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_4_12_read(struct snd_soc_codec *codec,
21 u16 *cache = codec->reg_cache;
22 if (reg >= codec->reg_cache_size)
27 static int snd_soc_4_12_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 << 4) | ((value >> 8) & 0x000f);
37 data[1] = value & 0x00ff;
39 if (reg < codec->reg_cache_size)
42 if (codec->cache_only) {
43 codec->cache_sync = 1;
47 dev_dbg(codec->dev, "0x%x = 0x%x\n", reg, value);
49 ret = codec->hw_write(codec->control_data, data, 2);
58 #if defined(CONFIG_SPI_MASTER)
59 static int snd_soc_4_12_spi_write(void *control_data, const char *data,
62 struct spi_device *spi = control_data;
63 struct spi_transfer t;
74 memset(&t, 0, (sizeof t));
79 spi_message_add_tail(&t, &m);
85 #define snd_soc_4_12_spi_write NULL
88 static unsigned int snd_soc_7_9_read(struct snd_soc_codec *codec,
91 u16 *cache = codec->reg_cache;
92 if (reg >= codec->reg_cache_size)
97 static int snd_soc_7_9_write(struct snd_soc_codec *codec, unsigned int reg,
100 u16 *cache = codec->reg_cache;
104 BUG_ON(codec->volatile_register);
106 data[0] = (reg << 1) | ((value >> 8) & 0x0001);
107 data[1] = value & 0x00ff;
109 if (reg < codec->reg_cache_size)
112 if (codec->cache_only) {
113 codec->cache_sync = 1;
117 dev_dbg(codec->dev, "0x%x = 0x%x\n", reg, value);
119 ret = codec->hw_write(codec->control_data, data, 2);
128 #if defined(CONFIG_SPI_MASTER)
129 static int snd_soc_7_9_spi_write(void *control_data, const char *data,
132 struct spi_device *spi = control_data;
133 struct spi_transfer t;
134 struct spi_message m;
143 spi_message_init(&m);
144 memset(&t, 0, (sizeof t));
149 spi_message_add_tail(&t, &m);
155 #define snd_soc_7_9_spi_write NULL
158 static int snd_soc_8_8_write(struct snd_soc_codec *codec, unsigned int reg,
161 u8 *cache = codec->reg_cache;
164 BUG_ON(codec->volatile_register);
168 data[1] = value & 0xff;
170 if (reg < codec->reg_cache_size)
173 if (codec->cache_only) {
174 codec->cache_sync = 1;
178 dev_dbg(codec->dev, "0x%x = 0x%x\n", reg, value);
180 if (codec->hw_write(codec->control_data, data, 2) == 2)
186 static unsigned int snd_soc_8_8_read(struct snd_soc_codec *codec,
189 u8 *cache = codec->reg_cache;
191 if (reg >= codec->reg_cache_size)
196 static int snd_soc_8_16_write(struct snd_soc_codec *codec, unsigned int reg,
199 u16 *reg_cache = codec->reg_cache;
203 data[1] = (value >> 8) & 0xff;
204 data[2] = value & 0xff;
206 if (!snd_soc_codec_volatile_register(codec, reg))
207 reg_cache[reg] = value;
209 if (codec->cache_only) {
210 codec->cache_sync = 1;
214 dev_dbg(codec->dev, "0x%x = 0x%x\n", reg, value);
216 if (codec->hw_write(codec->control_data, data, 3) == 3)
222 static unsigned int snd_soc_8_16_read(struct snd_soc_codec *codec,
225 u16 *cache = codec->reg_cache;
227 if (reg >= codec->reg_cache_size ||
228 snd_soc_codec_volatile_register(codec, reg)) {
229 if (codec->cache_only)
232 return codec->hw_read(codec, reg);
238 #if defined(CONFIG_I2C) || (defined(CONFIG_I2C_MODULE) && defined(MODULE))
239 static unsigned int snd_soc_8_8_read_i2c(struct snd_soc_codec *codec,
242 struct i2c_msg xfer[2];
246 struct i2c_client *client = codec->control_data;
249 xfer[0].addr = client->addr;
255 xfer[1].addr = client->addr;
256 xfer[1].flags = I2C_M_RD;
260 ret = i2c_transfer(client->adapter, xfer, 2);
262 dev_err(&client->dev, "i2c_transfer() returned %d\n", ret);
269 #define snd_soc_8_8_read_i2c NULL
272 #if defined(CONFIG_I2C) || (defined(CONFIG_I2C_MODULE) && defined(MODULE))
273 static unsigned int snd_soc_8_16_read_i2c(struct snd_soc_codec *codec,
276 struct i2c_msg xfer[2];
280 struct i2c_client *client = codec->control_data;
283 xfer[0].addr = client->addr;
289 xfer[1].addr = client->addr;
290 xfer[1].flags = I2C_M_RD;
292 xfer[1].buf = (u8 *)&data;
294 ret = i2c_transfer(client->adapter, xfer, 2);
296 dev_err(&client->dev, "i2c_transfer() returned %d\n", ret);
300 return (data >> 8) | ((data & 0xff) << 8);
303 #define snd_soc_8_16_read_i2c NULL
306 #if defined(CONFIG_I2C) || (defined(CONFIG_I2C_MODULE) && defined(MODULE))
307 static unsigned int snd_soc_16_8_read_i2c(struct snd_soc_codec *codec,
310 struct i2c_msg xfer[2];
314 struct i2c_client *client = codec->control_data;
317 xfer[0].addr = client->addr;
320 xfer[0].buf = (u8 *)®
323 xfer[1].addr = client->addr;
324 xfer[1].flags = I2C_M_RD;
328 ret = i2c_transfer(client->adapter, xfer, 2);
330 dev_err(&client->dev, "i2c_transfer() returned %d\n", ret);
337 #define snd_soc_16_8_read_i2c NULL
340 static unsigned int snd_soc_16_8_read(struct snd_soc_codec *codec,
343 u8 *cache = codec->reg_cache;
346 if (reg >= codec->reg_cache_size)
351 static int snd_soc_16_8_write(struct snd_soc_codec *codec, unsigned int reg,
354 u8 *cache = codec->reg_cache;
358 BUG_ON(codec->volatile_register);
360 data[0] = (reg >> 8) & 0xff;
361 data[1] = reg & 0xff;
365 if (reg < codec->reg_cache_size)
368 if (codec->cache_only) {
369 codec->cache_sync = 1;
373 dev_dbg(codec->dev, "0x%x = 0x%x\n", reg, value);
375 ret = codec->hw_write(codec->control_data, data, 3);
384 #if defined(CONFIG_SPI_MASTER)
385 static int snd_soc_16_8_spi_write(void *control_data, const char *data,
388 struct spi_device *spi = control_data;
389 struct spi_transfer t;
390 struct spi_message m;
400 spi_message_init(&m);
401 memset(&t, 0, (sizeof t));
406 spi_message_add_tail(&t, &m);
412 #define snd_soc_16_8_spi_write NULL
415 #if defined(CONFIG_I2C) || (defined(CONFIG_I2C_MODULE) && defined(MODULE))
416 static unsigned int snd_soc_16_16_read_i2c(struct snd_soc_codec *codec,
419 struct i2c_msg xfer[2];
420 u16 reg = cpu_to_be16(r);
423 struct i2c_client *client = codec->control_data;
426 xfer[0].addr = client->addr;
429 xfer[0].buf = (u8 *)®
432 xfer[1].addr = client->addr;
433 xfer[1].flags = I2C_M_RD;
435 xfer[1].buf = (u8 *)&data;
437 ret = i2c_transfer(client->adapter, xfer, 2);
439 dev_err(&client->dev, "i2c_transfer() returned %d\n", ret);
443 return be16_to_cpu(data);
446 #define snd_soc_16_16_read_i2c NULL
449 static unsigned int snd_soc_16_16_read(struct snd_soc_codec *codec,
452 u16 *cache = codec->reg_cache;
454 if (reg >= codec->reg_cache_size ||
455 snd_soc_codec_volatile_register(codec, reg)) {
456 if (codec->cache_only)
459 return codec->hw_read(codec, reg);
465 static int snd_soc_16_16_write(struct snd_soc_codec *codec, unsigned int reg,
468 u16 *cache = codec->reg_cache;
472 data[0] = (reg >> 8) & 0xff;
473 data[1] = reg & 0xff;
474 data[2] = (value >> 8) & 0xff;
475 data[3] = value & 0xff;
477 if (reg < codec->reg_cache_size)
480 if (codec->cache_only) {
481 codec->cache_sync = 1;
485 dev_dbg(codec->dev, "0x%x = 0x%x\n", reg, value);
487 ret = codec->hw_write(codec->control_data, data, 4);
499 int (*write)(struct snd_soc_codec *codec, unsigned int, unsigned int);
500 int (*spi_write)(void *, const char *, int);
501 unsigned int (*read)(struct snd_soc_codec *, unsigned int);
502 unsigned int (*i2c_read)(struct snd_soc_codec *, unsigned int);
505 .addr_bits = 4, .data_bits = 12,
506 .write = snd_soc_4_12_write, .read = snd_soc_4_12_read,
507 .spi_write = snd_soc_4_12_spi_write,
510 .addr_bits = 7, .data_bits = 9,
511 .write = snd_soc_7_9_write, .read = snd_soc_7_9_read,
512 .spi_write = snd_soc_7_9_spi_write,
515 .addr_bits = 8, .data_bits = 8,
516 .write = snd_soc_8_8_write, .read = snd_soc_8_8_read,
517 .i2c_read = snd_soc_8_8_read_i2c,
520 .addr_bits = 8, .data_bits = 16,
521 .write = snd_soc_8_16_write, .read = snd_soc_8_16_read,
522 .i2c_read = snd_soc_8_16_read_i2c,
525 .addr_bits = 16, .data_bits = 8,
526 .write = snd_soc_16_8_write, .read = snd_soc_16_8_read,
527 .i2c_read = snd_soc_16_8_read_i2c,
528 .spi_write = snd_soc_16_8_spi_write,
531 .addr_bits = 16, .data_bits = 16,
532 .write = snd_soc_16_16_write, .read = snd_soc_16_16_read,
533 .i2c_read = snd_soc_16_16_read_i2c,
538 * snd_soc_codec_set_cache_io: Set up standard I/O functions.
540 * @codec: CODEC to configure.
541 * @type: Type of cache.
542 * @addr_bits: Number of bits of register address data.
543 * @data_bits: Number of bits of data per register.
544 * @control: Control bus used.
546 * Register formats are frequently shared between many I2C and SPI
547 * devices. In order to promote code reuse the ASoC core provides
548 * some standard implementations of CODEC read and write operations
549 * which can be set up using this function.
551 * The caller is responsible for allocating and initialising the
554 * Note that at present this code cannot be used by CODECs with
555 * volatile registers.
557 int snd_soc_codec_set_cache_io(struct snd_soc_codec *codec,
558 int addr_bits, int data_bits,
559 enum snd_soc_control_type control)
563 for (i = 0; i < ARRAY_SIZE(io_types); i++)
564 if (io_types[i].addr_bits == addr_bits &&
565 io_types[i].data_bits == data_bits)
567 if (i == ARRAY_SIZE(io_types)) {
569 "No I/O functions for %d bit address %d bit data\n",
570 addr_bits, data_bits);
574 codec->write = io_types[i].write;
575 codec->read = io_types[i].read;
582 #if defined(CONFIG_I2C) || (defined(CONFIG_I2C_MODULE) && defined(MODULE))
583 codec->hw_write = (hw_write_t)i2c_master_send;
585 if (io_types[i].i2c_read)
586 codec->hw_read = io_types[i].i2c_read;
590 if (io_types[i].spi_write)
591 codec->hw_write = io_types[i].spi_write;
597 EXPORT_SYMBOL_GPL(snd_soc_codec_set_cache_io);