/* * 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 */ /* This driver is about due for a rewrite. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* 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 pardevice *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); unsigned int irq; if ((irq = LP_IRQ(minor)) != PARPORT_IRQ_NONE) { 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; 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 "lp=" or "lp=0" */ parport[0] = -2; } else { printk(KERN_WARNING "warning: 'lp=0x%x' is deprecated, ignored\n", ints[1]); } } } #endif void lp_wakeup(void *ref) { struct lp_struct *lp_dev = (struct lp_struct *) ref; if (!lp_dev->lp_wait_q) return; /* Wake up whom? */ /* Claim the Parport */ if (parport_claim(lp_dev->dev)) return; /* Shouldn't happen */ wake_up(&lp_dev->lp_wait_q); } 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; } int lp_init(void) { int count = 0; struct parport *pb; if (parport[0] == -2) return 0; pb = parport_enumerate(); while (pb) { /* We only understand PC-style ports. */ if (pb->modes & PARPORT_MODE_PCSPP) { 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 (%s).\n", count, pb->name, (pb->irq == PARPORT_IRQ_NONE)?"polling":"interrupt-driven"); } if (++count == LP_NO) break; } pb = pb->next; } /* Successful specified devices increase count * Unsuccessful specified devices increase failed */ if (count) { if (register_chrdev(LP_MAJOR, "lp", &lp_fops)) { printk("lp: unable to get major %d\n", LP_MAJOR); return -EIO; } return 0; } printk(KERN_INFO "lp: driver loaded but no devices found\n"); #ifdef MODULE return 0; #else return 1; #endif } #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