/* * 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. * */ /* X Input Serial Buffer routines for use in any XInput driver that accesses a serial device. */ /***************************************************************************** * Standard Headers ****************************************************************************/ #ifdef HAVE_XORG_CONFIG_H #include <xorg-config.h> #endif #include <misc.h> #include <xf86.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, ssize_t size) { XISBuffer *b; b = malloc(sizeof (XISBuffer)); if (!b) return (NULL); b->buf = malloc((sizeof (unsigned char) * size)); if (!b->buf) { free(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) { free(b->buf); free(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 */ ssize_t XisbWrite (XISBuffer *b, unsigned char *msg, ssize_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; }