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acpi_video.c
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/*
* video.c - ACPI Video Driver
*
* Copyright (C) 2004 Luming Yu <[email protected]>
* Copyright (C) 2004 Bruno Ducrot <[email protected]>
* Copyright (C) 2006 Thomas Tuttle <[email protected]>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* 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.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
#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 <asm/uaccess.h>
#define PREFIX "ACPI: "
#define ACPI_VIDEO_BUS_NAME "Video Bus"
#define ACPI_VIDEO_DEVICE_NAME "Video Device"
#define ACPI_VIDEO_NOTIFY_SWITCH 0x80
#define ACPI_VIDEO_NOTIFY_PROBE 0x81
#define ACPI_VIDEO_NOTIFY_CYCLE 0x82
#define ACPI_VIDEO_NOTIFY_NEXT_OUTPUT 0x83
#define ACPI_VIDEO_NOTIFY_PREV_OUTPUT 0x84
#define ACPI_VIDEO_NOTIFY_CYCLE_BRIGHTNESS 0x85
#define ACPI_VIDEO_NOTIFY_INC_BRIGHTNESS 0x86
#define ACPI_VIDEO_NOTIFY_DEC_BRIGHTNESS 0x87
#define ACPI_VIDEO_NOTIFY_ZERO_BRIGHTNESS 0x88
#define ACPI_VIDEO_NOTIFY_DISPLAY_OFF 0x89
#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 = 1;
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);
/*
* For Windows 8 systems: used to decide if video module
* should skip registering backlight interface of its own.
*/
enum {
NATIVE_BACKLIGHT_NOT_SET = -1,
NATIVE_BACKLIGHT_OFF,
NATIVE_BACKLIGHT_ON,
};
static int use_native_backlight_param = NATIVE_BACKLIGHT_NOT_SET;
module_param_named(use_native_backlight, use_native_backlight_param, int, 0444);
static int use_native_backlight_dmi = NATIVE_BACKLIGHT_NOT_SET;
static int disable_backlight_sysfs_if = -1;
module_param(disable_backlight_sysfs_if, int, 0444);
static int register_count;
static struct mutex video_list_lock;
static struct 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);
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 */
u32 device_id_scheme:1; /* Device ID Scheme */
};
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;
bool backlight_notifier_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 notifier_block backlight_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_brightness_flags {
u8 _BCL_no_ac_battery_levels:1; /* no AC/Battery levels in _BCL */
u8 _BCL_reversed:1; /* _BCL package is in a reversed order */
u8 _BQC_use_index:1; /* _BQC returns an index value */
};
struct acpi_video_device_brightness {
int curr;
int count;
int *levels;
struct acpi_video_brightness_flags flags;
};
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 const char device_decode[][30] = {
"motherboard VGA device",
"PCI VGA device",
"AGP VGA device",
"UNKNOWN",
};
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);
static bool acpi_video_use_native_backlight(void)
{
if (use_native_backlight_param != NATIVE_BACKLIGHT_NOT_SET)
return use_native_backlight_param;
else if (use_native_backlight_dmi != NATIVE_BACKLIGHT_NOT_SET)
return use_native_backlight_dmi;
return acpi_osi_is_win8();
}
bool acpi_video_verify_backlight_support(void)
{
if (acpi_video_use_native_backlight() &&
backlight_device_registered(BACKLIGHT_RAW))
return false;
return acpi_video_backlight_support();
}
EXPORT_SYMBOL_GPL(acpi_video_verify_backlight_support);
/* 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 = 2; i < vd->brightness->count; i++) {
if (vd->brightness->levels[i] == cur_level)
/*
* The first two entries are special - see page 575
* of the ACPI spec 3.0
*/
return i - 2;
}
return 0;
}
static int acpi_video_set_brightness(struct backlight_device *bd)
{
int request_level = bd->props.brightness + 2;
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 - 3;
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 = 2; 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 - 2)
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(struct acpi_video_device *device,
union acpi_object **levels)
{
int status;
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *obj;
*levels = NULL;
status = acpi_evaluate_object(device->dev->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 = 2; state < device->brightness->count; state++)
if (level == device->brightness->levels[state]) {
if (device->backlight)
device->backlight->props.brightness = state - 2;
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 __init video_set_bqc_offset(const struct dmi_system_id *d)
{
bqc_offset_aml_bug_workaround = 9;
return 0;
}
static int __init video_disable_native_backlight(const struct dmi_system_id *d)
{
use_native_backlight_dmi = NATIVE_BACKLIGHT_OFF;
return 0;
}
static int __init video_enable_native_backlight(const struct dmi_system_id *d)
{
use_native_backlight_dmi = NATIVE_BACKLIGHT_ON;
return 0;
}
static int __init 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 struct dmi_system_id video_dmi_table[] __initdata = {
/*
* 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"),
},
},
/*
* These models have a working acpi_video backlight control, and using
* native backlight causes a regression where backlight does not work
* when userspace is not handling brightness key events. Disable
* native_backlight on these to fix this:
* https://bugzilla.kernel.org/show_bug.cgi?id=81691
*/
{
.callback = video_disable_native_backlight,
.ident = "ThinkPad T420",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T420"),
},
},
{
.callback = video_disable_native_backlight,
.ident = "ThinkPad T520",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T520"),
},
},
{
.callback = video_disable_native_backlight,
.ident = "ThinkPad X201s",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad X201s"),
},
},
/* The native backlight controls do not work on some older machines */
{
/* https://bugs.freedesktop.org/show_bug.cgi?id=81515 */
.callback = video_disable_native_backlight,
.ident = "HP ENVY 15 Notebook",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Hewlett-Packard"),
DMI_MATCH(DMI_PRODUCT_NAME, "HP ENVY 15 Notebook PC"),
},
},
{
.callback = video_disable_native_backlight,
.ident = "SAMSUNG 870Z5E/880Z5E/680Z5E",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
DMI_MATCH(DMI_PRODUCT_NAME, "870Z5E/880Z5E/680Z5E"),
},
},
{
.callback = video_disable_native_backlight,
.ident = "SAMSUNG 370R4E/370R4V/370R5E/3570RE/370R5V",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
DMI_MATCH(DMI_PRODUCT_NAME, "370R4E/370R4V/370R5E/3570RE/370R5V"),
},
},
{
/* https://bugzilla.redhat.com/show_bug.cgi?id=1186097 */
.callback = video_disable_native_backlight,
.ident = "SAMSUNG 3570R/370R/470R/450R/510R/4450RV",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
DMI_MATCH(DMI_PRODUCT_NAME, "3570R/370R/470R/450R/510R/4450RV"),
},
},
{
/* https://bugzilla.redhat.com/show_bug.cgi?id=1094948 */
.callback = video_disable_native_backlight,
.ident = "SAMSUNG 730U3E/740U3E",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
DMI_MATCH(DMI_PRODUCT_NAME, "730U3E/740U3E"),
},
},
{
/* https://bugs.freedesktop.org/show_bug.cgi?id=87286 */
.callback = video_disable_native_backlight,
.ident = "SAMSUNG 900X3C/900X3D/900X3E/900X4C/900X4D",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."),
DMI_MATCH(DMI_PRODUCT_NAME, "900X3C/900X3D/900X3E/900X4C/900X4D"),
},
},
{
/* https://bugzilla.redhat.com/show_bug.cgi?id=1163574 */
.callback = video_disable_native_backlight,
.ident = "Dell XPS15 L521X",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."),
DMI_MATCH(DMI_PRODUCT_NAME, "XPS L521X"),
},
},
/* Non win8 machines which need native backlight nevertheless */
{
/* https://bugzilla.redhat.com/show_bug.cgi?id=1187004 */
.callback = video_enable_native_backlight,
.ident = "Lenovo Ideapad Z570",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
DMI_MATCH(DMI_PRODUCT_NAME, "102434U"),
},
},
{
/* https://bugzilla.redhat.com/show_bug.cgi?id=1217249 */
.callback = video_enable_native_backlight,
.ident = "Apple MacBook Pro 12,1",
.matches = {
DMI_MATCH(DMI_SYS_VENDOR, "Apple Inc."),
DMI_MATCH(DMI_PRODUCT_NAME, "MacBookPro12,1"),
},
},
/*
* 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://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"),
},
},
{}
};
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, so we need
* to compensate for that by offsetting ourselves
*/
if (device->brightness->flags._BCL_reversed)
bqc_value = device->brightness->count - 3 - bqc_value;
level = device->brightness->levels[bqc_value + 2];
} 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 = 2; 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.
*/
test_level = current_level == max_level ? br->levels[3] : 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 - 3 - level;
if (br->levels[level + 2] == test_level)
br->flags._BQC_use_index = 1;
}
if (!br->flags._BQC_use_index)
device->cap._BQC = device->cap._BCQ = 0;
}
return 0;
}
/*
* 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)
{
union acpi_object *obj = NULL;
int i, max_level = 0, count = 0, level_ac_battery = 0;
unsigned long long level, level_old;
union acpi_object *o;
struct acpi_video_device_brightness *br = NULL;
int result = -EINVAL;
u32 value;
if (!ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available "
"LCD brightness level\n"));
goto out;
}
if (obj->package.count < 2)
goto out;
br = kzalloc(sizeof(*br), GFP_KERNEL);
if (!br) {
printk(KERN_ERR "can't allocate memory\n");
result = -ENOMEM;
goto out;
}
br->levels = kmalloc((obj->package.count + 2) * 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 > 2 && 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 = 2; i < count; i++) {
if (br->levels[i] == br->levels[0])
level_ac_battery++;
if (br->levels[i] == br->levels[1])
level_ac_battery++;
}
if (level_ac_battery < 2) {
level_ac_battery = 2 - level_ac_battery;
br->flags._BCL_no_ac_battery_levels = 1;
for (i = (count - 1 + level_ac_battery); i >= 2; i--)
br->levels[i] = br->levels[i - level_ac_battery];
count += level_ac_battery;
} else if (level_ac_battery > 2)
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[2]) {
br->flags._BCL_reversed = 1;
sort(&br->levels[2], count - 2, sizeof(br->levels[2]),
acpi_video_cmp_level, NULL);
} else if (max_level != br->levels[count - 1])
ACPI_ERROR((AE_INFO,
"Found unordered _BCL package"));
br->count = count;
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 = 2; 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", count - 2));
kfree(obj);
return result;
out_free_levels:
kfree(br->levels);
out_free:
kfree(br);
out:
device->brightness = NULL;
kfree(obj);
return result;
}
/*
* Arg:
* device : video output device (LCD, CRT, ..)
*