kopia lustrzana https://gitlab.com/sane-project/backends
Added sanei_pp_init() and sanei_pp_udelay().
Gerhard Jaeger
rodzic
e81cfe2818
commit
edfe46590a
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@ -58,6 +58,12 @@ enum sanei_pp_mode {
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SANEI_PP_MODE_ECP = (1<<8)
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};
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/** Initialize sanei_pp.
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*
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* This function must be called before any other sanei_pp function.
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*/
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extern SANE_Status sanei_pp_init( void );
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/**
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* Function to open a parport device.
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*
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@ -115,4 +121,13 @@ extern SANE_Byte sanei_pp_inb_stat( int fd );
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extern SANE_Byte sanei_pp_inb_ctrl( int fd );
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extern SANE_Byte sanei_pp_inb_epp ( int fd );
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/** function to delay execution for some micro-seconds.
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* Please not, that the accuracy highly depends on your system architechture
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* and the time to delay. It is internally implemented as system calls to
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* gettimeofday().
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*
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* @param usec - number of micro-seconds to delay
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*/
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extern void sanei_pp_udelay( unsigned long usec );
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#endif
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138
sanei/sanei_pp.c
138
sanei/sanei_pp.c
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@ -59,6 +59,8 @@
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#define BACKEND_NAME sanei_pp
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#define _TEST_LOOPS 1000
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#ifndef _VAR_NOT_USED
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# define _VAR_NOT_USED(x) ((x)=(x))
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#endif
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@ -73,7 +75,16 @@
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif
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#ifdef HAVE_SYS_TIME_H
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# include <sys/time.h>
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#endif
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#ifdef HAVE_LIMITS_H
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# include <limits.h>
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#else
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# ifndef ULONG_MAX
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# define ULONG_MAX 4294967295UL
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# endif
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#endif
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#if defined (ENABLE_PARPORT_DIRECTIO)
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# undef HAVE_LIBIEEE1284
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# if defined(HAVE_SYS_IO_H)
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@ -135,6 +146,7 @@ inb( u_long port )
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/** our global init flag... */
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static int first_time = SANE_TRUE;
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static unsigned long pp_thresh = 0;
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#if (defined (HAVE_IOPERM) || defined (HAVE_LIBIEEE1284)) && !defined (IO_SUPPORT_MISSING)
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@ -510,6 +522,77 @@ no_ecp:
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}
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#endif
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static unsigned long
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pp_time_diff( struct timeval *start, struct timeval *end )
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{
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double s, e, r;
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s = (double)start->tv_sec * 1000000.0 + (double)start->tv_usec;
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e = (double)end->tv_sec * 1000000.0 + (double)end->tv_usec;
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r = (e - s);
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if( r <= (double)ULONG_MAX )
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return (unsigned long)r;
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return 0;
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}
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/**
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*/
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static unsigned long
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pp_calculate_thresh( void )
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{
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unsigned long i, r;
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struct timeval start, end, deadline;
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gettimeofday( &start, NULL);
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for( i = _TEST_LOOPS; i; i-- ) {
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gettimeofday( &deadline, NULL );
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deadline.tv_usec += 10;
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deadline.tv_sec += deadline.tv_usec / 1000000;
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deadline.tv_usec %= 1000000;
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}
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gettimeofday( &end, NULL);
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r = pp_time_diff( &start, &end );
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return (r/_TEST_LOOPS);
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}
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/**
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*/
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static void
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pp_calibrate_delay( void )
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{
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unsigned long r, i;
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struct timeval start, end;
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for( i = 0; i < 5; i++ ) {
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pp_thresh = pp_calculate_thresh();
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gettimeofday( &start, NULL);
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for( i = _TEST_LOOPS; i; i-- ) {
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sanei_pp_udelay( 1 );
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}
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gettimeofday( &end, NULL);
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r = pp_time_diff( &start, &end );
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DBG( 4, "pp_calibrate_delay: Delay expected: "
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"%u, real %lu, pp_thresh=%lu\n", _TEST_LOOPS, r, pp_thresh );
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if( r >= _TEST_LOOPS ) {
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return;
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}
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}
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DBG( 4, "pp_calibrate_delay: pp_thresh set to 0\n" );
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pp_thresh = 0;
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}
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static SANE_Status
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pp_init( void )
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{
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@ -573,21 +656,15 @@ pp_init( void )
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static int
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pp_open( const char *dev, SANE_Status * status )
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{
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int i, result;
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int i;
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#if !defined (HAVE_LIBIEEE1284)
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u_long base;
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#else
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int result;
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#endif
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DBG( 4, "pp_open: trying to attach dev `%s`\n", dev );
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result = pp_init();
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if( result != SANE_STATUS_GOOD ) {
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DBG( 1, "pp_open: failed to initialize\n" );
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*status = result;
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return -1;
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}
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#if !defined (HAVE_LIBIEEE1284)
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{
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char *end;
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@ -741,6 +818,22 @@ pp_close( int fd, SANE_Status *status )
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/** exported functions **/
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SANE_Status
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sanei_pp_init( void )
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{
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SANE_Status result;
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DBG_INIT();
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result = pp_init();
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if( result != SANE_STATUS_GOOD ) {
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return result;
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}
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pp_calibrate_delay();
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return SANE_STATUS_GOOD;
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}
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SANE_Status
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sanei_pp_open( const char *dev, int *fd )
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{
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@ -993,6 +1086,25 @@ sanei_pp_getmode( int fd, int *mode )
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return SANE_STATUS_GOOD;
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}
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void
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sanei_pp_udelay( unsigned long usec )
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{
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struct timeval now, deadline;
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if( usec <= pp_thresh )
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return;
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gettimeofday( &deadline, NULL );
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deadline.tv_usec += usec;
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deadline.tv_sec += deadline.tv_usec / 1000000;
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deadline.tv_usec %= 1000000;
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do {
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gettimeofday( &now, NULL );
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} while ((now.tv_sec < deadline.tv_sec) ||
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(now.tv_sec == deadline.tv_sec && now.tv_usec < deadline.tv_usec));
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}
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#else /* !HAVE_IOPERM */
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SANE_Status
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@ -1105,4 +1217,10 @@ sanei_pp_getmode( int fd, int *mode )
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return SANE_STATUS_INVAL;
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}
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void
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sanei_pp_udelay( unsigned long usec )
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{
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_VAR_NOT_USED( usesc );
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DBG( 2, "sanei_pp_udelay: not supported\n" );
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}
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#endif /* !HAVE_IOPERM */
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