Add pcf8563rtc(4), yet another I2C real time clock.
This commit is contained in:
jakllsch
parent
609720ff85
commit
2ecc058a1c
@ -1,4 +1,4 @@
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# $NetBSD: files.i2c,v 1.31 2011/01/04 01:24:56 matt Exp $
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# $NetBSD: files.i2c,v 1.32 2011/01/21 19:11:47 jakllsch Exp $
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defflag opt_i2cbus.h I2C_SCAN
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define i2cbus { }
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@ -48,6 +48,11 @@ device maxrtc
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attach maxrtc at iic
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file dev/i2c/max6900.c maxrtc
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# NXP/Philips PCF8563 Real Time Clock
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device pcf8563rtc
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attach pcf8563rtc at iic
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file dev/i2c/pcf8563.c pcf8563rtc
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# Philips PCF8583 Real Time Clock
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device pcfrtc
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attach pcfrtc at iic
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182
sys/dev/i2c/pcf8563.c
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182
sys/dev/i2c/pcf8563.c
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/* $NetBSD: pcf8563.c,v 1.1 2011/01/21 19:11:47 jakllsch 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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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: pcf8563.c,v 1.1 2011/01/21 19:11:47 jakllsch 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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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 timeval *);
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static int pcf8563rtc_settime(struct todr_chip_handle *, struct timeval *);
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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_addr == PCF8563_ADDR)
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return 1;
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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 = pcf8563rtc_gettime;
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sc->sc_todr.todr_settime = pcf8563rtc_settime;
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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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pcf8563rtc_gettime(struct todr_chip_handle *ch, struct timeval *tv)
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{
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struct pcf8563rtc_softc *sc = ch->cookie;
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struct clock_ymdhms dt;
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memset(&dt, 0, sizeof(dt));
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if (pcf8563rtc_clock_read(sc, &dt) == 0)
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return -1;
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tv->tv_sec = clock_ymdhms_to_secs(&dt);
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tv->tv_usec = 0;
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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 timeval *tv)
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{
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struct pcf8563rtc_softc *sc = ch->cookie;
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struct clock_ymdhms dt;
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clock_secs_to_ymdhms(tv->tv_sec, &dt);
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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_CS1;
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if (iic_acquire_bus(sc->sc_tag, I2C_F_POLL)) {
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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, I2C_F_POLL)) {
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iic_release_bus(sc->sc_tag, I2C_F_POLL);
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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, I2C_F_POLL);
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dt->dt_sec = FROMBCD(bcd[PCF8563_R_SECOND] & PCF8563_M_SECOND);
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dt->dt_min = FROMBCD(bcd[PCF8563_R_MINUTE] & PCF8563_M_MINUTE);
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dt->dt_hour = FROMBCD(bcd[PCF8563_R_HOUR] & PCF8563_M_HOUR);
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dt->dt_day = FROMBCD(bcd[PCF8563_R_DAY] & PCF8563_M_DAY);
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dt->dt_mon = FROMBCD(bcd[PCF8563_R_MONTH] & PCF8563_M_MONTH);
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dt->dt_year = FROMBCD(bcd[PCF8563_R_YEAR] & PCF8563_M_YEAR);
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dt->dt_year += 2000;
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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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bcd[PCF8563_R_SECOND] = TOBCD(dt->dt_sec);
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bcd[PCF8563_R_MINUTE] = TOBCD(dt->dt_min);
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bcd[PCF8563_R_HOUR] = TOBCD(dt->dt_hour);
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bcd[PCF8563_R_DAY] = TOBCD(dt->dt_day);
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bcd[PCF8563_R_WEEKDAY] = TOBCD(dt->dt_wday);
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bcd[PCF8563_R_MONTH] = TOBCD(dt->dt_mon);
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bcd[PCF8563_R_YEAR] = TOBCD(dt->dt_year % 100);
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if (iic_acquire_bus(sc->sc_tag, I2C_F_POLL)) {
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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, I2C_F_POLL)) {
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iic_release_bus(sc->sc_tag, I2C_F_POLL);
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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, I2C_F_POLL);
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return 1;
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}
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53
sys/dev/i2c/pcf8563reg.h
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53
sys/dev/i2c/pcf8563reg.h
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/* $NetBSD: pcf8563reg.h,v 1.1 2011/01/21 19:11:47 jakllsch Exp $ */
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/*
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* Jonathan Kollasch, 2011
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*
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* This file is in the public domain.
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*/
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/*
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* NXP (Philips) PCF8563 RTC registers
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*/
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/* We only have clock mode registers here */
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#ifndef _PCF8563REG_H_
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#define _PCF8563REG_H_
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/*
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* PCF8563 RTC I2C address:
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*
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* 101 0001
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*/
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#define PCF8563_ADDR 0x51
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#define PCF8563_R_CS1 0x00
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#define PCF8563_R_CS2 0x01
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#define PCF8563_R_SECOND 0x02
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#define PCF8563_R_MINUTE 0x03
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#define PCF8563_R_HOUR 0x04
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#define PCF8563_R_DAY 0x05
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#define PCF8563_R_WEEKDAY 0x06
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#define PCF8563_R_MONTH 0x07
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#define PCF8563_R_YEAR 0x08
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#define PCF8563_R_MINUTE_ALARM 0x09
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#define PCF8563_R_HOUR_ALARM 0x0a
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#define PCF8563_R_DAY_ALARM 0x0b
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#define PCF8563_R_WEEKDAY_ALARM 0x0c
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#define PCF8563_R_CLKOUT_CNTRL 0x0d
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#define PCF8563_R_TIMER_CNTRL 0x0e
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#define PCF8563_R_TIMER 0x0f
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#define PCF8563_NREGS 0x10
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#define PCF8563_M_SECOND 0x7f
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#define PCF8563_M_MINUTE 0x7f
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#define PCF8563_M_HOUR 0x3f
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#define PCF8563_M_DAY 0x3f
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#define PCF8563_M_WEEKDAY 0x07
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#define PCF8563_M_MONTH 0x1f
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#define PCF8563_M_CENTURY 0x80
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#define PCF8563_M_YEAR 0xff
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#endif /* _PCF8563REG_H_ */
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