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NetBSD/sys/dev/usb/auvitek_i2c.c

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/* $NetBSD: auvitek_i2c.c,v 1.3 2011/10/02 16:30:58 jmcneill Exp $ */
/*-
* Copyright (c) 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.
*/
/*
* Auvitek AU0828 USB controller - I2C access ops
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: auvitek_i2c.c,v 1.3 2011/10/02 16:30:58 jmcneill Exp $");
#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_acquire_bus(void *, int);
static void auvitek_i2c_release_bus(void *, int);
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)
{
mutex_init(&sc->sc_i2c_lock, MUTEX_DEFAULT, IPL_NONE);
sc->sc_i2c.ic_cookie = sc;
sc->sc_i2c.ic_acquire_bus = auvitek_i2c_acquire_bus;
sc->sc_i2c.ic_release_bus = auvitek_i2c_release_bus;
sc->sc_i2c.ic_exec = auvitek_i2c_exec;
auvitek_i2c_rescan(sc, NULL, NULL);
return 0;
}
int
auvitek_i2c_detach(struct auvitek_softc *sc, int flags)
{
mutex_destroy(&sc->sc_i2c_lock);
if (sc->sc_i2cdev)
config_detach(sc->sc_i2cdev, flags);
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_type = I2C_TYPE_SMBUS;
iba.iba_tag = &sc->sc_i2c;
sc->sc_i2cdev = config_found_ia(sc->sc_dev, "i2cbus",
&iba, iicbus_print);
}
#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_acquire_bus(void *opaque, int flags)
{
struct auvitek_softc *sc = opaque;
if (flags & I2C_F_POLL) {
if (!mutex_tryenter(&sc->sc_i2c_lock))
return EBUSY;
} else {
mutex_enter(&sc->sc_i2c_lock);
}
return 0;
}
static void
auvitek_i2c_release_bus(void *opaque, int flags)
{
struct auvitek_softc *sc = opaque;
mutex_exit(&sc->sc_i2c_lock);
}
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;
//KASSERT(mutex_owned(&sc->sc_i2c_lock));
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;
//KASSERT(mutex_owned(&sc->sc_i2c_lock));
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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