2 * Backlight Driver for HP Jornada 680
4 * Copyright (c) 2005 Andriy Skulysh
6 * Based on Sharp's Corgi Backlight Driver
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
13 #include <linux/module.h>
14 #include <linux/kernel.h>
15 #include <linux/init.h>
16 #include <linux/device.h>
17 #include <linux/spinlock.h>
19 #include <linux/backlight.h>
21 #include <asm/cpu/dac.h>
22 #include <asm/hp6xx/hp6xx.h>
23 #include <asm/hd64461/hd64461.h>
25 #define HP680_MAX_INTENSITY 255
26 #define HP680_DEFAULT_INTENSITY 10
28 static int hp680bl_powermode
= FB_BLANK_UNBLANK
;
29 static int current_intensity
= 0;
30 static spinlock_t bl_lock
= SPIN_LOCK_UNLOCKED
;
32 static void hp680bl_send_intensity(int intensity
)
36 if (hp680bl_powermode
!= FB_BLANK_UNBLANK
)
39 spin_lock_irqsave(&bl_lock
, flags
);
40 sh_dac_output(255-(u8
)intensity
, DAC_LCD_BRIGHTNESS
);
41 spin_unlock_irqrestore(&bl_lock
, flags
);
44 static void hp680bl_blank(int blank
)
51 case FB_BLANK_VSYNC_SUSPEND
:
52 case FB_BLANK_HSYNC_SUSPEND
:
53 case FB_BLANK_POWERDOWN
:
54 if (hp680bl_powermode
== FB_BLANK_UNBLANK
) {
55 hp680bl_send_intensity(0);
56 hp680bl_powermode
= blank
;
57 sh_dac_disable(DAC_LCD_BRIGHTNESS
);
58 v
= inw(HD64461_GPBDR
);
59 v
|= HD64461_GPBDR_LCDOFF
;
60 outw(v
, HD64461_GPBDR
);
63 case FB_BLANK_UNBLANK
:
64 if (hp680bl_powermode
!= FB_BLANK_UNBLANK
) {
65 sh_dac_enable(DAC_LCD_BRIGHTNESS
);
66 v
= inw(HD64461_GPBDR
);
67 v
&= ~HD64461_GPBDR_LCDOFF
;
68 outw(v
, HD64461_GPBDR
);
69 hp680bl_powermode
= blank
;
70 hp680bl_send_intensity(current_intensity
);
77 static int hp680bl_suspend(struct device
*dev
, pm_message_t state
, u32 level
)
79 if (level
== SUSPEND_POWER_DOWN
)
80 hp680bl_blank(FB_BLANK_POWERDOWN
);
84 static int hp680bl_resume(struct device
*dev
, u32 level
)
86 if (level
== RESUME_POWER_ON
)
87 hp680bl_blank(FB_BLANK_UNBLANK
);
91 #define hp680bl_suspend NULL
92 #define hp680bl_resume NULL
96 static int hp680bl_set_power(struct backlight_device
*bd
, int state
)
102 static int hp680bl_get_power(struct backlight_device
*bd
)
104 return hp680bl_powermode
;
107 static int hp680bl_set_intensity(struct backlight_device
*bd
, int intensity
)
109 if (intensity
> HP680_MAX_INTENSITY
)
110 intensity
= HP680_MAX_INTENSITY
;
111 hp680bl_send_intensity(intensity
);
112 current_intensity
= intensity
;
116 static int hp680bl_get_intensity(struct backlight_device
*bd
)
118 return current_intensity
;
121 static struct backlight_properties hp680bl_data
= {
122 .owner
= THIS_MODULE
,
123 .get_power
= hp680bl_get_power
,
124 .set_power
= hp680bl_set_power
,
125 .max_brightness
= HP680_MAX_INTENSITY
,
126 .get_brightness
= hp680bl_get_intensity
,
127 .set_brightness
= hp680bl_set_intensity
,
130 static struct backlight_device
*hp680_backlight_device
;
132 static int __init
hp680bl_probe(struct device
*dev
)
134 hp680_backlight_device
= backlight_device_register ("hp680-bl",
135 NULL
, &hp680bl_data
);
136 if (IS_ERR (hp680_backlight_device
))
137 return PTR_ERR (hp680_backlight_device
);
139 hp680bl_set_intensity(NULL
, HP680_DEFAULT_INTENSITY
);
144 static int hp680bl_remove(struct device
*dev
)
146 backlight_device_unregister(hp680_backlight_device
);
151 static struct device_driver hp680bl_driver
= {
153 .bus
= &platform_bus_type
,
154 .probe
= hp680bl_probe
,
155 .remove
= hp680bl_remove
,
156 .suspend
= hp680bl_suspend
,
157 .resume
= hp680bl_resume
,
160 static struct platform_device hp680bl_device
= {
165 static int __init
hp680bl_init(void)
169 ret
=driver_register(&hp680bl_driver
);
171 ret
= platform_device_register(&hp680bl_device
);
173 driver_unregister(&hp680bl_driver
);
178 static void __exit
hp680bl_exit(void)
180 platform_device_unregister(&hp680bl_device
);
181 driver_unregister(&hp680bl_driver
);
184 module_init(hp680bl_init
);
185 module_exit(hp680bl_exit
);
187 MODULE_AUTHOR("Andriy Skulysh <askulysh@image.kiev.ua>");
188 MODULE_DESCRIPTION("HP Jornada 680 Backlight Driver");
189 MODULE_LICENSE("GPL");