Commit 814755c4 authored by Svyatoslav Ryhel's avatar Svyatoslav Ryhel Committed by Sebastian Reichel
Browse files

power: max17040: get thermal data from adc if available 



Since fuel gauge does not support thermal monitoring,
some vendors may couple this fuel gauge with thermal/adc
sensor to monitor battery cell exact temperature.

Add this feature by adding optional iio thermal channel.

Signed-off-by: default avatarSvyatoslav Ryhel <clamor95@gmail.com>
Reviewed-by: default avatarIskren Chernev <me@iskren.info>
Link: https://lore.kernel.org/r/20230731073613.10394-4-clamor95@gmail.com


Signed-off-by: default avatarSebastian Reichel <sebastian.reichel@collabora.com>
parent f4b782af

drivers/power/supply/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -374,7 +374,7 @@ config AXP288_FUEL_GAUGE 


config BATTERY_MAX17040

	tristate "Maxim MAX17040/17041/17043 family Fuel Gauge"

	depends on I2C

	depends on I2C && IIO

	select REGMAP_I2C

	help

	  Driver supports Maxim fuel-gauge systems for lithium-ion (Li+)

drivers/power/supply/max17040_battery.c

+21 −0
Original line number Diff line number Diff line
@@ -18,6 +18,7 @@ 
#include <linux/of.h>

#include <linux/regmap.h>

#include <linux/slab.h>

#include <linux/iio/consumer.h>



#define MAX17040_VCELL	0x02

#define MAX17040_SOC	0x04
@@ -142,6 +143,7 @@ struct max17040_chip { 
	struct delayed_work		work;

	struct power_supply		*battery;

	struct chip_data		data;

	struct iio_channel		*channel_temp;



	/* battery capacity */

	int soc;
@@ -404,6 +406,13 @@ static int max17040_get_property(struct power_supply *psy, 
	case POWER_SUPPLY_PROP_STATUS:

		power_supply_get_property_from_supplier(psy, psp, val);

		break;

	case POWER_SUPPLY_PROP_TEMP:

		if (!chip->channel_temp)

			return -ENODATA;



		iio_read_channel_processed_scale(chip->channel_temp,

						 &val->intval, 10);

		break;

	default:

		return -EINVAL;

	}
@@ -424,6 +433,7 @@ static enum power_supply_property max17040_battery_props[] = { 
	POWER_SUPPLY_PROP_CAPACITY,

	POWER_SUPPLY_PROP_CAPACITY_ALERT_MIN,

	POWER_SUPPLY_PROP_STATUS,

	POWER_SUPPLY_PROP_TEMP,

};



static const struct power_supply_desc max17040_battery_desc = {
@@ -469,6 +479,17 @@ static int max17040_probe(struct i2c_client *client) 
	i2c_set_clientdata(client, chip);

	psy_cfg.drv_data = chip;



	/* Switch to devm_iio_channel_get_optional when available  */

	chip->channel_temp = devm_iio_channel_get(&client->dev, "temp");

	if (IS_ERR(chip->channel_temp)) {

		ret = PTR_ERR(chip->channel_temp);

		if (ret != -ENODEV)

			return dev_err_probe(&client->dev, PTR_ERR(chip->channel_temp),

					     "failed to get temp\n");

		else

			chip->channel_temp = NULL;

	}



	chip->battery = devm_power_supply_register(&client->dev,

				&max17040_battery_desc, &psy_cfg);

	if (IS_ERR(chip->battery)) {