| // 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/mod_devicetable.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 cros_ec_sensorhub *sensorhub = dev_get_drvdata(dev); |
| 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 cros_ec_sensorhub *sensorhub = dev_get_drvdata(dev); |
| 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 const struct platform_device_id cros_ec_sensorhub_id[] = { |
| { DRV_NAME, 0 }, |
| {} |
| }; |
| MODULE_DEVICE_TABLE(platform, cros_ec_sensorhub_id); |
| |
| static struct platform_driver cros_ec_sensorhub_driver = { |
| .driver = { |
| .name = DRV_NAME, |
| .pm = &cros_ec_sensorhub_pm_ops, |
| }, |
| .probe = cros_ec_sensorhub_probe, |
| .id_table = cros_ec_sensorhub_id, |
| }; |
| |
| module_platform_driver(cros_ec_sensorhub_driver); |
| |
| MODULE_AUTHOR("Gwendal Grignou <gwendal@chromium.org>"); |
| MODULE_DESCRIPTION("ChromeOS EC MEMS Sensor Hub Driver"); |
| MODULE_LICENSE("GPL"); |