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