1 /* $NetBSD: axp22x.c,v 1.9 2021/01/27 02:29:48 thorpej 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 1.9 2021/01/27 02:29:48 thorpej 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 struct device_compatible_entry compat_data[] = { 44 { .compat = "x-powers,axp221" }, 45 DEVICE_COMPAT_EOL 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 int match_result; 73 74 if (iic_use_direct_match(ia, match, compat_data, &match_result)) 75 return match_result; 76 77 /* This device is direct-config only. */ 78 79 return 0; 80 } 81 82 static void 83 axp22x_attach(device_t parent, device_t self, void *aux) 84 { 85 struct axp22x_softc *sc = device_private(self); 86 struct i2c_attach_args *ia = aux; 87 88 sc->sc_dev = self; 89 sc->sc_i2c = ia->ia_tag; 90 sc->sc_addr = ia->ia_addr; 91 92 aprint_naive("\n"); 93 aprint_normal("\n"); 94 95 sc->sc_sme = sysmon_envsys_create(); 96 sc->sc_sme->sme_name = device_xname(self); 97 sc->sc_sme->sme_cookie = sc; 98 sc->sc_sme->sme_refresh = axp22x_sensors_refresh; 99 100 sc->sc_sensor_temp.units = ENVSYS_STEMP; 101 sc->sc_sensor_temp.state = ENVSYS_SINVALID; 102 sc->sc_sensor_temp.flags = ENVSYS_FHAS_ENTROPY; 103 snprintf(sc->sc_sensor_temp.desc, sizeof(sc->sc_sensor_temp.desc), 104 "internal temperature"); 105 sysmon_envsys_sensor_attach(sc->sc_sme, &sc->sc_sensor_temp); 106 107 sysmon_envsys_register(sc->sc_sme); 108 } 109 110 static void 111 axp22x_sensors_refresh(struct sysmon_envsys *sme, envsys_data_t *edata) 112 { 113 struct axp22x_softc *sc = sme->sme_cookie; 114 uint8_t buf[2]; 115 int error; 116 117 iic_acquire_bus(sc->sc_i2c, 0); 118 error = axp22x_read(sc, AXP_TEMP_MON_REG, buf, sizeof(buf)); 119 iic_release_bus(sc->sc_i2c, 0); 120 121 if (error) { 122 edata->state = ENVSYS_SINVALID; 123 } else { 124 /* between -243.7C and 165.8C, step +0.1C */ 125 edata->value_cur = (((buf[0] << 4) | (buf[1] & 0xf)) - 2437) 126 * 100000 + 273150000; 127 edata->state = ENVSYS_SVALID; 128 } 129 } 130 131 static int 132 axp22x_read(struct axp22x_softc *sc, uint8_t reg, uint8_t *val, size_t len) 133 { 134 size_t i; 135 int error; 136 137 for (i = 0; i < len; i++) { 138 error = iic_smbus_read_byte(sc->sc_i2c, sc->sc_addr, 139 reg + i, &val[i], 0); 140 if (error) 141 return error; 142 } 143 144 return 0; 145 } 146