| /* |
| * soc-cache.c -- ASoC register cache helpers |
| * |
| * Copyright 2009 Wolfson Microelectronics PLC. |
| * |
| * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License as published by the |
| * Free Software Foundation; either version 2 of the License, or (at your |
| * option) any later version. |
| */ |
| |
| #include <linux/i2c.h> |
| #include <linux/spi/spi.h> |
| #include <sound/soc.h> |
| |
| static unsigned int snd_soc_4_12_read(struct snd_soc_codec *codec, |
| unsigned int reg) |
| { |
| u16 *cache = codec->reg_cache; |
| if (reg >= codec->reg_cache_size) |
| return -1; |
| return cache[reg]; |
| } |
| |
| static int snd_soc_4_12_write(struct snd_soc_codec *codec, unsigned int reg, |
| unsigned int value) |
| { |
| u16 *cache = codec->reg_cache; |
| u8 data[2]; |
| int ret; |
| |
| BUG_ON(codec->volatile_register); |
| |
| data[0] = (reg << 4) | ((value >> 8) & 0x000f); |
| data[1] = value & 0x00ff; |
| |
| if (reg < codec->reg_cache_size) |
| cache[reg] = value; |
| |
| if (codec->cache_only) { |
| codec->cache_sync = 1; |
| return 0; |
| } |
| |
| ret = codec->hw_write(codec->control_data, data, 2); |
| if (ret == 2) |
| return 0; |
| if (ret < 0) |
| return ret; |
| else |
| return -EIO; |
| } |
| |
| #if defined(CONFIG_SPI_MASTER) |
| static int snd_soc_4_12_spi_write(void *control_data, const char *data, |
| int len) |
| { |
| struct spi_device *spi = control_data; |
| struct spi_transfer t; |
| struct spi_message m; |
| u8 msg[2]; |
| |
| if (len <= 0) |
| return 0; |
| |
| msg[0] = data[1]; |
| msg[1] = data[0]; |
| |
| spi_message_init(&m); |
| memset(&t, 0, (sizeof t)); |
| |
| t.tx_buf = &msg[0]; |
| t.len = len; |
| |
| spi_message_add_tail(&t, &m); |
| spi_sync(spi, &m); |
| |
| return len; |
| } |
| #else |
| #define snd_soc_4_12_spi_write NULL |
| #endif |
| |
| static unsigned int snd_soc_7_9_read(struct snd_soc_codec *codec, |
| unsigned int reg) |
| { |
| u16 *cache = codec->reg_cache; |
| if (reg >= codec->reg_cache_size) |
| return -1; |
| return cache[reg]; |
| } |
| |
| static int snd_soc_7_9_write(struct snd_soc_codec *codec, unsigned int reg, |
| unsigned int value) |
| { |
| u16 *cache = codec->reg_cache; |
| u8 data[2]; |
| int ret; |
| |
| BUG_ON(codec->volatile_register); |
| |
| data[0] = (reg << 1) | ((value >> 8) & 0x0001); |
| data[1] = value & 0x00ff; |
| |
| if (reg < codec->reg_cache_size) |
| cache[reg] = value; |
| |
| if (codec->cache_only) { |
| codec->cache_sync = 1; |
| return 0; |
| } |
| |
| ret = codec->hw_write(codec->control_data, data, 2); |
| if (ret == 2) |
| return 0; |
| if (ret < 0) |
| return ret; |
| else |
| return -EIO; |
| } |
| |
| #if defined(CONFIG_SPI_MASTER) |
| static int snd_soc_7_9_spi_write(void *control_data, const char *data, |
| int len) |
| { |
| struct spi_device *spi = control_data; |
| struct spi_transfer t; |
| struct spi_message m; |
| u8 msg[2]; |
| |
| if (len <= 0) |
| return 0; |
| |
| msg[0] = data[0]; |
| msg[1] = data[1]; |
| |
| spi_message_init(&m); |
| memset(&t, 0, (sizeof t)); |
| |
| t.tx_buf = &msg[0]; |
| t.len = len; |
| |
| spi_message_add_tail(&t, &m); |
| spi_sync(spi, &m); |
| |
| return len; |
| } |
| #else |
| #define snd_soc_7_9_spi_write NULL |
| #endif |
| |
| static int snd_soc_8_8_write(struct snd_soc_codec *codec, unsigned int reg, |
| unsigned int value) |
| { |
| u8 *cache = codec->reg_cache; |
| u8 data[2]; |
| |
| BUG_ON(codec->volatile_register); |
| |
| data[0] = reg & 0xff; |
| data[1] = value & 0xff; |
| |
| if (reg < codec->reg_cache_size) |
| cache[reg] = value; |
| |
| if (codec->cache_only) { |
| codec->cache_sync = 1; |
| return 0; |
| } |
| |
| if (codec->hw_write(codec->control_data, data, 2) == 2) |
| return 0; |
| else |
| return -EIO; |
| } |
| |
| static unsigned int snd_soc_8_8_read(struct snd_soc_codec *codec, |
| unsigned int reg) |
| { |
| u8 *cache = codec->reg_cache; |
| if (reg >= codec->reg_cache_size) |
| return -1; |
| return cache[reg]; |
| } |
| |
| static int snd_soc_8_16_write(struct snd_soc_codec *codec, unsigned int reg, |
| unsigned int value) |
| { |
| u16 *reg_cache = codec->reg_cache; |
| u8 data[3]; |
| |
| data[0] = reg; |
| data[1] = (value >> 8) & 0xff; |
| data[2] = value & 0xff; |
| |
| if (!snd_soc_codec_volatile_register(codec, reg)) |
| reg_cache[reg] = value; |
| |
| if (codec->cache_only) { |
| codec->cache_sync = 1; |
| return 0; |
| } |
| |
| if (codec->hw_write(codec->control_data, data, 3) == 3) |
| return 0; |
| else |
| return -EIO; |
| } |
| |
| static unsigned int snd_soc_8_16_read(struct snd_soc_codec *codec, |
| unsigned int reg) |
| { |
| u16 *cache = codec->reg_cache; |
| |
| if (reg >= codec->reg_cache_size || |
| snd_soc_codec_volatile_register(codec, reg)) { |
| if (codec->cache_only) |
| return -EINVAL; |
| |
| return codec->hw_read(codec, reg); |
| } else { |
| return cache[reg]; |
| } |
| } |
| |
| #if defined(CONFIG_I2C) || (defined(CONFIG_I2C_MODULE) && defined(MODULE)) |
| static unsigned int snd_soc_8_16_read_i2c(struct snd_soc_codec *codec, |
| unsigned int r) |
| { |
| struct i2c_msg xfer[2]; |
| u8 reg = r; |
| u16 data; |
| int ret; |
| struct i2c_client *client = codec->control_data; |
| |
| /* Write register */ |
| xfer[0].addr = client->addr; |
| xfer[0].flags = 0; |
| xfer[0].len = 1; |
| xfer[0].buf = ® |
| |
| /* Read data */ |
| xfer[1].addr = client->addr; |
| xfer[1].flags = I2C_M_RD; |
| xfer[1].len = 2; |
| xfer[1].buf = (u8 *)&data; |
| |
| ret = i2c_transfer(client->adapter, xfer, 2); |
| if (ret != 2) { |
| dev_err(&client->dev, "i2c_transfer() returned %d\n", ret); |
| return 0; |
| } |
| |
| return (data >> 8) | ((data & 0xff) << 8); |
| } |
| #else |
| #define snd_soc_8_16_read_i2c NULL |
| #endif |
| |
| #if defined(CONFIG_I2C) || (defined(CONFIG_I2C_MODULE) && defined(MODULE)) |
| static unsigned int snd_soc_16_8_read_i2c(struct snd_soc_codec *codec, |
| unsigned int r) |
| { |
| struct i2c_msg xfer[2]; |
| u16 reg = r; |
| u8 data; |
| int ret; |
| struct i2c_client *client = codec->control_data; |
| |
| /* Write register */ |
| xfer[0].addr = client->addr; |
| xfer[0].flags = 0; |
| xfer[0].len = 2; |
| xfer[0].buf = (u8 *)® |
| |
| /* Read data */ |
| xfer[1].addr = client->addr; |
| xfer[1].flags = I2C_M_RD; |
| xfer[1].len = 1; |
| xfer[1].buf = &data; |
| |
| ret = i2c_transfer(client->adapter, xfer, 2); |
| if (ret != 2) { |
| dev_err(&client->dev, "i2c_transfer() returned %d\n", ret); |
| return 0; |
| } |
| |
| return data; |
| } |
| #else |
| #define snd_soc_16_8_read_i2c NULL |
| #endif |
| |
| static unsigned int snd_soc_16_8_read(struct snd_soc_codec *codec, |
| unsigned int reg) |
| { |
| u16 *cache = codec->reg_cache; |
| |
| reg &= 0xff; |
| if (reg >= codec->reg_cache_size) |
| return -1; |
| return cache[reg]; |
| } |
| |
| static int snd_soc_16_8_write(struct snd_soc_codec *codec, unsigned int reg, |
| unsigned int value) |
| { |
| u16 *cache = codec->reg_cache; |
| u8 data[3]; |
| int ret; |
| |
| BUG_ON(codec->volatile_register); |
| |
| data[0] = (reg >> 8) & 0xff; |
| data[1] = reg & 0xff; |
| data[2] = value; |
| |
| reg &= 0xff; |
| if (reg < codec->reg_cache_size) |
| cache[reg] = value; |
| |
| if (codec->cache_only) { |
| codec->cache_sync = 1; |
| return 0; |
| } |
| |
| ret = codec->hw_write(codec->control_data, data, 3); |
| if (ret == 3) |
| return 0; |
| if (ret < 0) |
| return ret; |
| else |
| return -EIO; |
| } |
| |
| #if defined(CONFIG_SPI_MASTER) |
| static int snd_soc_16_8_spi_write(void *control_data, const char *data, |
| int len) |
| { |
| struct spi_device *spi = control_data; |
| struct spi_transfer t; |
| struct spi_message m; |
| u8 msg[3]; |
| |
| if (len <= 0) |
| return 0; |
| |
| msg[0] = data[0]; |
| msg[1] = data[1]; |
| msg[2] = data[2]; |
| |
| spi_message_init(&m); |
| memset(&t, 0, (sizeof t)); |
| |
| t.tx_buf = &msg[0]; |
| t.len = len; |
| |
| spi_message_add_tail(&t, &m); |
| spi_sync(spi, &m); |
| |
| return len; |
| } |
| #else |
| #define snd_soc_16_8_spi_write NULL |
| #endif |
| |
| |
| static struct { |
| int addr_bits; |
| int data_bits; |
| int (*write)(struct snd_soc_codec *codec, unsigned int, unsigned int); |
| int (*spi_write)(void *, const char *, int); |
| unsigned int (*read)(struct snd_soc_codec *, unsigned int); |
| unsigned int (*i2c_read)(struct snd_soc_codec *, unsigned int); |
| } io_types[] = { |
| { |
| .addr_bits = 4, .data_bits = 12, |
| .write = snd_soc_4_12_write, .read = snd_soc_4_12_read, |
| .spi_write = snd_soc_4_12_spi_write, |
| }, |
| { |
| .addr_bits = 7, .data_bits = 9, |
| .write = snd_soc_7_9_write, .read = snd_soc_7_9_read, |
| .spi_write = snd_soc_7_9_spi_write, |
| }, |
| { |
| .addr_bits = 8, .data_bits = 8, |
| .write = snd_soc_8_8_write, .read = snd_soc_8_8_read, |
| }, |
| { |
| .addr_bits = 8, .data_bits = 16, |
| .write = snd_soc_8_16_write, .read = snd_soc_8_16_read, |
| .i2c_read = snd_soc_8_16_read_i2c, |
| }, |
| { |
| .addr_bits = 16, .data_bits = 8, |
| .write = snd_soc_16_8_write, .read = snd_soc_16_8_read, |
| .i2c_read = snd_soc_16_8_read_i2c, |
| .spi_write = snd_soc_16_8_spi_write, |
| }, |
| }; |
| |
| /** |
| * snd_soc_codec_set_cache_io: Set up standard I/O functions. |
| * |
| * @codec: CODEC to configure. |
| * @type: Type of cache. |
| * @addr_bits: Number of bits of register address data. |
| * @data_bits: Number of bits of data per register. |
| * @control: Control bus used. |
| * |
| * Register formats are frequently shared between many I2C and SPI |
| * devices. In order to promote code reuse the ASoC core provides |
| * some standard implementations of CODEC read and write operations |
| * which can be set up using this function. |
| * |
| * The caller is responsible for allocating and initialising the |
| * actual cache. |
| * |
| * Note that at present this code cannot be used by CODECs with |
| * volatile registers. |
| */ |
| int snd_soc_codec_set_cache_io(struct snd_soc_codec *codec, |
| int addr_bits, int data_bits, |
| enum snd_soc_control_type control) |
| { |
| int i; |
| |
| for (i = 0; i < ARRAY_SIZE(io_types); i++) |
| if (io_types[i].addr_bits == addr_bits && |
| io_types[i].data_bits == data_bits) |
| break; |
| if (i == ARRAY_SIZE(io_types)) { |
| printk(KERN_ERR |
| "No I/O functions for %d bit address %d bit data\n", |
| addr_bits, data_bits); |
| return -EINVAL; |
| } |
| |
| codec->write = io_types[i].write; |
| codec->read = io_types[i].read; |
| |
| switch (control) { |
| case SND_SOC_CUSTOM: |
| break; |
| |
| case SND_SOC_I2C: |
| #if defined(CONFIG_I2C) || (defined(CONFIG_I2C_MODULE) && defined(MODULE)) |
| codec->hw_write = (hw_write_t)i2c_master_send; |
| #endif |
| if (io_types[i].i2c_read) |
| codec->hw_read = io_types[i].i2c_read; |
| break; |
| |
| case SND_SOC_SPI: |
| if (io_types[i].spi_write) |
| codec->hw_write = io_types[i].spi_write; |
| break; |
| } |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(snd_soc_codec_set_cache_io); |