Add missing newlines to some uses of dev_<level> messages
[deliverable/linux.git] / drivers / usb / misc / iowarrior.c
CommitLineData
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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/*--------------*/
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103
104/*
105 * USB spec identifies 5 second timeouts.
106 */
107#define GET_TIMEOUT 5
108#define USB_REQ_GET_REPORT 0x01
109//#if 0
110static int usb_get_report(struct usb_device *dev,
111 struct usb_host_interface *inter, unsigned char type,
112 unsigned char id, void *buf, int size)
113{
114 return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
115 USB_REQ_GET_REPORT,
116 USB_DIR_IN | USB_TYPE_CLASS |
117 USB_RECIP_INTERFACE, (type << 8) + id,
118 inter->desc.bInterfaceNumber, buf, size,
147c5a17 119 GET_TIMEOUT*HZ);
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120}
121//#endif
122
123#define USB_REQ_SET_REPORT 0x09
124
125static int usb_set_report(struct usb_interface *intf, unsigned char type,
126 unsigned char id, void *buf, int size)
127{
128 return usb_control_msg(interface_to_usbdev(intf),
129 usb_sndctrlpipe(interface_to_usbdev(intf), 0),
130 USB_REQ_SET_REPORT,
131 USB_TYPE_CLASS | USB_RECIP_INTERFACE,
132 (type << 8) + id,
133 intf->cur_altsetting->desc.bInterfaceNumber, buf,
147c5a17 134 size, HZ);
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135}
136
137/*---------------------*/
138/* driver registration */
139/*---------------------*/
140/* table of devices that work with this driver */
141static struct usb_device_id iowarrior_ids[] = {
142 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW40)},
143 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW24)},
144 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOWPV1)},
145 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOWPV2)},
146 {USB_DEVICE(USB_VENDOR_ID_CODEMERCS, USB_DEVICE_ID_CODEMERCS_IOW56)},
147 {} /* Terminating entry */
148};
149MODULE_DEVICE_TABLE(usb, iowarrior_ids);
150
151/*
152 * USB callback handler for reading data
153 */
154static void iowarrior_callback(struct urb *urb)
155{
156 struct iowarrior *dev = (struct iowarrior *)urb->context;
157 int intr_idx;
158 int read_idx;
159 int aux_idx;
160 int offset;
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161 int status = urb->status;
162 int retval;
946b960d 163
fb3abee6 164 switch (status) {
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165 case 0:
166 /* success */
167 break;
168 case -ECONNRESET:
169 case -ENOENT:
170 case -ESHUTDOWN:
171 return;
172 default:
173 goto exit;
174 }
175
176 spin_lock(&dev->intr_idx_lock);
177 intr_idx = atomic_read(&dev->intr_idx);
178 /* aux_idx become previous intr_idx */
179 aux_idx = (intr_idx == 0) ? (MAX_INTERRUPT_BUFFER - 1) : (intr_idx - 1);
180 read_idx = atomic_read(&dev->read_idx);
181
182 /* queue is not empty and it's interface 0 */
183 if ((intr_idx != read_idx)
184 && (dev->interface->cur_altsetting->desc.bInterfaceNumber == 0)) {
185 /* + 1 for serial number */
186 offset = aux_idx * (dev->report_size + 1);
187 if (!memcmp
188 (dev->read_queue + offset, urb->transfer_buffer,
189 dev->report_size)) {
190 /* equal values on interface 0 will be ignored */
191 spin_unlock(&dev->intr_idx_lock);
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 spin_unlock(&dev->intr_idx_lock);
213 /* tell the blocking read about the new data */
214 wake_up_interruptible(&dev->read_wait);
215
216exit:
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217 retval = usb_submit_urb(urb, GFP_ATOMIC);
218 if (retval)
898eb71c 219 dev_err(&dev->interface->dev, "%s - usb_submit_urb failed with result %d\n",
fb3abee6 220 __FUNCTION__, retval);
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221
222}
223
224/*
225 * USB Callback handler for write-ops
226 */
227static void iowarrior_write_callback(struct urb *urb)
228{
229 struct iowarrior *dev;
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230 int status = urb->status;
231
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232 dev = (struct iowarrior *)urb->context;
233 /* sync/async unlink faults aren't errors */
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234 if (status &&
235 !(status == -ENOENT ||
236 status == -ECONNRESET || status == -ESHUTDOWN)) {
946b960d 237 dbg("%s - nonzero write bulk status received: %d",
fb3abee6 238 __func__, status);
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239 }
240 /* free up our allocated buffer */
241 usb_buffer_free(urb->dev, urb->transfer_buffer_length,
242 urb->transfer_buffer, urb->transfer_dma);
243 /* tell a waiting writer the interrupt-out-pipe is available again */
244 atomic_dec(&dev->write_busy);
245 wake_up_interruptible(&dev->write_wait);
246}
247
248/**
249 * iowarrior_delete
250 */
251static inline void iowarrior_delete(struct iowarrior *dev)
252{
253 dbg("%s - minor %d", __func__, dev->minor);
254 kfree(dev->int_in_buffer);
255 usb_free_urb(dev->int_in_urb);
256 kfree(dev->read_queue);
257 kfree(dev);
258}
259
260/*---------------------*/
261/* fops implementation */
262/*---------------------*/
263
264static 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 */
277static 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 = (struct iowarrior *)file->private_data;
285
286 /* verify that the device wasn't unplugged */
287 if (dev == NULL || !dev->present)
288 return -ENODEV;
289
290 dbg("%s - minor %d, count = %zd", __func__, dev->minor, count);
291
292 /* read count must be packet size (+ time stamp) */
293 if ((count != dev->report_size)
294 && (count != (dev->report_size + 1)))
295 return -EINVAL;
296
297 /* repeat until no buffer overrun in callback handler occur */
298 do {
299 atomic_set(&dev->overflow_flag, 0);
300 if ((read_idx = read_index(dev)) == -1) {
301 /* queue emty */
302 if (file->f_flags & O_NONBLOCK)
303 return -EAGAIN;
304 else {
305 //next line will return when there is either new data, or the device is unplugged
306 int r = wait_event_interruptible(dev->read_wait,
307 (!dev->present
308 || (read_idx =
309 read_index
310 (dev)) !=
311 -1));
312 if (r) {
313 //we were interrupted by a signal
314 return -ERESTART;
315 }
316 if (!dev->present) {
317 //The device was unplugged
318 return -ENODEV;
319 }
320 if (read_idx == -1) {
321 // Can this happen ???
322 return 0;
323 }
324 }
325 }
326
327 offset = read_idx * (dev->report_size + 1);
328 if (copy_to_user(buffer, dev->read_queue + offset, count)) {
329 return -EFAULT;
330 }
331 } while (atomic_read(&dev->overflow_flag));
332
333 read_idx = ++read_idx == MAX_INTERRUPT_BUFFER ? 0 : read_idx;
334 atomic_set(&dev->read_idx, read_idx);
335 return count;
336}
337
338/*
339 * iowarrior_write
340 */
341static ssize_t iowarrior_write(struct file *file,
342 const char __user *user_buffer,
343 size_t count, loff_t *ppos)
344{
345 struct iowarrior *dev;
346 int retval = 0;
347 char *buf = NULL; /* for IOW24 and IOW56 we need a buffer */
348 struct urb *int_out_urb = NULL;
349
350 dev = (struct iowarrior *)file->private_data;
351
352 mutex_lock(&dev->mutex);
353 /* verify that the device wasn't unplugged */
354 if (dev == NULL || !dev->present) {
355 retval = -ENODEV;
356 goto exit;
357 }
358 dbg("%s - minor %d, count = %zd", __func__, dev->minor, count);
359 /* if count is 0 we're already done */
360 if (count == 0) {
361 retval = 0;
362 goto exit;
363 }
364 /* We only accept full reports */
365 if (count != dev->report_size) {
366 retval = -EINVAL;
367 goto exit;
368 }
369 switch (dev->product_id) {
370 case USB_DEVICE_ID_CODEMERCS_IOW24:
371 case USB_DEVICE_ID_CODEMERCS_IOWPV1:
372 case USB_DEVICE_ID_CODEMERCS_IOWPV2:
373 case USB_DEVICE_ID_CODEMERCS_IOW40:
374 /* IOW24 and IOW40 use a synchronous call */
375 buf = kmalloc(8, GFP_KERNEL); /* 8 bytes are enough for both products */
376 if (!buf) {
377 retval = -ENOMEM;
378 goto exit;
379 }
380 if (copy_from_user(buf, user_buffer, count)) {
381 retval = -EFAULT;
382 kfree(buf);
383 goto exit;
384 }
385 retval = usb_set_report(dev->interface, 2, 0, buf, count);
386 kfree(buf);
387 goto exit;
388 break;
389 case USB_DEVICE_ID_CODEMERCS_IOW56:
390 /* The IOW56 uses asynchronous IO and more urbs */
391 if (atomic_read(&dev->write_busy) == MAX_WRITES_IN_FLIGHT) {
392 /* Wait until we are below the limit for submitted urbs */
393 if (file->f_flags & O_NONBLOCK) {
394 retval = -EAGAIN;
395 goto exit;
396 } else {
397 retval = wait_event_interruptible(dev->write_wait,
398 (!dev->present || (atomic_read (&dev-> write_busy) < MAX_WRITES_IN_FLIGHT)));
399 if (retval) {
400 /* we were interrupted by a signal */
401 retval = -ERESTART;
402 goto exit;
403 }
404 if (!dev->present) {
405 /* The device was unplugged */
406 retval = -ENODEV;
407 goto exit;
408 }
409 if (!dev->opened) {
410 /* We were closed while waiting for an URB */
411 retval = -ENODEV;
412 goto exit;
413 }
414 }
415 }
416 atomic_inc(&dev->write_busy);
417 int_out_urb = usb_alloc_urb(0, GFP_KERNEL);
418 if (!int_out_urb) {
419 retval = -ENOMEM;
420 dbg("%s Unable to allocate urb ", __func__);
f81ee4d5 421 goto error_no_urb;
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422 }
423 buf = usb_buffer_alloc(dev->udev, dev->report_size,
424 GFP_KERNEL, &int_out_urb->transfer_dma);
425 if (!buf) {
426 retval = -ENOMEM;
427 dbg("%s Unable to allocate buffer ", __func__);
f81ee4d5 428 goto error_no_buffer;
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429 }
430 usb_fill_int_urb(int_out_urb, dev->udev,
431 usb_sndintpipe(dev->udev,
432 dev->int_out_endpoint->bEndpointAddress),
433 buf, dev->report_size,
434 iowarrior_write_callback, dev,
435 dev->int_out_endpoint->bInterval);
436 int_out_urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
437 if (copy_from_user(buf, user_buffer, count)) {
438 retval = -EFAULT;
439 goto error;
440 }
441 retval = usb_submit_urb(int_out_urb, GFP_KERNEL);
442 if (retval) {
443 dbg("%s submit error %d for urb nr.%d", __func__,
444 retval, atomic_read(&dev->write_busy));
445 goto error;
446 }
447 /* submit was ok */
448 retval = count;
449 usb_free_urb(int_out_urb);
450 goto exit;
451 break;
452 default:
453 /* what do we have here ? An unsupported Product-ID ? */
898eb71c 454 dev_err(&dev->interface->dev, "%s - not supported for product=0x%x\n",
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455 __FUNCTION__, dev->product_id);
456 retval = -EFAULT;
457 goto exit;
458 break;
459 }
460error:
461 usb_buffer_free(dev->udev, dev->report_size, buf,
462 int_out_urb->transfer_dma);
f81ee4d5 463error_no_buffer:
946b960d 464 usb_free_urb(int_out_urb);
f81ee4d5 465error_no_urb:
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466 atomic_dec(&dev->write_busy);
467 wake_up_interruptible(&dev->write_wait);
468exit:
469 mutex_unlock(&dev->mutex);
470 return retval;
471}
472
473/**
474 * iowarrior_ioctl
475 */
476static int iowarrior_ioctl(struct inode *inode, struct file *file,
477 unsigned int cmd, unsigned long arg)
478{
479 struct iowarrior *dev = NULL;
480 __u8 *buffer;
481 __u8 __user *user_buffer;
482 int retval;
483 int io_res; /* checks for bytes read/written and copy_to/from_user results */
484
485 dev = (struct iowarrior *)file->private_data;
486 if (dev == NULL) {
487 return -ENODEV;
488 }
489
490 buffer = kzalloc(dev->report_size, GFP_KERNEL);
491 if (!buffer)
492 return -ENOMEM;
493
494 /* lock this object */
495 mutex_lock(&dev->mutex);
496
497 /* verify that the device wasn't unplugged */
498 if (!dev->present) {
fc0f8fc9
ON
499 retval = -ENODEV;
500 goto error_out;
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501 }
502
503 dbg("%s - minor %d, cmd 0x%.4x, arg %ld", __func__, dev->minor, cmd,
504 arg);
505
506 retval = 0;
507 io_res = 0;
508 switch (cmd) {
509 case IOW_WRITE:
510 if (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW24 ||
511 dev->product_id == USB_DEVICE_ID_CODEMERCS_IOWPV1 ||
512 dev->product_id == USB_DEVICE_ID_CODEMERCS_IOWPV2 ||
513 dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW40) {
514 user_buffer = (__u8 __user *)arg;
515 io_res = copy_from_user(buffer, user_buffer,
516 dev->report_size);
517 if (io_res) {
518 retval = -EFAULT;
519 } else {
520 io_res = usb_set_report(dev->interface, 2, 0,
521 buffer,
522 dev->report_size);
523 if (io_res < 0)
524 retval = io_res;
525 }
526 } else {
527 retval = -EINVAL;
528 dev_err(&dev->interface->dev,
898eb71c 529 "ioctl 'IOW_WRITE' is not supported for product=0x%x.\n",
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530 dev->product_id);
531 }
532 break;
533 case IOW_READ:
534 user_buffer = (__u8 __user *)arg;
535 io_res = usb_get_report(dev->udev,
536 dev->interface->cur_altsetting, 1, 0,
537 buffer, dev->report_size);
538 if (io_res < 0)
539 retval = io_res;
540 else {
541 io_res = copy_to_user(user_buffer, buffer, dev->report_size);
542 if (io_res < 0)
543 retval = -EFAULT;
544 }
545 break;
546 case IOW_GETINFO:
547 {
548 /* Report available information for the device */
549 struct iowarrior_info info;
550 /* needed for power consumption */
551 struct usb_config_descriptor *cfg_descriptor = &dev->udev->actconfig->desc;
552
553 /* directly from the descriptor */
554 info.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
555 info.product = dev->product_id;
556 info.revision = le16_to_cpu(dev->udev->descriptor.bcdDevice);
557
558 /* 0==UNKNOWN, 1==LOW(usb1.1) ,2=FULL(usb1.1), 3=HIGH(usb2.0) */
559 info.speed = le16_to_cpu(dev->udev->speed);
560 info.if_num = dev->interface->cur_altsetting->desc.bInterfaceNumber;
561 info.report_size = dev->report_size;
562
563 /* serial number string has been read earlier 8 chars or empty string */
564 memcpy(info.serial, dev->chip_serial,
565 sizeof(dev->chip_serial));
566 if (cfg_descriptor == NULL) {
567 info.power = -1; /* no information available */
568 } else {
569 /* the MaxPower is stored in units of 2mA to make it fit into a byte-value */
570 info.power = cfg_descriptor->bMaxPower * 2;
571 }
572 io_res = copy_to_user((struct iowarrior_info __user *)arg, &info,
573 sizeof(struct iowarrior_info));
574 if (io_res < 0)
575 retval = -EFAULT;
576 break;
577 }
578 default:
579 /* return that we did not understand this ioctl call */
580 retval = -ENOTTY;
581 break;
582 }
fc0f8fc9 583error_out:
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584 /* unlock the device */
585 mutex_unlock(&dev->mutex);
fc0f8fc9 586 kfree(buffer);
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587 return retval;
588}
589
590/**
591 * iowarrior_open
592 */
593static int iowarrior_open(struct inode *inode, struct file *file)
594{
595 struct iowarrior *dev = NULL;
596 struct usb_interface *interface;
597 int subminor;
598 int retval = 0;
599
600 dbg("%s", __func__);
601
602 subminor = iminor(inode);
603
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604 interface = usb_find_interface(&iowarrior_driver, subminor);
605 if (!interface) {
606 err("%s - error, can't find device for minor %d", __FUNCTION__,
607 subminor);
d4ead16f 608 return -ENODEV;
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609 }
610
611 dev = usb_get_intfdata(interface);
d4ead16f
AS
612 if (!dev)
613 return -ENODEV;
614
615 mutex_lock(&dev->mutex);
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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:
d4ead16f 636 mutex_unlock(&dev->mutex);
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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;
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751
752 /* allocate memory for our device state and intialize it */
753 dev = kzalloc(sizeof(struct iowarrior), GFP_KERNEL);
754 if (dev == NULL) {
898eb71c 755 dev_err(&interface->dev, "Out of memory\n");
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756 return retval;
757 }
758
759 mutex_init(&dev->mutex);
760
761 atomic_set(&dev->intr_idx, 0);
762 atomic_set(&dev->read_idx, 0);
763 spin_lock_init(&dev->intr_idx_lock);
764 atomic_set(&dev->overflow_flag, 0);
765 init_waitqueue_head(&dev->read_wait);
766 atomic_set(&dev->write_busy, 0);
767 init_waitqueue_head(&dev->write_wait);
768
769 dev->udev = udev;
770 dev->interface = interface;
771
772 iface_desc = interface->cur_altsetting;
773 dev->product_id = le16_to_cpu(udev->descriptor.idProduct);
774
775 /* set up the endpoint information */
776 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
777 endpoint = &iface_desc->endpoint[i].desc;
778
779 if (usb_endpoint_is_int_in(endpoint))
780 dev->int_in_endpoint = endpoint;
781 if (usb_endpoint_is_int_out(endpoint))
782 /* this one will match for the IOWarrior56 only */
783 dev->int_out_endpoint = endpoint;
784 }
785 /* we have to check the report_size often, so remember it in the endianess suitable for our machine */
786 dev->report_size = le16_to_cpu(dev->int_in_endpoint->wMaxPacketSize);
787 if ((dev->interface->cur_altsetting->desc.bInterfaceNumber == 0) &&
788 (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW56))
789 /* IOWarrior56 has wMaxPacketSize different from report size */
790 dev->report_size = 7;
791
792 /* create the urb and buffer for reading */
793 dev->int_in_urb = usb_alloc_urb(0, GFP_KERNEL);
794 if (!dev->int_in_urb) {
795 dev_err(&interface->dev, "Couldn't allocate interrupt_in_urb\n");
796 goto error;
797 }
798 dev->int_in_buffer = kmalloc(dev->report_size, GFP_KERNEL);
799 if (!dev->int_in_buffer) {
800 dev_err(&interface->dev, "Couldn't allocate int_in_buffer\n");
801 goto error;
802 }
803 usb_fill_int_urb(dev->int_in_urb, dev->udev,
804 usb_rcvintpipe(dev->udev,
805 dev->int_in_endpoint->bEndpointAddress),
806 dev->int_in_buffer, dev->report_size,
807 iowarrior_callback, dev,
808 dev->int_in_endpoint->bInterval);
809 /* create an internal buffer for interrupt data from the device */
810 dev->read_queue =
811 kmalloc(((dev->report_size + 1) * MAX_INTERRUPT_BUFFER),
812 GFP_KERNEL);
813 if (!dev->read_queue) {
814 dev_err(&interface->dev, "Couldn't allocate read_queue\n");
815 goto error;
816 }
817 /* Get the serial-number of the chip */
818 memset(dev->chip_serial, 0x00, sizeof(dev->chip_serial));
819 usb_string(udev, udev->descriptor.iSerialNumber, dev->chip_serial,
820 sizeof(dev->chip_serial));
821 if (strlen(dev->chip_serial) != 8)
822 memset(dev->chip_serial, 0x00, sizeof(dev->chip_serial));
823
824 /* Set the idle timeout to 0, if this is interface 0 */
825 if (dev->interface->cur_altsetting->desc.bInterfaceNumber == 0) {
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826 usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
827 0x0A,
828 USB_TYPE_CLASS | USB_RECIP_INTERFACE, 0,
829 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
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830 }
831 /* allow device read and ioctl */
832 dev->present = 1;
833
834 /* we can register the device now, as it is ready */
835 usb_set_intfdata(interface, dev);
836
837 retval = usb_register_dev(interface, &iowarrior_class);
838 if (retval) {
839 /* something prevented us from registering this driver */
840 dev_err(&interface->dev, "Not able to get a minor for this device.\n");
841 usb_set_intfdata(interface, NULL);
842 goto error;
843 }
844
845 dev->minor = interface->minor;
846
847 /* let the user know what node this device is now attached to */
848 dev_info(&interface->dev, "IOWarrior product=0x%x, serial=%s interface=%d "
849 "now attached to iowarrior%d\n", dev->product_id, dev->chip_serial,
850 iface_desc->desc.bInterfaceNumber, dev->minor - IOWARRIOR_MINOR_BASE);
851 return retval;
852
853error:
854 iowarrior_delete(dev);
855 return retval;
856}
857
858/**
859 * iowarrior_disconnect
860 *
861 * Called by the usb core when the device is removed from the system.
862 */
863static void iowarrior_disconnect(struct usb_interface *interface)
864{
865 struct iowarrior *dev;
866 int minor;
867
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868 dev = usb_get_intfdata(interface);
869 usb_set_intfdata(interface, NULL);
870
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871 minor = dev->minor;
872
873 /* give back our minor */
874 usb_deregister_dev(interface, &iowarrior_class);
875
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876 mutex_lock(&dev->mutex);
877
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878 /* prevent device read, write and ioctl */
879 dev->present = 0;
880
881 mutex_unlock(&dev->mutex);
882
883 if (dev->opened) {
884 /* There is a process that holds a filedescriptor to the device ,
885 so we only shutdown read-/write-ops going on.
886 Deleting the device is postponed until close() was called.
887 */
888 usb_kill_urb(dev->int_in_urb);
889 wake_up_interruptible(&dev->read_wait);
890 wake_up_interruptible(&dev->write_wait);
891 } else {
892 /* no process is using the device, cleanup now */
893 iowarrior_delete(dev);
894 }
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895
896 dev_info(&interface->dev, "I/O-Warror #%d now disconnected\n",
897 minor - IOWARRIOR_MINOR_BASE);
898}
899
900/* usb specific object needed to register this driver with the usb subsystem */
901static struct usb_driver iowarrior_driver = {
902 .name = "iowarrior",
903 .probe = iowarrior_probe,
904 .disconnect = iowarrior_disconnect,
905 .id_table = iowarrior_ids,
906};
907
908static int __init iowarrior_init(void)
909{
910 return usb_register(&iowarrior_driver);
911}
912
913static void __exit iowarrior_exit(void)
914{
915 usb_deregister(&iowarrior_driver);
916}
917
918module_init(iowarrior_init);
919module_exit(iowarrior_exit);
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