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Linux/drivers/usb/misc/yurex.c

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

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