pcf8563.c revision 1.4.2.2
1 /* $NetBSD: pcf8563.c,v 1.4.2.2 2015/06/06 14:40:07 skrll Exp $ */ 2 3 /* 4 * Copyright (c) 2011 Jonathan A. Kollasch 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 COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND 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 THE COPYRIGHT HOLDER OR 20 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 21 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 23 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 24 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 25 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 26 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __KERNEL_RCSID(0, "$NetBSD: pcf8563.c,v 1.4.2.2 2015/06/06 14:40:07 skrll Exp $"); 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/device.h> 35 #include <sys/kernel.h> 36 37 #include <dev/clock_subr.h> 38 39 #include <dev/i2c/i2cvar.h> 40 #include <dev/i2c/pcf8563reg.h> 41 42 struct pcf8563rtc_softc { 43 device_t sc_dev; 44 i2c_tag_t sc_tag; 45 int sc_addr; 46 struct todr_chip_handle sc_todr; 47 }; 48 49 static int pcf8563rtc_match(device_t, cfdata_t, void *); 50 static void pcf8563rtc_attach(device_t, device_t, void *); 51 52 CFATTACH_DECL_NEW(pcf8563rtc, sizeof(struct pcf8563rtc_softc), 53 pcf8563rtc_match, pcf8563rtc_attach, NULL, NULL); 54 55 static int pcf8563rtc_clock_read(struct pcf8563rtc_softc *, struct clock_ymdhms *); 56 static int pcf8563rtc_clock_write(struct pcf8563rtc_softc *, struct clock_ymdhms *); 57 static int pcf8563rtc_gettime(struct todr_chip_handle *, struct clock_ymdhms *); 58 static int pcf8563rtc_settime(struct todr_chip_handle *, struct clock_ymdhms *); 59 60 static int 61 pcf8563rtc_match(device_t parent, cfdata_t cf, void *aux) 62 { 63 struct i2c_attach_args *ia = aux; 64 65 if (ia->ia_name) { 66 /* direct config - check name */ 67 if (strcmp(ia->ia_name, "pcf8563rtc") == 0) 68 return 1; 69 } else { 70 /* indirect config - check typical address */ 71 if (ia->ia_addr == PCF8563_ADDR) 72 return 1; 73 } 74 return 0; 75 } 76 77 static void 78 pcf8563rtc_attach(device_t parent, device_t self, void *aux) 79 { 80 struct pcf8563rtc_softc *sc = device_private(self); 81 struct i2c_attach_args *ia = aux; 82 83 aprint_naive(": Real-time Clock\n"); 84 aprint_normal(": NXP PCF8563 Real-time Clock\n"); 85 86 sc->sc_dev = self; 87 sc->sc_tag = ia->ia_tag; 88 sc->sc_addr = ia->ia_addr; 89 sc->sc_todr.cookie = sc; 90 sc->sc_todr.todr_gettime_ymdhms = pcf8563rtc_gettime; 91 sc->sc_todr.todr_settime_ymdhms = pcf8563rtc_settime; 92 sc->sc_todr.todr_setwen = NULL; 93 94 iic_acquire_bus(sc->sc_tag, I2C_F_POLL); 95 iic_smbus_write_byte(sc->sc_tag, sc->sc_addr, PCF8563_R_CS1, 0, 96 I2C_F_POLL); 97 iic_smbus_write_byte(sc->sc_tag, sc->sc_addr, PCF8563_R_CS2, 0, 98 I2C_F_POLL); 99 iic_release_bus(sc->sc_tag, I2C_F_POLL); 100 101 todr_attach(&sc->sc_todr); 102 } 103 104 static int 105 pcf8563rtc_gettime(struct todr_chip_handle *ch, struct clock_ymdhms *dt) 106 { 107 struct pcf8563rtc_softc *sc = ch->cookie; 108 109 if (pcf8563rtc_clock_read(sc, dt) == 0) 110 return -1; 111 112 return 0; 113 } 114 115 static int 116 pcf8563rtc_settime(struct todr_chip_handle *ch, struct clock_ymdhms *dt) 117 { 118 struct pcf8563rtc_softc *sc = ch->cookie; 119 120 if (pcf8563rtc_clock_write(sc, dt) == 0) 121 return -1; 122 123 return 0; 124 } 125 126 static int 127 pcf8563rtc_clock_read(struct pcf8563rtc_softc *sc, struct clock_ymdhms *dt) 128 { 129 uint8_t bcd[PCF8563_NREGS]; 130 uint8_t reg = PCF8563_R_SECOND; 131 const int flags = I2C_F_POLL; 132 133 if (iic_acquire_bus(sc->sc_tag, flags)) { 134 device_printf(sc->sc_dev, "acquire bus for read failed\n"); 135 return 0; 136 } 137 138 if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_addr, ®, 1, 139 &bcd[reg], PCF8563_R_YEAR - reg + 1, flags)) { 140 iic_release_bus(sc->sc_tag, flags); 141 device_printf(sc->sc_dev, "read failed\n"); 142 return 0; 143 } 144 145 iic_release_bus(sc->sc_tag, flags); 146 147 if (bcd[PCF8563_R_SECOND] & PCF8563_M_VL) 148 return 0; 149 150 dt->dt_sec = bcdtobin(bcd[PCF8563_R_SECOND] & PCF8563_M_SECOND); 151 dt->dt_min = bcdtobin(bcd[PCF8563_R_MINUTE] & PCF8563_M_MINUTE); 152 dt->dt_hour = bcdtobin(bcd[PCF8563_R_HOUR] & PCF8563_M_HOUR); 153 dt->dt_day = bcdtobin(bcd[PCF8563_R_DAY] & PCF8563_M_DAY); 154 dt->dt_wday = bcdtobin(bcd[PCF8563_R_WEEKDAY] & PCF8563_M_WEEKDAY); 155 dt->dt_mon = bcdtobin(bcd[PCF8563_R_MONTH] & PCF8563_M_MONTH); 156 dt->dt_year = 1900 + 157 (bcdtobin(bcd[PCF8563_R_YEAR] & PCF8563_M_YEAR) % 100); 158 if ((bcd[PCF8563_R_MONTH] & PCF8563_M_CENTURY) == 0) 159 dt->dt_year += 100; 160 161 return 1; 162 } 163 164 static int 165 pcf8563rtc_clock_write(struct pcf8563rtc_softc *sc, struct clock_ymdhms *dt) 166 { 167 uint8_t bcd[PCF8563_NREGS]; 168 uint8_t reg = PCF8563_R_SECOND; 169 const int flags = I2C_F_POLL; 170 171 bcd[PCF8563_R_SECOND] = bintobcd(dt->dt_sec); 172 bcd[PCF8563_R_MINUTE] = bintobcd(dt->dt_min); 173 bcd[PCF8563_R_HOUR] = bintobcd(dt->dt_hour); 174 bcd[PCF8563_R_DAY] = bintobcd(dt->dt_day); 175 bcd[PCF8563_R_WEEKDAY] = bintobcd(dt->dt_wday); 176 bcd[PCF8563_R_MONTH] = bintobcd(dt->dt_mon); 177 bcd[PCF8563_R_YEAR] = bintobcd(dt->dt_year % 100); 178 if (dt->dt_year < 2000) 179 bcd[PCF8563_R_MONTH] |= PCF8563_M_CENTURY; 180 181 if (iic_acquire_bus(sc->sc_tag, flags)) { 182 device_printf(sc->sc_dev, "acquire bus for write failed\n"); 183 return 0; 184 } 185 186 if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, sc->sc_addr, ®, 1, 187 &bcd[reg], PCF8563_R_YEAR - reg + 1, flags)) { 188 iic_release_bus(sc->sc_tag, flags); 189 device_printf(sc->sc_dev, "write failed\n"); 190 return 0; 191 } 192 193 iic_release_bus(sc->sc_tag, flags); 194 195 return 1; 196 } 197
Indexes created Sun Oct 26 13:09:57 GMT 2025