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>
9 * and Philip Prindeville <philipp@redfish-solutions.com>
11 * TODO: There are large similarities with leds-net5501.c
12 * by Alessandro Zummo <a.zummo@towertech.it>
13 * In the future leds-net5501.c should be migrated over to platform
15 * This program is free software; you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License version 2
17 * as published by the Free Software Foundation.
20 #include <linux/kernel.h>
21 #include <linux/init.h>
23 #include <linux/string.h>
24 #include <linux/module.h>
25 #include <linux/leds.h>
26 #include <linux/platform_device.h>
27 #include <linux/gpio.h>
28 #include <linux/input.h>
29 #include <linux/gpio_keys.h>
30 #include <linux/dmi.h>
32 #include <asm/geode.h>
34 #define BIOS_SIGNATURE_TINYBIOS 0xf0000
35 #define BIOS_SIGNATURE_COREBOOT 0x500
36 #define BIOS_REGION_SIZE 0x10000
38 static bool force = 0;
39 module_param(force, bool, 0444);
40 /* FIXME: Award bios is not automatically detected as Alix platform */
41 MODULE_PARM_DESC(force, "Force detection as ALIX.2/ALIX.3 platform");
43 static struct gpio_keys_button alix_gpio_buttons[] = {
48 .desc = "Reset button",
51 .debounce_interval = 100,
55 static struct gpio_keys_platform_data alix_buttons_data = {
56 .buttons = alix_gpio_buttons,
57 .nbuttons = ARRAY_SIZE(alix_gpio_buttons),
61 static struct platform_device alix_buttons_dev = {
62 .name = "gpio-keys-polled",
65 .platform_data = &alix_buttons_data,
69 static struct gpio_led alix_leds[] = {
73 .default_trigger = "default-on",
79 .default_trigger = "default-off",
85 .default_trigger = "default-off",
90 static struct gpio_led_platform_data alix_leds_data = {
91 .num_leds = ARRAY_SIZE(alix_leds),
95 static struct platform_device alix_leds_dev = {
98 .dev.platform_data = &alix_leds_data,
101 static struct platform_device *alix_devs[] __initdata = {
106 static void __init register_alix(void)
108 /* Setup LED control through leds-gpio driver */
109 platform_add_devices(alix_devs, ARRAY_SIZE(alix_devs));
112 static bool __init alix_present(unsigned long bios_phys,
113 const char *alix_sig,
116 const size_t bios_len = BIOS_REGION_SIZE;
117 const char *bios_virt;
118 const char *scan_end;
123 printk(KERN_NOTICE "%s: forced to skip BIOS test, "
124 "assume system is ALIX.2/ALIX.3\n",
129 bios_virt = phys_to_virt(bios_phys);
130 scan_end = bios_virt + bios_len - (alix_sig_len + 2);
131 for (p = bios_virt; p < scan_end; p++) {
135 if (memcmp(p, alix_sig, alix_sig_len) != 0)
138 memcpy(name, p, sizeof(name));
140 /* remove the first \0 character from string */
141 a = strchr(name, '\0');
145 /* cut the string at a newline */
146 a = strchr(name, '\r');
150 tail = p + alix_sig_len;
151 if ((tail[0] == '2' || tail[0] == '3' || tail[0] == '6')) {
153 "%s: system is recognized as \"%s\"\n",
154 KBUILD_MODNAME, name);
162 static bool __init alix_present_dmi(void)
164 const char *vendor, *product;
166 vendor = dmi_get_system_info(DMI_SYS_VENDOR);
167 if (!vendor || strcmp(vendor, "PC Engines"))
170 product = dmi_get_system_info(DMI_PRODUCT_NAME);
171 if (!product || (strcmp(product, "ALIX.2D") && strcmp(product, "ALIX.6")))
174 printk(KERN_INFO "%s: system is recognized as \"%s %s\"\n",
175 KBUILD_MODNAME, vendor, product);
180 static int __init alix_init(void)
182 const char tinybios_sig[] = "PC Engines ALIX.";
183 const char coreboot_sig[] = "PC Engines\0ALIX.";
188 if (alix_present(BIOS_SIGNATURE_TINYBIOS, tinybios_sig, sizeof(tinybios_sig) - 1) ||
189 alix_present(BIOS_SIGNATURE_COREBOOT, coreboot_sig, sizeof(coreboot_sig) - 1) ||
196 module_init(alix_init);
198 MODULE_AUTHOR("Ed Wildgoose <kernel@wildgooses.com>");
199 MODULE_DESCRIPTION("PCEngines ALIX System Setup");
200 MODULE_LICENSE("GPL");