diff options
author | Linus Walleij <linus.walleij@stericsson.com> | 2010-07-20 21:32:00 (GMT) |
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committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2010-07-26 09:48:29 (GMT) |
commit | b5417019a6e614f5285f9eb8f9e5b2d62395965b (patch) | |
tree | 2e5a4f4b3c761367ac02435ebcf1deda8e87ee78 /arch | |
parent | ce8962455e902ffa08d59fd2b113942eaaffb0d6 (diff) | |
download | linux-b5417019a6e614f5285f9eb8f9e5b2d62395965b.tar.xz |
ARM: 6235/2: driver for the LEDs found in the later ARM refdesigns
This adds a simple driver supporting the new LED framework with
triggers and all for the RealView and Versatile platforms. The
RealView and Versatile platform drivers were arranged to compile
for all-but-integrator as a side effect since the Integrator has
a different LED driver.
Signed-off-by: Linus Walleij <triad@df.lth.se>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch')
-rw-r--r-- | arch/arm/plat-versatile/Makefile | 7 | ||||
-rw-r--r-- | arch/arm/plat-versatile/leds.c | 103 |
2 files changed, 108 insertions, 2 deletions
diff --git a/arch/arm/plat-versatile/Makefile b/arch/arm/plat-versatile/Makefile index 9b1a668..505a8f8 100644 --- a/arch/arm/plat-versatile/Makefile +++ b/arch/arm/plat-versatile/Makefile @@ -1,4 +1,7 @@ obj-y := clock.o obj-$(CONFIG_ARM_TIMER_SP804) += timer-sp.o -obj-$(CONFIG_ARCH_REALVIEW) += sched-clock.o -obj-$(CONFIG_ARCH_VERSATILE) += sched-clock.o +# For all but the Integrator, compile these +ifeq ($(CONFIG_ARCH_INTEGRATOR),) +obj-y += sched-clock.o +obj-$(CONFIG_LEDS_CLASS) += leds.o +endif diff --git a/arch/arm/plat-versatile/leds.c b/arch/arm/plat-versatile/leds.c new file mode 100644 index 0000000..3169fa5 --- /dev/null +++ b/arch/arm/plat-versatile/leds.c @@ -0,0 +1,103 @@ +/* + * Driver for the 8 user LEDs found on the RealViews and Versatiles + * Based on DaVinci's DM365 board code + * + * License terms: GNU General Public License (GPL) version 2 + * Author: Linus Walleij <triad@df.lth.se> + */ +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/io.h> +#include <linux/slab.h> +#include <linux/leds.h> + +#include <mach/hardware.h> +#include <mach/platform.h> + +#ifdef VERSATILE_SYS_BASE +#define LEDREG (__io_address(VERSATILE_SYS_BASE) + VERSATILE_SYS_LED_OFFSET) +#endif + +#ifdef REALVIEW_SYS_BASE +#define LEDREG (__io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_LED_OFFSET) +#endif + +struct versatile_led { + struct led_classdev cdev; + u8 mask; +}; + +/* + * The triggers lines up below will only be used if the + * LED triggers are compiled in. + */ +static const struct { + const char *name; + const char *trigger; +} versatile_leds[] = { + { "versatile:0", "heartbeat", }, + { "versatile:1", "mmc0", }, + { "versatile:2", }, + { "versatile:3", }, + { "versatile:4", }, + { "versatile:5", }, + { "versatile:6", }, + { "versatile:7", }, +}; + +static void versatile_led_set(struct led_classdev *cdev, + enum led_brightness b) +{ + struct versatile_led *led = container_of(cdev, + struct versatile_led, cdev); + u32 reg = readl(LEDREG); + + if (b != LED_OFF) + reg |= led->mask; + else + reg &= ~led->mask; + writel(reg, LEDREG); +} + +static enum led_brightness versatile_led_get(struct led_classdev *cdev) +{ + struct versatile_led *led = container_of(cdev, + struct versatile_led, cdev); + u32 reg = readl(LEDREG); + + return (reg & led->mask) ? LED_FULL : LED_OFF; +} + +static int __init versatile_leds_init(void) +{ + int i; + + /* All ON */ + writel(0xff, LEDREG); + for (i = 0; i < ARRAY_SIZE(versatile_leds); i++) { + struct versatile_led *led; + + led = kzalloc(sizeof(*led), GFP_KERNEL); + if (!led) + break; + + led->cdev.name = versatile_leds[i].name; + led->cdev.brightness_set = versatile_led_set; + led->cdev.brightness_get = versatile_led_get; + led->cdev.default_trigger = versatile_leds[i].trigger; + led->mask = BIT(i); + + if (led_classdev_register(NULL, &led->cdev) < 0) { + kfree(led); + break; + } + } + + return 0; +} + +/* + * Since we may have triggers on any subsystem, defer registration + * until after subsystem_init. + */ +fs_initcall(versatile_leds_init); |