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v5.9
  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Driver for Meywa-Denki & KAYAC YUREX
  4 *
  5 * Copyright (C) 2010 Tomoki Sekiyama (tomoki.sekiyama@gmail.com)
  6 */
  7
  8#include <linux/kernel.h>
  9#include <linux/errno.h>
 10#include <linux/slab.h>
 11#include <linux/module.h>
 12#include <linux/kref.h>
 13#include <linux/mutex.h>
 14#include <linux/uaccess.h>
 15#include <linux/usb.h>
 16#include <linux/hid.h>
 17
 18#define DRIVER_AUTHOR "Tomoki Sekiyama"
 19#define DRIVER_DESC "Driver for Meywa-Denki & KAYAC YUREX"
 20
 21#define YUREX_VENDOR_ID		0x0c45
 22#define YUREX_PRODUCT_ID	0x1010
 23
 24#define CMD_ACK		'!'
 25#define CMD_ANIMATE	'A'
 26#define CMD_COUNT	'C'
 27#define CMD_LED		'L'
 28#define CMD_READ	'R'
 29#define CMD_SET		'S'
 30#define CMD_VERSION	'V'
 31#define CMD_EOF		0x0d
 32#define CMD_PADDING	0xff
 33
 34#define YUREX_BUF_SIZE		8
 35#define YUREX_WRITE_TIMEOUT	(HZ*2)
 36
 37/* table of devices that work with this driver */
 38static struct usb_device_id yurex_table[] = {
 39	{ USB_DEVICE(YUREX_VENDOR_ID, YUREX_PRODUCT_ID) },
 40	{ }					/* Terminating entry */
 41};
 42MODULE_DEVICE_TABLE(usb, yurex_table);
 43
 44#ifdef CONFIG_USB_DYNAMIC_MINORS
 45#define YUREX_MINOR_BASE	0
 46#else
 47#define YUREX_MINOR_BASE	192
 48#endif
 49
 50/* Structure to hold all of our device specific stuff */
 51struct usb_yurex {
 52	struct usb_device	*udev;
 53	struct usb_interface	*interface;
 54	__u8			int_in_endpointAddr;
 55	struct urb		*urb;		/* URB for interrupt in */
 56	unsigned char           *int_buffer;	/* buffer for intterupt in */
 57	struct urb		*cntl_urb;	/* URB for control msg */
 58	struct usb_ctrlrequest	*cntl_req;	/* req for control msg */
 59	unsigned char		*cntl_buffer;	/* buffer for control msg */
 60
 61	struct kref		kref;
 62	struct mutex		io_mutex;
 63	unsigned long		disconnected:1;
 64	struct fasync_struct	*async_queue;
 65	wait_queue_head_t	waitq;
 66
 67	spinlock_t		lock;
 68	__s64			bbu;		/* BBU from device */
 69};
 70#define to_yurex_dev(d) container_of(d, struct usb_yurex, kref)
 71
 72static struct usb_driver yurex_driver;
 73static const struct file_operations yurex_fops;
 74
 75
 76static void yurex_control_callback(struct urb *urb)
 77{
 78	struct usb_yurex *dev = urb->context;
 79	int status = urb->status;
 80
 81	if (status) {
 82		dev_err(&urb->dev->dev, "%s - control failed: %d\n",
 83			__func__, status);
 84		wake_up_interruptible(&dev->waitq);
 85		return;
 86	}
 87	/* on success, sender woken up by CMD_ACK int in, or timeout */
 88}
 89
 90static void yurex_delete(struct kref *kref)
 91{
 92	struct usb_yurex *dev = to_yurex_dev(kref);
 93
 94	dev_dbg(&dev->interface->dev, "%s\n", __func__);
 95
 
 96	if (dev->cntl_urb) {
 97		usb_kill_urb(dev->cntl_urb);
 98		kfree(dev->cntl_req);
 99		if (dev->cntl_buffer)
100			usb_free_coherent(dev->udev, YUREX_BUF_SIZE,
101				dev->cntl_buffer, dev->cntl_urb->transfer_dma);
102		usb_free_urb(dev->cntl_urb);
103	}
104	if (dev->urb) {
105		usb_kill_urb(dev->urb);
106		if (dev->int_buffer)
107			usb_free_coherent(dev->udev, YUREX_BUF_SIZE,
108				dev->int_buffer, dev->urb->transfer_dma);
109		usb_free_urb(dev->urb);
110	}
111	usb_put_intf(dev->interface);
112	usb_put_dev(dev->udev);
113	kfree(dev);
114}
115
116/*
117 * usb class driver info in order to get a minor number from the usb core,
118 * and to have the device registered with the driver core
119 */
120static struct usb_class_driver yurex_class = {
121	.name =		"yurex%d",
122	.fops =		&yurex_fops,
123	.minor_base =	YUREX_MINOR_BASE,
124};
125
126static void yurex_interrupt(struct urb *urb)
127{
128	struct usb_yurex *dev = urb->context;
129	unsigned char *buf = dev->int_buffer;
130	int status = urb->status;
131	unsigned long flags;
132	int retval, i;
133
134	switch (status) {
135	case 0: /*success*/
136		break;
137	/* The device is terminated or messed up, give up */
138	case -EOVERFLOW:
139		dev_err(&dev->interface->dev,
140			"%s - overflow with length %d, actual length is %d\n",
141			__func__, YUREX_BUF_SIZE, dev->urb->actual_length);
142	case -ECONNRESET:
143	case -ENOENT:
144	case -ESHUTDOWN:
145	case -EILSEQ:
146	case -EPROTO:
147	case -ETIME:
148		return;
149	default:
150		dev_err(&dev->interface->dev,
151			"%s - unknown status received: %d\n", __func__, status);
152		return;
153	}
154
155	/* handle received message */
156	switch (buf[0]) {
157	case CMD_COUNT:
158	case CMD_READ:
159		if (buf[6] == CMD_EOF) {
160			spin_lock_irqsave(&dev->lock, flags);
161			dev->bbu = 0;
162			for (i = 1; i < 6; i++) {
163				dev->bbu += buf[i];
164				if (i != 5)
165					dev->bbu <<= 8;
166			}
167			dev_dbg(&dev->interface->dev, "%s count: %lld\n",
168				__func__, dev->bbu);
169			spin_unlock_irqrestore(&dev->lock, flags);
170
171			kill_fasync(&dev->async_queue, SIGIO, POLL_IN);
172		}
173		else
174			dev_dbg(&dev->interface->dev,
175				"data format error - no EOF\n");
176		break;
177	case CMD_ACK:
178		dev_dbg(&dev->interface->dev, "%s ack: %c\n",
179			__func__, buf[1]);
180		wake_up_interruptible(&dev->waitq);
181		break;
182	}
183
 
184	retval = usb_submit_urb(dev->urb, GFP_ATOMIC);
185	if (retval) {
186		dev_err(&dev->interface->dev, "%s - usb_submit_urb failed: %d\n",
187			__func__, retval);
188	}
189}
190
191static int yurex_probe(struct usb_interface *interface, const struct usb_device_id *id)
192{
193	struct usb_yurex *dev;
194	struct usb_host_interface *iface_desc;
195	struct usb_endpoint_descriptor *endpoint;
196	int retval = -ENOMEM;
197	DEFINE_WAIT(wait);
198	int res;
199
200	/* allocate memory for our device state and initialize it */
201	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
202	if (!dev)
203		goto error;
204	kref_init(&dev->kref);
205	mutex_init(&dev->io_mutex);
206	spin_lock_init(&dev->lock);
207	init_waitqueue_head(&dev->waitq);
208
209	dev->udev = usb_get_dev(interface_to_usbdev(interface));
210	dev->interface = usb_get_intf(interface);
211
212	/* set up the endpoint information */
213	iface_desc = interface->cur_altsetting;
214	res = usb_find_int_in_endpoint(iface_desc, &endpoint);
215	if (res) {
216		dev_err(&interface->dev, "Could not find endpoints\n");
217		retval = res;
218		goto error;
219	}
220
221	dev->int_in_endpointAddr = endpoint->bEndpointAddress;
222
223	/* allocate control URB */
224	dev->cntl_urb = usb_alloc_urb(0, GFP_KERNEL);
225	if (!dev->cntl_urb)
226		goto error;
227
228	/* allocate buffer for control req */
229	dev->cntl_req = kmalloc(YUREX_BUF_SIZE, GFP_KERNEL);
230	if (!dev->cntl_req)
231		goto error;
232
233	/* allocate buffer for control msg */
234	dev->cntl_buffer = usb_alloc_coherent(dev->udev, YUREX_BUF_SIZE,
235					      GFP_KERNEL,
236					      &dev->cntl_urb->transfer_dma);
237	if (!dev->cntl_buffer) {
238		dev_err(&interface->dev, "Could not allocate cntl_buffer\n");
239		goto error;
240	}
241
242	/* configure control URB */
243	dev->cntl_req->bRequestType = USB_DIR_OUT | USB_TYPE_CLASS |
244				      USB_RECIP_INTERFACE;
245	dev->cntl_req->bRequest	= HID_REQ_SET_REPORT;
246	dev->cntl_req->wValue	= cpu_to_le16((HID_OUTPUT_REPORT + 1) << 8);
247	dev->cntl_req->wIndex	= cpu_to_le16(iface_desc->desc.bInterfaceNumber);
248	dev->cntl_req->wLength	= cpu_to_le16(YUREX_BUF_SIZE);
249
250	usb_fill_control_urb(dev->cntl_urb, dev->udev,
251			     usb_sndctrlpipe(dev->udev, 0),
252			     (void *)dev->cntl_req, dev->cntl_buffer,
253			     YUREX_BUF_SIZE, yurex_control_callback, dev);
254	dev->cntl_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
255
256
257	/* allocate interrupt URB */
258	dev->urb = usb_alloc_urb(0, GFP_KERNEL);
259	if (!dev->urb)
260		goto error;
261
262	/* allocate buffer for interrupt in */
263	dev->int_buffer = usb_alloc_coherent(dev->udev, YUREX_BUF_SIZE,
264					GFP_KERNEL, &dev->urb->transfer_dma);
265	if (!dev->int_buffer) {
266		dev_err(&interface->dev, "Could not allocate int_buffer\n");
267		goto error;
268	}
269
270	/* configure interrupt URB */
271	usb_fill_int_urb(dev->urb, dev->udev,
272			 usb_rcvintpipe(dev->udev, dev->int_in_endpointAddr),
273			 dev->int_buffer, YUREX_BUF_SIZE, yurex_interrupt,
274			 dev, 1);
275	dev->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
276	if (usb_submit_urb(dev->urb, GFP_KERNEL)) {
277		retval = -EIO;
278		dev_err(&interface->dev, "Could not submitting URB\n");
279		goto error;
280	}
281
282	/* save our data pointer in this interface device */
283	usb_set_intfdata(interface, dev);
284	dev->bbu = -1;
285
286	/* we can register the device now, as it is ready */
287	retval = usb_register_dev(interface, &yurex_class);
288	if (retval) {
289		dev_err(&interface->dev,
290			"Not able to get a minor for this device.\n");
291		usb_set_intfdata(interface, NULL);
292		goto error;
293	}
294
295	dev_info(&interface->dev,
296		 "USB YUREX device now attached to Yurex #%d\n",
297		 interface->minor);
298
299	return 0;
300
301error:
302	if (dev)
303		/* this frees allocated memory */
304		kref_put(&dev->kref, yurex_delete);
305	return retval;
306}
307
308static void yurex_disconnect(struct usb_interface *interface)
309{
310	struct usb_yurex *dev;
311	int minor = interface->minor;
312
313	dev = usb_get_intfdata(interface);
314	usb_set_intfdata(interface, NULL);
315
316	/* give back our minor */
317	usb_deregister_dev(interface, &yurex_class);
318
319	/* prevent more I/O from starting */
320	usb_poison_urb(dev->urb);
321	usb_poison_urb(dev->cntl_urb);
322	mutex_lock(&dev->io_mutex);
323	dev->disconnected = 1;
324	mutex_unlock(&dev->io_mutex);
325
326	/* wakeup waiters */
327	kill_fasync(&dev->async_queue, SIGIO, POLL_IN);
328	wake_up_interruptible(&dev->waitq);
329
330	/* decrement our usage count */
331	kref_put(&dev->kref, yurex_delete);
332
333	dev_info(&interface->dev, "USB YUREX #%d now disconnected\n", minor);
334}
335
336static struct usb_driver yurex_driver = {
337	.name =		"yurex",
338	.probe =	yurex_probe,
339	.disconnect =	yurex_disconnect,
340	.id_table =	yurex_table,
341};
342
343
344static int yurex_fasync(int fd, struct file *file, int on)
345{
346	struct usb_yurex *dev;
347
348	dev = file->private_data;
349	return fasync_helper(fd, file, on, &dev->async_queue);
350}
351
352static int yurex_open(struct inode *inode, struct file *file)
353{
354	struct usb_yurex *dev;
355	struct usb_interface *interface;
356	int subminor;
357	int retval = 0;
358
359	subminor = iminor(inode);
360
361	interface = usb_find_interface(&yurex_driver, subminor);
362	if (!interface) {
363		printk(KERN_ERR "%s - error, can't find device for minor %d",
364		       __func__, subminor);
365		retval = -ENODEV;
366		goto exit;
367	}
368
369	dev = usb_get_intfdata(interface);
370	if (!dev) {
371		retval = -ENODEV;
372		goto exit;
373	}
374
375	/* increment our usage count for the device */
376	kref_get(&dev->kref);
377
378	/* save our object in the file's private structure */
379	mutex_lock(&dev->io_mutex);
380	file->private_data = dev;
381	mutex_unlock(&dev->io_mutex);
382
383exit:
384	return retval;
385}
386
387static int yurex_release(struct inode *inode, struct file *file)
388{
389	struct usb_yurex *dev;
390
391	dev = file->private_data;
392	if (dev == NULL)
393		return -ENODEV;
394
395	/* decrement the count on our device */
396	kref_put(&dev->kref, yurex_delete);
397	return 0;
398}
399
400static ssize_t yurex_read(struct file *file, char __user *buffer, size_t count,
401			  loff_t *ppos)
402{
403	struct usb_yurex *dev;
404	int len = 0;
 
405	char in_buffer[20];
406	unsigned long flags;
407
408	dev = file->private_data;
409
410	mutex_lock(&dev->io_mutex);
411	if (dev->disconnected) {		/* already disconnected */
412		mutex_unlock(&dev->io_mutex);
413		return -ENODEV;
414	}
415
416	spin_lock_irqsave(&dev->lock, flags);
417	len = snprintf(in_buffer, 20, "%lld\n", dev->bbu);
418	spin_unlock_irqrestore(&dev->lock, flags);
419	mutex_unlock(&dev->io_mutex);
420
421	if (WARN_ON_ONCE(len >= sizeof(in_buffer)))
422		return -EIO;
 
 
 
 
 
 
423
424	return simple_read_from_buffer(buffer, count, ppos, in_buffer, len);
 
 
425}
426
427static ssize_t yurex_write(struct file *file, const char __user *user_buffer,
428			   size_t count, loff_t *ppos)
429{
430	struct usb_yurex *dev;
431	int i, set = 0, retval = 0;
432	char buffer[16 + 1];
433	char *data = buffer;
434	unsigned long long c, c2 = 0;
435	signed long timeout = 0;
436	DEFINE_WAIT(wait);
437
438	count = min(sizeof(buffer) - 1, count);
439	dev = file->private_data;
440
441	/* verify that we actually have some data to write */
442	if (count == 0)
443		goto error;
444
445	mutex_lock(&dev->io_mutex);
446	if (dev->disconnected) {		/* already disconnected */
447		mutex_unlock(&dev->io_mutex);
448		retval = -ENODEV;
449		goto error;
450	}
451
452	if (copy_from_user(buffer, user_buffer, count)) {
453		mutex_unlock(&dev->io_mutex);
454		retval = -EFAULT;
455		goto error;
456	}
457	buffer[count] = 0;
458	memset(dev->cntl_buffer, CMD_PADDING, YUREX_BUF_SIZE);
459
460	switch (buffer[0]) {
461	case CMD_ANIMATE:
462	case CMD_LED:
463		dev->cntl_buffer[0] = buffer[0];
464		dev->cntl_buffer[1] = buffer[1];
465		dev->cntl_buffer[2] = CMD_EOF;
466		break;
467	case CMD_READ:
468	case CMD_VERSION:
469		dev->cntl_buffer[0] = buffer[0];
470		dev->cntl_buffer[1] = 0x00;
471		dev->cntl_buffer[2] = CMD_EOF;
472		break;
473	case CMD_SET:
474		data++;
475		fallthrough;
476	case '0' ... '9':
477		set = 1;
478		c = c2 = simple_strtoull(data, NULL, 0);
479		dev->cntl_buffer[0] = CMD_SET;
480		for (i = 1; i < 6; i++) {
481			dev->cntl_buffer[i] = (c>>32) & 0xff;
482			c <<= 8;
483		}
484		buffer[6] = CMD_EOF;
485		break;
486	default:
487		mutex_unlock(&dev->io_mutex);
488		return -EINVAL;
489	}
490
491	/* send the data as the control msg */
492	prepare_to_wait(&dev->waitq, &wait, TASK_INTERRUPTIBLE);
493	dev_dbg(&dev->interface->dev, "%s - submit %c\n", __func__,
494		dev->cntl_buffer[0]);
495	retval = usb_submit_urb(dev->cntl_urb, GFP_ATOMIC);
496	if (retval >= 0)
497		timeout = schedule_timeout(YUREX_WRITE_TIMEOUT);
498	finish_wait(&dev->waitq, &wait);
499
500	mutex_unlock(&dev->io_mutex);
501
502	if (retval < 0) {
503		dev_err(&dev->interface->dev,
504			"%s - failed to send bulk msg, error %d\n",
505			__func__, retval);
506		goto error;
507	}
508	if (set && timeout)
509		dev->bbu = c2;
510	return timeout ? count : -EIO;
511
512error:
513	return retval;
514}
515
516static const struct file_operations yurex_fops = {
517	.owner =	THIS_MODULE,
518	.read =		yurex_read,
519	.write =	yurex_write,
520	.open =		yurex_open,
521	.release =	yurex_release,
522	.fasync	=	yurex_fasync,
523	.llseek =	default_llseek,
524};
525
526module_usb_driver(yurex_driver);
527
528MODULE_LICENSE("GPL");
v4.17
  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Driver for Meywa-Denki & KAYAC YUREX
  4 *
  5 * Copyright (C) 2010 Tomoki Sekiyama (tomoki.sekiyama@gmail.com)
  6 */
  7
  8#include <linux/kernel.h>
  9#include <linux/errno.h>
 10#include <linux/slab.h>
 11#include <linux/module.h>
 12#include <linux/kref.h>
 13#include <linux/mutex.h>
 14#include <linux/uaccess.h>
 15#include <linux/usb.h>
 16#include <linux/hid.h>
 17
 18#define DRIVER_AUTHOR "Tomoki Sekiyama"
 19#define DRIVER_DESC "Driver for Meywa-Denki & KAYAC YUREX"
 20
 21#define YUREX_VENDOR_ID		0x0c45
 22#define YUREX_PRODUCT_ID	0x1010
 23
 24#define CMD_ACK		'!'
 25#define CMD_ANIMATE	'A'
 26#define CMD_COUNT	'C'
 27#define CMD_LED		'L'
 28#define CMD_READ	'R'
 29#define CMD_SET		'S'
 30#define CMD_VERSION	'V'
 31#define CMD_EOF		0x0d
 32#define CMD_PADDING	0xff
 33
 34#define YUREX_BUF_SIZE		8
 35#define YUREX_WRITE_TIMEOUT	(HZ*2)
 36
 37/* table of devices that work with this driver */
 38static struct usb_device_id yurex_table[] = {
 39	{ USB_DEVICE(YUREX_VENDOR_ID, YUREX_PRODUCT_ID) },
 40	{ }					/* Terminating entry */
 41};
 42MODULE_DEVICE_TABLE(usb, yurex_table);
 43
 44#ifdef CONFIG_USB_DYNAMIC_MINORS
 45#define YUREX_MINOR_BASE	0
 46#else
 47#define YUREX_MINOR_BASE	192
 48#endif
 49
 50/* Structure to hold all of our device specific stuff */
 51struct usb_yurex {
 52	struct usb_device	*udev;
 53	struct usb_interface	*interface;
 54	__u8			int_in_endpointAddr;
 55	struct urb		*urb;		/* URB for interrupt in */
 56	unsigned char           *int_buffer;	/* buffer for intterupt in */
 57	struct urb		*cntl_urb;	/* URB for control msg */
 58	struct usb_ctrlrequest	*cntl_req;	/* req for control msg */
 59	unsigned char		*cntl_buffer;	/* buffer for control msg */
 60
 61	struct kref		kref;
 62	struct mutex		io_mutex;
 
 63	struct fasync_struct	*async_queue;
 64	wait_queue_head_t	waitq;
 65
 66	spinlock_t		lock;
 67	__s64			bbu;		/* BBU from device */
 68};
 69#define to_yurex_dev(d) container_of(d, struct usb_yurex, kref)
 70
 71static struct usb_driver yurex_driver;
 72static const struct file_operations yurex_fops;
 73
 74
 75static void yurex_control_callback(struct urb *urb)
 76{
 77	struct usb_yurex *dev = urb->context;
 78	int status = urb->status;
 79
 80	if (status) {
 81		dev_err(&urb->dev->dev, "%s - control failed: %d\n",
 82			__func__, status);
 83		wake_up_interruptible(&dev->waitq);
 84		return;
 85	}
 86	/* on success, sender woken up by CMD_ACK int in, or timeout */
 87}
 88
 89static void yurex_delete(struct kref *kref)
 90{
 91	struct usb_yurex *dev = to_yurex_dev(kref);
 92
 93	dev_dbg(&dev->interface->dev, "%s\n", __func__);
 94
 95	usb_put_dev(dev->udev);
 96	if (dev->cntl_urb) {
 97		usb_kill_urb(dev->cntl_urb);
 98		kfree(dev->cntl_req);
 99		if (dev->cntl_buffer)
100			usb_free_coherent(dev->udev, YUREX_BUF_SIZE,
101				dev->cntl_buffer, dev->cntl_urb->transfer_dma);
102		usb_free_urb(dev->cntl_urb);
103	}
104	if (dev->urb) {
105		usb_kill_urb(dev->urb);
106		if (dev->int_buffer)
107			usb_free_coherent(dev->udev, YUREX_BUF_SIZE,
108				dev->int_buffer, dev->urb->transfer_dma);
109		usb_free_urb(dev->urb);
110	}
 
 
111	kfree(dev);
112}
113
114/*
115 * usb class driver info in order to get a minor number from the usb core,
116 * and to have the device registered with the driver core
117 */
118static struct usb_class_driver yurex_class = {
119	.name =		"yurex%d",
120	.fops =		&yurex_fops,
121	.minor_base =	YUREX_MINOR_BASE,
122};
123
124static void yurex_interrupt(struct urb *urb)
125{
126	struct usb_yurex *dev = urb->context;
127	unsigned char *buf = dev->int_buffer;
128	int status = urb->status;
129	unsigned long flags;
130	int retval, i;
131
132	switch (status) {
133	case 0: /*success*/
134		break;
 
135	case -EOVERFLOW:
136		dev_err(&dev->interface->dev,
137			"%s - overflow with length %d, actual length is %d\n",
138			__func__, YUREX_BUF_SIZE, dev->urb->actual_length);
139	case -ECONNRESET:
140	case -ENOENT:
141	case -ESHUTDOWN:
142	case -EILSEQ:
143		/* The device is terminated, clean up */
 
144		return;
145	default:
146		dev_err(&dev->interface->dev,
147			"%s - unknown status received: %d\n", __func__, status);
148		goto exit;
149	}
150
151	/* handle received message */
152	switch (buf[0]) {
153	case CMD_COUNT:
154	case CMD_READ:
155		if (buf[6] == CMD_EOF) {
156			spin_lock_irqsave(&dev->lock, flags);
157			dev->bbu = 0;
158			for (i = 1; i < 6; i++) {
159				dev->bbu += buf[i];
160				if (i != 5)
161					dev->bbu <<= 8;
162			}
163			dev_dbg(&dev->interface->dev, "%s count: %lld\n",
164				__func__, dev->bbu);
165			spin_unlock_irqrestore(&dev->lock, flags);
166
167			kill_fasync(&dev->async_queue, SIGIO, POLL_IN);
168		}
169		else
170			dev_dbg(&dev->interface->dev,
171				"data format error - no EOF\n");
172		break;
173	case CMD_ACK:
174		dev_dbg(&dev->interface->dev, "%s ack: %c\n",
175			__func__, buf[1]);
176		wake_up_interruptible(&dev->waitq);
177		break;
178	}
179
180exit:
181	retval = usb_submit_urb(dev->urb, GFP_ATOMIC);
182	if (retval) {
183		dev_err(&dev->interface->dev, "%s - usb_submit_urb failed: %d\n",
184			__func__, retval);
185	}
186}
187
188static int yurex_probe(struct usb_interface *interface, const struct usb_device_id *id)
189{
190	struct usb_yurex *dev;
191	struct usb_host_interface *iface_desc;
192	struct usb_endpoint_descriptor *endpoint;
193	int retval = -ENOMEM;
194	DEFINE_WAIT(wait);
195	int res;
196
197	/* allocate memory for our device state and initialize it */
198	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
199	if (!dev)
200		goto error;
201	kref_init(&dev->kref);
202	mutex_init(&dev->io_mutex);
203	spin_lock_init(&dev->lock);
204	init_waitqueue_head(&dev->waitq);
205
206	dev->udev = usb_get_dev(interface_to_usbdev(interface));
207	dev->interface = interface;
208
209	/* set up the endpoint information */
210	iface_desc = interface->cur_altsetting;
211	res = usb_find_int_in_endpoint(iface_desc, &endpoint);
212	if (res) {
213		dev_err(&interface->dev, "Could not find endpoints\n");
214		retval = res;
215		goto error;
216	}
217
218	dev->int_in_endpointAddr = endpoint->bEndpointAddress;
219
220	/* allocate control URB */
221	dev->cntl_urb = usb_alloc_urb(0, GFP_KERNEL);
222	if (!dev->cntl_urb)
223		goto error;
224
225	/* allocate buffer for control req */
226	dev->cntl_req = kmalloc(YUREX_BUF_SIZE, GFP_KERNEL);
227	if (!dev->cntl_req)
228		goto error;
229
230	/* allocate buffer for control msg */
231	dev->cntl_buffer = usb_alloc_coherent(dev->udev, YUREX_BUF_SIZE,
232					      GFP_KERNEL,
233					      &dev->cntl_urb->transfer_dma);
234	if (!dev->cntl_buffer) {
235		dev_err(&interface->dev, "Could not allocate cntl_buffer\n");
236		goto error;
237	}
238
239	/* configure control URB */
240	dev->cntl_req->bRequestType = USB_DIR_OUT | USB_TYPE_CLASS |
241				      USB_RECIP_INTERFACE;
242	dev->cntl_req->bRequest	= HID_REQ_SET_REPORT;
243	dev->cntl_req->wValue	= cpu_to_le16((HID_OUTPUT_REPORT + 1) << 8);
244	dev->cntl_req->wIndex	= cpu_to_le16(iface_desc->desc.bInterfaceNumber);
245	dev->cntl_req->wLength	= cpu_to_le16(YUREX_BUF_SIZE);
246
247	usb_fill_control_urb(dev->cntl_urb, dev->udev,
248			     usb_sndctrlpipe(dev->udev, 0),
249			     (void *)dev->cntl_req, dev->cntl_buffer,
250			     YUREX_BUF_SIZE, yurex_control_callback, dev);
251	dev->cntl_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
252
253
254	/* allocate interrupt URB */
255	dev->urb = usb_alloc_urb(0, GFP_KERNEL);
256	if (!dev->urb)
257		goto error;
258
259	/* allocate buffer for interrupt in */
260	dev->int_buffer = usb_alloc_coherent(dev->udev, YUREX_BUF_SIZE,
261					GFP_KERNEL, &dev->urb->transfer_dma);
262	if (!dev->int_buffer) {
263		dev_err(&interface->dev, "Could not allocate int_buffer\n");
264		goto error;
265	}
266
267	/* configure interrupt URB */
268	usb_fill_int_urb(dev->urb, dev->udev,
269			 usb_rcvintpipe(dev->udev, dev->int_in_endpointAddr),
270			 dev->int_buffer, YUREX_BUF_SIZE, yurex_interrupt,
271			 dev, 1);
272	dev->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
273	if (usb_submit_urb(dev->urb, GFP_KERNEL)) {
274		retval = -EIO;
275		dev_err(&interface->dev, "Could not submitting URB\n");
276		goto error;
277	}
278
279	/* save our data pointer in this interface device */
280	usb_set_intfdata(interface, dev);
281	dev->bbu = -1;
282
283	/* we can register the device now, as it is ready */
284	retval = usb_register_dev(interface, &yurex_class);
285	if (retval) {
286		dev_err(&interface->dev,
287			"Not able to get a minor for this device.\n");
288		usb_set_intfdata(interface, NULL);
289		goto error;
290	}
291
292	dev_info(&interface->dev,
293		 "USB YUREX device now attached to Yurex #%d\n",
294		 interface->minor);
295
296	return 0;
297
298error:
299	if (dev)
300		/* this frees allocated memory */
301		kref_put(&dev->kref, yurex_delete);
302	return retval;
303}
304
305static void yurex_disconnect(struct usb_interface *interface)
306{
307	struct usb_yurex *dev;
308	int minor = interface->minor;
309
310	dev = usb_get_intfdata(interface);
311	usb_set_intfdata(interface, NULL);
312
313	/* give back our minor */
314	usb_deregister_dev(interface, &yurex_class);
315
316	/* prevent more I/O from starting */
 
 
317	mutex_lock(&dev->io_mutex);
318	dev->interface = NULL;
319	mutex_unlock(&dev->io_mutex);
320
321	/* wakeup waiters */
322	kill_fasync(&dev->async_queue, SIGIO, POLL_IN);
323	wake_up_interruptible(&dev->waitq);
324
325	/* decrement our usage count */
326	kref_put(&dev->kref, yurex_delete);
327
328	dev_info(&interface->dev, "USB YUREX #%d now disconnected\n", minor);
329}
330
331static struct usb_driver yurex_driver = {
332	.name =		"yurex",
333	.probe =	yurex_probe,
334	.disconnect =	yurex_disconnect,
335	.id_table =	yurex_table,
336};
337
338
339static int yurex_fasync(int fd, struct file *file, int on)
340{
341	struct usb_yurex *dev;
342
343	dev = file->private_data;
344	return fasync_helper(fd, file, on, &dev->async_queue);
345}
346
347static int yurex_open(struct inode *inode, struct file *file)
348{
349	struct usb_yurex *dev;
350	struct usb_interface *interface;
351	int subminor;
352	int retval = 0;
353
354	subminor = iminor(inode);
355
356	interface = usb_find_interface(&yurex_driver, subminor);
357	if (!interface) {
358		printk(KERN_ERR "%s - error, can't find device for minor %d",
359		       __func__, subminor);
360		retval = -ENODEV;
361		goto exit;
362	}
363
364	dev = usb_get_intfdata(interface);
365	if (!dev) {
366		retval = -ENODEV;
367		goto exit;
368	}
369
370	/* increment our usage count for the device */
371	kref_get(&dev->kref);
372
373	/* save our object in the file's private structure */
374	mutex_lock(&dev->io_mutex);
375	file->private_data = dev;
376	mutex_unlock(&dev->io_mutex);
377
378exit:
379	return retval;
380}
381
382static int yurex_release(struct inode *inode, struct file *file)
383{
384	struct usb_yurex *dev;
385
386	dev = file->private_data;
387	if (dev == NULL)
388		return -ENODEV;
389
390	/* decrement the count on our device */
391	kref_put(&dev->kref, yurex_delete);
392	return 0;
393}
394
395static ssize_t yurex_read(struct file *file, char __user *buffer, size_t count,
396			  loff_t *ppos)
397{
398	struct usb_yurex *dev;
399	int retval = 0;
400	int bytes_read = 0;
401	char in_buffer[20];
402	unsigned long flags;
403
404	dev = file->private_data;
405
406	mutex_lock(&dev->io_mutex);
407	if (!dev->interface) {		/* already disconnected */
408		retval = -ENODEV;
409		goto exit;
410	}
411
412	spin_lock_irqsave(&dev->lock, flags);
413	bytes_read = snprintf(in_buffer, 20, "%lld\n", dev->bbu);
414	spin_unlock_irqrestore(&dev->lock, flags);
 
415
416	if (*ppos < bytes_read) {
417		if (copy_to_user(buffer, in_buffer + *ppos, bytes_read - *ppos))
418			retval = -EFAULT;
419		else {
420			retval = bytes_read - *ppos;
421			*ppos += bytes_read;
422		}
423	}
424
425exit:
426	mutex_unlock(&dev->io_mutex);
427	return retval;
428}
429
430static ssize_t yurex_write(struct file *file, const char __user *user_buffer,
431			   size_t count, loff_t *ppos)
432{
433	struct usb_yurex *dev;
434	int i, set = 0, retval = 0;
435	char buffer[16];
436	char *data = buffer;
437	unsigned long long c, c2 = 0;
438	signed long timeout = 0;
439	DEFINE_WAIT(wait);
440
441	count = min(sizeof(buffer), count);
442	dev = file->private_data;
443
444	/* verify that we actually have some data to write */
445	if (count == 0)
446		goto error;
447
448	mutex_lock(&dev->io_mutex);
449	if (!dev->interface) {		/* already disconnected */
450		mutex_unlock(&dev->io_mutex);
451		retval = -ENODEV;
452		goto error;
453	}
454
455	if (copy_from_user(buffer, user_buffer, count)) {
456		mutex_unlock(&dev->io_mutex);
457		retval = -EFAULT;
458		goto error;
459	}
 
460	memset(dev->cntl_buffer, CMD_PADDING, YUREX_BUF_SIZE);
461
462	switch (buffer[0]) {
463	case CMD_ANIMATE:
464	case CMD_LED:
465		dev->cntl_buffer[0] = buffer[0];
466		dev->cntl_buffer[1] = buffer[1];
467		dev->cntl_buffer[2] = CMD_EOF;
468		break;
469	case CMD_READ:
470	case CMD_VERSION:
471		dev->cntl_buffer[0] = buffer[0];
472		dev->cntl_buffer[1] = 0x00;
473		dev->cntl_buffer[2] = CMD_EOF;
474		break;
475	case CMD_SET:
476		data++;
477		/* FALL THROUGH */
478	case '0' ... '9':
479		set = 1;
480		c = c2 = simple_strtoull(data, NULL, 0);
481		dev->cntl_buffer[0] = CMD_SET;
482		for (i = 1; i < 6; i++) {
483			dev->cntl_buffer[i] = (c>>32) & 0xff;
484			c <<= 8;
485		}
486		buffer[6] = CMD_EOF;
487		break;
488	default:
489		mutex_unlock(&dev->io_mutex);
490		return -EINVAL;
491	}
492
493	/* send the data as the control msg */
494	prepare_to_wait(&dev->waitq, &wait, TASK_INTERRUPTIBLE);
495	dev_dbg(&dev->interface->dev, "%s - submit %c\n", __func__,
496		dev->cntl_buffer[0]);
497	retval = usb_submit_urb(dev->cntl_urb, GFP_KERNEL);
498	if (retval >= 0)
499		timeout = schedule_timeout(YUREX_WRITE_TIMEOUT);
500	finish_wait(&dev->waitq, &wait);
501
502	mutex_unlock(&dev->io_mutex);
503
504	if (retval < 0) {
505		dev_err(&dev->interface->dev,
506			"%s - failed to send bulk msg, error %d\n",
507			__func__, retval);
508		goto error;
509	}
510	if (set && timeout)
511		dev->bbu = c2;
512	return timeout ? count : -EIO;
513
514error:
515	return retval;
516}
517
518static const struct file_operations yurex_fops = {
519	.owner =	THIS_MODULE,
520	.read =		yurex_read,
521	.write =	yurex_write,
522	.open =		yurex_open,
523	.release =	yurex_release,
524	.fasync	=	yurex_fasync,
525	.llseek =	default_llseek,
526};
527
528module_usb_driver(yurex_driver);
529
530MODULE_LICENSE("GPL");