1 files changed, 402 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_sysfs.c b/drivers/gpu/drm/drm_sysfs.c
new file mode 100644
index 000000000..ecb7b3300
--- /dev/null
+++ b/drivers/gpu/drm/drm_sysfs.c
@@ -0,0 +1,402 @@
+
+/*
+ * drm_sysfs.c - Modifications to drm_sysfs_class.c to support
+ *               extra sysfs attribute from DRM. Normal drm_sysfs_class
+ *               does not allow adding attributes.
+ *
+ * Copyright (c) 2004 Jon Smirl <jonsmirl@gmail.com>
+ * Copyright (c) 2003-2004 Greg Kroah-Hartman <greg@kroah.com>
+ * Copyright (c) 2003-2004 IBM Corp.
+ *
+ * This file is released under the GPLv2
+ *
+ */
+
+#include <linux/device.h>
+#include <linux/kdev_t.h>
+#include <linux/gfp.h>
+#include <linux/err.h>
+#include <linux/export.h>
+
+#include <drm/drm_sysfs.h>
+#include <drm/drmP.h>
+#include "drm_internal.h"
+
+#define to_drm_minor(d) dev_get_drvdata(d)
+#define to_drm_connector(d) dev_get_drvdata(d)
+
+/**
+ * DOC: overview
+ *
+ * DRM provides very little additional support to drivers for sysfs
+ * interactions, beyond just all the standard stuff. Drivers who want to expose
+ * additional sysfs properties and property groups can attach them at either
+ * &drm_device.dev or &drm_connector.kdev.
+ *
+ * Registration is automatically handled when calling drm_dev_register(), or
+ * drm_connector_register() in case of hot-plugged connectors. Unregistration is
+ * also automatically handled by drm_dev_unregister() and
+ * drm_connector_unregister().
+ */
+
+static struct device_type drm_sysfs_device_minor = {
+	.name = "drm_minor"
+};
+
+struct class *drm_class;
+
+static char *drm_devnode(struct device *dev, umode_t *mode)
+{
+	return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev));
+}
+
+static CLASS_ATTR_STRING(version, S_IRUGO, "drm 1.1.0 20060810");
+
+/**
+ * drm_sysfs_init - initialize sysfs helpers
+ *
+ * This is used to create the DRM class, which is the implicit parent of any
+ * other top-level DRM sysfs objects.
+ *
+ * You must call drm_sysfs_destroy() to release the allocated resources.
+ *
+ * Return: 0 on success, negative error code on failure.
+ */
+int drm_sysfs_init(void)
+{
+	int err;
+
+	drm_class = class_create(THIS_MODULE, "drm");
+	if (IS_ERR(drm_class))
+		return PTR_ERR(drm_class);
+
+	err = class_create_file(drm_class, &class_attr_version.attr);
+	if (err) {
+		class_destroy(drm_class);
+		drm_class = NULL;
+		return err;
+	}
+
+	drm_class->devnode = drm_devnode;
+	return 0;
+}
+
+/**
+ * drm_sysfs_destroy - destroys DRM class
+ *
+ * Destroy the DRM device class.
+ */
+void drm_sysfs_destroy(void)
+{
+	if (IS_ERR_OR_NULL(drm_class))
+		return;
+	class_remove_file(drm_class, &class_attr_version.attr);
+	class_destroy(drm_class);
+	drm_class = NULL;
+}
+
+/*
+ * Connector properties
+ */
+static ssize_t status_store(struct device *device,
+			   struct device_attribute *attr,
+			   const char *buf, size_t count)
+{
+	struct drm_connector *connector = to_drm_connector(device);
+	struct drm_device *dev = connector->dev;
+	enum drm_connector_force old_force;
+	int ret;
+
+	ret = mutex_lock_interruptible(&dev->mode_config.mutex);
+	if (ret)
+		return ret;
+
+	old_force = connector->force;
+
+	if (sysfs_streq(buf, "detect"))
+		connector->force = 0;
+	else if (sysfs_streq(buf, "on"))
+		connector->force = DRM_FORCE_ON;
+	else if (sysfs_streq(buf, "on-digital"))
+		connector->force = DRM_FORCE_ON_DIGITAL;
+	else if (sysfs_streq(buf, "off"))
+		connector->force = DRM_FORCE_OFF;
+	else
+		ret = -EINVAL;
+
+	if (old_force != connector->force || !connector->force) {
+		DRM_DEBUG_KMS("[CONNECTOR:%d:%s] force updated from %d to %d or reprobing\n",
+			      connector->base.id,
+			      connector->name,
+			      old_force, connector->force);
+
+		connector->funcs->fill_modes(connector,
+					     dev->mode_config.max_width,
+					     dev->mode_config.max_height);
+	}
+
+	mutex_unlock(&dev->mode_config.mutex);
+
+	return ret ? ret : count;
+}
+
+static ssize_t status_show(struct device *device,
+			   struct device_attribute *attr,
+			   char *buf)
+{
+	struct drm_connector *connector = to_drm_connector(device);
+	enum drm_connector_status status;
+
+	status = READ_ONCE(connector->status);
+
+	return snprintf(buf, PAGE_SIZE, "%s\n",
+			drm_get_connector_status_name(status));
+}
+
+static ssize_t dpms_show(struct device *device,
+			   struct device_attribute *attr,
+			   char *buf)
+{
+	struct drm_connector *connector = to_drm_connector(device);
+	int dpms;
+
+	dpms = READ_ONCE(connector->dpms);
+
+	return snprintf(buf, PAGE_SIZE, "%s\n",
+			drm_get_dpms_name(dpms));
+}
+
+static ssize_t enabled_show(struct device *device,
+			    struct device_attribute *attr,
+			   char *buf)
+{
+	struct drm_connector *connector = to_drm_connector(device);
+	bool enabled;
+
+	enabled = READ_ONCE(connector->encoder);
+
+	return snprintf(buf, PAGE_SIZE, enabled ? "enabled\n" : "disabled\n");
+}
+
+static ssize_t edid_show(struct file *filp, struct kobject *kobj,
+			 struct bin_attribute *attr, char *buf, loff_t off,
+			 size_t count)
+{
+	struct device *connector_dev = kobj_to_dev(kobj);
+	struct drm_connector *connector = to_drm_connector(connector_dev);
+	unsigned char *edid;
+	size_t size;
+	ssize_t ret = 0;
+
+	mutex_lock(&connector->dev->mode_config.mutex);
+	if (!connector->edid_blob_ptr)
+		goto unlock;
+
+	edid = connector->edid_blob_ptr->data;
+	size = connector->edid_blob_ptr->length;
+	if (!edid)
+		goto unlock;
+
+	if (off >= size)
+		goto unlock;
+
+	if (off + count > size)
+		count = size - off;
+	memcpy(buf, edid + off, count);
+
+	ret = count;
+unlock:
+	mutex_unlock(&connector->dev->mode_config.mutex);
+
+	return ret;
+}
+
+static ssize_t modes_show(struct device *device,
+			   struct device_attribute *attr,
+			   char *buf)
+{
+	struct drm_connector *connector = to_drm_connector(device);
+	struct drm_display_mode *mode;
+	int written = 0;
+
+	mutex_lock(&connector->dev->mode_config.mutex);
+	list_for_each_entry(mode, &connector->modes, head) {
+		written += snprintf(buf + written, PAGE_SIZE - written, "%s\n",
+				    mode->name);
+	}
+	mutex_unlock(&connector->dev->mode_config.mutex);
+
+	return written;
+}
+
+static DEVICE_ATTR_RW(status);
+static DEVICE_ATTR_RO(enabled);
+static DEVICE_ATTR_RO(dpms);
+static DEVICE_ATTR_RO(modes);
+
+static struct attribute *connector_dev_attrs[] = {
+	&dev_attr_status.attr,
+	&dev_attr_enabled.attr,
+	&dev_attr_dpms.attr,
+	&dev_attr_modes.attr,
+	NULL
+};
+
+static struct bin_attribute edid_attr = {
+	.attr.name = "edid",
+	.attr.mode = 0444,
+	.size = 0,
+	.read = edid_show,
+};
+
+static struct bin_attribute *connector_bin_attrs[] = {
+	&edid_attr,
+	NULL
+};
+
+static const struct attribute_group connector_dev_group = {
+	.attrs = connector_dev_attrs,
+	.bin_attrs = connector_bin_attrs,
+};
+
+static const struct attribute_group *connector_dev_groups[] = {
+	&connector_dev_group,
+	NULL
+};
+
+int drm_sysfs_connector_add(struct drm_connector *connector)
+{
+	struct drm_device *dev = connector->dev;
+
+	if (connector->kdev)
+		return 0;
+
+	connector->kdev =
+		device_create_with_groups(drm_class, dev->primary->kdev, 0,
+					  connector, connector_dev_groups,
+					  "card%d-%s", dev->primary->index,
+					  connector->name);
+	DRM_DEBUG("adding \"%s\" to sysfs\n",
+		  connector->name);
+
+	if (IS_ERR(connector->kdev)) {
+		DRM_ERROR("failed to register connector device: %ld\n", PTR_ERR(connector->kdev));
+		return PTR_ERR(connector->kdev);
+	}
+
+	/* Let userspace know we have a new connector */
+	drm_sysfs_hotplug_event(dev);
+
+	return 0;
+}
+
+void drm_sysfs_connector_remove(struct drm_connector *connector)
+{
+	if (!connector->kdev)
+		return;
+	DRM_DEBUG("removing \"%s\" from sysfs\n",
+		  connector->name);
+
+	device_unregister(connector->kdev);
+	connector->kdev = NULL;
+}
+
+void drm_sysfs_lease_event(struct drm_device *dev)
+{
+	char *event_string = "LEASE=1";
+	char *envp[] = { event_string, NULL };
+
+	DRM_DEBUG("generating lease event\n");
+
+	kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
+}
+
+/**
+ * drm_sysfs_hotplug_event - generate a DRM uevent
+ * @dev: DRM device
+ *
+ * Send a uevent for the DRM device specified by @dev.  Currently we only
+ * set HOTPLUG=1 in the uevent environment, but this could be expanded to
+ * deal with other types of events.
+ */
+void drm_sysfs_hotplug_event(struct drm_device *dev)
+{
+	char *event_string = "HOTPLUG=1";
+	char *envp[] = { event_string, NULL };
+
+	DRM_DEBUG("generating hotplug event\n");
+
+	kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
+}
+EXPORT_SYMBOL(drm_sysfs_hotplug_event);
+
+static void drm_sysfs_release(struct device *dev)
+{
+	kfree(dev);
+}
+
+struct device *drm_sysfs_minor_alloc(struct drm_minor *minor)
+{
+	const char *minor_str;
+	struct device *kdev;
+	int r;
+
+	if (minor->type == DRM_MINOR_RENDER)
+		minor_str = "renderD%d";
+	else
+		minor_str = "card%d";
+
+	kdev = kzalloc(sizeof(*kdev), GFP_KERNEL);
+	if (!kdev)
+		return ERR_PTR(-ENOMEM);
+
+	device_initialize(kdev);
+	kdev->devt = MKDEV(DRM_MAJOR, minor->index);
+	kdev->class = drm_class;
+	kdev->type = &drm_sysfs_device_minor;
+	kdev->parent = minor->dev->dev;
+	kdev->release = drm_sysfs_release;
+	dev_set_drvdata(kdev, minor);
+
+	r = dev_set_name(kdev, minor_str, minor->index);
+	if (r < 0)
+		goto err_free;
+
+	return kdev;
+
+err_free:
+	put_device(kdev);
+	return ERR_PTR(r);
+}
+
+/**
+ * drm_class_device_register - register new device with the DRM sysfs class
+ * @dev: device to register
+ *
+ * Registers a new &struct device within the DRM sysfs class. Essentially only
+ * used by ttm to have a place for its global settings. Drivers should never use
+ * this.
+ */
+int drm_class_device_register(struct device *dev)
+{
+	if (!drm_class || IS_ERR(drm_class))
+		return -ENOENT;
+
+	dev->class = drm_class;
+	return device_register(dev);
+}
+EXPORT_SYMBOL_GPL(drm_class_device_register);
+
+/**
+ * drm_class_device_unregister - unregister device with the DRM sysfs class
+ * @dev: device to unregister
+ *
+ * Unregisters a &struct device from the DRM sysfs class. Essentially only used
+ * by ttm to have a place for its global settings. Drivers should never use
+ * this.
+ */
+void drm_class_device_unregister(struct device *dev)
+{
+	return device_unregister(dev);
+}
+EXPORT_SYMBOL_GPL(drm_class_device_unregister);