snd_pcm_sync_stop(substream, true);
+ if (substream->ops->hw_free)
+ result = substream->ops->hw_free(substream);
+ if (substream->managed_buffer_alloc)
+ snd_pcm_lib_free_pages(substream);
+ return result;
+}
+
+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;
+ result = snd_pcm_buffer_access_lock(runtime);
+ if (result < 0)
+ return result;
+ snd_pcm_stream_lock_irq(substream);
+ switch (runtime->state) {
+ case SNDRV_PCM_STATE_SETUP:
+ case SNDRV_PCM_STATE_PREPARED:
+ if (atomic_read(&substream->mmap_count))
+ result = -EBADFD;
+ break;
+ default:
+ result = -EBADFD;
+ break;
+ }
+ snd_pcm_stream_unlock_irq(substream);
+ if (result)
+ goto unlock;
+ result = do_hw_free(substream);
+ snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN);
+ cpu_latency_qos_remove_request(&substream->latency_pm_qos_req);
+ unlock:
+ snd_pcm_buffer_access_unlock(runtime);
+ 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->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(&params, _params, sizeof(params)))
+ return -EFAULT;
+ err = snd_pcm_sw_params(substream, &params);
+ if (copy_to_user(_params, &params, 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_status64(struct snd_pcm_substream *substream,
+ struct snd_pcm_status64 *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->state;
+ status->suspended_state = runtime->suspended_state;
+ if (status->state == SNDRV_PCM_STATE_OPEN)
+ goto _end;
+ status->trigger_tstamp_sec = runtime->trigger_tstamp.tv_sec;
+ status->trigger_tstamp_nsec = runtime->trigger_tstamp.tv_nsec;
+ if (snd_pcm_running(substream)) {
+ snd_pcm_update_hw_ptr(substream);
+ if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
+ status->tstamp_sec = runtime->status->tstamp.tv_sec;
+ status->tstamp_nsec =
+ runtime->status->tstamp.tv_nsec;
+ status->driver_tstamp_sec =
+ runtime->driver_tstamp.tv_sec;
+ status->driver_tstamp_nsec =
+ runtime->driver_tstamp.tv_nsec;
+ status->audio_tstamp_sec =
+ runtime->status->audio_tstamp.tv_sec;
+ status->audio_tstamp_nsec =
+ runtime->status->audio_tstamp.tv_nsec;
+ 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) {
+ struct timespec64 tstamp;
+
+ snd_pcm_gettime(runtime, &tstamp);
+ status->tstamp_sec = tstamp.tv_sec;
+ status->tstamp_nsec = tstamp.tv_nsec;
+ }
+ }
+ _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_user64(struct snd_pcm_substream *substream,
+ struct snd_pcm_status64 __user * _status,
+ bool ext)
+{
+ struct snd_pcm_status64 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_status64(substream, &status);
+ if (res < 0)
+ return res;
+ if (copy_to_user(_status, &status, sizeof(status)))
+ return -EFAULT;
+ return 0;
+}
+
+static int snd_pcm_status_user32(struct snd_pcm_substream *substream,
+ struct snd_pcm_status32 __user * _status,
+ bool ext)
+{
+ struct snd_pcm_status64 status64;
+ struct snd_pcm_status32 status32;
+ int res;
+
+ memset(&status64, 0, sizeof(status64));
+ memset(&status32, 0, sizeof(status32));
+ /*
+ * with extension, parameters are read/write,
+ * get audio_tstamp_data from user,
+ * ignore rest of status structure
+ */
+ if (ext && get_user(status64.audio_tstamp_data,
+ (u32 __user *)(&_status->audio_tstamp_data)))
+ return -EFAULT;
+ res = snd_pcm_status64(substream, &status64);
+ if (res < 0)
+ return res;
+
+ status32 = (struct snd_pcm_status32) {
+ .state = status64.state,
+ .trigger_tstamp_sec = status64.trigger_tstamp_sec,
+ .trigger_tstamp_nsec = status64.trigger_tstamp_nsec,
+ .tstamp_sec = status64.tstamp_sec,
+ .tstamp_nsec = status64.tstamp_nsec,
+ .appl_ptr = status64.appl_ptr,
+ .hw_ptr = status64.hw_ptr,
+ .delay = status64.delay,
+ .avail = status64.avail,
+ .avail_max = status64.avail_max,
+ .overrange = status64.overrange,
+ .suspended_state = status64.suspended_state,
+ .audio_tstamp_data = status64.audio_tstamp_data,
+ .audio_tstamp_sec = status64.audio_tstamp_sec,
+ .audio_tstamp_nsec = status64.audio_tstamp_nsec,
+ .driver_tstamp_sec = status64.audio_tstamp_sec,
+ .driver_tstamp_nsec = status64.audio_tstamp_nsec,
+ .audio_tstamp_accuracy = status64.audio_tstamp_accuracy,
+ };
+
+ if (copy_to_user(_status, &status32, sizeof(status32)))
+ 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->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;
+}
+
+#define ACTION_ARG_IGNORE (__force snd_pcm_state_t)0
+
+struct action_ops {
+ int (*pre_action)(struct snd_pcm_substream *substream,
+ snd_pcm_state_t state);
+ int (*do_action)(struct snd_pcm_substream *substream,
+ snd_pcm_state_t state);
+ void (*undo_action)(struct snd_pcm_substream *substream,
+ snd_pcm_state_t state);
+ void (*post_action)(struct snd_pcm_substream *substream,
+ snd_pcm_state_t 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,
+ snd_pcm_state_t state,
+ bool stream_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 (s != substream) {
+ if (!stream_lock)
+ mutex_lock_nested(&s->runtime->buffer_mutex, depth);
+ else 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:
+ /* unlock streams */
+ snd_pcm_group_for_each_entry(s1, substream) {
+ if (s1 != substream) {
+ if (!stream_lock)
+ mutex_unlock(&s1->runtime->buffer_mutex);
+ else 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,
+ snd_pcm_state_t 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,
+ snd_pcm_state_t 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, true);
+ 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,
+ snd_pcm_state_t 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,
+ snd_pcm_state_t state)
+{
+ int res;
+
+ /* Guarantee the group members won't change during non-atomic action */
+ down_read(&snd_pcm_link_rwsem);
+ res = snd_pcm_buffer_access_lock(substream->runtime);
+ if (res < 0)
+ goto unlock;
+ if (snd_pcm_stream_linked(substream))
+ res = snd_pcm_action_group(ops, substream, state, false);
+ else
+ res = snd_pcm_action_single(ops, substream, state);
+ snd_pcm_buffer_access_unlock(substream->runtime);
+ unlock:
+ up_read(&snd_pcm_link_rwsem);
+ return res;
+}
+
+/*
+ * start callbacks
+ */
+static int snd_pcm_pre_start(struct snd_pcm_substream *substream,
+ snd_pcm_state_t state)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ if (runtime->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,
+ snd_pcm_state_t 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,
+ snd_pcm_state_t state)
+{
+ if (substream->runtime->trigger_master == substream) {
+ substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
+ substream->runtime->stop_operating = true;
+ }
+}
+
+static void snd_pcm_post_start(struct snd_pcm_substream *substream,
+ snd_pcm_state_t 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;
+ __snd_pcm_set_state(runtime, 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,
+ snd_pcm_state_t state)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ if (runtime->state == SNDRV_PCM_STATE_OPEN)
+ return -EBADFD;
+ runtime->trigger_master = substream;
+ return 0;
+}
+
+static int snd_pcm_do_stop(struct snd_pcm_substream *substream,
+ snd_pcm_state_t state)
+{
+ if (substream->runtime->trigger_master == substream &&
+ snd_pcm_running(substream)) {
+ substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
+ substream->runtime->stop_operating = true;
+ }
+ return 0; /* unconditionally stop all substreams */
+}
+
+static void snd_pcm_post_stop(struct snd_pcm_substream *substream,
+ snd_pcm_state_t state)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ if (runtime->state != state) {
+ snd_pcm_trigger_tstamp(substream);
+ __snd_pcm_set_state(runtime, state);
+ snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MSTOP);
+ }
+ wake_up(&runtime->sleep);
+ wake_up(&runtime->tsleep);
+}
+
+static const struct action_ops snd_pcm_action_stop = {
+ .pre_action = snd_pcm_pre_stop,
+ .do_action = snd_pcm_do_stop,
+ .post_action = snd_pcm_post_stop
+};
+
+/**
+ * snd_pcm_stop - try to stop all running streams in the substream group
+ * @substream: the PCM substream instance
+ * @state: PCM state after stopping the stream
+ *
+ * The state of each stream is then changed to the given state unconditionally.
+ *
+ * Return: Zero if successful, or a negative error code.
+ */
+int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state)
+{
+ return snd_pcm_action(&snd_pcm_action_stop, substream, state);
+}
+EXPORT_SYMBOL(snd_pcm_stop);
+
+/**
+ * snd_pcm_drain_done - stop the DMA only when the given stream is playback
+ * @substream: the PCM substream
+ *
+ * After stopping, the state is changed to SETUP.
+ * Unlike snd_pcm_stop(), this affects only the given stream.
+ *
+ * Return: Zero if successful, 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: pass boolean (to start pause or resume) as state argument
+ */
+#define pause_pushed(state) (__force bool)(state)
+
+static int snd_pcm_pre_pause(struct snd_pcm_substream *substream,
+ snd_pcm_state_t state)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
+ return -ENOSYS;
+ if (pause_pushed(state)) {
+ if (runtime->state != SNDRV_PCM_STATE_RUNNING)
+ return -EBADFD;
+ } else if (runtime->state != SNDRV_PCM_STATE_PAUSED)
+ return -EBADFD;
+ runtime->trigger_master = substream;
+ return 0;
+}
+
+static int snd_pcm_do_pause(struct snd_pcm_substream *substream,
+ snd_pcm_state_t state)
+{
+ 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 (pause_pushed(state))
+ 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,
+ pause_pushed(state) ?
+ SNDRV_PCM_TRIGGER_PAUSE_PUSH :
+ SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
+}
+
+static void snd_pcm_undo_pause(struct snd_pcm_substream *substream,
+ snd_pcm_state_t state)
+{
+ if (substream->runtime->trigger_master == substream)
+ substream->ops->trigger(substream,
+ pause_pushed(state) ?
+ SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
+ SNDRV_PCM_TRIGGER_PAUSE_PUSH);
+}
+
+static void snd_pcm_post_pause(struct snd_pcm_substream *substream,
+ snd_pcm_state_t state)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ snd_pcm_trigger_tstamp(substream);
+ if (pause_pushed(state)) {
+ __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_PAUSED);
+ snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MPAUSE);
+ wake_up(&runtime->sleep);
+ wake_up(&runtime->tsleep);
+ } else {
+ __snd_pcm_set_state(runtime, 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, bool push)
+{
+ return snd_pcm_action(&snd_pcm_action_pause, substream,
+ (__force snd_pcm_state_t)push);
+}
+
+static int snd_pcm_pause_lock_irq(struct snd_pcm_substream *substream,
+ bool push)
+{
+ return snd_pcm_action_lock_irq(&snd_pcm_action_pause, substream,
+ (__force snd_pcm_state_t)push);
+}
+
+#ifdef CONFIG_PM
+/* suspend callback: state argument ignored */
+
+static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream,
+ snd_pcm_state_t state)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ switch (runtime->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,
+ snd_pcm_state_t 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);
+ runtime->stop_operating = true;
+ return 0; /* suspend unconditionally */
+}
+
+static void snd_pcm_post_suspend(struct snd_pcm_substream *substream,
+ snd_pcm_state_t state)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ snd_pcm_trigger_tstamp(substream);
+ runtime->suspended_state = runtime->state;
+ runtime->status->suspended_state = runtime->suspended_state;
+ __snd_pcm_set_state(runtime, 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,
+ ACTION_ARG_IGNORE);
+ 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_each_pcm_substream(pcm, stream, substream) {
+ /* FIXME: the open/close code should lock this as well */
+ if (!substream->runtime)
+ 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;
+ }
+
+ for_each_pcm_substream(pcm, stream, substream)
+ snd_pcm_sync_stop(substream, false);
+
+ return 0;
+}
+EXPORT_SYMBOL(snd_pcm_suspend_all);
+
+/* resume callbacks: state argument ignored */
+
+static int snd_pcm_pre_resume(struct snd_pcm_substream *substream,
+ snd_pcm_state_t 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,
+ snd_pcm_state_t state)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ if (runtime->trigger_master != substream)
+ return 0;
+ /* DMA not running previously? */
+ if (runtime->suspended_state != SNDRV_PCM_STATE_RUNNING &&
+ (runtime->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,
+ snd_pcm_state_t 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,
+ snd_pcm_state_t state)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ snd_pcm_trigger_tstamp(substream);
+ __snd_pcm_set_state(runtime, runtime->suspended_state);
+ snd_pcm_timer_notify(substream, SNDRV_TIMER_EVENT_MRESUME);
+}
+
+static const struct action_ops snd_pcm_action_resume = {
+ .pre_action = snd_pcm_pre_resume,
+ .do_action = snd_pcm_do_resume,
+ .undo_action = snd_pcm_undo_resume,
+ .post_action = snd_pcm_post_resume
+};
+
+static int snd_pcm_resume(struct snd_pcm_substream *substream)
+{
+ return snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream,
+ ACTION_ARG_IGNORE);
+}
+
+#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->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
+ */
+/* reset callbacks: state argument ignored */
+static int snd_pcm_pre_reset(struct snd_pcm_substream *substream,
+ snd_pcm_state_t state)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ switch (runtime->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,
+ snd_pcm_state_t 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;
+ snd_pcm_stream_lock_irq(substream);
+ 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;
+ snd_pcm_stream_unlock_irq(substream);
+ return 0;
+}
+
+static void snd_pcm_post_reset(struct snd_pcm_substream *substream,
+ snd_pcm_state_t state)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ snd_pcm_stream_lock_irq(substream);
+ 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);
+ snd_pcm_stream_unlock_irq(substream);
+}
+
+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,
+ ACTION_ARG_IGNORE);
+}
+
+/*
+ * prepare ioctl
+ */
+/* pass f_flags as state argument */
+static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
+ snd_pcm_state_t state)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ int f_flags = (__force int)state;
+
+ if (runtime->state == SNDRV_PCM_STATE_OPEN ||
+ runtime->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,
+ snd_pcm_state_t state)
+{
+ int err;
+ snd_pcm_sync_stop(substream, true);
+ err = substream->ops->prepare(substream);
+ if (err < 0)
+ return err;
+ return snd_pcm_do_reset(substream, state);
+}
+
+static void snd_pcm_post_prepare(struct snd_pcm_substream *substream,
+ snd_pcm_state_t 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->state) {
+ case SNDRV_PCM_STATE_PAUSED:
+ snd_pcm_pause(substream, false);
+ fallthrough;
+ 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,
+ (__force snd_pcm_state_t)f_flags);
+}
+
+/*
+ * drain ioctl
+ */
+
+/* drain init callbacks: state argument ignored */
+static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream,
+ snd_pcm_state_t state)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ switch (runtime->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,
+ snd_pcm_state_t state)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ switch (runtime->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 {
+ __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_SETUP);
+ }
+ break;
+ case SNDRV_PCM_STATE_RUNNING:
+ __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_DRAINING);
+ break;
+ case SNDRV_PCM_STATE_XRUN:
+ __snd_pcm_set_state(runtime, SNDRV_PCM_STATE_SETUP);
+ break;
+ default:
+ break;
+ }
+ } else {
+ /* stop running stream */
+ if (runtime->state == SNDRV_PCM_STATE_RUNNING) {
+ snd_pcm_state_t new_state;
+
+ 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->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,
+ snd_pcm_state_t 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->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->state == SNDRV_PCM_STATE_PAUSED)
+ snd_pcm_pause(substream, false);
+
+ /* pre-start/stop - all running streams are changed to DRAINING state */
+ result = snd_pcm_action(&snd_pcm_action_drain_init, substream,
+ ACTION_ARG_IGNORE);
+ 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->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->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->state == SNDRV_PCM_STATE_OPEN ||
+ runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
+ return -EBADFD;
+
+ snd_pcm_stream_lock_irq(substream);
+ /* resume pause */
+ if (runtime->state == SNDRV_PCM_STATE_PAUSED)
+ snd_pcm_pause(substream, false);
+
+ 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;
+
+ if (substream == substream1) {
+ res = -EINVAL;
+ goto _badf;
+ }
+
+ 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->state == SNDRV_PCM_STATE_OPEN ||
+ substream->runtime->state != substream1->runtime->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_nested(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_nested(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)
+{
+ snd_pcm_format_t 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);
+ pcm_for_each_format(k) {
+ int bits;
+ if (!snd_mask_test_format(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, (__force unsigned)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;
+ snd_pcm_format_t k;
+
+ t.min = UINT_MAX;
+ t.max = 0;
+ t.openmin = 0;
+ t.openmax = 0;
+ pcm_for_each_format(k) {
+ int bits;
+ if (!snd_mask_test_format(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);
+}
+
+static 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;
+}
+
+static 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 |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_RW_INTERLEAVED);
+ if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
+ mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_RW_NONINTERLEAVED);
+ if (hw_support_mmap(substream)) {
+ if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
+ mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_INTERLEAVED);
+ if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
+ mask |= PARAM_MASK_BIT(SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED);
+ if (hw->info & SNDRV_PCM_INFO_COMPLEX)
+ mask |= PARAM_MASK_BIT(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,
+ PARAM_MASK_BIT(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->runtime->state != SNDRV_PCM_STATE_OPEN)
+ do_hw_free(substream);
+ substream->ops->close(substream);
+ substream->hw_opened = 0;
+ }
+ if (cpu_latency_qos_request_active(&substream->latency_pm_qos_req))
+ cpu_latency_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;
+ }
+
+ err = substream->ops->open(substream);
+ if (err < 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;
+ }
+
+ /* automatically set EXPLICIT_SYNC flag in the managed mode whenever
+ * the DMA buffer requires it
+ */
+ if (substream->managed_buffer_alloc &&
+ substream->dma_buffer.dev.need_sync)
+ substream->runtime->hw.info |= SNDRV_PCM_INFO_EXPLICIT_SYNC;
+
+ *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;
+
+ /* block until the device gets woken up as it may touch the hardware */
+ snd_power_wait(pcm->card);
+
+ 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->state) {
+ case SNDRV_PCM_STATE_DRAINING:
+ if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
+ return -EBADFD;
+ fallthrough;
+ 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);
+ if (ret >= 0)
+ snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
+ 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);
+ if (ret >= 0)
+ snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
+ return ret;
+}
+
+static int snd_pcm_delay(struct snd_pcm_substream *substream,
+ snd_pcm_sframes_t *delay)
+{
+ int err;
+
+ snd_pcm_stream_lock_irq(substream);
+ err = do_pcm_hwsync(substream);
+ if (delay && !err)
+ *delay = snd_pcm_calc_delay(substream);
+ snd_pcm_stream_unlock_irq(substream);
+ snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_CPU);
+
+ return err;
+}
+
+static inline int snd_pcm_hwsync(struct snd_pcm_substream *substream)
+{
+ return snd_pcm_delay(substream, NULL);
+}
+
+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 (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
+ snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
+ if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
+ return -EFAULT;
+ return 0;
+}
+
+struct snd_pcm_mmap_status32 {
+ snd_pcm_state_t state;
+ s32 pad1;
+ u32 hw_ptr;
+ s32 tstamp_sec;
+ s32 tstamp_nsec;
+ snd_pcm_state_t suspended_state;
+ s32 audio_tstamp_sec;
+ s32 audio_tstamp_nsec;
+} __attribute__((packed));
+
+struct snd_pcm_mmap_control32 {
+ u32 appl_ptr;
+ u32 avail_min;
+};
+
+struct snd_pcm_sync_ptr32 {
+ u32 flags;
+ union {
+ struct snd_pcm_mmap_status32 status;
+ unsigned char reserved[64];
+ } s;
+ union {
+ struct snd_pcm_mmap_control32 control;
+ unsigned char reserved[64];
+ } c;
+} __attribute__((packed));
+
+/* recalcuate the boundary within 32bit */
+static snd_pcm_uframes_t recalculate_boundary(struct snd_pcm_runtime *runtime)
+{
+ snd_pcm_uframes_t boundary;
+
+ if (! runtime->buffer_size)
+ return 0;
+ boundary = runtime->buffer_size;
+ while (boundary * 2 <= 0x7fffffffUL - runtime->buffer_size)
+ boundary *= 2;
+ return boundary;
+}
+
+static int snd_pcm_ioctl_sync_ptr_compat(struct snd_pcm_substream *substream,
+ struct snd_pcm_sync_ptr32 __user *src)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ volatile struct snd_pcm_mmap_status *status;
+ volatile struct snd_pcm_mmap_control *control;
+ u32 sflags;
+ struct snd_pcm_mmap_control scontrol;
+ struct snd_pcm_mmap_status sstatus;
+ snd_pcm_uframes_t boundary;
+ int err;
+
+ if (snd_BUG_ON(!runtime))
+ return -EINVAL;
+
+ if (get_user(sflags, &src->flags) ||
+ get_user(scontrol.appl_ptr, &src->c.control.appl_ptr) ||
+ get_user(scontrol.avail_min, &src->c.control.avail_min))
+ return -EFAULT;
+ if (sflags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
+ err = snd_pcm_hwsync(substream);
+ if (err < 0)
+ return err;
+ }
+ status = runtime->status;
+ control = runtime->control;
+ boundary = recalculate_boundary(runtime);
+ if (! boundary)
+ boundary = 0x7fffffff;
+ snd_pcm_stream_lock_irq(substream);
+ /* FIXME: we should consider the boundary for the sync from app */
+ if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL)) {
+ err = pcm_lib_apply_appl_ptr(substream,
+ scontrol.appl_ptr);
+ if (err < 0) {
+ snd_pcm_stream_unlock_irq(substream);
+ return err;
+ }
+ } else
+ scontrol.appl_ptr = control->appl_ptr % boundary;
+ if (!(sflags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
+ control->avail_min = scontrol.avail_min;
+ else
+ scontrol.avail_min = control->avail_min;
+ sstatus.state = status->state;
+ sstatus.hw_ptr = status->hw_ptr % boundary;
+ sstatus.tstamp = status->tstamp;
+ sstatus.suspended_state = status->suspended_state;
+ sstatus.audio_tstamp = status->audio_tstamp;
+ snd_pcm_stream_unlock_irq(substream);
+ if (!(sflags & SNDRV_PCM_SYNC_PTR_APPL))
+ snd_pcm_dma_buffer_sync(substream, SNDRV_DMA_SYNC_DEVICE);
+ if (put_user(sstatus.state, &src->s.status.state) ||
+ put_user(sstatus.hw_ptr, &src->s.status.hw_ptr) ||
+ put_user(sstatus.tstamp.tv_sec, &src->s.status.tstamp_sec) ||
+ put_user(sstatus.tstamp.tv_nsec, &src->s.status.tstamp_nsec) ||
+ put_user(sstatus.suspended_state, &src->s.status.suspended_state) ||
+ put_user(sstatus.audio_tstamp.tv_sec, &src->s.status.audio_tstamp_sec) ||
+ put_user(sstatus.audio_tstamp.tv_nsec, &src->s.status.audio_tstamp_nsec) ||
+ put_user(scontrol.appl_ptr, &src->c.control.appl_ptr) ||
+ put_user(scontrol.avail_min, &src->c.control.avail_min))
+ return -EFAULT;
+
+ return 0;
+}
+#define __SNDRV_PCM_IOCTL_SYNC_PTR32 _IOWR('A', 0x23, struct snd_pcm_sync_ptr32)
+
+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->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);
+ if (put_user(result, &_xferi->result))
+ return -EFAULT;
+ 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->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);
+ if (put_user(result, &_xfern->result))
+ return -EFAULT;
+ 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);
+ if (put_user(result, _frames))
+ return -EFAULT;
+ 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);
+ if (put_user(result, _frames))
+ return -EFAULT;
+ 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;
+
+ if (substream->runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
+ return -EBADFD;
+
+ res = snd_power_wait(substream->pcm->card);
+ 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_STATUS32:
+ return snd_pcm_status_user32(substream, arg, false);
+ case SNDRV_PCM_IOCTL_STATUS_EXT32:
+ return snd_pcm_status_user32(substream, arg, true);
+ case SNDRV_PCM_IOCTL_STATUS64:
+ return snd_pcm_status_user64(substream, arg, false);
+ case SNDRV_PCM_IOCTL_STATUS_EXT64:
+ return snd_pcm_status_user64(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 = 0;
+ 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_PTR32:
+ return snd_pcm_ioctl_sync_ptr_compat(substream, arg);
+ case __SNDRV_PCM_IOCTL_SYNC_PTR64:
+ 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_pause_lock_irq(substream, (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).
+ *
+ * Return: zero if successful, or a negative error code
+ */
+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;
+
+ if (substream->runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
+ return -EBADFD;
+
+ 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->state == SNDRV_PCM_STATE_OPEN ||
+ runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
+ 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->state == SNDRV_PCM_STATE_OPEN ||
+ runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
+ 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->state == SNDRV_PCM_STATE_OPEN ||
+ runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
+ 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->state == SNDRV_PCM_STATE_OPEN ||
+ runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
+ 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;
+ if (runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
+ return ok | EPOLLERR;
+
+ poll_wait(file, &runtime->sleep, wait);
+
+ mask = 0;
+ snd_pcm_stream_lock_irq(substream);
+ avail = snd_pcm_avail(substream);
+ switch (runtime->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;
+ area->vm_flags &= ~(VM_WRITE | VM_MAYWRITE);
+ 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 drivers require the explicit sync (typically for non-coherent
+ * pages), we have to disable the mmap of status and control data
+ * to enforce the control via SYNC_PTR ioctl.
+ */
+ if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_EXPLICIT_SYNC)
+ 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;
+ /* see above */
+ if (pcm_file->substream->runtime->hw.info & SNDRV_PCM_INFO_EXPLICIT_SYNC)
+ 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 */
+
+/*
+ * 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 if (!snd_pcm_get_dma_buf(substream))
+ page = virt_to_page(runtime->dma_area + offset);
+ else
+ page = snd_sgbuf_get_page(snd_pcm_get_dma_buf(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.
+ *
+ * Return: zero if successful, or a negative error code
+ */
+int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,
+ struct vm_area_struct *area)
+{
+ area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
+ if (!substream->ops->page &&
+ !snd_dma_buffer_mmap(snd_pcm_get_dma_buf(substream), area))
+ return 0;
+ /* 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.
+ *
+ * Return: zero if successful, or a negative error code
+ */
+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->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;
+ if (substream->runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
+ return -EBADFD;
+
+ offset = area->vm_pgoff << PAGE_SHIFT;
+ switch (offset) {
+ case SNDRV_PCM_MMAP_OFFSET_STATUS_OLD:
+ if (pcm_file->no_compat_mmap || !IS_ENABLED(CONFIG_64BIT))
+ return -ENXIO;
+ fallthrough;
+ case SNDRV_PCM_MMAP_OFFSET_STATUS_NEW:
+ if (!pcm_status_mmap_allowed(pcm_file))
+ return -ENXIO;
+ return snd_pcm_mmap_status(substream, file, area);
+ case SNDRV_PCM_MMAP_OFFSET_CONTROL_OLD:
+ if (pcm_file->no_compat_mmap || !IS_ENABLED(CONFIG_64BIT))
+ return -ENXIO;
+ fallthrough;
+ case SNDRV_PCM_MMAP_OFFSET_CONTROL_NEW:
+ 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;
+ if (runtime->state == SNDRV_PCM_STATE_DISCONNECTED)
+ return -EBADFD;
+ return snd_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_NEW:
+ return (unsigned long)runtime->status;
+ case SNDRV_PCM_MMAP_OFFSET_CONTROL_NEW:
+ 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,
+ }
+};
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-07 09:23:37 +0000