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hwmon: (ntc_thermistor) Add DT with IIO support to NTC thermistor driver

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This patch adds DT support to NTC driver to parse the
platform data.

Also adds the support to work as an iio device client.

During the probe ntc driver gets the respective channels of ADC
and uses iio_raw_read calls to get the ADC converted value.

Signed-off-by: Naveen Krishna Chatradhi <ch.naveen@samsung.com>
[Guenter Roeck: fixed Kconfig dependencies; use ERR_CAST]
Tested-by: Doug Anderson <dianders@chromium.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Naveen Krishna Chatradhi
2013-03-13 09:38:20 +05:30
committed by Guenter Roeck
parent 4b5e536b0e
commit 9e8269de10
4 changed files with 163 additions and 20 deletions
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8
include/linux/platform_data/ntc_thermistor.h
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@@ -21,6 +21,8 @@
#ifndef _LINUX_NTC_H
#define _LINUX_NTC_H
struct iio_channel;
enum ntc_thermistor_type {
TYPE_NCPXXWB473,
TYPE_NCPXXWL333,
@@ -39,13 +41,17 @@ struct ntc_thermistor_platform_data {
* described at Documentation/hwmon/ntc_thermistor
*
* pullup/down_ohm: 0 for infinite / not-connected
*
* chan: iio_channel pointer to communicate with the ADC which the
* thermistor is using for conversion of the analog values.
*/
int (*read_uV)(void);
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;
struct iio_channel *chan;
int (*read_ohm)(void);
};