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;
 }