diff options
Diffstat (limited to 'drivers/platform/x86/samsung-q10.c')
-rw-r--r-- | drivers/platform/x86/samsung-q10.c | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/drivers/platform/x86/samsung-q10.c b/drivers/platform/x86/samsung-q10.c new file mode 100644 index 00000000000..1e54ae74274 --- /dev/null +++ b/drivers/platform/x86/samsung-q10.c | |||
@@ -0,0 +1,196 @@ | |||
1 | /* | ||
2 | * Driver for Samsung Q10 and related laptops: controls the backlight | ||
3 | * | ||
4 | * Copyright (c) 2011 Frederick van der Wyck <fvanderwyck@gmail.com> | ||
5 | * | ||
6 | * This program is free software; you can redistribute it and/or modify | ||
7 | * it under the terms of the GNU General Public License version 2 as | ||
8 | * published by the Free Software Foundation. | ||
9 | * | ||
10 | */ | ||
11 | |||
12 | #include <linux/module.h> | ||
13 | #include <linux/kernel.h> | ||
14 | #include <linux/init.h> | ||
15 | #include <linux/platform_device.h> | ||
16 | #include <linux/backlight.h> | ||
17 | #include <linux/i8042.h> | ||
18 | #include <linux/dmi.h> | ||
19 | |||
20 | #define SAMSUNGQ10_BL_MAX_INTENSITY 255 | ||
21 | #define SAMSUNGQ10_BL_DEFAULT_INTENSITY 185 | ||
22 | |||
23 | #define SAMSUNGQ10_BL_8042_CMD 0xbe | ||
24 | #define SAMSUNGQ10_BL_8042_DATA { 0x89, 0x91 } | ||
25 | |||
26 | static int samsungq10_bl_brightness; | ||
27 | |||
28 | static bool force; | ||
29 | module_param(force, bool, 0); | ||
30 | MODULE_PARM_DESC(force, | ||
31 | "Disable the DMI check and force the driver to be loaded"); | ||
32 | |||
33 | static int samsungq10_bl_set_intensity(struct backlight_device *bd) | ||
34 | { | ||
35 | |||
36 | int brightness = bd->props.brightness; | ||
37 | unsigned char c[3] = SAMSUNGQ10_BL_8042_DATA; | ||
38 | |||
39 | c[2] = (unsigned char)brightness; | ||
40 | i8042_lock_chip(); | ||
41 | i8042_command(c, (0x30 << 8) | SAMSUNGQ10_BL_8042_CMD); | ||
42 | i8042_unlock_chip(); | ||
43 | samsungq10_bl_brightness = brightness; | ||
44 | |||
45 | return 0; | ||
46 | } | ||
47 | |||
48 | static int samsungq10_bl_get_intensity(struct backlight_device *bd) | ||
49 | { | ||
50 | return samsungq10_bl_brightness; | ||
51 | } | ||
52 | |||
53 | static const struct backlight_ops samsungq10_bl_ops = { | ||
54 | .get_brightness = samsungq10_bl_get_intensity, | ||
55 | .update_status = samsungq10_bl_set_intensity, | ||
56 | }; | ||
57 | |||
58 | #ifdef CONFIG_PM_SLEEP | ||
59 | static int samsungq10_suspend(struct device *dev) | ||
60 | { | ||
61 | return 0; | ||
62 | } | ||
63 | |||
64 | static int samsungq10_resume(struct device *dev) | ||
65 | { | ||
66 | |||
67 | struct backlight_device *bd = dev_get_drvdata(dev); | ||
68 | |||
69 | samsungq10_bl_set_intensity(bd); | ||
70 | return 0; | ||
71 | } | ||
72 | #else | ||
73 | #define samsungq10_suspend NULL | ||
74 | #define samsungq10_resume NULL | ||
75 | #endif | ||
76 | |||
77 | static SIMPLE_DEV_PM_OPS(samsungq10_pm_ops, | ||
78 | samsungq10_suspend, samsungq10_resume); | ||
79 | |||
80 | static int __devinit samsungq10_probe(struct platform_device *pdev) | ||
81 | { | ||
82 | |||
83 | struct backlight_properties props; | ||
84 | struct backlight_device *bd; | ||
85 | |||
86 | memset(&props, 0, sizeof(struct backlight_properties)); | ||
87 | props.type = BACKLIGHT_PLATFORM; | ||
88 | props.max_brightness = SAMSUNGQ10_BL_MAX_INTENSITY; | ||
89 | bd = backlight_device_register("samsung", &pdev->dev, NULL, | ||
90 | &samsungq10_bl_ops, &props); | ||
91 | if (IS_ERR(bd)) | ||
92 | return PTR_ERR(bd); | ||
93 | |||
94 | platform_set_drvdata(pdev, bd); | ||
95 | |||
96 | bd->props.brightness = SAMSUNGQ10_BL_DEFAULT_INTENSITY; | ||
97 | samsungq10_bl_set_intensity(bd); | ||
98 | |||
99 | return 0; | ||
100 | } | ||
101 | |||
102 | static int __devexit samsungq10_remove(struct platform_device *pdev) | ||
103 | { | ||
104 | |||
105 | struct backlight_device *bd = platform_get_drvdata(pdev); | ||
106 | |||
107 | bd->props.brightness = SAMSUNGQ10_BL_DEFAULT_INTENSITY; | ||
108 | samsungq10_bl_set_intensity(bd); | ||
109 | |||
110 | backlight_device_unregister(bd); | ||
111 | |||
112 | return 0; | ||
113 | } | ||
114 | |||
115 | static struct platform_driver samsungq10_driver = { | ||
116 | .driver = { | ||
117 | .name = KBUILD_MODNAME, | ||
118 | .owner = THIS_MODULE, | ||
119 | .pm = &samsungq10_pm_ops, | ||
120 | }, | ||
121 | .probe = samsungq10_probe, | ||
122 | .remove = __devexit_p(samsungq10_remove), | ||
123 | }; | ||
124 | |||
125 | static struct platform_device *samsungq10_device; | ||
126 | |||
127 | static int __init dmi_check_callback(const struct dmi_system_id *id) | ||
128 | { | ||
129 | printk(KERN_INFO KBUILD_MODNAME ": found model '%s'\n", id->ident); | ||
130 | return 1; | ||
131 | } | ||
132 | |||
133 | static struct dmi_system_id __initdata samsungq10_dmi_table[] = { | ||
134 | { | ||
135 | .ident = "Samsung Q10", | ||
136 | .matches = { | ||
137 | DMI_MATCH(DMI_SYS_VENDOR, "Samsung"), | ||
138 | DMI_MATCH(DMI_PRODUCT_NAME, "SQ10"), | ||
139 | }, | ||
140 | .callback = dmi_check_callback, | ||
141 | }, | ||
142 | { | ||
143 | .ident = "Samsung Q20", | ||
144 | .matches = { | ||
145 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG Electronics"), | ||
146 | DMI_MATCH(DMI_PRODUCT_NAME, "SENS Q20"), | ||
147 | }, | ||
148 | .callback = dmi_check_callback, | ||
149 | }, | ||
150 | { | ||
151 | .ident = "Samsung Q25", | ||
152 | .matches = { | ||
153 | DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG Electronics"), | ||
154 | DMI_MATCH(DMI_PRODUCT_NAME, "NQ25"), | ||
155 | }, | ||
156 | .callback = dmi_check_callback, | ||
157 | }, | ||
158 | { | ||
159 | .ident = "Dell Latitude X200", | ||
160 | .matches = { | ||
161 | DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"), | ||
162 | DMI_MATCH(DMI_PRODUCT_NAME, "X200"), | ||
163 | }, | ||
164 | .callback = dmi_check_callback, | ||
165 | }, | ||
166 | { }, | ||
167 | }; | ||
168 | MODULE_DEVICE_TABLE(dmi, samsungq10_dmi_table); | ||
169 | |||
170 | static int __init samsungq10_init(void) | ||
171 | { | ||
172 | if (!force && !dmi_check_system(samsungq10_dmi_table)) | ||
173 | return -ENODEV; | ||
174 | |||
175 | samsungq10_device = platform_create_bundle(&samsungq10_driver, | ||
176 | samsungq10_probe, | ||
177 | NULL, 0, NULL, 0); | ||
178 | |||
179 | if (IS_ERR(samsungq10_device)) | ||
180 | return PTR_ERR(samsungq10_device); | ||
181 | |||
182 | return 0; | ||
183 | } | ||
184 | |||
185 | static void __exit samsungq10_exit(void) | ||
186 | { | ||
187 | platform_device_unregister(samsungq10_device); | ||
188 | platform_driver_unregister(&samsungq10_driver); | ||
189 | } | ||
190 | |||
191 | module_init(samsungq10_init); | ||
192 | module_exit(samsungq10_exit); | ||
193 | |||
194 | MODULE_AUTHOR("Frederick van der Wyck <fvanderwyck@gmail.com>"); | ||
195 | MODULE_DESCRIPTION("Samsung Q10 Driver"); | ||
196 | MODULE_LICENSE("GPL"); | ||