[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;
		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 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;
	pdata->bd = backlight_device_register(bl_name, NULL, pdata,
					      &appledisplay_bl_data, &props);
	if (IS_ERR(pdata->bd)) {
		dev_err(&iface->dev, "Backlight registration failed\n");
		retval = PTR_ERR(pdata->bd);
		goto error;
	}

	/* 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
5fd54ace	1	// SPDX-License-Identifier: GPL-2.0+
069e8a65	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.
069e8a65	8	*/
069e8a65	9
069e8a65	10	#include <linux/kernel.h>
	11	#include <linux/errno.h>
	12	#include <linux/init.h>
	13	#include <linux/module.h>
5a0e3ad6	14	#include <linux/slab.h>
069e8a65	15	#include <linux/usb.h>
	16	#include <linux/backlight.h>
	17	#include <linux/timer.h>
	18	#include <linux/workqueue.h>
60063497	19	#include <linux/atomic.h>
069e8a65	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 */
33b9e162	48	static const struct usb_device_id appledisplay_table[] = {
069e8a65	49	{ APPLEDISPLAY_DEVICE(0x9218) },
069e8a65	50	{ APPLEDISPLAY_DEVICE(0x9219) },
4b372072	51	{ APPLEDISPLAY_DEVICE(0x921c) },
069e8a65	52	{ APPLEDISPLAY_DEVICE(0x921d) },
f6501f49	53	{ APPLEDISPLAY_DEVICE(0x9222) },
d7859905	54	{ APPLEDISPLAY_DEVICE(0x9226) },
e7d3b6e2	55	{ APPLEDISPLAY_DEVICE(0x9236) },
069e8a65	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 */
37e9066b	67	u8 urbdata; / interrupt URB data buffer */
37e9066b	68	u8 msgdata; / control message data buffer */
069e8a65	69
6d5aefb8	70	struct delayed_work work;
069e8a65	71	int button_pressed;
552e1f26	72	struct mutex sysfslock; /* concurrent read and write */
069e8a65	73	};
	74
	75	static atomic_t count_displays = ATOMIC_INIT(0);
069e8a65	76
7d12e780	77	static void appledisplay_complete(struct urb *urb)
069e8a65	78	{
069e8a65	79	struct appledisplay *pdata = urb->context;
0a3fd536	80	struct device *dev = &pdata->udev->dev;
13f9782d	81	int status = urb->status;
069e8a65	82	int retval;
069e8a65	83
13f9782d	84	switch (status) {
069e8a65	85	case 0:
	86	/* success */
	87	break;
	88	case -EOVERFLOW:
0a3fd536 GKH	89	dev_err(dev,
0a3fd536 GKH	90	"OVERFLOW with data length %d, actual length is %d\n",
069e8a65	91	ACD_URB_BUFFER_LEN, pdata->urb->actual_length);
0d9b6d49	92	fallthrough;
069e8a65	93	case -ECONNRESET:
	94	case -ENOENT:
	95	case -ESHUTDOWN:
	96	/* This urb is terminated, clean up */
0a3fd536	97	dev_dbg(dev, "%s - urb shuttingdown with status: %d\n",
441b62c1	98	__func__, status);
069e8a65	99	return;
069e8a65	100	default:
e2b86c1d	101	dev_dbg(dev, "%s - nonzero urb status received: %d\n",
441b62c1	102	__func__, status);
069e8a65	103	goto exit;
	104	}
	105
069e8a65	106	switch(pdata->urbdata[1]) {
	107	case ACD_BTN_BRIGHT_UP:
	108	case ACD_BTN_BRIGHT_DOWN:
	109	pdata->button_pressed = 1;
6a0bb434	110	schedule_delayed_work(&pdata->work, 0);
069e8a65	111	break;
	112	case ACD_BTN_NONE:
	113	default:
	114	pdata->button_pressed = 0;
	115	break;
	116	}
	117
069e8a65	118	exit:
	119	retval = usb_submit_urb(pdata->urb, GFP_ATOMIC);
	120	if (retval) {
0a3fd536	121	dev_err(dev, "%s - usb_submit_urb failed with result %d\n",
441b62c1	122	__func__, retval);
069e8a65	123	}
	124	}
	125
	126	static int appledisplay_bl_update_status(struct backlight_device *bd)
	127	{
655bfd7a	128	struct appledisplay *pdata = bl_get_data(bd);
069e8a65	129	int retval;
069e8a65	130
552e1f26	131	mutex_lock(&pdata->sysfslock);
069e8a65	132	pdata->msgdata[0] = 0x10;
599a52d1	133	pdata->msgdata[1] = bd->props.brightness;
069e8a65	134
	135	retval = usb_control_msg(
	136	pdata->udev,
	137	usb_sndctrlpipe(pdata->udev, 0),
	138	USB_REQ_SET_REPORT,
	139	USB_DIR_OUT \| USB_TYPE_CLASS \| USB_RECIP_INTERFACE,
	140	ACD_USB_BRIGHTNESS,
	141	0,
	142	pdata->msgdata, 2,
	143	ACD_USB_TIMEOUT);
552e1f26	144	mutex_unlock(&pdata->sysfslock);
09015855 MJ	145
	146	if (retval < 0)
	147	return retval;
	148	else
	149	return 0;
069e8a65	150	}
	151
	152	static int appledisplay_bl_get_brightness(struct backlight_device *bd)
	153	{
655bfd7a	154	struct appledisplay *pdata = bl_get_data(bd);
552e1f26	155	int retval, brightness;
069e8a65	156
552e1f26	157	mutex_lock(&pdata->sysfslock);
069e8a65	158	retval = usb_control_msg(
	159	pdata->udev,
	160	usb_rcvctrlpipe(pdata->udev, 0),
	161	USB_REQ_GET_REPORT,
	162	USB_DIR_IN \| USB_TYPE_CLASS \| USB_RECIP_INTERFACE,
	163	ACD_USB_BRIGHTNESS,
	164	0,
	165	pdata->msgdata, 2,
	166	ACD_USB_TIMEOUT);
91feb015 ON	167	if (retval < 2) {
	168	if (retval >= 0)
	169	retval = -EMSGSIZE;
	170	} else {
	171	brightness = pdata->msgdata[1];
	172	}
552e1f26	173	mutex_unlock(&pdata->sysfslock);
069e8a65	174
	175	if (retval < 0)
	176	return retval;
	177	else
552e1f26	178	return brightness;
069e8a65	179	}
069e8a65	180
cedf8a78	181	static const struct backlight_ops appledisplay_bl_data = {
069e8a65	182	.get_brightness = appledisplay_bl_get_brightness,
069e8a65	183	.update_status = appledisplay_bl_update_status,
069e8a65	184	};
069e8a65	185
6d5aefb8	186	static void appledisplay_work(struct work_struct *work)
069e8a65	187	{
6d5aefb8 DH	188	struct appledisplay *pdata =
6d5aefb8 DH	189	container_of(work, struct appledisplay, work.work);
069e8a65	190	int retval;
069e8a65	191
069e8a65	192	retval = appledisplay_bl_get_brightness(pdata->bd);
069e8a65	193	if (retval >= 0)
599a52d1	194	pdata->bd->props.brightness = retval;
069e8a65	195
	196	/* Poll again in about 125ms if there's still a button pressed */
	197	if (pdata->button_pressed)
	198	schedule_delayed_work(&pdata->work, HZ / 8);
	199	}
	200
	201	static int appledisplay_probe(struct usb_interface *iface,
	202	const struct usb_device_id *id)
	203	{
a19a6ee6	204	struct backlight_properties props;
069e8a65	205	struct appledisplay *pdata;
069e8a65	206	struct usb_device *udev = interface_to_usbdev(iface);
069e8a65	207	struct usb_endpoint_descriptor *endpoint;
069e8a65	208	int int_in_endpointAddr = 0;
c77b8855	209	int retval, brightness;
069e8a65	210	char bl_name[20];
	211
	212	/* set up the endpoint information */
	213	/* use only the first interrupt-in endpoint */
c77b8855 JH	214	retval = usb_find_int_in_endpoint(iface->cur_altsetting, &endpoint);
c77b8855 JH	215	if (retval) {
fd3f1917	216	dev_err(&iface->dev, "Could not find int-in endpoint\n");
c77b8855	217	return retval;
069e8a65	218	}
069e8a65	219
c77b8855 JH	220	int_in_endpointAddr = endpoint->bEndpointAddress;
c77b8855 JH	221
069e8a65	222	/* allocate memory for our device state and initialize it */
	223	pdata = kzalloc(sizeof(struct appledisplay), GFP_KERNEL);
	224	if (!pdata) {
	225	retval = -ENOMEM;
069e8a65	226	goto error;
	227	}
	228
	229	pdata->udev = udev;
	230
6d5aefb8	231	INIT_DELAYED_WORK(&pdata->work, appledisplay_work);
552e1f26	232	mutex_init(&pdata->sysfslock);
069e8a65	233
	234	/* Allocate buffer for control messages */
	235	pdata->msgdata = kmalloc(ACD_MSG_BUFFER_LEN, GFP_KERNEL);
	236	if (!pdata->msgdata) {
	237	retval = -ENOMEM;
069e8a65	238	goto error;
	239	}
	240
	241	/* Allocate interrupt URB */
	242	pdata->urb = usb_alloc_urb(0, GFP_KERNEL);
	243	if (!pdata->urb) {
	244	retval = -ENOMEM;
069e8a65	245	goto error;
	246	}
	247
	248	/* Allocate buffer for interrupt data */
997ea58e	249	pdata->urbdata = usb_alloc_coherent(pdata->udev, ACD_URB_BUFFER_LEN,
069e8a65	250	GFP_KERNEL, &pdata->urb->transfer_dma);
	251	if (!pdata->urbdata) {
	252	retval = -ENOMEM;
fd3f1917	253	dev_err(&iface->dev, "Allocating URB buffer failed\n");
069e8a65	254	goto error;
	255	}
	256
	257	/* Configure interrupt URB */
	258	usb_fill_int_urb(pdata->urb, udev,
	259	usb_rcvintpipe(udev, int_in_endpointAddr),
	260	pdata->urbdata, ACD_URB_BUFFER_LEN, appledisplay_complete,
	261	pdata, 1);
67f3a0d0	262	pdata->urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
069e8a65	263	if (usb_submit_urb(pdata->urb, GFP_KERNEL)) {
069e8a65	264	retval = -EIO;
fd3f1917	265	dev_err(&iface->dev, "Submitting URB failed\n");
069e8a65	266	goto error;
	267	}
	268
	269	/* Register backlight device */
	270	snprintf(bl_name, sizeof(bl_name), "appledisplay%d",
	271	atomic_inc_return(&count_displays) - 1);
a19a6ee6	272	memset(&props, 0, sizeof(struct backlight_properties));
bb7ca747	273	props.type = BACKLIGHT_RAW;
a19a6ee6	274	props.max_brightness = 0xff;
81450b73	275	pdata->bd = backlight_device_register(bl_name, NULL, pdata,
a19a6ee6	276	&appledisplay_bl_data, &props);
069e8a65	277	if (IS_ERR(pdata->bd)) {
fd3f1917	278	dev_err(&iface->dev, "Backlight registration failed\n");
cedf8a78	279	retval = PTR_ERR(pdata->bd);
069e8a65	280	goto error;
	281	}
	282
	283	/* Try to get brightness */
069e8a65	284	brightness = appledisplay_bl_get_brightness(pdata->bd);
069e8a65	285
	286	if (brightness < 0) {
	287	retval = brightness;
fd3f1917 GKH	288	dev_err(&iface->dev,
fd3f1917 GKH	289	"Error while getting initial brightness: %d\n", retval);
069e8a65	290	goto error;
	291	}
	292
	293	/* Set brightness in backlight device */
599a52d1	294	pdata->bd->props.brightness = brightness;
069e8a65	295
	296	/* save our data pointer in the interface device */
	297	usb_set_intfdata(iface, pdata);
	298
	299	printk(KERN_INFO "appledisplay: Apple Cinema Display connected\n");
	300
	301	return 0;
	302
	303	error:
	304	if (pdata) {
	305	if (pdata->urb) {
	306	usb_kill_urb(pdata->urb);
91feb015	307	cancel_delayed_work_sync(&pdata->work);
d8a84935	308	usb_free_coherent(pdata->udev, ACD_URB_BUFFER_LEN,
069e8a65	309	pdata->urbdata, pdata->urb->transfer_dma);
	310	usb_free_urb(pdata->urb);
	311	}
c60b89aa	312	if (!IS_ERR(pdata->bd))
069e8a65	313	backlight_device_unregister(pdata->bd);
	314	kfree(pdata->msgdata);
	315	}
	316	usb_set_intfdata(iface, NULL);
	317	kfree(pdata);
	318	return retval;
	319	}
	320
	321	static void appledisplay_disconnect(struct usb_interface *iface)
	322	{
	323	struct appledisplay *pdata = usb_get_intfdata(iface);
	324
	325	if (pdata) {
	326	usb_kill_urb(pdata->urb);
6a0bb434	327	cancel_delayed_work_sync(&pdata->work);
069e8a65	328	backlight_device_unregister(pdata->bd);
997ea58e	329	usb_free_coherent(pdata->udev, ACD_URB_BUFFER_LEN,
069e8a65	330	pdata->urbdata, pdata->urb->transfer_dma);
	331	usb_free_urb(pdata->urb);
	332	kfree(pdata->msgdata);
	333	kfree(pdata);
	334	}
	335
	336	printk(KERN_INFO "appledisplay: Apple Cinema Display disconnected\n");
	337	}
	338
	339	static struct usb_driver appledisplay_driver = {
	340	.name = "appledisplay",
	341	.probe = appledisplay_probe,
	342	.disconnect = appledisplay_disconnect,
	343	.id_table = appledisplay_table,
	344	};
183fba0a	345	module_usb_driver(appledisplay_driver);
069e8a65	346
	347	MODULE_AUTHOR("Michael Hanselmann");
	348	MODULE_DESCRIPTION("Apple Cinema Display driver");
	349	MODULE_LICENSE("GPL");