The charger now works off of an IRQ, instead of scheduling every minute.

Change-Id: Id3696474a3b23da5ae7479e175642cb5a7d81599

3 files changed, 42 insertions, 1 deletions

diff --git a/arch/arm/boot/dts/omap3_h1.dts b/arch/arm/boot/dts/omap3_h1.dts
index 5f200367193..481ec5e1976 100644
--- a/arch/arm/boot/dts/omap3_h1.dts
+++ b/arch/arm/boot/dts/omap3_h1.dts
@@ -77,6 +77,7 @@
 		/*             off  IRQ handle                        */
 		ti,pad_irq = <0x152  88  1>, /* uart1 - BT input      */
                      <0x9f6  143 1>, /* mpu6515 irq pin - is this offset correct?      */
+                     <0x9ea  122 1>, /* bq27400 chg irq8 */
                      <0x9f4  123 1>, /* BT host wake          */
                      <0x1b0  23  1>; /* sys_nirq              */
 	};
@@ -232,7 +233,8 @@
 		pinctrl-single,pins = <
 			0x006 0x008     /* SYS_CLKREQ, MODE0 | PULLDOWN */
 			0x018 0x000     /* SYS_OFF_MODE, MODE0 */
-			0x01a 0x10c     /* SYS_CLKOUT1, MODE4 | INPUT_PULLDOWN */
+			/* Fuel gauge interrupt */
+			0x01a 0x4104     /* SYS_CLKOUT1, MODE4 | OMAP_PIN_INPUT */
 
             /* Wakeup from Bluetooth */
             0x024 0x410C    /* JTAG_EMU0, OMAP_MUX_MODE4 | OMAP_PIN_INPUT |
diff --git a/arch/arm/mach-omap2/board-omap3h1.c b/arch/arm/mach-omap2/board-omap3h1.c
index 6f089952c8f..06b150f4956 100644
--- a/arch/arm/mach-omap2/board-omap3h1.c
+++ b/arch/arm/mach-omap2/board-omap3h1.c
@@ -79,6 +79,7 @@
 #define TPS_SYS_NIRQ 0
 #define USB_IRQ 124
 #define USB_CS 17
+#define CHG_GPOUT 10
 
 #define DEFAULT_RXDMA_POLLRATE		1	/* RX DMA polling rate (us) */
 #define DEFAULT_RXDMA_BUFSIZE		4096	/* RX DMA buffer size */
@@ -397,6 +398,10 @@ static int __init omap3_h1_i2c_init(void)
     omap3h1_i2c1_board_info[1].irq = acc_irq;
 #endif
 
+#if defined (CONFIG_MACH_OMAP3_H1_PV)
+    omap3h1_i2c2_board_info[4].irq = gpio_to_irq(CHG_GPOUT);
+#endif
+
 	gpio_request_one(USB_CS, GPIOF_OUT_INIT_HIGH, "USB on");
     
     /* Register buses */
diff --git a/drivers/power/bq27x00_battery.c b/drivers/power/bq27x00_battery.c
index 7bed61e6229..86b4709b911 100644
--- a/drivers/power/bq27x00_battery.c
+++ b/drivers/power/bq27x00_battery.c
@@ -37,6 +37,8 @@
 #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>
 
@@ -279,6 +281,7 @@ 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 +1348,15 @@ 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;
+	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 +1405,23 @@ static int __init bq27x00_powersupply_init(struct bq27x00_device_info *di)
 		return ret;
 	}
 
+	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 +1443,10 @@ 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 +1718,7 @@ 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;