328f5cc302
Convert some ARM architecture's common code to using struct syscore_ops objects for power management instead of sysdev classes and sysdevs. This simplifies the code and reduces the kernel's memory footprint. It also is necessary for removing sysdevs from the kernel entirely in the future. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
120 lines
2.4 KiB
C
120 lines
2.4 KiB
C
/*
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* LED support code, ripped out of arch/arm/kernel/time.c
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*
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* Copyright (C) 1994-2001 Russell King
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/sysdev.h>
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#include <linux/syscore_ops.h>
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#include <asm/leds.h>
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static void dummy_leds_event(led_event_t evt)
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{
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}
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void (*leds_event)(led_event_t) = dummy_leds_event;
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struct leds_evt_name {
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const char name[8];
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int on;
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int off;
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};
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static const struct leds_evt_name evt_names[] = {
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{ "amber", led_amber_on, led_amber_off },
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{ "blue", led_blue_on, led_blue_off },
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{ "green", led_green_on, led_green_off },
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{ "red", led_red_on, led_red_off },
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};
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static ssize_t leds_store(struct sys_device *dev,
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struct sysdev_attribute *attr,
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const char *buf, size_t size)
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{
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int ret = -EINVAL, len = strcspn(buf, " ");
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if (len > 0 && buf[len] == '\0')
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len--;
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if (strncmp(buf, "claim", len) == 0) {
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leds_event(led_claim);
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ret = size;
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} else if (strncmp(buf, "release", len) == 0) {
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leds_event(led_release);
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ret = size;
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} else {
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int i;
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for (i = 0; i < ARRAY_SIZE(evt_names); i++) {
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if (strlen(evt_names[i].name) != len ||
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strncmp(buf, evt_names[i].name, len) != 0)
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continue;
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if (strncmp(buf+len, " on", 3) == 0) {
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leds_event(evt_names[i].on);
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ret = size;
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} else if (strncmp(buf+len, " off", 4) == 0) {
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leds_event(evt_names[i].off);
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ret = size;
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}
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break;
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}
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}
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return ret;
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}
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static SYSDEV_ATTR(event, 0200, NULL, leds_store);
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static struct sysdev_class leds_sysclass = {
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.name = "leds",
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};
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static struct sys_device leds_device = {
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.id = 0,
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.cls = &leds_sysclass,
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};
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static int leds_suspend(void)
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{
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leds_event(led_stop);
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return 0;
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}
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static void leds_resume(void)
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{
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leds_event(led_start);
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}
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static void leds_shutdown(void)
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{
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leds_event(led_halted);
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}
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static struct syscore_ops leds_syscore_ops = {
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.shutdown = leds_shutdown,
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.suspend = leds_suspend,
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.resume = leds_resume,
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};
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static int __init leds_init(void)
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{
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int ret;
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ret = sysdev_class_register(&leds_sysclass);
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if (ret == 0)
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ret = sysdev_register(&leds_device);
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if (ret == 0)
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ret = sysdev_create_file(&leds_device, &attr_event);
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if (ret == 0)
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register_syscore_ops(&leds_syscore_ops);
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return ret;
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}
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device_initcall(leds_init);
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EXPORT_SYMBOL(leds_event);
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