87 	 * it seems that 0xFE indicates that a button is still hold  in em28xx_get_key_terratec()
88 	 * down, while 0xff indicates that no button is hold down.  in em28xx_get_key_terratec()
516 			const struct em28xx_button *button;  in em28xx_query_buttons()  local
518 			button = &dev->board.buttons[j];  in em28xx_query_buttons()
520 			/* Check if button uses the current address */  in em28xx_query_buttons()
521 			if (button->reg_r != dev->button_polling_addresses[i]) {  in em28xx_query_buttons()
525 			/* Determine if button is and was pressed last time */  in em28xx_query_buttons()
526 			is_pressed = regval & button->mask;  in em28xx_query_buttons()
528 				       & button->mask;  in em28xx_query_buttons()
529 			if (button->inverted) {  in em28xx_query_buttons()
533 			/* Clear button state (if needed) */  in em28xx_query_buttons()
534 			if (is_pressed && button->reg_clearing)  in em28xx_query_buttons()
535 				em28xx_write_reg(dev, button->reg_clearing,  in em28xx_query_buttons()
536 						 (~regval & button->mask)  in em28xx_query_buttons()
537 						    | (regval & ~button->mask));  in em28xx_query_buttons()
538 			/* Handle button state */  in em28xx_query_buttons()
543 			switch (button->role) {  in em28xx_query_buttons()
562 				WARN_ONCE(1, "BUG: unhandled button role.");  in em28xx_query_buttons()
564 			/* Next button */  in em28xx_query_buttons()
581 	dev_info(&dev->intf->dev, "Registering snapshot button...\n");  in em28xx_register_snapshot_button()
591 	input_dev->name = "em28xx snapshot button";  in em28xx_register_snapshot_button()
619 		const struct em28xx_button *button = &dev->board.buttons[i];  in em28xx_init_buttons()  local
624 			if (button->reg_r == dev->button_polling_addresses[j]) {  in em28xx_init_buttons()
632 			WARN_ONCE(1, "BUG: maximum number of button polling addresses exceeded.");  in em28xx_init_buttons()
635 		/* Button role specific checks and actions */  in em28xx_init_buttons()
636 		if (button->role == EM28XX_BUTTON_SNAPSHOT) {  in em28xx_init_buttons()
640 		} else if (button->role == EM28XX_BUTTON_ILLUMINATION) {  in em28xx_init_buttons()
644 					"BUG: illumination button defined, but no illumination LED.\n");  in em28xx_init_buttons()
652 			dev->button_polling_addresses[index] = button->reg_r;  in em28xx_init_buttons()
656 		if (!button->reg_clearing)  in em28xx_init_buttons()
660 		/* Next button */  in em28xx_init_buttons()
681 		dev_info(&dev->intf->dev, "Deregistering snapshot button\n");  in em28xx_shutdown_buttons()