From: Tomas Novotny <tomas@xxxxxxxxxx>
Use a standard framework to get the reference voltage. It is done that way
in the iio subsystem and it will simplify extending of the driver.
Structure mcp4725_platform_data is left undeleted because it used in the
next patch.
This change breaks the current users of the driver, but there is no
mainline user of struct mcp4725_platform_data.
Signed-off-by: Tomas Novotny <tomas@xxxxxxxxxx>
---
drivers/iio/dac/mcp4725.c | 45 ++++++++++++++++++++++++++++++++---------
include/linux/iio/dac/mcp4725.h | 1 -
2 files changed, 36 insertions(+), 10 deletions(-)
diff --git a/drivers/iio/dac/mcp4725.c b/drivers/iio/dac/mcp4725.c
index cca935c..1f55d1b 100644
--- a/drivers/iio/dac/mcp4725.c
+++ b/drivers/iio/dac/mcp4725.c
@@ -18,6 +18,7 @@
#include <linux/i2c.h>
#include <linux/err.h>
#include <linux/delay.h>
+#include <linux/regulator/consumer.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
@@ -28,10 +29,10 @@
struct mcp4725_data {
struct i2c_client *client;
- u16 vref_mv;
u16 dac_value;
bool powerdown;
unsigned powerdown_mode;
+ struct regulator *vdd_reg;
};
static int mcp4725_suspend(struct device *dev)
@@ -283,13 +284,18 @@ static int mcp4725_read_raw(struct iio_dev *indio_dev,
int *val, int *val2, long mask)
{
struct mcp4725_data *data = iio_priv(indio_dev);
+ int ret;
switch (mask) {
case IIO_CHAN_INFO_RAW:
*val = data->dac_value;
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
- *val = data->vref_mv;
+ ret = regulator_get_voltage(data->vdd_reg);
+ if (ret < 0)
+ return ret;
+
+ *val = ret / 1000;
*val2 = 12;
return IIO_VAL_FRACTIONAL_LOG2;
}
@@ -328,12 +334,12 @@ static int mcp4725_probe(struct i2c_client *client,
{
struct mcp4725_data *data;
struct iio_dev *indio_dev;
- struct mcp4725_platform_data *platform_data = client->dev.platform_data;
+ struct mcp4725_platform_data *pdata = dev_get_platdata(&client->dev);
u8 inbuf[3];
u8 pd;
int err;
- if (!platform_data || !platform_data->vref_mv) {
+ if (!pdata) {
dev_err(&client->dev, "invalid platform data");
return -EINVAL;
}
@@ -345,6 +351,14 @@ static int mcp4725_probe(struct i2c_client *client,
i2c_set_clientdata(client, indio_dev);
data->client = client;
+ data->vdd_reg = devm_regulator_get(&client->dev, "vdd");
+ if (IS_ERR(data->vdd_reg))
+ return PTR_ERR(data->vdd_reg);
+
+ err = regulator_enable(data->vdd_reg);
+ if (err)
+ return err;
+
indio_dev->dev.parent = &client->dev;
indio_dev->name = id->name;
indio_dev->info = &mcp4725_info;
@@ -352,25 +366,38 @@ static int mcp4725_probe(struct i2c_client *client,
indio_dev->num_channels = 1;
indio_dev->modes = INDIO_DIRECT_MODE;
- data->vref_mv = platform_data->vref_mv;
-
/* read current DAC value */
err = i2c_master_recv(client, inbuf, 3);
if (err < 0) {
dev_err(&client->dev, "failed to read DAC value");
- return err;
+ goto err_disable_vdd_reg;
}
pd = (inbuf[0] >> 1) & 0x3;
data->powerdown = pd > 0 ? true : false;
data->powerdown_mode = pd ? pd - 1 : 2; /* largest register to gnd */
data->dac_value = (inbuf[1] << 4) | (inbuf[2] >> 4);
- return iio_device_register(indio_dev);
+ err = iio_device_register(indio_dev);
+ if (err)
+ goto err_disable_vdd_reg;
+
+ return 0;
+
+err_disable_vdd_reg:
+ regulator_disable(data->vdd_reg);
+
+ return err;
}
static int mcp4725_remove(struct i2c_client *client)
{
- iio_device_unregister(i2c_get_clientdata(client));
+ struct iio_dev *indio_dev = i2c_get_clientdata(client);
+ struct mcp4725_data *data = iio_priv(indio_dev);
+
+ iio_device_unregister(indio_dev);
+
+ regulator_disable(data->vdd_reg);
+
return 0;
}
diff --git a/include/linux/iio/dac/mcp4725.h b/include/linux/iio/dac/mcp4725.h
index 91530e6..7c062e8 100644
--- a/include/linux/iio/dac/mcp4725.h
+++ b/include/linux/iio/dac/mcp4725.h
@@ -10,7 +10,6 @@
#define IIO_DAC_MCP4725_H_
struct mcp4725_platform_data {
- u16 vref_mv;
};
#endif /* IIO_DAC_MCP4725_H_ */
--
2.1.4
--
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