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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 <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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/platform/chrome/Makefile
View File

@ -20,7 +20,8 @@ obj-$(CONFIG_CROS_EC_CHARDEV) += cros_ec_chardev.o
obj-$(CONFIG_CROS_EC_LIGHTBAR) += cros_ec_lightbar.o
obj-$(CONFIG_CROS_EC_VBC) += cros_ec_vbc.o
obj-$(CONFIG_CROS_EC_DEBUGFS) += cros_ec_debugfs.o
obj-$(CONFIG_CROS_EC_SENSORHUB) += cros_ec_sensorhub.o
cros-ec-sensorhub-objs := cros_ec_sensorhub.o cros_ec_sensorhub_ring.o
obj-$(CONFIG_CROS_EC_SENSORHUB) += cros-ec-sensorhub.o
obj-$(CONFIG_CROS_EC_SYSFS) += cros_ec_sysfs.o
obj-$(CONFIG_CROS_USBPD_LOGGER) += cros_usbpd_logger.o
obj-$(CONFIG_CROS_USBPD_NOTIFY) += cros_usbpd_notify.o

107
drivers/platform/chrome/cros_ec_sensorhub.c
View File

@ -50,10 +50,8 @@ static int cros_ec_sensorhub_register(struct device *dev,
struct cros_ec_sensorhub *sensorhub)
{
int sensor_type[MOTIONSENSE_TYPE_MAX] = { 0 };
struct cros_ec_command *msg = sensorhub->msg;
struct cros_ec_dev *ec = sensorhub->ec;
struct ec_params_motion_sense *params;
struct ec_response_motion_sense *resp;
struct cros_ec_command *msg;
int ret, i, sensor_num;
char *name;
@ -71,22 +69,13 @@ static int cros_ec_sensorhub_register(struct device *dev,
return -EINVAL;
}
/* Prepare a message to send INFO command to each sensor. */
msg = kzalloc(sizeof(*msg) + max(sizeof(*params), sizeof(*resp)),
GFP_KERNEL);
if (!msg)
return -ENOMEM;
msg->version = 1;
msg->command = EC_CMD_MOTION_SENSE_CMD + ec->cmd_offset;
msg->outsize = sizeof(*params);
msg->insize = sizeof(*resp);
params = (struct ec_params_motion_sense *)msg->data;
resp = (struct ec_response_motion_sense *)msg->data;
msg->insize = sizeof(struct ec_response_motion_sense);
msg->outsize = sizeof(struct ec_params_motion_sense);
for (i = 0; i < sensor_num; i++) {
params->cmd = MOTIONSENSE_CMD_INFO;
params->info.sensor_num = i;
sensorhub->params->cmd = MOTIONSENSE_CMD_INFO;
sensorhub->params->info.sensor_num = i;
ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
if (ret < 0) {
@ -95,7 +84,7 @@ static int cros_ec_sensorhub_register(struct device *dev,
continue;
}
switch (resp->info.type) {
switch (sensorhub->resp->info.type) {
case MOTIONSENSE_TYPE_ACCEL:
name = "cros-ec-accel";
break;
@ -118,15 +107,16 @@ static int cros_ec_sensorhub_register(struct device *dev,
name = "cros-ec-activity";
break;
default:
dev_warn(dev, "unknown type %d\n", resp->info.type);
dev_warn(dev, "unknown type %d\n",
sensorhub->resp->info.type);
continue;
}
ret = cros_ec_sensorhub_allocate_sensor(dev, name, i);
if (ret)
goto error;
return ret;
sensor_type[resp->info.type]++;
sensor_type[sensorhub->resp->info.type]++;
}
if (sensor_type[MOTIONSENSE_TYPE_ACCEL] >= 2)
@ -138,29 +128,41 @@ static int cros_ec_sensorhub_register(struct device *dev,
"cros-ec-lid-angle",
0);
if (ret)
goto error;
return ret;
}
kfree(msg);
return 0;
error:
kfree(msg);
return ret;
}
static int cros_ec_sensorhub_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct cros_ec_dev *ec = dev_get_drvdata(dev->parent);
struct cros_ec_sensorhub *data;
struct cros_ec_command *msg;
int ret;
int i;
msg = devm_kzalloc(dev, sizeof(struct cros_ec_command) +
max((u16)sizeof(struct ec_params_motion_sense),
ec->ec_dev->max_response), GFP_KERNEL);
if (!msg)
return -ENOMEM;
msg->command = EC_CMD_MOTION_SENSE_CMD + ec->cmd_offset;
data = devm_kzalloc(dev, sizeof(struct cros_ec_sensorhub), GFP_KERNEL);
if (!data)
return -ENOMEM;
data->ec = dev_get_drvdata(dev->parent);
mutex_init(&data->cmd_lock);
data->dev = dev;
data->ec = ec;
data->msg = msg;
data->params = (struct ec_params_motion_sense *)msg->data;
data->resp = (struct ec_response_motion_sense *)msg->data;
dev_set_drvdata(dev, data);
/* Check whether this EC is a sensor hub. */
@ -182,12 +184,63 @@ static int cros_ec_sensorhub_probe(struct platform_device *pdev)
}
}
/*
* If the EC does not have a FIFO, the sensors will query their data
* themselves via sysfs or a software trigger.
*/
if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE_FIFO)) {
ret = cros_ec_sensorhub_ring_add(data);
if (ret)
return ret;
/*
* The msg and its data is not under the control of the ring
* handler.
*/
return devm_add_action_or_reset(dev,
cros_ec_sensorhub_ring_remove,
data);
}
return 0;
}
#ifdef CONFIG_PM_SLEEP
/*
* When the EC is suspending, we must stop sending interrupt,
* we may use the same interrupt line for waking up the device.
* Tell the EC to stop sending non-interrupt event on the iio ring.
*/
static int cros_ec_sensorhub_suspend(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct cros_ec_sensorhub *sensorhub = platform_get_drvdata(pdev);
struct cros_ec_dev *ec = sensorhub->ec;
if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE_FIFO))
return cros_ec_sensorhub_ring_fifo_enable(sensorhub, false);
return 0;
}
static int cros_ec_sensorhub_resume(struct device *dev)
{
struct platform_device *pdev = to_platform_device(dev);
struct cros_ec_sensorhub *sensorhub = platform_get_drvdata(pdev);
struct cros_ec_dev *ec = sensorhub->ec;
if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE_FIFO))
return cros_ec_sensorhub_ring_fifo_enable(sensorhub, true);
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(cros_ec_sensorhub_pm_ops,
cros_ec_sensorhub_suspend,
cros_ec_sensorhub_resume);
static struct platform_driver cros_ec_sensorhub_driver = {
.driver = {
.name = DRV_NAME,
.pm = &cros_ec_sensorhub_pm_ops,
},
.probe = cros_ec_sensorhub_probe,
};

439
drivers/platform/chrome/cros_ec_sensorhub_ring.c Normal file
View File

@ -0,0 +1,439 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Driver for Chrome OS EC Sensor hub FIFO.
*
* Copyright 2020 Google LLC
*/
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/iio/iio.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_data/cros_ec_commands.h>
#include <linux/platform_data/cros_ec_proto.h>
#include <linux/platform_data/cros_ec_sensorhub.h>
#include <linux/platform_device.h>
#include <linux/sort.h>
#include <linux/slab.h>
static inline int
cros_sensorhub_send_sample(struct cros_ec_sensorhub *sensorhub,
struct cros_ec_sensors_ring_sample *sample)
{
cros_ec_sensorhub_push_data_cb_t cb;
int id = sample->sensor_id;
struct iio_dev *indio_dev;
if (id > sensorhub->sensor_num)
return -EINVAL;
cb = sensorhub->push_data[id].push_data_cb;
if (!cb)
return 0;
indio_dev = sensorhub->push_data[id].indio_dev;
if (sample->flag & MOTIONSENSE_SENSOR_FLAG_FLUSH)
return 0;
return cb(indio_dev, sample->vector, sample->timestamp);
}
/**
* cros_ec_sensorhub_register_push_data() - register the callback to the hub.
*
* @sensorhub : Sensor Hub object
* @sensor_num : The sensor the caller is interested in.
* @indio_dev : The iio device to use when a sample arrives.
* @cb : The callback to call when a sample arrives.
*
* The callback cb will be used by cros_ec_sensorhub_ring to distribute events
* from the EC.
*
* Return: 0 when callback is registered.
* EINVAL is the sensor number is invalid or the slot already used.
*/
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)
{
if (sensor_num >= sensorhub->sensor_num)
return -EINVAL;
if (sensorhub->push_data[sensor_num].indio_dev)
return -EINVAL;
sensorhub->push_data[sensor_num].indio_dev = indio_dev;
sensorhub->push_data[sensor_num].push_data_cb = cb;
return 0;
}
EXPORT_SYMBOL_GPL(cros_ec_sensorhub_register_push_data);
void cros_ec_sensorhub_unregister_push_data(struct cros_ec_sensorhub *sensorhub,
u8 sensor_num)
{
sensorhub->push_data[sensor_num].indio_dev = NULL;
sensorhub->push_data[sensor_num].push_data_cb = NULL;
}
EXPORT_SYMBOL_GPL(cros_ec_sensorhub_unregister_push_data);
/**
* cros_ec_sensorhub_ring_fifo_enable() - Enable or disable interrupt generation
* for FIFO events.
* @sensorhub: Sensor Hub object
* @on: true when events are requested.
*
* To be called before sleeping or when noone is listening.
* Return: 0 on success, or an error when we can not communicate with the EC.
*
*/
int cros_ec_sensorhub_ring_fifo_enable(struct cros_ec_sensorhub *sensorhub,
bool on)
{
int ret;
mutex_lock(&sensorhub->cmd_lock);
sensorhub->params->cmd = MOTIONSENSE_CMD_FIFO_INT_ENABLE;
sensorhub->params->fifo_int_enable.enable = on;
sensorhub->msg->outsize = sizeof(struct ec_params_motion_sense);
sensorhub->msg->insize = sizeof(struct ec_response_motion_sense);
ret = cros_ec_cmd_xfer_status(sensorhub->ec->ec_dev, sensorhub->msg);
mutex_unlock(&sensorhub->cmd_lock);
/* We expect to receive a payload of 4 bytes, ignore. */
if (ret > 0)
ret = 0;
return ret;
}
/**
* cros_ec_sensor_ring_process_event() - process one EC FIFO event
*
* @sensorhub: Sensor Hub object.
* @fifo_info: FIFO information from the EC (includes b point, EC timebase).
* @fifo_timestamp: EC IRQ, kernel timebase (aka c).
* @current_timestamp: calculated event timestamp, kernel timebase (aka a').
* @in: incoming FIFO event from EC (includes a point, EC timebase).
* @out: outgoing event to user space (includes a').
*
* Process one EC event, add it in the ring if necessary.
*
* Return: true if out event has been populated.
*/
static bool
cros_ec_sensor_ring_process_event(struct cros_ec_sensorhub *sensorhub,
const struct ec_response_motion_sense_fifo_info
*fifo_info,
const ktime_t fifo_timestamp,
ktime_t *current_timestamp,
struct ec_response_motion_sensor_data *in,
struct cros_ec_sensors_ring_sample *out)
{
const s64 now = cros_ec_get_time_ns();
int axis, async_flags;
/* Do not populate the filter based on asynchronous events. */
async_flags = in->flags &
(MOTIONSENSE_SENSOR_FLAG_ODR | MOTIONSENSE_SENSOR_FLAG_FLUSH);
if (in->flags & MOTIONSENSE_SENSOR_FLAG_TIMESTAMP && !async_flags) {
s64 new_timestamp;
/*
* Disable filtering since we might add more jitter
* if b is in a random point in time.
*/
new_timestamp = fifo_timestamp -
fifo_info->timestamp * 1000 +
in->timestamp * 1000;
/*
* The timestamp can be stale if we had to use the fifo
* info timestamp.
*/
if (new_timestamp - *current_timestamp > 0)
*current_timestamp = new_timestamp;
}
if (in->flags & MOTIONSENSE_SENSOR_FLAG_FLUSH) {
out->sensor_id = in->sensor_num;
out->timestamp = *current_timestamp;
out->flag = in->flags;
/*
* No other payload information provided with
* flush ack.
*/
return true;
}
if (in->flags & MOTIONSENSE_SENSOR_FLAG_TIMESTAMP)
/* If we just have a timestamp, skip this entry. */
return false;
/* Regular sample */
out->sensor_id = in->sensor_num;
if (*current_timestamp - now > 0)
/* If the timestamp is in the future. */
out->timestamp = now;
else
out->timestamp = *current_timestamp;
out->flag = in->flags;
for (axis = 0; axis < 3; axis++)
out->vector[axis] = in->data[axis];
return true;
}
/**
* cros_ec_sensorhub_ring_handler() - The trigger handler function
*
* @sensorhub: Sensor Hub object.
*
* Called by the notifier, process the EC sensor FIFO queue.
*/
static void cros_ec_sensorhub_ring_handler(struct cros_ec_sensorhub *sensorhub)
{
struct ec_response_motion_sense_fifo_info *fifo_info =
sensorhub->fifo_info;
struct cros_ec_dev *ec = sensorhub->ec;
ktime_t fifo_timestamp, current_timestamp;
int i, j, number_data, ret;
struct ec_response_motion_sensor_data *in;
struct cros_ec_sensors_ring_sample *out, *last_out;
mutex_lock(&sensorhub->cmd_lock);
/* Get FIFO information if there are lost vectors. */
if (fifo_info->total_lost) {
int fifo_info_length =
sizeof(struct ec_response_motion_sense_fifo_info) +
sizeof(u16) * sensorhub->sensor_num;
/* Need to retrieve the number of lost vectors per sensor */
sensorhub->params->cmd = MOTIONSENSE_CMD_FIFO_INFO;
sensorhub->msg->outsize = 1;
sensorhub->msg->insize = fifo_info_length;
if (cros_ec_cmd_xfer_status(ec->ec_dev, sensorhub->msg) < 0)
goto error;
memcpy(fifo_info, &sensorhub->resp->fifo_info,
fifo_info_length);
/*
* Update collection time, will not be as precise as the
* non-error case.
*/
fifo_timestamp = cros_ec_get_time_ns();
} else {
fifo_timestamp = sensorhub->fifo_timestamp[
CROS_EC_SENSOR_NEW_TS];
}
if (fifo_info->count > sensorhub->fifo_size ||
fifo_info->size != sensorhub->fifo_size) {
dev_warn(sensorhub->dev,
"Mismatch EC data: count %d, size %d - expected %d",
fifo_info->count, fifo_info->size,
sensorhub->fifo_size);
goto error;
}
/* Copy elements in the main fifo */
current_timestamp = sensorhub->fifo_timestamp[CROS_EC_SENSOR_LAST_TS];
out = sensorhub->ring;
for (i = 0; i < fifo_info->count; i += number_data) {
sensorhub->params->cmd = MOTIONSENSE_CMD_FIFO_READ;
sensorhub->params->fifo_read.max_data_vector =
fifo_info->count - i;
sensorhub->msg->outsize =
sizeof(struct ec_params_motion_sense);
sensorhub->msg->insize =
sizeof(sensorhub->resp->fifo_read) +
sensorhub->params->fifo_read.max_data_vector *
sizeof(struct ec_response_motion_sensor_data);
ret = cros_ec_cmd_xfer_status(ec->ec_dev, sensorhub->msg);
if (ret < 0) {
dev_warn(sensorhub->dev, "Fifo error: %d\n", ret);
break;
}
number_data = sensorhub->resp->fifo_read.number_data;
if (number_data == 0) {
dev_dbg(sensorhub->dev, "Unexpected empty FIFO\n");
break;
}
if (number_data > fifo_info->count - i) {
dev_warn(sensorhub->dev,
"Invalid EC data: too many entry received: %d, expected %d",
number_data, fifo_info->count - i);
break;
}
if (out + number_data >
sensorhub->ring + fifo_info->count) {
dev_warn(sensorhub->dev,
"Too many samples: %d (%zd data) to %d entries for expected %d entries",
i, out - sensorhub->ring, i + number_data,
fifo_info->count);
break;
}
for (in = sensorhub->resp->fifo_read.data, j = 0;
j < number_data; j++, in++) {
if (cros_ec_sensor_ring_process_event(
sensorhub, fifo_info,
fifo_timestamp,
&current_timestamp,
in, out))
out++;
}
}
mutex_unlock(&sensorhub->cmd_lock);
last_out = out;
if (out == sensorhub->ring)
/* Unexpected empty FIFO. */
goto ring_handler_end;
/*
* Check if current_timestamp is ahead of the last sample.
* Normally, the EC appends a timestamp after the last sample, but if
* the AP is slow to respond to the IRQ, the EC may have added new
* samples. Use the FIFO info timestamp as last timestamp then.
*/
if ((last_out - 1)->timestamp == current_timestamp)
current_timestamp = fifo_timestamp;
/* Warn on lost samples. */
if (fifo_info->total_lost)
for (i = 0; i < sensorhub->sensor_num; i++) {
if (fifo_info->lost[i])
dev_warn_ratelimited(sensorhub->dev,
"Sensor %d: lost: %d out of %d\n",
i, fifo_info->lost[i],
fifo_info->total_lost);
}
/* Push the event into the FIFO. */
for (out = sensorhub->ring; out < last_out; out++)
cros_sensorhub_send_sample(sensorhub, out);
ring_handler_end:
sensorhub->fifo_timestamp[CROS_EC_SENSOR_LAST_TS] = current_timestamp;
return;
error:
mutex_unlock(&sensorhub->cmd_lock);
}
static int cros_ec_sensorhub_event(struct notifier_block *nb,
unsigned long queued_during_suspend,
void *_notify)
{
struct cros_ec_sensorhub *sensorhub;
struct cros_ec_device *ec_dev;
sensorhub = container_of(nb, struct cros_ec_sensorhub, notifier);
ec_dev = sensorhub->ec->ec_dev;
if (ec_dev->event_data.event_type != EC_MKBP_EVENT_SENSOR_FIFO)
return NOTIFY_DONE;
if (ec_dev->event_size != sizeof(ec_dev->event_data.data.sensor_fifo)) {
dev_warn(ec_dev->dev, "Invalid fifo info size\n");
return NOTIFY_DONE;
}
if (queued_during_suspend)
return NOTIFY_OK;
memcpy(sensorhub->fifo_info, &ec_dev->event_data.data.sensor_fifo.info,
sizeof(*sensorhub->fifo_info));
sensorhub->fifo_timestamp[CROS_EC_SENSOR_NEW_TS] =
ec_dev->last_event_time;
cros_ec_sensorhub_ring_handler(sensorhub);
return NOTIFY_OK;
}
/**
* cros_ec_sensorhub_ring_add() - Add the FIFO functionality if the EC
* supports it.
*
* @sensorhub : Sensor Hub object.
*
* Return: 0 on success.
*/
int cros_ec_sensorhub_ring_add(struct cros_ec_sensorhub *sensorhub)
{
struct cros_ec_dev *ec = sensorhub->ec;
int ret;
int fifo_info_length =
sizeof(struct ec_response_motion_sense_fifo_info) +
sizeof(u16) * sensorhub->sensor_num;
/* Allocate the array for lost events. */
sensorhub->fifo_info = devm_kzalloc(sensorhub->dev, fifo_info_length,
GFP_KERNEL);
if (!sensorhub->fifo_info)
return -ENOMEM;
/* Retrieve FIFO information */
sensorhub->msg->version = 2;
sensorhub->params->cmd = MOTIONSENSE_CMD_FIFO_INFO;
sensorhub->msg->outsize = 1;
sensorhub->msg->insize = fifo_info_length;
ret = cros_ec_cmd_xfer_status(ec->ec_dev, sensorhub->msg);
if (ret < 0)
return ret;
/*
* Allocate the full fifo. We need to copy the whole FIFO to set
* timestamps properly.
*/
sensorhub->fifo_size = sensorhub->resp->fifo_info.size;
sensorhub->ring = devm_kcalloc(sensorhub->dev, sensorhub->fifo_size,
sizeof(*sensorhub->ring), GFP_KERNEL);
if (!sensorhub->ring)
return -ENOMEM;
/*
* Allocate the callback area based on the number of sensors.
*/
sensorhub->push_data = devm_kcalloc(
sensorhub->dev, sensorhub->sensor_num,
sizeof(*sensorhub->push_data),
GFP_KERNEL);
if (!sensorhub->push_data)
return -ENOMEM;
sensorhub->fifo_timestamp[CROS_EC_SENSOR_LAST_TS] =
cros_ec_get_time_ns();
/* Register the notifier that will act as a top half interrupt. */
sensorhub->notifier.notifier_call = cros_ec_sensorhub_event;
ret = blocking_notifier_chain_register(&ec->ec_dev->event_notifier,
&sensorhub->notifier);
if (ret < 0)
return ret;
/* Start collection samples. */
return cros_ec_sensorhub_ring_fifo_enable(sensorhub, true);
}
void cros_ec_sensorhub_ring_remove(void *arg)
{
struct cros_ec_sensorhub *sensorhub = arg;
struct cros_ec_device *ec_dev = sensorhub->ec->ec_dev;
/* Disable the ring, prevent EC interrupt to the AP for nothing. */
cros_ec_sensorhub_ring_fifo_enable(sensorhub, false);
blocking_notifier_chain_unregister(&ec_dev->event_notifier,
&sensorhub->notifier);
}

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 */