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d03ebb12 CN |
1 | /* |
2 | * Backlight Driver for the KB3886 Backlight | |
3 | * | |
4 | * Copyright (c) 2007-2008 Claudio Nieder | |
5 | * | |
6 | * Based on corgi_bl.c by Richard Purdie and kb3886 driver by Robert Woerle | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | * | |
12 | */ | |
13 | ||
14 | #include <linux/module.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/init.h> | |
17 | #include <linux/platform_device.h> | |
18 | #include <linux/mutex.h> | |
19 | #include <linux/fb.h> | |
20 | #include <linux/backlight.h> | |
21 | #include <linux/delay.h> | |
22 | #include <linux/dmi.h> | |
23 | ||
24 | #define KB3886_PARENT 0x64 | |
25 | #define KB3886_IO 0x60 | |
26 | #define KB3886_ADC_DAC_PWM 0xC4 | |
27 | #define KB3886_PWM0_WRITE 0x81 | |
28 | #define KB3886_PWM0_READ 0x41 | |
29 | ||
30 | static DEFINE_MUTEX(bl_mutex); | |
31 | ||
32 | static void kb3886_bl_set_intensity(int intensity) | |
33 | { | |
34 | mutex_lock(&bl_mutex); | |
35 | intensity = intensity&0xff; | |
36 | outb(KB3886_ADC_DAC_PWM, KB3886_PARENT); | |
37 | msleep(10); | |
38 | outb(KB3886_PWM0_WRITE, KB3886_IO); | |
39 | msleep(10); | |
40 | outb(intensity, KB3886_IO); | |
41 | mutex_unlock(&bl_mutex); | |
42 | } | |
43 | ||
44 | struct kb3886bl_machinfo { | |
45 | int max_intensity; | |
46 | int default_intensity; | |
47 | int limit_mask; | |
48 | void (*set_bl_intensity)(int intensity); | |
49 | }; | |
50 | ||
51 | static struct kb3886bl_machinfo kb3886_bl_machinfo = { | |
52 | .max_intensity = 0xff, | |
53 | .default_intensity = 0xa0, | |
54 | .limit_mask = 0x7f, | |
55 | .set_bl_intensity = kb3886_bl_set_intensity, | |
56 | }; | |
57 | ||
58 | static struct platform_device kb3886bl_device = { | |
59 | .name = "kb3886-bl", | |
60 | .dev = { | |
61 | .platform_data = &kb3886_bl_machinfo, | |
62 | }, | |
63 | .id = -1, | |
64 | }; | |
65 | ||
66 | static struct platform_device *devices[] __initdata = { | |
67 | &kb3886bl_device, | |
68 | }; | |
69 | ||
70 | /* | |
71 | * Back to driver | |
72 | */ | |
73 | ||
74 | static int kb3886bl_intensity; | |
75 | static struct backlight_device *kb3886_backlight_device; | |
76 | static struct kb3886bl_machinfo *bl_machinfo; | |
77 | ||
78 | static unsigned long kb3886bl_flags; | |
79 | #define KB3886BL_SUSPENDED 0x01 | |
80 | ||
81 | static struct dmi_system_id __initdata kb3886bl_device_table[] = { | |
82 | { | |
83 | .ident = "Sahara Touch-iT", | |
84 | .matches = { | |
85 | DMI_MATCH(DMI_SYS_VENDOR, "SDV"), | |
86 | DMI_MATCH(DMI_PRODUCT_NAME, "iTouch T201"), | |
87 | }, | |
88 | }, | |
89 | { } | |
90 | }; | |
91 | ||
92 | static int kb3886bl_send_intensity(struct backlight_device *bd) | |
93 | { | |
94 | int intensity = bd->props.brightness; | |
95 | ||
96 | if (bd->props.power != FB_BLANK_UNBLANK) | |
97 | intensity = 0; | |
98 | if (bd->props.fb_blank != FB_BLANK_UNBLANK) | |
99 | intensity = 0; | |
100 | if (kb3886bl_flags & KB3886BL_SUSPENDED) | |
101 | intensity = 0; | |
102 | ||
103 | bl_machinfo->set_bl_intensity(intensity); | |
104 | ||
105 | kb3886bl_intensity = intensity; | |
106 | return 0; | |
107 | } | |
108 | ||
109 | #ifdef CONFIG_PM | |
110 | static int kb3886bl_suspend(struct platform_device *pdev, pm_message_t state) | |
111 | { | |
112 | struct backlight_device *bd = platform_get_drvdata(pdev); | |
113 | ||
114 | kb3886bl_flags |= KB3886BL_SUSPENDED; | |
115 | backlight_update_status(bd); | |
116 | return 0; | |
117 | } | |
118 | ||
119 | static int kb3886bl_resume(struct platform_device *pdev) | |
120 | { | |
121 | struct backlight_device *bd = platform_get_drvdata(pdev); | |
122 | ||
123 | kb3886bl_flags &= ~KB3886BL_SUSPENDED; | |
124 | backlight_update_status(bd); | |
125 | return 0; | |
126 | } | |
127 | #else | |
128 | #define kb3886bl_suspend NULL | |
129 | #define kb3886bl_resume NULL | |
130 | #endif | |
131 | ||
132 | static int kb3886bl_get_intensity(struct backlight_device *bd) | |
133 | { | |
134 | return kb3886bl_intensity; | |
135 | } | |
136 | ||
9905a43b | 137 | static const struct backlight_ops kb3886bl_ops = { |
d03ebb12 CN |
138 | .get_brightness = kb3886bl_get_intensity, |
139 | .update_status = kb3886bl_send_intensity, | |
140 | }; | |
141 | ||
142 | static int kb3886bl_probe(struct platform_device *pdev) | |
143 | { | |
a19a6ee6 | 144 | struct backlight_properties props; |
d03ebb12 CN |
145 | struct kb3886bl_machinfo *machinfo = pdev->dev.platform_data; |
146 | ||
147 | bl_machinfo = machinfo; | |
148 | if (!machinfo->limit_mask) | |
149 | machinfo->limit_mask = -1; | |
150 | ||
a19a6ee6 | 151 | memset(&props, 0, sizeof(struct backlight_properties)); |
bb7ca747 | 152 | props.type = BACKLIGHT_RAW; |
a19a6ee6 | 153 | props.max_brightness = machinfo->max_intensity; |
d03ebb12 | 154 | kb3886_backlight_device = backlight_device_register("kb3886-bl", |
a19a6ee6 MG |
155 | &pdev->dev, NULL, |
156 | &kb3886bl_ops, | |
157 | &props); | |
d03ebb12 CN |
158 | if (IS_ERR(kb3886_backlight_device)) |
159 | return PTR_ERR(kb3886_backlight_device); | |
160 | ||
161 | platform_set_drvdata(pdev, kb3886_backlight_device); | |
162 | ||
d03ebb12 CN |
163 | kb3886_backlight_device->props.power = FB_BLANK_UNBLANK; |
164 | kb3886_backlight_device->props.brightness = machinfo->default_intensity; | |
165 | backlight_update_status(kb3886_backlight_device); | |
166 | ||
167 | return 0; | |
168 | } | |
169 | ||
170 | static int kb3886bl_remove(struct platform_device *pdev) | |
171 | { | |
172 | struct backlight_device *bd = platform_get_drvdata(pdev); | |
173 | ||
174 | backlight_device_unregister(bd); | |
175 | ||
176 | return 0; | |
177 | } | |
178 | ||
179 | static struct platform_driver kb3886bl_driver = { | |
180 | .probe = kb3886bl_probe, | |
181 | .remove = kb3886bl_remove, | |
182 | .suspend = kb3886bl_suspend, | |
183 | .resume = kb3886bl_resume, | |
184 | .driver = { | |
185 | .name = "kb3886-bl", | |
186 | }, | |
187 | }; | |
188 | ||
189 | static int __init kb3886_init(void) | |
190 | { | |
191 | if (!dmi_check_system(kb3886bl_device_table)) | |
192 | return -ENODEV; | |
193 | ||
194 | platform_add_devices(devices, ARRAY_SIZE(devices)); | |
195 | return platform_driver_register(&kb3886bl_driver); | |
196 | } | |
197 | ||
198 | static void __exit kb3886_exit(void) | |
199 | { | |
200 | platform_driver_unregister(&kb3886bl_driver); | |
201 | } | |
202 | ||
203 | module_init(kb3886_init); | |
204 | module_exit(kb3886_exit); | |
205 | ||
206 | MODULE_AUTHOR("Claudio Nieder <private@claudio.ch>"); | |
207 | MODULE_DESCRIPTION("Tabletkiosk Sahara Touch-iT Backlight Driver"); | |
208 | MODULE_LICENSE("GPL"); | |
209 | MODULE_ALIAS("dmi:*:svnSDV:pniTouchT201:*"); |