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1/*
2 * Driver for Meywa-Denki & KAYAC YUREX
3 *
4 * Copyright (C) 2010 Tomoki Sekiyama (tomoki.sekiyama@gmail.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation, version 2.
9 *
10 */
11
12#include <linux/kernel.h>
13#include <linux/errno.h>
14#include <linux/init.h>
15#include <linux/slab.h>
16#include <linux/module.h>
17#include <linux/kref.h>
18#include <linux/mutex.h>
19#include <linux/uaccess.h>
20#include <linux/usb.h>
21#include <linux/hid.h>
22
23#define DRIVER_AUTHOR "Tomoki Sekiyama"
24#define DRIVER_DESC "Driver for Meywa-Denki & KAYAC YUREX"
25
26#define YUREX_VENDOR_ID 0x0c45
27#define YUREX_PRODUCT_ID 0x1010
28
29#define CMD_ACK '!'
30#define CMD_ANIMATE 'A'
31#define CMD_COUNT 'C'
32#define CMD_LED 'L'
33#define CMD_READ 'R'
34#define CMD_SET 'S'
35#define CMD_VERSION 'V'
36#define CMD_EOF 0x0d
37#define CMD_PADDING 0xff
38
39#define YUREX_BUF_SIZE 8
40#define YUREX_WRITE_TIMEOUT (HZ*2)
41
42/* table of devices that work with this driver */
43static struct usb_device_id yurex_table[] = {
44 { USB_DEVICE(YUREX_VENDOR_ID, YUREX_PRODUCT_ID) },
45 { } /* Terminating entry */
46};
47MODULE_DEVICE_TABLE(usb, yurex_table);
48
49#ifdef CONFIG_USB_DYNAMIC_MINORS
50#define YUREX_MINOR_BASE 0
51#else
52#define YUREX_MINOR_BASE 192
53#endif
54
55/* Structure to hold all of our device specific stuff */
56struct usb_yurex {
57 struct usb_device *udev;
58 struct usb_interface *interface;
59 __u8 int_in_endpointAddr;
60 struct urb *urb; /* URB for interrupt in */
61 unsigned char *int_buffer; /* buffer for intterupt in */
62 struct urb *cntl_urb; /* URB for control msg */
63 struct usb_ctrlrequest *cntl_req; /* req for control msg */
64 unsigned char *cntl_buffer; /* buffer for control msg */
65
66 struct kref kref;
67 struct mutex io_mutex;
68 struct fasync_struct *async_queue;
69 wait_queue_head_t waitq;
70
71 spinlock_t lock;
72 __s64 bbu; /* BBU from device */
73};
74#define to_yurex_dev(d) container_of(d, struct usb_yurex, kref)
75
76static struct usb_driver yurex_driver;
77static const struct file_operations yurex_fops;
78
79
80static void yurex_control_callback(struct urb *urb)
81{
82 struct usb_yurex *dev = urb->context;
83 int status = urb->status;
84
85 if (status) {
86 err("%s - control failed: %d\n", __func__, status);
87 wake_up_interruptible(&dev->waitq);
88 return;
89 }
90 /* on success, sender woken up by CMD_ACK int in, or timeout */
91}
92
93static void yurex_delete(struct kref *kref)
94{
95 struct usb_yurex *dev = to_yurex_dev(kref);
96
97 dbg("yurex_delete");
98
99 usb_put_dev(dev->udev);
100 if (dev->cntl_urb) {
101 usb_kill_urb(dev->cntl_urb);
102 if (dev->cntl_req)
103 usb_free_coherent(dev->udev, YUREX_BUF_SIZE,
104 dev->cntl_req, dev->cntl_urb->setup_dma);
105 if (dev->cntl_buffer)
106 usb_free_coherent(dev->udev, YUREX_BUF_SIZE,
107 dev->cntl_buffer, dev->cntl_urb->transfer_dma);
108 usb_free_urb(dev->cntl_urb);
109 }
110 if (dev->urb) {
111 usb_kill_urb(dev->urb);
112 if (dev->int_buffer)
113 usb_free_coherent(dev->udev, YUREX_BUF_SIZE,
114 dev->int_buffer, dev->urb->transfer_dma);
115 usb_free_urb(dev->urb);
116 }
117 kfree(dev);
118}
119
120/*
121 * usb class driver info in order to get a minor number from the usb core,
122 * and to have the device registered with the driver core
123 */
124static struct usb_class_driver yurex_class = {
125 .name = "yurex%d",
126 .fops = &yurex_fops,
127 .minor_base = YUREX_MINOR_BASE,
128};
129
130static void yurex_interrupt(struct urb *urb)
131{
132 struct usb_yurex *dev = urb->context;
133 unsigned char *buf = dev->int_buffer;
134 int status = urb->status;
135 unsigned long flags;
136 int retval, i;
137
138 switch (status) {
139 case 0: /*success*/
140 break;
141 case -EOVERFLOW:
142 err("%s - overflow with length %d, actual length is %d",
143 __func__, YUREX_BUF_SIZE, dev->urb->actual_length);
144 case -ECONNRESET:
145 case -ENOENT:
146 case -ESHUTDOWN:
147 case -EILSEQ:
148 /* The device is terminated, clean up */
149 return;
150 default:
151 err("%s - unknown status received: %d", __func__, status);
152 goto exit;
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 dbg("%s count: %lld", __func__, dev->bbu);
168 spin_unlock_irqrestore(&dev->lock, flags);
169
170 kill_fasync(&dev->async_queue, SIGIO, POLL_IN);
171 }
172 else
173 dbg("data format error - no EOF");
174 break;
175 case CMD_ACK:
176 dbg("%s ack: %c", __func__, buf[1]);
177 wake_up_interruptible(&dev->waitq);
178 break;
179 }
180
181exit:
182 retval = usb_submit_urb(dev->urb, GFP_ATOMIC);
183 if (retval) {
184 err("%s - usb_submit_urb failed: %d",
185 __func__, retval);
186 }
187}
188
189static int yurex_probe(struct usb_interface *interface, const struct usb_device_id *id)
190{
191 struct usb_yurex *dev;
192 struct usb_host_interface *iface_desc;
193 struct usb_endpoint_descriptor *endpoint;
194 int retval = -ENOMEM;
195 int i;
196 DEFINE_WAIT(wait);
197
198 /* allocate memory for our device state and initialize it */
199 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
200 if (!dev) {
201 err("Out of memory");
202 goto error;
203 }
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 = interface;
211
212 /* set up the endpoint information */
213 iface_desc = interface->cur_altsetting;
214 for (i = 0; i < iface_desc->desc.bNumEndpoints; i++) {
215 endpoint = &iface_desc->endpoint[i].desc;
216
217 if (usb_endpoint_is_int_in(endpoint)) {
218 dev->int_in_endpointAddr = endpoint->bEndpointAddress;
219 break;
220 }
221 }
222 if (!dev->int_in_endpointAddr) {
223 retval = -ENODEV;
224 err("Could not find endpoints");
225 goto error;
226 }
227
228
229 /* allocate control URB */
230 dev->cntl_urb = usb_alloc_urb(0, GFP_KERNEL);
231 if (!dev->cntl_urb) {
232 err("Could not allocate control URB");
233 goto error;
234 }
235
236 /* allocate buffer for control req */
237 dev->cntl_req = usb_alloc_coherent(dev->udev, YUREX_BUF_SIZE,
238 GFP_KERNEL,
239 &dev->cntl_urb->setup_dma);
240 if (!dev->cntl_req) {
241 err("Could not allocate cntl_req");
242 goto error;
243 }
244
245 /* allocate buffer for control msg */
246 dev->cntl_buffer = usb_alloc_coherent(dev->udev, YUREX_BUF_SIZE,
247 GFP_KERNEL,
248 &dev->cntl_urb->transfer_dma);
249 if (!dev->cntl_buffer) {
250 err("Could not allocate cntl_buffer");
251 goto error;
252 }
253
254 /* configure control URB */
255 dev->cntl_req->bRequestType = USB_DIR_OUT | USB_TYPE_CLASS |
256 USB_RECIP_INTERFACE;
257 dev->cntl_req->bRequest = HID_REQ_SET_REPORT;
258 dev->cntl_req->wValue = cpu_to_le16((HID_OUTPUT_REPORT + 1) << 8);
259 dev->cntl_req->wIndex = cpu_to_le16(iface_desc->desc.bInterfaceNumber);
260 dev->cntl_req->wLength = cpu_to_le16(YUREX_BUF_SIZE);
261
262 usb_fill_control_urb(dev->cntl_urb, dev->udev,
263 usb_sndctrlpipe(dev->udev, 0),
264 (void *)dev->cntl_req, dev->cntl_buffer,
265 YUREX_BUF_SIZE, yurex_control_callback, dev);
266 dev->cntl_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
267
268
269 /* allocate interrupt URB */
270 dev->urb = usb_alloc_urb(0, GFP_KERNEL);
271 if (!dev->urb) {
272 err("Could not allocate URB");
273 goto error;
274 }
275
276 /* allocate buffer for interrupt in */
277 dev->int_buffer = usb_alloc_coherent(dev->udev, YUREX_BUF_SIZE,
278 GFP_KERNEL, &dev->urb->transfer_dma);
279 if (!dev->int_buffer) {
280 err("Could not allocate int_buffer");
281 goto error;
282 }
283
284 /* configure interrupt URB */
285 usb_fill_int_urb(dev->urb, dev->udev,
286 usb_rcvintpipe(dev->udev, dev->int_in_endpointAddr),
287 dev->int_buffer, YUREX_BUF_SIZE, yurex_interrupt,
288 dev, 1);
289 dev->cntl_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
290 if (usb_submit_urb(dev->urb, GFP_KERNEL)) {
291 retval = -EIO;
292 err("Could not submitting URB");
293 goto error;
294 }
295
296 /* save our data pointer in this interface device */
297 usb_set_intfdata(interface, dev);
298
299 /* we can register the device now, as it is ready */
300 retval = usb_register_dev(interface, &yurex_class);
301 if (retval) {
302 err("Not able to get a minor for this device.");
303 usb_set_intfdata(interface, NULL);
304 goto error;
305 }
306
307 dev->bbu = -1;
308
309 dev_info(&interface->dev,
310 "USB YUREX device now attached to Yurex #%d\n",
311 interface->minor);
312
313 return 0;
314
315error:
316 if (dev)
317 /* this frees allocated memory */
318 kref_put(&dev->kref, yurex_delete);
319 return retval;
320}
321
322static void yurex_disconnect(struct usb_interface *interface)
323{
324 struct usb_yurex *dev;
325 int minor = interface->minor;
326
327 dev = usb_get_intfdata(interface);
328 usb_set_intfdata(interface, NULL);
329
330 /* give back our minor */
331 usb_deregister_dev(interface, &yurex_class);
332
333 /* prevent more I/O from starting */
334 mutex_lock(&dev->io_mutex);
335 dev->interface = NULL;
336 mutex_unlock(&dev->io_mutex);
337
338 /* wakeup waiters */
339 kill_fasync(&dev->async_queue, SIGIO, POLL_IN);
340 wake_up_interruptible(&dev->waitq);
341
342 /* decrement our usage count */
343 kref_put(&dev->kref, yurex_delete);
344
345 dev_info(&interface->dev, "USB YUREX #%d now disconnected\n", minor);
346}
347
348static struct usb_driver yurex_driver = {
349 .name = "yurex",
350 .probe = yurex_probe,
351 .disconnect = yurex_disconnect,
352 .id_table = yurex_table,
353};
354
355
356static int yurex_fasync(int fd, struct file *file, int on)
357{
358 struct usb_yurex *dev;
359
360 dev = (struct usb_yurex *)file->private_data;
361 return fasync_helper(fd, file, on, &dev->async_queue);
362}
363
364static int yurex_open(struct inode *inode, struct file *file)
365{
366 struct usb_yurex *dev;
367 struct usb_interface *interface;
368 int subminor;
369 int retval = 0;
370
371 subminor = iminor(inode);
372
373 interface = usb_find_interface(&yurex_driver, subminor);
374 if (!interface) {
375 err("%s - error, can't find device for minor %d",
376 __func__, subminor);
377 retval = -ENODEV;
378 goto exit;
379 }
380
381 dev = usb_get_intfdata(interface);
382 if (!dev) {
383 retval = -ENODEV;
384 goto exit;
385 }
386
387 /* increment our usage count for the device */
388 kref_get(&dev->kref);
389
390 /* save our object in the file's private structure */
391 mutex_lock(&dev->io_mutex);
392 file->private_data = dev;
393 mutex_unlock(&dev->io_mutex);
394
395exit:
396 return retval;
397}
398
399static int yurex_release(struct inode *inode, struct file *file)
400{
401 struct usb_yurex *dev;
402
403 dev = (struct usb_yurex *)file->private_data;
404 if (dev == NULL)
405 return -ENODEV;
406
407 yurex_fasync(-1, file, 0);
408
409 /* decrement the count on our device */
410 kref_put(&dev->kref, yurex_delete);
411 return 0;
412}
413
414static ssize_t yurex_read(struct file *file, char *buffer, size_t count, loff_t *ppos)
415{
416 struct usb_yurex *dev;
417 int retval = 0;
418 int bytes_read = 0;
419 char in_buffer[20];
420 unsigned long flags;
421
422 dev = (struct usb_yurex *)file->private_data;
423
424 mutex_lock(&dev->io_mutex);
425 if (!dev->interface) { /* already disconnected */
426 retval = -ENODEV;
427 goto exit;
428 }
429
430 spin_lock_irqsave(&dev->lock, flags);
431 bytes_read = snprintf(in_buffer, 20, "%lld\n", dev->bbu);
432 spin_unlock_irqrestore(&dev->lock, flags);
433
434 if (*ppos < bytes_read) {
435 if (copy_to_user(buffer, in_buffer + *ppos, bytes_read - *ppos))
436 retval = -EFAULT;
437 else {
438 retval = bytes_read - *ppos;
439 *ppos += bytes_read;
440 }
441 }
442
443exit:
444 mutex_unlock(&dev->io_mutex);
445 return retval;
446}
447
448static ssize_t yurex_write(struct file *file, const char *user_buffer, size_t count, loff_t *ppos)
449{
450 struct usb_yurex *dev;
451 int i, set = 0, retval = 0;
452 char buffer[16];
453 char *data = buffer;
454 unsigned long long c, c2 = 0;
455 signed long timeout = 0;
456 DEFINE_WAIT(wait);
457
458 count = min(sizeof(buffer), count);
459 dev = (struct usb_yurex *)file->private_data;
460
461 /* verify that we actually have some data to write */
462 if (count == 0)
463 goto error;
464
465 mutex_lock(&dev->io_mutex);
466 if (!dev->interface) { /* alreaday disconnected */
467 mutex_unlock(&dev->io_mutex);
468 retval = -ENODEV;
469 goto error;
470 }
471
472 if (copy_from_user(buffer, user_buffer, count)) {
473 mutex_unlock(&dev->io_mutex);
474 retval = -EFAULT;
475 goto error;
476 }
477 memset(dev->cntl_buffer, CMD_PADDING, YUREX_BUF_SIZE);
478
479 switch (buffer[0]) {
480 case CMD_ANIMATE:
481 case CMD_LED:
482 dev->cntl_buffer[0] = buffer[0];
483 dev->cntl_buffer[1] = buffer[1];
484 dev->cntl_buffer[2] = CMD_EOF;
485 break;
486 case CMD_READ:
487 case CMD_VERSION:
488 dev->cntl_buffer[0] = buffer[0];
489 dev->cntl_buffer[1] = 0x00;
490 dev->cntl_buffer[2] = CMD_EOF;
491 break;
492 case CMD_SET:
493 data++;
494 /* FALL THROUGH */
495 case '0' ... '9':
496 set = 1;
497 c = c2 = simple_strtoull(data, NULL, 0);
498 dev->cntl_buffer[0] = CMD_SET;
499 for (i = 1; i < 6; i++) {
500 dev->cntl_buffer[i] = (c>>32) & 0xff;
501 c <<= 8;
502 }
503 buffer[6] = CMD_EOF;
504 break;
505 default:
506 mutex_unlock(&dev->io_mutex);
507 return -EINVAL;
508 }
509
510 /* send the data as the control msg */
511 prepare_to_wait(&dev->waitq, &wait, TASK_INTERRUPTIBLE);
512 dbg("%s - submit %c", __func__, dev->cntl_buffer[0]);
513 retval = usb_submit_urb(dev->cntl_urb, GFP_KERNEL);
514 if (retval >= 0)
515 timeout = schedule_timeout(YUREX_WRITE_TIMEOUT);
516 finish_wait(&dev->waitq, &wait);
517
518 mutex_unlock(&dev->io_mutex);
519
520 if (retval < 0) {
521 err("%s - failed to send bulk msg, error %d", __func__, retval);
522 goto error;
523 }
524 if (set && timeout)
525 dev->bbu = c2;
526 return timeout ? count : -EIO;
527
528error:
529 return retval;
530}
531
532static const struct file_operations yurex_fops = {
533 .owner = THIS_MODULE,
534 .read = yurex_read,
535 .write = yurex_write,
536 .open = yurex_open,
537 .release = yurex_release,
538 .fasync = yurex_fasync,
539 .llseek = default_llseek,
540};
541
542
543static int __init usb_yurex_init(void)
544{
545 int result;
546
547 /* register this driver with the USB subsystem */
548 result = usb_register(&yurex_driver);
549 if (result)
550 err("usb_register failed. Error number %d", result);
551
552 return result;
553}
554
555static void __exit usb_yurex_exit(void)
556{
557 /* deregister this driver with the USB subsystem */
558 usb_deregister(&yurex_driver);
559}
560
561module_init(usb_yurex_init);
562module_exit(usb_yurex_exit);
563
564MODULE_LICENSE("GPL");
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");