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Message-ID: <20090615171502.2a981bf5@dxy.sh.intel.com>
Date: Mon, 15 Jun 2009 17:15:02 +0800
From: Alek Du <alek.du@...el.com>
To: Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH] gpiolib: Add gpio_detect, gpio_debounce and gpio_alt_func
features to GPIOLIB
>From 7a76916ccea4a376a260ea67fbc79ac4d958757f Mon Sep 17 00:00:00 2001
From: Alek Du <alek.du@...el.com>
Date: Fri, 8 May 2009 09:46:49 +0800
Subject: [PATCH] gpiolib: Add gpio_detect, gpio_debounce and gpio_alt_func features to GPIOLIB
Add some more functions to GPIOLIB, they are:
* gpio_detect is to set GPIO interrupt triggering method (edge, level, high,
low, etc.)
* gpio_debounce is to set GPIO trigger HW debounce value if GPIO hw supports.
* gpio_alt_func is to set pin as alternative function or GPIO.
We will submit GPIO drivers that leverage this new interface later.
Signed-off-by: Alek Du <alek.du@...el.com>
---
drivers/gpio/gpiolib.c | 33 +++++++++++++++++++++++++++++++++
include/asm-generic/gpio.h | 25 ++++++++++++++++++++++++-
include/linux/gpio.h | 15 +++++++++++++++
3 files changed, 72 insertions(+), 1 deletions(-)
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 51a8d41..087efce 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1066,6 +1066,39 @@ void __gpio_set_value(unsigned gpio, int value)
}
EXPORT_SYMBOL_GPL(__gpio_set_value);
+void gpio_detect(unsigned gpio, enum gpio_trigger_t value)
+{
+ struct gpio_chip *chip;
+
+ chip = gpio_to_chip(gpio);
+ WARN_ON(extra_checks && chip->can_sleep);
+ if (chip->detect)
+ chip->detect(chip, gpio - chip->base, value);
+}
+EXPORT_SYMBOL_GPL(gpio_detect);
+
+void gpio_debounce(unsigned gpio, int value)
+{
+ struct gpio_chip *chip;
+
+ chip = gpio_to_chip(gpio);
+ WARN_ON(extra_checks && chip->can_sleep);
+ if (chip->debounce)
+ chip->debounce(chip, gpio - chip->base, value);
+}
+EXPORT_SYMBOL_GPL(gpio_debounce);
+
+void gpio_alt_func(unsigned gpio, int value)
+{
+ struct gpio_chip *chip;
+
+ chip = gpio_to_chip(gpio);
+ WARN_ON(extra_checks && chip->can_sleep);
+ if (chip->alt_func)
+ chip->alt_func(chip, gpio - chip->base, value);
+}
+EXPORT_SYMBOL_GPL(gpio_alt_func);
+
/**
* __gpio_cansleep() - report whether gpio value access will sleep
* @gpio: gpio in question
diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h
index d6c379d..de9aaf9 100644
--- a/include/asm-generic/gpio.h
+++ b/include/asm-generic/gpio.h
@@ -30,6 +30,15 @@ static inline int gpio_is_valid(int number)
struct seq_file;
struct module;
+enum gpio_trigger_t {
+ DETECT_LEVEL_LOW = -2,
+ DETECT_EDGE_FALLING = -1,
+ DETECT_DISABLE = 0,
+ DETECT_EDGE_RISING = 1,
+ DETECT_LEVEL_HIGH = 2,
+ DETECT_EDGE_BOTH = 3,
+};
+
/**
* struct gpio_chip - abstract a GPIO controller
* @label: for diagnostics
@@ -44,6 +53,9 @@ struct module;
* returns either the value actually sensed, or zero
* @direction_output: configures signal "offset" as output, or returns error
* @set: assigns output value for signal "offset"
+ * @detect: configures signal interrupt detection method, see gpio_trigger_t
+ * @debounce: configures signal interrupt detection debounce
+ * @alt_func: configure signal as GPIO or alternative function
* @to_irq: optional hook supporting non-static gpio_to_irq() mappings;
* implementation may not sleep
* @dbg_show: optional routine to show contents in debugfs; default code
@@ -89,6 +101,15 @@ struct gpio_chip {
void (*set)(struct gpio_chip *chip,
unsigned offset, int value);
+ void (*detect)(struct gpio_chip *chip,
+ unsigned offset,
+ enum gpio_trigger_t value);
+ void (*debounce)(struct gpio_chip *chip,
+ unsigned offset,
+ int value);
+ void (*alt_func)(struct gpio_chip *chip,
+ unsigned offset, int value);
+
int (*to_irq)(struct gpio_chip *chip,
unsigned offset);
@@ -118,7 +139,9 @@ extern void gpio_free(unsigned gpio);
extern int gpio_direction_input(unsigned gpio);
extern int gpio_direction_output(unsigned gpio, int value);
-
+extern void gpio_detect(unsigned gpio, enum gpio_trigger_t value);
+extern void gpio_debounce(unsigned gpio, int value);
+extern void gpio_alt_func(unsigned gpio, int value);
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 e10c49a..76dd5f9 100644
--- a/include/linux/gpio.h
+++ b/include/linux/gpio.h
@@ -82,6 +82,21 @@ static inline void gpio_set_value_cansleep(unsigned gpio, int value)
WARN_ON(1);
}
+static inline void gpio_detect(unsigned gpio, int value)
+{
+ WARN_ON(1);
+}
+
+static inline void gpio_debounce(unsigned gpio, int value)
+{
+ WARN_ON(1);
+}
+
+static inline void gpio_alt_func(unsigned gpio, int value)
+{
+ WARN_ON(1);
+}
+
static inline int gpio_export(unsigned gpio, bool direction_may_change)
{
/* GPIO can never have been requested or set as {in,out}put */
--
1.6.0.4
--
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