projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | ||
| 30 | static struct dmi_system_id __initdata mbp_device_table[] = { | |
| 31 | { | |
| 32 | .ident = "3,1", | |
| 33 | .matches = { | |
| 34 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), | |
| 35 | DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro3,1"), | |
| 36 | }, | |
| 37 | }, | |
| 38 | { | |
| 39 | .ident = "3,2", | |
| 40 | .matches = { | |
| 41 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), | |
| 42 | DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro3,2"), | |
| 43 | }, | |
| 44 | }, | |
| 45 | { | |
| 46 | .ident = "4,1", | |
| 47 | .matches = { | |
| 48 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), | |
| 49 | DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro4,1"), | |
| 50 | }, | |
| 51 | }, | |
| 52 | { } | |
| 53 | }; | |
| 54 | ||
| 55 | static int mbp_send_intensity(struct backlight_device *bd) | |
| 56 | { | |
| 57 | int intensity = bd->props.brightness; | |
| 58 | ||
| 59 | outb(0x04 | (intensity << 4), 0xb3); | |
| 60 | outb(0xbf, 0xb2); | |
| 61 | ||
| 62 | return 0; | |
| 63 | } | |
| 64 | ||
| 65 | static int mbp_get_intensity(struct backlight_device *bd) | |
| 66 | { | |
| 67 | outb(0x03, 0xb3); | |
| 68 | outb(0xbf, 0xb2); | |
| 69 | return inb(0xb3) >> 4; | |
| 70 | } | |
| 71 | ||
| 72 | static struct backlight_ops mbp_ops = { | |
| 73 | .get_brightness = mbp_get_intensity, | |
| 74 | .update_status = mbp_send_intensity, | |
| 75 | }; | |
| 76 | ||
| 77 | static int __init mbp_init(void) | |
| 78 | { | |
| 79 | if (!dmi_check_system(mbp_device_table)) | |
| 80 | return -ENODEV; | |
| 81 | ||
| 82 | if (!request_region(0xb2, 2, "Macbook Pro backlight")) | |
| 83 | return -ENXIO; | |
| 84 | ||
| 85 | mbp_backlight_device = backlight_device_register("mbp_backlight", | |
| 86 | NULL, NULL, | |
| 87 | &mbp_ops); | |
| 88 | if (IS_ERR(mbp_backlight_device)) { | |
| 89 | release_region(0xb2, 2); | |
| 90 | return PTR_ERR(mbp_backlight_device); | |
| 91 | } | |
| 92 | ||
| 93 | mbp_backlight_device->props.max_brightness = 15; | |
| 94 | mbp_backlight_device->props.brightness = | |
| 95 | mbp_get_intensity(mbp_backlight_device); | |
| 96 | backlight_update_status(mbp_backlight_device); | |
| 97 | ||
| 98 | return 0; | |
| 99 | } | |
| 100 | ||
| 101 | static void __exit mbp_exit(void) | |
| 102 | { | |
| 103 | backlight_device_unregister(mbp_backlight_device); | |
| 104 | ||
| 105 | release_region(0xb2, 2); | |
| 106 | } | |
| 107 | ||
| 108 | module_init(mbp_init); | |
| 109 | module_exit(mbp_exit); | |
| 110 | ||
| 111 | MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>"); | |
| 112 | MODULE_DESCRIPTION("Nvidia-based Macbook Pro Backlight Driver"); | |
| 113 | MODULE_LICENSE("GPL"); | |
| 239cfbde | 114 | MODULE_DEVICE_TABLE(dmi, mbp_device_table); |