diff options
Diffstat (limited to 'drivers/usb/drivers.c')
| -rw-r--r-- | drivers/usb/drivers.c | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/drivers/usb/drivers.c b/drivers/usb/drivers.c new file mode 100644 index 000000000..454130006 --- /dev/null +++ b/drivers/usb/drivers.c @@ -0,0 +1,126 @@ +/* + * 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 <asm/uaccess.h> + +#include "usb.h" +#include "usbdevice_fs.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); + start += sprintf (start, "%s\n", 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 long long usb_driver_lseek(struct file * file, long long 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 = { + usb_driver_lseek, /* lseek */ + usb_driver_read, /* read */ + NULL, /* write */ + NULL, /* readdir */ + NULL, /* poll */ + NULL, /* ioctl */ + NULL, /* mmap */ + NULL, /* open */ + NULL, /* flush */ + NULL, /* release */ + NULL /* fsync */ +}; |