lp.c

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	lp_table[minor].lp_buffer = (char *) kmalloc(LP_BUFFER_SIZE, GFP_KERNEL);
	if (!lp_table[minor].lp_buffer) {
		LP_F(minor) &= ~LP_BUSY;
		return -ENOMEM;
	}
	/* 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 {
		printk (KERN_INFO "lp%d: compatibility mode\n", minor);
		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;
	return 0;
}

static int lp_release(struct inode * inode, struct file * file)
{
	unsigned int minor = MINOR(inode->i_rdev);

	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]);
	lock_kernel();
	kfree(lp_table[minor].lp_buffer);
	lp_table[minor].lp_buffer = NULL;
	LP_F(minor) &= ~LP_BUSY;
	unlock_kernel();
	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 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 ) {
		struct timeval par_timeout;
		long to_jiffies;

		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:
			if (copy_to_user((int *) arg, &LP_IRQ(minor),
					sizeof(int)))
				return -EFAULT;
			break;
		case LPGETSTATUS:
			lp_claim_parport_or_block (&lp_table[minor]);
			status = r_str(minor);
			lp_release_parport (&lp_table[minor]);

			if (copy_to_user((int *) arg, &status, sizeof(int)))
				return -EFAULT;
			break;
		case LPRESET:
			lp_reset(minor);
			break;
#ifdef LP_STATS
		case LPGETSTATS:
			if (copy_to_user((int *) arg, &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((int *) arg, &status, sizeof(int)))
				return -EFAULT;
			break;

		case LPSETTIMEOUT:
			if (copy_from_user (&par_timeout,
					    (struct timeval *) arg,
					    sizeof (struct timeval))) {
				return -EFAULT;
			}
			/* Convert to jiffies, place in lp_table */
			if ((par_timeout.tv_sec < 0) ||
			    (par_timeout.tv_usec < 0)) {
				return -EINVAL;
			}
			to_jiffies = ROUND_UP(par_timeout.tv_usec, 1000000/HZ);
			to_jiffies += par_timeout.tv_sec * (long) HZ;
			if (to_jiffies <= 0) {
				return -EINVAL;
			}
			lp_table[minor].timeout = to_jiffies;
			break;

		default:
			retval = -EINVAL;
	}
	return retval;
}

static struct file_operations lp_fops = {
	owner:		THIS_MODULE,
	write:		lp_write,
	ioctl:		lp_ioctl,
	open:		lp_open,
	release:	lp_release,
#ifdef CONFIG_PARPORT_1284
	read:		lp_read,
#endif
};

/* --- 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 kdev_t lp_console_device (struct console *c)
{
	return MKDEV(LP_MAJOR, CONSOLE_LP);
}

static struct console lpcons = {
	name:		"lp",
	write:		lp_console_write,
	device:		lp_console_device,
	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] = { NULL,  };
static int reset = 0;

MODULE_PARM(parport, "1-" __MODULE_STRING(LP_NO) "s");
MODULE_PARM(reset, "i");

#ifndef MODULE
static int __init lp_setup (char *str)
{
	static int parport_ptr; // initially zero
	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")) {
		parport_nr[parport_ptr++] = LP_PARPORT_NONE;
	} else if (!strcmp(str, "reset")) {
		reset = 1;
	}
	return 1;
}
#endif

static int lp_register(int nr, struct parport *port)
{
	char name[8];

	lp_table[nr].dev = parport_register_device(port, "lp", 
						   lp_preempt, NULL, NULL, 0,
						   (void *) &lp_table[nr]);
	if (lp_table[nr].dev == NULL)
		return 1;
	lp_table[nr].flags |= LP_EXIST;

	if (reset)
		lp_reset(nr);

	sprintf (name, "%d", nr);
	devfs_register (devfs_handle, name,
			DEVFS_FL_DEFAULT, LP_MAJOR, nr,
			S_IFCHR | S_IRUGO | S_IWUGO,
			&lp_fops, NULL);

	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

	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("lp: ignoring parallel port (max. %d)\n",LP_NO);
			return;
		}
		if (!lp_register(lp_count, 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)
{
	/* Write this some day. */
#ifdef CONFIG_LP_CONSOLE
	if (console_registered == port) {
		unregister_console (&lpcons);
		console_registered = NULL;
	}
#endif /* CONFIG_LP_CONSOLE */
}

static struct parport_driver lp_driver = {
	"lp",
	lp_attach,
	lp_detach,
	NULL
};

int __init lp_init (void)
{
	int i;

	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);
		init_MUTEX (&lp_table[i].port_mutex);
		lp_table[i].timeout = 10 * HZ;
	}

	if (devfs_register_chrdev (LP_MAJOR, "lp", &lp_fops)) {
		printk ("lp: unable to get major %d\n", LP_MAJOR);
		return -EIO;
	}

	devfs_handle = devfs_mk_dir (NULL, "printers", NULL);

	if (parport_register_driver (&lp_driver)) {
		printk ("lp: unable to register with parport\n");
		return -EIO;
	}

	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;
}

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)
{
	unsigned int offset;

	parport_unregister_driver (&lp_driver);

#ifdef CONFIG_LP_CONSOLE
	unregister_console (&lpcons);
#endif

	devfs_unregister (devfs_handle);
	devfs_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);
	}
}

__setup("lp=", lp_setup);
module_init(lp_init_module);
module_exit(lp_cleanup_module);

MODULE_LICENSE("GPL");
EXPORT_NO_SYMBOLS;