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Commit 3e0f964f authored by Wei Ni's avatar Wei Ni Committed by Jean Delvare
Browse files

hwmon: (lm90) Add power control 



The device lm90 can be controlled by the vcc rail.
Adding the regulator support to power on/off the vcc rail.
Enable the "vcc" regulator before accessing the device.

[JD: Rename variables to avoid confusion with registers.]

Signed-off-by: default avatarWei Ni <wni@nvidia.com>
Signed-off-by: default avatarJean Delvare <khali@linux-fr.org>
parent 1daaceb2

drivers/hwmon/lm90.c

+19 −0
Original line number Diff line number Diff line
@@ -95,6 +95,7 @@ 
#include <linux/mutex.h>

#include <linux/sysfs.h>

#include <linux/interrupt.h>

#include <linux/regulator/consumer.h>



/*

 * Addresses to scan
@@ -366,6 +367,7 @@ enum lm90_temp11_reg_index { 
struct lm90_data {

	struct device *hwmon_dev;

	struct mutex update_lock;

	struct regulator *regulator;

	char valid; /* zero until following fields are valid */

	unsigned long last_updated; /* in jiffies */

	int kind;
@@ -1516,8 +1518,20 @@ static int lm90_probe(struct i2c_client *client, 
	struct device *dev = &client->dev;

	struct i2c_adapter *adapter = to_i2c_adapter(dev->parent);

	struct lm90_data *data;

	struct regulator *regulator;

	int err;



	regulator = devm_regulator_get(dev, "vcc");

	if (IS_ERR(regulator))

		return PTR_ERR(regulator);



	err = regulator_enable(regulator);

	if (err < 0) {

		dev_err(&client->dev,

			"Failed to enable regulator: %d\n", err);

		return err;

	}



	data = devm_kzalloc(&client->dev, sizeof(struct lm90_data), GFP_KERNEL);

	if (!data)

		return -ENOMEM;
@@ -1525,6 +1539,8 @@ static int lm90_probe(struct i2c_client *client, 
	i2c_set_clientdata(client, data);

	mutex_init(&data->update_lock);



	data->regulator = regulator;



	/* Set the device type */

	data->kind = id->driver_data;

	if (data->kind == adm1032) {
@@ -1604,6 +1620,8 @@ exit_remove_files: 
	lm90_remove_files(client, data);

exit_restore:

	lm90_restore_conf(client, data);

	regulator_disable(data->regulator);



	return err;

}
@@ -1614,6 +1632,7 @@ static int lm90_remove(struct i2c_client *client) 
	hwmon_device_unregister(data->hwmon_dev);

	lm90_remove_files(client, data);

	lm90_restore_conf(client, data);

	regulator_disable(data->regulator);



	return 0;

}