arch/arm/mach-msm/qdsp6v2/pcm_out.c - kernel/msm - Gitiles

 /*
  * Copyright (C) 2009 Google, Inc.
  * Copyright (c) 2010-2012, Code Aurora Forum. All rights reserved.
  * Author: Brian Swetland <swetland@google.com>
  *
  * This software is licensed under the terms of the GNU General Public
  * License version 2, as published by the Free Software Foundation, and
  * may be copied, distributed, and modified under those terms.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  */

 #include <linux/fs.h>
 #include <linux/module.h>
 #include <linux/miscdevice.h>
 #include <linux/mutex.h>
 #include <linux/sched.h>
 #include <linux/uaccess.h>
 #include <linux/wait.h>
 #include <linux/msm_audio.h>
 #include <linux/slab.h>
 #include <linux/wakelock.h>
 #include <asm/atomic.h>
 #include <sound/q6asm.h>
 #include <sound/apr_audio.h>
 #include <mach/debug_mm.h>
 #include <mach/qdsp6v2/audio_dev_ctl.h>

 #define MAX_BUF 2
 #define BUFSZ (4800)

 struct pcm {
 	struct mutex lock;
 	struct mutex write_lock;
 	spinlock_t   dsp_lock;
 	wait_queue_head_t write_wait;
 	struct audio_client *ac;
 	uint32_t sample_rate;
 	uint32_t channel_count;
 	uint32_t buffer_size;
 	uint32_t buffer_count;
 	uint32_t rec_mode;
 	uint32_t stream_event;
 	uint32_t volume;
 	atomic_t out_count;
 	atomic_t out_enabled;
 	atomic_t out_opened;
 	atomic_t out_stopped;
 	atomic_t out_prefill;
 	struct wake_lock wakelock;
 };

 void pcm_out_cb(uint32_t opcode, uint32_t token,
 			uint32_t *payload, void *priv)
 {
 	struct pcm *pcm = (struct pcm *) priv;
 	unsigned long flags;

 	spin_lock_irqsave(&pcm->dsp_lock, flags);
 	switch (opcode) {
 	case ASM_DATA_EVENT_WRITE_DONE:
 		atomic_inc(&pcm->out_count);
 		wake_up(&pcm->write_wait);
 		break;
 	case RESET_EVENTS:
 		reset_device();
 		break;
 	default:
 		break;
 	}
 	spin_unlock_irqrestore(&pcm->dsp_lock, flags);
 }

 static void audio_prevent_sleep(struct pcm *audio)
 {
 	pr_debug("%s:\n", __func__);
 	wake_lock(&audio->wakelock);
 }

 static void audio_allow_sleep(struct pcm *audio)
 {
 	pr_debug("%s:\n", __func__);
 	wake_unlock(&audio->wakelock);
 }

 static int pcm_out_enable(struct pcm *pcm)
 {
 	if (atomic_read(&pcm->out_enabled))
 		return 0;
 	return q6asm_run(pcm->ac, 0, 0, 0);
 }

 static int pcm_out_disable(struct pcm *pcm)
 {
 	int rc = 0;

 	if (atomic_read(&pcm->out_opened)) {
 		atomic_set(&pcm->out_enabled, 0);
 		atomic_set(&pcm->out_opened, 0);
 		rc = q6asm_cmd(pcm->ac, CMD_CLOSE);

 		atomic_set(&pcm->out_stopped, 1);
 		wake_up(&pcm->write_wait);
 	}
 	return rc;
 }

 static int config(struct pcm *pcm)
 {
 	int rc = 0;
 	if (!atomic_read(&pcm->out_prefill)) {
 		pr_debug("%s: pcm prefill\n", __func__);
 		rc = q6asm_audio_client_buf_alloc(IN, pcm->ac,
 				pcm->buffer_size, pcm->buffer_count);
 		if (rc < 0) {
 			pr_err("Audio Start: Buffer Allocation failed \
 							rc = %d\n", rc);
 			goto fail;
 		}

 		rc = q6asm_media_format_block_pcm(pcm->ac, pcm->sample_rate,
 							pcm->channel_count);
 		if (rc < 0)
 			pr_err("%s: CMD Format block failed\n", __func__);

 		atomic_set(&pcm->out_prefill, 1);
 		atomic_set(&pcm->out_count, pcm->buffer_count);
 	}
 fail:
 	return rc;
 }

 static void pcm_event_listner(u32 evt_id, union auddev_evt_data *evt_payload,
 							void *private_data)
 {
 	struct pcm *pcm = (struct pcm *) private_data;
 	int rc  = 0;

 	switch (evt_id) {
 	case AUDDEV_EVT_STREAM_VOL_CHG:
 		pcm->volume = evt_payload->session_vol;
 		pr_debug("%s: AUDDEV_EVT_STREAM_VOL_CHG, stream vol %d, "
 				"enabled = %d\n", __func__, pcm->volume,
 					atomic_read(&pcm->out_enabled));
 		if (atomic_read(&pcm->out_enabled)) {
 			if (pcm->ac) {
 				rc = q6asm_set_volume(pcm->ac, pcm->volume);
 				if (rc < 0)
 					pr_err("%s: Send Volume command"
 					"failed rc=%d\n", __func__, rc);
 			}
 		}
 		break;
 	default:
 		pr_err("%s:ERROR:wrong event\n", __func__);
 		break;
 	}
 }

 static long pcm_out_ioctl(struct file *file, unsigned int cmd,
 				unsigned long arg)
 {
 	struct pcm *pcm = file->private_data;
 	int rc = 0;

 	if (cmd == AUDIO_GET_STATS) {
 		struct msm_audio_stats stats;
 		memset(&stats, 0, sizeof(stats));
 		if (copy_to_user((void *) arg, &stats, sizeof(stats)))
 			return -EFAULT;
 		return 0;
 	}

 	mutex_lock(&pcm->lock);
 	switch (cmd) {
 	case AUDIO_SET_VOLUME: {
 		int vol;
 		if (copy_from_user(&vol, (void *) arg, sizeof(vol))) {
 			rc = -EFAULT;
 			break;
 		}
 		break;
 	}
 	case AUDIO_START: {
 		pr_info("%s: AUDIO_START\n", __func__);
 		rc = config(pcm);
 		if (rc) {
 			pr_err("%s: Out Configuration failed\n", __func__);
 			rc = -EFAULT;
 			break;
 		}

 		rc = pcm_out_enable(pcm);
 		if (rc) {
 			pr_err("Out enable failed\n");
 			rc = -EFAULT;
 			break;
 		}
 		audio_prevent_sleep(pcm);
 		atomic_set(&pcm->out_enabled, 1);

 		rc = q6asm_set_volume(pcm->ac, pcm->volume);
 		if (rc < 0)
 			pr_err("%s: Send Volume command failed rc=%d\n",
 							__func__, rc);
 		rc = q6asm_set_lrgain(pcm->ac, 0x2000, 0x2000);
 		if (rc < 0)
 			pr_err("%s: Send channel gain failed rc=%d\n",
 							__func__, rc);
 		/* disable mute by default */
 		rc = q6asm_set_mute(pcm->ac, 0);
 		if (rc < 0)
 			pr_err("%s: Send mute command failed rc=%d\n",
 							__func__, rc);
 		break;
 	}
 	case AUDIO_GET_SESSION_ID: {
 		if (copy_to_user((void *) arg, &pcm->ac->session,
 					sizeof(unsigned short)))
 			rc = -EFAULT;
 		break;
 	}
 	case AUDIO_STOP:
 		break;
 	case AUDIO_FLUSH:
 		break;
 	case AUDIO_SET_CONFIG: {
 		struct msm_audio_config config;
 		pr_debug("%s: AUDIO_SET_CONFIG\n", __func__);
 		if (copy_from_user(&config, (void *) arg, sizeof(config))) {
 			rc = -EFAULT;
 			break;
 		}
 		if (config.channel_count < 1 || config.channel_count > 2) {
 			rc = -EINVAL;
 			break;
 		}
 		if (config.sample_rate < 8000 || config.sample_rate > 48000) {
 			rc = -EINVAL;
 			break;
 		}
 		if (config.buffer_size < 128) {
 			rc = -EINVAL;
 			break;
 		}
 		pcm->sample_rate = config.sample_rate;
 		pcm->channel_count = config.channel_count;
 		pcm->buffer_size = config.buffer_size;
 		pcm->buffer_count = config.buffer_count;
 		pr_debug("%s:buffer_size:%d buffer_count:%d sample_rate:%d \
 			channel_count:%d\n",  __func__, pcm->buffer_size,
 			pcm->buffer_count, pcm->sample_rate,
 			pcm->channel_count);
 		break;
 	}
 	case AUDIO_GET_CONFIG: {
 		struct msm_audio_config config;
 		pr_debug("%s: AUDIO_GET_CONFIG\n", __func__);
 		config.buffer_size = pcm->buffer_size;
 		config.buffer_count = pcm->buffer_count;
 		config.sample_rate = pcm->sample_rate;
 		config.channel_count = pcm->channel_count;
 		config.unused[0] = 0;
 		config.unused[1] = 0;
 		config.unused[2] = 0;
 		if (copy_to_user((void *) arg, &config, sizeof(config)))
 			rc = -EFAULT;
 		break;
 	}
 	case AUDIO_SET_EQ: {
 		struct msm_audio_eq_stream_config eq_config;
 		if (copy_from_user(&eq_config, (void *) arg,
 						sizeof(eq_config))) {
 			rc = -EFAULT;
 			break;
 		}
 		rc = q6asm_equalizer(pcm->ac, (void *) &eq_config);
 		if (rc < 0)
 			pr_err("%s: EQUALIZER FAILED\n", __func__);
 		break;
 	}
 	default:
 		rc = -EINVAL;
 	}
 	mutex_unlock(&pcm->lock);
 	return rc;
 }

 static int pcm_out_open(struct inode *inode, struct file *file)
 {
 	struct pcm *pcm;
 	int rc = 0;
 	char name[24];

 	pr_info("[%s:%s] open\n", __MM_FILE__, __func__);
 	pcm = kzalloc(sizeof(struct pcm), GFP_KERNEL);
 	if (!pcm) {
 		pr_err("%s: Failed to allocated memory\n", __func__);
 		return -ENOMEM;
 	}

 	pcm->channel_count = 2;
 	pcm->sample_rate = 44100;
 	pcm->buffer_size = BUFSZ;
 	pcm->buffer_count = MAX_BUF;
 	pcm->stream_event = AUDDEV_EVT_STREAM_VOL_CHG;
 	pcm->volume = 0x2000;

 	pcm->ac = q6asm_audio_client_alloc((app_cb)pcm_out_cb, (void *)pcm);
 	if (!pcm->ac) {
 		pr_err("%s: Could not allocate memory\n", __func__);
 		rc = -ENOMEM;
 		goto fail;
 	}

 	rc = q6asm_open_write(pcm->ac, FORMAT_LINEAR_PCM);
 	if (rc < 0) {
 		pr_err("%s: pcm out open failed for session %d\n", __func__,
 			pcm->ac->session);
 		rc = -EINVAL;
 		goto fail;
 	}

 	mutex_init(&pcm->lock);
 	mutex_init(&pcm->write_lock);
 	init_waitqueue_head(&pcm->write_wait);
 	spin_lock_init(&pcm->dsp_lock);
 	atomic_set(&pcm->out_enabled, 0);
 	atomic_set(&pcm->out_stopped, 0);
 	atomic_set(&pcm->out_count, pcm->buffer_count);
 	atomic_set(&pcm->out_prefill, 0);
 	atomic_set(&pcm->out_opened, 1);
 	snprintf(name, sizeof name, "audio_pcm_%x", pcm->ac->session);
 	wake_lock_init(&pcm->wakelock, WAKE_LOCK_SUSPEND, name);

 	rc = auddev_register_evt_listner(pcm->stream_event,
 					AUDDEV_CLNT_DEC,
 					pcm->ac->session,
 					pcm_event_listner,
 					(void *)pcm);
 	if (rc < 0) {
 		pr_err("%s: failed to register listner\n", __func__);
 		goto fail;
 	}

 	file->private_data = pcm;
 	pr_info("[%s:%s] open session id[%d]\n", __MM_FILE__,
 				__func__, pcm->ac->session);
 	return 0;
 fail:
 	if (pcm->ac)
 		q6asm_audio_client_free(pcm->ac);
 	kfree(pcm);
 	return rc;
 }

 static ssize_t pcm_out_write(struct file *file, const char __user *buf,
 					size_t count, loff_t *pos)
 {
 	struct pcm *pcm = file->private_data;
 	const char __user *start = buf;
 	int xfer;
 	char *bufptr;
 	uint32_t idx;
 	void *data;
 	int rc = 0;
 	uint32_t size;

 	if (!pcm->ac)
 		return -ENODEV;

 	if (!atomic_read(&pcm->out_enabled)) {
 		rc = config(pcm);
 		if (rc < 0)
 			return rc;
 	}

 	mutex_lock(&pcm->write_lock);
 	while (count > 0) {
 		rc = wait_event_timeout(pcm->write_wait,
 				(atomic_read(&pcm->out_count) ||
 				atomic_read(&pcm->out_stopped)), 1 * HZ);
 		if (!rc) {
 			pr_err("%s: wait_event_timeout failed for session %d\n",
 				__func__, pcm->ac->session);
 			goto fail;
 		}

 		if (atomic_read(&pcm->out_stopped) &&
 					!atomic_read(&pcm->out_count)) {
 			pr_info("%s: pcm stopped out_count 0\n", __func__);
 			mutex_unlock(&pcm->write_lock);
 			return 0;
 		}

 		data = q6asm_is_cpu_buf_avail(IN, pcm->ac, &size, &idx);
 		bufptr = data;
 		if (bufptr) {
 			xfer = count;
 			if (xfer > BUFSZ)
 				xfer = BUFSZ;

 			if (copy_from_user(bufptr, buf, xfer)) {
 				rc = -EFAULT;
 				goto fail;
 			}
 			buf += xfer;
 			count -= xfer;
 			rc = q6asm_write(pcm->ac, xfer, 0, 0, NO_TIMESTAMP);
 			wmb();
 			if (rc < 0) {
 				rc = -EFAULT;
 				goto fail;
 			}
 		}
 		atomic_dec(&pcm->out_count);
 	}

 	rc = buf - start;
 fail:
 	mutex_unlock(&pcm->write_lock);
 	return rc;
 }

 static int pcm_out_release(struct inode *inode, struct file *file)
 {
 	struct pcm *pcm = file->private_data;

 	pr_info("[%s:%s] release session id[%d]\n", __MM_FILE__,
 				__func__, pcm->ac->session);
 	if (pcm->ac)
 		pcm_out_disable(pcm);
 	msm_clear_session_id(pcm->ac->session);
 	auddev_unregister_evt_listner(AUDDEV_CLNT_DEC, pcm->ac->session);
 	q6asm_audio_client_free(pcm->ac);
 	audio_allow_sleep(pcm);
 	wake_lock_destroy(&pcm->wakelock);
 	mutex_destroy(&pcm->lock);
 	mutex_destroy(&pcm->write_lock);
 	kfree(pcm);
 	return 0;
 }

 static const struct file_operations pcm_out_fops = {
 	.owner		= THIS_MODULE,
 	.open		= pcm_out_open,
 	.write		= pcm_out_write,
 	.release	= pcm_out_release,
 	.unlocked_ioctl	= pcm_out_ioctl,
 };

 struct miscdevice pcm_out_misc = {
 	.minor	= MISC_DYNAMIC_MINOR,
 	.name	= "msm_pcm_out",
 	.fops	= &pcm_out_fops,
 };

 static int __init pcm_out_init(void)
 {
 	return misc_register(&pcm_out_misc);
 }

 device_initcall(pcm_out_init);
	/*
	* Copyright (C) 2009 Google, Inc.
	* Copyright (c) 2010-2012, Code Aurora Forum. All rights reserved.
	* Author: Brian Swetland <swetland@google.com>
	*
	* This software is licensed under the terms of the GNU General Public
	* License version 2, as published by the Free Software Foundation, and
	* may be copied, distributed, and modified under those terms.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	*/

	#include <linux/fs.h>
	#include <linux/module.h>
	#include <linux/miscdevice.h>
	#include <linux/mutex.h>
	#include <linux/sched.h>
	#include <linux/uaccess.h>
	#include <linux/wait.h>
	#include <linux/msm_audio.h>
	#include <linux/slab.h>
	#include <linux/wakelock.h>
	#include <asm/atomic.h>
	#include <sound/q6asm.h>
	#include <sound/apr_audio.h>
	#include <mach/debug_mm.h>
	#include <mach/qdsp6v2/audio_dev_ctl.h>

	#define MAX_BUF 2
	#define BUFSZ (4800)

	struct pcm {
	struct mutex lock;
	struct mutex write_lock;
	spinlock_t dsp_lock;
	wait_queue_head_t write_wait;
	struct audio_client *ac;
	uint32_t sample_rate;
	uint32_t channel_count;
	uint32_t buffer_size;
	uint32_t buffer_count;
	uint32_t rec_mode;
	uint32_t stream_event;
	uint32_t volume;
	atomic_t out_count;
	atomic_t out_enabled;
	atomic_t out_opened;
	atomic_t out_stopped;
	atomic_t out_prefill;
	struct wake_lock wakelock;
	};

	void pcm_out_cb(uint32_t opcode, uint32_t token,
	uint32_t payload, void priv)
	{
	struct pcm pcm = (struct pcm ) priv;
	unsigned long flags;

	spin_lock_irqsave(&pcm->dsp_lock, flags);
	switch (opcode) {
	case ASM_DATA_EVENT_WRITE_DONE:
	atomic_inc(&pcm->out_count);
	wake_up(&pcm->write_wait);
	break;
	case RESET_EVENTS:
	reset_device();
	break;
	default:
	break;
	}
	spin_unlock_irqrestore(&pcm->dsp_lock, flags);
	}

	static void audio_prevent_sleep(struct pcm *audio)
	{
	pr_debug("%s:\n", __func__);
	wake_lock(&audio->wakelock);
	}

	static void audio_allow_sleep(struct pcm *audio)
	{
	pr_debug("%s:\n", __func__);
	wake_unlock(&audio->wakelock);
	}

	static int pcm_out_enable(struct pcm *pcm)
	{
	if (atomic_read(&pcm->out_enabled))
	return 0;
	return q6asm_run(pcm->ac, 0, 0, 0);
	}

	static int pcm_out_disable(struct pcm *pcm)
	{
	int rc = 0;

	if (atomic_read(&pcm->out_opened)) {
	atomic_set(&pcm->out_enabled, 0);
	atomic_set(&pcm->out_opened, 0);
	rc = q6asm_cmd(pcm->ac, CMD_CLOSE);

	atomic_set(&pcm->out_stopped, 1);
	wake_up(&pcm->write_wait);
	}
	return rc;
	}

	static int config(struct pcm *pcm)
	{
	int rc = 0;
	if (!atomic_read(&pcm->out_prefill)) {
	pr_debug("%s: pcm prefill\n", __func__);
	rc = q6asm_audio_client_buf_alloc(IN, pcm->ac,
	pcm->buffer_size, pcm->buffer_count);
	if (rc < 0) {
	pr_err("Audio Start: Buffer Allocation failed \
	rc = %d\n", rc);
	goto fail;
	}

	rc = q6asm_media_format_block_pcm(pcm->ac, pcm->sample_rate,
	pcm->channel_count);
	if (rc < 0)
	pr_err("%s: CMD Format block failed\n", __func__);

	atomic_set(&pcm->out_prefill, 1);
	atomic_set(&pcm->out_count, pcm->buffer_count);
	}
	fail:
	return rc;
	}

	static void pcm_event_listner(u32 evt_id, union auddev_evt_data *evt_payload,
	void *private_data)
	{
	struct pcm pcm = (struct pcm ) private_data;
	int rc = 0;

	switch (evt_id) {
	case AUDDEV_EVT_STREAM_VOL_CHG:
	pcm->volume = evt_payload->session_vol;
	pr_debug("%s: AUDDEV_EVT_STREAM_VOL_CHG, stream vol %d, "
	"enabled = %d\n", __func__, pcm->volume,
	atomic_read(&pcm->out_enabled));
	if (atomic_read(&pcm->out_enabled)) {
	if (pcm->ac) {
	rc = q6asm_set_volume(pcm->ac, pcm->volume);
	if (rc < 0)
	pr_err("%s: Send Volume command"
	"failed rc=%d\n", __func__, rc);
	}
	}
	break;
	default:
	pr_err("%s:ERROR:wrong event\n", __func__);
	break;
	}
	}

	static long pcm_out_ioctl(struct file *file, unsigned int cmd,
	unsigned long arg)
	{
	struct pcm *pcm = file->private_data;
	int rc = 0;

	if (cmd == AUDIO_GET_STATS) {
	struct msm_audio_stats stats;
	memset(&stats, 0, sizeof(stats));
	if (copy_to_user((void *) arg, &stats, sizeof(stats)))
	return -EFAULT;
	return 0;
	}

	mutex_lock(&pcm->lock);
	switch (cmd) {
	case AUDIO_SET_VOLUME: {
	int vol;
	if (copy_from_user(&vol, (void *) arg, sizeof(vol))) {
	rc = -EFAULT;
	break;
	}
	break;
	}
	case AUDIO_START: {
	pr_info("%s: AUDIO_START\n", __func__);
	rc = config(pcm);
	if (rc) {
	pr_err("%s: Out Configuration failed\n", __func__);
	rc = -EFAULT;
	break;
	}

	rc = pcm_out_enable(pcm);
	if (rc) {
	pr_err("Out enable failed\n");
	rc = -EFAULT;
	break;
	}
	audio_prevent_sleep(pcm);
	atomic_set(&pcm->out_enabled, 1);

	rc = q6asm_set_volume(pcm->ac, pcm->volume);
	if (rc < 0)
	pr_err("%s: Send Volume command failed rc=%d\n",
	__func__, rc);
	rc = q6asm_set_lrgain(pcm->ac, 0x2000, 0x2000);
	if (rc < 0)
	pr_err("%s: Send channel gain failed rc=%d\n",
	__func__, rc);
	/* disable mute by default */
	rc = q6asm_set_mute(pcm->ac, 0);
	if (rc < 0)
	pr_err("%s: Send mute command failed rc=%d\n",
	__func__, rc);
	break;
	}
	case AUDIO_GET_SESSION_ID: {
	if (copy_to_user((void *) arg, &pcm->ac->session,
	sizeof(unsigned short)))
	rc = -EFAULT;
	break;
	}
	case AUDIO_STOP:
	break;
	case AUDIO_FLUSH:
	break;
	case AUDIO_SET_CONFIG: {
	struct msm_audio_config config;
	pr_debug("%s: AUDIO_SET_CONFIG\n", __func__);
	if (copy_from_user(&config, (void *) arg, sizeof(config))) {
	rc = -EFAULT;
	break;
	}
	if (config.channel_count < 1 \|\| config.channel_count > 2) {
	rc = -EINVAL;
	break;
	}
	if (config.sample_rate < 8000 \|\| config.sample_rate > 48000) {
	rc = -EINVAL;
	break;
	}
	if (config.buffer_size < 128) {
	rc = -EINVAL;
	break;
	}
	pcm->sample_rate = config.sample_rate;
	pcm->channel_count = config.channel_count;
	pcm->buffer_size = config.buffer_size;
	pcm->buffer_count = config.buffer_count;
	pr_debug("%s:buffer_size:%d buffer_count:%d sample_rate:%d \
	channel_count:%d\n", __func__, pcm->buffer_size,
	pcm->buffer_count, pcm->sample_rate,
	pcm->channel_count);
	break;
	}
	case AUDIO_GET_CONFIG: {
	struct msm_audio_config config;
	pr_debug("%s: AUDIO_GET_CONFIG\n", __func__);
	config.buffer_size = pcm->buffer_size;
	config.buffer_count = pcm->buffer_count;
	config.sample_rate = pcm->sample_rate;
	config.channel_count = pcm->channel_count;
	config.unused[0] = 0;
	config.unused[1] = 0;
	config.unused[2] = 0;
	if (copy_to_user((void *) arg, &config, sizeof(config)))
	rc = -EFAULT;
	break;
	}
	case AUDIO_SET_EQ: {
	struct msm_audio_eq_stream_config eq_config;
	if (copy_from_user(&eq_config, (void *) arg,
	sizeof(eq_config))) {
	rc = -EFAULT;
	break;
	}
	rc = q6asm_equalizer(pcm->ac, (void *) &eq_config);
	if (rc < 0)
	pr_err("%s: EQUALIZER FAILED\n", __func__);
	break;
	}
	default:
	rc = -EINVAL;
	}
	mutex_unlock(&pcm->lock);
	return rc;
	}

	static int pcm_out_open(struct inode inode, struct file file)
	{
	struct pcm *pcm;
	int rc = 0;
	char name[24];

	pr_info("[%s:%s] open\n", __MM_FILE__, __func__);
	pcm = kzalloc(sizeof(struct pcm), GFP_KERNEL);
	if (!pcm) {
	pr_err("%s: Failed to allocated memory\n", __func__);
	return -ENOMEM;
	}

	pcm->channel_count = 2;
	pcm->sample_rate = 44100;
	pcm->buffer_size = BUFSZ;
	pcm->buffer_count = MAX_BUF;
	pcm->stream_event = AUDDEV_EVT_STREAM_VOL_CHG;
	pcm->volume = 0x2000;

	pcm->ac = q6asm_audio_client_alloc((app_cb)pcm_out_cb, (void *)pcm);
	if (!pcm->ac) {
	pr_err("%s: Could not allocate memory\n", __func__);
	rc = -ENOMEM;
	goto fail;
	}

	rc = q6asm_open_write(pcm->ac, FORMAT_LINEAR_PCM);
	if (rc < 0) {
	pr_err("%s: pcm out open failed for session %d\n", __func__,
	pcm->ac->session);
	rc = -EINVAL;
	goto fail;
	}

	mutex_init(&pcm->lock);
	mutex_init(&pcm->write_lock);
	init_waitqueue_head(&pcm->write_wait);
	spin_lock_init(&pcm->dsp_lock);
	atomic_set(&pcm->out_enabled, 0);
	atomic_set(&pcm->out_stopped, 0);
	atomic_set(&pcm->out_count, pcm->buffer_count);
	atomic_set(&pcm->out_prefill, 0);
	atomic_set(&pcm->out_opened, 1);
	snprintf(name, sizeof name, "audio_pcm_%x", pcm->ac->session);
	wake_lock_init(&pcm->wakelock, WAKE_LOCK_SUSPEND, name);

	rc = auddev_register_evt_listner(pcm->stream_event,
	AUDDEV_CLNT_DEC,
	pcm->ac->session,
	pcm_event_listner,
	(void *)pcm);
	if (rc < 0) {
	pr_err("%s: failed to register listner\n", __func__);
	goto fail;
	}

	file->private_data = pcm;
	pr_info("[%s:%s] open session id[%d]\n", __MM_FILE__,
	__func__, pcm->ac->session);
	return 0;
	fail:
	if (pcm->ac)
	q6asm_audio_client_free(pcm->ac);
	kfree(pcm);
	return rc;
	}

	static ssize_t pcm_out_write(struct file file, const char __user buf,
	size_t count, loff_t *pos)
	{
	struct pcm *pcm = file->private_data;
	const char __user *start = buf;
	int xfer;
	char *bufptr;
	uint32_t idx;
	void *data;
	int rc = 0;
	uint32_t size;

	if (!pcm->ac)
	return -ENODEV;

	if (!atomic_read(&pcm->out_enabled)) {
	rc = config(pcm);
	if (rc < 0)
	return rc;
	}

	mutex_lock(&pcm->write_lock);
	while (count > 0) {
	rc = wait_event_timeout(pcm->write_wait,
	(atomic_read(&pcm->out_count) \|\|
	atomic_read(&pcm->out_stopped)), 1 * HZ);
	if (!rc) {
	pr_err("%s: wait_event_timeout failed for session %d\n",
	__func__, pcm->ac->session);
	goto fail;
	}

	if (atomic_read(&pcm->out_stopped) &&
	!atomic_read(&pcm->out_count)) {
	pr_info("%s: pcm stopped out_count 0\n", __func__);
	mutex_unlock(&pcm->write_lock);
	return 0;
	}

	data = q6asm_is_cpu_buf_avail(IN, pcm->ac, &size, &idx);
	bufptr = data;
	if (bufptr) {
	xfer = count;
	if (xfer > BUFSZ)
	xfer = BUFSZ;

	if (copy_from_user(bufptr, buf, xfer)) {
	rc = -EFAULT;
	goto fail;
	}
	buf += xfer;
	count -= xfer;
	rc = q6asm_write(pcm->ac, xfer, 0, 0, NO_TIMESTAMP);
	wmb();
	if (rc < 0) {
	rc = -EFAULT;
	goto fail;
	}
	}
	atomic_dec(&pcm->out_count);
	}

	rc = buf - start;
	fail:
	mutex_unlock(&pcm->write_lock);
	return rc;
	}

	static int pcm_out_release(struct inode inode, struct file file)
	{
	struct pcm *pcm = file->private_data;

	pr_info("[%s:%s] release session id[%d]\n", __MM_FILE__,
	__func__, pcm->ac->session);
	if (pcm->ac)
	pcm_out_disable(pcm);
	msm_clear_session_id(pcm->ac->session);
	auddev_unregister_evt_listner(AUDDEV_CLNT_DEC, pcm->ac->session);
	q6asm_audio_client_free(pcm->ac);
	audio_allow_sleep(pcm);
	wake_lock_destroy(&pcm->wakelock);
	mutex_destroy(&pcm->lock);
	mutex_destroy(&pcm->write_lock);
	kfree(pcm);
	return 0;
	}

	static const struct file_operations pcm_out_fops = {
	.owner = THIS_MODULE,
	.open = pcm_out_open,
	.write = pcm_out_write,
	.release = pcm_out_release,
	.unlocked_ioctl = pcm_out_ioctl,
	};

	struct miscdevice pcm_out_misc = {
	.minor = MISC_DYNAMIC_MINOR,
	.name = "msm_pcm_out",
	.fops = &pcm_out_fops,
	};

	static int __init pcm_out_init(void)
	{
	return misc_register(&pcm_out_misc);
	}

	device_initcall(pcm_out_init);