selftests/hid: allow to parametrize bus/vid/pid/rdesc on the test device

This will be useful to introduce variants in tests to test the
interactions between HID-BPF and some kernel modules.

Reviewed-by: Peter Hutterer <[e-mail]>
Acked-by: Shuah Khan <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Benjamin Tissoires <[e-mail]>

tools/testing/selftests/hid/hid_bpf.c

···
 {
 	int err;
 
-	err = setup_uhid(_metadata, &self->hid);
+	err = setup_uhid(_metadata, &self->hid, BUS_USB, 0x0001, 0x0a36, rdesc, sizeof(rdesc));
 	ASSERT_OK(err);
 }
 

tools/testing/selftests/hid/hid_common.h

···
 	int dev_id;		/* uniq (random) number to identify the device */
 	int uhid_fd;
 	int hid_id;		/* HID device id in the system */
+	__u16 bus;
+	__u32 vid;
+	__u32 pid;
 	pthread_t tid;		/* thread for reading uhid events */
 };
 
···
 	}
 }
 
-static int uhid_create(struct __test_metadata *_metadata, int fd, int rand_nb)
+static int uhid_create(struct __test_metadata *_metadata, int fd, int rand_nb,
+		       __u16 bus, __u32 vid, __u32 pid, __u8 *rdesc,
+		       size_t rdesc_size)
 {
 	struct uhid_event ev;
 	char buf[25];
···
 	ev.type = UHID_CREATE;
 	strcpy((char *)ev.u.create.name, buf);
 	ev.u.create.rd_data = rdesc;
-	ev.u.create.rd_size = sizeof(rdesc);
-	ev.u.create.bus = BUS_USB;
-	ev.u.create.vendor = 0x0001;
-	ev.u.create.product = 0x0a37;
+	ev.u.create.rd_size = rdesc_size;
+	ev.u.create.bus = bus;
+	ev.u.create.vendor = vid;
+	ev.u.create.product = pid;
 	ev.u.create.version = 0;
 	ev.u.create.country = 0;
 
···
 	return uhid_write(_metadata, hid->uhid_fd, &ev);
 }
 
-static bool match_sysfs_device(int dev_id, const char *workdir, struct dirent *dir)
+static bool match_sysfs_device(struct uhid_device *hid, const char *workdir, struct dirent *dir)
 {
-	const char *target = "0003:0001:0A37.*";
+	char target[20] = "";
 	char phys[512];
 	char uevent[1024];
 	char temp[512];
 	int fd, nread;
 	bool found = false;
+
+	snprintf(target, sizeof(target), "%04X:%04X:%04X.*", hid->bus, hid->vid, hid->pid);
 
 	if (fnmatch(target, dir->d_name, 0))
 		return false;
···
 	if (fd < 0)
 		return false;
 
-	sprintf(phys, "PHYS=%d", dev_id);
+	sprintf(phys, "PHYS=%d", hid->dev_id);
 
 	nread = read(fd, temp, ARRAY_SIZE(temp));
 	if (nread > 0 && (strstr(temp, phys)) != NULL)
···
 	return found;
 }
 
-static int get_hid_id(int dev_id)
+static int get_hid_id(struct uhid_device *hid)
 {
 	const char *workdir = "/sys/devices/virtual/misc/uhid";
 	const char *str_id;
···
 		d = opendir(workdir);
 		if (d) {
 			while ((dir = readdir(d)) != NULL) {
-				if (!match_sysfs_device(dev_id, workdir, dir))
+				if (!match_sysfs_device(hid, workdir, dir))
 					continue;
 
-				str_id = dir->d_name + sizeof("0003:0001:0A37.");
+				str_id = dir->d_name + sizeof("0000:0000:0000.");
 				found = (int)strtol(str_id, NULL, 16);
 
 				break;
···
 	return found;
 }
 
-static int get_hidraw(int dev_id)
+static int get_hidraw(struct uhid_device *hid)
 {
 	const char *workdir = "/sys/devices/virtual/misc/uhid";
 	char sysfs[1024];
···
 			continue;
 
 		while ((dir = readdir(d)) != NULL) {
-			if (!match_sysfs_device(dev_id, workdir, dir))
+			if (!match_sysfs_device(hid, workdir, dir))
 				continue;
 
 			sprintf(sysfs, "%s/%s/hidraw", workdir, dir->d_name);
···
 	int hidraw_number;
 	char hidraw_path[64] = { 0 };
 
-	hidraw_number = get_hidraw(hid->dev_id);
+	hidraw_number = get_hidraw(hid);
 	if (hidraw_number < 0)
 		return hidraw_number;
 
···
 	return open(hidraw_path, O_RDWR | O_NONBLOCK);
 }
 
-static int setup_uhid(struct __test_metadata *_metadata, struct uhid_device *hid)
+static int setup_uhid(struct __test_metadata *_metadata, struct uhid_device *hid,
+		      __u16 bus, __u32 vid, __u32 pid, const __u8 *rdesc, size_t rdesc_size)
 {
 	const char *path = "/dev/uhid";
 	time_t t;
···
 	srand((unsigned int)time(&t));
 
 	hid->dev_id = rand() % 1024;
+	hid->bus = bus;
+	hid->vid = vid;
+	hid->pid = pid;
 
 	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);
+	ret = uhid_create(_metadata, hid->uhid_fd, hid->dev_id, bus, vid, pid,
+			  (__u8 *)rdesc, rdesc_size);
 	ASSERT_EQ(0, ret) {
 		TH_LOG("create uhid device failed: %d", ret);
 		close(hid->uhid_fd);
···
 	}
 
 	/* locate the uevent file of the created device */
-	hid->hid_id = get_hid_id(hid->dev_id);
+	hid->hid_id = get_hid_id(hid);
 	ASSERT_GT(hid->hid_id, 0)
 		TH_LOG("Could not locate uhid device id: %d", hid->hid_id);
 

tools/testing/selftests/hid/hidraw.c

···
 {
 	int err;
 
-	err = setup_uhid(_metadata, &self->hid);
+	err = setup_uhid(_metadata, &self->hid, BUS_USB, 0x0001, 0x0a37, rdesc, sizeof(rdesc));
 	ASSERT_OK(err);
 
 	self->hidraw_fd = open_hidraw(&self->hid);