Commit 707d151b authored by Alban Bedel's avatar Alban Bedel Committed by Guenter Roeck
Browse files

hwmon: (lm75) Add regulator support 



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

Signed-off-by: default avatarAlban Bedel <alban.bedel@aerq.com>
Link: https://lore.kernel.org/r/20201001145738.17326-4-alban.bedel@aerq.com


Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
parent 865e4fc0

drivers/hwmon/lm75.c

+24 −0
Original line number Diff line number Diff line
@@ -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) {