driver/temp_sensor/tmp006.c - chromiumos/platform/ec - Git at Google

 /* Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */

 /* TMP006 temperature sensor module for Chrome EC */

 #include "common.h"
 #include "console.h"
 #include "gpio.h"
 #include "hooks.h"
 #include "host_command.h"
 #include "i2c.h"
 #include "math.h"
 #include "task.h"
 #include "temp_sensor.h"
 #include "tmp006.h"
 #include "util.h"

 /* Console output macros */
 #define CPUTS(outstr) cputs(CC_THERMAL, outstr)
 #define CPRINTS(format, args...) cprints(CC_THERMAL, format, ## args)

 /* Constants for calculating target object temperatures */
 static const float A1 = 1.75e-3f;
 static const float A2 = -1.678e-5f;
 static const float B0 = -2.94e-5f;
 static const float B1 = -5.7e-7f;
 static const float B2 = 4.63e-9f;
 static const float C2 = 13.4f;

 /* Defined in board_temp_sensor.c. */
 extern const struct tmp006_t tmp006_sensors[TMP006_COUNT];

 /* Flags for tdata->fail */
 #define FAIL_INIT        (1 << 0)  /* Just initialized */
 #define FAIL_POWER       (1 << 1)  /* Sensor not powered */
 #define FAIL_I2C         (1 << 2)  /* I2C communication error */
 #define FAIL_NOT_READY   (1 << 3)  /* Data not ready */

 struct tmp006_data_t {
 	int v;     /* Object voltage */
 	int t[4];  /* Circular buffer of last four die temperatures */
 	int tidx;  /* Index of the current value in t[] */
 	int fail;  /* Fail flags; non-zero if last read failed */
 	float s0;  /* Sensitivity factor */
 	float b0, b1, b2;  /* Coefficients for self-heating correction */
 };

 static struct tmp006_data_t tmp006_data[TMP006_COUNT];

 /**
  * Check if sensor has power
  *
  * @param idx		Sensor index
  *
  * @return non-zero if sensor has power.
  */
 static int tmp006_has_power(int idx)
 {
 #ifdef CONFIG_TEMP_SENSOR_POWER_GPIO
 	return gpio_get_level(CONFIG_TEMP_SENSOR_POWER_GPIO);
 #else
 	return 1;
 #endif
 }

 static int tmp006_read_die_temp(const struct tmp006_data_t *tdata,
 				int *temp_ptr)
 {
 	if (tdata->fail)
 		return EC_ERROR_UNKNOWN;

 	/* Return previous die temperature */
 	*temp_ptr = tdata->t[(tdata->tidx - 1) & 0x3] / 100;
 	return EC_SUCCESS;
 }

 /**
  * Calculate the remote object temperature.
  *
  * @param tdie_i	Die temperature in 1/100 K.
  * @param vobj_i	Voltage read from register 0. In nV.
  * @param tdata		TMP006 data for this sensor.
  *
  * @return Object temperature in 1/100 K.
  */
 static int tmp006_calculate_object_temp(int tdie_i, int vobj_i,
 					const struct tmp006_data_t *tdata)
 {
 	float tdie, vobj;
 	float tx, s, vos, vx, fv, tobj, t4;
 	int tobj_i;

 	tdie = (float)tdie_i * 1e-2f;
 	vobj = (float)vobj_i * 1e-9f;

 	/* Calculate according to TMP006 users guide. */
 	tx = tdie - 298.15f;
 	/* s is the sensitivity */
 	s = tdata->s0 * (1.0f + A1 * tx + A2 * tx * tx);
 	/* vos is the offset voltage */
 	vos = tdata->b0 + tdata->b1 * tx + tdata->b2 * tx * tx;
 	vx = vobj - vos;
 	/* fv is Seebeck coefficient f(vobj) */
 	fv = vx + C2 * vx * vx;

 	t4 = tdie * tdie * tdie * tdie + fv / s;
 	tobj = sqrtf(sqrtf(t4));
 	tobj_i = (int32_t)(tobj * 100.0f);

 	return tobj_i;
 }

 /**
  * Apply TMP006 temporal correction.
  *
  * @param t1-t4		Four die temperature readings separated by 1s in 1/100K.
  * @param vobj		Voltage read from register 0, in nV.
  *
  * @return Corrected object voltage in 1/100K.
  */
 static int tmp006_correct_object_voltage(int t1, int t2, int t3, int t4,
 					 int vobj)
 {
 	int tslope = 3 * t1 + t2 - t3 - 3 * t4;
 	return vobj + 296 * tslope;
 }

 static int tmp006_read_object_temp(const struct tmp006_data_t *tdata,
 				   int *temp_ptr)
 {
 	int pidx = (tdata->tidx - 1) & 0x3;
 	int t = tdata->t[pidx];
 	int v = tdata->v;

 	if (tdata->fail)
 		return EC_ERROR_UNKNOWN;

 	if (!tdata->s0)
 		return EC_ERROR_NOT_CALIBRATED;

 	v = tmp006_correct_object_voltage(
 		t,
 		tdata->t[(pidx + 3) & 3],
 		tdata->t[(pidx + 2) & 3],
 		tdata->t[(pidx + 1) & 3],
 		v);

 	*temp_ptr = tmp006_calculate_object_temp(t, v, tdata) / 100;

 	return EC_SUCCESS;
 }

 static int tmp006_poll_sensor(int sensor_id)
 {
 	struct tmp006_data_t *tdata = tmp006_data + sensor_id;
 	int traw, t;
 	int vraw, v;
 	int rv;
 	int addr = tmp006_sensors[sensor_id].addr;
 	int idx;

 	if (!tmp006_has_power(sensor_id)) {
 		tdata->fail |= FAIL_POWER;
 		return EC_ERROR_UNKNOWN;
 	}

 	/*
 	 * If sensor has just initialized and/or has lost power, wait for
 	 * data ready; otherwise, we read garbage data.
 	 */
 	if (tdata->fail && (FAIL_POWER | FAIL_INIT)) {
 		rv = i2c_read16(TMP006_PORT(addr), TMP006_REG(addr), 0x02, &v);
 		if (rv) {
 			tdata->fail |= FAIL_I2C;
 			return EC_ERROR_UNKNOWN;
 		} else if (!(v & 0x80)) {
 			tdata->fail |= FAIL_NOT_READY;
 			return EC_ERROR_UNKNOWN;
 		}
 	}

 	rv = i2c_read16(TMP006_PORT(addr), TMP006_REG(addr), 0x01, &traw);
 	if (rv) {
 		tdata->fail |= FAIL_I2C;
 		return EC_ERROR_UNKNOWN;
 	}

 	/* Convert temperature from raw to 1/100 K */
 	t = ((int)(int16_t)traw * 100) / 128 + 27300;

 	rv = i2c_read16(TMP006_PORT(addr), TMP006_REG(addr), 0x00, &vraw);
 	if (rv) {
 		tdata->fail |= FAIL_I2C;
 		return EC_ERROR_UNKNOWN;
 	}

 	/* Convert voltage from raw to nV */
 	v = ((int)(int16_t)vraw * 15625) / 100;

 	/*
 	 * If last read failed, set the entire temperature history to the
 	 * current temperature.  This keeps us from making inaccurate temporal
 	 * corrections based on stale data.
 	 */
 	if (tdata->fail) {
 		for (idx = 0; idx < 4; idx++)
 			tdata->t[idx] = t;
 	} else {
 		idx = tdata->tidx;
 		tdata->t[idx] = t;
 		tdata->tidx = (idx + 1) & 3;
 	}

 	tdata->v = v;
 	tdata->fail = 0;

 	return EC_SUCCESS;
 }

 int tmp006_get_val(int idx, int *temp_ptr)
 {
 	/*
 	 * Note: idx is a thermal sensor index, where the top N-1 bits are the
 	 * TMP006 index and the bottom bit is (0=die, 1=remote).
 	 */
 	int tidx = idx >> 1;
 	const struct tmp006_data_t *tdata = tmp006_data + tidx;

 	if (tdata->fail & FAIL_POWER) {
 		/*
 		 * Sensor isn't powered, or hasn't successfully provided data
 		 * since being powered.  Keep reporting not-powered until
 		 * we get good data (which will clear FAIL_POWER) or there is
 		 * an I2C error.
 		 */
 		return (tdata->fail & FAIL_I2C) ? EC_ERROR_UNKNOWN :
 			EC_ERROR_NOT_POWERED;
 	}

 	/* Check the low bit to determine which temperature to read. */
 	if ((idx & 0x1) == 0)
 		return tmp006_read_die_temp(tdata, temp_ptr);
 	else
 		return tmp006_read_object_temp(tdata, temp_ptr);
 }

 /*****************************************************************************/
 /* Hooks */

 static void tmp006_poll(void)
 {
 	int i;

 	for (i = 0; i < TMP006_COUNT; ++i)
 		tmp006_poll_sensor(i);
 }
 DECLARE_HOOK(HOOK_SECOND, tmp006_poll, HOOK_PRIO_TEMP_SENSOR);

 static void tmp006_init(void)
 {
 	int i;

 	for (i = 0; i < TMP006_COUNT; ++i) {
 		struct tmp006_data_t *tdata = tmp006_data + i;

 		/* Report error until we actually read the sensor */
 		tdata->fail = FAIL_INIT;

 		/* Use defaults for Bn params */
 		tdata->b0 = B0;
 		tdata->b1 = B1;
 		tdata->b2 = B2;
 	}
 }
 DECLARE_HOOK(HOOK_INIT, tmp006_init, HOOK_PRIO_DEFAULT);

 /*****************************************************************************/
 /* Host commands */

 int tmp006_get_calibration(struct host_cmd_handler_args *args)
 {
 	const struct ec_params_tmp006_get_calibration *p = args->params;
 	struct ec_response_tmp006_get_calibration *r = args->response;
 	const struct tmp006_data_t *tdata;

 	if (p->index >= TMP006_COUNT)
 		return EC_RES_INVALID_PARAM;

 	tdata = tmp006_data + p->index;

 	r->s0 = tdata->s0;
 	r->b0 = tdata->b0;
 	r->b1 = tdata->b1;
 	r->b2 = tdata->b2;

 	args->response_size = sizeof(*r);

 	return EC_RES_SUCCESS;
 }
 DECLARE_HOST_COMMAND(EC_CMD_TMP006_GET_CALIBRATION,
 		     tmp006_get_calibration,
 		     EC_VER_MASK(0));

 int tmp006_set_calibration(struct host_cmd_handler_args *args)
 {
 	const struct ec_params_tmp006_set_calibration *p = args->params;
 	struct tmp006_data_t *tdata;

 	if (p->index >= TMP006_COUNT)
 		return EC_RES_INVALID_PARAM;

 	tdata = tmp006_data + p->index;

 	tdata->s0 = p->s0;
 	tdata->b0 = p->b0;
 	tdata->b1 = p->b1;
 	tdata->b2 = p->b2;

 	return EC_RES_SUCCESS;
 }
 DECLARE_HOST_COMMAND(EC_CMD_TMP006_SET_CALIBRATION,
 		     tmp006_set_calibration,
 		     EC_VER_MASK(0));

 int tmp006_get_raw(struct host_cmd_handler_args *args)
 {
 	const struct ec_params_tmp006_get_raw *p = args->params;
 	struct ec_response_tmp006_get_raw *r = args->response;
 	const struct tmp006_data_t *tdata;

 	if (p->index >= TMP006_COUNT)
 		return EC_RES_INVALID_PARAM;

 	tdata = tmp006_data + p->index;

 	r->v = tdata->v;
 	r->t = tdata->t[(tdata->tidx - 1) & 0x3];

 	args->response_size = sizeof(*r);

 	return EC_RES_SUCCESS;
 }
 DECLARE_HOST_COMMAND(EC_CMD_TMP006_GET_RAW,
 		     tmp006_get_raw,
 		     EC_VER_MASK(0));

 /*****************************************************************************/
 /* Console commands */

 /**
  * Print temperature info for a sensor; used by console command.
  */
 static int tmp006_print(int idx)
 {
 	int vraw, v;
 	int traw, t;
 	int rv;
 	int d;
 	int addr = tmp006_sensors[idx].addr;


 	ccprintf("Debug data from %s:\n", tmp006_sensors[idx].name);

 	if (!tmp006_has_power(idx)) {
 		ccputs("Sensor powered off.\n");
 		return EC_ERROR_UNKNOWN;
 	}

 	rv = i2c_read16(TMP006_PORT(addr), TMP006_REG(addr), 0xfe, &d);
 	if (rv)
 		return rv;
 	ccprintf("  Manufacturer ID: 0x%04x\n", d);

 	rv = i2c_read16(TMP006_PORT(addr), TMP006_REG(addr), 0xff, &d);
 	ccprintf("  Device ID:       0x%04x\n", d);

 	rv = i2c_read16(TMP006_PORT(addr), TMP006_REG(addr), 0x02, &d);
 	ccprintf("  Config:          0x%04x\n", d);

 	rv = i2c_read16(TMP006_PORT(addr), TMP006_REG(addr), 0x00, &vraw);
 	v = ((int)(int16_t)vraw * 15625) / 100;
 	ccprintf("  Voltage:         0x%04x = %d nV\n", vraw, v);

 	rv = i2c_read16(TMP006_PORT(addr), TMP006_REG(addr), 0x01, &traw);
 	t = ((int)(int16_t)traw * 100) / 128;
 	ccprintf("  Temperature:     0x%04x = %d.%02d C\n",
 		 traw, t / 100, t > 0 ? t % 100 : 100 - (t % 100));

 	return EC_SUCCESS;
 }

 static int command_sensor_info(int argc, char **argv)
 {
 	int i;
 	int rv, rv1;

 	rv1 = EC_SUCCESS;
 	for (i = 0; i < TMP006_COUNT; i++) {
 		rv = tmp006_print(i);
 		if (rv != EC_SUCCESS)
 			rv1 = rv;
 		cflush();
 	}

 	return rv1;
 }
 DECLARE_CONSOLE_COMMAND(tmp006, command_sensor_info,
 			NULL,
 			"Print TMP006 sensors",
 			NULL);

 static int command_t6cal(int argc, char **argv)
 {
 	struct tmp006_data_t *tdata;
 	char *e;
 	int v;
 	int i;

 	if (argc < 2) {
 		ccprintf("# Name            S0          b0"
 			 "         b1          b2\n");
 		for (i = 0; i < TMP006_COUNT; i++) {
 			tdata = tmp006_data + i;
 			ccprintf("%d %-11s"
 				 "%7de-17 %7de-8 %7de-10 %7de-12\n",
 				 i, tmp006_sensors[i].name,
 				 (int)(tdata->s0 * 1e17f),
 				 (int)(tdata->b0 * 1e8f),
 				 (int)(tdata->b1 * 1e10f),
 				 (int)(tdata->b2 * 1e12f));
 		}

 		return EC_SUCCESS;
 	}

 	if (argc != 4)
 		return EC_ERROR_PARAM_COUNT;

 	i = strtoi(argv[1], &e, 0);
 	if (*e || i < 0 || i >= TMP006_COUNT)
 		return EC_ERROR_PARAM1;
 	tdata = tmp006_data + i;

 	v = strtoi(argv[3], &e, 0);
 	if (*e)
 		return EC_ERROR_PARAM3;

 	if (!strcasecmp(argv[2], "s0"))
 		tdata->s0 = (float)v * 1e-17f;
 	else if (!strcasecmp(argv[2], "b0"))
 		tdata->b0 = (float)v * 1e-8f;
 	else if (!strcasecmp(argv[2], "b1"))
 		tdata->b1 = (float)v * 1e-10f;
 	else if (!strcasecmp(argv[2], "b2"))
 		tdata->b2 = (float)v * 1e-12f;
 	else
 		return EC_ERROR_PARAM2;

 	return EC_SUCCESS;
 }
 DECLARE_CONSOLE_COMMAND(t6cal, command_t6cal,
 			"[<index> <coeff_name> <radix>]",
 			"Set/print TMP006 calibration",
 			NULL);
	/* Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
	* Use of this source code is governed by a BSD-style license that can be
	* found in the LICENSE file.
	*/

	/* TMP006 temperature sensor module for Chrome EC */

	#include "common.h"
	#include "console.h"
	#include "gpio.h"
	#include "hooks.h"
	#include "host_command.h"
	#include "i2c.h"
	#include "math.h"
	#include "task.h"
	#include "temp_sensor.h"
	#include "tmp006.h"
	#include "util.h"

	/* Console output macros */
	#define CPUTS(outstr) cputs(CC_THERMAL, outstr)
	#define CPRINTS(format, args...) cprints(CC_THERMAL, format, ## args)

	/* Constants for calculating target object temperatures */
	static const float A1 = 1.75e-3f;
	static const float A2 = -1.678e-5f;
	static const float B0 = -2.94e-5f;
	static const float B1 = -5.7e-7f;
	static const float B2 = 4.63e-9f;
	static const float C2 = 13.4f;

	/* Defined in board_temp_sensor.c. */
	extern const struct tmp006_t tmp006_sensors[TMP006_COUNT];

	/* Flags for tdata->fail */
	#define FAIL_INIT (1 << 0) /* Just initialized */
	#define FAIL_POWER (1 << 1) /* Sensor not powered */
	#define FAIL_I2C (1 << 2) /* I2C communication error */
	#define FAIL_NOT_READY (1 << 3) /* Data not ready */

	struct tmp006_data_t {
	int v; /* Object voltage */
	int t[4]; /* Circular buffer of last four die temperatures */
	int tidx; /* Index of the current value in t[] */
	int fail; /* Fail flags; non-zero if last read failed */
	float s0; /* Sensitivity factor */
	float b0, b1, b2; /* Coefficients for self-heating correction */
	};

	static struct tmp006_data_t tmp006_data[TMP006_COUNT];

	/**
	* Check if sensor has power
	*
	* @param idx Sensor index
	*
	* @return non-zero if sensor has power.
	*/
	static int tmp006_has_power(int idx)
	{
	#ifdef CONFIG_TEMP_SENSOR_POWER_GPIO
	return gpio_get_level(CONFIG_TEMP_SENSOR_POWER_GPIO);
	#else
	return 1;
	#endif
	}

	static int tmp006_read_die_temp(const struct tmp006_data_t *tdata,
	int *temp_ptr)
	{
	if (tdata->fail)
	return EC_ERROR_UNKNOWN;

	/* Return previous die temperature */
	*temp_ptr = tdata->t[(tdata->tidx - 1) & 0x3] / 100;
	return EC_SUCCESS;
	}

	/**
	* Calculate the remote object temperature.
	*
	* @param tdie_i Die temperature in 1/100 K.
	* @param vobj_i Voltage read from register 0. In nV.
	* @param tdata TMP006 data for this sensor.
	*
	* @return Object temperature in 1/100 K.
	*/
	static int tmp006_calculate_object_temp(int tdie_i, int vobj_i,
	const struct tmp006_data_t *tdata)
	{
	float tdie, vobj;
	float tx, s, vos, vx, fv, tobj, t4;
	int tobj_i;

	tdie = (float)tdie_i * 1e-2f;
	vobj = (float)vobj_i * 1e-9f;

	/* Calculate according to TMP006 users guide. */
	tx = tdie - 298.15f;
	/* s is the sensitivity */
	s = tdata->s0 * (1.0f + A1 * tx + A2 * tx * tx);
	/* vos is the offset voltage */
	vos = tdata->b0 + tdata->b1 * tx + tdata->b2 * tx * tx;
	vx = vobj - vos;
	/* fv is Seebeck coefficient f(vobj) */
	fv = vx + C2 * vx * vx;

	t4 = tdie * tdie * tdie * tdie + fv / s;
	tobj = sqrtf(sqrtf(t4));
	tobj_i = (int32_t)(tobj * 100.0f);

	return tobj_i;
	}

	/**
	* Apply TMP006 temporal correction.
	*
	* @param t1-t4 Four die temperature readings separated by 1s in 1/100K.
	* @param vobj Voltage read from register 0, in nV.
	*
	* @return Corrected object voltage in 1/100K.
	*/
	static int tmp006_correct_object_voltage(int t1, int t2, int t3, int t4,
	int vobj)
	{
	int tslope = 3 * t1 + t2 - t3 - 3 * t4;
	return vobj + 296 * tslope;
	}

	static int tmp006_read_object_temp(const struct tmp006_data_t *tdata,
	int *temp_ptr)
	{
	int pidx = (tdata->tidx - 1) & 0x3;
	int t = tdata->t[pidx];
	int v = tdata->v;

	if (tdata->fail)
	return EC_ERROR_UNKNOWN;

	if (!tdata->s0)
	return EC_ERROR_NOT_CALIBRATED;

	v = tmp006_correct_object_voltage(
	t,
	tdata->t[(pidx + 3) & 3],
	tdata->t[(pidx + 2) & 3],
	tdata->t[(pidx + 1) & 3],
	v);

	*temp_ptr = tmp006_calculate_object_temp(t, v, tdata) / 100;

	return EC_SUCCESS;
	}

	static int tmp006_poll_sensor(int sensor_id)
	{
	struct tmp006_data_t *tdata = tmp006_data + sensor_id;
	int traw, t;
	int vraw, v;
	int rv;
	int addr = tmp006_sensors[sensor_id].addr;
	int idx;

	if (!tmp006_has_power(sensor_id)) {
	tdata->fail \|= FAIL_POWER;
	return EC_ERROR_UNKNOWN;
	}

	/*
	* If sensor has just initialized and/or has lost power, wait for
	* data ready; otherwise, we read garbage data.
	*/
	if (tdata->fail && (FAIL_POWER \| FAIL_INIT)) {
	rv = i2c_read16(TMP006_PORT(addr), TMP006_REG(addr), 0x02, &v);
	if (rv) {
	tdata->fail \|= FAIL_I2C;
	return EC_ERROR_UNKNOWN;
	} else if (!(v & 0x80)) {
	tdata->fail \|= FAIL_NOT_READY;
	return EC_ERROR_UNKNOWN;
	}
	}

	rv = i2c_read16(TMP006_PORT(addr), TMP006_REG(addr), 0x01, &traw);
	if (rv) {
	tdata->fail \|= FAIL_I2C;
	return EC_ERROR_UNKNOWN;
	}

	/* Convert temperature from raw to 1/100 K */
	t = ((int)(int16_t)traw * 100) / 128 + 27300;

	rv = i2c_read16(TMP006_PORT(addr), TMP006_REG(addr), 0x00, &vraw);
	if (rv) {
	tdata->fail \|= FAIL_I2C;
	return EC_ERROR_UNKNOWN;
	}

	/* Convert voltage from raw to nV */
	v = ((int)(int16_t)vraw * 15625) / 100;

	/*
	* If last read failed, set the entire temperature history to the
	* current temperature. This keeps us from making inaccurate temporal
	* corrections based on stale data.
	*/
	if (tdata->fail) {
	for (idx = 0; idx < 4; idx++)
	tdata->t[idx] = t;
	} else {
	idx = tdata->tidx;
	tdata->t[idx] = t;
	tdata->tidx = (idx + 1) & 3;
	}

	tdata->v = v;
	tdata->fail = 0;

	return EC_SUCCESS;
	}

	int tmp006_get_val(int idx, int *temp_ptr)
	{
	/*
	* Note: idx is a thermal sensor index, where the top N-1 bits are the
	* TMP006 index and the bottom bit is (0=die, 1=remote).
	*/
	int tidx = idx >> 1;
	const struct tmp006_data_t *tdata = tmp006_data + tidx;

	if (tdata->fail & FAIL_POWER) {
	/*
	* Sensor isn't powered, or hasn't successfully provided data
	* since being powered. Keep reporting not-powered until
	* we get good data (which will clear FAIL_POWER) or there is
	* an I2C error.
	*/
	return (tdata->fail & FAIL_I2C) ? EC_ERROR_UNKNOWN :
	EC_ERROR_NOT_POWERED;
	}

	/* Check the low bit to determine which temperature to read. */
	if ((idx & 0x1) == 0)
	return tmp006_read_die_temp(tdata, temp_ptr);
	else
	return tmp006_read_object_temp(tdata, temp_ptr);
	}

	/*****************************************************************************/
	/* Hooks */

	static void tmp006_poll(void)
	{
	int i;

	for (i = 0; i < TMP006_COUNT; ++i)
	tmp006_poll_sensor(i);
	}
	DECLARE_HOOK(HOOK_SECOND, tmp006_poll, HOOK_PRIO_TEMP_SENSOR);

	static void tmp006_init(void)
	{
	int i;

	for (i = 0; i < TMP006_COUNT; ++i) {
	struct tmp006_data_t *tdata = tmp006_data + i;

	/* Report error until we actually read the sensor */
	tdata->fail = FAIL_INIT;

	/* Use defaults for Bn params */
	tdata->b0 = B0;
	tdata->b1 = B1;
	tdata->b2 = B2;
	}
	}
	DECLARE_HOOK(HOOK_INIT, tmp006_init, HOOK_PRIO_DEFAULT);

	/*****************************************************************************/
	/* Host commands */

	int tmp006_get_calibration(struct host_cmd_handler_args *args)
	{
	const struct ec_params_tmp006_get_calibration *p = args->params;
	struct ec_response_tmp006_get_calibration *r = args->response;
	const struct tmp006_data_t *tdata;

	if (p->index >= TMP006_COUNT)
	return EC_RES_INVALID_PARAM;

	tdata = tmp006_data + p->index;

	r->s0 = tdata->s0;
	r->b0 = tdata->b0;
	r->b1 = tdata->b1;
	r->b2 = tdata->b2;

	args->response_size = sizeof(*r);

	return EC_RES_SUCCESS;
	}
	DECLARE_HOST_COMMAND(EC_CMD_TMP006_GET_CALIBRATION,
	tmp006_get_calibration,
	EC_VER_MASK(0));

	int tmp006_set_calibration(struct host_cmd_handler_args *args)
	{
	const struct ec_params_tmp006_set_calibration *p = args->params;
	struct tmp006_data_t *tdata;

	if (p->index >= TMP006_COUNT)
	return EC_RES_INVALID_PARAM;

	tdata = tmp006_data + p->index;

	tdata->s0 = p->s0;
	tdata->b0 = p->b0;
	tdata->b1 = p->b1;
	tdata->b2 = p->b2;

	return EC_RES_SUCCESS;
	}
	DECLARE_HOST_COMMAND(EC_CMD_TMP006_SET_CALIBRATION,
	tmp006_set_calibration,
	EC_VER_MASK(0));

	int tmp006_get_raw(struct host_cmd_handler_args *args)
	{
	const struct ec_params_tmp006_get_raw *p = args->params;
	struct ec_response_tmp006_get_raw *r = args->response;
	const struct tmp006_data_t *tdata;

	if (p->index >= TMP006_COUNT)
	return EC_RES_INVALID_PARAM;

	tdata = tmp006_data + p->index;

	r->v = tdata->v;
	r->t = tdata->t[(tdata->tidx - 1) & 0x3];

	args->response_size = sizeof(*r);

	return EC_RES_SUCCESS;
	}
	DECLARE_HOST_COMMAND(EC_CMD_TMP006_GET_RAW,
	tmp006_get_raw,
	EC_VER_MASK(0));

	/*****************************************************************************/
	/* Console commands */

	/**
	* Print temperature info for a sensor; used by console command.
	*/
	static int tmp006_print(int idx)
	{
	int vraw, v;
	int traw, t;
	int rv;
	int d;
	int addr = tmp006_sensors[idx].addr;


	ccprintf("Debug data from %s:\n", tmp006_sensors[idx].name);

	if (!tmp006_has_power(idx)) {
	ccputs("Sensor powered off.\n");
	return EC_ERROR_UNKNOWN;
	}

	rv = i2c_read16(TMP006_PORT(addr), TMP006_REG(addr), 0xfe, &d);
	if (rv)
	return rv;
	ccprintf(" Manufacturer ID: 0x%04x\n", d);

	rv = i2c_read16(TMP006_PORT(addr), TMP006_REG(addr), 0xff, &d);
	ccprintf(" Device ID: 0x%04x\n", d);

	rv = i2c_read16(TMP006_PORT(addr), TMP006_REG(addr), 0x02, &d);
	ccprintf(" Config: 0x%04x\n", d);

	rv = i2c_read16(TMP006_PORT(addr), TMP006_REG(addr), 0x00, &vraw);
	v = ((int)(int16_t)vraw * 15625) / 100;
	ccprintf(" Voltage: 0x%04x = %d nV\n", vraw, v);

	rv = i2c_read16(TMP006_PORT(addr), TMP006_REG(addr), 0x01, &traw);
	t = ((int)(int16_t)traw * 100) / 128;
	ccprintf(" Temperature: 0x%04x = %d.%02d C\n",
	traw, t / 100, t > 0 ? t % 100 : 100 - (t % 100));

	return EC_SUCCESS;
	}

	static int command_sensor_info(int argc, char **argv)
	{
	int i;
	int rv, rv1;

	rv1 = EC_SUCCESS;
	for (i = 0; i < TMP006_COUNT; i++) {
	rv = tmp006_print(i);
	if (rv != EC_SUCCESS)
	rv1 = rv;
	cflush();
	}

	return rv1;
	}
	DECLARE_CONSOLE_COMMAND(tmp006, command_sensor_info,
	NULL,
	"Print TMP006 sensors",
	NULL);

	static int command_t6cal(int argc, char **argv)
	{
	struct tmp006_data_t *tdata;
	char *e;
	int v;
	int i;

	if (argc < 2) {
	ccprintf("# Name S0 b0"
	" b1 b2\n");
	for (i = 0; i < TMP006_COUNT; i++) {
	tdata = tmp006_data + i;
	ccprintf("%d %-11s"
	"%7de-17 %7de-8 %7de-10 %7de-12\n",
	i, tmp006_sensors[i].name,
	(int)(tdata->s0 * 1e17f),
	(int)(tdata->b0 * 1e8f),
	(int)(tdata->b1 * 1e10f),
	(int)(tdata->b2 * 1e12f));
	}

	return EC_SUCCESS;
	}

	if (argc != 4)
	return EC_ERROR_PARAM_COUNT;

	i = strtoi(argv[1], &e, 0);
	if (*e \|\| i < 0 \|\| i >= TMP006_COUNT)
	return EC_ERROR_PARAM1;
	tdata = tmp006_data + i;

	v = strtoi(argv[3], &e, 0);
	if (*e)
	return EC_ERROR_PARAM3;

	if (!strcasecmp(argv[2], "s0"))
	tdata->s0 = (float)v * 1e-17f;
	else if (!strcasecmp(argv[2], "b0"))
	tdata->b0 = (float)v * 1e-8f;
	else if (!strcasecmp(argv[2], "b1"))
	tdata->b1 = (float)v * 1e-10f;
	else if (!strcasecmp(argv[2], "b2"))
	tdata->b2 = (float)v * 1e-12f;
	else
	return EC_ERROR_PARAM2;

	return EC_SUCCESS;
	}
	DECLARE_CONSOLE_COMMAND(t6cal, command_t6cal,
	"[<index> <coeff_name> <radix>]",
	"Set/print TMP006 calibration",
	NULL);