3  * z/VM IUCV hypervisor console (HVC) device driver
5  * This HVC device driver provides terminal access using
64 	struct hvc_struct	*hvc;		/* HVC struct reference */  member
100 /* Array of allocated hvc iucv tty lines... */
126  * @num:	The HVC virtual terminal number (vtermno)
129  * to the HVC virtual terminal number specified as parameter @num.
199  * hvc_iucv_write() - Receive IUCV message & write data to HVC buffer.
201  * @buf:		HVC buffer for writing received terminal data.
202  * @count:		HVC buffer size.
216  * hang up (that is issued by the HVC layer).
230 	 * HVC layer to hang up the tty device. */  in hvc_iucv_write()
281 		/* The caller must ensure that the hvc is locked, which  in hvc_iucv_write()
283 		__hvc_resize(priv->hvc, *((struct winsize *) rb->mbuf->data));  in hvc_iucv_write()
302  * hvc_iucv_get_chars() - HVC get_chars operation.
303  * @vtermno:	HVC virtual terminal number.
307  * The HVC thread calls this method to read characters from the back-end.
353  * (that can be passed to HVC layer to cause a tty hangup).
447  * hvc_iucv_put_chars() - HVC put_chars operation.
448  * @vtermno:	HVC virtual terminal number.
452  * The HVC thread calls this method to write characters to the back-end.
477  * hvc_iucv_notifier_add() - HVC notifier for opening a TTY for the first time.
478  * @hp:	Pointer to the HVC device (struct hvc_struct)
503  * hvc_iucv_cleanup() - Clean up and reset a z/VM IUCV HVC instance.
556  * hvc_iucv_hangup() - Sever IUCV path and schedule hvc tty hang up
560  * up the underlying HVC terminal device.
564  * The IUCV HVC hang-up is separated into two steps:
567  * 2. Later, when the HVC thread calls hvc_iucv_get_chars(), the
568  *    IUCV_SEVERED state causes the tty hang-up in the HVC layer.
573  * the HVC layer to hang up the tty and, if so, wake up the HVC thread
576  * Special notes on hanging up a HVC terminal instantiated as console:
579  *			=> no hangup notifier is called by HVC (default)
617  * hvc_iucv_notifier_hangup() - HVC notifier for TTY hangups.
618  * @hp:		Pointer to the HVC device (struct hvc_struct)
622  * This routine notifies the HVC back-end that a tty hangup (carrier loss,
624  * The z/VM IUCV HVC device driver ignores virtual hangups (vhangup())
659  * hvc_iucv_dtr_rts() - HVC notifier for handling DTR/RTS
660  * @hp:		Pointer the HVC device (struct hvc_struct)
663  * This routine notifies the HVC back-end to raise or lower DTR/RTS
702  * hvc_iucv_notifier_del() - HVC notifier for closing a TTY for the last time.
703  * @hp:		Pointer to the HVC device (struct hvc_struct)
707  * This routine notifies the HVC back-end that the last tty device fd has been
878  * respective IUCV HVC terminal.
930 	hvc_kick();	/* wake up hvc thread */  in hvc_iucv_msg_pending()
1010 /* HVC operations */
1020 /* IUCV HVC device attributes */
1072 	/* allocate hvc device */  in hvc_iucv_alloc()
1073 	priv->hvc = hvc_alloc(id, /*		 PAGE_SIZE */  in hvc_iucv_alloc()
1075 	if (IS_ERR(priv->hvc)) {  in hvc_iucv_alloc()
1076 		rc = PTR_ERR(priv->hvc);  in hvc_iucv_alloc()
1080 	/* notify HVC thread instead of using polling */  in hvc_iucv_alloc()
1081 	priv->hvc->irq_requested = 1;  in hvc_iucv_alloc()
1104 	hvc_remove(priv->hvc);  in hvc_iucv_alloc()
1117 	hvc_remove(priv->hvc);  in hvc_iucv_destroy()
1299  * hvc_iucv_init() - z/VM IUCV HVC device driver initialization
1310 		pr_notice("The z/VM IUCV HVC device driver cannot "  in hvc_iucv_init()
1365 	 * (must be done before allocating hvc terminal devices) */  in hvc_iucv_init()
1368 		pr_err("Registering HVC terminal device as "  in hvc_iucv_init()
1377 			pr_err("Creating a new HVC terminal device "  in hvc_iucv_init()