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authorShubhrajyoti Datta <shubhrajyoti@ti.com>2010-08-14 21:08:50 +0200
committerJean Delvare <khali@linux-fr.org>2010-08-14 21:08:50 +0200
commit9914518e79800c977e20eda1335d43a4df813e3d (patch)
tree48cc84975364ad67932b184722dce594a67650de /drivers
parent960f12f4d1eb5ba3c76dc6b57a909a65dd59e1c2 (diff)
downloadop-kernel-dev-9914518e79800c977e20eda1335d43a4df813e3d.zip
op-kernel-dev-9914518e79800c977e20eda1335d43a4df813e3d.tar.gz
hwmon: (lm75) Add suspend/resume feature
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 Datta <shubhrajyoti@ti.com> Signed-off-by: Jean Delvare <khali@linux-fr.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/hwmon/lm75.c39
-rw-r--r--drivers/hwmon/lm75.h1
2 files changed, 40 insertions, 0 deletions
diff --git a/drivers/hwmon/lm75.c b/drivers/hwmon/lm75.c
index 393f354..ab5b87a 100644
--- a/drivers/hwmon/lm75.c
+++ b/drivers/hwmon/lm75.c
@@ -280,10 +280,49 @@ 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;
+}
+
+static const struct dev_pm_ops lm75_dev_pm_ops = {
+ .suspend = lm75_suspend,
+ .resume = lm75_resume,
+};
+#define LM75_DEV_PM_OPS (&lm75_dev_pm_ops)
+#else
+#define LM75_DEV_PM_OPS NULL
+#endif /* CONFIG_PM */
+
static struct i2c_driver lm75_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
.name = "lm75",
+ .pm = LM75_DEV_PM_OPS,
},
.probe = lm75_probe,
.remove = lm75_remove,
diff --git a/drivers/hwmon/lm75.h b/drivers/hwmon/lm75.h
index 7c93454..e547a3e 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 0x01
/* TEMP: 0.001C/bit (-55C to +125C)
REG: (0.5C/bit, two's complement) << 7 */
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