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