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
146
147
148
149
150
151
152
153
154
155
156
157
158
159
|
// SPDX-License-Identifier: GPL-2.0-only
/*
* Driver for Samsung Q10 and related laptops: controls the backlight
*
* Copyright (c) 2011 Frederick van der Wyck <fvanderwyck@gmail.com>
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/backlight.h>
#include <linux/dmi.h>
#include <linux/acpi.h>
#define SAMSUNGQ10_BL_MAX_INTENSITY 7
static acpi_handle ec_handle;
static bool force;
module_param(force, bool, 0);
MODULE_PARM_DESC(force,
"Disable the DMI check and force the driver to be loaded");
static int samsungq10_bl_set_intensity(struct backlight_device *bd)
{
acpi_status status;
int i;
for (i = 0; i < SAMSUNGQ10_BL_MAX_INTENSITY; i++) {
status = acpi_evaluate_object(ec_handle, "_Q63", NULL, NULL);
if (ACPI_FAILURE(status))
return -EIO;
}
for (i = 0; i < bd->props.brightness; i++) {
status = acpi_evaluate_object(ec_handle, "_Q64", NULL, NULL);
if (ACPI_FAILURE(status))
return -EIO;
}
return 0;
}
static const struct backlight_ops samsungq10_bl_ops = {
.update_status = samsungq10_bl_set_intensity,
};
static int samsungq10_probe(struct platform_device *pdev)
{
struct backlight_properties props;
struct backlight_device *bd;
memset(&props, 0, sizeof(struct backlight_properties));
props.type = BACKLIGHT_PLATFORM;
props.max_brightness = SAMSUNGQ10_BL_MAX_INTENSITY;
bd = backlight_device_register("samsung", &pdev->dev, NULL,
&samsungq10_bl_ops, &props);
if (IS_ERR(bd))
return PTR_ERR(bd);
platform_set_drvdata(pdev, bd);
return 0;
}
static int samsungq10_remove(struct platform_device *pdev)
{
struct backlight_device *bd = platform_get_drvdata(pdev);
backlight_device_unregister(bd);
return 0;
}
static struct platform_driver samsungq10_driver = {
.driver = {
.name = KBUILD_MODNAME,
},
.probe = samsungq10_probe,
.remove = samsungq10_remove,
};
static struct platform_device *samsungq10_device;
static int __init dmi_check_callback(const struct dmi_system_id *id)
{
printk(KERN_INFO KBUILD_MODNAME ": found model '%s'\n", id->ident);
return 1;
}
static const struct dmi_system_id samsungq10_dmi_table[] __initconst = {
{
.ident = "Samsung Q10",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Samsung"),
DMI_MATCH(DMI_PRODUCT_NAME, "SQ10"),
},
.callback = dmi_check_callback,
},
{
.ident = "Samsung Q20",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG Electronics"),
DMI_MATCH(DMI_PRODUCT_NAME, "SENS Q20"),
},
.callback = dmi_check_callback,
},
{
.ident = "Samsung Q25",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG Electronics"),
DMI_MATCH(DMI_PRODUCT_NAME, "NQ25"),
},
.callback = dmi_check_callback,
},
{
.ident = "Dell Latitude X200",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Computer Corporation"),
DMI_MATCH(DMI_PRODUCT_NAME, "X200"),
},
.callback = dmi_check_callback,
},
{ },
};
MODULE_DEVICE_TABLE(dmi, samsungq10_dmi_table);
static int __init samsungq10_init(void)
{
if (!force && !dmi_check_system(samsungq10_dmi_table))
return -ENODEV;
ec_handle = ec_get_handle();
if (!ec_handle)
return -ENODEV;
samsungq10_device = platform_create_bundle(&samsungq10_driver,
samsungq10_probe,
NULL, 0, NULL, 0);
return PTR_ERR_OR_ZERO(samsungq10_device);
}
static void __exit samsungq10_exit(void)
{
platform_device_unregister(samsungq10_device);
platform_driver_unregister(&samsungq10_driver);
}
module_init(samsungq10_init);
module_exit(samsungq10_exit);
MODULE_AUTHOR("Frederick van der Wyck <fvanderwyck@gmail.com>");
MODULE_DESCRIPTION("Samsung Q10 Driver");
MODULE_LICENSE("GPL");
|
