// SPDX-License-Identifier: GPL-2.0 /* * Sensor HUB driver that discovers sensors behind a ChromeOS Embedded * Controller. * * Copyright 2019 Google LLC */ #include #include #include #include #include #include #include #include #include #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 "); MODULE_DESCRIPTION("ChromeOS EC MEMS Sensor Hub Driver"); MODULE_LICENSE("GPL");