Linux driver for Nintendo Switch controller

Reverse the controller packets and dive into the joystick/evdev API.

Description

Here is the beast, the USB controller i use to play with on my Nintendo Switch. I believe PowerA is the manufacturer of this kind of controller.

User API

I provided a user-space API (controller.c/controller.h) in addition to the kernel-space driver (driver.c)
Those functions i believe are explicit enough:
new_controller_server(void *callback_function);
stop_controller_server(pthread_t thread_id);
Once started, a controller server will receive data from the joystick API and send it back to your handler function.
Your handler function must be ready to receive data under this form:

struct js_event {
	__u32 time;     		* event timestamp in milliseconds *
	__s16 value;    		* value *
	__u8 type;      		* event type *
	__u8 number;    		* axis/button number *
};

Here is an example of a callback function:

static void	handle_event(t_controller controller)
{
	if (controller.type == EVENT_BUTTON)
		button_handler(controller);
	else if (controller.type == EVENT_AXIS)
		axis_handler(controller);
	else
		init_handler(controller);
}

more info in my user-space test program (main.c)

Compilation

Compile and load the module via Make load
Remove the module with Make unload
Additionally you can check the kernel logs via Make log or Make debug-log
Testing the driver can be done with several programs:

• Make jstest will test the controller using the linux joystick API /dev/input/jsX
• Make evtest will test the controller using the linux evdev API /dev/input/eventX
• Make run will use my own user-space API test program (using the linux joystick API /dev/input/jsX for reading input)

Demo