rs5c372.c revision 1.11
1 /* $NetBSD: rs5c372.c,v 1.11 2011/05/28 13:59:31 phx 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 1.11 2011/05/28 13:59:31 phx 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 device_t 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(device_t, cfdata_t, void *); 54 static void rs5c372rtc_attach(device_t, device_t, void *); 55 56 CFATTACH_DECL_NEW(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 *, struct timeval *); 63 static int rs5c372rtc_settime(struct todr_chip_handle *, struct timeval *); 64 65 static int 66 rs5c372rtc_match(device_t parent, cfdata_t cf, void *arg) 67 { 68 struct i2c_attach_args *ia = arg; 69 70 if (ia->ia_name) { 71 /* direct config - check name */ 72 if (strcmp(ia->ia_name, "rs5c372rtc") == 0) 73 return 1; 74 } else { 75 /* indirect config - check typical address */ 76 if (ia->ia_addr == RS5C372_ADDR) 77 return 1; 78 } 79 return 0; 80 } 81 82 static void 83 rs5c372rtc_attach(device_t parent, device_t self, void *arg) 84 { 85 struct rs5c372rtc_softc *sc = device_private(self); 86 struct i2c_attach_args *ia = arg; 87 88 aprint_naive(": Real-time Clock\n"); 89 aprint_normal(": RICOH RS5C372[AB] Real-time Clock\n"); 90 91 sc->sc_tag = ia->ia_tag; 92 sc->sc_address = ia->ia_addr; 93 sc->sc_dev = self; 94 sc->sc_todr.cookie = sc; 95 sc->sc_todr.todr_gettime = rs5c372rtc_gettime; 96 sc->sc_todr.todr_settime = rs5c372rtc_settime; 97 sc->sc_todr.todr_setwen = NULL; 98 99 todr_attach(&sc->sc_todr); 100 101 /* Initialize RTC */ 102 rs5c372rtc_reg_write(sc, RS5C372_CONTROL2, RS5C372_CONTROL2_24HRS); 103 rs5c372rtc_reg_write(sc, RS5C372_CONTROL1, 0); 104 } 105 106 static int 107 rs5c372rtc_gettime(struct todr_chip_handle *ch, struct timeval *tv) 108 { 109 struct rs5c372rtc_softc *sc = ch->cookie; 110 struct clock_ymdhms dt; 111 112 memset(&dt, 0, sizeof(dt)); 113 114 if (rs5c372rtc_clock_read(sc, &dt) == 0) 115 return (-1); 116 117 tv->tv_sec = clock_ymdhms_to_secs(&dt); 118 tv->tv_usec = 0; 119 120 return (0); 121 } 122 123 static int 124 rs5c372rtc_settime(struct todr_chip_handle *ch, struct timeval *tv) 125 { 126 struct rs5c372rtc_softc *sc = ch->cookie; 127 struct clock_ymdhms dt; 128 129 clock_secs_to_ymdhms(tv->tv_sec, &dt); 130 131 if (rs5c372rtc_clock_write(sc, &dt) == 0) 132 return (-1); 133 134 return (0); 135 } 136 137 static void 138 rs5c372rtc_reg_write(struct rs5c372rtc_softc *sc, int reg, uint8_t val) 139 { 140 uint8_t cmdbuf[2]; 141 142 if (iic_acquire_bus(sc->sc_tag, I2C_F_POLL)) { 143 aprint_error_dev(sc->sc_dev, 144 "rs5c372rtc_reg_write: failed to acquire I2C bus\n"); 145 return; 146 } 147 148 reg &= 0xf; 149 cmdbuf[0] = (reg << 4); 150 cmdbuf[1] = val; 151 if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, sc->sc_address, 152 cmdbuf, 1, &cmdbuf[1], 1, I2C_F_POLL)) { 153 iic_release_bus(sc->sc_tag, I2C_F_POLL); 154 aprint_error_dev(sc->sc_dev, 155 "rs5c372rtc_reg_write: failed to write reg%d\n", reg); 156 return; 157 } 158 159 iic_release_bus(sc->sc_tag, I2C_F_POLL); 160 } 161 162 static int 163 rs5c372rtc_clock_read(struct rs5c372rtc_softc *sc, struct clock_ymdhms *dt) 164 { 165 uint8_t bcd[RS5C372_NRTC_REGS]; 166 uint8_t cmdbuf[1]; 167 168 if (iic_acquire_bus(sc->sc_tag, I2C_F_POLL)) { 169 aprint_error_dev(sc->sc_dev, 170 "rs5c372rtc_clock_read: failed to acquire I2C bus\n"); 171 return (0); 172 } 173 174 cmdbuf[0] = (RS5C372_SECONDS << 4); 175 if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_address, 176 cmdbuf, 1, bcd, RS5C372_NRTC_REGS, I2C_F_POLL)) { 177 iic_release_bus(sc->sc_tag, I2C_F_POLL); 178 aprint_error_dev(sc->sc_dev, 179 "rs5c372rtc_clock_read: failed to read rtc\n"); 180 return (0); 181 } 182 183 iic_release_bus(sc->sc_tag, I2C_F_POLL); 184 185 /* 186 * Convert the RS5C372's register values into something useable 187 */ 188 dt->dt_sec = FROMBCD(bcd[RS5C372_SECONDS] & RS5C372_SECONDS_MASK); 189 dt->dt_min = FROMBCD(bcd[RS5C372_MINUTES] & RS5C372_MINUTES_MASK); 190 dt->dt_hour = FROMBCD(bcd[RS5C372_HOURS] & RS5C372_HOURS_24MASK); 191 dt->dt_day = FROMBCD(bcd[RS5C372_DATE] & RS5C372_DATE_MASK); 192 dt->dt_mon = FROMBCD(bcd[RS5C372_MONTH] & RS5C372_MONTH_MASK); 193 dt->dt_year = FROMBCD(bcd[RS5C372_YEAR]) + 2000; 194 195 return (1); 196 } 197 198 static int 199 rs5c372rtc_clock_write(struct rs5c372rtc_softc *sc, struct clock_ymdhms *dt) 200 { 201 uint8_t bcd[RS5C372_NRTC_REGS]; 202 uint8_t cmdbuf[1]; 203 204 /* 205 * Convert our time representation into something the RS5C372 206 * can understand. 207 */ 208 bcd[RS5C372_SECONDS] = TOBCD(dt->dt_sec); 209 bcd[RS5C372_MINUTES] = TOBCD(dt->dt_min); 210 bcd[RS5C372_HOURS] = TOBCD(dt->dt_hour); 211 bcd[RS5C372_DATE] = TOBCD(dt->dt_day); 212 bcd[RS5C372_DAY] = TOBCD(dt->dt_wday); 213 bcd[RS5C372_MONTH] = TOBCD(dt->dt_mon); 214 bcd[RS5C372_YEAR] = TOBCD(dt->dt_year % 100); 215 216 if (iic_acquire_bus(sc->sc_tag, I2C_F_POLL)) { 217 aprint_error_dev(sc->sc_dev, "rs5c372rtc_clock_write: failed to " 218 "acquire I2C bus\n"); 219 return (0); 220 } 221 222 cmdbuf[0] = (RS5C372_SECONDS << 4); 223 if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, sc->sc_address, 224 cmdbuf, 1, bcd, RS5C372_NRTC_REGS, I2C_F_POLL)) { 225 iic_release_bus(sc->sc_tag, I2C_F_POLL); 226 aprint_error_dev(sc->sc_dev, 227 "rs5c372rtc_clock_write: failed to write rtc\n"); 228 return (0); 229 } 230 231 iic_release_bus(sc->sc_tag, I2C_F_POLL); 232 233 return (1); 234 } 235
Indexes created Wed Sep 24 05:09:52 GMT 2025