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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)
*/
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/sched.h>
#include <linux/lp.h>
#include <linux/malloc.h>
#include <linux/ioport.h>
#include <asm/io.h>
#include <asm/segment.h>
#include <asm/system.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[] = {
{ 0x3bc, 0, 0, LP_INIT_CHAR, LP_INIT_TIME, LP_INIT_WAIT, NULL, NULL, },
{ 0x378, 0, 0, LP_INIT_CHAR, LP_INIT_TIME, LP_INIT_WAIT, NULL, NULL, },
{ 0x278, 0, 0, LP_INIT_CHAR, LP_INIT_TIME, LP_INIT_WAIT, NULL, NULL, },
};
#define LP_NO 3
#ifdef MODULE
#include <linux/module.h>
#include <linux/version.h>
#endif
/*
* All my debugging code assumes that you debug with only one printer at
* a time. RWWH
*/
#undef LP_DEBUG
static int lp_reset(int minor)
{
int testvalue;
unsigned char command;
command = LP_PSELECP | LP_PINITP;
/* reset value */
outb_p(0, LP_C(minor));
for (testvalue = 0 ; testvalue < LP_DELAY ; testvalue++)
;
outb_p(command, LP_C(minor));
return LP_S(minor);
}
#ifdef LP_DEBUG
static int lp_max_count = 1;
#endif
static int lp_char_polled(char lpchar, int minor)
{
int status = 0, wait = 0;
unsigned long count = 0;
do {
status = LP_S(minor);
count ++;
if(need_resched)
schedule();
} while(!(status & LP_PBUSY) && count < LP_CHAR(minor));
if (count == LP_CHAR(minor)) {
return 0;
/* we timed out, and the character was /not/ printed */
}
#ifdef LP_DEBUG
if (count > lp_max_count) {
printk("lp success after %d counts.\n",count);
lp_max_count=count;
}
#endif
outb_p(lpchar, LP_B(minor));
/* 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 */
outb_p(( LP_PSELECP | LP_PINITP | LP_PSTROBE ), ( LP_C( minor )));
while(wait) wait--;
/* take strobe low */
outb_p(( LP_PSELECP | LP_PINITP ), ( LP_C( minor )));
return 1;
}
static int lp_char_interrupt(char lpchar, int minor)
{
int wait = 0;
unsigned char status;
if (!((status = LP_S(minor)) & LP_PACK) || (status & LP_PBUSY)
|| !((status = LP_S(minor)) & LP_PACK) || (status & LP_PBUSY)
|| !((status = LP_S(minor)) & LP_PACK) || (status & LP_PBUSY)) {
outb_p(lpchar, LP_B(minor));
/* 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 */
outb_p(( LP_PSELECP | LP_PINITP | LP_PSTROBE ), ( LP_C( minor )));
while(wait) wait--;
/* take strobe low */
outb_p(( LP_PSELECP | LP_PINITP ), ( LP_C( minor )));
return 1;
}
return 0;
}
#ifdef LP_DEBUG
unsigned int lp_total_chars = 0;
unsigned int lp_last_call = 0;
#endif
static void lp_interrupt(int irq)
{
struct lp_struct *lp = &lp_table[0];
struct lp_struct *lp_end = &lp_table[LP_NO];
while (irq != lp->irq) {
if (++lp >= lp_end)
return;
}
wake_up(&lp->lp_wait_q);
}
static int lp_write_interrupt(struct inode * inode, struct file * file, char * buf, int count)
{
unsigned int minor = MINOR(inode->i_rdev);
unsigned long copy_size;
unsigned long total_bytes_written = 0;
unsigned long bytes_written;
struct lp_struct *lp = &lp_table[minor];
unsigned char status;
do {
bytes_written = 0;
copy_size = (count <= LP_BUFFER_SIZE ? count : LP_BUFFER_SIZE);
memcpy_fromfs(lp->lp_buffer, buf, copy_size);
while (copy_size) {
if (lp_char_interrupt(lp->lp_buffer[bytes_written], minor)) {
--copy_size;
++bytes_written;
} else {
if (!((status = LP_S(minor)) & LP_PERRORP)) {
int rc = total_bytes_written + bytes_written;
if ((status & LP_POUTPA)) {
printk("lp%d out of paper\n", minor);
if (!rc)
rc = -ENOSPC;
} else if (!(status & LP_PSELECD)) {
printk("lp%d off-line\n", minor);
if (!rc)
rc = -EIO;
} else {
printk("lp%d printer error\n", minor);
if (!rc)
rc = -EIO;
}
if(LP_F(minor) & LP_ABORT)
return rc;
}
cli();
outb_p((LP_PSELECP|LP_PINITP|LP_PINTEN), (LP_C(minor)));
status = LP_S(minor);
if (!(status & LP_PACK) || (status & LP_PBUSY)) {
outb_p((LP_PSELECP|LP_PINITP), (LP_C(minor)));
sti();
continue;
}
current->timeout = jiffies + LP_TIMEOUT_INTERRUPT;
interruptible_sleep_on(&lp->lp_wait_q);
outb_p((LP_PSELECP|LP_PINITP), (LP_C(minor)));
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 int lp_write_polled(struct inode * inode, struct file * file,
char * buf, int count)
{
int retval;
unsigned int minor = MINOR(inode->i_rdev);
char c, *temp = buf;
#ifdef LP_DEBUG
if (jiffies-lp_last_call > LP_TIME(minor)) {
lp_total_chars = 0;
lp_max_count = 1;
}
lp_last_call = jiffies;
#endif
temp = buf;
while (count > 0) {
c = get_fs_byte(temp);
retval = lp_char_polled(c, minor);
/* only update counting vars if character was printed */
if (retval) { count--; temp++;
#ifdef LP_DEBUG
lp_total_chars++;
#endif
}
if (!retval) { /* if printer timed out */
int status = LP_S(minor);
if (status & LP_POUTPA) {
printk("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("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("lp%d reported invalid error status (on fire, eh?)\n", minor);
if(LP_F(minor) & LP_ABORT)
return temp-buf?temp-buf:-EFAULT;
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;
}
#ifdef LP_DEBUG
printk("lp sleeping at %d characters for %d jiffies\n",
lp_total_chars, LP_TIME(minor));
lp_total_chars=0;
#endif
current->state = TASK_INTERRUPTIBLE;
current->timeout = jiffies + LP_TIME(minor);
schedule();
}
}
return temp-buf;
}
static int lp_write(struct inode * inode, struct file * file, char * buf, int count)
{
if (LP_IRQ(MINOR(inode->i_rdev)))
return lp_write_interrupt(inode, file, buf, count);
else
return lp_write_polled(inode, file, buf, count);
}
static int lp_lseek(struct inode * inode, struct file * file,
off_t offset, int origin)
{
return -ESPIPE;
}
static int lp_open(struct inode * inode, struct file * file)
{
unsigned int minor = MINOR(inode->i_rdev);
int ret;
unsigned int irq;
if (minor >= LP_NO)
return -ENODEV;
if ((LP_F(minor) & LP_EXIST) == 0)
return -ENODEV;
if (LP_F(minor) & LP_BUSY)
return -EBUSY;
if ((irq = LP_IRQ(minor))) {
lp_table[minor].lp_buffer = (char *) kmalloc(LP_BUFFER_SIZE, GFP_KERNEL);
if (!lp_table[minor].lp_buffer)
return -ENOMEM;
ret = request_irq(irq, lp_interrupt, SA_INTERRUPT, "printer");
if (ret) {
kfree_s(lp_table[minor].lp_buffer, LP_BUFFER_SIZE);
lp_table[minor].lp_buffer = NULL;
printk("lp%d unable to use interrupt %d, error %d\n", minor, irq, ret);
return ret;
}
}
LP_F(minor) |= LP_BUSY;
#ifdef MODULE
MOD_INC_USE_COUNT;
#endif
return 0;
}
static void lp_release(struct inode * inode, struct file * file)
{
unsigned int minor = MINOR(inode->i_rdev);
unsigned int irq;
if ((irq = LP_IRQ(minor))) {
free_irq(irq);
kfree_s(lp_table[minor].lp_buffer, LP_BUFFER_SIZE);
lp_table[minor].lp_buffer = NULL;
}
LP_F(minor) &= ~LP_BUSY;
#ifdef MODULE
MOD_DEC_USE_COUNT;
#endif
}
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("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;
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 LPWAIT:
LP_WAIT(minor) = arg;
break;
case LPSETIRQ: {
int oldirq;
int newirq = arg;
struct lp_struct *lp = &lp_table[minor];
if (!suser())
return -EPERM;
oldirq = LP_IRQ(minor);
/* Allocate buffer now if we are going to need it */
if (!oldirq && newirq) {
lp->lp_buffer = (char *) kmalloc(LP_BUFFER_SIZE, GFP_KERNEL);
if (!lp->lp_buffer)
return -ENOMEM;
}
if (oldirq) {
free_irq(oldirq);
}
if (newirq) {
/* Install new irq */
if ((retval = request_irq(newirq, lp_interrupt, SA_INTERRUPT, "printer"))) {
if (oldirq) {
/* restore old irq */
request_irq(oldirq, lp_interrupt, SA_INTERRUPT, "printer");
} else {
/* We don't need the buffer */
kfree_s(lp->lp_buffer, LP_BUFFER_SIZE);
lp->lp_buffer = NULL;
}
return retval;
}
}
if (oldirq && !newirq) {
/* We don't need the buffer */
kfree_s(lp->lp_buffer, LP_BUFFER_SIZE);
lp->lp_buffer = NULL;
}
LP_IRQ(minor) = newirq;
lp_reset(minor);
break;
}
case LPGETIRQ:
retval = LP_IRQ(minor);
break;
default:
retval = -EINVAL;
}
return retval;
}
static struct file_operations lp_fops = {
lp_lseek,
NULL, /* lp_read */
lp_write,
NULL, /* lp_readdir */
NULL, /* lp_select */
lp_ioctl,
NULL, /* lp_mmap */
lp_open,
lp_release
};
#ifndef MODULE
long lp_init(long kmem_start)
{
int offset = 0;
unsigned int testvalue = 0;
int count = 0;
if (register_chrdev(LP_MAJOR,"lp",&lp_fops)) {
printk("unable to get major %d for line printer\n", LP_MAJOR);
return kmem_start;
}
/* take on all known port values */
for (offset = 0; offset < LP_NO; offset++) {
if (check_region(LP_B(offset), 3))
continue;
/* write to port & read back to check */
outb_p( LP_DUMMY, LP_B(offset));
for (testvalue = 0 ; testvalue < LP_DELAY ; testvalue++)
;
testvalue = inb_p(LP_B(offset));
if (testvalue == LP_DUMMY) {
LP_F(offset) |= LP_EXIST;
lp_reset(offset);
printk("lp%d at 0x%04x, ", offset,LP_B(offset));
snarf_region(LP_B(offset), 3);
if (LP_IRQ(offset))
printk("using IRQ%d\n", LP_IRQ(offset));
else
printk("using polling driver\n");
count++;
}
}
if (count == 0)
printk("lp_init: no lp devices found\n");
return kmem_start;
}
#else
char kernel_version[]= UTS_RELEASE;
int init_module(void)
{
int offset = 0;
unsigned int testvalue = 0;
int count = 0;
if (register_chrdev(LP_MAJOR,"lp",&lp_fops)) {
printk("unable to get major %d for line printer\n", LP_MAJOR);
return -EIO;
}
/* take on all known port values */
for (offset = 0; offset < LP_NO; offset++) {
/* write to port & read back to check */
outb_p( LP_DUMMY, LP_B(offset));
for (testvalue = 0 ; testvalue < LP_DELAY ; testvalue++)
;
testvalue = inb_p(LP_B(offset));
if (testvalue == LP_DUMMY) {
LP_F(offset) |= LP_EXIST;
lp_reset(offset);
printk("lp%d at 0x%04x, ", offset,LP_B(offset));
snarf_region(LP_B(offset),3);
if (LP_IRQ(offset))
printk("using IRQ%d\n", LP_IRQ(offset));
else
printk("using polling driver\n");
count++;
}
}
if (count == 0)
printk("lp_init: no lp devices found\n");
return 0;
}
void cleanup_module(void)
{
int offset;
if(MOD_IN_USE)
printk("lp: busy - remove delayed\n");
else
unregister_chrdev(LP_MAJOR,"lp");
for (offset = 0; offset < LP_NO; offset++)
if(LP_F(offset) && LP_EXIST)
release_region(LP_B(offset),3);
}
#endif
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