/* * 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,};