mfd: Add MAX77693 irq handler

This patch supports IRQ handling for MAX77693.

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>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

4 files changed, 342 insertions, 2 deletions

diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index db0262b34af6..d7138510c880 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -78,7 +78,7 @@ obj-$(CONFIG_PMIC_DA9052)	+= da9052-core.o
 obj-$(CONFIG_MFD_DA9052_SPI)    += da9052-spi.o
 obj-$(CONFIG_MFD_DA9052_I2C)    += da9052-i2c.o
 
-obj-$(CONFIG_MFD_MAX77693)      += max77693.o
+obj-$(CONFIG_MFD_MAX77693)      += max77693.o max77693-irq.o
 max8925-objs                    := max8925-core.o max8925-i2c.o
 obj-$(CONFIG_MFD_MAX8925)       += max8925.o
 obj-$(CONFIG_MFD_MAX8997)       += max8997.o max8997-irq.o
diff --git a/drivers/mfd/max77693-irq.c b/drivers/mfd/max77693-irq.c
new file mode 100644
index 000000000000..2b403569e0a6
--- /dev/null
+++ b/drivers/mfd/max77693-irq.c
@@ -0,0 +1,309 @@
+/*
+ * max77693-irq.c - Interrupt controller support for MAX77693
+ *
+ * Copyright (C) 2012 Samsung Electronics Co.Ltd
+ * SangYoung Son <hello.son@samsung.com>
+ *
+ * This program is not provided / owned by Maxim Integrated Products.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * This driver is based on max8997-irq.c
+ */
+
+#include <linux/err.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/irqdomain.h>
+#include <linux/mfd/max77693.h>
+#include <linux/mfd/max77693-private.h>
+
+static const u8 max77693_mask_reg[] = {
+        [LED_INT] = MAX77693_LED_REG_FLASH_INT_MASK,
+        [TOPSYS_INT] = MAX77693_PMIC_REG_TOPSYS_INT_MASK,
+        [CHG_INT] = MAX77693_CHG_REG_CHG_INT_MASK,
+        [MUIC_INT1] = MAX77693_MUIC_REG_INTMASK1,
+        [MUIC_INT2] = MAX77693_MUIC_REG_INTMASK2,
+        [MUIC_INT3] = MAX77693_MUIC_REG_INTMASK3,
+};
+
+static struct regmap *max77693_get_regmap(struct max77693_dev *max77693,
+                                enum max77693_irq_source src)
+{
+        switch (src) {
+        case LED_INT ... CHG_INT:
+                return max77693->regmap;
+        case MUIC_INT1 ... MUIC_INT3:
+                return max77693->regmap_muic;
+        default:
+                return ERR_PTR(-EINVAL);
+        }
+}
+
+struct max77693_irq_data {
+        int mask;
+        enum max77693_irq_source group;
+};
+
+#define DECLARE_IRQ(idx, _group, _mask)         \
+        [(idx)] = { .group = (_group), .mask = (_mask) }
+static const struct max77693_irq_data max77693_irqs[] = {
+        DECLARE_IRQ(MAX77693_LED_IRQ_FLED2_OPEN,        LED_INT, 1 << 0),
+        DECLARE_IRQ(MAX77693_LED_IRQ_FLED2_SHORT,       LED_INT, 1 << 1),
+        DECLARE_IRQ(MAX77693_LED_IRQ_FLED1_OPEN,        LED_INT, 1 << 2),
+        DECLARE_IRQ(MAX77693_LED_IRQ_FLED1_SHORT,       LED_INT, 1 << 3),
+        DECLARE_IRQ(MAX77693_LED_IRQ_MAX_FLASH,         LED_INT, 1 << 4),
+
+        DECLARE_IRQ(MAX77693_TOPSYS_IRQ_T120C_INT,      TOPSYS_INT, 1 << 0),
+        DECLARE_IRQ(MAX77693_TOPSYS_IRQ_T140C_INT,      TOPSYS_INT, 1 << 1),
+        DECLARE_IRQ(MAX77693_TOPSYS_IRQ_LOWSYS_INT,     TOPSYS_INT, 1 << 3),
+
+        DECLARE_IRQ(MAX77693_CHG_IRQ_BYP_I,             CHG_INT, 1 << 0),
+        DECLARE_IRQ(MAX77693_CHG_IRQ_THM_I,             CHG_INT, 1 << 2),
+        DECLARE_IRQ(MAX77693_CHG_IRQ_BAT_I,             CHG_INT, 1 << 3),
+        DECLARE_IRQ(MAX77693_CHG_IRQ_CHG_I,             CHG_INT, 1 << 4),
+        DECLARE_IRQ(MAX77693_CHG_IRQ_CHGIN_I,           CHG_INT, 1 << 6),
+
+        DECLARE_IRQ(MAX77693_MUIC_IRQ_INT1_ADC,         MUIC_INT1, 1 << 0),
+        DECLARE_IRQ(MAX77693_MUIC_IRQ_INT1_ADC_LOW,     MUIC_INT1, 1 << 1),
+        DECLARE_IRQ(MAX77693_MUIC_IRQ_INT1_ADC_ERR,     MUIC_INT1, 1 << 2),
+        DECLARE_IRQ(MAX77693_MUIC_IRQ_INT1_ADC1K,       MUIC_INT1, 1 << 3),
+
+        DECLARE_IRQ(MAX77693_MUIC_IRQ_INT2_CHGTYP,      MUIC_INT2, 1 << 0),
+        DECLARE_IRQ(MAX77693_MUIC_IRQ_INT2_CHGDETREUN,  MUIC_INT2, 1 << 1),
+        DECLARE_IRQ(MAX77693_MUIC_IRQ_INT2_DCDTMR,      MUIC_INT2, 1 << 2),
+        DECLARE_IRQ(MAX77693_MUIC_IRQ_INT2_DXOVP,       MUIC_INT2, 1 << 3),
+        DECLARE_IRQ(MAX77693_MUIC_IRQ_INT2_VBVOLT,      MUIC_INT2, 1 << 4),
+        DECLARE_IRQ(MAX77693_MUIC_IRQ_INT2_VIDRM,       MUIC_INT2, 1 << 5),
+
+        DECLARE_IRQ(MAX77693_MUIC_IRQ_INT3_EOC,         MUIC_INT3, 1 << 0),
+        DECLARE_IRQ(MAX77693_MUIC_IRQ_INT3_CGMBC,       MUIC_INT3, 1 << 1),
+        DECLARE_IRQ(MAX77693_MUIC_IRQ_INT3_OVP,         MUIC_INT3, 1 << 2),
+        DECLARE_IRQ(MAX77693_MUIC_IRQ_INT3_MBCCHG_ERR,  MUIC_INT3, 1 << 3),
+        DECLARE_IRQ(MAX77693_MUIC_IRQ_INT3_CHG_ENABLED, MUIC_INT3, 1 << 4),
+        DECLARE_IRQ(MAX77693_MUIC_IRQ_INT3_BAT_DET,     MUIC_INT3, 1 << 5),
+};
+
+static void max77693_irq_lock(struct irq_data *data)
+{
+        struct max77693_dev *max77693 = irq_get_chip_data(data->irq);
+
+        mutex_lock(&max77693->irqlock);
+}
+
+static void max77693_irq_sync_unlock(struct irq_data *data)
+{
+        struct max77693_dev *max77693 = irq_get_chip_data(data->irq);
+        int i;
+
+        for (i = 0; i < MAX77693_IRQ_GROUP_NR; i++) {
+                u8 mask_reg = max77693_mask_reg[i];
+                struct regmap *map = max77693_get_regmap(max77693, i);
+
+                if (mask_reg == MAX77693_REG_INVALID ||
+                                IS_ERR_OR_NULL(map))
+                        continue;
+                max77693->irq_masks_cache[i] = max77693->irq_masks_cur[i];
+
+                max77693_write_reg(map, max77693_mask_reg[i],
+                                max77693->irq_masks_cur[i]);
+        }
+
+        mutex_unlock(&max77693->irqlock);
+}
+
+static const inline struct max77693_irq_data *
+irq_to_max77693_irq(struct max77693_dev *max77693, int irq)
+{
+        return &max77693_irqs[irq];
+}
+
+static void max77693_irq_mask(struct irq_data *data)
+{
+        struct max77693_dev *max77693 = irq_get_chip_data(data->irq);
+        const struct max77693_irq_data *irq_data =
+                                irq_to_max77693_irq(max77693, data->irq);
+
+        if (irq_data->group >= MUIC_INT1 && irq_data->group <= MUIC_INT3)
+                max77693->irq_masks_cur[irq_data->group] &= ~irq_data->mask;
+        else
+                max77693->irq_masks_cur[irq_data->group] |= irq_data->mask;
+}
+
+static void max77693_irq_unmask(struct irq_data *data)
+{
+        struct max77693_dev *max77693 = irq_get_chip_data(data->irq);
+        const struct max77693_irq_data *irq_data =
+            irq_to_max77693_irq(max77693, data->irq);
+
+        if (irq_data->group >= MUIC_INT1 && irq_data->group <= MUIC_INT3)
+                max77693->irq_masks_cur[irq_data->group] |= irq_data->mask;
+        else
+                max77693->irq_masks_cur[irq_data->group] &= ~irq_data->mask;
+}
+
+static struct irq_chip max77693_irq_chip = {
+        .name                   = "max77693",
+        .irq_bus_lock           = max77693_irq_lock,
+        .irq_bus_sync_unlock    = max77693_irq_sync_unlock,
+        .irq_mask               = max77693_irq_mask,
+        .irq_unmask             = max77693_irq_unmask,
+};
+
+#define MAX77693_IRQSRC_CHG             (1 << 0)
+#define MAX77693_IRQSRC_TOP             (1 << 1)
+#define MAX77693_IRQSRC_FLASH           (1 << 2)
+#define MAX77693_IRQSRC_MUIC            (1 << 3)
+static irqreturn_t max77693_irq_thread(int irq, void *data)
+{
+        struct max77693_dev *max77693 = data;
+        u8 irq_reg[MAX77693_IRQ_GROUP_NR] = {};
+        u8 irq_src;
+        int ret;
+        int i, cur_irq;
+
+        ret = max77693_read_reg(max77693->regmap, MAX77693_PMIC_REG_INTSRC,
+                                &irq_src);
+        if (ret < 0) {
+                dev_err(max77693->dev, "Failed to read interrupt source: %d\n",
+                                ret);
+                return IRQ_NONE;
+        }
+
+        if (irq_src & MAX77693_IRQSRC_CHG)
+                /* CHG_INT */
+                ret = max77693_read_reg(max77693->regmap, MAX77693_CHG_REG_CHG_INT,
+                                &irq_reg[CHG_INT]);
+
+        if (irq_src & MAX77693_IRQSRC_TOP)
+                /* TOPSYS_INT */
+                ret = max77693_read_reg(max77693->regmap,
+                        MAX77693_PMIC_REG_TOPSYS_INT, &irq_reg[TOPSYS_INT]);
+
+        if (irq_src & MAX77693_IRQSRC_FLASH)
+                /* LED_INT */
+                ret = max77693_read_reg(max77693->regmap,
+                        MAX77693_LED_REG_FLASH_INT, &irq_reg[LED_INT]);
+
+        if (irq_src & MAX77693_IRQSRC_MUIC)
+                /* MUIC INT1 ~ INT3 */
+                max77693_bulk_read(max77693->regmap, MAX77693_MUIC_REG_INT1,
+                        MAX77693_NUM_IRQ_MUIC_REGS, &irq_reg[MUIC_INT1]);
+
+        /* Apply masking */
+        for (i = 0; i < MAX77693_IRQ_GROUP_NR; i++) {
+                if (i >= MUIC_INT1 && i <= MUIC_INT3)
+                        irq_reg[i] &= max77693->irq_masks_cur[i];
+                else
+                        irq_reg[i] &= ~max77693->irq_masks_cur[i];
+        }
+
+        /* Report */
+        for (i = 0; i < MAX77693_IRQ_NR; i++) {
+                if (irq_reg[max77693_irqs[i].group] & max77693_irqs[i].mask) {
+                        cur_irq = irq_find_mapping(max77693->irq_domain, i);
+                        if (cur_irq)
+                                handle_nested_irq(cur_irq);
+                }
+        }
+
+        return IRQ_HANDLED;
+}
+
+int max77693_irq_resume(struct max77693_dev *max77693)
+{
+        if (max77693->irq)
+                max77693_irq_thread(0, max77693);
+
+        return 0;
+}
+
+static int max77693_irq_domain_map(struct irq_domain *d, unsigned int irq,
+                                irq_hw_number_t hw)
+{
+        struct max77693_dev *max77693 = d->host_data;
+
+        irq_set_chip_data(irq, max77693);
+        irq_set_chip_and_handler(irq, &max77693_irq_chip, handle_edge_irq);
+        irq_set_nested_thread(irq, 1);
+#ifdef CONFIG_ARM
+        set_irq_flags(irq, IRQF_VALID);
+#else
+        irq_set_noprobe(irq);
+#endif
+        return 0;
+}
+
+static struct irq_domain_ops max77693_irq_domain_ops = {
+        .map = max77693_irq_domain_map,
+};
+
+int max77693_irq_init(struct max77693_dev *max77693)
+{
+        struct irq_domain *domain;
+        int i;
+        int ret;
+
+        mutex_init(&max77693->irqlock);
+
+        /* Mask individual interrupt sources */
+        for (i = 0; i < MAX77693_IRQ_GROUP_NR; i++) {
+                struct regmap *map;
+                /* MUIC IRQ  0:MASK 1:NOT MASK */
+                /* Other IRQ 1:MASK 0:NOT MASK */
+                if (i >= MUIC_INT1 && i <= MUIC_INT3) {
+                        max77693->irq_masks_cur[i] = 0x00;
+                        max77693->irq_masks_cache[i] = 0x00;
+                } else {
+                        max77693->irq_masks_cur[i] = 0xff;
+                        max77693->irq_masks_cache[i] = 0xff;
+                }
+                map = max77693_get_regmap(max77693, i);
+
+                if (IS_ERR_OR_NULL(map))
+                        continue;
+                if (max77693_mask_reg[i] == MAX77693_REG_INVALID)
+                        continue;
+                if (i >= MUIC_INT1 && i <= MUIC_INT3)
+                        max77693_write_reg(map, max77693_mask_reg[i], 0x00);
+                else
+                        max77693_write_reg(map, max77693_mask_reg[i], 0xff);
+        }
+
+        domain = irq_domain_add_linear(NULL, MAX77693_IRQ_NR,
+                                        &max77693_irq_domain_ops, max77693);
+        if (!domain) {
+                dev_err(max77693->dev, "could not create irq domain\n");
+                return -ENODEV;
+        }
+        max77693->irq_domain = domain;
+
+        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;
+}
+
+void max77693_irq_exit(struct max77693_dev *max77693)
+{
+        if (max77693->irq)
+                free_irq(max77693->irq, max77693);
+}
diff --git a/drivers/mfd/max77693.c b/drivers/mfd/max77693.c
index c852515e68c8..e9e4278722f3 100644
--- a/drivers/mfd/max77693.c
+++ b/drivers/mfd/max77693.c
@@ -154,6 +154,10 @@ static int max77693_i2c_probe(struct i2c_client *i2c,
         max77693->haptic = i2c_new_dummy(i2c->adapter, I2C_ADDR_HAPTIC);
         i2c_set_clientdata(max77693->haptic, max77693);
 
+        ret = max77693_irq_init(max77693);
+        if (ret < 0)
+                goto err_mfd;
+
         pm_runtime_set_active(max77693->dev);
 
         ret = mfd_add_devices(max77693->dev, -1, max77693_devs,
@@ -161,6 +165,8 @@ static int max77693_i2c_probe(struct i2c_client *i2c,
         if (ret < 0)
                 goto err_mfd;
 
+        device_init_wakeup(max77693->dev, pdata->wakeup);
+
         return ret;
 
 err_mfd:
@@ -189,10 +195,36 @@ static const struct i2c_device_id max77693_i2c_id[] = {
 };
 MODULE_DEVICE_TABLE(i2c, max77693_i2c_id);
 
+static int max77693_suspend(struct device *dev)
+{
+        struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
+        struct max77693_dev *max77693 = i2c_get_clientdata(i2c);
+
+        if (device_may_wakeup(dev))
+                irq_set_irq_wake(max77693->irq, 1);
+        return 0;
+}
+
+static int max77693_resume(struct device *dev)
+{
+        struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
+        struct max77693_dev *max77693 = i2c_get_clientdata(i2c);
+
+        if (device_may_wakeup(dev))
+                irq_set_irq_wake(max77693->irq, 0);
+        return max77693_irq_resume(max77693);
+}
+
+const struct dev_pm_ops max77693_pm = {
+        .suspend = max77693_suspend,
+        .resume = max77693_resume,
+};
+
 static struct i2c_driver max77693_i2c_driver = {
         .driver = {
                    .name = "max77693",
                    .owner = THIS_MODULE,
+                   .pm = &max77693_pm,
         },
         .probe = max77693_i2c_probe,
         .remove = max77693_i2c_remove,
diff --git a/include/linux/mfd/max77693.h b/include/linux/mfd/max77693.h
index 5020b8616daa..1d28ae90384e 100644
--- a/include/linux/mfd/max77693.h
+++ b/include/linux/mfd/max77693.h
@@ -31,7 +31,6 @@
 #define __LINUX_MFD_MAX77693_H
 
 struct max77693_platform_data {
-        /* IRQ */
         int wakeup;
 };
 #endif  /* __LINUX_MFD_MAX77693_H */