pcf8563.c revision 1.4
1 /* $NetBSD: pcf8563.c,v 1.4 2014/11/20 16:34:26 christos 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 2014/11/20 16:34:26 christos 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 todr_attach(&sc->sc_todr); 95 } 96 97 static int 98 pcf8563rtc_gettime(struct todr_chip_handle *ch, struct clock_ymdhms *dt) 99 { 100 struct pcf8563rtc_softc *sc = ch->cookie; 101 102 if (pcf8563rtc_clock_read(sc, dt) == 0) 103 return -1; 104 105 return 0; 106 } 107 108 static int 109 pcf8563rtc_settime(struct todr_chip_handle *ch, struct clock_ymdhms *dt) 110 { 111 struct pcf8563rtc_softc *sc = ch->cookie; 112 113 if (pcf8563rtc_clock_write(sc, dt) == 0) 114 return -1; 115 116 return 0; 117 } 118 119 static int 120 pcf8563rtc_clock_read(struct pcf8563rtc_softc *sc, struct clock_ymdhms *dt) 121 { 122 uint8_t bcd[PCF8563_NREGS]; 123 uint8_t reg = PCF8563_R_CS1; 124 125 if (iic_acquire_bus(sc->sc_tag, I2C_F_POLL)) { 126 device_printf(sc->sc_dev, "acquire bus for read failed\n"); 127 return 0; 128 } 129 130 if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP, sc->sc_addr, ®, 1, 131 &bcd[reg], PCF8563_R_YEAR - reg + 1, I2C_F_POLL)) { 132 iic_release_bus(sc->sc_tag, I2C_F_POLL); 133 device_printf(sc->sc_dev, "read failed\n"); 134 return 0; 135 } 136 137 iic_release_bus(sc->sc_tag, I2C_F_POLL); 138 139 dt->dt_sec = bcdtobin(bcd[PCF8563_R_SECOND] & PCF8563_M_SECOND); 140 dt->dt_min = bcdtobin(bcd[PCF8563_R_MINUTE] & PCF8563_M_MINUTE); 141 dt->dt_hour = bcdtobin(bcd[PCF8563_R_HOUR] & PCF8563_M_HOUR); 142 dt->dt_day = bcdtobin(bcd[PCF8563_R_DAY] & PCF8563_M_DAY); 143 dt->dt_mon = bcdtobin(bcd[PCF8563_R_MONTH] & PCF8563_M_MONTH); 144 dt->dt_year = bcdtobin(bcd[PCF8563_R_YEAR] & PCF8563_M_YEAR); 145 dt->dt_year += 2000; 146 147 return 1; 148 } 149 150 static int 151 pcf8563rtc_clock_write(struct pcf8563rtc_softc *sc, struct clock_ymdhms *dt) 152 { 153 uint8_t bcd[PCF8563_NREGS]; 154 uint8_t reg = PCF8563_R_SECOND; 155 156 bcd[PCF8563_R_SECOND] = bintobcd(dt->dt_sec); 157 bcd[PCF8563_R_MINUTE] = bintobcd(dt->dt_min); 158 bcd[PCF8563_R_HOUR] = bintobcd(dt->dt_hour); 159 bcd[PCF8563_R_DAY] = bintobcd(dt->dt_day); 160 bcd[PCF8563_R_WEEKDAY] = bintobcd(dt->dt_wday); 161 bcd[PCF8563_R_MONTH] = bintobcd(dt->dt_mon); 162 bcd[PCF8563_R_YEAR] = bintobcd(dt->dt_year % 100); 163 164 if (iic_acquire_bus(sc->sc_tag, I2C_F_POLL)) { 165 device_printf(sc->sc_dev, "acquire bus for write failed\n"); 166 return 0; 167 } 168 169 if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP, sc->sc_addr, ®, 1, 170 &bcd[reg], PCF8563_R_YEAR - reg + 1, I2C_F_POLL)) { 171 iic_release_bus(sc->sc_tag, I2C_F_POLL); 172 device_printf(sc->sc_dev, "write failed\n"); 173 return 0; 174 } 175 176 iic_release_bus(sc->sc_tag, I2C_F_POLL); 177 178 return 1; 179 } 180
Indexes created Tue Sep 30 11:09:46 GMT 2025