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265 lines
6.6 KiB
265 lines
6.6 KiB
// 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 <[email protected]>"); |
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MODULE_DESCRIPTION("ChromeOS EC MEMS Sensor Hub Driver"); |
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MODULE_LICENSE("GPL");
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