Merge branch 'hotfixes' of git://git.linux-nfs.org/projects/trondmy/nfs-2.6
[pandora-kernel.git] / 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         client = kzalloc(sizeof(*client), GFP_KERNEL);
117         if (client == NULL) {
118                 fw_device_put(device);
119                 return -ENOMEM;
120         }
121
122         client->device = device;
123         INIT_LIST_HEAD(&client->event_list);
124         INIT_LIST_HEAD(&client->resource_list);
125         spin_lock_init(&client->lock);
126         init_waitqueue_head(&client->wait);
127
128         file->private_data = client;
129
130         spin_lock_irqsave(&device->card->lock, flags);
131         list_add_tail(&client->link, &device->client_list);
132         spin_unlock_irqrestore(&device->card->lock, flags);
133
134         return 0;
135 }
136
137 static void queue_event(struct client *client, struct event *event,
138                         void *data0, size_t size0, void *data1, size_t size1)
139 {
140         unsigned long flags;
141
142         event->v[0].data = data0;
143         event->v[0].size = size0;
144         event->v[1].data = data1;
145         event->v[1].size = size1;
146
147         spin_lock_irqsave(&client->lock, flags);
148         list_add_tail(&event->link, &client->event_list);
149         spin_unlock_irqrestore(&client->lock, flags);
150
151         wake_up_interruptible(&client->wait);
152 }
153
154 static int
155 dequeue_event(struct client *client, char __user *buffer, size_t count)
156 {
157         unsigned long flags;
158         struct event *event;
159         size_t size, total;
160         int i, retval;
161
162         retval = wait_event_interruptible(client->wait,
163                                           !list_empty(&client->event_list) ||
164                                           fw_device_is_shutdown(client->device));
165         if (retval < 0)
166                 return retval;
167
168         if (list_empty(&client->event_list) &&
169                        fw_device_is_shutdown(client->device))
170                 return -ENODEV;
171
172         spin_lock_irqsave(&client->lock, flags);
173         event = container_of(client->event_list.next, struct event, link);
174         list_del(&event->link);
175         spin_unlock_irqrestore(&client->lock, flags);
176
177         total = 0;
178         for (i = 0; i < ARRAY_SIZE(event->v) && total < count; i++) {
179                 size = min(event->v[i].size, count - total);
180                 if (copy_to_user(buffer + total, event->v[i].data, size)) {
181                         retval = -EFAULT;
182                         goto out;
183                 }
184                 total += size;
185         }
186         retval = total;
187
188  out:
189         kfree(event);
190
191         return retval;
192 }
193
194 static ssize_t
195 fw_device_op_read(struct file *file,
196                   char __user *buffer, size_t count, loff_t *offset)
197 {
198         struct client *client = file->private_data;
199
200         return dequeue_event(client, buffer, count);
201 }
202
203 static void
204 fill_bus_reset_event(struct fw_cdev_event_bus_reset *event,
205                      struct client *client)
206 {
207         struct fw_card *card = client->device->card;
208
209         event->closure       = client->bus_reset_closure;
210         event->type          = FW_CDEV_EVENT_BUS_RESET;
211         event->generation    = client->device->generation;
212         smp_rmb();           /* node_id must not be older than generation */
213         event->node_id       = client->device->node_id;
214         event->local_node_id = card->local_node->node_id;
215         event->bm_node_id    = 0; /* FIXME: We don't track the BM. */
216         event->irm_node_id   = card->irm_node->node_id;
217         event->root_node_id  = card->root_node->node_id;
218 }
219
220 static void
221 for_each_client(struct fw_device *device,
222                 void (*callback)(struct client *client))
223 {
224         struct fw_card *card = device->card;
225         struct client *c;
226         unsigned long flags;
227
228         spin_lock_irqsave(&card->lock, flags);
229
230         list_for_each_entry(c, &device->client_list, link)
231                 callback(c);
232
233         spin_unlock_irqrestore(&card->lock, flags);
234 }
235
236 static void
237 queue_bus_reset_event(struct client *client)
238 {
239         struct bus_reset *bus_reset;
240
241         bus_reset = kzalloc(sizeof(*bus_reset), GFP_ATOMIC);
242         if (bus_reset == NULL) {
243                 fw_notify("Out of memory when allocating bus reset event\n");
244                 return;
245         }
246
247         fill_bus_reset_event(&bus_reset->reset, client);
248
249         queue_event(client, &bus_reset->event,
250                     &bus_reset->reset, sizeof(bus_reset->reset), NULL, 0);
251 }
252
253 void fw_device_cdev_update(struct fw_device *device)
254 {
255         for_each_client(device, queue_bus_reset_event);
256 }
257
258 static void wake_up_client(struct client *client)
259 {
260         wake_up_interruptible(&client->wait);
261 }
262
263 void fw_device_cdev_remove(struct fw_device *device)
264 {
265         for_each_client(device, wake_up_client);
266 }
267
268 static int ioctl_get_info(struct client *client, void *buffer)
269 {
270         struct fw_cdev_get_info *get_info = buffer;
271         struct fw_cdev_event_bus_reset bus_reset;
272
273         client->version = get_info->version;
274         get_info->version = FW_CDEV_VERSION;
275
276         if (get_info->rom != 0) {
277                 void __user *uptr = u64_to_uptr(get_info->rom);
278                 size_t want = get_info->rom_length;
279                 size_t have = client->device->config_rom_length * 4;
280
281                 if (copy_to_user(uptr, client->device->config_rom,
282                                  min(want, have)))
283                         return -EFAULT;
284         }
285         get_info->rom_length = client->device->config_rom_length * 4;
286
287         client->bus_reset_closure = get_info->bus_reset_closure;
288         if (get_info->bus_reset != 0) {
289                 void __user *uptr = u64_to_uptr(get_info->bus_reset);
290
291                 fill_bus_reset_event(&bus_reset, client);
292                 if (copy_to_user(uptr, &bus_reset, sizeof(bus_reset)))
293                         return -EFAULT;
294         }
295
296         get_info->card = client->device->card->index;
297
298         return 0;
299 }
300
301 static void
302 add_client_resource(struct client *client, struct client_resource *resource)
303 {
304         unsigned long flags;
305
306         spin_lock_irqsave(&client->lock, flags);
307         list_add_tail(&resource->link, &client->resource_list);
308         resource->handle = client->resource_handle++;
309         spin_unlock_irqrestore(&client->lock, flags);
310 }
311
312 static int
313 release_client_resource(struct client *client, u32 handle,
314                         struct client_resource **resource)
315 {
316         struct client_resource *r;
317         unsigned long flags;
318
319         spin_lock_irqsave(&client->lock, flags);
320         list_for_each_entry(r, &client->resource_list, link) {
321                 if (r->handle == handle) {
322                         list_del(&r->link);
323                         break;
324                 }
325         }
326         spin_unlock_irqrestore(&client->lock, flags);
327
328         if (&r->link == &client->resource_list)
329                 return -EINVAL;
330
331         if (resource)
332                 *resource = r;
333         else
334                 r->release(client, r);
335
336         return 0;
337 }
338
339 static void
340 release_transaction(struct client *client, struct client_resource *resource)
341 {
342         struct response *response =
343                 container_of(resource, struct response, resource);
344
345         fw_cancel_transaction(client->device->card, &response->transaction);
346 }
347
348 static void
349 complete_transaction(struct fw_card *card, int rcode,
350                      void *payload, size_t length, void *data)
351 {
352         struct response *response = data;
353         struct client *client = response->client;
354         unsigned long flags;
355
356         if (length < response->response.length)
357                 response->response.length = length;
358         if (rcode == RCODE_COMPLETE)
359                 memcpy(response->response.data, payload,
360                        response->response.length);
361
362         spin_lock_irqsave(&client->lock, flags);
363         list_del(&response->resource.link);
364         spin_unlock_irqrestore(&client->lock, flags);
365
366         response->response.type   = FW_CDEV_EVENT_RESPONSE;
367         response->response.rcode  = rcode;
368         queue_event(client, &response->event,
369                     &response->response, sizeof(response->response),
370                     response->response.data, response->response.length);
371 }
372
373 static int ioctl_send_request(struct client *client, void *buffer)
374 {
375         struct fw_device *device = client->device;
376         struct fw_cdev_send_request *request = buffer;
377         struct response *response;
378
379         /* What is the biggest size we'll accept, really? */
380         if (request->length > 4096)
381                 return -EINVAL;
382
383         response = kmalloc(sizeof(*response) + request->length, GFP_KERNEL);
384         if (response == NULL)
385                 return -ENOMEM;
386
387         response->client = client;
388         response->response.length = request->length;
389         response->response.closure = request->closure;
390
391         if (request->data &&
392             copy_from_user(response->response.data,
393                            u64_to_uptr(request->data), request->length)) {
394                 kfree(response);
395                 return -EFAULT;
396         }
397
398         response->resource.release = release_transaction;
399         add_client_resource(client, &response->resource);
400
401         fw_send_request(device->card, &response->transaction,
402                         request->tcode & 0x1f,
403                         device->node->node_id,
404                         request->generation,
405                         device->max_speed,
406                         request->offset,
407                         response->response.data, request->length,
408                         complete_transaction, response);
409
410         if (request->data)
411                 return sizeof(request) + request->length;
412         else
413                 return sizeof(request);
414 }
415
416 struct address_handler {
417         struct fw_address_handler handler;
418         __u64 closure;
419         struct client *client;
420         struct client_resource resource;
421 };
422
423 struct request {
424         struct fw_request *request;
425         void *data;
426         size_t length;
427         struct client_resource resource;
428 };
429
430 struct request_event {
431         struct event event;
432         struct fw_cdev_event_request request;
433 };
434
435 static void
436 release_request(struct client *client, struct client_resource *resource)
437 {
438         struct request *request =
439                 container_of(resource, struct request, resource);
440
441         fw_send_response(client->device->card, request->request,
442                          RCODE_CONFLICT_ERROR);
443         kfree(request);
444 }
445
446 static void
447 handle_request(struct fw_card *card, struct fw_request *r,
448                int tcode, int destination, int source,
449                int generation, int speed,
450                unsigned long long offset,
451                void *payload, size_t length, void *callback_data)
452 {
453         struct address_handler *handler = callback_data;
454         struct request *request;
455         struct request_event *e;
456         struct client *client = handler->client;
457
458         request = kmalloc(sizeof(*request), GFP_ATOMIC);
459         e = kmalloc(sizeof(*e), GFP_ATOMIC);
460         if (request == NULL || e == NULL) {
461                 kfree(request);
462                 kfree(e);
463                 fw_send_response(card, r, RCODE_CONFLICT_ERROR);
464                 return;
465         }
466
467         request->request = r;
468         request->data    = payload;
469         request->length  = length;
470
471         request->resource.release = release_request;
472         add_client_resource(client, &request->resource);
473
474         e->request.type    = FW_CDEV_EVENT_REQUEST;
475         e->request.tcode   = tcode;
476         e->request.offset  = offset;
477         e->request.length  = length;
478         e->request.handle  = request->resource.handle;
479         e->request.closure = handler->closure;
480
481         queue_event(client, &e->event,
482                     &e->request, sizeof(e->request), payload, length);
483 }
484
485 static void
486 release_address_handler(struct client *client,
487                         struct client_resource *resource)
488 {
489         struct address_handler *handler =
490                 container_of(resource, struct address_handler, resource);
491
492         fw_core_remove_address_handler(&handler->handler);
493         kfree(handler);
494 }
495
496 static int ioctl_allocate(struct client *client, void *buffer)
497 {
498         struct fw_cdev_allocate *request = buffer;
499         struct address_handler *handler;
500         struct fw_address_region region;
501
502         handler = kmalloc(sizeof(*handler), GFP_KERNEL);
503         if (handler == NULL)
504                 return -ENOMEM;
505
506         region.start = request->offset;
507         region.end = request->offset + request->length;
508         handler->handler.length = request->length;
509         handler->handler.address_callback = handle_request;
510         handler->handler.callback_data = handler;
511         handler->closure = request->closure;
512         handler->client = client;
513
514         if (fw_core_add_address_handler(&handler->handler, &region) < 0) {
515                 kfree(handler);
516                 return -EBUSY;
517         }
518
519         handler->resource.release = release_address_handler;
520         add_client_resource(client, &handler->resource);
521         request->handle = handler->resource.handle;
522
523         return 0;
524 }
525
526 static int ioctl_deallocate(struct client *client, void *buffer)
527 {
528         struct fw_cdev_deallocate *request = buffer;
529
530         return release_client_resource(client, request->handle, NULL);
531 }
532
533 static int ioctl_send_response(struct client *client, void *buffer)
534 {
535         struct fw_cdev_send_response *request = buffer;
536         struct client_resource *resource;
537         struct request *r;
538
539         if (release_client_resource(client, request->handle, &resource) < 0)
540                 return -EINVAL;
541         r = container_of(resource, struct request, resource);
542         if (request->length < r->length)
543                 r->length = request->length;
544         if (copy_from_user(r->data, u64_to_uptr(request->data), r->length))
545                 return -EFAULT;
546
547         fw_send_response(client->device->card, r->request, request->rcode);
548         kfree(r);
549
550         return 0;
551 }
552
553 static int ioctl_initiate_bus_reset(struct client *client, void *buffer)
554 {
555         struct fw_cdev_initiate_bus_reset *request = buffer;
556         int short_reset;
557
558         short_reset = (request->type == FW_CDEV_SHORT_RESET);
559
560         return fw_core_initiate_bus_reset(client->device->card, short_reset);
561 }
562
563 struct descriptor {
564         struct fw_descriptor d;
565         struct client_resource resource;
566         u32 data[0];
567 };
568
569 static void release_descriptor(struct client *client,
570                                struct client_resource *resource)
571 {
572         struct descriptor *descriptor =
573                 container_of(resource, struct descriptor, resource);
574
575         fw_core_remove_descriptor(&descriptor->d);
576         kfree(descriptor);
577 }
578
579 static int ioctl_add_descriptor(struct client *client, void *buffer)
580 {
581         struct fw_cdev_add_descriptor *request = buffer;
582         struct descriptor *descriptor;
583         int retval;
584
585         if (request->length > 256)
586                 return -EINVAL;
587
588         descriptor =
589                 kmalloc(sizeof(*descriptor) + request->length * 4, GFP_KERNEL);
590         if (descriptor == NULL)
591                 return -ENOMEM;
592
593         if (copy_from_user(descriptor->data,
594                            u64_to_uptr(request->data), request->length * 4)) {
595                 kfree(descriptor);
596                 return -EFAULT;
597         }
598
599         descriptor->d.length = request->length;
600         descriptor->d.immediate = request->immediate;
601         descriptor->d.key = request->key;
602         descriptor->d.data = descriptor->data;
603
604         retval = fw_core_add_descriptor(&descriptor->d);
605         if (retval < 0) {
606                 kfree(descriptor);
607                 return retval;
608         }
609
610         descriptor->resource.release = release_descriptor;
611         add_client_resource(client, &descriptor->resource);
612         request->handle = descriptor->resource.handle;
613
614         return 0;
615 }
616
617 static int ioctl_remove_descriptor(struct client *client, void *buffer)
618 {
619         struct fw_cdev_remove_descriptor *request = buffer;
620
621         return release_client_resource(client, request->handle, NULL);
622 }
623
624 static void
625 iso_callback(struct fw_iso_context *context, u32 cycle,
626              size_t header_length, void *header, void *data)
627 {
628         struct client *client = data;
629         struct iso_interrupt *irq;
630
631         irq = kzalloc(sizeof(*irq) + header_length, GFP_ATOMIC);
632         if (irq == NULL)
633                 return;
634
635         irq->interrupt.type      = FW_CDEV_EVENT_ISO_INTERRUPT;
636         irq->interrupt.closure   = client->iso_closure;
637         irq->interrupt.cycle     = cycle;
638         irq->interrupt.header_length = header_length;
639         memcpy(irq->interrupt.header, header, header_length);
640         queue_event(client, &irq->event, &irq->interrupt,
641                     sizeof(irq->interrupt) + header_length, NULL, 0);
642 }
643
644 static int ioctl_create_iso_context(struct client *client, void *buffer)
645 {
646         struct fw_cdev_create_iso_context *request = buffer;
647         struct fw_iso_context *context;
648
649         /* We only support one context at this time. */
650         if (client->iso_context != NULL)
651                 return -EBUSY;
652
653         if (request->channel > 63)
654                 return -EINVAL;
655
656         switch (request->type) {
657         case FW_ISO_CONTEXT_RECEIVE:
658                 if (request->header_size < 4 || (request->header_size & 3))
659                         return -EINVAL;
660
661                 break;
662
663         case FW_ISO_CONTEXT_TRANSMIT:
664                 if (request->speed > SCODE_3200)
665                         return -EINVAL;
666
667                 break;
668
669         default:
670                 return -EINVAL;
671         }
672
673         context =  fw_iso_context_create(client->device->card,
674                                          request->type,
675                                          request->channel,
676                                          request->speed,
677                                          request->header_size,
678                                          iso_callback, client);
679         if (IS_ERR(context))
680                 return PTR_ERR(context);
681
682         client->iso_closure = request->closure;
683         client->iso_context = context;
684
685         /* We only support one context at this time. */
686         request->handle = 0;
687
688         return 0;
689 }
690
691 /* Macros for decoding the iso packet control header. */
692 #define GET_PAYLOAD_LENGTH(v)   ((v) & 0xffff)
693 #define GET_INTERRUPT(v)        (((v) >> 16) & 0x01)
694 #define GET_SKIP(v)             (((v) >> 17) & 0x01)
695 #define GET_TAG(v)              (((v) >> 18) & 0x02)
696 #define GET_SY(v)               (((v) >> 20) & 0x04)
697 #define GET_HEADER_LENGTH(v)    (((v) >> 24) & 0xff)
698
699 static int ioctl_queue_iso(struct client *client, void *buffer)
700 {
701         struct fw_cdev_queue_iso *request = buffer;
702         struct fw_cdev_iso_packet __user *p, *end, *next;
703         struct fw_iso_context *ctx = client->iso_context;
704         unsigned long payload, buffer_end, header_length;
705         u32 control;
706         int count;
707         struct {
708                 struct fw_iso_packet packet;
709                 u8 header[256];
710         } u;
711
712         if (ctx == NULL || request->handle != 0)
713                 return -EINVAL;
714
715         /*
716          * If the user passes a non-NULL data pointer, has mmap()'ed
717          * the iso buffer, and the pointer points inside the buffer,
718          * we setup the payload pointers accordingly.  Otherwise we
719          * set them both to 0, which will still let packets with
720          * payload_length == 0 through.  In other words, if no packets
721          * use the indirect payload, the iso buffer need not be mapped
722          * and the request->data pointer is ignored.
723          */
724
725         payload = (unsigned long)request->data - client->vm_start;
726         buffer_end = client->buffer.page_count << PAGE_SHIFT;
727         if (request->data == 0 || client->buffer.pages == NULL ||
728             payload >= buffer_end) {
729                 payload = 0;
730                 buffer_end = 0;
731         }
732
733         p = (struct fw_cdev_iso_packet __user *)u64_to_uptr(request->packets);
734
735         if (!access_ok(VERIFY_READ, p, request->size))
736                 return -EFAULT;
737
738         end = (void __user *)p + request->size;
739         count = 0;
740         while (p < end) {
741                 if (get_user(control, &p->control))
742                         return -EFAULT;
743                 u.packet.payload_length = GET_PAYLOAD_LENGTH(control);
744                 u.packet.interrupt = GET_INTERRUPT(control);
745                 u.packet.skip = GET_SKIP(control);
746                 u.packet.tag = GET_TAG(control);
747                 u.packet.sy = GET_SY(control);
748                 u.packet.header_length = GET_HEADER_LENGTH(control);
749
750                 if (ctx->type == FW_ISO_CONTEXT_TRANSMIT) {
751                         header_length = u.packet.header_length;
752                 } else {
753                         /*
754                          * We require that header_length is a multiple of
755                          * the fixed header size, ctx->header_size.
756                          */
757                         if (ctx->header_size == 0) {
758                                 if (u.packet.header_length > 0)
759                                         return -EINVAL;
760                         } else if (u.packet.header_length % ctx->header_size != 0) {
761                                 return -EINVAL;
762                         }
763                         header_length = 0;
764                 }
765
766                 next = (struct fw_cdev_iso_packet __user *)
767                         &p->header[header_length / 4];
768                 if (next > end)
769                         return -EINVAL;
770                 if (__copy_from_user
771                     (u.packet.header, p->header, header_length))
772                         return -EFAULT;
773                 if (u.packet.skip && ctx->type == FW_ISO_CONTEXT_TRANSMIT &&
774                     u.packet.header_length + u.packet.payload_length > 0)
775                         return -EINVAL;
776                 if (payload + u.packet.payload_length > buffer_end)
777                         return -EINVAL;
778
779                 if (fw_iso_context_queue(ctx, &u.packet,
780                                          &client->buffer, payload))
781                         break;
782
783                 p = next;
784                 payload += u.packet.payload_length;
785                 count++;
786         }
787
788         request->size    -= uptr_to_u64(p) - request->packets;
789         request->packets  = uptr_to_u64(p);
790         request->data     = client->vm_start + payload;
791
792         return count;
793 }
794
795 static int ioctl_start_iso(struct client *client, void *buffer)
796 {
797         struct fw_cdev_start_iso *request = buffer;
798
799         if (client->iso_context == NULL || request->handle != 0)
800                 return -EINVAL;
801
802         if (client->iso_context->type == FW_ISO_CONTEXT_RECEIVE) {
803                 if (request->tags == 0 || request->tags > 15)
804                         return -EINVAL;
805
806                 if (request->sync > 15)
807                         return -EINVAL;
808         }
809
810         return fw_iso_context_start(client->iso_context, request->cycle,
811                                     request->sync, request->tags);
812 }
813
814 static int ioctl_stop_iso(struct client *client, void *buffer)
815 {
816         struct fw_cdev_stop_iso *request = buffer;
817
818         if (client->iso_context == NULL || request->handle != 0)
819                 return -EINVAL;
820
821         return fw_iso_context_stop(client->iso_context);
822 }
823
824 static int ioctl_get_cycle_timer(struct client *client, void *buffer)
825 {
826         struct fw_cdev_get_cycle_timer *request = buffer;
827         struct fw_card *card = client->device->card;
828         unsigned long long bus_time;
829         struct timeval tv;
830         unsigned long flags;
831
832         preempt_disable();
833         local_irq_save(flags);
834
835         bus_time = card->driver->get_bus_time(card);
836         do_gettimeofday(&tv);
837
838         local_irq_restore(flags);
839         preempt_enable();
840
841         request->local_time = tv.tv_sec * 1000000ULL + tv.tv_usec;
842         request->cycle_timer = bus_time & 0xffffffff;
843         return 0;
844 }
845
846 static int (* const ioctl_handlers[])(struct client *client, void *buffer) = {
847         ioctl_get_info,
848         ioctl_send_request,
849         ioctl_allocate,
850         ioctl_deallocate,
851         ioctl_send_response,
852         ioctl_initiate_bus_reset,
853         ioctl_add_descriptor,
854         ioctl_remove_descriptor,
855         ioctl_create_iso_context,
856         ioctl_queue_iso,
857         ioctl_start_iso,
858         ioctl_stop_iso,
859         ioctl_get_cycle_timer,
860 };
861
862 static int
863 dispatch_ioctl(struct client *client, unsigned int cmd, void __user *arg)
864 {
865         char buffer[256];
866         int retval;
867
868         if (_IOC_TYPE(cmd) != '#' ||
869             _IOC_NR(cmd) >= ARRAY_SIZE(ioctl_handlers))
870                 return -EINVAL;
871
872         if (_IOC_DIR(cmd) & _IOC_WRITE) {
873                 if (_IOC_SIZE(cmd) > sizeof(buffer) ||
874                     copy_from_user(buffer, arg, _IOC_SIZE(cmd)))
875                         return -EFAULT;
876         }
877
878         retval = ioctl_handlers[_IOC_NR(cmd)](client, buffer);
879         if (retval < 0)
880                 return retval;
881
882         if (_IOC_DIR(cmd) & _IOC_READ) {
883                 if (_IOC_SIZE(cmd) > sizeof(buffer) ||
884                     copy_to_user(arg, buffer, _IOC_SIZE(cmd)))
885                         return -EFAULT;
886         }
887
888         return 0;
889 }
890
891 static long
892 fw_device_op_ioctl(struct file *file,
893                    unsigned int cmd, unsigned long arg)
894 {
895         struct client *client = file->private_data;
896
897         return dispatch_ioctl(client, cmd, (void __user *) arg);
898 }
899
900 #ifdef CONFIG_COMPAT
901 static long
902 fw_device_op_compat_ioctl(struct file *file,
903                           unsigned int cmd, unsigned long arg)
904 {
905         struct client *client = file->private_data;
906
907         return dispatch_ioctl(client, cmd, compat_ptr(arg));
908 }
909 #endif
910
911 static int fw_device_op_mmap(struct file *file, struct vm_area_struct *vma)
912 {
913         struct client *client = file->private_data;
914         enum dma_data_direction direction;
915         unsigned long size;
916         int page_count, retval;
917
918         /* FIXME: We could support multiple buffers, but we don't. */
919         if (client->buffer.pages != NULL)
920                 return -EBUSY;
921
922         if (!(vma->vm_flags & VM_SHARED))
923                 return -EINVAL;
924
925         if (vma->vm_start & ~PAGE_MASK)
926                 return -EINVAL;
927
928         client->vm_start = vma->vm_start;
929         size = vma->vm_end - vma->vm_start;
930         page_count = size >> PAGE_SHIFT;
931         if (size & ~PAGE_MASK)
932                 return -EINVAL;
933
934         if (vma->vm_flags & VM_WRITE)
935                 direction = DMA_TO_DEVICE;
936         else
937                 direction = DMA_FROM_DEVICE;
938
939         retval = fw_iso_buffer_init(&client->buffer, client->device->card,
940                                     page_count, direction);
941         if (retval < 0)
942                 return retval;
943
944         retval = fw_iso_buffer_map(&client->buffer, vma);
945         if (retval < 0)
946                 fw_iso_buffer_destroy(&client->buffer, client->device->card);
947
948         return retval;
949 }
950
951 static int fw_device_op_release(struct inode *inode, struct file *file)
952 {
953         struct client *client = file->private_data;
954         struct event *e, *next_e;
955         struct client_resource *r, *next_r;
956         unsigned long flags;
957
958         if (client->buffer.pages)
959                 fw_iso_buffer_destroy(&client->buffer, client->device->card);
960
961         if (client->iso_context)
962                 fw_iso_context_destroy(client->iso_context);
963
964         list_for_each_entry_safe(r, next_r, &client->resource_list, link)
965                 r->release(client, r);
966
967         /*
968          * FIXME: We should wait for the async tasklets to stop
969          * running before freeing the memory.
970          */
971
972         list_for_each_entry_safe(e, next_e, &client->event_list, link)
973                 kfree(e);
974
975         spin_lock_irqsave(&client->device->card->lock, flags);
976         list_del(&client->link);
977         spin_unlock_irqrestore(&client->device->card->lock, flags);
978
979         fw_device_put(client->device);
980         kfree(client);
981
982         return 0;
983 }
984
985 static unsigned int fw_device_op_poll(struct file *file, poll_table * pt)
986 {
987         struct client *client = file->private_data;
988         unsigned int mask = 0;
989
990         poll_wait(file, &client->wait, pt);
991
992         if (fw_device_is_shutdown(client->device))
993                 mask |= POLLHUP | POLLERR;
994         if (!list_empty(&client->event_list))
995                 mask |= POLLIN | POLLRDNORM;
996
997         return mask;
998 }
999
1000 const struct file_operations fw_device_ops = {
1001         .owner          = THIS_MODULE,
1002         .open           = fw_device_op_open,
1003         .read           = fw_device_op_read,
1004         .unlocked_ioctl = fw_device_op_ioctl,
1005         .poll           = fw_device_op_poll,
1006         .release        = fw_device_op_release,
1007         .mmap           = fw_device_op_mmap,
1008
1009 #ifdef CONFIG_COMPAT
1010         .compat_ioctl   = fw_device_op_compat_ioctl,
1011 #endif
1012 };