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 | |
Jingoo Han | 7b12c1b | 2012-05-29 15:07:16 -0700 | [diff] [blame] | 19 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 20 | |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 21 | #include <linux/module.h> |
| 22 | #include <linux/kernel.h> |
| 23 | #include <linux/init.h> |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 24 | #include <linux/backlight.h> |
| 25 | #include <linux/err.h> |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 26 | #include <linux/io.h> |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 27 | #include <linux/pci.h> |
| 28 | #include <linux/acpi.h> |
Seth Forshee | 83e72dd | 2012-03-16 14:41:21 -0500 | [diff] [blame] | 29 | #include <linux/atomic.h> |
H Hartley Sweeten | 1615d210 | 2012-05-29 15:07:14 -0700 | [diff] [blame] | 30 | #include <linux/apple_bl.h> |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 31 | |
Matthew Garrett | 39b3dee | 2011-03-22 16:30:28 -0700 | [diff] [blame] | 32 | static struct backlight_device *apple_backlight_device; |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 33 | |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 34 | struct hw_data { |
Mario Schwalbe | c78a628 | 2009-01-11 00:11:34 +0000 | [diff] [blame] | 35 | /* I/O resource to allocate. */ |
| 36 | unsigned long iostart; |
| 37 | unsigned long iolen; |
| 38 | /* Backlight operations structure. */ |
Emese Revfy | 9905a43 | 2009-12-14 00:58:57 +0100 | [diff] [blame] | 39 | const struct backlight_ops backlight_ops; |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 40 | void (*set_brightness)(int); |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 41 | }; |
| 42 | |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 43 | static const struct hw_data *hw_data; |
| 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) |
Jingoo Han | 7b12c1b | 2012-05-29 15:07:16 -0700 | [diff] [blame] | 64 | pr_debug("setting brightness to %d\n", intensity); |
Mario Schwalbe | 1a468ba | 2009-01-11 00:19:31 +0000 | [diff] [blame] | 65 | |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 66 | intel_chipset_set_brightness(intensity); |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 67 | return 0; |
| 68 | } |
| 69 | |
Mario Schwalbe | c78a628 | 2009-01-11 00:11:34 +0000 | [diff] [blame] | 70 | static int intel_chipset_get_intensity(struct backlight_device *bd) |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 71 | { |
Mario Schwalbe | 1a468ba | 2009-01-11 00:19:31 +0000 | [diff] [blame] | 72 | int intensity; |
| 73 | |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 74 | outb(0x03, 0xb3); |
| 75 | outb(0xbf, 0xb2); |
Mario Schwalbe | 1a468ba | 2009-01-11 00:19:31 +0000 | [diff] [blame] | 76 | intensity = inb(0xb3) >> 4; |
| 77 | |
| 78 | if (debug) |
Jingoo Han | 7b12c1b | 2012-05-29 15:07:16 -0700 | [diff] [blame] | 79 | pr_debug("read brightness of %d\n", intensity); |
Mario Schwalbe | 1a468ba | 2009-01-11 00:19:31 +0000 | [diff] [blame] | 80 | |
| 81 | return intensity; |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 82 | } |
| 83 | |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 84 | static const struct hw_data intel_chipset_data = { |
Mario Schwalbe | c78a628 | 2009-01-11 00:11:34 +0000 | [diff] [blame] | 85 | .iostart = 0xb2, |
| 86 | .iolen = 2, |
| 87 | .backlight_ops = { |
| 88 | .options = BL_CORE_SUSPENDRESUME, |
| 89 | .get_brightness = intel_chipset_get_intensity, |
| 90 | .update_status = intel_chipset_send_intensity, |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 91 | }, |
| 92 | .set_brightness = intel_chipset_set_brightness, |
Mario Schwalbe | c78a628 | 2009-01-11 00:11:34 +0000 | [diff] [blame] | 93 | }; |
| 94 | |
| 95 | /* |
Matthew Garrett | 39b3dee | 2011-03-22 16:30:28 -0700 | [diff] [blame] | 96 | * Implementation for machines with Nvidia chipset. |
Mario Schwalbe | c78a628 | 2009-01-11 00:11:34 +0000 | [diff] [blame] | 97 | */ |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 98 | static void nvidia_chipset_set_brightness(int intensity) |
| 99 | { |
| 100 | outb(0x04 | (intensity << 4), 0x52f); |
| 101 | outb(0xbf, 0x52e); |
| 102 | } |
| 103 | |
Mario Schwalbe | c78a628 | 2009-01-11 00:11:34 +0000 | [diff] [blame] | 104 | static int nvidia_chipset_send_intensity(struct backlight_device *bd) |
| 105 | { |
| 106 | int intensity = bd->props.brightness; |
| 107 | |
Mario Schwalbe | 1a468ba | 2009-01-11 00:19:31 +0000 | [diff] [blame] | 108 | if (debug) |
Jingoo Han | 7b12c1b | 2012-05-29 15:07:16 -0700 | [diff] [blame] | 109 | pr_debug("setting brightness to %d\n", intensity); |
Mario Schwalbe | 1a468ba | 2009-01-11 00:19:31 +0000 | [diff] [blame] | 110 | |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 111 | nvidia_chipset_set_brightness(intensity); |
Mario Schwalbe | c78a628 | 2009-01-11 00:11:34 +0000 | [diff] [blame] | 112 | return 0; |
| 113 | } |
| 114 | |
| 115 | static int nvidia_chipset_get_intensity(struct backlight_device *bd) |
| 116 | { |
Mario Schwalbe | 1a468ba | 2009-01-11 00:19:31 +0000 | [diff] [blame] | 117 | int intensity; |
| 118 | |
Mario Schwalbe | c78a628 | 2009-01-11 00:11:34 +0000 | [diff] [blame] | 119 | outb(0x03, 0x52f); |
| 120 | outb(0xbf, 0x52e); |
Mario Schwalbe | 1a468ba | 2009-01-11 00:19:31 +0000 | [diff] [blame] | 121 | intensity = inb(0x52f) >> 4; |
| 122 | |
| 123 | if (debug) |
Jingoo Han | 7b12c1b | 2012-05-29 15:07:16 -0700 | [diff] [blame] | 124 | pr_debug("read brightness of %d\n", intensity); |
Mario Schwalbe | 1a468ba | 2009-01-11 00:19:31 +0000 | [diff] [blame] | 125 | |
| 126 | return intensity; |
Mario Schwalbe | c78a628 | 2009-01-11 00:11:34 +0000 | [diff] [blame] | 127 | } |
| 128 | |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 129 | static const struct hw_data nvidia_chipset_data = { |
Mario Schwalbe | c78a628 | 2009-01-11 00:11:34 +0000 | [diff] [blame] | 130 | .iostart = 0x52e, |
| 131 | .iolen = 2, |
| 132 | .backlight_ops = { |
| 133 | .options = BL_CORE_SUSPENDRESUME, |
| 134 | .get_brightness = nvidia_chipset_get_intensity, |
| 135 | .update_status = nvidia_chipset_send_intensity |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 136 | }, |
| 137 | .set_brightness = nvidia_chipset_set_brightness, |
Mario Schwalbe | c78a628 | 2009-01-11 00:11:34 +0000 | [diff] [blame] | 138 | }; |
| 139 | |
Matthew Garrett | 39b3dee | 2011-03-22 16:30:28 -0700 | [diff] [blame] | 140 | static int __devinit apple_bl_add(struct acpi_device *dev) |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 141 | { |
Matthew Garrett | a19a6ee | 2010-02-17 16:39:44 -0500 | [diff] [blame] | 142 | struct backlight_properties props; |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 143 | struct pci_dev *host; |
Matthew Garrett | 99fd28e | 2011-03-22 16:30:27 -0700 | [diff] [blame] | 144 | int intensity; |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 145 | |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 146 | host = pci_get_bus_and_slot(0, 0); |
| 147 | |
| 148 | if (!host) { |
Jingoo Han | 7b12c1b | 2012-05-29 15:07:16 -0700 | [diff] [blame] | 149 | pr_err("unable to find PCI host\n"); |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 150 | return -ENODEV; |
| 151 | } |
| 152 | |
| 153 | if (host->vendor == PCI_VENDOR_ID_INTEL) |
| 154 | hw_data = &intel_chipset_data; |
| 155 | else if (host->vendor == PCI_VENDOR_ID_NVIDIA) |
| 156 | hw_data = &nvidia_chipset_data; |
| 157 | |
| 158 | pci_dev_put(host); |
| 159 | |
| 160 | if (!hw_data) { |
Jingoo Han | 7b12c1b | 2012-05-29 15:07:16 -0700 | [diff] [blame] | 161 | pr_err("unknown hardware\n"); |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 162 | return -ENODEV; |
| 163 | } |
| 164 | |
Matthew Garrett | 99fd28e | 2011-03-22 16:30:27 -0700 | [diff] [blame] | 165 | /* Check that the hardware responds - this may not work under EFI */ |
| 166 | |
| 167 | intensity = hw_data->backlight_ops.get_brightness(NULL); |
| 168 | |
| 169 | if (!intensity) { |
| 170 | hw_data->set_brightness(1); |
| 171 | if (!hw_data->backlight_ops.get_brightness(NULL)) |
| 172 | return -ENODEV; |
| 173 | |
| 174 | hw_data->set_brightness(0); |
| 175 | } |
| 176 | |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 177 | if (!request_region(hw_data->iostart, hw_data->iolen, |
Matthew Garrett | 39b3dee | 2011-03-22 16:30:28 -0700 | [diff] [blame] | 178 | "Apple backlight")) |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 179 | return -ENXIO; |
| 180 | |
Matthew Garrett | a19a6ee | 2010-02-17 16:39:44 -0500 | [diff] [blame] | 181 | memset(&props, 0, sizeof(struct backlight_properties)); |
Matthew Garrett | bb7ca74 | 2011-03-22 16:30:21 -0700 | [diff] [blame] | 182 | props.type = BACKLIGHT_PLATFORM; |
Matthew Garrett | a19a6ee | 2010-02-17 16:39:44 -0500 | [diff] [blame] | 183 | props.max_brightness = 15; |
Matthew Garrett | 39b3dee | 2011-03-22 16:30:28 -0700 | [diff] [blame] | 184 | apple_backlight_device = backlight_device_register("apple_backlight", |
| 185 | NULL, NULL, &hw_data->backlight_ops, &props); |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 186 | |
Matthew Garrett | 39b3dee | 2011-03-22 16:30:28 -0700 | [diff] [blame] | 187 | if (IS_ERR(apple_backlight_device)) { |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 188 | release_region(hw_data->iostart, hw_data->iolen); |
Matthew Garrett | 39b3dee | 2011-03-22 16:30:28 -0700 | [diff] [blame] | 189 | return PTR_ERR(apple_backlight_device); |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 190 | } |
| 191 | |
Matthew Garrett | 39b3dee | 2011-03-22 16:30:28 -0700 | [diff] [blame] | 192 | apple_backlight_device->props.brightness = |
| 193 | hw_data->backlight_ops.get_brightness(apple_backlight_device); |
| 194 | backlight_update_status(apple_backlight_device); |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 195 | |
| 196 | return 0; |
| 197 | } |
| 198 | |
Matthew Garrett | 39b3dee | 2011-03-22 16:30:28 -0700 | [diff] [blame] | 199 | static int __devexit apple_bl_remove(struct acpi_device *dev, int type) |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 200 | { |
Matthew Garrett | 39b3dee | 2011-03-22 16:30:28 -0700 | [diff] [blame] | 201 | backlight_device_unregister(apple_backlight_device); |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 202 | |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 203 | release_region(hw_data->iostart, hw_data->iolen); |
| 204 | hw_data = NULL; |
| 205 | return 0; |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 206 | } |
| 207 | |
Matthew Garrett | 39b3dee | 2011-03-22 16:30:28 -0700 | [diff] [blame] | 208 | static const struct acpi_device_id apple_bl_ids[] = { |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 209 | {"APP0002", 0}, |
| 210 | {"", 0}, |
| 211 | }; |
| 212 | |
Matthew Garrett | 39b3dee | 2011-03-22 16:30:28 -0700 | [diff] [blame] | 213 | static struct acpi_driver apple_bl_driver = { |
| 214 | .name = "Apple backlight", |
| 215 | .ids = apple_bl_ids, |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 216 | .ops = { |
Matthew Garrett | 39b3dee | 2011-03-22 16:30:28 -0700 | [diff] [blame] | 217 | .add = apple_bl_add, |
| 218 | .remove = apple_bl_remove, |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 219 | }, |
| 220 | }; |
| 221 | |
Seth Forshee | 83e72dd | 2012-03-16 14:41:21 -0500 | [diff] [blame] | 222 | static atomic_t apple_bl_registered = ATOMIC_INIT(0); |
| 223 | |
| 224 | int apple_bl_register(void) |
| 225 | { |
| 226 | if (atomic_xchg(&apple_bl_registered, 1) == 0) |
| 227 | return acpi_bus_register_driver(&apple_bl_driver); |
| 228 | |
| 229 | return 0; |
| 230 | } |
| 231 | EXPORT_SYMBOL_GPL(apple_bl_register); |
| 232 | |
| 233 | void apple_bl_unregister(void) |
| 234 | { |
| 235 | if (atomic_xchg(&apple_bl_registered, 0) == 1) |
| 236 | acpi_bus_unregister_driver(&apple_bl_driver); |
| 237 | } |
| 238 | EXPORT_SYMBOL_GPL(apple_bl_unregister); |
| 239 | |
Matthew Garrett | 39b3dee | 2011-03-22 16:30:28 -0700 | [diff] [blame] | 240 | static int __init apple_bl_init(void) |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 241 | { |
Seth Forshee | 83e72dd | 2012-03-16 14:41:21 -0500 | [diff] [blame] | 242 | return apple_bl_register(); |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 243 | } |
| 244 | |
Matthew Garrett | 39b3dee | 2011-03-22 16:30:28 -0700 | [diff] [blame] | 245 | static void __exit apple_bl_exit(void) |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 246 | { |
Seth Forshee | 83e72dd | 2012-03-16 14:41:21 -0500 | [diff] [blame] | 247 | apple_bl_unregister(); |
Matthew Garrett | 23a9847 | 2011-03-22 16:30:26 -0700 | [diff] [blame] | 248 | } |
| 249 | |
Matthew Garrett | 39b3dee | 2011-03-22 16:30:28 -0700 | [diff] [blame] | 250 | module_init(apple_bl_init); |
| 251 | module_exit(apple_bl_exit); |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 252 | |
| 253 | MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>"); |
Matthew Garrett | 39b3dee | 2011-03-22 16:30:28 -0700 | [diff] [blame] | 254 | MODULE_DESCRIPTION("Apple Backlight Driver"); |
Matthew Garrett | 7be35c7 | 2008-06-09 21:56:16 +0100 | [diff] [blame] | 255 | MODULE_LICENSE("GPL"); |
Matthew Garrett | 39b3dee | 2011-03-22 16:30:28 -0700 | [diff] [blame] | 256 | MODULE_DEVICE_TABLE(acpi, apple_bl_ids); |
| 257 | MODULE_ALIAS("mbp_nvidia_bl"); |