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authorMatheus Castello <matheus@castello.eng.br>2019-12-05 12:44:06 -0300
committerSebastian Reichel <sre@kernel.org>2019-12-19 01:51:52 +0100
commit2e17ed94de68953b17ed91b64f4bd176cdf38ad4 (patch)
tree98157e9536d50bd6f05fd6c85dcb51113bc4ffb2 /drivers/power
parent7a8bac169a65e0fb7e5da8ef3277b4016b5d1ffe (diff)
power: supply: max17040: Add IRQ handler for low SOC alert
According datasheet max17040 has a pin for alert host for low SOC. This pin can be used as external interrupt, so we need to check for interrupts assigned for device and handle it. In handler we are checking and storing fuel gauge registers values and send an uevent to notificate user space, so user space can decide save work or turn off since the alert demonstrate that the battery may no have the power to keep the system turned on for much longer. 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>
Diffstat (limited to 'drivers/power')
-rw-r--r--drivers/power/supply/max17040_battery.c73
1 files changed, 68 insertions, 5 deletions
diff --git a/drivers/power/supply/max17040_battery.c b/drivers/power/supply/max17040_battery.c
index 62499018e68b..5a8cd365a61e 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>
@@ -160,21 +161,54 @@ static void max17040_get_status(struct i2c_client *client)
chip->status = POWER_SUPPLY_STATUS_FULL;
}
+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;
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);
+ max17040_check_changes(chip->client);
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);
+
+ 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,
@@ -220,6 +254,19 @@ 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")) {
+ int 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 +291,14 @@ static int max17040_suspend(struct device *dev)
struct max17040_chip *chip = i2c_get_clientdata(client);
cancel_delayed_work(&chip->work);
+
+ if (client->irq) {
+ if (device_may_wakeup(dev))
+ enable_irq_wake(client->irq);
+ else
+ disable_irq_wake(client->irq);
+ }
+
return 0;
}
@@ -254,6 +309,14 @@ static int max17040_resume(struct device *dev)
queue_delayed_work(system_power_efficient_wq, &chip->work,
MAX17040_DELAY);
+
+ if (client->irq) {
+ if (device_may_wakeup(dev))
+ disable_irq_wake(client->irq);
+ else
+ enable_irq_wake(client->irq);
+ }
+
return 0;
}