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Full support for Ginger Console
[linux-ginger.git] / drivers / usb / misc / iowarrior.c
blobe75bb87ee92b87f39d67b883bb22f4f77fce3a79
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/smp_lock.h>
22 #include <linux/poll.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
59 MODULE_AUTHOR(DRIVER_AUTHOR);
60 MODULE_DESCRIPTION(DRIVER_DESC);
61 MODULE_LICENSE("GPL");
62
63 /* Module parameters */
64 static int debug = 0;
65 module_param(debug, bool, 0644);
66 MODULE_PARM_DESC(debug, "debug=1 enables debugging messages");
67
68 static struct usb_driver iowarrior_driver;
69 static DEFINE_MUTEX(iowarrior_open_disc_lock);
70
71 /*--------------*/
72 /* data */
73 /*--------------*/
74
75 /* Structure to hold all of our device specific stuff */
76 struct 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
111 static 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
126 static 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 */
142 static 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 };
150 MODULE_DEVICE_TABLE(usb, iowarrior_ids);
151
152 /*
153 * USB callback handler for reading data
154 */
155 static 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
217 exit:
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 */
228 static 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_buffer_free(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 */
252 static 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
265 static 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 */
278 static 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 = (struct iowarrior *)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 emty */
303 if (file->f_flags & O_NONBLOCK)
304 return -EAGAIN;
305 else {
306 //next line will return when there is either new data, or the device is unplugged
307 int r = wait_event_interruptible(dev->read_wait,
308 (!dev->present
309 || (read_idx =
310 read_index
311 (dev)) !=
312 -1));
313 if (r) {
314 //we were interrupted by a signal
315 return -ERESTART;
316 }
317 if (!dev->present) {
318 //The device was unplugged
319 return -ENODEV;
320 }
321 if (read_idx == -1) {
322 // Can this happen ???
323 return 0;
324 }
325 }
326 }
327
328 offset = read_idx * (dev->report_size + 1);
329 if (copy_to_user(buffer, dev->read_queue + offset, count)) {
330 return -EFAULT;
331 }
332 } while (atomic_read(&dev->overflow_flag));
333
334 read_idx = ++read_idx == MAX_INTERRUPT_BUFFER ? 0 : read_idx;
335 atomic_set(&dev->read_idx, read_idx);
336 return count;
337 }
338
339 /*
340 * iowarrior_write
341 */
342 static ssize_t iowarrior_write(struct file *file,
343 const char __user *user_buffer,
344 size_t count, loff_t *ppos)
345 {
346 struct iowarrior *dev;
347 int retval = 0;
348 char *buf = NULL; /* for IOW24 and IOW56 we need a buffer */
349 struct urb *int_out_urb = NULL;
350
351 dev = (struct iowarrior *)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(8, GFP_KERNEL); /* 8 bytes are enough for both products */
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_buffer_alloc(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 }
461 error:
462 usb_buffer_free(dev->udev, dev->report_size, buf,
463 int_out_urb->transfer_dma);
464 error_no_buffer:
465 usb_free_urb(int_out_urb);
466 error_no_urb:
467 atomic_dec(&dev->write_busy);
468 wake_up_interruptible(&dev->write_wait);
469 exit:
470 mutex_unlock(&dev->mutex);
471 return retval;
472 }
473
474 /**
475 * iowarrior_ioctl
476 */
477 static 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 = (struct iowarrior *)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 lock_kernel();
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 < 0)
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 /* directly from the descriptor */
556 info.vendor = le16_to_cpu(dev->udev->descriptor.idVendor);
557 info.product = dev->product_id;
558 info.revision = le16_to_cpu(dev->udev->descriptor.bcdDevice);
559
560 /* 0==UNKNOWN, 1==LOW(usb1.1) ,2=FULL(usb1.1), 3=HIGH(usb2.0) */
561 info.speed = le16_to_cpu(dev->udev->speed);
562 info.if_num = dev->interface->cur_altsetting->desc.bInterfaceNumber;
563 info.report_size = dev->report_size;
564
565 /* serial number string has been read earlier 8 chars or empty string */
566 memcpy(info.serial, dev->chip_serial,
567 sizeof(dev->chip_serial));
568 if (cfg_descriptor == NULL) {
569 info.power = -1; /* no information available */
570 } else {
571 /* the MaxPower is stored in units of 2mA to make it fit into a byte-value */
572 info.power = cfg_descriptor->bMaxPower * 2;
573 }
574 io_res = copy_to_user((struct iowarrior_info __user *)arg, &info,
575 sizeof(struct iowarrior_info));
576 if (io_res < 0)
577 retval = -EFAULT;
578 break;
579 }
580 default:
581 /* return that we did not understand this ioctl call */
582 retval = -ENOTTY;
583 break;
584 }
585 error_out:
586 /* unlock the device */
587 mutex_unlock(&dev->mutex);
588 unlock_kernel();
589 kfree(buffer);
590 return retval;
591 }
592
593 /**
594 * iowarrior_open
595 */
596 static int iowarrior_open(struct inode *inode, struct file *file)
597 {
598 struct iowarrior *dev = NULL;
599 struct usb_interface *interface;
600 int subminor;
601 int retval = 0;
602
603 dbg("%s", __func__);
604
605 subminor = iminor(inode);
606
607 interface = usb_find_interface(&iowarrior_driver, subminor);
608 if (!interface) {
609 err("%s - error, can't find device for minor %d", __func__,
610 subminor);
611 return -ENODEV;
612 }
613
614 mutex_lock(&iowarrior_open_disc_lock);
615 dev = usb_get_intfdata(interface);
616 if (!dev) {
617 mutex_unlock(&iowarrior_open_disc_lock);
618 return -ENODEV;
619 }
620
621 mutex_lock(&dev->mutex);
622 mutex_unlock(&iowarrior_open_disc_lock);
623
624 /* Only one process can open each device, no sharing. */
625 if (dev->opened) {
626 retval = -EBUSY;
627 goto out;
628 }
629
630 /* setup interrupt handler for receiving values */
631 if ((retval = usb_submit_urb(dev->int_in_urb, GFP_KERNEL)) < 0) {
632 dev_err(&interface->dev, "Error %d while submitting URB\n", retval);
633 retval = -EFAULT;
634 goto out;
635 }
636 /* increment our usage count for the driver */
637 ++dev->opened;
638 /* save our object in the file's private structure */
639 file->private_data = dev;
640 retval = 0;
641
642 out:
643 mutex_unlock(&dev->mutex);
644 return retval;
645 }
646
647 /**
648 * iowarrior_release
649 */
650 static int iowarrior_release(struct inode *inode, struct file *file)
651 {
652 struct iowarrior *dev;
653 int retval = 0;
654
655 dev = (struct iowarrior *)file->private_data;
656 if (dev == NULL) {
657 return -ENODEV;
658 }
659
660 dbg("%s - minor %d", __func__, dev->minor);
661
662 /* lock our device */
663 mutex_lock(&dev->mutex);
664
665 if (dev->opened <= 0) {
666 retval = -ENODEV; /* close called more than once */
667 mutex_unlock(&dev->mutex);
668 } else {
669 dev->opened = 0; /* we're closeing now */
670 retval = 0;
671 if (dev->present) {
672 /*
673 The device is still connected so we only shutdown
674 pending read-/write-ops.
675 */
676 usb_kill_urb(dev->int_in_urb);
677 wake_up_interruptible(&dev->read_wait);
678 wake_up_interruptible(&dev->write_wait);
679 mutex_unlock(&dev->mutex);
680 } else {
681 /* The device was unplugged, cleanup resources */
682 mutex_unlock(&dev->mutex);
683 iowarrior_delete(dev);
684 }
685 }
686 return retval;
687 }
688
689 static unsigned iowarrior_poll(struct file *file, poll_table * wait)
690 {
691 struct iowarrior *dev = file->private_data;
692 unsigned int mask = 0;
693
694 if (!dev->present)
695 return POLLERR | POLLHUP;
696
697 poll_wait(file, &dev->read_wait, wait);
698 poll_wait(file, &dev->write_wait, wait);
699
700 if (!dev->present)
701 return POLLERR | POLLHUP;
702
703 if (read_index(dev) != -1)
704 mask |= POLLIN | POLLRDNORM;
705
706 if (atomic_read(&dev->write_busy) < MAX_WRITES_IN_FLIGHT)
707 mask |= POLLOUT | POLLWRNORM;
708 return mask;
709 }
710
711 /*
712 * File operations needed when we register this driver.
713 * This assumes that this driver NEEDS file operations,
714 * of course, which means that the driver is expected
715 * to have a node in the /dev directory. If the USB
716 * device were for a network interface then the driver
717 * would use "struct net_driver" instead, and a serial
718 * device would use "struct tty_driver".
719 */
720 static const struct file_operations iowarrior_fops = {
721 .owner = THIS_MODULE,
722 .write = iowarrior_write,
723 .read = iowarrior_read,
724 .unlocked_ioctl = iowarrior_ioctl,
725 .open = iowarrior_open,
726 .release = iowarrior_release,
727 .poll = iowarrior_poll,
728 };
729
730 static char *iowarrior_devnode(struct device *dev, mode_t *mode)
731 {
732 return kasprintf(GFP_KERNEL, "usb/%s", dev_name(dev));
733 }
734
735 /*
736 * usb class driver info in order to get a minor number from the usb core,
737 * and to have the device registered with devfs and the driver core
738 */
739 static struct usb_class_driver iowarrior_class = {
740 .name = "iowarrior%d",
741 .devnode = iowarrior_devnode,
742 .fops = &iowarrior_fops,
743 .minor_base = IOWARRIOR_MINOR_BASE,
744 };
745
746 /*---------------------------------*/
747 /* probe and disconnect functions */
748 /*---------------------------------*/
749 /**
750 * iowarrior_probe
751 *
752 * Called by the usb core when a new device is connected that it thinks
753 * this driver might be interested in.
754 */
755 static int iowarrior_probe(struct usb_interface *interface,
756 const struct usb_device_id *id)
757 {
758 struct usb_device *udev = interface_to_usbdev(interface);
759 struct iowarrior *dev = NULL;
760 struct usb_host_interface *iface_desc;
761 struct usb_endpoint_descriptor *endpoint;
762 int i;
763 int retval = -ENOMEM;
764
765 /* allocate memory for our device state and intialize it */
766 dev = kzalloc(sizeof(struct iowarrior), GFP_KERNEL);
767 if (dev == NULL) {
768 dev_err(&interface->dev, "Out of memory\n");
769 return retval;
770 }
771
772 mutex_init(&dev->mutex);
773
774 atomic_set(&dev->intr_idx, 0);
775 atomic_set(&dev->read_idx, 0);
776 spin_lock_init(&dev->intr_idx_lock);
777 atomic_set(&dev->overflow_flag, 0);
778 init_waitqueue_head(&dev->read_wait);
779 atomic_set(&dev->write_busy, 0);
780 init_waitqueue_head(&dev->write_wait);
781
782 dev->udev = udev;
783 dev->interface = interface;
784
785 iface_desc = interface->cur_altsetting;
786 dev->product_id = le16_to_cpu(udev->descriptor.idProduct);
787
788 /* set up the endpoint information */
789 for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
790 endpoint = &iface_desc->endpoint[i].desc;
791
792 if (usb_endpoint_is_int_in(endpoint))
793 dev->int_in_endpoint = endpoint;
794 if (usb_endpoint_is_int_out(endpoint))
795 /* this one will match for the IOWarrior56 only */
796 dev->int_out_endpoint = endpoint;
797 }
798 /* we have to check the report_size often, so remember it in the endianess suitable for our machine */
799 dev->report_size = le16_to_cpu(dev->int_in_endpoint->wMaxPacketSize);
800 if ((dev->interface->cur_altsetting->desc.bInterfaceNumber == 0) &&
801 (dev->product_id == USB_DEVICE_ID_CODEMERCS_IOW56))
802 /* IOWarrior56 has wMaxPacketSize different from report size */
803 dev->report_size = 7;
804
805 /* create the urb and buffer for reading */
806 dev->int_in_urb = usb_alloc_urb(0, GFP_KERNEL);
807 if (!dev->int_in_urb) {
808 dev_err(&interface->dev, "Couldn't allocate interrupt_in_urb\n");
809 goto error;
810 }
811 dev->int_in_buffer = kmalloc(dev->report_size, GFP_KERNEL);
812 if (!dev->int_in_buffer) {
813 dev_err(&interface->dev, "Couldn't allocate int_in_buffer\n");
814 goto error;
815 }
816 usb_fill_int_urb(dev->int_in_urb, dev->udev,
817 usb_rcvintpipe(dev->udev,
818 dev->int_in_endpoint->bEndpointAddress),
819 dev->int_in_buffer, dev->report_size,
820 iowarrior_callback, dev,
821 dev->int_in_endpoint->bInterval);
822 /* create an internal buffer for interrupt data from the device */
823 dev->read_queue =
824 kmalloc(((dev->report_size + 1) * MAX_INTERRUPT_BUFFER),
825 GFP_KERNEL);
826 if (!dev->read_queue) {
827 dev_err(&interface->dev, "Couldn't allocate read_queue\n");
828 goto error;
829 }
830 /* Get the serial-number of the chip */
831 memset(dev->chip_serial, 0x00, sizeof(dev->chip_serial));
832 usb_string(udev, udev->descriptor.iSerialNumber, dev->chip_serial,
833 sizeof(dev->chip_serial));
834 if (strlen(dev->chip_serial) != 8)
835 memset(dev->chip_serial, 0x00, sizeof(dev->chip_serial));
836
837 /* Set the idle timeout to 0, if this is interface 0 */
838 if (dev->interface->cur_altsetting->desc.bInterfaceNumber == 0) {
839 usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
840 0x0A,
841 USB_TYPE_CLASS | USB_RECIP_INTERFACE, 0,
842 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
843 }
844 /* allow device read and ioctl */
845 dev->present = 1;
846
847 /* we can register the device now, as it is ready */
848 usb_set_intfdata(interface, dev);
849
850 retval = usb_register_dev(interface, &iowarrior_class);
851 if (retval) {
852 /* something prevented us from registering this driver */
853 dev_err(&interface->dev, "Not able to get a minor for this device.\n");
854 usb_set_intfdata(interface, NULL);
855 goto error;
856 }
857
858 dev->minor = interface->minor;
859
860 /* let the user know what node this device is now attached to */
861 dev_info(&interface->dev, "IOWarrior product=0x%x, serial=%s interface=%d "
862 "now attached to iowarrior%d\n", dev->product_id, dev->chip_serial,
863 iface_desc->desc.bInterfaceNumber, dev->minor - IOWARRIOR_MINOR_BASE);
864 return retval;
865
866 error:
867 iowarrior_delete(dev);
868 return retval;
869 }
870
871 /**
872 * iowarrior_disconnect
873 *
874 * Called by the usb core when the device is removed from the system.
875 */
876 static void iowarrior_disconnect(struct usb_interface *interface)
877 {
878 struct iowarrior *dev;
879 int minor;
880
881 dev = usb_get_intfdata(interface);
882 mutex_lock(&iowarrior_open_disc_lock);
883 usb_set_intfdata(interface, NULL);
884
885 minor = dev->minor;
886
887 /* give back our minor */
888 usb_deregister_dev(interface, &iowarrior_class);
889
890 mutex_lock(&dev->mutex);
891
892 /* prevent device read, write and ioctl */
893 dev->present = 0;
894
895 mutex_unlock(&dev->mutex);
896 mutex_unlock(&iowarrior_open_disc_lock);
897
898 if (dev->opened) {
899 /* There is a process that holds a filedescriptor to the device ,
900 so we only shutdown read-/write-ops going on.
901 Deleting the device is postponed until close() was called.
902 */
903 usb_kill_urb(dev->int_in_urb);
904 wake_up_interruptible(&dev->read_wait);
905 wake_up_interruptible(&dev->write_wait);
906 } else {
907 /* no process is using the device, cleanup now */
908 iowarrior_delete(dev);
909 }
910
911 dev_info(&interface->dev, "I/O-Warror #%d now disconnected\n",
912 minor - IOWARRIOR_MINOR_BASE);
913 }
914
915 /* usb specific object needed to register this driver with the usb subsystem */
916 static struct usb_driver iowarrior_driver = {
917 .name = "iowarrior",
918 .probe = iowarrior_probe,
919 .disconnect = iowarrior_disconnect,
920 .id_table = iowarrior_ids,
921 };
922
923 static int __init iowarrior_init(void)
924 {
925 return usb_register(&iowarrior_driver);
926 }
927
928 static void __exit iowarrior_exit(void)
929 {
930 usb_deregister(&iowarrior_driver);
931 }
932
933 module_init(iowarrior_init);
934 module_exit(iowarrior_exit);
Linux for Ginger Game Console