/*      $NetBSD: lm_i2c.c,v 1.7 2021/06/13 09:48:44 mlelstv Exp $       */

/*-
* Copyright (c) 2000 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Bill Squier.
*
* 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 <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: lm_i2c.c,v 1.7 2021/06/13 09:48:44 mlelstv Exp $");

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

#include <dev/i2c/i2cvar.h>

#include <dev/sysmon/sysmonvar.h>

#include <dev/ic/nslm7xvar.h>

int     lm_i2c_match(device_t, cfdata_t, void *);
void    lm_i2c_attach(device_t, device_t, void *);
int     lm_i2c_detach(device_t, int);

uint8_t lm_i2c_readreg(struct lm_softc *, int);
void    lm_i2c_writereg(struct lm_softc *, int, uint8_t);

struct lm_i2c_softc {
       struct lm_softc sc_lmsc;
       i2c_tag_t sc_tag;
       i2c_addr_t sc_addr;
};

CFATTACH_DECL_NEW(lm_iic, sizeof(struct lm_i2c_softc),
   lm_i2c_match, lm_i2c_attach, lm_i2c_detach, NULL);

int
lm_i2c_match(device_t parent, cfdata_t match, void *aux)
{
       struct i2c_attach_args *ia = aux;
       int rv = 0;
       struct lm_i2c_softc *sc;

       /* Must supply an address */
       if (ia->ia_addr < 1)
               return 0;

       /* XXXJRT filter addresses //at all// please? */

       /* Bus independent probe */
       sc = kmem_zalloc(sizeof(*sc), KM_SLEEP);
       sc->sc_lmsc.lm_writereg = lm_i2c_writereg;
       sc->sc_lmsc.lm_readreg = lm_i2c_readreg;
       sc->sc_tag = ia->ia_tag;
       sc->sc_addr = ia->ia_addr;
       rv = lm_match(&sc->sc_lmsc);
       kmem_free(sc, sizeof(*sc));

       return rv ? I2C_MATCH_ADDRESS_AND_PROBE : 0;
}


void
lm_i2c_attach(device_t parent, device_t self, void *aux)
{
       struct lm_i2c_softc *sc = device_private(self);
       struct i2c_attach_args *ia = aux;

       sc->sc_tag = ia->ia_tag;
       sc->sc_addr = ia->ia_addr;

       /* Bus-independent attachment */
       sc->sc_lmsc.sc_dev = self;
       sc->sc_lmsc.lm_writereg = lm_i2c_writereg;
       sc->sc_lmsc.lm_readreg = lm_i2c_readreg;

       lm_attach(&sc->sc_lmsc);
}

int
lm_i2c_detach(device_t self, int flags)
{
       struct lm_i2c_softc *sc = device_private(self);

       lm_detach(&sc->sc_lmsc);
       return 0;
}

uint8_t
lm_i2c_readreg(struct lm_softc *lmsc, int reg)
{
       struct lm_i2c_softc *sc = (struct lm_i2c_softc *)lmsc;
       uint8_t cmd, data;

       if (iic_acquire_bus(sc->sc_tag, 0))
               return 0;

       cmd = reg;
       iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
                sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0);

       iic_release_bus(sc->sc_tag, 0);

       return data;
}


void
lm_i2c_writereg(struct lm_softc *lmsc, int reg, uint8_t val)
{
       struct lm_i2c_softc *sc = (struct lm_i2c_softc *)lmsc;
       uint8_t cmd, data;

       if (iic_acquire_bus(sc->sc_tag, 0))
               return;

       cmd = reg;
       data = val;
       iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP,
                sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0);

       iic_release_bus(sc->sc_tag, 0);
}