Lines Matching +full:lock +full:- +full:state
1 // SPDX-License-Identifier: GPL-2.0+
3 * inode.c -- user mode filesystem api for usb gadget controllers
5 * Copyright (C) 2003-2004 David Brownell
50 * Key parts that must be USB-specific are protocols defining how the
51 * read/write operations relate to the hardware state machines. There
56 * - First, dev_config() is called when /dev/gadget/$CHIP is configured
61 * - Then, after a SET_CONFIGURATION control request, ep_config() is
86 /*----------------------------------------------------------------------*/
92 /* DISABLED is the initial state. */
103 * - (UN)CONNECTED: read usb_gadgetfs_event(s) from it
104 * - SETUP: read/write will transfer control data and succeed;
123 spinlock_t lock;
126 enum ep0_state state; /* P: lock */
144 /* the rest is basically write-once */
161 refcount_inc (&data->count);
166 if (likely (!refcount_dec_and_test (&data->count)))
169 BUG_ON (waitqueue_active (&data->wait));
180 dev->state = STATE_DEV_DISABLED;
181 refcount_set (&dev->count, 1);
182 spin_lock_init (&dev->lock);
183 INIT_LIST_HEAD (&dev->epfiles);
184 init_waitqueue_head (&dev->wait);
188 /*----------------------------------------------------------------------*/
199 struct mutex lock;
200 enum ep_state state;
203 /* must hold dev->lock before accessing ep or req */
216 refcount_inc (&data->count);
221 if (likely (!refcount_dec_and_test (&data->count)))
223 put_dev (data->dev);
225 BUG_ON (!list_empty (&data->epfiles));
226 BUG_ON (waitqueue_active (&data->wait));
230 /*----------------------------------------------------------------------*/
241 /*----------------------------------------------------------------------*/
247 /* too wordy: dev_printk(level , &(d)->gadget->dev , fmt , ## args) */
272 /*----------------------------------------------------------------------*/
276 * After opening, configure non-control endpoints. Then use normal
283 struct ep_data *epdata = ep->driver_data;
285 if (!req->context)
287 if (req->status)
288 epdata->status = req->status;
290 epdata->status = req->actual;
291 complete ((struct completion *)req->context);
295 * still need dev->lock to use epdata->ep.
303 if (!mutex_trylock(&epdata->lock))
305 if (epdata->state != STATE_EP_ENABLED &&
306 (!is_write || epdata->state != STATE_EP_READY)) {
307 mutex_unlock(&epdata->lock);
309 val = -EAGAIN;
315 val = mutex_lock_interruptible(&epdata->lock);
319 switch (epdata->state) {
330 pr_debug ("%s: ep %p not available, state %d\n",
331 shortname, epdata, epdata->state);
333 mutex_unlock(&epdata->lock);
334 return -ENODEV;
343 spin_lock_irq (&epdata->dev->lock);
344 if (likely (epdata->ep != NULL)) {
345 struct usb_request *req = epdata->req;
347 req->context = &done;
348 req->complete = epio_complete;
349 req->buf = buf;
350 req->length = len;
351 value = usb_ep_queue (epdata->ep, req, GFP_ATOMIC);
353 value = -ENODEV;
354 spin_unlock_irq (&epdata->dev->lock);
359 spin_lock_irq (&epdata->dev->lock);
360 if (likely (epdata->ep != NULL)) {
361 DBG (epdata->dev, "%s i/o interrupted\n",
362 epdata->name);
363 usb_ep_dequeue (epdata->ep, epdata->req);
364 spin_unlock_irq (&epdata->dev->lock);
367 if (epdata->status == -ECONNRESET)
368 epdata->status = -EINTR;
370 spin_unlock_irq (&epdata->dev->lock);
372 DBG (epdata->dev, "endpoint gone\n");
374 epdata->status = -ENODEV;
377 return epdata->status;
385 struct ep_data *data = fd->private_data;
388 value = mutex_lock_interruptible(&data->lock);
393 if (data->state != STATE_EP_UNBOUND) {
394 data->state = STATE_EP_DISABLED;
395 data->desc.bDescriptorType = 0;
396 data->hs_desc.bDescriptorType = 0;
397 usb_ep_disable(data->ep);
399 mutex_unlock(&data->lock);
406 struct ep_data *data = fd->private_data;
409 if ((status = get_ready_ep (fd->f_flags, data, false)) < 0)
412 spin_lock_irq (&data->dev->lock);
413 if (likely (data->ep != NULL)) {
416 status = usb_ep_fifo_status (data->ep);
419 usb_ep_fifo_flush (data->ep);
422 status = usb_ep_clear_halt (data->ep);
425 status = -ENOTTY;
428 status = -ENODEV;
429 spin_unlock_irq (&data->dev->lock);
430 mutex_unlock(&data->lock);
434 /*----------------------------------------------------------------------*/
452 struct kiocb_priv *priv = iocb->private;
457 epdata = priv->epdata;
458 // spin_lock(&epdata->dev->lock);
459 if (likely(epdata && epdata->ep && priv->req))
460 value = usb_ep_dequeue (epdata->ep, priv->req);
462 value = -EINVAL;
463 // spin_unlock(&epdata->dev->lock);
472 struct mm_struct *mm = priv->mm;
473 struct kiocb *iocb = priv->iocb;
477 ret = copy_to_iter(priv->buf, priv->actual, &priv->to);
480 ret = -EFAULT;
483 iocb->ki_complete(iocb, ret);
485 kfree(priv->buf);
486 kfree(priv->to_free);
492 struct kiocb *iocb = req->context;
493 struct kiocb_priv *priv = iocb->private;
494 struct ep_data *epdata = priv->epdata;
496 /* lock against disconnect (and ideally, cancel) */
497 spin_lock(&epdata->dev->lock);
498 priv->req = NULL;
499 priv->epdata = NULL;
505 if (priv->to_free == NULL || unlikely(req->actual == 0)) {
506 kfree(req->buf);
507 kfree(priv->to_free);
509 iocb->private = NULL;
510 iocb->ki_complete(iocb,
511 req->actual ? req->actual : (long)req->status);
514 if (unlikely(0 != req->status))
515 DBG(epdata->dev, "%s fault %d len %d\n",
516 ep->name, req->status, req->actual);
518 priv->buf = req->buf;
519 priv->actual = req->actual;
520 INIT_WORK(&priv->work, ep_user_copy_worker);
521 schedule_work(&priv->work);
525 spin_unlock(&epdata->dev->lock);
538 iocb->private = priv;
539 priv->iocb = iocb;
543 priv->epdata = epdata;
544 priv->actual = 0;
545 priv->mm = current->mm; /* mm teardown waits for iocbs in exit_aio() */
550 spin_lock_irq(&epdata->dev->lock);
551 value = -ENODEV;
552 if (unlikely(epdata->ep == NULL))
555 req = usb_ep_alloc_request(epdata->ep, GFP_ATOMIC);
556 value = -ENOMEM;
560 priv->req = req;
561 req->buf = buf;
562 req->length = len;
563 req->complete = ep_aio_complete;
564 req->context = iocb;
565 value = usb_ep_queue(epdata->ep, req, GFP_ATOMIC);
567 usb_ep_free_request(epdata->ep, req);
570 spin_unlock_irq(&epdata->dev->lock);
571 return -EIOCBQUEUED;
574 spin_unlock_irq(&epdata->dev->lock);
575 kfree(priv->to_free);
584 struct file *file = iocb->ki_filp;
585 struct ep_data *epdata = file->private_data;
590 if ((value = get_ready_ep(file->f_flags, epdata, false)) < 0)
594 if (usb_endpoint_dir_in(&epdata->desc)) {
595 if (usb_endpoint_xfer_isoc(&epdata->desc) ||
597 mutex_unlock(&epdata->lock);
598 return -EINVAL;
600 DBG (epdata->dev, "%s halt\n", epdata->name);
601 spin_lock_irq(&epdata->dev->lock);
602 if (likely(epdata->ep != NULL))
603 usb_ep_set_halt(epdata->ep);
604 spin_unlock_irq(&epdata->dev->lock);
605 mutex_unlock(&epdata->lock);
606 return -EBADMSG;
611 mutex_unlock(&epdata->lock);
612 return -ENOMEM;
617 value = -EFAULT;
620 value = -ENOMEM;
623 priv->to_free = dup_iter(&priv->to, to, GFP_KERNEL);
624 if (!iter_is_ubuf(&priv->to) && !priv->to_free) {
629 if (value == -EIOCBQUEUED)
634 mutex_unlock(&epdata->lock);
643 struct file *file = iocb->ki_filp;
644 struct ep_data *epdata = file->private_data;
650 if ((value = get_ready_ep(file->f_flags, epdata, true)) < 0)
653 configured = epdata->state == STATE_EP_ENABLED;
656 if (configured && !usb_endpoint_dir_in(&epdata->desc)) {
657 if (usb_endpoint_xfer_isoc(&epdata->desc) ||
659 mutex_unlock(&epdata->lock);
660 return -EINVAL;
662 DBG (epdata->dev, "%s halt\n", epdata->name);
663 spin_lock_irq(&epdata->dev->lock);
664 if (likely(epdata->ep != NULL))
665 usb_ep_set_halt(epdata->ep);
666 spin_unlock_irq(&epdata->dev->lock);
667 mutex_unlock(&epdata->lock);
668 return -EBADMSG;
673 mutex_unlock(&epdata->lock);
674 return -ENOMEM;
678 value = -EFAULT;
688 value = -ENOMEM;
691 if (value == -EIOCBQUEUED)
697 mutex_unlock(&epdata->lock);
701 /*----------------------------------------------------------------------*/
734 if (data->state != STATE_EP_READY) {
735 value = -EL2HLT;
746 DBG(data->dev, "config %s, bad tag %d\n", data->name, tag);
750 len -= 4;
757 memcpy(&data->desc, buf, USB_DT_ENDPOINT_SIZE);
758 if (data->desc.bLength != USB_DT_ENDPOINT_SIZE
759 || data->desc.bDescriptorType != USB_DT_ENDPOINT)
764 memcpy(&data->hs_desc, buf + USB_DT_ENDPOINT_SIZE,
766 if (data->hs_desc.bLength != USB_DT_ENDPOINT_SIZE
767 || data->hs_desc.bDescriptorType
769 DBG(data->dev, "config %s, bad hs length or type\n",
770 data->name);
775 spin_lock_irq (&data->dev->lock);
776 if (data->dev->state == STATE_DEV_UNBOUND) {
777 value = -ENOENT;
780 ep = data->ep;
782 value = -ENODEV;
786 switch (data->dev->gadget->speed) {
789 ep->desc = &data->desc;
793 ep->desc = &data->hs_desc;
796 DBG(data->dev, "unconnected, %s init abandoned\n",
797 data->name);
798 value = -EINVAL;
803 data->state = STATE_EP_ENABLED;
807 spin_unlock_irq (&data->dev->lock);
810 data->desc.bDescriptorType = 0;
811 data->hs_desc.bDescriptorType = 0;
815 value = -EINVAL;
822 struct ep_data *data = inode->i_private;
823 int value = -EBUSY;
825 if (mutex_lock_interruptible(&data->lock) != 0)
826 return -EINTR;
827 spin_lock_irq (&data->dev->lock);
828 if (data->dev->state == STATE_DEV_UNBOUND)
829 value = -ENOENT;
830 else if (data->state == STATE_EP_DISABLED) {
832 data->state = STATE_EP_READY;
834 fd->private_data = data;
835 VDEBUG (data->dev, "%s ready\n", data->name);
837 DBG (data->dev, "%s state %d\n",
838 data->name, data->state);
839 spin_unlock_irq (&data->dev->lock);
840 mutex_unlock(&data->lock);
844 /*----------------------------------------------------------------------*/
850 * use this facility may be too simple-minded for real applications.
855 wake_up (&dev->wait);
856 kill_fasync (&dev->fasync, SIGIO, POLL_IN);
861 struct dev_data *dev = ep->driver_data;
863 if (req->buf != dev->rbuf) {
864 kfree(req->buf);
865 req->buf = dev->rbuf;
867 req->complete = epio_complete;
868 dev->setup_out_ready = 0;
873 struct dev_data *dev = ep->driver_data;
878 spin_lock_irqsave(&dev->lock, flags);
879 if (!dev->setup_in) {
880 dev->setup_out_error = (req->status != 0);
881 if (!dev->setup_out_error)
883 dev->setup_out_ready = 1;
888 if (free && req->buf != &dev->rbuf)
890 req->complete = epio_complete;
891 spin_unlock_irqrestore(&dev->lock, flags);
896 struct dev_data *dev = ep->driver_data;
898 if (dev->setup_out_ready) {
900 return -EBUSY;
902 if (len > sizeof (dev->rbuf))
903 req->buf = kmalloc(len, GFP_ATOMIC);
904 if (req->buf == NULL) {
905 req->buf = dev->rbuf;
906 return -ENOMEM;
908 req->complete = ep0_complete;
909 req->length = len;
910 req->zero = 0;
917 struct dev_data *dev = fd->private_data;
919 enum ep0_state state;
921 spin_lock_irq (&dev->lock);
922 if (dev->state <= STATE_DEV_OPENED) {
923 retval = -EINVAL;
928 if (dev->setup_abort) {
929 dev->setup_abort = 0;
930 retval = -EIDRM;
935 if ((state = dev->state) == STATE_DEV_SETUP) {
937 if (dev->setup_in) { /* stall IN */
939 (void) usb_ep_set_halt (dev->gadget->ep0);
940 retval = -EL2HLT;
941 dev->state = STATE_DEV_CONNECTED;
944 struct usb_ep *ep = dev->gadget->ep0;
945 struct usb_request *req = dev->req;
948 ++dev->udc_usage;
949 spin_unlock_irq (&dev->lock);
951 spin_lock_irq (&dev->lock);
952 --dev->udc_usage;
954 dev->state = STATE_DEV_CONNECTED;
957 if (dev->current_config) {
960 if (gadget_is_dualspeed(dev->gadget)
961 && (dev->gadget->speed
963 power = dev->hs_config->bMaxPower;
965 power = dev->config->bMaxPower;
966 usb_gadget_vbus_draw(dev->gadget, 2 * power);
970 if ((fd->f_flags & O_NONBLOCK) != 0
971 && !dev->setup_out_ready) {
972 retval = -EAGAIN;
975 spin_unlock_irq (&dev->lock);
976 retval = wait_event_interruptible (dev->wait,
977 dev->setup_out_ready != 0);
979 /* FIXME state could change from under us */
980 spin_lock_irq (&dev->lock);
984 if (dev->state != STATE_DEV_SETUP) {
985 retval = -ECANCELED;
988 dev->state = STATE_DEV_CONNECTED;
990 if (dev->setup_out_error)
991 retval = -EIO;
993 len = min (len, (size_t)dev->req->actual);
994 ++dev->udc_usage;
995 spin_unlock_irq(&dev->lock);
996 if (copy_to_user (buf, dev->req->buf, len))
997 retval = -EFAULT;
1000 spin_lock_irq(&dev->lock);
1001 --dev->udc_usage;
1002 clean_req (dev->gadget->ep0, dev->req);
1010 if (len < sizeof dev->event [0]) {
1011 retval = -EINVAL;
1014 len -= len % sizeof (struct usb_gadgetfs_event);
1015 dev->usermode_setup = 1;
1019 if (dev->ev_next != 0) {
1023 if (dev->ev_next < n)
1024 n = dev->ev_next;
1028 if (dev->event [i].type == GADGETFS_SETUP) {
1029 dev->state = STATE_DEV_SETUP;
1034 spin_unlock_irq (&dev->lock);
1036 if (copy_to_user (buf, &dev->event, len))
1037 retval = -EFAULT;
1044 spin_lock_irq (&dev->lock);
1045 if (dev->ev_next > n) {
1046 memmove(&dev->event[0], &dev->event[n],
1048 * (dev->ev_next - n));
1050 dev->ev_next -= n;
1051 spin_unlock_irq (&dev->lock);
1055 if (fd->f_flags & O_NONBLOCK) {
1056 retval = -EAGAIN;
1060 switch (state) {
1062 DBG (dev, "fail %s, state %d\n", __func__, state);
1063 retval = -ESRCH;
1067 spin_unlock_irq (&dev->lock);
1071 retval = wait_event_interruptible (dev->wait,
1072 dev->ev_next != 0);
1075 spin_lock_irq (&dev->lock);
1080 spin_unlock_irq (&dev->lock);
1093 if (dev->state == STATE_DEV_SETUP)
1094 dev->setup_abort = 1;
1097 dev->ev_next = 0;
1102 for (i = 0; i != dev->ev_next; i++) {
1103 if (dev->event [i].type != type)
1106 dev->ev_next--;
1107 if (i == dev->ev_next)
1110 memmove (&dev->event [i], &dev->event [i + 1],
1112 * (dev->ev_next - i));
1118 VDEBUG(dev, "event[%d] = %d\n", dev->ev_next, type);
1119 event = &dev->event [dev->ev_next++];
1120 BUG_ON (dev->ev_next > N_EVENT);
1122 event->type = type;
1129 struct dev_data *dev = fd->private_data;
1130 ssize_t retval = -ESRCH;
1133 if (dev->setup_abort) {
1134 dev->setup_abort = 0;
1135 retval = -EIDRM;
1138 } else if (dev->state == STATE_DEV_SETUP) {
1140 len = min_t(size_t, len, dev->setup_wLength);
1141 if (dev->setup_in) {
1142 retval = setup_req (dev->gadget->ep0, dev->req, len);
1144 dev->state = STATE_DEV_CONNECTED;
1145 ++dev->udc_usage;
1146 spin_unlock_irq (&dev->lock);
1147 if (copy_from_user (dev->req->buf, buf, len))
1148 retval = -EFAULT;
1150 if (len < dev->setup_wLength)
1151 dev->req->zero = 1;
1153 dev->gadget->ep0, dev->req,
1156 spin_lock_irq(&dev->lock);
1157 --dev->udc_usage;
1159 clean_req (dev->gadget->ep0, dev->req);
1167 } else if (dev->setup_can_stall) {
1169 (void) usb_ep_set_halt (dev->gadget->ep0);
1170 retval = -EL2HLT;
1171 dev->state = STATE_DEV_CONNECTED;
1176 DBG (dev, "fail %s, state %d\n", __func__, dev->state);
1184 struct dev_data *dev = fd->private_data;
1187 return fasync_helper (f, fd, on, &dev->fasync);
1195 struct dev_data *dev = fd->private_data;
1199 if (dev->gadget_registered) {
1201 dev->gadget_registered = false;
1209 kfree (dev->buf);
1210 dev->buf = NULL;
1213 spin_lock_irq(&dev->lock);
1214 dev->state = STATE_DEV_DISABLED;
1215 spin_unlock_irq(&dev->lock);
1224 struct dev_data *dev = fd->private_data;
1227 if (dev->state <= STATE_DEV_OPENED)
1230 poll_wait(fd, &dev->wait, wait);
1232 spin_lock_irq(&dev->lock);
1235 if (dev->setup_abort) {
1236 dev->setup_abort = 0;
1241 if (dev->state == STATE_DEV_SETUP) {
1242 if (dev->setup_in || dev->setup_can_stall)
1245 if (dev->ev_next != 0)
1249 spin_unlock_irq(&dev->lock);
1255 struct dev_data *dev = fd->private_data;
1256 struct usb_gadget *gadget = dev->gadget;
1257 long ret = -ENOTTY;
1259 spin_lock_irq(&dev->lock);
1260 if (dev->state == STATE_DEV_OPENED ||
1261 dev->state == STATE_DEV_UNBOUND) {
1263 } else if (gadget->ops->ioctl) {
1264 ++dev->udc_usage;
1265 spin_unlock_irq(&dev->lock);
1267 ret = gadget->ops->ioctl (gadget, code, value);
1269 spin_lock_irq(&dev->lock);
1270 --dev->udc_usage;
1272 spin_unlock_irq(&dev->lock);
1277 /*----------------------------------------------------------------------*/
1279 /* The in-kernel gadget driver handles most ep0 issues, in particular
1294 desc = dev->dev;
1295 qual.bDeviceClass = desc->bDeviceClass;
1296 qual.bDeviceSubClass = desc->bDeviceSubClass;
1297 qual.bDeviceProtocol = desc->bDeviceProtocol;
1300 qual.bMaxPacketSize0 = dev->gadget->ep0->maxpacket;
1305 memcpy (dev->rbuf, &qual, sizeof qual);
1316 return -EINVAL;
1318 if (gadget_is_dualspeed(dev->gadget)) {
1319 hs = (dev->gadget->speed == USB_SPEED_HIGH);
1324 dev->req->buf = dev->hs_config;
1325 len = le16_to_cpu(dev->hs_config->wTotalLength);
1327 dev->req->buf = dev->config;
1328 len = le16_to_cpu(dev->config->wTotalLength);
1330 ((u8 *)dev->req->buf) [1] = type;
1338 struct usb_request *req = dev->req;
1339 int value = -EOPNOTSUPP;
1341 u16 w_value = le16_to_cpu(ctrl->wValue);
1342 u16 w_length = le16_to_cpu(ctrl->wLength);
1345 if (ctrl->bRequestType & USB_DIR_IN) {
1347 __le16 *temp = (__le16 *)&ctrl->wLength;
1356 spin_lock (&dev->lock);
1357 dev->setup_abort = 0;
1358 if (dev->state == STATE_DEV_UNCONNECTED) {
1360 && gadget->speed == USB_SPEED_HIGH
1361 && dev->hs_config == NULL) {
1362 spin_unlock(&dev->lock);
1364 return -EINVAL;
1367 dev->state = STATE_DEV_CONNECTED;
1371 event->u.speed = gadget->speed;
1379 } else if (dev->state == STATE_DEV_SETUP)
1380 dev->setup_abort = 1;
1382 req->buf = dev->rbuf;
1383 req->context = NULL;
1384 switch (ctrl->bRequest) {
1387 if (ctrl->bRequestType != USB_DIR_IN)
1392 value = min (w_length, (u16) sizeof *dev->dev);
1393 dev->dev->bMaxPacketSize0 = dev->gadget->ep0->maxpacket;
1394 req->buf = dev->dev;
1397 if (!dev->hs_config)
1421 if (ctrl->bRequestType != 0)
1425 dev->current_config = 0;
1432 && gadget->speed == USB_SPEED_HIGH) {
1433 config = dev->hs_config->bConfigurationValue;
1434 power = dev->hs_config->bMaxPower;
1436 config = dev->config->bConfigurationValue;
1437 power = dev->config->bMaxPower;
1442 dev->current_config = config;
1457 INFO (dev, "configuration #%d\n", dev->current_config);
1459 if (dev->usermode_setup) {
1460 dev->setup_can_stall = 0;
1469 if (ctrl->bRequestType != 0x80)
1471 *(u8 *)req->buf = dev->current_config;
1479 dev->usermode_setup ? "delegate" : "fail",
1480 ctrl->bRequestType, ctrl->bRequest,
1481 w_value, le16_to_cpu(ctrl->wIndex), w_length);
1484 if (dev->usermode_setup) {
1485 dev->setup_can_stall = 1;
1487 dev->setup_in = (ctrl->bRequestType & USB_DIR_IN)
1489 dev->setup_wLength = w_length;
1490 dev->setup_out_ready = 0;
1491 dev->setup_out_error = 0;
1494 if (unlikely (!dev->setup_in && w_length)) {
1495 value = setup_req (gadget->ep0, dev->req,
1500 ++dev->udc_usage;
1501 spin_unlock (&dev->lock);
1502 value = usb_ep_queue (gadget->ep0, dev->req,
1504 spin_lock (&dev->lock);
1505 --dev->udc_usage;
1507 clean_req (gadget->ep0, dev->req);
1512 dev->setup_can_stall = 0;
1515 /* state changes when reader collects event */
1517 event->u.setup = *ctrl;
1519 spin_unlock (&dev->lock);
1523 * proceeding with the status stage for 0-length
1534 if (value >= 0 && dev->state != STATE_DEV_SETUP) {
1535 req->length = value;
1536 req->zero = value < w_length;
1538 ++dev->udc_usage;
1539 spin_unlock (&dev->lock);
1540 value = usb_ep_queue (gadget->ep0, req, GFP_KERNEL);
1541 spin_lock(&dev->lock);
1542 --dev->udc_usage;
1543 spin_unlock(&dev->lock);
1545 DBG (dev, "ep_queue --> %d\n", value);
1546 req->status = 0;
1552 spin_unlock (&dev->lock);
1558 DBG (dev, "%s %d\n", __func__, dev->state);
1560 /* dev->state must prevent interference */
1561 spin_lock_irq (&dev->lock);
1562 while (!list_empty(&dev->epfiles)) {
1568 ep = list_first_entry (&dev->epfiles, struct ep_data, epfiles);
1569 list_del_init (&ep->epfiles);
1570 spin_unlock_irq (&dev->lock);
1572 dentry = ep->dentry;
1573 ep->dentry = NULL;
1574 parent = d_inode(dentry->d_parent);
1577 mutex_lock(&ep->lock);
1578 if (ep->state == STATE_EP_ENABLED)
1579 (void) usb_ep_disable (ep->ep);
1580 ep->state = STATE_EP_UNBOUND;
1581 usb_ep_free_request (ep->ep, ep->req);
1582 ep->ep = NULL;
1583 mutex_unlock(&ep->lock);
1585 wake_up (&ep->wait);
1594 spin_lock_irq (&dev->lock);
1596 spin_unlock_irq (&dev->lock);
1609 gadget_for_each_ep (ep, dev->gadget) {
1614 data->state = STATE_EP_DISABLED;
1615 mutex_init(&data->lock);
1616 init_waitqueue_head (&data->wait);
1618 strncpy (data->name, ep->name, sizeof (data->name) - 1);
1619 refcount_set (&data->count, 1);
1620 data->dev = dev;
1623 data->ep = ep;
1624 ep->driver_data = data;
1626 data->req = usb_ep_alloc_request (ep, GFP_KERNEL);
1627 if (!data->req)
1630 data->dentry = gadgetfs_create_file (dev->sb, data->name,
1632 if (!data->dentry)
1634 list_add_tail (&data->epfiles, &dev->epfiles);
1639 usb_ep_free_request (ep, data->req);
1646 return -ENOMEM;
1656 spin_lock_irq (&dev->lock);
1657 dev->state = STATE_DEV_UNBOUND;
1658 while (dev->udc_usage > 0) {
1659 spin_unlock_irq(&dev->lock);
1661 spin_lock_irq(&dev->lock);
1663 spin_unlock_irq (&dev->lock);
1666 gadget->ep0->driver_data = NULL;
1670 if (dev->req)
1671 usb_ep_free_request (gadget->ep0, dev->req);
1684 return -ESRCH;
1685 if (0 != strcmp (CHIP, gadget->name)) {
1687 shortname, CHIP, gadget->name);
1688 return -ENODEV;
1692 dev->gadget = gadget;
1693 gadget->ep0->driver_data = dev;
1696 dev->req = usb_ep_alloc_request (gadget->ep0, GFP_KERNEL);
1697 if (!dev->req)
1699 dev->req->context = NULL;
1700 dev->req->complete = epio_complete;
1705 INFO (dev, "bound to %s driver\n", gadget->name);
1706 spin_lock_irq(&dev->lock);
1707 dev->state = STATE_DEV_UNCONNECTED;
1708 spin_unlock_irq(&dev->lock);
1714 return -ENOMEM;
1723 spin_lock_irqsave (&dev->lock, flags);
1724 if (dev->state == STATE_DEV_UNCONNECTED)
1726 dev->state = STATE_DEV_UNCONNECTED;
1732 spin_unlock_irqrestore (&dev->lock, flags);
1741 INFO (dev, "suspended from state %d\n", dev->state);
1742 spin_lock_irqsave(&dev->lock, flags);
1743 switch (dev->state) {
1753 spin_unlock_irqrestore(&dev->lock, flags);
1770 /*----------------------------------------------------------------------*/
1781 * would change to support features like multi-config devices
1785 * this one's optional except for high-speed hardware
1800 return config->bDescriptorType == USB_DT_CONFIG
1801 && config->bLength == USB_DT_CONFIG_SIZE
1803 && config->bConfigurationValue != 0
1804 && (config->bmAttributes & USB_CONFIG_ATT_ONE) != 0
1805 && (config->bmAttributes & USB_CONFIG_ATT_WAKEUP) == 0;
1806 /* FIXME if gadget->is_otg, _must_ include an otg descriptor */
1813 struct dev_data *dev = fd->private_data;
1819 spin_lock_irq(&dev->lock);
1820 if (dev->state > STATE_DEV_OPENED) {
1822 spin_unlock_irq(&dev->lock);
1825 spin_unlock_irq(&dev->lock);
1829 return -EINVAL;
1833 return -EFAULT;
1835 return -EINVAL;
1837 length -= 4;
1843 spin_lock_irq (&dev->lock);
1844 value = -EINVAL;
1845 if (dev->buf) {
1846 spin_unlock_irq(&dev->lock);
1850 dev->buf = kbuf;
1853 dev->config = (void *) kbuf;
1854 total = le16_to_cpu(dev->config->wTotalLength);
1855 if (!is_valid_config(dev->config, total) ||
1856 total > length - USB_DT_DEVICE_SIZE)
1859 length -= total;
1863 dev->hs_config = (void *) kbuf;
1864 total = le16_to_cpu(dev->hs_config->wTotalLength);
1865 if (!is_valid_config(dev->hs_config, total) ||
1866 total > length - USB_DT_DEVICE_SIZE)
1869 length -= total;
1871 dev->hs_config = NULL;
1879 dev->dev = (void *)kbuf;
1880 if (dev->dev->bLength != USB_DT_DEVICE_SIZE
1881 || dev->dev->bDescriptorType != USB_DT_DEVICE
1882 || dev->dev->bNumConfigurations != 1)
1884 dev->dev->bcdUSB = cpu_to_le16 (0x0200);
1887 spin_unlock_irq (&dev->lock);
1888 if (dev->hs_config)
1895 spin_lock_irq(&dev->lock);
1900 * unplug/replug that will clear all the error state.
1908 dev->gadget_registered = true;
1913 dev->config = NULL;
1914 dev->hs_config = NULL;
1915 dev->dev = NULL;
1916 spin_unlock_irq (&dev->lock);
1918 kfree (dev->buf);
1919 dev->buf = NULL;
1926 struct dev_data *dev = inode->i_private;
1927 int value = -EBUSY;
1929 spin_lock_irq(&dev->lock);
1930 if (dev->state == STATE_DEV_DISABLED) {
1931 dev->ev_next = 0;
1932 dev->state = STATE_DEV_OPENED;
1933 fd->private_data = dev;
1937 spin_unlock_irq(&dev->lock);
1952 /*----------------------------------------------------------------------*/
1982 inode->i_ino = get_next_ino();
1983 inode->i_mode = mode;
1984 inode->i_uid = make_kuid(&init_user_ns, default_uid);
1985 inode->i_gid = make_kgid(&init_user_ns, default_gid);
1987 inode->i_private = data;
1988 inode->i_fop = fops;
1993 /* creates in fs root directory, so non-renamable and non-linkable.
2003 dentry = d_alloc_name(sb->s_root, name);
2032 rc = -ESRCH;
2038 rc = -ENODEV;
2043 sb->s_blocksize = PAGE_SIZE;
2044 sb->s_blocksize_bits = PAGE_SHIFT;
2045 sb->s_magic = GADGETFS_MAGIC;
2046 sb->s_op = &gadget_fs_operations;
2047 sb->s_time_gran = 1;
2055 inode->i_op = &simple_dir_inode_operations;
2056 if (!(sb->s_root = d_make_root (inode)))
2066 dev->sb = sb;
2067 dev->dentry = gadgetfs_create_file(sb, CHIP, dev, &ep0_operations);
2068 if (!dev->dentry) {
2083 rc = -ENOMEM;
2090 /* "mount -t gadgetfs path /dev/gadget" ends up here */
2102 fc->ops = &gadgetfs_context_ops;
2120 /*----------------------------------------------------------------------*/
2130 /*----------------------------------------------------------------------*/