From: Wei Ni <wni@xxxxxxxxxx>
This patch adds suspend/resume support.
Stop lm90 in suspend, and run it in resume.
Signed-off-by: Wei Ni <wni@xxxxxxxxxx>
---
drivers/hwmon/lm90.c | 36 ++++++++++++++++++++++++++++++++++++
1 files changed, 36 insertions(+), 0 deletions(-)
diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c
index 2f94f95..1c2ee3f 100644
--- a/drivers/hwmon/lm90.c
+++ b/drivers/hwmon/lm90.c
@@ -1085,6 +1085,24 @@ static DEVICE_ATTR(pec, S_IWUSR | S_IRUGO, show_pec, set_pec);
* Real code
*/
+static void lm90_enable(struct i2c_client *client)
+{
+ u8 value;
+
+ lm90_read_reg(client, LM90_REG_R_CONFIG1, &value);
+ value &= ~0x40;
+ i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, value);
+}
+
+static void lm90_disable(struct i2c_client *client)
+{
+ u8 value;
+
+ lm90_read_reg(client, LM90_REG_R_CONFIG1, &value);
+ value |= 0x40;
+ i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, value);
+}
+
/* Return 0 if detection is successful, -ENODEV otherwise */
static int lm90_detect(struct i2c_client *new_client,
struct i2c_board_info *info)
@@ -1482,6 +1500,20 @@ static void lm90_alert(struct i2c_client *client, unsigned int flag)
}
}
+#ifdef CONFIG_PM
+static int lm90_suspend(struct i2c_client *client, pm_message_t state)
+{
+ lm90_disable(client);
+ return 0;
+}
+
+static int lm90_resume(struct i2c_client *client)
+{
+ lm90_enable(client);
+ return 0;
+}
+#endif
+
static struct i2c_driver lm90_driver = {
.class = I2C_CLASS_HWMON,
.driver = {
@@ -1493,6 +1525,10 @@ static struct i2c_driver lm90_driver = {
.id_table = lm90_id,
.detect = lm90_detect,
.address_list = normal_i2c,
+#ifdef CONFIG_PM
+ .suspend = lm90_suspend,
+ .resume = lm90_resume,
+#endif
};
static int __init sensors_lm90_init(void)
--
1.7.0
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