mirror of
https://github.com/torvalds/linux.git
synced 2024-11-15 00:21:59 +00:00
408a4b2e0f
The CPU activity LED is now handled by the trigger in the leds subsystem, retire this old CONFIG_LEDS-based code. Signed-off-by: Bryan Wu <bryan.wu@canonical.com>
118 lines
2.3 KiB
C
118 lines
2.3 KiB
C
/*
|
|
* 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
|