selftests/hid: cleanup C tests by adding a common struct uhid_device

Allows to have an abstract class uhid_device which handles all of the
uhid part without having to mess up with individual fds.

struct attach_prog_args is now never used in hid_bpf.c, so drop it as well

Acked-by: Shuah Khan <skhan@linuxfoundation.org>
Link: https://patch.msgid.link/20241001-hid-bpf-hid-generic-v3-6-2ef1019468df@kernel.org
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>

1 files changed, 50 insertions, 24 deletions

diff --git a/tools/testing/selftests/hid/hid_common.h b/tools/testing/selftests/hid/hid_common.h
index f151f151a1ed..a7d836a35bb1 100644
--- a/tools/testing/selftests/hid/hid_common.h
+++ b/tools/testing/selftests/hid/hid_common.h
@@ -19,6 +19,13 @@
 	__typeof__(b) _b = (b); \
 	_a < _b ? _a : _b; })
 
+struct uhid_device {
+	int dev_id;		/* uniq (random) number to identify the device */
+	int uhid_fd;
+	int hid_id;		/* HID device id in the system */
+	pthread_t tid;		/* thread for reading uhid events */
+};
+
 static unsigned char rdesc[] = {
 	0x06, 0x00, 0xff,	/* Usage Page (Vendor Defined Page 1) */
 	0x09, 0x21,		/* Usage (Vendor Usage 0x21) */
@@ -146,14 +153,14 @@ static int uhid_create(struct __test_metadata *_metadata, int fd, int rand_nb)
 	return uhid_write(_metadata, fd, &ev);
 }
 
-static void uhid_destroy(struct __test_metadata *_metadata, int fd)
+static void uhid_destroy(struct __test_metadata *_metadata, struct uhid_device *hid)
 {
 	struct uhid_event ev;
 
 	memset(&ev, 0, sizeof(ev));
 	ev.type = UHID_DESTROY;
 
-	uhid_write(_metadata, fd, &ev);
+	uhid_write(_metadata, hid->uhid_fd, &ev);
 }
 
 static int uhid_event(struct __test_metadata *_metadata, int fd)
@@ -281,7 +288,8 @@ static int uhid_start_listener(struct __test_metadata *_metadata, pthread_t *tid
 	return 0;
 }
 
-static int uhid_send_event(struct __test_metadata *_metadata, int fd, __u8 *buf, size_t size)
+static int uhid_send_event(struct __test_metadata *_metadata, struct uhid_device *hid,
+			   __u8 *buf, size_t size)
 {
 	struct uhid_event ev;
 
@@ -294,25 +302,7 @@ static int uhid_send_event(struct __test_metadata *_metadata, int fd, __u8 *buf,
 
 	memcpy(ev.u.input2.data, buf, size);
 
-	return uhid_write(_metadata, fd, &ev);
-}
-
-static int setup_uhid(struct __test_metadata *_metadata, int rand_nb)
-{
-	int fd;
-	const char *path = "/dev/uhid";
-	int ret;
-
-	fd = open(path, O_RDWR | O_CLOEXEC);
-	ASSERT_GE(fd, 0) TH_LOG("open uhid-cdev failed; %d", fd);
-
-	ret = uhid_create(_metadata, fd, rand_nb);
-	ASSERT_EQ(0, ret) {
-		TH_LOG("create uhid device failed: %d", ret);
-		close(fd);
-	}
-
-	return fd;
+	return uhid_write(_metadata, hid->uhid_fd, &ev);
 }
 
 static bool match_sysfs_device(int dev_id, const char *workdir, struct dirent *dir)
@@ -421,12 +411,12 @@ static int get_hidraw(int dev_id)
 	return found;
 }
 
-static int open_hidraw(int dev_id)
+static int open_hidraw(struct uhid_device *hid)
 {
 	int hidraw_number;
 	char hidraw_path[64] = { 0 };
 
-	hidraw_number = get_hidraw(dev_id);
+	hidraw_number = get_hidraw(hid->dev_id);
 	if (hidraw_number < 0)
 		return hidraw_number;
 
@@ -434,3 +424,39 @@ static int open_hidraw(int dev_id)
 	sprintf(hidraw_path, "/dev/hidraw%d", hidraw_number);
 	return open(hidraw_path, O_RDWR | O_NONBLOCK);
 }
+
+static int setup_uhid(struct __test_metadata *_metadata, struct uhid_device *hid)
+{
+	const char *path = "/dev/uhid";
+	time_t t;
+	int ret;
+
+	/* initialize random number generator */
+	srand((unsigned int)time(&t));
+
+	hid->dev_id = rand() % 1024;
+
+	hid->uhid_fd = open(path, O_RDWR | O_CLOEXEC);
+	ASSERT_GE(hid->uhid_fd, 0) TH_LOG("open uhid-cdev failed; %d", hid->uhid_fd);
+
+	ret = uhid_create(_metadata, hid->uhid_fd, hid->dev_id);
+	ASSERT_EQ(0, ret) {
+		TH_LOG("create uhid device failed: %d", ret);
+		close(hid->uhid_fd);
+		return ret;
+	}
+
+	/* locate the uevent file of the created device */
+	hid->hid_id = get_hid_id(hid->dev_id);
+	ASSERT_GT(hid->hid_id, 0)
+		TH_LOG("Could not locate uhid device id: %d", hid->hid_id);
+
+	ret = uhid_start_listener(_metadata, &hid->tid, hid->uhid_fd);
+	ASSERT_EQ(0, ret) {
+		TH_LOG("could not start udev listener: %d", ret);
+		close(hid->uhid_fd);
+		return ret;
+	}
+
+	return 0;
+}