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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
28static int hp680bl_suspended;
29static int current_intensity;
30static DEFINE_SPINLOCK(bl_lock);
31
32static 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_SLEEP
68static int hp680bl_suspend(struct device *dev)
69{
70 struct backlight_device *bd = dev_get_drvdata(dev);
71
72 hp680bl_suspended = 1;
73 hp680bl_send_intensity(bd);
74 return 0;
75}
76
77static int hp680bl_resume(struct device *dev)
78{
79 struct backlight_device *bd = dev_get_drvdata(dev);
80
81 hp680bl_suspended = 0;
82 hp680bl_send_intensity(bd);
83 return 0;
84}
85#endif
86
87static SIMPLE_DEV_PM_OPS(hp680bl_pm_ops, hp680bl_suspend, hp680bl_resume);
88
89static int hp680bl_set_intensity(struct backlight_device *bd)
90{
91 hp680bl_send_intensity(bd);
92 return 0;
93}
94
95static int hp680bl_get_intensity(struct backlight_device *bd)
96{
97 return current_intensity;
98}
99
100static const struct backlight_ops hp680bl_ops = {
101 .get_brightness = hp680bl_get_intensity,
102 .update_status = hp680bl_set_intensity,
103};
104
105static int hp680bl_probe(struct platform_device *pdev)
106{
107 struct backlight_properties props;
108 struct backlight_device *bd;
109
110 memset(&props, 0, sizeof(struct backlight_properties));
111 props.type = BACKLIGHT_RAW;
112 props.max_brightness = HP680_MAX_INTENSITY;
113 bd = backlight_device_register("hp680-bl", &pdev->dev, NULL,
114 &hp680bl_ops, &props);
115 if (IS_ERR(bd))
116 return PTR_ERR(bd);
117
118 platform_set_drvdata(pdev, bd);
119
120 bd->props.brightness = HP680_DEFAULT_INTENSITY;
121 hp680bl_send_intensity(bd);
122
123 return 0;
124}
125
126static int hp680bl_remove(struct platform_device *pdev)
127{
128 struct backlight_device *bd = platform_get_drvdata(pdev);
129
130 bd->props.brightness = 0;
131 bd->props.power = 0;
132 hp680bl_send_intensity(bd);
133
134 backlight_device_unregister(bd);
135
136 return 0;
137}
138
139static struct platform_driver hp680bl_driver = {
140 .probe = hp680bl_probe,
141 .remove = hp680bl_remove,
142 .driver = {
143 .name = "hp680-bl",
144 .pm = &hp680bl_pm_ops,
145 },
146};
147
148static struct platform_device *hp680bl_device;
149
150static int __init hp680bl_init(void)
151{
152 int ret;
153
154 ret = platform_driver_register(&hp680bl_driver);
155 if (ret)
156 return ret;
157 hp680bl_device = platform_device_register_simple("hp680-bl", -1,
158 NULL, 0);
159 if (IS_ERR(hp680bl_device)) {
160 platform_driver_unregister(&hp680bl_driver);
161 return PTR_ERR(hp680bl_device);
162 }
163 return 0;
164}
165
166static void __exit hp680bl_exit(void)
167{
168 platform_device_unregister(hp680bl_device);
169 platform_driver_unregister(&hp680bl_driver);
170}
171
172module_init(hp680bl_init);
173module_exit(hp680bl_exit);
174
175MODULE_AUTHOR("Andriy Skulysh <askulysh@gmail.com>");
176MODULE_DESCRIPTION("HP Jornada 680 Backlight Driver");
177MODULE_LICENSE("GPL");
178
