You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
103 lines
2.2 KiB
103 lines
2.2 KiB
/*
|
|
* 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);
|
|
|