+++ /dev/null
-From 87ba8310e9f0882e85926ac1ef91333f8906b303 Mon Sep 17 00:00:00 2001
-From: Takashi Iwai <tiwai@suse.de>
-Date: Tue, 4 Sep 2018 17:58:49 +0200
-Subject: [PATCH] staging: bcm2835-audio: Operate non-atomic PCM ops
-
-commit 5c7883e5f27e829f3f3a2ba174d4a724bfd5f026 upstream.
-
-This is the most significant part in the patch series.
-
-The bcm2835-audio driver used to queue the commands to vc04 core via
-workqueue, but basically the whole accesses to vc04 core are done in
-the sleepable context, including the callback calls. In such a case,
-rewriting the code using non-atomic PCM ops will simplify the logic a
-lot.
-
-This patch does it: all workqueue are gone and each former-work
-implementation is now directly called from PCM ops like trigger and
-write transfer.
-
-Along with it, the DMA position updater, bcm2835_playback_fifo(), was
-also rewritten to use a simpler logic. Now it handles the XRUN and
-draining properly by calling snd_pcm_stop() conditionally.
-
-The current position is kept in atomic_t value so that it can be read
-concurrently from the pointer callback.
-
-Also, the bcm2835_audio_instance object is allocated at the beginning
-of bcm2835_audio_open(). This makes the resource management clearer.
-
-Signed-off-by: Takashi Iwai <tiwai@suse.de>
-Tested-by: Stefan Wahren <stefan.wahren@i2se.com>
-Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
----
- .../vc04_services/bcm2835-audio/bcm2835-pcm.c | 74 +++---
- .../bcm2835-audio/bcm2835-vchiq.c | 244 +++---------------
- .../vc04_services/bcm2835-audio/bcm2835.h | 9 +-
- 3 files changed, 82 insertions(+), 245 deletions(-)
-
---- a/drivers/staging/vc04_services/bcm2835-audio/bcm2835-pcm.c
-+++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835-pcm.c
-@@ -11,7 +11,8 @@
- /* hardware definition */
- static const struct snd_pcm_hardware snd_bcm2835_playback_hw = {
- .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
-- SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID),
-+ SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
-+ SNDRV_PCM_INFO_DRAIN_TRIGGER),
- .formats = SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE,
- .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
- .rate_min = 8000,
-@@ -27,7 +28,8 @@ static const struct snd_pcm_hardware snd
-
- static const struct snd_pcm_hardware snd_bcm2835_playback_spdif_hw = {
- .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER |
-- SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID),
-+ SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
-+ SNDRV_PCM_INFO_DRAIN_TRIGGER),
- .formats = SNDRV_PCM_FMTBIT_S16_LE,
- .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_44100 |
- SNDRV_PCM_RATE_48000,
-@@ -47,42 +49,34 @@ static void snd_bcm2835_playback_free(st
- kfree(runtime->private_data);
- }
-
--void bcm2835_playback_fifo(struct bcm2835_alsa_stream *alsa_stream)
-+void bcm2835_playback_fifo(struct bcm2835_alsa_stream *alsa_stream,
-+ unsigned int bytes)
- {
-- unsigned int consumed = 0;
-- int new_period = 0;
-+ struct snd_pcm_substream *substream = alsa_stream->substream;
-+ unsigned int pos;
-
-- audio_info("alsa_stream=%p substream=%p\n", alsa_stream,
-- alsa_stream ? alsa_stream->substream : 0);
-+ if (!alsa_stream->period_size)
-+ return;
-
-- consumed = bcm2835_audio_retrieve_buffers(alsa_stream);
--
-- /* We get called only if playback was triggered, So, the number of buffers we retrieve in
-- * each iteration are the buffers that have been played out already
-- */
--
-- if (alsa_stream->period_size) {
-- if ((alsa_stream->pos / alsa_stream->period_size) !=
-- ((alsa_stream->pos + consumed) / alsa_stream->period_size))
-- new_period = 1;
-- }
-- audio_debug("updating pos cur: %d + %d max:%d period_bytes:%d, hw_ptr: %d new_period:%d\n",
-- alsa_stream->pos,
-- consumed,
-- alsa_stream->buffer_size,
-- (int) (alsa_stream->period_size * alsa_stream->substream->runtime->periods),
-- frames_to_bytes(alsa_stream->substream->runtime, alsa_stream->substream->runtime->status->hw_ptr),
-- new_period);
-- if (alsa_stream->buffer_size) {
-- alsa_stream->pos += consumed & ~(1 << 30);
-- alsa_stream->pos %= alsa_stream->buffer_size;
-+ if (bytes >= alsa_stream->buffer_size) {
-+ snd_pcm_stream_lock(substream);
-+ snd_pcm_stop(substream,
-+ alsa_stream->draining ?
-+ SNDRV_PCM_STATE_SETUP :
-+ SNDRV_PCM_STATE_XRUN);
-+ snd_pcm_stream_unlock(substream);
-+ return;
- }
-
-- if (alsa_stream->substream) {
-- if (new_period)
-- snd_pcm_period_elapsed(alsa_stream->substream);
-- } else {
-- audio_warning(" unexpected NULL substream\n");
-+ pos = atomic_read(&alsa_stream->pos);
-+ pos += bytes;
-+ pos %= alsa_stream->buffer_size;
-+ atomic_set(&alsa_stream->pos, pos);
-+
-+ alsa_stream->period_offset += bytes;
-+ if (alsa_stream->period_offset >= alsa_stream->period_size) {
-+ alsa_stream->period_offset %= alsa_stream->period_size;
-+ snd_pcm_period_elapsed(substream);
- }
- }
-
-@@ -246,7 +240,8 @@ static int snd_bcm2835_pcm_prepare(struc
-
- alsa_stream->buffer_size = snd_pcm_lib_buffer_bytes(substream);
- alsa_stream->period_size = snd_pcm_lib_period_bytes(substream);
-- alsa_stream->pos = 0;
-+ atomic_set(&alsa_stream->pos, 0);
-+ alsa_stream->period_offset = 0;
- alsa_stream->draining = false;
-
- return 0;
-@@ -283,7 +278,7 @@ static int snd_bcm2835_pcm_trigger(struc
- return bcm2835_audio_start(alsa_stream);
- case SNDRV_PCM_TRIGGER_DRAIN:
- alsa_stream->draining = true;
-- return 0;
-+ return bcm2835_audio_drain(alsa_stream);
- case SNDRV_PCM_TRIGGER_STOP:
- return bcm2835_audio_stop(alsa_stream);
- default:
-@@ -300,7 +295,7 @@ snd_bcm2835_pcm_pointer(struct snd_pcm_s
-
- return snd_pcm_indirect_playback_pointer(substream,
- &alsa_stream->pcm_indirect,
-- alsa_stream->pos);
-+ atomic_read(&alsa_stream->pos));
- }
-
- /* operators */
-@@ -338,6 +333,7 @@ int snd_bcm2835_new_pcm(struct bcm2835_c
- if (err < 0)
- return err;
- pcm->private_data = chip;
-+ pcm->nonatomic = true;
- strcpy(pcm->name, "bcm2835 ALSA");
- chip->pcm = pcm;
- chip->dest = AUDIO_DEST_AUTO;
-@@ -367,6 +363,7 @@ int snd_bcm2835_new_spdif_pcm(struct bcm
- return err;
-
- pcm->private_data = chip;
-+ pcm->nonatomic = true;
- strcpy(pcm->name, "bcm2835 IEC958/HDMI");
- chip->pcm_spdif = pcm;
- snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
-@@ -395,6 +392,7 @@ int snd_bcm2835_new_simple_pcm(struct bc
- return err;
-
- pcm->private_data = chip;
-+ pcm->nonatomic = true;
- strcpy(pcm->name, name);
- chip->pcm = pcm;
- chip->dest = route;
---- a/drivers/staging/vc04_services/bcm2835-audio/bcm2835-vchiq.c
-+++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835-vchiq.c
-@@ -26,10 +26,6 @@
-
- /* ---- Private Constants and Types ------------------------------------------ */
-
--#define BCM2835_AUDIO_STOP 0
--#define BCM2835_AUDIO_START 1
--#define BCM2835_AUDIO_WRITE 2
--
- /* Logging macros (for remapping to other logging mechanisms, i.e., printf) */
- #ifdef AUDIO_DEBUG_ENABLE
- #define LOG_ERR(fmt, arg...) pr_err("%s:%d " fmt, __func__, __LINE__, ##arg)
-@@ -55,17 +51,6 @@ struct bcm2835_audio_instance {
-
- static bool force_bulk;
-
--/* ---- Private Variables ---------------------------------------------------- */
--
--/* ---- Private Function Prototypes ------------------------------------------ */
--
--/* ---- Private Functions ---------------------------------------------------- */
--
--static int bcm2835_audio_stop_worker(struct bcm2835_alsa_stream *alsa_stream);
--static int bcm2835_audio_start_worker(struct bcm2835_alsa_stream *alsa_stream);
--static int bcm2835_audio_write_worker(struct bcm2835_alsa_stream *alsa_stream,
-- unsigned int count, void *src);
--
- static void bcm2835_audio_lock(struct bcm2835_audio_instance *instance)
- {
- mutex_lock(&instance->vchi_mutex);
-@@ -135,108 +120,6 @@ static const u32 BCM2835_AUDIO_WRITE_COO
- static const u32 BCM2835_AUDIO_WRITE_COOKIE2 = ('D' << 24 | 'A' << 16 |
- 'T' << 8 | 'A');
-
--struct bcm2835_audio_work {
-- struct work_struct my_work;
-- struct bcm2835_alsa_stream *alsa_stream;
-- int cmd;
-- void *src;
-- unsigned int count;
--};
--
--static void my_wq_function(struct work_struct *work)
--{
-- struct bcm2835_audio_work *w =
-- container_of(work, struct bcm2835_audio_work, my_work);
-- int ret = -9;
--
-- switch (w->cmd) {
-- case BCM2835_AUDIO_START:
-- ret = bcm2835_audio_start_worker(w->alsa_stream);
-- break;
-- case BCM2835_AUDIO_STOP:
-- ret = bcm2835_audio_stop_worker(w->alsa_stream);
-- break;
-- case BCM2835_AUDIO_WRITE:
-- ret = bcm2835_audio_write_worker(w->alsa_stream, w->count,
-- w->src);
-- break;
-- default:
-- LOG_ERR(" Unexpected work: %p:%d\n", w->alsa_stream, w->cmd);
-- break;
-- }
-- kfree((void *)work);
--}
--
--int bcm2835_audio_start(struct bcm2835_alsa_stream *alsa_stream)
--{
-- struct bcm2835_audio_work *work;
--
-- work = kmalloc(sizeof(*work), GFP_ATOMIC);
-- /*--- Queue some work (item 1) ---*/
-- if (!work) {
-- LOG_ERR(" .. Error: NULL work kmalloc\n");
-- return -ENOMEM;
-- }
-- INIT_WORK(&work->my_work, my_wq_function);
-- work->alsa_stream = alsa_stream;
-- work->cmd = BCM2835_AUDIO_START;
-- if (!queue_work(alsa_stream->my_wq, &work->my_work)) {
-- kfree(work);
-- return -EBUSY;
-- }
-- return 0;
--}
--
--int bcm2835_audio_stop(struct bcm2835_alsa_stream *alsa_stream)
--{
-- struct bcm2835_audio_work *work;
--
-- work = kmalloc(sizeof(*work), GFP_ATOMIC);
-- /*--- Queue some work (item 1) ---*/
-- if (!work) {
-- LOG_ERR(" .. Error: NULL work kmalloc\n");
-- return -ENOMEM;
-- }
-- INIT_WORK(&work->my_work, my_wq_function);
-- work->alsa_stream = alsa_stream;
-- work->cmd = BCM2835_AUDIO_STOP;
-- if (!queue_work(alsa_stream->my_wq, &work->my_work)) {
-- kfree(work);
-- return -EBUSY;
-- }
-- return 0;
--}
--
--int bcm2835_audio_write(struct bcm2835_alsa_stream *alsa_stream,
-- unsigned int count, void *src)
--{
-- struct bcm2835_audio_work *work;
--
-- work = kmalloc(sizeof(*work), GFP_ATOMIC);
-- /*--- Queue some work (item 1) ---*/
-- if (!work) {
-- LOG_ERR(" .. Error: NULL work kmalloc\n");
-- return -ENOMEM;
-- }
-- INIT_WORK(&work->my_work, my_wq_function);
-- work->alsa_stream = alsa_stream;
-- work->cmd = BCM2835_AUDIO_WRITE;
-- work->src = src;
-- work->count = count;
-- if (!queue_work(alsa_stream->my_wq, &work->my_work)) {
-- kfree(work);
-- return -EBUSY;
-- }
-- return 0;
--}
--
--static void my_workqueue_quit(struct bcm2835_alsa_stream *alsa_stream)
--{
-- flush_workqueue(alsa_stream->my_wq);
-- destroy_workqueue(alsa_stream->my_wq);
-- alsa_stream->my_wq = NULL;
--}
--
- static void audio_vchi_callback(void *param,
- const VCHI_CALLBACK_REASON_T reason,
- void *msg_handle)
-@@ -249,47 +132,27 @@ static void audio_vchi_callback(void *pa
- if (reason != VCHI_CALLBACK_MSG_AVAILABLE)
- return;
-
-- if (!instance) {
-- LOG_ERR(" .. instance is null\n");
-- BUG();
-- return;
-- }
-- if (!instance->vchi_handle) {
-- LOG_ERR(" .. instance->vchi_handle is null\n");
-- BUG();
-- return;
-- }
- status = vchi_msg_dequeue(instance->vchi_handle,
- &m, sizeof(m), &msg_len, VCHI_FLAGS_NONE);
- if (m.type == VC_AUDIO_MSG_TYPE_RESULT) {
-- LOG_DBG(" .. instance=%p, m.type=VC_AUDIO_MSG_TYPE_RESULT, success=%d\n",
-- instance, m.u.result.success);
- instance->result = m.u.result.success;
- complete(&instance->msg_avail_comp);
- } else if (m.type == VC_AUDIO_MSG_TYPE_COMPLETE) {
-- struct bcm2835_alsa_stream *alsa_stream = instance->alsa_stream;
--
-- LOG_DBG(" .. instance=%p, m.type=VC_AUDIO_MSG_TYPE_COMPLETE, complete=%d\n",
-- instance, m.u.complete.count);
- if (m.u.complete.cookie1 != BCM2835_AUDIO_WRITE_COOKIE1 ||
- m.u.complete.cookie2 != BCM2835_AUDIO_WRITE_COOKIE2)
-- LOG_ERR(" .. response is corrupt\n");
-- else if (alsa_stream) {
-- atomic_add(m.u.complete.count,
-- &alsa_stream->retrieved);
-- bcm2835_playback_fifo(alsa_stream);
-- } else {
-- LOG_ERR(" .. unexpected alsa_stream=%p\n",
-- alsa_stream);
-- }
-+ LOG_ERR("invalid cookie\n");
-+ else
-+ bcm2835_playback_fifo(instance->alsa_stream,
-+ m.u.complete.count);
- } else {
-- LOG_ERR(" .. unexpected m.type=%d\n", m.type);
-+ LOG_ERR("unexpected callback type=%d\n", m.type);
- }
- }
-
--static struct bcm2835_audio_instance *
-+static int
- vc_vchi_audio_init(VCHI_INSTANCE_T vchi_instance,
-- VCHI_CONNECTION_T *vchi_connection)
-+ VCHI_CONNECTION_T *vchi_connection,
-+ struct bcm2835_audio_instance *instance)
- {
- SERVICE_CREATION_T params = {
- .version = VCHI_VERSION_EX(VC_AUDIOSERV_VER, VC_AUDIOSERV_MIN_VER),
-@@ -298,23 +161,14 @@ vc_vchi_audio_init(VCHI_INSTANCE_T vchi_
- .rx_fifo_size = 0,
- .tx_fifo_size = 0,
- .callback = audio_vchi_callback,
-+ .callback_param = instance,
- .want_unaligned_bulk_rx = 1, //TODO: remove VCOS_FALSE
- .want_unaligned_bulk_tx = 1, //TODO: remove VCOS_FALSE
- .want_crc = 0
- };
-- struct bcm2835_audio_instance *instance;
- int status;
-
-- /* Allocate memory for this instance */
-- instance = kzalloc(sizeof(*instance), GFP_KERNEL);
-- if (!instance)
-- return ERR_PTR(-ENOMEM);
--
-- /* Create a lock for exclusive, serialized VCHI connection access */
-- mutex_init(&instance->vchi_mutex);
- /* Open the VCHI service connections */
-- params.callback_param = instance,
--
- status = vchi_service_open(vchi_instance, ¶ms,
- &instance->vchi_handle);
-
-@@ -322,16 +176,16 @@ vc_vchi_audio_init(VCHI_INSTANCE_T vchi_
- LOG_ERR("%s: failed to open VCHI service connection (status=%d)\n",
- __func__, status);
- kfree(instance);
-- return ERR_PTR(-EPERM);
-+ return -EPERM;
- }
-
- /* Finished with the service for now */
- vchi_service_release(instance->vchi_handle);
-
-- return instance;
-+ return 0;
- }
-
--static int vc_vchi_audio_deinit(struct bcm2835_audio_instance *instance)
-+static void vc_vchi_audio_deinit(struct bcm2835_audio_instance *instance)
- {
- int status;
-
-@@ -346,10 +200,6 @@ static int vc_vchi_audio_deinit(struct b
- }
-
- mutex_unlock(&instance->vchi_mutex);
--
-- kfree(instance);
--
-- return 0;
- }
-
- int bcm2835_new_vchi_ctx(struct bcm2835_vchi_ctx *vchi_ctx)
-@@ -387,39 +237,25 @@ void bcm2835_free_vchi_ctx(struct bcm283
- vchi_ctx->vchi_instance = NULL;
- }
-
--static int bcm2835_audio_open_connection(struct bcm2835_alsa_stream *alsa_stream)
--{
-- struct bcm2835_audio_instance *instance =
-- (struct bcm2835_audio_instance *)alsa_stream->instance;
-- struct bcm2835_vchi_ctx *vhci_ctx = alsa_stream->chip->vchi_ctx;
--
-- /* Initialize an instance of the audio service */
-- instance = vc_vchi_audio_init(vhci_ctx->vchi_instance,
-- vhci_ctx->vchi_connection);
--
-- if (IS_ERR(instance))
-- return PTR_ERR(instance);
--
-- instance->alsa_stream = alsa_stream;
-- alsa_stream->instance = instance;
--
-- return 0;
--}
--
- int bcm2835_audio_open(struct bcm2835_alsa_stream *alsa_stream)
- {
-+ struct bcm2835_vchi_ctx *vchi_ctx = alsa_stream->chip->vchi_ctx;
- struct bcm2835_audio_instance *instance;
- int err;
-
-- alsa_stream->my_wq = alloc_workqueue("my_queue", WQ_HIGHPRI, 1);
-- if (!alsa_stream->my_wq)
-+ /* Allocate memory for this instance */
-+ instance = kzalloc(sizeof(*instance), GFP_KERNEL);
-+ if (!instance)
- return -ENOMEM;
-+ mutex_init(&instance->vchi_mutex);
-+ instance->alsa_stream = alsa_stream;
-+ alsa_stream->instance = instance;
-
-- err = bcm2835_audio_open_connection(alsa_stream);
-+ err = vc_vchi_audio_init(vchi_ctx->vchi_instance,
-+ vchi_ctx->vchi_connection,
-+ instance);
- if (err < 0)
-- goto free_wq;
--
-- instance = alsa_stream->instance;
-+ goto free_instance;
-
- err = bcm2835_audio_send_simple(instance, VC_AUDIO_MSG_TYPE_OPEN,
- false);
-@@ -438,8 +274,9 @@ int bcm2835_audio_open(struct bcm2835_al
-
- deinit:
- vc_vchi_audio_deinit(instance);
-- free_wq:
-- destroy_workqueue(alsa_stream->my_wq);
-+ free_instance:
-+ alsa_stream->instance = NULL;
-+ kfree(instance);
- return err;
- }
-
-@@ -478,37 +315,46 @@ int bcm2835_audio_set_params(struct bcm2
- return bcm2835_audio_send_msg(alsa_stream->instance, &m, true);
- }
-
--static int bcm2835_audio_start_worker(struct bcm2835_alsa_stream *alsa_stream)
-+int bcm2835_audio_start(struct bcm2835_alsa_stream *alsa_stream)
- {
- return bcm2835_audio_send_simple(alsa_stream->instance,
- VC_AUDIO_MSG_TYPE_START, false);
- }
-
--static int bcm2835_audio_stop_worker(struct bcm2835_alsa_stream *alsa_stream)
-+int bcm2835_audio_stop(struct bcm2835_alsa_stream *alsa_stream)
- {
- return bcm2835_audio_send_simple(alsa_stream->instance,
- VC_AUDIO_MSG_TYPE_STOP, false);
- }
-
-+int bcm2835_audio_drain(struct bcm2835_alsa_stream *alsa_stream)
-+{
-+ struct vc_audio_msg m = {
-+ .type = VC_AUDIO_MSG_TYPE_STOP,
-+ .u.stop.draining = 1,
-+ };
-+
-+ return bcm2835_audio_send_msg(alsa_stream->instance, &m, false);
-+}
-+
- int bcm2835_audio_close(struct bcm2835_alsa_stream *alsa_stream)
- {
- struct bcm2835_audio_instance *instance = alsa_stream->instance;
- int err;
-
-- my_workqueue_quit(alsa_stream);
--
- err = bcm2835_audio_send_simple(alsa_stream->instance,
- VC_AUDIO_MSG_TYPE_CLOSE, true);
-
- /* Stop the audio service */
- vc_vchi_audio_deinit(instance);
- alsa_stream->instance = NULL;
-+ kfree(instance);
-
- return err;
- }
-
--static int bcm2835_audio_write_worker(struct bcm2835_alsa_stream *alsa_stream,
-- unsigned int size, void *src)
-+int bcm2835_audio_write(struct bcm2835_alsa_stream *alsa_stream,
-+ unsigned int size, void *src)
- {
- struct bcm2835_audio_instance *instance = alsa_stream->instance;
- struct vc_audio_msg m = {
-@@ -558,13 +404,5 @@ static int bcm2835_audio_write_worker(st
- return err;
- }
-
--unsigned int bcm2835_audio_retrieve_buffers(struct bcm2835_alsa_stream *alsa_stream)
--{
-- unsigned int count = atomic_read(&alsa_stream->retrieved);
--
-- atomic_sub(count, &alsa_stream->retrieved);
-- return count;
--}
--
- module_param(force_bulk, bool, 0444);
- MODULE_PARM_DESC(force_bulk, "Force use of vchiq bulk for audio");
---- a/drivers/staging/vc04_services/bcm2835-audio/bcm2835.h
-+++ b/drivers/staging/vc04_services/bcm2835-audio/bcm2835.h
-@@ -121,13 +121,12 @@ struct bcm2835_alsa_stream {
-
- int draining;
-
-- unsigned int pos;
-+ atomic_t pos;
-+ unsigned int period_offset;
- unsigned int buffer_size;
- unsigned int period_size;
-
-- atomic_t retrieved;
- struct bcm2835_audio_instance *instance;
-- struct workqueue_struct *my_wq;
- int idx;
- };
-
-@@ -152,11 +151,13 @@ int bcm2835_audio_set_params(struct bcm2
- unsigned int bps);
- int bcm2835_audio_start(struct bcm2835_alsa_stream *alsa_stream);
- int bcm2835_audio_stop(struct bcm2835_alsa_stream *alsa_stream);
-+int bcm2835_audio_drain(struct bcm2835_alsa_stream *alsa_stream);
- int bcm2835_audio_set_ctls(struct bcm2835_alsa_stream *alsa_stream);
- int bcm2835_audio_write(struct bcm2835_alsa_stream *alsa_stream,
- unsigned int count,
- void *src);
--void bcm2835_playback_fifo(struct bcm2835_alsa_stream *alsa_stream);
-+void bcm2835_playback_fifo(struct bcm2835_alsa_stream *alsa_stream,
-+ unsigned int size);
- unsigned int bcm2835_audio_retrieve_buffers(struct bcm2835_alsa_stream *alsa_stream);
-
- #endif /* __SOUND_ARM_BCM2835_H */
projects / openwrt / staging / chunkeey.git / blobdiff