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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>
Len Browneb27cae2009-07-06 23:40:19 -040040#include <linux/dmi.h>
Rafael J. Wysockiac7729d2010-04-05 01:43:51 +020041#include <linux/suspend.h>
Lv Zheng8b484632013-12-03 08:49:16 +080042#include <linux/acpi.h>
Matthew Garrette92a7162010-01-12 14:17:03 -050043#include <acpi/video.h>
Lv Zheng8b484632013-12-03 08:49:16 +080044#include <asm/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
Rafael J. Wysocki8c5bd7a2013-07-18 02:08:06 +020046#include "internal.h"
47
Linus Torvalds1da177e2005-04-16 15:20:36 -070048#define ACPI_VIDEO_BUS_NAME "Video Bus"
49#define ACPI_VIDEO_DEVICE_NAME "Video Device"
50#define ACPI_VIDEO_NOTIFY_SWITCH 0x80
51#define ACPI_VIDEO_NOTIFY_PROBE 0x81
52#define ACPI_VIDEO_NOTIFY_CYCLE 0x82
53#define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83
54#define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84
55
Thomas Tuttlef4715182006-12-19 12:56:14 -080056#define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x85
57#define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x86
58#define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x87
59#define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x88
60#define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x89
Linus Torvalds1da177e2005-04-16 15:20:36 -070061
Yu Luming2f3d0002006-11-11 02:40:34 +080062#define MAX_NAME_LEN 20
Linus Torvalds1da177e2005-04-16 15:20:36 -070063
Linus Torvalds1da177e2005-04-16 15:20:36 -070064#define _COMPONENT ACPI_VIDEO_COMPONENT
Len Brownf52fd662007-02-12 22:42:12 -050065ACPI_MODULE_NAME("video");
Linus Torvalds1da177e2005-04-16 15:20:36 -070066
Len Brownf52fd662007-02-12 22:42:12 -050067MODULE_AUTHOR("Bruno Ducrot");
Len Brown7cda93e2007-02-12 23:50:02 -050068MODULE_DESCRIPTION("ACPI Video Driver");
Linus Torvalds1da177e2005-04-16 15:20:36 -070069MODULE_LICENSE("GPL");
70
Rafael J. Wysocki28437682014-07-14 19:35:45 +020071static bool brightness_switch_enabled = 1;
Zhang Rui8a681a42008-01-25 14:47:49 +080072module_param(brightness_switch_enabled, bool, 0644);
73
Zhang Ruic504f8c2009-12-30 15:59:23 +080074/*
75 * By default, we don't allow duplicate ACPI video bus devices
76 * under the same VGA controller
77 */
Rusty Russell90ab5ee2012-01-13 09:32:20 +103078static bool allow_duplicates;
Zhang Ruic504f8c2009-12-30 15:59:23 +080079module_param(allow_duplicates, bool, 0644);
80
Zhang Rui99fd1892010-12-06 15:04:27 +080081/*
Aaron Lu0e9f81d2014-02-18 13:54:20 +080082 * For Windows 8 systems: used to decide if video module
83 * should skip registering backlight interface of its own.
Aaron Lufbc9fe12013-10-11 21:27:45 +080084 */
Hans de Goede25294e92014-08-28 10:20:45 +020085static int use_native_backlight_param = -1;
Aaron Lu0e9f81d2014-02-18 13:54:20 +080086module_param_named(use_native_backlight, use_native_backlight_param, int, 0444);
Hans de Goede25294e92014-08-28 10:20:45 +020087static bool use_native_backlight_dmi = true;
Aaron Lufbc9fe12013-10-11 21:27:45 +080088
Felipe Contreras915ea7e2013-08-03 22:12:50 +020089static int register_count;
Aaron Lu67b662e2013-10-11 21:27:44 +080090static struct mutex video_list_lock;
91static struct list_head video_bus_head;
Len Brown4be44fc2005-08-05 00:44:28 -040092static int acpi_video_bus_add(struct acpi_device *device);
Rafael J. Wysocki51fac832013-01-24 00:24:48 +010093static int acpi_video_bus_remove(struct acpi_device *device);
Bjorn Helgaas70155582009-04-07 15:37:11 +000094static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
Linus Torvalds1da177e2005-04-16 15:20:36 -070095
Thomas Renninger1ba90e32007-07-23 14:44:41 +020096static const struct acpi_device_id video_device_ids[] = {
97 {ACPI_VIDEO_HID, 0},
98 {"", 0},
99};
100MODULE_DEVICE_TABLE(acpi, video_device_ids);
101
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102static struct acpi_driver acpi_video_bus = {
Len Brownc2b67052007-02-12 23:33:40 -0500103 .name = "video",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 .class = ACPI_VIDEO_CLASS,
Thomas Renninger1ba90e32007-07-23 14:44:41 +0200105 .ids = video_device_ids,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 .ops = {
107 .add = acpi_video_bus_add,
108 .remove = acpi_video_bus_remove,
Bjorn Helgaas70155582009-04-07 15:37:11 +0000109 .notify = acpi_video_bus_notify,
Len Brown4be44fc2005-08-05 00:44:28 -0400110 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111};
112
113struct acpi_video_bus_flags {
Len Brown4be44fc2005-08-05 00:44:28 -0400114 u8 multihead:1; /* can switch video heads */
115 u8 rom:1; /* can retrieve a video rom */
116 u8 post:1; /* can configure the head to */
117 u8 reserved:5;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118};
119
120struct acpi_video_bus_cap {
Felipe Contreras21fcb342013-08-01 18:43:59 -0500121 u8 _DOS:1; /* Enable/Disable output switching */
122 u8 _DOD:1; /* Enumerate all devices attached to display adapter */
123 u8 _ROM:1; /* Get ROM Data */
124 u8 _GPD:1; /* Get POST Device */
125 u8 _SPD:1; /* Set POST Device */
126 u8 _VPO:1; /* Video POST Options */
Len Brown4be44fc2005-08-05 00:44:28 -0400127 u8 reserved:2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128};
129
Len Brown4be44fc2005-08-05 00:44:28 -0400130struct acpi_video_device_attrib {
131 u32 display_index:4; /* A zero-based instance of the Display */
Felipe Contreras21fcb342013-08-01 18:43:59 -0500132 u32 display_port_attachment:4; /* This field differentiates the display type */
133 u32 display_type:4; /* Describe the specific type in use */
134 u32 vendor_specific:4; /* Chipset Vendor Specific */
135 u32 bios_can_detect:1; /* BIOS can detect the device */
136 u32 depend_on_vga:1; /* Non-VGA output device whose power is related to
Len Brown4be44fc2005-08-05 00:44:28 -0400137 the VGA device. */
Felipe Contreras21fcb342013-08-01 18:43:59 -0500138 u32 pipe_id:3; /* For VGA multiple-head devices. */
139 u32 reserved:10; /* Must be 0 */
140 u32 device_id_scheme:1; /* Device ID Scheme */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141};
142
143struct acpi_video_enumerated_device {
144 union {
145 u32 int_val;
Len Brown4be44fc2005-08-05 00:44:28 -0400146 struct acpi_video_device_attrib attrib;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 } value;
148 struct acpi_video_device *bind_info;
149};
150
151struct acpi_video_bus {
Patrick Mochele6afa0d2006-05-19 16:54:40 -0400152 struct acpi_device *device;
Hans de Goede99678ed2014-05-15 13:22:33 +0200153 bool backlight_registered;
Hans de Goede53a92ba2014-05-21 15:39:55 +0200154 bool backlight_notifier_registered;
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;
Hans de Goede53a92ba2014-05-21 15:39:55 +0200166 struct notifier_block backlight_nb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167};
168
169struct acpi_video_device_flags {
Len Brown4be44fc2005-08-05 00:44:28 -0400170 u8 crt:1;
171 u8 lcd:1;
172 u8 tvout:1;
Rui Zhang82cae992007-01-03 23:40:53 -0500173 u8 dvi:1;
Len Brown4be44fc2005-08-05 00:44:28 -0400174 u8 bios:1;
175 u8 unknown:1;
Aaron Lu91e13aa2013-04-25 02:47:49 +0000176 u8 notify:1;
177 u8 reserved:1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178};
179
180struct acpi_video_device_cap {
Felipe Contreras21fcb342013-08-01 18:43:59 -0500181 u8 _ADR:1; /* Return the unique ID */
182 u8 _BCL:1; /* Query list of brightness control levels supported */
183 u8 _BCM:1; /* Set the brightness level */
Yu Luming2f3d0002006-11-11 02:40:34 +0800184 u8 _BQC:1; /* Get current brightness level */
Zhang Ruic60d6382009-03-18 16:27:18 +0800185 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
Felipe Contreras21fcb342013-08-01 18:43:59 -0500186 u8 _DDC:1; /* Return the EDID for this device */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187};
188
Zhang Ruid32f6942009-03-18 16:27:12 +0800189struct acpi_video_brightness_flags {
190 u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
Felipe Contreras21fcb342013-08-01 18:43:59 -0500191 u8 _BCL_reversed:1; /* _BCL package is in a reversed order */
Zhang Rui1a7c6182009-03-18 16:27:16 +0800192 u8 _BQC_use_index:1; /* _BQC returns an index value */
Zhang Ruid32f6942009-03-18 16:27:12 +0800193};
194
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195struct acpi_video_device_brightness {
Len Brown4be44fc2005-08-05 00:44:28 -0400196 int curr;
197 int count;
198 int *levels;
Zhang Ruid32f6942009-03-18 16:27:12 +0800199 struct acpi_video_brightness_flags flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200};
201
202struct acpi_video_device {
Len Brown4be44fc2005-08-05 00:44:28 -0400203 unsigned long device_id;
204 struct acpi_video_device_flags flags;
205 struct acpi_video_device_cap cap;
206 struct list_head entry;
Linus Torvalds8ab58e82014-07-18 14:32:51 +0200207 struct delayed_work switch_brightness_work;
208 int switch_brightness_event;
Len Brown4be44fc2005-08-05 00:44:28 -0400209 struct acpi_video_bus *video;
210 struct acpi_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 struct acpi_video_device_brightness *brightness;
Yu Luming2f3d0002006-11-11 02:40:34 +0800212 struct backlight_device *backlight;
Dmitry Torokhov4a703a82009-08-29 23:03:16 -0400213 struct thermal_cooling_device *cooling_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214};
215
Jan Engelhardtb7171ae2009-01-12 00:08:19 +0100216static const char device_decode[][30] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 "motherboard VGA device",
218 "PCI VGA device",
219 "AGP VGA device",
220 "UNKNOWN",
221};
222
Len Brown4be44fc2005-08-05 00:44:28 -0400223static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
224static void acpi_video_device_rebind(struct acpi_video_bus *video);
225static void acpi_video_device_bind(struct acpi_video_bus *video,
226 struct acpi_video_device *device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227static int acpi_video_device_enumerate(struct acpi_video_bus *video);
Yu Luming2f3d0002006-11-11 02:40:34 +0800228static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
229 int level);
230static int acpi_video_device_lcd_get_level_current(
231 struct acpi_video_device *device,
Danny Baumanna89803d2013-03-19 16:22:50 +0000232 unsigned long long *level, bool raw);
Len Brown4be44fc2005-08-05 00:44:28 -0400233static int acpi_video_get_next_level(struct acpi_video_device *device,
234 u32 level_current, u32 event);
Linus Torvalds8ab58e82014-07-18 14:32:51 +0200235static void acpi_video_switch_brightness(struct work_struct *work);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236
Aaron Lu0e9f81d2014-02-18 13:54:20 +0800237static bool acpi_video_use_native_backlight(void)
238{
239 if (use_native_backlight_param != -1)
240 return use_native_backlight_param;
241 else
242 return use_native_backlight_dmi;
243}
244
Aaron Lu0b9f7d92014-07-07 15:43:51 +0800245bool acpi_video_verify_backlight_support(void)
Aaron Lufbc9fe12013-10-11 21:27:45 +0800246{
Aaron Lu0e9f81d2014-02-18 13:54:20 +0800247 if (acpi_osi_is_win8() && acpi_video_use_native_backlight() &&
Aaron Lufbc9fe12013-10-11 21:27:45 +0800248 backlight_device_registered(BACKLIGHT_RAW))
249 return false;
250 return acpi_video_backlight_support();
251}
Aaron Lu0b9f7d92014-07-07 15:43:51 +0800252EXPORT_SYMBOL_GPL(acpi_video_verify_backlight_support);
Aaron Lufbc9fe12013-10-11 21:27:45 +0800253
Felipe Contreras21fcb342013-08-01 18:43:59 -0500254/* backlight device sysfs support */
Yu Luming2f3d0002006-11-11 02:40:34 +0800255static int acpi_video_get_brightness(struct backlight_device *bd)
256{
Matthew Wilcox27663c52008-10-10 02:22:59 -0400257 unsigned long long cur_level;
Matthew Garrett38531e62007-12-26 02:03:26 +0000258 int i;
Felipe Contreras7c364e72013-08-03 22:15:21 +0200259 struct acpi_video_device *vd = bl_get_data(bd);
Zhang Ruic8890f92009-03-18 16:27:08 +0800260
Danny Baumanna89803d2013-03-19 16:22:50 +0000261 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
Zhang Ruic8890f92009-03-18 16:27:08 +0800262 return -EINVAL;
Matthew Garrett38531e62007-12-26 02:03:26 +0000263 for (i = 2; i < vd->brightness->count; i++) {
264 if (vd->brightness->levels[i] == cur_level)
Felipe Contreras21fcb342013-08-01 18:43:59 -0500265 /*
266 * The first two entries are special - see page 575
267 * of the ACPI spec 3.0
268 */
Felipe Contreras915ea7e2013-08-03 22:12:50 +0200269 return i - 2;
Matthew Garrett38531e62007-12-26 02:03:26 +0000270 }
271 return 0;
Yu Luming2f3d0002006-11-11 02:40:34 +0800272}
273
274static int acpi_video_set_brightness(struct backlight_device *bd)
275{
Zhang Rui24450c72009-03-18 16:27:10 +0800276 int request_level = bd->props.brightness + 2;
Felipe Contreras7c364e72013-08-03 22:15:21 +0200277 struct acpi_video_device *vd = bl_get_data(bd);
Zhang Rui24450c72009-03-18 16:27:10 +0800278
Linus Torvalds8ab58e82014-07-18 14:32:51 +0200279 cancel_delayed_work(&vd->switch_brightness_work);
Zhang Rui24450c72009-03-18 16:27:10 +0800280 return acpi_video_device_lcd_set_level(vd,
281 vd->brightness->levels[request_level]);
Yu Luming2f3d0002006-11-11 02:40:34 +0800282}
283
Lionel Debrouxacc24722010-11-16 14:14:02 +0100284static const struct backlight_ops acpi_backlight_ops = {
Richard Purdie599a52d2007-02-10 23:07:48 +0000285 .get_brightness = acpi_video_get_brightness,
286 .update_status = acpi_video_set_brightness,
287};
288
Zhang Rui702ed512008-01-17 15:51:22 +0800289/* thermal cooling device callbacks */
Dmitry Torokhov4a703a82009-08-29 23:03:16 -0400290static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
Matthew Garrett6503e5d2008-11-27 17:48:13 +0000291 long *state)
Zhang Rui702ed512008-01-17 15:51:22 +0800292{
Dmitry Torokhov4a703a82009-08-29 23:03:16 -0400293 struct acpi_device *device = cooling_dev->devdata;
Zhang Rui702ed512008-01-17 15:51:22 +0800294 struct acpi_video_device *video = acpi_driver_data(device);
295
Matthew Garrett6503e5d2008-11-27 17:48:13 +0000296 *state = video->brightness->count - 3;
297 return 0;
Zhang Rui702ed512008-01-17 15:51:22 +0800298}
299
Dmitry Torokhov4a703a82009-08-29 23:03:16 -0400300static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
Matthew Garrett6503e5d2008-11-27 17:48:13 +0000301 long *state)
Zhang Rui702ed512008-01-17 15:51:22 +0800302{
Dmitry Torokhov4a703a82009-08-29 23:03:16 -0400303 struct acpi_device *device = cooling_dev->devdata;
Zhang Rui702ed512008-01-17 15:51:22 +0800304 struct acpi_video_device *video = acpi_driver_data(device);
Matthew Wilcox27663c52008-10-10 02:22:59 -0400305 unsigned long long level;
Matthew Garrett6503e5d2008-11-27 17:48:13 +0000306 int offset;
Zhang Rui702ed512008-01-17 15:51:22 +0800307
Danny Baumanna89803d2013-03-19 16:22:50 +0000308 if (acpi_video_device_lcd_get_level_current(video, &level, false))
Zhang Ruic8890f92009-03-18 16:27:08 +0800309 return -EINVAL;
Matthew Garrett6503e5d2008-11-27 17:48:13 +0000310 for (offset = 2; offset < video->brightness->count; offset++)
311 if (level == video->brightness->levels[offset]) {
312 *state = video->brightness->count - offset - 1;
313 return 0;
314 }
Zhang Rui702ed512008-01-17 15:51:22 +0800315
316 return -EINVAL;
317}
318
319static int
Dmitry Torokhov4a703a82009-08-29 23:03:16 -0400320video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
Zhang Rui702ed512008-01-17 15:51:22 +0800321{
Dmitry Torokhov4a703a82009-08-29 23:03:16 -0400322 struct acpi_device *device = cooling_dev->devdata;
Zhang Rui702ed512008-01-17 15:51:22 +0800323 struct acpi_video_device *video = acpi_driver_data(device);
324 int level;
325
Felipe Contreras915ea7e2013-08-03 22:12:50 +0200326 if (state >= video->brightness->count - 2)
Zhang Rui702ed512008-01-17 15:51:22 +0800327 return -EINVAL;
328
329 state = video->brightness->count - state;
Felipe Contreras915ea7e2013-08-03 22:12:50 +0200330 level = video->brightness->levels[state - 1];
Zhang Rui702ed512008-01-17 15:51:22 +0800331 return acpi_video_device_lcd_set_level(video, level);
332}
333
Vasiliy Kulikov9c8b04b2011-06-25 21:07:52 +0400334static const struct thermal_cooling_device_ops video_cooling_ops = {
Zhang Rui702ed512008-01-17 15:51:22 +0800335 .get_max_state = video_get_max_state,
336 .get_cur_state = video_get_cur_state,
337 .set_cur_state = video_set_cur_state,
338};
339
Felipe Contreras21fcb342013-08-01 18:43:59 -0500340/*
341 * --------------------------------------------------------------------------
342 * Video Management
343 * --------------------------------------------------------------------------
344 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346static int
Len Brown4be44fc2005-08-05 00:44:28 -0400347acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
348 union acpi_object **levels)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349{
Len Brown4be44fc2005-08-05 00:44:28 -0400350 int status;
351 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
352 union acpi_object *obj;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354
355 *levels = NULL;
356
Patrick Mochel90130262006-05-19 16:54:48 -0400357 status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 if (!ACPI_SUCCESS(status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400359 return status;
Len Brown4be44fc2005-08-05 00:44:28 -0400360 obj = (union acpi_object *)buffer.pointer;
Adrian Bunk6665bda2006-03-11 10:12:00 -0500361 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
Len Brown64684632006-06-26 23:41:38 -0400362 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 status = -EFAULT;
364 goto err;
365 }
366
367 *levels = obj;
368
Patrick Mocheld550d982006-06-27 00:41:40 -0400369 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370
Felipe Contreras915ea7e2013-08-03 22:12:50 +0200371err:
Jesper Juhl6044ec82005-11-07 01:01:32 -0800372 kfree(buffer.pointer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373
Patrick Mocheld550d982006-06-27 00:41:40 -0400374 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375}
376
377static int
Len Brown4be44fc2005-08-05 00:44:28 -0400378acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379{
Zhang Rui24450c72009-03-18 16:27:10 +0800380 int status;
Zhang Rui9e6dada2008-12-31 10:58:48 +0800381 int state;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382
Jiang Liu0db98202013-06-29 00:24:39 +0800383 status = acpi_execute_simple_method(device->dev->handle,
384 "_BCM", level);
Zhang Rui24450c72009-03-18 16:27:10 +0800385 if (ACPI_FAILURE(status)) {
386 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
387 return -EIO;
388 }
389
Alexey Starikovskiy4500ca82007-09-03 16:29:58 +0400390 device->brightness->curr = level;
Zhang Rui9e6dada2008-12-31 10:58:48 +0800391 for (state = 2; state < device->brightness->count; state++)
Zhang Rui24450c72009-03-18 16:27:10 +0800392 if (level == device->brightness->levels[state]) {
Zhang Rui1a7c6182009-03-18 16:27:16 +0800393 if (device->backlight)
394 device->backlight->props.brightness = state - 2;
Zhang Rui24450c72009-03-18 16:27:10 +0800395 return 0;
396 }
Zhang Rui9e6dada2008-12-31 10:58:48 +0800397
Zhang Rui24450c72009-03-18 16:27:10 +0800398 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
399 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400}
401
Zhang Rui45cb50e2009-04-24 12:13:18 -0400402/*
403 * For some buggy _BQC methods, we need to add a constant value to
404 * the _BQC return value to get the actual current brightness level
405 */
406
407static int bqc_offset_aml_bug_workaround;
408static int __init video_set_bqc_offset(const struct dmi_system_id *d)
409{
410 bqc_offset_aml_bug_workaround = 9;
411 return 0;
412}
413
Hans de Goede5f240792014-08-28 10:20:46 +0200414static int __init video_disable_native_backlight(const struct dmi_system_id *d)
415{
416 use_native_backlight_dmi = false;
417 return 0;
418}
419
Zhang Rui45cb50e2009-04-24 12:13:18 -0400420static struct dmi_system_id video_dmi_table[] __initdata = {
421 /*
422 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
423 */
424 {
425 .callback = video_set_bqc_offset,
426 .ident = "Acer Aspire 5720",
427 .matches = {
428 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
429 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
430 },
431 },
Len Brown5afc4ab2009-05-07 21:11:56 -0400432 {
433 .callback = video_set_bqc_offset,
434 .ident = "Acer Aspire 5710Z",
435 .matches = {
436 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
437 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
438 },
439 },
Zhang Rui34ac2722009-05-26 23:35:34 -0400440 {
441 .callback = video_set_bqc_offset,
442 .ident = "eMachines E510",
443 .matches = {
444 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
445 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
446 },
447 },
Zhang Rui93bcece2009-05-19 15:08:41 -0400448 {
449 .callback = video_set_bqc_offset,
450 .ident = "Acer Aspire 5315",
451 .matches = {
452 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
453 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
454 },
455 },
Zhang Rui152a4e62009-06-22 11:31:18 +0800456 {
457 .callback = video_set_bqc_offset,
458 .ident = "Acer Aspire 7720",
459 .matches = {
460 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
461 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
462 },
463 },
Hans de Goede5f240792014-08-28 10:20:46 +0200464
465 /*
466 * These models have a working acpi_video backlight control, and using
467 * native backlight causes a regression where backlight does not work
468 * when userspace is not handling brightness key events. Disable
469 * native_backlight on these to fix this:
470 * https://bugzilla.kernel.org/show_bug.cgi?id=81691
471 */
472 {
473 .callback = video_disable_native_backlight,
474 .ident = "ThinkPad T420",
475 .matches = {
476 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
477 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"),
478 },
479 },
480 {
481 .callback = video_disable_native_backlight,
482 .ident = "ThinkPad T520",
483 .matches = {
484 DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
485 DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"),
486 },
487 },
Hans de Goede84c34852014-08-28 10:20:47 +0200488
489 /* The native backlight controls do not work on some older machines */
490 {
491 /* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */
492 .callback = video_disable_native_backlight,
493 .ident = "HP ENVY 15 Notebook",
494 .matches = {
495 DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
496 DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"),
497 },
498 },
Zhang Rui45cb50e2009-04-24 12:13:18 -0400499 {}
500};
501
Danny Baumann994fa632013-03-19 16:22:52 +0000502static unsigned long long
503acpi_video_bqc_value_to_level(struct acpi_video_device *device,
504 unsigned long long bqc_value)
505{
506 unsigned long long level;
507
508 if (device->brightness->flags._BQC_use_index) {
509 /*
510 * _BQC returns an index that doesn't account for
511 * the first 2 items with special meaning, so we need
512 * to compensate for that by offsetting ourselves
513 */
514 if (device->brightness->flags._BCL_reversed)
515 bqc_value = device->brightness->count - 3 - bqc_value;
516
517 level = device->brightness->levels[bqc_value + 2];
518 } else {
519 level = bqc_value;
520 }
521
522 level += bqc_offset_aml_bug_workaround;
523
524 return level;
525}
526
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527static int
Len Brown4be44fc2005-08-05 00:44:28 -0400528acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
Danny Baumanna89803d2013-03-19 16:22:50 +0000529 unsigned long long *level, bool raw)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530{
Zhang Ruic8890f92009-03-18 16:27:08 +0800531 acpi_status status = AE_OK;
Vladimir Serbinenko4e231fa2009-06-24 15:17:36 +0800532 int i;
Zhang Ruic8890f92009-03-18 16:27:08 +0800533
Zhang Ruic60d6382009-03-18 16:27:18 +0800534 if (device->cap._BQC || device->cap._BCQ) {
535 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
536
537 status = acpi_evaluate_integer(device->dev->handle, buf,
Zhang Ruic8890f92009-03-18 16:27:08 +0800538 NULL, level);
539 if (ACPI_SUCCESS(status)) {
Danny Baumanna89803d2013-03-19 16:22:50 +0000540 if (raw) {
541 /*
542 * Caller has indicated he wants the raw
543 * value returned by _BQC, so don't furtherly
544 * mess with the value.
545 */
546 return 0;
547 }
548
Danny Baumann994fa632013-03-19 16:22:52 +0000549 *level = acpi_video_bqc_value_to_level(device, *level);
Zhang Rui1a7c6182009-03-18 16:27:16 +0800550
Vladimir Serbinenko4e231fa2009-06-24 15:17:36 +0800551 for (i = 2; i < device->brightness->count; i++)
552 if (device->brightness->levels[i] == *level) {
553 device->brightness->curr = *level;
554 return 0;
Felipe Contreras915ea7e2013-08-03 22:12:50 +0200555 }
Danny Baumanna89803d2013-03-19 16:22:50 +0000556 /*
557 * BQC returned an invalid level.
558 * Stop using it.
559 */
560 ACPI_WARNING((AE_INFO,
561 "%s returned an invalid level",
562 buf));
563 device->cap._BQC = device->cap._BCQ = 0;
Zhang Ruic8890f92009-03-18 16:27:08 +0800564 } else {
Felipe Contreras21fcb342013-08-01 18:43:59 -0500565 /*
566 * Fixme:
Zhang Ruic8890f92009-03-18 16:27:08 +0800567 * should we return an error or ignore this failure?
568 * dev->brightness->curr is a cached value which stores
569 * the correct current backlight level in most cases.
570 * ACPI video backlight still works w/ buggy _BQC.
571 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
572 */
Zhang Ruic60d6382009-03-18 16:27:18 +0800573 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
574 device->cap._BQC = device->cap._BCQ = 0;
Zhang Ruic8890f92009-03-18 16:27:08 +0800575 }
576 }
577
Alexey Starikovskiy4500ca82007-09-03 16:29:58 +0400578 *level = device->brightness->curr;
Zhang Ruic8890f92009-03-18 16:27:08 +0800579 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580}
581
582static int
Len Brown4be44fc2005-08-05 00:44:28 -0400583acpi_video_device_EDID(struct acpi_video_device *device,
584 union acpi_object **edid, ssize_t length)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585{
Len Brown4be44fc2005-08-05 00:44:28 -0400586 int status;
587 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
588 union acpi_object *obj;
589 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
590 struct acpi_object_list args = { 1, &arg0 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592
593 *edid = NULL;
594
595 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400596 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597 if (length == 128)
598 arg0.integer.value = 1;
599 else if (length == 256)
600 arg0.integer.value = 2;
601 else
Patrick Mocheld550d982006-06-27 00:41:40 -0400602 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603
Patrick Mochel90130262006-05-19 16:54:48 -0400604 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400606 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200608 obj = buffer.pointer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609
610 if (obj && obj->type == ACPI_TYPE_BUFFER)
611 *edid = obj;
612 else {
Len Brown64684632006-06-26 23:41:38 -0400613 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 status = -EFAULT;
615 kfree(obj);
616 }
617
Patrick Mocheld550d982006-06-27 00:41:40 -0400618 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619}
620
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621/* bus */
622
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623/*
624 * Arg:
Felipe Contreras21fcb342013-08-01 18:43:59 -0500625 * video : video bus device pointer
626 * bios_flag :
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627 * 0. The system BIOS should NOT automatically switch(toggle)
628 * the active display output.
629 * 1. The system BIOS should automatically switch (toggle) the
Julius Volz98fb8fe2007-02-20 16:38:40 +0100630 * active display output. No switch event.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631 * 2. The _DGS value should be locked.
632 * 3. The system BIOS should not automatically switch (toggle) the
633 * active display output, but instead generate the display switch
634 * event notify code.
635 * lcd_flag :
636 * 0. The system BIOS should automatically control the brightness level
Julius Volz98fb8fe2007-02-20 16:38:40 +0100637 * of the LCD when the power changes from AC to DC
Felipe Contreras21fcb342013-08-01 18:43:59 -0500638 * 1. The system BIOS should NOT automatically control the brightness
Julius Volz98fb8fe2007-02-20 16:38:40 +0100639 * level of the LCD when the power changes from AC to DC.
Felipe Contreras21fcb342013-08-01 18:43:59 -0500640 * Return Value:
Igor Murzovea9f8852012-03-30 21:32:08 +0400641 * -EINVAL wrong arg.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642 */
643
644static int
Len Brown4be44fc2005-08-05 00:44:28 -0400645acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646{
Igor Murzovea9f8852012-03-30 21:32:08 +0400647 acpi_status status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648
Zhang Ruib0373842012-06-20 09:48:43 +0800649 if (!video->cap._DOS)
650 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651
Igor Murzovea9f8852012-03-30 21:32:08 +0400652 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
653 return -EINVAL;
Jiang Liu0db98202013-06-29 00:24:39 +0800654 video->dos_setting = (lcd_flag << 2) | bios_flag;
655 status = acpi_execute_simple_method(video->device->handle, "_DOS",
656 (lcd_flag << 2) | bios_flag);
Igor Murzovea9f8852012-03-30 21:32:08 +0400657 if (ACPI_FAILURE(status))
658 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659
Igor Murzovea9f8852012-03-30 21:32:08 +0400660 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661}
662
663/*
Zhang Rui935e5f22008-12-11 16:24:52 -0500664 * Simple comparison function used to sort backlight levels.
665 */
666
667static int
668acpi_video_cmp_level(const void *a, const void *b)
669{
670 return *(int *)a - *(int *)b;
671}
672
673/*
Aaron Lua50188d2013-04-22 14:08:32 +0200674 * Decides if _BQC/_BCQ for this system is usable
675 *
676 * We do this by changing the level first and then read out the current
677 * brightness level, if the value does not match, find out if it is using
678 * index. If not, clear the _BQC/_BCQ capability.
679 */
680static int acpi_video_bqc_quirk(struct acpi_video_device *device,
681 int max_level, int current_level)
682{
683 struct acpi_video_device_brightness *br = device->brightness;
684 int result;
685 unsigned long long level;
686 int test_level;
687
688 /* don't mess with existing known broken systems */
689 if (bqc_offset_aml_bug_workaround)
690 return 0;
691
692 /*
693 * Some systems always report current brightness level as maximum
694 * through _BQC, we need to test another value for them.
695 */
Felipe Contrerasb3b301c2013-08-03 23:00:25 +0200696 test_level = current_level == max_level ? br->levels[3] : max_level;
Aaron Lua50188d2013-04-22 14:08:32 +0200697
698 result = acpi_video_device_lcd_set_level(device, test_level);
699 if (result)
700 return result;
701
702 result = acpi_video_device_lcd_get_level_current(device, &level, true);
703 if (result)
704 return result;
705
706 if (level != test_level) {
707 /* buggy _BQC found, need to find out if it uses index */
708 if (level < br->count) {
709 if (br->flags._BCL_reversed)
710 level = br->count - 3 - level;
711 if (br->levels[level + 2] == test_level)
712 br->flags._BQC_use_index = 1;
713 }
714
715 if (!br->flags._BQC_use_index)
716 device->cap._BQC = device->cap._BCQ = 0;
717 }
718
719 return 0;
720}
721
722
723/*
Felipe Contreras21fcb342013-08-01 18:43:59 -0500724 * Arg:
725 * device : video output device (LCD, CRT, ..)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726 *
727 * Return Value:
Julia Jomantaite469778c2008-06-23 22:50:42 +0100728 * Maximum brightness level
729 *
730 * Allocate and initialize device->brightness.
731 */
732
733static int
734acpi_video_init_brightness(struct acpi_video_device *device)
735{
736 union acpi_object *obj = NULL;
Zhang Ruid32f6942009-03-18 16:27:12 +0800737 int i, max_level = 0, count = 0, level_ac_battery = 0;
Zhang Rui1a7c6182009-03-18 16:27:16 +0800738 unsigned long long level, level_old;
Julia Jomantaite469778c2008-06-23 22:50:42 +0100739 union acpi_object *o;
740 struct acpi_video_device_brightness *br = NULL;
Zhang Rui1a7c6182009-03-18 16:27:16 +0800741 int result = -EINVAL;
Hans de Goedebd8ba202014-02-13 16:32:51 +0100742 u32 value;
Julia Jomantaite469778c2008-06-23 22:50:42 +0100743
744 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
745 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
746 "LCD brightness level\n"));
747 goto out;
748 }
749
750 if (obj->package.count < 2)
751 goto out;
752
753 br = kzalloc(sizeof(*br), GFP_KERNEL);
754 if (!br) {
755 printk(KERN_ERR "can't allocate memory\n");
Zhang Rui1a7c6182009-03-18 16:27:16 +0800756 result = -ENOMEM;
Julia Jomantaite469778c2008-06-23 22:50:42 +0100757 goto out;
758 }
759
Zhang Ruid32f6942009-03-18 16:27:12 +0800760 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
Julia Jomantaite469778c2008-06-23 22:50:42 +0100761 GFP_KERNEL);
Zhang Rui1a7c6182009-03-18 16:27:16 +0800762 if (!br->levels) {
763 result = -ENOMEM;
Julia Jomantaite469778c2008-06-23 22:50:42 +0100764 goto out_free;
Zhang Rui1a7c6182009-03-18 16:27:16 +0800765 }
Julia Jomantaite469778c2008-06-23 22:50:42 +0100766
767 for (i = 0; i < obj->package.count; i++) {
768 o = (union acpi_object *)&obj->package.elements[i];
769 if (o->type != ACPI_TYPE_INTEGER) {
770 printk(KERN_ERR PREFIX "Invalid data\n");
771 continue;
772 }
Hans de Goedebd8ba202014-02-13 16:32:51 +0100773 value = (u32) o->integer.value;
774 /* Skip duplicate entries */
775 if (count > 2 && br->levels[count - 1] == value)
776 continue;
777
778 br->levels[count] = value;
Julia Jomantaite469778c2008-06-23 22:50:42 +0100779
780 if (br->levels[count] > max_level)
781 max_level = br->levels[count];
782 count++;
783 }
784
Zhang Ruid32f6942009-03-18 16:27:12 +0800785 /*
786 * some buggy BIOS don't export the levels
787 * when machine is on AC/Battery in _BCL package.
788 * In this case, the first two elements in _BCL packages
789 * are also supported brightness levels that OS should take care of.
790 */
Zhang Rui90af2cf2009-04-14 11:02:18 +0800791 for (i = 2; i < count; i++) {
792 if (br->levels[i] == br->levels[0])
Zhang Ruid32f6942009-03-18 16:27:12 +0800793 level_ac_battery++;
Zhang Rui90af2cf2009-04-14 11:02:18 +0800794 if (br->levels[i] == br->levels[1])
795 level_ac_battery++;
796 }
Zhang Rui935e5f22008-12-11 16:24:52 -0500797
Zhang Ruid32f6942009-03-18 16:27:12 +0800798 if (level_ac_battery < 2) {
799 level_ac_battery = 2 - level_ac_battery;
800 br->flags._BCL_no_ac_battery_levels = 1;
801 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
802 br->levels[i] = br->levels[i - level_ac_battery];
803 count += level_ac_battery;
804 } else if (level_ac_battery > 2)
Colin Ian Kingbf6787e2012-11-29 11:53:13 +0000805 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
Zhang Ruid32f6942009-03-18 16:27:12 +0800806
Zhang Ruid80fb992009-03-18 16:27:14 +0800807 /* Check if the _BCL package is in a reversed order */
808 if (max_level == br->levels[2]) {
809 br->flags._BCL_reversed = 1;
810 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
811 acpi_video_cmp_level, NULL);
812 } else if (max_level != br->levels[count - 1])
813 ACPI_ERROR((AE_INFO,
Colin Ian Kingbf6787e2012-11-29 11:53:13 +0000814 "Found unordered _BCL package"));
Julia Jomantaite469778c2008-06-23 22:50:42 +0100815
816 br->count = count;
817 device->brightness = br;
Zhang Rui1a7c6182009-03-18 16:27:16 +0800818
Zhang Rui1a7c6182009-03-18 16:27:16 +0800819 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
Zhang Rui90c53ca2009-08-31 12:39:54 -0400820 br->curr = level = max_level;
Zhang Ruie047cca2009-04-09 14:24:35 +0800821
822 if (!device->cap._BQC)
823 goto set_level;
824
Danny Baumanna89803d2013-03-19 16:22:50 +0000825 result = acpi_video_device_lcd_get_level_current(device,
826 &level_old, true);
Zhang Rui1a7c6182009-03-18 16:27:16 +0800827 if (result)
828 goto out_free_levels;
829
Aaron Lua50188d2013-04-22 14:08:32 +0200830 result = acpi_video_bqc_quirk(device, max_level, level_old);
831 if (result)
832 goto out_free_levels;
Zhang Ruie047cca2009-04-09 14:24:35 +0800833 /*
Aaron Lua50188d2013-04-22 14:08:32 +0200834 * cap._BQC may get cleared due to _BQC is found to be broken
835 * in acpi_video_bqc_quirk, so check again here.
Zhang Ruie047cca2009-04-09 14:24:35 +0800836 */
Aaron Lua50188d2013-04-22 14:08:32 +0200837 if (!device->cap._BQC)
838 goto set_level;
Zhang Rui1a7c6182009-03-18 16:27:16 +0800839
Aaron Lu545ef362013-11-15 14:39:12 +0800840 level = acpi_video_bqc_value_to_level(device, level_old);
841 /*
842 * On some buggy laptops, _BQC returns an uninitialized
843 * value when invoked for the first time, i.e.
844 * level_old is invalid (no matter whether it's a level
845 * or an index). Set the backlight to max_level in this case.
846 */
847 for (i = 2; i < br->count; i++)
848 if (level == br->levels[i])
849 break;
850 if (i == br->count || !level)
851 level = max_level;
Zhang Ruie047cca2009-04-09 14:24:35 +0800852
Zhang Ruie047cca2009-04-09 14:24:35 +0800853set_level:
Zhang Rui90c53ca2009-08-31 12:39:54 -0400854 result = acpi_video_device_lcd_set_level(device, level);
Zhang Ruie047cca2009-04-09 14:24:35 +0800855 if (result)
856 goto out_free_levels;
Zhang Rui1a7c6182009-03-18 16:27:16 +0800857
Zhang Ruid32f6942009-03-18 16:27:12 +0800858 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
859 "found %d brightness levels\n", count - 2));
Julia Jomantaite469778c2008-06-23 22:50:42 +0100860 kfree(obj);
Zhang Rui1a7c6182009-03-18 16:27:16 +0800861 return result;
Julia Jomantaite469778c2008-06-23 22:50:42 +0100862
863out_free_levels:
864 kfree(br->levels);
865out_free:
866 kfree(br);
867out:
868 device->brightness = NULL;
869 kfree(obj);
Zhang Rui1a7c6182009-03-18 16:27:16 +0800870 return result;
Julia Jomantaite469778c2008-06-23 22:50:42 +0100871}
872
873/*
874 * Arg:
875 * device : video output device (LCD, CRT, ..)
876 *
877 * Return Value:
Felipe Contreras21fcb342013-08-01 18:43:59 -0500878 * None
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879 *
Julius Volz98fb8fe2007-02-20 16:38:40 +0100880 * Find out all required AML methods defined under the output
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881 * device.
882 */
883
Len Brown4be44fc2005-08-05 00:44:28 -0400884static void acpi_video_device_find_cap(struct acpi_video_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885{
Jiang Liu952c63e2013-06-29 00:24:38 +0800886 if (acpi_has_method(device->dev->handle, "_ADR"))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887 device->cap._ADR = 1;
Jiang Liu952c63e2013-06-29 00:24:38 +0800888 if (acpi_has_method(device->dev->handle, "_BCL"))
Len Brown4be44fc2005-08-05 00:44:28 -0400889 device->cap._BCL = 1;
Jiang Liu952c63e2013-06-29 00:24:38 +0800890 if (acpi_has_method(device->dev->handle, "_BCM"))
Len Brown4be44fc2005-08-05 00:44:28 -0400891 device->cap._BCM = 1;
Jiang Liu952c63e2013-06-29 00:24:38 +0800892 if (acpi_has_method(device->dev->handle, "_BQC")) {
Yu Luming2f3d0002006-11-11 02:40:34 +0800893 device->cap._BQC = 1;
Jiang Liu952c63e2013-06-29 00:24:38 +0800894 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
Zhang Ruic60d6382009-03-18 16:27:18 +0800895 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
896 device->cap._BCQ = 1;
897 }
898
Jiang Liu952c63e2013-06-29 00:24:38 +0800899 if (acpi_has_method(device->dev->handle, "_DDC"))
Len Brown4be44fc2005-08-05 00:44:28 -0400900 device->cap._DDC = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901}
902
903/*
Felipe Contreras21fcb342013-08-01 18:43:59 -0500904 * Arg:
905 * device : video output device (VGA)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906 *
907 * Return Value:
Felipe Contreras21fcb342013-08-01 18:43:59 -0500908 * None
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909 *
Julius Volz98fb8fe2007-02-20 16:38:40 +0100910 * Find out all required AML methods defined under the video bus device.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700911 */
912
Len Brown4be44fc2005-08-05 00:44:28 -0400913static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914{
Jiang Liu952c63e2013-06-29 00:24:38 +0800915 if (acpi_has_method(video->device->handle, "_DOS"))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916 video->cap._DOS = 1;
Jiang Liu952c63e2013-06-29 00:24:38 +0800917 if (acpi_has_method(video->device->handle, "_DOD"))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918 video->cap._DOD = 1;
Jiang Liu952c63e2013-06-29 00:24:38 +0800919 if (acpi_has_method(video->device->handle, "_ROM"))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920 video->cap._ROM = 1;
Jiang Liu952c63e2013-06-29 00:24:38 +0800921 if (acpi_has_method(video->device->handle, "_GPD"))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922 video->cap._GPD = 1;
Jiang Liu952c63e2013-06-29 00:24:38 +0800923 if (acpi_has_method(video->device->handle, "_SPD"))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700924 video->cap._SPD = 1;
Jiang Liu952c63e2013-06-29 00:24:38 +0800925 if (acpi_has_method(video->device->handle, "_VPO"))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926 video->cap._VPO = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927}
928
929/*
930 * Check whether the video bus device has required AML method to
931 * support the desired features
932 */
933
Len Brown4be44fc2005-08-05 00:44:28 -0400934static int acpi_video_bus_check(struct acpi_video_bus *video)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935{
Len Brown4be44fc2005-08-05 00:44:28 -0400936 acpi_status status = -ENOENT;
Alexander Chiang1e4cffe2009-06-10 19:56:00 +0000937 struct pci_dev *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938
939 if (!video)
Patrick Mocheld550d982006-06-27 00:41:40 -0400940 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941
Alexander Chiang1e4cffe2009-06-10 19:56:00 +0000942 dev = acpi_get_pci_dev(video->device->handle);
Thomas Renninger22c13f92008-08-01 17:37:54 +0200943 if (!dev)
944 return -ENODEV;
Alexander Chiang1e4cffe2009-06-10 19:56:00 +0000945 pci_dev_put(dev);
Thomas Renninger22c13f92008-08-01 17:37:54 +0200946
Felipe Contreras21fcb342013-08-01 18:43:59 -0500947 /*
948 * Since there is no HID, CID and so on for VGA driver, we have
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949 * to check well known required nodes.
950 */
951
Julius Volz98fb8fe2007-02-20 16:38:40 +0100952 /* Does this device support video switching? */
Stefan Bader3a1151e2009-08-21 11:03:05 +0200953 if (video->cap._DOS || video->cap._DOD) {
954 if (!video->cap._DOS) {
955 printk(KERN_WARNING FW_BUG
956 "ACPI(%s) defines _DOD but not _DOS\n",
957 acpi_device_bid(video->device));
958 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959 video->flags.multihead = 1;
960 status = 0;
961 }
962
Julius Volz98fb8fe2007-02-20 16:38:40 +0100963 /* Does this device support retrieving a video ROM? */
Len Brown4be44fc2005-08-05 00:44:28 -0400964 if (video->cap._ROM) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965 video->flags.rom = 1;
966 status = 0;
967 }
968
Julius Volz98fb8fe2007-02-20 16:38:40 +0100969 /* Does this device support configuring which video device to POST? */
Len Brown4be44fc2005-08-05 00:44:28 -0400970 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971 video->flags.post = 1;
972 status = 0;
973 }
974
Patrick Mocheld550d982006-06-27 00:41:40 -0400975 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976}
977
Felipe Contreras21fcb342013-08-01 18:43:59 -0500978/*
979 * --------------------------------------------------------------------------
980 * Driver Interface
981 * --------------------------------------------------------------------------
982 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983
984/* device interface */
Felipe Contreras915ea7e2013-08-03 22:12:50 +0200985static struct acpi_video_device_attrib *
Rui Zhang82cae992007-01-03 23:40:53 -0500986acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
987{
Dmitry Torokhov78eed022007-11-05 11:43:33 -0500988 struct acpi_video_enumerated_device *ids;
989 int i;
Rui Zhang82cae992007-01-03 23:40:53 -0500990
Dmitry Torokhov78eed022007-11-05 11:43:33 -0500991 for (i = 0; i < video->attached_count; i++) {
992 ids = &video->attached_array[i];
993 if ((ids->value.int_val & 0xffff) == device_id)
994 return &ids->value.attrib;
995 }
996
Rui Zhang82cae992007-01-03 23:40:53 -0500997 return NULL;
998}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999
1000static int
Matthew Garrette92a7162010-01-12 14:17:03 -05001001acpi_video_get_device_type(struct acpi_video_bus *video,
1002 unsigned long device_id)
1003{
1004 struct acpi_video_enumerated_device *ids;
1005 int i;
1006
1007 for (i = 0; i < video->attached_count; i++) {
1008 ids = &video->attached_array[i];
1009 if ((ids->value.int_val & 0xffff) == device_id)
1010 return ids->value.int_val;
1011 }
1012
1013 return 0;
1014}
1015
1016static int
Len Brown4be44fc2005-08-05 00:44:28 -04001017acpi_video_bus_get_one_device(struct acpi_device *device,
1018 struct acpi_video_bus *video)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019{
Matthew Wilcox27663c52008-10-10 02:22:59 -04001020 unsigned long long device_id;
Matthew Garrette92a7162010-01-12 14:17:03 -05001021 int status, device_type;
Len Brown4be44fc2005-08-05 00:44:28 -04001022 struct acpi_video_device *data;
Felipe Contreras915ea7e2013-08-03 22:12:50 +02001023 struct acpi_video_device_attrib *attribute;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024
Len Brown4be44fc2005-08-05 00:44:28 -04001025 status =
1026 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
Aaron Lu91e13aa2013-04-25 02:47:49 +00001027 /* Some device omits _ADR, we skip them instead of fail */
1028 if (ACPI_FAILURE(status))
1029 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030
Aaron Lu91e13aa2013-04-25 02:47:49 +00001031 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1032 if (!data)
1033 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034
Aaron Lu91e13aa2013-04-25 02:47:49 +00001035 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1036 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1037 device->driver_data = data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038
Aaron Lu91e13aa2013-04-25 02:47:49 +00001039 data->device_id = device_id;
1040 data->video = video;
1041 data->dev = device;
Linus Torvalds8ab58e82014-07-18 14:32:51 +02001042 INIT_DELAYED_WORK(&data->switch_brightness_work,
1043 acpi_video_switch_brightness);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044
Aaron Lu91e13aa2013-04-25 02:47:49 +00001045 attribute = acpi_video_get_device_attr(video, device_id);
Rui Zhang82cae992007-01-03 23:40:53 -05001046
Felipe Contreras915ea7e2013-08-03 22:12:50 +02001047 if (attribute && attribute->device_id_scheme) {
Aaron Lu91e13aa2013-04-25 02:47:49 +00001048 switch (attribute->display_type) {
1049 case ACPI_VIDEO_DISPLAY_CRT:
1050 data->flags.crt = 1;
1051 break;
1052 case ACPI_VIDEO_DISPLAY_TV:
1053 data->flags.tvout = 1;
1054 break;
1055 case ACPI_VIDEO_DISPLAY_DVI:
1056 data->flags.dvi = 1;
1057 break;
1058 case ACPI_VIDEO_DISPLAY_LCD:
1059 data->flags.lcd = 1;
1060 break;
1061 default:
1062 data->flags.unknown = 1;
1063 break;
1064 }
Felipe Contreras915ea7e2013-08-03 22:12:50 +02001065 if (attribute->bios_can_detect)
Aaron Lu91e13aa2013-04-25 02:47:49 +00001066 data->flags.bios = 1;
1067 } else {
1068 /* Check for legacy IDs */
1069 device_type = acpi_video_get_device_type(video, device_id);
1070 /* Ignore bits 16 and 18-20 */
1071 switch (device_type & 0xffe2ffff) {
Felipe Contreras915ea7e2013-08-03 22:12:50 +02001072 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1073 data->flags.crt = 1;
1074 break;
1075 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1076 data->flags.lcd = 1;
1077 break;
1078 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1079 data->flags.tvout = 1;
1080 break;
1081 default:
1082 data->flags.unknown = 1;
Matthew Garrette92a7162010-01-12 14:17:03 -05001083 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001084 }
1085
Aaron Lu91e13aa2013-04-25 02:47:49 +00001086 acpi_video_device_bind(video, data);
1087 acpi_video_device_find_cap(data);
1088
Aaron Lu91e13aa2013-04-25 02:47:49 +00001089 mutex_lock(&video->device_list_lock);
1090 list_add_tail(&data->entry, &video->video_device_list);
1091 mutex_unlock(&video->device_list_lock);
1092
1093 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001094}
1095
1096/*
1097 * Arg:
Felipe Contreras21fcb342013-08-01 18:43:59 -05001098 * video : video bus device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001099 *
1100 * Return:
Felipe Contreras21fcb342013-08-01 18:43:59 -05001101 * none
1102 *
1103 * Enumerate the video device list of the video bus,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001104 * bind the ids with the corresponding video devices
1105 * under the video bus.
Len Brown4be44fc2005-08-05 00:44:28 -04001106 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001107
Len Brown4be44fc2005-08-05 00:44:28 -04001108static void acpi_video_device_rebind(struct acpi_video_bus *video)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109{
Dmitry Torokhovff102ea2007-11-05 11:43:31 -05001110 struct acpi_video_device *dev;
1111
Dmitry Torokhovbbac81f2007-11-05 11:43:32 -05001112 mutex_lock(&video->device_list_lock);
Dmitry Torokhovff102ea2007-11-05 11:43:31 -05001113
1114 list_for_each_entry(dev, &video->video_device_list, entry)
Len Brown4be44fc2005-08-05 00:44:28 -04001115 acpi_video_device_bind(video, dev);
Dmitry Torokhovff102ea2007-11-05 11:43:31 -05001116
Dmitry Torokhovbbac81f2007-11-05 11:43:32 -05001117 mutex_unlock(&video->device_list_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001118}
1119
1120/*
1121 * Arg:
Felipe Contreras21fcb342013-08-01 18:43:59 -05001122 * video : video bus device
1123 * device : video output device under the video
1124 * bus
Linus Torvalds1da177e2005-04-16 15:20:36 -07001125 *
1126 * Return:
Felipe Contreras21fcb342013-08-01 18:43:59 -05001127 * none
1128 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129 * Bind the ids with the corresponding video devices
1130 * under the video bus.
Len Brown4be44fc2005-08-05 00:44:28 -04001131 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001132
1133static void
Len Brown4be44fc2005-08-05 00:44:28 -04001134acpi_video_device_bind(struct acpi_video_bus *video,
1135 struct acpi_video_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001136{
Dmitry Torokhov78eed022007-11-05 11:43:33 -05001137 struct acpi_video_enumerated_device *ids;
Len Brown4be44fc2005-08-05 00:44:28 -04001138 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001139
Dmitry Torokhov78eed022007-11-05 11:43:33 -05001140 for (i = 0; i < video->attached_count; i++) {
1141 ids = &video->attached_array[i];
1142 if (device->device_id == (ids->value.int_val & 0xffff)) {
1143 ids->bind_info = device;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001144 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1145 }
1146 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001147}
1148
Aaron Lu0b8db272014-09-30 14:10:17 +08001149static bool acpi_video_device_in_dod(struct acpi_video_device *device)
1150{
1151 struct acpi_video_bus *video = device->video;
1152 int i;
1153
1154 /* If we have a broken _DOD, no need to test */
1155 if (!video->attached_count)
1156 return true;
1157
1158 for (i = 0; i < video->attached_count; i++) {
1159 if (video->attached_array[i].bind_info == device)
1160 return true;
1161 }
1162
1163 return false;
1164}
1165
Linus Torvalds1da177e2005-04-16 15:20:36 -07001166/*
1167 * Arg:
Felipe Contreras21fcb342013-08-01 18:43:59 -05001168 * video : video bus device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001169 *
1170 * Return:
Felipe Contreras21fcb342013-08-01 18:43:59 -05001171 * < 0 : error
1172 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001173 * Call _DOD to enumerate all devices attached to display adapter
1174 *
Len Brown4be44fc2005-08-05 00:44:28 -04001175 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001176
1177static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1178{
Len Brown4be44fc2005-08-05 00:44:28 -04001179 int status;
1180 int count;
1181 int i;
Dmitry Torokhov78eed022007-11-05 11:43:33 -05001182 struct acpi_video_enumerated_device *active_list;
Len Brown4be44fc2005-08-05 00:44:28 -04001183 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1184 union acpi_object *dod = NULL;
1185 union acpi_object *obj;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186
Patrick Mochel90130262006-05-19 16:54:48 -04001187 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188 if (!ACPI_SUCCESS(status)) {
Thomas Renningera6fc6722006-06-26 23:58:43 -04001189 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
Patrick Mocheld550d982006-06-27 00:41:40 -04001190 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001191 }
1192
Jan Engelhardt50dd0962006-10-01 00:28:50 +02001193 dod = buffer.pointer;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001194 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
Thomas Renningera6fc6722006-06-26 23:58:43 -04001195 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001196 status = -EFAULT;
1197 goto out;
1198 }
1199
1200 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
Len Brown4be44fc2005-08-05 00:44:28 -04001201 dod->package.count));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001202
Dmitry Torokhov78eed022007-11-05 11:43:33 -05001203 active_list = kcalloc(1 + dod->package.count,
1204 sizeof(struct acpi_video_enumerated_device),
1205 GFP_KERNEL);
1206 if (!active_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207 status = -ENOMEM;
1208 goto out;
1209 }
1210
1211 count = 0;
1212 for (i = 0; i < dod->package.count; i++) {
Jan Engelhardt50dd0962006-10-01 00:28:50 +02001213 obj = &dod->package.elements[i];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001214
1215 if (obj->type != ACPI_TYPE_INTEGER) {
Dmitry Torokhov78eed022007-11-05 11:43:33 -05001216 printk(KERN_ERR PREFIX
1217 "Invalid _DOD data in element %d\n", i);
1218 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001219 }
Dmitry Torokhov78eed022007-11-05 11:43:33 -05001220
1221 active_list[count].value.int_val = obj->integer.value;
1222 active_list[count].bind_info = NULL;
Len Brown4be44fc2005-08-05 00:44:28 -04001223 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1224 (int)obj->integer.value));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001225 count++;
1226 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001227
Jesper Juhl6044ec82005-11-07 01:01:32 -08001228 kfree(video->attached_array);
Len Brown4be44fc2005-08-05 00:44:28 -04001229
Dmitry Torokhov78eed022007-11-05 11:43:33 -05001230 video->attached_array = active_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001231 video->attached_count = count;
Dmitry Torokhov78eed022007-11-05 11:43:33 -05001232
Felipe Contreras915ea7e2013-08-03 22:12:50 +02001233out:
Len Brown02438d82006-06-30 03:19:10 -04001234 kfree(buffer.pointer);
Patrick Mocheld550d982006-06-27 00:41:40 -04001235 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001236}
1237
Len Brown4be44fc2005-08-05 00:44:28 -04001238static int
1239acpi_video_get_next_level(struct acpi_video_device *device,
1240 u32 level_current, u32 event)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001241{
Alexey Starikovskiy63f0edf2007-09-03 16:30:08 +04001242 int min, max, min_above, max_below, i, l, delta = 255;
Thomas Tuttlef4715182006-12-19 12:56:14 -08001243 max = max_below = 0;
1244 min = min_above = 255;
Alexey Starikovskiy63f0edf2007-09-03 16:30:08 +04001245 /* Find closest level to level_current */
Zhao Yakui0a3db1c2009-02-02 11:33:41 +08001246 for (i = 2; i < device->brightness->count; i++) {
Alexey Starikovskiy63f0edf2007-09-03 16:30:08 +04001247 l = device->brightness->levels[i];
1248 if (abs(l - level_current) < abs(delta)) {
1249 delta = l - level_current;
1250 if (!delta)
1251 break;
1252 }
1253 }
1254 /* Ajust level_current to closest available level */
1255 level_current += delta;
Zhao Yakui0a3db1c2009-02-02 11:33:41 +08001256 for (i = 2; i < device->brightness->count; i++) {
Thomas Tuttlef4715182006-12-19 12:56:14 -08001257 l = device->brightness->levels[i];
1258 if (l < min)
1259 min = l;
1260 if (l > max)
1261 max = l;
1262 if (l < min_above && l > level_current)
1263 min_above = l;
1264 if (l > max_below && l < level_current)
1265 max_below = l;
1266 }
1267
1268 switch (event) {
1269 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1270 return (level_current < max) ? min_above : min;
1271 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1272 return (level_current < max) ? min_above : max;
1273 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1274 return (level_current > min) ? max_below : min;
1275 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1276 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1277 return 0;
1278 default:
1279 return level_current;
1280 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001281}
1282
Linus Torvalds8ab58e82014-07-18 14:32:51 +02001283static void
1284acpi_video_switch_brightness(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001285{
Linus Torvalds8ab58e82014-07-18 14:32:51 +02001286 struct acpi_video_device *device = container_of(to_delayed_work(work),
1287 struct acpi_video_device, switch_brightness_work);
Matthew Wilcox27663c52008-10-10 02:22:59 -04001288 unsigned long long level_current, level_next;
Linus Torvalds8ab58e82014-07-18 14:32:51 +02001289 int event = device->switch_brightness_event;
Zhang Ruic8890f92009-03-18 16:27:08 +08001290 int result = -EINVAL;
1291
Aaron Lufbc9fe12013-10-11 21:27:45 +08001292 /* no warning message if acpi_backlight=vendor or a quirk is used */
1293 if (!acpi_video_verify_backlight_support())
Linus Torvalds8ab58e82014-07-18 14:32:51 +02001294 return;
Zhang Rui28c32e92009-07-13 10:33:24 +08001295
Julia Jomantaite469778c2008-06-23 22:50:42 +01001296 if (!device->brightness)
Zhang Ruic8890f92009-03-18 16:27:08 +08001297 goto out;
1298
1299 result = acpi_video_device_lcd_get_level_current(device,
Danny Baumanna89803d2013-03-19 16:22:50 +00001300 &level_current,
1301 false);
Zhang Ruic8890f92009-03-18 16:27:08 +08001302 if (result)
1303 goto out;
1304
Linus Torvalds1da177e2005-04-16 15:20:36 -07001305 level_next = acpi_video_get_next_level(device, level_current, event);
Zhang Ruic8890f92009-03-18 16:27:08 +08001306
Zhang Rui24450c72009-03-18 16:27:10 +08001307 result = acpi_video_device_lcd_set_level(device, level_next);
Zhang Ruic8890f92009-03-18 16:27:08 +08001308
Matthew Garrett36342742009-07-14 17:06:03 +01001309 if (!result)
1310 backlight_force_update(device->backlight,
1311 BACKLIGHT_UPDATE_HOTKEY);
1312
Zhang Ruic8890f92009-03-18 16:27:08 +08001313out:
1314 if (result)
1315 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001316}
1317
Matthew Garrette92a7162010-01-12 14:17:03 -05001318int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1319 void **edid)
1320{
1321 struct acpi_video_bus *video;
1322 struct acpi_video_device *video_device;
1323 union acpi_object *buffer = NULL;
1324 acpi_status status;
1325 int i, length;
1326
1327 if (!device || !acpi_driver_data(device))
1328 return -EINVAL;
1329
1330 video = acpi_driver_data(device);
1331
1332 for (i = 0; i < video->attached_count; i++) {
1333 video_device = video->attached_array[i].bind_info;
1334 length = 256;
1335
1336 if (!video_device)
1337 continue;
1338
Zhang Rui82069552010-12-06 15:04:24 +08001339 if (!video_device->cap._DDC)
1340 continue;
1341
Matthew Garrette92a7162010-01-12 14:17:03 -05001342 if (type) {
1343 switch (type) {
1344 case ACPI_VIDEO_DISPLAY_CRT:
1345 if (!video_device->flags.crt)
1346 continue;
1347 break;
1348 case ACPI_VIDEO_DISPLAY_TV:
1349 if (!video_device->flags.tvout)
1350 continue;
1351 break;
1352 case ACPI_VIDEO_DISPLAY_DVI:
1353 if (!video_device->flags.dvi)
1354 continue;
1355 break;
1356 case ACPI_VIDEO_DISPLAY_LCD:
1357 if (!video_device->flags.lcd)
1358 continue;
1359 break;
1360 }
1361 } else if (video_device->device_id != device_id) {
1362 continue;
1363 }
1364
1365 status = acpi_video_device_EDID(video_device, &buffer, length);
1366
1367 if (ACPI_FAILURE(status) || !buffer ||
1368 buffer->type != ACPI_TYPE_BUFFER) {
1369 length = 128;
1370 status = acpi_video_device_EDID(video_device, &buffer,
1371 length);
1372 if (ACPI_FAILURE(status) || !buffer ||
1373 buffer->type != ACPI_TYPE_BUFFER) {
1374 continue;
1375 }
1376 }
1377
1378 *edid = buffer->buffer.pointer;
1379 return length;
1380 }
1381
1382 return -ENODEV;
1383}
1384EXPORT_SYMBOL(acpi_video_get_edid);
1385
Linus Torvalds1da177e2005-04-16 15:20:36 -07001386static int
Len Brown4be44fc2005-08-05 00:44:28 -04001387acpi_video_bus_get_devices(struct acpi_video_bus *video,
1388 struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001389{
Igor Murzovfba4e082012-10-13 04:41:25 +04001390 int status = 0;
Dmitry Torokhovff102ea2007-11-05 11:43:31 -05001391 struct acpi_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001392
Igor Murzovfba4e082012-10-13 04:41:25 +04001393 /*
1394 * There are systems where video module known to work fine regardless
1395 * of broken _DOD and ignoring returned value here doesn't cause
1396 * any issues later.
1397 */
1398 acpi_video_device_enumerate(video);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399
Dmitry Torokhovff102ea2007-11-05 11:43:31 -05001400 list_for_each_entry(dev, &device->children, node) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001401
1402 status = acpi_video_bus_get_one_device(dev, video);
Igor Murzovea9f8852012-03-30 21:32:08 +04001403 if (status) {
Aaron Lu91e13aa2013-04-25 02:47:49 +00001404 dev_err(&dev->dev, "Can't attach device\n");
1405 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001406 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407 }
Patrick Mocheld550d982006-06-27 00:41:40 -04001408 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001409}
1410
Linus Torvalds1da177e2005-04-16 15:20:36 -07001411/* acpi_video interface */
1412
Aaron Luefaa14c2013-07-16 13:08:05 +08001413/*
1414 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1415 * preform any automatic brightness change on receiving a notification.
1416 */
Len Brown4be44fc2005-08-05 00:44:28 -04001417static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001418{
Aaron Luefaa14c2013-07-16 13:08:05 +08001419 return acpi_video_bus_DOS(video, 0,
Aaron Lufbc9fe12013-10-11 21:27:45 +08001420 acpi_osi_is_win8() ? 1 : 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001421}
1422
Len Brown4be44fc2005-08-05 00:44:28 -04001423static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001424{
Aaron Luefaa14c2013-07-16 13:08:05 +08001425 return acpi_video_bus_DOS(video, 0,
Aaron Lufbc9fe12013-10-11 21:27:45 +08001426 acpi_osi_is_win8() ? 0 : 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001427}
1428
Bjorn Helgaas70155582009-04-07 15:37:11 +00001429static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001430{
Bjorn Helgaas70155582009-04-07 15:37:11 +00001431 struct acpi_video_bus *video = acpi_driver_data(device);
Luming Yue9dab192007-08-20 18:23:53 +08001432 struct input_dev *input;
Matthew Garrett17c452f2009-12-11 17:40:46 -05001433 int keycode = 0;
Luming Yue9dab192007-08-20 18:23:53 +08001434
Aaron Lu67b662e2013-10-11 21:27:44 +08001435 if (!video || !video->input)
Patrick Mocheld550d982006-06-27 00:41:40 -04001436 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001437
Luming Yue9dab192007-08-20 18:23:53 +08001438 input = video->input;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001439
1440 switch (event) {
Julius Volz98fb8fe2007-02-20 16:38:40 +01001441 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001442 * most likely via hotkey. */
Luca Tettamanti8a37c652012-08-02 15:30:27 +02001443 keycode = KEY_SWITCHVIDEOMODE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001444 break;
1445
Julius Volz98fb8fe2007-02-20 16:38:40 +01001446 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
Linus Torvalds1da177e2005-04-16 15:20:36 -07001447 * connector. */
1448 acpi_video_device_enumerate(video);
1449 acpi_video_device_rebind(video);
Luming Yue9dab192007-08-20 18:23:53 +08001450 keycode = KEY_SWITCHVIDEOMODE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001451 break;
1452
Len Brown4be44fc2005-08-05 00:44:28 -04001453 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
Luming Yue9dab192007-08-20 18:23:53 +08001454 keycode = KEY_SWITCHVIDEOMODE;
1455 break;
Len Brown4be44fc2005-08-05 00:44:28 -04001456 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
Luming Yue9dab192007-08-20 18:23:53 +08001457 keycode = KEY_VIDEO_NEXT;
1458 break;
Len Brown4be44fc2005-08-05 00:44:28 -04001459 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
Luming Yue9dab192007-08-20 18:23:53 +08001460 keycode = KEY_VIDEO_PREV;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001461 break;
1462
1463 default:
1464 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -04001465 "Unsupported event [0x%x]\n", event));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001466 break;
1467 }
1468
Luca Tettamanti8a37c652012-08-02 15:30:27 +02001469 if (acpi_notifier_call_chain(device, event, 0))
1470 /* Something vetoed the keypress. */
1471 keycode = 0;
Matthew Garrett17c452f2009-12-11 17:40:46 -05001472
1473 if (keycode) {
1474 input_report_key(input, keycode, 1);
1475 input_sync(input);
1476 input_report_key(input, keycode, 0);
1477 input_sync(input);
1478 }
Luming Yue9dab192007-08-20 18:23:53 +08001479
Patrick Mocheld550d982006-06-27 00:41:40 -04001480 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001481}
1482
Linus Torvalds8ab58e82014-07-18 14:32:51 +02001483static void brightness_switch_event(struct acpi_video_device *video_device,
1484 u32 event)
1485{
1486 if (!brightness_switch_enabled)
1487 return;
1488
1489 video_device->switch_brightness_event = event;
1490 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10);
1491}
1492
Len Brown4be44fc2005-08-05 00:44:28 -04001493static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001494{
Jan Engelhardt50dd0962006-10-01 00:28:50 +02001495 struct acpi_video_device *video_device = data;
Len Brown4be44fc2005-08-05 00:44:28 -04001496 struct acpi_device *device = NULL;
Luming Yue9dab192007-08-20 18:23:53 +08001497 struct acpi_video_bus *bus;
1498 struct input_dev *input;
Matthew Garrett17c452f2009-12-11 17:40:46 -05001499 int keycode = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001500
Linus Torvalds1da177e2005-04-16 15:20:36 -07001501 if (!video_device)
Patrick Mocheld550d982006-06-27 00:41:40 -04001502 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001503
Patrick Mochele6afa0d2006-05-19 16:54:40 -04001504 device = video_device->dev;
Luming Yue9dab192007-08-20 18:23:53 +08001505 bus = video_device->video;
1506 input = bus->input;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001507
1508 switch (event) {
Len Brown4be44fc2005-08-05 00:44:28 -04001509 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
Linus Torvalds8ab58e82014-07-18 14:32:51 +02001510 brightness_switch_event(video_device, event);
Luming Yue9dab192007-08-20 18:23:53 +08001511 keycode = KEY_BRIGHTNESS_CYCLE;
1512 break;
Len Brown4be44fc2005-08-05 00:44:28 -04001513 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
Linus Torvalds8ab58e82014-07-18 14:32:51 +02001514 brightness_switch_event(video_device, event);
Luming Yue9dab192007-08-20 18:23:53 +08001515 keycode = KEY_BRIGHTNESSUP;
1516 break;
Len Brown4be44fc2005-08-05 00:44:28 -04001517 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
Linus Torvalds8ab58e82014-07-18 14:32:51 +02001518 brightness_switch_event(video_device, event);
Luming Yue9dab192007-08-20 18:23:53 +08001519 keycode = KEY_BRIGHTNESSDOWN;
1520 break;
Justin P. Mattock70f23fd2011-05-10 10:16:21 +02001521 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
Linus Torvalds8ab58e82014-07-18 14:32:51 +02001522 brightness_switch_event(video_device, event);
Luming Yue9dab192007-08-20 18:23:53 +08001523 keycode = KEY_BRIGHTNESS_ZERO;
1524 break;
Len Brown4be44fc2005-08-05 00:44:28 -04001525 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
Linus Torvalds8ab58e82014-07-18 14:32:51 +02001526 brightness_switch_event(video_device, event);
Luming Yue9dab192007-08-20 18:23:53 +08001527 keycode = KEY_DISPLAY_OFF;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001528 break;
1529 default:
1530 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -04001531 "Unsupported event [0x%x]\n", event));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001532 break;
1533 }
Luming Yue9dab192007-08-20 18:23:53 +08001534
Zhang Rui7761f632008-01-25 14:48:12 +08001535 acpi_notifier_call_chain(device, event, 0);
Matthew Garrett17c452f2009-12-11 17:40:46 -05001536
1537 if (keycode) {
1538 input_report_key(input, keycode, 1);
1539 input_sync(input);
1540 input_report_key(input, keycode, 0);
1541 input_sync(input);
1542 }
Luming Yue9dab192007-08-20 18:23:53 +08001543
Patrick Mocheld550d982006-06-27 00:41:40 -04001544 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001545}
1546
Rafael J. Wysockiac7729d2010-04-05 01:43:51 +02001547static int acpi_video_resume(struct notifier_block *nb,
1548 unsigned long val, void *ign)
Matthew Garrett863c1492008-02-04 23:31:24 -08001549{
1550 struct acpi_video_bus *video;
1551 struct acpi_video_device *video_device;
1552 int i;
1553
Rafael J. Wysockiac7729d2010-04-05 01:43:51 +02001554 switch (val) {
1555 case PM_HIBERNATION_PREPARE:
1556 case PM_SUSPEND_PREPARE:
1557 case PM_RESTORE_PREPARE:
1558 return NOTIFY_DONE;
1559 }
Matthew Garrett863c1492008-02-04 23:31:24 -08001560
Rafael J. Wysockiac7729d2010-04-05 01:43:51 +02001561 video = container_of(nb, struct acpi_video_bus, pm_nb);
1562
1563 dev_info(&video->device->dev, "Restoring backlight state\n");
Matthew Garrett863c1492008-02-04 23:31:24 -08001564
1565 for (i = 0; i < video->attached_count; i++) {
1566 video_device = video->attached_array[i].bind_info;
1567 if (video_device && video_device->backlight)
1568 acpi_video_set_brightness(video_device->backlight);
1569 }
Rafael J. Wysockiac7729d2010-04-05 01:43:51 +02001570
1571 return NOTIFY_OK;
Matthew Garrett863c1492008-02-04 23:31:24 -08001572}
1573
Zhang Ruic504f8c2009-12-30 15:59:23 +08001574static acpi_status
1575acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1576 void **return_value)
1577{
1578 struct acpi_device *device = context;
1579 struct acpi_device *sibling;
1580 int result;
1581
1582 if (handle == device->handle)
1583 return AE_CTRL_TERMINATE;
1584
1585 result = acpi_bus_get_device(handle, &sibling);
1586 if (result)
1587 return AE_OK;
1588
1589 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1590 return AE_ALREADY_EXISTS;
1591
1592 return AE_OK;
1593}
1594
Aaron Lu67b662e2013-10-11 21:27:44 +08001595static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1596{
Hans de Goede99678ed2014-05-15 13:22:33 +02001597 struct backlight_properties props;
1598 struct pci_dev *pdev;
1599 acpi_handle acpi_parent;
1600 struct device *parent = NULL;
1601 int result;
1602 static int count;
1603 char *name;
Aaron Lu67b662e2013-10-11 21:27:44 +08001604
Aaron Lu0b8db272014-09-30 14:10:17 +08001605 /*
1606 * Do not create backlight device for video output
1607 * device that is not in the enumerated list.
1608 */
1609 if (!acpi_video_device_in_dod(device)) {
1610 dev_dbg(&device->dev->dev, "not in _DOD list, ignore\n");
1611 return;
1612 }
1613
Hans de Goede99678ed2014-05-15 13:22:33 +02001614 result = acpi_video_init_brightness(device);
1615 if (result)
1616 return;
1617 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1618 if (!name)
1619 return;
1620 count++;
Aaron Lu67b662e2013-10-11 21:27:44 +08001621
Hans de Goede99678ed2014-05-15 13:22:33 +02001622 acpi_get_parent(device->dev->handle, &acpi_parent);
Aaron Lu67b662e2013-10-11 21:27:44 +08001623
Hans de Goede99678ed2014-05-15 13:22:33 +02001624 pdev = acpi_get_pci_dev(acpi_parent);
1625 if (pdev) {
1626 parent = &pdev->dev;
1627 pci_dev_put(pdev);
Aaron Lu67b662e2013-10-11 21:27:44 +08001628 }
Hans de Goede99678ed2014-05-15 13:22:33 +02001629
1630 memset(&props, 0, sizeof(struct backlight_properties));
1631 props.type = BACKLIGHT_FIRMWARE;
1632 props.max_brightness = device->brightness->count - 3;
1633 device->backlight = backlight_device_register(name,
1634 parent,
1635 device,
1636 &acpi_backlight_ops,
1637 &props);
1638 kfree(name);
1639 if (IS_ERR(device->backlight))
1640 return;
1641
1642 /*
1643 * Save current brightness level in case we have to restore it
1644 * before acpi_video_device_lcd_set_level() is called next time.
1645 */
1646 device->backlight->props.brightness =
1647 acpi_video_get_brightness(device->backlight);
1648
1649 device->cooling_dev = thermal_cooling_device_register("LCD",
1650 device->dev, &video_cooling_ops);
1651 if (IS_ERR(device->cooling_dev)) {
1652 /*
1653 * Set cooling_dev to NULL so we don't crash trying to free it.
1654 * Also, why the hell we are returning early and not attempt to
1655 * register video output if cooling device registration failed?
1656 * -- dtor
1657 */
1658 device->cooling_dev = NULL;
1659 return;
1660 }
1661
1662 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1663 device->cooling_dev->id);
1664 result = sysfs_create_link(&device->dev->dev.kobj,
1665 &device->cooling_dev->device.kobj,
1666 "thermal_cooling");
1667 if (result)
1668 printk(KERN_ERR PREFIX "Create sysfs link\n");
1669 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1670 &device->dev->dev.kobj, "device");
1671 if (result)
1672 printk(KERN_ERR PREFIX "Create sysfs link\n");
Aaron Lu67b662e2013-10-11 21:27:44 +08001673}
1674
1675static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1676{
1677 struct acpi_video_device *dev;
1678
Hans de Goede53a92ba2014-05-21 15:39:55 +02001679 if (video->backlight_registered)
1680 return 0;
1681
Hans de Goede99678ed2014-05-15 13:22:33 +02001682 if (!acpi_video_verify_backlight_support())
1683 return 0;
1684
Aaron Lu67b662e2013-10-11 21:27:44 +08001685 mutex_lock(&video->device_list_lock);
1686 list_for_each_entry(dev, &video->video_device_list, entry)
1687 acpi_video_dev_register_backlight(dev);
1688 mutex_unlock(&video->device_list_lock);
1689
Hans de Goede99678ed2014-05-15 13:22:33 +02001690 video->backlight_registered = true;
1691
Aaron Lu67b662e2013-10-11 21:27:44 +08001692 video->pm_nb.notifier_call = acpi_video_resume;
1693 video->pm_nb.priority = 0;
1694 return register_pm_notifier(&video->pm_nb);
1695}
1696
1697static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1698{
1699 if (device->backlight) {
1700 backlight_device_unregister(device->backlight);
1701 device->backlight = NULL;
1702 }
1703 if (device->brightness) {
1704 kfree(device->brightness->levels);
1705 kfree(device->brightness);
1706 device->brightness = NULL;
1707 }
1708 if (device->cooling_dev) {
1709 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1710 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1711 thermal_cooling_device_unregister(device->cooling_dev);
1712 device->cooling_dev = NULL;
1713 }
1714}
1715
1716static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1717{
1718 struct acpi_video_device *dev;
Hans de Goede99678ed2014-05-15 13:22:33 +02001719 int error;
1720
1721 if (!video->backlight_registered)
1722 return 0;
1723
1724 error = unregister_pm_notifier(&video->pm_nb);
Aaron Lu67b662e2013-10-11 21:27:44 +08001725
1726 mutex_lock(&video->device_list_lock);
1727 list_for_each_entry(dev, &video->video_device_list, entry)
1728 acpi_video_dev_unregister_backlight(dev);
1729 mutex_unlock(&video->device_list_lock);
1730
Hans de Goede99678ed2014-05-15 13:22:33 +02001731 video->backlight_registered = false;
1732
Aaron Lu67b662e2013-10-11 21:27:44 +08001733 return error;
1734}
1735
1736static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1737{
1738 acpi_status status;
1739 struct acpi_device *adev = device->dev;
1740
1741 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1742 acpi_video_device_notify, device);
1743 if (ACPI_FAILURE(status))
1744 dev_err(&adev->dev, "Error installing notify handler\n");
1745 else
1746 device->flags.notify = 1;
1747}
1748
1749static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1750{
1751 struct input_dev *input;
1752 struct acpi_video_device *dev;
1753 int error;
1754
1755 video->input = input = input_allocate_device();
1756 if (!input) {
1757 error = -ENOMEM;
1758 goto out;
1759 }
1760
1761 error = acpi_video_bus_start_devices(video);
1762 if (error)
1763 goto err_free_input;
1764
1765 snprintf(video->phys, sizeof(video->phys),
1766 "%s/video/input0", acpi_device_hid(video->device));
1767
1768 input->name = acpi_device_name(video->device);
1769 input->phys = video->phys;
1770 input->id.bustype = BUS_HOST;
1771 input->id.product = 0x06;
1772 input->dev.parent = &video->device->dev;
1773 input->evbit[0] = BIT(EV_KEY);
1774 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1775 set_bit(KEY_VIDEO_NEXT, input->keybit);
1776 set_bit(KEY_VIDEO_PREV, input->keybit);
1777 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1778 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1779 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1780 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1781 set_bit(KEY_DISPLAY_OFF, input->keybit);
1782
1783 error = input_register_device(input);
1784 if (error)
1785 goto err_stop_dev;
1786
1787 mutex_lock(&video->device_list_lock);
1788 list_for_each_entry(dev, &video->video_device_list, entry)
1789 acpi_video_dev_add_notify_handler(dev);
1790 mutex_unlock(&video->device_list_lock);
1791
1792 return 0;
1793
1794err_stop_dev:
1795 acpi_video_bus_stop_devices(video);
1796err_free_input:
1797 input_free_device(input);
1798 video->input = NULL;
1799out:
1800 return error;
1801}
1802
1803static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
1804{
1805 if (dev->flags.notify) {
1806 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
1807 acpi_video_device_notify);
1808 dev->flags.notify = 0;
1809 }
1810}
1811
1812static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
1813{
1814 struct acpi_video_device *dev;
1815
1816 mutex_lock(&video->device_list_lock);
1817 list_for_each_entry(dev, &video->video_device_list, entry)
1818 acpi_video_dev_remove_notify_handler(dev);
1819 mutex_unlock(&video->device_list_lock);
1820
1821 acpi_video_bus_stop_devices(video);
1822 input_unregister_device(video->input);
1823 video->input = NULL;
1824}
1825
Hans de Goede53a92ba2014-05-21 15:39:55 +02001826static int acpi_video_backlight_notify(struct notifier_block *nb,
1827 unsigned long val, void *bd)
1828{
1829 struct backlight_device *backlight = bd;
1830 struct acpi_video_bus *video;
1831
1832 /* acpi_video_verify_backlight_support only cares about raw devices */
1833 if (backlight->props.type != BACKLIGHT_RAW)
1834 return NOTIFY_DONE;
1835
1836 video = container_of(nb, struct acpi_video_bus, backlight_nb);
1837
1838 switch (val) {
1839 case BACKLIGHT_REGISTERED:
1840 if (!acpi_video_verify_backlight_support())
1841 acpi_video_bus_unregister_backlight(video);
1842 break;
1843 case BACKLIGHT_UNREGISTERED:
1844 acpi_video_bus_register_backlight(video);
1845 break;
1846 }
1847
1848 return NOTIFY_OK;
1849}
1850
1851static int acpi_video_bus_add_backlight_notify_handler(
1852 struct acpi_video_bus *video)
1853{
1854 int error;
1855
1856 video->backlight_nb.notifier_call = acpi_video_backlight_notify;
1857 video->backlight_nb.priority = 0;
1858 error = backlight_register_notifier(&video->backlight_nb);
1859 if (error == 0)
1860 video->backlight_notifier_registered = true;
1861
1862 return error;
1863}
1864
1865static int acpi_video_bus_remove_backlight_notify_handler(
1866 struct acpi_video_bus *video)
1867{
1868 if (!video->backlight_notifier_registered)
1869 return 0;
1870
1871 video->backlight_notifier_registered = false;
1872
1873 return backlight_unregister_notifier(&video->backlight_nb);
1874}
1875
Aaron Lu67b662e2013-10-11 21:27:44 +08001876static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1877{
1878 struct acpi_video_device *dev, *next;
1879
1880 mutex_lock(&video->device_list_lock);
1881 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1882 list_del(&dev->entry);
1883 kfree(dev);
1884 }
1885 mutex_unlock(&video->device_list_lock);
1886
1887 return 0;
1888}
1889
Rafael J. Wysockiac7729d2010-04-05 01:43:51 +02001890static int instance;
1891
Len Brown4be44fc2005-08-05 00:44:28 -04001892static int acpi_video_bus_add(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001893{
Dmitry Torokhovf51e8392007-11-05 11:43:30 -05001894 struct acpi_video_bus *video;
Dmitry Torokhovf51e8392007-11-05 11:43:30 -05001895 int error;
Zhang Ruic504f8c2009-12-30 15:59:23 +08001896 acpi_status status;
1897
1898 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1899 device->parent->handle, 1,
1900 acpi_video_bus_match, NULL,
1901 device, NULL);
1902 if (status == AE_ALREADY_EXISTS) {
1903 printk(KERN_WARNING FW_BUG
1904 "Duplicate ACPI video bus devices for the"
1905 " same VGA controller, please try module "
1906 "parameter \"video.allow_duplicates=1\""
1907 "if the current driver doesn't work.\n");
1908 if (!allow_duplicates)
1909 return -ENODEV;
1910 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001911
Burman Yan36bcbec2006-12-19 12:56:11 -08001912 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001913 if (!video)
Patrick Mocheld550d982006-06-27 00:41:40 -04001914 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001915
Zhang Ruie6d9da12007-08-25 02:23:31 -04001916 /* a hack to fix the duplicate name "VID" problem on T61 */
1917 if (!strcmp(device->pnp.bus_id, "VID")) {
1918 if (instance)
1919 device->pnp.bus_id[3] = '0' + instance;
Felipe Contreras915ea7e2013-08-03 22:12:50 +02001920 instance++;
Zhang Ruie6d9da12007-08-25 02:23:31 -04001921 }
Zhao Yakuif3b39f12009-02-02 22:55:01 -05001922 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1923 if (!strcmp(device->pnp.bus_id, "VGA")) {
1924 if (instance)
1925 device->pnp.bus_id[3] = '0' + instance;
1926 instance++;
1927 }
Zhang Ruie6d9da12007-08-25 02:23:31 -04001928
Patrick Mochele6afa0d2006-05-19 16:54:40 -04001929 video->device = device;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001930 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1931 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
Pavel Machekdb89b4f2008-09-22 14:37:34 -07001932 device->driver_data = video;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001933
1934 acpi_video_bus_find_cap(video);
Dmitry Torokhovf51e8392007-11-05 11:43:30 -05001935 error = acpi_video_bus_check(video);
1936 if (error)
1937 goto err_free_video;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001938
Dmitry Torokhovbbac81f2007-11-05 11:43:32 -05001939 mutex_init(&video->device_list_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001940 INIT_LIST_HEAD(&video->video_device_list);
1941
Igor Murzovea9f8852012-03-30 21:32:08 +04001942 error = acpi_video_bus_get_devices(video, device);
1943 if (error)
Aaron Lu91e13aa2013-04-25 02:47:49 +00001944 goto err_put_video;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001945
Linus Torvalds1da177e2005-04-16 15:20:36 -07001946 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
Len Brown4be44fc2005-08-05 00:44:28 -04001947 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1948 video->flags.multihead ? "yes" : "no",
1949 video->flags.rom ? "yes" : "no",
1950 video->flags.post ? "yes" : "no");
Aaron Lu67b662e2013-10-11 21:27:44 +08001951 mutex_lock(&video_list_lock);
1952 list_add_tail(&video->entry, &video_bus_head);
1953 mutex_unlock(&video_list_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001954
Aaron Lu67b662e2013-10-11 21:27:44 +08001955 acpi_video_bus_register_backlight(video);
1956 acpi_video_bus_add_notify_handler(video);
Hans de Goede53a92ba2014-05-21 15:39:55 +02001957 acpi_video_bus_add_backlight_notify_handler(video);
Rafael J. Wysockiac7729d2010-04-05 01:43:51 +02001958
Dmitry Torokhovf51e8392007-11-05 11:43:30 -05001959 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001960
Aaron Lu67b662e2013-10-11 21:27:44 +08001961err_put_video:
Dmitry Torokhovf51e8392007-11-05 11:43:30 -05001962 acpi_video_bus_put_devices(video);
1963 kfree(video->attached_array);
Aaron Lu67b662e2013-10-11 21:27:44 +08001964err_free_video:
Dmitry Torokhovf51e8392007-11-05 11:43:30 -05001965 kfree(video);
Pavel Machekdb89b4f2008-09-22 14:37:34 -07001966 device->driver_data = NULL;
Dmitry Torokhovf51e8392007-11-05 11:43:30 -05001967
1968 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001969}
1970
Rafael J. Wysocki51fac832013-01-24 00:24:48 +01001971static int acpi_video_bus_remove(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001972{
Len Brown4be44fc2005-08-05 00:44:28 -04001973 struct acpi_video_bus *video = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001974
Linus Torvalds1da177e2005-04-16 15:20:36 -07001975
1976 if (!device || !acpi_driver_data(device))
Patrick Mocheld550d982006-06-27 00:41:40 -04001977 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001978
Jan Engelhardt50dd0962006-10-01 00:28:50 +02001979 video = acpi_driver_data(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001980
Hans de Goede53a92ba2014-05-21 15:39:55 +02001981 acpi_video_bus_remove_backlight_notify_handler(video);
Aaron Lu67b662e2013-10-11 21:27:44 +08001982 acpi_video_bus_remove_notify_handler(video);
1983 acpi_video_bus_unregister_backlight(video);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001984 acpi_video_bus_put_devices(video);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001985
Aaron Lu67b662e2013-10-11 21:27:44 +08001986 mutex_lock(&video_list_lock);
1987 list_del(&video->entry);
1988 mutex_unlock(&video_list_lock);
1989
Jesper Juhl6044ec82005-11-07 01:01:32 -08001990 kfree(video->attached_array);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001991 kfree(video);
1992
Patrick Mocheld550d982006-06-27 00:41:40 -04001993 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001994}
1995
Alan Coxc6996bd2012-04-25 14:33:48 +01001996static int __init is_i740(struct pci_dev *dev)
1997{
1998 if (dev->device == 0x00D1)
1999 return 1;
2000 if (dev->device == 0x7000)
2001 return 1;
2002 return 0;
2003}
2004
Matthew Garrett74a365b2009-03-19 21:35:39 +00002005static int __init intel_opregion_present(void)
2006{
Alan Coxc6996bd2012-04-25 14:33:48 +01002007 int opregion = 0;
Matthew Garrett74a365b2009-03-19 21:35:39 +00002008 struct pci_dev *dev = NULL;
2009 u32 address;
2010
2011 for_each_pci_dev(dev) {
2012 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2013 continue;
2014 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2015 continue;
Alan Coxc6996bd2012-04-25 14:33:48 +01002016 /* We don't want to poke around undefined i740 registers */
2017 if (is_i740(dev))
2018 continue;
Matthew Garrett74a365b2009-03-19 21:35:39 +00002019 pci_read_config_dword(dev, 0xfc, &address);
2020 if (!address)
2021 continue;
Alan Coxc6996bd2012-04-25 14:33:48 +01002022 opregion = 1;
Matthew Garrett74a365b2009-03-19 21:35:39 +00002023 }
Alan Coxc6996bd2012-04-25 14:33:48 +01002024 return opregion;
Matthew Garrett74a365b2009-03-19 21:35:39 +00002025}
2026
Rafael J. Wysocki8e5c2b72013-07-25 21:43:39 +02002027int acpi_video_register(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002028{
Rafael J. Wysocki8e5c2b72013-07-25 21:43:39 +02002029 int result = 0;
Zhao Yakui86e437f2009-06-16 11:23:13 +08002030 if (register_count) {
2031 /*
Rafael J. Wysocki8e5c2b72013-07-25 21:43:39 +02002032 * if the function of acpi_video_register is already called,
2033 * don't register the acpi_vide_bus again and return no error.
Zhao Yakui86e437f2009-06-16 11:23:13 +08002034 */
2035 return 0;
2036 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002037
Aaron Lu67b662e2013-10-11 21:27:44 +08002038 mutex_init(&video_list_lock);
2039 INIT_LIST_HEAD(&video_bus_head);
2040
Linus Torvalds1da177e2005-04-16 15:20:36 -07002041 result = acpi_bus_register_driver(&acpi_video_bus);
Zhang Rui39fe3942010-10-08 13:55:11 +08002042 if (result < 0)
Patrick Mocheld550d982006-06-27 00:41:40 -04002043 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002044
Zhao Yakui86e437f2009-06-16 11:23:13 +08002045 /*
2046 * When the acpi_video_bus is loaded successfully, increase
2047 * the counter reference.
2048 */
2049 register_count = 1;
2050
Patrick Mocheld550d982006-06-27 00:41:40 -04002051 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002052}
Rafael J. Wysocki8e5c2b72013-07-25 21:43:39 +02002053EXPORT_SYMBOL(acpi_video_register);
Matthew Garrett74a365b2009-03-19 21:35:39 +00002054
Zhao Yakui86e437f2009-06-16 11:23:13 +08002055void acpi_video_unregister(void)
2056{
2057 if (!register_count) {
2058 /*
2059 * If the acpi video bus is already unloaded, don't
2060 * unload it again and return directly.
2061 */
2062 return;
2063 }
2064 acpi_bus_unregister_driver(&acpi_video_bus);
2065
Zhao Yakui86e437f2009-06-16 11:23:13 +08002066 register_count = 0;
2067
2068 return;
2069}
2070EXPORT_SYMBOL(acpi_video_unregister);
2071
Hans de Goede1b7f37e2014-05-17 10:48:01 +02002072void acpi_video_unregister_backlight(void)
2073{
2074 struct acpi_video_bus *video;
2075
2076 if (!register_count)
2077 return;
2078
2079 mutex_lock(&video_list_lock);
2080 list_for_each_entry(video, &video_bus_head, entry)
2081 acpi_video_bus_unregister_backlight(video);
2082 mutex_unlock(&video_list_lock);
2083}
2084EXPORT_SYMBOL(acpi_video_unregister_backlight);
2085
Matthew Garrett74a365b2009-03-19 21:35:39 +00002086/*
2087 * This is kind of nasty. Hardware using Intel chipsets may require
2088 * the video opregion code to be run first in order to initialise
2089 * state before any ACPI video calls are made. To handle this we defer
2090 * registration of the video class until the opregion code has run.
2091 */
2092
2093static int __init acpi_video_init(void)
2094{
Zhang Rui45cb50e2009-04-24 12:13:18 -04002095 dmi_check_system(video_dmi_table);
2096
Matthew Garrett74a365b2009-03-19 21:35:39 +00002097 if (intel_opregion_present())
2098 return 0;
2099
2100 return acpi_video_register();
2101}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002102
Zhao Yakui86e437f2009-06-16 11:23:13 +08002103static void __exit acpi_video_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002104{
Zhao Yakui86e437f2009-06-16 11:23:13 +08002105 acpi_video_unregister();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002106
Patrick Mocheld550d982006-06-27 00:41:40 -04002107 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002108}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002109
2110module_init(acpi_video_init);
2111module_exit(acpi_video_exit);