/*
* kd.c - KDGHWCLK stuff, possibly m68k only, likely to be deprecated
*/
#include "hwclock.h"
#ifdef __m68k__
# include <fcntl.h>
# include <sysexits.h>
# include <sys/ioctl.h>
# include <unistd.h>
# include "nls.h"
/* Get defines for KDGHWCLK and KDSHWCLK (m68k) */
# include <linux/kd.h>
/* Even on m68k, if KDGHWCLK (antique) is not defined, don't build this */
#endif
#if !defined(__m68k__) || !defined(KDGHWCLK)
#include <stddef.h>
struct clock_ops *probe_for_kd_clock(void)
{
return NULL;
}
#else /* __m68k__ && KDGHWCLK */
/* Opened by probe_for_kd_clock(), and never closed. */
static int con_fd = -1;
static char *con_fd_filename; /* usually "/dev/tty1" */
/*
* Wait for the top of a clock tick by calling KDGHWCLK in a busy loop until
* we see it.
*/
static int synchronize_to_clock_tick_kd(void)
{
/* The time when we were called (and started waiting) */
struct hwclk_time start_time, nowtime;
struct timeval begin, now;
if (debug)
printf(_("Waiting in loop for time from KDGHWCLK to change\n"));
if (ioctl(con_fd, KDGHWCLK, &start_time) == -1) {
warn(_("KDGHWCLK ioctl to read time failed"));
return 3;
}
/*
* Wait for change. Should be within a second, but in case something
* weird happens, we have a time limit (1.5s) on this loop to reduce
* the impact of this failure.
*/
gettimeofday(&begin, NULL);
do {
/*
* Added by Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de>
*
* "The culprit is the fast loop with KDGHWCLK ioctls. It
* seems the kernel gets confused by those on Amigas with
* A2000 RTCs and simply hangs after some time. Inserting a
* sleep helps."
*/
xusleep(1);
if (ioctl(con_fd, KDGHWCLK, &nowtime) == -1) {
warn(_("KDGHWCLK ioctl to read time failed in loop"));
return 3;
}
if (start_time.tm_sec != nowtime.tm_sec)
break;
gettimeofday(&now, NULL);
if (time_diff(now, begin) > 1.5) {
warnx(_("Timed out waiting for time change."));
return 2;
}
} while (1);
return 0;
}
/*
* Read the hardware clock and return the current time via <tm> argument.
* Use ioctls to /dev/tty1 on what we assume is an m68k machine.
*
* Note that we don't use /dev/console here. That might be a serial console.
*/
static int read_hardware_clock_kd(struct tm *tm)
{
struct hwclk_time t;
if (ioctl(con_fd, KDGHWCLK, &t) == -1) {
warn(_("ioctl() failed to read time from %s"),
con_fd_filename);
hwclock_exit(EX_IOERR);
}
tm->tm_sec = t.sec;
tm->tm_min = t.min;
tm->tm_hour = t.hour;
tm->tm_mday = t.day;
tm->tm_mon = t.mon;
tm->tm_year = t.year;
tm->tm_wday = t.wday;
tm->tm_isdst = -1; /* Don't know if it's Daylight Savings Time */
return 0;
}
/*
* Set the Hardware Clock to the time <new_broken_time>. Use ioctls to
* /dev/tty1 on what we assume is an m68k machine.
*
* Note that we don't use /dev/console here. That might be a serial console.
*/
static int set_hardware_clock_kd(const struct tm *new_broken_time)
{
struct hwclk_time t;
t.sec = new_broken_time->tm_sec;
t.min = new_broken_time->tm_min;
t.hour = new_broken_time->tm_hour;
t.day = new_broken_time->tm_mday;
t.mon = new_broken_time->tm_mon;
t.year = new_broken_time->tm_year;
t.wday = new_broken_time->tm_wday;
if (ioctl(con_fd, KDSHWCLK, &t) == -1) {
warn(_("ioctl KDSHWCLK failed"));
hwclock_exit(EX_IOERR);
}
return 0;
}
static int get_permissions_kd(void)
{
return 0;
}
static struct clock_ops kd = {
N_("Using the KDGHWCLK interface to m68k clock."),
get_permissions_kd,
read_hardware_clock_kd,
set_hardware_clock_kd,
synchronize_to_clock_tick_kd,
};
/* return &kd if KDGHWCLK works, NULL otherwise */
struct clock_ops *probe_for_kd_clock()
{
struct clock_ops *ret = NULL;
struct hwclk_time t;
if (con_fd < 0) { /* first time here */
con_fd_filename = "/dev/tty1";
con_fd = open(con_fd_filename, O_RDONLY);
}
if (con_fd < 0) {
/* perhaps they are using devfs? */
con_fd_filename = "/dev/vc/1";
con_fd = open(con_fd_filename, O_RDONLY);
}
if (con_fd < 0) {
/* probably KDGHWCLK exists on m68k only */
warn(_("Can't open /dev/tty1 or /dev/vc/1"));
} else {
if (ioctl(con_fd, KDGHWCLK, &t) == -1) {
if (errno != EINVAL)
warn(_("KDGHWCLK ioctl failed"));
} else
ret = &kd;
}
return ret;
}
#endif /* __m68k__ && KDGHWCLK */
