3  * z/VM IUCV hypervisor console (HVC) device driver
5  * This HVC device driver provides terminal access using
65 	struct hvc_struct	*hvc;		/* HVC struct reference */  member
101 /* Array of allocated hvc iucv tty lines... */
127  * @num:	The HVC virtual terminal number (vtermno)
130  * to the HVC virtual terminal number specified as parameter @num.
200  * hvc_iucv_write() - Receive IUCV message & write data to HVC buffer.
202  * @buf:		HVC buffer for writing received terminal data.
203  * @count:		HVC buffer size.
217  * hang up (that is issued by the HVC layer).
231 	 * HVC layer to hang up the tty device. */  in hvc_iucv_write()
282 		/* The caller must ensure that the hvc is locked, which  in hvc_iucv_write()
284 		__hvc_resize(priv->hvc, *((struct winsize *) rb->mbuf->data));  in hvc_iucv_write()
303  * hvc_iucv_get_chars() - HVC get_chars operation.
304  * @vtermno:	HVC virtual terminal number.
308  * The HVC thread calls this method to read characters from the back-end.
354  * (that can be passed to HVC layer to cause a tty hangup).
450  * hvc_iucv_put_chars() - HVC put_chars operation.
451  * @vtermno:	HVC virtual terminal number.
455  * The HVC thread calls this method to write characters to the back-end.
480  * hvc_iucv_notifier_add() - HVC notifier for opening a TTY for the first time.
481  * @hp:	Pointer to the HVC device (struct hvc_struct)
506  * hvc_iucv_cleanup() - Clean up and reset a z/VM IUCV HVC instance.
559  * hvc_iucv_hangup() - Sever IUCV path and schedule hvc tty hang up
563  * up the underlying HVC terminal device.
567  * The IUCV HVC hang-up is separated into two steps:
570  * 2. Later, when the HVC thread calls hvc_iucv_get_chars(), the
571  *    IUCV_SEVERED state causes the tty hang-up in the HVC layer.
576  * the HVC layer to hang up the tty and, if so, wake up the HVC thread
579  * Special notes on hanging up a HVC terminal instantiated as console:
582  *			=> no hangup notifier is called by HVC (default)
620  * hvc_iucv_notifier_hangup() - HVC notifier for TTY hangups.
621  * @hp:		Pointer to the HVC device (struct hvc_struct)
625  * This routine notifies the HVC back-end that a tty hangup (carrier loss,
627  * The z/VM IUCV HVC device driver ignores virtual hangups (vhangup())
662  * hvc_iucv_dtr_rts() - HVC notifier for handling DTR/RTS
663  * @hp:		Pointer the HVC device (struct hvc_struct)
666  * This routine notifies the HVC back-end to raise or lower DTR/RTS
705  * hvc_iucv_notifier_del() - HVC notifier for closing a TTY for the last time.
706  * @hp:		Pointer to the HVC device (struct hvc_struct)
710  * This routine notifies the HVC back-end that the last tty device fd has been
881  * respective IUCV HVC terminal.
933 	hvc_kick();	/* wake up hvc thread */  in hvc_iucv_msg_pending()
971  * @dev:	IUVC HVC terminal device
974  * trigger a hang-up of the underlying HVC terminal.
989  * @dev:	IUVC HVC terminal device
991  * Wake up the HVC thread to trigger hang-up and respective
992  * HVC back-end notifier invocations.
1044 /* HVC operations */
1061 /* IUCV HVC device driver */
1068 /* IUCV HVC device attributes */
1121 	/* allocate hvc device */  in hvc_iucv_alloc()
1122 	priv->hvc = hvc_alloc(HVC_IUCV_MAGIC + id, /*		  PAGE_SIZE */  in hvc_iucv_alloc()
1124 	if (IS_ERR(priv->hvc)) {  in hvc_iucv_alloc()
1125 		rc = PTR_ERR(priv->hvc);  in hvc_iucv_alloc()
1129 	/* notify HVC thread instead of using polling */  in hvc_iucv_alloc()
1130 	priv->hvc->irq_requested = 1;  in hvc_iucv_alloc()
1160 	hvc_remove(priv->hvc);  in hvc_iucv_alloc()
1173 	hvc_remove(priv->hvc);  in hvc_iucv_destroy()
1355  * hvc_iucv_init() - z/VM IUCV HVC device driver initialization
1366 		pr_notice("The z/VM IUCV HVC device driver cannot "  in hvc_iucv_init()
1379 	/* register IUCV HVC device driver */  in hvc_iucv_init()
1426 	 * (must be done before allocating hvc terminal devices) */  in hvc_iucv_init()
1429 		pr_err("Registering HVC terminal device as "  in hvc_iucv_init()
1438 			pr_err("Creating a new HVC terminal device "  in hvc_iucv_init()