266 lines
6.6 KiB
C
266 lines
6.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Sensor HUB driver that discovers sensors behind a ChromeOS Embedded
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* Controller.
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*
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* Copyright 2019 Google LLC
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*/
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/platform_data/cros_ec_commands.h>
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#include <linux/platform_data/cros_ec_proto.h>
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#include <linux/platform_data/cros_ec_sensorhub.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#define DRV_NAME "cros-ec-sensorhub"
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static void cros_ec_sensorhub_free_sensor(void *arg)
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{
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struct platform_device *pdev = arg;
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platform_device_unregister(pdev);
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}
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static int cros_ec_sensorhub_allocate_sensor(struct device *parent,
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char *sensor_name,
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int sensor_num)
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{
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struct cros_ec_sensor_platform sensor_platforms = {
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.sensor_num = sensor_num,
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};
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struct platform_device *pdev;
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pdev = platform_device_register_data(parent, sensor_name,
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PLATFORM_DEVID_AUTO,
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&sensor_platforms,
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sizeof(sensor_platforms));
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if (IS_ERR(pdev))
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return PTR_ERR(pdev);
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return devm_add_action_or_reset(parent,
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cros_ec_sensorhub_free_sensor,
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pdev);
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}
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static int cros_ec_sensorhub_register(struct device *dev,
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struct cros_ec_sensorhub *sensorhub)
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{
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int sensor_type[MOTIONSENSE_TYPE_MAX] = { 0 };
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struct cros_ec_command *msg = sensorhub->msg;
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struct cros_ec_dev *ec = sensorhub->ec;
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int ret, i;
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char *name;
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msg->version = 1;
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msg->insize = sizeof(struct ec_response_motion_sense);
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msg->outsize = sizeof(struct ec_params_motion_sense);
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for (i = 0; i < sensorhub->sensor_num; i++) {
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sensorhub->params->cmd = MOTIONSENSE_CMD_INFO;
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sensorhub->params->info.sensor_num = i;
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ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
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if (ret < 0) {
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dev_warn(dev, "no info for EC sensor %d : %d/%d\n",
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i, ret, msg->result);
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continue;
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}
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switch (sensorhub->resp->info.type) {
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case MOTIONSENSE_TYPE_ACCEL:
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name = "cros-ec-accel";
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break;
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case MOTIONSENSE_TYPE_BARO:
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name = "cros-ec-baro";
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break;
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case MOTIONSENSE_TYPE_GYRO:
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name = "cros-ec-gyro";
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break;
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case MOTIONSENSE_TYPE_MAG:
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name = "cros-ec-mag";
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break;
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case MOTIONSENSE_TYPE_PROX:
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name = "cros-ec-prox";
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break;
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case MOTIONSENSE_TYPE_LIGHT:
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name = "cros-ec-light";
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break;
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case MOTIONSENSE_TYPE_ACTIVITY:
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name = "cros-ec-activity";
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break;
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default:
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dev_warn(dev, "unknown type %d\n",
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sensorhub->resp->info.type);
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continue;
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}
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ret = cros_ec_sensorhub_allocate_sensor(dev, name, i);
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if (ret)
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return ret;
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sensor_type[sensorhub->resp->info.type]++;
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}
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if (sensor_type[MOTIONSENSE_TYPE_ACCEL] >= 2)
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ec->has_kb_wake_angle = true;
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if (cros_ec_check_features(ec,
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EC_FEATURE_REFINED_TABLET_MODE_HYSTERESIS)) {
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ret = cros_ec_sensorhub_allocate_sensor(dev,
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"cros-ec-lid-angle",
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0);
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if (ret)
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return ret;
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}
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return 0;
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}
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static int cros_ec_sensorhub_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct cros_ec_dev *ec = dev_get_drvdata(dev->parent);
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struct cros_ec_sensorhub *data;
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struct cros_ec_command *msg;
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int ret, i, sensor_num;
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msg = devm_kzalloc(dev, sizeof(struct cros_ec_command) +
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max((u16)sizeof(struct ec_params_motion_sense),
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ec->ec_dev->max_response), GFP_KERNEL);
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if (!msg)
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return -ENOMEM;
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msg->command = EC_CMD_MOTION_SENSE_CMD + ec->cmd_offset;
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data = devm_kzalloc(dev, sizeof(struct cros_ec_sensorhub), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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mutex_init(&data->cmd_lock);
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data->dev = dev;
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data->ec = ec;
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data->msg = msg;
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data->params = (struct ec_params_motion_sense *)msg->data;
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data->resp = (struct ec_response_motion_sense *)msg->data;
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dev_set_drvdata(dev, data);
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/* Check whether this EC is a sensor hub. */
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if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE)) {
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sensor_num = cros_ec_get_sensor_count(ec);
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if (sensor_num < 0) {
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dev_err(dev,
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"Unable to retrieve sensor information (err:%d)\n",
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sensor_num);
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return sensor_num;
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}
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if (sensor_num == 0) {
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dev_err(dev, "Zero sensors reported.\n");
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return -EINVAL;
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}
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data->sensor_num = sensor_num;
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/*
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* Prepare the ring handler before enumering the
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* sensors.
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*/
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if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE_FIFO)) {
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ret = cros_ec_sensorhub_ring_allocate(data);
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if (ret)
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return ret;
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}
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/* Enumerate the sensors.*/
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ret = cros_ec_sensorhub_register(dev, data);
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if (ret)
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return ret;
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/*
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* When the EC does not have a FIFO, the sensors will query
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* their data themselves via sysfs or a software trigger.
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*/
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if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE_FIFO)) {
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ret = cros_ec_sensorhub_ring_add(data);
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if (ret)
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return ret;
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/*
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* The msg and its data is not under the control of the
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* ring handler.
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*/
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return devm_add_action_or_reset(dev,
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cros_ec_sensorhub_ring_remove,
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data);
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}
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} else {
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/*
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* If the device has sensors but does not claim to
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* be a sensor hub, we are in legacy mode.
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*/
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data->sensor_num = 2;
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for (i = 0; i < data->sensor_num; i++) {
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ret = cros_ec_sensorhub_allocate_sensor(dev,
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"cros-ec-accel-legacy", i);
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if (ret)
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return ret;
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}
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}
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return 0;
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}
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#ifdef CONFIG_PM_SLEEP
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/*
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* When the EC is suspending, we must stop sending interrupt,
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* we may use the same interrupt line for waking up the device.
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* Tell the EC to stop sending non-interrupt event on the iio ring.
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*/
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static int cros_ec_sensorhub_suspend(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct cros_ec_sensorhub *sensorhub = platform_get_drvdata(pdev);
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struct cros_ec_dev *ec = sensorhub->ec;
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if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE_FIFO))
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return cros_ec_sensorhub_ring_fifo_enable(sensorhub, false);
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return 0;
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}
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static int cros_ec_sensorhub_resume(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct cros_ec_sensorhub *sensorhub = platform_get_drvdata(pdev);
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struct cros_ec_dev *ec = sensorhub->ec;
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if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE_FIFO))
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return cros_ec_sensorhub_ring_fifo_enable(sensorhub, true);
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return 0;
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}
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#endif
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static SIMPLE_DEV_PM_OPS(cros_ec_sensorhub_pm_ops,
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cros_ec_sensorhub_suspend,
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cros_ec_sensorhub_resume);
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static struct platform_driver cros_ec_sensorhub_driver = {
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.driver = {
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.name = DRV_NAME,
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.pm = &cros_ec_sensorhub_pm_ops,
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},
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.probe = cros_ec_sensorhub_probe,
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};
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module_platform_driver(cros_ec_sensorhub_driver);
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MODULE_ALIAS("platform:" DRV_NAME);
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MODULE_AUTHOR("Gwendal Grignou <gwendal@chromium.org>");
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MODULE_DESCRIPTION("ChromeOS EC MEMS Sensor Hub Driver");
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MODULE_LICENSE("GPL");
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