Commit cccdd0ca authored by Matheus Castello's avatar Matheus Castello Committed by Sebastian Reichel
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power: supply: max17040: Config alert SOC low level threshold from FDT 



For configuration of fuel gauge alert for a low level state of charge
interrupt we add a function to config level threshold and a device tree
binding property to set it in flatned device tree node.

Now we can use "maxim,alert-low-soc-level" property with the values from
1% up to 32% to configure alert interrupt threshold.

Signed-off-by: default avatarMatheus Castello <matheus@castello.eng.br>
Reviewed-by: default avatarKrzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: default avatarSebastian Reichel <sebastian.reichel@collabora.com>
parent 2e17ed94

drivers/power/supply/max17040_battery.c

+51 −1
Original line number Diff line number Diff line
@@ -29,6 +29,9 @@ 
#define MAX17040_DELAY		1000

#define MAX17040_BATTERY_FULL	95



#define MAX17040_ATHD_MASK		0xFFC0

#define MAX17040_ATHD_DEFAULT_POWER_UP	4



struct max17040_chip {

	struct i2c_client		*client;

	struct delayed_work		work;
@@ -43,6 +46,8 @@ struct max17040_chip { 
	int soc;

	/* State Of Charge */

	int status;

	/* Low alert threshold from 32% to 1% of the State of Charge */

	u32 low_soc_alert;

};



static int max17040_get_property(struct power_supply *psy,
@@ -99,6 +104,21 @@ static void max17040_reset(struct i2c_client *client) 
	max17040_write_reg(client, MAX17040_CMD, 0x0054);

}



static int max17040_set_low_soc_alert(struct i2c_client *client, u32 level)

{

	int ret;

	u16 data;



	level = 32 - level;

	data = max17040_read_reg(client, MAX17040_RCOMP);

	/* clear the alrt bit and set LSb 5 bits */

	data &= MAX17040_ATHD_MASK;

	data |= level;

	ret = max17040_write_reg(client, MAX17040_RCOMP, data);



	return ret;

}



static void max17040_get_vcell(struct i2c_client *client)

{

	struct max17040_chip *chip = i2c_get_clientdata(client);
@@ -161,6 +181,21 @@ static void max17040_get_status(struct i2c_client *client) 
		chip->status = POWER_SUPPLY_STATUS_FULL;

}



static int max17040_get_of_data(struct max17040_chip *chip)

{

	struct device *dev = &chip->client->dev;



	chip->low_soc_alert = MAX17040_ATHD_DEFAULT_POWER_UP;

	device_property_read_u32(dev,

				 "maxim,alert-low-soc-level",

				 &chip->low_soc_alert);



	if (chip->low_soc_alert <= 0 || chip->low_soc_alert >= 33)

		return -EINVAL;



	return 0;

}



static void max17040_check_changes(struct i2c_client *client)

{

	max17040_get_vcell(client);
@@ -192,6 +227,9 @@ static irqreturn_t max17040_thread_handler(int id, void *dev) 
	/* send uevent */

	power_supply_changed(chip->battery);



	/* reset alert bit */

	max17040_set_low_soc_alert(client, chip->low_soc_alert);



	return IRQ_HANDLED;

}
@@ -230,6 +268,7 @@ static int max17040_probe(struct i2c_client *client, 
	struct i2c_adapter *adapter = client->adapter;

	struct power_supply_config psy_cfg = {};

	struct max17040_chip *chip;

	int ret;



	if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))

		return -EIO;
@@ -240,6 +279,12 @@ static int max17040_probe(struct i2c_client *client, 


	chip->client = client;

	chip->pdata = client->dev.platform_data;

	ret = max17040_get_of_data(chip);

	if (ret) {

		dev_err(&client->dev,

			"failed: low SOC alert OF data out of bounds\n");

		return ret;

	}



	i2c_set_clientdata(client, chip);

	psy_cfg.drv_data = chip;
@@ -257,7 +302,12 @@ static int max17040_probe(struct i2c_client *client, 
	/* check interrupt */

	if (client->irq && of_device_is_compatible(client->dev.of_node,

						   "maxim,max77836-battery")) {

		int ret;

		ret = max17040_set_low_soc_alert(client, chip->low_soc_alert);

		if (ret) {

			dev_err(&client->dev,

				"Failed to set low SOC alert: err %d\n", ret);

			return ret;

		}



		ret = max17040_enable_alert_irq(chip);

		if (ret) {

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