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https://github.com/Telecominfraproject/OpenCellular.git
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284c2dbb89
We prefer to use floating-point version but we might need fixed-point version in the future if we don't have FPU support. If CONFIG_FPU flag is not set, fixed-point object temperature calculation would be used. Signed-off-by: Vic Yang <victoryang@chromium.org> BUG=chrome-os-partner:7801 TEST=none Change-Id: I69364b10bedf1351206e52266d669b4c566bd6f6
290 lines
7.1 KiB
C
290 lines
7.1 KiB
C
/* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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/* Temperature sensor module for Chrome EC */
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#include "i2c.h"
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#include "temp_sensor.h"
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#include "uart.h"
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#include "util.h"
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#include "console.h"
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#include "board.h"
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#include "task.h"
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#include "fpu.h"
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#include "math.h"
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/* Defined in board_temp_sensor.c. Must be in the same order as
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* in enum temp_sensor_id.
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*/
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extern const struct temp_sensor_t temp_sensors[TEMP_SENSOR_COUNT];
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int temp_sensor_read(enum temp_sensor_id id)
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{
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const struct temp_sensor_t *sensor;
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if (id < 0 || id >= TEMP_SENSOR_COUNT)
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return -1;
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sensor = temp_sensors + id;
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return sensor->read(sensor);
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}
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int temp_sensor_tmp006_read_die_temp(const struct temp_sensor_t* sensor)
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{
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int traw, t;
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int rv;
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int addr = sensor->addr;
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rv = i2c_read16(TMP006_PORT(addr), TMP006_REG(addr), 0x01, &traw);
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if (rv)
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return -1;
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t = (int)(int16_t)traw / 128;
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return t + 273;
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}
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/* Calculate the remote object temperature.
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* Parameters:
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* Tdie: Die temperature in 1/100 K.
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* Vobj: Voltage read from register 0. In nV.
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* S0: Sensitivity factor in 1e-17.
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* Return:
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* Object temperature in 1/100 K.
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*/
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int temp_sensor_tmp006_calculate_object_temp(int Tdie_i, int Vobj_i, int S0_i)
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{
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#ifdef CONFIG_FPU
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float Tdie, Vobj, S0;
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float Tx, S, Vos, Vx, fv, Tobj, T4;
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int Tobj_i;
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enable_fpu();
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Tdie = (float)Tdie_i * 1e-2f;
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Vobj = (float)Vobj_i * 1e-9f;
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S0 = (float)S0_i * 1e-17f;
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/* Calculate according to TMP006 users guide. */
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Tx = Tdie - 298.15f;
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/* S is the sensitivity */
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S = S0 * (1.0f + 1.75e-3f * Tx - 1.678e-5f * Tx * Tx);
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/* Vos is the offset voltage */
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Vos = -2.94e-5f - 5.7e-7f * Tx + 4.63e-9f * Tx * Tx;
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Vx = Vobj - Vos;
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/* fv is Seebeck coefficient f(Vobj) */
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fv = Vx + 13.4f * Vx * Vx;
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T4 = Tdie * Tdie * Tdie * Tdie + fv / S;
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Tobj = sqrtf(sqrtf(T4));
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Tobj_i = (int32_t)(Tobj * 100.0f);
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disable_fpu(Tobj_i);
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return Tobj_i;
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#else
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/* This is the fixed-point version of object temperature calculation.
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* Should be accurate but it is hard to prevent and debug
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* overflow/underflow problem. Only use this version if there is no
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* FPU support.
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* Division is delayed when possible to preserve precision, but should
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* not cause overflow.
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* Assuming Tdie is between 200K and 400K, and S0 between 3e-14 and
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* 9e-14, the maximum value during the calculation should be less than
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* (1 << 30), which fits in int32_t.
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*/
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int32_t Tx, S19, Vos, Vx, fv9, ub, lb;
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Tx = Tdie - 29815;
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/* S19 is the sensitivity multipled by 1e19 */
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S19 = S0 * (100000 + 175 * Tx / 100 -
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1678 * Tx / 100 * Tx / 100000) / 1000;
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/* Vos is the offset voltage in nV */
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Vos = -29400 - 570 * Tx / 100 + 463 * Tx / 100 * Tx / 10000;
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Vx = Vobj - Vos;
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/* fv9 is Seebeck coefficient f(Vobj) multipled by 1e9 */
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fv9 = Vx + 134 * Vx / 100000 * Vx / 100000;
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/* The last step in the calculation involves square root, so we use
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* binary search.
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* Assuming the object temperature is between 200K and 400K, the search
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* should take at most 14 iterations.
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*/
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ub = 40000;
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lb = 20000;
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while (lb != ub) {
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int32_t t, rhs, lhs;
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t = (ub + lb) / 2;
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lhs = t / 100 * t / 10000 * t / 10000 * (S19/100) / 1000 * t;
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rhs = Tdie / 100 * Tdie / 10000 * Tdie / 10000 * (S19/100) /
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1000 * Tdie + fv9 * 1000;
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if (lhs > rhs)
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ub = t;
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else
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lb = t + 1;
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}
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return ub;
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#endif
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}
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int temp_sensor_tmp006_read_object_temp(const struct temp_sensor_t* sensor)
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{
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int traw, t;
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int vraw, v;
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int rv;
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int addr = sensor->addr;
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rv = i2c_read16(TMP006_PORT(addr), TMP006_REG(addr), 0x01, &traw);
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if (rv)
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return -1;
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t = (int)(int16_t)traw / 128 + 273;
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rv = i2c_read16(TMP006_PORT(addr), TMP006_REG(addr), 0x00, &vraw);
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if (rv)
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return -1;
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v = ((int)(int16_t)vraw * 15625) / 100;
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return temp_sensor_tmp006_calculate_object_temp(t * 100, v, 6400);
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}
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void temp_sensor_tmp006_config(const struct temp_sensor_t* sensor)
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{
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int addr = sensor->addr;
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/* Configure the sensor:
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* 0x7000 = bits 14:12 = continuous conversion
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* 0x0400 = bits 11:9 = ADC conversion rate (1/sec)
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* 0x0100 = bit 8 = DRDY pin enabled */
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/* TODO: support shutdown mode for power-saving? */
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i2c_write16(TMP006_PORT(addr), TMP006_REG(addr), 0x02, 0x7500);
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}
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int temp_sensor_tmp006_print(const struct temp_sensor_t* sensor)
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{
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int vraw, v;
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int traw, t;
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int rv;
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int d;
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int addr = sensor->addr;
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uart_printf("Debug data from %s:\n", sensor->name);
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rv = i2c_read16(TMP006_PORT(addr), TMP006_REG(addr), 0xfe, &d);
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if (rv)
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return rv;
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uart_printf(" Manufacturer ID: 0x%04x\n", d);
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rv = i2c_read16(TMP006_PORT(addr), TMP006_REG(addr), 0xff, &d);
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uart_printf(" Device ID: 0x%04x\n", d);
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rv = i2c_read16(TMP006_PORT(addr), TMP006_REG(addr), 0x02, &d);
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uart_printf(" Config: 0x%04x\n", d);
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rv = i2c_read16(TMP006_PORT(addr), TMP006_REG(addr), 0x00, &vraw);
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v = ((int)(int16_t)vraw * 15625) / 100;
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uart_printf(" Voltage: 0x%04x = %d nV\n", vraw, v);
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rv = i2c_read16(TMP006_PORT(addr), TMP006_REG(addr), 0x01, &traw);
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t = ((int)(int16_t)traw * 100) / 128;
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uart_printf(" Temperature: 0x%04x = %d.%02d C\n",
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traw, t / 100, t > 0 ? t % 100 : 100 - (t % 100));
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return EC_SUCCESS;
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}
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/*****************************************************************************/
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/* Console commands */
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static int command_temps(int argc, char **argv)
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{
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int i;
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int rv = 0;
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int t;
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uart_puts("Reading temperature sensors...\n");
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for (i = 0; i < TEMP_SENSOR_COUNT; ++i) {
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uart_printf(" Temp from %s: ", temp_sensors[i].name);
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t = temp_sensor_read(i);
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if (t < 0) {
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uart_printf("Error.\n\n");
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rv = -1;
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}
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else
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uart_printf("%d K = %d C\n\n", t, t - 273);
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}
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if (rv == -1)
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return EC_ERROR_UNKNOWN;
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return EC_SUCCESS;
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}
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DECLARE_CONSOLE_COMMAND(temps, command_temps);
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static int command_sensor_info(int argc, char **argv)
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{
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int i;
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int rv, rv1;
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const struct temp_sensor_t* sensor;
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rv1 = EC_SUCCESS;
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for (i = 0; i < TEMP_SENSOR_COUNT; ++i) {
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sensor = temp_sensors + i;
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if (sensor->print == TEMP_SENSOR_NO_PRINT)
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continue;
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rv = sensor->print(sensor);
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if (rv != EC_SUCCESS)
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rv1 = rv;
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}
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return rv1;
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}
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DECLARE_CONSOLE_COMMAND(tempsinfo, command_sensor_info);
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/* TMP006 object temperature calculation command.
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* TODO: This command is only for debugging. Remove it when temporal correciton
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* is done.
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*/
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static int command_sensor_remote(int argc, char **argv)
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{
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char *e;
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int32_t Td2, Vobj9, Sm03;
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if (argc != 4) {
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uart_puts("Usage: tempcorrect <Tdie*100> <Vobj*10^9> <S0*10^11>\n");
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return EC_ERROR_UNKNOWN;
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}
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Td2 = strtoi(argv[1], &e, 0);
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if (e && *e) {
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uart_puts("Bad Tdie.\n");
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return EC_ERROR_UNKNOWN;
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}
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Vobj9 = strtoi(argv[2], &e, 0);
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if (e && *e) {
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uart_puts("Bad Vobj.\n");
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return EC_ERROR_UNKNOWN;
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}
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Sm03 = strtoi(argv[3], &e, 0);
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if (e && *e) {
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uart_puts("Bad S0.\n");
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return EC_ERROR_UNKNOWN;
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}
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uart_printf("%d\n",
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temp_sensor_tmp006_calculate_object_temp(Td2, Vobj9, Sm03));
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return EC_SUCCESS;
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}
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DECLARE_CONSOLE_COMMAND(tempremote, command_sensor_remote);
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/*****************************************************************************/
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/* Initialization */
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int temp_sensor_init(void)
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{
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return EC_SUCCESS;
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}
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