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* drm_sysfs.c - Modifications to drm_sysfs_class.c to support
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* extra sysfs attribute from DRM. Normal drm_sysfs_class
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* does not allow adding attributes.
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* Copyright (c) 2004 Jon Smirl <jonsmirl@gmail.com>
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* Copyright (c) 2003-2004 Greg Kroah-Hartman <greg@kroah.com>
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* Copyright (c) 2003-2004 IBM Corp.
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* This file is released under the GPLv2
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#include <linux/device.h>
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#include <linux/kdev_t.h>
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#include <linux/gfp.h>
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#include <linux/err.h>
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#include <linux/export.h>
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#include "drm_sysfs.h"
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#define to_drm_minor(d) container_of(d, struct drm_minor, kdev)
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#define to_drm_connector(d) container_of(d, struct drm_connector, kdev)
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static struct device_type drm_sysfs_device_minor = {
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* drm_class_suspend - DRM class suspend hook
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* @dev: Linux device to suspend
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* @state: power state to enter
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* Just figures out what the actual struct drm_device associated with
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* @dev is and calls its suspend hook, if present.
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static int drm_class_suspend(struct device *dev, pm_message_t state)
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if (dev->type == &drm_sysfs_device_minor) {
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struct drm_minor *drm_minor = to_drm_minor(dev);
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struct drm_device *drm_dev = drm_minor->dev;
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if (drm_minor->type == DRM_MINOR_LEGACY &&
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!drm_core_check_feature(drm_dev, DRIVER_MODESET) &&
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drm_dev->driver->suspend)
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return drm_dev->driver->suspend(drm_dev, state);
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* drm_class_resume - DRM class resume hook
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* @dev: Linux device to resume
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* Just figures out what the actual struct drm_device associated with
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* @dev is and calls its resume hook, if present.
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static int drm_class_resume(struct device *dev)
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if (dev->type == &drm_sysfs_device_minor) {
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struct drm_minor *drm_minor = to_drm_minor(dev);
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struct drm_device *drm_dev = drm_minor->dev;
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if (drm_minor->type == DRM_MINOR_LEGACY &&
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!drm_core_check_feature(drm_dev, DRIVER_MODESET) &&
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drm_dev->driver->resume)
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return drm_dev->driver->resume(drm_dev);
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static char *drm_devnode(struct device *dev, mode_t *mode)
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return kasprintf(GFP_KERNEL, "dri/%s", dev_name(dev));
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static CLASS_ATTR_STRING(version, S_IRUGO,
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__stringify(CORE_MAJOR) "."
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__stringify(CORE_MINOR) "."
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__stringify(CORE_PATCHLEVEL) " "
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* drm_sysfs_create - create a struct drm_sysfs_class structure
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* @owner: pointer to the module that is to "own" this struct drm_sysfs_class
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* @name: pointer to a string for the name of this class.
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* This is used to create DRM class pointer that can then be used
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* in calls to drm_sysfs_device_add().
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* Note, the pointer created here is to be destroyed when finished by making a
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* call to drm_sysfs_destroy().
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struct class *drm_sysfs_create(struct module *owner, char *name)
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class = class_create(owner, name);
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err = PTR_ERR(class);
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class->suspend = drm_class_suspend;
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class->resume = drm_class_resume;
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err = class_create_file(class, &class_attr_version.attr);
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class->devnode = drm_devnode;
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class_destroy(class);
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* drm_sysfs_destroy - destroys DRM class
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* Destroy the DRM device class.
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void drm_sysfs_destroy(void)
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if ((drm_class == NULL) || (IS_ERR(drm_class)))
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class_remove_file(drm_class, &class_attr_version.attr);
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class_destroy(drm_class);
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* drm_sysfs_device_release - do nothing
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* Normally, this would free the DRM device associated with @dev, along
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* with cleaning up any other stuff. But we do that in the DRM core, so
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* this function can just return and hope that the core does its job.
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static void drm_sysfs_device_release(struct device *dev)
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memset(dev, 0, sizeof(struct device));
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* Connector properties
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static ssize_t status_show(struct device *device,
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struct device_attribute *attr,
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struct drm_connector *connector = to_drm_connector(device);
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enum drm_connector_status status;
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ret = mutex_lock_interruptible(&connector->dev->mode_config.mutex);
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status = connector->funcs->detect(connector, true);
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mutex_unlock(&connector->dev->mode_config.mutex);
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return snprintf(buf, PAGE_SIZE, "%s\n",
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drm_get_connector_status_name(status));
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static ssize_t dpms_show(struct device *device,
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struct device_attribute *attr,
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struct drm_connector *connector = to_drm_connector(device);
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struct drm_device *dev = connector->dev;
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uint64_t dpms_status;
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ret = drm_connector_property_get_value(connector,
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dev->mode_config.dpms_property,
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return snprintf(buf, PAGE_SIZE, "%s\n",
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drm_get_dpms_name((int)dpms_status));
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static ssize_t enabled_show(struct device *device,
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struct device_attribute *attr,
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struct drm_connector *connector = to_drm_connector(device);
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return snprintf(buf, PAGE_SIZE, "%s\n", connector->encoder ? "enabled" :
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static ssize_t edid_show(struct file *filp, struct kobject *kobj,
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struct bin_attribute *attr, char *buf, loff_t off,
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struct device *connector_dev = container_of(kobj, struct device, kobj);
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struct drm_connector *connector = to_drm_connector(connector_dev);
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if (!connector->edid_blob_ptr)
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edid = connector->edid_blob_ptr->data;
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size = connector->edid_blob_ptr->length;
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if (off + count > size)
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memcpy(buf, edid + off, count);
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static ssize_t modes_show(struct device *device,
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struct device_attribute *attr,
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struct drm_connector *connector = to_drm_connector(device);
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struct drm_display_mode *mode;
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list_for_each_entry(mode, &connector->modes, head) {
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written += snprintf(buf + written, PAGE_SIZE - written, "%s\n",
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static ssize_t subconnector_show(struct device *device,
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struct device_attribute *attr,
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struct drm_connector *connector = to_drm_connector(device);
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struct drm_device *dev = connector->dev;
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struct drm_property *prop = NULL;
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uint64_t subconnector;
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switch (connector->connector_type) {
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case DRM_MODE_CONNECTOR_DVII:
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prop = dev->mode_config.dvi_i_subconnector_property;
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case DRM_MODE_CONNECTOR_Composite:
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case DRM_MODE_CONNECTOR_SVIDEO:
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case DRM_MODE_CONNECTOR_Component:
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case DRM_MODE_CONNECTOR_TV:
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prop = dev->mode_config.tv_subconnector_property;
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DRM_ERROR("Wrong connector type for this property\n");
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DRM_ERROR("Unable to find subconnector property\n");
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ret = drm_connector_property_get_value(connector, prop, &subconnector);
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return snprintf(buf, PAGE_SIZE, "%s", is_tv ?
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drm_get_tv_subconnector_name((int)subconnector) :
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drm_get_dvi_i_subconnector_name((int)subconnector));
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static ssize_t select_subconnector_show(struct device *device,
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struct device_attribute *attr,
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struct drm_connector *connector = to_drm_connector(device);
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struct drm_device *dev = connector->dev;
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struct drm_property *prop = NULL;
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uint64_t subconnector;
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switch (connector->connector_type) {
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case DRM_MODE_CONNECTOR_DVII:
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prop = dev->mode_config.dvi_i_select_subconnector_property;
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case DRM_MODE_CONNECTOR_Composite:
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case DRM_MODE_CONNECTOR_SVIDEO:
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case DRM_MODE_CONNECTOR_Component:
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case DRM_MODE_CONNECTOR_TV:
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prop = dev->mode_config.tv_select_subconnector_property;
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DRM_ERROR("Wrong connector type for this property\n");
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DRM_ERROR("Unable to find select subconnector property\n");
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ret = drm_connector_property_get_value(connector, prop, &subconnector);
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return snprintf(buf, PAGE_SIZE, "%s", is_tv ?
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drm_get_tv_select_name((int)subconnector) :
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drm_get_dvi_i_select_name((int)subconnector));
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static struct device_attribute connector_attrs[] = {
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/* These attributes are for both DVI-I connectors and all types of tv-out. */
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static struct device_attribute connector_attrs_opt1[] = {
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__ATTR_RO(subconnector),
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__ATTR_RO(select_subconnector),
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static struct bin_attribute edid_attr = {
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* drm_sysfs_connector_add - add an connector to sysfs
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* @connector: connector to add
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* Create an connector device in sysfs, along with its associated connector
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* properties (so far, connection status, dpms, mode list & edid) and
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* generate a hotplug event so userspace knows there's a new connector
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* This routine should only be called *once* for each DRM minor registered.
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* A second call for an already registered device will trigger the BUG_ON
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int drm_sysfs_connector_add(struct drm_connector *connector)
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struct drm_device *dev = connector->dev;
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/* We shouldn't get called more than once for the same connector */
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BUG_ON(device_is_registered(&connector->kdev));
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connector->kdev.parent = &dev->primary->kdev;
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connector->kdev.class = drm_class;
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connector->kdev.release = drm_sysfs_device_release;
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DRM_DEBUG("adding \"%s\" to sysfs\n",
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drm_get_connector_name(connector));
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dev_set_name(&connector->kdev, "card%d-%s",
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dev->primary->index, drm_get_connector_name(connector));
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ret = device_register(&connector->kdev);
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DRM_ERROR("failed to register connector device: %d\n", ret);
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/* Standard attributes */
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for (attr_cnt = 0; attr_cnt < ARRAY_SIZE(connector_attrs); attr_cnt++) {
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ret = device_create_file(&connector->kdev, &connector_attrs[attr_cnt]);
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/* Optional attributes */
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* In the long run it maybe a good idea to make one set of
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* optionals per connector type.
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switch (connector->connector_type) {
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case DRM_MODE_CONNECTOR_DVII:
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case DRM_MODE_CONNECTOR_Composite:
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case DRM_MODE_CONNECTOR_SVIDEO:
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case DRM_MODE_CONNECTOR_Component:
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case DRM_MODE_CONNECTOR_TV:
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for (opt_cnt = 0; opt_cnt < ARRAY_SIZE(connector_attrs_opt1); opt_cnt++) {
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ret = device_create_file(&connector->kdev, &connector_attrs_opt1[opt_cnt]);
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ret = sysfs_create_bin_file(&connector->kdev.kobj, &edid_attr);
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/* Let userspace know we have a new connector */
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drm_sysfs_hotplug_event(dev);
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for (i = 0; i < opt_cnt; i++)
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device_remove_file(&connector->kdev, &connector_attrs_opt1[i]);
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for (i = 0; i < attr_cnt; i++)
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device_remove_file(&connector->kdev, &connector_attrs[i]);
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device_unregister(&connector->kdev);
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EXPORT_SYMBOL(drm_sysfs_connector_add);
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* drm_sysfs_connector_remove - remove an connector device from sysfs
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* @connector: connector to remove
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* Remove @connector and its associated attributes from sysfs. Note that
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* the device model core will take care of sending the "remove" uevent
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* at this time, so we don't need to do it.
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* This routine should only be called if the connector was previously
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* successfully registered. If @connector hasn't been registered yet,
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* you'll likely see a panic somewhere deep in sysfs code when called.
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void drm_sysfs_connector_remove(struct drm_connector *connector)
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DRM_DEBUG("removing \"%s\" from sysfs\n",
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drm_get_connector_name(connector));
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for (i = 0; i < ARRAY_SIZE(connector_attrs); i++)
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device_remove_file(&connector->kdev, &connector_attrs[i]);
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sysfs_remove_bin_file(&connector->kdev.kobj, &edid_attr);
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device_unregister(&connector->kdev);
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EXPORT_SYMBOL(drm_sysfs_connector_remove);
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* drm_sysfs_hotplug_event - generate a DRM uevent
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* Send a uevent for the DRM device specified by @dev. Currently we only
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* set HOTPLUG=1 in the uevent environment, but this could be expanded to
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* deal with other types of events.
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void drm_sysfs_hotplug_event(struct drm_device *dev)
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char *event_string = "HOTPLUG=1";
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char *envp[] = { event_string, NULL };
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DRM_DEBUG("generating hotplug event\n");
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kobject_uevent_env(&dev->primary->kdev.kobj, KOBJ_CHANGE, envp);
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EXPORT_SYMBOL(drm_sysfs_hotplug_event);
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* drm_sysfs_device_add - adds a class device to sysfs for a character driver
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* @dev: DRM device to be added
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* @head: DRM head in question
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* Add a DRM device to the DRM's device model class. We use @dev's PCI device
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* as the parent for the Linux device, and make sure it has a file containing
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* the driver we're using (for userspace compatibility).
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int drm_sysfs_device_add(struct drm_minor *minor)
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minor->kdev.parent = minor->dev->dev;
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minor->kdev.class = drm_class;
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minor->kdev.release = drm_sysfs_device_release;
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minor->kdev.devt = minor->device;
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minor->kdev.type = &drm_sysfs_device_minor;
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if (minor->type == DRM_MINOR_CONTROL)
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minor_str = "controlD%d";
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else if (minor->type == DRM_MINOR_RENDER)
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minor_str = "renderD%d";
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minor_str = "card%d";
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dev_set_name(&minor->kdev, minor_str, minor->index);
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err = device_register(&minor->kdev);
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DRM_ERROR("device add failed: %d\n", err);
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* drm_sysfs_device_remove - remove DRM device
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* @dev: DRM device to remove
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* This call unregisters and cleans up a class device that was created with a
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* call to drm_sysfs_device_add()
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void drm_sysfs_device_remove(struct drm_minor *minor)
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device_unregister(&minor->kdev);
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* drm_class_device_register - Register a struct device in the drm class.
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* @dev: pointer to struct device to register.
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* @dev should have all relevant members pre-filled with the exception
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* of the class member. In particular, the device_type member must
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int drm_class_device_register(struct device *dev)
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dev->class = drm_class;
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return device_register(dev);
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EXPORT_SYMBOL_GPL(drm_class_device_register);
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void drm_class_device_unregister(struct device *dev)
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return device_unregister(dev);
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EXPORT_SYMBOL_GPL(drm_class_device_unregister);