linux/drivers/iio/pressure/hid-sensor-press.c
Ye Xiang 3304d2b69a iio: hid-sensor-press: Add timestamp channel
Each sample has a timestamp field with this change. This timestamp may
be from the sensor hub when present or local kernel timestamp. The
unit of timestamp is nanosecond.

Signed-off-by: Ye Xiang <xiang.ye@intel.com>
Link: https://lore.kernel.org/r/20210731032556.26813-1-xiang.ye@intel.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2021-08-09 20:17:36 +01:00

363 lines
9.5 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* HID Sensors Driver
* Copyright (c) 2014, Intel Corporation.
*/
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/slab.h>
#include <linux/hid-sensor-hub.h>
#include <linux/iio/iio.h>
#include <linux/iio/buffer.h>
#include "../common/hid-sensors/hid-sensor-trigger.h"
enum {
CHANNEL_SCAN_INDEX_PRESSURE,
CHANNEL_SCAN_INDEX_TIMESTAMP,
};
struct press_state {
struct hid_sensor_hub_callbacks callbacks;
struct hid_sensor_common common_attributes;
struct hid_sensor_hub_attribute_info press_attr;
struct {
u32 press_data;
u64 timestamp __aligned(8);
} scan;
int scale_pre_decml;
int scale_post_decml;
int scale_precision;
int value_offset;
s64 timestamp;
};
static const u32 press_sensitivity_addresses[] = {
HID_USAGE_SENSOR_DATA_ATMOSPHERIC_PRESSURE,
HID_USAGE_SENSOR_ATMOSPHERIC_PRESSURE
};
/* Channel definitions */
static const struct iio_chan_spec press_channels[] = {
{
.type = IIO_PRESSURE,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
BIT(IIO_CHAN_INFO_SCALE) |
BIT(IIO_CHAN_INFO_SAMP_FREQ) |
BIT(IIO_CHAN_INFO_HYSTERESIS),
.scan_index = CHANNEL_SCAN_INDEX_PRESSURE,
},
IIO_CHAN_SOFT_TIMESTAMP(CHANNEL_SCAN_INDEX_TIMESTAMP)
};
/* Adjust channel real bits based on report descriptor */
static void press_adjust_channel_bit_mask(struct iio_chan_spec *channels,
int channel, int size)
{
channels[channel].scan_type.sign = 's';
/* Real storage bits will change based on the report desc. */
channels[channel].scan_type.realbits = size * 8;
/* Maximum size of a sample to capture is u32 */
channels[channel].scan_type.storagebits = sizeof(u32) * 8;
}
/* Channel read_raw handler */
static int press_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2,
long mask)
{
struct press_state *press_state = iio_priv(indio_dev);
int report_id = -1;
u32 address;
int ret_type;
s32 min;
*val = 0;
*val2 = 0;
switch (mask) {
case IIO_CHAN_INFO_RAW:
switch (chan->scan_index) {
case CHANNEL_SCAN_INDEX_PRESSURE:
report_id = press_state->press_attr.report_id;
min = press_state->press_attr.logical_minimum;
address = HID_USAGE_SENSOR_ATMOSPHERIC_PRESSURE;
break;
default:
report_id = -1;
break;
}
if (report_id >= 0) {
hid_sensor_power_state(&press_state->common_attributes,
true);
*val = sensor_hub_input_attr_get_raw_value(
press_state->common_attributes.hsdev,
HID_USAGE_SENSOR_PRESSURE, address,
report_id,
SENSOR_HUB_SYNC,
min < 0);
hid_sensor_power_state(&press_state->common_attributes,
false);
} else {
*val = 0;
return -EINVAL;
}
ret_type = IIO_VAL_INT;
break;
case IIO_CHAN_INFO_SCALE:
*val = press_state->scale_pre_decml;
*val2 = press_state->scale_post_decml;
ret_type = press_state->scale_precision;
break;
case IIO_CHAN_INFO_OFFSET:
*val = press_state->value_offset;
ret_type = IIO_VAL_INT;
break;
case IIO_CHAN_INFO_SAMP_FREQ:
ret_type = hid_sensor_read_samp_freq_value(
&press_state->common_attributes, val, val2);
break;
case IIO_CHAN_INFO_HYSTERESIS:
ret_type = hid_sensor_read_raw_hyst_value(
&press_state->common_attributes, val, val2);
break;
default:
ret_type = -EINVAL;
break;
}
return ret_type;
}
/* Channel write_raw handler */
static int press_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int val,
int val2,
long mask)
{
struct press_state *press_state = iio_priv(indio_dev);
int ret = 0;
switch (mask) {
case IIO_CHAN_INFO_SAMP_FREQ:
ret = hid_sensor_write_samp_freq_value(
&press_state->common_attributes, val, val2);
break;
case IIO_CHAN_INFO_HYSTERESIS:
ret = hid_sensor_write_raw_hyst_value(
&press_state->common_attributes, val, val2);
break;
default:
ret = -EINVAL;
}
return ret;
}
static const struct iio_info press_info = {
.read_raw = &press_read_raw,
.write_raw = &press_write_raw,
};
/* Callback handler to send event after all samples are received and captured */
static int press_proc_event(struct hid_sensor_hub_device *hsdev,
unsigned usage_id,
void *priv)
{
struct iio_dev *indio_dev = platform_get_drvdata(priv);
struct press_state *press_state = iio_priv(indio_dev);
dev_dbg(&indio_dev->dev, "press_proc_event\n");
if (atomic_read(&press_state->common_attributes.data_ready)) {
if (!press_state->timestamp)
press_state->timestamp = iio_get_time_ns(indio_dev);
iio_push_to_buffers_with_timestamp(
indio_dev, &press_state->scan, press_state->timestamp);
}
return 0;
}
/* Capture samples in local storage */
static int press_capture_sample(struct hid_sensor_hub_device *hsdev,
unsigned usage_id,
size_t raw_len, char *raw_data,
void *priv)
{
struct iio_dev *indio_dev = platform_get_drvdata(priv);
struct press_state *press_state = iio_priv(indio_dev);
int ret = -EINVAL;
switch (usage_id) {
case HID_USAGE_SENSOR_ATMOSPHERIC_PRESSURE:
press_state->scan.press_data = *(u32 *)raw_data;
ret = 0;
break;
case HID_USAGE_SENSOR_TIME_TIMESTAMP:
press_state->timestamp = hid_sensor_convert_timestamp(
&press_state->common_attributes, *(s64 *)raw_data);
break;
default:
break;
}
return ret;
}
/* Parse report which is specific to an usage id*/
static int press_parse_report(struct platform_device *pdev,
struct hid_sensor_hub_device *hsdev,
struct iio_chan_spec *channels,
unsigned usage_id,
struct press_state *st)
{
int ret;
ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT,
usage_id,
HID_USAGE_SENSOR_ATMOSPHERIC_PRESSURE,
&st->press_attr);
if (ret < 0)
return ret;
press_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_PRESSURE,
st->press_attr.size);
dev_dbg(&pdev->dev, "press %x:%x\n", st->press_attr.index,
st->press_attr.report_id);
st->scale_precision = hid_sensor_format_scale(
HID_USAGE_SENSOR_PRESSURE,
&st->press_attr,
&st->scale_pre_decml, &st->scale_post_decml);
return ret;
}
/* Function to initialize the processing for usage id */
static int hid_press_probe(struct platform_device *pdev)
{
int ret = 0;
static const char *name = "press";
struct iio_dev *indio_dev;
struct press_state *press_state;
struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
indio_dev = devm_iio_device_alloc(&pdev->dev,
sizeof(struct press_state));
if (!indio_dev)
return -ENOMEM;
platform_set_drvdata(pdev, indio_dev);
press_state = iio_priv(indio_dev);
press_state->common_attributes.hsdev = hsdev;
press_state->common_attributes.pdev = pdev;
ret = hid_sensor_parse_common_attributes(hsdev,
HID_USAGE_SENSOR_PRESSURE,
&press_state->common_attributes,
press_sensitivity_addresses,
ARRAY_SIZE(press_sensitivity_addresses));
if (ret) {
dev_err(&pdev->dev, "failed to setup common attributes\n");
return ret;
}
indio_dev->channels = devm_kmemdup(&pdev->dev, press_channels,
sizeof(press_channels), GFP_KERNEL);
if (!indio_dev->channels) {
dev_err(&pdev->dev, "failed to duplicate channels\n");
return -ENOMEM;
}
ret = press_parse_report(pdev, hsdev,
(struct iio_chan_spec *)indio_dev->channels,
HID_USAGE_SENSOR_PRESSURE, press_state);
if (ret) {
dev_err(&pdev->dev, "failed to setup attributes\n");
return ret;
}
indio_dev->num_channels =
ARRAY_SIZE(press_channels);
indio_dev->info = &press_info;
indio_dev->name = name;
indio_dev->modes = INDIO_DIRECT_MODE;
atomic_set(&press_state->common_attributes.data_ready, 0);
ret = hid_sensor_setup_trigger(indio_dev, name,
&press_state->common_attributes);
if (ret) {
dev_err(&pdev->dev, "trigger setup failed\n");
return ret;
}
ret = iio_device_register(indio_dev);
if (ret) {
dev_err(&pdev->dev, "device register failed\n");
goto error_remove_trigger;
}
press_state->callbacks.send_event = press_proc_event;
press_state->callbacks.capture_sample = press_capture_sample;
press_state->callbacks.pdev = pdev;
ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_PRESSURE,
&press_state->callbacks);
if (ret < 0) {
dev_err(&pdev->dev, "callback reg failed\n");
goto error_iio_unreg;
}
return ret;
error_iio_unreg:
iio_device_unregister(indio_dev);
error_remove_trigger:
hid_sensor_remove_trigger(indio_dev, &press_state->common_attributes);
return ret;
}
/* Function to deinitialize the processing for usage id */
static int hid_press_remove(struct platform_device *pdev)
{
struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
struct iio_dev *indio_dev = platform_get_drvdata(pdev);
struct press_state *press_state = iio_priv(indio_dev);
sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_PRESSURE);
iio_device_unregister(indio_dev);
hid_sensor_remove_trigger(indio_dev, &press_state->common_attributes);
return 0;
}
static const struct platform_device_id hid_press_ids[] = {
{
/* Format: HID-SENSOR-usage_id_in_hex_lowercase */
.name = "HID-SENSOR-200031",
},
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(platform, hid_press_ids);
static struct platform_driver hid_press_platform_driver = {
.id_table = hid_press_ids,
.driver = {
.name = KBUILD_MODNAME,
.pm = &hid_sensor_pm_ops,
},
.probe = hid_press_probe,
.remove = hid_press_remove,
};
module_platform_driver(hid_press_platform_driver);
MODULE_DESCRIPTION("HID Sensor Pressure");
MODULE_AUTHOR("Archana Patni <archana.patni@intel.com>");
MODULE_LICENSE("GPL");
MODULE_IMPORT_NS(IIO_HID);