Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0
/*
 * Sensor HUB driver that discovers sensors behind a ChromeOS Embedded
 * Controller.
 *
 * Copyright 2019 Google LLC
 */
 
#include <linux/init.h>
#include <linux/device.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/slab.h>
#include <linux/types.h>
 
#define DRV_NAME		"cros-ec-sensorhub"
 
static void cros_ec_sensorhub_free_sensor(void *arg)
{
<------>struct platform_device *pdev = arg;
 
<------>platform_device_unregister(pdev);
}
 
static int cros_ec_sensorhub_allocate_sensor(struct device *parent,
<------><------><------><------><------>     char *sensor_name,
<------><------><------><------><------>     int sensor_num)
{
<------>struct cros_ec_sensor_platform sensor_platforms = {
<------><------>.sensor_num = sensor_num,
<------>};
<------>struct platform_device *pdev;
 
<------>pdev = platform_device_register_data(parent, sensor_name,
<------><------><------><------><------>     PLATFORM_DEVID_AUTO,
<------><------><------><------><------>     &sensor_platforms,
<------><------><------><------><------>     sizeof(sensor_platforms));
<------>if (IS_ERR(pdev))
<------><------>return PTR_ERR(pdev);
 
<------>return devm_add_action_or_reset(parent,
<------><------><------><------><------>cros_ec_sensorhub_free_sensor,
<------><------><------><------><------>pdev);
}
 
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;
<------>int ret, i;
<------>char *name;
 
 
<------>msg->version = 1;
<------>msg->insize = sizeof(struct ec_response_motion_sense);
<------>msg->outsize = sizeof(struct ec_params_motion_sense);
 
<------>for (i = 0; i < sensorhub->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) {
<------><------><------>dev_warn(dev, "no info for EC sensor %d : %d/%d\n",
<------><------><------><------> i, ret, msg->result);
<------><------><------>continue;
<------><------>}
 
<------><------>switch (sensorhub->resp->info.type) {
<------><------>case MOTIONSENSE_TYPE_ACCEL:
<------><------><------>name = "cros-ec-accel";
<------><------><------>break;
<------><------>case MOTIONSENSE_TYPE_BARO:
<------><------><------>name = "cros-ec-baro";
<------><------><------>break;
<------><------>case MOTIONSENSE_TYPE_GYRO:
<------><------><------>name = "cros-ec-gyro";
<------><------><------>break;
<------><------>case MOTIONSENSE_TYPE_MAG:
<------><------><------>name = "cros-ec-mag";
<------><------><------>break;
<------><------>case MOTIONSENSE_TYPE_PROX:
<------><------><------>name = "cros-ec-prox";
<------><------><------>break;
<------><------>case MOTIONSENSE_TYPE_LIGHT:
<------><------><------>name = "cros-ec-light";
<------><------><------>break;
<------><------>case MOTIONSENSE_TYPE_ACTIVITY:
<------><------><------>name = "cros-ec-activity";
<------><------><------>break;
<------><------>default:
<------><------><------>dev_warn(dev, "unknown type %d\n",
<------><------><------><------> sensorhub->resp->info.type);
<------><------><------>continue;
<------><------>}
 
<------><------>ret = cros_ec_sensorhub_allocate_sensor(dev, name, i);
<------><------>if (ret)
<------><------><------>return ret;
 
<------><------>sensor_type[sensorhub->resp->info.type]++;
<------>}
 
<------>if (sensor_type[MOTIONSENSE_TYPE_ACCEL] >= 2)
<------><------>ec->has_kb_wake_angle = true;
 
<------>if (cros_ec_check_features(ec,
<------><------><------><------>   EC_FEATURE_REFINED_TABLET_MODE_HYSTERESIS)) {
<------><------>ret = cros_ec_sensorhub_allocate_sensor(dev,
<------><------><------><------><------><------><------>"cros-ec-lid-angle",
<------><------><------><------><------><------><------>0);
<------><------>if (ret)
<------><------><------>return ret;
<------>}
 
<------>return 0;
}
 
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, i, sensor_num;
 
<------>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;
 
<------>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. */
<------>if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE)) {
<------><------>sensor_num = cros_ec_get_sensor_count(ec);
<------><------>if (sensor_num < 0) {
<------><------><------>dev_err(dev,
<------><------><------><------>"Unable to retrieve sensor information (err:%d)\n",
<------><------><------><------>sensor_num);
<------><------><------>return sensor_num;
<------><------>}
<------><------>if (sensor_num == 0) {
<------><------><------>dev_err(dev, "Zero sensors reported.\n");
<------><------><------>return -EINVAL;
<------><------>}
<------><------>data->sensor_num = sensor_num;
 
<------><------>/*
<------><------> * Prepare the ring handler before enumering the
<------><------> * sensors.
<------><------> */
<------><------>if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE_FIFO)) {
<------><------><------>ret = cros_ec_sensorhub_ring_allocate(data);
<------><------><------>if (ret)
<------><------><------><------>return ret;
<------><------>}
 
<------><------>/* Enumerate the sensors.*/
<------><------>ret = cros_ec_sensorhub_register(dev, data);
<------><------>if (ret)
<------><------><------>return ret;
 
<------><------>/*
<------><------> * When 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);
<------><------>}
 
<------>} else {
<------><------>/*
<------><------> * If the device has sensors but does not claim to
<------><------> * be a sensor hub, we are in legacy mode.
<------><------> */
<------><------>data->sensor_num = 2;
<------><------>for (i = 0; i < data->sensor_num; i++) {
<------><------><------>ret = cros_ec_sensorhub_allocate_sensor(dev,
<------><------><------><------><------><------>"cros-ec-accel-legacy", i);
<------><------><------>if (ret)
<------><------><------><------>return ret;
<------><------>}
<------>}
 
 
<------>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,
};
 
module_platform_driver(cros_ec_sensorhub_driver);
 
MODULE_ALIAS("platform:" DRV_NAME);
MODULE_AUTHOR("Gwendal Grignou <gwendal@chromium.org>");
MODULE_DESCRIPTION("ChromeOS EC MEMS Sensor Hub Driver");
MODULE_LICENSE("GPL");