1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20#include <linux/kernel.h>
21#include <linux/init.h>
22#include <linux/io.h>
23#include <linux/string.h>
24#include <linux/moduleparam.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>
31
32#include <asm/geode.h>
33
34#define BIOS_SIGNATURE_TINYBIOS 0xf0000
35#define BIOS_SIGNATURE_COREBOOT 0x500
36#define BIOS_REGION_SIZE 0x10000
37
38
39
40
41
42
43static bool force = 0;
44module_param(force, bool, 0444);
45
46MODULE_PARM_DESC(force, "Force detection as ALIX.2/ALIX.3 platform");
47
48static struct gpio_keys_button alix_gpio_buttons[] = {
49 {
50 .code = KEY_RESTART,
51 .gpio = 24,
52 .active_low = 1,
53 .desc = "Reset button",
54 .type = EV_KEY,
55 .wakeup = 0,
56 .debounce_interval = 100,
57 .can_disable = 0,
58 }
59};
60static struct gpio_keys_platform_data alix_buttons_data = {
61 .buttons = alix_gpio_buttons,
62 .nbuttons = ARRAY_SIZE(alix_gpio_buttons),
63 .poll_interval = 20,
64};
65
66static struct platform_device alix_buttons_dev = {
67 .name = "gpio-keys-polled",
68 .id = 1,
69 .dev = {
70 .platform_data = &alix_buttons_data,
71 }
72};
73
74static struct gpio_led alix_leds[] = {
75 {
76 .name = "alix:1",
77 .gpio = 6,
78 .default_trigger = "default-on",
79 .active_low = 1,
80 },
81 {
82 .name = "alix:2",
83 .gpio = 25,
84 .default_trigger = "default-off",
85 .active_low = 1,
86 },
87 {
88 .name = "alix:3",
89 .gpio = 27,
90 .default_trigger = "default-off",
91 .active_low = 1,
92 },
93};
94
95static struct gpio_led_platform_data alix_leds_data = {
96 .num_leds = ARRAY_SIZE(alix_leds),
97 .leds = alix_leds,
98};
99
100static struct platform_device alix_leds_dev = {
101 .name = "leds-gpio",
102 .id = -1,
103 .dev.platform_data = &alix_leds_data,
104};
105
106static struct platform_device *alix_devs[] __initdata = {
107 &alix_buttons_dev,
108 &alix_leds_dev,
109};
110
111static void __init register_alix(void)
112{
113
114 platform_add_devices(alix_devs, ARRAY_SIZE(alix_devs));
115}
116
117static bool __init alix_present(unsigned long bios_phys,
118 const char *alix_sig,
119 size_t alix_sig_len)
120{
121 const size_t bios_len = BIOS_REGION_SIZE;
122 const char *bios_virt;
123 const char *scan_end;
124 const char *p;
125 char name[64];
126
127 if (force) {
128 printk(KERN_NOTICE "%s: forced to skip BIOS test, "
129 "assume system is ALIX.2/ALIX.3\n",
130 KBUILD_MODNAME);
131 return true;
132 }
133
134 bios_virt = phys_to_virt(bios_phys);
135 scan_end = bios_virt + bios_len - (alix_sig_len + 2);
136 for (p = bios_virt; p < scan_end; p++) {
137 const char *tail;
138 char *a;
139
140 if (memcmp(p, alix_sig, alix_sig_len) != 0)
141 continue;
142
143 memcpy(name, p, sizeof(name));
144
145
146 a = strchr(name, '\0');
147 if (a)
148 *a = ' ';
149
150
151 a = strchr(name, '\r');
152 if (a)
153 *a = '\0';
154
155 tail = p + alix_sig_len;
156 if ((tail[0] == '2' || tail[0] == '3' || tail[0] == '6')) {
157 printk(KERN_INFO
158 "%s: system is recognized as \"%s\"\n",
159 KBUILD_MODNAME, name);
160 return true;
161 }
162 }
163
164 return false;
165}
166
167static bool __init alix_present_dmi(void)
168{
169 const char *vendor, *product;
170
171 vendor = dmi_get_system_info(DMI_SYS_VENDOR);
172 if (!vendor || strcmp(vendor, "PC Engines"))
173 return false;
174
175 product = dmi_get_system_info(DMI_PRODUCT_NAME);
176 if (!product || (strcmp(product, "ALIX.2D") && strcmp(product, "ALIX.6")))
177 return false;
178
179 printk(KERN_INFO "%s: system is recognized as \"%s %s\"\n",
180 KBUILD_MODNAME, vendor, product);
181
182 return true;
183}
184
185static int __init alix_init(void)
186{
187 const char tinybios_sig[] = "PC Engines ALIX.";
188 const char coreboot_sig[] = "PC Engines\0ALIX.";
189
190 if (!is_geode())
191 return 0;
192
193 if (alix_present(BIOS_SIGNATURE_TINYBIOS, tinybios_sig, sizeof(tinybios_sig) - 1) ||
194 alix_present(BIOS_SIGNATURE_COREBOOT, coreboot_sig, sizeof(coreboot_sig) - 1) ||
195 alix_present_dmi())
196 register_alix();
197
198 return 0;
199}
200device_initcall(alix_init);
201
