Message-ID: <8503bbd4-85b6-9a46-8ada-84e7332162d8@kernel.org>
Date:   Sat, 25 Mar 2017 15:22:41 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Lee Jones <lee.jones@...aro.org>,
        Olof Johansson <olof@...om.net>, bleung@...omium.org
Cc:     martinez.javier@...il.com, Guenter Roeck <groeck@...omium.org>,
        Gwendal Grignou <gwendal@...omium.org>,
        linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org,
        rtc-linux@...glegroups.com
Subject: Re: [PATCH 4/7] mfd: cros_ec: Get rid of cros_ec_check_features from
 cros_ec_dev.

On 24/03/17 17:44, Enric Balletbo i Serra wrote:
> The cros_ec_dev driver should be used only to expose the Chrome OS Embedded
> Controller to user-space and should not be used to add MFD devices by
> calling mfd_add_devices. This patch moves this logic to the MFD cros_ec
> driver and removes the MFD bits from the character device driver. Also
> makes independent the IIO driver from the character device as also has no
> sense.
> 
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
Few trivial bits inline, but more comments than anything that needs
changing.

Acked-by: Jonathan Cameron <jic23@...nel.org>

Lee, so who gets to do the immutable branch for this one?

> ---
> 
>   As pointed by Lee Jones in this thread [1] we should not use the MFD API
> outside of MFD. For this reason the cros-ec-rtc did not get accepted yet.
> The reality is that we are calling mfd_add_devices from cros-ec-dev driver
> already, so this patch get rid off the MFD calls inside the chardev driver
> and moves to cros-ec MFD. Also I think the chardev device should simply
> implement the ioctl calls to access to it from userspace.
> 
> [1]  https://www.spinics.net/lists/kernel/msg2465099.html
> 
>  .../iio/common/cros_ec_sensors/cros_ec_sensors.c   |   8 -
>  .../common/cros_ec_sensors/cros_ec_sensors_core.c  |   8 +-
>  drivers/iio/light/cros_ec_light_prox.c             |   8 -
>  drivers/iio/pressure/cros_ec_baro.c                |   8 -
>  drivers/mfd/cros_ec.c                              | 160 ++++++++++++++++++++
>  drivers/platform/chrome/cros_ec_dev.c              | 161 ---------------------
>  include/linux/mfd/cros_ec.h                        |   6 +-
>  7 files changed, 170 insertions(+), 189 deletions(-)
> 
> diff --git a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
> index 38e8783..9b53a01 100644
> --- a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
> +++ b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
> @@ -191,19 +191,11 @@ static const struct iio_info ec_sensors_info = {
>  static int cros_ec_sensors_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
> -	struct cros_ec_dev *ec_dev = dev_get_drvdata(dev->parent);
> -	struct cros_ec_device *ec_device;
>  	struct iio_dev *indio_dev;
>  	struct cros_ec_sensors_state *state;
>  	struct iio_chan_spec *channel;
>  	int ret, i;
>  
> -	if (!ec_dev || !ec_dev->ec_dev) {
> -		dev_warn(&pdev->dev, "No CROS EC device found.\n");
> -		return -EINVAL;
> -	}
> -	ec_device = ec_dev->ec_dev;
> -
Huh, not sure why this hasn't been throwing warnings as ec_device is
never used for anything.  Ah well, good to clean it up ;)

>  	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*state));
>  	if (!indio_dev)
>  		return -ENOMEM;
> diff --git a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
> index 416cae5..0cdb64a 100644
> --- a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
> +++ b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
> @@ -41,12 +41,13 @@ int cros_ec_sensors_core_init(struct platform_device *pdev,
>  {
>  	struct device *dev = &pdev->dev;
>  	struct cros_ec_sensors_core_state *state = iio_priv(indio_dev);
> -	struct cros_ec_dev *ec = dev_get_drvdata(pdev->dev.parent);
> +	struct cros_ec_device *ec_dev = dev_get_drvdata(pdev->dev.parent);
>  	struct cros_ec_sensor_platform *sensor_platform = dev_get_platdata(dev);
>  
>  	platform_set_drvdata(pdev, indio_dev);
>  
> -	state->ec = ec->ec_dev;
> +	state->ec = ec_dev;
> +
If really going for the nitpick. Blank line doesn't really add anything...
>  	state->msg = devm_kzalloc(&pdev->dev,
>  				max((u16)sizeof(struct ec_params_motion_sense),
>  				state->ec->max_response), GFP_KERNEL);
> @@ -59,7 +60,8 @@ int cros_ec_sensors_core_init(struct platform_device *pdev,
>  
>  	/* Set up the host command structure. */
>  	state->msg->version = 2;
> -	state->msg->command = EC_CMD_MOTION_SENSE_CMD + ec->cmd_offset;
> +	state->msg->command = EC_CMD_MOTION_SENSE_CMD +
> +				sensor_platform->cmd_offset;
>  	state->msg->outsize = sizeof(struct ec_params_motion_sense);
>  
>  	indio_dev->dev.parent = &pdev->dev;
> diff --git a/drivers/iio/light/cros_ec_light_prox.c b/drivers/iio/light/cros_ec_light_prox.c
> index 7217223..2133ddc 100644
> --- a/drivers/iio/light/cros_ec_light_prox.c
> +++ b/drivers/iio/light/cros_ec_light_prox.c
> @@ -181,19 +181,11 @@ static const struct iio_info cros_ec_light_prox_info = {
>  static int cros_ec_light_prox_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
> -	struct cros_ec_dev *ec_dev = dev_get_drvdata(dev->parent);
> -	struct cros_ec_device *ec_device;
>  	struct iio_dev *indio_dev;
>  	struct cros_ec_light_prox_state *state;
>  	struct iio_chan_spec *channel;
>  	int ret;
>  
> -	if (!ec_dev || !ec_dev->ec_dev) {
> -		dev_warn(dev, "No CROS EC device found.\n");
> -		return -EINVAL;
> -	}
> -	ec_device = ec_dev->ec_dev;
> -
>  	indio_dev = devm_iio_device_alloc(dev, sizeof(*state));
>  	if (!indio_dev)
>  		return -ENOMEM;
> diff --git a/drivers/iio/pressure/cros_ec_baro.c b/drivers/iio/pressure/cros_ec_baro.c
> index 48b2a30..dbea18b 100644
> --- a/drivers/iio/pressure/cros_ec_baro.c
> +++ b/drivers/iio/pressure/cros_ec_baro.c
> @@ -126,19 +126,11 @@ static const struct iio_info cros_ec_baro_info = {
>  static int cros_ec_baro_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
> -	struct cros_ec_dev *ec_dev = dev_get_drvdata(dev->parent);
> -	struct cros_ec_device *ec_device;
>  	struct iio_dev *indio_dev;
>  	struct cros_ec_baro_state *state;
>  	struct iio_chan_spec *channel;
>  	int ret;
>  
> -	if (!ec_dev || !ec_dev->ec_dev) {
> -		dev_warn(dev, "No CROS EC device found.\n");
> -		return -EINVAL;
> -	}
> -	ec_device = ec_dev->ec_dev;
> -
>  	indio_dev = devm_iio_device_alloc(dev, sizeof(*state));
>  	if (!indio_dev)
>  		return -ENOMEM;
> diff --git a/drivers/mfd/cros_ec.c b/drivers/mfd/cros_ec.c
> index d4a407e..bbc17ab 100644
> --- a/drivers/mfd/cros_ec.c
> +++ b/drivers/mfd/cros_ec.c
> @@ -84,6 +84,160 @@ static int cros_ec_sleep_event(struct cros_ec_device *ec_dev, u8 sleep_event)
>  	return cros_ec_cmd_xfer(ec_dev, &buf.msg);
>  }
>  
> +static int cros_ec_check_features(struct cros_ec_device *ec_dev, int feature)
> +{
Fair enough on the parameter rename. Slightly better this way...
Absolute ideal would have been a separate rename patch then this one, but
this is fine...
> +	struct cros_ec_command *msg;
> +	int ret;
> +
> +	if (ec_dev->features[0] == -1U && ec_dev->features[1] == -1U) {
> +		/* features bitmap not read yet */
> +
> +		msg = kmalloc(sizeof(*msg) + sizeof(ec_dev->features),
> +			      GFP_KERNEL);
> +		if (!msg)
> +			return -ENOMEM;
> +
> +		msg->version = 0;
> +		msg->command = EC_CMD_GET_FEATURES + ec_p.cmd_offset;
> +		msg->insize = sizeof(ec_dev->features);
> +		msg->outsize = 0;
> +
> +		ret = cros_ec_cmd_xfer(ec_dev, msg);
> +		if (ret < 0 || msg->result != EC_RES_SUCCESS) {
> +			dev_warn(ec_dev->dev, "cannot get EC features: %d/%d\n",
> +				 ret, msg->result);
> +			memset(ec_dev->features, 0, sizeof(ec_dev->features));
> +		}
> +
> +		memcpy(ec_dev->features, msg->data, sizeof(ec_dev->features));
> +
> +		dev_dbg(ec_dev->dev, "EC features %08x %08x\n",
> +			ec_dev->features[0], ec_dev->features[1]);
> +
> +		kfree(msg);
> +	}
> +
> +	return ec_dev->features[feature / 32] & EC_FEATURE_MASK_0(feature);
> +}
> +
> +static void cros_ec_sensors_register(struct cros_ec_device *ec_dev)
> +{
> +	/*
> +	 * Issue a command to get the number of sensor reported.
> +	 * Build an array of sensors driver and register them all.
> +	 */
> +	int ret, i, id, sensor_num;
> +	struct mfd_cell *sensor_cells;
> +	struct cros_ec_sensor_platform *sensor_platforms;
> +	int sensor_type[MOTIONSENSE_TYPE_MAX];
> +	struct ec_params_motion_sense *params;
> +	struct ec_response_motion_sense *resp;
> +	struct cros_ec_command *msg;
> +
> +	msg = kzalloc(sizeof(struct cros_ec_command) +
> +		      max(sizeof(*params), sizeof(*resp)), GFP_KERNEL);
> +	if (msg == NULL)
> +		return;
> +
> +	msg->version = 2;
> +	msg->command = EC_CMD_MOTION_SENSE_CMD + ec_p.cmd_offset;
> +	msg->outsize = sizeof(*params);
> +	msg->insize = sizeof(*resp);
> +
> +	params = (struct ec_params_motion_sense *)msg->data;
> +	params->cmd = MOTIONSENSE_CMD_DUMP;
> +
> +	ret = cros_ec_cmd_xfer(ec_dev, msg);
> +	if (ret < 0 || msg->result != EC_RES_SUCCESS) {
> +		dev_warn(ec_dev->dev, "cannot get EC sensor information: %d/%d\n",
> +			 ret, msg->result);
> +		goto error;
> +	}
> +
> +	resp = (struct ec_response_motion_sense *)msg->data;
> +	sensor_num = resp->dump.sensor_count;
> +	/* Allocate 2 extra sensors in case lid angle or FIFO are needed */
> +	sensor_cells = kzalloc(sizeof(struct mfd_cell) * (sensor_num + 2),
> +			       GFP_KERNEL);
> +	if (sensor_cells == NULL)
> +		goto error;
> +
> +	sensor_platforms = kzalloc(sizeof(struct cros_ec_sensor_platform) *
> +		  (sensor_num + 1), GFP_KERNEL);
> +	if (sensor_platforms == NULL)
> +		goto error_platforms;
> +
> +	memset(sensor_type, 0, sizeof(sensor_type));
> +	id = 0;
> +	for (i = 0; i < sensor_num; i++) {
> +		params->cmd = MOTIONSENSE_CMD_INFO;
> +		params->info.sensor_num = i;
> +		ret = cros_ec_cmd_xfer(ec_dev, msg);
> +		if (ret < 0 || msg->result != EC_RES_SUCCESS) {
> +			dev_warn(ec_dev->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(ec_dev->dev, "unknown type %d\n",
> +				 resp->info.type);
> +			continue;
> +		}
> +		sensor_platforms[id].sensor_num = i;
> +		sensor_platforms[id].cmd_offset = ec_p.cmd_offset;
> +		sensor_cells[id].id = sensor_type[resp->info.type];
> +		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) {
> +		sensor_platforms[id].sensor_num = sensor_num;
> +
> +		sensor_cells[id].name = "cros-ec-angle";
> +		sensor_cells[id].id = 0;
> +		sensor_cells[id].platform_data = &sensor_platforms[id];
> +		sensor_cells[id].pdata_size =
> +			sizeof(struct cros_ec_sensor_platform);
> +		id++;
> +	}
> +
> +	ret = mfd_add_devices(ec_dev->dev, PLATFORM_DEVID_AUTO, sensor_cells,
> +			      id, NULL, 0, NULL);
> +	if (ret)
> +		dev_err(ec_dev->dev, "failed to add EC sensors\n");
> +
> +	kfree(sensor_platforms);
> +error_platforms:
> +	kfree(sensor_cells);
> +error:
> +	kfree(msg);
> +}
> +
>  int cros_ec_register(struct cros_ec_device *ec_dev)
>  {
>  	struct device *dev = ec_dev->dev;
> @@ -94,6 +248,8 @@ int cros_ec_register(struct cros_ec_device *ec_dev)
>  	ec_dev->max_request = sizeof(struct ec_params_hello);
>  	ec_dev->max_response = sizeof(struct ec_response_get_protocol_info);
>  	ec_dev->max_passthru = 0;
> +	ec_dev->features[0] = -1U; /* Not cached yet */
> +	ec_dev->features[1] = -1U; /* Not cached yet */
>  
>  	ec_dev->din = devm_kzalloc(dev, ec_dev->din_size, GFP_KERNEL);
>  	if (!ec_dev->din)
> @@ -127,6 +283,10 @@ int cros_ec_register(struct cros_ec_device *ec_dev)
>  		goto fail_mfd;
>  	}
>  
> +	/* Check whether this EC is a sensor hub. */
> +	if (cros_ec_check_features(ec_dev, EC_FEATURE_MOTION_SENSE))
> +		cros_ec_sensors_register(ec_dev);
> +
>  	if (ec_dev->max_passthru) {
>  		/*
>  		 * Register a PD device as well on top of this device.
> diff --git a/drivers/platform/chrome/cros_ec_dev.c b/drivers/platform/chrome/cros_ec_dev.c
> index b9bf086..4947650 100644
> --- a/drivers/platform/chrome/cros_ec_dev.c
> +++ b/drivers/platform/chrome/cros_ec_dev.c
> @@ -90,41 +90,6 @@ static int ec_get_version(struct cros_ec_dev *ec, char *str, int maxlen)
>  	return ret;
>  }
>  
> -static int cros_ec_check_features(struct cros_ec_dev *ec, int feature)
> -{
> -	struct cros_ec_command *msg;
> -	int ret;
> -
> -	if (ec->features[0] == -1U && ec->features[1] == -1U) {
> -		/* features bitmap not read yet */
> -
> -		msg = kmalloc(sizeof(*msg) + sizeof(ec->features), GFP_KERNEL);
> -		if (!msg)
> -			return -ENOMEM;
> -
> -		msg->version = 0;
> -		msg->command = EC_CMD_GET_FEATURES + ec->cmd_offset;
> -		msg->insize = sizeof(ec->features);
> -		msg->outsize = 0;
> -
> -		ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
> -		if (ret < 0 || msg->result != EC_RES_SUCCESS) {
> -			dev_warn(ec->dev, "cannot get EC features: %d/%d\n",
> -				 ret, msg->result);
> -			memset(ec->features, 0, sizeof(ec->features));
> -		}
> -
> -		memcpy(ec->features, msg->data, sizeof(ec->features));
> -
> -		dev_dbg(ec->dev, "EC features %08x %08x\n",
> -			ec->features[0], ec->features[1]);
> -
> -		kfree(msg);
> -	}
> -
> -	return ec->features[feature / 32] & EC_FEATURE_MASK_0(feature);
> -}
> -
>  /* Device file ops */
>  static int ec_device_open(struct inode *inode, struct file *filp)
>  {
> @@ -268,126 +233,6 @@ static void __remove(struct device *dev)
>  	kfree(ec);
>  }
>  
> -static void cros_ec_sensors_register(struct cros_ec_dev *ec)
> -{
> -	/*
> -	 * Issue a command to get the number of sensor reported.
> -	 * Build an array of sensors driver and register them all.
> -	 */
> -	int ret, i, id, sensor_num;
> -	struct mfd_cell *sensor_cells;
> -	struct cros_ec_sensor_platform *sensor_platforms;
> -	int sensor_type[MOTIONSENSE_TYPE_MAX];
> -	struct ec_params_motion_sense *params;
> -	struct ec_response_motion_sense *resp;
> -	struct cros_ec_command *msg;
> -
> -	msg = kzalloc(sizeof(struct cros_ec_command) +
> -		      max(sizeof(*params), sizeof(*resp)), GFP_KERNEL);
> -	if (msg == NULL)
> -		return;
> -
> -	msg->version = 2;
> -	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;
> -	params->cmd = MOTIONSENSE_CMD_DUMP;
> -
> -	ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
> -	if (ret < 0 || msg->result != EC_RES_SUCCESS) {
> -		dev_warn(ec->dev, "cannot get EC sensor information: %d/%d\n",
> -			 ret, msg->result);
> -		goto error;
> -	}
> -
> -	resp = (struct ec_response_motion_sense *)msg->data;
> -	sensor_num = resp->dump.sensor_count;
> -	/* Allocate 2 extra sensors in case lid angle or FIFO are needed */
> -	sensor_cells = kzalloc(sizeof(struct mfd_cell) * (sensor_num + 2),
> -			       GFP_KERNEL);
> -	if (sensor_cells == NULL)
> -		goto error;
> -
> -	sensor_platforms = kzalloc(sizeof(struct cros_ec_sensor_platform) *
> -		  (sensor_num + 1), GFP_KERNEL);
> -	if (sensor_platforms == NULL)
> -		goto error_platforms;
> -
> -	memset(sensor_type, 0, sizeof(sensor_type));
> -	id = 0;
> -	for (i = 0; i < sensor_num; i++) {
> -		params->cmd = MOTIONSENSE_CMD_INFO;
> -		params->info.sensor_num = i;
> -		ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
> -		if (ret < 0 || msg->result != EC_RES_SUCCESS) {
> -			dev_warn(ec->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(ec->dev, "unknown type %d\n", resp->info.type);
> -			continue;
> -		}
> -		sensor_platforms[id].sensor_num = i;
> -		sensor_cells[id].id = sensor_type[resp->info.type];
> -		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) {
> -		sensor_platforms[id].sensor_num = sensor_num;
> -
> -		sensor_cells[id].name = "cros-ec-angle";
> -		sensor_cells[id].id = 0;
> -		sensor_cells[id].platform_data = &sensor_platforms[id];
> -		sensor_cells[id].pdata_size =
> -			sizeof(struct cros_ec_sensor_platform);
> -		id++;
> -	}
> -	if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE_FIFO)) {
> -		sensor_cells[id].name = "cros-ec-ring";
> -		id++;
> -	}
> -
> -	ret = mfd_add_devices(ec->dev, 0, sensor_cells, id,
> -			      NULL, 0, NULL);
> -	if (ret)
> -		dev_err(ec->dev, "failed to add EC sensors\n");
> -
> -	kfree(sensor_platforms);
> -error_platforms:
> -	kfree(sensor_cells);
> -error:
> -	kfree(msg);
> -}
> -
>  static int ec_device_probe(struct platform_device *pdev)
>  {
>  	int retval = -ENOMEM;
> @@ -402,8 +247,6 @@ static int ec_device_probe(struct platform_device *pdev)
>  	ec->ec_dev = dev_get_drvdata(dev->parent);
>  	ec->dev = dev;
>  	ec->cmd_offset = ec_platform->cmd_offset;
> -	ec->features[0] = -1U; /* Not cached yet */
> -	ec->features[1] = -1U; /* Not cached yet */
>  	device_initialize(&ec->class_dev);
>  	cdev_init(&ec->cdev, &fops);
>  
> @@ -432,10 +275,6 @@ static int ec_device_probe(struct platform_device *pdev)
>  	if (cros_ec_debugfs_init(ec))
>  		dev_warn(dev, "failed to create debugfs directory\n");
>  
> -	/* check whether this EC is a sensor hub. */
> -	if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE))
> -		cros_ec_sensors_register(ec);
> -
>  	/* Take control of the lightbar from the EC. */
>  	lb_manual_suspend_ctrl(ec, 1);
>  
> diff --git a/include/linux/mfd/cros_ec.h b/include/linux/mfd/cros_ec.h
> index 3b16c90..8f87999 100644
> --- a/include/linux/mfd/cros_ec.h
> +++ b/include/linux/mfd/cros_ec.h
> @@ -115,6 +115,7 @@ struct cros_ec_command {
>   * @event_notifier: interrupt event notifier for transport devices.
>   * @event_data: raw payload transferred with the MKBP event.
>   * @event_size: size in bytes of the event data.
> + * @features: stores the EC features.
>   */
>  struct cros_ec_device {
>  
> @@ -149,15 +150,19 @@ struct cros_ec_device {
>  
>  	struct ec_response_get_next_event event_data;
>  	int event_size;
> +	u32 features[2];
>  };
>  
>  /**
>   * struct cros_ec_sensor_platform - ChromeOS EC sensor platform information
>   *
>   * @sensor_num: Id of the sensor, as reported by the EC.
> + * @cmd_offset: offset to apply for each command. Set when
> + * registering a devicde behind another one.
>   */
>  struct cros_ec_sensor_platform {
>  	u8 sensor_num;
> +	u16 cmd_offset;
>  };
>  
>  /* struct cros_ec_platform - ChromeOS EC platform information
> @@ -191,7 +196,6 @@ struct cros_ec_dev {
>  	struct device *dev;
>  	struct cros_ec_debugfs *debug_info;
>  	u16 cmd_offset;
> -	u32 features[2];
>  };
>  
>  /**
> 

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