Merge branch 'drm-intel-next' of git://git.kernel.org/pub/scm/linux/kernel/git/anholt...

[pandora-kernel.git] / drivers / gpio / gpiolib.c

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 05019c1..3ca3654 100644 (file)
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1106,7 +1106,7 @@ unlock:
 fail:
        /* failures here can mean systems won't boot... */
        if (status)
-               pr_err("gpiochip_add: gpios %d..%d (%s) not registered\n",
+               pr_err("gpiochip_add: gpios %d..%d (%s) failed to register\n",
                        chip->base, chip->base + chip->ngpio - 1,
                        chip->label ? : "generic");
        return status;
@@ -1447,6 +1447,49 @@ fail:
 }
 EXPORT_SYMBOL_GPL(gpio_direction_output);
 
+/**
+ * gpio_set_debounce - sets @debounce time for a @gpio
+ * @gpio: the gpio to set debounce time
+ * @debounce: debounce time is microseconds
+ */
+int gpio_set_debounce(unsigned gpio, unsigned debounce)
+{
+       unsigned long           flags;
+       struct gpio_chip        *chip;
+       struct gpio_desc        *desc = &gpio_desc[gpio];
+       int                     status = -EINVAL;
+
+       spin_lock_irqsave(&gpio_lock, flags);
+
+       if (!gpio_is_valid(gpio))
+               goto fail;
+       chip = desc->chip;
+       if (!chip || !chip->set || !chip->set_debounce)
+               goto fail;
+       gpio -= chip->base;
+       if (gpio >= chip->ngpio)
+               goto fail;
+       status = gpio_ensure_requested(desc, gpio);
+       if (status < 0)
+               goto fail;
+
+       /* now we know the gpio is valid and chip won't vanish */
+
+       spin_unlock_irqrestore(&gpio_lock, flags);
+
+       might_sleep_if(extra_checks && chip->can_sleep);
+
+       return chip->set_debounce(chip, gpio, debounce);
+
+fail:
+       spin_unlock_irqrestore(&gpio_lock, flags);
+       if (status)
+               pr_debug("%s: gpio-%d status %d\n",
+                       __func__, gpio, status);
+
+       return status;
+}
+EXPORT_SYMBOL_GPL(gpio_set_debounce);
 
 /* I/O calls are only valid after configuration completed; the relevant
  * "is this a valid GPIO" error checks should already have been done.