215 lines
6.2 KiB
C
215 lines
6.2 KiB
C
/* $NetBSD: pcf8563.c,v 1.8 2017/10/07 20:18:16 jmcneill Exp $ */
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/*
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* Copyright (c) 2011 Jonathan A. Kollasch
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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 COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/* XXX */
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#if defined(__arm__) || defined(__aarch64__)
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#include "opt_fdt.h"
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#endif
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: pcf8563.c,v 1.8 2017/10/07 20:18:16 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/kernel.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/pcf8563reg.h>
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#ifdef FDT
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#include <dev/fdt/fdtvar.h>
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#endif
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static const char *compatible[] = {
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"nxp,pcf8563",
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"pcf8563rtc",
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NULL
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};
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struct pcf8563rtc_softc {
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device_t sc_dev;
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i2c_tag_t sc_tag;
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int sc_addr;
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struct todr_chip_handle sc_todr;
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};
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static int pcf8563rtc_match(device_t, cfdata_t, void *);
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static void pcf8563rtc_attach(device_t, device_t, void *);
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CFATTACH_DECL_NEW(pcf8563rtc, sizeof(struct pcf8563rtc_softc),
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pcf8563rtc_match, pcf8563rtc_attach, NULL, NULL);
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static int pcf8563rtc_clock_read(struct pcf8563rtc_softc *, struct clock_ymdhms *);
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static int pcf8563rtc_clock_write(struct pcf8563rtc_softc *, struct clock_ymdhms *);
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static int pcf8563rtc_gettime(struct todr_chip_handle *, struct clock_ymdhms *);
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static int pcf8563rtc_settime(struct todr_chip_handle *, struct clock_ymdhms *);
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static int
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pcf8563rtc_match(device_t parent, cfdata_t cf, void *aux)
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{
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struct i2c_attach_args *ia = aux;
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if (ia->ia_name) {
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/* direct config - check name */
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return iic_compat_match(ia, compatible);
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} else {
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/* indirect config - check typical address */
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if (ia->ia_addr == PCF8563_ADDR)
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return 1;
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}
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return 0;
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}
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static void
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pcf8563rtc_attach(device_t parent, device_t self, void *aux)
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{
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struct pcf8563rtc_softc *sc = device_private(self);
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struct i2c_attach_args *ia = aux;
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aprint_naive(": Real-time Clock\n");
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aprint_normal(": NXP PCF8563 Real-time Clock\n");
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sc->sc_dev = self;
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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_todr.cookie = sc;
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sc->sc_todr.todr_gettime_ymdhms = pcf8563rtc_gettime;
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sc->sc_todr.todr_settime_ymdhms = pcf8563rtc_settime;
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sc->sc_todr.todr_setwen = NULL;
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iic_acquire_bus(sc->sc_tag, I2C_F_POLL);
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iic_smbus_write_byte(sc->sc_tag, sc->sc_addr, PCF8563_R_CS1, 0,
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I2C_F_POLL);
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iic_smbus_write_byte(sc->sc_tag, sc->sc_addr, PCF8563_R_CS2, 0,
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I2C_F_POLL);
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iic_release_bus(sc->sc_tag, I2C_F_POLL);
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#ifdef FDT
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fdtbus_todr_attach(self, ia->ia_cookie, &sc->sc_todr);
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#else
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todr_attach(&sc->sc_todr);
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#endif
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}
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static int
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pcf8563rtc_gettime(struct todr_chip_handle *ch, struct clock_ymdhms *dt)
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{
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struct pcf8563rtc_softc *sc = ch->cookie;
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if (pcf8563rtc_clock_read(sc, dt) == 0)
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return -1;
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return 0;
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}
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static int
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pcf8563rtc_settime(struct todr_chip_handle *ch, struct clock_ymdhms *dt)
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{
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struct pcf8563rtc_softc *sc = ch->cookie;
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if (pcf8563rtc_clock_write(sc, dt) == 0)
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return -1;
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return 0;
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}
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static int
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pcf8563rtc_clock_read(struct pcf8563rtc_softc *sc, struct clock_ymdhms *dt)
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{
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uint8_t bcd[PCF8563_NREGS];
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uint8_t reg = PCF8563_R_SECOND;
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const int flags = I2C_F_POLL;
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if (iic_acquire_bus(sc->sc_tag, flags)) {
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device_printf(sc->sc_dev, "acquire bus for read failed\n");
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return 0;
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}
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if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_addr, ®, 1,
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&bcd[reg], PCF8563_R_YEAR - reg + 1, flags)) {
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iic_release_bus(sc->sc_tag, flags);
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device_printf(sc->sc_dev, "read failed\n");
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return 0;
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}
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iic_release_bus(sc->sc_tag, flags);
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if (bcd[PCF8563_R_SECOND] & PCF8563_M_VL)
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return 0;
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dt->dt_sec = bcdtobin(bcd[PCF8563_R_SECOND] & PCF8563_M_SECOND);
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dt->dt_min = bcdtobin(bcd[PCF8563_R_MINUTE] & PCF8563_M_MINUTE);
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dt->dt_hour = bcdtobin(bcd[PCF8563_R_HOUR] & PCF8563_M_HOUR);
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dt->dt_day = bcdtobin(bcd[PCF8563_R_DAY] & PCF8563_M_DAY);
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dt->dt_wday = bcdtobin(bcd[PCF8563_R_WEEKDAY] & PCF8563_M_WEEKDAY);
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dt->dt_mon = bcdtobin(bcd[PCF8563_R_MONTH] & PCF8563_M_MONTH);
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dt->dt_year = 1900 +
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(bcdtobin(bcd[PCF8563_R_YEAR] & PCF8563_M_YEAR) % 100);
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if ((bcd[PCF8563_R_MONTH] & PCF8563_M_CENTURY) == 0)
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dt->dt_year += 100;
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return 1;
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}
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static int
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pcf8563rtc_clock_write(struct pcf8563rtc_softc *sc, struct clock_ymdhms *dt)
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{
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uint8_t bcd[PCF8563_NREGS];
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uint8_t reg = PCF8563_R_SECOND;
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const int flags = I2C_F_POLL;
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bcd[PCF8563_R_SECOND] = bintobcd(dt->dt_sec);
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bcd[PCF8563_R_MINUTE] = bintobcd(dt->dt_min);
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bcd[PCF8563_R_HOUR] = bintobcd(dt->dt_hour);
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bcd[PCF8563_R_DAY] = bintobcd(dt->dt_day);
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bcd[PCF8563_R_WEEKDAY] = bintobcd(dt->dt_wday);
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bcd[PCF8563_R_MONTH] = bintobcd(dt->dt_mon);
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bcd[PCF8563_R_YEAR] = bintobcd(dt->dt_year % 100);
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if (dt->dt_year < 2000)
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bcd[PCF8563_R_MONTH] |= PCF8563_M_CENTURY;
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if (iic_acquire_bus(sc->sc_tag, flags)) {
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device_printf(sc->sc_dev, "acquire bus for write failed\n");
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return 0;
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}
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if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, sc->sc_addr, ®, 1,
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&bcd[reg], PCF8563_R_YEAR - reg + 1, flags)) {
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iic_release_bus(sc->sc_tag, flags);
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device_printf(sc->sc_dev, "write failed\n");
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return 0;
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}
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iic_release_bus(sc->sc_tag, flags);
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return 1;
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}
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