/* $NetBSD: r2025.c,v 1.10 2020/01/02 19:00:34 thorpej Exp $ */

/*-
* Copyright (c) 2006 Shigeyuki Fukushima.
* All rights reserved.
*
* Written by Shigeyuki Fukushima.
*
* 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.
* 3. The name of the author may not be used to endorse or promote
*    products derived from this software without specific prior
*    written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 THE AUTHOR 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: r2025.c,v 1.10 2020/01/02 19:00:34 thorpej 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/r2025reg.h>

struct r2025rtc_softc {
       device_t                sc_dev;
       i2c_tag_t               sc_tag;
       int                     sc_address;
       int                     sc_open;
       struct todr_chip_handle sc_todr;
};

static void     r2025rtc_attach(device_t, device_t, void *);
static int      r2025rtc_match(device_t, cfdata_t, void *);

CFATTACH_DECL_NEW(r2025rtc, sizeof(struct r2025rtc_softc),
       r2025rtc_match, r2025rtc_attach, NULL, NULL);

static int      r2025rtc_gettime_ymdhms(struct todr_chip_handle *,
                                       struct clock_ymdhms *);
static int      r2025rtc_settime_ymdhms(struct todr_chip_handle *,
                                       struct clock_ymdhms *);
static int      r2025rtc_reg_write(struct r2025rtc_softc *, int, uint8_t*, int);
static int      r2025rtc_reg_read(struct r2025rtc_softc *, int, uint8_t*, int);


static int
r2025rtc_match(device_t parent, cfdata_t cf, void *arg)
{
       struct i2c_attach_args *ia = arg;

       /* match only R2025 RTC devices */
       if (ia->ia_addr == R2025_ADDR)
               return I2C_MATCH_ADDRESS_ONLY;

       return 0;
}

static void
r2025rtc_attach(device_t parent, device_t self, void *arg)
{
       struct r2025rtc_softc *sc = device_private(self);
       struct i2c_attach_args *ia = arg;

       aprint_normal(": RICOH R2025S/D Real-time Clock\n");

       sc->sc_tag = ia->ia_tag;
       sc->sc_address = ia->ia_addr;
       sc->sc_dev = self;
       sc->sc_open = 0;
       sc->sc_todr.cookie = sc;
       sc->sc_todr.todr_gettime = NULL;
       sc->sc_todr.todr_settime = NULL;
       sc->sc_todr.todr_gettime_ymdhms = r2025rtc_gettime_ymdhms;
       sc->sc_todr.todr_settime_ymdhms = r2025rtc_settime_ymdhms;
       sc->sc_todr.todr_setwen = NULL;

       todr_attach(&sc->sc_todr);
}

static int
r2025rtc_gettime_ymdhms(struct todr_chip_handle *ch, struct clock_ymdhms *dt)
{
       struct r2025rtc_softc *sc = ch->cookie;
       uint8_t rctrl;
       uint8_t bcd[R2025_CLK_SIZE];
       int hour;
       int error;

       memset(dt, 0, sizeof(*dt));

       if ((error = r2025rtc_reg_read(sc, R2025_REG_CTRL1, &rctrl, 1)) != 0) {
               aprint_error_dev(sc->sc_dev,
                   "r2025rtc_gettime: failed to read registers.\n");
               return error;
       }

       if ((error = r2025rtc_reg_read(sc, R2025_REG_SEC, &bcd[0],
                                      R2025_CLK_SIZE)) != 0) {
               aprint_error_dev(sc->sc_dev,
                   "r2025rtc_gettime: failed to read registers.\n");
               return error;
       }

       dt->dt_sec = bcdtobin(bcd[R2025_REG_SEC] & R2025_REG_SEC_MASK);
       dt->dt_min = bcdtobin(bcd[R2025_REG_MIN] & R2025_REG_MIN_MASK);
       hour = bcdtobin(bcd[R2025_REG_HOUR] & R2025_REG_HOUR_MASK);
       if (rctrl & R2025_REG_CTRL1_H1224) {
               dt->dt_hour = hour;
       } else {
               if (hour == 12) {
                       dt->dt_hour = 0;
               } else if (hour == 32) {
                       dt->dt_hour = 12;
               } else if (hour > 13) {
                       dt->dt_hour = (hour - 8);
               } else { /* (hour < 12) */
                       dt->dt_hour = hour;
               }
       }
       dt->dt_wday = bcdtobin(bcd[R2025_REG_WDAY] & R2025_REG_WDAY_MASK);
       dt->dt_day = bcdtobin(bcd[R2025_REG_DAY] & R2025_REG_DAY_MASK);
       dt->dt_mon = bcdtobin(bcd[R2025_REG_MON] & R2025_REG_MON_MASK);
       dt->dt_year = bcdtobin(bcd[R2025_REG_YEAR] & R2025_REG_YEAR_MASK)
               + ((bcd[R2025_REG_MON] & R2025_REG_MON_Y1920) ? 2000 : 1900);

       return 0;
}

static int
r2025rtc_settime_ymdhms(struct todr_chip_handle *ch, struct clock_ymdhms *dt)
{
       struct r2025rtc_softc *sc = ch->cookie;
       uint8_t rctrl;
       uint8_t bcd[R2025_CLK_SIZE];
       int error;

       /* Y3K problem */
       if (dt->dt_year >= 3000) {
               aprint_error_dev(sc->sc_dev,
                   "r2025rtc_settime: "
                   "RTC does not support year 3000 or over.\n");
               return EINVAL;
       }

       if ((error = r2025rtc_reg_read(sc, R2025_REG_CTRL1, &rctrl, 1)) != 0) {
               aprint_error_dev(sc->sc_dev,
                   "r2025rtc_settime: failed to read register.\n");
               return error;
       }
       rctrl |= R2025_REG_CTRL1_H1224;

       /* setup registers 0x00-0x06 (7 byte) */
       bcd[R2025_REG_SEC] = bintobcd(dt->dt_sec) & R2025_REG_SEC_MASK;
       bcd[R2025_REG_MIN] = bintobcd(dt->dt_min) & R2025_REG_MIN_MASK;
       bcd[R2025_REG_HOUR] = bintobcd(dt->dt_hour) & R2025_REG_HOUR_MASK;
       bcd[R2025_REG_WDAY] = bintobcd(dt->dt_wday) & R2025_REG_WDAY_MASK;
       bcd[R2025_REG_DAY] = bintobcd(dt->dt_day) & R2025_REG_DAY_MASK;
       bcd[R2025_REG_MON] = (bintobcd(dt->dt_mon) & R2025_REG_MON_MASK)
               | ((dt->dt_year >= 2000) ? R2025_REG_MON_Y1920 : 0);
       bcd[R2025_REG_YEAR] = bintobcd(dt->dt_year % 100) & R2025_REG_YEAR_MASK;

       /* Write RTC register */
       if ((error = r2025rtc_reg_write(sc, R2025_REG_CTRL1, &rctrl, 1)) != 0) {
               aprint_error_dev(sc->sc_dev,
                   "r2025rtc_settime: failed to write registers.\n");
               return error;
       }
       if ((error = r2025rtc_reg_write(sc, R2025_REG_SEC, bcd,
                                       R2025_CLK_SIZE)) != 0) {
               aprint_error_dev(sc->sc_dev,
                   "r2025rtc_settime: failed to write registers.\n");
               return error;
       }

       return 0;
}

static int
r2025rtc_reg_write(struct r2025rtc_softc *sc, int reg, uint8_t *val, int len)
{
       int i;
       uint8_t buf[1];
       uint8_t cmdbuf[1];
       int error;

       if ((error = iic_acquire_bus(sc->sc_tag, 0)) != 0) {
               aprint_error_dev(sc->sc_dev,
                   "r2025rtc_reg_write: failed to acquire I2C bus\n");
               return error;
       }

       for (i = 0 ; i < len ; i++) {
               cmdbuf[0] = (((reg + i) << 4) & 0xf0);
               buf[0] = val[i];
               if ((error = iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP,
                                     sc->sc_address, cmdbuf, 1, buf, 1,
                                     0)) != 0) {
                       iic_release_bus(sc->sc_tag, 0);
                       aprint_error_dev(sc->sc_dev, "r2025rtc_reg_write: "
                               "failed to write registers\n");
                       return error;
               }
       }

       iic_release_bus(sc->sc_tag, 0);

       return 0;
}

static int
r2025rtc_reg_read(struct r2025rtc_softc *sc, int reg, uint8_t *val, int len)
{
       int i;
       uint8_t buf[1];
       uint8_t cmdbuf[1];
       int error;

       if ((error = iic_acquire_bus(sc->sc_tag, 0)) != 0) {
               aprint_error_dev(sc->sc_dev,
                   "r2025rtc_reg_read: failed to acquire I2C bus\n");
               return error;
       }

       for (i = 0 ; i < len ; i++) {
               cmdbuf[0] = (((reg + i) << 4) & 0xf0);
               buf[0] = 0;
               if ((error = iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
                                     sc->sc_address, cmdbuf, 1, buf, 1,
                                     0)) != 0) {
                       iic_release_bus(sc->sc_tag, 0);
                       aprint_error_dev(sc->sc_dev, "r2025rtc_reg_read: "
                               "failed to read registers\n");
                       return error;
               }

               *(val + i) = buf[0];
       }

       iic_release_bus(sc->sc_tag, 0);

       return 0;
}

You are viewing proxied material from ftp.icm.edu.pl. The copyright of proxied material belongs to its original authors. Any comments or complaints in relation to proxied material should be directed to the original authors of the content concerned. Please see the disclaimer for more details.