363 lines
9.5 KiB
C
363 lines
9.5 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) 2014, Intel Corporation.
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*/
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#include <linux/device.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 <linux/slab.h>
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#include <linux/hid-sensor-hub.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/buffer.h>
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#include "../common/hid-sensors/hid-sensor-trigger.h"
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enum {
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CHANNEL_SCAN_INDEX_PRESSURE,
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CHANNEL_SCAN_INDEX_TIMESTAMP,
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};
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struct press_state {
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struct hid_sensor_hub_callbacks callbacks;
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struct hid_sensor_common common_attributes;
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struct hid_sensor_hub_attribute_info press_attr;
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struct {
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u32 press_data;
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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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s64 timestamp;
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};
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static const u32 press_sensitivity_addresses[] = {
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HID_USAGE_SENSOR_DATA_ATMOSPHERIC_PRESSURE,
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HID_USAGE_SENSOR_ATMOSPHERIC_PRESSURE
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};
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/* Channel definitions */
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static const struct iio_chan_spec press_channels[] = {
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{
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.type = IIO_PRESSURE,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
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BIT(IIO_CHAN_INFO_SCALE) |
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BIT(IIO_CHAN_INFO_SAMP_FREQ) |
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BIT(IIO_CHAN_INFO_HYSTERESIS),
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.scan_index = CHANNEL_SCAN_INDEX_PRESSURE,
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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 press_adjust_channel_bit_mask(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.sign = 's';
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/* Real storage bits will change based on the report desc. */
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channels[channel].scan_type.realbits = size * 8;
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/* Maximum size of a sample to capture is u32 */
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channels[channel].scan_type.storagebits = sizeof(u32) * 8;
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}
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/* Channel read_raw handler */
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static int press_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val, int *val2,
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long mask)
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{
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struct press_state *press_state = iio_priv(indio_dev);
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int report_id = -1;
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u32 address;
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int ret_type;
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s32 min;
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*val = 0;
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*val2 = 0;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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switch (chan->scan_index) {
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case CHANNEL_SCAN_INDEX_PRESSURE:
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report_id = press_state->press_attr.report_id;
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min = press_state->press_attr.logical_minimum;
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address = HID_USAGE_SENSOR_ATMOSPHERIC_PRESSURE;
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break;
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default:
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report_id = -1;
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break;
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}
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if (report_id >= 0) {
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hid_sensor_power_state(&press_state->common_attributes,
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true);
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*val = sensor_hub_input_attr_get_raw_value(
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press_state->common_attributes.hsdev,
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HID_USAGE_SENSOR_PRESSURE, address,
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report_id,
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SENSOR_HUB_SYNC,
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min < 0);
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hid_sensor_power_state(&press_state->common_attributes,
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false);
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} else {
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*val = 0;
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return -EINVAL;
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}
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ret_type = IIO_VAL_INT;
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break;
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case IIO_CHAN_INFO_SCALE:
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*val = press_state->scale_pre_decml;
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*val2 = press_state->scale_post_decml;
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ret_type = press_state->scale_precision;
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break;
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case IIO_CHAN_INFO_OFFSET:
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*val = press_state->value_offset;
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ret_type = IIO_VAL_INT;
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break;
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case IIO_CHAN_INFO_SAMP_FREQ:
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ret_type = hid_sensor_read_samp_freq_value(
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&press_state->common_attributes, val, val2);
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break;
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case IIO_CHAN_INFO_HYSTERESIS:
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ret_type = hid_sensor_read_raw_hyst_value(
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&press_state->common_attributes, val, val2);
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break;
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default:
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ret_type = -EINVAL;
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break;
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}
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return ret_type;
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}
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/* Channel write_raw handler */
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static int press_write_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int val,
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int val2,
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long mask)
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{
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struct press_state *press_state = iio_priv(indio_dev);
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int ret = 0;
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switch (mask) {
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case IIO_CHAN_INFO_SAMP_FREQ:
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ret = hid_sensor_write_samp_freq_value(
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&press_state->common_attributes, val, val2);
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break;
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case IIO_CHAN_INFO_HYSTERESIS:
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ret = hid_sensor_write_raw_hyst_value(
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&press_state->common_attributes, val, val2);
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break;
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default:
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ret = -EINVAL;
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}
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return ret;
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}
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static const struct iio_info press_info = {
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.read_raw = &press_read_raw,
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.write_raw = &press_write_raw,
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};
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/* Callback handler to send event after all samples are received and captured */
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static int press_proc_event(struct hid_sensor_hub_device *hsdev,
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unsigned usage_id,
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void *priv)
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{
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struct iio_dev *indio_dev = platform_get_drvdata(priv);
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struct press_state *press_state = iio_priv(indio_dev);
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dev_dbg(&indio_dev->dev, "press_proc_event\n");
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if (atomic_read(&press_state->common_attributes.data_ready)) {
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if (!press_state->timestamp)
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press_state->timestamp = iio_get_time_ns(indio_dev);
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iio_push_to_buffers_with_timestamp(
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indio_dev, &press_state->scan, press_state->timestamp);
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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 press_capture_sample(struct hid_sensor_hub_device *hsdev,
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unsigned usage_id,
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size_t raw_len, char *raw_data,
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void *priv)
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{
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struct iio_dev *indio_dev = platform_get_drvdata(priv);
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struct press_state *press_state = iio_priv(indio_dev);
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int ret = -EINVAL;
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switch (usage_id) {
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case HID_USAGE_SENSOR_ATMOSPHERIC_PRESSURE:
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press_state->scan.press_data = *(u32 *)raw_data;
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ret = 0;
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break;
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case HID_USAGE_SENSOR_TIME_TIMESTAMP:
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press_state->timestamp = hid_sensor_convert_timestamp(
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&press_state->common_attributes, *(s64 *)raw_data);
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break;
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default:
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break;
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}
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return ret;
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}
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/* Parse report which is specific to an usage id*/
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static int press_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 usage_id,
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struct press_state *st)
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{
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int ret;
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ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT,
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usage_id,
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HID_USAGE_SENSOR_ATMOSPHERIC_PRESSURE,
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&st->press_attr);
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if (ret < 0)
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return ret;
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press_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_PRESSURE,
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st->press_attr.size);
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dev_dbg(&pdev->dev, "press %x:%x\n", st->press_attr.index,
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st->press_attr.report_id);
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st->scale_precision = hid_sensor_format_scale(
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HID_USAGE_SENSOR_PRESSURE,
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&st->press_attr,
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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_press_probe(struct platform_device *pdev)
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{
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int ret = 0;
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static const char *name = "press";
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struct iio_dev *indio_dev;
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struct press_state *press_state;
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struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
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indio_dev = devm_iio_device_alloc(&pdev->dev,
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sizeof(struct press_state));
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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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press_state = iio_priv(indio_dev);
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press_state->common_attributes.hsdev = hsdev;
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press_state->common_attributes.pdev = pdev;
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ret = hid_sensor_parse_common_attributes(hsdev,
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HID_USAGE_SENSOR_PRESSURE,
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&press_state->common_attributes,
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press_sensitivity_addresses,
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ARRAY_SIZE(press_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->channels = devm_kmemdup(&pdev->dev, press_channels,
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sizeof(press_channels), GFP_KERNEL);
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if (!indio_dev->channels) {
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dev_err(&pdev->dev, "failed to duplicate channels\n");
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return -ENOMEM;
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}
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ret = press_parse_report(pdev, hsdev,
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(struct iio_chan_spec *)indio_dev->channels,
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HID_USAGE_SENSOR_PRESSURE, press_state);
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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->num_channels =
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ARRAY_SIZE(press_channels);
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indio_dev->info = &press_info;
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indio_dev->name = name;
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indio_dev->modes = INDIO_DIRECT_MODE;
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atomic_set(&press_state->common_attributes.data_ready, 0);
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ret = hid_sensor_setup_trigger(indio_dev, name,
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&press_state->common_attributes);
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if (ret) {
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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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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_trigger;
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}
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press_state->callbacks.send_event = press_proc_event;
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press_state->callbacks.capture_sample = press_capture_sample;
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press_state->callbacks.pdev = pdev;
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ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_PRESSURE,
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&press_state->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_iio_unreg;
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}
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return ret;
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error_iio_unreg:
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iio_device_unregister(indio_dev);
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error_remove_trigger:
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hid_sensor_remove_trigger(indio_dev, &press_state->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_press_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 press_state *press_state = iio_priv(indio_dev);
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sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_PRESSURE);
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iio_device_unregister(indio_dev);
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hid_sensor_remove_trigger(indio_dev, &press_state->common_attributes);
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return 0;
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}
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static const struct platform_device_id hid_press_ids[] = {
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{
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/* Format: HID-SENSOR-usage_id_in_hex_lowercase */
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.name = "HID-SENSOR-200031",
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},
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(platform, hid_press_ids);
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static struct platform_driver hid_press_platform_driver = {
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.id_table = hid_press_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_press_probe,
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.remove = hid_press_remove,
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};
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module_platform_driver(hid_press_platform_driver);
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MODULE_DESCRIPTION("HID Sensor Pressure");
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MODULE_AUTHOR("Archana Patni <archana.patni@intel.com>");
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MODULE_LICENSE("GPL");
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MODULE_IMPORT_NS(IIO_HID);
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