d974db0ada
This branch was a major cleanup and rototill of many of the various OEA cpu based PPC ports that focused on sharing as much code as possible between the various ports to eliminate near-identical copies of files in every tree. Additionally there is a new PIC system that unifies the interface to interrupt code for all different OEA ppc arches. The work for this branch was done by a variety of people, too long to list here. TODO: bebox still needs work to complete the transition to -renovation. ofppc still needs a bunch of work, which I will be looking at. ev64260 still needs to be renovated amigappc was not attempted. NOTES: pmppc was removed as an arch, and moved to a evbppc target.
442 lines
10 KiB
C
442 lines
10 KiB
C
/* $NetBSD: ki2c.c,v 1.10 2007/10/17 19:55:18 garbled Exp $ */
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/* Id: ki2c.c,v 1.7 2002/10/05 09:56:05 tsubai Exp */
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/*-
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* Copyright (c) 2001 Tsubai Masanari. 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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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <sys/device.h>
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#include <sys/systm.h>
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#include <dev/ofw/openfirm.h>
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#include <uvm/uvm_extern.h>
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#include <machine/autoconf.h>
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#include <macppc/dev/ki2cvar.h>
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int ki2c_match(struct device *, struct cfdata *, void *);
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void ki2c_attach(struct device *, struct device *, void *);
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inline u_int ki2c_readreg(struct ki2c_softc *, int);
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inline void ki2c_writereg(struct ki2c_softc *, int, u_int);
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u_int ki2c_getmode(struct ki2c_softc *);
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void ki2c_setmode(struct ki2c_softc *, u_int);
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u_int ki2c_getspeed(struct ki2c_softc *);
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void ki2c_setspeed(struct ki2c_softc *, u_int);
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int ki2c_intr(struct ki2c_softc *);
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int ki2c_poll(struct ki2c_softc *, int);
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int ki2c_start(struct ki2c_softc *, int, int, void *, int);
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int ki2c_read(struct ki2c_softc *, int, int, void *, int);
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int ki2c_write(struct ki2c_softc *, int, int, void *, int);
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int ki2c_print __P((void *, const char *));
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/* I2C glue */
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static int ki2c_i2c_acquire_bus(void *, int);
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static void ki2c_i2c_release_bus(void *, int);
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static int ki2c_i2c_exec(void *, i2c_op_t, i2c_addr_t, const void *, size_t,
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void *, size_t, int);
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CFATTACH_DECL(ki2c, sizeof(struct ki2c_softc), ki2c_match, ki2c_attach,
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NULL, NULL);
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int
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ki2c_match(parent, match, aux)
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struct device *parent;
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struct cfdata *match;
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void *aux;
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{
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struct confargs *ca = aux;
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if (strcmp(ca->ca_name, "i2c") == 0)
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return 1;
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return 0;
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}
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void
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ki2c_attach(parent, self, aux)
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struct device *parent;
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struct device *self;
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void *aux;
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{
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struct ki2c_softc *sc = (struct ki2c_softc *)self;
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struct confargs *ca = aux;
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int node = ca->ca_node;
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int rate, child, namelen, i2cbus;
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struct ki2c_confargs ka;
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struct i2cbus_attach_args iba;
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char name[32];
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u_int reg[20];
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ca->ca_reg[0] += ca->ca_baseaddr;
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if (OF_getprop(node, "AAPL,i2c-rate", &rate, 4) != 4) {
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printf(": cannot get i2c-rate\n");
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return;
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}
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if (OF_getprop(node, "AAPL,address", &sc->sc_reg, 4) != 4) {
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printf(": unable to find i2c address\n");
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return;
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}
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if (OF_getprop(node, "AAPL,address-step", &sc->sc_regstep, 4) != 4) {
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printf(": unable to find i2c address step\n");
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return;
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}
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printf("\n");
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ki2c_writereg(sc, STATUS, 0);
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ki2c_writereg(sc, ISR, 0);
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ki2c_writereg(sc, IER, 0);
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ki2c_setmode(sc, I2C_STDSUBMODE);
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ki2c_setspeed(sc, I2C_100kHz); /* XXX rate */
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lockinit(&sc->sc_buslock, PRIBIO|PCATCH, sc->sc_dev.dv_xname, 0, 0);
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ki2c_writereg(sc, IER,I2C_INT_DATA|I2C_INT_ADDR|I2C_INT_STOP);
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/* fill in the i2c tag */
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sc->sc_i2c.ic_cookie = sc;
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sc->sc_i2c.ic_acquire_bus = ki2c_i2c_acquire_bus;
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sc->sc_i2c.ic_release_bus = ki2c_i2c_release_bus;
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sc->sc_i2c.ic_send_start = NULL;
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sc->sc_i2c.ic_send_stop = NULL;
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sc->sc_i2c.ic_initiate_xfer = NULL;
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sc->sc_i2c.ic_read_byte = NULL;
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sc->sc_i2c.ic_write_byte = NULL;
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sc->sc_i2c.ic_exec = ki2c_i2c_exec;
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iba.iba_tag = &sc->sc_i2c;
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(void) config_found_ia(&sc->sc_dev, "i2cbus", &iba, iicbus_print);
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/*
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* newer OF puts I2C devices under 'i2c-bus' instead of attaching them
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* directly to the ki2c node so we just check if we have a child named
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* 'i2c-bus' and if so we attach its children, not ours
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*/
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i2cbus = 0;
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child = OF_child(node);
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while ((child != 0) && (i2cbus == 0)) {
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OF_getprop(child, "name", name, sizeof(name));
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if (strcmp(name, "i2c-bus") == 0)
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i2cbus = child;
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child = OF_peer(child);
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}
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if (i2cbus == 0)
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i2cbus = node;
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for (child = OF_child(i2cbus); child; child = OF_peer(child)) {
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int ok = 0;
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namelen = OF_getprop(child, "name", name, sizeof(name));
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if (namelen < 0)
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continue;
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if (namelen >= sizeof(name))
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continue;
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name[namelen] = 0;
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ka.ka_name = name;
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ka.ka_node = child;
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ok = OF_getprop(child, "reg", reg, sizeof(reg));
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if (ok <= 0) {
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ok = OF_getprop(child, "i2c-address", reg,
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sizeof(reg));
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}
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if (ok > 0) {
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ka.ka_addr = reg[0];
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ka.ka_tag = &sc->sc_i2c;
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config_found_ia(self, "ki2c", &ka, ki2c_print);
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}
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#ifdef DIAGNOSTIC
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else {
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printf("%s: device (%s) has no reg or i2c-address property.\n",
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sc->sc_dev.dv_xname, name);
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}
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#endif
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}
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}
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int
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ki2c_print(aux, ki2c)
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void *aux;
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const char *ki2c;
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{
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struct ki2c_confargs *ka = aux;
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if (ki2c) {
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aprint_normal("%s at %s", ka->ka_name, ki2c);
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aprint_normal(" address 0x%x", ka->ka_addr);
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}
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return UNCONF;
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}
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u_int
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ki2c_readreg(sc, reg)
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struct ki2c_softc *sc;
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int reg;
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{
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u_char *addr = sc->sc_reg + sc->sc_regstep * reg;
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return *addr;
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}
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void
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ki2c_writereg(sc, reg, val)
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struct ki2c_softc *sc;
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int reg;
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u_int val;
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{
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u_char *addr = sc->sc_reg + sc->sc_regstep * reg;
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*addr = val;
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__asm volatile ("eieio");
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delay(10);
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}
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u_int
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ki2c_getmode(sc)
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struct ki2c_softc *sc;
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{
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return ki2c_readreg(sc, MODE) & I2C_MODE;
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}
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void
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ki2c_setmode(sc, mode)
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struct ki2c_softc *sc;
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u_int mode;
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{
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u_int x;
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KASSERT((mode & ~I2C_MODE) == 0);
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x = ki2c_readreg(sc, MODE);
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x &= ~I2C_MODE;
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x |= mode;
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ki2c_writereg(sc, MODE, x);
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}
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u_int
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ki2c_getspeed(sc)
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struct ki2c_softc *sc;
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{
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return ki2c_readreg(sc, MODE) & I2C_SPEED;
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}
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void
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ki2c_setspeed(sc, speed)
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struct ki2c_softc *sc;
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u_int speed;
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{
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u_int x;
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KASSERT((speed & ~I2C_SPEED) == 0);
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x = ki2c_readreg(sc, MODE);
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x &= ~I2C_SPEED;
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x |= speed;
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ki2c_writereg(sc, MODE, x);
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}
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int
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ki2c_intr(sc)
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struct ki2c_softc *sc;
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{
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u_int isr, x;
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isr = ki2c_readreg(sc, ISR);
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if (isr & I2C_INT_ADDR) {
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#if 0
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if ((ki2c_readreg(sc, STATUS) & I2C_ST_LASTAAK) == 0) {
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/* No slave responded. */
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sc->sc_flags |= I2C_ERROR;
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goto out;
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}
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#endif
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if (sc->sc_flags & I2C_READING) {
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if (sc->sc_resid > 1) {
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x = ki2c_readreg(sc, CONTROL);
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x |= I2C_CT_AAK;
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ki2c_writereg(sc, CONTROL, x);
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}
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} else {
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ki2c_writereg(sc, DATA, *sc->sc_data++);
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sc->sc_resid--;
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}
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}
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if (isr & I2C_INT_DATA) {
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if (sc->sc_flags & I2C_READING) {
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*sc->sc_data++ = ki2c_readreg(sc, DATA);
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sc->sc_resid--;
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if (sc->sc_resid == 0) { /* Completed */
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ki2c_writereg(sc, CONTROL, 0);
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goto out;
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}
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} else {
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#if 0
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if ((ki2c_readreg(sc, STATUS) & I2C_ST_LASTAAK) == 0) {
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/* No slave responded. */
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sc->sc_flags |= I2C_ERROR;
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goto out;
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}
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#endif
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if (sc->sc_resid == 0) {
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x = ki2c_readreg(sc, CONTROL) | I2C_CT_STOP;
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ki2c_writereg(sc, CONTROL, x);
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} else {
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ki2c_writereg(sc, DATA, *sc->sc_data++);
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sc->sc_resid--;
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}
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}
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}
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out:
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if (isr & I2C_INT_STOP) {
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ki2c_writereg(sc, CONTROL, 0);
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sc->sc_flags &= ~I2C_BUSY;
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}
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ki2c_writereg(sc, ISR, isr);
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return 1;
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}
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int
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ki2c_poll(sc, timo)
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struct ki2c_softc *sc;
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int timo;
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{
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while (sc->sc_flags & I2C_BUSY) {
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if (ki2c_readreg(sc, ISR))
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ki2c_intr(sc);
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timo -= 100;
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if (timo < 0) {
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printf("i2c_poll: timeout\n");
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return -1;
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}
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delay(100);
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}
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return 0;
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}
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int
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ki2c_start(sc, addr, subaddr, data, len)
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struct ki2c_softc *sc;
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int addr, subaddr, len;
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void *data;
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{
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int rw = (sc->sc_flags & I2C_READING) ? 1 : 0;
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int timo, x;
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KASSERT((addr & 1) == 0);
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sc->sc_data = data;
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sc->sc_resid = len;
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sc->sc_flags |= I2C_BUSY;
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timo = 1000 + len * 200;
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/* XXX TAS3001 sometimes takes 50ms to finish writing registers. */
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/* if (addr == 0x68) */
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timo += 100000;
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ki2c_writereg(sc, ADDR, addr | rw);
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ki2c_writereg(sc, SUBADDR, subaddr);
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x = ki2c_readreg(sc, CONTROL) | I2C_CT_ADDR;
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ki2c_writereg(sc, CONTROL, x);
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if (ki2c_poll(sc, timo))
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return -1;
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if (sc->sc_flags & I2C_ERROR) {
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printf("I2C_ERROR\n");
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return -1;
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}
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return 0;
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}
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int
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ki2c_read(sc, addr, subaddr, data, len)
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struct ki2c_softc *sc;
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int addr, subaddr, len;
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void *data;
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{
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sc->sc_flags = I2C_READING;
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#ifdef KI2C_DEBUG
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printf("ki2c_read: %02x %d\n", addr, len);
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#endif
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return ki2c_start(sc, addr, subaddr, data, len);
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}
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int
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ki2c_write(sc, addr, subaddr, data, len)
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struct ki2c_softc *sc;
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int addr, subaddr, len;
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void *data;
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{
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sc->sc_flags = 0;
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#ifdef KI2C_DEBUG
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printf("ki2c_write: %02x %d\n",addr,len);
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#endif
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return ki2c_start(sc, addr, subaddr, data, len);
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}
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static int
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ki2c_i2c_acquire_bus(void *cookie, int flags)
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{
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struct ki2c_softc *sc = cookie;
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return (lockmgr(&sc->sc_buslock, LK_EXCLUSIVE, NULL));
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}
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static void
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ki2c_i2c_release_bus(void *cookie, int flags)
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{
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struct ki2c_softc *sc = cookie;
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(void) lockmgr(&sc->sc_buslock, LK_RELEASE, NULL);
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}
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int
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ki2c_i2c_exec(void *cookie, i2c_op_t op, i2c_addr_t addr, const void *vcmd,
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size_t cmdlen, void *vbuf, size_t buflen, int flags)
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{
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struct ki2c_softc *sc = cookie;
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/* we handle the subaddress stuff ourselves */
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ki2c_setmode(sc, I2C_STDMODE);
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if (ki2c_write(sc, addr, 0, __UNCONST(vcmd), cmdlen) !=0 )
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return -1;
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if (I2C_OP_READ_P(op)) {
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if (ki2c_read(sc, addr, 0, vbuf, buflen) !=0 )
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return -1;
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}
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return 0;
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}
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