1 /*
2 * Backlight Driver for HP Jornada 680
3 *
4 * Copyright (c) 2005 Andriy Skulysh
5 *
6 * Based on Sharp's Corgi Backlight Driver
7 *
8 * This file is subject to the terms and conditions of the GNU General Public
9 * License. See the file "COPYING" in the main directory of this archive
10 * for more details.
11 */
12
13 #include <linux/module.h>
14 #include <linux/kernel.h>
15 #include <linux/init.h>
16 #include <linux/platform_device.h>
17 #include <linux/spinlock.h>
18 #include <linux/fb.h>
19 #include <linux/backlight.h>
20
21 #include <cpu/dac.h>
22 #include <mach/hp6xx.h>
23 #include <asm/hd64461.h>
24
25 #define HP680_MAX_INTENSITY 255
26 #define HP680_DEFAULT_INTENSITY 10
27
28 static int hp680bl_suspended;
29 static int current_intensity = 0;
30 static DEFINE_SPINLOCK(bl_lock);
31
32 static void hp680bl_send_intensity(struct backlight_device *bd)
33 {
34 unsigned long flags;
35 u16 v;
36 int intensity = bd->props.brightness;
37
38 if (bd->props.power != FB_BLANK_UNBLANK)
39 intensity = 0;
40 if (bd->props.fb_blank != FB_BLANK_UNBLANK)
41 intensity = 0;
42 if (hp680bl_suspended)
43 intensity = 0;
44
45 spin_lock_irqsave(&bl_lock, flags);
46 if (intensity && current_intensity == 0) {
47 sh_dac_enable(DAC_LCD_BRIGHTNESS);
48 v = inw(HD64461_GPBDR);
49 v &= ~HD64461_GPBDR_LCDOFF;
50 outw(v, HD64461_GPBDR);
51 sh_dac_output(255-(u8)intensity, DAC_LCD_BRIGHTNESS);
52 } else if (intensity == 0 && current_intensity != 0) {
53 sh_dac_output(255-(u8)intensity, DAC_LCD_BRIGHTNESS);
54 sh_dac_disable(DAC_LCD_BRIGHTNESS);
55 v = inw(HD64461_GPBDR);
56 v |= HD64461_GPBDR_LCDOFF;
57 outw(v, HD64461_GPBDR);
58 } else if (intensity) {
59 sh_dac_output(255-(u8)intensity, DAC_LCD_BRIGHTNESS);
60 }
61 spin_unlock_irqrestore(&bl_lock, flags);
62
63 current_intensity = intensity;
64 }
65
66
67 #ifdef CONFIG_PM
68 static int hp680bl_suspend(struct platform_device *pdev, pm_message_t state)
69 {
70 struct backlight_device *bd = platform_get_drvdata(pdev);
71
72 hp680bl_suspended = 1;
73 hp680bl_send_intensity(bd);
74 return 0;
75 }
76
77 static int hp680bl_resume(struct platform_device *pdev)
78 {
79 struct backlight_device *bd = platform_get_drvdata(pdev);
80
81 hp680bl_suspended = 0;
82 hp680bl_send_intensity(bd);
83 return 0;
84 }
85 #else
86 #define hp680bl_suspend NULL
87 #define hp680bl_resume NULL
88 #endif
89
90 static int hp680bl_set_intensity(struct backlight_device *bd)
91 {
92 hp680bl_send_intensity(bd);
93 return 0;
94 }
95
96 static int hp680bl_get_intensity(struct backlight_device *bd)
97 {
98 return current_intensity;
99 }
100
101 static struct backlight_ops hp680bl_ops = {
102 .get_brightness = hp680bl_get_intensity,
103 .update_status = hp680bl_set_intensity,
104 };
105
106 static int __init hp680bl_probe(struct platform_device *pdev)
107 {
108 struct backlight_device *bd;
109
110 bd = backlight_device_register ("hp680-bl", &pdev->dev, NULL,
111 &hp680bl_ops);
112 if (IS_ERR(bd))
113 return PTR_ERR(bd);
114
115 platform_set_drvdata(pdev, bd);
116
117 bd->props.max_brightness = HP680_MAX_INTENSITY;
118 bd->props.brightness = HP680_DEFAULT_INTENSITY;
119 hp680bl_send_intensity(bd);
120
121 return 0;
122 }
123
124 static int hp680bl_remove(struct platform_device *pdev)
125 {
126 struct backlight_device *bd = platform_get_drvdata(pdev);
127
128 bd->props.brightness = 0;
129 bd->props.power = 0;
130 hp680bl_send_intensity(bd);
131
132 backlight_device_unregister(bd);
133
134 return 0;
135 }
136
137 static struct platform_driver hp680bl_driver = {
138 .probe = hp680bl_probe,
139 .remove = hp680bl_remove,
140 .suspend = hp680bl_suspend,
141 .resume = hp680bl_resume,
142 .driver = {
143 .name = "hp680-bl",
144 },
145 };
146
147 static struct platform_device *hp680bl_device;
148
149 static int __init hp680bl_init(void)
150 {
151 int ret;
152
153 ret = platform_driver_register(&hp680bl_driver);
154 if (ret)
155 return ret;
156 hp680bl_device = platform_device_register_simple("hp680-bl", -1,
157 NULL, 0);
158 if (IS_ERR(hp680bl_device)) {
159 platform_driver_unregister(&hp680bl_driver);
160 return PTR_ERR(hp680bl_device);
161 }
162 return 0;
163 }
164
165 static void __exit hp680bl_exit(void)
166 {
167 platform_device_unregister(hp680bl_device);
168 platform_driver_unregister(&hp680bl_driver);
169 }
170
171 module_init(hp680bl_init);
172 module_exit(hp680bl_exit);
173
174 MODULE_AUTHOR("Andriy Skulysh <askulysh@gmail.com>");
175 MODULE_DESCRIPTION("HP Jornada 680 Backlight Driver");
176 MODULE_LICENSE("GPL");
177
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