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authorStefan Richter <stefanr@s5r6.in-berlin.de>2006-07-03 12:02:28 -0400
committerBen Collins <bcollins@ubuntu.com>2006-07-03 12:02:28 -0400
commite1d118f16dca0f54faba3e8dd5b6adbbf7ac68c8 (patch)
treefffc9d2b1fbe3fe6bb55758e2a6951ad9c581e63 /drivers/ieee1394/iso.h
parent2b01b80b944b3abf623c8acc2b5537a85b5ebd3c (diff)
[PATCH] ieee1394: coding style and comment fixes in midlayer header files
Adjust tabulators, line wraps, empty lines, and comment style. Update comments in ieee1394_transactions.h and highlevel.h. Fix typo in comment in csr.h. Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> Signed-off-by: Ben Collins <bcollins@ubuntu.com>
Diffstat (limited to 'drivers/ieee1394/iso.h')
-rw-r--r--drivers/ieee1394/iso.h80
1 files changed, 43 insertions, 37 deletions
diff --git a/drivers/ieee1394/iso.h b/drivers/ieee1394/iso.h
index 3efc60b33a8..ed639c4c510 100644
--- a/drivers/ieee1394/iso.h
+++ b/drivers/ieee1394/iso.h
@@ -17,28 +17,30 @@
17 17
18/* high-level ISO interface */ 18/* high-level ISO interface */
19 19
20/* This API sends and receives isochronous packets on a large, 20/*
21 virtually-contiguous kernel memory buffer. The buffer may be mapped 21 * This API sends and receives isochronous packets on a large,
22 into a user-space process for zero-copy transmission and reception. 22 * virtually-contiguous kernel memory buffer. The buffer may be mapped
23 23 * into a user-space process for zero-copy transmission and reception.
24 There are no explicit boundaries between packets in the buffer. A 24 *
25 packet may be transmitted or received at any location. However, 25 * There are no explicit boundaries between packets in the buffer. A
26 low-level drivers may impose certain restrictions on alignment or 26 * packet may be transmitted or received at any location. However,
27 size of packets. (e.g. in OHCI no packet may cross a page boundary, 27 * low-level drivers may impose certain restrictions on alignment or
28 and packets should be quadlet-aligned) 28 * size of packets. (e.g. in OHCI no packet may cross a page boundary,
29*/ 29 * and packets should be quadlet-aligned)
30 */
30 31
31/* Packet descriptor - the API maintains a ring buffer of these packet 32/* Packet descriptor - the API maintains a ring buffer of these packet
32 descriptors in kernel memory (hpsb_iso.infos[]). */ 33 * descriptors in kernel memory (hpsb_iso.infos[]). */
33
34struct hpsb_iso_packet_info { 34struct hpsb_iso_packet_info {
35 /* offset of data payload relative to the first byte of the buffer */ 35 /* offset of data payload relative to the first byte of the buffer */
36 __u32 offset; 36 __u32 offset;
37 37
38 /* length of the data payload, in bytes (not including the isochronous header) */ 38 /* length of the data payload, in bytes (not including the isochronous
39 * header) */
39 __u16 len; 40 __u16 len;
40 41
41 /* (recv only) the cycle number (mod 8000) on which the packet was received */ 42 /* (recv only) the cycle number (mod 8000) on which the packet was
43 * received */
42 __u16 cycle; 44 __u16 cycle;
43 45
44 /* (recv only) channel on which the packet was received */ 46 /* (recv only) channel on which the packet was received */
@@ -48,12 +50,10 @@ struct hpsb_iso_packet_info {
48 __u8 tag; 50 __u8 tag;
49 __u8 sy; 51 __u8 sy;
50 52
51 /* 53 /* length in bytes of the packet including header/trailer.
52 * length in bytes of the packet including header/trailer. 54 * MUST be at structure end, since the first part of this structure is
53 * MUST be at structure end, since the first part of this structure is also 55 * also defined in raw1394.h (i.e. struct raw1394_iso_packet_info), is
54 * defined in raw1394.h (i.e. struct raw1394_iso_packet_info), is copied to 56 * copied to userspace and is accessed there through libraw1394. */
55 * userspace and is accessed there through libraw1394.
56 */
57 __u16 total_len; 57 __u16 total_len;
58}; 58};
59 59
@@ -75,8 +75,8 @@ struct hpsb_iso {
75 void *hostdata; 75 void *hostdata;
76 76
77 /* a function to be called (from interrupt context) after 77 /* a function to be called (from interrupt context) after
78 outgoing packets have been sent, or incoming packets have 78 * outgoing packets have been sent, or incoming packets have
79 arrived */ 79 * arrived */
80 void (*callback)(struct hpsb_iso*); 80 void (*callback)(struct hpsb_iso*);
81 81
82 /* wait for buffer space */ 82 /* wait for buffer space */
@@ -88,7 +88,7 @@ struct hpsb_iso {
88 88
89 89
90 /* greatest # of packets between interrupts - controls 90 /* greatest # of packets between interrupts - controls
91 the maximum latency of the buffer */ 91 * the maximum latency of the buffer */
92 int irq_interval; 92 int irq_interval;
93 93
94 /* the buffer for packet data payloads */ 94 /* the buffer for packet data payloads */
@@ -112,8 +112,8 @@ struct hpsb_iso {
112 int pkt_dma; 112 int pkt_dma;
113 113
114 /* how many packets, starting at first_packet: 114 /* how many packets, starting at first_packet:
115 (transmit) are ready to be filled with data 115 * (transmit) are ready to be filled with data
116 (receive) contain received data */ 116 * (receive) contain received data */
117 int n_ready_packets; 117 int n_ready_packets;
118 118
119 /* how many times the buffer has overflowed or underflowed */ 119 /* how many times the buffer has overflowed or underflowed */
@@ -134,7 +134,7 @@ struct hpsb_iso {
134 int start_cycle; 134 int start_cycle;
135 135
136 /* cycle at which next packet will be transmitted, 136 /* cycle at which next packet will be transmitted,
137 -1 if not known */ 137 * -1 if not known */
138 int xmit_cycle; 138 int xmit_cycle;
139 139
140 /* ringbuffer of packet descriptors in regular kernel memory 140 /* ringbuffer of packet descriptors in regular kernel memory
@@ -170,25 +170,30 @@ int hpsb_iso_recv_unlisten_channel(struct hpsb_iso *iso, unsigned char channel);
170int hpsb_iso_recv_set_channel_mask(struct hpsb_iso *iso, u64 mask); 170int hpsb_iso_recv_set_channel_mask(struct hpsb_iso *iso, u64 mask);
171 171
172/* start/stop DMA */ 172/* start/stop DMA */
173int hpsb_iso_xmit_start(struct hpsb_iso *iso, int start_on_cycle, int prebuffer); 173int hpsb_iso_xmit_start(struct hpsb_iso *iso, int start_on_cycle,
174int hpsb_iso_recv_start(struct hpsb_iso *iso, int start_on_cycle, int tag_mask, int sync); 174 int prebuffer);
175int hpsb_iso_recv_start(struct hpsb_iso *iso, int start_on_cycle,
176 int tag_mask, int sync);
175void hpsb_iso_stop(struct hpsb_iso *iso); 177void hpsb_iso_stop(struct hpsb_iso *iso);
176 178
177/* deallocate buffer and DMA context */ 179/* deallocate buffer and DMA context */
178void hpsb_iso_shutdown(struct hpsb_iso *iso); 180void hpsb_iso_shutdown(struct hpsb_iso *iso);
179 181
180/* queue a packet for transmission. 'offset' is relative to the beginning of the 182/* queue a packet for transmission.
181 DMA buffer, where the packet's data payload should already have been placed */ 183 * 'offset' is relative to the beginning of the DMA buffer, where the packet's
182int hpsb_iso_xmit_queue_packet(struct hpsb_iso *iso, u32 offset, u16 len, u8 tag, u8 sy); 184 * data payload should already have been placed. */
185int hpsb_iso_xmit_queue_packet(struct hpsb_iso *iso, u32 offset, u16 len,
186 u8 tag, u8 sy);
183 187
184/* wait until all queued packets have been transmitted to the bus */ 188/* wait until all queued packets have been transmitted to the bus */
185int hpsb_iso_xmit_sync(struct hpsb_iso *iso); 189int hpsb_iso_xmit_sync(struct hpsb_iso *iso);
186 190
187/* N packets have been read out of the buffer, re-use the buffer space */ 191/* N packets have been read out of the buffer, re-use the buffer space */
188int hpsb_iso_recv_release_packets(struct hpsb_iso *recv, unsigned int n_packets); 192int hpsb_iso_recv_release_packets(struct hpsb_iso *recv,
193 unsigned int n_packets);
189 194
190/* check for arrival of new packets immediately (even if irq_interval 195/* check for arrival of new packets immediately (even if irq_interval
191 has not yet been reached) */ 196 * has not yet been reached) */
192int hpsb_iso_recv_flush(struct hpsb_iso *iso); 197int hpsb_iso_recv_flush(struct hpsb_iso *iso);
193 198
194/* returns # of packets ready to send or receive */ 199/* returns # of packets ready to send or receive */
@@ -197,14 +202,15 @@ int hpsb_iso_n_ready(struct hpsb_iso *iso);
197/* the following are callbacks available to low-level drivers */ 202/* the following are callbacks available to low-level drivers */
198 203
199/* call after a packet has been transmitted to the bus (interrupt context is OK) 204/* call after a packet has been transmitted to the bus (interrupt context is OK)
200 'cycle' is the _exact_ cycle the packet was sent on 205 * 'cycle' is the _exact_ cycle the packet was sent on
201 'error' should be non-zero if some sort of error occurred when sending the packet 206 * 'error' should be non-zero if some sort of error occurred when sending the
202*/ 207 * packet */
203void hpsb_iso_packet_sent(struct hpsb_iso *iso, int cycle, int error); 208void hpsb_iso_packet_sent(struct hpsb_iso *iso, int cycle, int error);
204 209
205/* call after a packet has been received (interrupt context OK) */ 210/* call after a packet has been received (interrupt context OK) */
206void hpsb_iso_packet_received(struct hpsb_iso *iso, u32 offset, u16 len, 211void hpsb_iso_packet_received(struct hpsb_iso *iso, u32 offset, u16 len,
207 u16 total_len, u16 cycle, u8 channel, u8 tag, u8 sy); 212 u16 total_len, u16 cycle, u8 channel, u8 tag,
213 u8 sy);
208 214
209/* call to wake waiting processes after buffer space has opened up. */ 215/* call to wake waiting processes after buffer space has opened up. */
210void hpsb_iso_wake(struct hpsb_iso *iso); 216void hpsb_iso_wake(struct hpsb_iso *iso);