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![Hans de Goede](/assets/img/avatar_default.png)
The acpi_video code was storing the acpi_video_device as driver_data in the acpi_device children of the acpi_video_bus acpi_device. But the acpi_video driver only binds to the bus acpi_device. It uses, but does not bind to, the children. Since it is not the driver it should not be using the driver_data of the children's acpi_device-s. Since commit0d16710146
("ACPI: bus: Set driver_data to NULL every time .add() fails") the childen's driver_data ends up getting set to NULL after a driver fails to bind to the children leading to a NULL pointer deref in video_get_max_state when registering the cooling-dev: [ 3.148958] BUG: kernel NULL pointer dereference, address: 0000000000000090 <snip> [ 3.149015] Hardware name: Sony Corporation VPCSB2X9R/VAIO, BIOS R2087H4 06/15/2012 [ 3.149021] RIP: 0010:video_get_max_state+0x17/0x30 [video] <snip> [ 3.149105] Call Trace: [ 3.149110] <TASK> [ 3.149114] ? __die+0x23/0x70 [ 3.149126] ? page_fault_oops+0x171/0x4e0 [ 3.149137] ? exc_page_fault+0x7f/0x180 [ 3.149147] ? asm_exc_page_fault+0x26/0x30 [ 3.149158] ? video_get_max_state+0x17/0x30 [video 9b6f3f0d19d7b4a0e2df17a2d8b43bc19c2ed71f] [ 3.149176] ? __pfx_video_get_max_state+0x10/0x10 [video 9b6f3f0d19d7b4a0e2df17a2d8b43bc19c2ed71f] [ 3.149192] __thermal_cooling_device_register.part.0+0xf2/0x2f0 [ 3.149205] acpi_video_bus_register_backlight.part.0.isra.0+0x414/0x570 [video 9b6f3f0d19d7b4a0e2df17a2d8b43bc19c2ed71f] [ 3.149227] acpi_video_register_backlight+0x57/0x80 [video 9b6f3f0d19d7b4a0e2df17a2d8b43bc19c2ed71f] [ 3.149245] intel_acpi_video_register+0x68/0x90 [i915 1f3a758130b32ef13d301d4f8f78c7d766d57f2a] [ 3.149669] intel_display_driver_register+0x28/0x50 [i915 1f3a758130b32ef13d301d4f8f78c7d766d57f2a] [ 3.150064] i915_driver_probe+0x790/0xb90 [i915 1f3a758130b32ef13d301d4f8f78c7d766d57f2a] [ 3.150402] local_pci_probe+0x45/0xa0 [ 3.150412] pci_device_probe+0xc1/0x260 <snip> Fix this by directly using the acpi_video_device as devdata for the cooling-device, which avoids the need to set driver-data on the children at all. Fixes:0d16710146
("ACPI: bus: Set driver_data to NULL every time .add() fails") Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/9718 Cc: 6.6+ <stable@vger.kernel.org> # 6.6+ Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2287 lines
59 KiB
C
2287 lines
59 KiB
C
// 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 <luming.yu@intel.com>
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* Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
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* Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
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*/
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#define pr_fmt(fmt) "ACPI: video: " fmt
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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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#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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* 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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#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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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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* 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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static int only_lcd = -1;
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module_param(only_lcd, int, 0444);
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static bool may_report_brightness_keys;
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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 void acpi_video_bus_remove(struct acpi_device *device);
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static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data);
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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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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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},
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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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* 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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/* 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_video_device *video = cooling_dev->devdata;
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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_video_device *video = cooling_dev->devdata;
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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_video_device *video = cooling_dev->devdata;
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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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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_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",
|
|
.matches = {
|
|
DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5315"),
|
|
},
|
|
},
|
|
{
|
|
.callback = video_set_bqc_offset,
|
|
.ident = "Acer Aspire 7720",
|
|
.matches = {
|
|
DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 7720"),
|
|
},
|
|
},
|
|
|
|
/*
|
|
* Some machine's _DOD IDs don't have bit 31(Device ID Scheme) set
|
|
* but the IDs actually follow the Device ID Scheme.
|
|
*/
|
|
{
|
|
/* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
|
|
.callback = video_set_device_id_scheme,
|
|
.ident = "ESPRIMO Mobile M9410",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "ESPRIMO Mobile M9410"),
|
|
},
|
|
},
|
|
/*
|
|
* Some machines have multiple video output devices, but only the one
|
|
* that is the type of LCD can do the backlight control so we should not
|
|
* register backlight interface for other video output devices.
|
|
*/
|
|
{
|
|
/* https://bugzilla.kernel.org/show_bug.cgi?id=104121 */
|
|
.callback = video_enable_only_lcd,
|
|
.ident = "ESPRIMO Mobile M9410",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "FUJITSU SIEMENS"),
|
|
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 = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"),
|
|
},
|
|
},
|
|
{
|
|
.callback = video_set_report_key_events,
|
|
.driver_data = (void *)((uintptr_t)REPORT_BRIGHTNESS_KEY_EVENTS),
|
|
.ident = "Dell Vostro 3350",
|
|
.matches = {
|
|
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
|
|
DMI_MATCH(DMI_PRODUCT_NAME, "Vostro 3350"),
|
|
},
|
|
},
|
|
/*
|
|
* 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, void *arg)
|
|
{
|
|
struct acpi_video_bus *video = arg;
|
|
struct acpi_video_device_attrib *attribute;
|
|
struct acpi_video_device *data;
|
|
unsigned long long device_id;
|
|
acpi_status status;
|
|
int device_type;
|
|
|
|
status = acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
|
|
/* Skip devices without _ADR instead of failing. */
|
|
if (ACPI_FAILURE(status))
|
|
goto exit;
|
|
|
|
data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
|
|
if (!data) {
|
|
dev_dbg(&device->dev, "Cannot attach\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
|
|
strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
|
|
|
|
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);
|
|
|
|
if (data->cap._BCM && data->cap._BCL)
|
|
may_report_brightness_keys = true;
|
|
|
|
mutex_lock(&video->device_list_lock);
|
|
list_add_tail(&data->entry, &video->video_device_list);
|
|
mutex_unlock(&video->device_list_lock);
|
|
|
|
exit:
|
|
video->child_count++;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
}
|
|
/* Adjust 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)
|
|
{
|
|
/*
|
|
* 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);
|
|
|
|
return acpi_dev_for_each_child(device, acpi_video_bus_get_one_device, video);
|
|
}
|
|
|
|
/* acpi_video interface */
|
|
|
|
/*
|
|
* Win8 requires setting bit2 of _DOS to let firmware know it shouldn't
|
|
* perform 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(acpi_handle handle, u32 event, void *data)
|
|
{
|
|
struct acpi_device *device = data;
|
|
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);
|
|
}
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
if (keycode)
|
|
may_report_brightness_keys = true;
|
|
|
|
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);
|
|
}
|
|
}
|
|
|
|
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_POST_HIBERNATION:
|
|
case PM_POST_SUSPEND:
|
|
case PM_POST_RESTORE:
|
|
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;
|
|
}
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
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;
|
|
|
|
if (handle == device->handle)
|
|
return AE_CTRL_TERMINATE;
|
|
|
|
sibling = acpi_fetch_acpi_dev(handle);
|
|
if (!sibling)
|
|
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;
|
|
|
|
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,
|
|
&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;
|
|
|
|
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;
|
|
bool auto_detect;
|
|
int error;
|
|
acpi_status status;
|
|
|
|
status = acpi_walk_namespace(ACPI_TYPE_DEVICE,
|
|
acpi_dev_parent(device)->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;
|
|
|
|
/*
|
|
* HP ZBook Fury 16 G10 requires ACPI video's child devices have _PS0
|
|
* evaluated to have functional panel brightness control.
|
|
*/
|
|
acpi_device_fix_up_power_children(device);
|
|
|
|
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);
|
|
|
|
/*
|
|
* If backlight-type auto-detection is used then a native backlight may
|
|
* show up later and this may change the result from video to native.
|
|
* Therefor normally the userspace visible /sys/class/backlight device
|
|
* gets registered separately by the GPU driver calling
|
|
* acpi_video_register_backlight() when an internal panel is detected.
|
|
* Register the backlight now when not using auto-detection, so that
|
|
* when the kernel cmdline or DMI-quirks are used the backlight will
|
|
* get registered even if acpi_video_register_backlight() is not called.
|
|
*/
|
|
acpi_video_run_bcl_for_osi(video);
|
|
if (__acpi_video_get_backlight_type(false, &auto_detect) == acpi_backlight_video &&
|
|
!auto_detect)
|
|
acpi_video_bus_register_backlight(video);
|
|
|
|
error = acpi_video_bus_add_notify_handler(video);
|
|
if (error)
|
|
goto err_del;
|
|
|
|
error = acpi_dev_install_notify_handler(device, ACPI_DEVICE_NOTIFY,
|
|
acpi_video_bus_notify, device);
|
|
if (error)
|
|
goto err_remove;
|
|
|
|
return 0;
|
|
|
|
err_remove:
|
|
acpi_video_bus_remove_notify_handler(video);
|
|
err_del:
|
|
mutex_lock(&video_list_lock);
|
|
list_del(&video->entry);
|
|
mutex_unlock(&video_list_lock);
|
|
acpi_video_bus_unregister_backlight(video);
|
|
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 void acpi_video_bus_remove(struct acpi_device *device)
|
|
{
|
|
struct acpi_video_bus *video = NULL;
|
|
|
|
|
|
if (!device || !acpi_driver_data(device))
|
|
return;
|
|
|
|
video = acpi_driver_data(device);
|
|
|
|
acpi_dev_remove_notify_handler(device, ACPI_DEVICE_NOTIFY,
|
|
acpi_video_bus_notify);
|
|
|
|
mutex_lock(&video_list_lock);
|
|
list_del(&video->entry);
|
|
mutex_unlock(&video_list_lock);
|
|
|
|
acpi_video_bus_remove_notify_handler(video);
|
|
acpi_video_bus_unregister_backlight(video);
|
|
acpi_video_bus_put_devices(video);
|
|
|
|
kfree(video->attached_array);
|
|
kfree(video);
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* 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, enable this by default on any machines which are:
|
|
* 1. Win8 ready (where we also prefer the native backlight driver, so
|
|
* normally the acpi_video code should not register there anyways); *and*
|
|
* 2.1 Report a desktop/server DMI chassis-type, or
|
|
* 2.2 Are an ACPI-reduced-hardware platform (and thus won't use the EC for
|
|
backlight control)
|
|
*/
|
|
static bool should_check_lcd_flag(void)
|
|
{
|
|
if (!acpi_osi_is_win8())
|
|
return false;
|
|
|
|
if (dmi_is_desktop())
|
|
return true;
|
|
|
|
if (acpi_reduced_hardware())
|
|
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;
|
|
}
|
|
|
|
if (only_lcd == -1)
|
|
only_lcd = should_check_lcd_flag();
|
|
|
|
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;
|
|
may_report_brightness_keys = false;
|
|
}
|
|
mutex_unlock(®ister_count_mutex);
|
|
}
|
|
EXPORT_SYMBOL(acpi_video_unregister);
|
|
|
|
void acpi_video_register_backlight(void)
|
|
{
|
|
struct acpi_video_bus *video;
|
|
|
|
mutex_lock(&video_list_lock);
|
|
list_for_each_entry(video, &video_bus_head, entry)
|
|
acpi_video_bus_register_backlight(video);
|
|
mutex_unlock(&video_list_lock);
|
|
}
|
|
EXPORT_SYMBOL(acpi_video_register_backlight);
|
|
|
|
bool acpi_video_handles_brightness_key_presses(void)
|
|
{
|
|
return may_report_brightness_keys &&
|
|
(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_unregister();
|
|
}
|
|
|
|
module_init(acpi_video_init);
|
|
module_exit(acpi_video_exit);
|