97 	 * it seems that 0xFE indicates that a button is still hold  in em28xx_get_key_terratec()
98 	 * down, while 0xff indicates that no button is hold down.  in em28xx_get_key_terratec()
526 			const struct em28xx_button *button;  in em28xx_query_buttons()  local
528 			button = &dev->board.buttons[j];  in em28xx_query_buttons()
530 			/* Check if button uses the current address */  in em28xx_query_buttons()
531 			if (button->reg_r != dev->button_polling_addresses[i]) {  in em28xx_query_buttons()
535 			/* Determine if button is and was pressed last time */  in em28xx_query_buttons()
536 			is_pressed = regval & button->mask;  in em28xx_query_buttons()
538 				       & button->mask;  in em28xx_query_buttons()
539 			if (button->inverted) {  in em28xx_query_buttons()
543 			/* Clear button state (if needed) */  in em28xx_query_buttons()
544 			if (is_pressed && button->reg_clearing)  in em28xx_query_buttons()
545 				em28xx_write_reg(dev, button->reg_clearing,  in em28xx_query_buttons()
546 						 (~regval & button->mask)  in em28xx_query_buttons()
547 						    | (regval & ~button->mask));  in em28xx_query_buttons()
548 			/* Handle button state */  in em28xx_query_buttons()
553 			switch (button->role) {  in em28xx_query_buttons()
572 				WARN_ONCE(1, "BUG: unhandled button role.");  in em28xx_query_buttons()
574 			/* Next button */  in em28xx_query_buttons()
591 	dev_info(&dev->intf->dev, "Registering snapshot button...\n");  in em28xx_register_snapshot_button()
601 	input_dev->name = "em28xx snapshot button";  in em28xx_register_snapshot_button()
629 		const struct em28xx_button *button = &dev->board.buttons[i];  in em28xx_init_buttons()  local
634 			if (button->reg_r == dev->button_polling_addresses[j]) {  in em28xx_init_buttons()
642 			WARN_ONCE(1, "BUG: maximum number of button polling addresses exceeded.");  in em28xx_init_buttons()
645 		/* Button role specific checks and actions */  in em28xx_init_buttons()
646 		if (button->role == EM28XX_BUTTON_SNAPSHOT) {  in em28xx_init_buttons()
650 		} else if (button->role == EM28XX_BUTTON_ILLUMINATION) {  in em28xx_init_buttons()
654 					"BUG: illumination button defined, but no illumination LED.\n");  in em28xx_init_buttons()
662 			dev->button_polling_addresses[index] = button->reg_r;  in em28xx_init_buttons()
666 		if (!button->reg_clearing)  in em28xx_init_buttons()
670 		/* Next button */  in em28xx_init_buttons()
691 		dev_info(&dev->intf->dev, "Deregistering snapshot button\n");  in em28xx_shutdown_buttons()