mfd: MAX77693: Fix interrupt handling bug

This patch fix bug related to interrupt handling for MAX77693 devices.
- Unmask interrupt masking bit for charger/flash/muic to revolve
that interrupt isn't happened when external connector is attached.
- Fix wrong regmap instance when muic interrupt is happened.

This patch were discussed and confirm discussion about this patch on below url:
http://lkml.org/lkml/2012/7/16/118

Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Myungjoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

diff --git a/drivers/mfd/max77693-irq.c b/drivers/mfd/max77693-irq.c
index 2b40356..1029d01 100644 (file)
--- a/drivers/mfd/max77693-irq.c
+++ b/drivers/mfd/max77693-irq.c
@@ -137,6 +137,9 @@ static void max77693_irq_mask(struct irq_data *data)
        const struct max77693_irq_data *irq_data =
                                irq_to_max77693_irq(max77693, data->irq);
 
+       if (irq_data->group >= MAX77693_IRQ_GROUP_NR)
+               return;
+
        if (irq_data->group >= MUIC_INT1 && irq_data->group <= MUIC_INT3)
                max77693->irq_masks_cur[irq_data->group] &= ~irq_data->mask;
        else
@@ -149,6 +152,9 @@ static void max77693_irq_unmask(struct irq_data *data)
        const struct max77693_irq_data *irq_data =
            irq_to_max77693_irq(max77693, data->irq);
 
+       if (irq_data->group >= MAX77693_IRQ_GROUP_NR)
+               return;
+
        if (irq_data->group >= MUIC_INT1 && irq_data->group <= MUIC_INT3)
                max77693->irq_masks_cur[irq_data->group] |= irq_data->mask;
        else
@@ -200,7 +206,7 @@ static irqreturn_t max77693_irq_thread(int irq, void *data)
 
        if (irq_src & MAX77693_IRQSRC_MUIC)
                /* MUIC INT1 ~ INT3 */
-               max77693_bulk_read(max77693->regmap, MAX77693_MUIC_REG_INT1,
+               max77693_bulk_read(max77693->regmap_muic, MAX77693_MUIC_REG_INT1,
                        MAX77693_NUM_IRQ_MUIC_REGS, &irq_reg[MUIC_INT1]);
 
        /* Apply masking */
@@ -255,7 +261,8 @@ int max77693_irq_init(struct max77693_dev *max77693)
 {
        struct irq_domain *domain;
        int i;
-       int ret;
+       int ret = 0;
+       u8 intsrc_mask;
 
        mutex_init(&max77693->irqlock);
 
@@ -287,19 +294,38 @@ int max77693_irq_init(struct max77693_dev *max77693)
                                        &max77693_irq_domain_ops, max77693);
        if (!domain) {
                dev_err(max77693->dev, "could not create irq domain\n");
-               return -ENODEV;
+               ret = -ENODEV;
+               goto err_irq;
        }
        max77693->irq_domain = domain;
 
+       /* Unmask max77693 interrupt */
+       ret = max77693_read_reg(max77693->regmap,
+                       MAX77693_PMIC_REG_INTSRC_MASK, &intsrc_mask);
+       if (ret < 0) {
+               dev_err(max77693->dev, "fail to read PMIC register\n");
+               goto err_irq;
+       }
+
+       intsrc_mask &= ~(MAX77693_IRQSRC_CHG);
+       intsrc_mask &= ~(MAX77693_IRQSRC_FLASH);
+       intsrc_mask &= ~(MAX77693_IRQSRC_MUIC);
+       ret = max77693_write_reg(max77693->regmap,
+                       MAX77693_PMIC_REG_INTSRC_MASK, intsrc_mask);
+       if (ret < 0) {
+               dev_err(max77693->dev, "fail to write PMIC register\n");
+               goto err_irq;
+       }
+
        ret = request_threaded_irq(max77693->irq, NULL, max77693_irq_thread,
                                   IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
                                   "max77693-irq", max77693);
-
        if (ret)
                dev_err(max77693->dev, "Failed to request IRQ %d: %d\n",
                        max77693->irq, ret);
 
-       return 0;
+err_irq:
+       return ret;
 }
 
 void max77693_irq_exit(struct max77693_dev *max77693)