SYNOPSIS

struct vga_switcheroo_handler {
int (* init) (void);
int (* switchto) (enum vga_switcheroo_client_id id);
int (* switch_ddc) (enum vga_switcheroo_client_id id);
int (* power_state) (enum vga_switcheroo_client_id id,enum vga_switcheroo_state state);
enum vga_switcheroo_client_id (* get_client_id) (struct pci_dev *pdev);
};

MEMBERS

init

initialize handler. Optional. This gets called when vga_switcheroo is enabled, i.e. when two vga clients have registered. It allows the handler to perform some delayed initialization that depends on the existence of the vga clients. Currently only the radeon and amdgpu drivers use this. The return value is ignored

switchto

switch outputs to given client. Mandatory. For muxless machines this should be a no-op. Returning 0 denotes success, anything else failure (in which case the switch is aborted)

switch_ddc

switch DDC lines to given client. Optional. Should return the previous DDC owner on success or a negative int on failure

power_state

cut or reinstate power of given client. Optional. The return value is ignored

get_client_id

determine if given pci device is integrated or discrete GPU. Mandatory

DESCRIPTION

Handler callbacks. The multiplexer itself. The switchto and get_client_id methods are mandatory, all others may be set to NULL.

AUTHORS

Jesse Barnes <[email protected]>
Intel Corporation,         
        

Initial version

Laurent Pinchart <[email protected]>
Ideas on board SPRL,         
        

Driver internals

Daniel Vetter <[email protected]>
Intel Corporation,         
        

Contributions all over the place

Lukas Wunner <[email protected]>

vga_switcheroo documentation

COPYRIGHT