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
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
|
/*
* Backlight Driver for Nvidia 8600 in Macbook Pro
*
* Copyright (c) Red Hat <mjg@redhat.com>
* Based on code from Pommed:
* Copyright (C) 2006 Nicolas Boichat <nicolas @boichat.ch>
* Copyright (C) 2006 Felipe Alfaro Solana <felipe_alfaro @linuxmail.org>
* Copyright (C) 2007 Julien BLACHE <jb@jblache.org>
*
* 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.
*
* This driver triggers SMIs which cause the firmware to change the
* backlight brightness. This is icky in many ways, but it's impractical to
* get at the firmware code in order to figure out what it's actually doing.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/backlight.h>
#include <linux/err.h>
#include <linux/dmi.h>
#include <linux/io.h>
static struct backlight_device *mbp_backlight_device;
/* Structure to be passed to the DMI_MATCH function. */
struct dmi_match_data {
/* I/O resource to allocate. */
unsigned long iostart;
unsigned long iolen;
/* Backlight operations structure. */
struct backlight_ops backlight_ops;
};
/*
* Implementation for MacBooks with Intel chipset.
*/
static int intel_chipset_send_intensity(struct backlight_device *bd)
{
int intensity = bd->props.brightness;
outb(0x04 | (intensity << 4), 0xb3);
outb(0xbf, 0xb2);
return 0;
}
static int intel_chipset_get_intensity(struct backlight_device *bd)
{
outb(0x03, 0xb3);
outb(0xbf, 0xb2);
return inb(0xb3) >> 4;
}
static const struct dmi_match_data intel_chipset_data = {
.iostart = 0xb2,
.iolen = 2,
.backlight_ops = {
.options = BL_CORE_SUSPENDRESUME,
.get_brightness = intel_chipset_get_intensity,
.update_status = intel_chipset_send_intensity,
}
};
/*
* Implementation for MacBooks with Nvidia chipset.
*/
static int nvidia_chipset_send_intensity(struct backlight_device *bd)
{
int intensity = bd->props.brightness;
outb(0x04 | (intensity << 4), 0x52f);
outb(0xbf, 0x52e);
return 0;
}
static int nvidia_chipset_get_intensity(struct backlight_device *bd)
{
outb(0x03, 0x52f);
outb(0xbf, 0x52e);
return inb(0x52f) >> 4;
}
static const struct dmi_match_data nvidia_chipset_data = {
.iostart = 0x52e,
.iolen = 2,
.backlight_ops = {
.options = BL_CORE_SUSPENDRESUME,
.get_brightness = nvidia_chipset_get_intensity,
.update_status = nvidia_chipset_send_intensity
}
};
/*
* DMI matching.
*/
static /* const */ struct dmi_match_data *driver_data;
static int mbp_dmi_match(const struct dmi_system_id *id)
{
driver_data = id->driver_data;
printk(KERN_INFO "mbp_nvidia_bl: %s detected\n", id->ident);
return 1;
}
static const struct dmi_system_id __initdata mbp_device_table[] = {
{
.callback = mbp_dmi_match,
.ident = "MacBookPro 3,1",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro3,1"),
},
.driver_data = (void *)&intel_chipset_data,
},
{
.callback = mbp_dmi_match,
.ident = "MacBookPro 3,2",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro3,2"),
},
.driver_data = (void *)&intel_chipset_data,
},
{
.callback = mbp_dmi_match,
.ident = "MacBookPro 4,1",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro4,1"),
},
.driver_data = (void *)&intel_chipset_data,
},
{
.callback = mbp_dmi_match,
.ident = "MacBook 5,1",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
DMI_MATCH(DMI_PRODUCT_NAME, "MacBook5,1"),
},
.driver_data = (void *)&nvidia_chipset_data,
},
{
.callback = mbp_dmi_match,
.ident = "MacBookAir 2,1",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
DMI_MATCH(DMI_PRODUCT_NAME, "MacBookAir2,1"),
},
.driver_data = (void *)&nvidia_chipset_data,
},
{
.callback = mbp_dmi_match,
.ident = "MacBookPro 5,1",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5,1"),
},
.driver_data = (void *)&nvidia_chipset_data,
},
{ }
};
static int __init mbp_init(void)
{
if (!dmi_check_system(mbp_device_table))
return -ENODEV;
if (!request_region(driver_data->iostart, driver_data->iolen,
"Macbook Pro backlight"))
return -ENXIO;
mbp_backlight_device = backlight_device_register("mbp_backlight",
NULL, NULL, &driver_data->backlight_ops);
if (IS_ERR(mbp_backlight_device)) {
release_region(driver_data->iostart, driver_data->iolen);
return PTR_ERR(mbp_backlight_device);
}
mbp_backlight_device->props.max_brightness = 15;
mbp_backlight_device->props.brightness =
driver_data->backlight_ops.get_brightness(mbp_backlight_device);
backlight_update_status(mbp_backlight_device);
return 0;
}
static void __exit mbp_exit(void)
{
backlight_device_unregister(mbp_backlight_device);
release_region(driver_data->iostart, driver_data->iolen);
}
module_init(mbp_init);
module_exit(mbp_exit);
MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
MODULE_DESCRIPTION("Nvidia-based Macbook Pro Backlight Driver");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(dmi, mbp_device_table);
|
