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()
52 	struct drm_info_node *node = (struct drm_info_node *) m->private;  in accel_name_info()
53 	struct drm_minor *minor = node->minor;  in accel_name_info()
54 	struct drm_device *dev = minor->dev;  in accel_name_info()
57 	mutex_lock(&dev->master_mutex);  in accel_name_info()
58 	master = dev->master;  in accel_name_info()
59 	seq_printf(m, "%s", dev->driver->name);  in accel_name_info()
60 	if (dev->dev)  in accel_name_info()
61 		seq_printf(m, " dev=%s", dev_name(dev->dev));  in accel_name_info()
62 	if (master && master->unique)  in accel_name_info()
63 		seq_printf(m, " master=%s", master->unique);  in accel_name_info()
64 	if (dev->unique)  in accel_name_info()
65 		seq_printf(m, " unique=%s", dev->unique);  in accel_name_info()
67 	mutex_unlock(&dev->master_mutex);  in accel_name_info()
78  * accel_debugfs_init() - Initialize debugfs for device
79  * @dev: Pointer to the device instance.
81  * This function creates a root directory for the device in debugfs.
89  * accel_debugfs_register() - Register debugfs for device
90  * @dev: Pointer to the device instance.
96 	struct drm_minor *minor = dev->accel;  in accel_debugfs_register()
98 	minor->debugfs_root = dev->debugfs_root;  in accel_debugfs_register()
101 				 dev->debugfs_root, minor);  in accel_debugfs_register()
105  * accel_set_device_instance_params() - Set some device parameters for accel device
106  * @kdev: Pointer to the device instance.
109  * This function creates the dev_t of the device using the accel major and
110  * the device's minor number. In addition, it sets the class and type of the
111  * device instance to the accel sysfs class and device type, respectively.
113 void accel_set_device_instance_params(struct device *kdev, int index)  in accel_set_device_instance_params()
115 	kdev->devt = MKDEV(ACCEL_MAJOR, index);  in accel_set_device_instance_params()
116 	kdev->class = &accel_class;  in accel_set_device_instance_params()
117 	kdev->type = &accel_sysfs_device_minor;  in accel_set_device_instance_params()
121  * accel_minor_alloc() - Allocates a new accel minor
141  * accel_minor_remove() - Remove an accel minor
157  * accel_minor_replace() - Replace minor pointer in accel minors idr.
177  * Looks up the given minor-ID and returns the respective DRM-minor object. The
178  * refence-count of the underlying device is increased so you must release this
181  * The object can be only a drm_minor that represents an accel device.
184  * minor->dev pointer will stay valid! However, the device may get unplugged and
195 		drm_dev_get(minor->dev);  in accel_minor_acquire()
199 		return ERR_PTR(-ENODEV);  in accel_minor_acquire()
200 	} else if (drm_dev_is_unplugged(minor->dev)) {  in accel_minor_acquire()
201 		drm_dev_put(minor->dev);  in accel_minor_acquire()
202 		return ERR_PTR(-ENODEV);  in accel_minor_acquire()
210 	drm_dev_put(minor->dev);  in accel_minor_release()
214  * accel_open - open method for ACCEL file
215  * @inode: device inode
219  * It looks up the correct ACCEL device and instantiates all the per-file
234 	dev = minor->dev;  in accel_open()
236 	atomic_fetch_inc(&dev->open_count);  in accel_open()
238 	/* share address_space across all char-devs of a single device */  in accel_open()
239 	filp->f_mapping = dev->anon_inode->i_mapping;  in accel_open()
248 	atomic_dec(&dev->open_count);  in accel_open()
264 	new_fops = fops_get(minor->dev->driver->fops);  in accel_stub_open()
266 		err = -ENODEV;  in accel_stub_open()
271 	if (filp->f_op->open)  in accel_stub_open()
272 		err = filp->f_op->open(inode, filp);  in accel_stub_open()