[linux.git] / drivers / hid / hid-roccat.c

/*
 * Roccat driver for Linux
 *
 * Copyright (c) 2010 Stefan Achatz <[email protected]>
 */

/*
 * 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.
 */

/*
 * Module roccat is a char device used to report special events of roccat
 * hardware to userland. These events include requests for on-screen-display of
 * profile or dpi settings or requests for execution of macro sequences that are
 * not stored in device. The information in these events depends on hid device
 * implementation and contains data that is not available in a single hid event
 * or else hidraw could have been used.
 * It is inspired by hidraw, but uses only one circular buffer for all readers.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/cdev.h>
#include <linux/poll.h>
#include <linux/sched/signal.h>
#include <linux/hid-roccat.h>
#include <linux/module.h>

#define ROCCAT_FIRST_MINOR 0
#define ROCCAT_MAX_DEVICES 8

/* should be a power of 2 for performance reason */
#define ROCCAT_CBUF_SIZE 16

struct roccat_report {
	uint8_t *value;
};

struct roccat_device {
	unsigned int minor;
	int report_size;
	int open;
	int exist;
	wait_queue_head_t wait;
	struct device *dev;
	struct hid_device *hid;
	struct list_head readers;
	/* protects modifications of readers list */
	struct mutex readers_lock;

	/*
	 * circular_buffer has one writer and multiple readers with their own
	 * read pointers
	 */
	struct roccat_report cbuf[ROCCAT_CBUF_SIZE];
	int cbuf_end;
	struct mutex cbuf_lock;
};

struct roccat_reader {
	struct list_head node;
	struct roccat_device *device;
	int cbuf_start;
};

static int roccat_major;
static struct cdev roccat_cdev;

static struct roccat_device *devices[ROCCAT_MAX_DEVICES];
/* protects modifications of devices array */
static DEFINE_MUTEX(devices_lock);

static ssize_t roccat_read(struct file *file, char __user *buffer,
		size_t count, loff_t *ppos)
{
	struct roccat_reader *reader = file->private_data;
	struct roccat_device *device = reader->device;
	struct roccat_report *report;
	ssize_t retval = 0, len;
	DECLARE_WAITQUEUE(wait, current);

	mutex_lock(&device->cbuf_lock);

	/* no data? */
	if (reader->cbuf_start == device->cbuf_end) {
		add_wait_queue(&device->wait, &wait);
		set_current_state(TASK_INTERRUPTIBLE);

		/* wait for data */
		while (reader->cbuf_start == device->cbuf_end) {
			if (file->f_flags & O_NONBLOCK) {
				retval = -EAGAIN;
				break;
			}
			if (signal_pending(current)) {
				retval = -ERESTARTSYS;
				break;
			}
			if (!device->exist) {
				retval = -EIO;
				break;
			}

			mutex_unlock(&device->cbuf_lock);
			schedule();
			mutex_lock(&device->cbuf_lock);
			set_current_state(TASK_INTERRUPTIBLE);
		}

		set_current_state(TASK_RUNNING);
		remove_wait_queue(&device->wait, &wait);
	}

	/* here we either have data or a reason to return if retval is set */
	if (retval)
		goto exit_unlock;

	report = &device->cbuf[reader->cbuf_start];
	/*
	 * If report is larger than requested amount of data, rest of report
	 * is lost!
	 */
	len = device->report_size > count ? count : device->report_size;

	if (copy_to_user(buffer, report->value, len)) {
		retval = -EFAULT;
		goto exit_unlock;
	}
	retval += len;
	reader->cbuf_start = (reader->cbuf_start + 1) % ROCCAT_CBUF_SIZE;

exit_unlock:
	mutex_unlock(&device->cbuf_lock);
	return retval;
}

static __poll_t roccat_poll(struct file *file, poll_table *wait)
{
	struct roccat_reader *reader = file->private_data;
	poll_wait(file, &reader->device->wait, wait);
	if (reader->cbuf_start != reader->device->cbuf_end)
		return EPOLLIN | EPOLLRDNORM;
	if (!reader->device->exist)
		return EPOLLERR | EPOLLHUP;
	return 0;
}

static int roccat_open(struct inode *inode, struct file *file)
{
	unsigned int minor = iminor(inode);
	struct roccat_reader *reader;
	struct roccat_device *device;
	int error = 0;

	reader = kzalloc(sizeof(struct roccat_reader), GFP_KERNEL);
	if (!reader)
		return -ENOMEM;

	mutex_lock(&devices_lock);

	device = devices[minor];

	if (!device) {
		pr_emerg("roccat device with minor %d doesn't exist\n", minor);
		error = -ENODEV;
		goto exit_err_devices;
	}

	mutex_lock(&device->readers_lock);

	if (!device->open++) {
		/* power on device on adding first reader */
		error = hid_hw_power(device->hid, PM_HINT_FULLON);
		if (error < 0) {
			--device->open;
			goto exit_err_readers;
		}

		error = hid_hw_open(device->hid);
		if (error < 0) {
			hid_hw_power(device->hid, PM_HINT_NORMAL);
			--device->open;
			goto exit_err_readers;
		}
	}

	reader->device = device;
	/* new reader doesn't get old events */
	reader->cbuf_start = device->cbuf_end;

	list_add_tail(&reader->node, &device->readers);
	file->private_data = reader;

exit_err_readers:
	mutex_unlock(&device->readers_lock);
exit_err_devices:
	mutex_unlock(&devices_lock);
	if (error)
		kfree(reader);
	return error;
}

static int roccat_release(struct inode *inode, struct file *file)
{
	unsigned int minor = iminor(inode);
	struct roccat_reader *reader = file->private_data;
	struct roccat_device *device;

	mutex_lock(&devices_lock);

	device = devices[minor];
	if (!device) {
		mutex_unlock(&devices_lock);
		pr_emerg("roccat device with minor %d doesn't exist\n", minor);
		return -ENODEV;
	}

	mutex_lock(&device->readers_lock);
	list_del(&reader->node);
	mutex_unlock(&device->readers_lock);
	kfree(reader);

	if (!--device->open) {
		/* removing last reader */
		if (device->exist) {
			hid_hw_power(device->hid, PM_HINT_NORMAL);
			hid_hw_close(device->hid);
		} else {
			kfree(device);
		}
	}

	mutex_unlock(&devices_lock);

	return 0;
}

/*
 * roccat_report_event() - output data to readers
 * @minor: minor device number returned by roccat_connect()
 * @data: pointer to data
 *
 * Return value is zero on success, a negative error code on failure.
 *
 * This is called from interrupt handler.
 */
int roccat_report_event(int minor, u8 const *data)
{
	struct roccat_device *device;
	struct roccat_reader *reader;
	struct roccat_report *report;
	uint8_t *new_value;

	device = devices[minor];

	new_value = kmemdup(data, device->report_size, GFP_ATOMIC);
	if (!new_value)
		return -ENOMEM;

	report = &device->cbuf[device->cbuf_end];

	/* passing NULL is safe */
	kfree(report->value);

	report->value = new_value;
	device->cbuf_end = (device->cbuf_end + 1) % ROCCAT_CBUF_SIZE;

	list_for_each_entry(reader, &device->readers, node) {
		/*
		 * As we already inserted one element, the buffer can't be
		 * empty. If start and end are equal, buffer is full and we
		 * increase start, so that slow reader misses one event, but
		 * gets the newer ones in the right order.
		 */
		if (reader->cbuf_start == device->cbuf_end)
			reader->cbuf_start = (reader->cbuf_start + 1) % ROCCAT_CBUF_SIZE;
	}

	wake_up_interruptible(&device->wait);
	return 0;
}
EXPORT_SYMBOL_GPL(roccat_report_event);

/*
 * roccat_connect() - create a char device for special event output
 * @class: the class thats used to create the device. Meant to hold device
 * specific sysfs attributes.
 * @hid: the hid device the char device should be connected to.
 * @report_size: size of reports
 *
 * Return value is minor device number in Range [0, ROCCAT_MAX_DEVICES] on
 * success, a negative error code on failure.
 */
int roccat_connect(struct class *klass, struct hid_device *hid, int report_size)
{
	unsigned int minor;
	struct roccat_device *device;
	int temp;

	device = kzalloc(sizeof(struct roccat_device), GFP_KERNEL);
	if (!device)
		return -ENOMEM;

	mutex_lock(&devices_lock);

	for (minor = 0; minor < ROCCAT_MAX_DEVICES; ++minor) {
		if (devices[minor])
			continue;
		break;
	}

	if (minor < ROCCAT_MAX_DEVICES) {
		devices[minor] = device;
	} else {
		mutex_unlock(&devices_lock);
		kfree(device);
		return -EINVAL;
	}

	device->dev = device_create(klass, &hid->dev,
			MKDEV(roccat_major, minor), NULL,
			"%s%s%d", "roccat", hid->driver->name, minor);

	if (IS_ERR(device->dev)) {
		devices[minor] = NULL;
		mutex_unlock(&devices_lock);
		temp = PTR_ERR(device->dev);
		kfree(device);
		return temp;
	}

	mutex_unlock(&devices_lock);

	init_waitqueue_head(&device->wait);
	INIT_LIST_HEAD(&device->readers);
	mutex_init(&device->readers_lock);
	mutex_init(&device->cbuf_lock);
	device->minor = minor;
	device->hid = hid;
	device->exist = 1;
	device->cbuf_end = 0;
	device->report_size = report_size;

	return minor;
}
EXPORT_SYMBOL_GPL(roccat_connect);

/* roccat_disconnect() - remove char device from hid device
 * @minor: the minor device number returned by roccat_connect()
 */
void roccat_disconnect(int minor)
{
	struct roccat_device *device;

	mutex_lock(&devices_lock);
	device = devices[minor];
	mutex_unlock(&devices_lock);

	device->exist = 0; /* TODO exist maybe not needed */

	device_destroy(device->dev->class, MKDEV(roccat_major, minor));

	mutex_lock(&devices_lock);
	devices[minor] = NULL;
	mutex_unlock(&devices_lock);

	if (device->open) {
		hid_hw_close(device->hid);
		wake_up_interruptible(&device->wait);
	} else {
		kfree(device);
	}
}
EXPORT_SYMBOL_GPL(roccat_disconnect);

static long roccat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
	struct inode *inode = file_inode(file);
	struct roccat_device *device;
	unsigned int minor = iminor(inode);
	long retval = 0;

	mutex_lock(&devices_lock);

	device = devices[minor];
	if (!device) {
		retval = -ENODEV;
		goto out;
	}

	switch (cmd) {
	case ROCCATIOCGREPSIZE:
		if (put_user(device->report_size, (int __user *)arg))
			retval = -EFAULT;
		break;
	default:
		retval = -ENOTTY;
	}
out:
	mutex_unlock(&devices_lock);
	return retval;
}

static const struct file_operations roccat_ops = {
	.owner = THIS_MODULE,
	.read = roccat_read,
	.poll = roccat_poll,
	.open = roccat_open,
	.release = roccat_release,
	.llseek = noop_llseek,
	.unlocked_ioctl = roccat_ioctl,
};

static int __init roccat_init(void)
{
	int retval;
	dev_t dev_id;

	retval = alloc_chrdev_region(&dev_id, ROCCAT_FIRST_MINOR,
			ROCCAT_MAX_DEVICES, "roccat");
	if (retval < 0) {
		pr_warn("can't get major number\n");
		goto error;
	}

	roccat_major = MAJOR(dev_id);

	cdev_init(&roccat_cdev, &roccat_ops);
	retval = cdev_add(&roccat_cdev, dev_id, ROCCAT_MAX_DEVICES);

	if (retval < 0) {
		pr_warn("cannot add cdev\n");
		goto cleanup_alloc_chrdev_region;
	}
	return 0;


 cleanup_alloc_chrdev_region:
	unregister_chrdev_region(dev_id, ROCCAT_MAX_DEVICES);
 error:
	return retval;
}

static void __exit roccat_exit(void)
{
	dev_t dev_id = MKDEV(roccat_major, 0);

	cdev_del(&roccat_cdev);
	unregister_chrdev_region(dev_id, ROCCAT_MAX_DEVICES);
}

module_init(roccat_init);
module_exit(roccat_exit);

MODULE_AUTHOR("Stefan Achatz");
MODULE_DESCRIPTION("USB Roccat char device");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
206f5f2f SA	1	/*
	2	* Roccat driver for Linux
	3	*
	4	* Copyright (c) 2010 Stefan Achatz <[email protected]>
	5	*/
	6
	7	/*
	8	* This program is free software; you can redistribute it and/or modify it
	9	* under the terms of the GNU General Public License as published by the Free
	10	* Software Foundation; either version 2 of the License, or (at your option)
	11	* any later version.
	12	*/
	13
	14	/*
	15	* Module roccat is a char device used to report special events of roccat
	16	* hardware to userland. These events include requests for on-screen-display of
	17	* profile or dpi settings or requests for execution of macro sequences that are
	18	* not stored in device. The information in these events depends on hid device
	19	* implementation and contains data that is not available in a single hid event
	20	* or else hidraw could have been used.
	21	* It is inspired by hidraw, but uses only one circular buffer for all readers.
	22	*/
	23
4291ee30 JP	24	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
4291ee30 JP	25
206f5f2f SA	26	#include <linux/cdev.h>
206f5f2f SA	27	#include <linux/poll.h>
174cd4b1	28	#include <linux/sched/signal.h>
5dc0c983	29	#include <linux/hid-roccat.h>
8f86a2c3	30	#include <linux/module.h>
206f5f2f SA	31
	32	#define ROCCAT_FIRST_MINOR 0
	33	#define ROCCAT_MAX_DEVICES 8
	34
	35	/* should be a power of 2 for performance reason */
	36	#define ROCCAT_CBUF_SIZE 16
	37
	38	struct roccat_report {
	39	uint8_t *value;
206f5f2f SA	40	};
	41
	42	struct roccat_device {
	43	unsigned int minor;
8211e460	44	int report_size;
206f5f2f SA	45	int open;
	46	int exist;
	47	wait_queue_head_t wait;
	48	struct device *dev;
	49	struct hid_device *hid;
	50	struct list_head readers;
	51	/* protects modifications of readers list */
	52	struct mutex readers_lock;
	53
	54	/*
	55	* circular_buffer has one writer and multiple readers with their own
	56	* read pointers
	57	*/
	58	struct roccat_report cbuf[ROCCAT_CBUF_SIZE];
	59	int cbuf_end;
	60	struct mutex cbuf_lock;
	61	};
	62
	63	struct roccat_reader {
	64	struct list_head node;
	65	struct roccat_device *device;
	66	int cbuf_start;
	67	};
	68
	69	static int roccat_major;
206f5f2f SA	70	static struct cdev roccat_cdev;
	71
	72	static struct roccat_device *devices[ROCCAT_MAX_DEVICES];
	73	/* protects modifications of devices array */
	74	static DEFINE_MUTEX(devices_lock);
	75
	76	static ssize_t roccat_read(struct file file, char __user buffer,
	77	size_t count, loff_t *ppos)
	78	{
	79	struct roccat_reader *reader = file->private_data;
	80	struct roccat_device *device = reader->device;
	81	struct roccat_report *report;
	82	ssize_t retval = 0, len;
	83	DECLARE_WAITQUEUE(wait, current);
	84
	85	mutex_lock(&device->cbuf_lock);
	86
	87	/* no data? */
	88	if (reader->cbuf_start == device->cbuf_end) {
	89	add_wait_queue(&device->wait, &wait);
	90	set_current_state(TASK_INTERRUPTIBLE);
	91
	92	/* wait for data */
	93	while (reader->cbuf_start == device->cbuf_end) {
	94	if (file->f_flags & O_NONBLOCK) {
	95	retval = -EAGAIN;
	96	break;
	97	}
	98	if (signal_pending(current)) {
	99	retval = -ERESTARTSYS;
	100	break;
	101	}
	102	if (!device->exist) {
	103	retval = -EIO;
	104	break;
	105	}
	106
	107	mutex_unlock(&device->cbuf_lock);
	108	schedule();
	109	mutex_lock(&device->cbuf_lock);
	110	set_current_state(TASK_INTERRUPTIBLE);
	111	}
	112
	113	set_current_state(TASK_RUNNING);
	114	remove_wait_queue(&device->wait, &wait);
	115	}
	116
	117	/* here we either have data or a reason to return if retval is set */
	118	if (retval)
	119	goto exit_unlock;
	120
	121	report = &device->cbuf[reader->cbuf_start];
	122	/*
	123	* If report is larger than requested amount of data, rest of report
	124	* is lost!
	125	*/
8211e460	126	len = device->report_size > count ? count : device->report_size;
206f5f2f SA	127
	128	if (copy_to_user(buffer, report->value, len)) {
	129	retval = -EFAULT;
	130	goto exit_unlock;
	131	}
	132	retval += len;
	133	reader->cbuf_start = (reader->cbuf_start + 1) % ROCCAT_CBUF_SIZE;
	134
	135	exit_unlock:
	136	mutex_unlock(&device->cbuf_lock);
	137	return retval;
	138	}
	139
afc9a42b	140	static __poll_t roccat_poll(struct file file, poll_table wait)
206f5f2f SA	141	{
	142	struct roccat_reader *reader = file->private_data;
	143	poll_wait(file, &reader->device->wait, wait);
	144	if (reader->cbuf_start != reader->device->cbuf_end)
a9a08845	145	return EPOLLIN \| EPOLLRDNORM;
206f5f2f	146	if (!reader->device->exist)
a9a08845	147	return EPOLLERR \| EPOLLHUP;
206f5f2f SA	148	return 0;
	149	}
	150
	151	static int roccat_open(struct inode inode, struct file file)
	152	{
	153	unsigned int minor = iminor(inode);
	154	struct roccat_reader *reader;
	155	struct roccat_device *device;
	156	int error = 0;
	157
	158	reader = kzalloc(sizeof(struct roccat_reader), GFP_KERNEL);
	159	if (!reader)
	160	return -ENOMEM;
	161
	162	mutex_lock(&devices_lock);
	163
	164	device = devices[minor];
	165
206f5f2f	166	if (!device) {
4291ee30	167	pr_emerg("roccat device with minor %d doesn't exist\n", minor);
206f5f2f	168	error = -ENODEV;
8052ee5f	169	goto exit_err_devices;
206f5f2f SA	170	}
206f5f2f SA	171
8052ee5f JL	172	mutex_lock(&device->readers_lock);
8052ee5f JL	173
206f5f2f SA	174	if (!device->open++) {
206f5f2f SA	175	/* power on device on adding first reader */
5bea7660 DT	176	error = hid_hw_power(device->hid, PM_HINT_FULLON);
	177	if (error < 0) {
	178	--device->open;
8052ee5f	179	goto exit_err_readers;
206f5f2f	180	}
5bea7660 DT	181
5bea7660 DT	182	error = hid_hw_open(device->hid);
206f5f2f	183	if (error < 0) {
5bea7660	184	hid_hw_power(device->hid, PM_HINT_NORMAL);
206f5f2f	185	--device->open;
8052ee5f	186	goto exit_err_readers;
206f5f2f SA	187	}
	188	}
	189
	190	reader->device = device;
	191	/* new reader doesn't get old events */
	192	reader->cbuf_start = device->cbuf_end;
	193
	194	list_add_tail(&reader->node, &device->readers);
	195	file->private_data = reader;
	196
8052ee5f	197	exit_err_readers:
206f5f2f	198	mutex_unlock(&device->readers_lock);
8052ee5f	199	exit_err_devices:
206f5f2f	200	mutex_unlock(&devices_lock);
8052ee5f JL	201	if (error)
8052ee5f JL	202	kfree(reader);
206f5f2f SA	203	return error;
	204	}
	205
	206	static int roccat_release(struct inode inode, struct file file)
	207	{
	208	unsigned int minor = iminor(inode);
	209	struct roccat_reader *reader = file->private_data;
	210	struct roccat_device *device;
	211
	212	mutex_lock(&devices_lock);
	213
	214	device = devices[minor];
	215	if (!device) {
	216	mutex_unlock(&devices_lock);
4291ee30	217	pr_emerg("roccat device with minor %d doesn't exist\n", minor);
206f5f2f SA	218	return -ENODEV;
	219	}
	220
	221	mutex_lock(&device->readers_lock);
	222	list_del(&reader->node);
	223	mutex_unlock(&device->readers_lock);
	224	kfree(reader);
	225
	226	if (!--device->open) {
	227	/* removing last reader */
	228	if (device->exist) {
5bea7660 DT	229	hid_hw_power(device->hid, PM_HINT_NORMAL);
5bea7660 DT	230	hid_hw_close(device->hid);
206f5f2f SA	231	} else {
	232	kfree(device);
	233	}
	234	}
	235
	236	mutex_unlock(&devices_lock);
	237
	238	return 0;
	239	}
	240
	241	/*
	242	* roccat_report_event() - output data to readers
	243	* @minor: minor device number returned by roccat_connect()
	244	* @data: pointer to data
206f5f2f SA	245	*
	246	* Return value is zero on success, a negative error code on failure.
	247	*
	248	* This is called from interrupt handler.
	249	*/
8211e460	250	int roccat_report_event(int minor, u8 const *data)
206f5f2f SA	251	{
	252	struct roccat_device *device;
	253	struct roccat_reader *reader;
	254	struct roccat_report *report;
	255	uint8_t *new_value;
	256
8211e460 SA	257	device = devices[minor];
	258
	259	new_value = kmemdup(data, device->report_size, GFP_ATOMIC);
206f5f2f SA	260	if (!new_value)
	261	return -ENOMEM;
	262
206f5f2f SA	263	report = &device->cbuf[device->cbuf_end];
	264
	265	/* passing NULL is safe */
	266	kfree(report->value);
	267
	268	report->value = new_value;
206f5f2f SA	269	device->cbuf_end = (device->cbuf_end + 1) % ROCCAT_CBUF_SIZE;
	270
	271	list_for_each_entry(reader, &device->readers, node) {
	272	/*
	273	* As we already inserted one element, the buffer can't be
	274	* empty. If start and end are equal, buffer is full and we
	275	* increase start, so that slow reader misses one event, but
	276	* gets the newer ones in the right order.
	277	*/
	278	if (reader->cbuf_start == device->cbuf_end)
	279	reader->cbuf_start = (reader->cbuf_start + 1) % ROCCAT_CBUF_SIZE;
	280	}
	281
	282	wake_up_interruptible(&device->wait);
	283	return 0;
	284	}
	285	EXPORT_SYMBOL_GPL(roccat_report_event);
	286
	287	/*
	288	* roccat_connect() - create a char device for special event output
5012aada SA	289	* @class: the class thats used to create the device. Meant to hold device
5012aada SA	290	* specific sysfs attributes.
206f5f2f	291	* @hid: the hid device the char device should be connected to.
02060045	292	* @report_size: size of reports
206f5f2f SA	293	*
	294	* Return value is minor device number in Range [0, ROCCAT_MAX_DEVICES] on
	295	* success, a negative error code on failure.
	296	*/
8211e460	297	int roccat_connect(struct class klass, struct hid_device hid, int report_size)
206f5f2f SA	298	{
	299	unsigned int minor;
	300	struct roccat_device *device;
	301	int temp;
	302
	303	device = kzalloc(sizeof(struct roccat_device), GFP_KERNEL);
	304	if (!device)
	305	return -ENOMEM;
	306
	307	mutex_lock(&devices_lock);
	308
	309	for (minor = 0; minor < ROCCAT_MAX_DEVICES; ++minor) {
	310	if (devices[minor])
	311	continue;
	312	break;
	313	}
	314
	315	if (minor < ROCCAT_MAX_DEVICES) {
	316	devices[minor] = device;
	317	} else {
	318	mutex_unlock(&devices_lock);
	319	kfree(device);
	320	return -EINVAL;
	321	}
	322
5012aada	323	device->dev = device_create(klass, &hid->dev,
206f5f2f SA	324	MKDEV(roccat_major, minor), NULL,
	325	"%s%s%d", "roccat", hid->driver->name, minor);
	326
	327	if (IS_ERR(device->dev)) {
	328	devices[minor] = NULL;
	329	mutex_unlock(&devices_lock);
	330	temp = PTR_ERR(device->dev);
	331	kfree(device);
	332	return temp;
	333	}
	334
	335	mutex_unlock(&devices_lock);
	336
	337	init_waitqueue_head(&device->wait);
	338	INIT_LIST_HEAD(&device->readers);
	339	mutex_init(&device->readers_lock);
	340	mutex_init(&device->cbuf_lock);
	341	device->minor = minor;
	342	device->hid = hid;
	343	device->exist = 1;
	344	device->cbuf_end = 0;
8211e460	345	device->report_size = report_size;
206f5f2f SA	346
	347	return minor;
	348	}
	349	EXPORT_SYMBOL_GPL(roccat_connect);
	350
	351	/* roccat_disconnect() - remove char device from hid device
	352	* @minor: the minor device number returned by roccat_connect()
	353	*/
	354	void roccat_disconnect(int minor)
	355	{
	356	struct roccat_device *device;
	357
	358	mutex_lock(&devices_lock);
	359	device = devices[minor];
206f5f2f SA	360	mutex_unlock(&devices_lock);
	361
	362	device->exist = 0; /* TODO exist maybe not needed */
	363
5012aada	364	device_destroy(device->dev->class, MKDEV(roccat_major, minor));
206f5f2f	365
e6fa47af SA	366	mutex_lock(&devices_lock);
	367	devices[minor] = NULL;
	368	mutex_unlock(&devices_lock);
a0be10c2	369
206f5f2f	370	if (device->open) {
5bea7660	371	hid_hw_close(device->hid);
206f5f2f SA	372	wake_up_interruptible(&device->wait);
	373	} else {
	374	kfree(device);
	375	}
	376	}
	377	EXPORT_SYMBOL_GPL(roccat_disconnect);
	378
8211e460 SA	379	static long roccat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
8211e460 SA	380	{
496ad9aa	381	struct inode *inode = file_inode(file);
8211e460 SA	382	struct roccat_device *device;
	383	unsigned int minor = iminor(inode);
	384	long retval = 0;
	385
	386	mutex_lock(&devices_lock);
	387
	388	device = devices[minor];
	389	if (!device) {
	390	retval = -ENODEV;
	391	goto out;
	392	}
	393
	394	switch (cmd) {
	395	case ROCCATIOCGREPSIZE:
	396	if (put_user(device->report_size, (int __user *)arg))
	397	retval = -EFAULT;
	398	break;
	399	default:
	400	retval = -ENOTTY;
	401	}
	402	out:
	403	mutex_unlock(&devices_lock);
	404	return retval;
	405	}
	406
206f5f2f SA	407	static const struct file_operations roccat_ops = {
	408	.owner = THIS_MODULE,
	409	.read = roccat_read,
	410	.poll = roccat_poll,
	411	.open = roccat_open,
	412	.release = roccat_release,
6038f373	413	.llseek = noop_llseek,
8211e460	414	.unlocked_ioctl = roccat_ioctl,
206f5f2f SA	415	};
	416
	417	static int __init roccat_init(void)
	418	{
	419	int retval;
	420	dev_t dev_id;
	421
	422	retval = alloc_chrdev_region(&dev_id, ROCCAT_FIRST_MINOR,
	423	ROCCAT_MAX_DEVICES, "roccat");
206f5f2f	424	if (retval < 0) {
4291ee30	425	pr_warn("can't get major number\n");
a0be10c2	426	goto error;
206f5f2f SA	427	}
206f5f2f SA	428
85d08340 DC	429	roccat_major = MAJOR(dev_id);
85d08340 DC	430
206f5f2f	431	cdev_init(&roccat_cdev, &roccat_ops);
a0be10c2	432	retval = cdev_add(&roccat_cdev, dev_id, ROCCAT_MAX_DEVICES);
206f5f2f	433
a0be10c2 MR	434	if (retval < 0) {
	435	pr_warn("cannot add cdev\n");
	436	goto cleanup_alloc_chrdev_region;
	437	}
206f5f2f	438	return 0;
a0be10c2 MR	439
	440
	441	cleanup_alloc_chrdev_region:
	442	unregister_chrdev_region(dev_id, ROCCAT_MAX_DEVICES);
	443	error:
	444	return retval;
206f5f2f SA	445	}
	446
	447	static void __exit roccat_exit(void)
	448	{
	449	dev_t dev_id = MKDEV(roccat_major, 0);
	450
	451	cdev_del(&roccat_cdev);
206f5f2f SA	452	unregister_chrdev_region(dev_id, ROCCAT_MAX_DEVICES);
	453	}
	454
	455	module_init(roccat_init);
	456	module_exit(roccat_exit);
	457
	458	MODULE_AUTHOR("Stefan Achatz");
	459	MODULE_DESCRIPTION("USB Roccat char device");
	460	MODULE_LICENSE("GPL v2");