/* * 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 * Copyright (c) 2003-2004 Greg Kroah-Hartman * Copyright (c) 2003-2004 IBM Corp. * * This file is released under the GPLv2 * */ #include #include #include #include #include #include #include #include #include "drm_internal.h" #define to_drm_minor(d) dev_get_drvdata(d) #define to_drm_connector(d) dev_get_drvdata(d) static struct device_type drm_sysfs_device_minor = { .name = "drm_minor" }; /** * __drm_class_suspend - internal DRM class suspend routine * @dev: Linux device to suspend * @state: power state to enter * * Just figures out what the actual struct drm_device associated with * @dev is and calls its suspend hook, if present. */ static int __drm_class_suspend(struct device *dev, pm_message_t state) { if (dev->type == &drm_sysfs_device_minor) { struct drm_minor *drm_minor = to_drm_minor(dev); struct drm_device *drm_dev = drm_minor->dev; if (drm_minor->type == DRM_MINOR_LEGACY && !drm_core_check_feature(drm_dev, DRIVER_MODESET) && drm_dev->driver->suspend) return drm_dev->driver->suspend(drm_dev, state); } return 0; } /** * drm_class_suspend - internal DRM class suspend hook. Simply calls * __drm_class_suspend() with the correct pm state. * @dev: Linux device to suspend */ static int drm_class_suspend(struct device *dev) { return __drm_class_suspend(dev, PMSG_SUSPEND); } /** * drm_class_freeze - internal DRM class freeze hook. Simply calls * __drm_class_suspend() with the correct pm state. * @dev: Linux device to freeze */ static int drm_class_freeze(struct device *dev) { return __drm_class_suspend(dev, PMSG_FREEZE); } /** * drm_class_resume - DRM class resume hook * @dev: Linux device to resume * * Just figures out what the actual struct drm_device associated with * @dev is and calls its resume hook, if present. */ static int drm_class_resume(struct device *dev) { if (dev->type == &drm_sysfs_device_minor) { struct drm_minor *drm_minor = to_drm_minor(dev); struct drm_device *drm_dev = drm_minor->dev; if (drm_minor->type == DRM_MINOR_LEGACY && !drm_core_check_feature(drm_dev, DRIVER_MODESET) && drm_dev->driver->resume) return drm_dev->driver->resume(drm_dev); } return 0; } static const struct dev_pm_ops drm_class_dev_pm_ops = { .suspend = drm_class_suspend, .resume = drm_class_resume, .freeze = drm_class_freeze, }; 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, CORE_NAME " " __stringify(CORE_MAJOR) "." __stringify(CORE_MINOR) "." __stringify(CORE_PATCHLEVEL) " " CORE_DATE); /** * drm_sysfs_create - create a struct drm_sysfs_class structure * @owner: pointer to the module that is to "own" this struct drm_sysfs_class * @name: pointer to a string for the name of this class. * * This is used to create DRM class pointer that can then be used * in calls to drm_sysfs_device_add(). * * Note, the pointer created here is to be destroyed when finished by making a * call to drm_sysfs_destroy(). */ struct class *drm_sysfs_create(struct module *owner, char *name) { struct class *class; int err; class = class_create(owner, name); if (IS_ERR(class)) { err = PTR_ERR(class); goto err_out; } class->pm = &drm_class_dev_pm_ops; err = class_create_file(class, &class_attr_version.attr); if (err) goto err_out_class; class->devnode = drm_devnode; return class; err_out_class: class_destroy(class); err_out: return ERR_PTR(err); } /** * drm_sysfs_destroy - destroys DRM class * * Destroy the DRM device class. */ void drm_sysfs_destroy(void) { if ((drm_class == NULL) || (IS_ERR(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_status old_status; int ret; ret = mutex_lock_interruptible(&dev->mode_config.mutex); if (ret) return ret; old_status = connector->status; if (sysfs_streq(buf, "detect")) { connector->force = 0; connector->status = connector->funcs->detect(connector, true); } 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 (ret == 0 && connector->force) { if (connector->force == DRM_FORCE_ON || connector->force == DRM_FORCE_ON_DIGITAL) connector->status = connector_status_connected; else connector->status = connector_status_disconnected; if (connector->funcs->force) connector->funcs->force(connector); } if (old_status != connector->status) { DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %d to %d\n", connector->base.id, connector->name, old_status, connector->status); dev->mode_config.delayed_event = true; if (dev->mode_config.poll_enabled) schedule_delayed_work(&dev->mode_config.output_poll_work, 0); } 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); return snprintf(buf, PAGE_SIZE, "%s\n", drm_get_connector_status_name(connector->status)); } static ssize_t dpms_show(struct device *device, struct device_attribute *attr, char *buf) { struct drm_connector *connector = to_drm_connector(device); struct drm_device *dev = connector->dev; uint64_t dpms_status; int ret; ret = drm_object_property_get_value(&connector->base, dev->mode_config.dpms_property, &dpms_status); if (ret) return 0; return snprintf(buf, PAGE_SIZE, "%s\n", drm_get_dpms_name((int)dpms_status)); } static ssize_t enabled_show(struct device *device, struct device_attribute *attr, char *buf) { struct drm_connector *connector = to_drm_connector(device); return snprintf(buf, PAGE_SIZE, "%s\n", connector->encoder ? "enabled" : "disabled"); } 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 = container_of(kobj, struct device, kobj); struct drm_connector *connector = to_drm_connector(connector_dev); unsigned char *edid; size_t size; if (!connector->edid_blob_ptr) return 0; edid = connector->edid_blob_ptr->data; size = connector->edid_blob_ptr->length; if (!edid) return 0; if (off >= size) return 0; if (off + count > size) count = size - off; memcpy(buf, edid + off, count); return count; } 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; list_for_each_entry(mode, &connector->modes, head) { written += snprintf(buf + written, PAGE_SIZE - written, "%s\n", mode->name); } return written; } static ssize_t tv_subconnector_show(struct device *device, struct device_attribute *attr, char *buf) { struct drm_connector *connector = to_drm_connector(device); struct drm_device *dev = connector->dev; struct drm_property *prop; uint64_t subconnector; int ret; prop = dev->mode_config.tv_subconnector_property; if (!prop) { DRM_ERROR("Unable to find subconnector property\n"); return 0; } ret = drm_object_property_get_value(&connector->base, prop, &subconnector); if (ret) return 0; return snprintf(buf, PAGE_SIZE, "%s", drm_get_tv_subconnector_name((int)subconnector)); } static ssize_t tv_select_subconnector_show(struct device *device, struct device_attribute *attr, char *buf) { struct drm_connector *connector = to_drm_connector(device); struct drm_device *dev = connector->dev; struct drm_property *prop; uint64_t subconnector; int ret; prop = dev->mode_config.tv_select_subconnector_property; if (!prop) { DRM_ERROR("Unable to find select subconnector property\n"); return 0; } ret = drm_object_property_get_value(&connector->base, prop, &subconnector); if (ret) return 0; return snprintf(buf, PAGE_SIZE, "%s", drm_get_tv_select_name((int)subconnector)); } static ssize_t dvii_subconnector_show(struct device *device, struct device_attribute *attr, char *buf) { struct drm_connector *connector = to_drm_connector(device); struct drm_device *dev = connector->dev; struct drm_property *prop; uint64_t subconnector; int ret; prop = dev->mode_config.dvi_i_subconnector_property; if (!prop) { DRM_ERROR("Unable to find subconnector property\n"); return 0; } ret = drm_object_property_get_value(&connector->base, prop, &subconnector); if (ret) return 0; return snprintf(buf, PAGE_SIZE, "%s", drm_get_dvi_i_subconnector_name((int)subconnector)); } static ssize_t dvii_select_subconnector_show(struct device *device, struct device_attribute *attr, char *buf) { struct drm_connector *connector = to_drm_connector(device); struct drm_device *dev = connector->dev; struct drm_property *prop; uint64_t subconnector; int ret; prop = dev->mode_config.dvi_i_select_subconnector_property; if (!prop) { DRM_ERROR("Unable to find select subconnector property\n"); return 0; } ret = drm_object_property_get_value(&connector->base, prop, &subconnector); if (ret) return 0; return snprintf(buf, PAGE_SIZE, "%s", drm_get_dvi_i_select_name((int)subconnector)); } 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 DEVICE_ATTR_RO(tv_subconnector); static DEVICE_ATTR_RO(tv_select_subconnector); static struct attribute *connector_tv_dev_attrs[] = { &dev_attr_tv_subconnector.attr, &dev_attr_tv_select_subconnector.attr, NULL }; static DEVICE_ATTR_RO(dvii_subconnector); static DEVICE_ATTR_RO(dvii_select_subconnector); static struct attribute *connector_dvii_dev_attrs[] = { &dev_attr_dvii_subconnector.attr, &dev_attr_dvii_select_subconnector.attr, NULL }; /* Connector type related helpers */ static int kobj_connector_type(struct kobject *kobj) { struct device *dev = kobj_to_dev(kobj); struct drm_connector *connector = to_drm_connector(dev); return connector->connector_type; } static umode_t connector_is_dvii(struct kobject *kobj, struct attribute *attr, int idx) { return kobj_connector_type(kobj) == DRM_MODE_CONNECTOR_DVII ? attr->mode : 0; } static umode_t connector_is_tv(struct kobject *kobj, struct attribute *attr, int idx) { switch (kobj_connector_type(kobj)) { case DRM_MODE_CONNECTOR_Composite: case DRM_MODE_CONNECTOR_SVIDEO: case DRM_MODE_CONNECTOR_Component: case DRM_MODE_CONNECTOR_TV: return attr->mode; } return 0; } 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_tv_dev_group = { .attrs = connector_tv_dev_attrs, .is_visible = connector_is_tv, }; static const struct attribute_group connector_dvii_dev_group = { .attrs = connector_dvii_dev_attrs, .is_visible = connector_is_dvii, }; static const struct attribute_group *connector_dev_groups[] = { &connector_dev_group, &connector_tv_dev_group, &connector_dvii_dev_group, NULL }; /** * drm_sysfs_connector_add - add a connector to sysfs * @connector: connector to add * * Create a connector device in sysfs, along with its associated connector * properties (so far, connection status, dpms, mode list & edid) and * generate a hotplug event so userspace knows there's a new connector * available. */ 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; } /** * drm_sysfs_connector_remove - remove an connector device from sysfs * @connector: connector to remove * * Remove @connector and its associated attributes from sysfs. Note that * the device model core will take care of sending the "remove" uevent * at this time, so we don't need to do it. * * Note: * This routine should only be called if the connector was previously * successfully registered. If @connector hasn't been registered yet, * you'll likely see a panic somewhere deep in sysfs code when called. */ 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; } /** * 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); } /** * drm_sysfs_minor_alloc() - Allocate sysfs device for given minor * @minor: minor to allocate sysfs device for * * This allocates a new sysfs device for @minor and returns it. The device is * not registered nor linked. The caller has to use device_add() and * device_del() to register and unregister it. * * Note that dev_get_drvdata() on the new device will return the minor. * However, the device does not hold a ref-count to the minor nor to the * underlying drm_device. This is unproblematic as long as you access the * private data only in sysfs callbacks. device_del() disables those * synchronously, so they cannot be called after you cleanup a minor. */ struct device *drm_sysfs_minor_alloc(struct drm_minor *minor) { const char *minor_str; struct device *kdev; int r; if (minor->type == DRM_MINOR_CONTROL) minor_str = "controlD%d"; else 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 a struct device in the drm class. * * @dev: pointer to struct device to register. * * @dev should have all relevant members pre-filled with the exception * of the class member. In particular, the device_type member must * be set. */ 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); void drm_class_device_unregister(struct device *dev) { return device_unregister(dev); } EXPORT_SYMBOL_GPL(drm_class_device_unregister);