Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 1 | /* |
Matthew Garrett | 39b3dee | 2011-03-22 16:30:28 -0700 | [diff] [blame] | 2 | * Backlight Driver for Intel-based Apples |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 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> |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 22 | #include <linux/backlight.h> |
| 23 | #include <linux/err.h> |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 24 | #include <linux/io.h> |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 25 | #include <linux/pci.h> |
| 26 | #include <linux/acpi.h> |
Seth Forshee | 83e72dd | 2012-03-16 14:41:21 -0500 | [diff] [blame] | 27 | #include <linux/atomic.h> |
H Hartley Sweeten | 1615d210 | 2012-05-29 15:07:14 -0700 | [diff] [blame] | 28 | #include <linux/apple_bl.h> |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 29 | |
Matthew Garrett | 39b3dee | 2011-03-22 16:30:28 -0700 | [diff] [blame] | 30 | static struct backlight_device *apple_backlight_device; |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 31 | |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 32 | struct hw_data { |
Mario Schwalbe | c78a628 | 2009-01-11 00:11:34 +0000 | [diff] [blame] | 33 | /* I/O resource to allocate. */ |
| 34 | unsigned long iostart; |
| 35 | unsigned long iolen; |
| 36 | /* Backlight operations structure. */ |
Emese Revfy | 9905a43 | 2009-12-14 00:58:57 +0100 | [diff] [blame] | 37 | const struct backlight_ops backlight_ops; |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 38 | void (*set_brightness)(int); |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 39 | }; |
| 40 | |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 41 | static const struct hw_data *hw_data; |
| 42 | |
Matthew Garrett | 39b3dee | 2011-03-22 16:30:28 -0700 | [diff] [blame] | 43 | #define DRIVER "apple_backlight: " |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 44 | |
Mario Schwalbe | 1a468ba | 2009-01-11 00:19:31 +0000 | [diff] [blame] | 45 | /* Module parameters. */ |
| 46 | static int debug; |
| 47 | module_param_named(debug, debug, int, 0644); |
| 48 | MODULE_PARM_DESC(debug, "Set to one to enable debugging messages."); |
| 49 | |
Mario Schwalbe | c78a628 | 2009-01-11 00:11:34 +0000 | [diff] [blame] | 50 | /* |
Matthew Garrett | 39b3dee | 2011-03-22 16:30:28 -0700 | [diff] [blame] | 51 | * Implementation for machines with Intel chipset. |
Mario Schwalbe | c78a628 | 2009-01-11 00:11:34 +0000 | [diff] [blame] | 52 | */ |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 53 | static void intel_chipset_set_brightness(int intensity) |
| 54 | { |
| 55 | outb(0x04 | (intensity << 4), 0xb3); |
| 56 | outb(0xbf, 0xb2); |
| 57 | } |
| 58 | |
Mario Schwalbe | c78a628 | 2009-01-11 00:11:34 +0000 | [diff] [blame] | 59 | static int intel_chipset_send_intensity(struct backlight_device *bd) |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 60 | { |
| 61 | int intensity = bd->props.brightness; |
| 62 | |
Mario Schwalbe | 1a468ba | 2009-01-11 00:19:31 +0000 | [diff] [blame] | 63 | if (debug) |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 64 | printk(KERN_DEBUG DRIVER "setting brightness to %d\n", |
Mario Schwalbe | 1a468ba | 2009-01-11 00:19:31 +0000 | [diff] [blame] | 65 | intensity); |
| 66 | |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 67 | intel_chipset_set_brightness(intensity); |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 68 | return 0; |
| 69 | } |
| 70 | |
Mario Schwalbe | c78a628 | 2009-01-11 00:11:34 +0000 | [diff] [blame] | 71 | static int intel_chipset_get_intensity(struct backlight_device *bd) |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 72 | { |
Mario Schwalbe | 1a468ba | 2009-01-11 00:19:31 +0000 | [diff] [blame] | 73 | int intensity; |
| 74 | |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 75 | outb(0x03, 0xb3); |
| 76 | outb(0xbf, 0xb2); |
Mario Schwalbe | 1a468ba | 2009-01-11 00:19:31 +0000 | [diff] [blame] | 77 | intensity = inb(0xb3) >> 4; |
| 78 | |
| 79 | if (debug) |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 80 | printk(KERN_DEBUG DRIVER "read brightness of %d\n", |
Mario Schwalbe | 1a468ba | 2009-01-11 00:19:31 +0000 | [diff] [blame] | 81 | intensity); |
| 82 | |
| 83 | return intensity; |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 84 | } |
| 85 | |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 86 | static const struct hw_data intel_chipset_data = { |
Mario Schwalbe | c78a628 | 2009-01-11 00:11:34 +0000 | [diff] [blame] | 87 | .iostart = 0xb2, |
| 88 | .iolen = 2, |
| 89 | .backlight_ops = { |
| 90 | .options = BL_CORE_SUSPENDRESUME, |
| 91 | .get_brightness = intel_chipset_get_intensity, |
| 92 | .update_status = intel_chipset_send_intensity, |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 93 | }, |
| 94 | .set_brightness = intel_chipset_set_brightness, |
Mario Schwalbe | c78a628 | 2009-01-11 00:11:34 +0000 | [diff] [blame] | 95 | }; |
| 96 | |
| 97 | /* |
Matthew Garrett | 39b3dee | 2011-03-22 16:30:28 -0700 | [diff] [blame] | 98 | * Implementation for machines with Nvidia chipset. |
Mario Schwalbe | c78a628 | 2009-01-11 00:11:34 +0000 | [diff] [blame] | 99 | */ |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 100 | static void nvidia_chipset_set_brightness(int intensity) |
| 101 | { |
| 102 | outb(0x04 | (intensity << 4), 0x52f); |
| 103 | outb(0xbf, 0x52e); |
| 104 | } |
| 105 | |
Mario Schwalbe | c78a628 | 2009-01-11 00:11:34 +0000 | [diff] [blame] | 106 | static int nvidia_chipset_send_intensity(struct backlight_device *bd) |
| 107 | { |
| 108 | int intensity = bd->props.brightness; |
| 109 | |
Mario Schwalbe | 1a468ba | 2009-01-11 00:19:31 +0000 | [diff] [blame] | 110 | if (debug) |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 111 | printk(KERN_DEBUG DRIVER "setting brightness to %d\n", |
Mario Schwalbe | 1a468ba | 2009-01-11 00:19:31 +0000 | [diff] [blame] | 112 | intensity); |
| 113 | |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 114 | nvidia_chipset_set_brightness(intensity); |
Mario Schwalbe | c78a628 | 2009-01-11 00:11:34 +0000 | [diff] [blame] | 115 | return 0; |
| 116 | } |
| 117 | |
| 118 | static int nvidia_chipset_get_intensity(struct backlight_device *bd) |
| 119 | { |
Mario Schwalbe | 1a468ba | 2009-01-11 00:19:31 +0000 | [diff] [blame] | 120 | int intensity; |
| 121 | |
Mario Schwalbe | c78a628 | 2009-01-11 00:11:34 +0000 | [diff] [blame] | 122 | outb(0x03, 0x52f); |
| 123 | outb(0xbf, 0x52e); |
Mario Schwalbe | 1a468ba | 2009-01-11 00:19:31 +0000 | [diff] [blame] | 124 | intensity = inb(0x52f) >> 4; |
| 125 | |
| 126 | if (debug) |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 127 | printk(KERN_DEBUG DRIVER "read brightness of %d\n", |
Mario Schwalbe | 1a468ba | 2009-01-11 00:19:31 +0000 | [diff] [blame] | 128 | intensity); |
| 129 | |
| 130 | return intensity; |
Mario Schwalbe | c78a628 | 2009-01-11 00:11:34 +0000 | [diff] [blame] | 131 | } |
| 132 | |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 133 | static const struct hw_data nvidia_chipset_data = { |
Mario Schwalbe | c78a628 | 2009-01-11 00:11:34 +0000 | [diff] [blame] | 134 | .iostart = 0x52e, |
| 135 | .iolen = 2, |
| 136 | .backlight_ops = { |
| 137 | .options = BL_CORE_SUSPENDRESUME, |
| 138 | .get_brightness = nvidia_chipset_get_intensity, |
| 139 | .update_status = nvidia_chipset_send_intensity |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 140 | }, |
| 141 | .set_brightness = nvidia_chipset_set_brightness, |
Mario Schwalbe | c78a628 | 2009-01-11 00:11:34 +0000 | [diff] [blame] | 142 | }; |
| 143 | |
Matthew Garrett | 39b3dee | 2011-03-22 16:30:28 -0700 | [diff] [blame] | 144 | static int __devinit apple_bl_add(struct acpi_device *dev) |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 145 | { |
Matthew Garrett | a19a6ee | 2010-02-17 16:39:44 -0500 | [diff] [blame] | 146 | struct backlight_properties props; |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 147 | struct pci_dev *host; |
Matthew Garrett | 99fd28e | 2011-03-22 16:30:27 -0700 | [diff] [blame] | 148 | int intensity; |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 149 | |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 150 | host = pci_get_bus_and_slot(0, 0); |
| 151 | |
| 152 | if (!host) { |
| 153 | printk(KERN_ERR DRIVER "unable to find PCI host\n"); |
| 154 | return -ENODEV; |
| 155 | } |
| 156 | |
| 157 | if (host->vendor == PCI_VENDOR_ID_INTEL) |
| 158 | hw_data = &intel_chipset_data; |
| 159 | else if (host->vendor == PCI_VENDOR_ID_NVIDIA) |
| 160 | hw_data = &nvidia_chipset_data; |
| 161 | |
| 162 | pci_dev_put(host); |
| 163 | |
| 164 | if (!hw_data) { |
| 165 | printk(KERN_ERR DRIVER "unknown hardware\n"); |
| 166 | return -ENODEV; |
| 167 | } |
| 168 | |
Matthew Garrett | 99fd28e | 2011-03-22 16:30:27 -0700 | [diff] [blame] | 169 | /* Check that the hardware responds - this may not work under EFI */ |
| 170 | |
| 171 | intensity = hw_data->backlight_ops.get_brightness(NULL); |
| 172 | |
| 173 | if (!intensity) { |
| 174 | hw_data->set_brightness(1); |
| 175 | if (!hw_data->backlight_ops.get_brightness(NULL)) |
| 176 | return -ENODEV; |
| 177 | |
| 178 | hw_data->set_brightness(0); |
| 179 | } |
| 180 | |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 181 | if (!request_region(hw_data->iostart, hw_data->iolen, |
Matthew Garrett | 39b3dee | 2011-03-22 16:30:28 -0700 | [diff] [blame] | 182 | "Apple backlight")) |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 183 | return -ENXIO; |
| 184 | |
Matthew Garrett | a19a6ee | 2010-02-17 16:39:44 -0500 | [diff] [blame] | 185 | memset(&props, 0, sizeof(struct backlight_properties)); |
Matthew Garrett | bb7ca74 | 2011-03-22 16:30:21 -0700 | [diff] [blame] | 186 | props.type = BACKLIGHT_PLATFORM; |
Matthew Garrett | a19a6ee | 2010-02-17 16:39:44 -0500 | [diff] [blame] | 187 | props.max_brightness = 15; |
Matthew Garrett | 39b3dee | 2011-03-22 16:30:28 -0700 | [diff] [blame] | 188 | apple_backlight_device = backlight_device_register("apple_backlight", |
| 189 | NULL, NULL, &hw_data->backlight_ops, &props); |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 190 | |
Matthew Garrett | 39b3dee | 2011-03-22 16:30:28 -0700 | [diff] [blame] | 191 | if (IS_ERR(apple_backlight_device)) { |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 192 | release_region(hw_data->iostart, hw_data->iolen); |
Matthew Garrett | 39b3dee | 2011-03-22 16:30:28 -0700 | [diff] [blame] | 193 | return PTR_ERR(apple_backlight_device); |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 194 | } |
| 195 | |
Matthew Garrett | 39b3dee | 2011-03-22 16:30:28 -0700 | [diff] [blame] | 196 | apple_backlight_device->props.brightness = |
| 197 | hw_data->backlight_ops.get_brightness(apple_backlight_device); |
| 198 | backlight_update_status(apple_backlight_device); |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 199 | |
| 200 | return 0; |
| 201 | } |
| 202 | |
Matthew Garrett | 39b3dee | 2011-03-22 16:30:28 -0700 | [diff] [blame] | 203 | static int __devexit apple_bl_remove(struct acpi_device *dev, int type) |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 204 | { |
Matthew Garrett | 39b3dee | 2011-03-22 16:30:28 -0700 | [diff] [blame] | 205 | backlight_device_unregister(apple_backlight_device); |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 206 | |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 207 | release_region(hw_data->iostart, hw_data->iolen); |
| 208 | hw_data = NULL; |
| 209 | return 0; |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 210 | } |
| 211 | |
Matthew Garrett | 39b3dee | 2011-03-22 16:30:28 -0700 | [diff] [blame] | 212 | static const struct acpi_device_id apple_bl_ids[] = { |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 213 | {"APP0002", 0}, |
| 214 | {"", 0}, |
| 215 | }; |
| 216 | |
Matthew Garrett | 39b3dee | 2011-03-22 16:30:28 -0700 | [diff] [blame] | 217 | static struct acpi_driver apple_bl_driver = { |
| 218 | .name = "Apple backlight", |
| 219 | .ids = apple_bl_ids, |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 220 | .ops = { |
Matthew Garrett | 39b3dee | 2011-03-22 16:30:28 -0700 | [diff] [blame] | 221 | .add = apple_bl_add, |
| 222 | .remove = apple_bl_remove, |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 223 | }, |
| 224 | }; |
| 225 | |
Seth Forshee | 83e72dd | 2012-03-16 14:41:21 -0500 | [diff] [blame] | 226 | static atomic_t apple_bl_registered = ATOMIC_INIT(0); |
| 227 | |
| 228 | int apple_bl_register(void) |
| 229 | { |
| 230 | if (atomic_xchg(&apple_bl_registered, 1) == 0) |
| 231 | return acpi_bus_register_driver(&apple_bl_driver); |
| 232 | |
| 233 | return 0; |
| 234 | } |
| 235 | EXPORT_SYMBOL_GPL(apple_bl_register); |
| 236 | |
| 237 | void apple_bl_unregister(void) |
| 238 | { |
| 239 | if (atomic_xchg(&apple_bl_registered, 0) == 1) |
| 240 | acpi_bus_unregister_driver(&apple_bl_driver); |
| 241 | } |
| 242 | EXPORT_SYMBOL_GPL(apple_bl_unregister); |
| 243 | |
Matthew Garrett | 39b3dee | 2011-03-22 16:30:28 -0700 | [diff] [blame] | 244 | static int __init apple_bl_init(void) |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 245 | { |
Seth Forshee | 83e72dd | 2012-03-16 14:41:21 -0500 | [diff] [blame] | 246 | return apple_bl_register(); |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 247 | } |
| 248 | |
Matthew Garrett | 39b3dee | 2011-03-22 16:30:28 -0700 | [diff] [blame] | 249 | static void __exit apple_bl_exit(void) |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 250 | { |
Seth Forshee | 83e72dd | 2012-03-16 14:41:21 -0500 | [diff] [blame] | 251 | apple_bl_unregister(); |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 252 | } |
| 253 | |
Matthew Garrett | 39b3dee | 2011-03-22 16:30:28 -0700 | [diff] [blame] | 254 | module_init(apple_bl_init); |
| 255 | module_exit(apple_bl_exit); |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 256 | |
| 257 | MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>"); |
Matthew Garrett | 39b3dee | 2011-03-22 16:30:28 -0700 | [diff] [blame] | 258 | MODULE_DESCRIPTION("Apple Backlight Driver"); |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 259 | MODULE_LICENSE("GPL"); |
Matthew Garrett | 39b3dee | 2011-03-22 16:30:28 -0700 | [diff] [blame] | 260 | MODULE_DEVICE_TABLE(acpi, apple_bl_ids); |
| 261 | MODULE_ALIAS("mbp_nvidia_bl"); |