void mei_deregister(struct mei_device *dev) { int devno; devno = dev->cdev.dev; cdev_del(&dev->cdev); mei_dbgfs_deregister(dev); device_destroy(mei_class, devno); mei_minor_free(dev); }
int mei_register(struct mei_device *dev, struct device *parent) { struct device *clsdev; /* class device */ int ret, devno; ret = mei_minor_get(dev); if (ret < 0) return ret; /* Fill in the data structures */ devno = MKDEV(MAJOR(mei_devt), dev->minor); cdev_init(&dev->cdev, &mei_fops); dev->cdev.owner = parent->driver->owner; /* Add the device */ ret = cdev_add(&dev->cdev, devno, 1); if (ret) { dev_err(parent, "unable to add device %d:%d\n", MAJOR(mei_devt), dev->minor); goto err_dev_add; } clsdev = device_create_with_groups(mei_class, parent, devno, dev, mei_groups, "mei%d", dev->minor); if (IS_ERR(clsdev)) { dev_err(parent, "unable to create device %d:%d\n", MAJOR(mei_devt), dev->minor); ret = PTR_ERR(clsdev); goto err_dev_create; } ret = mei_dbgfs_register(dev, dev_name(clsdev)); if (ret) { dev_err(clsdev, "cannot register debugfs ret = %d\n", ret); goto err_dev_dbgfs; } return 0; err_dev_dbgfs: device_destroy(mei_class, devno); err_dev_create: cdev_del(&dev->cdev); err_dev_add: mei_minor_free(dev); return ret; }