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ASoC: tas5086: open-code I2C transfer routines

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In order to support registers of unequal sizes, the I2C I/O has to be
open-coded.

Signed-off-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Daniel Mack 2013-06-24 16:25:29 +02:00 committed by Mark Brown
parent 9e895ace5d
commit 6b36d370ad
1 changed files with 84 additions and 1 deletions
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85
sound/soc/codecs/tas5086.c
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@ -119,6 +119,17 @@ static const struct reg_default tas5086_reg_defaults[] = {
{ 0x1c, 0x05 },
};
static int tas5086_register_size(struct device *dev, unsigned int reg)
{
switch (reg) {
case TAS5086_DEV_ID ... TAS5086_BKNDERR:
return 1;
}
dev_err(dev, "Unsupported register address: %d\n", reg);
return 0;
}
static bool tas5086_accessible_reg(struct device *dev, unsigned int reg)
{
return !((reg == 0x0f) || (reg >= 0x11 && reg <= 0x17));
@ -140,6 +151,76 @@ static bool tas5086_writeable_reg(struct device *dev, unsigned int reg)
return tas5086_accessible_reg(dev, reg) && (reg != TAS5086_DEV_ID);
}
static int tas5086_reg_write(void *context, unsigned int reg,
unsigned int value)
{
struct i2c_client *client = context;
unsigned int i, size;
uint8_t buf[5];
int ret;
size = tas5086_register_size(&client->dev, reg);
if (size == 0)
return -EINVAL;
buf[0] = reg;
for (i = size; i >= 1; --i) {
buf[i] = value;
value >>= 8;
}
ret = i2c_master_send(client, buf, size + 1);
if (ret == size + 1)
return 0;
else if (ret < 0)
return ret;
else
return -EIO;
}
static int tas5086_reg_read(void *context, unsigned int reg,
unsigned int *value)
{
struct i2c_client *client = context;
uint8_t send_buf, recv_buf[4];
struct i2c_msg msgs[2];
unsigned int size;
unsigned int i;
int ret;
size = tas5086_register_size(&client->dev, reg);
if (size == 0)
return -EINVAL;
send_buf = reg;
msgs[0].addr = client->addr;
msgs[0].len = sizeof(send_buf);
msgs[0].buf = &send_buf;
msgs[0].flags = 0;
msgs[1].addr = client->addr;
msgs[1].len = size;
msgs[1].buf = recv_buf;
msgs[1].flags = I2C_M_RD;
ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
if (ret < 0)
return ret;
else if (ret != ARRAY_SIZE(msgs))
return -EIO;
*value = 0;
for (i = 0; i < size; i++) {
*value <<= 8;
*value |= recv_buf[i];
}
return 0;
}
struct tas5086_private {
struct regmap *regmap;
unsigned int mclk, sclk;
@ -508,6 +589,8 @@ static const struct regmap_config tas5086_regmap = {
.volatile_reg = tas5086_volatile_reg,
.writeable_reg = tas5086_writeable_reg,
.readable_reg = tas5086_accessible_reg,
.reg_read = tas5086_reg_read,
.reg_write = tas5086_reg_write,
};
static int tas5086_i2c_probe(struct i2c_client *i2c,
@ -522,7 +605,7 @@ static int tas5086_i2c_probe(struct i2c_client *i2c,
if (!priv)
return -ENOMEM;
priv->regmap = devm_regmap_init_i2c(i2c, &tas5086_regmap);
priv->regmap = devm_regmap_init(dev, NULL, i2c, &tas5086_regmap);
if (IS_ERR(priv->regmap)) {
ret = PTR_ERR(priv->regmap);
dev_err(&i2c->dev, "Failed to create regmap: %d\n", ret);