[PATCH] pcmcia: move PCMCIA ioctl to a separate file

Move all PCMCIA_IOCTL-related code to a different file.

Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>

From: Richard Purdie <rpurdie@rpsys.net>

The pcmcia-move-pcmcia-ioctl-to-a-separate-file patch was corrupted in -mm2
causing this problem.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 779 insertions, 0 deletions

diff --git a/drivers/pcmcia/pcmcia_ioctl.c b/drivers/pcmcia/pcmcia_ioctl.c
new file mode 100644
index 000000000000..e8d2c95db1c9
--- /dev/null
+++ b/drivers/pcmcia/pcmcia_ioctl.c
@@ -0,0 +1,779 @@
+/*
+ * pcmcia_ioctl.c -- ioctl interface for cardmgr and cardctl
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * The initial developer of the original code is David A. Hinds
+ * <dahinds@users.sourceforge.net>.  Portions created by David A. Hinds
+ * are Copyright (C) 1999 David A. Hinds.  All Rights Reserved.
+ *
+ * (C) 1999		David A. Hinds
+ * (C) 2003 - 2004	Dominik Brodowski
+ */
+
+/*
+ * This file will go away soon.
+ */
+
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/major.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <linux/fcntl.h>
+#include <linux/sched.h>
+#include <linux/smp_lock.h>
+#include <linux/timer.h>
+#include <linux/ioctl.h>
+#include <linux/proc_fs.h>
+#include <linux/poll.h>
+#include <linux/pci.h>
+#include <linux/list.h>
+#include <linux/delay.h>
+#include <linux/kref.h>
+#include <linux/workqueue.h>
+#include <linux/crc32.h>
+
+#include <asm/atomic.h>
+
+#define IN_CARD_SERVICES
+#include <pcmcia/version.h>
+#include <pcmcia/cs_types.h>
+#include <pcmcia/cs.h>
+#include <pcmcia/bulkmem.h>
+#include <pcmcia/cistpl.h>
+#include <pcmcia/ds.h>
+#include <pcmcia/ss.h>
+
+#include "cs_internal.h"
+#include "ds_internal.h"
+
+static int major_dev = -1;
+
+
+/* Device user information */
+#define MAX_EVENTS	32
+#define USER_MAGIC	0x7ea4
+#define CHECK_USER(u) \
+    (((u) == NULL) || ((u)->user_magic != USER_MAGIC))
+
+typedef struct user_info_t {
+	u_int			user_magic;
+	int			event_head, event_tail;
+	event_t			event[MAX_EVENTS];
+	struct user_info_t	*next;
+	struct pcmcia_bus_socket *socket;
+} user_info_t;
+
+
+#ifdef DEBUG
+extern int ds_pc_debug;
+#define cs_socket_name(skt)    ((skt)->dev.class_id)
+
+#define ds_dbg(lvl, fmt, arg...) do {		\
+	if (ds_pc_debug >= lvl)				\
+		printk(KERN_DEBUG "ds: " fmt , ## arg);		\
+} while (0)
+#else
+#define ds_dbg(lvl, fmt, arg...) do { } while (0)
+#endif
+
+
+static struct pcmcia_bus_socket * get_socket_info_by_nr(unsigned int nr)
+{
+	struct pcmcia_socket * s = pcmcia_get_socket_by_nr(nr);
+	if (s && s->pcmcia)
+		return s->pcmcia;
+	else
+		return NULL;
+}
+
+/* backwards-compatible accessing of driver --- by name! */
+
+static struct pcmcia_driver * get_pcmcia_driver (dev_info_t *dev_info)
+{
+	struct device_driver *drv;
+	struct pcmcia_driver *p_drv;
+
+	drv = driver_find((char *) dev_info, &pcmcia_bus_type);
+	if (!drv)
+		return NULL;
+
+	p_drv = container_of(drv, struct pcmcia_driver, drv);
+
+	return (p_drv);
+}
+
+
+#ifdef CONFIG_PROC_FS
+static struct proc_dir_entry *proc_pccard = NULL;
+
+static int proc_read_drivers_callback(struct device_driver *driver, void *d)
+{
+	char **p = d;
+	struct pcmcia_driver *p_drv = container_of(driver,
+						   struct pcmcia_driver, drv);
+
+	*p += sprintf(*p, "%-24.24s 1 %d\n", p_drv->drv.name,
+#ifdef CONFIG_MODULE_UNLOAD
+		      (p_drv->owner) ? module_refcount(p_drv->owner) : 1
+#else
+		      1
+#endif
+	);
+	d = (void *) p;
+
+	return 0;
+}
+
+static int proc_read_drivers(char *buf, char **start, off_t pos,
+			     int count, int *eof, void *data)
+{
+	char *p = buf;
+
+	bus_for_each_drv(&pcmcia_bus_type, NULL,
+			 (void *) &p, proc_read_drivers_callback);
+
+	return (p - buf);
+}
+#endif
+
+/*======================================================================
+
+    These manage a ring buffer of events pending for one user process
+
+======================================================================*/
+
+
+static int queue_empty(user_info_t *user)
+{
+    return (user->event_head == user->event_tail);
+}
+
+static event_t get_queued_event(user_info_t *user)
+{
+    user->event_tail = (user->event_tail+1) % MAX_EVENTS;
+    return user->event[user->event_tail];
+}
+
+static void queue_event(user_info_t *user, event_t event)
+{
+    user->event_head = (user->event_head+1) % MAX_EVENTS;
+    if (user->event_head == user->event_tail)
+	user->event_tail = (user->event_tail+1) % MAX_EVENTS;
+    user->event[user->event_head] = event;
+}
+
+void handle_event(struct pcmcia_bus_socket *s, event_t event)
+{
+    user_info_t *user;
+    for (user = s->user; user; user = user->next)
+	queue_event(user, event);
+    wake_up_interruptible(&s->queue);
+}
+
+
+/*======================================================================
+
+    bind_request() and bind_device() are merged by now. Register_client()
+    is called right at the end of bind_request(), during the driver's
+    ->attach() call. Individual descriptions:
+
+    bind_request() connects a socket to a particular client driver.
+    It looks up the specified device ID in the list of registered
+    drivers, binds it to the socket, and tries to create an instance
+    of the device.  unbind_request() deletes a driver instance.
+
+    Bind_device() associates a device driver with a particular socket.
+    It is normally called by Driver Services after it has identified
+    a newly inserted card.  An instance of that driver will then be
+    eligible to register as a client of this socket.
+
+    Register_client() uses the dev_info_t handle to match the
+    caller with a socket.  The driver must have already been bound
+    to a socket with bind_device() -- in fact, bind_device()
+    allocates the client structure that will be used.
+
+======================================================================*/
+
+static int bind_request(struct pcmcia_bus_socket *s, bind_info_t *bind_info)
+{
+	struct pcmcia_driver *p_drv;
+	struct pcmcia_device *p_dev;
+	int ret = 0;
+	unsigned long flags;
+
+	s = pcmcia_get_bus_socket(s);
+	if (!s)
+		return -EINVAL;
+
+	ds_dbg(2, "bind_request(%d, '%s')\n", s->parent->sock,
+	       (char *)bind_info->dev_info);
+
+	p_drv = get_pcmcia_driver(&bind_info->dev_info);
+	if (!p_drv) {
+		ret = -EINVAL;
+		goto err_put;
+	}
+
+	if (!try_module_get(p_drv->owner)) {
+		ret = -EINVAL;
+		goto err_put_driver;
+	}
+
+	spin_lock_irqsave(&pcmcia_dev_list_lock, flags);
+        list_for_each_entry(p_dev, &s->devices_list, socket_device_list) {
+		if (p_dev->func == bind_info->function) {
+			if ((p_dev->dev.driver == &p_drv->drv)) {
+				if (p_dev->cardmgr) {
+					/* if there's already a device
+					 * registered, and it was registered
+					 * by userspace before, we need to
+					 * return the "instance". */
+					spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
+					bind_info->instance = p_dev->instance;
+					ret = -EBUSY;
+					goto err_put_module;
+				} else {
+					/* the correct driver managed to bind
+					 * itself magically to the correct
+					 * device. */
+					spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
+					p_dev->cardmgr = p_drv;
+					ret = 0;
+					goto err_put_module;
+				}
+			} else if (!p_dev->dev.driver) {
+				/* there's already a device available where
+				 * no device has been bound to yet. So we don't
+				 * need to register a device! */
+				spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
+				goto rescan;
+			}
+		}
+	}
+	spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
+
+	p_dev = pcmcia_device_add(s, bind_info->function);
+	if (!p_dev) {
+		ret = -EIO;
+		goto err_put_module;
+	}
+
+rescan:
+	p_dev->cardmgr = p_drv;
+
+	/* if a driver is already running, we can abort */
+	if (p_dev->dev.driver)
+		goto err_put_module;
+
+	/*
+	 * Prevent this racing with a card insertion.
+	 */
+	down(&s->parent->skt_sem);
+	bus_rescan_devices(&pcmcia_bus_type);
+	up(&s->parent->skt_sem);
+
+	/* check whether the driver indeed matched. I don't care if this
+	 * is racy or not, because it can only happen on cardmgr access
+	 * paths...
+	 */
+	if (!(p_dev->dev.driver == &p_drv->drv))
+		p_dev->cardmgr = NULL;
+
+ err_put_module:
+	module_put(p_drv->owner);
+ err_put_driver:
+	put_driver(&p_drv->drv);
+ err_put:
+	pcmcia_put_bus_socket(s);
+
+	return (ret);
+} /* bind_request */
+
+
+extern struct pci_bus *pcmcia_lookup_bus(struct pcmcia_socket *s);
+
+static int get_device_info(struct pcmcia_bus_socket *s, bind_info_t *bind_info, int first)
+{
+	dev_node_t *node;
+	struct pcmcia_device *p_dev;
+	unsigned long flags;
+	int ret = 0;
+
+#ifdef CONFIG_CARDBUS
+	/*
+	 * Some unbelievably ugly code to associate the PCI cardbus
+	 * device and its driver with the PCMCIA "bind" information.
+	 */
+	{
+		struct pci_bus *bus;
+
+		bus = pcmcia_lookup_bus(s->parent);
+		if (bus) {
+			struct list_head *list;
+			struct pci_dev *dev = NULL;
+
+			list = bus->devices.next;
+			while (list != &bus->devices) {
+				struct pci_dev *pdev = pci_dev_b(list);
+				list = list->next;
+
+				if (first) {
+					dev = pdev;
+					break;
+				}
+
+				/* Try to handle "next" here some way? */
+			}
+			if (dev && dev->driver) {
+				strlcpy(bind_info->name, dev->driver->name, DEV_NAME_LEN);
+				bind_info->major = 0;
+				bind_info->minor = 0;
+				bind_info->next = NULL;
+				return 0;
+			}
+		}
+	}
+#endif
+
+	spin_lock_irqsave(&pcmcia_dev_list_lock, flags);
+	list_for_each_entry(p_dev, &s->devices_list, socket_device_list) {
+		if (p_dev->func == bind_info->function) {
+			p_dev = pcmcia_get_dev(p_dev);
+			if (!p_dev)
+				continue;
+			goto found;
+		}
+	}
+	spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
+	return -ENODEV;
+
+ found:
+	spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
+
+	if ((!p_dev->instance) ||
+	    (p_dev->instance->state & DEV_CONFIG_PENDING)) {
+		ret = -EAGAIN;
+		goto err_put;
+	}
+
+	if (first)
+		node = p_dev->instance->dev;
+	else
+		for (node = p_dev->instance->dev; node; node = node->next)
+			if (node == bind_info->next)
+				break;
+	if (!node) {
+		ret = -ENODEV;
+		goto err_put;
+	}
+
+	strlcpy(bind_info->name, node->dev_name, DEV_NAME_LEN);
+	bind_info->major = node->major;
+	bind_info->minor = node->minor;
+	bind_info->next = node->next;
+
+ err_put:
+	pcmcia_put_dev(p_dev);
+	return (ret);
+} /* get_device_info */
+
+
+static int ds_open(struct inode *inode, struct file *file)
+{
+    socket_t i = iminor(inode);
+    struct pcmcia_bus_socket *s;
+    user_info_t *user;
+
+    ds_dbg(0, "ds_open(socket %d)\n", i);
+
+    s = get_socket_info_by_nr(i);
+    if (!s)
+	    return -ENODEV;
+    s = pcmcia_get_bus_socket(s);
+    if (!s)
+	    return -ENODEV;
+
+    if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
+	    if (s->state & DS_SOCKET_BUSY) {
+		    pcmcia_put_bus_socket(s);
+		    return -EBUSY;
+	    }
+	else
+	    s->state |= DS_SOCKET_BUSY;
+    }
+
+    user = kmalloc(sizeof(user_info_t), GFP_KERNEL);
+    if (!user) {
+	    pcmcia_put_bus_socket(s);
+	    return -ENOMEM;
+    }
+    user->event_tail = user->event_head = 0;
+    user->next = s->user;
+    user->user_magic = USER_MAGIC;
+    user->socket = s;
+    s->user = user;
+    file->private_data = user;
+
+    if (s->state & DS_SOCKET_PRESENT)
+	queue_event(user, CS_EVENT_CARD_INSERTION);
+    return 0;
+} /* ds_open */
+
+/*====================================================================*/
+
+static int ds_release(struct inode *inode, struct file *file)
+{
+    struct pcmcia_bus_socket *s;
+    user_info_t *user, **link;
+
+    ds_dbg(0, "ds_release(socket %d)\n", iminor(inode));
+
+    user = file->private_data;
+    if (CHECK_USER(user))
+	goto out;
+
+    s = user->socket;
+
+    /* Unlink user data structure */
+    if ((file->f_flags & O_ACCMODE) != O_RDONLY) {
+	s->state &= ~DS_SOCKET_BUSY;
+    }
+    file->private_data = NULL;
+    for (link = &s->user; *link; link = &(*link)->next)
+	if (*link == user) break;
+    if (link == NULL)
+	goto out;
+    *link = user->next;
+    user->user_magic = 0;
+    kfree(user);
+    pcmcia_put_bus_socket(s);
+out:
+    return 0;
+} /* ds_release */
+
+/*====================================================================*/
+
+static ssize_t ds_read(struct file *file, char __user *buf,
+		       size_t count, loff_t *ppos)
+{
+    struct pcmcia_bus_socket *s;
+    user_info_t *user;
+    int ret;
+
+    ds_dbg(2, "ds_read(socket %d)\n", iminor(file->f_dentry->d_inode));
+
+    if (count < 4)
+	return -EINVAL;
+
+    user = file->private_data;
+    if (CHECK_USER(user))
+	return -EIO;
+
+    s = user->socket;
+    if (s->state & DS_SOCKET_DEAD)
+        return -EIO;
+
+    ret = wait_event_interruptible(s->queue, !queue_empty(user));
+    if (ret == 0)
+	ret = put_user(get_queued_event(user), (int __user *)buf) ? -EFAULT : 4;
+
+    return ret;
+} /* ds_read */
+
+/*====================================================================*/
+
+static ssize_t ds_write(struct file *file, const char __user *buf,
+			size_t count, loff_t *ppos)
+{
+    ds_dbg(2, "ds_write(socket %d)\n", iminor(file->f_dentry->d_inode));
+
+    if (count != 4)
+	return -EINVAL;
+    if ((file->f_flags & O_ACCMODE) == O_RDONLY)
+	return -EBADF;
+
+    return -EIO;
+} /* ds_write */
+
+/*====================================================================*/
+
+/* No kernel lock - fine */
+static u_int ds_poll(struct file *file, poll_table *wait)
+{
+    struct pcmcia_bus_socket *s;
+    user_info_t *user;
+
+    ds_dbg(2, "ds_poll(socket %d)\n", iminor(file->f_dentry->d_inode));
+
+    user = file->private_data;
+    if (CHECK_USER(user))
+	return POLLERR;
+    s = user->socket;
+    /*
+     * We don't check for a dead socket here since that
+     * will send cardmgr into an endless spin.
+     */
+    poll_wait(file, &s->queue, wait);
+    if (!queue_empty(user))
+	return POLLIN | POLLRDNORM;
+    return 0;
+} /* ds_poll */
+
+/*====================================================================*/
+
+extern int pcmcia_adjust_resource_info(adjust_t *adj);
+
+static int ds_ioctl(struct inode * inode, struct file * file,
+		    u_int cmd, u_long arg)
+{
+    struct pcmcia_bus_socket *s;
+    void __user *uarg = (char __user *)arg;
+    u_int size;
+    int ret, err;
+    ds_ioctl_arg_t *buf;
+    user_info_t *user;
+
+    ds_dbg(2, "ds_ioctl(socket %d, %#x, %#lx)\n", iminor(inode), cmd, arg);
+
+    user = file->private_data;
+    if (CHECK_USER(user))
+	return -EIO;
+
+    s = user->socket;
+    if (s->state & DS_SOCKET_DEAD)
+        return -EIO;
+
+    size = (cmd & IOCSIZE_MASK) >> IOCSIZE_SHIFT;
+    if (size > sizeof(ds_ioctl_arg_t)) return -EINVAL;
+
+    /* Permission check */
+    if (!(cmd & IOC_OUT) && !capable(CAP_SYS_ADMIN))
+	return -EPERM;
+
+    if (cmd & IOC_IN) {
+	if (!access_ok(VERIFY_READ, uarg, size)) {
+	    ds_dbg(3, "ds_ioctl(): verify_read = %d\n", -EFAULT);
+	    return -EFAULT;
+	}
+    }
+    if (cmd & IOC_OUT) {
+	if (!access_ok(VERIFY_WRITE, uarg, size)) {
+	    ds_dbg(3, "ds_ioctl(): verify_write = %d\n", -EFAULT);
+	    return -EFAULT;
+	}
+    }
+    buf = kmalloc(sizeof(ds_ioctl_arg_t), GFP_KERNEL);
+    if (!buf)
+	return -ENOMEM;
+
+    err = ret = 0;
+
+    if (cmd & IOC_IN) __copy_from_user((char *)buf, uarg, size);
+
+    switch (cmd) {
+    case DS_ADJUST_RESOURCE_INFO:
+	ret = pcmcia_adjust_resource_info(&buf->adjust);
+	break;
+    case DS_GET_CARD_SERVICES_INFO:
+	ret = pcmcia_get_card_services_info(&buf->servinfo);
+	break;
+    case DS_GET_CONFIGURATION_INFO:
+	if (buf->config.Function &&
+	   (buf->config.Function >= s->parent->functions))
+	    ret = CS_BAD_ARGS;
+	else
+	    ret = pccard_get_configuration_info(s->parent,
+			buf->config.Function, &buf->config);
+	break;
+    case DS_GET_FIRST_TUPLE:
+	down(&s->parent->skt_sem);
+	pcmcia_validate_mem(s->parent);
+	up(&s->parent->skt_sem);
+	ret = pccard_get_first_tuple(s->parent, BIND_FN_ALL, &buf->tuple);
+	break;
+    case DS_GET_NEXT_TUPLE:
+	ret = pccard_get_next_tuple(s->parent, BIND_FN_ALL, &buf->tuple);
+	break;
+    case DS_GET_TUPLE_DATA:
+	buf->tuple.TupleData = buf->tuple_parse.data;
+	buf->tuple.TupleDataMax = sizeof(buf->tuple_parse.data);
+	ret = pccard_get_tuple_data(s->parent, &buf->tuple);
+	break;
+    case DS_PARSE_TUPLE:
+	buf->tuple.TupleData = buf->tuple_parse.data;
+	ret = pccard_parse_tuple(&buf->tuple, &buf->tuple_parse.parse);
+	break;
+    case DS_RESET_CARD:
+	ret = pccard_reset_card(s->parent);
+	break;
+    case DS_GET_STATUS:
+	if (buf->status.Function &&
+	   (buf->status.Function >= s->parent->functions))
+	    ret = CS_BAD_ARGS;
+	else
+	ret = pccard_get_status(s->parent, buf->status.Function, &buf->status);
+	break;
+    case DS_VALIDATE_CIS:
+	down(&s->parent->skt_sem);
+	pcmcia_validate_mem(s->parent);
+	up(&s->parent->skt_sem);
+	ret = pccard_validate_cis(s->parent, BIND_FN_ALL, &buf->cisinfo);
+	break;
+    case DS_SUSPEND_CARD:
+	ret = pcmcia_suspend_card(s->parent);
+	break;
+    case DS_RESUME_CARD:
+	ret = pcmcia_resume_card(s->parent);
+	break;
+    case DS_EJECT_CARD:
+	err = pcmcia_eject_card(s->parent);
+	break;
+    case DS_INSERT_CARD:
+	err = pcmcia_insert_card(s->parent);
+	break;
+    case DS_ACCESS_CONFIGURATION_REGISTER:
+	if ((buf->conf_reg.Action == CS_WRITE) && !capable(CAP_SYS_ADMIN)) {
+	    err = -EPERM;
+	    goto free_out;
+	}
+	if (buf->conf_reg.Function &&
+	   (buf->conf_reg.Function >= s->parent->functions))
+	    ret = CS_BAD_ARGS;
+	else
+	    ret = pccard_access_configuration_register(s->parent,
+			buf->conf_reg.Function, &buf->conf_reg);
+	break;
+    case DS_GET_FIRST_REGION:
+    case DS_GET_NEXT_REGION:
+    case DS_BIND_MTD:
+	if (!capable(CAP_SYS_ADMIN)) {
+		err = -EPERM;
+		goto free_out;
+	} else {
+		static int printed = 0;
+		if (!printed) {
+			printk(KERN_WARNING "2.6. kernels use pcmciamtd instead of memory_cs.c and do not require special\n");
+			printk(KERN_WARNING "MTD handling any more.\n");
+			printed++;
+		}
+	}
+	err = -EINVAL;
+	goto free_out;
+	break;
+    case DS_GET_FIRST_WINDOW:
+	ret = pcmcia_get_window(s->parent, &buf->win_info.handle, 0,
+			&buf->win_info.window);
+	break;
+    case DS_GET_NEXT_WINDOW:
+	ret = pcmcia_get_window(s->parent, &buf->win_info.handle,
+			buf->win_info.handle->index + 1, &buf->win_info.window);
+	break;
+    case DS_GET_MEM_PAGE:
+	ret = pcmcia_get_mem_page(buf->win_info.handle,
+			   &buf->win_info.map);
+	break;
+    case DS_REPLACE_CIS:
+	ret = pcmcia_replace_cis(s->parent, &buf->cisdump);
+	break;
+    case DS_BIND_REQUEST:
+	if (!capable(CAP_SYS_ADMIN)) {
+		err = -EPERM;
+		goto free_out;
+	}
+	err = bind_request(s, &buf->bind_info);
+	break;
+    case DS_GET_DEVICE_INFO:
+	err = get_device_info(s, &buf->bind_info, 1);
+	break;
+    case DS_GET_NEXT_DEVICE:
+	err = get_device_info(s, &buf->bind_info, 0);
+	break;
+    case DS_UNBIND_REQUEST:
+	err = 0;
+	break;
+    default:
+	err = -EINVAL;
+    }
+
+    if ((err == 0) && (ret != CS_SUCCESS)) {
+	ds_dbg(2, "ds_ioctl: ret = %d\n", ret);
+	switch (ret) {
+	case CS_BAD_SOCKET: case CS_NO_CARD:
+	    err = -ENODEV; break;
+	case CS_BAD_ARGS: case CS_BAD_ATTRIBUTE: case CS_BAD_IRQ:
+	case CS_BAD_TUPLE:
+	    err = -EINVAL; break;
+	case CS_IN_USE:
+	    err = -EBUSY; break;
+	case CS_OUT_OF_RESOURCE:
+	    err = -ENOSPC; break;
+	case CS_NO_MORE_ITEMS:
+	    err = -ENODATA; break;
+	case CS_UNSUPPORTED_FUNCTION:
+	    err = -ENOSYS; break;
+	default:
+	    err = -EIO; break;
+	}
+    }
+
+    if (cmd & IOC_OUT) {
+        if (__copy_to_user(uarg, (char *)buf, size))
+            err = -EFAULT;
+    }
+
+free_out:
+    kfree(buf);
+    return err;
+} /* ds_ioctl */
+
+/*====================================================================*/
+
+static struct file_operations ds_fops = {
+	.owner		= THIS_MODULE,
+	.open		= ds_open,
+	.release	= ds_release,
+	.ioctl		= ds_ioctl,
+	.read		= ds_read,
+	.write		= ds_write,
+	.poll		= ds_poll,
+};
+
+void __init pcmcia_setup_ioctl(void) {
+	int i;
+
+	/* Set up character device for user mode clients */
+	i = register_chrdev(0, "pcmcia", &ds_fops);
+	if (i == -EBUSY)
+		printk(KERN_NOTICE "unable to find a free device # for "
+		       "Driver Services\n");
+	else
+		major_dev = i;
+
+#ifdef CONFIG_PROC_FS
+	proc_pccard = proc_mkdir("pccard", proc_bus);
+	if (proc_pccard)
+		create_proc_read_entry("drivers",0,proc_pccard,proc_read_drivers,NULL);
+#endif
+}
+
+
+void __exit pcmcia_cleanup_ioctl(void) {
+#ifdef CONFIG_PROC_FS
+	if (proc_pccard) {
+		remove_proc_entry("drivers", proc_pccard);
+		remove_proc_entry("pccard", proc_bus);
+	}
+#endif
+	if (major_dev != -1)
+		unregister_chrdev(major_dev, "pcmcia");
+}