/* $NetBSD: ac100.c,v 1.11 2025/09/17 13:49:13 thorpej Exp $ */

/*-
 * Copyright (c) 2014 Jared D. McNeill <jmcneill@invisible.ca>
 * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
 */

#include "opt_fdt.h"

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ac100.c,v 1.11 2025/09/17 13:49:13 thorpej Exp $");

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

#include <dev/clock_subr.h>

#include <dev/i2c/i2cvar.h>

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

#define AC100_CHIP_AUDIO_RST_REG        0x00
#define AC100_PLL_CTRL1_REG             0x02
#define AC100_PLL_CTRL2_REG             0x03
#define AC100_SYSCLK_CTRL_REG           0x04
#define AC100_MOD_RST_CTRL_REG          0x05
#define AC100_ADDA_SR_CTRL_REG          0x06
#define AC100_I2S1_LCK_CTRL_REG         0x10
#define AC100_I2S1_SDIN_CTRL_REG        0x11
#define AC100_I2S1_SDOUT_CTRL_REG       0x12
#define AC100_I2S1_DIG_MIXER_REG        0x13
#define AC100_I2S1_VOL_CTRL1_REG        0x14
#define AC100_I2S1_VOL_CTRL2_REG        0x15
#define AC100_I2S1_VOL_CTRL3_REG        0x16
#define AC100_I2S1_VOL_CTRL4_REG        0x17
#define AC100_I2S1_MXR_GAIN_REG         0x18
#define AC100_I2S2_CLK_CTRL_REG         0x20
#define AC100_I2S2_SDIN_CTRL_REG        0x21
#define AC100_I2S2_SDOUT_CTRL_REG       0x22
#define AC100_I2S2_DIG_MIXER_REG        0x23
#define AC100_I2S2_VOL_CTRL1_REG        0x24
#define AC100_I2S2_VOL_CTRL2_REG        0x26
#define AC100_I2S2_MXR_GAIN_REG         0x28
#define AC100_I2S3_CLK_CTRL_REG         0x30
#define AC100_I2S3_SDIN_CTRL_REG        0x31
#define AC100_I2S3_SDOUT_CTRL_REG       0x32
#define AC100_I2S3_SGP_CTRL_REG         0x33
#define AC100_ADC_DIG_CTRL_REG          0x40

#define AC100_RTC_RESET_REG             0xc6
#define AC100_RTC_CTRL_REG              0xc7
#define AC100_RTC_SEC_REG               0xc8
#define AC100_RTC_MIN_REG               0xc9
#define AC100_RTC_HOU_REG               0xca
#define AC100_RTC_WEE_REG               0xcb
#define AC100_RTC_DAY_REG               0xcc
#define AC100_RTC_MON_REG               0xcd
#define AC100_RTC_YEA_REG               0xce
#define AC100_RTC_UPD_TRIG_REG          0xcf

#define AC100_RTC_GP_REG(n)             (0xe0 + (n))

#define AC100_RTC_CTRL_12H_24H_MODE     __BIT(0)

#define AC100_RTC_UPD_TRIG_WRITE        __BIT(15)

static const struct device_compatible_entry compat_data[] = {
        { .compat = "x-powers,ac100" },
        DEVICE_COMPAT_EOL
};

struct ac100_softc {
        device_t        sc_dev;
        i2c_tag_t       sc_i2c;
        i2c_addr_t      sc_addr;
};

static int      ac100_match(device_t, cfdata_t, void *);
static void     ac100_attach(device_t, device_t, void *);

static int      ac100_rtc_gettime(todr_chip_handle_t, struct clock_ymdhms *);
static int      ac100_rtc_settime(todr_chip_handle_t, struct clock_ymdhms *);

static int      ac100_read(struct ac100_softc *, uint8_t, uint16_t *);
static int      ac100_write(struct ac100_softc *, uint8_t, uint16_t);

CFATTACH_DECL_NEW(ac100ic, sizeof(struct ac100_softc),
    ac100_match, ac100_attach, NULL, NULL);

struct ac100rtc_softc {
        device_t        sc_dev;

        struct todr_chip_handle sc_todr;
};

static int      ac100rtc_match(device_t, cfdata_t, void *);
static void     ac100rtc_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(ac100rtc, sizeof(struct ac100rtc_softc),
    ac100rtc_match, ac100rtc_attach, NULL, NULL);

static int
ac100_match(device_t parent, cfdata_t match, void *aux)
{
        struct i2c_attach_args *ia = aux;
        int match_result;

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

        /* This device is direct-config only. */

        return 0;
}

static void
ac100_attach(device_t parent, device_t self, void *aux)
{
        struct ac100_softc *sc = device_private(self);
        struct i2c_attach_args *ia = aux;

        sc->sc_dev = self;
        sc->sc_i2c = ia->ia_tag;
        sc->sc_addr = ia->ia_addr;

        aprint_naive("\n");
        aprint_normal(": CODEC/RTC\n");

        iic_acquire_bus(sc->sc_i2c, 0);
        ac100_write(sc, AC100_RTC_CTRL_REG, AC100_RTC_CTRL_12H_24H_MODE);
        iic_release_bus(sc->sc_i2c, 0);

#ifdef FDT
        if (devhandle_type(device_handle(self)) == DEVHANDLE_TYPE_OF) {
                int phandle = devhandle_to_of(device_handle(self));
                fdt_add_bus(self, phandle, NULL);
        }
#endif
}

#ifdef FDT
static const struct device_compatible_entry rtc_compat_data[] = {
        { .compat = "x-powers,ac100-rtc" },
        DEVICE_COMPAT_EOL
};

static int
ac100rtc_match(device_t parent, cfdata_t match, void *aux)
{
        struct fdt_attach_args * const faa = aux;

        return of_compatible_match(faa->faa_phandle, rtc_compat_data);
}

static void
ac100rtc_attach(device_t parent, device_t self, void *aux)
{
        struct ac100rtc_softc *sc = device_private(self);

        sc->sc_dev = self;
        aprint_naive("\n");
        aprint_normal("\n");

        sc->sc_todr.todr_gettime_ymdhms = ac100_rtc_gettime;
        sc->sc_todr.todr_settime_ymdhms = ac100_rtc_settime;
        sc->sc_todr.todr_dev = self;

        todr_attach(&sc->sc_todr);
}
#endif /* FDT */

static int
ac100_read(struct ac100_softc *sc, uint8_t reg, uint16_t *val)
{
        return iic_smbus_read_word(sc->sc_i2c, sc->sc_addr, reg, val, 0);
}

static int
ac100_write(struct ac100_softc *sc, uint8_t reg, uint16_t val)
{
        return iic_smbus_write_word(sc->sc_i2c, sc->sc_addr, reg, val, 0);
}

static int
ac100_rtc_gettime(todr_chip_handle_t tch, struct clock_ymdhms *dt)
{
        struct ac100_softc *sc = device_private(device_parent(tch->todr_dev));
        uint16_t sec, min, hou, wee, day, mon, yea;

        iic_acquire_bus(sc->sc_i2c, 0);
        ac100_read(sc, AC100_RTC_SEC_REG, &sec);
        ac100_read(sc, AC100_RTC_MIN_REG, &min);
        ac100_read(sc, AC100_RTC_HOU_REG, &hou);
        ac100_read(sc, AC100_RTC_WEE_REG, &wee);
        ac100_read(sc, AC100_RTC_DAY_REG, &day);
        ac100_read(sc, AC100_RTC_MON_REG, &mon);
        ac100_read(sc, AC100_RTC_YEA_REG, &yea);
        iic_release_bus(sc->sc_i2c, 0);

        dt->dt_year = POSIX_BASE_YEAR + bcdtobin(yea & 0xff);
        dt->dt_mon = bcdtobin(mon & 0x1f);
        dt->dt_day = bcdtobin(day & 0x3f);
        dt->dt_wday = bcdtobin(wee & 0x7);
        dt->dt_hour = bcdtobin(hou & 0x3f);
        dt->dt_min = bcdtobin(min & 0x7f);
        dt->dt_sec = bcdtobin(sec & 0x7f);

        return 0;
}

static int
ac100_rtc_settime(todr_chip_handle_t tch, struct clock_ymdhms *dt)
{
        struct ac100_softc *sc = device_private(device_parent(tch->todr_dev));

        iic_acquire_bus(sc->sc_i2c, 0);
        ac100_write(sc, AC100_RTC_SEC_REG, bintobcd(dt->dt_sec) & 0x7f);
        ac100_write(sc, AC100_RTC_MIN_REG, bintobcd(dt->dt_min) & 0x7f);
        ac100_write(sc, AC100_RTC_HOU_REG, bintobcd(dt->dt_hour) & 0x3f);
        ac100_write(sc, AC100_RTC_WEE_REG, bintobcd(dt->dt_wday) & 0x7);
        ac100_write(sc, AC100_RTC_DAY_REG, bintobcd(dt->dt_day) & 0x3f);
        ac100_write(sc, AC100_RTC_MON_REG, bintobcd(dt->dt_mon) & 0x1f);
        ac100_write(sc, AC100_RTC_YEA_REG,
            bintobcd(dt->dt_year - POSIX_BASE_YEAR) & 0xff);
        ac100_write(sc, AC100_RTC_UPD_TRIG_REG, AC100_RTC_UPD_TRIG_WRITE);
        iic_release_bus(sc->sc_i2c, 0);

        return 0;
}