rs5c372.c revision 1.5
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 #include <dev/i2c/rs5c372reg.h> 42 43 struct rs5c372rtc_softc { 44 struct device sc_dev; 45 i2c_tag_t sc_tag; 46 int sc_address; 47 struct todr_chip_handle sc_todr; 48 }; 49 50 static int rs5c372rtc_match(struct device *, struct cfdata *, void *); 51 static void rs5c372rtc_attach(struct device *, struct device *, void *); 52 53 CFATTACH_DECL(rs5c372rtc, sizeof(struct rs5c372rtc_softc), 54 rs5c372rtc_match, rs5c372rtc_attach, NULL, NULL); 55 56 static void rs5c372rtc_reg_write(struct rs5c372rtc_softc *, int, uint8_t); 57 static int rs5c372rtc_clock_read(struct rs5c372rtc_softc *, struct clock_ymdhms *); 58 static int rs5c372rtc_clock_write(struct rs5c372rtc_softc *, struct clock_ymdhms *); 59 static int rs5c372rtc_gettime(struct todr_chip_handle *, volatile struct timeval *); 60 static int rs5c372rtc_settime(struct todr_chip_handle *, volatile struct timeval *); 61 static int rs5c372rtc_getcal(struct todr_chip_handle *, int *); 62 static int rs5c372rtc_setcal(struct todr_chip_handle *, int); 63 64 static int 65 rs5c372rtc_match(struct device *parent, struct cfdata *cf, void *arg) 66 { 67 struct i2c_attach_args *ia = arg; 68 69 if (ia->ia_addr == RS5C372_ADDR) 70 return (1); 71 return (0); 72 } 73 74 static void 75 rs5c372rtc_attach(struct device *parent, struct device *self, void *arg) 76 { 77 struct rs5c372rtc_softc *sc = device_private(self); 78 struct i2c_attach_args *ia = arg; 79 80 aprint_naive(": Real-time Clock\n"); 81 aprint_normal(": RICOH RS5C372[AB] Real-time Clock\n"); 82 83 sc->sc_tag = ia->ia_tag; 84 sc->sc_address = ia->ia_addr; 85 sc->sc_todr.cookie = sc; 86 sc->sc_todr.todr_gettime = rs5c372rtc_gettime; 87 sc->sc_todr.todr_settime = rs5c372rtc_settime; 88 sc->sc_todr.todr_getcal = rs5c372rtc_getcal; 89 sc->sc_todr.todr_setcal = rs5c372rtc_setcal; 90 sc->sc_todr.todr_setwen = NULL; 91 92 todr_attach(&sc->sc_todr); 93 94 /* Initialize RTC */ 95 rs5c372rtc_reg_write(sc, RS5C372_CONTROL2, RS5C372_CONTROL2_24HRS); 96 rs5c372rtc_reg_write(sc, RS5C372_CONTROL1, 0); 97 } 98 99 static int 100 rs5c372rtc_gettime(struct todr_chip_handle *ch, volatile struct timeval *tv) 101 { 102 struct rs5c372rtc_softc *sc = ch->cookie; 103 struct clock_ymdhms dt; 104 105 memset(&dt, 0, sizeof(dt)); 106 107 if (rs5c372rtc_clock_read(sc, &dt) == 0) 108 return (-1); 109 110 tv->tv_sec = clock_ymdhms_to_secs(&dt); 111 tv->tv_usec = 0; 112 113 return (0); 114 } 115 116 static int 117 rs5c372rtc_settime(struct todr_chip_handle *ch, volatile struct timeval *tv) 118 { 119 struct rs5c372rtc_softc *sc = ch->cookie; 120 struct clock_ymdhms dt; 121 122 clock_secs_to_ymdhms(tv->tv_sec, &dt); 123 124 if (rs5c372rtc_clock_write(sc, &dt) == 0) 125 return (-1); 126 127 return (0); 128 } 129 130 static int 131 rs5c372rtc_setcal(struct todr_chip_handle *ch, int cal) 132 { 133 134 return (EOPNOTSUPP); 135 } 136 137 static int 138 rs5c372rtc_getcal(struct todr_chip_handle *ch, int *cal) 139 { 140 141 return (EOPNOTSUPP); 142 } 143 144 static void 145 rs5c372rtc_reg_write(struct rs5c372rtc_softc *sc, int reg, uint8_t val) 146 { 147 uint8_t cmdbuf[2]; 148 149 if (iic_acquire_bus(sc->sc_tag, I2C_F_POLL)) { 150 printf("%s: rs5c372rtc_reg_write: failed to acquire I2C bus\n", 151 sc->sc_dev.dv_xname); 152 return; 153 } 154 155 reg &= 0xf; 156 cmdbuf[0] = (reg << 4); 157 cmdbuf[1] = val; 158 if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, sc->sc_address, 159 cmdbuf, 1, &cmdbuf[1], 1, I2C_F_POLL)) { 160 iic_release_bus(sc->sc_tag, I2C_F_POLL); 161 printf("%s: rs5c372rtc_reg_write: failed to write reg%d\n", 162 sc->sc_dev.dv_xname, reg); 163 return; 164 } 165 166 iic_release_bus(sc->sc_tag, I2C_F_POLL); 167 } 168 169 static int 170 rs5c372rtc_clock_read(struct rs5c372rtc_softc *sc, struct clock_ymdhms *dt) 171 { 172 uint8_t bcd[RS5C372_NRTC_REGS]; 173 uint8_t cmdbuf[1]; 174 175 if (iic_acquire_bus(sc->sc_tag, I2C_F_POLL)) { 176 printf("%s: rs5c372rtc_clock_read: failed to acquire I2C bus\n", 177 sc->sc_dev.dv_xname); 178 return (0); 179 } 180 181 cmdbuf[0] = (RS5C372_SECONDS << 4); 182 if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_address, 183 cmdbuf, 1, bcd, RS5C372_NRTC_REGS, I2C_F_POLL)) { 184 iic_release_bus(sc->sc_tag, I2C_F_POLL); 185 printf("%s: rs5c372rtc_clock_read: failed to read rtc\n", 186 sc->sc_dev.dv_xname); 187 return (0); 188 } 189 190 iic_release_bus(sc->sc_tag, I2C_F_POLL); 191 192 /* 193 * Convert the RS5C372's register values into something useable 194 */ 195 dt->dt_sec = FROMBCD(bcd[RS5C372_SECONDS] & RS5C372_SECONDS_MASK); 196 dt->dt_min = FROMBCD(bcd[RS5C372_MINUTES] & RS5C372_MINUTES_MASK); 197 dt->dt_hour = FROMBCD(bcd[RS5C372_HOURS] & RS5C372_HOURS_24MASK); 198 dt->dt_day = FROMBCD(bcd[RS5C372_DATE] & RS5C372_DATE_MASK); 199 dt->dt_mon = FROMBCD(bcd[RS5C372_MONTH] & RS5C372_MONTH_MASK); 200 dt->dt_year = FROMBCD(bcd[RS5C372_YEAR]) + 2000; 201 202 return (1); 203 } 204 205 static int 206 rs5c372rtc_clock_write(struct rs5c372rtc_softc *sc, struct clock_ymdhms *dt) 207 { 208 uint8_t bcd[RS5C372_NRTC_REGS]; 209 uint8_t cmdbuf[1]; 210 211 /* 212 * Convert our time representation into something the RS5C372 213 * can understand. 214 */ 215 bcd[RS5C372_SECONDS] = TOBCD(dt->dt_sec); 216 bcd[RS5C372_MINUTES] = TOBCD(dt->dt_min); 217 bcd[RS5C372_HOURS] = TOBCD(dt->dt_hour); 218 bcd[RS5C372_DATE] = TOBCD(dt->dt_day); 219 bcd[RS5C372_DAY] = TOBCD(dt->dt_wday); 220 bcd[RS5C372_MONTH] = TOBCD(dt->dt_mon); 221 bcd[RS5C372_YEAR] = TOBCD(dt->dt_year % 100); 222 223 if (iic_acquire_bus(sc->sc_tag, I2C_F_POLL)) { 224 printf("%s: rs5c372rtc_clock_write: failed to " 225 "acquire I2C bus\n", sc->sc_dev.dv_xname); 226 return (0); 227 } 228 229 cmdbuf[0] = (RS5C372_SECONDS << 4); 230 if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, sc->sc_address, 231 cmdbuf, 1, bcd, RS5C372_NRTC_REGS, I2C_F_POLL)) { 232 iic_release_bus(sc->sc_tag, I2C_F_POLL); 233 printf("%s: rs5c372rtc_clock_write: failed to write rtc\n", 234 sc->sc_dev.dv_xname); 235 return (0); 236 } 237 238 iic_release_bus(sc->sc_tag, I2C_F_POLL); 239 240 return (1); 241 } 242
Indexes created Wed Sep 24 14:09:57 GMT 2025