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gpiolib: export gpiochip_irq_reqres/relres()

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GPIO drivers that do not use GPIOLIB_IRQCHIP can hook these into
the irq_request_resource and irq_release_resource callbacks of the
irq_chip so they correctly 'get' the module and lock the gpio line
for IRQ use.

This will simplify driver code.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Hans Verkuil 2018-09-08 11:23:14 +02:00 committed by Linus Walleij
parent f6d9af4770
commit 4e6b823867
2 changed files with 40 additions and 27 deletions
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65
drivers/gpio/gpiolib.c
View file

@ -1804,33 +1804,6 @@ static const struct irq_domain_ops gpiochip_domain_ops = {
.xlate = irq_domain_xlate_twocell,
};
static int gpiochip_irq_reqres(struct irq_data *d)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
int ret;
if (!try_module_get(chip->gpiodev->owner))
return -ENODEV;
ret = gpiochip_lock_as_irq(chip, d->hwirq);
if (ret) {
chip_err(chip,
"unable to lock HW IRQ %lu for IRQ\n",
d->hwirq);
module_put(chip->gpiodev->owner);
return ret;
}
return 0;
}
static void gpiochip_irq_relres(struct irq_data *d)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
gpiochip_unlock_as_irq(chip, d->hwirq);
module_put(chip->gpiodev->owner);
}
static int gpiochip_to_irq(struct gpio_chip *chip, unsigned offset)
{
if (!gpiochip_irqchip_irq_valid(chip, offset))
@ -1839,6 +1812,20 @@ static int gpiochip_to_irq(struct gpio_chip *chip, unsigned offset)
return irq_create_mapping(chip->irq.domain, offset);
}
static int gpiochip_irq_reqres(struct irq_data *d)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
return gpiochip_reqres_irq(chip, d->hwirq);
}
static void gpiochip_irq_relres(struct irq_data *d)
{
struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
gpiochip_relres_irq(chip, d->hwirq);
}
/**
* gpiochip_add_irqchip() - adds an IRQ chip to a GPIO chip
* @gpiochip: the GPIO chip to add the IRQ chip to
@ -3338,6 +3325,30 @@ bool gpiochip_line_is_irq(struct gpio_chip *chip, unsigned int offset)
}
EXPORT_SYMBOL_GPL(gpiochip_line_is_irq);
int gpiochip_reqres_irq(struct gpio_chip *chip, unsigned int offset)
{
int ret;
if (!try_module_get(chip->gpiodev->owner))
return -ENODEV;
ret = gpiochip_lock_as_irq(chip, offset);
if (ret) {
chip_err(chip, "unable to lock HW IRQ %u for IRQ\n", offset);
module_put(chip->gpiodev->owner);
return ret;
}
return 0;
}
EXPORT_SYMBOL_GPL(gpiochip_reqres_irq);
void gpiochip_relres_irq(struct gpio_chip *chip, unsigned int offset)
{
gpiochip_unlock_as_irq(chip, offset);
module_put(chip->gpiodev->owner);
}
EXPORT_SYMBOL_GPL(gpiochip_relres_irq);
bool gpiochip_line_is_open_drain(struct gpio_chip *chip, unsigned int offset)
{
if (offset >= chip->ngpio)

2
include/linux/gpio/driver.h
View file

@ -401,6 +401,8 @@ extern struct gpio_chip *gpiochip_find(void *data,
int gpiochip_lock_as_irq(struct gpio_chip *chip, unsigned int offset);
void gpiochip_unlock_as_irq(struct gpio_chip *chip, unsigned int offset);
bool gpiochip_line_is_irq(struct gpio_chip *chip, unsigned int offset);
int gpiochip_reqres_irq(struct gpio_chip *chip, unsigned int offset);
void gpiochip_relres_irq(struct gpio_chip *chip, unsigned int offset);
/* Line status inquiry for drivers */
bool gpiochip_line_is_open_drain(struct gpio_chip *chip, unsigned int offset);