2 * System Specific setup for PCEngines ALIX.
3 * At the moment this means setup of GPIO control of LEDs
4 * on Alix.2/3/6 boards.
7 * Copyright (C) 2008 Constantin Baranov <const@mimas.ru>
8 * Copyright (C) 2011 Ed Wildgoose <kernel@wildgooses.com>
10 * TODO: There are large similarities with leds-net5501.c
11 * by Alessandro Zummo <a.zummo@towertech.it>
12 * In the future leds-net5501.c should be migrated over to platform
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License version 2
16 * as published by the Free Software Foundation.
19 #include <linux/kernel.h>
20 #include <linux/init.h>
22 #include <linux/string.h>
23 #include <linux/module.h>
24 #include <linux/leds.h>
25 #include <linux/platform_device.h>
26 #include <linux/gpio.h>
28 #include <asm/geode.h>
31 module_param(force
, bool, 0444);
32 /* FIXME: Award bios is not automatically detected as Alix platform */
33 MODULE_PARM_DESC(force
, "Force detection as ALIX.2/ALIX.3 platform");
35 static struct gpio_led alix_leds
[] = {
39 .default_trigger
= "default-on",
45 .default_trigger
= "default-off",
51 .default_trigger
= "default-off",
56 static struct gpio_led_platform_data alix_leds_data
= {
57 .num_leds
= ARRAY_SIZE(alix_leds
),
61 static struct platform_device alix_leds_dev
= {
64 .dev
.platform_data
= &alix_leds_data
,
67 static void __init
register_alix(void)
69 /* Setup LED control through leds-gpio driver */
70 platform_device_register(&alix_leds_dev
);
73 static int __init
alix_present(unsigned long bios_phys
,
77 const size_t bios_len
= 0x00010000;
78 const char *bios_virt
;
84 printk(KERN_NOTICE
"%s: forced to skip BIOS test, "
85 "assume system is ALIX.2/ALIX.3\n",
90 bios_virt
= phys_to_virt(bios_phys
);
91 scan_end
= bios_virt
+ bios_len
- (alix_sig_len
+ 2);
92 for (p
= bios_virt
; p
< scan_end
; p
++) {
96 if (memcmp(p
, alix_sig
, alix_sig_len
) != 0)
99 memcpy(name
, p
, sizeof(name
));
101 /* remove the first \0 character from string */
102 a
= strchr(name
, '\0');
106 /* cut the string at a newline */
107 a
= strchr(name
, '\r');
111 tail
= p
+ alix_sig_len
;
112 if ((tail
[0] == '2' || tail
[0] == '3')) {
114 "%s: system is recognized as \"%s\"\n",
115 KBUILD_MODNAME
, name
);
123 static int __init
alix_init(void)
125 const char tinybios_sig
[] = "PC Engines ALIX.";
126 const char coreboot_sig
[] = "PC Engines\0ALIX.";
131 if (alix_present(0xf0000, tinybios_sig
, sizeof(tinybios_sig
) - 1) ||
132 alix_present(0x500, coreboot_sig
, sizeof(coreboot_sig
) - 1))
138 module_init(alix_init
);
140 MODULE_AUTHOR("Ed Wildgoose <kernel@wildgooses.com>");
141 MODULE_DESCRIPTION("PCEngines ALIX System Setup");
142 MODULE_LICENSE("GPL");