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SubjectRe: [PATCH] display class

How does this look? The new and improved display class.

Signed-Off: James Simmons <jsimmons@infradead.org>


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 2007-02-28 10:09:47.000000000 -0500
@@ -0,0 +1,217 @@
+/*
+ * display-sysfs.c - Display output driver sysfs interface
+ *
+ * Copyright (C) 2007 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/ctype.h>
+#include <linux/idr.h>
+#include <linux/err.h>
+
+static ssize_t display_show_name(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct display_device *dsp = dev_get_drvdata(dev);
+ return snprintf(buf, PAGE_SIZE, "%s\n", dsp->name);
+}
+
+static ssize_t display_show_type(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct display_device *dsp = dev_get_drvdata(dev);
+ return snprintf(buf, PAGE_SIZE, "%s\n", dsp->type);
+}
+
+static ssize_t display_show_contrast(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct display_device *dsp = dev_get_drvdata(dev);
+ 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 device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct display_device *dsp = dev_get_drvdata(dev);
+ 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 device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct display_device *dsp = dev_get_drvdata(dev);
+ 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 struct device_attribute display_attrs[] = {
+ __ATTR(name, S_IRUGO, display_show_name, NULL),
+ __ATTR(type, S_IRUGO, display_show_type, NULL),
+ __ATTR(contrast, S_IRUGO | S_IWUSR, display_show_contrast, display_store_contrast),
+ __ATTR(max_contrast, S_IRUGO, display_show_max_contrast, NULL),
+};
+
+static int display_suspend(struct device *dev, pm_message_t state)
+{
+ struct display_device *dsp = dev_get_drvdata(dev);
+
+ mutex_lock(&dsp->lock);
+ if (likely(dsp->driver->suspend))
+ dsp->driver->suspend(dsp, state);
+ mutex_unlock(&dsp->lock);
+ return 0;
+};
+
+static int display_resume(struct device *dev)
+{
+ struct display_device *dsp = dev_get_drvdata(dev);
+
+ mutex_lock(&dsp->lock);
+ if (likely(dsp->driver->resume))
+ dsp->driver->resume(dsp);
+ mutex_unlock(&dsp->lock);
+ return 0;
+};
+
+static struct mutex allocated_dsp_lock;
+static DEFINE_IDR(allocated_dsp);
+struct class *display_class;
+
+struct display_device *display_device_register(struct display_driver *driver,
+ struct device *parent, void *devdata)
+{
+ struct display_device *new_dev = NULL;
+ int ret = -EINVAL;
+
+ if (unlikely(!driver))
+ return ERR_PTR(ret);
+
+ mutex_lock(&allocated_dsp_lock);
+ ret = idr_pre_get(&allocated_dsp, GFP_KERNEL);
+ mutex_unlock(&allocated_dsp_lock);
+ if (!ret)
+ return ERR_PTR(ret);
+
+ new_dev = kzalloc(sizeof(struct display_device), GFP_KERNEL);
+ if (likely(new_dev) && unlikely(driver->probe(new_dev, devdata))) {
+ // Reserve the index for this display
+ mutex_lock(&allocated_dsp_lock);
+ ret = idr_get_new(&allocated_dsp, new_dev, &new_dev->idx);
+ mutex_unlock(&allocated_dsp_lock);
+
+ if (!ret) {
+ new_dev->dev = device_create(display_class, parent, 0,
+ "display%d", new_dev->idx);
+ if (!IS_ERR(new_dev->dev)) {
+ dev_set_drvdata(new_dev->dev, new_dev);
+ new_dev->parent = parent;
+ new_dev->driver = driver;
+ mutex_init(&new_dev->lock);
+ return new_dev;
+ }
+ mutex_lock(&allocated_dsp_lock);
+ idr_remove(&allocated_dsp, new_dev->idx);
+ mutex_unlock(&allocated_dsp_lock);
+ ret = -EINVAL;
+ }
+ }
+ kfree(new_dev);
+ return ERR_PTR(ret);
+}
+EXPORT_SYMBOL(display_device_register);
+
+void display_device_unregister(struct display_device *ddev)
+{
+ if (!ddev)
+ return;
+ // Free device
+ mutex_lock(&ddev->lock);
+ device_unregister(ddev->dev);
+ mutex_unlock(&ddev->lock);
+ // Mark device index as avaliable
+ mutex_lock(&allocated_dsp_lock);
+ idr_remove(&allocated_dsp, ddev->idx);
+ mutex_unlock(&allocated_dsp_lock);
+ kfree(ddev);
+}
+EXPORT_SYMBOL(display_device_unregister);
+
+static int __init display_class_init(void)
+{
+ display_class = class_create(THIS_MODULE, "display");
+ if (IS_ERR(display_class)) {
+ printk(KERN_ERR "Failed to create display class\n");
+ display_class = NULL;
+ return -EINVAL;
+ }
+ display_class->dev_attrs = display_attrs;
+ display_class->suspend = display_suspend;
+ display_class->resume = display_resume;
+ mutex_init(&allocated_dsp_lock);
+ return 0;
+}
+
+static void __exit display_class_exit(void)
+{
+ class_destroy(display_class);
+}
+
+module_init(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 2007-02-28 10:06:38.000000000 -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 -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 2007-02-28 10:06:30.000000000 -0500
@@ -0,0 +1,6 @@
+# Display drivers
+
+display-objs := display-sysfs.o
+
+obj-$(CONFIG_DISPLAY_SUPPORT) += display.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 2007-02-21 10:59:24.000000000 -0500
+++ fbdev-2.6/drivers/video/Kconfig 2007-02-28 09:10:14.000000000 -0500
@@ -5,6 +5,7 @@
menu "Graphics support"

source "drivers/video/backlight/Kconfig"
+source "drivers/video/display/Kconfig"

config FB
tristate "Support for frame buffer devices"
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 2007-02-21 10:59:24.000000000 -0500
+++ fbdev-2.6/drivers/video/Makefile 2007-02-28 09:10:14.000000000 -0500
@@ -12,7 +12,7 @@

obj-$(CONFIG_VT) += console/
obj-$(CONFIG_LOGO) += logo/
-obj-y += backlight/
+obj-y += 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 2007-02-24 11:09:13.000000000 -0500
@@ -0,0 +1,61 @@
+/*
+ * 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_contrast)(struct display_device *, unsigned int);
+ int (*get_contrast)(struct display_device *);
+ void (*suspend)(struct display_device *, pm_message_t state);
+ void (*resume)(struct display_device *);
+ int (*probe)(struct display_device *, void *);
+ int (*remove)(struct display_device *);
+ int max_contrast;
+};
+
+struct display_device {
+ struct module *owner; /* Owner module */
+ struct display_driver *driver;
+ struct device *parent; /* This is the parent */
+ struct device *dev; /* This is this display device */
+ struct mutex lock;
+ void *priv_data;
+ char type[16];
+ char *name;
+ int idx;
+};
+
+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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