1 files changed, 165 insertions, 0 deletions
diff --git a/recipes-kernel/linux/linux-3.12.27/linux-3.12-gpio-expose-deglitch.patch b/recipes-kernel/linux/linux-3.12.27/linux-3.12-gpio-expose-deglitch.patch
new file mode 100644
index 0000000..b868a36
--- /dev/null
+++ b/recipes-kernel/linux/linux-3.12.27/linux-3.12-gpio-expose-deglitch.patch
@@ -0,0 +1,165 @@
+Index: linux-3.12.13/drivers/gpio/gpiolib.c
+===================================================================
+--- linux-3.12.13.orig/drivers/gpio/gpiolib.c	2014-04-18 09:55:28.325372866 -0500
++++ linux-3.12.13/drivers/gpio/gpiolib.c	2014-04-18 10:01:46.221371869 -0500
+@@ -90,6 +90,7 @@
+ static int gpiod_direction_input_pullup(struct gpio_desc *desc, bool pullup);
+ static int gpiod_direction_output(struct gpio_desc *desc, int value);
+ static int gpiod_direction_output_pullup(struct gpio_desc *desc, int value, bool pullup);
++static int gpiod_deglitch(struct gpio_desc *desc, bool enable);
+ static int gpiod_get_direction(const struct gpio_desc *desc);
+ static int gpiod_set_debounce(struct gpio_desc *desc, unsigned debounce);
+ static int gpiod_get_value_cansleep(const struct gpio_desc *desc);
+@@ -1539,6 +1540,9 @@
+ 					(flags & GPIOF_INIT_HIGH) ? 1 : 0);
+ 	}
+ 
++	if (flags & GPIOF_DEGLITCH)
++		err = gpiod_deglitch(desc, (flags & GPIOF_DEGLITCH) ? true : false);
++
+ 	if (err)
+ 		goto free_gpio;
+ 
+@@ -1909,6 +1913,67 @@
+ }
+ EXPORT_SYMBOL_GPL(gpio_direction_output);
+ 
++static int gpiod_deglitch(struct gpio_desc *desc, bool enable)
++{
++		unsigned long       flags;
++		struct gpio_chip    *chip;
++		int         status = -EINVAL;
++		int offset;
++
++   if (!desc || !desc->chip) {
++       pr_warn("%s: invalid GPIO\n", __func__);
++       return -EINVAL;
++   }
++
++   chip = desc->chip;
++   if (!chip->deglitch) {
++       pr_warn("%s: missing deglitch() operation\n",
++           __func__);
++       return -EIO;
++   }
++
++   spin_lock_irqsave(&gpio_lock, flags);
++
++   status = gpio_ensure_requested(desc);
++   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(chip->can_sleep);
++
++   offset = gpio_chip_hwgpio(desc);
++   if (status) {
++       status = chip->request(chip, offset);
++       if (status < 0) {
++           pr_debug("GPIO-%d: chip request fail, %d\n",
++               desc_to_gpio(desc), status);
++           /* and it's not available to anyone else ...
++            * gpio_request() is the fully clean solution.
++            */
++           goto lose;
++       }
++   }
++
++   status = chip->deglitch(chip, offset, enable);
++lose:
++   return status;
++fail:
++   spin_unlock_irqrestore(&gpio_lock, flags);
++   if (status)
++       pr_debug("%s: gpio-%d status %d\n", __func__,
++            desc_to_gpio(desc), status);
++   return status;
++}
++
++int gpio_deglitch(unsigned gpio, bool enable)
++{
++   return gpiod_deglitch(gpio_to_desc(gpio), enable);
++}
++EXPORT_SYMBOL_GPL(gpio_deglitch);
++
+ /**
+  * gpio_set_debounce - sets @debounce time for a @gpio
+  * @gpio: the gpio to set debounce time
+Index: linux-3.12.13/drivers/pinctrl/pinctrl-at91.c
+===================================================================
+--- linux-3.12.13.orig/drivers/pinctrl/pinctrl-at91.c	2014-04-18 09:55:28.325372866 -0500
++++ linux-3.12.13/drivers/pinctrl/pinctrl-at91.c	2014-04-18 10:02:45.041371714 -0500
+@@ -1171,6 +1171,17 @@
+ 	return 0;
+ }
+ 
++static int at91_gpio_set_deglitch(struct gpio_chip *chip, unsigned offset, bool enable)
++{
++	struct at91_gpio_chip *at91_gpio = to_at91_gpio_chip(chip);
++	void __iomem *pio = at91_gpio->regbase;
++	unsigned mask = 1 << offset;
++
++	at91_mux_pio3_set_deglitch(pio, mask, enable);
++
++	return 0;
++}
++
+ static int at91_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
+ {
+ 	struct at91_gpio_chip *at91_gpio = to_at91_gpio_chip(chip);
+@@ -1542,6 +1553,7 @@
+ 	.get			= at91_gpio_get,
+ 	.direction_output	= at91_gpio_direction_output,
+ 	.direction_output_pullup	= at91_gpio_direction_output_pullup,
++	.deglitch		= at91_gpio_set_deglitch,
+ 	.set			= at91_gpio_set,
+ 	.to_irq			= at91_gpio_to_irq,
+ 	.dbg_show		= at91_gpio_dbg_show,
+Index: linux-3.12.13/include/asm-generic/gpio.h
+===================================================================
+--- linux-3.12.13.orig/include/asm-generic/gpio.h	2014-04-18 09:55:28.325372866 -0500
++++ linux-3.12.13/include/asm-generic/gpio.h	2014-04-18 09:58:13.081372430 -0500
+@@ -67,6 +67,7 @@
+  *	returns either the value actually sensed, or zero
+  * @direction_output: configures signal "offset" as output, or returns error
+  * @direction_output_pullup: configures signal "offset" as output with pullup enabled, or returns error
++ * @deglitch: enables deglitch on signal "offset"
+  * @set_debounce: optional hook for setting debounce time for specified gpio in
+  *      interrupt triggered gpio chips
+  * @set: assigns output value for signal "offset"
+@@ -121,6 +122,8 @@
+ 						unsigned offset, int value);
+ 	int			(*direction_output_pullup)(struct gpio_chip *chip,
+ 						unsigned offset, int value, bool pullup);
++	int			(*deglitch)(struct gpio_chip *chip,
++						unsigned offset, bool enable);
+ 	int			(*set_debounce)(struct gpio_chip *chip,
+ 						unsigned offset, unsigned debounce);
+ 
+@@ -182,6 +185,7 @@
+ extern int gpio_direction_input_pullup(unsigned gpio, bool pullup);
+ extern int gpio_direction_output(unsigned gpio, int value);
+ extern int gpio_direction_output_pullup(unsigned gpio, int value, bool pullup);
++extern int gpio_deglitch(unsigned gpio, bool enable);
+ 
+ extern int gpio_set_debounce(unsigned gpio, unsigned debounce);
+ 
+Index: linux-3.12.13/include/linux/gpio.h
+===================================================================
+--- linux-3.12.13.orig/include/linux/gpio.h	2014-04-18 09:55:28.325372866 -0500
++++ linux-3.12.13/include/linux/gpio.h	2014-04-18 09:57:56.305372474 -0500
+@@ -13,9 +13,11 @@
+ #define GPIOF_INIT_HIGH	(1 << 1)
+ 
+ #define GPIOF_PULLUP		(2 << 0)
++#define GPIOF_DEGLITCH		(2 << 1)
+ 
+ #define GPIOF_IN		(GPIOF_DIR_IN)
+ #define GPIOF_IN_PULLUP			(GPIOF_DIR_IN | GPIOF_PULLUP)
++#define GPIOF_IN_DEGLITCH		(GPIOF_DIR_IN | GPIOF_DEGLITCH)
+ #define GPIOF_OUT_INIT_LOW	(GPIOF_DIR_OUT | GPIOF_INIT_LOW)
+ #define GPIOF_OUT_INIT_HIGH	(GPIOF_DIR_OUT | GPIOF_INIT_HIGH)
+