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Commit 4f8d374b authored by Jean-Francois Dagenais's avatar Jean-Francois Dagenais Committed by Guenter Roeck
Browse files

hwmon: (max6650) add thermal cooling device capability 



This allows max6650 devices to be referenced in dts as a cooling device.

The pwm value seems duplicated in cooling_dev_state but since pwm goes
through rounding logic into data->dac, it is modified and messes with
the thermal zone state algorithms. It's also better to serve a cache
value, thus avoiding periodic actual i2c traffic.

Signed-off-by: default avatarJean-Francois Dagenais <jeff.dagenais@gmail.com>
Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
parent 023912db

drivers/hwmon/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -908,6 +908,7 @@ config SENSORS_MAX6642 
config SENSORS_MAX6650

	tristate "Maxim MAX6650 sensor chip"

	depends on I2C

	depends on THERMAL || THERMAL=n

	help

	  If you say yes here you get support for the MAX6650 / MAX6651

	  sensor chips.

drivers/hwmon/max6650.c

+89 −1
Original line number Diff line number Diff line
@@ -40,6 +40,7 @@ 
#include <linux/hwmon-sysfs.h>

#include <linux/err.h>

#include <linux/of_device.h>

#include <linux/thermal.h>



/*

 * Insmod parameters
@@ -113,6 +114,7 @@ module_param(clock, int, 0444); 
struct max6650_data {

	struct i2c_client *client;

	const struct attribute_group *groups[3];

	struct thermal_cooling_device *cooling_dev;

	struct mutex update_lock;

	int nr_fans;

	char valid; /* zero until following fields are valid */
@@ -125,6 +127,7 @@ struct max6650_data { 
	u8 count;

	u8 dac;

	u8 alarm;

	unsigned long cooling_dev_state;

};



static const u8 tach_reg[] = {
@@ -694,6 +697,63 @@ static int max6650_init_client(struct max6650_data *data, 
	return 0;

}



#if IS_ENABLED(CONFIG_THERMAL)



static int max6650_get_max_state(struct thermal_cooling_device *cdev,

				 unsigned long *state)

{

	*state = 255;



	return 0;

}



static int max6650_get_cur_state(struct thermal_cooling_device *cdev,

				 unsigned long *state)

{

	struct max6650_data *data = cdev->devdata;



	*state = data->cooling_dev_state;



	return 0;

}



static int max6650_set_cur_state(struct thermal_cooling_device *cdev,

				 unsigned long state)

{

	struct max6650_data *data = cdev->devdata;

	struct i2c_client *client = data->client;

	int err;



	state = clamp_val(state, 0, 255);



	mutex_lock(&data->update_lock);



	if (data->config & MAX6650_CFG_V12)

		data->dac = 180 - (180 * state)/255;

	else

		data->dac = 76 - (76 * state)/255;



	err = i2c_smbus_write_byte_data(client, MAX6650_REG_DAC, data->dac);



	if (!err) {

		max6650_set_operating_mode(data, state ?

						   MAX6650_CFG_MODE_OPEN_LOOP :

						   MAX6650_CFG_MODE_OFF);

		data->cooling_dev_state = state;

	}



	mutex_unlock(&data->update_lock);



	return err < 0 ? err : 0;

}



static const struct thermal_cooling_device_ops max6650_cooling_ops = {

	.get_max_state = max6650_get_max_state,

	.get_cur_state = max6650_get_cur_state,

	.set_cur_state = max6650_set_cur_state,

};

#endif



static int max6650_probe(struct i2c_client *client,

			 const struct i2c_device_id *id)

{
@@ -709,6 +769,7 @@ static int max6650_probe(struct i2c_client *client, 
		return -ENOMEM;



	data->client = client;

	i2c_set_clientdata(client, data);

	mutex_init(&data->update_lock);

	data->nr_fans = of_id ? (int)(uintptr_t)of_id->data : id->driver_data;
@@ -727,7 +788,33 @@ static int max6650_probe(struct i2c_client *client, 
	hwmon_dev = devm_hwmon_device_register_with_groups(dev,

							   client->name, data,

							   data->groups);

	return PTR_ERR_OR_ZERO(hwmon_dev);

	err = PTR_ERR_OR_ZERO(hwmon_dev);

	if (err)

		return err;



#if IS_ENABLED(CONFIG_THERMAL)

	data->cooling_dev =

		thermal_of_cooling_device_register(client->dev.of_node,

						   client->name, data,

						   &max6650_cooling_ops);

	if (IS_ERR(data->cooling_dev))

		dev_warn(&client->dev,

			 "thermal cooling device register failed: %ld\n",

			 PTR_ERR(data->cooling_dev));

	else

		thermal_cdev_update(data->cooling_dev);

#endif

	return 0;

}



static int max6650_remove(struct i2c_client *client)

{

	struct max6650_data *data = i2c_get_clientdata(client);



	if (!IS_ERR(data->cooling_dev))

		thermal_cooling_device_unregister(data->cooling_dev);



	return 0;

}



static const struct i2c_device_id max6650_id[] = {
@@ -743,6 +830,7 @@ static struct i2c_driver max6650_driver = { 
		.of_match_table = of_match_ptr(max6650_dt_match),

	},

	.probe		= max6650_probe,

	.remove		= max6650_remove,

	.id_table	= max6650_id,

};