138 lines
3.5 KiB
C
138 lines
3.5 KiB
C
/*
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* gpio LED support for barebox
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*
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* (C) Copyright 2010 Sascha Hauer, Pengutronix
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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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 as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <common.h>
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#include <led.h>
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#include <asm/gpio.h>
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static void led_gpio_set(struct led *led, unsigned int value)
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{
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struct gpio_led *gpio_led = container_of(led, struct gpio_led, led);
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gpio_direction_output(gpio_led->gpio, !!value ^ gpio_led->active_low);
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}
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/**
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* led_gpio_register - register a gpio controlled LED
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* @param led The gpio LED
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*
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* This function registers a single gpio as a LED. led->gpio
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* should be initialized to the gpio to control.
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*/
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int led_gpio_register(struct gpio_led *led)
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{
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led->led.set = led_gpio_set;
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led->led.max_value = 1;
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return led_register(&led->led);
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}
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/**
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* led_gpio_unregister - remove a gpio controlled LED from the framework
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* @param led The gpio LED
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*/
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void led_gpio_unregister(struct gpio_led *led)
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{
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led_unregister(&led->led);
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}
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#ifdef CONFIG_LED_GPIO_BICOLOR
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static void led_gpio_bicolor_set(struct led *led, unsigned int value)
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{
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struct gpio_bicolor_led *bi = container_of(led, struct gpio_bicolor_led, led);
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int al = bi->active_low;
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switch (value) {
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case 0:
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gpio_direction_output(bi->gpio_c0, al);
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gpio_direction_output(bi->gpio_c1, al);
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break;
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case 1:
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gpio_direction_output(bi->gpio_c0, !al);
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gpio_direction_output(bi->gpio_c1, al);
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break;
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case 2:
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gpio_direction_output(bi->gpio_c0, al);
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gpio_direction_output(bi->gpio_c1, !al);
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break;
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}
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}
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/**
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* led_gpio_bicolor_register - register three gpios as a bicolor LED
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* @param led The gpio bicolor LED
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*
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* This function registers three gpios as a bicolor LED. led->gpio[rg]
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* should be initialized to the gpios to control.
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*/
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int led_gpio_bicolor_register(struct gpio_bicolor_led *led)
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{
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led->led.set = led_gpio_bicolor_set;
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led->led.max_value = 2;
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return led_register(&led->led);
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}
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/**
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* led_gpio_bicolor_unregister - remove a gpio controlled bicolor LED from the framework
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* @param led The gpio LED
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*/
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void led_gpio_bicolor_unregister(struct gpio_bicolor_led *led)
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{
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led_unregister(&led->led);
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}
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#endif
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#ifdef CONFIG_LED_GPIO_RGB
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static void led_gpio_rgb_set(struct led *led, unsigned int value)
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{
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struct gpio_rgb_led *rgb = container_of(led, struct gpio_rgb_led, led);
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int al = rgb->active_low;
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gpio_direction_output(rgb->gpio_r, !!(value & 4) ^ al);
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gpio_direction_output(rgb->gpio_g, !!(value & 2) ^ al);
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gpio_direction_output(rgb->gpio_b, !!(value & 1) ^ al);
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}
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/**
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* led_gpio_rgb_register - register three gpios as a rgb LED
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* @param led The gpio rg LED
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*
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* This function registers three gpios as a rgb LED. led->gpio[rgb]
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* should be initialized to the gpios to control.
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*/
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int led_gpio_rgb_register(struct gpio_rgb_led *led)
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{
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led->led.set = led_gpio_rgb_set;
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led->led.max_value = 7;
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return led_register(&led->led);
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}
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/**
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* led_gpio_rgb_unregister - remove a gpio controlled rgb LED from the framework
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* @param led The gpio LED
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*/
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void led_gpio_rgb_unregister(struct gpio_led *led)
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{
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led_unregister(&led->led);
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}
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#endif /* CONFIG_LED_GPIO_RGB */
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