drivers/video/backlight/mbp_nvidia_bl.c - leviathan-incoming in htc-msm-2.6.32

/*
 *  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;
};

/* Module parameters. */
static int debug;
module_param_named(debug, debug, int, 0644);
MODULE_PARM_DESC(debug, "Set to one to enable debugging messages.");

/*
 * Implementation for MacBooks with Intel chipset.
 */
static int intel_chipset_send_intensity(struct backlight_device *bd)
{
	int intensity = bd->props.brightness;

	if (debug)
		printk(KERN_DEBUG "mbp_nvidia_bl: setting brightness to %d\n",
		       intensity);

	outb(0x04 | (intensity << 4), 0xb3);
	outb(0xbf, 0xb2);
	return 0;
}

static int intel_chipset_get_intensity(struct backlight_device *bd)
{
	int intensity;

	outb(0x03, 0xb3);
	outb(0xbf, 0xb2);
	intensity = inb(0xb3) >> 4;

	if (debug)
		printk(KERN_DEBUG "mbp_nvidia_bl: read brightness of %d\n",
		       intensity);

	return intensity;
}

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;

	if (debug)
		printk(KERN_DEBUG "mbp_nvidia_bl: setting brightness to %d\n",
		       intensity);

	outb(0x04 | (intensity << 4), 0x52f);
	outb(0xbf, 0x52e);
	return 0;
}

static int nvidia_chipset_get_intensity(struct backlight_device *bd)
{
	int intensity;

	outb(0x03, 0x52f);
	outb(0xbf, 0x52e);
	intensity = inb(0x52f) >> 4;

	if (debug)
		printk(KERN_DEBUG "mbp_nvidia_bl: read brightness of %d\n",
		       intensity);

	return intensity;
}

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		= "MacBookAir 1,1",
		.matches	= {
			DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "MacBookAir1,1"),
		},
		.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		= "MacBook 5,2",
		.matches	= {
			DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "MacBook5,2"),
		},
		.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,
	},
	{
		.callback	= mbp_dmi_match,
		.ident		= "MacBookPro 5,2",
		.matches	= {
			DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5,2"),
		},
		.driver_data	= (void *)&nvidia_chipset_data,
	},
	{
		.callback	= mbp_dmi_match,
		.ident		= "MacBookPro 5,5",
		.matches	= {
			DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
			DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5,5"),
		},
		.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);

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	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 = "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	},
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	},
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	},
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	},
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	},
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	},
230	{ }
231	};
232
233	static int __init mbp_init(void)
234	{
235	if (!dmi_check_system(mbp_device_table))
236	return -ENODEV;
237
238	if (!request_region(driver_data->iostart, driver_data->iolen,
239	"Macbook Pro backlight"))
240	return -ENXIO;
241
242	mbp_backlight_device = backlight_device_register("mbp_backlight",
243	NULL, NULL, &driver_data->backlight_ops);
244	if (IS_ERR(mbp_backlight_device)) {
245	release_region(driver_data->iostart, driver_data->iolen);
246	return PTR_ERR(mbp_backlight_device);
247	}
248
249	mbp_backlight_device->props.max_brightness = 15;
250	mbp_backlight_device->props.brightness =
251	driver_data->backlight_ops.get_brightness(mbp_backlight_device);
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
261	release_region(driver_data->iostart, driver_data->iolen);
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");
270	MODULE_DEVICE_TABLE(dmi, mbp_device_table);

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