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SubjectDisplay class

This is the pass at a display class to meet the needs of the output 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.


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 2006-12-04 10:40:48.000000000 -0500
@@ -30,6 +30,9 @@
#include <linux/list.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
+#if defined(CONFIG_DISPLAY_DDC)
+#include <linux/display.h>
+#endif

#include <asm/uaccess.h>

@@ -154,6 +157,20 @@
int *levels;
};

+#if defined(CONFIG_DISPLAY_DDC)
+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 +179,10 @@
struct acpi_video_bus *video;
struct acpi_device *dev;
struct acpi_video_device_brightness *brightness;
+#if defined(CONFIG_DISPLAY_DDC)
+ struct display_properties acpi_display_properties;
+ struct display_device *display;
+#endif
};

/* bus */
@@ -399,6 +420,27 @@
return status;
}

+#if defined(CONFIG_DISPLAY_DDC)
+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 +1297,6 @@
int status;
struct acpi_video_device *data;

-
if (!device || !video)
return -EINVAL;

@@ -1263,12 +1304,10 @@
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 +1334,13 @@
acpi_video_device_bind(video, data);
acpi_video_device_find_cap(data);

+#ifdef CONFIG_DISPLAY_DDC
+ data->acpi_display_properties.get_power = acpi_display_get_power;
+ data->acpi_display_properties.set_power = acpi_display_set_power;
+ data->acpi_display_properties.probe = probe_edid;
+ data->display = display_device_register(NULL, acpi_display_get_EDID(data),
+ &data->acpi_display_properties);
+#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/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 2006-12-03 05:27:00.000000000 -0500
@@ -0,0 +1,45 @@
+/*
+ * display-ddc.c - EDID paring code
+ *
+ * Copyright (C) 2006 James Simmons <jsimmons@infradead.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 = 45;
+
+ 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@infradead.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 2006-12-04 07:48:34.000000000 -0500
@@ -0,0 +1,164 @@
+/*
+ * display.c - Display output driver
+ *
+ * Copyright (C) 2006 James Simmons <jsimmons@infradead.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)) {
+ 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)) {
+ printk("failed to register display device\n");
+ 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@infradead.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 2006-12-04 11:41:03.000000000 -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 2006-12-03 05:02:07.000000000 -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 2006-12-04 10:40:48.000000000 -0500
@@ -4,21 +4,6 @@

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.
-
config FB
tristate "Support for frame buffer devices"
---help---
@@ -53,6 +38,22 @@
(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
@@ -126,6 +127,9 @@
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)
@@ -1641,6 +1647,7 @@
endif

if SYSFS
+ source "drivers/video/display/Kconfig"
source "drivers/video/backlight/Kconfig"
endif

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 2006-12-04 10:40:48.000000000 -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 2006-12-04 07:42:29.000000000 -0500
@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2006 James Simmons <jsimmons@infradead.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
diff -urN -X fbdev-2.6/Documentation/dontdiff linus-2.6/MAINTAINERS fbdev-2.6/MAINTAINERS
--- linus-2.6/MAINTAINERS 2006-12-04 04:11:38.000000000 -0500
+++ fbdev-2.6/MAINTAINERS 2006-12-04 10:40:48.000000000 -0500
@@ -911,6 +923,12 @@
L: linux-kernel@vger.kernel.org
S: Maintained

+DISPLAY SUBSYSTEM
+P: James Simmons
+M: jsimmons@infradead.org
+L: linux-kernel@vger.kernel.org
+S: Maintained
+
DISTRIBUTED LOCK MANAGER
P: Patrick Caulfield
M: pcaulfie@redhat.com
-
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