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staging: bcm2835-audio: initial staging submission 

Initial cleanup of bcm2835-audio driver for the
bcm2535(Raspberry PI)

Driver provides HDMI audio through ALSA and is built
on top of the vc04_services driver.

Original version of the driver is available at:
http://www.github.com/raspberry/linux

Driver compiles without any build errors or warnings.

Tested on a RPI 3 running in ARM64 mode with the
vlc player and alsautils.

Signed-off-by: Michael Zoran <mzoran@crowfest.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Michael Zoran 2017-01-25 16:39:49 -08:00 committed by Greg Kroah-Hartman
parent e7b56b14b8
commit 23b028c871
10 changed files with 2634 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/staging/Kconfig
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@ -102,4 +102,6 @@ source "drivers/staging/greybus/Kconfig"
source "drivers/staging/vc04_services/Kconfig"
source "drivers/staging/bcm2835-audio/Kconfig"
endif # STAGING

2
drivers/staging/Makefile
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@ -40,3 +40,5 @@ obj-$(CONFIG_MOST) += most/
obj-$(CONFIG_KS7010) += ks7010/
obj-$(CONFIG_GREYBUS) += greybus/
obj-$(CONFIG_BCM2835_VCHIQ) += vc04_services/
obj-$(CONFIG_SND_BCM2835) += bcm2835-audio/

7
drivers/staging/bcm2835-audio/Kconfig Normal file
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@ -0,0 +1,7 @@
config SND_BCM2835
tristate "BCM2835 ALSA driver"
depends on ARCH_BCM2835 && BCM2835_VCHIQ && SND
select SND_PCM
help
Say Y or M if you want to support BCM2835 Alsa pcm card driver

5
drivers/staging/bcm2835-audio/Makefile Normal file
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@ -0,0 +1,5 @@
obj-$(CONFIG_SND_BCM2835) += snd-bcm2835.o
snd-bcm2835-objs := bcm2835.o bcm2835-ctl.o bcm2835-pcm.o bcm2835-vchiq.o
ccflags-y += -Idrivers/staging/vc04_services -Idrivers/staging/vc04_services/interface/vcos/linuxkernel -D__VCCOREVER__=0x04000000

346
drivers/staging/bcm2835-audio/bcm2835-ctl.c Normal file
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@ -0,0 +1,346 @@
/*****************************************************************************
* Copyright 2011 Broadcom Corporation. All rights reserved.
*
* Unless you and Broadcom execute a separate written software license
* agreement governing use of this software, this software is licensed to you
* under the terms of the GNU General Public License version 2, available at
* http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
*
* Notwithstanding the above, under no circumstances may you combine this
* software in any way with any other Broadcom software provided under a
* license other than the GPL, without Broadcom's express prior written
* consent.
*****************************************************************************/
#include <linux/platform_device.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/jiffies.h>
#include <linux/slab.h>
#include <linux/time.h>
#include <linux/wait.h>
#include <linux/delay.h>
#include <linux/moduleparam.h>
#include <linux/sched.h>
#include <sound/core.h>
#include <sound/control.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/rawmidi.h>
#include <sound/initval.h>
#include <sound/tlv.h>
#include <sound/asoundef.h>
#include "bcm2835.h"
/* volume maximum and minimum in terms of 0.01dB */
#define CTRL_VOL_MAX 400
#define CTRL_VOL_MIN -10239 /* originally -10240 */
static int snd_bcm2835_ctl_info(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_info *uinfo)
{
audio_info(" ... IN\n");
if (kcontrol->private_value == PCM_PLAYBACK_VOLUME) {
uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
uinfo->count = 1;
uinfo->value.integer.min = CTRL_VOL_MIN;
uinfo->value.integer.max = CTRL_VOL_MAX; /* 2303 */
} else if (kcontrol->private_value == PCM_PLAYBACK_MUTE) {
uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
uinfo->count = 1;
uinfo->value.integer.min = 0;
uinfo->value.integer.max = 1;
} else if (kcontrol->private_value == PCM_PLAYBACK_DEVICE) {
uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
uinfo->count = 1;
uinfo->value.integer.min = 0;
uinfo->value.integer.max = AUDIO_DEST_MAX - 1;
}
audio_info(" ... OUT\n");
return 0;
}
/* toggles mute on or off depending on the value of nmute, and returns
* 1 if the mute value was changed, otherwise 0
*/
static int toggle_mute(struct bcm2835_chip *chip, int nmute)
{
/* if settings are ok, just return 0 */
if (chip->mute == nmute)
return 0;
/* if the sound is muted then we need to unmute */
if (chip->mute == CTRL_VOL_MUTE) {
chip->volume = chip->old_volume; /* copy the old volume back */
audio_info("Unmuting, old_volume = %d, volume = %d ...\n", chip->old_volume, chip->volume);
} else /* otherwise we mute */ {
chip->old_volume = chip->volume;
chip->volume = 26214; /* set volume to minimum level AKA mute */
audio_info("Muting, old_volume = %d, volume = %d ...\n", chip->old_volume, chip->volume);
}
chip->mute = nmute;
return 1;
}
static int snd_bcm2835_ctl_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct bcm2835_chip *chip = snd_kcontrol_chip(kcontrol);
if (mutex_lock_interruptible(&chip->audio_mutex))
return -EINTR;
BUG_ON(!chip && !(chip->avail_substreams & AVAIL_SUBSTREAMS_MASK));
if (kcontrol->private_value == PCM_PLAYBACK_VOLUME)
ucontrol->value.integer.value[0] = chip2alsa(chip->volume);
else if (kcontrol->private_value == PCM_PLAYBACK_MUTE)
ucontrol->value.integer.value[0] = chip->mute;
else if (kcontrol->private_value == PCM_PLAYBACK_DEVICE)
ucontrol->value.integer.value[0] = chip->dest;
mutex_unlock(&chip->audio_mutex);
return 0;
}
static int snd_bcm2835_ctl_put(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct bcm2835_chip *chip = snd_kcontrol_chip(kcontrol);
int changed = 0;
if (mutex_lock_interruptible(&chip->audio_mutex))
return -EINTR;
if (kcontrol->private_value == PCM_PLAYBACK_VOLUME) {
audio_info("Volume change attempted.. volume = %d new_volume = %d\n", chip->volume, (int) ucontrol->value.integer.value[0]);
if (chip->mute == CTRL_VOL_MUTE) {
/* changed = toggle_mute(chip, CTRL_VOL_UNMUTE); */
changed = 1; /* should return 0 to signify no change but the mixer takes this as the opposite sign (no idea why) */
goto unlock;
}
if (changed
|| (ucontrol->value.integer.value[0] != chip2alsa(chip->volume))) {
chip->volume = alsa2chip(ucontrol->value.integer.value[0]);
changed = 1;
}
} else if (kcontrol->private_value == PCM_PLAYBACK_MUTE) {
/* Now implemented */
audio_info(" Mute attempted\n");
changed = toggle_mute(chip, ucontrol->value.integer.value[0]);
} else if (kcontrol->private_value == PCM_PLAYBACK_DEVICE) {
if (ucontrol->value.integer.value[0] != chip->dest) {
chip->dest = ucontrol->value.integer.value[0];
changed = 1;
}
}
if (changed) {
if (bcm2835_audio_set_ctls(chip))
printk(KERN_ERR "Failed to set ALSA controls..\n");
}
unlock:
mutex_unlock(&chip->audio_mutex);
return changed;
}
static DECLARE_TLV_DB_SCALE(snd_bcm2835_db_scale, CTRL_VOL_MIN, 1, 1);
static struct snd_kcontrol_new snd_bcm2835_ctl[] = {
{
.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
.name = "PCM Playback Volume",
.index = 0,
.access = SNDRV_CTL_ELEM_ACCESS_READWRITE | SNDRV_CTL_ELEM_ACCESS_TLV_READ,
.private_value = PCM_PLAYBACK_VOLUME,
.info = snd_bcm2835_ctl_info,
.get = snd_bcm2835_ctl_get,
.put = snd_bcm2835_ctl_put,
.count = 1,
.tlv =
{.p = snd_bcm2835_db_scale}
},
{
.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
.name = "PCM Playback Switch",
.index = 0,
.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
.private_value = PCM_PLAYBACK_MUTE,
.info = snd_bcm2835_ctl_info,
.get = snd_bcm2835_ctl_get,
.put = snd_bcm2835_ctl_put,
.count = 1,
},
{
.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
.name = "PCM Playback Route",
.index = 0,
.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
.private_value = PCM_PLAYBACK_DEVICE,
.info = snd_bcm2835_ctl_info,
.get = snd_bcm2835_ctl_get,
.put = snd_bcm2835_ctl_put,
.count = 1,
},
};
static int snd_bcm2835_spdif_default_info(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_info *uinfo)
{
uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
uinfo->count = 1;
return 0;
}
static int snd_bcm2835_spdif_default_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct bcm2835_chip *chip = snd_kcontrol_chip(kcontrol);
int i;
if (mutex_lock_interruptible(&chip->audio_mutex))
return -EINTR;
for (i = 0; i < 4; i++)
ucontrol->value.iec958.status[i] =
(chip->spdif_status >> (i * 8)) && 0xff;
mutex_unlock(&chip->audio_mutex);
return 0;
}
static int snd_bcm2835_spdif_default_put(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct bcm2835_chip *chip = snd_kcontrol_chip(kcontrol);
unsigned int val = 0;
int i, change;
if (mutex_lock_interruptible(&chip->audio_mutex))
return -EINTR;
for (i = 0; i < 4; i++)
val |= (unsigned int) ucontrol->value.iec958.status[i] << (i * 8);
change = val != chip->spdif_status;
chip->spdif_status = val;
mutex_unlock(&chip->audio_mutex);
return change;
}
static int snd_bcm2835_spdif_mask_info(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_info *uinfo)
{
uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
uinfo->count = 1;
return 0;
}
static int snd_bcm2835_spdif_mask_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
/* bcm2835 supports only consumer mode and sets all other format flags
* automatically. So the only thing left is signalling non-audio
* content */
ucontrol->value.iec958.status[0] = IEC958_AES0_NONAUDIO;
return 0;
}
static int snd_bcm2835_spdif_stream_info(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_info *uinfo)
{
uinfo->type = SNDRV_CTL_ELEM_TYPE_IEC958;
uinfo->count = 1;
return 0;
}
static int snd_bcm2835_spdif_stream_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct bcm2835_chip *chip = snd_kcontrol_chip(kcontrol);
int i;
if (mutex_lock_interruptible(&chip->audio_mutex))
return -EINTR;
for (i = 0; i < 4; i++)
ucontrol->value.iec958.status[i] =
(chip->spdif_status >> (i * 8)) & 0xff;
mutex_unlock(&chip->audio_mutex);
return 0;
}
static int snd_bcm2835_spdif_stream_put(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct bcm2835_chip *chip = snd_kcontrol_chip(kcontrol);
unsigned int val = 0;
int i, change;
if (mutex_lock_interruptible(&chip->audio_mutex))
return -EINTR;
for (i = 0; i < 4; i++)
val |= (unsigned int) ucontrol->value.iec958.status[i] << (i * 8);
change = val != chip->spdif_status;
chip->spdif_status = val;
mutex_unlock(&chip->audio_mutex);
return change;
}
static struct snd_kcontrol_new snd_bcm2835_spdif[] = {
{
.iface = SNDRV_CTL_ELEM_IFACE_PCM,
.name = SNDRV_CTL_NAME_IEC958("", PLAYBACK, DEFAULT),
.info = snd_bcm2835_spdif_default_info,
.get = snd_bcm2835_spdif_default_get,
.put = snd_bcm2835_spdif_default_put
},
{
.access = SNDRV_CTL_ELEM_ACCESS_READ,
.iface = SNDRV_CTL_ELEM_IFACE_PCM,
.name = SNDRV_CTL_NAME_IEC958("", PLAYBACK, CON_MASK),
.info = snd_bcm2835_spdif_mask_info,
.get = snd_bcm2835_spdif_mask_get,
},
{
.access = SNDRV_CTL_ELEM_ACCESS_READWRITE |
SNDRV_CTL_ELEM_ACCESS_INACTIVE,
.iface = SNDRV_CTL_ELEM_IFACE_PCM,
.name = SNDRV_CTL_NAME_IEC958("", PLAYBACK, PCM_STREAM),
.info = snd_bcm2835_spdif_stream_info,
.get = snd_bcm2835_spdif_stream_get,
.put = snd_bcm2835_spdif_stream_put,
},
};
int snd_bcm2835_new_ctl(struct bcm2835_chip *chip)
{
int err;
unsigned int idx;
strcpy(chip->card->mixername, "Broadcom Mixer");
for (idx = 0; idx < ARRAY_SIZE(snd_bcm2835_ctl); idx++) {
err = snd_ctl_add(chip->card,
snd_ctl_new1(&snd_bcm2835_ctl[idx], chip));
if (err < 0)
return err;
}
for (idx = 0; idx < ARRAY_SIZE(snd_bcm2835_spdif); idx++) {
err = snd_ctl_add(chip->card,
snd_ctl_new1(&snd_bcm2835_spdif[idx], chip));
if (err < 0)
return err;
}
return 0;
}

560
drivers/staging/bcm2835-audio/bcm2835-pcm.c Normal file
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@ -0,0 +1,560 @@
/*****************************************************************************
* Copyright 2011 Broadcom Corporation. All rights reserved.
*
* Unless you and Broadcom execute a separate written software license
* agreement governing use of this software, this software is licensed to you
* under the terms of the GNU General Public License version 2, available at
* http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
*
* Notwithstanding the above, under no circumstances may you combine this
* software in any way with any other Broadcom software provided under a
* license other than the GPL, without Broadcom's express prior written
* consent.
*****************************************************************************/
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <sound/asoundef.h>
#include "bcm2835.h"
/* hardware definition */
static 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),
.formats = SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE,
.rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
.rate_min = 8000,
.rate_max = 48000,
.channels_min = 1,
.channels_max = 2,
.buffer_bytes_max = 128 * 1024,
.period_bytes_min = 1 * 1024,
.period_bytes_max = 128 * 1024,
.periods_min = 1,
.periods_max = 128,
};
static 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),
.formats = SNDRV_PCM_FMTBIT_S16_LE,
.rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_44100 |
SNDRV_PCM_RATE_48000,
.rate_min = 44100,
.rate_max = 48000,
.channels_min = 2,
.channels_max = 2,
.buffer_bytes_max = 128 * 1024,
.period_bytes_min = 1 * 1024,
.period_bytes_max = 128 * 1024,
.periods_min = 1,
.periods_max = 128,
};
static void snd_bcm2835_playback_free(struct snd_pcm_runtime *runtime)
{
audio_info("Freeing up alsa stream here ..\n");
if (runtime->private_data)
kfree(runtime->private_data);
runtime->private_data = NULL;
}
static irqreturn_t bcm2835_playback_fifo_irq(int irq, void *dev_id)
{
struct bcm2835_alsa_stream *alsa_stream = dev_id;
unsigned int consumed = 0;
int new_period = 0;
audio_info(" .. IN\n");
audio_info("alsa_stream=%p substream=%p\n", alsa_stream,
alsa_stream ? alsa_stream->substream : 0);
if (alsa_stream->open)
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 (alsa_stream->substream) {
if (new_period)
snd_pcm_period_elapsed(alsa_stream->substream);
} else {
audio_warning(" unexpected NULL substream\n");
}
audio_info(" .. OUT\n");
return IRQ_HANDLED;
}
/* open callback */
static int snd_bcm2835_playback_open_generic(
struct snd_pcm_substream *substream, int spdif)
{
struct bcm2835_chip *chip = snd_pcm_substream_chip(substream);
struct snd_pcm_runtime *runtime = substream->runtime;
struct bcm2835_alsa_stream *alsa_stream;
int idx;
int err;
audio_info(" .. IN (%d)\n", substream->number);
if (mutex_lock_interruptible(&chip->audio_mutex)) {
audio_error("Interrupted whilst waiting for lock\n");
return -EINTR;
}
audio_info("Alsa open (%d)\n", substream->number);
idx = substream->number;
if (spdif && chip->opened) {
err = -EBUSY;
goto out;
} else if (!spdif && (chip->opened & (1 << idx))) {
err = -EBUSY;
goto out;
}
if (idx > MAX_SUBSTREAMS) {
audio_error
("substream(%d) device doesn't exist max(%d) substreams allowed\n",
idx, MAX_SUBSTREAMS);
err = -ENODEV;
goto out;
}
/* Check if we are ready */
if (!(chip->avail_substreams & (1 << idx))) {
/* We are not ready yet */
audio_error("substream(%d) device is not ready yet\n", idx);
err = -EAGAIN;
goto out;
}
alsa_stream = kzalloc(sizeof(*alsa_stream), GFP_KERNEL);
if (!alsa_stream) {
err = -ENOMEM;
goto out;
}
/* Initialise alsa_stream */
alsa_stream->chip = chip;
alsa_stream->substream = substream;
alsa_stream->idx = idx;
sema_init(&alsa_stream->buffers_update_sem, 0);
sema_init(&alsa_stream->control_sem, 0);
spin_lock_init(&alsa_stream->lock);
/* Enabled in start trigger, called on each "fifo irq" after that */
alsa_stream->enable_fifo_irq = 0;
alsa_stream->fifo_irq_handler = bcm2835_playback_fifo_irq;
err = bcm2835_audio_open(alsa_stream);
if (err) {
kfree(alsa_stream);
goto out;
}
runtime->private_data = alsa_stream;
runtime->private_free = snd_bcm2835_playback_free;
if (spdif) {
runtime->hw = snd_bcm2835_playback_spdif_hw;
} else {
/* clear spdif status, as we are not in spdif mode */
chip->spdif_status = 0;
runtime->hw = snd_bcm2835_playback_hw;
}
/* minimum 16 bytes alignment (for vchiq bulk transfers) */
snd_pcm_hw_constraint_step(runtime,
0,
SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
16);
chip->alsa_stream[idx] = alsa_stream;
chip->opened |= (1 << idx);
alsa_stream->open = 1;
alsa_stream->draining = 1;
out:
mutex_unlock(&chip->audio_mutex);
audio_info(" .. OUT =%d\n", err);
return err;
}
static int snd_bcm2835_playback_open(struct snd_pcm_substream *substream)
{
return snd_bcm2835_playback_open_generic(substream, 0);
}
static int snd_bcm2835_playback_spdif_open(struct snd_pcm_substream *substream)
{
return snd_bcm2835_playback_open_generic(substream, 1);
}
/* close callback */
static int snd_bcm2835_playback_close(struct snd_pcm_substream *substream)
{
/* the hardware-specific codes will be here */
struct bcm2835_chip *chip;
struct snd_pcm_runtime *runtime;
struct bcm2835_alsa_stream *alsa_stream;
audio_info(" .. IN\n");
chip = snd_pcm_substream_chip(substream);
if (mutex_lock_interruptible(&chip->audio_mutex)) {
audio_error("Interrupted whilst waiting for lock\n");
return -EINTR;
}
runtime = substream->runtime;
alsa_stream = runtime->private_data;
audio_info("Alsa close\n");
/*
* Call stop if it's still running. This happens when app
* is force killed and we don't get a stop trigger.
*/
if (alsa_stream->running) {
int err;
err = bcm2835_audio_stop(alsa_stream);
alsa_stream->running = 0;
if (err)
audio_error(" Failed to STOP alsa device\n");
}
alsa_stream->period_size = 0;
alsa_stream->buffer_size = 0;
if (alsa_stream->open) {
alsa_stream->open = 0;
bcm2835_audio_close(alsa_stream);
}
if (alsa_stream->chip)
alsa_stream->chip->alsa_stream[alsa_stream->idx] = NULL;
/*
* Do not free up alsa_stream here, it will be freed up by
* runtime->private_free callback we registered in *_open above
*/
chip->opened &= ~(1 << substream->number);
mutex_unlock(&chip->audio_mutex);
audio_info(" .. OUT\n");
return 0;
}
/* hw_params callback */
static int snd_bcm2835_pcm_hw_params(struct snd_pcm_substream *substream,
struct snd_pcm_hw_params *params)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct bcm2835_alsa_stream *alsa_stream = runtime->private_data;
int err;
audio_info(" .. IN\n");
err = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params));
if (err < 0) {
audio_error
(" pcm_lib_malloc failed to allocated pages for buffers\n");
return err;
}
alsa_stream->channels = params_channels(params);
alsa_stream->params_rate = params_rate(params);
alsa_stream->pcm_format_width = snd_pcm_format_width(params_format(params));
audio_info(" .. OUT\n");
return err;
}
/* hw_free callback */
static int snd_bcm2835_pcm_hw_free(struct snd_pcm_substream *substream)
{
audio_info(" .. IN\n");
return snd_pcm_lib_free_pages(substream);
}
/* prepare callback */
static int snd_bcm2835_pcm_prepare(struct snd_pcm_substream *substream)
{
struct bcm2835_chip *chip = snd_pcm_substream_chip(substream);
struct snd_pcm_runtime *runtime = substream->runtime;
struct bcm2835_alsa_stream *alsa_stream = runtime->private_data;
int channels;
int err;
audio_info(" .. IN\n");
if (mutex_lock_interruptible(&chip->audio_mutex))
return -EINTR;
/* notify the vchiq that it should enter spdif passthrough mode by
* setting channels=0 (see
* https://github.com/raspberrypi/linux/issues/528) */
if (chip->spdif_status & IEC958_AES0_NONAUDIO)
channels = 0;
else
channels = alsa_stream->channels;
err = bcm2835_audio_set_params(alsa_stream, channels,
alsa_stream->params_rate,
alsa_stream->pcm_format_width);
if (err < 0) {
audio_error(" error setting hw params\n");
}
bcm2835_audio_setup(alsa_stream);
/* in preparation of the stream, set the controls (volume level) of the stream */
bcm2835_audio_set_ctls(alsa_stream->chip);
memset(&alsa_stream->pcm_indirect, 0, sizeof(alsa_stream->pcm_indirect));
alsa_stream->pcm_indirect.hw_buffer_size =
alsa_stream->pcm_indirect.sw_buffer_size =
snd_pcm_lib_buffer_bytes(substream);
alsa_stream->buffer_size = snd_pcm_lib_buffer_bytes(substream);
alsa_stream->period_size = snd_pcm_lib_period_bytes(substream);
alsa_stream->pos = 0;
audio_debug("buffer_size=%d, period_size=%d pos=%d frame_bits=%d\n",
alsa_stream->buffer_size, alsa_stream->period_size,
alsa_stream->pos, runtime->frame_bits);
mutex_unlock(&chip->audio_mutex);
audio_info(" .. OUT\n");
return 0;
}
static void snd_bcm2835_pcm_transfer(struct snd_pcm_substream *substream,
struct snd_pcm_indirect *rec, size_t bytes)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct bcm2835_alsa_stream *alsa_stream = runtime->private_data;
void *src = (void *) (substream->runtime->dma_area + rec->sw_data);
int err;
err = bcm2835_audio_write(alsa_stream, bytes, src);
if (err)
audio_error(" Failed to transfer to alsa device (%d)\n", err);
}
static int snd_bcm2835_pcm_ack(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct bcm2835_alsa_stream *alsa_stream = runtime->private_data;
struct snd_pcm_indirect *pcm_indirect = &alsa_stream->pcm_indirect;
pcm_indirect->hw_queue_size = runtime->hw.buffer_bytes_max;
snd_pcm_indirect_playback_transfer(substream, pcm_indirect,
snd_bcm2835_pcm_transfer);
return 0;
}
/* trigger callback */
static int snd_bcm2835_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct bcm2835_alsa_stream *alsa_stream = runtime->private_data;
int err = 0;
audio_info(" .. IN\n");
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
audio_debug("bcm2835_AUDIO_TRIGGER_START running=%d\n",
alsa_stream->running);
if (!alsa_stream->running) {
err = bcm2835_audio_start(alsa_stream);
if (!err) {
alsa_stream->pcm_indirect.hw_io =
alsa_stream->pcm_indirect.hw_data =
bytes_to_frames(runtime,
alsa_stream->pos);
substream->ops->ack(substream);
alsa_stream->running = 1;
alsa_stream->draining = 1;
} else {
audio_error(" Failed to START alsa device (%d)\n", err);
}
}
break;
case SNDRV_PCM_TRIGGER_STOP:
audio_debug
("bcm2835_AUDIO_TRIGGER_STOP running=%d draining=%d\n",
alsa_stream->running, runtime->status->state == SNDRV_PCM_STATE_DRAINING);
if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
audio_info("DRAINING\n");
alsa_stream->draining = 1;
} else {
audio_info("DROPPING\n");
alsa_stream->draining = 0;
}
if (alsa_stream->running) {
err = bcm2835_audio_stop(alsa_stream);
if (err != 0)
audio_error(" Failed to STOP alsa device (%d)\n", err);
alsa_stream->running = 0;
}
break;
default:
err = -EINVAL;
}
audio_info(" .. OUT\n");
return err;
}
/* pointer callback */
static snd_pcm_uframes_t
snd_bcm2835_pcm_pointer(struct snd_pcm_substream *substream)
{
struct snd_pcm_runtime *runtime = substream->runtime;
struct bcm2835_alsa_stream *alsa_stream = runtime->private_data;
audio_info(" .. IN\n");
audio_debug("pcm_pointer... (%d) hwptr=%d appl=%d pos=%d\n", 0,
frames_to_bytes(runtime, runtime->status->hw_ptr),
frames_to_bytes(runtime, runtime->control->appl_ptr),
alsa_stream->pos);
audio_info(" .. OUT\n");
return snd_pcm_indirect_playback_pointer(substream,
&alsa_stream->pcm_indirect,
alsa_stream->pos);
}
static int snd_bcm2835_pcm_lib_ioctl(struct snd_pcm_substream *substream,
unsigned int cmd, void *arg)
{
int ret = snd_pcm_lib_ioctl(substream, cmd, arg);
audio_info(" .. substream=%p, cmd=%d, arg=%p (%x) ret=%d\n", substream,
cmd, arg, arg ? *(unsigned *) arg : 0, ret);
return ret;
}
/* operators */
static struct snd_pcm_ops snd_bcm2835_playback_ops = {
.open = snd_bcm2835_playback_open,
.close = snd_bcm2835_playback_close,
.ioctl = snd_bcm2835_pcm_lib_ioctl,
.hw_params = snd_bcm2835_pcm_hw_params,
.hw_free = snd_bcm2835_pcm_hw_free,
.prepare = snd_bcm2835_pcm_prepare,
.trigger = snd_bcm2835_pcm_trigger,
.pointer = snd_bcm2835_pcm_pointer,
.ack = snd_bcm2835_pcm_ack,
};
static struct snd_pcm_ops snd_bcm2835_playback_spdif_ops = {
.open = snd_bcm2835_playback_spdif_open,
.close = snd_bcm2835_playback_close,
.ioctl = snd_bcm2835_pcm_lib_ioctl,
.hw_params = snd_bcm2835_pcm_hw_params,
.hw_free = snd_bcm2835_pcm_hw_free,
.prepare = snd_bcm2835_pcm_prepare,
.trigger = snd_bcm2835_pcm_trigger,
.pointer = snd_bcm2835_pcm_pointer,
.ack = snd_bcm2835_pcm_ack,
};
/* create a pcm device */
int snd_bcm2835_new_pcm(struct bcm2835_chip *chip)
{
struct snd_pcm *pcm;
int err;
audio_info(" .. IN\n");
mutex_init(&chip->audio_mutex);
if (mutex_lock_interruptible(&chip->audio_mutex)) {
audio_error("Interrupted whilst waiting for lock\n");
return -EINTR;
}
err = snd_pcm_new(chip->card, "bcm2835 ALSA", 0, MAX_SUBSTREAMS, 0, &pcm);
if (err < 0)
goto out;
pcm->private_data = chip;
strcpy(pcm->name, "bcm2835 ALSA");
chip->pcm = pcm;
chip->dest = AUDIO_DEST_AUTO;
chip->volume = alsa2chip(0);
chip->mute = CTRL_VOL_UNMUTE; /*disable mute on startup */
/* set operators */
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
&snd_bcm2835_playback_ops);
/* pre-allocation of buffers */
/* NOTE: this may fail */
snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
snd_dma_continuous_data(GFP_KERNEL),
snd_bcm2835_playback_hw.buffer_bytes_max,
snd_bcm2835_playback_hw.buffer_bytes_max);
out:
mutex_unlock(&chip->audio_mutex);
audio_info(" .. OUT\n");
return 0;
}
int snd_bcm2835_new_spdif_pcm(struct bcm2835_chip *chip)
{
struct snd_pcm *pcm;
int err;
audio_info(" .. IN\n");
if (mutex_lock_interruptible(&chip->audio_mutex)) {
audio_error("Interrupted whilst waiting for lock\n");
return -EINTR;
}
err = snd_pcm_new(chip->card, "bcm2835 ALSA", 1, 1, 0, &pcm);
if (err < 0)
goto out;
pcm->private_data = chip;
strcpy(pcm->name, "bcm2835 IEC958/HDMI");
chip->pcm_spdif = pcm;
snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
&snd_bcm2835_playback_spdif_ops);
/* pre-allocation of buffers */
/* NOTE: this may fail */
snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
snd_dma_continuous_data(GFP_KERNEL),
snd_bcm2835_playback_spdif_hw.buffer_bytes_max, snd_bcm2835_playback_spdif_hw.buffer_bytes_max);
out:
mutex_unlock(&chip->audio_mutex);
audio_info(" .. OUT\n");
return 0;
}

903
drivers/staging/bcm2835-audio/bcm2835-vchiq.c Normal file
View File

@ -0,0 +1,903 @@
/*****************************************************************************
* Copyright 2011 Broadcom Corporation. All rights reserved.
*
* Unless you and Broadcom execute a separate written software license
* agreement governing use of this software, this software is licensed to you
* under the terms of the GNU General Public License version 2, available at
* http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
*
* Notwithstanding the above, under no circumstances may you combine this
* software in any way with any other Broadcom software provided under a
* license other than the GPL, without Broadcom's express prior written
* consent.
*****************************************************************************/
#include <linux/device.h>
#include <sound/core.h>
#include <sound/initval.h>
#include <sound/pcm.h>
#include <linux/io.h>
#include <linux/interrupt.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/mm.h>
#include <linux/syscalls.h>
#include <asm/uaccess.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/atomic.h>
#include <linux/module.h>
#include <linux/completion.h>
#include "bcm2835.h"
/* ---- Include Files -------------------------------------------------------- */
#include "interface/vchi/vchi.h"
#include "vc_vchi_audioserv_defs.h"
/* ---- 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)
#define LOG_WARN( fmt, arg... ) pr_info( "%s:%d " fmt, __func__, __LINE__, ##arg)
#define LOG_INFO( fmt, arg... ) pr_info( "%s:%d " fmt, __func__, __LINE__, ##arg)
#define LOG_DBG( fmt, arg... ) pr_info( "%s:%d " fmt, __func__, __LINE__, ##arg)
#else
#define LOG_ERR( fmt, arg... ) pr_err( "%s:%d " fmt, __func__, __LINE__, ##arg)
#define LOG_WARN( fmt, arg... )
#define LOG_INFO( fmt, arg... )
#define LOG_DBG( fmt, arg... )
#endif
struct bcm2835_audio_instance {
unsigned int num_connections;
VCHI_SERVICE_HANDLE_T vchi_handle[VCHI_MAX_NUM_CONNECTIONS];
struct completion msg_avail_comp;
struct mutex vchi_mutex;
struct bcm2835_alsa_stream *alsa_stream;
int result;
short peer_version;
};
bool force_bulk = false;
/* ---- 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);
// Routine to send a message across a service
static ssize_t
bcm2835_vchi_msg_queue_callback(void *context, void *dest,
size_t offset, size_t maxsize)
{
memcpy(dest, context + offset, maxsize);
return maxsize;
}
static int
bcm2835_vchi_msg_queue(VCHI_SERVICE_HANDLE_T handle,
void *data,
unsigned int size)
{
return vchi_msg_queue(handle,
bcm2835_vchi_msg_queue_callback,
data,
size);
}
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;
LOG_DBG(" .. IN %p:%d\n", w->alsa_stream, w->cmd);
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);
LOG_DBG(" .. OUT %d\n", ret);
}
int bcm2835_audio_start(struct bcm2835_alsa_stream *alsa_stream)
{
int ret = -1;
LOG_DBG(" .. IN\n");
if (alsa_stream->my_wq) {
struct bcm2835_audio_work *work =
kmalloc(sizeof(struct bcm2835_audio_work *), GFP_ATOMIC);
/*--- Queue some work (item 1) ---*/
if (work) {
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))
ret = 0;
} else
LOG_ERR(" .. Error: NULL work kmalloc\n");
}
LOG_DBG(" .. OUT %d\n", ret);
return ret;
}
int bcm2835_audio_stop(struct bcm2835_alsa_stream *alsa_stream)
{
int ret = -1;
LOG_DBG(" .. IN\n");
if (alsa_stream->my_wq) {
struct bcm2835_audio_work *work =
kmalloc(sizeof(struct bcm2835_audio_work *), GFP_ATOMIC);
/*--- Queue some work (item 1) ---*/
if (work) {
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))
ret = 0;
} else
LOG_ERR(" .. Error: NULL work kmalloc\n");
}
LOG_DBG(" .. OUT %d\n", ret);
return ret;
}
int bcm2835_audio_write(struct bcm2835_alsa_stream *alsa_stream,
unsigned int count, void *src)
{
int ret = -1;
LOG_DBG(" .. IN\n");
if (alsa_stream->my_wq) {
struct bcm2835_audio_work *work =
kmalloc(sizeof(struct bcm2835_audio_work *), GFP_ATOMIC);
/*--- Queue some work (item 1) ---*/
if (work) {
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))
ret = 0;
} else
LOG_ERR(" .. Error: NULL work kmalloc\n");
}
LOG_DBG(" .. OUT %d\n", ret);
return ret;
}
void my_workqueue_init(struct bcm2835_alsa_stream *alsa_stream)
{
alsa_stream->my_wq = alloc_workqueue("my_queue", WQ_HIGHPRI, 1);
return;
}
void my_workqueue_quit(struct bcm2835_alsa_stream *alsa_stream)
{
if (alsa_stream->my_wq) {
flush_workqueue(alsa_stream->my_wq);
destroy_workqueue(alsa_stream->my_wq);
alsa_stream->my_wq = NULL;
}
return;
}
static void audio_vchi_callback(void *param,
const VCHI_CALLBACK_REASON_T reason,
void *msg_handle)
{
struct bcm2835_audio_instance *instance = param;
int status;
int msg_len;
struct vc_audio_msg m;
LOG_DBG(" .. IN instance=%p, handle=%p, alsa=%p, reason=%d, handle=%p\n",
instance, instance ? instance->vchi_handle[0] : NULL, instance ? instance->alsa_stream : NULL, reason, msg_handle);
if (reason != VCHI_CALLBACK_MSG_AVAILABLE) {
return;
}
if (!instance) {
LOG_ERR(" .. instance is null\n");
BUG();
return;
}
if (!instance->vchi_handle[0]) {
LOG_ERR(" .. instance->vchi_handle[0] is null\n");
BUG();
return;
}
status = vchi_msg_dequeue(instance->vchi_handle[0],
&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;
#if defined(CONFIG_64BIT)
irq_handler_t callback =
(irq_handler_t) (((unsigned long) m.u.complete.callbackl) |
((unsigned long) m.u.complete.callbackh << 32));
#else
irq_handler_t callback = (irq_handler_t) m.u.complete.callback;
#endif
LOG_DBG(" .. instance=%p, m.type=VC_AUDIO_MSG_TYPE_COMPLETE, complete=%d\n",
instance, m.u.complete.count);
if (alsa_stream && callback) {
atomic_add(m.u.complete.count, &alsa_stream->retrieved);
callback(0, alsa_stream);
} else {
LOG_ERR(" .. unexpected alsa_stream=%p, callback=%p\n",
alsa_stream, callback);
}
} else {
LOG_ERR(" .. unexpected m.type=%d\n", m.type);
}
LOG_DBG(" .. OUT\n");
}
static struct bcm2835_audio_instance *
vc_vchi_audio_init(VCHI_INSTANCE_T vchi_instance,
VCHI_CONNECTION_T **vchi_connections,
unsigned int num_connections)
{
unsigned int i;
struct bcm2835_audio_instance *instance;
int status;
LOG_DBG("%s: start", __func__);
if (num_connections > VCHI_MAX_NUM_CONNECTIONS) {
LOG_ERR("%s: unsupported number of connections %u (max=%u)\n",
__func__, num_connections, VCHI_MAX_NUM_CONNECTIONS);
return NULL;
}
/* Allocate memory for this instance */
instance = kmalloc(sizeof(*instance), GFP_KERNEL);
if (!instance)
return NULL;
memset(instance, 0, sizeof(*instance));
instance->num_connections = num_connections;
/* Create a lock for exclusive, serialized VCHI connection access */
mutex_init(&instance->vchi_mutex);
/* Open the VCHI service connections */
for (i = 0; i < num_connections; i++) {
SERVICE_CREATION_T params = {
VCHI_VERSION_EX(VC_AUDIOSERV_VER, VC_AUDIOSERV_MIN_VER),
VC_AUDIO_SERVER_NAME, // 4cc service code
vchi_connections[i], // passed in fn pointers
0, // rx fifo size (unused)
0, // tx fifo size (unused)
audio_vchi_callback, // service callback
instance, // service callback parameter
1, //TODO: remove VCOS_FALSE, // unaligned bulk recieves
1, //TODO: remove VCOS_FALSE, // unaligned bulk transmits
0 // want crc check on bulk transfers
};
LOG_DBG("%s: about to open %i\n", __func__, i);
status = vchi_service_open(vchi_instance, &params,
&instance->vchi_handle[i]);
LOG_DBG("%s: opened %i: %p=%d\n", __func__, i, instance->vchi_handle[i], status);
if (status) {
LOG_ERR("%s: failed to open VCHI service connection (status=%d)\n",
__func__, status);
goto err_close_services;
}
/* Finished with the service for now */
vchi_service_release(instance->vchi_handle[i]);
}
LOG_DBG("%s: okay\n", __func__);
return instance;
err_close_services:
for (i = 0; i < instance->num_connections; i++) {
LOG_ERR("%s: closing %i: %p\n", __func__, i, instance->vchi_handle[i]);
if (instance->vchi_handle[i])
vchi_service_close(instance->vchi_handle[i]);
}
kfree(instance);
LOG_ERR("%s: error\n", __func__);
return NULL;
}
static int vc_vchi_audio_deinit(struct bcm2835_audio_instance *instance)
{
unsigned int i;
LOG_DBG(" .. IN\n");
if (!instance) {
LOG_ERR("%s: invalid handle %p\n", __func__, instance);
return -1;
}
LOG_DBG(" .. about to lock (%d)\n", instance->num_connections);
if (mutex_lock_interruptible(&instance->vchi_mutex)) {
LOG_DBG("Interrupted whilst waiting for lock on (%d)\n",
instance->num_connections);
return -EINTR;
}
/* Close all VCHI service connections */
for (i = 0; i < instance->num_connections; i++) {
int status;
LOG_DBG(" .. %i:closing %p\n", i, instance->vchi_handle[i]);
vchi_service_use(instance->vchi_handle[i]);
status = vchi_service_close(instance->vchi_handle[i]);
if (status) {
LOG_DBG("%s: failed to close VCHI service connection (status=%d)\n",
__func__, status);
}
}
mutex_unlock(&instance->vchi_mutex);
kfree(instance);
LOG_DBG(" .. OUT\n");
return 0;
}
static int bcm2835_audio_open_connection(struct bcm2835_alsa_stream *alsa_stream)
{
static VCHI_INSTANCE_T vchi_instance;
static VCHI_CONNECTION_T *vchi_connection;
static int initted;
struct bcm2835_audio_instance *instance =
(struct bcm2835_audio_instance *)alsa_stream->instance;
int ret;
LOG_DBG(" .. IN\n");
LOG_INFO("%s: start\n", __func__);
BUG_ON(instance);
if (instance) {
LOG_ERR("%s: VCHI instance already open (%p)\n",
__func__, instance);
instance->alsa_stream = alsa_stream;
alsa_stream->instance = instance;
ret = 0; // xxx todo -1;
goto err_free_mem;
}
/* Initialize and create a VCHI connection */
if (!initted) {
ret = vchi_initialise(&vchi_instance);
if (ret) {
LOG_ERR("%s: failed to initialise VCHI instance (ret=%d)\n",
__func__, ret);
ret = -EIO;
goto err_free_mem;
}
ret = vchi_connect(NULL, 0, vchi_instance);
if (ret) {
LOG_ERR("%s: failed to connect VCHI instance (ret=%d)\n",
__func__, ret);
ret = -EIO;
goto err_free_mem;
}
initted = 1;
}
/* Initialize an instance of the audio service */
instance = vc_vchi_audio_init(vchi_instance, &vchi_connection, 1);
if (!instance) {
LOG_ERR("%s: failed to initialize audio service\n", __func__);
ret = -EPERM;
goto err_free_mem;
}
instance->alsa_stream = alsa_stream;
alsa_stream->instance = instance;
LOG_DBG(" success !\n");
err_free_mem:
LOG_DBG(" .. OUT\n");
return ret;
}
int bcm2835_audio_open(struct bcm2835_alsa_stream *alsa_stream)
{
struct bcm2835_audio_instance *instance;
struct vc_audio_msg m;
int status;
int ret;
LOG_DBG(" .. IN\n");
my_workqueue_init(alsa_stream);
ret = bcm2835_audio_open_connection(alsa_stream);
if (ret) {
ret = -1;
goto exit;
}
instance = alsa_stream->instance;
LOG_DBG(" instance (%p)\n", instance);
if (mutex_lock_interruptible(&instance->vchi_mutex)) {
LOG_DBG("Interrupted whilst waiting for lock on (%d)\n", instance->num_connections);
return -EINTR;
}
vchi_service_use(instance->vchi_handle[0]);
m.type = VC_AUDIO_MSG_TYPE_OPEN;
/* Send the message to the videocore */
status = bcm2835_vchi_msg_queue(instance->vchi_handle[0],
&m, sizeof(m));
if (status) {
LOG_ERR("%s: failed on vchi_msg_queue (status=%d)\n",
__func__, status);
ret = -1;
goto unlock;
}
ret = 0;
unlock:
vchi_service_release(instance->vchi_handle[0]);
mutex_unlock(&instance->vchi_mutex);
exit:
LOG_DBG(" .. OUT\n");
return ret;
}
static int bcm2835_audio_set_ctls_chan(struct bcm2835_alsa_stream *alsa_stream,
struct bcm2835_chip *chip)
{
struct vc_audio_msg m;
struct bcm2835_audio_instance *instance = alsa_stream->instance;
int status;
int ret;
LOG_DBG(" .. IN\n");
LOG_INFO(" Setting ALSA dest(%d), volume(%d)\n",
chip->dest, chip->volume);
if (mutex_lock_interruptible(&instance->vchi_mutex)) {
LOG_DBG("Interrupted whilst waiting for lock on (%d)\n",
instance->num_connections);
return -EINTR;
}
vchi_service_use(instance->vchi_handle[0]);
instance->result = -1;
m.type = VC_AUDIO_MSG_TYPE_CONTROL;
m.u.control.dest = chip->dest;
m.u.control.volume = chip->volume;
/* Create the message available completion */
init_completion(&instance->msg_avail_comp);
/* Send the message to the videocore */
status = bcm2835_vchi_msg_queue(instance->vchi_handle[0],
&m, sizeof(m));
if (status) {
LOG_ERR("%s: failed on vchi_msg_queue (status=%d)\n",
__func__, status);
ret = -1;
goto unlock;
}
/* We are expecting a reply from the videocore */
wait_for_completion(&instance->msg_avail_comp);
if (instance->result) {
LOG_ERR("%s: result=%d\n", __func__, instance->result);
ret = -1;
goto unlock;
}
ret = 0;
unlock:
vchi_service_release(instance->vchi_handle[0]);
mutex_unlock(&instance->vchi_mutex);
LOG_DBG(" .. OUT\n");
return ret;
}
int bcm2835_audio_set_ctls(struct bcm2835_chip *chip)
{
int i;
int ret = 0;
LOG_DBG(" .. IN\n");
LOG_DBG(" Setting ALSA dest(%d), volume(%d)\n", chip->dest, chip->volume);
/* change ctls for all substreams */
for (i = 0; i < MAX_SUBSTREAMS; i++) {
if (chip->avail_substreams & (1 << i)) {
if (!chip->alsa_stream[i]) {
LOG_DBG(" No ALSA stream available?! %i:%p (%x)\n", i, chip->alsa_stream[i], chip->avail_substreams);
ret = 0;
} else if (bcm2835_audio_set_ctls_chan(chip->alsa_stream[i], chip) != 0) {
LOG_ERR("Couldn't set the controls for stream %d\n", i);
ret = -1;
} else LOG_DBG(" Controls set for stream %d\n", i);
}
}
LOG_DBG(" .. OUT ret=%d\n", ret);
return ret;
}
int bcm2835_audio_set_params(struct bcm2835_alsa_stream *alsa_stream,
unsigned int channels, unsigned int samplerate,
unsigned int bps)
{
struct vc_audio_msg m;
struct bcm2835_audio_instance *instance = alsa_stream->instance;
int status;
int ret;
LOG_DBG(" .. IN\n");
LOG_INFO(" Setting ALSA channels(%d), samplerate(%d), bits-per-sample(%d)\n",
channels, samplerate, bps);
/* resend ctls - alsa_stream may not have been open when first send */
ret = bcm2835_audio_set_ctls_chan(alsa_stream, alsa_stream->chip);
if (ret) {
LOG_ERR(" Alsa controls not supported\n");
return -EINVAL;
}
if (mutex_lock_interruptible(&instance->vchi_mutex)) {
LOG_DBG("Interrupted whilst waiting for lock on (%d)\n", instance->num_connections);
return -EINTR;
}
vchi_service_use(instance->vchi_handle[0]);
instance->result = -1;
m.type = VC_AUDIO_MSG_TYPE_CONFIG;
m.u.config.channels = channels;
m.u.config.samplerate = samplerate;
m.u.config.bps = bps;
/* Create the message available completion */
init_completion(&instance->msg_avail_comp);
/* Send the message to the videocore */
status = bcm2835_vchi_msg_queue(instance->vchi_handle[0],
&m, sizeof(m));
if (status) {
LOG_ERR("%s: failed on vchi_msg_queue (status=%d)\n",
__func__, status);
ret = -1;
goto unlock;
}
/* We are expecting a reply from the videocore */
wait_for_completion(&instance->msg_avail_comp);
if (instance->result) {
LOG_ERR("%s: result=%d", __func__, instance->result);
ret = -1;
goto unlock;
}
ret = 0;
unlock:
vchi_service_release(instance->vchi_handle[0]);
mutex_unlock(&instance->vchi_mutex);
LOG_DBG(" .. OUT\n");
return ret;
}
int bcm2835_audio_setup(struct bcm2835_alsa_stream *alsa_stream)
{
LOG_DBG(" .. IN\n");
LOG_DBG(" .. OUT\n");
return 0;
}
static int bcm2835_audio_start_worker(struct bcm2835_alsa_stream *alsa_stream)
{
struct vc_audio_msg m;
struct bcm2835_audio_instance *instance = alsa_stream->instance;
int status;
int ret;
LOG_DBG(" .. IN\n");
if (mutex_lock_interruptible(&instance->vchi_mutex)) {
LOG_DBG("Interrupted whilst waiting for lock on (%d)\n",
instance->num_connections);
return -EINTR;
}
vchi_service_use(instance->vchi_handle[0]);
m.type = VC_AUDIO_MSG_TYPE_START;
/* Send the message to the videocore */
status = bcm2835_vchi_msg_queue(instance->vchi_handle[0],
&m, sizeof(m));
if (status) {
LOG_ERR("%s: failed on vchi_msg_queue (status=%d)\n",
__func__, status);
ret = -1;
goto unlock;
}
ret = 0;
unlock:
vchi_service_release(instance->vchi_handle[0]);
mutex_unlock(&instance->vchi_mutex);
LOG_DBG(" .. OUT\n");
return ret;
}
static int bcm2835_audio_stop_worker(struct bcm2835_alsa_stream *alsa_stream)
{
struct vc_audio_msg m;
struct bcm2835_audio_instance *instance = alsa_stream->instance;
int status;
int ret;
LOG_DBG(" .. IN\n");
if (mutex_lock_interruptible(&instance->vchi_mutex)) {
LOG_DBG("Interrupted whilst waiting for lock on (%d)\n",
instance->num_connections);
return -EINTR;
}
vchi_service_use(instance->vchi_handle[0]);
m.type = VC_AUDIO_MSG_TYPE_STOP;
m.u.stop.draining = alsa_stream->draining;
/* Send the message to the videocore */
status = bcm2835_vchi_msg_queue(instance->vchi_handle[0],
&m, sizeof(m));
if (status) {
LOG_ERR("%s: failed on vchi_msg_queue (status=%d)\n",
__func__, status);
ret = -1;
goto unlock;
}
ret = 0;
unlock:
vchi_service_release(instance->vchi_handle[0]);
mutex_unlock(&instance->vchi_mutex);
LOG_DBG(" .. OUT\n");
return ret;
}
int bcm2835_audio_close(struct bcm2835_alsa_stream *alsa_stream)
{
struct vc_audio_msg m;
struct bcm2835_audio_instance *instance = alsa_stream->instance;
int status;
int ret;
LOG_DBG(" .. IN\n");
my_workqueue_quit(alsa_stream);
if (mutex_lock_interruptible(&instance->vchi_mutex)) {
LOG_DBG("Interrupted whilst waiting for lock on (%d)\n",
instance->num_connections);
return -EINTR;
}
vchi_service_use(instance->vchi_handle[0]);
m.type = VC_AUDIO_MSG_TYPE_CLOSE;
/* Create the message available completion */
init_completion(&instance->msg_avail_comp);
/* Send the message to the videocore */
status = bcm2835_vchi_msg_queue(instance->vchi_handle[0],
&m, sizeof(m));
if (status) {
LOG_ERR("%s: failed on vchi_msg_queue (status=%d)\n",
__func__, status);
ret = -1;
goto unlock;
}
/* We are expecting a reply from the videocore */
wait_for_completion(&instance->msg_avail_comp);
if (instance->result) {
LOG_ERR("%s: failed result (result=%d)\n",
__func__, instance->result);
ret = -1;
goto unlock;
}
ret = 0;
unlock:
vchi_service_release(instance->vchi_handle[0]);
mutex_unlock(&instance->vchi_mutex);
/* Stop the audio service */
if (instance) {
vc_vchi_audio_deinit(instance);
alsa_stream->instance = NULL;
}
LOG_DBG(" .. OUT\n");
return ret;
}
int bcm2835_audio_write_worker(struct bcm2835_alsa_stream *alsa_stream,
unsigned int count, void *src)
{
struct vc_audio_msg m;
struct bcm2835_audio_instance *instance = alsa_stream->instance;
int status;
int ret;
LOG_DBG(" .. IN\n");
LOG_INFO(" Writing %d bytes from %p\n", count, src);
if (mutex_lock_interruptible(&instance->vchi_mutex)) {
LOG_DBG("Interrupted whilst waiting for lock on (%d)\n",
instance->num_connections);
return -EINTR;
}
vchi_service_use(instance->vchi_handle[0]);
if (instance->peer_version == 0 && vchi_get_peer_version(instance->vchi_handle[0], &instance->peer_version) == 0) {
LOG_DBG("%s: client version %d connected\n", __func__, instance->peer_version);
}
m.type = VC_AUDIO_MSG_TYPE_WRITE;
m.u.write.count = count;
// old version uses bulk, new version uses control
m.u.write.max_packet = instance->peer_version < 2 || force_bulk ? 0 : 4000;
#if defined(CONFIG_64BIT)
m.u.write.callbackl = (u32) (((unsigned long) alsa_stream->fifo_irq_handler)&0xFFFFFFFF);
m.u.write.callbackh = (u32) ((((unsigned long) alsa_stream->fifo_irq_handler) >> 32)&0xFFFFFFFF);
#else
m.u.write.callback = alsa_stream->fifo_irq_handler;
m.u.write.cookie = alsa_stream;
#endif
m.u.write.silence = src == NULL;
/* Send the message to the videocore */
status = bcm2835_vchi_msg_queue(instance->vchi_handle[0],
&m, sizeof(m));
if (status) {
LOG_ERR("%s: failed on vchi_msg_queue (status=%d)\n",
__func__, status);
ret = -1;
goto unlock;
}
if (!m.u.write.silence) {
if (!m.u.write.max_packet) {
/* Send the message to the videocore */
status = vchi_bulk_queue_transmit(instance->vchi_handle[0],
src, count,
0 *
VCHI_FLAGS_BLOCK_UNTIL_QUEUED
+
1 *
VCHI_FLAGS_BLOCK_UNTIL_DATA_READ,
NULL);
} else {
while (count > 0) {
int bytes = min((int) m.u.write.max_packet, (int) count);
status = bcm2835_vchi_msg_queue(instance->vchi_handle[0],
src, bytes);
src = (char *)src + bytes;
count -= bytes;
}
}
if (status) {
LOG_ERR("%s: failed on vchi_bulk_queue_transmit (status=%d)\n",
__func__, status);
ret = -1;
goto unlock;
}
}
ret = 0;
unlock:
vchi_service_release(instance->vchi_handle[0]);
mutex_unlock(&instance->vchi_mutex);
LOG_DBG(" .. OUT\n");
return ret;
}
/**
* Returns all buffers from arm->vc
*/
void bcm2835_audio_flush_buffers(struct bcm2835_alsa_stream *alsa_stream)
{
LOG_DBG(" .. IN\n");
LOG_DBG(" .. OUT\n");
return;
}
/**
* Forces VC to flush(drop) its filled playback buffers and
* return them the us. (VC->ARM)
*/
void bcm2835_audio_flush_playback_buffers(struct bcm2835_alsa_stream *alsa_stream)
{
LOG_DBG(" .. IN\n");
LOG_DBG(" .. OUT\n");
}
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");

519
drivers/staging/bcm2835-audio/bcm2835.c Normal file
View File

@ -0,0 +1,519 @@
/*****************************************************************************
* Copyright 2011 Broadcom Corporation. All rights reserved.
*
* Unless you and Broadcom execute a separate written software license
* agreement governing use of this software, this software is licensed to you
* under the terms of the GNU General Public License version 2, available at
* http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
*
* Notwithstanding the above, under no circumstances may you combine this
* software in any way with any other Broadcom software provided under a
* license other than the GPL, without Broadcom's express prior written
* consent.
*****************************************************************************/
#include <linux/platform_device.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/of.h>
#include "bcm2835.h"
/* module parameters (see "Module Parameters") */
/* SNDRV_CARDS: maximum number of cards supported by this module */
static int index[MAX_SUBSTREAMS] = {[0 ... (MAX_SUBSTREAMS - 1)] = -1};
static char *id[MAX_SUBSTREAMS] = {[0 ... (MAX_SUBSTREAMS - 1)] = NULL};
static int enable[MAX_SUBSTREAMS] = {[0 ... (MAX_SUBSTREAMS - 1)] = 1};
/* HACKY global pointers needed for successive probes to work : ssp
* But compared against the changes we will have to do in VC audio_ipc code
* to export 8 audio_ipc devices as a single IPC device and then monitor all
* four devices in a thread, this gets things done quickly and should be easier
* to debug if we run into issues
*/
static struct snd_card *g_card = NULL;
static struct bcm2835_chip *g_chip = NULL;
static int snd_bcm2835_free(struct bcm2835_chip *chip)
{
kfree(chip);
return 0;
}
/* component-destructor
* (see "Management of Cards and Components")
*/
static int snd_bcm2835_dev_free(struct snd_device *device)
{
return snd_bcm2835_free(device->device_data);
}
/* chip-specific constructor
* (see "Management of Cards and Components")
*/
static int snd_bcm2835_create(struct snd_card *card,
struct platform_device *pdev,
struct bcm2835_chip ** rchip)
{
struct bcm2835_chip *chip;
int err;
static struct snd_device_ops ops = {
.dev_free = snd_bcm2835_dev_free,
};
*rchip = NULL;
chip = kzalloc(sizeof(*chip), GFP_KERNEL);
if (chip == NULL)
return -ENOMEM;
chip->card = card;
err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
if (err < 0) {
snd_bcm2835_free(chip);
return err;
}
*rchip = chip;
return 0;
}
static int snd_bcm2835_alsa_probe_dt(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct bcm2835_chip *chip;
struct snd_card *card;
u32 numchans;
int err, i;
err = of_property_read_u32(dev->of_node, "brcm,pwm-channels",
&numchans);
if (err) {
dev_err(dev, "Failed to get DT property 'brcm,pwm-channels'");
return err;
}
if (numchans == 0 || numchans > MAX_SUBSTREAMS) {
numchans = MAX_SUBSTREAMS;
dev_warn(dev, "Illegal 'brcm,pwm-channels' value, will use %u\n",
numchans);
}
err = snd_card_new(&pdev->dev, -1, NULL, THIS_MODULE, 0, &card);
if (err) {
dev_err(dev, "Failed to create soundcard structure\n");
return err;
}
snd_card_set_dev(card, dev);
strcpy(card->driver, "bcm2835");
strcpy(card->shortname, "bcm2835 ALSA");
sprintf(card->longname, "%s", card->shortname);
err = snd_bcm2835_create(card, pdev, &chip);
if (err < 0) {
dev_err(dev, "Failed to create bcm2835 chip\n");
goto err_free;
}
err = snd_bcm2835_new_pcm(chip);
if (err < 0) {
dev_err(dev, "Failed to create new bcm2835 pcm device\n");
goto err_free;
}
err = snd_bcm2835_new_spdif_pcm(chip);
if (err < 0) {
dev_err(dev, "Failed to create new bcm2835 spdif pcm device\n");
goto err_free;
}
err = snd_bcm2835_new_ctl(chip);
if (err < 0) {
dev_err(dev, "Failed to create new bcm2835 ctl\n");
goto err_free;
}
for (i = 0; i < numchans; i++) {
chip->avail_substreams |= (1 << i);
chip->pdev[i] = pdev;
}
err = snd_card_register(card);
if (err) {
dev_err(dev, "Failed to register bcm2835 ALSA card \n");
goto err_free;
}
g_card = card;
g_chip = chip;
platform_set_drvdata(pdev, card);
audio_info("bcm2835 ALSA card created with %u channels\n", numchans);
return 0;
err_free:
snd_card_free(card);
return err;
}
static int snd_bcm2835_alsa_probe(struct platform_device *pdev)
{
static int dev;
struct bcm2835_chip *chip;
struct snd_card *card;
int err;
if (pdev->dev.of_node)
return snd_bcm2835_alsa_probe_dt(pdev);
if (dev >= MAX_SUBSTREAMS)
return -ENODEV;
if (!enable[dev]) {
dev++;
return -ENOENT;
}
if (dev > 0)
goto add_register_map;
err = snd_card_new(&pdev->dev, index[dev], id[dev], THIS_MODULE, 0, &g_card);
if (err < 0)
goto out;
snd_card_set_dev(g_card, &pdev->dev);
strcpy(g_card->driver, "bcm2835");
strcpy(g_card->shortname, "bcm2835 ALSA");
sprintf(g_card->longname, "%s", g_card->shortname);
err = snd_bcm2835_create(g_card, pdev, &chip);
if (err < 0) {
dev_err(&pdev->dev, "Failed to create bcm2835 chip\n");
goto out_bcm2835_create;
}
g_chip = chip;
err = snd_bcm2835_new_pcm(chip);
if (err < 0) {
dev_err(&pdev->dev, "Failed to create new BCM2835 pcm device\n");
goto out_bcm2835_new_pcm;
}
err = snd_bcm2835_new_spdif_pcm(chip);
if (err < 0) {
dev_err(&pdev->dev, "Failed to create new BCM2835 spdif pcm device\n");
goto out_bcm2835_new_spdif;
}
err = snd_bcm2835_new_ctl(chip);
if (err < 0) {
dev_err(&pdev->dev, "Failed to create new BCM2835 ctl\n");
goto out_bcm2835_new_ctl;
}
add_register_map:
card = g_card;
chip = g_chip;
BUG_ON(!(card && chip));
chip->avail_substreams |= (1 << dev);
chip->pdev[dev] = pdev;
if (!dev) {
err = snd_card_register(card);
if (err < 0) {
dev_err(&pdev->dev,
"Failed to register bcm2835 ALSA card \n");
goto out_card_register;
}
platform_set_drvdata(pdev, card);
audio_info("bcm2835 ALSA card created!\n");
} else {
audio_info("bcm2835 ALSA chip created!\n");
platform_set_drvdata(pdev, (void*)(long)dev);
}
dev++;
return 0;
out_card_register:
out_bcm2835_new_ctl :
out_bcm2835_new_spdif :
out_bcm2835_new_pcm :
out_bcm2835_create :
BUG_ON(!g_card);
if (snd_card_free(g_card))
dev_err(&pdev->dev, "Failed to free Registered alsa card\n");
g_card = NULL;
out:
dev = SNDRV_CARDS; /* stop more avail_substreams from being probed */
dev_err(&pdev->dev, "BCM2835 ALSA Probe failed !!\n");
return err;
}
static int snd_bcm2835_alsa_remove(struct platform_device *pdev)
{
int idx;
void *drv_data;
drv_data = platform_get_drvdata(pdev);
if (drv_data == (void *) g_card) {
/* This is the card device */
snd_card_free((struct snd_card *)drv_data);
g_card = NULL;
g_chip = NULL;
} else {
idx = (int)(long)drv_data;
if (g_card) {
BUG_ON(!g_chip);
/* We pass chip device numbers in audio ipc devices
* other than the one we registered our card with
*/
idx = (int)(long)drv_data;
BUG_ON(!idx || idx > MAX_SUBSTREAMS);
g_chip->avail_substreams &= ~(1 << idx);
/* There should be atleast one substream registered
* after we are done here, as it wil be removed when
* the *remove* is called for the card device
*/
BUG_ON(!g_chip->avail_substreams);
}
}
platform_set_drvdata(pdev, NULL);
return 0;
}
#ifdef CONFIG_PM
static int snd_bcm2835_alsa_suspend(struct platform_device *pdev,
pm_message_t state)
{
return 0;
}
static int snd_bcm2835_alsa_resume(struct platform_device *pdev)
{
return 0;
}
#endif
static const struct of_device_id snd_bcm2835_of_match_table[] = {
{ .compatible = "brcm,bcm2835-audio",},
{},
};
MODULE_DEVICE_TABLE(of, snd_bcm2835_of_match_table);
static struct platform_driver bcm2835_alsa0_driver = {
.probe = snd_bcm2835_alsa_probe,
.remove = snd_bcm2835_alsa_remove,
#ifdef CONFIG_PM
.suspend = snd_bcm2835_alsa_suspend,
.resume = snd_bcm2835_alsa_resume,
#endif
.driver =
{
.name = "bcm2835_AUD0",
.owner = THIS_MODULE,
.of_match_table = snd_bcm2835_of_match_table,
},
};
static struct platform_driver bcm2835_alsa1_driver = {
.probe = snd_bcm2835_alsa_probe,
.remove = snd_bcm2835_alsa_remove,
#ifdef CONFIG_PM
.suspend = snd_bcm2835_alsa_suspend,
.resume = snd_bcm2835_alsa_resume,
#endif
.driver =
{
.name = "bcm2835_AUD1",
.owner = THIS_MODULE,
},
};
static struct platform_driver bcm2835_alsa2_driver = {
.probe = snd_bcm2835_alsa_probe,
.remove = snd_bcm2835_alsa_remove,
#ifdef CONFIG_PM
.suspend = snd_bcm2835_alsa_suspend,
.resume = snd_bcm2835_alsa_resume,
#endif
.driver =
{
.name = "bcm2835_AUD2",
.owner = THIS_MODULE,
},
};
static struct platform_driver bcm2835_alsa3_driver = {
.probe = snd_bcm2835_alsa_probe,
.remove = snd_bcm2835_alsa_remove,
#ifdef CONFIG_PM
.suspend = snd_bcm2835_alsa_suspend,
.resume = snd_bcm2835_alsa_resume,
#endif
.driver =
{
.name = "bcm2835_AUD3",
.owner = THIS_MODULE,
},
};
static struct platform_driver bcm2835_alsa4_driver = {
.probe = snd_bcm2835_alsa_probe,
.remove = snd_bcm2835_alsa_remove,
#ifdef CONFIG_PM
.suspend = snd_bcm2835_alsa_suspend,
.resume = snd_bcm2835_alsa_resume,
#endif
.driver =
{
.name = "bcm2835_AUD4",
.owner = THIS_MODULE,
},
};
static struct platform_driver bcm2835_alsa5_driver = {
.probe = snd_bcm2835_alsa_probe,
.remove = snd_bcm2835_alsa_remove,
#ifdef CONFIG_PM
.suspend = snd_bcm2835_alsa_suspend,
.resume = snd_bcm2835_alsa_resume,
#endif
.driver =
{
.name = "bcm2835_AUD5",
.owner = THIS_MODULE,
},
};
static struct platform_driver bcm2835_alsa6_driver = {
.probe = snd_bcm2835_alsa_probe,
.remove = snd_bcm2835_alsa_remove,
#ifdef CONFIG_PM
.suspend = snd_bcm2835_alsa_suspend,
.resume = snd_bcm2835_alsa_resume,
#endif
.driver =
{
.name = "bcm2835_AUD6",
.owner = THIS_MODULE,
},
};
static struct platform_driver bcm2835_alsa7_driver = {
.probe = snd_bcm2835_alsa_probe,
.remove = snd_bcm2835_alsa_remove,
#ifdef CONFIG_PM
.suspend = snd_bcm2835_alsa_suspend,
.resume = snd_bcm2835_alsa_resume,
#endif
.driver =
{
.name = "bcm2835_AUD7",
.owner = THIS_MODULE,
},
};
static int bcm2835_alsa_device_init(void)
{
int err;
err = platform_driver_register(&bcm2835_alsa0_driver);
if (err) {
pr_err("Error registering bcm2835_alsa0_driver %d .\n", err);
goto out;
}
err = platform_driver_register(&bcm2835_alsa1_driver);
if (err) {
pr_err("Error registering bcm2835_alsa0_driver %d .\n", err);
goto unregister_0;
}
err = platform_driver_register(&bcm2835_alsa2_driver);
if (err) {
pr_err("Error registering bcm2835_alsa0_driver %d .\n", err);
goto unregister_1;
}
err = platform_driver_register(&bcm2835_alsa3_driver);
if (err) {
pr_err("Error registering bcm2835_alsa0_driver %d .\n", err);
goto unregister_2;
}
err = platform_driver_register(&bcm2835_alsa4_driver);
if (err) {
pr_err("Error registering bcm2835_alsa0_driver %d .\n", err);
goto unregister_3;
}
err = platform_driver_register(&bcm2835_alsa5_driver);
if (err) {
pr_err("Error registering bcm2835_alsa0_driver %d .\n", err);
goto unregister_4;
}
err = platform_driver_register(&bcm2835_alsa6_driver);
if (err) {
pr_err("Error registering bcm2835_alsa0_driver %d .\n", err);
goto unregister_5;
}
err = platform_driver_register(&bcm2835_alsa7_driver);
if (err) {
pr_err("Error registering bcm2835_alsa0_driver %d .\n", err);
goto unregister_6;
}
return 0;
unregister_6:
platform_driver_unregister(&bcm2835_alsa6_driver);
unregister_5:
platform_driver_unregister(&bcm2835_alsa5_driver);
unregister_4:
platform_driver_unregister(&bcm2835_alsa4_driver);
unregister_3:
platform_driver_unregister(&bcm2835_alsa3_driver);
unregister_2:
platform_driver_unregister(&bcm2835_alsa2_driver);
unregister_1:
platform_driver_unregister(&bcm2835_alsa1_driver);
unregister_0:
platform_driver_unregister(&bcm2835_alsa0_driver);
out:
return err;
}
static void bcm2835_alsa_device_exit(void)
{
platform_driver_unregister(&bcm2835_alsa0_driver);
platform_driver_unregister(&bcm2835_alsa1_driver);
platform_driver_unregister(&bcm2835_alsa2_driver);
platform_driver_unregister(&bcm2835_alsa3_driver);
platform_driver_unregister(&bcm2835_alsa4_driver);
platform_driver_unregister(&bcm2835_alsa5_driver);
platform_driver_unregister(&bcm2835_alsa6_driver);
platform_driver_unregister(&bcm2835_alsa7_driver);
}
late_initcall(bcm2835_alsa_device_init);
module_exit(bcm2835_alsa_device_exit);
MODULE_AUTHOR("Dom Cobley");
MODULE_DESCRIPTION("Alsa driver for BCM2835 chip");
MODULE_LICENSE("GPL");

169
drivers/staging/bcm2835-audio/bcm2835.h Normal file
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/*****************************************************************************
* Copyright 2011 Broadcom Corporation. All rights reserved.
*
* Unless you and Broadcom execute a separate written software license
* agreement governing use of this software, this software is licensed to you
* under the terms of the GNU General Public License version 2, available at
* http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
*
* Notwithstanding the above, under no circumstances may you combine this
* software in any way with any other Broadcom software provided under a
* license other than the GPL, without Broadcom's express prior written
* consent.
*****************************************************************************/
#ifndef __SOUND_ARM_BCM2835_H
#define __SOUND_ARM_BCM2835_H
#include <linux/device.h>
#include <linux/list.h>
#include <linux/interrupt.h>
#include <linux/wait.h>
#include <sound/core.h>
#include <sound/initval.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/pcm-indirect.h>
#include <linux/workqueue.h>
/*
#define AUDIO_DEBUG_ENABLE
#define AUDIO_VERBOSE_DEBUG_ENABLE
*/
/* Debug macros */
#ifdef AUDIO_DEBUG_ENABLE
#ifdef AUDIO_VERBOSE_DEBUG_ENABLE
#define audio_debug(fmt, arg...) \
printk(KERN_INFO"%s:%d " fmt, __func__, __LINE__, ##arg)
#define audio_info(fmt, arg...) \
printk(KERN_INFO"%s:%d " fmt, __func__, __LINE__, ##arg)
#else
#define audio_debug(fmt, arg...)
#define audio_info(fmt, arg...)
#endif /* AUDIO_VERBOSE_DEBUG_ENABLE */
#else
#define audio_debug(fmt, arg...)
#define audio_info(fmt, arg...)
#endif /* AUDIO_DEBUG_ENABLE */
#define audio_error(fmt, arg...) \
printk(KERN_ERR"%s:%d " fmt, __func__, __LINE__, ##arg)
#define audio_warning(fmt, arg...) \
printk(KERN_WARNING"%s:%d " fmt, __func__, __LINE__, ##arg)
#define audio_alert(fmt, arg...) \
printk(KERN_ALERT"%s:%d " fmt, __func__, __LINE__, ##arg)
#define MAX_SUBSTREAMS (8)
#define AVAIL_SUBSTREAMS_MASK (0xff)
enum {
CTRL_VOL_MUTE,
CTRL_VOL_UNMUTE
};
/* macros for alsa2chip and chip2alsa, instead of functions */
#define alsa2chip(vol) (uint)(-((vol << 8) / 100)) /* convert alsa to chip volume (defined as macro rather than function call) */
#define chip2alsa(vol) -((vol * 100) >> 8) /* convert chip to alsa volume */
/* Some constants for values .. */
enum snd_bcm2835_route {
AUDIO_DEST_AUTO = 0,
AUDIO_DEST_HEADPHONES = 1,
AUDIO_DEST_HDMI = 2,
AUDIO_DEST_MAX,
};
enum snd_bcm2835_ctrl {
PCM_PLAYBACK_VOLUME,
PCM_PLAYBACK_MUTE,
PCM_PLAYBACK_DEVICE,
};
/* definition of the chip-specific record */
struct bcm2835_chip {
struct snd_card *card;
struct snd_pcm *pcm;
struct snd_pcm *pcm_spdif;
/* Bitmat for valid reg_base and irq numbers */
unsigned int avail_substreams;
struct platform_device *pdev[MAX_SUBSTREAMS];
struct bcm2835_alsa_stream *alsa_stream[MAX_SUBSTREAMS];
int volume;
int old_volume; /* stores the volume value whist muted */
int dest;
int mute;
unsigned int opened;
unsigned int spdif_status;
struct mutex audio_mutex;
};
struct bcm2835_alsa_stream {
struct bcm2835_chip *chip;
struct snd_pcm_substream *substream;
struct snd_pcm_indirect pcm_indirect;
struct semaphore buffers_update_sem;
struct semaphore control_sem;
spinlock_t lock;
volatile unsigned int control;
volatile unsigned int status;
int open;
int running;
int draining;
int channels;
int params_rate;
int pcm_format_width;
unsigned int pos;
unsigned int buffer_size;
unsigned int period_size;
unsigned int enable_fifo_irq;
irq_handler_t fifo_irq_handler;
atomic_t retrieved;
struct bcm2835_audio_instance *instance;
struct workqueue_struct *my_wq;
int idx;
};
int snd_bcm2835_new_ctl(struct bcm2835_chip *chip);
int snd_bcm2835_new_pcm(struct bcm2835_chip *chip);
int snd_bcm2835_new_spdif_pcm(struct bcm2835_chip *chip);
int bcm2835_audio_open(struct bcm2835_alsa_stream *alsa_stream);
int bcm2835_audio_close(struct bcm2835_alsa_stream *alsa_stream);
int bcm2835_audio_set_params(struct bcm2835_alsa_stream *alsa_stream,
unsigned int channels, unsigned int samplerate,
unsigned int bps);
int bcm2835_audio_setup(struct bcm2835_alsa_stream *alsa_stream);
int bcm2835_audio_start(struct bcm2835_alsa_stream *alsa_stream);
int bcm2835_audio_stop(struct bcm2835_alsa_stream *alsa_stream);
int bcm2835_audio_set_ctls(struct bcm2835_chip *chip);
int bcm2835_audio_write(struct bcm2835_alsa_stream *alsa_stream,
unsigned int count,
void *src);
unsigned int bcm2835_audio_retrieve_buffers(struct bcm2835_alsa_stream *alsa_stream);
void bcm2835_audio_flush_buffers(struct bcm2835_alsa_stream *alsa_stream);
void bcm2835_audio_flush_playback_buffers(struct bcm2835_alsa_stream *alsa_stream);
#endif /* __SOUND_ARM_BCM2835_H */

121
drivers/staging/bcm2835-audio/vc_vchi_audioserv_defs.h Normal file
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/*****************************************************************************
* Copyright 2011 Broadcom Corporation. All rights reserved.
*
* Unless you and Broadcom execute a separate written software license
* agreement governing use of this software, this software is licensed to you
* under the terms of the GNU General Public License version 2, available at
* http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
*
* Notwithstanding the above, under no circumstances may you combine this
* software in any way with any other Broadcom software provided under a
* license other than the GPL, without Broadcom's express prior written
* consent.
*****************************************************************************/
#ifndef _VC_AUDIO_DEFS_H_
#define _VC_AUDIO_DEFS_H_
#define VC_AUDIOSERV_MIN_VER 1
#define VC_AUDIOSERV_VER 2
/* FourCC code used for VCHI connection */
#define VC_AUDIO_SERVER_NAME MAKE_FOURCC("AUDS")
/* Maximum message length */
#define VC_AUDIO_MAX_MSG_LEN (sizeof( VC_AUDIO_MSG_T ))
/*
* List of screens that are currently supported
* All message types supported for HOST->VC direction
*/
enum vc_audio_msg_type {
VC_AUDIO_MSG_TYPE_RESULT, // Generic result
VC_AUDIO_MSG_TYPE_COMPLETE, // Generic result
VC_AUDIO_MSG_TYPE_CONFIG, // Configure audio
VC_AUDIO_MSG_TYPE_CONTROL, // Configure audio
VC_AUDIO_MSG_TYPE_OPEN, // Configure audio
VC_AUDIO_MSG_TYPE_CLOSE, // Configure audio
VC_AUDIO_MSG_TYPE_START, // Configure audio
VC_AUDIO_MSG_TYPE_STOP, // Configure audio
VC_AUDIO_MSG_TYPE_WRITE, // Configure audio
VC_AUDIO_MSG_TYPE_MAX
};
/* configure the audio */
struct vc_audio_config {
u32 channels;
u32 samplerate;
u32 bps;
};
struct vc_audio_control {
u32 volume;
u32 dest;
};
struct vc_audio_open {
u32 dummy;
};
struct vc_audio_close {
u32 dummy;
};
struct vc_audio_start {
u32 dummy;
};
struct vc_audio_stop {
u32 draining;
};
/* configure the write audio samples */
struct vc_audio_write {
u32 count; // in bytes
#if defined(CONFIG_64BIT)
u32 callbackl;
u32 callbackh;
#else
void *callback;
void *cookie;
#endif
s16 silence;
s16 max_packet;
};
/* Generic result for a request (VC->HOST) */
struct vc_audio_result {
s32 success; // Success value
};
/* Generic result for a request (VC->HOST) */
struct vc_audio_complete {
s32 count; // Success value
#if defined(CONFIG_64BIT)
u32 callbackl;
u32 callbackh;
#else
void *callback;
void *cookie;
#endif
};
/* Message header for all messages in HOST->VC direction */
struct vc_audio_msg {
s32 type; /* Message type (VC_AUDIO_MSG_TYPE) */
union {
struct vc_audio_config config;
struct vc_audio_control control;
struct vc_audio_open open;
struct vc_audio_close close;
struct vc_audio_start start;
struct vc_audio_stop stop;
struct vc_audio_write write;
struct vc_audio_result result;
struct vc_audio_complete complete;
} u;
};
#endif /* _VC_AUDIO_DEFS_H_ */