path: root/drivers/hid/hid-sensor-custom.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * hid-sensor-custom.c
 * Copyright (c) 2015, Intel Corporation.
 */

#include <linux/ctype.h>
#include <linux/dmi.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/miscdevice.h>
#include <linux/kfifo.h>
#include <linux/sched.h>
#include <linux/wait.h>
#include <linux/poll.h>
#include <linux/bsearch.h>
#include <linux/platform_device.h>
#include <linux/hid-sensor-hub.h>

#define HID_CUSTOM_NAME_LENGTH		64
#define HID_CUSTOM_MAX_CORE_ATTRS	10
#define HID_CUSTOM_TOTAL_ATTRS		(HID_CUSTOM_MAX_CORE_ATTRS + 1)
#define HID_CUSTOM_FIFO_SIZE		4096
#define HID_CUSTOM_MAX_FEATURE_BYTES	64
#define HID_SENSOR_USAGE_LENGTH (4 + 1)

struct hid_sensor_custom_field {
	int report_id;
	char group_name[HID_CUSTOM_NAME_LENGTH];
	struct hid_sensor_hub_attribute_info attribute;
	struct device_attribute sd_attrs[HID_CUSTOM_MAX_CORE_ATTRS];
	char attr_name[HID_CUSTOM_TOTAL_ATTRS][HID_CUSTOM_NAME_LENGTH];
	struct attribute *attrs[HID_CUSTOM_TOTAL_ATTRS];
	struct attribute_group hid_custom_attribute_group;
};

struct hid_sensor_custom {
	struct mutex mutex;
	struct platform_device *pdev;
	struct hid_sensor_hub_device *hsdev;
	struct hid_sensor_hub_callbacks callbacks;
	int sensor_field_count;
	struct hid_sensor_custom_field *fields;
	int input_field_count;
	int input_report_size;
	int input_report_recd_size;
	bool input_skip_sample;
	bool enable;
	struct hid_sensor_custom_field *power_state;
	struct hid_sensor_custom_field *report_state;
	struct miscdevice custom_dev;
	struct kfifo data_fifo;
	unsigned long misc_opened;
	wait_queue_head_t wait;
	struct platform_device *custom_pdev;
};

/* Header for each sample to user space via dev interface */
struct hid_sensor_sample {
	u32 usage_id;
	u64 timestamp;
	u32 raw_len;
} __packed;

static struct attribute hid_custom_attrs[HID_CUSTOM_TOTAL_ATTRS] = {
	{.name = "name", .mode = S_IRUGO},
	{.name = "units", .mode = S_IRUGO},
	{.name = "unit-expo", .mode = S_IRUGO},
	{.name = "minimum", .mode = S_IRUGO},
	{.name = "maximum", .mode = S_IRUGO},
	{.name = "size", .mode = S_IRUGO},
	{.name = "value", .mode = S_IWUSR | S_IRUGO},
	{.name = NULL}
};

static const struct hid_custom_usage_desc {
	int usage_id;
	char *desc;
} hid_custom_usage_desc_table[] = {
	{0x200201,	"event-sensor-state"},
	{0x200202,	"event-sensor-event"},
	{0x200301,	"property-friendly-name"},
	{0x200302,	"property-persistent-unique-id"},
	{0x200303,	"property-sensor-status"},
	{0x200304,	"property-min-report-interval"},
	{0x200305,	"property-sensor-manufacturer"},
	{0x200306,	"property-sensor-model"},
	{0x200307,	"property-sensor-serial-number"},
	{0x200308,	"property-sensor-description"},
	{0x200309,	"property-sensor-connection-type"},
	{0x20030A,	"property-sensor-device-path"},
	{0x20030B,	"property-hardware-revision"},
	{0x20030C,	"property-firmware-version"},
	{0x20030D,	"property-release-date"},
	{0x20030E,	"property-report-interval"},
	{0x20030F,	"property-change-sensitivity-absolute"},
	{0x200310,	"property-change-sensitivity-percent-range"},
	{0x200311,	"property-change-sensitivity-percent-relative"},
	{0x200312,	"property-accuracy"},
	{0x200313,	"property-resolution"},
	{0x200314,	"property-maximum"},
	{0x200315,	"property-minimum"},
	{0x200316,	"property-reporting-state"},
	{0x200317,	"property-sampling-rate"},
	{0x200318,	"property-response-curve"},
	{0x200319,	"property-power-state"},
	{0x200540,	"data-field-custom"},
	{0x200541,	"data-field-custom-usage"},
	{0x200542,	"data-field-custom-boolean-array"},
	{0x200543,	"data-field-custom-value"},
	{0x200544,	"data-field-custom-value_1"},
	{0x200545,	"data-field-custom-value_2"},
	{0x200546,	"data-field-custom-value_3"},