1 /* $NetBSD: axp22x.c,v 1.3 2017/10/07 20:31:48 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: axp22x.c,v 1.3 2017/10/07 20:31:48 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 static const char *compatible[] = { 44 "x-powers,axp221", 45 NULL 46 }; 47 48 #define AXP_TEMP_MON_REG 0x56 /* 2 bytes */ 49 50 struct axp22x_softc { 51 device_t sc_dev; 52 i2c_tag_t sc_i2c; 53 i2c_addr_t sc_addr; 54 55 struct sysmon_envsys *sc_sme; 56 envsys_data_t sc_sensor_temp; 57 }; 58 59 static int axp22x_match(device_t, cfdata_t, void *); 60 static void axp22x_attach(device_t, device_t, void *); 61 62 static void axp22x_sensors_refresh(struct sysmon_envsys *, envsys_data_t *); 63 static int axp22x_read(struct axp22x_softc *, uint8_t, uint8_t *, size_t); 64 65 CFATTACH_DECL_NEW(axp22x, sizeof(struct axp22x_softc), 66 axp22x_match, axp22x_attach, NULL, NULL); 67 68 static int 69 axp22x_match(device_t parent, cfdata_t match, void *aux) 70 { 71 struct i2c_attach_args *ia = aux; 72 73 if (ia->ia_name != NULL) 74 return iic_compat_match(ia, compatible); 75 76 return 1; 77 } 78 79 static void 80 axp22x_attach(device_t parent, device_t self, void *aux) 81 { 82 struct axp22x_softc *sc = device_private(self); 83 struct i2c_attach_args *ia = aux; 84 85 sc->sc_dev = self; 86 sc->sc_i2c = ia->ia_tag; 87 sc->sc_addr = ia->ia_addr; 88 89 aprint_naive("\n"); 90 aprint_normal("\n"); 91 92 sc->sc_sme = sysmon_envsys_create(); 93 sc->sc_sme->sme_name = device_xname(self); 94 sc->sc_sme->sme_cookie = sc; 95 sc->sc_sme->sme_refresh = axp22x_sensors_refresh; 96 97 sc->sc_sensor_temp.units = ENVSYS_STEMP; 98 sc->sc_sensor_temp.state = ENVSYS_SINVALID; 99 sc->sc_sensor_temp.flags = ENVSYS_FHAS_ENTROPY; 100 snprintf(sc->sc_sensor_temp.desc, sizeof(sc->sc_sensor_temp.desc), 101 "internal temperature"); 102 sysmon_envsys_sensor_attach(sc->sc_sme, &sc->sc_sensor_temp); 103 104 sysmon_envsys_register(sc->sc_sme); 105 } 106 107 static void 108 axp22x_sensors_refresh(struct sysmon_envsys *sme, envsys_data_t *edata) 109 { 110 struct axp22x_softc *sc = sme->sme_cookie; 111 uint8_t buf[2]; 112 int error; 113 114 iic_acquire_bus(sc->sc_i2c, 0); 115 error = axp22x_read(sc, AXP_TEMP_MON_REG, buf, sizeof(buf)); 116 iic_release_bus(sc->sc_i2c, 0); 117 118 if (error) { 119 edata->state = ENVSYS_SINVALID; 120 } else { 121 /* between -243.7C and 165.8C, step +0.1C */ 122 edata->value_cur = (((buf[0] << 4) | (buf[1] & 0xf)) - 2437) 123 * 100000 + 273150000; 124 edata->state = ENVSYS_SVALID; 125 } 126 } 127 128 static int 129 axp22x_read(struct axp22x_softc *sc, uint8_t reg, uint8_t *val, size_t len) 130 { 131 size_t i; 132 int error; 133 134 for (i = 0; i < len; i++) { 135 error = iic_smbus_read_byte(sc->sc_i2c, sc->sc_addr, 136 reg + i, &val[i], 0); 137 if (error) 138 return error; 139 } 140 141 return 0; 142 } 143