linux/drivers/char/lp.c
Arnd Bergmann 45a2d64696 lp: fix sparc64 LPSETTIMEOUT ioctl
The layout of struct timeval is different on sparc64 from
anything else, and the patch I did long ago failed to take
this into account.

Change it now to handle sparc64 user space correctly again.

Quite likely nobody cares about parallel ports on sparc64,
but there is no reason not to fix it.

Cc: stable@vger.kernel.org
Fixes: 9a45048408 ("lp: support 64-bit time_t user space")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Link: https://lore.kernel.org/r/20191108203435.112759-7-arnd@arndb.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-11-13 19:08:22 +08:00

1126 lines
27 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Generic parallel printer driver
*
* Copyright (C) 1992 by Jim Weigand and Linus Torvalds
* Copyright (C) 1992,1993 by Michael K. Johnson
* - Thanks much to Gunter Windau for pointing out to me where the error
* checking ought to be.
* Copyright (C) 1993 by Nigel Gamble (added interrupt code)
* Copyright (C) 1994 by Alan Cox (Modularised it)
* LPCAREFUL, LPABORT, LPGETSTATUS added by Chris Metcalf, metcalf@lcs.mit.edu
* Statistics and support for slow printers by Rob Janssen, rob@knoware.nl
* "lp=" command line parameters added by Grant Guenther, grant@torque.net
* lp_read (Status readback) support added by Carsten Gross,
* carsten@sol.wohnheim.uni-ulm.de
* Support for parport by Philip Blundell <philb@gnu.org>
* Parport sharing hacking by Andrea Arcangeli
* Fixed kernel_(to/from)_user memory copy to check for errors
* by Riccardo Facchetti <fizban@tin.it>
* 22-JAN-1998 Added support for devfs Richard Gooch <rgooch@atnf.csiro.au>
* Redesigned interrupt handling for handle printers with buggy handshake
* by Andrea Arcangeli, 11 May 1998
* Full efficient handling of printer with buggy irq handshake (now I have
* understood the meaning of the strange handshake). This is done sending new
* characters if the interrupt is just happened, even if the printer say to
* be still BUSY. This is needed at least with Epson Stylus Color. To enable
* the new TRUST_IRQ mode read the `LP OPTIMIZATION' section below...
* Fixed the irq on the rising edge of the strobe case.
* Obsoleted the CAREFUL flag since a printer that doesn' t work with
* CAREFUL will block a bit after in lp_check_status().
* Andrea Arcangeli, 15 Oct 1998
* Obsoleted and removed all the lowlevel stuff implemented in the last
* month to use the IEEE1284 functions (that handle the _new_ compatibilty
* mode fine).
*/
/* This driver should, in theory, work with any parallel port that has an
* appropriate low-level driver; all I/O is done through the parport
* abstraction layer.
*
* If this driver is built into the kernel, you can configure it using the
* kernel command-line. For example:
*
* lp=parport1,none,parport2 (bind lp0 to parport1, disable lp1 and
* bind lp2 to parport2)
*
* lp=auto (assign lp devices to all ports that
* have printers attached, as determined
* by the IEEE-1284 autoprobe)
*
* lp=reset (reset the printer during
* initialisation)
*
* lp=off (disable the printer driver entirely)
*
* If the driver is loaded as a module, similar functionality is available
* using module parameters. The equivalent of the above commands would be:
*
* # insmod lp.o parport=1,none,2
*
* # insmod lp.o parport=auto
*
* # insmod lp.o reset=1
*/
/* COMPATIBILITY WITH OLD KERNELS
*
* Under Linux 2.0 and previous versions, lp devices were bound to ports at
* particular I/O addresses, as follows:
*
* lp0 0x3bc
* lp1 0x378
* lp2 0x278
*
* The new driver, by default, binds lp devices to parport devices as it
* finds them. This means that if you only have one port, it will be bound
* to lp0 regardless of its I/O address. If you need the old behaviour, you
* can force it using the parameters described above.
*/
/*
* The new interrupt handling code take care of the buggy handshake
* of some HP and Epson printer:
* ___
* ACK _______________ ___________
* |__|
* ____
* BUSY _________ _______
* |____________|
*
* I discovered this using the printer scanner that you can find at:
*
* ftp://e-mind.com/pub/linux/pscan/
*
* 11 May 98, Andrea Arcangeli
*
* My printer scanner run on an Epson Stylus Color show that such printer
* generates the irq on the _rising_ edge of the STROBE. Now lp handle
* this case fine too.
*
* 15 Oct 1998, Andrea Arcangeli
*
* The so called `buggy' handshake is really the well documented
* compatibility mode IEEE1284 handshake. They changed the well known
* Centronics handshake acking in the middle of busy expecting to not
* break drivers or legacy application, while they broken linux lp
* until I fixed it reverse engineering the protocol by hand some
* month ago...
*
* 14 Dec 1998, Andrea Arcangeli
*
* Copyright (C) 2000 by Tim Waugh (added LPSETTIMEOUT ioctl)
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/sched/signal.h>
#include <linux/slab.h>
#include <linux/fcntl.h>
#include <linux/delay.h>
#include <linux/poll.h>
#include <linux/console.h>
#include <linux/device.h>
#include <linux/wait.h>
#include <linux/jiffies.h>
#include <linux/mutex.h>
#include <linux/compat.h>
#include <linux/parport.h>
#undef LP_STATS
#include <linux/lp.h>
#include <asm/irq.h>
#include <linux/uaccess.h>
/* if you have more than 8 printers, remember to increase LP_NO */
#define LP_NO 8
static DEFINE_MUTEX(lp_mutex);
static struct lp_struct lp_table[LP_NO];
static int port_num[LP_NO];
static unsigned int lp_count = 0;
static struct class *lp_class;
#ifdef CONFIG_LP_CONSOLE
static struct parport *console_registered;
#endif /* CONFIG_LP_CONSOLE */
#undef LP_DEBUG
/* Bits used to manage claiming the parport device */
#define LP_PREEMPT_REQUEST 1
#define LP_PARPORT_CLAIMED 2
/* --- low-level port access ----------------------------------- */
#define r_dtr(x) (parport_read_data(lp_table[(x)].dev->port))
#define r_str(x) (parport_read_status(lp_table[(x)].dev->port))
#define w_ctr(x,y) do { parport_write_control(lp_table[(x)].dev->port, (y)); } while (0)
#define w_dtr(x,y) do { parport_write_data(lp_table[(x)].dev->port, (y)); } while (0)
/* Claim the parport or block trying unless we've already claimed it */
static void lp_claim_parport_or_block(struct lp_struct *this_lp)
{
if (!test_and_set_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) {
parport_claim_or_block(this_lp->dev);
}
}
/* Claim the parport or block trying unless we've already claimed it */
static void lp_release_parport(struct lp_struct *this_lp)
{
if (test_and_clear_bit(LP_PARPORT_CLAIMED, &this_lp->bits)) {
parport_release(this_lp->dev);
}
}
static int lp_preempt(void *handle)
{
struct lp_struct *this_lp = (struct lp_struct *)handle;
set_bit(LP_PREEMPT_REQUEST, &this_lp->bits);
return 1;
}
/*
* Try to negotiate to a new mode; if unsuccessful negotiate to
* compatibility mode. Return the mode we ended up in.
*/
static int lp_negotiate(struct parport *port, int mode)
{
if (parport_negotiate(port, mode) != 0) {
mode = IEEE1284_MODE_COMPAT;
parport_negotiate(port, mode);
}
return mode;
}
static int lp_reset(int minor)
{
int retval;
lp_claim_parport_or_block(&lp_table[minor]);
w_ctr(minor, LP_PSELECP);
udelay(LP_DELAY);
w_ctr(minor, LP_PSELECP | LP_PINITP);
retval = r_str(minor);
lp_release_parport(&lp_table[minor]);
return retval;
}
static void lp_error(int minor)
{
DEFINE_WAIT(wait);
int polling;
if (LP_F(minor) & LP_ABORT)
return;
polling = lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE;
if (polling)
lp_release_parport(&lp_table[minor]);
prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE);
schedule_timeout(LP_TIMEOUT_POLLED);
finish_wait(&lp_table[minor].waitq, &wait);
if (polling)
lp_claim_parport_or_block(&lp_table[minor]);
else
parport_yield_blocking(lp_table[minor].dev);
}
static int lp_check_status(int minor)
{
int error = 0;
unsigned int last = lp_table[minor].last_error;
unsigned char status = r_str(minor);
if ((status & LP_PERRORP) && !(LP_F(minor) & LP_CAREFUL))
/* No error. */
last = 0;
else if ((status & LP_POUTPA)) {
if (last != LP_POUTPA) {
last = LP_POUTPA;
printk(KERN_INFO "lp%d out of paper\n", minor);
}
error = -ENOSPC;
} else if (!(status & LP_PSELECD)) {
if (last != LP_PSELECD) {
last = LP_PSELECD;
printk(KERN_INFO "lp%d off-line\n", minor);
}
error = -EIO;
} else if (!(status & LP_PERRORP)) {
if (last != LP_PERRORP) {
last = LP_PERRORP;
printk(KERN_INFO "lp%d on fire\n", minor);
}
error = -EIO;
} else {
last = 0; /* Come here if LP_CAREFUL is set and no
errors are reported. */
}
lp_table[minor].last_error = last;
if (last != 0)
lp_error(minor);
return error;
}
static int lp_wait_ready(int minor, int nonblock)
{
int error = 0;
/* If we're not in compatibility mode, we're ready now! */
if (lp_table[minor].current_mode != IEEE1284_MODE_COMPAT) {
return 0;
}
do {
error = lp_check_status(minor);
if (error && (nonblock || (LP_F(minor) & LP_ABORT)))
break;
if (signal_pending(current)) {
error = -EINTR;
break;
}
} while (error);
return error;
}
static ssize_t lp_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
unsigned int minor = iminor(file_inode(file));
struct parport *port = lp_table[minor].dev->port;
char *kbuf = lp_table[minor].lp_buffer;
ssize_t retv = 0;
ssize_t written;
size_t copy_size = count;
int nonblock = ((file->f_flags & O_NONBLOCK) ||
(LP_F(minor) & LP_ABORT));
#ifdef LP_STATS
if (time_after(jiffies, lp_table[minor].lastcall + LP_TIME(minor)))
lp_table[minor].runchars = 0;
lp_table[minor].lastcall = jiffies;
#endif
/* Need to copy the data from user-space. */
if (copy_size > LP_BUFFER_SIZE)
copy_size = LP_BUFFER_SIZE;
if (mutex_lock_interruptible(&lp_table[minor].port_mutex))
return -EINTR;
if (copy_from_user(kbuf, buf, copy_size)) {
retv = -EFAULT;
goto out_unlock;
}
/* Claim Parport or sleep until it becomes available
*/
lp_claim_parport_or_block(&lp_table[minor]);
/* Go to the proper mode. */
lp_table[minor].current_mode = lp_negotiate(port,
lp_table[minor].best_mode);
parport_set_timeout(lp_table[minor].dev,
(nonblock ? PARPORT_INACTIVITY_O_NONBLOCK
: lp_table[minor].timeout));
if ((retv = lp_wait_ready(minor, nonblock)) == 0)
do {
/* Write the data. */
written = parport_write(port, kbuf, copy_size);
if (written > 0) {
copy_size -= written;
count -= written;
buf += written;
retv += written;
}
if (signal_pending(current)) {
if (retv == 0)
retv = -EINTR;
break;
}
if (copy_size > 0) {
/* incomplete write -> check error ! */
int error;
parport_negotiate(lp_table[minor].dev->port,
IEEE1284_MODE_COMPAT);
lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
error = lp_wait_ready(minor, nonblock);
if (error) {
if (retv == 0)
retv = error;
break;
} else if (nonblock) {
if (retv == 0)
retv = -EAGAIN;
break;
}
parport_yield_blocking(lp_table[minor].dev);
lp_table[minor].current_mode
= lp_negotiate(port,
lp_table[minor].best_mode);
} else if (need_resched())
schedule();
if (count) {
copy_size = count;
if (copy_size > LP_BUFFER_SIZE)
copy_size = LP_BUFFER_SIZE;
if (copy_from_user(kbuf, buf, copy_size)) {
if (retv == 0)
retv = -EFAULT;
break;
}
}
} while (count > 0);
if (test_and_clear_bit(LP_PREEMPT_REQUEST,
&lp_table[minor].bits)) {
printk(KERN_INFO "lp%d releasing parport\n", minor);
parport_negotiate(lp_table[minor].dev->port,
IEEE1284_MODE_COMPAT);
lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
lp_release_parport(&lp_table[minor]);
}
out_unlock:
mutex_unlock(&lp_table[minor].port_mutex);
return retv;
}
#ifdef CONFIG_PARPORT_1284
/* Status readback conforming to ieee1284 */
static ssize_t lp_read(struct file *file, char __user *buf,
size_t count, loff_t *ppos)
{
DEFINE_WAIT(wait);
unsigned int minor=iminor(file_inode(file));
struct parport *port = lp_table[minor].dev->port;
ssize_t retval = 0;
char *kbuf = lp_table[minor].lp_buffer;
int nonblock = ((file->f_flags & O_NONBLOCK) ||
(LP_F(minor) & LP_ABORT));
if (count > LP_BUFFER_SIZE)
count = LP_BUFFER_SIZE;
if (mutex_lock_interruptible(&lp_table[minor].port_mutex))
return -EINTR;
lp_claim_parport_or_block(&lp_table[minor]);
parport_set_timeout(lp_table[minor].dev,
(nonblock ? PARPORT_INACTIVITY_O_NONBLOCK
: lp_table[minor].timeout));
parport_negotiate(lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
if (parport_negotiate(lp_table[minor].dev->port,
IEEE1284_MODE_NIBBLE)) {
retval = -EIO;
goto out;
}
while (retval == 0) {
retval = parport_read(port, kbuf, count);
if (retval > 0)
break;
if (nonblock) {
retval = -EAGAIN;
break;
}
/* Wait for data. */
if (lp_table[minor].dev->port->irq == PARPORT_IRQ_NONE) {
parport_negotiate(lp_table[minor].dev->port,
IEEE1284_MODE_COMPAT);
lp_error(minor);
if (parport_negotiate(lp_table[minor].dev->port,
IEEE1284_MODE_NIBBLE)) {
retval = -EIO;
goto out;
}
} else {
prepare_to_wait(&lp_table[minor].waitq, &wait, TASK_INTERRUPTIBLE);
schedule_timeout(LP_TIMEOUT_POLLED);
finish_wait(&lp_table[minor].waitq, &wait);
}
if (signal_pending(current)) {
retval = -ERESTARTSYS;
break;
}
cond_resched();
}
parport_negotiate(lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
out:
lp_release_parport(&lp_table[minor]);
if (retval > 0 && copy_to_user(buf, kbuf, retval))
retval = -EFAULT;
mutex_unlock(&lp_table[minor].port_mutex);
return retval;
}
#endif /* IEEE 1284 support */
static int lp_open(struct inode *inode, struct file *file)
{
unsigned int minor = iminor(inode);
int ret = 0;
mutex_lock(&lp_mutex);
if (minor >= LP_NO) {
ret = -ENXIO;
goto out;
}
if ((LP_F(minor) & LP_EXIST) == 0) {
ret = -ENXIO;
goto out;
}
if (test_and_set_bit(LP_BUSY_BIT_POS, &LP_F(minor))) {
ret = -EBUSY;
goto out;
}
/* If ABORTOPEN is set and the printer is offline or out of paper,
we may still want to open it to perform ioctl()s. Therefore we
have commandeered O_NONBLOCK, even though it is being used in
a non-standard manner. This is strictly a Linux hack, and
should most likely only ever be used by the tunelp application. */
if ((LP_F(minor) & LP_ABORTOPEN) && !(file->f_flags & O_NONBLOCK)) {
int status;
lp_claim_parport_or_block(&lp_table[minor]);
status = r_str(minor);
lp_release_parport(&lp_table[minor]);
if (status & LP_POUTPA) {
printk(KERN_INFO "lp%d out of paper\n", minor);
LP_F(minor) &= ~LP_BUSY;
ret = -ENOSPC;
goto out;
} else if (!(status & LP_PSELECD)) {
printk(KERN_INFO "lp%d off-line\n", minor);
LP_F(minor) &= ~LP_BUSY;
ret = -EIO;
goto out;
} else if (!(status & LP_PERRORP)) {
printk(KERN_ERR "lp%d printer error\n", minor);
LP_F(minor) &= ~LP_BUSY;
ret = -EIO;
goto out;
}
}
lp_table[minor].lp_buffer = kmalloc(LP_BUFFER_SIZE, GFP_KERNEL);
if (!lp_table[minor].lp_buffer) {
LP_F(minor) &= ~LP_BUSY;
ret = -ENOMEM;
goto out;
}
/* Determine if the peripheral supports ECP mode */
lp_claim_parport_or_block(&lp_table[minor]);
if ( (lp_table[minor].dev->port->modes & PARPORT_MODE_ECP) &&
!parport_negotiate(lp_table[minor].dev->port,
IEEE1284_MODE_ECP)) {
printk(KERN_INFO "lp%d: ECP mode\n", minor);
lp_table[minor].best_mode = IEEE1284_MODE_ECP;
} else {
lp_table[minor].best_mode = IEEE1284_MODE_COMPAT;
}
/* Leave peripheral in compatibility mode */
parport_negotiate(lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
lp_release_parport(&lp_table[minor]);
lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
out:
mutex_unlock(&lp_mutex);
return ret;
}
static int lp_release(struct inode *inode, struct file *file)
{
unsigned int minor = iminor(inode);
lp_claim_parport_or_block(&lp_table[minor]);
parport_negotiate(lp_table[minor].dev->port, IEEE1284_MODE_COMPAT);
lp_table[minor].current_mode = IEEE1284_MODE_COMPAT;
lp_release_parport(&lp_table[minor]);
kfree(lp_table[minor].lp_buffer);
lp_table[minor].lp_buffer = NULL;
LP_F(minor) &= ~LP_BUSY;
return 0;
}
static int lp_do_ioctl(unsigned int minor, unsigned int cmd,
unsigned long arg, void __user *argp)
{
int status;
int retval = 0;
#ifdef LP_DEBUG
printk(KERN_DEBUG "lp%d ioctl, cmd: 0x%x, arg: 0x%lx\n", minor, cmd, arg);
#endif
if (minor >= LP_NO)
return -ENODEV;
if ((LP_F(minor) & LP_EXIST) == 0)
return -ENODEV;
switch ( cmd ) {
case LPTIME:
if (arg > UINT_MAX / HZ)
return -EINVAL;
LP_TIME(minor) = arg * HZ/100;
break;
case LPCHAR:
LP_CHAR(minor) = arg;
break;
case LPABORT:
if (arg)
LP_F(minor) |= LP_ABORT;
else
LP_F(minor) &= ~LP_ABORT;
break;
case LPABORTOPEN:
if (arg)
LP_F(minor) |= LP_ABORTOPEN;
else
LP_F(minor) &= ~LP_ABORTOPEN;
break;
case LPCAREFUL:
if (arg)
LP_F(minor) |= LP_CAREFUL;
else
LP_F(minor) &= ~LP_CAREFUL;
break;
case LPWAIT:
LP_WAIT(minor) = arg;
break;
case LPSETIRQ:
return -EINVAL;
break;
case LPGETIRQ:
if (copy_to_user(argp, &LP_IRQ(minor),
sizeof(int)))
return -EFAULT;
break;
case LPGETSTATUS:
if (mutex_lock_interruptible(&lp_table[minor].port_mutex))
return -EINTR;
lp_claim_parport_or_block(&lp_table[minor]);
status = r_str(minor);
lp_release_parport(&lp_table[minor]);
mutex_unlock(&lp_table[minor].port_mutex);
if (copy_to_user(argp, &status, sizeof(int)))
return -EFAULT;
break;
case LPRESET:
lp_reset(minor);
break;
#ifdef LP_STATS
case LPGETSTATS:
if (copy_to_user(argp, &LP_STAT(minor),
sizeof(struct lp_stats)))
return -EFAULT;
if (capable(CAP_SYS_ADMIN))
memset(&LP_STAT(minor), 0,
sizeof(struct lp_stats));
break;
#endif
case LPGETFLAGS:
status = LP_F(minor);
if (copy_to_user(argp, &status, sizeof(int)))
return -EFAULT;
break;
default:
retval = -EINVAL;
}
return retval;
}
static int lp_set_timeout(unsigned int minor, s64 tv_sec, long tv_usec)
{
long to_jiffies;
/* Convert to jiffies, place in lp_table */
if (tv_sec < 0 || tv_usec < 0)
return -EINVAL;
/*
* we used to not check, so let's not make this fatal,
* but deal with user space passing a 32-bit tv_nsec in
* a 64-bit field, capping the timeout to 1 second
* worth of microseconds, and capping the total at
* MAX_JIFFY_OFFSET.
*/
if (tv_usec > 999999)
tv_usec = 999999;
if (tv_sec >= MAX_SEC_IN_JIFFIES - 1) {
to_jiffies = MAX_JIFFY_OFFSET;
} else {
to_jiffies = DIV_ROUND_UP(tv_usec, 1000000/HZ);
to_jiffies += tv_sec * (long) HZ;
}
if (to_jiffies <= 0) {
return -EINVAL;
}
lp_table[minor].timeout = to_jiffies;
return 0;
}
static int lp_set_timeout32(unsigned int minor, void __user *arg)
{
s32 karg[2];
if (copy_from_user(karg, arg, sizeof(karg)))
return -EFAULT;
return lp_set_timeout(minor, karg[0], karg[1]);
}
static int lp_set_timeout64(unsigned int minor, void __user *arg)
{
s64 karg[2];
if (copy_from_user(karg, arg, sizeof(karg)))
return -EFAULT;
/* sparc64 suseconds_t is 32-bit only */
if (IS_ENABLED(CONFIG_SPARC64) && !in_compat_syscall())
karg[1] >>= 32;
return lp_set_timeout(minor, karg[0], karg[1]);
}
static long lp_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
unsigned int minor;
int ret;
minor = iminor(file_inode(file));
mutex_lock(&lp_mutex);
switch (cmd) {
case LPSETTIMEOUT_OLD:
if (BITS_PER_LONG == 32) {
ret = lp_set_timeout32(minor, (void __user *)arg);
break;
}
/* fall through - for 64-bit */
case LPSETTIMEOUT_NEW:
ret = lp_set_timeout64(minor, (void __user *)arg);
break;
default:
ret = lp_do_ioctl(minor, cmd, arg, (void __user *)arg);
break;
}
mutex_unlock(&lp_mutex);
return ret;
}
#ifdef CONFIG_COMPAT
static long lp_compat_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
unsigned int minor;
int ret;
minor = iminor(file_inode(file));
mutex_lock(&lp_mutex);
switch (cmd) {
case LPSETTIMEOUT_OLD:
if (!COMPAT_USE_64BIT_TIME) {
ret = lp_set_timeout32(minor, (void __user *)arg);
break;
}
/* fall through - for x32 mode */
case LPSETTIMEOUT_NEW:
ret = lp_set_timeout64(minor, (void __user *)arg);
break;
#ifdef LP_STATS
case LPGETSTATS:
/* FIXME: add an implementation if you set LP_STATS */
ret = -EINVAL;
break;
#endif
default:
ret = lp_do_ioctl(minor, cmd, arg, compat_ptr(arg));
break;
}
mutex_unlock(&lp_mutex);
return ret;
}
#endif
static const struct file_operations lp_fops = {
.owner = THIS_MODULE,
.write = lp_write,
.unlocked_ioctl = lp_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = lp_compat_ioctl,
#endif
.open = lp_open,
.release = lp_release,
#ifdef CONFIG_PARPORT_1284
.read = lp_read,
#endif
.llseek = noop_llseek,
};
/* --- support for console on the line printer ----------------- */
#ifdef CONFIG_LP_CONSOLE
#define CONSOLE_LP 0
/* If the printer is out of paper, we can either lose the messages or
* stall until the printer is happy again. Define CONSOLE_LP_STRICT
* non-zero to get the latter behaviour. */
#define CONSOLE_LP_STRICT 1
/* The console must be locked when we get here. */
static void lp_console_write(struct console *co, const char *s,
unsigned count)
{
struct pardevice *dev = lp_table[CONSOLE_LP].dev;
struct parport *port = dev->port;
ssize_t written;
if (parport_claim(dev))
/* Nothing we can do. */
return;
parport_set_timeout(dev, 0);
/* Go to compatibility mode. */
parport_negotiate(port, IEEE1284_MODE_COMPAT);
do {
/* Write the data, converting LF->CRLF as we go. */
ssize_t canwrite = count;
char *lf = memchr(s, '\n', count);
if (lf)
canwrite = lf - s;
if (canwrite > 0) {
written = parport_write(port, s, canwrite);
if (written <= 0)
continue;
s += written;
count -= written;
canwrite -= written;
}
if (lf && canwrite <= 0) {
const char *crlf = "\r\n";
int i = 2;
/* Dodge the original '\n', and put '\r\n' instead. */
s++;
count--;
do {
written = parport_write(port, crlf, i);
if (written > 0)
i -= written, crlf += written;
} while (i > 0 && (CONSOLE_LP_STRICT || written > 0));
}
} while (count > 0 && (CONSOLE_LP_STRICT || written > 0));
parport_release(dev);
}
static struct console lpcons = {
.name = "lp",
.write = lp_console_write,
.flags = CON_PRINTBUFFER,
};
#endif /* console on line printer */
/* --- initialisation code ------------------------------------- */
static int parport_nr[LP_NO] = { [0 ... LP_NO-1] = LP_PARPORT_UNSPEC };
static char *parport[LP_NO];
static bool reset;
module_param_array(parport, charp, NULL, 0);
module_param(reset, bool, 0);
#ifndef MODULE
static int __init lp_setup(char *str)
{
static int parport_ptr;
int x;
if (get_option(&str, &x)) {
if (x == 0) {
/* disable driver on "lp=" or "lp=0" */
parport_nr[0] = LP_PARPORT_OFF;
} else {
printk(KERN_WARNING "warning: 'lp=0x%x' is deprecated, ignored\n", x);
return 0;
}
} else if (!strncmp(str, "parport", 7)) {
int n = simple_strtoul(str+7, NULL, 10);
if (parport_ptr < LP_NO)
parport_nr[parport_ptr++] = n;
else
printk(KERN_INFO "lp: too many ports, %s ignored.\n",
str);
} else if (!strcmp(str, "auto")) {
parport_nr[0] = LP_PARPORT_AUTO;
} else if (!strcmp(str, "none")) {
if (parport_ptr < LP_NO)
parport_nr[parport_ptr++] = LP_PARPORT_NONE;
else
printk(KERN_INFO "lp: too many ports, %s ignored.\n",
str);
} else if (!strcmp(str, "reset")) {
reset = true;
}
return 1;
}
#endif
static int lp_register(int nr, struct parport *port)
{
struct pardev_cb ppdev_cb;
memset(&ppdev_cb, 0, sizeof(ppdev_cb));
ppdev_cb.preempt = lp_preempt;
ppdev_cb.private = &lp_table[nr];
lp_table[nr].dev = parport_register_dev_model(port, "lp",
&ppdev_cb, nr);
if (lp_table[nr].dev == NULL)
return 1;
lp_table[nr].flags |= LP_EXIST;
if (reset)
lp_reset(nr);
device_create(lp_class, port->dev, MKDEV(LP_MAJOR, nr), NULL,
"lp%d", nr);
printk(KERN_INFO "lp%d: using %s (%s).\n", nr, port->name,
(port->irq == PARPORT_IRQ_NONE)?"polling":"interrupt-driven");
#ifdef CONFIG_LP_CONSOLE
if (!nr) {
if (port->modes & PARPORT_MODE_SAFEININT) {
register_console(&lpcons);
console_registered = port;
printk(KERN_INFO "lp%d: console ready\n", CONSOLE_LP);
} else
printk(KERN_ERR "lp%d: cannot run console on %s\n",
CONSOLE_LP, port->name);
}
#endif
port_num[nr] = port->number;
return 0;
}
static void lp_attach(struct parport *port)
{
unsigned int i;
switch (parport_nr[0]) {
case LP_PARPORT_UNSPEC:
case LP_PARPORT_AUTO:
if (parport_nr[0] == LP_PARPORT_AUTO &&
port->probe_info[0].class != PARPORT_CLASS_PRINTER)
return;
if (lp_count == LP_NO) {
printk(KERN_INFO "lp: ignoring parallel port (max. %d)\n",LP_NO);
return;
}
for (i = 0; i < LP_NO; i++)
if (port_num[i] == -1)
break;
if (!lp_register(i, port))
lp_count++;
break;
default:
for (i = 0; i < LP_NO; i++) {
if (port->number == parport_nr[i]) {
if (!lp_register(i, port))
lp_count++;
break;
}
}
break;
}
}
static void lp_detach(struct parport *port)
{
int n;
/* Write this some day. */
#ifdef CONFIG_LP_CONSOLE
if (console_registered == port) {
unregister_console(&lpcons);
console_registered = NULL;
}
#endif /* CONFIG_LP_CONSOLE */
for (n = 0; n < LP_NO; n++) {
if (port_num[n] == port->number) {
port_num[n] = -1;
lp_count--;
device_destroy(lp_class, MKDEV(LP_MAJOR, n));
parport_unregister_device(lp_table[n].dev);
}
}
}
static struct parport_driver lp_driver = {
.name = "lp",
.match_port = lp_attach,
.detach = lp_detach,
.devmodel = true,
};
static int __init lp_init(void)
{
int i, err = 0;
if (parport_nr[0] == LP_PARPORT_OFF)
return 0;
for (i = 0; i < LP_NO; i++) {
lp_table[i].dev = NULL;
lp_table[i].flags = 0;
lp_table[i].chars = LP_INIT_CHAR;
lp_table[i].time = LP_INIT_TIME;
lp_table[i].wait = LP_INIT_WAIT;
lp_table[i].lp_buffer = NULL;
#ifdef LP_STATS
lp_table[i].lastcall = 0;
lp_table[i].runchars = 0;
memset(&lp_table[i].stats, 0, sizeof(struct lp_stats));
#endif
lp_table[i].last_error = 0;
init_waitqueue_head(&lp_table[i].waitq);
init_waitqueue_head(&lp_table[i].dataq);
mutex_init(&lp_table[i].port_mutex);
lp_table[i].timeout = 10 * HZ;
port_num[i] = -1;
}
if (register_chrdev(LP_MAJOR, "lp", &lp_fops)) {
printk(KERN_ERR "lp: unable to get major %d\n", LP_MAJOR);
return -EIO;
}
lp_class = class_create(THIS_MODULE, "printer");
if (IS_ERR(lp_class)) {
err = PTR_ERR(lp_class);
goto out_reg;
}
if (parport_register_driver(&lp_driver)) {
printk(KERN_ERR "lp: unable to register with parport\n");
err = -EIO;
goto out_class;
}
if (!lp_count) {
printk(KERN_INFO "lp: driver loaded but no devices found\n");
#ifndef CONFIG_PARPORT_1284
if (parport_nr[0] == LP_PARPORT_AUTO)
printk(KERN_INFO "lp: (is IEEE 1284 support enabled?)\n");
#endif
}
return 0;
out_class:
class_destroy(lp_class);
out_reg:
unregister_chrdev(LP_MAJOR, "lp");
return err;
}
static int __init lp_init_module(void)
{
if (parport[0]) {
/* The user gave some parameters. Let's see what they were. */
if (!strncmp(parport[0], "auto", 4))
parport_nr[0] = LP_PARPORT_AUTO;
else {
int n;
for (n = 0; n < LP_NO && parport[n]; n++) {
if (!strncmp(parport[n], "none", 4))
parport_nr[n] = LP_PARPORT_NONE;
else {
char *ep;
unsigned long r = simple_strtoul(parport[n], &ep, 0);
if (ep != parport[n])
parport_nr[n] = r;
else {
printk(KERN_ERR "lp: bad port specifier `%s'\n", parport[n]);
return -ENODEV;
}
}
}
}
}
return lp_init();
}
static void lp_cleanup_module(void)
{
parport_unregister_driver(&lp_driver);
#ifdef CONFIG_LP_CONSOLE
unregister_console(&lpcons);
#endif
unregister_chrdev(LP_MAJOR, "lp");
class_destroy(lp_class);
}
__setup("lp=", lp_setup);
module_init(lp_init_module);
module_exit(lp_cleanup_module);
MODULE_ALIAS_CHARDEV_MAJOR(LP_MAJOR);
MODULE_LICENSE("GPL");