i2c_register_board_info — statically declare I2C devices
int __init i2c_register_board_info ( | int | busnum, |
| struct i2c_board_info const * | info, | |
| unsigned | len); |
busnumidentifies the bus to which these devices belong
infovector of i2c device descriptors
lenhow many descriptors in the vector; may be zero to reserve the specified bus number.
Systems using the Linux I2C driver stack can declare tables of board info
while they initialize. This should be done in board-specific init code
near arch_initcall time, or equivalent, before any I2C adapter driver is
registered. For example, mainboard init code could define several devices,
as could the init code for each daughtercard in a board stack.
The I2C devices will be created later, after the adapter for the relevant bus has been registered. After that moment, standard driver model tools are used to bind “new style” I2C drivers to the devices. The bus number for any device declared using this routine is not available for dynamic allocation.
The board info passed can safely be __initdata, but be careful of embedded pointers (for platform_data, functions, etc) since that won't be copied.