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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 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070020 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
21 */
22
23#include <linux/kernel.h>
24#include <linux/module.h>
25#include <linux/init.h>
26#include <linux/types.h>
27#include <linux/list.h>
Dmitry Torokhovbbac81f2007-11-05 11:43:32 -050028#include <linux/mutex.h>
Luming Yue9dab192007-08-20 18:23:53 +080029#include <linux/input.h>
Yu Luming2f3d0002006-11-11 02:40:34 +080030#include <linux/backlight.h>
Zhang Rui702ed512008-01-17 15:51:22 +080031#include <linux/thermal.h>
Zhang Rui935e5f22008-12-11 16:24:52 -050032#include <linux/sort.h>
Matthew Garrett74a365b2009-03-19 21:35:39 +000033#include <linux/pci.h>
34#include <linux/pci_ids.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090035#include <linux/slab.h>
Len Browneb27cae2009-07-06 23:40:19 -040036#include <linux/dmi.h>
Rafael J. Wysockiac7729d2010-04-05 01:43:51 +020037#include <linux/suspend.h>
Lv Zheng8b484632013-12-03 08:49:16 +080038#include <linux/acpi.h>
Matthew Garrette92a7162010-01-12 14:17:03 -050039#include <acpi/video.h>
Lv Zheng8b484632013-12-03 08:49:16 +080040#include <asm/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
Hans de Goede14ca7a472015-06-16 16:27:47 +020042#define PREFIX "ACPI: "
Rafael J. Wysocki8c5bd7a2013-07-18 02:08:06 +020043
Linus Torvalds1da177e2005-04-16 15:20:36 -070044#define ACPI_VIDEO_BUS_NAME "Video Bus"
45#define ACPI_VIDEO_DEVICE_NAME "Video Device"
46#define ACPI_VIDEO_NOTIFY_SWITCH 0x80
47#define ACPI_VIDEO_NOTIFY_PROBE 0x81
48#define ACPI_VIDEO_NOTIFY_CYCLE 0x82
49#define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83
50#define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84
51
Thomas Tuttlef4715182006-12-19 12:56:14 -080052#define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x85
53#define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x86
54#define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x87
55#define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x88
56#define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x89
Linus Torvalds1da177e2005-04-16 15:20:36 -070057
Yu Luming2f3d0002006-11-11 02:40:34 +080058#define MAX_NAME_LEN 20
Linus Torvalds1da177e2005-04-16 15:20:36 -070059
Linus Torvalds1da177e2005-04-16 15:20:36 -070060#define _COMPONENT ACPI_VIDEO_COMPONENT
Len Brownf52fd662007-02-12 22:42:12 -050061ACPI_MODULE_NAME("video");
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
Len Brownf52fd662007-02-12 22:42:12 -050063MODULE_AUTHOR("Bruno Ducrot");
Len Brown7cda93e2007-02-12 23:50:02 -050064MODULE_DESCRIPTION("ACPI Video Driver");
Linus Torvalds1da177e2005-04-16 15:20:36 -070065MODULE_LICENSE("GPL");
66
Rafael J. Wysocki28437682014-07-14 19:35:45 +020067static bool brightness_switch_enabled = 1;
Zhang Rui8a681a42008-01-25 14:47:49 +080068module_param(brightness_switch_enabled, bool, 0644);
69
Zhang Ruic504f8c2009-12-30 15:59:23 +080070/*
71 * By default, we don't allow duplicate ACPI video bus devices
72 * under the same VGA controller
73 */
Rusty Russell90ab5ee2012-01-13 09:32:20 +103074static bool allow_duplicates;
Zhang Ruic504f8c2009-12-30 15:59:23 +080075module_param(allow_duplicates, bool, 0644);
76
Hans de Goede654a1822015-06-09 10:32:25 +020077static int disable_backlight_sysfs_if = -1;
78module_param(disable_backlight_sysfs_if, int, 0444);
79
Hans de Goede05bc59a2015-12-22 19:09:51 +010080#define REPORT_OUTPUT_KEY_EVENTS 0x01
81#define REPORT_BRIGHTNESS_KEY_EVENTS 0x02
82static int report_key_events = -1;
83module_param(report_key_events, int, 0644);
84MODULE_PARM_DESC(report_key_events,
85 "0: none, 1: output changes, 2: brightness changes, 3: all");
86
Aaron Lue50b9be2015-10-28 15:09:23 +080087static bool device_id_scheme = false;
88module_param(device_id_scheme, bool, 0444);
89
90static bool only_lcd = false;
91module_param(only_lcd, bool, 0444);
92
Hans de Goede970530c2016-01-14 09:41:45 +010093static int register_count;
94static DEFINE_MUTEX(register_count_mutex);
Hans de Goede14e93552016-01-14 09:41:46 +010095static DEFINE_MUTEX(video_list_lock);
96static LIST_HEAD(video_bus_head);
Len Brown4be44fc2005-08-05 00:44:28 -040097static int acpi_video_bus_add(struct acpi_device *device);
Rafael J. Wysocki51fac832013-01-24 00:24:48 +010098static int acpi_video_bus_remove(struct acpi_device *device);
Bjorn Helgaas70155582009-04-07 15:37:11 +000099static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
Hans de Goede93a291d2015-06-16 16:27:52 +0200100void acpi_video_detect_exit(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101
Thomas Renninger1ba90e32007-07-23 14:44:41 +0200102static const struct acpi_device_id video_device_ids[] = {
103 {ACPI_VIDEO_HID, 0},
104 {"", 0},
105};
106MODULE_DEVICE_TABLE(acpi, video_device_ids);
107
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108static struct acpi_driver acpi_video_bus = {
Len Brownc2b67052007-02-12 23:33:40 -0500109 .name = "video",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 .class = ACPI_VIDEO_CLASS,
Thomas Renninger1ba90e32007-07-23 14:44:41 +0200111 .ids = video_device_ids,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 .ops = {
113 .add = acpi_video_bus_add,
114 .remove = acpi_video_bus_remove,
Bjorn Helgaas70155582009-04-07 15:37:11 +0000115 .notify = acpi_video_bus_notify,
Len Brown4be44fc2005-08-05 00:44:28 -0400116 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117};
118
119struct acpi_video_bus_flags {
Len Brown4be44fc2005-08-05 00:44:28 -0400120 u8 multihead:1; /* can switch video heads */
121 u8 rom:1; /* can retrieve a video rom */
122 u8 post:1; /* can configure the head to */
123 u8 reserved:5;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124};
125
126struct acpi_video_bus_cap {
Felipe Contreras21fcb342013-08-01 18:43:59 -0500127 u8 _DOS:1; /* Enable/Disable output switching */
128 u8 _DOD:1; /* Enumerate all devices attached to display adapter */
129 u8 _ROM:1; /* Get ROM Data */
130 u8 _GPD:1; /* Get POST Device */
131 u8 _SPD:1; /* Set POST Device */
132 u8 _VPO:1; /* Video POST Options */
Len Brown4be44fc2005-08-05 00:44:28 -0400133 u8 reserved:2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134};
135
Len Brown4be44fc2005-08-05 00:44:28 -0400136struct acpi_video_device_attrib {
137 u32 display_index:4; /* A zero-based instance of the Display */
Felipe Contreras21fcb342013-08-01 18:43:59 -0500138 u32 display_port_attachment:4; /* This field differentiates the display type */
139 u32 display_type:4; /* Describe the specific type in use */
140 u32 vendor_specific:4; /* Chipset Vendor Specific */
141 u32 bios_can_detect:1; /* BIOS can detect the device */
142 u32 depend_on_vga:1; /* Non-VGA output device whose power is related to
Len Brown4be44fc2005-08-05 00:44:28 -0400143 the VGA device. */
Felipe Contreras21fcb342013-08-01 18:43:59 -0500144 u32 pipe_id:3; /* For VGA multiple-head devices. */
145 u32 reserved:10; /* Must be 0 */
146 u32 device_id_scheme:1; /* Device ID Scheme */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147};
148
149struct acpi_video_enumerated_device {
150 union {
151 u32 int_val;
Len Brown4be44fc2005-08-05 00:44:28 -0400152 struct acpi_video_device_attrib attrib;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 } value;
154 struct acpi_video_device *bind_info;
155};
156
157struct acpi_video_bus {
Patrick Mochele6afa0d2006-05-19 16:54:40 -0400158 struct acpi_device *device;
Hans de Goede99678ed2014-05-15 13:22:33 +0200159 bool backlight_registered;
Len Brown4be44fc2005-08-05 00:44:28 -0400160 u8 dos_setting;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 struct acpi_video_enumerated_device *attached_array;
Len Brown4be44fc2005-08-05 00:44:28 -0400162 u8 attached_count;
Aaron Lub4df4632014-12-15 16:01:29 +0800163 u8 child_count;
Len Brown4be44fc2005-08-05 00:44:28 -0400164 struct acpi_video_bus_cap cap;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 struct acpi_video_bus_flags flags;
Len Brown4be44fc2005-08-05 00:44:28 -0400166 struct list_head video_device_list;
Dmitry Torokhovbbac81f2007-11-05 11:43:32 -0500167 struct mutex device_list_lock; /* protects video_device_list */
Aaron Lu67b662e2013-10-11 21:27:44 +0800168 struct list_head entry;
Luming Yue9dab192007-08-20 18:23:53 +0800169 struct input_dev *input;
170 char phys[32]; /* for input device */
Rafael J. Wysockiac7729d2010-04-05 01:43:51 +0200171 struct notifier_block pm_nb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172};
173
174struct acpi_video_device_flags {
Len Brown4be44fc2005-08-05 00:44:28 -0400175 u8 crt:1;
176 u8 lcd:1;
177 u8 tvout:1;
Rui Zhang82cae992007-01-03 23:40:53 -0500178 u8 dvi:1;
Len Brown4be44fc2005-08-05 00:44:28 -0400179 u8 bios:1;
180 u8 unknown:1;
Aaron Lu91e13aa2013-04-25 02:47:49 +0000181 u8 notify:1;
182 u8 reserved:1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183};
184
185struct acpi_video_device_cap {
Felipe Contreras21fcb342013-08-01 18:43:59 -0500186 u8 _ADR:1; /* Return the unique ID */
187 u8 _BCL:1; /* Query list of brightness control levels supported */
188 u8 _BCM:1; /* Set the brightness level */
Yu Luming2f3d0002006-11-11 02:40:34 +0800189 u8 _BQC:1; /* Get current brightness level */
Zhang Ruic60d6382009-03-18 16:27:18 +0800190 u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
Felipe Contreras21fcb342013-08-01 18:43:59 -0500191 u8 _DDC:1; /* Return the EDID for this device */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192};
193
Zhang Ruid32f6942009-03-18 16:27:12 +0800194struct acpi_video_brightness_flags {
195 u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
Felipe Contreras21fcb342013-08-01 18:43:59 -0500196 u8 _BCL_reversed:1; /* _BCL package is in a reversed order */
Zhang Rui1a7c6182009-03-18 16:27:16 +0800197 u8 _BQC_use_index:1; /* _BQC returns an index value */
Zhang Ruid32f6942009-03-18 16:27:12 +0800198};
199
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200struct acpi_video_device_brightness {
Len Brown4be44fc2005-08-05 00:44:28 -0400201 int curr;
202 int count;
203 int *levels;
Zhang Ruid32f6942009-03-18 16:27:12 +0800204 struct acpi_video_brightness_flags flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205};
206
207struct acpi_video_device {
Len Brown4be44fc2005-08-05 00:44:28 -0400208 unsigned long device_id;
209 struct acpi_video_device_flags flags;
210 struct acpi_video_device_cap cap;
211 struct list_head entry;
Linus Torvalds8ab58e82014-07-18 14:32:51 +0200212 struct delayed_work switch_brightness_work;
213 int switch_brightness_event;
Len Brown4be44fc2005-08-05 00:44:28 -0400214 struct acpi_video_bus *video;
215 struct acpi_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 struct acpi_video_device_brightness *brightness;
Yu Luming2f3d0002006-11-11 02:40:34 +0800217 struct backlight_device *backlight;
Dmitry Torokhov4a703a82009-08-29 23:03:16 -0400218 struct thermal_cooling_device *cooling_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219};
220
Jan Engelhardtb7171ae2009-01-12 00:08:19 +0100221static const char device_decode[][30] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 "motherboard VGA device",
223 "PCI VGA device",
224 "AGP VGA device",
225 "UNKNOWN",
226};
227
Len Brown4be44fc2005-08-05 00:44:28 -0400228static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
229static void acpi_video_device_rebind(struct acpi_video_bus *video);
230static void acpi_video_device_bind(struct acpi_video_bus *video,
231 struct acpi_video_device *device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232static int acpi_video_device_enumerate(struct acpi_video_bus *video);
Yu Luming2f3d0002006-11-11 02:40:34 +0800233static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
234 int level);
235static int acpi_video_device_lcd_get_level_current(
236 struct acpi_video_device *device,
Danny Baumanna89803d2013-03-19 16:22:50 +0000237 unsigned long long *level, bool raw);
Len Brown4be44fc2005-08-05 00:44:28 -0400238static int acpi_video_get_next_level(struct acpi_video_device *device,
239 u32 level_current, u32 event);
Linus Torvalds8ab58e82014-07-18 14:32:51 +0200240static void acpi_video_switch_brightness(struct work_struct *work);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241
Felipe Contreras21fcb342013-08-01 18:43:59 -0500242/* backlight device sysfs support */
Yu Luming2f3d0002006-11-11 02:40:34 +0800243static int acpi_video_get_brightness(struct backlight_device *bd)
244{
Matthew Wilcox27663c52008-10-10 02:22:59 -0400245 unsigned long long cur_level;
Matthew Garrett38531e62007-12-26 02:03:26 +0000246 int i;
Felipe Contreras7c364e72013-08-03 22:15:21 +0200247 struct acpi_video_device *vd = bl_get_data(bd);
Zhang Ruic8890f92009-03-18 16:27:08 +0800248
Danny Baumanna89803d2013-03-19 16:22:50 +0000249 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
Zhang Ruic8890f92009-03-18 16:27:08 +0800250 return -EINVAL;
Matthew Garrett38531e62007-12-26 02:03:26 +0000251 for (i = 2; i < vd->brightness->count; i++) {
252 if (vd->brightness->levels[i] == cur_level)
Felipe Contreras21fcb342013-08-01 18:43:59 -0500253 /*
254 * The first two entries are special - see page 575
255 * of the ACPI spec 3.0
256 */
Felipe Contreras915ea7e2013-08-03 22:12:50 +0200257 return i - 2;
Matthew Garrett38531e62007-12-26 02:03:26 +0000258 }
259 return 0;
Yu Luming2f3d0002006-11-11 02:40:34 +0800260}
261
262static int acpi_video_set_brightness(struct backlight_device *bd)
263{
Zhang Rui24450c72009-03-18 16:27:10 +0800264 int request_level = bd->props.brightness + 2;
Felipe Contreras7c364e72013-08-03 22:15:21 +0200265 struct acpi_video_device *vd = bl_get_data(bd);
Zhang Rui24450c72009-03-18 16:27:10 +0800266
Linus Torvalds8ab58e82014-07-18 14:32:51 +0200267 cancel_delayed_work(&vd->switch_brightness_work);
Zhang Rui24450c72009-03-18 16:27:10 +0800268 return acpi_video_device_lcd_set_level(vd,
269 vd->brightness->levels[request_level]);
Yu Luming2f3d0002006-11-11 02:40:34 +0800270}
271
Lionel Debrouxacc24722010-11-16 14:14:02 +0100272static const struct backlight_ops acpi_backlight_ops = {
Richard Purdie599a52d2007-02-10 23:07:48 +0000273 .get_brightness = acpi_video_get_brightness,
274 .update_status = acpi_video_set_brightness,
275};
276
Zhang Rui702ed512008-01-17 15:51:22 +0800277/* thermal cooling device callbacks */
Dmitry Torokhov4a703a82009-08-29 23:03:16 -0400278static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
Matthew Garrett6503e5d2008-11-27 17:48:13 +0000279 long *state)
Zhang Rui702ed512008-01-17 15:51:22 +0800280{
Dmitry Torokhov4a703a82009-08-29 23:03:16 -0400281 struct acpi_device *device = cooling_dev->devdata;
Zhang Rui702ed512008-01-17 15:51:22 +0800282 struct acpi_video_device *video = acpi_driver_data(device);
283
Matthew Garrett6503e5d2008-11-27 17:48:13 +0000284 *state = video->brightness->count - 3;
285 return 0;
Zhang Rui702ed512008-01-17 15:51:22 +0800286}
287
Dmitry Torokhov4a703a82009-08-29 23:03:16 -0400288static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
Matthew Garrett6503e5d2008-11-27 17:48:13 +0000289 long *state)
Zhang Rui702ed512008-01-17 15:51:22 +0800290{
Dmitry Torokhov4a703a82009-08-29 23:03:16 -0400291 struct acpi_device *device = cooling_dev->devdata;
Zhang Rui702ed512008-01-17 15:51:22 +0800292 struct acpi_video_device *video = acpi_driver_data(device);
Matthew Wilcox27663c52008-10-10 02:22:59 -0400293 unsigned long long level;
Matthew Garrett6503e5d2008-11-27 17:48:13 +0000294 int offset;
Zhang Rui702ed512008-01-17 15:51:22 +0800295
Danny Baumanna89803d2013-03-19 16:22:50 +0000296 if (acpi_video_device_lcd_get_level_current(video, &level, false))
Zhang Ruic8890f92009-03-18 16:27:08 +0800297 return -EINVAL;
Matthew Garrett6503e5d2008-11-27 17:48:13 +0000298 for (offset = 2; offset < video->brightness->count; offset++)
299 if (level == video->brightness->levels[offset]) {
300 *state = video->brightness->count - offset - 1;
301 return 0;
302 }
Zhang Rui702ed512008-01-17 15:51:22 +0800303
304 return -EINVAL;
305}
306
307static int
Dmitry Torokhov4a703a82009-08-29 23:03:16 -0400308video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
Zhang Rui702ed512008-01-17 15:51:22 +0800309{
Dmitry Torokhov4a703a82009-08-29 23:03:16 -0400310 struct acpi_device *device = cooling_dev->devdata;
Zhang Rui702ed512008-01-17 15:51:22 +0800311 struct acpi_video_device *video = acpi_driver_data(device);
312 int level;
313
Felipe Contreras915ea7e2013-08-03 22:12:50 +0200314 if (state >= video->brightness->count - 2)
Zhang Rui702ed512008-01-17 15:51:22 +0800315 return -EINVAL;
316
317 state = video->brightness->count - state;
Felipe Contreras915ea7e2013-08-03 22:12:50 +0200318 level = video->brightness->levels[state - 1];
Zhang Rui702ed512008-01-17 15:51:22 +0800319 return acpi_video_device_lcd_set_level(video, level);
320}
321
Vasiliy Kulikov9c8b04b2011-06-25 21:07:52 +0400322static const struct thermal_cooling_device_ops video_cooling_ops = {
Zhang Rui702ed512008-01-17 15:51:22 +0800323 .get_max_state = video_get_max_state,
324 .get_cur_state = video_get_cur_state,
325 .set_cur_state = video_set_cur_state,
326};
327
Felipe Contreras21fcb342013-08-01 18:43:59 -0500328/*
329 * --------------------------------------------------------------------------
330 * Video Management
331 * --------------------------------------------------------------------------
332 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334static int
Len Brown4be44fc2005-08-05 00:44:28 -0400335acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
336 union acpi_object **levels)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337{
Len Brown4be44fc2005-08-05 00:44:28 -0400338 int status;
339 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
340 union acpi_object *obj;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342
343 *levels = NULL;
344
Patrick Mochel90130262006-05-19 16:54:48 -0400345 status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 if (!ACPI_SUCCESS(status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400347 return status;
Len Brown4be44fc2005-08-05 00:44:28 -0400348 obj = (union acpi_object *)buffer.pointer;
Adrian Bunk6665bda2006-03-11 10:12:00 -0500349 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
Len Brown64684632006-06-26 23:41:38 -0400350 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 status = -EFAULT;
352 goto err;
353 }
354
355 *levels = obj;
356
Patrick Mocheld550d982006-06-27 00:41:40 -0400357 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358
Felipe Contreras915ea7e2013-08-03 22:12:50 +0200359err:
Jesper Juhl6044ec82005-11-07 01:01:32 -0800360 kfree(buffer.pointer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361
Patrick Mocheld550d982006-06-27 00:41:40 -0400362 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363}
364
365static int
Len Brown4be44fc2005-08-05 00:44:28 -0400366acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367{
Zhang Rui24450c72009-03-18 16:27:10 +0800368 int status;
Zhang Rui9e6dada2008-12-31 10:58:48 +0800369 int state;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370
Jiang Liu0db98202013-06-29 00:24:39 +0800371 status = acpi_execute_simple_method(device->dev->handle,
372 "_BCM", level);
Zhang Rui24450c72009-03-18 16:27:10 +0800373 if (ACPI_FAILURE(status)) {
374 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
375 return -EIO;
376 }
377
Alexey Starikovskiy4500ca82007-09-03 16:29:58 +0400378 device->brightness->curr = level;
Zhang Rui9e6dada2008-12-31 10:58:48 +0800379 for (state = 2; state < device->brightness->count; state++)
Zhang Rui24450c72009-03-18 16:27:10 +0800380 if (level == device->brightness->levels[state]) {
Zhang Rui1a7c6182009-03-18 16:27:16 +0800381 if (device->backlight)
382 device->backlight->props.brightness = state - 2;
Zhang Rui24450c72009-03-18 16:27:10 +0800383 return 0;
384 }
Zhang Rui9e6dada2008-12-31 10:58:48 +0800385
Zhang Rui24450c72009-03-18 16:27:10 +0800386 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
387 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388}
389
Zhang Rui45cb50e2009-04-24 12:13:18 -0400390/*
391 * For some buggy _BQC methods, we need to add a constant value to
392 * the _BQC return value to get the actual current brightness level
393 */
394
395static int bqc_offset_aml_bug_workaround;
Hans de Goede7ee33ba2015-06-16 16:27:53 +0200396static int video_set_bqc_offset(const struct dmi_system_id *d)
Zhang Rui45cb50e2009-04-24 12:13:18 -0400397{
398 bqc_offset_aml_bug_workaround = 9;
399 return 0;
400}
401
Hans de Goede7ee33ba2015-06-16 16:27:53 +0200402static int video_disable_backlight_sysfs_if(
Hans de Goede654a1822015-06-09 10:32:25 +0200403 const struct dmi_system_id *d)
404{
405 if (disable_backlight_sysfs_if == -1)
406 disable_backlight_sysfs_if = 1;
407 return 0;
408}
409
Aaron Lue50b9be2015-10-28 15:09:23 +0800410static int video_set_device_id_scheme(const struct dmi_system_id *d)
411{
412 device_id_scheme = true;
413 return 0;
414}
415
416static int video_enable_only_lcd(const struct dmi_system_id *d)
417{
418 only_lcd = true;
419 return 0;
420}
421
Hans de Goede4b4b3b22015-12-22 19:09:52 +0100422static int video_set_report_key_events(const struct dmi_system_id *id)
423{
424 if (report_key_events == -1)
425 report_key_events = (uintptr_t)id->driver_data;
426 return 0;
427}
428
Hans de Goede7ee33ba2015-06-16 16:27:53 +0200429static struct dmi_system_id video_dmi_table[] = {
Zhang Rui45cb50e2009-04-24 12:13:18 -0400430 /*
431 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
432 */
433 {
434 .callback = video_set_bqc_offset,
435 .ident = "Acer Aspire 5720",
436 .matches = {
437 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
438 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
439 },
440 },
Len Brown5afc4ab2009-05-07 21:11:56 -0400441 {
442 .callback = video_set_bqc_offset,
443 .ident = "Acer Aspire 5710Z",
444 .matches = {
445 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
446 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
447 },
448 },
Zhang Rui34ac2722009-05-26 23:35:34 -0400449 {
450 .callback = video_set_bqc_offset,
451 .ident = "eMachines E510",
452 .matches = {
453 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
454 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
455 },
456 },
Zhang Rui93bcece2009-05-19 15:08:41 -0400457 {
458 .callback = video_set_bqc_offset,
459 .ident = "Acer Aspire 5315",
460 .matches = {
461 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
462 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
463 },
464 },
Zhang Rui152a4e62009-06-22 11:31:18 +0800465 {
466 .callback = video_set_bqc_offset,
467 .ident = "Acer Aspire 7720",
468 .matches = {
469 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
470 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
471 },
472 },
Hans de Goede5f240792014-08-28 10:20:46 +0200473
474 /*
Hans de Goede654a1822015-06-09 10:32:25 +0200475 * Some machines have a broken acpi-video interface for brightness
476 * control, but still need an acpi_video_device_lcd_set_level() call
477 * on resume to turn the backlight power on. We Enable backlight
478 * control on these systems, but do not register a backlight sysfs
479 * as brightness control does not work.
480 */
481 {
Hans de Goedede588b82016-01-11 14:46:17 +0100482 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
483 .callback = video_disable_backlight_sysfs_if,
484 .ident = "Toshiba Portege R700",
485 .matches = {
486 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
487 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R700"),
488 },
489 },
490 {
Hans de Goede654a1822015-06-09 10:32:25 +0200491 /* https://bugs.freedesktop.org/show_bug.cgi?id=82634 */
492 .callback = video_disable_backlight_sysfs_if,
493 .ident = "Toshiba Portege R830",
494 .matches = {
495 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
496 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R830"),
497 },
498 },
Hans de Goedeb21f2e82016-01-14 14:24:39 +0100499 {
500 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
501 .callback = video_disable_backlight_sysfs_if,
502 .ident = "Toshiba Satellite R830",
503 .matches = {
504 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
505 DMI_MATCH(DMI_PRODUCT_NAME, "SATELLITE R830"),
506 },
507 },
Aaron Lue50b9be2015-10-28 15:09:23 +0800508 /*
509 * Some machine's _DOD IDs don't have bit 31(Device ID Scheme) set
510 * but the IDs actually follow the Device ID Scheme.
511 */
512 {
513 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
514 .callback = video_set_device_id_scheme,
515 .ident = "ESPRIMO Mobile M9410",
516 .matches = {
517 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
518 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"),
519 },
520 },
521 /*
522 * Some machines have multiple video output devices, but only the one
523 * that is the type of LCD can do the backlight control so we should not
524 * register backlight interface for other video output devices.
525 */
526 {
527 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
528 .callback = video_enable_only_lcd,
529 .ident = "ESPRIMO Mobile M9410",
530 .matches = {
531 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
532 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"),
533 },
534 },
Hans de Goede4b4b3b22015-12-22 19:09:52 +0100535 /*
536 * Some machines report wrong key events on the acpi-bus, suppress
537 * key event reporting on these. Note this is only intended to work
538 * around events which are plain wrong. In some cases we get double
539 * events, in this case acpi-video is considered the canonical source
540 * and the events from the other source should be filtered. E.g.
541 * by calling acpi_video_handles_brightness_key_presses() from the
542 * vendor acpi/wmi driver or by using /lib/udev/hwdb.d/60-keyboard.hwdb
543 */
544 {
545 .callback = video_set_report_key_events,
546 .driver_data = (void *)((uintptr_t)REPORT_OUTPUT_KEY_EVENTS),
547 .ident = "Dell Vostro V131",
548 .matches = {
549 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
550 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
551 },
552 },
Zhang Rui45cb50e2009-04-24 12:13:18 -0400553 {}
554};
555
Danny Baumann994fa632013-03-19 16:22:52 +0000556static unsigned long long
557acpi_video_bqc_value_to_level(struct acpi_video_device *device,
558 unsigned long long bqc_value)
559{
560 unsigned long long level;
561
562 if (device->brightness->flags._BQC_use_index) {
563 /*
564 * _BQC returns an index that doesn't account for
565 * the first 2 items with special meaning, so we need
566 * to compensate for that by offsetting ourselves
567 */
568 if (device->brightness->flags._BCL_reversed)
569 bqc_value = device->brightness->count - 3 - bqc_value;
570
571 level = device->brightness->levels[bqc_value + 2];
572 } else {
573 level = bqc_value;
574 }
575
576 level += bqc_offset_aml_bug_workaround;
577
578 return level;
579}
580
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581static int
Len Brown4be44fc2005-08-05 00:44:28 -0400582acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
Danny Baumanna89803d2013-03-19 16:22:50 +0000583 unsigned long long *level, bool raw)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584{
Zhang Ruic8890f92009-03-18 16:27:08 +0800585 acpi_status status = AE_OK;
Vladimir Serbinenko4e231fa2009-06-24 15:17:36 +0800586 int i;
Zhang Ruic8890f92009-03-18 16:27:08 +0800587
Zhang Ruic60d6382009-03-18 16:27:18 +0800588 if (device->cap._BQC || device->cap._BCQ) {
589 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
590
591 status = acpi_evaluate_integer(device->dev->handle, buf,
Zhang Ruic8890f92009-03-18 16:27:08 +0800592 NULL, level);
593 if (ACPI_SUCCESS(status)) {
Danny Baumanna89803d2013-03-19 16:22:50 +0000594 if (raw) {
595 /*
596 * Caller has indicated he wants the raw
597 * value returned by _BQC, so don't furtherly
598 * mess with the value.
599 */
600 return 0;
601 }
602
Danny Baumann994fa632013-03-19 16:22:52 +0000603 *level = acpi_video_bqc_value_to_level(device, *level);
Zhang Rui1a7c6182009-03-18 16:27:16 +0800604
Vladimir Serbinenko4e231fa2009-06-24 15:17:36 +0800605 for (i = 2; i < device->brightness->count; i++)
606 if (device->brightness->levels[i] == *level) {
607 device->brightness->curr = *level;
608 return 0;
Felipe Contreras915ea7e2013-08-03 22:12:50 +0200609 }
Danny Baumanna89803d2013-03-19 16:22:50 +0000610 /*
611 * BQC returned an invalid level.
612 * Stop using it.
613 */
614 ACPI_WARNING((AE_INFO,
615 "%s returned an invalid level",
616 buf));
617 device->cap._BQC = device->cap._BCQ = 0;
Zhang Ruic8890f92009-03-18 16:27:08 +0800618 } else {
Felipe Contreras21fcb342013-08-01 18:43:59 -0500619 /*
620 * Fixme:
Zhang Ruic8890f92009-03-18 16:27:08 +0800621 * should we return an error or ignore this failure?
622 * dev->brightness->curr is a cached value which stores
623 * the correct current backlight level in most cases.
624 * ACPI video backlight still works w/ buggy _BQC.
625 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
626 */
Zhang Ruic60d6382009-03-18 16:27:18 +0800627 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
628 device->cap._BQC = device->cap._BCQ = 0;
Zhang Ruic8890f92009-03-18 16:27:08 +0800629 }
630 }
631
Alexey Starikovskiy4500ca82007-09-03 16:29:58 +0400632 *level = device->brightness->curr;
Zhang Ruic8890f92009-03-18 16:27:08 +0800633 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634}
635
636static int
Len Brown4be44fc2005-08-05 00:44:28 -0400637acpi_video_device_EDID(struct acpi_video_device *device,
638 union acpi_object **edid, ssize_t length)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639{
Len Brown4be44fc2005-08-05 00:44:28 -0400640 int status;
641 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
642 union acpi_object *obj;
643 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
644 struct acpi_object_list args = { 1, &arg0 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646
647 *edid = NULL;
648
649 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400650 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651 if (length == 128)
652 arg0.integer.value = 1;
653 else if (length == 256)
654 arg0.integer.value = 2;
655 else
Patrick Mocheld550d982006-06-27 00:41:40 -0400656 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657
Patrick Mochel90130262006-05-19 16:54:48 -0400658 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400660 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200662 obj = buffer.pointer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663
664 if (obj && obj->type == ACPI_TYPE_BUFFER)
665 *edid = obj;
666 else {
Len Brown64684632006-06-26 23:41:38 -0400667 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668 status = -EFAULT;
669 kfree(obj);
670 }
671
Patrick Mocheld550d982006-06-27 00:41:40 -0400672 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673}
674
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675/* bus */
676
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677/*
678 * Arg:
Felipe Contreras21fcb342013-08-01 18:43:59 -0500679 * video : video bus device pointer
680 * bios_flag :
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681 * 0. The system BIOS should NOT automatically switch(toggle)
682 * the active display output.
683 * 1. The system BIOS should automatically switch (toggle) the
Julius Volz98fb8fe2007-02-20 16:38:40 +0100684 * active display output. No switch event.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685 * 2. The _DGS value should be locked.
686 * 3. The system BIOS should not automatically switch (toggle) the
687 * active display output, but instead generate the display switch
688 * event notify code.
689 * lcd_flag :
690 * 0. The system BIOS should automatically control the brightness level
Julius Volz98fb8fe2007-02-20 16:38:40 +0100691 * of the LCD when the power changes from AC to DC
Felipe Contreras21fcb342013-08-01 18:43:59 -0500692 * 1. The system BIOS should NOT automatically control the brightness
Julius Volz98fb8fe2007-02-20 16:38:40 +0100693 * level of the LCD when the power changes from AC to DC.
Felipe Contreras21fcb342013-08-01 18:43:59 -0500694 * Return Value:
Igor Murzovea9f8852012-03-30 21:32:08 +0400695 * -EINVAL wrong arg.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696 */
697
698static int
Len Brown4be44fc2005-08-05 00:44:28 -0400699acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700{
Igor Murzovea9f8852012-03-30 21:32:08 +0400701 acpi_status status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702
Zhang Ruib0373842012-06-20 09:48:43 +0800703 if (!video->cap._DOS)
704 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705
Igor Murzovea9f8852012-03-30 21:32:08 +0400706 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
707 return -EINVAL;
Jiang Liu0db98202013-06-29 00:24:39 +0800708 video->dos_setting = (lcd_flag << 2) | bios_flag;
709 status = acpi_execute_simple_method(video->device->handle, "_DOS",
710 (lcd_flag << 2) | bios_flag);
Igor Murzovea9f8852012-03-30 21:32:08 +0400711 if (ACPI_FAILURE(status))
712 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713
Igor Murzovea9f8852012-03-30 21:32:08 +0400714 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715}
716
717/*
Zhang Rui935e5f22008-12-11 16:24:52 -0500718 * Simple comparison function used to sort backlight levels.
719 */
720
721static int
722acpi_video_cmp_level(const void *a, const void *b)
723{
724 return *(int *)a - *(int *)b;
725}
726
727/*
Aaron Lua50188d2013-04-22 14:08:32 +0200728 * Decides if _BQC/_BCQ for this system is usable
729 *
730 * We do this by changing the level first and then read out the current
731 * brightness level, if the value does not match, find out if it is using
732 * index. If not, clear the _BQC/_BCQ capability.
733 */
734static int acpi_video_bqc_quirk(struct acpi_video_device *device,
735 int max_level, int current_level)
736{
737 struct acpi_video_device_brightness *br = device->brightness;
738 int result;
739 unsigned long long level;
740 int test_level;
741
742 /* don't mess with existing known broken systems */
743 if (bqc_offset_aml_bug_workaround)
744 return 0;
745
746 /*
747 * Some systems always report current brightness level as maximum
748 * through _BQC, we need to test another value for them.
749 */
Felipe Contrerasb3b301c2013-08-03 23:00:25 +0200750 test_level = current_level == max_level ? br->levels[3] : max_level;
Aaron Lua50188d2013-04-22 14:08:32 +0200751
752 result = acpi_video_device_lcd_set_level(device, test_level);
753 if (result)
754 return result;
755
756 result = acpi_video_device_lcd_get_level_current(device, &level, true);
757 if (result)
758 return result;
759
760 if (level != test_level) {
761 /* buggy _BQC found, need to find out if it uses index */
762 if (level < br->count) {
763 if (br->flags._BCL_reversed)
764 level = br->count - 3 - level;
765 if (br->levels[level + 2] == test_level)
766 br->flags._BQC_use_index = 1;
767 }
768
769 if (!br->flags._BQC_use_index)
770 device->cap._BQC = device->cap._BCQ = 0;
771 }
772
773 return 0;
774}
775
776
777/*
Felipe Contreras21fcb342013-08-01 18:43:59 -0500778 * Arg:
779 * device : video output device (LCD, CRT, ..)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780 *
781 * Return Value:
Julia Jomantaite469778c2008-06-23 22:50:42 +0100782 * Maximum brightness level
783 *
784 * Allocate and initialize device->brightness.
785 */
786
787static int
788acpi_video_init_brightness(struct acpi_video_device *device)
789{
790 union acpi_object *obj = NULL;
Zhang Ruid32f6942009-03-18 16:27:12 +0800791 int i, max_level = 0, count = 0, level_ac_battery = 0;
Zhang Rui1a7c6182009-03-18 16:27:16 +0800792 unsigned long long level, level_old;
Julia Jomantaite469778c2008-06-23 22:50:42 +0100793 union acpi_object *o;
794 struct acpi_video_device_brightness *br = NULL;
Zhang Rui1a7c6182009-03-18 16:27:16 +0800795 int result = -EINVAL;
Hans de Goedebd8ba202014-02-13 16:32:51 +0100796 u32 value;
Julia Jomantaite469778c2008-06-23 22:50:42 +0100797
798 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
799 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
800 "LCD brightness level\n"));
801 goto out;
802 }
803
804 if (obj->package.count < 2)
805 goto out;
806
807 br = kzalloc(sizeof(*br), GFP_KERNEL);
808 if (!br) {
809 printk(KERN_ERR "can't allocate memory\n");
Zhang Rui1a7c6182009-03-18 16:27:16 +0800810 result = -ENOMEM;
Julia Jomantaite469778c2008-06-23 22:50:42 +0100811 goto out;
812 }
813
Zhang Ruid32f6942009-03-18 16:27:12 +0800814 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
Julia Jomantaite469778c2008-06-23 22:50:42 +0100815 GFP_KERNEL);
Zhang Rui1a7c6182009-03-18 16:27:16 +0800816 if (!br->levels) {
817 result = -ENOMEM;
Julia Jomantaite469778c2008-06-23 22:50:42 +0100818 goto out_free;
Zhang Rui1a7c6182009-03-18 16:27:16 +0800819 }
Julia Jomantaite469778c2008-06-23 22:50:42 +0100820
821 for (i = 0; i < obj->package.count; i++) {
822 o = (union acpi_object *)&obj->package.elements[i];
823 if (o->type != ACPI_TYPE_INTEGER) {
824 printk(KERN_ERR PREFIX "Invalid data\n");
825 continue;
826 }
Hans de Goedebd8ba202014-02-13 16:32:51 +0100827 value = (u32) o->integer.value;
828 /* Skip duplicate entries */
829 if (count > 2 && br->levels[count - 1] == value)
830 continue;
831
832 br->levels[count] = value;
Julia Jomantaite469778c2008-06-23 22:50:42 +0100833
834 if (br->levels[count] > max_level)
835 max_level = br->levels[count];
836 count++;
837 }
838
Zhang Ruid32f6942009-03-18 16:27:12 +0800839 /*
840 * some buggy BIOS don't export the levels
841 * when machine is on AC/Battery in _BCL package.
842 * In this case, the first two elements in _BCL packages
843 * are also supported brightness levels that OS should take care of.
844 */
Zhang Rui90af2cf2009-04-14 11:02:18 +0800845 for (i = 2; i < count; i++) {
846 if (br->levels[i] == br->levels[0])
Zhang Ruid32f6942009-03-18 16:27:12 +0800847 level_ac_battery++;
Zhang Rui90af2cf2009-04-14 11:02:18 +0800848 if (br->levels[i] == br->levels[1])
849 level_ac_battery++;
850 }
Zhang Rui935e5f22008-12-11 16:24:52 -0500851
Zhang Ruid32f6942009-03-18 16:27:12 +0800852 if (level_ac_battery < 2) {
853 level_ac_battery = 2 - level_ac_battery;
854 br->flags._BCL_no_ac_battery_levels = 1;
855 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
856 br->levels[i] = br->levels[i - level_ac_battery];
857 count += level_ac_battery;
858 } else if (level_ac_battery > 2)
Colin Ian Kingbf6787e2012-11-29 11:53:13 +0000859 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
Zhang Ruid32f6942009-03-18 16:27:12 +0800860
Zhang Ruid80fb992009-03-18 16:27:14 +0800861 /* Check if the _BCL package is in a reversed order */
862 if (max_level == br->levels[2]) {
863 br->flags._BCL_reversed = 1;
864 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
865 acpi_video_cmp_level, NULL);
866 } else if (max_level != br->levels[count - 1])
867 ACPI_ERROR((AE_INFO,
Colin Ian Kingbf6787e2012-11-29 11:53:13 +0000868 "Found unordered _BCL package"));
Julia Jomantaite469778c2008-06-23 22:50:42 +0100869
870 br->count = count;
871 device->brightness = br;
Zhang Rui1a7c6182009-03-18 16:27:16 +0800872
Zhang Rui1a7c6182009-03-18 16:27:16 +0800873 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
Zhang Rui90c53ca2009-08-31 12:39:54 -0400874 br->curr = level = max_level;
Zhang Ruie047cca2009-04-09 14:24:35 +0800875
876 if (!device->cap._BQC)
877 goto set_level;
878
Danny Baumanna89803d2013-03-19 16:22:50 +0000879 result = acpi_video_device_lcd_get_level_current(device,
880 &level_old, true);
Zhang Rui1a7c6182009-03-18 16:27:16 +0800881 if (result)
882 goto out_free_levels;
883
Aaron Lua50188d2013-04-22 14:08:32 +0200884 result = acpi_video_bqc_quirk(device, max_level, level_old);
885 if (result)
886 goto out_free_levels;
Zhang Ruie047cca2009-04-09 14:24:35 +0800887 /*
Aaron Lua50188d2013-04-22 14:08:32 +0200888 * cap._BQC may get cleared due to _BQC is found to be broken
889 * in acpi_video_bqc_quirk, so check again here.
Zhang Ruie047cca2009-04-09 14:24:35 +0800890 */
Aaron Lua50188d2013-04-22 14:08:32 +0200891 if (!device->cap._BQC)
892 goto set_level;
Zhang Rui1a7c6182009-03-18 16:27:16 +0800893
Aaron Lu545ef362013-11-15 14:39:12 +0800894 level = acpi_video_bqc_value_to_level(device, level_old);
895 /*
896 * On some buggy laptops, _BQC returns an uninitialized
897 * value when invoked for the first time, i.e.
898 * level_old is invalid (no matter whether it's a level
899 * or an index). Set the backlight to max_level in this case.
900 */
901 for (i = 2; i < br->count; i++)
902 if (level == br->levels[i])
903 break;
904 if (i == br->count || !level)
905 level = max_level;
Zhang Ruie047cca2009-04-09 14:24:35 +0800906
Zhang Ruie047cca2009-04-09 14:24:35 +0800907set_level:
Zhang Rui90c53ca2009-08-31 12:39:54 -0400908 result = acpi_video_device_lcd_set_level(device, level);
Zhang Ruie047cca2009-04-09 14:24:35 +0800909 if (result)
910 goto out_free_levels;
Zhang Rui1a7c6182009-03-18 16:27:16 +0800911
Zhang Ruid32f6942009-03-18 16:27:12 +0800912 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
913 "found %d brightness levels\n", count - 2));
Julia Jomantaite469778c2008-06-23 22:50:42 +0100914 kfree(obj);
Zhang Rui1a7c6182009-03-18 16:27:16 +0800915 return result;
Julia Jomantaite469778c2008-06-23 22:50:42 +0100916
917out_free_levels:
918 kfree(br->levels);
919out_free:
920 kfree(br);
921out:
922 device->brightness = NULL;
923 kfree(obj);
Zhang Rui1a7c6182009-03-18 16:27:16 +0800924 return result;
Julia Jomantaite469778c2008-06-23 22:50:42 +0100925}
926
927/*
928 * Arg:
929 * device : video output device (LCD, CRT, ..)
930 *
931 * Return Value:
Felipe Contreras21fcb342013-08-01 18:43:59 -0500932 * None
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933 *
Julius Volz98fb8fe2007-02-20 16:38:40 +0100934 * Find out all required AML methods defined under the output
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935 * device.
936 */
937
Len Brown4be44fc2005-08-05 00:44:28 -0400938static void acpi_video_device_find_cap(struct acpi_video_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939{
Jiang Liu952c63e2013-06-29 00:24:38 +0800940 if (acpi_has_method(device->dev->handle, "_ADR"))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941 device->cap._ADR = 1;
Jiang Liu952c63e2013-06-29 00:24:38 +0800942 if (acpi_has_method(device->dev->handle, "_BCL"))
Len Brown4be44fc2005-08-05 00:44:28 -0400943 device->cap._BCL = 1;
Jiang Liu952c63e2013-06-29 00:24:38 +0800944 if (acpi_has_method(device->dev->handle, "_BCM"))
Len Brown4be44fc2005-08-05 00:44:28 -0400945 device->cap._BCM = 1;
Jiang Liu952c63e2013-06-29 00:24:38 +0800946 if (acpi_has_method(device->dev->handle, "_BQC")) {
Yu Luming2f3d0002006-11-11 02:40:34 +0800947 device->cap._BQC = 1;
Jiang Liu952c63e2013-06-29 00:24:38 +0800948 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
Zhang Ruic60d6382009-03-18 16:27:18 +0800949 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
950 device->cap._BCQ = 1;
951 }
952
Jiang Liu952c63e2013-06-29 00:24:38 +0800953 if (acpi_has_method(device->dev->handle, "_DDC"))
Len Brown4be44fc2005-08-05 00:44:28 -0400954 device->cap._DDC = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955}
956
957/*
Felipe Contreras21fcb342013-08-01 18:43:59 -0500958 * Arg:
959 * device : video output device (VGA)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960 *
961 * Return Value:
Felipe Contreras21fcb342013-08-01 18:43:59 -0500962 * None
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963 *
Julius Volz98fb8fe2007-02-20 16:38:40 +0100964 * Find out all required AML methods defined under the video bus device.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965 */
966
Len Brown4be44fc2005-08-05 00:44:28 -0400967static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968{
Jiang Liu952c63e2013-06-29 00:24:38 +0800969 if (acpi_has_method(video->device->handle, "_DOS"))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700970 video->cap._DOS = 1;
Jiang Liu952c63e2013-06-29 00:24:38 +0800971 if (acpi_has_method(video->device->handle, "_DOD"))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972 video->cap._DOD = 1;
Jiang Liu952c63e2013-06-29 00:24:38 +0800973 if (acpi_has_method(video->device->handle, "_ROM"))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974 video->cap._ROM = 1;
Jiang Liu952c63e2013-06-29 00:24:38 +0800975 if (acpi_has_method(video->device->handle, "_GPD"))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976 video->cap._GPD = 1;
Jiang Liu952c63e2013-06-29 00:24:38 +0800977 if (acpi_has_method(video->device->handle, "_SPD"))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978 video->cap._SPD = 1;
Jiang Liu952c63e2013-06-29 00:24:38 +0800979 if (acpi_has_method(video->device->handle, "_VPO"))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980 video->cap._VPO = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700981}
982
983/*
984 * Check whether the video bus device has required AML method to
985 * support the desired features
986 */
987
Len Brown4be44fc2005-08-05 00:44:28 -0400988static int acpi_video_bus_check(struct acpi_video_bus *video)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989{
Len Brown4be44fc2005-08-05 00:44:28 -0400990 acpi_status status = -ENOENT;
Alexander Chiang1e4cffe2009-06-10 19:56:00 +0000991 struct pci_dev *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992
993 if (!video)
Patrick Mocheld550d982006-06-27 00:41:40 -0400994 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995
Alexander Chiang1e4cffe2009-06-10 19:56:00 +0000996 dev = acpi_get_pci_dev(video->device->handle);
Thomas Renninger22c13f92008-08-01 17:37:54 +0200997 if (!dev)
998 return -ENODEV;
Alexander Chiang1e4cffe2009-06-10 19:56:00 +0000999 pci_dev_put(dev);
Thomas Renninger22c13f92008-08-01 17:37:54 +02001000
Felipe Contreras21fcb342013-08-01 18:43:59 -05001001 /*
1002 * Since there is no HID, CID and so on for VGA driver, we have
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003 * to check well known required nodes.
1004 */
1005
Julius Volz98fb8fe2007-02-20 16:38:40 +01001006 /* Does this device support video switching? */
Stefan Bader3a1151e2009-08-21 11:03:05 +02001007 if (video->cap._DOS || video->cap._DOD) {
1008 if (!video->cap._DOS) {
1009 printk(KERN_WARNING FW_BUG
1010 "ACPI(%s) defines _DOD but not _DOS\n",
1011 acpi_device_bid(video->device));
1012 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013 video->flags.multihead = 1;
1014 status = 0;
1015 }
1016
Julius Volz98fb8fe2007-02-20 16:38:40 +01001017 /* Does this device support retrieving a video ROM? */
Len Brown4be44fc2005-08-05 00:44:28 -04001018 if (video->cap._ROM) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019 video->flags.rom = 1;
1020 status = 0;
1021 }
1022
Julius Volz98fb8fe2007-02-20 16:38:40 +01001023 /* Does this device support configuring which video device to POST? */
Len Brown4be44fc2005-08-05 00:44:28 -04001024 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025 video->flags.post = 1;
1026 status = 0;
1027 }
1028
Patrick Mocheld550d982006-06-27 00:41:40 -04001029 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030}
1031
Felipe Contreras21fcb342013-08-01 18:43:59 -05001032/*
1033 * --------------------------------------------------------------------------
1034 * Driver Interface
1035 * --------------------------------------------------------------------------
1036 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001037
1038/* device interface */
Felipe Contreras915ea7e2013-08-03 22:12:50 +02001039static struct acpi_video_device_attrib *
Rui Zhang82cae992007-01-03 23:40:53 -05001040acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1041{
Dmitry Torokhov78eed022007-11-05 11:43:33 -05001042 struct acpi_video_enumerated_device *ids;
1043 int i;
Rui Zhang82cae992007-01-03 23:40:53 -05001044
Dmitry Torokhov78eed022007-11-05 11:43:33 -05001045 for (i = 0; i < video->attached_count; i++) {
1046 ids = &video->attached_array[i];
1047 if ((ids->value.int_val & 0xffff) == device_id)
1048 return &ids->value.attrib;
1049 }
1050
Rui Zhang82cae992007-01-03 23:40:53 -05001051 return NULL;
1052}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053
1054static int
Matthew Garrette92a7162010-01-12 14:17:03 -05001055acpi_video_get_device_type(struct acpi_video_bus *video,
1056 unsigned long device_id)
1057{
1058 struct acpi_video_enumerated_device *ids;
1059 int i;
1060
1061 for (i = 0; i < video->attached_count; i++) {
1062 ids = &video->attached_array[i];
1063 if ((ids->value.int_val & 0xffff) == device_id)
1064 return ids->value.int_val;
1065 }
1066
1067 return 0;
1068}
1069
1070static int
Len Brown4be44fc2005-08-05 00:44:28 -04001071acpi_video_bus_get_one_device(struct acpi_device *device,
1072 struct acpi_video_bus *video)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073{
Matthew Wilcox27663c52008-10-10 02:22:59 -04001074 unsigned long long device_id;
Matthew Garrette92a7162010-01-12 14:17:03 -05001075 int status, device_type;
Len Brown4be44fc2005-08-05 00:44:28 -04001076 struct acpi_video_device *data;
Felipe Contreras915ea7e2013-08-03 22:12:50 +02001077 struct acpi_video_device_attrib *attribute;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001078
Len Brown4be44fc2005-08-05 00:44:28 -04001079 status =
1080 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
Aaron Lu91e13aa2013-04-25 02:47:49 +00001081 /* Some device omits _ADR, we skip them instead of fail */
1082 if (ACPI_FAILURE(status))
1083 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001084
Aaron Lu91e13aa2013-04-25 02:47:49 +00001085 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1086 if (!data)
1087 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088
Aaron Lu91e13aa2013-04-25 02:47:49 +00001089 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1090 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1091 device->driver_data = data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001092
Aaron Lu91e13aa2013-04-25 02:47:49 +00001093 data->device_id = device_id;
1094 data->video = video;
1095 data->dev = device;
Linus Torvalds8ab58e82014-07-18 14:32:51 +02001096 INIT_DELAYED_WORK(&data->switch_brightness_work,
1097 acpi_video_switch_brightness);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001098
Aaron Lu91e13aa2013-04-25 02:47:49 +00001099 attribute = acpi_video_get_device_attr(video, device_id);
Rui Zhang82cae992007-01-03 23:40:53 -05001100
Aaron Lue50b9be2015-10-28 15:09:23 +08001101 if (attribute && (attribute->device_id_scheme || device_id_scheme)) {
Aaron Lu91e13aa2013-04-25 02:47:49 +00001102 switch (attribute->display_type) {
1103 case ACPI_VIDEO_DISPLAY_CRT:
1104 data->flags.crt = 1;
1105 break;
1106 case ACPI_VIDEO_DISPLAY_TV:
1107 data->flags.tvout = 1;
1108 break;
1109 case ACPI_VIDEO_DISPLAY_DVI:
1110 data->flags.dvi = 1;
1111 break;
1112 case ACPI_VIDEO_DISPLAY_LCD:
1113 data->flags.lcd = 1;
1114 break;
1115 default:
1116 data->flags.unknown = 1;
1117 break;
1118 }
Felipe Contreras915ea7e2013-08-03 22:12:50 +02001119 if (attribute->bios_can_detect)
Aaron Lu91e13aa2013-04-25 02:47:49 +00001120 data->flags.bios = 1;
1121 } else {
1122 /* Check for legacy IDs */
1123 device_type = acpi_video_get_device_type(video, device_id);
1124 /* Ignore bits 16 and 18-20 */
1125 switch (device_type & 0xffe2ffff) {
Felipe Contreras915ea7e2013-08-03 22:12:50 +02001126 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1127 data->flags.crt = 1;
1128 break;
1129 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1130 data->flags.lcd = 1;
1131 break;
1132 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1133 data->flags.tvout = 1;
1134 break;
1135 default:
1136 data->flags.unknown = 1;
Matthew Garrette92a7162010-01-12 14:17:03 -05001137 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001138 }
1139
Aaron Lu91e13aa2013-04-25 02:47:49 +00001140 acpi_video_device_bind(video, data);
1141 acpi_video_device_find_cap(data);
1142
Aaron Lu91e13aa2013-04-25 02:47:49 +00001143 mutex_lock(&video->device_list_lock);
1144 list_add_tail(&data->entry, &video->video_device_list);
1145 mutex_unlock(&video->device_list_lock);
1146
1147 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148}
1149
1150/*
1151 * Arg:
Felipe Contreras21fcb342013-08-01 18:43:59 -05001152 * video : video bus device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001153 *
1154 * Return:
Felipe Contreras21fcb342013-08-01 18:43:59 -05001155 * none
1156 *
1157 * Enumerate the video device list of the video bus,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158 * bind the ids with the corresponding video devices
1159 * under the video bus.
Len Brown4be44fc2005-08-05 00:44:28 -04001160 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161
Len Brown4be44fc2005-08-05 00:44:28 -04001162static void acpi_video_device_rebind(struct acpi_video_bus *video)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001163{
Dmitry Torokhovff102ea2007-11-05 11:43:31 -05001164 struct acpi_video_device *dev;
1165
Dmitry Torokhovbbac81f2007-11-05 11:43:32 -05001166 mutex_lock(&video->device_list_lock);
Dmitry Torokhovff102ea2007-11-05 11:43:31 -05001167
1168 list_for_each_entry(dev, &video->video_device_list, entry)
Len Brown4be44fc2005-08-05 00:44:28 -04001169 acpi_video_device_bind(video, dev);
Dmitry Torokhovff102ea2007-11-05 11:43:31 -05001170
Dmitry Torokhovbbac81f2007-11-05 11:43:32 -05001171 mutex_unlock(&video->device_list_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001172}
1173
1174/*
1175 * Arg:
Felipe Contreras21fcb342013-08-01 18:43:59 -05001176 * video : video bus device
1177 * device : video output device under the video
1178 * bus
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179 *
1180 * Return:
Felipe Contreras21fcb342013-08-01 18:43:59 -05001181 * none
1182 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183 * Bind the ids with the corresponding video devices
1184 * under the video bus.
Len Brown4be44fc2005-08-05 00:44:28 -04001185 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186
1187static void
Len Brown4be44fc2005-08-05 00:44:28 -04001188acpi_video_device_bind(struct acpi_video_bus *video,
1189 struct acpi_video_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190{
Dmitry Torokhov78eed022007-11-05 11:43:33 -05001191 struct acpi_video_enumerated_device *ids;
Len Brown4be44fc2005-08-05 00:44:28 -04001192 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001193
Dmitry Torokhov78eed022007-11-05 11:43:33 -05001194 for (i = 0; i < video->attached_count; i++) {
1195 ids = &video->attached_array[i];
1196 if (device->device_id == (ids->value.int_val & 0xffff)) {
1197 ids->bind_info = device;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1199 }
1200 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001201}
1202
Aaron Lu0b8db272014-09-30 14:10:17 +08001203static bool acpi_video_device_in_dod(struct acpi_video_device *device)
1204{
1205 struct acpi_video_bus *video = device->video;
1206 int i;
1207
Aaron Lub4df4632014-12-15 16:01:29 +08001208 /*
1209 * If we have a broken _DOD or we have more than 8 output devices
1210 * under the graphics controller node that we can't proper deal with
1211 * in the operation region code currently, no need to test.
1212 */
1213 if (!video->attached_count || video->child_count > 8)
Aaron Lu0b8db272014-09-30 14:10:17 +08001214 return true;
1215
1216 for (i = 0; i < video->attached_count; i++) {
Aaron Lu35d05652014-12-01 02:09:18 +01001217 if ((video->attached_array[i].value.int_val & 0xfff) ==
1218 (device->device_id & 0xfff))
Aaron Lu0b8db272014-09-30 14:10:17 +08001219 return true;
1220 }
1221
1222 return false;
1223}
1224
Linus Torvalds1da177e2005-04-16 15:20:36 -07001225/*
1226 * Arg:
Felipe Contreras21fcb342013-08-01 18:43:59 -05001227 * video : video bus device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228 *
1229 * Return:
Felipe Contreras21fcb342013-08-01 18:43:59 -05001230 * < 0 : error
1231 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001232 * Call _DOD to enumerate all devices attached to display adapter
1233 *
Len Brown4be44fc2005-08-05 00:44:28 -04001234 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235
1236static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1237{
Len Brown4be44fc2005-08-05 00:44:28 -04001238 int status;
1239 int count;
1240 int i;
Dmitry Torokhov78eed022007-11-05 11:43:33 -05001241 struct acpi_video_enumerated_device *active_list;
Len Brown4be44fc2005-08-05 00:44:28 -04001242 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1243 union acpi_object *dod = NULL;
1244 union acpi_object *obj;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001245
Patrick Mochel90130262006-05-19 16:54:48 -04001246 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001247 if (!ACPI_SUCCESS(status)) {
Thomas Renningera6fc6722006-06-26 23:58:43 -04001248 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
Patrick Mocheld550d982006-06-27 00:41:40 -04001249 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001250 }
1251
Jan Engelhardt50dd0962006-10-01 00:28:50 +02001252 dod = buffer.pointer;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
Thomas Renningera6fc6722006-06-26 23:58:43 -04001254 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001255 status = -EFAULT;
1256 goto out;
1257 }
1258
1259 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
Len Brown4be44fc2005-08-05 00:44:28 -04001260 dod->package.count));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001261
Dmitry Torokhov78eed022007-11-05 11:43:33 -05001262 active_list = kcalloc(1 + dod->package.count,
1263 sizeof(struct acpi_video_enumerated_device),
1264 GFP_KERNEL);
1265 if (!active_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001266 status = -ENOMEM;
1267 goto out;
1268 }
1269
1270 count = 0;
1271 for (i = 0; i < dod->package.count; i++) {
Jan Engelhardt50dd0962006-10-01 00:28:50 +02001272 obj = &dod->package.elements[i];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001273
1274 if (obj->type != ACPI_TYPE_INTEGER) {
Dmitry Torokhov78eed022007-11-05 11:43:33 -05001275 printk(KERN_ERR PREFIX
1276 "Invalid _DOD data in element %d\n", i);
1277 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001278 }
Dmitry Torokhov78eed022007-11-05 11:43:33 -05001279
1280 active_list[count].value.int_val = obj->integer.value;
1281 active_list[count].bind_info = NULL;
Len Brown4be44fc2005-08-05 00:44:28 -04001282 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1283 (int)obj->integer.value));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001284 count++;
1285 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286
Jesper Juhl6044ec82005-11-07 01:01:32 -08001287 kfree(video->attached_array);
Len Brown4be44fc2005-08-05 00:44:28 -04001288
Dmitry Torokhov78eed022007-11-05 11:43:33 -05001289 video->attached_array = active_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001290 video->attached_count = count;
Dmitry Torokhov78eed022007-11-05 11:43:33 -05001291
Felipe Contreras915ea7e2013-08-03 22:12:50 +02001292out:
Len Brown02438d82006-06-30 03:19:10 -04001293 kfree(buffer.pointer);
Patrick Mocheld550d982006-06-27 00:41:40 -04001294 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001295}
1296
Len Brown4be44fc2005-08-05 00:44:28 -04001297static int
1298acpi_video_get_next_level(struct acpi_video_device *device,
1299 u32 level_current, u32 event)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001300{
Alexey Starikovskiy63f0edf2007-09-03 16:30:08 +04001301 int min, max, min_above, max_below, i, l, delta = 255;
Thomas Tuttlef4715182006-12-19 12:56:14 -08001302 max = max_below = 0;
1303 min = min_above = 255;
Alexey Starikovskiy63f0edf2007-09-03 16:30:08 +04001304 /* Find closest level to level_current */
Zhao Yakui0a3db1c2009-02-02 11:33:41 +08001305 for (i = 2; i < device->brightness->count; i++) {
Alexey Starikovskiy63f0edf2007-09-03 16:30:08 +04001306 l = device->brightness->levels[i];
1307 if (abs(l - level_current) < abs(delta)) {
1308 delta = l - level_current;
1309 if (!delta)
1310 break;
1311 }
1312 }
1313 /* Ajust level_current to closest available level */
1314 level_current += delta;
Zhao Yakui0a3db1c2009-02-02 11:33:41 +08001315 for (i = 2; i < device->brightness->count; i++) {
Thomas Tuttlef4715182006-12-19 12:56:14 -08001316 l = device->brightness->levels[i];
1317 if (l < min)
1318 min = l;
1319 if (l > max)
1320 max = l;
1321 if (l < min_above && l > level_current)
1322 min_above = l;
1323 if (l > max_below && l < level_current)
1324 max_below = l;
1325 }
1326
1327 switch (event) {
1328 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1329 return (level_current < max) ? min_above : min;
1330 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1331 return (level_current < max) ? min_above : max;
1332 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1333 return (level_current > min) ? max_below : min;
1334 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1335 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1336 return 0;
1337 default:
1338 return level_current;
1339 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001340}
1341
Linus Torvalds8ab58e82014-07-18 14:32:51 +02001342static void
1343acpi_video_switch_brightness(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001344{
Linus Torvalds8ab58e82014-07-18 14:32:51 +02001345 struct acpi_video_device *device = container_of(to_delayed_work(work),
1346 struct acpi_video_device, switch_brightness_work);
Matthew Wilcox27663c52008-10-10 02:22:59 -04001347 unsigned long long level_current, level_next;
Linus Torvalds8ab58e82014-07-18 14:32:51 +02001348 int event = device->switch_brightness_event;
Zhang Ruic8890f92009-03-18 16:27:08 +08001349 int result = -EINVAL;
1350
Aaron Lufbc9fe12013-10-11 21:27:45 +08001351 /* no warning message if acpi_backlight=vendor or a quirk is used */
Hans de Goede654a1822015-06-09 10:32:25 +02001352 if (!device->backlight)
Linus Torvalds8ab58e82014-07-18 14:32:51 +02001353 return;
Zhang Rui28c32e92009-07-13 10:33:24 +08001354
Julia Jomantaite469778c2008-06-23 22:50:42 +01001355 if (!device->brightness)
Zhang Ruic8890f92009-03-18 16:27:08 +08001356 goto out;
1357
1358 result = acpi_video_device_lcd_get_level_current(device,
Danny Baumanna89803d2013-03-19 16:22:50 +00001359 &level_current,
1360 false);
Zhang Ruic8890f92009-03-18 16:27:08 +08001361 if (result)
1362 goto out;
1363
Linus Torvalds1da177e2005-04-16 15:20:36 -07001364 level_next = acpi_video_get_next_level(device, level_current, event);
Zhang Ruic8890f92009-03-18 16:27:08 +08001365
Zhang Rui24450c72009-03-18 16:27:10 +08001366 result = acpi_video_device_lcd_set_level(device, level_next);
Zhang Ruic8890f92009-03-18 16:27:08 +08001367
Matthew Garrett36342742009-07-14 17:06:03 +01001368 if (!result)
1369 backlight_force_update(device->backlight,
1370 BACKLIGHT_UPDATE_HOTKEY);
1371
Zhang Ruic8890f92009-03-18 16:27:08 +08001372out:
1373 if (result)
1374 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001375}
1376
Matthew Garrette92a7162010-01-12 14:17:03 -05001377int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1378 void **edid)
1379{
1380 struct acpi_video_bus *video;
1381 struct acpi_video_device *video_device;
1382 union acpi_object *buffer = NULL;
1383 acpi_status status;
1384 int i, length;
1385
1386 if (!device || !acpi_driver_data(device))
1387 return -EINVAL;
1388
1389 video = acpi_driver_data(device);
1390
1391 for (i = 0; i < video->attached_count; i++) {
1392 video_device = video->attached_array[i].bind_info;
1393 length = 256;
1394
1395 if (!video_device)
1396 continue;
1397
Zhang Rui82069552010-12-06 15:04:24 +08001398 if (!video_device->cap._DDC)
1399 continue;
1400
Matthew Garrette92a7162010-01-12 14:17:03 -05001401 if (type) {
1402 switch (type) {
1403 case ACPI_VIDEO_DISPLAY_CRT:
1404 if (!video_device->flags.crt)
1405 continue;
1406 break;
1407 case ACPI_VIDEO_DISPLAY_TV:
1408 if (!video_device->flags.tvout)
1409 continue;
1410 break;
1411 case ACPI_VIDEO_DISPLAY_DVI:
1412 if (!video_device->flags.dvi)
1413 continue;
1414 break;
1415 case ACPI_VIDEO_DISPLAY_LCD:
1416 if (!video_device->flags.lcd)
1417 continue;
1418 break;
1419 }
1420 } else if (video_device->device_id != device_id) {
1421 continue;
1422 }
1423
1424 status = acpi_video_device_EDID(video_device, &buffer, length);
1425
1426 if (ACPI_FAILURE(status) || !buffer ||
1427 buffer->type != ACPI_TYPE_BUFFER) {
1428 length = 128;
1429 status = acpi_video_device_EDID(video_device, &buffer,
1430 length);
1431 if (ACPI_FAILURE(status) || !buffer ||
1432 buffer->type != ACPI_TYPE_BUFFER) {
1433 continue;
1434 }
1435 }
1436
1437 *edid = buffer->buffer.pointer;
1438 return length;
1439 }
1440
1441 return -ENODEV;
1442}
1443EXPORT_SYMBOL(acpi_video_get_edid);
1444
Linus Torvalds1da177e2005-04-16 15:20:36 -07001445static int
Len Brown4be44fc2005-08-05 00:44:28 -04001446acpi_video_bus_get_devices(struct acpi_video_bus *video,
1447 struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001448{
Igor Murzovfba4e082012-10-13 04:41:25 +04001449 int status = 0;
Dmitry Torokhovff102ea2007-11-05 11:43:31 -05001450 struct acpi_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001451
Igor Murzovfba4e082012-10-13 04:41:25 +04001452 /*
1453 * There are systems where video module known to work fine regardless
1454 * of broken _DOD and ignoring returned value here doesn't cause
1455 * any issues later.
1456 */
1457 acpi_video_device_enumerate(video);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001458
Dmitry Torokhovff102ea2007-11-05 11:43:31 -05001459 list_for_each_entry(dev, &device->children, node) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001460
1461 status = acpi_video_bus_get_one_device(dev, video);
Igor Murzovea9f8852012-03-30 21:32:08 +04001462 if (status) {
Aaron Lu91e13aa2013-04-25 02:47:49 +00001463 dev_err(&dev->dev, "Can't attach device\n");
1464 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001465 }
Aaron Lub4df4632014-12-15 16:01:29 +08001466 video->child_count++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001467 }
Patrick Mocheld550d982006-06-27 00:41:40 -04001468 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001469}
1470
Linus Torvalds1da177e2005-04-16 15:20:36 -07001471/* acpi_video interface */
1472
Aaron Luefaa14c2013-07-16 13:08:05 +08001473/*
1474 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1475 * preform any automatic brightness change on receiving a notification.
1476 */
Len Brown4be44fc2005-08-05 00:44:28 -04001477static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001478{
Aaron Luefaa14c2013-07-16 13:08:05 +08001479 return acpi_video_bus_DOS(video, 0,
Aaron Lufbc9fe12013-10-11 21:27:45 +08001480 acpi_osi_is_win8() ? 1 : 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001481}
1482
Len Brown4be44fc2005-08-05 00:44:28 -04001483static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001484{
Aaron Luefaa14c2013-07-16 13:08:05 +08001485 return acpi_video_bus_DOS(video, 0,
Aaron Lufbc9fe12013-10-11 21:27:45 +08001486 acpi_osi_is_win8() ? 0 : 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487}
1488
Bjorn Helgaas70155582009-04-07 15:37:11 +00001489static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001490{
Bjorn Helgaas70155582009-04-07 15:37:11 +00001491 struct acpi_video_bus *video = acpi_driver_data(device);
Luming Yue9dab192007-08-20 18:23:53 +08001492 struct input_dev *input;
Matthew Garrett17c452f2009-12-11 17:40:46 -05001493 int keycode = 0;
Luming Yue9dab192007-08-20 18:23:53 +08001494
Aaron Lu67b662e2013-10-11 21:27:44 +08001495 if (!video || !video->input)
Patrick Mocheld550d982006-06-27 00:41:40 -04001496 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001497
Luming Yue9dab192007-08-20 18:23:53 +08001498 input = video->input;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001499
1500 switch (event) {
Julius Volz98fb8fe2007-02-20 16:38:40 +01001501 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001502 * most likely via hotkey. */
Luca Tettamanti8a37c652012-08-02 15:30:27 +02001503 keycode = KEY_SWITCHVIDEOMODE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001504 break;
1505
Julius Volz98fb8fe2007-02-20 16:38:40 +01001506 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
Linus Torvalds1da177e2005-04-16 15:20:36 -07001507 * connector. */
1508 acpi_video_device_enumerate(video);
1509 acpi_video_device_rebind(video);
Luming Yue9dab192007-08-20 18:23:53 +08001510 keycode = KEY_SWITCHVIDEOMODE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001511 break;
1512
Len Brown4be44fc2005-08-05 00:44:28 -04001513 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
Luming Yue9dab192007-08-20 18:23:53 +08001514 keycode = KEY_SWITCHVIDEOMODE;
1515 break;
Len Brown4be44fc2005-08-05 00:44:28 -04001516 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
Luming Yue9dab192007-08-20 18:23:53 +08001517 keycode = KEY_VIDEO_NEXT;
1518 break;
Len Brown4be44fc2005-08-05 00:44:28 -04001519 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
Luming Yue9dab192007-08-20 18:23:53 +08001520 keycode = KEY_VIDEO_PREV;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001521 break;
1522
1523 default:
1524 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -04001525 "Unsupported event [0x%x]\n", event));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001526 break;
1527 }
1528
Luca Tettamanti8a37c652012-08-02 15:30:27 +02001529 if (acpi_notifier_call_chain(device, event, 0))
1530 /* Something vetoed the keypress. */
1531 keycode = 0;
Matthew Garrett17c452f2009-12-11 17:40:46 -05001532
Hans de Goede05bc59a2015-12-22 19:09:51 +01001533 if (keycode && (report_key_events & REPORT_OUTPUT_KEY_EVENTS)) {
Matthew Garrett17c452f2009-12-11 17:40:46 -05001534 input_report_key(input, keycode, 1);
1535 input_sync(input);
1536 input_report_key(input, keycode, 0);
1537 input_sync(input);
1538 }
Luming Yue9dab192007-08-20 18:23:53 +08001539
Patrick Mocheld550d982006-06-27 00:41:40 -04001540 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001541}
1542
Linus Torvalds8ab58e82014-07-18 14:32:51 +02001543static void brightness_switch_event(struct acpi_video_device *video_device,
1544 u32 event)
1545{
1546 if (!brightness_switch_enabled)
1547 return;
1548
1549 video_device->switch_brightness_event = event;
1550 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10);
1551}
1552
Len Brown4be44fc2005-08-05 00:44:28 -04001553static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001554{
Jan Engelhardt50dd0962006-10-01 00:28:50 +02001555 struct acpi_video_device *video_device = data;
Len Brown4be44fc2005-08-05 00:44:28 -04001556 struct acpi_device *device = NULL;
Luming Yue9dab192007-08-20 18:23:53 +08001557 struct acpi_video_bus *bus;
1558 struct input_dev *input;
Matthew Garrett17c452f2009-12-11 17:40:46 -05001559 int keycode = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001560
Linus Torvalds1da177e2005-04-16 15:20:36 -07001561 if (!video_device)
Patrick Mocheld550d982006-06-27 00:41:40 -04001562 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001563
Patrick Mochele6afa0d2006-05-19 16:54:40 -04001564 device = video_device->dev;
Luming Yue9dab192007-08-20 18:23:53 +08001565 bus = video_device->video;
1566 input = bus->input;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001567
1568 switch (event) {
Len Brown4be44fc2005-08-05 00:44:28 -04001569 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
Linus Torvalds8ab58e82014-07-18 14:32:51 +02001570 brightness_switch_event(video_device, event);
Luming Yue9dab192007-08-20 18:23:53 +08001571 keycode = KEY_BRIGHTNESS_CYCLE;
1572 break;
Len Brown4be44fc2005-08-05 00:44:28 -04001573 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
Linus Torvalds8ab58e82014-07-18 14:32:51 +02001574 brightness_switch_event(video_device, event);
Luming Yue9dab192007-08-20 18:23:53 +08001575 keycode = KEY_BRIGHTNESSUP;
1576 break;
Len Brown4be44fc2005-08-05 00:44:28 -04001577 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
Linus Torvalds8ab58e82014-07-18 14:32:51 +02001578 brightness_switch_event(video_device, event);
Luming Yue9dab192007-08-20 18:23:53 +08001579 keycode = KEY_BRIGHTNESSDOWN;
1580 break;
Justin P. Mattock70f23fd2011-05-10 10:16:21 +02001581 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
Linus Torvalds8ab58e82014-07-18 14:32:51 +02001582 brightness_switch_event(video_device, event);
Luming Yue9dab192007-08-20 18:23:53 +08001583 keycode = KEY_BRIGHTNESS_ZERO;
1584 break;
Len Brown4be44fc2005-08-05 00:44:28 -04001585 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
Linus Torvalds8ab58e82014-07-18 14:32:51 +02001586 brightness_switch_event(video_device, event);
Luming Yue9dab192007-08-20 18:23:53 +08001587 keycode = KEY_DISPLAY_OFF;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001588 break;
1589 default:
1590 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -04001591 "Unsupported event [0x%x]\n", event));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001592 break;
1593 }
Luming Yue9dab192007-08-20 18:23:53 +08001594
Zhang Rui7761f632008-01-25 14:48:12 +08001595 acpi_notifier_call_chain(device, event, 0);
Matthew Garrett17c452f2009-12-11 17:40:46 -05001596
Hans de Goede05bc59a2015-12-22 19:09:51 +01001597 if (keycode && (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS)) {
Matthew Garrett17c452f2009-12-11 17:40:46 -05001598 input_report_key(input, keycode, 1);
1599 input_sync(input);
1600 input_report_key(input, keycode, 0);
1601 input_sync(input);
1602 }
Luming Yue9dab192007-08-20 18:23:53 +08001603
Patrick Mocheld550d982006-06-27 00:41:40 -04001604 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001605}
1606
Rafael J. Wysockiac7729d2010-04-05 01:43:51 +02001607static int acpi_video_resume(struct notifier_block *nb,
1608 unsigned long val, void *ign)
Matthew Garrett863c1492008-02-04 23:31:24 -08001609{
1610 struct acpi_video_bus *video;
1611 struct acpi_video_device *video_device;
1612 int i;
1613
Rafael J. Wysockiac7729d2010-04-05 01:43:51 +02001614 switch (val) {
1615 case PM_HIBERNATION_PREPARE:
1616 case PM_SUSPEND_PREPARE:
1617 case PM_RESTORE_PREPARE:
1618 return NOTIFY_DONE;
1619 }
Matthew Garrett863c1492008-02-04 23:31:24 -08001620
Rafael J. Wysockiac7729d2010-04-05 01:43:51 +02001621 video = container_of(nb, struct acpi_video_bus, pm_nb);
1622
1623 dev_info(&video->device->dev, "Restoring backlight state\n");
Matthew Garrett863c1492008-02-04 23:31:24 -08001624
1625 for (i = 0; i < video->attached_count; i++) {
1626 video_device = video->attached_array[i].bind_info;
Hans de Goede654a1822015-06-09 10:32:25 +02001627 if (video_device && video_device->brightness)
1628 acpi_video_device_lcd_set_level(video_device,
1629 video_device->brightness->curr);
Matthew Garrett863c1492008-02-04 23:31:24 -08001630 }
Rafael J. Wysockiac7729d2010-04-05 01:43:51 +02001631
1632 return NOTIFY_OK;
Matthew Garrett863c1492008-02-04 23:31:24 -08001633}
1634
Zhang Ruic504f8c2009-12-30 15:59:23 +08001635static acpi_status
1636acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1637 void **return_value)
1638{
1639 struct acpi_device *device = context;
1640 struct acpi_device *sibling;
1641 int result;
1642
1643 if (handle == device->handle)
1644 return AE_CTRL_TERMINATE;
1645
1646 result = acpi_bus_get_device(handle, &sibling);
1647 if (result)
1648 return AE_OK;
1649
1650 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1651 return AE_ALREADY_EXISTS;
1652
1653 return AE_OK;
1654}
1655
Aaron Lu67b662e2013-10-11 21:27:44 +08001656static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1657{
Hans de Goede99678ed2014-05-15 13:22:33 +02001658 struct backlight_properties props;
1659 struct pci_dev *pdev;
1660 acpi_handle acpi_parent;
1661 struct device *parent = NULL;
1662 int result;
1663 static int count;
1664 char *name;
Aaron Lu67b662e2013-10-11 21:27:44 +08001665
Hans de Goede99678ed2014-05-15 13:22:33 +02001666 result = acpi_video_init_brightness(device);
1667 if (result)
1668 return;
Hans de Goede654a1822015-06-09 10:32:25 +02001669
1670 if (disable_backlight_sysfs_if > 0)
1671 return;
1672
Hans de Goede99678ed2014-05-15 13:22:33 +02001673 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1674 if (!name)
1675 return;
1676 count++;
Aaron Lu67b662e2013-10-11 21:27:44 +08001677
Hans de Goede99678ed2014-05-15 13:22:33 +02001678 acpi_get_parent(device->dev->handle, &acpi_parent);
Aaron Lu67b662e2013-10-11 21:27:44 +08001679
Hans de Goede99678ed2014-05-15 13:22:33 +02001680 pdev = acpi_get_pci_dev(acpi_parent);
1681 if (pdev) {
1682 parent = &pdev->dev;
1683 pci_dev_put(pdev);
Aaron Lu67b662e2013-10-11 21:27:44 +08001684 }
Hans de Goede99678ed2014-05-15 13:22:33 +02001685
1686 memset(&props, 0, sizeof(struct backlight_properties));
1687 props.type = BACKLIGHT_FIRMWARE;
1688 props.max_brightness = device->brightness->count - 3;
1689 device->backlight = backlight_device_register(name,
1690 parent,
1691 device,
1692 &acpi_backlight_ops,
1693 &props);
1694 kfree(name);
Hans de Goede654a1822015-06-09 10:32:25 +02001695 if (IS_ERR(device->backlight)) {
1696 device->backlight = NULL;
Hans de Goede99678ed2014-05-15 13:22:33 +02001697 return;
Hans de Goede654a1822015-06-09 10:32:25 +02001698 }
Hans de Goede99678ed2014-05-15 13:22:33 +02001699
1700 /*
1701 * Save current brightness level in case we have to restore it
1702 * before acpi_video_device_lcd_set_level() is called next time.
1703 */
1704 device->backlight->props.brightness =
1705 acpi_video_get_brightness(device->backlight);
1706
1707 device->cooling_dev = thermal_cooling_device_register("LCD",
1708 device->dev, &video_cooling_ops);
1709 if (IS_ERR(device->cooling_dev)) {
1710 /*
1711 * Set cooling_dev to NULL so we don't crash trying to free it.
1712 * Also, why the hell we are returning early and not attempt to
1713 * register video output if cooling device registration failed?
1714 * -- dtor
1715 */
1716 device->cooling_dev = NULL;
1717 return;
1718 }
1719
1720 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1721 device->cooling_dev->id);
1722 result = sysfs_create_link(&device->dev->dev.kobj,
1723 &device->cooling_dev->device.kobj,
1724 "thermal_cooling");
1725 if (result)
1726 printk(KERN_ERR PREFIX "Create sysfs link\n");
1727 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1728 &device->dev->dev.kobj, "device");
1729 if (result)
1730 printk(KERN_ERR PREFIX "Create sysfs link\n");
Aaron Lu67b662e2013-10-11 21:27:44 +08001731}
1732
Aaron Ludce4ec22014-10-28 14:35:59 +08001733static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video)
1734{
1735 struct acpi_video_device *dev;
1736 union acpi_object *levels;
1737
1738 mutex_lock(&video->device_list_lock);
1739 list_for_each_entry(dev, &video->video_device_list, entry) {
1740 if (!acpi_video_device_lcd_query_levels(dev, &levels))
1741 kfree(levels);
1742 }
1743 mutex_unlock(&video->device_list_lock);
1744}
1745
Aaron Lue50b9be2015-10-28 15:09:23 +08001746static bool acpi_video_should_register_backlight(struct acpi_video_device *dev)
1747{
1748 /*
1749 * Do not create backlight device for video output
1750 * device that is not in the enumerated list.
1751 */
1752 if (!acpi_video_device_in_dod(dev)) {
1753 dev_dbg(&dev->dev->dev, "not in _DOD list, ignore\n");
1754 return false;
1755 }
1756
1757 if (only_lcd)
1758 return dev->flags.lcd;
1759 return true;
1760}
1761
Aaron Lu67b662e2013-10-11 21:27:44 +08001762static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1763{
1764 struct acpi_video_device *dev;
1765
Hans de Goede53a92ba2014-05-21 15:39:55 +02001766 if (video->backlight_registered)
1767 return 0;
1768
Aaron Ludce4ec22014-10-28 14:35:59 +08001769 acpi_video_run_bcl_for_osi(video);
1770
Hans de Goede3bd6bce2015-06-16 16:27:51 +02001771 if (acpi_video_get_backlight_type() != acpi_backlight_video)
Hans de Goede99678ed2014-05-15 13:22:33 +02001772 return 0;
1773
Aaron Lu67b662e2013-10-11 21:27:44 +08001774 mutex_lock(&video->device_list_lock);
Aaron Lue50b9be2015-10-28 15:09:23 +08001775 list_for_each_entry(dev, &video->video_device_list, entry) {
1776 if (acpi_video_should_register_backlight(dev))
1777 acpi_video_dev_register_backlight(dev);
1778 }
Aaron Lu67b662e2013-10-11 21:27:44 +08001779 mutex_unlock(&video->device_list_lock);
1780
Hans de Goede99678ed2014-05-15 13:22:33 +02001781 video->backlight_registered = true;
1782
Aaron Lu67b662e2013-10-11 21:27:44 +08001783 video->pm_nb.notifier_call = acpi_video_resume;
1784 video->pm_nb.priority = 0;
1785 return register_pm_notifier(&video->pm_nb);
1786}
1787
1788static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1789{
1790 if (device->backlight) {
1791 backlight_device_unregister(device->backlight);
1792 device->backlight = NULL;
1793 }
1794 if (device->brightness) {
1795 kfree(device->brightness->levels);
1796 kfree(device->brightness);
1797 device->brightness = NULL;
1798 }
1799 if (device->cooling_dev) {
1800 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1801 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1802 thermal_cooling_device_unregister(device->cooling_dev);
1803 device->cooling_dev = NULL;
1804 }
1805}
1806
1807static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1808{
1809 struct acpi_video_device *dev;
Hans de Goede99678ed2014-05-15 13:22:33 +02001810 int error;
1811
1812 if (!video->backlight_registered)
1813 return 0;
1814
1815 error = unregister_pm_notifier(&video->pm_nb);
Aaron Lu67b662e2013-10-11 21:27:44 +08001816
1817 mutex_lock(&video->device_list_lock);
1818 list_for_each_entry(dev, &video->video_device_list, entry)
1819 acpi_video_dev_unregister_backlight(dev);
1820 mutex_unlock(&video->device_list_lock);
1821
Hans de Goede99678ed2014-05-15 13:22:33 +02001822 video->backlight_registered = false;
1823
Aaron Lu67b662e2013-10-11 21:27:44 +08001824 return error;
1825}
1826
1827static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1828{
1829 acpi_status status;
1830 struct acpi_device *adev = device->dev;
1831
1832 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1833 acpi_video_device_notify, device);
1834 if (ACPI_FAILURE(status))
1835 dev_err(&adev->dev, "Error installing notify handler\n");
1836 else
1837 device->flags.notify = 1;
1838}
1839
1840static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1841{
1842 struct input_dev *input;
1843 struct acpi_video_device *dev;
1844 int error;
1845
1846 video->input = input = input_allocate_device();
1847 if (!input) {
1848 error = -ENOMEM;
1849 goto out;
1850 }
1851
1852 error = acpi_video_bus_start_devices(video);
1853 if (error)
1854 goto err_free_input;
1855
1856 snprintf(video->phys, sizeof(video->phys),
1857 "%s/video/input0", acpi_device_hid(video->device));
1858
1859 input->name = acpi_device_name(video->device);
1860 input->phys = video->phys;
1861 input->id.bustype = BUS_HOST;
1862 input->id.product = 0x06;
1863 input->dev.parent = &video->device->dev;
1864 input->evbit[0] = BIT(EV_KEY);
1865 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1866 set_bit(KEY_VIDEO_NEXT, input->keybit);
1867 set_bit(KEY_VIDEO_PREV, input->keybit);
1868 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1869 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1870 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1871 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1872 set_bit(KEY_DISPLAY_OFF, input->keybit);
1873
1874 error = input_register_device(input);
1875 if (error)
1876 goto err_stop_dev;
1877
1878 mutex_lock(&video->device_list_lock);
1879 list_for_each_entry(dev, &video->video_device_list, entry)
1880 acpi_video_dev_add_notify_handler(dev);
1881 mutex_unlock(&video->device_list_lock);
1882
1883 return 0;
1884
1885err_stop_dev:
1886 acpi_video_bus_stop_devices(video);
1887err_free_input:
1888 input_free_device(input);
1889 video->input = NULL;
1890out:
1891 return error;
1892}
1893
1894static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
1895{
1896 if (dev->flags.notify) {
1897 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
1898 acpi_video_device_notify);
1899 dev->flags.notify = 0;
1900 }
1901}
1902
1903static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
1904{
1905 struct acpi_video_device *dev;
1906
1907 mutex_lock(&video->device_list_lock);
1908 list_for_each_entry(dev, &video->video_device_list, entry)
1909 acpi_video_dev_remove_notify_handler(dev);
1910 mutex_unlock(&video->device_list_lock);
1911
1912 acpi_video_bus_stop_devices(video);
1913 input_unregister_device(video->input);
1914 video->input = NULL;
1915}
1916
1917static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1918{
1919 struct acpi_video_device *dev, *next;
1920
1921 mutex_lock(&video->device_list_lock);
1922 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1923 list_del(&dev->entry);
1924 kfree(dev);
1925 }
1926 mutex_unlock(&video->device_list_lock);
1927
1928 return 0;
1929}
1930
Rafael J. Wysockiac7729d2010-04-05 01:43:51 +02001931static int instance;
1932
Len Brown4be44fc2005-08-05 00:44:28 -04001933static int acpi_video_bus_add(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001934{
Dmitry Torokhovf51e8392007-11-05 11:43:30 -05001935 struct acpi_video_bus *video;
Dmitry Torokhovf51e8392007-11-05 11:43:30 -05001936 int error;
Zhang Ruic504f8c2009-12-30 15:59:23 +08001937 acpi_status status;
1938
1939 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1940 device->parent->handle, 1,
1941 acpi_video_bus_match, NULL,
1942 device, NULL);
1943 if (status == AE_ALREADY_EXISTS) {
1944 printk(KERN_WARNING FW_BUG
1945 "Duplicate ACPI video bus devices for the"
1946 " same VGA controller, please try module "
1947 "parameter \"video.allow_duplicates=1\""
1948 "if the current driver doesn't work.\n");
1949 if (!allow_duplicates)
1950 return -ENODEV;
1951 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001952
Burman Yan36bcbec2006-12-19 12:56:11 -08001953 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001954 if (!video)
Patrick Mocheld550d982006-06-27 00:41:40 -04001955 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001956
Zhang Ruie6d9da12007-08-25 02:23:31 -04001957 /* a hack to fix the duplicate name "VID" problem on T61 */
1958 if (!strcmp(device->pnp.bus_id, "VID")) {
1959 if (instance)
1960 device->pnp.bus_id[3] = '0' + instance;
Felipe Contreras915ea7e2013-08-03 22:12:50 +02001961 instance++;
Zhang Ruie6d9da12007-08-25 02:23:31 -04001962 }
Zhao Yakuif3b39f12009-02-02 22:55:01 -05001963 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1964 if (!strcmp(device->pnp.bus_id, "VGA")) {
1965 if (instance)
1966 device->pnp.bus_id[3] = '0' + instance;
1967 instance++;
1968 }
Zhang Ruie6d9da12007-08-25 02:23:31 -04001969
Patrick Mochele6afa0d2006-05-19 16:54:40 -04001970 video->device = device;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001971 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1972 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
Pavel Machekdb89b4f2008-09-22 14:37:34 -07001973 device->driver_data = video;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001974
1975 acpi_video_bus_find_cap(video);
Dmitry Torokhovf51e8392007-11-05 11:43:30 -05001976 error = acpi_video_bus_check(video);
1977 if (error)
1978 goto err_free_video;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001979
Dmitry Torokhovbbac81f2007-11-05 11:43:32 -05001980 mutex_init(&video->device_list_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001981 INIT_LIST_HEAD(&video->video_device_list);
1982
Igor Murzovea9f8852012-03-30 21:32:08 +04001983 error = acpi_video_bus_get_devices(video, device);
1984 if (error)
Aaron Lu91e13aa2013-04-25 02:47:49 +00001985 goto err_put_video;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001986
Linus Torvalds1da177e2005-04-16 15:20:36 -07001987 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
Len Brown4be44fc2005-08-05 00:44:28 -04001988 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1989 video->flags.multihead ? "yes" : "no",
1990 video->flags.rom ? "yes" : "no",
1991 video->flags.post ? "yes" : "no");
Aaron Lu67b662e2013-10-11 21:27:44 +08001992 mutex_lock(&video_list_lock);
1993 list_add_tail(&video->entry, &video_bus_head);
1994 mutex_unlock(&video_list_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001995
Aaron Lu67b662e2013-10-11 21:27:44 +08001996 acpi_video_bus_register_backlight(video);
1997 acpi_video_bus_add_notify_handler(video);
Rafael J. Wysockiac7729d2010-04-05 01:43:51 +02001998
Dmitry Torokhovf51e8392007-11-05 11:43:30 -05001999 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002000
Aaron Lu67b662e2013-10-11 21:27:44 +08002001err_put_video:
Dmitry Torokhovf51e8392007-11-05 11:43:30 -05002002 acpi_video_bus_put_devices(video);
2003 kfree(video->attached_array);
Aaron Lu67b662e2013-10-11 21:27:44 +08002004err_free_video:
Dmitry Torokhovf51e8392007-11-05 11:43:30 -05002005 kfree(video);
Pavel Machekdb89b4f2008-09-22 14:37:34 -07002006 device->driver_data = NULL;
Dmitry Torokhovf51e8392007-11-05 11:43:30 -05002007
2008 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002009}
2010
Rafael J. Wysocki51fac832013-01-24 00:24:48 +01002011static int acpi_video_bus_remove(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002012{
Len Brown4be44fc2005-08-05 00:44:28 -04002013 struct acpi_video_bus *video = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002014
Linus Torvalds1da177e2005-04-16 15:20:36 -07002015
2016 if (!device || !acpi_driver_data(device))
Patrick Mocheld550d982006-06-27 00:41:40 -04002017 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002018
Jan Engelhardt50dd0962006-10-01 00:28:50 +02002019 video = acpi_driver_data(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002020
Aaron Lu67b662e2013-10-11 21:27:44 +08002021 acpi_video_bus_remove_notify_handler(video);
2022 acpi_video_bus_unregister_backlight(video);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002023 acpi_video_bus_put_devices(video);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002024
Aaron Lu67b662e2013-10-11 21:27:44 +08002025 mutex_lock(&video_list_lock);
2026 list_del(&video->entry);
2027 mutex_unlock(&video_list_lock);
2028
Jesper Juhl6044ec82005-11-07 01:01:32 -08002029 kfree(video->attached_array);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002030 kfree(video);
2031
Patrick Mocheld550d982006-06-27 00:41:40 -04002032 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002033}
2034
Alan Coxc6996bd2012-04-25 14:33:48 +01002035static int __init is_i740(struct pci_dev *dev)
2036{
2037 if (dev->device == 0x00D1)
2038 return 1;
2039 if (dev->device == 0x7000)
2040 return 1;
2041 return 0;
2042}
2043
Matthew Garrett74a365b2009-03-19 21:35:39 +00002044static int __init intel_opregion_present(void)
2045{
Alan Coxc6996bd2012-04-25 14:33:48 +01002046 int opregion = 0;
Matthew Garrett74a365b2009-03-19 21:35:39 +00002047 struct pci_dev *dev = NULL;
2048 u32 address;
2049
2050 for_each_pci_dev(dev) {
2051 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2052 continue;
2053 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2054 continue;
Alan Coxc6996bd2012-04-25 14:33:48 +01002055 /* We don't want to poke around undefined i740 registers */
2056 if (is_i740(dev))
2057 continue;
Matthew Garrett74a365b2009-03-19 21:35:39 +00002058 pci_read_config_dword(dev, 0xfc, &address);
2059 if (!address)
2060 continue;
Alan Coxc6996bd2012-04-25 14:33:48 +01002061 opregion = 1;
Matthew Garrett74a365b2009-03-19 21:35:39 +00002062 }
Alan Coxc6996bd2012-04-25 14:33:48 +01002063 return opregion;
Matthew Garrett74a365b2009-03-19 21:35:39 +00002064}
2065
Rafael J. Wysocki8e5c2b72013-07-25 21:43:39 +02002066int acpi_video_register(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002067{
Hans de Goede2a8b18e2015-06-16 16:27:54 +02002068 int ret = 0;
Chris Wilson28d63402015-03-01 10:41:38 +00002069
Hans de Goede970530c2016-01-14 09:41:45 +01002070 mutex_lock(&register_count_mutex);
2071 if (register_count) {
Zhao Yakui86e437f2009-06-16 11:23:13 +08002072 /*
Rafael J. Wysocki8e5c2b72013-07-25 21:43:39 +02002073 * if the function of acpi_video_register is already called,
2074 * don't register the acpi_vide_bus again and return no error.
Zhao Yakui86e437f2009-06-16 11:23:13 +08002075 */
Hans de Goede2a8b18e2015-06-16 16:27:54 +02002076 goto leave;
Zhao Yakui86e437f2009-06-16 11:23:13 +08002077 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002078
Hans de Goede7ee33ba2015-06-16 16:27:53 +02002079 dmi_check_system(video_dmi_table);
2080
Chris Wilson28d63402015-03-01 10:41:38 +00002081 ret = acpi_bus_register_driver(&acpi_video_bus);
2082 if (ret)
Hans de Goede2a8b18e2015-06-16 16:27:54 +02002083 goto leave;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002084
Zhao Yakui86e437f2009-06-16 11:23:13 +08002085 /*
2086 * When the acpi_video_bus is loaded successfully, increase
2087 * the counter reference.
2088 */
Hans de Goede970530c2016-01-14 09:41:45 +01002089 register_count = 1;
Zhao Yakui86e437f2009-06-16 11:23:13 +08002090
Hans de Goede2a8b18e2015-06-16 16:27:54 +02002091leave:
Hans de Goede970530c2016-01-14 09:41:45 +01002092 mutex_unlock(&register_count_mutex);
Hans de Goede2a8b18e2015-06-16 16:27:54 +02002093 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002094}
Rafael J. Wysocki8e5c2b72013-07-25 21:43:39 +02002095EXPORT_SYMBOL(acpi_video_register);
Matthew Garrett74a365b2009-03-19 21:35:39 +00002096
Zhao Yakui86e437f2009-06-16 11:23:13 +08002097void acpi_video_unregister(void)
2098{
Hans de Goede970530c2016-01-14 09:41:45 +01002099 mutex_lock(&register_count_mutex);
2100 if (register_count) {
Hans de Goede2a8b18e2015-06-16 16:27:54 +02002101 acpi_bus_unregister_driver(&acpi_video_bus);
Hans de Goede970530c2016-01-14 09:41:45 +01002102 register_count = 0;
Zhao Yakui86e437f2009-06-16 11:23:13 +08002103 }
Hans de Goede970530c2016-01-14 09:41:45 +01002104 mutex_unlock(&register_count_mutex);
Zhao Yakui86e437f2009-06-16 11:23:13 +08002105}
2106EXPORT_SYMBOL(acpi_video_unregister);
2107
Hans de Goede1b7f37e2014-05-17 10:48:01 +02002108void acpi_video_unregister_backlight(void)
2109{
2110 struct acpi_video_bus *video;
2111
Hans de Goede970530c2016-01-14 09:41:45 +01002112 mutex_lock(&register_count_mutex);
2113 if (register_count) {
Hans de Goede2a8b18e2015-06-16 16:27:54 +02002114 mutex_lock(&video_list_lock);
2115 list_for_each_entry(video, &video_bus_head, entry)
2116 acpi_video_bus_unregister_backlight(video);
2117 mutex_unlock(&video_list_lock);
2118 }
Hans de Goede970530c2016-01-14 09:41:45 +01002119 mutex_unlock(&register_count_mutex);
Hans de Goede1b7f37e2014-05-17 10:48:01 +02002120}
Hans de Goede1b7f37e2014-05-17 10:48:01 +02002121
Hans de Goede90b066b2015-12-22 19:09:48 +01002122bool acpi_video_handles_brightness_key_presses(void)
2123{
2124 bool have_video_busses;
2125
2126 mutex_lock(&video_list_lock);
2127 have_video_busses = !list_empty(&video_bus_head);
2128 mutex_unlock(&video_list_lock);
2129
Hans de Goede05bc59a2015-12-22 19:09:51 +01002130 return have_video_busses &&
2131 (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS);
Hans de Goede90b066b2015-12-22 19:09:48 +01002132}
2133EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses);
2134
Matthew Garrett74a365b2009-03-19 21:35:39 +00002135/*
2136 * This is kind of nasty. Hardware using Intel chipsets may require
2137 * the video opregion code to be run first in order to initialise
2138 * state before any ACPI video calls are made. To handle this we defer
2139 * registration of the video class until the opregion code has run.
2140 */
2141
2142static int __init acpi_video_init(void)
2143{
Chris Wilson6e17cb12015-03-01 10:41:37 +00002144 /*
2145 * Let the module load even if ACPI is disabled (e.g. due to
2146 * a broken BIOS) so that i915.ko can still be loaded on such
2147 * old systems without an AcpiOpRegion.
2148 *
2149 * acpi_video_register() will report -ENODEV later as well due
2150 * to acpi_disabled when i915.ko tries to register itself afterwards.
2151 */
2152 if (acpi_disabled)
2153 return 0;
2154
Matthew Garrett74a365b2009-03-19 21:35:39 +00002155 if (intel_opregion_present())
2156 return 0;
2157
2158 return acpi_video_register();
2159}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002160
Zhao Yakui86e437f2009-06-16 11:23:13 +08002161static void __exit acpi_video_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002162{
Hans de Goede93a291d2015-06-16 16:27:52 +02002163 acpi_video_detect_exit();
Zhao Yakui86e437f2009-06-16 11:23:13 +08002164 acpi_video_unregister();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002165
Patrick Mocheld550d982006-06-27 00:41:40 -04002166 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002167}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002168
2169module_init(acpi_video_init);
2170module_exit(acpi_video_exit);