Version:  2.0.40 2.2.26 2.4.37 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17

Linux/drivers/usb/misc/iowarrior.c

  1 /*
  2  *  Native support for the I/O-Warrior USB devices
  3  *
  4  *  Copyright (c) 2003-2005  Code Mercenaries GmbH
  5  *  written by Christian Lucht <lucht@codemercs.com>
  6  *
  7  *  based on
  8 
  9  *  usb-skeleton.c by Greg Kroah-Hartman  <greg@kroah.com>
 10  *  brlvger.c by Stephane Dalton  <sdalton@videotron.ca>
 11  *           and St�hane Doyon   <s.doyon@videotron.ca>
 12  *
 13  *  Released under the GPLv2.
 14  */
 15 
 16 #include <linux/module.h>
 17 #include <linux/usb.h>
 18 #include <linux/slab.h>
 19 #include <linux/sched.h>
 20 #include <linux/mutex.h>
 21 #include <linux/poll.h>
 22 #include <linux/usb/iowarrior.h>
 23 
 24 /* Version Information */
 25 #define DRIVER_VERSION "v0.4.0"
 26 #define DRIVER_AUTHOR "Christian Lucht <lucht@codemercs.com>"
 27 #define DRIVER_DESC "USB IO-Warrior driver (Linux 2.6.x)"
 28 
 29 #define USB_VENDOR_ID_CODEMERCS         1984
 30 /* low speed iowarrior */
 31 #define USB_DEVICE_ID_CODEMERCS_IOW40   0x1500
 32 #define USB_DEVICE_ID_CODEMERCS_IOW24   0x1501
 33 #define USB_DEVICE_ID_CODEMERCS_IOWPV1  0x1511
 34 #define USB_DEVICE_ID_CODEMERCS_IOWPV2  0x1512
 35 /* full speed iowarrior */
 36 #define USB_DEVICE_ID_CODEMERCS_IOW56   0x1503
 37 
 38 /* Get a minor range for your devices from the usb maintainer */
 39 #ifdef CONFIG_USB_DYNAMIC_MINORS
 40 #define IOWARRIOR_MINOR_BASE    0
 41 #else
 42 #define IOWARRIOR_MINOR_BASE    208     // SKELETON_MINOR_BASE 192 + 16, not official yet
 43 #endif
 44 
 45 /* interrupt input queue size */
 46 #define MAX_INTERRUPT_BUFFER 16
 47 /*
 48    maximum number of urbs that are submitted for writes at the same time,
 49    this applies to the IOWarrior56 only!
 50    IOWarrior24 and IOWarrior40 use synchronous usb_control_msg calls.
 51 */
 52 #define MAX_WRITES_IN_FLIGHT 4
 53 
 54 MODULE_AUTHOR(DRIVER_AUTHOR);
 55 MODULE_DESCRIPTION(DRIVER_DESC);
 56 MODULE_LICENSE("GPL");
 57 
 58 /* Module parameters */
 59 static DEFINE_MUTEX(iowarrior_mutex);
 60 
 61 static struct usb_driver iowarrior_driver;
 62 static DEFINE_MUTEX(iowarrior_open_disc_lock);
 63 
 64 /*--------------*/
 65 /*     data     */
 66 /*--------------*/
 67 
 68 /* Structure to hold all of our device specific stuff */
 69 struct iowarrior {
 70         struct mutex mutex;                     /* locks this structure */
 71         struct usb_device *udev;                /* save off the usb device pointer */
 72         struct usb_interface *interface;        /* the interface for this device */
 73         unsigned char minor;                    /* the starting minor number for this device */
 74         struct usb_endpoint_descriptor *int_out_endpoint;       /* endpoint for reading (needed for IOW56 only) */
 75         struct usb_endpoint_descriptor *int_in_endpoint;        /* endpoint for reading */
 76         struct urb *int_in_urb;         /* the urb for reading data */
 77         unsigned char *int_in_buffer;   /* buffer for data to be read */
 78         unsigned char serial_number;    /* to detect lost packages */
 79         unsigned char *read_queue;      /* size is MAX_INTERRUPT_BUFFER * packet size */
 80         wait_queue_head_t read_wait;
 81         wait_queue_head_t write_wait;   /* wait-queue for writing to the device */
 82         atomic_t write_busy;            /* number of write-urbs submitted */
 83         atomic_t read_idx;
 84         atomic_t intr_idx;
 85         spinlock_t intr_idx_lock;       /* protects intr_idx */
 86         atomic_t overflow_flag;         /* signals an index 'rollover' */
 87         int present;                    /* this is 1 as long as the device is connected */
 88         int opened;                     /* this is 1 if the device is currently open */
 89         char chip_serial[9];            /* the serial number string of the chip connected */
 90         int report_size;                /* number of bytes in a report */
 91         u16 product_id;
 92 };
 93 
 94 /*--------------*/
 95 /*    globals   */
 96 /*--------------*/
 97 
 98 /*
 99  *  USB spec identifies 5 second timeouts.
100  */
101 #define GET_TIMEOUT 5
102 #define USB_REQ_GET_REPORT  0x01
103 //#if 0
104 static int usb_get_report(struct usb_device *dev,
105                           struct usb_host_interface *inter, unsigned char type,
106                           unsigned char id, void *buf, int size)
107 {
108         return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
109                                USB_REQ_GET_REPORT,
110                                USB_DIR_IN | USB_TYPE_CLASS |
111                                USB_RECIP_INTERFACE, (type << 8) + id,
112                                inter->desc.bInterfaceNumber, buf, size,
113                                GET_TIMEOUT*HZ);
114 }
115 //#endif
116 
117 #define USB_REQ_SET_REPORT 0x09
118 
119 static int usb_set_report(struct usb_interface *intf, unsigned char type,
120                           unsigned char id, void *buf, int size)
121 {
122         return usb_control_msg(interface_to_usbdev(intf),
123                                usb_sndctrlpipe(interface_to_usbdev(intf), 0),
124                                USB_REQ_SET_REPORT,
125                                USB_TYPE_CLASS | USB_RECIP_INTERFACE,
126                                (type << 8) + id,
127                                intf->cur_altsetting->desc.bInterfaceNumber, buf,
128                                size, HZ);
129 }
130 
131 /*---------------------*/
132 /* driver registration */
133 /*---------------------*/
134 /* table of devices that work with this driver */
135 static const struct usb_device_id iowarrior_ids[] = {
136         {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW40)},
137         {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW24)},
138         {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOWPV1)},
139         {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOWPV2)},
140         {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW56)},
141         {}                      /* Terminating entry */
142 };
143 MODULE_DEVICE_TABLE(usb, iowarrior_ids);
144 
145 /*
146  * USB callback handler for reading data
147  */
148 static void iowarrior_callback(struct urb *urb)
149 {
150         struct iowarrior *dev = urb->context;
151         int intr_idx;
152         int read_idx;
153         int aux_idx;
154         int offset;
155         int status = urb->status;
156         int retval;
157 
158         switch (status) {
159         case 0:
160                 /* success */
161                 break;
162         case -ECONNRESET:
163         case -ENOENT:
164         case -ESHUTDOWN:
165                 return;
166         default:
167                 goto exit;
168         }
169 
170         spin_lock(&dev->intr_idx_lock);
171         intr_idx = atomic_read(&dev->intr_idx);
172         /* aux_idx become previous intr_idx */
173         aux_idx = (intr_idx == 0) ? (MAX_INTERRUPT_BUFFER - 1) : (intr_idx - 1);
174         read_idx = atomic_read(&dev->read_idx);
175 
176         /* queue is not empty and it's interface 0 */
177         if ((intr_idx != read_idx)
178             && (dev->interface->cur_altsetting->desc.bInterfaceNumber == 0)) {
179                 /* + 1 for serial number */
180                 offset = aux_idx * (dev->report_size + 1);
181                 if (!memcmp
182                     (dev->read_queue + offset, urb->transfer_buffer,
183                      dev->report_size)) {
184                         /* equal values on interface 0 will be ignored */
185                         spin_unlock(&dev->intr_idx_lock);
186                         goto exit;
187                 }
188         }
189 
190         /* aux_idx become next intr_idx */
191         aux_idx = (intr_idx == (MAX_INTERRUPT_BUFFER - 1)) ? 0 : (intr_idx + 1);
192         if (read_idx == aux_idx) {
193                 /* queue full, dropping oldest input */
194                 read_idx = (++read_idx == MAX_INTERRUPT_BUFFER) ? 0 : read_idx;
195                 atomic_set(&dev->read_idx, read_idx);
196                 atomic_set(&dev->overflow_flag, 1);
197         }
198 
199         /* +1 for serial number */
200         offset = intr_idx * (dev->report_size + 1);
201         memcpy(dev->read_queue + offset, urb->transfer_buffer,
202                dev->report_size);
203         *(dev->read_queue + offset + (dev->report_size)) = dev->serial_number++;
204 
205         atomic_set(&dev->intr_idx, aux_idx);
206         spin_unlock(&dev->intr_idx_lock);
207         /* tell the blocking read about the new data */
208         wake_up_interruptible(&dev->read_wait);
209 
210 exit:
211         retval = usb_submit_urb(urb, GFP_ATOMIC);
212         if (retval)
213                 dev_err(&dev->interface->dev, "%s - usb_submit_urb failed with result %d\n",
214                         __func__, retval);
215 
216 }
217 
218 /*
219  * USB Callback handler for write-ops
220  */
221 static void iowarrior_write_callback(struct urb *urb)
222 {
223         struct iowarrior *dev;
224         int status = urb->status;
225 
226         dev = urb->context;
227         /* sync/async unlink faults aren't errors */
228         if (status &&
229             !(status == -ENOENT ||
230               status == -ECONNRESET || status == -ESHUTDOWN)) {
231                 dev_dbg(&dev->interface->dev,
232                         "nonzero write bulk status received: %d\n", status);
233         }
234         /* free up our allocated buffer */
235         usb_free_coherent(urb->dev, urb->transfer_buffer_length,
236                           urb->transfer_buffer, urb->transfer_dma);
237         /* tell a waiting writer the interrupt-out-pipe is available again */
238         atomic_dec(&dev->write_busy);
239         wake_up_interruptible(&dev->write_wait);
240 }
241 
242 /**
243  *      iowarrior_delete
244  */
245 static inline void iowarrior_delete(struct iowarrior *dev)
246 {
247         dev_dbg(&dev->interface->dev, "minor %d\n", dev->minor);
248         kfree(dev->int_in_buffer);
249         usb_free_urb(dev->int_in_urb);
250         kfree(dev->read_queue);
251         kfree(dev);
252 }
253 
254 /*---------------------*/
255 /* fops implementation */
256 /*---------------------*/
257 
258 static int read_index(struct iowarrior *dev)
259 {
260         int intr_idx, read_idx;
261 
262         read_idx = atomic_read(&dev->read_idx);
263         intr_idx = atomic_read(&dev->intr_idx);
264 
265         return (read_idx == intr_idx ? -1 : read_idx);
266 }
267 
268 /**
269  *  iowarrior_read
270  */
271 static ssize_t iowarrior_read(struct file *file, char __user *buffer,
272                               size_t count, loff_t *ppos)
273 {
274         struct iowarrior *dev;
275         int read_idx;
276         int offset;
277 
278         dev = file->private_data;
279 
280         /* verify that the device wasn't unplugged */
281         if (dev == NULL || !dev->present)
282                 return -ENODEV;
283 
284         dev_dbg(&dev->interface->dev, "minor %d, count = %zd\n",
285                 dev->minor, count);
286 
287         /* read count must be packet size (+ time stamp) */
288         if ((count != dev->report_size)
289             && (count != (dev->report_size + 1)))
290                 return -EINVAL;
291 
292         /* repeat until no buffer overrun in callback handler occur */
293         do {
294                 atomic_set(&dev->overflow_flag, 0);
295                 if ((read_idx = read_index(dev)) == -1) {
296                         /* queue empty */
297                         if (file->f_flags & O_NONBLOCK)
298                                 return -EAGAIN;
299                         else {
300                                 //next line will return when there is either new data, or the device is unplugged
301                                 int r = wait_event_interruptible(dev->read_wait,
302                                                                  (!dev->present
303                                                                   || (read_idx =
304                                                                       read_index
305                                                                       (dev)) !=
306                                                                   -1));
307                                 if (r) {
308                                         //we were interrupted by a signal
309                                         return -ERESTART;
310                                 }
311                                 if (!dev->present) {
312                                         //The device was unplugged
313                                         return -ENODEV;
314                                 }
315                                 if (read_idx == -1) {
316                                         // Can this happen ???
317                                         return 0;
318                                 }
319                         }
320                 }
321 
322                 offset = read_idx * (dev->report_size + 1);
323                 if (copy_to_user(buffer, dev->read_queue + offset, count)) {
324                         return -EFAULT;
325                 }
326         } while (atomic_read(&dev->overflow_flag));
327 
328         read_idx = ++read_idx == MAX_INTERRUPT_BUFFER ? 0 : read_idx;
329         atomic_set(&dev->read_idx, read_idx);
330         return count;
331 }
332 
333 /*
334  * iowarrior_write
335  */
336 static ssize_t iowarrior_write(struct file *file,
337                                const char __user *user_buffer,
338                                size_t count, loff_t *ppos)
339 {
340         struct iowarrior *dev;
341         int retval = 0;
342         char *buf = NULL;       /* for IOW24 and IOW56 we need a buffer */
343         struct urb *int_out_urb = NULL;
344 
345         dev = file->private_data;
346 
347         mutex_lock(&dev->mutex);
348         /* verify that the device wasn't unplugged */
349         if (!dev->present) {
350                 retval = -ENODEV;
351                 goto exit;
352         }
353         dev_dbg(&dev->interface->dev, "minor %d, count = %zd\n",
354                 dev->minor, count);
355         /* if count is 0 we're already done */
356         if (count == 0) {
357                 retval = 0;
358                 goto exit;
359         }
360         /* We only accept full reports */
361         if (count != dev->report_size) {
362                 retval = -EINVAL;
363                 goto exit;
364         }
365         switch (dev->product_id) {
366         case USB_DEVICE_ID_CODEMERCS_IOW24:
367         case USB_DEVICE_ID_CODEMERCS_IOWPV1:
368         case USB_DEVICE_ID_CODEMERCS_IOWPV2:
369         case USB_DEVICE_ID_CODEMERCS_IOW40:
370                 /* IOW24 and IOW40 use a synchronous call */
371                 buf = kmalloc(count, GFP_KERNEL);
372                 if (!buf) {
373                         retval = -ENOMEM;
374                         goto exit;
375                 }
376                 if (copy_from_user(buf, user_buffer, count)) {
377                         retval = -EFAULT;
378                         kfree(buf);
379                         goto exit;
380                 }
381                 retval = usb_set_report(dev->interface, 2, 0, buf, count);
382                 kfree(buf);
383                 goto exit;
384                 break;
385         case USB_DEVICE_ID_CODEMERCS_IOW56:
386                 /* The IOW56 uses asynchronous IO and more urbs */
387                 if (atomic_read(&dev->write_busy) == MAX_WRITES_IN_FLIGHT) {
388                         /* Wait until we are below the limit for submitted urbs */
389                         if (file->f_flags & O_NONBLOCK) {
390                                 retval = -EAGAIN;
391                                 goto exit;
392                         } else {
393                                 retval = wait_event_interruptible(dev->write_wait,
394                                                                   (!dev->present || (atomic_read (&dev-> write_busy) < MAX_WRITES_IN_FLIGHT)));
395                                 if (retval) {
396                                         /* we were interrupted by a signal */
397                                         retval = -ERESTART;
398                                         goto exit;
399                                 }
400                                 if (!dev->present) {
401                                         /* The device was unplugged */
402                                         retval = -ENODEV;
403                                         goto exit;
404                                 }
405                                 if (!dev->opened) {
406                                         /* We were closed while waiting for an URB */
407                                         retval = -ENODEV;
408                                         goto exit;
409                                 }
410                         }
411                 }
412                 atomic_inc(&dev->write_busy);
413                 int_out_urb = usb_alloc_urb(0, GFP_KERNEL);
414                 if (!int_out_urb) {
415                         retval = -ENOMEM;
416                         dev_dbg(&dev->interface->dev,
417                                 "Unable to allocate urb\n");
418                         goto error_no_urb;
419                 }
420                 buf = usb_alloc_coherent(dev->udev, dev->report_size,
421                                          GFP_KERNEL, &int_out_urb->transfer_dma);
422                 if (!buf) {
423                         retval = -ENOMEM;
424                         dev_dbg(&dev->interface->dev,
425                                 "Unable to allocate buffer\n");
426                         goto error_no_buffer;
427                 }
428                 usb_fill_int_urb(int_out_urb, dev->udev,
429                                  usb_sndintpipe(dev->udev,
430                                                 dev->int_out_endpoint->bEndpointAddress),
431                                  buf, dev->report_size,
432                                  iowarrior_write_callback, dev,
433                                  dev->int_out_endpoint->bInterval);
434                 int_out_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
435                 if (copy_from_user(buf, user_buffer, count)) {
436                         retval = -EFAULT;
437                         goto error;
438                 }
439                 retval = usb_submit_urb(int_out_urb, GFP_KERNEL);
440                 if (retval) {
441                         dev_dbg(&dev->interface->dev,
442                                 "submit error %d for urb nr.%d\n",
443                                 retval, atomic_read(&dev->write_busy));
444                         goto error;
445                 }
446                 /* submit was ok */
447                 retval = count;
448                 usb_free_urb(int_out_urb);
449                 goto exit;
450                 break;
451         default:
452                 /* what do we have here ? An unsupported Product-ID ? */
453                 dev_err(&dev->interface->dev, "%s - not supported for product=0x%x\n",
454                         __func__, dev->product_id);
455                 retval = -EFAULT;
456                 goto exit;
457                 break;
458         }
459 error:
460         usb_free_coherent(dev->udev, dev->report_size, buf,
461                           int_out_urb->transfer_dma);
462 error_no_buffer:
463         usb_free_urb(int_out_urb);
464 error_no_urb:
465         atomic_dec(&dev->write_busy);
466         wake_up_interruptible(&dev->write_wait);
467 exit:
468         mutex_unlock(&dev->mutex);
469         return retval;
470 }
471 
472 /**
473  *      iowarrior_ioctl
474  */
475 static long iowarrior_ioctl(struct file *file, unsigned int cmd,
476                                                         unsigned long arg)
477 {
478         struct iowarrior *dev = NULL;
479         __u8 *buffer;
480         __u8 __user *user_buffer;
481         int retval;
482         int io_res;             /* checks for bytes read/written and copy_to/from_user results */
483 
484         dev = file->private_data;
485         if (dev == NULL) {
486                 return -ENODEV;
487         }
488 
489         buffer = kzalloc(dev->report_size, GFP_KERNEL);
490         if (!buffer)
491                 return -ENOMEM;
492 
493         /* lock this object */
494         mutex_lock(&iowarrior_mutex);
495         mutex_lock(&dev->mutex);
496 
497         /* verify that the device wasn't unplugged */
498         if (!dev->present) {
499                 retval = -ENODEV;
500                 goto error_out;
501         }
502 
503         dev_dbg(&dev->interface->dev, "minor %d, cmd 0x%.4x, arg %ld\n",
504                 dev->minor, cmd, arg);
505 
506         retval = 0;
507         io_res = 0;
508         switch (cmd) {
509         case IOW_WRITE:
510                 if (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW24 ||
511                     dev->product_id == USB_DEVICE_ID_CODEMERCS_IOWPV1 ||
512                     dev->product_id == USB_DEVICE_ID_CODEMERCS_IOWPV2 ||
513                     dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW40) {
514                         user_buffer = (__u8 __user *)arg;
515                         io_res = copy_from_user(buffer, user_buffer,
516                                                 dev->report_size);
517                         if (io_res) {
518                                 retval = -EFAULT;
519                         } else {
520                                 io_res = usb_set_report(dev->interface, 2, 0,
521                                                         buffer,
522                                                         dev->report_size);
523                                 if (io_res < 0)
524                                         retval = io_res;
525                         }
526                 } else {
527                         retval = -EINVAL;
528                         dev_err(&dev->interface->dev,
529                                 "ioctl 'IOW_WRITE' is not supported for product=0x%x.\n",
530                                 dev->product_id);
531                 }
532                 break;
533         case IOW_READ:
534                 user_buffer = (__u8 __user *)arg;
535                 io_res = usb_get_report(dev->udev,
536                                         dev->interface->cur_altsetting, 1, 0,
537                                         buffer, dev->report_size);
538                 if (io_res < 0)
539                         retval = io_res;
540                 else {
541                         io_res = copy_to_user(user_buffer, buffer, dev->report_size);
542                         if (io_res)
543                                 retval = -EFAULT;
544                 }
545                 break;
546         case IOW_GETINFO:
547                 {
548                         /* Report available information for the device */
549                         struct iowarrior_info info;
550                         /* needed for power consumption */
551                         struct usb_config_descriptor *cfg_descriptor = &dev->udev->actconfig->desc;
552 
553                         memset(&info, 0, sizeof(info));
554                         /* directly from the descriptor */
555                         info.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
556                         info.product = dev->product_id;
557                         info.revision = le16_to_cpu(dev->udev->descriptor.bcdDevice);
558 
559                         /* 0==UNKNOWN, 1==LOW(usb1.1) ,2=FULL(usb1.1), 3=HIGH(usb2.0) */
560                         info.speed = le16_to_cpu(dev->udev->speed);
561                         info.if_num = dev->interface->cur_altsetting->desc.bInterfaceNumber;
562                         info.report_size = dev->report_size;
563 
564                         /* serial number string has been read earlier 8 chars or empty string */
565                         memcpy(info.serial, dev->chip_serial,
566                                sizeof(dev->chip_serial));
567                         if (cfg_descriptor == NULL) {
568                                 info.power = -1;        /* no information available */
569                         } else {
570                                 /* the MaxPower is stored in units of 2mA to make it fit into a byte-value */
571                                 info.power = cfg_descriptor->bMaxPower * 2;
572                         }
573                         io_res = copy_to_user((struct iowarrior_info __user *)arg, &info,
574                                          sizeof(struct iowarrior_info));
575                         if (io_res)
576                                 retval = -EFAULT;
577                         break;
578                 }
579         default:
580                 /* return that we did not understand this ioctl call */
581                 retval = -ENOTTY;
582                 break;
583         }
584 error_out:
585         /* unlock the device */
586         mutex_unlock(&dev->mutex);
587         mutex_unlock(&iowarrior_mutex);
588         kfree(buffer);
589         return retval;
590 }
591 
592 /**
593  *      iowarrior_open
594  */
595 static int iowarrior_open(struct inode *inode, struct file *file)
596 {
597         struct iowarrior *dev = NULL;
598         struct usb_interface *interface;
599         int subminor;
600         int retval = 0;
601 
602         mutex_lock(&iowarrior_mutex);
603         subminor = iminor(inode);
604 
605         interface = usb_find_interface(&iowarrior_driver, subminor);
606         if (!interface) {
607                 mutex_unlock(&iowarrior_mutex);
608                 printk(KERN_ERR "%s - error, can't find device for minor %d\n",
609                        __func__, subminor);
610                 return -ENODEV;
611         }
612 
613         mutex_lock(&iowarrior_open_disc_lock);
614         dev = usb_get_intfdata(interface);
615         if (!dev) {
616                 mutex_unlock(&iowarrior_open_disc_lock);
617                 mutex_unlock(&iowarrior_mutex);
618                 return -ENODEV;
619         }
620 
621         mutex_lock(&dev->mutex);
622         mutex_unlock(&iowarrior_open_disc_lock);
623 
624         /* Only one process can open each device, no sharing. */
625         if (dev->opened) {
626                 retval = -EBUSY;
627                 goto out;
628         }
629 
630         /* setup interrupt handler for receiving values */
631         if ((retval = usb_submit_urb(dev->int_in_urb, GFP_KERNEL)) < 0) {
632                 dev_err(&interface->dev, "Error %d while submitting URB\n", retval);
633                 retval = -EFAULT;
634                 goto out;
635         }
636         /* increment our usage count for the driver */
637         ++dev->opened;
638         /* save our object in the file's private structure */
639         file->private_data = dev;
640         retval = 0;
641 
642 out:
643         mutex_unlock(&dev->mutex);
644         mutex_unlock(&iowarrior_mutex);
645         return retval;
646 }
647 
648 /**
649  *      iowarrior_release
650  */
651 static int iowarrior_release(struct inode *inode, struct file *file)
652 {
653         struct iowarrior *dev;
654         int retval = 0;
655 
656         dev = file->private_data;
657         if (dev == NULL) {
658                 return -ENODEV;
659         }
660 
661         dev_dbg(&dev->interface->dev, "minor %d\n", dev->minor);
662 
663         /* lock our device */
664         mutex_lock(&dev->mutex);
665 
666         if (dev->opened <= 0) {
667                 retval = -ENODEV;       /* close called more than once */
668                 mutex_unlock(&dev->mutex);
669         } else {
670                 dev->opened = 0;        /* we're closing now */
671                 retval = 0;
672                 if (dev->present) {
673                         /*
674                            The device is still connected so we only shutdown
675                            pending read-/write-ops.
676                          */
677                         usb_kill_urb(dev->int_in_urb);
678                         wake_up_interruptible(&dev->read_wait);
679                         wake_up_interruptible(&dev->write_wait);
680                         mutex_unlock(&dev->mutex);
681                 } else {
682                         /* The device was unplugged, cleanup resources */
683                         mutex_unlock(&dev->mutex);
684                         iowarrior_delete(dev);
685                 }
686         }
687         return retval;
688 }
689 
690 static unsigned iowarrior_poll(struct file *file, poll_table * wait)
691 {
692         struct iowarrior *dev = file->private_data;
693         unsigned int mask = 0;
694 
695         if (!dev->present)
696                 return POLLERR | POLLHUP;
697 
698         poll_wait(file, &dev->read_wait, wait);
699         poll_wait(file, &dev->write_wait, wait);
700 
701         if (!dev->present)
702                 return POLLERR | POLLHUP;
703 
704         if (read_index(dev) != -1)
705                 mask |= POLLIN | POLLRDNORM;
706 
707         if (atomic_read(&dev->write_busy) < MAX_WRITES_IN_FLIGHT)
708                 mask |= POLLOUT | POLLWRNORM;
709         return mask;
710 }
711 
712 /*
713  * File operations needed when we register this driver.
714  * This assumes that this driver NEEDS file operations,
715  * of course, which means that the driver is expected
716  * to have a node in the /dev directory. If the USB
717  * device were for a network interface then the driver
718  * would use "struct net_driver" instead, and a serial
719  * device would use "struct tty_driver".
720  */
721 static const struct file_operations iowarrior_fops = {
722         .owner = THIS_MODULE,
723         .write = iowarrior_write,
724         .read = iowarrior_read,
725         .unlocked_ioctl = iowarrior_ioctl,
726         .open = iowarrior_open,
727         .release = iowarrior_release,
728         .poll = iowarrior_poll,
729         .llseek = noop_llseek,
730 };
731 
732 static char *iowarrior_devnode(struct device *dev, umode_t *mode)
733 {
734         return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev));
735 }
736 
737 /*
738  * usb class driver info in order to get a minor number from the usb core,
739  * and to have the device registered with devfs and the driver core
740  */
741 static struct usb_class_driver iowarrior_class = {
742         .name = "iowarrior%d",
743         .devnode = iowarrior_devnode,
744         .fops = &iowarrior_fops,
745         .minor_base = IOWARRIOR_MINOR_BASE,
746 };
747 
748 /*---------------------------------*/
749 /*  probe and disconnect functions */
750 /*---------------------------------*/
751 /**
752  *      iowarrior_probe
753  *
754  *      Called by the usb core when a new device is connected that it thinks
755  *      this driver might be interested in.
756  */
757 static int iowarrior_probe(struct usb_interface *interface,
758                            const struct usb_device_id *id)
759 {
760         struct usb_device *udev = interface_to_usbdev(interface);
761         struct iowarrior *dev = NULL;
762         struct usb_host_interface *iface_desc;
763         struct usb_endpoint_descriptor *endpoint;
764         int i;
765         int retval = -ENOMEM;
766 
767         /* allocate memory for our device state and initialize it */
768         dev = kzalloc(sizeof(struct iowarrior), GFP_KERNEL);
769         if (dev == NULL) {
770                 dev_err(&interface->dev, "Out of memory\n");
771                 return retval;
772         }
773 
774         mutex_init(&dev->mutex);
775 
776         atomic_set(&dev->intr_idx, 0);
777         atomic_set(&dev->read_idx, 0);
778         spin_lock_init(&dev->intr_idx_lock);
779         atomic_set(&dev->overflow_flag, 0);
780         init_waitqueue_head(&dev->read_wait);
781         atomic_set(&dev->write_busy, 0);
782         init_waitqueue_head(&dev->write_wait);
783 
784         dev->udev = udev;
785         dev->interface = interface;
786 
787         iface_desc = interface->cur_altsetting;
788         dev->product_id = le16_to_cpu(udev->descriptor.idProduct);
789 
790         /* set up the endpoint information */
791         for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
792                 endpoint = &iface_desc->endpoint[i].desc;
793 
794                 if (usb_endpoint_is_int_in(endpoint))
795                         dev->int_in_endpoint = endpoint;
796                 if (usb_endpoint_is_int_out(endpoint))
797                         /* this one will match for the IOWarrior56 only */
798                         dev->int_out_endpoint = endpoint;
799         }
800         /* we have to check the report_size often, so remember it in the endianness suitable for our machine */
801         dev->report_size = usb_endpoint_maxp(dev->int_in_endpoint);
802         if ((dev->interface->cur_altsetting->desc.bInterfaceNumber == 0) &&
803             (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW56))
804                 /* IOWarrior56 has wMaxPacketSize different from report size */
805                 dev->report_size = 7;
806 
807         /* create the urb and buffer for reading */
808         dev->int_in_urb = usb_alloc_urb(0, GFP_KERNEL);
809         if (!dev->int_in_urb) {
810                 dev_err(&interface->dev, "Couldn't allocate interrupt_in_urb\n");
811                 goto error;
812         }
813         dev->int_in_buffer = kmalloc(dev->report_size, GFP_KERNEL);
814         if (!dev->int_in_buffer) {
815                 dev_err(&interface->dev, "Couldn't allocate int_in_buffer\n");
816                 goto error;
817         }
818         usb_fill_int_urb(dev->int_in_urb, dev->udev,
819                          usb_rcvintpipe(dev->udev,
820                                         dev->int_in_endpoint->bEndpointAddress),
821                          dev->int_in_buffer, dev->report_size,
822                          iowarrior_callback, dev,
823                          dev->int_in_endpoint->bInterval);
824         /* create an internal buffer for interrupt data from the device */
825         dev->read_queue =
826             kmalloc(((dev->report_size + 1) * MAX_INTERRUPT_BUFFER),
827                     GFP_KERNEL);
828         if (!dev->read_queue) {
829                 dev_err(&interface->dev, "Couldn't allocate read_queue\n");
830                 goto error;
831         }
832         /* Get the serial-number of the chip */
833         memset(dev->chip_serial, 0x00, sizeof(dev->chip_serial));
834         usb_string(udev, udev->descriptor.iSerialNumber, dev->chip_serial,
835                    sizeof(dev->chip_serial));
836         if (strlen(dev->chip_serial) != 8)
837                 memset(dev->chip_serial, 0x00, sizeof(dev->chip_serial));
838 
839         /* Set the idle timeout to 0, if this is interface 0 */
840         if (dev->interface->cur_altsetting->desc.bInterfaceNumber == 0) {
841             usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
842                             0x0A,
843                             USB_TYPE_CLASS | USB_RECIP_INTERFACE, 0,
844                             0, NULL, 0, USB_CTRL_SET_TIMEOUT);
845         }
846         /* allow device read and ioctl */
847         dev->present = 1;
848 
849         /* we can register the device now, as it is ready */
850         usb_set_intfdata(interface, dev);
851 
852         retval = usb_register_dev(interface, &iowarrior_class);
853         if (retval) {
854                 /* something prevented us from registering this driver */
855                 dev_err(&interface->dev, "Not able to get a minor for this device.\n");
856                 usb_set_intfdata(interface, NULL);
857                 goto error;
858         }
859 
860         dev->minor = interface->minor;
861 
862         /* let the user know what node this device is now attached to */
863         dev_info(&interface->dev, "IOWarrior product=0x%x, serial=%s interface=%d "
864                  "now attached to iowarrior%d\n", dev->product_id, dev->chip_serial,
865                  iface_desc->desc.bInterfaceNumber, dev->minor - IOWARRIOR_MINOR_BASE);
866         return retval;
867 
868 error:
869         iowarrior_delete(dev);
870         return retval;
871 }
872 
873 /**
874  *      iowarrior_disconnect
875  *
876  *      Called by the usb core when the device is removed from the system.
877  */
878 static void iowarrior_disconnect(struct usb_interface *interface)
879 {
880         struct iowarrior *dev;
881         int minor;
882 
883         dev = usb_get_intfdata(interface);
884         mutex_lock(&iowarrior_open_disc_lock);
885         usb_set_intfdata(interface, NULL);
886 
887         minor = dev->minor;
888 
889         /* give back our minor */
890         usb_deregister_dev(interface, &iowarrior_class);
891 
892         mutex_lock(&dev->mutex);
893 
894         /* prevent device read, write and ioctl */
895         dev->present = 0;
896 
897         mutex_unlock(&dev->mutex);
898         mutex_unlock(&iowarrior_open_disc_lock);
899 
900         if (dev->opened) {
901                 /* There is a process that holds a filedescriptor to the device ,
902                    so we only shutdown read-/write-ops going on.
903                    Deleting the device is postponed until close() was called.
904                  */
905                 usb_kill_urb(dev->int_in_urb);
906                 wake_up_interruptible(&dev->read_wait);
907                 wake_up_interruptible(&dev->write_wait);
908         } else {
909                 /* no process is using the device, cleanup now */
910                 iowarrior_delete(dev);
911         }
912 
913         dev_info(&interface->dev, "I/O-Warror #%d now disconnected\n",
914                  minor - IOWARRIOR_MINOR_BASE);
915 }
916 
917 /* usb specific object needed to register this driver with the usb subsystem */
918 static struct usb_driver iowarrior_driver = {
919         .name = "iowarrior",
920         .probe = iowarrior_probe,
921         .disconnect = iowarrior_disconnect,
922         .id_table = iowarrior_ids,
923 };
924 
925 module_usb_driver(iowarrior_driver);
926 

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