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Fri, 11 Oct 2024 11:38:19 -0400 (EDT) From: Justin Weiss To: Alex Lanzano , Jonathan Cameron , Lars-Peter Clausen Cc: Justin Weiss , linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, "Derek J . Clark" , =?UTF-8?q?Philip=20M=C3=BCller?= Subject: [PATCH 2/3] iio: imu: Add triggered buffer for Bosch BMI270 IMU Date: Fri, 11 Oct 2024 08:37:48 -0700 Message-ID: <20241011153751.65152-3-justin@justinweiss.com> X-Mailer: git-send-email 2.47.0 In-Reply-To: <20241011153751.65152-1-justin@justinweiss.com> References: <20241011153751.65152-1-justin@justinweiss.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Set up a triggered buffer for the accel and angl_vel values. Signed-off-by: Justin Weiss --- drivers/iio/imu/bmi270/Kconfig | 1 + drivers/iio/imu/bmi270/bmi270.h | 8 +++++ drivers/iio/imu/bmi270/bmi270_core.c | 47 ++++++++++++++++++++++++++++ 3 files changed, 56 insertions(+) diff --git a/drivers/iio/imu/bmi270/Kconfig b/drivers/iio/imu/bmi270/Kconfig index 0ffd29794fda..6362acc706da 100644 --- a/drivers/iio/imu/bmi270/Kconfig +++ b/drivers/iio/imu/bmi270/Kconfig @@ -6,6 +6,7 @@ config BMI270 tristate select IIO_BUFFER + select IIO_TRIGGERED_BUFFER =20 config BMI270_I2C tristate "Bosch BMI270 I2C driver" diff --git a/drivers/iio/imu/bmi270/bmi270.h b/drivers/iio/imu/bmi270/bmi27= 0.h index 51e374fd4290..335400c34b0d 100644 --- a/drivers/iio/imu/bmi270/bmi270.h +++ b/drivers/iio/imu/bmi270/bmi270.h @@ -11,6 +11,14 @@ struct bmi270_data { struct device *dev; struct regmap *regmap; const struct bmi270_chip_info *chip_info; + + /* + * Ensure natural alignment for timestamp if present. + * Max length needed: 2 * 3 channels + 4 bytes padding + 8 byte ts. + * If fewer channels are enabled, less space may be needed, as + * long as the timestamp is still aligned to 8 bytes. + */ + __le16 buf[12] __aligned(8); }; =20 enum bmi270_device_type { diff --git a/drivers/iio/imu/bmi270/bmi270_core.c b/drivers/iio/imu/bmi270/= bmi270_core.c index e5ee80c12166..f49db5d1bffd 100644 --- a/drivers/iio/imu/bmi270/bmi270_core.c +++ b/drivers/iio/imu/bmi270/bmi270_core.c @@ -7,6 +7,8 @@ #include =20 #include +#include +#include =20 #include "bmi270.h" =20 @@ -66,6 +68,7 @@ enum bmi270_scan { BMI270_SCAN_GYRO_X, BMI270_SCAN_GYRO_Y, BMI270_SCAN_GYRO_Z, + BMI270_SCAN_TIMESTAMP, }; =20 const struct bmi270_chip_info bmi270_chip_info[] =3D { @@ -82,6 +85,29 @@ const struct bmi270_chip_info bmi270_chip_info[] =3D { }; EXPORT_SYMBOL_NS_GPL(bmi270_chip_info, IIO_BMI270); =20 +static irqreturn_t bmi270_trigger_handler(int irq, void *p) +{ + struct iio_poll_func *pf =3D p; + struct iio_dev *indio_dev =3D pf->indio_dev; + struct bmi270_data *bmi270_device =3D iio_priv(indio_dev); + int i, ret, j =3D 0, base =3D BMI270_ACCEL_X_REG; + __le16 sample; + + for_each_set_bit(i, indio_dev->active_scan_mask, indio_dev->masklength) { + ret =3D regmap_bulk_read(bmi270_device->regmap, + base + i * sizeof(sample), + &sample, sizeof(sample)); + if (ret) + goto done; + bmi270_device->buf[j++] =3D sample; + } + + iio_push_to_buffers_with_timestamp(indio_dev, bmi270_device->buf, pf->tim= estamp); +done: + iio_trigger_notify_done(indio_dev->trig); + return IRQ_HANDLED; +} + static int bmi270_get_data(struct bmi270_data *bmi270_device, int chan_type, int axis, int *val) { @@ -139,6 +165,13 @@ static const struct iio_info bmi270_info =3D { .info_mask_separate =3D BIT(IIO_CHAN_INFO_RAW), \ .info_mask_shared_by_type =3D BIT(IIO_CHAN_INFO_SCALE) | \ BIT(IIO_CHAN_INFO_FREQUENCY), \ + .scan_index =3D BMI270_SCAN_ACCEL_##_axis, \ + .scan_type =3D { \ + .sign =3D 's', \ + .realbits =3D 16, \ + .storagebits =3D 16, \ + .endianness =3D IIO_LE \ + }, \ } =20 #define BMI270_ANG_VEL_CHANNEL(_axis) { \ @@ -148,6 +181,13 @@ static const struct iio_info bmi270_info =3D { .info_mask_separate =3D BIT(IIO_CHAN_INFO_RAW), \ .info_mask_shared_by_type =3D BIT(IIO_CHAN_INFO_SCALE) | \ BIT(IIO_CHAN_INFO_FREQUENCY), \ + .scan_index =3D BMI270_SCAN_GYRO_##_axis, \ + .scan_type =3D { \ + .sign =3D 's', \ + .realbits =3D 16, \ + .storagebits =3D 16, \ + .endianness =3D IIO_LE \ + }, \ } =20 static const struct iio_chan_spec bmi270_channels[] =3D { @@ -157,6 +197,7 @@ static const struct iio_chan_spec bmi270_channels[] =3D= { BMI270_ANG_VEL_CHANNEL(X), BMI270_ANG_VEL_CHANNEL(Y), BMI270_ANG_VEL_CHANNEL(Z), + IIO_CHAN_SOFT_TIMESTAMP(BMI270_SCAN_TIMESTAMP), }; =20 static int bmi270_validate_chip_id(struct bmi270_data *bmi270_device) @@ -317,6 +358,12 @@ int bmi270_core_probe(struct device *dev, struct regma= p *regmap, indio_dev->modes =3D INDIO_DIRECT_MODE; indio_dev->info =3D &bmi270_info; =20 + ret =3D devm_iio_triggered_buffer_setup(dev, indio_dev, + iio_pollfunc_store_time, + bmi270_trigger_handler, NULL); + if (ret) + return ret; + return devm_iio_device_register(dev, indio_dev); } EXPORT_SYMBOL_NS_GPL(bmi270_core_probe, IIO_BMI270); --=20 2.47.0