Lines Matching refs:usblp
131 struct usblp { struct
168 static void usblp_dump(struct usblp *usblp) in usblp_dump() argument
170 struct device *dev = &usblp->intf->dev; in usblp_dump()
173 dev_dbg(dev, "usblp=0x%p\n", usblp); in usblp_dump()
174 dev_dbg(dev, "dev=0x%p\n", usblp->dev); in usblp_dump()
175 dev_dbg(dev, "present=%d\n", usblp->present); in usblp_dump()
176 dev_dbg(dev, "readbuf=0x%p\n", usblp->readbuf); in usblp_dump()
177 dev_dbg(dev, "readcount=%d\n", usblp->readcount); in usblp_dump()
178 dev_dbg(dev, "ifnum=%d\n", usblp->ifnum); in usblp_dump()
181 usblp->protocol[p].alt_setting); in usblp_dump()
183 usblp->protocol[p].epwrite); in usblp_dump()
185 usblp->protocol[p].epread); in usblp_dump()
187 dev_dbg(dev, "current_protocol=%d\n", usblp->current_protocol); in usblp_dump()
188 dev_dbg(dev, "minor=%d\n", usblp->minor); in usblp_dump()
189 dev_dbg(dev, "wstatus=%d\n", usblp->wstatus); in usblp_dump()
190 dev_dbg(dev, "rstatus=%d\n", usblp->rstatus); in usblp_dump()
191 dev_dbg(dev, "quirks=%d\n", usblp->quirks); in usblp_dump()
192 dev_dbg(dev, "used=%d\n", usblp->used); in usblp_dump()
193 dev_dbg(dev, "bidir=%d\n", usblp->bidir); in usblp_dump()
195 usblp->device_id_string ? in usblp_dump()
196 usblp->device_id_string + 2 : in usblp_dump()
233 static int usblp_wwait(struct usblp *usblp, int nonblock);
234 static int usblp_wtest(struct usblp *usblp, int nonblock);
235 static int usblp_rwait_and_lock(struct usblp *usblp, int nonblock);
236 static int usblp_rtest(struct usblp *usblp, int nonblock);
237 static int usblp_submit_read(struct usblp *usblp);
238 static int usblp_select_alts(struct usblp *usblp);
239 static int usblp_set_protocol(struct usblp *usblp, int protocol);
240 static int usblp_cache_device_id_string(struct usblp *usblp);
250 static int usblp_ctrl_msg(struct usblp *usblp, int request, int type, int dir, int recip, int value… in usblp_ctrl_msg() argument
253 int index = usblp->ifnum; in usblp_ctrl_msg()
259 index = (usblp->ifnum<<8)|usblp->protocol[usblp->current_protocol].alt_setting; in usblp_ctrl_msg()
261 retval = usb_control_msg(usblp->dev, in usblp_ctrl_msg()
262 dir ? usb_rcvctrlpipe(usblp->dev, 0) : usb_sndctrlpipe(usblp->dev, 0), in usblp_ctrl_msg()
264 dev_dbg(&usblp->intf->dev, in usblp_ctrl_msg()
270 #define usblp_read_status(usblp, status)\ argument
271 …usblp_ctrl_msg(usblp, USBLP_REQ_GET_STATUS, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, 0, st…
272 #define usblp_get_id(usblp, config, id, maxlen)\ argument
273 …usblp_ctrl_msg(usblp, USBLP_REQ_GET_ID, USB_TYPE_CLASS, USB_DIR_IN, USB_RECIP_INTERFACE, config, i…
274 #define usblp_reset(usblp)\ argument
275 usblp_ctrl_msg(usblp, USBLP_REQ_RESET, USB_TYPE_CLASS, USB_DIR_OUT, USB_RECIP_OTHER, 0, NULL, 0)
277 #define usblp_hp_channel_change_request(usblp, channel, buffer) \ argument
278 …usblp_ctrl_msg(usblp, USBLP_REQ_HP_CHANNEL_CHANGE_REQUEST, USB_TYPE_VENDOR, USB_DIR_IN, USB_RECIP_…
293 struct usblp *usblp = urb->context; in usblp_bulk_read() local
297 if (usblp->present && usblp->used) { in usblp_bulk_read()
301 usblp->minor, status); in usblp_bulk_read()
303 spin_lock_irqsave(&usblp->lock, flags); in usblp_bulk_read()
305 usblp->rstatus = status; in usblp_bulk_read()
307 usblp->rstatus = urb->actual_length; in usblp_bulk_read()
308 usblp->rcomplete = 1; in usblp_bulk_read()
309 wake_up(&usblp->rwait); in usblp_bulk_read()
310 spin_unlock_irqrestore(&usblp->lock, flags); in usblp_bulk_read()
317 struct usblp *usblp = urb->context; in usblp_bulk_write() local
321 if (usblp->present && usblp->used) { in usblp_bulk_write()
325 usblp->minor, status); in usblp_bulk_write()
327 spin_lock_irqsave(&usblp->lock, flags); in usblp_bulk_write()
329 usblp->wstatus = status; in usblp_bulk_write()
331 usblp->wstatus = urb->actual_length; in usblp_bulk_write()
332 usblp->no_paper = 0; in usblp_bulk_write()
333 usblp->wcomplete = 1; in usblp_bulk_write()
334 wake_up(&usblp->wwait); in usblp_bulk_write()
335 spin_unlock_irqrestore(&usblp->lock, flags); in usblp_bulk_write()
346 static int usblp_check_status(struct usblp *usblp, int err) in usblp_check_status() argument
351 mutex_lock(&usblp->mut); in usblp_check_status()
352 if ((error = usblp_read_status(usblp, usblp->statusbuf)) < 0) { in usblp_check_status()
353 mutex_unlock(&usblp->mut); in usblp_check_status()
356 usblp->minor, error); in usblp_check_status()
359 status = *usblp->statusbuf; in usblp_check_status()
360 mutex_unlock(&usblp->mut); in usblp_check_status()
371 usblp->minor, usblp_messages[newerr]); in usblp_check_status()
377 static int handle_bidir(struct usblp *usblp) in handle_bidir() argument
379 if (usblp->bidir && usblp->used) { in handle_bidir()
380 if (usblp_submit_read(usblp) < 0) in handle_bidir()
393 struct usblp *usblp; in usblp_open() local
406 usblp = usb_get_intfdata(intf); in usblp_open()
407 if (!usblp || !usblp->dev || !usblp->present) in usblp_open()
411 if (usblp->used) in usblp_open()
423 usblp->used = 1; in usblp_open()
424 file->private_data = usblp; in usblp_open()
426 usblp->wcomplete = 1; /* we begin writeable */ in usblp_open()
427 usblp->wstatus = 0; in usblp_open()
428 usblp->rcomplete = 0; in usblp_open()
430 if (handle_bidir(usblp) < 0) { in usblp_open()
432 usblp->used = 0; in usblp_open()
441 static void usblp_cleanup(struct usblp *usblp) in usblp_cleanup() argument
443 printk(KERN_INFO "usblp%d: removed\n", usblp->minor); in usblp_cleanup()
445 kfree(usblp->readbuf); in usblp_cleanup()
446 kfree(usblp->device_id_string); in usblp_cleanup()
447 kfree(usblp->statusbuf); in usblp_cleanup()
448 kfree(usblp); in usblp_cleanup()
451 static void usblp_unlink_urbs(struct usblp *usblp) in usblp_unlink_urbs() argument
453 usb_kill_anchored_urbs(&usblp->urbs); in usblp_unlink_urbs()
458 struct usblp *usblp = file->private_data; in usblp_release() local
460 usblp->flags &= ~LP_ABORT; in usblp_release()
463 usblp->used = 0; in usblp_release()
464 if (usblp->present) { in usblp_release()
465 usblp_unlink_urbs(usblp); in usblp_release()
466 usb_autopm_put_interface(usblp->intf); in usblp_release()
468 usblp_cleanup(usblp); in usblp_release()
479 struct usblp *usblp = file->private_data; in usblp_poll() local
481 poll_wait(file, &usblp->rwait, wait); in usblp_poll()
482 poll_wait(file, &usblp->wwait, wait); in usblp_poll()
483 spin_lock_irqsave(&usblp->lock, flags); in usblp_poll()
484 ret = ((usblp->bidir && usblp->rcomplete) ? EPOLLIN | EPOLLRDNORM : 0) | in usblp_poll()
485 ((usblp->no_paper || usblp->wcomplete) ? EPOLLOUT | EPOLLWRNORM : 0); in usblp_poll()
486 spin_unlock_irqrestore(&usblp->lock, flags); in usblp_poll()
492 struct usblp *usblp = file->private_data; in usblp_ioctl() local
499 mutex_lock(&usblp->mut); in usblp_ioctl()
500 if (!usblp->present) { in usblp_ioctl()
505 dev_dbg(&usblp->intf->dev, in usblp_ioctl()
519 length = usblp_cache_device_id_string(usblp); in usblp_ioctl()
528 usblp->device_id_string, in usblp_ioctl()
543 twoints[0] = usblp->current_protocol; in usblp_ioctl()
547 if (usblp->protocol[i].alt_setting >= 0) in usblp_ioctl()
568 usblp_dump(usblp); in usblp_ioctl()
573 usblp_unlink_urbs(usblp); in usblp_ioctl()
574 retval = usblp_set_protocol(usblp, arg); in usblp_ioctl()
576 usblp_set_protocol(usblp, in usblp_ioctl()
577 usblp->current_protocol); in usblp_ioctl()
583 le16_to_cpu(usblp->dev->descriptor.idVendor) != 0x03F0 || in usblp_ioctl()
584 usblp->quirks & USBLP_QUIRK_BIDIR) { in usblp_ioctl()
589 err = usblp_hp_channel_change_request(usblp, in usblp_ioctl()
592 dev_err(&usblp->dev->dev, in usblp_ioctl()
595 usblp->minor, err); in usblp_ioctl()
600 dev_dbg(&usblp->intf->dev, in usblp_ioctl()
602 usblp->minor, arg, newChannel); in usblp_ioctl()
612 twoints[0] = usblp->dev->bus->busnum; in usblp_ioctl()
613 twoints[1] = usblp->dev->devnum; in usblp_ioctl()
621 dev_dbg(&usblp->intf->dev, in usblp_ioctl()
623 usblp->minor, twoints[0], twoints[1]); in usblp_ioctl()
633 twoints[0] = le16_to_cpu(usblp->dev->descriptor.idVendor); in usblp_ioctl()
634 twoints[1] = le16_to_cpu(usblp->dev->descriptor.idProduct); in usblp_ioctl()
642 dev_dbg(&usblp->intf->dev, in usblp_ioctl()
644 usblp->minor, twoints[0], twoints[1]); in usblp_ioctl()
652 retval = usblp_reset(usblp); in usblp_ioctl()
661 retval = usblp_read_status(usblp, usblp->statusbuf); in usblp_ioctl()
665 usblp->minor, retval); in usblp_ioctl()
669 status = *usblp->statusbuf; in usblp_ioctl()
676 usblp->flags |= LP_ABORT; in usblp_ioctl()
678 usblp->flags &= ~LP_ABORT; in usblp_ioctl()
686 mutex_unlock(&usblp->mut); in usblp_ioctl()
690 static struct urb *usblp_new_writeurb(struct usblp *usblp, int transfer_length) in usblp_new_writeurb() argument
704 usb_fill_bulk_urb(urb, usblp->dev, in usblp_new_writeurb()
705 usb_sndbulkpipe(usblp->dev, in usblp_new_writeurb()
706 usblp->protocol[usblp->current_protocol].epwrite->bEndpointAddress), in usblp_new_writeurb()
707 writebuf, transfer_length, usblp_bulk_write, usblp); in usblp_new_writeurb()
715 struct usblp *usblp = file->private_data; in usblp_write() local
721 if (mutex_lock_interruptible(&usblp->wmut)) { in usblp_write()
725 if ((rv = usblp_wwait(usblp, !!(file->f_flags & O_NONBLOCK))) < 0) in usblp_write()
736 writeurb = usblp_new_writeurb(usblp, transfer_length); in usblp_write()
739 usb_anchor_urb(writeurb, &usblp->urbs); in usblp_write()
747 spin_lock_irq(&usblp->lock); in usblp_write()
748 usblp->wcomplete = 0; in usblp_write()
749 spin_unlock_irq(&usblp->lock); in usblp_write()
751 usblp->wstatus = 0; in usblp_write()
752 spin_lock_irq(&usblp->lock); in usblp_write()
753 usblp->no_paper = 0; in usblp_write()
754 usblp->wcomplete = 1; in usblp_write()
755 wake_up(&usblp->wwait); in usblp_write()
756 spin_unlock_irq(&usblp->lock); in usblp_write()
765 rv = usblp_wwait(usblp, !!(file->f_flags&O_NONBLOCK)); in usblp_write()
772 spin_lock_irq(&usblp->lock); in usblp_write()
773 usblp->no_paper = 1; /* Mark for poll(2) */ in usblp_write()
774 spin_unlock_irq(&usblp->lock); in usblp_write()
781 if (usblp->wstatus < 0) { in usblp_write()
789 writecount += usblp->wstatus; in usblp_write()
792 mutex_unlock(&usblp->wmut); in usblp_write()
802 mutex_unlock(&usblp->wmut); in usblp_write()
814 struct usblp *usblp = file->private_data; in usblp_read() local
819 if (!usblp->bidir) in usblp_read()
822 rv = usblp_rwait_and_lock(usblp, !!(file->f_flags & O_NONBLOCK)); in usblp_read()
826 if ((avail = usblp->rstatus) < 0) { in usblp_read()
828 usblp->minor, (int)avail); in usblp_read()
829 usblp_submit_read(usblp); in usblp_read()
834 count = len < avail - usblp->readcount ? len : avail - usblp->readcount; in usblp_read()
836 copy_to_user(buffer, usblp->readbuf + usblp->readcount, count)) { in usblp_read()
841 if ((usblp->readcount += count) == avail) { in usblp_read()
842 if (usblp_submit_read(usblp) < 0) { in usblp_read()
851 mutex_unlock(&usblp->mut); in usblp_read()
866 static int usblp_wwait(struct usblp *usblp, int nonblock) in usblp_wwait() argument
872 add_wait_queue(&usblp->wwait, &waita); in usblp_wwait()
874 if (mutex_lock_interruptible(&usblp->mut)) { in usblp_wwait()
879 rc = usblp_wtest(usblp, nonblock); in usblp_wwait()
880 mutex_unlock(&usblp->mut); in usblp_wwait()
885 if (usblp->flags & LP_ABORT) { in usblp_wwait()
886 err = usblp_check_status(usblp, err); in usblp_wwait()
893 mutex_lock(&usblp->mut); in usblp_wwait()
894 usblp_read_status(usblp, usblp->statusbuf); in usblp_wwait()
895 mutex_unlock(&usblp->mut); in usblp_wwait()
900 remove_wait_queue(&usblp->wwait, &waita); in usblp_wwait()
904 static int usblp_wtest(struct usblp *usblp, int nonblock) in usblp_wtest() argument
908 if (!usblp->present) in usblp_wtest()
912 spin_lock_irqsave(&usblp->lock, flags); in usblp_wtest()
913 if (usblp->wcomplete) { in usblp_wtest()
914 spin_unlock_irqrestore(&usblp->lock, flags); in usblp_wtest()
917 spin_unlock_irqrestore(&usblp->lock, flags); in usblp_wtest()
930 static int usblp_rwait_and_lock(struct usblp *usblp, int nonblock) in usblp_rwait_and_lock() argument
935 add_wait_queue(&usblp->rwait, &waita); in usblp_rwait_and_lock()
937 if (mutex_lock_interruptible(&usblp->mut)) { in usblp_rwait_and_lock()
942 if ((rc = usblp_rtest(usblp, nonblock)) < 0) { in usblp_rwait_and_lock()
943 mutex_unlock(&usblp->mut); in usblp_rwait_and_lock()
948 mutex_unlock(&usblp->mut); in usblp_rwait_and_lock()
952 remove_wait_queue(&usblp->rwait, &waita); in usblp_rwait_and_lock()
956 static int usblp_rtest(struct usblp *usblp, int nonblock) in usblp_rtest() argument
960 if (!usblp->present) in usblp_rtest()
964 spin_lock_irqsave(&usblp->lock, flags); in usblp_rtest()
965 if (usblp->rcomplete) { in usblp_rtest()
966 spin_unlock_irqrestore(&usblp->lock, flags); in usblp_rtest()
969 spin_unlock_irqrestore(&usblp->lock, flags); in usblp_rtest()
978 static int usblp_submit_read(struct usblp *usblp) in usblp_submit_read() argument
989 usb_fill_bulk_urb(urb, usblp->dev, in usblp_submit_read()
990 usb_rcvbulkpipe(usblp->dev, in usblp_submit_read()
991 usblp->protocol[usblp->current_protocol].epread->bEndpointAddress), in usblp_submit_read()
992 usblp->readbuf, USBLP_BUF_SIZE_IN, in usblp_submit_read()
993 usblp_bulk_read, usblp); in usblp_submit_read()
994 usb_anchor_urb(urb, &usblp->urbs); in usblp_submit_read()
996 spin_lock_irqsave(&usblp->lock, flags); in usblp_submit_read()
997 usblp->readcount = 0; /* XXX Why here? */ in usblp_submit_read()
998 usblp->rcomplete = 0; in usblp_submit_read()
999 spin_unlock_irqrestore(&usblp->lock, flags); in usblp_submit_read()
1001 dev_dbg(&usblp->intf->dev, "error submitting urb (%d)\n", rc); in usblp_submit_read()
1002 spin_lock_irqsave(&usblp->lock, flags); in usblp_submit_read()
1003 usblp->rstatus = rc; in usblp_submit_read()
1004 usblp->rcomplete = 1; in usblp_submit_read()
1005 spin_unlock_irqrestore(&usblp->lock, flags); in usblp_submit_read()
1074 struct usblp *usblp = usb_get_intfdata(intf); in ieee1284_id_show() local
1076 if (usblp->device_id_string[0] == 0 && in ieee1284_id_show()
1077 usblp->device_id_string[1] == 0) in ieee1284_id_show()
1080 return sprintf(buf, "%s", usblp->device_id_string+2); in ieee1284_id_show()
1089 struct usblp *usblp; in usblp_probe() local
1095 usblp = kzalloc(sizeof(struct usblp), GFP_KERNEL); in usblp_probe()
1096 if (!usblp) { in usblp_probe()
1100 usblp->dev = dev; in usblp_probe()
1101 mutex_init(&usblp->wmut); in usblp_probe()
1102 mutex_init(&usblp->mut); in usblp_probe()
1103 spin_lock_init(&usblp->lock); in usblp_probe()
1104 init_waitqueue_head(&usblp->rwait); in usblp_probe()
1105 init_waitqueue_head(&usblp->wwait); in usblp_probe()
1106 init_usb_anchor(&usblp->urbs); in usblp_probe()
1107 usblp->ifnum = intf->cur_altsetting->desc.bInterfaceNumber; in usblp_probe()
1108 usblp->intf = intf; in usblp_probe()
1113 if (!(usblp->device_id_string = kmalloc(USBLP_DEVICE_ID_SIZE, GFP_KERNEL))) { in usblp_probe()
1123 if (!(usblp->readbuf = kmalloc(USBLP_BUF_SIZE_IN, GFP_KERNEL))) { in usblp_probe()
1129 usblp->statusbuf = kmalloc(STATUS_BUF_SIZE, GFP_KERNEL); in usblp_probe()
1130 if (!usblp->statusbuf) { in usblp_probe()
1136 usblp->quirks = usblp_quirks( in usblp_probe()
1141 protocol = usblp_select_alts(usblp); in usblp_probe()
1152 if (usblp_set_protocol(usblp, protocol) < 0) { in usblp_probe()
1158 usblp_cache_device_id_string(usblp); in usblp_probe()
1164 usblp_check_status(usblp, 0); in usblp_probe()
1167 usb_set_intfdata(intf, usblp); in usblp_probe()
1169 usblp->present = 1; in usblp_probe()
1178 usblp->minor = intf->minor; in usblp_probe()
1181 usblp->minor, usblp->bidir ? "Bi" : "Uni", dev->devnum, in usblp_probe()
1182 usblp->ifnum, in usblp_probe()
1183 usblp->protocol[usblp->current_protocol].alt_setting, in usblp_probe()
1184 usblp->current_protocol, in usblp_probe()
1185 le16_to_cpu(usblp->dev->descriptor.idVendor), in usblp_probe()
1186 le16_to_cpu(usblp->dev->descriptor.idProduct)); in usblp_probe()
1194 kfree(usblp->readbuf); in usblp_probe()
1195 kfree(usblp->statusbuf); in usblp_probe()
1196 kfree(usblp->device_id_string); in usblp_probe()
1197 kfree(usblp); in usblp_probe()
1225 static int usblp_select_alts(struct usblp *usblp) in usblp_select_alts() argument
1233 if_alt = usblp->intf; in usblp_select_alts()
1236 usblp->protocol[p].alt_setting = -1; in usblp_select_alts()
1244 if (!(usblp->quirks & USBLP_QUIRK_BAD_CLASS)) in usblp_select_alts()
1265 if (usblp->quirks & USBLP_QUIRK_BIDIR) { in usblp_select_alts()
1268 usblp->minor); in usblp_select_alts()
1272 usblp->protocol[ifd->desc.bInterfaceProtocol].alt_setting = in usblp_select_alts()
1274 usblp->protocol[ifd->desc.bInterfaceProtocol].epwrite = epwrite; in usblp_select_alts()
1275 usblp->protocol[ifd->desc.bInterfaceProtocol].epread = epread; in usblp_select_alts()
1281 usblp->protocol[proto_bias].alt_setting != -1) in usblp_select_alts()
1285 if (usblp->protocol[2].alt_setting != -1) in usblp_select_alts()
1287 if (usblp->protocol[1].alt_setting != -1) in usblp_select_alts()
1289 if (usblp->protocol[3].alt_setting != -1) in usblp_select_alts()
1296 static int usblp_set_protocol(struct usblp *usblp, int protocol) in usblp_set_protocol() argument
1303 alts = usblp->protocol[protocol].alt_setting; in usblp_set_protocol()
1306 r = usb_set_interface(usblp->dev, usblp->ifnum, alts); in usblp_set_protocol()
1309 alts, usblp->ifnum); in usblp_set_protocol()
1313 usblp->bidir = (usblp->protocol[protocol].epread != NULL); in usblp_set_protocol()
1314 usblp->current_protocol = protocol; in usblp_set_protocol()
1315 dev_dbg(&usblp->intf->dev, "usblp%d set protocol %d\n", in usblp_set_protocol()
1316 usblp->minor, protocol); in usblp_set_protocol()
1323 static int usblp_cache_device_id_string(struct usblp *usblp) in usblp_cache_device_id_string() argument
1327 err = usblp_get_id(usblp, 0, usblp->device_id_string, USBLP_DEVICE_ID_SIZE - 1); in usblp_cache_device_id_string()
1329 dev_dbg(&usblp->intf->dev, in usblp_cache_device_id_string()
1331 usblp->minor, err); in usblp_cache_device_id_string()
1332 usblp->device_id_string[0] = usblp->device_id_string[1] = '\0'; in usblp_cache_device_id_string()
1339 length = be16_to_cpu(*((__be16 *)usblp->device_id_string)); in usblp_cache_device_id_string()
1344 usblp->device_id_string[length] = '\0'; in usblp_cache_device_id_string()
1346 dev_dbg(&usblp->intf->dev, "usblp%d Device ID string [len=%d]=\"%s\"\n", in usblp_cache_device_id_string()
1347 usblp->minor, length, &usblp->device_id_string[2]); in usblp_cache_device_id_string()
1354 struct usblp *usblp = usb_get_intfdata(intf); in usblp_disconnect() local
1358 if (!usblp || !usblp->dev) { in usblp_disconnect()
1366 mutex_lock(&usblp->mut); in usblp_disconnect()
1367 usblp->present = 0; in usblp_disconnect()
1368 wake_up(&usblp->wwait); in usblp_disconnect()
1369 wake_up(&usblp->rwait); in usblp_disconnect()
1372 usblp_unlink_urbs(usblp); in usblp_disconnect()
1373 mutex_unlock(&usblp->mut); in usblp_disconnect()
1375 if (!usblp->used) in usblp_disconnect()
1376 usblp_cleanup(usblp); in usblp_disconnect()
1382 struct usblp *usblp = usb_get_intfdata(intf); in usblp_suspend() local
1384 usblp_unlink_urbs(usblp); in usblp_suspend()
1387 wake_up(&usblp->wwait); in usblp_suspend()
1388 wake_up(&usblp->rwait); in usblp_suspend()
1396 struct usblp *usblp = usb_get_intfdata(intf); in usblp_resume() local
1399 r = handle_bidir(usblp); in usblp_resume()