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| author | Jean Delvare <khali@linux-fr.org> | 2010-10-28 20:31:46 +0200 |
|---|---|---|
| committer | Jean Delvare <khali@endymion.delvare> | 2010-10-28 20:31:46 +0200 |
| commit | 80646b95863ba282330d07290c79254c2f002139 (patch) | |
| tree | a990d3f36160ebb9530e8a30a237c9266f951a8c | |
| parent | 86ef4d2fd5921ff0bcfd1c0d88403a08862087bc (diff) | |
| download | linux-stable-80646b95863ba282330d07290c79254c2f002139.tar.gz linux-stable-80646b95863ba282330d07290c79254c2f002139.tar.bz2 linux-stable-80646b95863ba282330d07290c79254c2f002139.zip | |
hwmon: (w83795) Only start monitoring if needed
This saves an SMBus write if monitoring was already enabled.
Signed-off-by: Jean Delvare <khali@linux-fr.org>
| -rw-r--r-- | drivers/hwmon/w83795.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/drivers/hwmon/w83795.c b/drivers/hwmon/w83795.c index b45416011c2a..62deffcc64a3 100644 --- a/drivers/hwmon/w83795.c +++ b/drivers/hwmon/w83795.c @@ -55,6 +55,7 @@ MODULE_PARM_DESC(reset, "Set to 1 to reset chip, not recommended"); #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_attribute_2 sda_single_files[] = { 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) |