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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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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/signal.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 <linux/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 int port_num[LP_NO];
static unsigned int lp_count = 0;static const struct class lp_class = { .name = "printer",};
#ifdef CONFIG_LP_CONSOLEstatic 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; 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, s64 tv_sec, long tv_usec){ long to_jiffies;
/* Convert to jiffies, place in lp_table */ if (tv_sec < 0 || tv_usec < 0) return -EINVAL;
/* * we used to not check, so let's not make this fatal, * but deal with user space passing a 32-bit tv_nsec in * a 64-bit field, capping the timeout to 1 second * worth of microseconds, and capping the total at * MAX_JIFFY_OFFSET. */ if (tv_usec > 999999) tv_usec = 999999;
if (tv_sec >= MAX_SEC_IN_JIFFIES - 1) { to_jiffies = MAX_JIFFY_OFFSET; } else { to_jiffies = DIV_ROUND_UP(tv_usec, 1000000/HZ); to_jiffies += tv_sec * (long) HZ; }
if (to_jiffies <= 0) { return -EINVAL; } lp_table[minor].timeout = to_jiffies; return 0;}
static int lp_set_timeout32(unsigned int minor, void __user *arg){ s32 karg[2];
if (copy_from_user(karg, arg, sizeof(karg))) return -EFAULT;
return lp_set_timeout(minor, karg[0], karg[1]);}
static int lp_set_timeout64(unsigned int minor, void __user *arg){ s64 karg[2];
if (copy_from_user(karg, arg, sizeof(karg))) return -EFAULT;
/* sparc64 suseconds_t is 32-bit only */ if (IS_ENABLED(CONFIG_SPARC64) && !in_compat_syscall()) karg[1] >>= 32;
return lp_set_timeout(minor, karg[0], karg[1]);}
static long lp_ioctl(struct file *file, unsigned int cmd, unsigned long arg){ unsigned int minor; int ret;
minor = iminor(file_inode(file)); mutex_lock(&lp_mutex); switch (cmd) { case LPSETTIMEOUT_OLD: if (BITS_PER_LONG == 32) { ret = lp_set_timeout32(minor, (void __user *)arg); break; } fallthrough; /* for 64-bit */ case LPSETTIMEOUT_NEW: ret = lp_set_timeout64(minor, (void __user *)arg); break; default: ret = lp_do_ioctl(minor, cmd, arg, (void __user *)arg); break; } mutex_unlock(&lp_mutex);
return ret;}
#ifdef CONFIG_COMPATstatic long lp_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg){ unsigned int minor; int ret;
minor = iminor(file_inode(file)); mutex_lock(&lp_mutex); switch (cmd) { case LPSETTIMEOUT_OLD: if (!COMPAT_USE_64BIT_TIME) { ret = lp_set_timeout32(minor, (void __user *)arg); break; } fallthrough; /* for x32 mode */ case LPSETTIMEOUT_NEW: ret = lp_set_timeout64(minor, (void __user *)arg); 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 MODULEstatic 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")) { if (parport_ptr < LP_NO) parport_nr[parport_ptr++] = LP_PARPORT_NONE; else printk(KERN_INFO "lp: too many ports, %s ignored.\n", str); } else if (!strcmp(str, "reset")) { reset = true; } return 1;}#endif
static int lp_register(int nr, struct parport *port){ struct pardev_cb ppdev_cb;
memset(&ppdev_cb, 0, sizeof(ppdev_cb)); ppdev_cb.preempt = lp_preempt; ppdev_cb.private = &lp_table[nr]; lp_table[nr].dev = parport_register_dev_model(port, "lp", &ppdev_cb, 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 port_num[nr] = port->number;
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; } for (i = 0; i < LP_NO; i++) if (port_num[i] == -1) break;
if (!lp_register(i, 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){ int n;
/* Write this some day. */#ifdef CONFIG_LP_CONSOLE if (console_registered == port) { unregister_console(&lpcons); console_registered = NULL; }#endif /* CONFIG_LP_CONSOLE */
for (n = 0; n < LP_NO; n++) { if (port_num[n] == port->number) { port_num[n] = -1; lp_count--; device_destroy(&lp_class, MKDEV(LP_MAJOR, n)); parport_unregister_device(lp_table[n].dev); } }}
static struct parport_driver lp_driver = { .name = "lp", .match_port = lp_attach, .detach = lp_detach,};
static int __init lp_init(void){ int i, err;
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; port_num[i] = -1; }
if (register_chrdev(LP_MAJOR, "lp", &lp_fops)) { printk(KERN_ERR "lp: unable to get major %d\n", LP_MAJOR); return -EIO; }
err = class_register(&lp_class); if (err) 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_unregister(&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){ parport_unregister_driver(&lp_driver);
#ifdef CONFIG_LP_CONSOLE unregister_console(&lpcons);#endif
unregister_chrdev(LP_MAJOR, "lp"); class_unregister(&lp_class);}
__setup("lp=", lp_setup);module_init(lp_init_module);module_exit(lp_cleanup_module);
MODULE_ALIAS_CHARDEV_MAJOR(LP_MAJOR);MODULE_DESCRIPTION("Generic parallel printer driver");MODULE_LICENSE("GPL");