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* 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
*/
#include <linux/module.h>
#include <linux/config.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/sched.h>
#include <linux/malloc.h>
#include <linux/ioport.h>
#include <linux/fcntl.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <linux/parport.h>
#include <linux/lp.h>
/* the BIOS manuals say there can be up to 4 lpt devices
* but I have not seen a board where the 4th address is listed
* if you have different hardware change the table below
* please let me know if you have different equipment
* if you have more than 3 printers, remember to increase LP_NO
*/
struct lp_struct lp_table[] =
{
{NULL, 0, LP_INIT_CHAR, LP_INIT_TIME, LP_INIT_WAIT, NULL, NULL, 0, 0, 0,
{0}},
{NULL, 0, LP_INIT_CHAR, LP_INIT_TIME, LP_INIT_WAIT, NULL, NULL, 0, 0, 0,
{0}},
{NULL, 0, LP_INIT_CHAR, LP_INIT_TIME, LP_INIT_WAIT, NULL, NULL, 0, 0, 0,
{0}}
};
#define LP_NO 3
/* Device name */
static char *dev_name = "lp";
/* Test if printer is ready (and optionally has no error conditions) */
#define LP_READY(minor, status) \
((LP_F(minor) & LP_CAREFUL) ? _LP_CAREFUL_READY(status) : (status & LP_PBUSY))
#define LP_CAREFUL_READY(minor, status) \
((LP_F(minor) & LP_CAREFUL) ? _LP_CAREFUL_READY(status) : 1)
#define _LP_CAREFUL_READY(status) \
(status & (LP_PBUSY|LP_POUTPA|LP_PSELECD|LP_PERRORP)) == \
(LP_PBUSY|LP_PSELECD|LP_PERRORP)
#undef LP_DEBUG
#undef LP_READ_DEBUG
static int lp_reset(int minor)
{
w_ctr(minor, LP_PSELECP);
udelay(LP_DELAY);
w_ctr(minor, LP_PSELECP | LP_PINITP);
return r_str(minor);
}
static inline int lp_char_polled(char lpchar, int minor)
{
int status, wait = 0;
unsigned long count = 0;
struct lp_stats *stats;
do {
status = r_str(minor);
count++;
if (need_resched)
schedule();
} while (!LP_READY(minor, status) && count < LP_CHAR(minor));
if (count == LP_CHAR(minor)) {
return 0;
/* we timed out, and the character was /not/ printed */
}
w_dtr(minor, lpchar);
stats = &LP_STAT(minor);
stats->chars++;
/* must wait before taking strobe high, and after taking strobe
low, according spec. Some printers need it, others don't. */
while (wait != LP_WAIT(minor))
wait++;
/* control port takes strobe high */
w_ctr(minor, LP_PSELECP | LP_PINITP | LP_PSTROBE);
while (wait)
wait--;
/* take strobe low */
w_ctr(minor, LP_PSELECP | LP_PINITP);
/* update waittime statistics */
if (count > stats->maxwait) {
#ifdef LP_DEBUG
printk(KERN_DEBUG "lp%d success after %d counts.\n", minor, count);
#endif
stats->maxwait = count;
}
count *= 256;
wait = (count > stats->meanwait) ? count - stats->meanwait :
stats->meanwait - count;
stats->meanwait = (255 * stats->meanwait + count + 128) / 256;
stats->mdev = ((127 * stats->mdev) + wait + 64) / 128;
return 1;
}
static inline int lp_char_interrupt(char lpchar, int minor)
{
int wait;
unsigned long count = 0;
unsigned char status;
struct lp_stats *stats;
do {
if(need_resched)
schedule();
if ((status = r_str(minor)) & LP_PBUSY) {
if (!LP_CAREFUL_READY(minor, status))
return 0;
w_dtr(minor, lpchar);
stats = &LP_STAT(minor);
stats->chars++;
/* must wait before taking strobe high, and after taking strobe
low, according spec. Some printers need it, others don't. */
wait = 0;
while (wait != LP_WAIT(minor))
wait++;
/* control port takes strobe high */
w_ctr(minor, LP_PSELECP | LP_PINITP | LP_PSTROBE);
while (wait)
wait--;
/* take strobe low */
w_ctr(minor, LP_PSELECP | LP_PINITP);
/* update waittime statistics */
if (count) {
if (count > stats->maxwait)
stats->maxwait = count;
count *= 256;
wait = (count > stats->meanwait) ? count - stats->meanwait :
stats->meanwait - count;
stats->meanwait = (255 * stats->meanwait + count + 128) / 256;
stats->mdev = ((127 * stats->mdev) + wait + 64) / 128;
}
return 1;
}
} while (count++ < LP_CHAR(minor));
return 0;
}
static void lp_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
struct parport *pb = (struct parport *) dev_id;
struct ppd *pd = pb->cad;
struct lp_struct *lp_dev = (struct lp_struct *) pd->private;
if (lp_dev->lp_wait_q)
wake_up(&lp_dev->lp_wait_q);
}
static inline int lp_write_interrupt(unsigned int minor, const char *buf, int count)
{
unsigned long copy_size;
unsigned long total_bytes_written = 0;
unsigned long bytes_written;
struct lp_struct *lp = &lp_table[minor];
unsigned char status;
if (minor >= LP_NO)
return -ENXIO;
if (lp_table[minor].dev == NULL)
return -ENXIO;
do {
bytes_written = 0;
copy_size = (count <= LP_BUFFER_SIZE ? count : LP_BUFFER_SIZE);
copy_from_user(lp->lp_buffer, buf, copy_size);
while (copy_size) {
if (lp_char_interrupt(lp->lp_buffer[bytes_written], minor)) {
--copy_size;
++bytes_written;
lp_table[minor].runchars++;
} else {
int rc = total_bytes_written + bytes_written;
if (lp_table[minor].runchars > LP_STAT(minor).maxrun)
LP_STAT(minor).maxrun = lp_table[minor].runchars;
status = r_str(minor);
if ((status & LP_POUTPA)) {
printk(KERN_INFO "lp%d out of paper\n", minor);
if (LP_F(minor) & LP_ABORT)
return rc ? rc : -ENOSPC;
} else if (!(status & LP_PSELECD)) {
printk(KERN_INFO "lp%d off-line\n", minor);
if (LP_F(minor) & LP_ABORT)
return rc ? rc : -EIO;
} else if (!(status & LP_PERRORP)) {
printk(KERN_ERR "lp%d printer error\n", minor);
if (LP_F(minor) & LP_ABORT)
return rc ? rc : -EIO;
}
LP_STAT(minor).sleeps++;
cli();
w_ctr(minor, LP_PSELECP | LP_PINITP | LP_PINTEN);
status = r_str(minor);
if ((!(status & LP_PACK) || (status & LP_PBUSY))
&& LP_CAREFUL_READY(minor, status)) {
w_ctr(minor, LP_PSELECP | LP_PINITP);
sti();
continue;
}
lp_table[minor].runchars = 0;
current->timeout = jiffies + LP_TIMEOUT_INTERRUPT;
interruptible_sleep_on(&lp->lp_wait_q);
w_ctr(minor, LP_PSELECP | LP_PINITP);
sti();
if (current->signal & ~current->blocked) {
if (total_bytes_written + bytes_written)
return total_bytes_written + bytes_written;
else
return -EINTR;
}
}
}
total_bytes_written += bytes_written;
buf += bytes_written;
count -= bytes_written;
} while (count > 0);
return total_bytes_written;
}
static inline int lp_write_polled(unsigned int minor, const char *buf, int count)
{
int retval, status;
char c;
const char *temp;
temp = buf;
while (count > 0) {
get_user(c, temp);
retval = lp_char_polled(c, minor);
/* only update counting vars if character was printed */
if (retval) {
count--; temp++;
lp_table[minor].runchars++;
} else { /* if printer timed out */
if (lp_table[minor].runchars > LP_STAT(minor).maxrun)
LP_STAT(minor).maxrun = lp_table[minor].runchars;
status = r_str(minor);
if (status & LP_POUTPA) {
printk(KERN_INFO "lp%d out of paper\n", minor);
if(LP_F(minor) & LP_ABORT)
return temp-buf?temp-buf:-ENOSPC;
current->state = TASK_INTERRUPTIBLE;
current->timeout = jiffies + LP_TIMEOUT_POLLED;
schedule();
} else
if (!(status & LP_PSELECD)) {
printk(KERN_INFO "lp%d off-line\n", minor);
if(LP_F(minor) & LP_ABORT)
return temp-buf?temp-buf:-EIO;
current->state = TASK_INTERRUPTIBLE;
current->timeout = jiffies + LP_TIMEOUT_POLLED;
schedule();
} else
/* not offline or out of paper. on fire? */
if (!(status & LP_PERRORP)) {
printk(KERN_ERR "lp%d on fire\n", minor);
if(LP_F(minor) & LP_ABORT)
return temp-buf?temp-buf:-EIO;
current->state = TASK_INTERRUPTIBLE;
current->timeout = jiffies + LP_TIMEOUT_POLLED;
schedule();
}
/* check for signals before going to sleep */
if (current->signal & ~current->blocked) {
if (temp != buf)
return temp-buf;
else
return -EINTR;
}
LP_STAT(minor).sleeps++;
#ifdef LP_DEBUG
printk(KERN_DEBUG "lp%d sleeping at %d characters for %d jiffies\n",
minor,lp_table[minor].runchars, LP_TIME(minor));
#endif
lp_table[minor].runchars=0;
current->state = TASK_INTERRUPTIBLE;
current->timeout = jiffies + LP_TIME(minor);
schedule();
}
}
return temp-buf;
}
static long lp_write(struct inode * inode, struct file * file,
const char * buf, unsigned long count)
{
unsigned int minor = MINOR(inode->i_rdev);
int retv;
if (jiffies-lp_table[minor].lastcall > LP_TIME(minor))
lp_table[minor].runchars = 0;
lp_table[minor].lastcall = jiffies;
/* Claim Parport or sleep until it becomes available
* (see lp_wakeup() for details)
*/
if (parport_claim(lp_table[minor].dev)) {
sleep_on(&lp_table[minor].lp_wait_q);
lp_table[minor].lp_wait_q = NULL;
}
if (LP_IRQ(minor) > 0)
retv = lp_write_interrupt(minor, buf, count);
else
retv = lp_write_polled(minor, buf, count);
parport_release(lp_table[minor].dev);
return retv;
}
static long long lp_lseek(struct inode * inode, struct file * file,
long long offset, int origin)
{
return -ESPIPE;
}
#ifdef CONFIG_PRINTER_READBACK
static int lp_read_nibble(int minor)
{
unsigned char i;
i=r_str(minor)>>3;
i&=~8;
if ( ( i & 0x10) == 0) i|=8;
return(i & 0x0f);
}
static void lp_select_in_high(int minor) {
w_ctr(minor, (r_ctr(minor) | 8));
}
/* Status readback confirming to ieee1284 */
static long lp_read(struct inode * inode, struct file * file,
char * buf, unsigned long count)
{
unsigned char z=0, Byte=0, status;
char *temp;
int retval;
unsigned int counter=0;
unsigned int i;
unsigned int minor=MINOR(inode->i_rdev);
/* Claim Parport or sleep until it becomes available
* (see lp_wakeup() for details)
*/
if (parport_claim(lp_table[minor].dev)) {
sleep_on(&lp_table[minor].lp_wait_q);
lp_table[minor].lp_wait_q = NULL;
}
temp=buf;
#ifdef LP_READ_DEBUG
printk(KERN_INFO "lp%d: read mode\n", minor);
#endif
retval = verify_area(VERIFY_WRITE, buf, count);
if (retval)
return retval;
if (parport_ieee1284_nibble_mode_ok(lp_table[minor].dev->port, 0)==0) {
#ifdef LP_READ_DEBUG
printk(KERN_INFO "lp%d: rejected IEEE1284 negotiation.\n",
minor);
#endif
lp_select_in_high(minor);
parport_release(lp_table[minor].dev);
return temp-buf; /* End of file */
}
for (i=0; i<=(count*2); i++) {
w_ctr(minor, r_ctr(minor) | 2); /* AutoFeed high */
do {
status=(r_str(minor) & 0x40);
udelay(50);
counter++;
if (need_resched)
schedule();
} while ( (status == 0x40) && (counter < 20) );
if ( counter == 20 ) { /* Timeout */
#ifdef LP_READ_DEBUG
printk(KERN_DEBUG "lp_read: (Autofeed high) timeout\n");
#endif
w_ctr(minor, r_ctr(minor) & ~2);
lp_select_in_high(minor);
parport_release(lp_table[minor].dev);
return temp-buf; /* end the read at timeout */
}
counter=0;
z=lp_read_nibble(minor);
w_ctr(minor, r_ctr(minor) & ~2); /* AutoFeed low */
do {
status=(r_str(minor) & 0x40);
udelay(20);
counter++;
if (need_resched)
schedule();
} while ( (status == 0) && (counter < 20) );
if (counter == 20) { /* Timeout */
#ifdef LP_READ_DEBUG
printk(KERN_DEBUG "lp_read: (Autofeed low) timeout\n");
#endif
if (current->signal & ~current->blocked) {
lp_select_in_high(minor);
parport_release(lp_table[minor].dev);
if (temp !=buf)
return temp-buf;
else
return -EINTR;
}
current->state=TASK_INTERRUPTIBLE;
current->timeout=jiffies + LP_TIME(minor);
schedule();
}
counter=0;
if (( i & 1) != 0) {
Byte= (Byte | z<<4);
put_user(Byte, temp);
temp++;
} else Byte=z;
}
lp_select_in_high(minor);
parport_release(lp_table[minor].dev);
return temp-buf;
}
#endif
static int lp_open(struct inode * inode, struct file * file)
{
unsigned int minor = MINOR(inode->i_rdev);
if (minor >= LP_NO)
return -ENXIO;
if ((LP_F(minor) & LP_EXIST) == 0)
return -ENXIO;
if (LP_F(minor) & LP_BUSY)
return -EBUSY;
MOD_INC_USE_COUNT;
/* 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 = r_str(minor);
if (status & LP_POUTPA) {
printk(KERN_INFO "lp%d out of paper\n", minor);
MOD_DEC_USE_COUNT;
return -ENOSPC;
} else if (!(status & LP_PSELECD)) {
printk(KERN_INFO "lp%d off-line\n", minor);
MOD_DEC_USE_COUNT;
return -EIO;
} else if (!(status & LP_PERRORP)) {
printk(KERN_ERR "lp%d printer error\n", minor);
MOD_DEC_USE_COUNT;
return -EIO;
}
}
if (LP_IRQ(minor) > 0) {
lp_table[minor].lp_buffer = (char *) kmalloc(LP_BUFFER_SIZE, GFP_KERNEL);
if (!lp_table[minor].lp_buffer) {
MOD_DEC_USE_COUNT;
return -ENOMEM;
}
}
LP_F(minor) |= LP_BUSY;
return 0;
}
static int lp_release(struct inode * inode, struct file * file)
{
unsigned int minor = MINOR(inode->i_rdev);
if (LP_IRQ(minor) > 0) {
kfree_s(lp_table[minor].lp_buffer, LP_BUFFER_SIZE);
lp_table[minor].lp_buffer = NULL;
}
LP_F(minor) &= ~LP_BUSY;
MOD_DEC_USE_COUNT;
return 0;
}
static int lp_ioctl(struct inode *inode, struct file *file,
unsigned int cmd, unsigned long arg)
{
unsigned int minor = MINOR(inode->i_rdev);
int retval = 0;
#ifdef LP_DEBUG
printk(KERN_DEBUG "lp%d ioctl, cmd: 0x%x, arg: 0x%x\n", minor, cmd, arg);
#endif
if (minor >= LP_NO)
return -ENODEV;
if ((LP_F(minor) & LP_EXIST) == 0)
return -ENODEV;
switch ( cmd ) {
case LPTIME:
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:
retval = verify_area(VERIFY_WRITE, (void *) arg,
sizeof(int));
if (retval)
return retval;
copy_to_user((int *) arg, &LP_IRQ(minor), sizeof(int));
break;
case LPGETSTATUS:
retval = verify_area(VERIFY_WRITE, (void *) arg,
sizeof(int));
if (retval)
return retval;
else {
int status = r_str(minor);
copy_to_user((int *) arg, &status, sizeof(int));
}
break;
case LPRESET:
lp_reset(minor);
break;
case LPGETSTATS:
retval = verify_area(VERIFY_WRITE, (void *) arg,
sizeof(struct lp_stats));
if (retval)
return retval;
else {
copy_to_user((int *) arg, &LP_STAT(minor), sizeof(struct lp_stats));
if (suser())
memset(&LP_STAT(minor), 0, sizeof(struct lp_stats));
}
break;
case LPGETFLAGS:
retval = verify_area(VERIFY_WRITE, (void *) arg,
sizeof(int));
if (retval)
return retval;
else {
int status = LP_F(minor);
copy_to_user((int *) arg, &status, sizeof(int));
}
break;
default:
retval = -EINVAL;
}
return retval;
}
static struct file_operations lp_fops = {
lp_lseek,
#ifdef CONFIG_PRINTER_READBACK
lp_read,
#else
NULL,
#endif
lp_write,
NULL, /* lp_readdir */
NULL, /* lp_poll */
lp_ioctl,
NULL, /* lp_mmap */
lp_open,
lp_release
};
static int parport[LP_NO] = { -1, };
#ifdef MODULE
#define lp_init init_module
MODULE_PARM(parport, "1-" __MODULE_STRING(LP_NO) "i");
#else
static int parport_ptr = 0;
__initfunc(void lp_setup(char *str, int *ints))
{
/* Ugh. */
if (!strncmp(str, "parport", 7)) {
int n = simple_strtoul(str+7, NULL, 10);
if (parport_ptr < LP_NO)
parport[parport_ptr++] = n;
else
printk(KERN_INFO "lp: too many ports, %s ignored.\n",
str);
} else if (!strcmp(str, "auto")) {
parport[0] = -3;
} else {
if (ints[0] == 0 || ints[1] == 0) {
/* disable driver on "parport=" or "parport=0" */
parport[0] = -2;
} else {
printk(KERN_WARNING "warning: 'lp=0x%x' is deprecated, ignored\n", ints[1]);
}
}
}
#endif
int lp_wakeup(void *ref)
{
struct lp_struct *lp_dev = (struct lp_struct *) ref;
if (!lp_dev->lp_wait_q)
return 1; /* Wake up whom? */
/* Claim the Parport */
if (parport_claim(lp_dev->dev))
return 1; /* Shouldn't happen */
wake_up(&lp_dev->lp_wait_q);
return 0;
}
static int inline lp_searchfor(int list[], int a)
{
int i;
for (i = 0; i < LP_NO && list[i] != -1; i++) {
if (list[i] == a) return 1;
}
return 0;
}
__initfunc(int lp_init(void))
{
int count = 0;
struct parport *pb;
if (register_chrdev(LP_MAJOR, "lp", &lp_fops)) {
printk("lp: unable to get major %d\n", LP_MAJOR);
return -EIO;
}
if (parport[0] == -2) return 0;
pb = parport_enumerate();
while (pb) {
/* We only understand PC-style ports. */
if (pb->modes & PARPORT_MODE_SPP) {
if (parport[0] == -1 || lp_searchfor(parport, count) ||
(parport[0] == -3 &&
pb->probe_info.class == PARPORT_CLASS_PRINTER)) {
lp_table[count].dev =
parport_register_device(pb, dev_name, NULL,
lp_wakeup,
lp_interrupt, PARPORT_DEV_TRAN,
(void *) &lp_table[count]);
lp_table[count].flags |= LP_EXIST;
printk(KERN_INFO "lp%d: using %s at 0x%x, ",
count, pb->name, pb->base);
if (pb->irq == PARPORT_IRQ_NONE)
printk("polling.\n");
else
printk("irq %d.\n", pb->irq);
}
if (++count == LP_NO)
break;
}
pb = pb->next;
}
/* Successful specified devices increase count
* Unsuccessful specified devices increase failed
*/
if (count)
return 0;
printk(KERN_INFO "lp: driver loaded but no devices found\n");
return 1;
}
#ifdef MODULE
void cleanup_module(void)
{
int offset;
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);
}
}
#endif
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