ASoC: mediatek: add btcvsd driver

The driver function for transferring/receiving
BT encoded data to/from BT firmware.
Signed-off-by: KaiChieh Chuang <kaichieh.chuang@mediatek.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/mediatek/Kconfig

@@ -115,3 +115,12 @@ config SND_SOC_MT8183
 	  that can be used with other codecs.
 	  Select Y if you have such device.
 	  If unsure select "N".
+
+config SND_SOC_MTK_BTCVSD
+	tristate "ALSA BT SCO CVSD/MSBC Driver"
+	help
+	  This is for software BTCVSD. This enable
+	  the function for transferring/receiving
+	  BT encoded data to/from BT firmware.
+	  Select Y if you have such device.
+	  If unsure select "N".

sound/soc/mediatek/common/Makefile

@@ -2,3 +2,5 @@
 # platform driver
 snd-soc-mtk-common-objs := mtk-afe-platform-driver.o mtk-afe-fe-dai.o
 obj-$(CONFIG_SND_SOC_MEDIATEK) += snd-soc-mtk-common.o
+
+obj-$(CONFIG_SND_SOC_MTK_BTCVSD) += mtk-btcvsd.o
\ No newline at end of file

sound/soc/mediatek/common/mtk-btcvsd.c

+// SPDX-License-Identifier: GPL-2.0
+//
+// Mediatek ALSA BT SCO CVSD/MSBC Driver
+//
+// Copyright (c) 2019 MediaTek Inc.
+// Author: KaiChieh Chuang <kaichieh.chuang@mediatek.com>
+
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/sched/clock.h>
+
+#include <sound/soc.h>
+
+#define BTCVSD_SND_NAME "mtk-btcvsd-snd"
+
+#define BT_CVSD_TX_NREADY	BIT(21)
+#define BT_CVSD_RX_READY	BIT(22)
+#define BT_CVSD_TX_UNDERFLOW	BIT(23)
+#define BT_CVSD_RX_OVERFLOW	BIT(24)
+#define BT_CVSD_INTERRUPT	BIT(31)
+
+#define BT_CVSD_CLEAR \
+	(BT_CVSD_TX_NREADY | BT_CVSD_RX_READY | BT_CVSD_TX_UNDERFLOW |\
+	 BT_CVSD_RX_OVERFLOW | BT_CVSD_INTERRUPT)
+
+/* TX */
+#define SCO_TX_ENCODE_SIZE (60)
+/* 18 = 6 * 180 / SCO_TX_ENCODE_SIZE */
+#define SCO_TX_PACKER_BUF_NUM (18)
+
+/* RX */
+#define SCO_RX_PLC_SIZE (30)
+#define SCO_RX_PACKER_BUF_NUM (64)
+#define SCO_RX_PACKET_MASK (0x3F)
+
+#define SCO_CVSD_PACKET_VALID_SIZE 2
+
+#define SCO_PACKET_120 120
+#define SCO_PACKET_180 180
+
+#define BTCVSD_RX_PACKET_SIZE (SCO_RX_PLC_SIZE + SCO_CVSD_PACKET_VALID_SIZE)
+#define BTCVSD_TX_PACKET_SIZE (SCO_TX_ENCODE_SIZE)
+
+#define BTCVSD_RX_BUF_SIZE (BTCVSD_RX_PACKET_SIZE * SCO_RX_PACKER_BUF_NUM)
+#define BTCVSD_TX_BUF_SIZE (BTCVSD_TX_PACKET_SIZE * SCO_TX_PACKER_BUF_NUM)
+
+enum bt_sco_state {
+	BT_SCO_STATE_IDLE,
+	BT_SCO_STATE_RUNNING,
+	BT_SCO_STATE_ENDING,
+};
+
+enum bt_sco_direct {
+	BT_SCO_DIRECT_BT2ARM,
+	BT_SCO_DIRECT_ARM2BT,
+};
+
+enum bt_sco_packet_len {
+	BT_SCO_CVSD_30 = 0,
+	BT_SCO_CVSD_60,
+	BT_SCO_CVSD_90,
+	BT_SCO_CVSD_120,
+	BT_SCO_CVSD_10,
+	BT_SCO_CVSD_20,
+	BT_SCO_CVSD_MAX,
+};
+
+enum BT_SCO_BAND {
+	BT_SCO_NB,
+	BT_SCO_WB,
+};
+
+struct mtk_btcvsd_snd_hw_info {
+	unsigned int num_valid_addr;
+	unsigned long bt_sram_addr[20];
+	unsigned int packet_length;
+	unsigned int packet_num;
+};
+
+struct mtk_btcvsd_snd_stream {
+	struct snd_pcm_substream *substream;
+	int stream;
+
+	enum bt_sco_state state;
+
+	unsigned int packet_size;
+	unsigned int buf_size;
+	u8 temp_packet_buf[SCO_PACKET_180];
+
+	int packet_w;
+	int packet_r;
+	snd_pcm_uframes_t prev_frame;
+	int prev_packet_idx;
+
+	unsigned int xrun:1;
+	unsigned int timeout:1;
+	unsigned int mute:1;
+	unsigned int trigger_start:1;
+	unsigned int wait_flag:1;
+	unsigned int rw_cnt;
+
+	unsigned long long time_stamp;
+	unsigned long long buf_data_equivalent_time;
+
+	struct mtk_btcvsd_snd_hw_info buffer_info;
+};
+
+struct mtk_btcvsd_snd {
+	struct device *dev;
+	int irq_id;
+
+	struct regmap *infra;
+	void __iomem *bt_pkv_base;
+	void __iomem *bt_sram_bank2_base;
+
+	unsigned int infra_misc_offset;
+	unsigned int conn_bt_cvsd_mask;
+	unsigned int cvsd_mcu_read_offset;
+	unsigned int cvsd_mcu_write_offset;
+	unsigned int cvsd_packet_indicator;
+
+	u32 *bt_reg_pkt_r;
+	u32 *bt_reg_pkt_w;
+	u32 *bt_reg_ctl;
+
+	unsigned int irq_disabled:1;
+
+	spinlock_t tx_lock;	/* spinlock for bt tx stream control */
+	spinlock_t rx_lock;	/* spinlock for bt rx stream control */
+	wait_queue_head_t tx_wait;
+	wait_queue_head_t rx_wait;
+
+	struct mtk_btcvsd_snd_stream *tx;
+	struct mtk_btcvsd_snd_stream *rx;
+	u8 tx_packet_buf[BTCVSD_TX_BUF_SIZE];
+	u8 rx_packet_buf[BTCVSD_RX_BUF_SIZE];
+
+	enum BT_SCO_BAND band;
+};
+
+struct mtk_btcvsd_snd_time_buffer_info {
+	unsigned long long data_count_equi_time;
+	unsigned long long time_stamp_us;
+};
+
+static const unsigned int btsco_packet_valid_mask[BT_SCO_CVSD_MAX][6] = {
+	{0x1, 0x1 << 1, 0x1 << 2, 0x1 << 3, 0x1 << 4, 0x1 << 5},
+	{0x1, 0x1, 0x2, 0x2, 0x4, 0x4},
+	{0x1, 0x1, 0x1, 0x2, 0x2, 0x2},
+	{0x1, 0x1, 0x1, 0x1, 0x0, 0x0},
+	{0x7, 0x7 << 3, 0x7 << 6, 0x7 << 9, 0x7 << 12, 0x7 << 15},
+	{0x3, 0x3 << 1, 0x3 << 3, 0x3 << 4, 0x3 << 6, 0x3 << 7},
+};
+
+static const unsigned int btsco_packet_info[BT_SCO_CVSD_MAX][4] = {
+	{30, 6, SCO_PACKET_180 / SCO_TX_ENCODE_SIZE,
+	 SCO_PACKET_180 / SCO_RX_PLC_SIZE},
+	{60, 3, SCO_PACKET_180 / SCO_TX_ENCODE_SIZE,
+	 SCO_PACKET_180 / SCO_RX_PLC_SIZE},
+	{90, 2, SCO_PACKET_180 / SCO_TX_ENCODE_SIZE,
+	 SCO_PACKET_180 / SCO_RX_PLC_SIZE},
+	{120, 1, SCO_PACKET_120 / SCO_TX_ENCODE_SIZE,
+	 SCO_PACKET_120 / SCO_RX_PLC_SIZE},
+	{10, 18, SCO_PACKET_180 / SCO_TX_ENCODE_SIZE,
+	 SCO_PACKET_180 / SCO_RX_PLC_SIZE},
+	{20, 9, SCO_PACKET_180 / SCO_TX_ENCODE_SIZE,
+	 SCO_PACKET_180 / SCO_RX_PLC_SIZE},
+};
+
+static const u8 table_msbc_silence[SCO_PACKET_180] = {
+	0x01, 0x38, 0xad, 0x00, 0x00, 0xc5, 0x00, 0x00, 0x00, 0x00,
+	0x77, 0x6d, 0xb6, 0xdd, 0xdb, 0x6d, 0xb7, 0x76, 0xdb, 0x6d,
+	0xdd, 0xb6, 0xdb, 0x77, 0x6d, 0xb6, 0xdd, 0xdb, 0x6d, 0xb7,
+	0x76, 0xdb, 0x6d, 0xdd, 0xb6, 0xdb, 0x77, 0x6d, 0xb6, 0xdd,
+	0xdb, 0x6d, 0xb7, 0x76, 0xdb, 0x6d, 0xdd, 0xb6, 0xdb, 0x77,
+	0x6d, 0xb6, 0xdd, 0xdb, 0x6d, 0xb7, 0x76, 0xdb, 0x6c, 0x00,
+	0x01, 0xc8, 0xad, 0x00, 0x00, 0xc5, 0x00, 0x00, 0x00, 0x00,
+	0x77, 0x6d, 0xb6, 0xdd, 0xdb, 0x6d, 0xb7, 0x76, 0xdb, 0x6d,
+	0xdd, 0xb6, 0xdb, 0x77, 0x6d, 0xb6, 0xdd, 0xdb, 0x6d, 0xb7,
+	0x76, 0xdb, 0x6d, 0xdd, 0xb6, 0xdb, 0x77, 0x6d, 0xb6, 0xdd,
+	0xdb, 0x6d, 0xb7, 0x76, 0xdb, 0x6d, 0xdd, 0xb6, 0xdb, 0x77,
+	0x6d, 0xb6, 0xdd, 0xdb, 0x6d, 0xb7, 0x76, 0xdb, 0x6c, 0x00,
+	0x01, 0xf8, 0xad, 0x00, 0x00, 0xc5, 0x00, 0x00, 0x00, 0x00,
+	0x77, 0x6d, 0xb6, 0xdd, 0xdb, 0x6d, 0xb7, 0x76, 0xdb, 0x6d,
+	0xdd, 0xb6, 0xdb, 0x77, 0x6d, 0xb6, 0xdd, 0xdb, 0x6d, 0xb7,
+	0x76, 0xdb, 0x6d, 0xdd, 0xb6, 0xdb, 0x77, 0x6d, 0xb6, 0xdd,
+	0xdb, 0x6d, 0xb7, 0x76, 0xdb, 0x6d, 0xdd, 0xb6, 0xdb, 0x77,
+	0x6d, 0xb6, 0xdd, 0xdb, 0x6d, 0xb7, 0x76, 0xdb, 0x6c, 0x00
+};
+
+static void mtk_btcvsd_snd_irq_enable(struct mtk_btcvsd_snd *bt)
+{
+	regmap_update_bits(bt->infra, bt->infra_misc_offset,
+			   bt->conn_bt_cvsd_mask, bt->conn_bt_cvsd_mask);
+}
+
+static void mtk_btcvsd_snd_irq_disable(struct mtk_btcvsd_snd *bt)
+{
+	regmap_update_bits(bt->infra, bt->infra_misc_offset,
+			   bt->conn_bt_cvsd_mask, 0);
+}
+
+static void mtk_btcvsd_snd_set_state(struct mtk_btcvsd_snd *bt,
+				     struct mtk_btcvsd_snd_stream *bt_stream,
+				     int state)
+{
+	dev_dbg(bt->dev, "%s(), stream %d, state %d, tx->state %d, rx->state %d, irq_disabled %d\n",
+		__func__,
+		bt_stream->stream, state,
+		bt->tx->state, bt->rx->state, bt->irq_disabled);
+
+	bt_stream->state = state;
+
+	if (bt->tx->state == BT_SCO_STATE_IDLE &&
+	    bt->rx->state == BT_SCO_STATE_IDLE) {
+		if (!bt->irq_disabled) {
+			disable_irq(bt->irq_id);
+			mtk_btcvsd_snd_irq_disable(bt);
+			bt->irq_disabled = 1;
+		}
+	} else {
+		if (bt->irq_disabled) {
+			enable_irq(bt->irq_id);
+			mtk_btcvsd_snd_irq_enable(bt);
+			bt->irq_disabled = 0;
+		}
+	}
+}
+
+static int mtk_btcvsd_snd_tx_init(struct mtk_btcvsd_snd *bt)
+{
+	memset(bt->tx, 0, sizeof(*bt->tx));
+	memset(bt->tx_packet_buf, 0, sizeof(bt->tx_packet_buf));
+
+	bt->tx->packet_size = BTCVSD_TX_PACKET_SIZE;
+	bt->tx->buf_size = BTCVSD_TX_BUF_SIZE;
+	bt->tx->timeout = 0;
+	bt->tx->rw_cnt = 0;
+	bt->tx->stream = SNDRV_PCM_STREAM_PLAYBACK;
+	return 0;
+}
+
+static int mtk_btcvsd_snd_rx_init(struct mtk_btcvsd_snd *bt)
+{
+	memset(bt->rx, 0, sizeof(*bt->rx));
+	memset(bt->rx_packet_buf, 0, sizeof(bt->rx_packet_buf));
+
+	bt->rx->packet_size = BTCVSD_RX_PACKET_SIZE;
+	bt->rx->buf_size = BTCVSD_RX_BUF_SIZE;
+	bt->rx->timeout = 0;
+	bt->rx->rw_cnt = 0;
+	bt->tx->stream = SNDRV_PCM_STREAM_CAPTURE;
+	return 0;
+}
+
+static void get_tx_time_stamp(struct mtk_btcvsd_snd *bt,
+			      struct mtk_btcvsd_snd_time_buffer_info *ts)
+{
+	ts->time_stamp_us = bt->tx->time_stamp;
+	ts->data_count_equi_time = bt->tx->buf_data_equivalent_time;
+}
+
+static void get_rx_time_stamp(struct mtk_btcvsd_snd *bt,
+			      struct mtk_btcvsd_snd_time_buffer_info *ts)
+{
+	ts->time_stamp_us = bt->rx->time_stamp;
+	ts->data_count_equi_time = bt->rx->buf_data_equivalent_time;
+}
+
+static int btcvsd_bytes_to_frame(struct snd_pcm_substream *substream,
+				 int bytes)
+{
+	int count = bytes;
+	struct snd_pcm_runtime *runtime = substream->runtime;
+
+	if (runtime->format == SNDRV_PCM_FORMAT_S32_LE ||
+	    runtime->format == SNDRV_PCM_FORMAT_U32_LE)
+		count = count >> 2;
+	else
+		count = count >> 1;
+
+	count = count / runtime->channels;
+	return count;
+}
+
+static void mtk_btcvsd_snd_data_transfer(enum bt_sco_direct dir,
+					 u8 *src, u8 *dst,
+					 unsigned int blk_size,
+					 unsigned int blk_num)
+{
+	unsigned int i, j;
+
+	if (blk_size == 60 || blk_size == 120 || blk_size == 20) {
+		u32 *src_32 = (u32 *)src;
+		u32 *dst_32 = (u32 *)dst;
+
+		for (i = 0; i < (blk_size * blk_num / 4); i++)
+			*dst_32++ = *src_32++;
+	} else {
+		u16 *src_16 = (u16 *)src;
+		u16 *dst_16 = (u16 *)dst;
+
+		for (j = 0; j < blk_num; j++) {
+			for (i = 0; i < (blk_size / 2); i++)
+				*dst_16++ = *src_16++;
+
+			if (dir == BT_SCO_DIRECT_BT2ARM)
+				src_16++;
+			else
+				dst_16++;
+		}
+	}
+}
+
+/* write encoded mute data to bt sram */
+static int btcvsd_tx_clean_buffer(struct mtk_btcvsd_snd *bt)
+{
+	unsigned int i;
+	unsigned int num_valid_addr;
+	unsigned long flags;
+	enum BT_SCO_BAND band = bt->band;
+
+	/* prepare encoded mute data */
+	if (band == BT_SCO_NB)
+		memset(bt->tx->temp_packet_buf, 170, SCO_PACKET_180);
+	else
+		memcpy(bt->tx->temp_packet_buf,
+		       table_msbc_silence, SCO_PACKET_180);
+
+	/* write mute data to bt tx sram buffer */
+	spin_lock_irqsave(&bt->tx_lock, flags);
+	num_valid_addr = bt->tx->buffer_info.num_valid_addr;
+
+	dev_info(bt->dev, "%s(), band %d, num_valid_addr %u\n",
+		 __func__, band, num_valid_addr);
+
+	for (i = 0; i < num_valid_addr; i++) {
+		void *dst;
+
+		dev_info(bt->dev, "%s(), clean addr 0x%lx\n", __func__,
+			 bt->tx->buffer_info.bt_sram_addr[i]);
+
+		dst = (void *)bt->tx->buffer_info.bt_sram_addr[i];
+
+		mtk_btcvsd_snd_data_transfer(BT_SCO_DIRECT_ARM2BT,
+					     bt->tx->temp_packet_buf, dst,
+					     bt->tx->buffer_info.packet_length,
+					     bt->tx->buffer_info.packet_num);
+	}
+	spin_unlock_irqrestore(&bt->tx_lock, flags);
+
+	return 0;
+}
+
+static int mtk_btcvsd_read_from_bt(struct mtk_btcvsd_snd *bt,
+				   enum bt_sco_packet_len packet_type,
+				   unsigned int packet_length,
+				   unsigned int packet_num,
+				   unsigned int blk_size,
+				   unsigned int control)
+{
+	unsigned int i;
+	int pv;
+	u8 *src;
+	unsigned int packet_buf_ofs;
+	unsigned long flags;
+	unsigned long connsys_addr_rx, ap_addr_rx;
+
+	connsys_addr_rx = *bt->bt_reg_pkt_r;
+	ap_addr_rx = (unsigned long)bt->bt_sram_bank2_base +
+		     (connsys_addr_rx & 0xFFFF);
+
+	if (connsys_addr_rx == 0xdeadfeed) {
+		/* bt return 0xdeadfeed if read register during bt sleep */
+		dev_warn(bt->dev, "%s(), connsys_addr_rx == 0xdeadfeed",
+			 __func__);
+		return -EIO;
+	}
+
+	src = (u8 *)ap_addr_rx;
+
+	mtk_btcvsd_snd_data_transfer(BT_SCO_DIRECT_BT2ARM, src,
+				     bt->rx->temp_packet_buf, packet_length,
+				     packet_num);
+
+	spin_lock_irqsave(&bt->rx_lock, flags);
+	for (i = 0; i < blk_size; i++) {
+		packet_buf_ofs = (bt->rx->packet_w & SCO_RX_PACKET_MASK) *
+				 bt->rx->packet_size;
+		memcpy(bt->rx_packet_buf + packet_buf_ofs,
+		       bt->rx->temp_packet_buf + (SCO_RX_PLC_SIZE * i),
+		       SCO_RX_PLC_SIZE);
+		if ((control & btsco_packet_valid_mask[packet_type][i]) ==
+		    btsco_packet_valid_mask[packet_type][i])
+			pv = 1;
+		else
+			pv = 0;
+
+		packet_buf_ofs += SCO_RX_PLC_SIZE;
+		memcpy(bt->rx_packet_buf + packet_buf_ofs, (void *)&pv,
+		       SCO_CVSD_PACKET_VALID_SIZE);
+		bt->rx->packet_w++;
+	}
+	spin_unlock_irqrestore(&bt->rx_lock, flags);
+	return 0;
+}
+
+int mtk_btcvsd_write_to_bt(struct mtk_btcvsd_snd *bt,
+			   enum bt_sco_packet_len packet_type,
+			   unsigned int packet_length,
+			   unsigned int packet_num,
+			   unsigned int blk_size)
+{
+	unsigned int i;
+	unsigned long flags;
+	u8 *dst;
+	unsigned long connsys_addr_tx, ap_addr_tx;
+	bool new_ap_addr_tx = true;
+
+	connsys_addr_tx = *bt->bt_reg_pkt_w;
+	ap_addr_tx = (unsigned long)bt->bt_sram_bank2_base +
+		     (connsys_addr_tx & 0xFFFF);
+
+	if (connsys_addr_tx == 0xdeadfeed) {
+		/* bt return 0xdeadfeed if read register during bt sleep */
+		dev_warn(bt->dev, "%s(), connsys_addr_tx == 0xdeadfeed\n",
+			 __func__);
+		return -EIO;
+	}
+
+	spin_lock_irqsave(&bt->tx_lock, flags);
+	for (i = 0; i < blk_size; i++) {
+		memcpy(bt->tx->temp_packet_buf + (bt->tx->packet_size * i),
+		       (bt->tx_packet_buf +
+			(bt->tx->packet_r % SCO_TX_PACKER_BUF_NUM) *
+			bt->tx->packet_size),
+		       bt->tx->packet_size);
+
+		bt->tx->packet_r++;
+	}
+	spin_unlock_irqrestore(&bt->tx_lock, flags);
+
+	dst = (u8 *)ap_addr_tx;
+
+	if (!bt->tx->mute) {
+		mtk_btcvsd_snd_data_transfer(BT_SCO_DIRECT_ARM2BT,
+					     bt->tx->temp_packet_buf, dst,
+					     packet_length, packet_num);
+	}
+
+	/* store bt tx buffer sram info */
+	bt->tx->buffer_info.packet_length = packet_length;
+	bt->tx->buffer_info.packet_num = packet_num;
+	for (i = 0; i < bt->tx->buffer_info.num_valid_addr; i++) {
+		if (bt->tx->buffer_info.bt_sram_addr[i] == ap_addr_tx) {
+			new_ap_addr_tx = false;
+			break;
+		}
+	}
+	if (new_ap_addr_tx) {
+		unsigned int next_idx;
+
+		spin_lock_irqsave(&bt->tx_lock, flags);
+		bt->tx->buffer_info.num_valid_addr++;
+		next_idx = bt->tx->buffer_info.num_valid_addr - 1;
+		bt->tx->buffer_info.bt_sram_addr[next_idx] = ap_addr_tx;
+		spin_unlock_irqrestore(&bt->tx_lock, flags);
+		dev_info(bt->dev, "%s(), new ap_addr_tx = 0x%lx, num_valid_addr %d\n",
+			 __func__, ap_addr_tx,
+			 bt->tx->buffer_info.num_valid_addr);
+	}
+
+	if (bt->tx->mute)
+		btcvsd_tx_clean_buffer(bt);
+
+	return 0;
+}
+
+static irqreturn_t mtk_btcvsd_snd_irq_handler(int irq_id, void *dev)
+{
+	struct mtk_btcvsd_snd *bt = dev;
+	unsigned int packet_type, packet_num, packet_length;
+	unsigned int buf_cnt_tx, buf_cnt_rx, control;
+
+	if (bt->rx->state != BT_SCO_STATE_RUNNING &&
+	    bt->rx->state != BT_SCO_STATE_ENDING &&
+	    bt->tx->state != BT_SCO_STATE_RUNNING &&
+	    bt->tx->state != BT_SCO_STATE_ENDING) {
+		dev_warn(bt->dev, "%s(), in idle state: rx->state: %d, tx->state: %d\n",
+			 __func__, bt->rx->state, bt->tx->state);
+		goto irq_handler_exit;
+	}
+
+	control = *bt->bt_reg_ctl;
+	packet_type = (control >> 18) & 0x7;
+
+	if (((control >> 31) & 1) == 0) {
+		dev_warn(bt->dev, "%s(), ((control >> 31) & 1) == 0, control 0x%x\n",
+			 __func__, control);
+		goto irq_handler_exit;
+	}
+
+	if (packet_type >= BT_SCO_CVSD_MAX) {
+		dev_warn(bt->dev, "%s(), invalid packet_type %u, exit\n",
+			 __func__, packet_type);
+		goto irq_handler_exit;
+	}
+
+	packet_length = btsco_packet_info[packet_type][0];
+	packet_num = btsco_packet_info[packet_type][1];
+	buf_cnt_tx = btsco_packet_info[packet_type][2];
+	buf_cnt_rx = btsco_packet_info[packet_type][3];
+
+	if (bt->rx->state == BT_SCO_STATE_RUNNING ||
+	    bt->rx->state == BT_SCO_STATE_ENDING) {
+		if (bt->rx->xrun) {
+			if (bt->rx->packet_w - bt->rx->packet_r <=
+			    SCO_RX_PACKER_BUF_NUM - 2 * buf_cnt_rx) {
+				/*
+				 * free space is larger then
+				 * twice interrupt rx data size
+				 */
+				bt->rx->xrun = 0;
+				dev_warn(bt->dev, "%s(), rx->xrun 0!\n",
+					 __func__);
+			}
+		}
+
+		if (!bt->rx->xrun &&
+		    (bt->rx->packet_w - bt->rx->packet_r <=
+		     SCO_RX_PACKER_BUF_NUM - buf_cnt_rx)) {
+			mtk_btcvsd_read_from_bt(bt,
+						packet_type,
+						packet_length,
+						packet_num,
+						buf_cnt_rx,
+						control);
+			bt->rx->rw_cnt++;
+		} else {
+			bt->rx->xrun = 1;
+			dev_warn(bt->dev, "%s(), rx->xrun 1\n", __func__);
+		}
+	}
+
+	/* tx */
+	bt->tx->timeout = 0;
+	if ((bt->tx->state == BT_SCO_STATE_RUNNING ||
+	     bt->tx->state == BT_SCO_STATE_ENDING) &&
+	    bt->tx->trigger_start) {
+		if (bt->tx->xrun) {
+			/* prepared data is larger then twice
+			 * interrupt tx data size
+			 */
+			if (bt->tx->packet_w - bt->tx->packet_r >=
+			    2 * buf_cnt_tx) {
+				bt->tx->xrun = 0;
+				dev_warn(bt->dev, "%s(), tx->xrun 0\n",
+					 __func__);
+			}
+		}
+
+		if ((!bt->tx->xrun &&
+		     (bt->tx->packet_w - bt->tx->packet_r >= buf_cnt_tx)) ||
+		    bt->tx->state == BT_SCO_STATE_ENDING) {
+			mtk_btcvsd_write_to_bt(bt,
+					       packet_type,
+					       packet_length,
+					       packet_num,
+					       buf_cnt_tx);
+			bt->tx->rw_cnt++;
+		} else {
+			bt->tx->xrun = 1;
+			dev_warn(bt->dev, "%s(), tx->xrun 1\n", __func__);
+		}
+	}
+
+	*bt->bt_reg_ctl &= ~BT_CVSD_CLEAR;
+
+	if (bt->rx->state == BT_SCO_STATE_RUNNING ||
+	    bt->rx->state == BT_SCO_STATE_ENDING) {
+		bt->rx->wait_flag = 1;
+		wake_up_interruptible(&bt->rx_wait);
+		snd_pcm_period_elapsed(bt->rx->substream);
+	}
+	if (bt->tx->state == BT_SCO_STATE_RUNNING ||
+	    bt->tx->state == BT_SCO_STATE_ENDING) {
+		bt->tx->wait_flag = 1;
+		wake_up_interruptible(&bt->tx_wait);
+		snd_pcm_period_elapsed(bt->tx->substream);
+	}
+
+	return IRQ_HANDLED;
+irq_handler_exit:
+	*bt->bt_reg_ctl &= ~BT_CVSD_CLEAR;
+	return IRQ_HANDLED;
+}
+
+static int wait_for_bt_irq(struct mtk_btcvsd_snd *bt,
+			   struct mtk_btcvsd_snd_stream *bt_stream)
+{
+	unsigned long long t1, t2;
+	/* one interrupt period = 22.5ms */
+	unsigned long long timeout_limit = 22500000;
+	int max_timeout_trial = 2;
+	int ret;
+
+	bt_stream->wait_flag = 0;
+
+	while (max_timeout_trial && !bt_stream->wait_flag) {
+		t1 = sched_clock();
+		if (bt_stream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+			ret = wait_event_interruptible_timeout(bt->tx_wait,
+				bt_stream->wait_flag,
+				nsecs_to_jiffies(timeout_limit));
+		} else {
+			ret = wait_event_interruptible_timeout(bt->rx_wait,
+				bt_stream->wait_flag,
+				nsecs_to_jiffies(timeout_limit));
+		}
+
+		t2 = sched_clock();
+		t2 = t2 - t1; /* in ns (10^9) */
+
+		if (t2 > timeout_limit) {
+			dev_warn(bt->dev, "%s(), stream %d, timeout %llu, limit %llu, ret %d, flag %d\n",
+				 __func__, bt_stream->stream,
+				 t2, timeout_limit, ret,
+				 bt_stream->wait_flag);
+		}
+
+		if (ret < 0) {
+			/*
+			 * error, -ERESTARTSYS if it was interrupted by
+			 * a signal
+			 */
+			dev_warn(bt->dev, "%s(), stream %d, error, trial left %d\n",
+				 __func__,
+				 bt_stream->stream, max_timeout_trial);
+
+			bt_stream->timeout = 1;
+			return ret;
+		} else if (ret == 0) {
+			/* conidtion is false after timeout */
+			max_timeout_trial--;
+			dev_warn(bt->dev, "%s(), stream %d, error, timeout, condition is false, trial left %d\n",
+				 __func__,
+				 bt_stream->stream, max_timeout_trial);
+
+			if (max_timeout_trial <= 0) {
+				bt_stream->timeout = 1;
+				return -ETIME;
+			}
+		}
+	}
+
+	return 0;
+}
+
+ssize_t mtk_btcvsd_snd_read(struct mtk_btcvsd_snd *bt,
+			    char __user *buf,
+			    size_t count)
+{
+	ssize_t read_size = 0, read_count = 0, cur_read_idx, cont;
+	unsigned int cur_buf_ofs = 0;
+	unsigned long avail;
+	unsigned long flags;
+	unsigned int packet_size = bt->rx->packet_size;
+
+	while (count) {
+		spin_lock_irqsave(&bt->rx_lock, flags);
+		/* available data in RX packet buffer */
+		avail = (bt->rx->packet_w - bt->rx->packet_r) * packet_size;
+
+		cur_read_idx = (bt->rx->packet_r & SCO_RX_PACKET_MASK) *
+			       packet_size;
+		spin_unlock_irqrestore(&bt->rx_lock, flags);
+
+		if (!avail) {
+			int ret = wait_for_bt_irq(bt, bt->rx);
+
+			if (ret)
+				return read_count;
+
+			continue;
+		}
+
+		/* count must be multiple of packet_size */
+		if (count % packet_size != 0 ||
+		    avail % packet_size != 0) {
+			dev_warn(bt->dev, "%s(), count %zu or d %lu is not multiple of packet_size %dd\n",
+				 __func__, count, avail, packet_size);
+
+			count -= count % packet_size;
+			avail -= avail % packet_size;
+		}
+
+		if (count > avail)
+			read_size = avail;
+		else
+			read_size = count;
+
+		/* calculate continue space */
+		cont = bt->rx->buf_size - cur_read_idx;
+		if (read_size > cont)
+			read_size = cont;
+
+		if (copy_to_user(buf + cur_buf_ofs,
+				 bt->rx_packet_buf + cur_read_idx,
+				 read_size)) {
+			dev_warn(bt->dev, "%s(), copy_to_user fail\n",
+				 __func__);
+			return -EFAULT;
+		}
+
+		spin_lock_irqsave(&bt->rx_lock, flags);
+		bt->rx->packet_r += read_size / packet_size;
+		spin_unlock_irqrestore(&bt->rx_lock, flags);
+
+		read_count += read_size;
+		cur_buf_ofs += read_size;
+		count -= read_size;
+	}
+
+	/*
+	 * save current timestamp & buffer time in times_tamp and
+	 * buf_data_equivalent_time
+	 */
+	bt->rx->time_stamp = sched_clock();
+	bt->rx->buf_data_equivalent_time =
+		(unsigned long long)(bt->rx->packet_w - bt->rx->packet_r) *
+		SCO_RX_PLC_SIZE * 16 * 1000 / 2 / 64;
+	bt->rx->buf_data_equivalent_time += read_count * SCO_RX_PLC_SIZE *
+					    16 * 1000 / packet_size / 2 / 64;
+	/* return equivalent time(us) to data count */
+	bt->rx->buf_data_equivalent_time *= 1000;
+
+	return read_count;
+}
+
+ssize_t mtk_btcvsd_snd_write(struct mtk_btcvsd_snd *bt,
+			     char __user *buf,
+			     size_t count)
+{
+	int written_size = count, avail = 0, cur_write_idx, write_size, cont;
+	unsigned int cur_buf_ofs = 0;
+	unsigned long flags;
+	unsigned int packet_size = bt->tx->packet_size;
+
+	/*
+	 * save current timestamp & buffer time in time_stamp and
+	 * buf_data_equivalent_time
+	 */
+	bt->tx->time_stamp = sched_clock();
+	bt->tx->buf_data_equivalent_time =
+		(unsigned long long)(bt->tx->packet_w - bt->tx->packet_r) *
+		packet_size * 16 * 1000 / 2 / 64;
+
+	/* return equivalent time(us) to data count */
+	bt->tx->buf_data_equivalent_time *= 1000;
+
+	while (count) {
+		spin_lock_irqsave(&bt->tx_lock, flags);
+		/* free space of TX packet buffer */
+		avail = bt->tx->buf_size -
+			(bt->tx->packet_w - bt->tx->packet_r) * packet_size;
+
+		cur_write_idx = (bt->tx->packet_w % SCO_TX_PACKER_BUF_NUM) *
+				packet_size;
+		spin_unlock_irqrestore(&bt->tx_lock, flags);
+
+		if (!avail) {
+			int ret = wait_for_bt_irq(bt, bt->rx);
+
+			if (ret)
+				return written_size;
+
+			continue;
+		}
+
+		/* count must be multiple of bt->tx->packet_size */
+		if (count % packet_size != 0 ||
+		    avail % packet_size != 0) {
+			dev_warn(bt->dev, "%s(), count %zu or avail %d is not multiple of packet_size %d\n",
+				 __func__, count, avail, packet_size);
+			count -= count % packet_size;
+			avail -= avail % packet_size;
+		}
+
+		if (count > avail)
+			write_size = avail;
+		else
+			write_size = count;
+
+		/* calculate continue space */
+		cont = bt->tx->buf_size - cur_write_idx;
+		if (write_size > cont)
+			write_size = cont;
+
+		if (copy_from_user(bt->tx_packet_buf +
+				   cur_write_idx,
+				   buf + cur_buf_ofs,
+				   write_size)) {
+			dev_warn(bt->dev, "%s(), copy_from_user fail\n",
+				 __func__);
+			return -EFAULT;
+		}
+
+		spin_lock_irqsave(&bt->tx_lock, flags);
+		bt->tx->packet_w += write_size / packet_size;
+		spin_unlock_irqrestore(&bt->tx_lock, flags);
+		cur_buf_ofs += write_size;
+		count -= write_size;
+	}
+
+	return written_size;
+}
+
+static struct mtk_btcvsd_snd_stream *get_bt_stream
+	(struct mtk_btcvsd_snd *bt, struct snd_pcm_substream *substream)
+{
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+		return bt->tx;
+	else
+		return bt->rx;
+}
+
+/* pcm ops */
+static const struct snd_pcm_hardware mtk_btcvsd_hardware = {
+	.info = (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
+		 SNDRV_PCM_INFO_RESUME),
+	.formats = SNDRV_PCM_FMTBIT_S16_LE,
+	.buffer_bytes_max = 24 * 1024,
+	.period_bytes_max = 24 * 1024,
+	.periods_min = 2,
+	.periods_max = 16,
+	.fifo_size = 0,
+};
+
+static int mtk_pcm_btcvsd_open(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_component *component =
+		snd_soc_rtdcom_lookup(rtd, BTCVSD_SND_NAME);
+	struct mtk_btcvsd_snd *bt = snd_soc_component_get_drvdata(component);
+	int ret;
+
+	dev_dbg(bt->dev, "%s(), stream %d, substream %p\n",
+		__func__, substream->stream, substream);
+
+	snd_soc_set_runtime_hwparams(substream, &mtk_btcvsd_hardware);
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+		ret = mtk_btcvsd_snd_tx_init(bt);
+		bt->tx->substream = substream;
+	} else {
+		ret = mtk_btcvsd_snd_rx_init(bt);
+		bt->rx->substream = substream;
+	}
+
+	return ret;
+}
+
+static int mtk_pcm_btcvsd_close(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_component *component =
+		snd_soc_rtdcom_lookup(rtd, BTCVSD_SND_NAME);
+	struct mtk_btcvsd_snd *bt = snd_soc_component_get_drvdata(component);
+	struct mtk_btcvsd_snd_stream *bt_stream = get_bt_stream(bt, substream);
+
+	dev_dbg(bt->dev, "%s(), stream %d\n", __func__, substream->stream);
+
+	mtk_btcvsd_snd_set_state(bt, bt_stream, BT_SCO_STATE_IDLE);
+	bt_stream->substream = NULL;
+	return 0;
+}
+
+static int mtk_pcm_btcvsd_hw_params(struct snd_pcm_substream *substream,
+				    struct snd_pcm_hw_params *hw_params)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_component *component =
+		snd_soc_rtdcom_lookup(rtd, BTCVSD_SND_NAME);
+	struct mtk_btcvsd_snd *bt = snd_soc_component_get_drvdata(component);
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
+	    params_buffer_bytes(hw_params) % bt->tx->packet_size != 0) {
+		dev_warn(bt->dev, "%s(), error, buffer size %d not valid\n",
+			 __func__,
+			 params_buffer_bytes(hw_params));
+		return -EINVAL;
+	}
+
+	substream->runtime->dma_bytes = params_buffer_bytes(hw_params);
+	return 0;
+}
+
+static int mtk_pcm_btcvsd_hw_free(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_component *component =
+		snd_soc_rtdcom_lookup(rtd, BTCVSD_SND_NAME);
+	struct mtk_btcvsd_snd *bt = snd_soc_component_get_drvdata(component);
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+		btcvsd_tx_clean_buffer(bt);
+
+	return 0;
+}
+
+static int mtk_pcm_btcvsd_prepare(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_component *component =
+		snd_soc_rtdcom_lookup(rtd, BTCVSD_SND_NAME);
+	struct mtk_btcvsd_snd *bt = snd_soc_component_get_drvdata(component);
+	struct mtk_btcvsd_snd_stream *bt_stream = get_bt_stream(bt, substream);
+
+	dev_dbg(bt->dev, "%s(), stream %d\n", __func__, substream->stream);
+
+	mtk_btcvsd_snd_set_state(bt, bt_stream, BT_SCO_STATE_RUNNING);
+	return 0;
+}
+
+static int mtk_pcm_btcvsd_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_component *component =
+		snd_soc_rtdcom_lookup(rtd, BTCVSD_SND_NAME);
+	struct mtk_btcvsd_snd *bt = snd_soc_component_get_drvdata(component);
+	struct mtk_btcvsd_snd_stream *bt_stream = get_bt_stream(bt, substream);
+	int stream = substream->stream;
+	int hw_packet_ptr;
+
+	dev_dbg(bt->dev, "%s(), stream %d, cmd %d\n",
+		__func__, substream->stream, cmd);
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+		hw_packet_ptr = stream == SNDRV_PCM_STREAM_PLAYBACK ?
+				bt_stream->packet_r : bt_stream->packet_w;
+		bt_stream->prev_packet_idx = hw_packet_ptr;
+		bt_stream->prev_frame = 0;
+		bt_stream->trigger_start = 1;
+		return 0;
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+		bt_stream->trigger_start = 0;
+		mtk_btcvsd_snd_set_state(bt, bt_stream, BT_SCO_STATE_ENDING);
+		return 0;
+	default:
+		return -EINVAL;
+	}
+}
+
+static snd_pcm_uframes_t mtk_pcm_btcvsd_pointer
+	(struct snd_pcm_substream *substream)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_component *component =
+		snd_soc_rtdcom_lookup(rtd, BTCVSD_SND_NAME);
+	struct mtk_btcvsd_snd *bt = snd_soc_component_get_drvdata(component);
+	struct mtk_btcvsd_snd_stream *bt_stream;
+	snd_pcm_uframes_t frame = 0;
+	int byte = 0;
+	int hw_packet_ptr;
+	int packet_diff;
+	spinlock_t *lock;	/* spinlock for bt stream control */
+	unsigned long flags;
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+		lock = &bt->tx_lock;
+		bt_stream = bt->tx;
+	} else {
+		lock = &bt->rx_lock;
+		bt_stream = bt->rx;
+	}
+
+	spin_lock_irqsave(lock, flags);
+	hw_packet_ptr = substream->stream == SNDRV_PCM_STREAM_PLAYBACK ?
+			bt->tx->packet_r : bt->rx->packet_w;
+
+	/* get packet diff from last time */
+	if (hw_packet_ptr >= bt_stream->prev_packet_idx) {
+		packet_diff = hw_packet_ptr - bt_stream->prev_packet_idx;
+	} else {
+		/* integer overflow */
+		packet_diff = (INT_MAX - bt_stream->prev_packet_idx) +
+			      (hw_packet_ptr - INT_MIN) + 1;
+	}
+	bt_stream->prev_packet_idx = hw_packet_ptr;
+
+	/* increased bytes */
+	byte = packet_diff * bt_stream->packet_size;
+
+	frame = btcvsd_bytes_to_frame(substream, byte);
+	frame += bt_stream->prev_frame;
+	frame %= substream->runtime->buffer_size;
+
+	bt_stream->prev_frame = frame;
+
+	spin_unlock_irqrestore(lock, flags);
+
+	return frame;
+}
+
+static int mtk_pcm_btcvsd_copy(struct snd_pcm_substream *substream,
+			       int channel, unsigned long pos,
+			       void __user *buf, unsigned long count)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct snd_soc_component *component =
+		snd_soc_rtdcom_lookup(rtd, BTCVSD_SND_NAME);
+	struct mtk_btcvsd_snd *bt = snd_soc_component_get_drvdata(component);
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+		mtk_btcvsd_snd_write(bt, buf, count);
+	else
+		mtk_btcvsd_snd_read(bt, buf, count);
+
+	return 0;
+}
+
+static struct snd_pcm_ops mtk_btcvsd_ops = {
+	.open = mtk_pcm_btcvsd_open,
+	.close = mtk_pcm_btcvsd_close,
+	.ioctl = snd_pcm_lib_ioctl,
+	.hw_params = mtk_pcm_btcvsd_hw_params,
+	.hw_free = mtk_pcm_btcvsd_hw_free,
+	.prepare = mtk_pcm_btcvsd_prepare,
+	.trigger = mtk_pcm_btcvsd_trigger,
+	.pointer = mtk_pcm_btcvsd_pointer,
+	.copy_user = mtk_pcm_btcvsd_copy,
+};
+
+/* kcontrol */
+static const char *const btsco_band_str[] = {"NB", "WB"};
+
+static const struct soc_enum btcvsd_enum[] = {
+	SOC_ENUM_SINGLE_EXT(ARRAY_SIZE(btsco_band_str), btsco_band_str),
+};
+
+static int btcvsd_band_get(struct snd_kcontrol *kcontrol,
+			   struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_component *cmpnt = snd_soc_kcontrol_component(kcontrol);
+	struct mtk_btcvsd_snd *bt = snd_soc_component_get_drvdata(cmpnt);
+
+	ucontrol->value.integer.value[0] = bt->band;
+	return 0;
+}
+
+static int btcvsd_band_set(struct snd_kcontrol *kcontrol,
+			   struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_component *cmpnt = snd_soc_kcontrol_component(kcontrol);
+	struct mtk_btcvsd_snd *bt = snd_soc_component_get_drvdata(cmpnt);
+	struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
+
+	if (ucontrol->value.enumerated.item[0] >= e->items)
+		return -EINVAL;
+
+	bt->band = ucontrol->value.integer.value[0];
+	dev_dbg(bt->dev, "%s(), band %d\n", __func__, bt->band);
+	return 0;
+}
+
+static int btcvsd_tx_mute_get(struct snd_kcontrol *kcontrol,
+			      struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_component *cmpnt = snd_soc_kcontrol_component(kcontrol);
+	struct mtk_btcvsd_snd *bt = snd_soc_component_get_drvdata(cmpnt);
+
+	if (!bt->tx) {
+		ucontrol->value.integer.value[0] = 0;
+		return 0;
+	}
+
+	ucontrol->value.integer.value[0] = bt->tx->mute;
+	return 0;
+}
+
+static int btcvsd_tx_mute_set(struct snd_kcontrol *kcontrol,
+			      struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_component *cmpnt = snd_soc_kcontrol_component(kcontrol);
+	struct mtk_btcvsd_snd *bt = snd_soc_component_get_drvdata(cmpnt);
+
+	if (!bt->tx)
+		return 0;
+
+	bt->tx->mute = ucontrol->value.integer.value[0];
+	return 0;
+}
+
+static int btcvsd_rx_irq_received_get(struct snd_kcontrol *kcontrol,
+				      struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_component *cmpnt = snd_soc_kcontrol_component(kcontrol);
+	struct mtk_btcvsd_snd *bt = snd_soc_component_get_drvdata(cmpnt);
+
+	if (!bt->rx)
+		return 0;
+
+	ucontrol->value.integer.value[0] = bt->rx->rw_cnt ? 1 : 0;
+	return 0;
+}
+
+static int btcvsd_rx_timeout_get(struct snd_kcontrol *kcontrol,
+				 struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_component *cmpnt = snd_soc_kcontrol_component(kcontrol);
+	struct mtk_btcvsd_snd *bt = snd_soc_component_get_drvdata(cmpnt);
+
+	if (!bt->rx)
+		return 0;
+
+	ucontrol->value.integer.value[0] = bt->rx->timeout;
+	bt->rx->timeout = 0;
+	return 0;
+}
+
+static int btcvsd_rx_timestamp_get(struct snd_kcontrol *kcontrol,
+				   unsigned int __user *data, unsigned int size)
+{
+	struct snd_soc_component *cmpnt = snd_soc_kcontrol_component(kcontrol);
+	struct mtk_btcvsd_snd *bt = snd_soc_component_get_drvdata(cmpnt);
+	int ret = 0;
+	struct mtk_btcvsd_snd_time_buffer_info time_buffer_info_rx;
+
+	if (size > sizeof(struct mtk_btcvsd_snd_time_buffer_info))
+		return -EINVAL;
+
+	get_rx_time_stamp(bt, &time_buffer_info_rx);
+
+	dev_dbg(bt->dev, "%s(), time_stamp_us %llu, data_count_equi_time %llu",
+		__func__,
+		time_buffer_info_rx.time_stamp_us,
+		time_buffer_info_rx.data_count_equi_time);
+
+	if (copy_to_user(data, &time_buffer_info_rx,
+			 sizeof(struct mtk_btcvsd_snd_time_buffer_info))) {
+		dev_warn(bt->dev, "%s(), copy_to_user fail", __func__);
+		ret = -EFAULT;
+	}
+
+	return ret;
+}
+
+static int btcvsd_tx_irq_received_get(struct snd_kcontrol *kcontrol,
+				      struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_component *cmpnt = snd_soc_kcontrol_component(kcontrol);
+	struct mtk_btcvsd_snd *bt = snd_soc_component_get_drvdata(cmpnt);
+
+	if (!bt->tx)
+		return 0;
+
+	ucontrol->value.integer.value[0] = bt->tx->rw_cnt ? 1 : 0;
+	return 0;
+}
+
+static int btcvsd_tx_timeout_get(struct snd_kcontrol *kcontrol,
+				 struct snd_ctl_elem_value *ucontrol)
+{
+	struct snd_soc_component *cmpnt = snd_soc_kcontrol_component(kcontrol);
+	struct mtk_btcvsd_snd *bt = snd_soc_component_get_drvdata(cmpnt);
+
+	ucontrol->value.integer.value[0] = bt->tx->timeout;
+	return 0;
+}
+
+static int btcvsd_tx_timestamp_get(struct snd_kcontrol *kcontrol,
+				   unsigned int __user *data, unsigned int size)
+{
+	struct snd_soc_component *cmpnt = snd_soc_kcontrol_component(kcontrol);
+	struct mtk_btcvsd_snd *bt = snd_soc_component_get_drvdata(cmpnt);
+	int ret = 0;
+	struct mtk_btcvsd_snd_time_buffer_info time_buffer_info_tx;
+
+	if (size > sizeof(struct mtk_btcvsd_snd_time_buffer_info))
+		return -EINVAL;
+
+	get_tx_time_stamp(bt, &time_buffer_info_tx);
+
+	dev_dbg(bt->dev, "%s(), time_stamp_us %llu, data_count_equi_time %llu",
+		__func__,
+		time_buffer_info_tx.time_stamp_us,
+		time_buffer_info_tx.data_count_equi_time);
+
+	if (copy_to_user(data, &time_buffer_info_tx,
+			 sizeof(struct mtk_btcvsd_snd_time_buffer_info))) {
+		dev_warn(bt->dev, "%s(), copy_to_user fail", __func__);
+		ret = -EFAULT;
+	}
+
+	return ret;
+}
+
+static const struct snd_kcontrol_new mtk_btcvsd_snd_controls[] = {
+	SOC_ENUM_EXT("BTCVSD Band", btcvsd_enum[0],
+		     btcvsd_band_get, btcvsd_band_set),
+	SOC_SINGLE_BOOL_EXT("BTCVSD Tx Mute Switch", 0,
+			    btcvsd_tx_mute_get, btcvsd_tx_mute_set),
+	SOC_SINGLE_BOOL_EXT("BTCVSD Tx Irq Received Switch", 0,
+			    btcvsd_tx_irq_received_get, NULL),
+	SOC_SINGLE_BOOL_EXT("BTCVSD Tx Timeout Switch", 0,
+			    btcvsd_tx_timeout_get, NULL),
+	SOC_SINGLE_BOOL_EXT("BTCVSD Rx Irq Received Switch", 0,
+			    btcvsd_rx_irq_received_get, NULL),
+	SOC_SINGLE_BOOL_EXT("BTCVSD Rx Timeout Switch", 0,
+			    btcvsd_rx_timeout_get, NULL),
+	SND_SOC_BYTES_TLV("BTCVSD Rx Timestamp",
+			  sizeof(struct mtk_btcvsd_snd_time_buffer_info),
+			  btcvsd_rx_timestamp_get, NULL),
+	SND_SOC_BYTES_TLV("BTCVSD Tx Timestamp",
+			  sizeof(struct mtk_btcvsd_snd_time_buffer_info),
+			  btcvsd_tx_timestamp_get, NULL),
+};
+
+static int mtk_btcvsd_snd_component_probe(struct snd_soc_component *component)
+{
+	return snd_soc_add_component_controls(component,
+		mtk_btcvsd_snd_controls,
+		ARRAY_SIZE(mtk_btcvsd_snd_controls));
+}
+
+static const struct snd_soc_component_driver mtk_btcvsd_snd_platform = {
+	.name = BTCVSD_SND_NAME,
+	.ops = &mtk_btcvsd_ops,
+	.probe = mtk_btcvsd_snd_component_probe,
+};
+
+static int mtk_btcvsd_snd_probe(struct platform_device *pdev)
+{
+	int ret = 0;
+	int irq_id;
+	u32 offset[5] = {0, 0, 0, 0, 0};
+	struct mtk_btcvsd_snd *btcvsd;
+	struct device *dev = &pdev->dev;
+
+	/* init btcvsd private data */
+	btcvsd = devm_kzalloc(dev, sizeof(*btcvsd), GFP_KERNEL);
+	if (!btcvsd)
+		return -ENOMEM;
+	platform_set_drvdata(pdev, btcvsd);
+	btcvsd->dev = dev;
+
+	/* init tx/rx */
+	btcvsd->rx = devm_kzalloc(btcvsd->dev, sizeof(*btcvsd->rx), GFP_KERNEL);
+	if (!btcvsd->rx)
+		return -ENOMEM;
+
+	btcvsd->tx = devm_kzalloc(btcvsd->dev, sizeof(*btcvsd->tx), GFP_KERNEL);
+	if (!btcvsd->tx)
+		return -ENOMEM;
+
+	spin_lock_init(&btcvsd->tx_lock);
+	spin_lock_init(&btcvsd->rx_lock);
+
+	init_waitqueue_head(&btcvsd->tx_wait);
+	init_waitqueue_head(&btcvsd->rx_wait);
+
+	mtk_btcvsd_snd_tx_init(btcvsd);
+	mtk_btcvsd_snd_rx_init(btcvsd);
+
+	/* irq */
+	irq_id = platform_get_irq(pdev, 0);
+	if (irq_id <= 0) {
+		dev_err(dev, "%s no irq found\n", dev->of_node->name);
+		return irq_id < 0 ? irq_id : -ENXIO;
+	}
+
+	ret = devm_request_irq(dev, irq_id, mtk_btcvsd_snd_irq_handler,
+			       IRQF_TRIGGER_LOW, "BTCVSD_ISR_Handle",
+			       (void *)btcvsd);
+	if (ret) {
+		dev_err(dev, "could not request_irq for BTCVSD_ISR_Handle\n");
+		return ret;
+	}
+
+	btcvsd->irq_id = irq_id;
+
+	/* iomap */
+	btcvsd->bt_pkv_base = of_iomap(dev->of_node, 0);
+	if (!btcvsd->bt_pkv_base) {
+		dev_err(dev, "iomap bt_pkv_base fail\n");
+		return -EIO;
+	}
+
+	btcvsd->bt_sram_bank2_base = of_iomap(dev->of_node, 1);
+	if (!btcvsd->bt_sram_bank2_base) {
+		dev_err(dev, "iomap bt_sram_bank2_base fail\n");
+		return -EIO;
+	}
+
+	btcvsd->infra = syscon_regmap_lookup_by_phandle(dev->of_node,
+							"mediatek,infracfg");
+	if (IS_ERR(btcvsd->infra)) {
+		dev_err(dev, "cannot find infra controller: %ld\n",
+			PTR_ERR(btcvsd->infra));
+		return PTR_ERR(btcvsd->infra);
+	}
+
+	/* get offset */
+	ret = of_property_read_u32_array(dev->of_node, "mediatek,offset",
+					 offset,
+					 ARRAY_SIZE(offset));
+	if (ret) {
+		dev_warn(dev, "%s(), get offest fail, ret %d\n", __func__, ret);
+		return ret;
+	}
+	btcvsd->infra_misc_offset = offset[0];
+	btcvsd->conn_bt_cvsd_mask = offset[1];
+	btcvsd->cvsd_mcu_read_offset = offset[2];
+	btcvsd->cvsd_mcu_write_offset = offset[3];
+	btcvsd->cvsd_packet_indicator = offset[4];
+
+	btcvsd->bt_reg_pkt_r = btcvsd->bt_pkv_base +
+			       btcvsd->cvsd_mcu_read_offset;
+	btcvsd->bt_reg_pkt_w = btcvsd->bt_pkv_base +
+			       btcvsd->cvsd_mcu_write_offset;
+	btcvsd->bt_reg_ctl = btcvsd->bt_pkv_base +
+			     btcvsd->cvsd_packet_indicator;
+
+	/* init state */
+	mtk_btcvsd_snd_set_state(btcvsd, btcvsd->tx, BT_SCO_STATE_IDLE);
+	mtk_btcvsd_snd_set_state(btcvsd, btcvsd->rx, BT_SCO_STATE_IDLE);
+
+	return devm_snd_soc_register_component(dev, &mtk_btcvsd_snd_platform,
+					       NULL, 0);
+}
+
+static int mtk_btcvsd_snd_remove(struct platform_device *pdev)
+{
+	struct mtk_btcvsd_snd *btcvsd = dev_get_drvdata(&pdev->dev);
+
+	iounmap(btcvsd->bt_pkv_base);
+	iounmap(btcvsd->bt_sram_bank2_base);
+	return 0;
+}
+
+static const struct of_device_id mtk_btcvsd_snd_dt_match[] = {
+	{ .compatible = "mediatek,mtk-btcvsd-snd", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, mtk_btcvsd_snd_dt_match);
+
+static struct platform_driver mtk_btcvsd_snd_driver = {
+	.driver = {
+		.name = "mtk-btcvsd-snd",
+		.of_match_table = mtk_btcvsd_snd_dt_match,
+	},
+	.probe = mtk_btcvsd_snd_probe,
+	.remove = mtk_btcvsd_snd_remove,
+};
+
+module_platform_driver(mtk_btcvsd_snd_driver);
+
+MODULE_DESCRIPTION("Mediatek ALSA BT SCO CVSD/MSBC Driver");
+MODULE_AUTHOR("KaiChieh Chuang <kaichieh.chuang@mediatek.com>");
+MODULE_LICENSE("GPL v2");