diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/char/lp.c | 1126 |
1 files changed, 1126 insertions, 0 deletions
diff --git a/drivers/char/lp.c b/drivers/char/lp.c new file mode 100644 index 0000000000..2f171d14b9 --- /dev/null +++ b/drivers/char/lp.c @@ -0,0 +1,1126 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Generic parallel printer driver + * + * 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 <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_CONSOLE +static 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_COMPAT +static 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 MODULE +static 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, + .devmodel = true, +}; + +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_LICENSE("GPL"); |