1 /* $NetBSD: rs5c372.c,v 1.14 2014/11/20 16:34:26 christos Exp $ */ 2 3 /*- 4 * Copyright (C) 2005 NONAKA Kimihiro <nonaka@netbsd.org> 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 THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __KERNEL_RCSID(0, "$NetBSD: rs5c372.c,v 1.14 2014/11/20 16:34:26 christos Exp $"); 30 31 #include <sys/param.h> 32 #include <sys/systm.h> 33 #include <sys/device.h> 34 #include <sys/kernel.h> 35 #include <sys/fcntl.h> 36 #include <sys/uio.h> 37 #include <sys/conf.h> 38 #include <sys/event.h> 39 40 #include <dev/clock_subr.h> 41 42 #include <dev/i2c/i2cvar.h> 43 #include <dev/i2c/rs5c372reg.h> 44 45 struct rs5c372rtc_softc { 46 device_t sc_dev; 47 i2c_tag_t sc_tag; 48 int sc_address; 49 struct todr_chip_handle sc_todr; 50 }; 51 52 static int rs5c372rtc_match(device_t, cfdata_t, void *); 53 static void rs5c372rtc_attach(device_t, device_t, void *); 54 55 CFATTACH_DECL_NEW(rs5c372rtc, sizeof(struct rs5c372rtc_softc), 56 rs5c372rtc_match, rs5c372rtc_attach, NULL, NULL); 57 58 static void rs5c372rtc_reg_write(struct rs5c372rtc_softc *, int, uint8_t); 59 static int rs5c372rtc_clock_read(struct rs5c372rtc_softc *, struct clock_ymdhms *); 60 static int rs5c372rtc_clock_write(struct rs5c372rtc_softc *, struct clock_ymdhms *); 61 static int rs5c372rtc_gettime_ymdhms(todr_chip_handle_t, struct clock_ymdhms *); 62 static int rs5c372rtc_settime_ymdhms(todr_chip_handle_t, struct clock_ymdhms *); 63 64 static int 65 rs5c372rtc_match(device_t parent, cfdata_t cf, void *arg) 66 { 67 struct i2c_attach_args *ia = arg; 68 69 if (ia->ia_name) { 70 /* direct config - check name */ 71 if (strcmp(ia->ia_name, "rs5c372rtc") == 0) 72 return 1; 73 } else { 74 /* indirect config - check typical address */ 75 if (ia->ia_addr == RS5C372_ADDR) 76 return 1; 77 } 78 return 0; 79 } 80 81 static void 82 rs5c372rtc_attach(device_t parent, device_t self, void *arg) 83 { 84 struct rs5c372rtc_softc *sc = device_private(self); 85 struct i2c_attach_args *ia = arg; 86 87 aprint_naive(": Real-time Clock\n"); 88 aprint_normal(": RICOH RS5C372[AB] Real-time Clock\n"); 89 90 sc->sc_tag = ia->ia_tag; 91 sc->sc_address = ia->ia_addr; 92 sc->sc_dev = self; 93 sc->sc_todr.cookie = sc; 94 sc->sc_todr.todr_gettime_ymdhms = rs5c372rtc_gettime_ymdhms; 95 sc->sc_todr.todr_settime_ymdhms = rs5c372rtc_settime_ymdhms; 96 sc->sc_todr.todr_setwen = NULL; 97 98 todr_attach(&sc->sc_todr); 99 100 /* Initialize RTC */ 101 rs5c372rtc_reg_write(sc, RS5C372_CONTROL2, RS5C372_CONTROL2_24HRS); 102 rs5c372rtc_reg_write(sc, RS5C372_CONTROL1, 0); 103 } 104 105 static int 106 rs5c372rtc_gettime_ymdhms(todr_chip_handle_t ch, struct clock_ymdhms *dt) 107 { 108 struct rs5c372rtc_softc *sc = ch->cookie; 109 110 if (rs5c372rtc_clock_read(sc, dt) == 0) 111 return (-1); 112 113 return (0); 114 } 115 116 static int 117 rs5c372rtc_settime_ymdhms(todr_chip_handle_t ch, struct clock_ymdhms *dt) 118 { 119 struct rs5c372rtc_softc *sc = ch->cookie; 120 121 if (rs5c372rtc_clock_write(sc, dt) == 0) 122 return (-1); 123 124 return (0); 125 } 126 127 static void 128 rs5c372rtc_reg_write(struct rs5c372rtc_softc *sc, int reg, uint8_t val) 129 { 130 uint8_t cmdbuf[2]; 131 132 if (iic_acquire_bus(sc->sc_tag, I2C_F_POLL)) { 133 aprint_error_dev(sc->sc_dev, 134 "rs5c372rtc_reg_write: failed to acquire I2C bus\n"); 135 return; 136 } 137 138 reg &= 0xf; 139 cmdbuf[0] = (reg << 4); 140 cmdbuf[1] = val; 141 if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, sc->sc_address, 142 cmdbuf, 1, &cmdbuf[1], 1, I2C_F_POLL)) { 143 iic_release_bus(sc->sc_tag, I2C_F_POLL); 144 aprint_error_dev(sc->sc_dev, 145 "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, 160 "rs5c372rtc_clock_read: failed to acquire I2C bus\n"); 161 return (0); 162 } 163 164 cmdbuf[0] = (RS5C372_SECONDS << 4); 165 if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_address, 166 cmdbuf, 1, bcd, RS5C372_NRTC_REGS, I2C_F_POLL)) { 167 iic_release_bus(sc->sc_tag, I2C_F_POLL); 168 aprint_error_dev(sc->sc_dev, 169 "rs5c372rtc_clock_read: failed to read rtc\n"); 170 return (0); 171 } 172 173 iic_release_bus(sc->sc_tag, I2C_F_POLL); 174 175 /* 176 * Convert the RS5C372's register values into something useable 177 */ 178 dt->dt_sec = bcdtobin(bcd[RS5C372_SECONDS] & RS5C372_SECONDS_MASK); 179 dt->dt_min = bcdtobin(bcd[RS5C372_MINUTES] & RS5C372_MINUTES_MASK); 180 dt->dt_hour = bcdtobin(bcd[RS5C372_HOURS] & RS5C372_HOURS_24MASK); 181 dt->dt_day = bcdtobin(bcd[RS5C372_DATE] & RS5C372_DATE_MASK); 182 dt->dt_mon = bcdtobin(bcd[RS5C372_MONTH] & RS5C372_MONTH_MASK); 183 dt->dt_year = bcdtobin(bcd[RS5C372_YEAR]) + 2000; 184 185 return (1); 186 } 187 188 static int 189 rs5c372rtc_clock_write(struct rs5c372rtc_softc *sc, struct clock_ymdhms *dt) 190 { 191 uint8_t bcd[RS5C372_NRTC_REGS]; 192 uint8_t cmdbuf[1]; 193 194 /* 195 * Convert our time representation into something the RS5C372 196 * can understand. 197 */ 198 bcd[RS5C372_SECONDS] = bintobcd(dt->dt_sec); 199 bcd[RS5C372_MINUTES] = bintobcd(dt->dt_min); 200 bcd[RS5C372_HOURS] = bintobcd(dt->dt_hour); 201 bcd[RS5C372_DATE] = bintobcd(dt->dt_day); 202 bcd[RS5C372_DAY] = bintobcd(dt->dt_wday); 203 bcd[RS5C372_MONTH] = bintobcd(dt->dt_mon); 204 bcd[RS5C372_YEAR] = bintobcd(dt->dt_year % 100); 205 206 if (iic_acquire_bus(sc->sc_tag, I2C_F_POLL)) { 207 aprint_error_dev(sc->sc_dev, "rs5c372rtc_clock_write: failed to " 208 "acquire I2C bus\n"); 209 return (0); 210 } 211 212 cmdbuf[0] = (RS5C372_SECONDS << 4); 213 if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, sc->sc_address, 214 cmdbuf, 1, bcd, RS5C372_NRTC_REGS, I2C_F_POLL)) { 215 iic_release_bus(sc->sc_tag, I2C_F_POLL); 216 aprint_error_dev(sc->sc_dev, 217 "rs5c372rtc_clock_write: failed to write rtc\n"); 218 return (0); 219 } 220 221 iic_release_bus(sc->sc_tag, I2C_F_POLL); 222 223 return (1); 224 } 225