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| author | Linus Walleij <linus.walleij@linaro.org> | 2013-11-19 13:34:56 +0100 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2013-12-04 14:46:19 +0100 |
| commit | f41cd3c2876bd31e7c71908548ae3c7a5b7ff649 (patch) | |
| tree | 5eff4af9748e6ecfcfecba3b72f4e351e7e6d745 /drivers/gpio | |
| parent | Linux 3.13-rc1 (diff) | |
| download | linux-f41cd3c2876bd31e7c71908548ae3c7a5b7ff649.tar.xz linux-f41cd3c2876bd31e7c71908548ae3c7a5b7ff649.zip | |
gpio: lock adnp IRQs when enabling them
This uses the new API for tagging GPIO lines as in use by
IRQs. This enforces a few semantic checks on how the underlying
GPIO line is used.
Only compile tested on the lpc32xx.
ChangeLog v2->v3:
- Switch to using the startup()/shutdown() callbacks again.
Still satisfy the mask/unmask semantics.
ChangeLog v1->v2:
- Use the .enable() callback from the irq_chip
- Call .unmask() from the .enable() callback to satisfy semantics.
Cc: Lars Poeschel <poeschel@lemonage.de>
Cc: Thierry Reding <thierry.reding@avionic-design.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/gpio-adnp.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-adnp.c b/drivers/gpio/gpio-adnp.c index b204033acaeb..a7b471977dc5 100644 --- a/drivers/gpio/gpio-adnp.c +++ b/drivers/gpio/gpio-adnp.c @@ -408,6 +408,27 @@ static void adnp_irq_bus_unlock(struct irq_data *data) mutex_unlock(&adnp->irq_lock); } +static unsigned int adnp_irq_startup(struct irq_data *data) +{ + struct adnp *adnp = irq_data_get_irq_chip_data(data); + + if (gpio_lock_as_irq(&adnp->gpio, data->hwirq)) + dev_err(adnp->gpio.dev, + "unable to lock HW IRQ %lu for IRQ\n", + data->hwirq); + /* Satisfy the .enable semantics by unmasking the line */ + adnp_irq_unmask(data); + return 0; +} + +static void adnp_irq_shutdown(struct irq_data *data) +{ + struct adnp *adnp = irq_data_get_irq_chip_data(data); + + adnp_irq_mask(data); + gpio_unlock_as_irq(&adnp->gpio, data->hwirq); +} + static struct irq_chip adnp_irq_chip = { .name = "gpio-adnp", .irq_mask = adnp_irq_mask, @@ -415,6 +436,8 @@ static struct irq_chip adnp_irq_chip = { .irq_set_type = adnp_irq_set_type, .irq_bus_lock = adnp_irq_bus_lock, .irq_bus_sync_unlock = adnp_irq_bus_unlock, + .irq_startup = adnp_irq_startup, + .irq_shutdown = adnp_irq_shutdown, }; static int adnp_irq_map(struct irq_domain *domain, unsigned int irq, |