2 * soc-cache.c -- ASoC register cache helpers
4 * Copyright 2009 Wolfson Microelectronics PLC.
6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
14 #include <linux/i2c.h>
15 #include <linux/spi/spi.h>
16 #include <sound/soc.h>
18 static unsigned int snd_soc_7_9_read(struct snd_soc_codec *codec,
21 u16 *cache = codec->reg_cache;
22 if (reg >= codec->reg_cache_size)
27 static int snd_soc_7_9_write(struct snd_soc_codec *codec, unsigned int reg,
30 u16 *cache = codec->reg_cache;
34 BUG_ON(codec->volatile_register);
36 data[0] = (reg << 1) | ((value >> 8) & 0x0001);
37 data[1] = value & 0x00ff;
39 if (reg < codec->reg_cache_size)
41 ret = codec->hw_write(codec->control_data, data, 2);
50 #if defined(CONFIG_SPI_MASTER)
51 static int snd_soc_7_9_spi_write(void *control_data, const char *data,
54 struct spi_device *spi = control_data;
55 struct spi_transfer t;
66 memset(&t, 0, (sizeof t));
71 spi_message_add_tail(&t, &m);
77 #define snd_soc_7_9_spi_write NULL
80 static int snd_soc_8_16_write(struct snd_soc_codec *codec, unsigned int reg,
83 u16 *reg_cache = codec->reg_cache;
87 data[1] = (value >> 8) & 0xff;
88 data[2] = value & 0xff;
90 if (!snd_soc_codec_volatile_register(codec, reg))
91 reg_cache[reg] = value;
93 if (codec->hw_write(codec->control_data, data, 3) == 3)
99 static unsigned int snd_soc_8_16_read(struct snd_soc_codec *codec,
102 u16 *cache = codec->reg_cache;
104 if (reg >= codec->reg_cache_size ||
105 snd_soc_codec_volatile_register(codec, reg))
106 return codec->hw_read(codec, reg);
111 #if defined(CONFIG_I2C) || (defined(CONFIG_I2C_MODULE) && defined(MODULE))
112 static unsigned int snd_soc_8_16_read_i2c(struct snd_soc_codec *codec,
115 struct i2c_msg xfer[2];
119 struct i2c_client *client = codec->control_data;
122 xfer[0].addr = client->addr;
128 xfer[1].addr = client->addr;
129 xfer[1].flags = I2C_M_RD;
131 xfer[1].buf = (u8 *)&data;
133 ret = i2c_transfer(client->adapter, xfer, 2);
135 dev_err(&client->dev, "i2c_transfer() returned %d\n", ret);
139 return (data >> 8) | ((data & 0xff) << 8);
142 #define snd_soc_8_16_read_i2c NULL
148 int (*write)(struct snd_soc_codec *codec, unsigned int, unsigned int);
149 int (*spi_write)(void *, const char *, int);
150 unsigned int (*read)(struct snd_soc_codec *, unsigned int);
151 unsigned int (*i2c_read)(struct snd_soc_codec *, unsigned int);
153 { 7, 9, snd_soc_7_9_write, snd_soc_7_9_spi_write, snd_soc_7_9_read },
154 { 8, 16, snd_soc_8_16_write, NULL, snd_soc_8_16_read,
155 snd_soc_8_16_read_i2c },
159 * snd_soc_codec_set_cache_io: Set up standard I/O functions.
161 * @codec: CODEC to configure.
162 * @type: Type of cache.
163 * @addr_bits: Number of bits of register address data.
164 * @data_bits: Number of bits of data per register.
165 * @control: Control bus used.
167 * Register formats are frequently shared between many I2C and SPI
168 * devices. In order to promote code reuse the ASoC core provides
169 * some standard implementations of CODEC read and write operations
170 * which can be set up using this function.
172 * The caller is responsible for allocating and initialising the
175 * Note that at present this code cannot be used by CODECs with
176 * volatile registers.
178 int snd_soc_codec_set_cache_io(struct snd_soc_codec *codec,
179 int addr_bits, int data_bits,
180 enum snd_soc_control_type control)
184 for (i = 0; i < ARRAY_SIZE(io_types); i++)
185 if (io_types[i].addr_bits == addr_bits &&
186 io_types[i].data_bits == data_bits)
188 if (i == ARRAY_SIZE(io_types)) {
190 "No I/O functions for %d bit address %d bit data\n",
191 addr_bits, data_bits);
195 codec->write = io_types[i].write;
196 codec->read = io_types[i].read;
203 #if defined(CONFIG_I2C) || (defined(CONFIG_I2C_MODULE) && defined(MODULE))
204 codec->hw_write = (hw_write_t)i2c_master_send;
206 if (io_types[i].i2c_read)
207 codec->hw_read = io_types[i].i2c_read;
211 if (io_types[i].spi_write)
212 codec->hw_write = io_types[i].spi_write;
218 EXPORT_SYMBOL_GPL(snd_soc_codec_set_cache_io);