linux-kernel - [PATCH 1/3] gpiolib: make gpio_to

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Date:	Fri, 8 Aug 2008 20:18:13 +0400
From:	Anton Vorontsov <avorontsov@...mvista.com>
To:	Greg Kroah-Hartman <greg@...ah.com>, linux-usb@...r.kernel.org
Cc:	David Brownell <dbrownell@...rs.sourceforge.net>,
	Li Yang <leoli@...escale.com>,
	Timur Tabi <timur@...escale.com>, linuxppc-dev@...abs.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] gpiolib: make gpio_to_chip() public

We'll need this function to write platform-specific hooks to deal
with pin's dedicated functions. Quite obviously this will work only
for the platforms with 1-to-1 GPIO to PIN mapping.

This is stopgap solution till we think out and implement a proper
api (pinlib?).

Signed-off-by: Anton Vorontsov <avorontsov@...mvista.com>
---
 drivers/gpio/gpiolib.c     |    3 ++-
 include/asm-generic/gpio.h |    1 +
 2 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 8d29405..9536fa8 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -81,10 +81,11 @@ static void gpio_ensure_requested(struct gpio_desc *desc)
 }
 
 /* caller holds gpio_lock *OR* gpio is marked as requested */
-static inline struct gpio_chip *gpio_to_chip(unsigned gpio)
+struct gpio_chip *gpio_to_chip(unsigned gpio)
 {
 	return gpio_desc[gpio].chip;
 }
+EXPORT_SYMBOL_GPL(gpio_to_chip);
 
 /* dynamic allocation of GPIOs, e.g. on a hotplugged device */
 static int gpiochip_find_base(int ngpio)
diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h
index 0f99ad3..d70ee45 100644
--- a/include/asm-generic/gpio.h
+++ b/include/asm-generic/gpio.h
@@ -81,6 +81,7 @@ struct gpio_chip {
 	unsigned		exported:1;
 };
 
+extern struct gpio_chip *gpio_to_chip(unsigned gpio);
 extern const char *gpiochip_is_requested(struct gpio_chip *chip,
 			unsigned offset);
 extern int __must_check gpiochip_reserve(int start, int ngpio);
-- 
1.5.5.4

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