| blob | 520ecf86cbb37b00bc7ec893bac4843b452fdeed |
1 /*
2 * Char device interface.
3 *
4 * Copyright (C) 2005-2006 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 */
21 #ifndef _LINUX_FIREWIRE_CDEV_H
22 #define _LINUX_FIREWIRE_CDEV_H
24 #include <linux/ioctl.h>
25 #include <linux/types.h>
26 #include <linux/firewire-constants.h>
28 #define FW_CDEV_EVENT_BUS_RESET 0x00
29 #define FW_CDEV_EVENT_RESPONSE 0x01
30 #define FW_CDEV_EVENT_REQUEST 0x02
31 #define FW_CDEV_EVENT_ISO_INTERRUPT 0x03
32 #define FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED 0x04
33 #define FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED 0x05
35 /**
36 * struct fw_cdev_event_common - Common part of all fw_cdev_event_ types
37 * @closure: For arbitrary use by userspace
38 * @type: Discriminates the fw_cdev_event_ types
39 *
40 * This struct may be used to access generic members of all fw_cdev_event_
41 * types regardless of the specific type.
42 *
43 * Data passed in the @closure field for a request will be returned in the
44 * corresponding event. It is big enough to hold a pointer on all platforms.
45 * The ioctl used to set @closure depends on the @type of event.
46 */
48 __u64 closure;
49 __u32 type;
50 };
52 /**
53 * struct fw_cdev_event_bus_reset - Sent when a bus reset occurred
54 * @closure: See &fw_cdev_event_common; set by %FW_CDEV_IOC_GET_INFO ioctl
55 * @type: See &fw_cdev_event_common; always %FW_CDEV_EVENT_BUS_RESET
56 * @node_id: New node ID of this node
57 * @local_node_id: Node ID of the local node, i.e. of the controller
58 * @bm_node_id: Node ID of the bus manager
59 * @irm_node_id: Node ID of the iso resource manager
60 * @root_node_id: Node ID of the root node
61 * @generation: New bus generation
62 *
63 * This event is sent when the bus the device belongs to goes through a bus
64 * reset. It provides information about the new bus configuration, such as
65 * new node ID for this device, new root ID, and others.
66 */
68 __u64 closure;
69 __u32 type;
70 __u32 node_id;
71 __u32 local_node_id;
72 __u32 bm_node_id;
73 __u32 irm_node_id;
74 __u32 root_node_id;
75 __u32 generation;
76 };
78 /**
79 * struct fw_cdev_event_response - Sent when a response packet was received
80 * @closure: See &fw_cdev_event_common;
81 * set by %FW_CDEV_IOC_SEND_REQUEST ioctl
82 * @type: See &fw_cdev_event_common; always %FW_CDEV_EVENT_RESPONSE
83 * @rcode: Response code returned by the remote node
84 * @length: Data length, i.e. the response's payload size in bytes
85 * @data: Payload data, if any
86 *
87 * This event is sent when the stack receives a response to an outgoing request
88 * sent by %FW_CDEV_IOC_SEND_REQUEST ioctl. The payload data for responses
89 * carrying data (read and lock responses) follows immediately and can be
90 * accessed through the @data field.
91 */
93 __u64 closure;
94 __u32 type;
95 __u32 rcode;
96 __u32 length;
98 };
100 /**
101 * struct fw_cdev_event_request - Sent on incoming request to an address region
102 * @closure: See &fw_cdev_event_common; set by %FW_CDEV_IOC_ALLOCATE ioctl
103 * @type: See &fw_cdev_event_common; always %FW_CDEV_EVENT_REQUEST
104 * @tcode: Transaction code of the incoming request
105 * @offset: The offset into the 48-bit per-node address space
106 * @handle: Reference to the kernel-side pending request
107 * @length: Data length, i.e. the request's payload size in bytes
108 * @data: Incoming data, if any
109 *
110 * This event is sent when the stack receives an incoming request to an address
111 * region registered using the %FW_CDEV_IOC_ALLOCATE ioctl. The request is
112 * guaranteed to be completely contained in the specified region. Userspace is
113 * responsible for sending the response by %FW_CDEV_IOC_SEND_RESPONSE ioctl,
114 * using the same @handle.
115 *
116 * The payload data for requests carrying data (write and lock requests)
117 * follows immediately and can be accessed through the @data field.
118 */
120 __u64 closure;
121 __u32 type;
122 __u32 tcode;
123 __u64 offset;
124 __u32 handle;
125 __u32 length;
127 };
129 /**
130 * struct fw_cdev_event_iso_interrupt - Sent when an iso packet was completed
131 * @closure: See &fw_cdev_event_common;
132 * set by %FW_CDEV_CREATE_ISO_CONTEXT ioctl
133 * @type: See &fw_cdev_event_common; always %FW_CDEV_EVENT_ISO_INTERRUPT
134 * @cycle: Cycle counter of the interrupt packet
135 * @header_length: Total length of following headers, in bytes
136 * @header: Stripped headers, if any
137 *
138 * This event is sent when the controller has completed an &fw_cdev_iso_packet
139 * with the %FW_CDEV_ISO_INTERRUPT bit set. In the receive case, the headers
140 * stripped of all packets up until and including the interrupt packet are
141 * returned in the @header field. The amount of header data per packet is as
142 * specified at iso context creation by &fw_cdev_create_iso_context.header_size.
143 *
144 * In version 1 of this ABI, header data consisted of the 1394 isochronous
145 * packet header, followed by quadlets from the packet payload if
146 * &fw_cdev_create_iso_context.header_size > 4.
147 *
148 * In version 2 of this ABI, header data consist of the 1394 isochronous
149 * packet header, followed by a timestamp quadlet if
150 * &fw_cdev_create_iso_context.header_size > 4, followed by quadlets from the
151 * packet payload if &fw_cdev_create_iso_context.header_size > 8.
152 *
153 * Behaviour of ver. 1 of this ABI is no longer available since ABI ver. 2.
154 *
155 * Format of 1394 iso packet header: 16 bits len, 2 bits tag, 6 bits channel,
156 * 4 bits tcode, 4 bits sy, in big endian byte order. Format of timestamp:
157 * 16 bits invalid, 3 bits cycleSeconds, 13 bits cycleCount, in big endian byte
158 * order.
159 */
161 __u64 closure;
162 __u32 type;
163 __u32 cycle;
164 __u32 header_length;
166 };
168 /**
169 * struct fw_cdev_event_iso_resource - Iso resources were allocated or freed
170 * @closure: See &fw_cdev_event_common;
171 * set by %FW_CDEV_IOC_(DE)ALLOCATE_ISO_RESOURCE(_ONCE) ioctl
172 * @type: %FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED or
173 * %FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED
174 * @handle: Reference by which an allocated resource can be deallocated
175 * @channel: Isochronous channel which was (de)allocated, if any
176 * @bandwidth: Bandwidth allocation units which were (de)allocated, if any
177 *
178 * An %FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED event is sent after an isochronous
179 * resource was allocated at the IRM. The client has to check @channel and
180 * @bandwidth for whether the allocation actually succeeded.
181 *
182 * An %FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED event is sent after an isochronous
183 * resource was deallocated at the IRM. It is also sent when automatic
184 * reallocation after a bus reset failed.
185 *
186 * @channel is <0 if no channel was (de)allocated or if reallocation failed.
187 * @bandwidth is 0 if no bandwidth was (de)allocated or if reallocation failed.
188 */
190 __u64 closure;
191 __u32 type;
192 __u32 handle;
193 __s32 channel;
194 __s32 bandwidth;
195 };
197 /**
198 * union fw_cdev_event - Convenience union of fw_cdev_event_ types
199 * @common: Valid for all types
200 * @bus_reset: Valid if @common.type == %FW_CDEV_EVENT_BUS_RESET
201 * @response: Valid if @common.type == %FW_CDEV_EVENT_RESPONSE
202 * @request: Valid if @common.type == %FW_CDEV_EVENT_REQUEST
203 * @iso_interrupt: Valid if @common.type == %FW_CDEV_EVENT_ISO_INTERRUPT
204 * @iso_resource: Valid if @common.type ==
205 * %FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED or
206 * %FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED
207 *
208 * Convenience union for userspace use. Events could be read(2) into an
209 * appropriately aligned char buffer and then cast to this union for further
210 * processing. Note that for a request, response or iso_interrupt event,
211 * the data[] or header[] may make the size of the full event larger than
212 * sizeof(union fw_cdev_event). Also note that if you attempt to read(2)
213 * an event into a buffer that is not large enough for it, the data that does
214 * not fit will be discarded so that the next read(2) will return a new event.
215 */
223 };
225 /* available since kernel version 2.6.22 */
239 /* available since kernel version 2.6.24 */
242 /* available since kernel version 2.6.30 */
243 #define FW_CDEV_IOC_ALLOCATE_ISO_RESOURCE _IOWR('#', 0x0d, struct fw_cdev_allocate_iso_resource)
245 #define FW_CDEV_IOC_ALLOCATE_ISO_RESOURCE_ONCE _IOW('#', 0x0f, struct fw_cdev_allocate_iso_resource)
246 #define FW_CDEV_IOC_DEALLOCATE_ISO_RESOURCE_ONCE _IOW('#', 0x10, struct fw_cdev_allocate_iso_resource)
251 /*
252 * FW_CDEV_VERSION History
253 * 1 (2.6.22) - initial version
254 * 2 (2.6.30) - changed &fw_cdev_event_iso_interrupt.header if
255 * &fw_cdev_create_iso_context.header_size is 8 or more
256 */
257 #define FW_CDEV_VERSION 2
259 /**
260 * struct fw_cdev_get_info - General purpose information ioctl
261 * @version: The version field is just a running serial number.
262 * We never break backwards compatibility, but may add more
263 * structs and ioctls in later revisions.
264 * @rom_length: If @rom is non-zero, at most rom_length bytes of configuration
265 * ROM will be copied into that user space address. In either
266 * case, @rom_length is updated with the actual length of the
267 * configuration ROM.
268 * @rom: If non-zero, address of a buffer to be filled by a copy of the
269 * device's configuration ROM
270 * @bus_reset: If non-zero, address of a buffer to be filled by a
271 * &struct fw_cdev_event_bus_reset with the current state
272 * of the bus. This does not cause a bus reset to happen.
273 * @bus_reset_closure: Value of &closure in this and subsequent bus reset events
274 * @card: The index of the card this device belongs to
275 */
277 __u32 version;
278 __u32 rom_length;
279 __u64 rom;
280 __u64 bus_reset;
281 __u64 bus_reset_closure;
282 __u32 card;
283 };
285 /**
286 * struct fw_cdev_send_request - Send an asynchronous request packet
287 * @tcode: Transaction code of the request
288 * @length: Length of outgoing payload, in bytes
289 * @offset: 48-bit offset at destination node
290 * @closure: Passed back to userspace in the response event
291 * @data: Userspace pointer to payload
292 * @generation: The bus generation where packet is valid
293 *
294 * Send a request to the device. This ioctl implements all outgoing requests.
295 * Both quadlet and block request specify the payload as a pointer to the data
296 * in the @data field. Once the transaction completes, the kernel writes an
297 * &fw_cdev_event_response event back. The @closure field is passed back to
298 * user space in the response event.
299 */
301 __u32 tcode;
302 __u32 length;
303 __u64 offset;
304 __u64 closure;
305 __u64 data;
306 __u32 generation;
307 };
309 /**
310 * struct fw_cdev_send_response - Send an asynchronous response packet
311 * @rcode: Response code as determined by the userspace handler
312 * @length: Length of outgoing payload, in bytes
313 * @data: Userspace pointer to payload
314 * @handle: The handle from the &fw_cdev_event_request
315 *
316 * Send a response to an incoming request. By setting up an address range using
317 * the %FW_CDEV_IOC_ALLOCATE ioctl, userspace can listen for incoming requests. An
318 * incoming request will generate an %FW_CDEV_EVENT_REQUEST, and userspace must
319 * send a reply using this ioctl. The event has a handle to the kernel-side
320 * pending transaction, which should be used with this ioctl.
321 */
323 __u32 rcode;
324 __u32 length;
325 __u64 data;
326 __u32 handle;
327 };
329 /**
330 * struct fw_cdev_allocate - Allocate a CSR address range
331 * @offset: Start offset of the address range
332 * @closure: To be passed back to userspace in request events
333 * @length: Length of the address range, in bytes
334 * @handle: Handle to the allocation, written by the kernel
335 *
336 * Allocate an address range in the 48-bit address space on the local node
337 * (the controller). This allows userspace to listen for requests with an
338 * offset within that address range. When the kernel receives a request
339 * within the range, an &fw_cdev_event_request event will be written back.
340 * The @closure field is passed back to userspace in the response event.
341 * The @handle field is an out parameter, returning a handle to the allocated
342 * range to be used for later deallocation of the range.
343 *
344 * The address range is allocated on all local nodes. The address allocation
345 * is exclusive except for the FCP command and response registers.
346 */
348 __u64 offset;
349 __u64 closure;
350 __u32 length;
351 __u32 handle;
352 };
354 /**
355 * struct fw_cdev_deallocate - Free a CSR address range or isochronous resource
356 * @handle: Handle to the address range or iso resource, as returned by the
357 * kernel when the range or resource was allocated
358 */
360 __u32 handle;
361 };
363 #define FW_CDEV_LONG_RESET 0
364 #define FW_CDEV_SHORT_RESET 1
366 /**
367 * struct fw_cdev_initiate_bus_reset - Initiate a bus reset
368 * @type: %FW_CDEV_SHORT_RESET or %FW_CDEV_LONG_RESET
369 *
370 * Initiate a bus reset for the bus this device is on. The bus reset can be
371 * either the original (long) bus reset or the arbitrated (short) bus reset
372 * introduced in 1394a-2000.
373 */
376 };
378 /**
379 * struct fw_cdev_add_descriptor - Add contents to the local node's config ROM
380 * @immediate: If non-zero, immediate key to insert before pointer
381 * @key: Upper 8 bits of root directory pointer
382 * @data: Userspace pointer to contents of descriptor block
383 * @length: Length of descriptor block data, in quadlets
384 * @handle: Handle to the descriptor, written by the kernel
385 *
386 * Add a descriptor block and optionally a preceding immediate key to the local
387 * node's configuration ROM.
388 *
389 * The @key field specifies the upper 8 bits of the descriptor root directory
390 * pointer and the @data and @length fields specify the contents. The @key
391 * should be of the form 0xXX000000. The offset part of the root directory entry
392 * will be filled in by the kernel.
393 *
394 * If not 0, the @immediate field specifies an immediate key which will be
395 * inserted before the root directory pointer.
396 *
397 * @immediate, @key, and @data array elements are CPU-endian quadlets.
398 *
399 * If successful, the kernel adds the descriptor and writes back a handle to the
400 * kernel-side object to be used for later removal of the descriptor block and
401 * immediate key.
402 *
403 * This ioctl affects the configuration ROMs of all local nodes.
404 * The ioctl only succeeds on device files which represent a local node.
405 */
407 __u32 immediate;
408 __u32 key;
409 __u64 data;
410 __u32 length;
411 __u32 handle;
412 };
414 /**
415 * struct fw_cdev_remove_descriptor - Remove contents from the configuration ROM
416 * @handle: Handle to the descriptor, as returned by the kernel when the
417 * descriptor was added
418 *
419 * Remove a descriptor block and accompanying immediate key from the local
420 * nodes' configuration ROMs.
421 */
423 __u32 handle;
424 };
426 #define FW_CDEV_ISO_CONTEXT_TRANSMIT 0
427 #define FW_CDEV_ISO_CONTEXT_RECEIVE 1
429 /**
430 * struct fw_cdev_create_iso_context - Create a context for isochronous IO
431 * @type: %FW_CDEV_ISO_CONTEXT_TRANSMIT or %FW_CDEV_ISO_CONTEXT_RECEIVE
432 * @header_size: Header size to strip for receive contexts
433 * @channel: Channel to bind to
434 * @speed: Speed to transmit at
435 * @closure: To be returned in &fw_cdev_event_iso_interrupt
436 * @handle: Handle to context, written back by kernel
437 *
438 * Prior to sending or receiving isochronous I/O, a context must be created.
439 * The context records information about the transmit or receive configuration
440 * and typically maps to an underlying hardware resource. A context is set up
441 * for either sending or receiving. It is bound to a specific isochronous
442 * channel.
443 *
444 * If a context was successfully created, the kernel writes back a handle to the
445 * context, which must be passed in for subsequent operations on that context.
446 *
447 * Note that the effect of a @header_size > 4 depends on
448 * &fw_cdev_get_info.version, as documented at &fw_cdev_event_iso_interrupt.
449 */
451 __u32 type;
452 __u32 header_size;
453 __u32 channel;
454 __u32 speed;
455 __u64 closure;
456 __u32 handle;
457 };
459 #define FW_CDEV_ISO_PAYLOAD_LENGTH(v) (v)
460 #define FW_CDEV_ISO_INTERRUPT (1 << 16)
461 #define FW_CDEV_ISO_SKIP (1 << 17)
462 #define FW_CDEV_ISO_SYNC (1 << 17)
463 #define FW_CDEV_ISO_TAG(v) ((v) << 18)
464 #define FW_CDEV_ISO_SY(v) ((v) << 20)
465 #define FW_CDEV_ISO_HEADER_LENGTH(v) ((v) << 24)
467 /**
468 * struct fw_cdev_iso_packet - Isochronous packet
469 * @control: Contains the header length (8 uppermost bits), the sy field
470 * (4 bits), the tag field (2 bits), a sync flag (1 bit),
471 * a skip flag (1 bit), an interrupt flag (1 bit), and the
472 * payload length (16 lowermost bits)
473 * @header: Header and payload
474 *
475 * &struct fw_cdev_iso_packet is used to describe isochronous packet queues.
476 *
477 * Use the FW_CDEV_ISO_ macros to fill in @control. The sy and tag fields are
478 * specified by IEEE 1394a and IEC 61883.
479 *
480 * FIXME - finish this documentation
481 */
483 __u32 control;
485 };
487 /**
488 * struct fw_cdev_queue_iso - Queue isochronous packets for I/O
489 * @packets: Userspace pointer to packet data
490 * @data: Pointer into mmap()'ed payload buffer
491 * @size: Size of packet data in bytes
492 * @handle: Isochronous context handle
493 *
494 * Queue a number of isochronous packets for reception or transmission.
495 * This ioctl takes a pointer to an array of &fw_cdev_iso_packet structs,
496 * which describe how to transmit from or receive into a contiguous region
497 * of a mmap()'ed payload buffer. As part of the packet descriptors,
498 * a series of headers can be supplied, which will be prepended to the
499 * payload during DMA.
500 *
501 * The kernel may or may not queue all packets, but will write back updated
502 * values of the @packets, @data and @size fields, so the ioctl can be
503 * resubmitted easily.
504 */
506 __u64 packets;
507 __u64 data;
508 __u32 size;
509 __u32 handle;
510 };
512 #define FW_CDEV_ISO_CONTEXT_MATCH_TAG0 1
513 #define FW_CDEV_ISO_CONTEXT_MATCH_TAG1 2
514 #define FW_CDEV_ISO_CONTEXT_MATCH_TAG2 4
515 #define FW_CDEV_ISO_CONTEXT_MATCH_TAG3 8
516 #define FW_CDEV_ISO_CONTEXT_MATCH_ALL_TAGS 15
518 /**
519 * struct fw_cdev_start_iso - Start an isochronous transmission or reception
520 * @cycle: Cycle in which to start I/O. If @cycle is greater than or
521 * equal to 0, the I/O will start on that cycle.
522 * @sync: Determines the value to wait for for receive packets that have
523 * the %FW_CDEV_ISO_SYNC bit set
524 * @tags: Tag filter bit mask. Only valid for isochronous reception.
525 * Determines the tag values for which packets will be accepted.
526 * Use FW_CDEV_ISO_CONTEXT_MATCH_ macros to set @tags.
527 * @handle: Isochronous context handle within which to transmit or receive
528 */
530 __s32 cycle;
531 __u32 sync;
532 __u32 tags;
533 __u32 handle;
534 };
536 /**
537 * struct fw_cdev_stop_iso - Stop an isochronous transmission or reception
538 * @handle: Handle of isochronous context to stop
539 */
541 __u32 handle;
542 };
544 /**
545 * struct fw_cdev_get_cycle_timer - read cycle timer register
546 * @local_time: system time, in microseconds since the Epoch
547 * @cycle_timer: isochronous cycle timer, as per OHCI 1.1 clause 5.13
548 *
549 * The %FW_CDEV_IOC_GET_CYCLE_TIMER ioctl reads the isochronous cycle timer
550 * and also the system clock. This allows to express the receive time of an
551 * isochronous packet as a system time with microsecond accuracy.
552 *
553 * @cycle_timer consists of 7 bits cycleSeconds, 13 bits cycleCount, and
554 * 12 bits cycleOffset, in host byte order.
555 */
557 __u64 local_time;
558 __u32 cycle_timer;
559 };
561 /**
562 * struct fw_cdev_allocate_iso_resource - (De)allocate a channel or bandwidth
563 * @closure: Passed back to userspace in correponding iso resource events
564 * @channels: Isochronous channels of which one is to be (de)allocated
565 * @bandwidth: Isochronous bandwidth units to be (de)allocated
566 * @handle: Handle to the allocation, written by the kernel (only valid in
567 * case of %FW_CDEV_IOC_ALLOCATE_ISO_RESOURCE ioctls)
568 *
569 * The %FW_CDEV_IOC_ALLOCATE_ISO_RESOURCE ioctl initiates allocation of an
570 * isochronous channel and/or of isochronous bandwidth at the isochronous
571 * resource manager (IRM). Only one of the channels specified in @channels is
572 * allocated. An %FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED is sent after
573 * communication with the IRM, indicating success or failure in the event data.
574 * The kernel will automatically reallocate the resources after bus resets.
575 * Should a reallocation fail, an %FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED event
576 * will be sent. The kernel will also automatically deallocate the resources
577 * when the file descriptor is closed.
578 *
579 * The %FW_CDEV_IOC_DEALLOCATE_ISO_RESOURCE ioctl can be used to initiate
580 * deallocation of resources which were allocated as described above.
581 * An %FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED event concludes this operation.
582 *
583 * The %FW_CDEV_IOC_ALLOCATE_ISO_RESOURCE_ONCE ioctl is a variant of allocation
584 * without automatic re- or deallocation.
585 * An %FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED event concludes this operation,
586 * indicating success or failure in its data.
587 *
588 * The %FW_CDEV_IOC_DEALLOCATE_ISO_RESOURCE_ONCE ioctl works like
589 * %FW_CDEV_IOC_ALLOCATE_ISO_RESOURCE_ONCE except that resources are freed
590 * instead of allocated.
591 * An %FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED event concludes this operation.
592 *
593 * To summarize, %FW_CDEV_IOC_DEALLOCATE_ISO_RESOURCE allocates iso resources
594 * for the lifetime of the fd or handle.
595 * In contrast, %FW_CDEV_IOC_ALLOCATE_ISO_RESOURCE_ONCE allocates iso resources
596 * for the duration of a bus generation.
597 *
598 * @channels is a host-endian bitfield with the least significant bit
599 * representing channel 0 and the most significant bit representing channel 63:
600 * 1ULL << c for each channel c that is a candidate for (de)allocation.
601 *
602 * @bandwidth is expressed in bandwidth allocation units, i.e. the time to send
603 * one quadlet of data (payload or header data) at speed S1600.
604 */
606 __u64 closure;
607 __u64 channels;
608 __u32 bandwidth;
609 __u32 handle;
610 };
612 /**
613 * struct fw_cdev_send_stream_packet - send an asynchronous stream packet
614 * @length: Length of outgoing payload, in bytes
615 * @tag: Data format tag
616 * @channel: Isochronous channel to transmit to
617 * @sy: Synchronization code
618 * @closure: Passed back to userspace in the response event
619 * @data: Userspace pointer to payload
620 * @generation: The bus generation where packet is valid
621 * @speed: Speed to transmit at
622 *
623 * The %FW_CDEV_IOC_SEND_STREAM_PACKET ioctl sends an asynchronous stream packet
624 * to every device which is listening to the specified channel. The kernel
625 * writes an &fw_cdev_event_response event which indicates success or failure of
626 * the transmission.
627 */
629 __u32 length;
630 __u32 tag;
631 __u32 channel;
632 __u32 sy;
633 __u64 closure;
634 __u64 data;
635 __u32 generation;
636 __u32 speed;
637 };