diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/isdn/hardware/eicon/dqueue.c |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'drivers/isdn/hardware/eicon/dqueue.c')
-rw-r--r-- | drivers/isdn/hardware/eicon/dqueue.c | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/drivers/isdn/hardware/eicon/dqueue.c b/drivers/isdn/hardware/eicon/dqueue.c new file mode 100644 index 000000000000..982258225174 --- /dev/null +++ b/drivers/isdn/hardware/eicon/dqueue.c @@ -0,0 +1,110 @@ +/* $Id: dqueue.c,v 1.5 2003/04/12 21:40:49 schindler Exp $ + * + * Driver for Eicon DIVA Server ISDN cards. + * User Mode IDI Interface + * + * Copyright 2000-2003 by Armin Schindler (mac@melware.de) + * Copyright 2000-2003 Cytronics & Melware (info@melware.de) + * + * This software may be used and distributed according to the terms + * of the GNU General Public License, incorporated herein by reference. + */ + +#include "platform.h" +#include "dqueue.h" + +int +diva_data_q_init(diva_um_idi_data_queue_t * q, + int max_length, int max_segments) +{ + int i; + + q->max_length = max_length; + q->segments = max_segments; + + for (i = 0; i < q->segments; i++) { + q->data[i] = NULL; + q->length[i] = 0; + } + q->read = q->write = q->count = q->segment_pending = 0; + + for (i = 0; i < q->segments; i++) { + if (!(q->data[i] = diva_os_malloc(0, q->max_length))) { + diva_data_q_finit(q); + return (-1); + } + } + + return (0); +} + +int diva_data_q_finit(diva_um_idi_data_queue_t * q) +{ + int i; + + for (i = 0; i < q->segments; i++) { + if (q->data[i]) { + diva_os_free(0, q->data[i]); + } + q->data[i] = NULL; + q->length[i] = 0; + } + q->read = q->write = q->count = q->segment_pending = 0; + + return (0); +} + +int diva_data_q_get_max_length(const diva_um_idi_data_queue_t * q) +{ + return (q->max_length); +} + +void *diva_data_q_get_segment4write(diva_um_idi_data_queue_t * q) +{ + if ((!q->segment_pending) && (q->count < q->segments)) { + q->segment_pending = 1; + return (q->data[q->write]); + } + + return NULL; +} + +void +diva_data_q_ack_segment4write(diva_um_idi_data_queue_t * q, int length) +{ + if (q->segment_pending) { + q->length[q->write] = length; + q->count++; + q->write++; + if (q->write >= q->segments) { + q->write = 0; + } + q->segment_pending = 0; + } +} + +const void *diva_data_q_get_segment4read(const diva_um_idi_data_queue_t * + q) +{ + if (q->count) { + return (q->data[q->read]); + } + return NULL; +} + +int diva_data_q_get_segment_length(const diva_um_idi_data_queue_t * q) +{ + return (q->length[q->read]); +} + +void diva_data_q_ack_segment4read(diva_um_idi_data_queue_t * q) +{ + if (q->count) { + q->length[q->read] = 0; + q->count--; + q->read++; + if (q->read >= q->segments) { + q->read = 0; + } + } +} |