As part of this refactoring the type of the CODEC hw_read operation is changed to match the regular read operation.
Signed-off-by: Mark Brown broonie@opensource.wolfsonmicro.com --- include/sound/soc.h | 2 +- sound/soc/soc-cache.c | 79 ++++++++++++++++++++++++++++++++++++++++++++----- 2 files changed, 72 insertions(+), 9 deletions(-)
diff --git a/include/sound/soc.h b/include/sound/soc.h index d0b29a5..4a5846e 100644 --- a/include/sound/soc.h +++ b/include/sound/soc.h @@ -373,7 +373,7 @@ struct snd_soc_codec { size_t, unsigned int); int (*volatile_register)(unsigned int); hw_write_t hw_write; - hw_read_t hw_read; + unsigned int (*hw_read)(struct snd_soc_codec *, unsigned int); void *reg_cache; short reg_cache_size; short reg_cache_step; diff --git a/sound/soc/soc-cache.c b/sound/soc/soc-cache.c index 8b12668..ab058b8 100644 --- a/sound/soc/soc-cache.c +++ b/sound/soc/soc-cache.c @@ -46,14 +46,82 @@ static int snd_soc_7_9_write(struct snd_soc_codec *codec, unsigned int reg, return -EIO; }
+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->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)) + return codec->hw_read(codec, reg); + else + return cache[reg]; +} + +#if defined(CONFIG_I2C) || defined(CONFIG_I2C_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
static struct { int addr_bits; int data_bits; - int (*write)(struct snd_soc_codec *, unsigned int, unsigned int); + int (*write)(struct snd_soc_codec *codec, unsigned int, unsigned int); unsigned int (*read)(struct snd_soc_codec *, unsigned int); + unsigned int (*i2c_read)(struct snd_soc_codec *, unsigned int); } io_types[] = { { 7, 9, snd_soc_7_9_write, snd_soc_7_9_read }, + { 8, 16, + snd_soc_8_16_write, snd_soc_8_16_read, + snd_soc_8_16_read_i2c }, };
/** @@ -82,13 +150,6 @@ int snd_soc_codec_set_cache_io(struct snd_soc_codec *codec, { int i;
- /* We don't support volatile registers yet - refactoring of - * the hw_read operation will be required to do so. */ - if (codec->volatile_register) { - printk(KERN_ERR "Volatile registers not yet supported\n"); - return -EINVAL; - } - for (i = 0; i < ARRAY_SIZE(io_types); i++) if (io_types[i].addr_bits == addr_bits && io_types[i].data_bits == data_bits) @@ -111,6 +172,8 @@ int snd_soc_codec_set_cache_io(struct snd_soc_codec *codec, #if defined(CONFIG_I2C) || defined(CONFIG_I2C_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: