tty: move hvc drivers to drivers/tty/hvc/

As requested by Arnd Bergmann, the hvc drivers are now
moved to the drivers/tty/hvc/ directory.  The virtio_console.c driver
was also moved, as it required the hvc_console.h file to be able to be
built, and it really is a hvc driver.

Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 0 insertions, 914 deletions

diff --git a/drivers/char/hvc_console.c b/drivers/char/hvc_console.c
deleted file mode 100644
index e9cba13ee800..000000000000
--- a/drivers/char/hvc_console.c
+++ /dev/null
@@ -1,914 +0,0 @@
-/*
- * Copyright (C) 2001 Anton Blanchard <anton@au.ibm.com>, IBM
- * Copyright (C) 2001 Paul Mackerras <paulus@au.ibm.com>, IBM
- * Copyright (C) 2004 Benjamin Herrenschmidt <benh@kernel.crashing.org>, IBM Corp.
- * Copyright (C) 2004 IBM Corporation
- *
- * Additional Author(s):
- *  Ryan S. Arnold <rsa@us.ibm.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- * 
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- * 
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
- */
-
-#include <linux/console.h>
-#include <linux/cpumask.h>
-#include <linux/init.h>
-#include <linux/kbd_kern.h>
-#include <linux/kernel.h>
-#include <linux/kthread.h>
-#include <linux/list.h>
-#include <linux/module.h>
-#include <linux/major.h>
-#include <linux/sysrq.h>
-#include <linux/tty.h>
-#include <linux/tty_flip.h>
-#include <linux/sched.h>
-#include <linux/spinlock.h>
-#include <linux/delay.h>
-#include <linux/freezer.h>
-#include <linux/slab.h>
-
-#include <asm/uaccess.h>
-
-#include "hvc_console.h"
-
-#define HVC_MAJOR	229
-#define HVC_MINOR	0
-
-/*
- * Wait this long per iteration while trying to push buffered data to the
- * hypervisor before allowing the tty to complete a close operation.
- */
-#define HVC_CLOSE_WAIT (HZ/100) /* 1/10 of a second */
-
-/*
- * These sizes are most efficient for vio, because they are the
- * native transfer size. We could make them selectable in the
- * future to better deal with backends that want other buffer sizes.
- */
-#define N_OUTBUF	16
-#define N_INBUF		16
-
-#define __ALIGNED__ __attribute__((__aligned__(sizeof(long))))
-
-static struct tty_driver *hvc_driver;
-static struct task_struct *hvc_task;
-
-/* Picks up late kicks after list walk but before schedule() */
-static int hvc_kicked;
-
-static int hvc_init(void);
-
-#ifdef CONFIG_MAGIC_SYSRQ
-static int sysrq_pressed;
-#endif
-
-/* dynamic list of hvc_struct instances */
-static LIST_HEAD(hvc_structs);
-
-/*
- * Protect the list of hvc_struct instances from inserts and removals during
- * list traversal.
- */
-static DEFINE_SPINLOCK(hvc_structs_lock);
-
-/*
- * This value is used to assign a tty->index value to a hvc_struct based
- * upon order of exposure via hvc_probe(), when we can not match it to
- * a console candidate registered with hvc_instantiate().
- */
-static int last_hvc = -1;
-
-/*
- * Do not call this function with either the hvc_structs_lock or the hvc_struct
- * lock held.  If successful, this function increments the kref reference
- * count against the target hvc_struct so it should be released when finished.
- */
-static struct hvc_struct *hvc_get_by_index(int index)
-{
-	struct hvc_struct *hp;
-	unsigned long flags;
-
-	spin_lock(&hvc_structs_lock);
-
-	list_for_each_entry(hp, &hvc_structs, next) {
-		spin_lock_irqsave(&hp->lock, flags);
-		if (hp->index == index) {
-			kref_get(&hp->kref);
-			spin_unlock_irqrestore(&hp->lock, flags);
-			spin_unlock(&hvc_structs_lock);
-			return hp;
-		}
-		spin_unlock_irqrestore(&hp->lock, flags);
-	}
-	hp = NULL;
-
-	spin_unlock(&hvc_structs_lock);
-	return hp;
-}
-
-
-/*
- * Initial console vtermnos for console API usage prior to full console
- * initialization.  Any vty adapter outside this range will not have usable
- * console interfaces but can still be used as a tty device.  This has to be
- * static because kmalloc will not work during early console init.
- */
-static const struct hv_ops *cons_ops[MAX_NR_HVC_CONSOLES];
-static uint32_t vtermnos[MAX_NR_HVC_CONSOLES] =
-	{[0 ... MAX_NR_HVC_CONSOLES - 1] = -1};
-
-/*
- * Console APIs, NOT TTY.  These APIs are available immediately when
- * hvc_console_setup() finds adapters.
- */
-
-static void hvc_console_print(struct console *co, const char *b,
-			      unsigned count)
-{
-	char c[N_OUTBUF] __ALIGNED__;
-	unsigned i = 0, n = 0;
-	int r, donecr = 0, index = co->index;
-
-	/* Console access attempt outside of acceptable console range. */
-	if (index >= MAX_NR_HVC_CONSOLES)
-		return;
-
-	/* This console adapter was removed so it is not usable. */
-	if (vtermnos[index] == -1)
-		return;
-
-	while (count > 0 || i > 0) {
-		if (count > 0 && i < sizeof(c)) {
-			if (b[n] == '\n' && !donecr) {
-				c[i++] = '\r';
-				donecr = 1;
-			} else {
-				c[i++] = b[n++];
-				donecr = 0;
-				--count;
-			}
-		} else {
-			r = cons_ops[index]->put_chars(vtermnos[index], c, i);
-			if (r <= 0) {
-				/* throw away chars on error */
-				i = 0;
-			} else if (r > 0) {
-				i -= r;
-				if (i > 0)
-					memmove(c, c+r, i);
-			}
-		}
-	}
-}
-
-static struct tty_driver *hvc_console_device(struct console *c, int *index)
-{
-	if (vtermnos[c->index] == -1)
-		return NULL;
-
-	*index = c->index;
-	return hvc_driver;
-}
-
-static int __init hvc_console_setup(struct console *co, char *options)
-{
-	if (co->index < 0 || co->index >= MAX_NR_HVC_CONSOLES)
-		return -ENODEV;
-
-	if (vtermnos[co->index] == -1)
-		return -ENODEV;
-
-	return 0;
-}
-
-static struct console hvc_console = {
-	.name		= "hvc",
-	.write		= hvc_console_print,
-	.device		= hvc_console_device,
-	.setup		= hvc_console_setup,
-	.flags		= CON_PRINTBUFFER,
-	.index		= -1,
-};
-
-/*
- * Early console initialization.  Precedes driver initialization.
- *
- * (1) we are first, and the user specified another driver
- * -- index will remain -1
- * (2) we are first and the user specified no driver
- * -- index will be set to 0, then we will fail setup.
- * (3)  we are first and the user specified our driver
- * -- index will be set to user specified driver, and we will fail
- * (4) we are after driver, and this initcall will register us
- * -- if the user didn't specify a driver then the console will match
- *
- * Note that for cases 2 and 3, we will match later when the io driver
- * calls hvc_instantiate() and call register again.
- */
-static int __init hvc_console_init(void)
-{
-	register_console(&hvc_console);
-	return 0;
-}
-console_initcall(hvc_console_init);
-
-/* callback when the kboject ref count reaches zero. */
-static void destroy_hvc_struct(struct kref *kref)
-{
-	struct hvc_struct *hp = container_of(kref, struct hvc_struct, kref);
-	unsigned long flags;
-
-	spin_lock(&hvc_structs_lock);
-
-	spin_lock_irqsave(&hp->lock, flags);
-	list_del(&(hp->next));
-	spin_unlock_irqrestore(&hp->lock, flags);
-
-	spin_unlock(&hvc_structs_lock);
-
-	kfree(hp);
-}
-
-/*
- * hvc_instantiate() is an early console discovery method which locates
- * consoles * prior to the vio subsystem discovering them.  Hotplugged
- * vty adapters do NOT get an hvc_instantiate() callback since they
- * appear after early console init.
- */
-int hvc_instantiate(uint32_t vtermno, int index, const struct hv_ops *ops)
-{
-	struct hvc_struct *hp;
-
-	if (index < 0 || index >= MAX_NR_HVC_CONSOLES)
-		return -1;
-
-	if (vtermnos[index] != -1)
-		return -1;
-
-	/* make sure no no tty has been registered in this index */
-	hp = hvc_get_by_index(index);
-	if (hp) {
-		kref_put(&hp->kref, destroy_hvc_struct);
-		return -1;
-	}
-
-	vtermnos[index] = vtermno;
-	cons_ops[index] = ops;
-
-	/* reserve all indices up to and including this index */
-	if (last_hvc < index)
-		last_hvc = index;
-
-	/* if this index is what the user requested, then register
-	 * now (setup won't fail at this point).  It's ok to just
-	 * call register again if previously .setup failed.
-	 */
-	if (index == hvc_console.index)
-		register_console(&hvc_console);
-
-	return 0;
-}
-EXPORT_SYMBOL_GPL(hvc_instantiate);
-
-/* Wake the sleeping khvcd */
-void hvc_kick(void)
-{
-	hvc_kicked = 1;
-	wake_up_process(hvc_task);
-}
-EXPORT_SYMBOL_GPL(hvc_kick);
-
-static void hvc_unthrottle(struct tty_struct *tty)
-{
-	hvc_kick();
-}
-
-/*
- * The TTY interface won't be used until after the vio layer has exposed the vty
- * adapter to the kernel.
- */
-static int hvc_open(struct tty_struct *tty, struct file * filp)
-{
-	struct hvc_struct *hp;
-	unsigned long flags;
-	int rc = 0;
-
-	/* Auto increments kref reference if found. */
-	if (!(hp = hvc_get_by_index(tty->index)))
-		return -ENODEV;
-
-	spin_lock_irqsave(&hp->lock, flags);
-	/* Check and then increment for fast path open. */
-	if (hp->count++ > 0) {
-		tty_kref_get(tty);
-		spin_unlock_irqrestore(&hp->lock, flags);
-		hvc_kick();
-		return 0;
-	} /* else count == 0 */
-
-	tty->driver_data = hp;
-
-	hp->tty = tty_kref_get(tty);
-
-	spin_unlock_irqrestore(&hp->lock, flags);
-
-	if (hp->ops->notifier_add)
-		rc = hp->ops->notifier_add(hp, hp->data);
-
-	/*
-	 * If the notifier fails we return an error.  The tty layer
-	 * will call hvc_close() after a failed open but we don't want to clean
-	 * up there so we'll clean up here and clear out the previously set
-	 * tty fields and return the kref reference.
-	 */
-	if (rc) {
-		spin_lock_irqsave(&hp->lock, flags);
-		hp->tty = NULL;
-		spin_unlock_irqrestore(&hp->lock, flags);
-		tty_kref_put(tty);
-		tty->driver_data = NULL;
-		kref_put(&hp->kref, destroy_hvc_struct);
-		printk(KERN_ERR "hvc_open: request_irq failed with rc %d.\n", rc);
-	}
-	/* Force wakeup of the polling thread */
-	hvc_kick();
-
-	return rc;
-}
-
-static void hvc_close(struct tty_struct *tty, struct file * filp)
-{
-	struct hvc_struct *hp;
-	unsigned long flags;
-
-	if (tty_hung_up_p(filp))
-		return;
-
-	/*
-	 * No driver_data means that this close was issued after a failed
-	 * hvc_open by the tty layer's release_dev() function and we can just
-	 * exit cleanly because the kref reference wasn't made.
-	 */
-	if (!tty->driver_data)
-		return;
-
-	hp = tty->driver_data;
-
-	spin_lock_irqsave(&hp->lock, flags);
-
-	if (--hp->count == 0) {
-		/* We are done with the tty pointer now. */
-		hp->tty = NULL;
-		spin_unlock_irqrestore(&hp->lock, flags);
-
-		if (hp->ops->notifier_del)
-			hp->ops->notifier_del(hp, hp->data);
-
-		/* cancel pending tty resize work */
-		cancel_work_sync(&hp->tty_resize);
-
-		/*
-		 * Chain calls chars_in_buffer() and returns immediately if
-		 * there is no buffered data otherwise sleeps on a wait queue
-		 * waking periodically to check chars_in_buffer().
-		 */
-		tty_wait_until_sent(tty, HVC_CLOSE_WAIT);
-	} else {
-		if (hp->count < 0)
-			printk(KERN_ERR "hvc_close %X: oops, count is %d\n",
-				hp->vtermno, hp->count);
-		spin_unlock_irqrestore(&hp->lock, flags);
-	}
-
-	tty_kref_put(tty);
-	kref_put(&hp->kref, destroy_hvc_struct);
-}
-
-static void hvc_hangup(struct tty_struct *tty)
-{
-	struct hvc_struct *hp = tty->driver_data;
-	unsigned long flags;
-	int temp_open_count;
-
-	if (!hp)
-		return;
-
-	/* cancel pending tty resize work */
-	cancel_work_sync(&hp->tty_resize);
-
-	spin_lock_irqsave(&hp->lock, flags);
-
-	/*
-	 * The N_TTY line discipline has problems such that in a close vs
-	 * open->hangup case this can be called after the final close so prevent
-	 * that from happening for now.
-	 */
-	if (hp->count <= 0) {
-		spin_unlock_irqrestore(&hp->lock, flags);
-		return;
-	}
-
-	temp_open_count = hp->count;
-	hp->count = 0;
-	hp->n_outbuf = 0;
-	hp->tty = NULL;
-
-	spin_unlock_irqrestore(&hp->lock, flags);
-
-	if (hp->ops->notifier_hangup)
-		hp->ops->notifier_hangup(hp, hp->data);
-
-	while(temp_open_count) {
-		--temp_open_count;
-		tty_kref_put(tty);
-		kref_put(&hp->kref, destroy_hvc_struct);
-	}
-}
-
-/*
- * Push buffered characters whether they were just recently buffered or waiting
- * on a blocked hypervisor.  Call this function with hp->lock held.
- */
-static int hvc_push(struct hvc_struct *hp)
-{
-	int n;
-
-	n = hp->ops->put_chars(hp->vtermno, hp->outbuf, hp->n_outbuf);
-	if (n <= 0) {
-		if (n == 0) {
-			hp->do_wakeup = 1;
-			return 0;
-		}
-		/* throw away output on error; this happens when
-		   there is no session connected to the vterm. */
-		hp->n_outbuf = 0;
-	} else
-		hp->n_outbuf -= n;
-	if (hp->n_outbuf > 0)
-		memmove(hp->outbuf, hp->outbuf + n, hp->n_outbuf);
-	else
-		hp->do_wakeup = 1;
-
-	return n;
-}
-
-static int hvc_write(struct tty_struct *tty, const unsigned char *buf, int count)
-{
-	struct hvc_struct *hp = tty->driver_data;
-	unsigned long flags;
-	int rsize, written = 0;
-
-	/* This write was probably executed during a tty close. */
-	if (!hp)
-		return -EPIPE;
-
-	if (hp->count <= 0)
-		return -EIO;
-
-	spin_lock_irqsave(&hp->lock, flags);
-
-	/* Push pending writes */
-	if (hp->n_outbuf > 0)
-		hvc_push(hp);
-
-	while (count > 0 && (rsize = hp->outbuf_size - hp->n_outbuf) > 0) {
-		if (rsize > count)
-			rsize = count;
-		memcpy(hp->outbuf + hp->n_outbuf, buf, rsize);
-		count -= rsize;
-		buf += rsize;
-		hp->n_outbuf += rsize;
-		written += rsize;
-		hvc_push(hp);
-	}
-	spin_unlock_irqrestore(&hp->lock, flags);
-
-	/*
-	 * Racy, but harmless, kick thread if there is still pending data.
-	 */
-	if (hp->n_outbuf)
-		hvc_kick();
-
-	return written;
-}
-
-/**
- * hvc_set_winsz() - Resize the hvc tty terminal window.
- * @work:	work structure.
- *
- * The routine shall not be called within an atomic context because it
- * might sleep.
- *
- * Locking:	hp->lock
- */
-static void hvc_set_winsz(struct work_struct *work)
-{
-	struct hvc_struct *hp;
-	unsigned long hvc_flags;
-	struct tty_struct *tty;
-	struct winsize ws;
-
-	hp = container_of(work, struct hvc_struct, tty_resize);
-
-	spin_lock_irqsave(&hp->lock, hvc_flags);
-	if (!hp->tty) {
-		spin_unlock_irqrestore(&hp->lock, hvc_flags);
-		return;
-	}
-	ws  = hp->ws;
-	tty = tty_kref_get(hp->tty);
-	spin_unlock_irqrestore(&hp->lock, hvc_flags);
-
-	tty_do_resize(tty, &ws);
-	tty_kref_put(tty);
-}
-
-/*
- * This is actually a contract between the driver and the tty layer outlining
- * how much write room the driver can guarantee will be sent OR BUFFERED.  This
- * driver MUST honor the return value.
- */
-static int hvc_write_room(struct tty_struct *tty)
-{
-	struct hvc_struct *hp = tty->driver_data;
-
-	if (!hp)
-		return -1;
-
-	return hp->outbuf_size - hp->n_outbuf;
-}
-
-static int hvc_chars_in_buffer(struct tty_struct *tty)
-{
-	struct hvc_struct *hp = tty->driver_data;
-
-	if (!hp)
-		return 0;
-	return hp->n_outbuf;
-}
-
-/*
- * timeout will vary between the MIN and MAX values defined here.  By default
- * and during console activity we will use a default MIN_TIMEOUT of 10.  When
- * the console is idle, we increase the timeout value on each pass through
- * msleep until we reach the max.  This may be noticeable as a brief (average
- * one second) delay on the console before the console responds to input when
- * there has been no input for some time.
- */
-#define MIN_TIMEOUT		(10)
-#define MAX_TIMEOUT		(2000)
-static u32 timeout = MIN_TIMEOUT;
-
-#define HVC_POLL_READ	0x00000001
-#define HVC_POLL_WRITE	0x00000002
-
-int hvc_poll(struct hvc_struct *hp)
-{
-	struct tty_struct *tty;
-	int i, n, poll_mask = 0;
-	char buf[N_INBUF] __ALIGNED__;
-	unsigned long flags;
-	int read_total = 0;
-	int written_total = 0;
-
-	spin_lock_irqsave(&hp->lock, flags);
-
-	/* Push pending writes */
-	if (hp->n_outbuf > 0)
-		written_total = hvc_push(hp);
-
-	/* Reschedule us if still some write pending */
-	if (hp->n_outbuf > 0) {
-		poll_mask |= HVC_POLL_WRITE;
-		/* If hvc_push() was not able to write, sleep a few msecs */
-		timeout = (written_total) ? 0 : MIN_TIMEOUT;
-	}
-
-	/* No tty attached, just skip */
-	tty = tty_kref_get(hp->tty);
-	if (tty == NULL)
-		goto bail;
-
-	/* Now check if we can get data (are we throttled ?) */
-	if (test_bit(TTY_THROTTLED, &tty->flags))
-		goto throttled;
-
-	/* If we aren't notifier driven and aren't throttled, we always
-	 * request a reschedule
-	 */
-	if (!hp->irq_requested)
-		poll_mask |= HVC_POLL_READ;
-
-	/* Read data if any */
-	for (;;) {
-		int count = tty_buffer_request_room(tty, N_INBUF);
-
-		/* If flip is full, just reschedule a later read */
-		if (count == 0) {
-			poll_mask |= HVC_POLL_READ;
-			break;
-		}
-
-		n = hp->ops->get_chars(hp->vtermno, buf, count);
-		if (n <= 0) {
-			/* Hangup the tty when disconnected from host */
-			if (n == -EPIPE) {
-				spin_unlock_irqrestore(&hp->lock, flags);
-				tty_hangup(tty);
-				spin_lock_irqsave(&hp->lock, flags);
-			} else if ( n == -EAGAIN ) {
-				/*
-				 * Some back-ends can only ensure a certain min
-				 * num of bytes read, which may be > 'count'.
-				 * Let the tty clear the flip buff to make room.
-				 */
-				poll_mask |= HVC_POLL_READ;
-			}
-			break;
-		}
-		for (i = 0; i < n; ++i) {
-#ifdef CONFIG_MAGIC_SYSRQ
-			if (hp->index == hvc_console.index) {
-				/* Handle the SysRq Hack */
-				/* XXX should support a sequence */
-				if (buf[i] == '\x0f') {	/* ^O */
-					/* if ^O is pressed again, reset
-					 * sysrq_pressed and flip ^O char */
-					sysrq_pressed = !sysrq_pressed;
-					if (sysrq_pressed)
-						continue;
-				} else if (sysrq_pressed) {
-					handle_sysrq(buf[i]);
-					sysrq_pressed = 0;
-					continue;
-				}
-			}
-#endif /* CONFIG_MAGIC_SYSRQ */
-			tty_insert_flip_char(tty, buf[i], 0);
-		}
-
-		read_total += n;
-	}
- throttled:
-	/* Wakeup write queue if necessary */
-	if (hp->do_wakeup) {
-		hp->do_wakeup = 0;
-		tty_wakeup(tty);
-	}
- bail:
-	spin_unlock_irqrestore(&hp->lock, flags);
-
-	if (read_total) {
-		/* Activity is occurring, so reset the polling backoff value to
-		   a minimum for performance. */
-		timeout = MIN_TIMEOUT;
-
-		tty_flip_buffer_push(tty);
-	}
-	if (tty)
-		tty_kref_put(tty);
-
-	return poll_mask;
-}
-EXPORT_SYMBOL_GPL(hvc_poll);
-
-/**
- * __hvc_resize() - Update terminal window size information.
- * @hp:		HVC console pointer
- * @ws:		Terminal window size structure
- *
- * Stores the specified window size information in the hvc structure of @hp.
- * The function schedule the tty resize update.
- *
- * Locking:	Locking free; the function MUST be called holding hp->lock
- */
-void __hvc_resize(struct hvc_struct *hp, struct winsize ws)
-{
-	hp->ws = ws;
-	schedule_work(&hp->tty_resize);
-}
-EXPORT_SYMBOL_GPL(__hvc_resize);
-
-/*
- * This kthread is either polling or interrupt driven.  This is determined by
- * calling hvc_poll() who determines whether a console adapter support
- * interrupts.
- */
-static int khvcd(void *unused)
-{
-	int poll_mask;
-	struct hvc_struct *hp;
-
-	set_freezable();
-	do {
-		poll_mask = 0;
-		hvc_kicked = 0;
-		try_to_freeze();
-		wmb();
-		if (!cpus_are_in_xmon()) {
-			spin_lock(&hvc_structs_lock);
-			list_for_each_entry(hp, &hvc_structs, next) {
-				poll_mask |= hvc_poll(hp);
-			}
-			spin_unlock(&hvc_structs_lock);
-		} else
-			poll_mask |= HVC_POLL_READ;
-		if (hvc_kicked)
-			continue;
-		set_current_state(TASK_INTERRUPTIBLE);
-		if (!hvc_kicked) {
-			if (poll_mask == 0)
-				schedule();
-			else {
-				if (timeout < MAX_TIMEOUT)
-					timeout += (timeout >> 6) + 1;
-
-				msleep_interruptible(timeout);
-			}
-		}
-		__set_current_state(TASK_RUNNING);
-	} while (!kthread_should_stop());
-
-	return 0;
-}
-
-static const struct tty_operations hvc_ops = {
-	.open = hvc_open,
-	.close = hvc_close,
-	.write = hvc_write,
-	.hangup = hvc_hangup,
-	.unthrottle = hvc_unthrottle,
-	.write_room = hvc_write_room,
-	.chars_in_buffer = hvc_chars_in_buffer,
-};
-
-struct hvc_struct *hvc_alloc(uint32_t vtermno, int data,
-			     const struct hv_ops *ops,
-			     int outbuf_size)
-{
-	struct hvc_struct *hp;
-	int i;
-
-	/* We wait until a driver actually comes along */
-	if (!hvc_driver) {
-		int err = hvc_init();
-		if (err)
-			return ERR_PTR(err);
-	}
-
-	hp = kzalloc(ALIGN(sizeof(*hp), sizeof(long)) + outbuf_size,
-			GFP_KERNEL);
-	if (!hp)
-		return ERR_PTR(-ENOMEM);
-
-	hp->vtermno = vtermno;
-	hp->data = data;
-	hp->ops = ops;
-	hp->outbuf_size = outbuf_size;
-	hp->outbuf = &((char *)hp)[ALIGN(sizeof(*hp), sizeof(long))];
-
-	kref_init(&hp->kref);
-
-	INIT_WORK(&hp->tty_resize, hvc_set_winsz);
-	spin_lock_init(&hp->lock);
-	spin_lock(&hvc_structs_lock);
-
-	/*
-	 * find index to use:
-	 * see if this vterm id matches one registered for console.
-	 */
-	for (i=0; i < MAX_NR_HVC_CONSOLES; i++)
-		if (vtermnos[i] == hp->vtermno &&
-		    cons_ops[i] == hp->ops)
-			break;
-
-	/* no matching slot, just use a counter */
-	if (i >= MAX_NR_HVC_CONSOLES)
-		i = ++last_hvc;
-
-	hp->index = i;
-
-	list_add_tail(&(hp->next), &hvc_structs);
-	spin_unlock(&hvc_structs_lock);
-
-	return hp;
-}
-EXPORT_SYMBOL_GPL(hvc_alloc);
-
-int hvc_remove(struct hvc_struct *hp)
-{
-	unsigned long flags;
-	struct tty_struct *tty;
-
-	spin_lock_irqsave(&hp->lock, flags);
-	tty = tty_kref_get(hp->tty);
-
-	if (hp->index < MAX_NR_HVC_CONSOLES)
-		vtermnos[hp->index] = -1;
-
-	/* Don't whack hp->irq because tty_hangup() will need to free the irq. */
-
-	spin_unlock_irqrestore(&hp->lock, flags);
-
-	/*
-	 * We 'put' the instance that was grabbed when the kref instance
-	 * was initialized using kref_init().  Let the last holder of this
-	 * kref cause it to be removed, which will probably be the tty_vhangup
-	 * below.
-	 */
-	kref_put(&hp->kref, destroy_hvc_struct);
-
-	/*
-	 * This function call will auto chain call hvc_hangup.
-	 */
-	if (tty) {
-		tty_vhangup(tty);
-		tty_kref_put(tty);
-	}
-	return 0;
-}
-EXPORT_SYMBOL_GPL(hvc_remove);
-
-/* Driver initialization: called as soon as someone uses hvc_alloc(). */
-static int hvc_init(void)
-{
-	struct tty_driver *drv;
-	int err;
-
-	/* We need more than hvc_count adapters due to hotplug additions. */
-	drv = alloc_tty_driver(HVC_ALLOC_TTY_ADAPTERS);
-	if (!drv) {
-		err = -ENOMEM;
-		goto out;
-	}
-
-	drv->owner = THIS_MODULE;
-	drv->driver_name = "hvc";
-	drv->name = "hvc";
-	drv->major = HVC_MAJOR;
-	drv->minor_start = HVC_MINOR;
-	drv->type = TTY_DRIVER_TYPE_SYSTEM;
-	drv->init_termios = tty_std_termios;
-	drv->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
-	tty_set_operations(drv, &hvc_ops);
-
-	/* Always start the kthread because there can be hotplug vty adapters
-	 * added later. */
-	hvc_task = kthread_run(khvcd, NULL, "khvcd");
-	if (IS_ERR(hvc_task)) {
-		printk(KERN_ERR "Couldn't create kthread for console.\n");
-		err = PTR_ERR(hvc_task);
-		goto put_tty;
-	}
-
-	err = tty_register_driver(drv);
-	if (err) {
-		printk(KERN_ERR "Couldn't register hvc console driver\n");
-		goto stop_thread;
-	}
-
-	/*
-	 * Make sure tty is fully registered before allowing it to be
-	 * found by hvc_console_device.
-	 */
-	smp_mb();
-	hvc_driver = drv;
-	return 0;
-
-stop_thread:
-	kthread_stop(hvc_task);
-	hvc_task = NULL;
-put_tty:
-	put_tty_driver(drv);
-out:
-	return err;
-}
-
-/* This isn't particularly necessary due to this being a console driver
- * but it is nice to be thorough.
- */
-static void __exit hvc_exit(void)
-{
-	if (hvc_driver) {
-		kthread_stop(hvc_task);
-
-		tty_unregister_driver(hvc_driver);
-		/* return tty_struct instances allocated in hvc_init(). */
-		put_tty_driver(hvc_driver);
-		unregister_console(&hvc_console);
-	}
-}
-module_exit(hvc_exit);