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 | |
Mario Schwalbe | c78a628 | 2009-01-11 00:11:34 +0000 | [diff] [blame^] | 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; |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 37 | }; |
| 38 | |
Mario Schwalbe | c78a628 | 2009-01-11 00:11:34 +0000 | [diff] [blame^] | 39 | /* |
| 40 | * Implementation for MacBooks with Intel chipset. |
| 41 | */ |
| 42 | static int intel_chipset_send_intensity(struct backlight_device *bd) |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 43 | { |
| 44 | int intensity = bd->props.brightness; |
| 45 | |
| 46 | outb(0x04 | (intensity << 4), 0xb3); |
| 47 | outb(0xbf, 0xb2); |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 48 | return 0; |
| 49 | } |
| 50 | |
Mario Schwalbe | c78a628 | 2009-01-11 00:11:34 +0000 | [diff] [blame^] | 51 | static int intel_chipset_get_intensity(struct backlight_device *bd) |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 52 | { |
| 53 | outb(0x03, 0xb3); |
| 54 | outb(0xbf, 0xb2); |
| 55 | return inb(0xb3) >> 4; |
| 56 | } |
| 57 | |
Mario Schwalbe | c78a628 | 2009-01-11 00:11:34 +0000 | [diff] [blame^] | 58 | static const struct dmi_match_data intel_chipset_data = { |
| 59 | .iostart = 0xb2, |
| 60 | .iolen = 2, |
| 61 | .backlight_ops = { |
| 62 | .options = BL_CORE_SUSPENDRESUME, |
| 63 | .get_brightness = intel_chipset_get_intensity, |
| 64 | .update_status = intel_chipset_send_intensity, |
| 65 | } |
| 66 | }; |
| 67 | |
| 68 | /* |
| 69 | * Implementation for MacBooks with Nvidia chipset. |
| 70 | */ |
| 71 | static int nvidia_chipset_send_intensity(struct backlight_device *bd) |
| 72 | { |
| 73 | int intensity = bd->props.brightness; |
| 74 | |
| 75 | outb(0x04 | (intensity << 4), 0x52f); |
| 76 | outb(0xbf, 0x52e); |
| 77 | return 0; |
| 78 | } |
| 79 | |
| 80 | static int nvidia_chipset_get_intensity(struct backlight_device *bd) |
| 81 | { |
| 82 | outb(0x03, 0x52f); |
| 83 | outb(0xbf, 0x52e); |
| 84 | return inb(0x52f) >> 4; |
| 85 | } |
| 86 | |
| 87 | static const struct dmi_match_data nvidia_chipset_data = { |
| 88 | .iostart = 0x52e, |
| 89 | .iolen = 2, |
| 90 | .backlight_ops = { |
| 91 | .options = BL_CORE_SUSPENDRESUME, |
| 92 | .get_brightness = nvidia_chipset_get_intensity, |
| 93 | .update_status = nvidia_chipset_send_intensity |
| 94 | } |
| 95 | }; |
| 96 | |
| 97 | /* |
| 98 | * DMI matching. |
| 99 | */ |
| 100 | static /* const */ struct dmi_match_data *driver_data; |
| 101 | |
| 102 | static int mbp_dmi_match(const struct dmi_system_id *id) |
| 103 | { |
| 104 | driver_data = id->driver_data; |
| 105 | |
| 106 | printk(KERN_INFO "mbp_nvidia_bl: %s detected\n", id->ident); |
| 107 | return 1; |
| 108 | } |
| 109 | |
| 110 | static const struct dmi_system_id __initdata mbp_device_table[] = { |
| 111 | { |
| 112 | .callback = mbp_dmi_match, |
| 113 | .ident = "MacBookPro 3,1", |
| 114 | .matches = { |
| 115 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), |
| 116 | DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro3,1"), |
| 117 | }, |
| 118 | .driver_data = (void *)&intel_chipset_data, |
| 119 | }, |
| 120 | { |
| 121 | .callback = mbp_dmi_match, |
| 122 | .ident = "MacBookPro 3,2", |
| 123 | .matches = { |
| 124 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), |
| 125 | DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro3,2"), |
| 126 | }, |
| 127 | .driver_data = (void *)&intel_chipset_data, |
| 128 | }, |
| 129 | { |
| 130 | .callback = mbp_dmi_match, |
| 131 | .ident = "MacBookPro 4,1", |
| 132 | .matches = { |
| 133 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), |
| 134 | DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro4,1"), |
| 135 | }, |
| 136 | .driver_data = (void *)&intel_chipset_data, |
| 137 | }, |
| 138 | { |
| 139 | .callback = mbp_dmi_match, |
| 140 | .ident = "MacBook 5,1", |
| 141 | .matches = { |
| 142 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), |
| 143 | DMI_MATCH(DMI_PRODUCT_NAME, "MacBook5,1"), |
| 144 | }, |
| 145 | .driver_data = (void *)&nvidia_chipset_data, |
| 146 | }, |
| 147 | { |
| 148 | .callback = mbp_dmi_match, |
| 149 | .ident = "MacBookAir 2,1", |
| 150 | .matches = { |
| 151 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), |
| 152 | DMI_MATCH(DMI_PRODUCT_NAME, "MacBookAir2,1"), |
| 153 | }, |
| 154 | .driver_data = (void *)&nvidia_chipset_data, |
| 155 | }, |
| 156 | { |
| 157 | .callback = mbp_dmi_match, |
| 158 | .ident = "MacBookPro 5,1", |
| 159 | .matches = { |
| 160 | DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."), |
| 161 | DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro5,1"), |
| 162 | }, |
| 163 | .driver_data = (void *)&nvidia_chipset_data, |
| 164 | }, |
| 165 | { } |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 166 | }; |
| 167 | |
| 168 | static int __init mbp_init(void) |
| 169 | { |
| 170 | if (!dmi_check_system(mbp_device_table)) |
| 171 | return -ENODEV; |
| 172 | |
Mario Schwalbe | c78a628 | 2009-01-11 00:11:34 +0000 | [diff] [blame^] | 173 | if (!request_region(driver_data->iostart, driver_data->iolen, |
| 174 | "Macbook Pro backlight")) |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 175 | return -ENXIO; |
| 176 | |
| 177 | mbp_backlight_device = backlight_device_register("mbp_backlight", |
Mario Schwalbe | c78a628 | 2009-01-11 00:11:34 +0000 | [diff] [blame^] | 178 | NULL, NULL, &driver_data->backlight_ops); |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 179 | if (IS_ERR(mbp_backlight_device)) { |
Mario Schwalbe | c78a628 | 2009-01-11 00:11:34 +0000 | [diff] [blame^] | 180 | release_region(driver_data->iostart, driver_data->iolen); |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 181 | return PTR_ERR(mbp_backlight_device); |
| 182 | } |
| 183 | |
| 184 | mbp_backlight_device->props.max_brightness = 15; |
| 185 | mbp_backlight_device->props.brightness = |
Mario Schwalbe | c78a628 | 2009-01-11 00:11:34 +0000 | [diff] [blame^] | 186 | driver_data->backlight_ops.get_brightness(mbp_backlight_device); |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 187 | backlight_update_status(mbp_backlight_device); |
| 188 | |
| 189 | return 0; |
| 190 | } |
| 191 | |
| 192 | static void __exit mbp_exit(void) |
| 193 | { |
| 194 | backlight_device_unregister(mbp_backlight_device); |
| 195 | |
Mario Schwalbe | c78a628 | 2009-01-11 00:11:34 +0000 | [diff] [blame^] | 196 | release_region(driver_data->iostart, driver_data->iolen); |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 197 | } |
| 198 | |
| 199 | module_init(mbp_init); |
| 200 | module_exit(mbp_exit); |
| 201 | |
| 202 | MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>"); |
| 203 | MODULE_DESCRIPTION("Nvidia-based Macbook Pro Backlight Driver"); |
| 204 | MODULE_LICENSE("GPL"); |
David Woodhouse | 239cfbd | 2008-09-16 16:25:24 -0700 | [diff] [blame] | 205 | MODULE_DEVICE_TABLE(dmi, mbp_device_table); |