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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>
This commit is contained in:
Jean Delvare 2010-10-28 20:31:46 +02:00 committed by Jean Delvare
parent 86ef4d2fd5
commit 80646b9586
1 changed files with 10 additions and 3 deletions
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13
drivers/hwmon/w83795.c
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@ -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)