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path: root/drivers/firewire/fw-cdev.c
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Diffstat (limited to 'drivers/firewire/fw-cdev.c')
-rw-r--r--drivers/firewire/fw-cdev.c954
1 files changed, 954 insertions, 0 deletions
diff --git a/drivers/firewire/fw-cdev.c b/drivers/firewire/fw-cdev.c
new file mode 100644
index 000000000000..88b8fd917f54
--- /dev/null
+++ b/drivers/firewire/fw-cdev.c
@@ -0,0 +1,954 @@
1/* -*- c-basic-offset: 8 -*-
2 *
3 * fw-device-cdev.c - Char device for device raw access
4 *
5 * Copyright (C) 2005-2006 Kristian Hoegsberg <krh@bitplanet.net>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software Foundation,
19 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20 */
21
22#include <linux/module.h>
23#include <linux/kernel.h>
24#include <linux/wait.h>
25#include <linux/errno.h>
26#include <linux/device.h>
27#include <linux/vmalloc.h>
28#include <linux/poll.h>
29#include <linux/delay.h>
30#include <linux/mm.h>
31#include <linux/idr.h>
32#include <linux/compat.h>
33#include <linux/firewire-cdev.h>
34#include <asm/uaccess.h>
35#include "fw-transaction.h"
36#include "fw-topology.h"
37#include "fw-device.h"
38
39/* dequeue_event() just kfree()'s the event, so the event has to be
40 * the first field in the struct. */
41
42struct client;
43struct client_resource {
44 struct list_head link;
45 void (*release)(struct client *client, struct client_resource *r);
46 u32 handle;
47};
48
49struct event {
50 struct { void *data; size_t size; } v[2];
51 struct list_head link;
52};
53
54struct bus_reset {
55 struct event event;
56 struct fw_cdev_event_bus_reset reset;
57};
58
59struct response {
60 struct event event;
61 struct fw_transaction transaction;
62 struct client *client;
63 struct client_resource resource;
64 struct fw_cdev_event_response response;
65};
66
67struct iso_interrupt {
68 struct event event;
69 struct fw_cdev_event_iso_interrupt interrupt;
70};
71
72struct client {
73 u32 version;
74 struct fw_device *device;
75 spinlock_t lock;
76 u32 resource_handle;
77 struct list_head resource_list;
78 struct list_head event_list;
79 wait_queue_head_t wait;
80 u64 bus_reset_closure;
81
82 struct fw_iso_context *iso_context;
83 u64 iso_closure;
84 struct fw_iso_buffer buffer;
85 unsigned long vm_start;
86
87 struct list_head link;
88};
89
90static inline void __user *
91u64_to_uptr(__u64 value)
92{
93 return (void __user *)(unsigned long)value;
94}
95
96static inline __u64
97uptr_to_u64(void __user *ptr)
98{
99 return (__u64)(unsigned long)ptr;
100}
101
102static int fw_device_op_open(struct inode *inode, struct file *file)
103{
104 struct fw_device *device;
105 struct client *client;
106 unsigned long flags;
107
108 device = fw_device_from_devt(inode->i_rdev);
109 if (device == NULL)
110 return -ENODEV;
111
112 client = kzalloc(sizeof *client, GFP_KERNEL);
113 if (client == NULL)
114 return -ENOMEM;
115
116 client->device = fw_device_get(device);
117 INIT_LIST_HEAD(&client->event_list);
118 INIT_LIST_HEAD(&client->resource_list);
119 spin_lock_init(&client->lock);
120 init_waitqueue_head(&client->wait);
121
122 file->private_data = client;
123
124 spin_lock_irqsave(&device->card->lock, flags);
125 list_add_tail(&client->link, &device->client_list);
126 spin_unlock_irqrestore(&device->card->lock, flags);
127
128 return 0;
129}
130
131static void queue_event(struct client *client, struct event *event,
132 void *data0, size_t size0, void *data1, size_t size1)
133{
134 unsigned long flags;
135
136 event->v[0].data = data0;
137 event->v[0].size = size0;
138 event->v[1].data = data1;
139 event->v[1].size = size1;
140
141 spin_lock_irqsave(&client->lock, flags);
142
143 list_add_tail(&event->link, &client->event_list);
144 wake_up_interruptible(&client->wait);
145
146 spin_unlock_irqrestore(&client->lock, flags);
147}
148
149static int
150dequeue_event(struct client *client, char __user *buffer, size_t count)
151{
152 unsigned long flags;
153 struct event *event;
154 size_t size, total;
155 int i, retval;
156
157 retval = wait_event_interruptible(client->wait,
158 !list_empty(&client->event_list) ||
159 fw_device_is_shutdown(client->device));
160 if (retval < 0)
161 return retval;
162
163 if (list_empty(&client->event_list) &&
164 fw_device_is_shutdown(client->device))
165 return -ENODEV;
166
167 spin_lock_irqsave(&client->lock, flags);
168 event = container_of(client->event_list.next, struct event, link);
169 list_del(&event->link);
170 spin_unlock_irqrestore(&client->lock, flags);
171
172 total = 0;
173 for (i = 0; i < ARRAY_SIZE(event->v) && total < count; i++) {
174 size = min(event->v[i].size, count - total);
175 if (copy_to_user(buffer + total, event->v[i].data, size)) {
176 retval = -EFAULT;
177 goto out;
178 }
179 total += size;
180 }
181 retval = total;
182
183 out:
184 kfree(event);
185
186 return retval;
187}
188
189static ssize_t
190fw_device_op_read(struct file *file,
191 char __user *buffer, size_t count, loff_t *offset)
192{
193 struct client *client = file->private_data;
194
195 return dequeue_event(client, buffer, count);
196}
197
198static void
199fill_bus_reset_event(struct fw_cdev_event_bus_reset *event,
200 struct client *client)
201{
202 struct fw_card *card = client->device->card;
203
204 event->closure = client->bus_reset_closure;
205 event->type = FW_CDEV_EVENT_BUS_RESET;
206 event->node_id = client->device->node_id;
207 event->local_node_id = card->local_node->node_id;
208 event->bm_node_id = 0; /* FIXME: We don't track the BM. */
209 event->irm_node_id = card->irm_node->node_id;
210 event->root_node_id = card->root_node->node_id;
211 event->generation = card->generation;
212}
213
214static void
215for_each_client(struct fw_device *device,
216 void (*callback)(struct client *client))
217{
218 struct fw_card *card = device->card;
219 struct client *c;
220 unsigned long flags;
221
222 spin_lock_irqsave(&card->lock, flags);
223
224 list_for_each_entry(c, &device->client_list, link)
225 callback(c);
226
227 spin_unlock_irqrestore(&card->lock, flags);
228}
229
230static void
231queue_bus_reset_event(struct client *client)
232{
233 struct bus_reset *bus_reset;
234
235 bus_reset = kzalloc(sizeof *bus_reset, GFP_ATOMIC);
236 if (bus_reset == NULL) {
237 fw_notify("Out of memory when allocating bus reset event\n");
238 return;
239 }
240
241 fill_bus_reset_event(&bus_reset->reset, client);
242
243 queue_event(client, &bus_reset->event,
244 &bus_reset->reset, sizeof bus_reset->reset, NULL, 0);
245}
246
247void fw_device_cdev_update(struct fw_device *device)
248{
249 for_each_client(device, queue_bus_reset_event);
250}
251
252static void wake_up_client(struct client *client)
253{
254 wake_up_interruptible(&client->wait);
255}
256
257void fw_device_cdev_remove(struct fw_device *device)
258{
259 for_each_client(device, wake_up_client);
260}
261
262static int ioctl_get_info(struct client *client, void *buffer)
263{
264 struct fw_cdev_get_info *get_info = buffer;
265 struct fw_cdev_event_bus_reset bus_reset;
266
267 client->version = get_info->version;
268 get_info->version = FW_CDEV_VERSION;
269
270 if (get_info->rom != 0) {
271 void __user *uptr = u64_to_uptr(get_info->rom);
272 size_t want = get_info->rom_length;
273 size_t have = client->device->config_rom_length * 4;
274
275 if (copy_to_user(uptr, client->device->config_rom,
276 min(want, have)))
277 return -EFAULT;
278 }
279 get_info->rom_length = client->device->config_rom_length * 4;
280
281 client->bus_reset_closure = get_info->bus_reset_closure;
282 if (get_info->bus_reset != 0) {
283 void __user *uptr = u64_to_uptr(get_info->bus_reset);
284
285 fill_bus_reset_event(&bus_reset, client);
286 if (copy_to_user(uptr, &bus_reset, sizeof bus_reset))
287 return -EFAULT;
288 }
289
290 get_info->card = client->device->card->index;
291
292 return 0;
293}
294
295static void
296add_client_resource(struct client *client, struct client_resource *resource)
297{
298 unsigned long flags;
299
300 spin_lock_irqsave(&client->lock, flags);
301 list_add_tail(&resource->link, &client->resource_list);
302 resource->handle = client->resource_handle++;
303 spin_unlock_irqrestore(&client->lock, flags);
304}
305
306static int
307release_client_resource(struct client *client, u32 handle,
308 struct client_resource **resource)
309{
310 struct client_resource *r;
311 unsigned long flags;
312
313 spin_lock_irqsave(&client->lock, flags);
314 list_for_each_entry(r, &client->resource_list, link) {
315 if (r->handle == handle) {
316 list_del(&r->link);
317 break;
318 }
319 }
320 spin_unlock_irqrestore(&client->lock, flags);
321
322 if (&r->link == &client->resource_list)
323 return -EINVAL;
324
325 if (resource)
326 *resource = r;
327 else
328 r->release(client, r);
329
330 return 0;
331}
332
333static void
334release_transaction(struct client *client, struct client_resource *resource)
335{
336 struct response *response =
337 container_of(resource, struct response, resource);
338
339 fw_cancel_transaction(client->device->card, &response->transaction);
340}
341
342static void
343complete_transaction(struct fw_card *card, int rcode,
344 void *payload, size_t length, void *data)
345{
346 struct response *response = data;
347 struct client *client = response->client;
348 unsigned long flags;
349
350 if (length < response->response.length)
351 response->response.length = length;
352 if (rcode == RCODE_COMPLETE)
353 memcpy(response->response.data, payload,
354 response->response.length);
355
356 spin_lock_irqsave(&client->lock, flags);
357 list_del(&response->resource.link);
358 spin_unlock_irqrestore(&client->lock, flags);
359
360 response->response.type = FW_CDEV_EVENT_RESPONSE;
361 response->response.rcode = rcode;
362 queue_event(client, &response->event,
363 &response->response, sizeof response->response,
364 response->response.data, response->response.length);
365}
366
367static ssize_t ioctl_send_request(struct client *client, void *buffer)
368{
369 struct fw_device *device = client->device;
370 struct fw_cdev_send_request *request = buffer;
371 struct response *response;
372
373 /* What is the biggest size we'll accept, really? */
374 if (request->length > 4096)
375 return -EINVAL;
376
377 response = kmalloc(sizeof *response + request->length, GFP_KERNEL);
378 if (response == NULL)
379 return -ENOMEM;
380
381 response->client = client;
382 response->response.length = request->length;
383 response->response.closure = request->closure;
384
385 if (request->data &&
386 copy_from_user(response->response.data,
387 u64_to_uptr(request->data), request->length)) {
388 kfree(response);
389 return -EFAULT;
390 }
391
392 response->resource.release = release_transaction;
393 add_client_resource(client, &response->resource);
394
395 fw_send_request(device->card, &response->transaction,
396 request->tcode & 0x1f,
397 device->node->node_id,
398 request->generation,
399 device->node->max_speed,
400 request->offset,
401 response->response.data, request->length,
402 complete_transaction, response);
403
404 if (request->data)
405 return sizeof request + request->length;
406 else
407 return sizeof request;
408}
409
410struct address_handler {
411 struct fw_address_handler handler;
412 __u64 closure;
413 struct client *client;
414 struct client_resource resource;
415};
416
417struct request {
418 struct fw_request *request;
419 void *data;
420 size_t length;
421 struct client_resource resource;
422};
423
424struct request_event {
425 struct event event;
426 struct fw_cdev_event_request request;
427};
428
429static void
430release_request(struct client *client, struct client_resource *resource)
431{
432 struct request *request =
433 container_of(resource, struct request, resource);
434
435 fw_send_response(client->device->card, request->request,
436 RCODE_CONFLICT_ERROR);
437 kfree(request);
438}
439
440static void
441handle_request(struct fw_card *card, struct fw_request *r,
442 int tcode, int destination, int source,
443 int generation, int speed,
444 unsigned long long offset,
445 void *payload, size_t length, void *callback_data)
446{
447 struct address_handler *handler = callback_data;
448 struct request *request;
449 struct request_event *e;
450 struct client *client = handler->client;
451
452 request = kmalloc(sizeof *request, GFP_ATOMIC);
453 e = kmalloc(sizeof *e, GFP_ATOMIC);
454 if (request == NULL || e == NULL) {
455 kfree(request);
456 kfree(e);
457 fw_send_response(card, r, RCODE_CONFLICT_ERROR);
458 return;
459 }
460
461 request->request = r;
462 request->data = payload;
463 request->length = length;
464
465 request->resource.release = release_request;
466 add_client_resource(client, &request->resource);
467
468 e->request.type = FW_CDEV_EVENT_REQUEST;
469 e->request.tcode = tcode;
470 e->request.offset = offset;
471 e->request.length = length;
472 e->request.handle = request->resource.handle;
473 e->request.closure = handler->closure;
474
475 queue_event(client, &e->event,
476 &e->request, sizeof e->request, payload, length);
477}
478
479static void
480release_address_handler(struct client *client,
481 struct client_resource *resource)
482{
483 struct address_handler *handler =
484 container_of(resource, struct address_handler, resource);
485
486 fw_core_remove_address_handler(&handler->handler);
487 kfree(handler);
488}
489
490static int ioctl_allocate(struct client *client, void *buffer)
491{
492 struct fw_cdev_allocate *request = buffer;
493 struct address_handler *handler;
494 struct fw_address_region region;
495
496 handler = kmalloc(sizeof *handler, GFP_KERNEL);
497 if (handler == NULL)
498 return -ENOMEM;
499
500 region.start = request->offset;
501 region.end = request->offset + request->length;
502 handler->handler.length = request->length;
503 handler->handler.address_callback = handle_request;
504 handler->handler.callback_data = handler;
505 handler->closure = request->closure;
506 handler->client = client;
507
508 if (fw_core_add_address_handler(&handler->handler, &region) < 0) {
509 kfree(handler);
510 return -EBUSY;
511 }
512
513 handler->resource.release = release_address_handler;
514 add_client_resource(client, &handler->resource);
515 request->handle = handler->resource.handle;
516
517 return 0;
518}
519
520static int ioctl_deallocate(struct client *client, void *buffer)
521{
522 struct fw_cdev_deallocate *request = buffer;
523
524 return release_client_resource(client, request->handle, NULL);
525}
526
527static int ioctl_send_response(struct client *client, void *buffer)
528{
529 struct fw_cdev_send_response *request = buffer;
530 struct client_resource *resource;
531 struct request *r;
532
533 if (release_client_resource(client, request->handle, &resource) < 0)
534 return -EINVAL;
535 r = container_of(resource, struct request, resource);
536 if (request->length < r->length)
537 r->length = request->length;
538 if (copy_from_user(r->data, u64_to_uptr(request->data), r->length))
539 return -EFAULT;
540
541 fw_send_response(client->device->card, r->request, request->rcode);
542 kfree(r);
543
544 return 0;
545}
546
547static int ioctl_initiate_bus_reset(struct client *client, void *buffer)
548{
549 struct fw_cdev_initiate_bus_reset *request = buffer;
550 int short_reset;
551
552 short_reset = (request->type == FW_CDEV_SHORT_RESET);
553
554 return fw_core_initiate_bus_reset(client->device->card, short_reset);
555}
556
557struct descriptor {
558 struct fw_descriptor d;
559 struct client_resource resource;
560 u32 data[0];
561};
562
563static void release_descriptor(struct client *client,
564 struct client_resource *resource)
565{
566 struct descriptor *descriptor =
567 container_of(resource, struct descriptor, resource);
568
569 fw_core_remove_descriptor(&descriptor->d);
570 kfree(descriptor);
571}
572
573static int ioctl_add_descriptor(struct client *client, void *buffer)
574{
575 struct fw_cdev_add_descriptor *request = buffer;
576 struct descriptor *descriptor;
577 int retval;
578
579 if (request->length > 256)
580 return -EINVAL;
581
582 descriptor =
583 kmalloc(sizeof *descriptor + request->length * 4, GFP_KERNEL);
584 if (descriptor == NULL)
585 return -ENOMEM;
586
587 if (copy_from_user(descriptor->data,
588 u64_to_uptr(request->data), request->length * 4)) {
589 kfree(descriptor);
590 return -EFAULT;
591 }
592
593 descriptor->d.length = request->length;
594 descriptor->d.immediate = request->immediate;
595 descriptor->d.key = request->key;
596 descriptor->d.data = descriptor->data;
597
598 retval = fw_core_add_descriptor(&descriptor->d);
599 if (retval < 0) {
600 kfree(descriptor);
601 return retval;
602 }
603
604 descriptor->resource.release = release_descriptor;
605 add_client_resource(client, &descriptor->resource);
606 request->handle = descriptor->resource.handle;
607
608 return 0;
609}
610
611static int ioctl_remove_descriptor(struct client *client, void *buffer)
612{
613 struct fw_cdev_remove_descriptor *request = buffer;
614
615 return release_client_resource(client, request->handle, NULL);
616}
617
618static void
619iso_callback(struct fw_iso_context *context, u32 cycle,
620 size_t header_length, void *header, void *data)
621{
622 struct client *client = data;
623 struct iso_interrupt *interrupt;
624
625 interrupt = kzalloc(sizeof *interrupt + header_length, GFP_ATOMIC);
626 if (interrupt == NULL)
627 return;
628
629 interrupt->interrupt.type = FW_CDEV_EVENT_ISO_INTERRUPT;
630 interrupt->interrupt.closure = client->iso_closure;
631 interrupt->interrupt.cycle = cycle;
632 interrupt->interrupt.header_length = header_length;
633 memcpy(interrupt->interrupt.header, header, header_length);
634 queue_event(client, &interrupt->event,
635 &interrupt->interrupt,
636 sizeof interrupt->interrupt + header_length, NULL, 0);
637}
638
639static int ioctl_create_iso_context(struct client *client, void *buffer)
640{
641 struct fw_cdev_create_iso_context *request = buffer;
642
643 if (request->channel > 63)
644 return -EINVAL;
645
646 switch (request->type) {
647 case FW_ISO_CONTEXT_RECEIVE:
648 if (request->header_size < 4 || (request->header_size & 3))
649 return -EINVAL;
650
651 break;
652
653 case FW_ISO_CONTEXT_TRANSMIT:
654 if (request->speed > SCODE_3200)
655 return -EINVAL;
656
657 break;
658
659 default:
660 return -EINVAL;
661 }
662
663 client->iso_closure = request->closure;
664 client->iso_context = fw_iso_context_create(client->device->card,
665 request->type,
666 request->channel,
667 request->speed,
668 request->header_size,
669 iso_callback, client);
670 if (IS_ERR(client->iso_context))
671 return PTR_ERR(client->iso_context);
672
673 /* We only support one context at this time. */
674 request->handle = 0;
675
676 return 0;
677}
678
679static int ioctl_queue_iso(struct client *client, void *buffer)
680{
681 struct fw_cdev_queue_iso *request = buffer;
682 struct fw_cdev_iso_packet __user *p, *end, *next;
683 struct fw_iso_context *ctx = client->iso_context;
684 unsigned long payload, buffer_end, header_length;
685 int count;
686 struct {
687 struct fw_iso_packet packet;
688 u8 header[256];
689 } u;
690
691 if (ctx == NULL || request->handle != 0)
692 return -EINVAL;
693
694 /* If the user passes a non-NULL data pointer, has mmap()'ed
695 * the iso buffer, and the pointer points inside the buffer,
696 * we setup the payload pointers accordingly. Otherwise we
697 * set them both to 0, which will still let packets with
698 * payload_length == 0 through. In other words, if no packets
699 * use the indirect payload, the iso buffer need not be mapped
700 * and the request->data pointer is ignored.*/
701
702 payload = (unsigned long)request->data - client->vm_start;
703 buffer_end = client->buffer.page_count << PAGE_SHIFT;
704 if (request->data == 0 || client->buffer.pages == NULL ||
705 payload >= buffer_end) {
706 payload = 0;
707 buffer_end = 0;
708 }
709
710 if (!access_ok(VERIFY_READ, request->packets, request->size))
711 return -EFAULT;
712
713 p = (struct fw_cdev_iso_packet __user *)u64_to_uptr(request->packets);
714 end = (void __user *)p + request->size;
715 count = 0;
716 while (p < end) {
717 if (__copy_from_user(&u.packet, p, sizeof *p))
718 return -EFAULT;
719
720 if (ctx->type == FW_ISO_CONTEXT_TRANSMIT) {
721 header_length = u.packet.header_length;
722 } else {
723 /* We require that header_length is a multiple of
724 * the fixed header size, ctx->header_size */
725 if (ctx->header_size == 0) {
726 if (u.packet.header_length > 0)
727 return -EINVAL;
728 } else if (u.packet.header_length % ctx->header_size != 0) {
729 return -EINVAL;
730 }
731 header_length = 0;
732 }
733
734 next = (struct fw_cdev_iso_packet __user *)
735 &p->header[header_length / 4];
736 if (next > end)
737 return -EINVAL;
738 if (__copy_from_user
739 (u.packet.header, p->header, header_length))
740 return -EFAULT;
741 if (u.packet.skip && ctx->type == FW_ISO_CONTEXT_TRANSMIT &&
742 u.packet.header_length + u.packet.payload_length > 0)
743 return -EINVAL;
744 if (payload + u.packet.payload_length > buffer_end)
745 return -EINVAL;
746
747 if (fw_iso_context_queue(ctx, &u.packet,
748 &client->buffer, payload))
749 break;
750
751 p = next;
752 payload += u.packet.payload_length;
753 count++;
754 }
755
756 request->size -= uptr_to_u64(p) - request->packets;
757 request->packets = uptr_to_u64(p);
758 request->data = client->vm_start + payload;
759
760 return count;
761}
762
763static int ioctl_start_iso(struct client *client, void *buffer)
764{
765 struct fw_cdev_start_iso *request = buffer;
766
767 if (request->handle != 0)
768 return -EINVAL;
769 if (client->iso_context->type == FW_ISO_CONTEXT_RECEIVE) {
770 if (request->tags == 0 || request->tags > 15)
771 return -EINVAL;
772
773 if (request->sync > 15)
774 return -EINVAL;
775 }
776
777 return fw_iso_context_start(client->iso_context, request->cycle,
778 request->sync, request->tags);
779}
780
781static int ioctl_stop_iso(struct client *client, void *buffer)
782{
783 struct fw_cdev_stop_iso *request = buffer;
784
785 if (request->handle != 0)
786 return -EINVAL;
787
788 return fw_iso_context_stop(client->iso_context);
789}
790
791static int (* const ioctl_handlers[])(struct client *client, void *buffer) = {
792 ioctl_get_info,
793 ioctl_send_request,
794 ioctl_allocate,
795 ioctl_deallocate,
796 ioctl_send_response,
797 ioctl_initiate_bus_reset,
798 ioctl_add_descriptor,
799 ioctl_remove_descriptor,
800 ioctl_create_iso_context,
801 ioctl_queue_iso,
802 ioctl_start_iso,
803 ioctl_stop_iso,
804};
805
806static int
807dispatch_ioctl(struct client *client, unsigned int cmd, void __user *arg)
808{
809 char buffer[256];
810 int retval;
811
812 if (_IOC_TYPE(cmd) != '#' ||
813 _IOC_NR(cmd) >= ARRAY_SIZE(ioctl_handlers))
814 return -EINVAL;
815
816 if (_IOC_DIR(cmd) & _IOC_WRITE) {
817 if (_IOC_SIZE(cmd) > sizeof buffer ||
818 copy_from_user(buffer, arg, _IOC_SIZE(cmd)))
819 return -EFAULT;
820 }
821
822 retval = ioctl_handlers[_IOC_NR(cmd)](client, buffer);
823 if (retval < 0)
824 return retval;
825
826 if (_IOC_DIR(cmd) & _IOC_READ) {
827 if (_IOC_SIZE(cmd) > sizeof buffer ||
828 copy_to_user(arg, buffer, _IOC_SIZE(cmd)))
829 return -EFAULT;
830 }
831
832 return 0;
833}
834
835static long
836fw_device_op_ioctl(struct file *file,
837 unsigned int cmd, unsigned long arg)
838{
839 struct client *client = file->private_data;
840
841 return dispatch_ioctl(client, cmd, (void __user *) arg);
842}
843
844#ifdef CONFIG_COMPAT
845static long
846fw_device_op_compat_ioctl(struct file *file,
847 unsigned int cmd, unsigned long arg)
848{
849 struct client *client = file->private_data;
850
851 return dispatch_ioctl(client, cmd, compat_ptr(arg));
852}
853#endif
854
855static int fw_device_op_mmap(struct file *file, struct vm_area_struct *vma)
856{
857 struct client *client = file->private_data;
858 enum dma_data_direction direction;
859 unsigned long size;
860 int page_count, retval;
861
862 /* FIXME: We could support multiple buffers, but we don't. */
863 if (client->buffer.pages != NULL)
864 return -EBUSY;
865
866 if (!(vma->vm_flags & VM_SHARED))
867 return -EINVAL;
868
869 if (vma->vm_start & ~PAGE_MASK)
870 return -EINVAL;
871
872 client->vm_start = vma->vm_start;
873 size = vma->vm_end - vma->vm_start;
874 page_count = size >> PAGE_SHIFT;
875 if (size & ~PAGE_MASK)
876 return -EINVAL;
877
878 if (vma->vm_flags & VM_WRITE)
879 direction = DMA_TO_DEVICE;
880 else
881 direction = DMA_FROM_DEVICE;
882
883 retval = fw_iso_buffer_init(&client->buffer, client->device->card,
884 page_count, direction);
885 if (retval < 0)
886 return retval;
887
888 retval = fw_iso_buffer_map(&client->buffer, vma);
889 if (retval < 0)
890 fw_iso_buffer_destroy(&client->buffer, client->device->card);
891
892 return retval;
893}
894
895static int fw_device_op_release(struct inode *inode, struct file *file)
896{
897 struct client *client = file->private_data;
898 struct event *e, *next_e;
899 struct client_resource *r, *next_r;
900 unsigned long flags;
901
902 if (client->buffer.pages)
903 fw_iso_buffer_destroy(&client->buffer, client->device->card);
904
905 if (client->iso_context)
906 fw_iso_context_destroy(client->iso_context);
907
908 list_for_each_entry_safe(r, next_r, &client->resource_list, link)
909 r->release(client, r);
910
911 /* FIXME: We should wait for the async tasklets to stop
912 * running before freeing the memory. */
913
914 list_for_each_entry_safe(e, next_e, &client->event_list, link)
915 kfree(e);
916
917 spin_lock_irqsave(&client->device->card->lock, flags);
918 list_del(&client->link);
919 spin_unlock_irqrestore(&client->device->card->lock, flags);
920
921 fw_device_put(client->device);
922 kfree(client);
923
924 return 0;
925}
926
927static unsigned int fw_device_op_poll(struct file *file, poll_table * pt)
928{
929 struct client *client = file->private_data;
930 unsigned int mask = 0;
931
932 poll_wait(file, &client->wait, pt);
933
934 if (fw_device_is_shutdown(client->device))
935 mask |= POLLHUP | POLLERR;
936 if (!list_empty(&client->event_list))
937 mask |= POLLIN | POLLRDNORM;
938
939 return mask;
940}
941
942const struct file_operations fw_device_ops = {
943 .owner = THIS_MODULE,
944 .open = fw_device_op_open,
945 .read = fw_device_op_read,
946 .unlocked_ioctl = fw_device_op_ioctl,
947 .poll = fw_device_op_poll,
948 .release = fw_device_op_release,
949 .mmap = fw_device_op_mmap,
950
951#ifdef CONFIG_COMPAT
952 .compat_ioctl = fw_device_op_compat_ioctl,
953#endif
954};
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-11 18:26:13 -0500