diff options
author | Uwe Kleine-König <u.kleine-koenig@pengutronix.de> | 2011-05-25 00:13:29 (GMT) |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-05-25 15:39:51 (GMT) |
commit | 4440673a95e63ad888a41db596edaa0c55d3a332 (patch) | |
tree | c548419177ab7b2db08bdb5fae3f62b39649d77b /drivers | |
parent | 9b2da53f7627304cd4030cb4883908bfb1bce998 (diff) | |
download | linux-4440673a95e63ad888a41db596edaa0c55d3a332.tar.xz |
leds: provide helper to register "leds-gpio" devices
This function makes a deep copy of the platform data to allow it to live
in init memory. For a kernel that supports several machines and so
includes the definition for several leds-gpio devices this saves quite
some memory because all but one definition can be free'd after boot.
As the function is used by arch code it must be builtin and so cannot go
into leds-gpio.c.
[akpm@linux-foundation.org: s/CONFIG_LED_REGISTER_GPIO/CONFIG_LEDS_REGISTER_GPIO/]
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Cc: Russell King <rmk@arm.linux.org.uk>
Acked-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Tested-by: H Hartley Sweeten <hartleys@visionengravers.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/Makefile | 2 | ||||
-rw-r--r-- | drivers/leds/Kconfig | 7 | ||||
-rw-r--r-- | drivers/leds/Makefile | 1 | ||||
-rw-r--r-- | drivers/leds/leds-gpio-register.c | 42 |
4 files changed, 51 insertions, 1 deletions
diff --git a/drivers/Makefile b/drivers/Makefile index 145aead..bceb60c 100644 --- a/drivers/Makefile +++ b/drivers/Makefile @@ -94,7 +94,7 @@ obj-$(CONFIG_CPU_IDLE) += cpuidle/ obj-$(CONFIG_DMA_ENGINE) += dma/ obj-$(CONFIG_MMC) += mmc/ obj-$(CONFIG_MEMSTICK) += memstick/ -obj-$(CONFIG_NEW_LEDS) += leds/ +obj-y += leds/ obj-$(CONFIG_INFINIBAND) += infiniband/ obj-$(CONFIG_SGI_SN) += sn/ obj-y += firmware/ diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig index a4a7773..1d027b4 100644 --- a/drivers/leds/Kconfig +++ b/drivers/leds/Kconfig @@ -14,6 +14,13 @@ config LEDS_CLASS This option enables the led sysfs class in /sys/class/leds. You'll need this to do anything useful with LEDs. If unsure, say N. +config LEDS_GPIO_REGISTER + bool + help + This option provides the function gpio_led_register_device. + As this function is used by arch code it must not be compiled as a + module. + if NEW_LEDS comment "LED drivers" diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile index 0b6ad37..bccb96c 100644 --- a/drivers/leds/Makefile +++ b/drivers/leds/Makefile @@ -21,6 +21,7 @@ obj-$(CONFIG_LEDS_COBALT_QUBE) += leds-cobalt-qube.o obj-$(CONFIG_LEDS_COBALT_RAQ) += leds-cobalt-raq.o obj-$(CONFIG_LEDS_SUNFIRE) += leds-sunfire.o obj-$(CONFIG_LEDS_PCA9532) += leds-pca9532.o +obj-$(CONFIG_LEDS_GPIO_REGISTER) += leds-gpio-register.o obj-$(CONFIG_LEDS_GPIO) += leds-gpio.o obj-$(CONFIG_LEDS_LP3944) += leds-lp3944.o obj-$(CONFIG_LEDS_LP5521) += leds-lp5521.o diff --git a/drivers/leds/leds-gpio-register.c b/drivers/leds/leds-gpio-register.c new file mode 100644 index 0000000..1c4ed55 --- /dev/null +++ b/drivers/leds/leds-gpio-register.c @@ -0,0 +1,42 @@ +/* + * Copyright (C) 2011 Pengutronix + * Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de> + * + * This program is free software; you can redistribute it and/or modify it under + * the terms of the GNU General Public License version 2 as published by the + * Free Software Foundation. + */ +#include <linux/err.h> +#include <linux/platform_device.h> +#include <linux/slab.h> +#include <linux/leds.h> + +/** + * gpio_led_register_device - register a gpio-led device + * @pdata: the platform data used for the new device + * + * Makes a copy of pdata and pdata->leds and registers a new leds-gpio device + * with the result. This allows to have pdata and pdata-leds in .init.rodata + * and so saves some bytes compared to a static struct platform_device with + * static platform data. + * + * Returns the registered device or an error pointer. + */ +struct platform_device *__init gpio_led_register_device( + int id, const struct gpio_led_platform_data *pdata) +{ + struct platform_device *ret; + struct gpio_led_platform_data _pdata = *pdata; + + _pdata.leds = kmemdup(pdata->leds, + pdata->num_leds * sizeof(*pdata->leds), GFP_KERNEL); + if (!_pdata.leds) + return ERR_PTR(-ENOMEM); + + ret = platform_device_register_resndata(NULL, "leds-gpio", id, + NULL, 0, &_pdata, sizeof(_pdata)); + if (IS_ERR(ret)) + kfree(_pdata.leds); + + return ret; +} |