video.c

linux 内核源代码

	return status;
}

/*
 *  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:
 * 		-1	wrong arg.
 */

static int
acpi_video_bus_DOS(struct acpi_video_bus *video, int bios_flag, int lcd_flag)
{
	acpi_integer status = 0;
	union acpi_object arg0 = { ACPI_TYPE_INTEGER };
	struct acpi_object_list args = { 1, &arg0 };


	if (bios_flag < 0 || bios_flag > 3 || lcd_flag < 0 || lcd_flag > 1) {
		status = -1;
		goto Failed;
	}
	arg0.integer.value = (lcd_flag << 2) | bios_flag;
	video->dos_setting = arg0.integer.value;
	acpi_evaluate_object(video->device->handle, "_DOS", &args, NULL);

      Failed:
	return status;
}

/*
 *  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)
{
	acpi_handle h_dummy1;
	int i;
	u32 max_level = 0;
	union acpi_object *obj = NULL;
	struct acpi_video_device_brightness *br = NULL;


	memset(&device->cap, 0, sizeof(device->cap));

	if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_ADR", &h_dummy1))) {
		device->cap._ADR = 1;
	}
	if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCL", &h_dummy1))) {
		device->cap._BCL = 1;
	}
	if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_BCM", &h_dummy1))) {
		device->cap._BCM = 1;
	}
	if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle,"_BQC",&h_dummy1)))
		device->cap._BQC = 1;
	if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DDC", &h_dummy1))) {
		device->cap._DDC = 1;
	}
	if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DCS", &h_dummy1))) {
		device->cap._DCS = 1;
	}
	if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DGS", &h_dummy1))) {
		device->cap._DGS = 1;
	}
	if (ACPI_SUCCESS(acpi_get_handle(device->dev->handle, "_DSS", &h_dummy1))) {
		device->cap._DSS = 1;
	}

	if (ACPI_SUCCESS(acpi_video_device_lcd_query_levels(device, &obj))) {

		if (obj->package.count >= 2) {
			int count = 0;
			union acpi_object *o;

			br = kzalloc(sizeof(*br), GFP_KERNEL);
			if (!br) {
				printk(KERN_ERR "can't allocate memory\n");
			} else {
				br->levels = kmalloc(obj->package.count *
						     sizeof *(br->levels), GFP_KERNEL);
				if (!br->levels)
					goto out;

				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;
					}
					br->levels[count] = (u32) o->integer.value;

					if (br->levels[count] > max_level)
						max_level = br->levels[count];
					count++;
				}
			      out:
				if (count < 2) {
					kfree(br->levels);
					kfree(br);
				} else {
					br->count = count;
					device->brightness = br;
					ACPI_DEBUG_PRINT((ACPI_DB_INFO,
							  "found %d brightness levels\n",
							  count));
				}
			}
		}

	} else {
		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Could not query available LCD brightness level\n"));
	}

	kfree(obj);

	if (device->cap._BCL && device->cap._BCM && device->cap._BQC && max_level > 0){
		unsigned long tmp;
		static int count = 0;
		char *name;
		name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
		if (!name)
			return;

		sprintf(name, "acpi_video%d", count++);
		acpi_video_device_lcd_get_level_current(device, &tmp);
		device->backlight = backlight_device_register(name,
			NULL, device, &acpi_backlight_ops);
		device->backlight->props.max_brightness = max_level;
		device->backlight->props.brightness = (int)tmp;
		backlight_update_status(device->backlight);

		kfree(name);
	}
	if (device->cap._DCS && device->cap._DSS){
		static int count = 0;
		char *name;
		name = kzalloc(MAX_NAME_LEN, GFP_KERNEL);
		if (!name)
			return;
		sprintf(name, "acpi_video%d", count++);
		device->output_dev = video_output_register(name,
				NULL, device, &acpi_output_properties);
		kfree(name);
	}
	return;
}

/*
 *  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)
{
	acpi_handle h_dummy1;

	memset(&video->cap, 0, sizeof(video->cap));
	if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOS", &h_dummy1))) {
		video->cap._DOS = 1;
	}
	if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_DOD", &h_dummy1))) {
		video->cap._DOD = 1;
	}
	if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_ROM", &h_dummy1))) {
		video->cap._ROM = 1;
	}
	if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_GPD", &h_dummy1))) {
		video->cap._GPD = 1;
	}
	if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_SPD", &h_dummy1))) {
		video->cap._SPD = 1;
	}
	if (ACPI_SUCCESS(acpi_get_handle(video->device->handle, "_VPO", &h_dummy1))) {
		video->cap._VPO = 1;
	}
}

/*
 * Check whether the video bus device has required AML method to
 * support the desired features
 */

static int acpi_video_bus_check(struct acpi_video_bus *video)
{
	acpi_status status = -ENOENT;


	if (!video)
		return -EINVAL;

	/* 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->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;
}

/* --------------------------------------------------------------------------
                              FS Interface (/proc)
   -------------------------------------------------------------------------- */

static struct proc_dir_entry *acpi_video_dir;

/* video devices */

static int acpi_video_device_info_seq_show(struct seq_file *seq, void *offset)
{
	struct acpi_video_device *dev = seq->private;


	if (!dev)
		goto end;

	seq_printf(seq, "device_id:    0x%04x\n", (u32) dev->device_id);
	seq_printf(seq, "type:         ");
	if (dev->flags.crt)
		seq_printf(seq, "CRT\n");
	else if (dev->flags.lcd)
		seq_printf(seq, "LCD\n");
	else if (dev->flags.tvout)
		seq_printf(seq, "TVOUT\n");
	else if (dev->flags.dvi)
		seq_printf(seq, "DVI\n");
	else
		seq_printf(seq, "UNKNOWN\n");

	seq_printf(seq, "known by bios: %s\n", dev->flags.bios ? "yes" : "no");

      end:
	return 0;
}

static int
acpi_video_device_info_open_fs(struct inode *inode, struct file *file)
{
	return single_open(file, acpi_video_device_info_seq_show,
			   PDE(inode)->data);
}

static int acpi_video_device_state_seq_show(struct seq_file *seq, void *offset)
{
	int status;
	struct acpi_video_device *dev = seq->private;
	unsigned long state;


	if (!dev)
		goto end;

	status = acpi_video_device_get_state(dev, &state);
	seq_printf(seq, "state:     ");
	if (ACPI_SUCCESS(status))
		seq_printf(seq, "0x%02lx\n", state);
	else
		seq_printf(seq, "<not supported>\n");

	status = acpi_video_device_query(dev, &state);
	seq_printf(seq, "query:     ");
	if (ACPI_SUCCESS(status))
		seq_printf(seq, "0x%02lx\n", state);
	else
		seq_printf(seq, "<not supported>\n");

      end:
	return 0;
}

static int
acpi_video_device_state_open_fs(struct inode *inode, struct file *file)
{
	return single_open(file, acpi_video_device_state_seq_show,
			   PDE(inode)->data);
}

static ssize_t
acpi_video_device_write_state(struct file *file,
			      const char __user * buffer,
			      size_t count, loff_t * data)
{
	int status;
	struct seq_file *m = file->private_data;
	struct acpi_video_device *dev = m->private;
	char str[12] = { 0 };
	u32 state = 0;


	if (!dev || count + 1 > sizeof str)
		return -EINVAL;

	if (copy_from_user(str, buffer, count))
		return -EFAULT;

	str[count] = 0;
	state = simple_strtoul(str, NULL, 0);
	state &= ((1ul << 31) | (1ul << 30) | (1ul << 0));

	status = acpi_video_device_set_state(dev, state);

	if (status)
		return -EFAULT;

	return count;
}

static int
acpi_video_device_brightness_seq_show(struct seq_file *seq, void *offset)
{
	struct acpi_video_device *dev = seq->private;
	int i;


	if (!dev || !dev->brightness) {
		seq_printf(seq, "<not supported>\n");
		return 0;
	}

	seq_printf(seq, "levels: ");
	for (i = 0; i < dev->brightness->count; i++)
		seq_printf(seq, " %d", dev->brightness->levels[i]);
	seq_printf(seq, "\ncurrent: %d\n", dev->brightness->curr);

	return 0;
}

static int
acpi_video_device_brightness_open_fs(struct inode *inode, struct file *file)
{
	return single_open(file, acpi_video_device_brightness_seq_show,
			   PDE(inode)->data);
}

static ssize_t
acpi_video_device_write_brightness(struct file *file,
				   const char __user * buffer,
				   size_t count, loff_t * data)
{
	struct seq_file *m = file->private_data;
	struct acpi_video_device *dev = m->private;
	char str[5] = { 0 };
	unsigned int level = 0;
	int i;


	if (!dev || !dev->brightness || count + 1 > sizeof str)
		return -EINVAL;

	if (copy_from_user(str, buffer, count))
		return -EFAULT;

	str[count] = 0;
	level = simple_strtoul(str, NULL, 0);

	if (level > 100)
		return -EFAULT;

	/* validate through the list of available levels */
	for (i = 0; i < dev->brightness->count; i++)
		if (level == dev->brightness->levels[i]) {
			if (ACPI_SUCCESS
			    (acpi_video_device_lcd_set_level(dev, level)))
				dev->brightness->curr = level;
			break;
		}

	return count;
}

static int acpi_video_device_EDID_seq_show(struct seq_file *seq, void *offset)
{
	struct acpi_video_device *dev = seq->private;
	int status;
	int i;
	union acpi_object *edid = NULL;


	if (!dev)
		goto out;

	status = acpi_video_device_EDID(dev, &edid, 128);
	if (ACPI_FAILURE(status)) {
		status = acpi_video_device_EDID(dev, &edid, 256);
	}

	if (ACPI_FAILURE(status)) {
		goto out;
	}

	if (edid && edid->type == ACPI_TYPE_BUFFER) {
		for (i = 0; i < edid->buffer.length; i++)
			seq_putc(seq, edid->buffer.pointer[i]);
	}

      out:
	if (!edid)
		seq_printf(seq, "<not supported>\n");
	else
		kfree(edid);

	return 0;
}

static int
acpi_video_device_EDID_open_fs(struct inode *inode, struct file *file)
{
	return single_open(file, acpi_video_device_EDID_seq_show,
			   PDE(inode)->data);
}

static int acpi_video_device_add_fs(struct acpi_device *device)
{
	struct proc_dir_entry *entry = NULL;
	struct acpi_video_device *vid_dev;


	if (!device)
		return -ENODEV;

	vid_dev = acpi_driver_data(device);
	if (!vid_dev)
		return -ENODEV;

	if (!acpi_device_dir(device)) {
		acpi_device_dir(device) = proc_mkdir(acpi_device_bid(device),
						     vid_dev->video->dir);
		if (!acpi_device_dir(device))
			return -ENODEV;
		acpi_device_dir(device)->owner = THIS_MODULE;
	}

	/* 'info' [R] */
	entry = create_proc_entry("info", S_IRUGO, acpi_device_dir(device));
	if (!entry)
		return -ENODEV;
	else {
		entry->proc_fops = &acpi_video_device_info_fops;
		entry->data = acpi_driver_data(device);
		entry->owner = THIS_MODULE;
	}

	/* 'state' [R/W] */
	entry =
	    create_proc_entry("state", S_IFREG | S_IRUGO | S_IWUSR,
			      acpi_device_dir(device));
	if (!entry)
		return -ENODEV;
	else {
		acpi_video_device_state_fops.write = acpi_video_device_write_state;
		entry->proc_fops = &acpi_video_device_state_fops;
		entry->data = acpi_driver_data(device);
		entry->owner = THIS_MODULE;
	}

	/* 'brightness' [R/W] */
	entry =
	    create_proc_entry("brightness", S_IFREG | S_IRUGO | S_IWUSR,
			      acpi_device_dir(device));
	if (!entry)
		return -ENODEV;
	else {
		acpi_video_device_brightness_fops.write = acpi_video_device_write_brightness;
		entry->proc_fops = &acpi_video_device_brightness_fops;
		entry->data = acpi_driver_data(device);
		entry->owner = THIS_MODULE;
	}

	/* 'EDID' [R] */
	entry = create_proc_entry("EDID", S_IRUGO, acpi_device_dir(device));
	if (!entry)
		return -ENODEV;