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SubjectRe: [PATCH 4/7] mfd: cros_ec: Get rid of cros_ec_check_features from cros_ec_dev.
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Date
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@collabora.com>
Few trivial bits inline, but more comments than anything that needs
changing.

Acked-by: Jonathan Cameron <jic23@kernel.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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