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; |
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 = backlight_get_brightness(bd); |
37 | |
38 | if (hp680bl_suspended) |
39 | intensity = 0; |
40 | |
41 | spin_lock_irqsave(&bl_lock, flags); |
42 | if (intensity && current_intensity == 0) { |
43 | sh_dac_enable(DAC_LCD_BRIGHTNESS); |
44 | v = inw(port: HD64461_GPBDR); |
45 | v &= ~HD64461_GPBDR_LCDOFF; |
46 | outw(value: v, port: HD64461_GPBDR); |
47 | sh_dac_output(255-(u8)intensity, DAC_LCD_BRIGHTNESS); |
48 | } else if (intensity == 0 && current_intensity != 0) { |
49 | sh_dac_output(255-(u8)intensity, DAC_LCD_BRIGHTNESS); |
50 | sh_dac_disable(DAC_LCD_BRIGHTNESS); |
51 | v = inw(port: HD64461_GPBDR); |
52 | v |= HD64461_GPBDR_LCDOFF; |
53 | outw(value: v, port: HD64461_GPBDR); |
54 | } else if (intensity) { |
55 | sh_dac_output(255-(u8)intensity, DAC_LCD_BRIGHTNESS); |
56 | } |
57 | spin_unlock_irqrestore(lock: &bl_lock, flags); |
58 | |
59 | current_intensity = intensity; |
60 | } |
61 | |
62 | |
63 | #ifdef CONFIG_PM_SLEEP |
64 | static int hp680bl_suspend(struct device *dev) |
65 | { |
66 | struct backlight_device *bd = dev_get_drvdata(dev); |
67 | |
68 | hp680bl_suspended = 1; |
69 | hp680bl_send_intensity(bd); |
70 | return 0; |
71 | } |
72 | |
73 | static int hp680bl_resume(struct device *dev) |
74 | { |
75 | struct backlight_device *bd = dev_get_drvdata(dev); |
76 | |
77 | hp680bl_suspended = 0; |
78 | hp680bl_send_intensity(bd); |
79 | return 0; |
80 | } |
81 | #endif |
82 | |
83 | static SIMPLE_DEV_PM_OPS(hp680bl_pm_ops, hp680bl_suspend, hp680bl_resume); |
84 | |
85 | static int hp680bl_set_intensity(struct backlight_device *bd) |
86 | { |
87 | hp680bl_send_intensity(bd); |
88 | return 0; |
89 | } |
90 | |
91 | static int hp680bl_get_intensity(struct backlight_device *bd) |
92 | { |
93 | return current_intensity; |
94 | } |
95 | |
96 | static const struct backlight_ops hp680bl_ops = { |
97 | .get_brightness = hp680bl_get_intensity, |
98 | .update_status = hp680bl_set_intensity, |
99 | }; |
100 | |
101 | static int hp680bl_probe(struct platform_device *pdev) |
102 | { |
103 | struct backlight_properties props; |
104 | struct backlight_device *bd; |
105 | |
106 | memset(&props, 0, sizeof(struct backlight_properties)); |
107 | props.type = BACKLIGHT_RAW; |
108 | props.max_brightness = HP680_MAX_INTENSITY; |
109 | bd = devm_backlight_device_register(dev: &pdev->dev, name: "hp680-bl" , parent: &pdev->dev, |
110 | NULL, ops: &hp680bl_ops, props: &props); |
111 | if (IS_ERR(ptr: bd)) |
112 | return PTR_ERR(ptr: bd); |
113 | |
114 | platform_set_drvdata(pdev, data: bd); |
115 | |
116 | bd->props.brightness = HP680_DEFAULT_INTENSITY; |
117 | hp680bl_send_intensity(bd); |
118 | |
119 | return 0; |
120 | } |
121 | |
122 | static void hp680bl_remove(struct platform_device *pdev) |
123 | { |
124 | struct backlight_device *bd = platform_get_drvdata(pdev); |
125 | |
126 | bd->props.brightness = 0; |
127 | bd->props.power = 0; |
128 | hp680bl_send_intensity(bd); |
129 | } |
130 | |
131 | static struct platform_driver hp680bl_driver = { |
132 | .probe = hp680bl_probe, |
133 | .remove_new = hp680bl_remove, |
134 | .driver = { |
135 | .name = "hp680-bl" , |
136 | .pm = &hp680bl_pm_ops, |
137 | }, |
138 | }; |
139 | |
140 | static struct platform_device *hp680bl_device; |
141 | |
142 | static int __init hp680bl_init(void) |
143 | { |
144 | int ret; |
145 | |
146 | ret = platform_driver_register(&hp680bl_driver); |
147 | if (ret) |
148 | return ret; |
149 | hp680bl_device = platform_device_register_simple(name: "hp680-bl" , id: -1, |
150 | NULL, num: 0); |
151 | if (IS_ERR(ptr: hp680bl_device)) { |
152 | platform_driver_unregister(&hp680bl_driver); |
153 | return PTR_ERR(ptr: hp680bl_device); |
154 | } |
155 | return 0; |
156 | } |
157 | |
158 | static void __exit hp680bl_exit(void) |
159 | { |
160 | platform_device_unregister(hp680bl_device); |
161 | platform_driver_unregister(&hp680bl_driver); |
162 | } |
163 | |
164 | module_init(hp680bl_init); |
165 | module_exit(hp680bl_exit); |
166 | |
167 | MODULE_AUTHOR("Andriy Skulysh <askulysh@gmail.com>" ); |
168 | MODULE_DESCRIPTION("HP Jornada 680 Backlight Driver" ); |
169 | MODULE_LICENSE("GPL" ); |
170 | |