ASoC: cros_ec_codec: support WoV (b6bc07d4) · Commits · 戴 / test

drivers/platform/chrome/cros_ec_trace.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -101,6 +101,7 @@
		TRACE_SYMBOL(EC_CMD_EC_CODEC), \
		TRACE_SYMBOL(EC_CMD_EC_CODEC_DMIC), \
		TRACE_SYMBOL(EC_CMD_EC_CODEC_I2S_RX), \
		TRACE_SYMBOL(EC_CMD_EC_CODEC_WOV), \
		TRACE_SYMBOL(EC_CMD_REBOOT_EC), \
		TRACE_SYMBOL(EC_CMD_GET_PANIC_INFO), \
		TRACE_SYMBOL(EC_CMD_ACPI_READ), \

include/linux/platform_data/cros_ec_commands.h

+69 −0

Original line number	Diff line number	Diff line
		@@ -556,6 +556,9 @@ enum host_event_code {
		/* Keyboard recovery combo with hardware reinitialization */
		EC_HOST_EVENT_KEYBOARD_RECOVERY_HW_REINIT = 30,

		/* WoV */
		EC_HOST_EVENT_WOV = 31,

		/*
		* The high bit of the event mask is not used as a host event code. If
		* it reads back as set, then the entire event mask should be
		@@ -4477,10 +4480,14 @@ enum ec_codec_subcmd {
		};

		enum ec_codec_cap {
		EC_CODEC_CAP_WOV_AUDIO_SHM = 0,
		EC_CODEC_CAP_WOV_LANG_SHM = 1,
		EC_CODEC_CAP_LAST = 32,
		};

		enum ec_codec_shm_id {
		EC_CODEC_SHM_ID_WOV_AUDIO = 0x0,
		EC_CODEC_SHM_ID_WOV_LANG = 0x1,
		EC_CODEC_SHM_ID_LAST,
		};

		@@ -4641,6 +4648,68 @@ struct __ec_align4 ec_param_ec_codec_i2s_rx {
		};
		};

		/*****************************************************************************/
		/* Commands for WoV on audio codec. */

		#define EC_CMD_EC_CODEC_WOV 0x00BF

		enum ec_codec_wov_subcmd {
		EC_CODEC_WOV_SET_LANG = 0x0,
		EC_CODEC_WOV_SET_LANG_SHM = 0x1,
		EC_CODEC_WOV_GET_LANG = 0x2,
		EC_CODEC_WOV_ENABLE = 0x3,
		EC_CODEC_WOV_DISABLE = 0x4,
		EC_CODEC_WOV_READ_AUDIO = 0x5,
		EC_CODEC_WOV_READ_AUDIO_SHM = 0x6,
		EC_CODEC_WOV_SUBCMD_COUNT,
		};

		/*
		* @hash is SHA256 of the whole language model.
		* @total_len indicates the length of whole language model.
		* @offset is the cursor from the beginning of the model.
		* @buf is the packet buffer.
		* @len denotes how many bytes in the buf.
		*/
		struct __ec_align4 ec_param_ec_codec_wov_set_lang {
		uint8_t hash[32];
		uint32_t total_len;
		uint32_t offset;
		uint8_t buf[128];
		uint32_t len;
		};

		struct __ec_align4 ec_param_ec_codec_wov_set_lang_shm {
		uint8_t hash[32];
		uint32_t total_len;
		};

		struct __ec_align4 ec_param_ec_codec_wov {
		uint8_t cmd; /* enum ec_codec_wov_subcmd */
		uint8_t reserved[3];

		union {
		struct ec_param_ec_codec_wov_set_lang
		set_lang_param;
		struct ec_param_ec_codec_wov_set_lang_shm
		set_lang_shm_param;
		};
		};

		struct __ec_align4 ec_response_ec_codec_wov_get_lang {
		uint8_t hash[32];
		};

		struct __ec_align4 ec_response_ec_codec_wov_read_audio {
		uint8_t buf[128];
		uint32_t len;
		};

		struct __ec_align4 ec_response_ec_codec_wov_read_audio_shm {
		uint32_t offset;
		uint32_t len;
		};

		/*****************************************************************************/
		/* System commands */

sound/soc/codecs/Kconfig

+2 −0

Original line number	Diff line number	Diff line
		@@ -509,6 +509,8 @@ config SND_SOC_CQ0093VC
		config SND_SOC_CROS_EC_CODEC
		tristate "codec driver for ChromeOS EC"
		depends on CROS_EC
		select CRYPTO
		select CRYPTO_SHA256
		help
		If you say yes here you will get support for the
		ChromeOS Embedded Controller's Audio Codec.

sound/soc/codecs/cros_ec_codec.c

+698 −2

Original line number	Diff line number	Diff line
		@@ -8,10 +8,16 @@
		* EC for audio function.
		*/

		#include <crypto/hash.h>
		#include <crypto/sha.h>
		#include <linux/delay.h>
		#include <linux/device.h>
		#include <linux/io.h>
		#include <linux/jiffies.h>
		#include <linux/kernel.h>
		#include <linux/module.h>
		#include <linux/of.h>
		#include <linux/of_address.h>
		#include <linux/platform_data/cros_ec_commands.h>
		#include <linux/platform_data/cros_ec_proto.h>
		#include <linux/platform_device.h>
		@@ -23,8 +29,45 @@
		struct cros_ec_codec_priv {
		struct device *dev;
		struct cros_ec_device *ec_device;

		/* common */
		uint32_t ec_capabilities;

		uint64_t ec_shm_addr;
		uint32_t ec_shm_len;

		uint64_t ap_shm_phys_addr;
		uint32_t ap_shm_len;
		uint64_t ap_shm_addr;
		uint64_t ap_shm_last_alloc;

		/* DMIC */
		atomic_t dmic_probed;

		/* WoV */
		bool wov_enabled;
		uint8_t *wov_audio_shm_p;
		uint32_t wov_audio_shm_len;
		uint8_t wov_audio_shm_type;
		uint8_t *wov_lang_shm_p;
		uint32_t wov_lang_shm_len;
		uint8_t wov_lang_shm_type;

		struct mutex wov_dma_lock;
		uint8_t wov_buf[64000];
		uint32_t wov_rp, wov_wp;
		size_t wov_dma_offset;
		bool wov_burst_read;
		struct snd_pcm_substream *wov_substream;
		struct delayed_work wov_copy_work;
		struct notifier_block wov_notifier;
		};

		static int ec_codec_capable(struct cros_ec_codec_priv *priv, uint8_t cap)
		{
		return priv->ec_capabilities & BIT(cap);
		}

		static int send_ec_host_command(struct cros_ec_device *ec_dev, uint32_t cmd,
		uint8_t *out, size_t outsize,
		uint8_t *in, size_t insize)
		@@ -57,6 +100,41 @@ error:
		return ret;
		}

		static int calculate_sha256(struct cros_ec_codec_priv *priv,
		uint8_t buf, uint32_t size, uint8_t digest)
		{
		struct crypto_shash *tfm;

		tfm = crypto_alloc_shash("sha256", CRYPTO_ALG_TYPE_SHASH, 0);
		if (IS_ERR(tfm)) {
		dev_err(priv->dev, "can't alloc shash\n");
		return PTR_ERR(tfm);
		}

		{
		SHASH_DESC_ON_STACK(desc, tfm);

		desc->tfm = tfm;

		crypto_shash_digest(desc, buf, size, digest);
		shash_desc_zero(desc);
		}

		crypto_free_shash(tfm);

		#ifdef DEBUG
		{
		char digest_str[65];

		bin2hex(digest_str, digest, 32);
		digest_str[64] = 0;
		dev_dbg(priv->dev, "hash=%s\n", digest_str);
		}
		#endif

		return 0;
		}

		static int dmic_get_gain(struct snd_kcontrol *kcontrol,
		struct snd_ctl_elem_value *ucontrol)
		{
		@@ -147,6 +225,9 @@ static int dmic_probe(struct snd_soc_component *component)
		struct ec_response_ec_codec_dmic_get_max_gain r;
		int ret;

		if (!atomic_add_unless(&priv->dmic_probed, 1, 1))
		return 0;

		p.cmd = EC_CODEC_DMIC_GET_MAX_GAIN;

		ret = send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_DMIC,
		@@ -324,23 +405,638 @@ static const struct snd_soc_component_driver i2s_rx_component_driver = {
		.num_dapm_routes = ARRAY_SIZE(i2s_rx_dapm_routes),
		};

		static void wov_map_shm(struct cros_ec_codec_priv priv,
		uint8_t shm_id, uint32_t len, uint8_t type)
		{
		struct ec_param_ec_codec p;
		struct ec_response_ec_codec_get_shm_addr r;
		uint32_t req, offset;

		p.cmd = EC_CODEC_GET_SHM_ADDR;
		p.get_shm_addr_param.shm_id = shm_id;
		if (send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC,
		(uint8_t *)&p, sizeof(p),
		(uint8_t *)&r, sizeof(r)) < 0) {
		dev_err(priv->dev, "failed to EC_CODEC_GET_SHM_ADDR\n");
		return NULL;
		}

		dev_dbg(priv->dev, "phys_addr=%#llx, len=%#x\n", r.phys_addr, r.len);

		*len = r.len;
		*type = r.type;

		switch (r.type) {
		case EC_CODEC_SHM_TYPE_EC_RAM:
		return (void __force *)devm_ioremap_wc(priv->dev,
		r.phys_addr + priv->ec_shm_addr, r.len);
		case EC_CODEC_SHM_TYPE_SYSTEM_RAM:
		if (r.phys_addr) {
		dev_err(priv->dev, "unknown status\n");
		return NULL;
		}

		req = round_up(r.len, PAGE_SIZE);
		dev_dbg(priv->dev, "round up from %u to %u\n", r.len, req);

		if (priv->ap_shm_last_alloc + req >
		priv->ap_shm_phys_addr + priv->ap_shm_len) {
		dev_err(priv->dev, "insufficient space for AP SHM\n");
		return NULL;
		}

		dev_dbg(priv->dev, "alloc AP SHM addr=%#llx, len=%#x\n",
		priv->ap_shm_last_alloc, req);

		p.cmd = EC_CODEC_SET_SHM_ADDR;
		p.set_shm_addr_param.phys_addr = priv->ap_shm_last_alloc;
		p.set_shm_addr_param.len = req;
		p.set_shm_addr_param.shm_id = shm_id;
		if (send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC,
		(uint8_t *)&p, sizeof(p),
		NULL, 0) < 0) {
		dev_err(priv->dev, "failed to EC_CODEC_SET_SHM_ADDR\n");
		return NULL;
		}

		/*
		* Note: EC codec only requests for `r.len' but we allocate
		* round up PAGE_SIZE `req'.
		*/
		offset = priv->ap_shm_last_alloc - priv->ap_shm_phys_addr;
		priv->ap_shm_last_alloc += req;

		return (void *)(uintptr_t)(priv->ap_shm_addr + offset);
		default:
		return NULL;
		}
		}

		static bool wov_queue_full(struct cros_ec_codec_priv *priv)
		{
		return ((priv->wov_wp + 1) % sizeof(priv->wov_buf)) == priv->wov_rp;
		}

		static size_t wov_queue_size(struct cros_ec_codec_priv *priv)
		{
		if (priv->wov_wp >= priv->wov_rp)
		return priv->wov_wp - priv->wov_rp;
		else
		return sizeof(priv->wov_buf) - priv->wov_rp + priv->wov_wp;
		}

		static void wov_queue_dequeue(struct cros_ec_codec_priv *priv, size_t len)
		{
		struct snd_pcm_runtime *runtime = priv->wov_substream->runtime;
		size_t req;

		while (len) {
		req = min(len, runtime->dma_bytes - priv->wov_dma_offset);
		if (priv->wov_wp >= priv->wov_rp)
		req = min(req, (size_t)priv->wov_wp - priv->wov_rp);
		else
		req = min(req, sizeof(priv->wov_buf) - priv->wov_rp);

		memcpy(runtime->dma_area + priv->wov_dma_offset,
		priv->wov_buf + priv->wov_rp, req);

		priv->wov_dma_offset += req;
		if (priv->wov_dma_offset == runtime->dma_bytes)
		priv->wov_dma_offset = 0;

		priv->wov_rp += req;
		if (priv->wov_rp == sizeof(priv->wov_buf))
		priv->wov_rp = 0;

		len -= req;
		}

		snd_pcm_period_elapsed(priv->wov_substream);
		}

		static void wov_queue_try_dequeue(struct cros_ec_codec_priv *priv)
		{
		size_t period_bytes = snd_pcm_lib_period_bytes(priv->wov_substream);

		while (period_bytes && wov_queue_size(priv) >= period_bytes) {
		wov_queue_dequeue(priv, period_bytes);
		period_bytes = snd_pcm_lib_period_bytes(priv->wov_substream);
		}
		}

		static void wov_queue_enqueue(struct cros_ec_codec_priv *priv,
		uint8_t *addr, size_t len, bool iomem)
		{
		size_t req;

		while (len) {
		if (wov_queue_full(priv)) {
		wov_queue_try_dequeue(priv);

		if (wov_queue_full(priv)) {
		dev_err(priv->dev, "overrun detected\n");
		return;
		}
		}

		if (priv->wov_wp >= priv->wov_rp)
		req = sizeof(priv->wov_buf) - priv->wov_wp;
		else
		/* Note: waste 1-byte to differentiate full and empty */
		req = priv->wov_rp - priv->wov_wp - 1;
		req = min(req, len);

		if (iomem)
		memcpy_fromio(priv->wov_buf + priv->wov_wp,
		(void __force __iomem *)addr, req);
		else
		memcpy(priv->wov_buf + priv->wov_wp, addr, req);

		priv->wov_wp += req;
		if (priv->wov_wp == sizeof(priv->wov_buf))
		priv->wov_wp = 0;

		addr += req;
		len -= req;
		}

		wov_queue_try_dequeue(priv);
		}

		static int wov_read_audio_shm(struct cros_ec_codec_priv *priv)
		{
		struct ec_param_ec_codec_wov p;
		struct ec_response_ec_codec_wov_read_audio_shm r;
		int ret;

		p.cmd = EC_CODEC_WOV_READ_AUDIO_SHM;
		ret = send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_WOV,
		(uint8_t *)&p, sizeof(p),
		(uint8_t *)&r, sizeof(r));
		if (ret) {
		dev_err(priv->dev, "failed to EC_CODEC_WOV_READ_AUDIO_SHM\n");
		return ret;
		}

		if (!r.len)
		dev_dbg(priv->dev, "no data, sleep\n");
		else
		wov_queue_enqueue(priv, priv->wov_audio_shm_p + r.offset, r.len,
		priv->wov_audio_shm_type == EC_CODEC_SHM_TYPE_EC_RAM);
		return -EAGAIN;
		}

		static int wov_read_audio(struct cros_ec_codec_priv *priv)
		{
		struct ec_param_ec_codec_wov p;
		struct ec_response_ec_codec_wov_read_audio r;
		int remain = priv->wov_burst_read ? 16000 : 320;
		int ret;

		while (remain >= 0) {
		p.cmd = EC_CODEC_WOV_READ_AUDIO;
		ret = send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_WOV,
		(uint8_t *)&p, sizeof(p),
		(uint8_t *)&r, sizeof(r));
		if (ret) {
		dev_err(priv->dev,
		"failed to EC_CODEC_WOV_READ_AUDIO\n");
		return ret;
		}

		if (!r.len) {
		dev_dbg(priv->dev, "no data, sleep\n");
		priv->wov_burst_read = false;
		break;
		}

		wov_queue_enqueue(priv, r.buf, r.len, false);
		remain -= r.len;
		}

		return -EAGAIN;
		}

		static void wov_copy_work(struct work_struct *w)
		{
		struct cros_ec_codec_priv *priv =
		container_of(w, struct cros_ec_codec_priv, wov_copy_work.work);
		int ret;

		mutex_lock(&priv->wov_dma_lock);
		if (!priv->wov_substream) {
		dev_warn(priv->dev, "no pcm substream\n");
		goto leave;
		}

		if (ec_codec_capable(priv, EC_CODEC_CAP_WOV_AUDIO_SHM))
		ret = wov_read_audio_shm(priv);
		else
		ret = wov_read_audio(priv);

		if (ret == -EAGAIN)
		schedule_delayed_work(&priv->wov_copy_work,
		msecs_to_jiffies(10));
		else if (ret)
		dev_err(priv->dev, "failed to read audio data\n");
		leave:
		mutex_unlock(&priv->wov_dma_lock);
		}

		static int wov_enable_get(struct snd_kcontrol *kcontrol,
		struct snd_ctl_elem_value *ucontrol)
		{
		struct snd_soc_component *c = snd_soc_kcontrol_component(kcontrol);
		struct cros_ec_codec_priv *priv = snd_soc_component_get_drvdata(c);

		ucontrol->value.integer.value[0] = priv->wov_enabled;
		return 0;
		}

		static int wov_enable_put(struct snd_kcontrol *kcontrol,
		struct snd_ctl_elem_value *ucontrol)
		{
		struct snd_soc_component *c = snd_soc_kcontrol_component(kcontrol);
		struct cros_ec_codec_priv *priv = snd_soc_component_get_drvdata(c);
		int enabled = ucontrol->value.integer.value[0];
		struct ec_param_ec_codec_wov p;
		int ret;

		if (priv->wov_enabled != enabled) {
		if (enabled)
		p.cmd = EC_CODEC_WOV_ENABLE;
		else
		p.cmd = EC_CODEC_WOV_DISABLE;

		ret = send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_WOV,
		(uint8_t *)&p, sizeof(p), NULL, 0);
		if (ret) {
		dev_err(priv->dev, "failed to %s wov\n",
		enabled ? "enable" : "disable");
		return ret;
		}

		priv->wov_enabled = enabled;
		}

		return 0;
		}

		static int wov_set_lang_shm(struct cros_ec_codec_priv *priv,
		uint8_t buf, size_t size, uint8_t digest)
		{
		struct ec_param_ec_codec_wov p;
		struct ec_param_ec_codec_wov_set_lang_shm *pp = &p.set_lang_shm_param;
		int ret;

		if (size > priv->wov_lang_shm_len) {
		dev_err(priv->dev, "no enough SHM size: %d\n",
		priv->wov_lang_shm_len);
		return -EIO;
		}

		switch (priv->wov_lang_shm_type) {
		case EC_CODEC_SHM_TYPE_EC_RAM:
		memcpy_toio((void __force __iomem *)priv->wov_lang_shm_p,
		buf, size);
		memset_io((void __force __iomem *)priv->wov_lang_shm_p + size,
		0, priv->wov_lang_shm_len - size);
		break;
		case EC_CODEC_SHM_TYPE_SYSTEM_RAM:
		memcpy(priv->wov_lang_shm_p, buf, size);
		memset(priv->wov_lang_shm_p + size, 0,
		priv->wov_lang_shm_len - size);

		/* make sure write to memory before calling host command */
		wmb();
		break;
		}

		p.cmd = EC_CODEC_WOV_SET_LANG_SHM;
		memcpy(pp->hash, digest, SHA256_DIGEST_SIZE);
		pp->total_len = size;
		ret = send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_WOV,
		(uint8_t *)&p, sizeof(p), NULL, 0);
		if (ret) {
		dev_err(priv->dev, "failed to EC_CODEC_WOV_SET_LANG_SHM\n");
		return ret;
		}

		return 0;
		}

		static int wov_set_lang(struct cros_ec_codec_priv *priv,
		uint8_t buf, size_t size, uint8_t digest)
		{
		struct ec_param_ec_codec_wov p;
		struct ec_param_ec_codec_wov_set_lang *pp = &p.set_lang_param;
		size_t i, req;
		int ret;

		for (i = 0; i < size; i += req) {
		req = min(size - i, ARRAY_SIZE(pp->buf));

		p.cmd = EC_CODEC_WOV_SET_LANG;
		memcpy(pp->hash, digest, SHA256_DIGEST_SIZE);
		pp->total_len = size;
		pp->offset = i;
		memcpy(pp->buf, buf + i, req);
		pp->len = req;
		ret = send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_WOV,
		(uint8_t *)&p, sizeof(p), NULL, 0);
		if (ret) {
		dev_err(priv->dev, "failed to EC_CODEC_WOV_SET_LANG\n");
		return ret;
		}
		}

		return 0;
		}

		static int wov_hotword_model_put(struct snd_kcontrol *kcontrol,
		const unsigned int __user *bytes,
		unsigned int size)
		{
		struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
		struct cros_ec_codec_priv *priv =
		snd_soc_component_get_drvdata(component);
		struct ec_param_ec_codec_wov p;
		struct ec_response_ec_codec_wov_get_lang r;
		uint8_t digest[SHA256_DIGEST_SIZE];
		uint8_t *buf;
		int ret;

		/* Skips the TLV header. */
		bytes += 2;
		size -= 8;

		dev_dbg(priv->dev, "%s: size=%d\n", __func__, size);

		buf = memdup_user(bytes, size);
		if (IS_ERR(buf))
		return PTR_ERR(buf);

		ret = calculate_sha256(priv, buf, size, digest);
		if (ret)
		goto leave;

		p.cmd = EC_CODEC_WOV_GET_LANG;
		ret = send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC_WOV,
		(uint8_t *)&p, sizeof(p),
		(uint8_t *)&r, sizeof(r));
		if (ret)
		goto leave;

		if (memcmp(digest, r.hash, SHA256_DIGEST_SIZE) == 0) {
		dev_dbg(priv->dev, "not updated");
		goto leave;
		}

		if (ec_codec_capable(priv, EC_CODEC_CAP_WOV_LANG_SHM))
		ret = wov_set_lang_shm(priv, buf, size, digest);
		else
		ret = wov_set_lang(priv, buf, size, digest);

		leave:
		kfree(buf);
		return ret;
		}

		static struct snd_kcontrol_new wov_controls[] = {
		SOC_SINGLE_BOOL_EXT("Wake-on-Voice Switch", 0,
		wov_enable_get, wov_enable_put),
		SND_SOC_BYTES_TLV("Hotword Model", 0x11000, NULL,
		wov_hotword_model_put),
		};

		static struct snd_soc_dai_driver wov_dai_driver = {
		.name = "Wake on Voice",
		.capture = {
		.stream_name = "WoV Capture",
		.channels_min = 1,
		.channels_max = 1,
		.rates = SNDRV_PCM_RATE_16000,
		.formats = SNDRV_PCM_FMTBIT_S16_LE,
		},
		};

		static int wov_host_event(struct notifier_block *nb,
		unsigned long queued_during_suspend, void *notify)
		{
		struct cros_ec_codec_priv *priv =
		container_of(nb, struct cros_ec_codec_priv, wov_notifier);
		u32 host_event;

		dev_dbg(priv->dev, "%s\n", __func__);

		host_event = cros_ec_get_host_event(priv->ec_device);
		if (host_event & EC_HOST_EVENT_MASK(EC_HOST_EVENT_WOV)) {
		schedule_delayed_work(&priv->wov_copy_work, 0);
		return NOTIFY_OK;
		} else {
		return NOTIFY_DONE;
		}
		}

		static int wov_probe(struct snd_soc_component *component)
		{
		struct cros_ec_codec_priv *priv =
		snd_soc_component_get_drvdata(component);
		int ret;

		mutex_init(&priv->wov_dma_lock);
		INIT_DELAYED_WORK(&priv->wov_copy_work, wov_copy_work);

		priv->wov_notifier.notifier_call = wov_host_event;
		ret = blocking_notifier_chain_register(
		&priv->ec_device->event_notifier, &priv->wov_notifier);
		if (ret)
		return ret;

		if (ec_codec_capable(priv, EC_CODEC_CAP_WOV_LANG_SHM)) {
		priv->wov_lang_shm_p = wov_map_shm(priv,
		EC_CODEC_SHM_ID_WOV_LANG,
		&priv->wov_lang_shm_len,
		&priv->wov_lang_shm_type);
		if (!priv->wov_lang_shm_p)
		return -EFAULT;
		}

		if (ec_codec_capable(priv, EC_CODEC_CAP_WOV_AUDIO_SHM)) {
		priv->wov_audio_shm_p = wov_map_shm(priv,
		EC_CODEC_SHM_ID_WOV_AUDIO,
		&priv->wov_audio_shm_len,
		&priv->wov_audio_shm_type);
		if (!priv->wov_audio_shm_p)
		return -EFAULT;
		}

		return dmic_probe(component);
		}

		static void wov_remove(struct snd_soc_component *component)
		{
		struct cros_ec_codec_priv *priv =
		snd_soc_component_get_drvdata(component);

		blocking_notifier_chain_unregister(
		&priv->ec_device->event_notifier, &priv->wov_notifier);
		}

		static int wov_pcm_open(struct snd_soc_component *component,
		struct snd_pcm_substream *substream)
		{
		static const struct snd_pcm_hardware hw_param = {
		.info = SNDRV_PCM_INFO_MMAP \|
		SNDRV_PCM_INFO_INTERLEAVED \|
		SNDRV_PCM_INFO_MMAP_VALID,
		.formats = SNDRV_PCM_FMTBIT_S16_LE,
		.rates = SNDRV_PCM_RATE_16000,
		.channels_min = 1,
		.channels_max = 1,
		.period_bytes_min = PAGE_SIZE,
		.period_bytes_max = 0x20000 / 8,
		.periods_min = 8,
		.periods_max = 8,
		.buffer_bytes_max = 0x20000,
		};

		return snd_soc_set_runtime_hwparams(substream, &hw_param);
		}

		static int wov_pcm_hw_params(struct snd_soc_component *component,
		struct snd_pcm_substream *substream,
		struct snd_pcm_hw_params *hw_params)
		{
		struct cros_ec_codec_priv *priv =
		snd_soc_component_get_drvdata(component);

		mutex_lock(&priv->wov_dma_lock);
		priv->wov_substream = substream;
		priv->wov_rp = priv->wov_wp = 0;
		priv->wov_dma_offset = 0;
		priv->wov_burst_read = true;
		mutex_unlock(&priv->wov_dma_lock);

		return snd_pcm_lib_alloc_vmalloc_buffer(substream,
		params_buffer_bytes(hw_params));
		}

		static int wov_pcm_hw_free(struct snd_soc_component *component,
		struct snd_pcm_substream *substream)
		{
		struct cros_ec_codec_priv *priv =
		snd_soc_component_get_drvdata(component);

		mutex_lock(&priv->wov_dma_lock);
		wov_queue_dequeue(priv, wov_queue_size(priv));
		priv->wov_substream = NULL;
		mutex_unlock(&priv->wov_dma_lock);

		cancel_delayed_work_sync(&priv->wov_copy_work);

		return snd_pcm_lib_free_vmalloc_buffer(substream);
		}

		static snd_pcm_uframes_t wov_pcm_pointer(struct snd_soc_component *component,
		struct snd_pcm_substream *substream)
		{
		struct snd_pcm_runtime *runtime = substream->runtime;
		struct cros_ec_codec_priv *priv =
		snd_soc_component_get_drvdata(component);

		return bytes_to_frames(runtime, priv->wov_dma_offset);
		}

		static struct page wov_pcm_page(struct snd_soc_component component,
		struct snd_pcm_substream *substream,
		unsigned long offset)
		{
		return snd_pcm_lib_get_vmalloc_page(substream, offset);
		}

		static const struct snd_soc_component_driver wov_component_driver = {
		.probe = wov_probe,
		.remove = wov_remove,
		.controls = wov_controls,
		.num_controls = ARRAY_SIZE(wov_controls),
		.open = wov_pcm_open,
		.hw_params = wov_pcm_hw_params,
		.hw_free = wov_pcm_hw_free,
		.pointer = wov_pcm_pointer,
		.page = wov_pcm_page,
		};

		static int cros_ec_codec_platform_probe(struct platform_device *pdev)
		{
		struct device *dev = &pdev->dev;
		struct cros_ec_device *ec_device = dev_get_drvdata(pdev->dev.parent);
		struct cros_ec_codec_priv *priv;
		struct ec_param_ec_codec p;
		struct ec_response_ec_codec_get_capabilities r;
		int ret;
		#ifdef CONFIG_OF
		struct device_node *node;
		struct resource res;
		u64 ec_shm_size;
		const __be32 *regaddr_p;
		#endif

		priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
		if (!priv)
		return -ENOMEM;

		#ifdef CONFIG_OF
		regaddr_p = of_get_address(dev->of_node, 0, &ec_shm_size, NULL);
		if (regaddr_p) {
		priv->ec_shm_addr = of_read_number(regaddr_p, 2);
		priv->ec_shm_len = ec_shm_size;

		dev_dbg(dev, "ec_shm_addr=%#llx len=%#x\n",
		priv->ec_shm_addr, priv->ec_shm_len);
		}

		node = of_parse_phandle(dev->of_node, "memory-region", 0);
		if (node) {
		ret = of_address_to_resource(node, 0, &res);
		if (!ret) {
		priv->ap_shm_phys_addr = res.start;
		priv->ap_shm_len = resource_size(&res);
		priv->ap_shm_addr =
		(uint64_t)(uintptr_t)devm_ioremap_wc(
		dev, priv->ap_shm_phys_addr,
		priv->ap_shm_len);
		priv->ap_shm_last_alloc = priv->ap_shm_phys_addr;

		dev_dbg(dev, "ap_shm_phys_addr=%#llx len=%#x\n",
		priv->ap_shm_phys_addr, priv->ap_shm_len);
		}
		}
		#endif

		priv->dev = dev;
		priv->ec_device = ec_device;
		atomic_set(&priv->dmic_probed, 0);

		p.cmd = EC_CODEC_GET_CAPABILITIES;
		ret = send_ec_host_command(priv->ec_device, EC_CMD_EC_CODEC,
		(uint8_t *)&p, sizeof(p),
		(uint8_t *)&r, sizeof(r));
		if (ret) {
		dev_err(dev, "failed to EC_CODEC_GET_CAPABILITIES\n");
		return ret;
		}
		priv->ec_capabilities = r.capabilities;

		platform_set_drvdata(pdev, priv);

		return devm_snd_soc_register_component(dev, &i2s_rx_component_driver,
		ret = devm_snd_soc_register_component(dev, &i2s_rx_component_driver,
		&i2s_rx_dai_driver, 1);
		if (ret)
		return ret;

		return devm_snd_soc_register_component(dev, &wov_component_driver,
		&wov_dai_driver, 1);
		}

		#ifdef CONFIG_OF

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