dstemp.c revision 1.5
1 /* $NetBSD: dstemp.c,v 1.5 2020/02/28 13:18:25 macallan Exp $ */ 2 3 /*- 4 * Copyright (c) 2018 Michael Lorenz 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 NETBSD FOUNDATION, INC. 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 FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __KERNEL_RCSID(0, "$NetBSD: dstemp.c,v 1.5 2020/02/28 13:18:25 macallan Exp $"); 31 32 #include <sys/param.h> 33 #include <sys/systm.h> 34 #include <sys/device.h> 35 #include <sys/conf.h> 36 #include <sys/bus.h> 37 38 #include <dev/i2c/i2cvar.h> 39 40 #include <dev/sysmon/sysmonvar.h> 41 42 #ifdef macppc 43 #define HAVE_OF 1 44 #endif 45 46 #ifdef HAVE_OF 47 #include <dev/ofw/openfirm.h> 48 #endif 49 50 #define DSTEMP_CMD_START 0x51 /* command, no data */ 51 #define DSTEMP_CMD_POR 0x54 /* command, no data */ 52 #define DSTEMP_CMD_STOP 0x22 /* command, no data */ 53 #define DSTEMP_TCURRENT 0xaa /* current temperature, 2 bytes */ 54 #define DSTEMP_THIGH 0xa1 /* high threshold, 2 bytes */ 55 #define DSTEMP_TLOW 0xa2 /* low threshold, 2 bytes */ 56 #define DSTEMP_CONFIG 0xac /* 1 byte */ 57 58 #define DSTEMP_1SHOT 0x01 59 #define DSTEMP_POL 0x02 /* Tout polarity, 1 - active high */ 60 #define DSTEMP_8BIT 0x00 61 #define DSTEMP_10BIT 0x04 62 #define DSTEMP_11BIT 0x08 63 #define DSTEMP_12BIT 0x0c 64 #define DSTEMP_RES_MASK 0x0c 65 #define DSTEMP_NVB 0x10 /* EEPROM busy */ 66 #define DSTEMP_TLF 0x20 /* temperature low flag */ 67 #define DSTEMP_THF 0x40 /* temperature high flag */ 68 #define DSTEMP_DONE 0x80 69 70 struct dstemp_softc { 71 device_t sc_dev; 72 i2c_tag_t sc_i2c; 73 i2c_addr_t sc_addr; 74 75 struct sysmon_envsys *sc_sme; 76 envsys_data_t sc_sensor_temp; 77 }; 78 79 static int dstemp_match(device_t, cfdata_t, void *); 80 static void dstemp_attach(device_t, device_t, void *); 81 82 static void dstemp_sensors_refresh(struct sysmon_envsys *, envsys_data_t *); 83 static void dstemp_init(struct dstemp_softc *); 84 85 CFATTACH_DECL_NEW(dstemp, sizeof(struct dstemp_softc), 86 dstemp_match, dstemp_attach, NULL, NULL); 87 88 static const struct device_compatible_entry compat_data[] = { 89 { "ds1631", 0 }, 90 { NULL, 0 } 91 }; 92 93 static int 94 dstemp_match(device_t parent, cfdata_t match, void *aux) 95 { 96 struct i2c_attach_args *ia = aux; 97 int match_result; 98 99 if (iic_use_direct_match(ia, match, compat_data, &match_result)) 100 return match_result; 101 102 if ((ia->ia_addr & 0xf8) == 0x48) 103 return I2C_MATCH_ADDRESS_ONLY; 104 105 return 0; 106 } 107 108 static void 109 dstemp_attach(device_t parent, device_t self, void *aux) 110 { 111 struct dstemp_softc *sc = device_private(self); 112 struct i2c_attach_args *ia = aux; 113 char name[64] = "temperature"; 114 115 sc->sc_dev = self; 116 sc->sc_i2c = ia->ia_tag; 117 sc->sc_addr = ia->ia_addr; 118 119 aprint_naive("\n"); 120 aprint_normal(": DS1361\n"); 121 122 dstemp_init(sc); 123 124 sc->sc_sme = sysmon_envsys_create(); 125 sc->sc_sme->sme_name = device_xname(self); 126 sc->sc_sme->sme_cookie = sc; 127 sc->sc_sme->sme_refresh = dstemp_sensors_refresh; 128 129 sc->sc_sensor_temp.units = ENVSYS_STEMP; 130 sc->sc_sensor_temp.state = ENVSYS_SINVALID; 131 #ifdef HAVE_OF 132 int ch; 133 ch = OF_child(ia->ia_cookie); 134 if (ch != 0) { 135 OF_getprop(ch, "location", name, 64); 136 } 137 #endif 138 strncpy(sc->sc_sensor_temp.desc, name, sizeof(sc->sc_sensor_temp.desc)); 139 140 sysmon_envsys_sensor_attach(sc->sc_sme, &sc->sc_sensor_temp); 141 142 sysmon_envsys_register(sc->sc_sme); 143 } 144 145 static void 146 dstemp_init(struct dstemp_softc *sc) 147 { 148 int error; 149 uint8_t cmd[2], data; 150 151 iic_acquire_bus(sc->sc_i2c, 0); 152 cmd[0] = DSTEMP_CONFIG; 153 data = 0; 154 error = iic_exec(sc->sc_i2c, I2C_OP_READ_WITH_STOP, 155 sc->sc_addr, cmd, 1, &data, 1, 0); 156 /* we don't want to change the POL bit, so preserve it */ 157 cmd[1] = (data & DSTEMP_POL) | DSTEMP_12BIT; 158 error |= iic_exec(sc->sc_i2c, I2C_OP_WRITE_WITH_STOP, 159 sc->sc_addr, cmd, 2, NULL, 0, 0); 160 /* ... and start converting */ 161 cmd[0] = DSTEMP_CMD_START; 162 error |= iic_exec(sc->sc_i2c, I2C_OP_WRITE_WITH_STOP, 163 sc->sc_addr, cmd, 1, NULL, 0, 0); 164 if (error) aprint_error_dev(sc->sc_dev, "chip initialization failed\n"); 165 iic_release_bus(sc->sc_i2c, 0); 166 } 167 168 static void 169 dstemp_sensors_refresh(struct sysmon_envsys *sme, envsys_data_t *edata) 170 { 171 struct dstemp_softc *sc = sme->sme_cookie; 172 uint8_t cmd = DSTEMP_TCURRENT; 173 uint16_t data = 0; 174 int error; 175 176 177 iic_acquire_bus(sc->sc_i2c, 0); 178 error = iic_exec(sc->sc_i2c, I2C_OP_READ_WITH_STOP, 179 sc->sc_addr, &cmd, 1, &data, 2, 0); 180 iic_release_bus(sc->sc_i2c, 0); 181 182 if (error) { 183 edata->state = ENVSYS_SINVALID; 184 } else { 185 edata->value_cur = 186 ((uint64_t)(be16toh(data) >> 4) * 62500) + 187 + 273150000; 188 if (edata->value_cur > (273150000 + 120000000)) { 189 edata->state = ENVSYS_SINVALID; 190 } else 191 edata->state = ENVSYS_SVALID; 192 } 193 } 194
Indexes created Fri Sep 26 20:09:58 GMT 2025