Linux Device Drivers Development

Per device-specific data on ID table matching

In the previous section, we used platform_device_id.platform_data as a pointer. Your driver may need to support more than one device type. In this situation, you will need specific device data for each device type you support. You should then use the device ID as an index to an array that contains every possible device data, and not as a pointer address anymore. The following are detailed steps in an example:

1. We define an enumeration, depending on the device type that we need to support in our driver:

enum abx80x_chip { 
    AB0801, 
    AB0803, 
    AB0804, 
    AB0805, 
    AB1801, 
    AB1803, 
    AB1804, 
    AB1805, 
    ABX80X 
}; 

2. We define the specific data-type structure:

struct abx80x_cap { 
    u16 pn; 
bool has_tc; 
}; 

3. We fill ...