Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 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"); |
David Woodhouse | 239cfbd | 2008-09-16 16:25:24 -0700 | [diff] [blame^] | 114 | MODULE_DEVICE_TABLE(dmi, mbp_device_table); |