linux-kernel - [PATCH 4/7] gpiolib: implement dev_gpiochip

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Date:	Thu, 16 Oct 2008 21:12:59 +0400
From:	Anton Vorontsov <avorontsov@...mvista.com>
To:	linux-kernel@...r.kernel.org
Cc:	David Brownell <dbrownell@...rs.sourceforge.net>,
	"Steven A. Falco" <sfalco@...ris.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Jean Delvare <khali@...ux-fr.org>,
	David Miller <davem@...emloft.net>, i2c@...sensors.org,
	linuxppc-dev@...abs.org
Subject: [PATCH 4/7] gpiolib: implement dev_gpiochip_{add,remove} calls

Any GPIO controller that have a device associated with it is encouraged to
register/unregister the gpiochips with dev_gpiochip_*() calls.

Platform may redefine these calls to glue the gpiochips with the
architecture-specific code.

Signed-off-by: Anton Vorontsov <avorontsov@...mvista.com>
---
 include/asm-generic/gpio.h |   44 ++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 44 insertions(+), 0 deletions(-)

diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h
index 0f99ad3..f31c7ae 100644
--- a/include/asm-generic/gpio.h
+++ b/include/asm-generic/gpio.h
@@ -89,6 +89,50 @@ extern int __must_check gpiochip_reserve(int start, int ngpio);
 extern int gpiochip_add(struct gpio_chip *chip);
 extern int __must_check gpiochip_remove(struct gpio_chip *chip);
 
+/*
+ * Platforms can define their own __dev_ versions to glue gpio_chips with the
+ * architecture-specific code.
+ */
+#ifndef __dev_gpiochip_add
+#define __dev_gpiochip_add __dev_gpiochip_add
+static inline int __dev_gpiochip_add(struct device *dev,
+				     struct gpio_chip *chip)
+{
+	chip->dev = dev;
+	return gpiochip_add(chip);
+}
+#endif /* __dev_gpiochip_add */
+
+#ifndef __dev_gpiochip_remove
+#define __dev_gpiochip_remove __dev_gpiochip_remove
+static inline int __dev_gpiochip_remove(struct device *dev,
+					struct gpio_chip *chip)
+{
+	return gpiochip_remove(chip);
+}
+#endif /* __dev_gpiochip_remove */
+
+/**
+ * dev_gpiochip_add - register a gpio_chip for a device
+ * @dev: device to register gpio_chip for
+ * @chip: the chip to register
+ * Context: potentially before irqs or kmalloc will work
+ *
+ * This function takes the extra @dev argument that is used to associate
+ * the chip with a device. Otherwise it behaves the same way as the
+ * gpiochip_add().
+ */
+#define dev_gpiochip_add(dev, chip) __dev_gpiochip_add((dev), (chip))
+
+/**
+ * dev_gpiochip_remove - unregister a gpio_chip
+ * @dev: device to remove the chip from
+ * @chip: the chip to unregister
+ *
+ * Use this function to unregister the chip that was registered using
+ * dev_gpiochip_add().
+ */
+#define dev_gpiochip_remove(dev, chip) __dev_gpiochip_remove((dev), (chip))
 
 /* Always use the library code for GPIO management calls,
  * or when sleeping may be involved.
-- 
1.5.6.3

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