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, ®ion) < 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 };
1013
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