LCD notes (2) framebuffer Driver Framework

1. How to write character device driver

• Drive master number

• structure file_operations Structure , fill open/read/write Wait for member functions

• Registration drive ：register_chrdev(major, name, &fops)

• Entry function

• Exit function

2. Framebuffer Driver framework

Divided into two layers ：

• fbmem.c： The essential

  • Realization 、 register file_operations Structure

  • hold APP The call is forwarded down to the specific hardware driver

• xxx_fb.c： Hardware related drivers

  • Realization 、 register fb_info Structure

  • Implement hardware operation

Call relationship ：

3. How to write Framebuffer The driver

The core ：

• Distribute fb_info

  • framebuffer_alloc

• Set up fb_info

  • var

  • fbops

  • Hardware related operations

• register fb_info

  • register_framebuffer