382 lines
10 KiB
C
382 lines
10 KiB
C
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// 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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}
|
||
|
|
|
||
|
|
static const struct platform_device_id hid_hinge_ids[] = {
|
||
|
|
{
|
||
|
|
/* Format: HID-SENSOR-INT-usage_id_in_hex_lowercase */
|
||
|
|
.name = "HID-SENSOR-INT-020b",
|
||
|
|
},
|
||
|
|
{ /* sentinel */ }
|
||
|
|
};
|
||
|
|
MODULE_DEVICE_TABLE(platform, hid_hinge_ids);
|
||
|
|
|
||
|
|
static struct platform_driver hid_hinge_platform_driver = {
|
||
|
|
.id_table = hid_hinge_ids,
|
||
|
|
.driver = {
|
||
|
|
.name = KBUILD_MODNAME,
|
||
|
|
.pm = &hid_sensor_pm_ops,
|
||
|
|
},
|
||
|
|
.probe = hid_hinge_probe,
|
||
|
|
.remove = hid_hinge_remove,
|
||
|
|
};
|
||
|
|
module_platform_driver(hid_hinge_platform_driver);
|
||
|
|
|
||
|
|
MODULE_DESCRIPTION("HID Sensor INTEL Hinge");
|
||
|
|
MODULE_AUTHOR("Ye Xiang <xiang.ye@intel.com>");
|
||
|
|
MODULE_LICENSE("GPL");
|
||
|
|
MODULE_IMPORT_NS(IIO_HID);
|