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@@ -0,0 +1,217 @@
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+/*
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+ * display-sysfs.c - Display output driver sysfs interface
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+ *
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+ * Copyright (C) 2007 James Simmons <jsimmons@infradead.org>
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+ *
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+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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+ *
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+ * This program is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation; either version 2 of the License, or (at
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+ * your option) any later version.
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+ *
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+ * This program is distributed in the hope that it will be useful, but
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+ * WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ * General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License along
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+ * with this program; if not, write to the Free Software Foundation, Inc.,
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+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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+ *
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+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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+ */
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+#include <linux/module.h>
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+#include <linux/display.h>
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+#include <linux/ctype.h>
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+#include <linux/idr.h>
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+#include <linux/err.h>
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+
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+static ssize_t display_show_name(struct device *dev,
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+ struct device_attribute *attr, char *buf)
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+{
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+ struct display_device *dsp = dev_get_drvdata(dev);
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+ return snprintf(buf, PAGE_SIZE, "%s\n", dsp->name);
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+}
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+
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+static ssize_t display_show_type(struct device *dev,
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+ struct device_attribute *attr, char *buf)
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+{
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+ struct display_device *dsp = dev_get_drvdata(dev);
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+ return snprintf(buf, PAGE_SIZE, "%s\n", dsp->type);
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+}
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+
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+static ssize_t display_show_contrast(struct device *dev,
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+ struct device_attribute *attr, char *buf)
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+{
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+ struct display_device *dsp = dev_get_drvdata(dev);
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+ ssize_t rc = -ENXIO;
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+
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+ mutex_lock(&dsp->lock);
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+ if (likely(dsp->driver) && dsp->driver->get_contrast)
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+ rc = sprintf(buf, "%d\n", dsp->driver->get_contrast(dsp));
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+ mutex_unlock(&dsp->lock);
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+ return rc;
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+}
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+
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+static ssize_t display_store_contrast(struct device *dev,
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+ struct device_attribute *attr,
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+ const char *buf, size_t count)
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+{
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+ struct display_device *dsp = dev_get_drvdata(dev);
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+ ssize_t ret = -EINVAL, size;
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+ int contrast;
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+ char *endp;
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+
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+ contrast = simple_strtoul(buf, &endp, 0);
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+ size = endp - buf;
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+
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+ if (*endp && isspace(*endp))
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+ size++;
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+
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+ if (size != count)
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+ return ret;
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+
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+ mutex_lock(&dsp->lock);
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+ if (likely(dsp->driver && dsp->driver->set_contrast)) {
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+ pr_debug("display: set contrast to %d\n", contrast);
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+ dsp->driver->set_contrast(dsp, contrast);
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+ ret = count;
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+ }
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+ mutex_unlock(&dsp->lock);
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+ return ret;
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+}
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+
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+static ssize_t display_show_max_contrast(struct device *dev,
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+ struct device_attribute *attr,
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+ char *buf)
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+{
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+ struct display_device *dsp = dev_get_drvdata(dev);
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+ ssize_t rc = -ENXIO;
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+
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+ mutex_lock(&dsp->lock);
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+ if (likely(dsp->driver))
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+ rc = sprintf(buf, "%d\n", dsp->driver->max_contrast);
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+ mutex_unlock(&dsp->lock);
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+ return rc;
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+}
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+
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+static struct device_attribute display_attrs[] = {
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+ __ATTR(name, S_IRUGO, display_show_name, NULL),
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+ __ATTR(type, S_IRUGO, display_show_type, NULL),
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+ __ATTR(contrast, S_IRUGO | S_IWUSR, display_show_contrast, display_store_contrast),
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+ __ATTR(max_contrast, S_IRUGO, display_show_max_contrast, NULL),
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+};
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+
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+static int display_suspend(struct device *dev, pm_message_t state)
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+{
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+ struct display_device *dsp = dev_get_drvdata(dev);
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+
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+ mutex_lock(&dsp->lock);
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+ if (likely(dsp->driver->suspend))
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+ dsp->driver->suspend(dsp, state);
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+ mutex_unlock(&dsp->lock);
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+ return 0;
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+};
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+
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+static int display_resume(struct device *dev)
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+{
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+ struct display_device *dsp = dev_get_drvdata(dev);
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+
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+ mutex_lock(&dsp->lock);
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+ if (likely(dsp->driver->resume))
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+ dsp->driver->resume(dsp);
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+ mutex_unlock(&dsp->lock);
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+ return 0;
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+};
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+
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+static struct mutex allocated_dsp_lock;
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+static DEFINE_IDR(allocated_dsp);
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+struct class *display_class;
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+
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+struct display_device *display_device_register(struct display_driver *driver,
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+ struct device *parent, void *devdata)
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+{
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+ struct display_device *new_dev = NULL;
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+ int ret = -EINVAL;
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+
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+ if (unlikely(!driver))
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+ return ERR_PTR(ret);
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+
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+ mutex_lock(&allocated_dsp_lock);
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+ ret = idr_pre_get(&allocated_dsp, GFP_KERNEL);
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+ mutex_unlock(&allocated_dsp_lock);
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+ if (!ret)
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+ return ERR_PTR(ret);
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+
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+ new_dev = kzalloc(sizeof(struct display_device), GFP_KERNEL);
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+ if (likely(new_dev) && unlikely(driver->probe(new_dev, devdata))) {
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+ // Reserve the index for this display
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+ mutex_lock(&allocated_dsp_lock);
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+ ret = idr_get_new(&allocated_dsp, new_dev, &new_dev->idx);
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+ mutex_unlock(&allocated_dsp_lock);
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+
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+ if (!ret) {
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+ new_dev->dev = device_create(display_class, parent, 0,
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+ "display%d", new_dev->idx);
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+ if (!IS_ERR(new_dev->dev)) {
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+ dev_set_drvdata(new_dev->dev, new_dev);
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+ new_dev->parent = parent;
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+ new_dev->driver = driver;
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+ mutex_init(&new_dev->lock);
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+ return new_dev;
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+ }
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+ mutex_lock(&allocated_dsp_lock);
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+ idr_remove(&allocated_dsp, new_dev->idx);
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+ mutex_unlock(&allocated_dsp_lock);
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+ ret = -EINVAL;
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+ }
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+ }
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+ kfree(new_dev);
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+ return ERR_PTR(ret);
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+}
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+EXPORT_SYMBOL(display_device_register);
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+
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+void display_device_unregister(struct display_device *ddev)
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+{
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+ if (!ddev)
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+ return;
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+ // Free device
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+ mutex_lock(&ddev->lock);
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+ device_unregister(ddev->dev);
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+ mutex_unlock(&ddev->lock);
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+ // Mark device index as avaliable
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+ mutex_lock(&allocated_dsp_lock);
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+ idr_remove(&allocated_dsp, ddev->idx);
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+ mutex_unlock(&allocated_dsp_lock);
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+ kfree(ddev);
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+}
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+EXPORT_SYMBOL(display_device_unregister);
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+
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+static int __init display_class_init(void)
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+{
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+ display_class = class_create(THIS_MODULE, "display");
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+ if (IS_ERR(display_class)) {
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+ printk(KERN_ERR "Failed to create display class\n");
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+ display_class = NULL;
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+ return -EINVAL;
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+ }
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+ display_class->dev_attrs = display_attrs;
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+ display_class->suspend = display_suspend;
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+ display_class->resume = display_resume;
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+ mutex_init(&allocated_dsp_lock);
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+ return 0;
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+}
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+
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+static void __exit display_class_exit(void)
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+{
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+ class_destroy(display_class);
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+}
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+
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+module_init(display_class_init);
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+module_exit(display_class_exit);
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+
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+MODULE_DESCRIPTION("Display Hardware handling");
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+MODULE_AUTHOR("James Simmons <jsimmons@infradead.org>");
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+MODULE_LICENSE("GPL");
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+
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James Simmons