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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
37/* Get a minor range for your devices from the usb maintainer */
38#ifdef CONFIG_USB_DYNAMIC_MINORS
39#define IOWARRIOR_MINOR_BASE 0
40#else
41#define IOWARRIOR_MINOR_BASE 208 // SKELETON_MINOR_BASE 192 + 16, not official yet
42#endif
43
44/* interrupt input queue size */
45#define MAX_INTERRUPT_BUFFER 16
46/*
47 maximum number of urbs that are submitted for writes at the same time,
48 this applies to the IOWarrior56 only!
49 IOWarrior24 and IOWarrior40 use synchronous usb_control_msg calls.
50*/
51#define MAX_WRITES_IN_FLIGHT 4
52
53MODULE_AUTHOR(DRIVER_AUTHOR);
54MODULE_DESCRIPTION(DRIVER_DESC);
55MODULE_LICENSE("GPL");
56
57static struct usb_driver iowarrior_driver;
58
59/*--------------*/
60/* data */
61/*--------------*/
62
63/* Structure to hold all of our device specific stuff */
64struct iowarrior {
65 struct mutex mutex; /* locks this structure */
66 struct usb_device *udev; /* save off the usb device pointer */
67 struct usb_interface *interface; /* the interface for this device */
68 unsigned char minor; /* the starting minor number for this device */
69 struct usb_endpoint_descriptor *int_out_endpoint; /* endpoint for reading (needed for IOW56 only) */
70 struct usb_endpoint_descriptor *int_in_endpoint; /* endpoint for reading */
71 struct urb *int_in_urb; /* the urb for reading data */
72 unsigned char *int_in_buffer; /* buffer for data to be read */
73 unsigned char serial_number; /* to detect lost packages */
74 unsigned char *read_queue; /* size is MAX_INTERRUPT_BUFFER * packet size */
75 wait_queue_head_t read_wait;
76 wait_queue_head_t write_wait; /* wait-queue for writing to the device */
77 atomic_t write_busy; /* number of write-urbs submitted */
78 atomic_t read_idx;
79 atomic_t intr_idx;
80 atomic_t overflow_flag; /* signals an index 'rollover' */
81 int present; /* this is 1 as long as the device is connected */
82 int opened; /* this is 1 if the device is currently open */
83 char chip_serial[9]; /* the serial number string of the chip connected */
84 int report_size; /* number of bytes in a report */
85 u16 product_id;
86 struct usb_anchor submitted;
87};
88
89/*--------------*/
90/* globals */
91/*--------------*/
92
93/*
94 * USB spec identifies 5 second timeouts.
95 */
96#define GET_TIMEOUT 5
97#define USB_REQ_GET_REPORT 0x01
98//#if 0
99static int usb_get_report(struct usb_device *dev,
100 struct usb_host_interface *inter, unsigned char type,
101 unsigned char id, void *buf, int size)
102{
103 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
104 USB_REQ_GET_REPORT,
105 USB_DIR_IN | USB_TYPE_CLASS |
106 USB_RECIP_INTERFACE, (type << 8) + id,
107 inter->desc.bInterfaceNumber, buf, size,
108 GET_TIMEOUT*HZ);
109}
110//#endif
111
112#define USB_REQ_SET_REPORT 0x09
113
114static int usb_set_report(struct usb_interface *intf, unsigned char type,
115 unsigned char id, void *buf, int size)
116{
117 return usb_control_msg(interface_to_usbdev(intf),
118 usb_sndctrlpipe(interface_to_usbdev(intf), 0),
119 USB_REQ_SET_REPORT,
120 USB_TYPE_CLASS | USB_RECIP_INTERFACE,
121 (type << 8) + id,
122 intf->cur_altsetting->desc.bInterfaceNumber, buf,
123 size, HZ);
124}
125
126/*---------------------*/
127/* driver registration */
128/*---------------------*/
129/* table of devices that work with this driver */
130static const struct usb_device_id iowarrior_ids[] = {
131 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW40)},
132 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW24)},
133 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOWPV1)},
134 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOWPV2)},
135 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW56)},
136 {} /* Terminating entry */
137};
138MODULE_DEVICE_TABLE(usb, iowarrior_ids);
139
140/*
141 * USB callback handler for reading data
142 */
143static void iowarrior_callback(struct urb *urb)
144{
145 struct iowarrior *dev = urb->context;
146 int intr_idx;
147 int read_idx;
148 int aux_idx;
149 int offset;
150 int status = urb->status;
151 int retval;
152
153 switch (status) {
154 case 0:
155 /* success */
156 break;
157 case -ECONNRESET:
158 case -ENOENT:
159 case -ESHUTDOWN:
160 return;
161 default:
162 goto exit;
163 }
164
165 intr_idx = atomic_read(&dev->intr_idx);
166 /* aux_idx become previous intr_idx */
167 aux_idx = (intr_idx == 0) ? (MAX_INTERRUPT_BUFFER - 1) : (intr_idx - 1);
168 read_idx = atomic_read(&dev->read_idx);
169
170 /* queue is not empty and it's interface 0 */
171 if ((intr_idx != read_idx)
172 && (dev->interface->cur_altsetting->desc.bInterfaceNumber == 0)) {
173 /* + 1 for serial number */
174 offset = aux_idx * (dev->report_size + 1);
175 if (!memcmp
176 (dev->read_queue + offset, urb->transfer_buffer,
177 dev->report_size)) {
178 /* equal values on interface 0 will be ignored */
179 goto exit;
180 }
181 }
182
183 /* aux_idx become next intr_idx */
184 aux_idx = (intr_idx == (MAX_INTERRUPT_BUFFER - 1)) ? 0 : (intr_idx + 1);
185 if (read_idx == aux_idx) {
186 /* queue full, dropping oldest input */
187 read_idx = (++read_idx == MAX_INTERRUPT_BUFFER) ? 0 : read_idx;
188 atomic_set(&dev->read_idx, read_idx);
189 atomic_set(&dev->overflow_flag, 1);
190 }
191
192 /* +1 for serial number */
193 offset = intr_idx * (dev->report_size + 1);
194 memcpy(dev->read_queue + offset, urb->transfer_buffer,
195 dev->report_size);
196 *(dev->read_queue + offset + (dev->report_size)) = dev->serial_number++;
197
198 atomic_set(&dev->intr_idx, aux_idx);
199 /* tell the blocking read about the new data */
200 wake_up_interruptible(&dev->read_wait);
201
202exit:
203 retval = usb_submit_urb(urb, GFP_ATOMIC);
204 if (retval)
205 dev_err(&dev->interface->dev, "%s - usb_submit_urb failed with result %d\n",
206 __func__, retval);
207
208}
209
210/*
211 * USB Callback handler for write-ops
212 */
213static void iowarrior_write_callback(struct urb *urb)
214{
215 struct iowarrior *dev;
216 int status = urb->status;
217
218 dev = urb->context;
219 /* sync/async unlink faults aren't errors */
220 if (status &&
221 !(status == -ENOENT ||
222 status == -ECONNRESET || status == -ESHUTDOWN)) {
223 dev_dbg(&dev->interface->dev,
224 "nonzero write bulk status received: %d\n", status);
225 }
226 /* free up our allocated buffer */
227 usb_free_coherent(urb->dev, urb->transfer_buffer_length,
228 urb->transfer_buffer, urb->transfer_dma);
229 /* tell a waiting writer the interrupt-out-pipe is available again */
230 atomic_dec(&dev->write_busy);
231 wake_up_interruptible(&dev->write_wait);
232}
233
234/**
235 * iowarrior_delete
236 */
237static inline void iowarrior_delete(struct iowarrior *dev)
238{
239 dev_dbg(&dev->interface->dev, "minor %d\n", dev->minor);
240 kfree(dev->int_in_buffer);
241 usb_free_urb(dev->int_in_urb);
242 kfree(dev->read_queue);
243 usb_put_intf(dev->interface);
244 kfree(dev);
245}
246
247/*---------------------*/
248/* fops implementation */
249/*---------------------*/
250
251static int read_index(struct iowarrior *dev)
252{
253 int intr_idx, read_idx;
254
255 read_idx = atomic_read(&dev->read_idx);
256 intr_idx = atomic_read(&dev->intr_idx);
257
258 return (read_idx == intr_idx ? -1 : read_idx);
259}
260
261/**
262 * iowarrior_read
263 */
264static ssize_t iowarrior_read(struct file *file, char __user *buffer,
265 size_t count, loff_t *ppos)
266{
267 struct iowarrior *dev;
268 int read_idx;
269 int offset;
270
271 dev = file->private_data;
272
273 /* verify that the device wasn't unplugged */
274 if (!dev || !dev->present)
275 return -ENODEV;
276
277 dev_dbg(&dev->interface->dev, "minor %d, count = %zd\n",
278 dev->minor, count);
279
280 /* read count must be packet size (+ time stamp) */
281 if ((count != dev->report_size)
282 && (count != (dev->report_size + 1)))
283 return -EINVAL;
284
285 /* repeat until no buffer overrun in callback handler occur */
286 do {
287 atomic_set(&dev->overflow_flag, 0);
288 if ((read_idx = read_index(dev)) == -1) {
289 /* queue empty */
290 if (file->f_flags & O_NONBLOCK)
291 return -EAGAIN;
292 else {
293 //next line will return when there is either new data, or the device is unplugged
294 int r = wait_event_interruptible(dev->read_wait,
295 (!dev->present
296 || (read_idx =
297 read_index
298 (dev)) !=
299 -1));
300 if (r) {
301 //we were interrupted by a signal
302 return -ERESTART;
303 }
304 if (!dev->present) {
305 //The device was unplugged
306 return -ENODEV;
307 }
308 if (read_idx == -1) {
309 // Can this happen ???
310 return 0;
311 }
312 }
313 }
314
315 offset = read_idx * (dev->report_size + 1);
316 if (copy_to_user(buffer, dev->read_queue + offset, count)) {
317 return -EFAULT;
318 }
319 } while (atomic_read(&dev->overflow_flag));
320
321 read_idx = ++read_idx == MAX_INTERRUPT_BUFFER ? 0 : read_idx;
322 atomic_set(&dev->read_idx, read_idx);
323 return count;
324}
325
326/*
327 * iowarrior_write
328 */
329static ssize_t iowarrior_write(struct file *file,
330 const char __user *user_buffer,
331 size_t count, loff_t *ppos)
332{
333 struct iowarrior *dev;
334 int retval = 0;
335 char *buf = NULL; /* for IOW24 and IOW56 we need a buffer */
336 struct urb *int_out_urb = NULL;
337
338 dev = file->private_data;
339
340 mutex_lock(&dev->mutex);
341 /* verify that the device wasn't unplugged */
342 if (!dev->present) {
343 retval = -ENODEV;
344 goto exit;
345 }
346 dev_dbg(&dev->interface->dev, "minor %d, count = %zd\n",
347 dev->minor, count);
348 /* if count is 0 we're already done */
349 if (count == 0) {
350 retval = 0;
351 goto exit;
352 }
353 /* We only accept full reports */
354 if (count != dev->report_size) {
355 retval = -EINVAL;
356 goto exit;
357 }
358 switch (dev->product_id) {
359 case USB_DEVICE_ID_CODEMERCS_IOW24:
360 case USB_DEVICE_ID_CODEMERCS_IOWPV1:
361 case USB_DEVICE_ID_CODEMERCS_IOWPV2:
362 case USB_DEVICE_ID_CODEMERCS_IOW40:
363 /* IOW24 and IOW40 use a synchronous call */
364 buf = memdup_user(user_buffer, count);
365 if (IS_ERR(buf)) {
366 retval = PTR_ERR(buf);
367 goto exit;
368 }
369 retval = usb_set_report(dev->interface, 2, 0, buf, count);
370 kfree(buf);
371 goto exit;
372 break;
373 case USB_DEVICE_ID_CODEMERCS_IOW56:
374 /* The IOW56 uses asynchronous IO and more urbs */
375 if (atomic_read(&dev->write_busy) == MAX_WRITES_IN_FLIGHT) {
376 /* Wait until we are below the limit for submitted urbs */
377 if (file->f_flags & O_NONBLOCK) {
378 retval = -EAGAIN;
379 goto exit;
380 } else {
381 retval = wait_event_interruptible(dev->write_wait,
382 (!dev->present || (atomic_read (&dev-> write_busy) < MAX_WRITES_IN_FLIGHT)));
383 if (retval) {
384 /* we were interrupted by a signal */
385 retval = -ERESTART;
386 goto exit;
387 }
388 if (!dev->present) {
389 /* The device was unplugged */
390 retval = -ENODEV;
391 goto exit;
392 }
393 if (!dev->opened) {
394 /* We were closed while waiting for an URB */
395 retval = -ENODEV;
396 goto exit;
397 }
398 }
399 }
400 atomic_inc(&dev->write_busy);
401 int_out_urb = usb_alloc_urb(0, GFP_KERNEL);
402 if (!int_out_urb) {
403 retval = -ENOMEM;
404 goto error_no_urb;
405 }
406 buf = usb_alloc_coherent(dev->udev, dev->report_size,
407 GFP_KERNEL, &int_out_urb->transfer_dma);
408 if (!buf) {
409 retval = -ENOMEM;
410 dev_dbg(&dev->interface->dev,
411 "Unable to allocate buffer\n");
412 goto error_no_buffer;
413 }
414 usb_fill_int_urb(int_out_urb, dev->udev,
415 usb_sndintpipe(dev->udev,
416 dev->int_out_endpoint->bEndpointAddress),
417 buf, dev->report_size,
418 iowarrior_write_callback, dev,
419 dev->int_out_endpoint->bInterval);
420 int_out_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
421 if (copy_from_user(buf, user_buffer, count)) {
422 retval = -EFAULT;
423 goto error;
424 }
425 usb_anchor_urb(int_out_urb, &dev->submitted);
426 retval = usb_submit_urb(int_out_urb, GFP_KERNEL);
427 if (retval) {
428 dev_dbg(&dev->interface->dev,
429 "submit error %d for urb nr.%d\n",
430 retval, atomic_read(&dev->write_busy));
431 usb_unanchor_urb(int_out_urb);
432 goto error;
433 }
434 /* submit was ok */
435 retval = count;
436 usb_free_urb(int_out_urb);
437 goto exit;
438 break;
439 default:
440 /* what do we have here ? An unsupported Product-ID ? */
441 dev_err(&dev->interface->dev, "%s - not supported for product=0x%x\n",
442 __func__, dev->product_id);
443 retval = -EFAULT;
444 goto exit;
445 break;
446 }
447error:
448 usb_free_coherent(dev->udev, dev->report_size, buf,
449 int_out_urb->transfer_dma);
450error_no_buffer:
451 usb_free_urb(int_out_urb);
452error_no_urb:
453 atomic_dec(&dev->write_busy);
454 wake_up_interruptible(&dev->write_wait);
455exit:
456 mutex_unlock(&dev->mutex);
457 return retval;
458}
459
460/**
461 * iowarrior_ioctl
462 */
463static long iowarrior_ioctl(struct file *file, unsigned int cmd,
464 unsigned long arg)
465{
466 struct iowarrior *dev = NULL;
467 __u8 *buffer;
468 __u8 __user *user_buffer;
469 int retval;
470 int io_res; /* checks for bytes read/written and copy_to/from_user results */
471
472 dev = file->private_data;
473 if (!dev)
474 return -ENODEV;
475
476 buffer = kzalloc(dev->report_size, GFP_KERNEL);
477 if (!buffer)
478 return -ENOMEM;
479
480 mutex_lock(&dev->mutex);
481
482 /* verify that the device wasn't unplugged */
483 if (!dev->present) {
484 retval = -ENODEV;
485 goto error_out;
486 }
487
488 dev_dbg(&dev->interface->dev, "minor %d, cmd 0x%.4x, arg %ld\n",
489 dev->minor, cmd, arg);
490
491 retval = 0;
492 io_res = 0;
493 switch (cmd) {
494 case IOW_WRITE:
495 if (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW24 ||
496 dev->product_id == USB_DEVICE_ID_CODEMERCS_IOWPV1 ||
497 dev->product_id == USB_DEVICE_ID_CODEMERCS_IOWPV2 ||
498 dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW40) {
499 user_buffer = (__u8 __user *)arg;
500 io_res = copy_from_user(buffer, user_buffer,
501 dev->report_size);
502 if (io_res) {
503 retval = -EFAULT;
504 } else {
505 io_res = usb_set_report(dev->interface, 2, 0,
506 buffer,
507 dev->report_size);
508 if (io_res < 0)
509 retval = io_res;
510 }
511 } else {
512 retval = -EINVAL;
513 dev_err(&dev->interface->dev,
514 "ioctl 'IOW_WRITE' is not supported for product=0x%x.\n",
515 dev->product_id);
516 }
517 break;
518 case IOW_READ:
519 user_buffer = (__u8 __user *)arg;
520 io_res = usb_get_report(dev->udev,
521 dev->interface->cur_altsetting, 1, 0,
522 buffer, dev->report_size);
523 if (io_res < 0)
524 retval = io_res;
525 else {
526 io_res = copy_to_user(user_buffer, buffer, dev->report_size);
527 if (io_res)
528 retval = -EFAULT;
529 }
530 break;
531 case IOW_GETINFO:
532 {
533 /* Report available information for the device */
534 struct iowarrior_info info;
535 /* needed for power consumption */
536 struct usb_config_descriptor *cfg_descriptor = &dev->udev->actconfig->desc;
537
538 memset(&info, 0, sizeof(info));
539 /* directly from the descriptor */
540 info.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
541 info.product = dev->product_id;
542 info.revision = le16_to_cpu(dev->udev->descriptor.bcdDevice);
543
544 /* 0==UNKNOWN, 1==LOW(usb1.1) ,2=FULL(usb1.1), 3=HIGH(usb2.0) */
545 info.speed = dev->udev->speed;
546 info.if_num = dev->interface->cur_altsetting->desc.bInterfaceNumber;
547 info.report_size = dev->report_size;
548
549 /* serial number string has been read earlier 8 chars or empty string */
550 memcpy(info.serial, dev->chip_serial,
551 sizeof(dev->chip_serial));
552 if (cfg_descriptor == NULL) {
553 info.power = -1; /* no information available */
554 } else {
555 /* the MaxPower is stored in units of 2mA to make it fit into a byte-value */
556 info.power = cfg_descriptor->bMaxPower * 2;
557 }
558 io_res = copy_to_user((struct iowarrior_info __user *)arg, &info,
559 sizeof(struct iowarrior_info));
560 if (io_res)
561 retval = -EFAULT;
562 break;
563 }
564 default:
565 /* return that we did not understand this ioctl call */
566 retval = -ENOTTY;
567 break;
568 }
569error_out:
570 /* unlock the device */
571 mutex_unlock(&dev->mutex);
572 kfree(buffer);
573 return retval;
574}
575
576/**
577 * iowarrior_open
578 */
579static int iowarrior_open(struct inode *inode, struct file *file)
580{
581 struct iowarrior *dev = NULL;
582 struct usb_interface *interface;
583 int subminor;
584 int retval = 0;
585
586 subminor = iminor(inode);
587
588 interface = usb_find_interface(&iowarrior_driver, subminor);
589 if (!interface) {
590 pr_err("%s - error, can't find device for minor %d\n",
591 __func__, subminor);
592 return -ENODEV;
593 }
594
595 dev = usb_get_intfdata(interface);
596 if (!dev)
597 return -ENODEV;
598
599 mutex_lock(&dev->mutex);
600
601 /* Only one process can open each device, no sharing. */
602 if (dev->opened) {
603 retval = -EBUSY;
604 goto out;
605 }
606
607 /* setup interrupt handler for receiving values */
608 if ((retval = usb_submit_urb(dev->int_in_urb, GFP_KERNEL)) < 0) {
609 dev_err(&interface->dev, "Error %d while submitting URB\n", retval);
610 retval = -EFAULT;
611 goto out;
612 }
613 /* increment our usage count for the driver */
614 ++dev->opened;
615 /* save our object in the file's private structure */
616 file->private_data = dev;
617 retval = 0;
618
619out:
620 mutex_unlock(&dev->mutex);
621 return retval;
622}
623
624/**
625 * iowarrior_release
626 */
627static int iowarrior_release(struct inode *inode, struct file *file)
628{
629 struct iowarrior *dev;
630 int retval = 0;
631
632 dev = file->private_data;
633 if (!dev)
634 return -ENODEV;
635
636 dev_dbg(&dev->interface->dev, "minor %d\n", dev->minor);
637
638 /* lock our device */
639 mutex_lock(&dev->mutex);
640
641 if (dev->opened <= 0) {
642 retval = -ENODEV; /* close called more than once */
643 mutex_unlock(&dev->mutex);
644 } else {
645 dev->opened = 0; /* we're closing now */
646 retval = 0;
647 if (dev->present) {
648 /*
649 The device is still connected so we only shutdown
650 pending read-/write-ops.
651 */
652 usb_kill_urb(dev->int_in_urb);
653 wake_up_interruptible(&dev->read_wait);
654 wake_up_interruptible(&dev->write_wait);
655 mutex_unlock(&dev->mutex);
656 } else {
657 /* The device was unplugged, cleanup resources */
658 mutex_unlock(&dev->mutex);
659 iowarrior_delete(dev);
660 }
661 }
662 return retval;
663}
664
665static __poll_t iowarrior_poll(struct file *file, poll_table * wait)
666{
667 struct iowarrior *dev = file->private_data;
668 __poll_t mask = 0;
669
670 if (!dev->present)
671 return EPOLLERR | EPOLLHUP;
672
673 poll_wait(file, &dev->read_wait, wait);
674 poll_wait(file, &dev->write_wait, wait);
675
676 if (!dev->present)
677 return EPOLLERR | EPOLLHUP;
678
679 if (read_index(dev) != -1)
680 mask |= EPOLLIN | EPOLLRDNORM;
681
682 if (atomic_read(&dev->write_busy) < MAX_WRITES_IN_FLIGHT)
683 mask |= EPOLLOUT | EPOLLWRNORM;
684 return mask;
685}
686
687/*
688 * File operations needed when we register this driver.
689 * This assumes that this driver NEEDS file operations,
690 * of course, which means that the driver is expected
691 * to have a node in the /dev directory. If the USB
692 * device were for a network interface then the driver
693 * would use "struct net_driver" instead, and a serial
694 * device would use "struct tty_driver".
695 */
696static const struct file_operations iowarrior_fops = {
697 .owner = THIS_MODULE,
698 .write = iowarrior_write,
699 .read = iowarrior_read,
700 .unlocked_ioctl = iowarrior_ioctl,
701 .open = iowarrior_open,
702 .release = iowarrior_release,
703 .poll = iowarrior_poll,
704 .llseek = noop_llseek,
705};
706
707static char *iowarrior_devnode(struct device *dev, umode_t *mode)
708{
709 return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev));
710}
711
712/*
713 * usb class driver info in order to get a minor number from the usb core,
714 * and to have the device registered with devfs and the driver core
715 */
716static struct usb_class_driver iowarrior_class = {
717 .name = "iowarrior%d",
718 .devnode = iowarrior_devnode,
719 .fops = &iowarrior_fops,
720 .minor_base = IOWARRIOR_MINOR_BASE,
721};
722
723/*---------------------------------*/
724/* probe and disconnect functions */
725/*---------------------------------*/
726/**
727 * iowarrior_probe
728 *
729 * Called by the usb core when a new device is connected that it thinks
730 * this driver might be interested in.
731 */
732static int iowarrior_probe(struct usb_interface *interface,
733 const struct usb_device_id *id)
734{
735 struct usb_device *udev = interface_to_usbdev(interface);
736 struct iowarrior *dev = NULL;
737 struct usb_host_interface *iface_desc;
738 int retval = -ENOMEM;
739 int res;
740
741 /* allocate memory for our device state and initialize it */
742 dev = kzalloc(sizeof(struct iowarrior), GFP_KERNEL);
743 if (!dev)
744 return retval;
745
746 mutex_init(&dev->mutex);
747
748 atomic_set(&dev->intr_idx, 0);
749 atomic_set(&dev->read_idx, 0);
750 atomic_set(&dev->overflow_flag, 0);
751 init_waitqueue_head(&dev->read_wait);
752 atomic_set(&dev->write_busy, 0);
753 init_waitqueue_head(&dev->write_wait);
754
755 dev->udev = udev;
756 dev->interface = usb_get_intf(interface);
757
758 iface_desc = interface->cur_altsetting;
759 dev->product_id = le16_to_cpu(udev->descriptor.idProduct);
760
761 init_usb_anchor(&dev->submitted);
762
763 res = usb_find_last_int_in_endpoint(iface_desc, &dev->int_in_endpoint);
764 if (res) {
765 dev_err(&interface->dev, "no interrupt-in endpoint found\n");
766 retval = res;
767 goto error;
768 }
769
770 if (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW56) {
771 res = usb_find_last_int_out_endpoint(iface_desc,
772 &dev->int_out_endpoint);
773 if (res) {
774 dev_err(&interface->dev, "no interrupt-out endpoint found\n");
775 retval = res;
776 goto error;
777 }
778 }
779
780 /* we have to check the report_size often, so remember it in the endianness suitable for our machine */
781 dev->report_size = usb_endpoint_maxp(dev->int_in_endpoint);
782 if ((dev->interface->cur_altsetting->desc.bInterfaceNumber == 0) &&
783 (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW56))
784 /* IOWarrior56 has wMaxPacketSize different from report size */
785 dev->report_size = 7;
786
787 /* create the urb and buffer for reading */
788 dev->int_in_urb = usb_alloc_urb(0, GFP_KERNEL);
789 if (!dev->int_in_urb)
790 goto error;
791 dev->int_in_buffer = kmalloc(dev->report_size, GFP_KERNEL);
792 if (!dev->int_in_buffer)
793 goto error;
794 usb_fill_int_urb(dev->int_in_urb, dev->udev,
795 usb_rcvintpipe(dev->udev,
796 dev->int_in_endpoint->bEndpointAddress),
797 dev->int_in_buffer, dev->report_size,
798 iowarrior_callback, dev,
799 dev->int_in_endpoint->bInterval);
800 /* create an internal buffer for interrupt data from the device */
801 dev->read_queue =
802 kmalloc_array(dev->report_size + 1, MAX_INTERRUPT_BUFFER,
803 GFP_KERNEL);
804 if (!dev->read_queue)
805 goto error;
806 /* Get the serial-number of the chip */
807 memset(dev->chip_serial, 0x00, sizeof(dev->chip_serial));
808 usb_string(udev, udev->descriptor.iSerialNumber, dev->chip_serial,
809 sizeof(dev->chip_serial));
810 if (strlen(dev->chip_serial) != 8)
811 memset(dev->chip_serial, 0x00, sizeof(dev->chip_serial));
812
813 /* Set the idle timeout to 0, if this is interface 0 */
814 if (dev->interface->cur_altsetting->desc.bInterfaceNumber == 0) {
815 usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
816 0x0A,
817 USB_TYPE_CLASS | USB_RECIP_INTERFACE, 0,
818 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
819 }
820 /* allow device read and ioctl */
821 dev->present = 1;
822
823 /* we can register the device now, as it is ready */
824 usb_set_intfdata(interface, dev);
825
826 retval = usb_register_dev(interface, &iowarrior_class);
827 if (retval) {
828 /* something prevented us from registering this driver */
829 dev_err(&interface->dev, "Not able to get a minor for this device.\n");
830 goto error;
831 }
832
833 dev->minor = interface->minor;
834
835 /* let the user know what node this device is now attached to */
836 dev_info(&interface->dev, "IOWarrior product=0x%x, serial=%s interface=%d "
837 "now attached to iowarrior%d\n", dev->product_id, dev->chip_serial,
838 iface_desc->desc.bInterfaceNumber, dev->minor - IOWARRIOR_MINOR_BASE);
839 return retval;
840
841error:
842 iowarrior_delete(dev);
843 return retval;
844}
845
846/**
847 * iowarrior_disconnect
848 *
849 * Called by the usb core when the device is removed from the system.
850 */
851static void iowarrior_disconnect(struct usb_interface *interface)
852{
853 struct iowarrior *dev = usb_get_intfdata(interface);
854 int minor = dev->minor;
855
856 usb_deregister_dev(interface, &iowarrior_class);
857
858 mutex_lock(&dev->mutex);
859
860 /* prevent device read, write and ioctl */
861 dev->present = 0;
862
863 if (dev->opened) {
864 /* There is a process that holds a filedescriptor to the device ,
865 so we only shutdown read-/write-ops going on.
866 Deleting the device is postponed until close() was called.
867 */
868 usb_kill_urb(dev->int_in_urb);
869 usb_kill_anchored_urbs(&dev->submitted);
870 wake_up_interruptible(&dev->read_wait);
871 wake_up_interruptible(&dev->write_wait);
872 mutex_unlock(&dev->mutex);
873 } else {
874 /* no process is using the device, cleanup now */
875 mutex_unlock(&dev->mutex);
876 iowarrior_delete(dev);
877 }
878
879 dev_info(&interface->dev, "I/O-Warror #%d now disconnected\n",
880 minor - IOWARRIOR_MINOR_BASE);
881}
882
883/* usb specific object needed to register this driver with the usb subsystem */
884static struct usb_driver iowarrior_driver = {
885 .name = "iowarrior",
886 .probe = iowarrior_probe,
887 .disconnect = iowarrior_disconnect,
888 .id_table = iowarrior_ids,
889};
890
891module_usb_driver(iowarrior_driver);
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/* Use our own dbg macro */
55#undef dbg
56#define dbg( format, arg... ) do { if( debug ) printk( KERN_DEBUG __FILE__ ": " format "\n" , ## arg ); } while ( 0 )
57
58MODULE_AUTHOR(DRIVER_AUTHOR);
59MODULE_DESCRIPTION(DRIVER_DESC);
60MODULE_LICENSE("GPL");
61
62/* Module parameters */
63static DEFINE_MUTEX(iowarrior_mutex);
64static bool debug = 0;
65module_param(debug, bool, 0644);
66MODULE_PARM_DESC(debug, "debug=1 enables debugging messages");
67
68static struct usb_driver iowarrior_driver;
69static DEFINE_MUTEX(iowarrior_open_disc_lock);
70
71/*--------------*/
72/* data */
73/*--------------*/
74
75/* Structure to hold all of our device specific stuff */
76struct iowarrior {
77 struct mutex mutex; /* locks this structure */
78 struct usb_device *udev; /* save off the usb device pointer */
79 struct usb_interface *interface; /* the interface for this device */
80 unsigned char minor; /* the starting minor number for this device */
81 struct usb_endpoint_descriptor *int_out_endpoint; /* endpoint for reading (needed for IOW56 only) */
82 struct usb_endpoint_descriptor *int_in_endpoint; /* endpoint for reading */
83 struct urb *int_in_urb; /* the urb for reading data */
84 unsigned char *int_in_buffer; /* buffer for data to be read */
85 unsigned char serial_number; /* to detect lost packages */
86 unsigned char *read_queue; /* size is MAX_INTERRUPT_BUFFER * packet size */
87 wait_queue_head_t read_wait;
88 wait_queue_head_t write_wait; /* wait-queue for writing to the device */
89 atomic_t write_busy; /* number of write-urbs submitted */
90 atomic_t read_idx;
91 atomic_t intr_idx;
92 spinlock_t intr_idx_lock; /* protects intr_idx */
93 atomic_t overflow_flag; /* signals an index 'rollover' */
94 int present; /* this is 1 as long as the device is connected */
95 int opened; /* this is 1 if the device is currently open */
96 char chip_serial[9]; /* the serial number string of the chip connected */
97 int report_size; /* number of bytes in a report */
98 u16 product_id;
99};
100
101/*--------------*/
102/* globals */
103/*--------------*/
104
105/*
106 * USB spec identifies 5 second timeouts.
107 */
108#define GET_TIMEOUT 5
109#define USB_REQ_GET_REPORT 0x01
110//#if 0
111static int usb_get_report(struct usb_device *dev,
112 struct usb_host_interface *inter, unsigned char type,
113 unsigned char id, void *buf, int size)
114{
115 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
116 USB_REQ_GET_REPORT,
117 USB_DIR_IN | USB_TYPE_CLASS |
118 USB_RECIP_INTERFACE, (type << 8) + id,
119 inter->desc.bInterfaceNumber, buf, size,
120 GET_TIMEOUT*HZ);
121}
122//#endif
123
124#define USB_REQ_SET_REPORT 0x09
125
126static int usb_set_report(struct usb_interface *intf, unsigned char type,
127 unsigned char id, void *buf, int size)
128{
129 return usb_control_msg(interface_to_usbdev(intf),
130 usb_sndctrlpipe(interface_to_usbdev(intf), 0),
131 USB_REQ_SET_REPORT,
132 USB_TYPE_CLASS | USB_RECIP_INTERFACE,
133 (type << 8) + id,
134 intf->cur_altsetting->desc.bInterfaceNumber, buf,
135 size, HZ);
136}
137
138/*---------------------*/
139/* driver registration */
140/*---------------------*/
141/* table of devices that work with this driver */
142static const struct usb_device_id iowarrior_ids[] = {
143 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW40)},
144 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW24)},
145 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOWPV1)},
146 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOWPV2)},
147 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW56)},
148 {} /* Terminating entry */
149};
150MODULE_DEVICE_TABLE(usb, iowarrior_ids);
151
152/*
153 * USB callback handler for reading data
154 */
155static void iowarrior_callback(struct urb *urb)
156{
157 struct iowarrior *dev = urb->context;
158 int intr_idx;
159 int read_idx;
160 int aux_idx;
161 int offset;
162 int status = urb->status;
163 int retval;
164
165 switch (status) {
166 case 0:
167 /* success */
168 break;
169 case -ECONNRESET:
170 case -ENOENT:
171 case -ESHUTDOWN:
172 return;
173 default:
174 goto exit;
175 }
176
177 spin_lock(&dev->intr_idx_lock);
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 spin_unlock(&dev->intr_idx_lock);
193 goto exit;
194 }
195 }
196
197 /* aux_idx become next intr_idx */
198 aux_idx = (intr_idx == (MAX_INTERRUPT_BUFFER - 1)) ? 0 : (intr_idx + 1);
199 if (read_idx == aux_idx) {
200 /* queue full, dropping oldest input */
201 read_idx = (++read_idx == MAX_INTERRUPT_BUFFER) ? 0 : read_idx;
202 atomic_set(&dev->read_idx, read_idx);
203 atomic_set(&dev->overflow_flag, 1);
204 }
205
206 /* +1 for serial number */
207 offset = intr_idx * (dev->report_size + 1);
208 memcpy(dev->read_queue + offset, urb->transfer_buffer,
209 dev->report_size);
210 *(dev->read_queue + offset + (dev->report_size)) = dev->serial_number++;
211
212 atomic_set(&dev->intr_idx, aux_idx);
213 spin_unlock(&dev->intr_idx_lock);
214 /* tell the blocking read about the new data */
215 wake_up_interruptible(&dev->read_wait);
216
217exit:
218 retval = usb_submit_urb(urb, GFP_ATOMIC);
219 if (retval)
220 dev_err(&dev->interface->dev, "%s - usb_submit_urb failed with result %d\n",
221 __func__, retval);
222
223}
224
225/*
226 * USB Callback handler for write-ops
227 */
228static void iowarrior_write_callback(struct urb *urb)
229{
230 struct iowarrior *dev;
231 int status = urb->status;
232
233 dev = urb->context;
234 /* sync/async unlink faults aren't errors */
235 if (status &&
236 !(status == -ENOENT ||
237 status == -ECONNRESET || status == -ESHUTDOWN)) {
238 dbg("%s - nonzero write bulk status received: %d",
239 __func__, status);
240 }
241 /* free up our allocated buffer */
242 usb_free_coherent(urb->dev, urb->transfer_buffer_length,
243 urb->transfer_buffer, urb->transfer_dma);
244 /* tell a waiting writer the interrupt-out-pipe is available again */
245 atomic_dec(&dev->write_busy);
246 wake_up_interruptible(&dev->write_wait);
247}
248
249/**
250 * iowarrior_delete
251 */
252static inline void iowarrior_delete(struct iowarrior *dev)
253{
254 dbg("%s - minor %d", __func__, dev->minor);
255 kfree(dev->int_in_buffer);
256 usb_free_urb(dev->int_in_urb);
257 kfree(dev->read_queue);
258 kfree(dev);
259}
260
261/*---------------------*/
262/* fops implementation */
263/*---------------------*/
264
265static int read_index(struct iowarrior *dev)
266{
267 int intr_idx, read_idx;
268
269 read_idx = atomic_read(&dev->read_idx);
270 intr_idx = atomic_read(&dev->intr_idx);
271
272 return (read_idx == intr_idx ? -1 : read_idx);
273}
274
275/**
276 * iowarrior_read
277 */
278static ssize_t iowarrior_read(struct file *file, char __user *buffer,
279 size_t count, loff_t *ppos)
280{
281 struct iowarrior *dev;
282 int read_idx;
283 int offset;
284
285 dev = file->private_data;
286
287 /* verify that the device wasn't unplugged */
288 if (dev == NULL || !dev->present)
289 return -ENODEV;
290
291 dbg("%s - minor %d, count = %zd", __func__, 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 */
342static 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 dbg("%s - minor %d, count = %zd", __func__, dev->minor, count);
360 /* if count is 0 we're already done */
361 if (count == 0) {
362 retval = 0;
363 goto exit;
364 }
365 /* We only accept full reports */
366 if (count != dev->report_size) {
367 retval = -EINVAL;
368 goto exit;
369 }
370 switch (dev->product_id) {
371 case USB_DEVICE_ID_CODEMERCS_IOW24:
372 case USB_DEVICE_ID_CODEMERCS_IOWPV1:
373 case USB_DEVICE_ID_CODEMERCS_IOWPV2:
374 case USB_DEVICE_ID_CODEMERCS_IOW40:
375 /* IOW24 and IOW40 use a synchronous call */
376 buf = kmalloc(count, GFP_KERNEL);
377 if (!buf) {
378 retval = -ENOMEM;
379 goto exit;
380 }
381 if (copy_from_user(buf, user_buffer, count)) {
382 retval = -EFAULT;
383 kfree(buf);
384 goto exit;
385 }
386 retval = usb_set_report(dev->interface, 2, 0, buf, count);
387 kfree(buf);
388 goto exit;
389 break;
390 case USB_DEVICE_ID_CODEMERCS_IOW56:
391 /* The IOW56 uses asynchronous IO and more urbs */
392 if (atomic_read(&dev->write_busy) == MAX_WRITES_IN_FLIGHT) {
393 /* Wait until we are below the limit for submitted urbs */
394 if (file->f_flags & O_NONBLOCK) {
395 retval = -EAGAIN;
396 goto exit;
397 } else {
398 retval = wait_event_interruptible(dev->write_wait,
399 (!dev->present || (atomic_read (&dev-> write_busy) < MAX_WRITES_IN_FLIGHT)));
400 if (retval) {
401 /* we were interrupted by a signal */
402 retval = -ERESTART;
403 goto exit;
404 }
405 if (!dev->present) {
406 /* The device was unplugged */
407 retval = -ENODEV;
408 goto exit;
409 }
410 if (!dev->opened) {
411 /* We were closed while waiting for an URB */
412 retval = -ENODEV;
413 goto exit;
414 }
415 }
416 }
417 atomic_inc(&dev->write_busy);
418 int_out_urb = usb_alloc_urb(0, GFP_KERNEL);
419 if (!int_out_urb) {
420 retval = -ENOMEM;
421 dbg("%s Unable to allocate urb ", __func__);
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 dbg("%s Unable to allocate buffer ", __func__);
429 goto error_no_buffer;
430 }
431 usb_fill_int_urb(int_out_urb, dev->udev,
432 usb_sndintpipe(dev->udev,
433 dev->int_out_endpoint->bEndpointAddress),
434 buf, dev->report_size,
435 iowarrior_write_callback, dev,
436 dev->int_out_endpoint->bInterval);
437 int_out_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
438 if (copy_from_user(buf, user_buffer, count)) {
439 retval = -EFAULT;
440 goto error;
441 }
442 retval = usb_submit_urb(int_out_urb, GFP_KERNEL);
443 if (retval) {
444 dbg("%s submit error %d for urb nr.%d", __func__,
445 retval, atomic_read(&dev->write_busy));
446 goto error;
447 }
448 /* submit was ok */
449 retval = count;
450 usb_free_urb(int_out_urb);
451 goto exit;
452 break;
453 default:
454 /* what do we have here ? An unsupported Product-ID ? */
455 dev_err(&dev->interface->dev, "%s - not supported for product=0x%x\n",
456 __func__, dev->product_id);
457 retval = -EFAULT;
458 goto exit;
459 break;
460 }
461error:
462 usb_free_coherent(dev->udev, dev->report_size, buf,
463 int_out_urb->transfer_dma);
464error_no_buffer:
465 usb_free_urb(int_out_urb);
466error_no_urb:
467 atomic_dec(&dev->write_busy);
468 wake_up_interruptible(&dev->write_wait);
469exit:
470 mutex_unlock(&dev->mutex);
471 return retval;
472}
473
474/**
475 * iowarrior_ioctl
476 */
477static long iowarrior_ioctl(struct file *file, unsigned int cmd,
478 unsigned long arg)
479{
480 struct iowarrior *dev = NULL;
481 __u8 *buffer;
482 __u8 __user *user_buffer;
483 int retval;
484 int io_res; /* checks for bytes read/written and copy_to/from_user results */
485
486 dev = file->private_data;
487 if (dev == NULL) {
488 return -ENODEV;
489 }
490
491 buffer = kzalloc(dev->report_size, GFP_KERNEL);
492 if (!buffer)
493 return -ENOMEM;
494
495 /* lock this object */
496 mutex_lock(&iowarrior_mutex);
497 mutex_lock(&dev->mutex);
498
499 /* verify that the device wasn't unplugged */
500 if (!dev->present) {
501 retval = -ENODEV;
502 goto error_out;
503 }
504
505 dbg("%s - minor %d, cmd 0x%.4x, arg %ld", __func__, dev->minor, cmd,
506 arg);
507
508 retval = 0;
509 io_res = 0;
510 switch (cmd) {
511 case IOW_WRITE:
512 if (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW24 ||
513 dev->product_id == USB_DEVICE_ID_CODEMERCS_IOWPV1 ||
514 dev->product_id == USB_DEVICE_ID_CODEMERCS_IOWPV2 ||
515 dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW40) {
516 user_buffer = (__u8 __user *)arg;
517 io_res = copy_from_user(buffer, user_buffer,
518 dev->report_size);
519 if (io_res) {
520 retval = -EFAULT;
521 } else {
522 io_res = usb_set_report(dev->interface, 2, 0,
523 buffer,
524 dev->report_size);
525 if (io_res < 0)
526 retval = io_res;
527 }
528 } else {
529 retval = -EINVAL;
530 dev_err(&dev->interface->dev,
531 "ioctl 'IOW_WRITE' is not supported for product=0x%x.\n",
532 dev->product_id);
533 }
534 break;
535 case IOW_READ:
536 user_buffer = (__u8 __user *)arg;
537 io_res = usb_get_report(dev->udev,
538 dev->interface->cur_altsetting, 1, 0,
539 buffer, dev->report_size);
540 if (io_res < 0)
541 retval = io_res;
542 else {
543 io_res = copy_to_user(user_buffer, buffer, dev->report_size);
544 if (io_res)
545 retval = -EFAULT;
546 }
547 break;
548 case IOW_GETINFO:
549 {
550 /* Report available information for the device */
551 struct iowarrior_info info;
552 /* needed for power consumption */
553 struct usb_config_descriptor *cfg_descriptor = &dev->udev->actconfig->desc;
554
555 memset(&info, 0, sizeof(info));
556 /* directly from the descriptor */
557 info.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
558 info.product = dev->product_id;
559 info.revision = le16_to_cpu(dev->udev->descriptor.bcdDevice);
560
561 /* 0==UNKNOWN, 1==LOW(usb1.1) ,2=FULL(usb1.1), 3=HIGH(usb2.0) */
562 info.speed = le16_to_cpu(dev->udev->speed);
563 info.if_num = dev->interface->cur_altsetting->desc.bInterfaceNumber;
564 info.report_size = dev->report_size;
565
566 /* serial number string has been read earlier 8 chars or empty string */
567 memcpy(info.serial, dev->chip_serial,
568 sizeof(dev->chip_serial));
569 if (cfg_descriptor == NULL) {
570 info.power = -1; /* no information available */
571 } else {
572 /* the MaxPower is stored in units of 2mA to make it fit into a byte-value */
573 info.power = cfg_descriptor->bMaxPower * 2;
574 }
575 io_res = copy_to_user((struct iowarrior_info __user *)arg, &info,
576 sizeof(struct iowarrior_info));
577 if (io_res)
578 retval = -EFAULT;
579 break;
580 }
581 default:
582 /* return that we did not understand this ioctl call */
583 retval = -ENOTTY;
584 break;
585 }
586error_out:
587 /* unlock the device */
588 mutex_unlock(&dev->mutex);
589 mutex_unlock(&iowarrior_mutex);
590 kfree(buffer);
591 return retval;
592}
593
594/**
595 * iowarrior_open
596 */
597static int iowarrior_open(struct inode *inode, struct file *file)
598{
599 struct iowarrior *dev = NULL;
600 struct usb_interface *interface;
601 int subminor;
602 int retval = 0;
603
604 dbg("%s", __func__);
605
606 mutex_lock(&iowarrior_mutex);
607 subminor = iminor(inode);
608
609 interface = usb_find_interface(&iowarrior_driver, subminor);
610 if (!interface) {
611 mutex_unlock(&iowarrior_mutex);
612 printk(KERN_ERR "%s - error, can't find device for minor %d\n",
613 __func__, subminor);
614 return -ENODEV;
615 }
616
617 mutex_lock(&iowarrior_open_disc_lock);
618 dev = usb_get_intfdata(interface);
619 if (!dev) {
620 mutex_unlock(&iowarrior_open_disc_lock);
621 mutex_unlock(&iowarrior_mutex);
622 return -ENODEV;
623 }
624
625 mutex_lock(&dev->mutex);
626 mutex_unlock(&iowarrior_open_disc_lock);
627
628 /* Only one process can open each device, no sharing. */
629 if (dev->opened) {
630 retval = -EBUSY;
631 goto out;
632 }
633
634 /* setup interrupt handler for receiving values */
635 if ((retval = usb_submit_urb(dev->int_in_urb, GFP_KERNEL)) < 0) {
636 dev_err(&interface->dev, "Error %d while submitting URB\n", retval);
637 retval = -EFAULT;
638 goto out;
639 }
640 /* increment our usage count for the driver */
641 ++dev->opened;
642 /* save our object in the file's private structure */
643 file->private_data = dev;
644 retval = 0;
645
646out:
647 mutex_unlock(&dev->mutex);
648 mutex_unlock(&iowarrior_mutex);
649 return retval;
650}
651
652/**
653 * iowarrior_release
654 */
655static int iowarrior_release(struct inode *inode, struct file *file)
656{
657 struct iowarrior *dev;
658 int retval = 0;
659
660 dev = file->private_data;
661 if (dev == NULL) {
662 return -ENODEV;
663 }
664
665 dbg("%s - minor %d", __func__, dev->minor);
666
667 /* lock our device */
668 mutex_lock(&dev->mutex);
669
670 if (dev->opened <= 0) {
671 retval = -ENODEV; /* close called more than once */
672 mutex_unlock(&dev->mutex);
673 } else {
674 dev->opened = 0; /* we're closing now */
675 retval = 0;
676 if (dev->present) {
677 /*
678 The device is still connected so we only shutdown
679 pending read-/write-ops.
680 */
681 usb_kill_urb(dev->int_in_urb);
682 wake_up_interruptible(&dev->read_wait);
683 wake_up_interruptible(&dev->write_wait);
684 mutex_unlock(&dev->mutex);
685 } else {
686 /* The device was unplugged, cleanup resources */
687 mutex_unlock(&dev->mutex);
688 iowarrior_delete(dev);
689 }
690 }
691 return retval;
692}
693
694static unsigned iowarrior_poll(struct file *file, poll_table * wait)
695{
696 struct iowarrior *dev = file->private_data;
697 unsigned int mask = 0;
698
699 if (!dev->present)
700 return POLLERR | POLLHUP;
701
702 poll_wait(file, &dev->read_wait, wait);
703 poll_wait(file, &dev->write_wait, wait);
704
705 if (!dev->present)
706 return POLLERR | POLLHUP;
707
708 if (read_index(dev) != -1)
709 mask |= POLLIN | POLLRDNORM;
710
711 if (atomic_read(&dev->write_busy) < MAX_WRITES_IN_FLIGHT)
712 mask |= POLLOUT | POLLWRNORM;
713 return mask;
714}
715
716/*
717 * File operations needed when we register this driver.
718 * This assumes that this driver NEEDS file operations,
719 * of course, which means that the driver is expected
720 * to have a node in the /dev directory. If the USB
721 * device were for a network interface then the driver
722 * would use "struct net_driver" instead, and a serial
723 * device would use "struct tty_driver".
724 */
725static const struct file_operations iowarrior_fops = {
726 .owner = THIS_MODULE,
727 .write = iowarrior_write,
728 .read = iowarrior_read,
729 .unlocked_ioctl = iowarrior_ioctl,
730 .open = iowarrior_open,
731 .release = iowarrior_release,
732 .poll = iowarrior_poll,
733 .llseek = noop_llseek,
734};
735
736static char *iowarrior_devnode(struct device *dev, umode_t *mode)
737{
738 return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev));
739}
740
741/*
742 * usb class driver info in order to get a minor number from the usb core,
743 * and to have the device registered with devfs and the driver core
744 */
745static struct usb_class_driver iowarrior_class = {
746 .name = "iowarrior%d",
747 .devnode = iowarrior_devnode,
748 .fops = &iowarrior_fops,
749 .minor_base = IOWARRIOR_MINOR_BASE,
750};
751
752/*---------------------------------*/
753/* probe and disconnect functions */
754/*---------------------------------*/
755/**
756 * iowarrior_probe
757 *
758 * Called by the usb core when a new device is connected that it thinks
759 * this driver might be interested in.
760 */
761static int iowarrior_probe(struct usb_interface *interface,
762 const struct usb_device_id *id)
763{
764 struct usb_device *udev = interface_to_usbdev(interface);
765 struct iowarrior *dev = NULL;
766 struct usb_host_interface *iface_desc;
767 struct usb_endpoint_descriptor *endpoint;
768 int i;
769 int retval = -ENOMEM;
770
771 /* allocate memory for our device state and initialize it */
772 dev = kzalloc(sizeof(struct iowarrior), GFP_KERNEL);
773 if (dev == NULL) {
774 dev_err(&interface->dev, "Out of memory\n");
775 return retval;
776 }
777
778 mutex_init(&dev->mutex);
779
780 atomic_set(&dev->intr_idx, 0);
781 atomic_set(&dev->read_idx, 0);
782 spin_lock_init(&dev->intr_idx_lock);
783 atomic_set(&dev->overflow_flag, 0);
784 init_waitqueue_head(&dev->read_wait);
785 atomic_set(&dev->write_busy, 0);
786 init_waitqueue_head(&dev->write_wait);
787
788 dev->udev = udev;
789 dev->interface = interface;
790
791 iface_desc = interface->cur_altsetting;
792 dev->product_id = le16_to_cpu(udev->descriptor.idProduct);
793
794 /* set up the endpoint information */
795 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
796 endpoint = &iface_desc->endpoint[i].desc;
797
798 if (usb_endpoint_is_int_in(endpoint))
799 dev->int_in_endpoint = endpoint;
800 if (usb_endpoint_is_int_out(endpoint))
801 /* this one will match for the IOWarrior56 only */
802 dev->int_out_endpoint = endpoint;
803 }
804 /* we have to check the report_size often, so remember it in the endianness suitable for our machine */
805 dev->report_size = usb_endpoint_maxp(dev->int_in_endpoint);
806 if ((dev->interface->cur_altsetting->desc.bInterfaceNumber == 0) &&
807 (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW56))
808 /* IOWarrior56 has wMaxPacketSize different from report size */
809 dev->report_size = 7;
810
811 /* create the urb and buffer for reading */
812 dev->int_in_urb = usb_alloc_urb(0, GFP_KERNEL);
813 if (!dev->int_in_urb) {
814 dev_err(&interface->dev, "Couldn't allocate interrupt_in_urb\n");
815 goto error;
816 }
817 dev->int_in_buffer = kmalloc(dev->report_size, GFP_KERNEL);
818 if (!dev->int_in_buffer) {
819 dev_err(&interface->dev, "Couldn't allocate int_in_buffer\n");
820 goto error;
821 }
822 usb_fill_int_urb(dev->int_in_urb, dev->udev,
823 usb_rcvintpipe(dev->udev,
824 dev->int_in_endpoint->bEndpointAddress),
825 dev->int_in_buffer, dev->report_size,
826 iowarrior_callback, dev,
827 dev->int_in_endpoint->bInterval);
828 /* create an internal buffer for interrupt data from the device */
829 dev->read_queue =
830 kmalloc(((dev->report_size + 1) * MAX_INTERRUPT_BUFFER),
831 GFP_KERNEL);
832 if (!dev->read_queue) {
833 dev_err(&interface->dev, "Couldn't allocate read_queue\n");
834 goto error;
835 }
836 /* Get the serial-number of the chip */
837 memset(dev->chip_serial, 0x00, sizeof(dev->chip_serial));
838 usb_string(udev, udev->descriptor.iSerialNumber, dev->chip_serial,
839 sizeof(dev->chip_serial));
840 if (strlen(dev->chip_serial) != 8)
841 memset(dev->chip_serial, 0x00, sizeof(dev->chip_serial));
842
843 /* Set the idle timeout to 0, if this is interface 0 */
844 if (dev->interface->cur_altsetting->desc.bInterfaceNumber == 0) {
845 usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
846 0x0A,
847 USB_TYPE_CLASS | USB_RECIP_INTERFACE, 0,
848 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
849 }
850 /* allow device read and ioctl */
851 dev->present = 1;
852
853 /* we can register the device now, as it is ready */
854 usb_set_intfdata(interface, dev);
855
856 retval = usb_register_dev(interface, &iowarrior_class);
857 if (retval) {
858 /* something prevented us from registering this driver */
859 dev_err(&interface->dev, "Not able to get a minor for this device.\n");
860 usb_set_intfdata(interface, NULL);
861 goto error;
862 }
863
864 dev->minor = interface->minor;
865
866 /* let the user know what node this device is now attached to */
867 dev_info(&interface->dev, "IOWarrior product=0x%x, serial=%s interface=%d "
868 "now attached to iowarrior%d\n", dev->product_id, dev->chip_serial,
869 iface_desc->desc.bInterfaceNumber, dev->minor - IOWARRIOR_MINOR_BASE);
870 return retval;
871
872error:
873 iowarrior_delete(dev);
874 return retval;
875}
876
877/**
878 * iowarrior_disconnect
879 *
880 * Called by the usb core when the device is removed from the system.
881 */
882static void iowarrior_disconnect(struct usb_interface *interface)
883{
884 struct iowarrior *dev;
885 int minor;
886
887 dev = usb_get_intfdata(interface);
888 mutex_lock(&iowarrior_open_disc_lock);
889 usb_set_intfdata(interface, NULL);
890
891 minor = dev->minor;
892
893 /* give back our minor */
894 usb_deregister_dev(interface, &iowarrior_class);
895
896 mutex_lock(&dev->mutex);
897
898 /* prevent device read, write and ioctl */
899 dev->present = 0;
900
901 mutex_unlock(&dev->mutex);
902 mutex_unlock(&iowarrior_open_disc_lock);
903
904 if (dev->opened) {
905 /* There is a process that holds a filedescriptor to the device ,
906 so we only shutdown read-/write-ops going on.
907 Deleting the device is postponed until close() was called.
908 */
909 usb_kill_urb(dev->int_in_urb);
910 wake_up_interruptible(&dev->read_wait);
911 wake_up_interruptible(&dev->write_wait);
912 } else {
913 /* no process is using the device, cleanup now */
914 iowarrior_delete(dev);
915 }
916
917 dev_info(&interface->dev, "I/O-Warror #%d now disconnected\n",
918 minor - IOWARRIOR_MINOR_BASE);
919}
920
921/* usb specific object needed to register this driver with the usb subsystem */
922static struct usb_driver iowarrior_driver = {
923 .name = "iowarrior",
924 .probe = iowarrior_probe,
925 .disconnect = iowarrior_disconnect,
926 .id_table = iowarrior_ids,
927};
928
929module_usb_driver(iowarrior_driver);