Re: [PATCH v2 2/5] mfd: cros_ec: Get rid of cros_ec_check_features from cros_ec_dev.
From: Enric Balletbo i Serra
Date: Thu Apr 20 2017 - 05:41:12 EST
On 11/04/17 11:19, Lee Jones wrote:
> On Mon, 03 Apr 2017, 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@xxxxxxxxxxxxx>
>> Acked-by: Jonathan Cameron <jic23@xxxxxxxxxx>
>> ---
>>
>> 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.
>>
>> Changes since v1:
>> - Acked-by: Jonathan Cameron <jic23@xxxxxxxxxx>
>>
>> [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 ---------------------
>
> Did you create this patch with "-M"?
>
Oops, no, will do in next version
> This also requires a drivers/platform Ack.
>
Olof, Benson, could one of you take a look at this and ack if you find this it
is ok, please?
Thanks,
Enric
>> 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;
>> -
>> 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;
>> +
>> 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)
>> +{
>> + 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];
>> };
>>
>> /**
>