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2303 lines
59 KiB
2303 lines
59 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* video.c - ACPI Video Driver |
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* |
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* Copyright (C) 2004 Luming Yu <[email protected]> |
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* Copyright (C) 2004 Bruno Ducrot <[email protected]> |
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* Copyright (C) 2006 Thomas Tuttle <[email protected]> |
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*/ |
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|
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#define pr_fmt(fmt) "ACPI: video: " fmt |
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|
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/types.h> |
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#include <linux/list.h> |
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#include <linux/mutex.h> |
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#include <linux/input.h> |
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#include <linux/backlight.h> |
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#include <linux/thermal.h> |
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#include <linux/sort.h> |
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#include <linux/pci.h> |
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#include <linux/pci_ids.h> |
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#include <linux/slab.h> |
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#include <linux/dmi.h> |
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#include <linux/suspend.h> |
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#include <linux/acpi.h> |
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#include <acpi/video.h> |
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#include <linux/uaccess.h> |
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|
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#define ACPI_VIDEO_BUS_NAME "Video Bus" |
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#define ACPI_VIDEO_DEVICE_NAME "Video Device" |
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#define MAX_NAME_LEN 20 |
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MODULE_AUTHOR("Bruno Ducrot"); |
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MODULE_DESCRIPTION("ACPI Video Driver"); |
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MODULE_LICENSE("GPL"); |
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static bool brightness_switch_enabled = true; |
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module_param(brightness_switch_enabled, bool, 0644); |
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|
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/* |
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* By default, we don't allow duplicate ACPI video bus devices |
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* under the same VGA controller |
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*/ |
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static bool allow_duplicates; |
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module_param(allow_duplicates, bool, 0644); |
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static int disable_backlight_sysfs_if = -1; |
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module_param(disable_backlight_sysfs_if, int, 0444); |
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|
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#define REPORT_OUTPUT_KEY_EVENTS 0x01 |
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#define REPORT_BRIGHTNESS_KEY_EVENTS 0x02 |
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static int report_key_events = -1; |
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module_param(report_key_events, int, 0644); |
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MODULE_PARM_DESC(report_key_events, |
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"0: none, 1: output changes, 2: brightness changes, 3: all"); |
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|
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static int hw_changes_brightness = -1; |
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module_param(hw_changes_brightness, int, 0644); |
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MODULE_PARM_DESC(hw_changes_brightness, |
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"Set this to 1 on buggy hw which changes the brightness itself when " |
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"a hotkey is pressed: -1: auto, 0: normal 1: hw-changes-brightness"); |
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|
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/* |
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* Whether the struct acpi_video_device_attrib::device_id_scheme bit should be |
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* assumed even if not actually set. |
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*/ |
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static bool device_id_scheme = false; |
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module_param(device_id_scheme, bool, 0444); |
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|
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static int only_lcd = -1; |
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module_param(only_lcd, int, 0444); |
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|
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static int register_count; |
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static DEFINE_MUTEX(register_count_mutex); |
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static DEFINE_MUTEX(video_list_lock); |
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static LIST_HEAD(video_bus_head); |
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static int acpi_video_bus_add(struct acpi_device *device); |
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static int acpi_video_bus_remove(struct acpi_device *device); |
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static void acpi_video_bus_notify(struct acpi_device *device, u32 event); |
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void acpi_video_detect_exit(void); |
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|
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/* |
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* Indices in the _BCL method response: the first two items are special, |
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* the rest are all supported levels. |
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* |
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* See page 575 of the ACPI spec 3.0 |
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*/ |
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enum acpi_video_level_idx { |
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ACPI_VIDEO_AC_LEVEL, /* level when machine has full power */ |
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ACPI_VIDEO_BATTERY_LEVEL, /* level when machine is on batteries */ |
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ACPI_VIDEO_FIRST_LEVEL, /* actual supported levels begin here */ |
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}; |
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static const struct acpi_device_id video_device_ids[] = { |
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{ACPI_VIDEO_HID, 0}, |
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{"", 0}, |
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}; |
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MODULE_DEVICE_TABLE(acpi, video_device_ids); |
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|
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static struct acpi_driver acpi_video_bus = { |
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.name = "video", |
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.class = ACPI_VIDEO_CLASS, |
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.ids = video_device_ids, |
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.ops = { |
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.add = acpi_video_bus_add, |
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.remove = acpi_video_bus_remove, |
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.notify = acpi_video_bus_notify, |
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}, |
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}; |
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struct acpi_video_bus_flags { |
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u8 multihead:1; /* can switch video heads */ |
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u8 rom:1; /* can retrieve a video rom */ |
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u8 post:1; /* can configure the head to */ |
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u8 reserved:5; |
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}; |
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struct acpi_video_bus_cap { |
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u8 _DOS:1; /* Enable/Disable output switching */ |
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u8 _DOD:1; /* Enumerate all devices attached to display adapter */ |
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u8 _ROM:1; /* Get ROM Data */ |
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u8 _GPD:1; /* Get POST Device */ |
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u8 _SPD:1; /* Set POST Device */ |
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u8 _VPO:1; /* Video POST Options */ |
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u8 reserved:2; |
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}; |
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struct acpi_video_device_attrib { |
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u32 display_index:4; /* A zero-based instance of the Display */ |
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u32 display_port_attachment:4; /* This field differentiates the display type */ |
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u32 display_type:4; /* Describe the specific type in use */ |
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u32 vendor_specific:4; /* Chipset Vendor Specific */ |
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u32 bios_can_detect:1; /* BIOS can detect the device */ |
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u32 depend_on_vga:1; /* Non-VGA output device whose power is related to |
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the VGA device. */ |
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u32 pipe_id:3; /* For VGA multiple-head devices. */ |
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u32 reserved:10; /* Must be 0 */ |
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|
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/* |
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* The device ID might not actually follow the scheme described by this |
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* struct acpi_video_device_attrib. If it does, then this bit |
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* device_id_scheme is set; otherwise, other fields should be ignored. |
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* |
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* (but also see the global flag device_id_scheme) |
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*/ |
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u32 device_id_scheme:1; |
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}; |
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struct acpi_video_enumerated_device { |
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union { |
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u32 int_val; |
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struct acpi_video_device_attrib attrib; |
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} value; |
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struct acpi_video_device *bind_info; |
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}; |
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struct acpi_video_bus { |
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struct acpi_device *device; |
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bool backlight_registered; |
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u8 dos_setting; |
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struct acpi_video_enumerated_device *attached_array; |
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u8 attached_count; |
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u8 child_count; |
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struct acpi_video_bus_cap cap; |
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struct acpi_video_bus_flags flags; |
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struct list_head video_device_list; |
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struct mutex device_list_lock; /* protects video_device_list */ |
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struct list_head entry; |
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struct input_dev *input; |
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char phys[32]; /* for input device */ |
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struct notifier_block pm_nb; |
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}; |
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struct acpi_video_device_flags { |
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u8 crt:1; |
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u8 lcd:1; |
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u8 tvout:1; |
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u8 dvi:1; |
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u8 bios:1; |
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u8 unknown:1; |
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u8 notify:1; |
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u8 reserved:1; |
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}; |
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struct acpi_video_device_cap { |
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u8 _ADR:1; /* Return the unique ID */ |
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u8 _BCL:1; /* Query list of brightness control levels supported */ |
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u8 _BCM:1; /* Set the brightness level */ |
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u8 _BQC:1; /* Get current brightness level */ |
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u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */ |
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u8 _DDC:1; /* Return the EDID for this device */ |
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}; |
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struct acpi_video_device { |
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unsigned long device_id; |
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struct acpi_video_device_flags flags; |
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struct acpi_video_device_cap cap; |
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struct list_head entry; |
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struct delayed_work switch_brightness_work; |
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int switch_brightness_event; |
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struct acpi_video_bus *video; |
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struct acpi_device *dev; |
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struct acpi_video_device_brightness *brightness; |
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struct backlight_device *backlight; |
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struct thermal_cooling_device *cooling_dev; |
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}; |
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static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data); |
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static void acpi_video_device_rebind(struct acpi_video_bus *video); |
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static void acpi_video_device_bind(struct acpi_video_bus *video, |
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struct acpi_video_device *device); |
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static int acpi_video_device_enumerate(struct acpi_video_bus *video); |
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static int acpi_video_device_lcd_set_level(struct acpi_video_device *device, |
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int level); |
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static int acpi_video_device_lcd_get_level_current( |
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struct acpi_video_device *device, |
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unsigned long long *level, bool raw); |
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static int acpi_video_get_next_level(struct acpi_video_device *device, |
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u32 level_current, u32 event); |
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static void acpi_video_switch_brightness(struct work_struct *work); |
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|
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/* backlight device sysfs support */ |
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static int acpi_video_get_brightness(struct backlight_device *bd) |
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{ |
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unsigned long long cur_level; |
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int i; |
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struct acpi_video_device *vd = bl_get_data(bd); |
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if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false)) |
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return -EINVAL; |
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for (i = ACPI_VIDEO_FIRST_LEVEL; i < vd->brightness->count; i++) { |
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if (vd->brightness->levels[i] == cur_level) |
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return i - ACPI_VIDEO_FIRST_LEVEL; |
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} |
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return 0; |
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} |
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static int acpi_video_set_brightness(struct backlight_device *bd) |
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{ |
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int request_level = bd->props.brightness + ACPI_VIDEO_FIRST_LEVEL; |
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struct acpi_video_device *vd = bl_get_data(bd); |
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cancel_delayed_work(&vd->switch_brightness_work); |
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return acpi_video_device_lcd_set_level(vd, |
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vd->brightness->levels[request_level]); |
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} |
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static const struct backlight_ops acpi_backlight_ops = { |
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.get_brightness = acpi_video_get_brightness, |
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.update_status = acpi_video_set_brightness, |
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}; |
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/* thermal cooling device callbacks */ |
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static int video_get_max_state(struct thermal_cooling_device *cooling_dev, |
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unsigned long *state) |
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{ |
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struct acpi_device *device = cooling_dev->devdata; |
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struct acpi_video_device *video = acpi_driver_data(device); |
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*state = video->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1; |
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return 0; |
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} |
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static int video_get_cur_state(struct thermal_cooling_device *cooling_dev, |
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unsigned long *state) |
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{ |
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struct acpi_device *device = cooling_dev->devdata; |
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struct acpi_video_device *video = acpi_driver_data(device); |
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unsigned long long level; |
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int offset; |
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if (acpi_video_device_lcd_get_level_current(video, &level, false)) |
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return -EINVAL; |
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for (offset = ACPI_VIDEO_FIRST_LEVEL; offset < video->brightness->count; |
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offset++) |
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if (level == video->brightness->levels[offset]) { |
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*state = video->brightness->count - offset - 1; |
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return 0; |
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} |
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return -EINVAL; |
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} |
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static int |
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video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state) |
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{ |
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struct acpi_device *device = cooling_dev->devdata; |
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struct acpi_video_device *video = acpi_driver_data(device); |
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int level; |
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if (state >= video->brightness->count - ACPI_VIDEO_FIRST_LEVEL) |
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return -EINVAL; |
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state = video->brightness->count - state; |
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level = video->brightness->levels[state - 1]; |
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return acpi_video_device_lcd_set_level(video, level); |
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} |
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static const struct thermal_cooling_device_ops video_cooling_ops = { |
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.get_max_state = video_get_max_state, |
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.get_cur_state = video_get_cur_state, |
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.set_cur_state = video_set_cur_state, |
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}; |
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/* |
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* -------------------------------------------------------------------------- |
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* Video Management |
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* -------------------------------------------------------------------------- |
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*/ |
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static int |
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acpi_video_device_lcd_query_levels(acpi_handle handle, |
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union acpi_object **levels) |
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{ |
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int status; |
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struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
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union acpi_object *obj; |
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*levels = NULL; |
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status = acpi_evaluate_object(handle, "_BCL", NULL, &buffer); |
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if (ACPI_FAILURE(status)) |
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return status; |
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obj = (union acpi_object *)buffer.pointer; |
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if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) { |
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acpi_handle_info(handle, "Invalid _BCL data\n"); |
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status = -EFAULT; |
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goto err; |
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} |
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*levels = obj; |
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return 0; |
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err: |
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kfree(buffer.pointer); |
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return status; |
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} |
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static int |
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acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level) |
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{ |
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int status; |
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int state; |
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|
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status = acpi_execute_simple_method(device->dev->handle, |
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"_BCM", level); |
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if (ACPI_FAILURE(status)) { |
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acpi_handle_info(device->dev->handle, "_BCM evaluation failed\n"); |
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return -EIO; |
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} |
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device->brightness->curr = level; |
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for (state = ACPI_VIDEO_FIRST_LEVEL; state < device->brightness->count; |
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state++) |
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if (level == device->brightness->levels[state]) { |
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if (device->backlight) |
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device->backlight->props.brightness = |
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state - ACPI_VIDEO_FIRST_LEVEL; |
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return 0; |
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} |
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acpi_handle_info(device->dev->handle, "Current brightness invalid\n"); |
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return -EINVAL; |
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} |
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/* |
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* For some buggy _BQC methods, we need to add a constant value to |
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* the _BQC return value to get the actual current brightness level |
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*/ |
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static int bqc_offset_aml_bug_workaround; |
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static int video_set_bqc_offset(const struct dmi_system_id *d) |
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{ |
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bqc_offset_aml_bug_workaround = 9; |
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return 0; |
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} |
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static int video_disable_backlight_sysfs_if( |
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const struct dmi_system_id *d) |
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{ |
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if (disable_backlight_sysfs_if == -1) |
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disable_backlight_sysfs_if = 1; |
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return 0; |
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} |
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static int video_set_device_id_scheme(const struct dmi_system_id *d) |
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{ |
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device_id_scheme = true; |
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return 0; |
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} |
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static int video_enable_only_lcd(const struct dmi_system_id *d) |
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{ |
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only_lcd = true; |
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return 0; |
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} |
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static int video_set_report_key_events(const struct dmi_system_id *id) |
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{ |
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if (report_key_events == -1) |
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report_key_events = (uintptr_t)id->driver_data; |
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return 0; |
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} |
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static int video_hw_changes_brightness( |
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const struct dmi_system_id *d) |
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{ |
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if (hw_changes_brightness == -1) |
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hw_changes_brightness = 1; |
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return 0; |
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} |
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static const struct dmi_system_id video_dmi_table[] = { |
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/* |
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* Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121 |
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*/ |
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{ |
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.callback = video_set_bqc_offset, |
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.ident = "Acer Aspire 5720", |
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.matches = { |
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DMI_MATCH(DMI_BOARD_VENDOR, "Acer"), |
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DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"), |
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}, |
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}, |
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{ |
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.callback = video_set_bqc_offset, |
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.ident = "Acer Aspire 5710Z", |
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.matches = { |
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DMI_MATCH(DMI_BOARD_VENDOR, "Acer"), |
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DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"), |
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}, |
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}, |
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{ |
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.callback = video_set_bqc_offset, |
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.ident = "eMachines E510", |
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.matches = { |
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DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"), |
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DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"), |
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}, |
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}, |
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{ |
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.callback = video_set_bqc_offset, |
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.ident = "Acer Aspire 5315", |
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.matches = { |
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DMI_MATCH(DMI_BOARD_VENDOR, "Acer"), |
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DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"), |
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}, |
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}, |
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{ |
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.callback = video_set_bqc_offset, |
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.ident = "Acer Aspire 7720", |
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.matches = { |
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DMI_MATCH(DMI_BOARD_VENDOR, "Acer"), |
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DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"), |
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}, |
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}, |
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|
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/* |
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* Some machines have a broken acpi-video interface for brightness |
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* control, but still need an acpi_video_device_lcd_set_level() call |
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* on resume to turn the backlight power on. We Enable backlight |
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* control on these systems, but do not register a backlight sysfs |
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* as brightness control does not work. |
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*/ |
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{ |
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/* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */ |
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.callback = video_disable_backlight_sysfs_if, |
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.ident = "Toshiba Portege R700", |
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.matches = { |
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DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"), |
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DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R700"), |
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}, |
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}, |
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{ |
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/* https://bugs.freedesktop.org/show_bug.cgi?id=82634 */ |
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.callback = video_disable_backlight_sysfs_if, |
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.ident = "Toshiba Portege R830", |
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.matches = { |
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DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"), |
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DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R830"), |
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}, |
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}, |
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{ |
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/* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */ |
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.callback = video_disable_backlight_sysfs_if, |
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.ident = "Toshiba Satellite R830", |
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.matches = { |
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DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"), |
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DMI_MATCH(DMI_PRODUCT_NAME, "SATELLITE R830"), |
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}, |
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}, |
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/* |
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* Some machine's _DOD IDs don't have bit 31(Device ID Scheme) set |
|
* but the IDs actually follow the Device ID Scheme. |
|
*/ |
|
{ |
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/* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */ |
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.callback = video_set_device_id_scheme, |
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.ident = "ESPRIMO Mobile M9410", |
|
.matches = { |
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DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"), |
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DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"), |
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}, |
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}, |
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/* |
|
* Some machines have multiple video output devices, but only the one |
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* that is the type of LCD can do the backlight control so we should not |
|
* register backlight interface for other video output devices. |
|
*/ |
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{ |
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/* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */ |
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.callback = video_enable_only_lcd, |
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.ident = "ESPRIMO Mobile M9410", |
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.matches = { |
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DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"), |
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DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"), |
|
}, |
|
}, |
|
/* |
|
* Some machines report wrong key events on the acpi-bus, suppress |
|
* key event reporting on these. Note this is only intended to work |
|
* around events which are plain wrong. In some cases we get double |
|
* events, in this case acpi-video is considered the canonical source |
|
* and the events from the other source should be filtered. E.g. |
|
* by calling acpi_video_handles_brightness_key_presses() from the |
|
* vendor acpi/wmi driver or by using /lib/udev/hwdb.d/60-keyboard.hwdb |
|
*/ |
|
{ |
|
.callback = video_set_report_key_events, |
|
.driver_data = (void *)((uintptr_t)REPORT_OUTPUT_KEY_EVENTS), |
|
.ident = "Dell Vostro V131", |
|
.matches = { |
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DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), |
|
DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"), |
|
}, |
|
}, |
|
/* |
|
* Some machines change the brightness themselves when a brightness |
|
* hotkey gets pressed, despite us telling them not to. In this case |
|
* acpi_video_device_notify() should only call backlight_force_update( |
|
* BACKLIGHT_UPDATE_HOTKEY) and not do anything else. |
|
*/ |
|
{ |
|
/* https://bugzilla.kernel.org/show_bug.cgi?id=204077 */ |
|
.callback = video_hw_changes_brightness, |
|
.ident = "Packard Bell EasyNote MZ35", |
|
.matches = { |
|
DMI_MATCH(DMI_SYS_VENDOR, "Packard Bell"), |
|
DMI_MATCH(DMI_PRODUCT_NAME, "EasyNote MZ35"), |
|
}, |
|
}, |
|
{} |
|
}; |
|
|
|
static unsigned long long |
|
acpi_video_bqc_value_to_level(struct acpi_video_device *device, |
|
unsigned long long bqc_value) |
|
{ |
|
unsigned long long level; |
|
|
|
if (device->brightness->flags._BQC_use_index) { |
|
/* |
|
* _BQC returns an index that doesn't account for the first 2 |
|
* items with special meaning (see enum acpi_video_level_idx), |
|
* so we need to compensate for that by offsetting ourselves |
|
*/ |
|
if (device->brightness->flags._BCL_reversed) |
|
bqc_value = device->brightness->count - |
|
ACPI_VIDEO_FIRST_LEVEL - 1 - bqc_value; |
|
|
|
level = device->brightness->levels[bqc_value + |
|
ACPI_VIDEO_FIRST_LEVEL]; |
|
} else { |
|
level = bqc_value; |
|
} |
|
|
|
level += bqc_offset_aml_bug_workaround; |
|
|
|
return level; |
|
} |
|
|
|
static int |
|
acpi_video_device_lcd_get_level_current(struct acpi_video_device *device, |
|
unsigned long long *level, bool raw) |
|
{ |
|
acpi_status status = AE_OK; |
|
int i; |
|
|
|
if (device->cap._BQC || device->cap._BCQ) { |
|
char *buf = device->cap._BQC ? "_BQC" : "_BCQ"; |
|
|
|
status = acpi_evaluate_integer(device->dev->handle, buf, |
|
NULL, level); |
|
if (ACPI_SUCCESS(status)) { |
|
if (raw) { |
|
/* |
|
* Caller has indicated he wants the raw |
|
* value returned by _BQC, so don't furtherly |
|
* mess with the value. |
|
*/ |
|
return 0; |
|
} |
|
|
|
*level = acpi_video_bqc_value_to_level(device, *level); |
|
|
|
for (i = ACPI_VIDEO_FIRST_LEVEL; |
|
i < device->brightness->count; i++) |
|
if (device->brightness->levels[i] == *level) { |
|
device->brightness->curr = *level; |
|
return 0; |
|
} |
|
/* |
|
* BQC returned an invalid level. |
|
* Stop using it. |
|
*/ |
|
acpi_handle_info(device->dev->handle, |
|
"%s returned an invalid level", buf); |
|
device->cap._BQC = device->cap._BCQ = 0; |
|
} else { |
|
/* |
|
* Fixme: |
|
* should we return an error or ignore this failure? |
|
* dev->brightness->curr is a cached value which stores |
|
* the correct current backlight level in most cases. |
|
* ACPI video backlight still works w/ buggy _BQC. |
|
* http://bugzilla.kernel.org/show_bug.cgi?id=12233 |
|
*/ |
|
acpi_handle_info(device->dev->handle, |
|
"%s evaluation failed", buf); |
|
device->cap._BQC = device->cap._BCQ = 0; |
|
} |
|
} |
|
|
|
*level = device->brightness->curr; |
|
return 0; |
|
} |
|
|
|
static int |
|
acpi_video_device_EDID(struct acpi_video_device *device, |
|
union acpi_object **edid, ssize_t length) |
|
{ |
|
int status; |
|
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
|
union acpi_object *obj; |
|
union acpi_object arg0 = { ACPI_TYPE_INTEGER }; |
|
struct acpi_object_list args = { 1, &arg0 }; |
|
|
|
|
|
*edid = NULL; |
|
|
|
if (!device) |
|
return -ENODEV; |
|
if (length == 128) |
|
arg0.integer.value = 1; |
|
else if (length == 256) |
|
arg0.integer.value = 2; |
|
else |
|
return -EINVAL; |
|
|
|
status = acpi_evaluate_object(device->dev->handle, "_DDC", &args, &buffer); |
|
if (ACPI_FAILURE(status)) |
|
return -ENODEV; |
|
|
|
obj = buffer.pointer; |
|
|
|
if (obj && obj->type == ACPI_TYPE_BUFFER) |
|
*edid = obj; |
|
else { |
|
acpi_handle_info(device->dev->handle, "Invalid _DDC data\n"); |
|
status = -EFAULT; |
|
kfree(obj); |
|
} |
|
|
|
return status; |
|
} |
|
|
|
/* bus */ |
|
|
|
/* |
|
* Arg: |
|
* video : video bus device pointer |
|
* bios_flag : |
|
* 0. The system BIOS should NOT automatically switch(toggle) |
|
* the active display output. |
|
* 1. The system BIOS should automatically switch (toggle) the |
|
* active display output. No switch event. |
|
* 2. The _DGS value should be locked. |
|
* 3. The system BIOS should not automatically switch (toggle) the |
|
* active display output, but instead generate the display switch |
|
* event notify code. |
|
* lcd_flag : |
|
* 0. The system BIOS should automatically control the brightness level |
|
* of the LCD when: |
|
* - the power changes from AC to DC (ACPI appendix B) |
|
* - a brightness hotkey gets pressed (implied by Win7/8 backlight docs) |
|
* 1. The system BIOS should NOT automatically control the brightness |
|
* level of the LCD when: |
|
* - the power changes from AC to DC (ACPI appendix B) |
|
* - a brightness hotkey gets pressed (implied by Win7/8 backlight docs) |
|
* Return Value: |
|
* -EINVAL wrong arg. |
|
*/ |
|
|
|
static int |
|
acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag) |
|
{ |
|
acpi_status status; |
|
|
|
if (!video->cap._DOS) |
|
return 0; |
|
|
|
if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) |
|
return -EINVAL; |
|
video->dos_setting = (lcd_flag << 2) | bios_flag; |
|
status = acpi_execute_simple_method(video->device->handle, "_DOS", |
|
(lcd_flag << 2) | bios_flag); |
|
if (ACPI_FAILURE(status)) |
|
return -EIO; |
|
|
|
return 0; |
|
} |
|
|
|
/* |
|
* Simple comparison function used to sort backlight levels. |
|
*/ |
|
|
|
static int |
|
acpi_video_cmp_level(const void *a, const void *b) |
|
{ |
|
return *(int *)a - *(int *)b; |
|
} |
|
|
|
/* |
|
* Decides if _BQC/_BCQ for this system is usable |
|
* |
|
* We do this by changing the level first and then read out the current |
|
* brightness level, if the value does not match, find out if it is using |
|
* index. If not, clear the _BQC/_BCQ capability. |
|
*/ |
|
static int acpi_video_bqc_quirk(struct acpi_video_device *device, |
|
int max_level, int current_level) |
|
{ |
|
struct acpi_video_device_brightness *br = device->brightness; |
|
int result; |
|
unsigned long long level; |
|
int test_level; |
|
|
|
/* don't mess with existing known broken systems */ |
|
if (bqc_offset_aml_bug_workaround) |
|
return 0; |
|
|
|
/* |
|
* Some systems always report current brightness level as maximum |
|
* through _BQC, we need to test another value for them. However, |
|
* there is a subtlety: |
|
* |
|
* If the _BCL package ordering is descending, the first level |
|
* (br->levels[2]) is likely to be 0, and if the number of levels |
|
* matches the number of steps, we might confuse a returned level to |
|
* mean the index. |
|
* |
|
* For example: |
|
* |
|
* current_level = max_level = 100 |
|
* test_level = 0 |
|
* returned level = 100 |
|
* |
|
* In this case 100 means the level, not the index, and _BCM failed. |
|
* Still, if the _BCL package ordering is descending, the index of |
|
* level 0 is also 100, so we assume _BQC is indexed, when it's not. |
|
* |
|
* This causes all _BQC calls to return bogus values causing weird |
|
* behavior from the user's perspective. For example: |
|
* |
|
* xbacklight -set 10; xbacklight -set 20; |
|
* |
|
* would flash to 90% and then slowly down to the desired level (20). |
|
* |
|
* The solution is simple; test anything other than the first level |
|
* (e.g. 1). |
|
*/ |
|
test_level = current_level == max_level |
|
? br->levels[ACPI_VIDEO_FIRST_LEVEL + 1] |
|
: max_level; |
|
|
|
result = acpi_video_device_lcd_set_level(device, test_level); |
|
if (result) |
|
return result; |
|
|
|
result = acpi_video_device_lcd_get_level_current(device, &level, true); |
|
if (result) |
|
return result; |
|
|
|
if (level != test_level) { |
|
/* buggy _BQC found, need to find out if it uses index */ |
|
if (level < br->count) { |
|
if (br->flags._BCL_reversed) |
|
level = br->count - ACPI_VIDEO_FIRST_LEVEL - 1 - level; |
|
if (br->levels[level + ACPI_VIDEO_FIRST_LEVEL] == test_level) |
|
br->flags._BQC_use_index = 1; |
|
} |
|
|
|
if (!br->flags._BQC_use_index) |
|
device->cap._BQC = device->cap._BCQ = 0; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
int acpi_video_get_levels(struct acpi_device *device, |
|
struct acpi_video_device_brightness **dev_br, |
|
int *pmax_level) |
|
{ |
|
union acpi_object *obj = NULL; |
|
int i, max_level = 0, count = 0, level_ac_battery = 0; |
|
union acpi_object *o; |
|
struct acpi_video_device_brightness *br = NULL; |
|
int result = 0; |
|
u32 value; |
|
|
|
if (ACPI_FAILURE(acpi_video_device_lcd_query_levels(device->handle, &obj))) { |
|
acpi_handle_debug(device->handle, |
|
"Could not query available LCD brightness level\n"); |
|
result = -ENODEV; |
|
goto out; |
|
} |
|
|
|
if (obj->package.count < ACPI_VIDEO_FIRST_LEVEL) { |
|
result = -EINVAL; |
|
goto out; |
|
} |
|
|
|
br = kzalloc(sizeof(*br), GFP_KERNEL); |
|
if (!br) { |
|
result = -ENOMEM; |
|
goto out; |
|
} |
|
|
|
/* |
|
* Note that we have to reserve 2 extra items (ACPI_VIDEO_FIRST_LEVEL), |
|
* in order to account for buggy BIOS which don't export the first two |
|
* special levels (see below) |
|
*/ |
|
br->levels = kmalloc_array(obj->package.count + ACPI_VIDEO_FIRST_LEVEL, |
|
sizeof(*br->levels), |
|
GFP_KERNEL); |
|
if (!br->levels) { |
|
result = -ENOMEM; |
|
goto out_free; |
|
} |
|
|
|
for (i = 0; i < obj->package.count; i++) { |
|
o = (union acpi_object *)&obj->package.elements[i]; |
|
if (o->type != ACPI_TYPE_INTEGER) { |
|
acpi_handle_info(device->handle, "Invalid data\n"); |
|
continue; |
|
} |
|
value = (u32) o->integer.value; |
|
/* Skip duplicate entries */ |
|
if (count > ACPI_VIDEO_FIRST_LEVEL |
|
&& br->levels[count - 1] == value) |
|
continue; |
|
|
|
br->levels[count] = value; |
|
|
|
if (br->levels[count] > max_level) |
|
max_level = br->levels[count]; |
|
count++; |
|
} |
|
|
|
/* |
|
* some buggy BIOS don't export the levels |
|
* when machine is on AC/Battery in _BCL package. |
|
* In this case, the first two elements in _BCL packages |
|
* are also supported brightness levels that OS should take care of. |
|
*/ |
|
for (i = ACPI_VIDEO_FIRST_LEVEL; i < count; i++) { |
|
if (br->levels[i] == br->levels[ACPI_VIDEO_AC_LEVEL]) |
|
level_ac_battery++; |
|
if (br->levels[i] == br->levels[ACPI_VIDEO_BATTERY_LEVEL]) |
|
level_ac_battery++; |
|
} |
|
|
|
if (level_ac_battery < ACPI_VIDEO_FIRST_LEVEL) { |
|
level_ac_battery = ACPI_VIDEO_FIRST_LEVEL - level_ac_battery; |
|
br->flags._BCL_no_ac_battery_levels = 1; |
|
for (i = (count - 1 + level_ac_battery); |
|
i >= ACPI_VIDEO_FIRST_LEVEL; i--) |
|
br->levels[i] = br->levels[i - level_ac_battery]; |
|
count += level_ac_battery; |
|
} else if (level_ac_battery > ACPI_VIDEO_FIRST_LEVEL) |
|
acpi_handle_info(device->handle, |
|
"Too many duplicates in _BCL package"); |
|
|
|
/* Check if the _BCL package is in a reversed order */ |
|
if (max_level == br->levels[ACPI_VIDEO_FIRST_LEVEL]) { |
|
br->flags._BCL_reversed = 1; |
|
sort(&br->levels[ACPI_VIDEO_FIRST_LEVEL], |
|
count - ACPI_VIDEO_FIRST_LEVEL, |
|
sizeof(br->levels[ACPI_VIDEO_FIRST_LEVEL]), |
|
acpi_video_cmp_level, NULL); |
|
} else if (max_level != br->levels[count - 1]) |
|
acpi_handle_info(device->handle, |
|
"Found unordered _BCL package"); |
|
|
|
br->count = count; |
|
*dev_br = br; |
|
if (pmax_level) |
|
*pmax_level = max_level; |
|
|
|
out: |
|
kfree(obj); |
|
return result; |
|
out_free: |
|
kfree(br); |
|
goto out; |
|
} |
|
EXPORT_SYMBOL(acpi_video_get_levels); |
|
|
|
/* |
|
* Arg: |
|
* device : video output device (LCD, CRT, ..) |
|
* |
|
* Return Value: |
|
* Maximum brightness level |
|
* |
|
* Allocate and initialize device->brightness. |
|
*/ |
|
|
|
static int |
|
acpi_video_init_brightness(struct acpi_video_device *device) |
|
{ |
|
int i, max_level = 0; |
|
unsigned long long level, level_old; |
|
struct acpi_video_device_brightness *br = NULL; |
|
int result; |
|
|
|
result = acpi_video_get_levels(device->dev, &br, &max_level); |
|
if (result) |
|
return result; |
|
device->brightness = br; |
|
|
|
/* _BQC uses INDEX while _BCL uses VALUE in some laptops */ |
|
br->curr = level = max_level; |
|
|
|
if (!device->cap._BQC) |
|
goto set_level; |
|
|
|
result = acpi_video_device_lcd_get_level_current(device, |
|
&level_old, true); |
|
if (result) |
|
goto out_free_levels; |
|
|
|
result = acpi_video_bqc_quirk(device, max_level, level_old); |
|
if (result) |
|
goto out_free_levels; |
|
/* |
|
* cap._BQC may get cleared due to _BQC is found to be broken |
|
* in acpi_video_bqc_quirk, so check again here. |
|
*/ |
|
if (!device->cap._BQC) |
|
goto set_level; |
|
|
|
level = acpi_video_bqc_value_to_level(device, level_old); |
|
/* |
|
* On some buggy laptops, _BQC returns an uninitialized |
|
* value when invoked for the first time, i.e. |
|
* level_old is invalid (no matter whether it's a level |
|
* or an index). Set the backlight to max_level in this case. |
|
*/ |
|
for (i = ACPI_VIDEO_FIRST_LEVEL; i < br->count; i++) |
|
if (level == br->levels[i]) |
|
break; |
|
if (i == br->count || !level) |
|
level = max_level; |
|
|
|
set_level: |
|
result = acpi_video_device_lcd_set_level(device, level); |
|
if (result) |
|
goto out_free_levels; |
|
|
|
acpi_handle_debug(device->dev->handle, "found %d brightness levels\n", |
|
br->count - ACPI_VIDEO_FIRST_LEVEL); |
|
|
|
return 0; |
|
|
|
out_free_levels: |
|
kfree(br->levels); |
|
kfree(br); |
|
device->brightness = NULL; |
|
return result; |
|
} |
|
|
|
/* |
|
* Arg: |
|
* device : video output device (LCD, CRT, ..) |
|
* |
|
* Return Value: |
|
* None |
|
* |
|
* Find out all required AML methods defined under the output |
|
* device. |
|
*/ |
|
|
|
static void acpi_video_device_find_cap(struct acpi_video_device *device) |
|
{ |
|
if (acpi_has_method(device->dev->handle, "_ADR")) |
|
device->cap._ADR = 1; |
|
if (acpi_has_method(device->dev->handle, "_BCL")) |
|
device->cap._BCL = 1; |
|
if (acpi_has_method(device->dev->handle, "_BCM")) |
|
device->cap._BCM = 1; |
|
if (acpi_has_method(device->dev->handle, "_BQC")) { |
|
device->cap._BQC = 1; |
|
} else if (acpi_has_method(device->dev->handle, "_BCQ")) { |
|
acpi_handle_info(device->dev->handle, |
|
"_BCQ is used instead of _BQC\n"); |
|
device->cap._BCQ = 1; |
|
} |
|
|
|
if (acpi_has_method(device->dev->handle, "_DDC")) |
|
device->cap._DDC = 1; |
|
} |
|
|
|
/* |
|
* Arg: |
|
* device : video output device (VGA) |
|
* |
|
* Return Value: |
|
* None |
|
* |
|
* Find out all required AML methods defined under the video bus device. |
|
*/ |
|
|
|
static void acpi_video_bus_find_cap(struct acpi_video_bus *video) |
|
{ |
|
if (acpi_has_method(video->device->handle, "_DOS")) |
|
video->cap._DOS = 1; |
|
if (acpi_has_method(video->device->handle, "_DOD")) |
|
video->cap._DOD = 1; |
|
if (acpi_has_method(video->device->handle, "_ROM")) |
|
video->cap._ROM = 1; |
|
if (acpi_has_method(video->device->handle, "_GPD")) |
|
video->cap._GPD = 1; |
|
if (acpi_has_method(video->device->handle, "_SPD")) |
|
video->cap._SPD = 1; |
|
if (acpi_has_method(video->device->handle, "_VPO")) |
|
video->cap._VPO = 1; |
|
} |
|
|
|
/* |
|
* Check whether the video bus device has required AML method to |
|
* support the desired features |
|
*/ |
|
|
|
static int acpi_video_bus_check(struct acpi_video_bus *video) |
|
{ |
|
acpi_status status = -ENOENT; |
|
struct pci_dev *dev; |
|
|
|
if (!video) |
|
return -EINVAL; |
|
|
|
dev = acpi_get_pci_dev(video->device->handle); |
|
if (!dev) |
|
return -ENODEV; |
|
pci_dev_put(dev); |
|
|
|
/* |
|
* Since there is no HID, CID and so on for VGA driver, we have |
|
* to check well known required nodes. |
|
*/ |
|
|
|
/* Does this device support video switching? */ |
|
if (video->cap._DOS || video->cap._DOD) { |
|
if (!video->cap._DOS) { |
|
pr_info(FW_BUG "ACPI(%s) defines _DOD but not _DOS\n", |
|
acpi_device_bid(video->device)); |
|
} |
|
video->flags.multihead = 1; |
|
status = 0; |
|
} |
|
|
|
/* Does this device support retrieving a video ROM? */ |
|
if (video->cap._ROM) { |
|
video->flags.rom = 1; |
|
status = 0; |
|
} |
|
|
|
/* Does this device support configuring which video device to POST? */ |
|
if (video->cap._GPD && video->cap._SPD && video->cap._VPO) { |
|
video->flags.post = 1; |
|
status = 0; |
|
} |
|
|
|
return status; |
|
} |
|
|
|
/* |
|
* -------------------------------------------------------------------------- |
|
* Driver Interface |
|
* -------------------------------------------------------------------------- |
|
*/ |
|
|
|
/* device interface */ |
|
static struct acpi_video_device_attrib * |
|
acpi_video_get_device_attr(struct acpi_video_bus *video, unsigned long device_id) |
|
{ |
|
struct acpi_video_enumerated_device *ids; |
|
int i; |
|
|
|
for (i = 0; i < video->attached_count; i++) { |
|
ids = &video->attached_array[i]; |
|
if ((ids->value.int_val & 0xffff) == device_id) |
|
return &ids->value.attrib; |
|
} |
|
|
|
return NULL; |
|
} |
|
|
|
static int |
|
acpi_video_get_device_type(struct acpi_video_bus *video, |
|
unsigned long device_id) |
|
{ |
|
struct acpi_video_enumerated_device *ids; |
|
int i; |
|
|
|
for (i = 0; i < video->attached_count; i++) { |
|
ids = &video->attached_array[i]; |
|
if ((ids->value.int_val & 0xffff) == device_id) |
|
return ids->value.int_val; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int |
|
acpi_video_bus_get_one_device(struct acpi_device *device, |
|
struct acpi_video_bus *video) |
|
{ |
|
unsigned long long device_id; |
|
int status, device_type; |
|
struct acpi_video_device *data; |
|
struct acpi_video_device_attrib *attribute; |
|
|
|
status = |
|
acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id); |
|
/* Some device omits _ADR, we skip them instead of fail */ |
|
if (ACPI_FAILURE(status)) |
|
return 0; |
|
|
|
data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL); |
|
if (!data) |
|
return -ENOMEM; |
|
|
|
strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME); |
|
strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS); |
|
device->driver_data = data; |
|
|
|
data->device_id = device_id; |
|
data->video = video; |
|
data->dev = device; |
|
INIT_DELAYED_WORK(&data->switch_brightness_work, |
|
acpi_video_switch_brightness); |
|
|
|
attribute = acpi_video_get_device_attr(video, device_id); |
|
|
|
if (attribute && (attribute->device_id_scheme || device_id_scheme)) { |
|
switch (attribute->display_type) { |
|
case ACPI_VIDEO_DISPLAY_CRT: |
|
data->flags.crt = 1; |
|
break; |
|
case ACPI_VIDEO_DISPLAY_TV: |
|
data->flags.tvout = 1; |
|
break; |
|
case ACPI_VIDEO_DISPLAY_DVI: |
|
data->flags.dvi = 1; |
|
break; |
|
case ACPI_VIDEO_DISPLAY_LCD: |
|
data->flags.lcd = 1; |
|
break; |
|
default: |
|
data->flags.unknown = 1; |
|
break; |
|
} |
|
if (attribute->bios_can_detect) |
|
data->flags.bios = 1; |
|
} else { |
|
/* Check for legacy IDs */ |
|
device_type = acpi_video_get_device_type(video, device_id); |
|
/* Ignore bits 16 and 18-20 */ |
|
switch (device_type & 0xffe2ffff) { |
|
case ACPI_VIDEO_DISPLAY_LEGACY_MONITOR: |
|
data->flags.crt = 1; |
|
break; |
|
case ACPI_VIDEO_DISPLAY_LEGACY_PANEL: |
|
data->flags.lcd = 1; |
|
break; |
|
case ACPI_VIDEO_DISPLAY_LEGACY_TV: |
|
data->flags.tvout = 1; |
|
break; |
|
default: |
|
data->flags.unknown = 1; |
|
} |
|
} |
|
|
|
acpi_video_device_bind(video, data); |
|
acpi_video_device_find_cap(data); |
|
|
|
mutex_lock(&video->device_list_lock); |
|
list_add_tail(&data->entry, &video->video_device_list); |
|
mutex_unlock(&video->device_list_lock); |
|
|
|
return status; |
|
} |
|
|
|
/* |
|
* Arg: |
|
* video : video bus device |
|
* |
|
* Return: |
|
* none |
|
* |
|
* Enumerate the video device list of the video bus, |
|
* bind the ids with the corresponding video devices |
|
* under the video bus. |
|
*/ |
|
|
|
static void acpi_video_device_rebind(struct acpi_video_bus *video) |
|
{ |
|
struct acpi_video_device *dev; |
|
|
|
mutex_lock(&video->device_list_lock); |
|
|
|
list_for_each_entry(dev, &video->video_device_list, entry) |
|
acpi_video_device_bind(video, dev); |
|
|
|
mutex_unlock(&video->device_list_lock); |
|
} |
|
|
|
/* |
|
* Arg: |
|
* video : video bus device |
|
* device : video output device under the video |
|
* bus |
|
* |
|
* Return: |
|
* none |
|
* |
|
* Bind the ids with the corresponding video devices |
|
* under the video bus. |
|
*/ |
|
|
|
static void |
|
acpi_video_device_bind(struct acpi_video_bus *video, |
|
struct acpi_video_device *device) |
|
{ |
|
struct acpi_video_enumerated_device *ids; |
|
int i; |
|
|
|
for (i = 0; i < video->attached_count; i++) { |
|
ids = &video->attached_array[i]; |
|
if (device->device_id == (ids->value.int_val & 0xffff)) { |
|
ids->bind_info = device; |
|
acpi_handle_debug(video->device->handle, "%s: %d\n", |
|
__func__, i); |
|
} |
|
} |
|
} |
|
|
|
static bool acpi_video_device_in_dod(struct acpi_video_device *device) |
|
{ |
|
struct acpi_video_bus *video = device->video; |
|
int i; |
|
|
|
/* |
|
* If we have a broken _DOD or we have more than 8 output devices |
|
* under the graphics controller node that we can't proper deal with |
|
* in the operation region code currently, no need to test. |
|
*/ |
|
if (!video->attached_count || video->child_count > 8) |
|
return true; |
|
|
|
for (i = 0; i < video->attached_count; i++) { |
|
if ((video->attached_array[i].value.int_val & 0xfff) == |
|
(device->device_id & 0xfff)) |
|
return true; |
|
} |
|
|
|
return false; |
|
} |
|
|
|
/* |
|
* Arg: |
|
* video : video bus device |
|
* |
|
* Return: |
|
* < 0 : error |
|
* |
|
* Call _DOD to enumerate all devices attached to display adapter |
|
* |
|
*/ |
|
|
|
static int acpi_video_device_enumerate(struct acpi_video_bus *video) |
|
{ |
|
int status; |
|
int count; |
|
int i; |
|
struct acpi_video_enumerated_device *active_list; |
|
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL }; |
|
union acpi_object *dod = NULL; |
|
union acpi_object *obj; |
|
|
|
if (!video->cap._DOD) |
|
return AE_NOT_EXIST; |
|
|
|
status = acpi_evaluate_object(video->device->handle, "_DOD", NULL, &buffer); |
|
if (ACPI_FAILURE(status)) { |
|
acpi_handle_info(video->device->handle, |
|
"_DOD evaluation failed: %s\n", |
|
acpi_format_exception(status)); |
|
return status; |
|
} |
|
|
|
dod = buffer.pointer; |
|
if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) { |
|
acpi_handle_info(video->device->handle, "Invalid _DOD data\n"); |
|
status = -EFAULT; |
|
goto out; |
|
} |
|
|
|
acpi_handle_debug(video->device->handle, "Found %d video heads in _DOD\n", |
|
dod->package.count); |
|
|
|
active_list = kcalloc(1 + dod->package.count, |
|
sizeof(struct acpi_video_enumerated_device), |
|
GFP_KERNEL); |
|
if (!active_list) { |
|
status = -ENOMEM; |
|
goto out; |
|
} |
|
|
|
count = 0; |
|
for (i = 0; i < dod->package.count; i++) { |
|
obj = &dod->package.elements[i]; |
|
|
|
if (obj->type != ACPI_TYPE_INTEGER) { |
|
acpi_handle_info(video->device->handle, |
|
"Invalid _DOD data in element %d\n", i); |
|
continue; |
|
} |
|
|
|
active_list[count].value.int_val = obj->integer.value; |
|
active_list[count].bind_info = NULL; |
|
|
|
acpi_handle_debug(video->device->handle, |
|
"_DOD element[%d] = %d\n", i, |
|
(int)obj->integer.value); |
|
|
|
count++; |
|
} |
|
|
|
kfree(video->attached_array); |
|
|
|
video->attached_array = active_list; |
|
video->attached_count = count; |
|
|
|
out: |
|
kfree(buffer.pointer); |
|
return status; |
|
} |
|
|
|
static int |
|
acpi_video_get_next_level(struct acpi_video_device *device, |
|
u32 level_current, u32 event) |
|
{ |
|
int min, max, min_above, max_below, i, l, delta = 255; |
|
max = max_below = 0; |
|
min = min_above = 255; |
|
/* Find closest level to level_current */ |
|
for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) { |
|
l = device->brightness->levels[i]; |
|
if (abs(l - level_current) < abs(delta)) { |
|
delta = l - level_current; |
|
if (!delta) |
|
break; |
|
} |
|
} |
|
/* Ajust level_current to closest available level */ |
|
level_current += delta; |
|
for (i = ACPI_VIDEO_FIRST_LEVEL; i < device->brightness->count; i++) { |
|
l = device->brightness->levels[i]; |
|
if (l < min) |
|
min = l; |
|
if (l > max) |
|
max = l; |
|
if (l < min_above && l > level_current) |
|
min_above = l; |
|
if (l > max_below && l < level_current) |
|
max_below = l; |
|
} |
|
|
|
switch (event) { |
|
case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: |
|
return (level_current < max) ? min_above : min; |
|
case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: |
|
return (level_current < max) ? min_above : max; |
|
case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: |
|
return (level_current > min) ? max_below : min; |
|
case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: |
|
case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: |
|
return 0; |
|
default: |
|
return level_current; |
|
} |
|
} |
|
|
|
static void |
|
acpi_video_switch_brightness(struct work_struct *work) |
|
{ |
|
struct acpi_video_device *device = container_of(to_delayed_work(work), |
|
struct acpi_video_device, switch_brightness_work); |
|
unsigned long long level_current, level_next; |
|
int event = device->switch_brightness_event; |
|
int result = -EINVAL; |
|
|
|
/* no warning message if acpi_backlight=vendor or a quirk is used */ |
|
if (!device->backlight) |
|
return; |
|
|
|
if (!device->brightness) |
|
goto out; |
|
|
|
result = acpi_video_device_lcd_get_level_current(device, |
|
&level_current, |
|
false); |
|
if (result) |
|
goto out; |
|
|
|
level_next = acpi_video_get_next_level(device, level_current, event); |
|
|
|
result = acpi_video_device_lcd_set_level(device, level_next); |
|
|
|
if (!result) |
|
backlight_force_update(device->backlight, |
|
BACKLIGHT_UPDATE_HOTKEY); |
|
|
|
out: |
|
if (result) |
|
acpi_handle_info(device->dev->handle, |
|
"Failed to switch brightness\n"); |
|
} |
|
|
|
int acpi_video_get_edid(struct acpi_device *device, int type, int device_id, |
|
void **edid) |
|
{ |
|
struct acpi_video_bus *video; |
|
struct acpi_video_device *video_device; |
|
union acpi_object *buffer = NULL; |
|
acpi_status status; |
|
int i, length; |
|
|
|
if (!device || !acpi_driver_data(device)) |
|
return -EINVAL; |
|
|
|
video = acpi_driver_data(device); |
|
|
|
for (i = 0; i < video->attached_count; i++) { |
|
video_device = video->attached_array[i].bind_info; |
|
length = 256; |
|
|
|
if (!video_device) |
|
continue; |
|
|
|
if (!video_device->cap._DDC) |
|
continue; |
|
|
|
if (type) { |
|
switch (type) { |
|
case ACPI_VIDEO_DISPLAY_CRT: |
|
if (!video_device->flags.crt) |
|
continue; |
|
break; |
|
case ACPI_VIDEO_DISPLAY_TV: |
|
if (!video_device->flags.tvout) |
|
continue; |
|
break; |
|
case ACPI_VIDEO_DISPLAY_DVI: |
|
if (!video_device->flags.dvi) |
|
continue; |
|
break; |
|
case ACPI_VIDEO_DISPLAY_LCD: |
|
if (!video_device->flags.lcd) |
|
continue; |
|
break; |
|
} |
|
} else if (video_device->device_id != device_id) { |
|
continue; |
|
} |
|
|
|
status = acpi_video_device_EDID(video_device, &buffer, length); |
|
|
|
if (ACPI_FAILURE(status) || !buffer || |
|
buffer->type != ACPI_TYPE_BUFFER) { |
|
length = 128; |
|
status = acpi_video_device_EDID(video_device, &buffer, |
|
length); |
|
if (ACPI_FAILURE(status) || !buffer || |
|
buffer->type != ACPI_TYPE_BUFFER) { |
|
continue; |
|
} |
|
} |
|
|
|
*edid = buffer->buffer.pointer; |
|
return length; |
|
} |
|
|
|
return -ENODEV; |
|
} |
|
EXPORT_SYMBOL(acpi_video_get_edid); |
|
|
|
static int |
|
acpi_video_bus_get_devices(struct acpi_video_bus *video, |
|
struct acpi_device *device) |
|
{ |
|
int status = 0; |
|
struct acpi_device *dev; |
|
|
|
/* |
|
* There are systems where video module known to work fine regardless |
|
* of broken _DOD and ignoring returned value here doesn't cause |
|
* any issues later. |
|
*/ |
|
acpi_video_device_enumerate(video); |
|
|
|
list_for_each_entry(dev, &device->children, node) { |
|
|
|
status = acpi_video_bus_get_one_device(dev, video); |
|
if (status) { |
|
dev_err(&dev->dev, "Can't attach device\n"); |
|
break; |
|
} |
|
video->child_count++; |
|
} |
|
return status; |
|
} |
|
|
|
/* acpi_video interface */ |
|
|
|
/* |
|
* Win8 requires setting bit2 of _DOS to let firmware know it shouldn't |
|
* preform any automatic brightness change on receiving a notification. |
|
*/ |
|
static int acpi_video_bus_start_devices(struct acpi_video_bus *video) |
|
{ |
|
return acpi_video_bus_DOS(video, 0, |
|
acpi_osi_is_win8() ? 1 : 0); |
|
} |
|
|
|
static int acpi_video_bus_stop_devices(struct acpi_video_bus *video) |
|
{ |
|
return acpi_video_bus_DOS(video, 0, |
|
acpi_osi_is_win8() ? 0 : 1); |
|
} |
|
|
|
static void acpi_video_bus_notify(struct acpi_device *device, u32 event) |
|
{ |
|
struct acpi_video_bus *video = acpi_driver_data(device); |
|
struct input_dev *input; |
|
int keycode = 0; |
|
|
|
if (!video || !video->input) |
|
return; |
|
|
|
input = video->input; |
|
|
|
switch (event) { |
|
case ACPI_VIDEO_NOTIFY_SWITCH: /* User requested a switch, |
|
* most likely via hotkey. */ |
|
keycode = KEY_SWITCHVIDEOMODE; |
|
break; |
|
|
|
case ACPI_VIDEO_NOTIFY_PROBE: /* User plugged in or removed a video |
|
* connector. */ |
|
acpi_video_device_enumerate(video); |
|
acpi_video_device_rebind(video); |
|
keycode = KEY_SWITCHVIDEOMODE; |
|
break; |
|
|
|
case ACPI_VIDEO_NOTIFY_CYCLE: /* Cycle Display output hotkey pressed. */ |
|
keycode = KEY_SWITCHVIDEOMODE; |
|
break; |
|
case ACPI_VIDEO_NOTIFY_NEXT_OUTPUT: /* Next Display output hotkey pressed. */ |
|
keycode = KEY_VIDEO_NEXT; |
|
break; |
|
case ACPI_VIDEO_NOTIFY_PREV_OUTPUT: /* previous Display output hotkey pressed. */ |
|
keycode = KEY_VIDEO_PREV; |
|
break; |
|
|
|
default: |
|
acpi_handle_debug(device->handle, "Unsupported event [0x%x]\n", |
|
event); |
|
break; |
|
} |
|
|
|
if (acpi_notifier_call_chain(device, event, 0)) |
|
/* Something vetoed the keypress. */ |
|
keycode = 0; |
|
|
|
if (keycode && (report_key_events & REPORT_OUTPUT_KEY_EVENTS)) { |
|
input_report_key(input, keycode, 1); |
|
input_sync(input); |
|
input_report_key(input, keycode, 0); |
|
input_sync(input); |
|
} |
|
|
|
return; |
|
} |
|
|
|
static void brightness_switch_event(struct acpi_video_device *video_device, |
|
u32 event) |
|
{ |
|
if (!brightness_switch_enabled) |
|
return; |
|
|
|
video_device->switch_brightness_event = event; |
|
schedule_delayed_work(&video_device->switch_brightness_work, HZ / 10); |
|
} |
|
|
|
static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data) |
|
{ |
|
struct acpi_video_device *video_device = data; |
|
struct acpi_device *device = NULL; |
|
struct acpi_video_bus *bus; |
|
struct input_dev *input; |
|
int keycode = 0; |
|
|
|
if (!video_device) |
|
return; |
|
|
|
device = video_device->dev; |
|
bus = video_device->video; |
|
input = bus->input; |
|
|
|
if (hw_changes_brightness > 0) { |
|
if (video_device->backlight) |
|
backlight_force_update(video_device->backlight, |
|
BACKLIGHT_UPDATE_HOTKEY); |
|
acpi_notifier_call_chain(device, event, 0); |
|
return; |
|
} |
|
|
|
switch (event) { |
|
case ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS: /* Cycle brightness */ |
|
brightness_switch_event(video_device, event); |
|
keycode = KEY_BRIGHTNESS_CYCLE; |
|
break; |
|
case ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS: /* Increase brightness */ |
|
brightness_switch_event(video_device, event); |
|
keycode = KEY_BRIGHTNESSUP; |
|
break; |
|
case ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS: /* Decrease brightness */ |
|
brightness_switch_event(video_device, event); |
|
keycode = KEY_BRIGHTNESSDOWN; |
|
break; |
|
case ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS: /* zero brightness */ |
|
brightness_switch_event(video_device, event); |
|
keycode = KEY_BRIGHTNESS_ZERO; |
|
break; |
|
case ACPI_VIDEO_NOTIFY_DISPLAY_OFF: /* display device off */ |
|
brightness_switch_event(video_device, event); |
|
keycode = KEY_DISPLAY_OFF; |
|
break; |
|
default: |
|
acpi_handle_debug(handle, "Unsupported event [0x%x]\n", event); |
|
break; |
|
} |
|
|
|
acpi_notifier_call_chain(device, event, 0); |
|
|
|
if (keycode && (report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS)) { |
|
input_report_key(input, keycode, 1); |
|
input_sync(input); |
|
input_report_key(input, keycode, 0); |
|
input_sync(input); |
|
} |
|
|
|
return; |
|
} |
|
|
|
static int acpi_video_resume(struct notifier_block *nb, |
|
unsigned long val, void *ign) |
|
{ |
|
struct acpi_video_bus *video; |
|
struct acpi_video_device *video_device; |
|
int i; |
|
|
|
switch (val) { |
|
case PM_HIBERNATION_PREPARE: |
|
case PM_SUSPEND_PREPARE: |
|
case PM_RESTORE_PREPARE: |
|
return NOTIFY_DONE; |
|
} |
|
|
|
video = container_of(nb, struct acpi_video_bus, pm_nb); |
|
|
|
dev_info(&video->device->dev, "Restoring backlight state\n"); |
|
|
|
for (i = 0; i < video->attached_count; i++) { |
|
video_device = video->attached_array[i].bind_info; |
|
if (video_device && video_device->brightness) |
|
acpi_video_device_lcd_set_level(video_device, |
|
video_device->brightness->curr); |
|
} |
|
|
|
return NOTIFY_OK; |
|
} |
|
|
|
static acpi_status |
|
acpi_video_bus_match(acpi_handle handle, u32 level, void *context, |
|
void **return_value) |
|
{ |
|
struct acpi_device *device = context; |
|
struct acpi_device *sibling; |
|
int result; |
|
|
|
if (handle == device->handle) |
|
return AE_CTRL_TERMINATE; |
|
|
|
result = acpi_bus_get_device(handle, &sibling); |
|
if (result) |
|
return AE_OK; |
|
|
|
if (!strcmp(acpi_device_name(sibling), ACPI_VIDEO_BUS_NAME)) |
|
return AE_ALREADY_EXISTS; |
|
|
|
return AE_OK; |
|
} |
|
|
|
static void acpi_video_dev_register_backlight(struct acpi_video_device *device) |
|
{ |
|
struct backlight_properties props; |
|
struct pci_dev *pdev; |
|
acpi_handle acpi_parent; |
|
struct device *parent = NULL; |
|
int result; |
|
static int count; |
|
char *name; |
|
|
|
result = acpi_video_init_brightness(device); |
|
if (result) |
|
return; |
|
|
|
if (disable_backlight_sysfs_if > 0) |
|
return; |
|
|
|
name = kasprintf(GFP_KERNEL, "acpi_video%d", count); |
|
if (!name) |
|
return; |
|
count++; |
|
|
|
acpi_get_parent(device->dev->handle, &acpi_parent); |
|
|
|
pdev = acpi_get_pci_dev(acpi_parent); |
|
if (pdev) { |
|
parent = &pdev->dev; |
|
pci_dev_put(pdev); |
|
} |
|
|
|
memset(&props, 0, sizeof(struct backlight_properties)); |
|
props.type = BACKLIGHT_FIRMWARE; |
|
props.max_brightness = |
|
device->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1; |
|
device->backlight = backlight_device_register(name, |
|
parent, |
|
device, |
|
&acpi_backlight_ops, |
|
&props); |
|
kfree(name); |
|
if (IS_ERR(device->backlight)) { |
|
device->backlight = NULL; |
|
return; |
|
} |
|
|
|
/* |
|
* Save current brightness level in case we have to restore it |
|
* before acpi_video_device_lcd_set_level() is called next time. |
|
*/ |
|
device->backlight->props.brightness = |
|
acpi_video_get_brightness(device->backlight); |
|
|
|
device->cooling_dev = thermal_cooling_device_register("LCD", |
|
device->dev, &video_cooling_ops); |
|
if (IS_ERR(device->cooling_dev)) { |
|
/* |
|
* Set cooling_dev to NULL so we don't crash trying to free it. |
|
* Also, why the hell we are returning early and not attempt to |
|
* register video output if cooling device registration failed? |
|
* -- dtor |
|
*/ |
|
device->cooling_dev = NULL; |
|
return; |
|
} |
|
|
|
dev_info(&device->dev->dev, "registered as cooling_device%d\n", |
|
device->cooling_dev->id); |
|
result = sysfs_create_link(&device->dev->dev.kobj, |
|
&device->cooling_dev->device.kobj, |
|
"thermal_cooling"); |
|
if (result) |
|
pr_info("sysfs link creation failed\n"); |
|
|
|
result = sysfs_create_link(&device->cooling_dev->device.kobj, |
|
&device->dev->dev.kobj, "device"); |
|
if (result) |
|
pr_info("Reverse sysfs link creation failed\n"); |
|
} |
|
|
|
static void acpi_video_run_bcl_for_osi(struct acpi_video_bus *video) |
|
{ |
|
struct acpi_video_device *dev; |
|
union acpi_object *levels; |
|
|
|
mutex_lock(&video->device_list_lock); |
|
list_for_each_entry(dev, &video->video_device_list, entry) { |
|
if (!acpi_video_device_lcd_query_levels(dev->dev->handle, &levels)) |
|
kfree(levels); |
|
} |
|
mutex_unlock(&video->device_list_lock); |
|
} |
|
|
|
static bool acpi_video_should_register_backlight(struct acpi_video_device *dev) |
|
{ |
|
/* |
|
* Do not create backlight device for video output |
|
* device that is not in the enumerated list. |
|
*/ |
|
if (!acpi_video_device_in_dod(dev)) { |
|
dev_dbg(&dev->dev->dev, "not in _DOD list, ignore\n"); |
|
return false; |
|
} |
|
|
|
if (only_lcd) |
|
return dev->flags.lcd; |
|
return true; |
|
} |
|
|
|
static int acpi_video_bus_register_backlight(struct acpi_video_bus *video) |
|
{ |
|
struct acpi_video_device *dev; |
|
|
|
if (video->backlight_registered) |
|
return 0; |
|
|
|
acpi_video_run_bcl_for_osi(video); |
|
|
|
if (acpi_video_get_backlight_type() != acpi_backlight_video) |
|
return 0; |
|
|
|
mutex_lock(&video->device_list_lock); |
|
list_for_each_entry(dev, &video->video_device_list, entry) { |
|
if (acpi_video_should_register_backlight(dev)) |
|
acpi_video_dev_register_backlight(dev); |
|
} |
|
mutex_unlock(&video->device_list_lock); |
|
|
|
video->backlight_registered = true; |
|
|
|
video->pm_nb.notifier_call = acpi_video_resume; |
|
video->pm_nb.priority = 0; |
|
return register_pm_notifier(&video->pm_nb); |
|
} |
|
|
|
static void acpi_video_dev_unregister_backlight(struct acpi_video_device *device) |
|
{ |
|
if (device->backlight) { |
|
backlight_device_unregister(device->backlight); |
|
device->backlight = NULL; |
|
} |
|
if (device->brightness) { |
|
kfree(device->brightness->levels); |
|
kfree(device->brightness); |
|
device->brightness = NULL; |
|
} |
|
if (device->cooling_dev) { |
|
sysfs_remove_link(&device->dev->dev.kobj, "thermal_cooling"); |
|
sysfs_remove_link(&device->cooling_dev->device.kobj, "device"); |
|
thermal_cooling_device_unregister(device->cooling_dev); |
|
device->cooling_dev = NULL; |
|
} |
|
} |
|
|
|
static int acpi_video_bus_unregister_backlight(struct acpi_video_bus *video) |
|
{ |
|
struct acpi_video_device *dev; |
|
int error; |
|
|
|
if (!video->backlight_registered) |
|
return 0; |
|
|
|
error = unregister_pm_notifier(&video->pm_nb); |
|
|
|
mutex_lock(&video->device_list_lock); |
|
list_for_each_entry(dev, &video->video_device_list, entry) |
|
acpi_video_dev_unregister_backlight(dev); |
|
mutex_unlock(&video->device_list_lock); |
|
|
|
video->backlight_registered = false; |
|
|
|
return error; |
|
} |
|
|
|
static void acpi_video_dev_add_notify_handler(struct acpi_video_device *device) |
|
{ |
|
acpi_status status; |
|
struct acpi_device *adev = device->dev; |
|
|
|
status = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY, |
|
acpi_video_device_notify, device); |
|
if (ACPI_FAILURE(status)) |
|
dev_err(&adev->dev, "Error installing notify handler\n"); |
|
else |
|
device->flags.notify = 1; |
|
} |
|
|
|
static int acpi_video_bus_add_notify_handler(struct acpi_video_bus *video) |
|
{ |
|
struct input_dev *input; |
|
struct acpi_video_device *dev; |
|
int error; |
|
|
|
video->input = input = input_allocate_device(); |
|
if (!input) { |
|
error = -ENOMEM; |
|
goto out; |
|
} |
|
|
|
error = acpi_video_bus_start_devices(video); |
|
if (error) |
|
goto err_free_input; |
|
|
|
snprintf(video->phys, sizeof(video->phys), |
|
"%s/video/input0", acpi_device_hid(video->device)); |
|
|
|
input->name = acpi_device_name(video->device); |
|
input->phys = video->phys; |
|
input->id.bustype = BUS_HOST; |
|
input->id.product = 0x06; |
|
input->dev.parent = &video->device->dev; |
|
input->evbit[0] = BIT(EV_KEY); |
|
set_bit(KEY_SWITCHVIDEOMODE, input->keybit); |
|
set_bit(KEY_VIDEO_NEXT, input->keybit); |
|
set_bit(KEY_VIDEO_PREV, input->keybit); |
|
set_bit(KEY_BRIGHTNESS_CYCLE, input->keybit); |
|
set_bit(KEY_BRIGHTNESSUP, input->keybit); |
|
set_bit(KEY_BRIGHTNESSDOWN, input->keybit); |
|
set_bit(KEY_BRIGHTNESS_ZERO, input->keybit); |
|
set_bit(KEY_DISPLAY_OFF, input->keybit); |
|
|
|
error = input_register_device(input); |
|
if (error) |
|
goto err_stop_dev; |
|
|
|
mutex_lock(&video->device_list_lock); |
|
list_for_each_entry(dev, &video->video_device_list, entry) |
|
acpi_video_dev_add_notify_handler(dev); |
|
mutex_unlock(&video->device_list_lock); |
|
|
|
return 0; |
|
|
|
err_stop_dev: |
|
acpi_video_bus_stop_devices(video); |
|
err_free_input: |
|
input_free_device(input); |
|
video->input = NULL; |
|
out: |
|
return error; |
|
} |
|
|
|
static void acpi_video_dev_remove_notify_handler(struct acpi_video_device *dev) |
|
{ |
|
if (dev->flags.notify) { |
|
acpi_remove_notify_handler(dev->dev->handle, ACPI_DEVICE_NOTIFY, |
|
acpi_video_device_notify); |
|
dev->flags.notify = 0; |
|
} |
|
} |
|
|
|
static void acpi_video_bus_remove_notify_handler(struct acpi_video_bus *video) |
|
{ |
|
struct acpi_video_device *dev; |
|
|
|
mutex_lock(&video->device_list_lock); |
|
list_for_each_entry(dev, &video->video_device_list, entry) |
|
acpi_video_dev_remove_notify_handler(dev); |
|
mutex_unlock(&video->device_list_lock); |
|
|
|
acpi_video_bus_stop_devices(video); |
|
input_unregister_device(video->input); |
|
video->input = NULL; |
|
} |
|
|
|
static int acpi_video_bus_put_devices(struct acpi_video_bus *video) |
|
{ |
|
struct acpi_video_device *dev, *next; |
|
|
|
mutex_lock(&video->device_list_lock); |
|
list_for_each_entry_safe(dev, next, &video->video_device_list, entry) { |
|
list_del(&dev->entry); |
|
kfree(dev); |
|
} |
|
mutex_unlock(&video->device_list_lock); |
|
|
|
return 0; |
|
} |
|
|
|
static int instance; |
|
|
|
static int acpi_video_bus_add(struct acpi_device *device) |
|
{ |
|
struct acpi_video_bus *video; |
|
int error; |
|
acpi_status status; |
|
|
|
status = acpi_walk_namespace(ACPI_TYPE_DEVICE, |
|
device->parent->handle, 1, |
|
acpi_video_bus_match, NULL, |
|
device, NULL); |
|
if (status == AE_ALREADY_EXISTS) { |
|
pr_info(FW_BUG |
|
"Duplicate ACPI video bus devices for the" |
|
" same VGA controller, please try module " |
|
"parameter \"video.allow_duplicates=1\"" |
|
"if the current driver doesn't work.\n"); |
|
if (!allow_duplicates) |
|
return -ENODEV; |
|
} |
|
|
|
video = kzalloc(sizeof(struct acpi_video_bus), GFP_KERNEL); |
|
if (!video) |
|
return -ENOMEM; |
|
|
|
/* a hack to fix the duplicate name "VID" problem on T61 */ |
|
if (!strcmp(device->pnp.bus_id, "VID")) { |
|
if (instance) |
|
device->pnp.bus_id[3] = '0' + instance; |
|
instance++; |
|
} |
|
/* a hack to fix the duplicate name "VGA" problem on Pa 3553 */ |
|
if (!strcmp(device->pnp.bus_id, "VGA")) { |
|
if (instance) |
|
device->pnp.bus_id[3] = '0' + instance; |
|
instance++; |
|
} |
|
|
|
video->device = device; |
|
strcpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME); |
|
strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS); |
|
device->driver_data = video; |
|
|
|
acpi_video_bus_find_cap(video); |
|
error = acpi_video_bus_check(video); |
|
if (error) |
|
goto err_free_video; |
|
|
|
mutex_init(&video->device_list_lock); |
|
INIT_LIST_HEAD(&video->video_device_list); |
|
|
|
error = acpi_video_bus_get_devices(video, device); |
|
if (error) |
|
goto err_put_video; |
|
|
|
pr_info("%s [%s] (multi-head: %s rom: %s post: %s)\n", |
|
ACPI_VIDEO_DEVICE_NAME, acpi_device_bid(device), |
|
video->flags.multihead ? "yes" : "no", |
|
video->flags.rom ? "yes" : "no", |
|
video->flags.post ? "yes" : "no"); |
|
mutex_lock(&video_list_lock); |
|
list_add_tail(&video->entry, &video_bus_head); |
|
mutex_unlock(&video_list_lock); |
|
|
|
acpi_video_bus_register_backlight(video); |
|
acpi_video_bus_add_notify_handler(video); |
|
|
|
return 0; |
|
|
|
err_put_video: |
|
acpi_video_bus_put_devices(video); |
|
kfree(video->attached_array); |
|
err_free_video: |
|
kfree(video); |
|
device->driver_data = NULL; |
|
|
|
return error; |
|
} |
|
|
|
static int acpi_video_bus_remove(struct acpi_device *device) |
|
{ |
|
struct acpi_video_bus *video = NULL; |
|
|
|
|
|
if (!device || !acpi_driver_data(device)) |
|
return -EINVAL; |
|
|
|
video = acpi_driver_data(device); |
|
|
|
acpi_video_bus_remove_notify_handler(video); |
|
acpi_video_bus_unregister_backlight(video); |
|
acpi_video_bus_put_devices(video); |
|
|
|
mutex_lock(&video_list_lock); |
|
list_del(&video->entry); |
|
mutex_unlock(&video_list_lock); |
|
|
|
kfree(video->attached_array); |
|
kfree(video); |
|
|
|
return 0; |
|
} |
|
|
|
static int __init is_i740(struct pci_dev *dev) |
|
{ |
|
if (dev->device == 0x00D1) |
|
return 1; |
|
if (dev->device == 0x7000) |
|
return 1; |
|
return 0; |
|
} |
|
|
|
static int __init intel_opregion_present(void) |
|
{ |
|
int opregion = 0; |
|
struct pci_dev *dev = NULL; |
|
u32 address; |
|
|
|
for_each_pci_dev(dev) { |
|
if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA) |
|
continue; |
|
if (dev->vendor != PCI_VENDOR_ID_INTEL) |
|
continue; |
|
/* We don't want to poke around undefined i740 registers */ |
|
if (is_i740(dev)) |
|
continue; |
|
pci_read_config_dword(dev, 0xfc, &address); |
|
if (!address) |
|
continue; |
|
opregion = 1; |
|
} |
|
return opregion; |
|
} |
|
|
|
/* Check if the chassis-type indicates there is no builtin LCD panel */ |
|
static bool dmi_is_desktop(void) |
|
{ |
|
const char *chassis_type; |
|
unsigned long type; |
|
|
|
chassis_type = dmi_get_system_info(DMI_CHASSIS_TYPE); |
|
if (!chassis_type) |
|
return false; |
|
|
|
if (kstrtoul(chassis_type, 10, &type) != 0) |
|
return false; |
|
|
|
switch (type) { |
|
case 0x03: /* Desktop */ |
|
case 0x04: /* Low Profile Desktop */ |
|
case 0x05: /* Pizza Box */ |
|
case 0x06: /* Mini Tower */ |
|
case 0x07: /* Tower */ |
|
case 0x10: /* Lunch Box */ |
|
case 0x11: /* Main Server Chassis */ |
|
return true; |
|
} |
|
|
|
return false; |
|
} |
|
|
|
int acpi_video_register(void) |
|
{ |
|
int ret = 0; |
|
|
|
mutex_lock(®ister_count_mutex); |
|
if (register_count) { |
|
/* |
|
* if the function of acpi_video_register is already called, |
|
* don't register the acpi_video_bus again and return no error. |
|
*/ |
|
goto leave; |
|
} |
|
|
|
/* |
|
* We're seeing a lot of bogus backlight interfaces on newer machines |
|
* without a LCD such as desktops, servers and HDMI sticks. Checking |
|
* the lcd flag fixes this, so enable this on any machines which are |
|
* win8 ready (where we also prefer the native backlight driver, so |
|
* normally the acpi_video code should not register there anyways). |
|
*/ |
|
if (only_lcd == -1) { |
|
if (dmi_is_desktop() && acpi_osi_is_win8()) |
|
only_lcd = true; |
|
else |
|
only_lcd = false; |
|
} |
|
|
|
dmi_check_system(video_dmi_table); |
|
|
|
ret = acpi_bus_register_driver(&acpi_video_bus); |
|
if (ret) |
|
goto leave; |
|
|
|
/* |
|
* When the acpi_video_bus is loaded successfully, increase |
|
* the counter reference. |
|
*/ |
|
register_count = 1; |
|
|
|
leave: |
|
mutex_unlock(®ister_count_mutex); |
|
return ret; |
|
} |
|
EXPORT_SYMBOL(acpi_video_register); |
|
|
|
void acpi_video_unregister(void) |
|
{ |
|
mutex_lock(®ister_count_mutex); |
|
if (register_count) { |
|
acpi_bus_unregister_driver(&acpi_video_bus); |
|
register_count = 0; |
|
} |
|
mutex_unlock(®ister_count_mutex); |
|
} |
|
EXPORT_SYMBOL(acpi_video_unregister); |
|
|
|
void acpi_video_unregister_backlight(void) |
|
{ |
|
struct acpi_video_bus *video; |
|
|
|
mutex_lock(®ister_count_mutex); |
|
if (register_count) { |
|
mutex_lock(&video_list_lock); |
|
list_for_each_entry(video, &video_bus_head, entry) |
|
acpi_video_bus_unregister_backlight(video); |
|
mutex_unlock(&video_list_lock); |
|
} |
|
mutex_unlock(®ister_count_mutex); |
|
} |
|
|
|
bool acpi_video_handles_brightness_key_presses(void) |
|
{ |
|
bool have_video_busses; |
|
|
|
mutex_lock(&video_list_lock); |
|
have_video_busses = !list_empty(&video_bus_head); |
|
mutex_unlock(&video_list_lock); |
|
|
|
return have_video_busses && |
|
(report_key_events & REPORT_BRIGHTNESS_KEY_EVENTS); |
|
} |
|
EXPORT_SYMBOL(acpi_video_handles_brightness_key_presses); |
|
|
|
/* |
|
* This is kind of nasty. Hardware using Intel chipsets may require |
|
* the video opregion code to be run first in order to initialise |
|
* state before any ACPI video calls are made. To handle this we defer |
|
* registration of the video class until the opregion code has run. |
|
*/ |
|
|
|
static int __init acpi_video_init(void) |
|
{ |
|
/* |
|
* Let the module load even if ACPI is disabled (e.g. due to |
|
* a broken BIOS) so that i915.ko can still be loaded on such |
|
* old systems without an AcpiOpRegion. |
|
* |
|
* acpi_video_register() will report -ENODEV later as well due |
|
* to acpi_disabled when i915.ko tries to register itself afterwards. |
|
*/ |
|
if (acpi_disabled) |
|
return 0; |
|
|
|
if (intel_opregion_present()) |
|
return 0; |
|
|
|
return acpi_video_register(); |
|
} |
|
|
|
static void __exit acpi_video_exit(void) |
|
{ |
|
acpi_video_detect_exit(); |
|
acpi_video_unregister(); |
|
|
|
return; |
|
} |
|
|
|
module_init(acpi_video_init); |
|
module_exit(acpi_video_exit);
|
|
|