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kernel-fxtec-pro1x/drivers/acpi/acpi_video.c
Kees Cook 6da2ec5605 treewide: kmalloc() -> kmalloc_array() 
The kmalloc() function has a 2-factor argument form, kmalloc_array(). This
patch replaces cases of:

        kmalloc(a * b, gfp)

with:
        kmalloc_array(a * b, gfp)

as well as handling cases of:

        kmalloc(a * b * c, gfp)

with:

        kmalloc(array3_size(a, b, c), gfp)

as it's slightly less ugly than:

        kmalloc_array(array_size(a, b), c, gfp)

This does, however, attempt to ignore constant size factors like:

        kmalloc(4 * 1024, gfp)

though any constants defined via macros get caught up in the conversion.

Any factors with a sizeof() of "unsigned char", "char", and "u8" were
dropped, since they're redundant.

The tools/ directory was manually excluded, since it has its own
implementation of kmalloc().

The Coccinelle script used for this was:

// Fix redundant parens around sizeof().
@@
type TYPE;
expression THING, E;
@@

(
  kmalloc(
-	(sizeof(TYPE)) * E
+	sizeof(TYPE) * E
  , ...)
|
  kmalloc(
-	(sizeof(THING)) * E
+	sizeof(THING) * E
  , ...)
)

// Drop single-byte sizes and redundant parens.
@@
expression COUNT;
typedef u8;
typedef __u8;
@@

(
  kmalloc(
-	sizeof(u8) * (COUNT)
+	COUNT
  , ...)
|
  kmalloc(
-	sizeof(__u8) * (COUNT)
+	COUNT
  , ...)
|
  kmalloc(
-	sizeof(char) * (COUNT)
+	COUNT
  , ...)
|
  kmalloc(
-	sizeof(unsigned char) * (COUNT)
+	COUNT
  , ...)
|
  kmalloc(
-	sizeof(u8) * COUNT
+	COUNT
  , ...)
|
  kmalloc(
-	sizeof(__u8) * COUNT
+	COUNT
  , ...)
|
  kmalloc(
-	sizeof(char) * COUNT
+	COUNT
  , ...)
|
  kmalloc(
-	sizeof(unsigned char) * COUNT
+	COUNT
  , ...)
)

// 2-factor product with sizeof(type/expression) and identifier or constant.
@@
type TYPE;
expression THING;
identifier COUNT_ID;
constant COUNT_CONST;
@@

(
- kmalloc
+ kmalloc_array
  (
-	sizeof(TYPE) * (COUNT_ID)
+	COUNT_ID, sizeof(TYPE)
  , ...)
|
- kmalloc
+ kmalloc_array
  (
-	sizeof(TYPE) * COUNT_ID
+	COUNT_ID, sizeof(TYPE)
  , ...)
|
- kmalloc
+ kmalloc_array
  (
-	sizeof(TYPE) * (COUNT_CONST)
+	COUNT_CONST, sizeof(TYPE)
  , ...)
|
- kmalloc
+ kmalloc_array
  (
-	sizeof(TYPE) * COUNT_CONST
+	COUNT_CONST, sizeof(TYPE)
  , ...)
|
- kmalloc
+ kmalloc_array
  (
-	sizeof(THING) * (COUNT_ID)
+	COUNT_ID, sizeof(THING)
  , ...)
|
- kmalloc
+ kmalloc_array
  (
-	sizeof(THING) * COUNT_ID
+	COUNT_ID, sizeof(THING)
  , ...)
|
- kmalloc
+ kmalloc_array
  (
-	sizeof(THING) * (COUNT_CONST)
+	COUNT_CONST, sizeof(THING)
  , ...)
|
- kmalloc
+ kmalloc_array
  (
-	sizeof(THING) * COUNT_CONST
+	COUNT_CONST, sizeof(THING)
  , ...)
)

// 2-factor product, only identifiers.
@@
identifier SIZE, COUNT;
@@

- kmalloc
+ kmalloc_array
  (
-	SIZE * COUNT
+	COUNT, SIZE
  , ...)

// 3-factor product with 1 sizeof(type) or sizeof(expression), with
// redundant parens removed.
@@
expression THING;
identifier STRIDE, COUNT;
type TYPE;
@@

(
  kmalloc(
-	sizeof(TYPE) * (COUNT) * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  kmalloc(
-	sizeof(TYPE) * (COUNT) * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  kmalloc(
-	sizeof(TYPE) * COUNT * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  kmalloc(
-	sizeof(TYPE) * COUNT * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  kmalloc(
-	sizeof(THING) * (COUNT) * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  kmalloc(
-	sizeof(THING) * (COUNT) * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  kmalloc(
-	sizeof(THING) * COUNT * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  kmalloc(
-	sizeof(THING) * COUNT * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
)

// 3-factor product with 2 sizeof(variable), with redundant parens removed.
@@
expression THING1, THING2;
identifier COUNT;
type TYPE1, TYPE2;
@@

(
  kmalloc(
-	sizeof(TYPE1) * sizeof(TYPE2) * COUNT
+	array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
  , ...)
|
  kmalloc(
-	sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
  , ...)
|
  kmalloc(
-	sizeof(THING1) * sizeof(THING2) * COUNT
+	array3_size(COUNT, sizeof(THING1), sizeof(THING2))
  , ...)
|
  kmalloc(
-	sizeof(THING1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(THING1), sizeof(THING2))
  , ...)
|
  kmalloc(
-	sizeof(TYPE1) * sizeof(THING2) * COUNT
+	array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
  , ...)
|
  kmalloc(
-	sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
  , ...)
)

// 3-factor product, only identifiers, with redundant parens removed.
@@
identifier STRIDE, SIZE, COUNT;
@@

(
  kmalloc(
-	(COUNT) * STRIDE * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kmalloc(
-	COUNT * (STRIDE) * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kmalloc(
-	COUNT * STRIDE * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kmalloc(
-	(COUNT) * (STRIDE) * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kmalloc(
-	COUNT * (STRIDE) * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kmalloc(
-	(COUNT) * STRIDE * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kmalloc(
-	(COUNT) * (STRIDE) * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kmalloc(
-	COUNT * STRIDE * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
)

// Any remaining multi-factor products, first at least 3-factor products,
// when they're not all constants...
@@
expression E1, E2, E3;
constant C1, C2, C3;
@@

(
  kmalloc(C1 * C2 * C3, ...)
|
  kmalloc(
-	(E1) * E2 * E3
+	array3_size(E1, E2, E3)
  , ...)
|
  kmalloc(
-	(E1) * (E2) * E3
+	array3_size(E1, E2, E3)
  , ...)
|
  kmalloc(
-	(E1) * (E2) * (E3)
+	array3_size(E1, E2, E3)
  , ...)
|
  kmalloc(
-	E1 * E2 * E3
+	array3_size(E1, E2, E3)
  , ...)
)

// And then all remaining 2 factors products when they're not all constants,
// keeping sizeof() as the second factor argument.
@@
expression THING, E1, E2;
type TYPE;
constant C1, C2, C3;
@@

(
  kmalloc(sizeof(THING) * C2, ...)
|
  kmalloc(sizeof(TYPE) * C2, ...)
|
  kmalloc(C1 * C2 * C3, ...)
|
  kmalloc(C1 * C2, ...)
|
- kmalloc
+ kmalloc_array
  (
-	sizeof(TYPE) * (E2)
+	E2, sizeof(TYPE)
  , ...)
|
- kmalloc
+ kmalloc_array
  (
-	sizeof(TYPE) * E2
+	E2, sizeof(TYPE)
  , ...)
|
- kmalloc
+ kmalloc_array
  (
-	sizeof(THING) * (E2)
+	E2, sizeof(THING)
  , ...)
|
- kmalloc
+ kmalloc_array
  (
-	sizeof(THING) * E2
+	E2, sizeof(THING)
  , ...)
|
- kmalloc
+ kmalloc_array
  (
-	(E1) * E2
+	E1, E2
  , ...)
|
- kmalloc
+ kmalloc_array
  (
-	(E1) * (E2)
+	E1, E2
  , ...)
|
- kmalloc
+ kmalloc_array
  (
-	E1 * E2
+	E1, E2
  , ...)
)

Signed-off-by: Kees Cook <keescook@chromium.org>
2018-06-12 16:19:22 -07:00

2264 lines
58 KiB
C
Raw Blame History

/*
* video.c - ACPI Video Driver
*
* Copyright (C) 2004 Luming Yu <luming.yu@intel.com>
* Copyright (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
* Copyright (C) 2006 Thomas Tuttle <linux-kernel@ttuttle.net>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/input.h>
#include <linux/backlight.h>
#include <linux/thermal.h>
#include <linux/sort.h>
#include <linux/pci.h>
#include <linux/pci_ids.h>
#include <linux/slab.h>
#include <linux/dmi.h>
#include <linux/suspend.h>
#include <linux/acpi.h>
#include <acpi/video.h>
#include <linux/uaccess.h>
#define PREFIX "ACPI: "
#define ACPI_VIDEO_BUS_NAME "Video Bus"
#define ACPI_VIDEO_DEVICE_NAME "Video Device"
#define MAX_NAME_LEN 20
#define _COMPONENT ACPI_VIDEO_COMPONENT
ACPI_MODULE_NAME("video");
MODULE_AUTHOR("Bruno Ducrot");
MODULE_DESCRIPTION("ACPI Video Driver");
MODULE_LICENSE("GPL");
static bool brightness_switch_enabled = true;
module_param(brightness_switch_enabled, bool, 0644);
/*
* By default, we don't allow duplicate ACPI video bus devices
* under the same VGA controller
*/
static bool allow_duplicates;
module_param(allow_duplicates, bool, 0644);
static int disable_backlight_sysfs_if = -1;
module_param(disable_backlight_sysfs_if, int, 0444);
#define REPORT_OUTPUT_KEY_EVENTS 0x01
#define REPORT_BRIGHTNESS_KEY_EVENTS 0x02
static int report_key_events = -1;
module_param(report_key_events, int, 0644);
MODULE_PARM_DESC(report_key_events,
"0: none, 1: output changes, 2: brightness changes, 3: all");
/*
* Whether the struct acpi_video_device_attrib::device_id_scheme bit should be
* assumed even if not actually set.
*/
static bool device_id_scheme = false;
module_param(device_id_scheme, bool, 0444);
static int only_lcd = -1;
module_param(only_lcd, int, 0444);
static int register_count;
static DEFINE_MUTEX(register_count_mutex);
static DEFINE_MUTEX(video_list_lock);
static LIST_HEAD(video_bus_head);
static int acpi_video_bus_add(struct acpi_device *device);
static int acpi_video_bus_remove(struct acpi_device *device);
static void acpi_video_bus_notify(struct acpi_device *device, u32 event);
void acpi_video_detect_exit(void);
/*
* Indices in the _BCL method response: the first two items are special,
* the rest are all supported levels.
*
* See page 575 of the ACPI spec 3.0
*/
enum acpi_video_level_idx {
ACPI_VIDEO_AC_LEVEL, /* level when machine has full power */
ACPI_VIDEO_BATTERY_LEVEL, /* level when machine is on batteries */
ACPI_VIDEO_FIRST_LEVEL, /* actual supported levels begin here */
};
static const struct acpi_device_id video_device_ids[] = {
{ACPI_VIDEO_HID, 0},
{"", 0},
};
MODULE_DEVICE_TABLE(acpi, video_device_ids);
static struct acpi_driver acpi_video_bus = {
.name = "video",
.class = ACPI_VIDEO_CLASS,
.ids = video_device_ids,
.ops = {
.add = acpi_video_bus_add,
.remove = acpi_video_bus_remove,
.notify = acpi_video_bus_notify,
},
};
struct acpi_video_bus_flags {
u8 multihead:1; /* can switch video heads */
u8 rom:1; /* can retrieve a video rom */
u8 post:1; /* can configure the head to */
u8 reserved:5;
};
struct acpi_video_bus_cap {
u8 _DOS:1; /* Enable/Disable output switching */
u8 _DOD:1; /* Enumerate all devices attached to display adapter */
u8 _ROM:1; /* Get ROM Data */
u8 _GPD:1; /* Get POST Device */
u8 _SPD:1; /* Set POST Device */
u8 _VPO:1; /* Video POST Options */
u8 reserved:2;
};
struct acpi_video_device_attrib {
u32 display_index:4; /* A zero-based instance of the Display */
u32 display_port_attachment:4; /* This field differentiates the display type */
u32 display_type:4; /* Describe the specific type in use */
u32 vendor_specific:4; /* Chipset Vendor Specific */
u32 bios_can_detect:1; /* BIOS can detect the device */
u32 depend_on_vga:1; /* Non-VGA output device whose power is related to
the VGA device. */
u32 pipe_id:3; /* For VGA multiple-head devices. */
u32 reserved:10; /* Must be 0 */
/*
* The device ID might not actually follow the scheme described by this
* struct acpi_video_device_attrib. If it does, then this bit
* device_id_scheme is set; otherwise, other fields should be ignored.
*
* (but also see the global flag device_id_scheme)
*/
u32 device_id_scheme:1;
};
struct acpi_video_enumerated_device {
union {
u32 int_val;
struct acpi_video_device_attrib attrib;
} value;
struct acpi_video_device *bind_info;
};
struct acpi_video_bus {
struct acpi_device *device;
bool backlight_registered;
u8 dos_setting;
struct acpi_video_enumerated_device *attached_array;
u8 attached_count;
u8 child_count;
struct acpi_video_bus_cap cap;
struct acpi_video_bus_flags flags;
struct list_head video_device_list;
struct mutex device_list_lock; /* protects video_device_list */
struct list_head entry;
struct input_dev *input;
char phys[32]; /* for input device */
struct notifier_block pm_nb;
};
struct acpi_video_device_flags {
u8 crt:1;
u8 lcd:1;
u8 tvout:1;
u8 dvi:1;
u8 bios:1;
u8 unknown:1;
u8 notify:1;
u8 reserved:1;
};
struct acpi_video_device_cap {
u8 _ADR:1; /* Return the unique ID */
u8 _BCL:1; /* Query list of brightness control levels supported */
u8 _BCM:1; /* Set the brightness level */
u8 _BQC:1; /* Get current brightness level */
u8 _BCQ:1; /* Some buggy BIOS uses _BCQ instead of _BQC */
u8 _DDC:1; /* Return the EDID for this device */
};
struct acpi_video_device {
unsigned long device_id;
struct acpi_video_device_flags flags;
struct acpi_video_device_cap cap;
struct list_head entry;
struct delayed_work switch_brightness_work;
int switch_brightness_event;
struct acpi_video_bus *video;
struct acpi_device *dev;
struct acpi_video_device_brightness *brightness;
struct backlight_device *backlight;
struct thermal_cooling_device *cooling_dev;
};
static void acpi_video_device_notify(acpi_handle handle, u32 event, void *data);
static void acpi_video_device_rebind(struct acpi_video_bus *video);
static void acpi_video_device_bind(struct acpi_video_bus *video,
struct acpi_video_device *device);
static int acpi_video_device_enumerate(struct acpi_video_bus *video);
static int acpi_video_device_lcd_set_level(struct acpi_video_device *device,
int level);
static int acpi_video_device_lcd_get_level_current(
struct acpi_video_device *device,
unsigned long long *level, bool raw);
static int acpi_video_get_next_level(struct acpi_video_device *device,
u32 level_current, u32 event);
static void acpi_video_switch_brightness(struct work_struct *work);
/* backlight device sysfs support */
static int acpi_video_get_brightness(struct backlight_device *bd)
{
unsigned long long cur_level;
int i;
struct acpi_video_device *vd = bl_get_data(bd);
if (acpi_video_device_lcd_get_level_current(vd, &cur_level, false))
return -EINVAL;
for (i = ACPI_VIDEO_FIRST_LEVEL; i < vd->brightness->count; i++) {
if (vd->brightness->levels[i] == cur_level)
return i - ACPI_VIDEO_FIRST_LEVEL;
}
return 0;
}
static int acpi_video_set_brightness(struct backlight_device *bd)
{
int request_level = bd->props.brightness + ACPI_VIDEO_FIRST_LEVEL;
struct acpi_video_device *vd = bl_get_data(bd);
cancel_delayed_work(&vd->switch_brightness_work);
return acpi_video_device_lcd_set_level(vd,
vd->brightness->levels[request_level]);
}
static const struct backlight_ops acpi_backlight_ops = {
.get_brightness = acpi_video_get_brightness,
.update_status = acpi_video_set_brightness,
};
/* thermal cooling device callbacks */
static int video_get_max_state(struct thermal_cooling_device *cooling_dev,
unsigned long *state)
{
struct acpi_device *device = cooling_dev->devdata;
struct acpi_video_device *video = acpi_driver_data(device);
*state = video->brightness->count - ACPI_VIDEO_FIRST_LEVEL - 1;
return 0;
}
static int video_get_cur_state(struct thermal_cooling_device *cooling_dev,
unsigned long *state)
{
struct acpi_device *device = cooling_dev->devdata;
struct acpi_video_device *video = acpi_driver_data(device);
unsigned long long level;
int offset;
if (acpi_video_device_lcd_get_level_current(video, &level, false))
return -EINVAL;
for (offset = ACPI_VIDEO_FIRST_LEVEL; offset < video->brightness->count;
offset++)
if (level == video->brightness->levels[offset]) {
*state = video->brightness->count - offset - 1;
return 0;
}
return -EINVAL;
}
static int
video_set_cur_state(struct thermal_cooling_device *cooling_dev, unsigned long state)
{
struct acpi_device *device = cooling_dev->devdata;
struct acpi_video_device *video = acpi_driver_data(device);
int level;
if (state >= video->brightness->count - ACPI_VIDEO_FIRST_LEVEL)
return -EINVAL;
state = video->brightness->count - state;
level = video->brightness->levels[state - 1];
return acpi_video_device_lcd_set_level(video, level);
}
static const struct thermal_cooling_device_ops video_cooling_ops = {
.get_max_state = video_get_max_state,
.get_cur_state = video_get_cur_state,
.set_cur_state = video_set_cur_state,
};
/*
* --------------------------------------------------------------------------
* Video Management
* --------------------------------------------------------------------------
*/
static int
acpi_video_device_lcd_query_levels(acpi_handle handle,
union acpi_object **levels)
{
int status;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *obj;
*levels = NULL;
status = acpi_evaluate_object(handle, "_BCL", NULL, &buffer);
if (!ACPI_SUCCESS(status))
return status;
obj = (union acpi_object *)buffer.pointer;
if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
printk(KERN_ERR PREFIX "Invalid _BCL data\n");
status = -EFAULT;
goto err;
}
*levels = obj;
return 0;
err:
kfree(buffer.pointer);
return status;
}
static int
acpi_video_device_lcd_set_level(struct acpi_video_device *device, int level)
{
int status;
int state;
status = acpi_execute_simple_method(device->dev->handle,
"_BCM", level);
if (ACPI_FAILURE(status)) {
ACPI_ERROR((AE_INFO, "Evaluating _BCM failed"));
return -EIO;
}
device->brightness->curr = level;
for (state = ACPI_VIDEO_FIRST_LEVEL; state < device->brightness->count;
state++)
if (level == device->brightness->levels[state]) {
if (device->backlight)
device->backlight->props.brightness =
state - ACPI_VIDEO_FIRST_LEVEL;
return 0;
}
ACPI_ERROR((AE_INFO, "Current brightness invalid"));
return -EINVAL;
}
/*
* For some buggy _BQC methods, we need to add a constant value to
* the _BQC return value to get the actual current brightness level
*/
static int bqc_offset_aml_bug_workaround;
static int video_set_bqc_offset(const struct dmi_system_id *d)
{
bqc_offset_aml_bug_workaround = 9;
return 0;
}
static int video_disable_backlight_sysfs_if(
const struct dmi_system_id *d)
{
if (disable_backlight_sysfs_if == -1)
disable_backlight_sysfs_if = 1;
return 0;
}
static int video_set_device_id_scheme(const struct dmi_system_id *d)
{
device_id_scheme = true;
return 0;
}
static int video_enable_only_lcd(const struct dmi_system_id *d)
{
only_lcd = true;
return 0;
}
static int video_set_report_key_events(const struct dmi_system_id *id)
{
if (report_key_events == -1)
report_key_events = (uintptr_t)id->driver_data;
return 0;
}
static const struct dmi_system_id video_dmi_table[] = {
/*
* Broken _BQC workaround http://bugzilla.kernel.org/show_bug.cgi?id=13121
*/
{
.callback = video_set_bqc_offset,
.ident = "Acer Aspire 5720",
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5720"),
},
},
{
.callback = video_set_bqc_offset,
.ident = "Acer Aspire 5710Z",
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "Acer"),
DMI_MATCH(DMI_PRODUCT_NAME, "Aspire 5710Z"),
},
},
{
.callback = video_set_bqc_offset,
.ident = "eMachines E510",
.matches = {
DMI_MATCH(DMI_BOARD_VENDOR, "EMACHINES"),
DMI_MATCH(DMI_PRODUCT_NAME, "eMachines E510"),
},
},
{
.callback = video_set_bqc_offset,
.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 machines have a broken acpi-video interface for brightness
* control, but still need an acpi_video_device_lcd_set_level() call
* on resume to turn the backlight power on. We Enable backlight
* control on these systems, but do not register a backlight sysfs
* as brightness control does not work.
*/
{
/* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
.callback = video_disable_backlight_sysfs_if,
.ident = "Toshiba Portege R700",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R700"),
},
},
{
/* https://bugs.freedesktop.org/show_bug.cgi?id=82634 */
.callback = video_disable_backlight_sysfs_if,
.ident = "Toshiba Portege R830",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
DMI_MATCH(DMI_PRODUCT_NAME, "PORTEGE R830"),
},
},
{
/* https://bugzilla.kernel.org/show_bug.cgi?id=21012 */
.callback = video_disable_backlight_sysfs_if,
.ident = "Toshiba Satellite R830",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "TOSHIBA"),
DMI_MATCH(DMI_PRODUCT_NAME, "SATELLITE R830"),
},
},
/*
* 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"),
},
},
{}
};
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_WARNING((AE_INFO,
"%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_WARNING((AE_INFO, "Evaluating %s 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 {
printk(KERN_ERR PREFIX "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
* 1. The system BIOS should NOT automatically control the brightness
* level of the LCD when the power changes from AC to DC.
* 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_SUCCESS(acpi_video_device_lcd_query_levels(device->handle,
&obj))) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "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) {
printk(KERN_ERR "can't allocate memory\n");
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) {
printk(KERN_ERR PREFIX "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_ERROR((AE_INFO, "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_ERROR((AE_INFO,
"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 = -EINVAL;
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_DEBUG_PRINT((ACPI_DB_INFO,
"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")) {
printk(KERN_WARNING FW_BUG "_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) {
printk(KERN_WARNING 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_DEBUG_PRINT((ACPI_DB_INFO, "device_bind %d\n", 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_SUCCESS(status)) {
ACPI_EXCEPTION((AE_INFO, status, "Evaluating _DOD"));
return status;
}
dod = buffer.pointer;
if (!dod || (dod->type != ACPI_TYPE_PACKAGE)) {
ACPI_EXCEPTION((AE_INFO, status, "Invalid _DOD data"));
status = -EFAULT;
goto out;
}
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "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) {
printk(KERN_ERR PREFIX
"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_DEBUG_PRINT((ACPI_DB_INFO, "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)
printk(KERN_ERR PREFIX "Failed to switch the 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_DEBUG_PRINT((ACPI_DB_INFO,
"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;
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_DEBUG_PRINT((ACPI_DB_INFO,
"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)
printk(KERN_ERR PREFIX "Create sysfs link\n");
result = sysfs_create_link(&device->cooling_dev->device.kobj,
&device->dev->dev.kobj, "device");
if (result)
printk(KERN_ERR PREFIX "Create sysfs link\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) {
printk(KERN_WARNING 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;
printk(KERN_INFO PREFIX "%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;
}
static bool dmi_is_desktop(void)
{
const char *chassis_type;
chassis_type = dmi_get_system_info(DMI_CHASSIS_TYPE);
if (!chassis_type)
return false;
if (!strcmp(chassis_type, "3") || /* 3: Desktop */
!strcmp(chassis_type, "4") || /* 4: Low Profile Desktop */
!strcmp(chassis_type, "5") || /* 5: Pizza Box */
!strcmp(chassis_type, "6") || /* 6: Mini Tower */
!strcmp(chassis_type, "7") || /* 7: Tower */
!strcmp(chassis_type, "11")) /* 11: Main Server Chassis */
return true;
return false;
}
int acpi_video_register(void)
{
int ret = 0;
mutex_lock(&register_count_mutex);
if (register_count) {
/*
* if the function of acpi_video_register is already called,
* don't register the acpi_vide_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(&register_count_mutex);
return ret;
}
EXPORT_SYMBOL(acpi_video_register);
void acpi_video_unregister(void)
{
mutex_lock(&register_count_mutex);
if (register_count) {
acpi_bus_unregister_driver(&acpi_video_bus);
register_count = 0;
}
mutex_unlock(&register_count_mutex);
}
EXPORT_SYMBOL(acpi_video_unregister);
void acpi_video_unregister_backlight(void)
{
struct acpi_video_bus *video;
mutex_lock(&register_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(&register_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);
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