tmp121.c revision 1.12
1 /* $NetBSD: tmp121.c,v 1.12 2025/09/13 14:10:44 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 2006 Urbana-Champaign Independent Media Center. 5 * Copyright (c) 2006 Garrett D'Amore. 6 * All rights reserved. 7 * 8 * Portions of this code were written by Garrett D'Amore for the 9 * Champaign-Urbana Community Wireless Network Project. 10 * 11 * Redistribution and use in source and binary forms, with or 12 * without modification, are permitted provided that the following 13 * conditions are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above 17 * copyright notice, this list of conditions and the following 18 * disclaimer in the documentation and/or other materials provided 19 * with the distribution. 20 * 3. All advertising materials mentioning features or use of this 21 * software must display the following acknowledgements: 22 * This product includes software developed by the Urbana-Champaign 23 * Independent Media Center. 24 * This product includes software developed by Garrett D'Amore. 25 * 4. Urbana-Champaign Independent Media Center's name and Garrett 26 * D'Amore's name may not be used to endorse or promote products 27 * derived from this software without specific prior written permission. 28 * 29 * THIS SOFTWARE IS PROVIDED BY THE URBANA-CHAMPAIGN INDEPENDENT 30 * MEDIA CENTER AND GARRETT D'AMORE ``AS IS'' AND ANY EXPRESS OR 31 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 32 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 33 * ARE DISCLAIMED. IN NO EVENT SHALL THE URBANA-CHAMPAIGN INDEPENDENT 34 * MEDIA CENTER OR GARRETT D'AMORE BE LIABLE FOR ANY DIRECT, INDIRECT, 35 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 36 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 37 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 38 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 39 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 40 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 41 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 42 */ 43 44 #include <sys/cdefs.h> 45 __KERNEL_RCSID(0, "$NetBSD: tmp121.c,v 1.12 2025/09/13 14:10:44 thorpej Exp $"); 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/device.h> 50 #include <sys/kernel.h> 51 52 #include <dev/sysmon/sysmonvar.h> 53 54 #include <dev/spi/spivar.h> 55 56 struct tmp121temp_softc { 57 spi_handle_t sc_sh; 58 59 struct sysmon_envsys *sc_sme; 60 envsys_data_t sc_sensor; 61 }; 62 63 static int tmp121temp_match(device_t, cfdata_t, void *); 64 static void tmp121temp_attach(device_t, device_t, void *); 65 66 static void tmp121temp_refresh(struct sysmon_envsys *, envsys_data_t *); 67 68 CFATTACH_DECL_NEW(tmp121temp, sizeof(struct tmp121temp_softc), 69 tmp121temp_match, tmp121temp_attach, NULL, NULL); 70 71 static const struct device_compatible_entry compat_data[] = { 72 { .compat = "ti,tmp121" }, 73 { .compat = "TMP00121" }, 74 75 #if 0 /* We should also add support for these: */ 76 { .compat = "ti,tmp122" }, 77 78 { .compat = "ti,lm70" }, 79 { .compat = "LM000070" }, 80 81 { .compat = "ti,lm71" }, 82 { .compat = "LM000071" }, 83 84 { .compat = "ti,lm74" }, 85 { .compat = "LM000074" }, 86 #endif 87 DEVICE_COMPAT_EOL 88 }; 89 90 static int 91 tmp121temp_match(device_t parent, cfdata_t cf, void *aux) 92 { 93 struct spi_attach_args *sa = aux; 94 int match_result; 95 96 if (spi_use_direct_match(sa, compat_data, &match_result)) { 97 return match_result; 98 } 99 100 return SPI_MATCH_DEFAULT; 101 } 102 103 static void 104 tmp121temp_attach(device_t parent, device_t self, void *aux) 105 { 106 struct tmp121temp_softc *sc = device_private(self); 107 struct spi_attach_args *sa = aux; 108 int error; 109 110 aprint_naive(": Temperature Sensor\n"); 111 aprint_normal(": TI TMP121 Temperature Sensor\n"); 112 113 /* configure for 10MHz */ 114 error = spi_configure(self, sa->sa_handle, SPI_MODE_0, 115 SPI_FREQ_MHz(10)); 116 if (error) { 117 return; 118 } 119 120 sc->sc_sh = sa->sa_handle; 121 122 sc->sc_sme = sysmon_envsys_create(); 123 sc->sc_sensor.units = ENVSYS_STEMP; 124 sc->sc_sensor.state = ENVSYS_SINVALID; 125 strlcpy(sc->sc_sensor.desc, device_xname(self), 126 sizeof(sc->sc_sensor.desc)); 127 if (sysmon_envsys_sensor_attach(sc->sc_sme, &sc->sc_sensor)) { 128 sysmon_envsys_destroy(sc->sc_sme); 129 return; 130 } 131 132 sc->sc_sme->sme_name = device_xname(self); 133 sc->sc_sme->sme_refresh = tmp121temp_refresh; 134 sc->sc_sme->sme_cookie = sc; 135 136 if (sysmon_envsys_register(sc->sc_sme)) { 137 aprint_error_dev(self, "unable to register with sysmon\n"); 138 sysmon_envsys_destroy(sc->sc_sme); 139 } 140 } 141 142 static void 143 tmp121temp_refresh(struct sysmon_envsys *sme, envsys_data_t *edata) 144 { 145 struct tmp121temp_softc *sc = sme->sme_cookie; 146 uint16_t reg; 147 int16_t sreg; 148 int val; 149 150 if (spi_recv(sc->sc_sh, 2, (uint8_t *)®) != 0) { 151 edata->state = ENVSYS_SINVALID; 152 return; 153 } 154 155 sreg = (int16_t)be16toh(reg); 156 157 /* 158 * convert to uK: 159 * 160 * TMP121 bits: 161 * D15 : sign bit 162 * D14-D3 : data (D14 is MSB) 163 * D2-D0 : zero 164 * 165 * The data is represented in units of 0.0625 deg C. 166 */ 167 sreg >>= 3; 168 val = sreg * 62500 + 273150000; 169 170 edata->value_cur = val; 171 edata->state = ENVSYS_SVALID; 172 } 173
Indexes created Mon Sep 22 10:09:38 GMT 2025