1 /* $NetBSD: rs5c372.c,v 1.6 2006/09/04 23:45:30 gdamore 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 62 static int 63 rs5c372rtc_match(struct device *parent, struct cfdata *cf, void *arg) 64 { 65 struct i2c_attach_args *ia = arg; 66 67 if (ia->ia_addr == RS5C372_ADDR) 68 return (1); 69 return (0); 70 } 71 72 static void 73 rs5c372rtc_attach(struct device *parent, struct device *self, void *arg) 74 { 75 struct rs5c372rtc_softc *sc = device_private(self); 76 struct i2c_attach_args *ia = arg; 77 78 aprint_naive(": Real-time Clock\n"); 79 aprint_normal(": RICOH RS5C372[AB] Real-time Clock\n"); 80 81 sc->sc_tag = ia->ia_tag; 82 sc->sc_address = ia->ia_addr; 83 sc->sc_todr.cookie = sc; 84 sc->sc_todr.todr_gettime = rs5c372rtc_gettime; 85 sc->sc_todr.todr_settime = rs5c372rtc_settime; 86 sc->sc_todr.todr_setwen = NULL; 87 88 todr_attach(&sc->sc_todr); 89 90 /* Initialize RTC */ 91 rs5c372rtc_reg_write(sc, RS5C372_CONTROL2, RS5C372_CONTROL2_24HRS); 92 rs5c372rtc_reg_write(sc, RS5C372_CONTROL1, 0); 93 } 94 95 static int 96 rs5c372rtc_gettime(struct todr_chip_handle *ch, volatile struct timeval *tv) 97 { 98 struct rs5c372rtc_softc *sc = ch->cookie; 99 struct clock_ymdhms dt; 100 101 memset(&dt, 0, sizeof(dt)); 102 103 if (rs5c372rtc_clock_read(sc, &dt) == 0) 104 return (-1); 105 106 tv->tv_sec = clock_ymdhms_to_secs(&dt); 107 tv->tv_usec = 0; 108 109 return (0); 110 } 111 112 static int 113 rs5c372rtc_settime(struct todr_chip_handle *ch, volatile struct timeval *tv) 114 { 115 struct rs5c372rtc_softc *sc = ch->cookie; 116 struct clock_ymdhms dt; 117 118 clock_secs_to_ymdhms(tv->tv_sec, &dt); 119 120 if (rs5c372rtc_clock_write(sc, &dt) == 0) 121 return (-1); 122 123 return (0); 124 } 125 126 static void 127 rs5c372rtc_reg_write(struct rs5c372rtc_softc *sc, int reg, uint8_t val) 128 { 129 uint8_t cmdbuf[2]; 130 131 if (iic_acquire_bus(sc->sc_tag, I2C_F_POLL)) { 132 printf("%s: rs5c372rtc_reg_write: failed to acquire I2C bus\n", 133 sc->sc_dev.dv_xname); 134 return; 135 } 136 137 reg &= 0xf; 138 cmdbuf[0] = (reg << 4); 139 cmdbuf[1] = val; 140 if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, sc->sc_address, 141 cmdbuf, 1, &cmdbuf[1], 1, I2C_F_POLL)) { 142 iic_release_bus(sc->sc_tag, I2C_F_POLL); 143 printf("%s: rs5c372rtc_reg_write: failed to write reg%d\n", 144 sc->sc_dev.dv_xname, reg); 145 return; 146 } 147 148 iic_release_bus(sc->sc_tag, I2C_F_POLL); 149 } 150 151 static int 152 rs5c372rtc_clock_read(struct rs5c372rtc_softc *sc, struct clock_ymdhms *dt) 153 { 154 uint8_t bcd[RS5C372_NRTC_REGS]; 155 uint8_t cmdbuf[1]; 156 157 if (iic_acquire_bus(sc->sc_tag, I2C_F_POLL)) { 158 printf("%s: rs5c372rtc_clock_read: failed to acquire I2C bus\n", 159 sc->sc_dev.dv_xname); 160 return (0); 161 } 162 163 cmdbuf[0] = (RS5C372_SECONDS << 4); 164 if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_address, 165 cmdbuf, 1, bcd, RS5C372_NRTC_REGS, I2C_F_POLL)) { 166 iic_release_bus(sc->sc_tag, I2C_F_POLL); 167 printf("%s: rs5c372rtc_clock_read: failed to read rtc\n", 168 sc->sc_dev.dv_xname); 169 return (0); 170 } 171 172 iic_release_bus(sc->sc_tag, I2C_F_POLL); 173 174 /* 175 * Convert the RS5C372's register values into something useable 176 */ 177 dt->dt_sec = FROMBCD(bcd[RS5C372_SECONDS] & RS5C372_SECONDS_MASK); 178 dt->dt_min = FROMBCD(bcd[RS5C372_MINUTES] & RS5C372_MINUTES_MASK); 179 dt->dt_hour = FROMBCD(bcd[RS5C372_HOURS] & RS5C372_HOURS_24MASK); 180 dt->dt_day = FROMBCD(bcd[RS5C372_DATE] & RS5C372_DATE_MASK); 181 dt->dt_mon = FROMBCD(bcd[RS5C372_MONTH] & RS5C372_MONTH_MASK); 182 dt->dt_year = FROMBCD(bcd[RS5C372_YEAR]) + 2000; 183 184 return (1); 185 } 186 187 static int 188 rs5c372rtc_clock_write(struct rs5c372rtc_softc *sc, struct clock_ymdhms *dt) 189 { 190 uint8_t bcd[RS5C372_NRTC_REGS]; 191 uint8_t cmdbuf[1]; 192 193 /* 194 * Convert our time representation into something the RS5C372 195 * can understand. 196 */ 197 bcd[RS5C372_SECONDS] = TOBCD(dt->dt_sec); 198 bcd[RS5C372_MINUTES] = TOBCD(dt->dt_min); 199 bcd[RS5C372_HOURS] = TOBCD(dt->dt_hour); 200 bcd[RS5C372_DATE] = TOBCD(dt->dt_day); 201 bcd[RS5C372_DAY] = TOBCD(dt->dt_wday); 202 bcd[RS5C372_MONTH] = TOBCD(dt->dt_mon); 203 bcd[RS5C372_YEAR] = TOBCD(dt->dt_year % 100); 204 205 if (iic_acquire_bus(sc->sc_tag, I2C_F_POLL)) { 206 printf("%s: rs5c372rtc_clock_write: failed to " 207 "acquire I2C bus\n", sc->sc_dev.dv_xname); 208 return (0); 209 } 210 211 cmdbuf[0] = (RS5C372_SECONDS << 4); 212 if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, sc->sc_address, 213 cmdbuf, 1, bcd, RS5C372_NRTC_REGS, I2C_F_POLL)) { 214 iic_release_bus(sc->sc_tag, I2C_F_POLL); 215 printf("%s: rs5c372rtc_clock_write: failed to write rtc\n", 216 sc->sc_dev.dv_xname); 217 return (0); 218 } 219 220 iic_release_bus(sc->sc_tag, I2C_F_POLL); 221 222 return (1); 223 } 224