@@ -31,6 +31,8 @@ config BMP280
select REGMAP
select BMP280_I2C if (I2C)
select BMP280_SPI if (SPI_MASTER)
+ select IIO_BUFFER
+ select IIO_TRIGGERED_BUFFER
help
Say yes here to build support for Bosch Sensortec BMP180, BMP280, BMP380
and BMP580 pressure and temperature sensors. Also supports the BME280 with
@@ -41,7 +41,10 @@
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
+#include <linux/iio/buffer.h>
#include <linux/iio/iio.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/triggered_buffer.h>
#include <asm/unaligned.h>
@@ -134,6 +137,12 @@ enum {
BMP380_P11 = 20,
};
+enum bmp280_scan {
+ BMP280_PRESS,
+ BMP280_TEMP,
+ BME280_HUMID,
+};
+
static const struct iio_chan_spec bmp280_channels[] = {
{
.type = IIO_PRESSURE,
@@ -142,6 +151,13 @@ static const struct iio_chan_spec bmp280_channels[] = {
BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_SCALE) |
BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
+ .scan_index = 0,
+ .scan_type = {
+ .sign = 'u',
+ .realbits = 32,
+ .storagebits = 32,
+ .endianness = IIO_CPU,
+ },
},
{
.type = IIO_TEMP,
@@ -150,7 +166,15 @@ static const struct iio_chan_spec bmp280_channels[] = {
BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_SCALE) |
BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
+ .scan_index = 1,
+ .scan_type = {
+ .sign = 's',
+ .realbits = 32,
+ .storagebits = 32,
+ .endianness = IIO_CPU,
+ },
},
+ IIO_CHAN_SOFT_TIMESTAMP(2),
};
static const struct iio_chan_spec bme280_channels[] = {
@@ -161,6 +185,13 @@ static const struct iio_chan_spec bme280_channels[] = {
BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_SCALE) |
BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
+ .scan_index = 0,
+ .scan_type = {
+ .sign = 'u',
+ .realbits = 32,
+ .storagebits = 32,
+ .endianness = IIO_CPU,
+ },
},
{
.type = IIO_TEMP,
@@ -169,6 +200,13 @@ static const struct iio_chan_spec bme280_channels[] = {
BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_SCALE) |
BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
+ .scan_index = 1,
+ .scan_type = {
+ .sign = 's',
+ .realbits = 32,
+ .storagebits = 32,
+ .endianness = IIO_CPU,
+ },
},
{
.type = IIO_HUMIDITYRELATIVE,
@@ -177,7 +215,15 @@ static const struct iio_chan_spec bme280_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,
+ },
},
+ IIO_CHAN_SOFT_TIMESTAMP(3),
};
static const struct iio_chan_spec bmp380_channels[] = {
@@ -190,6 +236,13 @@ static const struct iio_chan_spec bmp380_channels[] = {
BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ) |
BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),
+ .scan_index = 0,
+ .scan_type = {
+ .sign = 'u',
+ .realbits = 32,
+ .storagebits = 32,
+ .endianness = IIO_CPU,
+ },
},
{
.type = IIO_TEMP,
@@ -200,7 +253,15 @@ static const struct iio_chan_spec bmp380_channels[] = {
BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO),
.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ) |
BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),
+ .scan_index = 1,
+ .scan_type = {
+ .sign = 's',
+ .realbits = 32,
+ .storagebits = 32,
+ .endianness = IIO_CPU,
+ },
},
+ IIO_CHAN_SOFT_TIMESTAMP(2),
};
static int bmp280_read_calib(struct bmp280_data *data)
@@ -316,7 +377,7 @@ static int bme280_read_humid_adc(struct bmp280_data *data, u16 *adc_humidity)
int ret;
ret = regmap_bulk_read(data->regmap, BME280_REG_HUMIDITY_MSB,
- &data->be16, sizeof(data->be16));
+ &data->be16, BME280_NUM_HUMIDITY_BYTES);
if (ret) {
dev_err(data->dev, "failed to read humidity\n");
return ret;
@@ -362,7 +423,7 @@ static int bmp280_read_temp_adc(struct bmp280_data *data, u32 *adc_temp)
int ret;
ret = regmap_bulk_read(data->regmap, BMP280_REG_TEMP_MSB,
- data->buf, sizeof(data->buf));
+ data->buf, BMP280_NUM_TEMP_BYTES);
if (ret) {
dev_err(data->dev, "failed to read temperature\n");
return ret;
@@ -423,7 +484,7 @@ static int bmp280_read_press_adc(struct bmp280_data *data, u32 *adc_press)
int ret;
ret = regmap_bulk_read(data->regmap, BMP280_REG_PRESS_MSB,
- data->buf, sizeof(data->buf));
+ data->buf, BMP280_NUM_PRESS_BYTES);
if (ret) {
dev_err(data->dev, "failed to read pressure\n");
return ret;
@@ -874,6 +935,16 @@ static const struct iio_info bmp280_info = {
.write_raw = &bmp280_write_raw,
};
+static const unsigned long bmp280_avail_scan_masks[] = {
+ BIT(BMP280_TEMP) | BIT(BMP280_PRESS),
+ 0
+};
+
+static const unsigned long bme280_avail_scan_masks[] = {
+ BIT(BME280_HUMID) | BIT(BMP280_TEMP) | BIT(BMP280_PRESS),
+ 0
+};
+
static int bmp280_chip_config(struct bmp280_data *data)
{
u8 osrs = FIELD_PREP(BMP280_OSRS_TEMP_MASK, data->oversampling_temp + 1) |
@@ -901,6 +972,74 @@ static int bmp280_chip_config(struct bmp280_data *data)
return ret;
}
+static irqreturn_t bmp280_buffer_handler(int irq, void *p)
+{
+ struct iio_poll_func *pf = p;
+ struct iio_dev *indio_dev = pf->indio_dev;
+ struct bmp280_data *data = iio_priv(indio_dev);
+ s32 adc_temp, adc_press, adc_humidity, t_fine;
+ u8 sizeof_burst_read;
+ int ret;
+
+ guard(mutex)(&data->lock);
+
+ /*
+ * If humidity channel is enabled it means that we are called for the
+ * BME280 humidity sensor.
+ */
+ if (test_bit(BME280_HUMID, indio_dev->active_scan_mask))
+ sizeof_burst_read = BME280_BURST_READ_BYTES;
+ else
+ sizeof_burst_read = BMP280_BURST_READ_BYTES;
+
+ /* Burst read data registers */
+ ret = regmap_bulk_read(data->regmap, BMP280_REG_PRESS_MSB,
+ data->buf, sizeof_burst_read);
+ if (ret) {
+ dev_err(data->dev, "failed to burst read sensor data\n");
+ goto out;
+ }
+
+ /* Temperature calculations */
+ adc_temp = FIELD_GET(BMP280_MEAS_TRIM_MASK, get_unaligned_be24(&data->buf[3]));
+ if (adc_temp == BMP280_TEMP_SKIPPED) {
+ dev_err(data->dev, "reading temperature skipped\n");
+ goto out;
+ }
+
+ data->sensor_data[1] = bmp280_compensate_temp(data, adc_temp);
+
+ /* Pressure calculations */
+ adc_press = FIELD_GET(BMP280_MEAS_TRIM_MASK, get_unaligned_be24(&data->buf[0]));
+ if (adc_press == BMP280_PRESS_SKIPPED) {
+ dev_err(data->dev, "reading pressure skipped\n");
+ goto out;
+ }
+
+ t_fine = bmp280_calc_t_fine(data, adc_temp);
+
+ data->sensor_data[0] = bmp280_compensate_press(data, adc_press, t_fine);
+
+ /* Humidity calculations */
+ if (test_bit(BME280_HUMID, indio_dev->active_scan_mask)) {
+ adc_humidity = get_unaligned_be16(&data->buf[6]);
+
+ if (adc_humidity == BMP280_HUMIDITY_SKIPPED) {
+ dev_err(data->dev, "reading humidity skipped\n");
+ goto out;
+ }
+ data->sensor_data[2] = bme280_compensate_humidity(data, adc_humidity, t_fine);
+ }
+
+ iio_push_to_buffers_with_timestamp(indio_dev, &data->sensor_data,
+ iio_get_time_ns(indio_dev));
+
+out:
+ iio_trigger_notify_done(indio_dev->trig);
+
+ return IRQ_HANDLED;
+}
+
static const int bmp280_oversampling_avail[] = { 1, 2, 4, 8, 16 };
static const u8 bmp280_chip_ids[] = { BMP280_CHIP_ID };
static const int bmp280_temp_coeffs[] = { 10, 1 };
@@ -914,6 +1053,7 @@ const struct bmp280_chip_info bmp280_chip_info = {
.start_up_time = 2000,
.channels = bmp280_channels,
.num_channels = ARRAY_SIZE(bmp280_channels),
+ .avail_scan_masks = bmp280_avail_scan_masks,
.oversampling_temp_avail = bmp280_oversampling_avail,
.num_oversampling_temp_avail = ARRAY_SIZE(bmp280_oversampling_avail),
@@ -942,6 +1082,8 @@ const struct bmp280_chip_info bmp280_chip_info = {
.read_temp = bmp280_read_temp,
.read_press = bmp280_read_press,
.read_calib = bmp280_read_calib,
+
+ .buffer_handler = bmp280_buffer_handler,
};
EXPORT_SYMBOL_NS(bmp280_chip_info, IIO_BMP280);
@@ -975,6 +1117,7 @@ const struct bmp280_chip_info bme280_chip_info = {
.start_up_time = 2000,
.channels = bme280_channels,
.num_channels = ARRAY_SIZE(bme280_channels),
+ .avail_scan_masks = bme280_avail_scan_masks,
.oversampling_temp_avail = bmp280_oversampling_avail,
.num_oversampling_temp_avail = ARRAY_SIZE(bmp280_oversampling_avail),
@@ -1000,6 +1143,8 @@ const struct bmp280_chip_info bme280_chip_info = {
.read_press = bmp280_read_press,
.read_humid = bme280_read_humid,
.read_calib = bme280_read_calib,
+
+ .buffer_handler = bmp280_buffer_handler,
};
EXPORT_SYMBOL_NS(bme280_chip_info, IIO_BMP280);
@@ -1054,7 +1199,7 @@ static int bmp380_read_temp_adc(struct bmp280_data *data, u32 *adc_temp)
int ret;
ret = regmap_bulk_read(data->regmap, BMP380_REG_TEMP_XLSB,
- data->buf, sizeof(data->buf));
+ data->buf, BMP280_NUM_TEMP_BYTES);
if (ret) {
dev_err(data->dev, "failed to read temperature\n");
return ret;
@@ -1123,7 +1268,7 @@ static int bmp380_read_press_adc(struct bmp280_data *data, u32 *adc_press)
int ret;
ret = regmap_bulk_read(data->regmap, BMP380_REG_PRESS_XLSB,
- data->buf, sizeof(data->buf));
+ data->buf, BMP280_NUM_PRESS_BYTES);
if (ret) {
dev_err(data->dev, "failed to read pressure\n");
return ret;
@@ -1384,6 +1529,53 @@ static int bmp380_chip_config(struct bmp280_data *data)
return 0;
}
+static irqreturn_t bmp380_buffer_handler(int irq, void *p)
+{
+ struct iio_poll_func *pf = p;
+ struct iio_dev *indio_dev = pf->indio_dev;
+ struct bmp280_data *data = iio_priv(indio_dev);
+ s32 adc_temp, adc_press, t_fine;
+ int ret;
+
+ guard(mutex)(&data->lock);
+
+ /* Burst read data registers */
+ ret = regmap_bulk_read(data->regmap, BMP380_REG_PRESS_XLSB,
+ data->buf, BMP280_BURST_READ_BYTES);
+ if (ret) {
+ dev_err(data->dev, "failed to burst read sensor data\n");
+ goto out;
+ }
+
+ /* Temperature calculations */
+ adc_temp = get_unaligned_le24(&data->buf[3]);
+ if (adc_temp == BMP380_TEMP_SKIPPED) {
+ dev_err(data->dev, "reading temperature skipped\n");
+ goto out;
+ }
+
+ data->sensor_data[1] = bmp380_compensate_temp(data, adc_temp);
+
+ /* Pressure calculations */
+ adc_press = get_unaligned_le24(&data->buf[0]);
+ if (adc_press == BMP380_PRESS_SKIPPED) {
+ dev_err(data->dev, "reading pressure skipped\n");
+ goto out;
+ }
+
+ t_fine = bmp380_calc_t_fine(data, adc_temp);
+
+ data->sensor_data[0] = bmp380_compensate_press(data, adc_press, t_fine);
+
+ iio_push_to_buffers_with_timestamp(indio_dev, &data->sensor_data,
+ iio_get_time_ns(indio_dev));
+
+out:
+ iio_trigger_notify_done(indio_dev->trig);
+
+ return IRQ_HANDLED;
+}
+
static const int bmp380_oversampling_avail[] = { 1, 2, 4, 8, 16, 32 };
static const int bmp380_iir_filter_coeffs_avail[] = { 1, 2, 4, 8, 16, 32, 64, 128};
static const u8 bmp380_chip_ids[] = { BMP380_CHIP_ID, BMP390_CHIP_ID };
@@ -1398,6 +1590,7 @@ const struct bmp280_chip_info bmp380_chip_info = {
.start_up_time = 2000,
.channels = bmp380_channels,
.num_channels = ARRAY_SIZE(bmp380_channels),
+ .avail_scan_masks = bmp280_avail_scan_masks,
.oversampling_temp_avail = bmp380_oversampling_avail,
.num_oversampling_temp_avail = ARRAY_SIZE(bmp380_oversampling_avail),
@@ -1425,6 +1618,8 @@ const struct bmp280_chip_info bmp380_chip_info = {
.read_press = bmp380_read_press,
.read_calib = bmp380_read_calib,
.preinit = bmp380_preinit,
+
+ .buffer_handler = bmp380_buffer_handler,
};
EXPORT_SYMBOL_NS(bmp380_chip_info, IIO_BMP280);
@@ -1544,8 +1739,8 @@ static int bmp580_read_temp(struct bmp280_data *data, s32 *raw_temp)
{
int ret;
- ret = regmap_bulk_read(data->regmap, BMP580_REG_TEMP_XLSB, data->buf,
- sizeof(data->buf));
+ ret = regmap_bulk_read(data->regmap, BMP580_REG_TEMP_XLSB,
+ data->buf, BMP280_NUM_TEMP_BYTES);
if (ret) {
dev_err(data->dev, "failed to read temperature\n");
return ret;
@@ -1564,8 +1759,8 @@ static int bmp580_read_press(struct bmp280_data *data, u32 *raw_press)
{
int ret;
- ret = regmap_bulk_read(data->regmap, BMP580_REG_PRESS_XLSB, data->buf,
- sizeof(data->buf));
+ ret = regmap_bulk_read(data->regmap, BMP580_REG_PRESS_XLSB,
+ data->buf, BMP280_NUM_PRESS_BYTES);
if (ret) {
dev_err(data->dev, "failed to read pressure\n");
return ret;
@@ -1910,6 +2105,51 @@ static int bmp580_chip_config(struct bmp280_data *data)
return 0;
}
+static irqreturn_t bmp580_buffer_handler(int irq, void *p)
+{
+ struct iio_poll_func *pf = p;
+ struct iio_dev *indio_dev = pf->indio_dev;
+ struct bmp280_data *data = iio_priv(indio_dev);
+ s32 adc_temp, adc_press;
+ int ret;
+
+ guard(mutex)(&data->lock);
+
+ /* Burst read data registers */
+ ret = regmap_bulk_read(data->regmap, BMP580_REG_TEMP_XLSB,
+ data->buf, BMP280_BURST_READ_BYTES);
+ if (ret) {
+ dev_err(data->dev, "failed to burst read sensor data\n");
+ goto out;
+ }
+
+ /* Temperature calculations */
+ adc_temp = get_unaligned_le24(&data->buf[0]);
+ if (adc_temp == BMP580_TEMP_SKIPPED) {
+ dev_err(data->dev, "reading temperature skipped\n");
+ goto out;
+ }
+
+ data->sensor_data[1] = adc_temp;
+
+ /* Pressure calculations */
+ adc_press = get_unaligned_le24(&data->buf[3]);
+ if (adc_press == BMP380_PRESS_SKIPPED) {
+ dev_err(data->dev, "reading pressure skipped\n");
+ goto out;
+ }
+
+ data->sensor_data[0] = adc_press;
+
+ iio_push_to_buffers_with_timestamp(indio_dev, &data->sensor_data,
+ iio_get_time_ns(indio_dev));
+
+out:
+ iio_trigger_notify_done(indio_dev->trig);
+
+ return IRQ_HANDLED;
+}
+
static const int bmp580_oversampling_avail[] = { 1, 2, 4, 8, 16, 32, 64, 128 };
static const u8 bmp580_chip_ids[] = { BMP580_CHIP_ID, BMP580_CHIP_ID_ALT };
static const int bmp580_temp_coeffs[] = { 1000, 16 };
@@ -1923,6 +2163,7 @@ const struct bmp280_chip_info bmp580_chip_info = {
.start_up_time = 2000,
.channels = bmp380_channels,
.num_channels = ARRAY_SIZE(bmp380_channels),
+ .avail_scan_masks = bmp280_avail_scan_masks,
.oversampling_temp_avail = bmp580_oversampling_avail,
.num_oversampling_temp_avail = ARRAY_SIZE(bmp580_oversampling_avail),
@@ -1949,6 +2190,8 @@ const struct bmp280_chip_info bmp580_chip_info = {
.read_temp = bmp580_read_temp,
.read_press = bmp580_read_press,
.preinit = bmp580_preinit,
+
+ .buffer_handler = bmp580_buffer_handler,
};
EXPORT_SYMBOL_NS(bmp580_chip_info, IIO_BMP280);
@@ -2127,7 +2370,7 @@ static int bmp180_read_press_adc(struct bmp280_data *data, u32 *adc_press)
return ret;
ret = regmap_bulk_read(data->regmap, BMP180_REG_OUT_MSB,
- data->buf, sizeof(data->buf));
+ data->buf, BMP280_NUM_PRESS_BYTES);
if (ret) {
dev_err(data->dev, "failed to read pressure\n");
return ret;
@@ -2198,6 +2441,36 @@ static int bmp180_chip_config(struct bmp280_data *data)
return 0;
}
+static irqreturn_t bmp180_buffer_handler(int irq, void *p)
+{
+ struct iio_poll_func *pf = p;
+ struct iio_dev *indio_dev = pf->indio_dev;
+ struct bmp280_data *data = iio_priv(indio_dev);
+ int ret, chan_value;
+
+ guard(mutex)(&data->lock);
+
+ ret = bmp180_read_temp(data, &chan_value);
+ if (ret)
+ goto out;
+
+ data->sensor_data[1] = chan_value;
+
+ ret = bmp180_read_press(data, &chan_value);
+ if (ret)
+ goto out;
+
+ data->sensor_data[0] = chan_value;
+
+ iio_push_to_buffers_with_timestamp(indio_dev, &data->sensor_data,
+ iio_get_time_ns(indio_dev));
+
+out:
+ iio_trigger_notify_done(indio_dev->trig);
+
+ return IRQ_HANDLED;
+}
+
static const int bmp180_oversampling_temp_avail[] = { 1 };
static const int bmp180_oversampling_press_avail[] = { 1, 2, 4, 8 };
static const u8 bmp180_chip_ids[] = { BMP180_CHIP_ID };
@@ -2212,6 +2485,7 @@ const struct bmp280_chip_info bmp180_chip_info = {
.start_up_time = 2000,
.channels = bmp280_channels,
.num_channels = ARRAY_SIZE(bmp280_channels),
+ .avail_scan_masks = bmp280_avail_scan_masks,
.oversampling_temp_avail = bmp180_oversampling_temp_avail,
.num_oversampling_temp_avail =
@@ -2232,6 +2506,8 @@ const struct bmp280_chip_info bmp180_chip_info = {
.read_temp = bmp180_read_temp,
.read_press = bmp180_read_press,
.read_calib = bmp180_read_calib,
+
+ .buffer_handler = bmp180_buffer_handler,
};
EXPORT_SYMBOL_NS(bmp180_chip_info, IIO_BMP280);
@@ -2277,6 +2553,30 @@ static int bmp085_fetch_eoc_irq(struct device *dev,
return 0;
}
+static int bmp280_buffer_preenable(struct iio_dev *indio_dev)
+{
+ struct bmp280_data *data = iio_priv(indio_dev);
+
+ pm_runtime_get_sync(data->dev);
+
+ return 0;
+}
+
+static int bmp280_buffer_postdisable(struct iio_dev *indio_dev)
+{
+ struct bmp280_data *data = iio_priv(indio_dev);
+
+ pm_runtime_mark_last_busy(data->dev);
+ pm_runtime_put_autosuspend(data->dev);
+
+ return 0;
+}
+
+const struct iio_buffer_setup_ops bmp280_buffer_setup_ops = {
+ .preenable = bmp280_buffer_preenable,
+ .postdisable = bmp280_buffer_postdisable,
+};
+
static void bmp280_pm_disable(void *data)
{
struct device *dev = data;
@@ -2323,6 +2623,7 @@ int bmp280_common_probe(struct device *dev,
/* Apply initial values from chip info structure */
indio_dev->channels = chip_info->channels;
indio_dev->num_channels = chip_info->num_channels;
+ indio_dev->available_scan_masks = chip_info->avail_scan_masks;
data->oversampling_press = chip_info->oversampling_press_default;
data->oversampling_humid = chip_info->oversampling_humid_default;
data->oversampling_temp = chip_info->oversampling_temp_default;
@@ -2408,6 +2709,14 @@ int bmp280_common_probe(struct device *dev,
"failed to read calibration coefficients\n");
}
+ ret = devm_iio_triggered_buffer_setup(data->dev, indio_dev,
+ iio_pollfunc_store_time,
+ data->chip_info->buffer_handler,
+ NULL);
+ if (ret)
+ return dev_err_probe(data->dev, ret,
+ "iio triggered buffer setup failed\n");
+
/*
* Attempt to grab an optional EOC IRQ - only the BMP085 has this
* however as it happens, the BMP085 shares the chip ID of BMP180
@@ -40,14 +40,10 @@ static int bmp380_regmap_spi_read(void *context, const void *reg,
size_t reg_size, void *val, size_t val_size)
{
struct spi_device *spi = to_spi_device(context);
- u8 rx_buf[4];
+ u8 rx_buf[BME280_BURST_READ_BYTES + 1];
ssize_t status;
- /*
- * Maximum number of consecutive bytes read for a temperature or
- * pressure measurement is 3.
- */
- if (val_size > 3)
+ if (val_size > BME280_BURST_READ_BYTES)
return -EINVAL;
/*
@@ -304,6 +304,16 @@
#define BMP280_PRESS_SKIPPED 0x80000
#define BMP280_HUMIDITY_SKIPPED 0x8000
+/* Number of bytes for each value */
+#define BMP280_NUM_PRESS_BYTES 3
+#define BMP280_NUM_TEMP_BYTES 3
+#define BME280_NUM_HUMIDITY_BYTES 2
+#define BMP280_BURST_READ_BYTES (BMP280_NUM_PRESS_BYTES + \
+ BMP280_NUM_TEMP_BYTES)
+#define BME280_BURST_READ_BYTES (BMP280_NUM_PRESS_BYTES + \
+ BMP280_NUM_TEMP_BYTES + \
+ BME280_NUM_HUMIDITY_BYTES)
+
/* Core exported structs */
static const char *const bmp280_supply_names[] = {
@@ -397,13 +407,19 @@ struct bmp280_data {
*/
int sampling_freq;
+ /*
+ * Data to push to userspace triggered buffer. Up to 3 channels and
+ * s64 timestamp, aligned.
+ */
+ s32 sensor_data[6] __aligned(8);
+
/*
* DMA (thus cache coherency maintenance) may require the
* transfer buffers to live in their own cache lines.
*/
union {
/* Sensor data buffer */
- u8 buf[3];
+ u8 buf[BME280_BURST_READ_BYTES];
/* Calibration data buffers */
__le16 bmp280_cal_buf[BMP280_CONTIGUOUS_CALIB_REGS / 2];
__be16 bmp180_cal_buf[BMP180_REG_CALIB_COUNT / 2];
@@ -424,6 +440,7 @@ struct bmp280_chip_info {
const struct iio_chan_spec *channels;
int num_channels;
unsigned int start_up_time;
+ const unsigned long *avail_scan_masks;
const int *oversampling_temp_avail;
int num_oversampling_temp_avail;
@@ -458,6 +475,8 @@ struct bmp280_chip_info {
int (*read_humid)(struct bmp280_data *data, u32 *adc_humidity);
int (*read_calib)(struct bmp280_data *data);
int (*preinit)(struct bmp280_data *data);
+
+ irqreturn_t (*buffer_handler)(int irq, void *p);
};
/* Chip infos for each variant */
BMP2xx, BME280, BMP3xx, and BMP5xx use continuous buffers for their temperature, pressure and humidity readings. This facilitates the use of burst/bulk reads in order to acquire data faster. The approach is different from the one used in oneshot captures. BMP085 & BMP1xx devices use a completely different measurement process that is well defined and is used in their buffer_handler(). Suggested-by: Angel Iglesias <ang.iglesiasg@gmail.com> Signed-off-by: Vasileios Amoiridis <vassilisamir@gmail.com> --- drivers/iio/pressure/Kconfig | 2 + drivers/iio/pressure/bmp280-core.c | 329 ++++++++++++++++++++++++++++- drivers/iio/pressure/bmp280-spi.c | 8 +- drivers/iio/pressure/bmp280.h | 21 +- 4 files changed, 343 insertions(+), 17 deletions(-)