From 145d59baff5944b71551ac518d7fd7d377a9c820 Mon Sep 17 00:00:00 2001 From: Gwendal Grignou Date: Fri, 27 Mar 2020 15:34:33 -0700 Subject: platform/chrome: cros_ec_sensorhub: Add FIFO support cros_ec_sensorhub registers a listener and query motion sense FIFO, spread to iio sensors registers. To test, we can use libiio: iiod& iio_readdev -u ip:localhost -T 10000 -s 25 -b 16 cros-ec-gyro | od -x Signed-off-by: Gwendal Grignou Reviewed-by: Jonathan Cameron Acked-by: Andy Shevchenko Signed-off-by: Enric Balletbo i Serra --- include/linux/platform_data/cros_ec_sensorhub.h | 76 +++++++++++++++++++++++++ 1 file changed, 76 insertions(+) (limited to 'include') diff --git a/include/linux/platform_data/cros_ec_sensorhub.h b/include/linux/platform_data/cros_ec_sensorhub.h index 7e46a47fd642..b0950814f820 100644 --- a/include/linux/platform_data/cros_ec_sensorhub.h +++ b/include/linux/platform_data/cros_ec_sensorhub.h @@ -8,8 +8,13 @@ #ifndef __LINUX_PLATFORM_DATA_CROS_EC_SENSORHUB_H #define __LINUX_PLATFORM_DATA_CROS_EC_SENSORHUB_H +#include +#include +#include #include +struct iio_dev; + /** * struct cros_ec_sensor_platform - ChromeOS EC sensor platform information. * @sensor_num: Id of the sensor, as reported by the EC. @@ -18,15 +23,86 @@ struct cros_ec_sensor_platform { u8 sensor_num; }; +/** + * typedef cros_ec_sensorhub_push_data_cb_t - Callback function to send datum + * to specific sensors. + * + * @indio_dev: The IIO device that will process the sample. + * @data: Vector array of the ring sample. + * @timestamp: Timestamp in host timespace when the sample was acquired by + * the EC. + */ +typedef int (*cros_ec_sensorhub_push_data_cb_t)(struct iio_dev *indio_dev, + s16 *data, + s64 timestamp); + +struct cros_ec_sensorhub_sensor_push_data { + struct iio_dev *indio_dev; + cros_ec_sensorhub_push_data_cb_t push_data_cb; +}; + +enum { + CROS_EC_SENSOR_LAST_TS, + CROS_EC_SENSOR_NEW_TS, + CROS_EC_SENSOR_ALL_TS +}; + +struct cros_ec_sensors_ring_sample { + u8 sensor_id; + u8 flag; + s16 vector[3]; + s64 timestamp; +} __packed; + /** * struct cros_ec_sensorhub - Sensor Hub device data. * + * @dev: Device object, mostly used for logging. * @ec: Embedded Controller where the hub is located. * @sensor_num: Number of MEMS sensors present in the EC. + * @msg: Structure to send FIFO requests. + * @params: Pointer to parameters in msg. + * @resp: Pointer to responses in msg. + * @cmd_lock : Lock for sending msg. + * @notifier: Notifier to kick the FIFO interrupt. + * @ring: Preprocessed ring to store events. + * @fifo_timestamp: array for event timestamp and spreading. + * @fifo_info: copy of FIFO information coming from the EC. + * @fifo_size: size of the ring. + * @push_data: array of callback to send datums to iio sensor object. */ struct cros_ec_sensorhub { + struct device *dev; struct cros_ec_dev *ec; int sensor_num; + + struct cros_ec_command *msg; + struct ec_params_motion_sense *params; + struct ec_response_motion_sense *resp; + struct mutex cmd_lock; /* Lock for protecting msg structure. */ + + struct notifier_block notifier; + + struct cros_ec_sensors_ring_sample *ring; + + ktime_t fifo_timestamp[CROS_EC_SENSOR_ALL_TS]; + struct ec_response_motion_sense_fifo_info *fifo_info; + int fifo_size; + + struct cros_ec_sensorhub_sensor_push_data *push_data; }; +int cros_ec_sensorhub_register_push_data(struct cros_ec_sensorhub *sensorhub, + u8 sensor_num, + struct iio_dev *indio_dev, + cros_ec_sensorhub_push_data_cb_t cb); + +void cros_ec_sensorhub_unregister_push_data(struct cros_ec_sensorhub *sensorhub, + u8 sensor_num); + +int cros_ec_sensorhub_ring_add(struct cros_ec_sensorhub *sensorhub); +void cros_ec_sensorhub_ring_remove(void *arg); +int cros_ec_sensorhub_ring_fifo_enable(struct cros_ec_sensorhub *sensorhub, + bool on); + #endif /* __LINUX_PLATFORM_DATA_CROS_EC_SENSORHUB_H */ -- cgit v1.2.3