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/* $OpenBSD: tsl2560.c,v 1.2 2005/12/27 17:18:18 deraadt Exp $ */
/*
* Copyright (c) 2005 Mark Kettenis
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/sensors.h>
#include <dev/i2c/i2cvar.h>
/* TSL2560/61 registers */
#define TSL2560_REG_CONTROL 0x80
#define TSL2560_CONTROL_POWER 0x03
#define TSL2560_REG_TIMING 0x81
#define TSL2560_TIMING_GAIN 0x10 /* high gain (16x) */
#define TSL2560_TIMING_INTEG0 0x00 /* 13.7ms */
#define TSL2560_TIMING_INTEG1 0x01 /* 101ms */
#define TSL2560_TIMING_INTEG2 0x02 /* 402ms */
#define TSL2560_REG_ID 0x8a
#define TSL2560_REG_DATA0 0xac
#define TSL2560_REG_DATA1 0xae
struct tsl_softc {
struct device sc_dev;
i2c_tag_t sc_tag;
i2c_addr_t sc_addr;
struct sensor sc_sensor;
};
int tsl_match(struct device *, void *, void *);
void tsl_attach(struct device *, struct device *, void *);
void tsl_refresh(void *);
u_int64_t tsl_lux(u_int32_t, u_int32_t);
struct cfattach tsl_ca = {
sizeof(struct tsl_softc), tsl_match, tsl_attach
};
struct cfdriver tsl_cd = {
NULL, "tsl", DV_DULL
};
int
tsl_match(struct device *parent, void *match, void *aux)
{
struct i2c_attach_args *ia = aux;
if (strcmp(ia->ia_name, "tsl2560") == 0)
return (1);
return (0);
}
void
tsl_attach(struct device *parent, struct device *self, void *aux)
{
struct tsl_softc *sc = (struct tsl_softc *)self;
struct i2c_attach_args *ia = aux;
u_int8_t cmd, data;
sc->sc_tag = ia->ia_tag;
sc->sc_addr = ia->ia_addr;
iic_acquire_bus(sc->sc_tag, 0);
cmd = TSL2560_REG_CONTROL; data = TSL2560_CONTROL_POWER;
if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP,
sc->sc_addr, &cmd, 1, &data, 1, 0)) {
iic_release_bus(sc->sc_tag, 0);
printf(": power up failed\n");
return;
}
cmd = TSL2560_REG_TIMING;
data = TSL2560_TIMING_GAIN | TSL2560_TIMING_INTEG2;
if (iic_exec(sc->sc_tag, I2C_OP_WRITE_WITH_STOP,
sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0)) {
iic_release_bus(sc->sc_tag, 0);
printf(": cannot write timing register\n");
return;
}
cmd = TSL2560_REG_ID;
if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0)) {
iic_release_bus(sc->sc_tag, 0);
printf(": cannot read ID register\n");
return;
}
iic_release_bus(sc->sc_tag, 0);
switch (data >> 4) {
case 0:
printf(": TSL2560 rev %x", data & 0x0f);
break;
case 1:
printf(": TSL2561 rev %x", data & 0x0f);
break;
default:
printf(": unknown part number %x", data >> 4);
break;
}
/* Initialize sensor data. */
strlcpy(sc->sc_sensor.device, sc->sc_dev.dv_xname,
sizeof(sc->sc_sensor.device));
sc->sc_sensor.type = SENSOR_LUX;
strlcpy(sc->sc_sensor.desc, "LUX", sizeof(sc->sc_sensor.desc));
if (sensor_task_register(sc, tsl_refresh, 5)) {
printf(": unable to register update task\n");
return;
}
SENSOR_ADD(&sc->sc_sensor);
printf("\n");
}
void
tsl_refresh(void *arg)
{
struct tsl_softc *sc = arg;
u_int8_t cmd, data[2];
u_int16_t chan0, chan1;
iic_acquire_bus(sc->sc_tag, 0);
cmd = TSL2560_REG_DATA0;
if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0)) {
iic_release_bus(sc->sc_tag, 0);
sc->sc_sensor.flags |= SENSOR_FINVALID;
return;
}
chan0 = data[1] << 8 | data[0];
cmd = TSL2560_REG_DATA1;
if (iic_exec(sc->sc_tag, I2C_OP_READ_WITH_STOP,
sc->sc_addr, &cmd, sizeof cmd, &data, sizeof data, 0)) {
iic_release_bus(sc->sc_tag, 0);
sc->sc_sensor.flags |= SENSOR_FINVALID;
return;
}
chan1 = data[1] << 8 | data[0];
iic_release_bus(sc->sc_tag, 0);
sc->sc_sensor.value = tsl_lux(chan0, chan1);
sc->sc_sensor.flags &= ~SENSOR_FINVALID;
}
/* Precision for fixed-point math. */
#define TSL2560_RATIO_SCALE 9
#define TSL2560_LUX_SCALE 14
/*
* The TSL2560/2561 comes in a ChipScale or TMB-6 package and the
* calibration is slightly different for each package. The constants
* below are for the TMB-6 package.
*/
#define TSL2560_K1T 0x0040 /* 0.125 * (1 << TSL2560_RATIO_SCALE) */
#define TSL2560_B1T 0x01f2 /* 0.0304 * (1 << TSL2560_LUX_SCALE) */
#define TSL2560_M1T 0x01be /* 0.0272 * (1 << TSL2560_LUX_SCALE) */
#define TSL2560_K2T 0x0080 /* 0.250 * (1 << TSL2560_RATIO_SCALE) */
#define TSL2560_B2T 0x0214 /* 0.0324 * (1 << TSL2560_LUX_SCALE) */
#define TSL2560_M2T 0x02d1 /* 0.0440 * (1 << TSL2560_LUX_SCALE) */
#define TSL2560_K3T 0x00c0 /* 0.375 * (1 << TSL2560_RATIO_SCALE) */
#define TSL2560_B3T 0x023f /* 0.0351 * (1 << TSL2560_LUX_SCALE) */
#define TSL2560_M3T 0x037b /* 0.0544 * (1 << TSL2560_LUX_SCALE) */
#define TSL2560_K4T 0x0080 /* 0.50 * (1 << TSL2560_RATIO_SCALE) */
#define TSL2560_B4T 0x0214 /* 0.0381 * (1 << TSL2560_LUX_SCALE) */
#define TSL2560_M4T 0x02d1 /* 0.0624 * (1 << TSL2560_LUX_SCALE) */
#define TSL2560_K5T 0x0138 /* 0.61 * (1 << TSL2560_RATIO_SCALE) */
#define TSL2560_B5T 0x016f /* 0.0224 * (1 << TSL2560_LUX_SCALE) */
#define TSL2560_M5T 0x01fc /* 0.0310 * (1 << TSL2560_LUX_SCALE) */
#define TSL2560_K6T 0x0100 /* 0.80 * (1 << TSL2560_RATIO_SCALE) */
#define TSL2560_B6T 0x0270 /* 0.0128 * (1 << TSL2560_LUX_SCALE) */
#define TSL2560_M6T 0x03fe /* 0.0153 * (1 << TSL2560_LUX_SCALE) */
#define TSL2560_K7T 0x019a /* 1.3 * (1 << TSL2560_RATIO_SCALE) */
#define TSL2560_B7T 0x0018 /* 0.00146 * (1 << TSL2560_LUX_SCALE) */
#define TSL2560_M7T 0x0012 /* 0.00112 * (1 << TSL2560_LUX_SCALE) */
u_int64_t
tsl_lux(u_int32_t chan0, u_int32_t chan1)
{
u_int32_t ratio, ratio1;
u_int32_t b, m;
int64_t lux;
ratio1 = 0;
if (chan0 != 0)
ratio1 = (chan1 << (TSL2560_RATIO_SCALE + 1)) / chan0;
ratio = (ratio1 + 1) >> 1;
b = 0, m = 0;
if (ratio <= TSL2560_K1T)
b = TSL2560_B1T, m = TSL2560_M1T;
else if (ratio <= TSL2560_K2T)
b = TSL2560_B2T, m = TSL2560_M2T;
else if (ratio <= TSL2560_K3T)
b = TSL2560_B3T, m = TSL2560_M3T;
else if (ratio <= TSL2560_K4T)
b = TSL2560_B4T, m = TSL2560_M4T;
else if (ratio <= TSL2560_K5T)
b = TSL2560_B5T, m = TSL2560_M5T;
else if (ratio <= TSL2560_K6T)
b = TSL2560_B6T, m = TSL2560_M6T;
else if (ratio <= TSL2560_K7T)
b = TSL2560_B7T, m = TSL2560_M7T;
lux = b * chan0 - m * chan1;
if (lux < 0)
lux = 0;
return ((lux * 1000000) >> TSL2560_LUX_SCALE);
}
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