[Verse 1] Deep in the kernel space where the magic starts Hardware meets software through our driver parts Register your module with the init call Clean exit function catches when you fall Character device or block device type Network and platform drivers in the pipeline [Chorus] Load, probe, remove - the driver lifecycle Major minor numbers keep the handles right Request that IRQ and map your memory space Kernel APIs guide you to the hardware place Module load, module probe, module clean and go That's the way the kernel drivers always flow [Verse 2] File operations structure holds your function pointers Open, close, and read write are the main appointees Copy from user, copy to user safe Never trust the user space data that they gave Spin locks and mutexes protect your shared state Atomic operations when you cannot wait [Chorus] Load, probe, remove - the driver lifecycle Major minor numbers keep the handles right Request that IRQ and map your memory space Kernel APIs guide you to the hardware place Module load, module probe, module clean and go That's the way the kernel drivers always flow [Bridge] DMA coherent allocation for the big data moves Virtual to physical address translation rules Interrupt service routines keep the system smooth Bottom half and top half split the processing groove Platform device tree describes your hardware map GPIO and I2C through the kernel API wrap [Verse 3] Error handling matters in the kernel domain Return negative values for the error chain Reference counting keeps your objects alive No malloc here, use kmalloc to survive Module parameters let the user configure Proc and sys FS make your stats secure [Chorus] Load, probe, remove - the driver lifecycle Major minor numbers keep the handles right Request that IRQ and map your memory space Kernel APIs guide you to the hardware place Module load, module probe, module clean and go That's the way the kernel drivers always flow [Outro] From hardware up to kernel space we climb One driver at a time, one driver at a time Interface the world with your C module code Driver development is the system's road
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