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1626 |
jcastillo |
/*
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* Copyright (C) 1992 by Jim Weigand and Linus Torvalds
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* Copyright (C) 1992,1993 by Michael K. Johnson
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* - Thanks much to Gunter Windau for pointing out to me where the error
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* checking ought to be.
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* Copyright (C) 1993 by Nigel Gamble (added interrupt code)
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* Copyright (C) 1994 by Alan Cox (Modularised it)
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* LPCAREFUL, LPABORT, LPGETSTATUS added by Chris Metcalf, metcalf@lcs.mit.edu
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* Statistics and support for slow printers by Rob Janssen, rob@knoware.nl
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* "lp=" command line parameters added by Grant Guenther, grant@torque.net
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*/
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/major.h>
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#include <linux/sched.h>
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#include <linux/lp.h>
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#include <linux/malloc.h>
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#include <linux/ioport.h>
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#include <linux/fcntl.h>
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#include <linux/delay.h>
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#include <asm/io.h>
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#include <asm/segment.h>
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#include <asm/system.h>
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/* the BIOS manuals say there can be up to 4 lpt devices
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* but I have not seen a board where the 4th address is listed
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* if you have different hardware change the table below
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* please let me know if you have different equipment
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* if you have more than 3 printers, remember to increase LP_NO
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*/
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struct lp_struct lp_table[] = {
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{ 0x3bc, 0, 0, LP_INIT_CHAR, LP_INIT_TIME, LP_INIT_WAIT, NULL, NULL, 0, 0, 0, {0} },
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{ 0x378, 0, 0, LP_INIT_CHAR, LP_INIT_TIME, LP_INIT_WAIT, NULL, NULL, 0, 0, 0, {0} },
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{ 0x278, 0, 0, LP_INIT_CHAR, LP_INIT_TIME, LP_INIT_WAIT, NULL, NULL, 0, 0, 0, {0} },
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};
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#define LP_NO 3
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/* Test if printer is ready (and optionally has no error conditions) */
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#define LP_READY(minor, status) \
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((LP_F(minor) & LP_CAREFUL) ? _LP_CAREFUL_READY(status) : (status & LP_PBUSY))
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#define LP_CAREFUL_READY(minor, status) \
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((LP_F(minor) & LP_CAREFUL) ? _LP_CAREFUL_READY(status) : 1)
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#define _LP_CAREFUL_READY(status) \
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(status & (LP_PBUSY|LP_POUTPA|LP_PSELECD|LP_PERRORP)) == \
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(LP_PBUSY|LP_PSELECD|LP_PERRORP)
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/*
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* All my debugging code assumes that you debug with only one printer at
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* a time. RWWH
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* Debug info moved into stats area, so this is no longer true (Rob Janssen)
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*/
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#undef LP_DEBUG
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static int lp_reset(int minor)
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{
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outb_p(LP_PSELECP, LP_C(minor));
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udelay(LP_DELAY);
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outb_p(LP_PSELECP | LP_PINITP, LP_C(minor));
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return LP_S(minor);
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}
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static inline int lp_char_polled(char lpchar, int minor)
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{
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int status, wait = 0;
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unsigned long count = 0;
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struct lp_stats *stats;
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do {
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status = LP_S(minor);
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count ++;
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if(need_resched)
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schedule();
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} while(!LP_READY(minor,status) && count < LP_CHAR(minor));
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if (count == LP_CHAR(minor)) {
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return 0;
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/* we timed out, and the character was /not/ printed */
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}
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outb_p(lpchar, LP_B(minor));
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stats = &LP_STAT(minor);
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stats->chars++;
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/* must wait before taking strobe high, and after taking strobe
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low, according spec. Some printers need it, others don't. */
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while(wait != LP_WAIT(minor)) wait++;
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/* control port takes strobe high */
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outb_p(( LP_PSELECP | LP_PINITP | LP_PSTROBE ), ( LP_C( minor )));
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if(LP_F(minor)&LP_STRICT)
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{
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/* Wait until NBUSY line goes high */
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count = 0;
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do {
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status = LP_S(minor);
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count++;
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} while (LP_READY(minor, status) && (count<LP_CHAR(minor)));
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}
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else while(wait) wait--;
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/* take strobe low */
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outb_p(( LP_PSELECP | LP_PINITP ), ( LP_C( minor )));
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/* update waittime statistics */
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if (count > stats->maxwait) {
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#ifdef LP_DEBUG
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printk(KERN_DEBUG "lp%d success after %d counts.\n",minor,count);
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#endif
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stats->maxwait = count;
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}
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count *= 256;
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wait = (count > stats->meanwait)? count - stats->meanwait :
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stats->meanwait - count;
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stats->meanwait = (255*stats->meanwait + count + 128) / 256;
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stats->mdev = ((127 * stats->mdev) + wait + 64) / 128;
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| 119 |
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return 1;
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}
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static inline int lp_char_interrupt(char lpchar, int minor)
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{
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int wait;
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unsigned long count = 0;
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unsigned char status;
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struct lp_stats *stats;
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do {
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if(need_resched)
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schedule();
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if ((status = LP_S(minor)) & LP_PBUSY) {
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if (!LP_CAREFUL_READY(minor, status))
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return 0;
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outb_p(lpchar, LP_B(minor));
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stats = &LP_STAT(minor);
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stats->chars++;
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/* must wait before taking strobe high, and after taking strobe
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low, according spec. Some printers need it, others don't. */
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wait = 0;
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while(wait != LP_WAIT(minor)) wait++;
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/* control port takes strobe high */
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outb_p(( LP_PSELECP | LP_PINITP | LP_PSTROBE ), ( LP_C( minor )));
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while(wait) wait--;
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/* take strobe low */
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outb_p(( LP_PSELECP | LP_PINITP ), ( LP_C( minor )));
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/* update waittime statistics */
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if (count) {
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if (count > stats->maxwait)
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stats->maxwait = count;
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count *= 256;
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wait = (count > stats->meanwait)? count - stats->meanwait :
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stats->meanwait - count;
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stats->meanwait = (255*stats->meanwait + count + 128) / 256;
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stats->mdev = ((127 * stats->mdev) + wait + 64) / 128;
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}
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return 1;
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| 158 |
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}
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| 159 |
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} while (count++ < LP_CHAR(minor));
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| 161 |
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return 0;
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}
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| 164 |
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static void lp_interrupt(int irq, void *dev_id, struct pt_regs *regs)
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{
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struct lp_struct *lp = &lp_table[0];
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| 168 |
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while (irq != lp->irq) {
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if (++lp >= &lp_table[LP_NO])
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return;
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}
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| 173 |
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wake_up(&lp->lp_wait_q);
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}
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| 176 |
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static inline int lp_write_interrupt(unsigned int minor, const char * buf, int count)
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{
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unsigned long copy_size;
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unsigned long total_bytes_written = 0;
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| 180 |
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unsigned long bytes_written;
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struct lp_struct *lp = &lp_table[minor];
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unsigned char status;
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| 184 |
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do {
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| 185 |
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bytes_written = 0;
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copy_size = (count <= LP_BUFFER_SIZE ? count : LP_BUFFER_SIZE);
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memcpy_fromfs(lp->lp_buffer, buf, copy_size);
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| 188 |
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| 189 |
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while (copy_size) {
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| 190 |
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if (lp_char_interrupt(lp->lp_buffer[bytes_written], minor)) {
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--copy_size;
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| 192 |
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++bytes_written;
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| 193 |
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lp_table[minor].runchars++;
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| 194 |
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} else {
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| 195 |
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int rc = total_bytes_written + bytes_written;
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| 196 |
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if (lp_table[minor].runchars > LP_STAT(minor).maxrun)
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| 197 |
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LP_STAT(minor).maxrun = lp_table[minor].runchars;
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| 198 |
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status = LP_S(minor);
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| 199 |
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if ((status & LP_POUTPA)) {
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| 200 |
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printk(KERN_INFO "lp%d out of paper\n", minor);
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| 201 |
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if (LP_F(minor) & LP_ABORT)
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| 202 |
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return rc?rc:-ENOSPC;
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| 203 |
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} else if (!(status & LP_PSELECD)) {
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| 204 |
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printk(KERN_INFO "lp%d off-line\n", minor);
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| 205 |
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if (LP_F(minor) & LP_ABORT)
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| 206 |
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return rc?rc:-EIO;
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| 207 |
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} else if (!(status & LP_PERRORP)) {
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| 208 |
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printk(KERN_ERR "lp%d printer error\n", minor);
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| 209 |
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if (LP_F(minor) & LP_ABORT)
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| 210 |
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return rc?rc:-EIO;
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| 211 |
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}
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| 212 |
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LP_STAT(minor).sleeps++;
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| 213 |
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cli();
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| 214 |
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outb_p((LP_PSELECP|LP_PINITP|LP_PINTEN), (LP_C(minor)));
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| 215 |
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status = LP_S(minor);
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| 216 |
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if ((!(status & LP_PACK) || (status & LP_PBUSY))
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| 217 |
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&& LP_CAREFUL_READY(minor, status)) {
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| 218 |
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outb_p((LP_PSELECP|LP_PINITP), (LP_C(minor)));
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| 219 |
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sti();
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| 220 |
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continue;
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| 221 |
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}
|
| 222 |
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lp_table[minor].runchars=0;
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| 223 |
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current->timeout = jiffies + LP_TIMEOUT_INTERRUPT;
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| 224 |
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interruptible_sleep_on(&lp->lp_wait_q);
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| 225 |
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outb_p((LP_PSELECP|LP_PINITP), (LP_C(minor)));
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| 226 |
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sti();
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| 227 |
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if (current->signal & ~current->blocked) {
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| 228 |
|
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if (total_bytes_written + bytes_written)
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| 229 |
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return total_bytes_written + bytes_written;
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| 230 |
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else
|
| 231 |
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return -EINTR;
|
| 232 |
|
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}
|
| 233 |
|
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}
|
| 234 |
|
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}
|
| 235 |
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|
| 236 |
|
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total_bytes_written += bytes_written;
|
| 237 |
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buf += bytes_written;
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| 238 |
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count -= bytes_written;
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| 239 |
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|
| 240 |
|
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} while (count > 0);
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| 241 |
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|
| 242 |
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return total_bytes_written;
|
| 243 |
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}
|
| 244 |
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|
| 245 |
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static inline int lp_write_polled(unsigned int minor, const char * buf, int count)
|
| 246 |
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{
|
| 247 |
|
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int retval,status;
|
| 248 |
|
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char c;
|
| 249 |
|
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const char *temp;
|
| 250 |
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|
| 251 |
|
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temp = buf;
|
| 252 |
|
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while (count > 0) {
|
| 253 |
|
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c = get_user(temp);
|
| 254 |
|
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retval = lp_char_polled(c, minor);
|
| 255 |
|
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/* only update counting vars if character was printed */
|
| 256 |
|
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if (retval) {
|
| 257 |
|
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count--; temp++;
|
| 258 |
|
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lp_table[minor].runchars++;
|
| 259 |
|
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} else { /* if printer timed out */
|
| 260 |
|
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if (lp_table[minor].runchars > LP_STAT(minor).maxrun)
|
| 261 |
|
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LP_STAT(minor).maxrun = lp_table[minor].runchars;
|
| 262 |
|
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status = LP_S(minor);
|
| 263 |
|
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|
| 264 |
|
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if (status & LP_POUTPA) {
|
| 265 |
|
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printk(KERN_INFO "lp%d out of paper\n", minor);
|
| 266 |
|
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if(LP_F(minor) & LP_ABORT)
|
| 267 |
|
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return temp-buf?temp-buf:-ENOSPC;
|
| 268 |
|
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current->state = TASK_INTERRUPTIBLE;
|
| 269 |
|
|
current->timeout = jiffies + LP_TIMEOUT_POLLED;
|
| 270 |
|
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schedule();
|
| 271 |
|
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} else
|
| 272 |
|
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if (!(status & LP_PSELECD)) {
|
| 273 |
|
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printk(KERN_INFO "lp%d off-line\n", minor);
|
| 274 |
|
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if(LP_F(minor) & LP_ABORT)
|
| 275 |
|
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return temp-buf?temp-buf:-EIO;
|
| 276 |
|
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current->state = TASK_INTERRUPTIBLE;
|
| 277 |
|
|
current->timeout = jiffies + LP_TIMEOUT_POLLED;
|
| 278 |
|
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schedule();
|
| 279 |
|
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} else
|
| 280 |
|
|
/* not offline or out of paper. on fire? */
|
| 281 |
|
|
if (!(status & LP_PERRORP)) {
|
| 282 |
|
|
printk(KERN_ERR "lp%d reported invalid error status (on fire, eh?)\n", minor);
|
| 283 |
|
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if(LP_F(minor) & LP_ABORT)
|
| 284 |
|
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return temp-buf?temp-buf:-EIO;
|
| 285 |
|
|
current->state = TASK_INTERRUPTIBLE;
|
| 286 |
|
|
current->timeout = jiffies + LP_TIMEOUT_POLLED;
|
| 287 |
|
|
schedule();
|
| 288 |
|
|
}
|
| 289 |
|
|
|
| 290 |
|
|
/* check for signals before going to sleep */
|
| 291 |
|
|
if (current->signal & ~current->blocked) {
|
| 292 |
|
|
if (temp != buf)
|
| 293 |
|
|
return temp-buf;
|
| 294 |
|
|
else
|
| 295 |
|
|
return -EINTR;
|
| 296 |
|
|
}
|
| 297 |
|
|
LP_STAT(minor).sleeps++;
|
| 298 |
|
|
#ifdef LP_DEBUG
|
| 299 |
|
|
printk(KERN_DEBUG "lp%d sleeping at %d characters for %d jiffies\n",
|
| 300 |
|
|
minor,lp_table[minor].runchars, LP_TIME(minor));
|
| 301 |
|
|
#endif
|
| 302 |
|
|
lp_table[minor].runchars=0;
|
| 303 |
|
|
current->state = TASK_INTERRUPTIBLE;
|
| 304 |
|
|
current->timeout = jiffies + LP_TIME(minor);
|
| 305 |
|
|
schedule();
|
| 306 |
|
|
}
|
| 307 |
|
|
}
|
| 308 |
|
|
return temp-buf;
|
| 309 |
|
|
}
|
| 310 |
|
|
|
| 311 |
|
|
static int lp_write(struct inode * inode, struct file * file, const char * buf, int count)
|
| 312 |
|
|
{
|
| 313 |
|
|
unsigned int minor = MINOR(inode->i_rdev);
|
| 314 |
|
|
|
| 315 |
|
|
if (jiffies-lp_table[minor].lastcall > LP_TIME(minor))
|
| 316 |
|
|
lp_table[minor].runchars = 0;
|
| 317 |
|
|
lp_table[minor].lastcall = jiffies;
|
| 318 |
|
|
|
| 319 |
|
|
if (LP_IRQ(minor))
|
| 320 |
|
|
return lp_write_interrupt(minor, buf, count);
|
| 321 |
|
|
else
|
| 322 |
|
|
return lp_write_polled(minor, buf, count);
|
| 323 |
|
|
}
|
| 324 |
|
|
|
| 325 |
|
|
static int lp_lseek(struct inode * inode, struct file * file,
|
| 326 |
|
|
off_t offset, int origin)
|
| 327 |
|
|
{
|
| 328 |
|
|
return -ESPIPE;
|
| 329 |
|
|
}
|
| 330 |
|
|
|
| 331 |
|
|
static int lp_open(struct inode * inode, struct file * file)
|
| 332 |
|
|
{
|
| 333 |
|
|
unsigned int minor = MINOR(inode->i_rdev);
|
| 334 |
|
|
int ret;
|
| 335 |
|
|
unsigned int irq;
|
| 336 |
|
|
|
| 337 |
|
|
if (minor >= LP_NO)
|
| 338 |
|
|
return -ENXIO;
|
| 339 |
|
|
if ((LP_F(minor) & LP_EXIST) == 0)
|
| 340 |
|
|
return -ENXIO;
|
| 341 |
|
|
if (LP_F(minor) & LP_BUSY)
|
| 342 |
|
|
return -EBUSY;
|
| 343 |
|
|
|
| 344 |
|
|
MOD_INC_USE_COUNT;
|
| 345 |
|
|
|
| 346 |
|
|
/* If ABORTOPEN is set and the printer is offline or out of paper,
|
| 347 |
|
|
we may still want to open it to perform ioctl()s. Therefore we
|
| 348 |
|
|
have commandeered O_NONBLOCK, even though it is being used in
|
| 349 |
|
|
a non-standard manner. This is strictly a Linux hack, and
|
| 350 |
|
|
should most likely only ever be used by the tunelp application. */
|
| 351 |
|
|
if ((LP_F(minor) & LP_ABORTOPEN) && !(file->f_flags & O_NONBLOCK)) {
|
| 352 |
|
|
int status = LP_S(minor);
|
| 353 |
|
|
if (status & LP_POUTPA) {
|
| 354 |
|
|
printk(KERN_INFO "lp%d out of paper\n", minor);
|
| 355 |
|
|
MOD_DEC_USE_COUNT;
|
| 356 |
|
|
return -ENOSPC;
|
| 357 |
|
|
} else if (!(status & LP_PSELECD)) {
|
| 358 |
|
|
printk(KERN_INFO "lp%d off-line\n", minor);
|
| 359 |
|
|
MOD_DEC_USE_COUNT;
|
| 360 |
|
|
return -EIO;
|
| 361 |
|
|
} else if (!(status & LP_PERRORP)) {
|
| 362 |
|
|
printk(KERN_ERR "lp%d printer error\n", minor);
|
| 363 |
|
|
MOD_DEC_USE_COUNT;
|
| 364 |
|
|
return -EIO;
|
| 365 |
|
|
}
|
| 366 |
|
|
}
|
| 367 |
|
|
|
| 368 |
|
|
if ((irq = LP_IRQ(minor))) {
|
| 369 |
|
|
lp_table[minor].lp_buffer = (char *) kmalloc(LP_BUFFER_SIZE, GFP_KERNEL);
|
| 370 |
|
|
if (!lp_table[minor].lp_buffer) {
|
| 371 |
|
|
MOD_DEC_USE_COUNT;
|
| 372 |
|
|
return -ENOMEM;
|
| 373 |
|
|
}
|
| 374 |
|
|
|
| 375 |
|
|
ret = request_irq(irq, lp_interrupt, SA_INTERRUPT, "printer", NULL);
|
| 376 |
|
|
if (ret) {
|
| 377 |
|
|
kfree_s(lp_table[minor].lp_buffer, LP_BUFFER_SIZE);
|
| 378 |
|
|
lp_table[minor].lp_buffer = NULL;
|
| 379 |
|
|
printk("lp%d unable to use interrupt %d, error %d\n", minor, irq, ret);
|
| 380 |
|
|
MOD_DEC_USE_COUNT;
|
| 381 |
|
|
return ret;
|
| 382 |
|
|
}
|
| 383 |
|
|
}
|
| 384 |
|
|
|
| 385 |
|
|
LP_F(minor) |= LP_BUSY;
|
| 386 |
|
|
return 0;
|
| 387 |
|
|
}
|
| 388 |
|
|
|
| 389 |
|
|
static void lp_release(struct inode * inode, struct file * file)
|
| 390 |
|
|
{
|
| 391 |
|
|
unsigned int minor = MINOR(inode->i_rdev);
|
| 392 |
|
|
unsigned int irq;
|
| 393 |
|
|
|
| 394 |
|
|
if ((irq = LP_IRQ(minor))) {
|
| 395 |
|
|
free_irq(irq, NULL);
|
| 396 |
|
|
kfree_s(lp_table[minor].lp_buffer, LP_BUFFER_SIZE);
|
| 397 |
|
|
lp_table[minor].lp_buffer = NULL;
|
| 398 |
|
|
}
|
| 399 |
|
|
|
| 400 |
|
|
LP_F(minor) &= ~LP_BUSY;
|
| 401 |
|
|
MOD_DEC_USE_COUNT;
|
| 402 |
|
|
}
|
| 403 |
|
|
|
| 404 |
|
|
|
| 405 |
|
|
static int lp_ioctl(struct inode *inode, struct file *file,
|
| 406 |
|
|
unsigned int cmd, unsigned long arg)
|
| 407 |
|
|
{
|
| 408 |
|
|
unsigned int minor = MINOR(inode->i_rdev);
|
| 409 |
|
|
int retval = 0;
|
| 410 |
|
|
|
| 411 |
|
|
#ifdef LP_DEBUG
|
| 412 |
|
|
printk(KERN_DEBUG "lp%d ioctl, cmd: 0x%x, arg: 0x%x\n", minor, cmd, arg);
|
| 413 |
|
|
#endif
|
| 414 |
|
|
if (minor >= LP_NO)
|
| 415 |
|
|
return -ENODEV;
|
| 416 |
|
|
if ((LP_F(minor) & LP_EXIST) == 0)
|
| 417 |
|
|
return -ENODEV;
|
| 418 |
|
|
switch ( cmd ) {
|
| 419 |
|
|
case LPTIME:
|
| 420 |
|
|
LP_TIME(minor) = arg * HZ/100;
|
| 421 |
|
|
break;
|
| 422 |
|
|
case LPCHAR:
|
| 423 |
|
|
LP_CHAR(minor) = arg;
|
| 424 |
|
|
break;
|
| 425 |
|
|
case LPABORT:
|
| 426 |
|
|
if (arg)
|
| 427 |
|
|
LP_F(minor) |= LP_ABORT;
|
| 428 |
|
|
else
|
| 429 |
|
|
LP_F(minor) &= ~LP_ABORT;
|
| 430 |
|
|
break;
|
| 431 |
|
|
case LPABORTOPEN:
|
| 432 |
|
|
if (arg)
|
| 433 |
|
|
LP_F(minor) |= LP_ABORTOPEN;
|
| 434 |
|
|
else
|
| 435 |
|
|
LP_F(minor) &= ~LP_ABORTOPEN;
|
| 436 |
|
|
break;
|
| 437 |
|
|
case LPCAREFUL:
|
| 438 |
|
|
if (arg)
|
| 439 |
|
|
LP_F(minor) |= LP_CAREFUL;
|
| 440 |
|
|
else
|
| 441 |
|
|
LP_F(minor) &= ~LP_CAREFUL;
|
| 442 |
|
|
break;
|
| 443 |
|
|
case LPSTRICT:
|
| 444 |
|
|
if (arg)
|
| 445 |
|
|
LP_F(minor) |= LP_STRICT;
|
| 446 |
|
|
else
|
| 447 |
|
|
LP_F(minor) &= ~LP_STRICT;
|
| 448 |
|
|
break;
|
| 449 |
|
|
case LPWAIT:
|
| 450 |
|
|
LP_WAIT(minor) = arg;
|
| 451 |
|
|
break;
|
| 452 |
|
|
case LPSETIRQ: {
|
| 453 |
|
|
int oldirq;
|
| 454 |
|
|
int newirq = arg;
|
| 455 |
|
|
struct lp_struct *lp = &lp_table[minor];
|
| 456 |
|
|
|
| 457 |
|
|
if (!suser())
|
| 458 |
|
|
return -EPERM;
|
| 459 |
|
|
|
| 460 |
|
|
oldirq = LP_IRQ(minor);
|
| 461 |
|
|
|
| 462 |
|
|
/* Allocate buffer now if we are going to need it */
|
| 463 |
|
|
if (!oldirq && newirq) {
|
| 464 |
|
|
lp->lp_buffer = (char *) kmalloc(LP_BUFFER_SIZE, GFP_KERNEL);
|
| 465 |
|
|
if (!lp->lp_buffer)
|
| 466 |
|
|
return -ENOMEM;
|
| 467 |
|
|
}
|
| 468 |
|
|
|
| 469 |
|
|
if (oldirq) {
|
| 470 |
|
|
free_irq(oldirq, NULL);
|
| 471 |
|
|
}
|
| 472 |
|
|
if (newirq) {
|
| 473 |
|
|
/* Install new irq */
|
| 474 |
|
|
if ((retval = request_irq(newirq, lp_interrupt, SA_INTERRUPT, "printer", NULL))) {
|
| 475 |
|
|
if (oldirq) {
|
| 476 |
|
|
/* restore old irq */
|
| 477 |
|
|
request_irq(oldirq, lp_interrupt, SA_INTERRUPT, "printer", NULL);
|
| 478 |
|
|
} else {
|
| 479 |
|
|
/* We don't need the buffer */
|
| 480 |
|
|
kfree_s(lp->lp_buffer, LP_BUFFER_SIZE);
|
| 481 |
|
|
lp->lp_buffer = NULL;
|
| 482 |
|
|
}
|
| 483 |
|
|
return retval;
|
| 484 |
|
|
}
|
| 485 |
|
|
}
|
| 486 |
|
|
if (oldirq && !newirq) {
|
| 487 |
|
|
/* We don't need the buffer */
|
| 488 |
|
|
kfree_s(lp->lp_buffer, LP_BUFFER_SIZE);
|
| 489 |
|
|
lp->lp_buffer = NULL;
|
| 490 |
|
|
}
|
| 491 |
|
|
LP_IRQ(minor) = newirq;
|
| 492 |
|
|
lp_reset(minor);
|
| 493 |
|
|
break;
|
| 494 |
|
|
}
|
| 495 |
|
|
case LPGETIRQ:
|
| 496 |
|
|
retval = verify_area(VERIFY_WRITE, (void *) arg,
|
| 497 |
|
|
sizeof(int));
|
| 498 |
|
|
if (retval)
|
| 499 |
|
|
return retval;
|
| 500 |
|
|
memcpy_tofs((int *) arg, &LP_IRQ(minor), sizeof(int));
|
| 501 |
|
|
break;
|
| 502 |
|
|
case LPGETSTATUS:
|
| 503 |
|
|
retval = verify_area(VERIFY_WRITE, (void *) arg,
|
| 504 |
|
|
sizeof(int));
|
| 505 |
|
|
if (retval)
|
| 506 |
|
|
return retval;
|
| 507 |
|
|
else {
|
| 508 |
|
|
int status = LP_S(minor);
|
| 509 |
|
|
memcpy_tofs((int *) arg, &status, sizeof(int));
|
| 510 |
|
|
}
|
| 511 |
|
|
break;
|
| 512 |
|
|
case LPRESET:
|
| 513 |
|
|
lp_reset(minor);
|
| 514 |
|
|
break;
|
| 515 |
|
|
case LPGETSTATS:
|
| 516 |
|
|
retval = verify_area(VERIFY_WRITE, (void *) arg,
|
| 517 |
|
|
sizeof(struct lp_stats));
|
| 518 |
|
|
if (retval)
|
| 519 |
|
|
return retval;
|
| 520 |
|
|
else {
|
| 521 |
|
|
memcpy_tofs((int *) arg, &LP_STAT(minor), sizeof(struct lp_stats));
|
| 522 |
|
|
if (suser())
|
| 523 |
|
|
memset(&LP_STAT(minor), 0, sizeof(struct lp_stats));
|
| 524 |
|
|
}
|
| 525 |
|
|
break;
|
| 526 |
|
|
case LPGETFLAGS:
|
| 527 |
|
|
retval = verify_area(VERIFY_WRITE, (void *) arg,
|
| 528 |
|
|
sizeof(int));
|
| 529 |
|
|
if (retval)
|
| 530 |
|
|
return retval;
|
| 531 |
|
|
else {
|
| 532 |
|
|
int status = LP_F(minor);
|
| 533 |
|
|
memcpy_tofs((int *) arg, &status, sizeof(int));
|
| 534 |
|
|
}
|
| 535 |
|
|
break;
|
| 536 |
|
|
default:
|
| 537 |
|
|
retval = -EINVAL;
|
| 538 |
|
|
}
|
| 539 |
|
|
return retval;
|
| 540 |
|
|
}
|
| 541 |
|
|
|
| 542 |
|
|
|
| 543 |
|
|
static struct file_operations lp_fops = {
|
| 544 |
|
|
lp_lseek,
|
| 545 |
|
|
NULL, /* lp_read */
|
| 546 |
|
|
lp_write,
|
| 547 |
|
|
NULL, /* lp_readdir */
|
| 548 |
|
|
NULL, /* lp_select */
|
| 549 |
|
|
lp_ioctl,
|
| 550 |
|
|
NULL, /* lp_mmap */
|
| 551 |
|
|
lp_open,
|
| 552 |
|
|
lp_release
|
| 553 |
|
|
};
|
| 554 |
|
|
|
| 555 |
|
|
static int lp_probe(int offset)
|
| 556 |
|
|
{
|
| 557 |
|
|
int base, size;
|
| 558 |
|
|
unsigned int testvalue;
|
| 559 |
|
|
|
| 560 |
|
|
base = LP_B(offset);
|
| 561 |
|
|
if (base == 0)
|
| 562 |
|
|
return -1; /* de-configured by command line */
|
| 563 |
|
|
if (LP_IRQ(offset) > 15)
|
| 564 |
|
|
return -1; /* bogus interrupt value */
|
| 565 |
|
|
size = (base == 0x3bc)? 3 : 8;
|
| 566 |
|
|
if (check_region(base, size) < 0)
|
| 567 |
|
|
return -1;
|
| 568 |
|
|
/* write to port & read back to check */
|
| 569 |
|
|
outb_p(LP_DUMMY, base);
|
| 570 |
|
|
udelay(LP_DELAY);
|
| 571 |
|
|
testvalue = inb_p(base);
|
| 572 |
|
|
if (testvalue == LP_DUMMY) {
|
| 573 |
|
|
LP_F(offset) |= LP_EXIST;
|
| 574 |
|
|
lp_reset(offset);
|
| 575 |
|
|
printk(KERN_INFO "lp%d at 0x%04x, ", offset, base);
|
| 576 |
|
|
request_region(base, size, "lp");
|
| 577 |
|
|
if (LP_IRQ(offset))
|
| 578 |
|
|
printk("(irq = %d)\n", LP_IRQ(offset));
|
| 579 |
|
|
else
|
| 580 |
|
|
printk("(polling)\n");
|
| 581 |
|
|
return 1;
|
| 582 |
|
|
} else
|
| 583 |
|
|
return 0;
|
| 584 |
|
|
}
|
| 585 |
|
|
|
| 586 |
|
|
/* Command line parameters:
|
| 587 |
|
|
|
| 588 |
|
|
When the lp driver is built in to the kernel, you may use the
|
| 589 |
|
|
LILO/LOADLIN command line to set the port addresses and interrupts
|
| 590 |
|
|
that the driver will use.
|
| 591 |
|
|
|
| 592 |
|
|
Syntax: lp=port0[,irq0[,port1[,irq1[,port2[,irq2]]]]]
|
| 593 |
|
|
|
| 594 |
|
|
For example: lp=0x378,0 or lp=0x278,5,0x378,7
|
| 595 |
|
|
|
| 596 |
|
|
Note that if this feature is used, you must specify *all* the ports
|
| 597 |
|
|
you want considered, there are no defaults. You can disable a
|
| 598 |
|
|
built-in driver with lp=0 .
|
| 599 |
|
|
|
| 600 |
|
|
*/
|
| 601 |
|
|
|
| 602 |
|
|
void lp_setup(char *str, int *ints)
|
| 603 |
|
|
|
| 604 |
|
|
{
|
| 605 |
|
|
LP_B(0) = ((ints[0] > 0) ? ints[1] : 0 );
|
| 606 |
|
|
LP_IRQ(0) = ((ints[0] > 1) ? ints[2] : 0 );
|
| 607 |
|
|
LP_B(1) = ((ints[0] > 2) ? ints[3] : 0 );
|
| 608 |
|
|
LP_IRQ(1) = ((ints[0] > 3) ? ints[4] : 0 );
|
| 609 |
|
|
LP_B(2) = ((ints[0] > 4) ? ints[5] : 0 );
|
| 610 |
|
|
LP_IRQ(2) = ((ints[0] > 5) ? ints[6] : 0 );
|
| 611 |
|
|
}
|
| 612 |
|
|
|
| 613 |
|
|
#ifdef MODULE
|
| 614 |
|
|
static int io[] = {0, 0, 0};
|
| 615 |
|
|
static int irq[] = {0, 0, 0};
|
| 616 |
|
|
|
| 617 |
|
|
#define lp_init init_module
|
| 618 |
|
|
#endif
|
| 619 |
|
|
|
| 620 |
|
|
int lp_init(void)
|
| 621 |
|
|
{
|
| 622 |
|
|
int offset = 0;
|
| 623 |
|
|
int count = 0;
|
| 624 |
|
|
#ifdef MODULE
|
| 625 |
|
|
int failed = 0;
|
| 626 |
|
|
#endif
|
| 627 |
|
|
|
| 628 |
|
|
if (register_chrdev(LP_MAJOR,"lp",&lp_fops)) {
|
| 629 |
|
|
printk("lp: unable to get major %d\n", LP_MAJOR);
|
| 630 |
|
|
return -EIO;
|
| 631 |
|
|
}
|
| 632 |
|
|
#ifdef MODULE
|
| 633 |
|
|
/* When user feeds parameters, use them */
|
| 634 |
|
|
for (offset=0; offset < LP_NO; offset++) {
|
| 635 |
|
|
int specified=0;
|
| 636 |
|
|
|
| 637 |
|
|
if (io[offset] != 0) {
|
| 638 |
|
|
LP_B(offset) = io[offset];
|
| 639 |
|
|
specified++;
|
| 640 |
|
|
}
|
| 641 |
|
|
if (irq[offset] != 0) {
|
| 642 |
|
|
LP_IRQ(offset) = irq[offset];
|
| 643 |
|
|
specified++;
|
| 644 |
|
|
}
|
| 645 |
|
|
if (specified) {
|
| 646 |
|
|
if (lp_probe(offset) <= 0) {
|
| 647 |
|
|
printk(KERN_INFO "lp%d: Not found\n", offset);
|
| 648 |
|
|
failed++;
|
| 649 |
|
|
} else
|
| 650 |
|
|
count++;
|
| 651 |
|
|
}
|
| 652 |
|
|
}
|
| 653 |
|
|
/* Successful specified devices increase count
|
| 654 |
|
|
* Unsuccessful specified devices increase failed
|
| 655 |
|
|
*/
|
| 656 |
|
|
if (count)
|
| 657 |
|
|
return 0;
|
| 658 |
|
|
if (failed) {
|
| 659 |
|
|
printk(KERN_INFO "lp: No override devices found.\n");
|
| 660 |
|
|
unregister_chrdev(LP_MAJOR,"lp");
|
| 661 |
|
|
return -EIO;
|
| 662 |
|
|
}
|
| 663 |
|
|
/* Only get here if there were no specified devices. To continue
|
| 664 |
|
|
* would be silly since the above code has scribbled all over the
|
| 665 |
|
|
* probe list.
|
| 666 |
|
|
*/
|
| 667 |
|
|
#endif
|
| 668 |
|
|
/* take on all known port values */
|
| 669 |
|
|
for (offset = 0; offset < LP_NO; offset++) {
|
| 670 |
|
|
int ret = lp_probe(offset);
|
| 671 |
|
|
if (ret < 0)
|
| 672 |
|
|
continue;
|
| 673 |
|
|
count += ret;
|
| 674 |
|
|
}
|
| 675 |
|
|
if (count == 0)
|
| 676 |
|
|
printk("lp: Driver configured but no interfaces found.\n");
|
| 677 |
|
|
|
| 678 |
|
|
return 0;
|
| 679 |
|
|
}
|
| 680 |
|
|
|
| 681 |
|
|
#ifdef MODULE
|
| 682 |
|
|
void cleanup_module(void)
|
| 683 |
|
|
{
|
| 684 |
|
|
int offset;
|
| 685 |
|
|
|
| 686 |
|
|
unregister_chrdev(LP_MAJOR,"lp");
|
| 687 |
|
|
for (offset = 0; offset < LP_NO; offset++) {
|
| 688 |
|
|
int base, size;
|
| 689 |
|
|
base = LP_B(offset);
|
| 690 |
|
|
size = (base == 0x3bc)? 3 : 8;
|
| 691 |
|
|
if (LP_F(offset) & LP_EXIST)
|
| 692 |
|
|
release_region(LP_B(offset),size);
|
| 693 |
|
|
}
|
| 694 |
|
|
}
|
| 695 |
|
|
#endif
|
