cregit-Linux how code gets into the kernel

Release 4.14 drivers/acpi/acpi_video.c

Directory: drivers/acpi
/*
 *  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 = 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);


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 bool only_lcd = false;
module_param(only_lcd, bool, 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;
}


Contributors
PersonTokensPropCommitsCommitProp
Rui Zhang7588.24%125.00%


Len Brown78.24%125.00%


Dmitry Frank22.35%125.00%


Danny Baumann11.18%125.00%


Total85100.00%4100.00%






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]);
}


Contributors
PersonTokensPropCommitsCommitProp
Rui Zhang4174.55%125.00%


Linus Torvalds814.55%125.00%


Jan Engelhardt59.09%125.00%


Dmitry Frank11.82%125.00%


Total55100.00%4100.00%




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;
}


Contributors
PersonTokensPropCommitsCommitProp
Rui Zhang3772.55%133.33%


Len Brown1121.57%133.33%


Dmitry Frank35.88%133.33%


Total51100.00%3100.00%






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;
}


Contributors
PersonTokensPropCommitsCommitProp
Rui Zhang5650.45%222.22%


Matthew Garrett2724.32%222.22%


Yu Luming1917.12%111.11%


Len Brown65.41%111.11%


Matthew Wilcox10.90%111.11%


Dmitry Frank10.90%111.11%


Danny Baumann10.90%111.11%


Total111100.00%9100.00%





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);
}


Contributors
PersonTokensPropCommitsCommitProp
Rui Zhang6273.81%125.00%


Yu Luming1821.43%125.00%


Matthew Garrett33.57%125.00%


Dmitry Frank11.19%125.00%


Total84100.00%4100.00%




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;
}


Contributors
PersonTokensPropCommitsCommitProp
Rui Zhang11795.12%250.00%


Matthew Garrett43.25%125.00%


Aaron Lu21.63%125.00%


Total123100.00%4100.00%





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;
}


Contributors
PersonTokensPropCommitsCommitProp
Rui Zhang12293.13%350.00%


Matthew Garrett53.82%116.67%


Dmitry Frank21.53%116.67%


Jiang Liu21.53%116.67%


Total131100.00%6100.00%



/*
 * 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;
}


Contributors
PersonTokensPropCommitsCommitProp
Rui Zhang19100.00%2100.00%


Total19100.00%2100.00%






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;
}


Contributors
PersonTokensPropCommitsCommitProp
Hans de Goede26100.00%1100.00%


Total26100.00%1100.00%






static int video_set_device_id_scheme(const struct dmi_system_id *d)
{
	device_id_scheme = true;
	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Aaron Lu19100.00%1100.00%


Total19100.00%1100.00%






static int video_enable_only_lcd(const struct dmi_system_id *d)
{
	only_lcd = true;
	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Aaron Lu19100.00%1100.00%


Total19100.00%1100.00%






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;
}


Contributors
PersonTokensPropCommitsCommitProp
Hans de Goede31100.00%1100.00%


Total31100.00%1100.00%




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;
}


Contributors
PersonTokensPropCommitsCommitProp
Danny Baumann8193.10%133.33%


Dmitry Frank55.75%133.33%


Len Brown11.15%133.33%


Total87100.00%3100.00%





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;
}


Contributors
PersonTokensPropCommitsCommitProp
Rui Zhang15270.05%112.50%


Len Brown4319.82%112.50%


Danny Baumann167.37%225.00%


Patrick Mochel41.84%225.00%


Felipe Contreras10.46%112.50%


Dmitry Frank10.46%112.50%


Total217100.00%8100.00%





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;
}


Contributors
PersonTokensPropCommitsCommitProp
Rui Zhang11966.85%342.86%


Len Brown5430.34%114.29%


Patrick Mochel31.69%228.57%


Alexey Y. Starikovskiy21.12%114.29%


Total178100.00%7100.00%



/* 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;
}


Contributors
PersonTokensPropCommitsCommitProp
Rui Zhang7170.30%457.14%


Igor Murzov1817.82%114.29%


Jiang Liu1110.89%114.29%


Len Brown10.99%114.29%


Total101100.00%7100.00%



/*
 * 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;
}


Contributors
PersonTokensPropCommitsCommitProp
Rui Zhang31100.00%3100.00%


Total31100.00%3100.00%



/*
 * 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;
}


Contributors
PersonTokensPropCommitsCommitProp
Aaron Lu17695.65%133.33%


Dmitry Frank84.35%266.67%


Total184100.00%3100.00%






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((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;
}

Contributors
PersonTokensPropCommitsCommitProp
Rui Zhang37567.32%533.33%


Aaron Lu6211.13%213.33%


Len Brown356.28%16.67%


Hans de Goede315.57%16.67%


Vladimir Serbinenko295.21%16.67%


Dmitry Frank183.23%213.33%


Matthew Garrett40.72%16.67%


Colin Ian King20.36%16.67%


Patrick Mochel10.18%16.67%


Total557100.00%15100.00%




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;
}


Contributors
PersonTokensPropCommitsCommitProp
Rui Zhang11546.37%17.69%


Aaron Lu7831.45%646.15%


Len Brown3614.52%17.69%


Danny Baumann156.05%323.08%


Dmitry Frank20.81%17.69%


Patrick Mochel20.81%17.69%


Total248100.00%13100.00%



/*
 *  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;
}


Contributors
PersonTokensPropCommitsCommitProp
Rui Zhang12987.16%233.33%


Len Brown96.08%116.67%


Jiang Liu85.41%116.67%


Arjan van de Ven10.68%116.67%


Aaron Lu10.68%116.67%


Total148100.00%6100.00%



/*
 *  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;
}


Contributors
PersonTokensPropCommitsCommitProp
Aaron Lu7856.93%116.67%


Rui Zhang2719.71%116.67%


Len Brown1813.14%116.67%


Matthew Garrett128.76%233.33%


Rafael J. Wysocki21.46%116.67%


Total137100.00%6100.00%



/*
 * 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;
}


Contributors
PersonTokensPropCommitsCommitProp
Rui Zhang16599.40%266.67%


Felipe Contreras10.60%133.33%


Total166100.00%3100.00%



/*
 * --------------------------------------------------------------------------
 *                               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;
}


Contributors
PersonTokensPropCommitsCommitProp
Rui Zhang5470.13%133.33%


Dmitry Torokhov2228.57%133.33%


Len Brown11.30%133.33%


Total77100.00%3100.00%





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;
}


Contributors
PersonTokensPropCommitsCommitProp
Matthew Garrett7297.30%133.33%


Len Brown11.35%133.33%


Rui Zhang11.35%133.33%


Total74100.00%3100.00%





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;
}


Contributors
PersonTokensPropCommitsCommitProp
Len Brown19053.82%18.33%


Rui Zhang6718.98%18.33%


Matthew Garrett6217.56%18.33%


Aaron Lu133.68%325.00%


Linus Torvalds102.83%18.33%


Patrick Mochel41.13%18.33%


Dmitry Torokhov30.85%18.33%


Pavel Machek20.57%18.33%


Matthew Wilcox10.28%18.33%


Burman Yan10.28%18.33%


Total353100.00%12100.00%



/*
 *  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);
}


Contributors
PersonTokensPropCommitsCommitProp
Len Brown2757.45%133.33%


Dmitry Torokhov2042.55%266.67%


Total47100.00%3100.00%



/*
 *  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));
		}
	}
}


Contributors
PersonTokensPropCommitsCommitProp
Len Brown6373.26%150.00%


Dmitry Torokhov2326.74%150.00%


Total86100.00%2100.00%






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;
}


Contributors
PersonTokensPropCommitsCommitProp
Aaron Lu88100.00%3100.00%


Total88100.00%3100.00%



/*
 *  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;
}


Contributors
PersonTokensPropCommitsCommitProp
Len Brown28086.42%333.33%


Dmitry Torokhov144.32%111.11%


Alex Hung123.70%111.11%


Thomas Renninger103.09%111.11%


Patrick Mochel61.85%222.22%


Linus Torvalds20.62%111.11%


Total324100.00%9100.00%





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;
	}
}


Contributors
PersonTokensPropCommitsCommitProp
Thomas Tuttle16064.26%125.00%


Alexey Y. Starikovskiy6726.91%125.00%


Len Brown208.03%125.00%


Dmitry Frank20.80%125.00%


Total249100.00%4100.00%





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");
}


Contributors
PersonTokensPropCommitsCommitProp
Len Brown4030.08%18.33%


Rui Zhang3627.07%325.00%


Linus Torvalds2921.80%18.33%


Matthew Garrett1511.28%216.67%


Julia Jomantaite75.26%18.33%


Hans de Goede32.26%18.33%


Danny Baumann10.75%18.33%


Aaron Lu10.75%18.33%


Matthew Wilcox10.75%18.33%


Total133100.00%12100.00%






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;
}

Contributors
PersonTokensPropCommitsCommitProp
Matthew Garrett26796.39%150.00%


Rui Zhang103.61%150.00%


Total277100.00%2100.00%




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;
}


Contributors
PersonTokensPropCommitsCommitProp
Len Brown5167.11%114.29%


Aaron Lu1317.11%228.57%


Dmitry Torokhov67.89%114.29%


Igor Murzov33.95%114.29%


Patrick Mochel22.63%114.29%


Lucas De Marchi11.32%114.29%


Total76100.00%7100.00%



/* 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);
}


Contributors
PersonTokensPropCommitsCommitProp
Aaron Lu1453.85%233.33%


Len Brown726.92%116.67%


Karol Kozimor311.54%116.67%


Andi Kleen13.85%116.67%


Patrick Mochel13.85%116.67%


Total26100.00%6100.00%






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);
}


Contributors
PersonTokensPropCommitsCommitProp
Aaron Lu2388.46%375.00%


Andi Kleen311.54%125.00%


Total26100.00%4100.00%






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;
}


Contributors
PersonTokensPropCommitsCommitProp
Aaron Lu12870.33%112.50%


Len Brown179.34%112.50%


Rui Zhang126.59%112.50%


Yu Luming94.95%225.00%


Hans de Goede63.30%112.50%


Keith Packard52.75%112.50%


Dmitry Torokhov52.75%112.50%


Total182100.00%8100.00%






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);
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds38100.00%1100.00%


Total38100.00%1100.00%






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;
}


Contributors
PersonTokensPropCommitsCommitProp
Yu Luming6831.19%19.09%


Len Brown6027.52%19.09%


Aaron Lu5726.15%19.09%


Rui Zhang94.13%19.09%


Patrick Mochel62.75%218.18%


Hans de Goede62.75%19.09%


Linus Torvalds52.29%19.09%


Björn Helgaas41.83%19.09%


Matthew Garrett20.92%19.09%


Justin P. Mattock10.46%19.09%


Total218100.00%11100.00%






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;
}


Contributors
PersonTokensPropCommitsCommitProp
Aaron Lu11794.35%150.00%


Hans de Goede75.65%150.00%


Total124100.00%2100.00%





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;
}


Contributors
PersonTokensPropCommitsCommitProp
Aaron Lu83100.00%1100.00%


Total83100.00%1100.00%






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");
}


Contributors
PersonTokensPropCommitsCommitProp
Aaron Lu31293.98%125.00%


Hans de Goede175.12%250.00%


Dmitry Frank30.90%125.00%


Total332100.00%4100.00%






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);
}


Contributors
PersonTokensPropCommitsCommitProp
Aaron Lu67100.00%2100.00%


Total67100.00%2100.00%






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;
}


Contributors
PersonTokensPropCommitsCommitProp
Aaron Lu51100.00%1100.00%


Total51100.00%1100.00%






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);
}


Contributors
PersonTokensPropCommitsCommitProp
Aaron Lu8477.06%350.00%


Hans de Goede2522.94%350.00%


Total109100.00%6100.00%






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;
	}
}


Contributors
PersonTokensPropCommitsCommitProp
Aaron Lu111100.00%1100.00%


Total111100.00%1100.00%






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;
}


Contributors
PersonTokensPropCommitsCommitProp
Aaron Lu5774.03%150.00%


Hans de Goede2025.97%150.00%


Total77100.00%2100.00%






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;
}


Contributors
PersonTokensPropCommitsCommitProp
Aaron Lu64100.00%1100.00%


Total64100.00%1100.00%






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;
}


Contributors
PersonTokensPropCommitsCommitProp
Aaron Lu27294.44%133.33%


Yu Luming155.21%133.33%


Len Brown10.35%133.33%


Total288100.00%3100.00%






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;
	}
}


Contributors
PersonTokensPropCommitsCommitProp
Aaron Lu3685.71%133.33%


Matthew Garrett511.90%133.33%


Rafael J. Wysocki12.38%133.33%


Total42100.00%3100.00%






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;
}


Contributors
PersonTokensPropCommitsCommitProp
Aaron Lu3657.14%133.33%


Matthew Garrett2031.75%133.33%


Rafael J. Wysocki711.11%133.33%


Total63100.00%3100.00%






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;
}


Contributors
PersonTokensPropCommitsCommitProp
Aaron Lu4469.84%150.00%


Rui Zhang1930.16%150.00%


Total63100.00%2100.00%




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;
}


Contributors
PersonTokensPropCommitsCommitProp
Aaron Lu9628.15%16.67%


Rui Zhang8926.10%213.33%


Yu Luming5315.54%16.67%


Len Brown4112.02%16.67%


Dmitry Torokhov4011.73%213.33%


Igor Murzov61.76%213.33%


Dan Carpenter41.17%16.67%


Patrick Mochel41.17%16.67%


Rafael J. Wysocki41.17%16.67%


Pavel Machek20.59%16.67%


Yakui Zhao10.29%16.67%


Burman Yan10.29%16.67%


Total341100.00%15100.00%






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;
}


Contributors
PersonTokensPropCommitsCommitProp
Len Brown6066.67%120.00%


Aaron Lu1718.89%120.00%


Yu Luming55.56%120.00%


Patrick Mochel44.44%120.00%


Rafael J. Wysocki44.44%120.00%


Total90100.00%5100.00%






static int __init is_i740(struct pci_dev *dev)
{
	if (dev->device == 0x00D1)
		return 1;
	if (dev->device == 0x7000)
		return 1;
	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Alan Cox37100.00%1100.00%


Total37100.00%1100.00%






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;
}


Contributors
PersonTokensPropCommitsCommitProp
Matthew Garrett6375.00%125.00%


Alan Cox1821.43%250.00%


Len Brown33.57%125.00%


Total84100.00%4100.00%






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;
	}

	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;
}

Contributors
PersonTokensPropCommitsCommitProp
Hans de Goede3250.00%333.33%


Len Brown1625.00%111.11%


Yakui Zhao710.94%111.11%


Chris Wilson34.69%111.11%


Rafael J. Wysocki34.69%111.11%


Patrick Mochel23.12%111.11%


Matthew Garrett11.56%111.11%


Total64100.00%9100.00%




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);
}

Contributors
PersonTokensPropCommitsCommitProp
Yakui Zhao1851.43%133.33%


Hans de Goede1748.57%266.67%


Total35100.00%3100.00%




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);
}


Contributors
PersonTokensPropCommitsCommitProp
Hans de Goede55100.00%3100.00%


Total55100.00%3100.00%






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);
}

Contributors
PersonTokensPropCommitsCommitProp
Hans de Goede40100.00%2100.00%


Total40100.00%2100.00%




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();
}


Contributors
PersonTokensPropCommitsCommitProp
Matthew Garrett2172.41%150.00%


Chris Wilson827.59%150.00%


Total29100.00%2100.00%






static void __exit acpi_video_exit(void)
{
	acpi_video_detect_exit();
	acpi_video_unregister();

	return;
}


Contributors
PersonTokensPropCommitsCommitProp
Len Brown850.00%125.00%


Yakui Zhao425.00%125.00%


Hans de Goede318.75%125.00%


Patrick Mochel16.25%125.00%


Total16100.00%4100.00%




module_init(acpi_video_init);

module_exit(acpi_video_exit);

Overall Contributors
PersonTokensPropCommitsCommitProp
Aaron Lu243828.21%1510.79%


Rui Zhang217425.16%2115.11%


Len Brown153517.76%96.47%


Matthew Garrett6046.99%107.19%


Hans de Goede5796.70%1913.67%


Yu Luming2202.55%32.16%


Thomas Tuttle1601.85%10.72%


Dmitry Torokhov1421.64%64.32%


Danny Baumann1171.35%32.16%


Linus Torvalds1031.19%32.16%


Alexey Y. Starikovskiy690.80%21.44%


Dmitry Frank660.76%21.44%


Alan Cox550.64%21.44%


Patrick Mochel440.51%32.16%


Thomas Renninger390.45%21.44%


Yakui Zhao360.42%21.44%


Rafael J. Wysocki340.39%42.88%


Vladimir Serbinenko290.34%10.72%


Igor Murzov270.31%32.16%


Felipe Contreras270.31%10.72%


Jiang Liu210.24%21.44%


Jan Engelhardt200.23%10.72%


Björn Helgaas190.22%10.72%


Alex Hung120.14%10.72%


Chris Wilson110.13%21.44%


Richard Purdie110.13%10.72%


Julia Jomantaite70.08%10.72%


Keith Packard50.06%10.72%


Pavel Machek40.05%10.72%


Andi Kleen40.05%10.72%


Dan Carpenter40.05%10.72%


Matthew Wilcox30.03%10.72%


Karol Kozimor30.03%10.72%


Tejun Heo30.03%10.72%


Lv Zheng30.03%10.72%


Burman Yan20.02%10.72%


Colin Ian King20.02%10.72%


Rusty Russell20.02%10.72%


Jarkko Nikula10.01%10.72%


Justin P. Mattock10.01%10.72%


Lucas De Marchi10.01%10.72%


Christoph Hellwig10.01%10.72%


Arjan van de Ven10.01%10.72%


Vasiliy Kulikov10.01%10.72%


Lionel Debroux10.01%10.72%


Total8641100.00%139100.00%


Directory: drivers/acpi



Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.