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7be35c72 MG |
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 | ||
c78a6288 MS |
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 | struct backlight_ops backlight_ops; | |
7be35c72 MG |
37 | }; |
38 | ||
1a468ba1 MS |
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 | ||
c78a6288 MS |
44 | /* |
45 | * Implementation for MacBooks with Intel chipset. | |
46 | */ | |
47 | static int intel_chipset_send_intensity(struct backlight_device *bd) | |
7be35c72 MG |
48 | { |
49 | int intensity = bd->props.brightness; | |
50 | ||
1a468ba1 MS |
51 | if (debug) |
52 | printk(KERN_DEBUG "mbp_nvidia_bl: setting brightness to %d\n", | |
53 | intensity); | |
54 | ||
7be35c72 MG |
55 | outb(0x04 | (intensity << 4), 0xb3); |
56 | outb(0xbf, 0xb2); | |
7be35c72 MG |
57 | return 0; |
58 | } | |
59 | ||
c78a6288 | 60 | static int intel_chipset_get_intensity(struct backlight_device *bd) |
7be35c72 | 61 | { |
1a468ba1 MS |
62 | int intensity; |
63 | ||
7be35c72 MG |
64 | outb(0x03, 0xb3); |
65 | outb(0xbf, 0xb2); | |
1a468ba1 MS |
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; | |
7be35c72 MG |
73 | } |
74 | ||
c78a6288 MS |
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 | ||
1a468ba1 MS |
92 | if (debug) |
93 | printk(KERN_DEBUG "mbp_nvidia_bl: setting brightness to %d\n", | |
94 | intensity); | |
95 | ||
c78a6288 MS |
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 | { | |
1a468ba1 MS |
103 | int intensity; |
104 | ||
c78a6288 MS |
105 | outb(0x03, 0x52f); |
106 | outb(0xbf, 0x52e); | |
1a468ba1 MS |
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; | |
c78a6288 MS |
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 = "MacBookPro 3,1", | |
143 | .matches = { | |
144 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), | |
145 | DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro3,1"), | |
146 | }, | |
147 | .driver_data = (void *)&intel_chipset_data, | |
148 | }, | |
149 | { | |
150 | .callback = mbp_dmi_match, | |
151 | .ident = "MacBookPro 3,2", | |
152 | .matches = { | |
153 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), | |
154 | DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro3,2"), | |
155 | }, | |
156 | .driver_data = (void *)&intel_chipset_data, | |
157 | }, | |
158 | { | |
159 | .callback = mbp_dmi_match, | |
160 | .ident = "MacBookPro 4,1", | |
161 | .matches = { | |
162 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), | |
163 | DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro4,1"), | |
164 | }, | |
165 | .driver_data = (void *)&intel_chipset_data, | |
166 | }, | |
992ea659 HR |
167 | { |
168 | .callback = mbp_dmi_match, | |
169 | .ident = "MacBookAir 1,1", | |
170 | .matches = { | |
171 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), | |
172 | DMI_MATCH(DMI_PRODUCT_NAME, "MacBookAir1,1"), | |
173 | }, | |
174 | .driver_data = (void *)&intel_chipset_data, | |
175 | }, | |
c78a6288 MS |
176 | { |
177 | .callback = mbp_dmi_match, | |
178 | .ident = "MacBook 5,1", | |
179 | .matches = { | |
180 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), | |
181 | DMI_MATCH(DMI_PRODUCT_NAME, "MacBook5,1"), | |
182 | }, | |
183 | .driver_data = (void *)&nvidia_chipset_data, | |
184 | }, | |
1e9bd942 MS |
185 | { |
186 | .callback = mbp_dmi_match, | |
187 | .ident = "MacBook 5,2", | |
188 | .matches = { | |
189 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), | |
190 | DMI_MATCH(DMI_PRODUCT_NAME, "MacBook5,2"), | |
191 | }, | |
192 | .driver_data = (void *)&nvidia_chipset_data, | |
193 | }, | |
c78a6288 MS |
194 | { |
195 | .callback = mbp_dmi_match, | |
196 | .ident = "MacBookAir 2,1", | |
197 | .matches = { | |
198 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), | |
199 | DMI_MATCH(DMI_PRODUCT_NAME, "MacBookAir2,1"), | |
200 | }, | |
201 | .driver_data = (void *)&nvidia_chipset_data, | |
202 | }, | |
203 | { | |
204 | .callback = mbp_dmi_match, | |
205 | .ident = "MacBookPro 5,1", | |
206 | .matches = { | |
207 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), | |
208 | DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5,1"), | |
209 | }, | |
210 | .driver_data = (void *)&nvidia_chipset_data, | |
211 | }, | |
1e9bd942 MS |
212 | { |
213 | .callback = mbp_dmi_match, | |
214 | .ident = "MacBookPro 5,2", | |
215 | .matches = { | |
216 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), | |
217 | DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5,2"), | |
218 | }, | |
219 | .driver_data = (void *)&nvidia_chipset_data, | |
220 | }, | |
221 | { | |
222 | .callback = mbp_dmi_match, | |
223 | .ident = "MacBookPro 5,5", | |
224 | .matches = { | |
225 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), | |
226 | DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5,5"), | |
227 | }, | |
228 | .driver_data = (void *)&nvidia_chipset_data, | |
229 | }, | |
c78a6288 | 230 | { } |
7be35c72 MG |
231 | }; |
232 | ||
233 | static int __init mbp_init(void) | |
234 | { | |
235 | if (!dmi_check_system(mbp_device_table)) | |
236 | return -ENODEV; | |
237 | ||
c78a6288 MS |
238 | if (!request_region(driver_data->iostart, driver_data->iolen, |
239 | "Macbook Pro backlight")) | |
7be35c72 MG |
240 | return -ENXIO; |
241 | ||
242 | mbp_backlight_device = backlight_device_register("mbp_backlight", | |
c78a6288 | 243 | NULL, NULL, &driver_data->backlight_ops); |
7be35c72 | 244 | if (IS_ERR(mbp_backlight_device)) { |
c78a6288 | 245 | release_region(driver_data->iostart, driver_data->iolen); |
7be35c72 MG |
246 | return PTR_ERR(mbp_backlight_device); |
247 | } | |
248 | ||
249 | mbp_backlight_device->props.max_brightness = 15; | |
250 | mbp_backlight_device->props.brightness = | |
c78a6288 | 251 | driver_data->backlight_ops.get_brightness(mbp_backlight_device); |
7be35c72 MG |
252 | backlight_update_status(mbp_backlight_device); |
253 | ||
254 | return 0; | |
255 | } | |
256 | ||
257 | static void __exit mbp_exit(void) | |
258 | { | |
259 | backlight_device_unregister(mbp_backlight_device); | |
260 | ||
c78a6288 | 261 | release_region(driver_data->iostart, driver_data->iolen); |
7be35c72 MG |
262 | } |
263 | ||
264 | module_init(mbp_init); | |
265 | module_exit(mbp_exit); | |
266 | ||
267 | MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>"); | |
268 | MODULE_DESCRIPTION("Nvidia-based Macbook Pro Backlight Driver"); | |
269 | MODULE_LICENSE("GPL"); | |
239cfbde | 270 | MODULE_DEVICE_TABLE(dmi, mbp_device_table); |