/* $NetBSD: emdtv_i2c.c,v 1.2 2019/12/22 23:23:32 thorpej Exp $ */

/* $NetBSD: emdtv_i2c.c,v 1.2 2019/12/22 23:23:32 thorpej Exp $ */

/*-
* Copyright (c) 2008, 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.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: emdtv_i2c.c,v 1.2 2019/12/22 23:23:32 thorpej Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/conf.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/emdtvvar.h>
#include <dev/usb/emdtvreg.h>

static int emdtv_i2c_exec(void *, i2c_op_t, i2c_addr_t,
const void *, size_t, void *, size_t, int);

static int emdtv_i2c_check(struct emdtv_softc *, i2c_addr_t);
static int emdtv_i2c_recv(struct emdtv_softc *, i2c_addr_t,
uint8_t *, size_t);
static int emdtv_i2c_send(struct emdtv_softc *, i2c_addr_t,
const uint8_t *, size_t, bool);

int
emdtv_i2c_attach(struct emdtv_softc *sc)
{
iic_tag_init(&sc->sc_i2c);
sc->sc_i2c.ic_cookie = sc;
sc->sc_i2c.ic_exec = emdtv_i2c_exec;

return 0;
}

int
emdtv_i2c_detach(struct emdtv_softc *sc, int flags)
{
iic_tag_fini(&sc->sc_i2c);

return 0;
}

static int
emdtv_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 emdtv_softc *sc = opaque;
int error;

if (I2C_OP_READ_P(op)) {
if (buflen == 0)
error = emdtv_i2c_check(sc, addr);
else
error = emdtv_i2c_recv(sc, addr, vbuf, buflen);
} else {
error = emdtv_i2c_send(sc, addr, cmd, cmdlen,
I2C_OP_STOP_P(op));
error = 0;
}

return error;
}

static int
emdtv_i2c_check(struct emdtv_softc *sc, i2c_addr_t addr)
{
emdtv_read_1(sc, EM28XX_UR_I2C, addr);
if (emdtv_read_1(sc, UR_GET_STATUS, EM28XX_REG_I2C_STATUS) != 0) {
device_printf(sc->sc_dev, "%s failed\n", __func__);
return ENXIO;
}
return 0;
}

static int
emdtv_i2c_recv(struct emdtv_softc *sc, i2c_addr_t addr, uint8_t *datap,
size_t len)
{
emdtv_read_multi_1(sc, EM28XX_UR_I2C, addr, datap, len);
if (emdtv_read_1(sc, UR_GET_STATUS, EM28XX_REG_I2C_STATUS) != 0) {
device_printf(sc->sc_dev, "%s failed\n", __func__);
return ENXIO;
}
return 0;
}

static int
emdtv_i2c_send(struct emdtv_softc *sc, i2c_addr_t addr, const uint8_t *datap,
size_t len, bool stop)
{
int off = (stop == false ? 1 : 0);
emdtv_write_multi_1(sc, EM28XX_UR_I2C + off, addr, datap, len);
if (emdtv_read_1(sc, UR_GET_STATUS, EM28XX_REG_I2C_STATUS) != 0) {
device_printf(sc->sc_dev, "%s failed\n", __func__);
return ENXIO;
}
return 0;
}