274 lines
6.6 KiB
C
274 lines
6.6 KiB
C
/* $NetBSD: auvitek_i2c.c,v 1.1 2010/12/27 15:42:11 jmcneill Exp $ */
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/*-
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* Copyright (c) 2010 Jared D. McNeill <jmcneill@invisible.ca>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Auvitek AU0828 USB controller - I2C access ops
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: auvitek_i2c.c,v 1.1 2010/12/27 15:42:11 jmcneill Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/device.h>
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#include <sys/conf.h>
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#include <sys/bus.h>
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#include <sys/module.h>
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#include <dev/usb/usb.h>
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#include <dev/usb/usbdi.h>
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#include <dev/usb/usbdi_util.h>
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#include <dev/usb/usbdevs.h>
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#include <dev/i2c/i2cvar.h>
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#include <dev/usb/auvitekreg.h>
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#include <dev/usb/auvitekvar.h>
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static int auvitek_i2c_acquire_bus(void *, int);
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static void auvitek_i2c_release_bus(void *, int);
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static int auvitek_i2c_exec(void *, i2c_op_t, i2c_addr_t,
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const void *, size_t, void *, size_t, int);
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static int auvitek_i2c_read(struct auvitek_softc *, i2c_addr_t,
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uint8_t *, size_t);
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static int auvitek_i2c_write(struct auvitek_softc *, i2c_addr_t,
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const uint8_t *, size_t);
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static bool auvitek_i2c_wait(struct auvitek_softc *);
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static bool auvitek_i2c_wait_rdack(struct auvitek_softc *);
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static bool auvitek_i2c_wait_rddone(struct auvitek_softc *);
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static bool auvitek_i2c_wait_wrdone(struct auvitek_softc *);
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int
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auvitek_i2c_attach(struct auvitek_softc *sc)
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{
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mutex_init(&sc->sc_i2c_lock, MUTEX_DEFAULT, IPL_VM);
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sc->sc_i2c.ic_cookie = sc;
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sc->sc_i2c.ic_acquire_bus = auvitek_i2c_acquire_bus;
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sc->sc_i2c.ic_release_bus = auvitek_i2c_release_bus;
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sc->sc_i2c.ic_exec = auvitek_i2c_exec;
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return 0;
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}
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int
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auvitek_i2c_detach(struct auvitek_softc *sc, int flags)
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{
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mutex_destroy(&sc->sc_i2c_lock);
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return 0;
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}
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static int
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auvitek_i2c_acquire_bus(void *opaque, int flags)
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{
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struct auvitek_softc *sc = opaque;
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mutex_enter(&sc->sc_i2c_lock);
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return 0;
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}
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static void
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auvitek_i2c_release_bus(void *opaque, int flags)
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{
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struct auvitek_softc *sc = opaque;
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mutex_exit(&sc->sc_i2c_lock);
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}
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static int
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auvitek_i2c_exec(void *opaque, i2c_op_t op, i2c_addr_t addr,
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const void *cmd, size_t cmdlen, void *vbuf, size_t buflen, int flags)
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{
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struct auvitek_softc *sc = opaque;
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if (I2C_OP_READ_P(op))
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return auvitek_i2c_read(sc, addr, vbuf, buflen);
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else
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return auvitek_i2c_write(sc, addr, cmd, cmdlen);
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}
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static int
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auvitek_i2c_read(struct auvitek_softc *sc, i2c_addr_t addr,
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uint8_t *buf, size_t buflen)
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{
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uint8_t v;
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unsigned int i;
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KASSERT(mutex_owned(&sc->sc_i2c_lock));
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auvitek_write_1(sc, AU0828_REG_I2C_MBMODE, 1);
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auvitek_write_1(sc, AU0828_REG_I2C_CLKDIV, sc->sc_i2c_clkdiv);
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auvitek_write_1(sc, AU0828_REG_I2C_DSTADDR, addr << 1);
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if (buflen == 0) {
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auvitek_write_1(sc, AU0828_REG_I2C_TRIGGER,
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AU0828_I2C_TRIGGER_RD);
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if (auvitek_i2c_wait_rdack(sc) == false)
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return EBUSY;
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return 0;
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}
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for (i = 0; i < buflen; i++) {
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v = AU0828_I2C_TRIGGER_RD;
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if (i < (buflen - 1))
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v |= AU0828_I2C_TRIGGER_HOLD;
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auvitek_write_1(sc, AU0828_REG_I2C_TRIGGER, v);
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if (auvitek_i2c_wait_rddone(sc) == false)
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return EBUSY;
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buf[i] = auvitek_read_1(sc, AU0828_REG_I2C_FIFORD);
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}
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if (auvitek_i2c_wait(sc) == false)
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return EBUSY;
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return 0;
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}
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static int
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auvitek_i2c_write(struct auvitek_softc *sc, i2c_addr_t addr,
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const uint8_t *buf, size_t buflen)
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{
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uint8_t v;
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unsigned int i, fifolen;
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KASSERT(mutex_owned(&sc->sc_i2c_lock));
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auvitek_write_1(sc, AU0828_REG_I2C_MBMODE, 1);
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auvitek_write_1(sc, AU0828_REG_I2C_CLKDIV, sc->sc_i2c_clkdiv);
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auvitek_write_1(sc, AU0828_REG_I2C_DSTADDR, addr << 1);
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if (buflen == 0) {
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auvitek_write_1(sc, AU0828_REG_I2C_TRIGGER,
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AU0828_I2C_TRIGGER_RD);
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if (auvitek_i2c_wait(sc) == false)
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return EBUSY;
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if (auvitek_i2c_wait_rdack(sc) == false)
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return EBUSY;
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return 0;
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}
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fifolen = 0;
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for (i = 0; i < buflen; i++) {
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v = AU0828_I2C_TRIGGER_WR;
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if (i < (buflen - 1))
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v |= AU0828_I2C_TRIGGER_HOLD;
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auvitek_write_1(sc, AU0828_REG_I2C_FIFOWR, buf[i]);
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++fifolen;
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if (fifolen == 4 || i == (buflen - 1)) {
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auvitek_write_1(sc, AU0828_REG_I2C_TRIGGER, v);
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fifolen = 0;
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if (auvitek_i2c_wait_wrdone(sc) == false)
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return EBUSY;
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}
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}
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if (auvitek_i2c_wait(sc) == false)
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return EBUSY;
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return 0;
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}
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static bool
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auvitek_i2c_wait(struct auvitek_softc *sc)
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{
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uint8_t status;
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int retry = 1000;
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while (--retry > 0) {
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status = auvitek_read_1(sc, AU0828_REG_I2C_STATUS);
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if (!(status & AU0828_I2C_STATUS_BUSY))
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break;
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delay(10);
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}
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if (retry == 0)
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return false;
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return true;
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}
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static bool
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auvitek_i2c_wait_rdack(struct auvitek_softc *sc)
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{
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uint8_t status;
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int retry = 1000;
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while (--retry > 0) {
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status = auvitek_read_1(sc, AU0828_REG_I2C_STATUS);
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if (!(status & AU0828_I2C_STATUS_NO_RD_ACK))
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break;
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delay(10);
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}
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if (retry == 0)
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return false;
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return true;
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}
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static bool
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auvitek_i2c_wait_rddone(struct auvitek_softc *sc)
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{
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uint8_t status;
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int retry = 1000;
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while (--retry > 0) {
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status = auvitek_read_1(sc, AU0828_REG_I2C_STATUS);
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if (status & AU0828_I2C_STATUS_RD_DONE)
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break;
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delay(10);
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}
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if (retry == 0)
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return false;
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return true;
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}
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static bool
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auvitek_i2c_wait_wrdone(struct auvitek_softc *sc)
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{
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uint8_t status;
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int retry = 1000;
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while (--retry > 0) {
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status = auvitek_read_1(sc, AU0828_REG_I2C_STATUS);
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if (status & AU0828_I2C_STATUS_WR_DONE)
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break;
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delay(10);
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}
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if (retry == 0)
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return false;
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return true;
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}
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