Commit 9e8269de authored by Naveen Krishna Chatradhi's avatar Naveen Krishna Chatradhi Committed by Guenter Roeck
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hwmon: (ntc_thermistor) Add DT with IIO support to NTC thermistor driver 



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: default avatarNaveen Krishna Chatradhi <ch.naveen@samsung.com>
[Guenter Roeck: fixed Kconfig dependencies; use ERR_CAST]
Tested-by: default avatarDoug Anderson <dianders@chromium.org>
Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
parent 4b5e536b

Documentation/devicetree/bindings/hwmon/ntc_thermistor.txt

0 → 100644
+29 −0
Original line number Diff line number Diff line 
NTC Thermistor hwmon sensors

-------------------------------



Requires node properties:

- "compatible" value : one of

	"ntc,ncp15wb473"

	"ntc,ncp18wb473"

	"ntc,ncp21wb473"

	"ntc,ncp03wb473"

	"ntc,ncp15wl333"

- "pullup-uv"	Pull up voltage in micro volts

- "pullup-ohm"	Pull up resistor value in ohms

- "pulldown-ohm" Pull down resistor value in ohms

- "connected-positive" Always ON, If not specified.

		Status change is possible.

- "io-channels"	Channel node of ADC to be used for

		conversion.



Read more about iio bindings at

	Documentation/devicetree/bindings/iio/iio-bindings.txt



Example:

	ncp15wb473@0 {

		compatible = "ntc,ncp15wb473";

		pullup-uv = <1800000>;

		pullup-ohm = <47000>;

		pulldown-ohm = <0>;

		io-channels = <&adc 3>;

	};

drivers/hwmon/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -899,6 +899,7 @@ config SENSORS_MCP3021 


config SENSORS_NTC_THERMISTOR

	tristate "NTC thermistor support"

	depends on (!OF && !IIO) || (OF && IIO)

	help

	  This driver supports NTC thermistors sensor reading and its

	  interpretation. The driver can also monitor the temperature and

drivers/hwmon/ntc_thermistor.c

+126 −19
Original line number Diff line number Diff line
@@ -26,9 +26,16 @@ 
#include <linux/math64.h>

#include <linux/platform_device.h>

#include <linux/err.h>

#include <linux/of.h>

#include <linux/of_device.h>



#include <linux/platform_data/ntc_thermistor.h>



#include <linux/iio/iio.h>

#include <linux/iio/machine.h>

#include <linux/iio/driver.h>

#include <linux/iio/consumer.h>



#include <linux/hwmon.h>

#include <linux/hwmon-sysfs.h>
@@ -37,6 +44,15 @@ struct ntc_compensation { 
	unsigned int	ohm;

};



static const struct platform_device_id ntc_thermistor_id[] = {

	{ "ncp15wb473", TYPE_NCPXXWB473 },

	{ "ncp18wb473", TYPE_NCPXXWB473 },

	{ "ncp21wb473", TYPE_NCPXXWB473 },

	{ "ncp03wb473", TYPE_NCPXXWB473 },

	{ "ncp15wl333", TYPE_NCPXXWL333 },

	{ },

};



/*

 * A compensation table should be sorted by the values of .ohm

 * in descending order.
@@ -125,6 +141,92 @@ struct ntc_data { 
	char name[PLATFORM_NAME_SIZE];

};



#ifdef CONFIG_OF

static int ntc_adc_iio_read(struct ntc_thermistor_platform_data *pdata)

{

	struct iio_channel *channel = pdata->chan;

	unsigned int result;

	int val, ret;



	ret = iio_read_channel_raw(channel, &val);

	if (ret < 0) {

		pr_err("read channel() error: %d\n", ret);

		return ret;

	}



	/* unit: mV */

	result = pdata->pullup_uV * val;

	result >>= 12;



	return result;

}



static const struct of_device_id ntc_match[] = {

	{ .compatible = "ntc,ncp15wb473",

		.data = &ntc_thermistor_id[TYPE_NCPXXWB473] },

	{ .compatible = "ntc,ncp18wb473",

		.data = &ntc_thermistor_id[TYPE_NCPXXWB473] },

	{ .compatible = "ntc,ncp21wb473",

		.data = &ntc_thermistor_id[TYPE_NCPXXWB473] },

	{ .compatible = "ntc,ncp03wb473",

		.data = &ntc_thermistor_id[TYPE_NCPXXWB473] },

	{ .compatible = "ntc,ncp15wl333",

		.data = &ntc_thermistor_id[TYPE_NCPXXWL333] },

	{ },

};

MODULE_DEVICE_TABLE(of, ntc_match);



static struct ntc_thermistor_platform_data *

ntc_thermistor_parse_dt(struct platform_device *pdev)

{

	struct iio_channel *chan;

	struct device_node *np = pdev->dev.of_node;

	struct ntc_thermistor_platform_data *pdata;



	if (!np)

		return NULL;



	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);

	if (!pdata)

		return ERR_PTR(-ENOMEM);



	chan = iio_channel_get(&pdev->dev, NULL);

	if (IS_ERR(chan))

		return ERR_CAST(chan);



	if (of_property_read_u32(np, "pullup-uv", &pdata->pullup_uV))

		return ERR_PTR(-ENODEV);

	if (of_property_read_u32(np, "pullup-ohm", &pdata->pullup_ohm))

		return ERR_PTR(-ENODEV);

	if (of_property_read_u32(np, "pulldown-ohm", &pdata->pulldown_ohm))

		return ERR_PTR(-ENODEV);



	if (of_find_property(np, "connected-positive", NULL))

		pdata->connect = NTC_CONNECTED_POSITIVE;

	else /* status change should be possible if not always on. */

		pdata->connect = NTC_CONNECTED_GROUND;



	pdata->chan = chan;

	pdata->read_uV = ntc_adc_iio_read;



	return pdata;

}

static void ntc_iio_channel_release(struct ntc_thermistor_platform_data *pdata)

{

	if (pdata->chan)

		iio_channel_release(pdata->chan);

}

#else

static struct ntc_thermistor_platform_data *

ntc_thermistor_parse_dt(struct platform_device *pdev)

{

	return NULL;

}



static void ntc_iio_channel_release(struct ntc_thermistor_platform_data *pdata)

{ }

#endif



static inline u64 div64_u64_safe(u64 dividend, u64 divisor)

{

	if (divisor == 0 && dividend == 0)
@@ -259,7 +361,7 @@ static int ntc_thermistor_get_ohm(struct ntc_data *data) 
		return data->pdata->read_ohm();



	if (data->pdata->read_uV) {

		read_uV = data->pdata->read_uV();

		read_uV = data->pdata->read_uV(data->pdata);

		if (read_uV < 0)

			return read_uV;

		return get_ohm_of_thermistor(data, read_uV);
@@ -311,9 +413,18 @@ static const struct attribute_group ntc_attr_group = { 


static int ntc_thermistor_probe(struct platform_device *pdev)

{

	const struct of_device_id *of_id =

			of_match_device(of_match_ptr(ntc_match), &pdev->dev);

	const struct platform_device_id *pdev_id;

	struct ntc_thermistor_platform_data *pdata;

	struct ntc_data *data;

	struct ntc_thermistor_platform_data *pdata = pdev->dev.platform_data;

	int ret = 0;

	int ret;



	pdata = ntc_thermistor_parse_dt(pdev);

	if (IS_ERR(pdata))

		return PTR_ERR(pdata);

	else if (pdata == NULL)

		pdata = pdev->dev.platform_data;



	if (!pdata) {

		dev_err(&pdev->dev, "No platform init data supplied.\n");
@@ -349,11 +460,13 @@ static int ntc_thermistor_probe(struct platform_device *pdev) 
	if (!data)

		return -ENOMEM;



	pdev_id = of_id ? of_id->data : platform_get_device_id(pdev);



	data->dev = &pdev->dev;

	data->pdata = pdata;

	strlcpy(data->name, pdev->id_entry->name, sizeof(data->name));

	strlcpy(data->name, pdev_id->name, sizeof(data->name));



	switch (pdev->id_entry->driver_data) {

	switch (pdev_id->driver_data) {

	case TYPE_NCPXXWB473:

		data->comp = ncpXXwb473;

		data->n_comp = ARRAY_SIZE(ncpXXwb473);
@@ -364,8 +477,7 @@ static int ntc_thermistor_probe(struct platform_device *pdev) 
		break;

	default:

		dev_err(&pdev->dev, "Unknown device type: %lu(%s)\n",

				pdev->id_entry->driver_data,

				pdev->id_entry->name);

				pdev_id->driver_data, pdev_id->name);

		return -EINVAL;

	}
@@ -384,39 +496,34 @@ static int ntc_thermistor_probe(struct platform_device *pdev) 
		goto err_after_sysfs;

	}



	dev_info(&pdev->dev, "Thermistor %s:%d (type: %s/%lu) successfully probed.\n",

			pdev->name, pdev->id, pdev->id_entry->name,

			pdev->id_entry->driver_data);

	dev_info(&pdev->dev, "Thermistor type: %s successfully probed.\n",

								pdev->name);



	return 0;

err_after_sysfs:

	sysfs_remove_group(&data->dev->kobj, &ntc_attr_group);

	ntc_iio_channel_release(pdata);

	return ret;

}



static int ntc_thermistor_remove(struct platform_device *pdev)

{

	struct ntc_data *data = platform_get_drvdata(pdev);

	struct ntc_thermistor_platform_data *pdata = data->pdata;



	hwmon_device_unregister(data->hwmon_dev);

	sysfs_remove_group(&data->dev->kobj, &ntc_attr_group);

	ntc_iio_channel_release(pdata);

	platform_set_drvdata(pdev, NULL);



	return 0;

}



static const struct platform_device_id ntc_thermistor_id[] = {

	{ "ncp15wb473", TYPE_NCPXXWB473 },

	{ "ncp18wb473", TYPE_NCPXXWB473 },

	{ "ncp21wb473", TYPE_NCPXXWB473 },

	{ "ncp03wb473", TYPE_NCPXXWB473 },

	{ "ncp15wl333", TYPE_NCPXXWL333 },

	{ },

};



static struct platform_driver ntc_thermistor_driver = {

	.driver = {

		.name = "ntc-thermistor",

		.owner = THIS_MODULE,

		.of_match_table = of_match_ptr(ntc_match),

	},

	.probe = ntc_thermistor_probe,

	.remove = ntc_thermistor_remove,

include/linux/platform_data/ntc_thermistor.h

+7 −1
Original line number Diff line number Diff line
@@ -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);

};

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