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platform/chrome: cros_ec_sensorhub: Add FIFO support

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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 <gwendal@chromium.org>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Acked-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
This commit is contained in:
Gwendal Grignou
2020-03-27 15:34:33 -07:00
committed by Enric Balletbo i Serra
parent cee416a347
commit 145d59baff
4 changed files with 603 additions and 34 deletions
Download Patch File Download Diff File Expand all files Collapse all files

88
include/linux/platform_data/cros_ec_sensorhub.h
View File

@@ -8,8 +8,13 @@
#ifndef __LINUX_PLATFORM_DATA_CROS_EC_SENSORHUB_H
#define __LINUX_PLATFORM_DATA_CROS_EC_SENSORHUB_H
#include <linux/ktime.h>
#include <linux/mutex.h>
#include <linux/notifier.h>
#include <linux/platform_data/cros_ec_commands.h>
struct iio_dev;
/**
* struct cros_ec_sensor_platform - ChromeOS EC sensor platform information.
* @sensor_num: Id of the sensor, as reported by the EC.
@@ -19,14 +24,85 @@ struct cros_ec_sensor_platform {
};
/**
* struct cros_ec_sensorhub - Sensor Hub device data.
* typedef cros_ec_sensorhub_push_data_cb_t - Callback function to send datum
* to specific sensors.
*
* @ec: Embedded Controller where the hub is located.
* @sensor_num: Number of MEMS sensors present in the EC.
* @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.
*/
struct cros_ec_sensorhub {
struct cros_ec_dev *ec;
int sensor_num;
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 */