mirror of https://gitee.com/openkylin/linux.git
162 lines
2.9 KiB
C
162 lines
2.9 KiB
C
/*
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* LED driver for Atmel AT91-based boards.
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*
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* Copyright (C) SAN People (Pty) Ltd
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <asm/mach-types.h>
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#include <asm/arch/board.h>
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#include <asm/arch/gpio.h>
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/* ------------------------------------------------------------------------- */
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#if defined(CONFIG_NEW_LEDS)
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#include <linux/platform_device.h>
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/*
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* New cross-platform LED support.
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*/
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static struct gpio_led_platform_data led_data;
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static struct platform_device at91_leds = {
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.name = "leds-gpio",
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.id = -1,
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.dev.platform_data = &led_data,
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};
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void __init at91_gpio_leds(struct gpio_led *leds, int nr)
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{
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int i;
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if (!nr)
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return;
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for (i = 0; i < nr; i++)
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at91_set_gpio_output(leds[i].gpio, leds[i].active_low);
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led_data.leds = leds;
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led_data.num_leds = nr;
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platform_device_register(&at91_leds);
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}
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#else
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void __init at91_gpio_leds(struct gpio_led *leds, int nr) {}
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#endif
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/* ------------------------------------------------------------------------- */
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#if defined(CONFIG_LEDS)
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#include <asm/leds.h>
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/*
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* Old ARM-specific LED framework; not fully functional when generic time is
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* in use.
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*/
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static u8 at91_leds_cpu;
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static u8 at91_leds_timer;
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static inline void at91_led_on(unsigned int led)
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{
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at91_set_gpio_value(led, 0);
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}
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static inline void at91_led_off(unsigned int led)
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{
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at91_set_gpio_value(led, 1);
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}
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static inline void at91_led_toggle(unsigned int led)
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{
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unsigned long is_off = at91_get_gpio_value(led);
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if (is_off)
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at91_led_on(led);
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else
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at91_led_off(led);
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}
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/*
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* Handle LED events.
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*/
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static void at91_leds_event(led_event_t evt)
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{
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unsigned long flags;
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local_irq_save(flags);
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switch(evt) {
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case led_start: /* System startup */
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at91_led_on(at91_leds_cpu);
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break;
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case led_stop: /* System stop / suspend */
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at91_led_off(at91_leds_cpu);
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break;
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#ifdef CONFIG_LEDS_TIMER
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case led_timer: /* Every 50 timer ticks */
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at91_led_toggle(at91_leds_timer);
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break;
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#endif
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#ifdef CONFIG_LEDS_CPU
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case led_idle_start: /* Entering idle state */
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at91_led_off(at91_leds_cpu);
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break;
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case led_idle_end: /* Exit idle state */
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at91_led_on(at91_leds_cpu);
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break;
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#endif
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default:
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break;
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}
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local_irq_restore(flags);
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}
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static int __init leds_init(void)
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{
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if (!at91_leds_timer || !at91_leds_cpu)
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return -ENODEV;
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leds_event = at91_leds_event;
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leds_event(led_start);
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return 0;
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}
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__initcall(leds_init);
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void __init at91_init_leds(u8 cpu_led, u8 timer_led)
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{
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/* Enable GPIO to access the LEDs */
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at91_set_gpio_output(cpu_led, 1);
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at91_set_gpio_output(timer_led, 1);
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at91_leds_cpu = cpu_led;
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at91_leds_timer = timer_led;
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}
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#else
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void __init at91_init_leds(u8 cpu_led, u8 timer_led) {}
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#endif
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