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

/*
 * Apple Cinema Display driver
 *
 * Copyright (C) 2006  Michael Hanselmann (linux-kernel@hansmi.ch)
 *
 * Thanks to Caskey L. Dickson for his work with acdctl.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/usb.h>
#include <linux/backlight.h>
#include <linux/timer.h>
#include <linux/workqueue.h>
#include <asm/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) },

	/* 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;
	spinlock_t lock;
};

static atomic_t count_displays = ATOMIC_INIT(0);
static struct workqueue_struct *wq;

static void appledisplay_complete(struct urb *urb)
{
	struct appledisplay *pdata = urb->context;
	unsigned long flags;
	int status = urb->status;
	int retval;

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

	spin_lock_irqsave(&pdata->lock, flags);

	switch(pdata->urbdata[1]) {
	case ACD_BTN_BRIGHT_UP:
	case ACD_BTN_BRIGHT_DOWN:
		pdata->button_pressed = 1;
		queue_delayed_work(wq, &pdata->work, 0);
		break;
	case ACD_BTN_NONE:
	default:
		pdata->button_pressed = 0;
		break;
	}

	spin_unlock_irqrestore(&pdata->lock, flags);

exit:
	retval = usb_submit_urb(pdata->urb, GFP_ATOMIC);
	if (retval) {
		dev_err(&pdata->udev->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;

	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);

	return retval;
}

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

	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 < 0)
		return retval;
	else
		return pdata->msgdata[1];
}

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_host_interface *iface_desc;
	struct usb_endpoint_descriptor *endpoint;
	int int_in_endpointAddr = 0;
	int i, retval = -ENOMEM, brightness;
	char bl_name[20];

	/* set up the endpoint information */
	/* use only the first interrupt-in endpoint */
	iface_desc = iface->cur_altsetting;
	for (i = 0; i < iface_desc->desc.bNumEndpoints; i++) {
		endpoint = &iface_desc->endpoint[i].desc;
		if (!int_in_endpointAddr && usb_endpoint_is_int_in(endpoint)) {
			/* we found an interrupt in endpoint */
			int_in_endpointAddr = endpoint->bEndpointAddress;
			break;
		}
	}
	if (!int_in_endpointAddr) {
		dev_err(&iface->dev, "Could not find int-in endpoint\n");
		return -EIO;
	}

	/* allocate memory for our device state and initialize it */
	pdata = kzalloc(sizeof(struct appledisplay), GFP_KERNEL);
	if (!pdata) {
		retval = -ENOMEM;
		dev_err(&iface->dev, "Out of memory\n");
		goto error;
	}

	pdata->udev = udev;

	spin_lock_init(&pdata->lock);
	INIT_DELAYED_WORK(&pdata->work, appledisplay_work);

	/* Allocate buffer for control messages */
	pdata->msgdata = kmalloc(ACD_MSG_BUFFER_LEN, GFP_KERNEL);
	if (!pdata->msgdata) {
		retval = -ENOMEM;
		dev_err(&iface->dev,
			"Allocating buffer for control messages failed\n");
		goto error;
	}

	/* Allocate interrupt URB */
	pdata->urb = usb_alloc_urb(0, GFP_KERNEL);
	if (!pdata->urb) {
		retval = -ENOMEM;
		dev_err(&iface->dev, "Allocating URB failed\n");
		goto error;
	}

	/* Allocate buffer for interrupt data */
	pdata->urbdata = usb_buffer_alloc(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);
	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.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);
			if (pdata->urbdata)
				usb_buffer_free(pdata->udev, ACD_URB_BUFFER_LEN,
					pdata->urbdata, pdata->urb->transfer_dma);
			usb_free_urb(pdata->urb);
		}
		if (pdata->bd && !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(&pdata->work);
		backlight_device_unregister(pdata->bd);
		usb_buffer_free(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,
};

static int __init appledisplay_init(void)
{
	wq = create_singlethread_workqueue("appledisplay");
	if (!wq) {
		printk(KERN_ERR "appledisplay: Could not create work queue\n");
		return -ENOMEM;
	}

	return usb_register(&appledisplay_driver);
}

static void __exit appledisplay_exit(void)
{
	flush_workqueue(wq);
	destroy_workqueue(wq);
	usb_deregister(&appledisplay_driver);
}

MODULE_AUTHOR("Michael Hanselmann");
MODULE_DESCRIPTION("Apple Cinema Display driver");
MODULE_LICENSE("GPL");

module_init(appledisplay_init);
module_exit(appledisplay_exit);
Commit	Line	Data
069e8a65	1	/*
	2	* Apple Cinema Display driver
	3	*
	4	* Copyright (C) 2006 Michael Hanselmann (linux-kernel@hansmi.ch)
	5	*
	6	* Thanks to Caskey L. Dickson for his work with acdctl.
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
	21	*/
	22
069e8a65	23	#include <linux/kernel.h>
	24	#include <linux/errno.h>
	25	#include <linux/init.h>
	26	#include <linux/module.h>
	27	#include <linux/usb.h>
	28	#include <linux/backlight.h>
	29	#include <linux/timer.h>
	30	#include <linux/workqueue.h>
	31	#include <asm/atomic.h>
069e8a65	32
	33	#define APPLE_VENDOR_ID 0x05AC
	34
	35	#define USB_REQ_GET_REPORT 0x01
	36	#define USB_REQ_SET_REPORT 0x09
	37
	38	#define ACD_USB_TIMEOUT 250
	39
	40	#define ACD_USB_EDID 0x0302
	41	#define ACD_USB_BRIGHTNESS 0x0310
	42
	43	#define ACD_BTN_NONE 0
	44	#define ACD_BTN_BRIGHT_UP 3
	45	#define ACD_BTN_BRIGHT_DOWN 4
	46
	47	#define ACD_URB_BUFFER_LEN 2
	48	#define ACD_MSG_BUFFER_LEN 2
	49
	50	#define APPLEDISPLAY_DEVICE(prod) \
	51	.match_flags = USB_DEVICE_ID_MATCH_DEVICE \| \
	52	USB_DEVICE_ID_MATCH_INT_CLASS \| \
	53	USB_DEVICE_ID_MATCH_INT_PROTOCOL, \
	54	.idVendor = APPLE_VENDOR_ID, \
	55	.idProduct = (prod), \
	56	.bInterfaceClass = USB_CLASS_HID, \
	57	.bInterfaceProtocol = 0x00
	58
	59	/* table of devices that work with this driver */
33b9e162	60	static const struct usb_device_id appledisplay_table[] = {
069e8a65	61	{ APPLEDISPLAY_DEVICE(0x9218) },
069e8a65	62	{ APPLEDISPLAY_DEVICE(0x9219) },
4b372072	63	{ APPLEDISPLAY_DEVICE(0x921c) },
069e8a65	64	{ APPLEDISPLAY_DEVICE(0x921d) },
	65
	66	/* Terminating entry */
	67	{ }
	68	};
	69	MODULE_DEVICE_TABLE(usb, appledisplay_table);
	70
	71	/* Structure to hold all of our device specific stuff */
	72	struct appledisplay {
	73	struct usb_device udev; / usb device */
	74	struct urb urb; / usb request block */
	75	struct backlight_device bd; / backlight device */
37e9066b	76	u8 urbdata; / interrupt URB data buffer */
37e9066b	77	u8 msgdata; / control message data buffer */
069e8a65	78
6d5aefb8	79	struct delayed_work work;
069e8a65	80	int button_pressed;
	81	spinlock_t lock;
	82	};
	83
	84	static atomic_t count_displays = ATOMIC_INIT(0);
	85	static struct workqueue_struct *wq;
	86
7d12e780	87	static void appledisplay_complete(struct urb *urb)
069e8a65	88	{
	89	struct appledisplay *pdata = urb->context;
	90	unsigned long flags;
13f9782d	91	int status = urb->status;
069e8a65	92	int retval;
069e8a65	93
13f9782d	94	switch (status) {
069e8a65	95	case 0:
	96	/* success */
	97	break;
	98	case -EOVERFLOW:
	99	printk(KERN_ERR "appletouch: OVERFLOW with data "
	100	"length %d, actual length is %d\n",
	101	ACD_URB_BUFFER_LEN, pdata->urb->actual_length);
	102	case -ECONNRESET:
	103	case -ENOENT:
	104	case -ESHUTDOWN:
	105	/* This urb is terminated, clean up */
13f9782d	106	dbg("%s - urb shuttingdown with status: %d",
441b62c1	107	__func__, status);
069e8a65	108	return;
	109	default:
	110	dbg("%s - nonzero urb status received: %d",
441b62c1	111	__func__, status);
069e8a65	112	goto exit;
	113	}
	114
	115	spin_lock_irqsave(&pdata->lock, flags);
	116
	117	switch(pdata->urbdata[1]) {
	118	case ACD_BTN_BRIGHT_UP:
	119	case ACD_BTN_BRIGHT_DOWN:
	120	pdata->button_pressed = 1;
6d5aefb8	121	queue_delayed_work(wq, &pdata->work, 0);
069e8a65	122	break;
	123	case ACD_BTN_NONE:
	124	default:
	125	pdata->button_pressed = 0;
	126	break;
	127	}
	128
	129	spin_unlock_irqrestore(&pdata->lock, flags);
	130
	131	exit:
	132	retval = usb_submit_urb(pdata->urb, GFP_ATOMIC);
	133	if (retval) {
fd3f1917 GKH	134	dev_err(&pdata->udev->dev,
fd3f1917 GKH	135	"%s - usb_submit_urb failed with result %d\n",
441b62c1	136	__func__, retval);
069e8a65	137	}
	138	}
	139
	140	static int appledisplay_bl_update_status(struct backlight_device *bd)
	141	{
655bfd7a	142	struct appledisplay *pdata = bl_get_data(bd);
069e8a65	143	int retval;
	144
	145	pdata->msgdata[0] = 0x10;
599a52d1	146	pdata->msgdata[1] = bd->props.brightness;
069e8a65	147
	148	retval = usb_control_msg(
	149	pdata->udev,
	150	usb_sndctrlpipe(pdata->udev, 0),
	151	USB_REQ_SET_REPORT,
	152	USB_DIR_OUT \| USB_TYPE_CLASS \| USB_RECIP_INTERFACE,
	153	ACD_USB_BRIGHTNESS,
	154	0,
	155	pdata->msgdata, 2,
	156	ACD_USB_TIMEOUT);
	157
	158	return retval;
	159	}
	160
	161	static int appledisplay_bl_get_brightness(struct backlight_device *bd)
	162	{
655bfd7a	163	struct appledisplay *pdata = bl_get_data(bd);
069e8a65	164	int retval;
	165
	166	retval = usb_control_msg(
	167	pdata->udev,
	168	usb_rcvctrlpipe(pdata->udev, 0),
	169	USB_REQ_GET_REPORT,
	170	USB_DIR_IN \| USB_TYPE_CLASS \| USB_RECIP_INTERFACE,
	171	ACD_USB_BRIGHTNESS,
	172	0,
	173	pdata->msgdata, 2,
	174	ACD_USB_TIMEOUT);
	175
	176	if (retval < 0)
	177	return retval;
	178	else
	179	return pdata->msgdata[1];
	180	}
	181
cedf8a78	182	static const struct backlight_ops appledisplay_bl_data = {
069e8a65	183	.get_brightness = appledisplay_bl_get_brightness,
069e8a65	184	.update_status = appledisplay_bl_update_status,
069e8a65	185	};
069e8a65	186
6d5aefb8	187	static void appledisplay_work(struct work_struct *work)
069e8a65	188	{
6d5aefb8 DH	189	struct appledisplay *pdata =
6d5aefb8 DH	190	container_of(work, struct appledisplay, work.work);
069e8a65	191	int retval;
069e8a65	192
069e8a65	193	retval = appledisplay_bl_get_brightness(pdata->bd);
069e8a65	194	if (retval >= 0)
599a52d1	195	pdata->bd->props.brightness = retval;
069e8a65	196
	197	/* Poll again in about 125ms if there's still a button pressed */
	198	if (pdata->button_pressed)
	199	schedule_delayed_work(&pdata->work, HZ / 8);
	200	}
	201
	202	static int appledisplay_probe(struct usb_interface *iface,
	203	const struct usb_device_id *id)
	204	{
a19a6ee6	205	struct backlight_properties props;
069e8a65	206	struct appledisplay *pdata;
	207	struct usb_device *udev = interface_to_usbdev(iface);
	208	struct usb_host_interface *iface_desc;
	209	struct usb_endpoint_descriptor *endpoint;
	210	int int_in_endpointAddr = 0;
	211	int i, retval = -ENOMEM, brightness;
	212	char bl_name[20];
	213
	214	/* set up the endpoint information */
	215	/* use only the first interrupt-in endpoint */
	216	iface_desc = iface->cur_altsetting;
	217	for (i = 0; i < iface_desc->desc.bNumEndpoints; i++) {
	218	endpoint = &iface_desc->endpoint[i].desc;
16f96376	219	if (!int_in_endpointAddr && usb_endpoint_is_int_in(endpoint)) {
069e8a65	220	/* we found an interrupt in endpoint */
	221	int_in_endpointAddr = endpoint->bEndpointAddress;
	222	break;
	223	}
	224	}
	225	if (!int_in_endpointAddr) {
fd3f1917	226	dev_err(&iface->dev, "Could not find int-in endpoint\n");
069e8a65	227	return -EIO;
	228	}
	229
	230	/* allocate memory for our device state and initialize it */
	231	pdata = kzalloc(sizeof(struct appledisplay), GFP_KERNEL);
	232	if (!pdata) {
	233	retval = -ENOMEM;
fd3f1917	234	dev_err(&iface->dev, "Out of memory\n");
069e8a65	235	goto error;
	236	}
	237
	238	pdata->udev = udev;
	239
	240	spin_lock_init(&pdata->lock);
6d5aefb8	241	INIT_DELAYED_WORK(&pdata->work, appledisplay_work);
069e8a65	242
	243	/* Allocate buffer for control messages */
	244	pdata->msgdata = kmalloc(ACD_MSG_BUFFER_LEN, GFP_KERNEL);
	245	if (!pdata->msgdata) {
	246	retval = -ENOMEM;
fd3f1917 GKH	247	dev_err(&iface->dev,
fd3f1917 GKH	248	"Allocating buffer for control messages failed\n");
069e8a65	249	goto error;
	250	}
	251
	252	/* Allocate interrupt URB */
	253	pdata->urb = usb_alloc_urb(0, GFP_KERNEL);
	254	if (!pdata->urb) {
	255	retval = -ENOMEM;
fd3f1917	256	dev_err(&iface->dev, "Allocating URB failed\n");
069e8a65	257	goto error;
	258	}
	259
	260	/* Allocate buffer for interrupt data */
	261	pdata->urbdata = usb_buffer_alloc(pdata->udev, ACD_URB_BUFFER_LEN,
	262	GFP_KERNEL, &pdata->urb->transfer_dma);
	263	if (!pdata->urbdata) {
	264	retval = -ENOMEM;
fd3f1917	265	dev_err(&iface->dev, "Allocating URB buffer failed\n");
069e8a65	266	goto error;
	267	}
	268
	269	/* Configure interrupt URB */
	270	usb_fill_int_urb(pdata->urb, udev,
	271	usb_rcvintpipe(udev, int_in_endpointAddr),
	272	pdata->urbdata, ACD_URB_BUFFER_LEN, appledisplay_complete,
	273	pdata, 1);
	274	if (usb_submit_urb(pdata->urb, GFP_KERNEL)) {
	275	retval = -EIO;
fd3f1917	276	dev_err(&iface->dev, "Submitting URB failed\n");
069e8a65	277	goto error;
	278	}
	279
	280	/* Register backlight device */
	281	snprintf(bl_name, sizeof(bl_name), "appledisplay%d",
	282	atomic_inc_return(&count_displays) - 1);
a19a6ee6 MG	283	memset(&props, 0, sizeof(struct backlight_properties));
a19a6ee6 MG	284	props.max_brightness = 0xff;
81450b73	285	pdata->bd = backlight_device_register(bl_name, NULL, pdata,
a19a6ee6	286	&appledisplay_bl_data, &props);
069e8a65	287	if (IS_ERR(pdata->bd)) {
fd3f1917	288	dev_err(&iface->dev, "Backlight registration failed\n");
cedf8a78	289	retval = PTR_ERR(pdata->bd);
069e8a65	290	goto error;
	291	}
	292
	293	/* Try to get brightness */
069e8a65	294	brightness = appledisplay_bl_get_brightness(pdata->bd);
069e8a65	295
	296	if (brightness < 0) {
	297	retval = brightness;
fd3f1917 GKH	298	dev_err(&iface->dev,
fd3f1917 GKH	299	"Error while getting initial brightness: %d\n", retval);
069e8a65	300	goto error;
	301	}
	302
	303	/* Set brightness in backlight device */
599a52d1	304	pdata->bd->props.brightness = brightness;
069e8a65	305
	306	/* save our data pointer in the interface device */
	307	usb_set_intfdata(iface, pdata);
	308
	309	printk(KERN_INFO "appledisplay: Apple Cinema Display connected\n");
	310
	311	return 0;
	312
	313	error:
	314	if (pdata) {
	315	if (pdata->urb) {
	316	usb_kill_urb(pdata->urb);
	317	if (pdata->urbdata)
	318	usb_buffer_free(pdata->udev, ACD_URB_BUFFER_LEN,
	319	pdata->urbdata, pdata->urb->transfer_dma);
	320	usb_free_urb(pdata->urb);
	321	}
bedf0883	322	if (pdata->bd && !IS_ERR(pdata->bd))
069e8a65	323	backlight_device_unregister(pdata->bd);
	324	kfree(pdata->msgdata);
	325	}
	326	usb_set_intfdata(iface, NULL);
	327	kfree(pdata);
	328	return retval;
	329	}
	330
	331	static void appledisplay_disconnect(struct usb_interface *iface)
	332	{
	333	struct appledisplay *pdata = usb_get_intfdata(iface);
	334
	335	if (pdata) {
	336	usb_kill_urb(pdata->urb);
	337	cancel_delayed_work(&pdata->work);
	338	backlight_device_unregister(pdata->bd);
	339	usb_buffer_free(pdata->udev, ACD_URB_BUFFER_LEN,
	340	pdata->urbdata, pdata->urb->transfer_dma);
	341	usb_free_urb(pdata->urb);
	342	kfree(pdata->msgdata);
	343	kfree(pdata);
	344	}
	345
	346	printk(KERN_INFO "appledisplay: Apple Cinema Display disconnected\n");
	347	}
	348
	349	static struct usb_driver appledisplay_driver = {
	350	.name = "appledisplay",
	351	.probe = appledisplay_probe,
	352	.disconnect = appledisplay_disconnect,
	353	.id_table = appledisplay_table,
	354	};
	355
	356	static int __init appledisplay_init(void)
	357	{
	358	wq = create_singlethread_workqueue("appledisplay");
	359	if (!wq) {
fd3f1917	360	printk(KERN_ERR "appledisplay: Could not create work queue\n");
069e8a65	361	return -ENOMEM;
	362	}
	363
	364	return usb_register(&appledisplay_driver);
	365	}
	366
	367	static void __exit appledisplay_exit(void)
	368	{
	369	flush_workqueue(wq);
	370	destroy_workqueue(wq);
	371	usb_deregister(&appledisplay_driver);
	372	}
	373
	374	MODULE_AUTHOR("Michael Hanselmann");
	375	MODULE_DESCRIPTION("Apple Cinema Display driver");
	376	MODULE_LICENSE("GPL");
	377
	378	module_init(appledisplay_init);
	379	module_exit(appledisplay_exit);