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381 lines
10 KiB
381 lines
10 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* HID Sensors Driver |
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* Copyright (c) 2020, Intel Corporation. |
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*/ |
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#include <linux/hid-sensor-hub.h> |
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#include <linux/iio/buffer.h> |
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#include <linux/iio/iio.h> |
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#include <linux/platform_device.h> |
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#include <linux/module.h> |
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#include <linux/mod_devicetable.h> |
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#include "../common/hid-sensors/hid-sensor-trigger.h" |
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enum hinge_channel { |
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CHANNEL_SCAN_INDEX_HINGE_ANGLE, |
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CHANNEL_SCAN_INDEX_SCREEN_ANGLE, |
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CHANNEL_SCAN_INDEX_KEYBOARD_ANGLE, |
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CHANNEL_SCAN_INDEX_MAX, |
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}; |
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#define CHANNEL_SCAN_INDEX_TIMESTAMP CHANNEL_SCAN_INDEX_MAX |
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static const u32 hinge_addresses[CHANNEL_SCAN_INDEX_MAX] = { |
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HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE(1), |
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HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE(2), |
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HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE(3) |
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}; |
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static const char *const hinge_labels[CHANNEL_SCAN_INDEX_MAX] = { "hinge", |
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"screen", |
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"keyboard" }; |
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struct hinge_state { |
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struct iio_dev *indio_dev; |
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struct hid_sensor_hub_attribute_info hinge[CHANNEL_SCAN_INDEX_MAX]; |
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struct hid_sensor_hub_callbacks callbacks; |
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struct hid_sensor_common common_attributes; |
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const char *labels[CHANNEL_SCAN_INDEX_MAX]; |
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struct { |
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u32 hinge_val[3]; |
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u64 timestamp __aligned(8); |
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} scan; |
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int scale_pre_decml; |
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int scale_post_decml; |
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int scale_precision; |
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int value_offset; |
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u64 timestamp; |
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}; |
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static const u32 hinge_sensitivity_addresses[] = { |
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HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE(1), |
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}; |
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/* Channel definitions */ |
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static const struct iio_chan_spec hinge_channels[] = { |
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{ |
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.type = IIO_ANGL, |
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.indexed = 1, |
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.channel = 0, |
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), |
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.info_mask_shared_by_type = |
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BIT(IIO_CHAN_INFO_OFFSET) | BIT(IIO_CHAN_INFO_SCALE) | |
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BIT(IIO_CHAN_INFO_SAMP_FREQ) | BIT(IIO_CHAN_INFO_HYSTERESIS), |
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.scan_index = CHANNEL_SCAN_INDEX_HINGE_ANGLE, |
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.scan_type = { |
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.sign = 's', |
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.storagebits = 32, |
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}, |
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}, { |
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.type = IIO_ANGL, |
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.indexed = 1, |
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.channel = 1, |
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), |
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.info_mask_shared_by_type = |
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BIT(IIO_CHAN_INFO_OFFSET) | BIT(IIO_CHAN_INFO_SCALE) | |
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BIT(IIO_CHAN_INFO_SAMP_FREQ) | BIT(IIO_CHAN_INFO_HYSTERESIS), |
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.scan_index = CHANNEL_SCAN_INDEX_SCREEN_ANGLE, |
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.scan_type = { |
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.sign = 's', |
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.storagebits = 32, |
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}, |
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}, { |
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.type = IIO_ANGL, |
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.indexed = 1, |
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.channel = 2, |
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), |
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.info_mask_shared_by_type = |
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BIT(IIO_CHAN_INFO_OFFSET) | BIT(IIO_CHAN_INFO_SCALE) | |
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BIT(IIO_CHAN_INFO_SAMP_FREQ) | BIT(IIO_CHAN_INFO_HYSTERESIS), |
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.scan_index = CHANNEL_SCAN_INDEX_KEYBOARD_ANGLE, |
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.scan_type = { |
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.sign = 's', |
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.storagebits = 32, |
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}, |
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}, |
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IIO_CHAN_SOFT_TIMESTAMP(CHANNEL_SCAN_INDEX_TIMESTAMP) |
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}; |
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/* Adjust channel real bits based on report descriptor */ |
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static void hinge_adjust_channel_realbits(struct iio_chan_spec *channels, |
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int channel, int size) |
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{ |
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channels[channel].scan_type.realbits = size * 8; |
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} |
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/* Channel read_raw handler */ |
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static int hinge_read_raw(struct iio_dev *indio_dev, |
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struct iio_chan_spec const *chan, int *val, int *val2, |
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long mask) |
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{ |
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struct hinge_state *st = iio_priv(indio_dev); |
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struct hid_sensor_hub_device *hsdev; |
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int report_id; |
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s32 min; |
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hsdev = st->common_attributes.hsdev; |
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switch (mask) { |
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case IIO_CHAN_INFO_RAW: |
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hid_sensor_power_state(&st->common_attributes, true); |
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report_id = st->hinge[chan->scan_index].report_id; |
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min = st->hinge[chan->scan_index].logical_minimum; |
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if (report_id < 0) { |
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hid_sensor_power_state(&st->common_attributes, false); |
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return -EINVAL; |
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} |
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*val = sensor_hub_input_attr_get_raw_value(st->common_attributes.hsdev, |
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hsdev->usage, |
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hinge_addresses[chan->scan_index], |
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report_id, |
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SENSOR_HUB_SYNC, min < 0); |
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hid_sensor_power_state(&st->common_attributes, false); |
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return IIO_VAL_INT; |
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case IIO_CHAN_INFO_SCALE: |
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*val = st->scale_pre_decml; |
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*val2 = st->scale_post_decml; |
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return st->scale_precision; |
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case IIO_CHAN_INFO_OFFSET: |
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*val = st->value_offset; |
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return IIO_VAL_INT; |
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case IIO_CHAN_INFO_SAMP_FREQ: |
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return hid_sensor_read_samp_freq_value(&st->common_attributes, |
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val, val2); |
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case IIO_CHAN_INFO_HYSTERESIS: |
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return hid_sensor_read_raw_hyst_value(&st->common_attributes, |
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val, val2); |
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default: |
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return -EINVAL; |
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} |
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} |
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/* Channel write_raw handler */ |
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static int hinge_write_raw(struct iio_dev *indio_dev, |
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struct iio_chan_spec const *chan, int val, int val2, |
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long mask) |
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{ |
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struct hinge_state *st = iio_priv(indio_dev); |
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switch (mask) { |
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case IIO_CHAN_INFO_SAMP_FREQ: |
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return hid_sensor_write_samp_freq_value(&st->common_attributes, |
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val, val2); |
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case IIO_CHAN_INFO_HYSTERESIS: |
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return hid_sensor_write_raw_hyst_value(&st->common_attributes, |
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val, val2); |
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default: |
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return -EINVAL; |
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} |
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} |
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static int hinge_read_label(struct iio_dev *indio_dev, |
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struct iio_chan_spec const *chan, char *label) |
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{ |
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struct hinge_state *st = iio_priv(indio_dev); |
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return sprintf(label, "%s\n", st->labels[chan->channel]); |
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} |
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static const struct iio_info hinge_info = { |
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.read_raw = hinge_read_raw, |
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.write_raw = hinge_write_raw, |
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.read_label = hinge_read_label, |
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}; |
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/* |
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* Callback handler to send event after all samples are received |
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* and captured. |
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*/ |
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static int hinge_proc_event(struct hid_sensor_hub_device *hsdev, |
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unsigned int usage_id, void *priv) |
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{ |
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struct iio_dev *indio_dev = platform_get_drvdata(priv); |
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struct hinge_state *st = iio_priv(indio_dev); |
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if (atomic_read(&st->common_attributes.data_ready)) { |
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if (!st->timestamp) |
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st->timestamp = iio_get_time_ns(indio_dev); |
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iio_push_to_buffers_with_timestamp(indio_dev, &st->scan, |
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st->timestamp); |
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st->timestamp = 0; |
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} |
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return 0; |
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} |
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/* Capture samples in local storage */ |
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static int hinge_capture_sample(struct hid_sensor_hub_device *hsdev, |
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unsigned int usage_id, size_t raw_len, |
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char *raw_data, void *priv) |
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{ |
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struct iio_dev *indio_dev = platform_get_drvdata(priv); |
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struct hinge_state *st = iio_priv(indio_dev); |
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int offset; |
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switch (usage_id) { |
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case HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE(1): |
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case HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE(2): |
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case HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE(3): |
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offset = usage_id - HID_USAGE_SENSOR_DATA_FIELD_CUSTOM_VALUE(1); |
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st->scan.hinge_val[offset] = *(u32 *)raw_data; |
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return 0; |
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case HID_USAGE_SENSOR_TIME_TIMESTAMP: |
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st->timestamp = hid_sensor_convert_timestamp(&st->common_attributes, |
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*(int64_t *)raw_data); |
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return 0; |
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default: |
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return -EINVAL; |
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} |
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} |
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/* Parse report which is specific to an usage id */ |
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static int hinge_parse_report(struct platform_device *pdev, |
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struct hid_sensor_hub_device *hsdev, |
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struct iio_chan_spec *channels, |
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unsigned int usage_id, struct hinge_state *st) |
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{ |
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int ret; |
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int i; |
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for (i = 0; i < CHANNEL_SCAN_INDEX_MAX; ++i) { |
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ret = sensor_hub_input_get_attribute_info(hsdev, |
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HID_INPUT_REPORT, |
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usage_id, |
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hinge_addresses[i], |
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&st->hinge[i]); |
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if (ret < 0) |
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return ret; |
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hinge_adjust_channel_realbits(channels, i, st->hinge[i].size); |
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} |
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st->scale_precision = hid_sensor_format_scale(HID_USAGE_SENSOR_HINGE, |
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&st->hinge[CHANNEL_SCAN_INDEX_HINGE_ANGLE], |
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&st->scale_pre_decml, &st->scale_post_decml); |
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return ret; |
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} |
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/* Function to initialize the processing for usage id */ |
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static int hid_hinge_probe(struct platform_device *pdev) |
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{ |
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struct hinge_state *st; |
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struct iio_dev *indio_dev; |
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struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; |
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int ret; |
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int i; |
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indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*st)); |
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if (!indio_dev) |
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return -ENOMEM; |
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platform_set_drvdata(pdev, indio_dev); |
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st = iio_priv(indio_dev); |
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st->common_attributes.hsdev = hsdev; |
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st->common_attributes.pdev = pdev; |
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st->indio_dev = indio_dev; |
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for (i = 0; i < CHANNEL_SCAN_INDEX_MAX; i++) |
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st->labels[i] = hinge_labels[i]; |
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ret = hid_sensor_parse_common_attributes(hsdev, hsdev->usage, |
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&st->common_attributes, |
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hinge_sensitivity_addresses, |
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ARRAY_SIZE(hinge_sensitivity_addresses)); |
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if (ret) { |
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dev_err(&pdev->dev, "failed to setup common attributes\n"); |
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return ret; |
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} |
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indio_dev->num_channels = ARRAY_SIZE(hinge_channels); |
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indio_dev->channels = devm_kmemdup(&indio_dev->dev, hinge_channels, |
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sizeof(hinge_channels), GFP_KERNEL); |
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if (!indio_dev->channels) |
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return -ENOMEM; |
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ret = hinge_parse_report(pdev, hsdev, |
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(struct iio_chan_spec *)indio_dev->channels, |
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hsdev->usage, st); |
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if (ret) { |
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dev_err(&pdev->dev, "failed to setup attributes\n"); |
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return ret; |
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} |
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indio_dev->info = &hinge_info; |
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indio_dev->name = "hinge"; |
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indio_dev->modes = INDIO_DIRECT_MODE; |
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atomic_set(&st->common_attributes.data_ready, 0); |
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ret = hid_sensor_setup_trigger(indio_dev, indio_dev->name, |
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&st->common_attributes); |
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if (ret < 0) { |
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dev_err(&pdev->dev, "trigger setup failed\n"); |
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return ret; |
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} |
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st->callbacks.send_event = hinge_proc_event; |
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st->callbacks.capture_sample = hinge_capture_sample; |
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st->callbacks.pdev = pdev; |
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ret = sensor_hub_register_callback(hsdev, hsdev->usage, &st->callbacks); |
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if (ret < 0) { |
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dev_err(&pdev->dev, "callback reg failed\n"); |
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goto error_remove_trigger; |
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} |
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ret = iio_device_register(indio_dev); |
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if (ret) { |
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dev_err(&pdev->dev, "device register failed\n"); |
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goto error_remove_callback; |
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} |
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return ret; |
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error_remove_callback: |
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sensor_hub_remove_callback(hsdev, hsdev->usage); |
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error_remove_trigger: |
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hid_sensor_remove_trigger(indio_dev, &st->common_attributes); |
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return ret; |
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} |
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/* Function to deinitialize the processing for usage id */ |
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static int hid_hinge_remove(struct platform_device *pdev) |
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{ |
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struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data; |
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struct iio_dev *indio_dev = platform_get_drvdata(pdev); |
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struct hinge_state *st = iio_priv(indio_dev); |
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iio_device_unregister(indio_dev); |
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sensor_hub_remove_callback(hsdev, hsdev->usage); |
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hid_sensor_remove_trigger(indio_dev, &st->common_attributes); |
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return 0; |
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} |
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static const struct platform_device_id hid_hinge_ids[] = { |
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{ |
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/* Format: HID-SENSOR-INT-usage_id_in_hex_lowercase */ |
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.name = "HID-SENSOR-INT-020b", |
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}, |
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{ /* sentinel */ } |
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}; |
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MODULE_DEVICE_TABLE(platform, hid_hinge_ids); |
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static struct platform_driver hid_hinge_platform_driver = { |
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.id_table = hid_hinge_ids, |
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.driver = { |
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.name = KBUILD_MODNAME, |
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.pm = &hid_sensor_pm_ops, |
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}, |
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.probe = hid_hinge_probe, |
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.remove = hid_hinge_remove, |
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}; |
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module_platform_driver(hid_hinge_platform_driver); |
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MODULE_DESCRIPTION("HID Sensor INTEL Hinge"); |
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MODULE_AUTHOR("Ye Xiang <[email protected]>"); |
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MODULE_LICENSE("GPL"); |
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MODULE_IMPORT_NS(IIO_HID);
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