[PATCH RFC 2/7] hwmon: (adc128d818) Use devm_regulator_get_optional_enable_get_voltage()

David Lechner
2024-03-27T23:19:05Z

We can reduce boilerplate code and eliminate the driver remove()
function by using devm_regulator_get_optional_enable_get_voltage().

A new external_vref flag is added since we no longer have the handle
to the regulator to check if it is present.

Signed-off-by: David Lechner <dlechner@baylibre.com>
---
drivers/hwmon/adc128d818.c | 55 ++++++++++++++--------------------------------
1 file changed, 17 insertions(+), 38 deletions(-)

diff --git a/drivers/hwmon/adc128d818.c b/drivers/hwmon/adc128d818.c
index 46e3c8c50765..119e2841720f 100644
--- a/drivers/hwmon/adc128d818.c
+++ b/drivers/hwmon/adc128d818.c
@@ -58,7 +58,6 @@ static const u8 num_inputs[] = { 7, 8, 4, 6 };

struct adc128_data {
struct i2c_client *client;
- struct regulator *regulator;
int vref; /* Reference voltage in mV */
struct mutex update_lock;
u8 mode; /* Operation mode */
@@ -389,7 +388,7 @@ static int adc128_detect(struct i2c_client *client, struct i2c_board_info *info)
return 0;
}

-static int adc128_init_client(struct adc128_data *data)
+static int adc128_init_client(struct adc128_data *data, bool external_vref)
{
struct i2c_client *client = data->client;
int err;
@@ -408,7 +407,7 @@ static int adc128_init_client(struct adc128_data *data)
regval |= data->mode << 1;

/* If external vref is selected, configure the chip to use it */
- if (data->regulator)
+ if (external_vref)
regval |= 0x01;

/* Write advanced configuration register */
@@ -430,30 +429,25 @@ static int adc128_init_client(struct adc128_data *data)
static int adc128_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
- struct regulator *regulator;
struct device *hwmon_dev;
struct adc128_data *data;
- int err, vref;
+ bool external_vref;
+ int err;

data = devm_kzalloc(dev, sizeof(struct adc128_data), GFP_KERNEL);
if (!data)
return -ENOMEM;

/* vref is optional. If specified, is used as chip reference voltage */
- regulator = devm_regulator_get_optional(dev, "vref");
- if (!IS_ERR(regulator)) {
- data->regulator = regulator;
- err = regulator_enable(regulator);
- if (err < 0)
- return err;
- vref = regulator_get_voltage(regulator);
- if (vref < 0) {
- err = vref;
- goto error;
- }
- data->vref = DIV_ROUND_CLOSEST(vref, 1000);
- } else {
+ err = devm_regulator_get_optional_enable_get_voltage(dev, "vref");
+ if (err == -ENODEV) {
+ external_vref = false;
data->vref = 2560; /* 2.56V, in mV */
+ } else if (err < 0) {
+ return err;
+ } else {
+ external_vref = true;
+ data->vref = DIV_ROUND_CLOSEST(err, 1000);
}

/* Operation mode is optional. If unspecified, keep current mode */
@@ -461,13 +455,12 @@ static int adc128_probe(struct i2c_client *client)
if (data->mode > 3) {
dev_err(dev, "invalid operation mode %d\n",
data->mode);
- err = -EINVAL;
- goto error;
+ return -EINVAL;
}
} else {
err = i2c_smbus_read_byte_data(client, ADC128_REG_CONFIG_ADV);
if (err < 0)
- goto error;
+ return err;
data->mode = (err >> 1) & ADC128_REG_MASK;
}

@@ -476,31 +469,18 @@ static int adc128_probe(struct i2c_client *client)
mutex_init(&data->update_lock);

/* Initialize the chip */
- err = adc128_init_client(data);
+ err = adc128_init_client(data, external_vref);
if (err < 0)
- goto error;
+ return err;

hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
data, adc128_groups);
if (IS_ERR(hwmon_dev)) {
err = PTR_ERR(hwmon_dev);
- goto error;
+ return err;
}

return 0;
-
-error:
- if (data->regulator)
- regulator_disable(data->regulator);
- return err;
-}
-
-static void adc128_remove(struct i2c_client *client)
-{
- struct adc128_data *data = i2c_get_clientdata(client);
-
- if (data->regulator)
- regulator_disable(data->regulator);
}

static const struct i2c_device_id adc128_id[] = {
@@ -522,7 +502,6 @@ static struct i2c_driver adc128_driver = {
.of_match_table = of_match_ptr(adc128_of_match),
},
.probe = adc128_probe,
- .remove = adc128_remove,
.id_table = adc128_id,
.detect = adc128_detect,
.address_list = normal_i2c,

--
2.43.2