1 /* $NetBSD: r2025.c,v 1.12 2025/09/07 21:45:15 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 2006 Shigeyuki Fukushima. 5 * All rights reserved. 6 * 7 * Written by Shigeyuki Fukushima. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above 15 * copyright notice, this list of conditions and the following 16 * disclaimer in the documentation and/or other materials provided 17 * with the distribution. 18 * 3. The name of the author may not be used to endorse or promote 19 * products derived from this software without specific prior 20 * written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS 23 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 24 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY 26 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE 28 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 29 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 30 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 31 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 32 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 __KERNEL_RCSID(0, "$NetBSD: r2025.c,v 1.12 2025/09/07 21:45:15 thorpej Exp $"); 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/device.h> 41 #include <sys/kernel.h> 42 #include <sys/fcntl.h> 43 #include <sys/uio.h> 44 #include <sys/conf.h> 45 #include <sys/event.h> 46 47 #include <dev/clock_subr.h> 48 49 #include <dev/i2c/i2cvar.h> 50 #include <dev/i2c/r2025reg.h> 51 52 struct r2025rtc_softc { 53 device_t sc_dev; 54 i2c_tag_t sc_tag; 55 int sc_address; 56 int sc_open; 57 struct todr_chip_handle sc_todr; 58 }; 59 60 static void r2025rtc_attach(device_t, device_t, void *); 61 static int r2025rtc_match(device_t, cfdata_t, void *); 62 63 CFATTACH_DECL_NEW(r2025rtc, sizeof(struct r2025rtc_softc), 64 r2025rtc_match, r2025rtc_attach, NULL, NULL); 65 66 static int r2025rtc_gettime_ymdhms(struct todr_chip_handle *, 67 struct clock_ymdhms *); 68 static int r2025rtc_settime_ymdhms(struct todr_chip_handle *, 69 struct clock_ymdhms *); 70 static int r2025rtc_reg_write(struct r2025rtc_softc *, int, uint8_t*, int); 71 static int r2025rtc_reg_read(struct r2025rtc_softc *, int, uint8_t*, int); 72 73 74 static int 75 r2025rtc_match(device_t parent, cfdata_t cf, void *arg) 76 { 77 struct i2c_attach_args *ia = arg; 78 79 /* match only R2025 RTC devices */ 80 if (ia->ia_addr == R2025_ADDR) 81 return I2C_MATCH_ADDRESS_ONLY; 82 83 return 0; 84 } 85 86 static void 87 r2025rtc_attach(device_t parent, device_t self, void *arg) 88 { 89 struct r2025rtc_softc *sc = device_private(self); 90 struct i2c_attach_args *ia = arg; 91 92 aprint_normal(": RICOH R2025S/D Real-time Clock\n"); 93 94 sc->sc_tag = ia->ia_tag; 95 sc->sc_address = ia->ia_addr; 96 sc->sc_dev = self; 97 sc->sc_open = 0; 98 sc->sc_todr.todr_dev = self; 99 sc->sc_todr.todr_gettime_ymdhms = r2025rtc_gettime_ymdhms; 100 sc->sc_todr.todr_settime_ymdhms = r2025rtc_settime_ymdhms; 101 102 todr_attach(&sc->sc_todr); 103 } 104 105 static int 106 r2025rtc_gettime_ymdhms(struct todr_chip_handle *ch, struct clock_ymdhms *dt) 107 { 108 struct r2025rtc_softc *sc = device_private(ch->todr_dev); 109 uint8_t rctrl; 110 uint8_t bcd[R2025_CLK_SIZE]; 111 int hour; 112 int error; 113 114 memset(dt, 0, sizeof(*dt)); 115 116 if ((error = r2025rtc_reg_read(sc, R2025_REG_CTRL1, &rctrl, 1)) != 0) { 117 aprint_error_dev(sc->sc_dev, 118 "r2025rtc_gettime: failed to read registers.\n"); 119 return error; 120 } 121 122 if ((error = r2025rtc_reg_read(sc, R2025_REG_SEC, &bcd[0], 123 R2025_CLK_SIZE)) != 0) { 124 aprint_error_dev(sc->sc_dev, 125 "r2025rtc_gettime: failed to read registers.\n"); 126 return error; 127 } 128 129 dt->dt_sec = bcdtobin(bcd[R2025_REG_SEC] & R2025_REG_SEC_MASK); 130 dt->dt_min = bcdtobin(bcd[R2025_REG_MIN] & R2025_REG_MIN_MASK); 131 hour = bcdtobin(bcd[R2025_REG_HOUR] & R2025_REG_HOUR_MASK); 132 if (rctrl & R2025_REG_CTRL1_H1224) { 133 dt->dt_hour = hour; 134 } else { 135 if (hour == 12) { 136 dt->dt_hour = 0; 137 } else if (hour == 32) { 138 dt->dt_hour = 12; 139 } else if (hour > 13) { 140 dt->dt_hour = (hour - 8); 141 } else { /* (hour < 12) */ 142 dt->dt_hour = hour; 143 } 144 } 145 dt->dt_wday = bcdtobin(bcd[R2025_REG_WDAY] & R2025_REG_WDAY_MASK); 146 dt->dt_day = bcdtobin(bcd[R2025_REG_DAY] & R2025_REG_DAY_MASK); 147 dt->dt_mon = bcdtobin(bcd[R2025_REG_MON] & R2025_REG_MON_MASK); 148 dt->dt_year = bcdtobin(bcd[R2025_REG_YEAR] & R2025_REG_YEAR_MASK) 149 + ((bcd[R2025_REG_MON] & R2025_REG_MON_Y1920) ? 2000 : 1900); 150 151 return 0; 152 } 153 154 static int 155 r2025rtc_settime_ymdhms(struct todr_chip_handle *ch, struct clock_ymdhms *dt) 156 { 157 struct r2025rtc_softc *sc = device_private(ch->todr_dev); 158 uint8_t rctrl; 159 uint8_t bcd[R2025_CLK_SIZE]; 160 int error; 161 162 /* Y3K problem */ 163 if (dt->dt_year >= 3000) { 164 aprint_error_dev(sc->sc_dev, 165 "r2025rtc_settime: " 166 "RTC does not support year 3000 or over.\n"); 167 return EINVAL; 168 } 169 170 if ((error = r2025rtc_reg_read(sc, R2025_REG_CTRL1, &rctrl, 1)) != 0) { 171 aprint_error_dev(sc->sc_dev, 172 "r2025rtc_settime: failed to read register.\n"); 173 return error; 174 } 175 rctrl |= R2025_REG_CTRL1_H1224; 176 177 /* setup registers 0x00-0x06 (7 byte) */ 178 bcd[R2025_REG_SEC] = bintobcd(dt->dt_sec) & R2025_REG_SEC_MASK; 179 bcd[R2025_REG_MIN] = bintobcd(dt->dt_min) & R2025_REG_MIN_MASK; 180 bcd[R2025_REG_HOUR] = bintobcd(dt->dt_hour) & R2025_REG_HOUR_MASK; 181 bcd[R2025_REG_WDAY] = bintobcd(dt->dt_wday) & R2025_REG_WDAY_MASK; 182 bcd[R2025_REG_DAY] = bintobcd(dt->dt_day) & R2025_REG_DAY_MASK; 183 bcd[R2025_REG_MON] = (bintobcd(dt->dt_mon) & R2025_REG_MON_MASK) 184 | ((dt->dt_year >= 2000) ? R2025_REG_MON_Y1920 : 0); 185 bcd[R2025_REG_YEAR] = bintobcd(dt->dt_year % 100) & R2025_REG_YEAR_MASK; 186 187 /* Write RTC register */ 188 if ((error = r2025rtc_reg_write(sc, R2025_REG_CTRL1, &rctrl, 1)) != 0) { 189 aprint_error_dev(sc->sc_dev, 190 "r2025rtc_settime: failed to write registers.\n"); 191 return error; 192 } 193 if ((error = r2025rtc_reg_write(sc, R2025_REG_SEC, bcd, 194 R2025_CLK_SIZE)) != 0) { 195 aprint_error_dev(sc->sc_dev, 196 "r2025rtc_settime: failed to write registers.\n"); 197 return error; 198 } 199 200 return 0; 201 } 202 203 static int 204 r2025rtc_reg_write(struct r2025rtc_softc *sc, int reg, uint8_t *val, int len) 205 { 206 int i; 207 uint8_t buf[1]; 208 uint8_t cmdbuf[1]; 209 int error; 210 211 if ((error = iic_acquire_bus(sc->sc_tag, 0)) != 0) { 212 aprint_error_dev(sc->sc_dev, 213 "r2025rtc_reg_write: failed to acquire I2C bus\n"); 214 return error; 215 } 216 217 for (i = 0 ; i < len ; i++) { 218 cmdbuf[0] = (((reg + i) << 4) & 0xf0); 219 buf[0] = val[i]; 220 if ((error = iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, 221 sc->sc_address, cmdbuf, 1, buf, 1, 222 0)) != 0) { 223 iic_release_bus(sc->sc_tag, 0); 224 aprint_error_dev(sc->sc_dev, "r2025rtc_reg_write: " 225 "failed to write registers\n"); 226 return error; 227 } 228 } 229 230 iic_release_bus(sc->sc_tag, 0); 231 232 return 0; 233 } 234 235 static int 236 r2025rtc_reg_read(struct r2025rtc_softc *sc, int reg, uint8_t *val, int len) 237 { 238 int i; 239 uint8_t buf[1]; 240 uint8_t cmdbuf[1]; 241 int error; 242 243 if ((error = iic_acquire_bus(sc->sc_tag, 0)) != 0) { 244 aprint_error_dev(sc->sc_dev, 245 "r2025rtc_reg_read: failed to acquire I2C bus\n"); 246 return error; 247 } 248 249 for (i = 0 ; i < len ; i++) { 250 cmdbuf[0] = (((reg + i) << 4) & 0xf0); 251 buf[0] = 0; 252 if ((error = iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, 253 sc->sc_address, cmdbuf, 1, buf, 1, 254 0)) != 0) { 255 iic_release_bus(sc->sc_tag, 0); 256 aprint_error_dev(sc->sc_dev, "r2025rtc_reg_read: " 257 "failed to read registers\n"); 258 return error; 259 } 260 261 *(val + i) = buf[0]; 262 } 263 264 iic_release_bus(sc->sc_tag, 0); 265 266 return 0; 267 } 268
Indexes created Fri Sep 26 20:09:58 GMT 2025