1 // SPDX-License-Identifier: GPL-2.0
10 #include <linux/device.h>
30 static char *accel_devnode(const struct device *dev, umode_t *mode)  in accel_devnode()
41 	accel_class->devnode = accel_devnode;  in accel_sysfs_init()
56 	struct drm_info_node *node = (struct drm_info_node *) m->private;  in accel_name_info()
57 	struct drm_minor *minor = node->minor;  in accel_name_info()
58 	struct drm_device *dev = minor->dev;  in accel_name_info()
61 	mutex_lock(&dev->master_mutex);  in accel_name_info()
62 	master = dev->master;  in accel_name_info()
63 	seq_printf(m, "%s", dev->driver->name);  in accel_name_info()
64 	if (dev->dev)  in accel_name_info()
65 		seq_printf(m, " dev=%s", dev_name(dev->dev));  in accel_name_info()
66 	if (master && master->unique)  in accel_name_info()
67 		seq_printf(m, " master=%s", master->unique);  in accel_name_info()
68 	if (dev->unique)  in accel_name_info()
69 		seq_printf(m, " unique=%s", dev->unique);  in accel_name_info()
71 	mutex_unlock(&dev->master_mutex);  in accel_name_info()
82  * accel_debugfs_init() - Initialize debugfs for accel minor
92 	struct drm_device *dev = minor->dev;  in accel_debugfs_init()
95 	INIT_LIST_HEAD(&minor->debugfs_list);  in accel_debugfs_init()
96 	mutex_init(&minor->debugfs_lock);  in accel_debugfs_init()
98 	minor->debugfs_root = debugfs_create_dir(name, accel_debugfs_root);  in accel_debugfs_init()
101 				 minor->debugfs_root, minor);  in accel_debugfs_init()
103 	if (dev->driver->debugfs_init)  in accel_debugfs_init()
104 		dev->driver->debugfs_init(minor);  in accel_debugfs_init()
108  * accel_set_device_instance_params() - Set some device parameters for accel device
109  * @kdev: Pointer to the device instance.
112  * This function creates the dev_t of the device using the accel major and
113  * the device's minor number. In addition, it sets the class and type of the
114  * device instance to the accel sysfs class and device type, respectively.
116 void accel_set_device_instance_params(struct device *kdev, int index)  in accel_set_device_instance_params()
118 	kdev->devt = MKDEV(ACCEL_MAJOR, index);  in accel_set_device_instance_params()
119 	kdev->class = accel_class;  in accel_set_device_instance_params()
120 	kdev->type = &accel_sysfs_device_minor;  in accel_set_device_instance_params()
124  * accel_minor_alloc() - Allocates a new accel minor
144  * accel_minor_remove() - Remove an accel minor
160  * accel_minor_replace() - Replace minor pointer in accel minors idr.
180  * Looks up the given minor-ID and returns the respective DRM-minor object. The
181  * refence-count of the underlying device is increased so you must release this
184  * The object can be only a drm_minor that represents an accel device.
187  * minor->dev pointer will stay valid! However, the device may get unplugged and
198 		drm_dev_get(minor->dev);  in accel_minor_acquire()
202 		return ERR_PTR(-ENODEV);  in accel_minor_acquire()
203 	} else if (drm_dev_is_unplugged(minor->dev)) {  in accel_minor_acquire()
204 		drm_dev_put(minor->dev);  in accel_minor_acquire()
205 		return ERR_PTR(-ENODEV);  in accel_minor_acquire()
213 	drm_dev_put(minor->dev);  in accel_minor_release()
217  * accel_open - open method for ACCEL file
218  * @inode: device inode
222  * It looks up the correct ACCEL device and instantiates all the per-file
237 	dev = minor->dev;  in accel_open()
239 	atomic_fetch_inc(&dev->open_count);  in accel_open()
241 	/* share address_space across all char-devs of a single device */  in accel_open()
242 	filp->f_mapping = dev->anon_inode->i_mapping;  in accel_open()
251 	atomic_dec(&dev->open_count);  in accel_open()
267 	new_fops = fops_get(minor->dev->driver->fops);  in accel_stub_open()
269 		err = -ENODEV;  in accel_stub_open()
274 	if (filp->f_op->open)  in accel_stub_open()
275 		err = filp->f_op->open(inode, filp);  in accel_stub_open()