Home | History | Annotate | Line # | Download | only in i2c
pcf8583.c revision 1.10.2.1
      1  1.10.2.1  wrstuden /*	$NetBSD: pcf8583.c,v 1.10.2.1 2008/06/23 04:31:02 wrstuden Exp $	*/
      2       1.1   thorpej 
      3       1.1   thorpej /*
      4       1.1   thorpej  * Copyright (c) 2003 Wasabi Systems, Inc.
      5       1.1   thorpej  * All rights reserved.
      6       1.1   thorpej  *
      7       1.1   thorpej  * Written by Steve C. Woodford and Jason R. Thorpe for Wasabi Systems, Inc.
      8       1.1   thorpej  *
      9       1.1   thorpej  * Redistribution and use in source and binary forms, with or without
     10       1.1   thorpej  * modification, are permitted provided that the following conditions
     11       1.1   thorpej  * are met:
     12       1.1   thorpej  * 1. Redistributions of source code must retain the above copyright
     13       1.1   thorpej  *    notice, this list of conditions and the following disclaimer.
     14       1.1   thorpej  * 2. Redistributions in binary form must reproduce the above copyright
     15       1.1   thorpej  *    notice, this list of conditions and the following disclaimer in the
     16       1.1   thorpej  *    documentation and/or other materials provided with the distribution.
     17       1.1   thorpej  * 3. All advertising materials mentioning features or use of this software
     18       1.1   thorpej  *    must display the following acknowledgement:
     19       1.1   thorpej  *      This product includes software developed for the NetBSD Project by
     20       1.1   thorpej  *      Wasabi Systems, Inc.
     21       1.1   thorpej  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
     22       1.1   thorpej  *    or promote products derived from this software without specific prior
     23       1.1   thorpej  *    written permission.
     24       1.1   thorpej  *
     25       1.1   thorpej  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
     26       1.1   thorpej  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     27       1.1   thorpej  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     28       1.1   thorpej  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
     29       1.1   thorpej  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     30       1.1   thorpej  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     31       1.1   thorpej  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     32       1.1   thorpej  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     33       1.1   thorpej  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     34       1.1   thorpej  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     35       1.1   thorpej  * POSSIBILITY OF SUCH DAMAGE.
     36       1.1   thorpej  */
     37       1.1   thorpej 
     38       1.1   thorpej /*
     39       1.1   thorpej  * Driver for the Philips PCF8583 Real Time Clock.
     40       1.1   thorpej  *
     41       1.1   thorpej  * This driver is partially derived from Ben Harris's PCF8583 driver
     42       1.1   thorpej  * for NetBSD/acorn26.
     43       1.1   thorpej  */
     44       1.1   thorpej 
     45       1.8     lukem #include <sys/cdefs.h>
     46  1.10.2.1  wrstuden __KERNEL_RCSID(0, "$NetBSD: pcf8583.c,v 1.10.2.1 2008/06/23 04:31:02 wrstuden Exp $");
     47       1.8     lukem 
     48       1.1   thorpej #include <sys/param.h>
     49       1.1   thorpej #include <sys/systm.h>
     50       1.1   thorpej #include <sys/device.h>
     51       1.1   thorpej #include <sys/kernel.h>
     52       1.1   thorpej #include <sys/fcntl.h>
     53       1.1   thorpej #include <sys/uio.h>
     54       1.1   thorpej #include <sys/conf.h>
     55       1.1   thorpej #include <sys/event.h>
     56       1.1   thorpej 
     57       1.1   thorpej #include <dev/clock_subr.h>
     58       1.1   thorpej 
     59       1.1   thorpej #include <dev/i2c/i2cvar.h>
     60       1.1   thorpej #include <dev/i2c/pcf8583reg.h>
     61       1.1   thorpej #include <dev/i2c/pcf8583var.h>
     62       1.1   thorpej 
     63       1.1   thorpej struct pcfrtc_softc {
     64      1.10   xtraeme 	device_t sc_dev;
     65       1.1   thorpej 	i2c_tag_t sc_tag;
     66       1.1   thorpej 	int sc_address;
     67       1.1   thorpej 	int sc_open;
     68       1.1   thorpej 	struct todr_chip_handle sc_todr;
     69       1.1   thorpej };
     70       1.1   thorpej 
     71      1.10   xtraeme static int  pcfrtc_match(device_t, cfdata_t, void *);
     72      1.10   xtraeme static void pcfrtc_attach(device_t, device_t, void *);
     73       1.1   thorpej 
     74      1.10   xtraeme CFATTACH_DECL_NEW(pcfrtc, sizeof(struct pcfrtc_softc),
     75       1.1   thorpej 	pcfrtc_match, pcfrtc_attach, NULL, NULL);
     76       1.1   thorpej extern struct cfdriver pcfrtc_cd;
     77       1.1   thorpej 
     78       1.1   thorpej dev_type_open(pcfrtc_open);
     79       1.1   thorpej dev_type_close(pcfrtc_close);
     80       1.1   thorpej dev_type_read(pcfrtc_read);
     81       1.1   thorpej dev_type_write(pcfrtc_write);
     82       1.1   thorpej 
     83       1.1   thorpej const struct cdevsw pcfrtc_cdevsw = {
     84       1.1   thorpej 	pcfrtc_open, pcfrtc_close, pcfrtc_read, pcfrtc_write, noioctl,
     85       1.7      cube 	nostop, notty, nopoll, nommap, nokqfilter, D_OTHER
     86       1.1   thorpej };
     87       1.1   thorpej 
     88       1.1   thorpej static int pcfrtc_clock_read(struct pcfrtc_softc *, struct clock_ymdhms *,
     89       1.1   thorpej 			     uint8_t *);
     90       1.1   thorpej static int pcfrtc_clock_write(struct pcfrtc_softc *, struct clock_ymdhms *,
     91       1.1   thorpej 			      uint8_t);
     92       1.2        he static int pcfrtc_gettime(struct todr_chip_handle *, volatile struct timeval *);
     93       1.2        he static int pcfrtc_settime(struct todr_chip_handle *, volatile struct timeval *);
     94       1.1   thorpej 
     95       1.1   thorpej int
     96      1.10   xtraeme pcfrtc_match(device_t parent, cfdata_t cf, void *aux)
     97       1.1   thorpej {
     98       1.1   thorpej 	struct i2c_attach_args *ia = aux;
     99       1.1   thorpej 
    100       1.1   thorpej 	if ((ia->ia_addr & PCF8583_ADDRMASK) == PCF8583_ADDR)
    101       1.1   thorpej 		return (1);
    102       1.1   thorpej 
    103       1.1   thorpej 	return (0);
    104       1.1   thorpej }
    105       1.1   thorpej 
    106       1.1   thorpej void
    107      1.10   xtraeme pcfrtc_attach(device_t parent, device_t self, void *aux)
    108       1.1   thorpej {
    109       1.4   thorpej 	struct pcfrtc_softc *sc = device_private(self);
    110       1.1   thorpej 	struct i2c_attach_args *ia = aux;
    111       1.1   thorpej 	uint8_t cmdbuf[1], csr;
    112       1.1   thorpej 
    113       1.1   thorpej 	sc->sc_tag = ia->ia_tag;
    114       1.1   thorpej 	sc->sc_address = ia->ia_addr;
    115      1.10   xtraeme 	sc->sc_dev = self;
    116       1.1   thorpej 
    117       1.1   thorpej 	aprint_naive(": Real-time Clock/NVRAM\n");
    118       1.1   thorpej 	aprint_normal(": PCF8583 Real-time Clock/NVRAM\n");
    119       1.1   thorpej 
    120       1.1   thorpej 	cmdbuf[0] = PCF8583_REG_CSR;
    121       1.1   thorpej 	if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_address,
    122       1.1   thorpej 	    cmdbuf, 1, &csr, 1, 0) != 0) {
    123      1.10   xtraeme 		aprint_error_dev(self, "unable to read CSR\n");
    124       1.1   thorpej 		return;
    125       1.1   thorpej 	}
    126      1.10   xtraeme 	aprint_normal_dev(sc->sc_dev, "");
    127       1.1   thorpej 	switch (csr & PCF8583_CSR_FN_MASK) {
    128       1.1   thorpej 	case PCF8583_CSR_FN_32768HZ:
    129       1.1   thorpej 		aprint_normal(" 32.768 kHz clock");
    130       1.1   thorpej 		break;
    131       1.1   thorpej 
    132       1.1   thorpej 	case PCF8583_CSR_FN_50HZ:
    133       1.1   thorpej 		aprint_normal(" 50 Hz clock");
    134       1.1   thorpej 		break;
    135       1.1   thorpej 
    136       1.1   thorpej 	case PCF8583_CSR_FN_EVENT:
    137       1.1   thorpej 		aprint_normal(" event counter");
    138       1.1   thorpej 		break;
    139       1.1   thorpej 
    140       1.1   thorpej 	case PCF8583_CSR_FN_TEST:
    141       1.1   thorpej 		aprint_normal(" test mode");
    142       1.1   thorpej 		break;
    143       1.1   thorpej 	}
    144       1.1   thorpej 	if (csr & PCF8583_CSR_STOP)
    145       1.1   thorpej 		aprint_normal(", stopped");
    146       1.1   thorpej 	if (csr & PCF8583_CSR_ALARMENABLE)
    147       1.1   thorpej 		aprint_normal(", alarm enabled");
    148       1.1   thorpej 	aprint_normal("\n");
    149       1.1   thorpej 
    150       1.1   thorpej 	sc->sc_open = 0;
    151       1.1   thorpej 
    152       1.1   thorpej 	sc->sc_todr.cookie = sc;
    153       1.1   thorpej 	sc->sc_todr.todr_gettime = pcfrtc_gettime;
    154       1.1   thorpej 	sc->sc_todr.todr_settime = pcfrtc_settime;
    155       1.1   thorpej 	sc->sc_todr.todr_setwen = NULL;
    156       1.1   thorpej 
    157       1.1   thorpej 	todr_attach(&sc->sc_todr);
    158       1.1   thorpej }
    159       1.1   thorpej 
    160       1.1   thorpej /*ARGSUSED*/
    161       1.1   thorpej int
    162       1.3  christos pcfrtc_open(dev_t dev, int flag, int fmt, struct lwp *l)
    163       1.1   thorpej {
    164       1.1   thorpej 	struct pcfrtc_softc *sc;
    165       1.1   thorpej 
    166  1.10.2.1  wrstuden 	if ((sc = device_lookup_private(&pcfrtc_cd, minor(dev))) == NULL)
    167       1.1   thorpej 		return (ENXIO);
    168       1.1   thorpej 
    169       1.1   thorpej 	/* XXX: Locking */
    170       1.1   thorpej 
    171       1.1   thorpej 	if (sc->sc_open)
    172       1.1   thorpej 		return (EBUSY);
    173       1.1   thorpej 
    174       1.1   thorpej 	sc->sc_open = 1;
    175       1.1   thorpej 	return (0);
    176       1.1   thorpej }
    177       1.1   thorpej 
    178       1.1   thorpej /*ARGSUSED*/
    179       1.1   thorpej int
    180       1.3  christos pcfrtc_close(dev_t dev, int flag, int fmt, struct lwp *l)
    181       1.1   thorpej {
    182       1.1   thorpej 	struct pcfrtc_softc *sc;
    183       1.1   thorpej 
    184  1.10.2.1  wrstuden 	if ((sc = device_lookup_private(&pcfrtc_cd, minor(dev))) == NULL)
    185       1.1   thorpej 		return (ENXIO);
    186       1.1   thorpej 
    187       1.1   thorpej 	sc->sc_open = 0;
    188       1.1   thorpej 	return (0);
    189       1.1   thorpej }
    190       1.1   thorpej 
    191       1.1   thorpej /*ARGSUSED*/
    192       1.1   thorpej int
    193       1.1   thorpej pcfrtc_read(dev_t dev, struct uio *uio, int flags)
    194       1.1   thorpej {
    195       1.1   thorpej 	struct pcfrtc_softc *sc;
    196       1.1   thorpej 	u_int8_t ch, cmdbuf[1];
    197       1.1   thorpej 	int a, error;
    198       1.1   thorpej 
    199  1.10.2.1  wrstuden 	if ((sc = device_lookup_private(&pcfrtc_cd, minor(dev))) == NULL)
    200       1.1   thorpej 		return (ENXIO);
    201       1.1   thorpej 
    202       1.1   thorpej 	if (uio->uio_offset >= PCF8583_NVRAM_SIZE)
    203       1.1   thorpej 		return (EINVAL);
    204       1.1   thorpej 
    205       1.1   thorpej 	if ((error = iic_acquire_bus(sc->sc_tag, 0)) != 0)
    206       1.1   thorpej 		return (error);
    207       1.1   thorpej 
    208       1.1   thorpej 	while (uio->uio_resid && uio->uio_offset < PCF8583_NVRAM_SIZE) {
    209       1.1   thorpej 		a = (int)uio->uio_offset;
    210       1.1   thorpej 		cmdbuf[0] = a + PCF8583_NVRAM_START;
    211       1.1   thorpej 		if ((error = iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
    212       1.1   thorpej 				      sc->sc_address, cmdbuf, 1,
    213       1.1   thorpej 				      &ch, 1, 0)) != 0) {
    214       1.1   thorpej 			iic_release_bus(sc->sc_tag, 0);
    215      1.10   xtraeme 			aprint_error_dev(sc->sc_dev,
    216      1.10   xtraeme 			    "pcfrtc_read: read failed at 0x%x\n", a);
    217       1.1   thorpej 			return (error);
    218       1.1   thorpej 		}
    219       1.1   thorpej 		if ((error = uiomove(&ch, 1, uio)) != 0) {
    220       1.1   thorpej 			iic_release_bus(sc->sc_tag, 0);
    221       1.1   thorpej 			return (error);
    222       1.1   thorpej 		}
    223       1.1   thorpej 	}
    224       1.1   thorpej 
    225       1.1   thorpej 	iic_release_bus(sc->sc_tag, 0);
    226       1.1   thorpej 
    227       1.1   thorpej 	return (0);
    228       1.1   thorpej }
    229       1.1   thorpej 
    230       1.1   thorpej /*ARGSUSED*/
    231       1.1   thorpej int
    232       1.1   thorpej pcfrtc_write(dev_t dev, struct uio *uio, int flags)
    233       1.1   thorpej {
    234       1.1   thorpej 	struct pcfrtc_softc *sc;
    235       1.1   thorpej 	u_int8_t cmdbuf[2];
    236       1.1   thorpej 	int a, error;
    237       1.1   thorpej 
    238  1.10.2.1  wrstuden 	if ((sc = device_lookup_private(&pcfrtc_cd, minor(dev))) == NULL)
    239       1.1   thorpej 		return (ENXIO);
    240       1.1   thorpej 
    241       1.1   thorpej 	if (uio->uio_offset >= PCF8583_NVRAM_SIZE)
    242       1.1   thorpej 		return (EINVAL);
    243       1.1   thorpej 
    244       1.1   thorpej 	if ((error = iic_acquire_bus(sc->sc_tag, 0)) != 0)
    245       1.1   thorpej 		return (error);
    246       1.1   thorpej 
    247       1.1   thorpej 	while (uio->uio_resid && uio->uio_offset < PCF8583_NVRAM_SIZE) {
    248       1.1   thorpej 		a = (int)uio->uio_offset;
    249       1.1   thorpej 		cmdbuf[0] = a + PCF8583_NVRAM_START;
    250       1.1   thorpej 		if ((error = uiomove(&cmdbuf[1], 1, uio)) != 0)
    251       1.1   thorpej 			break;
    252       1.1   thorpej 
    253       1.1   thorpej 		if ((error = iic_exec(sc->sc_tag,
    254       1.1   thorpej 		    uio->uio_resid ? I2C_OP_WRITE : I2C_OP_WRITE_WITH_STOP,
    255       1.1   thorpej 		    sc->sc_address, cmdbuf, 1, &cmdbuf[1], 1, 0)) != 0) {
    256      1.10   xtraeme 			aprint_error_dev(sc->sc_dev,
    257      1.10   xtraeme 			    "pcfrtc_write: write failed at 0x%x\n", a);
    258       1.1   thorpej 			return (error);
    259       1.1   thorpej 		}
    260       1.1   thorpej 	}
    261       1.1   thorpej 
    262       1.1   thorpej 	iic_release_bus(sc->sc_tag, 0);
    263       1.1   thorpej 
    264       1.1   thorpej 	return (error);
    265       1.1   thorpej }
    266       1.1   thorpej 
    267       1.1   thorpej static int
    268       1.2        he pcfrtc_gettime(struct todr_chip_handle *ch, volatile struct timeval *tv)
    269       1.1   thorpej {
    270       1.1   thorpej 	struct pcfrtc_softc *sc = ch->cookie;
    271       1.1   thorpej 	struct clock_ymdhms dt;
    272       1.5     bjh21 	int err;
    273       1.1   thorpej 	uint8_t centi;
    274       1.1   thorpej 
    275       1.5     bjh21 	if ((err = pcfrtc_clock_read(sc, &dt, &centi)))
    276       1.5     bjh21 		return err;
    277       1.1   thorpej 
    278       1.1   thorpej 	tv->tv_sec = clock_ymdhms_to_secs(&dt);
    279       1.1   thorpej 	tv->tv_usec = centi * 10000;
    280       1.1   thorpej 
    281       1.1   thorpej 	return (0);
    282       1.1   thorpej }
    283       1.1   thorpej 
    284       1.1   thorpej static int
    285       1.2        he pcfrtc_settime(struct todr_chip_handle *ch, volatile struct timeval *tv)
    286       1.1   thorpej {
    287       1.1   thorpej 	struct pcfrtc_softc *sc = ch->cookie;
    288       1.1   thorpej 	struct clock_ymdhms dt;
    289       1.5     bjh21 	int err;
    290       1.1   thorpej 
    291       1.1   thorpej 	clock_secs_to_ymdhms(tv->tv_sec, &dt);
    292       1.1   thorpej 
    293       1.5     bjh21 	if ((err = pcfrtc_clock_write(sc, &dt, tv->tv_usec / 10000) == 0))
    294       1.5     bjh21 		return err;
    295       1.1   thorpej 
    296       1.1   thorpej 	return (0);
    297       1.1   thorpej }
    298       1.1   thorpej 
    299       1.1   thorpej static const int pcf8583_rtc_offset[] = {
    300       1.1   thorpej 	PCF8583_REG_CSR,
    301       1.1   thorpej 	PCF8583_REG_CENTI,
    302       1.1   thorpej 	PCF8583_REG_SEC,
    303       1.1   thorpej 	PCF8583_REG_MIN,
    304       1.1   thorpej 	PCF8583_REG_HOUR,
    305       1.1   thorpej 	PCF8583_REG_YEARDATE,
    306       1.1   thorpej 	PCF8583_REG_WKDYMON,
    307       1.1   thorpej 	PCF8583_REG_TIMER,
    308       1.1   thorpej 	0xc0,			/* NVRAM -- year stored here */
    309       1.1   thorpej 	0xc1,			/* NVRAM -- century stored here */
    310       1.1   thorpej };
    311       1.1   thorpej 
    312       1.1   thorpej static int
    313       1.1   thorpej pcfrtc_clock_read(struct pcfrtc_softc *sc, struct clock_ymdhms *dt,
    314       1.1   thorpej     uint8_t *centi)
    315       1.1   thorpej {
    316       1.1   thorpej 	u_int8_t bcd[10], cmdbuf[1];
    317       1.5     bjh21 	int i, err;
    318       1.1   thorpej 
    319       1.5     bjh21 	if ((err = iic_acquire_bus(sc->sc_tag, I2C_F_POLL))) {
    320      1.10   xtraeme 		aprint_error_dev(sc->sc_dev,
    321      1.10   xtraeme 		    "pcfrtc_clock_read: failed to acquire I2C bus\n");
    322       1.5     bjh21 		return err;
    323       1.1   thorpej 	}
    324       1.1   thorpej 
    325       1.1   thorpej 	/* Read each timekeeping register in order. */
    326       1.1   thorpej 	for (i = 0; i < 10; i++) {
    327       1.1   thorpej 		cmdbuf[0] = pcf8583_rtc_offset[i];
    328       1.1   thorpej 
    329       1.5     bjh21 		if ((err = iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
    330       1.1   thorpej 			     sc->sc_address, cmdbuf, 1,
    331       1.5     bjh21 			     &bcd[i], 1, I2C_F_POLL))) {
    332       1.1   thorpej 			iic_release_bus(sc->sc_tag, I2C_F_POLL);
    333      1.10   xtraeme 			aprint_error_dev(sc->sc_dev,
    334      1.10   xtraeme 			    "pcfrtc_clock_read: failed to read rtc "
    335       1.9    cegger 			    "at 0x%x\n",
    336       1.1   thorpej 			    pcf8583_rtc_offset[i]);
    337       1.5     bjh21 			return err;
    338       1.1   thorpej 		}
    339       1.1   thorpej 	}
    340       1.1   thorpej 
    341       1.1   thorpej 	/* Done with I2C */
    342       1.1   thorpej 	iic_release_bus(sc->sc_tag, I2C_F_POLL);
    343       1.1   thorpej 
    344       1.1   thorpej 	/*
    345       1.1   thorpej 	 * Convert the PCF8583's register values into something useable
    346       1.1   thorpej 	 */
    347       1.1   thorpej 	*centi      = FROMBCD(bcd[PCF8583_REG_CENTI]);
    348       1.1   thorpej 	dt->dt_sec  = FROMBCD(bcd[PCF8583_REG_SEC]);
    349       1.1   thorpej 	dt->dt_min  = FROMBCD(bcd[PCF8583_REG_MIN]);
    350       1.1   thorpej 	dt->dt_hour = FROMBCD(bcd[PCF8583_REG_HOUR] & PCF8583_HOUR_MASK);
    351       1.1   thorpej 	if (bcd[PCF8583_REG_HOUR] & PCF8583_HOUR_12H) {
    352       1.1   thorpej 		dt->dt_hour %= 12;	/* 12AM -> 0, 12PM -> 12 */
    353       1.1   thorpej 		if (bcd[PCF8583_REG_HOUR] & PCF8583_HOUR_PM)
    354       1.1   thorpej 			dt->dt_hour += 12;
    355       1.1   thorpej 	}
    356       1.1   thorpej 
    357       1.1   thorpej 	dt->dt_day = FROMBCD(bcd[PCF8583_REG_YEARDATE] & PCF8583_DATE_MASK);
    358       1.1   thorpej 	dt->dt_mon = FROMBCD(bcd[PCF8583_REG_WKDYMON] & PCF8583_MON_MASK);
    359       1.1   thorpej 
    360       1.1   thorpej 	dt->dt_year = bcd[8] + (bcd[9] * 100);
    361       1.1   thorpej 	/* Try to notice if the year's rolled over. */
    362       1.1   thorpej 	if (bcd[PCF8583_REG_CSR] & PCF8583_CSR_MASK)
    363      1.10   xtraeme 		aprint_error_dev(sc->sc_dev,
    364      1.10   xtraeme 		    "cannot check year in mask mode\n");
    365       1.1   thorpej 	else {
    366       1.1   thorpej 		while (dt->dt_year % 4 !=
    367       1.1   thorpej 		       (bcd[PCF8583_REG_YEARDATE] &
    368       1.1   thorpej 			PCF8583_YEAR_MASK) >> PCF8583_YEAR_SHIFT)
    369       1.1   thorpej 			dt->dt_year++;
    370       1.1   thorpej 	}
    371       1.1   thorpej 
    372       1.5     bjh21 	return 0;
    373       1.1   thorpej }
    374       1.1   thorpej 
    375       1.1   thorpej static int
    376       1.1   thorpej pcfrtc_clock_write(struct pcfrtc_softc *sc, struct clock_ymdhms *dt,
    377       1.1   thorpej     uint8_t centi)
    378       1.1   thorpej {
    379       1.1   thorpej 	uint8_t bcd[10], cmdbuf[2];
    380       1.5     bjh21 	int i, err;
    381       1.1   thorpej 
    382       1.1   thorpej 	/*
    383       1.1   thorpej 	 * Convert our time representation into something the PCF8583
    384       1.1   thorpej 	 * can understand.
    385       1.1   thorpej 	 */
    386       1.1   thorpej 	bcd[PCF8583_REG_CENTI]    = centi;
    387       1.1   thorpej 	bcd[PCF8583_REG_SEC]      = TOBCD(dt->dt_sec);
    388       1.1   thorpej 	bcd[PCF8583_REG_MIN]      = TOBCD(dt->dt_min);
    389       1.1   thorpej 	bcd[PCF8583_REG_HOUR]     = TOBCD(dt->dt_hour) & PCF8583_HOUR_MASK;
    390       1.1   thorpej 	bcd[PCF8583_REG_YEARDATE] = TOBCD(dt->dt_day) |
    391       1.1   thorpej 	    ((dt->dt_year % 4) << PCF8583_YEAR_SHIFT);
    392       1.1   thorpej 	bcd[PCF8583_REG_WKDYMON]  = TOBCD(dt->dt_mon) |
    393       1.1   thorpej 	    ((dt->dt_wday % 4) << PCF8583_WKDY_SHIFT);
    394       1.1   thorpej 	bcd[8]                    = dt->dt_year % 100;
    395       1.1   thorpej 	bcd[9]                    = dt->dt_year / 100;
    396       1.1   thorpej 
    397       1.5     bjh21 	if ((err = iic_acquire_bus(sc->sc_tag, I2C_F_POLL))) {
    398      1.10   xtraeme 		aprint_error_dev(sc->sc_dev,
    399      1.10   xtraeme 		    "pcfrtc_clock_write: failed to acquire I2C bus\n");
    400       1.5     bjh21 		return err;
    401       1.1   thorpej 	}
    402       1.1   thorpej 
    403       1.1   thorpej 	for (i = 1; i < 10; i++) {
    404       1.1   thorpej 		cmdbuf[0] = pcf8583_rtc_offset[i];
    405       1.5     bjh21 		if ((err = iic_exec(sc->sc_tag,
    406       1.1   thorpej 			     i != 9 ? I2C_OP_WRITE : I2C_OP_WRITE_WITH_STOP,
    407       1.1   thorpej 			     sc->sc_address, cmdbuf, 1,
    408       1.5     bjh21 			     &bcd[i], 1, I2C_F_POLL))) {
    409       1.1   thorpej 			iic_release_bus(sc->sc_tag, I2C_F_POLL);
    410      1.10   xtraeme 			aprint_error_dev(sc->sc_dev,
    411      1.10   xtraeme 			    "pcfrtc_clock_write: failed to write rtc "
    412       1.9    cegger 			    " at 0x%x\n",
    413       1.1   thorpej 			    pcf8583_rtc_offset[i]);
    414       1.5     bjh21 			return err;
    415       1.1   thorpej 		}
    416       1.1   thorpej 	}
    417       1.1   thorpej 
    418       1.1   thorpej 	iic_release_bus(sc->sc_tag, I2C_F_POLL);
    419       1.1   thorpej 
    420       1.5     bjh21 	return 0;
    421       1.1   thorpej }
    422       1.1   thorpej 
    423       1.1   thorpej int
    424       1.1   thorpej pcfrtc_bootstrap_read(i2c_tag_t tag, int i2caddr, int offset,
    425       1.1   thorpej     u_int8_t *rvp, size_t len)
    426       1.1   thorpej {
    427       1.1   thorpej 	u_int8_t cmdbuf[1];
    428       1.1   thorpej 
    429       1.1   thorpej 	/*
    430       1.1   thorpej 	 * NOTE: "offset" is an absolute offset into the PCF8583
    431       1.1   thorpej 	 * address space, not relative to the NVRAM.
    432       1.1   thorpej 	 */
    433       1.1   thorpej 
    434       1.1   thorpej 	if (len == 0)
    435       1.1   thorpej 		return (0);
    436       1.1   thorpej 
    437       1.1   thorpej 	if (iic_acquire_bus(tag, I2C_F_POLL) != 0)
    438       1.1   thorpej 		return (-1);
    439       1.1   thorpej 
    440       1.1   thorpej 	while (len) {
    441       1.1   thorpej 		/* Read a single byte. */
    442       1.1   thorpej 		cmdbuf[0] = offset;
    443       1.1   thorpej 		if (iic_exec(tag, I2C_OP_READ_WITH_STOP, i2caddr,
    444       1.1   thorpej 			     cmdbuf, 1, rvp, 1, I2C_F_POLL)) {
    445       1.1   thorpej 			iic_release_bus(tag, I2C_F_POLL);
    446       1.1   thorpej 			return (-1);
    447       1.1   thorpej 		}
    448       1.1   thorpej 
    449       1.1   thorpej 		len--;
    450       1.1   thorpej 		rvp++;
    451       1.1   thorpej 		offset++;
    452       1.1   thorpej 	}
    453       1.1   thorpej 
    454       1.1   thorpej 	iic_release_bus(tag, I2C_F_POLL);
    455       1.1   thorpej 	return (0);
    456       1.1   thorpej }
    457       1.1   thorpej 
    458       1.1   thorpej int
    459       1.1   thorpej pcfrtc_bootstrap_write(i2c_tag_t tag, int i2caddr, int offset,
    460       1.1   thorpej     u_int8_t *rvp, size_t len)
    461       1.1   thorpej {
    462       1.1   thorpej 	u_int8_t cmdbuf[1];
    463       1.1   thorpej 
    464       1.1   thorpej 	/*
    465       1.1   thorpej 	 * NOTE: "offset" is an absolute offset into the PCF8583
    466       1.1   thorpej 	 * address space, not relative to the NVRAM.
    467       1.1   thorpej 	 */
    468       1.1   thorpej 
    469       1.1   thorpej 	if (len == 0)
    470       1.1   thorpej 		return (0);
    471       1.1   thorpej 
    472       1.1   thorpej 	if (iic_acquire_bus(tag, I2C_F_POLL) != 0)
    473       1.1   thorpej 		return (-1);
    474       1.1   thorpej 
    475       1.1   thorpej 	while (len) {
    476       1.1   thorpej 		/* Write a single byte. */
    477       1.1   thorpej 		cmdbuf[0] = offset;
    478       1.1   thorpej 		if (iic_exec(tag, I2C_OP_WRITE_WITH_STOP, i2caddr,
    479       1.1   thorpej 			     cmdbuf, 1, rvp, 1, I2C_F_POLL)) {
    480       1.1   thorpej 			iic_release_bus(tag, I2C_F_POLL);
    481       1.1   thorpej 			return (-1);
    482       1.1   thorpej 		}
    483       1.1   thorpej 
    484       1.1   thorpej 		len--;
    485       1.1   thorpej 		rvp++;
    486       1.1   thorpej 		offset++;
    487       1.1   thorpej 	}
    488       1.1   thorpej 
    489       1.1   thorpej 	iic_release_bus(tag, I2C_F_POLL);
    490       1.1   thorpej 	return (0);
    491       1.1   thorpej }
    492