mirror of https://gitee.com/openkylin/linux.git
143 lines
3.2 KiB
C
143 lines
3.2 KiB
C
/*
|
|
* System Specific setup for PCEngines ALIX.
|
|
* At the moment this means setup of GPIO control of LEDs
|
|
* on Alix.2/3/6 boards.
|
|
*
|
|
*
|
|
* Copyright (C) 2008 Constantin Baranov <const@mimas.ru>
|
|
* Copyright (C) 2011 Ed Wildgoose <kernel@wildgooses.com>
|
|
*
|
|
* TODO: There are large similarities with leds-net5501.c
|
|
* by Alessandro Zummo <a.zummo@towertech.it>
|
|
* In the future leds-net5501.c should be migrated over to platform
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2
|
|
* as published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/io.h>
|
|
#include <linux/string.h>
|
|
#include <linux/module.h>
|
|
#include <linux/leds.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/gpio.h>
|
|
|
|
#include <asm/geode.h>
|
|
|
|
static int force = 0;
|
|
module_param(force, bool, 0444);
|
|
/* FIXME: Award bios is not automatically detected as Alix platform */
|
|
MODULE_PARM_DESC(force, "Force detection as ALIX.2/ALIX.3 platform");
|
|
|
|
static struct gpio_led alix_leds[] = {
|
|
{
|
|
.name = "alix:1",
|
|
.gpio = 6,
|
|
.default_trigger = "default-on",
|
|
.active_low = 1,
|
|
},
|
|
{
|
|
.name = "alix:2",
|
|
.gpio = 25,
|
|
.default_trigger = "default-off",
|
|
.active_low = 1,
|
|
},
|
|
{
|
|
.name = "alix:3",
|
|
.gpio = 27,
|
|
.default_trigger = "default-off",
|
|
.active_low = 1,
|
|
},
|
|
};
|
|
|
|
static struct gpio_led_platform_data alix_leds_data = {
|
|
.num_leds = ARRAY_SIZE(alix_leds),
|
|
.leds = alix_leds,
|
|
};
|
|
|
|
static struct platform_device alix_leds_dev = {
|
|
.name = "leds-gpio",
|
|
.id = -1,
|
|
.dev.platform_data = &alix_leds_data,
|
|
};
|
|
|
|
static void __init register_alix(void)
|
|
{
|
|
/* Setup LED control through leds-gpio driver */
|
|
platform_device_register(&alix_leds_dev);
|
|
}
|
|
|
|
static int __init alix_present(unsigned long bios_phys,
|
|
const char *alix_sig,
|
|
size_t alix_sig_len)
|
|
{
|
|
const size_t bios_len = 0x00010000;
|
|
const char *bios_virt;
|
|
const char *scan_end;
|
|
const char *p;
|
|
char name[64];
|
|
|
|
if (force) {
|
|
printk(KERN_NOTICE "%s: forced to skip BIOS test, "
|
|
"assume system is ALIX.2/ALIX.3\n",
|
|
KBUILD_MODNAME);
|
|
return 1;
|
|
}
|
|
|
|
bios_virt = phys_to_virt(bios_phys);
|
|
scan_end = bios_virt + bios_len - (alix_sig_len + 2);
|
|
for (p = bios_virt; p < scan_end; p++) {
|
|
const char *tail;
|
|
char *a;
|
|
|
|
if (memcmp(p, alix_sig, alix_sig_len) != 0)
|
|
continue;
|
|
|
|
memcpy(name, p, sizeof(name));
|
|
|
|
/* remove the first \0 character from string */
|
|
a = strchr(name, '\0');
|
|
if (a)
|
|
*a = ' ';
|
|
|
|
/* cut the string at a newline */
|
|
a = strchr(name, '\r');
|
|
if (a)
|
|
*a = '\0';
|
|
|
|
tail = p + alix_sig_len;
|
|
if ((tail[0] == '2' || tail[0] == '3')) {
|
|
printk(KERN_INFO
|
|
"%s: system is recognized as \"%s\"\n",
|
|
KBUILD_MODNAME, name);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __init alix_init(void)
|
|
{
|
|
const char tinybios_sig[] = "PC Engines ALIX.";
|
|
const char coreboot_sig[] = "PC Engines\0ALIX.";
|
|
|
|
if (!is_geode())
|
|
return 0;
|
|
|
|
if (alix_present(0xf0000, tinybios_sig, sizeof(tinybios_sig) - 1) ||
|
|
alix_present(0x500, coreboot_sig, sizeof(coreboot_sig) - 1))
|
|
register_alix();
|
|
|
|
return 0;
|
|
}
|
|
|
|
module_init(alix_init);
|
|
|
|
MODULE_AUTHOR("Ed Wildgoose <kernel@wildgooses.com>");
|
|
MODULE_DESCRIPTION("PCEngines ALIX System Setup");
|
|
MODULE_LICENSE("GPL");
|