282 lines
6.4 KiB
C
282 lines
6.4 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 <init.h>
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#include <led.h>
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#include <malloc.h>
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#include <gpio.h>
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#include <of_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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int ret;
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char *name = led->led.name;
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ret = gpio_request(led->gpio, name ? name : "led");
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if (ret)
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return ret;
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led->led.set = led_gpio_set;
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led->led.max_value = 1;
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ret = led_register(&led->led);
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if (ret)
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gpio_free(led->gpio);
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return ret;
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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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gpio_free(led->gpio);
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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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int ret;
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char *name = led->led.name;
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ret = gpio_request(led->gpio_c0, name ? name : "led_c0");
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if (ret)
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return ret;
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ret = gpio_request(led->gpio_c1, name ? name : "led_c1");
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if (ret)
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goto err_gpio_c0;
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led->led.set = led_gpio_bicolor_set;
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led->led.max_value = 2;
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ret = led_register(&led->led);
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if (ret)
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goto err_gpio_c1;
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return 0;
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err_gpio_c1:
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gpio_free(led->gpio_c1);
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err_gpio_c0:
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gpio_free(led->gpio_c0);
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return ret;
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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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gpio_free(led->gpio_c1);
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gpio_free(led->gpio_c0);
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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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int ret;
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char *name = led->led.name;
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ret = gpio_request(led->gpio_r, name ? name : "led_r");
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if (ret)
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return ret;
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ret = gpio_request(led->gpio_g, name ? name : "led_g");
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if (ret)
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goto err_gpio_r;
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ret = gpio_request(led->gpio_b, name ? name : "led_b");
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if (ret)
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goto err_gpio_g;
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led->led.set = led_gpio_rgb_set;
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led->led.max_value = 7;
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ret = led_register(&led->led);
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if (ret)
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goto err_gpio_b;
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return 0;
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err_gpio_b:
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gpio_free(led->gpio_b);
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err_gpio_g:
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gpio_free(led->gpio_g);
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err_gpio_r:
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gpio_free(led->gpio_r);
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return ret;
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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_rgb_led *led)
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{
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led_unregister(&led->led);
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gpio_free(led->gpio_b);
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gpio_free(led->gpio_g);
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gpio_free(led->gpio_r);
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}
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#endif /* CONFIG_LED_GPIO_RGB */
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#ifdef CONFIG_LED_GPIO_OF
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static int led_gpio_of_probe(struct device_d *dev)
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{
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struct device_node *child;
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struct gpio_led *leds;
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int num_leds;
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int ret = 0, n = 0;
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num_leds = of_get_child_count(dev->device_node);
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if (num_leds <= 0)
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return num_leds;
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leds = xzalloc(num_leds * sizeof(struct gpio_led));
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for_each_child_of_node(dev->device_node, child) {
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struct gpio_led *gled = &leds[n];
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const char *default_state;
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enum of_gpio_flags flags;
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int gpio;
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const char *label;
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gpio = of_get_named_gpio_flags(child, "gpios", 0, &flags);
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if (gpio < 0) {
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if (gpio != -EPROBE_DEFER)
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dev_err(dev, "failed to get gpio for %s: %d\n",
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child->full_name, gpio);
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ret = gpio;
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goto err;
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}
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if (of_property_read_string(child, "label", &label))
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label = child->name;
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gled->led.name = xstrdup(label);
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gled->gpio = gpio;
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gled->active_low = (flags & OF_GPIO_ACTIVE_LOW) ? 1 : 0;
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dev_dbg(dev, "register led %s on gpio%d, active_low = %d\n",
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gled->led.name, gled->gpio, gled->active_low);
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led_gpio_register(gled);
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led_of_parse_trigger(&gled->led, child);
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if (!of_property_read_string(child, "default-state", &default_state)) {
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if (!strcmp(default_state, "on"))
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led_gpio_set(&gled->led, 1);
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else if (!strcmp(default_state, "off"))
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led_gpio_set(&gled->led, 0);
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}
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n++;
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}
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return 0;
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err:
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for (n = n - 1; n >= 0; n--)
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led_gpio_unregister(&leds[n]);
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free(leds);
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return ret;
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}
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static struct of_device_id led_gpio_of_ids[] = {
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{ .compatible = "gpio-leds", },
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{ }
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};
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static struct driver_d led_gpio_of_driver = {
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.name = "gpio-leds",
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.probe = led_gpio_of_probe,
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.of_compatible = DRV_OF_COMPAT(led_gpio_of_ids),
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};
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device_platform_driver(led_gpio_of_driver);
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#endif /* CONFIG LED_GPIO_OF */
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