Driver written, will it work?

1 files changed, 112 insertions, 0 deletions

diff --git a/hid-tminit.h b/hid-tminit.h
new file mode 100644
index 0000000..820ca86
--- /dev/null
+++ b/hid-tminit.h
@@ -0,0 +1,112 @@
+/**
+ * This struct contains for each type of
+ * Thrustmaster wheel
+ * 
+ * Note: The values are stored in the CPU
+ * endianess, the USB protocols always use
+ * little endian; the macro cpu_to_le[BIT]()
+ * must be used when preparing USB packets 
+ * and vice-versa
+ */
+struct th_wheel_info
+{
+	uint16_t wheel_type;
+
+	/** See when the USB control out packet is prepared... 
+	 * @TODO The TMX seems to require to control codes to switch.
+	 * Probabilly this field needs to be converted to an array,
+	 */
+	uint16_t switch_value;
+
+	char const *const wheel_name;
+};
+
+/**
+ * All wheel I know. TO BE TESTED
+ * I can't find of a clever way to store them, but I do
+ * not think a O(n) cycle for each wheel attached to the
+ * machine is too bad...
+ */
+static const struct th_wheel_info th_wheels_infos[] =
+{
+	{0x0306, 0x0006, "Thrustmaster T150RS"},
+	{0x0206, 0x0005, "Thrustmaster T300RS"},
+	{0x0002, 0x0002, "Thrustmaster T500RS"},
+	{0x0407, 0x0001, "Thrustmaster TMX"}
+};
+
+const uint8_t th_wheels_infos_length = 4;
+
+/**
+ * This structs contains (in little endian) the response data
+ * of the wheel to the request 73
+ * 
+ * A sufficient research to understand what each field does is not
+ * beign conducted yet. The position and meaning of fields are a 
+ * just a very optimistic guess based on instinct.... 
+ */
+struct __packed tm_wheel_response
+{
+	/**
+	 * Seems to be the type of packet
+	 * - 0x0049 if is data.a (15 bytes)
+	 * - 0x0047 if is data.b (7 bytes)
+	 */
+	uint16_t type;
+
+	union
+	{
+		struct __packed
+		{
+			uint16_t field0;
+			uint16_t field1;
+			/**
+			 * Seems to be the model code of the wheel
+			 * Read table thrustmaster_wheels to values
+			 */
+			uint16_t model;
+
+			uint16_t field2;
+			uint16_t field3;
+			uint16_t field4;
+			uint16_t field5;
+		} a;
+		struct __packed
+		{
+			uint16_t field0;
+			uint16_t field1;
+			uint16_t model;
+		} b;
+	} data;
+};
+
+struct tm_wheel
+{
+	struct usb_device *usb_dev;
+	struct urb *urb;
+
+	struct usb_ctrlrequest *model_request;
+	struct tm_wheel_response *response;
+
+	struct usb_ctrlrequest *change_request;
+};
+
+/**
+ * The control packet to send to wheel */
+struct usb_ctrlrequest model_request =
+{
+	.bRequestType = 0xc1,
+	.bRequest = 73,
+	.wValue = 0,
+	.wIndex = 0,
+	.wLength = cpu_to_le16(0x0010)
+};
+
+struct usb_ctrlrequest change_request = 
+{
+	.bRequestType = 0x41,
+	.bRequest = 83,
+	.wValue = 0, // Will be filled by the driver
+	.wIndex = 0,
+	.wLength = 0
+};