Merge tag 'tag-chrome-platform-for-v5.7' of git://git.kernel.org/pub/scm/linux/kernel/git/chrome-platform/linux

Pull chrome platform updates from Benson Leung:

  cros-usbpd-notify and cros_ec_typec:
   - Add a new notification driver that handles and dispatches USB PD
     related events to other drivers.
   - Add a Type C connector class driver for cros_ec

  CrOS EC:
   - Introduce a new cros_ec_cmd_xfer_status helper

  Sensors/iio:
   - A series from Gwendal that adds Cros EC sensor hub FIFO support

  Wilco EC:
   - Fix a build warning.
   - Platform data shouldn't include kernel.h

  Misc:
   - i2c api conversion complete, with i2c_new_client_device instead of
     i2c_new_device in chromeos_laptop.
   - Replace zero-length array with flexible-array member in
     cros_ec_chardev and wilco_ec
   - Update new structure for SPI transfer delays in cros_ec_spi

* tag 'tag-chrome-platform-for-v5.7' of git://git.kernel.org/pub/scm/linux/kernel/git/chrome-platform/linux: (34 commits)
  platform/chrome: cros_ec_spi: Wait for USECS, not NSECS
  iio: cros_ec: Use Hertz as unit for sampling frequency
  iio: cros_ec: Report hwfifo_watermark_max
  iio: cros_ec: Expose hwfifo_timeout
  iio: cros_ec: Remove pm function
  iio: cros_ec: Register to cros_ec_sensorhub when EC supports FIFO
  iio: expose iio_device_set_clock
  iio: cros_ec: Move function description to .c file
  platform/chrome: cros_ec_sensorhub: Add median filter
  platform/chrome: cros_ec_sensorhub: Add code to spread timestmap
  platform/chrome: cros_ec_sensorhub: Add FIFO support
  platform/chrome: cros_ec_sensorhub: Add the number of sensors in sensorhub
  platform/chrome: chromeos_laptop: make I2C API conversion complete
  platform/chrome: wilco_ec: event: Replace zero-length array with flexible-array member
  platform/chrome: cros_ec_chardev: Replace zero-length array with flexible-array member
  platform/chrome: cros_ec_typec: Update port info from EC
  platform/chrome: Add Type C connector class driver
  platform/chrome: cros_usbpd_notify: Pull PD_HOST_EVENT status
  platform/chrome: cros_usbpd_notify: Amend ACPI driver to plat
  platform/chrome: cros_usbpd_notify: Add driver data struct
  ...

18 files changed, 1925 insertions, 97 deletions

diff --git a/drivers/platform/chrome/Kconfig b/drivers/platform/chrome/Kconfig
index 5f57282a28da..03ea5129ed0c 100644
--- a/drivers/platform/chrome/Kconfig
+++ b/drivers/platform/chrome/Kconfig
@@ -7,7 +7,7 @@ config MFD_CROS_EC
 	tristate "Platform support for Chrome hardware (transitional)"
 	select CHROME_PLATFORMS
 	select CROS_EC
-	select CONFIG_MFD_CROS_EC_DEV
+	select MFD_CROS_EC_DEV
 	depends on X86 || ARM || ARM64 || COMPILE_TEST
 	help
 	  This is a transitional Kconfig option and will be removed after
@@ -214,6 +214,17 @@ config CROS_EC_SYSFS
 	  To compile this driver as a module, choose M here: the
 	  module will be called cros_ec_sysfs.
 
+config CROS_EC_TYPEC
+	tristate "ChromeOS EC Type-C Connector Control"
+	depends on MFD_CROS_EC_DEV && TYPEC
+	default MFD_CROS_EC_DEV
+	help
+	  If you say Y here, you get support for accessing Type C connector
+	  information from the Chrome OS EC.
+
+	  To compile this driver as a module, choose M here: the module will be
+	  called cros_ec_typec.
+
 config CROS_USBPD_LOGGER
 	tristate "Logging driver for USB PD charger"
 	depends on CHARGER_CROS_USBPD
@@ -226,6 +237,20 @@ config CROS_USBPD_LOGGER
 	  To compile this driver as a module, choose M here: the
 	  module will be called cros_usbpd_logger.
 
+config CROS_USBPD_NOTIFY
+	tristate "ChromeOS Type-C power delivery event notifier"
+	depends on MFD_CROS_EC_DEV
+	default MFD_CROS_EC_DEV
+	help
+	  If you say Y here, you get support for Type-C PD event notifications
+	  from the ChromeOS EC. On ACPI platorms this driver will bind to the
+	  GOOG0003 ACPI device, and on platforms which don't have this device it
+	  will get initialized on ECs which support the feature
+	  EC_FEATURE_USB_PD.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called cros_usbpd_notify.
+
 source "drivers/platform/chrome/wilco_ec/Kconfig"
 
 endif # CHROMEOS_PLATFORMS
diff --git a/drivers/platform/chrome/Makefile b/drivers/platform/chrome/Makefile
index aacd5920d8a1..41baccba033f 100644
--- a/drivers/platform/chrome/Makefile
+++ b/drivers/platform/chrome/Makefile
@@ -12,6 +12,7 @@ obj-$(CONFIG_CROS_EC_ISHTP)		+= cros_ec_ishtp.o
 obj-$(CONFIG_CROS_EC_RPMSG)		+= cros_ec_rpmsg.o
 obj-$(CONFIG_CROS_EC_SPI)		+= cros_ec_spi.o
 cros_ec_lpcs-objs			:= cros_ec_lpc.o cros_ec_lpc_mec.o
+obj-$(CONFIG_CROS_EC_TYPEC)		+= cros_ec_typec.o
 obj-$(CONFIG_CROS_EC_LPC)		+= cros_ec_lpcs.o
 obj-$(CONFIG_CROS_EC_PROTO)		+= cros_ec_proto.o cros_ec_trace.o
 obj-$(CONFIG_CROS_KBD_LED_BACKLIGHT)	+= cros_kbd_led_backlight.o
@@ -19,8 +20,10 @@ obj-$(CONFIG_CROS_EC_CHARDEV)		+= cros_ec_chardev.o
 obj-$(CONFIG_CROS_EC_LIGHTBAR)		+= cros_ec_lightbar.o
 obj-$(CONFIG_CROS_EC_VBC)		+= cros_ec_vbc.o
 obj-$(CONFIG_CROS_EC_DEBUGFS)		+= cros_ec_debugfs.o
-obj-$(CONFIG_CROS_EC_SENSORHUB)		+= cros_ec_sensorhub.o
+cros-ec-sensorhub-objs			:= cros_ec_sensorhub.o cros_ec_sensorhub_ring.o
+obj-$(CONFIG_CROS_EC_SENSORHUB)		+= cros-ec-sensorhub.o
 obj-$(CONFIG_CROS_EC_SYSFS)		+= cros_ec_sysfs.o
 obj-$(CONFIG_CROS_USBPD_LOGGER)		+= cros_usbpd_logger.o
+obj-$(CONFIG_CROS_USBPD_NOTIFY)		+= cros_usbpd_notify.o
 
 obj-$(CONFIG_WILCO_EC)			+= wilco_ec/
diff --git a/drivers/platform/chrome/chromeos_laptop.c b/drivers/platform/chrome/chromeos_laptop.c
index 4f3651fcd9fe..472a03daa869 100644
--- a/drivers/platform/chrome/chromeos_laptop.c
+++ b/drivers/platform/chrome/chromeos_laptop.c
@@ -103,7 +103,7 @@ chromes_laptop_instantiate_i2c_device(struct i2c_adapter *adapter,
 			pr_debug("%d-%02x is probed at %02x\n",
 				 adapter->nr, info->addr, dummy->addr);
 			i2c_unregister_device(dummy);
-			client = i2c_new_device(adapter, info);
+			client = i2c_new_client_device(adapter, info);
 		}
 	}
 
diff --git a/drivers/platform/chrome/cros_ec.c b/drivers/platform/chrome/cros_ec.c
index 6fc8f2c3ac51..3104680b7485 100644
--- a/drivers/platform/chrome/cros_ec.c
+++ b/drivers/platform/chrome/cros_ec.c
@@ -120,7 +120,7 @@ static int cros_ec_sleep_event(struct cros_ec_device *ec_dev, u8 sleep_event)
 
 	buf.msg.command = EC_CMD_HOST_SLEEP_EVENT;
 
-	ret = cros_ec_cmd_xfer(ec_dev, &buf.msg);
+	ret = cros_ec_cmd_xfer_status(ec_dev, &buf.msg);
 
 	/* For now, report failure to transition to S0ix with a warning. */
 	if (ret >= 0 && ec_dev->host_sleep_v1 &&
@@ -138,6 +138,24 @@ static int cros_ec_sleep_event(struct cros_ec_device *ec_dev, u8 sleep_event)
 	return ret;
 }
 
+static int cros_ec_ready_event(struct notifier_block *nb,
+			       unsigned long queued_during_suspend,
+			       void *_notify)
+{
+	struct cros_ec_device *ec_dev = container_of(nb, struct cros_ec_device,
+						     notifier_ready);
+	u32 host_event = cros_ec_get_host_event(ec_dev);
+
+	if (host_event & EC_HOST_EVENT_MASK(EC_HOST_EVENT_INTERFACE_READY)) {
+		mutex_lock(&ec_dev->lock);
+		cros_ec_query_all(ec_dev);
+		mutex_unlock(&ec_dev->lock);
+		return NOTIFY_OK;
+	}
+
+	return NOTIFY_DONE;
+}
+
 /**
  * cros_ec_register() - Register a new ChromeOS EC, using the provided info.
  * @ec_dev: Device to register.
@@ -237,6 +255,18 @@ int cros_ec_register(struct cros_ec_device *ec_dev)
 		dev_dbg(ec_dev->dev, "Error %d clearing sleep event to ec",
 			err);
 
+	if (ec_dev->mkbp_event_supported) {
+		/*
+		 * Register the notifier for EC_HOST_EVENT_INTERFACE_READY
+		 * event.
+		 */
+		ec_dev->notifier_ready.notifier_call = cros_ec_ready_event;
+		err = blocking_notifier_chain_register(&ec_dev->event_notifier,
+						      &ec_dev->notifier_ready);
+		if (err)
+			return err;
+	}
+
 	dev_info(dev, "Chrome EC device registered\n");
 
 	return 0;
diff --git a/drivers/platform/chrome/cros_ec_chardev.c b/drivers/platform/chrome/cros_ec_chardev.c
index c65e70bc168d..e0bce869c49a 100644
--- a/drivers/platform/chrome/cros_ec_chardev.c
+++ b/drivers/platform/chrome/cros_ec_chardev.c
@@ -48,7 +48,7 @@ struct ec_event {
 	struct list_head node;
 	size_t size;
 	u8 event_type;
-	u8 data[0];
+	u8 data[];
 };
 
 static int ec_get_version(struct cros_ec_dev *ec, char *str, int maxlen)
@@ -301,7 +301,7 @@ static long cros_ec_chardev_ioctl_xcmd(struct cros_ec_dev *ec, void __user *arg)
 	}
 
 	s_cmd->command += ec->cmd_offset;
-	ret = cros_ec_cmd_xfer(ec->ec_dev, s_cmd);
+	ret = cros_ec_cmd_xfer_status(ec->ec_dev, s_cmd);
 	/* Only copy data to userland if data was received. */
 	if (ret < 0)
 		goto exit;
diff --git a/drivers/platform/chrome/cros_ec_lightbar.c b/drivers/platform/chrome/cros_ec_lightbar.c
index b4c110c5fee0..b59180bff5a3 100644
--- a/drivers/platform/chrome/cros_ec_lightbar.c
+++ b/drivers/platform/chrome/cros_ec_lightbar.c
@@ -116,7 +116,7 @@ static int get_lightbar_version(struct cros_ec_dev *ec,
 
 	param = (struct ec_params_lightbar *)msg->data;
 	param->cmd = LIGHTBAR_CMD_VERSION;
-	ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
+	ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
 	if (ret < 0) {
 		ret = 0;
 		goto exit;
@@ -193,15 +193,10 @@ static ssize_t brightness_store(struct device *dev,
 	if (ret)
 		goto exit;
 
-	ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
+	ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
 	if (ret < 0)
 		goto exit;
 
-	if (msg->result != EC_RES_SUCCESS) {
-		ret = -EINVAL;
-		goto exit;
-	}
-
 	ret = count;
 exit:
 	kfree(msg);
@@ -258,13 +253,10 @@ static ssize_t led_rgb_store(struct device *dev, struct device_attribute *attr,
 					goto exit;
 			}
 
-			ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
+			ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
 			if (ret < 0)
 				goto exit;
 
-			if (msg->result != EC_RES_SUCCESS)
-				goto exit;
-
 			i = 0;
 			ok = 1;
 		}
@@ -305,14 +297,13 @@ static ssize_t sequence_show(struct device *dev,
 	if (ret)
 		goto exit;
 
-	ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
-	if (ret < 0)
-		goto exit;
-
-	if (msg->result != EC_RES_SUCCESS) {
+	ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
+	if (ret == -EPROTO) {
 		ret = scnprintf(buf, PAGE_SIZE,
 				"ERROR: EC returned %d\n", msg->result);
 		goto exit;
+	} else if (ret < 0) {
+		goto exit;
 	}
 
 	resp = (struct ec_response_lightbar *)msg->data;
@@ -344,13 +335,10 @@ static int lb_send_empty_cmd(struct cros_ec_dev *ec, uint8_t cmd)
 	if (ret)
 		goto error;
 
-	ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
+	ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
 	if (ret < 0)
 		goto error;
-	if (msg->result != EC_RES_SUCCESS) {
-		ret = -EINVAL;
-		goto error;
-	}
+
 	ret = 0;
 error:
 	kfree(msg);
@@ -377,13 +365,10 @@ static int lb_manual_suspend_ctrl(struct cros_ec_dev *ec, uint8_t enable)
 	if (ret)
 		goto error;
 
-	ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
+	ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
 	if (ret < 0)
 		goto error;
-	if (msg->result != EC_RES_SUCCESS) {
-		ret = -EINVAL;
-		goto error;
-	}
+
 	ret = 0;
 error:
 	kfree(msg);
@@ -425,15 +410,10 @@ static ssize_t sequence_store(struct device *dev, struct device_attribute *attr,
 	if (ret)
 		goto exit;
 
-	ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
+	ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
 	if (ret < 0)
 		goto exit;
 
-	if (msg->result != EC_RES_SUCCESS) {
-		ret = -EINVAL;
-		goto exit;
-	}
-
 	ret = count;
 exit:
 	kfree(msg);
@@ -487,13 +467,9 @@ static ssize_t program_store(struct device *dev, struct device_attribute *attr,
 	 */
 	msg->outsize = count + extra_bytes;
 
-	ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
+	ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
 	if (ret < 0)
 		goto exit;
-	if (msg->result != EC_RES_SUCCESS) {
-		ret = -EINVAL;
-		goto exit;
-	}
 
 	ret = count;
 exit:
diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c
index 3cfa643f1d07..3e745e0fe092 100644
--- a/drivers/platform/chrome/cros_ec_proto.c
+++ b/drivers/platform/chrome/cros_ec_proto.c
@@ -553,7 +553,10 @@ EXPORT_SYMBOL(cros_ec_cmd_xfer);
  * replied with success status. It's not necessary to check msg->result when
  * using this function.
  *
- * Return: The number of bytes transferred on success or negative error code.
+ * Return:
+ * >=0 - The number of bytes transferred
+ * -ENOTSUPP - Operation not supported
+ * -EPROTO - Protocol error
  */
 int cros_ec_cmd_xfer_status(struct cros_ec_device *ec_dev,
 			    struct cros_ec_command *msg)
@@ -563,6 +566,10 @@ int cros_ec_cmd_xfer_status(struct cros_ec_device *ec_dev,
 	ret = cros_ec_cmd_xfer(ec_dev, msg);
 	if (ret < 0) {
 		dev_err(ec_dev->dev, "Command xfer error (err:%d)\n", ret);
+	} else if (msg->result == EC_RES_INVALID_VERSION) {
+		dev_dbg(ec_dev->dev, "Command invalid version (err:%d)\n",
+			msg->result);
+		return -ENOTSUPP;
 	} else if (msg->result != EC_RES_SUCCESS) {
 		dev_dbg(ec_dev->dev, "Command result (err: %d)\n", msg->result);
 		return -EPROTO;
diff --git a/drivers/platform/chrome/cros_ec_rpmsg.c b/drivers/platform/chrome/cros_ec_rpmsg.c
index dbc3f5523b83..7e8629e3db74 100644
--- a/drivers/platform/chrome/cros_ec_rpmsg.c
+++ b/drivers/platform/chrome/cros_ec_rpmsg.c
@@ -44,6 +44,8 @@ struct cros_ec_rpmsg {
 	struct completion xfer_ack;
 	struct work_struct host_event_work;
 	struct rpmsg_endpoint *ept;
+	bool has_pending_host_event;
+	bool probe_done;
 };
 
 /**
@@ -177,7 +179,14 @@ static int cros_ec_rpmsg_callback(struct rpmsg_device *rpdev, void *data,
 		memcpy(ec_dev->din, resp->data, len);
 		complete(&ec_rpmsg->xfer_ack);
 	} else if (resp->type == HOST_EVENT_MARK) {
-		schedule_work(&ec_rpmsg->host_event_work);
+		/*
+		 * If the host event is sent before cros_ec_register is
+		 * finished, queue the host event.
+		 */
+		if (ec_rpmsg->probe_done)
+			schedule_work(&ec_rpmsg->host_event_work);
+		else
+			ec_rpmsg->has_pending_host_event = true;
 	} else {
 		dev_warn(ec_dev->dev, "rpmsg received invalid type = %d",
 			 resp->type);
@@ -240,6 +249,11 @@ static int cros_ec_rpmsg_probe(struct rpmsg_device *rpdev)
 		return ret;
 	}
 
+	ec_rpmsg->probe_done = true;
+
+	if (ec_rpmsg->has_pending_host_event)
+		schedule_work(&ec_rpmsg->host_event_work);
+
 	return 0;
 }
 
diff --git a/drivers/platform/chrome/cros_ec_sensorhub.c b/drivers/platform/chrome/cros_ec_sensorhub.c
index 79fefd3bb0fa..b7f2c00db5e1 100644
--- a/drivers/platform/chrome/cros_ec_sensorhub.c
+++ b/drivers/platform/chrome/cros_ec_sensorhub.c
@@ -50,10 +50,8 @@ 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;
-	struct ec_params_motion_sense *params;
-	struct ec_response_motion_sense *resp;
-	struct cros_ec_command *msg;
 	int ret, i, sensor_num;
 	char *name;
 
@@ -65,27 +63,19 @@ static int cros_ec_sensorhub_register(struct device *dev,
 		return sensor_num;
 	}
 
+	sensorhub->sensor_num = sensor_num;
 	if (sensor_num == 0) {
 		dev_err(dev, "Zero sensors reported.\n");
 		return -EINVAL;
 	}
 
-	/* Prepare a message to send INFO command to each sensor. */
-	msg = kzalloc(sizeof(*msg) + max(sizeof(*params), sizeof(*resp)),
-		      GFP_KERNEL);
-	if (!msg)
-		return -ENOMEM;
-
 	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;
+	msg->insize = sizeof(struct ec_response_motion_sense);
+	msg->outsize = sizeof(struct ec_params_motion_sense);
 
 	for (i = 0; i < sensor_num; i++) {
-		params->cmd = MOTIONSENSE_CMD_INFO;
-		params->info.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) {
@@ -94,7 +84,7 @@ static int cros_ec_sensorhub_register(struct device *dev,
 			continue;
 		}
 
-		switch (resp->info.type) {
+		switch (sensorhub->resp->info.type) {
 		case MOTIONSENSE_TYPE_ACCEL:
 			name = "cros-ec-accel";
 			break;
@@ -117,15 +107,16 @@ static int cros_ec_sensorhub_register(struct device *dev,
 			name = "cros-ec-activity";
 			break;
 		default:
-			dev_warn(dev, "unknown type %d\n", resp->info.type);
+			dev_warn(dev, "unknown type %d\n",
+				 sensorhub->resp->info.type);
 			continue;
 		}
 
 		ret = cros_ec_sensorhub_allocate_sensor(dev, name, i);
 		if (ret)
-			goto error;
+			return ret;
 
-		sensor_type[resp->info.type]++;
+		sensor_type[sensorhub->resp->info.type]++;
 	}
 
 	if (sensor_type[MOTIONSENSE_TYPE_ACCEL] >= 2)
@@ -137,29 +128,41 @@ static int cros_ec_sensorhub_register(struct device *dev,
 							"cros-ec-lid-angle",
 							0);
 		if (ret)
-			goto error;
+			return ret;
 	}
 
-	kfree(msg);
 	return 0;
-
-error:
-	kfree(msg);
-	return ret;
 }
 
 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;
 	int i;
 
+	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;
 
-	data->ec = dev_get_drvdata(dev->parent);
+	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. */
@@ -172,7 +175,8 @@ static int cros_ec_sensorhub_probe(struct platform_device *pdev)
 		 * If the device has sensors but does not claim to
 		 * be a sensor hub, we are in legacy mode.
 		 */
-		for (i = 0; i < 2; i++) {
+		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)
@@ -180,12 +184,63 @@ static int cros_ec_sensorhub_probe(struct platform_device *pdev)
 		}
 	}
 
+	/*
+	 * If 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);
+	}
+
+	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,
 };
diff --git a/drivers/platform/chrome/cros_ec_sensorhub_ring.c b/drivers/platform/chrome/cros_ec_sensorhub_ring.c
new file mode 100644
index 000000000000..230e6cf3da2f
--- /dev/null
+++ b/drivers/platform/chrome/cros_ec_sensorhub_ring.c
@@ -0,0 +1,1046 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Driver for Chrome OS EC Sensor hub FIFO.
+ *
+ * Copyright 2020 Google LLC
+ */
+
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/iio/iio.h>
+#include <linux/kernel.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/sort.h>
+#include <linux/slab.h>
+
+/* Precision of fixed point for the m values from the filter */
+#define M_PRECISION BIT(23)
+
+/* Only activate the filter once we have at least this many elements. */
+#define TS_HISTORY_THRESHOLD 8
+
+/*
+ * If we don't have any history entries for this long, empty the filter to
+ * make sure there are no big discontinuities.
+ */
+#define TS_HISTORY_BORED_US 500000
+
+/* To measure by how much the filter is overshooting, if it happens. */
+#define FUTURE_TS_ANALYTICS_COUNT_MAX 100
+
+static inline int
+cros_sensorhub_send_sample(struct cros_ec_sensorhub *sensorhub,
+			   struct cros_ec_sensors_ring_sample *sample)
+{
+	cros_ec_sensorhub_push_data_cb_t cb;
+	int id = sample->sensor_id;
+	struct iio_dev *indio_dev;
+
+	if (id > sensorhub->sensor_num)
+		return -EINVAL;
+
+	cb = sensorhub->push_data[id].push_data_cb;
+	if (!cb)
+		return 0;
+
+	indio_dev = sensorhub->push_data[id].indio_dev;
+
+	if (sample->flag & MOTIONSENSE_SENSOR_FLAG_FLUSH)
+		return 0;
+
+	return cb(indio_dev, sample->vector, sample->timestamp);
+}
+
+/**
+ * cros_ec_sensorhub_register_push_data() - register the callback to the hub.
+ *
+ * @sensorhub : Sensor Hub object
+ * @sensor_num : The sensor the caller is interested in.
+ * @indio_dev : The iio device to use when a sample arrives.
+ * @cb : The callback to call when a sample arrives.
+ *
+ * The callback cb will be used by cros_ec_sensorhub_ring to distribute events
+ * from the EC.
+ *
+ * Return: 0 when callback is registered.
+ *         EINVAL is the sensor number is invalid or the slot already used.
+ */
+int cros_ec_sensorhub_register_push_data(struct cros_ec_sensorhub *sensorhub,
+					 u8 sensor_num,
+					 struct iio_dev *indio_dev,
+					 cros_ec_sensorhub_push_data_cb_t cb)
+{
+	if (sensor_num >= sensorhub->sensor_num)
+		return -EINVAL;
+	if (sensorhub->push_data[sensor_num].indio_dev)
+		return -EINVAL;
+
+	sensorhub->push_data[sensor_num].indio_dev = indio_dev;
+	sensorhub->push_data[sensor_num].push_data_cb = cb;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(cros_ec_sensorhub_register_push_data);
+
+void cros_ec_sensorhub_unregister_push_data(struct cros_ec_sensorhub *sensorhub,
+					    u8 sensor_num)
+{
+	sensorhub->push_data[sensor_num].indio_dev = NULL;
+	sensorhub->push_data[sensor_num].push_data_cb = NULL;
+}
+EXPORT_SYMBOL_GPL(cros_ec_sensorhub_unregister_push_data);
+
+/**
+ * cros_ec_sensorhub_ring_fifo_enable() - Enable or disable interrupt generation
+ *					  for FIFO events.
+ * @sensorhub: Sensor Hub object
+ * @on: true when events are requested.
+ *
+ * To be called before sleeping or when noone is listening.
+ * Return: 0 on success, or an error when we can not communicate with the EC.
+ *
+ */
+int cros_ec_sensorhub_ring_fifo_enable(struct cros_ec_sensorhub *sensorhub,
+				       bool on)
+{
+	int ret, i;
+
+	mutex_lock(&sensorhub->cmd_lock);
+	if (sensorhub->tight_timestamps)
+		for (i = 0; i < sensorhub->sensor_num; i++)
+			sensorhub->batch_state[i].last_len = 0;
+
+	sensorhub->params->cmd = MOTIONSENSE_CMD_FIFO_INT_ENABLE;
+	sensorhub->params->fifo_int_enable.enable = on;
+
+	sensorhub->msg->outsize = sizeof(struct ec_params_motion_sense);
+	sensorhub->msg->insize = sizeof(struct ec_response_motion_sense);
+
+	ret = cros_ec_cmd_xfer_status(sensorhub->ec->ec_dev, sensorhub->msg);
+	mutex_unlock(&sensorhub->cmd_lock);
+
+	/* We expect to receive a payload of 4 bytes, ignore. */
+	if (ret > 0)
+		ret = 0;
+
+	return ret;
+}
+
+static int cros_ec_sensor_ring_median_cmp(const void *pv1, const void *pv2)
+{
+	s64 v1 = *(s64 *)pv1;
+	s64 v2 = *(s64 *)pv2;
+
+	if (v1 > v2)
+		return 1;
+	else if (v1 < v2)
+		return -1;
+	else
+		return 0;
+}
+
+/*
+ * cros_ec_sensor_ring_median: Gets median of an array of numbers
+ *
+ * For now it's implemented using an inefficient > O(n) sort then return
+ * the middle element. A more optimal method would be something like
+ * quickselect, but given that n = 64 we can probably live with it in the
+ * name of clarity.
+ *
+ * Warning: the input array gets modified (sorted)!
+ */
+static s64 cros_ec_sensor_ring_median(s64 *array, size_t length)
+{
+	sort(array, length, sizeof(s64), cros_ec_sensor_ring_median_cmp, NULL);
+	return array[length / 2];
+}
+
+/*
+ * IRQ Timestamp Filtering
+ *
+ * Lower down in cros_ec_sensor_ring_process_event(), for each sensor event
+ * we have to calculate it's timestamp in the AP timebase. There are 3 time
+ * points:
+ *   a - EC timebase, sensor event
+ *   b - EC timebase, IRQ
+ *   c - AP timebase, IRQ
+ *   a' - what we want: sensor even in AP timebase
+ *
+ * While a and b are recorded at accurate times (due to the EC real time
+ * nature); c is pretty untrustworthy, even though it's recorded the
+ * first thing in ec_irq_handler(). There is a very good change we'll get
+ * added lantency due to:
+ *   other irqs
+ *   ddrfreq
+ *   cpuidle
+ *
+ * Normally a' = c - b + a, but if we do that naive math any jitter in c
+ * will get coupled in a', which we don't want. We want a function
+ * a' = cros_ec_sensor_ring_ts_filter(a) which will filter out outliers in c.
+ *
+ * Think of a graph of AP time(b) on the y axis vs EC time(c) on the x axis.
+ * The slope of the line won't be exactly 1, there will be some clock drift
+ * between the 2 chips for various reasons (mechanical stress, temperature,
+ * voltage). We need to extrapolate values for a future x, without trusting
+ * recent y values too much.
+ *
+ * We use a median filter for the slope, then another median filter for the
+ * y-intercept to calculate this function:
+ *   dx[n] = x[n-1] - x[n]
+ *   dy[n] = x[n-1] - x[n]
+ *   m[n] = dy[n] / dx[n]
+ *   median_m = median(m[n-k:n])
+ *   error[i] = y[n-i] - median_m * x[n-i]
+ *   median_error = median(error[:k])
+ *   predicted_y = median_m * x + median_error
+ *
+ * Implementation differences from above:
+ * - Redefined y to be actually c - b, this gives us a lot more precision
+ * to do the math. (c-b)/b variations are more obvious than c/b variations.
+ * - Since we don't have floating point, any operations involving slope are
+ * done using fixed point math (*M_PRECISION)
+ * - Since x and y grow with time, we keep zeroing the graph (relative to
+ * the last sample), this way math involving *x[n-i] will not overflow
+ * - EC timestamps are kept in us, it improves the slope calculation precision
+ */
+
+/**
+ * cros_ec_sensor_ring_ts_filter_update() - Update filter history.
+ *
+ * @state: Filter information.
+ * @b: IRQ timestamp, EC timebase (us)
+ * @c: IRQ timestamp, AP timebase (ns)
+ *
+ * Given a new IRQ timestamp pair (EC and AP timebases), add it to the filter
+ * history.
+ */
+static void
+cros_ec_sensor_ring_ts_filter_update(struct cros_ec_sensors_ts_filter_state
+				     *state,
+				     s64 b, s64 c)
+{
+	s64 x, y;
+	s64 dx, dy;
+	s64 m; /* stored as *M_PRECISION */
+	s64 *m_history_copy = state->temp_buf;
+	s64 *error = state->temp_buf;
+	int i;
+
+	/* we trust b the most, that'll be our independent variable */
+	x = b;
+	/* y is the offset between AP and EC times, in ns */
+	y = c - b * 1000;
+
+	dx = (state->x_history[0] + state->x_offset) - x;
+	if (dx == 0)
+		return; /* we already have this irq in the history */
+	dy = (state->y_history[0] + state->y_offset) - y;
+	m = div64_s64(dy * M_PRECISION, dx);
+
+	/* Empty filter if we haven't seen any action in a while. */
+	if (-dx > TS_HISTORY_BORED_US)
+		state->history_len = 0;
+
+	/* Move everything over, also update offset to all absolute coords .*/
+	for (i = state->history_len - 1; i >= 1; i--) {
+		state->x_history[i] = state->x_history[i - 1] + dx;
+		state->y_history[i] = state->y_history[i - 1] + dy;
+
+		state->m_history[i] = state->m_history[i - 1];
+		/*
+		 * Also use the same loop to copy m_history for future
+		 * median extraction.
+		 */
+		m_history_copy[i] = state->m_history[i - 1];
+	}
+
+	/* Store the x and y, but remember offset is actually last sample. */
+	state->x_offset = x;
+	state->y_offset = y;
+	state->x_history[0] = 0;
+	state->y_history[0] = 0;
+
+	state->m_history[0] = m;
+	m_history_copy[0] = m;
+
+	if (state->history_len < CROS_EC_SENSORHUB_TS_HISTORY_SIZE)
+		state->history_len++;
+
+	/* Precalculate things for the filter. */
+	if (state->history_len > TS_HISTORY_THRESHOLD) {
+		state->median_m =
+		    cros_ec_sensor_ring_median(m_history_copy,
+					       state->history_len - 1);
+
+		/*
+		 * Calculate y-intercepts as if m_median is the slope and
+		 * points in the history are on the line. median_error will
+		 * still be in the offset coordinate system.
+		 */
+		for (i = 0; i < state->history_len; i++)
+			error[i] = state->y_history[i] -
+				div_s64(state->median_m * state->x_history[i],
+					M_PRECISION);
+		state->median_error =
+			cros_ec_sensor_ring_median(error, state->history_len);
+	} else {
+		state->median_m = 0;
+		state->median_error = 0;
+	}
+}
+
+/**
+ * cros_ec_sensor_ring_ts_filter() - Translate EC timebase timestamp to AP
+ *                                   timebase
+ *
+ * @state: filter information.
+ * @x: any ec timestamp (us):
+ *
+ * cros_ec_sensor_ring_ts_filter(a) => a' event timestamp, AP timebase
+ * cros_ec_sensor_ring_ts_filter(b) => calculated timestamp when the EC IRQ
+ *                           should have happened on the AP, with low jitter
+ *
+ * Note: The filter will only activate once state->history_len goes
+ * over TS_HISTORY_THRESHOLD. Otherwise it'll just do the naive c - b + a
+ * transform.
+ *
+ * How to derive the formula, starting from:
+ *   f(x) = median_m * x + median_error
+ * That's the calculated AP - EC offset (at the x point in time)
+ * Undo the coordinate system transform:
+ *   f(x) = median_m * (x - x_offset) + median_error + y_offset
+ * Remember to undo the "y = c - b * 1000" modification:
+ *   f(x) = median_m * (x - x_offset) + median_error + y_offset + x * 1000
+ *
+ * Return: timestamp in AP timebase (ns)
+ */
+static s64
+cros_ec_sensor_ring_ts_filter(struct cros_ec_sensors_ts_filter_state *state,
+			      s64 x)
+{
+	return div_s64(state->median_m * (x - state->x_offset), M_PRECISION)
+	       + state->median_error + state->y_offset + x * 1000;
+}
+
+/*
+ * Since a and b were originally 32 bit values from the EC,
+ * they overflow relatively often, casting is not enough, so we need to
+ * add an offset.
+ */
+static void
+cros_ec_sensor_ring_fix_overflow(s64 *ts,
+				 const s64 overflow_period,
+				 struct cros_ec_sensors_ec_overflow_state
+				 *state)
+{
+	s64 adjust;
+
+	*ts += state->offset;
+	if (abs(state->last - *ts) > (overflow_period / 2)) {
+		adjust = state->last > *ts ? overflow_period : -overflow_period;
+		state->offset += adjust;
+		*ts += adjust;
+	}
+	state->last = *ts;
+}
+
+static void
+cros_ec_sensor_ring_check_for_past_timestamp(struct cros_ec_sensorhub
+					     *sensorhub,
+					     struct cros_ec_sensors_ring_sample
+					     *sample)
+{
+	const u8 sensor_id = sample->sensor_id;
+
+	/* If this event is earlier than one we saw before... */
+	if (sensorhub->batch_state[sensor_id].newest_sensor_event >
+	    sample->timestamp)
+		/* mark it for spreading. */
+		sample->timestamp =
+			sensorhub->batch_state[sensor_id].last_ts;
+	else
+		sensorhub->batch_state[sensor_id].newest_sensor_event =
+			sample->timestamp;
+}
+
+/**
+ * cros_ec_sensor_ring_process_event() - Process one EC FIFO event
+ *
+ * @sensorhub: Sensor Hub object.
+ * @fifo_info: FIFO information from the EC (includes b point, EC timebase).
+ * @fifo_timestamp: EC IRQ, kernel timebase (aka c).
+ * @current_timestamp: calculated event timestamp, kernel timebase (aka a').
+ * @in: incoming FIFO event from EC (includes a point, EC timebase).
+ * @out: outgoing event to user space (includes a').
+ *
+ * Process one EC event, add it in the ring if necessary.
+ *
+ * Return: true if out event has been populated.
+ */
+static bool
+cros_ec_sensor_ring_process_event(struct cros_ec_sensorhub *sensorhub,
+				const struct ec_response_motion_sense_fifo_info
+				*fifo_info,
+				const ktime_t fifo_timestamp,
+				ktime_t *current_timestamp,
+				struct ec_response_motion_sensor_data *in,
+				struct cros_ec_sensors_ring_sample *out)
+{
+	const s64 now = cros_ec_get_time_ns();
+	int axis, async_flags;
+
+	/* Do not populate the filter based on asynchronous events. */
+	async_flags = in->flags &
+		(MOTIONSENSE_SENSOR_FLAG_ODR | MOTIONSENSE_SENSOR_FLAG_FLUSH);
+
+	if (in->flags & MOTIONSENSE_SENSOR_FLAG_TIMESTAMP && !async_flags) {
+		s64 a = in->timestamp;
+		s64 b = fifo_info->timestamp;
+		s64 c = fifo_timestamp;
+
+		cros_ec_sensor_ring_fix_overflow(&a, 1LL << 32,
+					  &sensorhub->overflow_a);
+		cros_ec_sensor_ring_fix_overflow(&b, 1LL << 32,
+					  &sensorhub->overflow_b);
+
+		if (sensorhub->tight_timestamps) {
+			cros_ec_sensor_ring_ts_filter_update(
+					&sensorhub->filter, b, c);
+			*current_timestamp = cros_ec_sensor_ring_ts_filter(
+					&sensorhub->filter, a);
+		} else {
+			s64 new_timestamp;
+
+			/*
+			 * Disable filtering since we might add more jitter
+			 * if b is in a random point in time.
+			 */
+			new_timestamp = fifo_timestamp -
+					fifo_info->timestamp  * 1000 +
+					in->timestamp * 1000;
+			/*
+			 * The timestamp can be stale if we had to use the fifo
+			 * info timestamp.
+			 */
+			if (new_timestamp - *current_timestamp > 0)
+				*current_timestamp = new_timestamp;
+		}
+	}
+
+	if (in->flags & MOTIONSENSE_SENSOR_FLAG_ODR) {
+		if (sensorhub->tight_timestamps) {
+			sensorhub->batch_state[in->sensor_num].last_len = 0;
+			sensorhub->batch_state[in->sensor_num].penul_len = 0;
+		}
+		/*
+		 * ODR change is only useful for the sensor_ring, it does not
+		 * convey information to clients.
+		 */
+		return false;
+	}
+
+	if (in->flags & MOTIONSENSE_SENSOR_FLAG_FLUSH) {
+		out->sensor_id = in->sensor_num;
+		out->timestamp = *current_timestamp;
+		out->flag = in->flags;
+		if (sensorhub->tight_timestamps)
+			sensorhub->batch_state[out->sensor_id].last_len = 0;
+		/*
+		 * No other payload information provided with
+		 * flush ack.
+		 */
+		return true;
+	}
+
+	if (in->flags & MOTIONSENSE_SENSOR_FLAG_TIMESTAMP)
+		/* If we just have a timestamp, skip this entry. */
+		return false;
+
+	/* Regular sample */
+	out->sensor_id = in->sensor_num;
+	if (*current_timestamp - now > 0) {
+		/*
+		 * This fix is needed to overcome the timestamp filter putting
+		 * events in the future.
+		 */
+		sensorhub->future_timestamp_total_ns +=
+			*current_timestamp - now;
+		if (++sensorhub->future_timestamp_count ==
+				FUTURE_TS_ANALYTICS_COUNT_MAX) {
+			s64 avg = div_s64(sensorhub->future_timestamp_total_ns,
+					sensorhub->future_timestamp_count);
+			dev_warn_ratelimited(sensorhub->dev,
+					     "100 timestamps in the future, %lldns shaved on average\n",
+					     avg);
+			sensorhub->future_timestamp_count = 0;
+			sensorhub->future_timestamp_total_ns = 0;
+		}
+		out->timestamp = now;
+	} else {
+		out->timestamp = *current_timestamp;
+	}
+
+	out->flag = in->flags;
+	for (axis = 0; axis < 3; axis++)
+		out->vector[axis] = in->data[axis];
+
+	if (sensorhub->tight_timestamps)
+		cros_ec_sensor_ring_check_for_past_timestamp(sensorhub, out);
+	return true;
+}
+
+/*
+ * cros_ec_sensor_ring_spread_add: Calculate proper timestamps then add to
+ *                                 ringbuffer.
+ *
+ * This is the new spreading code, assumes every sample's timestamp
+ * preceeds the sample. Run if tight_timestamps == true.
+ *
+ * Sometimes the EC receives only one interrupt (hence timestamp) for
+ * a batch of samples. Only the first sample will have the correct
+ * timestamp. So we must interpolate the other samples.
+ * We use the previous batch timestamp and our current batch timestamp
+ * as a way to calculate period, then spread the samples evenly.
+ *
+ * s0 int, 0ms
+ * s1 int, 10ms
+ * s2 int, 20ms
+ * 30ms point goes by, no interrupt, previous one is still asserted
+ * downloading s2 and s3
+ * s3 sample, 20ms (incorrect timestamp)
+ * s4 int, 40ms
+ *
+ * The batches are [(s0), (s1), (s2, s3), (s4)]. Since the 3rd batch
+ * has 2 samples in them, we adjust the timestamp of s3.
+ * s2 - s1 = 10ms, so s3 must be s2 + 10ms => 20ms. If s1 would have
+ * been part of a bigger batch things would have gotten a little
+ * more complicated.
+ *
+ * Note: we also assume another sensor sample doesn't break up a batch
+ * in 2 or more partitions. Example, there can't ever be a sync sensor
+ * in between S2 and S3. This simplifies the following code.
+ */
+static void
+cros_ec_sensor_ring_spread_add(struct cros_ec_sensorhub *sensorhub,
+			       unsigned long sensor_mask,
+			       struct cros_ec_sensors_ring_sample *last_out)
+{
+	struct cros_ec_sensors_ring_sample *batch_start, *next_batch_start;
+	int id;
+
+	for_each_set_bit(id, &sensor_mask, sensorhub->sensor_num) {
+		for (batch_start = sensorhub->ring; batch_start < last_out;
+		     batch_start = next_batch_start) {
+			/*
+			 * For each batch (where all samples have the same
+			 * timestamp).
+			 */
+			int batch_len, sample_idx;
+			struct cros_ec_sensors_ring_sample *batch_end =
+				batch_start;
+			struct cros_ec_sensors_ring_sample *s;
+			s64 batch_timestamp = batch_start->timestamp;
+			s64 sample_period;
+
+			/*
+			 * Skip over batches that start with the sensor types
+			 * we're not looking at right now.
+			 */
+			if (batch_start->sensor_id != id) {
+				next_batch_start = batch_start + 1;
+				continue;
+			}
+
+			/*
+			 * Do not start a batch
+			 * from a flush, as it happens asynchronously to the
+			 * regular flow of events.
+			 */
+			if (batch_start->flag & MOTIONSENSE_SENSOR_FLAG_FLUSH) {
+				cros_sensorhub_send_sample(sensorhub,
+							   batch_start);
+				next_batch_start = batch_start + 1;
+				continue;
+			}
+
+			if (batch_start->timestamp <=
+			    sensorhub->batch_state[id].last_ts) {
+				batch_timestamp =
+					sensorhub->batch_state[id].last_ts;
+				batch_len = sensorhub->batch_state[id].last_len;
+
+				sample_idx = batch_len;
+
+				sensorhub->batch_state[id].last_ts =
+				  sensorhub->batch_state[id].penul_ts;
+				sensorhub->batch_state[id].last_len =
+				  sensorhub->batch_state[id].penul_len;
+			} else {
+				/*
+				 * Push first sample in the batch to the,
+				 * kifo, it's guaranteed to be correct, the
+				 * rest will follow later on.
+				 */
+				sample_idx = 1;
+				batch_len = 1;
+				cros_sensorhub_send_sample(sensorhub,
+							   batch_start);
+				batch_start++;
+			}
+
+			/* Find all samples have the same timestamp. */
+			for (s = batch_start; s < last_out; s++) {
+				if (s->sensor_id != id)
+					/*
+					 * Skip over other sensor types that
+					 * are interleaved, don't count them.
+					 */
+					continue;
+				if (s->timestamp != batch_timestamp)
+					/* we discovered the next batch */
+					break;
+				if (s->flag & MOTIONSENSE_SENSOR_FLAG_FLUSH)
+					/* break on flush packets */
+					break;
+				batch_end = s;
+				batch_len++;
+			}
+
+			if (batch_len == 1)
+				goto done_with_this_batch;
+
+			/* Can we calculate period? */
+			if (sensorhub->batch_state[id].last_len == 0) {
+				dev_warn(sensorhub->dev, "Sensor %d: lost %d samples when spreading\n",
+					 id, batch_len - 1);
+				goto done_with_this_batch;
+				/*
+				 * Note: we're dropping the rest of the samples
+				 * in this batch since we have no idea where
+				 * they're supposed to go without a period
+				 * calculation.
+				 */
+			}
+
+			sample_period = div_s64(batch_timestamp -
+				sensorhub->batch_state[id].last_ts,
+				sensorhub->batch_state[id].last_len);
+			dev_dbg(sensorhub->dev,
+				"Adjusting %d samples, sensor %d last_batch @%lld (%d samples) batch_timestamp=%lld => period=%lld\n",
+				batch_len, id,
+				sensorhub->batch_state[id].last_ts,
+				sensorhub->batch_state[id].last_len,
+				batch_timestamp,
+				sample_period);
+
+			/*
+			 * Adjust timestamps of the samples then push them to
+			 * kfifo.
+			 */
+			for (s = batch_start; s <= batch_end; s++) {
+				if (s->sensor_id != id)
+					/*
+					 * Skip over other sensor types that
+					 * are interleaved, don't change them.
+					 */
+					continue;
+
+				s->timestamp = batch_timestamp +
+					sample_period * sample_idx;
+				sample_idx++;
+
+				cros_sensorhub_send_sample(sensorhub, s);
+			}
+
+done_with_this_batch:
+			sensorhub->batch_state[id].penul_ts =
+				sensorhub->batch_state[id].last_ts;
+			sensorhub->batch_state[id].penul_len =
+				sensorhub->batch_state[id].last_len;
+
+			sensorhub->batch_state[id].last_ts =
+				batch_timestamp;
+			sensorhub->batch_state[id].last_len = batch_len;
+
+			next_batch_start = batch_end + 1;
+		}
+	}
+}
+
+/*
+ * cros_ec_sensor_ring_spread_add_legacy: Calculate proper timestamps then
+ * add to ringbuffer (legacy).
+ *
+ * Note: This assumes we're running old firmware, where every sample's timestamp
+ * is after the sample. Run if tight_timestamps == false.
+ *
+ * If there is a sample with a proper timestamp
+ *
+ *                        timestamp | count
+ *                        -----------------
+ * older_unprocess_out --> TS1      | 1
+ *                         TS1      | 2
+ *                out -->  TS1      | 3
+ *           next_out -->  TS2      |
+ *
+ * We spread time for the samples [older_unprocess_out .. out]
+ * between TS1 and TS2: [TS1+1/4, TS1+2/4, TS1+3/4, TS2].
+ *
+ * If we reach the end of the samples, we compare with the
+ * current timestamp:
+ *
+ * older_unprocess_out --> TS1      | 1
+ *                         TS1      | 2
+ *                 out --> TS1      | 3
+ *
+ * We know have [TS1+1/3, TS1+2/3, current timestamp]
+ */
+static void
+cros_ec_sensor_ring_spread_add_legacy(struct cros_ec_sensorhub *sensorhub,
+				      unsigned long sensor_mask,
+				      s64 current_timestamp,
+				      struct cros_ec_sensors_ring_sample
+				      *last_out)
+{
+	struct cros_ec_sensors_ring_sample *out;
+	int i;
+
+	for_each_set_bit(i, &sensor_mask, sensorhub->sensor_num) {
+		s64 older_timestamp;
+		s64 timestamp;
+		struct cros_ec_sensors_ring_sample *older_unprocess_out =
+			sensorhub->ring;
+		struct cros_ec_sensors_ring_sample *next_out;
+		int count = 1;
+
+		for (out = sensorhub->ring; out < last_out; out = next_out) {
+			s64 time_period;
+
+			next_out = out + 1;
+			if (out->sensor_id != i)
+				continue;
+
+			/* Timestamp to start with */
+			older_timestamp = out->timestamp;
+
+			/* Find next sample. */
+			while (next_out < last_out && next_out->sensor_id != i)
+				next_out++;
+
+			if (next_out >= last_out) {
+				timestamp = current_timestamp;
+			} else {
+				timestamp = next_out->timestamp;
+				if (timestamp == older_timestamp) {
+					count++;
+					continue;
+				}
+			}
+
+			/*
+			 * The next sample has a new timestamp, spread the
+			 * unprocessed samples.
+			 */
+			if (next_out < last_out)
+				count++;
+			time_period = div_s64(timestamp - older_timestamp,
+					      count);
+
+			for (; older_unprocess_out <= out;
+					older_unprocess_out++) {
+				if (older_unprocess_out->sensor_id != i)
+					continue;
+				older_timestamp += time_period;
+				older_unprocess_out->timestamp =
+					older_timestamp;
+			}
+			count = 1;
+			/* The next_out sample has a valid timestamp, skip. */
+			next_out++;
+			older_unprocess_out = next_out;
+		}
+	}
+
+	/* Push the event into the kfifo */
+	for (out = sensorhub->ring; out < last_out; out++)
+		cros_sensorhub_send_sample(sensorhub, out);
+}
+
+/**
+ * cros_ec_sensorhub_ring_handler() - The trigger handler function
+ *
+ * @sensorhub: Sensor Hub object.
+ *
+ * Called by the notifier, process the EC sensor FIFO queue.
+ */
+static void cros_ec_sensorhub_ring_handler(struct cros_ec_sensorhub *sensorhub)
+{
+	struct ec_response_motion_sense_fifo_info *fifo_info =
+		sensorhub->fifo_info;
+	struct cros_ec_dev *ec = sensorhub->ec;
+	ktime_t fifo_timestamp, current_timestamp;
+	int i, j, number_data, ret;
+	unsigned long sensor_mask = 0;
+	struct ec_response_motion_sensor_data *in;
+	struct cros_ec_sensors_ring_sample *out, *last_out;
+
+	mutex_lock(&sensorhub->cmd_lock);
+
+	/* Get FIFO information if there are lost vectors. */
+	if (fifo_info->total_lost) {
+		int fifo_info_length =
+			sizeof(struct ec_response_motion_sense_fifo_info) +
+			sizeof(u16) * sensorhub->sensor_num;
+
+		/* Need to retrieve the number of lost vectors per sensor */
+		sensorhub->params->cmd = MOTIONSENSE_CMD_FIFO_INFO;
+		sensorhub->msg->outsize = 1;
+		sensorhub->msg->insize = fifo_info_length;
+
+		if (cros_ec_cmd_xfer_status(ec->ec_dev, sensorhub->msg) < 0)
+			goto error;
+
+		memcpy(fifo_info, &sensorhub->resp->fifo_info,
+		       fifo_info_length);
+
+		/*
+		 * Update collection time, will not be as precise as the
+		 * non-error case.
+		 */
+		fifo_timestamp = cros_ec_get_time_ns();
+	} else {
+		fifo_timestamp = sensorhub->fifo_timestamp[
+			CROS_EC_SENSOR_NEW_TS];
+	}
+
+	if (fifo_info->count > sensorhub->fifo_size ||
+	    fifo_info->size != sensorhub->fifo_size) {
+		dev_warn(sensorhub->dev,
+			 "Mismatch EC data: count %d, size %d - expected %d",
+			 fifo_info->count, fifo_info->size,
+			 sensorhub->fifo_size);
+		goto error;
+	}
+
+	/* Copy elements in the main fifo */
+	current_timestamp = sensorhub->fifo_timestamp[CROS_EC_SENSOR_LAST_TS];
+	out = sensorhub->ring;
+	for (i = 0; i < fifo_info->count; i += number_data) {
+		sensorhub->params->cmd = MOTIONSENSE_CMD_FIFO_READ;
+		sensorhub->params->fifo_read.max_data_vector =
+			fifo_info->count - i;
+		sensorhub->msg->outsize =
+			sizeof(struct ec_params_motion_sense);
+		sensorhub->msg->insize =
+			sizeof(sensorhub->resp->fifo_read) +
+			sensorhub->params->fifo_read.max_data_vector *
+			  sizeof(struct ec_response_motion_sensor_data);
+		ret = cros_ec_cmd_xfer_status(ec->ec_dev, sensorhub->msg);
+		if (ret < 0) {
+			dev_warn(sensorhub->dev, "Fifo error: %d\n", ret);
+			break;
+		}
+		number_data = sensorhub->resp->fifo_read.number_data;
+		if (number_data == 0) {
+			dev_dbg(sensorhub->dev, "Unexpected empty FIFO\n");
+			break;
+		}
+		if (number_data > fifo_info->count - i) {
+			dev_warn(sensorhub->dev,
+				 "Invalid EC data: too many entry received: %d, expected %d",
+				 number_data, fifo_info->count - i);
+			break;
+		}
+		if (out + number_data >
+		    sensorhub->ring + fifo_info->count) {
+			dev_warn(sensorhub->dev,
+				 "Too many samples: %d (%zd data) to %d entries for expected %d entries",
+				 i, out - sensorhub->ring, i + number_data,
+				 fifo_info->count);
+			break;
+		}
+
+		for (in = sensorhub->resp->fifo_read.data, j = 0;
+		     j < number_data; j++, in++) {
+			if (cros_ec_sensor_ring_process_event(
+						sensorhub, fifo_info,
+						fifo_timestamp,
+						&current_timestamp,
+						in, out)) {
+				sensor_mask |= BIT(in->sensor_num);
+				out++;
+			}
+		}
+	}
+	mutex_unlock(&sensorhub->cmd_lock);
+	last_out = out;
+
+	if (out == sensorhub->ring)
+		/* Unexpected empty FIFO. */
+		goto ring_handler_end;
+
+	/*
+	 * Check if current_timestamp is ahead of the last sample. Normally,
+	 * the EC appends a timestamp after the last sample, but if the AP
+	 * is slow to respond to the IRQ, the EC may have added new samples.
+	 * Use the FIFO info timestamp as last timestamp then.
+	 */
+	if (!sensorhub->tight_timestamps &&
+	    (last_out - 1)->timestamp == current_timestamp)
+		current_timestamp = fifo_timestamp;
+
+	/* Warn on lost samples. */
+	if (fifo_info->total_lost)
+		for (i = 0; i < sensorhub->sensor_num; i++) {
+			if (fifo_info->lost[i]) {
+				dev_warn_ratelimited(sensorhub->dev,
+						     "Sensor %d: lost: %d out of %d\n",
+						     i, fifo_info->lost[i],
+						     fifo_info->total_lost);
+				if (sensorhub->tight_timestamps)
+					sensorhub->batch_state[i].last_len = 0;
+			}
+		}
+
+	/*
+	 * Spread samples in case of batching, then add them to the
+	 * ringbuffer.
+	 */
+	if (sensorhub->tight_timestamps)
+		cros_ec_sensor_ring_spread_add(sensorhub, sensor_mask,
+					       last_out);
+	else
+		cros_ec_sensor_ring_spread_add_legacy(sensorhub, sensor_mask,
+						      current_timestamp,
+						      last_out);
+
+ring_handler_end:
+	sensorhub->fifo_timestamp[CROS_EC_SENSOR_LAST_TS] = current_timestamp;
+	return;
+
+error:
+	mutex_unlock(&sensorhub->cmd_lock);
+}
+
+static int cros_ec_sensorhub_event(struct notifier_block *nb,
+				   unsigned long queued_during_suspend,
+				   void *_notify)
+{
+	struct cros_ec_sensorhub *sensorhub;
+	struct cros_ec_device *ec_dev;
+
+	sensorhub = container_of(nb, struct cros_ec_sensorhub, notifier);
+	ec_dev = sensorhub->ec->ec_dev;
+
+	if (ec_dev->event_data.event_type != EC_MKBP_EVENT_SENSOR_FIFO)
+		return NOTIFY_DONE;
+
+	if (ec_dev->event_size != sizeof(ec_dev->event_data.data.sensor_fifo)) {
+		dev_warn(ec_dev->dev, "Invalid fifo info size\n");
+		return NOTIFY_DONE;
+	}
+
+	if (queued_during_suspend)
+		return NOTIFY_OK;
+
+	memcpy(sensorhub->fifo_info, &ec_dev->event_data.data.sensor_fifo.info,
+	       sizeof(*sensorhub->fifo_info));
+	sensorhub->fifo_timestamp[CROS_EC_SENSOR_NEW_TS] =
+		ec_dev->last_event_time;
+	cros_ec_sensorhub_ring_handler(sensorhub);
+
+	return NOTIFY_OK;
+}
+
+/**
+ * cros_ec_sensorhub_ring_add() - Add the FIFO functionality if the EC
+ *				  supports it.
+ *
+ * @sensorhub : Sensor Hub object.
+ *
+ * Return: 0 on success.
+ */
+int cros_ec_sensorhub_ring_add(struct cros_ec_sensorhub *sensorhub)
+{
+	struct cros_ec_dev *ec = sensorhub->ec;
+	int ret;
+	int fifo_info_length =
+		sizeof(struct ec_response_motion_sense_fifo_info) +
+		sizeof(u16) * sensorhub->sensor_num;
+
+	/* Allocate the array for lost events. */
+	sensorhub->fifo_info = devm_kzalloc(sensorhub->dev, fifo_info_length,
+					    GFP_KERNEL);
+	if (!sensorhub->fifo_info)
+		return -ENOMEM;
+
+	/* Retrieve FIFO information */
+	sensorhub->msg->version = 2;
+	sensorhub->params->cmd = MOTIONSENSE_CMD_FIFO_INFO;
+	sensorhub->msg->outsize = 1;
+	sensorhub->msg->insize = fifo_info_length;
+
+	ret = cros_ec_cmd_xfer_status(ec->ec_dev, sensorhub->msg);
+	if (ret < 0)
+		return ret;
+
+	/*
+	 * Allocate the full fifo. We need to copy the whole FIFO to set
+	 * timestamps properly.
+	 */
+	sensorhub->fifo_size = sensorhub->resp->fifo_info.size;
+	sensorhub->ring = devm_kcalloc(sensorhub->dev, sensorhub->fifo_size,
+				       sizeof(*sensorhub->ring), GFP_KERNEL);
+	if (!sensorhub->ring)
+		return -ENOMEM;
+
+	/*
+	 * Allocate the callback area based on the number of sensors.
+	 */
+	sensorhub->push_data = devm_kcalloc(
+			sensorhub->dev, sensorhub->sensor_num,
+			sizeof(*sensorhub->push_data),
+			GFP_KERNEL);
+	if (!sensorhub->push_data)
+		return -ENOMEM;
+
+	sensorhub->fifo_timestamp[CROS_EC_SENSOR_LAST_TS] =
+		cros_ec_get_time_ns();
+
+	sensorhub->tight_timestamps = cros_ec_check_features(
+			ec, EC_FEATURE_MOTION_SENSE_TIGHT_TIMESTAMPS);
+
+	if (sensorhub->tight_timestamps) {
+		sensorhub->batch_state = devm_kcalloc(sensorhub->dev,
+				sensorhub->sensor_num,
+				sizeof(*sensorhub->batch_state),
+				GFP_KERNEL);
+		if (!sensorhub->batch_state)
+			return -ENOMEM;
+	}
+
+	/* Register the notifier that will act as a top half interrupt. */
+	sensorhub->notifier.notifier_call = cros_ec_sensorhub_event;
+	ret = blocking_notifier_chain_register(&ec->ec_dev->event_notifier,
+					       &sensorhub->notifier);
+	if (ret < 0)
+		return ret;
+
+	/* Start collection samples. */
+	return cros_ec_sensorhub_ring_fifo_enable(sensorhub, true);
+}
+
+void cros_ec_sensorhub_ring_remove(void *arg)
+{
+	struct cros_ec_sensorhub *sensorhub = arg;
+	struct cros_ec_device *ec_dev = sensorhub->ec->ec_dev;
+
+	/* Disable the ring, prevent EC interrupt to the AP for nothing. */
+	cros_ec_sensorhub_ring_fifo_enable(sensorhub, false);
+	blocking_notifier_chain_unregister(&ec_dev->event_notifier,
+					   &sensorhub->notifier);
+}
diff --git a/drivers/platform/chrome/cros_ec_spi.c b/drivers/platform/chrome/cros_ec_spi.c
index 46786d2d679a..debea5c4c829 100644
--- a/drivers/platform/chrome/cros_ec_spi.c
+++ b/drivers/platform/chrome/cros_ec_spi.c
@@ -127,7 +127,8 @@ static int terminate_request(struct cros_ec_device *ec_dev)
 	 */
 	spi_message_init(&msg);
 	memset(&trans, 0, sizeof(trans));
-	trans.delay_usecs = ec_spi->end_of_msg_delay;
+	trans.delay.value = ec_spi->end_of_msg_delay;
+	trans.delay.unit = SPI_DELAY_UNIT_USECS;
 	spi_message_add_tail(&trans, &msg);
 
 	ret = spi_sync_locked(ec_spi->spi, &msg);
@@ -416,7 +417,8 @@ static int do_cros_ec_pkt_xfer_spi(struct cros_ec_device *ec_dev,
 	spi_message_init(&msg);
 	if (ec_spi->start_of_msg_delay) {
 		memset(&trans_delay, 0, sizeof(trans_delay));
-		trans_delay.delay_usecs = ec_spi->start_of_msg_delay;
+		trans_delay.delay.value = ec_spi->start_of_msg_delay;
+		trans_delay.delay.unit = SPI_DELAY_UNIT_USECS;
 		spi_message_add_tail(&trans_delay, &msg);
 	}
 
diff --git a/drivers/platform/chrome/cros_ec_sysfs.c b/drivers/platform/chrome/cros_ec_sysfs.c
index 07dac97ad57c..d45ea5d5bfa4 100644
--- a/drivers/platform/chrome/cros_ec_sysfs.c
+++ b/drivers/platform/chrome/cros_ec_sysfs.c
@@ -149,14 +149,14 @@ static ssize_t version_show(struct device *dev,
 	/* Get build info. */
 	msg->command = EC_CMD_GET_BUILD_INFO + ec->cmd_offset;
 	msg->insize = EC_HOST_PARAM_SIZE;
-	ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
-	if (ret < 0)
-		count += scnprintf(buf + count, PAGE_SIZE - count,
-				   "Build info:    XFER ERROR %d\n", ret);
-	else if (msg->result != EC_RES_SUCCESS)
+	ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
+	if (ret == -EPROTO) {
 		count += scnprintf(buf + count, PAGE_SIZE - count,
 				   "Build info:    EC error %d\n", msg->result);
-	else {
+	} else if (ret < 0) {
+		count += scnprintf(buf + count, PAGE_SIZE - count,
+				   "Build info:    XFER ERROR %d\n", ret);
+	} else {
 		msg->data[EC_HOST_PARAM_SIZE - 1] = '\0';
 		count += scnprintf(buf + count, PAGE_SIZE - count,
 				   "Build info:    %s\n", msg->data);
@@ -165,14 +165,14 @@ static ssize_t version_show(struct device *dev,
 	/* Get chip info. */
 	msg->command = EC_CMD_GET_CHIP_INFO + ec->cmd_offset;
 	msg->insize = sizeof(*r_chip);
-	ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
-	if (ret < 0)
-		count += scnprintf(buf + count, PAGE_SIZE - count,
-				   "Chip info:     XFER ERROR %d\n", ret);
-	else if (msg->result != EC_RES_SUCCESS)
+	ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
+	if (ret == -EPROTO) {
 		count += scnprintf(buf + count, PAGE_SIZE - count,
 				   "Chip info:     EC error %d\n", msg->result);
-	else {
+	} else if (ret < 0) {
+		count += scnprintf(buf + count, PAGE_SIZE - count,
+				   "Chip info:     XFER ERROR %d\n", ret);
+	} else {
 		r_chip = (struct ec_response_get_chip_info *)msg->data;
 
 		r_chip->vendor[sizeof(r_chip->vendor) - 1] = '\0';
@@ -189,14 +189,14 @@ static ssize_t version_show(struct device *dev,
 	/* Get board version */
 	msg->command = EC_CMD_GET_BOARD_VERSION + ec->cmd_offset;
 	msg->insize = sizeof(*r_board);
-	ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
-	if (ret < 0)
-		count += scnprintf(buf + count, PAGE_SIZE - count,
-				   "Board version: XFER ERROR %d\n", ret);
-	else if (msg->result != EC_RES_SUCCESS)
+	ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
+	if (ret == -EPROTO) {
 		count += scnprintf(buf + count, PAGE_SIZE - count,
 				   "Board version: EC error %d\n", msg->result);
-	else {
+	} else if (ret < 0) {
+		count += scnprintf(buf + count, PAGE_SIZE - count,
+				   "Board version: XFER ERROR %d\n", ret);
+	} else {
 		r_board = (struct ec_response_board_version *)msg->data;
 
 		count += scnprintf(buf + count, PAGE_SIZE - count,
diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
new file mode 100644
index 000000000000..874269c07073
--- /dev/null
+++ b/drivers/platform/chrome/cros_ec_typec.c
@@ -0,0 +1,357 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright 2020 Google LLC
+ *
+ * This driver provides the ability to view and manage Type C ports through the
+ * Chrome OS EC.
+ */
+
+#include <linux/acpi.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_data/cros_ec_commands.h>
+#include <linux/platform_data/cros_ec_proto.h>
+#include <linux/platform_device.h>
+#include <linux/usb/typec.h>
+
+#define DRV_NAME "cros-ec-typec"
+
+/* Platform-specific data for the Chrome OS EC Type C controller. */
+struct cros_typec_data {
+	struct device *dev;
+	struct cros_ec_device *ec;
+	int num_ports;
+	unsigned int cmd_ver;
+	/* Array of ports, indexed by port number. */
+	struct typec_port *ports[EC_USB_PD_MAX_PORTS];
+	/* Initial capabilities for each port. */
+	struct typec_capability *caps[EC_USB_PD_MAX_PORTS];
+};
+
+static int cros_typec_parse_port_props(struct typec_capability *cap,
+				       struct fwnode_handle *fwnode,
+				       struct device *dev)
+{
+	const char *buf;
+	int ret;
+
+	memset(cap, 0, sizeof(*cap));
+	ret = fwnode_property_read_string(fwnode, "power-role", &buf);
+	if (ret) {
+		dev_err(dev, "power-role not found: %d\n", ret);
+		return ret;
+	}
+
+	ret = typec_find_port_power_role(buf);
+	if (ret < 0)
+		return ret;
+	cap->type = ret;
+
+	ret = fwnode_property_read_string(fwnode, "data-role", &buf);
+	if (ret) {
+		dev_err(dev, "data-role not found: %d\n", ret);
+		return ret;
+	}
+
+	ret = typec_find_port_data_role(buf);
+	if (ret < 0)
+		return ret;
+	cap->data = ret;
+
+	ret = fwnode_property_read_string(fwnode, "try-power-role", &buf);
+	if (ret) {
+		dev_err(dev, "try-power-role not found: %d\n", ret);
+		return ret;
+	}
+
+	ret = typec_find_power_role(buf);
+	if (ret < 0)
+		return ret;
+	cap->prefer_role = ret;
+
+	cap->fwnode = fwnode;
+
+	return 0;
+}
+
+static int cros_typec_init_ports(struct cros_typec_data *typec)
+{
+	struct device *dev = typec->dev;
+	struct typec_capability *cap;
+	struct fwnode_handle *fwnode;
+	const char *port_prop;
+	int ret;
+	int i;
+	int nports;
+	u32 port_num = 0;
+
+	nports = device_get_child_node_count(dev);
+	if (nports == 0) {
+		dev_err(dev, "No port entries found.\n");
+		return -ENODEV;
+	}
+
+	if (nports > typec->num_ports) {
+		dev_err(dev, "More ports listed than can be supported.\n");
+		return -EINVAL;
+	}
+
+	/* DT uses "reg" to specify port number. */
+	port_prop = dev->of_node ? "reg" : "port-number";
+	device_for_each_child_node(dev, fwnode) {
+		if (fwnode_property_read_u32(fwnode, port_prop, &port_num)) {
+			ret = -EINVAL;
+			dev_err(dev, "No port-number for port, aborting.\n");
+			goto unregister_ports;
+		}
+
+		if (port_num >= typec->num_ports) {
+			dev_err(dev, "Invalid port number.\n");
+			ret = -EINVAL;
+			goto unregister_ports;
+		}
+
+		dev_dbg(dev, "Registering port %d\n", port_num);
+
+		cap = devm_kzalloc(dev, sizeof(*cap), GFP_KERNEL);
+		if (!cap) {
+			ret = -ENOMEM;
+			goto unregister_ports;
+		}
+
+		typec->caps[port_num] = cap;
+
+		ret = cros_typec_parse_port_props(cap, fwnode, dev);
+		if (ret < 0)
+			goto unregister_ports;
+
+		typec->ports[port_num] = typec_register_port(dev, cap);
+		if (IS_ERR(typec->ports[port_num])) {
+			dev_err(dev, "Failed to register port %d\n", port_num);
+			ret = PTR_ERR(typec->ports[port_num]);
+			goto unregister_ports;
+		}
+	}
+
+	return 0;
+
+unregister_ports:
+	for (i = 0; i < typec->num_ports; i++)
+		typec_unregister_port(typec->ports[i]);
+	return ret;
+}
+
+static int cros_typec_ec_command(struct cros_typec_data *typec,
+				 unsigned int version,
+				 unsigned int command,
+				 void *outdata,
+				 unsigned int outsize,
+				 void *indata,
+				 unsigned int insize)
+{
+	struct cros_ec_command *msg;
+	int ret;
+
+	msg = kzalloc(sizeof(*msg) + max(outsize, insize), GFP_KERNEL);
+	if (!msg)
+		return -ENOMEM;
+
+	msg->version = version;
+	msg->command = command;
+	msg->outsize = outsize;
+	msg->insize = insize;
+
+	if (outsize)
+		memcpy(msg->data, outdata, outsize);
+
+	ret = cros_ec_cmd_xfer_status(typec->ec, msg);
+	if (ret >= 0 && insize)
+		memcpy(indata, msg->data, insize);
+
+	kfree(msg);
+	return ret;
+}
+
+static void cros_typec_set_port_params_v0(struct cros_typec_data *typec,
+		int port_num, struct ec_response_usb_pd_control *resp)
+{
+	struct typec_port *port = typec->ports[port_num];
+	enum typec_orientation polarity;
+
+	if (!resp->enabled)
+		polarity = TYPEC_ORIENTATION_NONE;
+	else if (!resp->polarity)
+		polarity = TYPEC_ORIENTATION_NORMAL;
+	else
+		polarity = TYPEC_ORIENTATION_REVERSE;
+
+	typec_set_pwr_role(port, resp->role ? TYPEC_SOURCE : TYPEC_SINK);
+	typec_set_orientation(port, polarity);
+}
+
+static void cros_typec_set_port_params_v1(struct cros_typec_data *typec,
+		int port_num, struct ec_response_usb_pd_control_v1 *resp)
+{
+	struct typec_port *port = typec->ports[port_num];
+	enum typec_orientation polarity;
+
+	if (!(resp->enabled & PD_CTRL_RESP_ENABLED_CONNECTED))
+		polarity = TYPEC_ORIENTATION_NONE;
+	else if (!resp->polarity)
+		polarity = TYPEC_ORIENTATION_NORMAL;
+	else
+		polarity = TYPEC_ORIENTATION_REVERSE;
+	typec_set_orientation(port, polarity);
+	typec_set_data_role(port, resp->role & PD_CTRL_RESP_ROLE_DATA ?
+			TYPEC_HOST : TYPEC_DEVICE);
+	typec_set_pwr_role(port, resp->role & PD_CTRL_RESP_ROLE_POWER ?
+			TYPEC_SOURCE : TYPEC_SINK);
+	typec_set_vconn_role(port, resp->role & PD_CTRL_RESP_ROLE_VCONN ?
+			TYPEC_SOURCE : TYPEC_SINK);
+}
+
+static int cros_typec_port_update(struct cros_typec_data *typec, int port_num)
+{
+	struct ec_params_usb_pd_control req;
+	struct ec_response_usb_pd_control_v1 resp;
+	int ret;
+
+	if (port_num < 0 || port_num >= typec->num_ports) {
+		dev_err(typec->dev, "cannot get status for invalid port %d\n",
+			port_num);
+		return -EINVAL;
+	}
+
+	req.port = port_num;
+	req.role = USB_PD_CTRL_ROLE_NO_CHANGE;
+	req.mux = USB_PD_CTRL_MUX_NO_CHANGE;
+	req.swap = USB_PD_CTRL_SWAP_NONE;
+
+	ret = cros_typec_ec_command(typec, typec->cmd_ver,
+				    EC_CMD_USB_PD_CONTROL, &req, sizeof(req),
+				    &resp, sizeof(resp));
+	if (ret < 0)
+		return ret;
+
+	dev_dbg(typec->dev, "Enabled %d: 0x%hhx\n", port_num, resp.enabled);
+	dev_dbg(typec->dev, "Role %d: 0x%hhx\n", port_num, resp.role);
+	dev_dbg(typec->dev, "Polarity %d: 0x%hhx\n", port_num, resp.polarity);
+	dev_dbg(typec->dev, "State %d: %s\n", port_num, resp.state);
+
+	if (typec->cmd_ver == 1)
+		cros_typec_set_port_params_v1(typec, port_num, &resp);
+	else
+		cros_typec_set_port_params_v0(typec, port_num,
+			(struct ec_response_usb_pd_control *) &resp);
+
+	return 0;
+}
+
+static int cros_typec_get_cmd_version(struct cros_typec_data *typec)
+{
+	struct ec_params_get_cmd_versions_v1 req_v1;
+	struct ec_response_get_cmd_versions resp;
+	int ret;
+
+	/* We're interested in the PD control command version. */
+	req_v1.cmd = EC_CMD_USB_PD_CONTROL;
+	ret = cros_typec_ec_command(typec, 1, EC_CMD_GET_CMD_VERSIONS,
+				    &req_v1, sizeof(req_v1), &resp,
+				    sizeof(resp));
+	if (ret < 0)
+		return ret;
+
+	if (resp.version_mask & EC_VER_MASK(1))
+		typec->cmd_ver = 1;
+	else
+		typec->cmd_ver = 0;
+
+	dev_dbg(typec->dev, "PD Control has version mask 0x%hhx\n",
+		typec->cmd_ver);
+
+	return 0;
+}
+
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id cros_typec_acpi_id[] = {
+	{ "GOOG0014", 0 },
+	{}
+};
+MODULE_DEVICE_TABLE(acpi, cros_typec_acpi_id);
+#endif
+
+#ifdef CONFIG_OF
+static const struct of_device_id cros_typec_of_match[] = {
+	{ .compatible = "google,cros-ec-typec", },
+	{}
+};
+MODULE_DEVICE_TABLE(of, cros_typec_of_match);
+#endif
+
+static int cros_typec_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct cros_typec_data *typec;
+	struct ec_response_usb_pd_ports resp;
+	int ret, i;
+
+	typec = devm_kzalloc(dev, sizeof(*typec), GFP_KERNEL);
+	if (!typec)
+		return -ENOMEM;
+
+	typec->dev = dev;
+	typec->ec = dev_get_drvdata(pdev->dev.parent);
+	platform_set_drvdata(pdev, typec);
+
+	ret = cros_typec_get_cmd_version(typec);
+	if (ret < 0) {
+		dev_err(dev, "failed to get PD command version info\n");
+		return ret;
+	}
+
+	ret = cros_typec_ec_command(typec, 0, EC_CMD_USB_PD_PORTS, NULL, 0,
+				    &resp, sizeof(resp));
+	if (ret < 0)
+		return ret;
+
+	typec->num_ports = resp.num_ports;
+	if (typec->num_ports > EC_USB_PD_MAX_PORTS) {
+		dev_warn(typec->dev,
+			 "Too many ports reported: %d, limiting to max: %d\n",
+			 typec->num_ports, EC_USB_PD_MAX_PORTS);
+		typec->num_ports = EC_USB_PD_MAX_PORTS;
+	}
+
+	ret = cros_typec_init_ports(typec);
+	if (ret < 0)
+		return ret;
+
+	for (i = 0; i < typec->num_ports; i++) {
+		ret = cros_typec_port_update(typec, i);
+		if (ret < 0)
+			goto unregister_ports;
+	}
+
+	return 0;
+
+unregister_ports:
+	for (i = 0; i < typec->num_ports; i++)
+		if (typec->ports[i])
+			typec_unregister_port(typec->ports[i]);
+	return ret;
+}
+
+static struct platform_driver cros_typec_driver = {
+	.driver	= {
+		.name = DRV_NAME,
+		.acpi_match_table = ACPI_PTR(cros_typec_acpi_id),
+		.of_match_table = of_match_ptr(cros_typec_of_match),
+	},
+	.probe = cros_typec_probe,
+};
+
+module_platform_driver(cros_typec_driver);
+
+MODULE_AUTHOR("Prashant Malani <pmalani@chromium.org>");
+MODULE_DESCRIPTION("Chrome OS EC Type C control");
+MODULE_LICENSE("GPL");
diff --git a/drivers/platform/chrome/cros_ec_vbc.c b/drivers/platform/chrome/cros_ec_vbc.c
index 8edae465105c..46482d12cffe 100644
--- a/drivers/platform/chrome/cros_ec_vbc.c
+++ b/drivers/platform/chrome/cros_ec_vbc.c
@@ -40,7 +40,7 @@ static ssize_t vboot_context_read(struct file *filp, struct kobject *kobj,
 	msg->outsize = para_sz;
 	msg->insize = resp_sz;
 
-	err = cros_ec_cmd_xfer(ecdev, msg);
+	err = cros_ec_cmd_xfer_status(ecdev, msg);
 	if (err < 0) {
 		dev_err(dev, "Error sending read request: %d\n", err);
 		kfree(msg);
@@ -83,7 +83,7 @@ static ssize_t vboot_context_write(struct file *filp, struct kobject *kobj,
 	msg->outsize = para_sz;
 	msg->insize = 0;
 
-	err = cros_ec_cmd_xfer(ecdev, msg);
+	err = cros_ec_cmd_xfer_status(ecdev, msg);
 	if (err < 0) {
 		dev_err(dev, "Error sending write request: %d\n", err);
 		kfree(msg);
diff --git a/drivers/platform/chrome/cros_usbpd_notify.c b/drivers/platform/chrome/cros_usbpd_notify.c
new file mode 100644
index 000000000000..7f36142ab12a
--- /dev/null
+++ b/drivers/platform/chrome/cros_usbpd_notify.c
@@ -0,0 +1,306 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright 2020 Google LLC
+ *
+ * This driver serves as the receiver of cros_ec PD host events.
+ */
+
+#include <linux/acpi.h>
+#include <linux/module.h>
+#include <linux/platform_data/cros_ec_proto.h>
+#include <linux/platform_data/cros_usbpd_notify.h>
+#include <linux/platform_device.h>
+
+#define DRV_NAME "cros-usbpd-notify"
+#define DRV_NAME_PLAT_ACPI "cros-usbpd-notify-acpi"
+#define ACPI_DRV_NAME "GOOG0003"
+
+static BLOCKING_NOTIFIER_HEAD(cros_usbpd_notifier_list);
+
+struct cros_usbpd_notify_data {
+	struct device *dev;
+	struct cros_ec_device *ec;
+	struct notifier_block nb;
+};
+
+/**
+ * cros_usbpd_register_notify - Register a notifier callback for PD events.
+ * @nb: Notifier block pointer to register
+ *
+ * On ACPI platforms this corresponds to host events on the ECPD
+ * "GOOG0003" ACPI device. On non-ACPI platforms this will filter mkbp events
+ * for USB PD events.
+ *
+ * Return: 0 on success or negative error code.
+ */
+int cros_usbpd_register_notify(struct notifier_block *nb)
+{
+	return blocking_notifier_chain_register(&cros_usbpd_notifier_list,
+						nb);
+}
+EXPORT_SYMBOL_GPL(cros_usbpd_register_notify);
+
+/**
+ * cros_usbpd_unregister_notify - Unregister notifier callback for PD events.
+ * @nb: Notifier block pointer to unregister
+ *
+ * Unregister a notifier callback that was previously registered with
+ * cros_usbpd_register_notify().
+ */
+void cros_usbpd_unregister_notify(struct notifier_block *nb)
+{
+	blocking_notifier_chain_unregister(&cros_usbpd_notifier_list, nb);
+}
+EXPORT_SYMBOL_GPL(cros_usbpd_unregister_notify);
+
+/**
+ * cros_ec_pd_command - Send a command to the EC.
+ *
+ * @ec_dev: EC device
+ * @command: EC command
+ * @outdata: EC command output data
+ * @outsize: Size of outdata
+ * @indata: EC command input data
+ * @insize: Size of indata
+ *
+ * Return: >= 0 on success, negative error number on failure.
+ */
+static int cros_ec_pd_command(struct cros_ec_device *ec_dev,
+			      int command,
+			      uint8_t *outdata,
+			      int outsize,
+			      uint8_t *indata,
+			      int insize)
+{
+	struct cros_ec_command *msg;
+	int ret;
+
+	msg = kzalloc(sizeof(*msg) + max(insize, outsize), GFP_KERNEL);
+	if (!msg)
+		return -ENOMEM;
+
+	msg->command = command;
+	msg->outsize = outsize;
+	msg->insize = insize;
+
+	if (outsize)
+		memcpy(msg->data, outdata, outsize);
+
+	ret = cros_ec_cmd_xfer_status(ec_dev, msg);
+	if (ret < 0)
+		goto error;
+
+	if (insize)
+		memcpy(indata, msg->data, insize);
+error:
+	kfree(msg);
+	return ret;
+}
+
+static void cros_usbpd_get_event_and_notify(struct device  *dev,
+					    struct cros_ec_device *ec_dev)
+{
+	struct ec_response_host_event_status host_event_status;
+	u32 event = 0;
+	int ret;
+
+	/*
+	 * We still send a 0 event out to older devices which don't
+	 * have the updated device heirarchy.
+	 */
+	if (!ec_dev) {
+		dev_dbg(dev,
+			"EC device inaccessible; sending 0 event status.\n");
+		goto send_notify;
+	}
+
+	/* Check for PD host events on EC. */
+	ret = cros_ec_pd_command(ec_dev, EC_CMD_PD_HOST_EVENT_STATUS,
+				 NULL, 0,
+				 (uint8_t *)&host_event_status,
+				 sizeof(host_event_status));
+	if (ret < 0) {
+		dev_warn(dev, "Can't get host event status (err: %d)\n", ret);
+		goto send_notify;
+	}
+
+	event = host_event_status.status;
+
+send_notify:
+	blocking_notifier_call_chain(&cros_usbpd_notifier_list, event, NULL);
+}
+
+#ifdef CONFIG_ACPI
+
+static void cros_usbpd_notify_acpi(acpi_handle device, u32 event, void *data)
+{
+	struct cros_usbpd_notify_data *pdnotify = data;
+
+	cros_usbpd_get_event_and_notify(pdnotify->dev, pdnotify->ec);
+}
+
+static int cros_usbpd_notify_probe_acpi(struct platform_device *pdev)
+{
+	struct cros_usbpd_notify_data *pdnotify;
+	struct device *dev = &pdev->dev;
+	struct acpi_device *adev;
+	struct cros_ec_device *ec_dev;
+	acpi_status status;
+
+	adev = ACPI_COMPANION(dev);
+
+	pdnotify = devm_kzalloc(dev, sizeof(*pdnotify), GFP_KERNEL);
+	if (!pdnotify)
+		return -ENOMEM;
+
+	/* Get the EC device pointer needed to talk to the EC. */
+	ec_dev = dev_get_drvdata(dev->parent);
+	if (!ec_dev) {
+		/*
+		 * We continue even for older devices which don't have the
+		 * correct device heirarchy, namely, GOOG0003 is a child
+		 * of GOOG0004.
+		 */
+		dev_warn(dev, "Couldn't get Chrome EC device pointer.\n");
+	}
+
+	pdnotify->dev = dev;
+	pdnotify->ec = ec_dev;
+
+	status = acpi_install_notify_handler(adev->handle,
+					     ACPI_ALL_NOTIFY,
+					     cros_usbpd_notify_acpi,
+					     pdnotify);
+	if (ACPI_FAILURE(status)) {
+		dev_warn(dev, "Failed to register notify handler %08x\n",
+			 status);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int cros_usbpd_notify_remove_acpi(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct acpi_device *adev = ACPI_COMPANION(dev);
+
+	acpi_remove_notify_handler(adev->handle, ACPI_ALL_NOTIFY,
+				   cros_usbpd_notify_acpi);
+
+	return 0;
+}
+
+static const struct acpi_device_id cros_usbpd_notify_acpi_device_ids[] = {
+	{ ACPI_DRV_NAME, 0 },
+	{ }
+};
+MODULE_DEVICE_TABLE(acpi, cros_usbpd_notify_acpi_device_ids);
+
+static struct platform_driver cros_usbpd_notify_acpi_driver = {
+	.driver = {
+		.name = DRV_NAME_PLAT_ACPI,
+		.acpi_match_table = cros_usbpd_notify_acpi_device_ids,
+	},
+	.probe = cros_usbpd_notify_probe_acpi,
+	.remove = cros_usbpd_notify_remove_acpi,
+};
+
+#endif /* CONFIG_ACPI */
+
+static int cros_usbpd_notify_plat(struct notifier_block *nb,
+				  unsigned long queued_during_suspend,
+				  void *data)
+{
+	struct cros_usbpd_notify_data *pdnotify = container_of(nb,
+			struct cros_usbpd_notify_data, nb);
+	struct cros_ec_device *ec_dev = (struct cros_ec_device *)data;
+	u32 host_event = cros_ec_get_host_event(ec_dev);
+
+	if (!host_event)
+		return NOTIFY_DONE;
+
+	if (host_event & EC_HOST_EVENT_MASK(EC_HOST_EVENT_PD_MCU)) {
+		cros_usbpd_get_event_and_notify(pdnotify->dev, ec_dev);
+		return NOTIFY_OK;
+	}
+	return NOTIFY_DONE;
+}
+
+static int cros_usbpd_notify_probe_plat(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct cros_ec_dev *ecdev = dev_get_drvdata(dev->parent);
+	struct cros_usbpd_notify_data *pdnotify;
+	int ret;
+
+	pdnotify = devm_kzalloc(dev, sizeof(*pdnotify), GFP_KERNEL);
+	if (!pdnotify)
+		return -ENOMEM;
+
+	pdnotify->dev = dev;
+	pdnotify->ec = ecdev->ec_dev;
+	pdnotify->nb.notifier_call = cros_usbpd_notify_plat;
+
+	dev_set_drvdata(dev, pdnotify);
+
+	ret = blocking_notifier_chain_register(&ecdev->ec_dev->event_notifier,
+					       &pdnotify->nb);
+	if (ret < 0) {
+		dev_err(dev, "Failed to register notifier\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int cros_usbpd_notify_remove_plat(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct cros_ec_dev *ecdev = dev_get_drvdata(dev->parent);
+	struct cros_usbpd_notify_data *pdnotify =
+		(struct cros_usbpd_notify_data *)dev_get_drvdata(dev);
+
+	blocking_notifier_chain_unregister(&ecdev->ec_dev->event_notifier,
+					   &pdnotify->nb);
+
+	return 0;
+}
+
+static struct platform_driver cros_usbpd_notify_plat_driver = {
+	.driver = {
+		.name = DRV_NAME,
+	},
+	.probe = cros_usbpd_notify_probe_plat,
+	.remove = cros_usbpd_notify_remove_plat,
+};
+
+static int __init cros_usbpd_notify_init(void)
+{
+	int ret;
+
+	ret = platform_driver_register(&cros_usbpd_notify_plat_driver);
+	if (ret < 0)
+		return ret;
+
+#ifdef CONFIG_ACPI
+	platform_driver_register(&cros_usbpd_notify_acpi_driver);
+#endif
+	return 0;
+}
+
+static void __exit cros_usbpd_notify_exit(void)
+{
+#ifdef CONFIG_ACPI
+	platform_driver_unregister(&cros_usbpd_notify_acpi_driver);
+#endif
+	platform_driver_unregister(&cros_usbpd_notify_plat_driver);
+}
+
+module_init(cros_usbpd_notify_init);
+module_exit(cros_usbpd_notify_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("ChromeOS power delivery notifier device");
+MODULE_AUTHOR("Jon Flatley <jflat@chromium.org>");
+MODULE_ALIAS("platform:" DRV_NAME);
diff --git a/drivers/platform/chrome/wilco_ec/event.c b/drivers/platform/chrome/wilco_ec/event.c
index dba3d445623f..814518509739 100644
--- a/drivers/platform/chrome/wilco_ec/event.c
+++ b/drivers/platform/chrome/wilco_ec/event.c
@@ -79,7 +79,7 @@ static DEFINE_IDA(event_ida);
 struct ec_event {
 	u16 size;
 	u16 type;
-	u16 event[0];
+	u16 event[];
 } __packed;
 
 #define ec_event_num_words(ev) (ev->size - 1)
@@ -96,7 +96,7 @@ struct ec_event_queue {
 	int capacity;
 	int head;
 	int tail;
-	struct ec_event *entries[0];
+	struct ec_event *entries[];
 };
 
 /* Maximum number of events to store in ec_event_queue */
diff --git a/drivers/platform/chrome/wilco_ec/properties.c b/drivers/platform/chrome/wilco_ec/properties.c
index 62f27610dd33..c2bf4c95c5d2 100644
--- a/drivers/platform/chrome/wilco_ec/properties.c
+++ b/drivers/platform/chrome/wilco_ec/properties.c
@@ -3,8 +3,11 @@
  * Copyright 2019 Google LLC
  */
 
+#include <linux/errno.h>
+#include <linux/export.h>
 #include <linux/platform_data/wilco-ec.h>
 #include <linux/string.h>
+#include <linux/types.h>
 #include <asm/unaligned.h>
 
 /* Operation code; what the EC should do with the property */
diff --git a/drivers/platform/chrome/wilco_ec/sysfs.c b/drivers/platform/chrome/wilco_ec/sysfs.c
index f0d174b6bb21..3c587b4054a5 100644
--- a/drivers/platform/chrome/wilco_ec/sysfs.c
+++ b/drivers/platform/chrome/wilco_ec/sysfs.c
@@ -8,8 +8,12 @@
  * See Documentation/ABI/testing/sysfs-platform-wilco-ec for more information.
  */
 
+#include <linux/device.h>
+#include <linux/kernel.h>
 #include <linux/platform_data/wilco-ec.h>
+#include <linux/string.h>
 #include <linux/sysfs.h>
+#include <linux/types.h>
 
 #define CMD_KB_CMOS			0x7C
 #define SUB_CMD_KB_CMOS_AUTO_ON		0x03