Merge branch 'kvm-updates/2.6.28' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6] / drivers / firewire / fw-cdev.c
1 /*
2  * Char device for device raw access
3  *
4  * Copyright (C) 2005-2007  Kristian Hoegsberg <krh@bitplanet.net>
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or
9  * (at your option) any later version.
10  *
11  * This program is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  * GNU General Public License for more details.
15  *
16  * You should have received a copy of the GNU General Public License
17  * along with this program; if not, write to the Free Software Foundation,
18  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19  */
20
21 #include <linux/module.h>
22 #include <linux/kernel.h>
23 #include <linux/wait.h>
24 #include <linux/errno.h>
25 #include <linux/device.h>
26 #include <linux/vmalloc.h>
27 #include <linux/poll.h>
28 #include <linux/preempt.h>
29 #include <linux/time.h>
30 #include <linux/delay.h>
31 #include <linux/mm.h>
32 #include <linux/idr.h>
33 #include <linux/compat.h>
34 #include <linux/firewire-cdev.h>
35 #include <asm/system.h>
36 #include <asm/uaccess.h>
37 #include "fw-transaction.h"
38 #include "fw-topology.h"
39 #include "fw-device.h"
40
41 struct client;
42 struct client_resource {
43         struct list_head link;
44         void (*release)(struct client *client, struct client_resource *r);
45         u32 handle;
46 };
47
48 /*
49  * dequeue_event() just kfree()'s the event, so the event has to be
50  * the first field in the struct.
51  */
52
53 struct event {
54         struct { void *data; size_t size; } v[2];
55         struct list_head link;
56 };
57
58 struct bus_reset {
59         struct event event;
60         struct fw_cdev_event_bus_reset reset;
61 };
62
63 struct response {
64         struct event event;
65         struct fw_transaction transaction;
66         struct client *client;
67         struct client_resource resource;
68         struct fw_cdev_event_response response;
69 };
70
71 struct iso_interrupt {
72         struct event event;
73         struct fw_cdev_event_iso_interrupt interrupt;
74 };
75
76 struct client {
77         u32 version;
78         struct fw_device *device;
79         spinlock_t lock;
80         u32 resource_handle;
81         struct list_head resource_list;
82         struct list_head event_list;
83         wait_queue_head_t wait;
84         u64 bus_reset_closure;
85
86         struct fw_iso_context *iso_context;
87         u64 iso_closure;
88         struct fw_iso_buffer buffer;
89         unsigned long vm_start;
90
91         struct list_head link;
92 };
93
94 static inline void __user *
95 u64_to_uptr(__u64 value)
96 {
97         return (void __user *)(unsigned long)value;
98 }
99
100 static inline __u64
101 uptr_to_u64(void __user *ptr)
102 {
103         return (__u64)(unsigned long)ptr;
104 }
105
106 static int fw_device_op_open(struct inode *inode, struct file *file)
107 {
108         struct fw_device *device;
109         struct client *client;
110         unsigned long flags;
111
112         device = fw_device_get_by_devt(inode->i_rdev);
113         if (device == NULL)
114                 return -ENODEV;
115
116         if (fw_device_is_shutdown(device)) {
117                 fw_device_put(device);
118                 return -ENODEV;
119         }
120
121         client = kzalloc(sizeof(*client), GFP_KERNEL);
122         if (client == NULL) {
123                 fw_device_put(device);
124                 return -ENOMEM;
125         }
126
127         client->device = device;
128         INIT_LIST_HEAD(&client->event_list);
129         INIT_LIST_HEAD(&client->resource_list);
130         spin_lock_init(&client->lock);
131         init_waitqueue_head(&client->wait);
132
133         file->private_data = client;
134
135         spin_lock_irqsave(&device->card->lock, flags);
136         list_add_tail(&client->link, &device->client_list);
137         spin_unlock_irqrestore(&device->card->lock, flags);
138
139         return 0;
140 }
141
142 static void queue_event(struct client *client, struct event *event,
143                         void *data0, size_t size0, void *data1, size_t size1)
144 {
145         unsigned long flags;
146
147         event->v[0].data = data0;
148         event->v[0].size = size0;
149         event->v[1].data = data1;
150         event->v[1].size = size1;
151
152         spin_lock_irqsave(&client->lock, flags);
153         list_add_tail(&event->link, &client->event_list);
154         spin_unlock_irqrestore(&client->lock, flags);
155
156         wake_up_interruptible(&client->wait);
157 }
158
159 static int
160 dequeue_event(struct client *client, char __user *buffer, size_t count)
161 {
162         unsigned long flags;
163         struct event *event;
164         size_t size, total;
165         int i, retval;
166
167         retval = wait_event_interruptible(client->wait,
168                                           !list_empty(&client->event_list) ||
169                                           fw_device_is_shutdown(client->device));
170         if (retval < 0)
171                 return retval;
172
173         if (list_empty(&client->event_list) &&
174                        fw_device_is_shutdown(client->device))
175                 return -ENODEV;
176
177         spin_lock_irqsave(&client->lock, flags);
178         event = container_of(client->event_list.next, struct event, link);
179         list_del(&event->link);
180         spin_unlock_irqrestore(&client->lock, flags);
181
182         total = 0;
183         for (i = 0; i < ARRAY_SIZE(event->v) && total < count; i++) {
184                 size = min(event->v[i].size, count - total);
185                 if (copy_to_user(buffer + total, event->v[i].data, size)) {
186                         retval = -EFAULT;
187                         goto out;
188                 }
189                 total += size;
190         }
191         retval = total;
192
193  out:
194         kfree(event);
195
196         return retval;
197 }
198
199 static ssize_t
200 fw_device_op_read(struct file *file,
201                   char __user *buffer, size_t count, loff_t *offset)
202 {
203         struct client *client = file->private_data;
204
205         return dequeue_event(client, buffer, count);
206 }
207
208 /* caller must hold card->lock so that node pointers can be dereferenced here */
209 static void
210 fill_bus_reset_event(struct fw_cdev_event_bus_reset *event,
211                      struct client *client)
212 {
213         struct fw_card *card = client->device->card;
214
215         event->closure       = client->bus_reset_closure;
216         event->type          = FW_CDEV_EVENT_BUS_RESET;
217         event->generation    = client->device->generation;
218         event->node_id       = client->device->node_id;
219         event->local_node_id = card->local_node->node_id;
220         event->bm_node_id    = 0; /* FIXME: We don't track the BM. */
221         event->irm_node_id   = card->irm_node->node_id;
222         event->root_node_id  = card->root_node->node_id;
223 }
224
225 static void
226 for_each_client(struct fw_device *device,
227                 void (*callback)(struct client *client))
228 {
229         struct fw_card *card = device->card;
230         struct client *c;
231         unsigned long flags;
232
233         spin_lock_irqsave(&card->lock, flags);
234
235         list_for_each_entry(c, &device->client_list, link)
236                 callback(c);
237
238         spin_unlock_irqrestore(&card->lock, flags);
239 }
240
241 static void
242 queue_bus_reset_event(struct client *client)
243 {
244         struct bus_reset *bus_reset;
245
246         bus_reset = kzalloc(sizeof(*bus_reset), GFP_ATOMIC);
247         if (bus_reset == NULL) {
248                 fw_notify("Out of memory when allocating bus reset event\n");
249                 return;
250         }
251
252         fill_bus_reset_event(&bus_reset->reset, client);
253
254         queue_event(client, &bus_reset->event,
255                     &bus_reset->reset, sizeof(bus_reset->reset), NULL, 0);
256 }
257
258 void fw_device_cdev_update(struct fw_device *device)
259 {
260         for_each_client(device, queue_bus_reset_event);
261 }
262
263 static void wake_up_client(struct client *client)
264 {
265         wake_up_interruptible(&client->wait);
266 }
267
268 void fw_device_cdev_remove(struct fw_device *device)
269 {
270         for_each_client(device, wake_up_client);
271 }
272
273 static int ioctl_get_info(struct client *client, void *buffer)
274 {
275         struct fw_cdev_get_info *get_info = buffer;
276         struct fw_cdev_event_bus_reset bus_reset;
277         struct fw_card *card = client->device->card;
278         unsigned long ret = 0;
279
280         client->version = get_info->version;
281         get_info->version = FW_CDEV_VERSION;
282
283         down_read(&fw_device_rwsem);
284
285         if (get_info->rom != 0) {
286                 void __user *uptr = u64_to_uptr(get_info->rom);
287                 size_t want = get_info->rom_length;
288                 size_t have = client->device->config_rom_length * 4;
289
290                 ret = copy_to_user(uptr, client->device->config_rom,
291                                    min(want, have));
292         }
293         get_info->rom_length = client->device->config_rom_length * 4;
294
295         up_read(&fw_device_rwsem);
296
297         if (ret != 0)
298                 return -EFAULT;
299
300         client->bus_reset_closure = get_info->bus_reset_closure;
301         if (get_info->bus_reset != 0) {
302                 void __user *uptr = u64_to_uptr(get_info->bus_reset);
303                 unsigned long flags;
304
305                 spin_lock_irqsave(&card->lock, flags);
306                 fill_bus_reset_event(&bus_reset, client);
307                 spin_unlock_irqrestore(&card->lock, flags);
308
309                 if (copy_to_user(uptr, &bus_reset, sizeof(bus_reset)))
310                         return -EFAULT;
311         }
312
313         get_info->card = card->index;
314
315         return 0;
316 }
317
318 static void
319 add_client_resource(struct client *client, struct client_resource *resource)
320 {
321         unsigned long flags;
322
323         spin_lock_irqsave(&client->lock, flags);
324         list_add_tail(&resource->link, &client->resource_list);
325         resource->handle = client->resource_handle++;
326         spin_unlock_irqrestore(&client->lock, flags);
327 }
328
329 static int
330 release_client_resource(struct client *client, u32 handle,
331                         struct client_resource **resource)
332 {
333         struct client_resource *r;
334         unsigned long flags;
335
336         spin_lock_irqsave(&client->lock, flags);
337         list_for_each_entry(r, &client->resource_list, link) {
338                 if (r->handle == handle) {
339                         list_del(&r->link);
340                         break;
341                 }
342         }
343         spin_unlock_irqrestore(&client->lock, flags);
344
345         if (&r->link == &client->resource_list)
346                 return -EINVAL;
347
348         if (resource)
349                 *resource = r;
350         else
351                 r->release(client, r);
352
353         return 0;
354 }
355
356 static void
357 release_transaction(struct client *client, struct client_resource *resource)
358 {
359         struct response *response =
360                 container_of(resource, struct response, resource);
361
362         fw_cancel_transaction(client->device->card, &response->transaction);
363 }
364
365 static void
366 complete_transaction(struct fw_card *card, int rcode,
367                      void *payload, size_t length, void *data)
368 {
369         struct response *response = data;
370         struct client *client = response->client;
371         unsigned long flags;
372         struct fw_cdev_event_response *r = &response->response;
373
374         if (length < r->length)
375                 r->length = length;
376         if (rcode == RCODE_COMPLETE)
377                 memcpy(r->data, payload, r->length);
378
379         spin_lock_irqsave(&client->lock, flags);
380         list_del(&response->resource.link);
381         spin_unlock_irqrestore(&client->lock, flags);
382
383         r->type   = FW_CDEV_EVENT_RESPONSE;
384         r->rcode  = rcode;
385
386         /*
387          * In the case that sizeof(*r) doesn't align with the position of the
388          * data, and the read is short, preserve an extra copy of the data
389          * to stay compatible with a pre-2.6.27 bug.  Since the bug is harmless
390          * for short reads and some apps depended on it, this is both safe
391          * and prudent for compatibility.
392          */
393         if (r->length <= sizeof(*r) - offsetof(typeof(*r), data))
394                 queue_event(client, &response->event, r, sizeof(*r),
395                             r->data, r->length);
396         else
397                 queue_event(client, &response->event, r, sizeof(*r) + r->length,
398                             NULL, 0);
399 }
400
401 static int ioctl_send_request(struct client *client, void *buffer)
402 {
403         struct fw_device *device = client->device;
404         struct fw_cdev_send_request *request = buffer;
405         struct response *response;
406
407         /* What is the biggest size we'll accept, really? */
408         if (request->length > 4096)
409                 return -EINVAL;
410
411         response = kmalloc(sizeof(*response) + request->length, GFP_KERNEL);
412         if (response == NULL)
413                 return -ENOMEM;
414
415         response->client = client;
416         response->response.length = request->length;
417         response->response.closure = request->closure;
418
419         if (request->data &&
420             copy_from_user(response->response.data,
421                            u64_to_uptr(request->data), request->length)) {
422                 kfree(response);
423                 return -EFAULT;
424         }
425
426         response->resource.release = release_transaction;
427         add_client_resource(client, &response->resource);
428
429         fw_send_request(device->card, &response->transaction,
430                         request->tcode & 0x1f,
431                         device->node->node_id,
432                         request->generation,
433                         device->max_speed,
434                         request->offset,
435                         response->response.data, request->length,
436                         complete_transaction, response);
437
438         if (request->data)
439                 return sizeof(request) + request->length;
440         else
441                 return sizeof(request);
442 }
443
444 struct address_handler {
445         struct fw_address_handler handler;
446         __u64 closure;
447         struct client *client;
448         struct client_resource resource;
449 };
450
451 struct request {
452         struct fw_request *request;
453         void *data;
454         size_t length;
455         struct client_resource resource;
456 };
457
458 struct request_event {
459         struct event event;
460         struct fw_cdev_event_request request;
461 };
462
463 static void
464 release_request(struct client *client, struct client_resource *resource)
465 {
466         struct request *request =
467                 container_of(resource, struct request, resource);
468
469         fw_send_response(client->device->card, request->request,
470                          RCODE_CONFLICT_ERROR);
471         kfree(request);
472 }
473
474 static void
475 handle_request(struct fw_card *card, struct fw_request *r,
476                int tcode, int destination, int source,
477                int generation, int speed,
478                unsigned long long offset,
479                void *payload, size_t length, void *callback_data)
480 {
481         struct address_handler *handler = callback_data;
482         struct request *request;
483         struct request_event *e;
484         struct client *client = handler->client;
485
486         request = kmalloc(sizeof(*request), GFP_ATOMIC);
487         e = kmalloc(sizeof(*e), GFP_ATOMIC);
488         if (request == NULL || e == NULL) {
489                 kfree(request);
490                 kfree(e);
491                 fw_send_response(card, r, RCODE_CONFLICT_ERROR);
492                 return;
493         }
494
495         request->request = r;
496         request->data    = payload;
497         request->length  = length;
498
499         request->resource.release = release_request;
500         add_client_resource(client, &request->resource);
501
502         e->request.type    = FW_CDEV_EVENT_REQUEST;
503         e->request.tcode   = tcode;
504         e->request.offset  = offset;
505         e->request.length  = length;
506         e->request.handle  = request->resource.handle;
507         e->request.closure = handler->closure;
508
509         queue_event(client, &e->event,
510                     &e->request, sizeof(e->request), payload, length);
511 }
512
513 static void
514 release_address_handler(struct client *client,
515                         struct client_resource *resource)
516 {
517         struct address_handler *handler =
518                 container_of(resource, struct address_handler, resource);
519
520         fw_core_remove_address_handler(&handler->handler);
521         kfree(handler);
522 }
523
524 static int ioctl_allocate(struct client *client, void *buffer)
525 {
526         struct fw_cdev_allocate *request = buffer;
527         struct address_handler *handler;
528         struct fw_address_region region;
529
530         handler = kmalloc(sizeof(*handler), GFP_KERNEL);
531         if (handler == NULL)
532                 return -ENOMEM;
533
534         region.start = request->offset;
535         region.end = request->offset + request->length;
536         handler->handler.length = request->length;
537         handler->handler.address_callback = handle_request;
538         handler->handler.callback_data = handler;
539         handler->closure = request->closure;
540         handler->client = client;
541
542         if (fw_core_add_address_handler(&handler->handler, &region) < 0) {
543                 kfree(handler);
544                 return -EBUSY;
545         }
546
547         handler->resource.release = release_address_handler;
548         add_client_resource(client, &handler->resource);
549         request->handle = handler->resource.handle;
550
551         return 0;
552 }
553
554 static int ioctl_deallocate(struct client *client, void *buffer)
555 {
556         struct fw_cdev_deallocate *request = buffer;
557
558         return release_client_resource(client, request->handle, NULL);
559 }
560
561 static int ioctl_send_response(struct client *client, void *buffer)
562 {
563         struct fw_cdev_send_response *request = buffer;
564         struct client_resource *resource;
565         struct request *r;
566
567         if (release_client_resource(client, request->handle, &resource) < 0)
568                 return -EINVAL;
569         r = container_of(resource, struct request, resource);
570         if (request->length < r->length)
571                 r->length = request->length;
572         if (copy_from_user(r->data, u64_to_uptr(request->data), r->length))
573                 return -EFAULT;
574
575         fw_send_response(client->device->card, r->request, request->rcode);
576         kfree(r);
577
578         return 0;
579 }
580
581 static int ioctl_initiate_bus_reset(struct client *client, void *buffer)
582 {
583         struct fw_cdev_initiate_bus_reset *request = buffer;
584         int short_reset;
585
586         short_reset = (request->type == FW_CDEV_SHORT_RESET);
587
588         return fw_core_initiate_bus_reset(client->device->card, short_reset);
589 }
590
591 struct descriptor {
592         struct fw_descriptor d;
593         struct client_resource resource;
594         u32 data[0];
595 };
596
597 static void release_descriptor(struct client *client,
598                                struct client_resource *resource)
599 {
600         struct descriptor *descriptor =
601                 container_of(resource, struct descriptor, resource);
602
603         fw_core_remove_descriptor(&descriptor->d);
604         kfree(descriptor);
605 }
606
607 static int ioctl_add_descriptor(struct client *client, void *buffer)
608 {
609         struct fw_cdev_add_descriptor *request = buffer;
610         struct descriptor *descriptor;
611         int retval;
612
613         if (request->length > 256)
614                 return -EINVAL;
615
616         descriptor =
617                 kmalloc(sizeof(*descriptor) + request->length * 4, GFP_KERNEL);
618         if (descriptor == NULL)
619                 return -ENOMEM;
620
621         if (copy_from_user(descriptor->data,
622                            u64_to_uptr(request->data), request->length * 4)) {
623                 kfree(descriptor);
624                 return -EFAULT;
625         }
626
627         descriptor->d.length = request->length;
628         descriptor->d.immediate = request->immediate;
629         descriptor->d.key = request->key;
630         descriptor->d.data = descriptor->data;
631
632         retval = fw_core_add_descriptor(&descriptor->d);
633         if (retval < 0) {
634                 kfree(descriptor);
635                 return retval;
636         }
637
638         descriptor->resource.release = release_descriptor;
639         add_client_resource(client, &descriptor->resource);
640         request->handle = descriptor->resource.handle;
641
642         return 0;
643 }
644
645 static int ioctl_remove_descriptor(struct client *client, void *buffer)
646 {
647         struct fw_cdev_remove_descriptor *request = buffer;
648
649         return release_client_resource(client, request->handle, NULL);
650 }
651
652 static void
653 iso_callback(struct fw_iso_context *context, u32 cycle,
654              size_t header_length, void *header, void *data)
655 {
656         struct client *client = data;
657         struct iso_interrupt *irq;
658
659         irq = kzalloc(sizeof(*irq) + header_length, GFP_ATOMIC);
660         if (irq == NULL)
661                 return;
662
663         irq->interrupt.type      = FW_CDEV_EVENT_ISO_INTERRUPT;
664         irq->interrupt.closure   = client->iso_closure;
665         irq->interrupt.cycle     = cycle;
666         irq->interrupt.header_length = header_length;
667         memcpy(irq->interrupt.header, header, header_length);
668         queue_event(client, &irq->event, &irq->interrupt,
669                     sizeof(irq->interrupt) + header_length, NULL, 0);
670 }
671
672 static int ioctl_create_iso_context(struct client *client, void *buffer)
673 {
674         struct fw_cdev_create_iso_context *request = buffer;
675         struct fw_iso_context *context;
676
677         /* We only support one context at this time. */
678         if (client->iso_context != NULL)
679                 return -EBUSY;
680
681         if (request->channel > 63)
682                 return -EINVAL;
683
684         switch (request->type) {
685         case FW_ISO_CONTEXT_RECEIVE:
686                 if (request->header_size < 4 || (request->header_size & 3))
687                         return -EINVAL;
688
689                 break;
690
691         case FW_ISO_CONTEXT_TRANSMIT:
692                 if (request->speed > SCODE_3200)
693                         return -EINVAL;
694
695                 break;
696
697         default:
698                 return -EINVAL;
699         }
700
701         context =  fw_iso_context_create(client->device->card,
702                                          request->type,
703                                          request->channel,
704                                          request->speed,
705                                          request->header_size,
706                                          iso_callback, client);
707         if (IS_ERR(context))
708                 return PTR_ERR(context);
709
710         client->iso_closure = request->closure;
711         client->iso_context = context;
712
713         /* We only support one context at this time. */
714         request->handle = 0;
715
716         return 0;
717 }
718
719 /* Macros for decoding the iso packet control header. */
720 #define GET_PAYLOAD_LENGTH(v)   ((v) & 0xffff)
721 #define GET_INTERRUPT(v)        (((v) >> 16) & 0x01)
722 #define GET_SKIP(v)             (((v) >> 17) & 0x01)
723 #define GET_TAG(v)              (((v) >> 18) & 0x03)
724 #define GET_SY(v)               (((v) >> 20) & 0x0f)
725 #define GET_HEADER_LENGTH(v)    (((v) >> 24) & 0xff)
726
727 static int ioctl_queue_iso(struct client *client, void *buffer)
728 {
729         struct fw_cdev_queue_iso *request = buffer;
730         struct fw_cdev_iso_packet __user *p, *end, *next;
731         struct fw_iso_context *ctx = client->iso_context;
732         unsigned long payload, buffer_end, header_length;
733         u32 control;
734         int count;
735         struct {
736                 struct fw_iso_packet packet;
737                 u8 header[256];
738         } u;
739
740         if (ctx == NULL || request->handle != 0)
741                 return -EINVAL;
742
743         /*
744          * If the user passes a non-NULL data pointer, has mmap()'ed
745          * the iso buffer, and the pointer points inside the buffer,
746          * we setup the payload pointers accordingly.  Otherwise we
747          * set them both to 0, which will still let packets with
748          * payload_length == 0 through.  In other words, if no packets
749          * use the indirect payload, the iso buffer need not be mapped
750          * and the request->data pointer is ignored.
751          */
752
753         payload = (unsigned long)request->data - client->vm_start;
754         buffer_end = client->buffer.page_count << PAGE_SHIFT;
755         if (request->data == 0 || client->buffer.pages == NULL ||
756             payload >= buffer_end) {
757                 payload = 0;
758                 buffer_end = 0;
759         }
760
761         p = (struct fw_cdev_iso_packet __user *)u64_to_uptr(request->packets);
762
763         if (!access_ok(VERIFY_READ, p, request->size))
764                 return -EFAULT;
765
766         end = (void __user *)p + request->size;
767         count = 0;
768         while (p < end) {
769                 if (get_user(control, &p->control))
770                         return -EFAULT;
771                 u.packet.payload_length = GET_PAYLOAD_LENGTH(control);
772                 u.packet.interrupt = GET_INTERRUPT(control);
773                 u.packet.skip = GET_SKIP(control);
774                 u.packet.tag = GET_TAG(control);
775                 u.packet.sy = GET_SY(control);
776                 u.packet.header_length = GET_HEADER_LENGTH(control);
777
778                 if (ctx->type == FW_ISO_CONTEXT_TRANSMIT) {
779                         header_length = u.packet.header_length;
780                 } else {
781                         /*
782                          * We require that header_length is a multiple of
783                          * the fixed header size, ctx->header_size.
784                          */
785                         if (ctx->header_size == 0) {
786                                 if (u.packet.header_length > 0)
787                                         return -EINVAL;
788                         } else if (u.packet.header_length % ctx->header_size != 0) {
789                                 return -EINVAL;
790                         }
791                         header_length = 0;
792                 }
793
794                 next = (struct fw_cdev_iso_packet __user *)
795                         &p->header[header_length / 4];
796                 if (next > end)
797                         return -EINVAL;
798                 if (__copy_from_user
799                     (u.packet.header, p->header, header_length))
800                         return -EFAULT;
801                 if (u.packet.skip && ctx->type == FW_ISO_CONTEXT_TRANSMIT &&
802                     u.packet.header_length + u.packet.payload_length > 0)
803                         return -EINVAL;
804                 if (payload + u.packet.payload_length > buffer_end)
805                         return -EINVAL;
806
807                 if (fw_iso_context_queue(ctx, &u.packet,
808                                          &client->buffer, payload))
809                         break;
810
811                 p = next;
812                 payload += u.packet.payload_length;
813                 count++;
814         }
815
816         request->size    -= uptr_to_u64(p) - request->packets;
817         request->packets  = uptr_to_u64(p);
818         request->data     = client->vm_start + payload;
819
820         return count;
821 }
822
823 static int ioctl_start_iso(struct client *client, void *buffer)
824 {
825         struct fw_cdev_start_iso *request = buffer;
826
827         if (client->iso_context == NULL || request->handle != 0)
828                 return -EINVAL;
829
830         if (client->iso_context->type == FW_ISO_CONTEXT_RECEIVE) {
831                 if (request->tags == 0 || request->tags > 15)
832                         return -EINVAL;
833
834                 if (request->sync > 15)
835                         return -EINVAL;
836         }
837
838         return fw_iso_context_start(client->iso_context, request->cycle,
839                                     request->sync, request->tags);
840 }
841
842 static int ioctl_stop_iso(struct client *client, void *buffer)
843 {
844         struct fw_cdev_stop_iso *request = buffer;
845
846         if (client->iso_context == NULL || request->handle != 0)
847                 return -EINVAL;
848
849         return fw_iso_context_stop(client->iso_context);
850 }
851
852 static int ioctl_get_cycle_timer(struct client *client, void *buffer)
853 {
854         struct fw_cdev_get_cycle_timer *request = buffer;
855         struct fw_card *card = client->device->card;
856         unsigned long long bus_time;
857         struct timeval tv;
858         unsigned long flags;
859
860         preempt_disable();
861         local_irq_save(flags);
862
863         bus_time = card->driver->get_bus_time(card);
864         do_gettimeofday(&tv);
865
866         local_irq_restore(flags);
867         preempt_enable();
868
869         request->local_time = tv.tv_sec * 1000000ULL + tv.tv_usec;
870         request->cycle_timer = bus_time & 0xffffffff;
871         return 0;
872 }
873
874 static int (* const ioctl_handlers[])(struct client *client, void *buffer) = {
875         ioctl_get_info,
876         ioctl_send_request,
877         ioctl_allocate,
878         ioctl_deallocate,
879         ioctl_send_response,
880         ioctl_initiate_bus_reset,
881         ioctl_add_descriptor,
882         ioctl_remove_descriptor,
883         ioctl_create_iso_context,
884         ioctl_queue_iso,
885         ioctl_start_iso,
886         ioctl_stop_iso,
887         ioctl_get_cycle_timer,
888 };
889
890 static int
891 dispatch_ioctl(struct client *client, unsigned int cmd, void __user *arg)
892 {
893         char buffer[256];
894         int retval;
895
896         if (_IOC_TYPE(cmd) != '#' ||
897             _IOC_NR(cmd) >= ARRAY_SIZE(ioctl_handlers))
898                 return -EINVAL;
899
900         if (_IOC_DIR(cmd) & _IOC_WRITE) {
901                 if (_IOC_SIZE(cmd) > sizeof(buffer) ||
902                     copy_from_user(buffer, arg, _IOC_SIZE(cmd)))
903                         return -EFAULT;
904         }
905
906         retval = ioctl_handlers[_IOC_NR(cmd)](client, buffer);
907         if (retval < 0)
908                 return retval;
909
910         if (_IOC_DIR(cmd) & _IOC_READ) {
911                 if (_IOC_SIZE(cmd) > sizeof(buffer) ||
912                     copy_to_user(arg, buffer, _IOC_SIZE(cmd)))
913                         return -EFAULT;
914         }
915
916         return retval;
917 }
918
919 static long
920 fw_device_op_ioctl(struct file *file,
921                    unsigned int cmd, unsigned long arg)
922 {
923         struct client *client = file->private_data;
924
925         if (fw_device_is_shutdown(client->device))
926                 return -ENODEV;
927
928         return dispatch_ioctl(client, cmd, (void __user *) arg);
929 }
930
931 #ifdef CONFIG_COMPAT
932 static long
933 fw_device_op_compat_ioctl(struct file *file,
934                           unsigned int cmd, unsigned long arg)
935 {
936         struct client *client = file->private_data;
937
938         if (fw_device_is_shutdown(client->device))
939                 return -ENODEV;
940
941         return dispatch_ioctl(client, cmd, compat_ptr(arg));
942 }
943 #endif
944
945 static int fw_device_op_mmap(struct file *file, struct vm_area_struct *vma)
946 {
947         struct client *client = file->private_data;
948         enum dma_data_direction direction;
949         unsigned long size;
950         int page_count, retval;
951
952         if (fw_device_is_shutdown(client->device))
953                 return -ENODEV;
954
955         /* FIXME: We could support multiple buffers, but we don't. */
956         if (client->buffer.pages != NULL)
957                 return -EBUSY;
958
959         if (!(vma->vm_flags & VM_SHARED))
960                 return -EINVAL;
961
962         if (vma->vm_start & ~PAGE_MASK)
963                 return -EINVAL;
964
965         client->vm_start = vma->vm_start;
966         size = vma->vm_end - vma->vm_start;
967         page_count = size >> PAGE_SHIFT;
968         if (size & ~PAGE_MASK)
969                 return -EINVAL;
970
971         if (vma->vm_flags & VM_WRITE)
972                 direction = DMA_TO_DEVICE;
973         else
974                 direction = DMA_FROM_DEVICE;
975
976         retval = fw_iso_buffer_init(&client->buffer, client->device->card,
977                                     page_count, direction);
978         if (retval < 0)
979                 return retval;
980
981         retval = fw_iso_buffer_map(&client->buffer, vma);
982         if (retval < 0)
983                 fw_iso_buffer_destroy(&client->buffer, client->device->card);
984
985         return retval;
986 }
987
988 static int fw_device_op_release(struct inode *inode, struct file *file)
989 {
990         struct client *client = file->private_data;
991         struct event *e, *next_e;
992         struct client_resource *r, *next_r;
993         unsigned long flags;
994
995         if (client->buffer.pages)
996                 fw_iso_buffer_destroy(&client->buffer, client->device->card);
997
998         if (client->iso_context)
999                 fw_iso_context_destroy(client->iso_context);
1000
1001         list_for_each_entry_safe(r, next_r, &client->resource_list, link)
1002                 r->release(client, r);
1003
1004         /*
1005          * FIXME: We should wait for the async tasklets to stop
1006          * running before freeing the memory.
1007          */
1008
1009         list_for_each_entry_safe(e, next_e, &client->event_list, link)
1010                 kfree(e);
1011
1012         spin_lock_irqsave(&client->device->card->lock, flags);
1013         list_del(&client->link);
1014         spin_unlock_irqrestore(&client->device->card->lock, flags);
1015
1016         fw_device_put(client->device);
1017         kfree(client);
1018
1019         return 0;
1020 }
1021
1022 static unsigned int fw_device_op_poll(struct file *file, poll_table * pt)
1023 {
1024         struct client *client = file->private_data;
1025         unsigned int mask = 0;
1026
1027         poll_wait(file, &client->wait, pt);
1028
1029         if (fw_device_is_shutdown(client->device))
1030                 mask |= POLLHUP | POLLERR;
1031         if (!list_empty(&client->event_list))
1032                 mask |= POLLIN | POLLRDNORM;
1033
1034         return mask;
1035 }
1036
1037 const struct file_operations fw_device_ops = {
1038         .owner          = THIS_MODULE,
1039         .open           = fw_device_op_open,
1040         .read           = fw_device_op_read,
1041         .unlocked_ioctl = fw_device_op_ioctl,
1042         .poll           = fw_device_op_poll,
1043         .release        = fw_device_op_release,
1044         .mmap           = fw_device_op_mmap,
1045
1046 #ifdef CONFIG_COMPAT
1047         .compat_ioctl   = fw_device_op_compat_ioctl,
1048 #endif
1049 };