1 /* $NetBSD: asms.c,v 1.4 2021/01/27 02:29:48 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 2020 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: asms.c,v 1.4 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 38 #include <dev/i2c/i2cvar.h> 39 40 #include <dev/sysmon/sysmonvar.h> 41 42 struct asms_softc { 43 device_t sc_dev; 44 i2c_tag_t sc_i2c; 45 i2c_addr_t sc_addr; 46 47 struct sysmon_envsys *sc_sme; 48 envsys_data_t sc_sensors[3]; 49 }; 50 51 static int asms_match(device_t, cfdata_t, void *); 52 static void asms_attach(device_t, device_t, void *); 53 54 static void asms_sensors_refresh(struct sysmon_envsys *, envsys_data_t *); 55 static void asms_init(struct asms_softc *); 56 57 CFATTACH_DECL_NEW(asms, sizeof(struct asms_softc), 58 asms_match, asms_attach, NULL, NULL); 59 60 static const struct device_compatible_entry compat_data[] = { 61 { .compat = "accelerometer" }, 62 { .compat = "AAPL,accelerometer_1" }, 63 DEVICE_COMPAT_EOL 64 }; 65 66 /* ASMS Registers, from OpenBSD */ 67 #define ASMS_REG_COMMAND 0x00 68 #define ASMS_REG_STATUS 0x01 69 #define ASMS_REG_RCONTROL1 0x02 70 #define ASMS_REG_RCONTROL2 0x03 71 #define ASMS_REG_RCONTROL3 0x04 72 #define ASMS_REG_RDATA1 0x05 73 #define ASMS_REG_RDATA2 0x06 74 #define ASMS_REG_DATA_X 0x20 75 #define ASMS_REG_DATA_Y 0x21 76 #define ASMS_REG_DATA_Z 0x22 77 #define ASMS_REG_SENS_LOW 0x26 /* init with 0x15 */ 78 #define ASMS_REG_SENS_HIGH 0x27 /* init with 0x60 */ 79 #define ASMS_REG_CONTROL_X 0x28 /* init with 0x08 */ 80 #define ASMS_REG_CONTROL_Y 0x29 /* init with 0x0f */ 81 #define ASMS_REG_CONTROL_Z 0x2a /* init with 0x4f */ 82 #define ASMS_REG_UNKNOWN1 0x2b /* init with 0x14 */ 83 #define ASMS_REG_VENDOR 0x2e 84 #define ASMS_CMD_READ_VER 0x01 85 #define ASMS_CMD_READ_MEM 0x02 86 #define ASMS_CMD_RESET 0x07 87 #define ASMS_CMD_START 0x08 88 89 static int 90 asms_match(device_t parent, cfdata_t match, void *aux) 91 { 92 struct i2c_attach_args *ia = aux; 93 int match_result; 94 95 if (iic_use_direct_match(ia, match, compat_data, &match_result)) 96 return match_result; 97 98 if ((ia->ia_addr & 0xf8) == 0xd8) 99 return I2C_MATCH_ADDRESS_ONLY; 100 101 return 0; 102 } 103 104 static void 105 asms_attach(device_t parent, device_t self, void *aux) 106 { 107 struct asms_softc *sc = device_private(self); 108 struct i2c_attach_args *ia = aux; 109 envsys_data_t *s; 110 111 sc->sc_dev = self; 112 sc->sc_i2c = ia->ia_tag; 113 sc->sc_addr = ia->ia_addr; 114 115 aprint_naive("\n"); 116 aprint_normal(": Sudden Motion Sensor\n"); 117 118 asms_init(sc); 119 120 sc->sc_sme = sysmon_envsys_create(); 121 sc->sc_sme->sme_name = device_xname(self); 122 sc->sc_sme->sme_cookie = sc; 123 sc->sc_sme->sme_refresh = asms_sensors_refresh; 124 125 s = &sc->sc_sensors[0]; 126 s->units = ENVSYS_INTEGER; 127 s->state = ENVSYS_SINVALID; 128 s->private = ASMS_REG_DATA_X; 129 strncpy(s->desc, "X", sizeof(s->desc)); 130 sysmon_envsys_sensor_attach(sc->sc_sme, s); 131 132 s = &sc->sc_sensors[1]; 133 s->units = ENVSYS_INTEGER; 134 s->state = ENVSYS_SINVALID; 135 s->private = ASMS_REG_DATA_Y; 136 strncpy(s->desc, "Y", sizeof(s->desc)); 137 sysmon_envsys_sensor_attach(sc->sc_sme, s); 138 139 s = &sc->sc_sensors[2]; 140 s->units = ENVSYS_INTEGER; 141 s->state = ENVSYS_SINVALID; 142 s->private = ASMS_REG_DATA_Z; 143 strncpy(s->desc, "Z", sizeof(s->desc)); 144 sysmon_envsys_sensor_attach(sc->sc_sme, s); 145 146 sysmon_envsys_register(sc->sc_sme); 147 } 148 149 static void 150 asms_init(struct asms_softc *sc) 151 { 152 int error, i, j; 153 uint8_t cmd[2], data[48]; 154 155 iic_acquire_bus(sc->sc_i2c, 0); 156 157 cmd[0] = ASMS_REG_COMMAND; 158 data[0] = ASMS_CMD_START; 159 error = iic_exec(sc->sc_i2c, I2C_OP_WRITE_WITH_STOP, 160 sc->sc_addr, cmd, 1, data, 1, 0); 161 delay(10000); 162 163 cmd[0] = 0; 164 error = iic_exec(sc->sc_i2c, I2C_OP_READ_WITH_STOP, 165 sc->sc_addr, cmd, 1, data, 48, 0); 166 iic_release_bus(sc->sc_i2c, 0); 167 if (error != 0) { 168 aprint_error_dev(sc->sc_dev, "unable to read registers.\n"); 169 return; 170 } 171 for (i = 0; i < 48; i += 8) { 172 printf("%02x:", i); 173 for (j =0; j < 8; j++) { 174 printf(" %02x", data[i + j]); 175 } 176 printf("\n"); 177 } 178 } 179 180 static void 181 asms_sensors_refresh(struct sysmon_envsys *sme, envsys_data_t *edata) 182 { 183 struct asms_softc *sc = sme->sme_cookie; 184 uint8_t cmd = 0; 185 int8_t data = 0; 186 int error; 187 188 cmd = edata->private; 189 iic_acquire_bus(sc->sc_i2c, 0); 190 error = iic_exec(sc->sc_i2c, I2C_OP_READ_WITH_STOP, 191 sc->sc_addr, &cmd, 1, &data, 1, 0); 192 iic_release_bus(sc->sc_i2c, 0); 193 194 if (error) { 195 edata->state = ENVSYS_SINVALID; 196 } else { 197 edata->value_cur = (int)data; 198 edata->state = ENVSYS_SVALID; 199 } 200 } 201
Indexes created Sun Oct 25 00:26:45 UTC 2026