blob: 4361bc98ef4c7a1f64272b24f2213b0a28f08f27 [file] [log] [blame]
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
Len Brown4be44fc2005-08-05 00:44:28 -0400221static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
222static void acpi_video_device_rebind(struct acpi_video_bus *video);
223static void acpi_video_device_bind(struct acpi_video_bus *video,
224 struct acpi_video_device *device);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225static int acpi_video_device_enumerate(struct acpi_video_bus *video);
Yu Luming2f3d0002006-11-11 02:40:34 +0800226static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
227 int level);
228static int acpi_video_device_lcd_get_level_current(
229 struct acpi_video_device *device,
Danny Baumanna89803d2013-03-19 16:22:50 +0000230 unsigned long long *level, bool raw);
Len Brown4be44fc2005-08-05 00:44:28 -0400231static int acpi_video_get_next_level(struct acpi_video_device *device,
232 u32 level_current, u32 event);
Linus Torvalds8ab58e82014-07-18 14:32:51 +0200233static void acpi_video_switch_brightness(struct work_struct *work);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234
Felipe Contreras21fcb342013-08-01 18:43:59 -0500235/* backlight device sysfs support */
Yu Luming2f3d0002006-11-11 02:40:34 +0800236static int acpi_video_get_brightness(struct backlight_device *bd)
237{
Matthew Wilcox27663c52008-10-10 02:22:59 -0400238 unsigned long long cur_level;
Matthew Garrett38531e62007-12-26 02:03:26 +0000239 int i;
Felipe Contreras7c364e72013-08-03 22:15:21 +0200240 struct acpi_video_device *vd = bl_get_data(bd);
Zhang Ruic8890f92009-03-18 16:27:08 +0800241
Danny Baumanna89803d2013-03-19 16:22:50 +0000242 if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
Zhang Ruic8890f92009-03-18 16:27:08 +0800243 return -EINVAL;
Matthew Garrett38531e62007-12-26 02:03:26 +0000244 for (i = 2; i < vd->brightness->count; i++) {
245 if (vd->brightness->levels[i] == cur_level)
Felipe Contreras21fcb342013-08-01 18:43:59 -0500246 /*
247 * The first two entries are special - see page 575
248 * of the ACPI spec 3.0
249 */
Felipe Contreras915ea7e2013-08-03 22:12:50 +0200250 return i - 2;
Matthew Garrett38531e62007-12-26 02:03:26 +0000251 }
252 return 0;
Yu Luming2f3d0002006-11-11 02:40:34 +0800253}
254
255static int acpi_video_set_brightness(struct backlight_device *bd)
256{
Zhang Rui24450c72009-03-18 16:27:10 +0800257 int request_level = bd->props.brightness + 2;
Felipe Contreras7c364e72013-08-03 22:15:21 +0200258 struct acpi_video_device *vd = bl_get_data(bd);
Zhang Rui24450c72009-03-18 16:27:10 +0800259
Linus Torvalds8ab58e82014-07-18 14:32:51 +0200260 cancel_delayed_work(&vd->switch_brightness_work);
Zhang Rui24450c72009-03-18 16:27:10 +0800261 return acpi_video_device_lcd_set_level(vd,
262 vd->brightness->levels[request_level]);
Yu Luming2f3d0002006-11-11 02:40:34 +0800263}
264
Lionel Debrouxacc24722010-11-16 14:14:02 +0100265static const struct backlight_ops acpi_backlight_ops = {
Richard Purdie599a52d2007-02-10 23:07:48 +0000266 .get_brightness = acpi_video_get_brightness,
267 .update_status = acpi_video_set_brightness,
268};
269
Zhang Rui702ed512008-01-17 15:51:22 +0800270/* thermal cooling device callbacks */
Dmitry Torokhov4a703a82009-08-29 23:03:16 -0400271static int video_get_max_state(struct thermal_cooling_device *cooling_dev, unsigned
Matthew Garrett6503e5d2008-11-27 17:48:13 +0000272 long *state)
Zhang Rui702ed512008-01-17 15:51:22 +0800273{
Dmitry Torokhov4a703a82009-08-29 23:03:16 -0400274 struct acpi_device *device = cooling_dev->devdata;
Zhang Rui702ed512008-01-17 15:51:22 +0800275 struct acpi_video_device *video = acpi_driver_data(device);
276
Matthew Garrett6503e5d2008-11-27 17:48:13 +0000277 *state = video->brightness->count - 3;
278 return 0;
Zhang Rui702ed512008-01-17 15:51:22 +0800279}
280
Dmitry Torokhov4a703a82009-08-29 23:03:16 -0400281static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, unsigned
Matthew Garrett6503e5d2008-11-27 17:48:13 +0000282 long *state)
Zhang Rui702ed512008-01-17 15:51:22 +0800283{
Dmitry Torokhov4a703a82009-08-29 23:03:16 -0400284 struct acpi_device *device = cooling_dev->devdata;
Zhang Rui702ed512008-01-17 15:51:22 +0800285 struct acpi_video_device *video = acpi_driver_data(device);
Matthew Wilcox27663c52008-10-10 02:22:59 -0400286 unsigned long long level;
Matthew Garrett6503e5d2008-11-27 17:48:13 +0000287 int offset;
Zhang Rui702ed512008-01-17 15:51:22 +0800288
Danny Baumanna89803d2013-03-19 16:22:50 +0000289 if (acpi_video_device_lcd_get_level_current(video, &level, false))
Zhang Ruic8890f92009-03-18 16:27:08 +0800290 return -EINVAL;
Matthew Garrett6503e5d2008-11-27 17:48:13 +0000291 for (offset = 2; offset < video->brightness->count; offset++)
292 if (level == video->brightness->levels[offset]) {
293 *state = video->brightness->count - offset - 1;
294 return 0;
295 }
Zhang Rui702ed512008-01-17 15:51:22 +0800296
297 return -EINVAL;
298}
299
300static int
Dmitry Torokhov4a703a82009-08-29 23:03:16 -0400301video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
Zhang Rui702ed512008-01-17 15:51:22 +0800302{
Dmitry Torokhov4a703a82009-08-29 23:03:16 -0400303 struct acpi_device *device = cooling_dev->devdata;
Zhang Rui702ed512008-01-17 15:51:22 +0800304 struct acpi_video_device *video = acpi_driver_data(device);
305 int level;
306
Felipe Contreras915ea7e2013-08-03 22:12:50 +0200307 if (state >= video->brightness->count - 2)
Zhang Rui702ed512008-01-17 15:51:22 +0800308 return -EINVAL;
309
310 state = video->brightness->count - state;
Felipe Contreras915ea7e2013-08-03 22:12:50 +0200311 level = video->brightness->levels[state - 1];
Zhang Rui702ed512008-01-17 15:51:22 +0800312 return acpi_video_device_lcd_set_level(video, level);
313}
314
Vasiliy Kulikov9c8b04b2011-06-25 21:07:52 +0400315static const struct thermal_cooling_device_ops video_cooling_ops = {
Zhang Rui702ed512008-01-17 15:51:22 +0800316 .get_max_state = video_get_max_state,
317 .get_cur_state = video_get_cur_state,
318 .set_cur_state = video_set_cur_state,
319};
320
Felipe Contreras21fcb342013-08-01 18:43:59 -0500321/*
322 * --------------------------------------------------------------------------
323 * Video Management
324 * --------------------------------------------------------------------------
325 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327static int
Len Brown4be44fc2005-08-05 00:44:28 -0400328acpi_video_device_lcd_query_levels(struct acpi_video_device *device,
329 union acpi_object **levels)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330{
Len Brown4be44fc2005-08-05 00:44:28 -0400331 int status;
332 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
333 union acpi_object *obj;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335
336 *levels = NULL;
337
Patrick Mochel90130262006-05-19 16:54:48 -0400338 status = acpi_evaluate_object(device->dev->handle, "_BCL", NULL, &buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 if (!ACPI_SUCCESS(status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400340 return status;
Len Brown4be44fc2005-08-05 00:44:28 -0400341 obj = (union acpi_object *)buffer.pointer;
Adrian Bunk6665bda2006-03-11 10:12:00 -0500342 if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
Len Brown64684632006-06-26 23:41:38 -0400343 printk(KERN_ERR PREFIX "Invalid _BCL data\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 status = -EFAULT;
345 goto err;
346 }
347
348 *levels = obj;
349
Patrick Mocheld550d982006-06-27 00:41:40 -0400350 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351
Felipe Contreras915ea7e2013-08-03 22:12:50 +0200352err:
Jesper Juhl6044ec82005-11-07 01:01:32 -0800353 kfree(buffer.pointer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354
Patrick Mocheld550d982006-06-27 00:41:40 -0400355 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356}
357
358static int
Len Brown4be44fc2005-08-05 00:44:28 -0400359acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360{
Zhang Rui24450c72009-03-18 16:27:10 +0800361 int status;
Zhang Rui9e6dada2008-12-31 10:58:48 +0800362 int state;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363
Jiang Liu0db98202013-06-29 00:24:39 +0800364 status = acpi_execute_simple_method(device->dev->handle,
365 "_BCM", level);
Zhang Rui24450c72009-03-18 16:27:10 +0800366 if (ACPI_FAILURE(status)) {
367 ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
368 return -EIO;
369 }
370
Alexey Starikovskiy4500ca82007-09-03 16:29:58 +0400371 device->brightness->curr = level;
Zhang Rui9e6dada2008-12-31 10:58:48 +0800372 for (state = 2; state < device->brightness->count; state++)
Zhang Rui24450c72009-03-18 16:27:10 +0800373 if (level == device->brightness->levels[state]) {
Zhang Rui1a7c6182009-03-18 16:27:16 +0800374 if (device->backlight)
375 device->backlight->props.brightness = state - 2;
Zhang Rui24450c72009-03-18 16:27:10 +0800376 return 0;
377 }
Zhang Rui9e6dada2008-12-31 10:58:48 +0800378
Zhang Rui24450c72009-03-18 16:27:10 +0800379 ACPI_ERROR((AE_INFO, "Current brightness invalid"));
380 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381}
382
Zhang Rui45cb50e2009-04-24 12:13:18 -0400383/*
384 * For some buggy _BQC methods, we need to add a constant value to
385 * the _BQC return value to get the actual current brightness level
386 */
387
388static int bqc_offset_aml_bug_workaround;
Hans de Goede7ee33ba2015-06-16 16:27:53 +0200389static int video_set_bqc_offset(const struct dmi_system_id *d)
Zhang Rui45cb50e2009-04-24 12:13:18 -0400390{
391 bqc_offset_aml_bug_workaround = 9;
392 return 0;
393}
394
Hans de Goede7ee33ba2015-06-16 16:27:53 +0200395static int video_disable_backlight_sysfs_if(
Hans de Goede654a1822015-06-09 10:32:25 +0200396 const struct dmi_system_id *d)
397{
398 if (disable_backlight_sysfs_if == -1)
399 disable_backlight_sysfs_if = 1;
400 return 0;
401}
402
Aaron Lue50b9be2015-10-28 15:09:23 +0800403static int video_set_device_id_scheme(const struct dmi_system_id *d)
404{
405 device_id_scheme = true;
406 return 0;
407}
408
409static int video_enable_only_lcd(const struct dmi_system_id *d)
410{
411 only_lcd = true;
412 return 0;
413}
414
Hans de Goede4b4b3b22015-12-22 19:09:52 +0100415static int video_set_report_key_events(const struct dmi_system_id *id)
416{
417 if (report_key_events == -1)
418 report_key_events = (uintptr_t)id->driver_data;
419 return 0;
420}
421
Hans de Goede7ee33ba2015-06-16 16:27:53 +0200422static struct dmi_system_id video_dmi_table[] = {
Zhang Rui45cb50e2009-04-24 12:13:18 -0400423 /*
424 * Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
425 */
426 {
427 .callback = video_set_bqc_offset,
428 .ident = "Acer Aspire 5720",
429 .matches = {
430 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
431 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
432 },
433 },
Len Brown5afc4ab2009-05-07 21:11:56 -0400434 {
435 .callback = video_set_bqc_offset,
436 .ident = "Acer Aspire 5710Z",
437 .matches = {
438 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
439 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
440 },
441 },
Zhang Rui34ac2722009-05-26 23:35:34 -0400442 {
443 .callback = video_set_bqc_offset,
444 .ident = "eMachines E510",
445 .matches = {
446 DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
447 DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
448 },
449 },
Zhang Rui93bcece2009-05-19 15:08:41 -0400450 {
451 .callback = video_set_bqc_offset,
452 .ident = "Acer Aspire 5315",
453 .matches = {
454 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
455 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
456 },
457 },
Zhang Rui152a4e62009-06-22 11:31:18 +0800458 {
459 .callback = video_set_bqc_offset,
460 .ident = "Acer Aspire 7720",
461 .matches = {
462 DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
463 DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
464 },
465 },
Hans de Goede5f240792014-08-28 10:20:46 +0200466
467 /*
Hans de Goede654a1822015-06-09 10:32:25 +0200468 * Some machines have a broken acpi-video interface for brightness
469 * control, but still need an acpi_video_device_lcd_set_level() call
470 * on resume to turn the backlight power on. We Enable backlight
471 * control on these systems, but do not register a backlight sysfs
472 * as brightness control does not work.
473 */
474 {
Hans de Goedede588b82016-01-11 14:46:17 +0100475 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
476 .callback = video_disable_backlight_sysfs_if,
477 .ident = "Toshiba Portege R700",
478 .matches = {
479 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
480 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R700"),
481 },
482 },
483 {
Hans de Goede654a1822015-06-09 10:32:25 +0200484 /* https://bugs.freedesktop.org/show_bug.cgi?id=82634 */
485 .callback = video_disable_backlight_sysfs_if,
486 .ident = "Toshiba Portege R830",
487 .matches = {
488 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
489 DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R830"),
490 },
491 },
Hans de Goedeb21f2e82016-01-14 14:24:39 +0100492 {
493 /* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
494 .callback = video_disable_backlight_sysfs_if,
495 .ident = "Toshiba Satellite R830",
496 .matches = {
497 DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
498 DMI_MATCH(DMI_PRODUCT_NAME, "SATELLITE R830"),
499 },
500 },
Aaron Lue50b9be2015-10-28 15:09:23 +0800501 /*
502 * Some machine's _DOD IDs don't have bit 31(Device ID Scheme) set
503 * but the IDs actually follow the Device ID Scheme.
504 */
505 {
506 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
507 .callback = video_set_device_id_scheme,
508 .ident = "ESPRIMO Mobile M9410",
509 .matches = {
510 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
511 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"),
512 },
513 },
514 /*
515 * Some machines have multiple video output devices, but only the one
516 * that is the type of LCD can do the backlight control so we should not
517 * register backlight interface for other video output devices.
518 */
519 {
520 /* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
521 .callback = video_enable_only_lcd,
522 .ident = "ESPRIMO Mobile M9410",
523 .matches = {
524 DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
525 DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"),
526 },
527 },
Hans de Goede4b4b3b22015-12-22 19:09:52 +0100528 /*
529 * Some machines report wrong key events on the acpi-bus, suppress
530 * key event reporting on these. Note this is only intended to work
531 * around events which are plain wrong. In some cases we get double
532 * events, in this case acpi-video is considered the canonical source
533 * and the events from the other source should be filtered. E.g.
534 * by calling acpi_video_handles_brightness_key_presses() from the
535 * vendor acpi/wmi driver or by using /lib/udev/hwdb.d/60-keyboard.hwdb
536 */
537 {
538 .callback = video_set_report_key_events,
539 .driver_data = (void *)((uintptr_t)REPORT_OUTPUT_KEY_EVENTS),
540 .ident = "Dell Vostro V131",
541 .matches = {
542 DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
543 DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
544 },
545 },
Zhang Rui45cb50e2009-04-24 12:13:18 -0400546 {}
547};
548
Danny Baumann994fa632013-03-19 16:22:52 +0000549static unsigned long long
550acpi_video_bqc_value_to_level(struct acpi_video_device *device,
551 unsigned long long bqc_value)
552{
553 unsigned long long level;
554
555 if (device->brightness->flags._BQC_use_index) {
556 /*
557 * _BQC returns an index that doesn't account for
558 * the first 2 items with special meaning, so we need
559 * to compensate for that by offsetting ourselves
560 */
561 if (device->brightness->flags._BCL_reversed)
562 bqc_value = device->brightness->count - 3 - bqc_value;
563
564 level = device->brightness->levels[bqc_value + 2];
565 } else {
566 level = bqc_value;
567 }
568
569 level += bqc_offset_aml_bug_workaround;
570
571 return level;
572}
573
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574static int
Len Brown4be44fc2005-08-05 00:44:28 -0400575acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
Danny Baumanna89803d2013-03-19 16:22:50 +0000576 unsigned long long *level, bool raw)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577{
Zhang Ruic8890f92009-03-18 16:27:08 +0800578 acpi_status status = AE_OK;
Vladimir Serbinenko4e231fa2009-06-24 15:17:36 +0800579 int i;
Zhang Ruic8890f92009-03-18 16:27:08 +0800580
Zhang Ruic60d6382009-03-18 16:27:18 +0800581 if (device->cap._BQC || device->cap._BCQ) {
582 char *buf = device->cap._BQC ? "_BQC" : "_BCQ";
583
584 status = acpi_evaluate_integer(device->dev->handle, buf,
Zhang Ruic8890f92009-03-18 16:27:08 +0800585 NULL, level);
586 if (ACPI_SUCCESS(status)) {
Danny Baumanna89803d2013-03-19 16:22:50 +0000587 if (raw) {
588 /*
589 * Caller has indicated he wants the raw
590 * value returned by _BQC, so don't furtherly
591 * mess with the value.
592 */
593 return 0;
594 }
595
Danny Baumann994fa632013-03-19 16:22:52 +0000596 *level = acpi_video_bqc_value_to_level(device, *level);
Zhang Rui1a7c6182009-03-18 16:27:16 +0800597
Vladimir Serbinenko4e231fa2009-06-24 15:17:36 +0800598 for (i = 2; i < device->brightness->count; i++)
599 if (device->brightness->levels[i] == *level) {
600 device->brightness->curr = *level;
601 return 0;
Felipe Contreras915ea7e2013-08-03 22:12:50 +0200602 }
Danny Baumanna89803d2013-03-19 16:22:50 +0000603 /*
604 * BQC returned an invalid level.
605 * Stop using it.
606 */
607 ACPI_WARNING((AE_INFO,
608 "%s returned an invalid level",
609 buf));
610 device->cap._BQC = device->cap._BCQ = 0;
Zhang Ruic8890f92009-03-18 16:27:08 +0800611 } else {
Felipe Contreras21fcb342013-08-01 18:43:59 -0500612 /*
613 * Fixme:
Zhang Ruic8890f92009-03-18 16:27:08 +0800614 * should we return an error or ignore this failure?
615 * dev->brightness->curr is a cached value which stores
616 * the correct current backlight level in most cases.
617 * ACPI video backlight still works w/ buggy _BQC.
618 * http://bugzilla.kernel.org/show_bug.cgi?id=12233
619 */
Zhang Ruic60d6382009-03-18 16:27:18 +0800620 ACPI_WARNING((AE_INFO, "Evaluating %s failed", buf));
621 device->cap._BQC = device->cap._BCQ = 0;
Zhang Ruic8890f92009-03-18 16:27:08 +0800622 }
623 }
624
Alexey Starikovskiy4500ca82007-09-03 16:29:58 +0400625 *level = device->brightness->curr;
Zhang Ruic8890f92009-03-18 16:27:08 +0800626 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627}
628
629static int
Len Brown4be44fc2005-08-05 00:44:28 -0400630acpi_video_device_EDID(struct acpi_video_device *device,
631 union acpi_object **edid, ssize_t length)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632{
Len Brown4be44fc2005-08-05 00:44:28 -0400633 int status;
634 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
635 union acpi_object *obj;
636 union acpi_object arg0 = { ACPI_TYPE_INTEGER };
637 struct acpi_object_list args = { 1, &arg0 };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639
640 *edid = NULL;
641
642 if (!device)
Patrick Mocheld550d982006-06-27 00:41:40 -0400643 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 if (length == 128)
645 arg0.integer.value = 1;
646 else if (length == 256)
647 arg0.integer.value = 2;
648 else
Patrick Mocheld550d982006-06-27 00:41:40 -0400649 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650
Patrick Mochel90130262006-05-19 16:54:48 -0400651 status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652 if (ACPI_FAILURE(status))
Patrick Mocheld550d982006-06-27 00:41:40 -0400653 return -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654
Jan Engelhardt50dd0962006-10-01 00:28:50 +0200655 obj = buffer.pointer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656
657 if (obj && obj->type == ACPI_TYPE_BUFFER)
658 *edid = obj;
659 else {
Len Brown64684632006-06-26 23:41:38 -0400660 printk(KERN_ERR PREFIX "Invalid _DDC data\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661 status = -EFAULT;
662 kfree(obj);
663 }
664
Patrick Mocheld550d982006-06-27 00:41:40 -0400665 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666}
667
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668/* bus */
669
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670/*
671 * Arg:
Felipe Contreras21fcb342013-08-01 18:43:59 -0500672 * video : video bus device pointer
673 * bios_flag :
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674 * 0. The system BIOS should NOT automatically switch(toggle)
675 * the active display output.
676 * 1. The system BIOS should automatically switch (toggle) the
Julius Volz98fb8fe2007-02-20 16:38:40 +0100677 * active display output. No switch event.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678 * 2. The _DGS value should be locked.
679 * 3. The system BIOS should not automatically switch (toggle) the
680 * active display output, but instead generate the display switch
681 * event notify code.
682 * lcd_flag :
683 * 0. The system BIOS should automatically control the brightness level
Julius Volz98fb8fe2007-02-20 16:38:40 +0100684 * of the LCD when the power changes from AC to DC
Felipe Contreras21fcb342013-08-01 18:43:59 -0500685 * 1. The system BIOS should NOT automatically control the brightness
Julius Volz98fb8fe2007-02-20 16:38:40 +0100686 * level of the LCD when the power changes from AC to DC.
Felipe Contreras21fcb342013-08-01 18:43:59 -0500687 * Return Value:
Igor Murzovea9f8852012-03-30 21:32:08 +0400688 * -EINVAL wrong arg.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689 */
690
691static int
Len Brown4be44fc2005-08-05 00:44:28 -0400692acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693{
Igor Murzovea9f8852012-03-30 21:32:08 +0400694 acpi_status status;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695
Zhang Ruib0373842012-06-20 09:48:43 +0800696 if (!video->cap._DOS)
697 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698
Igor Murzovea9f8852012-03-30 21:32:08 +0400699 if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1)
700 return -EINVAL;
Jiang Liu0db98202013-06-29 00:24:39 +0800701 video->dos_setting = (lcd_flag << 2) | bios_flag;
702 status = acpi_execute_simple_method(video->device->handle, "_DOS",
703 (lcd_flag << 2) | bios_flag);
Igor Murzovea9f8852012-03-30 21:32:08 +0400704 if (ACPI_FAILURE(status))
705 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706
Igor Murzovea9f8852012-03-30 21:32:08 +0400707 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708}
709
710/*
Zhang Rui935e5f22008-12-11 16:24:52 -0500711 * Simple comparison function used to sort backlight levels.
712 */
713
714static int
715acpi_video_cmp_level(const void *a, const void *b)
716{
717 return *(int *)a - *(int *)b;
718}
719
720/*
Aaron Lua50188d2013-04-22 14:08:32 +0200721 * Decides if _BQC/_BCQ for this system is usable
722 *
723 * We do this by changing the level first and then read out the current
724 * brightness level, if the value does not match, find out if it is using
725 * index. If not, clear the _BQC/_BCQ capability.
726 */
727static int acpi_video_bqc_quirk(struct acpi_video_device *device,
728 int max_level, int current_level)
729{
730 struct acpi_video_device_brightness *br = device->brightness;
731 int result;
732 unsigned long long level;
733 int test_level;
734
735 /* don't mess with existing known broken systems */
736 if (bqc_offset_aml_bug_workaround)
737 return 0;
738
739 /*
740 * Some systems always report current brightness level as maximum
741 * through _BQC, we need to test another value for them.
742 */
Felipe Contrerasb3b301c2013-08-03 23:00:25 +0200743 test_level = current_level == max_level ? br->levels[3] : max_level;
Aaron Lua50188d2013-04-22 14:08:32 +0200744
745 result = acpi_video_device_lcd_set_level(device, test_level);
746 if (result)
747 return result;
748
749 result = acpi_video_device_lcd_get_level_current(device, &level, true);
750 if (result)
751 return result;
752
753 if (level != test_level) {
754 /* buggy _BQC found, need to find out if it uses index */
755 if (level < br->count) {
756 if (br->flags._BCL_reversed)
757 level = br->count - 3 - level;
758 if (br->levels[level + 2] == test_level)
759 br->flags._BQC_use_index = 1;
760 }
761
762 if (!br->flags._BQC_use_index)
763 device->cap._BQC = device->cap._BCQ = 0;
764 }
765
766 return 0;
767}
768
769
770/*
Felipe Contreras21fcb342013-08-01 18:43:59 -0500771 * Arg:
772 * device : video output device (LCD, CRT, ..)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773 *
774 * Return Value:
Julia Jomantaite469778c2008-06-23 22:50:42 +0100775 * Maximum brightness level
776 *
777 * Allocate and initialize device->brightness.
778 */
779
780static int
781acpi_video_init_brightness(struct acpi_video_device *device)
782{
783 union acpi_object *obj = NULL;
Zhang Ruid32f6942009-03-18 16:27:12 +0800784 int i, max_level = 0, count = 0, level_ac_battery = 0;
Zhang Rui1a7c6182009-03-18 16:27:16 +0800785 unsigned long long level, level_old;
Julia Jomantaite469778c2008-06-23 22:50:42 +0100786 union acpi_object *o;
787 struct acpi_video_device_brightness *br = NULL;
Zhang Rui1a7c6182009-03-18 16:27:16 +0800788 int result = -EINVAL;
Hans de Goedebd8ba202014-02-13 16:32:51 +0100789 u32 value;
Julia Jomantaite469778c2008-06-23 22:50:42 +0100790
791 if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
792 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
793 "LCD brightness level\n"));
794 goto out;
795 }
796
797 if (obj->package.count < 2)
798 goto out;
799
800 br = kzalloc(sizeof(*br), GFP_KERNEL);
801 if (!br) {
802 printk(KERN_ERR "can't allocate memory\n");
Zhang Rui1a7c6182009-03-18 16:27:16 +0800803 result = -ENOMEM;
Julia Jomantaite469778c2008-06-23 22:50:42 +0100804 goto out;
805 }
806
Zhang Ruid32f6942009-03-18 16:27:12 +0800807 br->levels = kmalloc((obj->package.count + 2) * sizeof *(br->levels),
Julia Jomantaite469778c2008-06-23 22:50:42 +0100808 GFP_KERNEL);
Zhang Rui1a7c6182009-03-18 16:27:16 +0800809 if (!br->levels) {
810 result = -ENOMEM;
Julia Jomantaite469778c2008-06-23 22:50:42 +0100811 goto out_free;
Zhang Rui1a7c6182009-03-18 16:27:16 +0800812 }
Julia Jomantaite469778c2008-06-23 22:50:42 +0100813
814 for (i = 0; i < obj->package.count; i++) {
815 o = (union acpi_object *)&obj->package.elements[i];
816 if (o->type != ACPI_TYPE_INTEGER) {
817 printk(KERN_ERR PREFIX "Invalid data\n");
818 continue;
819 }
Hans de Goedebd8ba202014-02-13 16:32:51 +0100820 value = (u32) o->integer.value;
821 /* Skip duplicate entries */
822 if (count > 2 && br->levels[count - 1] == value)
823 continue;
824
825 br->levels[count] = value;
Julia Jomantaite469778c2008-06-23 22:50:42 +0100826
827 if (br->levels[count] > max_level)
828 max_level = br->levels[count];
829 count++;
830 }
831
Zhang Ruid32f6942009-03-18 16:27:12 +0800832 /*
833 * some buggy BIOS don't export the levels
834 * when machine is on AC/Battery in _BCL package.
835 * In this case, the first two elements in _BCL packages
836 * are also supported brightness levels that OS should take care of.
837 */
Zhang Rui90af2cf2009-04-14 11:02:18 +0800838 for (i = 2; i < count; i++) {
839 if (br->levels[i] == br->levels[0])
Zhang Ruid32f6942009-03-18 16:27:12 +0800840 level_ac_battery++;
Zhang Rui90af2cf2009-04-14 11:02:18 +0800841 if (br->levels[i] == br->levels[1])
842 level_ac_battery++;
843 }
Zhang Rui935e5f22008-12-11 16:24:52 -0500844
Zhang Ruid32f6942009-03-18 16:27:12 +0800845 if (level_ac_battery < 2) {
846 level_ac_battery = 2 - level_ac_battery;
847 br->flags._BCL_no_ac_battery_levels = 1;
848 for (i = (count - 1 + level_ac_battery); i >= 2; i--)
849 br->levels[i] = br->levels[i - level_ac_battery];
850 count += level_ac_battery;
851 } else if (level_ac_battery > 2)
Colin Ian Kingbf6787e2012-11-29 11:53:13 +0000852 ACPI_ERROR((AE_INFO, "Too many duplicates in _BCL package"));
Zhang Ruid32f6942009-03-18 16:27:12 +0800853
Zhang Ruid80fb992009-03-18 16:27:14 +0800854 /* Check if the _BCL package is in a reversed order */
855 if (max_level == br->levels[2]) {
856 br->flags._BCL_reversed = 1;
857 sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
858 acpi_video_cmp_level, NULL);
859 } else if (max_level != br->levels[count - 1])
860 ACPI_ERROR((AE_INFO,
Colin Ian Kingbf6787e2012-11-29 11:53:13 +0000861 "Found unordered _BCL package"));
Julia Jomantaite469778c2008-06-23 22:50:42 +0100862
863 br->count = count;
864 device->brightness = br;
Zhang Rui1a7c6182009-03-18 16:27:16 +0800865
Zhang Rui1a7c6182009-03-18 16:27:16 +0800866 /* _BQC uses INDEX while _BCL uses VALUE in some laptops */
Zhang Rui90c53ca2009-08-31 12:39:54 -0400867 br->curr = level = max_level;
Zhang Ruie047cca2009-04-09 14:24:35 +0800868
869 if (!device->cap._BQC)
870 goto set_level;
871
Danny Baumanna89803d2013-03-19 16:22:50 +0000872 result = acpi_video_device_lcd_get_level_current(device,
873 &level_old, true);
Zhang Rui1a7c6182009-03-18 16:27:16 +0800874 if (result)
875 goto out_free_levels;
876
Aaron Lua50188d2013-04-22 14:08:32 +0200877 result = acpi_video_bqc_quirk(device, max_level, level_old);
878 if (result)
879 goto out_free_levels;
Zhang Ruie047cca2009-04-09 14:24:35 +0800880 /*
Aaron Lua50188d2013-04-22 14:08:32 +0200881 * cap._BQC may get cleared due to _BQC is found to be broken
882 * in acpi_video_bqc_quirk, so check again here.
Zhang Ruie047cca2009-04-09 14:24:35 +0800883 */
Aaron Lua50188d2013-04-22 14:08:32 +0200884 if (!device->cap._BQC)
885 goto set_level;
Zhang Rui1a7c6182009-03-18 16:27:16 +0800886
Aaron Lu545ef362013-11-15 14:39:12 +0800887 level = acpi_video_bqc_value_to_level(device, level_old);
888 /*
889 * On some buggy laptops, _BQC returns an uninitialized
890 * value when invoked for the first time, i.e.
891 * level_old is invalid (no matter whether it's a level
892 * or an index). Set the backlight to max_level in this case.
893 */
894 for (i = 2; i < br->count; i++)
895 if (level == br->levels[i])
896 break;
897 if (i == br->count || !level)
898 level = max_level;
Zhang Ruie047cca2009-04-09 14:24:35 +0800899
Zhang Ruie047cca2009-04-09 14:24:35 +0800900set_level:
Zhang Rui90c53ca2009-08-31 12:39:54 -0400901 result = acpi_video_device_lcd_set_level(device, level);
Zhang Ruie047cca2009-04-09 14:24:35 +0800902 if (result)
903 goto out_free_levels;
Zhang Rui1a7c6182009-03-18 16:27:16 +0800904
Zhang Ruid32f6942009-03-18 16:27:12 +0800905 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
906 "found %d brightness levels\n", count - 2));
Julia Jomantaite469778c2008-06-23 22:50:42 +0100907 kfree(obj);
Zhang Rui1a7c6182009-03-18 16:27:16 +0800908 return result;
Julia Jomantaite469778c2008-06-23 22:50:42 +0100909
910out_free_levels:
911 kfree(br->levels);
912out_free:
913 kfree(br);
914out:
915 device->brightness = NULL;
916 kfree(obj);
Zhang Rui1a7c6182009-03-18 16:27:16 +0800917 return result;
Julia Jomantaite469778c2008-06-23 22:50:42 +0100918}
919
920/*
921 * Arg:
922 * device : video output device (LCD, CRT, ..)
923 *
924 * Return Value:
Felipe Contreras21fcb342013-08-01 18:43:59 -0500925 * None
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926 *
Julius Volz98fb8fe2007-02-20 16:38:40 +0100927 * Find out all required AML methods defined under the output
Linus Torvalds1da177e2005-04-16 15:20:36 -0700928 * device.
929 */
930
Len Brown4be44fc2005-08-05 00:44:28 -0400931static void acpi_video_device_find_cap(struct acpi_video_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700932{
Jiang Liu952c63e2013-06-29 00:24:38 +0800933 if (acpi_has_method(device->dev->handle, "_ADR"))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934 device->cap._ADR = 1;
Jiang Liu952c63e2013-06-29 00:24:38 +0800935 if (acpi_has_method(device->dev->handle, "_BCL"))
Len Brown4be44fc2005-08-05 00:44:28 -0400936 device->cap._BCL = 1;
Jiang Liu952c63e2013-06-29 00:24:38 +0800937 if (acpi_has_method(device->dev->handle, "_BCM"))
Len Brown4be44fc2005-08-05 00:44:28 -0400938 device->cap._BCM = 1;
Jiang Liu952c63e2013-06-29 00:24:38 +0800939 if (acpi_has_method(device->dev->handle, "_BQC")) {
Yu Luming2f3d0002006-11-11 02:40:34 +0800940 device->cap._BQC = 1;
Jiang Liu952c63e2013-06-29 00:24:38 +0800941 } else if (acpi_has_method(device->dev->handle, "_BCQ")) {
Zhang Ruic60d6382009-03-18 16:27:18 +0800942 printk(KERN_WARNING FW_BUG "_BCQ is used instead of _BQC\n");
943 device->cap._BCQ = 1;
944 }
945
Jiang Liu952c63e2013-06-29 00:24:38 +0800946 if (acpi_has_method(device->dev->handle, "_DDC"))
Len Brown4be44fc2005-08-05 00:44:28 -0400947 device->cap._DDC = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948}
949
950/*
Felipe Contreras21fcb342013-08-01 18:43:59 -0500951 * Arg:
952 * device : video output device (VGA)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953 *
954 * Return Value:
Felipe Contreras21fcb342013-08-01 18:43:59 -0500955 * None
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956 *
Julius Volz98fb8fe2007-02-20 16:38:40 +0100957 * Find out all required AML methods defined under the video bus device.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700958 */
959
Len Brown4be44fc2005-08-05 00:44:28 -0400960static void acpi_video_bus_find_cap(struct acpi_video_bus *video)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961{
Jiang Liu952c63e2013-06-29 00:24:38 +0800962 if (acpi_has_method(video->device->handle, "_DOS"))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963 video->cap._DOS = 1;
Jiang Liu952c63e2013-06-29 00:24:38 +0800964 if (acpi_has_method(video->device->handle, "_DOD"))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965 video->cap._DOD = 1;
Jiang Liu952c63e2013-06-29 00:24:38 +0800966 if (acpi_has_method(video->device->handle, "_ROM"))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967 video->cap._ROM = 1;
Jiang Liu952c63e2013-06-29 00:24:38 +0800968 if (acpi_has_method(video->device->handle, "_GPD"))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700969 video->cap._GPD = 1;
Jiang Liu952c63e2013-06-29 00:24:38 +0800970 if (acpi_has_method(video->device->handle, "_SPD"))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971 video->cap._SPD = 1;
Jiang Liu952c63e2013-06-29 00:24:38 +0800972 if (acpi_has_method(video->device->handle, "_VPO"))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973 video->cap._VPO = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974}
975
976/*
977 * Check whether the video bus device has required AML method to
978 * support the desired features
979 */
980
Len Brown4be44fc2005-08-05 00:44:28 -0400981static int acpi_video_bus_check(struct acpi_video_bus *video)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982{
Len Brown4be44fc2005-08-05 00:44:28 -0400983 acpi_status status = -ENOENT;
Alexander Chiang1e4cffe2009-06-10 19:56:00 +0000984 struct pci_dev *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985
986 if (!video)
Patrick Mocheld550d982006-06-27 00:41:40 -0400987 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988
Alexander Chiang1e4cffe2009-06-10 19:56:00 +0000989 dev = acpi_get_pci_dev(video->device->handle);
Thomas Renninger22c13f92008-08-01 17:37:54 +0200990 if (!dev)
991 return -ENODEV;
Alexander Chiang1e4cffe2009-06-10 19:56:00 +0000992 pci_dev_put(dev);
Thomas Renninger22c13f92008-08-01 17:37:54 +0200993
Felipe Contreras21fcb342013-08-01 18:43:59 -0500994 /*
995 * Since there is no HID, CID and so on for VGA driver, we have
Linus Torvalds1da177e2005-04-16 15:20:36 -0700996 * to check well known required nodes.
997 */
998
Julius Volz98fb8fe2007-02-20 16:38:40 +0100999 /* Does this device support video switching? */
Stefan Bader3a1151e2009-08-21 11:03:05 +02001000 if (video->cap._DOS || video->cap._DOD) {
1001 if (!video->cap._DOS) {
1002 printk(KERN_WARNING FW_BUG
1003 "ACPI(%s) defines _DOD but not _DOS\n",
1004 acpi_device_bid(video->device));
1005 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006 video->flags.multihead = 1;
1007 status = 0;
1008 }
1009
Julius Volz98fb8fe2007-02-20 16:38:40 +01001010 /* Does this device support retrieving a video ROM? */
Len Brown4be44fc2005-08-05 00:44:28 -04001011 if (video->cap._ROM) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012 video->flags.rom = 1;
1013 status = 0;
1014 }
1015
Julius Volz98fb8fe2007-02-20 16:38:40 +01001016 /* Does this device support configuring which video device to POST? */
Len Brown4be44fc2005-08-05 00:44:28 -04001017 if (video->cap._GPD && video->cap._SPD && video->cap._VPO) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018 video->flags.post = 1;
1019 status = 0;
1020 }
1021
Patrick Mocheld550d982006-06-27 00:41:40 -04001022 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023}
1024
Felipe Contreras21fcb342013-08-01 18:43:59 -05001025/*
1026 * --------------------------------------------------------------------------
1027 * Driver Interface
1028 * --------------------------------------------------------------------------
1029 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030
1031/* device interface */
Felipe Contreras915ea7e2013-08-03 22:12:50 +02001032static struct acpi_video_device_attrib *
Rui Zhang82cae992007-01-03 23:40:53 -05001033acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id)
1034{
Dmitry Torokhov78eed022007-11-05 11:43:33 -05001035 struct acpi_video_enumerated_device *ids;
1036 int i;
Rui Zhang82cae992007-01-03 23:40:53 -05001037
Dmitry Torokhov78eed022007-11-05 11:43:33 -05001038 for (i = 0; i < video->attached_count; i++) {
1039 ids = &video->attached_array[i];
1040 if ((ids->value.int_val & 0xffff) == device_id)
1041 return &ids->value.attrib;
1042 }
1043
Rui Zhang82cae992007-01-03 23:40:53 -05001044 return NULL;
1045}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046
1047static int
Matthew Garrette92a7162010-01-12 14:17:03 -05001048acpi_video_get_device_type(struct acpi_video_bus *video,
1049 unsigned long device_id)
1050{
1051 struct acpi_video_enumerated_device *ids;
1052 int i;
1053
1054 for (i = 0; i < video->attached_count; i++) {
1055 ids = &video->attached_array[i];
1056 if ((ids->value.int_val & 0xffff) == device_id)
1057 return ids->value.int_val;
1058 }
1059
1060 return 0;
1061}
1062
1063static int
Len Brown4be44fc2005-08-05 00:44:28 -04001064acpi_video_bus_get_one_device(struct acpi_device *device,
1065 struct acpi_video_bus *video)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066{
Matthew Wilcox27663c52008-10-10 02:22:59 -04001067 unsigned long long device_id;
Matthew Garrette92a7162010-01-12 14:17:03 -05001068 int status, device_type;
Len Brown4be44fc2005-08-05 00:44:28 -04001069 struct acpi_video_device *data;
Felipe Contreras915ea7e2013-08-03 22:12:50 +02001070 struct acpi_video_device_attrib *attribute;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071
Len Brown4be44fc2005-08-05 00:44:28 -04001072 status =
1073 acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
Aaron Lu91e13aa2013-04-25 02:47:49 +00001074 /* Some device omits _ADR, we skip them instead of fail */
1075 if (ACPI_FAILURE(status))
1076 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077
Aaron Lu91e13aa2013-04-25 02:47:49 +00001078 data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
1079 if (!data)
1080 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081
Aaron Lu91e13aa2013-04-25 02:47:49 +00001082 strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
1083 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
1084 device->driver_data = data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085
Aaron Lu91e13aa2013-04-25 02:47:49 +00001086 data->device_id = device_id;
1087 data->video = video;
1088 data->dev = device;
Linus Torvalds8ab58e82014-07-18 14:32:51 +02001089 INIT_DELAYED_WORK(&data->switch_brightness_work,
1090 acpi_video_switch_brightness);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001091
Aaron Lu91e13aa2013-04-25 02:47:49 +00001092 attribute = acpi_video_get_device_attr(video, device_id);
Rui Zhang82cae992007-01-03 23:40:53 -05001093
Aaron Lue50b9be2015-10-28 15:09:23 +08001094 if (attribute && (attribute->device_id_scheme || device_id_scheme)) {
Aaron Lu91e13aa2013-04-25 02:47:49 +00001095 switch (attribute->display_type) {
1096 case ACPI_VIDEO_DISPLAY_CRT:
1097 data->flags.crt = 1;
1098 break;
1099 case ACPI_VIDEO_DISPLAY_TV:
1100 data->flags.tvout = 1;
1101 break;
1102 case ACPI_VIDEO_DISPLAY_DVI:
1103 data->flags.dvi = 1;
1104 break;
1105 case ACPI_VIDEO_DISPLAY_LCD:
1106 data->flags.lcd = 1;
1107 break;
1108 default:
1109 data->flags.unknown = 1;
1110 break;
1111 }
Felipe Contreras915ea7e2013-08-03 22:12:50 +02001112 if (attribute->bios_can_detect)
Aaron Lu91e13aa2013-04-25 02:47:49 +00001113 data->flags.bios = 1;
1114 } else {
1115 /* Check for legacy IDs */
1116 device_type = acpi_video_get_device_type(video, device_id);
1117 /* Ignore bits 16 and 18-20 */
1118 switch (device_type & 0xffe2ffff) {
Felipe Contreras915ea7e2013-08-03 22:12:50 +02001119 case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR:
1120 data->flags.crt = 1;
1121 break;
1122 case ACPI_VIDEO_DISPLAY_LEGACY_PANEL:
1123 data->flags.lcd = 1;
1124 break;
1125 case ACPI_VIDEO_DISPLAY_LEGACY_TV:
1126 data->flags.tvout = 1;
1127 break;
1128 default:
1129 data->flags.unknown = 1;
Matthew Garrette92a7162010-01-12 14:17:03 -05001130 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001131 }
1132
Aaron Lu91e13aa2013-04-25 02:47:49 +00001133 acpi_video_device_bind(video, data);
1134 acpi_video_device_find_cap(data);
1135
Aaron Lu91e13aa2013-04-25 02:47:49 +00001136 mutex_lock(&video->device_list_lock);
1137 list_add_tail(&data->entry, &video->video_device_list);
1138 mutex_unlock(&video->device_list_lock);
1139
1140 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001141}
1142
1143/*
1144 * Arg:
Felipe Contreras21fcb342013-08-01 18:43:59 -05001145 * video : video bus device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001146 *
1147 * Return:
Felipe Contreras21fcb342013-08-01 18:43:59 -05001148 * none
1149 *
1150 * Enumerate the video device list of the video bus,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001151 * bind the ids with the corresponding video devices
1152 * under the video bus.
Len Brown4be44fc2005-08-05 00:44:28 -04001153 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001154
Len Brown4be44fc2005-08-05 00:44:28 -04001155static void acpi_video_device_rebind(struct acpi_video_bus *video)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001156{
Dmitry Torokhovff102ea2007-11-05 11:43:31 -05001157 struct acpi_video_device *dev;
1158
Dmitry Torokhovbbac81f2007-11-05 11:43:32 -05001159 mutex_lock(&video->device_list_lock);
Dmitry Torokhovff102ea2007-11-05 11:43:31 -05001160
1161 list_for_each_entry(dev, &video->video_device_list, entry)
Len Brown4be44fc2005-08-05 00:44:28 -04001162 acpi_video_device_bind(video, dev);
Dmitry Torokhovff102ea2007-11-05 11:43:31 -05001163
Dmitry Torokhovbbac81f2007-11-05 11:43:32 -05001164 mutex_unlock(&video->device_list_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001165}
1166
1167/*
1168 * Arg:
Felipe Contreras21fcb342013-08-01 18:43:59 -05001169 * video : video bus device
1170 * device : video output device under the video
1171 * bus
Linus Torvalds1da177e2005-04-16 15:20:36 -07001172 *
1173 * Return:
Felipe Contreras21fcb342013-08-01 18:43:59 -05001174 * none
1175 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001176 * Bind the ids with the corresponding video devices
1177 * under the video bus.
Len Brown4be44fc2005-08-05 00:44:28 -04001178 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179
1180static void
Len Brown4be44fc2005-08-05 00:44:28 -04001181acpi_video_device_bind(struct acpi_video_bus *video,
1182 struct acpi_video_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183{
Dmitry Torokhov78eed022007-11-05 11:43:33 -05001184 struct acpi_video_enumerated_device *ids;
Len Brown4be44fc2005-08-05 00:44:28 -04001185 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186
Dmitry Torokhov78eed022007-11-05 11:43:33 -05001187 for (i = 0; i < video->attached_count; i++) {
1188 ids = &video->attached_array[i];
1189 if (device->device_id == (ids->value.int_val & 0xffff)) {
1190 ids->bind_info = device;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001191 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", i));
1192 }
1193 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001194}
1195
Aaron Lu0b8db272014-09-30 14:10:17 +08001196static bool acpi_video_device_in_dod(struct acpi_video_device *device)
1197{
1198 struct acpi_video_bus *video = device->video;
1199 int i;
1200
Aaron Lub4df4632014-12-15 16:01:29 +08001201 /*
1202 * If we have a broken _DOD or we have more than 8 output devices
1203 * under the graphics controller node that we can't proper deal with
1204 * in the operation region code currently, no need to test.
1205 */
1206 if (!video->attached_count || video->child_count > 8)
Aaron Lu0b8db272014-09-30 14:10:17 +08001207 return true;
1208
1209 for (i = 0; i < video->attached_count; i++) {
Aaron Lu35d05652014-12-01 02:09:18 +01001210 if ((video->attached_array[i].value.int_val & 0xfff) ==
1211 (device->device_id & 0xfff))
Aaron Lu0b8db272014-09-30 14:10:17 +08001212 return true;
1213 }
1214
1215 return false;
1216}
1217
Linus Torvalds1da177e2005-04-16 15:20:36 -07001218/*
1219 * Arg:
Felipe Contreras21fcb342013-08-01 18:43:59 -05001220 * video : video bus device
Linus Torvalds1da177e2005-04-16 15:20:36 -07001221 *
1222 * Return:
Felipe Contreras21fcb342013-08-01 18:43:59 -05001223 * < 0 : error
1224 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001225 * Call _DOD to enumerate all devices attached to display adapter
1226 *
Len Brown4be44fc2005-08-05 00:44:28 -04001227 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001228
1229static int acpi_video_device_enumerate(struct acpi_video_bus *video)
1230{
Len Brown4be44fc2005-08-05 00:44:28 -04001231 int status;
1232 int count;
1233 int i;
Dmitry Torokhov78eed022007-11-05 11:43:33 -05001234 struct acpi_video_enumerated_device *active_list;
Len Brown4be44fc2005-08-05 00:44:28 -04001235 struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
1236 union acpi_object *dod = NULL;
1237 union acpi_object *obj;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001238
Patrick Mochel90130262006-05-19 16:54:48 -04001239 status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001240 if (!ACPI_SUCCESS(status)) {
Thomas Renningera6fc6722006-06-26 23:58:43 -04001241 ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
Patrick Mocheld550d982006-06-27 00:41:40 -04001242 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001243 }
1244
Jan Engelhardt50dd0962006-10-01 00:28:50 +02001245 dod = buffer.pointer;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001246 if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
Thomas Renningera6fc6722006-06-26 23:58:43 -04001247 ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001248 status = -EFAULT;
1249 goto out;
1250 }
1251
1252 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found %d video heads in _DOD\n",
Len Brown4be44fc2005-08-05 00:44:28 -04001253 dod->package.count));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001254
Dmitry Torokhov78eed022007-11-05 11:43:33 -05001255 active_list = kcalloc(1 + dod->package.count,
1256 sizeof(struct acpi_video_enumerated_device),
1257 GFP_KERNEL);
1258 if (!active_list) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001259 status = -ENOMEM;
1260 goto out;
1261 }
1262
1263 count = 0;
1264 for (i = 0; i < dod->package.count; i++) {
Jan Engelhardt50dd0962006-10-01 00:28:50 +02001265 obj = &dod->package.elements[i];
Linus Torvalds1da177e2005-04-16 15:20:36 -07001266
1267 if (obj->type != ACPI_TYPE_INTEGER) {
Dmitry Torokhov78eed022007-11-05 11:43:33 -05001268 printk(KERN_ERR PREFIX
1269 "Invalid _DOD data in element %d\n", i);
1270 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001271 }
Dmitry Torokhov78eed022007-11-05 11:43:33 -05001272
1273 active_list[count].value.int_val = obj->integer.value;
1274 active_list[count].bind_info = NULL;
Len Brown4be44fc2005-08-05 00:44:28 -04001275 ACPI_DEBUG_PRINT((ACPI_DB_INFO, "dod element[%d] = %d\n", i,
1276 (int)obj->integer.value));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001277 count++;
1278 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001279
Jesper Juhl6044ec82005-11-07 01:01:32 -08001280 kfree(video->attached_array);
Len Brown4be44fc2005-08-05 00:44:28 -04001281
Dmitry Torokhov78eed022007-11-05 11:43:33 -05001282 video->attached_array = active_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001283 video->attached_count = count;
Dmitry Torokhov78eed022007-11-05 11:43:33 -05001284
Felipe Contreras915ea7e2013-08-03 22:12:50 +02001285out:
Len Brown02438d82006-06-30 03:19:10 -04001286 kfree(buffer.pointer);
Patrick Mocheld550d982006-06-27 00:41:40 -04001287 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001288}
1289
Len Brown4be44fc2005-08-05 00:44:28 -04001290static int
1291acpi_video_get_next_level(struct acpi_video_device *device,
1292 u32 level_current, u32 event)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001293{
Alexey Starikovskiy63f0edf2007-09-03 16:30:08 +04001294 int min, max, min_above, max_below, i, l, delta = 255;
Thomas Tuttlef4715182006-12-19 12:56:14 -08001295 max = max_below = 0;
1296 min = min_above = 255;
Alexey Starikovskiy63f0edf2007-09-03 16:30:08 +04001297 /* Find closest level to level_current */
Zhao Yakui0a3db1ce2009-02-02 11:33:41 +08001298 for (i = 2; i < device->brightness->count; i++) {
Alexey Starikovskiy63f0edf2007-09-03 16:30:08 +04001299 l = device->brightness->levels[i];
1300 if (abs(l - level_current) < abs(delta)) {
1301 delta = l - level_current;
1302 if (!delta)
1303 break;
1304 }
1305 }
1306 /* Ajust level_current to closest available level */
1307 level_current += delta;
Zhao Yakui0a3db1ce2009-02-02 11:33:41 +08001308 for (i = 2; i < device->brightness->count; i++) {
Thomas Tuttlef4715182006-12-19 12:56:14 -08001309 l = device->brightness->levels[i];
1310 if (l < min)
1311 min = l;
1312 if (l > max)
1313 max = l;
1314 if (l < min_above && l > level_current)
1315 min_above = l;
1316 if (l > max_below && l < level_current)
1317 max_below = l;
1318 }
1319
1320 switch (event) {
1321 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS:
1322 return (level_current < max) ? min_above : min;
1323 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS:
1324 return (level_current < max) ? min_above : max;
1325 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS:
1326 return (level_current > min) ? max_below : min;
1327 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS:
1328 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF:
1329 return 0;
1330 default:
1331 return level_current;
1332 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001333}
1334
Linus Torvalds8ab58e82014-07-18 14:32:51 +02001335static void
1336acpi_video_switch_brightness(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001337{
Linus Torvalds8ab58e82014-07-18 14:32:51 +02001338 struct acpi_video_device *device = container_of(to_delayed_work(work),
1339 struct acpi_video_device, switch_brightness_work);
Matthew Wilcox27663c52008-10-10 02:22:59 -04001340 unsigned long long level_current, level_next;
Linus Torvalds8ab58e82014-07-18 14:32:51 +02001341 int event = device->switch_brightness_event;
Zhang Ruic8890f92009-03-18 16:27:08 +08001342 int result = -EINVAL;
1343
Aaron Lufbc9fe12013-10-11 21:27:45 +08001344 /* no warning message if acpi_backlight=vendor or a quirk is used */
Hans de Goede654a1822015-06-09 10:32:25 +02001345 if (!device->backlight)
Linus Torvalds8ab58e82014-07-18 14:32:51 +02001346 return;
Zhang Rui28c32e92009-07-13 10:33:24 +08001347
Julia Jomantaite469778c2008-06-23 22:50:42 +01001348 if (!device->brightness)
Zhang Ruic8890f92009-03-18 16:27:08 +08001349 goto out;
1350
1351 result = acpi_video_device_lcd_get_level_current(device,
Danny Baumanna89803d2013-03-19 16:22:50 +00001352 &level_current,
1353 false);
Zhang Ruic8890f92009-03-18 16:27:08 +08001354 if (result)
1355 goto out;
1356
Linus Torvalds1da177e2005-04-16 15:20:36 -07001357 level_next = acpi_video_get_next_level(device, level_current, event);
Zhang Ruic8890f92009-03-18 16:27:08 +08001358
Zhang Rui24450c72009-03-18 16:27:10 +08001359 result = acpi_video_device_lcd_set_level(device, level_next);
Zhang Ruic8890f92009-03-18 16:27:08 +08001360
Matthew Garrett36342742009-07-14 17:06:03 +01001361 if (!result)
1362 backlight_force_update(device->backlight,
1363 BACKLIGHT_UPDATE_HOTKEY);
1364
Zhang Ruic8890f92009-03-18 16:27:08 +08001365out:
1366 if (result)
1367 printk(KERN_ERR PREFIX "Failed to switch the brightness\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001368}
1369
Matthew Garrette92a7162010-01-12 14:17:03 -05001370int acpi_video_get_edid(struct acpi_device *device, int type, int device_id,
1371 void **edid)
1372{
1373 struct acpi_video_bus *video;
1374 struct acpi_video_device *video_device;
1375 union acpi_object *buffer = NULL;
1376 acpi_status status;
1377 int i, length;
1378
1379 if (!device || !acpi_driver_data(device))
1380 return -EINVAL;
1381
1382 video = acpi_driver_data(device);
1383
1384 for (i = 0; i < video->attached_count; i++) {
1385 video_device = video->attached_array[i].bind_info;
1386 length = 256;
1387
1388 if (!video_device)
1389 continue;
1390
Zhang Rui82069552010-12-06 15:04:24 +08001391 if (!video_device->cap._DDC)
1392 continue;
1393
Matthew Garrette92a7162010-01-12 14:17:03 -05001394 if (type) {
1395 switch (type) {
1396 case ACPI_VIDEO_DISPLAY_CRT:
1397 if (!video_device->flags.crt)
1398 continue;
1399 break;
1400 case ACPI_VIDEO_DISPLAY_TV:
1401 if (!video_device->flags.tvout)
1402 continue;
1403 break;
1404 case ACPI_VIDEO_DISPLAY_DVI:
1405 if (!video_device->flags.dvi)
1406 continue;
1407 break;
1408 case ACPI_VIDEO_DISPLAY_LCD:
1409 if (!video_device->flags.lcd)
1410 continue;
1411 break;
1412 }
1413 } else if (video_device->device_id != device_id) {
1414 continue;
1415 }
1416
1417 status = acpi_video_device_EDID(video_device, &buffer, length);
1418
1419 if (ACPI_FAILURE(status) || !buffer ||
1420 buffer->type != ACPI_TYPE_BUFFER) {
1421 length = 128;
1422 status = acpi_video_device_EDID(video_device, &buffer,
1423 length);
1424 if (ACPI_FAILURE(status) || !buffer ||
1425 buffer->type != ACPI_TYPE_BUFFER) {
1426 continue;
1427 }
1428 }
1429
1430 *edid = buffer->buffer.pointer;
1431 return length;
1432 }
1433
1434 return -ENODEV;
1435}
1436EXPORT_SYMBOL(acpi_video_get_edid);
1437
Linus Torvalds1da177e2005-04-16 15:20:36 -07001438static int
Len Brown4be44fc2005-08-05 00:44:28 -04001439acpi_video_bus_get_devices(struct acpi_video_bus *video,
1440 struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001441{
Igor Murzovfba4e082012-10-13 04:41:25 +04001442 int status = 0;
Dmitry Torokhovff102ea2007-11-05 11:43:31 -05001443 struct acpi_device *dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001444
Igor Murzovfba4e082012-10-13 04:41:25 +04001445 /*
1446 * There are systems where video module known to work fine regardless
1447 * of broken _DOD and ignoring returned value here doesn't cause
1448 * any issues later.
1449 */
1450 acpi_video_device_enumerate(video);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001451
Dmitry Torokhovff102ea2007-11-05 11:43:31 -05001452 list_for_each_entry(dev, &device->children, node) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001453
1454 status = acpi_video_bus_get_one_device(dev, video);
Igor Murzovea9f8852012-03-30 21:32:08 +04001455 if (status) {
Aaron Lu91e13aa2013-04-25 02:47:49 +00001456 dev_err(&dev->dev, "Can't attach device\n");
1457 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001458 }
Aaron Lub4df4632014-12-15 16:01:29 +08001459 video->child_count++;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001460 }
Patrick Mocheld550d982006-06-27 00:41:40 -04001461 return status;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001462}
1463
Linus Torvalds1da177e2005-04-16 15:20:36 -07001464/* acpi_video interface */
1465
Aaron Luefaa14c2013-07-16 13:08:05 +08001466/*
1467 * Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
1468 * preform any automatic brightness change on receiving a notification.
1469 */
Len Brown4be44fc2005-08-05 00:44:28 -04001470static int acpi_video_bus_start_devices(struct acpi_video_bus *video)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001471{
Aaron Luefaa14c2013-07-16 13:08:05 +08001472 return acpi_video_bus_DOS(video, 0,
Aaron Lufbc9fe12013-10-11 21:27:45 +08001473 acpi_osi_is_win8() ? 1 : 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001474}
1475
Len Brown4be44fc2005-08-05 00:44:28 -04001476static int acpi_video_bus_stop_devices(struct acpi_video_bus *video)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001477{
Aaron Luefaa14c2013-07-16 13:08:05 +08001478 return acpi_video_bus_DOS(video, 0,
Aaron Lufbc9fe12013-10-11 21:27:45 +08001479 acpi_osi_is_win8() ? 0 : 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001480}
1481
Bjorn Helgaas70155582009-04-07 15:37:11 +00001482static void acpi_video_bus_notify(struct acpi_device *device, u32 event)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001483{
Bjorn Helgaas70155582009-04-07 15:37:11 +00001484 struct acpi_video_bus *video = acpi_driver_data(device);
Luming Yue9dab192007-08-20 18:23:53 +08001485 struct input_dev *input;
Matthew Garrett17c452f2009-12-11 17:40:46 -05001486 int keycode = 0;
Luming Yue9dab192007-08-20 18:23:53 +08001487
Aaron Lu67b662e2013-10-11 21:27:44 +08001488 if (!video || !video->input)
Patrick Mocheld550d982006-06-27 00:41:40 -04001489 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001490
Luming Yue9dab192007-08-20 18:23:53 +08001491 input = video->input;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001492
1493 switch (event) {
Julius Volz98fb8fe2007-02-20 16:38:40 +01001494 case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001495 * most likely via hotkey. */
Luca Tettamanti8a37c652012-08-02 15:30:27 +02001496 keycode = KEY_SWITCHVIDEOMODE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001497 break;
1498
Julius Volz98fb8fe2007-02-20 16:38:40 +01001499 case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video
Linus Torvalds1da177e2005-04-16 15:20:36 -07001500 * connector. */
1501 acpi_video_device_enumerate(video);
1502 acpi_video_device_rebind(video);
Luming Yue9dab192007-08-20 18:23:53 +08001503 keycode = KEY_SWITCHVIDEOMODE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001504 break;
1505
Len Brown4be44fc2005-08-05 00:44:28 -04001506 case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */
Luming Yue9dab192007-08-20 18:23:53 +08001507 keycode = KEY_SWITCHVIDEOMODE;
1508 break;
Len Brown4be44fc2005-08-05 00:44:28 -04001509 case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */
Luming Yue9dab192007-08-20 18:23:53 +08001510 keycode = KEY_VIDEO_NEXT;
1511 break;
Len Brown4be44fc2005-08-05 00:44:28 -04001512 case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */
Luming Yue9dab192007-08-20 18:23:53 +08001513 keycode = KEY_VIDEO_PREV;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001514 break;
1515
1516 default:
1517 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -04001518 "Unsupported event [0x%x]\n", event));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001519 break;
1520 }
1521
Luca Tettamanti8a37c652012-08-02 15:30:27 +02001522 if (acpi_notifier_call_chain(device, event, 0))
1523 /* Something vetoed the keypress. */
1524 keycode = 0;
Matthew Garrett17c452f2009-12-11 17:40:46 -05001525
Hans de Goede05bc59a2015-12-22 19:09:51 +01001526 if (keycode && (report_key_events & REPORT_OUTPUT_KEY_EVENTS)) {
Matthew Garrett17c452f2009-12-11 17:40:46 -05001527 input_report_key(input, keycode, 1);
1528 input_sync(input);
1529 input_report_key(input, keycode, 0);
1530 input_sync(input);
1531 }
Luming Yue9dab192007-08-20 18:23:53 +08001532
Patrick Mocheld550d982006-06-27 00:41:40 -04001533 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001534}
1535
Linus Torvalds8ab58e82014-07-18 14:32:51 +02001536static void brightness_switch_event(struct acpi_video_device *video_device,
1537 u32 event)
1538{
1539 if (!brightness_switch_enabled)
1540 return;
1541
1542 video_device->switch_brightness_event = event;
1543 schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10);
1544}
1545
Len Brown4be44fc2005-08-05 00:44:28 -04001546static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001547{
Jan Engelhardt50dd0962006-10-01 00:28:50 +02001548 struct acpi_video_device *video_device = data;
Len Brown4be44fc2005-08-05 00:44:28 -04001549 struct acpi_device *device = NULL;
Luming Yue9dab192007-08-20 18:23:53 +08001550 struct acpi_video_bus *bus;
1551 struct input_dev *input;
Matthew Garrett17c452f2009-12-11 17:40:46 -05001552 int keycode = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001553
Linus Torvalds1da177e2005-04-16 15:20:36 -07001554 if (!video_device)
Patrick Mocheld550d982006-06-27 00:41:40 -04001555 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001556
Patrick Mochele6afa0d2006-05-19 16:54:40 -04001557 device = video_device->dev;
Luming Yue9dab192007-08-20 18:23:53 +08001558 bus = video_device->video;
1559 input = bus->input;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001560
1561 switch (event) {
Len Brown4be44fc2005-08-05 00:44:28 -04001562 case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */
Linus Torvalds8ab58e82014-07-18 14:32:51 +02001563 brightness_switch_event(video_device, event);
Luming Yue9dab192007-08-20 18:23:53 +08001564 keycode = KEY_BRIGHTNESS_CYCLE;
1565 break;
Len Brown4be44fc2005-08-05 00:44:28 -04001566 case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */
Linus Torvalds8ab58e82014-07-18 14:32:51 +02001567 brightness_switch_event(video_device, event);
Luming Yue9dab192007-08-20 18:23:53 +08001568 keycode = KEY_BRIGHTNESSUP;
1569 break;
Len Brown4be44fc2005-08-05 00:44:28 -04001570 case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */
Linus Torvalds8ab58e82014-07-18 14:32:51 +02001571 brightness_switch_event(video_device, event);
Luming Yue9dab192007-08-20 18:23:53 +08001572 keycode = KEY_BRIGHTNESSDOWN;
1573 break;
Justin P. Mattock70f23fd2011-05-10 10:16:21 +02001574 case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */
Linus Torvalds8ab58e82014-07-18 14:32:51 +02001575 brightness_switch_event(video_device, event);
Luming Yue9dab192007-08-20 18:23:53 +08001576 keycode = KEY_BRIGHTNESS_ZERO;
1577 break;
Len Brown4be44fc2005-08-05 00:44:28 -04001578 case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */
Linus Torvalds8ab58e82014-07-18 14:32:51 +02001579 brightness_switch_event(video_device, event);
Luming Yue9dab192007-08-20 18:23:53 +08001580 keycode = KEY_DISPLAY_OFF;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001581 break;
1582 default:
1583 ACPI_DEBUG_PRINT((ACPI_DB_INFO,
Len Brown4be44fc2005-08-05 00:44:28 -04001584 "Unsupported event [0x%x]\n", event));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001585 break;
1586 }
Luming Yue9dab192007-08-20 18:23:53 +08001587
Zhang Rui7761f632008-01-25 14:48:12 +08001588 acpi_notifier_call_chain(device, event, 0);
Matthew Garrett17c452f2009-12-11 17:40:46 -05001589
Hans de Goede05bc59a2015-12-22 19:09:51 +01001590 if (keycode && (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS)) {
Matthew Garrett17c452f2009-12-11 17:40:46 -05001591 input_report_key(input, keycode, 1);
1592 input_sync(input);
1593 input_report_key(input, keycode, 0);
1594 input_sync(input);
1595 }
Luming Yue9dab192007-08-20 18:23:53 +08001596
Patrick Mocheld550d982006-06-27 00:41:40 -04001597 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001598}
1599
Rafael J. Wysockiac7729d2010-04-05 01:43:51 +02001600static int acpi_video_resume(struct notifier_block *nb,
1601 unsigned long val, void *ign)
Matthew Garrett863c1492008-02-04 23:31:24 -08001602{
1603 struct acpi_video_bus *video;
1604 struct acpi_video_device *video_device;
1605 int i;
1606
Rafael J. Wysockiac7729d2010-04-05 01:43:51 +02001607 switch (val) {
1608 case PM_HIBERNATION_PREPARE:
1609 case PM_SUSPEND_PREPARE:
1610 case PM_RESTORE_PREPARE:
1611 return NOTIFY_DONE;
1612 }
Matthew Garrett863c1492008-02-04 23:31:24 -08001613
Rafael J. Wysockiac7729d2010-04-05 01:43:51 +02001614 video = container_of(nb, struct acpi_video_bus, pm_nb);
1615
1616 dev_info(&video->device->dev, "Restoring backlight state\n");
Matthew Garrett863c1492008-02-04 23:31:24 -08001617
1618 for (i = 0; i < video->attached_count; i++) {
1619 video_device = video->attached_array[i].bind_info;
Hans de Goede654a1822015-06-09 10:32:25 +02001620 if (video_device && video_device->brightness)
1621 acpi_video_device_lcd_set_level(video_device,
1622 video_device->brightness->curr);
Matthew Garrett863c1492008-02-04 23:31:24 -08001623 }
Rafael J. Wysockiac7729d2010-04-05 01:43:51 +02001624
1625 return NOTIFY_OK;
Matthew Garrett863c1492008-02-04 23:31:24 -08001626}
1627
Zhang Ruic504f8c2009-12-30 15:59:23 +08001628static acpi_status
1629acpi_video_bus_match(acpi_handle handle, u32 level, void *context,
1630 void **return_value)
1631{
1632 struct acpi_device *device = context;
1633 struct acpi_device *sibling;
1634 int result;
1635
1636 if (handle == device->handle)
1637 return AE_CTRL_TERMINATE;
1638
1639 result = acpi_bus_get_device(handle, &sibling);
1640 if (result)
1641 return AE_OK;
1642
1643 if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME))
1644 return AE_ALREADY_EXISTS;
1645
1646 return AE_OK;
1647}
1648
Aaron Lu67b662e2013-10-11 21:27:44 +08001649static void acpi_video_dev_register_backlight(struct acpi_video_device *device)
1650{
Hans de Goede99678ed2014-05-15 13:22:33 +02001651 struct backlight_properties props;
1652 struct pci_dev *pdev;
1653 acpi_handle acpi_parent;
1654 struct device *parent = NULL;
1655 int result;
1656 static int count;
1657 char *name;
Aaron Lu67b662e2013-10-11 21:27:44 +08001658
Hans de Goede99678ed2014-05-15 13:22:33 +02001659 result = acpi_video_init_brightness(device);
1660 if (result)
1661 return;
Hans de Goede654a1822015-06-09 10:32:25 +02001662
1663 if (disable_backlight_sysfs_if > 0)
1664 return;
1665
Hans de Goede99678ed2014-05-15 13:22:33 +02001666 name = kasprintf(GFP_KERNEL, "acpi_video%d", count);
1667 if (!name)
1668 return;
1669 count++;
Aaron Lu67b662e2013-10-11 21:27:44 +08001670
Hans de Goede99678ed2014-05-15 13:22:33 +02001671 acpi_get_parent(device->dev->handle, &acpi_parent);
Aaron Lu67b662e2013-10-11 21:27:44 +08001672
Hans de Goede99678ed2014-05-15 13:22:33 +02001673 pdev = acpi_get_pci_dev(acpi_parent);
1674 if (pdev) {
1675 parent = &pdev->dev;
1676 pci_dev_put(pdev);
Aaron Lu67b662e2013-10-11 21:27:44 +08001677 }
Hans de Goede99678ed2014-05-15 13:22:33 +02001678
1679 memset(&props, 0, sizeof(struct backlight_properties));
1680 props.type = BACKLIGHT_FIRMWARE;
1681 props.max_brightness = device->brightness->count - 3;
1682 device->backlight = backlight_device_register(name,
1683 parent,
1684 device,
1685 &acpi_backlight_ops,
1686 &props);
1687 kfree(name);
Hans de Goede654a1822015-06-09 10:32:25 +02001688 if (IS_ERR(device->backlight)) {
1689 device->backlight = NULL;
Hans de Goede99678ed2014-05-15 13:22:33 +02001690 return;
Hans de Goede654a1822015-06-09 10:32:25 +02001691 }
Hans de Goede99678ed2014-05-15 13:22:33 +02001692
1693 /*
1694 * Save current brightness level in case we have to restore it
1695 * before acpi_video_device_lcd_set_level() is called next time.
1696 */
1697 device->backlight->props.brightness =
1698 acpi_video_get_brightness(device->backlight);
1699
1700 device->cooling_dev = thermal_cooling_device_register("LCD",
1701 device->dev, &video_cooling_ops);
1702 if (IS_ERR(device->cooling_dev)) {
1703 /*
1704 * Set cooling_dev to NULL so we don't crash trying to free it.
1705 * Also, why the hell we are returning early and not attempt to
1706 * register video output if cooling device registration failed?
1707 * -- dtor
1708 */
1709 device->cooling_dev = NULL;
1710 return;
1711 }
1712
1713 dev_info(&device->dev->dev, "registered as cooling_device%d\n",
1714 device->cooling_dev->id);
1715 result = sysfs_create_link(&device->dev->dev.kobj,
1716 &device->cooling_dev->device.kobj,
1717 "thermal_cooling");
1718 if (result)
1719 printk(KERN_ERR PREFIX "Create sysfs link\n");
1720 result = sysfs_create_link(&device->cooling_dev->device.kobj,
1721 &device->dev->dev.kobj, "device");
1722 if (result)
1723 printk(KERN_ERR PREFIX "Create sysfs link\n");
Aaron Lu67b662e2013-10-11 21:27:44 +08001724}
1725
Aaron Ludce4ec22014-10-28 14:35:59 +08001726static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video)
1727{
1728 struct acpi_video_device *dev;
1729 union acpi_object *levels;
1730
1731 mutex_lock(&video->device_list_lock);
1732 list_for_each_entry(dev, &video->video_device_list, entry) {
1733 if (!acpi_video_device_lcd_query_levels(dev, &levels))
1734 kfree(levels);
1735 }
1736 mutex_unlock(&video->device_list_lock);
1737}
1738
Aaron Lue50b9be2015-10-28 15:09:23 +08001739static bool acpi_video_should_register_backlight(struct acpi_video_device *dev)
1740{
1741 /*
1742 * Do not create backlight device for video output
1743 * device that is not in the enumerated list.
1744 */
1745 if (!acpi_video_device_in_dod(dev)) {
1746 dev_dbg(&dev->dev->dev, "not in _DOD list, ignore\n");
1747 return false;
1748 }
1749
1750 if (only_lcd)
1751 return dev->flags.lcd;
1752 return true;
1753}
1754
Aaron Lu67b662e2013-10-11 21:27:44 +08001755static int acpi_video_bus_register_backlight(struct acpi_video_bus *video)
1756{
1757 struct acpi_video_device *dev;
1758
Hans de Goede53a92ba2014-05-21 15:39:55 +02001759 if (video->backlight_registered)
1760 return 0;
1761
Aaron Ludce4ec22014-10-28 14:35:59 +08001762 acpi_video_run_bcl_for_osi(video);
1763
Hans de Goede3bd6bce2015-06-16 16:27:51 +02001764 if (acpi_video_get_backlight_type() != acpi_backlight_video)
Hans de Goede99678ed2014-05-15 13:22:33 +02001765 return 0;
1766
Aaron Lu67b662e2013-10-11 21:27:44 +08001767 mutex_lock(&video->device_list_lock);
Aaron Lue50b9be2015-10-28 15:09:23 +08001768 list_for_each_entry(dev, &video->video_device_list, entry) {
1769 if (acpi_video_should_register_backlight(dev))
1770 acpi_video_dev_register_backlight(dev);
1771 }
Aaron Lu67b662e2013-10-11 21:27:44 +08001772 mutex_unlock(&video->device_list_lock);
1773
Hans de Goede99678ed2014-05-15 13:22:33 +02001774 video->backlight_registered = true;
1775
Aaron Lu67b662e2013-10-11 21:27:44 +08001776 video->pm_nb.notifier_call = acpi_video_resume;
1777 video->pm_nb.priority = 0;
1778 return register_pm_notifier(&video->pm_nb);
1779}
1780
1781static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device)
1782{
1783 if (device->backlight) {
1784 backlight_device_unregister(device->backlight);
1785 device->backlight = NULL;
1786 }
1787 if (device->brightness) {
1788 kfree(device->brightness->levels);
1789 kfree(device->brightness);
1790 device->brightness = NULL;
1791 }
1792 if (device->cooling_dev) {
1793 sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling");
1794 sysfs_remove_link(&device->cooling_dev->device.kobj, "device");
1795 thermal_cooling_device_unregister(device->cooling_dev);
1796 device->cooling_dev = NULL;
1797 }
1798}
1799
1800static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video)
1801{
1802 struct acpi_video_device *dev;
Hans de Goede99678ed2014-05-15 13:22:33 +02001803 int error;
1804
1805 if (!video->backlight_registered)
1806 return 0;
1807
1808 error = unregister_pm_notifier(&video->pm_nb);
Aaron Lu67b662e2013-10-11 21:27:44 +08001809
1810 mutex_lock(&video->device_list_lock);
1811 list_for_each_entry(dev, &video->video_device_list, entry)
1812 acpi_video_dev_unregister_backlight(dev);
1813 mutex_unlock(&video->device_list_lock);
1814
Hans de Goede99678ed2014-05-15 13:22:33 +02001815 video->backlight_registered = false;
1816
Aaron Lu67b662e2013-10-11 21:27:44 +08001817 return error;
1818}
1819
1820static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device)
1821{
1822 acpi_status status;
1823 struct acpi_device *adev = device->dev;
1824
1825 status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
1826 acpi_video_device_notify, device);
1827 if (ACPI_FAILURE(status))
1828 dev_err(&adev->dev, "Error installing notify handler\n");
1829 else
1830 device->flags.notify = 1;
1831}
1832
1833static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video)
1834{
1835 struct input_dev *input;
1836 struct acpi_video_device *dev;
1837 int error;
1838
1839 video->input = input = input_allocate_device();
1840 if (!input) {
1841 error = -ENOMEM;
1842 goto out;
1843 }
1844
1845 error = acpi_video_bus_start_devices(video);
1846 if (error)
1847 goto err_free_input;
1848
1849 snprintf(video->phys, sizeof(video->phys),
1850 "%s/video/input0", acpi_device_hid(video->device));
1851
1852 input->name = acpi_device_name(video->device);
1853 input->phys = video->phys;
1854 input->id.bustype = BUS_HOST;
1855 input->id.product = 0x06;
1856 input->dev.parent = &video->device->dev;
1857 input->evbit[0] = BIT(EV_KEY);
1858 set_bit(KEY_SWITCHVIDEOMODE, input->keybit);
1859 set_bit(KEY_VIDEO_NEXT, input->keybit);
1860 set_bit(KEY_VIDEO_PREV, input->keybit);
1861 set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit);
1862 set_bit(KEY_BRIGHTNESSUP, input->keybit);
1863 set_bit(KEY_BRIGHTNESSDOWN, input->keybit);
1864 set_bit(KEY_BRIGHTNESS_ZERO, input->keybit);
1865 set_bit(KEY_DISPLAY_OFF, input->keybit);
1866
1867 error = input_register_device(input);
1868 if (error)
1869 goto err_stop_dev;
1870
1871 mutex_lock(&video->device_list_lock);
1872 list_for_each_entry(dev, &video->video_device_list, entry)
1873 acpi_video_dev_add_notify_handler(dev);
1874 mutex_unlock(&video->device_list_lock);
1875
1876 return 0;
1877
1878err_stop_dev:
1879 acpi_video_bus_stop_devices(video);
1880err_free_input:
1881 input_free_device(input);
1882 video->input = NULL;
1883out:
1884 return error;
1885}
1886
1887static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev)
1888{
1889 if (dev->flags.notify) {
1890 acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY,
1891 acpi_video_device_notify);
1892 dev->flags.notify = 0;
1893 }
1894}
1895
1896static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video)
1897{
1898 struct acpi_video_device *dev;
1899
1900 mutex_lock(&video->device_list_lock);
1901 list_for_each_entry(dev, &video->video_device_list, entry)
1902 acpi_video_dev_remove_notify_handler(dev);
1903 mutex_unlock(&video->device_list_lock);
1904
1905 acpi_video_bus_stop_devices(video);
1906 input_unregister_device(video->input);
1907 video->input = NULL;
1908}
1909
1910static int acpi_video_bus_put_devices(struct acpi_video_bus *video)
1911{
1912 struct acpi_video_device *dev, *next;
1913
1914 mutex_lock(&video->device_list_lock);
1915 list_for_each_entry_safe(dev, next, &video->video_device_list, entry) {
1916 list_del(&dev->entry);
1917 kfree(dev);
1918 }
1919 mutex_unlock(&video->device_list_lock);
1920
1921 return 0;
1922}
1923
Rafael J. Wysockiac7729d2010-04-05 01:43:51 +02001924static int instance;
1925
Len Brown4be44fc2005-08-05 00:44:28 -04001926static int acpi_video_bus_add(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001927{
Dmitry Torokhovf51e8392007-11-05 11:43:30 -05001928 struct acpi_video_bus *video;
Dmitry Torokhovf51e8392007-11-05 11:43:30 -05001929 int error;
Zhang Ruic504f8c2009-12-30 15:59:23 +08001930 acpi_status status;
1931
1932 status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
1933 device->parent->handle, 1,
1934 acpi_video_bus_match, NULL,
1935 device, NULL);
1936 if (status == AE_ALREADY_EXISTS) {
1937 printk(KERN_WARNING FW_BUG
1938 "Duplicate ACPI video bus devices for the"
1939 " same VGA controller, please try module "
1940 "parameter \"video.allow_duplicates=1\""
1941 "if the current driver doesn't work.\n");
1942 if (!allow_duplicates)
1943 return -ENODEV;
1944 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001945
Burman Yan36bcbec2006-12-19 12:56:11 -08001946 video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001947 if (!video)
Patrick Mocheld550d982006-06-27 00:41:40 -04001948 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001949
Zhang Ruie6d9da12007-08-25 02:23:31 -04001950 /* a hack to fix the duplicate name "VID" problem on T61 */
1951 if (!strcmp(device->pnp.bus_id, "VID")) {
1952 if (instance)
1953 device->pnp.bus_id[3] = '0' + instance;
Felipe Contreras915ea7e2013-08-03 22:12:50 +02001954 instance++;
Zhang Ruie6d9da12007-08-25 02:23:31 -04001955 }
Zhao Yakuif3b39f12009-02-02 22:55:01 -05001956 /* a hack to fix the duplicate name "VGA" problem on Pa 3553 */
1957 if (!strcmp(device->pnp.bus_id, "VGA")) {
1958 if (instance)
1959 device->pnp.bus_id[3] = '0' + instance;
1960 instance++;
1961 }
Zhang Ruie6d9da12007-08-25 02:23:31 -04001962
Patrick Mochele6afa0d2006-05-19 16:54:40 -04001963 video->device = device;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001964 strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
1965 strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
Pavel Machekdb89b4f2008-09-22 14:37:34 -07001966 device->driver_data = video;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001967
1968 acpi_video_bus_find_cap(video);
Dmitry Torokhovf51e8392007-11-05 11:43:30 -05001969 error = acpi_video_bus_check(video);
1970 if (error)
1971 goto err_free_video;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001972
Dmitry Torokhovbbac81f2007-11-05 11:43:32 -05001973 mutex_init(&video->device_list_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001974 INIT_LIST_HEAD(&video->video_device_list);
1975
Igor Murzovea9f8852012-03-30 21:32:08 +04001976 error = acpi_video_bus_get_devices(video, device);
1977 if (error)
Aaron Lu91e13aa2013-04-25 02:47:49 +00001978 goto err_put_video;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001979
Linus Torvalds1da177e2005-04-16 15:20:36 -07001980 printk(KERN_INFO PREFIX "%s [%s] (multi-head: %s rom: %s post: %s)\n",
Len Brown4be44fc2005-08-05 00:44:28 -04001981 ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device),
1982 video->flags.multihead ? "yes" : "no",
1983 video->flags.rom ? "yes" : "no",
1984 video->flags.post ? "yes" : "no");
Aaron Lu67b662e2013-10-11 21:27:44 +08001985 mutex_lock(&video_list_lock);
1986 list_add_tail(&video->entry, &video_bus_head);
1987 mutex_unlock(&video_list_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001988
Aaron Lu67b662e2013-10-11 21:27:44 +08001989 acpi_video_bus_register_backlight(video);
1990 acpi_video_bus_add_notify_handler(video);
Rafael J. Wysockiac7729d2010-04-05 01:43:51 +02001991
Dmitry Torokhovf51e8392007-11-05 11:43:30 -05001992 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001993
Aaron Lu67b662e2013-10-11 21:27:44 +08001994err_put_video:
Dmitry Torokhovf51e8392007-11-05 11:43:30 -05001995 acpi_video_bus_put_devices(video);
1996 kfree(video->attached_array);
Aaron Lu67b662e2013-10-11 21:27:44 +08001997err_free_video:
Dmitry Torokhovf51e8392007-11-05 11:43:30 -05001998 kfree(video);
Pavel Machekdb89b4f2008-09-22 14:37:34 -07001999 device->driver_data = NULL;
Dmitry Torokhovf51e8392007-11-05 11:43:30 -05002000
2001 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002002}
2003
Rafael J. Wysocki51fac832013-01-24 00:24:48 +01002004static int acpi_video_bus_remove(struct acpi_device *device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002005{
Len Brown4be44fc2005-08-05 00:44:28 -04002006 struct acpi_video_bus *video = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002007
Linus Torvalds1da177e2005-04-16 15:20:36 -07002008
2009 if (!device || !acpi_driver_data(device))
Patrick Mocheld550d982006-06-27 00:41:40 -04002010 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002011
Jan Engelhardt50dd0962006-10-01 00:28:50 +02002012 video = acpi_driver_data(device);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002013
Aaron Lu67b662e2013-10-11 21:27:44 +08002014 acpi_video_bus_remove_notify_handler(video);
2015 acpi_video_bus_unregister_backlight(video);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002016 acpi_video_bus_put_devices(video);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002017
Aaron Lu67b662e2013-10-11 21:27:44 +08002018 mutex_lock(&video_list_lock);
2019 list_del(&video->entry);
2020 mutex_unlock(&video_list_lock);
2021
Jesper Juhl6044ec82005-11-07 01:01:32 -08002022 kfree(video->attached_array);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002023 kfree(video);
2024
Patrick Mocheld550d982006-06-27 00:41:40 -04002025 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002026}
2027
Alan Coxc6996bd2012-04-25 14:33:48 +01002028static int __init is_i740(struct pci_dev *dev)
2029{
2030 if (dev->device == 0x00D1)
2031 return 1;
2032 if (dev->device == 0x7000)
2033 return 1;
2034 return 0;
2035}
2036
Matthew Garrett74a365b2009-03-19 21:35:39 +00002037static int __init intel_opregion_present(void)
2038{
Alan Coxc6996bd2012-04-25 14:33:48 +01002039 int opregion = 0;
Matthew Garrett74a365b2009-03-19 21:35:39 +00002040 struct pci_dev *dev = NULL;
2041 u32 address;
2042
2043 for_each_pci_dev(dev) {
2044 if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
2045 continue;
2046 if (dev->vendor != PCI_VENDOR_ID_INTEL)
2047 continue;
Alan Coxc6996bd2012-04-25 14:33:48 +01002048 /* We don't want to poke around undefined i740 registers */
2049 if (is_i740(dev))
2050 continue;
Matthew Garrett74a365b2009-03-19 21:35:39 +00002051 pci_read_config_dword(dev, 0xfc, &address);
2052 if (!address)
2053 continue;
Alan Coxc6996bd2012-04-25 14:33:48 +01002054 opregion = 1;
Matthew Garrett74a365b2009-03-19 21:35:39 +00002055 }
Alan Coxc6996bd2012-04-25 14:33:48 +01002056 return opregion;
Matthew Garrett74a365b2009-03-19 21:35:39 +00002057}
2058
Rafael J. Wysocki8e5c2b72013-07-25 21:43:39 +02002059int acpi_video_register(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002060{
Hans de Goede2a8b18e2015-06-16 16:27:54 +02002061 int ret = 0;
Chris Wilson28d63402015-03-01 10:41:38 +00002062
Hans de Goede970530c2016-01-14 09:41:45 +01002063 mutex_lock(&register_count_mutex);
2064 if (register_count) {
Zhao Yakui86e437f2009-06-16 11:23:13 +08002065 /*
Rafael J. Wysocki8e5c2b72013-07-25 21:43:39 +02002066 * if the function of acpi_video_register is already called,
2067 * don't register the acpi_vide_bus again and return no error.
Zhao Yakui86e437f2009-06-16 11:23:13 +08002068 */
Hans de Goede2a8b18e2015-06-16 16:27:54 +02002069 goto leave;
Zhao Yakui86e437f2009-06-16 11:23:13 +08002070 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002071
Hans de Goede7ee33ba2015-06-16 16:27:53 +02002072 dmi_check_system(video_dmi_table);
2073
Chris Wilson28d63402015-03-01 10:41:38 +00002074 ret = acpi_bus_register_driver(&acpi_video_bus);
2075 if (ret)
Hans de Goede2a8b18e2015-06-16 16:27:54 +02002076 goto leave;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002077
Zhao Yakui86e437f2009-06-16 11:23:13 +08002078 /*
2079 * When the acpi_video_bus is loaded successfully, increase
2080 * the counter reference.
2081 */
Hans de Goede970530c2016-01-14 09:41:45 +01002082 register_count = 1;
Zhao Yakui86e437f2009-06-16 11:23:13 +08002083
Hans de Goede2a8b18e2015-06-16 16:27:54 +02002084leave:
Hans de Goede970530c2016-01-14 09:41:45 +01002085 mutex_unlock(&register_count_mutex);
Hans de Goede2a8b18e2015-06-16 16:27:54 +02002086 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002087}
Rafael J. Wysocki8e5c2b72013-07-25 21:43:39 +02002088EXPORT_SYMBOL(acpi_video_register);
Matthew Garrett74a365b2009-03-19 21:35:39 +00002089
Zhao Yakui86e437f2009-06-16 11:23:13 +08002090void acpi_video_unregister(void)
2091{
Hans de Goede970530c2016-01-14 09:41:45 +01002092 mutex_lock(&register_count_mutex);
2093 if (register_count) {
Hans de Goede2a8b18e2015-06-16 16:27:54 +02002094 acpi_bus_unregister_driver(&acpi_video_bus);
Hans de Goede970530c2016-01-14 09:41:45 +01002095 register_count = 0;
Zhao Yakui86e437f2009-06-16 11:23:13 +08002096 }
Hans de Goede970530c2016-01-14 09:41:45 +01002097 mutex_unlock(&register_count_mutex);
Zhao Yakui86e437f2009-06-16 11:23:13 +08002098}
2099EXPORT_SYMBOL(acpi_video_unregister);
2100
Hans de Goede1b7f37e2014-05-17 10:48:01 +02002101void acpi_video_unregister_backlight(void)
2102{
2103 struct acpi_video_bus *video;
2104
Hans de Goede970530c2016-01-14 09:41:45 +01002105 mutex_lock(&register_count_mutex);
2106 if (register_count) {
Hans de Goede2a8b18e2015-06-16 16:27:54 +02002107 mutex_lock(&video_list_lock);
2108 list_for_each_entry(video, &video_bus_head, entry)
2109 acpi_video_bus_unregister_backlight(video);
2110 mutex_unlock(&video_list_lock);
2111 }
Hans de Goede970530c2016-01-14 09:41:45 +01002112 mutex_unlock(&register_count_mutex);
Hans de Goede1b7f37e2014-05-17 10:48:01 +02002113}
Hans de Goede1b7f37e2014-05-17 10:48:01 +02002114
Hans de Goede90b066b2015-12-22 19:09:48 +01002115bool acpi_video_handles_brightness_key_presses(void)
2116{
2117 bool have_video_busses;
2118
2119 mutex_lock(&video_list_lock);
2120 have_video_busses = !list_empty(&video_bus_head);
2121 mutex_unlock(&video_list_lock);
2122
Hans de Goede05bc59a2015-12-22 19:09:51 +01002123 return have_video_busses &&
2124 (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS);
Hans de Goede90b066b2015-12-22 19:09:48 +01002125}
2126EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses);
2127
Matthew Garrett74a365b2009-03-19 21:35:39 +00002128/*
2129 * This is kind of nasty. Hardware using Intel chipsets may require
2130 * the video opregion code to be run first in order to initialise
2131 * state before any ACPI video calls are made. To handle this we defer
2132 * registration of the video class until the opregion code has run.
2133 */
2134
2135static int __init acpi_video_init(void)
2136{
Chris Wilson6e17cb12015-03-01 10:41:37 +00002137 /*
2138 * Let the module load even if ACPI is disabled (e.g. due to
2139 * a broken BIOS) so that i915.ko can still be loaded on such
2140 * old systems without an AcpiOpRegion.
2141 *
2142 * acpi_video_register() will report -ENODEV later as well due
2143 * to acpi_disabled when i915.ko tries to register itself afterwards.
2144 */
2145 if (acpi_disabled)
2146 return 0;
2147
Matthew Garrett74a365b2009-03-19 21:35:39 +00002148 if (intel_opregion_present())
2149 return 0;
2150
2151 return acpi_video_register();
2152}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002153
Zhao Yakui86e437f2009-06-16 11:23:13 +08002154static void __exit acpi_video_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002155{
Hans de Goede93a291d2015-06-16 16:27:52 +02002156 acpi_video_detect_exit();
Zhao Yakui86e437f2009-06-16 11:23:13 +08002157 acpi_video_unregister();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002158
Patrick Mocheld550d982006-06-27 00:41:40 -04002159 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002160}
Linus Torvalds1da177e2005-04-16 15:20:36 -07002161
2162module_init(acpi_video_init);
2163module_exit(acpi_video_exit);