Annotation of sys/dev/i2c/tsl2560.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: tsl2560.c,v 1.6 2007/06/24 05:34:35 dlg Exp $ */
! 2:
! 3: /*
! 4: * Copyright (c) 2005 Mark Kettenis
! 5: *
! 6: * Permission to use, copy, modify, and distribute this software for any
! 7: * purpose with or without fee is hereby granted, provided that the above
! 8: * copyright notice and this permission notice appear in all copies.
! 9: *
! 10: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
! 11: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
! 12: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
! 13: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
! 14: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
! 15: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
! 16: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
! 17: */
! 18:
! 19: #include <sys/param.h>
! 20: #include <sys/systm.h>
! 21: #include <sys/device.h>
! 22: #include <sys/sensors.h>
! 23:
! 24: #include <dev/i2c/i2cvar.h>
! 25:
! 26: /* TSL2560/61 registers */
! 27: #define TSL2560_REG_CONTROL 0x80
! 28: #define TSL2560_CONTROL_POWER 0x03
! 29: #define TSL2560_REG_TIMING 0x81
! 30: #define TSL2560_TIMING_GAIN 0x10 /* high gain (16x) */
! 31: #define TSL2560_TIMING_INTEG0 0x00 /* 13.7ms */
! 32: #define TSL2560_TIMING_INTEG1 0x01 /* 101ms */
! 33: #define TSL2560_TIMING_INTEG2 0x02 /* 402ms */
! 34: #define TSL2560_REG_ID 0x8a
! 35: #define TSL2560_REG_DATA0 0xac
! 36: #define TSL2560_REG_DATA1 0xae
! 37:
! 38: struct tsl_softc {
! 39: struct device sc_dev;
! 40: i2c_tag_t sc_tag;
! 41: i2c_addr_t sc_addr;
! 42:
! 43: struct ksensor sc_sensor;
! 44: struct ksensordev sc_sensordev;
! 45: };
! 46:
! 47: int tsl_match(struct device *, void *, void *);
! 48: void tsl_attach(struct device *, struct device *, void *);
! 49:
! 50: void tsl_refresh(void *);
! 51: u_int64_t tsl_lux(u_int32_t, u_int32_t);
! 52:
! 53: struct cfattach tsl_ca = {
! 54: sizeof(struct tsl_softc), tsl_match, tsl_attach
! 55: };
! 56:
! 57: struct cfdriver tsl_cd = {
! 58: NULL, "tsl", DV_DULL
! 59: };
! 60:
! 61: int
! 62: tsl_match(struct device *parent, void *match, void *aux)
! 63: {
! 64: struct i2c_attach_args *ia = aux;
! 65:
! 66: if (strcmp(ia->ia_name, "tsl2560") == 0)
! 67: return (1);
! 68: return (0);
! 69: }
! 70:
! 71: void
! 72: tsl_attach(struct device *parent, struct device *self, void *aux)
! 73: {
! 74: struct tsl_softc *sc = (struct tsl_softc *)self;
! 75: struct i2c_attach_args *ia = aux;
! 76: u_int8_t cmd, data;
! 77:
! 78: sc->sc_tag = ia->ia_tag;
! 79: sc->sc_addr = ia->ia_addr;
! 80:
! 81: iic_acquire_bus(sc->sc_tag, 0);
! 82: cmd = TSL2560_REG_CONTROL; data = TSL2560_CONTROL_POWER;
! 83: if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP,
! 84: sc->sc_addr, &cmd, 1, &data, 1, 0)) {
! 85: iic_release_bus(sc->sc_tag, 0);
! 86: printf(": power up failed\n");
! 87: return;
! 88: }
! 89: cmd = TSL2560_REG_TIMING;
! 90: data = TSL2560_TIMING_GAIN | TSL2560_TIMING_INTEG2;
! 91: if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP,
! 92: sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0)) {
! 93: iic_release_bus(sc->sc_tag, 0);
! 94: printf(": cannot write timing register\n");
! 95: return;
! 96: }
! 97: cmd = TSL2560_REG_ID;
! 98: if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
! 99: sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0)) {
! 100: iic_release_bus(sc->sc_tag, 0);
! 101: printf(": cannot read ID register\n");
! 102: return;
! 103: }
! 104: iic_release_bus(sc->sc_tag, 0);
! 105:
! 106: switch (data >> 4) {
! 107: case 0:
! 108: printf(": TSL2560 rev %x", data & 0x0f);
! 109: break;
! 110: case 1:
! 111: printf(": TSL2561 rev %x", data & 0x0f);
! 112: break;
! 113: default:
! 114: printf(": unknown part number %x", data >> 4);
! 115: break;
! 116: }
! 117:
! 118: /* Initialize sensor data. */
! 119: strlcpy(sc->sc_sensordev.xname, sc->sc_dev.dv_xname,
! 120: sizeof(sc->sc_sensordev.xname));
! 121: sc->sc_sensor.type = SENSOR_LUX;
! 122:
! 123: if (sensor_task_register(sc, tsl_refresh, 5) == NULL) {
! 124: printf(": unable to register update task\n");
! 125: return;
! 126: }
! 127:
! 128: sensor_attach(&sc->sc_sensordev, &sc->sc_sensor);
! 129: sensordev_install(&sc->sc_sensordev);
! 130:
! 131: printf("\n");
! 132: }
! 133:
! 134: void
! 135: tsl_refresh(void *arg)
! 136: {
! 137: struct tsl_softc *sc = arg;
! 138: u_int8_t cmd, data[2];
! 139: u_int16_t chan0, chan1;
! 140:
! 141: iic_acquire_bus(sc->sc_tag, 0);
! 142: cmd = TSL2560_REG_DATA0;
! 143: if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
! 144: sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0)) {
! 145: iic_release_bus(sc->sc_tag, 0);
! 146: sc->sc_sensor.flags |= SENSOR_FINVALID;
! 147: return;
! 148: }
! 149: chan0 = data[1] << 8 | data[0];
! 150: cmd = TSL2560_REG_DATA1;
! 151: if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
! 152: sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0)) {
! 153: iic_release_bus(sc->sc_tag, 0);
! 154: sc->sc_sensor.flags |= SENSOR_FINVALID;
! 155: return;
! 156: }
! 157: chan1 = data[1] << 8 | data[0];
! 158: iic_release_bus(sc->sc_tag, 0);
! 159:
! 160: sc->sc_sensor.value = tsl_lux(chan0, chan1);
! 161: sc->sc_sensor.flags &= ~SENSOR_FINVALID;
! 162: }
! 163:
! 164: /* Precision for fixed-point math. */
! 165: #define TSL2560_RATIO_SCALE 9
! 166: #define TSL2560_LUX_SCALE 14
! 167:
! 168: /*
! 169: * The TSL2560/2561 comes in a ChipScale or TMB-6 package and the
! 170: * calibration is slightly different for each package. The constants
! 171: * below are for the TMB-6 package.
! 172: */
! 173:
! 174: #define TSL2560_K1T 0x0040 /* 0.125 * (1 << TSL2560_RATIO_SCALE) */
! 175: #define TSL2560_B1T 0x01f2 /* 0.0304 * (1 << TSL2560_LUX_SCALE) */
! 176: #define TSL2560_M1T 0x01be /* 0.0272 * (1 << TSL2560_LUX_SCALE) */
! 177:
! 178: #define TSL2560_K2T 0x0080 /* 0.250 * (1 << TSL2560_RATIO_SCALE) */
! 179: #define TSL2560_B2T 0x0214 /* 0.0324 * (1 << TSL2560_LUX_SCALE) */
! 180: #define TSL2560_M2T 0x02d1 /* 0.0440 * (1 << TSL2560_LUX_SCALE) */
! 181:
! 182: #define TSL2560_K3T 0x00c0 /* 0.375 * (1 << TSL2560_RATIO_SCALE) */
! 183: #define TSL2560_B3T 0x023f /* 0.0351 * (1 << TSL2560_LUX_SCALE) */
! 184: #define TSL2560_M3T 0x037b /* 0.0544 * (1 << TSL2560_LUX_SCALE) */
! 185:
! 186: #define TSL2560_K4T 0x0080 /* 0.50 * (1 << TSL2560_RATIO_SCALE) */
! 187: #define TSL2560_B4T 0x0214 /* 0.0381 * (1 << TSL2560_LUX_SCALE) */
! 188: #define TSL2560_M4T 0x02d1 /* 0.0624 * (1 << TSL2560_LUX_SCALE) */
! 189:
! 190: #define TSL2560_K5T 0x0138 /* 0.61 * (1 << TSL2560_RATIO_SCALE) */
! 191: #define TSL2560_B5T 0x016f /* 0.0224 * (1 << TSL2560_LUX_SCALE) */
! 192: #define TSL2560_M5T 0x01fc /* 0.0310 * (1 << TSL2560_LUX_SCALE) */
! 193:
! 194: #define TSL2560_K6T 0x0100 /* 0.80 * (1 << TSL2560_RATIO_SCALE) */
! 195: #define TSL2560_B6T 0x0270 /* 0.0128 * (1 << TSL2560_LUX_SCALE) */
! 196: #define TSL2560_M6T 0x03fe /* 0.0153 * (1 << TSL2560_LUX_SCALE) */
! 197:
! 198: #define TSL2560_K7T 0x019a /* 1.3 * (1 << TSL2560_RATIO_SCALE) */
! 199: #define TSL2560_B7T 0x0018 /* 0.00146 * (1 << TSL2560_LUX_SCALE) */
! 200: #define TSL2560_M7T 0x0012 /* 0.00112 * (1 << TSL2560_LUX_SCALE) */
! 201:
! 202: u_int64_t
! 203: tsl_lux(u_int32_t chan0, u_int32_t chan1)
! 204: {
! 205: u_int32_t ratio, ratio1;
! 206: u_int32_t b, m;
! 207: int64_t lux;
! 208:
! 209: ratio1 = 0;
! 210: if (chan0 != 0)
! 211: ratio1 = (chan1 << (TSL2560_RATIO_SCALE + 1)) / chan0;
! 212: ratio = (ratio1 + 1) >> 1;
! 213:
! 214: b = 0, m = 0;
! 215: if (ratio <= TSL2560_K1T)
! 216: b = TSL2560_B1T, m = TSL2560_M1T;
! 217: else if (ratio <= TSL2560_K2T)
! 218: b = TSL2560_B2T, m = TSL2560_M2T;
! 219: else if (ratio <= TSL2560_K3T)
! 220: b = TSL2560_B3T, m = TSL2560_M3T;
! 221: else if (ratio <= TSL2560_K4T)
! 222: b = TSL2560_B4T, m = TSL2560_M4T;
! 223: else if (ratio <= TSL2560_K5T)
! 224: b = TSL2560_B5T, m = TSL2560_M5T;
! 225: else if (ratio <= TSL2560_K6T)
! 226: b = TSL2560_B6T, m = TSL2560_M6T;
! 227: else if (ratio <= TSL2560_K7T)
! 228: b = TSL2560_B7T, m = TSL2560_M7T;
! 229:
! 230: lux = b * chan0 - m * chan1;
! 231: if (lux < 0)
! 232: lux = 0;
! 233: return ((lux * 1000000) >> TSL2560_LUX_SCALE);
! 234: }
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