Re: Display class

From: James Simmons
Date: Sat Jan 13 2007 - 17:42:02 EST

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> Hi,
>
> On Tuesday 05 December 2006 13:03, James Simmons wrote:
> > +int probe_edid(struct display_device *dev, void *data)
> > +{
> > + struct fb_monspecs spec;
> > + ssize_t size = 45;

That code was only for testing. I do have new core code. Andrew could
you merge this patch as it is against the -mm tree.

This new class provides a way common interface for various types of
displays such as LCD, CRT, LVDS etc. It is a expansion of the lcd
class to include other types of displays.

diff -urN linux-2.6.20-rc3/drivers/video/display/display-sysfs.c linux-2.6.20-rc3-display/drivers/video/display/display-sysfs.c
--- linux-2.6.20-rc3/drivers/video/display/display-sysfs.c 1969-12-31 19:00:00.000000000 -0500
+++ linux-2.6.20-rc3-display/drivers/video/display/display-sysfs.c 2007-01-13 16:22:54.000000000 -0500
@@ -0,0 +1,208 @@
+/*
+ * display.c - Display output driver
+ *
+ * Copyright (C) 2007 James Simmons <jsimmons@xxxxxxxxxxxxx>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * 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 *cdev, char *buf)
+{
+ struct display_device *dsp = to_display_device(cdev);
+ return snprintf(buf, PAGE_SIZE, "%s\n", dsp->name);
+}
+
+static ssize_t display_show_type(struct class_device *cdev, char *buf)
+{
+ struct display_device *dsp = to_display_device(cdev);
+ return snprintf(buf, PAGE_SIZE, "%s\n", dsp->driver->type);
+}
+
+static ssize_t display_show_power(struct class_device *cdev, char *buf)
+{
+ struct display_device *dsp = to_display_device(cdev);
+ 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 *cdev,
+ const char *buf, size_t count)
+{
+ struct display_device *dsp = to_display_device(cdev);
+ ssize_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 ssize_t display_show_contrast(struct class_device *cdev, char *buf)
+{
+ struct display_device *dsp = to_display_device(cdev);
+ ssize_t rc = -ENXIO;
+
+ mutex_lock(&dsp->lock);
+ if (likely(dsp->driver) && dsp->driver->get_contrast)
+ rc = sprintf(buf, "%d\n", dsp->driver->get_contrast(dsp));
+ mutex_unlock(&dsp->lock);
+ return rc;
+}
+
+static ssize_t display_store_contrast(struct class_device *cdev, const char *buf, size_t count)
+{
+
+ struct display_device *dsp = to_display_device(cdev);
+ ssize_t ret = -EINVAL, size;
+ int contrast;
+ char *endp;
+
+ contrast = simple_strtoul(buf, &endp, 0);
+ size = endp - buf;
+
+ if (*endp && isspace(*endp))
+ size++;
+
+ if (size != count)
+ return ret;
+
+ mutex_lock(&dsp->lock);
+ if (likely(dsp->driver && dsp->driver->set_contrast)) {
+ pr_debug("display: set contrast to %d\n", contrast);
+ dsp->driver->set_contrast(dsp, contrast);
+ ret = count;
+ }
+ mutex_unlock(&dsp->lock);
+ return ret;
+}
+
+static ssize_t display_show_max_contrast(struct class_device *cdev, char *buf)
+{
+ struct display_device *dsp = to_display_device(cdev);
+ ssize_t rc = -ENXIO;
+
+ mutex_lock(&dsp->lock);
+ if (likely(dsp->driver))
+ rc = sprintf(buf, "%d\n", dsp->driver->max_contrast);
+ mutex_unlock(&dsp->lock);
+ return rc;
+}
+
+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(type, S_IRUGO, display_show_type, NULL),
+ __ATTR(power, S_IRUGO | S_IWUSR, display_show_power, display_store_power),
+ __ATTR(contrast, S_IRUGO | S_IWUSR, display_show_contrast, display_store_contrast),
+ __ATTR(max_contrast, S_IRUGO, display_show_max_contrast, NULL),
+};
+
+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;
+
+ 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->class_dev.groups = &driver->type_prop;
+ new_dev->class_dev.class = &display_class;
+ new_dev->class_dev.dev = dev;
+ new_dev->driver = driver;
+
+ 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 (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)
+{
+ if (!dev)
+ return;
+ mutex_lock(&dev->lock);
+ class_device_unregister(&dev->class_dev);
+ dev->driver = NULL;
+ index--;
+ mutex_unlock(&dev->lock);
+ kfree(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@xxxxxxxxxxxxx>");
+MODULE_LICENSE("GPL");
diff -urN linux-2.6.20-rc3/drivers/video/display/Kconfig linux-2.6.20-rc3-display/drivers/video/display/Kconfig
--- linux-2.6.20-rc3/drivers/video/display/Kconfig 1969-12-31 19:00:00.000000000 -0500
+++ linux-2.6.20-rc3-display/drivers/video/display/Kconfig 2007-01-13 16:00:51.000000000 -0500
@@ -0,0 +1,24 @@
+#
+# 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.
+
+comment "Display hardware drivers"
+ depends on DISPLAY_SUPPORT
+
+endmenu
diff -urN linux-2.6.20-rc3/drivers/video/display/Makefile linux-2.6.20-rc3-display/drivers/video/display/Makefile
--- linux-2.6.20-rc3/drivers/video/display/Makefile 1969-12-31 19:00:00.000000000 -0500
+++ linux-2.6.20-rc3-display/drivers/video/display/Makefile 2007-01-13 16:01:03.000000000 -0500
@@ -0,0 +1,6 @@
+# Display drivers
+
+display-objs := display-sysfs.o
+
+obj-$(CONFIG_DISPLAY_SUPPORT) += display.o
+
diff -urN linux-2.6.20-rc3/drivers/video/Kconfig linux-2.6.20-rc3-display/drivers/video/Kconfig
--- linux-2.6.20-rc3/drivers/video/Kconfig 2007-01-08 14:00:26.000000000 -0500
+++ linux-2.6.20-rc3-display/drivers/video/Kconfig 2007-01-13 09:23:03.000000000 -0500
@@ -6,6 +6,7 @@

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

config FB
diff -urN linux-2.6.20-rc3/drivers/video/Makefile linux-2.6.20-rc3-display/drivers/video/Makefile
--- linux-2.6.20-rc3/drivers/video/Makefile 2007-01-08 14:00:26.000000000 -0500
+++ linux-2.6.20-rc3-display/drivers/video/Makefile 2007-01-13 09:22:40.000000000 -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 linux-2.6.20-rc3/include/linux/display.h linux-2.6.20-rc3-display/include/linux/display.h
--- linux-2.6.20-rc3/include/linux/display.h 1969-12-31 19:00:00.000000000 -0500
+++ linux-2.6.20-rc3-display/include/linux/display.h 2007-01-13 16:23:51.000000000 -0500
@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2006 James Simmons <jsimmons@xxxxxxxxxxxxx>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * 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 (*set_contrast)(struct display_device *, unsigned int);
+ int (*get_contrast)(struct display_device *);
+ int (*probe)(struct display_device *, void *);
+ int (*remove)(struct display_device *);
+ struct attribute_group *type_prop;
+ int max_contrast;
+ char type[16];
+};
+
+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 display_probe_edid(struct display_device *dev, void *devdata);
+
+#define to_display_device(obj) container_of(obj, struct display_device, class_dev)
+
+#endif

Next message: Pierre Ossman: "Re: [-mm patch] make mmc_sysfs.c:mmc_key_type static"
Previous message: OGAWA Hirofumi: "[PATCH -mm] MMCONFIG: Reject a broken MCFG tables on Asus etc"
Next in thread: James Simmons: "Re: [Linux-fbdev-devel] Display class"
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