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78542e18 FW |
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); | |
046f828b | 130 | return 1; |
78542e18 FW |
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"); |