Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-only
/*
 * HID Sensors Driver
 * Copyright (c) 2012, Intel Corporation.
 */
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/hid-sensor-hub.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/buffer.h>
#include "../common/hid-sensors/hid-sensor-trigger.h"
 
enum {
<------>CHANNEL_SCAN_INDEX_INTENSITY = 0,
<------>CHANNEL_SCAN_INDEX_ILLUM = 1,
<------>CHANNEL_SCAN_INDEX_MAX
};
 
struct als_state {
<------>struct hid_sensor_hub_callbacks callbacks;
<------>struct hid_sensor_common common_attributes;
<------>struct hid_sensor_hub_attribute_info als_illum;
<------>u32 illum[CHANNEL_SCAN_INDEX_MAX];
<------>int scale_pre_decml;
<------>int scale_post_decml;
<------>int scale_precision;
<------>int value_offset;
};
 
/* Channel definitions */
static const struct iio_chan_spec als_channels[] = {
<------>{
<------><------>.type = IIO_INTENSITY,
<------><------>.modified = 1,
<------><------>.channel2 = IIO_MOD_LIGHT_BOTH,
<------><------>.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_INTENSITY,
<------>},
<------>{
<------><------>.type = IIO_LIGHT,
<------><------>.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_ILLUM,
<------>}
};
 
/* Adjust channel real bits based on report descriptor */
static void als_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 als_read_raw(struct iio_dev *indio_dev,
<------><------><------>      struct iio_chan_spec const *chan,
<------><------><------>      int *val, int *val2,
<------><------><------>      long mask)
{
<------>struct als_state *als_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_INTENSITY:
<------><------>case  CHANNEL_SCAN_INDEX_ILLUM:
<------><------><------>report_id = als_state->als_illum.report_id;
<------><------><------>min = als_state->als_illum.logical_minimum;
<------><------><------>address = HID_USAGE_SENSOR_LIGHT_ILLUM;
<------><------><------>break;
<------><------>default:
<------><------><------>report_id = -1;
<------><------><------>break;
<------><------>}
<------><------>if (report_id >= 0) {
<------><------><------>hid_sensor_power_state(&als_state->common_attributes,
<------><------><------><------><------><------>true);
<------><------><------>*val = sensor_hub_input_attr_get_raw_value(
<------><------><------><------><------>als_state->common_attributes.hsdev,
<------><------><------><------><------>HID_USAGE_SENSOR_ALS, address,
<------><------><------><------><------>report_id,
<------><------><------><------><------>SENSOR_HUB_SYNC,
<------><------><------><------><------>min < 0);
<------><------><------>hid_sensor_power_state(&als_state->common_attributes,
<------><------><------><------><------><------>false);
<------><------>} else {
<------><------><------>*val = 0;
<------><------><------>return -EINVAL;
<------><------>}
<------><------>ret_type = IIO_VAL_INT;
<------><------>break;
<------>case IIO_CHAN_INFO_SCALE:
<------><------>*val = als_state->scale_pre_decml;
<------><------>*val2 = als_state->scale_post_decml;
<------><------>ret_type = als_state->scale_precision;
<------><------>break;
<------>case IIO_CHAN_INFO_OFFSET:
<------><------>*val = als_state->value_offset;
<------><------>ret_type = IIO_VAL_INT;
<------><------>break;
<------>case IIO_CHAN_INFO_SAMP_FREQ:
<------><------>ret_type = hid_sensor_read_samp_freq_value(
<------><------><------><------>&als_state->common_attributes, val, val2);
<------><------>break;
<------>case IIO_CHAN_INFO_HYSTERESIS:
<------><------>ret_type = hid_sensor_read_raw_hyst_value(
<------><------><------><------>&als_state->common_attributes, val, val2);
<------><------>break;
<------>default:
<------><------>ret_type = -EINVAL;
<------><------>break;
<------>}
 
<------>return ret_type;
}
 
/* Channel write_raw handler */
static int als_write_raw(struct iio_dev *indio_dev,
<------><------><------>       struct iio_chan_spec const *chan,
<------><------><------>       int val,
<------><------><------>       int val2,
<------><------><------>       long mask)
{
<------>struct als_state *als_state = iio_priv(indio_dev);
<------>int ret = 0;
 
<------>switch (mask) {
<------>case IIO_CHAN_INFO_SAMP_FREQ:
<------><------>ret = hid_sensor_write_samp_freq_value(
<------><------><------><------>&als_state->common_attributes, val, val2);
<------><------>break;
<------>case IIO_CHAN_INFO_HYSTERESIS:
<------><------>ret = hid_sensor_write_raw_hyst_value(
<------><------><------><------>&als_state->common_attributes, val, val2);
<------><------>break;
<------>default:
<------><------>ret = -EINVAL;
<------>}
 
<------>return ret;
}
 
static const struct iio_info als_info = {
<------>.read_raw = &als_read_raw,
<------>.write_raw = &als_write_raw,
};
 
/* Function to push data to buffer */
static void hid_sensor_push_data(struct iio_dev *indio_dev, const void *data,
<------><------><------><------><------>int len)
{
<------>dev_dbg(&indio_dev->dev, "hid_sensor_push_data\n");
<------>iio_push_to_buffers(indio_dev, data);
}
 
/* Callback handler to send event after all samples are received and captured */
static int als_proc_event(struct hid_sensor_hub_device *hsdev,
<------><------><------><------>unsigned usage_id,
<------><------><------><------>void *priv)
{
<------>struct iio_dev *indio_dev = platform_get_drvdata(priv);
<------>struct als_state *als_state = iio_priv(indio_dev);
 
<------>dev_dbg(&indio_dev->dev, "als_proc_event\n");
<------>if (atomic_read(&als_state->common_attributes.data_ready))
<------><------>hid_sensor_push_data(indio_dev,
<------><------><------><------>&als_state->illum,
<------><------><------><------>sizeof(als_state->illum));
 
<------>return 0;
}
 
/* Capture samples in local storage */
static int als_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 als_state *als_state = iio_priv(indio_dev);
<------>int ret = -EINVAL;
<------>u32 sample_data = *(u32 *)raw_data;
 
<------>switch (usage_id) {
<------>case HID_USAGE_SENSOR_LIGHT_ILLUM:
<------><------>als_state->illum[CHANNEL_SCAN_INDEX_INTENSITY] = sample_data;
<------><------>als_state->illum[CHANNEL_SCAN_INDEX_ILLUM] = sample_data;
<------><------>ret = 0;
<------><------>break;
<------>default:
<------><------>break;
<------>}
 
<------>return ret;
}
 
/* Parse report which is specific to an usage id*/
static int als_parse_report(struct platform_device *pdev,
<------><------><------><------>struct hid_sensor_hub_device *hsdev,
<------><------><------><------>struct iio_chan_spec *channels,
<------><------><------><------>unsigned usage_id,
<------><------><------><------>struct als_state *st)
{
<------>int ret;
 
<------>ret = sensor_hub_input_get_attribute_info(hsdev, HID_INPUT_REPORT,
<------><------><------>usage_id,
<------><------><------>HID_USAGE_SENSOR_LIGHT_ILLUM,
<------><------><------>&st->als_illum);
<------>if (ret < 0)
<------><------>return ret;
<------>als_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_INTENSITY,
<------><------><------><------>    st->als_illum.size);
<------>als_adjust_channel_bit_mask(channels, CHANNEL_SCAN_INDEX_ILLUM,
<------><------><------><------><------>st->als_illum.size);
 
<------>dev_dbg(&pdev->dev, "als %x:%x\n", st->als_illum.index,
<------><------><------>st->als_illum.report_id);
 
<------>st->scale_precision = hid_sensor_format_scale(
<------><------><------><------>HID_USAGE_SENSOR_ALS,
<------><------><------><------>&st->als_illum,
<------><------><------><------>&st->scale_pre_decml, &st->scale_post_decml);
 
<------>/* Set Sensitivity field ids, when there is no individual modifier */
<------>if (st->common_attributes.sensitivity.index < 0) {
<------><------>sensor_hub_input_get_attribute_info(hsdev,
<------><------><------>HID_FEATURE_REPORT, usage_id,
<------><------><------>HID_USAGE_SENSOR_DATA_MOD_CHANGE_SENSITIVITY_ABS |
<------><------><------>HID_USAGE_SENSOR_DATA_LIGHT,
<------><------><------>&st->common_attributes.sensitivity);
<------><------>dev_dbg(&pdev->dev, "Sensitivity index:report %d:%d\n",
<------><------><------>st->common_attributes.sensitivity.index,
<------><------><------>st->common_attributes.sensitivity.report_id);
<------>}
<------>return ret;
}
 
/* Function to initialize the processing for usage id */
static int hid_als_probe(struct platform_device *pdev)
{
<------>int ret = 0;
<------>static const char *name = "als";
<------>struct iio_dev *indio_dev;
<------>struct als_state *als_state;
<------>struct hid_sensor_hub_device *hsdev = pdev->dev.platform_data;
 
<------>indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(struct als_state));
<------>if (!indio_dev)
<------><------>return -ENOMEM;
<------>platform_set_drvdata(pdev, indio_dev);
 
<------>als_state = iio_priv(indio_dev);
<------>als_state->common_attributes.hsdev = hsdev;
<------>als_state->common_attributes.pdev = pdev;
 
<------>ret = hid_sensor_parse_common_attributes(hsdev, HID_USAGE_SENSOR_ALS,
<------><------><------><------><------>&als_state->common_attributes);
<------>if (ret) {
<------><------>dev_err(&pdev->dev, "failed to setup common attributes\n");
<------><------>return ret;
<------>}
 
<------>indio_dev->channels = kmemdup(als_channels,
<------><------><------><------>      sizeof(als_channels), GFP_KERNEL);
<------>if (!indio_dev->channels) {
<------><------>dev_err(&pdev->dev, "failed to duplicate channels\n");
<------><------>return -ENOMEM;
<------>}
 
<------>ret = als_parse_report(pdev, hsdev,
<------><------><------>       (struct iio_chan_spec *)indio_dev->channels,
<------><------><------>       HID_USAGE_SENSOR_ALS, als_state);
<------>if (ret) {
<------><------>dev_err(&pdev->dev, "failed to setup attributes\n");
<------><------>goto error_free_dev_mem;
<------>}
 
<------>indio_dev->num_channels =
<------><------><------><------>ARRAY_SIZE(als_channels);
<------>indio_dev->info = &als_info;
<------>indio_dev->name = name;
<------>indio_dev->modes = INDIO_DIRECT_MODE;
 
<------>atomic_set(&als_state->common_attributes.data_ready, 0);
 
<------>ret = hid_sensor_setup_trigger(indio_dev, name,
<------><------><------><------>&als_state->common_attributes);
<------>if (ret < 0) {
<------><------>dev_err(&pdev->dev, "trigger setup failed\n");
<------><------>goto error_free_dev_mem;
<------>}
 
<------>ret = iio_device_register(indio_dev);
<------>if (ret) {
<------><------>dev_err(&pdev->dev, "device register failed\n");
<------><------>goto error_remove_trigger;
<------>}
 
<------>als_state->callbacks.send_event = als_proc_event;
<------>als_state->callbacks.capture_sample = als_capture_sample;
<------>als_state->callbacks.pdev = pdev;
<------>ret = sensor_hub_register_callback(hsdev, HID_USAGE_SENSOR_ALS,
<------><------><------><------><------>&als_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, &als_state->common_attributes);
error_free_dev_mem:
<------>kfree(indio_dev->channels);
<------>return ret;
}
 
/* Function to deinitialize the processing for usage id */
static int hid_als_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 als_state *als_state = iio_priv(indio_dev);
 
<------>sensor_hub_remove_callback(hsdev, HID_USAGE_SENSOR_ALS);
<------>iio_device_unregister(indio_dev);
<------>hid_sensor_remove_trigger(indio_dev, &als_state->common_attributes);
<------>kfree(indio_dev->channels);
 
<------>return 0;
}
 
static const struct platform_device_id hid_als_ids[] = {
<------>{
<------><------>/* Format: HID-SENSOR-usage_id_in_hex_lowercase */
<------><------>.name = "HID-SENSOR-200041",
<------>},
<------>{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(platform, hid_als_ids);
 
static struct platform_driver hid_als_platform_driver = {
<------>.id_table = hid_als_ids,
<------>.driver = {
<------><------>.name	= KBUILD_MODNAME,
<------><------>.pm	= &hid_sensor_pm_ops,
<------>},
<------>.probe		= hid_als_probe,
<------>.remove		= hid_als_remove,
};
module_platform_driver(hid_als_platform_driver);
 
MODULE_DESCRIPTION("HID Sensor ALS");
MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
MODULE_LICENSE("GPL");