gpu/vga/vga_switcheroo.c

70  * clients. The mux is called the handler. Muxless machines also register a
71  * handler to control the power state of the discrete GPU, its ->switchto
87  * switched to it, provided that the handler supports this. Switching
99  * @id: client identifier. Determining the id requires the handler,
133  *	Prerequisite is the registration of two GPUs and a handler
140  * @handler: registered handler
141  * @handler_flags: flags of registered handler
159 	const struct vga_switcheroo_handler *handler;
181 	/* we're ready if we get two clients + handler */
183 	       vgasr_priv.registered_clients == 2 && vgasr_priv.handler;
191 	/* call the handler to init */
192 	if (vgasr_priv.handler->init)
193 		vgasr_priv.handler->init();
200 		ret = vgasr_priv.handler->get_client_id(client->pdev);
212 		ret = vgasr_priv.handler->get_client_id(client->vga_dev);
226  * vga_switcheroo_register_handler() - register handler
227  * @handler: handler callbacks
228  * @handler_flags: handler flags
230  * Register handler. Enable vga_switcheroo if two vga clients have already
233  * Return: 0 on success, -EINVAL if a handler was already registered.
236 			  const struct vga_switcheroo_handler *handler,
240 	if (vgasr_priv.handler) {
245 	vgasr_priv.handler = handler;
257  * vga_switcheroo_unregister_handler() - unregister handler
259  * Unregister handler. Disable vga_switcheroo.
266 	vgasr_priv.handler = NULL;
278  * vga_switcheroo_handler_flags() - obtain handler flags
280  * Helper for clients to obtain the handler flags bitmask.
282  * Return: Handler flags. A value of 0 means that no handler is registered
283  * or that the handler has no special capabilities.
333  * handler have already registered. The power state of the client is assumed
370 	 * handler are registered. Get audio client id from bound GPU client
377 		id = vgasr_priv.handler->get_client_id(vga_dev);
551  * Specifically, %-ENODEV if no handler has registered or if the handler
553  * returned by the handler is propagated back to the caller.
564 	if (!vgasr_priv.handler || !vgasr_priv.handler->switch_ddc) {
569 	id = vgasr_priv.handler->get_client_id(pdev);
570 	vgasr_priv.old_ddc_owner = vgasr_priv.handler->switch_ddc(id);
585  * Specifically, %-ENODEV if no handler has registered or if the handler
587  * returned by the handler is propagated back to the caller.
600 		id = vgasr_priv.handler->get_client_id(pdev);
602 			ret = vgasr_priv.handler->switch_ddc(
616  * two GPU drivers and one handler have registered with vga_switcheroo.
676 	if (vgasr_priv.handler->power_state)
677 		vgasr_priv.handler->power_state(client->id, VGA_SWITCHEROO_ON);
690 	if (vgasr_priv.handler->power_state)
691 		vgasr_priv.handler->power_state(client->id, VGA_SWITCHEROO_OFF);
742 	ret = vgasr_priv.handler->switchto(new_client->id);
861 		ret = vgasr_priv.handler->switchto(client_id);
978  * After the GPU has been suspended, the handler needs to be called to cut
982  * calls to the handler.
1000 	if (!vgasr_priv.handler->power_state)
1010 	vgasr_priv.handler->power_state(client->id, state);
1023 	if (vgasr_priv.handler->switchto) {
1025 		vgasr_priv.handler->switchto(VGA_SWITCHEROO_IGD);
1051  * After the GPU has been suspended, the handler needs to be called to cut
1054  * by the requisite calls to the handler. It needs only be called on platforms