Merge branch 'virtex-for-2.6.25' of git://git.secretlab.ca/git/linux-2.6-virtex into...
[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_from_devt(inode->i_rdev);
113         if (device == NULL)
114                 return -ENODEV;
115
116         client = kzalloc(sizeof(*client), GFP_KERNEL);
117         if (client == NULL)
118                 return -ENOMEM;
119
120         client->device = fw_device_get(device);
121         INIT_LIST_HEAD(&client->event_list);
122         INIT_LIST_HEAD(&client->resource_list);
123         spin_lock_init(&client->lock);
124         init_waitqueue_head(&client->wait);
125
126         file->private_data = client;
127
128         spin_lock_irqsave(&device->card->lock, flags);
129         list_add_tail(&client->link, &device->client_list);
130         spin_unlock_irqrestore(&device->card->lock, flags);
131
132         return 0;
133 }
134
135 static void queue_event(struct client *client, struct event *event,
136                         void *data0, size_t size0, void *data1, size_t size1)
137 {
138         unsigned long flags;
139
140         event->v[0].data = data0;
141         event->v[0].size = size0;
142         event->v[1].data = data1;
143         event->v[1].size = size1;
144
145         spin_lock_irqsave(&client->lock, flags);
146         list_add_tail(&event->link, &client->event_list);
147         spin_unlock_irqrestore(&client->lock, flags);
148
149         wake_up_interruptible(&client->wait);
150 }
151
152 static int
153 dequeue_event(struct client *client, char __user *buffer, size_t count)
154 {
155         unsigned long flags;
156         struct event *event;
157         size_t size, total;
158         int i, retval;
159
160         retval = wait_event_interruptible(client->wait,
161                                           !list_empty(&client->event_list) ||
162                                           fw_device_is_shutdown(client->device));
163         if (retval < 0)
164                 return retval;
165
166         if (list_empty(&client->event_list) &&
167                        fw_device_is_shutdown(client->device))
168                 return -ENODEV;
169
170         spin_lock_irqsave(&client->lock, flags);
171         event = container_of(client->event_list.next, struct event, link);
172         list_del(&event->link);
173         spin_unlock_irqrestore(&client->lock, flags);
174
175         total = 0;
176         for (i = 0; i < ARRAY_SIZE(event->v) && total < count; i++) {
177                 size = min(event->v[i].size, count - total);
178                 if (copy_to_user(buffer + total, event->v[i].data, size)) {
179                         retval = -EFAULT;
180                         goto out;
181                 }
182                 total += size;
183         }
184         retval = total;
185
186  out:
187         kfree(event);
188
189         return retval;
190 }
191
192 static ssize_t
193 fw_device_op_read(struct file *file,
194                   char __user *buffer, size_t count, loff_t *offset)
195 {
196         struct client *client = file->private_data;
197
198         return dequeue_event(client, buffer, count);
199 }
200
201 static void
202 fill_bus_reset_event(struct fw_cdev_event_bus_reset *event,
203                      struct client *client)
204 {
205         struct fw_card *card = client->device->card;
206
207         event->closure       = client->bus_reset_closure;
208         event->type          = FW_CDEV_EVENT_BUS_RESET;
209         event->generation    = client->device->generation;
210         smp_rmb();           /* node_id must not be older than generation */
211         event->node_id       = client->device->node_id;
212         event->local_node_id = card->local_node->node_id;
213         event->bm_node_id    = 0; /* FIXME: We don't track the BM. */
214         event->irm_node_id   = card->irm_node->node_id;
215         event->root_node_id  = card->root_node->node_id;
216 }
217
218 static void
219 for_each_client(struct fw_device *device,
220                 void (*callback)(struct client *client))
221 {
222         struct fw_card *card = device->card;
223         struct client *c;
224         unsigned long flags;
225
226         spin_lock_irqsave(&card->lock, flags);
227
228         list_for_each_entry(c, &device->client_list, link)
229                 callback(c);
230
231         spin_unlock_irqrestore(&card->lock, flags);
232 }
233
234 static void
235 queue_bus_reset_event(struct client *client)
236 {
237         struct bus_reset *bus_reset;
238
239         bus_reset = kzalloc(sizeof(*bus_reset), GFP_ATOMIC);
240         if (bus_reset == NULL) {
241                 fw_notify("Out of memory when allocating bus reset event\n");
242                 return;
243         }
244
245         fill_bus_reset_event(&bus_reset->reset, client);
246
247         queue_event(client, &bus_reset->event,
248                     &bus_reset->reset, sizeof(bus_reset->reset), NULL, 0);
249 }
250
251 void fw_device_cdev_update(struct fw_device *device)
252 {
253         for_each_client(device, queue_bus_reset_event);
254 }
255
256 static void wake_up_client(struct client *client)
257 {
258         wake_up_interruptible(&client->wait);
259 }
260
261 void fw_device_cdev_remove(struct fw_device *device)
262 {
263         for_each_client(device, wake_up_client);
264 }
265
266 static int ioctl_get_info(struct client *client, void *buffer)
267 {
268         struct fw_cdev_get_info *get_info = buffer;
269         struct fw_cdev_event_bus_reset bus_reset;
270
271         client->version = get_info->version;
272         get_info->version = FW_CDEV_VERSION;
273
274         if (get_info->rom != 0) {
275                 void __user *uptr = u64_to_uptr(get_info->rom);
276                 size_t want = get_info->rom_length;
277                 size_t have = client->device->config_rom_length * 4;
278
279                 if (copy_to_user(uptr, client->device->config_rom,
280                                  min(want, have)))
281                         return -EFAULT;
282         }
283         get_info->rom_length = client->device->config_rom_length * 4;
284
285         client->bus_reset_closure = get_info->bus_reset_closure;
286         if (get_info->bus_reset != 0) {
287                 void __user *uptr = u64_to_uptr(get_info->bus_reset);
288
289                 fill_bus_reset_event(&bus_reset, client);
290                 if (copy_to_user(uptr, &bus_reset, sizeof(bus_reset)))
291                         return -EFAULT;
292         }
293
294         get_info->card = client->device->card->index;
295
296         return 0;
297 }
298
299 static void
300 add_client_resource(struct client *client, struct client_resource *resource)
301 {
302         unsigned long flags;
303
304         spin_lock_irqsave(&client->lock, flags);
305         list_add_tail(&resource->link, &client->resource_list);
306         resource->handle = client->resource_handle++;
307         spin_unlock_irqrestore(&client->lock, flags);
308 }
309
310 static int
311 release_client_resource(struct client *client, u32 handle,
312                         struct client_resource **resource)
313 {
314         struct client_resource *r;
315         unsigned long flags;
316
317         spin_lock_irqsave(&client->lock, flags);
318         list_for_each_entry(r, &client->resource_list, link) {
319                 if (r->handle == handle) {
320                         list_del(&r->link);
321                         break;
322                 }
323         }
324         spin_unlock_irqrestore(&client->lock, flags);
325
326         if (&r->link == &client->resource_list)
327                 return -EINVAL;
328
329         if (resource)
330                 *resource = r;
331         else
332                 r->release(client, r);
333
334         return 0;
335 }
336
337 static void
338 release_transaction(struct client *client, struct client_resource *resource)
339 {
340         struct response *response =
341                 container_of(resource, struct response, resource);
342
343         fw_cancel_transaction(client->device->card, &response->transaction);
344 }
345
346 static void
347 complete_transaction(struct fw_card *card, int rcode,
348                      void *payload, size_t length, void *data)
349 {
350         struct response *response = data;
351         struct client *client = response->client;
352         unsigned long flags;
353
354         if (length < response->response.length)
355                 response->response.length = length;
356         if (rcode == RCODE_COMPLETE)
357                 memcpy(response->response.data, payload,
358                        response->response.length);
359
360         spin_lock_irqsave(&client->lock, flags);
361         list_del(&response->resource.link);
362         spin_unlock_irqrestore(&client->lock, flags);
363
364         response->response.type   = FW_CDEV_EVENT_RESPONSE;
365         response->response.rcode  = rcode;
366         queue_event(client, &response->event,
367                     &response->response, sizeof(response->response),
368                     response->response.data, response->response.length);
369 }
370
371 static int ioctl_send_request(struct client *client, void *buffer)
372 {
373         struct fw_device *device = client->device;
374         struct fw_cdev_send_request *request = buffer;
375         struct response *response;
376
377         /* What is the biggest size we'll accept, really? */
378         if (request->length > 4096)
379                 return -EINVAL;
380
381         response = kmalloc(sizeof(*response) + request->length, GFP_KERNEL);
382         if (response == NULL)
383                 return -ENOMEM;
384
385         response->client = client;
386         response->response.length = request->length;
387         response->response.closure = request->closure;
388
389         if (request->data &&
390             copy_from_user(response->response.data,
391                            u64_to_uptr(request->data), request->length)) {
392                 kfree(response);
393                 return -EFAULT;
394         }
395
396         response->resource.release = release_transaction;
397         add_client_resource(client, &response->resource);
398
399         fw_send_request(device->card, &response->transaction,
400                         request->tcode & 0x1f,
401                         device->node->node_id,
402                         request->generation,
403                         device->max_speed,
404                         request->offset,
405                         response->response.data, request->length,
406                         complete_transaction, response);
407
408         if (request->data)
409                 return sizeof(request) + request->length;
410         else
411                 return sizeof(request);
412 }
413
414 struct address_handler {
415         struct fw_address_handler handler;
416         __u64 closure;
417         struct client *client;
418         struct client_resource resource;
419 };
420
421 struct request {
422         struct fw_request *request;
423         void *data;
424         size_t length;
425         struct client_resource resource;
426 };
427
428 struct request_event {
429         struct event event;
430         struct fw_cdev_event_request request;
431 };
432
433 static void
434 release_request(struct client *client, struct client_resource *resource)
435 {
436         struct request *request =
437                 container_of(resource, struct request, resource);
438
439         fw_send_response(client->device->card, request->request,
440                          RCODE_CONFLICT_ERROR);
441         kfree(request);
442 }
443
444 static void
445 handle_request(struct fw_card *card, struct fw_request *r,
446                int tcode, int destination, int source,
447                int generation, int speed,
448                unsigned long long offset,
449                void *payload, size_t length, void *callback_data)
450 {
451         struct address_handler *handler = callback_data;
452         struct request *request;
453         struct request_event *e;
454         struct client *client = handler->client;
455
456         request = kmalloc(sizeof(*request), GFP_ATOMIC);
457         e = kmalloc(sizeof(*e), GFP_ATOMIC);
458         if (request == NULL || e == NULL) {
459                 kfree(request);
460                 kfree(e);
461                 fw_send_response(card, r, RCODE_CONFLICT_ERROR);
462                 return;
463         }
464
465         request->request = r;
466         request->data    = payload;
467         request->length  = length;
468
469         request->resource.release = release_request;
470         add_client_resource(client, &request->resource);
471
472         e->request.type    = FW_CDEV_EVENT_REQUEST;
473         e->request.tcode   = tcode;
474         e->request.offset  = offset;
475         e->request.length  = length;
476         e->request.handle  = request->resource.handle;
477         e->request.closure = handler->closure;
478
479         queue_event(client, &e->event,
480                     &e->request, sizeof(e->request), payload, length);
481 }
482
483 static void
484 release_address_handler(struct client *client,
485                         struct client_resource *resource)
486 {
487         struct address_handler *handler =
488                 container_of(resource, struct address_handler, resource);
489
490         fw_core_remove_address_handler(&handler->handler);
491         kfree(handler);
492 }
493
494 static int ioctl_allocate(struct client *client, void *buffer)
495 {
496         struct fw_cdev_allocate *request = buffer;
497         struct address_handler *handler;
498         struct fw_address_region region;
499
500         handler = kmalloc(sizeof(*handler), GFP_KERNEL);
501         if (handler == NULL)
502                 return -ENOMEM;
503
504         region.start = request->offset;
505         region.end = request->offset + request->length;
506         handler->handler.length = request->length;
507         handler->handler.address_callback = handle_request;
508         handler->handler.callback_data = handler;
509         handler->closure = request->closure;
510         handler->client = client;
511
512         if (fw_core_add_address_handler(&handler->handler, &region) < 0) {
513                 kfree(handler);
514                 return -EBUSY;
515         }
516
517         handler->resource.release = release_address_handler;
518         add_client_resource(client, &handler->resource);
519         request->handle = handler->resource.handle;
520
521         return 0;
522 }
523
524 static int ioctl_deallocate(struct client *client, void *buffer)
525 {
526         struct fw_cdev_deallocate *request = buffer;
527
528         return release_client_resource(client, request->handle, NULL);
529 }
530
531 static int ioctl_send_response(struct client *client, void *buffer)
532 {
533         struct fw_cdev_send_response *request = buffer;
534         struct client_resource *resource;
535         struct request *r;
536
537         if (release_client_resource(client, request->handle, &resource) < 0)
538                 return -EINVAL;
539         r = container_of(resource, struct request, resource);
540         if (request->length < r->length)
541                 r->length = request->length;
542         if (copy_from_user(r->data, u64_to_uptr(request->data), r->length))
543                 return -EFAULT;
544
545         fw_send_response(client->device->card, r->request, request->rcode);
546         kfree(r);
547
548         return 0;
549 }
550
551 static int ioctl_initiate_bus_reset(struct client *client, void *buffer)
552 {
553         struct fw_cdev_initiate_bus_reset *request = buffer;
554         int short_reset;
555
556         short_reset = (request->type == FW_CDEV_SHORT_RESET);
557
558         return fw_core_initiate_bus_reset(client->device->card, short_reset);
559 }
560
561 struct descriptor {
562         struct fw_descriptor d;
563         struct client_resource resource;
564         u32 data[0];
565 };
566
567 static void release_descriptor(struct client *client,
568                                struct client_resource *resource)
569 {
570         struct descriptor *descriptor =
571                 container_of(resource, struct descriptor, resource);
572
573         fw_core_remove_descriptor(&descriptor->d);
574         kfree(descriptor);
575 }
576
577 static int ioctl_add_descriptor(struct client *client, void *buffer)
578 {
579         struct fw_cdev_add_descriptor *request = buffer;
580         struct descriptor *descriptor;
581         int retval;
582
583         if (request->length > 256)
584                 return -EINVAL;
585
586         descriptor =
587                 kmalloc(sizeof(*descriptor) + request->length * 4, GFP_KERNEL);
588         if (descriptor == NULL)
589                 return -ENOMEM;
590
591         if (copy_from_user(descriptor->data,
592                            u64_to_uptr(request->data), request->length * 4)) {
593                 kfree(descriptor);
594                 return -EFAULT;
595         }
596
597         descriptor->d.length = request->length;
598         descriptor->d.immediate = request->immediate;
599         descriptor->d.key = request->key;
600         descriptor->d.data = descriptor->data;
601
602         retval = fw_core_add_descriptor(&descriptor->d);
603         if (retval < 0) {
604                 kfree(descriptor);
605                 return retval;
606         }
607
608         descriptor->resource.release = release_descriptor;
609         add_client_resource(client, &descriptor->resource);
610         request->handle = descriptor->resource.handle;
611
612         return 0;
613 }
614
615 static int ioctl_remove_descriptor(struct client *client, void *buffer)
616 {
617         struct fw_cdev_remove_descriptor *request = buffer;
618
619         return release_client_resource(client, request->handle, NULL);
620 }
621
622 static void
623 iso_callback(struct fw_iso_context *context, u32 cycle,
624              size_t header_length, void *header, void *data)
625 {
626         struct client *client = data;
627         struct iso_interrupt *irq;
628
629         irq = kzalloc(sizeof(*irq) + header_length, GFP_ATOMIC);
630         if (irq == NULL)
631                 return;
632
633         irq->interrupt.type      = FW_CDEV_EVENT_ISO_INTERRUPT;
634         irq->interrupt.closure   = client->iso_closure;
635         irq->interrupt.cycle     = cycle;
636         irq->interrupt.header_length = header_length;
637         memcpy(irq->interrupt.header, header, header_length);
638         queue_event(client, &irq->event, &irq->interrupt,
639                     sizeof(irq->interrupt) + header_length, NULL, 0);
640 }
641
642 static int ioctl_create_iso_context(struct client *client, void *buffer)
643 {
644         struct fw_cdev_create_iso_context *request = buffer;
645         struct fw_iso_context *context;
646
647         if (request->channel > 63)
648                 return -EINVAL;
649
650         switch (request->type) {
651         case FW_ISO_CONTEXT_RECEIVE:
652                 if (request->header_size < 4 || (request->header_size & 3))
653                         return -EINVAL;
654
655                 break;
656
657         case FW_ISO_CONTEXT_TRANSMIT:
658                 if (request->speed > SCODE_3200)
659                         return -EINVAL;
660
661                 break;
662
663         default:
664                 return -EINVAL;
665         }
666
667         context =  fw_iso_context_create(client->device->card,
668                                          request->type,
669                                          request->channel,
670                                          request->speed,
671                                          request->header_size,
672                                          iso_callback, client);
673         if (IS_ERR(context))
674                 return PTR_ERR(context);
675
676         client->iso_closure = request->closure;
677         client->iso_context = context;
678
679         /* We only support one context at this time. */
680         request->handle = 0;
681
682         return 0;
683 }
684
685 /* Macros for decoding the iso packet control header. */
686 #define GET_PAYLOAD_LENGTH(v)   ((v) & 0xffff)
687 #define GET_INTERRUPT(v)        (((v) >> 16) & 0x01)
688 #define GET_SKIP(v)             (((v) >> 17) & 0x01)
689 #define GET_TAG(v)              (((v) >> 18) & 0x02)
690 #define GET_SY(v)               (((v) >> 20) & 0x04)
691 #define GET_HEADER_LENGTH(v)    (((v) >> 24) & 0xff)
692
693 static int ioctl_queue_iso(struct client *client, void *buffer)
694 {
695         struct fw_cdev_queue_iso *request = buffer;
696         struct fw_cdev_iso_packet __user *p, *end, *next;
697         struct fw_iso_context *ctx = client->iso_context;
698         unsigned long payload, buffer_end, header_length;
699         u32 control;
700         int count;
701         struct {
702                 struct fw_iso_packet packet;
703                 u8 header[256];
704         } u;
705
706         if (ctx == NULL || request->handle != 0)
707                 return -EINVAL;
708
709         /*
710          * If the user passes a non-NULL data pointer, has mmap()'ed
711          * the iso buffer, and the pointer points inside the buffer,
712          * we setup the payload pointers accordingly.  Otherwise we
713          * set them both to 0, which will still let packets with
714          * payload_length == 0 through.  In other words, if no packets
715          * use the indirect payload, the iso buffer need not be mapped
716          * and the request->data pointer is ignored.
717          */
718
719         payload = (unsigned long)request->data - client->vm_start;
720         buffer_end = client->buffer.page_count << PAGE_SHIFT;
721         if (request->data == 0 || client->buffer.pages == NULL ||
722             payload >= buffer_end) {
723                 payload = 0;
724                 buffer_end = 0;
725         }
726
727         p = (struct fw_cdev_iso_packet __user *)u64_to_uptr(request->packets);
728
729         if (!access_ok(VERIFY_READ, p, request->size))
730                 return -EFAULT;
731
732         end = (void __user *)p + request->size;
733         count = 0;
734         while (p < end) {
735                 if (get_user(control, &p->control))
736                         return -EFAULT;
737                 u.packet.payload_length = GET_PAYLOAD_LENGTH(control);
738                 u.packet.interrupt = GET_INTERRUPT(control);
739                 u.packet.skip = GET_SKIP(control);
740                 u.packet.tag = GET_TAG(control);
741                 u.packet.sy = GET_SY(control);
742                 u.packet.header_length = GET_HEADER_LENGTH(control);
743
744                 if (ctx->type == FW_ISO_CONTEXT_TRANSMIT) {
745                         header_length = u.packet.header_length;
746                 } else {
747                         /*
748                          * We require that header_length is a multiple of
749                          * the fixed header size, ctx->header_size.
750                          */
751                         if (ctx->header_size == 0) {
752                                 if (u.packet.header_length > 0)
753                                         return -EINVAL;
754                         } else if (u.packet.header_length % ctx->header_size != 0) {
755                                 return -EINVAL;
756                         }
757                         header_length = 0;
758                 }
759
760                 next = (struct fw_cdev_iso_packet __user *)
761                         &p->header[header_length / 4];
762                 if (next > end)
763                         return -EINVAL;
764                 if (__copy_from_user
765                     (u.packet.header, p->header, header_length))
766                         return -EFAULT;
767                 if (u.packet.skip && ctx->type == FW_ISO_CONTEXT_TRANSMIT &&
768                     u.packet.header_length + u.packet.payload_length > 0)
769                         return -EINVAL;
770                 if (payload + u.packet.payload_length > buffer_end)
771                         return -EINVAL;
772
773                 if (fw_iso_context_queue(ctx, &u.packet,
774                                          &client->buffer, payload))
775                         break;
776
777                 p = next;
778                 payload += u.packet.payload_length;
779                 count++;
780         }
781
782         request->size    -= uptr_to_u64(p) - request->packets;
783         request->packets  = uptr_to_u64(p);
784         request->data     = client->vm_start + payload;
785
786         return count;
787 }
788
789 static int ioctl_start_iso(struct client *client, void *buffer)
790 {
791         struct fw_cdev_start_iso *request = buffer;
792
793         if (request->handle != 0)
794                 return -EINVAL;
795         if (client->iso_context->type == FW_ISO_CONTEXT_RECEIVE) {
796                 if (request->tags == 0 || request->tags > 15)
797                         return -EINVAL;
798
799                 if (request->sync > 15)
800                         return -EINVAL;
801         }
802
803         return fw_iso_context_start(client->iso_context, request->cycle,
804                                     request->sync, request->tags);
805 }
806
807 static int ioctl_stop_iso(struct client *client, void *buffer)
808 {
809         struct fw_cdev_stop_iso *request = buffer;
810
811         if (request->handle != 0)
812                 return -EINVAL;
813
814         return fw_iso_context_stop(client->iso_context);
815 }
816
817 static int ioctl_get_cycle_timer(struct client *client, void *buffer)
818 {
819         struct fw_cdev_get_cycle_timer *request = buffer;
820         struct fw_card *card = client->device->card;
821         unsigned long long bus_time;
822         struct timeval tv;
823         unsigned long flags;
824
825         preempt_disable();
826         local_irq_save(flags);
827
828         bus_time = card->driver->get_bus_time(card);
829         do_gettimeofday(&tv);
830
831         local_irq_restore(flags);
832         preempt_enable();
833
834         request->local_time = tv.tv_sec * 1000000ULL + tv.tv_usec;
835         request->cycle_timer = bus_time & 0xffffffff;
836         return 0;
837 }
838
839 static int (* const ioctl_handlers[])(struct client *client, void *buffer) = {
840         ioctl_get_info,
841         ioctl_send_request,
842         ioctl_allocate,
843         ioctl_deallocate,
844         ioctl_send_response,
845         ioctl_initiate_bus_reset,
846         ioctl_add_descriptor,
847         ioctl_remove_descriptor,
848         ioctl_create_iso_context,
849         ioctl_queue_iso,
850         ioctl_start_iso,
851         ioctl_stop_iso,
852         ioctl_get_cycle_timer,
853 };
854
855 static int
856 dispatch_ioctl(struct client *client, unsigned int cmd, void __user *arg)
857 {
858         char buffer[256];
859         int retval;
860
861         if (_IOC_TYPE(cmd) != '#' ||
862             _IOC_NR(cmd) >= ARRAY_SIZE(ioctl_handlers))
863                 return -EINVAL;
864
865         if (_IOC_DIR(cmd) & _IOC_WRITE) {
866                 if (_IOC_SIZE(cmd) > sizeof(buffer) ||
867                     copy_from_user(buffer, arg, _IOC_SIZE(cmd)))
868                         return -EFAULT;
869         }
870
871         retval = ioctl_handlers[_IOC_NR(cmd)](client, buffer);
872         if (retval < 0)
873                 return retval;
874
875         if (_IOC_DIR(cmd) & _IOC_READ) {
876                 if (_IOC_SIZE(cmd) > sizeof(buffer) ||
877                     copy_to_user(arg, buffer, _IOC_SIZE(cmd)))
878                         return -EFAULT;
879         }
880
881         return 0;
882 }
883
884 static long
885 fw_device_op_ioctl(struct file *file,
886                    unsigned int cmd, unsigned long arg)
887 {
888         struct client *client = file->private_data;
889
890         return dispatch_ioctl(client, cmd, (void __user *) arg);
891 }
892
893 #ifdef CONFIG_COMPAT
894 static long
895 fw_device_op_compat_ioctl(struct file *file,
896                           unsigned int cmd, unsigned long arg)
897 {
898         struct client *client = file->private_data;
899
900         return dispatch_ioctl(client, cmd, compat_ptr(arg));
901 }
902 #endif
903
904 static int fw_device_op_mmap(struct file *file, struct vm_area_struct *vma)
905 {
906         struct client *client = file->private_data;
907         enum dma_data_direction direction;
908         unsigned long size;
909         int page_count, retval;
910
911         /* FIXME: We could support multiple buffers, but we don't. */
912         if (client->buffer.pages != NULL)
913                 return -EBUSY;
914
915         if (!(vma->vm_flags & VM_SHARED))
916                 return -EINVAL;
917
918         if (vma->vm_start & ~PAGE_MASK)
919                 return -EINVAL;
920
921         client->vm_start = vma->vm_start;
922         size = vma->vm_end - vma->vm_start;
923         page_count = size >> PAGE_SHIFT;
924         if (size & ~PAGE_MASK)
925                 return -EINVAL;
926
927         if (vma->vm_flags & VM_WRITE)
928                 direction = DMA_TO_DEVICE;
929         else
930                 direction = DMA_FROM_DEVICE;
931
932         retval = fw_iso_buffer_init(&client->buffer, client->device->card,
933                                     page_count, direction);
934         if (retval < 0)
935                 return retval;
936
937         retval = fw_iso_buffer_map(&client->buffer, vma);
938         if (retval < 0)
939                 fw_iso_buffer_destroy(&client->buffer, client->device->card);
940
941         return retval;
942 }
943
944 static int fw_device_op_release(struct inode *inode, struct file *file)
945 {
946         struct client *client = file->private_data;
947         struct event *e, *next_e;
948         struct client_resource *r, *next_r;
949         unsigned long flags;
950
951         if (client->buffer.pages)
952                 fw_iso_buffer_destroy(&client->buffer, client->device->card);
953
954         if (client->iso_context)
955                 fw_iso_context_destroy(client->iso_context);
956
957         list_for_each_entry_safe(r, next_r, &client->resource_list, link)
958                 r->release(client, r);
959
960         /*
961          * FIXME: We should wait for the async tasklets to stop
962          * running before freeing the memory.
963          */
964
965         list_for_each_entry_safe(e, next_e, &client->event_list, link)
966                 kfree(e);
967
968         spin_lock_irqsave(&client->device->card->lock, flags);
969         list_del(&client->link);
970         spin_unlock_irqrestore(&client->device->card->lock, flags);
971
972         fw_device_put(client->device);
973         kfree(client);
974
975         return 0;
976 }
977
978 static unsigned int fw_device_op_poll(struct file *file, poll_table * pt)
979 {
980         struct client *client = file->private_data;
981         unsigned int mask = 0;
982
983         poll_wait(file, &client->wait, pt);
984
985         if (fw_device_is_shutdown(client->device))
986                 mask |= POLLHUP | POLLERR;
987         if (!list_empty(&client->event_list))
988                 mask |= POLLIN | POLLRDNORM;
989
990         return mask;
991 }
992
993 const struct file_operations fw_device_ops = {
994         .owner          = THIS_MODULE,
995         .open           = fw_device_op_open,
996         .read           = fw_device_op_read,
997         .unlocked_ioctl = fw_device_op_ioctl,
998         .poll           = fw_device_op_poll,
999         .release        = fw_device_op_release,
1000         .mmap           = fw_device_op_mmap,
1001
1002 #ifdef CONFIG_COMPAT
1003         .compat_ioctl   = fw_device_op_compat_ioctl,
1004 #endif
1005 };