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spi: spi-fsl-qspi: Fix return value check of devm_ioremap() in probe
[linux/fpc-iii.git] / drivers / usb / misc / iowarrior.c
blobdce20301e367a617277d1ae0f2489f220c4f9ee4
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Native support for the I/O-Warrior USB devices
4 *
5 * Copyright (c) 2003-2005 Code Mercenaries GmbH
6 * written by Christian Lucht <lucht@codemercs.com>
7 *
8 * based on
9
10 * usb-skeleton.c by Greg Kroah-Hartman <greg@kroah.com>
11 * brlvger.c by Stephane Dalton <sdalton@videotron.ca>
12 * and St�hane Doyon <s.doyon@videotron.ca>
13 *
14 * Released under the GPLv2.
15 */
16
17 #include <linux/module.h>
18 #include <linux/usb.h>
19 #include <linux/slab.h>
20 #include <linux/sched.h>
21 #include <linux/mutex.h>
22 #include <linux/poll.h>
23 #include <linux/usb/iowarrior.h>
24
25 #define DRIVER_AUTHOR "Christian Lucht <lucht@codemercs.com>"
26 #define DRIVER_DESC "USB IO-Warrior driver"
27
28 #define USB_VENDOR_ID_CODEMERCS 1984
29 /* low speed iowarrior */
30 #define USB_DEVICE_ID_CODEMERCS_IOW40 0x1500
31 #define USB_DEVICE_ID_CODEMERCS_IOW24 0x1501
32 #define USB_DEVICE_ID_CODEMERCS_IOWPV1 0x1511
33 #define USB_DEVICE_ID_CODEMERCS_IOWPV2 0x1512
34 /* full speed iowarrior */
35 #define USB_DEVICE_ID_CODEMERCS_IOW56 0x1503
36 /* fuller speed iowarrior */
37 #define USB_DEVICE_ID_CODEMERCS_IOW28 0x1504
38 #define USB_DEVICE_ID_CODEMERCS_IOW28L 0x1505
39 #define USB_DEVICE_ID_CODEMERCS_IOW100 0x1506
40
41 /* OEMed devices */
42 #define USB_DEVICE_ID_CODEMERCS_IOW24SAG 0x158a
43 #define USB_DEVICE_ID_CODEMERCS_IOW56AM 0x158b
44
45 /* Get a minor range for your devices from the usb maintainer */
46 #ifdef CONFIG_USB_DYNAMIC_MINORS
47 #define IOWARRIOR_MINOR_BASE 0
48 #else
49 #define IOWARRIOR_MINOR_BASE 208 // SKELETON_MINOR_BASE 192 + 16, not official yet
50 #endif
51
52 /* interrupt input queue size */
53 #define MAX_INTERRUPT_BUFFER 16
54 /*
55 maximum number of urbs that are submitted for writes at the same time,
56 this applies to the IOWarrior56 only!
57 IOWarrior24 and IOWarrior40 use synchronous usb_control_msg calls.
58 */
59 #define MAX_WRITES_IN_FLIGHT 4
60
61 MODULE_AUTHOR(DRIVER_AUTHOR);
62 MODULE_DESCRIPTION(DRIVER_DESC);
63 MODULE_LICENSE("GPL");
64
65 static struct usb_driver iowarrior_driver;
66
67 /*--------------*/
68 /* data */
69 /*--------------*/
70
71 /* Structure to hold all of our device specific stuff */
72 struct iowarrior {
73 struct mutex mutex; /* locks this structure */
74 struct usb_device *udev; /* save off the usb device pointer */
75 struct usb_interface *interface; /* the interface for this device */
76 unsigned char minor; /* the starting minor number for this device */
77 struct usb_endpoint_descriptor *int_out_endpoint; /* endpoint for reading (needed for IOW56 only) */
78 struct usb_endpoint_descriptor *int_in_endpoint; /* endpoint for reading */
79 struct urb *int_in_urb; /* the urb for reading data */
80 unsigned char *int_in_buffer; /* buffer for data to be read */
81 unsigned char serial_number; /* to detect lost packages */
82 unsigned char *read_queue; /* size is MAX_INTERRUPT_BUFFER * packet size */
83 wait_queue_head_t read_wait;
84 wait_queue_head_t write_wait; /* wait-queue for writing to the device */
85 atomic_t write_busy; /* number of write-urbs submitted */
86 atomic_t read_idx;
87 atomic_t intr_idx;
88 atomic_t overflow_flag; /* signals an index 'rollover' */
89 int present; /* this is 1 as long as the device is connected */
90 int opened; /* this is 1 if the device is currently open */
91 char chip_serial[9]; /* the serial number string of the chip connected */
92 int report_size; /* number of bytes in a report */
93 u16 product_id;
94 struct usb_anchor submitted;
95 };
96
97 /*--------------*/
98 /* globals */
99 /*--------------*/
100
101 /*
102 * USB spec identifies 5 second timeouts.
103 */
104 #define GET_TIMEOUT 5
105 #define USB_REQ_GET_REPORT 0x01
106 //#if 0
107 static int usb_get_report(struct usb_device *dev,
108 struct usb_host_interface *inter, unsigned char type,
109 unsigned char id, void *buf, int size)
110 {
111 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
112 USB_REQ_GET_REPORT,
113 USB_DIR_IN | USB_TYPE_CLASS |
114 USB_RECIP_INTERFACE, (type << 8) + id,
115 inter->desc.bInterfaceNumber, buf, size,
116 GET_TIMEOUT*HZ);
117 }
118 //#endif
119
120 #define USB_REQ_SET_REPORT 0x09
121
122 static int usb_set_report(struct usb_interface *intf, unsigned char type,
123 unsigned char id, void *buf, int size)
124 {
125 return usb_control_msg(interface_to_usbdev(intf),
126 usb_sndctrlpipe(interface_to_usbdev(intf), 0),
127 USB_REQ_SET_REPORT,
128 USB_TYPE_CLASS | USB_RECIP_INTERFACE,
129 (type << 8) + id,
130 intf->cur_altsetting->desc.bInterfaceNumber, buf,
131 size, HZ);
132 }
133
134 /*---------------------*/
135 /* driver registration */
136 /*---------------------*/
137 /* table of devices that work with this driver */
138 static const struct usb_device_id iowarrior_ids[] = {
139 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW40)},
140 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW24)},
141 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOWPV1)},
142 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOWPV2)},
143 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW56)},
144 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW24SAG)},
145 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW56AM)},
146 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW28)},
147 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW28L)},
148 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW100)},
149 {} /* Terminating entry */
150 };
151 MODULE_DEVICE_TABLE(usb, iowarrior_ids);
152
153 /*
154 * USB callback handler for reading data
155 */
156 static void iowarrior_callback(struct urb *urb)
157 {
158 struct iowarrior *dev = urb->context;
159 int intr_idx;
160 int read_idx;
161 int aux_idx;
162 int offset;
163 int status = urb->status;
164 int retval;
165
166 switch (status) {
167 case 0:
168 /* success */
169 break;
170 case -ECONNRESET:
171 case -ENOENT:
172 case -ESHUTDOWN:
173 return;
174 default:
175 goto exit;
176 }
177
178 intr_idx = atomic_read(&dev->intr_idx);
179 /* aux_idx become previous intr_idx */
180 aux_idx = (intr_idx == 0) ? (MAX_INTERRUPT_BUFFER - 1) : (intr_idx - 1);
181 read_idx = atomic_read(&dev->read_idx);
182
183 /* queue is not empty and it's interface 0 */
184 if ((intr_idx != read_idx)
185 && (dev->interface->cur_altsetting->desc.bInterfaceNumber == 0)) {
186 /* + 1 for serial number */
187 offset = aux_idx * (dev->report_size + 1);
188 if (!memcmp
189 (dev->read_queue + offset, urb->transfer_buffer,
190 dev->report_size)) {
191 /* equal values on interface 0 will be ignored */
192 goto exit;
193 }
194 }
195
196 /* aux_idx become next intr_idx */
197 aux_idx = (intr_idx == (MAX_INTERRUPT_BUFFER - 1)) ? 0 : (intr_idx + 1);
198 if (read_idx == aux_idx) {
199 /* queue full, dropping oldest input */
200 read_idx = (++read_idx == MAX_INTERRUPT_BUFFER) ? 0 : read_idx;
201 atomic_set(&dev->read_idx, read_idx);
202 atomic_set(&dev->overflow_flag, 1);
203 }
204
205 /* +1 for serial number */
206 offset = intr_idx * (dev->report_size + 1);
207 memcpy(dev->read_queue + offset, urb->transfer_buffer,
208 dev->report_size);
209 *(dev->read_queue + offset + (dev->report_size)) = dev->serial_number++;
210
211 atomic_set(&dev->intr_idx, aux_idx);
212 /* tell the blocking read about the new data */
213 wake_up_interruptible(&dev->read_wait);
214
215 exit:
216 retval = usb_submit_urb(urb, GFP_ATOMIC);
217 if (retval)
218 dev_err(&dev->interface->dev, "%s - usb_submit_urb failed with result %d\n",
219 __func__, retval);
220
221 }
222
223 /*
224 * USB Callback handler for write-ops
225 */
226 static void iowarrior_write_callback(struct urb *urb)
227 {
228 struct iowarrior *dev;
229 int status = urb->status;
230
231 dev = urb->context;
232 /* sync/async unlink faults aren't errors */
233 if (status &&
234 !(status == -ENOENT ||
235 status == -ECONNRESET || status == -ESHUTDOWN)) {
236 dev_dbg(&dev->interface->dev,
237 "nonzero write bulk status received: %d\n", status);
238 }
239 /* free up our allocated buffer */
240 usb_free_coherent(urb->dev, urb->transfer_buffer_length,
241 urb->transfer_buffer, urb->transfer_dma);
242 /* tell a waiting writer the interrupt-out-pipe is available again */
243 atomic_dec(&dev->write_busy);
244 wake_up_interruptible(&dev->write_wait);
245 }
246
247 /**
248 * iowarrior_delete
249 */
250 static inline void iowarrior_delete(struct iowarrior *dev)
251 {
252 dev_dbg(&dev->interface->dev, "minor %d\n", dev->minor);
253 kfree(dev->int_in_buffer);
254 usb_free_urb(dev->int_in_urb);
255 kfree(dev->read_queue);
256 usb_put_intf(dev->interface);
257 kfree(dev);
258 }
259
260 /*---------------------*/
261 /* fops implementation */
262 /*---------------------*/
263
264 static int read_index(struct iowarrior *dev)
265 {
266 int intr_idx, read_idx;
267
268 read_idx = atomic_read(&dev->read_idx);
269 intr_idx = atomic_read(&dev->intr_idx);
270
271 return (read_idx == intr_idx ? -1 : read_idx);
272 }
273
274 /**
275 * iowarrior_read
276 */
277 static ssize_t iowarrior_read(struct file *file, char __user *buffer,
278 size_t count, loff_t *ppos)
279 {
280 struct iowarrior *dev;
281 int read_idx;
282 int offset;
283
284 dev = file->private_data;
285
286 /* verify that the device wasn't unplugged */
287 if (!dev || !dev->present)
288 return -ENODEV;
289
290 dev_dbg(&dev->interface->dev, "minor %d, count = %zd\n",
291 dev->minor, count);
292
293 /* read count must be packet size (+ time stamp) */
294 if ((count != dev->report_size)
295 && (count != (dev->report_size + 1)))
296 return -EINVAL;
297
298 /* repeat until no buffer overrun in callback handler occur */
299 do {
300 atomic_set(&dev->overflow_flag, 0);
301 if ((read_idx = read_index(dev)) == -1) {
302 /* queue empty */
303 if (file->f_flags & O_NONBLOCK)
304 return -EAGAIN;
305 else {
306 //next line will return when there is either new data, or the device is unplugged
307 int r = wait_event_interruptible(dev->read_wait,
308 (!dev->present
309 || (read_idx =
310 read_index
311 (dev)) !=
312 -1));
313 if (r) {
314 //we were interrupted by a signal
315 return -ERESTART;
316 }
317 if (!dev->present) {
318 //The device was unplugged
319 return -ENODEV;
320 }
321 if (read_idx == -1) {
322 // Can this happen ???
323 return 0;
324 }
325 }
326 }
327
328 offset = read_idx * (dev->report_size + 1);
329 if (copy_to_user(buffer, dev->read_queue + offset, count)) {
330 return -EFAULT;
331 }
332 } while (atomic_read(&dev->overflow_flag));
333
334 read_idx = ++read_idx == MAX_INTERRUPT_BUFFER ? 0 : read_idx;
335 atomic_set(&dev->read_idx, read_idx);
336 return count;
337 }
338
339 /*
340 * iowarrior_write
341 */
342 static ssize_t iowarrior_write(struct file *file,
343 const char __user *user_buffer,
344 size_t count, loff_t *ppos)
345 {
346 struct iowarrior *dev;
347 int retval = 0;
348 char *buf = NULL; /* for IOW24 and IOW56 we need a buffer */
349 struct urb *int_out_urb = NULL;
350
351 dev = file->private_data;
352
353 mutex_lock(&dev->mutex);
354 /* verify that the device wasn't unplugged */
355 if (!dev->present) {
356 retval = -ENODEV;
357 goto exit;
358 }
359 dev_dbg(&dev->interface->dev, "minor %d, count = %zd\n",
360 dev->minor, count);
361 /* if count is 0 we're already done */
362 if (count == 0) {
363 retval = 0;
364 goto exit;
365 }
366 /* We only accept full reports */
367 if (count != dev->report_size) {
368 retval = -EINVAL;
369 goto exit;
370 }
371 switch (dev->product_id) {
372 case USB_DEVICE_ID_CODEMERCS_IOW24:
373 case USB_DEVICE_ID_CODEMERCS_IOW24SAG:
374 case USB_DEVICE_ID_CODEMERCS_IOWPV1:
375 case USB_DEVICE_ID_CODEMERCS_IOWPV2:
376 case USB_DEVICE_ID_CODEMERCS_IOW40:
377 /* IOW24 and IOW40 use a synchronous call */
378 buf = memdup_user(user_buffer, count);
379 if (IS_ERR(buf)) {
380 retval = PTR_ERR(buf);
381 goto exit;
382 }
383 retval = usb_set_report(dev->interface, 2, 0, buf, count);
384 kfree(buf);
385 goto exit;
386 break;
387 case USB_DEVICE_ID_CODEMERCS_IOW56:
388 case USB_DEVICE_ID_CODEMERCS_IOW56AM:
389 case USB_DEVICE_ID_CODEMERCS_IOW28:
390 case USB_DEVICE_ID_CODEMERCS_IOW28L:
391 case USB_DEVICE_ID_CODEMERCS_IOW100:
392 /* The IOW56 uses asynchronous IO and more urbs */
393 if (atomic_read(&dev->write_busy) == MAX_WRITES_IN_FLIGHT) {
394 /* Wait until we are below the limit for submitted urbs */
395 if (file->f_flags & O_NONBLOCK) {
396 retval = -EAGAIN;
397 goto exit;
398 } else {
399 retval = wait_event_interruptible(dev->write_wait,
400 (!dev->present || (atomic_read (&dev-> write_busy) < MAX_WRITES_IN_FLIGHT)));
401 if (retval) {
402 /* we were interrupted by a signal */
403 retval = -ERESTART;
404 goto exit;
405 }
406 if (!dev->present) {
407 /* The device was unplugged */
408 retval = -ENODEV;
409 goto exit;
410 }
411 if (!dev->opened) {
412 /* We were closed while waiting for an URB */
413 retval = -ENODEV;
414 goto exit;
415 }
416 }
417 }
418 atomic_inc(&dev->write_busy);
419 int_out_urb = usb_alloc_urb(0, GFP_KERNEL);
420 if (!int_out_urb) {
421 retval = -ENOMEM;
422 goto error_no_urb;
423 }
424 buf = usb_alloc_coherent(dev->udev, dev->report_size,
425 GFP_KERNEL, &int_out_urb->transfer_dma);
426 if (!buf) {
427 retval = -ENOMEM;
428 dev_dbg(&dev->interface->dev,
429 "Unable to allocate buffer\n");
430 goto error_no_buffer;
431 }
432 usb_fill_int_urb(int_out_urb, dev->udev,
433 usb_sndintpipe(dev->udev,
434 dev->int_out_endpoint->bEndpointAddress),
435 buf, dev->report_size,
436 iowarrior_write_callback, dev,
437 dev->int_out_endpoint->bInterval);
438 int_out_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
439 if (copy_from_user(buf, user_buffer, count)) {
440 retval = -EFAULT;
441 goto error;
442 }
443 usb_anchor_urb(int_out_urb, &dev->submitted);
444 retval = usb_submit_urb(int_out_urb, GFP_KERNEL);
445 if (retval) {
446 dev_dbg(&dev->interface->dev,
447 "submit error %d for urb nr.%d\n",
448 retval, atomic_read(&dev->write_busy));
449 usb_unanchor_urb(int_out_urb);
450 goto error;
451 }
452 /* submit was ok */
453 retval = count;
454 usb_free_urb(int_out_urb);
455 goto exit;
456 break;
457 default:
458 /* what do we have here ? An unsupported Product-ID ? */
459 dev_err(&dev->interface->dev, "%s - not supported for product=0x%x\n",
460 __func__, dev->product_id);
461 retval = -EFAULT;
462 goto exit;
463 break;
464 }
465 error:
466 usb_free_coherent(dev->udev, dev->report_size, buf,
467 int_out_urb->transfer_dma);
468 error_no_buffer:
469 usb_free_urb(int_out_urb);
470 error_no_urb:
471 atomic_dec(&dev->write_busy);
472 wake_up_interruptible(&dev->write_wait);
473 exit:
474 mutex_unlock(&dev->mutex);
475 return retval;
476 }
477
478 /**
479 * iowarrior_ioctl
480 */
481 static long iowarrior_ioctl(struct file *file, unsigned int cmd,
482 unsigned long arg)
483 {
484 struct iowarrior *dev = NULL;
485 __u8 *buffer;
486 __u8 __user *user_buffer;
487 int retval;
488 int io_res; /* checks for bytes read/written and copy_to/from_user results */
489
490 dev = file->private_data;
491 if (!dev)
492 return -ENODEV;
493
494 buffer = kzalloc(dev->report_size, GFP_KERNEL);
495 if (!buffer)
496 return -ENOMEM;
497
498 mutex_lock(&dev->mutex);
499
500 /* verify that the device wasn't unplugged */
501 if (!dev->present) {
502 retval = -ENODEV;
503 goto error_out;
504 }
505
506 dev_dbg(&dev->interface->dev, "minor %d, cmd 0x%.4x, arg %ld\n",
507 dev->minor, cmd, arg);
508
509 retval = 0;
510 io_res = 0;
511 switch (cmd) {
512 case IOW_WRITE:
513 if (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW24 ||
514 dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW24SAG ||
515 dev->product_id == USB_DEVICE_ID_CODEMERCS_IOWPV1 ||
516 dev->product_id == USB_DEVICE_ID_CODEMERCS_IOWPV2 ||
517 dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW40) {
518 user_buffer = (__u8 __user *)arg;
519 io_res = copy_from_user(buffer, user_buffer,
520 dev->report_size);
521 if (io_res) {
522 retval = -EFAULT;
523 } else {
524 io_res = usb_set_report(dev->interface, 2, 0,
525 buffer,
526 dev->report_size);
527 if (io_res < 0)
528 retval = io_res;
529 }
530 } else {
531 retval = -EINVAL;
532 dev_err(&dev->interface->dev,
533 "ioctl 'IOW_WRITE' is not supported for product=0x%x.\n",
534 dev->product_id);
535 }
536 break;
537 case IOW_READ:
538 user_buffer = (__u8 __user *)arg;
539 io_res = usb_get_report(dev->udev,
540 dev->interface->cur_altsetting, 1, 0,
541 buffer, dev->report_size);
542 if (io_res < 0)
543 retval = io_res;
544 else {
545 io_res = copy_to_user(user_buffer, buffer, dev->report_size);
546 if (io_res)
547 retval = -EFAULT;
548 }
549 break;
550 case IOW_GETINFO:
551 {
552 /* Report available information for the device */
553 struct iowarrior_info info;
554 /* needed for power consumption */
555 struct usb_config_descriptor *cfg_descriptor = &dev->udev->actconfig->desc;
556
557 memset(&info, 0, sizeof(info));
558 /* directly from the descriptor */
559 info.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
560 info.product = dev->product_id;
561 info.revision = le16_to_cpu(dev->udev->descriptor.bcdDevice);
562
563 /* 0==UNKNOWN, 1==LOW(usb1.1) ,2=FULL(usb1.1), 3=HIGH(usb2.0) */
564 info.speed = dev->udev->speed;
565 info.if_num = dev->interface->cur_altsetting->desc.bInterfaceNumber;
566 info.report_size = dev->report_size;
567
568 /* serial number string has been read earlier 8 chars or empty string */
569 memcpy(info.serial, dev->chip_serial,
570 sizeof(dev->chip_serial));
571 if (cfg_descriptor == NULL) {
572 info.power = -1; /* no information available */
573 } else {
574 /* the MaxPower is stored in units of 2mA to make it fit into a byte-value */
575 info.power = cfg_descriptor->bMaxPower * 2;
576 }
577 io_res = copy_to_user((struct iowarrior_info __user *)arg, &info,
578 sizeof(struct iowarrior_info));
579 if (io_res)
580 retval = -EFAULT;
581 break;
582 }
583 default:
584 /* return that we did not understand this ioctl call */
585 retval = -ENOTTY;
586 break;
587 }
588 error_out:
589 /* unlock the device */
590 mutex_unlock(&dev->mutex);
591 kfree(buffer);
592 return retval;
593 }
594
595 /**
596 * iowarrior_open
597 */
598 static int iowarrior_open(struct inode *inode, struct file *file)
599 {
600 struct iowarrior *dev = NULL;
601 struct usb_interface *interface;
602 int subminor;
603 int retval = 0;
604
605 subminor = iminor(inode);
606
607 interface = usb_find_interface(&iowarrior_driver, subminor);
608 if (!interface) {
609 pr_err("%s - error, can't find device for minor %d\n",
610 __func__, subminor);
611 return -ENODEV;
612 }
613
614 dev = usb_get_intfdata(interface);
615 if (!dev)
616 return -ENODEV;
617
618 mutex_lock(&dev->mutex);
619
620 /* Only one process can open each device, no sharing. */
621 if (dev->opened) {
622 retval = -EBUSY;
623 goto out;
624 }
625
626 /* setup interrupt handler for receiving values */
627 if ((retval = usb_submit_urb(dev->int_in_urb, GFP_KERNEL)) < 0) {
628 dev_err(&interface->dev, "Error %d while submitting URB\n", retval);
629 retval = -EFAULT;
630 goto out;
631 }
632 /* increment our usage count for the driver */
633 ++dev->opened;
634 /* save our object in the file's private structure */
635 file->private_data = dev;
636 retval = 0;
637
638 out:
639 mutex_unlock(&dev->mutex);
640 return retval;
641 }
642
643 /**
644 * iowarrior_release
645 */
646 static int iowarrior_release(struct inode *inode, struct file *file)
647 {
648 struct iowarrior *dev;
649 int retval = 0;
650
651 dev = file->private_data;
652 if (!dev)
653 return -ENODEV;
654
655 dev_dbg(&dev->interface->dev, "minor %d\n", dev->minor);
656
657 /* lock our device */
658 mutex_lock(&dev->mutex);
659
660 if (dev->opened <= 0) {
661 retval = -ENODEV; /* close called more than once */
662 mutex_unlock(&dev->mutex);
663 } else {
664 dev->opened = 0; /* we're closing now */
665 retval = 0;
666 if (dev->present) {
667 /*
668 The device is still connected so we only shutdown
669 pending read-/write-ops.
670 */
671 usb_kill_urb(dev->int_in_urb);
672 wake_up_interruptible(&dev->read_wait);
673 wake_up_interruptible(&dev->write_wait);
674 mutex_unlock(&dev->mutex);
675 } else {
676 /* The device was unplugged, cleanup resources */
677 mutex_unlock(&dev->mutex);
678 iowarrior_delete(dev);
679 }
680 }
681 return retval;
682 }
683
684 static __poll_t iowarrior_poll(struct file *file, poll_table * wait)
685 {
686 struct iowarrior *dev = file->private_data;
687 __poll_t mask = 0;
688
689 if (!dev->present)
690 return EPOLLERR | EPOLLHUP;
691
692 poll_wait(file, &dev->read_wait, wait);
693 poll_wait(file, &dev->write_wait, wait);
694
695 if (!dev->present)
696 return EPOLLERR | EPOLLHUP;
697
698 if (read_index(dev) != -1)
699 mask |= EPOLLIN | EPOLLRDNORM;
700
701 if (atomic_read(&dev->write_busy) < MAX_WRITES_IN_FLIGHT)
702 mask |= EPOLLOUT | EPOLLWRNORM;
703 return mask;
704 }
705
706 /*
707 * File operations needed when we register this driver.
708 * This assumes that this driver NEEDS file operations,
709 * of course, which means that the driver is expected
710 * to have a node in the /dev directory. If the USB
711 * device were for a network interface then the driver
712 * would use "struct net_driver" instead, and a serial
713 * device would use "struct tty_driver".
714 */
715 static const struct file_operations iowarrior_fops = {
716 .owner = THIS_MODULE,
717 .write = iowarrior_write,
718 .read = iowarrior_read,
719 .unlocked_ioctl = iowarrior_ioctl,
720 .open = iowarrior_open,
721 .release = iowarrior_release,
722 .poll = iowarrior_poll,
723 .llseek = noop_llseek,
724 };
725
726 static char *iowarrior_devnode(struct device *dev, umode_t *mode)
727 {
728 return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev));
729 }
730
731 /*
732 * usb class driver info in order to get a minor number from the usb core,
733 * and to have the device registered with devfs and the driver core
734 */
735 static struct usb_class_driver iowarrior_class = {
736 .name = "iowarrior%d",
737 .devnode = iowarrior_devnode,
738 .fops = &iowarrior_fops,
739 .minor_base = IOWARRIOR_MINOR_BASE,
740 };
741
742 /*---------------------------------*/
743 /* probe and disconnect functions */
744 /*---------------------------------*/
745 /**
746 * iowarrior_probe
747 *
748 * Called by the usb core when a new device is connected that it thinks
749 * this driver might be interested in.
750 */
751 static int iowarrior_probe(struct usb_interface *interface,
752 const struct usb_device_id *id)
753 {
754 struct usb_device *udev = interface_to_usbdev(interface);
755 struct iowarrior *dev = NULL;
756 struct usb_host_interface *iface_desc;
757 int retval = -ENOMEM;
758 int res;
759
760 /* allocate memory for our device state and initialize it */
761 dev = kzalloc(sizeof(struct iowarrior), GFP_KERNEL);
762 if (!dev)
763 return retval;
764
765 mutex_init(&dev->mutex);
766
767 atomic_set(&dev->intr_idx, 0);
768 atomic_set(&dev->read_idx, 0);
769 atomic_set(&dev->overflow_flag, 0);
770 init_waitqueue_head(&dev->read_wait);
771 atomic_set(&dev->write_busy, 0);
772 init_waitqueue_head(&dev->write_wait);
773
774 dev->udev = udev;
775 dev->interface = usb_get_intf(interface);
776
777 iface_desc = interface->cur_altsetting;
778 dev->product_id = le16_to_cpu(udev->descriptor.idProduct);
779
780 init_usb_anchor(&dev->submitted);
781
782 res = usb_find_last_int_in_endpoint(iface_desc, &dev->int_in_endpoint);
783 if (res) {
784 dev_err(&interface->dev, "no interrupt-in endpoint found\n");
785 retval = res;
786 goto error;
787 }
788
789 if ((dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW56) ||
790 (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW56AM) ||
791 (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW28) ||
792 (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW28L) ||
793 (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW100)) {
794 res = usb_find_last_int_out_endpoint(iface_desc,
795 &dev->int_out_endpoint);
796 if (res) {
797 dev_err(&interface->dev, "no interrupt-out endpoint found\n");
798 retval = res;
799 goto error;
800 }
801 }
802
803 /* we have to check the report_size often, so remember it in the endianness suitable for our machine */
804 dev->report_size = usb_endpoint_maxp(dev->int_in_endpoint);
805 if ((dev->interface->cur_altsetting->desc.bInterfaceNumber == 0) &&
806 ((dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW56) ||
807 (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW56AM) ||
808 (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW28) ||
809 (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW28L) ||
810 (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW100)))
811 /* IOWarrior56 has wMaxPacketSize different from report size */
812 dev->report_size = 7;
813
814 /* create the urb and buffer for reading */
815 dev->int_in_urb = usb_alloc_urb(0, GFP_KERNEL);
816 if (!dev->int_in_urb)
817 goto error;
818 dev->int_in_buffer = kmalloc(dev->report_size, GFP_KERNEL);
819 if (!dev->int_in_buffer)
820 goto error;
821 usb_fill_int_urb(dev->int_in_urb, dev->udev,
822 usb_rcvintpipe(dev->udev,
823 dev->int_in_endpoint->bEndpointAddress),
824 dev->int_in_buffer, dev->report_size,
825 iowarrior_callback, dev,
826 dev->int_in_endpoint->bInterval);
827 /* create an internal buffer for interrupt data from the device */
828 dev->read_queue =
829 kmalloc_array(dev->report_size + 1, MAX_INTERRUPT_BUFFER,
830 GFP_KERNEL);
831 if (!dev->read_queue)
832 goto error;
833 /* Get the serial-number of the chip */
834 memset(dev->chip_serial, 0x00, sizeof(dev->chip_serial));
835 usb_string(udev, udev->descriptor.iSerialNumber, dev->chip_serial,
836 sizeof(dev->chip_serial));
837 if (strlen(dev->chip_serial) != 8)
838 memset(dev->chip_serial, 0x00, sizeof(dev->chip_serial));
839
840 /* Set the idle timeout to 0, if this is interface 0 */
841 if (dev->interface->cur_altsetting->desc.bInterfaceNumber == 0) {
842 usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
843 0x0A,
844 USB_TYPE_CLASS | USB_RECIP_INTERFACE, 0,
845 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
846 }
847 /* allow device read and ioctl */
848 dev->present = 1;
849
850 /* we can register the device now, as it is ready */
851 usb_set_intfdata(interface, dev);
852
853 retval = usb_register_dev(interface, &iowarrior_class);
854 if (retval) {
855 /* something prevented us from registering this driver */
856 dev_err(&interface->dev, "Not able to get a minor for this device.\n");
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 = usb_get_intfdata(interface);
881 int minor = dev->minor;
882
883 usb_deregister_dev(interface, &iowarrior_class);
884
885 mutex_lock(&dev->mutex);
886
887 /* prevent device read, write and ioctl */
888 dev->present = 0;
889
890 if (dev->opened) {
891 /* There is a process that holds a filedescriptor to the device ,
892 so we only shutdown read-/write-ops going on.
893 Deleting the device is postponed until close() was called.
894 */
895 usb_kill_urb(dev->int_in_urb);
896 usb_kill_anchored_urbs(&dev->submitted);
897 wake_up_interruptible(&dev->read_wait);
898 wake_up_interruptible(&dev->write_wait);
899 mutex_unlock(&dev->mutex);
900 } else {
901 /* no process is using the device, cleanup now */
902 mutex_unlock(&dev->mutex);
903 iowarrior_delete(dev);
904 }
905
906 dev_info(&interface->dev, "I/O-Warror #%d now disconnected\n",
907 minor - IOWARRIOR_MINOR_BASE);
908 }
909
910 /* usb specific object needed to register this driver with the usb subsystem */
911 static struct usb_driver iowarrior_driver = {
912 .name = "iowarrior",
913 .probe = iowarrior_probe,
914 .disconnect = iowarrior_disconnect,
915 .id_table = iowarrior_ids,
916 };
917
918 module_usb_driver(iowarrior_driver);
Linux with added FPC-III support