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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* Common/core components for the Surface System Aggregator Module (SSAM) HID
* transport driver. Provides support for integrated HID devices on Microsoft
* Surface models.
*
* Copyright (C) 2019-2021 Maximilian Luz <luzmaximilian@gmail.com>
*/
#ifndef SURFACE_HID_CORE_H
#define SURFACE_HID_CORE_H
#include <linux/hid.h>
#include <linux/pm.h>
#include <linux/types.h>
#include <linux/surface_aggregator/controller.h>
#include <linux/surface_aggregator/device.h>
enum surface_hid_descriptor_entry {
SURFACE_HID_DESC_HID = 0,
SURFACE_HID_DESC_REPORT = 1,
SURFACE_HID_DESC_ATTRS = 2,
};
struct surface_hid_descriptor {
__u8 desc_len; /* = 9 */
__u8 desc_type; /* = HID_DT_HID */
__le16 hid_version;
__u8 country_code;
__u8 num_descriptors; /* = 1 */
__u8 report_desc_type; /* = HID_DT_REPORT */
__le16 report_desc_len;
} __packed;
static_assert(sizeof(struct surface_hid_descriptor) == 9);
struct surface_hid_attributes {
__le32 length;
__le16 vendor;
__le16 product;
__le16 version;
__u8 _unknown[22];
} __packed;
static_assert(sizeof(struct surface_hid_attributes) == 32);
struct surface_hid_device;
struct surface_hid_device_ops {
int (*get_descriptor)(struct surface_hid_device *shid, u8 entry, u8 *buf, size_t len);
int (*output_report)(struct surface_hid_device *shid, u8 rprt_id, u8 *buf, size_t len);
int (*get_feature_report)(struct surface_hid_device *shid, u8 rprt_id, u8 *buf, size_t len);
int (*set_feature_report)(struct surface_hid_device *shid, u8 rprt_id, u8 *buf, size_t len);
};
struct surface_hid_device {
struct device *dev;
struct ssam_controller *ctrl;
struct ssam_device_uid uid;
struct surface_hid_descriptor hid_desc;
struct surface_hid_attributes attrs;
struct ssam_event_notifier notif;
struct hid_device *hid;
struct surface_hid_device_ops ops;
};
int surface_hid_device_add(struct surface_hid_device *shid);
void surface_hid_device_destroy(struct surface_hid_device *shid);
extern const struct dev_pm_ops surface_hid_pm_ops;
#endif /* SURFACE_HID_CORE_H */
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