152 lines
4.3 KiB
C
152 lines
4.3 KiB
C
/* $NetBSD: emdtv_i2c.c,v 1.1 2011/07/11 18:02:04 jmcneill Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 2008, 2010 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 <sys/cdefs.h>
|
|
__KERNEL_RCSID(0, "$NetBSD: emdtv_i2c.c,v 1.1 2011/07/11 18:02:04 jmcneill 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_acquire_bus(void *, int);
|
|
static void emdtv_i2c_release_bus(void *, int);
|
|
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)
|
|
{
|
|
mutex_init(&sc->sc_i2c_lock, MUTEX_DEFAULT, IPL_VM);
|
|
sc->sc_i2c.ic_cookie = sc;
|
|
sc->sc_i2c.ic_acquire_bus = emdtv_i2c_acquire_bus;
|
|
sc->sc_i2c.ic_release_bus = emdtv_i2c_release_bus;
|
|
sc->sc_i2c.ic_exec = emdtv_i2c_exec;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
emdtv_i2c_detach(struct emdtv_softc *sc, int flags)
|
|
{
|
|
mutex_destroy(&sc->sc_i2c_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
emdtv_i2c_acquire_bus(void *opaque, int flags)
|
|
{
|
|
struct emdtv_softc *sc = opaque;
|
|
|
|
mutex_enter(&sc->sc_i2c_lock);
|
|
|
|
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 void
|
|
emdtv_i2c_release_bus(void *opaque, int flags)
|
|
{
|
|
struct emdtv_softc *sc = opaque;
|
|
|
|
mutex_exit(&sc->sc_i2c_lock);
|
|
}
|
|
|
|
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;
|
|
}
|