[PATCH 02/13] platform: cros_ec: Add cros_ec_sensor_hub driver

Gwendal Grignou
2019-09-22T17:51:13Z

Similar to HID sensor stack, the new driver sits between cros_ec_dev
and the iio device drivers:

EC based iio device topology would be:
iio:device1 ->
...0/0000:00:1f.0/PNP0C09:00/GOOG0004:00/cros-ec-dev.6.auto/
cros-ec-sensorhub.7.auto/
cros-ec-accel.15.auto/
iio:device1

It will be expanded to control EC sensor FIFO.

Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
---
drivers/iio/common/cros_ec_sensors/Kconfig | 2 +-
drivers/platform/chrome/Kconfig | 18 +-
drivers/platform/chrome/Makefile | 1 +
drivers/platform/chrome/cros_ec_sensorhub.c | 211 ++++++++++++++++++
.../linux/platform_data/cros_ec_sensorhub.h | 21 ++
5 files changed, 249 insertions(+), 4 deletions(-)
create mode 100644 drivers/platform/chrome/cros_ec_sensorhub.c
create mode 100644 include/linux/platform_data/cros_ec_sensorhub.h

diff --git a/drivers/iio/common/cros_ec_sensors/Kconfig b/drivers/iio/common/cros_ec_sensors/Kconfig
index cdbb29cfb907..fefad9572790 100644
--- a/drivers/iio/common/cros_ec_sensors/Kconfig
+++ b/drivers/iio/common/cros_ec_sensors/Kconfig
@@ -4,7 +4,7 @@
#
config IIO_CROS_EC_SENSORS_CORE
tristate "ChromeOS EC Sensors Core"
- depends on SYSFS && CROS_EC
+ depends on SYSFS && CROS_EC_SENSORHUB
select IIO_BUFFER
select IIO_TRIGGERED_BUFFER
help
diff --git a/drivers/platform/chrome/Kconfig b/drivers/platform/chrome/Kconfig
index ee5f08ea57b6..add967236cfb 100644
--- a/drivers/platform/chrome/Kconfig
+++ b/drivers/platform/chrome/Kconfig
@@ -132,9 +132,9 @@ config CROS_EC_LPC
module will be called cros_ec_lpcs.

config CROS_EC_PROTO
- bool
- help
- ChromeOS EC communication protocol helpers.
+ bool
+ help
+ ChromeOS EC communication protocol helpers.

config CROS_KBD_LED_BACKLIGHT
tristate "Backlight LED support for Chrome OS keyboards"
@@ -190,6 +190,18 @@ config CROS_EC_DEBUGFS
To compile this driver as a module, choose M here: the
module will be called cros_ec_debugfs.

+config CROS_EC_SENSORHUB
+ tristate "ChromeOS EC MEMS Senosr Hub"
+ depends on CROS_EC && IIO
+ help
+ Allow loading IIO sensors. This driver is loaded by MFD and will in
+ turn query the EC and register the sensors.
+ It also spreads the sensor data coming from the EC to the IIO sensorr
+ object.
+
+ To compile this driver as a module, choose M here: the
+ module will be called cros_ec_sensorhub.
+
config CROS_EC_SYSFS
tristate "ChromeOS EC control and information through sysfs"
depends on MFD_CROS_EC_DEV && SYSFS
diff --git a/drivers/platform/chrome/Makefile b/drivers/platform/chrome/Makefile
index 477ec3d1d1c9..a164c40dc099 100644
--- a/drivers/platform/chrome/Makefile
+++ b/drivers/platform/chrome/Makefile
@@ -17,6 +17,7 @@ obj-$(CONFIG_CROS_EC_PROTO) += cros_ec_proto.o cros_ec_trace.o
obj-$(CONFIG_CROS_KBD_LED_BACKLIGHT) += cros_kbd_led_backlight.o
obj-$(CONFIG_CROS_EC_CHARDEV) += cros_ec_chardev.o
obj-$(CONFIG_CROS_EC_LIGHTBAR) += cros_ec_lightbar.o
+obj-$(CONFIG_CROS_EC_SENSORHUB) += cros_ec_sensorhub.o
obj-$(CONFIG_CROS_EC_VBC) += cros_ec_vbc.o
obj-$(CONFIG_CROS_EC_DEBUGFS) += cros_ec_debugfs.o
obj-$(CONFIG_CROS_EC_SYSFS) += cros_ec_sysfs.o
diff --git a/drivers/platform/chrome/cros_ec_sensorhub.c b/drivers/platform/chrome/cros_ec_sensorhub.c
new file mode 100644
index 000000000000..80688018ef66
--- /dev/null
+++ b/drivers/platform/chrome/cros_ec_sensorhub.c
@@ -0,0 +1,211 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * SensorHub: driver that discover sensors behind
+ * a ChromeOS Embedded controller.
+ *
+ * Copyright 2019 Google LLC
+ */
+
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/fs.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/cros_ec.h>
+#include <linux/platform_data/cros_ec_commands.h>
+#include <linux/platform_data/cros_ec_proto.h>
+#include <linux/platform_device.h>
+#include <linux/poll.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/uaccess.h>
+
+#include <linux/platform_data/cros_ec_sensorhub.h>
+
+#define DRV_NAME "cros-ec-sensorhub"
+
+static int cros_ec_sensors_register(struct device *dev,
+ struct cros_ec_dev *ec)
+{
+ int ret, i, id, sensor_num;
+ struct mfd_cell *sensor_cells;
+ struct cros_ec_sensor_platform *sensor_platforms;
+ int sensor_type[MOTIONSENSE_TYPE_MAX] = { 0 };
+ struct ec_params_motion_sense *params;
+ struct ec_response_motion_sense *resp;
+ struct cros_ec_command *msg;
+
+ 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;
+ }
+
+ /*
+ * Build an array of sensors driver and register them all.
+ */
+ msg = kzalloc(sizeof(struct cros_ec_command) +
+ max(sizeof(*params), sizeof(*resp)), GFP_KERNEL);
+ if (msg == NULL) {
+ ret = -ENOMEM;
+ goto error;
+ }
+
+ msg->version = 1;
+ msg->command = EC_CMD_MOTION_SENSE_CMD + ec->cmd_offset;
+ msg->outsize = sizeof(*params);
+ msg->insize = sizeof(*resp);
+ params = (struct ec_params_motion_sense *)msg->data;
+ resp = (struct ec_response_motion_sense *)msg->data;
+
+ /*
+ * Allocate 1 extra sensor if lid angle sensor is needed.
+ */
+ sensor_cells = kcalloc(sensor_num + 1, sizeof(struct mfd_cell),
+ GFP_KERNEL);
+ if (sensor_cells == NULL) {
+ ret = -ENOMEM;
+ goto error;
+ }
+
+ sensor_platforms = kcalloc(sensor_num,
+ sizeof(struct cros_ec_sensor_platform),
+ GFP_KERNEL);
+ if (sensor_platforms == NULL) {
+ ret = -ENOMEM;
+ goto error_platforms;
+ }
+
+ id = 0;
+ for (i = 0; i < sensor_num; i++) {
+ params->cmd = MOTIONSENSE_CMD_INFO;
+ 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 (resp->info.type) {
+ case MOTIONSENSE_TYPE_ACCEL:
+ sensor_cells[id].name = "cros-ec-accel";
+ break;
+ case MOTIONSENSE_TYPE_BARO:
+ sensor_cells[id].name = "cros-ec-baro";
+ break;
+ case MOTIONSENSE_TYPE_GYRO:
+ sensor_cells[id].name = "cros-ec-gyro";
+ break;
+ case MOTIONSENSE_TYPE_MAG:
+ sensor_cells[id].name = "cros-ec-mag";
+ break;
+ case MOTIONSENSE_TYPE_PROX:
+ sensor_cells[id].name = "cros-ec-prox";
+ break;
+ case MOTIONSENSE_TYPE_LIGHT:
+ sensor_cells[id].name = "cros-ec-light";
+ break;
+ case MOTIONSENSE_TYPE_ACTIVITY:
+ sensor_cells[id].name = "cros-ec-activity";
+ break;
+ default:
+ dev_warn(dev, "unknown type %d\n", resp->info.type);
+ continue;
+ }
+ sensor_platforms[id].sensor_num = i;
+ sensor_cells[id].platform_data = &sensor_platforms[id];
+ sensor_cells[id].pdata_size =
+ sizeof(struct cros_ec_sensor_platform);
+
+ sensor_type[resp->info.type]++;
+ id++;
+ }
+
+ 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)) {
+ sensor_cells[id].name = "cros-ec-lid-angle";
+ id++;
+ }
+
+ ret = mfd_add_hotplug_devices(dev, sensor_cells, id);
+ kfree(sensor_platforms);
+error_platforms:
+ kfree(sensor_cells);
+error:
+ kfree(msg);
+ return ret;
+}
+
+static struct cros_ec_sensor_platform sensor_platforms[] = {
+ { .sensor_num = 0 },
+ { .sensor_num = 1 }
+};
+
+static const struct mfd_cell cros_ec_accel_legacy_cells[] = {
+ {
+ .name = "cros-ec-accel-legacy",
+ .platform_data = &sensor_platforms[0],
+ .pdata_size = sizeof(struct cros_ec_sensor_platform),
+ },
+ {
+ .name = "cros-ec-accel-legacy",
+ .platform_data = &sensor_platforms[1],
+ .pdata_size = sizeof(struct cros_ec_sensor_platform),
+ }
+};
+
+
+
+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);
+ int ret;
+ struct cros_ec_sensorhub *data =
+ kzalloc(sizeof(struct cros_ec_sensorhub), GFP_KERNEL);
+
+ if (!data)
+ return -ENOMEM;
+
+ data->ec = ec;
+ dev_set_drvdata(dev, data);
+
+ /* check whether this EC is a sensor hub. */
+ if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE)) {
+ ret = cros_ec_sensors_register(dev, ec);
+ } else {
+ /* Workaroud for older EC firmware */
+ ret = mfd_add_hotplug_devices(dev,
+ cros_ec_accel_legacy_cells,
+ ARRAY_SIZE(cros_ec_accel_legacy_cells));
+ }
+ if (ret)
+ dev_err(dev, "failed to add EC sensors: error %d\n", ret);
+ return ret;
+}
+
+static struct platform_driver cros_ec_sensorhub_driver = {
+ .driver = {
+ .name = DRV_NAME,
+ },
+ .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");
+
diff --git a/include/linux/platform_data/cros_ec_sensorhub.h b/include/linux/platform_data/cros_ec_sensorhub.h
new file mode 100644
index 000000000000..a8b64ecf5b9b
--- /dev/null
+++ b/include/linux/platform_data/cros_ec_sensorhub.h
@@ -0,0 +1,21 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * cros_ec_sensorhub- Chrome OS EC MEMS Sensor Hub driver.
+ *
+ * Copyright (C) 2019 Google, Inc
+ *
+ */
+
+#ifndef __LINUX_PLATFORM_DATA_CROS_EC_SENSORHUB_H
+#define __LINUX_PLATFORM_DATA_CROS_EC_SENSORHUB_H
+
+#include <linux/platform_data/cros_ec_commands.h>
+
+/**
+ * struct cros_ec_sensorhub - Sensor Hub device data.
+ */
+struct cros_ec_sensorhub {
+ struct cros_ec_dev *ec;
+};
+
+#endif /* __LINUX_PLATFORM_DATA_CROS_EC_SENSORHUB_H */
--
2.23.0.351.gc4317032e6-goog