linux/drivers/net/irda/irtty-sir.c
Tejun Heo 5a0e3ad6af include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files.  percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.

percpu.h -> slab.h dependency is about to be removed.  Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability.  As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.

  http://userweb.kernel.org/~tj/misc/slabh-sweep.py

The script does the followings.

* Scan files for gfp and slab usages and update includes such that
  only the necessary includes are there.  ie. if only gfp is used,
  gfp.h, if slab is used, slab.h.

* When the script inserts a new include, it looks at the include
  blocks and try to put the new include such that its order conforms
  to its surrounding.  It's put in the include block which contains
  core kernel includes, in the same order that the rest are ordered -
  alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
  doesn't seem to be any matching order.

* If the script can't find a place to put a new include (mostly
  because the file doesn't have fitting include block), it prints out
  an error message indicating which .h file needs to be added to the
  file.

The conversion was done in the following steps.

1. The initial automatic conversion of all .c files updated slightly
   over 4000 files, deleting around 700 includes and adding ~480 gfp.h
   and ~3000 slab.h inclusions.  The script emitted errors for ~400
   files.

2. Each error was manually checked.  Some didn't need the inclusion,
   some needed manual addition while adding it to implementation .h or
   embedding .c file was more appropriate for others.  This step added
   inclusions to around 150 files.

3. The script was run again and the output was compared to the edits
   from  to make sure no file was left behind.

4. Several build tests were done and a couple of problems were fixed.
   e.g. lib/decompress_*.c used malloc/free() wrappers around slab
   APIs requiring slab.h to be added manually.

5. The script was run on all .h files but without automatically
   editing them as sprinkling gfp.h and slab.h inclusions around .h
   files could easily lead to inclusion dependency hell.  Most gfp.h
   inclusion directives were ignored as stuff from gfp.h was usually
   wildly available and often used in preprocessor macros.  Each
   slab.h inclusion directive was examined and added manually as
   necessary.

6. percpu.h was updated not to include slab.h.

7. Build test were done on the following configurations and failures
   were fixed.  CONFIG_GCOV_KERNEL was turned off for all tests (as my
   distributed build env didn't work with gcov compiles) and a few
   more options had to be turned off depending on archs to make things
   build (like ipr on powerpc/64 which failed due to missing writeq).

   * x86 and x86_64 UP and SMP allmodconfig and a custom test config.
   * powerpc and powerpc64 SMP allmodconfig
   * sparc and sparc64 SMP allmodconfig
   * ia64 SMP allmodconfig
   * s390 SMP allmodconfig
   * alpha SMP allmodconfig
   * um on x86_64 SMP allmodconfig

8. percpu.h modifications were reverted so that it could be applied as
   a separate patch and serve as bisection point.

Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.

Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-30 22:02:32 +09:00

580 lines
14 KiB
C

/*********************************************************************
*
* Filename: irtty-sir.c
* Version: 2.0
* Description: IrDA line discipline implementation
* Status: Experimental.
* Author: Dag Brattli <dagb@cs.uit.no>
* Created at: Tue Dec 9 21:18:38 1997
* Modified at: Sun Oct 27 22:13:30 2002
* Modified by: Martin Diehl <mad@mdiehl.de>
* Sources: slip.c by Laurence Culhane, <loz@holmes.demon.co.uk>
* Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
*
* Copyright (c) 1998-2000 Dag Brattli,
* Copyright (c) 2002 Martin Diehl,
* All Rights Reserved.
*
* 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.
*
* Neither Dag Brattli nor University of Tromsø admit liability nor
* provide warranty for any of this software. This material is
* provided "AS-IS" and at no charge.
*
********************************************************************/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/init.h>
#include <asm/uaccess.h>
#include <linux/delay.h>
#include <linux/mutex.h>
#include <net/irda/irda.h>
#include <net/irda/irda_device.h>
#include "sir-dev.h"
#include "irtty-sir.h"
static int qos_mtt_bits = 0x03; /* 5 ms or more */
module_param(qos_mtt_bits, int, 0);
MODULE_PARM_DESC(qos_mtt_bits, "Minimum Turn Time");
/* ------------------------------------------------------- */
/* device configuration callbacks always invoked with irda-thread context */
/* find out, how many chars we have in buffers below us
* this is allowed to lie, i.e. return less chars than we
* actually have. The returned value is used to determine
* how long the irdathread should wait before doing the
* real blocking wait_until_sent()
*/
static int irtty_chars_in_buffer(struct sir_dev *dev)
{
struct sirtty_cb *priv = dev->priv;
IRDA_ASSERT(priv != NULL, return -1;);
IRDA_ASSERT(priv->magic == IRTTY_MAGIC, return -1;);
return tty_chars_in_buffer(priv->tty);
}
/* Wait (sleep) until underlaying hardware finished transmission
* i.e. hardware buffers are drained
* this must block and not return before all characters are really sent
*
* If the tty sits on top of a 16550A-like uart, there are typically
* up to 16 bytes in the fifo - f.e. 9600 bps 8N1 needs 16.7 msec
*
* With usbserial the uart-fifo is basically replaced by the converter's
* outgoing endpoint buffer, which can usually hold 64 bytes (at least).
* With pl2303 it appears we are safe with 60msec here.
*
* I really wish all serial drivers would provide
* correct implementation of wait_until_sent()
*/
#define USBSERIAL_TX_DONE_DELAY 60
static void irtty_wait_until_sent(struct sir_dev *dev)
{
struct sirtty_cb *priv = dev->priv;
struct tty_struct *tty;
IRDA_ASSERT(priv != NULL, return;);
IRDA_ASSERT(priv->magic == IRTTY_MAGIC, return;);
tty = priv->tty;
if (tty->ops->wait_until_sent) {
tty->ops->wait_until_sent(tty, msecs_to_jiffies(100));
}
else {
msleep(USBSERIAL_TX_DONE_DELAY);
}
}
/*
* Function irtty_change_speed (dev, speed)
*
* Change the speed of the serial port.
*
* This may sleep in set_termios (usbserial driver f.e.) and must
* not be called from interrupt/timer/tasklet therefore.
* All such invocations are deferred to kIrDAd now so we can sleep there.
*/
static int irtty_change_speed(struct sir_dev *dev, unsigned speed)
{
struct sirtty_cb *priv = dev->priv;
struct tty_struct *tty;
struct ktermios old_termios;
int cflag;
IRDA_ASSERT(priv != NULL, return -1;);
IRDA_ASSERT(priv->magic == IRTTY_MAGIC, return -1;);
tty = priv->tty;
mutex_lock(&tty->termios_mutex);
old_termios = *(tty->termios);
cflag = tty->termios->c_cflag;
tty_encode_baud_rate(tty, speed, speed);
if (tty->ops->set_termios)
tty->ops->set_termios(tty, &old_termios);
priv->io.speed = speed;
mutex_unlock(&tty->termios_mutex);
return 0;
}
/*
* Function irtty_set_dtr_rts (dev, dtr, rts)
*
* This function can be used by dongles etc. to set or reset the status
* of the dtr and rts lines
*/
static int irtty_set_dtr_rts(struct sir_dev *dev, int dtr, int rts)
{
struct sirtty_cb *priv = dev->priv;
int set = 0;
int clear = 0;
IRDA_ASSERT(priv != NULL, return -1;);
IRDA_ASSERT(priv->magic == IRTTY_MAGIC, return -1;);
if (rts)
set |= TIOCM_RTS;
else
clear |= TIOCM_RTS;
if (dtr)
set |= TIOCM_DTR;
else
clear |= TIOCM_DTR;
/*
* We can't use ioctl() because it expects a non-null file structure,
* and we don't have that here.
* This function is not yet defined for all tty driver, so
* let's be careful... Jean II
*/
IRDA_ASSERT(priv->tty->ops->tiocmset != NULL, return -1;);
priv->tty->ops->tiocmset(priv->tty, NULL, set, clear);
return 0;
}
/* ------------------------------------------------------- */
/* called from sir_dev when there is more data to send
* context is either netdev->hard_xmit or some transmit-completion bh
* i.e. we are under spinlock here and must not sleep.
*/
static int irtty_do_write(struct sir_dev *dev, const unsigned char *ptr, size_t len)
{
struct sirtty_cb *priv = dev->priv;
struct tty_struct *tty;
int writelen;
IRDA_ASSERT(priv != NULL, return -1;);
IRDA_ASSERT(priv->magic == IRTTY_MAGIC, return -1;);
tty = priv->tty;
if (!tty->ops->write)
return 0;
set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
writelen = tty_write_room(tty);
if (writelen > len)
writelen = len;
return tty->ops->write(tty, ptr, writelen);
}
/* ------------------------------------------------------- */
/* irda line discipline callbacks */
/*
* Function irtty_receive_buf( tty, cp, count)
*
* Handle the 'receiver data ready' interrupt. This function is called
* by the 'tty_io' module in the kernel when a block of IrDA data has
* been received, which can now be decapsulated and delivered for
* further processing
*
* calling context depends on underlying driver and tty->low_latency!
* for example (low_latency: 1 / 0):
* serial.c: uart-interrupt / softint
* usbserial: urb-complete-interrupt / softint
*/
static void irtty_receive_buf(struct tty_struct *tty, const unsigned char *cp,
char *fp, int count)
{
struct sir_dev *dev;
struct sirtty_cb *priv = tty->disc_data;
int i;
IRDA_ASSERT(priv != NULL, return;);
IRDA_ASSERT(priv->magic == IRTTY_MAGIC, return;);
if (unlikely(count==0)) /* yes, this happens */
return;
dev = priv->dev;
if (!dev) {
IRDA_WARNING("%s(), not ready yet!\n", __func__);
return;
}
for (i = 0; i < count; i++) {
/*
* Characters received with a parity error, etc?
*/
if (fp && *fp++) {
IRDA_DEBUG(0, "Framing or parity error!\n");
sirdev_receive(dev, NULL, 0); /* notify sir_dev (updating stats) */
return;
}
}
sirdev_receive(dev, cp, count);
}
/*
* Function irtty_write_wakeup (tty)
*
* Called by the driver when there's room for more data. If we have
* more packets to send, we send them here.
*
*/
static void irtty_write_wakeup(struct tty_struct *tty)
{
struct sirtty_cb *priv = tty->disc_data;
IRDA_ASSERT(priv != NULL, return;);
IRDA_ASSERT(priv->magic == IRTTY_MAGIC, return;);
clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
if (priv->dev)
sirdev_write_complete(priv->dev);
}
/* ------------------------------------------------------- */
/*
* Function irtty_stop_receiver (tty, stop)
*
*/
static inline void irtty_stop_receiver(struct tty_struct *tty, int stop)
{
struct ktermios old_termios;
int cflag;
mutex_lock(&tty->termios_mutex);
old_termios = *(tty->termios);
cflag = tty->termios->c_cflag;
if (stop)
cflag &= ~CREAD;
else
cflag |= CREAD;
tty->termios->c_cflag = cflag;
if (tty->ops->set_termios)
tty->ops->set_termios(tty, &old_termios);
mutex_unlock(&tty->termios_mutex);
}
/*****************************************************************/
/* serialize ldisc open/close with sir_dev */
static DEFINE_MUTEX(irtty_mutex);
/* notifier from sir_dev when irda% device gets opened (ifup) */
static int irtty_start_dev(struct sir_dev *dev)
{
struct sirtty_cb *priv;
struct tty_struct *tty;
/* serialize with ldisc open/close */
mutex_lock(&irtty_mutex);
priv = dev->priv;
if (unlikely(!priv || priv->magic!=IRTTY_MAGIC)) {
mutex_unlock(&irtty_mutex);
return -ESTALE;
}
tty = priv->tty;
if (tty->ops->start)
tty->ops->start(tty);
/* Make sure we can receive more data */
irtty_stop_receiver(tty, FALSE);
mutex_unlock(&irtty_mutex);
return 0;
}
/* notifier from sir_dev when irda% device gets closed (ifdown) */
static int irtty_stop_dev(struct sir_dev *dev)
{
struct sirtty_cb *priv;
struct tty_struct *tty;
/* serialize with ldisc open/close */
mutex_lock(&irtty_mutex);
priv = dev->priv;
if (unlikely(!priv || priv->magic!=IRTTY_MAGIC)) {
mutex_unlock(&irtty_mutex);
return -ESTALE;
}
tty = priv->tty;
/* Make sure we don't receive more data */
irtty_stop_receiver(tty, TRUE);
if (tty->ops->stop)
tty->ops->stop(tty);
mutex_unlock(&irtty_mutex);
return 0;
}
/* ------------------------------------------------------- */
static struct sir_driver sir_tty_drv = {
.owner = THIS_MODULE,
.driver_name = "sir_tty",
.start_dev = irtty_start_dev,
.stop_dev = irtty_stop_dev,
.do_write = irtty_do_write,
.chars_in_buffer = irtty_chars_in_buffer,
.wait_until_sent = irtty_wait_until_sent,
.set_speed = irtty_change_speed,
.set_dtr_rts = irtty_set_dtr_rts,
};
/* ------------------------------------------------------- */
/*
* Function irtty_ioctl (tty, file, cmd, arg)
*
* The Swiss army knife of system calls :-)
*
*/
static int irtty_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg)
{
struct irtty_info { char name[6]; } info;
struct sir_dev *dev;
struct sirtty_cb *priv = tty->disc_data;
int err = 0;
IRDA_ASSERT(priv != NULL, return -ENODEV;);
IRDA_ASSERT(priv->magic == IRTTY_MAGIC, return -EBADR;);
IRDA_DEBUG(3, "%s(cmd=0x%X)\n", __func__, cmd);
dev = priv->dev;
IRDA_ASSERT(dev != NULL, return -1;);
switch (cmd) {
case IRTTY_IOCTDONGLE:
/* this call blocks for completion */
err = sirdev_set_dongle(dev, (IRDA_DONGLE) arg);
break;
case IRTTY_IOCGET:
IRDA_ASSERT(dev->netdev != NULL, return -1;);
memset(&info, 0, sizeof(info));
strncpy(info.name, dev->netdev->name, sizeof(info.name)-1);
if (copy_to_user((void __user *)arg, &info, sizeof(info)))
err = -EFAULT;
break;
default:
err = tty_mode_ioctl(tty, file, cmd, arg);
break;
}
return err;
}
/*
* Function irtty_open(tty)
*
* This function is called by the TTY module when the IrDA line
* discipline is called for. Because we are sure the tty line exists,
* we only have to link it to a free IrDA channel.
*/
static int irtty_open(struct tty_struct *tty)
{
struct sir_dev *dev;
struct sirtty_cb *priv;
int ret = 0;
/* Module stuff handled via irda_ldisc.owner - Jean II */
/* First make sure we're not already connected. */
if (tty->disc_data != NULL) {
priv = tty->disc_data;
if (priv && priv->magic == IRTTY_MAGIC) {
ret = -EEXIST;
goto out;
}
tty->disc_data = NULL; /* ### */
}
/* stop the underlying driver */
irtty_stop_receiver(tty, TRUE);
if (tty->ops->stop)
tty->ops->stop(tty);
tty_driver_flush_buffer(tty);
/* apply mtt override */
sir_tty_drv.qos_mtt_bits = qos_mtt_bits;
/* get a sir device instance for this driver */
dev = sirdev_get_instance(&sir_tty_drv, tty->name);
if (!dev) {
ret = -ENODEV;
goto out;
}
/* allocate private device info block */
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
goto out_put;
priv->magic = IRTTY_MAGIC;
priv->tty = tty;
priv->dev = dev;
/* serialize with start_dev - in case we were racing with ifup */
mutex_lock(&irtty_mutex);
dev->priv = priv;
tty->disc_data = priv;
tty->receive_room = 65536;
mutex_unlock(&irtty_mutex);
IRDA_DEBUG(0, "%s - %s: irda line discipline opened\n", __func__, tty->name);
return 0;
out_put:
sirdev_put_instance(dev);
out:
return ret;
}
/*
* Function irtty_close (tty)
*
* Close down a IrDA channel. This means flushing out any pending queues,
* and then restoring the TTY line discipline to what it was before it got
* hooked to IrDA (which usually is TTY again).
*/
static void irtty_close(struct tty_struct *tty)
{
struct sirtty_cb *priv = tty->disc_data;
IRDA_ASSERT(priv != NULL, return;);
IRDA_ASSERT(priv->magic == IRTTY_MAGIC, return;);
/* Hm, with a dongle attached the dongle driver wants
* to close the dongle - which requires the use of
* some tty write and/or termios or ioctl operations.
* Are we allowed to call those when already requested
* to shutdown the ldisc?
* If not, we should somehow mark the dev being staled.
* Question remains, how to close the dongle in this case...
* For now let's assume we are granted to issue tty driver calls
* until we return here from the ldisc close. I'm just wondering
* how this behaves with hotpluggable serial hardware like
* rs232-pcmcia card or usb-serial...
*
* priv->tty = NULL?;
*/
/* we are dead now */
tty->disc_data = NULL;
sirdev_put_instance(priv->dev);
/* Stop tty */
irtty_stop_receiver(tty, TRUE);
clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
if (tty->ops->stop)
tty->ops->stop(tty);
kfree(priv);
IRDA_DEBUG(0, "%s - %s: irda line discipline closed\n", __func__, tty->name);
}
/* ------------------------------------------------------- */
static struct tty_ldisc_ops irda_ldisc = {
.magic = TTY_LDISC_MAGIC,
.name = "irda",
.flags = 0,
.open = irtty_open,
.close = irtty_close,
.read = NULL,
.write = NULL,
.ioctl = irtty_ioctl,
.poll = NULL,
.receive_buf = irtty_receive_buf,
.write_wakeup = irtty_write_wakeup,
.owner = THIS_MODULE,
};
/* ------------------------------------------------------- */
static int __init irtty_sir_init(void)
{
int err;
if ((err = tty_register_ldisc(N_IRDA, &irda_ldisc)) != 0)
IRDA_ERROR("IrDA: can't register line discipline (err = %d)\n",
err);
return err;
}
static void __exit irtty_sir_cleanup(void)
{
int err;
if ((err = tty_unregister_ldisc(N_IRDA))) {
IRDA_ERROR("%s(), can't unregister line discipline (err = %d)\n",
__func__, err);
}
}
module_init(irtty_sir_init);
module_exit(irtty_sir_cleanup);
MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
MODULE_DESCRIPTION("IrDA TTY device driver");
MODULE_ALIAS_LDISC(N_IRDA);
MODULE_LICENSE("GPL");