Annotation of sys/dev/i2c/rs5c372.c, Revision 1.1
1.1 ! nbrk 1: /* $NetBSD: rs5c372.c,v 1.5 2006/03/29 06:41:24 thorpej Exp $ */
! 2:
! 3: /*
! 4: * Copyright (c) 2005 Kimihiro Nonaka
! 5: * All rights reserved.
! 6: *
! 7: * Redistribution and use in source and binary forms, with or without
! 8: * modification, are permitted provided that the following conditions
! 9: * are met:
! 10: * 1. Redistributions of source code must retain the above copyright
! 11: * notice, this list of conditions and the following disclaimer.
! 12: * 2. Redistributions in binary form must reproduce the above copyright
! 13: * notice, this list of conditions and the following disclaimer in the
! 14: * documentation and/or other materials provided with the distribution.
! 15: *
! 16: * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
! 17: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
! 18: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
! 19: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
! 20: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
! 21: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
! 22: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
! 23: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
! 24: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
! 25: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
! 26: * POSSIBILITY OF SUCH DAMAGE.
! 27: */
! 28:
! 29: #include <sys/param.h>
! 30: #include <sys/systm.h>
! 31: #include <sys/device.h>
! 32: #include <sys/kernel.h>
! 33: #include <sys/fcntl.h>
! 34: #include <sys/uio.h>
! 35: #include <sys/conf.h>
! 36: #include <sys/event.h>
! 37:
! 38: #include <dev/clock_subr.h>
! 39:
! 40: #include <dev/i2c/i2cvar.h>
! 41:
! 42: /*
! 43: * RS5C372[AB] Real-Time Clock
! 44: */
! 45:
! 46: #define RICOHRTC_ADDR 0x32 /* Fixed I2C Slave Address */
! 47:
! 48: #define RICOHRTC_SECONDS 0
! 49: #define RICOHRTC_MINUTES 1
! 50: #define RICOHRTC_HOURS 2
! 51: #define RICOHRTC_DAY 3
! 52: #define RICOHRTC_DATE 4
! 53: #define RICOHRTC_MONTH 5
! 54: #define RICOHRTC_YEAR 6
! 55: #define RICOHRTC_CLOCK_CORRECT 7
! 56: #define RICOHRTC_ALARMA_MIN 8
! 57: #define RICOHRTC_ALARMA_HOUR 9
! 58: #define RICOHRTC_ALARMA_DATE 10
! 59: #define RICOHRTC_ALARMB_MIN 11
! 60: #define RICOHRTC_ALARMB_HOUR 12
! 61: #define RICOHRTC_ALARMB_DATE 13
! 62: #define RICOHRTC_CONTROL1 14
! 63: #define RICOHRTC_CONTROL2 15
! 64: #define RICOHRTC_NREGS 16
! 65: #define RICOHRTC_NRTC_REGS 7
! 66:
! 67: /*
! 68: * Bit definitions.
! 69: */
! 70: #define RICOHRTC_SECONDS_MASK 0x7f
! 71: #define RICOHRTC_MINUTES_MASK 0x7f
! 72: #define RICOHRTC_HOURS_12HRS_PM (1u << 5) /* If 12 hr mode, set = PM */
! 73: #define RICOHRTC_HOURS_12MASK 0x1f
! 74: #define RICOHRTC_HOURS_24MASK 0x3f
! 75: #define RICOHRTC_DAY_MASK 0x07
! 76: #define RICOHRTC_DATE_MASK 0x3f
! 77: #define RICOHRTC_MONTH_MASK 0x1f
! 78: #define RICOHRTC_CONTROL2_24HRS (1u << 5)
! 79: #define RICOHRTC_CONTROL2_XSTP (1u << 4) /* read */
! 80: #define RICOHRTC_CONTROL2_ADJ (1u << 4) /* write */
! 81: #define RICOHRTC_CONTROL2_NCLEN (1u << 3)
! 82: #define RICOHRTC_CONTROL2_CTFG (1u << 2)
! 83: #define RICOHRTC_CONTROL2_AAFG (1u << 1)
! 84: #define RICOHRTC_CONTROL2_BAFG (1u << 0)
! 85:
! 86: struct ricohrtc_softc {
! 87: struct device sc_dev;
! 88: i2c_tag_t sc_tag;
! 89: int sc_address;
! 90: struct todr_chip_handle sc_todr;
! 91: };
! 92:
! 93: int ricohrtc_match(struct device *, void *, void *);
! 94: void ricohrtc_attach(struct device *, struct device *, void *);
! 95:
! 96: struct cfattach ricohrtc_ca = {
! 97: sizeof(struct ricohrtc_softc), ricohrtc_match, ricohrtc_attach
! 98: };
! 99:
! 100: struct cfdriver ricohrtc_cd = {
! 101: NULL, "ricohrtc", DV_DULL
! 102: };
! 103:
! 104: void ricohrtc_reg_write(struct ricohrtc_softc *, int, uint8_t);
! 105: int ricohrtc_clock_read(struct ricohrtc_softc *, struct clock_ymdhms *);
! 106: int ricohrtc_clock_write(struct ricohrtc_softc *, struct clock_ymdhms *);
! 107: int ricohrtc_gettime(struct todr_chip_handle *, struct timeval *);
! 108: int ricohrtc_settime(struct todr_chip_handle *, struct timeval *);
! 109: int ricohrtc_getcal(struct todr_chip_handle *, int *);
! 110: int ricohrtc_setcal(struct todr_chip_handle *, int);
! 111:
! 112: int
! 113: ricohrtc_match(struct device *parent, void *v, void *arg)
! 114: {
! 115: struct i2c_attach_args *ia = arg;
! 116: #ifdef PARANOID_CHECKS
! 117: u_int8_t data, cmd;
! 118: #endif
! 119:
! 120: if (ia->ia_addr != RICOHRTC_ADDR)
! 121: return (0);
! 122:
! 123: #ifdef PARANOID_CHECKS
! 124: /* Verify that the 'reserved bits in a few registers read 0 */
! 125: if (iic_acquire_bus(ia->ia_tag, I2C_F_POLL)) {
! 126: printf("ricohrtc acquire fail\n");
! 127: return (0);
! 128: }
! 129:
! 130: cmd = RICOHRTC_SECONDS;
! 131: if (iic_exec(ia->ia_tag, I2C_OP_READ_WITH_STOP, ia->ia_addr,
! 132: &cmd, 1, &data, 1, I2C_F_POLL)) {
! 133: iic_release_bus(ia->ia_tag, I2C_F_POLL);
! 134: printf("ricohrtc read %d fail\n", cmd);
! 135: return (0);
! 136: }
! 137: if ((data & ~RICOHRTC_SECONDS_MASK) != 0) {
! 138: printf("ricohrtc second %d\n",data);
! 139: return (0);
! 140: }
! 141:
! 142: cmd = RICOHRTC_MINUTES;
! 143: if (iic_exec(ia->ia_tag, I2C_OP_READ_WITH_STOP, ia->ia_addr,
! 144: &cmd, 1, &data, 1, I2C_F_POLL)) {
! 145: iic_release_bus(ia->ia_tag, I2C_F_POLL);
! 146: printf("ricohrtc read %d fail\n", cmd);
! 147: return (0);
! 148: }
! 149:
! 150: if ((data & ~RICOHRTC_MINUTES_MASK) != 0) {
! 151: printf("ricohrtc minute %d\n",data);
! 152: return (0);
! 153: }
! 154:
! 155: cmd = RICOHRTC_HOURS;
! 156: if (iic_exec(ia->ia_tag, I2C_OP_READ_WITH_STOP, ia->ia_addr,
! 157: &cmd, 1, &data, 1, I2C_F_POLL)) {
! 158: iic_release_bus(ia->ia_tag, I2C_F_POLL);
! 159: printf("ricohrtc read %d fail\n", cmd);
! 160: return (0);
! 161: }
! 162: if ((data & ~RICOHRTC_HOURS_24MASK) != 0) {
! 163: printf("ricohrtc hour %d\n",data);
! 164: return (0);
! 165: }
! 166: #endif
! 167:
! 168: iic_release_bus(ia->ia_tag, I2C_F_POLL);
! 169: return (1);
! 170: }
! 171:
! 172: void
! 173: ricohrtc_attach(struct device *parent, struct device *self, void *arg)
! 174: {
! 175: struct ricohrtc_softc *sc = (struct ricohrtc_softc *)self;
! 176: struct i2c_attach_args *ia = arg;
! 177:
! 178: printf(": RICOH RS5C372[AB] Real-time Clock\n");
! 179:
! 180: sc->sc_tag = ia->ia_tag;
! 181: sc->sc_address = ia->ia_addr;
! 182: sc->sc_todr.cookie = sc;
! 183: sc->sc_todr.todr_gettime = ricohrtc_gettime;
! 184: sc->sc_todr.todr_settime = ricohrtc_settime;
! 185: sc->sc_todr.todr_getcal = ricohrtc_getcal;
! 186: sc->sc_todr.todr_setcal = ricohrtc_setcal;
! 187: sc->sc_todr.todr_setwen = NULL;
! 188:
! 189: #if 0
! 190: todr_attach(&sc->sc_todr);
! 191: #else
! 192: /* XXX */
! 193: {
! 194: extern todr_chip_handle_t todr_handle;
! 195: todr_handle = &sc->sc_todr;
! 196: }
! 197: #endif
! 198:
! 199: /* Initialize RTC */
! 200: ricohrtc_reg_write(sc, RICOHRTC_CONTROL2, RICOHRTC_CONTROL2_24HRS);
! 201: ricohrtc_reg_write(sc, RICOHRTC_CONTROL1, 0);
! 202: }
! 203:
! 204: int
! 205: ricohrtc_gettime(struct todr_chip_handle *ch, struct timeval *tv)
! 206: {
! 207: struct ricohrtc_softc *sc = ch->cookie;
! 208: struct clock_ymdhms dt;
! 209:
! 210: memset(&dt, 0, sizeof(dt));
! 211: if (ricohrtc_clock_read(sc, &dt) == 0)
! 212: return (-1);
! 213:
! 214: tv->tv_sec = clock_ymdhms_to_secs(&dt);
! 215: tv->tv_usec = 0;
! 216: return (0);
! 217: }
! 218:
! 219: int
! 220: ricohrtc_settime(struct todr_chip_handle *ch, struct timeval *tv)
! 221: {
! 222: struct ricohrtc_softc *sc = ch->cookie;
! 223: struct clock_ymdhms dt;
! 224:
! 225: clock_secs_to_ymdhms(tv->tv_sec, &dt);
! 226:
! 227: if (ricohrtc_clock_write(sc, &dt) == 0)
! 228: return (-1);
! 229: return (0);
! 230: }
! 231:
! 232: int
! 233: ricohrtc_setcal(struct todr_chip_handle *ch, int cal)
! 234: {
! 235:
! 236: return (EOPNOTSUPP);
! 237: }
! 238:
! 239: int
! 240: ricohrtc_getcal(struct todr_chip_handle *ch, int *cal)
! 241: {
! 242:
! 243: return (EOPNOTSUPP);
! 244: }
! 245:
! 246: void
! 247: ricohrtc_reg_write(struct ricohrtc_softc *sc, int reg, uint8_t val)
! 248: {
! 249: uint8_t cmd;
! 250:
! 251: iic_acquire_bus(sc->sc_tag, I2C_F_POLL);
! 252: reg &= 0xf;
! 253: cmd = (reg << 4);
! 254: if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, sc->sc_address,
! 255: &cmd, 1, &val, 1, I2C_F_POLL)) {
! 256: iic_release_bus(sc->sc_tag, I2C_F_POLL);
! 257: printf("%s: ricohrtc_reg_write: failed to write reg%d\n",
! 258: sc->sc_dev.dv_xname, reg);
! 259: return;
! 260: }
! 261: iic_release_bus(sc->sc_tag, I2C_F_POLL);
! 262: }
! 263:
! 264: int
! 265: ricohrtc_clock_read(struct ricohrtc_softc *sc, struct clock_ymdhms *dt)
! 266: {
! 267: uint8_t bcd[RICOHRTC_NRTC_REGS];
! 268: uint8_t cmd;
! 269:
! 270: iic_acquire_bus(sc->sc_tag, I2C_F_POLL);
! 271: cmd = (RICOHRTC_SECONDS << 4);
! 272: if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_address,
! 273: &cmd, 1, bcd, RICOHRTC_NRTC_REGS, I2C_F_POLL)) {
! 274: iic_release_bus(sc->sc_tag, I2C_F_POLL);
! 275: printf("%s: ricohrtc_clock_read: failed to read rtc\n",
! 276: sc->sc_dev.dv_xname);
! 277: return (0);
! 278: }
! 279: iic_release_bus(sc->sc_tag, I2C_F_POLL);
! 280:
! 281: /*
! 282: * Convert the RICOHRTC's register values into something useable
! 283: */
! 284: dt->dt_sec = FROMBCD(bcd[RICOHRTC_SECONDS] & RICOHRTC_SECONDS_MASK);
! 285: dt->dt_min = FROMBCD(bcd[RICOHRTC_MINUTES] & RICOHRTC_MINUTES_MASK);
! 286: dt->dt_hour = FROMBCD(bcd[RICOHRTC_HOURS] & RICOHRTC_HOURS_24MASK);
! 287: dt->dt_day = FROMBCD(bcd[RICOHRTC_DATE] & RICOHRTC_DATE_MASK);
! 288: dt->dt_mon = FROMBCD(bcd[RICOHRTC_MONTH] & RICOHRTC_MONTH_MASK);
! 289: dt->dt_year = FROMBCD(bcd[RICOHRTC_YEAR]) + POSIX_BASE_YEAR;
! 290: return (1);
! 291: }
! 292:
! 293: int
! 294: ricohrtc_clock_write(struct ricohrtc_softc *sc, struct clock_ymdhms *dt)
! 295: {
! 296: uint8_t bcd[RICOHRTC_NRTC_REGS];
! 297: uint8_t cmd;
! 298:
! 299: /*
! 300: * Convert our time representation into something the RICOHRTC
! 301: * can understand.
! 302: */
! 303: bcd[RICOHRTC_SECONDS] = TOBCD(dt->dt_sec);
! 304: bcd[RICOHRTC_MINUTES] = TOBCD(dt->dt_min);
! 305: bcd[RICOHRTC_HOURS] = TOBCD(dt->dt_hour);
! 306: bcd[RICOHRTC_DATE] = TOBCD(dt->dt_day);
! 307: bcd[RICOHRTC_DAY] = TOBCD(dt->dt_wday);
! 308: bcd[RICOHRTC_MONTH] = TOBCD(dt->dt_mon);
! 309: bcd[RICOHRTC_YEAR] = TOBCD(dt->dt_year - POSIX_BASE_YEAR);
! 310:
! 311: iic_acquire_bus(sc->sc_tag, I2C_F_POLL);
! 312: cmd = (RICOHRTC_SECONDS << 4);
! 313: if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, sc->sc_address,
! 314: &cmd, 1, bcd, RICOHRTC_NRTC_REGS, I2C_F_POLL)) {
! 315: iic_release_bus(sc->sc_tag, I2C_F_POLL);
! 316: printf("%s: ricohrtc_clock_write: failed to write rtc\n",
! 317: sc->sc_dev.dv_xname);
! 318: return (0);
! 319: }
! 320: iic_release_bus(sc->sc_tag, I2C_F_POLL);
! 321: return (1);
! 322: }
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