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/*
* DIGITAL Shark LED control routines.
*
* Driver for the 3 user LEDs found on the Shark
* Based on Versatile and RealView machine LED code
*
* License terms: GNU General Public License (GPL) version 2
* Author: Bryan Wu <bryan.wu@canonical.com>
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/leds.h>
#include <asm/mach-types.h>
#if defined(CONFIG_NEW_LEDS) && defined(CONFIG_LEDS_CLASS)
struct shark_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;
} shark_leds[] = {
{ "shark:amber0", "default-on", }, /* Bit 5 */
{ "shark:green", "heartbeat", }, /* Bit 6 */
{ "shark:amber1", "cpu0" }, /* Bit 7 */
};
static u16 led_reg_read(void)
{
outw(0x09, 0x24);
return inw(0x26);
}
static void led_reg_write(u16 value)
{
outw(0x09, 0x24);
outw(value, 0x26);
}
static void shark_led_set(struct led_classdev *cdev,
enum led_brightness b)
{
struct shark_led *led = container_of(cdev,
struct shark_led, cdev);
u16 reg = led_reg_read();
if (b != LED_OFF)
reg |= led->mask;
else
reg &= ~led->mask;
led_reg_write(reg);
}
static enum led_brightness shark_led_get(struct led_classdev *cdev)
{
struct shark_led *led = container_of(cdev,
struct shark_led, cdev);
u16 reg = led_reg_read();
return (reg & led->mask) ? LED_FULL : LED_OFF;
}
static int __init shark_leds_init(void)
{
int i;
u16 reg;
if (!machine_is_shark())
return -ENODEV;
for (i = 0; i < ARRAY_SIZE(shark_leds); i++) {
struct shark_led *led;
led = kzalloc(sizeof(*led), GFP_KERNEL);
if (!led)
break;
led->cdev.name = shark_leds[i].name;
led->cdev.brightness_set = shark_led_set;
led->cdev.brightness_get = shark_led_get;
led->cdev.default_trigger = shark_leds[i].trigger;
/* Count in 5 bits offset */
led->mask = BIT(i + 5);
if (led_classdev_register(NULL, &led->cdev) < 0) {
kfree(led);
break;
}
}
/* Make LEDs independent of power-state */
request_region(0x24, 4, "led_reg");
reg = led_reg_read();
reg |= 1 << 10;
led_reg_write(reg);
return 0;
}
/*
* Since we may have triggers on any subsystem, defer registration
* until after subsystem_init.
*/
fs_initcall(shark_leds_init);
#endif
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