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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#define MAX_S64_STRLEN 20 /* {-}922337203685477580{7,8} */
38
39/* table of devices that work with this driver */
40static struct usb_device_id yurex_table[] = {
41 { USB_DEVICE(YUREX_VENDOR_ID, YUREX_PRODUCT_ID) },
42 { } /* Terminating entry */
43};
44MODULE_DEVICE_TABLE(usb, yurex_table);
45
46#ifdef CONFIG_USB_DYNAMIC_MINORS
47#define YUREX_MINOR_BASE 0
48#else
49#define YUREX_MINOR_BASE 192
50#endif
51
52/* Structure to hold all of our device specific stuff */
53struct usb_yurex {
54 struct usb_device *udev;
55 struct usb_interface *interface;
56 __u8 int_in_endpointAddr;
57 struct urb *urb; /* URB for interrupt in */
58 unsigned char *int_buffer; /* buffer for intterupt in */
59 struct urb *cntl_urb; /* URB for control msg */
60 struct usb_ctrlrequest *cntl_req; /* req for control msg */
61 unsigned char *cntl_buffer; /* buffer for control msg */
62
63 struct kref kref;
64 struct mutex io_mutex;
65 unsigned long disconnected:1;
66 struct fasync_struct *async_queue;
67 wait_queue_head_t waitq;
68
69 spinlock_t lock;
70 __s64 bbu; /* BBU from device */
71};
72#define to_yurex_dev(d) container_of(d, struct usb_yurex, kref)
73
74static struct usb_driver yurex_driver;
75static const struct file_operations yurex_fops;
76
77
78static void yurex_control_callback(struct urb *urb)
79{
80 struct usb_yurex *dev = urb->context;
81 int status = urb->status;
82
83 if (status) {
84 dev_err(&urb->dev->dev, "%s - control failed: %d\n",
85 __func__, status);
86 wake_up_interruptible(&dev->waitq);
87 return;
88 }
89 /* on success, sender woken up by CMD_ACK int in, or timeout */
90}
91
92static void yurex_delete(struct kref *kref)
93{
94 struct usb_yurex *dev = to_yurex_dev(kref);
95
96 dev_dbg(&dev->interface->dev, "%s\n", __func__);
97
98 if (dev->cntl_urb) {
99 usb_kill_urb(dev->cntl_urb);
100 kfree(dev->cntl_req);
101 usb_free_coherent(dev->udev, YUREX_BUF_SIZE,
102 dev->cntl_buffer, dev->cntl_urb->transfer_dma);
103 usb_free_urb(dev->cntl_urb);
104 }
105 if (dev->urb) {
106 usb_kill_urb(dev->urb);
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 return;
143 case -ECONNRESET:
144 case -ENOENT:
145 case -ESHUTDOWN:
146 case -EILSEQ:
147 case -EPROTO:
148 case -ETIME:
149 return;
150 default:
151 dev_err(&dev->interface->dev,
152 "%s - unknown status received: %d\n", __func__, status);
153 return;
154 }
155
156 /* handle received message */
157 switch (buf[0]) {
158 case CMD_COUNT:
159 case CMD_READ:
160 if (buf[6] == CMD_EOF) {
161 spin_lock_irqsave(&dev->lock, flags);
162 dev->bbu = 0;
163 for (i = 1; i < 6; i++) {
164 dev->bbu += buf[i];
165 if (i != 5)
166 dev->bbu <<= 8;
167 }
168 dev_dbg(&dev->interface->dev, "%s count: %lld\n",
169 __func__, dev->bbu);
170 spin_unlock_irqrestore(&dev->lock, flags);
171
172 kill_fasync(&dev->async_queue, SIGIO, POLL_IN);
173 }
174 else
175 dev_dbg(&dev->interface->dev,
176 "data format error - no EOF\n");
177 break;
178 case CMD_ACK:
179 dev_dbg(&dev->interface->dev, "%s ack: %c\n",
180 __func__, buf[1]);
181 wake_up_interruptible(&dev->waitq);
182 break;
183 }
184
185 retval = usb_submit_urb(dev->urb, GFP_ATOMIC);
186 if (retval) {
187 dev_err(&dev->interface->dev, "%s - usb_submit_urb failed: %d\n",
188 __func__, retval);
189 }
190}
191
192static int yurex_probe(struct usb_interface *interface, const struct usb_device_id *id)
193{
194 struct usb_yurex *dev;
195 struct usb_host_interface *iface_desc;
196 struct usb_endpoint_descriptor *endpoint;
197 int retval = -ENOMEM;
198 DEFINE_WAIT(wait);
199 int res;
200
201 /* allocate memory for our device state and initialize it */
202 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
203 if (!dev)
204 goto error;
205 kref_init(&dev->kref);
206 mutex_init(&dev->io_mutex);
207 spin_lock_init(&dev->lock);
208 init_waitqueue_head(&dev->waitq);
209
210 dev->udev = usb_get_dev(interface_to_usbdev(interface));
211 dev->interface = usb_get_intf(interface);
212
213 /* set up the endpoint information */
214 iface_desc = interface->cur_altsetting;
215 res = usb_find_int_in_endpoint(iface_desc, &endpoint);
216 if (res) {
217 dev_err(&interface->dev, "Could not find endpoints\n");
218 retval = res;
219 goto error;
220 }
221
222 dev->int_in_endpointAddr = endpoint->bEndpointAddress;
223
224 /* allocate control URB */
225 dev->cntl_urb = usb_alloc_urb(0, GFP_KERNEL);
226 if (!dev->cntl_urb)
227 goto error;
228
229 /* allocate buffer for control req */
230 dev->cntl_req = kmalloc(YUREX_BUF_SIZE, GFP_KERNEL);
231 if (!dev->cntl_req)
232 goto error;
233
234 /* allocate buffer for control msg */
235 dev->cntl_buffer = usb_alloc_coherent(dev->udev, YUREX_BUF_SIZE,
236 GFP_KERNEL,
237 &dev->cntl_urb->transfer_dma);
238 if (!dev->cntl_buffer) {
239 dev_err(&interface->dev, "Could not allocate cntl_buffer\n");
240 goto error;
241 }
242
243 /* configure control URB */
244 dev->cntl_req->bRequestType = USB_DIR_OUT | USB_TYPE_CLASS |
245 USB_RECIP_INTERFACE;
246 dev->cntl_req->bRequest = HID_REQ_SET_REPORT;
247 dev->cntl_req->wValue = cpu_to_le16((HID_OUTPUT_REPORT + 1) << 8);
248 dev->cntl_req->wIndex = cpu_to_le16(iface_desc->desc.bInterfaceNumber);
249 dev->cntl_req->wLength = cpu_to_le16(YUREX_BUF_SIZE);
250
251 usb_fill_control_urb(dev->cntl_urb, dev->udev,
252 usb_sndctrlpipe(dev->udev, 0),
253 (void *)dev->cntl_req, dev->cntl_buffer,
254 YUREX_BUF_SIZE, yurex_control_callback, dev);
255 dev->cntl_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
256
257
258 /* allocate interrupt URB */
259 dev->urb = usb_alloc_urb(0, GFP_KERNEL);
260 if (!dev->urb)
261 goto error;
262
263 /* allocate buffer for interrupt in */
264 dev->int_buffer = usb_alloc_coherent(dev->udev, YUREX_BUF_SIZE,
265 GFP_KERNEL, &dev->urb->transfer_dma);
266 if (!dev->int_buffer) {
267 dev_err(&interface->dev, "Could not allocate int_buffer\n");
268 goto error;
269 }
270
271 /* configure interrupt URB */
272 usb_fill_int_urb(dev->urb, dev->udev,
273 usb_rcvintpipe(dev->udev, dev->int_in_endpointAddr),
274 dev->int_buffer, YUREX_BUF_SIZE, yurex_interrupt,
275 dev, 1);
276 dev->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
277 if (usb_submit_urb(dev->urb, GFP_KERNEL)) {
278 retval = -EIO;
279 dev_err(&interface->dev, "Could not submitting URB\n");
280 goto error;
281 }
282
283 /* save our data pointer in this interface device */
284 usb_set_intfdata(interface, dev);
285 dev->bbu = -1;
286
287 /* we can register the device now, as it is ready */
288 retval = usb_register_dev(interface, &yurex_class);
289 if (retval) {
290 dev_err(&interface->dev,
291 "Not able to get a minor for this device.\n");
292 usb_set_intfdata(interface, NULL);
293 goto error;
294 }
295
296 dev_info(&interface->dev,
297 "USB YUREX device now attached to Yurex #%d\n",
298 interface->minor);
299
300 return 0;
301
302error:
303 if (dev)
304 /* this frees allocated memory */
305 kref_put(&dev->kref, yurex_delete);
306 return retval;
307}
308
309static void yurex_disconnect(struct usb_interface *interface)
310{
311 struct usb_yurex *dev;
312 int minor = interface->minor;
313
314 dev = usb_get_intfdata(interface);
315 usb_set_intfdata(interface, NULL);
316
317 /* give back our minor */
318 usb_deregister_dev(interface, &yurex_class);
319
320 /* prevent more I/O from starting */
321 usb_poison_urb(dev->urb);
322 usb_poison_urb(dev->cntl_urb);
323 mutex_lock(&dev->io_mutex);
324 dev->disconnected = 1;
325 mutex_unlock(&dev->io_mutex);
326
327 /* wakeup waiters */
328 kill_fasync(&dev->async_queue, SIGIO, POLL_IN);
329 wake_up_interruptible(&dev->waitq);
330
331 /* decrement our usage count */
332 kref_put(&dev->kref, yurex_delete);
333
334 dev_info(&interface->dev, "USB YUREX #%d now disconnected\n", minor);
335}
336
337static struct usb_driver yurex_driver = {
338 .name = "yurex",
339 .probe = yurex_probe,
340 .disconnect = yurex_disconnect,
341 .id_table = yurex_table,
342};
343
344
345static int yurex_fasync(int fd, struct file *file, int on)
346{
347 struct usb_yurex *dev;
348
349 dev = file->private_data;
350 return fasync_helper(fd, file, on, &dev->async_queue);
351}
352
353static int yurex_open(struct inode *inode, struct file *file)
354{
355 struct usb_yurex *dev;
356 struct usb_interface *interface;
357 int subminor;
358 int retval = 0;
359
360 subminor = iminor(inode);
361
362 interface = usb_find_interface(&yurex_driver, subminor);
363 if (!interface) {
364 printk(KERN_ERR "%s - error, can't find device for minor %d",
365 __func__, subminor);
366 retval = -ENODEV;
367 goto exit;
368 }
369
370 dev = usb_get_intfdata(interface);
371 if (!dev) {
372 retval = -ENODEV;
373 goto exit;
374 }
375
376 /* increment our usage count for the device */
377 kref_get(&dev->kref);
378
379 /* save our object in the file's private structure */
380 mutex_lock(&dev->io_mutex);
381 file->private_data = dev;
382 mutex_unlock(&dev->io_mutex);
383
384exit:
385 return retval;
386}
387
388static int yurex_release(struct inode *inode, struct file *file)
389{
390 struct usb_yurex *dev;
391
392 dev = file->private_data;
393 if (dev == NULL)
394 return -ENODEV;
395
396 /* decrement the count on our device */
397 kref_put(&dev->kref, yurex_delete);
398 return 0;
399}
400
401static ssize_t yurex_read(struct file *file, char __user *buffer, size_t count,
402 loff_t *ppos)
403{
404 struct usb_yurex *dev;
405 int len = 0;
406 char in_buffer[MAX_S64_STRLEN];
407 unsigned long flags;
408
409 dev = file->private_data;
410
411 mutex_lock(&dev->io_mutex);
412 if (dev->disconnected) { /* already disconnected */
413 mutex_unlock(&dev->io_mutex);
414 return -ENODEV;
415 }
416
417 if (WARN_ON_ONCE(dev->bbu > S64_MAX || dev->bbu < S64_MIN)) {
418 mutex_unlock(&dev->io_mutex);
419 return -EIO;
420 }
421
422 spin_lock_irqsave(&dev->lock, flags);
423 scnprintf(in_buffer, MAX_S64_STRLEN, "%lld\n", dev->bbu);
424 spin_unlock_irqrestore(&dev->lock, flags);
425 mutex_unlock(&dev->io_mutex);
426
427 return simple_read_from_buffer(buffer, count, ppos, in_buffer, len);
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 + 1];
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) - 1, 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->disconnected) { /* 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 buffer[count] = 0;
461 memset(dev->cntl_buffer, CMD_PADDING, YUREX_BUF_SIZE);
462
463 switch (buffer[0]) {
464 case CMD_ANIMATE:
465 case CMD_LED:
466 dev->cntl_buffer[0] = buffer[0];
467 dev->cntl_buffer[1] = buffer[1];
468 dev->cntl_buffer[2] = CMD_EOF;
469 break;
470 case CMD_READ:
471 case CMD_VERSION:
472 dev->cntl_buffer[0] = buffer[0];
473 dev->cntl_buffer[1] = 0x00;
474 dev->cntl_buffer[2] = CMD_EOF;
475 break;
476 case CMD_SET:
477 data++;
478 fallthrough;
479 case '0' ... '9':
480 set = 1;
481 c = c2 = simple_strtoull(data, NULL, 0);
482 dev->cntl_buffer[0] = CMD_SET;
483 for (i = 1; i < 6; i++) {
484 dev->cntl_buffer[i] = (c>>32) & 0xff;
485 c <<= 8;
486 }
487 buffer[6] = CMD_EOF;
488 break;
489 default:
490 mutex_unlock(&dev->io_mutex);
491 return -EINVAL;
492 }
493
494 /* send the data as the control msg */
495 prepare_to_wait(&dev->waitq, &wait, TASK_INTERRUPTIBLE);
496 dev_dbg(&dev->interface->dev, "%s - submit %c\n", __func__,
497 dev->cntl_buffer[0]);
498 retval = usb_submit_urb(dev->cntl_urb, GFP_ATOMIC);
499 if (retval >= 0)
500 timeout = schedule_timeout(YUREX_WRITE_TIMEOUT);
501 finish_wait(&dev->waitq, &wait);
502
503 /* make sure URB is idle after timeout or (spurious) CMD_ACK */
504 usb_kill_urb(dev->cntl_urb);
505
506 mutex_unlock(&dev->io_mutex);
507
508 if (retval < 0) {
509 dev_err(&dev->interface->dev,
510 "%s - failed to send bulk msg, error %d\n",
511 __func__, retval);
512 goto error;
513 }
514 if (set && timeout)
515 dev->bbu = c2;
516 return timeout ? count : -EIO;
517
518error:
519 return retval;
520}
521
522static const struct file_operations yurex_fops = {
523 .owner = THIS_MODULE,
524 .read = yurex_read,
525 .write = yurex_write,
526 .open = yurex_open,
527 .release = yurex_release,
528 .fasync = yurex_fasync,
529 .llseek = default_llseek,
530};
531
532module_usb_driver(yurex_driver);
533
534MODULE_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");