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.
Signed-off-by: Wei Ni <wni@xxxxxxxxxx>
---
drivers/hwmon/lm90.c | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c
index cdff742..bd313f4 100644
--- a/drivers/hwmon/lm90.c
+++ b/drivers/hwmon/lm90.c
@@ -89,6 +89,8 @@
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/sysfs.h>
+#include <linux/regulator/consumer.h>
+#include <linux/delay.h>
/*
* Addresses to scan
@@ -302,6 +304,7 @@ static const struct lm90_params lm90_params[] = {
struct lm90_data {
struct device *hwmon_dev;
struct mutex update_lock;
+ struct regulator *lm90_reg;
char valid; /* zero until following fields are valid */
unsigned long last_updated; /* in jiffies */
int kind;
@@ -1397,8 +1400,23 @@ 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 *reg;
int err;
+ reg = devm_regulator_get_optional(dev, "vcc");
+ if (!IS_ERR(reg)) {
+ err = regulator_enable(reg);
+ if (err < 0) {
+ dev_err(&client->dev,
+ "Failed to enable regulator: %d\n", err);
+ return err;
+ }
+ msleep(25);
+ } else {
+ if (PTR_ERR(reg) == -EPROBE_DEFER)
+ return -EPROBE_DEFER;
+ }
+
data = devm_kzalloc(&client->dev, sizeof(struct lm90_data), GFP_KERNEL);
if (!data)
return -ENOMEM;
@@ -1406,6 +1424,8 @@ static int lm90_probe(struct i2c_client *client,
i2c_set_clientdata(client, data);
mutex_init(&data->update_lock);
+ data->lm90_reg = reg;
+
/* Set the device type */
data->kind = id->driver_data;
if (data->kind == adm1032) {
@@ -1473,6 +1493,9 @@ exit_remove_files:
lm90_remove_files(client, data);
exit_restore:
lm90_restore_conf(client, data);
+ if (!IS_ERR(data->lm90_reg))
+ regulator_disable(data->lm90_reg);
+
return err;
}
@@ -1483,6 +1506,8 @@ static int lm90_remove(struct i2c_client *client)
hwmon_device_unregister(data->hwmon_dev);
lm90_remove_files(client, data);
lm90_restore_conf(client, data);
+ if (!IS_ERR(data->lm90_reg))
+ regulator_disable(data->lm90_reg);
return 0;
}
--
1.7.9.5
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