testevdev: Verify most Wii devices against real hardware

Some of the test data previously seen here was guessed from kernel
source code, and not all of it was correct. The following devices have
now been verified against `evemu-describe` output with Linux 6.3
(thanks to Jeremy Whiting for collecting this):

- basic Wiimote
    - buttons
    - 3-axis accelerometer
    - infra-red sensor for Sensor Bar location (precise aim)
- Motion Plus accessory (3-axis gyroscope)
- Nunchuck accessory (joystick, 2 buttons, second 3-axis accelerometer)
- Classic Controller accessory (a complete traditional gamepad)

Signed-off-by: Simon McVittie <smcv@collabora.com>

test/testevdev.c

@@ -979,14 +979,14 @@ static const GuessTest guess_tests[] =
       .bus_type = 0x0005,
       .vendor_id = 0x057e,
       .product_id = 0x0306,
-      .version = 0x8600,
+      .version = 0x0600,
       /* This one is a bit weird because some of the buttons are mapped
        * to the arrow, page up and page down keys, so it's a joystick
        * with a subset of a keyboard attached. */
       /* TODO: Should this be JOYSTICK, or even JOYSTICK|KEYBOARD? */
       .expected = SDL_UDEV_DEVICE_KEYBOARD,
-      /* SYN, KEY */
-      .ev = { 0x03 },
+      /* SYN, KEY, FF */
+      .ev = { 0x03, 0x00, 0x20 },
       .keys = {
           /* 0x00 */ ZEROx8,
           /* left, right, up down */
@@ -1001,15 +1001,21 @@ static const GuessTest guess_tests[] =
       },
     },
     {
+      /* The accelerometer and the Motion Plus gyro report as the same
+       * vendor, product, version and axes, just with different
+       * min/max/fuzz/flat parameters (not shown here). A Wiimote with an
+       * attached Motion Plus reports the accelerometer and gyro as separate
+       * evdev devices. */
       .name = "Wiimote - Motion Plus or accelerometer",
       .bus_type = 0x0005,
       .vendor_id = 0x057e,
       .product_id = 0x0306,
-      .version = 0x8600,
+      .version = 0x0600,
       .expected = SDL_UDEV_DEVICE_ACCELEROMETER,
       /* SYN, ABS */
       .ev = { 0x09 },
-      /* RX, RY, RZ */
+      /* RX, RY, RZ - even for the accelerometer, which would more
+       * conventionally be X, Y, Z */
       .abs = { 0x38 },
     },
     {
@@ -1017,24 +1023,26 @@ static const GuessTest guess_tests[] =
       .bus_type = 0x0005,
       .vendor_id = 0x057e,
       .product_id = 0x0306,
-      .version = 0x8600,
+      .version = 0x0600,
       .expected = SDL_UDEV_DEVICE_UNKNOWN,
       /* SYN, ABS */
       .ev = { 0x09 },
-      /* HAT0 to HAT3 */
-      .abs = { 0x00, 0x1f },
+      /* HAT0X, Y to HAT3X, Y */
+      .abs = { 0x00, 0x00, 0xff },
     },
     {
       .name = "Wiimote - Nunchuck",
       .bus_type = 0x0005,
       .vendor_id = 0x057e,
       .product_id = 0x0306,
-      .version = 0x8600,
+      .version = 0x0600,
       /* TODO: Should this be JOYSTICK? It has one stick and two buttons */
       .expected = SDL_UDEV_DEVICE_UNKNOWN,
       /* SYN, KEY, ABS */
       .ev = { 0x0b },
-      /* RX, RY, RZ, hat 0 */
+      /* RX, RY, RZ, hat 0 - even though this is an accelerometer, which
+       * would more conventionally be X, Y, Z, and a left joystick, which
+       * would more conventionally be X, Y */
       .abs = { 0x38, 0x00, 0x03 },
       .keys = {
           /* 0x00-0xff */ ZEROx8, ZEROx8, ZEROx8, ZEROx8,
@@ -1043,15 +1051,14 @@ static const GuessTest guess_tests[] =
       },
     },
     {
-      /* Flags guessed from kernel source code */
       .name = "Wiimote - Classic Controller",
       /* TODO: Should this be JOYSTICK, or maybe JOYSTICK|KEYBOARD?
        * It's unusual in the same ways as the Wiimote */
       .expected = SDL_UDEV_DEVICE_KEYBOARD,
       /* SYN, KEY, ABS */
       .ev = { 0x0b },
-      /* Hat 1-3 */
-      .abs = { 0x00, 0x1c },
+      /* Hat 1-3 X and Y */
+      .abs = { 0x00, 0x00, 0xfc },
       .keys = {
           /* 0x00 */ ZEROx8,
           /* left, right, up down */
@@ -1059,7 +1066,7 @@ static const GuessTest guess_tests[] =
           /* 0x80 */ ZEROx8,
           /* 0xc0 */ ZEROx8,
           /* A, B, X, Y, MODE, TL, TL2, TR, TR2 */
-          /* 0x100 */ ZEROx4, 0x00, 0x13, 0xdb, 0x10,
+          /* 0x100 */ ZEROx4, 0x00, 0x00, 0xdb, 0x13,
           /* 0x140 */ ZEROx8,
           /* next (keyboard page down), previous (keyboard page up) */
           /* 0x180 */ 0x00, 0x00, 0x80, 0x10, ZEROx4,