2 * Backlight Driver for Nvidia 8600 in Macbook Pro
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>
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.
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.
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>
28 static struct backlight_device *mbp_backlight_device;
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;
35 /* Backlight operations structure. */
36 const struct backlight_ops backlight_ops;
39 /* Module parameters. */
41 module_param_named(debug, debug, int, 0644);
42 MODULE_PARM_DESC(debug, "Set to one to enable debugging messages.");
45 * Implementation for MacBooks with Intel chipset.
47 static int intel_chipset_send_intensity(struct backlight_device *bd)
49 int intensity = bd->props.brightness;
52 printk(KERN_DEBUG "mbp_nvidia_bl: setting brightness to %d\n",
55 outb(0x04 | (intensity << 4), 0xb3);
60 static int intel_chipset_get_intensity(struct backlight_device *bd)
66 intensity = inb(0xb3) >> 4;
69 printk(KERN_DEBUG "mbp_nvidia_bl: read brightness of %d\n",
75 static const struct dmi_match_data intel_chipset_data = {
79 .options = BL_CORE_SUSPENDRESUME,
80 .get_brightness = intel_chipset_get_intensity,
81 .update_status = intel_chipset_send_intensity,
86 * Implementation for MacBooks with Nvidia chipset.
88 static int nvidia_chipset_send_intensity(struct backlight_device *bd)
90 int intensity = bd->props.brightness;
93 printk(KERN_DEBUG "mbp_nvidia_bl: setting brightness to %d\n",
96 outb(0x04 | (intensity << 4), 0x52f);
101 static int nvidia_chipset_get_intensity(struct backlight_device *bd)
107 intensity = inb(0x52f) >> 4;
110 printk(KERN_DEBUG "mbp_nvidia_bl: read brightness of %d\n",
116 static const struct dmi_match_data nvidia_chipset_data = {
120 .options = BL_CORE_SUSPENDRESUME,
121 .get_brightness = nvidia_chipset_get_intensity,
122 .update_status = nvidia_chipset_send_intensity
129 static /* const */ struct dmi_match_data *driver_data;
131 static int mbp_dmi_match(const struct dmi_system_id *id)
133 driver_data = id->driver_data;
135 printk(KERN_INFO "mbp_nvidia_bl: %s detected\n", id->ident);
139 static const struct dmi_system_id __initdata mbp_device_table[] = {
141 .callback = mbp_dmi_match,
142 .ident = "MacBook 1,1",
144 DMI_MATCH(DMI_SYS_VENDOR, "Apple Computer, Inc."),
145 DMI_MATCH(DMI_PRODUCT_NAME, "MacBook1,1"),
147 .driver_data = (void *)&intel_chipset_data,
150 .callback = mbp_dmi_match,
151 .ident = "MacBook 2,1",
153 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
154 DMI_MATCH(DMI_PRODUCT_NAME, "MacBook2,1"),
156 .driver_data = (void *)&intel_chipset_data,
159 .callback = mbp_dmi_match,
160 .ident = "MacBook 3,1",
162 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
163 DMI_MATCH(DMI_PRODUCT_NAME, "MacBook3,1"),
165 .driver_data = (void *)&intel_chipset_data,
168 .callback = mbp_dmi_match,
169 .ident = "MacBook 4,1",
171 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
172 DMI_MATCH(DMI_PRODUCT_NAME, "MacBook4,1"),
174 .driver_data = (void *)&intel_chipset_data,
177 .callback = mbp_dmi_match,
178 .ident = "MacBook 4,2",
180 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
181 DMI_MATCH(DMI_PRODUCT_NAME, "MacBook4,2"),
183 .driver_data = (void *)&intel_chipset_data,
186 .callback = mbp_dmi_match,
187 .ident = "MacBookPro 1,1",
189 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
190 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro1,1"),
192 .driver_data = (void *)&intel_chipset_data,
195 .callback = mbp_dmi_match,
196 .ident = "MacBookPro 1,2",
198 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
199 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro1,2"),
201 .driver_data = (void *)&intel_chipset_data,
204 .callback = mbp_dmi_match,
205 .ident = "MacBookPro 2,1",
207 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
208 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro2,1"),
210 .driver_data = (void *)&intel_chipset_data,
213 .callback = mbp_dmi_match,
214 .ident = "MacBookPro 2,2",
216 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
217 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro2,2"),
219 .driver_data = (void *)&intel_chipset_data,
222 .callback = mbp_dmi_match,
223 .ident = "MacBookPro 3,1",
225 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
226 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro3,1"),
228 .driver_data = (void *)&intel_chipset_data,
231 .callback = mbp_dmi_match,
232 .ident = "MacBookPro 3,2",
234 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
235 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro3,2"),
237 .driver_data = (void *)&intel_chipset_data,
240 .callback = mbp_dmi_match,
241 .ident = "MacBookPro 4,1",
243 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
244 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro4,1"),
246 .driver_data = (void *)&intel_chipset_data,
249 .callback = mbp_dmi_match,
250 .ident = "MacBookAir 1,1",
252 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
253 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookAir1,1"),
255 .driver_data = (void *)&intel_chipset_data,
258 .callback = mbp_dmi_match,
259 .ident = "MacBook 5,1",
261 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
262 DMI_MATCH(DMI_PRODUCT_NAME, "MacBook5,1"),
264 .driver_data = (void *)&nvidia_chipset_data,
267 .callback = mbp_dmi_match,
268 .ident = "MacBook 5,2",
270 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
271 DMI_MATCH(DMI_PRODUCT_NAME, "MacBook5,2"),
273 .driver_data = (void *)&nvidia_chipset_data,
276 .callback = mbp_dmi_match,
277 .ident = "MacBook 6,1",
279 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
280 DMI_MATCH(DMI_PRODUCT_NAME, "MacBook6,1"),
282 .driver_data = (void *)&nvidia_chipset_data,
285 .callback = mbp_dmi_match,
286 .ident = "MacBookAir 2,1",
288 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
289 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookAir2,1"),
291 .driver_data = (void *)&nvidia_chipset_data,
294 .callback = mbp_dmi_match,
295 .ident = "MacBookPro 5,1",
297 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
298 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5,1"),
300 .driver_data = (void *)&nvidia_chipset_data,
303 .callback = mbp_dmi_match,
304 .ident = "MacBookPro 5,2",
306 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
307 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5,2"),
309 .driver_data = (void *)&nvidia_chipset_data,
312 .callback = mbp_dmi_match,
313 .ident = "MacBookPro 5,3",
315 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
316 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5,3"),
318 .driver_data = (void *)&nvidia_chipset_data,
321 .callback = mbp_dmi_match,
322 .ident = "MacBookPro 5,4",
324 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
325 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5,4"),
327 .driver_data = (void *)&nvidia_chipset_data,
330 .callback = mbp_dmi_match,
331 .ident = "MacBookPro 5,5",
333 DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
334 DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5,5"),
336 .driver_data = (void *)&nvidia_chipset_data,
341 static int __init mbp_init(void)
343 struct backlight_properties props;
344 if (!dmi_check_system(mbp_device_table))
347 if (!request_region(driver_data->iostart, driver_data->iolen,
348 "Macbook Pro backlight"))
351 memset(&props, 0, sizeof(struct backlight_properties));
352 props.max_brightness = 15;
353 mbp_backlight_device = backlight_device_register("mbp_backlight", NULL,
355 &driver_data->backlight_ops,
357 if (IS_ERR(mbp_backlight_device)) {
358 release_region(driver_data->iostart, driver_data->iolen);
359 return PTR_ERR(mbp_backlight_device);
362 mbp_backlight_device->props.brightness =
363 driver_data->backlight_ops.get_brightness(mbp_backlight_device);
364 backlight_update_status(mbp_backlight_device);
369 static void __exit mbp_exit(void)
371 backlight_device_unregister(mbp_backlight_device);
373 release_region(driver_data->iostart, driver_data->iolen);
376 module_init(mbp_init);
377 module_exit(mbp_exit);
379 MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
380 MODULE_DESCRIPTION("Nvidia-based Macbook Pro Backlight Driver");
381 MODULE_LICENSE("GPL");
382 MODULE_DEVICE_TABLE(dmi, mbp_device_table);