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Date: Fri, 25 Nov 2011 15:08:40 +0100
From: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
To: linux-kernel@...r.kernel.org
Cc: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>,
Nicolas Ferre <nicolas.ferre@...el.com>,
Grant Likely <grant.likely@...retlab.ca>
Subject: [PATCH 2/2] gpiolib: introduce gpio_set_deglitch
this will allow to manage the Glitch Input Filter
as present on AT91 as example
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>
Cc: Nicolas Ferre <nicolas.ferre@...el.com>
Cc: Grant Likely <grant.likely@...retlab.ca>
---
drivers/gpio/gpiolib.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
include/asm-generic/gpio.h | 4 ++++
include/linux/gpio.h | 5 +++++
3 files changed, 53 insertions(+), 0 deletions(-)
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index b7e5e75..d2b1833 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1563,6 +1563,50 @@ fail:
}
EXPORT_SYMBOL_GPL(gpio_set_pullup);
+/**
+ * gpio_set_deglitch - sets @deglitch for a @gpio
+ * @gpio: the gpio to set deglitch
+ * @deglitch: deglitch level
+ */
+int gpio_set_deglitch(unsigned gpio, unsigned deglitch)
+{
+ 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_deglitch)
+ 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(chip->can_sleep);
+
+ return chip->set_deglitch(chip, gpio, deglitch);
+
+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_deglitch);
+
/* I/O calls are only valid after configuration completed; the relevant
* "is this a valid GPIO" error checks should already have been done.
*
diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h
index 085ef16..20a9786 100644
--- a/include/asm-generic/gpio.h
+++ b/include/asm-generic/gpio.h
@@ -110,6 +110,9 @@ struct gpio_chip {
int (*set_pullup)(struct gpio_chip *chip,
unsigned offset, unsigned pullup);
+ int (*set_deglitch)(struct gpio_chip *chip,
+ unsigned offset, unsigned deglitch);
+
void (*set)(struct gpio_chip *chip,
unsigned offset, int value);
@@ -159,6 +162,7 @@ extern int gpio_direction_output(unsigned gpio, int value);
extern int gpio_set_debounce(unsigned gpio, unsigned debounce);
extern int gpio_set_pullup(unsigned gpio, unsigned pullup);
+extern int gpio_set_deglitch(unsigned gpio, unsigned deglitch);
extern int gpio_get_value_cansleep(unsigned gpio);
extern void gpio_set_value_cansleep(unsigned gpio, int value);
diff --git a/include/linux/gpio.h b/include/linux/gpio.h
index 5c786e7..bfbc3d7 100644
--- a/include/linux/gpio.h
+++ b/include/linux/gpio.h
@@ -95,6 +95,11 @@ static inline int gpio_set_pullup(unsigned gpio, unsigned pullup)
return -ENOSYS;
}
+static inline int gpio_set_deglitch(unsigned gpio, unsigned deglitch)
+{
+ return -ENOSYS;
+}
+
static inline int gpio_get_value(unsigned gpio)
{
/* GPIO can never have been requested or set as {in,out}put */
--
1.7.7
--
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