1 /* $NetBSD: r2025.c,v 1.3 2006/09/04 23:45:30 gdamore 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 1.3 2006/09/04 23:45:30 gdamore 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 struct device 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(struct device *, struct device *, void *); 61 static int r2025rtc_match(struct device *, struct cfdata *, void *); 62 63 CFATTACH_DECL(r2025rtc, sizeof(struct r2025rtc_softc), 64 r2025rtc_match, r2025rtc_attach, NULL, NULL); 65 66 static int r2025rtc_gettime(struct todr_chip_handle *, 67 volatile struct timeval *); 68 static int r2025rtc_settime(struct todr_chip_handle *, 69 volatile struct timeval *); 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(struct device *parent, struct cfdata *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 1; 82 83 return 0; 84 } 85 86 static void 87 r2025rtc_attach(struct device *parent, struct device *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_open = 0; 97 sc->sc_todr.cookie = sc; 98 sc->sc_todr.todr_gettime = r2025rtc_gettime; 99 sc->sc_todr.todr_settime = r2025rtc_settime; 100 sc->sc_todr.todr_setwen = NULL; 101 102 todr_attach(&sc->sc_todr); 103 } 104 105 static int 106 r2025rtc_gettime(struct todr_chip_handle *ch, volatile struct timeval *tv) 107 { 108 struct r2025rtc_softc *sc = ch->cookie; 109 struct clock_ymdhms dt; 110 uint8_t rctrl; 111 uint8_t bcd[R2025_CLK_SIZE]; 112 int hour; 113 114 memset(&dt, 0, sizeof(dt)); 115 116 if (r2025rtc_reg_read(sc, R2025_REG_CTRL1, &rctrl, 1) != 0) { 117 printf("%s: r2025rtc_gettime: failed to read registers.\n", 118 sc->sc_dev.dv_xname); 119 return -1; 120 } 121 122 if (r2025rtc_reg_read(sc, R2025_REG_SEC, &bcd[0], R2025_CLK_SIZE) 123 != 0) { 124 printf("%s: r2025rtc_gettime: failed to read registers.\n", 125 sc->sc_dev.dv_xname); 126 return -1; 127 } 128 129 dt.dt_sec = FROMBCD(bcd[R2025_REG_SEC] & R2025_REG_SEC_MASK); 130 dt.dt_min = FROMBCD(bcd[R2025_REG_MIN] & R2025_REG_MIN_MASK); 131 hour = FROMBCD(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 = FROMBCD(bcd[R2025_REG_WDAY] & R2025_REG_WDAY_MASK); 146 dt.dt_day = FROMBCD(bcd[R2025_REG_DAY] & R2025_REG_DAY_MASK); 147 dt.dt_mon = FROMBCD(bcd[R2025_REG_MON] & R2025_REG_MON_MASK); 148 dt.dt_year = FROMBCD(bcd[R2025_REG_YEAR] & R2025_REG_YEAR_MASK) 149 + ((bcd[R2025_REG_MON] & R2025_REG_MON_Y1920) ? 2000 : 1900); 150 151 tv->tv_sec = clock_ymdhms_to_secs(&dt); 152 tv->tv_usec = 0; 153 154 return 0; 155 } 156 157 static int 158 r2025rtc_settime(struct todr_chip_handle *ch, volatile struct timeval *tv) 159 { 160 struct r2025rtc_softc *sc = ch->cookie; 161 struct clock_ymdhms dt; 162 uint8_t rctrl; 163 uint8_t bcd[R2025_CLK_SIZE]; 164 165 clock_secs_to_ymdhms(tv->tv_sec, &dt); 166 167 /* Y3K problem */ 168 if (dt.dt_year >= 3000) { 169 printf("%s: r2025rtc_settime: " 170 "RTC does not support year 3000 or over.\n", 171 sc->sc_dev.dv_xname); 172 return -1; 173 } 174 175 if (r2025rtc_reg_read(sc, R2025_REG_CTRL1, &rctrl, 1) != 0) { 176 printf("%s: r2025rtc_settime: failed to read register.\n", 177 sc->sc_dev.dv_xname); 178 return -1; 179 } 180 rctrl |= R2025_REG_CTRL1_H1224; 181 182 /* setup registers 0x00-0x06 (7 byte) */ 183 bcd[R2025_REG_SEC] = TOBCD(dt.dt_sec) & R2025_REG_SEC_MASK; 184 bcd[R2025_REG_MIN] = TOBCD(dt.dt_min) & R2025_REG_MIN_MASK; 185 bcd[R2025_REG_HOUR] = TOBCD(dt.dt_hour) & R2025_REG_HOUR_MASK; 186 bcd[R2025_REG_WDAY] = TOBCD(dt.dt_wday) & R2025_REG_WDAY_MASK; 187 bcd[R2025_REG_DAY] = TOBCD(dt.dt_day) & R2025_REG_DAY_MASK; 188 bcd[R2025_REG_MON] = (TOBCD(dt.dt_mon) & R2025_REG_MON_MASK) 189 | ((dt.dt_year >= 2000) ? R2025_REG_MON_Y1920 : 0); 190 bcd[R2025_REG_YEAR] = TOBCD(dt.dt_year % 100) & R2025_REG_YEAR_MASK; 191 192 /* Write RTC register */ 193 if (r2025rtc_reg_write(sc, R2025_REG_CTRL1, &rctrl, 1) != 0) { 194 printf("%s: r2025rtc_settime: failed to write registers.\n", 195 sc->sc_dev.dv_xname); 196 return -1; 197 } 198 if (r2025rtc_reg_write(sc, R2025_REG_SEC, bcd, R2025_CLK_SIZE) != 0) { 199 printf("%s: r2025rtc_settime: failed to write registers.\n", 200 sc->sc_dev.dv_xname); 201 return -1; 202 } 203 204 return 0; 205 } 206 207 static int 208 r2025rtc_reg_write(struct r2025rtc_softc *sc, int reg, uint8_t *val, int len) 209 { 210 int i; 211 uint8_t buf[1]; 212 uint8_t cmdbuf[1]; 213 214 if (iic_acquire_bus(sc->sc_tag, I2C_F_POLL)) { 215 printf("%s: r2025rtc_clock_write: failed to acquire I2C bus\n", 216 sc->sc_dev.dv_xname); 217 return -1; 218 } 219 220 for (i = 0 ; i < len ; i++) { 221 cmdbuf[0] = (((reg + i) << 4) & 0xf0); 222 buf[0] = val[i]; 223 if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, sc->sc_address, 224 cmdbuf, 1, buf, 1, I2C_F_POLL)) { 225 iic_release_bus(sc->sc_tag, I2C_F_POLL); 226 printf("%s: r2025rtc_reg_write: " 227 "failed to write registers\n", 228 sc->sc_dev.dv_xname); 229 return -1; 230 } 231 } 232 233 iic_release_bus(sc->sc_tag, I2C_F_POLL); 234 235 return 0; 236 } 237 238 static int 239 r2025rtc_reg_read(struct r2025rtc_softc *sc, int reg, uint8_t *val, int len) 240 { 241 int i; 242 uint8_t buf[1]; 243 uint8_t cmdbuf[1]; 244 245 if (iic_acquire_bus(sc->sc_tag, I2C_F_POLL)) { 246 printf("%s: r2025rtc_clock_read: failed to acquire I2C bus\n", 247 sc->sc_dev.dv_xname); 248 return -1; 249 } 250 251 for (i = 0 ; i < len ; i++) { 252 cmdbuf[0] = (((reg + i) << 4) & 0xf0); 253 buf[0] = 0; 254 if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_address, 255 cmdbuf, 1, buf, 1, I2C_F_POLL)) { 256 iic_release_bus(sc->sc_tag, I2C_F_POLL); 257 printf("%s: r2025rtc_reg_read: " 258 "failed to write registers\n", 259 sc->sc_dev.dv_xname); 260 return -1; 261 } 262 263 *(val + i) = buf[0]; 264 } 265 266 iic_release_bus(sc->sc_tag, I2C_F_POLL); 267 268 return 0; 269 } 270