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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Felipe Contreras21fcb342013-08-01 18:43:59 -05002 * video.c - ACPI Video Driver
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 *
4 * Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
5 * Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
Thomas Tuttlef4715182006-12-19 12:56:14 -08006 * Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 *
8 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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 as published by
12 * the Free Software Foundation; either version 2 of the License, or (at
13 * your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License along
21 * with this program; if not, write to the Free Software Foundation, Inc.,
22 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
23 *
24 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
25 */
26
27#include <linux/kernel.h>
28#include <linux/module.h>
29#include <linux/init.h>
30#include <linux/types.h>
31#include <linux/list.h>
Dmitry Torokhovbbac81f2007-11-05 11:43:32 -050032#include <linux/mutex.h>
Luming Yue9dab192007-08-20 18:23:53 +080033#include <linux/input.h>
Yu Luming2f3d0002006-11-11 02:40:34 +080034#include <linux/backlight.h>
Zhang Rui702ed512008-01-17 15:51:22 +080035#include <linux/thermal.h>
Zhang Rui935e5f22008-12-11 16:24:52 -050036#include <linux/sort.h>
Matthew Garrett74a365b2009-03-19 21:35:39 +000037#include <linux/pci.h>
38#include <linux/pci_ids.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090039#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#include <asm/uaccess.h>
Len Browneb27cae2009-07-06 23:40:19 -040041#include <linux/dmi.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070042#include <acpi/acpi_bus.h>
43#include <acpi/acpi_drivers.h>
Rafael J. Wysockiac7729d2010-04-05 01:43:51 +020044#include <linux/suspend.h>
Matthew Garrette92a7162010-01-12 14:17:03 -050045#include <acpi/video.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
Rafael J. Wysocki8c5bd7a2013-07-18 02:08:06 +020047#include "internal.h"
48
Len Browna192a952009-07-28 16:45:54 -040049#define PREFIX "ACPI: "
50
Linus Torvalds1da177e2005-04-16 15:20:36 -070051#define ACPI_VIDEO_BUS_NAME "Video Bus"
52#define ACPI_VIDEO_DEVICE_NAME "Video Device"
53#define ACPI_VIDEO_NOTIFY_SWITCH 0x80
54#define ACPI_VIDEO_NOTIFY_PROBE 0x81
55#define ACPI_VIDEO_NOTIFY_CYCLE 0x82
56#define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83
57#define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84
58
Thomas Tuttlef4715182006-12-19 12:56:14 -080059#define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x85
60#define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x86
61#define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x87
62#define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x88
63#define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x89
Linus Torvalds1da177e2005-04-16 15:20:36 -070064
Yu Luming2f3d0002006-11-11 02:40:34 +080065#define MAX_NAME_LEN 20
Linus Torvalds1da177e2005-04-16 15:20:36 -070066
Linus Torvalds1da177e2005-04-16 15:20:36 -070067#define _COMPONENT ACPI_VIDEO_COMPONENT
Len Brownf52fd662007-02-12 22:42:12 -050068ACPI_MODULE_NAME("video");
Linus Torvalds1da177e2005-04-16 15:20:36 -070069
Len Brownf52fd662007-02-12 22:42:12 -050070MODULE_AUTHOR("Bruno Ducrot");
Len Brown7cda93e2007-02-12 23:50:02 -050071MODULE_DESCRIPTION("ACPI Video Driver");
Linus Torvalds1da177e2005-04-16 15:20:36 -070072MODULE_LICENSE("GPL");
73
Rusty Russell90ab5ee2012-01-13 09:32:20 +103074static bool brightness_switch_enabled = 1;
Zhang Rui8a681a42008-01-25 14:47:49 +080075module_param(brightness_switch_enabled, bool, 0644);
76
Zhang Ruic504f8c2009-12-30 15:59:23 +080077/*
78 * By default, we don't allow duplicate ACPI video bus devices
79 * under the same VGA controller
80 */
Rusty Russell90ab5ee2012-01-13 09:32:20 +103081static bool allow_duplicates;
Zhang Ruic504f8c2009-12-30 15:59:23 +080082module_param(allow_duplicates, bool, 0644);
83
Zhang Rui99fd1892010-12-06 15:04:27 +080084/*
Aaron Lufbc9fe12013-10-11 21:27:45 +080085 * For Windows 8 systems: if set ture and the GPU driver has
86 * registered a backlight interface, skip registering ACPI video's.
87 */
88static bool use_native_backlight = false;
89module_param(use_native_backlight, bool, 0644);
90
Felipe Contreras915ea7e2013-08-03 22:12:50 +020091static int register_count;
Aaron Lu67b662e2013-10-11 21:27:44 +080092static struct mutex video_list_lock;
93static struct list_head video_bus_head;
Len Brown4be44fc2005-08-05 00:44:28 -040094static int acpi_video_bus_add(struct acpi_device *device);
Rafael J. Wysocki51fac832013-01-24 00:24:48 +010095static int acpi_video_bus_remove(struct acpi_device *device);
Bjorn Helgaas70155582009-04-07 15:37:11 +000096static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
Linus Torvalds1da177e2005-04-16 15:20:36 -070097
Thomas Renninger1ba90e32007-07-23 14:44:41 +020098static const struct acpi_device_id video_device_ids[] = {
99 {ACPI_VIDEO_HID, 0},
100 {"", 0},
101};
102MODULE_DEVICE_TABLE(acpi, video_device_ids);
103
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104static struct acpi_driver acpi_video_bus = {
Len Brownc2b67052007-02-12 23:33:40 -0500105 .name = "video",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 .class = ACPI_VIDEO_CLASS,
Thomas Renninger1ba90e32007-07-23 14:44:41 +0200107 .ids = video_device_ids,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 .ops = {
109 .add = acpi_video_bus_add,
110 .remove = acpi_video_bus_remove,
Bjorn Helgaas70155582009-04-07 15:37:11 +0000111 .notify = acpi_video_bus_notify,
Len Brown4be44fc2005-08-05 00:44:28 -0400112 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113};
114
115struct acpi_video_bus_flags {
Len Brown4be44fc2005-08-05 00:44:28 -0400116 u8 multihead:1; /* can switch video heads */
117 u8 rom:1; /* can retrieve a video rom */
118 u8 post:1; /* can configure the head to */
119 u8 reserved:5;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120};
121
122struct acpi_video_bus_cap {
Felipe Contreras21fcb342013-08-01 18:43:59 -0500123 u8 _DOS:1; /* Enable/Disable output switching */
124 u8 _DOD:1; /* Enumerate all devices attached to display adapter */
125 u8 _ROM:1; /* Get ROM Data */
126 u8 _GPD:1; /* Get POST Device */
127 u8 _SPD:1; /* Set POST Device */
128 u8 _VPO:1; /* Video POST Options */
Len Brown4be44fc2005-08-05 00:44:28 -0400129 u8 reserved:2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130};
131
Len Brown4be44fc2005-08-05 00:44:28 -0400132struct acpi_video_device_attrib {
133 u32 display_index:4; /* A zero-based instance of the Display */
Felipe Contreras21fcb342013-08-01 18:43:59 -0500134 u32 display_port_attachment:4; /* This field differentiates the display type */
135 u32 display_type:4; /* Describe the specific type in use */
136 u32 vendor_specific:4; /* Chipset Vendor Specific */
137 u32 bios_can_detect:1; /* BIOS can detect the device */
138 u32 depend_on_vga:1; /* Non-VGA output device whose power is related to
Len Brown4be44fc2005-08-05 00:44:28 -0400139 the VGA device. */
Felipe Contreras21fcb342013-08-01 18:43:59 -0500140 u32 pipe_id:3; /* For VGA multiple-head devices. */
141 u32 reserved:10; /* Must be 0 */
142 u32 device_id_scheme:1; /* Device ID Scheme */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143};
144
145struct acpi_video_enumerated_device {
146 union {
147 u32 int_val;
Len Brown4be44fc2005-08-05 00:44:28 -0400148 struct acpi_video_device_attrib attrib;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 } value;
150 struct acpi_video_device *bind_info;
151};
152
153struct acpi_video_bus {
Patrick Mochele6afa0d2006-05-19 16:54:40 -0400154 struct acpi_device *device;
Len Brown4be44fc2005-08-05 00:44:28 -0400155 u8 dos_setting;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 struct acpi_video_enumerated_device *attached_array;
Len Brown4be44fc2005-08-05 00:44:28 -0400157 u8 attached_count;
158 struct acpi_video_bus_cap cap;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 struct acpi_video_bus_flags flags;
Len Brown4be44fc2005-08-05 00:44:28 -0400160 struct list_head video_device_list;
Dmitry Torokhovbbac81f2007-11-05 11:43:32 -0500161 struct mutex device_list_lock; /* protects video_device_list */
Aaron Lu67b662e2013-10-11 21:27:44 +0800162 struct list_head entry;
Luming Yue9dab192007-08-20 18:23:53 +0800163 struct input_dev *input;
164 char phys[32]; /* for input device */
Rafael J. Wysockiac7729d2010-04-05 01:43:51 +0200165 struct notifier_block pm_nb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166};
167
168struct acpi_video_device_flags {
Len Brown4be44fc2005-08-05 00:44:28 -0400169 u8 crt:1;
170 u8 lcd:1;
171 u8 tvout:1;
Rui Zhang82cae992007-01-03 23:40:53 -0500172 u8 dvi:1;
Len Brown4be44fc2005-08-05 00:44:28 -0400173 u8 bios:1;
174 u8 unknown:1;
Aaron Lu91e13aa2013-04-25 02:47:49 +0000175 u8 notify:1;
176 u8 reserved:1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177};
178
179struct acpi_video_device_cap {
Felipe Contreras21fcb342013-08-01 18:43:59 -0500180 u8 _ADR:1; /* Return the unique ID */
181 u8 _BCL:1; /* Query list of brightness control levels supported */
182 u8 _BCM:1; /* Set the brightness level */
Yu Luming2f3d0002006-11-11 02:40:34 +0800183 u8 _BQC:1; /* Get current brightness level */
Zhang Ruic60d6382009-03-18 16:27:18 +0800184 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
Felipe Contreras21fcb342013-08-01 18:43:59 -0500185 u8 _DDC:1; /* Return the EDID for this device */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186};
187
Zhang Ruid32f6942009-03-18 16:27:12 +0800188struct acpi_video_brightness_flags {
189 u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
Felipe Contreras21fcb342013-08-01 18:43:59 -0500190 u8 _BCL_reversed:1; /* _BCL package is in a reversed order */
Zhang Rui1a7c6182009-03-18 16:27:16 +0800191 u8 _BQC_use_index:1; /* _BQC returns an index value */
Zhang Ruid32f6942009-03-18 16:27:12 +0800192};
193
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194struct acpi_video_device_brightness {
Len Brown4be44fc2005-08-05 00:44:28 -0400195 int curr;
196 int count;
197 int *levels;
Zhang Ruid32f6942009-03-18 16:27:12 +0800198 struct acpi_video_brightness_flags flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199};
200
201struct acpi_video_device {
Len Brown4be44fc2005-08-05 00:44:28 -0400202 unsigned long device_id;
203 struct acpi_video_device_flags flags;
204 struct acpi_video_device_cap cap;
205 struct list_head entry;
206 struct acpi_video_bus *video;
207 struct acpi_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 struct acpi_video_device_brightness *brightness;
Yu Luming2f3d0002006-11-11 02:40:34 +0800209 struct backlight_device *backlight;
Dmitry Torokhov4a703a82009-08-29 23:03:16 -0400210 struct thermal_cooling_device *cooling_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211};
212
Jan Engelhardtb7171ae2009-01-12 00:08:19 +0100213static const char device_decode[][30] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 "motherboard VGA device",
215 "PCI VGA device",
216 "AGP VGA device",
217 "UNKNOWN",
218};
219
Len Brown4be44fc2005-08-05 00:44:28 -0400220static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
221static void acpi_video_device_rebind(struct acpi_video_bus *video);
222static void acpi_video_device_bind(struct acpi_video_bus *video,
223 struct acpi_video_device *device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224static int acpi_video_device_enumerate(struct acpi_video_bus *video);
Yu Luming2f3d0002006-11-11 02:40:34 +0800225static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
226 int level);
227static int acpi_video_device_lcd_get_level_current(
228 struct acpi_video_device *device,
Danny Baumanna89803d2013-03-19 16:22:50 +0000229 unsigned long long *level, bool raw);
Len Brown4be44fc2005-08-05 00:44:28 -0400230static int acpi_video_get_next_level(struct acpi_video_device *device,
231 u32 level_current, u32 event);
Zhang Ruic8890f92009-03-18 16:27:08 +0800232static int acpi_video_switch_brightness(struct acpi_video_device *device,
Len Brown4be44fc2005-08-05 00:44:28 -0400233 int event);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234
Aaron Lufbc9fe12013-10-11 21:27:45 +0800235static bool acpi_video_verify_backlight_support(void)
236{
237 if (acpi_osi_is_win8() && use_native_backlight &&
238 backlight_device_registered(BACKLIGHT_RAW))
239 return false;
240 return acpi_video_backlight_support();
241}
242
Felipe Contreras21fcb342013-08-01 18:43:59 -0500243/* backlight device sysfs support */
Yu Luming2f3d0002006-11-11 02:40:34 +0800244static int acpi_video_get_brightness(struct backlight_device *bd)
245{
Matthew Wilcox27663c52008-10-10 02:22:59 -0400246 unsigned long long cur_level;
Matthew Garrett38531e62007-12-26 02:03:26 +0000247 int i;
Felipe Contreras7c364e72013-08-03 22:15:21 +0200248 struct acpi_video_device *vd = bl_get_data(bd);
Zhang Ruic8890f92009-03-18 16:27:08 +0800249
Danny Baumanna89803d2013-03-19 16:22:50 +0000250 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
Zhang Ruic8890f92009-03-18 16:27:08 +0800251 return -EINVAL;
Matthew Garrett38531e62007-12-26 02:03:26 +0000252 for (i = 2; i < vd->brightness->count; i++) {
253 if (vd->brightness->levels[i] == cur_level)
Felipe Contreras21fcb342013-08-01 18:43:59 -0500254 /*
255 * The first two entries are special - see page 575
256 * of the ACPI spec 3.0
257 */
Felipe Contreras915ea7e2013-08-03 22:12:50 +0200258 return i - 2;
Matthew Garrett38531e62007-12-26 02:03:26 +0000259 }
260 return 0;
Yu Luming2f3d0002006-11-11 02:40:34 +0800261}
262
263static int acpi_video_set_brightness(struct backlight_device *bd)
264{
Zhang Rui24450c72009-03-18 16:27:10 +0800265 int request_level = bd->props.brightness + 2;
Felipe Contreras7c364e72013-08-03 22:15:21 +0200266 struct acpi_video_device *vd = bl_get_data(bd);
Zhang Rui24450c72009-03-18 16:27:10 +0800267
268 return acpi_video_device_lcd_set_level(vd,
269 vd->brightness->levels[request_level]);
Yu Luming2f3d0002006-11-11 02:40:34 +0800270}
271
Lionel Debrouxacc24722010-11-16 14:14:02 +0100272static const struct backlight_ops acpi_backlight_ops = {
Richard Purdie599a52d2007-02-10 23:07:48 +0000273 .get_brightness = acpi_video_get_brightness,
274 .update_status = acpi_video_set_brightness,
275};
276
Zhang Rui702ed512008-01-17 15:51:22 +0800277/* thermal cooling device callbacks */
Dmitry Torokhov4a703a82009-08-29 23:03:16 -0400278static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
Matthew Garrett6503e5d2008-11-27 17:48:13 +0000279 long *state)
Zhang Rui702ed512008-01-17 15:51:22 +0800280{
Dmitry Torokhov4a703a82009-08-29 23:03:16 -0400281 struct acpi_device *device = cooling_dev->devdata;
Zhang Rui702ed512008-01-17 15:51:22 +0800282 struct acpi_video_device *video = acpi_driver_data(device);
283
Matthew Garrett6503e5d2008-11-27 17:48:13 +0000284 *state = video->brightness->count - 3;
285 return 0;
Zhang Rui702ed512008-01-17 15:51:22 +0800286}
287
Dmitry Torokhov4a703a82009-08-29 23:03:16 -0400288static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
Matthew Garrett6503e5d2008-11-27 17:48:13 +0000289 long *state)
Zhang Rui702ed512008-01-17 15:51:22 +0800290{
Dmitry Torokhov4a703a82009-08-29 23:03:16 -0400291 struct acpi_device *device = cooling_dev->devdata;
Zhang Rui702ed512008-01-17 15:51:22 +0800292 struct acpi_video_device *video = acpi_driver_data(device);
Matthew Wilcox27663c52008-10-10 02:22:59 -0400293 unsigned long long level;
Matthew Garrett6503e5d2008-11-27 17:48:13 +0000294 int offset;
Zhang Rui702ed512008-01-17 15:51:22 +0800295
Danny Baumanna89803d2013-03-19 16:22:50 +0000296 if (acpi_video_device_lcd_get_level_current(video, &level, false))
Zhang Ruic8890f92009-03-18 16:27:08 +0800297 return -EINVAL;
Matthew Garrett6503e5d2008-11-27 17:48:13 +0000298 for (offset = 2; offset < video->brightness->count; offset++)
299 if (level == video->brightness->levels[offset]) {
300 *state = video->brightness->count - offset - 1;
301 return 0;
302 }
Zhang Rui702ed512008-01-17 15:51:22 +0800303
304 return -EINVAL;
305}
306
307static int
Dmitry Torokhov4a703a82009-08-29 23:03:16 -0400308video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
Zhang Rui702ed512008-01-17 15:51:22 +0800309{
Dmitry Torokhov4a703a82009-08-29 23:03:16 -0400310 struct acpi_device *device = cooling_dev->devdata;
Zhang Rui702ed512008-01-17 15:51:22 +0800311 struct acpi_video_device *video = acpi_driver_data(device);
312 int level;
313
Felipe Contreras915ea7e2013-08-03 22:12:50 +0200314 if (state >= video->brightness->count - 2)
Zhang Rui702ed512008-01-17 15:51:22 +0800315 return -EINVAL;
316
317 state = video->brightness->count - state;
Felipe Contreras915ea7e2013-08-03 22:12:50 +0200318 level = video->brightness->levels[state - 1];
Zhang Rui702ed512008-01-17 15:51:22 +0800319 return acpi_video_device_lcd_set_level(video, level);
320}
321
Vasiliy Kulikov9c8b04b2011-06-25 21:07:52 +0400322static const struct thermal_cooling_device_ops video_cooling_ops = {
Zhang Rui702ed512008-01-17 15:51:22 +0800323 .get_max_state = video_get_max_state,
324 .get_cur_state = video_get_cur_state,
325 .set_cur_state = video_set_cur_state,
326};
327
Felipe Contreras21fcb342013-08-01 18:43:59 -0500328/*
329 * --------------------------------------------------------------------------
330 * Video Management
331 * --------------------------------------------------------------------------
332 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334static int
Len Brown4be44fc2005-08-05 00:44:28 -0400335acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
336 union acpi_object **levels)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337{
Len Brown4be44fc2005-08-05 00:44:28 -0400338 int status;
339 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
340 union acpi_object *obj;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342
343 *levels = NULL;
344
Patrick Mochel90130262006-05-19 16:54:48 -0400345 status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 if (!ACPI_SUCCESS(status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400347 return status;
Len Brown4be44fc2005-08-05 00:44:28 -0400348 obj = (union acpi_object *)buffer.pointer;
Adrian Bunk6665bda2006-03-11 10:12:00 -0500349 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
Len Brown64684632006-06-26 23:41:38 -0400350 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 status = -EFAULT;
352 goto err;
353 }
354
355 *levels = obj;
356
Patrick Mocheld550d982006-06-27 00:41:40 -0400357 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358
Felipe Contreras915ea7e2013-08-03 22:12:50 +0200359err:
Jesper Juhl6044ec82005-11-07 01:01:32 -0800360 kfree(buffer.pointer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361
Patrick Mocheld550d982006-06-27 00:41:40 -0400362 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363}
364
365static int
Len Brown4be44fc2005-08-05 00:44:28 -0400366acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367{
Zhang Rui24450c72009-03-18 16:27:10 +0800368 int status;
Zhang Rui9e6dada2008-12-31 10:58:48 +0800369 int state;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370
Jiang Liu0db98202013-06-29 00:24:39 +0800371 status = acpi_execute_simple_method(device->dev->handle,
372 "_BCM", level);
Zhang Rui24450c72009-03-18 16:27:10 +0800373 if (ACPI_FAILURE(status)) {
374 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
375 return -EIO;
376 }
377
Alexey Starikovskiy4500ca82007-09-03 16:29:58 +0400378 device->brightness->curr = level;
Zhang Rui9e6dada2008-12-31 10:58:48 +0800379 for (state = 2; state < device->brightness->count; state++)
Zhang Rui24450c72009-03-18 16:27:10 +0800380 if (level == device->brightness->levels[state]) {
Zhang Rui1a7c6182009-03-18 16:27:16 +0800381 if (device->backlight)
382 device->backlight->props.brightness = state - 2;
Zhang Rui24450c72009-03-18 16:27:10 +0800383 return 0;
384 }
Zhang Rui9e6dada2008-12-31 10:58:48 +0800385
Zhang Rui24450c72009-03-18 16:27:10 +0800386 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
387 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388}
389
Zhang Rui45cb50e2009-04-24 12:13:18 -0400390/*
391 * For some buggy _BQC methods, we need to add a constant value to
392 * the _BQC return value to get the actual current brightness level
393 */
394
395static int bqc_offset_aml_bug_workaround;
396static int __init video_set_bqc_offset(const struct dmi_system_id *d)
397{
398 bqc_offset_aml_bug_workaround = 9;
399 return 0;
400}
401
402static struct dmi_system_id video_dmi_table[] __initdata = {
403 /*
404 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
405 */
406 {
407 .callback = video_set_bqc_offset,
408 .ident = "Acer Aspire 5720",
409 .matches = {
410 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
411 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
412 },
413 },
Len Brown5afc4ab2009-05-07 21:11:56 -0400414 {
415 .callback = video_set_bqc_offset,
416 .ident = "Acer Aspire 5710Z",
417 .matches = {
418 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
419 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
420 },
421 },
Zhang Rui34ac2722009-05-26 23:35:34 -0400422 {
423 .callback = video_set_bqc_offset,
424 .ident = "eMachines E510",
425 .matches = {
426 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
427 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
428 },
429 },
Zhang Rui93bcece2009-05-19 15:08:41 -0400430 {
431 .callback = video_set_bqc_offset,
432 .ident = "Acer Aspire 5315",
433 .matches = {
434 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
435 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
436 },
437 },
Zhang Rui152a4e62009-06-22 11:31:18 +0800438 {
439 .callback = video_set_bqc_offset,
440 .ident = "Acer Aspire 7720",
441 .matches = {
442 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
443 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
444 },
445 },
Zhang Rui45cb50e2009-04-24 12:13:18 -0400446 {}
447};
448
Danny Baumann994fa632013-03-19 16:22:52 +0000449static unsigned long long
450acpi_video_bqc_value_to_level(struct acpi_video_device *device,
451 unsigned long long bqc_value)
452{
453 unsigned long long level;
454
455 if (device->brightness->flags._BQC_use_index) {
456 /*
457 * _BQC returns an index that doesn't account for
458 * the first 2 items with special meaning, so we need
459 * to compensate for that by offsetting ourselves
460 */
461 if (device->brightness->flags._BCL_reversed)
462 bqc_value = device->brightness->count - 3 - bqc_value;
463
464 level = device->brightness->levels[bqc_value + 2];
465 } else {
466 level = bqc_value;
467 }
468
469 level += bqc_offset_aml_bug_workaround;
470
471 return level;
472}
473
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474static int
Len Brown4be44fc2005-08-05 00:44:28 -0400475acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
Danny Baumanna89803d2013-03-19 16:22:50 +0000476 unsigned long long *level, bool raw)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477{
Zhang Ruic8890f92009-03-18 16:27:08 +0800478 acpi_status status = AE_OK;
Vladimir Serbinenko4e231fa2009-06-24 15:17:36 +0800479 int i;
Zhang Ruic8890f92009-03-18 16:27:08 +0800480
Zhang Ruic60d6382009-03-18 16:27:18 +0800481 if (device->cap._BQC || device->cap._BCQ) {
482 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
483
484 status = acpi_evaluate_integer(device->dev->handle, buf,
Zhang Ruic8890f92009-03-18 16:27:08 +0800485 NULL, level);
486 if (ACPI_SUCCESS(status)) {
Danny Baumanna89803d2013-03-19 16:22:50 +0000487 if (raw) {
488 /*
489 * Caller has indicated he wants the raw
490 * value returned by _BQC, so don't furtherly
491 * mess with the value.
492 */
493 return 0;
494 }
495
Danny Baumann994fa632013-03-19 16:22:52 +0000496 *level = acpi_video_bqc_value_to_level(device, *level);
Zhang Rui1a7c6182009-03-18 16:27:16 +0800497
Vladimir Serbinenko4e231fa2009-06-24 15:17:36 +0800498 for (i = 2; i < device->brightness->count; i++)
499 if (device->brightness->levels[i] == *level) {
500 device->brightness->curr = *level;
501 return 0;
Felipe Contreras915ea7e2013-08-03 22:12:50 +0200502 }
Danny Baumanna89803d2013-03-19 16:22:50 +0000503 /*
504 * BQC returned an invalid level.
505 * Stop using it.
506 */
507 ACPI_WARNING((AE_INFO,
508 "%s returned an invalid level",
509 buf));
510 device->cap._BQC = device->cap._BCQ = 0;
Zhang Ruic8890f92009-03-18 16:27:08 +0800511 } else {
Felipe Contreras21fcb342013-08-01 18:43:59 -0500512 /*
513 * Fixme:
Zhang Ruic8890f92009-03-18 16:27:08 +0800514 * should we return an error or ignore this failure?
515 * dev->brightness->curr is a cached value which stores
516 * the correct current backlight level in most cases.
517 * ACPI video backlight still works w/ buggy _BQC.
518 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
519 */
Zhang Ruic60d6382009-03-18 16:27:18 +0800520 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
521 device->cap._BQC = device->cap._BCQ = 0;
Zhang Ruic8890f92009-03-18 16:27:08 +0800522 }
523 }
524
Alexey Starikovskiy4500ca82007-09-03 16:29:58 +0400525 *level = device->brightness->curr;
Zhang Ruic8890f92009-03-18 16:27:08 +0800526 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527}
528
529static int
Len Brown4be44fc2005-08-05 00:44:28 -0400530acpi_video_device_EDID(struct acpi_video_device *device,
531 union acpi_object **edid, ssize_t length)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532{
Len Brown4be44fc2005-08-05 00:44:28 -0400533 int status;
534 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
535 union acpi_object *obj;
536 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
537 struct acpi_object_list args = { 1, &arg0 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539
540 *edid = NULL;
541
542 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400543 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544 if (length == 128)
545 arg0.integer.value = 1;
546 else if (length == 256)
547 arg0.integer.value = 2;
548 else
Patrick Mocheld550d982006-06-27 00:41:40 -0400549 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550
Patrick Mochel90130262006-05-19 16:54:48 -0400551 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400553 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200555 obj = buffer.pointer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556
557 if (obj && obj->type == ACPI_TYPE_BUFFER)
558 *edid = obj;
559 else {
Len Brown64684632006-06-26 23:41:38 -0400560 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561 status = -EFAULT;
562 kfree(obj);
563 }
564
Patrick Mocheld550d982006-06-27 00:41:40 -0400565 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566}
567
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568/* bus */
569
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570/*
571 * Arg:
Felipe Contreras21fcb342013-08-01 18:43:59 -0500572 * video : video bus device pointer
573 * bios_flag :
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 * 0. The system BIOS should NOT automatically switch(toggle)
575 * the active display output.
576 * 1. The system BIOS should automatically switch (toggle) the
Julius Volz98fb8fe2007-02-20 16:38:40 +0100577 * active display output. No switch event.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578 * 2. The _DGS value should be locked.
579 * 3. The system BIOS should not automatically switch (toggle) the
580 * active display output, but instead generate the display switch
581 * event notify code.
582 * lcd_flag :
583 * 0. The system BIOS should automatically control the brightness level
Julius Volz98fb8fe2007-02-20 16:38:40 +0100584 * of the LCD when the power changes from AC to DC
Felipe Contreras21fcb342013-08-01 18:43:59 -0500585 * 1. The system BIOS should NOT automatically control the brightness
Julius Volz98fb8fe2007-02-20 16:38:40 +0100586 * level of the LCD when the power changes from AC to DC.
Felipe Contreras21fcb342013-08-01 18:43:59 -0500587 * Return Value:
Igor Murzovea9f8852012-03-30 21:32:08 +0400588 * -EINVAL wrong arg.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589 */
590
591static int
Len Brown4be44fc2005-08-05 00:44:28 -0400592acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593{
Igor Murzovea9f8852012-03-30 21:32:08 +0400594 acpi_status status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595
Zhang Ruib0373842012-06-20 09:48:43 +0800596 if (!video->cap._DOS)
597 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598
Igor Murzovea9f8852012-03-30 21:32:08 +0400599 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
600 return -EINVAL;
Jiang Liu0db98202013-06-29 00:24:39 +0800601 video->dos_setting = (lcd_flag << 2) | bios_flag;
602 status = acpi_execute_simple_method(video->device->handle, "_DOS",
603 (lcd_flag << 2) | bios_flag);
Igor Murzovea9f8852012-03-30 21:32:08 +0400604 if (ACPI_FAILURE(status))
605 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606
Igor Murzovea9f8852012-03-30 21:32:08 +0400607 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608}
609
610/*
Zhang Rui935e5f22008-12-11 16:24:52 -0500611 * Simple comparison function used to sort backlight levels.
612 */
613
614static int
615acpi_video_cmp_level(const void *a, const void *b)
616{
617 return *(int *)a - *(int *)b;
618}
619
620/*
Aaron Lua50188d2013-04-22 14:08:32 +0200621 * Decides if _BQC/_BCQ for this system is usable
622 *
623 * We do this by changing the level first and then read out the current
624 * brightness level, if the value does not match, find out if it is using
625 * index. If not, clear the _BQC/_BCQ capability.
626 */
627static int acpi_video_bqc_quirk(struct acpi_video_device *device,
628 int max_level, int current_level)
629{
630 struct acpi_video_device_brightness *br = device->brightness;
631 int result;
632 unsigned long long level;
633 int test_level;
634
635 /* don't mess with existing known broken systems */
636 if (bqc_offset_aml_bug_workaround)
637 return 0;
638
639 /*
640 * Some systems always report current brightness level as maximum
641 * through _BQC, we need to test another value for them.
642 */
Felipe Contrerasb3b301c2013-08-03 23:00:25 +0200643 test_level = current_level == max_level ? br->levels[3] : max_level;
Aaron Lua50188d2013-04-22 14:08:32 +0200644
645 result = acpi_video_device_lcd_set_level(device, test_level);
646 if (result)
647 return result;
648
649 result = acpi_video_device_lcd_get_level_current(device, &level, true);
650 if (result)
651 return result;
652
653 if (level != test_level) {
654 /* buggy _BQC found, need to find out if it uses index */
655 if (level < br->count) {
656 if (br->flags._BCL_reversed)
657 level = br->count - 3 - level;
658 if (br->levels[level + 2] == test_level)
659 br->flags._BQC_use_index = 1;
660 }
661
662 if (!br->flags._BQC_use_index)
663 device->cap._BQC = device->cap._BCQ = 0;
664 }
665
666 return 0;
667}
668
669
670/*
Felipe Contreras21fcb342013-08-01 18:43:59 -0500671 * Arg:
672 * device : video output device (LCD, CRT, ..)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673 *
674 * Return Value:
Julia Jomantaite469778c2008-06-23 22:50:42 +0100675 * Maximum brightness level
676 *
677 * Allocate and initialize device->brightness.
678 */
679
680static int
681acpi_video_init_brightness(struct acpi_video_device *device)
682{
683 union acpi_object *obj = NULL;
Zhang Ruid32f6942009-03-18 16:27:12 +0800684 int i, max_level = 0, count = 0, level_ac_battery = 0;
Zhang Rui1a7c6182009-03-18 16:27:16 +0800685 unsigned long long level, level_old;
Julia Jomantaite469778c2008-06-23 22:50:42 +0100686 union acpi_object *o;
687 struct acpi_video_device_brightness *br = NULL;
Zhang Rui1a7c6182009-03-18 16:27:16 +0800688 int result = -EINVAL;
Julia Jomantaite469778c2008-06-23 22:50:42 +0100689
690 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
691 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
692 "LCD brightness level\n"));
693 goto out;
694 }
695
696 if (obj->package.count < 2)
697 goto out;
698
699 br = kzalloc(sizeof(*br), GFP_KERNEL);
700 if (!br) {
701 printk(KERN_ERR "can't allocate memory\n");
Zhang Rui1a7c6182009-03-18 16:27:16 +0800702 result = -ENOMEM;
Julia Jomantaite469778c2008-06-23 22:50:42 +0100703 goto out;
704 }
705
Zhang Ruid32f6942009-03-18 16:27:12 +0800706 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
Julia Jomantaite469778c2008-06-23 22:50:42 +0100707 GFP_KERNEL);
Zhang Rui1a7c6182009-03-18 16:27:16 +0800708 if (!br->levels) {
709 result = -ENOMEM;
Julia Jomantaite469778c2008-06-23 22:50:42 +0100710 goto out_free;
Zhang Rui1a7c6182009-03-18 16:27:16 +0800711 }
Julia Jomantaite469778c2008-06-23 22:50:42 +0100712
713 for (i = 0; i < obj->package.count; i++) {
714 o = (union acpi_object *)&obj->package.elements[i];
715 if (o->type != ACPI_TYPE_INTEGER) {
716 printk(KERN_ERR PREFIX "Invalid data\n");
717 continue;
718 }
719 br->levels[count] = (u32) o->integer.value;
720
721 if (br->levels[count] > max_level)
722 max_level = br->levels[count];
723 count++;
724 }
725
Zhang Ruid32f6942009-03-18 16:27:12 +0800726 /*
727 * some buggy BIOS don't export the levels
728 * when machine is on AC/Battery in _BCL package.
729 * In this case, the first two elements in _BCL packages
730 * are also supported brightness levels that OS should take care of.
731 */
Zhang Rui90af2cf2009-04-14 11:02:18 +0800732 for (i = 2; i < count; i++) {
733 if (br->levels[i] == br->levels[0])
Zhang Ruid32f6942009-03-18 16:27:12 +0800734 level_ac_battery++;
Zhang Rui90af2cf2009-04-14 11:02:18 +0800735 if (br->levels[i] == br->levels[1])
736 level_ac_battery++;
737 }
Zhang Rui935e5f22008-12-11 16:24:52 -0500738
Zhang Ruid32f6942009-03-18 16:27:12 +0800739 if (level_ac_battery < 2) {
740 level_ac_battery = 2 - level_ac_battery;
741 br->flags._BCL_no_ac_battery_levels = 1;
742 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
743 br->levels[i] = br->levels[i - level_ac_battery];
744 count += level_ac_battery;
745 } else if (level_ac_battery > 2)
Colin Ian Kingbf6787e2012-11-29 11:53:13 +0000746 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
Zhang Ruid32f6942009-03-18 16:27:12 +0800747
Zhang Ruid80fb992009-03-18 16:27:14 +0800748 /* Check if the _BCL package is in a reversed order */
749 if (max_level == br->levels[2]) {
750 br->flags._BCL_reversed = 1;
751 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
752 acpi_video_cmp_level, NULL);
753 } else if (max_level != br->levels[count - 1])
754 ACPI_ERROR((AE_INFO,
Colin Ian Kingbf6787e2012-11-29 11:53:13 +0000755 "Found unordered _BCL package"));
Julia Jomantaite469778c2008-06-23 22:50:42 +0100756
757 br->count = count;
758 device->brightness = br;
Zhang Rui1a7c6182009-03-18 16:27:16 +0800759
Zhang Rui1a7c6182009-03-18 16:27:16 +0800760 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
Zhang Rui90c53ca2009-08-31 12:39:54 -0400761 br->curr = level = max_level;
Zhang Ruie047cca2009-04-09 14:24:35 +0800762
763 if (!device->cap._BQC)
764 goto set_level;
765
Danny Baumanna89803d2013-03-19 16:22:50 +0000766 result = acpi_video_device_lcd_get_level_current(device,
767 &level_old, true);
Zhang Rui1a7c6182009-03-18 16:27:16 +0800768 if (result)
769 goto out_free_levels;
770
Aaron Lua50188d2013-04-22 14:08:32 +0200771 result = acpi_video_bqc_quirk(device, max_level, level_old);
772 if (result)
773 goto out_free_levels;
Zhang Ruie047cca2009-04-09 14:24:35 +0800774 /*
Aaron Lua50188d2013-04-22 14:08:32 +0200775 * cap._BQC may get cleared due to _BQC is found to be broken
776 * in acpi_video_bqc_quirk, so check again here.
Zhang Ruie047cca2009-04-09 14:24:35 +0800777 */
Aaron Lua50188d2013-04-22 14:08:32 +0200778 if (!device->cap._BQC)
779 goto set_level;
Zhang Rui1a7c6182009-03-18 16:27:16 +0800780
Aaron Lu545ef362013-11-15 14:39:12 +0800781 level = acpi_video_bqc_value_to_level(device, level_old);
782 /*
783 * On some buggy laptops, _BQC returns an uninitialized
784 * value when invoked for the first time, i.e.
785 * level_old is invalid (no matter whether it's a level
786 * or an index). Set the backlight to max_level in this case.
787 */
788 for (i = 2; i < br->count; i++)
789 if (level == br->levels[i])
790 break;
791 if (i == br->count || !level)
792 level = max_level;
Zhang Ruie047cca2009-04-09 14:24:35 +0800793
Zhang Ruie047cca2009-04-09 14:24:35 +0800794set_level:
Zhang Rui90c53ca2009-08-31 12:39:54 -0400795 result = acpi_video_device_lcd_set_level(device, level);
Zhang Ruie047cca2009-04-09 14:24:35 +0800796 if (result)
797 goto out_free_levels;
Zhang Rui1a7c6182009-03-18 16:27:16 +0800798
Zhang Ruid32f6942009-03-18 16:27:12 +0800799 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
800 "found %d brightness levels\n", count - 2));
Julia Jomantaite469778c2008-06-23 22:50:42 +0100801 kfree(obj);
Zhang Rui1a7c6182009-03-18 16:27:16 +0800802 return result;
Julia Jomantaite469778c2008-06-23 22:50:42 +0100803
804out_free_levels:
805 kfree(br->levels);
806out_free:
807 kfree(br);
808out:
809 device->brightness = NULL;
810 kfree(obj);
Zhang Rui1a7c6182009-03-18 16:27:16 +0800811 return result;
Julia Jomantaite469778c2008-06-23 22:50:42 +0100812}
813
814/*
815 * Arg:
816 * device : video output device (LCD, CRT, ..)
817 *
818 * Return Value:
Felipe Contreras21fcb342013-08-01 18:43:59 -0500819 * None
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820 *
Julius Volz98fb8fe2007-02-20 16:38:40 +0100821 * Find out all required AML methods defined under the output
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822 * device.
823 */
824
Len Brown4be44fc2005-08-05 00:44:28 -0400825static void acpi_video_device_find_cap(struct acpi_video_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826{
Jiang Liu952c63e2013-06-29 00:24:38 +0800827 if (acpi_has_method(device->dev->handle, "_ADR"))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828 device->cap._ADR = 1;
Jiang Liu952c63e2013-06-29 00:24:38 +0800829 if (acpi_has_method(device->dev->handle, "_BCL"))
Len Brown4be44fc2005-08-05 00:44:28 -0400830 device->cap._BCL = 1;
Jiang Liu952c63e2013-06-29 00:24:38 +0800831 if (acpi_has_method(device->dev->handle, "_BCM"))
Len Brown4be44fc2005-08-05 00:44:28 -0400832 device->cap._BCM = 1;
Jiang Liu952c63e2013-06-29 00:24:38 +0800833 if (acpi_has_method(device->dev->handle, "_BQC")) {
Yu Luming2f3d0002006-11-11 02:40:34 +0800834 device->cap._BQC = 1;
Jiang Liu952c63e2013-06-29 00:24:38 +0800835 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
Zhang Ruic60d6382009-03-18 16:27:18 +0800836 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
837 device->cap._BCQ = 1;
838 }
839
Jiang Liu952c63e2013-06-29 00:24:38 +0800840 if (acpi_has_method(device->dev->handle, "_DDC"))
Len Brown4be44fc2005-08-05 00:44:28 -0400841 device->cap._DDC = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842}
843
844/*
Felipe Contreras21fcb342013-08-01 18:43:59 -0500845 * Arg:
846 * device : video output device (VGA)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847 *
848 * Return Value:
Felipe Contreras21fcb342013-08-01 18:43:59 -0500849 * None
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850 *
Julius Volz98fb8fe2007-02-20 16:38:40 +0100851 * Find out all required AML methods defined under the video bus device.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852 */
853
Len Brown4be44fc2005-08-05 00:44:28 -0400854static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855{
Jiang Liu952c63e2013-06-29 00:24:38 +0800856 if (acpi_has_method(video->device->handle, "_DOS"))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857 video->cap._DOS = 1;
Jiang Liu952c63e2013-06-29 00:24:38 +0800858 if (acpi_has_method(video->device->handle, "_DOD"))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859 video->cap._DOD = 1;
Jiang Liu952c63e2013-06-29 00:24:38 +0800860 if (acpi_has_method(video->device->handle, "_ROM"))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861 video->cap._ROM = 1;
Jiang Liu952c63e2013-06-29 00:24:38 +0800862 if (acpi_has_method(video->device->handle, "_GPD"))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863 video->cap._GPD = 1;
Jiang Liu952c63e2013-06-29 00:24:38 +0800864 if (acpi_has_method(video->device->handle, "_SPD"))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865 video->cap._SPD = 1;
Jiang Liu952c63e2013-06-29 00:24:38 +0800866 if (acpi_has_method(video->device->handle, "_VPO"))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867 video->cap._VPO = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868}
869
870/*
871 * Check whether the video bus device has required AML method to
872 * support the desired features
873 */
874
Len Brown4be44fc2005-08-05 00:44:28 -0400875static int acpi_video_bus_check(struct acpi_video_bus *video)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876{
Len Brown4be44fc2005-08-05 00:44:28 -0400877 acpi_status status = -ENOENT;
Alexander Chiang1e4cffe2009-06-10 19:56:00 +0000878 struct pci_dev *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879
880 if (!video)
Patrick Mocheld550d982006-06-27 00:41:40 -0400881 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882
Alexander Chiang1e4cffe2009-06-10 19:56:00 +0000883 dev = acpi_get_pci_dev(video->device->handle);
Thomas Renninger22c13f92008-08-01 17:37:54 +0200884 if (!dev)
885 return -ENODEV;
Alexander Chiang1e4cffe2009-06-10 19:56:00 +0000886 pci_dev_put(dev);
Thomas Renninger22c13f92008-08-01 17:37:54 +0200887
Felipe Contreras21fcb342013-08-01 18:43:59 -0500888 /*
889 * Since there is no HID, CID and so on for VGA driver, we have
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890 * to check well known required nodes.
891 */
892
Julius Volz98fb8fe2007-02-20 16:38:40 +0100893 /* Does this device support video switching? */
Stefan Bader3a1151e2009-08-21 11:03:05 +0200894 if (video->cap._DOS || video->cap._DOD) {
895 if (!video->cap._DOS) {
896 printk(KERN_WARNING FW_BUG
897 "ACPI(%s) defines _DOD but not _DOS\n",
898 acpi_device_bid(video->device));
899 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900 video->flags.multihead = 1;
901 status = 0;
902 }
903
Julius Volz98fb8fe2007-02-20 16:38:40 +0100904 /* Does this device support retrieving a video ROM? */
Len Brown4be44fc2005-08-05 00:44:28 -0400905 if (video->cap._ROM) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906 video->flags.rom = 1;
907 status = 0;
908 }
909
Julius Volz98fb8fe2007-02-20 16:38:40 +0100910 /* Does this device support configuring which video device to POST? */
Len Brown4be44fc2005-08-05 00:44:28 -0400911 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912 video->flags.post = 1;
913 status = 0;
914 }
915
Patrick Mocheld550d982006-06-27 00:41:40 -0400916 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917}
918
Felipe Contreras21fcb342013-08-01 18:43:59 -0500919/*
920 * --------------------------------------------------------------------------
921 * Driver Interface
922 * --------------------------------------------------------------------------
923 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700924
925/* device interface */
Felipe Contreras915ea7e2013-08-03 22:12:50 +0200926static struct acpi_video_device_attrib *
Rui Zhang82cae992007-01-03 23:40:53 -0500927acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
928{
Dmitry Torokhov78eed022007-11-05 11:43:33 -0500929 struct acpi_video_enumerated_device *ids;
930 int i;
Rui Zhang82cae992007-01-03 23:40:53 -0500931
Dmitry Torokhov78eed022007-11-05 11:43:33 -0500932 for (i = 0; i < video->attached_count; i++) {
933 ids = &video->attached_array[i];
934 if ((ids->value.int_val & 0xffff) == device_id)
935 return &ids->value.attrib;
936 }
937
Rui Zhang82cae992007-01-03 23:40:53 -0500938 return NULL;
939}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940
941static int
Matthew Garrette92a7162010-01-12 14:17:03 -0500942acpi_video_get_device_type(struct acpi_video_bus *video,
943 unsigned long device_id)
944{
945 struct acpi_video_enumerated_device *ids;
946 int i;
947
948 for (i = 0; i < video->attached_count; i++) {
949 ids = &video->attached_array[i];
950 if ((ids->value.int_val & 0xffff) == device_id)
951 return ids->value.int_val;
952 }
953
954 return 0;
955}
956
957static int
Len Brown4be44fc2005-08-05 00:44:28 -0400958acpi_video_bus_get_one_device(struct acpi_device *device,
959 struct acpi_video_bus *video)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960{
Matthew Wilcox27663c52008-10-10 02:22:59 -0400961 unsigned long long device_id;
Matthew Garrette92a7162010-01-12 14:17:03 -0500962 int status, device_type;
Len Brown4be44fc2005-08-05 00:44:28 -0400963 struct acpi_video_device *data;
Felipe Contreras915ea7e2013-08-03 22:12:50 +0200964 struct acpi_video_device_attrib *attribute;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965
Len Brown4be44fc2005-08-05 00:44:28 -0400966 status =
967 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
Aaron Lu91e13aa2013-04-25 02:47:49 +0000968 /* Some device omits _ADR, we skip them instead of fail */
969 if (ACPI_FAILURE(status))
970 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971
Aaron Lu91e13aa2013-04-25 02:47:49 +0000972 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
973 if (!data)
974 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975
Aaron Lu91e13aa2013-04-25 02:47:49 +0000976 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
977 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
978 device->driver_data = data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979
Aaron Lu91e13aa2013-04-25 02:47:49 +0000980 data->device_id = device_id;
981 data->video = video;
982 data->dev = device;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983
Aaron Lu91e13aa2013-04-25 02:47:49 +0000984 attribute = acpi_video_get_device_attr(video, device_id);
Rui Zhang82cae992007-01-03 23:40:53 -0500985
Felipe Contreras915ea7e2013-08-03 22:12:50 +0200986 if (attribute && attribute->device_id_scheme) {
Aaron Lu91e13aa2013-04-25 02:47:49 +0000987 switch (attribute->display_type) {
988 case ACPI_VIDEO_DISPLAY_CRT:
989 data->flags.crt = 1;
990 break;
991 case ACPI_VIDEO_DISPLAY_TV:
992 data->flags.tvout = 1;
993 break;
994 case ACPI_VIDEO_DISPLAY_DVI:
995 data->flags.dvi = 1;
996 break;
997 case ACPI_VIDEO_DISPLAY_LCD:
998 data->flags.lcd = 1;
999 break;
1000 default:
1001 data->flags.unknown = 1;
1002 break;
1003 }
Felipe Contreras915ea7e2013-08-03 22:12:50 +02001004 if (attribute->bios_can_detect)
Aaron Lu91e13aa2013-04-25 02:47:49 +00001005 data->flags.bios = 1;
1006 } else {
1007 /* Check for legacy IDs */
1008 device_type = acpi_video_get_device_type(video, device_id);
1009 /* Ignore bits 16 and 18-20 */
1010 switch (device_type & 0xffe2ffff) {
Felipe Contreras915ea7e2013-08-03 22:12:50 +02001011 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1012 data->flags.crt = 1;
1013 break;
1014 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1015 data->flags.lcd = 1;
1016 break;
1017 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1018 data->flags.tvout = 1;
1019 break;
1020 default:
1021 data->flags.unknown = 1;
Matthew Garrette92a7162010-01-12 14:17:03 -05001022 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023 }
1024
Aaron Lu91e13aa2013-04-25 02:47:49 +00001025 acpi_video_device_bind(video, data);
1026 acpi_video_device_find_cap(data);
1027
Aaron Lu91e13aa2013-04-25 02:47:49 +00001028 mutex_lock(&video->device_list_lock);
1029 list_add_tail(&data->entry, &video->video_device_list);
1030 mutex_unlock(&video->device_list_lock);
1031
1032 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033}
1034
1035/*
1036 * Arg:
Felipe Contreras21fcb342013-08-01 18:43:59 -05001037 * video : video bus device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038 *
1039 * Return:
Felipe Contreras21fcb342013-08-01 18:43:59 -05001040 * none
1041 *
1042 * Enumerate the video device list of the video bus,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001043 * bind the ids with the corresponding video devices
1044 * under the video bus.
Len Brown4be44fc2005-08-05 00:44:28 -04001045 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046
Len Brown4be44fc2005-08-05 00:44:28 -04001047static void acpi_video_device_rebind(struct acpi_video_bus *video)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048{
Dmitry Torokhovff102ea2007-11-05 11:43:31 -05001049 struct acpi_video_device *dev;
1050
Dmitry Torokhovbbac81f2007-11-05 11:43:32 -05001051 mutex_lock(&video->device_list_lock);
Dmitry Torokhovff102ea2007-11-05 11:43:31 -05001052
1053 list_for_each_entry(dev, &video->video_device_list, entry)
Len Brown4be44fc2005-08-05 00:44:28 -04001054 acpi_video_device_bind(video, dev);
Dmitry Torokhovff102ea2007-11-05 11:43:31 -05001055
Dmitry Torokhovbbac81f2007-11-05 11:43:32 -05001056 mutex_unlock(&video->device_list_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001057}
1058
1059/*
1060 * Arg:
Felipe Contreras21fcb342013-08-01 18:43:59 -05001061 * video : video bus device
1062 * device : video output device under the video
1063 * bus
Linus Torvalds1da177e2005-04-16 15:20:36 -07001064 *
1065 * Return:
Felipe Contreras21fcb342013-08-01 18:43:59 -05001066 * none
1067 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068 * Bind the ids with the corresponding video devices
1069 * under the video bus.
Len Brown4be44fc2005-08-05 00:44:28 -04001070 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071
1072static void
Len Brown4be44fc2005-08-05 00:44:28 -04001073acpi_video_device_bind(struct acpi_video_bus *video,
1074 struct acpi_video_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075{
Dmitry Torokhov78eed022007-11-05 11:43:33 -05001076 struct acpi_video_enumerated_device *ids;
Len Brown4be44fc2005-08-05 00:44:28 -04001077 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001078
Dmitry Torokhov78eed022007-11-05 11:43:33 -05001079 for (i = 0; i < video->attached_count; i++) {
1080 ids = &video->attached_array[i];
1081 if (device->device_id == (ids->value.int_val & 0xffff)) {
1082 ids->bind_info = device;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1084 }
1085 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086}
1087
1088/*
1089 * Arg:
Felipe Contreras21fcb342013-08-01 18:43:59 -05001090 * video : video bus device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001091 *
1092 * Return:
Felipe Contreras21fcb342013-08-01 18:43:59 -05001093 * < 0 : error
1094 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001095 * Call _DOD to enumerate all devices attached to display adapter
1096 *
Len Brown4be44fc2005-08-05 00:44:28 -04001097 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001098
1099static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1100{
Len Brown4be44fc2005-08-05 00:44:28 -04001101 int status;
1102 int count;
1103 int i;
Dmitry Torokhov78eed022007-11-05 11:43:33 -05001104 struct acpi_video_enumerated_device *active_list;
Len Brown4be44fc2005-08-05 00:44:28 -04001105 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1106 union acpi_object *dod = NULL;
1107 union acpi_object *obj;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001108
Patrick Mochel90130262006-05-19 16:54:48 -04001109 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110 if (!ACPI_SUCCESS(status)) {
Thomas Renningera6fc6722006-06-26 23:58:43 -04001111 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
Patrick Mocheld550d982006-06-27 00:41:40 -04001112 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001113 }
1114
Jan Engelhardt50dd0962006-10-01 00:28:50 +02001115 dod = buffer.pointer;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001116 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
Thomas Renningera6fc6722006-06-26 23:58:43 -04001117 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001118 status = -EFAULT;
1119 goto out;
1120 }
1121
1122 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
Len Brown4be44fc2005-08-05 00:44:28 -04001123 dod->package.count));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001124
Dmitry Torokhov78eed022007-11-05 11:43:33 -05001125 active_list = kcalloc(1 + dod->package.count,
1126 sizeof(struct acpi_video_enumerated_device),
1127 GFP_KERNEL);
1128 if (!active_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129 status = -ENOMEM;
1130 goto out;
1131 }
1132
1133 count = 0;
1134 for (i = 0; i < dod->package.count; i++) {
Jan Engelhardt50dd0962006-10-01 00:28:50 +02001135 obj = &dod->package.elements[i];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001136
1137 if (obj->type != ACPI_TYPE_INTEGER) {
Dmitry Torokhov78eed022007-11-05 11:43:33 -05001138 printk(KERN_ERR PREFIX
1139 "Invalid _DOD data in element %d\n", i);
1140 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001141 }
Dmitry Torokhov78eed022007-11-05 11:43:33 -05001142
1143 active_list[count].value.int_val = obj->integer.value;
1144 active_list[count].bind_info = NULL;
Len Brown4be44fc2005-08-05 00:44:28 -04001145 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1146 (int)obj->integer.value));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001147 count++;
1148 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149
Jesper Juhl6044ec82005-11-07 01:01:32 -08001150 kfree(video->attached_array);
Len Brown4be44fc2005-08-05 00:44:28 -04001151
Dmitry Torokhov78eed022007-11-05 11:43:33 -05001152 video->attached_array = active_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001153 video->attached_count = count;
Dmitry Torokhov78eed022007-11-05 11:43:33 -05001154
Felipe Contreras915ea7e2013-08-03 22:12:50 +02001155out:
Len Brown02438d82006-06-30 03:19:10 -04001156 kfree(buffer.pointer);
Patrick Mocheld550d982006-06-27 00:41:40 -04001157 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158}
1159
Len Brown4be44fc2005-08-05 00:44:28 -04001160static int
1161acpi_video_get_next_level(struct acpi_video_device *device,
1162 u32 level_current, u32 event)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001163{
Alexey Starikovskiy63f0edf2007-09-03 16:30:08 +04001164 int min, max, min_above, max_below, i, l, delta = 255;
Thomas Tuttlef4715182006-12-19 12:56:14 -08001165 max = max_below = 0;
1166 min = min_above = 255;
Alexey Starikovskiy63f0edf2007-09-03 16:30:08 +04001167 /* Find closest level to level_current */
Zhao Yakui0a3db1c2009-02-02 11:33:41 +08001168 for (i = 2; i < device->brightness->count; i++) {
Alexey Starikovskiy63f0edf2007-09-03 16:30:08 +04001169 l = device->brightness->levels[i];
1170 if (abs(l - level_current) < abs(delta)) {
1171 delta = l - level_current;
1172 if (!delta)
1173 break;
1174 }
1175 }
1176 /* Ajust level_current to closest available level */
1177 level_current += delta;
Zhao Yakui0a3db1c2009-02-02 11:33:41 +08001178 for (i = 2; i < device->brightness->count; i++) {
Thomas Tuttlef4715182006-12-19 12:56:14 -08001179 l = device->brightness->levels[i];
1180 if (l < min)
1181 min = l;
1182 if (l > max)
1183 max = l;
1184 if (l < min_above && l > level_current)
1185 min_above = l;
1186 if (l > max_below && l < level_current)
1187 max_below = l;
1188 }
1189
1190 switch (event) {
1191 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1192 return (level_current < max) ? min_above : min;
1193 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1194 return (level_current < max) ? min_above : max;
1195 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1196 return (level_current > min) ? max_below : min;
1197 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1198 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1199 return 0;
1200 default:
1201 return level_current;
1202 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203}
1204
Zhang Ruic8890f92009-03-18 16:27:08 +08001205static int
Len Brown4be44fc2005-08-05 00:44:28 -04001206acpi_video_switch_brightness(struct acpi_video_device *device, int event)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207{
Matthew Wilcox27663c52008-10-10 02:22:59 -04001208 unsigned long long level_current, level_next;
Zhang Ruic8890f92009-03-18 16:27:08 +08001209 int result = -EINVAL;
1210
Aaron Lufbc9fe12013-10-11 21:27:45 +08001211 /* no warning message if acpi_backlight=vendor or a quirk is used */
1212 if (!acpi_video_verify_backlight_support())
Zhang Rui28c32e92009-07-13 10:33:24 +08001213 return 0;
1214
Julia Jomantaite469778c2008-06-23 22:50:42 +01001215 if (!device->brightness)
Zhang Ruic8890f92009-03-18 16:27:08 +08001216 goto out;
1217
1218 result = acpi_video_device_lcd_get_level_current(device,
Danny Baumanna89803d2013-03-19 16:22:50 +00001219 &level_current,
1220 false);
Zhang Ruic8890f92009-03-18 16:27:08 +08001221 if (result)
1222 goto out;
1223
Linus Torvalds1da177e2005-04-16 15:20:36 -07001224 level_next = acpi_video_get_next_level(device, level_current, event);
Zhang Ruic8890f92009-03-18 16:27:08 +08001225
Zhang Rui24450c72009-03-18 16:27:10 +08001226 result = acpi_video_device_lcd_set_level(device, level_next);
Zhang Ruic8890f92009-03-18 16:27:08 +08001227
Matthew Garrett36342742009-07-14 17:06:03 +01001228 if (!result)
1229 backlight_force_update(device->backlight,
1230 BACKLIGHT_UPDATE_HOTKEY);
1231
Zhang Ruic8890f92009-03-18 16:27:08 +08001232out:
1233 if (result)
1234 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
1235
1236 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001237}
1238
Matthew Garrette92a7162010-01-12 14:17:03 -05001239int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1240 void **edid)
1241{
1242 struct acpi_video_bus *video;
1243 struct acpi_video_device *video_device;
1244 union acpi_object *buffer = NULL;
1245 acpi_status status;
1246 int i, length;
1247
1248 if (!device || !acpi_driver_data(device))
1249 return -EINVAL;
1250
1251 video = acpi_driver_data(device);
1252
1253 for (i = 0; i < video->attached_count; i++) {
1254 video_device = video->attached_array[i].bind_info;
1255 length = 256;
1256
1257 if (!video_device)
1258 continue;
1259
Zhang Rui82069552010-12-06 15:04:24 +08001260 if (!video_device->cap._DDC)
1261 continue;
1262
Matthew Garrette92a7162010-01-12 14:17:03 -05001263 if (type) {
1264 switch (type) {
1265 case ACPI_VIDEO_DISPLAY_CRT:
1266 if (!video_device->flags.crt)
1267 continue;
1268 break;
1269 case ACPI_VIDEO_DISPLAY_TV:
1270 if (!video_device->flags.tvout)
1271 continue;
1272 break;
1273 case ACPI_VIDEO_DISPLAY_DVI:
1274 if (!video_device->flags.dvi)
1275 continue;
1276 break;
1277 case ACPI_VIDEO_DISPLAY_LCD:
1278 if (!video_device->flags.lcd)
1279 continue;
1280 break;
1281 }
1282 } else if (video_device->device_id != device_id) {
1283 continue;
1284 }
1285
1286 status = acpi_video_device_EDID(video_device, &buffer, length);
1287
1288 if (ACPI_FAILURE(status) || !buffer ||
1289 buffer->type != ACPI_TYPE_BUFFER) {
1290 length = 128;
1291 status = acpi_video_device_EDID(video_device, &buffer,
1292 length);
1293 if (ACPI_FAILURE(status) || !buffer ||
1294 buffer->type != ACPI_TYPE_BUFFER) {
1295 continue;
1296 }
1297 }
1298
1299 *edid = buffer->buffer.pointer;
1300 return length;
1301 }
1302
1303 return -ENODEV;
1304}
1305EXPORT_SYMBOL(acpi_video_get_edid);
1306
Linus Torvalds1da177e2005-04-16 15:20:36 -07001307static int
Len Brown4be44fc2005-08-05 00:44:28 -04001308acpi_video_bus_get_devices(struct acpi_video_bus *video,
1309 struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001310{
Igor Murzovfba4e082012-10-13 04:41:25 +04001311 int status = 0;
Dmitry Torokhovff102ea2007-11-05 11:43:31 -05001312 struct acpi_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001313
Igor Murzovfba4e082012-10-13 04:41:25 +04001314 /*
1315 * There are systems where video module known to work fine regardless
1316 * of broken _DOD and ignoring returned value here doesn't cause
1317 * any issues later.
1318 */
1319 acpi_video_device_enumerate(video);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001320
Dmitry Torokhovff102ea2007-11-05 11:43:31 -05001321 list_for_each_entry(dev, &device->children, node) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001322
1323 status = acpi_video_bus_get_one_device(dev, video);
Igor Murzovea9f8852012-03-30 21:32:08 +04001324 if (status) {
Aaron Lu91e13aa2013-04-25 02:47:49 +00001325 dev_err(&dev->dev, "Can't attach device\n");
1326 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001327 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001328 }
Patrick Mocheld550d982006-06-27 00:41:40 -04001329 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001330}
1331
Linus Torvalds1da177e2005-04-16 15:20:36 -07001332/* acpi_video interface */
1333
Aaron Luefaa14c2013-07-16 13:08:05 +08001334/*
1335 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1336 * preform any automatic brightness change on receiving a notification.
1337 */
Len Brown4be44fc2005-08-05 00:44:28 -04001338static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001339{
Aaron Luefaa14c2013-07-16 13:08:05 +08001340 return acpi_video_bus_DOS(video, 0,
Aaron Lufbc9fe12013-10-11 21:27:45 +08001341 acpi_osi_is_win8() ? 1 : 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001342}
1343
Len Brown4be44fc2005-08-05 00:44:28 -04001344static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345{
Aaron Luefaa14c2013-07-16 13:08:05 +08001346 return acpi_video_bus_DOS(video, 0,
Aaron Lufbc9fe12013-10-11 21:27:45 +08001347 acpi_osi_is_win8() ? 0 : 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001348}
1349
Bjorn Helgaas70155582009-04-07 15:37:11 +00001350static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001351{
Bjorn Helgaas70155582009-04-07 15:37:11 +00001352 struct acpi_video_bus *video = acpi_driver_data(device);
Luming Yue9dab192007-08-20 18:23:53 +08001353 struct input_dev *input;
Matthew Garrett17c452f2009-12-11 17:40:46 -05001354 int keycode = 0;
Luming Yue9dab192007-08-20 18:23:53 +08001355
Aaron Lu67b662e2013-10-11 21:27:44 +08001356 if (!video || !video->input)
Patrick Mocheld550d982006-06-27 00:41:40 -04001357 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001358
Luming Yue9dab192007-08-20 18:23:53 +08001359 input = video->input;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001360
1361 switch (event) {
Julius Volz98fb8fe2007-02-20 16:38:40 +01001362 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001363 * most likely via hotkey. */
Luca Tettamanti8a37c652012-08-02 15:30:27 +02001364 keycode = KEY_SWITCHVIDEOMODE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001365 break;
1366
Julius Volz98fb8fe2007-02-20 16:38:40 +01001367 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
Linus Torvalds1da177e2005-04-16 15:20:36 -07001368 * connector. */
1369 acpi_video_device_enumerate(video);
1370 acpi_video_device_rebind(video);
Luming Yue9dab192007-08-20 18:23:53 +08001371 keycode = KEY_SWITCHVIDEOMODE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001372 break;
1373
Len Brown4be44fc2005-08-05 00:44:28 -04001374 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
Luming Yue9dab192007-08-20 18:23:53 +08001375 keycode = KEY_SWITCHVIDEOMODE;
1376 break;
Len Brown4be44fc2005-08-05 00:44:28 -04001377 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
Luming Yue9dab192007-08-20 18:23:53 +08001378 keycode = KEY_VIDEO_NEXT;
1379 break;
Len Brown4be44fc2005-08-05 00:44:28 -04001380 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
Luming Yue9dab192007-08-20 18:23:53 +08001381 keycode = KEY_VIDEO_PREV;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001382 break;
1383
1384 default:
1385 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -04001386 "Unsupported event [0x%x]\n", event));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001387 break;
1388 }
1389
Luca Tettamanti8a37c652012-08-02 15:30:27 +02001390 if (acpi_notifier_call_chain(device, event, 0))
1391 /* Something vetoed the keypress. */
1392 keycode = 0;
Matthew Garrett17c452f2009-12-11 17:40:46 -05001393
1394 if (keycode) {
1395 input_report_key(input, keycode, 1);
1396 input_sync(input);
1397 input_report_key(input, keycode, 0);
1398 input_sync(input);
1399 }
Luming Yue9dab192007-08-20 18:23:53 +08001400
Patrick Mocheld550d982006-06-27 00:41:40 -04001401 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001402}
1403
Len Brown4be44fc2005-08-05 00:44:28 -04001404static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001405{
Jan Engelhardt50dd0962006-10-01 00:28:50 +02001406 struct acpi_video_device *video_device = data;
Len Brown4be44fc2005-08-05 00:44:28 -04001407 struct acpi_device *device = NULL;
Luming Yue9dab192007-08-20 18:23:53 +08001408 struct acpi_video_bus *bus;
1409 struct input_dev *input;
Matthew Garrett17c452f2009-12-11 17:40:46 -05001410 int keycode = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001411
Linus Torvalds1da177e2005-04-16 15:20:36 -07001412 if (!video_device)
Patrick Mocheld550d982006-06-27 00:41:40 -04001413 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001414
Patrick Mochele6afa0d2006-05-19 16:54:40 -04001415 device = video_device->dev;
Luming Yue9dab192007-08-20 18:23:53 +08001416 bus = video_device->video;
1417 input = bus->input;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001418
1419 switch (event) {
Len Brown4be44fc2005-08-05 00:44:28 -04001420 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
Zhang Rui8a681a42008-01-25 14:47:49 +08001421 if (brightness_switch_enabled)
1422 acpi_video_switch_brightness(video_device, event);
Luming Yue9dab192007-08-20 18:23:53 +08001423 keycode = KEY_BRIGHTNESS_CYCLE;
1424 break;
Len Brown4be44fc2005-08-05 00:44:28 -04001425 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
Zhang Rui8a681a42008-01-25 14:47:49 +08001426 if (brightness_switch_enabled)
1427 acpi_video_switch_brightness(video_device, event);
Luming Yue9dab192007-08-20 18:23:53 +08001428 keycode = KEY_BRIGHTNESSUP;
1429 break;
Len Brown4be44fc2005-08-05 00:44:28 -04001430 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
Zhang Rui8a681a42008-01-25 14:47:49 +08001431 if (brightness_switch_enabled)
1432 acpi_video_switch_brightness(video_device, event);
Luming Yue9dab192007-08-20 18:23:53 +08001433 keycode = KEY_BRIGHTNESSDOWN;
1434 break;
Justin P. Mattock70f23fd2011-05-10 10:16:21 +02001435 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
Zhang Rui8a681a42008-01-25 14:47:49 +08001436 if (brightness_switch_enabled)
1437 acpi_video_switch_brightness(video_device, event);
Luming Yue9dab192007-08-20 18:23:53 +08001438 keycode = KEY_BRIGHTNESS_ZERO;
1439 break;
Len Brown4be44fc2005-08-05 00:44:28 -04001440 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
Zhang Rui8a681a42008-01-25 14:47:49 +08001441 if (brightness_switch_enabled)
1442 acpi_video_switch_brightness(video_device, event);
Luming Yue9dab192007-08-20 18:23:53 +08001443 keycode = KEY_DISPLAY_OFF;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001444 break;
1445 default:
1446 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -04001447 "Unsupported event [0x%x]\n", event));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001448 break;
1449 }
Luming Yue9dab192007-08-20 18:23:53 +08001450
Zhang Rui7761f632008-01-25 14:48:12 +08001451 acpi_notifier_call_chain(device, event, 0);
Matthew Garrett17c452f2009-12-11 17:40:46 -05001452
1453 if (keycode) {
1454 input_report_key(input, keycode, 1);
1455 input_sync(input);
1456 input_report_key(input, keycode, 0);
1457 input_sync(input);
1458 }
Luming Yue9dab192007-08-20 18:23:53 +08001459
Patrick Mocheld550d982006-06-27 00:41:40 -04001460 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001461}
1462
Rafael J. Wysockiac7729d2010-04-05 01:43:51 +02001463static int acpi_video_resume(struct notifier_block *nb,
1464 unsigned long val, void *ign)
Matthew Garrett863c1492008-02-04 23:31:24 -08001465{
1466 struct acpi_video_bus *video;
1467 struct acpi_video_device *video_device;
1468 int i;
1469
Rafael J. Wysockiac7729d2010-04-05 01:43:51 +02001470 switch (val) {
1471 case PM_HIBERNATION_PREPARE:
1472 case PM_SUSPEND_PREPARE:
1473 case PM_RESTORE_PREPARE:
1474 return NOTIFY_DONE;
1475 }
Matthew Garrett863c1492008-02-04 23:31:24 -08001476
Rafael J. Wysockiac7729d2010-04-05 01:43:51 +02001477 video = container_of(nb, struct acpi_video_bus, pm_nb);
1478
1479 dev_info(&video->device->dev, "Restoring backlight state\n");
Matthew Garrett863c1492008-02-04 23:31:24 -08001480
1481 for (i = 0; i < video->attached_count; i++) {
1482 video_device = video->attached_array[i].bind_info;
1483 if (video_device && video_device->backlight)
1484 acpi_video_set_brightness(video_device->backlight);
1485 }
Rafael J. Wysockiac7729d2010-04-05 01:43:51 +02001486
1487 return NOTIFY_OK;
Matthew Garrett863c1492008-02-04 23:31:24 -08001488}
1489
Zhang Ruic504f8c2009-12-30 15:59:23 +08001490static acpi_status
1491acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1492 void **return_value)
1493{
1494 struct acpi_device *device = context;
1495 struct acpi_device *sibling;
1496 int result;
1497
1498 if (handle == device->handle)
1499 return AE_CTRL_TERMINATE;
1500
1501 result = acpi_bus_get_device(handle, &sibling);
1502 if (result)
1503 return AE_OK;
1504
1505 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1506 return AE_ALREADY_EXISTS;
1507
1508 return AE_OK;
1509}
1510
Aaron Lu67b662e2013-10-11 21:27:44 +08001511static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1512{
Aaron Lufbc9fe12013-10-11 21:27:45 +08001513 if (acpi_video_verify_backlight_support()) {
Aaron Lu67b662e2013-10-11 21:27:44 +08001514 struct backlight_properties props;
1515 struct pci_dev *pdev;
1516 acpi_handle acpi_parent;
1517 struct device *parent = NULL;
1518 int result;
1519 static int count;
1520 char *name;
1521
1522 result = acpi_video_init_brightness(device);
1523 if (result)
1524 return;
1525 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1526 if (!name)
1527 return;
1528 count++;
1529
1530 acpi_get_parent(device->dev->handle, &acpi_parent);
1531
1532 pdev = acpi_get_pci_dev(acpi_parent);
1533 if (pdev) {
1534 parent = &pdev->dev;
1535 pci_dev_put(pdev);
1536 }
1537
1538 memset(&props, 0, sizeof(struct backlight_properties));
1539 props.type = BACKLIGHT_FIRMWARE;
1540 props.max_brightness = device->brightness->count - 3;
1541 device->backlight = backlight_device_register(name,
1542 parent,
1543 device,
1544 &acpi_backlight_ops,
1545 &props);
1546 kfree(name);
1547 if (IS_ERR(device->backlight))
1548 return;
1549
1550 /*
1551 * Save current brightness level in case we have to restore it
1552 * before acpi_video_device_lcd_set_level() is called next time.
1553 */
1554 device->backlight->props.brightness =
1555 acpi_video_get_brightness(device->backlight);
1556
1557 device->cooling_dev = thermal_cooling_device_register("LCD",
1558 device->dev, &video_cooling_ops);
1559 if (IS_ERR(device->cooling_dev)) {
1560 /*
1561 * Set cooling_dev to NULL so we don't crash trying to
1562 * free it.
1563 * Also, why the hell we are returning early and
1564 * not attempt to register video output if cooling
1565 * device registration failed?
1566 * -- dtor
1567 */
1568 device->cooling_dev = NULL;
1569 return;
1570 }
1571
1572 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1573 device->cooling_dev->id);
1574 result = sysfs_create_link(&device->dev->dev.kobj,
1575 &device->cooling_dev->device.kobj,
1576 "thermal_cooling");
1577 if (result)
1578 printk(KERN_ERR PREFIX "Create sysfs link\n");
1579 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1580 &device->dev->dev.kobj, "device");
1581 if (result)
1582 printk(KERN_ERR PREFIX "Create sysfs link\n");
1583 }
1584}
1585
1586static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1587{
1588 struct acpi_video_device *dev;
1589
1590 mutex_lock(&video->device_list_lock);
1591 list_for_each_entry(dev, &video->video_device_list, entry)
1592 acpi_video_dev_register_backlight(dev);
1593 mutex_unlock(&video->device_list_lock);
1594
1595 video->pm_nb.notifier_call = acpi_video_resume;
1596 video->pm_nb.priority = 0;
1597 return register_pm_notifier(&video->pm_nb);
1598}
1599
1600static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1601{
1602 if (device->backlight) {
1603 backlight_device_unregister(device->backlight);
1604 device->backlight = NULL;
1605 }
1606 if (device->brightness) {
1607 kfree(device->brightness->levels);
1608 kfree(device->brightness);
1609 device->brightness = NULL;
1610 }
1611 if (device->cooling_dev) {
1612 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1613 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1614 thermal_cooling_device_unregister(device->cooling_dev);
1615 device->cooling_dev = NULL;
1616 }
1617}
1618
1619static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1620{
1621 struct acpi_video_device *dev;
1622 int error = unregister_pm_notifier(&video->pm_nb);
1623
1624 mutex_lock(&video->device_list_lock);
1625 list_for_each_entry(dev, &video->video_device_list, entry)
1626 acpi_video_dev_unregister_backlight(dev);
1627 mutex_unlock(&video->device_list_lock);
1628
1629 return error;
1630}
1631
1632static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1633{
1634 acpi_status status;
1635 struct acpi_device *adev = device->dev;
1636
1637 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1638 acpi_video_device_notify, device);
1639 if (ACPI_FAILURE(status))
1640 dev_err(&adev->dev, "Error installing notify handler\n");
1641 else
1642 device->flags.notify = 1;
1643}
1644
1645static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1646{
1647 struct input_dev *input;
1648 struct acpi_video_device *dev;
1649 int error;
1650
1651 video->input = input = input_allocate_device();
1652 if (!input) {
1653 error = -ENOMEM;
1654 goto out;
1655 }
1656
1657 error = acpi_video_bus_start_devices(video);
1658 if (error)
1659 goto err_free_input;
1660
1661 snprintf(video->phys, sizeof(video->phys),
1662 "%s/video/input0", acpi_device_hid(video->device));
1663
1664 input->name = acpi_device_name(video->device);
1665 input->phys = video->phys;
1666 input->id.bustype = BUS_HOST;
1667 input->id.product = 0x06;
1668 input->dev.parent = &video->device->dev;
1669 input->evbit[0] = BIT(EV_KEY);
1670 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1671 set_bit(KEY_VIDEO_NEXT, input->keybit);
1672 set_bit(KEY_VIDEO_PREV, input->keybit);
1673 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1674 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1675 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1676 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1677 set_bit(KEY_DISPLAY_OFF, input->keybit);
1678
1679 error = input_register_device(input);
1680 if (error)
1681 goto err_stop_dev;
1682
1683 mutex_lock(&video->device_list_lock);
1684 list_for_each_entry(dev, &video->video_device_list, entry)
1685 acpi_video_dev_add_notify_handler(dev);
1686 mutex_unlock(&video->device_list_lock);
1687
1688 return 0;
1689
1690err_stop_dev:
1691 acpi_video_bus_stop_devices(video);
1692err_free_input:
1693 input_free_device(input);
1694 video->input = NULL;
1695out:
1696 return error;
1697}
1698
1699static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
1700{
1701 if (dev->flags.notify) {
1702 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
1703 acpi_video_device_notify);
1704 dev->flags.notify = 0;
1705 }
1706}
1707
1708static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
1709{
1710 struct acpi_video_device *dev;
1711
1712 mutex_lock(&video->device_list_lock);
1713 list_for_each_entry(dev, &video->video_device_list, entry)
1714 acpi_video_dev_remove_notify_handler(dev);
1715 mutex_unlock(&video->device_list_lock);
1716
1717 acpi_video_bus_stop_devices(video);
1718 input_unregister_device(video->input);
1719 video->input = NULL;
1720}
1721
1722static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1723{
1724 struct acpi_video_device *dev, *next;
1725
1726 mutex_lock(&video->device_list_lock);
1727 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1728 list_del(&dev->entry);
1729 kfree(dev);
1730 }
1731 mutex_unlock(&video->device_list_lock);
1732
1733 return 0;
1734}
1735
Rafael J. Wysockiac7729d2010-04-05 01:43:51 +02001736static int instance;
1737
Len Brown4be44fc2005-08-05 00:44:28 -04001738static int acpi_video_bus_add(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001739{
Dmitry Torokhovf51e8392007-11-05 11:43:30 -05001740 struct acpi_video_bus *video;
Dmitry Torokhovf51e8392007-11-05 11:43:30 -05001741 int error;
Zhang Ruic504f8c2009-12-30 15:59:23 +08001742 acpi_status status;
1743
1744 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1745 device->parent->handle, 1,
1746 acpi_video_bus_match, NULL,
1747 device, NULL);
1748 if (status == AE_ALREADY_EXISTS) {
1749 printk(KERN_WARNING FW_BUG
1750 "Duplicate ACPI video bus devices for the"
1751 " same VGA controller, please try module "
1752 "parameter \"video.allow_duplicates=1\""
1753 "if the current driver doesn't work.\n");
1754 if (!allow_duplicates)
1755 return -ENODEV;
1756 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001757
Burman Yan36bcbec2006-12-19 12:56:11 -08001758 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001759 if (!video)
Patrick Mocheld550d982006-06-27 00:41:40 -04001760 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001761
Zhang Ruie6d9da12007-08-25 02:23:31 -04001762 /* a hack to fix the duplicate name "VID" problem on T61 */
1763 if (!strcmp(device->pnp.bus_id, "VID")) {
1764 if (instance)
1765 device->pnp.bus_id[3] = '0' + instance;
Felipe Contreras915ea7e2013-08-03 22:12:50 +02001766 instance++;
Zhang Ruie6d9da12007-08-25 02:23:31 -04001767 }
Zhao Yakuif3b39f12009-02-02 22:55:01 -05001768 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1769 if (!strcmp(device->pnp.bus_id, "VGA")) {
1770 if (instance)
1771 device->pnp.bus_id[3] = '0' + instance;
1772 instance++;
1773 }
Zhang Ruie6d9da12007-08-25 02:23:31 -04001774
Patrick Mochele6afa0d2006-05-19 16:54:40 -04001775 video->device = device;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001776 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1777 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
Pavel Machekdb89b4f2008-09-22 14:37:34 -07001778 device->driver_data = video;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001779
1780 acpi_video_bus_find_cap(video);
Dmitry Torokhovf51e8392007-11-05 11:43:30 -05001781 error = acpi_video_bus_check(video);
1782 if (error)
1783 goto err_free_video;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001784
Dmitry Torokhovbbac81f2007-11-05 11:43:32 -05001785 mutex_init(&video->device_list_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001786 INIT_LIST_HEAD(&video->video_device_list);
1787
Igor Murzovea9f8852012-03-30 21:32:08 +04001788 error = acpi_video_bus_get_devices(video, device);
1789 if (error)
Aaron Lu91e13aa2013-04-25 02:47:49 +00001790 goto err_put_video;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001791
Linus Torvalds1da177e2005-04-16 15:20:36 -07001792 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
Len Brown4be44fc2005-08-05 00:44:28 -04001793 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1794 video->flags.multihead ? "yes" : "no",
1795 video->flags.rom ? "yes" : "no",
1796 video->flags.post ? "yes" : "no");
Aaron Lu67b662e2013-10-11 21:27:44 +08001797 mutex_lock(&video_list_lock);
1798 list_add_tail(&video->entry, &video_bus_head);
1799 mutex_unlock(&video_list_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001800
Aaron Lu67b662e2013-10-11 21:27:44 +08001801 acpi_video_bus_register_backlight(video);
1802 acpi_video_bus_add_notify_handler(video);
Rafael J. Wysockiac7729d2010-04-05 01:43:51 +02001803
Dmitry Torokhovf51e8392007-11-05 11:43:30 -05001804 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001805
Aaron Lu67b662e2013-10-11 21:27:44 +08001806err_put_video:
Dmitry Torokhovf51e8392007-11-05 11:43:30 -05001807 acpi_video_bus_put_devices(video);
1808 kfree(video->attached_array);
Aaron Lu67b662e2013-10-11 21:27:44 +08001809err_free_video:
Dmitry Torokhovf51e8392007-11-05 11:43:30 -05001810 kfree(video);
Pavel Machekdb89b4f2008-09-22 14:37:34 -07001811 device->driver_data = NULL;
Dmitry Torokhovf51e8392007-11-05 11:43:30 -05001812
1813 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001814}
1815
Rafael J. Wysocki51fac832013-01-24 00:24:48 +01001816static int acpi_video_bus_remove(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001817{
Len Brown4be44fc2005-08-05 00:44:28 -04001818 struct acpi_video_bus *video = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001819
Linus Torvalds1da177e2005-04-16 15:20:36 -07001820
1821 if (!device || !acpi_driver_data(device))
Patrick Mocheld550d982006-06-27 00:41:40 -04001822 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001823
Jan Engelhardt50dd0962006-10-01 00:28:50 +02001824 video = acpi_driver_data(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001825
Aaron Lu67b662e2013-10-11 21:27:44 +08001826 acpi_video_bus_remove_notify_handler(video);
1827 acpi_video_bus_unregister_backlight(video);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001828 acpi_video_bus_put_devices(video);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001829
Aaron Lu67b662e2013-10-11 21:27:44 +08001830 mutex_lock(&video_list_lock);
1831 list_del(&video->entry);
1832 mutex_unlock(&video_list_lock);
1833
Jesper Juhl6044ec82005-11-07 01:01:32 -08001834 kfree(video->attached_array);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001835 kfree(video);
1836
Patrick Mocheld550d982006-06-27 00:41:40 -04001837 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001838}
1839
Alan Coxc6996bd2012-04-25 14:33:48 +01001840static int __init is_i740(struct pci_dev *dev)
1841{
1842 if (dev->device == 0x00D1)
1843 return 1;
1844 if (dev->device == 0x7000)
1845 return 1;
1846 return 0;
1847}
1848
Matthew Garrett74a365b2009-03-19 21:35:39 +00001849static int __init intel_opregion_present(void)
1850{
Alan Coxc6996bd2012-04-25 14:33:48 +01001851 int opregion = 0;
Matthew Garrett74a365b2009-03-19 21:35:39 +00001852 struct pci_dev *dev = NULL;
1853 u32 address;
1854
1855 for_each_pci_dev(dev) {
1856 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
1857 continue;
1858 if (dev->vendor != PCI_VENDOR_ID_INTEL)
1859 continue;
Alan Coxc6996bd2012-04-25 14:33:48 +01001860 /* We don't want to poke around undefined i740 registers */
1861 if (is_i740(dev))
1862 continue;
Matthew Garrett74a365b2009-03-19 21:35:39 +00001863 pci_read_config_dword(dev, 0xfc, &address);
1864 if (!address)
1865 continue;
Alan Coxc6996bd2012-04-25 14:33:48 +01001866 opregion = 1;
Matthew Garrett74a365b2009-03-19 21:35:39 +00001867 }
Alan Coxc6996bd2012-04-25 14:33:48 +01001868 return opregion;
Matthew Garrett74a365b2009-03-19 21:35:39 +00001869}
1870
Rafael J. Wysocki8e5c2b72013-07-25 21:43:39 +02001871int acpi_video_register(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001872{
Rafael J. Wysocki8e5c2b72013-07-25 21:43:39 +02001873 int result = 0;
Zhao Yakui86e437f2009-06-16 11:23:13 +08001874 if (register_count) {
1875 /*
Rafael J. Wysocki8e5c2b72013-07-25 21:43:39 +02001876 * if the function of acpi_video_register is already called,
1877 * don't register the acpi_vide_bus again and return no error.
Zhao Yakui86e437f2009-06-16 11:23:13 +08001878 */
1879 return 0;
1880 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001881
Aaron Lu67b662e2013-10-11 21:27:44 +08001882 mutex_init(&video_list_lock);
1883 INIT_LIST_HEAD(&video_bus_head);
1884
Linus Torvalds1da177e2005-04-16 15:20:36 -07001885 result = acpi_bus_register_driver(&acpi_video_bus);
Zhang Rui39fe3942010-10-08 13:55:11 +08001886 if (result < 0)
Patrick Mocheld550d982006-06-27 00:41:40 -04001887 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001888
Zhao Yakui86e437f2009-06-16 11:23:13 +08001889 /*
1890 * When the acpi_video_bus is loaded successfully, increase
1891 * the counter reference.
1892 */
1893 register_count = 1;
1894
Patrick Mocheld550d982006-06-27 00:41:40 -04001895 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001896}
Rafael J. Wysocki8e5c2b72013-07-25 21:43:39 +02001897EXPORT_SYMBOL(acpi_video_register);
Matthew Garrett74a365b2009-03-19 21:35:39 +00001898
Zhao Yakui86e437f2009-06-16 11:23:13 +08001899void acpi_video_unregister(void)
1900{
1901 if (!register_count) {
1902 /*
1903 * If the acpi video bus is already unloaded, don't
1904 * unload it again and return directly.
1905 */
1906 return;
1907 }
1908 acpi_bus_unregister_driver(&acpi_video_bus);
1909
Zhao Yakui86e437f2009-06-16 11:23:13 +08001910 register_count = 0;
1911
1912 return;
1913}
1914EXPORT_SYMBOL(acpi_video_unregister);
1915
Matthew Garrett74a365b2009-03-19 21:35:39 +00001916/*
1917 * This is kind of nasty. Hardware using Intel chipsets may require
1918 * the video opregion code to be run first in order to initialise
1919 * state before any ACPI video calls are made. To handle this we defer
1920 * registration of the video class until the opregion code has run.
1921 */
1922
1923static int __init acpi_video_init(void)
1924{
Zhang Rui45cb50e2009-04-24 12:13:18 -04001925 dmi_check_system(video_dmi_table);
1926
Matthew Garrett74a365b2009-03-19 21:35:39 +00001927 if (intel_opregion_present())
1928 return 0;
1929
1930 return acpi_video_register();
1931}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001932
Zhao Yakui86e437f2009-06-16 11:23:13 +08001933static void __exit acpi_video_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001934{
Zhao Yakui86e437f2009-06-16 11:23:13 +08001935 acpi_video_unregister();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001936
Patrick Mocheld550d982006-06-27 00:41:40 -04001937 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001938}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001939
1940module_init(acpi_video_init);
1941module_exit(acpi_video_exit);