The driver function for transferring/receiving BT encoded data to/from BT hardware.

Signed-off-by: KaiChieh Chuang kaichieh.chuang@mediatek.com --- sound/soc/mediatek/Kconfig | 9 + sound/soc/mediatek/common/Makefile | 2 + sound/soc/mediatek/common/mtk-btcvsd.c | 1376 ++++++++++++++++++++++++ 3 files changed, 1387 insertions(+) create mode 100644 sound/soc/mediatek/common/mtk-btcvsd.c

diff --git a/sound/soc/mediatek/Kconfig b/sound/soc/mediatek/Kconfig index e731d40afcce..6b4d00a3e550 100644 --- a/sound/soc/mediatek/Kconfig +++ b/sound/soc/mediatek/Kconfig @@ -105,3 +105,12 @@ config SND_SOC_MT8173_RT5650_RT5676 with the RT5650 and RT5676 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 hardware. + Select Y if you have such device. + If unsure select "N". diff --git a/sound/soc/mediatek/common/Makefile b/sound/soc/mediatek/common/Makefile index cdadabc5fd16..9ab90433a8d7 100644 --- a/sound/soc/mediatek/common/Makefile +++ b/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 diff --git a/sound/soc/mediatek/common/mtk-btcvsd.c b/sound/soc/mediatek/common/mtk-btcvsd.c new file mode 100644 index 000000000000..8a0bab3d5148 --- /dev/null +++ b/sound/soc/mediatek/common/mtk-btcvsd.c @@ -0,0 +1,1376 @@ +// 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_info(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_info(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_info(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); + + dev_info(bt->dev, "%s(), stream %d\n", __func__, substream->stream); + + 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_info(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 char *const btsco_mute_str[] = {"Off", "On"}; +static const char *const irq_received_str[] = {"No", "Yes"}; +static const char *const rx_timeout_str[] = {"No", "Yes"}; + +static const struct soc_enum btcvsd_enum[] = { + SOC_ENUM_SINGLE_EXT(ARRAY_SIZE(btsco_band_str), btsco_band_str), + SOC_ENUM_SINGLE_EXT(ARRAY_SIZE(btsco_mute_str), btsco_mute_str), + SOC_ENUM_SINGLE_EXT(ARRAY_SIZE(irq_received_str), irq_received_str), + SOC_ENUM_SINGLE_EXT(ARRAY_SIZE(rx_timeout_str), rx_timeout_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_info(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); + struct soc_enum *e = (struct soc_enum *)kcontrol->private_value; + + if (ucontrol->value.enumerated.item[0] >= e->items) + return -EINVAL; + + if (!bt->tx) + return 0; + + bt->tx->mute = ucontrol->value.integer.value[0]; + dev_info(bt->dev, "%s(), mute %d\n", __func__, bt->tx->mute); + 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_info(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_info(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_ENUM_EXT("btcvsd_tx_mute", btcvsd_enum[1], btcvsd_tx_mute_get, + btcvsd_tx_mute_set), + SOC_ENUM_EXT("btcvsd_rx_irq_received", btcvsd_enum[2], + btcvsd_rx_irq_received_get, NULL), + SOC_ENUM_EXT("btcvsd_rx_timeout", btcvsd_enum[3], + btcvsd_rx_timeout_get, NULL), + SOC_ENUM_EXT("btcvsd_tx_irq_received", btcvsd_enum[2], + btcvsd_tx_irq_received_get, NULL), + SND_SOC_BYTES_TLV("btcvsd_rx_timestamp", + sizeof(struct mtk_btcvsd_snd_time_buffer_info), + btcvsd_rx_timestamp_get, NULL), + SOC_ENUM_EXT("btcvsd_tx_timeout", btcvsd_enum[3], + btcvsd_tx_timeout_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, + "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, "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");