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drivers/sensors: Enable 3-wire SPI access to HTS221 sensor driver

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HTS221 is a humidity and temperature sensor (thus HTS) that can be wired
on i2c or SPI bus. On SPI bus however, it uses the 3-wire mode, aka:
half-duplex.

Now that SPI API exposes half duplex operation, let's enable the SPI bus
on that sensor.

Let's move to a better DTS integrated driver as well, and also use
stmemsc interface.

Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
This commit is contained in:
Tomasz Bursztyka 2021-09-08 13:05:32 +02:00 committed by Carles Cufí
parent f6be2835bd
commit d5de0788ad
5 changed files with 210 additions and 104 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
drivers/sensor/hts221/CMakeLists.txt
View file

@ -4,3 +4,5 @@ zephyr_library()
zephyr_library_sources(hts221.c)
zephyr_library_sources_ifdef(CONFIG_HTS221_TRIGGER hts221_trigger.c)
zephyr_library_include_directories(../stmemsc)

6
drivers/sensor/hts221/Kconfig
View file

@ -3,9 +3,11 @@
menuconfig HTS221
bool "HTS221 temperature and humidity sensor"
depends on I2C
depends on I2C || SPI
select HAS_STMEMSC
select USE_STDC_HTS221
help
Enable driver for HTS221 I2C-based temperature and humidity sensor.
Enable driver for HTS221 I2C/SPI-based temperature and humidity sensor.
if HTS221

191
drivers/sensor/hts221/hts221.c
View file

@ -10,7 +10,6 @@
#include <init.h>
#include <sys/__assert.h>
#include <sys/byteorder.h>
#include <drivers/sensor.h>
#include <string.h>
#include <logging/log.h>
@ -18,8 +17,15 @@
LOG_MODULE_REGISTER(HTS221, CONFIG_SENSOR_LOG_LEVEL);
static const char * const hts221_odr_strings[] = {
"1", "7", "12.5"
struct str2odr {
const char *str;
hts221_odr_t odr;
};
static const struct str2odr hts221_odrs[] = {
{ "1", HTS221_ODR_1Hz },
{ "7", HTS221_ODR_7Hz },
{ "12.5", HTS221_ODR_12Hz5 },
};
static int hts221_channel_get(const struct device *dev,
@ -63,15 +69,17 @@ static int hts221_sample_fetch(const struct device *dev,
{
struct hts221_data *data = dev->data;
const struct hts221_config *cfg = dev->config;
stmdev_ctx_t *ctx = (stmdev_ctx_t *)&cfg->ctx;
uint8_t buf[4];
int status;
__ASSERT_NO_MSG(chan == SENSOR_CHAN_ALL);
if (i2c_burst_read(data->i2c, cfg->i2c_addr,
HTS221_REG_DATA_START | HTS221_AUTOINCREMENT_ADDR,
buf, 4) < 0) {
status = hts221_read_reg(ctx, HTS221_HUMIDITY_OUT_L |
HTS221_AUTOINCREMENT_ADDR, buf, 4);
if (status < 0) {
LOG_ERR("Failed to fetch data sample.");
return -EIO;
return status;
}
data->rh_sample = sys_le16_to_cpu(buf[0] | (buf[1] << 8));
@ -84,13 +92,15 @@ static int hts221_read_conversion_data(const struct device *dev)
{
struct hts221_data *data = dev->data;
const struct hts221_config *cfg = dev->config;
stmdev_ctx_t *ctx = (stmdev_ctx_t *)&cfg->ctx;
uint8_t buf[16];
int status;
if (i2c_burst_read(data->i2c, cfg->i2c_addr,
HTS221_REG_CONVERSION_START |
HTS221_AUTOINCREMENT_ADDR, buf, 16) < 0) {
status = hts221_read_reg(ctx, HTS221_H0_RH_X2 |
HTS221_AUTOINCREMENT_ADDR, buf, 16);
if (status < 0) {
LOG_ERR("Failed to read conversion data.");
return -EIO;
return status;
}
data->h0_rh_x2 = buf[0];
@ -116,45 +126,51 @@ static const struct sensor_driver_api hts221_driver_api = {
int hts221_init(const struct device *dev)
{
const struct hts221_config *cfg = dev->config;
struct hts221_data *data = dev->data;
stmdev_ctx_t *ctx = (stmdev_ctx_t *)&cfg->ctx;
uint8_t id, idx;
data->i2c = device_get_binding(cfg->i2c_bus);
if (data->i2c == NULL) {
LOG_ERR("Could not get pointer to %s device.", cfg->i2c_bus);
return -EINVAL;
}
int status;
/* check chip ID */
if (i2c_reg_read_byte(data->i2c, cfg->i2c_addr,
HTS221_REG_WHO_AM_I, &id) < 0) {
status = hts221_device_id_get(ctx, &id);
if (status < 0) {
LOG_ERR("Failed to read chip ID.");
return -EIO;
return status;
}
if (id != HTS221_CHIP_ID) {
if (id != HTS221_ID) {
LOG_ERR("Invalid chip ID.");
return -EINVAL;
}
/* check if CONFIG_HTS221_ODR is valid */
for (idx = 0U; idx < ARRAY_SIZE(hts221_odr_strings); idx++) {
if (!strcmp(hts221_odr_strings[idx], CONFIG_HTS221_ODR)) {
for (idx = 0U; idx < ARRAY_SIZE(hts221_odrs); idx++) {
if (!strcmp(hts221_odrs[idx].str, CONFIG_HTS221_ODR)) {
break;
}
}
if (idx == ARRAY_SIZE(hts221_odr_strings)) {
LOG_ERR("Invalid ODR value.");
if (idx == ARRAY_SIZE(hts221_odrs)) {
LOG_ERR("Invalid ODR value %s.", CONFIG_HTS221_ODR);
return -EINVAL;
}
if (i2c_reg_write_byte(data->i2c, cfg->i2c_addr,
HTS221_REG_CTRL1,
(idx + 1) << HTS221_ODR_SHIFT | HTS221_BDU_BIT |
HTS221_PD_BIT) < 0) {
LOG_ERR("Failed to configure chip.");
return -EIO;
status = hts221_data_rate_set(ctx, hts221_odrs[idx].odr);
if (status < 0) {
LOG_ERR("Could not set output data rate");
return status;
}
status = hts221_block_data_update_set(ctx, 1);
if (status < 0) {
LOG_ERR("Could not set BDU bit");
return status;
}
status = hts221_power_on_set(ctx, 1);
if (status < 0) {
LOG_ERR("Could not set PD bit");
return status;
}
/*
@ -163,15 +179,17 @@ int hts221_init(const struct device *dev)
*/
k_sleep(K_MSEC(3));
if (hts221_read_conversion_data(dev) < 0) {
status = hts221_read_conversion_data(dev);
if (status < 0) {
LOG_ERR("Failed to read conversion data.");
return -EINVAL;
return status;
}
#if HTS221_TRIGGER_ENABLED
if (hts221_init_interrupt(dev) < 0) {
status = hts221_init_interrupt(dev);
if (status < 0) {
LOG_ERR("Failed to initialize interrupt.");
return -EIO;
return status;
}
#else
LOG_INF("Cannot enable trigger without drdy-gpios");
@ -180,17 +198,92 @@ int hts221_init(const struct device *dev)
return 0;
}
static struct hts221_data hts221_driver;
static const struct hts221_config hts221_cfg = {
.i2c_bus = DT_INST_BUS_LABEL(0),
.i2c_addr = DT_INST_REG_ADDR(0),
#if HTS221_TRIGGER_ENABLED
.drdy_pin = DT_INST_GPIO_PIN(0, drdy_gpios),
.drdy_flags = DT_INST_GPIO_FLAGS(0, drdy_gpios),
.drdy_controller = DT_INST_GPIO_LABEL(0, drdy_gpios),
#endif /* HTS221_TRIGGER_ENABLED */
};
#if DT_NUM_INST_STATUS_OKAY(DT_DRV_COMPAT) == 0
#warning "HTS221 driver enabled without any devices"
#endif
DEVICE_DT_INST_DEFINE(0, hts221_init, NULL,
&hts221_driver, &hts221_cfg, POST_KERNEL,
CONFIG_SENSOR_INIT_PRIORITY, &hts221_driver_api);
/*
* Device creation macros
*/
#define HTS221_DEVICE_INIT(inst) \
DEVICE_DT_INST_DEFINE(inst, \
hts221_init, \
NULL, \
&hts221_data_##inst, \
&hts221_config_##inst, \
POST_KERNEL, \
CONFIG_SENSOR_INIT_PRIORITY, \
&hts221_driver_api);
/*
* Instantiation macros used when a device is on a SPI bus.
*/
#ifdef CONFIG_HTS221_TRIGGER
#define HTS221_CFG_IRQ(inst) \
.gpio_drdy = GPIO_DT_SPEC_INST_GET(inst, irq_gpios)
#else
#define HTS221_CFG_IRQ(inst)
#endif /* CONFIG_HTS221_TRIGGER */
#define HTS221_SPI_OPERATION (SPI_WORD_SET(8) | \
SPI_OP_MODE_MASTER | \
SPI_MODE_CPOL | \
SPI_MODE_CPHA | \
SPI_HALF_DUPLEX) \
#define HTS221_CONFIG_SPI(inst) \
{ \
.ctx = { \
.read_reg = \
(stmdev_read_ptr) stmemsc_spi_read, \
.write_reg = \
(stmdev_write_ptr) stmemsc_spi_write, \
.handle = \
(void *)&hts221_config_##inst.stmemsc_cfg, \
}, \
.stmemsc_cfg = { \
.spi = SPI_DT_SPEC_INST_GET(inst, \
HTS221_SPI_OPERATION, \
0), \
}, \
COND_CODE_1(DT_INST_NODE_HAS_PROP(inst, irq_gpios), \
(HTS221_CFG_IRQ(inst)), ()) \
}
/*
* Instantiation macros used when a device is on an I2C bus.
*/
#define HTS221_CONFIG_I2C(inst) \
{ \
.ctx = { \
.read_reg = \
(stmdev_read_ptr) stmemsc_i2c_read, \
.write_reg = \
(stmdev_write_ptr) stmemsc_i2c_write, \
.handle = \
(void *)&hts221_config_##inst.stmemsc_cfg, \
}, \
.stmemsc_cfg = { \
.i2c = I2C_DT_SPEC_INST_GET(inst), \
}, \
COND_CODE_1(DT_INST_NODE_HAS_PROP(inst, irq_gpios), \
(HTS221_CFG_IRQ(inst)), ()) \
}
/*
* Main instantiation macro. Use of COND_CODE_1() selects the right
* bus-specific macro at preprocessor time.
*/
#define HTS221_DEFINE(inst) \
static struct hts221_data hts221_data_##inst; \
static const struct hts221_config hts221_config_##inst = \
COND_CODE_1(DT_INST_ON_BUS(inst, spi), \
(HTS221_CONFIG_SPI(inst)), \
(HTS221_CONFIG_I2C(inst))); \
HTS221_DEVICE_INIT(inst)
DT_INST_FOREACH_STATUS_OKAY(HTS221_DEFINE)

62
drivers/sensor/hts221/hts221.h
View file

@ -10,29 +10,23 @@
#include <device.h>
#include <sys/util.h>
#include <zephyr/types.h>
#include <stmemsc.h>
#include <drivers/gpio.h>
#include <drivers/sensor.h>
#define HTS221_TRIGGER_ENABLED (DT_INST_NODE_HAS_PROP(0, drdy_gpios) && \
IS_ENABLED(CONFIG_HTS221_TRIGGER))
#include "hts221_reg.h"
#define HTS221_AUTOINCREMENT_ADDR BIT(7)
#define HTS221_AUTOINCREMENT_ADDR BIT(7)
#define HTS221_REG_WHO_AM_I 0x0F
#define HTS221_CHIP_ID 0xBC
#if DT_ANY_INST_ON_BUS_STATUS_OKAY(spi)
#include <drivers/spi.h>
#endif /* DT_ANY_INST_ON_BUS_STATUS_OKAY(spi) */
#define HTS221_REG_CTRL1 0x20
#define HTS221_PD_BIT BIT(7)
#define HTS221_BDU_BIT BIT(2)
#define HTS221_ODR_SHIFT 0
#define HTS221_REG_CTRL3 0x22
#define HTS221_DRDY_EN BIT(2)
#define HTS221_REG_DATA_START 0x28
#define HTS221_REG_CONVERSION_START 0x30
#if DT_ANY_INST_ON_BUS_STATUS_OKAY(i2c)
#include <drivers/i2c.h>
#endif /* DT_ANY_INST_ON_BUS_STATUS_OKAY(i2c) */
struct hts221_data {
const struct device *i2c;
int16_t rh_sample;
int16_t t_sample;
@ -45,9 +39,8 @@ struct hts221_data {
int16_t t0_out;
int16_t t1_out;
#if HTS221_TRIGGER_ENABLED
#ifdef CONFIG_HTS221_TRIGGER
const struct device *dev;
const struct device *drdy_dev;
struct gpio_callback drdy_cb;
struct sensor_trigger data_ready_trigger;
@ -60,26 +53,35 @@ struct hts221_data {
#elif defined(CONFIG_HTS221_TRIGGER_GLOBAL_THREAD)
struct k_work work;
#endif
#endif /* HTS221_TRIGGER_ENABLED */
#endif /* CONFIG_HTS221_TRIGGER */
};
struct hts221_config {
const char *i2c_bus;
uint16_t i2c_addr;
#if HTS221_TRIGGER_ENABLED
gpio_pin_t drdy_pin;
gpio_flags_t drdy_flags;
const char *drdy_controller;
#endif /* HTS221_TRIGGER_ENABLED */
stmdev_ctx_t ctx;
union {
#if DT_ANY_INST_ON_BUS_STATUS_OKAY(i2c)
const struct i2c_dt_spec i2c;
#endif
#if DT_ANY_INST_ON_BUS_STATUS_OKAY(spi)
const struct spi_dt_spec spi;
#endif
} stmemsc_cfg;
#ifdef CONFIG_HTS221_TRIGGER
const struct gpio_dt_spec gpio_drdy;
const struct gpio_dt_spec gpio_int;
#endif /* CONFIG_HTS221_TRIGGER */
};
#if HTS221_TRIGGER_ENABLED
#ifdef CONFIG_HTS221_TRIGGER
int hts221_trigger_set(const struct device *dev,
const struct sensor_trigger *trig,
sensor_trigger_handler_t handler);
int hts221_init_interrupt(const struct device *dev);
#endif
#endif /* CONFIG_HTS221_TRIGGER */
#endif /* __SENSOR_HTS221__ */
int hts221_spi_init(const struct device *dev);
int hts221_i2c_init(const struct device *dev);
#endif /* ZEPHYR_DRIVERS_SENSOR_HTS221_HTS221_H_ */

53
drivers/sensor/hts221/hts221_trigger.c
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2016 Intel Corporation
* Copyright (c) 2016-2021 Intel Corporation
*
* SPDX-License-Identifier: Apache-2.0
*/
@ -7,27 +7,24 @@
#define DT_DRV_COMPAT st_hts221
#include <device.h>
#include <drivers/i2c.h>
#include <sys/__assert.h>
#include <sys/util.h>
#include <kernel.h>
#include <drivers/sensor.h>
#include <logging/log.h>
#include "hts221.h"
#if HTS221_TRIGGER_ENABLED
LOG_MODULE_DECLARE(HTS221, CONFIG_SENSOR_LOG_LEVEL);
static inline void setup_drdy(const struct device *dev,
bool enable)
{
struct hts221_data *data = dev->data;
const struct hts221_config *cfg = dev->config;
unsigned int flags = enable
? GPIO_INT_EDGE_TO_ACTIVE
: GPIO_INT_DISABLE;
gpio_pin_interrupt_configure(data->drdy_dev, cfg->drdy_pin, flags);
gpio_pin_interrupt_configure_dt(&cfg->gpio_drdy, flags);
}
static inline void handle_drdy(const struct device *dev)
@ -79,7 +76,7 @@ int hts221_trigger_set(const struct device *dev,
/* If DRDY is active we probably won't get the rising edge, so
* invoke the callback manually.
*/
if (gpio_pin_get(data->drdy_dev, cfg->drdy_pin) > 0) {
if (gpio_pin_get_dt(&cfg->gpio_drdy) > 0) {
handle_drdy(dev);
}
@ -121,33 +118,44 @@ int hts221_init_interrupt(const struct device *dev)
{
struct hts221_data *data = dev->data;
const struct hts221_config *cfg = dev->config;
stmdev_ctx_t *ctx = (stmdev_ctx_t *)&cfg->ctx;
int status;
if (cfg->gpio_drdy.port == NULL) {
LOG_DBG("gpio_drdy not defined in DT");
return 0;
}
if (!device_is_ready(cfg->gpio_drdy.port)) {
LOG_ERR("device %s is not ready", cfg->gpio_drdy.port->name);
return -ENODEV;
}
data->dev = dev;
/* setup data ready gpio interrupt */
data->drdy_dev = device_get_binding(cfg->drdy_controller);
if (data->drdy_dev == NULL) {
LOG_ERR("Cannot get pointer to %s device.",
cfg->drdy_controller);
return -EINVAL;
status = gpio_pin_configure_dt(&cfg->gpio_drdy, GPIO_INPUT);
if (status < 0) {
LOG_ERR("Could not configure %s.%02u",
cfg->gpio_drdy.port->name, cfg->gpio_drdy.pin);
return status;
}
gpio_pin_configure(data->drdy_dev, cfg->drdy_pin,
GPIO_INPUT | cfg->drdy_flags);
gpio_init_callback(&data->drdy_cb,
hts221_drdy_callback,
BIT(cfg->gpio_drdy.pin));
gpio_init_callback(&data->drdy_cb, hts221_drdy_callback,
BIT(cfg->drdy_pin));
if (gpio_add_callback(data->drdy_dev, &data->drdy_cb) < 0) {
status = gpio_add_callback(cfg->gpio_drdy.port, &data->drdy_cb);
if (status < 0) {
LOG_ERR("Could not set gpio callback.");
return -EIO;
return status;
}
/* enable data-ready interrupt */
if (i2c_reg_write_byte(data->i2c, cfg->i2c_addr,
HTS221_REG_CTRL3, HTS221_DRDY_EN) < 0) {
status = hts221_drdy_on_int_set(ctx, 1);
if (status < 0) {
LOG_ERR("Could not enable data-ready interrupt.");
return -EIO;
return status;
}
#if defined(CONFIG_HTS221_TRIGGER_OWN_THREAD)
@ -166,4 +174,3 @@ int hts221_init_interrupt(const struct device *dev)
return 0;
}
#endif /* HTS221_TRIGGER_ENABLED */