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power: supply: max17040: Support soc alert

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max17048 and max17049 support SOC alerts (interrupts when battery
capacity changes by +/- 1%). At the moment the driver polls for changes
every second. Using the alerts removes the need for polling.

Signed-off-by: Iskren Chernev <iskren.chernev@gmail.com>
Tested-by: Jonathan Bakker <xc-racer2@live.ca>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
This commit is contained in:
Iskren Chernev 2020-09-22 14:42:37 +03:00 committed by Sebastian Reichel
parent 1779c6e349
commit ee2d433cb4
1 changed files with 73 additions and 9 deletions
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82
drivers/power/supply/max17040_battery.c
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@ -25,6 +25,7 @@
#define MAX17040_MODE 0x06
#define MAX17040_VER 0x08
#define MAX17040_CONFIG 0x0C
#define MAX17040_STATUS 0x1A
#define MAX17040_CMD 0xFE
@ -33,7 +34,10 @@
#define MAX17040_RCOMP_DEFAULT 0x9700
#define MAX17040_ATHD_MASK 0x3f
#define MAX17040_ALSC_MASK 0x40
#define MAX17040_ATHD_DEFAULT_POWER_UP 4
#define MAX17040_STATUS_HD_MASK 0x1000
#define MAX17040_STATUS_SC_MASK 0x2000
#define MAX17040_CFG_RCOMP_MASK 0xff00
enum chip_id {
@ -55,6 +59,7 @@ struct chip_data {
u16 vcell_div;
u8 has_low_soc_alert;
u8 rcomp_bytes;
u8 has_soc_alert;
};
static struct chip_data max17040_family[] = {
@ -65,6 +70,7 @@ static struct chip_data max17040_family[] = {
.vcell_div = 1,
.has_low_soc_alert = 0,
.rcomp_bytes = 2,
.has_soc_alert = 0,
},
[ID_MAX17041] = {
.reset_val = 0x0054,
@ -73,6 +79,7 @@ static struct chip_data max17040_family[] = {
.vcell_div = 1,
.has_low_soc_alert = 0,
.rcomp_bytes = 2,
.has_soc_alert = 0,
},
[ID_MAX17043] = {
.reset_val = 0x0054,
@ -81,6 +88,7 @@ static struct chip_data max17040_family[] = {
.vcell_div = 1,
.has_low_soc_alert = 1,
.rcomp_bytes = 1,
.has_soc_alert = 0,
},
[ID_MAX17044] = {
.reset_val = 0x0054,
@ -89,6 +97,7 @@ static struct chip_data max17040_family[] = {
.vcell_div = 1,
.has_low_soc_alert = 1,
.rcomp_bytes = 1,
.has_soc_alert = 0,
},
[ID_MAX17048] = {
.reset_val = 0x5400,
@ -97,6 +106,7 @@ static struct chip_data max17040_family[] = {
.vcell_div = 8,
.has_low_soc_alert = 1,
.rcomp_bytes = 1,
.has_soc_alert = 1,
},
[ID_MAX17049] = {
.reset_val = 0x5400,
@ -105,6 +115,7 @@ static struct chip_data max17040_family[] = {
.vcell_div = 4,
.has_low_soc_alert = 1,
.rcomp_bytes = 1,
.has_soc_alert = 1,
},
[ID_MAX17058] = {
.reset_val = 0x5400,
@ -113,6 +124,7 @@ static struct chip_data max17040_family[] = {
.vcell_div = 8,
.has_low_soc_alert = 1,
.rcomp_bytes = 1,
.has_soc_alert = 0,
},
[ID_MAX17059] = {
.reset_val = 0x5400,
@ -121,6 +133,7 @@ static struct chip_data max17040_family[] = {
.vcell_div = 4,
.has_low_soc_alert = 1,
.rcomp_bytes = 1,
.has_soc_alert = 0,
},
};
@ -156,6 +169,12 @@ static int max17040_set_low_soc_alert(struct max17040_chip *chip, u32 level)
MAX17040_ATHD_MASK, level);
}
static int max17040_set_soc_alert(struct max17040_chip *chip, bool enable)
{
return regmap_update_bits(chip->regmap, MAX17040_CONFIG,
MAX17040_ALSC_MASK, enable ? MAX17040_ALSC_MASK : 0);
}
static int max17040_set_rcomp(struct max17040_chip *chip, u16 rcomp)
{
u16 mask = chip->data.rcomp_bytes == 2 ?
@ -300,11 +319,33 @@ static void max17040_work(struct work_struct *work)
max17040_queue_work(chip);
}
/* Returns true if alert cause was SOC change, not low SOC */
static bool max17040_handle_soc_alert(struct max17040_chip *chip)
{
bool ret = true;
u32 data;
regmap_read(chip->regmap, MAX17040_STATUS, &data);
if (data & MAX17040_STATUS_HD_MASK) {
// this alert was caused by low soc
ret = false;
}
if (data & MAX17040_STATUS_SC_MASK) {
// soc change bit -- deassert to mark as handled
regmap_write(chip->regmap, MAX17040_STATUS,
data & ~MAX17040_STATUS_SC_MASK);
}
return ret;
}
static irqreturn_t max17040_thread_handler(int id, void *dev)
{
struct max17040_chip *chip = dev;
dev_warn(&chip->client->dev, "IRQ: Alert battery low level");
if (!(chip->data.has_soc_alert && max17040_handle_soc_alert(chip)))
dev_warn(&chip->client->dev, "IRQ: Alert battery low level\n");
/* read registers */
max17040_check_changes(chip);
@ -428,6 +469,7 @@ static int max17040_probe(struct i2c_client *client,
struct power_supply_config psy_cfg = {};
struct max17040_chip *chip;
enum chip_id chip_id;
bool enable_irq = false;
int ret;
if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE))
@ -479,6 +521,27 @@ static int max17040_probe(struct i2c_client *client,
return ret;
}
enable_irq = true;
}
if (client->irq && chip->data.has_soc_alert) {
ret = max17040_set_soc_alert(chip, 1);
if (ret) {
dev_err(&client->dev,
"Failed to set SOC alert: err %d\n", ret);
return ret;
}
enable_irq = true;
} else {
/* soc alerts negate the need for polling */
INIT_DEFERRABLE_WORK(&chip->work, max17040_work);
ret = devm_add_action(&client->dev, max17040_stop_work, chip);
if (ret)
return ret;
max17040_queue_work(chip);
}
if (enable_irq) {
ret = max17040_enable_alert_irq(chip);
if (ret) {
client->irq = 0;
@ -487,12 +550,6 @@ static int max17040_probe(struct i2c_client *client,
}
}
INIT_DEFERRABLE_WORK(&chip->work, max17040_work);
ret = devm_add_action(&client->dev, max17040_stop_work, chip);
if (ret)
return ret;
max17040_queue_work(chip);
return 0;
}
@ -503,7 +560,11 @@ static int max17040_suspend(struct device *dev)
struct i2c_client *client = to_i2c_client(dev);
struct max17040_chip *chip = i2c_get_clientdata(client);
cancel_delayed_work(&chip->work);
if (client->irq && chip->data.has_soc_alert)
// disable soc alert to prevent wakeup
max17040_set_soc_alert(chip, 0);
else
cancel_delayed_work(&chip->work);
if (client->irq && device_may_wakeup(dev))
enable_irq_wake(client->irq);
@ -519,7 +580,10 @@ static int max17040_resume(struct device *dev)
if (client->irq && device_may_wakeup(dev))
disable_irq_wake(client->irq);
max17040_queue_work(chip);
if (client->irq && chip->data.has_soc_alert)
max17040_set_soc_alert(chip, 1);
else
max17040_queue_work(chip);
return 0;
}