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Subject[PATCH] gpio: dwapb: Add wakeup source support
Date
This patch supports irq_set_wake for dwapb gpio. It allows GPIOs
to be configured as wakeup sources and wake the system from suspend.

Signed-off-by: Hoan Tran <hotran@apm.com>
---
drivers/gpio/gpio-dwapb.c | 23 ++++++++++++++++++++++-
1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/drivers/gpio/gpio-dwapb.c b/drivers/gpio/gpio-dwapb.c
index c07ada9..5cdb7bc 100644
--- a/drivers/gpio/gpio-dwapb.c
+++ b/drivers/gpio/gpio-dwapb.c
@@ -77,6 +77,7 @@ struct dwapb_context {
u32 int_type;
u32 int_pol;
u32 int_deb;
+ u32 wake_en;
};
#endif

@@ -295,6 +296,22 @@ static int dwapb_irq_set_type(struct irq_data *d, u32 type)
return 0;
}

+#ifdef CONFIG_PM_SLEEP
+static int dwapb_irq_set_wake(struct irq_data *d, unsigned int enable)
+{
+ struct irq_chip_generic *igc = irq_data_get_irq_chip_data(d);
+ struct dwapb_gpio *gpio = igc->private;
+ struct dwapb_context *ctx = gpio->ports[0].ctx;
+
+ if (enable)
+ ctx->wake_en |= BIT(d->hwirq);
+ else
+ ctx->wake_en &= ~BIT(d->hwirq);
+
+ return 0;
+}
+#endif
+
static int dwapb_gpio_set_debounce(struct gpio_chip *gc,
unsigned offset, unsigned debounce)
{
@@ -385,6 +402,9 @@ static void dwapb_configure_irqs(struct dwapb_gpio *gpio,
ct->chip.irq_disable = dwapb_irq_disable;
ct->chip.irq_request_resources = dwapb_irq_reqres;
ct->chip.irq_release_resources = dwapb_irq_relres;
+#ifdef CONFIG_PM_SLEEP
+ ct->chip.irq_set_wake = dwapb_irq_set_wake;
+#endif
ct->regs.ack = gpio_reg_convert(gpio, GPIO_PORTA_EOI);
ct->regs.mask = gpio_reg_convert(gpio, GPIO_INTMASK);
ct->type = IRQ_TYPE_LEVEL_MASK;
@@ -699,7 +719,8 @@ static int dwapb_gpio_suspend(struct device *dev)
ctx->int_deb = dwapb_read(gpio, GPIO_PORTA_DEBOUNCE);

/* Mask out interrupts */
- dwapb_write(gpio, GPIO_INTMASK, 0xffffffff);
+ dwapb_write(gpio, GPIO_INTMASK,
+ 0xffffffff & ~ctx->wake_en);
}
}
spin_unlock_irqrestore(&gc->bgpio_lock, flags);
--
1.9.1
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