/* $NetBSD: auvitek_i2c.c,v 1.8 2022/03/13 12:49:36 riastradh Exp $ */

/*-
* Copyright (c) 2010 Jared D. McNeill <[email protected]>
* 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.
*/

/*
* Auvitek AU0828 USB controller - I2C access ops
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: auvitek_i2c.c,v 1.8 2022/03/13 12:49:36 riastradh Exp $");

#ifdef _KERNEL_OPT
#include "opt_usb.h"
#endif

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

#include <dev/usb/usb.h>
#include <dev/usb/usbdi.h>
#include <dev/usb/usbdi_util.h>
#include <dev/usb/usbdevs.h>

#include <dev/i2c/i2cvar.h>

#include <dev/usb/auvitekreg.h>
#include <dev/usb/auvitekvar.h>

/* #define AUVITEK_I2C_DEBUG */

static int      auvitek_i2c_exec(void *, i2c_op_t, i2c_addr_t,
                                const void *, size_t, void *, size_t, int);

static int      auvitek_i2c_read(struct auvitek_softc *, i2c_addr_t,
                                uint8_t *, size_t);
static int      auvitek_i2c_write(struct auvitek_softc *, i2c_addr_t,
                                 const uint8_t *, size_t);
static bool     auvitek_i2c_wait(struct auvitek_softc *);
static bool     auvitek_i2c_wait_rdack(struct auvitek_softc *);
static bool     auvitek_i2c_wait_rddone(struct auvitek_softc *);
static bool     auvitek_i2c_wait_wrdone(struct auvitek_softc *);

int
auvitek_i2c_attach(struct auvitek_softc *sc)
{

       iic_tag_init(&sc->sc_i2c);
       sc->sc_i2c.ic_cookie = sc;
       sc->sc_i2c.ic_exec = auvitek_i2c_exec;

       auvitek_i2c_rescan(sc, NULL, NULL);

       sc->sc_i2c_attached = true;

       return 0;
}

int
auvitek_i2c_detach(struct auvitek_softc *sc, int flags)
{

       if (!sc->sc_i2c_attached)
               return 0;

       iic_tag_fini(&sc->sc_i2c);

       return 0;
}

void
auvitek_i2c_rescan(struct auvitek_softc *sc, const char *ifattr,
   const int *locs)
{
#ifdef AUVITEK_I2C_DEBUG
       struct i2cbus_attach_args iba;

       if (ifattr_match(ifattr, "i2cbus") && sc->sc_i2cdev == NULL) {
               memset(&iba, 0, sizeof(iba));
               iba.iba_tag = &sc->sc_i2c;
               sc->sc_i2cdev = config_found(sc->sc_dev, &iba, iicbus_print,
                   CFARGS(.iattr = "i2cbus"));
       }
#endif
}

void
auvitek_i2c_childdet(struct auvitek_softc *sc, device_t child)
{
       if (sc->sc_i2cdev == child)
               sc->sc_i2cdev = NULL;
}

static int
auvitek_i2c_exec(void *opaque, i2c_op_t op, i2c_addr_t addr,
   const void *cmd, size_t cmdlen, void *vbuf, size_t buflen, int flags)
{
       struct auvitek_softc *sc = opaque;

       if (I2C_OP_READ_P(op))
               return auvitek_i2c_read(sc, addr, vbuf, buflen);
       else
               return auvitek_i2c_write(sc, addr, cmd, cmdlen);
}

static int
auvitek_i2c_read(struct auvitek_softc *sc, i2c_addr_t addr,
   uint8_t *buf, size_t buflen)
{
       uint8_t v;
       unsigned int i;

       auvitek_write_1(sc, AU0828_REG_I2C_MBMODE, 1);
       auvitek_write_1(sc, AU0828_REG_I2C_CLKDIV, sc->sc_i2c_clkdiv);
       auvitek_write_1(sc, AU0828_REG_I2C_DSTADDR, addr << 1);

       if (buflen == 0) {
               auvitek_write_1(sc, AU0828_REG_I2C_TRIGGER,
                   AU0828_I2C_TRIGGER_RD);
               if (auvitek_i2c_wait_rdack(sc) == false)
                       return EBUSY;
               return 0;
       }

       for (i = 0; i < buflen; i++) {
               v = AU0828_I2C_TRIGGER_RD;
               if (i < (buflen - 1))
                       v |= AU0828_I2C_TRIGGER_HOLD;
               auvitek_write_1(sc, AU0828_REG_I2C_TRIGGER, v);

               if (auvitek_i2c_wait_rddone(sc) == false)
                       return EBUSY;

               buf[i] = auvitek_read_1(sc, AU0828_REG_I2C_FIFORD);
       }

       if (auvitek_i2c_wait(sc) == false)
               return EBUSY;

       return 0;
}

static int
auvitek_i2c_write(struct auvitek_softc *sc, i2c_addr_t addr,
   const uint8_t *buf, size_t buflen)
{
       uint8_t v;
       unsigned int i, fifolen;

       auvitek_write_1(sc, AU0828_REG_I2C_MBMODE, 1);
       auvitek_write_1(sc, AU0828_REG_I2C_CLKDIV, sc->sc_i2c_clkdiv);
       auvitek_write_1(sc, AU0828_REG_I2C_DSTADDR, addr << 1);

       if (buflen == 0) {
               auvitek_write_1(sc, AU0828_REG_I2C_TRIGGER,
                   AU0828_I2C_TRIGGER_RD);
               if (auvitek_i2c_wait(sc) == false)
                       return EBUSY;
               if (auvitek_i2c_wait_rdack(sc) == false)
                       return EBUSY;
               return 0;
       }

       fifolen = 0;
       for (i = 0; i < buflen; i++) {
               v = AU0828_I2C_TRIGGER_WR;
               if (i < (buflen - 1))
                       v |= AU0828_I2C_TRIGGER_HOLD;

               auvitek_write_1(sc, AU0828_REG_I2C_FIFOWR, buf[i]);
               ++fifolen;

               if (fifolen == 4 || i == (buflen - 1)) {
                       auvitek_write_1(sc, AU0828_REG_I2C_TRIGGER, v);
                       fifolen = 0;

                       if (auvitek_i2c_wait_wrdone(sc) == false)
                               return EBUSY;
               }
       }

       if (auvitek_i2c_wait(sc) == false)
               return EBUSY;

       return 0;
}

static bool
auvitek_i2c_wait(struct auvitek_softc *sc)
{
       uint8_t status;
       int retry = 1000;

       while (--retry > 0) {
               status = auvitek_read_1(sc, AU0828_REG_I2C_STATUS);
               if (!(status & AU0828_I2C_STATUS_BUSY))
                       break;
               delay(10);
       }
       if (retry == 0)
               return false;

       return true;
}

static bool
auvitek_i2c_wait_rdack(struct auvitek_softc *sc)
{
       uint8_t status;
       int retry = 1000;

       while (--retry > 0) {
               status = auvitek_read_1(sc, AU0828_REG_I2C_STATUS);
               if (!(status & AU0828_I2C_STATUS_NO_RD_ACK))
                       break;
               delay(10);
       }
       if (retry == 0)
               return false;

       return true;
}

static bool
auvitek_i2c_wait_rddone(struct auvitek_softc *sc)
{
       uint8_t status;
       int retry = 1000;

       while (--retry > 0) {
               status = auvitek_read_1(sc, AU0828_REG_I2C_STATUS);
               if (status & AU0828_I2C_STATUS_RD_DONE)
                       break;
               delay(10);
       }
       if (retry == 0)
               return false;

       return true;
}

static bool
auvitek_i2c_wait_wrdone(struct auvitek_softc *sc)
{
       uint8_t status;
       int retry = 1000;

       while (--retry > 0) {
               status = auvitek_read_1(sc, AU0828_REG_I2C_STATUS);
               if (status & AU0828_I2C_STATUS_WR_DONE)
                       break;
               delay(10);
       }
       if (retry == 0)
               return false;

       return true;
}

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