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authorGreg Kroah-Hartman <gregkh@suse.de>2007-02-14 16:40:14 -0500
committerGreg Kroah-Hartman <gregkh@suse.de>2007-02-23 18:03:45 -0500
commit946b960d13c15f050a3b848987aaca79f6a459b7 (patch)
tree7e2aafc311f399f74325730fb76191a4d5c0aa67 /drivers/usb/misc/iowarrior.c
parentfd978bfa127a0b8c0bdbbbc9d64f3c73bf080f61 (diff)
USB: add driver for iowarrior devices.
The ioctl is commented out for now, until we verify some userspace application issues. Cc: Christian Lucht <lucht@codemercs.com> Cc: Robert Marquardt <marquardt@codemercs.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/misc/iowarrior.c')
-rw-r--r--drivers/usb/misc/iowarrior.c925
1 files changed, 925 insertions, 0 deletions
diff --git a/drivers/usb/misc/iowarrior.c b/drivers/usb/misc/iowarrior.c
new file mode 100644
index 000000000000..d69665c8de02
--- /dev/null
+++ b/drivers/usb/misc/iowarrior.c
@@ -0,0 +1,925 @@
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/init.h>
19#include <linux/slab.h>
20#include <linux/sched.h>
21#include <linux/poll.h>
22#include <linux/version.h>
23#include <linux/usb/iowarrior.h>
24
25/* Version Information */
26#define DRIVER_VERSION "v0.4.0"
27#define DRIVER_AUTHOR "Christian Lucht <lucht@codemercs.com>"
28#define DRIVER_DESC "USB IO-Warrior driver (Linux 2.6.x)"
29
30#define USB_VENDOR_ID_CODEMERCS 1984
31/* low speed iowarrior */
32#define USB_DEVICE_ID_CODEMERCS_IOW40 0x1500
33#define USB_DEVICE_ID_CODEMERCS_IOW24 0x1501
34#define USB_DEVICE_ID_CODEMERCS_IOWPV1 0x1511
35#define USB_DEVICE_ID_CODEMERCS_IOWPV2 0x1512
36/* full speed iowarrior */
37#define USB_DEVICE_ID_CODEMERCS_IOW56 0x1503
38
39/* Get a minor range for your devices from the usb maintainer */
40#ifdef CONFIG_USB_DYNAMIC_MINORS
41#define IOWARRIOR_MINOR_BASE 0
42#else
43#define IOWARRIOR_MINOR_BASE 208 // SKELETON_MINOR_BASE 192 + 16, not offical yet
44#endif
45
46/* interrupt input queue size */
47#define MAX_INTERRUPT_BUFFER 16
48/*
49 maximum number of urbs that are submitted for writes at the same time,
50 this applies to the IOWarrior56 only!
51 IOWarrior24 and IOWarrior40 use synchronous usb_control_msg calls.
52*/
53#define MAX_WRITES_IN_FLIGHT 4
54
55/* Use our own dbg macro */
56#undef dbg
57#define dbg( format, arg... ) do { if( debug ) printk( KERN_DEBUG __FILE__ ": " format "\n" , ## arg ); } while ( 0 )
58
59MODULE_AUTHOR(DRIVER_AUTHOR);
60MODULE_DESCRIPTION(DRIVER_DESC);
61MODULE_LICENSE("GPL");
62
63/* Module parameters */
64static int debug = 0;
65module_param(debug, bool, 0644);
66MODULE_PARM_DESC(debug, "debug=1 enables debugging messages");
67
68static struct usb_driver iowarrior_driver;
69
70/*--------------*/
71/* data */
72/*--------------*/
73
74/* Structure to hold all of our device specific stuff */
75struct iowarrior {
76 struct mutex mutex; /* locks this structure */
77 struct usb_device *udev; /* save off the usb device pointer */
78 struct usb_interface *interface; /* the interface for this device */
79 unsigned char minor; /* the starting minor number for this device */
80 struct usb_endpoint_descriptor *int_out_endpoint; /* endpoint for reading (needed for IOW56 only) */
81 struct usb_endpoint_descriptor *int_in_endpoint; /* endpoint for reading */
82 struct urb *int_in_urb; /* the urb for reading data */
83 unsigned char *int_in_buffer; /* buffer for data to be read */
84 unsigned char serial_number; /* to detect lost packages */
85 unsigned char *read_queue; /* size is MAX_INTERRUPT_BUFFER * packet size */
86 wait_queue_head_t read_wait;
87 wait_queue_head_t write_wait; /* wait-queue for writing to the device */
88 atomic_t write_busy; /* number of write-urbs submitted */
89 atomic_t read_idx;
90 atomic_t intr_idx;
91 spinlock_t intr_idx_lock; /* protects intr_idx */
92 atomic_t overflow_flag; /* signals an index 'rollover' */
93 int present; /* this is 1 as long as the device is connected */
94 int opened; /* this is 1 if the device is currently open */
95 char chip_serial[9]; /* the serial number string of the chip connected */
96 int report_size; /* number of bytes in a report */
97 u16 product_id;
98};
99
100/*--------------*/
101/* globals */
102/*--------------*/
103/* prevent races between open() and disconnect() */
104static DECLARE_MUTEX(disconnect_sem);
105
106/*
107 * USB spec identifies 5 second timeouts.
108 */
109#define GET_TIMEOUT 5
110#define USB_REQ_GET_REPORT 0x01
111//#if 0
112static int usb_get_report(struct usb_device *dev,
113 struct usb_host_interface *inter, unsigned char type,
114 unsigned char id, void *buf, int size)
115{
116 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
117 USB_REQ_GET_REPORT,
118 USB_DIR_IN | USB_TYPE_CLASS |
119 USB_RECIP_INTERFACE, (type << 8) + id,
120 inter->desc.bInterfaceNumber, buf, size,
121 GET_TIMEOUT);
122}
123//#endif
124
125#define USB_REQ_SET_REPORT 0x09
126
127static int usb_set_report(struct usb_interface *intf, unsigned char type,
128 unsigned char id, void *buf, int size)
129{
130 return usb_control_msg(interface_to_usbdev(intf),
131 usb_sndctrlpipe(interface_to_usbdev(intf), 0),
132 USB_REQ_SET_REPORT,
133 USB_TYPE_CLASS | USB_RECIP_INTERFACE,
134 (type << 8) + id,
135 intf->cur_altsetting->desc.bInterfaceNumber, buf,
136 size, 1);
137}
138
139/*---------------------*/
140/* driver registration */
141/*---------------------*/
142/* table of devices that work with this driver */
143static struct usb_device_id iowarrior_ids[] = {
144 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW40)},
145 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW24)},
146 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOWPV1)},
147 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOWPV2)},
148 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW56)},
149 {} /* Terminating entry */
150};
151MODULE_DEVICE_TABLE(usb, iowarrior_ids);
152
153/*
154 * USB callback handler for reading data
155 */
156static void iowarrior_callback(struct urb *urb)
157{
158 struct iowarrior *dev = (struct iowarrior *)urb->context;
159 int intr_idx;
160 int read_idx;
161 int aux_idx;
162 int offset;
163 int status;
164
165 switch (urb->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 status = usb_submit_urb(urb, GFP_ATOMIC);
219 if (status)
220 dev_err(&dev->interface->dev, "%s - usb_submit_urb failed with result %d",
221 __FUNCTION__, status);
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 dev = (struct iowarrior *)urb->context;
232 /* sync/async unlink faults aren't errors */
233 if (urb->status &&
234 !(urb->status == -ENOENT ||
235 urb->status == -ECONNRESET || urb->status == -ESHUTDOWN)) {
236 dbg("%s - nonzero write bulk status received: %d",
237 __func__, urb->status);
238 }
239 /* free up our allocated buffer */
240 usb_buffer_free(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 */
250static inline void iowarrior_delete(struct iowarrior *dev)
251{
252 dbg("%s - minor %d", __func__, dev->minor);
253 kfree(dev->int_in_buffer);
254 usb_free_urb(dev->int_in_urb);
255 kfree(dev->read_queue);
256 kfree(dev);
257}
258
259/*---------------------*/
260/* fops implementation */
261/*---------------------*/
262
263static int read_index(struct iowarrior *dev)
264{
265 int intr_idx, read_idx;
266
267 read_idx = atomic_read(&dev->read_idx);
268 intr_idx = atomic_read(&dev->intr_idx);
269
270 return (read_idx == intr_idx ? -1 : read_idx);
271}
272
273/**
274 * iowarrior_read
275 */
276static ssize_t iowarrior_read(struct file *file, char __user *buffer,
277 size_t count, loff_t *ppos)
278{
279 struct iowarrior *dev;
280 int read_idx;
281 int offset;
282
283 dev = (struct iowarrior *)file->private_data;
284
285 /* verify that the device wasn't unplugged */
286 if (dev == NULL || !dev->present)
287 return -ENODEV;
288
289 dbg("%s - minor %d, count = %zd", __func__, dev->minor, count);
290
291 /* read count must be packet size (+ time stamp) */
292 if ((count != dev->report_size)
293 && (count != (dev->report_size + 1)))
294 return -EINVAL;
295
296 /* repeat until no buffer overrun in callback handler occur */
297 do {
298 atomic_set(&dev->overflow_flag, 0);
299 if ((read_idx = read_index(dev)) == -1) {
300 /* queue emty */
301 if (file->f_flags & O_NONBLOCK)
302 return -EAGAIN;
303 else {
304 //next line will return when there is either new data, or the device is unplugged
305 int r = wait_event_interruptible(dev->read_wait,
306 (!dev->present
307 || (read_idx =
308 read_index
309 (dev)) !=
310 -1));
311 if (r) {
312 //we were interrupted by a signal
313 return -ERESTART;
314 }
315 if (!dev->present) {
316 //The device was unplugged
317 return -ENODEV;
318 }
319 if (read_idx == -1) {
320 // Can this happen ???
321 return 0;
322 }
323 }
324 }
325
326 offset = read_idx * (dev->report_size + 1);
327 if (copy_to_user(buffer, dev->read_queue + offset, count)) {
328 return -EFAULT;
329 }
330 } while (atomic_read(&dev->overflow_flag));
331
332 read_idx = ++read_idx == MAX_INTERRUPT_BUFFER ? 0 : read_idx;
333 atomic_set(&dev->read_idx, read_idx);
334 return count;
335}
336
337/*
338 * iowarrior_write
339 */
340static ssize_t iowarrior_write(struct file *file,
341 const char __user *user_buffer,
342 size_t count, loff_t *ppos)
343{
344 struct iowarrior *dev;
345 int retval = 0;
346 char *buf = NULL; /* for IOW24 and IOW56 we need a buffer */
347 struct urb *int_out_urb = NULL;
348
349 dev = (struct iowarrior *)file->private_data;
350
351 mutex_lock(&dev->mutex);
352 /* verify that the device wasn't unplugged */
353 if (dev == NULL || !dev->present) {
354 retval = -ENODEV;
355 goto exit;
356 }
357 dbg("%s - minor %d, count = %zd", __func__, dev->minor, count);
358 /* if count is 0 we're already done */
359 if (count == 0) {
360 retval = 0;
361 goto exit;
362 }
363 /* We only accept full reports */
364 if (count != dev->report_size) {
365 retval = -EINVAL;
366 goto exit;
367 }
368 switch (dev->product_id) {
369 case USB_DEVICE_ID_CODEMERCS_IOW24:
370 case USB_DEVICE_ID_CODEMERCS_IOWPV1:
371 case USB_DEVICE_ID_CODEMERCS_IOWPV2:
372 case USB_DEVICE_ID_CODEMERCS_IOW40:
373 /* IOW24 and IOW40 use a synchronous call */
374 buf = kmalloc(8, GFP_KERNEL); /* 8 bytes are enough for both products */
375 if (!buf) {
376 retval = -ENOMEM;
377 goto exit;
378 }
379 if (copy_from_user(buf, user_buffer, count)) {
380 retval = -EFAULT;
381 kfree(buf);
382 goto exit;
383 }
384 retval = usb_set_report(dev->interface, 2, 0, buf, count);
385 kfree(buf);
386 goto exit;
387 break;
388 case USB_DEVICE_ID_CODEMERCS_IOW56:
389 /* The IOW56 uses asynchronous IO and more urbs */
390 if (atomic_read(&dev->write_busy) == MAX_WRITES_IN_FLIGHT) {
391 /* Wait until we are below the limit for submitted urbs */
392 if (file->f_flags & O_NONBLOCK) {
393 retval = -EAGAIN;
394 goto exit;
395 } else {
396 retval = wait_event_interruptible(dev->write_wait,
397 (!dev->present || (atomic_read (&dev-> write_busy) < MAX_WRITES_IN_FLIGHT)));
398 if (retval) {
399 /* we were interrupted by a signal */
400 retval = -ERESTART;
401 goto exit;
402 }
403 if (!dev->present) {
404 /* The device was unplugged */
405 retval = -ENODEV;
406 goto exit;
407 }
408 if (!dev->opened) {
409 /* We were closed while waiting for an URB */
410 retval = -ENODEV;
411 goto exit;
412 }
413 }
414 }
415 atomic_inc(&dev->write_busy);
416 int_out_urb = usb_alloc_urb(0, GFP_KERNEL);
417 if (!int_out_urb) {
418 retval = -ENOMEM;
419 dbg("%s Unable to allocate urb ", __func__);
420 goto error;
421 }
422 buf = usb_buffer_alloc(dev->udev, dev->report_size,
423 GFP_KERNEL, &int_out_urb->transfer_dma);
424 if (!buf) {
425 retval = -ENOMEM;
426 dbg("%s Unable to allocate buffer ", __func__);
427 goto error;
428 }
429 usb_fill_int_urb(int_out_urb, dev->udev,
430 usb_sndintpipe(dev->udev,
431 dev->int_out_endpoint->bEndpointAddress),
432 buf, dev->report_size,
433 iowarrior_write_callback, dev,
434 dev->int_out_endpoint->bInterval);
435 int_out_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
436 if (copy_from_user(buf, user_buffer, count)) {
437 retval = -EFAULT;
438 goto error;
439 }
440 retval = usb_submit_urb(int_out_urb, GFP_KERNEL);
441 if (retval) {
442 dbg("%s submit error %d for urb nr.%d", __func__,
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",
454 __FUNCTION__, dev->product_id);
455 retval = -EFAULT;
456 goto exit;
457 break;
458 }
459error:
460 usb_buffer_free(dev->udev, dev->report_size, buf,
461 int_out_urb->transfer_dma);
462 usb_free_urb(int_out_urb);
463 atomic_dec(&dev->write_busy);
464 wake_up_interruptible(&dev->write_wait);
465exit:
466 mutex_unlock(&dev->mutex);
467 return retval;
468}
469
470/**
471 * iowarrior_ioctl
472 */
473static int iowarrior_ioctl(struct inode *inode, struct file *file,
474 unsigned int cmd, unsigned long arg)
475{
476 struct iowarrior *dev = NULL;
477 __u8 *buffer;
478 __u8 __user *user_buffer;
479 int retval;
480 int io_res; /* checks for bytes read/written and copy_to/from_user results */
481
482 dev = (struct iowarrior *)file->private_data;
483 if (dev == NULL) {
484 return -ENODEV;
485 }
486
487 buffer = kzalloc(dev->report_size, GFP_KERNEL);
488 if (!buffer)
489 return -ENOMEM;
490
491 /* lock this object */
492 mutex_lock(&dev->mutex);
493
494 /* verify that the device wasn't unplugged */
495 if (!dev->present) {
496 mutex_unlock(&dev->mutex);
497 return -ENODEV;
498 }
499
500 dbg("%s - minor %d, cmd 0x%.4x, arg %ld", __func__, dev->minor, cmd,
501 arg);
502
503 retval = 0;
504 io_res = 0;
505 switch (cmd) {
506 case IOW_WRITE:
507 if (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW24 ||
508 dev->product_id == USB_DEVICE_ID_CODEMERCS_IOWPV1 ||
509 dev->product_id == USB_DEVICE_ID_CODEMERCS_IOWPV2 ||
510 dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW40) {
511 user_buffer = (__u8 __user *)arg;
512 io_res = copy_from_user(buffer, user_buffer,
513 dev->report_size);
514 if (io_res) {
515 retval = -EFAULT;
516 } else {
517 io_res = usb_set_report(dev->interface, 2, 0,
518 buffer,
519 dev->report_size);
520 if (io_res < 0)
521 retval = io_res;
522 }
523 } else {
524 retval = -EINVAL;
525 dev_err(&dev->interface->dev,
526 "ioctl 'IOW_WRITE' is not supported for product=0x%x.",
527 dev->product_id);
528 }
529 break;
530 case IOW_READ:
531 user_buffer = (__u8 __user *)arg;
532 io_res = usb_get_report(dev->udev,
533 dev->interface->cur_altsetting, 1, 0,
534 buffer, dev->report_size);
535 if (io_res < 0)
536 retval = io_res;
537 else {
538 io_res = copy_to_user(user_buffer, buffer, dev->report_size);
539 if (io_res < 0)
540 retval = -EFAULT;
541 }
542 break;
543 case IOW_GETINFO:
544 {
545 /* Report available information for the device */
546 struct iowarrior_info info;
547 /* needed for power consumption */
548 struct usb_config_descriptor *cfg_descriptor = &dev->udev->actconfig->desc;
549
550 /* directly from the descriptor */
551 info.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
552 info.product = dev->product_id;
553 info.revision = le16_to_cpu(dev->udev->descriptor.bcdDevice);
554
555 /* 0==UNKNOWN, 1==LOW(usb1.1) ,2=FULL(usb1.1), 3=HIGH(usb2.0) */
556 info.speed = le16_to_cpu(dev->udev->speed);
557 info.if_num = dev->interface->cur_altsetting->desc.bInterfaceNumber;
558 info.report_size = dev->report_size;
559
560 /* serial number string has been read earlier 8 chars or empty string */
561 memcpy(info.serial, dev->chip_serial,
562 sizeof(dev->chip_serial));
563 if (cfg_descriptor == NULL) {
564 info.power = -1; /* no information available */
565 } else {
566 /* the MaxPower is stored in units of 2mA to make it fit into a byte-value */
567 info.power = cfg_descriptor->bMaxPower * 2;
568 }
569 io_res = copy_to_user((struct iowarrior_info __user *)arg, &info,
570 sizeof(struct iowarrior_info));
571 if (io_res < 0)
572 retval = -EFAULT;
573 break;
574 }
575 default:
576 /* return that we did not understand this ioctl call */
577 retval = -ENOTTY;
578 break;
579 }
580
581 /* unlock the device */
582 mutex_unlock(&dev->mutex);
583 return retval;
584}
585
586/**
587 * iowarrior_open
588 */
589static int iowarrior_open(struct inode *inode, struct file *file)
590{
591 struct iowarrior *dev = NULL;
592 struct usb_interface *interface;
593 int subminor;
594 int retval = 0;
595
596 dbg("%s", __func__);
597
598 subminor = iminor(inode);
599
600 /* prevent disconnects */
601 down(&disconnect_sem);
602
603 interface = usb_find_interface(&iowarrior_driver, subminor);
604 if (!interface) {
605 err("%s - error, can't find device for minor %d", __FUNCTION__,
606 subminor);
607 retval = -ENODEV;
608 goto out;
609 }
610
611 dev = usb_get_intfdata(interface);
612 if (!dev) {
613 retval = -ENODEV;
614 goto out;
615 }
616
617 /* Only one process can open each device, no sharing. */
618 if (dev->opened) {
619 retval = -EBUSY;
620 goto out;
621 }
622
623 /* setup interrupt handler for receiving values */
624 if ((retval = usb_submit_urb(dev->int_in_urb, GFP_KERNEL)) < 0) {
625 dev_err(&interface->dev, "Error %d while submitting URB\n", retval);
626 retval = -EFAULT;
627 goto out;
628 }
629 /* increment our usage count for the driver */
630 ++dev->opened;
631 /* save our object in the file's private structure */
632 file->private_data = dev;
633 retval = 0;
634
635out:
636 up(&disconnect_sem);
637 return retval;
638}
639
640/**
641 * iowarrior_release
642 */
643static int iowarrior_release(struct inode *inode, struct file *file)
644{
645 struct iowarrior *dev;
646 int retval = 0;
647
648 dev = (struct iowarrior *)file->private_data;
649 if (dev == NULL) {
650 return -ENODEV;
651 }
652
653 dbg("%s - minor %d", __func__, dev->minor);
654
655 /* lock our device */
656 mutex_lock(&dev->mutex);
657
658 if (dev->opened <= 0) {
659 retval = -ENODEV; /* close called more than once */
660 mutex_unlock(&dev->mutex);
661 } else {
662 dev->opened = 0; /* we're closeing now */
663 retval = 0;
664 if (dev->present) {
665 /*
666 The device is still connected so we only shutdown
667 pending read-/write-ops.
668 */
669 usb_kill_urb(dev->int_in_urb);
670 wake_up_interruptible(&dev->read_wait);
671 wake_up_interruptible(&dev->write_wait);
672 mutex_unlock(&dev->mutex);
673 } else {
674 /* The device was unplugged, cleanup resources */
675 mutex_unlock(&dev->mutex);
676 iowarrior_delete(dev);
677 }
678 }
679 return retval;
680}
681
682static unsigned iowarrior_poll(struct file *file, poll_table * wait)
683{
684 struct iowarrior *dev = file->private_data;
685 unsigned int mask = 0;
686
687 if (!dev->present)
688 return POLLERR | POLLHUP;
689
690 poll_wait(file, &dev->read_wait, wait);
691 poll_wait(file, &dev->write_wait, wait);
692
693 if (!dev->present)
694 return POLLERR | POLLHUP;
695
696 if (read_index(dev) != -1)
697 mask |= POLLIN | POLLRDNORM;
698
699 if (atomic_read(&dev->write_busy) < MAX_WRITES_IN_FLIGHT)
700 mask |= POLLOUT | POLLWRNORM;
701 return mask;
702}
703
704/*
705 * File operations needed when we register this driver.
706 * This assumes that this driver NEEDS file operations,
707 * of course, which means that the driver is expected
708 * to have a node in the /dev directory. If the USB
709 * device were for a network interface then the driver
710 * would use "struct net_driver" instead, and a serial
711 * device would use "struct tty_driver".
712 */
713static struct file_operations iowarrior_fops = {
714 .owner = THIS_MODULE,
715 .write = iowarrior_write,
716 .read = iowarrior_read,
717 .ioctl = iowarrior_ioctl,
718 .open = iowarrior_open,
719 .release = iowarrior_release,
720 .poll = iowarrior_poll,
721};
722
723/*
724 * usb class driver info in order to get a minor number from the usb core,
725 * and to have the device registered with devfs and the driver core
726 */
727static struct usb_class_driver iowarrior_class = {
728 .name = "iowarrior%d",
729 .fops = &iowarrior_fops,
730 .minor_base = IOWARRIOR_MINOR_BASE,
731};
732
733/*---------------------------------*/
734/* probe and disconnect functions */
735/*---------------------------------*/
736/**
737 * iowarrior_probe
738 *
739 * Called by the usb core when a new device is connected that it thinks
740 * this driver might be interested in.
741 */
742static int iowarrior_probe(struct usb_interface *interface,
743 const struct usb_device_id *id)
744{
745 struct usb_device *udev = interface_to_usbdev(interface);
746 struct iowarrior *dev = NULL;
747 struct usb_host_interface *iface_desc;
748 struct usb_endpoint_descriptor *endpoint;
749 int i;
750 int retval = -ENOMEM;
751 int idele = 0;
752
753 /* allocate memory for our device state and intialize it */
754 dev = kzalloc(sizeof(struct iowarrior), GFP_KERNEL);
755 if (dev == NULL) {
756 dev_err(&interface->dev, "Out of memory");
757 return retval;
758 }
759
760 mutex_init(&dev->mutex);
761
762 atomic_set(&dev->intr_idx, 0);
763 atomic_set(&dev->read_idx, 0);
764 spin_lock_init(&dev->intr_idx_lock);
765 atomic_set(&dev->overflow_flag, 0);
766 init_waitqueue_head(&dev->read_wait);
767 atomic_set(&dev->write_busy, 0);
768 init_waitqueue_head(&dev->write_wait);
769
770 dev->udev = udev;
771 dev->interface = interface;
772
773 iface_desc = interface->cur_altsetting;
774 dev->product_id = le16_to_cpu(udev->descriptor.idProduct);
775
776 /* set up the endpoint information */
777 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
778 endpoint = &iface_desc->endpoint[i].desc;
779
780 if (usb_endpoint_is_int_in(endpoint))
781 dev->int_in_endpoint = endpoint;
782 if (usb_endpoint_is_int_out(endpoint))
783 /* this one will match for the IOWarrior56 only */
784 dev->int_out_endpoint = endpoint;
785 }
786 /* we have to check the report_size often, so remember it in the endianess suitable for our machine */
787 dev->report_size = le16_to_cpu(dev->int_in_endpoint->wMaxPacketSize);
788 if ((dev->interface->cur_altsetting->desc.bInterfaceNumber == 0) &&
789 (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW56))
790 /* IOWarrior56 has wMaxPacketSize different from report size */
791 dev->report_size = 7;
792
793 /* create the urb and buffer for reading */
794 dev->int_in_urb = usb_alloc_urb(0, GFP_KERNEL);
795 if (!dev->int_in_urb) {
796 dev_err(&interface->dev, "Couldn't allocate interrupt_in_urb\n");
797 goto error;
798 }
799 dev->int_in_buffer = kmalloc(dev->report_size, GFP_KERNEL);
800 if (!dev->int_in_buffer) {
801 dev_err(&interface->dev, "Couldn't allocate int_in_buffer\n");
802 goto error;
803 }
804 usb_fill_int_urb(dev->int_in_urb, dev->udev,
805 usb_rcvintpipe(dev->udev,
806 dev->int_in_endpoint->bEndpointAddress),
807 dev->int_in_buffer, dev->report_size,
808 iowarrior_callback, dev,
809 dev->int_in_endpoint->bInterval);
810 /* create an internal buffer for interrupt data from the device */
811 dev->read_queue =
812 kmalloc(((dev->report_size + 1) * MAX_INTERRUPT_BUFFER),
813 GFP_KERNEL);
814 if (!dev->read_queue) {
815 dev_err(&interface->dev, "Couldn't allocate read_queue\n");
816 goto error;
817 }
818 /* Get the serial-number of the chip */
819 memset(dev->chip_serial, 0x00, sizeof(dev->chip_serial));
820 usb_string(udev, udev->descriptor.iSerialNumber, dev->chip_serial,
821 sizeof(dev->chip_serial));
822 if (strlen(dev->chip_serial) != 8)
823 memset(dev->chip_serial, 0x00, sizeof(dev->chip_serial));
824
825 /* Set the idle timeout to 0, if this is interface 0 */
826 if (dev->interface->cur_altsetting->desc.bInterfaceNumber == 0) {
827 idele = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
828 0x0A,
829 USB_TYPE_CLASS | USB_RECIP_INTERFACE, 0,
830 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
831 dbg("idele = %d", idele);
832 }
833 /* allow device read and ioctl */
834 dev->present = 1;
835
836 /* we can register the device now, as it is ready */
837 usb_set_intfdata(interface, dev);
838
839 retval = usb_register_dev(interface, &iowarrior_class);
840 if (retval) {
841 /* something prevented us from registering this driver */
842 dev_err(&interface->dev, "Not able to get a minor for this device.\n");
843 usb_set_intfdata(interface, NULL);
844 goto error;
845 }
846
847 dev->minor = interface->minor;
848
849 /* let the user know what node this device is now attached to */
850 dev_info(&interface->dev, "IOWarrior product=0x%x, serial=%s interface=%d "
851 "now attached to iowarrior%d\n", dev->product_id, dev->chip_serial,
852 iface_desc->desc.bInterfaceNumber, dev->minor - IOWARRIOR_MINOR_BASE);
853 return retval;
854
855error:
856 iowarrior_delete(dev);
857 return retval;
858}
859
860/**
861 * iowarrior_disconnect
862 *
863 * Called by the usb core when the device is removed from the system.
864 */
865static void iowarrior_disconnect(struct usb_interface *interface)
866{
867 struct iowarrior *dev;
868 int minor;
869
870 /* prevent races with open() */
871 down(&disconnect_sem);
872
873 dev = usb_get_intfdata(interface);
874 usb_set_intfdata(interface, NULL);
875
876 mutex_lock(&dev->mutex);
877
878 minor = dev->minor;
879
880 /* give back our minor */
881 usb_deregister_dev(interface, &iowarrior_class);
882
883 /* prevent device read, write and ioctl */
884 dev->present = 0;
885
886 mutex_unlock(&dev->mutex);
887
888 if (dev->opened) {
889 /* There is a process that holds a filedescriptor to the device ,
890 so we only shutdown read-/write-ops going on.
891 Deleting the device is postponed until close() was called.
892 */
893 usb_kill_urb(dev->int_in_urb);
894 wake_up_interruptible(&dev->read_wait);
895 wake_up_interruptible(&dev->write_wait);
896 } else {
897 /* no process is using the device, cleanup now */
898 iowarrior_delete(dev);
899 }
900 up(&disconnect_sem);
901
902 dev_info(&interface->dev, "I/O-Warror #%d now disconnected\n",
903 minor - IOWARRIOR_MINOR_BASE);
904}
905
906/* usb specific object needed to register this driver with the usb subsystem */
907static struct usb_driver iowarrior_driver = {
908 .name = "iowarrior",
909 .probe = iowarrior_probe,
910 .disconnect = iowarrior_disconnect,
911 .id_table = iowarrior_ids,
912};
913
914static int __init iowarrior_init(void)
915{
916 return usb_register(&iowarrior_driver);
917}
918
919static void __exit iowarrior_exit(void)
920{
921 usb_deregister(&iowarrior_driver);
922}
923
924module_init(iowarrior_init);
925module_exit(iowarrior_exit);
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-14 14:13:24 -0500