There is a shutdown feature at suspend it can be enabled
to reduce current consumption and resume it can be switched
off.
Signed-off-by: Shubhrajyoti D <shubhrajyoti@xxxxxx>
---
drivers/hwmon/lm75.c | 35 +++++++++++++++++++++++++++++++++++
drivers/hwmon/lm75.h | 1 +
2 files changed, 36 insertions(+), 0 deletions(-)
diff --git a/drivers/hwmon/lm75.c b/drivers/hwmon/lm75.c
index 5646342..4ef1f59 100644
--- a/drivers/hwmon/lm75.c
+++ b/drivers/hwmon/lm75.c
@@ -281,6 +281,39 @@ static int lm75_detect(struct i2c_client *new_client,
return 0;
}
+#ifdef CONFIG_PM
+static int lm75_suspend(struct device *dev)
+{
+ int status;
+ struct i2c_client *client = to_i2c_client(dev);
+ status = lm75_read_value(client, LM75_REG_CONF);
+ if (status < 0) {
+ dev_dbg(&client->dev, "Can't read config? %d\n", status);
+ return status;
+ }
+ status = status | LM75_SHUTDOWN;
+ lm75_write_value(client, LM75_REG_CONF, status);
+ return 0;
+}
+
+static int lm75_resume(struct device *dev)
+{
+ int status;
+ struct i2c_client *client = to_i2c_client(dev);
+ status = lm75_read_value(client, LM75_REG_CONF);
+ if (status < 0) {
+ dev_dbg(&client->dev, "Can't read config? %d\n", status);
+ return status;
+ }
+ status = status & ~LM75_SHUTDOWN;
+ lm75_write_value(client, LM75_REG_CONF, status);
+ return 0;
+}
+#else
+#define lm75_suspend NULL
+#define lm75_resume NULL
+#endif /* CONFIG_PM */
+
static struct i2c_driver lm75_driver = {
.class = I2C_CLASS_HWMON,
@@ -292,6 +325,8 @@ static struct i2c_driver lm75_driver = {
.id_table = lm75_ids,
.detect = lm75_detect,
.address_list = normal_i2c,
+ .suspend = lm75_suspend,
+ .resume = lm75_resume,
};
/*-----------------------------------------------------------------------*/
diff --git a/drivers/hwmon/lm75.h b/drivers/hwmon/lm75.h
index 7c93454..8e14253 100644
--- a/drivers/hwmon/lm75.h
+++ b/drivers/hwmon/lm75.h
@@ -30,6 +30,7 @@
/* straight from the datasheet */
#define LM75_TEMP_MIN (-55000)
#define LM75_TEMP_MAX 125000
+#define LM75_SHUTDOWN 1
/* TEMP: 0.001C/bit (-55C to +125C)
REG: (0.5C/bit, two's complement) << 7 */
--
1.5.4.7
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