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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: Svyatoslav Ryhel <clamor95@gmail.com>
Reviewed-by: Iskren Chernev <me@iskren.info>
Link: https://lore.kernel.org/r/20230731073613.10394-4-clamor95@gmail.com
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
This commit is contained in:
Svyatoslav Ryhel 2023-07-31 10:36:12 +03:00 committed by Sebastian Reichel
parent f4b782af61
commit 814755c48f
2 changed files with 22 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/power/supply/Kconfig
View File

@ -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+)

21
drivers/power/supply/max17040_battery.c
View File

@ -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)) {