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authorAlban Bedel <alban.bedel@aerq.com>2020-10-01 16:57:38 +0200
committerGuenter Roeck <linux@roeck-us.net>2020-10-04 08:40:10 -0700
commit707d151bd1ac4062796b95f9f6c32309ce69888c (patch)
treeb357dc78b31ca03b52473af60cb83ba44beb032c /drivers/hwmon/lm75.c
parent865e4fc013ba58cc3245fc1180033ee52e9c426e (diff)
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: 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>
Diffstat (limited to 'drivers/hwmon/lm75.c')
-rw-r--r--drivers/hwmon/lm75.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/hwmon/lm75.c b/drivers/hwmon/lm75.c
index e22f977942b4..e447febd121a 100644
--- a/drivers/hwmon/lm75.c
+++ b/drivers/hwmon/lm75.c
@@ -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) {