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/* $OpenBSD: m41t8x.c,v 1.2 2020/10/23 20:55:15 patrick Exp $ */
/*
* Copyright (c) 2010 Miodrag Vallat.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* M41T8x clock connected to an I2C bus
*/
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <dev/clock_subr.h>
#include <dev/i2c/i2cvar.h>
#include <dev/ic/m41t8xreg.h>
struct m41t8xrtc_softc {
struct device sc_dev;
struct todr_chip_handle sc_todr;
i2c_tag_t sc_tag;
i2c_addr_t sc_addr;
};
int m41t8xrtc_match(struct device *, void *, void *);
void m41t8xrtc_attach(struct device *, struct device *, void *);
const struct cfattach mfokrtc_ca = {
sizeof(struct m41t8xrtc_softc),
m41t8xrtc_match, m41t8xrtc_attach
};
struct cfdriver mfokrtc_cd = {
NULL, "mfokrtc", DV_DULL
};
int m41t8xrtc_gettime(struct todr_chip_handle *, struct timeval *);
int m41t8xrtc_settime(struct todr_chip_handle *, struct timeval *);
int
m41t8xrtc_match(struct device *parent, void *vcf, void *aux)
{
struct i2c_attach_args *ia = (struct i2c_attach_args *)aux;
if (strcmp(ia->ia_name, "st,m41t83") == 0 ||
strcmp(ia->ia_name, "microcrystal,rv4162") == 0)
return (1);
return (0);
}
void
m41t8xrtc_attach(struct device *parent, struct device *self, void *aux)
{
struct m41t8xrtc_softc *sc = (struct m41t8xrtc_softc *)self;
struct i2c_attach_args *ia = (struct i2c_attach_args *)aux;
sc->sc_tag = ia->ia_tag;
sc->sc_addr = ia->ia_addr;
sc->sc_todr.cookie = sc;
sc->sc_todr.todr_gettime = m41t8xrtc_gettime;
sc->sc_todr.todr_settime = m41t8xrtc_settime;
todr_attach(&sc->sc_todr);
printf("\n");
}
int
m41t8xrtc_gettime(struct todr_chip_handle *handle, struct timeval *tv)
{
struct clock_ymdhms dt;
struct m41t8xrtc_softc *sc = handle->cookie;
uint8_t regno, data[M41T8X_TOD_LENGTH];
int s;
iic_acquire_bus(sc->sc_tag, 0);
s = splclock();
for (regno = M41T8X_TOD_START;
regno < M41T8X_TOD_START + M41T8X_TOD_LENGTH; regno++)
iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_addr,
®no, sizeof regno, data + regno - M41T8X_TOD_START,
sizeof data[0], 0);
splx(s);
iic_release_bus(sc->sc_tag, 0);
dt.dt_sec = FROMBCD(data[M41T8X_SEC] & ~M41T8X_STOP);
dt.dt_min = FROMBCD(data[M41T8X_MIN]);
dt.dt_hour = FROMBCD(data[M41T8X_HR] & ~(M41T8X_CEB | M41T8X_CB));
dt.dt_day = FROMBCD(data[M41T8X_DAY]);
dt.dt_mon = FROMBCD(data[M41T8X_MON]);
dt.dt_year = FROMBCD(data[M41T8X_YEAR]) + 2000;
if (data[M41T8X_HR] & M41T8X_CB)
dt.dt_year += 100;
tv->tv_sec = clock_ymdhms_to_secs(&dt);
tv->tv_usec = 0;
return 0;
}
int
m41t8xrtc_settime(struct todr_chip_handle *handle, struct timeval *tv)
{
struct clock_ymdhms dt;
struct m41t8xrtc_softc *sc = handle->cookie;
uint8_t regno, data[M41T8X_TOD_LENGTH];
int s;
clock_secs_to_ymdhms(tv->tv_sec, &dt);
iic_acquire_bus(sc->sc_tag, 0);
s = splclock();
/* read current state */
for (regno = M41T8X_TOD_START;
regno < M41T8X_TOD_START + M41T8X_TOD_LENGTH; regno++)
iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_addr,
®no, sizeof regno, data + regno - M41T8X_TOD_START,
sizeof data[0], 0);
/* compute new state */
data[M41T8X_HSEC] = 0;
data[M41T8X_SEC] = TOBCD(dt.dt_sec);
data[M41T8X_MIN] = TOBCD(dt.dt_min);
data[M41T8X_HR] &= M41T8X_CEB;
if (dt.dt_year >= 2100)
data[M41T8X_HR] |= M41T8X_CB;
data[M41T8X_HR] |= TOBCD(dt.dt_hour);
data[M41T8X_DOW] &= ~M41T8X_DOW_MASK;
data[M41T8X_DOW] |= TOBCD(dt.dt_wday + 1);
data[M41T8X_DAY] = TOBCD(dt.dt_day);
data[M41T8X_MON] = TOBCD(dt.dt_mon);
data[M41T8X_YEAR] = TOBCD(dt.dt_year % 100);
/* write new state */
for (regno = M41T8X_TOD_START;
regno < M41T8X_TOD_START + M41T8X_TOD_LENGTH; regno++)
iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, sc->sc_addr,
®no, sizeof regno, data + regno, sizeof data[0], 0);
splx(s);
iic_release_bus(sc->sc_tag, 0);
return 0;
}
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