1 /* $NetBSD: r2025.c,v 1.4 2008/04/06 20:25:59 cegger 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 1.4 2008/04/06 20:25:59 cegger 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 aprint_error_dev(&sc->sc_dev, "r2025rtc_gettime: failed to read registers.\n"); 118 return -1; 119 } 120 121 if (r2025rtc_reg_read(sc, R2025_REG_SEC, &bcd[0], R2025_CLK_SIZE) 122 != 0) { 123 aprint_error_dev(&sc->sc_dev, "r2025rtc_gettime: failed to read registers.\n"); 124 return -1; 125 } 126 127 dt.dt_sec = FROMBCD(bcd[R2025_REG_SEC] & R2025_REG_SEC_MASK); 128 dt.dt_min = FROMBCD(bcd[R2025_REG_MIN] & R2025_REG_MIN_MASK); 129 hour = FROMBCD(bcd[R2025_REG_HOUR] & R2025_REG_HOUR_MASK); 130 if (rctrl & R2025_REG_CTRL1_H1224) { 131 dt.dt_hour = hour; 132 } else { 133 if (hour == 12) { 134 dt.dt_hour = 0; 135 } else if (hour == 32) { 136 dt.dt_hour = 12; 137 } else if (hour > 13) { 138 dt.dt_hour = (hour - 8); 139 } else { /* (hour < 12) */ 140 dt.dt_hour = hour; 141 } 142 } 143 dt.dt_wday = FROMBCD(bcd[R2025_REG_WDAY] & R2025_REG_WDAY_MASK); 144 dt.dt_day = FROMBCD(bcd[R2025_REG_DAY] & R2025_REG_DAY_MASK); 145 dt.dt_mon = FROMBCD(bcd[R2025_REG_MON] & R2025_REG_MON_MASK); 146 dt.dt_year = FROMBCD(bcd[R2025_REG_YEAR] & R2025_REG_YEAR_MASK) 147 + ((bcd[R2025_REG_MON] & R2025_REG_MON_Y1920) ? 2000 : 1900); 148 149 tv->tv_sec = clock_ymdhms_to_secs(&dt); 150 tv->tv_usec = 0; 151 152 return 0; 153 } 154 155 static int 156 r2025rtc_settime(struct todr_chip_handle *ch, volatile struct timeval *tv) 157 { 158 struct r2025rtc_softc *sc = ch->cookie; 159 struct clock_ymdhms dt; 160 uint8_t rctrl; 161 uint8_t bcd[R2025_CLK_SIZE]; 162 163 clock_secs_to_ymdhms(tv->tv_sec, &dt); 164 165 /* Y3K problem */ 166 if (dt.dt_year >= 3000) { 167 aprint_error_dev(&sc->sc_dev, "r2025rtc_settime: " 168 "RTC does not support year 3000 or over.\n"); 169 return -1; 170 } 171 172 if (r2025rtc_reg_read(sc, R2025_REG_CTRL1, &rctrl, 1) != 0) { 173 aprint_error_dev(&sc->sc_dev, "r2025rtc_settime: failed to read register.\n"); 174 return -1; 175 } 176 rctrl |= R2025_REG_CTRL1_H1224; 177 178 /* setup registers 0x00-0x06 (7 byte) */ 179 bcd[R2025_REG_SEC] = TOBCD(dt.dt_sec) & R2025_REG_SEC_MASK; 180 bcd[R2025_REG_MIN] = TOBCD(dt.dt_min) & R2025_REG_MIN_MASK; 181 bcd[R2025_REG_HOUR] = TOBCD(dt.dt_hour) & R2025_REG_HOUR_MASK; 182 bcd[R2025_REG_WDAY] = TOBCD(dt.dt_wday) & R2025_REG_WDAY_MASK; 183 bcd[R2025_REG_DAY] = TOBCD(dt.dt_day) & R2025_REG_DAY_MASK; 184 bcd[R2025_REG_MON] = (TOBCD(dt.dt_mon) & R2025_REG_MON_MASK) 185 | ((dt.dt_year >= 2000) ? R2025_REG_MON_Y1920 : 0); 186 bcd[R2025_REG_YEAR] = TOBCD(dt.dt_year % 100) & R2025_REG_YEAR_MASK; 187 188 /* Write RTC register */ 189 if (r2025rtc_reg_write(sc, R2025_REG_CTRL1, &rctrl, 1) != 0) { 190 aprint_error_dev(&sc->sc_dev, "r2025rtc_settime: failed to write registers.\n"); 191 return -1; 192 } 193 if (r2025rtc_reg_write(sc, R2025_REG_SEC, bcd, R2025_CLK_SIZE) != 0) { 194 aprint_error_dev(&sc->sc_dev, "r2025rtc_settime: failed to write registers.\n"); 195 return -1; 196 } 197 198 return 0; 199 } 200 201 static int 202 r2025rtc_reg_write(struct r2025rtc_softc *sc, int reg, uint8_t *val, int len) 203 { 204 int i; 205 uint8_t buf[1]; 206 uint8_t cmdbuf[1]; 207 208 if (iic_acquire_bus(sc->sc_tag, I2C_F_POLL)) { 209 aprint_error_dev(&sc->sc_dev, "r2025rtc_clock_write: failed to acquire I2C bus\n"); 210 return -1; 211 } 212 213 for (i = 0 ; i < len ; i++) { 214 cmdbuf[0] = (((reg + i) << 4) & 0xf0); 215 buf[0] = val[i]; 216 if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, sc->sc_address, 217 cmdbuf, 1, buf, 1, I2C_F_POLL)) { 218 iic_release_bus(sc->sc_tag, I2C_F_POLL); 219 aprint_error_dev(&sc->sc_dev, "r2025rtc_reg_write: " 220 "failed to write registers\n"); 221 return -1; 222 } 223 } 224 225 iic_release_bus(sc->sc_tag, I2C_F_POLL); 226 227 return 0; 228 } 229 230 static int 231 r2025rtc_reg_read(struct r2025rtc_softc *sc, int reg, uint8_t *val, int len) 232 { 233 int i; 234 uint8_t buf[1]; 235 uint8_t cmdbuf[1]; 236 237 if (iic_acquire_bus(sc->sc_tag, I2C_F_POLL)) { 238 aprint_error_dev(&sc->sc_dev, "r2025rtc_clock_read: failed to acquire I2C bus\n"); 239 return -1; 240 } 241 242 for (i = 0 ; i < len ; i++) { 243 cmdbuf[0] = (((reg + i) << 4) & 0xf0); 244 buf[0] = 0; 245 if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_address, 246 cmdbuf, 1, buf, 1, I2C_F_POLL)) { 247 iic_release_bus(sc->sc_tag, I2C_F_POLL); 248 aprint_error_dev(&sc->sc_dev, "r2025rtc_reg_read: " 249 "failed to write registers\n"); 250 return -1; 251 } 252 253 *(val + i) = buf[0]; 254 } 255 256 iic_release_bus(sc->sc_tag, I2C_F_POLL); 257 258 return 0; 259 } 260