mfd: Add pm8xxx irq support

Add support for the irq controller in Qualcomm 8xxx pmic. The 8xxx
interrupt controller provides control for gpio and mpp configured as
interrupts in addition to other subdevice interrupts. The interrupt
controller also provides a way to read the real time status of an
interrupt. This real time status is the only way one can get the
input values of gpio and mpp lines.

Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

3 files changed, 73 insertions, 0 deletions

diff --git a/include/linux/mfd/pm8xxx/core.h b/include/linux/mfd/pm8xxx/core.h
index 36ccb33332e..bd2f4f64e93 100644
--- a/include/linux/mfd/pm8xxx/core.h
+++ b/include/linux/mfd/pm8xxx/core.h
@@ -27,6 +27,7 @@ struct pm8xxx_drvdata {
 									int n);
 	int	(*pmic_write_buf) (const struct device *dev, u16 addr, u8 *buf,
 									int n);
+	int	(*pmic_read_irq_stat) (const struct device *dev, int irq);
 	void	*pm_chip_data;
 };
 
@@ -68,4 +69,13 @@ static inline int pm8xxx_write_buf(const struct device *dev, u16 addr, u8 *buf,
 	return dd->pmic_write_buf(dev, addr, buf, n);
 }
 
+static inline int pm8xxx_read_irq_stat(const struct device *dev, int irq)
+{
+	struct pm8xxx_drvdata *dd = dev_get_drvdata(dev);
+
+	if (!dd)
+		return -EINVAL;
+	return dd->pmic_read_irq_stat(dev, irq);
+}
+
 #endif
diff --git a/include/linux/mfd/pm8xxx/irq.h b/include/linux/mfd/pm8xxx/irq.h
new file mode 100644
index 00000000000..4b21769f448
--- /dev/null
+++ b/include/linux/mfd/pm8xxx/irq.h
@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * 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.
+ */
+/*
+ * Qualcomm PMIC irq 8xxx driver header file
+ *
+ */
+
+#ifndef __MFD_PM8XXX_IRQ_H
+#define __MFD_PM8XXX_IRQ_H
+
+#include <linux/errno.h>
+#include <linux/err.h>
+
+struct pm8xxx_irq_core_data {
+	u32		rev;
+	int		nirqs;
+};
+
+struct pm8xxx_irq_platform_data {
+	int				irq_base;
+	struct pm8xxx_irq_core_data	irq_cdata;
+	int				devirq;
+	int				irq_trigger_flag;
+};
+
+struct pm_irq_chip;
+
+#ifdef CONFIG_MFD_PM8XXX_IRQ
+int pm8xxx_get_irq_stat(struct pm_irq_chip *chip, int irq);
+struct pm_irq_chip * __devinit pm8xxx_irq_init(struct device *dev,
+				const struct pm8xxx_irq_platform_data *pdata);
+int __devexit pm8xxx_irq_exit(struct pm_irq_chip *chip);
+#else
+static inline int pm8xxx_get_irq_stat(struct pm_irq_chip *chip, int irq)
+{
+	return -ENXIO;
+}
+static inline struct pm_irq_chip * __devinit pm8xxx_irq_init(
+				const struct device *dev,
+				const struct pm8xxx_irq_platform_data *pdata)
+{
+	return ERR_PTR(-ENXIO);
+}
+static inline int __devexit pm8xxx_irq_exit(struct pm_irq_chip *chip)
+{
+	return -ENXIO;
+}
+#endif /* CONFIG_MFD_PM8XXX_IRQ */
+#endif /* __MFD_PM8XXX_IRQ_H */
diff --git a/include/linux/mfd/pm8xxx/pm8921.h b/include/linux/mfd/pm8xxx/pm8921.h
index 33fbe9c960a..d5517fd32d1 100644
--- a/include/linux/mfd/pm8xxx/pm8921.h
+++ b/include/linux/mfd/pm8xxx/pm8921.h
@@ -19,9 +19,13 @@
 #define __MFD_PM8921_H
 
 #include <linux/device.h>
+#include <linux/mfd/pm8xxx/irq.h>
+
+#define PM8921_NR_IRQS		256
 
 struct pm8921_platform_data {
 	int					irq_base;
+	struct pm8xxx_irq_platform_data		*irq_pdata;
 };
 
 #endif