Commit 0330f725 authored by Benjamin Tissoires's avatar Benjamin Tissoires Committed by Jiri Kosina
Browse files

selftests/hid: add test to change the report size 



Use a different report with a bigger size and ensures we are doing
things properly.

Signed-off-by: default avatarBenjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
parent 658ee5a6

tools/testing/selftests/hid/hid_bpf.c

+41 −0
Original line number Diff line number Diff line
@@ -22,6 +22,17 @@ static unsigned char rdesc[] = { 
	0xa1, 0x01,		/* COLLECTION (Application) */

	0x09, 0x01,			/* Usage (Vendor Usage 0x01) */

	0xa1, 0x00,			/* COLLECTION (Physical) */

	0x85, 0x02,				/* REPORT_ID (2) */

	0x19, 0x01,				/* USAGE_MINIMUM (1) */

	0x29, 0x08,				/* USAGE_MAXIMUM (3) */

	0x15, 0x00,				/* LOGICAL_MINIMUM (0) */

	0x25, 0xff,				/* LOGICAL_MAXIMUM (255) */

	0x95, 0x08,				/* REPORT_COUNT (8) */

	0x75, 0x08,				/* REPORT_SIZE (8) */

	0x81, 0x02,				/* INPUT (Data,Var,Abs) */

	0xc0,				/* END_COLLECTION */

	0x09, 0x01,			/* Usage (Vendor Usage 0x01) */

	0xa1, 0x00,			/* COLLECTION (Physical) */

	0x85, 0x01,				/* REPORT_ID (1) */

	0x06, 0x00, 0xff,			/* Usage Page (Vendor Defined Page 1) */

	0x19, 0x01,				/* USAGE_MINIMUM (1) */
@@ -645,6 +656,36 @@ TEST_F(hid_bpf, test_attach_detach) 
	ASSERT_EQ(buf[2], 47);

}



/*

 * Attach hid_change_report_id to the given uhid device,

 * retrieve and open the matching hidraw node,

 * inject one event in the uhid device,

 * check that the program sees it and can change the data

 */

TEST_F(hid_bpf, test_hid_change_report)

{

	const struct test_program progs[] = {

		{ .name = "hid_change_report_id" },

	};

	__u8 buf[10] = {0};

	int err;



	LOAD_PROGRAMS(progs);



	/* inject one event */

	buf[0] = 1;

	buf[1] = 42;

	uhid_send_event(_metadata, self->uhid_fd, buf, 6);



	/* read the data from hidraw */

	memset(buf, 0, sizeof(buf));

	err = read(self->hidraw_fd, buf, sizeof(buf));

	ASSERT_EQ(err, 9) TH_LOG("read_hidraw");

	ASSERT_EQ(buf[0], 2);

	ASSERT_EQ(buf[1], 42);

	ASSERT_EQ(buf[2], 0) TH_LOG("leftovers_from_previous_test");

}



static int libbpf_print_fn(enum libbpf_print_level level,

			   const char *format, va_list args)

{

tools/testing/selftests/hid/progs/hid.c

+14 −1
Original line number Diff line number Diff line
@@ -28,7 +28,20 @@ int BPF_PROG(hid_first_event, struct hid_bpf_ctx *hid_ctx) 


	rw_data[2] = rw_data[1] + 5;



	return 0;

	return hid_ctx->size;

}



SEC("?fmod_ret/hid_bpf_device_event")

int BPF_PROG(hid_change_report_id, struct hid_bpf_ctx *hid_ctx)

{

	__u8 *rw_data = hid_bpf_get_data(hid_ctx, 0 /* offset */, 3 /* size */);



	if (!rw_data)

		return 0; /* EPERM check */



	rw_data[0] = 2;



	return 9;

}



SEC("syscall")