22  *       - pen down detection
272  * If a value other than 0 is set then WM97xx pen detection will be
288  * Handle a pen down interrupt.
328 	 * pen down operation then we need to schedule polls while the  in wm97xx_pen_irq_worker()
329 	 * pen is down.  Otherwise the machine driver is responsible  in wm97xx_pen_irq_worker()
334 			/* Data is not available immediately on pen down */  in wm97xx_pen_irq_worker()
338 		/* Let ts_reader report the pen up for debounce. */  in wm97xx_pen_irq_worker()
371  * initialise pen IRQ handler and workqueue
382 			"wm97xx-pen", wm)) {  in wm97xx_init_pen_irq()
384 			"Failed to register pen down interrupt, polling");  in wm97xx_init_pen_irq()
417 			dev_dbg(wm->dev, "pen up\n");  in wm97xx_read_samples()
423 			* pen is down, the user never will be able to  in wm97xx_read_samples()
429 			* pen is up and quicky restore it to ~one task  in wm97xx_read_samples()
430 			* switch when pen is down again.  in wm97xx_read_samples()
438 			"pen down: x=%x:%d, y=%x:%d, pressure=%x:%d\n",  in wm97xx_read_samples()
459 		dev_dbg(wm->dev, "pen down\n");  in wm97xx_read_samples()
525 	/* If we either don't have an interrupt for pen down events or  in wm97xx_ts_input_open()