[PATCH 2/2] MFD: MAX77693: add IRQ handler
From: Donggeun Kim
Date: Fri Dec 09 2011 - 04:15:59 EST
This patch supports IRQ handling for MAX77693.
Signed-off-by: Donggeun Kim <dg77.kim@xxxxxxxxxxx>
Signed-off-by: MyungJoo Ham <myungjoo.ham@xxxxxxxxxxx>
Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
---
drivers/mfd/Makefile | 2 +-
drivers/mfd/max77693-irq.c | 307 ++++++++++++++++++++++++++++++++++
drivers/mfd/max77693.c | 32 ++++
include/linux/mfd/max77693-private.h | 8 +
include/linux/mfd/max77693.h | 1 +
5 files changed, 349 insertions(+), 1 deletions(-)
create mode 100644 drivers/mfd/max77693-irq.c
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 3e23b81..12aef7f 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -71,7 +71,7 @@ max8925-objs := max8925-core.o max8925-i2c.o
obj-$(CONFIG_MFD_MAX8925) += max8925.o
obj-$(CONFIG_MFD_MAX8997) += max8997.o max8997-irq.o
obj-$(CONFIG_MFD_MAX8998) += max8998.o max8998-irq.o
-obj-$(CONFIG_MFD_MAX77693) += max77693.o
+obj-$(CONFIG_MFD_MAX77693) += max77693.o max77693-irq.o
pcf50633-objs := pcf50633-core.o pcf50633-irq.o
obj-$(CONFIG_MFD_PCF50633) += pcf50633.o
diff --git a/drivers/mfd/max77693-irq.c b/drivers/mfd/max77693-irq.c
new file mode 100644
index 0000000..75b5945
--- /dev/null
+++ b/drivers/mfd/max77693-irq.c
@@ -0,0 +1,307 @@
+/*
+ * max77693-irq.c - Interrupt controller support for MAX77693
+ *
+ * Copyright (C) 2011 Samsung Electronics Co.Ltd
+ * SangYoung Son <hello.son@xxxxxxxxxxx>
+ *
+ * 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/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 i2c_client *get_i2c(struct max77693_dev *max77693,
+ enum max77693_irq_source src)
+{
+ switch (src) {
+ case LED_INT ... CHG_INT:
+ return max77693->i2c;
+ case MUIC_INT1 ... MUIC_INT3:
+ return max77693->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 i2c_client *i2c = get_i2c(max77693, i);
+
+ if (mask_reg == MAX77693_REG_INVALID ||
+ IS_ERR_OR_NULL(i2c))
+ continue;
+ max77693->irq_masks_cache[i] = max77693->irq_masks_cur[i];
+
+ max77693_write_reg(i2c, 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 - max77693->irq_base];
+}
+
+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;
+
+ ret = max77693_read_reg(max77693->i2c, 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->i2c, MAX77693_CHG_REG_CHG_INT,
+ &irq_reg[CHG_INT]);
+
+ if (irq_src & MAX77693_IRQSRC_TOP)
+ /* TOPSYS_INT */
+ ret = max77693_read_reg(max77693->i2c,
+ MAX77693_PMIC_REG_TOPSYS_INT, &irq_reg[TOPSYS_INT]);
+
+ if (irq_src & MAX77693_IRQSRC_FLASH)
+ /* LED_INT */
+ ret = max77693_read_reg(max77693->i2c,
+ MAX77693_LED_REG_FLASH_INT, &irq_reg[LED_INT]);
+
+ if (irq_src & MAX77693_IRQSRC_MUIC)
+ /* MUIC INT1 ~ INT3 */
+ max77693_bulk_read(max77693->muic, 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)
+ handle_nested_irq(max77693->irq_base + i);
+ }
+
+ return IRQ_HANDLED;
+}
+
+int max77693_irq_resume(struct max77693_dev *max77693)
+{
+ if (max77693->irq && max77693->irq_base)
+ max77693_irq_thread(max77693->irq_base, max77693);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(max77693_irq_resume);
+
+int max77693_irq_init(struct max77693_dev *max77693)
+{
+ int i;
+ int cur_irq;
+ int ret;
+
+ if (!max77693->irq) {
+ dev_warn(max77693->dev, "No interrupt specified.\n");
+ max77693->irq_base = 0;
+ return 0;
+ }
+
+ if (!max77693->irq_base) {
+ dev_err(max77693->dev, "No interrupt base specified.\n");
+ return 0;
+ }
+
+ mutex_init(&max77693->irqlock);
+
+ /* Mask individual interrupt sources */
+ for (i = 0; i < MAX77693_IRQ_GROUP_NR; i++) {
+ struct i2c_client *i2c;
+ /* 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;
+ }
+ i2c = get_i2c(max77693, i);
+
+ if (IS_ERR_OR_NULL(i2c))
+ continue;
+ if (max77693_mask_reg[i] == MAX77693_REG_INVALID)
+ continue;
+ if (i >= MUIC_INT1 && i <= MUIC_INT3)
+ max77693_write_reg(i2c, max77693_mask_reg[i], 0x00);
+ else
+ max77693_write_reg(i2c, max77693_mask_reg[i], 0xff);
+ }
+
+ /* Register with genirq */
+ for (i = 0; i < MAX77693_IRQ_NR; i++) {
+ cur_irq = i + max77693->irq_base;
+ irq_set_chip_data(cur_irq, max77693);
+ irq_set_chip_and_handler(cur_irq, &max77693_irq_chip,
+ handle_edge_irq);
+ irq_set_nested_thread(cur_irq, 1);
+#ifdef CONFIG_ARM
+ set_irq_flags(cur_irq, IRQF_VALID);
+#else
+ irq_set_noprobe(cur_irq);
+#endif
+ }
+
+ 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 ret;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(max77693_irq_init);
+
+void max77693_irq_exit(struct max77693_dev *max77693)
+{
+ if (max77693->irq)
+ free_irq(max77693->irq, max77693);
+}
+EXPORT_SYMBOL_GPL(max77693_irq_exit);
diff --git a/drivers/mfd/max77693.c b/drivers/mfd/max77693.c
index 13bedba..d81ff67 100644
--- a/drivers/mfd/max77693.c
+++ b/drivers/mfd/max77693.c
@@ -143,6 +143,7 @@ static int max77693_i2c_probe(struct i2c_client *i2c,
if (!pdata)
goto err;
+ max77693->irq_base = pdata->irq_base;
max77693->wakeup = pdata->wakeup;
mutex_init(&max77693->iolock);
@@ -160,6 +161,10 @@ 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,
@@ -167,6 +172,7 @@ static int max77693_i2c_probe(struct i2c_client *i2c,
if (ret < 0)
goto err_mfd;
+ device_init_wakeup(max77693->dev, pdata->wakeup);
return ret;
@@ -196,10 +202,36 @@ 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-private.h b/include/linux/mfd/max77693-private.h
index 1625737..1078112 100644
--- a/include/linux/mfd/max77693-private.h
+++ b/include/linux/mfd/max77693-private.h
@@ -195,13 +195,21 @@ struct max77693_dev {
int type;
int irq;
+ int irq_base;
bool wakeup;
+ struct mutex irqlock;
+ int irq_masks_cur[MAX77693_IRQ_GROUP_NR];
+ int irq_masks_cache[MAX77693_IRQ_GROUP_NR];
};
enum max77693_types {
TYPE_MAX77693,
};
+extern int max77693_irq_init(struct max77693_dev *max77693);
+extern void max77693_irq_exit(struct max77693_dev *max77693);
+extern int max77693_irq_resume(struct max77693_dev *max77693);
+
extern int max77693_read_reg(struct i2c_client *i2c, u8 reg, u8 *dest);
extern int max77693_bulk_read(struct i2c_client *i2c, u8 reg, int count,
u8 *buf);
diff --git a/include/linux/mfd/max77693.h b/include/linux/mfd/max77693.h
index aba3f0f..4dafff4 100644
--- a/include/linux/mfd/max77693.h
+++ b/include/linux/mfd/max77693.h
@@ -32,6 +32,7 @@
struct max77693_platform_data {
/* IRQ */
+ int irq_base;
int wakeup;
};
#endif /* __LINUX_MFD_MAX77693_H */
--
1.7.4.1
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