arch/arm/mach-msm/qdsp6/aac_in.c - kernel/msm - Git at Google

 /*
  * Copyright (C) 2009 Google, Inc.
  * Copyright (C) 2009 HTC Corporation
  * Copyright (c) 2010, The Linux Foundation. All rights reserved.
  *
  * 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/slab.h>
 #include <linux/fs.h>
 #include <linux/module.h>
 #include <linux/miscdevice.h>
 #include <linux/mutex.h>
 #include <linux/sched.h>
 #include <linux/wait.h>
 #include <linux/uaccess.h>
 #include <linux/kthread.h>
 #include <linux/time.h>
 #include <linux/wait.h>

 #include <linux/msm_audio.h>
 #include <linux/msm_audio_aac.h>
 #include <mach/msm_qdsp6_audio.h>
 #include <mach/debug_mm.h>

 #define AAC_FC_BUFF_CNT 10
 #define AAC_READ_TIMEOUT 2000
 struct aac_fc_buff {
 	struct mutex lock;
 	int empty;
 	void *data;
 	int size;
 	int actual_size;
 };

 struct aac_fc {
 	struct task_struct *task;
 	wait_queue_head_t fc_wq;
 	struct aac_fc_buff fc_buff[AAC_FC_BUFF_CNT];
 	int buff_index;
 };
 struct aac {
 	struct mutex lock;
 	struct msm_audio_aac_enc_config cfg;
 	struct msm_audio_stream_config str_cfg;
 	struct audio_client *audio_client;
 	struct msm_voicerec_mode voicerec_mode;
 	struct aac_fc *aac_fc;
 };

 static int q6_aac_flowcontrol(void *data)
 {
 	struct audio_client *ac;
 	struct audio_buffer *ab;
 	struct aac *aac = data;
 	int buff_index = 0;
 	int xfer = 0;
 	struct aac_fc *fc;


 	ac = aac->audio_client;
 	fc = aac->aac_fc;
 	if (!ac) {
 		pr_err("[%s:%s] audio_client is NULL\n", __MM_FILE__, __func__);
 		return 0;
 	}

 	while (!kthread_should_stop()) {
 		ab = ac->buf + ac->cpu_buf;
 		if (ab->used)
 			wait_event(ac->wait, (ab->used == 0));
 		pr_debug("[%s:%s] ab->data = %p, cpu_buf = %d\n", __MM_FILE__,
 			 __func__, ab->data, ac->cpu_buf);
 		xfer = ab->actual_size;

 		mutex_lock(&(fc->fc_buff[buff_index].lock));
 		if (!fc->fc_buff[buff_index].empty) {
 			pr_err("[%s:%s] flow control buffer[%d] not read!\n",
 					__MM_FILE__, __func__, buff_index);
 		}

 		if (fc->fc_buff[buff_index].size < xfer) {
 			pr_err("[%s:%s] buffer %d too small\n", __MM_FILE__,
 					__func__, buff_index);
 			memcpy(fc->fc_buff[buff_index].data,
 				ab->data, fc->fc_buff[buff_index].size);
 			fc->fc_buff[buff_index].empty = 0;
 			fc->fc_buff[buff_index].actual_size =
 				fc->fc_buff[buff_index].size;
 		} else {
 			memcpy(fc->fc_buff[buff_index].data, ab->data, xfer);
 			fc->fc_buff[buff_index].empty = 0;
 			fc->fc_buff[buff_index].actual_size = xfer;
 		}
 		mutex_unlock(&(fc->fc_buff[buff_index].lock));
 		/*wake up client, if any*/
 		wake_up(&fc->fc_wq);

 		buff_index++;
 		if (buff_index >= AAC_FC_BUFF_CNT)
 			buff_index = 0;

 		ab->used = 1;

 		q6audio_read(ac, ab);
 		ac->cpu_buf ^= 1;
 	}

 	return 0;
 }
 static long q6_aac_in_ioctl(struct file *file,
 				 unsigned int cmd, unsigned long arg)
 {
 	struct aac *aac = file->private_data;
 	int rc = 0;
 	int i = 0;
 	struct aac_fc *fc;
 	int size = 0;

 	mutex_lock(&aac->lock);
 	switch (cmd) {
 	case AUDIO_SET_VOLUME:
 		break;
 	case AUDIO_GET_STATS:
 	{
 		struct msm_audio_stats stats;
 		pr_debug("[%s:%s] GET_STATS\n", __MM_FILE__, __func__);
 		memset(&stats, 0, sizeof(stats));
 		if (copy_to_user((void *) arg, &stats, sizeof(stats)))
 			return -EFAULT;
 		return 0;
 	}
 	case AUDIO_START:
 	{
 		uint32_t acdb_id;
 		pr_debug("[%s:%s] AUDIO_START\n", __MM_FILE__, __func__);
 		if (arg == 0) {
 			acdb_id = 0;
 		} else {
 			if (copy_from_user(&acdb_id, (void *) arg,
 					sizeof(acdb_id))) {
 				rc = -EFAULT;
 				break;
 			}
 		}
 		if (aac->audio_client) {
 			rc = -EBUSY;
 			pr_err("[%s:%s] active session already existing\n",
 				__MM_FILE__, __func__);
 			break;
 		} else {
 			aac->audio_client = q6audio_open_aac(
 					aac->str_cfg.buffer_size,
 					aac->cfg.sample_rate,
 					aac->cfg.channels,
 					aac->cfg.bit_rate,
 					aac->cfg.stream_format,
 					aac->voicerec_mode.rec_mode, acdb_id);

 			if (aac->audio_client < 0) {
 				pr_err("[%s:%s] aac open session failed\n",
 					__MM_FILE__, __func__);
 				rc = -ENOMEM;
 				break;
 			}
 		}

 		/*allocate flow control buffers*/
 		fc = aac->aac_fc;
 		size = ((aac->str_cfg.buffer_size < 1543) ? 1543 :
 				aac->str_cfg.buffer_size);
 		for (i = 0; i < AAC_FC_BUFF_CNT; ++i) {
 			mutex_init(&(fc->fc_buff[i].lock));
 			fc->fc_buff[i].empty = 1;
 			fc->fc_buff[i].data = kmalloc(size, GFP_KERNEL);
 			if (fc->fc_buff[i].data == NULL) {
 				pr_err("[%s:%s] No memory for FC buffers\n",
 						__MM_FILE__, __func__);
 				rc = -ENOMEM;
 				goto fc_fail;
 			}
 			fc->fc_buff[i].size = size;
 			fc->fc_buff[i].actual_size = 0;
 		}

 		/*create flow control thread*/
 		fc->task = kthread_run(q6_aac_flowcontrol,
 				aac, "aac_flowcontrol");
 		if (IS_ERR(fc->task)) {
 			rc = PTR_ERR(fc->task);
 			pr_err("[%s:%s] error creating flow control thread\n",
 					__MM_FILE__, __func__);
 			goto fc_fail;
 		}
 		break;
 fc_fail:
 		/*free flow control buffers*/
 		--i;
 		for (; i >=  0; i--) {
 			kfree(fc->fc_buff[i].data);
 			fc->fc_buff[i].data = NULL;
 		}
 		break;
 	}
 	case AUDIO_STOP:
 		pr_debug("[%s:%s] AUDIO_STOP\n", __MM_FILE__, __func__);
 		break;
 	case AUDIO_FLUSH:
 		break;
 	case AUDIO_SET_INCALL: {
 		pr_debug("[%s:%s] SET_INCALL\n", __MM_FILE__, __func__);
 		if (copy_from_user(&aac->voicerec_mode,
 			(void *)arg, sizeof(struct msm_voicerec_mode)))
 			rc = -EFAULT;

 		if (aac->voicerec_mode.rec_mode != AUDIO_FLAG_READ
 			&& aac->voicerec_mode.rec_mode !=
 			AUDIO_FLAG_INCALL_MIXED) {
 			aac->voicerec_mode.rec_mode = AUDIO_FLAG_READ;
 			pr_err("[%s:%s] Invalid rec_mode\n", __MM_FILE__,
 					__func__);
 			rc = -EINVAL;
 		}
 		break;
 	}
 	case AUDIO_GET_STREAM_CONFIG:
 		if (copy_to_user((void *)arg, &aac->str_cfg,
 			sizeof(struct msm_audio_stream_config)))
 			rc = -EFAULT;
 		pr_debug("[%s:%s] GET_STREAM_CONFIG: buffsz=%d, buffcnt=%d\n",
 			 __MM_FILE__, __func__, aac->str_cfg.buffer_size,
 			aac->str_cfg.buffer_count);
 		break;
 	case AUDIO_SET_STREAM_CONFIG:
 		if (copy_from_user(&aac->str_cfg, (void *)arg,
 			sizeof(struct msm_audio_stream_config))) {
 			rc = -EFAULT;
 			break;
 		}
 		pr_debug("[%s:%s] SET_STREAM_CONFIG: buffsz=%d, buffcnt=%d\n",
 			 __MM_FILE__, __func__, aac->str_cfg.buffer_size,
 			aac->str_cfg.buffer_count);
 		if (aac->str_cfg.buffer_size < 1543) {
 			pr_err("[%s:%s] Buffer size too small\n", __MM_FILE__,
 					__func__);
 			rc = -EINVAL;
 			break;
 		}
 		if (aac->str_cfg.buffer_count != 2)
 			pr_info("[%s:%s] Buffer count set to 2\n", __MM_FILE__,
 					__func__);

 		break;
 	case AUDIO_SET_AAC_ENC_CONFIG:
 		if (copy_from_user(&aac->cfg, (void *) arg,
 				 sizeof(struct msm_audio_aac_enc_config))) {
 			rc = -EFAULT;
 		}
 		pr_debug("[%s:%s] SET_AAC_ENC_CONFIG: channels=%d, rate=%d\n",
 			__MM_FILE__, __func__, aac->cfg.channels,
 			aac->cfg.sample_rate);
 		if (aac->cfg.channels < 1 || aac->cfg.channels > 2) {
 			pr_err("[%s:%s]invalid number of channels\n",
 				 __MM_FILE__, __func__);
 			rc = -EINVAL;
 		}
 		if (aac->cfg.sample_rate != 48000) {
 			pr_err("[%s:%s] only 48KHz is supported\n",
 					__MM_FILE__, __func__);
 			rc = -EINVAL;
 		}
 		if (aac->cfg.stream_format != AUDIO_AAC_FORMAT_RAW &&
 			aac->cfg.stream_format != AUDIO_AAC_FORMAT_ADTS) {
 			pr_err("[%s:%s] unsupported AAC format\n", __MM_FILE__,
 					__func__);
 			rc = -EINVAL;
 		}
 		break;
 	case AUDIO_GET_AAC_ENC_CONFIG:
 		if (copy_to_user((void *) arg, &aac->cfg,
 				 sizeof(struct msm_audio_aac_enc_config))) {
 			rc = -EFAULT;
 		}
 		pr_debug("[%s:%s] GET_AAC_ENC_CONFIG: channels=%d, rate=%d\n",
 			__MM_FILE__, __func__, aac->cfg.channels,
 			aac->cfg.sample_rate);
 		break;
 	default:
 		rc = -EINVAL;
 	}

 	mutex_unlock(&aac->lock);
 	pr_debug("[%s:%s] rc = %d\n", __MM_FILE__, __func__, rc);
 	return rc;
 }

 static int q6_aac_in_open(struct inode *inode, struct file *file)
 {

 	struct aac *aac;
 	struct aac_fc *fc;
 	int i;
 	pr_info("[%s:%s] open\n", __MM_FILE__, __func__);
 	aac = kmalloc(sizeof(struct aac), GFP_KERNEL);
 	if (aac == NULL) {
 		pr_err("[%s:%s] Could not allocate memory for aac driver\n",
 				__MM_FILE__, __func__);
 		return -ENOMEM;
 	}

 	mutex_init(&aac->lock);
 	file->private_data = aac;
 	aac->audio_client = NULL;
 	aac->str_cfg.buffer_size = 1543;
 	aac->str_cfg.buffer_count = 2;
 	aac->cfg.channels = 1;
 	aac->cfg.bit_rate = 192000;
 	aac->cfg.stream_format = AUDIO_AAC_FORMAT_ADTS;
 	aac->cfg.sample_rate = 48000;
 	aac->voicerec_mode.rec_mode = AUDIO_FLAG_READ;

 	aac->aac_fc = kmalloc(sizeof(struct aac_fc), GFP_KERNEL);
 	if (aac->aac_fc == NULL) {
 		pr_err("[%s:%s] Could not allocate memory for aac_fc\n",
 				__MM_FILE__, __func__);
 		kfree(aac);
 		return -ENOMEM;
 	}
 	fc = aac->aac_fc;
 	fc->task = NULL;
 	fc->buff_index = 0;
 	for (i = 0; i < AAC_FC_BUFF_CNT; ++i) {
 		fc->fc_buff[i].data = NULL;
 		fc->fc_buff[i].size = 0;
 		fc->fc_buff[i].actual_size = 0;
 	}
 	/*initialize wait queue head*/
 	init_waitqueue_head(&fc->fc_wq);
 	return 0;
 }

 static ssize_t q6_aac_in_read(struct file *file, char __user *buf,
 			  size_t count, loff_t *pos)
 {
 	struct audio_client *ac;
 	const char __user *start = buf;
 	struct aac *aac = file->private_data;
 	struct aac_fc *fc;
 	int xfer = 0;
 	int res = 0;

 	pr_debug("[%s:%s] count = %d\n", __MM_FILE__, __func__, count);
 	mutex_lock(&aac->lock);
 	ac = aac->audio_client;

 	if (!ac) {
 		res = -ENODEV;
 		goto fail;
 	}
 	fc = aac->aac_fc;

 	/*wait for buffer to full*/
 	if (fc->fc_buff[fc->buff_index].empty != 0) {
 		res = wait_event_interruptible_timeout(fc->fc_wq,
 			(fc->fc_buff[fc->buff_index].empty == 0),
 				msecs_to_jiffies(AAC_READ_TIMEOUT));

 		pr_debug("[%s:%s] buff_index = %d\n", __MM_FILE__,
 			__func__, fc->buff_index);
 		if (res == 0) {
 			pr_err("[%s:%s] Timeout!\n", __MM_FILE__, __func__);
 			res = -ETIMEDOUT;
 			goto fail;
 		} else if (res < 0) {
 			pr_err("[%s:%s] Returning on Interrupt\n", __MM_FILE__,
 				__func__);
 			goto fail;
 		}
 	}
 	/*lock the buffer*/
 	mutex_lock(&(fc->fc_buff[fc->buff_index].lock));
 	xfer = fc->fc_buff[fc->buff_index].actual_size;

 	if (xfer > count) {
 		mutex_unlock(&(fc->fc_buff[fc->buff_index].lock));
 		pr_err("[%s:%s] read failed! byte count too small\n",
 				__MM_FILE__, __func__);
 		res = -EINVAL;
 		goto fail;
 	}

 	if (copy_to_user(buf, fc->fc_buff[fc->buff_index].data,	xfer)) {
 		mutex_unlock(&(fc->fc_buff[fc->buff_index].lock));
 		pr_err("[%s:%s] copy_to_user failed at index %d\n",
 				__MM_FILE__, __func__, fc->buff_index);
 		res = -EFAULT;
 		goto fail;
 	}

 	buf += xfer;

 	fc->fc_buff[fc->buff_index].empty = 1;
 	fc->fc_buff[fc->buff_index].actual_size = 0;

 	mutex_unlock(&(fc->fc_buff[fc->buff_index].lock));
 	++(fc->buff_index);
 	if (fc->buff_index >= AAC_FC_BUFF_CNT)
 		fc->buff_index = 0;

 	res = buf - start;
 fail:
 	mutex_unlock(&aac->lock);

 	return res;
 }

 static int q6_aac_in_release(struct inode *inode, struct file *file)
 {
 	int rc = 0;
 	struct aac *aac = file->private_data;
 	int i = 0;
 	struct aac_fc *fc;

 	mutex_lock(&aac->lock);
 	fc = aac->aac_fc;
 	kthread_stop(fc->task);
 	fc->task = NULL;

 	/*free flow control buffers*/
 	for (i = 0; i < AAC_FC_BUFF_CNT; ++i) {
 		kfree(fc->fc_buff[i].data);
 		fc->fc_buff[i].data = NULL;
 	}
 	kfree(fc);
 	if (aac->audio_client)
 		rc = q6audio_close(aac->audio_client);
 	mutex_unlock(&aac->lock);
 	kfree(aac);
 	pr_info("[%s:%s] release\n", __MM_FILE__, __func__);
 	return rc;
 }

 static const struct file_operations q6_aac_in_fops = {
 	.owner		= THIS_MODULE,
 	.open		= q6_aac_in_open,
 	.read		= q6_aac_in_read,
 	.release	= q6_aac_in_release,
 	.unlocked_ioctl	= q6_aac_in_ioctl,
 };

 struct miscdevice q6_aac_in_misc = {
 	.minor	= MISC_DYNAMIC_MINOR,
 	.name	= "msm_aac_in",
 	.fops	= &q6_aac_in_fops,
 };

 static int __init q6_aac_in_init(void)
 {
 	return misc_register(&q6_aac_in_misc);
 }

 device_initcall(q6_aac_in_init);
	/*
	* Copyright (C) 2009 Google, Inc.
	* Copyright (C) 2009 HTC Corporation
	* Copyright (c) 2010, The Linux Foundation. All rights reserved.
	*
	* 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/slab.h>
	#include <linux/fs.h>
	#include <linux/module.h>
	#include <linux/miscdevice.h>
	#include <linux/mutex.h>
	#include <linux/sched.h>
	#include <linux/wait.h>
	#include <linux/uaccess.h>
	#include <linux/kthread.h>
	#include <linux/time.h>
	#include <linux/wait.h>

	#include <linux/msm_audio.h>
	#include <linux/msm_audio_aac.h>
	#include <mach/msm_qdsp6_audio.h>
	#include <mach/debug_mm.h>

	#define AAC_FC_BUFF_CNT 10
	#define AAC_READ_TIMEOUT 2000
	struct aac_fc_buff {
	struct mutex lock;
	int empty;
	void *data;
	int size;
	int actual_size;
	};

	struct aac_fc {
	struct task_struct *task;
	wait_queue_head_t fc_wq;
	struct aac_fc_buff fc_buff[AAC_FC_BUFF_CNT];
	int buff_index;
	};
	struct aac {
	struct mutex lock;
	struct msm_audio_aac_enc_config cfg;
	struct msm_audio_stream_config str_cfg;
	struct audio_client *audio_client;
	struct msm_voicerec_mode voicerec_mode;
	struct aac_fc *aac_fc;
	};

	static int q6_aac_flowcontrol(void *data)
	{
	struct audio_client *ac;
	struct audio_buffer *ab;
	struct aac *aac = data;
	int buff_index = 0;
	int xfer = 0;
	struct aac_fc *fc;


	ac = aac->audio_client;
	fc = aac->aac_fc;
	if (!ac) {
	pr_err("[%s:%s] audio_client is NULL\n", __MM_FILE__, __func__);
	return 0;
	}

	while (!kthread_should_stop()) {
	ab = ac->buf + ac->cpu_buf;
	if (ab->used)
	wait_event(ac->wait, (ab->used == 0));
	pr_debug("[%s:%s] ab->data = %p, cpu_buf = %d\n", __MM_FILE__,
	__func__, ab->data, ac->cpu_buf);
	xfer = ab->actual_size;

	mutex_lock(&(fc->fc_buff[buff_index].lock));
	if (!fc->fc_buff[buff_index].empty) {
	pr_err("[%s:%s] flow control buffer[%d] not read!\n",
	__MM_FILE__, __func__, buff_index);
	}

	if (fc->fc_buff[buff_index].size < xfer) {
	pr_err("[%s:%s] buffer %d too small\n", __MM_FILE__,
	__func__, buff_index);
	memcpy(fc->fc_buff[buff_index].data,
	ab->data, fc->fc_buff[buff_index].size);
	fc->fc_buff[buff_index].empty = 0;
	fc->fc_buff[buff_index].actual_size =
	fc->fc_buff[buff_index].size;
	} else {
	memcpy(fc->fc_buff[buff_index].data, ab->data, xfer);
	fc->fc_buff[buff_index].empty = 0;
	fc->fc_buff[buff_index].actual_size = xfer;
	}
	mutex_unlock(&(fc->fc_buff[buff_index].lock));
	/wake up client, if any/
	wake_up(&fc->fc_wq);

	buff_index++;
	if (buff_index >= AAC_FC_BUFF_CNT)
	buff_index = 0;

	ab->used = 1;

	q6audio_read(ac, ab);
	ac->cpu_buf ^= 1;
	}

	return 0;
	}
	static long q6_aac_in_ioctl(struct file *file,
	unsigned int cmd, unsigned long arg)
	{
	struct aac *aac = file->private_data;
	int rc = 0;
	int i = 0;
	struct aac_fc *fc;
	int size = 0;

	mutex_lock(&aac->lock);
	switch (cmd) {
	case AUDIO_SET_VOLUME:
	break;
	case AUDIO_GET_STATS:
	{
	struct msm_audio_stats stats;
	pr_debug("[%s:%s] GET_STATS\n", __MM_FILE__, __func__);
	memset(&stats, 0, sizeof(stats));
	if (copy_to_user((void *) arg, &stats, sizeof(stats)))
	return -EFAULT;
	return 0;
	}
	case AUDIO_START:
	{
	uint32_t acdb_id;
	pr_debug("[%s:%s] AUDIO_START\n", __MM_FILE__, __func__);
	if (arg == 0) {
	acdb_id = 0;
	} else {
	if (copy_from_user(&acdb_id, (void *) arg,
	sizeof(acdb_id))) {
	rc = -EFAULT;
	break;
	}
	}
	if (aac->audio_client) {
	rc = -EBUSY;
	pr_err("[%s:%s] active session already existing\n",
	__MM_FILE__, __func__);
	break;
	} else {
	aac->audio_client = q6audio_open_aac(
	aac->str_cfg.buffer_size,
	aac->cfg.sample_rate,
	aac->cfg.channels,
	aac->cfg.bit_rate,
	aac->cfg.stream_format,
	aac->voicerec_mode.rec_mode, acdb_id);

	if (aac->audio_client < 0) {
	pr_err("[%s:%s] aac open session failed\n",
	__MM_FILE__, __func__);
	rc = -ENOMEM;
	break;
	}
	}

	/allocate flow control buffers/
	fc = aac->aac_fc;
	size = ((aac->str_cfg.buffer_size < 1543) ? 1543 :
	aac->str_cfg.buffer_size);
	for (i = 0; i < AAC_FC_BUFF_CNT; ++i) {
	mutex_init(&(fc->fc_buff[i].lock));
	fc->fc_buff[i].empty = 1;
	fc->fc_buff[i].data = kmalloc(size, GFP_KERNEL);
	if (fc->fc_buff[i].data == NULL) {
	pr_err("[%s:%s] No memory for FC buffers\n",
	__MM_FILE__, __func__);
	rc = -ENOMEM;
	goto fc_fail;
	}
	fc->fc_buff[i].size = size;
	fc->fc_buff[i].actual_size = 0;
	}

	/create flow control thread/
	fc->task = kthread_run(q6_aac_flowcontrol,
	aac, "aac_flowcontrol");
	if (IS_ERR(fc->task)) {
	rc = PTR_ERR(fc->task);
	pr_err("[%s:%s] error creating flow control thread\n",
	__MM_FILE__, __func__);
	goto fc_fail;
	}
	break;
	fc_fail:
	/free flow control buffers/
	--i;
	for (; i >= 0; i--) {
	kfree(fc->fc_buff[i].data);
	fc->fc_buff[i].data = NULL;
	}
	break;
	}
	case AUDIO_STOP:
	pr_debug("[%s:%s] AUDIO_STOP\n", __MM_FILE__, __func__);
	break;
	case AUDIO_FLUSH:
	break;
	case AUDIO_SET_INCALL: {
	pr_debug("[%s:%s] SET_INCALL\n", __MM_FILE__, __func__);
	if (copy_from_user(&aac->voicerec_mode,
	(void *)arg, sizeof(struct msm_voicerec_mode)))
	rc = -EFAULT;

	if (aac->voicerec_mode.rec_mode != AUDIO_FLAG_READ
	&& aac->voicerec_mode.rec_mode !=
	AUDIO_FLAG_INCALL_MIXED) {
	aac->voicerec_mode.rec_mode = AUDIO_FLAG_READ;
	pr_err("[%s:%s] Invalid rec_mode\n", __MM_FILE__,
	__func__);
	rc = -EINVAL;
	}
	break;
	}
	case AUDIO_GET_STREAM_CONFIG:
	if (copy_to_user((void *)arg, &aac->str_cfg,
	sizeof(struct msm_audio_stream_config)))
	rc = -EFAULT;
	pr_debug("[%s:%s] GET_STREAM_CONFIG: buffsz=%d, buffcnt=%d\n",
	__MM_FILE__, __func__, aac->str_cfg.buffer_size,
	aac->str_cfg.buffer_count);
	break;
	case AUDIO_SET_STREAM_CONFIG:
	if (copy_from_user(&aac->str_cfg, (void *)arg,
	sizeof(struct msm_audio_stream_config))) {
	rc = -EFAULT;
	break;
	}
	pr_debug("[%s:%s] SET_STREAM_CONFIG: buffsz=%d, buffcnt=%d\n",
	__MM_FILE__, __func__, aac->str_cfg.buffer_size,
	aac->str_cfg.buffer_count);
	if (aac->str_cfg.buffer_size < 1543) {
	pr_err("[%s:%s] Buffer size too small\n", __MM_FILE__,
	__func__);
	rc = -EINVAL;
	break;
	}
	if (aac->str_cfg.buffer_count != 2)
	pr_info("[%s:%s] Buffer count set to 2\n", __MM_FILE__,
	__func__);

	break;
	case AUDIO_SET_AAC_ENC_CONFIG:
	if (copy_from_user(&aac->cfg, (void *) arg,
	sizeof(struct msm_audio_aac_enc_config))) {
	rc = -EFAULT;
	}
	pr_debug("[%s:%s] SET_AAC_ENC_CONFIG: channels=%d, rate=%d\n",
	__MM_FILE__, __func__, aac->cfg.channels,
	aac->cfg.sample_rate);
	if (aac->cfg.channels < 1 \|\| aac->cfg.channels > 2) {
	pr_err("[%s:%s]invalid number of channels\n",
	__MM_FILE__, __func__);
	rc = -EINVAL;
	}
	if (aac->cfg.sample_rate != 48000) {
	pr_err("[%s:%s] only 48KHz is supported\n",
	__MM_FILE__, __func__);
	rc = -EINVAL;
	}
	if (aac->cfg.stream_format != AUDIO_AAC_FORMAT_RAW &&
	aac->cfg.stream_format != AUDIO_AAC_FORMAT_ADTS) {
	pr_err("[%s:%s] unsupported AAC format\n", __MM_FILE__,
	__func__);
	rc = -EINVAL;
	}
	break;
	case AUDIO_GET_AAC_ENC_CONFIG:
	if (copy_to_user((void *) arg, &aac->cfg,
	sizeof(struct msm_audio_aac_enc_config))) {
	rc = -EFAULT;
	}
	pr_debug("[%s:%s] GET_AAC_ENC_CONFIG: channels=%d, rate=%d\n",
	__MM_FILE__, __func__, aac->cfg.channels,
	aac->cfg.sample_rate);
	break;
	default:
	rc = -EINVAL;
	}

	mutex_unlock(&aac->lock);
	pr_debug("[%s:%s] rc = %d\n", __MM_FILE__, __func__, rc);
	return rc;
	}

	static int q6_aac_in_open(struct inode inode, struct file file)
	{

	struct aac *aac;
	struct aac_fc *fc;
	int i;
	pr_info("[%s:%s] open\n", __MM_FILE__, __func__);
	aac = kmalloc(sizeof(struct aac), GFP_KERNEL);
	if (aac == NULL) {
	pr_err("[%s:%s] Could not allocate memory for aac driver\n",
	__MM_FILE__, __func__);
	return -ENOMEM;
	}

	mutex_init(&aac->lock);
	file->private_data = aac;
	aac->audio_client = NULL;
	aac->str_cfg.buffer_size = 1543;
	aac->str_cfg.buffer_count = 2;
	aac->cfg.channels = 1;
	aac->cfg.bit_rate = 192000;
	aac->cfg.stream_format = AUDIO_AAC_FORMAT_ADTS;
	aac->cfg.sample_rate = 48000;
	aac->voicerec_mode.rec_mode = AUDIO_FLAG_READ;

	aac->aac_fc = kmalloc(sizeof(struct aac_fc), GFP_KERNEL);
	if (aac->aac_fc == NULL) {
	pr_err("[%s:%s] Could not allocate memory for aac_fc\n",
	__MM_FILE__, __func__);
	kfree(aac);
	return -ENOMEM;
	}
	fc = aac->aac_fc;
	fc->task = NULL;
	fc->buff_index = 0;
	for (i = 0; i < AAC_FC_BUFF_CNT; ++i) {
	fc->fc_buff[i].data = NULL;
	fc->fc_buff[i].size = 0;
	fc->fc_buff[i].actual_size = 0;
	}
	/initialize wait queue head/
	init_waitqueue_head(&fc->fc_wq);
	return 0;
	}

	static ssize_t q6_aac_in_read(struct file file, char __user buf,
	size_t count, loff_t *pos)
	{
	struct audio_client *ac;
	const char __user *start = buf;
	struct aac *aac = file->private_data;
	struct aac_fc *fc;
	int xfer = 0;
	int res = 0;

	pr_debug("[%s:%s] count = %d\n", __MM_FILE__, __func__, count);
	mutex_lock(&aac->lock);
	ac = aac->audio_client;

	if (!ac) {
	res = -ENODEV;
	goto fail;
	}
	fc = aac->aac_fc;

	/wait for buffer to full/
	if (fc->fc_buff[fc->buff_index].empty != 0) {
	res = wait_event_interruptible_timeout(fc->fc_wq,
	(fc->fc_buff[fc->buff_index].empty == 0),
	msecs_to_jiffies(AAC_READ_TIMEOUT));

	pr_debug("[%s:%s] buff_index = %d\n", __MM_FILE__,
	__func__, fc->buff_index);
	if (res == 0) {
	pr_err("[%s:%s] Timeout!\n", __MM_FILE__, __func__);
	res = -ETIMEDOUT;
	goto fail;
	} else if (res < 0) {
	pr_err("[%s:%s] Returning on Interrupt\n", __MM_FILE__,
	__func__);
	goto fail;
	}
	}
	/lock the buffer/
	mutex_lock(&(fc->fc_buff[fc->buff_index].lock));
	xfer = fc->fc_buff[fc->buff_index].actual_size;

	if (xfer > count) {
	mutex_unlock(&(fc->fc_buff[fc->buff_index].lock));
	pr_err("[%s:%s] read failed! byte count too small\n",
	__MM_FILE__, __func__);
	res = -EINVAL;
	goto fail;
	}

	if (copy_to_user(buf, fc->fc_buff[fc->buff_index].data, xfer)) {
	mutex_unlock(&(fc->fc_buff[fc->buff_index].lock));
	pr_err("[%s:%s] copy_to_user failed at index %d\n",
	__MM_FILE__, __func__, fc->buff_index);
	res = -EFAULT;
	goto fail;
	}

	buf += xfer;

	fc->fc_buff[fc->buff_index].empty = 1;
	fc->fc_buff[fc->buff_index].actual_size = 0;

	mutex_unlock(&(fc->fc_buff[fc->buff_index].lock));
	++(fc->buff_index);
	if (fc->buff_index >= AAC_FC_BUFF_CNT)
	fc->buff_index = 0;

	res = buf - start;
	fail:
	mutex_unlock(&aac->lock);

	return res;
	}

	static int q6_aac_in_release(struct inode inode, struct file file)
	{
	int rc = 0;
	struct aac *aac = file->private_data;
	int i = 0;
	struct aac_fc *fc;

	mutex_lock(&aac->lock);
	fc = aac->aac_fc;
	kthread_stop(fc->task);
	fc->task = NULL;

	/free flow control buffers/
	for (i = 0; i < AAC_FC_BUFF_CNT; ++i) {
	kfree(fc->fc_buff[i].data);
	fc->fc_buff[i].data = NULL;
	}
	kfree(fc);
	if (aac->audio_client)
	rc = q6audio_close(aac->audio_client);
	mutex_unlock(&aac->lock);
	kfree(aac);
	pr_info("[%s:%s] release\n", __MM_FILE__, __func__);
	return rc;
	}

	static const struct file_operations q6_aac_in_fops = {
	.owner = THIS_MODULE,
	.open = q6_aac_in_open,
	.read = q6_aac_in_read,
	.release = q6_aac_in_release,
	.unlocked_ioctl = q6_aac_in_ioctl,
	};

	struct miscdevice q6_aac_in_misc = {
	.minor = MISC_DYNAMIC_MINOR,
	.name = "msm_aac_in",
	.fops = &q6_aac_in_fops,
	};

	static int __init q6_aac_in_init(void)
	{
	return misc_register(&q6_aac_in_misc);
	}

	device_initcall(q6_aac_in_init);