On 3/15/24 07:44, Benjamin Tissoires wrote:
It can be interesting to inject events from BPF as if the event were to come from the device. For example, some multitouch devices do not all the time send a proximity out event, and we might want to send it for the physical device.
Compared to uhid, we can now inject events on any physical device, not just uhid virtual ones.
Signed-off-by: Benjamin Tissoires bentiss@kernel.org
no changes in v4
no changes in v3
no changes in v2
Documentation/hid/hid-bpf.rst | 2 +- drivers/hid/bpf/hid_bpf_dispatch.c | 29 +++++++++++++++++++++++++++++ drivers/hid/hid-core.c | 1 + include/linux/hid_bpf.h | 2 ++ 4 files changed, 33 insertions(+), 1 deletion(-)
diff --git a/Documentation/hid/hid-bpf.rst b/Documentation/hid/hid-bpf.rst index a575004d9025..0765b3298ecf 100644 --- a/Documentation/hid/hid-bpf.rst +++ b/Documentation/hid/hid-bpf.rst @@ -179,7 +179,7 @@ Available API that can be used in syscall HID-BPF programs:
.. kernel-doc:: drivers/hid/bpf/hid_bpf_dispatch.c
- :functions: hid_bpf_attach_prog hid_bpf_hw_request hid_bpf_hw_output_report hid_bpf_allocate_context hid_bpf_release_context
- :functions: hid_bpf_attach_prog hid_bpf_hw_request hid_bpf_hw_output_report hid_bpf_input_report hid_bpf_allocate_context hid_bpf_release_context
General overview of a HID-BPF program ===================================== diff --git a/drivers/hid/bpf/hid_bpf_dispatch.c b/drivers/hid/bpf/hid_bpf_dispatch.c index a5b88b491b80..e1a650f4a626 100644 --- a/drivers/hid/bpf/hid_bpf_dispatch.c +++ b/drivers/hid/bpf/hid_bpf_dispatch.c @@ -508,6 +508,34 @@ hid_bpf_hw_output_report(struct hid_bpf_ctx *ctx, __u8 *buf, size_t buf__sz) kfree(dma_data); return ret; }
+/**
- hid_bpf_input_report - Inject a HID report in the kernel from a HID device
- @ctx: the HID-BPF context previously allocated in hid_bpf_allocate_context()
- @type: the type of the report (%HID_INPUT_REPORT, %HID_FEATURE_REPORT, %HID_OUTPUT_REPORT)
- @buf: a %PTR_TO_MEM buffer
- @buf__sz: the size of the data to transfer
- @returns %0 on success, a negative error code otherwise.
Minimum change:
@returns:
Preferred change:
Returns:
"@returns" is not documented.
- */
+__bpf_kfunc int +hid_bpf_input_report(struct hid_bpf_ctx *ctx, enum hid_report_type type, u8 *buf,
const size_t buf__sz)+{