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Commit 23b028c8 authored by Michael Zoran's avatar Michael Zoran Committed by Greg Kroah-Hartman
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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: default avatarMichael Zoran <mzoran@crowfest.net>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent e7b56b14

drivers/staging/Kconfig

+2 −0
Original line number Diff line number Diff line
@@ -102,4 +102,6 @@ source "drivers/staging/greybus/Kconfig" 


source "drivers/staging/vc04_services/Kconfig"



source "drivers/staging/bcm2835-audio/Kconfig"



endif # STAGING

drivers/staging/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -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/

drivers/staging/bcm2835-audio/Kconfig

0 → 100644
+7 −0
Original line number Diff line number Diff line 
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

drivers/staging/bcm2835-audio/Makefile

0 → 100644
+5 −0
Original line number Diff line number Diff line 
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

drivers/staging/bcm2835-audio/bcm2835-ctl.c

0 → 100644
+346 −0
Original line number Diff line number Diff line 
/*****************************************************************************

 * 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;

}