On Saturday 20 April 2013 12:50 AM, Andreas Fenkart wrote:
> When a gpio interrupt is masked, the gpio event will still be latched in
> the interrupt status register so when you unmask it later you may get an
> interrupt straight away. However, if the interrupt is disabled then gpio
> events occurring will not be latched/stored.
>
> Signed-off-by: Andreas Fenkart <[email protected]>
> ---
> drivers/gpio/gpio-omap.c | 45 ++++++++++++++++++++++++++++++++++++---------
> 1 file changed, 36 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/gpio/gpio-omap.c b/drivers/gpio/gpio-omap.c
> index 159f5c5..9ab7ba5 100644
> --- a/drivers/gpio/gpio-omap.c
> +++ b/drivers/gpio/gpio-omap.c
> @@ -780,7 +780,7 @@ static void gpio_mask_irq(struct irq_data *d)
>
> spin_lock_irqsave(&bank->lock, flags);
> _set_gpio_irqenable(bank, gpio, 0);
> - _set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), IRQ_TYPE_NONE);
> + /* latching new IRQ, but don't signal */
You can add the comment in begining of the function. Comment just
before spin_lock release will be confusing.
> spin_unlock_irqrestore(&bank->lock, flags);
> }
>
> @@ -789,24 +789,48 @@ static void gpio_unmask_irq(struct irq_data *d)
> struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
> unsigned int gpio = irq_to_gpio(bank, d->irq);
> unsigned int irq_mask = GPIO_BIT(bank, gpio);
> - u32 trigger = irqd_get_trigger_type(d);
> unsigned long flags;
>
> spin_lock_irqsave(&bank->lock, flags);
> - if (trigger)
> - _set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), trigger);
>
> - /* For level-triggered GPIOs, the clearing must be done after
> - * the HW source is cleared, thus after the handler has run */
> - if (bank->level_mask & irq_mask) {
> - _set_gpio_irqenable(bank, gpio, 0);
> + /* For level-triggered GPIOs, clear the IRQ. If the HW
> + * still needs service, IRQ will be latched again */
While at this, please fix the comment style
/*
*
*/
> + if (bank->level_mask & irq_mask)
> _clear_gpio_irqstatus(bank, gpio);
> - }
>
> _set_gpio_irqenable(bank, gpio, 1);
> spin_unlock_irqrestore(&bank->lock, flags);
> }
>
> +static void gpio_disable_irq(struct irq_data *d)
> +{
> + struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
> + unsigned int gpio = irq_to_gpio(bank, d->irq);
> + unsigned long flags;
> +
> + spin_lock_irqsave(&bank->lock, flags);
> + /* stop latching new IRQ */
Best thing is you add kernel doc for all these function and
describe them clearly. mask/unmask, disable/enable
> + _set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), IRQ_TYPE_NONE);
> + _set_gpio_irqenable(bank, gpio, 0);
> + spin_unlock_irqrestore(&bank->lock, flags);
> +}
> +
> +static void gpio_enable_irq(struct irq_data *d)
> +{
> + struct gpio_bank *bank = irq_data_get_irq_chip_data(d);
> + unsigned int gpio = irq_to_gpio(bank, d->irq);
> + unsigned int irq_mask = GPIO_BIT(bank, gpio);
> + u32 trigger = irqd_get_trigger_type(d);
> + unsigned long flags;
> +
> + spin_lock_irqsave(&bank->lock, flags);
> + if (trigger)
> + _set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), trigger);
> + _clear_gpio_irqstatus(bank, gpio);
> + _set_gpio_irqenable(bank, gpio, 1);
> + spin_unlock_irqrestore(&bank->lock, flags);
> +}
> +
> static struct irq_chip gpio_irq_chip = {
> .name = "GPIO",
> .irq_shutdown = gpio_irq_shutdown,
> @@ -815,6 +839,9 @@ static struct irq_chip gpio_irq_chip = {
> .irq_unmask = gpio_unmask_irq,
> .irq_set_type = gpio_irq_type,
> .irq_set_wake = gpio_wake_enable,
> + .irq_disable = gpio_disable_irq,
> + .irq_enable = gpio_enable_irq,
> +
Drop above extra line.
> };
>
> /*---------------------------------------------------------------------*/
>
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