KFunc hid_bpf_hw_request

v6.3

Communicate with a HID device

Definition

Parameters

ctx: the HID-BPF context previously allocated in hid_bpf_allocate_context

buf: a PTR_TO_MEM buffer

buf__sz: the size of the data to transfer

rtype: the type of the report (HID_INPUT_REPORT, HID_FEATURE_REPORT, HID_OUTPUT_REPORT)

reqtype: the type of the request (HID_REQ_GET_REPORT, HID_REQ_SET_REPORT, ...)

Returns

0 on success, a negative error code otherwise.

int hid_bpf_hw_request(struct hid_bpf_ctx *ctx, __u8 *buf, size_t buf__sz, hid_report_type rtype, hid_class_request reqtype)

Note

This function may sleep, and therefore can only be used from sleepable programs. This is only true when not used from BPF_PROG_TYPE_SYSCALL programs.

Usage

Docs could be improved

This part of the docs is incomplete, contributions are very welcome

Program types

The following program types can make use of this kfunc:

• BPF_PROG_TYPE_LSM Until v6.11
• BPF_PROG_TYPE_TRACING Until v6.11
• BPF_PROG_TYPE_STRUCT_OPS Since v6.11
• BPF_PROG_TYPE_SYSCALL

Example

See hid_bpf_allocate_context for an example of how to use this kfunc.