Commit a45923c2 authored by Alexander Koch's avatar Alexander Koch Committed by Guenter Roeck
Browse files

hwmon: (adc128d818) Implement mode selection via dt 



Implement operation mode selection using the optional 'ti,mode' devicetree
property (see [1]). The ADC128D818 supports four operation modes differing
in the number and type of input readings (see datasheet, sec. 8.4.1), of
which mode 0 is the default.

We only add handling of the 'ti,mode' property here, the driver still
supports nothing else than the default mode 0.

[1] Documentation/devicetree/bindings/hwmon/adc128d818.txt

Signed-off-by: default avatarAlexander Koch <mail@alexanderkoch.net>
Acked-by: default avatarMichael Hornung <mhornung.linux@gmail.com>
Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
parent bbcf37d7

drivers/hwmon/adc128d818.c

+24 −0
Original line number Diff line number Diff line
@@ -28,6 +28,7 @@ 
#include <linux/regulator/consumer.h>

#include <linux/mutex.h>

#include <linux/bitops.h>

#include <linux/of.h>



/* Addresses to scan

 * The chip also supports addresses 0x35..0x37. Don't scan those addresses
@@ -63,6 +64,7 @@ struct adc128_data { 
	struct regulator *regulator;

	int vref;		/* Reference voltage in mV */

	struct mutex update_lock;

	u8 mode;		/* Operation mode */

	bool valid;		/* true if following fields are valid */

	unsigned long last_updated;	/* In jiffies */
@@ -387,6 +389,15 @@ static int adc128_init_client(struct adc128_data *data) 
	if (err)

		return err;



	/* Set operation mode, if non-default */

	if (data->mode != 0) {

		err = i2c_smbus_write_byte_data(client,

						ADC128_REG_CONFIG_ADV,

						data->mode << 1);

		if (err)

			return err;

	}



	/* Start monitoring */

	err = i2c_smbus_write_byte_data(client, ADC128_REG_CONFIG, 0x01);

	if (err)
@@ -433,6 +444,19 @@ static int adc128_probe(struct i2c_client *client, 
		data->vref = 2560;	/* 2.56V, in mV */

	}



	/* Operation mode is optional and defaults to mode 0 */

	if (of_property_read_u8(dev->of_node, "ti,mode", &data->mode) == 0) {

		/* Currently only mode 0 supported */

		if (data->mode != 0) {

			dev_err(dev, "unsupported operation mode %d\n",

				data->mode);

			err = -EINVAL;

			goto error;

		}

	} else {

		data->mode = 0;

	}



	data->client = client;

	i2c_set_clientdata(client, data);

	mutex_init(&data->update_lock);

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