forked from Minki/linux
iio: accel: bma400: Add triggered buffer support
Added trigger buffer support to read continuous acceleration and temperature data from device with data ready interrupt which is mapped to INT1 pin. Signed-off-by: Jagath Jog J <jagathjog1996@gmail.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Link: https://lore.kernel.org/r/20220505133021.22362-5-jagathjog1996@gmail.com Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Jagath Jog J
Jonathan Cameron
parent
12c99f859f
commit
ffe0ab6a96
@ -204,6 +204,8 @@ config BMA220
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config BMA400
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tristate "Bosch BMA400 3-Axis Accelerometer Driver"
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select REGMAP
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select IIO_BUFFER
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select IIO_TRIGGERED_BUFFER
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select BMA400_I2C if I2C
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select BMA400_SPI if SPI
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help
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@ -62,6 +62,13 @@
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#define BMA400_ACC_CONFIG2_REG 0x1b
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#define BMA400_CMD_REG 0x7e
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/* Interrupt registers */
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#define BMA400_INT_CONFIG0_REG 0x1f
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#define BMA400_INT_CONFIG1_REG 0x20
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#define BMA400_INT1_MAP_REG 0x21
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#define BMA400_INT_IO_CTRL_REG 0x24
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#define BMA400_INT_DRDY_MSK BIT(7)
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/* Chip ID of BMA 400 devices found in the chip ID register. */
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#define BMA400_ID_REG_VAL 0x90
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@ -111,6 +118,7 @@
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extern const struct regmap_config bma400_regmap_config;
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int bma400_probe(struct device *dev, struct regmap *regmap, const char *name);
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int bma400_probe(struct device *dev, struct regmap *regmap, int irq,
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const char *name);
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#endif
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@ -11,6 +11,7 @@
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* - Create channel for sensor time
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*/
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#include <linux/bitfield.h>
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#include <linux/bitops.h>
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#include <linux/device.h>
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#include <linux/kernel.h>
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@ -20,6 +21,10 @@
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#include <linux/regulator/consumer.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/buffer.h>
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#include <linux/iio/trigger.h>
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#include <linux/iio/trigger_consumer.h>
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#include <linux/iio/triggered_buffer.h>
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#include "bma400.h"
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@ -46,6 +51,13 @@ enum bma400_power_mode {
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POWER_MODE_INVALID = 0x03,
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};
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enum bma400_scan {
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BMA400_ACCL_X,
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BMA400_ACCL_Y,
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BMA400_ACCL_Z,
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BMA400_TEMP,
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};
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struct bma400_sample_freq {
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int hz;
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int uhz;
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@ -61,6 +73,14 @@ struct bma400_data {
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struct bma400_sample_freq sample_freq;
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int oversampling_ratio;
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int scale;
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struct iio_trigger *trig;
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/* Correct time stamp alignment */
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struct {
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__le16 buff[3];
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u8 temperature;
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s64 ts __aligned(8);
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} buffer __aligned(IIO_ALIGN);
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__le16 status;
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};
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static bool bma400_is_writable_reg(struct device *dev, unsigned int reg)
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@ -152,7 +172,7 @@ static const struct iio_chan_spec_ext_info bma400_ext_info[] = {
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{ }
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};
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#define BMA400_ACC_CHANNEL(_axis) { \
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#define BMA400_ACC_CHANNEL(_index, _axis) { \
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.type = IIO_ACCEL, \
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.modified = 1, \
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.channel2 = IIO_MOD_##_axis, \
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@ -164,17 +184,32 @@ static const struct iio_chan_spec_ext_info bma400_ext_info[] = {
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BIT(IIO_CHAN_INFO_SCALE) | \
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BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), \
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.ext_info = bma400_ext_info, \
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.scan_index = _index, \
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.scan_type = { \
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.sign = 's', \
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.realbits = 12, \
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.storagebits = 16, \
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.endianness = IIO_LE, \
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}, \
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}
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static const struct iio_chan_spec bma400_channels[] = {
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BMA400_ACC_CHANNEL(X),
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BMA400_ACC_CHANNEL(Y),
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BMA400_ACC_CHANNEL(Z),
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BMA400_ACC_CHANNEL(0, X),
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BMA400_ACC_CHANNEL(1, Y),
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BMA400_ACC_CHANNEL(2, Z),
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{
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.type = IIO_TEMP,
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.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ),
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.scan_index = 3,
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.scan_type = {
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.sign = 's',
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.realbits = 8,
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.storagebits = 8,
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.endianness = IIO_LE,
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},
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},
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IIO_CHAN_SOFT_TIMESTAMP(4),
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};
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static int bma400_get_temp_reg(struct bma400_data *data, int *val, int *val2)
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@ -659,6 +694,10 @@ static int bma400_init(struct bma400_data *data)
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if (ret)
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return ret;
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/* Configure INT1 pin to open drain */
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ret = regmap_write(data->regmap, BMA400_INT_IO_CTRL_REG, 0x06);
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if (ret)
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return ret;
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/*
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* Once the interrupt engine is supported we might use the
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* data_src_reg, but for now ensure this is set to the
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@ -807,6 +846,31 @@ static int bma400_write_raw_get_fmt(struct iio_dev *indio_dev,
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}
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}
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static int bma400_data_rdy_trigger_set_state(struct iio_trigger *trig,
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bool state)
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{
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struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
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struct bma400_data *data = iio_priv(indio_dev);
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int ret;
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ret = regmap_update_bits(data->regmap, BMA400_INT_CONFIG0_REG,
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BMA400_INT_DRDY_MSK,
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FIELD_PREP(BMA400_INT_DRDY_MSK, state));
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if (ret)
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return ret;
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return regmap_update_bits(data->regmap, BMA400_INT1_MAP_REG,
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BMA400_INT_DRDY_MSK,
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FIELD_PREP(BMA400_INT_DRDY_MSK, state));
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}
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static const unsigned long bma400_avail_scan_masks[] = {
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BIT(BMA400_ACCL_X) | BIT(BMA400_ACCL_Y) | BIT(BMA400_ACCL_Z),
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BIT(BMA400_ACCL_X) | BIT(BMA400_ACCL_Y) | BIT(BMA400_ACCL_Z)
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| BIT(BMA400_TEMP),
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0
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};
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static const struct iio_info bma400_info = {
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.read_raw = bma400_read_raw,
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.read_avail = bma400_read_avail,
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@ -814,7 +878,78 @@ static const struct iio_info bma400_info = {
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.write_raw_get_fmt = bma400_write_raw_get_fmt,
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};
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int bma400_probe(struct device *dev, struct regmap *regmap, const char *name)
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static const struct iio_trigger_ops bma400_trigger_ops = {
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.set_trigger_state = &bma400_data_rdy_trigger_set_state,
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.validate_device = &iio_trigger_validate_own_device,
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};
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static irqreturn_t bma400_trigger_handler(int irq, void *p)
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{
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struct iio_poll_func *pf = p;
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struct iio_dev *indio_dev = pf->indio_dev;
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struct bma400_data *data = iio_priv(indio_dev);
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int ret, temp;
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/* Lock to protect the data->buffer */
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mutex_lock(&data->mutex);
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/* bulk read six registers, with the base being the LSB register */
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ret = regmap_bulk_read(data->regmap, BMA400_X_AXIS_LSB_REG,
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&data->buffer.buff, sizeof(data->buffer.buff));
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if (ret)
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goto unlock_err;
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if (test_bit(BMA400_TEMP, indio_dev->active_scan_mask)) {
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ret = regmap_read(data->regmap, BMA400_TEMP_DATA_REG, &temp);
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if (ret)
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goto unlock_err;
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data->buffer.temperature = temp;
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}
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iio_push_to_buffers_with_timestamp(indio_dev, &data->buffer,
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iio_get_time_ns(indio_dev));
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mutex_unlock(&data->mutex);
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iio_trigger_notify_done(indio_dev->trig);
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return IRQ_HANDLED;
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unlock_err:
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mutex_unlock(&data->mutex);
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return IRQ_NONE;
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}
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static irqreturn_t bma400_interrupt(int irq, void *private)
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{
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struct iio_dev *indio_dev = private;
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struct bma400_data *data = iio_priv(indio_dev);
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int ret;
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/* Lock to protect the data->status */
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mutex_lock(&data->mutex);
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ret = regmap_bulk_read(data->regmap, BMA400_INT_STAT0_REG,
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&data->status,
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sizeof(data->status));
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/*
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* if none of the bit is set in the status register then it is
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* spurious interrupt.
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*/
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if (ret || !data->status)
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goto unlock_err;
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if (FIELD_GET(BMA400_INT_DRDY_MSK, le16_to_cpu(data->status))) {
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mutex_unlock(&data->mutex);
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iio_trigger_poll_chained(data->trig);
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return IRQ_HANDLED;
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}
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unlock_err:
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mutex_unlock(&data->mutex);
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return IRQ_NONE;
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}
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int bma400_probe(struct device *dev, struct regmap *regmap, int irq,
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const char *name)
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{
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struct iio_dev *indio_dev;
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struct bma400_data *data;
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@ -841,8 +976,40 @@ int bma400_probe(struct device *dev, struct regmap *regmap, const char *name)
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indio_dev->info = &bma400_info;
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indio_dev->channels = bma400_channels;
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indio_dev->num_channels = ARRAY_SIZE(bma400_channels);
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indio_dev->available_scan_masks = bma400_avail_scan_masks;
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indio_dev->modes = INDIO_DIRECT_MODE;
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if (irq > 0) {
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data->trig = devm_iio_trigger_alloc(dev, "%s-dev%d",
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indio_dev->name,
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iio_device_id(indio_dev));
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if (!data->trig)
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return -ENOMEM;
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data->trig->ops = &bma400_trigger_ops;
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iio_trigger_set_drvdata(data->trig, indio_dev);
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ret = devm_iio_trigger_register(data->dev, data->trig);
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if (ret)
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return dev_err_probe(data->dev, ret,
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"iio trigger register fail\n");
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indio_dev->trig = iio_trigger_get(data->trig);
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ret = devm_request_threaded_irq(dev, irq, NULL,
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&bma400_interrupt,
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IRQF_TRIGGER_RISING | IRQF_ONESHOT,
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indio_dev->name, indio_dev);
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if (ret)
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return dev_err_probe(data->dev, ret,
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"request irq %d failed\n", irq);
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}
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ret = devm_iio_triggered_buffer_setup(dev, indio_dev, NULL,
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&bma400_trigger_handler, NULL);
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if (ret)
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return dev_err_probe(data->dev, ret,
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"iio triggered buffer setup failed\n");
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return devm_iio_device_register(dev, indio_dev);
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}
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EXPORT_SYMBOL_NS(bma400_probe, IIO_BMA400);
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@ -24,7 +24,7 @@ static int bma400_i2c_probe(struct i2c_client *client,
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return PTR_ERR(regmap);
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}
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return bma400_probe(&client->dev, regmap, id->name);
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return bma400_probe(&client->dev, regmap, client->irq, id->name);
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}
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static const struct i2c_device_id bma400_i2c_ids[] = {
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@ -84,7 +84,7 @@ static int bma400_spi_probe(struct spi_device *spi)
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if (ret)
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dev_err(&spi->dev, "Failed to read chip id register\n");
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return bma400_probe(&spi->dev, regmap, id->name);
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return bma400_probe(&spi->dev, regmap, spi->irq, id->name);
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}
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static const struct spi_device_id bma400_spi_ids[] = {
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