This saves an SMBus write if monitoring was already enabled.
Signed-off-by: Jean Delvare <khali@xxxxxxxxxxxx>
---
drivers/hwmon/w83795.c | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)
--- linux-2.6.36-rc4.orig/drivers/hwmon/w83795.c 2010-09-15 15:12:45.000000000 +0200
+++ linux-2.6.36-rc4/drivers/hwmon/w83795.c 2010-09-15 15:12:48.000000000 +0200
@@ -55,6 +55,7 @@ MODULE_PARM_DESC(reset, "Set to 1 to res
#define W83795_REG_I2C_ADDR 0xfc
#define W83795_REG_CONFIG 0x01
#define W83795_REG_CONFIG_CONFIG48 0x04
+#define W83795_REG_CONFIG_START 0x01
/* Multi-Function Pin Ctrl Registers */
#define W83795_REG_VOLT_CTRL1 0x02
@@ -1664,12 +1665,18 @@ static const struct sensor_device_attrib
static void w83795_init_client(struct i2c_client *client)
{
+ u8 config;
+
if (reset)
w83795_write(client, W83795_REG_CONFIG, 0x80);
- /* Start monitoring */
- w83795_write(client, W83795_REG_CONFIG,
- w83795_read(client, W83795_REG_CONFIG) | 0x01);
+ /* Start monitoring if needed */
+ config = w83795_read(client, W83795_REG_CONFIG);
+ if (!(config & W83795_REG_CONFIG_START)) {
+ dev_info(&client->dev, "Enabling monitoring operations\n");
+ w83795_write(client, W83795_REG_CONFIG,
+ config | W83795_REG_CONFIG_START);
+ }
}
static int w83795_get_device_id(struct i2c_client *client)
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