Implement a routine visible inside the drivers/gpio directory, that allows to inject line events for testing/debugging purposes.
Signed-off-by: Bartosz Golaszewski <[email protected]> --- drivers/gpio/gpiolib.c | 16 ++++++++++++++++ drivers/gpio/gpiolib.h | 4 ++++ 2 files changed, 20 insertions(+) diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 19b4b8b..8dde5f1 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -643,6 +643,7 @@ static int lineevent_release(struct inode *inode, struct file *filep) struct gpio_device *gdev = le->gdev; free_irq(le->irq, le); + le->desc->le = NULL; gpiod_free(le->desc); kfree(le->label); kfree(le); @@ -733,6 +734,20 @@ static irqreturn_t lineevent_irq_thread(int irq, void *p) return IRQ_HANDLED; } +void gpiod_inject_event(struct gpio_desc *desc) +{ + struct lineevent_state *le = desc->le; + unsigned long flags; + + if (le) { + /* Act as if we were in interrupt context. */ + local_irq_save(flags); + lineevent_irq_thread(-1 /* unused */, le); + local_irq_restore(flags); + } +} +EXPORT_SYMBOL(gpiod_inject_event); + static int lineevent_create(struct gpio_device *gdev, void __user *ip) { struct gpio_chip *chip = gdev->chip; @@ -794,6 +809,7 @@ static int lineevent_create(struct gpio_device *gdev, void __user *ip) if (ret) goto out_free_desc; le->desc = desc; + desc->le = le; le->eflags = eflags; if (lflags & GPIOHANDLE_REQUEST_ACTIVE_LOW) diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h index 067e5e5..3c87222 100644 --- a/drivers/gpio/gpiolib.h +++ b/drivers/gpio/gpiolib.h @@ -23,6 +23,7 @@ enum of_gpio_flags; enum gpiod_flags; enum gpio_lookup_flags; struct acpi_device; +struct lineevent_state; /** * struct gpio_device - internal state container for GPIO devices @@ -196,12 +197,15 @@ struct gpio_desc { const char *label; /* Name of the GPIO */ const char *name; + /* Private: line event context for the GPIO */ + struct lineevent_state *le; }; int gpiod_request(struct gpio_desc *desc, const char *label); void gpiod_free(struct gpio_desc *desc); int gpiod_hog(struct gpio_desc *desc, const char *name, unsigned long lflags, enum gpiod_flags dflags); +void gpiod_inject_event(struct gpio_desc *desc); /* * Return the GPIO number of the passed descriptor relative to its chip -- 2.9.3
