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hwmon: (adc128d818) Preserve operation mode

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Preserve chip operation mode if no mode is specified via devicetree. This
enables operation when chip configuration is done by BIOS/ROMMON.

Signed-off-by: Alexander Koch <mail@alexanderkoch.net>
Acked-by: Michael Hornung <mhornung.linux@gmail.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Alexander Koch 2017-01-06 11:38:17 +01:00 committed by Guenter Roeck
parent 4e1796c892
commit c72eeabd0c
1 changed files with 5 additions and 2 deletions
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7
drivers/hwmon/adc128d818.c
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@ -491,7 +491,7 @@ static int adc128_probe(struct i2c_client *client,
data->vref = 2560; /* 2.56V, in mV */
}
/* Operation mode is optional and defaults to mode 0 */
/* Operation mode is optional. If unspecified, keep current mode */
if (of_property_read_u8(dev->of_node, "ti,mode", &data->mode) == 0) {
if (data->mode > 3) {
dev_err(dev, "invalid operation mode %d\n",
@ -500,7 +500,10 @@ static int adc128_probe(struct i2c_client *client,
goto error;
}
} else {
data->mode = 0;
err = i2c_smbus_read_byte_data(client, ADC128_REG_CONFIG_ADV);
if (err < 0)
goto error;
data->mode = (err >> 1) & ADC128_REG_MASK;
}
data->client = client;