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Diffstat (limited to 'hw/xfree86/common/xisb.c')
| -rw-r--r-- | hw/xfree86/common/xisb.c | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/hw/xfree86/common/xisb.c b/hw/xfree86/common/xisb.c new file mode 100644 index 000000000..4132c7abf --- /dev/null +++ b/hw/xfree86/common/xisb.c @@ -0,0 +1,172 @@ +/* + * Copyright (c) 1997 Metro Link Incorporated + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, + * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF + * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + * + * Except as contained in this notice, the name of the Metro Link shall not be + * used in advertising or otherwise to promote the sale, use or other dealings + * in this Software without prior written authorization from Metro Link. + * + */ +/* $XFree86: xc/programs/Xserver/hw/xfree86/common/xisb.c,v 1.5 2000/11/06 19:24:07 dawes Exp $ */ + +/* + X Input Serial Buffer routines for use in any XInput driver that accesses + a serial device. +*/ + + +/***************************************************************************** + * Standard Headers + ****************************************************************************/ + +#include <misc.h> +#include <xf86.h> +#include <xf86Version.h> +#include <xf86_OSproc.h> +#include <xf86_OSlib.h> +#include <xf86Xinput.h> +#include "xisb.h" + +/***************************************************************************** + * Local Headers + ****************************************************************************/ + +/***************************************************************************** + * Variables without includable headers + ****************************************************************************/ + +/***************************************************************************** + * Local Variables + ****************************************************************************/ + +/***************************************************************************** + * Function Definitions + ****************************************************************************/ + +XISBuffer * +XisbNew (int fd, xf86ssize_t size) +{ + XISBuffer *b; + + b = xalloc (sizeof (XISBuffer)); + if (!b) + return (NULL); + b->buf = xalloc ((sizeof (unsigned char) * size)); + if (!b->buf) + { + xfree (b); + return (NULL); + } + + b->fd = fd; + b->trace = 0; + b->block_duration = 0; + b->current = 1; /* force it to be past the end to trigger initial read */ + b->end = 0; + b->buffer_size = size; + return (b); +} + +void +XisbFree (XISBuffer *b) +{ + xfree (b->buf); + xfree (b); +} + +int +XisbRead (XISBuffer *b) +{ + int ret; + + if (b->current >= b->end) + { + if (b->block_duration >= 0) + { + if (xf86WaitForInput (b->fd, b->block_duration) < 1) + return (-1); + } + else + { + /* + * automatically clear it so if XisbRead is called in a loop + * the next call will make sure there is data with select and + * thus prevent a blocking read + */ + b->block_duration = 0; + } + + ret = xf86ReadSerial (b->fd, b->buf, b->buffer_size); + switch (ret) + { + case 0: + return (-1); /* timeout */ + case -1: + return (-2); /* error */ + default: + b->end = ret; + b->current = 0; + break; + } + } + if (b->trace) + ErrorF ("read 0x%02x (%c)\n", b->buf[b->current], + isprint(b->buf[b->current])?b->buf[b->current]:'.'); + + return (b->buf[b->current++]); +} + +/* the only purpose of this function is to provide output tracing */ +xf86ssize_t +XisbWrite (XISBuffer *b, unsigned char *msg, xf86ssize_t len) +{ + if (b->trace) + { + int i = 0; + for (i = 0; i < len; i++) + ErrorF ("\t\twrote 0x%02x (%c)\n", msg[i], msg[i]); + } + return (xf86WriteSerial (b->fd, msg, len)); +} + +/* turn tracing of this buffer on (1) or off (0) */ +void +XisbTrace (XISBuffer *b, int trace) +{ + b->trace = trace; +} + +/* + * specify a block_duration of -1 when you know the buffer's fd is ready to + * read. After a read, it is automatically set to 0 so that the next read + * will use check to select for data and prevent a block. + * It is the caller's responsibility to set the block_duration to -1 if it + * knows that there is data to read (because the main select loop triggered + * the read) and want's to avoid the unnecessary overhead of the select call + * + * a zero or positive block duration will cause the select to block for the + * give duration in usecs. + */ + +void +XisbBlockDuration (XISBuffer *b, int block_duration) +{ + b->block_duration = block_duration; +} |