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gpio: omap: rework omap_gpio_irq_startup to handle current pin state properly 

The omap_gpio_irq_startup() can be called at time when:
- corresponding GPIO has been requested already and in this case
it has to be configured as input already. If not - return with -EINVAL
and do not try to re-configure it as it could be unsafe.
- corresponding GPIO is free: reconfigure GPIO as input.

In addition, call omap_enable_gpio_module directly as all needed
checks are already present inside it.

Signed-off-by: Grygorii Strashko <grygorii.strashko@linaro.org>
Tested-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Grygorii Strashko 2015-05-22 17:35:52 +03:00 committed by Linus Walleij
parent c351817212
commit 121dcb7604
1 changed files with 13 additions and 1 deletions
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14
drivers/gpio/gpio-omap.c
View File

@ -790,11 +790,23 @@ static unsigned int omap_gpio_irq_startup(struct irq_data *d)
pm_runtime_get_sync(bank->dev);
spin_lock_irqsave(&bank->lock, flags);
omap_gpio_init_irq(bank, offset);
if (!LINE_USED(bank->mod_usage, offset))
omap_set_gpio_direction(bank, offset, 1);
else if (!omap_gpio_is_input(bank, offset))
goto err;
omap_enable_gpio_module(bank, offset);
bank->irq_usage |= BIT(offset);
spin_unlock_irqrestore(&bank->lock, flags);
omap_gpio_unmask_irq(d);
return 0;
err:
spin_unlock_irqrestore(&bank->lock, flags);
if (!BANK_USED(bank))
pm_runtime_put(bank->dev);
return -EINVAL;
}
static void omap_gpio_irq_shutdown(struct irq_data *d)