[linux-block.git] / drivers / usb / misc / appledisplay.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Apple Cinema Display driver
 *
 * Copyright (C) 2006  Michael Hanselmann (linux-kernel@hansmi.ch)
 *
 * Thanks to Caskey L. Dickson for his work with acdctl.
 */

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <linux/backlight.h>
#include <linux/timer.h>
#include <linux/workqueue.h>
#include <linux/atomic.h>

#define APPLE_VENDOR_ID		0x05AC

#define USB_REQ_GET_REPORT	0x01
#define USB_REQ_SET_REPORT	0x09

#define ACD_USB_TIMEOUT		250

#define ACD_USB_EDID		0x0302
#define ACD_USB_BRIGHTNESS	0x0310

#define ACD_BTN_NONE		0
#define ACD_BTN_BRIGHT_UP	3
#define ACD_BTN_BRIGHT_DOWN	4

#define ACD_URB_BUFFER_LEN	2
#define ACD_MSG_BUFFER_LEN	2

#define APPLEDISPLAY_DEVICE(prod)				\
	.match_flags = USB_DEVICE_ID_MATCH_DEVICE |		\
		       USB_DEVICE_ID_MATCH_INT_CLASS |		\
		       USB_DEVICE_ID_MATCH_INT_PROTOCOL,	\
	.idVendor = APPLE_VENDOR_ID,				\
	.idProduct = (prod),					\
	.bInterfaceClass = USB_CLASS_HID,			\
	.bInterfaceProtocol = 0x00

/* table of devices that work with this driver */
static const struct usb_device_id appledisplay_table[] = {
	{ APPLEDISPLAY_DEVICE(0x9218) },
	{ APPLEDISPLAY_DEVICE(0x9219) },
	{ APPLEDISPLAY_DEVICE(0x921c) },
	{ APPLEDISPLAY_DEVICE(0x921d) },
	{ APPLEDISPLAY_DEVICE(0x9222) },
	{ APPLEDISPLAY_DEVICE(0x9226) },
	{ APPLEDISPLAY_DEVICE(0x9236) },

	/* Terminating entry */
	{ }
};
MODULE_DEVICE_TABLE(usb, appledisplay_table);

/* Structure to hold all of our device specific stuff */
struct appledisplay {
	struct usb_device *udev;	/* usb device */
	struct urb *urb;		/* usb request block */
	struct backlight_device *bd;	/* backlight device */
	u8 *urbdata;			/* interrupt URB data buffer */
	u8 *msgdata;			/* control message data buffer */

	struct delayed_work work;
	int button_pressed;
	struct mutex sysfslock;		/* concurrent read and write */
};

static atomic_t count_displays = ATOMIC_INIT(0);

static void appledisplay_complete(struct urb *urb)
{
	struct appledisplay *pdata = urb->context;
	struct device *dev = &pdata->udev->dev;
	int status = urb->status;
	int retval;

	switch (status) {
	case 0:
		/* success */
		break;
	case -EOVERFLOW:
		dev_err(dev,
			"OVERFLOW with data length %d, actual length is %d\n",
			ACD_URB_BUFFER_LEN, pdata->urb->actual_length);
		fallthrough;
	case -ECONNRESET:
	case -ENOENT:
	case -ESHUTDOWN:
		/* This urb is terminated, clean up */
		dev_dbg(dev, "%s - urb shuttingdown with status: %d\n",
			__func__, status);
		return;
	default:
		dev_dbg(dev, "%s - nonzero urb status received: %d\n",
			__func__, status);
		goto exit;
	}

	switch(pdata->urbdata[1]) {
	case ACD_BTN_BRIGHT_UP:
	case ACD_BTN_BRIGHT_DOWN:
		pdata->button_pressed = 1;
		/*
		 * there is a window during which no device
		 * is registered
		 */
		if (pdata->bd )
			schedule_delayed_work(&pdata->work, 0);
		break;
	case ACD_BTN_NONE:
	default:
		pdata->button_pressed = 0;
		break;
	}

exit:
	retval = usb_submit_urb(pdata->urb, GFP_ATOMIC);
	if (retval) {
		dev_err(dev, "%s - usb_submit_urb failed with result %d\n",
			__func__, retval);
	}
}

static int appledisplay_bl_update_status(struct backlight_device *bd)
{
	struct appledisplay *pdata = bl_get_data(bd);
	int retval;

	mutex_lock(&pdata->sysfslock);
	pdata->msgdata[0] = 0x10;
	pdata->msgdata[1] = bd->props.brightness;

	retval = usb_control_msg(
		pdata->udev,
		usb_sndctrlpipe(pdata->udev, 0),
		USB_REQ_SET_REPORT,
		USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
		ACD_USB_BRIGHTNESS,
		0,
		pdata->msgdata, 2,
		ACD_USB_TIMEOUT);
	mutex_unlock(&pdata->sysfslock);

	if (retval < 0)
		return retval;
	else
		return 0;
}

static int appledisplay_bl_get_brightness(struct backlight_device *bd)
{
	struct appledisplay *pdata = bl_get_data(bd);
	int retval, brightness;

	mutex_lock(&pdata->sysfslock);
	retval = usb_control_msg(
		pdata->udev,
		usb_rcvctrlpipe(pdata->udev, 0),
		USB_REQ_GET_REPORT,
		USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
		ACD_USB_BRIGHTNESS,
		0,
		pdata->msgdata, 2,
		ACD_USB_TIMEOUT);
	if (retval < 2) {
		if (retval >= 0)
			retval = -EMSGSIZE;
	} else {
		brightness = pdata->msgdata[1];
	}
	mutex_unlock(&pdata->sysfslock);

	if (retval < 0)
		return retval;
	else
		return brightness;
}

static const struct backlight_ops appledisplay_bl_data = {
	.get_brightness	= appledisplay_bl_get_brightness,
	.update_status	= appledisplay_bl_update_status,
};

static void appledisplay_work(struct work_struct *work)
{
	struct appledisplay *pdata =
		container_of(work, struct appledisplay, work.work);
	int retval;

	retval = appledisplay_bl_get_brightness(pdata->bd);
	if (retval >= 0)
		pdata->bd->props.brightness = retval;

	/* Poll again in about 125ms if there's still a button pressed */
	if (pdata->button_pressed)
		schedule_delayed_work(&pdata->work, HZ / 8);
}

static int appledisplay_probe(struct usb_interface *iface,
	const struct usb_device_id *id)
{
	struct backlight_properties props;
	struct backlight_device *backlight;
	struct appledisplay *pdata;
	struct usb_device *udev = interface_to_usbdev(iface);
	struct usb_endpoint_descriptor *endpoint;
	int int_in_endpointAddr = 0;
	int retval, brightness;
	char bl_name[20];

	/* set up the endpoint information */
	/* use only the first interrupt-in endpoint */
	retval = usb_find_int_in_endpoint(iface->cur_altsetting, &endpoint);
	if (retval) {
		dev_err(&iface->dev, "Could not find int-in endpoint\n");
		return retval;
	}

	int_in_endpointAddr = endpoint->bEndpointAddress;

	/* allocate memory for our device state and initialize it */
	pdata = kzalloc(sizeof(struct appledisplay), GFP_KERNEL);
	if (!pdata) {
		retval = -ENOMEM;
		goto error;
	}

	pdata->udev = udev;

	INIT_DELAYED_WORK(&pdata->work, appledisplay_work);
	mutex_init(&pdata->sysfslock);

	/* Allocate buffer for control messages */
	pdata->msgdata = kmalloc(ACD_MSG_BUFFER_LEN, GFP_KERNEL);
	if (!pdata->msgdata) {
		retval = -ENOMEM;
		goto error;
	}

	/* Allocate interrupt URB */
	pdata->urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!pdata->urb) {
		retval = -ENOMEM;
		goto error;
	}

	/* Allocate buffer for interrupt data */
	pdata->urbdata = usb_alloc_coherent(pdata->udev, ACD_URB_BUFFER_LEN,
		GFP_KERNEL, &pdata->urb->transfer_dma);
	if (!pdata->urbdata) {
		retval = -ENOMEM;
		dev_err(&iface->dev, "Allocating URB buffer failed\n");
		goto error;
	}

	/* Configure interrupt URB */
	usb_fill_int_urb(pdata->urb, udev,
		usb_rcvintpipe(udev, int_in_endpointAddr),
		pdata->urbdata, ACD_URB_BUFFER_LEN, appledisplay_complete,
		pdata, 1);
	pdata->urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
	if (usb_submit_urb(pdata->urb, GFP_KERNEL)) {
		retval = -EIO;
		dev_err(&iface->dev, "Submitting URB failed\n");
		goto error;
	}

	/* Register backlight device */
	snprintf(bl_name, sizeof(bl_name), "appledisplay%d",
		atomic_inc_return(&count_displays) - 1);
	memset(&props, 0, sizeof(struct backlight_properties));
	props.type = BACKLIGHT_RAW;
	props.max_brightness = 0xff;
	backlight = backlight_device_register(bl_name, NULL, pdata,
					      &appledisplay_bl_data, &props);
	if (IS_ERR(backlight)) {
		dev_err(&iface->dev, "Backlight registration failed\n");
		retval = PTR_ERR(backlight);
		goto error;
	}
	pdata->bd = backlight;

	/* Try to get brightness */
	brightness = appledisplay_bl_get_brightness(pdata->bd);

	if (brightness < 0) {
		retval = brightness;
		dev_err(&iface->dev,
			"Error while getting initial brightness: %d\n", retval);
		goto error;
	}

	/* Set brightness in backlight device */
	pdata->bd->props.brightness = brightness;

	/* save our data pointer in the interface device */
	usb_set_intfdata(iface, pdata);

	printk(KERN_INFO "appledisplay: Apple Cinema Display connected\n");

	return 0;

error:
	if (pdata) {
		if (pdata->urb) {
			usb_kill_urb(pdata->urb);
			cancel_delayed_work_sync(&pdata->work);
			usb_free_coherent(pdata->udev, ACD_URB_BUFFER_LEN,
					pdata->urbdata, pdata->urb->transfer_dma);
			usb_free_urb(pdata->urb);
		}
		if (!IS_ERR(pdata->bd))
			backlight_device_unregister(pdata->bd);
		kfree(pdata->msgdata);
	}
	usb_set_intfdata(iface, NULL);
	kfree(pdata);
	return retval;
}

static void appledisplay_disconnect(struct usb_interface *iface)
{
	struct appledisplay *pdata = usb_get_intfdata(iface);

	if (pdata) {
		usb_kill_urb(pdata->urb);
		cancel_delayed_work_sync(&pdata->work);
		backlight_device_unregister(pdata->bd);
		usb_free_coherent(pdata->udev, ACD_URB_BUFFER_LEN,
			pdata->urbdata, pdata->urb->transfer_dma);
		usb_free_urb(pdata->urb);
		kfree(pdata->msgdata);
		kfree(pdata);
	}

	printk(KERN_INFO "appledisplay: Apple Cinema Display disconnected\n");
}

static struct usb_driver appledisplay_driver = {
	.name		= "appledisplay",
	.probe		= appledisplay_probe,
	.disconnect	= appledisplay_disconnect,
	.id_table	= appledisplay_table,
};
module_usb_driver(appledisplay_driver);

MODULE_AUTHOR("Michael Hanselmann");
MODULE_DESCRIPTION("Apple Cinema Display driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
	1	// SPDX-License-Identifier: GPL-2.0+
	2	/*
	3	* Apple Cinema Display driver
	4	*
	5	* Copyright (C) 2006 Michael Hanselmann (linux-kernel@hansmi.ch)
	6	*
	7	* Thanks to Caskey L. Dickson for his work with acdctl.
	8	*/
	9
	10	#include <linux/kernel.h>
	11	#include <linux/errno.h>
	12	#include <linux/init.h>
	13	#include <linux/module.h>
	14	#include <linux/slab.h>
	15	#include <linux/usb.h>
	16	#include <linux/backlight.h>
	17	#include <linux/timer.h>
	18	#include <linux/workqueue.h>
	19	#include <linux/atomic.h>
	20
	21	#define APPLE_VENDOR_ID 0x05AC
	22
	23	#define USB_REQ_GET_REPORT 0x01
	24	#define USB_REQ_SET_REPORT 0x09
	25
	26	#define ACD_USB_TIMEOUT 250
	27
	28	#define ACD_USB_EDID 0x0302
	29	#define ACD_USB_BRIGHTNESS 0x0310
	30
	31	#define ACD_BTN_NONE 0
	32	#define ACD_BTN_BRIGHT_UP 3
	33	#define ACD_BTN_BRIGHT_DOWN 4
	34
	35	#define ACD_URB_BUFFER_LEN 2
	36	#define ACD_MSG_BUFFER_LEN 2
	37
	38	#define APPLEDISPLAY_DEVICE(prod) \
	39	.match_flags = USB_DEVICE_ID_MATCH_DEVICE \| \
	40	USB_DEVICE_ID_MATCH_INT_CLASS \| \
	41	USB_DEVICE_ID_MATCH_INT_PROTOCOL, \
	42	.idVendor = APPLE_VENDOR_ID, \
	43	.idProduct = (prod), \
	44	.bInterfaceClass = USB_CLASS_HID, \
	45	.bInterfaceProtocol = 0x00
	46
	47	/* table of devices that work with this driver */
	48	static const struct usb_device_id appledisplay_table[] = {
	49	{ APPLEDISPLAY_DEVICE(0x9218) },
	50	{ APPLEDISPLAY_DEVICE(0x9219) },
	51	{ APPLEDISPLAY_DEVICE(0x921c) },
	52	{ APPLEDISPLAY_DEVICE(0x921d) },
	53	{ APPLEDISPLAY_DEVICE(0x9222) },
	54	{ APPLEDISPLAY_DEVICE(0x9226) },
	55	{ APPLEDISPLAY_DEVICE(0x9236) },
	56
	57	/* Terminating entry */
	58	{ }
	59	};
	60	MODULE_DEVICE_TABLE(usb, appledisplay_table);
	61
	62	/* Structure to hold all of our device specific stuff */
	63	struct appledisplay {
	64	struct usb_device udev; / usb device */
	65	struct urb urb; / usb request block */
	66	struct backlight_device bd; / backlight device */
	67	u8 urbdata; / interrupt URB data buffer */
	68	u8 msgdata; / control message data buffer */
	69
	70	struct delayed_work work;
	71	int button_pressed;
	72	struct mutex sysfslock; /* concurrent read and write */
	73	};
	74
	75	static atomic_t count_displays = ATOMIC_INIT(0);
	76
	77	static void appledisplay_complete(struct urb *urb)
	78	{
	79	struct appledisplay *pdata = urb->context;
	80	struct device *dev = &pdata->udev->dev;
	81	int status = urb->status;
	82	int retval;
	83
	84	switch (status) {
	85	case 0:
	86	/* success */
	87	break;
	88	case -EOVERFLOW:
	89	dev_err(dev,
	90	"OVERFLOW with data length %d, actual length is %d\n",
	91	ACD_URB_BUFFER_LEN, pdata->urb->actual_length);
	92	fallthrough;
	93	case -ECONNRESET:
	94	case -ENOENT:
	95	case -ESHUTDOWN:
	96	/* This urb is terminated, clean up */
	97	dev_dbg(dev, "%s - urb shuttingdown with status: %d\n",
	98	__func__, status);
	99	return;
	100	default:
	101	dev_dbg(dev, "%s - nonzero urb status received: %d\n",
	102	__func__, status);
	103	goto exit;
	104	}
	105
	106	switch(pdata->urbdata[1]) {
	107	case ACD_BTN_BRIGHT_UP:
	108	case ACD_BTN_BRIGHT_DOWN:
	109	pdata->button_pressed = 1;
	110	/*
	111	* there is a window during which no device
	112	* is registered
	113	*/
	114	if (pdata->bd )
	115	schedule_delayed_work(&pdata->work, 0);
	116	break;
	117	case ACD_BTN_NONE:
	118	default:
	119	pdata->button_pressed = 0;
	120	break;
	121	}
	122
	123	exit:
	124	retval = usb_submit_urb(pdata->urb, GFP_ATOMIC);
	125	if (retval) {
	126	dev_err(dev, "%s - usb_submit_urb failed with result %d\n",
	127	__func__, retval);
	128	}
	129	}
	130
	131	static int appledisplay_bl_update_status(struct backlight_device *bd)
	132	{
	133	struct appledisplay *pdata = bl_get_data(bd);
	134	int retval;
	135
	136	mutex_lock(&pdata->sysfslock);
	137	pdata->msgdata[0] = 0x10;
	138	pdata->msgdata[1] = bd->props.brightness;
	139
	140	retval = usb_control_msg(
	141	pdata->udev,
	142	usb_sndctrlpipe(pdata->udev, 0),
	143	USB_REQ_SET_REPORT,
	144	USB_DIR_OUT \| USB_TYPE_CLASS \| USB_RECIP_INTERFACE,
	145	ACD_USB_BRIGHTNESS,
	146	0,
	147	pdata->msgdata, 2,
	148	ACD_USB_TIMEOUT);
	149	mutex_unlock(&pdata->sysfslock);
	150
	151	if (retval < 0)
	152	return retval;
	153	else
	154	return 0;
	155	}
	156
	157	static int appledisplay_bl_get_brightness(struct backlight_device *bd)
	158	{
	159	struct appledisplay *pdata = bl_get_data(bd);
	160	int retval, brightness;
	161
	162	mutex_lock(&pdata->sysfslock);
	163	retval = usb_control_msg(
	164	pdata->udev,
	165	usb_rcvctrlpipe(pdata->udev, 0),
	166	USB_REQ_GET_REPORT,
	167	USB_DIR_IN \| USB_TYPE_CLASS \| USB_RECIP_INTERFACE,
	168	ACD_USB_BRIGHTNESS,
	169	0,
	170	pdata->msgdata, 2,
	171	ACD_USB_TIMEOUT);
	172	if (retval < 2) {
	173	if (retval >= 0)
	174	retval = -EMSGSIZE;
	175	} else {
	176	brightness = pdata->msgdata[1];
	177	}
	178	mutex_unlock(&pdata->sysfslock);
	179
	180	if (retval < 0)
	181	return retval;
	182	else
	183	return brightness;
	184	}
	185
	186	static const struct backlight_ops appledisplay_bl_data = {
	187	.get_brightness = appledisplay_bl_get_brightness,
	188	.update_status = appledisplay_bl_update_status,
	189	};
	190
	191	static void appledisplay_work(struct work_struct *work)
	192	{
	193	struct appledisplay *pdata =
	194	container_of(work, struct appledisplay, work.work);
	195	int retval;
	196
	197	retval = appledisplay_bl_get_brightness(pdata->bd);
	198	if (retval >= 0)
	199	pdata->bd->props.brightness = retval;
	200
	201	/* Poll again in about 125ms if there's still a button pressed */
	202	if (pdata->button_pressed)
	203	schedule_delayed_work(&pdata->work, HZ / 8);
	204	}
	205
	206	static int appledisplay_probe(struct usb_interface *iface,
	207	const struct usb_device_id *id)
	208	{
	209	struct backlight_properties props;
	210	struct backlight_device *backlight;
	211	struct appledisplay *pdata;
	212	struct usb_device *udev = interface_to_usbdev(iface);
	213	struct usb_endpoint_descriptor *endpoint;
	214	int int_in_endpointAddr = 0;
	215	int retval, brightness;
	216	char bl_name[20];
	217
	218	/* set up the endpoint information */
	219	/* use only the first interrupt-in endpoint */
	220	retval = usb_find_int_in_endpoint(iface->cur_altsetting, &endpoint);
	221	if (retval) {
	222	dev_err(&iface->dev, "Could not find int-in endpoint\n");
	223	return retval;
	224	}
	225
	226	int_in_endpointAddr = endpoint->bEndpointAddress;
	227
	228	/* allocate memory for our device state and initialize it */
	229	pdata = kzalloc(sizeof(struct appledisplay), GFP_KERNEL);
	230	if (!pdata) {
	231	retval = -ENOMEM;
	232	goto error;
	233	}
	234
	235	pdata->udev = udev;
	236
	237	INIT_DELAYED_WORK(&pdata->work, appledisplay_work);
	238	mutex_init(&pdata->sysfslock);
	239
	240	/* Allocate buffer for control messages */
	241	pdata->msgdata = kmalloc(ACD_MSG_BUFFER_LEN, GFP_KERNEL);
	242	if (!pdata->msgdata) {
	243	retval = -ENOMEM;
	244	goto error;
	245	}
	246
	247	/* Allocate interrupt URB */
	248	pdata->urb = usb_alloc_urb(0, GFP_KERNEL);
	249	if (!pdata->urb) {
	250	retval = -ENOMEM;
	251	goto error;
	252	}
	253
	254	/* Allocate buffer for interrupt data */
	255	pdata->urbdata = usb_alloc_coherent(pdata->udev, ACD_URB_BUFFER_LEN,
	256	GFP_KERNEL, &pdata->urb->transfer_dma);
	257	if (!pdata->urbdata) {
	258	retval = -ENOMEM;
	259	dev_err(&iface->dev, "Allocating URB buffer failed\n");
	260	goto error;
	261	}
	262
	263	/* Configure interrupt URB */
	264	usb_fill_int_urb(pdata->urb, udev,
	265	usb_rcvintpipe(udev, int_in_endpointAddr),
	266	pdata->urbdata, ACD_URB_BUFFER_LEN, appledisplay_complete,
	267	pdata, 1);
	268	pdata->urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
	269	if (usb_submit_urb(pdata->urb, GFP_KERNEL)) {
	270	retval = -EIO;
	271	dev_err(&iface->dev, "Submitting URB failed\n");
	272	goto error;
	273	}
	274
	275	/* Register backlight device */
	276	snprintf(bl_name, sizeof(bl_name), "appledisplay%d",
	277	atomic_inc_return(&count_displays) - 1);
	278	memset(&props, 0, sizeof(struct backlight_properties));
	279	props.type = BACKLIGHT_RAW;
	280	props.max_brightness = 0xff;
	281	backlight = backlight_device_register(bl_name, NULL, pdata,
	282	&appledisplay_bl_data, &props);
	283	if (IS_ERR(backlight)) {
	284	dev_err(&iface->dev, "Backlight registration failed\n");
	285	retval = PTR_ERR(backlight);
	286	goto error;
	287	}
	288	pdata->bd = backlight;
	289
	290	/* Try to get brightness */
	291	brightness = appledisplay_bl_get_brightness(pdata->bd);
	292
	293	if (brightness < 0) {
	294	retval = brightness;
	295	dev_err(&iface->dev,
	296	"Error while getting initial brightness: %d\n", retval);
	297	goto error;
	298	}
	299
	300	/* Set brightness in backlight device */
	301	pdata->bd->props.brightness = brightness;
	302
	303	/* save our data pointer in the interface device */
	304	usb_set_intfdata(iface, pdata);
	305
	306	printk(KERN_INFO "appledisplay: Apple Cinema Display connected\n");
	307
	308	return 0;
	309
	310	error:
	311	if (pdata) {
	312	if (pdata->urb) {
	313	usb_kill_urb(pdata->urb);
	314	cancel_delayed_work_sync(&pdata->work);
	315	usb_free_coherent(pdata->udev, ACD_URB_BUFFER_LEN,
	316	pdata->urbdata, pdata->urb->transfer_dma);
	317	usb_free_urb(pdata->urb);
	318	}
	319	if (!IS_ERR(pdata->bd))
	320	backlight_device_unregister(pdata->bd);
	321	kfree(pdata->msgdata);
	322	}
	323	usb_set_intfdata(iface, NULL);
	324	kfree(pdata);
	325	return retval;
	326	}
	327
	328	static void appledisplay_disconnect(struct usb_interface *iface)
	329	{
	330	struct appledisplay *pdata = usb_get_intfdata(iface);
	331
	332	if (pdata) {
	333	usb_kill_urb(pdata->urb);
	334	cancel_delayed_work_sync(&pdata->work);
	335	backlight_device_unregister(pdata->bd);
	336	usb_free_coherent(pdata->udev, ACD_URB_BUFFER_LEN,
	337	pdata->urbdata, pdata->urb->transfer_dma);
	338	usb_free_urb(pdata->urb);
	339	kfree(pdata->msgdata);
	340	kfree(pdata);
	341	}
	342
	343	printk(KERN_INFO "appledisplay: Apple Cinema Display disconnected\n");
	344	}
	345
	346	static struct usb_driver appledisplay_driver = {
	347	.name = "appledisplay",
	348	.probe = appledisplay_probe,
	349	.disconnect = appledisplay_disconnect,
	350	.id_table = appledisplay_table,
	351	};
	352	module_usb_driver(appledisplay_driver);
	353
	354	MODULE_AUTHOR("Michael Hanselmann");
	355	MODULE_DESCRIPTION("Apple Cinema Display driver");
	356	MODULE_LICENSE("GPL");