120 lines
2.3 KiB
C
120 lines
2.3 KiB
C
/*
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* Some real time clocks are embedded within other multi-function chips.
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* Drivers for such chips will implement the RTCDEV protocol and the
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* readclock driver will simply forward on the message to the driver.
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* This keeps things simple for any other services that need to access
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* the RTC as they only have to know / care about the readclock driver.
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*/
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#include <minix/syslib.h>
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#include <minix/drvlib.h>
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#include <minix/sysutil.h>
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#include <minix/log.h>
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#include <minix/rs.h>
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#include <minix/ds.h>
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#include <minix/safecopies.h>
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#include <sys/mman.h>
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#include <sys/types.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <string.h>
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#include <errno.h>
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#include <assert.h>
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#include <time.h>
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#include <lib.h>
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#include "forward.h"
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#include "readclock.h"
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static int fwd_msg(int type, struct tm *t, int t_access, int flags);
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static struct log log = {
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.name = "readclock.fwd",
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.log_level = LEVEL_INFO,
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.log_func = default_log
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};
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/*
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* Label of the driver that messages should be forwarded to.
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*/
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static char *target_label;
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int
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fwd_set_label(char *label)
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{
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target_label = label;
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return OK;
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}
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int
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fwd_init(void)
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{
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if (target_label == NULL) {
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return EINVAL;
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}
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return OK;
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}
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static int
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fwd_msg(int type, struct tm *t, int t_access, int flags)
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{
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int r;
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message m;
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endpoint_t ep;
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cp_grant_id_t gid;
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r = ds_retrieve_label_endpt(target_label, &ep);
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if (r != 0) {
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return -1;
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}
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if (type == RTCDEV_PWR_OFF) {
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/* RTCDEV_PWR_OFF messages don't contain any data/flags. */
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return _syscall(ep, RTCDEV_PWR_OFF, &m);
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}
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gid = cpf_grant_direct(ep, (vir_bytes) t, sizeof(struct tm), t_access);
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if (!GRANT_VALID(gid)) {
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log_warn(&log, "Could not create grant.\n");
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return -1;
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}
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m.m_lc_readclock_rtcdev.grant = gid;
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m.m_lc_readclock_rtcdev.flags = flags;
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r = _syscall(ep, type, &m);
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cpf_revoke(gid);
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if (r != RTCDEV_REPLY || m.m_readclock_lc_rtcdev.status != 0) {
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log_warn(&log, "Call to '%s' failed.\n", target_label);
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return -1;
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}
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return OK;
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}
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int
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fwd_get_time(struct tm *t, int flags)
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{
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return fwd_msg(RTCDEV_GET_TIME_G, t, CPF_WRITE, flags);
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}
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int
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fwd_set_time(struct tm *t, int flags)
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{
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return fwd_msg(RTCDEV_SET_TIME_G, t, CPF_READ, flags);
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}
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int
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fwd_pwr_off(void)
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{
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return fwd_msg(RTCDEV_PWR_OFF, NULL, 0, RTCDEV_NOFLAGS);
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}
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void
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fwd_exit(void)
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{
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target_label = NULL;
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}
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