Date:	Wed, 6 Dec 2006 15:10:44 +0000 (GMT)
From:	James Simmons <jsimmons@...radead.org>
To:	Randy Dunlap <randy.dunlap@...cle.com>
cc:	Miguel Ojeda <maxextreme@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Fbdev development list 
	<linux-fbdev-devel@...ts.sourceforge.net>,
	Luming Yu <Luming.yu@...el.com>,
	Andrew Zabolotny <zap@...elink.ru>, linux-acpi@...r.kernel.org,
	kernel-discuss@...dhelds.org
Subject: Re: Display class


> > of Mr. Yu for acpi. Also this class could in time replace the lcd class 
> > located in the backlight directory since a lcd is a type of display.
> > The final hope is that the purpose auxdisplay could fall under this 
> > catergory.
> > 
> > P.S
> >    I know the edid parsing would have to be pulled out of the fbdev layer.

That patch was rought draft for feedback. I applied your comments. This 
patch actually works. It includes my backlight fix as well.

diff -urN -X fbdev-2.6/Documentation/dontdiff linus-2.6/drivers/acpi/video.c fbdev-2.6/drivers/acpi/video.c
--- linus-2.6/drivers/acpi/video.c	2006-11-07 05:38:34.000000000 -0500
+++ fbdev-2.6/drivers/acpi/video.c	2006-12-06 05:01:22.000000000 -0500
@@ -30,6 +30,7 @@
 #include <linux/list.h>
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
+#include <linux/display.h> 
 
 #include <asm/uaccess.h>
 
@@ -154,6 +155,19 @@
 	int *levels;
 };
 
+ 
+#if defined(CONFIG_DISPLAY_DDC) || defined(CONFIG_DISPLAY_DDC_MODULE)
+static int acpi_display_get_power(struct display_device *dev)
+{
+	return 0;
+}
+
+static int acpi_display_set_power(struct display_device *dev)
+{
+	return 0;
+}
+#endif
+
 struct acpi_video_device {
 	unsigned long device_id;
 	struct acpi_video_device_flags flags;
@@ -162,6 +176,10 @@
 	struct acpi_video_bus *video;
 	struct acpi_device *dev;
 	struct acpi_video_device_brightness *brightness;
+#if defined(CONFIG_DISPLAY_DDC) || defined(CONFIG_DISPLAY_DDC_MODULE)
+	struct display_driver acpi_display_driver;
+	struct display_device *display;
+#endif
 };
 
 /* bus */
@@ -399,6 +417,24 @@
 	return status;
 }
 
+#if defined(CONFIG_DISPLAY_DDC) || defined(CONFIG_DISPLAY_DDC_MODULE)
+static void *acpi_display_get_EDID(struct acpi_video_device *dev)
+{
+	union acpi_object *edid = NULL;
+	void *data = NULL;
+	int status;
+
+	status = acpi_video_device_EDID(dev, &edid, 128);
+	if (ACPI_FAILURE(status))
+		status = acpi_video_device_EDID(dev, &edid, 256);
+
+	if (ACPI_SUCCESS(status))
+		if (edid && edid->type == ACPI_TYPE_BUFFER)
+			data = edid->buffer.pointer;
+	return data;
+}
+#endif
+
 /* bus */
 
 static int
@@ -1255,7 +1291,6 @@
 	int status;
 	struct acpi_video_device *data;
 
-
 	if (!device || !video)
 		return -EINVAL;
 
@@ -1263,12 +1298,10 @@
 	    acpi_evaluate_integer(device->handle, "_ADR", NULL, &device_id);
 	if (ACPI_SUCCESS(status)) {
 
-		data = kmalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
+		data = kzalloc(sizeof(struct acpi_video_device), GFP_KERNEL);
 		if (!data)
 			return -ENOMEM;
 
-		memset(data, 0, sizeof(struct acpi_video_device));
-
 		strcpy(acpi_device_name(device), ACPI_VIDEO_DEVICE_NAME);
 		strcpy(acpi_device_class(device), ACPI_VIDEO_CLASS);
 		acpi_driver_data(device) = data;
@@ -1295,6 +1328,13 @@
 		acpi_video_device_bind(video, data);
 		acpi_video_device_find_cap(data);
 
+#if defined(CONFIG_DISPLAY_DDC) || defined(CONFIG_DISPLAY_DDC_MODULE)
+		data->acpi_display_driver.get_power = acpi_display_get_power;
+		data->acpi_display_driver.set_power = acpi_display_set_power;
+		data->acpi_display_driver.probe = probe_edid;
+		data->display = display_device_register(&data->acpi_display_driver,
+						NULL, acpi_display_get_EDID(data));
+#endif
 		status = acpi_install_notify_handler(device->handle,
 						     ACPI_DEVICE_NOTIFY,
 						     acpi_video_device_notify,
diff -urN -X fbdev-2.6/Documentation/dontdiff linus-2.6/drivers/macintosh/Kconfig fbdev-2.6/drivers/macintosh/Kconfig
--- linus-2.6/drivers/macintosh/Kconfig	2006-12-05 05:07:18.000000000 -0500
+++ fbdev-2.6/drivers/macintosh/Kconfig	2006-12-06 05:01:22.000000000 -0500
@@ -123,7 +123,7 @@
 config PMAC_BACKLIGHT
 	bool "Backlight control for LCD screens"
 	depends on ADB_PMU && FB = y && (BROKEN || !PPC64)
-	select FB_BACKLIGHT
+	select BACKLIGHT_CLASS_DEVICE
 	help
 	  Say Y here to enable Macintosh specific extensions of the generic
 	  backlight code. With this enabled, the brightness keys on older
diff -urN -X fbdev-2.6/Documentation/dontdiff linus-2.6/drivers/video/display/display-ddc.c fbdev-2.6/drivers/video/display/display-ddc.c
--- linus-2.6/drivers/video/display/display-ddc.c	1969-12-31 19:00:00.000000000 -0500
+++ fbdev-2.6/drivers/video/display/display-ddc.c	2006-12-06 04:31:24.000000000 -0500
@@ -0,0 +1,49 @@
+/*
+ *  display-ddc.c - EDID parsing code
+ *
+ *  Copyright (C) 2006 James Simmons <jsimmons@...radead.org>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ *  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/module.h>
+#include <linux/display.h>
+#include <linux/err.h>
+#include <linux/ctype.h>
+
+#include <linux/fb.h>
+
+int probe_edid(struct display_device *dev, void *data)
+{
+	struct fb_monspecs spec;
+	ssize_t size;
+
+	if (!data)
+		return 0;
+	size = sizeof(spec.manufacturer) + sizeof(spec.monitor) + sizeof(spec.ascii);
+	dev->name = kzalloc(size, GFP_KERNEL);
+	fb_edid_to_monspecs((unsigned char *) data, &spec);
+	strcpy(dev->name, spec.manufacturer);
+	return snprintf(dev->name, size, "%s %s %s\n", spec.manufacturer,
+			spec.monitor, spec.ascii);
+}
+EXPORT_SYMBOL(probe_edid);
+
+MODULE_DESCRIPTION("Display Hardware handling");
+MODULE_AUTHOR("James Simmons <jsimmons@...radead.org>");
+MODULE_LICENSE("GPL");
diff -urN -X fbdev-2.6/Documentation/dontdiff linus-2.6/drivers/video/display/display-sysfs.c fbdev-2.6/drivers/video/display/display-sysfs.c
--- linus-2.6/drivers/video/display/display-sysfs.c	1969-12-31 19:00:00.000000000 -0500
+++ fbdev-2.6/drivers/video/display/display-sysfs.c	2006-12-06 04:32:15.000000000 -0500
@@ -0,0 +1,161 @@
+/*
+ *  display.c - Display output driver
+ *
+ *  Copyright (C) 2006 James Simmons <jsimmons@...radead.org>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ *  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/module.h>
+#include <linux/display.h>
+#include <linux/err.h>
+#include <linux/ctype.h>
+
+static ssize_t display_show_name(struct class_device *dev, char *buf)
+{
+	struct display_device *dsp = to_display_device(dev);
+	return snprintf(buf, PAGE_SIZE, "%s\n", dsp->name);
+}
+
+static ssize_t display_show_power(struct class_device *dev, char *buf)
+{
+	struct display_device *dsp = to_display_device(dev);
+	ssize_t ret = -ENXIO;
+
+	mutex_lock(&dsp->lock);
+	if (likely(dsp->driver->get_power))
+		ret = sprintf(buf,"%.8x\n", dsp->driver->get_power(dsp));
+	mutex_unlock(&dsp->lock);
+	return ret;
+}
+
+static ssize_t display_store_power(struct class_device *dev,
+	const char *buf,size_t count)
+{
+	struct display_device *dsp = to_display_device(dev);
+	size_t size;
+	char *endp;
+	int power;
+
+	power = simple_strtoul(buf, &endp, 0);
+	size = endp - buf;
+	if (*endp && isspace(*endp))
+		size++;
+	if (size != count)
+		return -EINVAL;
+
+	mutex_lock(&dsp->lock);
+	if (likely(dsp->driver->set_power)) {
+		dsp->request_state = power;
+		dsp->driver->set_power(dsp);
+	}
+	mutex_unlock(&dsp->lock);
+	return count;
+}
+
+static void display_class_release(struct class_device *dev)
+{
+	struct display_device *dsp = to_display_device(dev);
+	kfree(dsp);
+}
+
+static struct class_device_attribute display_attributes[] = {
+	__ATTR(name, S_IRUGO, display_show_name, NULL),
+	__ATTR(power, S_IRUGO | S_IWUSR, display_show_power, display_store_power),
+};
+
+static struct class display_class = {
+	.name = "display",
+	.release = display_class_release,
+	.class_dev_attrs = display_attributes,
+};
+
+static int index;
+
+struct display_device *display_device_register(struct display_driver *driver,
+						struct device *dev, void *devdata)
+{
+	struct display_device *new_dev;
+	int ret = -ENOMEM, i;
+
+	if (unlikely(!driver))
+		return ERR_PTR(-EINVAL);
+
+	new_dev = kzalloc(sizeof(struct display_device), GFP_KERNEL);
+	if (likely(new_dev) && unlikely(driver->probe(new_dev, devdata))) {
+		mutex_init(&new_dev->lock);
+		new_dev->driver = driver;
+		new_dev->class_dev.class = &display_class;
+		new_dev->class_dev.dev = dev;
+		sprintf(new_dev->class_dev.class_id, "display%d", index++);
+		class_set_devdata(&new_dev->class_dev, devdata);
+		ret = class_device_register(&new_dev->class_dev);
+
+		if (likely(ret)) {
+			for (i = 0; i < ARRAY_SIZE(display_attributes); i++) {
+				ret = class_device_create_file(&new_dev->class_dev,
+							&display_attributes[i]);
+				if (unlikely(ret)) {
+					while (--i >= 0)
+						class_device_remove_file(&new_dev->class_dev,
+							&display_attributes[i]);
+					class_device_unregister(&new_dev->class_dev);
+				}
+			}
+		}
+	}
+	if (unlikely(ret)) {
+		kfree(new_dev);
+		new_dev = ERR_PTR(ret);
+	}
+	return new_dev;
+}
+EXPORT_SYMBOL(display_device_register);
+
+void display_device_unregister(struct display_device *dev)
+{
+	int i;
+
+	if (!dev)
+		return;
+	mutex_lock(&dev->lock);
+	dev->driver = NULL;
+	for (i = 0; i < ARRAY_SIZE(display_attributes); i++)
+		class_device_remove_file(&dev->class_dev,
+					&display_attributes[i]);
+	mutex_unlock(&dev->lock);
+	class_device_unregister(&dev->class_dev);
+}
+EXPORT_SYMBOL(display_device_unregister);
+
+static void __exit display_class_exit(void)
+{
+	class_unregister(&display_class);
+}
+
+static int __init display_class_init(void)
+{
+	return class_register(&display_class);
+}
+
+postcore_initcall(display_class_init);
+module_exit(display_class_exit);
+
+MODULE_DESCRIPTION("Display Hardware handling");
+MODULE_AUTHOR("James Simmons <jsimmons@...radead.org>");
+MODULE_LICENSE("GPL");
diff -urN -X fbdev-2.6/Documentation/dontdiff linus-2.6/drivers/video/display/Kconfig fbdev-2.6/drivers/video/display/Kconfig
--- linus-2.6/drivers/video/display/Kconfig	1969-12-31 19:00:00.000000000 -0500
+++ fbdev-2.6/drivers/video/display/Kconfig	2006-12-06 04:50:40.000000000 -0500
@@ -0,0 +1,29 @@
+#
+# Display drivers configuration
+#
+
+menu "Display device support"
+
+config DISPLAY_SUPPORT
+	tristate "Display panel/monitor support"
+	---help---
+	  This framework adds support for low-level control of a display. 
+	  This includes support for power.
+
+	  Enable this to be able to choose the drivers for controlling the
+	  physical display panel/monitor on some platforms. This not only
+	  covers LCD displays for PDAs but also other types of displays
+	  such as CRT, TVout etc.
+
+	  To have support for your specific display panel you will have to
+	  select the proper drivers which depend on this option.
+
+config DISPLAY_DDC
+	tristate "Enable EDID parsing"
+	---help---
+	  Enable EDID parsing
+
+comment "Display hardware drivers"
+	depends on DISPLAY_SUPPORT
+
+endmenu
diff -urN -X fbdev-2.6/Documentation/dontdiff linus-2.6/drivers/video/display/Makefile fbdev-2.6/drivers/video/display/Makefile
--- linus-2.6/drivers/video/display/Makefile	1969-12-31 19:00:00.000000000 -0500
+++ fbdev-2.6/drivers/video/display/Makefile	2006-12-06 04:54:08.000000000 -0500
@@ -0,0 +1,7 @@
+# Display drivers
+
+display-objs				:= display-sysfs.o 
+
+obj-$(CONFIG_DISPLAY_SUPPORT)		+= display.o
+
+obj-$(CONFIG_DISPLAY_DDC)		+= display-ddc.o
diff -urN -X fbdev-2.6/Documentation/dontdiff linus-2.6/drivers/video/Kconfig fbdev-2.6/drivers/video/Kconfig
--- linus-2.6/drivers/video/Kconfig	2006-11-30 05:06:13.000000000 -0500
+++ fbdev-2.6/drivers/video/Kconfig	2006-12-06 05:01:22.000000000 -0500
@@ -4,20 +4,10 @@
 
 menu "Graphics support"
 
-config FIRMWARE_EDID
-       bool "Enable firmware EDID"
-       default y
-       ---help---
-         This enables access to the EDID transferred from the firmware.
-	 On the i386, this is from the Video BIOS. Enable this if DDC/I2C
-	 transfers do not work for your driver and if you are using
-	 nvidiafb, i810fb or savagefb.
-
-	 In general, choosing Y for this option is safe.  If you
-	 experience extremely long delays while booting before you get
-	 something on your display, try setting this to N.  Matrox cards in
-	 combination with certain motherboards and monitors are known to
-	 suffer from this problem.
+if SYSFS
+	source "drivers/video/backlight/Kconfig"
+	source "drivers/video/display/Kconfig"
+endif
 
 config FB
 	tristate "Support for frame buffer devices"
@@ -53,6 +43,22 @@
 	  (e.g. an accelerated X server) and that are not frame buffer
 	  device-aware may cause unexpected results. If unsure, say N.
 
+config FIRMWARE_EDID
+       bool "Enable firmware EDID"
+       depends on FB
+       default n 
+       ---help---
+         This enables access to the EDID transferred from the firmware.
+	 On the i386, this is from the Video BIOS. Enable this if DDC/I2C
+	 transfers do not work for your driver and if you are using
+	 nvidiafb, i810fb or savagefb.
+
+	 In general, choosing Y for this option is safe.  If you
+	 experience extremely long delays while booting before you get
+	 something on your display, try setting this to N.  Matrox cards in
+	 combination with certain motherboards and monitors are known to
+	 suffer from this problem.
+
 config FB_DDC
        tristate
        depends on FB && I2C && I2C_ALGOBIT
@@ -90,13 +96,6 @@
        depends on FB
        default n
 
-config FB_BACKLIGHT
-	bool
-	depends on FB
-	select BACKLIGHT_LCD_SUPPORT
-	select BACKLIGHT_CLASS_DEVICE
-	default n
-
 config FB_MODE_HELPERS
         bool "Enable Video Mode Handling Helpers"
         depends on FB
@@ -126,6 +125,9 @@
 	 This is particularly important to one driver, matroxfb.  If
 	 unsure, say N.
 
+comment "Frambuffer hardware drivers"
+	depends on FB
+
 config FB_CIRRUS
 	tristate "Cirrus Logic support"
 	depends on FB && (ZORRO || PCI)
@@ -551,6 +553,7 @@
 	select FB_CFB_FILLRECT
 	select FB_CFB_COPYAREA
 	select FB_CFB_IMAGEBLIT
+	select VIDEO_SELECT
 	help
 	  This is the frame buffer device driver for generic VESA 2.0
 	  compliant graphic cards. The older VESA 1.2 cards are not supported.
@@ -728,8 +731,7 @@
 
 config FB_NVIDIA_BACKLIGHT
 	bool "Support for backlight control"
-	depends on FB_NVIDIA && PMAC_BACKLIGHT
-	select FB_BACKLIGHT
+	depends on FB_NVIDIA && BACKLIGHT_CLASS_DEVICE
 	default y
 	help
 	  Say Y here if you want to control the backlight of your display.
@@ -775,8 +777,7 @@
 
 config FB_RIVA_BACKLIGHT
 	bool "Support for backlight control"
-	depends on FB_RIVA && PMAC_BACKLIGHT
-	select FB_BACKLIGHT
+	depends on FB_RIVA && BACKLIGHT_CLASS_DEVICE
 	default y
 	help
 	  Say Y here if you want to control the backlight of your display.
@@ -1049,8 +1050,7 @@
 
 config FB_RADEON_BACKLIGHT
 	bool "Support for backlight control"
-	depends on FB_RADEON && PMAC_BACKLIGHT
-	select FB_BACKLIGHT
+	depends on FB_RADEON && BACKLIGHT_CLASS_DEVICE 
 	default y
 	help
 	  Say Y here if you want to control the backlight of your display.
@@ -1081,8 +1081,7 @@
 
 config FB_ATY128_BACKLIGHT
 	bool "Support for backlight control"
-	depends on FB_ATY128 && PMAC_BACKLIGHT
-	select FB_BACKLIGHT
+	depends on FB_ATY128 && BACKLIGHT_CLASS_DEVICE 
 	default y
 	help
 	  Say Y here if you want to control the backlight of your display.
@@ -1131,8 +1130,7 @@
 
 config FB_ATY_BACKLIGHT
 	bool "Support for backlight control"
-	depends on FB_ATY && PMAC_BACKLIGHT
-	select FB_BACKLIGHT
+	depends on FB_ATY && BACKLIGHT_CLASS_DEVICE 
 	default y
 	help
 	  Say Y here if you want to control the backlight of your display.
@@ -1632,6 +1630,7 @@
 	  the vfb_enable=1 option.
 
 	  If unsure, say N.
+
 if VT
 	source "drivers/video/console/Kconfig"
 endif
@@ -1640,9 +1639,5 @@
 	source "drivers/video/logo/Kconfig"
 endif
 
-if SYSFS
-	source "drivers/video/backlight/Kconfig"
-endif
-
 endmenu
 
diff -urN -X fbdev-2.6/Documentation/dontdiff linus-2.6/drivers/video/Makefile fbdev-2.6/drivers/video/Makefile
--- linus-2.6/drivers/video/Makefile	2006-11-07 05:38:36.000000000 -0500
+++ fbdev-2.6/drivers/video/Makefile	2006-12-06 05:01:22.000000000 -0500
@@ -12,7 +12,7 @@
 
 obj-$(CONFIG_VT)		  += console/
 obj-$(CONFIG_LOGO)		  += logo/
-obj-$(CONFIG_SYSFS)		  += backlight/
+obj-$(CONFIG_SYSFS)		  += backlight/ display/
 
 obj-$(CONFIG_FB_CFB_FILLRECT)  += cfbfillrect.o
 obj-$(CONFIG_FB_CFB_COPYAREA)  += cfbcopyarea.o
diff -urN -X fbdev-2.6/Documentation/dontdiff linus-2.6/include/linux/display.h fbdev-2.6/include/linux/display.h
--- linus-2.6/include/linux/display.h	1969-12-31 19:00:00.000000000 -0500
+++ fbdev-2.6/include/linux/display.h	2006-12-05 14:43:54.000000000 -0500
@@ -0,0 +1,55 @@
+/*
+ *  Copyright (C) 2006 James Simmons <jsimmons@...radead.org>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ *  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.
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+
+#ifndef _LINUX_DISPLAY_H
+#define _LINUX_DISPLAY_H
+
+#include <linux/device.h>
+
+struct display_device;
+
+/* This structure defines all the properties of a Display. */
+struct display_driver {
+	int (*set_power)(struct display_device *);
+	int (*get_power)(struct display_device *);
+	int (*probe)(struct display_device *, void *);
+	int (*remove)(struct display_device *);
+};
+
+struct display_device {
+	struct module *owner;	/* Owner module */
+	char *name;
+	struct mutex lock;	
+	int request_state;
+	struct display_driver *driver;
+	struct class_device class_dev;		/* The class device structure */
+};
+
+extern struct display_device *display_device_register(struct display_driver *driver,
+					struct device *dev, void *devdata);
+extern void display_device_unregister(struct display_device *dev);
+
+extern int probe_edid(struct display_device *dev, void *devdata);
+
+#define to_display_device(obj) container_of(obj, struct display_device, class_dev)
+
+#endif
-
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