sound/soc/msm/msm-pcm-q6.c - fp2-dev/kernel/msm - Gitiles

 /* Copyright (c) 2011-2012, Code Aurora Forum. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
  * only version 2 as published by the Free Software Foundation.
  *
  * 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/init.h>
 #include <linux/err.h>
 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/time.h>
 #include <linux/wait.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <sound/core.h>
 #include <sound/soc.h>
 #include <sound/soc-dapm.h>
 #include <sound/pcm.h>
 #include <sound/initval.h>
 #include <sound/control.h>
 #include <asm/dma.h>
 #include <linux/dma-mapping.h>
 #include <linux/android_pmem.h>

 #include "msm-pcm-q6.h"
 #include "msm-pcm-routing.h"

 static struct audio_locks the_locks;

 struct snd_msm {
 	struct snd_card *card;
 	struct snd_pcm *pcm;
 };

 #define PLAYBACK_NUM_PERIODS	8
 #define PLAYBACK_PERIOD_SIZE	2048
 #define CAPTURE_NUM_PERIODS	16
 #define CAPTURE_PERIOD_SIZE	320

 static struct snd_pcm_hardware msm_pcm_hardware_capture = {
 	.info =                 (SNDRV_PCM_INFO_MMAP |
 				SNDRV_PCM_INFO_BLOCK_TRANSFER |
 				SNDRV_PCM_INFO_MMAP_VALID |
 				SNDRV_PCM_INFO_INTERLEAVED |
 				SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME),
 	.formats =              SNDRV_PCM_FMTBIT_S16_LE,
 	.rates =                SNDRV_PCM_RATE_8000_48000,
 	.rate_min =             8000,
 	.rate_max =             48000,
 	.channels_min =         1,
 	.channels_max =         4,
 	.buffer_bytes_max =     CAPTURE_NUM_PERIODS * CAPTURE_PERIOD_SIZE,
 	.period_bytes_min =	CAPTURE_PERIOD_SIZE,
 	.period_bytes_max =     CAPTURE_PERIOD_SIZE,
 	.periods_min =          CAPTURE_NUM_PERIODS,
 	.periods_max =          CAPTURE_NUM_PERIODS,
 	.fifo_size =            0,
 };

 static struct snd_pcm_hardware msm_pcm_hardware_playback = {
 	.info =                 (SNDRV_PCM_INFO_MMAP |
 				SNDRV_PCM_INFO_BLOCK_TRANSFER |
 				SNDRV_PCM_INFO_MMAP_VALID |
 				SNDRV_PCM_INFO_INTERLEAVED |
 				SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME),
 	.formats =              SNDRV_PCM_FMTBIT_S16_LE,
 	.rates =                SNDRV_PCM_RATE_8000_48000 | SNDRV_PCM_RATE_KNOT,
 	.rate_min =             8000,
 	.rate_max =             48000,
 	.channels_min =         1,
 	.channels_max =         2,
 	.buffer_bytes_max =     PLAYBACK_NUM_PERIODS * PLAYBACK_PERIOD_SIZE,
 	.period_bytes_min =	PLAYBACK_PERIOD_SIZE,
 	.period_bytes_max =     PLAYBACK_PERIOD_SIZE,
 	.periods_min =          PLAYBACK_NUM_PERIODS,
 	.periods_max =          PLAYBACK_NUM_PERIODS,
 	.fifo_size =            0,
 };

 /* Conventional and unconventional sample rate supported */
 static unsigned int supported_sample_rates[] = {
 	8000, 11025, 12000, 16000, 22050, 24000, 32000, 44100, 48000
 };

 static uint32_t in_frame_info[CAPTURE_NUM_PERIODS][2];

 static struct snd_pcm_hw_constraint_list constraints_sample_rates = {
 	.count = ARRAY_SIZE(supported_sample_rates),
 	.list = supported_sample_rates,
 	.mask = 0,
 };

 static void event_handler(uint32_t opcode,
 		uint32_t token, uint32_t *payload, void *priv)
 {
 	struct msm_audio *prtd = priv;
 	struct snd_pcm_substream *substream = prtd->substream;
 	uint32_t *ptrmem = (uint32_t *)payload;
 	int i = 0;
 	uint32_t idx = 0;
 	uint32_t size = 0;

 	pr_debug("%s\n", __func__);
 	switch (opcode) {
 	case ASM_DATA_EVENT_WRITE_DONE: {
 		pr_debug("ASM_DATA_EVENT_WRITE_DONE\n");
 		pr_debug("Buffer Consumed = 0x%08x\n", *ptrmem);
 		prtd->pcm_irq_pos += prtd->pcm_count;
 		if (atomic_read(&prtd->start))
 			snd_pcm_period_elapsed(substream);
 		atomic_inc(&prtd->out_count);
 		wake_up(&the_locks.write_wait);
 		if (!atomic_read(&prtd->start))
 			break;
 		if (!prtd->mmap_flag)
 			break;
 		if (q6asm_is_cpu_buf_avail_nolock(IN,
 				prtd->audio_client,
 				&size, &idx)) {
 			pr_debug("%s:writing %d bytes of buffer to dsp 2\n",
 					__func__, prtd->pcm_count);
 			q6asm_write_nolock(prtd->audio_client,
 				prtd->pcm_count, 0, 0, NO_TIMESTAMP);
 		}
 		break;
 	}
 	case ASM_DATA_CMDRSP_EOS:
 		pr_debug("ASM_DATA_CMDRSP_EOS\n");
 		prtd->cmd_ack = 1;
 		wake_up(&the_locks.eos_wait);
 		break;
 	case ASM_DATA_EVENT_READ_DONE: {
 		pr_debug("ASM_DATA_EVENT_READ_DONE\n");
 		pr_debug("token = 0x%08x\n", token);
 		for (i = 0; i < 8; i++, ++ptrmem)
 			pr_debug("cmd[%d]=0x%08x\n", i, *ptrmem);
 		in_frame_info[token][0] = payload[2];
 		in_frame_info[token][1] = payload[3];
 		prtd->pcm_irq_pos += in_frame_info[token][0];
 		pr_debug("pcm_irq_pos=%d\n", prtd->pcm_irq_pos);
 		if (atomic_read(&prtd->start))
 			snd_pcm_period_elapsed(substream);
 		if (atomic_read(&prtd->in_count) <= prtd->periods)
 			atomic_inc(&prtd->in_count);
 		wake_up(&the_locks.read_wait);
 		if (prtd->mmap_flag
 			&& q6asm_is_cpu_buf_avail_nolock(OUT,
 				prtd->audio_client,
 				&size, &idx))
 			q6asm_read_nolock(prtd->audio_client);
 		break;
 	}
 	case APR_BASIC_RSP_RESULT: {
 		switch (payload[0]) {
 		case ASM_SESSION_CMD_RUN:
 			if (substream->stream
 				!= SNDRV_PCM_STREAM_PLAYBACK) {
 				atomic_set(&prtd->start, 1);
 				break;
 			}
 			if (prtd->mmap_flag) {
 				pr_debug("%s:writing %d bytes"
 					" of buffer to dsp\n",
 					__func__,
 					prtd->pcm_count);
 				q6asm_write_nolock(prtd->audio_client,
 					prtd->pcm_count,
 					0, 0, NO_TIMESTAMP);
 			} else {
 				while (atomic_read(&prtd->out_needed)) {
 					pr_debug("%s:writing %d bytes"
 						 " of buffer to dsp\n",
 						__func__,
 						prtd->pcm_count);
 					q6asm_write_nolock(prtd->audio_client,
 						prtd->pcm_count,
 						0, 0, NO_TIMESTAMP);
 					atomic_dec(&prtd->out_needed);
 					wake_up(&the_locks.write_wait);
 				};
 			}
 			atomic_set(&prtd->start, 1);
 			break;
 		default:
 			break;
 		}
 	}
 	break;
 	default:
 		pr_debug("Not Supported Event opcode[0x%x]\n", opcode);
 		break;
 	}
 }

 static int msm_pcm_playback_prepare(struct snd_pcm_substream *substream)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct msm_audio *prtd = runtime->private_data;
 	int ret;

 	pr_debug("%s\n", __func__);
 	prtd->pcm_size = snd_pcm_lib_buffer_bytes(substream);
 	prtd->pcm_count = snd_pcm_lib_period_bytes(substream);
 	prtd->pcm_irq_pos = 0;
 	/* rate and channels are sent to audio driver */
 	prtd->samp_rate = runtime->rate;
 	prtd->channel_mode = runtime->channels;
 	if (prtd->enabled)
 		return 0;

 	ret = q6asm_media_format_block_pcm(prtd->audio_client, runtime->rate,
 				runtime->channels);
 	if (ret < 0)
 		pr_info("%s: CMD Format block failed\n", __func__);

 	atomic_set(&prtd->out_count, runtime->periods);

 	prtd->enabled = 1;
 	prtd->cmd_ack = 0;

 	return 0;
 }

 static int msm_pcm_capture_prepare(struct snd_pcm_substream *substream)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct msm_audio *prtd = runtime->private_data;
 	int ret = 0;
 	int i = 0;
 	pr_debug("%s\n", __func__);
 	prtd->pcm_size = snd_pcm_lib_buffer_bytes(substream);
 	prtd->pcm_count = snd_pcm_lib_period_bytes(substream);
 	prtd->pcm_irq_pos = 0;

 	/* rate and channels are sent to audio driver */
 	prtd->samp_rate = runtime->rate;
 	prtd->channel_mode = runtime->channels;

 	if (prtd->enabled)
 		return 0;

 	pr_debug("Samp_rate = %d\n", prtd->samp_rate);
 	pr_debug("Channel = %d\n", prtd->channel_mode);
 	if (prtd->channel_mode > 2) {
 		ret = q6asm_enc_cfg_blk_multi_ch_pcm(prtd->audio_client,
 		prtd->samp_rate, prtd->channel_mode);
 	} else {
 		ret = q6asm_enc_cfg_blk_pcm(prtd->audio_client,
 		prtd->samp_rate, prtd->channel_mode);
 	}

 	if (ret < 0)
 		pr_debug("%s: cmd cfg pcm was block failed", __func__);

 	for (i = 0; i < runtime->periods; i++)
 		q6asm_read(prtd->audio_client);
 	prtd->periods = runtime->periods;

 	prtd->enabled = 1;

 	return ret;
 }

 static int msm_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
 {
 	int ret = 0;
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct msm_audio *prtd = runtime->private_data;

 	switch (cmd) {
 	case SNDRV_PCM_TRIGGER_START:
 	case SNDRV_PCM_TRIGGER_RESUME:
 	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
 		pr_debug("%s: Trigger start\n", __func__);
 		q6asm_run_nowait(prtd->audio_client, 0, 0, 0);
 		break;
 	case SNDRV_PCM_TRIGGER_STOP:
 		pr_debug("SNDRV_PCM_TRIGGER_STOP\n");
 		atomic_set(&prtd->start, 0);
 		if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
 			break;
 		prtd->cmd_ack = 0;
 		q6asm_cmd_nowait(prtd->audio_client, CMD_EOS);
 		break;
 	case SNDRV_PCM_TRIGGER_SUSPEND:
 	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
 		pr_debug("SNDRV_PCM_TRIGGER_PAUSE\n");
 		q6asm_cmd_nowait(prtd->audio_client, CMD_PAUSE);
 		atomic_set(&prtd->start, 0);
 		break;
 	default:
 		ret = -EINVAL;
 		break;
 	}

 	return ret;
 }

 static int msm_pcm_open(struct snd_pcm_substream *substream)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct snd_soc_pcm_runtime *soc_prtd = substream->private_data;
 	struct msm_audio *prtd;
 	int ret = 0;

 	pr_debug("%s\n", __func__);
 	prtd = kzalloc(sizeof(struct msm_audio), GFP_KERNEL);
 	if (prtd == NULL) {
 		pr_err("Failed to allocate memory for msm_audio\n");
 		return -ENOMEM;
 	}
 	prtd->substream = substream;
 	prtd->audio_client = q6asm_audio_client_alloc(
 				(app_cb)event_handler, prtd);
 	if (!prtd->audio_client) {
 		pr_info("%s: Could not allocate memory\n", __func__);
 		kfree(prtd);
 		return -ENOMEM;
 	}
 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
 		runtime->hw = msm_pcm_hardware_playback;
 		ret = q6asm_open_write(prtd->audio_client, FORMAT_LINEAR_PCM);
 		if (ret < 0) {
 			pr_err("%s: pcm out open failed\n", __func__);
 			q6asm_audio_client_free(prtd->audio_client);
 			kfree(prtd);
 			return -ENOMEM;
 		}

 		pr_debug("%s: session ID %d\n", __func__,
 			prtd->audio_client->session);
 		prtd->session_id = prtd->audio_client->session;
 		msm_pcm_routing_reg_phy_stream(soc_prtd->dai_link->be_id,
 			prtd->session_id, substream->stream);
 		prtd->cmd_ack = 1;

 	}
 	/* Capture path */
 	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
 		runtime->hw = msm_pcm_hardware_capture;
 	}

 	ret = snd_pcm_hw_constraint_list(runtime, 0,
 				SNDRV_PCM_HW_PARAM_RATE,
 				&constraints_sample_rates);
 	if (ret < 0)
 		pr_info("snd_pcm_hw_constraint_list failed\n");
 	/* Ensure that buffer size is a multiple of period size */
 	ret = snd_pcm_hw_constraint_integer(runtime,
 					    SNDRV_PCM_HW_PARAM_PERIODS);
 	if (ret < 0)
 		pr_info("snd_pcm_hw_constraint_integer failed\n");

 	prtd->dsp_cnt = 0;
 	runtime->private_data = prtd;

 	return 0;
 }

 static int msm_pcm_playback_copy(struct snd_pcm_substream *substream, int a,
 	snd_pcm_uframes_t hwoff, void __user *buf, snd_pcm_uframes_t frames)
 {
 	int ret = 0;
 	int fbytes = 0;
 	int xfer = 0;
 	char *bufptr = NULL;
 	void *data = NULL;
 	uint32_t idx = 0;
 	uint32_t size = 0;

 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct msm_audio *prtd = runtime->private_data;

 	fbytes = frames_to_bytes(runtime, frames);
 	pr_debug("%s: prtd->out_count = %d\n",
 				__func__, atomic_read(&prtd->out_count));
 	ret = wait_event_timeout(the_locks.write_wait,
 			(atomic_read(&prtd->out_count)), 5 * HZ);
 	if (ret < 0) {
 		pr_err("%s: wait_event_timeout failed\n", __func__);
 		goto fail;
 	}

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

 	data = q6asm_is_cpu_buf_avail(IN, prtd->audio_client, &size, &idx);
 	bufptr = data;
 	if (bufptr) {
 		pr_debug("%s:fbytes =%d: xfer=%d size=%d\n",
 					__func__, fbytes, xfer, size);
 		xfer = fbytes;
 		if (copy_from_user(bufptr, buf, xfer)) {
 			ret = -EFAULT;
 			goto fail;
 		}
 		buf += xfer;
 		fbytes -= xfer;
 		pr_debug("%s:fbytes = %d: xfer=%d\n", __func__, fbytes, xfer);
 		if (atomic_read(&prtd->start)) {
 			pr_debug("%s:writing %d bytes of buffer to dsp\n",
 					__func__, xfer);
 			ret = q6asm_write(prtd->audio_client, xfer,
 						0, 0, NO_TIMESTAMP);
 			if (ret < 0) {
 				ret = -EFAULT;
 				goto fail;
 			}
 		} else
 			atomic_inc(&prtd->out_needed);
 		atomic_dec(&prtd->out_count);
 	}
 fail:
 	return  ret;
 }

 static int msm_pcm_playback_close(struct snd_pcm_substream *substream)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct snd_soc_pcm_runtime *soc_prtd = substream->private_data;
 	struct msm_audio *prtd = runtime->private_data;
 	int dir = 0;
 	int ret = 0;

 	pr_debug("%s\n", __func__);

 	dir = IN;
 	ret = wait_event_timeout(the_locks.eos_wait,
 				prtd->cmd_ack, 5 * HZ);
 	if (ret < 0)
 		pr_err("%s: CMD_EOS failed\n", __func__);
 	q6asm_cmd(prtd->audio_client, CMD_CLOSE);
 	q6asm_audio_client_buf_free_contiguous(dir,
 				prtd->audio_client);

 	msm_pcm_routing_dereg_phy_stream(soc_prtd->dai_link->be_id,
 	SNDRV_PCM_STREAM_PLAYBACK);
 	q6asm_audio_client_free(prtd->audio_client);
 	kfree(prtd);
 	return 0;
 }

 static int msm_pcm_capture_copy(struct snd_pcm_substream *substream,
 		 int channel, snd_pcm_uframes_t hwoff, void __user *buf,
 						 snd_pcm_uframes_t frames)
 {
 	int ret = 0;
 	int fbytes = 0;
 	int xfer;
 	char *bufptr;
 	void *data = NULL;
 	static uint32_t idx;
 	static uint32_t size;
 	uint32_t offset = 0;
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct msm_audio *prtd = substream->runtime->private_data;


 	pr_debug("%s\n", __func__);
 	fbytes = frames_to_bytes(runtime, frames);

 	pr_debug("appl_ptr %d\n", (int)runtime->control->appl_ptr);
 	pr_debug("hw_ptr %d\n", (int)runtime->status->hw_ptr);
 	pr_debug("avail_min %d\n", (int)runtime->control->avail_min);

 	ret = wait_event_timeout(the_locks.read_wait,
 			(atomic_read(&prtd->in_count)), 5 * HZ);
 	if (ret < 0) {
 		pr_debug("%s: wait_event_timeout failed\n", __func__);
 		goto fail;
 	}
 	if (!atomic_read(&prtd->in_count)) {
 		pr_debug("%s: pcm stopped in_count 0\n", __func__);
 		return 0;
 	}
 	pr_debug("Checking if valid buffer is available...%08x\n",
 						(unsigned int) data);
 	data = q6asm_is_cpu_buf_avail(OUT, prtd->audio_client, &size, &idx);
 	bufptr = data;
 	pr_debug("Size = %d\n", size);
 	pr_debug("fbytes = %d\n", fbytes);
 	pr_debug("idx = %d\n", idx);
 	if (bufptr) {
 		xfer = fbytes;
 		if (xfer > size)
 			xfer = size;
 		offset = in_frame_info[idx][1];
 		pr_debug("Offset value = %d\n", offset);
 		if (copy_to_user(buf, bufptr+offset, xfer)) {
 			pr_err("Failed to copy buf to user\n");
 			ret = -EFAULT;
 			goto fail;
 		}
 		fbytes -= xfer;
 		size -= xfer;
 		in_frame_info[idx][1] += xfer;
 		pr_debug("%s:fbytes = %d: size=%d: xfer=%d\n",
 					__func__, fbytes, size, xfer);
 		pr_debug(" Sending next buffer to dsp\n");
 		memset(&in_frame_info[idx], 0,
 			sizeof(uint32_t) * 2);
 		atomic_dec(&prtd->in_count);
 		ret = q6asm_read(prtd->audio_client);
 		if (ret < 0) {
 			pr_err("q6asm read failed\n");
 			ret = -EFAULT;
 			goto fail;
 		}
 	} else
 		pr_err("No valid buffer\n");

 	pr_debug("Returning from capture_copy... %d\n", ret);
 fail:
 	return ret;
 }

 static int msm_pcm_capture_close(struct snd_pcm_substream *substream)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct snd_soc_pcm_runtime *soc_prtd = substream->private_data;
 	struct msm_audio *prtd = runtime->private_data;
 	int dir = OUT;

 	pr_debug("%s\n", __func__);
 	if (prtd->audio_client) {
 		q6asm_cmd(prtd->audio_client, CMD_CLOSE);
 		q6asm_audio_client_buf_free_contiguous(dir,
 				prtd->audio_client);
 		q6asm_audio_client_free(prtd->audio_client);
 	}

 	msm_pcm_routing_dereg_phy_stream(soc_prtd->dai_link->be_id,
 		SNDRV_PCM_STREAM_CAPTURE);
 	kfree(prtd);

 	return 0;
 }

 static int msm_pcm_copy(struct snd_pcm_substream *substream, int a,
 	 snd_pcm_uframes_t hwoff, void __user *buf, snd_pcm_uframes_t frames)
 {
 	int ret = 0;

 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 		ret = msm_pcm_playback_copy(substream, a, hwoff, buf, frames);
 	else if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
 		ret = msm_pcm_capture_copy(substream, a, hwoff, buf, frames);
 	return ret;
 }

 static int msm_pcm_close(struct snd_pcm_substream *substream)
 {
 	int ret = 0;

 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 		ret = msm_pcm_playback_close(substream);
 	else if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
 		ret = msm_pcm_capture_close(substream);
 	return ret;
 }
 static int msm_pcm_prepare(struct snd_pcm_substream *substream)
 {
 	int ret = 0;

 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 		ret = msm_pcm_playback_prepare(substream);
 	else if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
 		ret = msm_pcm_capture_prepare(substream);
 	return ret;
 }

 static snd_pcm_uframes_t msm_pcm_pointer(struct snd_pcm_substream *substream)
 {

 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct msm_audio *prtd = runtime->private_data;

 	if (prtd->pcm_irq_pos >= prtd->pcm_size)
 		prtd->pcm_irq_pos = 0;

 	pr_debug("pcm_irq_pos = %d\n", prtd->pcm_irq_pos);
 	return bytes_to_frames(runtime, (prtd->pcm_irq_pos));
 }

 static int msm_pcm_mmap(struct snd_pcm_substream *substream,
 				struct vm_area_struct *vma)
 {
 	int result = 0;
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct msm_audio *prtd = runtime->private_data;

 	pr_debug("%s\n", __func__);
 	prtd->mmap_flag = 1;

 	if (runtime->dma_addr && runtime->dma_bytes) {
 		vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
 		result = remap_pfn_range(vma, vma->vm_start,
 				runtime->dma_addr >> PAGE_SHIFT,
 				runtime->dma_bytes,
 				vma->vm_page_prot);
 	} else {
 		pr_err("Physical address or size of buf is NULL");
 		return -EINVAL;
 	}

 	return result;
 }

 static int msm_pcm_hw_params(struct snd_pcm_substream *substream,
 				struct snd_pcm_hw_params *params)
 {
 	struct snd_pcm_runtime *runtime = substream->runtime;
 	struct msm_audio *prtd = runtime->private_data;
 	struct snd_dma_buffer *dma_buf = &substream->dma_buffer;
 	struct snd_soc_pcm_runtime *soc_prtd = substream->private_data;
 	struct audio_buffer *buf;
 	int dir, ret;
 	int format = FORMAT_LINEAR_PCM;

 	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 		dir = IN;
 	else
 		dir = OUT;

 	/*capture path*/
 	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
 		if (params_channels(params) > 2)
 			format = FORMAT_MULTI_CHANNEL_LINEAR_PCM;
 		pr_debug("%s format = :0x%x\n", __func__, format);

 		ret = q6asm_open_read(prtd->audio_client, format);
 		if (ret < 0) {
 			pr_err("%s: q6asm_open_read failed\n", __func__);
 			q6asm_audio_client_free(prtd->audio_client);
 			prtd->audio_client = NULL;
 			return -ENOMEM;
 		}

 		pr_debug("%s: session ID %d\n", __func__,
 			prtd->audio_client->session);
 		prtd->session_id = prtd->audio_client->session;
 		msm_pcm_routing_reg_phy_stream(soc_prtd->dai_link->be_id,
 			prtd->session_id, substream->stream);
 	}

 	ret = q6asm_audio_client_buf_alloc_contiguous(dir,
 			prtd->audio_client,
 			runtime->hw.period_bytes_min,
 			runtime->hw.periods_max);
 	if (ret < 0) {
 		pr_err("Audio Start: Buffer Allocation failed \
 					rc = %d\n", ret);
 		return -ENOMEM;
 	}
 	buf = prtd->audio_client->port[dir].buf;
 	if (buf == NULL || buf[0].data == NULL)
 		return -ENOMEM;

 	pr_debug("%s:buf = %p\n", __func__, buf);
 	dma_buf->dev.type = SNDRV_DMA_TYPE_DEV;
 	dma_buf->dev.dev = substream->pcm->card->dev;
 	dma_buf->private_data = NULL;
 	dma_buf->area = buf[0].data;
 	dma_buf->addr =  buf[0].phys;
 	dma_buf->bytes = runtime->hw.buffer_bytes_max;
 	if (!dma_buf->area)
 		return -ENOMEM;

 	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
 	return 0;
 }

 static struct snd_pcm_ops msm_pcm_ops = {
 	.open           = msm_pcm_open,
 	.copy		= msm_pcm_copy,
 	.hw_params	= msm_pcm_hw_params,
 	.close          = msm_pcm_close,
 	.ioctl          = snd_pcm_lib_ioctl,
 	.prepare        = msm_pcm_prepare,
 	.trigger        = msm_pcm_trigger,
 	.pointer        = msm_pcm_pointer,
 	.mmap		= msm_pcm_mmap,
 };

 static int msm_asoc_pcm_new(struct snd_soc_pcm_runtime *rtd)
 {
 	struct snd_card *card = rtd->card->snd_card;
 	int ret = 0;

 	if (!card->dev->coherent_dma_mask)
 		card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
 	return ret;
 }

 static struct snd_soc_platform_driver msm_soc_platform = {
 	.ops		= &msm_pcm_ops,
 	.pcm_new	= msm_asoc_pcm_new,
 };

 static __devinit int msm_pcm_probe(struct platform_device *pdev)
 {
 	pr_info("%s: dev name %s\n", __func__, dev_name(&pdev->dev));
 	return snd_soc_register_platform(&pdev->dev,
 				   &msm_soc_platform);
 }

 static int msm_pcm_remove(struct platform_device *pdev)
 {
 	snd_soc_unregister_platform(&pdev->dev);
 	return 0;
 }

 static struct platform_driver msm_pcm_driver = {
 	.driver = {
 		.name = "msm-pcm-dsp",
 		.owner = THIS_MODULE,
 	},
 	.probe = msm_pcm_probe,
 	.remove = __devexit_p(msm_pcm_remove),
 };

 static int __init msm_soc_platform_init(void)
 {
 	init_waitqueue_head(&the_locks.enable_wait);
 	init_waitqueue_head(&the_locks.eos_wait);
 	init_waitqueue_head(&the_locks.write_wait);
 	init_waitqueue_head(&the_locks.read_wait);

 	return platform_driver_register(&msm_pcm_driver);
 }
 module_init(msm_soc_platform_init);

 static void __exit msm_soc_platform_exit(void)
 {
 	platform_driver_unregister(&msm_pcm_driver);
 }
 module_exit(msm_soc_platform_exit);

 MODULE_DESCRIPTION("PCM module platform driver");
 MODULE_LICENSE("GPL v2");
	/* Copyright (c) 2011-2012, Code Aurora Forum. All rights reserved.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 and
	* only version 2 as published by the Free Software Foundation.
	*
	* 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/init.h>
	#include <linux/err.h>
	#include <linux/module.h>
	#include <linux/moduleparam.h>
	#include <linux/time.h>
	#include <linux/wait.h>
	#include <linux/platform_device.h>
	#include <linux/slab.h>
	#include <sound/core.h>
	#include <sound/soc.h>
	#include <sound/soc-dapm.h>
	#include <sound/pcm.h>
	#include <sound/initval.h>
	#include <sound/control.h>
	#include <asm/dma.h>
	#include <linux/dma-mapping.h>
	#include <linux/android_pmem.h>

	#include "msm-pcm-q6.h"
	#include "msm-pcm-routing.h"

	static struct audio_locks the_locks;

	struct snd_msm {
	struct snd_card *card;
	struct snd_pcm *pcm;
	};

	#define PLAYBACK_NUM_PERIODS 8
	#define PLAYBACK_PERIOD_SIZE 2048
	#define CAPTURE_NUM_PERIODS 16
	#define CAPTURE_PERIOD_SIZE 320

	static struct snd_pcm_hardware msm_pcm_hardware_capture = {
	.info = (SNDRV_PCM_INFO_MMAP \|
	SNDRV_PCM_INFO_BLOCK_TRANSFER \|
	SNDRV_PCM_INFO_MMAP_VALID \|
	SNDRV_PCM_INFO_INTERLEAVED \|
	SNDRV_PCM_INFO_PAUSE \| SNDRV_PCM_INFO_RESUME),
	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	.rates = SNDRV_PCM_RATE_8000_48000,
	.rate_min = 8000,
	.rate_max = 48000,
	.channels_min = 1,
	.channels_max = 4,
	.buffer_bytes_max = CAPTURE_NUM_PERIODS * CAPTURE_PERIOD_SIZE,
	.period_bytes_min = CAPTURE_PERIOD_SIZE,
	.period_bytes_max = CAPTURE_PERIOD_SIZE,
	.periods_min = CAPTURE_NUM_PERIODS,
	.periods_max = CAPTURE_NUM_PERIODS,
	.fifo_size = 0,
	};

	static struct snd_pcm_hardware msm_pcm_hardware_playback = {
	.info = (SNDRV_PCM_INFO_MMAP \|
	SNDRV_PCM_INFO_BLOCK_TRANSFER \|
	SNDRV_PCM_INFO_MMAP_VALID \|
	SNDRV_PCM_INFO_INTERLEAVED \|
	SNDRV_PCM_INFO_PAUSE \| SNDRV_PCM_INFO_RESUME),
	.formats = SNDRV_PCM_FMTBIT_S16_LE,
	.rates = SNDRV_PCM_RATE_8000_48000 \| SNDRV_PCM_RATE_KNOT,
	.rate_min = 8000,
	.rate_max = 48000,
	.channels_min = 1,
	.channels_max = 2,
	.buffer_bytes_max = PLAYBACK_NUM_PERIODS * PLAYBACK_PERIOD_SIZE,
	.period_bytes_min = PLAYBACK_PERIOD_SIZE,
	.period_bytes_max = PLAYBACK_PERIOD_SIZE,
	.periods_min = PLAYBACK_NUM_PERIODS,
	.periods_max = PLAYBACK_NUM_PERIODS,
	.fifo_size = 0,
	};

	/* Conventional and unconventional sample rate supported */
	static unsigned int supported_sample_rates[] = {
	8000, 11025, 12000, 16000, 22050, 24000, 32000, 44100, 48000
	};

	static uint32_t in_frame_info[CAPTURE_NUM_PERIODS][2];

	static struct snd_pcm_hw_constraint_list constraints_sample_rates = {
	.count = ARRAY_SIZE(supported_sample_rates),
	.list = supported_sample_rates,
	.mask = 0,
	};

	static void event_handler(uint32_t opcode,
	uint32_t token, uint32_t payload, void priv)
	{
	struct msm_audio *prtd = priv;
	struct snd_pcm_substream *substream = prtd->substream;
	uint32_t ptrmem = (uint32_t )payload;
	int i = 0;
	uint32_t idx = 0;
	uint32_t size = 0;

	pr_debug("%s\n", __func__);
	switch (opcode) {
	case ASM_DATA_EVENT_WRITE_DONE: {
	pr_debug("ASM_DATA_EVENT_WRITE_DONE\n");
	pr_debug("Buffer Consumed = 0x%08x\n", *ptrmem);
	prtd->pcm_irq_pos += prtd->pcm_count;
	if (atomic_read(&prtd->start))
	snd_pcm_period_elapsed(substream);
	atomic_inc(&prtd->out_count);
	wake_up(&the_locks.write_wait);
	if (!atomic_read(&prtd->start))
	break;
	if (!prtd->mmap_flag)
	break;
	if (q6asm_is_cpu_buf_avail_nolock(IN,
	prtd->audio_client,
	&size, &idx)) {
	pr_debug("%s:writing %d bytes of buffer to dsp 2\n",
	__func__, prtd->pcm_count);
	q6asm_write_nolock(prtd->audio_client,
	prtd->pcm_count, 0, 0, NO_TIMESTAMP);
	}
	break;
	}
	case ASM_DATA_CMDRSP_EOS:
	pr_debug("ASM_DATA_CMDRSP_EOS\n");
	prtd->cmd_ack = 1;
	wake_up(&the_locks.eos_wait);
	break;
	case ASM_DATA_EVENT_READ_DONE: {
	pr_debug("ASM_DATA_EVENT_READ_DONE\n");
	pr_debug("token = 0x%08x\n", token);
	for (i = 0; i < 8; i++, ++ptrmem)
	pr_debug("cmd[%d]=0x%08x\n", i, *ptrmem);
	in_frame_info[token][0] = payload[2];
	in_frame_info[token][1] = payload[3];
	prtd->pcm_irq_pos += in_frame_info[token][0];
	pr_debug("pcm_irq_pos=%d\n", prtd->pcm_irq_pos);
	if (atomic_read(&prtd->start))
	snd_pcm_period_elapsed(substream);
	if (atomic_read(&prtd->in_count) <= prtd->periods)
	atomic_inc(&prtd->in_count);
	wake_up(&the_locks.read_wait);
	if (prtd->mmap_flag
	&& q6asm_is_cpu_buf_avail_nolock(OUT,
	prtd->audio_client,
	&size, &idx))
	q6asm_read_nolock(prtd->audio_client);
	break;
	}
	case APR_BASIC_RSP_RESULT: {
	switch (payload[0]) {
	case ASM_SESSION_CMD_RUN:
	if (substream->stream
	!= SNDRV_PCM_STREAM_PLAYBACK) {
	atomic_set(&prtd->start, 1);
	break;
	}
	if (prtd->mmap_flag) {
	pr_debug("%s:writing %d bytes"
	" of buffer to dsp\n",
	__func__,
	prtd->pcm_count);
	q6asm_write_nolock(prtd->audio_client,
	prtd->pcm_count,
	0, 0, NO_TIMESTAMP);
	} else {
	while (atomic_read(&prtd->out_needed)) {
	pr_debug("%s:writing %d bytes"
	" of buffer to dsp\n",
	__func__,
	prtd->pcm_count);
	q6asm_write_nolock(prtd->audio_client,
	prtd->pcm_count,
	0, 0, NO_TIMESTAMP);
	atomic_dec(&prtd->out_needed);
	wake_up(&the_locks.write_wait);
	};
	}
	atomic_set(&prtd->start, 1);
	break;
	default:
	break;
	}
	}
	break;
	default:
	pr_debug("Not Supported Event opcode[0x%x]\n", opcode);
	break;
	}
	}

	static int msm_pcm_playback_prepare(struct snd_pcm_substream *substream)
	{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct msm_audio *prtd = runtime->private_data;
	int ret;

	pr_debug("%s\n", __func__);
	prtd->pcm_size = snd_pcm_lib_buffer_bytes(substream);
	prtd->pcm_count = snd_pcm_lib_period_bytes(substream);
	prtd->pcm_irq_pos = 0;
	/* rate and channels are sent to audio driver */
	prtd->samp_rate = runtime->rate;
	prtd->channel_mode = runtime->channels;
	if (prtd->enabled)
	return 0;

	ret = q6asm_media_format_block_pcm(prtd->audio_client, runtime->rate,
	runtime->channels);
	if (ret < 0)
	pr_info("%s: CMD Format block failed\n", __func__);

	atomic_set(&prtd->out_count, runtime->periods);

	prtd->enabled = 1;
	prtd->cmd_ack = 0;

	return 0;
	}

	static int msm_pcm_capture_prepare(struct snd_pcm_substream *substream)
	{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct msm_audio *prtd = runtime->private_data;
	int ret = 0;
	int i = 0;
	pr_debug("%s\n", __func__);
	prtd->pcm_size = snd_pcm_lib_buffer_bytes(substream);
	prtd->pcm_count = snd_pcm_lib_period_bytes(substream);
	prtd->pcm_irq_pos = 0;

	/* rate and channels are sent to audio driver */
	prtd->samp_rate = runtime->rate;
	prtd->channel_mode = runtime->channels;

	if (prtd->enabled)
	return 0;

	pr_debug("Samp_rate = %d\n", prtd->samp_rate);
	pr_debug("Channel = %d\n", prtd->channel_mode);
	if (prtd->channel_mode > 2) {
	ret = q6asm_enc_cfg_blk_multi_ch_pcm(prtd->audio_client,
	prtd->samp_rate, prtd->channel_mode);
	} else {
	ret = q6asm_enc_cfg_blk_pcm(prtd->audio_client,
	prtd->samp_rate, prtd->channel_mode);
	}

	if (ret < 0)
	pr_debug("%s: cmd cfg pcm was block failed", __func__);

	for (i = 0; i < runtime->periods; i++)
	q6asm_read(prtd->audio_client);
	prtd->periods = runtime->periods;

	prtd->enabled = 1;

	return ret;
	}

	static int msm_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
	{
	int ret = 0;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct msm_audio *prtd = runtime->private_data;

	switch (cmd) {
	case SNDRV_PCM_TRIGGER_START:
	case SNDRV_PCM_TRIGGER_RESUME:
	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
	pr_debug("%s: Trigger start\n", __func__);
	q6asm_run_nowait(prtd->audio_client, 0, 0, 0);
	break;
	case SNDRV_PCM_TRIGGER_STOP:
	pr_debug("SNDRV_PCM_TRIGGER_STOP\n");
	atomic_set(&prtd->start, 0);
	if (substream->stream != SNDRV_PCM_STREAM_PLAYBACK)
	break;
	prtd->cmd_ack = 0;
	q6asm_cmd_nowait(prtd->audio_client, CMD_EOS);
	break;
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
	pr_debug("SNDRV_PCM_TRIGGER_PAUSE\n");
	q6asm_cmd_nowait(prtd->audio_client, CMD_PAUSE);
	atomic_set(&prtd->start, 0);
	break;
	default:
	ret = -EINVAL;
	break;
	}

	return ret;
	}

	static int msm_pcm_open(struct snd_pcm_substream *substream)
	{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_soc_pcm_runtime *soc_prtd = substream->private_data;
	struct msm_audio *prtd;
	int ret = 0;

	pr_debug("%s\n", __func__);
	prtd = kzalloc(sizeof(struct msm_audio), GFP_KERNEL);
	if (prtd == NULL) {
	pr_err("Failed to allocate memory for msm_audio\n");
	return -ENOMEM;
	}
	prtd->substream = substream;
	prtd->audio_client = q6asm_audio_client_alloc(
	(app_cb)event_handler, prtd);
	if (!prtd->audio_client) {
	pr_info("%s: Could not allocate memory\n", __func__);
	kfree(prtd);
	return -ENOMEM;
	}
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
	runtime->hw = msm_pcm_hardware_playback;
	ret = q6asm_open_write(prtd->audio_client, FORMAT_LINEAR_PCM);
	if (ret < 0) {
	pr_err("%s: pcm out open failed\n", __func__);
	q6asm_audio_client_free(prtd->audio_client);
	kfree(prtd);
	return -ENOMEM;
	}

	pr_debug("%s: session ID %d\n", __func__,
	prtd->audio_client->session);
	prtd->session_id = prtd->audio_client->session;
	msm_pcm_routing_reg_phy_stream(soc_prtd->dai_link->be_id,
	prtd->session_id, substream->stream);
	prtd->cmd_ack = 1;

	}
	/* Capture path */
	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
	runtime->hw = msm_pcm_hardware_capture;
	}

	ret = snd_pcm_hw_constraint_list(runtime, 0,
	SNDRV_PCM_HW_PARAM_RATE,
	&constraints_sample_rates);
	if (ret < 0)
	pr_info("snd_pcm_hw_constraint_list failed\n");
	/* Ensure that buffer size is a multiple of period size */
	ret = snd_pcm_hw_constraint_integer(runtime,
	SNDRV_PCM_HW_PARAM_PERIODS);
	if (ret < 0)
	pr_info("snd_pcm_hw_constraint_integer failed\n");

	prtd->dsp_cnt = 0;
	runtime->private_data = prtd;

	return 0;
	}

	static int msm_pcm_playback_copy(struct snd_pcm_substream *substream, int a,
	snd_pcm_uframes_t hwoff, void __user *buf, snd_pcm_uframes_t frames)
	{
	int ret = 0;
	int fbytes = 0;
	int xfer = 0;
	char *bufptr = NULL;
	void *data = NULL;
	uint32_t idx = 0;
	uint32_t size = 0;

	struct snd_pcm_runtime *runtime = substream->runtime;
	struct msm_audio *prtd = runtime->private_data;

	fbytes = frames_to_bytes(runtime, frames);
	pr_debug("%s: prtd->out_count = %d\n",
	__func__, atomic_read(&prtd->out_count));
	ret = wait_event_timeout(the_locks.write_wait,
	(atomic_read(&prtd->out_count)), 5 * HZ);
	if (ret < 0) {
	pr_err("%s: wait_event_timeout failed\n", __func__);
	goto fail;
	}

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

	data = q6asm_is_cpu_buf_avail(IN, prtd->audio_client, &size, &idx);
	bufptr = data;
	if (bufptr) {
	pr_debug("%s:fbytes =%d: xfer=%d size=%d\n",
	__func__, fbytes, xfer, size);
	xfer = fbytes;
	if (copy_from_user(bufptr, buf, xfer)) {
	ret = -EFAULT;
	goto fail;
	}
	buf += xfer;
	fbytes -= xfer;
	pr_debug("%s:fbytes = %d: xfer=%d\n", __func__, fbytes, xfer);
	if (atomic_read(&prtd->start)) {
	pr_debug("%s:writing %d bytes of buffer to dsp\n",
	__func__, xfer);
	ret = q6asm_write(prtd->audio_client, xfer,
	0, 0, NO_TIMESTAMP);
	if (ret < 0) {
	ret = -EFAULT;
	goto fail;
	}
	} else
	atomic_inc(&prtd->out_needed);
	atomic_dec(&prtd->out_count);
	}
	fail:
	return ret;
	}

	static int msm_pcm_playback_close(struct snd_pcm_substream *substream)
	{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_soc_pcm_runtime *soc_prtd = substream->private_data;
	struct msm_audio *prtd = runtime->private_data;
	int dir = 0;
	int ret = 0;

	pr_debug("%s\n", __func__);

	dir = IN;
	ret = wait_event_timeout(the_locks.eos_wait,
	prtd->cmd_ack, 5 * HZ);
	if (ret < 0)
	pr_err("%s: CMD_EOS failed\n", __func__);
	q6asm_cmd(prtd->audio_client, CMD_CLOSE);
	q6asm_audio_client_buf_free_contiguous(dir,
	prtd->audio_client);

	msm_pcm_routing_dereg_phy_stream(soc_prtd->dai_link->be_id,
	SNDRV_PCM_STREAM_PLAYBACK);
	q6asm_audio_client_free(prtd->audio_client);
	kfree(prtd);
	return 0;
	}

	static int msm_pcm_capture_copy(struct snd_pcm_substream *substream,
	int channel, snd_pcm_uframes_t hwoff, void __user *buf,
	snd_pcm_uframes_t frames)
	{
	int ret = 0;
	int fbytes = 0;
	int xfer;
	char *bufptr;
	void *data = NULL;
	static uint32_t idx;
	static uint32_t size;
	uint32_t offset = 0;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct msm_audio *prtd = substream->runtime->private_data;


	pr_debug("%s\n", __func__);
	fbytes = frames_to_bytes(runtime, frames);

	pr_debug("appl_ptr %d\n", (int)runtime->control->appl_ptr);
	pr_debug("hw_ptr %d\n", (int)runtime->status->hw_ptr);
	pr_debug("avail_min %d\n", (int)runtime->control->avail_min);

	ret = wait_event_timeout(the_locks.read_wait,
	(atomic_read(&prtd->in_count)), 5 * HZ);
	if (ret < 0) {
	pr_debug("%s: wait_event_timeout failed\n", __func__);
	goto fail;
	}
	if (!atomic_read(&prtd->in_count)) {
	pr_debug("%s: pcm stopped in_count 0\n", __func__);
	return 0;
	}
	pr_debug("Checking if valid buffer is available...%08x\n",
	(unsigned int) data);
	data = q6asm_is_cpu_buf_avail(OUT, prtd->audio_client, &size, &idx);
	bufptr = data;
	pr_debug("Size = %d\n", size);
	pr_debug("fbytes = %d\n", fbytes);
	pr_debug("idx = %d\n", idx);
	if (bufptr) {
	xfer = fbytes;
	if (xfer > size)
	xfer = size;
	offset = in_frame_info[idx][1];
	pr_debug("Offset value = %d\n", offset);
	if (copy_to_user(buf, bufptr+offset, xfer)) {
	pr_err("Failed to copy buf to user\n");
	ret = -EFAULT;
	goto fail;
	}
	fbytes -= xfer;
	size -= xfer;
	in_frame_info[idx][1] += xfer;
	pr_debug("%s:fbytes = %d: size=%d: xfer=%d\n",
	__func__, fbytes, size, xfer);
	pr_debug(" Sending next buffer to dsp\n");
	memset(&in_frame_info[idx], 0,
	sizeof(uint32_t) * 2);
	atomic_dec(&prtd->in_count);
	ret = q6asm_read(prtd->audio_client);
	if (ret < 0) {
	pr_err("q6asm read failed\n");
	ret = -EFAULT;
	goto fail;
	}
	} else
	pr_err("No valid buffer\n");

	pr_debug("Returning from capture_copy... %d\n", ret);
	fail:
	return ret;
	}

	static int msm_pcm_capture_close(struct snd_pcm_substream *substream)
	{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_soc_pcm_runtime *soc_prtd = substream->private_data;
	struct msm_audio *prtd = runtime->private_data;
	int dir = OUT;

	pr_debug("%s\n", __func__);
	if (prtd->audio_client) {
	q6asm_cmd(prtd->audio_client, CMD_CLOSE);
	q6asm_audio_client_buf_free_contiguous(dir,
	prtd->audio_client);
	q6asm_audio_client_free(prtd->audio_client);
	}

	msm_pcm_routing_dereg_phy_stream(soc_prtd->dai_link->be_id,
	SNDRV_PCM_STREAM_CAPTURE);
	kfree(prtd);

	return 0;
	}

	static int msm_pcm_copy(struct snd_pcm_substream *substream, int a,
	snd_pcm_uframes_t hwoff, void __user *buf, snd_pcm_uframes_t frames)
	{
	int ret = 0;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	ret = msm_pcm_playback_copy(substream, a, hwoff, buf, frames);
	else if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
	ret = msm_pcm_capture_copy(substream, a, hwoff, buf, frames);
	return ret;
	}

	static int msm_pcm_close(struct snd_pcm_substream *substream)
	{
	int ret = 0;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	ret = msm_pcm_playback_close(substream);
	else if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
	ret = msm_pcm_capture_close(substream);
	return ret;
	}
	static int msm_pcm_prepare(struct snd_pcm_substream *substream)
	{
	int ret = 0;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	ret = msm_pcm_playback_prepare(substream);
	else if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
	ret = msm_pcm_capture_prepare(substream);
	return ret;
	}

	static snd_pcm_uframes_t msm_pcm_pointer(struct snd_pcm_substream *substream)
	{

	struct snd_pcm_runtime *runtime = substream->runtime;
	struct msm_audio *prtd = runtime->private_data;

	if (prtd->pcm_irq_pos >= prtd->pcm_size)
	prtd->pcm_irq_pos = 0;

	pr_debug("pcm_irq_pos = %d\n", prtd->pcm_irq_pos);
	return bytes_to_frames(runtime, (prtd->pcm_irq_pos));
	}

	static int msm_pcm_mmap(struct snd_pcm_substream *substream,
	struct vm_area_struct *vma)
	{
	int result = 0;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct msm_audio *prtd = runtime->private_data;

	pr_debug("%s\n", __func__);
	prtd->mmap_flag = 1;

	if (runtime->dma_addr && runtime->dma_bytes) {
	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
	result = remap_pfn_range(vma, vma->vm_start,
	runtime->dma_addr >> PAGE_SHIFT,
	runtime->dma_bytes,
	vma->vm_page_prot);
	} else {
	pr_err("Physical address or size of buf is NULL");
	return -EINVAL;
	}

	return result;
	}

	static int msm_pcm_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params)
	{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct msm_audio *prtd = runtime->private_data;
	struct snd_dma_buffer *dma_buf = &substream->dma_buffer;
	struct snd_soc_pcm_runtime *soc_prtd = substream->private_data;
	struct audio_buffer *buf;
	int dir, ret;
	int format = FORMAT_LINEAR_PCM;

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
	dir = IN;
	else
	dir = OUT;

	/capture path/
	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
	if (params_channels(params) > 2)
	format = FORMAT_MULTI_CHANNEL_LINEAR_PCM;
	pr_debug("%s format = :0x%x\n", __func__, format);

	ret = q6asm_open_read(prtd->audio_client, format);
	if (ret < 0) {
	pr_err("%s: q6asm_open_read failed\n", __func__);
	q6asm_audio_client_free(prtd->audio_client);
	prtd->audio_client = NULL;
	return -ENOMEM;
	}

	pr_debug("%s: session ID %d\n", __func__,
	prtd->audio_client->session);
	prtd->session_id = prtd->audio_client->session;
	msm_pcm_routing_reg_phy_stream(soc_prtd->dai_link->be_id,
	prtd->session_id, substream->stream);
	}

	ret = q6asm_audio_client_buf_alloc_contiguous(dir,
	prtd->audio_client,
	runtime->hw.period_bytes_min,
	runtime->hw.periods_max);
	if (ret < 0) {
	pr_err("Audio Start: Buffer Allocation failed \
	rc = %d\n", ret);
	return -ENOMEM;
	}
	buf = prtd->audio_client->port[dir].buf;
	if (buf == NULL \|\| buf[0].data == NULL)
	return -ENOMEM;

	pr_debug("%s:buf = %p\n", __func__, buf);
	dma_buf->dev.type = SNDRV_DMA_TYPE_DEV;
	dma_buf->dev.dev = substream->pcm->card->dev;
	dma_buf->private_data = NULL;
	dma_buf->area = buf[0].data;
	dma_buf->addr = buf[0].phys;
	dma_buf->bytes = runtime->hw.buffer_bytes_max;
	if (!dma_buf->area)
	return -ENOMEM;

	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);
	return 0;
	}

	static struct snd_pcm_ops msm_pcm_ops = {
	.open = msm_pcm_open,
	.copy = msm_pcm_copy,
	.hw_params = msm_pcm_hw_params,
	.close = msm_pcm_close,
	.ioctl = snd_pcm_lib_ioctl,
	.prepare = msm_pcm_prepare,
	.trigger = msm_pcm_trigger,
	.pointer = msm_pcm_pointer,
	.mmap = msm_pcm_mmap,
	};

	static int msm_asoc_pcm_new(struct snd_soc_pcm_runtime *rtd)
	{
	struct snd_card *card = rtd->card->snd_card;
	int ret = 0;

	if (!card->dev->coherent_dma_mask)
	card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
	return ret;
	}

	static struct snd_soc_platform_driver msm_soc_platform = {
	.ops = &msm_pcm_ops,
	.pcm_new = msm_asoc_pcm_new,
	};

	static __devinit int msm_pcm_probe(struct platform_device *pdev)
	{
	pr_info("%s: dev name %s\n", __func__, dev_name(&pdev->dev));
	return snd_soc_register_platform(&pdev->dev,
	&msm_soc_platform);
	}

	static int msm_pcm_remove(struct platform_device *pdev)
	{
	snd_soc_unregister_platform(&pdev->dev);
	return 0;
	}

	static struct platform_driver msm_pcm_driver = {
	.driver = {
	.name = "msm-pcm-dsp",
	.owner = THIS_MODULE,
	},
	.probe = msm_pcm_probe,
	.remove = __devexit_p(msm_pcm_remove),
	};

	static int __init msm_soc_platform_init(void)
	{
	init_waitqueue_head(&the_locks.enable_wait);
	init_waitqueue_head(&the_locks.eos_wait);
	init_waitqueue_head(&the_locks.write_wait);
	init_waitqueue_head(&the_locks.read_wait);

	return platform_driver_register(&msm_pcm_driver);
	}
	module_init(msm_soc_platform_init);

	static void __exit msm_soc_platform_exit(void)
	{
	platform_driver_unregister(&msm_pcm_driver);
	}
	module_exit(msm_soc_platform_exit);

	MODULE_DESCRIPTION("PCM module platform driver");
	MODULE_LICENSE("GPL v2");