linux/drivers/acpi/acpi_video.c
Muhammad Qasim Abdul Majeed cfc38d432d ACPI: video: Use strscpy() instead of strcpy()
Replace strcpy() with strscpy() in the ACPI backlight code.

strcpy() has been deprecated because it is generally unsafe, so help to
eliminate if from the kernel source.

Link: https://github.com/KSPP/linux/issues/88
Signed-off-by: Muhammad Qasim Abdul Majeed <qasim.majeed20@gmail.com>
Link: https://patch.msgid.link/20240703084124.11530-1-qasim.majeed20@gmail.com
[ rjw: Subject and changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2024-07-04 14:21:37 +02:00

2237 lines
58 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* 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>
*/
#define pr_fmt(fmt) "ACPI: video: " fmt
#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 ACPI_VIDEO_BUS_NAME "Video Bus"
#define ACPI_VIDEO_DEVICE_NAME "Video Device"
#define MAX_NAME_LEN 20
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);
#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");
static int hw_changes_brightness = -1;
module_param(hw_changes_brightness, int, 0644);
MODULE_PARM_DESC(hw_changes_brightness,
"Set this to 1 on buggy hw which changes the brightness itself when "
"a hotkey is pressed: -1: auto, 0: normal 1: hw-changes-brightness");
/*
* 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;
module_param(only_lcd, int, 0444);
static bool may_report_brightness_keys;
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 void acpi_video_bus_remove(struct acpi_device *device);
static void acpi_video_bus_notify(acpi_handle handle, u32 event, void *data);
/*
* 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,
},
};
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_video_device *video = cooling_dev->devdata;
*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_video_device *video = cooling_dev->devdata;
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_video_device *video = cooling_dev->devdata;
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_FAILURE(status))
return status;
obj = (union acpi_object *)buffer.pointer;
if (!obj || (obj->type != ACPI_TYPE_PACKAGE)) {
acpi_handle_info(handle, "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_handle_info(device->dev->handle, "_BCM evaluation failed\n");
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_handle_info(device->dev->handle, "Current brightness invalid\n");
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_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 int video_hw_changes_brightness(
const struct dmi_system_id *d)
{
if (hw_changes_brightness == -1)
hw_changes_brightness = 1;
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 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"),
},
},
{
.callback = video_set_report_key_events,
.driver_data = (void *)((uintptr_t)REPORT_BRIGHTNESS_KEY_EVENTS),
.ident = "COLORFUL X15 AT 23",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "COLORFUL"),
DMI_MATCH(DMI_PRODUCT_NAME, "X15 AT 23"),
},
},
/*
* 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, int 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 || (length % 128))
return -EINVAL;
arg0.integer.value = length / 128;
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_debug(device->dev->handle,
"Invalid _DDC data for length %d\n", length);
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;
}
strscpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
strscpy(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;
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;
}
for (length = 512; length > 0; length -= 128) {
status = acpi_video_device_EDID(video_device, &buffer,
length);
if (ACPI_SUCCESS(status))
break;
}
if (!length)
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++;
if (ACPI_SUCCESS(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;
strscpy(acpi_device_name(device), ACPI_VIDEO_BUS_NAME);
strscpy(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;
}
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_video_bus again and return no error.
*/
goto leave;
}
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;
may_report_brightness_keys = false;
}
mutex_unlock(&register_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);