NetBSD-5.0.2/sys/dev/i2c/rs5c372.c
/* $NetBSD: rs5c372.c,v 1.9 2008/05/04 15:26:29 xtraeme Exp $ */
/*
* Copyright (c) 2005 Kimihiro Nonaka
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: rs5c372.c,v 1.9 2008/05/04 15:26:29 xtraeme Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/kernel.h>
#include <sys/fcntl.h>
#include <sys/uio.h>
#include <sys/conf.h>
#include <sys/event.h>
#include <dev/clock_subr.h>
#include <dev/i2c/i2cvar.h>
#include <dev/i2c/rs5c372reg.h>
struct rs5c372rtc_softc {
device_t sc_dev;
i2c_tag_t sc_tag;
int sc_address;
struct todr_chip_handle sc_todr;
};
static int rs5c372rtc_match(device_t, cfdata_t, void *);
static void rs5c372rtc_attach(device_t, device_t, void *);
CFATTACH_DECL_NEW(rs5c372rtc, sizeof(struct rs5c372rtc_softc),
rs5c372rtc_match, rs5c372rtc_attach, NULL, NULL);
static void rs5c372rtc_reg_write(struct rs5c372rtc_softc *, int, uint8_t);
static int rs5c372rtc_clock_read(struct rs5c372rtc_softc *, struct clock_ymdhms *);
static int rs5c372rtc_clock_write(struct rs5c372rtc_softc *, struct clock_ymdhms *);
static int rs5c372rtc_gettime(struct todr_chip_handle *, volatile struct timeval *);
static int rs5c372rtc_settime(struct todr_chip_handle *, volatile struct timeval *);
static int
rs5c372rtc_match(device_t parent, cfdata_t cf, void *arg)
{
struct i2c_attach_args *ia = arg;
if (ia->ia_addr == RS5C372_ADDR)
return (1);
return (0);
}
static void
rs5c372rtc_attach(device_t parent, device_t self, void *arg)
{
struct rs5c372rtc_softc *sc = device_private(self);
struct i2c_attach_args *ia = arg;
aprint_naive(": Real-time Clock\n");
aprint_normal(": RICOH RS5C372[AB] Real-time Clock\n");
sc->sc_tag = ia->ia_tag;
sc->sc_address = ia->ia_addr;
sc->sc_dev = self;
sc->sc_todr.cookie = sc;
sc->sc_todr.todr_gettime = rs5c372rtc_gettime;
sc->sc_todr.todr_settime = rs5c372rtc_settime;
sc->sc_todr.todr_setwen = NULL;
todr_attach(&sc->sc_todr);
/* Initialize RTC */
rs5c372rtc_reg_write(sc, RS5C372_CONTROL2, RS5C372_CONTROL2_24HRS);
rs5c372rtc_reg_write(sc, RS5C372_CONTROL1, 0);
}
static int
rs5c372rtc_gettime(struct todr_chip_handle *ch, volatile struct timeval *tv)
{
struct rs5c372rtc_softc *sc = ch->cookie;
struct clock_ymdhms dt;
memset(&dt, 0, sizeof(dt));
if (rs5c372rtc_clock_read(sc, &dt) == 0)
return (-1);
tv->tv_sec = clock_ymdhms_to_secs(&dt);
tv->tv_usec = 0;
return (0);
}
static int
rs5c372rtc_settime(struct todr_chip_handle *ch, volatile struct timeval *tv)
{
struct rs5c372rtc_softc *sc = ch->cookie;
struct clock_ymdhms dt;
clock_secs_to_ymdhms(tv->tv_sec, &dt);
if (rs5c372rtc_clock_write(sc, &dt) == 0)
return (-1);
return (0);
}
static void
rs5c372rtc_reg_write(struct rs5c372rtc_softc *sc, int reg, uint8_t val)
{
uint8_t cmdbuf[2];
if (iic_acquire_bus(sc->sc_tag, I2C_F_POLL)) {
aprint_error_dev(sc->sc_dev,
"rs5c372rtc_reg_write: failed to acquire I2C bus\n");
return;
}
reg &= 0xf;
cmdbuf[0] = (reg << 4);
cmdbuf[1] = val;
if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, sc->sc_address,
cmdbuf, 1, &cmdbuf[1], 1, I2C_F_POLL)) {
iic_release_bus(sc->sc_tag, I2C_F_POLL);
aprint_error_dev(sc->sc_dev,
"rs5c372rtc_reg_write: failed to write reg%d\n", reg);
return;
}
iic_release_bus(sc->sc_tag, I2C_F_POLL);
}
static int
rs5c372rtc_clock_read(struct rs5c372rtc_softc *sc, struct clock_ymdhms *dt)
{
uint8_t bcd[RS5C372_NRTC_REGS];
uint8_t cmdbuf[1];
if (iic_acquire_bus(sc->sc_tag, I2C_F_POLL)) {
aprint_error_dev(sc->sc_dev,
"rs5c372rtc_clock_read: failed to acquire I2C bus\n");
return (0);
}
cmdbuf[0] = (RS5C372_SECONDS << 4);
if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_address,
cmdbuf, 1, bcd, RS5C372_NRTC_REGS, I2C_F_POLL)) {
iic_release_bus(sc->sc_tag, I2C_F_POLL);
aprint_error_dev(sc->sc_dev,
"rs5c372rtc_clock_read: failed to read rtc\n");
return (0);
}
iic_release_bus(sc->sc_tag, I2C_F_POLL);
/*
* Convert the RS5C372's register values into something useable
*/
dt->dt_sec = FROMBCD(bcd[RS5C372_SECONDS] & RS5C372_SECONDS_MASK);
dt->dt_min = FROMBCD(bcd[RS5C372_MINUTES] & RS5C372_MINUTES_MASK);
dt->dt_hour = FROMBCD(bcd[RS5C372_HOURS] & RS5C372_HOURS_24MASK);
dt->dt_day = FROMBCD(bcd[RS5C372_DATE] & RS5C372_DATE_MASK);
dt->dt_mon = FROMBCD(bcd[RS5C372_MONTH] & RS5C372_MONTH_MASK);
dt->dt_year = FROMBCD(bcd[RS5C372_YEAR]) + 2000;
return (1);
}
static int
rs5c372rtc_clock_write(struct rs5c372rtc_softc *sc, struct clock_ymdhms *dt)
{
uint8_t bcd[RS5C372_NRTC_REGS];
uint8_t cmdbuf[1];
/*
* Convert our time representation into something the RS5C372
* can understand.
*/
bcd[RS5C372_SECONDS] = TOBCD(dt->dt_sec);
bcd[RS5C372_MINUTES] = TOBCD(dt->dt_min);
bcd[RS5C372_HOURS] = TOBCD(dt->dt_hour);
bcd[RS5C372_DATE] = TOBCD(dt->dt_day);
bcd[RS5C372_DAY] = TOBCD(dt->dt_wday);
bcd[RS5C372_MONTH] = TOBCD(dt->dt_mon);
bcd[RS5C372_YEAR] = TOBCD(dt->dt_year % 100);
if (iic_acquire_bus(sc->sc_tag, I2C_F_POLL)) {
aprint_error_dev(sc->sc_dev, "rs5c372rtc_clock_write: failed to "
"acquire I2C bus\n");
return (0);
}
cmdbuf[0] = (RS5C372_SECONDS << 4);
if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, sc->sc_address,
cmdbuf, 1, bcd, RS5C372_NRTC_REGS, I2C_F_POLL)) {
iic_release_bus(sc->sc_tag, I2C_F_POLL);
aprint_error_dev(sc->sc_dev,
"rs5c372rtc_clock_write: failed to write rtc\n");
return (0);
}
iic_release_bus(sc->sc_tag, I2C_F_POLL);
return (1);
}