rs5c372.c revision 1.8
1 /* $NetBSD: rs5c372.c,v 1.8 2008/04/06 20:25:59 cegger 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/cdefs.h> 30 __KERNEL_RCSID(0, "$NetBSD: rs5c372.c,v 1.8 2008/04/06 20:25:59 cegger Exp $"); 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/device.h> 35 #include <sys/kernel.h> 36 #include <sys/fcntl.h> 37 #include <sys/uio.h> 38 #include <sys/conf.h> 39 #include <sys/event.h> 40 41 #include <dev/clock_subr.h> 42 43 #include <dev/i2c/i2cvar.h> 44 #include <dev/i2c/rs5c372reg.h> 45 46 struct rs5c372rtc_softc { 47 struct device sc_dev; 48 i2c_tag_t sc_tag; 49 int sc_address; 50 struct todr_chip_handle sc_todr; 51 }; 52 53 static int rs5c372rtc_match(struct device *, struct cfdata *, void *); 54 static void rs5c372rtc_attach(struct device *, struct device *, void *); 55 56 CFATTACH_DECL(rs5c372rtc, sizeof(struct rs5c372rtc_softc), 57 rs5c372rtc_match, rs5c372rtc_attach, NULL, NULL); 58 59 static void rs5c372rtc_reg_write(struct rs5c372rtc_softc *, int, uint8_t); 60 static int rs5c372rtc_clock_read(struct rs5c372rtc_softc *, struct clock_ymdhms *); 61 static int rs5c372rtc_clock_write(struct rs5c372rtc_softc *, struct clock_ymdhms *); 62 static int rs5c372rtc_gettime(struct todr_chip_handle *, volatile struct timeval *); 63 static int rs5c372rtc_settime(struct todr_chip_handle *, volatile struct timeval *); 64 65 static int 66 rs5c372rtc_match(struct device *parent, struct cfdata *cf, void *arg) 67 { 68 struct i2c_attach_args *ia = arg; 69 70 if (ia->ia_addr == RS5C372_ADDR) 71 return (1); 72 return (0); 73 } 74 75 static void 76 rs5c372rtc_attach(struct device *parent, struct device *self, void *arg) 77 { 78 struct rs5c372rtc_softc *sc = device_private(self); 79 struct i2c_attach_args *ia = arg; 80 81 aprint_naive(": Real-time Clock\n"); 82 aprint_normal(": RICOH RS5C372[AB] Real-time Clock\n"); 83 84 sc->sc_tag = ia->ia_tag; 85 sc->sc_address = ia->ia_addr; 86 sc->sc_todr.cookie = sc; 87 sc->sc_todr.todr_gettime = rs5c372rtc_gettime; 88 sc->sc_todr.todr_settime = rs5c372rtc_settime; 89 sc->sc_todr.todr_setwen = NULL; 90 91 todr_attach(&sc->sc_todr); 92 93 /* Initialize RTC */ 94 rs5c372rtc_reg_write(sc, RS5C372_CONTROL2, RS5C372_CONTROL2_24HRS); 95 rs5c372rtc_reg_write(sc, RS5C372_CONTROL1, 0); 96 } 97 98 static int 99 rs5c372rtc_gettime(struct todr_chip_handle *ch, volatile struct timeval *tv) 100 { 101 struct rs5c372rtc_softc *sc = ch->cookie; 102 struct clock_ymdhms dt; 103 104 memset(&dt, 0, sizeof(dt)); 105 106 if (rs5c372rtc_clock_read(sc, &dt) == 0) 107 return (-1); 108 109 tv->tv_sec = clock_ymdhms_to_secs(&dt); 110 tv->tv_usec = 0; 111 112 return (0); 113 } 114 115 static int 116 rs5c372rtc_settime(struct todr_chip_handle *ch, volatile struct timeval *tv) 117 { 118 struct rs5c372rtc_softc *sc = ch->cookie; 119 struct clock_ymdhms dt; 120 121 clock_secs_to_ymdhms(tv->tv_sec, &dt); 122 123 if (rs5c372rtc_clock_write(sc, &dt) == 0) 124 return (-1); 125 126 return (0); 127 } 128 129 static void 130 rs5c372rtc_reg_write(struct rs5c372rtc_softc *sc, int reg, uint8_t val) 131 { 132 uint8_t cmdbuf[2]; 133 134 if (iic_acquire_bus(sc->sc_tag, I2C_F_POLL)) { 135 aprint_error_dev(&sc->sc_dev, "rs5c372rtc_reg_write: failed to acquire I2C bus\n"); 136 return; 137 } 138 139 reg &= 0xf; 140 cmdbuf[0] = (reg << 4); 141 cmdbuf[1] = val; 142 if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, sc->sc_address, 143 cmdbuf, 1, &cmdbuf[1], 1, I2C_F_POLL)) { 144 iic_release_bus(sc->sc_tag, I2C_F_POLL); 145 aprint_error_dev(&sc->sc_dev, "rs5c372rtc_reg_write: failed to write reg%d\n", reg); 146 return; 147 } 148 149 iic_release_bus(sc->sc_tag, I2C_F_POLL); 150 } 151 152 static int 153 rs5c372rtc_clock_read(struct rs5c372rtc_softc *sc, struct clock_ymdhms *dt) 154 { 155 uint8_t bcd[RS5C372_NRTC_REGS]; 156 uint8_t cmdbuf[1]; 157 158 if (iic_acquire_bus(sc->sc_tag, I2C_F_POLL)) { 159 aprint_error_dev(&sc->sc_dev, "rs5c372rtc_clock_read: failed to acquire I2C bus\n"); 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 aprint_error_dev(&sc->sc_dev, "rs5c372rtc_clock_read: failed to read rtc\n"); 168 return (0); 169 } 170 171 iic_release_bus(sc->sc_tag, I2C_F_POLL); 172 173 /* 174 * Convert the RS5C372's register values into something useable 175 */ 176 dt->dt_sec = FROMBCD(bcd[RS5C372_SECONDS] & RS5C372_SECONDS_MASK); 177 dt->dt_min = FROMBCD(bcd[RS5C372_MINUTES] & RS5C372_MINUTES_MASK); 178 dt->dt_hour = FROMBCD(bcd[RS5C372_HOURS] & RS5C372_HOURS_24MASK); 179 dt->dt_day = FROMBCD(bcd[RS5C372_DATE] & RS5C372_DATE_MASK); 180 dt->dt_mon = FROMBCD(bcd[RS5C372_MONTH] & RS5C372_MONTH_MASK); 181 dt->dt_year = FROMBCD(bcd[RS5C372_YEAR]) + 2000; 182 183 return (1); 184 } 185 186 static int 187 rs5c372rtc_clock_write(struct rs5c372rtc_softc *sc, struct clock_ymdhms *dt) 188 { 189 uint8_t bcd[RS5C372_NRTC_REGS]; 190 uint8_t cmdbuf[1]; 191 192 /* 193 * Convert our time representation into something the RS5C372 194 * can understand. 195 */ 196 bcd[RS5C372_SECONDS] = TOBCD(dt->dt_sec); 197 bcd[RS5C372_MINUTES] = TOBCD(dt->dt_min); 198 bcd[RS5C372_HOURS] = TOBCD(dt->dt_hour); 199 bcd[RS5C372_DATE] = TOBCD(dt->dt_day); 200 bcd[RS5C372_DAY] = TOBCD(dt->dt_wday); 201 bcd[RS5C372_MONTH] = TOBCD(dt->dt_mon); 202 bcd[RS5C372_YEAR] = TOBCD(dt->dt_year % 100); 203 204 if (iic_acquire_bus(sc->sc_tag, I2C_F_POLL)) { 205 aprint_error_dev(&sc->sc_dev, "rs5c372rtc_clock_write: failed to " 206 "acquire I2C bus\n"); 207 return (0); 208 } 209 210 cmdbuf[0] = (RS5C372_SECONDS << 4); 211 if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, sc->sc_address, 212 cmdbuf, 1, bcd, RS5C372_NRTC_REGS, I2C_F_POLL)) { 213 iic_release_bus(sc->sc_tag, I2C_F_POLL); 214 aprint_error_dev(&sc->sc_dev, "rs5c372rtc_clock_write: failed to write rtc\n"); 215 return (0); 216 } 217 218 iic_release_bus(sc->sc_tag, I2C_F_POLL); 219 220 return (1); 221 } 222
Indexes created Tue Sep 23 14:10:03 GMT 2025