video.c

linux 内核源代码

/*
 *  video.c - ACPI Video Driver ($Revision:$)
 *
 *  Copyright (C) 2004 Luming Yu <[e-mail]>
 *  Copyright (C) 2004 Bruno Ducrot <[e-mail]>
 *  Copyright (C) 2006 Thomas Tuttle <[e-mail]>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  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/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/input.h>
#include <linux/backlight.h>
#include <linux/video_output.h>
#include <asm/uaccess.h>

#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>

#define ACPI_VIDEO_COMPONENT		0x08000000
#define ACPI_VIDEO_CLASS		"video"
#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 ACPI_VIDEO_HEAD_INVALID		(~0u - 1)
#define ACPI_VIDEO_HEAD_END		(~0u)
#define MAX_NAME_LEN	20

#define ACPI_VIDEO_DISPLAY_CRT	1
#define ACPI_VIDEO_DISPLAY_TV	2
#define ACPI_VIDEO_DISPLAY_DVI	3
#define ACPI_VIDEO_DISPLAY_LCD	4

#define _COMPONENT		ACPI_VIDEO_COMPONENT
ACPI_MODULE_NAME("video");

MODULE_AUTHOR("Bruno Ducrot");
MODULE_DESCRIPTION("ACPI Video Driver");
MODULE_LICENSE("GPL");

static int acpi_video_bus_add(struct acpi_device *device);
static int acpi_video_bus_remove(struct acpi_device *device, int type);

static const struct acpi_device_id video_device_ids[] = {
	{ACPI_VIDEO_HID, 0},
	{"", 0},
};
MODULE_DEVICE_TABLE(acpi, video_device_ids);

static struct acpi_driver acpi_video_bus = {
	.name = "video",
	.class = ACPI_VIDEO_CLASS,
	.ids = video_device_ids,
	.ops = {
		.add = acpi_video_bus_add,
		.remove = acpi_video_bus_remove,
		},
};

struct acpi_video_bus_flags {
	u8 multihead:1;		/* can switch video heads */
	u8 rom:1;		/* can retrieve a video rom */
	u8 post:1;		/* can configure the head to */
	u8 reserved:5;
};

struct acpi_video_bus_cap {
	u8 _DOS:1;		/*Enable/Disable output switching */
	u8 _DOD:1;		/*Enumerate all devices attached to display adapter */
	u8 _ROM:1;		/*Get ROM Data */
	u8 _GPD:1;		/*Get POST Device */
	u8 _SPD:1;		/*Set POST Device */
	u8 _VPO:1;		/*Video POST Options */
	u8 reserved:2;
};

struct acpi_video_device_attrib {
	u32 display_index:4;	/* A zero-based instance of the Display */
	u32 display_port_attachment:4;	/*This field differentiates the display type */
	u32 display_type:4;	/*Describe the specific type in use */
	u32 vendor_specific:4;	/*Chipset Vendor Specific */
	u32 bios_can_detect:1;	/*BIOS can detect the device */
	u32 depend_on_vga:1;	/*Non-VGA output device whose power is related to 
				   the VGA device. */
	u32 pipe_id:3;		/*For VGA multiple-head devices. */
	u32 reserved:10;	/*Must be 0 */
	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;
	u8 dos_setting;
	struct acpi_video_enumerated_device *attached_array;
	u8 attached_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 proc_dir_entry *dir;
	struct input_dev *input;
	char phys[32];	/* for input device */
};

struct acpi_video_device_flags {
	u8 crt:1;
	u8 lcd:1;
	u8 tvout:1;
	u8 dvi:1;
	u8 bios:1;
	u8 unknown:1;
	u8 reserved:2;
};

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 _DDC:1;		/*Return the EDID for this device */
	u8 _DCS:1;		/*Return status of output device */
	u8 _DGS:1;		/*Query graphics state */
	u8 _DSS:1;		/*Device state set */
};

struct acpi_video_device_brightness {
	int curr;
	int count;
	int *levels;
};

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 acpi_video_bus *video;
	struct acpi_device *dev;
	struct acpi_video_device_brightness *brightness;
	struct backlight_device *backlight;
	struct output_device *output_dev;
};

/* bus */
static int acpi_video_bus_info_open_fs(struct inode *inode, struct file *file);
static struct file_operations acpi_video_bus_info_fops = {
	.open = acpi_video_bus_info_open_fs,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
};

static int acpi_video_bus_ROM_open_fs(struct inode *inode, struct file *file);
static struct file_operations acpi_video_bus_ROM_fops = {
	.open = acpi_video_bus_ROM_open_fs,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
};

static int acpi_video_bus_POST_info_open_fs(struct inode *inode,
					    struct file *file);
static struct file_operations acpi_video_bus_POST_info_fops = {
	.open = acpi_video_bus_POST_info_open_fs,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
};

static int acpi_video_bus_POST_open_fs(struct inode *inode, struct file *file);
static struct file_operations acpi_video_bus_POST_fops = {
	.open = acpi_video_bus_POST_open_fs,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
};

static int acpi_video_bus_DOS_open_fs(struct inode *inode, struct file *file);
static struct file_operations acpi_video_bus_DOS_fops = {
	.open = acpi_video_bus_DOS_open_fs,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
};

/* device */
static int acpi_video_device_info_open_fs(struct inode *inode,
					  struct file *file);
static struct file_operations acpi_video_device_info_fops = {
	.open = acpi_video_device_info_open_fs,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
};

static int acpi_video_device_state_open_fs(struct inode *inode,
					   struct file *file);
static struct file_operations acpi_video_device_state_fops = {
	.open = acpi_video_device_state_open_fs,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
};

static int acpi_video_device_brightness_open_fs(struct inode *inode,
						struct file *file);
static struct file_operations acpi_video_device_brightness_fops = {
	.open = acpi_video_device_brightness_open_fs,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
};

static int acpi_video_device_EDID_open_fs(struct inode *inode,
					  struct file *file);
static struct file_operations acpi_video_device_EDID_fops = {
	.open = acpi_video_device_EDID_open_fs,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
};

static 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_switch_output(struct acpi_video_bus *video, int event);
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 *level);
static int acpi_video_get_next_level(struct acpi_video_device *device,
				     u32 level_current, u32 event);
static void acpi_video_switch_brightness(struct acpi_video_device *device,
					 int event);
static int acpi_video_device_get_state(struct acpi_video_device *device,
			    unsigned long *state);
static int acpi_video_output_get(struct output_device *od);
static int acpi_video_device_set_state(struct acpi_video_device *device, int state);

/*backlight device sysfs support*/
static int acpi_video_get_brightness(struct backlight_device *bd)
{
	unsigned long cur_level;
	struct acpi_video_device *vd =
		(struct acpi_video_device *)bl_get_data(bd);
	acpi_video_device_lcd_get_level_current(vd, &cur_level);
	return (int) cur_level;
}

static int acpi_video_set_brightness(struct backlight_device *bd)
{
	int request_level = bd->props.brightness;
	struct acpi_video_device *vd =
		(struct acpi_video_device *)bl_get_data(bd);
	acpi_video_device_lcd_set_level(vd, request_level);
	return 0;
}

static struct backlight_ops acpi_backlight_ops = {
	.get_brightness = acpi_video_get_brightness,
	.update_status  = acpi_video_set_brightness,
};

/*video output device sysfs support*/
static int acpi_video_output_get(struct output_device *od)
{
	unsigned long state;
	struct acpi_video_device *vd =
		(struct acpi_video_device *)dev_get_drvdata(&od->dev);
	acpi_video_device_get_state(vd, &state);
	return (int)state;
}

static int acpi_video_output_set(struct output_device *od)
{
	unsigned long state = od->request_state;
	struct acpi_video_device *vd=
		(struct acpi_video_device *)dev_get_drvdata(&od->dev);
	return acpi_video_device_set_state(vd, state);
}

static struct output_properties acpi_output_properties = {
	.set_state = acpi_video_output_set,
	.get_status = acpi_video_output_get,
};
/* --------------------------------------------------------------------------
                               Video Management
   -------------------------------------------------------------------------- */

/* device */

static int
acpi_video_device_query(struct acpi_video_device *device, unsigned long *state)
{
	int status;

	status = acpi_evaluate_integer(device->dev->handle, "_DGS", NULL, state);

	return status;
}

static int
acpi_video_device_get_state(struct acpi_video_device *device,
			    unsigned long *state)
{
	int status;

	status = acpi_evaluate_integer(device->dev->handle, "_DCS", NULL, state);

	return status;
}

static int
acpi_video_device_set_state(struct acpi_video_device *device, int state)
{
	int status;
	union acpi_object arg0 = { ACPI_TYPE_INTEGER };
	struct acpi_object_list args = { 1, &arg0 };
	unsigned long ret;


	arg0.integer.value = state;
	status = acpi_evaluate_integer(device->dev->handle, "_DSS", &args, &ret);

	return status;
}

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 = AE_OK;
	union acpi_object arg0 = { ACPI_TYPE_INTEGER };
	struct acpi_object_list args = { 1, &arg0 };


	arg0.integer.value = level;

	if (device->cap._BCM)
		status = acpi_evaluate_object(device->dev->handle, "_BCM",
					      &args, NULL);
	device->brightness->curr = level;
	return status;
}

static int
acpi_video_device_lcd_get_level_current(struct acpi_video_device *device,
					unsigned long *level)
{
	if (device->cap._BQC)
		return acpi_evaluate_integer(device->dev->handle, "_BQC", NULL,
					     level);
	*level = device->brightness->curr;
	return AE_OK;
}

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 */

static int
acpi_video_bus_set_POST(struct acpi_video_bus *video, unsigned long option)
{
	int status;
	unsigned long tmp;
	union acpi_object arg0 = { ACPI_TYPE_INTEGER };
	struct acpi_object_list args = { 1, &arg0 };


	arg0.integer.value = option;

	status = acpi_evaluate_integer(video->device->handle, "_SPD", &args, &tmp);
	if (ACPI_SUCCESS(status))
		status = tmp ? (-EINVAL) : (AE_OK);

	return status;
}

static int
acpi_video_bus_get_POST(struct acpi_video_bus *video, unsigned long *id)
{
	int status;

	status = acpi_evaluate_integer(video->device->handle, "_GPD", NULL, id);

	return status;
}

static int
acpi_video_bus_POST_options(struct acpi_video_bus *video,
			    unsigned long *options)
{
	int status;

	status = acpi_evaluate_integer(video->device->handle, "_VPO", NULL, options);
	*options &= 3;