mfd: Add MAX8997/8966 IRQ control

This patch enables IRQ handling for MAX8997/8966 chips.

Please note that Fuel-Gauge-related IRQs are not implemented in this
initial release. The fuel gauge module in MAX8997 is identical to
MAX17042, which is already in Linux kernel. In order to use the
already-existing MAX17042 driver for fuel gauge module in MAX8997, the
main interrupt handler of MAX8997 should relay related interrupts to
MAX17042 driver. However, in order to do this, we need to modify
MAX17042 driver as well because MAX17042 driver does not have any
interrupt handlers for now. We are not going to implement this in this
initial release as it is not crucial in basic operations of MAX8997.
Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/mfd/Makefile

@@ -63,7 +63,7 @@ obj-$(CONFIG_UCB1400_CORE)	+= ucb1400_core.o
 obj-$(CONFIG_PMIC_DA903X)	+= da903x.o
 max8925-objs			:= max8925-core.o max8925-i2c.o
 obj-$(CONFIG_MFD_MAX8925)	+= max8925.o
-obj-$(CONFIG_MFD_MAX8997)	+= max8997.o
+obj-$(CONFIG_MFD_MAX8997)	+= max8997.o max8997-irq.o
 obj-$(CONFIG_MFD_MAX8998)	+= max8998.o max8998-irq.o
 
 pcf50633-objs			:= pcf50633-core.o pcf50633-irq.o

include/linux/mfd/max8997-private.h

@@ -24,6 +24,8 @@
 
 #include <linux/i2c.h>
 
+#define MAX8997_REG_INVALID	(0xff)
+
 enum max8997_pmic_reg {
 	MAX8997_REG_PMIC_ID0	= 0x00,
 	MAX8997_REG_PMIC_ID1	= 0x01,
@@ -313,6 +315,7 @@ enum max8997_irq {
 #define MAX8997_REG_BUCK2DVS(x)	(MAX8997_REG_BUCK2DVS1 + (x) - 1)
 #define MAX8997_REG_BUCK5DVS(x)	(MAX8997_REG_BUCK5DVS1 + (x) - 1)
 
+#define MAX8997_NUM_GPIO	12
 struct max8997_dev {
 	struct device *dev;
 	struct i2c_client *i2c; /* 0xcc / PMIC, Battery Control, and FLASH */
@@ -324,11 +327,19 @@ struct max8997_dev {
 	int type;
 	struct platform_device *battery; /* battery control (not fuel gauge) */
 
+	int irq;
+	int ono;
+	int irq_base;
 	bool wakeup;
+	struct mutex irqlock;
+	int irq_masks_cur[MAX8997_IRQ_GROUP_NR];
+	int irq_masks_cache[MAX8997_IRQ_GROUP_NR];
 
 	/* For hibernation */
 	u8 reg_dump[MAX8997_REG_PMIC_END + MAX8997_MUIC_REG_END +
 		MAX8997_HAPTIC_REG_END];
+
+	bool gpio_status[MAX8997_NUM_GPIO];
 };
 
 enum max8997_types {
@@ -336,6 +347,10 @@ enum max8997_types {
 	TYPE_MAX8966,
 };
 
+extern int max8997_irq_init(struct max8997_dev *max8997);
+extern void max8997_irq_exit(struct max8997_dev *max8997);
+extern int max8997_irq_resume(struct max8997_dev *max8997);
+
 extern int max8997_read_reg(struct i2c_client *i2c, u8 reg, u8 *dest);
 extern int max8997_bulk_read(struct i2c_client *i2c, u8 reg, int count,
 				u8 *buf);
@@ -344,4 +359,10 @@ extern int max8997_bulk_write(struct i2c_client *i2c, u8 reg, int count,
 				u8 *buf);
 extern int max8997_update_reg(struct i2c_client *i2c, u8 reg, u8 val, u8 mask);
 
+#define MAX8997_GPIO_INT_BOTH	(0x3 << 4)
+#define MAX8997_GPIO_INT_RISE	(0x2 << 4)
+#define MAX8997_GPIO_INT_FALL	(0x1 << 4)
+
+#define MAX8997_GPIO_INT_MASK	(0x3 << 4)
+#define MAX8997_GPIO_DATA_MASK	(0x1 << 2)
 #endif /*  __LINUX_MFD_MAX8997_PRIV_H */

include/linux/mfd/max8997.h

@@ -78,8 +78,11 @@ struct max8997_regulator_data {
 };
 
 struct max8997_platform_data {
-	bool wakeup;
-	/* IRQ: Not implemented */
+	/* IRQ */
+	int irq_base;
+	int ono;
+	int wakeup;
+
 	/* ---- PMIC ---- */
 	struct max8997_regulator_data *regulators;
 	int num_regulators;