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How can I write a simple device driver using dumb buffers? I have searched far and wide but I can't find anything. I'm forced to write a framebuffer driver. Onc

• Jasper_ 6y ago
  For the simplest case, where you have contiguous memory for your framebuffer storage and no MMIO, try the CMA helpers: https://github.com/torvalds/linux/blob/master/drivers/gpu/drm/drm_gem_cma_helper.c https://github.com/torvalds/linux/blob/master/drivers/gpu/dr... I wrote a basic device driver for a platform I worked on. It's since been upstreamed and gotten more eyeballs, but it's still relatively simple. https://github.com/torvalds/linux/blob/master/drivers/gpu/drm/meson/meson_drv.c https://github.com/torvalds/linux/blob/master/drivers/gpu/dr...