forked from xonatius/samsung-backlight
-
Notifications
You must be signed in to change notification settings - Fork 0
/
samsung-backlight.c
315 lines (289 loc) · 11.6 KB
/
samsung-backlight.c
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
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
/*
* Samsung N130, N220, N230 NC10, Np-Q45, R468/R418, X320/X420/X520, X360,
* R518, R510/P510, R410, NF110/NF210/NF310, N350, R470/R420, R528/R728
* Laptop Backlight driver
*
* Copyright (C) 2011 Peter Savichev (proton) (psavichev@gmail.com)
* Copyright (C) 2010 xonatius (xonatius@gmail.com)
* Copyright (C) 2010 elemc, sergem (fedora@conference.jabber.ru)
* Copyright (C) 2009 Greg Kroah-Hartman (gregkh@suse.de)
* Copyright (C) 2009 Novell Inc.
*
* 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/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/backlight.h>
#include <linux/fb.h>
#include <linux/dmi.h>
#define MAX_BRIGHT 0x07
#define OFFSET 0xf4
/*
* HAL/gnome-display-manager really wants us to only set 8 different levels for
* the brightness control. And since 256 different levels seems a bit
* overkill, that's fine. So let's map the 256 values to 8 different ones:
*
* userspace 0 1 2 3 4 5 6 7
* hardware 3 39 75 111 147 183 219 255
*
* or hardware = (userspace * 36) + 3
*
* Note, we keep value 0 at a positive value, otherwise the screen goes
* blank because HAL likes to set the backlight to 0 at startup when there is
* no power plugged in.
*/
static int offset = OFFSET;
module_param(offset, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(offset, "The offset into the PCI device for the brightness control");
static struct pci_dev *pci_device;
static struct backlight_device *backlight_device;
static u8 read_brightness(void)
{
u8 kernel_brightness;
u8 user_brightness = 0;
pci_read_config_byte(pci_device, offset, &kernel_brightness);
user_brightness = (kernel_brightness - 3) / 36;
return user_brightness;
}
static void set_brightness(u8 user_brightness)
{
u16 kernel_brightness = 0;
kernel_brightness = (user_brightness * 36) + 3;
pci_write_config_byte(pci_device, offset, (u8)kernel_brightness);
}
static int get_brightness(struct backlight_device *bd)
{
return bd->props.brightness;
}
static int update_status(struct backlight_device *bd)
{
set_brightness(bd->props.brightness);
return 0;
}
static struct backlight_ops backlight_ops = {
.get_brightness = get_brightness,
.update_status = update_status,
};
static int __init dmi_check_cb(const struct dmi_system_id *id)
{
printk(KERN_INFO KBUILD_MODNAME ": found laptop model '%s'\n",
id->ident);
return 0;
}
static struct dmi_system_id __initdata samsung_dmi_table[] = {
{
.ident = "N120",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
DMI_MATCH(DMI_PRODUCT_NAME, "N120"),
DMI_MATCH(DMI_BOARD_NAME, "N120"),
},
.callback = dmi_check_cb,
},
{
.ident = "N130",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
DMI_MATCH(DMI_PRODUCT_NAME, "N130"),
DMI_MATCH(DMI_BOARD_NAME, "N130"),
},
.callback = dmi_check_cb,
},
{
.ident = "NC10",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
DMI_MATCH(DMI_PRODUCT_NAME, "NC10"),
DMI_MATCH(DMI_BOARD_NAME, "NC10"),
},
.callback = dmi_check_cb,
},
{
.ident = "NP-Q45",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
DMI_MATCH(DMI_PRODUCT_NAME, "SQ45S70S"),
DMI_MATCH(DMI_BOARD_NAME, "SQ45S70S"),
},
.callback = dmi_check_cb,
},
{
.ident = "R410 Plus",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
DMI_MATCH(DMI_PRODUCT_NAME, "R410P"),
DMI_MATCH(DMI_BOARD_NAME, "R460"),
},
.callback = dmi_check_cb,
},
{
.ident = "R468/R418",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
DMI_MATCH(DMI_PRODUCT_NAME, "R468/R418"),
DMI_MATCH(DMI_BOARD_NAME, "R468/R418"),
},
.callback = dmi_check_cb,
},
{
.ident = "X320/X420/X520",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
DMI_MATCH(DMI_PRODUCT_NAME, "X320/X420/X520"),
DMI_MATCH(DMI_BOARD_NAME, "X320/X420/X520"),
},
.callback = dmi_check_cb,
},
{
.ident = "X360",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
DMI_MATCH(DMI_PRODUCT_NAME, "X360"),
DMI_MATCH(DMI_BOARD_NAME, "X360"),
},
.callback = dmi_check_cb,
},
{
.ident = "R518",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
DMI_MATCH(DMI_PRODUCT_NAME, "R518"),
DMI_MATCH(DMI_BOARD_NAME, "R518"),
},
.callback = dmi_check_cb,
},
{
.ident = "R510/P510",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
DMI_MATCH(DMI_PRODUCT_NAME, "R510/P510"),
DMI_MATCH(DMI_BOARD_NAME, "R510/P510"),
},
.callback = dmi_check_cb,
},
{
.ident = "NF110/NF210/NF310",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
DMI_MATCH(DMI_PRODUCT_NAME, "NF110/NF210/NF310"),
DMI_MATCH(DMI_BOARD_NAME, "NF110/NF210/NF310"),
},
.callback = dmi_check_cb,
},
{
.ident = "N220",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
DMI_MATCH(DMI_PRODUCT_NAME, "N220"),
DMI_MATCH(DMI_BOARD_NAME, "N220"),
},
.callback = dmi_check_cb,
},
{
.ident = "N230",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
DMI_MATCH(DMI_PRODUCT_NAME, "N230"),
DMI_MATCH(DMI_BOARD_NAME, "N230"),
},
.callback = dmi_check_cb,
},
{
.ident = "N350",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
DMI_MATCH(DMI_PRODUCT_NAME, "N350"),
DMI_MATCH(DMI_BOARD_NAME, "N350"),
},
.callback = dmi_check_cb,
},
{
.ident = "R470/R420",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
DMI_MATCH(DMI_PRODUCT_NAME, "R470/R420"),
DMI_MATCH(DMI_BOARD_NAME, "R470/R420"),
},
.callback = dmi_check_cb,
},
{
.ident = "R528/R728",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
DMI_MATCH(DMI_PRODUCT_NAME, "R528/R728"),
DMI_MATCH(DMI_BOARD_NAME, "R528/R728"),
},
.callback = dmi_check_cb,
},
{ },
};
static int __init samsung_init(void)
{
struct backlight_properties props;
memset(&props, 0, sizeof(struct backlight_properties));
if (!dmi_check_system(samsung_dmi_table))
return -ENODEV;
/*
* The Samsung N120, N130, and NC10 use pci device id 0x27ae, while the
* NP-Q45 uses 0x2a02
* R410P, R468/R418, R518, R510/P510, X320/X420/X520, X360, R470/R420
* and R528/R728 uses 0x2a42
* N220, NF110/NF210/NF310 and N350 uses 0xa011
* Odds are we might need to add more to the
* list over time...
*/
pci_device = pci_get_device(PCI_VENDOR_ID_INTEL, 0x27ae, NULL);
if (!pci_device)
pci_device = pci_get_device(PCI_VENDOR_ID_INTEL, 0x2a02, NULL);
if (!pci_device)
pci_device = pci_get_device(PCI_VENDOR_ID_INTEL, 0x2a42, NULL);
if (!pci_device)
pci_device = pci_get_device(PCI_VENDOR_ID_INTEL, 0xa011, NULL);
if (!pci_device)
return -ENODEV;
/* create a backlight device to talk to this one */
backlight_device = backlight_device_register("samsung",
&pci_device->dev,
NULL, &backlight_ops, &props);
if (IS_ERR(backlight_device)) {
pci_dev_put(pci_device);
return PTR_ERR(backlight_device);
}
backlight_device->props.max_brightness = MAX_BRIGHT;
backlight_device->props.brightness = read_brightness();
backlight_device->props.power = FB_BLANK_UNBLANK;
backlight_update_status(backlight_device);
return 0;
}
static void __exit samsung_exit(void)
{
backlight_device_unregister(backlight_device);
/* we are done with the PCI device, put it back */
pci_dev_put(pci_device);
}
module_init(samsung_init);
module_exit(samsung_exit);
MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@suse.de>");
MODULE_DESCRIPTION("Samsung Backlight driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("dmi:*:svnSAMSUNGELECTRONICSCO.,LTD.:pnN120:*:rnN120:*");
MODULE_ALIAS("dmi:*:svnSAMSUNGELECTRONICSCO.,LTD.:pnN130:*:rnN130:*");
MODULE_ALIAS("dmi:*:svnSAMSUNGELECTRONICSCO.,LTD.:pnNC10:*:rnNC10:*");
MODULE_ALIAS("dmi:*:svnSAMSUNGELECTRONICSCO.,LTD.:pnSQ45S70S:*:rnSQ45S70S:*");
MODULE_ALIAS("dmi:*:svnSAMSUNGELECTRONICSCO.,LTD.:pnR410P:*:rnR410P:*");
MODULE_ALIAS("dmi:*:svnSAMSUNGELECTRONICSCO.,LTD.:pnR468/R418:*:rnR468/R418:*");
MODULE_ALIAS("dmi:*:svnSAMSUNGELECTRONICSCO.,LTD.:pnX320/X420/X520:*:rnX320/X420/X520:*");
MODULE_ALIAS("dmi:*:svnSAMSUNGELECTRONICSCO.,LTD.:pnX360:*:rnX360:*");
MODULE_ALIAS("dmi:*:svnSAMSUNGELECTRONICSCO.,LTD.:pnR518:*:rnR518:*");
MODULE_ALIAS("dmi:*:svnSAMSUNGELECTRONICSCO.,LTD.:pnR510/P510:*:rnR510/P510:*");
MODULE_ALIAS("dmi:*:svnSAMSUNGELECTRONICSCO.,LTD.:pnNF110/NF210/NF310:*:rnNF110/NF210/NF310:*");
MODULE_ALIAS("dmi:*:svnSAMSUNGELECTRONICSCO.,LTD.:pnN220:*:rnN220:*");
MODULE_ALIAS("dmi:*:svnSAMSUNGELECTRONICSCO.,LTD.:pnN230:*:rnN230:*");
MODULE_ALIAS("dmi:*:svnSAMSUNGELECTRONICSCO.,LTD.:pnN350:*:rnN350:*");
MODULE_ALIAS("dmi:*:svnSAMSUNGELECTRONICSCO.,LTD.:pnR470/R420:*:rnR470/R420:*");
MODULE_ALIAS("dmi:*:svnSAMSUNGELECTRONICSCO.,LTD.:pnR528/R728:*:rnR528/R728:*");