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-rw-r--r--drivers/iio/chemical/Kconfig2
-rw-r--r--drivers/iio/chemical/bme680.h3
-rw-r--r--drivers/iio/chemical/bme680_core.c135
3 files changed, 139 insertions, 1 deletions
diff --git a/drivers/iio/chemical/Kconfig b/drivers/iio/chemical/Kconfig
index 6c87223f58d9..330fe0af946f 100644
--- a/drivers/iio/chemical/Kconfig
+++ b/drivers/iio/chemical/Kconfig
@@ -50,6 +50,8 @@ config BME680
select REGMAP
select BME680_I2C if I2C
select BME680_SPI if SPI
+ select IIO_BUFFER
+ select IIO_TRIGGERED_BUFFER
help
Say yes here to build support for Bosch Sensortec BME680 sensor with
temperature, pressure, humidity and gas sensing capability.
diff --git a/drivers/iio/chemical/bme680.h b/drivers/iio/chemical/bme680.h
index 77136b55e7f6..a0a7794543c8 100644
--- a/drivers/iio/chemical/bme680.h
+++ b/drivers/iio/chemical/bme680.h
@@ -66,6 +66,9 @@
/* Datasheet Section 1.1, Table 1 */
#define BME680_STARTUP_TIME_US 2000
+#define BME680_NUM_CHANNELS 4
+#define BME680_NUM_BULK_READ_REGS 15
+
/* Calibration Parameters */
#define BME680_T2_LSB_REG 0x8A
#define BME680_H2_MSB_REG 0xE1
diff --git a/drivers/iio/chemical/bme680_core.c b/drivers/iio/chemical/bme680_core.c
index ea1ee9964870..34ce29fdc722 100644
--- a/drivers/iio/chemical/bme680_core.c
+++ b/drivers/iio/chemical/bme680_core.c
@@ -16,8 +16,11 @@
#include <linux/module.h>
#include <linux/regmap.h>
+#include <linux/iio/buffer.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/triggered_buffer.h>
#include <linux/unaligned.h>
@@ -101,6 +104,13 @@ enum bme680_op_mode {
BME680_MODE_FORCED = 1,
};
+enum bme680_scan {
+ BME680_TEMP,
+ BME680_PRESS,
+ BME680_HUMID,
+ BME680_GAS,
+};
+
struct bme680_data {
struct regmap *regmap;
struct bme680_calib bme680;
@@ -111,8 +121,13 @@ struct bme680_data {
u16 heater_dur;
u16 heater_temp;
+ struct {
+ s32 chan[4];
+ aligned_s64 ts;
+ } scan;
+
union {
- u8 buf[3];
+ u8 buf[BME680_NUM_BULK_READ_REGS];
unsigned int check;
__be16 be16;
u8 bme680_cal_buf_1[BME680_CALIB_RANGE_1_LEN];
@@ -149,6 +164,13 @@ static const struct iio_chan_spec bme680_channels[] = {
BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_SCALE) |
BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
+ .scan_index = 0,
+ .scan_type = {
+ .sign = 's',
+ .realbits = 16,
+ .storagebits = 16,
+ .endianness = IIO_CPU,
+ },
},
{
.type = IIO_PRESSURE,
@@ -157,6 +179,13 @@ static const struct iio_chan_spec bme680_channels[] = {
BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_SCALE) |
BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
+ .scan_index = 1,
+ .scan_type = {
+ .sign = 'u',
+ .realbits = 32,
+ .storagebits = 32,
+ .endianness = IIO_CPU,
+ },
},
{
.type = IIO_HUMIDITYRELATIVE,
@@ -165,11 +194,26 @@ static const struct iio_chan_spec bme680_channels[] = {
BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_SCALE) |
BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
+ .scan_index = 2,
+ .scan_type = {
+ .sign = 'u',
+ .realbits = 32,
+ .storagebits = 32,
+ .endianness = IIO_CPU,
+ },
},
{
.type = IIO_RESISTANCE,
.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
+ .scan_index = 3,
+ .scan_type = {
+ .sign = 'u',
+ .realbits = 32,
+ .storagebits = 32,
+ .endianness = IIO_CPU,
+ },
},
+ IIO_CHAN_SOFT_TIMESTAMP(4),
};
static int bme680_read_calib(struct bme680_data *data,
@@ -920,6 +964,86 @@ static const struct iio_info bme680_info = {
.attrs = &bme680_attribute_group,
};
+static const unsigned long bme680_avail_scan_masks[] = {
+ BIT(BME680_GAS) | BIT(BME680_HUMID) | BIT(BME680_PRESS) | BIT(BME680_TEMP),
+ 0
+};
+
+static irqreturn_t bme680_trigger_handler(int irq, void *p)
+{
+ struct iio_poll_func *pf = p;
+ struct iio_dev *indio_dev = pf->indio_dev;
+ struct bme680_data *data = iio_priv(indio_dev);
+ struct device *dev = regmap_get_device(data->regmap);
+ u32 adc_temp, adc_press, adc_humid;
+ u16 adc_gas_res, gas_regs_val;
+ u8 gas_range;
+ s32 t_fine;
+ int ret;
+
+ guard(mutex)(&data->lock);
+
+ ret = bme680_set_mode(data, BME680_MODE_FORCED);
+ if (ret < 0)
+ goto out;
+
+ ret = bme680_wait_for_eoc(data);
+ if (ret)
+ goto out;
+
+ ret = regmap_bulk_read(data->regmap, BME680_REG_MEAS_STAT_0,
+ data->buf, sizeof(data->buf));
+ if (ret) {
+ dev_err(dev, "failed to burst read sensor data\n");
+ goto out;
+ }
+ if (data->buf[0] & BME680_GAS_MEAS_BIT) {
+ dev_err(dev, "gas measurement incomplete\n");
+ goto out;
+ }
+
+ /* Temperature calculations */
+ adc_temp = FIELD_GET(BME680_MEAS_TRIM_MASK, get_unaligned_be24(&data->buf[5]));
+ if (adc_temp == BME680_MEAS_SKIPPED) {
+ dev_err(dev, "reading temperature skipped\n");
+ goto out;
+ }
+ data->scan.chan[0] = bme680_compensate_temp(data, adc_temp);
+ t_fine = bme680_calc_t_fine(data, adc_temp);
+
+ /* Pressure calculations */
+ adc_press = FIELD_GET(BME680_MEAS_TRIM_MASK, get_unaligned_be24(&data->buf[2]));
+ if (adc_press == BME680_MEAS_SKIPPED) {
+ dev_err(dev, "reading pressure skipped\n");
+ goto out;
+ }
+ data->scan.chan[1] = bme680_compensate_press(data, adc_press, t_fine);
+
+ /* Humidity calculations */
+ adc_humid = get_unaligned_be16(&data->buf[8]);
+ if (adc_humid == BME680_MEAS_SKIPPED) {
+ dev_err(dev, "reading humidity skipped\n");
+ goto out;
+ }
+ data->scan.chan[2] = bme680_compensate_humid(data, adc_humid, t_fine);
+
+ /* Gas calculations */
+ gas_regs_val = get_unaligned_be16(&data->buf[13]);
+ adc_gas_res = FIELD_GET(BME680_ADC_GAS_RES, gas_regs_val);
+ if ((gas_regs_val & BME680_GAS_STAB_BIT) == 0) {
+ dev_err(dev, "heater failed to reach the target temperature\n");
+ goto out;
+ }
+ gas_range = FIELD_GET(BME680_GAS_RANGE_MASK, gas_regs_val);
+ data->scan.chan[3] = bme680_compensate_gas(data, adc_gas_res, gas_range);
+
+ iio_push_to_buffers_with_timestamp(indio_dev, &data->scan,
+ iio_get_time_ns(indio_dev));
+out:
+ iio_trigger_notify_done(indio_dev->trig);
+ return IRQ_HANDLED;
+}
+
int bme680_core_probe(struct device *dev, struct regmap *regmap,
const char *name)
{
@@ -938,6 +1062,7 @@ int bme680_core_probe(struct device *dev, struct regmap *regmap,
indio_dev->name = name;
indio_dev->channels = bme680_channels;
indio_dev->num_channels = ARRAY_SIZE(bme680_channels);
+ indio_dev->available_scan_masks = bme680_avail_scan_masks;
indio_dev->info = &bme680_info;
indio_dev->modes = INDIO_DIRECT_MODE;
@@ -980,6 +1105,14 @@ int bme680_core_probe(struct device *dev, struct regmap *regmap,
return dev_err_probe(dev, ret,
"failed to set gas config data\n");
+ ret = devm_iio_triggered_buffer_setup(dev, indio_dev,
+ iio_pollfunc_store_time,
+ bme680_trigger_handler,
+ NULL);
+ if (ret)
+ return dev_err_probe(dev, ret,
+ "iio triggered buffer setup failed\n");
+
return devm_iio_device_register(dev, indio_dev);
}
EXPORT_SYMBOL_NS_GPL(bme680_core_probe, IIO_BME680);
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-25 08:23:08 +0000