156 lines
3.3 KiB
C
156 lines
3.3 KiB
C
/*
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* core 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 <command.h>
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#include <linux/list.h>
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#include <errno.h>
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#include <led.h>
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#include <poller.h>
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#include <clock.h>
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#include <linux/ctype.h>
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/**
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* @file
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* @brief LED framework
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*
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* This file contains the core LED framework for barebox.
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*
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* Each LED can be set to a value where 0 means disabled and values
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* > 0 mean enabled. LEDs can have different enable values where the
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* exact meaning depends on the LED, for example a gpio controlled rgb
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* LED can have enable values from 1 to 7 which correspond to different
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* colors. value could also mean a brightness.
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* Each LED is assigned a number. numbers start with 0 and are increased
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* with each registered LED. The number stays the same during lifecycle,
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* gaps because of unregistered LEDs are not filled up.
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*/
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static LIST_HEAD(leds);
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static int num_leds;
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/**
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* led_by_number - get the number of a LED
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* @param num number of the LED to return
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*/
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struct led *led_by_number(int num)
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{
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struct led *led;
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list_for_each_entry(led, &leds, list) {
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if (led->num == num)
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return led;
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}
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return NULL;
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}
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/**
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* led_by_name - get a LED with its name
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* @param name name of the LED
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*/
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struct led *led_by_name(const char *name)
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{
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struct led *led;
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list_for_each_entry(led, &leds, list) {
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if (led->name && !strcmp(led->name, name))
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return led;
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}
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return NULL;
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}
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/**
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* led_by_name_or_number - get a LED with its name or number
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* @param str if first character of str is a digit led_by_number
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* is returned, led_by_name otherwise.
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*/
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struct led *led_by_name_or_number(const char *str)
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{
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if (isdigit(*str)) {
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int l;
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l = simple_strtoul(str, NULL, 0);
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return led_by_number(l);
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} else {
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return led_by_name(str);
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}
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}
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/**
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* led_set - set the value of a LED
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* @param led the led
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* @param value the value of the LED (0 is disabled)
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*/
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int led_set(struct led *led, unsigned int value)
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{
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if (value > led->max_value)
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value = led->max_value;
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if (!led->set)
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return -ENODEV;
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led->set(led, value);
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return 0;
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}
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/**
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* led_set_num - set the value of a LED
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* @param num the number of the LED
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* @param value the value of the LED (0 is disabled)
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*/
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int led_set_num(int num, unsigned int value)
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{
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struct led *led = led_by_number(num);
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if (!led)
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return -ENODEV;
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return led_set(led, value);
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}
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/**
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* led_register - Register a LED
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* @param led the led
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*/
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int led_register(struct led *led)
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{
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if (led->name && led_by_name(led->name))
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return -EBUSY;
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led->num = num_leds++;
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list_add_tail(&led->list, &leds);
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return 0;
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}
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/**
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* led_unregister - Unegister a LED
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* @param led the led
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*/
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void led_unregister(struct led *led)
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{
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list_del(&led->list);
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}
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