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347 lines
9.0 KiB
347 lines
9.0 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) 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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#define CHANNEL_SCAN_INDEX_PRESENCE 0 |
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struct prox_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 prox_attr; |
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u32 human_presence; |
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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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}; |
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static const u32 prox_sensitivity_addresses[] = { |
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HID_USAGE_SENSOR_HUMAN_PRESENCE, |
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HID_USAGE_SENSOR_DATA_PRESENCE, |
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}; |
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/* Channel definitions */ |
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static const struct iio_chan_spec prox_channels[] = { |
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{ |
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.type = IIO_PROXIMITY, |
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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_PRESENCE, |
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} |
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}; |
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/* Adjust channel real bits based on report descriptor */ |
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static void prox_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 prox_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 prox_state *prox_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_PRESENCE: |
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report_id = prox_state->prox_attr.report_id; |
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min = prox_state->prox_attr.logical_minimum; |
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address = HID_USAGE_SENSOR_HUMAN_PRESENCE; |
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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(&prox_state->common_attributes, |
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true); |
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*val = sensor_hub_input_attr_get_raw_value( |
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prox_state->common_attributes.hsdev, |
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HID_USAGE_SENSOR_PROX, 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(&prox_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 = prox_state->scale_pre_decml; |
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*val2 = prox_state->scale_post_decml; |
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ret_type = prox_state->scale_precision; |
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break; |
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case IIO_CHAN_INFO_OFFSET: |
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*val = hid_sensor_convert_exponent( |
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prox_state->prox_attr.unit_expo); |
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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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&prox_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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&prox_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 prox_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 prox_state *prox_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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&prox_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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&prox_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 prox_info = { |
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.read_raw = &prox_read_raw, |
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.write_raw = &prox_write_raw, |
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}; |
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/* Function to push data to buffer */ |
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static void hid_sensor_push_data(struct iio_dev *indio_dev, const void *data, |
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int len) |
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{ |
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dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n"); |
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iio_push_to_buffers(indio_dev, data); |
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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 prox_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 prox_state *prox_state = iio_priv(indio_dev); |
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dev_dbg(&indio_dev->dev, "prox_proc_event\n"); |
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if (atomic_read(&prox_state->common_attributes.data_ready)) |
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hid_sensor_push_data(indio_dev, |
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&prox_state->human_presence, |
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sizeof(prox_state->human_presence)); |
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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 prox_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 prox_state *prox_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_HUMAN_PRESENCE: |
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prox_state->human_presence = *(u32 *)raw_data; |
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ret = 0; |
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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 prox_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 prox_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_HUMAN_PRESENCE, |
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&st->prox_attr); |
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if (ret < 0) |
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return ret; |
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prox_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_PRESENCE, |
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st->prox_attr.size); |
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dev_dbg(&pdev->dev, "prox %x:%x\n", st->prox_attr.index, |
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st->prox_attr.report_id); |
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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_prox_probe(struct platform_device *pdev) |
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{ |
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int ret = 0; |
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static const char *name = "prox"; |
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struct iio_dev *indio_dev; |
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struct prox_state *prox_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 prox_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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prox_state = iio_priv(indio_dev); |
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prox_state->common_attributes.hsdev = hsdev; |
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prox_state->common_attributes.pdev = pdev; |
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ret = hid_sensor_parse_common_attributes(hsdev, HID_USAGE_SENSOR_PROX, |
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&prox_state->common_attributes, |
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prox_sensitivity_addresses, |
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ARRAY_SIZE(prox_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, prox_channels, |
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sizeof(prox_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 = prox_parse_report(pdev, hsdev, |
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(struct iio_chan_spec *)indio_dev->channels, |
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HID_USAGE_SENSOR_PROX, prox_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 = ARRAY_SIZE(prox_channels); |
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indio_dev->info = &prox_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(&prox_state->common_attributes.data_ready, 0); |
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ret = hid_sensor_setup_trigger(indio_dev, name, |
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&prox_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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prox_state->callbacks.send_event = prox_proc_event; |
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prox_state->callbacks.capture_sample = prox_capture_sample; |
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prox_state->callbacks.pdev = pdev; |
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ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_PROX, |
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&prox_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, &prox_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_prox_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 prox_state *prox_state = iio_priv(indio_dev); |
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sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_PROX); |
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iio_device_unregister(indio_dev); |
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hid_sensor_remove_trigger(indio_dev, &prox_state->common_attributes); |
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return 0; |
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} |
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static const struct platform_device_id hid_prox_ids[] = { |
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{ |
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/* Format: HID-SENSOR-usage_id_in_hex_lowercase */ |
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.name = "HID-SENSOR-200011", |
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}, |
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{ /* sentinel */ } |
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}; |
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MODULE_DEVICE_TABLE(platform, hid_prox_ids); |
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static struct platform_driver hid_prox_platform_driver = { |
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.id_table = hid_prox_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_prox_probe, |
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.remove = hid_prox_remove, |
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}; |
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module_platform_driver(hid_prox_platform_driver); |
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MODULE_DESCRIPTION("HID Sensor Proximity"); |
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MODULE_AUTHOR("Archana Patni <[email protected]>"); |
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MODULE_LICENSE("GPL"); |
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MODULE_IMPORT_NS(IIO_HID);
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