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From: Anton Vorontsov <avorontsov@ru.mvista.com> To: linux-kernel@vger.kernel.org Cc: David Brownell <dbrownell@users.sourceforge.net>, "Steven A. Falco" <sfalco@harris.com>, Grant Likely <grant.likely@secretlab.ca>, Jean Delvare <khali@linux-fr.org>, David Miller <davem@davemloft.net>, i2c@lm-sensors.org, linuxppc-dev@ozlabs.org Subject: [PATCH 5/7] of/gpio: implement of_dev_gpiochip_{add,remove} calls Date: Thu, 16 Oct 2008 21:13:03 +0400 [thread overview] Message-ID: <20081016171303.GE5515@oksana.dev.rtsoft.ru> (raw) In-Reply-To: <20081016171222.GA24812@oksana.dev.rtsoft.ru> And let the gpiolib forward all dev_gpiochip_ calls to of_ versions, there we can glue the gpiochips with the device tree. Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com> --- arch/powerpc/include/asm/gpio.h | 7 +++- drivers/of/gpio.c | 75 +++++++++++++++++++++++++++++++++++++- include/linux/of_gpio.h | 7 ++++ 3 files changed, 86 insertions(+), 3 deletions(-) diff --git a/arch/powerpc/include/asm/gpio.h b/arch/powerpc/include/asm/gpio.h index ea04632..92610b1 100644 --- a/arch/powerpc/include/asm/gpio.h +++ b/arch/powerpc/include/asm/gpio.h @@ -14,8 +14,13 @@ #ifndef __ASM_POWERPC_GPIO_H #define __ASM_POWERPC_GPIO_H -#include <linux/errno.h> +/* Tell the gpiolib that we'll handle the dev_gpiochip_* calls. */ +#define __dev_gpiochip_add of_dev_gpiochip_add +#define __dev_gpiochip_remove of_dev_gpiochip_remove + #include <asm-generic/gpio.h> +#include <linux/errno.h> +#include <linux/of_gpio.h> #ifdef CONFIG_GPIOLIB diff --git a/drivers/of/gpio.c b/drivers/of/gpio.c index 7cd7301..b6f56af 100644 --- a/drivers/of/gpio.c +++ b/drivers/of/gpio.c @@ -12,12 +12,33 @@ */ #include <linux/kernel.h> +#include <linux/device.h> #include <linux/errno.h> #include <linux/io.h> #include <linux/of.h> #include <linux/of_gpio.h> #include <asm/prom.h> +static struct gpio_chip *of_gc_to_gc(struct of_gpio_chip *of_gc) +{ + /* + * Currently there are two ways to register OF GPIO controllers: + * + * 1. Allocating the of_gpio_chip structure and passing the + * &of_gc->gc pointer to the gpiochip_add. (Can use container_of + * to convert the gpio_chip to the of_gpio_chip.) + * + * 2. Allocating and registering the gpio_chip structure separately + * from the of_gpio_chip. (Since two allocations are separate, + * container_of won't work.) + * + * As time goes by we may kill the first option. + */ + if (of_gc->chip) + return of_gc->chip; + return &of_gc->gc; +} + /** * of_get_gpio - Get a GPIO number from the device tree to use with GPIO API * @np: device node to get GPIO from @@ -63,7 +84,7 @@ int of_get_gpio(struct device_node *np, int index) if (ret < 0) goto err1; - ret += of_gc->gc.base; + ret += of_gc_to_gc(of_gc)->base; err1: of_node_put(gc); err0: @@ -87,7 +108,7 @@ int of_gpio_simple_xlate(struct of_gpio_chip *of_gc, struct device_node *np, { const u32 *gpio = gpio_spec; - if (*gpio > of_gc->gc.ngpio) + if (*gpio > of_gc_to_gc(of_gc)->ngpio) return -EINVAL; return *gpio; @@ -161,3 +182,53 @@ err0: return ret; } EXPORT_SYMBOL(of_mm_gpiochip_add); + +int of_dev_gpiochip_add(struct device *dev, struct gpio_chip *chip) +{ + struct device_node *np = dev_archdata_get_node(&dev->archdata); + struct of_gpio_chip *of_gc; + int ret; + + if (!np || np->data) + return -EINVAL; + + of_gc = kzalloc(sizeof(*of_gc), GFP_KERNEL); + if (!of_gc) + return -ENOMEM; + /* + * NOTE: for simple cases we use the simple_xlate with 2 cells scheme. + * You can always overwrite it with an exceptions list that would + * match on of_device_is_compatible(). + */ + of_gc->gpio_cells = 2; + of_gc->xlate = of_gpio_simple_xlate; + + chip->dev = dev; + of_gc->chip = chip; + np->data = of_gc; + + ret = gpiochip_add(chip); + if (ret) + goto err_gpiochip_add; + return 0; + +err_gpiochip_add: + np->data = NULL; + chip->dev = NULL; + kfree(of_gc); + return ret; +} +EXPORT_SYMBOL(of_dev_gpiochip_add); + +int of_dev_gpiochip_remove(struct device *dev, struct gpio_chip *chip) +{ + struct device_node *np = dev_archdata_get_node(&dev->archdata); + int ret; + + ret = gpiochip_remove(chip); + if (ret) + return ret; + np->data = NULL; + return 0; +} +EXPORT_SYMBOL(of_dev_gpiochip_remove); diff --git a/include/linux/of_gpio.h b/include/linux/of_gpio.h index 67db101..273cd79 100644 --- a/include/linux/of_gpio.h +++ b/include/linux/of_gpio.h @@ -14,16 +14,21 @@ #ifndef __LINUX_OF_GPIO_H #define __LINUX_OF_GPIO_H +#include <linux/compiler.h> #include <linux/errno.h> #include <linux/gpio.h> #ifdef CONFIG_OF_GPIO +struct device_node; +struct device; + /* * Generic OF GPIO chip */ struct of_gpio_chip { struct gpio_chip gc; + struct gpio_chip *chip; int gpio_cells; int (*xlate)(struct of_gpio_chip *of_gc, struct device_node *np, const void *gpio_spec); @@ -53,6 +58,8 @@ static inline struct of_mm_gpio_chip *to_of_mm_gpio_chip(struct gpio_chip *gc) extern int of_get_gpio(struct device_node *np, int index); extern int of_mm_gpiochip_add(struct device_node *np, struct of_mm_gpio_chip *mm_gc); +extern int of_dev_gpiochip_add(struct device *dev, struct gpio_chip *chip); +extern int of_dev_gpiochip_remove(struct device *dev, struct gpio_chip *chip); extern int of_gpio_simple_xlate(struct of_gpio_chip *of_gc, struct device_node *np, const void *gpio_spec); -- 1.5.6.3
next prev parent reply other threads:[~2008-10-16 17:14 UTC|newest] Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top 2008-10-16 17:12 [PATCH 0/7 RFC] Handle I2C GPIO controllers with the OF (was: pca9539 I2C gpio expander) Anton Vorontsov 2008-10-16 17:12 ` [PATCH 1/7] powerpc and sparc: introduce dev_archdata node accessors Anton Vorontsov 2008-10-16 22:36 ` David Miller 2008-10-16 23:02 ` Grant Likely 2008-10-16 17:12 ` [PATCH 2/7] i2c: add info->archdata field Anton Vorontsov 2008-10-17 9:21 ` Jean Delvare 2008-10-22 0:27 ` Benjamin Herrenschmidt 2008-10-22 6:50 ` Jean Delvare 2008-10-22 7:37 ` Benjamin Herrenschmidt 2008-10-22 10:08 ` Anton Vorontsov 2008-10-22 11:07 ` Jean Delvare 2008-10-22 12:50 ` Anton Vorontsov 2008-10-16 17:12 ` [PATCH 3/7] of: fill the archdata for I2C devices Anton Vorontsov 2008-10-22 4:14 ` Grant Likely 2008-10-16 17:12 ` [PATCH 4/7] gpiolib: implement dev_gpiochip_{add,remove} calls Anton Vorontsov 2008-10-17 20:24 ` David Brownell 2008-10-17 21:29 ` Anton Vorontsov 2008-10-20 7:29 ` David Brownell 2008-10-20 15:48 ` Anton Vorontsov 2008-10-22 0:29 ` Benjamin Herrenschmidt 2008-10-22 1:03 ` Anton Vorontsov 2008-10-22 1:42 ` Anton Vorontsov 2008-10-22 2:28 ` Benjamin Herrenschmidt 2008-10-22 4:20 ` Grant Likely 2008-10-22 4:22 ` David Brownell 2008-10-22 10:36 ` Anton Vorontsov 2008-10-22 10:46 ` Anton Vorontsov 2008-10-22 18:32 ` Anton Vorontsov 2008-10-22 21:04 ` David Brownell 2008-10-22 21:22 ` Anton Vorontsov 2008-10-22 21:52 ` David Brownell 2008-10-22 22:29 ` Anton Vorontsov 2008-10-23 5:19 ` David Brownell 2008-10-23 4:45 ` Benjamin Herrenschmidt 2008-10-23 6:06 ` David Brownell 2008-10-23 6:15 ` David Brownell 2008-10-28 17:45 ` [PATCH 0/6 RFC] OF-glue devices for I2C/SPI (was: " Anton Vorontsov 2008-10-28 17:46 ` [PATCH 1/6] of/base: Add new helper of_should_create_pdev() Anton Vorontsov 2008-10-28 17:46 ` [PATCH 2/6] of/of_i2c: implement of_{,un}register_i2c_device Anton Vorontsov 2008-10-28 17:46 ` [PATCH 3/6] of/of_i2c: add support for dedicated OF I2C devices Anton Vorontsov 2008-10-28 18:41 ` David Miller 2008-10-28 17:46 ` [PATCH 4/6] of/gpio: add support for two-stage registration for the of_gpio_chips Anton Vorontsov 2008-10-28 17:46 ` [PATCH 5/6] gpio/pca953x: pass gpio_chip pointer to the setup/teardown callbacks Anton Vorontsov 2008-10-28 17:46 ` [PATCH 6/6] gpio: OpenFirmware bindings for the pca953x Anton Vorontsov 2008-10-28 17:53 ` [PATCH 0/6 RFC] OF-glue devices for I2C/SPI (was: Re: [PATCH 4/7] gpiolib: implement dev_gpiochip_{add,remove} calls Grant Likely 2008-10-22 2:27 ` Benjamin Herrenschmidt 2008-10-16 17:13 ` Anton Vorontsov [this message] 2008-10-17 20:25 ` [PATCH 5/7] of/gpio: implement of_dev_gpiochip_{add,remove} calls David Brownell 2008-10-17 21:13 ` Anton Vorontsov 2008-10-16 17:13 ` [PATCH 6/7] gpio/pca953x: convert to dev_gpiochip_add and make it work with the OF Anton Vorontsov 2008-10-16 17:13 ` [PATCH 7/7] i2c/mcu_mpc8349emitx: convert to the new I2C/OF/GPIO infrastructure Anton Vorontsov 2008-10-17 16:07 ` [PATCH 0/7 RFC] Handle I2C GPIO controllers with the OF (was: pca9539 I2C gpio expander) Steven A. Falco
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