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hwmon: (lm90) Add power control

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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: Wei Ni <wni@nvidia.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
This commit is contained in:
Wei Ni 2013-11-15 10:40:39 +01:00 committed by Jean Delvare
parent 1daaceb26d
commit 3e0f964f2a
1 changed files with 19 additions and 0 deletions
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19
drivers/hwmon/lm90.c
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@ -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 @@ static int lm90_probe(struct i2c_client *client,
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;
}