Merge branch 'for-linus' of git://git.o-hand.com/linux-rpurdie-leds
[pandora-kernel.git] / drivers / video / backlight / mbp_nvidia_bl.c
1 /*
2  *  Backlight Driver for Nvidia 8600 in Macbook Pro
3  *
4  *  Copyright (c) Red Hat <mjg@redhat.com>
5  *  Based on code from Pommed:
6  *  Copyright (C) 2006 Nicolas Boichat <nicolas @boichat.ch>
7  *  Copyright (C) 2006 Felipe Alfaro Solana <felipe_alfaro @linuxmail.org>
8  *  Copyright (C) 2007 Julien BLACHE <jb@jblache.org>
9  *
10  *  This program is free software; you can redistribute it and/or modify
11  *  it under the terms of the GNU General Public License version 2 as
12  *  published by the Free Software Foundation.
13  *
14  *  This driver triggers SMIs which cause the firmware to change the
15  *  backlight brightness. This is icky in many ways, but it's impractical to
16  *  get at the firmware code in order to figure out what it's actually doing.
17  */
18
19 #include <linux/module.h>
20 #include <linux/kernel.h>
21 #include <linux/init.h>
22 #include <linux/platform_device.h>
23 #include <linux/backlight.h>
24 #include <linux/err.h>
25 #include <linux/dmi.h>
26 #include <linux/io.h>
27
28 static struct backlight_device *mbp_backlight_device;
29
30 /* Structure to be passed to the DMI_MATCH function. */
31 struct dmi_match_data {
32         /* I/O resource to allocate. */
33         unsigned long iostart;
34         unsigned long iolen;
35         /* Backlight operations structure. */
36         const struct backlight_ops backlight_ops;
37 };
38
39 /* Module parameters. */
40 static int debug;
41 module_param_named(debug, debug, int, 0644);
42 MODULE_PARM_DESC(debug, "Set to one to enable debugging messages.");
43
44 /*
45  * Implementation for MacBooks with Intel chipset.
46  */
47 static int intel_chipset_send_intensity(struct backlight_device *bd)
48 {
49         int intensity = bd->props.brightness;
50
51         if (debug)
52                 printk(KERN_DEBUG "mbp_nvidia_bl: setting brightness to %d\n",
53                        intensity);
54
55         outb(0x04 | (intensity << 4), 0xb3);
56         outb(0xbf, 0xb2);
57         return 0;
58 }
59
60 static int intel_chipset_get_intensity(struct backlight_device *bd)
61 {
62         int intensity;
63
64         outb(0x03, 0xb3);
65         outb(0xbf, 0xb2);
66         intensity = inb(0xb3) >> 4;
67
68         if (debug)
69                 printk(KERN_DEBUG "mbp_nvidia_bl: read brightness of %d\n",
70                        intensity);
71
72         return intensity;
73 }
74
75 static const struct dmi_match_data intel_chipset_data = {
76         .iostart = 0xb2,
77         .iolen = 2,
78         .backlight_ops  = {
79                 .options        = BL_CORE_SUSPENDRESUME,
80                 .get_brightness = intel_chipset_get_intensity,
81                 .update_status  = intel_chipset_send_intensity,
82         }
83 };
84
85 /*
86  * Implementation for MacBooks with Nvidia chipset.
87  */
88 static int nvidia_chipset_send_intensity(struct backlight_device *bd)
89 {
90         int intensity = bd->props.brightness;
91
92         if (debug)
93                 printk(KERN_DEBUG "mbp_nvidia_bl: setting brightness to %d\n",
94                        intensity);
95
96         outb(0x04 | (intensity << 4), 0x52f);
97         outb(0xbf, 0x52e);
98         return 0;
99 }
100
101 static int nvidia_chipset_get_intensity(struct backlight_device *bd)
102 {
103         int intensity;
104
105         outb(0x03, 0x52f);
106         outb(0xbf, 0x52e);
107         intensity = inb(0x52f) >> 4;
108
109         if (debug)
110                 printk(KERN_DEBUG "mbp_nvidia_bl: read brightness of %d\n",
111                        intensity);
112
113         return intensity;
114 }
115
116 static const struct dmi_match_data nvidia_chipset_data = {
117         .iostart = 0x52e,
118         .iolen = 2,
119         .backlight_ops          = {
120                 .options        = BL_CORE_SUSPENDRESUME,
121                 .get_brightness = nvidia_chipset_get_intensity,
122                 .update_status  = nvidia_chipset_send_intensity
123         }
124 };
125
126 /*
127  * DMI matching.
128  */
129 static /* const */ struct dmi_match_data *driver_data;
130
131 static int mbp_dmi_match(const struct dmi_system_id *id)
132 {
133         driver_data = id->driver_data;
134
135         printk(KERN_INFO "mbp_nvidia_bl: %s detected\n", id->ident);
136         return 1;
137 }
138
139 static const struct dmi_system_id __initdata mbp_device_table[] = {
140         {
141                 .callback       = mbp_dmi_match,
142                 .ident          = "MacBook 1,1",
143                 .matches        = {
144                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
145                         DMI_MATCH(DMI_PRODUCT_NAME, "MacBook1,1"),
146                 },
147                 .driver_data    = (void *)&intel_chipset_data,
148         },
149         {
150                 .callback       = mbp_dmi_match,
151                 .ident          = "MacBook 2,1",
152                 .matches        = {
153                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
154                         DMI_MATCH(DMI_PRODUCT_NAME, "MacBook2,1"),
155                 },
156                 .driver_data    = (void *)&intel_chipset_data,
157         },
158         {
159                 .callback       = mbp_dmi_match,
160                 .ident          = "MacBook 3,1",
161                 .matches        = {
162                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
163                         DMI_MATCH(DMI_PRODUCT_NAME, "MacBook3,1"),
164                 },
165                 .driver_data    = (void *)&intel_chipset_data,
166         },
167         {
168                 .callback       = mbp_dmi_match,
169                 .ident          = "MacBook 4,1",
170                 .matches        = {
171                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
172                         DMI_MATCH(DMI_PRODUCT_NAME, "MacBook4,1"),
173                 },
174                 .driver_data    = (void *)&intel_chipset_data,
175         },
176         {
177                 .callback       = mbp_dmi_match,
178                 .ident          = "MacBook 4,2",
179                 .matches        = {
180                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
181                         DMI_MATCH(DMI_PRODUCT_NAME, "MacBook4,2"),
182                 },
183                 .driver_data    = (void *)&intel_chipset_data,
184         },
185         {
186                 .callback       = mbp_dmi_match,
187                 .ident          = "MacBookPro 3,1",
188                 .matches        = {
189                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
190                         DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro3,1"),
191                 },
192                 .driver_data    = (void *)&intel_chipset_data,
193         },
194         {
195                 .callback       = mbp_dmi_match,
196                 .ident          = "MacBookPro 3,2",
197                 .matches        = {
198                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
199                         DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro3,2"),
200                 },
201                 .driver_data    = (void *)&intel_chipset_data,
202         },
203         {
204                 .callback       = mbp_dmi_match,
205                 .ident          = "MacBookPro 4,1",
206                 .matches        = {
207                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
208                         DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro4,1"),
209                 },
210                 .driver_data    = (void *)&intel_chipset_data,
211         },
212         {
213                 .callback       = mbp_dmi_match,
214                 .ident          = "MacBookAir 1,1",
215                 .matches        = {
216                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
217                         DMI_MATCH(DMI_PRODUCT_NAME, "MacBookAir1,1"),
218                 },
219                 .driver_data    = (void *)&intel_chipset_data,
220         },
221         {
222                 .callback       = mbp_dmi_match,
223                 .ident          = "MacBook 5,1",
224                 .matches        = {
225                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
226                         DMI_MATCH(DMI_PRODUCT_NAME, "MacBook5,1"),
227                 },
228                 .driver_data    = (void *)&nvidia_chipset_data,
229         },
230         {
231                 .callback       = mbp_dmi_match,
232                 .ident          = "MacBook 5,2",
233                 .matches        = {
234                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
235                         DMI_MATCH(DMI_PRODUCT_NAME, "MacBook5,2"),
236                 },
237                 .driver_data    = (void *)&nvidia_chipset_data,
238         },
239         {
240                 .callback       = mbp_dmi_match,
241                 .ident          = "MacBookAir 2,1",
242                 .matches        = {
243                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
244                         DMI_MATCH(DMI_PRODUCT_NAME, "MacBookAir2,1"),
245                 },
246                 .driver_data    = (void *)&nvidia_chipset_data,
247         },
248         {
249                 .callback       = mbp_dmi_match,
250                 .ident          = "MacBookPro 5,1",
251                 .matches        = {
252                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
253                         DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5,1"),
254                 },
255                 .driver_data    = (void *)&nvidia_chipset_data,
256         },
257         {
258                 .callback       = mbp_dmi_match,
259                 .ident          = "MacBookPro 5,2",
260                 .matches        = {
261                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
262                         DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5,2"),
263                 },
264                 .driver_data    = (void *)&nvidia_chipset_data,
265         },
266         {
267                 .callback       = mbp_dmi_match,
268                 .ident          = "MacBookPro 5,3",
269                 .matches        = {
270                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
271                         DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5,3"),
272                 },
273                 .driver_data    = (void *)&nvidia_chipset_data,
274         },
275         {
276                 .callback       = mbp_dmi_match,
277                 .ident          = "MacBookPro 5,4",
278                 .matches        = {
279                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
280                         DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5,4"),
281                 },
282                 .driver_data    = (void *)&nvidia_chipset_data,
283         },
284         {
285                 .callback       = mbp_dmi_match,
286                 .ident          = "MacBookPro 5,5",
287                 .matches        = {
288                         DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
289                         DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5,5"),
290                 },
291                 .driver_data    = (void *)&nvidia_chipset_data,
292         },
293         { }
294 };
295
296 static int __init mbp_init(void)
297 {
298         struct backlight_properties props;
299         if (!dmi_check_system(mbp_device_table))
300                 return -ENODEV;
301
302         if (!request_region(driver_data->iostart, driver_data->iolen, 
303                                                 "Macbook Pro backlight"))
304                 return -ENXIO;
305
306         memset(&props, 0, sizeof(struct backlight_properties));
307         props.max_brightness = 15;
308         mbp_backlight_device = backlight_device_register("mbp_backlight", NULL,
309                                                          NULL,
310                                                          &driver_data->backlight_ops,
311                                                          &props);
312         if (IS_ERR(mbp_backlight_device)) {
313                 release_region(driver_data->iostart, driver_data->iolen);
314                 return PTR_ERR(mbp_backlight_device);
315         }
316
317         mbp_backlight_device->props.brightness =
318                 driver_data->backlight_ops.get_brightness(mbp_backlight_device);
319         backlight_update_status(mbp_backlight_device);
320
321         return 0;
322 }
323
324 static void __exit mbp_exit(void)
325 {
326         backlight_device_unregister(mbp_backlight_device);
327
328         release_region(driver_data->iostart, driver_data->iolen);
329 }
330
331 module_init(mbp_init);
332 module_exit(mbp_exit);
333
334 MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
335 MODULE_DESCRIPTION("Nvidia-based Macbook Pro Backlight Driver");
336 MODULE_LICENSE("GPL");
337 MODULE_DEVICE_TABLE(dmi, mbp_device_table);