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
137 static struct backlight_ops kb3886bl_ops = {
138 .get_brightness = kb3886bl_get_intensity,
139 .update_status = kb3886bl_send_intensity,
140 };
141
142 static int kb3886bl_probe(struct platform_device *pdev)
143 {
144 struct kb3886bl_machinfo *machinfo = pdev->dev.platform_data;
145
146 bl_machinfo = machinfo;
147 if (!machinfo->limit_mask)
148 machinfo->limit_mask = -1;
149
150 kb3886_backlight_device = backlight_device_register("kb3886-bl",
151 &pdev->dev, NULL, &kb3886bl_ops);
152 if (IS_ERR(kb3886_backlight_device))
153 return PTR_ERR(kb3886_backlight_device);
154
155 platform_set_drvdata(pdev, kb3886_backlight_device);
156
157 kb3886_backlight_device->props.max_brightness = machinfo->max_intensity;
158 kb3886_backlight_device->props.power = FB_BLANK_UNBLANK;
159 kb3886_backlight_device->props.brightness = machinfo->default_intensity;
160 backlight_update_status(kb3886_backlight_device);
161
162 return 0;
163 }
164
165 static int kb3886bl_remove(struct platform_device *pdev)
166 {
167 struct backlight_device *bd = platform_get_drvdata(pdev);
168
169 backlight_device_unregister(bd);
170
171 return 0;
172 }
173
174 static struct platform_driver kb3886bl_driver = {
175 .probe = kb3886bl_probe,
176 .remove = kb3886bl_remove,
177 .suspend = kb3886bl_suspend,
178 .resume = kb3886bl_resume,
179 .driver = {
180 .name = "kb3886-bl",
181 },
182 };
183
184 static int __init kb3886_init(void)
185 {
186 if (!dmi_check_system(kb3886bl_device_table))
187 return -ENODEV;
188
189 platform_add_devices(devices, ARRAY_SIZE(devices));
190 return platform_driver_register(&kb3886bl_driver);
191 }
192
193 static void __exit kb3886_exit(void)
194 {
195 platform_driver_unregister(&kb3886bl_driver);
196 }
197
198 module_init(kb3886_init);
199 module_exit(kb3886_exit);
200
201 MODULE_AUTHOR("Claudio Nieder <private@claudio.ch>");
202 MODULE_DESCRIPTION("Tabletkiosk Sahara Touch-iT Backlight Driver");
203 MODULE_LICENSE("GPL");
204 MODULE_ALIAS("dmi:*:svnSDV:pniTouchT201:*");
205
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