]>
Commit | Line | Data |
---|---|---|
ec9a943c CB |
1 | /* |
2 | * LEDs driver for PCEngines ALIX.2 and ALIX.3 | |
3 | * | |
4 | * Copyright (C) 2008 Constantin Baranov <const@mimas.ru> | |
5 | */ | |
6 | ||
7 | #include <linux/err.h> | |
8 | #include <linux/io.h> | |
9 | #include <linux/kernel.h> | |
10 | #include <linux/leds.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/platform_device.h> | |
13 | #include <linux/string.h> | |
14 | ||
15 | static int force = 0; | |
16 | module_param(force, bool, 0444); | |
17 | MODULE_PARM_DESC(force, "Assume system has ALIX.2 style LEDs"); | |
18 | ||
19 | struct alix_led { | |
20 | struct led_classdev cdev; | |
21 | unsigned short port; | |
22 | unsigned int on_value; | |
23 | unsigned int off_value; | |
24 | }; | |
25 | ||
26 | static void alix_led_set(struct led_classdev *led_cdev, | |
27 | enum led_brightness brightness) | |
28 | { | |
29 | struct alix_led *led_dev = | |
30 | container_of(led_cdev, struct alix_led, cdev); | |
31 | ||
32 | if (brightness) | |
33 | outl(led_dev->on_value, led_dev->port); | |
34 | else | |
35 | outl(led_dev->off_value, led_dev->port); | |
36 | } | |
37 | ||
38 | static struct alix_led alix_leds[] = { | |
39 | { | |
40 | .cdev = { | |
41 | .name = "alix:1", | |
42 | .brightness_set = alix_led_set, | |
43 | }, | |
44 | .port = 0x6100, | |
45 | .on_value = 1 << 22, | |
46 | .off_value = 1 << 6, | |
47 | }, | |
48 | { | |
49 | .cdev = { | |
50 | .name = "alix:2", | |
51 | .brightness_set = alix_led_set, | |
52 | }, | |
53 | .port = 0x6180, | |
54 | .on_value = 1 << 25, | |
55 | .off_value = 1 << 9, | |
56 | }, | |
57 | { | |
58 | .cdev = { | |
59 | .name = "alix:3", | |
60 | .brightness_set = alix_led_set, | |
61 | }, | |
62 | .port = 0x6180, | |
63 | .on_value = 1 << 27, | |
64 | .off_value = 1 << 11, | |
65 | }, | |
66 | }; | |
67 | ||
ec9a943c CB |
68 | static int __init alix_led_probe(struct platform_device *pdev) |
69 | { | |
70 | int i; | |
71 | int ret; | |
72 | ||
73 | for (i = 0; i < ARRAY_SIZE(alix_leds); i++) { | |
859cb7f2 | 74 | alix_leds[i].cdev.flags |= LED_CORE_SUSPENDRESUME; |
ec9a943c CB |
75 | ret = led_classdev_register(&pdev->dev, &alix_leds[i].cdev); |
76 | if (ret < 0) | |
77 | goto fail; | |
78 | } | |
79 | return 0; | |
80 | ||
81 | fail: | |
82 | while (--i >= 0) | |
83 | led_classdev_unregister(&alix_leds[i].cdev); | |
84 | return ret; | |
85 | } | |
86 | ||
87 | static int alix_led_remove(struct platform_device *pdev) | |
88 | { | |
89 | int i; | |
90 | ||
91 | for (i = 0; i < ARRAY_SIZE(alix_leds); i++) | |
92 | led_classdev_unregister(&alix_leds[i].cdev); | |
93 | return 0; | |
94 | } | |
95 | ||
96 | static struct platform_driver alix_led_driver = { | |
97 | .remove = alix_led_remove, | |
ec9a943c CB |
98 | .driver = { |
99 | .name = KBUILD_MODNAME, | |
100 | .owner = THIS_MODULE, | |
101 | }, | |
102 | }; | |
103 | ||
104 | static int __init alix_present(void) | |
105 | { | |
106 | const unsigned long bios_phys = 0x000f0000; | |
107 | const size_t bios_len = 0x00010000; | |
108 | const char alix_sig[] = "PC Engines ALIX."; | |
109 | const size_t alix_sig_len = sizeof(alix_sig) - 1; | |
110 | ||
111 | const char *bios_virt; | |
112 | const char *scan_end; | |
113 | const char *p; | |
114 | int ret = 0; | |
115 | ||
116 | if (force) { | |
117 | printk(KERN_NOTICE "%s: forced to skip BIOS test, " | |
118 | "assume system has ALIX.2 style LEDs\n", | |
119 | KBUILD_MODNAME); | |
120 | ret = 1; | |
121 | goto out; | |
122 | } | |
123 | ||
124 | bios_virt = phys_to_virt(bios_phys); | |
125 | scan_end = bios_virt + bios_len - (alix_sig_len + 2); | |
126 | for (p = bios_virt; p < scan_end; p++) { | |
127 | const char *tail; | |
128 | ||
129 | if (memcmp(p, alix_sig, alix_sig_len) != 0) { | |
130 | continue; | |
131 | } | |
132 | ||
133 | tail = p + alix_sig_len; | |
134 | if ((tail[0] == '2' || tail[0] == '3') && tail[1] == '\0') { | |
135 | printk(KERN_INFO | |
136 | "%s: system is recognized as \"%s\"\n", | |
137 | KBUILD_MODNAME, p); | |
138 | ret = 1; | |
139 | break; | |
140 | } | |
141 | } | |
142 | ||
143 | out: | |
144 | return ret; | |
145 | } | |
146 | ||
147 | static struct platform_device *pdev; | |
148 | ||
149 | static int __init alix_led_init(void) | |
150 | { | |
151 | int ret; | |
152 | ||
153 | if (!alix_present()) { | |
154 | ret = -ENODEV; | |
155 | goto out; | |
156 | } | |
157 | ||
158 | pdev = platform_device_register_simple(KBUILD_MODNAME, -1, NULL, 0); | |
159 | if (!IS_ERR(pdev)) { | |
160 | ret = platform_driver_probe(&alix_led_driver, alix_led_probe); | |
161 | if (ret) | |
162 | platform_device_unregister(pdev); | |
163 | } else | |
164 | ret = PTR_ERR(pdev); | |
165 | ||
166 | out: | |
167 | return ret; | |
168 | } | |
169 | ||
170 | static void __exit alix_led_exit(void) | |
171 | { | |
172 | platform_device_unregister(pdev); | |
173 | platform_driver_unregister(&alix_led_driver); | |
174 | } | |
175 | ||
176 | module_init(alix_led_init); | |
177 | module_exit(alix_led_exit); | |
178 | ||
179 | MODULE_AUTHOR("Constantin Baranov <const@mimas.ru>"); | |
180 | MODULE_DESCRIPTION("PCEngines ALIX.2 and ALIX.3 LED driver"); | |
181 | MODULE_LICENSE("GPL"); |