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hwmon: (tmp421) support HWMON_T_ENABLE 

Since the recent patches added possibility of disabling sensor channels
via DT, it only make sense to allow controlling that from userspace via
HWMON_T_ENABLE mechanism. This patches adds support for that.

Signed-off-by: Krzysztof Adamski <krzysztof.adamski@nokia.com>
Link: https://lore.kernel.org/r/a64c22e7323bd5a083f37aaaca91a745ac1beef3.1634206677.git.krzysztof.adamski@nokia.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Krzysztof Adamski 2021-10-14 15:09:58 +02:00 committed by Guenter Roeck
parent f3fbf4b81d
commit 1a98068c71
1 changed files with 29 additions and 4 deletions
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33
drivers/hwmon/tmp421.c
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@ -203,21 +203,25 @@ static int tmp421_read(struct device *dev, enum hwmon_sensor_types type,
if (ret)
return ret;
if (!tmp421->channel[channel].enabled)
return -ENODATA;
switch (attr) {
case hwmon_temp_input:
if (!tmp421->channel[channel].enabled)
return -ENODATA;
*val = temp_from_raw(tmp421->channel[channel].temp,
tmp421->config & TMP421_CONFIG_RANGE);
return 0;
case hwmon_temp_fault:
if (!tmp421->channel[channel].enabled)
return -ENODATA;
/*
* Any of OPEN or /PVLD bits indicate a hardware mulfunction
* and the conversion result may be incorrect
*/
*val = !!(tmp421->channel[channel].temp & 0x03);
return 0;
case hwmon_temp_enable:
*val = tmp421->channel[channel].enabled;
return 0;
default:
return -EOPNOTSUPP;
}
@ -234,6 +238,24 @@ static int tmp421_read_string(struct device *dev, enum hwmon_sensor_types type,
return 0;
}
static int tmp421_write(struct device *dev, enum hwmon_sensor_types type,
u32 attr, int channel, long val)
{
struct tmp421_data *data = dev_get_drvdata(dev);
int ret;
switch (attr) {
case hwmon_temp_enable:
data->channel[channel].enabled = val;
ret = tmp421_enable_channels(data);
break;
default:
ret = -EOPNOTSUPP;
}
return ret;
}
static umode_t tmp421_is_visible(const void *data, enum hwmon_sensor_types type,
u32 attr, int channel)
{
@ -243,6 +265,8 @@ static umode_t tmp421_is_visible(const void *data, enum hwmon_sensor_types type,
return 0444;
case hwmon_temp_label:
return 0444;
case hwmon_temp_enable:
return 0644;
default:
return 0;
}
@ -402,6 +426,7 @@ static const struct hwmon_ops tmp421_ops = {
.is_visible = tmp421_is_visible,
.read = tmp421_read,
.read_string = tmp421_read_string,
.write = tmp421_write,
};
static int tmp421_probe(struct i2c_client *client)
@ -424,7 +449,7 @@ static int tmp421_probe(struct i2c_client *client)
data->client = client;
for (i = 0; i < data->channels; i++) {
data->temp_config[i] = HWMON_T_INPUT | HWMON_T_FAULT;
data->temp_config[i] = HWMON_T_INPUT | HWMON_T_FAULT | HWMON_T_ENABLE;
data->channel[i].enabled = true;
}