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/* $OpenBSD: ds1307.c,v 1.8 2022/10/20 10:35:35 mglocker Exp $ */
/*
* Copyright (c) 2016 Marcus Glocker <mglocker@openbsd.org>
*
* 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.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <dev/clock_subr.h>
#include <dev/i2c/i2cvar.h>
/*
* Defines.
*/
/* RTC Registers */
#define DS1307_SEC_REG 0x00
#define DS1307_SEC_MASK 0x7f
#define DS1307_SEC_MASK_CH 0x80 /* Clock Halt bit */
#define DS1307_SEC_BIT_CH 7 /* 0 = osc enabled, 1 = osc disabled */
#define DS1307_MIN_REG 0x01
#define DS1307_MIN_MASK 0x7f
#define DS1307_HOUR_REG 0x02
#define DS1307_HOUR_MASK 0x3f
#define DS1307_HOUR_MASK_MODE 0x40 /* Hour Mode bit */
#define DS1307_HOUR_BIT_MODE 6 /* 0 = 24h mode, 1 = 12h mode */
#define DS1307_WDAY_REG 0x03
#define DS1307_WDAY_MASK 0x07
#define DS1307_DATE_REG 0x04
#define DS1307_DATE_MASK 0x3f
#define DS1307_MONTH_REG 0x05
#define DS1307_MONTH_MASK 0x1f
#define DS1307_YEAR_REG 0x06
#define DS1307_YEAR_MASK 0xff
#define DS1307_CTRL_REG 0x07
/* RAM Registers */
#define DS1307_RAM_REG 0x08 /* RAM address space 0x08 - 0x3f */
/*
* Driver structure.
*/
struct maxrtc_softc {
struct device sc_dev;
i2c_tag_t sc_tag;
int sc_addr;
struct todr_chip_handle sc_todr;
};
/*
* Prototypes.
*/
int maxrtc_match(struct device *, void *, void *);
void maxrtc_attach(struct device *, struct device *, void *);
int maxrtc_read(struct maxrtc_softc *, uint8_t *, uint8_t,
uint8_t *, uint8_t);
int maxrtc_write(struct maxrtc_softc *, uint8_t *, uint8_t);
int maxrtc_enable_osc(struct maxrtc_softc *);
int maxrtc_set_24h_mode(struct maxrtc_softc *);
int maxrtc_gettime(struct todr_chip_handle *, struct timeval *);
int maxrtc_settime(struct todr_chip_handle *, struct timeval *);
/*
* Driver glue structures.
*/
const struct cfattach maxrtc_ca = {
sizeof(struct maxrtc_softc), maxrtc_match, maxrtc_attach
};
struct cfdriver maxrtc_cd = {
NULL, "maxrtc", DV_DULL
};
/*
* Functions.
*/
int
maxrtc_match(struct device *parent, void *v, void *arg)
{
struct i2c_attach_args *ia = arg;
if (strcmp(ia->ia_name, "dallas,ds1307") == 0 ||
strcmp(ia->ia_name, "ds1307") == 0 ||
strcmp(ia->ia_name, "dallas,ds1339") == 0)
return (1);
return (0);
}
void
maxrtc_attach(struct device *parent, struct device *self, void *arg)
{
struct maxrtc_softc *sc = (struct maxrtc_softc *)self;
struct i2c_attach_args *ia = arg;
sc->sc_tag = ia->ia_tag;
sc->sc_addr = ia->ia_addr;
if (maxrtc_enable_osc(sc) == -1)
return;
if (maxrtc_set_24h_mode(sc) == -1)
return;
sc->sc_todr.cookie = sc;
sc->sc_todr.todr_gettime = maxrtc_gettime;
sc->sc_todr.todr_settime = maxrtc_settime;
sc->sc_todr.todr_quality = 1000;
todr_attach(&sc->sc_todr);
}
int
maxrtc_read(struct maxrtc_softc *sc, uint8_t *cmd, uint8_t cmd_len,
uint8_t *data, uint8_t data_len)
{
int r;
iic_acquire_bus(sc->sc_tag, I2C_F_POLL);
if ((r = iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_addr,
cmd, cmd_len, data, data_len, I2C_F_POLL)))
printf("%s: maxrtc_read failed\n", sc->sc_dev.dv_xname);
iic_release_bus(sc->sc_tag, I2C_F_POLL);
return (r);
}
int
maxrtc_write(struct maxrtc_softc *sc, uint8_t *data, uint8_t data_len)
{
int r;
/*
* On write operation the DS1307 requires the target address to be
* stored in the first byte of the data packet. Therefore we don't
* fill up the command packet here.
*/
iic_acquire_bus(sc->sc_tag, I2C_F_POLL);
if ((r = iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, sc->sc_addr,
NULL, 0, data, data_len, I2C_F_POLL)))
printf("%s: maxrtc_write failed\n", sc->sc_dev.dv_xname);
iic_release_bus(sc->sc_tag, I2C_F_POLL);
return (r);
}
int
maxrtc_enable_osc(struct maxrtc_softc *sc)
{
uint8_t cmd;
uint8_t data_r;
uint8_t data_w[2];
cmd = DS1307_SEC_REG;
data_r = 0;
if (maxrtc_read(sc, &cmd, sizeof(cmd), &data_r, sizeof(data_r))) {
printf("%s: maxrtc_enable_osc failed\n", sc->sc_dev.dv_xname);
return (-1);
}
if ((data_r & DS1307_SEC_MASK_CH) == 0) {
/* oscillator is already enabled */
printf(": rtc is ok\n");
return (0);
}
printf(": rtc was halted, check battery\n");
/* enable the oscillator */
data_r |= 0 << DS1307_SEC_BIT_CH;
data_w[0] = DS1307_SEC_REG;
data_w[1] = data_r;
if (maxrtc_write(sc, data_w, sizeof(data_w))) {
printf("%s: maxrtc_enable_osc failed\n", sc->sc_dev.dv_xname);
return (-1);
}
return (0);
}
int
maxrtc_set_24h_mode(struct maxrtc_softc *sc)
{
uint8_t cmd;
uint8_t data_r;
uint8_t data_w[2];
cmd = DS1307_HOUR_REG;
data_r = 0;
if (maxrtc_read(sc, &cmd, sizeof(cmd), &data_r, sizeof(data_r))) {
printf("%s: maxrtc_set_24h_mode failed\n", sc->sc_dev.dv_xname);
return (-1);
}
if ((data_r & DS1307_HOUR_MASK_MODE) == 0) {
/* 24h mode is already set */
return (0);
}
/* set 24h mode */
data_r |= 0 << DS1307_HOUR_BIT_MODE;
data_w[0] = DS1307_HOUR_REG;
data_w[1] = data_r;
if (maxrtc_write(sc, data_w, sizeof(data_w))) {
printf("%s: maxrtc_set_24h_mode failed\n", sc->sc_dev.dv_xname);
return (-1);
}
return (0);
}
int
maxrtc_gettime(struct todr_chip_handle *ch, struct timeval *tv)
{
struct maxrtc_softc *sc = ch->cookie;
struct clock_ymdhms dt;
uint8_t cmd;
uint8_t data[7];
cmd = DS1307_SEC_REG;
memset(data, 0, sizeof(data));
if (maxrtc_read(sc, &cmd, sizeof(cmd), data, sizeof(data))) {
printf("%s: maxrtc_gettime failed\n", sc->sc_dev.dv_xname);
return (-1);
}
dt.dt_sec = FROMBCD(data[DS1307_SEC_REG] & DS1307_SEC_MASK);
dt.dt_min = FROMBCD(data[DS1307_MIN_REG] & DS1307_MIN_MASK);
dt.dt_hour = FROMBCD(data[DS1307_HOUR_REG] & DS1307_HOUR_MASK);
dt.dt_wday = FROMBCD(data[DS1307_WDAY_REG] & DS1307_WDAY_MASK);
dt.dt_day = FROMBCD(data[DS1307_DATE_REG] & DS1307_DATE_MASK);
dt.dt_mon = FROMBCD(data[DS1307_MONTH_REG] & DS1307_MONTH_MASK);
dt.dt_year = FROMBCD(data[DS1307_YEAR_REG] & DS1307_YEAR_MASK) + 2000;
tv->tv_sec = clock_ymdhms_to_secs(&dt);
tv->tv_usec = 0;
return (0);
}
int
maxrtc_settime(struct todr_chip_handle *ch, struct timeval *tv)
{
struct maxrtc_softc *sc = ch->cookie;
struct clock_ymdhms dt;
uint8_t data[8];
clock_secs_to_ymdhms(tv->tv_sec, &dt);
data[0] = DS1307_SEC_REG;
data[1] = TOBCD(dt.dt_sec); /* this will also enable the osc */
data[2] = TOBCD(dt.dt_min);
data[3] = TOBCD(dt.dt_hour); /* this will also set 24h mode */
data[4] = TOBCD(dt.dt_wday);
data[5] = TOBCD(dt.dt_day);
data[6] = TOBCD(dt.dt_mon);
data[7] = TOBCD(dt.dt_year - 2000);
if (maxrtc_write(sc, data, sizeof(data))) {
printf("%s: maxrtc_settime failed\n", sc->sc_dev.dv_xname);
return (-1);
}
return (0);
}
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