diff options
Diffstat (limited to 'drivers/hid/surface-hid/surface_hid_core.h')
-rw-r--r-- | drivers/hid/surface-hid/surface_hid_core.h | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/drivers/hid/surface-hid/surface_hid_core.h b/drivers/hid/surface-hid/surface_hid_core.h new file mode 100644 index 000000000..4b1a7b57e --- /dev/null +++ b/drivers/hid/surface-hid/surface_hid_core.h @@ -0,0 +1,77 @@ +/* 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 */ |