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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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b5417019a6
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>
104 lines
2.2 KiB
C
104 lines
2.2 KiB
C
/*
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* Driver for the 8 user LEDs found on the RealViews and Versatiles
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* Based on DaVinci's DM365 board code
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*
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* License terms: GNU General Public License (GPL) version 2
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* Author: Linus Walleij <triad@df.lth.se>
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <linux/leds.h>
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#include <mach/hardware.h>
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#include <mach/platform.h>
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#ifdef VERSATILE_SYS_BASE
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#define LEDREG (__io_address(VERSATILE_SYS_BASE) + VERSATILE_SYS_LED_OFFSET)
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#endif
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#ifdef REALVIEW_SYS_BASE
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#define LEDREG (__io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_LED_OFFSET)
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#endif
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struct versatile_led {
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struct led_classdev cdev;
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u8 mask;
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};
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/*
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* The triggers lines up below will only be used if the
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* LED triggers are compiled in.
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*/
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static const struct {
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const char *name;
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const char *trigger;
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} versatile_leds[] = {
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{ "versatile:0", "heartbeat", },
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{ "versatile:1", "mmc0", },
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{ "versatile:2", },
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{ "versatile:3", },
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{ "versatile:4", },
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{ "versatile:5", },
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{ "versatile:6", },
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{ "versatile:7", },
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};
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static void versatile_led_set(struct led_classdev *cdev,
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enum led_brightness b)
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{
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struct versatile_led *led = container_of(cdev,
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struct versatile_led, cdev);
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u32 reg = readl(LEDREG);
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if (b != LED_OFF)
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reg |= led->mask;
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else
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reg &= ~led->mask;
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writel(reg, LEDREG);
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}
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static enum led_brightness versatile_led_get(struct led_classdev *cdev)
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{
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struct versatile_led *led = container_of(cdev,
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struct versatile_led, cdev);
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u32 reg = readl(LEDREG);
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return (reg & led->mask) ? LED_FULL : LED_OFF;
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}
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static int __init versatile_leds_init(void)
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{
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int i;
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/* All ON */
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writel(0xff, LEDREG);
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for (i = 0; i < ARRAY_SIZE(versatile_leds); i++) {
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struct versatile_led *led;
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led = kzalloc(sizeof(*led), GFP_KERNEL);
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if (!led)
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break;
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led->cdev.name = versatile_leds[i].name;
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led->cdev.brightness_set = versatile_led_set;
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led->cdev.brightness_get = versatile_led_get;
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led->cdev.default_trigger = versatile_leds[i].trigger;
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led->mask = BIT(i);
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if (led_classdev_register(NULL, &led->cdev) < 0) {
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kfree(led);
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break;
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}
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}
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return 0;
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}
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/*
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* Since we may have triggers on any subsystem, defer registration
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* until after subsystem_init.
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*/
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fs_initcall(versatile_leds_init);
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