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