asoc/msm-pcm-afe-v2.c

// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (c) 2012-2018, The Linux Foundation. All rights reserved.
 */


#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 <linux/dma-mapping.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 <dsp/msm_audio_ion.h>
#include <dsp/q6adm-v2.h>
#include "msm-pcm-afe-v2.h"

#define DRV_NAME "msm-pcm-afe-v2"

#define MIN_PLAYBACK_PERIOD_SIZE (128 * 2)
#define MAX_PLAYBACK_PERIOD_SIZE (128 * 2 * 2 * 6)
#define MIN_PLAYBACK_NUM_PERIODS (4)
#define MAX_PLAYBACK_NUM_PERIODS (384)

#define MIN_CAPTURE_PERIOD_SIZE (128 * 2)
#define MAX_CAPTURE_PERIOD_SIZE (192 * 2 * 2 * 8 * 4)
#define MIN_CAPTURE_NUM_PERIODS (4)
#define MAX_CAPTURE_NUM_PERIODS (384)

static struct snd_pcm_hardware msm_afe_hardware_playback = {
	.info =                 (SNDRV_PCM_INFO_MMAP |
				SNDRV_PCM_INFO_BLOCK_TRANSFER |
				SNDRV_PCM_INFO_MMAP_VALID |
				SNDRV_PCM_INFO_INTERLEAVED),
	.formats =              SNDRV_PCM_FMTBIT_S16_LE|
				SNDRV_PCM_FMTBIT_S24_LE,
	.rates =                (SNDRV_PCM_RATE_8000 |
				SNDRV_PCM_RATE_16000 |
				SNDRV_PCM_RATE_48000),
	.rate_min =             8000,
	.rate_max =             48000,
	.channels_min =         1,
	.channels_max =         6,
	.buffer_bytes_max =     MAX_PLAYBACK_PERIOD_SIZE *
				MAX_PLAYBACK_NUM_PERIODS,
	.period_bytes_min =     MIN_PLAYBACK_PERIOD_SIZE,
	.period_bytes_max =     MAX_PLAYBACK_PERIOD_SIZE,
	.periods_min =          MIN_PLAYBACK_NUM_PERIODS,
	.periods_max =          MAX_PLAYBACK_NUM_PERIODS,
	.fifo_size =            0,
};

static struct snd_pcm_hardware msm_afe_hardware_capture = {
	.info =                 (SNDRV_PCM_INFO_MMAP |
				SNDRV_PCM_INFO_BLOCK_TRANSFER |
				SNDRV_PCM_INFO_MMAP_VALID |
				SNDRV_PCM_INFO_INTERLEAVED),
	.formats =              SNDRV_PCM_FMTBIT_S16_LE|
				SNDRV_PCM_FMTBIT_S24_LE,
	.rates =                (SNDRV_PCM_RATE_8000 |
				SNDRV_PCM_RATE_16000 |
				SNDRV_PCM_RATE_48000),
	.rate_min =             8000,
	.rate_max =             48000,
	.channels_min =         1,
	.channels_max =         6,
	.buffer_bytes_max =     MAX_CAPTURE_PERIOD_SIZE *
				MAX_CAPTURE_NUM_PERIODS,
	.period_bytes_min =     MIN_CAPTURE_PERIOD_SIZE,
	.period_bytes_max =     MAX_CAPTURE_PERIOD_SIZE,
	.periods_min =          MIN_CAPTURE_NUM_PERIODS,
	.periods_max =          MAX_CAPTURE_NUM_PERIODS,
	.fifo_size =            0,
};


static enum hrtimer_restart afe_hrtimer_callback(struct hrtimer *hrt);
static enum hrtimer_restart afe_hrtimer_rec_callback(struct hrtimer *hrt);

static enum hrtimer_restart afe_hrtimer_callback(struct hrtimer *hrt)
{
	struct pcm_afe_info *prtd =
		container_of(hrt, struct pcm_afe_info, hrt);
	struct snd_pcm_substream *substream = prtd->substream;
	struct snd_pcm_runtime *runtime = substream->runtime;
	u32 mem_map_handle = 0;

	mem_map_handle = afe_req_mmap_handle(prtd->audio_client);
	if (!mem_map_handle)
		pr_err("%s: mem_map_handle is NULL\n", __func__);

	if (prtd->start) {
		pr_debug("sending frame to DSP: poll_time: %d\n",
				prtd->poll_time);
		if (prtd->dsp_cnt == runtime->periods)
			prtd->dsp_cnt = 0;
		pr_debug("%s: mem_map_handle 0x%x\n", __func__, mem_map_handle);
		afe_rt_proxy_port_write(
		(prtd->dma_addr +
		(prtd->dsp_cnt *
		snd_pcm_lib_period_bytes(prtd->substream))), mem_map_handle,
		snd_pcm_lib_period_bytes(prtd->substream));
		prtd->dsp_cnt++;
		hrtimer_forward_now(hrt, ns_to_ktime(prtd->poll_time
					* 1000));

		return HRTIMER_RESTART;
	} else
		return HRTIMER_NORESTART;
}
static enum hrtimer_restart afe_hrtimer_rec_callback(struct hrtimer *hrt)
{
	struct pcm_afe_info *prtd =
		container_of(hrt, struct pcm_afe_info, hrt);
	struct snd_pcm_substream *substream = prtd->substream;
	struct snd_pcm_runtime *runtime = substream->runtime;
	u32 mem_map_handle = 0;
	int ret;

	mem_map_handle = afe_req_mmap_handle(prtd->audio_client);
	if (!mem_map_handle)
		pr_err("%s: mem_map_handle is NULL\n", __func__);

	if (prtd->start) {
		if (prtd->dsp_cnt == runtime->periods)
			prtd->dsp_cnt = 0;
		pr_debug("%s: mem_map_handle 0x%x\n", __func__, mem_map_handle);
		ret = afe_rt_proxy_port_read(
		(prtd->dma_addr + (prtd->dsp_cnt
		* snd_pcm_lib_period_bytes(prtd->substream))), mem_map_handle,
		snd_pcm_lib_period_bytes(prtd->substream));
		if (ret < 0) {
			pr_err("%s: AFE port read fails: %d\n", __func__, ret);
			prtd->start = 0;
			return HRTIMER_NORESTART;
		}
		prtd->dsp_cnt++;
		pr_debug("sending frame rec to DSP: poll_time: %d\n",
				prtd->poll_time);
		hrtimer_forward_now(hrt, ns_to_ktime(prtd->poll_time
				* 1000));

		return HRTIMER_RESTART;
	} else
		return HRTIMER_NORESTART;
}
static void pcm_afe_process_tx_pkt(uint32_t opcode,
		uint32_t token, uint32_t *payload,
		 void *priv)
{
	struct pcm_afe_info *prtd = priv;
	unsigned long dsp_flags;
	struct snd_pcm_substream *substream = NULL;
	struct snd_pcm_runtime *runtime = NULL;
	uint16_t event;
	uint64_t period_bytes;
	uint64_t bytes_one_sec;

	if (prtd == NULL)
		return;
	substream =  prtd->substream;
	runtime = substream->runtime;
	pr_debug("%s\n", __func__);
	spin_lock_irqsave(&prtd->dsp_lock, dsp_flags);
	switch (opcode) {
	case AFE_EVENT_RT_PROXY_PORT_STATUS: {
		event = (uint16_t)((0xFFFF0000 & payload[0]) >> 0x10);
			switch (event) {
			case AFE_EVENT_RTPORT_START: {
				prtd->dsp_cnt = 0;
				/* Calculate poll time.
				 * Split steps to avoid overflow.
				 * Poll time-time corresponding to one period
				 * in bytes.
				 * (Samplerate * channelcount * format) =
				 * bytes in 1 sec.
				 * Poll time =
				 *	(period bytes / bytes in one sec) *
				 *	 1000000 micro seconds.
				 * Multiplication by 1000000 is done in two
				 * steps to keep the accuracy of poll time.
				 */
				if (prtd->mmap_flag) {
					period_bytes = ((uint64_t)(
						(snd_pcm_lib_period_bytes(
							prtd->substream)) *
							1000));
					bytes_one_sec = (runtime->rate
						* runtime->channels * 2);
					bytes_one_sec =
						div_u64(bytes_one_sec, 1000);
					prtd->poll_time =
						div_u64(period_bytes,
						bytes_one_sec);
					pr_debug("prtd->poll_time: %d",
							prtd->poll_time);
				}
				break;
			}
			case AFE_EVENT_RTPORT_STOP:
				pr_debug("%s: event!=0\n", __func__);
				prtd->start = 0;
				snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
				break;
			case AFE_EVENT_RTPORT_LOW_WM:
				pr_debug("%s: Underrun\n", __func__);
				break;
			case AFE_EVENT_RTPORT_HI_WM:
				pr_debug("%s: Overrun\n", __func__);
				break;
			default:
				break;
			}
			break;
	}
	case APR_BASIC_RSP_RESULT: {
		switch (payload[0]) {
		case AFE_PORT_DATA_CMD_RT_PROXY_PORT_WRITE_V2:
			pr_debug("write done\n");
			prtd->pcm_irq_pos += snd_pcm_lib_period_bytes
							(prtd->substream);
			snd_pcm_period_elapsed(prtd->substream);
			break;
		default:
			break;
		}
		break;
	}
	case RESET_EVENTS:
		prtd->pcm_irq_pos += snd_pcm_lib_period_bytes
						(prtd->substream);
		prtd->reset_event = true;
		snd_pcm_period_elapsed(prtd->substream);
		break;
	default:
		break;
	}
	spin_unlock_irqrestore(&prtd->dsp_lock, dsp_flags);
}

static void pcm_afe_process_rx_pkt(uint32_t opcode,
		uint32_t token, uint32_t *payload,
		 void *priv)
{
	struct pcm_afe_info *prtd = priv;
	unsigned long dsp_flags;
	struct snd_pcm_substream *substream = NULL;
	struct snd_pcm_runtime *runtime = NULL;
	uint16_t event;
	uint64_t period_bytes;
	uint64_t bytes_one_sec;
	uint32_t mem_map_handle = 0;

	if (prtd == NULL)
		return;
	substream =  prtd->substream;
	runtime = substream->runtime;
	pr_debug("%s\n", __func__);
	spin_lock_irqsave(&prtd->dsp_lock, dsp_flags);
	switch (opcode) {
	case AFE_EVENT_RT_PROXY_PORT_STATUS: {
		event = (uint16_t)((0xFFFF0000 & payload[0]) >> 0x10);
		switch (event) {
		case AFE_EVENT_RTPORT_START: {
			prtd->dsp_cnt = 0;
			/* Calculate poll time. Split steps to avoid overflow.
			 * Poll time-time corresponding to one period in bytes.
			 * (Samplerate * channelcount * format)=bytes in 1 sec.
			 * Poll time =  (period bytes / bytes in one sec) *
			 * 1000000 micro seconds.
			 * Multiplication by 1000000 is done in two steps to
			 * keep the accuracy of poll time.
			 */
			if (prtd->mmap_flag) {
				period_bytes = ((uint64_t)(
					(snd_pcm_lib_period_bytes(
					prtd->substream)) * 1000));
				bytes_one_sec = (runtime->rate *
						runtime->channels * 2);
				bytes_one_sec = div_u64(bytes_one_sec, 1000);
				prtd->poll_time =
					div_u64(period_bytes, bytes_one_sec);
				pr_debug("prtd->poll_time : %d\n",
					prtd->poll_time);
			} else {
				mem_map_handle =
					afe_req_mmap_handle(prtd->audio_client);
				if (!mem_map_handle)
					pr_err("%s:mem_map_handle is NULL\n",
							 __func__);
				/* Do initial read to start transfer */
				afe_rt_proxy_port_read((prtd->dma_addr +
					(prtd->dsp_cnt *
					snd_pcm_lib_period_bytes(
						prtd->substream))),
					mem_map_handle,
					snd_pcm_lib_period_bytes(
						prtd->substream));
				prtd->dsp_cnt++;
			}
			break;
		}
		case AFE_EVENT_RTPORT_STOP:
			pr_debug("%s: event!=0\n", __func__);
			prtd->start = 0;
			snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
			break;
		case AFE_EVENT_RTPORT_LOW_WM:
			pr_debug("%s: Underrun\n", __func__);
			break;
		case AFE_EVENT_RTPORT_HI_WM:
			pr_debug("%s: Overrun\n", __func__);
			break;
		default:
			break;
		}
		break;
	}
	case APR_BASIC_RSP_RESULT: {
		switch (payload[0]) {
		case AFE_PORT_DATA_CMD_RT_PROXY_PORT_READ_V2:
			pr_debug("%s :Read done\n", __func__);
			prtd->pcm_irq_pos += snd_pcm_lib_period_bytes
							(prtd->substream);
			if (!prtd->mmap_flag) {
				atomic_set(&prtd->rec_bytes_avail, 1);
				wake_up(&prtd->read_wait);
			}
			snd_pcm_period_elapsed(prtd->substream);
			break;
		default:
			break;
		}
		break;
	}
	case RESET_EVENTS:
		prtd->pcm_irq_pos += snd_pcm_lib_period_bytes
							(prtd->substream);
		prtd->reset_event = true;
		if (!prtd->mmap_flag) {
			atomic_set(&prtd->rec_bytes_avail, 1);
			wake_up(&prtd->read_wait);
		}
		snd_pcm_period_elapsed(prtd->substream);
		break;
	default:
		break;
	}
	spin_unlock_irqrestore(&prtd->dsp_lock, dsp_flags);
}

static int msm_afe_playback_prepare(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct pcm_afe_info *prtd = runtime->private_data;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_dai *dai = rtd->cpu_dai;
	int ret = 0;

	pr_debug("%s: sample_rate=%d\n", __func__, runtime->rate);

	pr_debug("%s: dai->id =%x\n", __func__, dai->id);
	ret = afe_register_get_events(dai->id,
			pcm_afe_process_tx_pkt, prtd);
	if (ret < 0) {
		pr_err("afe-pcm:register for events failed\n");
		return ret;
	}
	pr_debug("%s:success\n", __func__);
	prtd->prepared++;
	return ret;
}

static int msm_afe_capture_prepare(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct pcm_afe_info *prtd = runtime->private_data;
	struct snd_soc_pcm_runtime *rtd = substream->private_data;
	struct snd_soc_dai *dai = rtd->cpu_dai;
	int ret = 0;

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

	pr_debug("%s: dai->id =%x\n", __func__, dai->id);
	ret = afe_register_get_events(dai->id,
			pcm_afe_process_rx_pkt, prtd);
	if (ret < 0) {
		pr_err("afe-pcm:register for events failed\n");
		return ret;
	}
	pr_debug("%s:success\n", __func__);
	prtd->prepared++;
	return 0;
}

/* Conventional and unconventional sample rate supported */
static unsigned int supported_sample_rates[] = {
	8000, 16000, 48000
};

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

static int msm_afe_open(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct pcm_afe_info *prtd = NULL;
	int ret = 0;

	prtd = kzalloc(sizeof(struct pcm_afe_info), GFP_KERNEL);
	if (prtd == NULL)
		return -ENOMEM;
	pr_debug("prtd %pK\n", prtd);

	mutex_init(&prtd->lock);
	spin_lock_init(&prtd->dsp_lock);
	prtd->dsp_cnt = 0;

	mutex_lock(&prtd->lock);

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		runtime->hw = msm_afe_hardware_playback;
	else
		runtime->hw = msm_afe_hardware_capture;

	prtd->substream = substream;
	runtime->private_data = prtd;
	prtd->audio_client = q6afe_audio_client_alloc(prtd);
	if (!prtd->audio_client) {
		pr_debug("%s: Could not allocate memory\n", __func__);
		mutex_unlock(&prtd->lock);
		kfree(prtd);
		return -ENOMEM;
	}

	atomic_set(&prtd->rec_bytes_avail, 0);
	init_waitqueue_head(&prtd->read_wait);

	hrtimer_init(&prtd->hrt, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		prtd->hrt.function = afe_hrtimer_callback;
	else if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
		prtd->hrt.function = afe_hrtimer_rec_callback;

	mutex_unlock(&prtd->lock);
	ret = snd_pcm_hw_constraint_list(runtime, 0,
				SNDRV_PCM_HW_PARAM_RATE,
				&constraints_sample_rates);
	if (ret < 0)
		pr_err("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_err("snd_pcm_hw_constraint_integer failed\n");

	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
		ret = snd_pcm_hw_constraint_minmax(runtime,
			SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
			MIN_CAPTURE_NUM_PERIODS * MIN_CAPTURE_PERIOD_SIZE,
			MAX_CAPTURE_NUM_PERIODS * MAX_CAPTURE_PERIOD_SIZE);

		if (ret < 0) {
			pr_err("constraint for buffer bytes min max ret = %d\n",
			      ret);
		}
	}

	prtd->reset_event = false;
	return 0;
}

static int msm_afe_playback_copy(struct snd_pcm_substream *substream,
				int channel, unsigned long hwoff,
				void __user *buf, unsigned long fbytes)
{
	int ret = 0;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct pcm_afe_info *prtd = runtime->private_data;
	char *hwbuf = runtime->dma_area + hwoff;
	u32 mem_map_handle = 0;

	pr_debug("%s : appl_ptr 0x%lx hw_ptr 0x%lx dest_to_copy 0x%pK\n",
		__func__,
		runtime->control->appl_ptr, runtime->status->hw_ptr, hwbuf);

	if (copy_from_user(hwbuf, buf, fbytes)) {
		pr_err("%s :Failed to copy audio from user buffer\n",
			__func__);

		ret = -EFAULT;
		goto fail;
	}

	if (!prtd->mmap_flag) {
		mem_map_handle = afe_req_mmap_handle(prtd->audio_client);
		if (!mem_map_handle) {
			pr_err("%s: mem_map_handle is NULL\n", __func__);
			ret = -EFAULT;
			goto fail;
		}

		pr_debug("%s : prtd-> dma_addr 0x%lx dsp_cnt %d\n", __func__,
			prtd->dma_addr, prtd->dsp_cnt);

		if (prtd->dsp_cnt == runtime->periods)
			prtd->dsp_cnt = 0;

		ret = afe_rt_proxy_port_write(
				(prtd->dma_addr + (prtd->dsp_cnt *
				snd_pcm_lib_period_bytes(prtd->substream))),
				mem_map_handle,
				snd_pcm_lib_period_bytes(prtd->substream));

		if (ret) {
			pr_err("%s: AFE proxy port write failed %d\n",
				__func__, ret);
			goto fail;
		}
		prtd->dsp_cnt++;
	}
fail:
	return ret;
}

static int msm_afe_capture_copy(struct snd_pcm_substream *substream,
				int channel, unsigned long hwoff,
				void __user *buf, unsigned long fbytes)
{
	int ret = 0;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct pcm_afe_info *prtd = runtime->private_data;
	char *hwbuf = runtime->dma_area + hwoff;
	u32 mem_map_handle = 0;

	if (!prtd->mmap_flag) {
		mem_map_handle = afe_req_mmap_handle(prtd->audio_client);

		if (!mem_map_handle) {
			pr_err("%s: mem_map_handle is NULL\n", __func__);
			ret = -EFAULT;
			goto fail;
		}

		if (prtd->dsp_cnt == runtime->periods)
			prtd->dsp_cnt = 0;

		ret = afe_rt_proxy_port_read((prtd->dma_addr +
				(prtd->dsp_cnt *
				snd_pcm_lib_period_bytes(prtd->substream))),
				mem_map_handle,
				snd_pcm_lib_period_bytes(prtd->substream));

		if (ret) {
			pr_err("%s: AFE proxy port read failed %d\n",
				__func__, ret);
			goto fail;
		}

		prtd->dsp_cnt++;
		ret = wait_event_timeout(prtd->read_wait,
				atomic_read(&prtd->rec_bytes_avail), 5 * HZ);
		if (ret < 0) {
			pr_err("%s: wait_event_timeout failed\n", __func__);

			ret = -ETIMEDOUT;
			goto fail;
		}
		atomic_set(&prtd->rec_bytes_avail, 0);
	}
	pr_debug("%s:appl_ptr 0x%lx hw_ptr 0x%lx src_to_copy 0x%pK\n",
			__func__, runtime->control->appl_ptr,
			runtime->status->hw_ptr, hwbuf);

	if (copy_to_user(buf, hwbuf, fbytes)) {
		pr_err("%s: copy to user failed\n", __func__);

		goto fail;
		ret = -EFAULT;
	}

fail:
	return ret;
}

static int msm_afe_copy(struct snd_pcm_substream *substream, int channel,
			unsigned long hwoff, void __user *buf,
			unsigned long fbytes)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct pcm_afe_info *prtd = runtime->private_data;

	int ret = 0;

	if (prtd->reset_event) {
		pr_debug("%s: reset events received from ADSP, return error\n",
			__func__);
		return -ENETRESET;
	}

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		ret = msm_afe_playback_copy(substream, channel, hwoff,
					buf, fbytes);
	else if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
		ret = msm_afe_capture_copy(substream, channel, hwoff,
					buf, fbytes);
	return ret;
}

static int msm_afe_close(struct snd_pcm_substream *substream)
{
	int rc = 0;
	struct snd_dma_buffer *dma_buf;
	struct snd_pcm_runtime *runtime;
	struct pcm_afe_info *prtd;
	struct snd_soc_pcm_runtime *rtd = NULL;
	struct snd_soc_dai *dai = NULL;
	int dir = IN;
	int ret = 0;

	pr_debug("%s\n", __func__);
	if (substream == NULL) {
		pr_err("substream is NULL\n");
		return -EINVAL;
	}
	rtd = substream->private_data;
	dai = rtd->cpu_dai;
	runtime = substream->runtime;
	prtd = runtime->private_data;

	mutex_lock(&prtd->lock);

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
		dir = IN;
		ret =  afe_unregister_get_events(dai->id);
		if (ret < 0)
			pr_err("AFE unregister for events failed\n");
	} else if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
		dir = OUT;
		ret =  afe_unregister_get_events(dai->id);
		if (ret < 0)
			pr_err("AFE unregister for events failed\n");
	}
	if (prtd->mmap_flag)
		hrtimer_cancel(&prtd->hrt);

	rc = afe_cmd_memory_unmap(afe_req_mmap_handle(prtd->audio_client));
	if (rc < 0)
		pr_err("AFE memory unmap failed\n");

	pr_debug("release all buffer\n");
	dma_buf = &substream->dma_buffer;
	if (dma_buf == NULL) {
		pr_debug("dma_buf is NULL\n");
			goto done;
	}

	if (dma_buf->area)
		dma_buf->area = NULL;
	q6afe_audio_client_buf_free_contiguous(dir, prtd->audio_client);
done:
	pr_debug("%s: dai->id =%x\n", __func__, dai->id);
	q6afe_audio_client_free(prtd->audio_client);
	mutex_unlock(&prtd->lock);
	prtd->prepared--;
	kfree(prtd);
	runtime->private_data = NULL;
	return 0;
}
static int msm_afe_prepare(struct snd_pcm_substream *substream)
{
	int ret = 0;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct pcm_afe_info *prtd = runtime->private_data;

	prtd->pcm_irq_pos = 0;
	if (prtd->prepared)
		return 0;
	mutex_lock(&prtd->lock);
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		ret = msm_afe_playback_prepare(substream);
	else if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
		ret = msm_afe_capture_prepare(substream);
	mutex_unlock(&prtd->lock);
	return ret;
}
static int msm_afe_mmap(struct snd_pcm_substream *substream,
				struct vm_area_struct *vma)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct pcm_afe_info *prtd = runtime->private_data;
	struct afe_audio_client *ac = prtd->audio_client;
	struct afe_audio_port_data *apd = ac->port;
	struct afe_audio_buffer *ab;
	int dir = -1;

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

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		dir = IN;
	else
		dir = OUT;
	ab = &(apd[dir].buf[0]);

	return msm_audio_ion_mmap((struct audio_buffer *)ab, vma);
}
static int msm_afe_trigger(struct snd_pcm_substream *substream, int cmd)
{
	int ret = 0;
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct pcm_afe_info *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: SNDRV_PCM_TRIGGER_START\n", __func__);
		prtd->start = 1;
		if (prtd->mmap_flag)
			hrtimer_start(&prtd->hrt, ns_to_ktime(0),
					HRTIMER_MODE_REL);
		break;
	case SNDRV_PCM_TRIGGER_STOP:
	case SNDRV_PCM_TRIGGER_SUSPEND:
	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
		pr_debug("%s: SNDRV_PCM_TRIGGER_STOP\n", __func__);
		prtd->start = 0;
		break;
	default:
		ret = -EINVAL;
		break;
	}
	return ret;
}
static int msm_afe_hw_params(struct snd_pcm_substream *substream,
				struct snd_pcm_hw_params *params)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct snd_dma_buffer *dma_buf = &substream->dma_buffer;
	struct pcm_afe_info *prtd = runtime->private_data;
	struct afe_audio_buffer *buf;
	int dir, rc;

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

	mutex_lock(&prtd->lock);
	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		dir = IN;
	else
		dir = OUT;

	rc = q6afe_audio_client_buf_alloc_contiguous(dir,
		prtd->audio_client,
		(params_buffer_bytes(params) / params_periods(params)),
		params_periods(params));
	pr_debug("params_buffer_bytes(params) = %d\n",
			(params_buffer_bytes(params)));
	pr_debug("params_periods(params) = %d\n",
			(params_periods(params)));
	pr_debug("params_periodsize(params) = %d\n",
		(params_buffer_bytes(params) / params_periods(params)));

	if (rc < 0) {
		pr_err("Audio Start: Buffer Allocation failed rc = %d\n", rc);
		mutex_unlock(&prtd->lock);
		return -ENOMEM;
	}
	buf = prtd->audio_client->port[dir].buf;

	if (buf == NULL || buf[0].data == NULL) {
		mutex_unlock(&prtd->lock);
		return -ENOMEM;
	}

	pr_debug("%s:buf = %pK\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 = params_buffer_bytes(params);

	if (!dma_buf->area) {
		pr_err("%s:MSM AFE physical memory allocation failed\n",
							__func__);
		mutex_unlock(&prtd->lock);
		return -ENOMEM;
	}

	memset(dma_buf->area, 0,  params_buffer_bytes(params));

	prtd->dma_addr = (phys_addr_t) dma_buf->addr;

	mutex_unlock(&prtd->lock);

	snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer);

	rc = afe_memory_map(dma_buf->addr, dma_buf->bytes, prtd->audio_client);
	if (rc < 0)
		pr_err("fail to map memory to DSP\n");

	return rc;
}
static snd_pcm_uframes_t msm_afe_pointer(struct snd_pcm_substream *substream)
{
	struct snd_pcm_runtime *runtime = substream->runtime;
	struct pcm_afe_info *prtd = runtime->private_data;

	if (prtd->pcm_irq_pos >= snd_pcm_lib_buffer_bytes(substream))
		prtd->pcm_irq_pos = 0;

	if (prtd->reset_event) {
		pr_debug("%s: reset events received from ADSP, return XRUN\n",
			__func__);
		return SNDRV_PCM_POS_XRUN;
	}

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

static const struct snd_pcm_ops msm_afe_ops = {
	.open           = msm_afe_open,
	.copy_user      = msm_afe_copy,
	.hw_params	= msm_afe_hw_params,
	.trigger	= msm_afe_trigger,
	.close          = msm_afe_close,
	.prepare        = msm_afe_prepare,
	.mmap		= msm_afe_mmap,
	.pointer	= msm_afe_pointer,
};


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

	pr_debug("%s\n", __func__);
	if (!card->dev->coherent_dma_mask)
		card->dev->coherent_dma_mask = DMA_BIT_MASK(32);
	return ret;
}

static int msm_afe_afe_probe(struct snd_soc_component *component)
{
	pr_debug("%s\n", __func__);
	return 0;
}

static struct snd_soc_component_driver msm_soc_component = {
	.name		= DRV_NAME,
	.ops		= &msm_afe_ops,
	.pcm_new	= msm_asoc_pcm_new,
	.probe		= msm_afe_afe_probe,
};

static int msm_afe_probe(struct platform_device *pdev)
{

	pr_debug("%s: dev name %s\n", __func__, dev_name(&pdev->dev));
	return snd_soc_register_component(&pdev->dev,
				   &msm_soc_component, NULL, 0);
}

static int msm_afe_remove(struct platform_device *pdev)
{
	pr_debug("%s\n", __func__);
	snd_soc_unregister_component(&pdev->dev);
	return 0;
}
static const struct of_device_id msm_pcm_afe_dt_match[] = {
	{.compatible = "qcom,msm-pcm-afe"},
	{}
};
MODULE_DEVICE_TABLE(of, msm_pcm_afe_dt_match);

static struct platform_driver msm_afe_driver = {
	.driver = {
		.name = "msm-pcm-afe",
		.owner = THIS_MODULE,
		.of_match_table = msm_pcm_afe_dt_match,
	},
	.probe = msm_afe_probe,
	.remove = msm_afe_remove,
};

int __init msm_pcm_afe_init(void)
{
	pr_debug("%s\n", __func__);
	return platform_driver_register(&msm_afe_driver);
}

void msm_pcm_afe_exit(void)
{
	pr_debug("%s\n", __func__);
	platform_driver_unregister(&msm_afe_driver);
}

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