[linux-2.6-block.git] / drivers / hid / hid-roccat.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Roccat driver for Linux
 *
 * Copyright (c) 2010 Stefan Achatz <erazor_de@users.sourceforge.net>
 */

/*
 */

/*
 * 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
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
206f5f2f SA	2	/*
	3	* Roccat driver for Linux
	4	*
	5	* Copyright (c) 2010 Stefan Achatz <erazor_de@users.sourceforge.net>
	6	*/
	7
	8	/*
206f5f2f SA	9	*/
	10
	11	/*
	12	* Module roccat is a char device used to report special events of roccat
	13	* hardware to userland. These events include requests for on-screen-display of
	14	* profile or dpi settings or requests for execution of macro sequences that are
	15	* not stored in device. The information in these events depends on hid device
	16	* implementation and contains data that is not available in a single hid event
	17	* or else hidraw could have been used.
	18	* It is inspired by hidraw, but uses only one circular buffer for all readers.
	19	*/
	20
4291ee30 JP	21	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
4291ee30 JP	22
206f5f2f SA	23	#include <linux/cdev.h>
206f5f2f SA	24	#include <linux/poll.h>
174cd4b1	25	#include <linux/sched/signal.h>
5dc0c983	26	#include <linux/hid-roccat.h>
8f86a2c3	27	#include <linux/module.h>
206f5f2f SA	28
	29	#define ROCCAT_FIRST_MINOR 0
	30	#define ROCCAT_MAX_DEVICES 8
	31
	32	/* should be a power of 2 for performance reason */
	33	#define ROCCAT_CBUF_SIZE 16
	34
	35	struct roccat_report {
	36	uint8_t *value;
206f5f2f SA	37	};
	38
	39	struct roccat_device {
	40	unsigned int minor;
8211e460	41	int report_size;
206f5f2f SA	42	int open;
	43	int exist;
	44	wait_queue_head_t wait;
	45	struct device *dev;
	46	struct hid_device *hid;
	47	struct list_head readers;
	48	/* protects modifications of readers list */
	49	struct mutex readers_lock;
	50
	51	/*
	52	* circular_buffer has one writer and multiple readers with their own
	53	* read pointers
	54	*/
	55	struct roccat_report cbuf[ROCCAT_CBUF_SIZE];
	56	int cbuf_end;
	57	struct mutex cbuf_lock;
	58	};
	59
	60	struct roccat_reader {
	61	struct list_head node;
	62	struct roccat_device *device;
	63	int cbuf_start;
	64	};
	65
	66	static int roccat_major;
206f5f2f SA	67	static struct cdev roccat_cdev;
	68
	69	static struct roccat_device *devices[ROCCAT_MAX_DEVICES];
	70	/* protects modifications of devices array */
	71	static DEFINE_MUTEX(devices_lock);
	72
	73	static ssize_t roccat_read(struct file file, char __user buffer,
	74	size_t count, loff_t *ppos)
	75	{
	76	struct roccat_reader *reader = file->private_data;
	77	struct roccat_device *device = reader->device;
	78	struct roccat_report *report;
	79	ssize_t retval = 0, len;
	80	DECLARE_WAITQUEUE(wait, current);
	81
	82	mutex_lock(&device->cbuf_lock);
	83
	84	/* no data? */
	85	if (reader->cbuf_start == device->cbuf_end) {
	86	add_wait_queue(&device->wait, &wait);
	87	set_current_state(TASK_INTERRUPTIBLE);
	88
	89	/* wait for data */
	90	while (reader->cbuf_start == device->cbuf_end) {
	91	if (file->f_flags & O_NONBLOCK) {
	92	retval = -EAGAIN;
	93	break;
	94	}
	95	if (signal_pending(current)) {
	96	retval = -ERESTARTSYS;
	97	break;
	98	}
	99	if (!device->exist) {
	100	retval = -EIO;
	101	break;
	102	}
	103
	104	mutex_unlock(&device->cbuf_lock);
	105	schedule();
	106	mutex_lock(&device->cbuf_lock);
	107	set_current_state(TASK_INTERRUPTIBLE);
	108	}
	109
	110	set_current_state(TASK_RUNNING);
	111	remove_wait_queue(&device->wait, &wait);
	112	}
	113
	114	/* here we either have data or a reason to return if retval is set */
	115	if (retval)
	116	goto exit_unlock;
	117
	118	report = &device->cbuf[reader->cbuf_start];
	119	/*
	120	* If report is larger than requested amount of data, rest of report
	121	* is lost!
	122	*/
8211e460	123	len = device->report_size > count ? count : device->report_size;
206f5f2f SA	124
	125	if (copy_to_user(buffer, report->value, len)) {
	126	retval = -EFAULT;
	127	goto exit_unlock;
	128	}
	129	retval += len;
	130	reader->cbuf_start = (reader->cbuf_start + 1) % ROCCAT_CBUF_SIZE;
	131
	132	exit_unlock:
	133	mutex_unlock(&device->cbuf_lock);
	134	return retval;
	135	}
	136
afc9a42b	137	static __poll_t roccat_poll(struct file file, poll_table wait)
206f5f2f SA	138	{
	139	struct roccat_reader *reader = file->private_data;
	140	poll_wait(file, &reader->device->wait, wait);
	141	if (reader->cbuf_start != reader->device->cbuf_end)
a9a08845	142	return EPOLLIN \| EPOLLRDNORM;
206f5f2f	143	if (!reader->device->exist)
a9a08845	144	return EPOLLERR \| EPOLLHUP;
206f5f2f SA	145	return 0;
	146	}
	147
	148	static int roccat_open(struct inode inode, struct file file)
	149	{
	150	unsigned int minor = iminor(inode);
	151	struct roccat_reader *reader;
	152	struct roccat_device *device;
	153	int error = 0;
	154
	155	reader = kzalloc(sizeof(struct roccat_reader), GFP_KERNEL);
	156	if (!reader)
	157	return -ENOMEM;
	158
	159	mutex_lock(&devices_lock);
	160
	161	device = devices[minor];
	162
206f5f2f	163	if (!device) {
4291ee30	164	pr_emerg("roccat device with minor %d doesn't exist\n", minor);
206f5f2f	165	error = -ENODEV;
8052ee5f	166	goto exit_err_devices;
206f5f2f SA	167	}
206f5f2f SA	168
8052ee5f JL	169	mutex_lock(&device->readers_lock);
8052ee5f JL	170
206f5f2f SA	171	if (!device->open++) {
206f5f2f SA	172	/* power on device on adding first reader */
5bea7660 DT	173	error = hid_hw_power(device->hid, PM_HINT_FULLON);
	174	if (error < 0) {
	175	--device->open;
8052ee5f	176	goto exit_err_readers;
206f5f2f	177	}
5bea7660 DT	178
5bea7660 DT	179	error = hid_hw_open(device->hid);
206f5f2f	180	if (error < 0) {
5bea7660	181	hid_hw_power(device->hid, PM_HINT_NORMAL);
206f5f2f	182	--device->open;
8052ee5f	183	goto exit_err_readers;
206f5f2f SA	184	}
	185	}
	186
	187	reader->device = device;
	188	/* new reader doesn't get old events */
	189	reader->cbuf_start = device->cbuf_end;
	190
	191	list_add_tail(&reader->node, &device->readers);
	192	file->private_data = reader;
	193
8052ee5f	194	exit_err_readers:
206f5f2f	195	mutex_unlock(&device->readers_lock);
8052ee5f	196	exit_err_devices:
206f5f2f	197	mutex_unlock(&devices_lock);
8052ee5f JL	198	if (error)
8052ee5f JL	199	kfree(reader);
206f5f2f SA	200	return error;
	201	}
	202
	203	static int roccat_release(struct inode inode, struct file file)
	204	{
	205	unsigned int minor = iminor(inode);
	206	struct roccat_reader *reader = file->private_data;
	207	struct roccat_device *device;
	208
	209	mutex_lock(&devices_lock);
	210
	211	device = devices[minor];
	212	if (!device) {
	213	mutex_unlock(&devices_lock);
4291ee30	214	pr_emerg("roccat device with minor %d doesn't exist\n", minor);
206f5f2f SA	215	return -ENODEV;
	216	}
	217
	218	mutex_lock(&device->readers_lock);
	219	list_del(&reader->node);
	220	mutex_unlock(&device->readers_lock);
	221	kfree(reader);
	222
	223	if (!--device->open) {
	224	/* removing last reader */
	225	if (device->exist) {
5bea7660 DT	226	hid_hw_power(device->hid, PM_HINT_NORMAL);
5bea7660 DT	227	hid_hw_close(device->hid);
206f5f2f SA	228	} else {
	229	kfree(device);
	230	}
	231	}
	232
	233	mutex_unlock(&devices_lock);
	234
	235	return 0;
	236	}
	237
	238	/*
	239	* roccat_report_event() - output data to readers
	240	* @minor: minor device number returned by roccat_connect()
	241	* @data: pointer to data
206f5f2f SA	242	*
	243	* Return value is zero on success, a negative error code on failure.
	244	*
	245	* This is called from interrupt handler.
	246	*/
8211e460	247	int roccat_report_event(int minor, u8 const *data)
206f5f2f SA	248	{
	249	struct roccat_device *device;
	250	struct roccat_reader *reader;
	251	struct roccat_report *report;
	252	uint8_t *new_value;
	253
8211e460 SA	254	device = devices[minor];
	255
	256	new_value = kmemdup(data, device->report_size, GFP_ATOMIC);
206f5f2f SA	257	if (!new_value)
	258	return -ENOMEM;
	259
206f5f2f SA	260	report = &device->cbuf[device->cbuf_end];
	261
	262	/* passing NULL is safe */
	263	kfree(report->value);
	264
	265	report->value = new_value;
206f5f2f SA	266	device->cbuf_end = (device->cbuf_end + 1) % ROCCAT_CBUF_SIZE;
	267
	268	list_for_each_entry(reader, &device->readers, node) {
	269	/*
	270	* As we already inserted one element, the buffer can't be
	271	* empty. If start and end are equal, buffer is full and we
	272	* increase start, so that slow reader misses one event, but
	273	* gets the newer ones in the right order.
	274	*/
	275	if (reader->cbuf_start == device->cbuf_end)
	276	reader->cbuf_start = (reader->cbuf_start + 1) % ROCCAT_CBUF_SIZE;
	277	}
	278
	279	wake_up_interruptible(&device->wait);
	280	return 0;
	281	}
	282	EXPORT_SYMBOL_GPL(roccat_report_event);
	283
	284	/*
	285	* roccat_connect() - create a char device for special event output
5012aada SA	286	* @class: the class thats used to create the device. Meant to hold device
5012aada SA	287	* specific sysfs attributes.
206f5f2f	288	* @hid: the hid device the char device should be connected to.
02060045	289	* @report_size: size of reports
206f5f2f SA	290	*
	291	* Return value is minor device number in Range [0, ROCCAT_MAX_DEVICES] on
	292	* success, a negative error code on failure.
	293	*/
8211e460	294	int roccat_connect(struct class klass, struct hid_device hid, int report_size)
206f5f2f SA	295	{
	296	unsigned int minor;
	297	struct roccat_device *device;
	298	int temp;
	299
	300	device = kzalloc(sizeof(struct roccat_device), GFP_KERNEL);
	301	if (!device)
	302	return -ENOMEM;
	303
	304	mutex_lock(&devices_lock);
	305
	306	for (minor = 0; minor < ROCCAT_MAX_DEVICES; ++minor) {
	307	if (devices[minor])
	308	continue;
	309	break;
	310	}
	311
	312	if (minor < ROCCAT_MAX_DEVICES) {
	313	devices[minor] = device;
	314	} else {
	315	mutex_unlock(&devices_lock);
	316	kfree(device);
	317	return -EINVAL;
	318	}
	319
5012aada	320	device->dev = device_create(klass, &hid->dev,
206f5f2f SA	321	MKDEV(roccat_major, minor), NULL,
	322	"%s%s%d", "roccat", hid->driver->name, minor);
	323
	324	if (IS_ERR(device->dev)) {
	325	devices[minor] = NULL;
	326	mutex_unlock(&devices_lock);
	327	temp = PTR_ERR(device->dev);
	328	kfree(device);
	329	return temp;
	330	}
	331
	332	mutex_unlock(&devices_lock);
	333
	334	init_waitqueue_head(&device->wait);
	335	INIT_LIST_HEAD(&device->readers);
	336	mutex_init(&device->readers_lock);
	337	mutex_init(&device->cbuf_lock);
	338	device->minor = minor;
	339	device->hid = hid;
	340	device->exist = 1;
	341	device->cbuf_end = 0;
8211e460	342	device->report_size = report_size;
206f5f2f SA	343
	344	return minor;
	345	}
	346	EXPORT_SYMBOL_GPL(roccat_connect);
	347
	348	/* roccat_disconnect() - remove char device from hid device
	349	* @minor: the minor device number returned by roccat_connect()
	350	*/
	351	void roccat_disconnect(int minor)
	352	{
	353	struct roccat_device *device;
	354
	355	mutex_lock(&devices_lock);
	356	device = devices[minor];
206f5f2f SA	357	mutex_unlock(&devices_lock);
	358
	359	device->exist = 0; /* TODO exist maybe not needed */
	360
5012aada	361	device_destroy(device->dev->class, MKDEV(roccat_major, minor));
206f5f2f	362
e6fa47af SA	363	mutex_lock(&devices_lock);
	364	devices[minor] = NULL;
	365	mutex_unlock(&devices_lock);
a0be10c2	366
206f5f2f	367	if (device->open) {
5bea7660	368	hid_hw_close(device->hid);
206f5f2f SA	369	wake_up_interruptible(&device->wait);
	370	} else {
	371	kfree(device);
	372	}
	373	}
	374	EXPORT_SYMBOL_GPL(roccat_disconnect);
	375
8211e460 SA	376	static long roccat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
8211e460 SA	377	{
496ad9aa	378	struct inode *inode = file_inode(file);
8211e460 SA	379	struct roccat_device *device;
	380	unsigned int minor = iminor(inode);
	381	long retval = 0;
	382
	383	mutex_lock(&devices_lock);
	384
	385	device = devices[minor];
	386	if (!device) {
	387	retval = -ENODEV;
	388	goto out;
	389	}
	390
	391	switch (cmd) {
	392	case ROCCATIOCGREPSIZE:
	393	if (put_user(device->report_size, (int __user *)arg))
	394	retval = -EFAULT;
	395	break;
	396	default:
	397	retval = -ENOTTY;
	398	}
	399	out:
	400	mutex_unlock(&devices_lock);
	401	return retval;
	402	}
	403
206f5f2f SA	404	static const struct file_operations roccat_ops = {
	405	.owner = THIS_MODULE,
	406	.read = roccat_read,
	407	.poll = roccat_poll,
	408	.open = roccat_open,
	409	.release = roccat_release,
6038f373	410	.llseek = noop_llseek,
8211e460	411	.unlocked_ioctl = roccat_ioctl,
206f5f2f SA	412	};
	413
	414	static int __init roccat_init(void)
	415	{
	416	int retval;
	417	dev_t dev_id;
	418
	419	retval = alloc_chrdev_region(&dev_id, ROCCAT_FIRST_MINOR,
	420	ROCCAT_MAX_DEVICES, "roccat");
206f5f2f	421	if (retval < 0) {
4291ee30	422	pr_warn("can't get major number\n");
a0be10c2	423	goto error;
206f5f2f SA	424	}
206f5f2f SA	425
85d08340 DC	426	roccat_major = MAJOR(dev_id);
85d08340 DC	427
206f5f2f	428	cdev_init(&roccat_cdev, &roccat_ops);
a0be10c2	429	retval = cdev_add(&roccat_cdev, dev_id, ROCCAT_MAX_DEVICES);
206f5f2f	430
a0be10c2 MR	431	if (retval < 0) {
	432	pr_warn("cannot add cdev\n");
	433	goto cleanup_alloc_chrdev_region;
	434	}
206f5f2f	435	return 0;
a0be10c2 MR	436
	437
	438	cleanup_alloc_chrdev_region:
	439	unregister_chrdev_region(dev_id, ROCCAT_MAX_DEVICES);
	440	error:
	441	return retval;
206f5f2f SA	442	}
	443
	444	static void __exit roccat_exit(void)
	445	{
	446	dev_t dev_id = MKDEV(roccat_major, 0);
	447
	448	cdev_del(&roccat_cdev);
206f5f2f SA	449	unregister_chrdev_region(dev_id, ROCCAT_MAX_DEVICES);
	450	}
	451
	452	module_init(roccat_init);
	453	module_exit(roccat_exit);
	454
	455	MODULE_AUTHOR("Stefan Achatz");
	456	MODULE_DESCRIPTION("USB Roccat char device");
	457	MODULE_LICENSE("GPL v2");