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android13/device/google/contexthub/firmware/os/drivers/si_si7034/si7034a10.c

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/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <atomic.h>
#include <gpio.h>
#include <nanohubPacket.h>
#include <plat/exti.h>
#include <plat/gpio.h>
#include <platform.h>
#include <plat/syscfg.h>
#include <sensors.h>
#include <seos.h>
#include <slab.h>
#include <i2c.h>
#include <timer.h>
#include <stdlib.h>
#include <string.h>
#include <variant/variant.h>
#define SI7034A10_APP_ID APP_ID_MAKE(NANOHUB_VENDOR_GOOGLE, 22)
/* Sensor defs */
#define SI7034_ID_SAMPLE 0xFF
#define SI7034_ID_PROD 0x22
#define SI7034_RESET_CMD 0xFE
#define SI7034_READID_0_CMD 0xFC
#define SI7034_READID_1_CMD 0xC9
#define SI7034_READDATA_0_CMD 0x7C
#define SI7034_READDATA_1_CMD 0xA2
#define SI7034_HUMIGRADES(humi_val) ((humi_val * 12500) >> 13)
#define SI7034_CENTIGRADES(temp_val) (((temp_val * 21875) >> 13) - 45000)
#define INFO_PRINT(fmt, ...) \
do { \
osLog(LOG_INFO, "%s " fmt, "[SI7034]", ##__VA_ARGS__); \
} while (0);
#define DEBUG_PRINT(fmt, ...) \
do { \
if (SI7034_DBG_ENABLED) { \
osLog(LOG_DEBUG, "%s " fmt, "[SI7034]", ##__VA_ARGS__); \
} \
} while (0);
#define ERROR_PRINT(fmt, ...) \
do { \
osLog(LOG_ERROR, "%s " fmt, "[SI7034]", ##__VA_ARGS__); \
} while (0);
/* DO NOT MODIFY, just to avoid compiler error if not defined using FLAGS */
#ifndef SI7034_DBG_ENABLED
#define SI7034_DBG_ENABLED 0
#endif /* SI7034_DBG_ENABLED */
enum si7034SensorEvents
{
EVT_SENSOR_I2C = EVT_APP_START + 1,
EVT_SENSOR_HUMIDITY_TIMER,
EVT_SENSOR_TEMP_TIMER,
EVT_TEST,
};
enum si7034SensorState {
SENSOR_BOOT,
SENSOR_VERIFY_ID,
SENSOR_READ_SAMPLES,
};
#ifndef SI7034A10_I2C_BUS_ID
#error "SI7034A10_I2C_BUS_ID is not defined; please define in variant.h"
#endif
#ifndef SI7034A10_I2C_SPEED
#define SI7034A10_I2C_SPEED 400000
#endif
#ifndef SI7034A10_I2C_ADDR
#define SI7034A10_I2C_ADDR 0x70
#endif
enum si7034SensorIndex {
HUMIDITY = 0,
TEMP,
NUM_OF_SENSOR,
};
struct si7034Sensor {
uint32_t handle;
};
#define SI7034_MAX_PENDING_I2C_REQUESTS 4
#define SI7034_MAX_I2C_TRANSFER_SIZE 6
struct I2cTransfer
{
size_t tx;
size_t rx;
int err;
uint8_t txrxBuf[SI7034_MAX_I2C_TRANSFER_SIZE];
uint8_t state;
bool inUse;
};
/* Task structure */
struct si7034Task {
uint32_t tid;
/* timer */
uint32_t humiTimerHandle;
uint32_t tempTimerHandle;
/* sensor flags */
bool humiOn;
bool humiReading;
bool tempOn;
bool tempReading;
struct I2cTransfer transfers[SI7034_MAX_PENDING_I2C_REQUESTS];
/* sensors */
struct si7034Sensor sensors[NUM_OF_SENSOR];
};
static struct si7034Task mTask;
// Allocate a buffer and mark it as in use with the given state, or return NULL
// if no buffers available. Must *not* be called from interrupt context.
static struct I2cTransfer *allocXfer(uint8_t state)
{
size_t i;
for (i = 0; i < ARRAY_SIZE(mTask.transfers); i++) {
if (!mTask.transfers[i].inUse) {
mTask.transfers[i].inUse = true;
mTask.transfers[i].state = state;
return &mTask.transfers[i];
}
}
ERROR_PRINT("Ran out of i2c buffers!");
return NULL;
}
static inline void releaseXfer(struct I2cTransfer *xfer)
{
xfer->inUse = false;
}
static void i2cCallback(void *cookie, size_t tx, size_t rx, int err)
{
struct I2cTransfer *xfer = cookie;
xfer->tx = tx;
xfer->rx = rx;
xfer->err = err;
osEnqueuePrivateEvt(EVT_SENSOR_I2C, cookie, NULL, mTask.tid);
if (err != 0)
ERROR_PRINT("i2c error (tx: %d, rx: %d, err: %d)\n", tx, rx, err);
}
static bool si7034_i2c_read(uint8_t addr0, uint8_t addr1, uint8_t state)
{
struct I2cTransfer *xfer = allocXfer(state);
int ret = -1;
if (xfer != NULL) {
xfer->txrxBuf[0] = addr0;
xfer->txrxBuf[1] = addr1;
ret = i2cMasterTxRx(SI7034A10_I2C_BUS_ID, SI7034A10_I2C_ADDR,
xfer->txrxBuf, 2, xfer->txrxBuf, 6, i2cCallback, xfer);
if (ret) {
releaseXfer(xfer);
return false;
}
}
return (ret == -1) ? false : true;
}
static bool si7034_i2c_write(uint8_t data, uint8_t state)
{
struct I2cTransfer *xfer = allocXfer(state);
int ret = -1;
if (xfer != NULL) {
xfer->txrxBuf[0] = data;
ret = i2cMasterTx(SI7034A10_I2C_BUS_ID, SI7034A10_I2C_ADDR,
xfer->txrxBuf, 1, i2cCallback, xfer);
if (ret) {
releaseXfer(xfer);
return false;
}
}
return (ret == -1) ? false : true;
}
/* Sensor Info */
static void sensorHumiTimerCallback(uint32_t timerId, void *data)
{
osEnqueuePrivateEvt(EVT_SENSOR_HUMIDITY_TIMER, data, NULL, mTask.tid);
}
static void sensorTempTimerCallback(uint32_t timerId, void *data)
{
osEnqueuePrivateEvt(EVT_SENSOR_TEMP_TIMER, data, NULL, mTask.tid);
}
#define DEC_INFO(name, type, axis, inter, samples, rates) \
.sensorName = name, \
.sensorType = type, \
.numAxis = axis, \
.interrupt = inter, \
.minSamples = samples, \
.supportedRates = rates
static uint32_t si7034Rates[] = {
SENSOR_HZ(0.1),
SENSOR_HZ(1.0f),
SENSOR_HZ(5.0f),
SENSOR_HZ(10.0f),
SENSOR_HZ(25.0f),
0
};
// should match "supported rates in length" and be the timer length for that rate in nanosecs
static const uint64_t si7034RatesRateVals[] =
{
10 * 1000000000ULL,
1 * 1000000000ULL,
1000000000ULL / 5,
1000000000ULL / 10,
1000000000ULL / 25,
};
static const struct SensorInfo si7034SensorInfo[NUM_OF_SENSOR] =
{
{ DEC_INFO("Humidity", SENS_TYPE_HUMIDITY, NUM_AXIS_EMBEDDED, NANOHUB_INT_NONWAKEUP,
300, si7034Rates) },
{ DEC_INFO("Temperature", SENS_TYPE_AMBIENT_TEMP, NUM_AXIS_EMBEDDED, NANOHUB_INT_NONWAKEUP,
20, si7034Rates) },
};
/* Sensor Operations */
static bool humiPower(bool on, void *cookie)
{
DEBUG_PRINT("%s: %d\n", __func__, on);
if (mTask.humiTimerHandle) {
timTimerCancel(mTask.humiTimerHandle);
mTask.humiTimerHandle = 0;
mTask.humiReading = false;
}
mTask.humiOn = on;
return sensorSignalInternalEvt(mTask.sensors[HUMIDITY].handle,
SENSOR_INTERNAL_EVT_POWER_STATE_CHG, on, 0);
}
static bool humiFwUpload(void *cookie)
{
DEBUG_PRINT("%s\n", __func__);
return sensorSignalInternalEvt(mTask.sensors[HUMIDITY].handle,
SENSOR_INTERNAL_EVT_FW_STATE_CHG, 1, 0);
}
static bool humiSetRate(uint32_t rate, uint64_t latency, void *cookie)
{
DEBUG_PRINT("%s %ld (%lld)\n", __func__, rate, latency);
if (mTask.humiTimerHandle)
timTimerCancel(mTask.humiTimerHandle);
mTask.humiTimerHandle = timTimerSet(sensorTimerLookupCommon(si7034Rates,
si7034RatesRateVals, rate), 0, 50, sensorHumiTimerCallback, NULL, false);
return sensorSignalInternalEvt(mTask.sensors[HUMIDITY].handle,
SENSOR_INTERNAL_EVT_RATE_CHG, rate, latency);
}
static bool humiFlush(void *cookie)
{
return osEnqueueEvt(sensorGetMyEventType(SENS_TYPE_HUMIDITY), SENSOR_DATA_EVENT_FLUSH, NULL);
}
static bool tempPower(bool on, void *cookie)
{
DEBUG_PRINT("%s: %d\n", __func__, on);
if (mTask.tempTimerHandle) {
timTimerCancel(mTask.tempTimerHandle);
mTask.tempTimerHandle = 0;
mTask.tempReading = false;
}
mTask.tempOn = on;
return sensorSignalInternalEvt(mTask.sensors[TEMP].handle,
SENSOR_INTERNAL_EVT_POWER_STATE_CHG, on, 0);
}
static bool tempFwUpload(void *cookie)
{
DEBUG_PRINT("%s\n", __func__);
return sensorSignalInternalEvt(mTask.sensors[TEMP].handle,
SENSOR_INTERNAL_EVT_FW_STATE_CHG, 1, 0);
}
static bool tempSetRate(uint32_t rate, uint64_t latency, void *cookie)
{
DEBUG_PRINT("%s %ld (%lld)\n", __func__, rate, latency);
if (mTask.tempTimerHandle)
timTimerCancel(mTask.tempTimerHandle);
mTask.tempTimerHandle = timTimerSet(sensorTimerLookupCommon(si7034Rates,
si7034RatesRateVals, rate), 0, 50, sensorTempTimerCallback, NULL, false);
return sensorSignalInternalEvt(mTask.sensors[TEMP].handle,
SENSOR_INTERNAL_EVT_RATE_CHG, rate, latency);
}
static bool tempFlush(void *cookie)
{
return osEnqueueEvt(sensorGetMyEventType(SENS_TYPE_AMBIENT_TEMP), SENSOR_DATA_EVENT_FLUSH, NULL);
}
#define DEC_OPS(power, firmware, rate, flush, cal, cfg) \
.sensorPower = power, \
.sensorFirmwareUpload = firmware, \
.sensorSetRate = rate, \
.sensorFlush = flush, \
.sensorCalibrate = cal, \
.sensorCfgData = cfg
static const struct SensorOps si7034SensorOps[NUM_OF_SENSOR] =
{
{ DEC_OPS(humiPower, humiFwUpload, humiSetRate, humiFlush, NULL, NULL) },
{ DEC_OPS(tempPower, tempFwUpload, tempSetRate, tempFlush, NULL, NULL) },
};
static void handleI2cEvent(const void *evtData)
{
struct I2cTransfer *xfer = (struct I2cTransfer *)evtData;
union EmbeddedDataPoint sample;
uint32_t value;
uint8_t i;
switch (xfer->state) {
case SENSOR_BOOT:
if (!si7034_i2c_read(SI7034_READID_0_CMD, SI7034_READID_1_CMD, SENSOR_VERIFY_ID)) {
DEBUG_PRINT("Not able to read ID\n");
return;
}
break;
case SENSOR_VERIFY_ID:
/* Check the sensor ID */
if (xfer->err != 0)
return;
INFO_PRINT("Device ID = (%02x)\n", xfer->txrxBuf[0]);
if ((xfer->txrxBuf[0] != SI7034_ID_SAMPLE) &&
(xfer->txrxBuf[0] != SI7034_ID_PROD))
break;
INFO_PRINT("detected\n");
for (i = 0; i < NUM_OF_SENSOR; i++)
sensorRegisterInitComplete(mTask.sensors[i].handle);
/* TEST the environment in standalone mode */
if (SI7034_DBG_ENABLED) {
mTask.humiOn = mTask.tempOn = true;
osEnqueuePrivateEvt(EVT_TEST, NULL, NULL, mTask.tid);
}
break;
case SENSOR_READ_SAMPLES:
if (mTask.humiOn && mTask.humiReading) {
value = ((uint32_t)(xfer->txrxBuf[3]) << 8) | xfer->txrxBuf[4];
value = SI7034_HUMIGRADES(value);
value = (value > 100000) ? 100000 : value;
DEBUG_PRINT("Humidity = %u\n", (unsigned)value);
sample.fdata = (float)value / 1000.0f;
osEnqueueEvt(sensorGetMyEventType(SENS_TYPE_HUMIDITY), sample.vptr, NULL);
}
if (mTask.tempOn && mTask.tempReading) {
value = ((uint32_t)(xfer->txrxBuf[0]) << 8) | xfer->txrxBuf[1];
value = SI7034_CENTIGRADES(value);
DEBUG_PRINT("Temp = %u\n", (unsigned)value);
sample.fdata = (float)value / 1000.0f;
osEnqueueEvt(sensorGetMyEventType(SENS_TYPE_AMBIENT_TEMP), sample.vptr, NULL);
}
mTask.humiReading = mTask.tempReading = false;
break;
default:
break;
}
releaseXfer(xfer);
}
static void handleEvent(uint32_t evtType, const void* evtData)
{
switch (evtType) {
case EVT_APP_START:
osEventUnsubscribe(mTask.tid, EVT_APP_START);
si7034_i2c_write(SI7034_RESET_CMD, SENSOR_BOOT);
break;
case EVT_SENSOR_I2C:
handleI2cEvent(evtData);
break;
case EVT_SENSOR_HUMIDITY_TIMER:
DEBUG_PRINT("EVT_SENSOR_HUMIDITY_TIMER\n");
if (!mTask.humiOn)
break;
/* Start sampling for a value */
if (!mTask.humiReading && !mTask.tempReading)
si7034_i2c_read(SI7034_READDATA_0_CMD, SI7034_READDATA_1_CMD, SENSOR_READ_SAMPLES);
mTask.humiReading = true;
break;
case EVT_SENSOR_TEMP_TIMER:
DEBUG_PRINT("EVT_SENSOR_TEMP_TIMER\n");
if (!mTask.tempOn)
break;
/* Start sampling for a value */
if (!mTask.humiReading && !mTask.tempReading)
si7034_i2c_read(SI7034_READDATA_0_CMD, SI7034_READDATA_1_CMD, SENSOR_READ_SAMPLES);
mTask.tempReading = true;
break;
case EVT_TEST:
DEBUG_PRINT("EVT_TEST\n");
humiSetRate(SENSOR_HZ(1), 0, NULL);
tempSetRate(SENSOR_HZ(1), 0, NULL);
break;
default:
break;
}
}
static bool startTask(uint32_t task_id)
{
uint8_t i;
mTask.tid = task_id;
DEBUG_PRINT("task started\n");
mTask.humiOn = mTask.humiReading = false;
mTask.tempOn = mTask.tempReading = false;
/* Init the communication part */
i2cMasterRequest(SI7034A10_I2C_BUS_ID, SI7034A10_I2C_SPEED);
for (i = 0; i < NUM_OF_SENSOR; i++) {
mTask.sensors[i].handle =
sensorRegister(&si7034SensorInfo[i], &si7034SensorOps[i], NULL, false);
}
osEventSubscribe(mTask.tid, EVT_APP_START);
return true;
}
static void endTask(void)
{
uint8_t i;
DEBUG_PRINT("task ended\n");
for (i = 0; i < NUM_OF_SENSOR; i++) {
sensorUnregister(mTask.sensors[i].handle);
}
}
INTERNAL_APP_INIT(SI7034A10_APP_ID, 0, startTask, endTask, handleEvent);
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