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path: root/drivers/char/ppdev.c
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-rw-r--r--drivers/char/ppdev.c824
1 files changed, 824 insertions, 0 deletions
diff --git a/drivers/char/ppdev.c b/drivers/char/ppdev.c
new file mode 100644
index 000000000000..5eda075c62bd
--- /dev/null
+++ b/drivers/char/ppdev.c
@@ -0,0 +1,824 @@
+/*
+ * linux/drivers/char/ppdev.c
+ *
+ * This is the code behind /dev/parport* -- it allows a user-space
+ * application to use the parport subsystem.
+ *
+ * Copyright (C) 1998-2000, 2002 Tim Waugh <tim@cyberelk.net>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * A /dev/parportx device node represents an arbitrary device
+ * on port 'x'. The following operations are possible:
+ *
+ * open do nothing, set up default IEEE 1284 protocol to be COMPAT
+ * close release port and unregister device (if necessary)
+ * ioctl
+ * EXCL register device exclusively (may fail)
+ * CLAIM (register device first time) parport_claim_or_block
+ * RELEASE parport_release
+ * SETMODE set the IEEE 1284 protocol to use for read/write
+ * SETPHASE set the IEEE 1284 phase of a particular mode. Not to be
+ * confused with ioctl(fd, SETPHASER, &stun). ;-)
+ * DATADIR data_forward / data_reverse
+ * WDATA write_data
+ * RDATA read_data
+ * WCONTROL write_control
+ * RCONTROL read_control
+ * FCONTROL frob_control
+ * RSTATUS read_status
+ * NEGOT parport_negotiate
+ * YIELD parport_yield_blocking
+ * WCTLONIRQ on interrupt, set control lines
+ * CLRIRQ clear (and return) interrupt count
+ * SETTIME sets device timeout (struct timeval)
+ * GETTIME gets device timeout (struct timeval)
+ * GETMODES gets hardware supported modes (unsigned int)
+ * GETMODE gets the current IEEE1284 mode
+ * GETPHASE gets the current IEEE1284 phase
+ * GETFLAGS gets current (user-visible) flags
+ * SETFLAGS sets current (user-visible) flags
+ * read/write read or write in current IEEE 1284 protocol
+ * select wait for interrupt (in readfds)
+ *
+ * Changes:
+ * Added SETTIME/GETTIME ioctl, Fred Barnes, 1999.
+ *
+ * Arnaldo Carvalho de Melo <acme@conectiva.com.br> 2000/08/25
+ * - On error, copy_from_user and copy_to_user do not return -EFAULT,
+ * They return the positive number of bytes *not* copied due to address
+ * space errors.
+ *
+ * Added GETMODES/GETMODE/GETPHASE ioctls, Fred Barnes <frmb2@ukc.ac.uk>, 03/01/2001.
+ * Added GETFLAGS/SETFLAGS ioctls, Fred Barnes, 04/2001
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/device.h>
+#include <linux/devfs_fs_kernel.h>
+#include <linux/ioctl.h>
+#include <linux/parport.h>
+#include <linux/ctype.h>
+#include <linux/poll.h>
+#include <asm/uaccess.h>
+#include <linux/ppdev.h>
+#include <linux/smp_lock.h>
+#include <linux/device.h>
+
+#define PP_VERSION "ppdev: user-space parallel port driver"
+#define CHRDEV "ppdev"
+
+struct pp_struct {
+ struct pardevice * pdev;
+ wait_queue_head_t irq_wait;
+ atomic_t irqc;
+ unsigned int flags;
+ int irqresponse;
+ unsigned char irqctl;
+ struct ieee1284_info state;
+ struct ieee1284_info saved_state;
+ long default_inactivity;
+};
+
+/* pp_struct.flags bitfields */
+#define PP_CLAIMED (1<<0)
+#define PP_EXCL (1<<1)
+
+/* Other constants */
+#define PP_INTERRUPT_TIMEOUT (10 * HZ) /* 10s */
+#define PP_BUFFER_SIZE 1024
+#define PARDEVICE_MAX 8
+
+/* ROUND_UP macro from fs/select.c */
+#define ROUND_UP(x,y) (((x)+(y)-1)/(y))
+
+static inline void pp_enable_irq (struct pp_struct *pp)
+{
+ struct parport *port = pp->pdev->port;
+ port->ops->enable_irq (port);
+}
+
+static ssize_t pp_read (struct file * file, char __user * buf, size_t count,
+ loff_t * ppos)
+{
+ unsigned int minor = iminor(file->f_dentry->d_inode);
+ struct pp_struct *pp = file->private_data;
+ char * kbuffer;
+ ssize_t bytes_read = 0;
+ struct parport *pport;
+ int mode;
+
+ if (!(pp->flags & PP_CLAIMED)) {
+ /* Don't have the port claimed */
+ printk (KERN_DEBUG CHRDEV "%x: claim the port first\n",
+ minor);
+ return -EINVAL;
+ }
+
+ /* Trivial case. */
+ if (count == 0)
+ return 0;
+
+ kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL);
+ if (!kbuffer) {
+ return -ENOMEM;
+ }
+ pport = pp->pdev->port;
+ mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR);
+
+ parport_set_timeout (pp->pdev,
+ (file->f_flags & O_NONBLOCK) ?
+ PARPORT_INACTIVITY_O_NONBLOCK :
+ pp->default_inactivity);
+
+ while (bytes_read == 0) {
+ ssize_t need = min_t(unsigned long, count, PP_BUFFER_SIZE);
+
+ if (mode == IEEE1284_MODE_EPP) {
+ /* various specials for EPP mode */
+ int flags = 0;
+ size_t (*fn)(struct parport *, void *, size_t, int);
+
+ if (pp->flags & PP_W91284PIC) {
+ flags |= PARPORT_W91284PIC;
+ }
+ if (pp->flags & PP_FASTREAD) {
+ flags |= PARPORT_EPP_FAST;
+ }
+ if (pport->ieee1284.mode & IEEE1284_ADDR) {
+ fn = pport->ops->epp_read_addr;
+ } else {
+ fn = pport->ops->epp_read_data;
+ }
+ bytes_read = (*fn)(pport, kbuffer, need, flags);
+ } else {
+ bytes_read = parport_read (pport, kbuffer, need);
+ }
+
+ if (bytes_read != 0)
+ break;
+
+ if (file->f_flags & O_NONBLOCK) {
+ bytes_read = -EAGAIN;
+ break;
+ }
+
+ if (signal_pending (current)) {
+ bytes_read = -ERESTARTSYS;
+ break;
+ }
+
+ cond_resched();
+ }
+
+ parport_set_timeout (pp->pdev, pp->default_inactivity);
+
+ if (bytes_read > 0 && copy_to_user (buf, kbuffer, bytes_read))
+ bytes_read = -EFAULT;
+
+ kfree (kbuffer);
+ pp_enable_irq (pp);
+ return bytes_read;
+}
+
+static ssize_t pp_write (struct file * file, const char __user * buf,
+ size_t count, loff_t * ppos)
+{
+ unsigned int minor = iminor(file->f_dentry->d_inode);
+ struct pp_struct *pp = file->private_data;
+ char * kbuffer;
+ ssize_t bytes_written = 0;
+ ssize_t wrote;
+ int mode;
+ struct parport *pport;
+
+ if (!(pp->flags & PP_CLAIMED)) {
+ /* Don't have the port claimed */
+ printk (KERN_DEBUG CHRDEV "%x: claim the port first\n",
+ minor);
+ return -EINVAL;
+ }
+
+ kbuffer = kmalloc(min_t(size_t, count, PP_BUFFER_SIZE), GFP_KERNEL);
+ if (!kbuffer) {
+ return -ENOMEM;
+ }
+ pport = pp->pdev->port;
+ mode = pport->ieee1284.mode & ~(IEEE1284_DEVICEID | IEEE1284_ADDR);
+
+ parport_set_timeout (pp->pdev,
+ (file->f_flags & O_NONBLOCK) ?
+ PARPORT_INACTIVITY_O_NONBLOCK :
+ pp->default_inactivity);
+
+ while (bytes_written < count) {
+ ssize_t n = min_t(unsigned long, count - bytes_written, PP_BUFFER_SIZE);
+
+ if (copy_from_user (kbuffer, buf + bytes_written, n)) {
+ bytes_written = -EFAULT;
+ break;
+ }
+
+ if ((pp->flags & PP_FASTWRITE) && (mode == IEEE1284_MODE_EPP)) {
+ /* do a fast EPP write */
+ if (pport->ieee1284.mode & IEEE1284_ADDR) {
+ wrote = pport->ops->epp_write_addr (pport,
+ kbuffer, n, PARPORT_EPP_FAST);
+ } else {
+ wrote = pport->ops->epp_write_data (pport,
+ kbuffer, n, PARPORT_EPP_FAST);
+ }
+ } else {
+ wrote = parport_write (pp->pdev->port, kbuffer, n);
+ }
+
+ if (wrote <= 0) {
+ if (!bytes_written) {
+ bytes_written = wrote;
+ }
+ break;
+ }
+
+ bytes_written += wrote;
+
+ if (file->f_flags & O_NONBLOCK) {
+ if (!bytes_written)
+ bytes_written = -EAGAIN;
+ break;
+ }
+
+ if (signal_pending (current)) {
+ if (!bytes_written) {
+ bytes_written = -EINTR;
+ }
+ break;
+ }
+
+ cond_resched();
+ }
+
+ parport_set_timeout (pp->pdev, pp->default_inactivity);
+
+ kfree (kbuffer);
+ pp_enable_irq (pp);
+ return bytes_written;
+}
+
+static void pp_irq (int irq, void * private, struct pt_regs * unused)
+{
+ struct pp_struct * pp = (struct pp_struct *) private;
+
+ if (pp->irqresponse) {
+ parport_write_control (pp->pdev->port, pp->irqctl);
+ pp->irqresponse = 0;
+ }
+
+ atomic_inc (&pp->irqc);
+ wake_up_interruptible (&pp->irq_wait);
+}
+
+static int register_device (int minor, struct pp_struct *pp)
+{
+ struct parport *port;
+ struct pardevice * pdev = NULL;
+ char *name;
+ int fl;
+
+ name = kmalloc (strlen (CHRDEV) + 3, GFP_KERNEL);
+ if (name == NULL)
+ return -ENOMEM;
+
+ sprintf (name, CHRDEV "%x", minor);
+
+ port = parport_find_number (minor);
+ if (!port) {
+ printk (KERN_WARNING "%s: no associated port!\n", name);
+ kfree (name);
+ return -ENXIO;
+ }
+
+ fl = (pp->flags & PP_EXCL) ? PARPORT_FLAG_EXCL : 0;
+ pdev = parport_register_device (port, name, NULL,
+ NULL, pp_irq, fl, pp);
+ parport_put_port (port);
+
+ if (!pdev) {
+ printk (KERN_WARNING "%s: failed to register device!\n", name);
+ kfree (name);
+ return -ENXIO;
+ }
+
+ pp->pdev = pdev;
+ printk (KERN_DEBUG "%s: registered pardevice\n", name);
+ return 0;
+}
+
+static enum ieee1284_phase init_phase (int mode)
+{
+ switch (mode & ~(IEEE1284_DEVICEID
+ | IEEE1284_ADDR)) {
+ case IEEE1284_MODE_NIBBLE:
+ case IEEE1284_MODE_BYTE:
+ return IEEE1284_PH_REV_IDLE;
+ }
+ return IEEE1284_PH_FWD_IDLE;
+}
+
+static int pp_ioctl(struct inode *inode, struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ unsigned int minor = iminor(inode);
+ struct pp_struct *pp = file->private_data;
+ struct parport * port;
+ void __user *argp = (void __user *)arg;
+
+ /* First handle the cases that don't take arguments. */
+ switch (cmd) {
+ case PPCLAIM:
+ {
+ struct ieee1284_info *info;
+ int ret;
+
+ if (pp->flags & PP_CLAIMED) {
+ printk (KERN_DEBUG CHRDEV
+ "%x: you've already got it!\n", minor);
+ return -EINVAL;
+ }
+
+ /* Deferred device registration. */
+ if (!pp->pdev) {
+ int err = register_device (minor, pp);
+ if (err) {
+ return err;
+ }
+ }
+
+ ret = parport_claim_or_block (pp->pdev);
+ if (ret < 0)
+ return ret;
+
+ pp->flags |= PP_CLAIMED;
+
+ /* For interrupt-reporting to work, we need to be
+ * informed of each interrupt. */
+ pp_enable_irq (pp);
+
+ /* We may need to fix up the state machine. */
+ info = &pp->pdev->port->ieee1284;
+ pp->saved_state.mode = info->mode;
+ pp->saved_state.phase = info->phase;
+ info->mode = pp->state.mode;
+ info->phase = pp->state.phase;
+ pp->default_inactivity = parport_set_timeout (pp->pdev, 0);
+ parport_set_timeout (pp->pdev, pp->default_inactivity);
+
+ return 0;
+ }
+ case PPEXCL:
+ if (pp->pdev) {
+ printk (KERN_DEBUG CHRDEV "%x: too late for PPEXCL; "
+ "already registered\n", minor);
+ if (pp->flags & PP_EXCL)
+ /* But it's not really an error. */
+ return 0;
+ /* There's no chance of making the driver happy. */
+ return -EINVAL;
+ }
+
+ /* Just remember to register the device exclusively
+ * when we finally do the registration. */
+ pp->flags |= PP_EXCL;
+ return 0;
+ case PPSETMODE:
+ {
+ int mode;
+ if (copy_from_user (&mode, argp, sizeof (mode)))
+ return -EFAULT;
+ /* FIXME: validate mode */
+ pp->state.mode = mode;
+ pp->state.phase = init_phase (mode);
+
+ if (pp->flags & PP_CLAIMED) {
+ pp->pdev->port->ieee1284.mode = mode;
+ pp->pdev->port->ieee1284.phase = pp->state.phase;
+ }
+
+ return 0;
+ }
+ case PPGETMODE:
+ {
+ int mode;
+
+ if (pp->flags & PP_CLAIMED) {
+ mode = pp->pdev->port->ieee1284.mode;
+ } else {
+ mode = pp->state.mode;
+ }
+ if (copy_to_user (argp, &mode, sizeof (mode))) {
+ return -EFAULT;
+ }
+ return 0;
+ }
+ case PPSETPHASE:
+ {
+ int phase;
+ if (copy_from_user (&phase, argp, sizeof (phase))) {
+ return -EFAULT;
+ }
+ /* FIXME: validate phase */
+ pp->state.phase = phase;
+
+ if (pp->flags & PP_CLAIMED) {
+ pp->pdev->port->ieee1284.phase = phase;
+ }
+
+ return 0;
+ }
+ case PPGETPHASE:
+ {
+ int phase;
+
+ if (pp->flags & PP_CLAIMED) {
+ phase = pp->pdev->port->ieee1284.phase;
+ } else {
+ phase = pp->state.phase;
+ }
+ if (copy_to_user (argp, &phase, sizeof (phase))) {
+ return -EFAULT;
+ }
+ return 0;
+ }
+ case PPGETMODES:
+ {
+ unsigned int modes;
+
+ port = parport_find_number (minor);
+ if (!port)
+ return -ENODEV;
+
+ modes = port->modes;
+ if (copy_to_user (argp, &modes, sizeof (modes))) {
+ return -EFAULT;
+ }
+ return 0;
+ }
+ case PPSETFLAGS:
+ {
+ int uflags;
+
+ if (copy_from_user (&uflags, argp, sizeof (uflags))) {
+ return -EFAULT;
+ }
+ pp->flags &= ~PP_FLAGMASK;
+ pp->flags |= (uflags & PP_FLAGMASK);
+ return 0;
+ }
+ case PPGETFLAGS:
+ {
+ int uflags;
+
+ uflags = pp->flags & PP_FLAGMASK;
+ if (copy_to_user (argp, &uflags, sizeof (uflags))) {
+ return -EFAULT;
+ }
+ return 0;
+ }
+ } /* end switch() */
+
+ /* Everything else requires the port to be claimed, so check
+ * that now. */
+ if ((pp->flags & PP_CLAIMED) == 0) {
+ printk (KERN_DEBUG CHRDEV "%x: claim the port first\n",
+ minor);
+ return -EINVAL;
+ }
+
+ port = pp->pdev->port;
+ switch (cmd) {
+ struct ieee1284_info *info;
+ unsigned char reg;
+ unsigned char mask;
+ int mode;
+ int ret;
+ struct timeval par_timeout;
+ long to_jiffies;
+
+ case PPRSTATUS:
+ reg = parport_read_status (port);
+ if (copy_to_user (argp, &reg, sizeof (reg)))
+ return -EFAULT;
+ return 0;
+ case PPRDATA:
+ reg = parport_read_data (port);
+ if (copy_to_user (argp, &reg, sizeof (reg)))
+ return -EFAULT;
+ return 0;
+ case PPRCONTROL:
+ reg = parport_read_control (port);
+ if (copy_to_user (argp, &reg, sizeof (reg)))
+ return -EFAULT;
+ return 0;
+ case PPYIELD:
+ parport_yield_blocking (pp->pdev);
+ return 0;
+
+ case PPRELEASE:
+ /* Save the state machine's state. */
+ info = &pp->pdev->port->ieee1284;
+ pp->state.mode = info->mode;
+ pp->state.phase = info->phase;
+ info->mode = pp->saved_state.mode;
+ info->phase = pp->saved_state.phase;
+ parport_release (pp->pdev);
+ pp->flags &= ~PP_CLAIMED;
+ return 0;
+
+ case PPWCONTROL:
+ if (copy_from_user (&reg, argp, sizeof (reg)))
+ return -EFAULT;
+ parport_write_control (port, reg);
+ return 0;
+
+ case PPWDATA:
+ if (copy_from_user (&reg, argp, sizeof (reg)))
+ return -EFAULT;
+ parport_write_data (port, reg);
+ return 0;
+
+ case PPFCONTROL:
+ if (copy_from_user (&mask, argp,
+ sizeof (mask)))
+ return -EFAULT;
+ if (copy_from_user (&reg, 1 + (unsigned char __user *) arg,
+ sizeof (reg)))
+ return -EFAULT;
+ parport_frob_control (port, mask, reg);
+ return 0;
+
+ case PPDATADIR:
+ if (copy_from_user (&mode, argp, sizeof (mode)))
+ return -EFAULT;
+ if (mode)
+ port->ops->data_reverse (port);
+ else
+ port->ops->data_forward (port);
+ return 0;
+
+ case PPNEGOT:
+ if (copy_from_user (&mode, argp, sizeof (mode)))
+ return -EFAULT;
+ switch ((ret = parport_negotiate (port, mode))) {
+ case 0: break;
+ case -1: /* handshake failed, peripheral not IEEE 1284 */
+ ret = -EIO;
+ break;
+ case 1: /* handshake succeeded, peripheral rejected mode */
+ ret = -ENXIO;
+ break;
+ }
+ pp_enable_irq (pp);
+ return ret;
+
+ case PPWCTLONIRQ:
+ if (copy_from_user (&reg, argp, sizeof (reg)))
+ return -EFAULT;
+
+ /* Remember what to set the control lines to, for next
+ * time we get an interrupt. */
+ pp->irqctl = reg;
+ pp->irqresponse = 1;
+ return 0;
+
+ case PPCLRIRQ:
+ ret = atomic_read (&pp->irqc);
+ if (copy_to_user (argp, &ret, sizeof (ret)))
+ return -EFAULT;
+ atomic_sub (ret, &pp->irqc);
+ return 0;
+
+ case PPSETTIME:
+ if (copy_from_user (&par_timeout, argp, sizeof(struct timeval))) {
+ return -EFAULT;
+ }
+ /* Convert to jiffies, place in pp->pdev->timeout */
+ 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;
+ }
+ pp->pdev->timeout = to_jiffies;
+ return 0;
+
+ case PPGETTIME:
+ to_jiffies = pp->pdev->timeout;
+ par_timeout.tv_sec = to_jiffies / HZ;
+ par_timeout.tv_usec = (to_jiffies % (long)HZ) * (1000000/HZ);
+ if (copy_to_user (argp, &par_timeout, sizeof(struct timeval)))
+ return -EFAULT;
+ return 0;
+
+ default:
+ printk (KERN_DEBUG CHRDEV "%x: What? (cmd=0x%x)\n", minor,
+ cmd);
+ return -EINVAL;
+ }
+
+ /* Keep the compiler happy */
+ return 0;
+}
+
+static int pp_open (struct inode * inode, struct file * file)
+{
+ unsigned int minor = iminor(inode);
+ struct pp_struct *pp;
+
+ if (minor >= PARPORT_MAX)
+ return -ENXIO;
+
+ pp = kmalloc (sizeof (struct pp_struct), GFP_KERNEL);
+ if (!pp)
+ return -ENOMEM;
+
+ pp->state.mode = IEEE1284_MODE_COMPAT;
+ pp->state.phase = init_phase (pp->state.mode);
+ pp->flags = 0;
+ pp->irqresponse = 0;
+ atomic_set (&pp->irqc, 0);
+ init_waitqueue_head (&pp->irq_wait);
+
+ /* Defer the actual device registration until the first claim.
+ * That way, we know whether or not the driver wants to have
+ * exclusive access to the port (PPEXCL).
+ */
+ pp->pdev = NULL;
+ file->private_data = pp;
+
+ return 0;
+}
+
+static int pp_release (struct inode * inode, struct file * file)
+{
+ unsigned int minor = iminor(inode);
+ struct pp_struct *pp = file->private_data;
+ int compat_negot;
+
+ compat_negot = 0;
+ if (!(pp->flags & PP_CLAIMED) && pp->pdev &&
+ (pp->state.mode != IEEE1284_MODE_COMPAT)) {
+ struct ieee1284_info *info;
+
+ /* parport released, but not in compatibility mode */
+ parport_claim_or_block (pp->pdev);
+ pp->flags |= PP_CLAIMED;
+ info = &pp->pdev->port->ieee1284;
+ pp->saved_state.mode = info->mode;
+ pp->saved_state.phase = info->phase;
+ info->mode = pp->state.mode;
+ info->phase = pp->state.phase;
+ compat_negot = 1;
+ } else if ((pp->flags & PP_CLAIMED) && pp->pdev &&
+ (pp->pdev->port->ieee1284.mode != IEEE1284_MODE_COMPAT)) {
+ compat_negot = 2;
+ }
+ if (compat_negot) {
+ parport_negotiate (pp->pdev->port, IEEE1284_MODE_COMPAT);
+ printk (KERN_DEBUG CHRDEV
+ "%x: negotiated back to compatibility mode because "
+ "user-space forgot\n", minor);
+ }
+
+ if (pp->flags & PP_CLAIMED) {
+ struct ieee1284_info *info;
+
+ info = &pp->pdev->port->ieee1284;
+ pp->state.mode = info->mode;
+ pp->state.phase = info->phase;
+ info->mode = pp->saved_state.mode;
+ info->phase = pp->saved_state.phase;
+ parport_release (pp->pdev);
+ if (compat_negot != 1) {
+ printk (KERN_DEBUG CHRDEV "%x: released pardevice "
+ "because user-space forgot\n", minor);
+ }
+ }
+
+ if (pp->pdev) {
+ const char *name = pp->pdev->name;
+ parport_unregister_device (pp->pdev);
+ kfree (name);
+ pp->pdev = NULL;
+ printk (KERN_DEBUG CHRDEV "%x: unregistered pardevice\n",
+ minor);
+ }
+
+ kfree (pp);
+
+ return 0;
+}
+
+/* No kernel lock held - fine */
+static unsigned int pp_poll (struct file * file, poll_table * wait)
+{
+ struct pp_struct *pp = file->private_data;
+ unsigned int mask = 0;
+
+ poll_wait (file, &pp->irq_wait, wait);
+ if (atomic_read (&pp->irqc))
+ mask |= POLLIN | POLLRDNORM;
+
+ return mask;
+}
+
+static struct class_simple *ppdev_class;
+
+static struct file_operations pp_fops = {
+ .owner = THIS_MODULE,
+ .llseek = no_llseek,
+ .read = pp_read,
+ .write = pp_write,
+ .poll = pp_poll,
+ .ioctl = pp_ioctl,
+ .open = pp_open,
+ .release = pp_release,
+};
+
+static void pp_attach(struct parport *port)
+{
+ class_simple_device_add(ppdev_class, MKDEV(PP_MAJOR, port->number),
+ NULL, "parport%d", port->number);
+}
+
+static void pp_detach(struct parport *port)
+{
+ class_simple_device_remove(MKDEV(PP_MAJOR, port->number));
+}
+
+static struct parport_driver pp_driver = {
+ .name = CHRDEV,
+ .attach = pp_attach,
+ .detach = pp_detach,
+};
+
+static int __init ppdev_init (void)
+{
+ int i, err = 0;
+
+ if (register_chrdev (PP_MAJOR, CHRDEV, &pp_fops)) {
+ printk (KERN_WARNING CHRDEV ": unable to get major %d\n",
+ PP_MAJOR);
+ return -EIO;
+ }
+ ppdev_class = class_simple_create(THIS_MODULE, CHRDEV);
+ if (IS_ERR(ppdev_class)) {
+ err = PTR_ERR(ppdev_class);
+ goto out_chrdev;
+ }
+ devfs_mk_dir("parports");
+ for (i = 0; i < PARPORT_MAX; i++) {
+ devfs_mk_cdev(MKDEV(PP_MAJOR, i),
+ S_IFCHR | S_IRUGO | S_IWUGO, "parports/%d", i);
+ }
+ if (parport_register_driver(&pp_driver)) {
+ printk (KERN_WARNING CHRDEV ": unable to register with parport\n");
+ goto out_class;
+ }
+
+ printk (KERN_INFO PP_VERSION "\n");
+ goto out;
+
+out_class:
+ for (i = 0; i < PARPORT_MAX; i++)
+ devfs_remove("parports/%d", i);
+ devfs_remove("parports");
+ class_simple_destroy(ppdev_class);
+out_chrdev:
+ unregister_chrdev(PP_MAJOR, CHRDEV);
+out:
+ return err;
+}
+
+static void __exit ppdev_cleanup (void)
+{
+ int i;
+ /* Clean up all parport stuff */
+ for (i = 0; i < PARPORT_MAX; i++)
+ devfs_remove("parports/%d", i);
+ parport_unregister_driver(&pp_driver);
+ devfs_remove("parports");
+ class_simple_destroy(ppdev_class);
+ unregister_chrdev (PP_MAJOR, CHRDEV);
+}
+
+module_init(ppdev_init);
+module_exit(ppdev_cleanup);
+
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_CHARDEV_MAJOR(PP_MAJOR);
generated by cgit v1.2.3 (git 2.0.4) at 2024-11-02 19:34:52 +0000