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authorAlexander Koch <mail@alexanderkoch.net>2017-01-06 13:38:17 +0300
committerGuenter Roeck <linux@roeck-us.net>2017-01-10 20:15:00 +0300
commitc72eeabd0ca8291e6e8d9ec3bb93c70125445a5d (patch)
treed61ca55f2cbf6844064d3759716245369801c5d4 /drivers/hwmon/adc128d818.c
parent4e1796c892136f9a020f629da39076afd6b50429 (diff)
downloadlinux-c72eeabd0ca8291e6e8d9ec3bb93c70125445a5d.tar.xz
hwmon: (adc128d818) Preserve operation mode
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>
Diffstat (limited to 'drivers/hwmon/adc128d818.c')
-rw-r--r--drivers/hwmon/adc128d818.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/hwmon/adc128d818.c b/drivers/hwmon/adc128d818.c
index 0502af963f73..bbe3a5c5b3f5 100644
--- a/drivers/hwmon/adc128d818.c
+++ b/drivers/hwmon/adc128d818.c
@@ -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;