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From: Gregory Bean on 3 Jul 2010 15:30
Add power-management and irq_chip hooks to allow configuration
of msm-gpio irq lines as wakeup sources.

Signed-off-by: Gregory Bean <gbean(a)codeaurora.org>
---
arch/arm/mach-msm/msm7200a-gpio.c | 72 +++++++++++++++++++++++++++++++++++-
1 files changed, 70 insertions(+), 2 deletions(-)

diff --git a/arch/arm/mach-msm/msm7200a-gpio.c b/arch/arm/mach-msm/msm7200a-gpio.c
index 1f9d53c..a490765 100644
--- a/arch/arm/mach-msm/msm7200a-gpio.c
+++ b/arch/arm/mach-msm/msm7200a-gpio.c
@@ -30,6 +30,12 @@
#include <linux/slab.h>
#include "msm7200a-gpio.h"

+enum {
+ IRQ_MASK_NORMAL = 0,
+ IRQ_MASK_WAKE_ON,
+ IRQ_MASK_MAX
+};
+
struct msm_gpio_dev {
struct gpio_chip gpio_chip;
spinlock_t lock;
@@ -37,6 +43,8 @@ struct msm_gpio_dev {
unsigned irq_summary;
bool latch_level_irqs;
struct msm7200a_gpio_regs regs;
+ u32 irq_masks[IRQ_MASK_MAX];
+ int nsuspend;
};

static inline struct msm_gpio_dev *to_msm_gpio_dev(struct gpio_chip *chip)
@@ -140,7 +148,8 @@ static void msm_gpio_irq_mask(unsigned int irq)

spin_lock_irqsave(&msm_gpio->lock, irq_flags);
forget_level_irq(msm_gpio, offset);
- clr_gpio_bit(offset, msm_gpio->regs.int_en);
+ msm_gpio->irq_masks[IRQ_MASK_NORMAL] &= ~BIT(offset);
+ writel(msm_gpio->irq_masks[IRQ_MASK_NORMAL], msm_gpio->regs.int_en);
spin_unlock_irqrestore(&msm_gpio->lock, irq_flags);
}

@@ -152,7 +161,8 @@ static void msm_gpio_irq_unmask(unsigned int irq)

spin_lock_irqsave(&msm_gpio->lock, irq_flags);
forget_level_irq(msm_gpio, offset);
- set_gpio_bit(offset, msm_gpio->regs.int_en);
+ msm_gpio->irq_masks[IRQ_MASK_NORMAL] |= BIT(offset);
+ writel(msm_gpio->irq_masks[IRQ_MASK_NORMAL], msm_gpio->regs.int_en);
spin_unlock_irqrestore(&msm_gpio->lock, irq_flags);
}

@@ -194,6 +204,22 @@ static void msm_gpio_irq_mask_ack(unsigned int irq)
msm_gpio_irq_mask(irq);
}

+static int msm_gpio_irq_set_wake(unsigned int irq, unsigned int on)
+{
+ struct msm_gpio_dev *msm_gpio = get_irq_chip_data(irq);
+ unsigned offset = irq - msm_gpio->irq_base;
+ unsigned long irq_flags;
+
+ spin_lock_irqsave(&msm_gpio->lock, irq_flags);
+ if (on)
+ msm_gpio->irq_masks[IRQ_MASK_WAKE_ON] |= BIT(offset);
+ else
+ msm_gpio->irq_masks[IRQ_MASK_WAKE_ON] &= ~BIT(offset);
+ spin_unlock_irqrestore(&msm_gpio->lock, irq_flags);
+
+ return set_irq_wake(msm_gpio->irq_summary, on);
+}
+
static irqreturn_t msm_gpio_irq_handler(int irq, void *dev)
{
struct msm_gpio_dev *msm_gpio = dev;
@@ -232,6 +258,7 @@ static struct irq_chip msm_gpio_irq_chip = {
.mask_ack = msm_gpio_irq_mask_ack,
.unmask = msm_gpio_irq_unmask,
.set_type = msm_gpio_irq_set_type,
+ .set_wake = msm_gpio_irq_set_wake,
};

static int __devinit msm_gpio_probe(struct platform_device *dev)
@@ -325,12 +352,53 @@ static int __devexit msm_gpio_remove(struct platform_device *dev)
return 0;
}

+#ifdef CONFIG_PM
+static int msm_gpio_suspend(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct msm_gpio_dev *msm_gpio = platform_get_drvdata(pdev);
+ unsigned long irq_flags;
+ unsigned long irq_mask;
+
+ spin_lock_irqsave(&msm_gpio->lock, irq_flags);
+ if ((msm_gpio->nsuspend)++ == 0) {
+ irq_mask = msm_gpio->irq_masks[IRQ_MASK_NORMAL] &
+ msm_gpio->irq_masks[IRQ_MASK_WAKE_ON];
+ writel(irq_mask, msm_gpio->regs.int_en);
+ }
+ spin_unlock_irqrestore(&msm_gpio->lock, irq_flags);
+
+ return 0;
+}
+
+static int msm_gpio_resume(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct msm_gpio_dev *msm_gpio = platform_get_drvdata(pdev);
+ unsigned long irq_flags;
+
+ spin_lock_irqsave(&msm_gpio->lock, irq_flags);
+ if (--(msm_gpio->nsuspend) == 0)
+ writel(msm_gpio->irq_masks[IRQ_MASK_NORMAL],
+ msm_gpio->regs.int_en);
+ spin_unlock_irqrestore(&msm_gpio->lock, irq_flags);
+
+ return 0;
+}
+#else
+#define msm_gpio_suspend NULL
+#define msm_gpio_resume NULL
+#endif
+
+static SIMPLE_DEV_PM_OPS(msm_gpio_pm_ops, msm_gpio_suspend, msm_gpio_resume);
+
static struct platform_driver msm_gpio_driver = {
.probe = msm_gpio_probe,
.remove = __devexit_p(msm_gpio_remove),
.driver = {
.name = "msm7200a-gpio",
.owner = THIS_MODULE,
+ .pm = &msm_gpio_pm_ops,
},
};

--
1.7.0.4

--
Employee of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.
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Prev: signalfd: fill in ssi_int for posix timers and message queues
Next: arch/tile: avoid erroneous error return for PTRACE_POKEUSR.