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hwmon: (lm75) Add regulator support

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Add regulator support for boards where the sensor first need to be
powered up before it can be used.

Signed-off-by: Alban Bedel <alban.bedel@aerq.com>
Link: https://lore.kernel.org/r/20201001145738.17326-4-alban.bedel@aerq.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Alban Bedel 2020-10-01 16:57:38 +02:00 committed by Guenter Roeck
parent 865e4fc013
commit 707d151bd1
1 changed files with 24 additions and 0 deletions
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24
drivers/hwmon/lm75.c
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@ -17,6 +17,7 @@
#include <linux/of.h>
#include <linux/regmap.h>
#include <linux/util_macros.h>
#include <linux/regulator/consumer.h>
#include "lm75.h"
/*
@ -101,6 +102,7 @@ static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, 0x4c,
struct lm75_data {
struct i2c_client *client;
struct regmap *regmap;
struct regulator *vs;
u8 orig_conf;
u8 current_conf;
u8 resolution; /* In bits, 9 to 16 */
@ -534,6 +536,13 @@ static const struct regmap_config lm75_regmap_config = {
.use_single_write = true,
};
static void lm75_disable_regulator(void *data)
{
struct lm75_data *lm75 = data;
regulator_disable(lm75->vs);
}
static void lm75_remove(void *data)
{
struct lm75_data *lm75 = data;
@ -568,6 +577,10 @@ static int lm75_probe(struct i2c_client *client)
data->client = client;
data->kind = kind;
data->vs = devm_regulator_get(dev, "vs");
if (IS_ERR(data->vs))
return PTR_ERR(data->vs);
data->regmap = devm_regmap_init_i2c(client, &lm75_regmap_config);
if (IS_ERR(data->regmap))
return PTR_ERR(data->regmap);
@ -582,6 +595,17 @@ static int lm75_probe(struct i2c_client *client)
data->sample_time = data->params->default_sample_time;
data->resolution = data->params->default_resolution;
/* Enable the power */
err = regulator_enable(data->vs);
if (err) {
dev_err(dev, "failed to enable regulator: %d\n", err);
return err;
}
err = devm_add_action_or_reset(dev, lm75_disable_regulator, data);
if (err)
return err;
/* Cache original configuration */
status = i2c_smbus_read_byte_data(client, LM75_REG_CONF);
if (status < 0) {