1063 lines
26 KiB
C
1063 lines
26 KiB
C
/*
|
|
* 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.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 <asm/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 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, struct timeval *par_timeout)
|
|
{
|
|
long to_jiffies;
|
|
|
|
/* Convert to jiffies, place in lp_table */
|
|
if ((par_timeout->tv_sec < 0) ||
|
|
(par_timeout->tv_usec < 0)) {
|
|
return -EINVAL;
|
|
}
|
|
to_jiffies = DIV_ROUND_UP(par_timeout->tv_usec, 1000000/HZ);
|
|
to_jiffies += par_timeout->tv_sec * (long) HZ;
|
|
if (to_jiffies <= 0) {
|
|
return -EINVAL;
|
|
}
|
|
lp_table[minor].timeout = to_jiffies;
|
|
return 0;
|
|
}
|
|
|
|
static long lp_ioctl(struct file *file, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
unsigned int minor;
|
|
struct timeval par_timeout;
|
|
int ret;
|
|
|
|
minor = iminor(file_inode(file));
|
|
mutex_lock(&lp_mutex);
|
|
switch (cmd) {
|
|
case LPSETTIMEOUT:
|
|
if (copy_from_user(&par_timeout, (void __user *)arg,
|
|
sizeof (struct timeval))) {
|
|
ret = -EFAULT;
|
|
break;
|
|
}
|
|
ret = lp_set_timeout(minor, &par_timeout);
|
|
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;
|
|
struct timeval par_timeout;
|
|
int ret;
|
|
|
|
minor = iminor(file_inode(file));
|
|
mutex_lock(&lp_mutex);
|
|
switch (cmd) {
|
|
case LPSETTIMEOUT:
|
|
if (compat_get_timeval(&par_timeout, compat_ptr(arg))) {
|
|
ret = -EFAULT;
|
|
break;
|
|
}
|
|
ret = lp_set_timeout(minor, &par_timeout);
|
|
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")) {
|
|
parport_nr[parport_ptr++] = LP_PARPORT_NONE;
|
|
} else if (!strcmp(str, "reset")) {
|
|
reset = 1;
|
|
}
|
|
return 1;
|
|
}
|
|
#endif
|
|
|
|
static int lp_register(int nr, struct parport *port)
|
|
{
|
|
lp_table[nr].dev = parport_register_device(port, "lp",
|
|
lp_preempt, NULL, NULL, 0,
|
|
(void *) &lp_table[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
|
|
|
|
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;
|
|
}
|
|
if (!lp_register(lp_count, 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)
|
|
{
|
|
/* Write this some day. */
|
|
#ifdef CONFIG_LP_CONSOLE
|
|
if (console_registered == port) {
|
|
unregister_console(&lpcons);
|
|
console_registered = NULL;
|
|
}
|
|
#endif /* CONFIG_LP_CONSOLE */
|
|
}
|
|
|
|
static struct parport_driver lp_driver = {
|
|
.name = "lp",
|
|
.attach = lp_attach,
|
|
.detach = lp_detach,
|
|
};
|
|
|
|
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;
|
|
}
|
|
|
|
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)
|
|
{
|
|
unsigned int offset;
|
|
|
|
parport_unregister_driver (&lp_driver);
|
|
|
|
#ifdef CONFIG_LP_CONSOLE
|
|
unregister_console (&lpcons);
|
|
#endif
|
|
|
|
unregister_chrdev(LP_MAJOR, "lp");
|
|
for (offset = 0; offset < LP_NO; offset++) {
|
|
if (lp_table[offset].dev == NULL)
|
|
continue;
|
|
parport_unregister_device(lp_table[offset].dev);
|
|
device_destroy(lp_class, MKDEV(LP_MAJOR, offset));
|
|
}
|
|
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");
|