[PATCH v4 04/10] hwmon: (tmp421) support disabling channels from DT
From: Krzysztof Adamski <hidden>
Date: 2021-10-12 09:28:02
Also in:
linux-hwmon
Subsystem:
hardware monitoring, the rest · Maintainers:
Guenter Roeck, Linus Torvalds
The previous patch introduced per channel subnodes in DT that let us specify some channel specific properties. This built a ground for easily disabling individual channels of the sensor that may not be connected to any external diode and thus are not returning any meaningful data. This patch adds support for parsing the "status" property of channels DT subnodes and makes sure the -ENODATA is returned when disabled channels value is read. Signed-off-by: Krzysztof Adamski <redacted> --- drivers/hwmon/tmp421.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/drivers/hwmon/tmp421.c b/drivers/hwmon/tmp421.c
index ab64d9825ca4..fffffd671e34 100644
--- a/drivers/hwmon/tmp421.c
+++ b/drivers/hwmon/tmp421.c@@ -89,6 +89,7 @@ MODULE_DEVICE_TABLE(of, tmp421_of_match); struct tmp421_channel { const char *label; + bool enabled; s16 temp; };
@@ -170,6 +171,9 @@ 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: *val = temp_from_raw(tmp421->channel[channel].temp,
@@ -323,6 +327,8 @@ static int tmp421_probe_child_from_dt(struct i2c_client *client, if (data->channel[i].label) data->temp_config[i] |= HWMON_T_LABEL; + data->channel[i].enabled = of_device_is_available(child); + return 0; }
@@ -371,8 +377,10 @@ static int tmp421_probe(struct i2c_client *client) if (err) return err; - for (i = 0; i < data->channels; i++) + for (i = 0; i < data->channels; i++) { data->temp_config[i] = HWMON_T_INPUT | HWMON_T_FAULT; + data->channel[i].enabled = true; + } err = tmp421_probe_from_dt(client, data); if (err)
--
2.31.1