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hwmon: (ntc_thermistor) Drop read_uv() depend on OF and IIO 

The only possible assignment of a function to get a voltage to
convert to a resistance is to use the internal function
ntc_adc_iio_read() which is only available when using IIO
and OF.

Bite the bullet and mandate OF and IIO, drop the read_uv()
callback abstraction and some ifdefs.

As no board is using the platform data, all users are using
OF and IIO anyway.

Cc: Peter Rosin <peda@axentia.se>
Cc: Chris Lesiak <chris.lesiak@licor.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20211125020841.3616359-4-linus.walleij@linaro.org
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Linus Walleij 2021-11-25 03:08:40 +01:00 committed by Guenter Roeck
parent 76f240ff95
commit 209218efd6
2 changed files with 16 additions and 38 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/hwmon/Kconfig
View File

@ -1414,8 +1414,9 @@ config SENSORS_PC87427
will be called pc87427.
config SENSORS_NTC_THERMISTOR
tristate "NTC thermistor support from Murata"
depends on !OF || IIO=n || IIO
tristate "NTC thermistor support"
depends on OF
depends on IIO
depends on THERMAL || !THERMAL_OF
help
This driver supports NTC thermistors sensor reading and its

33
drivers/hwmon/ntc_thermistor.c
View File

@ -28,8 +28,7 @@ enum ntc_thermistor_type {
struct ntc_thermistor_platform_data {
/*
* pullup_uV, pullup_ohm, pulldown_ohm, and connect are required to use
* read_uV()
* pullup_uV, pullup_ohm, pulldown_ohm, and connect are required.
*
* How to setup pullup_ohm, pulldown_ohm, and connect is
* described at Documentation/hwmon/ntc_thermistor.rst
@ -39,9 +38,7 @@ struct ntc_thermistor_platform_data {
* chan: iio_channel pointer to communicate with the ADC which the
* thermistor is using for conversion of the analog values.
*/
int (*read_uv)(struct ntc_thermistor_platform_data *);
unsigned int pullup_uv;
unsigned int pullup_ohm;
unsigned int pulldown_ohm;
enum { NTC_CONNECTED_POSITIVE, NTC_CONNECTED_GROUND } connect;
@ -346,7 +343,6 @@ struct ntc_data {
int n_comp;
};
#if defined(CONFIG_OF) && IS_ENABLED(CONFIG_IIO)
static int ntc_adc_iio_read(struct ntc_thermistor_platform_data *pdata)
{
struct iio_channel *channel = pdata->chan;
@ -451,20 +447,9 @@ ntc_thermistor_parse_dt(struct device *dev)
pdata->connect = NTC_CONNECTED_GROUND;
pdata->chan = chan;
pdata->read_uv = ntc_adc_iio_read;
return pdata;
}
#else
static struct ntc_thermistor_platform_data *
ntc_thermistor_parse_dt(struct device *dev)
{
return NULL;
}
#define ntc_match NULL
#endif
static inline u64 div64_u64_safe(u64 dividend, u64 divisor)
{
@ -594,13 +579,10 @@ static int ntc_thermistor_get_ohm(struct ntc_data *data)
{
int read_uv;
if (data->pdata->read_uv) {
read_uv = data->pdata->read_uv(data->pdata);
read_uv = ntc_adc_iio_read(data->pdata);
if (read_uv < 0)
return read_uv;
return get_ohm_of_thermistor(data, read_uv);
}
return -EINVAL;
}
static int ntc_read(struct device *dev, enum hwmon_sensor_types type,
@ -681,19 +663,14 @@ static int ntc_thermistor_probe(struct platform_device *pdev)
return -ENODEV;
}
if (!pdata->read_uv) {
dev_err(dev, "read_uv missing\n");
return -EINVAL;
}
if (pdata->read_uv && (pdata->pullup_uv == 0 ||
if (pdata->pullup_uv == 0 ||
(pdata->pullup_ohm == 0 && pdata->connect ==
NTC_CONNECTED_GROUND) ||
(pdata->pulldown_ohm == 0 && pdata->connect ==
NTC_CONNECTED_POSITIVE) ||
(pdata->connect != NTC_CONNECTED_POSITIVE &&
pdata->connect != NTC_CONNECTED_GROUND))) {
dev_err(dev, "Required data to use read_uv not supplied.\n");
pdata->connect != NTC_CONNECTED_GROUND)) {
dev_err(dev, "Required data to use NTC driver not supplied.\n");
return -EINVAL;
}