1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
|
/*
* drivers/video/backlight/jornada720_bl.c
*
* Backlight Driver for HP Jornada 720
*
* Copyright (c) 2006 Filip Zyzniewski <filip.zyzniewski@tefnet.pl>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/backlight.h>
#include <linux/fb.h>
#include <linux/device.h>
#include <asm/hardware.h>
#include <asm/arch/jornada720_mcu.h>
#include <video/s1d13xxxfb.h>
MODULE_AUTHOR("Filip Zyzniewski <filip.zyzniewski@tefnet.pl>");
MODULE_DESCRIPTION("HP Jornada 720 Backlight Driver");
MODULE_LICENSE("GPL");
/*
* HP Documentation referred in this file:
* http://www.jlime.com/downloads/development/docs/jornada7xx/jornada720.txt
*/
#define JORNADA720_BL_MAX_BRIGHTNESS 0xff
/* default brightness (line 460 of HP's doc - it's
* mistakenly referred as default contrast there) */
#define JORNADA720_BL_DEFAULT_BRIGHTNESS 0x19
static struct backlight_device *jornada720_bl_device;
static int jornada720_bl_get_brightness(struct backlight_device *dev)
{
int ret;
/* check if backlight is on (line 461 of HP's doc */
if(!(PPSR & PPC_LDD1))
return 255;
/* get data from the MCU (line 310 of HP's doc) */
if(jornada720_mcu_start(jornada720_mcu_GetBrightness)) {
printk(KERN_WARNING "jornada720_bl: GetBrightness failed\n");
ret=256;
} else
ret=jornada720_mcu_read();
jornada720_mcu_end();
/* 0 is max brightness for the kernel, opposite for the MCU */
return 255-ret;
}
static int jornada720_bl_update_status(struct backlight_device *dev)
{
int ret=0;
if (dev->props->power != FB_BLANK_UNBLANK || dev->props->fb_blank != FB_BLANK_UNBLANK) {
/* turn off the backlight PWM (line 313 of HP's doc) */
ret=jornada720_mcu_start(jornada720_mcu_BrightnessOff);
if(ret)
printk(KERN_WARNING "jornada720_bl: BrightnessOff failed\n");
/* turn off the backlight (line 461 of HP's doc) */
PPSR &= ~PPC_LDD1;
PPDR |= PPC_LDD1;
}
else {
/* turn the backlight on (line 461 of HP's doc) */
PPSR |= PPC_LDD1;
/* line 309 of HP's doc */
if (!(ret=jornada720_mcu_start(jornada720_mcu_SetBrightness))) {
/* 0 is max brightness for the kernel, opposite for the MCU */
if(jornada720_mcu_byte(255 - dev->props->brightness) != jornada720_mcu_TxDummy)
ret = -1;
} else
printk(KERN_WARNING "jornada720_bl: SetBrightness failed\n");
}
jornada720_mcu_end();
return ret;
}
static struct backlight_properties jornada720_bl_data = {
.owner = THIS_MODULE,
.max_brightness = JORNADA720_BL_MAX_BRIGHTNESS,
.get_brightness = jornada720_bl_get_brightness,
.update_status = jornada720_bl_update_status,
};
static int jornada720_bl_probe(struct device *_dev)
{
/*
* name must match fb driver name (documentation of
* backlight_device_register() in backlight.c
*/
jornada720_bl_device = backlight_device_register (S1D_DEVICENAME,
NULL, NULL, &jornada720_bl_data);
if (IS_ERR (jornada720_bl_device))
return PTR_ERR (jornada720_bl_device);
jornada720_bl_data.power = FB_BLANK_UNBLANK;
jornada720_bl_data.brightness = JORNADA720_BL_DEFAULT_BRIGHTNESS;
jornada720_bl_update_status(jornada720_bl_device);
return 0;
}
static int jornada720_bl_remove(struct device *_dev)
{
backlight_device_unregister(jornada720_bl_device);
return 0;
}
static struct device_driver jornada720_bl_driver = {
.name = jornada720_mcu_bus_id_bl,
.bus = &jornada720_mcu_bus_type,
.probe = jornada720_bl_probe,
.remove = jornada720_bl_remove,
.owner = THIS_MODULE
};
static int __init jornada720_bl_init(void)
{
return driver_register(&jornada720_bl_driver);
}
static void __exit jornada720_bl_exit(void)
{
driver_unregister(&jornada720_bl_driver);
}
module_init(jornada720_bl_init);
module_exit(jornada720_bl_exit);
|
