devio.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:30k
- /*****************************************************************************/
- /*
- * devio.c -- User space communication with USB devices.
- *
- * Copyright (C) 1999-2000 Thomas Sailer (sailer@ife.ee.ethz.ch)
- *
- * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
- *
- * $Id: devio.c,v 1.7 2000/02/01 17:28:48 fliegl Exp $
- *
- * This file implements the usbdevfs/x/y files, where
- * x is the bus number and y the device number.
- *
- * It allows user space programs/"drivers" to communicate directly
- * with USB devices without intervening kernel driver.
- *
- * Revision history
- * 22.12.1999 0.1 Initial release (split from proc_usb.c)
- * 04.01.2000 0.2 Turned into its own filesystem
- */
- /*****************************************************************************/
- #include <linux/fs.h>
- #include <linux/mm.h>
- #include <linux/slab.h>
- #include <linux/smp_lock.h>
- #include <linux/signal.h>
- #include <linux/poll.h>
- #include <linux/usb.h>
- #include <linux/usbdevice_fs.h>
- #include <asm/uaccess.h>
- struct async {
- struct list_head asynclist;
- struct dev_state *ps;
- struct task_struct *task;
- unsigned int signr;
- void *userbuffer;
- void *userurb;
- urb_t urb;
- };
- static loff_t usbdev_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;
- }
- }
- static ssize_t usbdev_read(struct file *file, char * buf, size_t nbytes, loff_t *ppos)
- {
- struct dev_state *ps = (struct dev_state *)file->private_data;
- ssize_t ret = 0;
- unsigned len;
- loff_t pos;
- int i;
- pos = *ppos;
- down_read(&ps->devsem);
- if (!ps->dev) {
- ret = -ENODEV;
- goto err;
- } else if (pos < 0) {
- ret = -EINVAL;
- goto err;
- }
- if (pos < sizeof(struct usb_device_descriptor)) {
- len = sizeof(struct usb_device_descriptor) - pos;
- if (len > nbytes)
- len = nbytes;
- if (copy_to_user(buf, ((char *)&ps->dev->descriptor) + pos, len)) {
- ret = -EFAULT;
- goto err;
- }
- *ppos += len;
- buf += len;
- nbytes -= len;
- ret += len;
- }
- pos = sizeof(struct usb_device_descriptor);
- for (i = 0; nbytes && i < ps->dev->descriptor.bNumConfigurations; i++) {
- struct usb_config_descriptor *config =
- (struct usb_config_descriptor *)ps->dev->rawdescriptors[i];
- unsigned int length = le16_to_cpu(config->wTotalLength);
- if (*ppos < pos + length) {
- len = length - (*ppos - pos);
- if (len > nbytes)
- len = nbytes;
- if (copy_to_user(buf,
- ps->dev->rawdescriptors[i] + (*ppos - pos), len)) {
- ret = -EFAULT;
- goto err;
- }
- *ppos += len;
- buf += len;
- nbytes -= len;
- ret += len;
- }
- pos += length;
- }
- err:
- up_read(&ps->devsem);
- return ret;
- }
- extern inline unsigned int ld2(unsigned int x)
- {
- unsigned int r = 0;
-
- if (x >= 0x10000) {
- x >>= 16;
- r += 16;
- }
- if (x >= 0x100) {
- x >>= 8;
- r += 8;
- }
- if (x >= 0x10) {
- x >>= 4;
- r += 4;
- }
- if (x >= 4) {
- x >>= 2;
- r += 2;
- }
- if (x >= 2)
- r++;
- return r;
- }
- /*
- * async list handling
- */
- static struct async *alloc_async(unsigned int numisoframes)
- {
- unsigned int assize = sizeof(struct async) + numisoframes * sizeof(iso_packet_descriptor_t);
- struct async *as = kmalloc(assize, GFP_KERNEL);
- if (!as)
- return NULL;
- memset(as, 0, assize);
- as->urb.number_of_packets = numisoframes;
- spin_lock_init(&as->urb.lock);
- return as;
- }
- static void free_async(struct async *as)
- {
- if (as->urb.transfer_buffer)
- kfree(as->urb.transfer_buffer);
- if (as->urb.setup_packet)
- kfree(as->urb.setup_packet);
- kfree(as);
- }
- extern __inline__ void async_newpending(struct async *as)
- {
- struct dev_state *ps = as->ps;
- unsigned long flags;
-
- spin_lock_irqsave(&ps->lock, flags);
- list_add_tail(&as->asynclist, &ps->async_pending);
- spin_unlock_irqrestore(&ps->lock, flags);
- }
- extern __inline__ void async_removepending(struct async *as)
- {
- struct dev_state *ps = as->ps;
- unsigned long flags;
-
- spin_lock_irqsave(&ps->lock, flags);
- list_del(&as->asynclist);
- INIT_LIST_HEAD(&as->asynclist);
- spin_unlock_irqrestore(&ps->lock, flags);
- }
- extern __inline__ struct async *async_getcompleted(struct dev_state *ps)
- {
- unsigned long flags;
- struct async *as = NULL;
- spin_lock_irqsave(&ps->lock, flags);
- if (!list_empty(&ps->async_completed)) {
- as = list_entry(ps->async_completed.next, struct async, asynclist);
- list_del(&as->asynclist);
- INIT_LIST_HEAD(&as->asynclist);
- }
- spin_unlock_irqrestore(&ps->lock, flags);
- return as;
- }
- extern __inline__ struct async *async_getpending(struct dev_state *ps, void *userurb)
- {
- unsigned long flags;
- struct async *as;
- struct list_head *p;
- spin_lock_irqsave(&ps->lock, flags);
- for (p = ps->async_pending.next; p != &ps->async_pending; ) {
- as = list_entry(p, struct async, asynclist);
- p = p->next;
- if (as->userurb != userurb)
- continue;
- list_del(&as->asynclist);
- INIT_LIST_HEAD(&as->asynclist);
- spin_unlock_irqrestore(&ps->lock, flags);
- return as;
- }
- spin_unlock_irqrestore(&ps->lock, flags);
- return NULL;
- }
- static void async_completed(purb_t urb)
- {
- struct async *as = (struct async *)urb->context;
- struct dev_state *ps = as->ps;
- struct siginfo sinfo;
- spin_lock(&ps->lock);
- list_del(&as->asynclist);
- list_add_tail(&as->asynclist, &ps->async_completed);
- spin_unlock(&ps->lock);
- wake_up(&ps->wait);
- if (as->signr) {
- sinfo.si_signo = as->signr;
- sinfo.si_errno = as->urb.status;
- sinfo.si_code = SI_ASYNCIO;
- sinfo.si_addr = as->userurb;
- send_sig_info(as->signr, &sinfo, as->task);
- }
- }
- static void destroy_all_async(struct dev_state *ps)
- {
- struct async *as;
- unsigned long flags;
- spin_lock_irqsave(&ps->lock, flags);
- while (!list_empty(&ps->async_pending)) {
- as = list_entry(ps->async_pending.next, struct async, asynclist);
- list_del(&as->asynclist);
- INIT_LIST_HEAD(&as->asynclist);
- spin_unlock_irqrestore(&ps->lock, flags);
- /* usb_unlink_urb calls the completion handler with status == USB_ST_URB_KILLED */
- usb_unlink_urb(&as->urb);
- spin_lock_irqsave(&ps->lock, flags);
- }
- spin_unlock_irqrestore(&ps->lock, flags);
- while ((as = async_getcompleted(ps)))
- free_async(as);
- }
- /*
- * interface claiming
- */
- static void *driver_probe(struct usb_device *dev, unsigned int intf,
- const struct usb_device_id *id)
- {
- return NULL;
- }
- static void driver_disconnect(struct usb_device *dev, void *context)
- {
- struct dev_state *ps = (struct dev_state *)context;
- ps->ifclaimed = 0;
- }
- struct usb_driver usbdevfs_driver = {
- name: "usbdevfs",
- probe: driver_probe,
- disconnect: driver_disconnect,
- };
- static int claimintf(struct dev_state *ps, unsigned int intf)
- {
- struct usb_device *dev = ps->dev;
- struct usb_interface *iface;
- int err;
- if (intf >= 8*sizeof(ps->ifclaimed) || !dev || intf >= dev->actconfig->bNumInterfaces)
- return -EINVAL;
- /* already claimed */
- if (test_bit(intf, &ps->ifclaimed))
- return 0;
- iface = &dev->actconfig->interface[intf];
- err = -EBUSY;
- lock_kernel();
- if (!usb_interface_claimed(iface)) {
- usb_driver_claim_interface(&usbdevfs_driver, iface, ps);
- set_bit(intf, &ps->ifclaimed);
- err = 0;
- }
- unlock_kernel();
- return err;
- }
- static int releaseintf(struct dev_state *ps, unsigned int intf)
- {
- struct usb_device *dev;
- struct usb_interface *iface;
- int err;
- if (intf >= 8*sizeof(ps->ifclaimed))
- return -EINVAL;
- err = -EINVAL;
- lock_kernel();
- dev = ps->dev;
- if (dev && test_and_clear_bit(intf, &ps->ifclaimed)) {
- iface = &dev->actconfig->interface[intf];
- usb_driver_release_interface(&usbdevfs_driver, iface);
- err = 0;
- }
- unlock_kernel();
- return err;
- }
- static int checkintf(struct dev_state *ps, unsigned int intf)
- {
- if (intf >= 8*sizeof(ps->ifclaimed))
- return -EINVAL;
- if (test_bit(intf, &ps->ifclaimed))
- return 0;
- /* if not yet claimed, claim it for the driver */
- printk(KERN_WARNING "usbdevfs: process %d (%s) did not claim interface %u before usen",
- current->pid, current->comm, intf);
- return claimintf(ps, intf);
- }
- static int findintfep(struct usb_device *dev, unsigned int ep)
- {
- unsigned int i, j, e;
- struct usb_interface *iface;
- struct usb_interface_descriptor *alts;
- struct usb_endpoint_descriptor *endpt;
- if (ep & ~(USB_DIR_IN|0xf))
- return -EINVAL;
- for (i = 0; i < dev->actconfig->bNumInterfaces; i++) {
- iface = &dev->actconfig->interface[i];
- for (j = 0; j < iface->num_altsetting; j++) {
- alts = &iface->altsetting[j];
- for (e = 0; e < alts->bNumEndpoints; e++) {
- endpt = &alts->endpoint[e];
- if (endpt->bEndpointAddress == ep)
- return i;
- }
- }
- }
- return -ENOENT;
- }
- static int findintfif(struct usb_device *dev, unsigned int ifn)
- {
- unsigned int i, j;
- struct usb_interface *iface;
- struct usb_interface_descriptor *alts;
- if (ifn & ~0xff)
- return -EINVAL;
- for (i = 0; i < dev->actconfig->bNumInterfaces; i++) {
- iface = &dev->actconfig->interface[i];
- for (j = 0; j < iface->num_altsetting; j++) {
- alts = &iface->altsetting[j];
- if (alts->bInterfaceNumber == ifn)
- return i;
- }
- }
- return -ENOENT;
- }
- extern struct list_head usb_driver_list;
- #if 0
- static int finddriver(struct usb_driver **driver, char *name)
- {
- struct list_head *tmp;
- tmp = usb_driver_list.next;
- while (tmp != &usb_driver_list) {
- struct usb_driver *d = list_entry(tmp, struct usb_driver,
- driver_list);
- if (!strcmp(d->name, name)) {
- *driver = d;
- return 0;
- }
- tmp = tmp->next;
- }
- return -EINVAL;
- }
- #endif
- static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype, unsigned int index)
- {
- int ret;
- if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype))
- return 0;
- switch (requesttype & USB_RECIP_MASK) {
- case USB_RECIP_ENDPOINT:
- if ((ret = findintfep(ps->dev, index & 0xff)) < 0)
- return ret;
- if ((ret = checkintf(ps, ret)))
- return ret;
- break;
- case USB_RECIP_INTERFACE:
- if ((ret = findintfif(ps->dev, index & 0xff)) < 0)
- return ret;
- if ((ret = checkintf(ps, ret)))
- return ret;
- break;
- }
- return 0;
- }
- /*
- * file operations
- */
- static int usbdev_open(struct inode *inode, struct file *file)
- {
- struct usb_device *dev;
- struct dev_state *ps;
- int ret;
- /*
- * no locking necessary here, as both sys_open (actually filp_open)
- * and the hub thread have the kernel lock
- * (still acquire the kernel lock for safety)
- */
- lock_kernel();
- ret = -ENOENT;
- if (ITYPE(inode->i_ino) != IDEVICE)
- goto out;
- dev = inode->u.usbdev_i.p.dev;
- if (!dev)
- goto out;
- ret = -ENOMEM;
- if (!(ps = kmalloc(sizeof(struct dev_state), GFP_KERNEL)))
- goto out;
- ret = 0;
- ps->dev = dev;
- ps->file = file;
- spin_lock_init(&ps->lock);
- INIT_LIST_HEAD(&ps->async_pending);
- INIT_LIST_HEAD(&ps->async_completed);
- init_waitqueue_head(&ps->wait);
- init_rwsem(&ps->devsem);
- ps->discsignr = 0;
- ps->disctask = current;
- ps->disccontext = NULL;
- ps->ifclaimed = 0;
- wmb();
- list_add_tail(&ps->list, &dev->filelist);
- file->private_data = ps;
- out:
- unlock_kernel();
- return ret;
- }
- static int usbdev_release(struct inode *inode, struct file *file)
- {
- struct dev_state *ps = (struct dev_state *)file->private_data;
- unsigned int i;
- lock_kernel();
- list_del(&ps->list);
- INIT_LIST_HEAD(&ps->list);
- if (ps->dev) {
- for (i = 0; ps->ifclaimed && i < 8*sizeof(ps->ifclaimed); i++)
- if (test_bit(i, &ps->ifclaimed))
- releaseintf(ps, i);
- }
- unlock_kernel();
- destroy_all_async(ps);
- kfree(ps);
- return 0;
- }
- static int proc_control(struct dev_state *ps, void *arg)
- {
- struct usb_device *dev = ps->dev;
- struct usbdevfs_ctrltransfer ctrl;
- unsigned int tmo;
- unsigned char *tbuf;
- int i, ret;
- if (copy_from_user(&ctrl, (void *)arg, sizeof(ctrl)))
- return -EFAULT;
- if ((ret = check_ctrlrecip(ps, ctrl.requesttype, ctrl.index)))
- return ret;
- if (ctrl.length > PAGE_SIZE)
- return -EINVAL;
- if (!(tbuf = (unsigned char *)__get_free_page(GFP_KERNEL)))
- return -ENOMEM;
- tmo = (ctrl.timeout * HZ + 999) / 1000;
- if (ctrl.requesttype & 0x80) {
- if (ctrl.length && !access_ok(VERIFY_WRITE, ctrl.data, ctrl.length)) {
- free_page((unsigned long)tbuf);
- return -EINVAL;
- }
- i = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), ctrl.request, ctrl.requesttype,
- ctrl.value, ctrl.index, tbuf, ctrl.length, tmo);
- if ((i > 0) && ctrl.length) {
- if (copy_to_user(ctrl.data, tbuf, ctrl.length)) {
- free_page((unsigned long)tbuf);
- return -EFAULT;
- }
- }
- } else {
- if (ctrl.length) {
- if (copy_from_user(tbuf, ctrl.data, ctrl.length)) {
- free_page((unsigned long)tbuf);
- return -EFAULT;
- }
- }
- i = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), ctrl.request, ctrl.requesttype,
- ctrl.value, ctrl.index, tbuf, ctrl.length, tmo);
- }
- free_page((unsigned long)tbuf);
- if (i<0) {
- printk(KERN_DEBUG "usbdevfs: USBDEVFS_CONTROL failed dev %d rqt %u rq %u len %u ret %dn",
- dev->devnum, ctrl.requesttype, ctrl.request, ctrl.length, i);
- }
- return i;
- }
- static int proc_bulk(struct dev_state *ps, void *arg)
- {
- struct usb_device *dev = ps->dev;
- struct usbdevfs_bulktransfer bulk;
- unsigned int tmo, len1, pipe;
- int len2;
- unsigned char *tbuf;
- int i, ret;
- if (copy_from_user(&bulk, (void *)arg, sizeof(bulk)))
- return -EFAULT;
- if ((ret = findintfep(ps->dev, bulk.ep)) < 0)
- return ret;
- if ((ret = checkintf(ps, ret)))
- return ret;
- if (bulk.ep & USB_DIR_IN)
- pipe = usb_rcvbulkpipe(dev, bulk.ep & 0x7f);
- else
- pipe = usb_sndbulkpipe(dev, bulk.ep & 0x7f);
- if (!usb_maxpacket(dev, pipe, !(bulk.ep & USB_DIR_IN)))
- return -EINVAL;
- len1 = bulk.len;
- if (len1 > PAGE_SIZE)
- return -EINVAL;
- if (!(tbuf = (unsigned char *)__get_free_page(GFP_KERNEL)))
- return -ENOMEM;
- tmo = (bulk.timeout * HZ + 999) / 1000;
- if (bulk.ep & 0x80) {
- if (len1 && !access_ok(VERIFY_WRITE, bulk.data, len1)) {
- free_page((unsigned long)tbuf);
- return -EINVAL;
- }
- i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
- if (!i && len2) {
- if (copy_to_user(bulk.data, tbuf, len2)) {
- free_page((unsigned long)tbuf);
- return -EFAULT;
- }
- }
- } else {
- if (len1) {
- if (copy_from_user(tbuf, bulk.data, len1)) {
- free_page((unsigned long)tbuf);
- return -EFAULT;
- }
- }
- i = usb_bulk_msg(dev, pipe, tbuf, len1, &len2, tmo);
- }
- free_page((unsigned long)tbuf);
- if (i < 0) {
- printk(KERN_WARNING "usbdevfs: USBDEVFS_BULK failed dev %d ep 0x%x len %u ret %dn",
- dev->devnum, bulk.ep, bulk.len, i);
- return i;
- }
- return len2;
- }
- static int proc_resetep(struct dev_state *ps, void *arg)
- {
- unsigned int ep;
- int ret;
- if (get_user(ep, (unsigned int *)arg))
- return -EFAULT;
- if ((ret = findintfep(ps->dev, ep)) < 0)
- return ret;
- if ((ret = checkintf(ps, ret)))
- return ret;
- usb_settoggle(ps->dev, ep & 0xf, !(ep & USB_DIR_IN), 0);
- return 0;
- }
- static int proc_clearhalt(struct dev_state *ps, void *arg)
- {
- unsigned int ep;
- int pipe;
- int ret;
- if (get_user(ep, (unsigned int *)arg))
- return -EFAULT;
- if ((ret = findintfep(ps->dev, ep)) < 0)
- return ret;
- if ((ret = checkintf(ps, ret)))
- return ret;
- if (ep & USB_DIR_IN)
- pipe = usb_rcvbulkpipe(ps->dev, ep & 0x7f);
- else
- pipe = usb_sndbulkpipe(ps->dev, ep & 0x7f);
- return usb_clear_halt(ps->dev, pipe);
- }
-
- static int proc_getdriver(struct dev_state *ps, void *arg)
- {
- struct usbdevfs_getdriver gd;
- struct usb_interface *interface;
- int ret;
- if (copy_from_user(&gd, arg, sizeof(gd)))
- return -EFAULT;
- if ((ret = findintfif(ps->dev, gd.interface)) < 0)
- return ret;
- interface = usb_ifnum_to_if(ps->dev, gd.interface);
- if (!interface)
- return -EINVAL;
- if (!interface->driver)
- return -ENODATA;
- strcpy(gd.driver, interface->driver->name);
- if (copy_to_user(arg, &gd, sizeof(gd)))
- return -EFAULT;
- return 0;
- }
- static int proc_connectinfo(struct dev_state *ps, void *arg)
- {
- struct usbdevfs_connectinfo ci;
- ci.devnum = ps->dev->devnum;
- ci.slow = ps->dev->speed == USB_SPEED_LOW;
- if (copy_to_user(arg, &ci, sizeof(ci)))
- return -EFAULT;
- return 0;
- }
- static int proc_resetdevice(struct dev_state *ps)
- {
- int i, ret;
- ret = usb_reset_device(ps->dev);
- if (ret < 0)
- return ret;
- for (i = 0; i < ps->dev->actconfig->bNumInterfaces; i++) {
- struct usb_interface *intf = &ps->dev->actconfig->interface[i];
- /* Don't simulate interfaces we've claimed */
- if (test_bit(i, &ps->ifclaimed))
- continue;
- if (intf->driver) {
- const struct usb_device_id *id;
- down(&intf->driver->serialize);
- intf->driver->disconnect(ps->dev, intf->private_data);
- id = usb_match_id(ps->dev,intf,intf->driver->id_table);
- intf->driver->probe(ps->dev, i, id);
- up(&intf->driver->serialize);
- }
- }
- return 0;
- }
- static int proc_setintf(struct dev_state *ps, void *arg)
- {
- struct usbdevfs_setinterface setintf;
- struct usb_interface *interface;
- int ret;
- if (copy_from_user(&setintf, arg, sizeof(setintf)))
- return -EFAULT;
- if ((ret = findintfif(ps->dev, setintf.interface)) < 0)
- return ret;
- interface = usb_ifnum_to_if(ps->dev, setintf.interface);
- if (!interface)
- return -EINVAL;
- if (interface->driver) {
- if ((ret = checkintf(ps, ret)))
- return ret;
- }
- if (usb_set_interface(ps->dev, setintf.interface, setintf.altsetting))
- return -EINVAL;
- return 0;
- }
- static int proc_setconfig(struct dev_state *ps, void *arg)
- {
- unsigned int u;
- if (get_user(u, (unsigned int *)arg))
- return -EFAULT;
- if (usb_set_configuration(ps->dev, u) < 0)
- return -EINVAL;
- return 0;
- }
- static int proc_submiturb(struct dev_state *ps, void *arg)
- {
- struct usbdevfs_urb uurb;
- struct usbdevfs_iso_packet_desc *isopkt = NULL;
- struct usb_endpoint_descriptor *ep_desc;
- struct async *as;
- devrequest *dr = NULL;
- unsigned int u, totlen, isofrmlen;
- int ret;
- if (copy_from_user(&uurb, arg, sizeof(uurb)))
- return -EFAULT;
- if (uurb.flags & ~(USBDEVFS_URB_ISO_ASAP|USBDEVFS_URB_DISABLE_SPD|USBDEVFS_URB_QUEUE_BULK|
- USB_NO_FSBR|USB_ZERO_PACKET))
- return -EINVAL;
- if (!uurb.buffer)
- return -EINVAL;
- if (uurb.signr != 0 && (uurb.signr < SIGRTMIN || uurb.signr > SIGRTMAX))
- return -EINVAL;
- if (!(uurb.type == USBDEVFS_URB_TYPE_CONTROL && (uurb.endpoint & ~USB_ENDPOINT_DIR_MASK) == 0)) {
- if ((ret = findintfep(ps->dev, uurb.endpoint)) < 0)
- return ret;
- if ((ret = checkintf(ps, ret)))
- return ret;
- }
- switch(uurb.type) {
- case USBDEVFS_URB_TYPE_CONTROL:
- if ((uurb.endpoint & ~USB_ENDPOINT_DIR_MASK) != 0) {
- if (!(ep_desc = usb_epnum_to_ep_desc(ps->dev, uurb.endpoint)))
- return -ENOENT;
- if ((ep_desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) != USB_ENDPOINT_XFER_CONTROL)
- return -EINVAL;
- }
- /* min 8 byte setup packet, max arbitrary */
- if (uurb.buffer_length < 8 || uurb.buffer_length > PAGE_SIZE)
- return -EINVAL;
- if (!(dr = kmalloc(sizeof(devrequest), GFP_KERNEL)))
- return -ENOMEM;
- if (copy_from_user(dr, (unsigned char*)uurb.buffer, 8)) {
- kfree(dr);
- return -EFAULT;
- }
- if (uurb.buffer_length < (le16_to_cpup(&dr->length) + 8)) {
- kfree(dr);
- return -EINVAL;
- }
- if ((ret = check_ctrlrecip(ps, dr->requesttype, le16_to_cpup(&dr->index)))) {
- kfree(dr);
- return ret;
- }
- uurb.endpoint = (uurb.endpoint & ~USB_ENDPOINT_DIR_MASK) | (dr->requesttype & USB_ENDPOINT_DIR_MASK);
- uurb.number_of_packets = 0;
- uurb.buffer_length = le16_to_cpup(&dr->length);
- uurb.buffer += 8;
- if (!access_ok((uurb.endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb.buffer, uurb.buffer_length)) {
- kfree(dr);
- return -EFAULT;
- }
- break;
- case USBDEVFS_URB_TYPE_BULK:
- uurb.number_of_packets = 0;
- if (uurb.buffer_length > 16384)
- return -EINVAL;
- if (!access_ok((uurb.endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb.buffer, uurb.buffer_length))
- return -EFAULT;
- break;
- case USBDEVFS_URB_TYPE_ISO:
- /* arbitrary limit */
- if (uurb.number_of_packets < 1 || uurb.number_of_packets > 128)
- return -EINVAL;
- isofrmlen = sizeof(struct usbdevfs_iso_packet_desc) * uurb.number_of_packets;
- if (!(isopkt = kmalloc(isofrmlen, GFP_KERNEL)))
- return -ENOMEM;
- if (copy_from_user(isopkt, &((struct usbdevfs_urb *)arg)->iso_frame_desc, isofrmlen)) {
- kfree(isopkt);
- return -EFAULT;
- }
- for (totlen = u = 0; u < uurb.number_of_packets; u++) {
- if (isopkt[u].length > 1023) {
- kfree(isopkt);
- return -EINVAL;
- }
- totlen += isopkt[u].length;
- }
- if (totlen > 32768) {
- kfree(isopkt);
- return -EINVAL;
- }
- uurb.buffer_length = totlen;
- break;
- case USBDEVFS_URB_TYPE_INTERRUPT:
- uurb.number_of_packets = 0;
- if (uurb.buffer_length > 16384)
- return -EINVAL;
- if (!access_ok((uurb.endpoint & USB_DIR_IN) ? VERIFY_WRITE : VERIFY_READ, uurb.buffer, uurb.buffer_length))
- return -EFAULT;
- break;
- default:
- return -EINVAL;
- }
- if (!(as = alloc_async(uurb.number_of_packets))) {
- if (isopkt)
- kfree(isopkt);
- if (dr)
- kfree(dr);
- return -ENOMEM;
- }
- if (!(as->urb.transfer_buffer = kmalloc(uurb.buffer_length, GFP_KERNEL))) {
- if (isopkt)
- kfree(isopkt);
- if (dr)
- kfree(dr);
- free_async(as);
- return -ENOMEM;
- }
- as->urb.next = NULL;
- as->urb.dev = ps->dev;
- as->urb.pipe = (uurb.type << 30) | __create_pipe(ps->dev, uurb.endpoint & 0xf) | (uurb.endpoint & USB_DIR_IN);
- as->urb.transfer_flags = uurb.flags;
- as->urb.transfer_buffer_length = uurb.buffer_length;
- as->urb.setup_packet = (unsigned char*)dr;
- as->urb.start_frame = uurb.start_frame;
- as->urb.number_of_packets = uurb.number_of_packets;
- as->urb.context = as;
- as->urb.complete = async_completed;
- for (totlen = u = 0; u < uurb.number_of_packets; u++) {
- as->urb.iso_frame_desc[u].offset = totlen;
- as->urb.iso_frame_desc[u].length = isopkt[u].length;
- totlen += isopkt[u].length;
- }
- if (isopkt)
- kfree(isopkt);
- as->ps = ps;
- as->userurb = arg;
- if (uurb.endpoint & USB_DIR_IN)
- as->userbuffer = uurb.buffer;
- else
- as->userbuffer = NULL;
- as->signr = uurb.signr;
- as->task = current;
- if (!(uurb.endpoint & USB_DIR_IN)) {
- if (copy_from_user(as->urb.transfer_buffer, uurb.buffer, as->urb.transfer_buffer_length)) {
- free_async(as);
- return -EFAULT;
- }
- }
- async_newpending(as);
- if ((ret = usb_submit_urb(&as->urb))) {
- printk(KERN_DEBUG "usbdevfs: usb_submit_urb returned %dn", ret);
- async_removepending(as);
- free_async(as);
- return ret;
- }
- return 0;
- }
- static int proc_unlinkurb(struct dev_state *ps, void *arg)
- {
- struct async *as;
- as = async_getpending(ps, arg);
- if (!as)
- return -EINVAL;
- usb_unlink_urb(&as->urb);
- return 0;
- }
- static int processcompl(struct async *as)
- {
- unsigned int i;
- if (as->userbuffer)
- if (copy_to_user(as->userbuffer, as->urb.transfer_buffer, as->urb.transfer_buffer_length))
- return -EFAULT;
- if (put_user(as->urb.status,
- &((struct usbdevfs_urb *)as->userurb)->status))
- return -EFAULT;
- if (put_user(as->urb.actual_length,
- &((struct usbdevfs_urb *)as->userurb)->actual_length))
- return -EFAULT;
- if (put_user(as->urb.error_count,
- &((struct usbdevfs_urb *)as->userurb)->error_count))
- return -EFAULT;
- if (!(usb_pipeisoc(as->urb.pipe)))
- return 0;
- for (i = 0; i < as->urb.number_of_packets; i++) {
- if (put_user(as->urb.iso_frame_desc[i].actual_length,
- &((struct usbdevfs_urb *)as->userurb)->iso_frame_desc[i].actual_length))
- return -EFAULT;
- if (put_user(as->urb.iso_frame_desc[i].status,
- &((struct usbdevfs_urb *)as->userurb)->iso_frame_desc[i].status))
- return -EFAULT;
- }
- return 0;
- }
- static int proc_reapurb(struct dev_state *ps, void *arg)
- {
- DECLARE_WAITQUEUE(wait, current);
- struct async *as = NULL;
- void *addr;
- int ret;
- add_wait_queue(&ps->wait, &wait);
- while (ps->dev) {
- __set_current_state(TASK_INTERRUPTIBLE);
- if ((as = async_getcompleted(ps)))
- break;
- if (signal_pending(current))
- break;
- up_read(&ps->devsem);
- schedule();
- down_read(&ps->devsem);
- }
- remove_wait_queue(&ps->wait, &wait);
- set_current_state(TASK_RUNNING);
- if (as) {
- ret = processcompl(as);
- addr = as->userurb;
- free_async(as);
- if (ret)
- return ret;
- if (put_user(addr, (void **)arg))
- return -EFAULT;
- return 0;
- }
- if (signal_pending(current))
- return -EINTR;
- return -EIO;
- }
- static int proc_reapurbnonblock(struct dev_state *ps, void *arg)
- {
- struct async *as;
- void *addr;
- int ret;
- if (!(as = async_getcompleted(ps)))
- return -EAGAIN;
- ret = processcompl(as);
- addr = as->userurb;
- free_async(as);
- if (ret)
- return ret;
- if (put_user(addr, (void **)arg))
- return -EFAULT;
- return 0;
- }
- static int proc_disconnectsignal(struct dev_state *ps, void *arg)
- {
- struct usbdevfs_disconnectsignal ds;
- if (copy_from_user(&ds, arg, sizeof(ds)))
- return -EFAULT;
- if (ds.signr != 0 && (ds.signr < SIGRTMIN || ds.signr > SIGRTMAX))
- return -EINVAL;
- ps->discsignr = ds.signr;
- ps->disccontext = ds.context;
- return 0;
- }
- static int proc_claiminterface(struct dev_state *ps, void *arg)
- {
- unsigned int intf;
- int ret;
- if (get_user(intf, (unsigned int *)arg))
- return -EFAULT;
- if ((ret = findintfif(ps->dev, intf)) < 0)
- return ret;
- return claimintf(ps, ret);
- }
- static int proc_releaseinterface(struct dev_state *ps, void *arg)
- {
- unsigned int intf;
- int ret;
- if (get_user(intf, (unsigned int *)arg))
- return -EFAULT;
- if ((ret = findintfif(ps->dev, intf)) < 0)
- return ret;
- return releaseintf(ps, intf);
- }
- static int proc_ioctl (struct dev_state *ps, void *arg)
- {
- struct usbdevfs_ioctl ctrl;
- int size;
- void *buf = 0;
- int retval = 0;
- /* get input parameters and alloc buffer */
- if (copy_from_user(&ctrl, (void *) arg, sizeof (ctrl)))
- return -EFAULT;
- if ((size = _IOC_SIZE (ctrl.ioctl_code)) > 0) {
- if ((buf = kmalloc (size, GFP_KERNEL)) == 0)
- return -ENOMEM;
- if ((_IOC_DIR(ctrl.ioctl_code) & _IOC_WRITE)) {
- if (copy_from_user (buf, ctrl.data, size)) {
- kfree (buf);
- return -EFAULT;
- }
- } else {
- memset (buf, 0, size);
- }
- }
- /* ioctl to device */
- if (ctrl.ifno < 0) {
- switch (ctrl.ioctl_code) {
- /* access/release token for issuing control messages
- * ask a particular driver to bind/unbind, ... etc
- */
- }
- retval = -ENOSYS;
- /* ioctl to the driver which has claimed a given interface */
- } else {
- struct usb_interface *ifp = 0;
- if (!ps->dev)
- retval = -ENODEV;
- else if (ctrl.ifno >= ps->dev->actconfig->bNumInterfaces)
- retval = -EINVAL;
- else {
- if (!(ifp = usb_ifnum_to_if (ps->dev, ctrl.ifno)))
- retval = -EINVAL;
- else if (ifp->driver == 0 || ifp->driver->ioctl == 0)
- retval = -ENOSYS;
- }
- if (retval == 0)
- /* ifno might usefully be passed ... */
- retval = ifp->driver->ioctl (ps->dev, ctrl.ioctl_code, buf);
- /* size = min_t(int, size, retval)? */
- }
- /* cleanup and return */
- if (retval >= 0
- && (_IOC_DIR (ctrl.ioctl_code) & _IOC_READ) != 0
- && size > 0
- && copy_to_user (ctrl.data, buf, size) != 0)
- retval = -EFAULT;
- if (buf != 0)
- kfree (buf);
- return retval;
- }
- static int usbdev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
- {
- struct dev_state *ps = (struct dev_state *)file->private_data;
- int ret = -ENOIOCTLCMD;
- if (!(file->f_mode & FMODE_WRITE))
- return -EPERM;
- down_read(&ps->devsem);
- if (!ps->dev) {
- up_read(&ps->devsem);
- return -ENODEV;
- }
- switch (cmd) {
- case USBDEVFS_CONTROL:
- ret = proc_control(ps, (void *)arg);
- if (ret >= 0)
- inode->i_mtime = CURRENT_TIME;
- break;
- case USBDEVFS_BULK:
- ret = proc_bulk(ps, (void *)arg);
- if (ret >= 0)
- inode->i_mtime = CURRENT_TIME;
- break;
- case USBDEVFS_RESETEP:
- ret = proc_resetep(ps, (void *)arg);
- if (ret >= 0)
- inode->i_mtime = CURRENT_TIME;
- break;
- case USBDEVFS_RESET:
- ret = proc_resetdevice(ps);
- break;
-
- case USBDEVFS_CLEAR_HALT:
- ret = proc_clearhalt(ps, (void *)arg);
- if (ret >= 0)
- inode->i_mtime = CURRENT_TIME;
- break;
- case USBDEVFS_GETDRIVER:
- ret = proc_getdriver(ps, (void *)arg);
- break;
- case USBDEVFS_CONNECTINFO:
- ret = proc_connectinfo(ps, (void *)arg);
- break;
- case USBDEVFS_SETINTERFACE:
- ret = proc_setintf(ps, (void *)arg);
- break;
- case USBDEVFS_SETCONFIGURATION:
- ret = proc_setconfig(ps, (void *)arg);
- break;
- case USBDEVFS_SUBMITURB:
- ret = proc_submiturb(ps, (void *)arg);
- if (ret >= 0)
- inode->i_mtime = CURRENT_TIME;
- break;
- case USBDEVFS_DISCARDURB:
- ret = proc_unlinkurb(ps, (void *)arg);
- break;
- case USBDEVFS_REAPURB:
- ret = proc_reapurb(ps, (void *)arg);
- break;
- case USBDEVFS_REAPURBNDELAY:
- ret = proc_reapurbnonblock(ps, (void *)arg);
- break;
- case USBDEVFS_DISCSIGNAL:
- ret = proc_disconnectsignal(ps, (void *)arg);
- break;
- case USBDEVFS_CLAIMINTERFACE:
- ret = proc_claiminterface(ps, (void *)arg);
- break;
- case USBDEVFS_RELEASEINTERFACE:
- ret = proc_releaseinterface(ps, (void *)arg);
- break;
- case USBDEVFS_IOCTL:
- ret = proc_ioctl(ps, (void *) arg);
- break;
- }
- up_read(&ps->devsem);
- if (ret >= 0)
- inode->i_atime = CURRENT_TIME;
- return ret;
- }
- /* No kernel lock - fine */
- static unsigned int usbdev_poll(struct file *file, struct poll_table_struct *wait)
- {
- struct dev_state *ps = (struct dev_state *)file->private_data;
- unsigned int mask = 0;
- poll_wait(file, &ps->wait, wait);
- if (file->f_mode & FMODE_WRITE && !list_empty(&ps->async_completed))
- mask |= POLLOUT | POLLWRNORM;
- if (!ps->dev)
- mask |= POLLERR | POLLHUP;
- return mask;
- }
- struct file_operations usbdevfs_device_file_operations = {
- llseek: usbdev_lseek,
- read: usbdev_read,
- poll: usbdev_poll,
- ioctl: usbdev_ioctl,
- open: usbdev_open,
- release: usbdev_release,
- };