/*      $NetBSD: pcf8563.c,v 1.15 2021/01/27 02:29:48 thorpej Exp $     */

/*
* Copyright (c) 2011 Jonathan A. Kollasch
* 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 THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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 COPYRIGHT HOLDER OR
* CONTRIBUTORS 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.
*/

/* XXX */
#if defined(__arm__) || defined(__aarch64__)
#include "opt_fdt.h"
#endif

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: pcf8563.c,v 1.15 2021/01/27 02:29:48 thorpej Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/kernel.h>

#include <dev/clock_subr.h>

#include <dev/i2c/i2cvar.h>
#include <dev/i2c/pcf8563reg.h>

#ifdef FDT
#include <dev/fdt/fdtvar.h>
#endif

static const struct device_compatible_entry compat_data[] = {
       { .compat = "nxp,pcf8563" },
       { .compat = "pcf8563rtc" },
       DEVICE_COMPAT_EOL
};

struct pcf8563rtc_softc {
       device_t sc_dev;
       i2c_tag_t sc_tag;
       int sc_addr;
       struct todr_chip_handle sc_todr;
};

static int pcf8563rtc_match(device_t, cfdata_t, void *);
static void pcf8563rtc_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(pcf8563rtc, sizeof(struct pcf8563rtc_softc),
   pcf8563rtc_match, pcf8563rtc_attach, NULL, NULL);

static int pcf8563rtc_clock_read(struct pcf8563rtc_softc *, struct clock_ymdhms *);
static int pcf8563rtc_clock_write(struct pcf8563rtc_softc *, struct clock_ymdhms *);
static int pcf8563rtc_gettime(struct todr_chip_handle *, struct clock_ymdhms *);
static int pcf8563rtc_settime(struct todr_chip_handle *, struct clock_ymdhms *);

static int
pcf8563rtc_match(device_t parent, cfdata_t cf, void *aux)
{
       struct i2c_attach_args *ia = aux;
       int match_result;

       if (iic_use_direct_match(ia, cf, compat_data, &match_result))
               return match_result;

       /* indirect config - check typical address */
       if (ia->ia_addr == PCF8563_ADDR)
               return I2C_MATCH_ADDRESS_ONLY;

       return 0;
}

static void
pcf8563rtc_attach(device_t parent, device_t self, void *aux)
{
       struct pcf8563rtc_softc *sc = device_private(self);
       struct i2c_attach_args *ia = aux;
       int error;

       aprint_naive(": Real-time Clock\n");
       aprint_normal(": NXP PCF8563 Real-time Clock\n");

       sc->sc_dev = self;
       sc->sc_tag = ia->ia_tag;
       sc->sc_addr = ia->ia_addr;
       sc->sc_todr.cookie = sc;
       sc->sc_todr.todr_gettime_ymdhms = pcf8563rtc_gettime;
       sc->sc_todr.todr_settime_ymdhms = pcf8563rtc_settime;
       sc->sc_todr.todr_setwen = NULL;

       if ((error = iic_acquire_bus(sc->sc_tag, 0)) != 0) {
               aprint_error_dev(sc->sc_dev,
                   "failed to acquire bus for attach\n");
               return;
       }
       if ((error = iic_smbus_write_byte(sc->sc_tag, sc->sc_addr,
                                         PCF8563_R_CS1, 0, 0)) == 0) {
               error = iic_smbus_write_byte(sc->sc_tag, sc->sc_addr,
                                            PCF8563_R_CS2, 0, 0);
       }
       iic_release_bus(sc->sc_tag, 0);
       if (error) {
               aprint_error_dev(sc->sc_dev, "failed to initialize RTC\n");
               return;
       }

#ifdef FDT
       fdtbus_todr_attach(self, ia->ia_cookie, &sc->sc_todr);
#else
       todr_attach(&sc->sc_todr);
#endif
}

static int
pcf8563rtc_gettime(struct todr_chip_handle *ch, struct clock_ymdhms *dt)
{
       struct pcf8563rtc_softc *sc = ch->cookie;

       return pcf8563rtc_clock_read(sc, dt);
}

static int
pcf8563rtc_settime(struct todr_chip_handle *ch, struct clock_ymdhms *dt)
{
       struct pcf8563rtc_softc *sc = ch->cookie;

       return pcf8563rtc_clock_write(sc, dt);
}

static int
pcf8563rtc_clock_read(struct pcf8563rtc_softc *sc, struct clock_ymdhms *dt)
{
       uint8_t bcd[PCF8563_NREGS];
       uint8_t reg = PCF8563_R_SECOND;
       int error;

       if ((error = iic_acquire_bus(sc->sc_tag, 0)) != 0) {
               device_printf(sc->sc_dev, "acquire bus for read failed\n");
               return error;
       }

       if ((error = iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_addr,
                             &reg, 1, &bcd[reg], PCF8563_R_YEAR - reg + 1,
                             0)) != 0) {
               iic_release_bus(sc->sc_tag, 0);
               device_printf(sc->sc_dev, "read failed\n");
               return error;
       }

       iic_release_bus(sc->sc_tag, 0);

       if (bcd[PCF8563_R_SECOND] & PCF8563_M_VL)
               return EIO;

       dt->dt_sec = bcdtobin(bcd[PCF8563_R_SECOND] & PCF8563_M_SECOND);
       dt->dt_min = bcdtobin(bcd[PCF8563_R_MINUTE] & PCF8563_M_MINUTE);
       dt->dt_hour = bcdtobin(bcd[PCF8563_R_HOUR] & PCF8563_M_HOUR);
       dt->dt_day = bcdtobin(bcd[PCF8563_R_DAY] & PCF8563_M_DAY);
       dt->dt_wday = bcdtobin(bcd[PCF8563_R_WEEKDAY] & PCF8563_M_WEEKDAY);
       dt->dt_mon = bcdtobin(bcd[PCF8563_R_MONTH] & PCF8563_M_MONTH);
       dt->dt_year = 1900 +
           (bcdtobin(bcd[PCF8563_R_YEAR] & PCF8563_M_YEAR) % 100);
       if ((bcd[PCF8563_R_MONTH] & PCF8563_M_CENTURY) == 0)
               dt->dt_year += 100;

       return error;
}

static int
pcf8563rtc_clock_write(struct pcf8563rtc_softc *sc, struct clock_ymdhms *dt)
{
       uint8_t bcd[PCF8563_NREGS];
       uint8_t reg = PCF8563_R_SECOND;
       int error;

       bcd[PCF8563_R_SECOND] = bintobcd(dt->dt_sec);
       bcd[PCF8563_R_MINUTE] = bintobcd(dt->dt_min);
       bcd[PCF8563_R_HOUR] = bintobcd(dt->dt_hour);
       bcd[PCF8563_R_DAY] = bintobcd(dt->dt_day);
       bcd[PCF8563_R_WEEKDAY] = bintobcd(dt->dt_wday);
       bcd[PCF8563_R_MONTH] = bintobcd(dt->dt_mon);
       bcd[PCF8563_R_YEAR] = bintobcd(dt->dt_year % 100);
       if (dt->dt_year < 2000)
               bcd[PCF8563_R_MONTH] |= PCF8563_M_CENTURY;

       if ((error = iic_acquire_bus(sc->sc_tag, 0)) != 0) {
               device_printf(sc->sc_dev, "acquire bus for write failed\n");
               return error;
       }

       if ((error = iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, sc->sc_addr, &reg, 1, &bcd[reg], PCF8563_R_YEAR - reg + 1, 0)) != 0) {
               iic_release_bus(sc->sc_tag, 0);
               device_printf(sc->sc_dev, "write failed\n");
               return error;
       }

       iic_release_bus(sc->sc_tag, 0);

       return error;
}

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