patch-2.2.18 linux/drivers/usb/drivers.c

• Lines: 120
• Date: Fri Sep 1 13:51:29 2000
• Orig file: v2.2.17/drivers/usb/drivers.c
• Orig date: Thu Jan 1 01:00:00 1970

diff -u --new-file --recursive --exclude-from /usr/src/exclude v2.2.17/drivers/usb/drivers.c linux/drivers/usb/drivers.c
@@ -0,0 +1,119 @@
+/*
+ * drivers.c
+ * (C) Copyright 1999 Randy Dunlap.
+ * (C) Copyright 1999, 2000 Thomas Sailer <sailer@ife.ee.ethz.ch>. (proc file per device)
+ * (C) Copyright 1999 Deti Fliegl (new USB architecture)
+ *
+ * $id$
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ *************************************************************
+ *
+ * 1999-12-16: Thomas Sailer <sailer@ife.ee.ethz.ch>
+ *   Converted the whole proc stuff to real
+ *   read methods. Now not the whole device list needs to fit
+ *   into one page, only the device list for one bus.
+ *   Added a poll method to /proc/bus/usb/devices, to wake
+ *   up an eventual usbd
+ * 2000-01-04: Thomas Sailer <sailer@ife.ee.ethz.ch>
+ *   Turned into its own filesystem
+ *
+ * $Id: drivers.c,v 1.3 2000/01/11 13:58:24 tom Exp $
+ */
+
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/usb.h>
+#include <linux/usbdevice_fs.h>
+#include <asm/uaccess.h>
+
+/*****************************************************************/
+
+/*
+ * Dump usb_driver_list.
+ *
+ * We now walk the list of registered USB drivers.
+ */
+static ssize_t usb_driver_read(struct file *file, char *buf, size_t nbytes, loff_t *ppos)
+{
+	struct list_head *tmp = usb_driver_list.next;
+	char *page, *start, *end;
+	ssize_t ret = 0;
+	unsigned int pos, len;
+
+	if (*ppos < 0)
+		return -EINVAL;
+	if (nbytes <= 0)
+		return 0;
+	if (!access_ok(VERIFY_WRITE, buf, nbytes))
+		return -EFAULT;
+        if (!(page = (char*) __get_free_page(GFP_KERNEL)))
+                return -ENOMEM;
+	start = page;
+	end = page + (PAGE_SIZE - 100);
+	pos = *ppos;
+	for (; tmp != &usb_driver_list; tmp = tmp->next) {
+		struct usb_driver *driver = list_entry(tmp, struct usb_driver, driver_list);
+		int minor = driver->fops ? driver->minor : -1;
+		if (minor == -1)
+			start += sprintf (start, "         %s\n", driver->name);
+		else
+			start += sprintf (start, "%3d-%3d: %s\n", minor, minor + 15, driver->name);
+		if (start > end) {
+			start += sprintf(start, "(truncated)\n");
+			break;
+		}
+	}
+	if (start == page)
+		start += sprintf(start, "(none)\n");
+	len = start - page;
+	if (len > pos) {
+		len -= pos;
+		if (len > nbytes)
+			len = nbytes;
+		ret = len;
+		if (copy_to_user(buf, page + pos, len))
+			ret = -EFAULT;
+		else
+			*ppos += len;
+	}
+	free_page((unsigned long)page);
+	return ret;
+}
+
+static loff_t usb_driver_lseek(struct file * file, loff_t offset, int orig)
+{
+	switch (orig) {
+	case 0:
+		file->f_pos = offset;
+		return file->f_pos;
+
+	case 1:
+		file->f_pos += offset;
+		return file->f_pos;
+
+	case 2:
+		return -EINVAL;
+
+	default:
+		return -EINVAL;
+	}
+}
+
+struct file_operations usbdevfs_drivers_fops = {
+	llseek:		usb_driver_lseek,
+	read:		usb_driver_read,
+};