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power: supply: max17040: Config alert SOC low level threshold from FDT

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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: Matheus Castello <matheus@castello.eng.br>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
This commit is contained in:
Matheus Castello 2019-12-05 12:44:09 -03:00 committed by Sebastian Reichel
parent 2e17ed94de
commit cccdd0ca1c
1 changed files with 51 additions and 1 deletions
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52
drivers/power/supply/max17040_battery.c
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@ -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) {