1 /* $NetBSD: axp20x.c,v 1.2 2014/09/09 23:39:16 jmcneill Exp $ */ 2 3 /*- 4 * Copyright (c) 2014 Jared D. McNeill <jmcneill@invisible.ca> 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: axp20x.c,v 1.2 2014/09/09 23:39:16 jmcneill 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 #include <sys/kmem.h> 38 39 #include <dev/i2c/i2cvar.h> 40 41 #include <dev/sysmon/sysmonvar.h> 42 43 #define AXP_TEMP_MON_REG 0x5e /* 2 bytes */ 44 45 struct axp20x_softc { 46 device_t sc_dev; 47 i2c_tag_t sc_i2c; 48 i2c_addr_t sc_addr; 49 50 struct sysmon_envsys *sc_sme; 51 envsys_data_t sc_sensor_temp; 52 }; 53 54 static int axp20x_match(device_t, cfdata_t, void *); 55 static void axp20x_attach(device_t, device_t, void *); 56 57 static void axp20x_sensors_refresh(struct sysmon_envsys *, envsys_data_t *); 58 static int axp20x_read(struct axp20x_softc *, uint8_t, uint8_t *, size_t); 59 60 CFATTACH_DECL_NEW(axp20x, sizeof(struct axp20x_softc), 61 axp20x_match, axp20x_attach, NULL, NULL); 62 63 static int 64 axp20x_match(device_t parent, cfdata_t match, void *aux) 65 { 66 return 1; 67 } 68 69 static void 70 axp20x_attach(device_t parent, device_t self, void *aux) 71 { 72 struct axp20x_softc *sc = device_private(self); 73 struct i2c_attach_args *ia = aux; 74 75 sc->sc_dev = self; 76 sc->sc_i2c = ia->ia_tag; 77 sc->sc_addr = ia->ia_addr; 78 79 aprint_naive("\n"); 80 aprint_normal("\n"); 81 82 sc->sc_sme = sysmon_envsys_create(); 83 sc->sc_sme->sme_name = device_xname(self); 84 sc->sc_sme->sme_cookie = sc; 85 sc->sc_sme->sme_refresh = axp20x_sensors_refresh; 86 87 sc->sc_sensor_temp.units = ENVSYS_STEMP; 88 sc->sc_sensor_temp.state = ENVSYS_SINVALID; 89 sc->sc_sensor_temp.flags = ENVSYS_FHAS_ENTROPY; 90 snprintf(sc->sc_sensor_temp.desc, sizeof(sc->sc_sensor_temp.desc), 91 "internal temperature"); 92 sysmon_envsys_sensor_attach(sc->sc_sme, &sc->sc_sensor_temp); 93 94 sysmon_envsys_register(sc->sc_sme); 95 } 96 97 static void 98 axp20x_sensors_refresh(struct sysmon_envsys *sme, envsys_data_t *edata) 99 { 100 struct axp20x_softc *sc = sme->sme_cookie; 101 uint8_t buf[2]; 102 int error; 103 104 iic_acquire_bus(sc->sc_i2c, 0); 105 error = axp20x_read(sc, AXP_TEMP_MON_REG, buf, sizeof(buf)); 106 iic_release_bus(sc->sc_i2c, 0); 107 108 if (error) { 109 edata->state = ENVSYS_SINVALID; 110 } else { 111 /* between -144.7C and 264.8C, step +0.1C */ 112 edata->value_cur = (((buf[0] << 4) | (buf[1] & 0xf)) - 1447) 113 * 100000 + 273150000; 114 edata->state = ENVSYS_SVALID; 115 } 116 } 117 118 static int 119 axp20x_read(struct axp20x_softc *sc, uint8_t reg, uint8_t *val, size_t len) 120 { 121 return iic_smbus_block_read(sc->sc_i2c, sc->sc_addr, 122 reg, val, len, 0); 123 } 124