diff options
Diffstat (limited to 'drivers/power/supply/max17040_battery.c')
| -rw-r--r-- | drivers/power/supply/max17040_battery.c | 122 |
1 files changed, 118 insertions, 4 deletions
diff --git a/drivers/power/supply/max17040_battery.c b/drivers/power/supply/max17040_battery.c index 62499018e68b..8a1f0ee493aa 100644 --- a/drivers/power/supply/max17040_battery.c +++ b/drivers/power/supply/max17040_battery.c @@ -13,6 +13,7 @@ #include <linux/err.h> #include <linux/i2c.h> #include <linux/delay.h> +#include <linux/interrupt.h> #include <linux/power_supply.h> #include <linux/max17040_battery.h> #include <linux/slab.h> @@ -28,6 +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; @@ -42,6 +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, @@ -98,6 +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); @@ -160,21 +181,81 @@ 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); + max17040_get_soc(client); + max17040_get_online(client); + max17040_get_status(client); +} + static void max17040_work(struct work_struct *work) { struct max17040_chip *chip; + int last_soc, last_status; chip = container_of(work, struct max17040_chip, work.work); - max17040_get_vcell(chip->client); - max17040_get_soc(chip->client); - max17040_get_online(chip->client); - max17040_get_status(chip->client); + /* store SOC and status to check changes */ + last_soc = chip->soc; + last_status = chip->status; + max17040_check_changes(chip->client); + + /* check changes and send uevent */ + if (last_soc != chip->soc || last_status != chip->status) + power_supply_changed(chip->battery); queue_delayed_work(system_power_efficient_wq, &chip->work, MAX17040_DELAY); } +static irqreturn_t max17040_thread_handler(int id, void *dev) +{ + struct max17040_chip *chip = dev; + struct i2c_client *client = chip->client; + + dev_warn(&client->dev, "IRQ: Alert battery low level"); + /* read registers */ + max17040_check_changes(chip->client); + + /* send uevent */ + power_supply_changed(chip->battery); + + /* reset alert bit */ + max17040_set_low_soc_alert(client, chip->low_soc_alert); + + return IRQ_HANDLED; +} + +static int max17040_enable_alert_irq(struct max17040_chip *chip) +{ + struct i2c_client *client = chip->client; + unsigned int flags; + int ret; + + flags = IRQF_TRIGGER_FALLING | IRQF_ONESHOT; + ret = devm_request_threaded_irq(&client->dev, client->irq, NULL, + max17040_thread_handler, flags, + chip->battery->desc->name, chip); + + return ret; +} + static enum power_supply_property max17040_battery_props[] = { POWER_SUPPLY_PROP_STATUS, POWER_SUPPLY_PROP_ONLINE, @@ -196,6 +277,7 @@ 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; @@ -206,6 +288,12 @@ 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; @@ -220,6 +308,24 @@ static int max17040_probe(struct i2c_client *client, max17040_reset(client); max17040_get_version(client); + /* check interrupt */ + if (client->irq && of_device_is_compatible(client->dev.of_node, + "maxim,max77836-battery")) { + 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) { + client->irq = 0; + dev_warn(&client->dev, + "Failed to get IRQ err %d\n", ret); + } + } + INIT_DEFERRABLE_WORK(&chip->work, max17040_work); queue_delayed_work(system_power_efficient_wq, &chip->work, MAX17040_DELAY); @@ -244,6 +350,10 @@ static int max17040_suspend(struct device *dev) struct max17040_chip *chip = i2c_get_clientdata(client); cancel_delayed_work(&chip->work); + + if (client->irq && device_may_wakeup(dev)) + enable_irq_wake(client->irq); + return 0; } @@ -254,6 +364,10 @@ static int max17040_resume(struct device *dev) queue_delayed_work(system_power_efficient_wq, &chip->work, MAX17040_DELAY); + + if (client->irq && device_may_wakeup(dev)) + disable_irq_wake(client->irq); + return 0; } |