1 files changed, 40 insertions, 0 deletions

diff --git a/drivers/power/bq27x00_battery.c b/drivers/power/bq27x00_battery.c
index 7bed61e6229..c10f48b20c8 100644
--- a/drivers/power/bq27x00_battery.c
+++ b/drivers/power/bq27x00_battery.c
@@ -37,8 +37,11 @@
 #include <linux/power_supply.h>
 #include <linux/idr.h>
 #include <linux/i2c.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
 #include <linux/slab.h>
 #include <asm/unaligned.h>
+#include <linux/wakelock.h>
 
 #include <linux/power/bq27x00_battery.h>
 
@@ -67,6 +70,8 @@ enum bq27xxx_reg_index {
 	NUM_REGS
 };
 
+struct wake_lock chg_wake_lock;
+
 /* bq27500 registers */
 static __initdata u8 bq27500_regs[NUM_REGS] = {
 	0x00,	/* CONTROL	*/
@@ -279,6 +284,7 @@ struct bq27x00_device_info {
 	struct device 		*dev;
 	int			id;
 	enum bq27x00_chip	chip;
+	int irq;
 
 	struct bq27x00_reg_cache cache;
 	int charge_design_full;
@@ -1345,6 +1351,16 @@ static void bq27x00_external_power_changed(struct power_supply *psy)
 	schedule_delayed_work(&di->work, 0);
 }
 
+static irqreturn_t bq27x00_chg_isr(int irq, void *dev) {
+
+	struct power_supply *ps = (struct power_supply*) dev;
+	wake_lock_timeout(&chg_wake_lock, msecs_to_jiffies(500));
+	dev_dbg(ps->dev, "%s: Updating battery status\n", __func__);
+	bq27x00_external_power_changed(ps);
+
+	return IRQ_HANDLED;
+}
+
 static void __init set_properties_array(struct bq27x00_device_info *di,
 	enum power_supply_property *props, int num_props)
 {
@@ -1393,6 +1409,25 @@ static int __init bq27x00_powersupply_init(struct bq27x00_device_info *di)
 		return ret;
 	}
 
+	wake_lock_init(&chg_wake_lock, WAKE_LOCK_SUSPEND, "chg_wake_lock");
+
+	if(di->irq) {
+		// If using an irq, disable poll interal
+		poll_interval = 0;
+		ret = request_irq(di->irq, bq27x00_chg_isr, IRQF_TRIGGER_RISING,
+                "bq27x00 chg", &di->bat);
+		if (ret) {
+			dev_err(di->dev, "failed to request irq: %d\n", di->irq);
+			return ret;
+		}
+
+		ret = enable_irq_wake(di->irq);
+		if (ret) {
+			dev_err(di->dev, "failed to enable irq: %d, as wake\n", di->irq);
+			return ret;
+		}
+	}
+
 	dev_info(di->dev, "support ver. %s enabled\n", DRIVER_VERSION);
 
 	bq27x00_update(di);
@@ -1414,6 +1449,10 @@ static void bq27x00_powersupply_unregister(struct bq27x00_device_info *di)
 
 	power_supply_unregister(&di->bat);
 
+	if(di->irq) {
+		free_irq(di->irq, di);
+	}
+
 	mutex_destroy(&di->lock);
 }
 
@@ -1685,6 +1724,7 @@ static int __init bq27x00_battery_probe(struct i2c_client *client,
 	di->bus.blk_write = bq27xxx_write_i2c_blk;
 	di->dm_regs = NULL;
 	di->dm_regs_count = 0;
+	di->irq = client->irq;
 
 	if (di->chip == BQ27200)
 		regs = bq27200_regs;