236 lines
6.8 KiB
C
236 lines
6.8 KiB
C
/* $NetBSD: s390.c,v 1.7 2021/01/30 17:38:57 thorpej Exp $ */
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/*-
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* Copyright (c) 2011 Frank Wille.
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* All rights reserved.
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*
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* Written by Frank Wille for The NetBSD Project.
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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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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: s390.c,v 1.7 2021/01/30 17:38:57 thorpej 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 <dev/clock_subr.h>
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#include <dev/i2c/i2cvar.h>
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#include <dev/i2c/s390reg.h>
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struct s390rtc_softc {
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device_t sc_dev;
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i2c_tag_t sc_tag;
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i2c_addr_t sc_addr;
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struct todr_chip_handle sc_todr;
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};
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static int s390rtc_match(device_t, cfdata_t, void *);
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static void s390rtc_attach(device_t, device_t, void *);
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CFATTACH_DECL_NEW(s390rtc, sizeof(struct s390rtc_softc),
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s390rtc_match, s390rtc_attach, NULL, NULL);
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static int s390rtc_gettime_ymdhms(struct todr_chip_handle *,
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struct clock_ymdhms *);
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static int s390rtc_settime_ymdhms(struct todr_chip_handle *,
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struct clock_ymdhms *);
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static int s390rtc_read(struct s390rtc_softc *, int, uint8_t *, size_t);
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static int s390rtc_write(struct s390rtc_softc *, int, uint8_t *, size_t);
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static uint8_t bitreverse(uint8_t);
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static const struct device_compatible_entry compat_data[] = {
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{ .compat = "sii,s35390a" },
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DEVICE_COMPAT_EOL
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};
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static int
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s390rtc_match(device_t parent, cfdata_t cf, void *arg)
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{
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struct i2c_attach_args *ia = arg;
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int match_result;
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if (iic_use_direct_match(ia, cf, compat_data, &match_result))
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return match_result;
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/* indirect config - check typical address */
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if (ia->ia_addr == S390_ADDR)
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return I2C_MATCH_ADDRESS_ONLY;
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return 0;
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}
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static void
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s390rtc_attach(device_t parent, device_t self, void *arg)
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{
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struct s390rtc_softc *sc = device_private(self);
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struct i2c_attach_args *ia = arg;
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uint8_t reg[1];
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aprint_naive(": Real-time Clock\n");
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aprint_normal(": Seiko Instruments 35390A Real-time Clock\n");
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sc->sc_tag = ia->ia_tag;
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sc->sc_addr = ia->ia_addr;
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sc->sc_dev = self;
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/* Reset the chip and turn on 24h mode, after power-off or battery. */
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if (s390rtc_read(sc, S390_STATUS1, reg, sizeof(reg)))
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return;
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if (reg[0] & (S390_ST1_POC | S390_ST1_BLD)) {
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reg[0] |= S390_ST1_24H | S390_ST1_RESET;
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if (s390rtc_write(sc, S390_STATUS1, reg, sizeof(reg)))
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return;
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}
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/* Disable the test mode, when enabled. */
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if (s390rtc_read(sc, S390_STATUS2, reg, sizeof(reg)))
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return;
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if ((reg[0] & S390_ST2_TEST)) {
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reg[0] &= ~S390_ST2_TEST;
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if (s390rtc_write(sc, S390_STATUS2, reg, sizeof(reg)))
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return;
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}
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sc->sc_todr.cookie = sc;
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sc->sc_todr.todr_gettime = NULL;
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sc->sc_todr.todr_settime = NULL;
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sc->sc_todr.todr_gettime_ymdhms = s390rtc_gettime_ymdhms;
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sc->sc_todr.todr_settime_ymdhms = s390rtc_settime_ymdhms;
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sc->sc_todr.todr_setwen = NULL;
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todr_attach(&sc->sc_todr);
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}
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static int
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s390rtc_gettime_ymdhms(struct todr_chip_handle *ch, struct clock_ymdhms *dt)
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{
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struct s390rtc_softc *sc = ch->cookie;
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uint8_t bcd[S390_RT1_NBYTES];
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int error;
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if ((error = s390rtc_read(sc, S390_REALTIME1, bcd,
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S390_RT1_NBYTES)) != 0)
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return error;
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/*
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* Convert the register values into something useable.
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*/
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dt->dt_sec = bcdtobin(bcd[S390_RT1_SECOND]);
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dt->dt_min = bcdtobin(bcd[S390_RT1_MINUTE]);
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dt->dt_hour = bcdtobin(bcd[S390_RT1_HOUR] & 0x3f);
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dt->dt_day = bcdtobin(bcd[S390_RT1_DAY]);
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dt->dt_mon = bcdtobin(bcd[S390_RT1_MONTH]);
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dt->dt_year = bcdtobin(bcd[S390_RT1_YEAR]) + 2000;
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return 0;
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}
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static int
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s390rtc_settime_ymdhms(struct todr_chip_handle *ch, struct clock_ymdhms *dt)
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{
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struct s390rtc_softc *sc = ch->cookie;
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uint8_t bcd[S390_RT1_NBYTES];
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/*
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* Convert our time representation into something the S-xx390
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* can understand.
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*/
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bcd[S390_RT1_SECOND] = bintobcd(dt->dt_sec);
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bcd[S390_RT1_MINUTE] = bintobcd(dt->dt_min);
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bcd[S390_RT1_HOUR] = bintobcd(dt->dt_hour);
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bcd[S390_RT1_DAY] = bintobcd(dt->dt_day);
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bcd[S390_RT1_WDAY] = bintobcd(dt->dt_wday);
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bcd[S390_RT1_MONTH] = bintobcd(dt->dt_mon);
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bcd[S390_RT1_YEAR] = bintobcd(dt->dt_year % 100);
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return s390rtc_write(sc, S390_REALTIME1, bcd, S390_RT1_NBYTES);
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}
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static int
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s390rtc_read(struct s390rtc_softc *sc, int reg, uint8_t *buf, size_t len)
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{
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int i, error;
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if ((error = iic_acquire_bus(sc->sc_tag, 0)) != 0) {
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aprint_error_dev(sc->sc_dev,
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"%s: failed to acquire I2C bus\n", __func__);
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return error;
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}
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if ((error = iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
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sc->sc_addr + reg, NULL, 0, buf, len, 0)) != 0) {
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iic_release_bus(sc->sc_tag, 0);
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aprint_error_dev(sc->sc_dev,
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"%s: failed to read reg%d\n", __func__, reg);
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return error;
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}
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iic_release_bus(sc->sc_tag, 0);
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/* this chip returns each byte in reverse order */
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for (i = 0; i < len; i++)
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buf[i] = bitreverse(buf[i]);
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return 0;
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}
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static int
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s390rtc_write(struct s390rtc_softc *sc, int reg, uint8_t *buf, size_t len)
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{
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int i, error;
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if ((error = iic_acquire_bus(sc->sc_tag, 0)) != 0) {
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aprint_error_dev(sc->sc_dev,
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"%s: failed to acquire I2C bus\n", __func__);
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return error;
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}
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/* this chip expects each byte in reverse order */
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for (i = 0; i < len; i++)
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buf[i] = bitreverse(buf[i]);
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if ((error = iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP,
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sc->sc_addr + reg, NULL, 0, buf, len, 0)) != 0) {
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iic_release_bus(sc->sc_tag, 0);
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aprint_error_dev(sc->sc_dev,
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"%s: failed to write reg%d\n", __func__, reg);
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return error;
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}
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iic_release_bus(sc->sc_tag, 0);
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return 0;
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}
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static uint8_t
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bitreverse(uint8_t x)
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{
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static unsigned char nibbletab[16] = {
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0, 8, 4, 12, 2, 10, 6, 14, 1, 9, 5, 13, 3, 11, 7, 15
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};
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return (nibbletab[x & 15] << 4) | nibbletab[x >> 4];
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}
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