C++ platform_device_unregister函数代码示例

/*
=====================rsz_init===========================
function to	register resizer character driver
*/
static __init int rsz_init(void)
{

	int result;

	/* Register     the     driver in the kernel */

	result = alloc_chrdev_region(&dev, 0, 1, DRIVER_NAME);
	if (result < 0) {
		printk(KERN_ERR
		       "DaVinciresizer: could not register character device");
		return -ENODEV;
	}
	/* Initialize of character device */
	cdev_init(&c_dev, &rsz_fops);
	c_dev.owner = THIS_MODULE;
	c_dev.ops = &rsz_fops;

	/* addding character device */
	result = cdev_add(&c_dev, dev, 1);

	if (result) {
		printk(KERN_ERR
		       "DaVinciresizer:Error %d adding"
			" Davinciresizer ..error no:",
		       result);
		unregister_chrdev_region(dev, 1);
		return result;
	}

	/* registeration of     character device */
	register_chrdev(MAJOR(dev), DRIVER_NAME, &rsz_fops);

	/* register driver as a platform driver */
	if (driver_register(&resizer_driver) != 0) {
		unregister_chrdev_region(dev, 1);
		cdev_del(&c_dev);
		return -EINVAL;
	}

	/* Register the drive as a platform device */
	if (platform_device_register(&resizer_device) != 0) {
		driver_unregister(&resizer_driver);
		unregister_chrdev_region(dev, 1);
		unregister_chrdev(MAJOR(dev), DRIVER_NAME);
		cdev_del(&c_dev);
		return -EINVAL;
	}

	rsz_class = class_create(THIS_MODULE, "davinci_resizer");

	if (!rsz_class) {

		platform_device_unregister(&resizer_device);
		cdev_del(&c_dev);
		unregister_chrdev(MAJOR(dev), DRIVER_NAME);

		return -EIO;
	}

	device_create(rsz_class, NULL, dev, NULL, "davinci_resizer");

	rsz_dev.users = 0;

	mutex_init(&rsz_dev.lock);
	/* Initialize the serializer */
	imp_init_serializer();
	imp_hw_if = imp_get_hw_if();
	printk(KERN_NOTICE "davinci_resizer initialized\n");
	return 0;
}				/* End   of function  resizer_init */

static void __exit kylew_modexit(void)
{
	platform_device_unregister(kylew_snd_device);
}

static void __exit msm_audio_exit(void)
{
	msm8660_wm8903_unprepare();
	platform_device_unregister(msm_snd_device);
}

static void __exit sc881x_modexit(void)
{
	platform_device_unregister(sc881x_snd_device);
}

static void __exit imx_phycore_exit(void)
{
	platform_device_unregister(imx_phycore_snd_device);
	platform_device_unregister(imx_phycore_snd_ac97_device);
}

static void __exit rx1950_exit(void)
{
	platform_device_unregister(s3c24xx_snd_device);
	gpio_free(S3C2410_GPA(1));
}

//.........这里部分代码省略.........
		return -ENOMEM;
	}
	dev->pdev = platform_device_alloc(ctrl_bridge_names[id], id);
	if (!dev->pdev) {
		dev_err(&ifc->dev, "%s: unable to allocate platform device\n",
			__func__);
		retval = -ENOMEM;
		goto nomem;
	}

	dev->udev = udev;
	dev->int_pipe = usb_rcvintpipe(udev,
		int_in->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK);
	dev->intf = ifc;

	init_usb_anchor(&dev->tx_submitted);
	init_usb_anchor(&dev->tx_deferred);

	/*use max pkt size from ep desc*/
	ep = &dev->intf->cur_altsetting->endpoint[0].desc;

	dev->inturb = usb_alloc_urb(0, GFP_KERNEL);
	if (!dev->inturb) {
		dev_err(&ifc->dev, "%s: error allocating int urb\n", __func__);
		retval = -ENOMEM;
		goto pdev_del;
	}

	wMaxPacketSize = le16_to_cpu(ep->wMaxPacketSize);

	dev->intbuf = kmalloc(wMaxPacketSize, GFP_KERNEL);
	if (!dev->intbuf) {
		dev_err(&ifc->dev, "%s: error allocating int buffer\n",
			__func__);
		retval = -ENOMEM;
		goto free_inturb;
	}

	interval =
		(udev->speed == USB_SPEED_HIGH) ? HS_INTERVAL : FS_LS_INTERVAL;

	usb_fill_int_urb(dev->inturb, udev, dev->int_pipe,
				dev->intbuf, wMaxPacketSize,
				notification_available_cb, dev, interval);

	dev->readurb = usb_alloc_urb(0, GFP_KERNEL);
	if (!dev->readurb) {
		dev_err(&ifc->dev, "%s: error allocating read urb\n",
			__func__);
		retval = -ENOMEM;
		goto free_intbuf;
	}

	dev->readbuf = kmalloc(DEFAULT_READ_URB_LENGTH, GFP_KERNEL);
	if (!dev->readbuf) {
		dev_err(&ifc->dev, "%s: error allocating read buffer\n",
			__func__);
		retval = -ENOMEM;
		goto free_rurb;
	}

	dev->in_ctlreq = kmalloc(sizeof(*dev->in_ctlreq), GFP_KERNEL);
	if (!dev->in_ctlreq) {
		dev_err(&ifc->dev, "%s:error allocating setup packet buffer\n",
			__func__);
		retval = -ENOMEM;
		goto free_rbuf;
	}

	dev->in_ctlreq->bRequestType =
			(USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE);
	dev->in_ctlreq->bRequest  = USB_CDC_GET_ENCAPSULATED_RESPONSE;
	dev->in_ctlreq->wValue = 0;
	dev->in_ctlreq->wIndex =
		dev->intf->cur_altsetting->desc.bInterfaceNumber;
	dev->in_ctlreq->wLength = cpu_to_le16(DEFAULT_READ_URB_LENGTH);

	__dev[id] = dev;

	platform_device_add(dev->pdev);

	ch_id++;

	return ctrl_bridge_start_read(dev);

free_rbuf:
	kfree(dev->readbuf);
free_rurb:
	usb_free_urb(dev->readurb);
free_intbuf:
	kfree(dev->intbuf);
free_inturb:
	usb_free_urb(dev->inturb);
pdev_del:
	platform_device_unregister(dev->pdev);
nomem:
	kfree(dev);

	return retval;
}

static void __exit tc1100_exit(void)
{
	platform_device_unregister(tc1100_device);
	platform_driver_unregister(&tc1100_driver);
}

static void lirc_dove_exit(void)
{
	platform_device_unregister(lirc_dove_dev);
	platform_driver_unregister(&lirc_dove_driver);
	lirc_buffer_free(&rbuf);
}

static void __exit omap3pandora_soc_exit(void)
{
    platform_device_unregister(omap3pandora_snd_device);
    gpio_free(OMAP3_PANDORA_AMP_POWER_GPIO);
    gpio_free(OMAP3_PANDORA_DAC_POWER_GPIO);
}

static int __init hdaps_init(void)
{
	int ret;

	/* Determine axis orientation orientation */
	if (hdaps_invert == HDAPS_ORIENT_UNDEFINED) /* set by module param? */
		if (dmi_check_system(hdaps_whitelist) < 1) /* in whitelist? */
			hdaps_invert = 0; /* default */

	/* Init timer before platform_driver_register, in case of suspend */
#if LINUX_VERSION_CODE < KERNEL_VERSION(4,15,0)
	init_timer(&hdaps_timer);
	hdaps_timer.function = hdaps_mousedev_poll;
#else
	timer_setup(&hdaps_timer, hdaps_mousedev_poll, 0);
#endif
	ret = platform_driver_register(&hdaps_driver);
	if (ret)
		goto out;

	pdev = platform_device_register_simple("hdaps", -1, NULL, 0);
	if (IS_ERR(pdev)) {
		ret = PTR_ERR(pdev);
		goto out_driver;
	}

	ret = sysfs_create_group(&pdev->dev.kobj, &hdaps_attribute_group);
	if (ret)
		goto out_device;

	hdaps_idev = input_allocate_device();
	if (!hdaps_idev) {
		ret = -ENOMEM;
		goto out_group;
	}

	hdaps_idev_raw = input_allocate_device();
	if (!hdaps_idev_raw) {
		ret = -ENOMEM;
		goto out_idev_first;
	}

	/* calibration for the input device (deferred to avoid delay) */
	needs_calibration = 1;

	/* initialize the joystick-like fuzzed input device */
	hdaps_idev->name = "ThinkPad HDAPS joystick emulation";
	hdaps_idev->phys = "hdaps/input0";
	hdaps_idev->id.bustype = BUS_HOST;
	hdaps_idev->id.vendor  = HDAPS_INPUT_VENDOR;
	hdaps_idev->id.product = HDAPS_INPUT_PRODUCT;
	hdaps_idev->id.version = HDAPS_INPUT_JS_VERSION;
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,25)
	hdaps_idev->cdev.dev = &pdev->dev;
#endif
	hdaps_idev->evbit[0] = BIT(EV_ABS);
	hdaps_idev->open = hdaps_mousedev_open;
	hdaps_idev->close = hdaps_mousedev_close;
	input_set_abs_params(hdaps_idev, ABS_X,
			-256, 256, HDAPS_INPUT_FUZZ, HDAPS_INPUT_FLAT);
	input_set_abs_params(hdaps_idev, ABS_Y,
			-256, 256, HDAPS_INPUT_FUZZ, HDAPS_INPUT_FLAT);

	ret = input_register_device(hdaps_idev);
	if (ret)
		goto out_idev;

	/* initialize the raw data input device */
	hdaps_idev_raw->name = "ThinkPad HDAPS accelerometer data";
	hdaps_idev_raw->phys = "hdaps/input1";
	hdaps_idev_raw->id.bustype = BUS_HOST;
	hdaps_idev_raw->id.vendor  = HDAPS_INPUT_VENDOR;
	hdaps_idev_raw->id.product = HDAPS_INPUT_PRODUCT;
	hdaps_idev_raw->id.version = HDAPS_INPUT_RAW_VERSION;
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,25)
	hdaps_idev_raw->cdev.dev = &pdev->dev;
#endif
	hdaps_idev_raw->evbit[0] = BIT(EV_ABS);
	hdaps_idev_raw->open = hdaps_mousedev_open;
	hdaps_idev_raw->close = hdaps_mousedev_close;
	input_set_abs_params(hdaps_idev_raw, ABS_X, -32768, 32767, 0, 0);
	input_set_abs_params(hdaps_idev_raw, ABS_Y, -32768, 32767, 0, 0);

	ret = input_register_device(hdaps_idev_raw);
	if (ret)
		goto out_idev_reg_first;

	printk(KERN_INFO "hdaps: driver successfully loaded.\n");
	return 0;

out_idev_reg_first:
	input_unregister_device(hdaps_idev);
out_idev:
	input_free_device(hdaps_idev_raw);
out_idev_first:
	input_free_device(hdaps_idev);
out_group:
	sysfs_remove_group(&pdev->dev.kobj, &hdaps_attribute_group);
out_device:
	platform_device_unregister(pdev);
//.........这里部分代码省略.........

static void __exit q40kbd_exit(void)
{
	serio_unregister_port(q40kbd_port);
	platform_device_unregister(q40kbd_device);
}

static int __devinit
bridge_probe(struct usb_interface *iface, const struct usb_device_id *id)
{
	struct usb_host_endpoint	*endpoint = NULL;
	struct usb_host_endpoint	*bulk_in = NULL;
	struct usb_host_endpoint	*bulk_out = NULL;
	struct usb_host_endpoint	*int_in = NULL;
	struct usb_device		*udev;
	int				i;
	int				status = 0;
	int				numends;
	int				ch_id;
	char				**bname = (char **)id->driver_info;

	if (iface->num_altsetting != 1) {
		err("%s invalid num_altsetting %u\n",
				__func__, iface->num_altsetting);
		return -EINVAL;
	}

	udev = interface_to_usbdev(iface);
	usb_get_dev(udev);

	numends = iface->cur_altsetting->desc.bNumEndpoints;
	for (i = 0; i < numends; i++) {
		endpoint = iface->cur_altsetting->endpoint + i;
		if (!endpoint) {
			dev_err(&iface->dev, "%s: invalid endpoint %u\n",
					__func__, i);
			status = -EINVAL;
			goto out;
		}

		if (usb_endpoint_is_bulk_in(&endpoint->desc))
			bulk_in = endpoint;
		else if (usb_endpoint_is_bulk_out(&endpoint->desc))
			bulk_out = endpoint;
		else if (usb_endpoint_is_int_in(&endpoint->desc))
			int_in = endpoint;
	}

	if (!bulk_in || !bulk_out || !int_in) {
		dev_err(&iface->dev, "%s: invalid endpoints\n", __func__);
		status = -EINVAL;
		goto out;
	}

	ch_id = get_bridge_dev_idx();
	if (ch_id < 0) {
		err("%s all bridge channels claimed. Probe failed\n", __func__);
		return -ENODEV;
	}

	status = data_bridge_probe(iface, bulk_in, bulk_out,
			bname[BRIDGE_DATA_IDX], ch_id);
	if (status < 0) {
		dev_err(&iface->dev, "data_bridge_probe failed %d\n", status);
		goto out;
	}

	status = ctrl_bridge_probe(iface, int_in, bname[BRIDGE_CTRL_IDX],
			ch_id);
	if (status < 0) {
		dev_err(&iface->dev, "ctrl_bridge_probe failed %d\n", status);
		goto error;
	}

	return 0;

error:
	platform_device_unregister(__dev[ch_id]->pdev);
	free_rx_urbs(__dev[ch_id]);
	usb_set_intfdata(iface, NULL);
out:
	usb_put_dev(udev);

	return status;
}

static __exit void fake_exit(void)
{
	platform_driver_unregister(&ieee802154fake_driver);
	platform_device_unregister(ieee802154fake_dev);
}

static void __exit imx_3stack_asoc_exit(void)
{
	platform_driver_unregister(&imx_3stack_cs42888_driver);
	platform_device_unregister(imx_3stack_snd_device);
}