wusb: add the Wire Adapter (WA) core
Common code for supporting Host Wire Adapters and Device Wire Adapters.
Signed-off-by: David Vrabel <david.vrabel@csr.com>
diff --git a/drivers/usb/wusbcore/Makefile b/drivers/usb/wusbcore/Makefile
index 6504f42..7a4d007 100644
--- a/drivers/usb/wusbcore/Makefile
+++ b/drivers/usb/wusbcore/Makefile
@@ -1,4 +1,5 @@
obj-$(CONFIG_USB_WUSB) += wusbcore.o wusb-cbaf.o
+obj-$(CONFIG_USB_HWA_HCD) += wusb-wa.o
wusbcore-objs := \
crypto.o \
@@ -12,3 +13,8 @@
wusbhc.o
wusb-cbaf-objs := cbaf.o
+
+wusb-wa-objs := wa-hc.o \
+ wa-nep.o \
+ wa-rpipe.o \
+ wa-xfer.o
diff --git a/drivers/usb/wusbcore/wa-hc.c b/drivers/usb/wusbcore/wa-hc.c
new file mode 100644
index 0000000..9d04722
--- /dev/null
+++ b/drivers/usb/wusbcore/wa-hc.c
@@ -0,0 +1,95 @@
+/*
+ * Wire Adapter Host Controller Driver
+ * Common items to HWA and DWA based HCDs
+ *
+ * Copyright (C) 2005-2006 Intel Corporation
+ * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version
+ * 2 as published by the Free Software Foundation.
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ *
+ *
+ * FIXME: docs
+ */
+#include "wusbhc.h"
+#include "wa-hc.h"
+
+/**
+ * Assumes
+ *
+ * wa->usb_dev and wa->usb_iface initialized and refcounted,
+ * wa->wa_descr initialized.
+ */
+int wa_create(struct wahc *wa, struct usb_interface *iface)
+{
+ int result;
+ struct device *dev = &iface->dev;
+
+ result = wa_rpipes_create(wa);
+ if (result < 0)
+ goto error_rpipes_create;
+ /* Fill up Data Transfer EP pointers */
+ wa->dti_epd = &iface->cur_altsetting->endpoint[1].desc;
+ wa->dto_epd = &iface->cur_altsetting->endpoint[2].desc;
+ wa->xfer_result_size = le16_to_cpu(wa->dti_epd->wMaxPacketSize);
+ wa->xfer_result = kmalloc(wa->xfer_result_size, GFP_KERNEL);
+ if (wa->xfer_result == NULL)
+ goto error_xfer_result_alloc;
+ result = wa_nep_create(wa, iface);
+ if (result < 0) {
+ dev_err(dev, "WA-CDS: can't initialize notif endpoint: %d\n",
+ result);
+ goto error_nep_create;
+ }
+ return 0;
+
+error_nep_create:
+ kfree(wa->xfer_result);
+error_xfer_result_alloc:
+ wa_rpipes_destroy(wa);
+error_rpipes_create:
+ return result;
+}
+EXPORT_SYMBOL_GPL(wa_create);
+
+
+void __wa_destroy(struct wahc *wa)
+{
+ if (wa->dti_urb) {
+ usb_kill_urb(wa->dti_urb);
+ usb_put_urb(wa->dti_urb);
+ usb_kill_urb(wa->buf_in_urb);
+ usb_put_urb(wa->buf_in_urb);
+ }
+ kfree(wa->xfer_result);
+ wa_nep_destroy(wa);
+ wa_rpipes_destroy(wa);
+}
+EXPORT_SYMBOL_GPL(__wa_destroy);
+
+/**
+ * wa_reset_all - reset the WA device
+ * @wa: the WA to be reset
+ *
+ * For HWAs the radio controller and all other PALs are also reset.
+ */
+void wa_reset_all(struct wahc *wa)
+{
+ /* FIXME: assuming HWA. */
+ wusbhc_reset_all(wa->wusb);
+}
+
+MODULE_AUTHOR("Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>");
+MODULE_DESCRIPTION("Wireless USB Wire Adapter core");
+MODULE_LICENSE("GPL");
diff --git a/drivers/usb/wusbcore/wa-hc.h b/drivers/usb/wusbcore/wa-hc.h
new file mode 100644
index 0000000..586d350
--- /dev/null
+++ b/drivers/usb/wusbcore/wa-hc.h
@@ -0,0 +1,417 @@
+/*
+ * HWA Host Controller Driver
+ * Wire Adapter Control/Data Streaming Iface (WUSB1.0[8])
+ *
+ * Copyright (C) 2005-2006 Intel Corporation
+ * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version
+ * 2 as published by the Free Software Foundation.
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ *
+ *
+ * This driver implements a USB Host Controller (struct usb_hcd) for a
+ * Wireless USB Host Controller based on the Wireless USB 1.0
+ * Host-Wire-Adapter specification (in layman terms, a USB-dongle that
+ * implements a Wireless USB host).
+ *
+ * Check out the Design-overview.txt file in the source documentation
+ * for other details on the implementation.
+ *
+ * Main blocks:
+ *
+ * driver glue with the driver API, workqueue daemon
+ *
+ * lc RC instance life cycle management (create, destroy...)
+ *
+ * hcd glue with the USB API Host Controller Interface API.
+ *
+ * nep Notification EndPoint managent: collect notifications
+ * and queue them with the workqueue daemon.
+ *
+ * Handle notifications as coming from the NEP. Sends them
+ * off others to their respective modules (eg: connect,
+ * disconnect and reset go to devconnect).
+ *
+ * rpipe Remote Pipe management; rpipe is what we use to write
+ * to an endpoint on a WUSB device that is connected to a
+ * HWA RC.
+ *
+ * xfer Transfer managment -- this is all the code that gets a
+ * buffer and pushes it to a device (or viceversa). *
+ *
+ * Some day a lot of this code will be shared between this driver and
+ * the drivers for DWA (xfer, rpipe).
+ *
+ * All starts at driver.c:hwahc_probe(), when one of this guys is
+ * connected. hwahc_disconnect() stops it.
+ *
+ * During operation, the main driver is devices connecting or
+ * disconnecting. They cause the HWA RC to send notifications into
+ * nep.c:hwahc_nep_cb() that will dispatch them to
+ * notif.c:wa_notif_dispatch(). From there they will fan to cause
+ * device connects, disconnects, etc.
+ *
+ * Note much of the activity is difficult to follow. For example a
+ * device connect goes to devconnect, which will cause the "fake" root
+ * hub port to show a connect and stop there. Then khubd will notice
+ * and call into the rh.c:hwahc_rc_port_reset() code to authenticate
+ * the device (and this might require user intervention) and enable
+ * the port.
+ *
+ * We also have a timer workqueue going from devconnect.c that
+ * schedules in hwahc_devconnect_create().
+ *
+ * The rest of the traffic is in the usual entry points of a USB HCD,
+ * which are hooked up in driver.c:hwahc_rc_driver, and defined in
+ * hcd.c.
+ */
+
+#ifndef __HWAHC_INTERNAL_H__
+#define __HWAHC_INTERNAL_H__
+
+#include <linux/completion.h>
+#include <linux/usb.h>
+#include <linux/mutex.h>
+#include <linux/spinlock.h>
+#include <linux/uwb.h>
+#include <linux/usb/wusb.h>
+#include <linux/usb/wusb-wa.h>
+
+struct wusbhc;
+struct wahc;
+extern void wa_urb_enqueue_run(struct work_struct *ws);
+
+/**
+ * RPipe instance
+ *
+ * @descr's fields are kept in LE, as we need to send it back and
+ * forth.
+ *
+ * @wa is referenced when set
+ *
+ * @segs_available is the number of requests segments that still can
+ * be submitted to the controller without overloading
+ * it. It is initialized to descr->wRequests when
+ * aiming.
+ *
+ * A rpipe supports a max of descr->wRequests at the same time; before
+ * submitting seg_lock has to be taken. If segs_avail > 0, then we can
+ * submit; if not, we have to queue them.
+ */
+struct wa_rpipe {
+ struct kref refcnt;
+ struct usb_rpipe_descriptor descr;
+ struct usb_host_endpoint *ep;
+ struct wahc *wa;
+ spinlock_t seg_lock;
+ struct list_head seg_list;
+ atomic_t segs_available;
+ u8 buffer[1]; /* For reads/writes on USB */
+};
+
+
+/**
+ * Instance of a HWA Host Controller
+ *
+ * Except where a more specific lock/mutex applies or atomic, all
+ * fields protected by @mutex.
+ *
+ * @wa_descr Can be accessed without locking because it is in
+ * the same area where the device descriptors were
+ * read, so it is guaranteed to exist umodified while
+ * the device exists.
+ *
+ * Endianess has been converted to CPU's.
+ *
+ * @nep_* can be accessed without locking as its processing is
+ * serialized; we submit a NEP URB and it comes to
+ * hwahc_nep_cb(), which won't issue another URB until it is
+ * done processing it.
+ *
+ * @xfer_list:
+ *
+ * List of active transfers to verify existence from a xfer id
+ * gotten from the xfer result message. Can't use urb->list because
+ * it goes by endpoint, and we don't know the endpoint at the time
+ * when we get the xfer result message. We can't really rely on the
+ * pointer (will have to change for 64 bits) as the xfer id is 32 bits.
+ *
+ * @xfer_delayed_list: List of transfers that need to be started
+ * (with a workqueue, because they were
+ * submitted from an atomic context).
+ *
+ * FIXME: this needs to be layered up: a wusbhc layer (for sharing
+ * comonalities with WHCI), a wa layer (for sharing
+ * comonalities with DWA-RC).
+ */
+struct wahc {
+ struct usb_device *usb_dev;
+ struct usb_interface *usb_iface;
+
+ /* HC to deliver notifications */
+ union {
+ struct wusbhc *wusb;
+ struct dwahc *dwa;
+ };
+
+ const struct usb_endpoint_descriptor *dto_epd, *dti_epd;
+ const struct usb_wa_descriptor *wa_descr;
+
+ struct urb *nep_urb; /* Notification EndPoint [lockless] */
+ struct edc nep_edc;
+ void *nep_buffer;
+ size_t nep_buffer_size;
+
+ atomic_t notifs_queued;
+
+ u16 rpipes;
+ unsigned long *rpipe_bm; /* rpipe usage bitmap */
+ spinlock_t rpipe_bm_lock; /* protect rpipe_bm */
+ struct mutex rpipe_mutex; /* assigning resources to endpoints */
+
+ struct urb *dti_urb; /* URB for reading xfer results */
+ struct urb *buf_in_urb; /* URB for reading data in */
+ struct edc dti_edc; /* DTI error density counter */
+ struct wa_xfer_result *xfer_result; /* real size = dti_ep maxpktsize */
+ size_t xfer_result_size;
+
+ s32 status; /* For reading status */
+
+ struct list_head xfer_list;
+ struct list_head xfer_delayed_list;
+ spinlock_t xfer_list_lock;
+ struct work_struct xfer_work;
+ atomic_t xfer_id_count;
+};
+
+
+extern int wa_create(struct wahc *wa, struct usb_interface *iface);
+extern void __wa_destroy(struct wahc *wa);
+void wa_reset_all(struct wahc *wa);
+
+
+/* Miscellaneous constants */
+enum {
+ /** Max number of EPROTO errors we tolerate on the NEP in a
+ * period of time */
+ HWAHC_EPROTO_MAX = 16,
+ /** Period of time for EPROTO errors (in jiffies) */
+ HWAHC_EPROTO_PERIOD = 4 * HZ,
+};
+
+
+/* Notification endpoint handling */
+extern int wa_nep_create(struct wahc *, struct usb_interface *);
+extern void wa_nep_destroy(struct wahc *);
+
+static inline int wa_nep_arm(struct wahc *wa, gfp_t gfp_mask)
+{
+ struct urb *urb = wa->nep_urb;
+ urb->transfer_buffer = wa->nep_buffer;
+ urb->transfer_buffer_length = wa->nep_buffer_size;
+ return usb_submit_urb(urb, gfp_mask);
+}
+
+static inline void wa_nep_disarm(struct wahc *wa)
+{
+ usb_kill_urb(wa->nep_urb);
+}
+
+
+/* RPipes */
+static inline void wa_rpipe_init(struct wahc *wa)
+{
+ spin_lock_init(&wa->rpipe_bm_lock);
+ mutex_init(&wa->rpipe_mutex);
+}
+
+static inline void wa_init(struct wahc *wa)
+{
+ edc_init(&wa->nep_edc);
+ atomic_set(&wa->notifs_queued, 0);
+ wa_rpipe_init(wa);
+ edc_init(&wa->dti_edc);
+ INIT_LIST_HEAD(&wa->xfer_list);
+ INIT_LIST_HEAD(&wa->xfer_delayed_list);
+ spin_lock_init(&wa->xfer_list_lock);
+ INIT_WORK(&wa->xfer_work, wa_urb_enqueue_run);
+ atomic_set(&wa->xfer_id_count, 1);
+}
+
+/**
+ * Destroy a pipe (when refcount drops to zero)
+ *
+ * Assumes it has been moved to the "QUIESCING" state.
+ */
+struct wa_xfer;
+extern void rpipe_destroy(struct kref *_rpipe);
+static inline
+void __rpipe_get(struct wa_rpipe *rpipe)
+{
+ kref_get(&rpipe->refcnt);
+}
+extern int rpipe_get_by_ep(struct wahc *, struct usb_host_endpoint *,
+ struct urb *, gfp_t);
+static inline void rpipe_put(struct wa_rpipe *rpipe)
+{
+ kref_put(&rpipe->refcnt, rpipe_destroy);
+
+}
+extern void rpipe_ep_disable(struct wahc *, struct usb_host_endpoint *);
+extern int wa_rpipes_create(struct wahc *);
+extern void wa_rpipes_destroy(struct wahc *);
+static inline void rpipe_avail_dec(struct wa_rpipe *rpipe)
+{
+ atomic_dec(&rpipe->segs_available);
+}
+
+/**
+ * Returns true if the rpipe is ready to submit more segments.
+ */
+static inline int rpipe_avail_inc(struct wa_rpipe *rpipe)
+{
+ return atomic_inc_return(&rpipe->segs_available) > 0
+ && !list_empty(&rpipe->seg_list);
+}
+
+
+/* Transferring data */
+extern int wa_urb_enqueue(struct wahc *, struct usb_host_endpoint *,
+ struct urb *, gfp_t);
+extern int wa_urb_dequeue(struct wahc *, struct urb *);
+extern void wa_handle_notif_xfer(struct wahc *, struct wa_notif_hdr *);
+
+
+/* Misc
+ *
+ * FIXME: Refcounting for the actual @hwahc object is not correct; I
+ * mean, this should be refcounting on the HCD underneath, but
+ * it is not. In any case, the semantics for HCD refcounting
+ * are *weird*...on refcount reaching zero it just frees
+ * it...no RC specific function is called...unless I miss
+ * something.
+ *
+ * FIXME: has to go away in favour of an 'struct' hcd based sollution
+ */
+static inline struct wahc *wa_get(struct wahc *wa)
+{
+ usb_get_intf(wa->usb_iface);
+ return wa;
+}
+
+static inline void wa_put(struct wahc *wa)
+{
+ usb_put_intf(wa->usb_iface);
+}
+
+
+static inline int __wa_feature(struct wahc *wa, unsigned op, u16 feature)
+{
+ return usb_control_msg(wa->usb_dev, usb_sndctrlpipe(wa->usb_dev, 0),
+ op ? USB_REQ_SET_FEATURE : USB_REQ_CLEAR_FEATURE,
+ USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
+ feature,
+ wa->usb_iface->cur_altsetting->desc.bInterfaceNumber,
+ NULL, 0, 1000 /* FIXME: arbitrary */);
+}
+
+
+static inline int __wa_set_feature(struct wahc *wa, u16 feature)
+{
+ return __wa_feature(wa, 1, feature);
+}
+
+
+static inline int __wa_clear_feature(struct wahc *wa, u16 feature)
+{
+ return __wa_feature(wa, 0, feature);
+}
+
+
+/**
+ * Return the status of a Wire Adapter
+ *
+ * @wa: Wire Adapter instance
+ * @returns < 0 errno code on error, or status bitmap as described
+ * in WUSB1.0[8.3.1.6].
+ *
+ * NOTE: need malloc, some arches don't take USB from the stack
+ */
+static inline
+s32 __wa_get_status(struct wahc *wa)
+{
+ s32 result;
+ result = usb_control_msg(
+ wa->usb_dev, usb_rcvctrlpipe(wa->usb_dev, 0),
+ USB_REQ_GET_STATUS,
+ USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
+ 0, wa->usb_iface->cur_altsetting->desc.bInterfaceNumber,
+ &wa->status, sizeof(wa->status),
+ 1000 /* FIXME: arbitrary */);
+ if (result >= 0)
+ result = wa->status;
+ return result;
+}
+
+
+/**
+ * Waits until the Wire Adapter's status matches @mask/@value
+ *
+ * @wa: Wire Adapter instance.
+ * @returns < 0 errno code on error, otherwise status.
+ *
+ * Loop until the WAs status matches the mask and value (status & mask
+ * == value). Timeout if it doesn't happen.
+ *
+ * FIXME: is there an official specification on how long status
+ * changes can take?
+ */
+static inline s32 __wa_wait_status(struct wahc *wa, u32 mask, u32 value)
+{
+ s32 result;
+ unsigned loops = 10;
+ do {
+ msleep(50);
+ result = __wa_get_status(wa);
+ if ((result & mask) == value)
+ break;
+ if (loops-- == 0) {
+ result = -ETIMEDOUT;
+ break;
+ }
+ } while (result >= 0);
+ return result;
+}
+
+
+/** Command @hwahc to stop, @returns 0 if ok, < 0 errno code on error */
+static inline int __wa_stop(struct wahc *wa)
+{
+ int result;
+ struct device *dev = &wa->usb_iface->dev;
+
+ result = __wa_clear_feature(wa, WA_ENABLE);
+ if (result < 0 && result != -ENODEV) {
+ dev_err(dev, "error commanding HC to stop: %d\n", result);
+ goto out;
+ }
+ result = __wa_wait_status(wa, WA_ENABLE, 0);
+ if (result < 0 && result != -ENODEV)
+ dev_err(dev, "error waiting for HC to stop: %d\n", result);
+out:
+ return 0;
+}
+
+
+#endif /* #ifndef __HWAHC_INTERNAL_H__ */
diff --git a/drivers/usb/wusbcore/wa-nep.c b/drivers/usb/wusbcore/wa-nep.c
new file mode 100644
index 0000000..3f54299
--- /dev/null
+++ b/drivers/usb/wusbcore/wa-nep.c
@@ -0,0 +1,310 @@
+/*
+ * WUSB Wire Adapter: Control/Data Streaming Interface (WUSB[8])
+ * Notification EndPoint support
+ *
+ * Copyright (C) 2006 Intel Corporation
+ * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version
+ * 2 as published by the Free Software Foundation.
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ *
+ *
+ * This part takes care of getting the notification from the hw
+ * only and dispatching through wusbwad into
+ * wa_notif_dispatch. Handling is done there.
+ *
+ * WA notifications are limited in size; most of them are three or
+ * four bytes long, and the longest is the HWA Device Notification,
+ * which would not exceed 38 bytes (DNs are limited in payload to 32
+ * bytes plus 3 bytes header (WUSB1.0[7.6p2]), plus 3 bytes HWA
+ * header (WUSB1.0[8.5.4.2]).
+ *
+ * It is not clear if more than one Device Notification can be packed
+ * in a HWA Notification, I assume no because of the wording in
+ * WUSB1.0[8.5.4.2]. In any case, the bigger any notification could
+ * get is 256 bytes (as the bLength field is a byte).
+ *
+ * So what we do is we have this buffer and read into it; when a
+ * notification arrives we schedule work to a specific, single thread
+ * workqueue (so notifications are serialized) and copy the
+ * notification data. After scheduling the work, we rearm the read from
+ * the notification endpoint.
+ *
+ * Entry points here are:
+ *
+ * wa_nep_[create|destroy]() To initialize/release this subsystem
+ *
+ * wa_nep_cb() Callback for the notification
+ * endpoint; when data is ready, this
+ * does the dispatching.
+ */
+#include <linux/workqueue.h>
+#include <linux/ctype.h>
+#include <linux/uwb/debug.h>
+#include "wa-hc.h"
+#include "wusbhc.h"
+
+/* Structure for queueing notifications to the workqueue */
+struct wa_notif_work {
+ struct work_struct work;
+ struct wahc *wa;
+ size_t size;
+ u8 data[];
+};
+
+/*
+ * Process incoming notifications from the WA's Notification EndPoint
+ * [the wuswad daemon, basically]
+ *
+ * @_nw: Pointer to a descriptor which has the pointer to the
+ * @wa, the size of the buffer and the work queue
+ * structure (so we can free all when done).
+ * @returns 0 if ok, < 0 errno code on error.
+ *
+ * All notifications follow the same format; they need to start with a
+ * 'struct wa_notif_hdr' header, so it is easy to parse through
+ * them. We just break the buffer in individual notifications (the
+ * standard doesn't say if it can be done or is forbidden, so we are
+ * cautious) and dispatch each.
+ *
+ * So the handling layers are is:
+ *
+ * WA specific notification (from NEP)
+ * Device Notification Received -> wa_handle_notif_dn()
+ * WUSB Device notification generic handling
+ * BPST Adjustment -> wa_handle_notif_bpst_adj()
+ * ... -> ...
+ *
+ * @wa has to be referenced
+ */
+static void wa_notif_dispatch(struct work_struct *ws)
+{
+ void *itr;
+ u8 missing = 0;
+ struct wa_notif_work *nw = container_of(ws, struct wa_notif_work, work);
+ struct wahc *wa = nw->wa;
+ struct wa_notif_hdr *notif_hdr;
+ size_t size;
+
+ struct device *dev = &wa->usb_iface->dev;
+
+#if 0
+ /* FIXME: need to check for this??? */
+ if (usb_hcd->state == HC_STATE_QUIESCING) /* Going down? */
+ goto out; /* screw it */
+#endif
+ atomic_dec(&wa->notifs_queued); /* Throttling ctl */
+ dev = &wa->usb_iface->dev;
+ size = nw->size;
+ itr = nw->data;
+
+ while (size) {
+ if (size < sizeof(*notif_hdr)) {
+ missing = sizeof(*notif_hdr) - size;
+ goto exhausted_buffer;
+ }
+ notif_hdr = itr;
+ if (size < notif_hdr->bLength)
+ goto exhausted_buffer;
+ itr += notif_hdr->bLength;
+ size -= notif_hdr->bLength;
+ /* Dispatch the notification [don't use itr or size!] */
+ switch (notif_hdr->bNotifyType) {
+ case HWA_NOTIF_DN: {
+ struct hwa_notif_dn *hwa_dn;
+ hwa_dn = container_of(notif_hdr, struct hwa_notif_dn,
+ hdr);
+ wusbhc_handle_dn(wa->wusb, hwa_dn->bSourceDeviceAddr,
+ hwa_dn->dndata,
+ notif_hdr->bLength - sizeof(*hwa_dn));
+ break;
+ }
+ case WA_NOTIF_TRANSFER:
+ wa_handle_notif_xfer(wa, notif_hdr);
+ break;
+ case DWA_NOTIF_RWAKE:
+ case DWA_NOTIF_PORTSTATUS:
+ case HWA_NOTIF_BPST_ADJ:
+ /* FIXME: unimplemented WA NOTIFs */
+ /* fallthru */
+ default:
+ if (printk_ratelimit()) {
+ dev_err(dev, "HWA: unknown notification 0x%x, "
+ "%zu bytes; discarding\n",
+ notif_hdr->bNotifyType,
+ (size_t)notif_hdr->bLength);
+ dump_bytes(dev, notif_hdr, 16);
+ }
+ break;
+ }
+ }
+out:
+ wa_put(wa);
+ kfree(nw);
+ return;
+
+ /* THIS SHOULD NOT HAPPEN
+ *
+ * Buffer exahusted with partial data remaining; just warn and
+ * discard the data, as this should not happen.
+ */
+exhausted_buffer:
+ if (!printk_ratelimit())
+ goto out;
+ dev_warn(dev, "HWA: device sent short notification, "
+ "%d bytes missing; discarding %d bytes.\n",
+ missing, (int)size);
+ dump_bytes(dev, itr, size);
+ goto out;
+}
+
+/*
+ * Deliver incoming WA notifications to the wusbwa workqueue
+ *
+ * @wa: Pointer the Wire Adapter Controller Data Streaming
+ * instance (part of an 'struct usb_hcd').
+ * @size: Size of the received buffer
+ * @returns 0 if ok, < 0 errno code on error.
+ *
+ * The input buffer is @wa->nep_buffer, with @size bytes
+ * (guaranteed to fit in the allocated space,
+ * @wa->nep_buffer_size).
+ */
+static int wa_nep_queue(struct wahc *wa, size_t size)
+{
+ int result = 0;
+ struct device *dev = &wa->usb_iface->dev;
+ struct wa_notif_work *nw;
+
+ /* dev_fnstart(dev, "(wa %p, size %zu)\n", wa, size); */
+ BUG_ON(size > wa->nep_buffer_size);
+ if (size == 0)
+ goto out;
+ if (atomic_read(&wa->notifs_queued) > 200) {
+ if (printk_ratelimit())
+ dev_err(dev, "Too many notifications queued, "
+ "throttling back\n");
+ goto out;
+ }
+ nw = kzalloc(sizeof(*nw) + size, GFP_ATOMIC);
+ if (nw == NULL) {
+ if (printk_ratelimit())
+ dev_err(dev, "No memory to queue notification\n");
+ goto out;
+ }
+ INIT_WORK(&nw->work, wa_notif_dispatch);
+ nw->wa = wa_get(wa);
+ nw->size = size;
+ memcpy(nw->data, wa->nep_buffer, size);
+ atomic_inc(&wa->notifs_queued); /* Throttling ctl */
+ queue_work(wusbd, &nw->work);
+out:
+ /* dev_fnend(dev, "(wa %p, size %zu) = result\n", wa, size, result); */
+ return result;
+}
+
+/*
+ * Callback for the notification event endpoint
+ *
+ * Check's that everything is fine and then passes the data to be
+ * queued to the workqueue.
+ */
+static void wa_nep_cb(struct urb *urb)
+{
+ int result;
+ struct wahc *wa = urb->context;
+ struct device *dev = &wa->usb_iface->dev;
+
+ switch (result = urb->status) {
+ case 0:
+ result = wa_nep_queue(wa, urb->actual_length);
+ if (result < 0)
+ dev_err(dev, "NEP: unable to process notification(s): "
+ "%d\n", result);
+ break;
+ case -ECONNRESET: /* Not an error, but a controlled situation; */
+ case -ENOENT: /* (we killed the URB)...so, no broadcast */
+ case -ESHUTDOWN:
+ dev_dbg(dev, "NEP: going down %d\n", urb->status);
+ goto out;
+ default: /* On general errors, we retry unless it gets ugly */
+ if (edc_inc(&wa->nep_edc, EDC_MAX_ERRORS,
+ EDC_ERROR_TIMEFRAME)) {
+ dev_err(dev, "NEP: URB max acceptable errors "
+ "exceeded, resetting device\n");
+ wa_reset_all(wa);
+ goto out;
+ }
+ dev_err(dev, "NEP: URB error %d\n", urb->status);
+ }
+ result = wa_nep_arm(wa, GFP_ATOMIC);
+ if (result < 0) {
+ dev_err(dev, "NEP: cannot submit URB: %d\n", result);
+ wa_reset_all(wa);
+ }
+out:
+ return;
+}
+
+/*
+ * Initialize @wa's notification and event's endpoint stuff
+ *
+ * This includes the allocating the read buffer, the context ID
+ * allocation bitmap, the URB and submitting the URB.
+ */
+int wa_nep_create(struct wahc *wa, struct usb_interface *iface)
+{
+ int result;
+ struct usb_endpoint_descriptor *epd;
+ struct usb_device *usb_dev = interface_to_usbdev(iface);
+ struct device *dev = &iface->dev;
+
+ edc_init(&wa->nep_edc);
+ epd = &iface->cur_altsetting->endpoint[0].desc;
+ wa->nep_buffer_size = 1024;
+ wa->nep_buffer = kmalloc(wa->nep_buffer_size, GFP_KERNEL);
+ if (wa->nep_buffer == NULL) {
+ dev_err(dev, "Unable to allocate notification's read buffer\n");
+ goto error_nep_buffer;
+ }
+ wa->nep_urb = usb_alloc_urb(0, GFP_KERNEL);
+ if (wa->nep_urb == NULL) {
+ dev_err(dev, "Unable to allocate notification URB\n");
+ goto error_urb_alloc;
+ }
+ usb_fill_int_urb(wa->nep_urb, usb_dev,
+ usb_rcvintpipe(usb_dev, epd->bEndpointAddress),
+ wa->nep_buffer, wa->nep_buffer_size,
+ wa_nep_cb, wa, epd->bInterval);
+ result = wa_nep_arm(wa, GFP_KERNEL);
+ if (result < 0) {
+ dev_err(dev, "Cannot submit notification URB: %d\n", result);
+ goto error_nep_arm;
+ }
+ return 0;
+
+error_nep_arm:
+ usb_free_urb(wa->nep_urb);
+error_urb_alloc:
+ kfree(wa->nep_buffer);
+error_nep_buffer:
+ return -ENOMEM;
+}
+
+void wa_nep_destroy(struct wahc *wa)
+{
+ wa_nep_disarm(wa);
+ usb_free_urb(wa->nep_urb);
+ kfree(wa->nep_buffer);
+}
diff --git a/drivers/usb/wusbcore/wa-rpipe.c b/drivers/usb/wusbcore/wa-rpipe.c
new file mode 100644
index 0000000..bfe3752
--- /dev/null
+++ b/drivers/usb/wusbcore/wa-rpipe.c
@@ -0,0 +1,562 @@
+/*
+ * WUSB Wire Adapter
+ * rpipe management
+ *
+ * Copyright (C) 2005-2006 Intel Corporation
+ * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version
+ * 2 as published by the Free Software Foundation.
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ *
+ *
+ * FIXME: docs
+ *
+ * RPIPE
+ *
+ * Targetted at different downstream endpoints
+ *
+ * Descriptor: use to config the remote pipe.
+ *
+ * The number of blocks could be dynamic (wBlocks in descriptor is
+ * 0)--need to schedule them then.
+ *
+ * Each bit in wa->rpipe_bm represents if an rpipe is being used or
+ * not. Rpipes are represented with a 'struct wa_rpipe' that is
+ * attached to the hcpriv member of a 'struct usb_host_endpoint'.
+ *
+ * When you need to xfer data to an endpoint, you get an rpipe for it
+ * with wa_ep_rpipe_get(), which gives you a reference to the rpipe
+ * and keeps a single one (the first one) with the endpoint. When you
+ * are done transferring, you drop that reference. At the end the
+ * rpipe is always allocated and bound to the endpoint. There it might
+ * be recycled when not used.
+ *
+ * Addresses:
+ *
+ * We use a 1:1 mapping mechanism between port address (0 based
+ * index, actually) and the address. The USB stack knows about this.
+ *
+ * USB Stack port number 4 (1 based)
+ * WUSB code port index 3 (0 based)
+ * USB Addresss 5 (2 based -- 0 is for default, 1 for root hub)
+ *
+ * Now, because we don't use the concept as default address exactly
+ * like the (wired) USB code does, we need to kind of skip it. So we
+ * never take addresses from the urb->pipe, but from the
+ * urb->dev->devnum, to make sure that we always have the right
+ * destination address.
+ */
+#include <linux/init.h>
+#include <asm/atomic.h>
+#include <linux/bitmap.h>
+#include "wusbhc.h"
+#include "wa-hc.h"
+
+#define D_LOCAL 0
+#include <linux/uwb/debug.h>
+
+
+static int __rpipe_get_descr(struct wahc *wa,
+ struct usb_rpipe_descriptor *descr, u16 index)
+{
+ ssize_t result;
+ struct device *dev = &wa->usb_iface->dev;
+
+ /* Get the RPIPE descriptor -- we cannot use the usb_get_descriptor()
+ * function because the arguments are different.
+ */
+ d_printf(1, dev, "rpipe %u: get descr\n", index);
+ result = usb_control_msg(
+ wa->usb_dev, usb_rcvctrlpipe(wa->usb_dev, 0),
+ USB_REQ_GET_DESCRIPTOR,
+ USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_RPIPE,
+ USB_DT_RPIPE<<8, index, descr, sizeof(*descr),
+ 1000 /* FIXME: arbitrary */);
+ if (result < 0) {
+ dev_err(dev, "rpipe %u: get descriptor failed: %d\n",
+ index, (int)result);
+ goto error;
+ }
+ if (result < sizeof(*descr)) {
+ dev_err(dev, "rpipe %u: got short descriptor "
+ "(%zd vs %zd bytes needed)\n",
+ index, result, sizeof(*descr));
+ result = -EINVAL;
+ goto error;
+ }
+ result = 0;
+
+error:
+ return result;
+}
+
+/*
+ *
+ * The descriptor is assumed to be properly initialized (ie: you got
+ * it through __rpipe_get_descr()).
+ */
+static int __rpipe_set_descr(struct wahc *wa,
+ struct usb_rpipe_descriptor *descr, u16 index)
+{
+ ssize_t result;
+ struct device *dev = &wa->usb_iface->dev;
+
+ /* we cannot use the usb_get_descriptor() function because the
+ * arguments are different.
+ */
+ d_printf(1, dev, "rpipe %u: set descr\n", index);
+ result = usb_control_msg(
+ wa->usb_dev, usb_sndctrlpipe(wa->usb_dev, 0),
+ USB_REQ_SET_DESCRIPTOR,
+ USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_RPIPE,
+ USB_DT_RPIPE<<8, index, descr, sizeof(*descr),
+ HZ / 10);
+ if (result < 0) {
+ dev_err(dev, "rpipe %u: set descriptor failed: %d\n",
+ index, (int)result);
+ goto error;
+ }
+ if (result < sizeof(*descr)) {
+ dev_err(dev, "rpipe %u: sent short descriptor "
+ "(%zd vs %zd bytes required)\n",
+ index, result, sizeof(*descr));
+ result = -EINVAL;
+ goto error;
+ }
+ result = 0;
+
+error:
+ return result;
+
+}
+
+static void rpipe_init(struct wa_rpipe *rpipe)
+{
+ kref_init(&rpipe->refcnt);
+ spin_lock_init(&rpipe->seg_lock);
+ INIT_LIST_HEAD(&rpipe->seg_list);
+}
+
+static unsigned rpipe_get_idx(struct wahc *wa, unsigned rpipe_idx)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&wa->rpipe_bm_lock, flags);
+ rpipe_idx = find_next_zero_bit(wa->rpipe_bm, wa->rpipes, rpipe_idx);
+ if (rpipe_idx < wa->rpipes)
+ set_bit(rpipe_idx, wa->rpipe_bm);
+ spin_unlock_irqrestore(&wa->rpipe_bm_lock, flags);
+
+ return rpipe_idx;
+}
+
+static void rpipe_put_idx(struct wahc *wa, unsigned rpipe_idx)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&wa->rpipe_bm_lock, flags);
+ clear_bit(rpipe_idx, wa->rpipe_bm);
+ spin_unlock_irqrestore(&wa->rpipe_bm_lock, flags);
+}
+
+void rpipe_destroy(struct kref *_rpipe)
+{
+ struct wa_rpipe *rpipe = container_of(_rpipe, struct wa_rpipe, refcnt);
+ u8 index = le16_to_cpu(rpipe->descr.wRPipeIndex);
+ d_fnstart(1, NULL, "(rpipe %p %u)\n", rpipe, index);
+ if (rpipe->ep)
+ rpipe->ep->hcpriv = NULL;
+ rpipe_put_idx(rpipe->wa, index);
+ wa_put(rpipe->wa);
+ kfree(rpipe);
+ d_fnend(1, NULL, "(rpipe %p %u)\n", rpipe, index);
+}
+EXPORT_SYMBOL_GPL(rpipe_destroy);
+
+/*
+ * Locate an idle rpipe, create an structure for it and return it
+ *
+ * @wa is referenced and unlocked
+ * @crs enum rpipe_attr, required endpoint characteristics
+ *
+ * The rpipe can be used only sequentially (not in parallel).
+ *
+ * The rpipe is moved into the "ready" state.
+ */
+static int rpipe_get_idle(struct wa_rpipe **prpipe, struct wahc *wa, u8 crs,
+ gfp_t gfp)
+{
+ int result;
+ unsigned rpipe_idx;
+ struct wa_rpipe *rpipe;
+ struct device *dev = &wa->usb_iface->dev;
+
+ d_fnstart(3, dev, "(wa %p crs 0x%02x)\n", wa, crs);
+ rpipe = kzalloc(sizeof(*rpipe), gfp);
+ if (rpipe == NULL)
+ return -ENOMEM;
+ rpipe_init(rpipe);
+
+ /* Look for an idle pipe */
+ for (rpipe_idx = 0; rpipe_idx < wa->rpipes; rpipe_idx++) {
+ rpipe_idx = rpipe_get_idx(wa, rpipe_idx);
+ if (rpipe_idx >= wa->rpipes) /* no more pipes :( */
+ break;
+ result = __rpipe_get_descr(wa, &rpipe->descr, rpipe_idx);
+ if (result < 0)
+ dev_err(dev, "Can't get descriptor for rpipe %u: %d\n",
+ rpipe_idx, result);
+ else if ((rpipe->descr.bmCharacteristics & crs) != 0)
+ goto found;
+ rpipe_put_idx(wa, rpipe_idx);
+ }
+ *prpipe = NULL;
+ kfree(rpipe);
+ d_fnend(3, dev, "(wa %p crs 0x%02x) = -ENXIO\n", wa, crs);
+ return -ENXIO;
+
+found:
+ set_bit(rpipe_idx, wa->rpipe_bm);
+ rpipe->wa = wa_get(wa);
+ *prpipe = rpipe;
+ d_fnstart(3, dev, "(wa %p crs 0x%02x) = 0\n", wa, crs);
+ return 0;
+}
+
+static int __rpipe_reset(struct wahc *wa, unsigned index)
+{
+ int result;
+ struct device *dev = &wa->usb_iface->dev;
+
+ d_printf(1, dev, "rpipe %u: reset\n", index);
+ result = usb_control_msg(
+ wa->usb_dev, usb_sndctrlpipe(wa->usb_dev, 0),
+ USB_REQ_RPIPE_RESET,
+ USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_RPIPE,
+ 0, index, NULL, 0, 1000 /* FIXME: arbitrary */);
+ if (result < 0)
+ dev_err(dev, "rpipe %u: reset failed: %d\n",
+ index, result);
+ return result;
+}
+
+/*
+ * Fake companion descriptor for ep0
+ *
+ * See WUSB1.0[7.4.4], most of this is zero for bulk/int/ctl
+ */
+static struct usb_wireless_ep_comp_descriptor epc0 = {
+ .bLength = sizeof(epc0),
+ .bDescriptorType = USB_DT_WIRELESS_ENDPOINT_COMP,
+/* .bMaxBurst = 1, */
+ .bMaxSequence = 31,
+};
+
+/*
+ * Look for EP companion descriptor
+ *
+ * Get there, look for Inara in the endpoint's extra descriptors
+ */
+static struct usb_wireless_ep_comp_descriptor *rpipe_epc_find(
+ struct device *dev, struct usb_host_endpoint *ep)
+{
+ void *itr;
+ size_t itr_size;
+ struct usb_descriptor_header *hdr;
+ struct usb_wireless_ep_comp_descriptor *epcd;
+
+ d_fnstart(3, dev, "(ep %p)\n", ep);
+ if (ep->desc.bEndpointAddress == 0) {
+ epcd = &epc0;
+ goto out;
+ }
+ itr = ep->extra;
+ itr_size = ep->extralen;
+ epcd = NULL;
+ while (itr_size > 0) {
+ if (itr_size < sizeof(*hdr)) {
+ dev_err(dev, "HW Bug? ep 0x%02x: extra descriptors "
+ "at offset %zu: only %zu bytes left\n",
+ ep->desc.bEndpointAddress,
+ itr - (void *) ep->extra, itr_size);
+ break;
+ }
+ hdr = itr;
+ if (hdr->bDescriptorType == USB_DT_WIRELESS_ENDPOINT_COMP) {
+ epcd = itr;
+ break;
+ }
+ if (hdr->bLength > itr_size) {
+ dev_err(dev, "HW Bug? ep 0x%02x: extra descriptor "
+ "at offset %zu (type 0x%02x) "
+ "length %d but only %zu bytes left\n",
+ ep->desc.bEndpointAddress,
+ itr - (void *) ep->extra, hdr->bDescriptorType,
+ hdr->bLength, itr_size);
+ break;
+ }
+ itr += hdr->bLength;
+ itr_size -= hdr->bDescriptorType;
+ }
+out:
+ d_fnend(3, dev, "(ep %p) = %p\n", ep, epcd);
+ return epcd;
+}
+
+/*
+ * Aim an rpipe to its device & endpoint destination
+ *
+ * Make sure we change the address to unauthenticathed if the device
+ * is WUSB and it is not authenticated.
+ */
+static int rpipe_aim(struct wa_rpipe *rpipe, struct wahc *wa,
+ struct usb_host_endpoint *ep, struct urb *urb, gfp_t gfp)
+{
+ int result = -ENOMSG; /* better code for lack of companion? */
+ struct device *dev = &wa->usb_iface->dev;
+ struct usb_device *usb_dev = urb->dev;
+ struct usb_wireless_ep_comp_descriptor *epcd;
+ u8 unauth;
+
+ d_fnstart(3, dev, "(rpipe %p wa %p ep %p, urb %p)\n",
+ rpipe, wa, ep, urb);
+ epcd = rpipe_epc_find(dev, ep);
+ if (epcd == NULL) {
+ dev_err(dev, "ep 0x%02x: can't find companion descriptor\n",
+ ep->desc.bEndpointAddress);
+ goto error;
+ }
+ unauth = usb_dev->wusb && !usb_dev->authenticated ? 0x80 : 0;
+ __rpipe_reset(wa, le16_to_cpu(rpipe->descr.wRPipeIndex));
+ atomic_set(&rpipe->segs_available, le16_to_cpu(rpipe->descr.wRequests));
+ /* FIXME: block allocation system; request with queuing and timeout */
+ /* FIXME: compute so seg_size > ep->maxpktsize */
+ rpipe->descr.wBlocks = cpu_to_le16(16); /* given */
+ /* ep0 maxpktsize is 0x200 (WUSB1.0[4.8.1]) */
+ rpipe->descr.wMaxPacketSize = cpu_to_le16(ep->desc.wMaxPacketSize);
+ rpipe->descr.bHSHubAddress = 0; /* reserved: zero */
+ rpipe->descr.bHSHubPort = wusb_port_no_to_idx(urb->dev->portnum);
+ /* FIXME: use maximum speed as supported or recommended by device */
+ rpipe->descr.bSpeed = usb_pipeendpoint(urb->pipe) == 0 ?
+ UWB_PHY_RATE_53 : UWB_PHY_RATE_200;
+ d_printf(2, dev, "addr %u (0x%02x) rpipe #%u ep# %u speed %d\n",
+ urb->dev->devnum, urb->dev->devnum | unauth,
+ le16_to_cpu(rpipe->descr.wRPipeIndex),
+ usb_pipeendpoint(urb->pipe), rpipe->descr.bSpeed);
+ /* see security.c:wusb_update_address() */
+ if (unlikely(urb->dev->devnum == 0x80))
+ rpipe->descr.bDeviceAddress = 0;
+ else
+ rpipe->descr.bDeviceAddress = urb->dev->devnum | unauth;
+ rpipe->descr.bEndpointAddress = ep->desc.bEndpointAddress;
+ /* FIXME: bDataSequence */
+ rpipe->descr.bDataSequence = 0;
+ /* FIXME: dwCurrentWindow */
+ rpipe->descr.dwCurrentWindow = cpu_to_le32(1);
+ /* FIXME: bMaxDataSequence */
+ rpipe->descr.bMaxDataSequence = epcd->bMaxSequence - 1;
+ rpipe->descr.bInterval = ep->desc.bInterval;
+ /* FIXME: bOverTheAirInterval */
+ rpipe->descr.bOverTheAirInterval = 0; /* 0 if not isoc */
+ /* FIXME: xmit power & preamble blah blah */
+ rpipe->descr.bmAttribute = ep->desc.bmAttributes & 0x03;
+ /* rpipe->descr.bmCharacteristics RO */
+ /* FIXME: bmRetryOptions */
+ rpipe->descr.bmRetryOptions = 15;
+ /* FIXME: use for assessing link quality? */
+ rpipe->descr.wNumTransactionErrors = 0;
+ result = __rpipe_set_descr(wa, &rpipe->descr,
+ le16_to_cpu(rpipe->descr.wRPipeIndex));
+ if (result < 0) {
+ dev_err(dev, "Cannot aim rpipe: %d\n", result);
+ goto error;
+ }
+ result = 0;
+error:
+ d_fnend(3, dev, "(rpipe %p wa %p ep %p urb %p) = %d\n",
+ rpipe, wa, ep, urb, result);
+ return result;
+}
+
+/*
+ * Check an aimed rpipe to make sure it points to where we want
+ *
+ * We use bit 19 of the Linux USB pipe bitmap for unauth vs auth
+ * space; when it is like that, we or 0x80 to make an unauth address.
+ */
+static int rpipe_check_aim(const struct wa_rpipe *rpipe, const struct wahc *wa,
+ const struct usb_host_endpoint *ep,
+ const struct urb *urb, gfp_t gfp)
+{
+ int result = 0; /* better code for lack of companion? */
+ struct device *dev = &wa->usb_iface->dev;
+ struct usb_device *usb_dev = urb->dev;
+ u8 unauth = (usb_dev->wusb && !usb_dev->authenticated) ? 0x80 : 0;
+ u8 portnum = wusb_port_no_to_idx(urb->dev->portnum);
+
+ d_fnstart(3, dev, "(rpipe %p wa %p ep %p, urb %p)\n",
+ rpipe, wa, ep, urb);
+#define AIM_CHECK(rdf, val, text) \
+ do { \
+ if (rpipe->descr.rdf != (val)) { \
+ dev_err(dev, \
+ "rpipe aim discrepancy: " #rdf " " text "\n", \
+ rpipe->descr.rdf, (val)); \
+ result = -EINVAL; \
+ WARN_ON(1); \
+ } \
+ } while (0)
+ AIM_CHECK(wMaxPacketSize, cpu_to_le16(ep->desc.wMaxPacketSize),
+ "(%u vs %u)");
+ AIM_CHECK(bHSHubPort, portnum, "(%u vs %u)");
+ AIM_CHECK(bSpeed, usb_pipeendpoint(urb->pipe) == 0 ?
+ UWB_PHY_RATE_53 : UWB_PHY_RATE_200,
+ "(%u vs %u)");
+ AIM_CHECK(bDeviceAddress, urb->dev->devnum | unauth, "(%u vs %u)");
+ AIM_CHECK(bEndpointAddress, ep->desc.bEndpointAddress, "(%u vs %u)");
+ AIM_CHECK(bInterval, ep->desc.bInterval, "(%u vs %u)");
+ AIM_CHECK(bmAttribute, ep->desc.bmAttributes & 0x03, "(%u vs %u)");
+#undef AIM_CHECK
+ return result;
+}
+
+#ifndef CONFIG_BUG
+#define CONFIG_BUG 0
+#endif
+
+/*
+ * Make sure there is an rpipe allocated for an endpoint
+ *
+ * If already allocated, we just refcount it; if not, we get an
+ * idle one, aim it to the right location and take it.
+ *
+ * Attaches to ep->hcpriv and rpipe->ep to ep.
+ */
+int rpipe_get_by_ep(struct wahc *wa, struct usb_host_endpoint *ep,
+ struct urb *urb, gfp_t gfp)
+{
+ int result = 0;
+ struct device *dev = &wa->usb_iface->dev;
+ struct wa_rpipe *rpipe;
+ u8 eptype;
+
+ d_fnstart(3, dev, "(wa %p ep %p urb %p gfp 0x%08x)\n", wa, ep, urb,
+ gfp);
+ mutex_lock(&wa->rpipe_mutex);
+ rpipe = ep->hcpriv;
+ if (rpipe != NULL) {
+ if (CONFIG_BUG == 1) {
+ result = rpipe_check_aim(rpipe, wa, ep, urb, gfp);
+ if (result < 0)
+ goto error;
+ }
+ __rpipe_get(rpipe);
+ d_printf(2, dev, "ep 0x%02x: reusing rpipe %u\n",
+ ep->desc.bEndpointAddress,
+ le16_to_cpu(rpipe->descr.wRPipeIndex));
+ } else {
+ /* hmm, assign idle rpipe, aim it */
+ result = -ENOBUFS;
+ eptype = ep->desc.bmAttributes & 0x03;
+ result = rpipe_get_idle(&rpipe, wa, 1 << eptype, gfp);
+ if (result < 0)
+ goto error;
+ result = rpipe_aim(rpipe, wa, ep, urb, gfp);
+ if (result < 0) {
+ rpipe_put(rpipe);
+ goto error;
+ }
+ ep->hcpriv = rpipe;
+ rpipe->ep = ep;
+ __rpipe_get(rpipe); /* for caching into ep->hcpriv */
+ d_printf(2, dev, "ep 0x%02x: using rpipe %u\n",
+ ep->desc.bEndpointAddress,
+ le16_to_cpu(rpipe->descr.wRPipeIndex));
+ }
+ d_dump(4, dev, &rpipe->descr, sizeof(rpipe->descr));
+error:
+ mutex_unlock(&wa->rpipe_mutex);
+ d_fnend(3, dev, "(wa %p ep %p urb %p gfp 0x%08x)\n", wa, ep, urb, gfp);
+ return result;
+}
+
+/*
+ * Allocate the bitmap for each rpipe.
+ */
+int wa_rpipes_create(struct wahc *wa)
+{
+ wa->rpipes = wa->wa_descr->wNumRPipes;
+ wa->rpipe_bm = kzalloc(BITS_TO_LONGS(wa->rpipes)*sizeof(unsigned long),
+ GFP_KERNEL);
+ if (wa->rpipe_bm == NULL)
+ return -ENOMEM;
+ return 0;
+}
+
+void wa_rpipes_destroy(struct wahc *wa)
+{
+ struct device *dev = &wa->usb_iface->dev;
+ d_fnstart(3, dev, "(wa %p)\n", wa);
+ if (!bitmap_empty(wa->rpipe_bm, wa->rpipes)) {
+ char buf[256];
+ WARN_ON(1);
+ bitmap_scnprintf(buf, sizeof(buf), wa->rpipe_bm, wa->rpipes);
+ dev_err(dev, "BUG: pipes not released on exit: %s\n", buf);
+ }
+ kfree(wa->rpipe_bm);
+ d_fnend(3, dev, "(wa %p)\n", wa);
+}
+
+/*
+ * Release resources allocated for an endpoint
+ *
+ * If there is an associated rpipe to this endpoint, Abort any pending
+ * transfers and put it. If the rpipe ends up being destroyed,
+ * __rpipe_destroy() will cleanup ep->hcpriv.
+ *
+ * This is called before calling hcd->stop(), so you don't need to do
+ * anything else in there.
+ */
+void rpipe_ep_disable(struct wahc *wa, struct usb_host_endpoint *ep)
+{
+ struct device *dev = &wa->usb_iface->dev;
+ struct wa_rpipe *rpipe;
+ d_fnstart(2, dev, "(wa %p ep %p)\n", wa, ep);
+ mutex_lock(&wa->rpipe_mutex);
+ rpipe = ep->hcpriv;
+ if (rpipe != NULL) {
+ unsigned rc = atomic_read(&rpipe->refcnt.refcount);
+ int result;
+ u16 index = le16_to_cpu(rpipe->descr.wRPipeIndex);
+
+ if (rc != 1)
+ d_printf(1, dev, "(wa %p ep %p) rpipe %p refcnt %u\n",
+ wa, ep, rpipe, rc);
+
+ d_printf(1, dev, "rpipe %u: abort\n", index);
+ result = usb_control_msg(
+ wa->usb_dev, usb_rcvctrlpipe(wa->usb_dev, 0),
+ USB_REQ_RPIPE_ABORT,
+ USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_RPIPE,
+ 0, index, NULL, 0, 1000 /* FIXME: arbitrary */);
+ if (result < 0 && result != -ENODEV /* dev is gone */)
+ d_printf(1, dev, "(wa %p rpipe %u): abort failed: %d\n",
+ wa, index, result);
+ rpipe_put(rpipe);
+ }
+ mutex_unlock(&wa->rpipe_mutex);
+ d_fnend(2, dev, "(wa %p ep %p)\n", wa, ep);
+ return;
+}
+EXPORT_SYMBOL_GPL(rpipe_ep_disable);
diff --git a/drivers/usb/wusbcore/wa-xfer.c b/drivers/usb/wusbcore/wa-xfer.c
new file mode 100644
index 0000000..7d192f3
--- /dev/null
+++ b/drivers/usb/wusbcore/wa-xfer.c
@@ -0,0 +1,1709 @@
+/*
+ * WUSB Wire Adapter
+ * Data transfer and URB enqueing
+ *
+ * Copyright (C) 2005-2006 Intel Corporation
+ * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version
+ * 2 as published by the Free Software Foundation.
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ *
+ *
+ * How transfers work: get a buffer, break it up in segments (segment
+ * size is a multiple of the maxpacket size). For each segment issue a
+ * segment request (struct wa_xfer_*), then send the data buffer if
+ * out or nothing if in (all over the DTO endpoint).
+ *
+ * For each submitted segment request, a notification will come over
+ * the NEP endpoint and a transfer result (struct xfer_result) will
+ * arrive in the DTI URB. Read it, get the xfer ID, see if there is
+ * data coming (inbound transfer), schedule a read and handle it.
+ *
+ * Sounds simple, it is a pain to implement.
+ *
+ *
+ * ENTRY POINTS
+ *
+ * FIXME
+ *
+ * LIFE CYCLE / STATE DIAGRAM
+ *
+ * FIXME
+ *
+ * THIS CODE IS DISGUSTING
+ *
+ * Warned you are; it's my second try and still not happy with it.
+ *
+ * NOTES:
+ *
+ * - No iso
+ *
+ * - Supports DMA xfers, control, bulk and maybe interrupt
+ *
+ * - Does not recycle unused rpipes
+ *
+ * An rpipe is assigned to an endpoint the first time it is used,
+ * and then it's there, assigned, until the endpoint is disabled
+ * (destroyed [{h,d}wahc_op_ep_disable()]. The assignment of the
+ * rpipe to the endpoint is done under the wa->rpipe_sem semaphore
+ * (should be a mutex).
+ *
+ * Two methods it could be done:
+ *
+ * (a) set up a timer everytime an rpipe's use count drops to 1
+ * (which means unused) or when a transfer ends. Reset the
+ * timer when a xfer is queued. If the timer expires, release
+ * the rpipe [see rpipe_ep_disable()].
+ *
+ * (b) when looking for free rpipes to attach [rpipe_get_by_ep()],
+ * when none are found go over the list, check their endpoint
+ * and their activity record (if no last-xfer-done-ts in the
+ * last x seconds) take it
+ *
+ * However, due to the fact that we have a set of limited
+ * resources (max-segments-at-the-same-time per xfer,
+ * xfers-per-ripe, blocks-per-rpipe, rpipes-per-host), at the end
+ * we are going to have to rebuild all this based on an scheduler,
+ * to where we have a list of transactions to do and based on the
+ * availability of the different requried components (blocks,
+ * rpipes, segment slots, etc), we go scheduling them. Painful.
+ */
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/hash.h>
+#include "wa-hc.h"
+#include "wusbhc.h"
+
+#undef D_LOCAL
+#define D_LOCAL 0 /* 0 disabled, > 0 different levels... */
+#include <linux/uwb/debug.h>
+
+enum {
+ WA_SEGS_MAX = 255,
+};
+
+enum wa_seg_status {
+ WA_SEG_NOTREADY,
+ WA_SEG_READY,
+ WA_SEG_DELAYED,
+ WA_SEG_SUBMITTED,
+ WA_SEG_PENDING,
+ WA_SEG_DTI_PENDING,
+ WA_SEG_DONE,
+ WA_SEG_ERROR,
+ WA_SEG_ABORTED,
+};
+
+static void wa_xfer_delayed_run(struct wa_rpipe *);
+
+/*
+ * Life cycle governed by 'struct urb' (the refcount of the struct is
+ * that of the 'struct urb' and usb_free_urb() would free the whole
+ * struct).
+ */
+struct wa_seg {
+ struct urb urb;
+ struct urb *dto_urb; /* for data output? */
+ struct list_head list_node; /* for rpipe->req_list */
+ struct wa_xfer *xfer; /* out xfer */
+ u8 index; /* which segment we are */
+ enum wa_seg_status status;
+ ssize_t result; /* bytes xfered or error */
+ struct wa_xfer_hdr xfer_hdr;
+ u8 xfer_extra[]; /* xtra space for xfer_hdr_ctl */
+};
+
+static void wa_seg_init(struct wa_seg *seg)
+{
+ /* usb_init_urb() repeats a lot of work, so we do it here */
+ kref_init(&seg->urb.kref);
+}
+
+/*
+ * Protected by xfer->lock
+ *
+ */
+struct wa_xfer {
+ struct kref refcnt;
+ struct list_head list_node;
+ spinlock_t lock;
+ u32 id;
+
+ struct wahc *wa; /* Wire adapter we are plugged to */
+ struct usb_host_endpoint *ep;
+ struct urb *urb; /* URB we are transfering for */
+ struct wa_seg **seg; /* transfer segments */
+ u8 segs, segs_submitted, segs_done;
+ unsigned is_inbound:1;
+ unsigned is_dma:1;
+ size_t seg_size;
+ int result;
+
+ gfp_t gfp; /* allocation mask */
+
+ struct wusb_dev *wusb_dev; /* for activity timestamps */
+};
+
+static inline void wa_xfer_init(struct wa_xfer *xfer)
+{
+ kref_init(&xfer->refcnt);
+ INIT_LIST_HEAD(&xfer->list_node);
+ spin_lock_init(&xfer->lock);
+}
+
+/*
+ * Destory a transfer structure
+ *
+ * Note that the xfer->seg[index] thingies follow the URB life cycle,
+ * so we need to put them, not free them.
+ */
+static void wa_xfer_destroy(struct kref *_xfer)
+{
+ struct wa_xfer *xfer = container_of(_xfer, struct wa_xfer, refcnt);
+ if (xfer->seg) {
+ unsigned cnt;
+ for (cnt = 0; cnt < xfer->segs; cnt++) {
+ if (xfer->is_inbound)
+ usb_put_urb(xfer->seg[cnt]->dto_urb);
+ usb_put_urb(&xfer->seg[cnt]->urb);
+ }
+ }
+ kfree(xfer);
+ d_printf(2, NULL, "xfer %p destroyed\n", xfer);
+}
+
+static void wa_xfer_get(struct wa_xfer *xfer)
+{
+ kref_get(&xfer->refcnt);
+}
+
+static void wa_xfer_put(struct wa_xfer *xfer)
+{
+ d_fnstart(3, NULL, "(xfer %p) -- ref count bef put %d\n",
+ xfer, atomic_read(&xfer->refcnt.refcount));
+ kref_put(&xfer->refcnt, wa_xfer_destroy);
+ d_fnend(3, NULL, "(xfer %p) = void\n", xfer);
+}
+
+/*
+ * xfer is referenced
+ *
+ * xfer->lock has to be unlocked
+ *
+ * We take xfer->lock for setting the result; this is a barrier
+ * against drivers/usb/core/hcd.c:unlink1() being called after we call
+ * usb_hcd_giveback_urb() and wa_urb_dequeue() trying to get a
+ * reference to the transfer.
+ */
+static void wa_xfer_giveback(struct wa_xfer *xfer)
+{
+ unsigned long flags;
+ d_fnstart(3, NULL, "(xfer %p)\n", xfer);
+ spin_lock_irqsave(&xfer->wa->xfer_list_lock, flags);
+ list_del_init(&xfer->list_node);
+ spin_unlock_irqrestore(&xfer->wa->xfer_list_lock, flags);
+ /* FIXME: segmentation broken -- kills DWA */
+ wusbhc_giveback_urb(xfer->wa->wusb, xfer->urb, xfer->result);
+ wa_put(xfer->wa);
+ wa_xfer_put(xfer);
+ d_fnend(3, NULL, "(xfer %p) = void\n", xfer);
+}
+
+/*
+ * xfer is referenced
+ *
+ * xfer->lock has to be unlocked
+ */
+static void wa_xfer_completion(struct wa_xfer *xfer)
+{
+ d_fnstart(3, NULL, "(xfer %p)\n", xfer);
+ if (xfer->wusb_dev)
+ wusb_dev_put(xfer->wusb_dev);
+ rpipe_put(xfer->ep->hcpriv);
+ wa_xfer_giveback(xfer);
+ d_fnend(3, NULL, "(xfer %p) = void\n", xfer);
+ return;
+}
+
+/*
+ * If transfer is done, wrap it up and return true
+ *
+ * xfer->lock has to be locked
+ */
+static unsigned __wa_xfer_is_done(struct wa_xfer *xfer)
+{
+ unsigned result, cnt;
+ struct wa_seg *seg;
+ struct urb *urb = xfer->urb;
+ unsigned found_short = 0;
+
+ d_fnstart(3, NULL, "(xfer %p)\n", xfer);
+ result = xfer->segs_done == xfer->segs_submitted;
+ if (result == 0)
+ goto out;
+ urb->actual_length = 0;
+ for (cnt = 0; cnt < xfer->segs; cnt++) {
+ seg = xfer->seg[cnt];
+ switch (seg->status) {
+ case WA_SEG_DONE:
+ if (found_short && seg->result > 0) {
+ if (printk_ratelimit())
+ printk(KERN_ERR "xfer %p#%u: bad short "
+ "segments (%zu)\n", xfer, cnt,
+ seg->result);
+ urb->status = -EINVAL;
+ goto out;
+ }
+ urb->actual_length += seg->result;
+ if (seg->result < xfer->seg_size
+ && cnt != xfer->segs-1)
+ found_short = 1;
+ d_printf(2, NULL, "xfer %p#%u: DONE short %d "
+ "result %zu urb->actual_length %d\n",
+ xfer, seg->index, found_short, seg->result,
+ urb->actual_length);
+ break;
+ case WA_SEG_ERROR:
+ xfer->result = seg->result;
+ d_printf(2, NULL, "xfer %p#%u: ERROR result %zu\n",
+ xfer, seg->index, seg->result);
+ goto out;
+ case WA_SEG_ABORTED:
+ WARN_ON(urb->status != -ECONNRESET
+ && urb->status != -ENOENT);
+ d_printf(2, NULL, "xfer %p#%u ABORTED: result %d\n",
+ xfer, seg->index, urb->status);
+ xfer->result = urb->status;
+ goto out;
+ default:
+ /* if (printk_ratelimit()) */
+ printk(KERN_ERR "xfer %p#%u: "
+ "is_done bad state %d\n",
+ xfer, cnt, seg->status);
+ xfer->result = -EINVAL;
+ WARN_ON(1);
+ goto out;
+ }
+ }
+ xfer->result = 0;
+out:
+ d_fnend(3, NULL, "(xfer %p) = void\n", xfer);
+ return result;
+}
+
+/*
+ * Initialize a transfer's ID
+ *
+ * We need to use a sequential number; if we use the pointer or the
+ * hash of the pointer, it can repeat over sequential transfers and
+ * then it will confuse the HWA....wonder why in hell they put a 32
+ * bit handle in there then.
+ */
+static void wa_xfer_id_init(struct wa_xfer *xfer)
+{
+ xfer->id = atomic_add_return(1, &xfer->wa->xfer_id_count);
+}
+
+/*
+ * Return the xfer's ID associated with xfer
+ *
+ * Need to generate a
+ */
+static u32 wa_xfer_id(struct wa_xfer *xfer)
+{
+ return xfer->id;
+}
+
+/*
+ * Search for a transfer list ID on the HCD's URB list
+ *
+ * For 32 bit architectures, we use the pointer itself; for 64 bits, a
+ * 32-bit hash of the pointer.
+ *
+ * @returns NULL if not found.
+ */
+static struct wa_xfer *wa_xfer_get_by_id(struct wahc *wa, u32 id)
+{
+ unsigned long flags;
+ struct wa_xfer *xfer_itr;
+ spin_lock_irqsave(&wa->xfer_list_lock, flags);
+ list_for_each_entry(xfer_itr, &wa->xfer_list, list_node) {
+ if (id == xfer_itr->id) {
+ wa_xfer_get(xfer_itr);
+ goto out;
+ }
+ }
+ xfer_itr = NULL;
+out:
+ spin_unlock_irqrestore(&wa->xfer_list_lock, flags);
+ return xfer_itr;
+}
+
+struct wa_xfer_abort_buffer {
+ struct urb urb;
+ struct wa_xfer_abort cmd;
+};
+
+static void __wa_xfer_abort_cb(struct urb *urb)
+{
+ struct wa_xfer_abort_buffer *b = urb->context;
+ usb_put_urb(&b->urb);
+}
+
+/*
+ * Aborts an ongoing transaction
+ *
+ * Assumes the transfer is referenced and locked and in a submitted
+ * state (mainly that there is an endpoint/rpipe assigned).
+ *
+ * The callback (see above) does nothing but freeing up the data by
+ * putting the URB. Because the URB is allocated at the head of the
+ * struct, the whole space we allocated is kfreed.
+ *
+ * We'll get an 'aborted transaction' xfer result on DTI, that'll
+ * politely ignore because at this point the transaction has been
+ * marked as aborted already.
+ */
+static void __wa_xfer_abort(struct wa_xfer *xfer)
+{
+ int result;
+ struct device *dev = &xfer->wa->usb_iface->dev;
+ struct wa_xfer_abort_buffer *b;
+ struct wa_rpipe *rpipe = xfer->ep->hcpriv;
+
+ b = kmalloc(sizeof(*b), GFP_ATOMIC);
+ if (b == NULL)
+ goto error_kmalloc;
+ b->cmd.bLength = sizeof(b->cmd);
+ b->cmd.bRequestType = WA_XFER_ABORT;
+ b->cmd.wRPipe = rpipe->descr.wRPipeIndex;
+ b->cmd.dwTransferID = wa_xfer_id(xfer);
+
+ usb_init_urb(&b->urb);
+ usb_fill_bulk_urb(&b->urb, xfer->wa->usb_dev,
+ usb_sndbulkpipe(xfer->wa->usb_dev,
+ xfer->wa->dto_epd->bEndpointAddress),
+ &b->cmd, sizeof(b->cmd), __wa_xfer_abort_cb, b);
+ result = usb_submit_urb(&b->urb, GFP_ATOMIC);
+ if (result < 0)
+ goto error_submit;
+ return; /* callback frees! */
+
+
+error_submit:
+ if (printk_ratelimit())
+ dev_err(dev, "xfer %p: Can't submit abort request: %d\n",
+ xfer, result);
+ kfree(b);
+error_kmalloc:
+ return;
+
+}
+
+/*
+ *
+ * @returns < 0 on error, transfer segment request size if ok
+ */
+static ssize_t __wa_xfer_setup_sizes(struct wa_xfer *xfer,
+ enum wa_xfer_type *pxfer_type)
+{
+ ssize_t result;
+ struct device *dev = &xfer->wa->usb_iface->dev;
+ size_t maxpktsize;
+ struct urb *urb = xfer->urb;
+ struct wa_rpipe *rpipe = xfer->ep->hcpriv;
+
+ d_fnstart(3, dev, "(xfer %p [rpipe %p] urb %p)\n",
+ xfer, rpipe, urb);
+ switch (rpipe->descr.bmAttribute & 0x3) {
+ case USB_ENDPOINT_XFER_CONTROL:
+ *pxfer_type = WA_XFER_TYPE_CTL;
+ result = sizeof(struct wa_xfer_ctl);
+ break;
+ case USB_ENDPOINT_XFER_INT:
+ case USB_ENDPOINT_XFER_BULK:
+ *pxfer_type = WA_XFER_TYPE_BI;
+ result = sizeof(struct wa_xfer_bi);
+ break;
+ case USB_ENDPOINT_XFER_ISOC:
+ dev_err(dev, "FIXME: ISOC not implemented\n");
+ result = -ENOSYS;
+ goto error;
+ default:
+ /* never happens */
+ BUG();
+ result = -EINVAL; /* shut gcc up */
+ };
+ xfer->is_inbound = urb->pipe & USB_DIR_IN ? 1 : 0;
+ xfer->is_dma = urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP ? 1 : 0;
+ xfer->seg_size = le16_to_cpu(rpipe->descr.wBlocks)
+ * 1 << (xfer->wa->wa_descr->bRPipeBlockSize - 1);
+ /* Compute the segment size and make sure it is a multiple of
+ * the maxpktsize (WUSB1.0[8.3.3.1])...not really too much of
+ * a check (FIXME) */
+ maxpktsize = le16_to_cpu(rpipe->descr.wMaxPacketSize);
+ if (xfer->seg_size < maxpktsize) {
+ dev_err(dev, "HW BUG? seg_size %zu smaller than maxpktsize "
+ "%zu\n", xfer->seg_size, maxpktsize);
+ result = -EINVAL;
+ goto error;
+ }
+ xfer->seg_size = (xfer->seg_size / maxpktsize) * maxpktsize;
+ xfer->segs = (urb->transfer_buffer_length + xfer->seg_size - 1)
+ / xfer->seg_size;
+ if (xfer->segs >= WA_SEGS_MAX) {
+ dev_err(dev, "BUG? ops, number of segments %d bigger than %d\n",
+ (int)(urb->transfer_buffer_length / xfer->seg_size),
+ WA_SEGS_MAX);
+ result = -EINVAL;
+ goto error;
+ }
+ if (xfer->segs == 0 && *pxfer_type == WA_XFER_TYPE_CTL)
+ xfer->segs = 1;
+error:
+ d_fnend(3, dev, "(xfer %p [rpipe %p] urb %p) = %d\n",
+ xfer, rpipe, urb, (int)result);
+ return result;
+}
+
+/** Fill in the common request header and xfer-type specific data. */
+static void __wa_xfer_setup_hdr0(struct wa_xfer *xfer,
+ struct wa_xfer_hdr *xfer_hdr0,
+ enum wa_xfer_type xfer_type,
+ size_t xfer_hdr_size)
+{
+ struct wa_rpipe *rpipe = xfer->ep->hcpriv;
+
+ xfer_hdr0 = &xfer->seg[0]->xfer_hdr;
+ xfer_hdr0->bLength = xfer_hdr_size;
+ xfer_hdr0->bRequestType = xfer_type;
+ xfer_hdr0->wRPipe = rpipe->descr.wRPipeIndex;
+ xfer_hdr0->dwTransferID = wa_xfer_id(xfer);
+ xfer_hdr0->bTransferSegment = 0;
+ switch (xfer_type) {
+ case WA_XFER_TYPE_CTL: {
+ struct wa_xfer_ctl *xfer_ctl =
+ container_of(xfer_hdr0, struct wa_xfer_ctl, hdr);
+ xfer_ctl->bmAttribute = xfer->is_inbound ? 1 : 0;
+ BUG_ON(xfer->urb->transfer_flags & URB_NO_SETUP_DMA_MAP
+ && xfer->urb->setup_packet == NULL);
+ memcpy(&xfer_ctl->baSetupData, xfer->urb->setup_packet,
+ sizeof(xfer_ctl->baSetupData));
+ break;
+ }
+ case WA_XFER_TYPE_BI:
+ break;
+ case WA_XFER_TYPE_ISO:
+ printk(KERN_ERR "FIXME: ISOC not implemented\n");
+ default:
+ BUG();
+ };
+}
+
+/*
+ * Callback for the OUT data phase of the segment request
+ *
+ * Check wa_seg_cb(); most comments also apply here because this
+ * function does almost the same thing and they work closely
+ * together.
+ *
+ * If the seg request has failed but this DTO phase has suceeded,
+ * wa_seg_cb() has already failed the segment and moved the
+ * status to WA_SEG_ERROR, so this will go through 'case 0' and
+ * effectively do nothing.
+ */
+static void wa_seg_dto_cb(struct urb *urb)
+{
+ struct wa_seg *seg = urb->context;
+ struct wa_xfer *xfer = seg->xfer;
+ struct wahc *wa;
+ struct device *dev;
+ struct wa_rpipe *rpipe;
+ unsigned long flags;
+ unsigned rpipe_ready = 0;
+ u8 done = 0;
+
+ d_fnstart(3, NULL, "(urb %p [%d])\n", urb, urb->status);
+ switch (urb->status) {
+ case 0:
+ spin_lock_irqsave(&xfer->lock, flags);
+ wa = xfer->wa;
+ dev = &wa->usb_iface->dev;
+ d_printf(2, dev, "xfer %p#%u: data out done (%d bytes)\n",
+ xfer, seg->index, urb->actual_length);
+ if (seg->status < WA_SEG_PENDING)
+ seg->status = WA_SEG_PENDING;
+ seg->result = urb->actual_length;
+ spin_unlock_irqrestore(&xfer->lock, flags);
+ break;
+ case -ECONNRESET: /* URB unlinked; no need to do anything */
+ case -ENOENT: /* as it was done by the who unlinked us */
+ break;
+ default: /* Other errors ... */
+ spin_lock_irqsave(&xfer->lock, flags);
+ wa = xfer->wa;
+ dev = &wa->usb_iface->dev;
+ rpipe = xfer->ep->hcpriv;
+ if (printk_ratelimit())
+ dev_err(dev, "xfer %p#%u: data out error %d\n",
+ xfer, seg->index, urb->status);
+ if (edc_inc(&wa->nep_edc, EDC_MAX_ERRORS,
+ EDC_ERROR_TIMEFRAME)){
+ dev_err(dev, "DTO: URB max acceptable errors "
+ "exceeded, resetting device\n");
+ wa_reset_all(wa);
+ }
+ if (seg->status != WA_SEG_ERROR) {
+ seg->status = WA_SEG_ERROR;
+ seg->result = urb->status;
+ xfer->segs_done++;
+ __wa_xfer_abort(xfer);
+ rpipe_ready = rpipe_avail_inc(rpipe);
+ done = __wa_xfer_is_done(xfer);
+ }
+ spin_unlock_irqrestore(&xfer->lock, flags);
+ if (done)
+ wa_xfer_completion(xfer);
+ if (rpipe_ready)
+ wa_xfer_delayed_run(rpipe);
+ }
+ d_fnend(3, NULL, "(urb %p [%d]) = void\n", urb, urb->status);
+}
+
+/*
+ * Callback for the segment request
+ *
+ * If succesful transition state (unless already transitioned or
+ * outbound transfer); otherwise, take a note of the error, mark this
+ * segment done and try completion.
+ *
+ * Note we don't access until we are sure that the transfer hasn't
+ * been cancelled (ECONNRESET, ENOENT), which could mean that
+ * seg->xfer could be already gone.
+ *
+ * We have to check before setting the status to WA_SEG_PENDING
+ * because sometimes the xfer result callback arrives before this
+ * callback (geeeeeeze), so it might happen that we are already in
+ * another state. As well, we don't set it if the transfer is inbound,
+ * as in that case, wa_seg_dto_cb will do it when the OUT data phase
+ * finishes.
+ */
+static void wa_seg_cb(struct urb *urb)
+{
+ struct wa_seg *seg = urb->context;
+ struct wa_xfer *xfer = seg->xfer;
+ struct wahc *wa;
+ struct device *dev;
+ struct wa_rpipe *rpipe;
+ unsigned long flags;
+ unsigned rpipe_ready;
+ u8 done = 0;
+
+ d_fnstart(3, NULL, "(urb %p [%d])\n", urb, urb->status);
+ switch (urb->status) {
+ case 0:
+ spin_lock_irqsave(&xfer->lock, flags);
+ wa = xfer->wa;
+ dev = &wa->usb_iface->dev;
+ d_printf(2, dev, "xfer %p#%u: request done\n",
+ xfer, seg->index);
+ if (xfer->is_inbound && seg->status < WA_SEG_PENDING)
+ seg->status = WA_SEG_PENDING;
+ spin_unlock_irqrestore(&xfer->lock, flags);
+ break;
+ case -ECONNRESET: /* URB unlinked; no need to do anything */
+ case -ENOENT: /* as it was done by the who unlinked us */
+ break;
+ default: /* Other errors ... */
+ spin_lock_irqsave(&xfer->lock, flags);
+ wa = xfer->wa;
+ dev = &wa->usb_iface->dev;
+ rpipe = xfer->ep->hcpriv;
+ if (printk_ratelimit())
+ dev_err(dev, "xfer %p#%u: request error %d\n",
+ xfer, seg->index, urb->status);
+ if (edc_inc(&wa->nep_edc, EDC_MAX_ERRORS,
+ EDC_ERROR_TIMEFRAME)){
+ dev_err(dev, "DTO: URB max acceptable errors "
+ "exceeded, resetting device\n");
+ wa_reset_all(wa);
+ }
+ usb_unlink_urb(seg->dto_urb);
+ seg->status = WA_SEG_ERROR;
+ seg->result = urb->status;
+ xfer->segs_done++;
+ __wa_xfer_abort(xfer);
+ rpipe_ready = rpipe_avail_inc(rpipe);
+ done = __wa_xfer_is_done(xfer);
+ spin_unlock_irqrestore(&xfer->lock, flags);
+ if (done)
+ wa_xfer_completion(xfer);
+ if (rpipe_ready)
+ wa_xfer_delayed_run(rpipe);
+ }
+ d_fnend(3, NULL, "(urb %p [%d]) = void\n", urb, urb->status);
+}
+
+/*
+ * Allocate the segs array and initialize each of them
+ *
+ * The segments are freed by wa_xfer_destroy() when the xfer use count
+ * drops to zero; however, because each segment is given the same life
+ * cycle as the USB URB it contains, it is actually freed by
+ * usb_put_urb() on the contained USB URB (twisted, eh?).
+ */
+static int __wa_xfer_setup_segs(struct wa_xfer *xfer, size_t xfer_hdr_size)
+{
+ int result, cnt;
+ size_t alloc_size = sizeof(*xfer->seg[0])
+ - sizeof(xfer->seg[0]->xfer_hdr) + xfer_hdr_size;
+ struct usb_device *usb_dev = xfer->wa->usb_dev;
+ const struct usb_endpoint_descriptor *dto_epd = xfer->wa->dto_epd;
+ struct wa_seg *seg;
+ size_t buf_itr, buf_size, buf_itr_size;
+
+ result = -ENOMEM;
+ xfer->seg = kzalloc(xfer->segs * sizeof(xfer->seg[0]), GFP_ATOMIC);
+ if (xfer->seg == NULL)
+ goto error_segs_kzalloc;
+ buf_itr = 0;
+ buf_size = xfer->urb->transfer_buffer_length;
+ for (cnt = 0; cnt < xfer->segs; cnt++) {
+ seg = xfer->seg[cnt] = kzalloc(alloc_size, GFP_ATOMIC);
+ if (seg == NULL)
+ goto error_seg_kzalloc;
+ wa_seg_init(seg);
+ seg->xfer = xfer;
+ seg->index = cnt;
+ usb_fill_bulk_urb(&seg->urb, usb_dev,
+ usb_sndbulkpipe(usb_dev,
+ dto_epd->bEndpointAddress),
+ &seg->xfer_hdr, xfer_hdr_size,
+ wa_seg_cb, seg);
+ buf_itr_size = buf_size > xfer->seg_size ?
+ xfer->seg_size : buf_size;
+ if (xfer->is_inbound == 0 && buf_size > 0) {
+ seg->dto_urb = usb_alloc_urb(0, GFP_ATOMIC);
+ if (seg->dto_urb == NULL)
+ goto error_dto_alloc;
+ usb_fill_bulk_urb(
+ seg->dto_urb, usb_dev,
+ usb_sndbulkpipe(usb_dev,
+ dto_epd->bEndpointAddress),
+ NULL, 0, wa_seg_dto_cb, seg);
+ if (xfer->is_dma) {
+ seg->dto_urb->transfer_dma =
+ xfer->urb->transfer_dma + buf_itr;
+ seg->dto_urb->transfer_flags |=
+ URB_NO_TRANSFER_DMA_MAP;
+ } else
+ seg->dto_urb->transfer_buffer =
+ xfer->urb->transfer_buffer + buf_itr;
+ seg->dto_urb->transfer_buffer_length = buf_itr_size;
+ }
+ seg->status = WA_SEG_READY;
+ buf_itr += buf_itr_size;
+ buf_size -= buf_itr_size;
+ }
+ return 0;
+
+error_dto_alloc:
+ kfree(xfer->seg[cnt]);
+ cnt--;
+error_seg_kzalloc:
+ /* use the fact that cnt is left at were it failed */
+ for (; cnt > 0; cnt--) {
+ if (xfer->is_inbound == 0)
+ kfree(xfer->seg[cnt]->dto_urb);
+ kfree(xfer->seg[cnt]);
+ }
+error_segs_kzalloc:
+ return result;
+}
+
+/*
+ * Allocates all the stuff needed to submit a transfer
+ *
+ * Breaks the whole data buffer in a list of segments, each one has a
+ * structure allocated to it and linked in xfer->seg[index]
+ *
+ * FIXME: merge setup_segs() and the last part of this function, no
+ * need to do two for loops when we could run everything in a
+ * single one
+ */
+static int __wa_xfer_setup(struct wa_xfer *xfer, struct urb *urb)
+{
+ int result;
+ struct device *dev = &xfer->wa->usb_iface->dev;
+ enum wa_xfer_type xfer_type = 0; /* shut up GCC */
+ size_t xfer_hdr_size, cnt, transfer_size;
+ struct wa_xfer_hdr *xfer_hdr0, *xfer_hdr;
+
+ d_fnstart(3, dev, "(xfer %p [rpipe %p] urb %p)\n",
+ xfer, xfer->ep->hcpriv, urb);
+
+ result = __wa_xfer_setup_sizes(xfer, &xfer_type);
+ if (result < 0)
+ goto error_setup_sizes;
+ xfer_hdr_size = result;
+ result = __wa_xfer_setup_segs(xfer, xfer_hdr_size);
+ if (result < 0) {
+ dev_err(dev, "xfer %p: Failed to allocate %d segments: %d\n",
+ xfer, xfer->segs, result);
+ goto error_setup_segs;
+ }
+ /* Fill the first header */
+ xfer_hdr0 = &xfer->seg[0]->xfer_hdr;
+ wa_xfer_id_init(xfer);
+ __wa_xfer_setup_hdr0(xfer, xfer_hdr0, xfer_type, xfer_hdr_size);
+
+ /* Fill remainig headers */
+ xfer_hdr = xfer_hdr0;
+ transfer_size = urb->transfer_buffer_length;
+ xfer_hdr0->dwTransferLength = transfer_size > xfer->seg_size ?
+ xfer->seg_size : transfer_size;
+ transfer_size -= xfer->seg_size;
+ for (cnt = 1; cnt < xfer->segs; cnt++) {
+ xfer_hdr = &xfer->seg[cnt]->xfer_hdr;
+ memcpy(xfer_hdr, xfer_hdr0, xfer_hdr_size);
+ xfer_hdr->bTransferSegment = cnt;
+ xfer_hdr->dwTransferLength = transfer_size > xfer->seg_size ?
+ cpu_to_le32(xfer->seg_size)
+ : cpu_to_le32(transfer_size);
+ xfer->seg[cnt]->status = WA_SEG_READY;
+ transfer_size -= xfer->seg_size;
+ }
+ xfer_hdr->bTransferSegment |= 0x80; /* this is the last segment */
+ result = 0;
+error_setup_segs:
+error_setup_sizes:
+ d_fnend(3, dev, "(xfer %p [rpipe %p] urb %p) = %d\n",
+ xfer, xfer->ep->hcpriv, urb, result);
+ return result;
+}
+
+/*
+ *
+ *
+ * rpipe->seg_lock is held!
+ */
+static int __wa_seg_submit(struct wa_rpipe *rpipe, struct wa_xfer *xfer,
+ struct wa_seg *seg)
+{
+ int result;
+ result = usb_submit_urb(&seg->urb, GFP_ATOMIC);
+ if (result < 0) {
+ printk(KERN_ERR "xfer %p#%u: REQ submit failed: %d\n",
+ xfer, seg->index, result);
+ goto error_seg_submit;
+ }
+ if (seg->dto_urb) {
+ result = usb_submit_urb(seg->dto_urb, GFP_ATOMIC);
+ if (result < 0) {
+ printk(KERN_ERR "xfer %p#%u: DTO submit failed: %d\n",
+ xfer, seg->index, result);
+ goto error_dto_submit;
+ }
+ }
+ seg->status = WA_SEG_SUBMITTED;
+ rpipe_avail_dec(rpipe);
+ return 0;
+
+error_dto_submit:
+ usb_unlink_urb(&seg->urb);
+error_seg_submit:
+ seg->status = WA_SEG_ERROR;
+ seg->result = result;
+ return result;
+}
+
+/*
+ * Execute more queued request segments until the maximum concurrent allowed
+ *
+ * The ugly unlock/lock sequence on the error path is needed as the
+ * xfer->lock normally nests the seg_lock and not viceversa.
+ *
+ */
+static void wa_xfer_delayed_run(struct wa_rpipe *rpipe)
+{
+ int result;
+ struct device *dev = &rpipe->wa->usb_iface->dev;
+ struct wa_seg *seg;
+ struct wa_xfer *xfer;
+ unsigned long flags;
+
+ d_fnstart(1, dev, "(rpipe #%d) %d segments available\n",
+ le16_to_cpu(rpipe->descr.wRPipeIndex),
+ atomic_read(&rpipe->segs_available));
+ spin_lock_irqsave(&rpipe->seg_lock, flags);
+ while (atomic_read(&rpipe->segs_available) > 0
+ && !list_empty(&rpipe->seg_list)) {
+ seg = list_entry(rpipe->seg_list.next, struct wa_seg,
+ list_node);
+ list_del(&seg->list_node);
+ xfer = seg->xfer;
+ result = __wa_seg_submit(rpipe, xfer, seg);
+ d_printf(1, dev, "xfer %p#%u submitted from delayed "
+ "[%d segments available] %d\n",
+ xfer, seg->index,
+ atomic_read(&rpipe->segs_available), result);
+ if (unlikely(result < 0)) {
+ spin_unlock_irqrestore(&rpipe->seg_lock, flags);
+ spin_lock_irqsave(&xfer->lock, flags);
+ __wa_xfer_abort(xfer);
+ xfer->segs_done++;
+ spin_unlock_irqrestore(&xfer->lock, flags);
+ spin_lock_irqsave(&rpipe->seg_lock, flags);
+ }
+ }
+ spin_unlock_irqrestore(&rpipe->seg_lock, flags);
+ d_fnend(1, dev, "(rpipe #%d) = void, %d segments available\n",
+ le16_to_cpu(rpipe->descr.wRPipeIndex),
+ atomic_read(&rpipe->segs_available));
+
+}
+
+/*
+ *
+ * xfer->lock is taken
+ *
+ * On failure submitting we just stop submitting and return error;
+ * wa_urb_enqueue_b() will execute the completion path
+ */
+static int __wa_xfer_submit(struct wa_xfer *xfer)
+{
+ int result;
+ struct wahc *wa = xfer->wa;
+ struct device *dev = &wa->usb_iface->dev;
+ unsigned cnt;
+ struct wa_seg *seg;
+ unsigned long flags;
+ struct wa_rpipe *rpipe = xfer->ep->hcpriv;
+ size_t maxrequests = le16_to_cpu(rpipe->descr.wRequests);
+ u8 available;
+ u8 empty;
+
+ d_fnstart(3, dev, "(xfer %p [rpipe %p])\n",
+ xfer, xfer->ep->hcpriv);
+
+ spin_lock_irqsave(&wa->xfer_list_lock, flags);
+ list_add_tail(&xfer->list_node, &wa->xfer_list);
+ spin_unlock_irqrestore(&wa->xfer_list_lock, flags);
+
+ BUG_ON(atomic_read(&rpipe->segs_available) > maxrequests);
+ result = 0;
+ spin_lock_irqsave(&rpipe->seg_lock, flags);
+ for (cnt = 0; cnt < xfer->segs; cnt++) {
+ available = atomic_read(&rpipe->segs_available);
+ empty = list_empty(&rpipe->seg_list);
+ seg = xfer->seg[cnt];
+ d_printf(2, dev, "xfer %p#%u: available %u empty %u (%s)\n",
+ xfer, cnt, available, empty,
+ available == 0 || !empty ? "delayed" : "submitted");
+ if (available == 0 || !empty) {
+ d_printf(1, dev, "xfer %p#%u: delayed\n", xfer, cnt);
+ seg->status = WA_SEG_DELAYED;
+ list_add_tail(&seg->list_node, &rpipe->seg_list);
+ } else {
+ result = __wa_seg_submit(rpipe, xfer, seg);
+ if (result < 0)
+ goto error_seg_submit;
+ }
+ xfer->segs_submitted++;
+ }
+ spin_unlock_irqrestore(&rpipe->seg_lock, flags);
+ d_fnend(3, dev, "(xfer %p [rpipe %p]) = void\n", xfer,
+ xfer->ep->hcpriv);
+ return result;
+
+error_seg_submit:
+ __wa_xfer_abort(xfer);
+ spin_unlock_irqrestore(&rpipe->seg_lock, flags);
+ d_fnend(3, dev, "(xfer %p [rpipe %p]) = void\n", xfer,
+ xfer->ep->hcpriv);
+ return result;
+}
+
+/*
+ * Second part of a URB/transfer enqueuement
+ *
+ * Assumes this comes from wa_urb_enqueue() [maybe through
+ * wa_urb_enqueue_run()]. At this point:
+ *
+ * xfer->wa filled and refcounted
+ * xfer->ep filled with rpipe refcounted if
+ * delayed == 0
+ * xfer->urb filled and refcounted (this is the case when called
+ * from wa_urb_enqueue() as we come from usb_submit_urb()
+ * and when called by wa_urb_enqueue_run(), as we took an
+ * extra ref dropped by _run() after we return).
+ * xfer->gfp filled
+ *
+ * If we fail at __wa_xfer_submit(), then we just check if we are done
+ * and if so, we run the completion procedure. However, if we are not
+ * yet done, we do nothing and wait for the completion handlers from
+ * the submitted URBs or from the xfer-result path to kick in. If xfer
+ * result never kicks in, the xfer will timeout from the USB code and
+ * dequeue() will be called.
+ */
+static void wa_urb_enqueue_b(struct wa_xfer *xfer)
+{
+ int result;
+ unsigned long flags;
+ struct urb *urb = xfer->urb;
+ struct wahc *wa = xfer->wa;
+ struct wusbhc *wusbhc = wa->wusb;
+ struct device *dev = &wa->usb_iface->dev;
+ struct wusb_dev *wusb_dev;
+ unsigned done;
+
+ d_fnstart(3, dev, "(wa %p urb %p)\n", wa, urb);
+ result = rpipe_get_by_ep(wa, xfer->ep, urb, xfer->gfp);
+ if (result < 0)
+ goto error_rpipe_get;
+ result = -ENODEV;
+ /* FIXME: segmentation broken -- kills DWA */
+ mutex_lock(&wusbhc->mutex); /* get a WUSB dev */
+ if (urb->dev == NULL)
+ goto error_dev_gone;
+ wusb_dev = __wusb_dev_get_by_usb_dev(wusbhc, urb->dev);
+ if (wusb_dev == NULL) {
+ mutex_unlock(&wusbhc->mutex);
+ goto error_dev_gone;
+ }
+ mutex_unlock(&wusbhc->mutex);
+
+ spin_lock_irqsave(&xfer->lock, flags);
+ xfer->wusb_dev = wusb_dev;
+ result = urb->status;
+ if (urb->status != -EINPROGRESS)
+ goto error_dequeued;
+
+ result = __wa_xfer_setup(xfer, urb);
+ if (result < 0)
+ goto error_xfer_setup;
+ result = __wa_xfer_submit(xfer);
+ if (result < 0)
+ goto error_xfer_submit;
+ spin_unlock_irqrestore(&xfer->lock, flags);
+ d_fnend(3, dev, "(wa %p urb %p) = void\n", wa, urb);
+ return;
+
+ /* this is basically wa_xfer_completion() broken up wa_xfer_giveback()
+ * does a wa_xfer_put() that will call wa_xfer_destroy() and clean
+ * upundo setup().
+ */
+error_xfer_setup:
+error_dequeued:
+ spin_unlock_irqrestore(&xfer->lock, flags);
+ /* FIXME: segmentation broken, kills DWA */
+ if (wusb_dev)
+ wusb_dev_put(wusb_dev);
+error_dev_gone:
+ rpipe_put(xfer->ep->hcpriv);
+error_rpipe_get:
+ xfer->result = result;
+ wa_xfer_giveback(xfer);
+ d_fnend(3, dev, "(wa %p urb %p) = (void) %d\n", wa, urb, result);
+ return;
+
+error_xfer_submit:
+ done = __wa_xfer_is_done(xfer);
+ xfer->result = result;
+ spin_unlock_irqrestore(&xfer->lock, flags);
+ if (done)
+ wa_xfer_completion(xfer);
+ d_fnend(3, dev, "(wa %p urb %p) = (void) %d\n", wa, urb, result);
+ return;
+}
+
+/*
+ * Execute the delayed transfers in the Wire Adapter @wa
+ *
+ * We need to be careful here, as dequeue() could be called in the
+ * middle. That's why we do the whole thing under the
+ * wa->xfer_list_lock. If dequeue() jumps in, it first locks urb->lock
+ * and then checks the list -- so as we would be acquiring in inverse
+ * order, we just drop the lock once we have the xfer and reacquire it
+ * later.
+ */
+void wa_urb_enqueue_run(struct work_struct *ws)
+{
+ struct wahc *wa = container_of(ws, struct wahc, xfer_work);
+ struct device *dev = &wa->usb_iface->dev;
+ struct wa_xfer *xfer, *next;
+ struct urb *urb;
+
+ d_fnstart(3, dev, "(wa %p)\n", wa);
+ spin_lock_irq(&wa->xfer_list_lock);
+ list_for_each_entry_safe(xfer, next, &wa->xfer_delayed_list,
+ list_node) {
+ list_del_init(&xfer->list_node);
+ spin_unlock_irq(&wa->xfer_list_lock);
+
+ urb = xfer->urb;
+ wa_urb_enqueue_b(xfer);
+ usb_put_urb(urb); /* taken when queuing */
+
+ spin_lock_irq(&wa->xfer_list_lock);
+ }
+ spin_unlock_irq(&wa->xfer_list_lock);
+ d_fnend(3, dev, "(wa %p) = void\n", wa);
+}
+EXPORT_SYMBOL_GPL(wa_urb_enqueue_run);
+
+/*
+ * Submit a transfer to the Wire Adapter in a delayed way
+ *
+ * The process of enqueuing involves possible sleeps() [see
+ * enqueue_b(), for the rpipe_get() and the mutex_lock()]. If we are
+ * in an atomic section, we defer the enqueue_b() call--else we call direct.
+ *
+ * @urb: We own a reference to it done by the HCI Linux USB stack that
+ * will be given up by calling usb_hcd_giveback_urb() or by
+ * returning error from this function -> ergo we don't have to
+ * refcount it.
+ */
+int wa_urb_enqueue(struct wahc *wa, struct usb_host_endpoint *ep,
+ struct urb *urb, gfp_t gfp)
+{
+ int result;
+ struct device *dev = &wa->usb_iface->dev;
+ struct wa_xfer *xfer;
+ unsigned long my_flags;
+ unsigned cant_sleep = irqs_disabled() | in_atomic();
+
+ d_fnstart(3, dev, "(wa %p ep %p urb %p [%d] gfp 0x%x)\n",
+ wa, ep, urb, urb->transfer_buffer_length, gfp);
+
+ if (urb->transfer_buffer == NULL
+ && !(urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP)
+ && urb->transfer_buffer_length != 0) {
+ dev_err(dev, "BUG? urb %p: NULL xfer buffer & NODMA\n", urb);
+ dump_stack();
+ }
+
+ result = -ENOMEM;
+ xfer = kzalloc(sizeof(*xfer), gfp);
+ if (xfer == NULL)
+ goto error_kmalloc;
+
+ result = -ENOENT;
+ if (urb->status != -EINPROGRESS) /* cancelled */
+ goto error_dequeued; /* before starting? */
+ wa_xfer_init(xfer);
+ xfer->wa = wa_get(wa);
+ xfer->urb = urb;
+ xfer->gfp = gfp;
+ xfer->ep = ep;
+ urb->hcpriv = xfer;
+ d_printf(2, dev, "xfer %p urb %p pipe 0x%02x [%d bytes] %s %s %s\n",
+ xfer, urb, urb->pipe, urb->transfer_buffer_length,
+ urb->transfer_flags & URB_NO_TRANSFER_DMA_MAP ? "dma" : "nodma",
+ urb->pipe & USB_DIR_IN ? "inbound" : "outbound",
+ cant_sleep ? "deferred" : "inline");
+ if (cant_sleep) {
+ usb_get_urb(urb);
+ spin_lock_irqsave(&wa->xfer_list_lock, my_flags);
+ list_add_tail(&xfer->list_node, &wa->xfer_delayed_list);
+ spin_unlock_irqrestore(&wa->xfer_list_lock, my_flags);
+ queue_work(wusbd, &wa->xfer_work);
+ } else {
+ wa_urb_enqueue_b(xfer);
+ }
+ d_fnend(3, dev, "(wa %p ep %p urb %p [%d] gfp 0x%x) = 0\n",
+ wa, ep, urb, urb->transfer_buffer_length, gfp);
+ return 0;
+
+error_dequeued:
+ kfree(xfer);
+error_kmalloc:
+ d_fnend(3, dev, "(wa %p ep %p urb %p [%d] gfp 0x%x) = %d\n",
+ wa, ep, urb, urb->transfer_buffer_length, gfp, result);
+ return result;
+}
+EXPORT_SYMBOL_GPL(wa_urb_enqueue);
+
+/*
+ * Dequeue a URB and make sure uwb_hcd_giveback_urb() [completion
+ * handler] is called.
+ *
+ * Until a transfer goes successfully through wa_urb_enqueue() it
+ * needs to be dequeued with completion calling; when stuck in delayed
+ * or before wa_xfer_setup() is called, we need to do completion.
+ *
+ * not setup If there is no hcpriv yet, that means that that enqueue
+ * still had no time to set the xfer up. Because
+ * urb->status should be other than -EINPROGRESS,
+ * enqueue() will catch that and bail out.
+ *
+ * If the transfer has gone through setup, we just need to clean it
+ * up. If it has gone through submit(), we have to abort it [with an
+ * asynch request] and then make sure we cancel each segment.
+ *
+ */
+int wa_urb_dequeue(struct wahc *wa, struct urb *urb)
+{
+ struct device *dev = &wa->usb_iface->dev;
+ unsigned long flags, flags2;
+ struct wa_xfer *xfer;
+ struct wa_seg *seg;
+ struct wa_rpipe *rpipe;
+ unsigned cnt;
+ unsigned rpipe_ready = 0;
+
+ d_fnstart(3, dev, "(wa %p, urb %p)\n", wa, urb);
+
+ d_printf(1, dev, "xfer %p urb %p: aborting\n", urb->hcpriv, urb);
+ xfer = urb->hcpriv;
+ if (xfer == NULL) {
+ /* NOthing setup yet enqueue will see urb->status !=
+ * -EINPROGRESS (by hcd layer) and bail out with
+ * error, no need to do completion
+ */
+ BUG_ON(urb->status == -EINPROGRESS);
+ goto out;
+ }
+ spin_lock_irqsave(&xfer->lock, flags);
+ rpipe = xfer->ep->hcpriv;
+ /* Check the delayed list -> if there, release and complete */
+ spin_lock_irqsave(&wa->xfer_list_lock, flags2);
+ if (!list_empty(&xfer->list_node) && xfer->seg == NULL)
+ goto dequeue_delayed;
+ spin_unlock_irqrestore(&wa->xfer_list_lock, flags2);
+ if (xfer->seg == NULL) /* still hasn't reached */
+ goto out_unlock; /* setup(), enqueue_b() completes */
+ /* Ok, the xfer is in flight already, it's been setup and submitted.*/
+ __wa_xfer_abort(xfer);
+ for (cnt = 0; cnt < xfer->segs; cnt++) {
+ seg = xfer->seg[cnt];
+ switch (seg->status) {
+ case WA_SEG_NOTREADY:
+ case WA_SEG_READY:
+ printk(KERN_ERR "xfer %p#%u: dequeue bad state %u\n",
+ xfer, cnt, seg->status);
+ WARN_ON(1);
+ break;
+ case WA_SEG_DELAYED:
+ seg->status = WA_SEG_ABORTED;
+ spin_lock_irqsave(&rpipe->seg_lock, flags2);
+ list_del(&seg->list_node);
+ xfer->segs_done++;
+ rpipe_ready = rpipe_avail_inc(rpipe);
+ spin_unlock_irqrestore(&rpipe->seg_lock, flags2);
+ break;
+ case WA_SEG_SUBMITTED:
+ seg->status = WA_SEG_ABORTED;
+ usb_unlink_urb(&seg->urb);
+ if (xfer->is_inbound == 0)
+ usb_unlink_urb(seg->dto_urb);
+ xfer->segs_done++;
+ rpipe_ready = rpipe_avail_inc(rpipe);
+ break;
+ case WA_SEG_PENDING:
+ seg->status = WA_SEG_ABORTED;
+ xfer->segs_done++;
+ rpipe_ready = rpipe_avail_inc(rpipe);
+ break;
+ case WA_SEG_DTI_PENDING:
+ usb_unlink_urb(wa->dti_urb);
+ seg->status = WA_SEG_ABORTED;
+ xfer->segs_done++;
+ rpipe_ready = rpipe_avail_inc(rpipe);
+ break;
+ case WA_SEG_DONE:
+ case WA_SEG_ERROR:
+ case WA_SEG_ABORTED:
+ break;
+ }
+ }
+ xfer->result = urb->status; /* -ENOENT or -ECONNRESET */
+ __wa_xfer_is_done(xfer);
+ spin_unlock_irqrestore(&xfer->lock, flags);
+ wa_xfer_completion(xfer);
+ if (rpipe_ready)
+ wa_xfer_delayed_run(rpipe);
+ d_fnend(3, dev, "(wa %p, urb %p) = 0\n", wa, urb);
+ return 0;
+
+out_unlock:
+ spin_unlock_irqrestore(&xfer->lock, flags);
+out:
+ d_fnend(3, dev, "(wa %p, urb %p) = 0\n", wa, urb);
+ return 0;
+
+dequeue_delayed:
+ list_del_init(&xfer->list_node);
+ spin_unlock_irqrestore(&wa->xfer_list_lock, flags2);
+ xfer->result = urb->status;
+ spin_unlock_irqrestore(&xfer->lock, flags);
+ wa_xfer_giveback(xfer);
+ usb_put_urb(urb); /* we got a ref in enqueue() */
+ d_fnend(3, dev, "(wa %p, urb %p) = 0\n", wa, urb);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(wa_urb_dequeue);
+
+/*
+ * Translation from WA status codes (WUSB1.0 Table 8.15) to errno
+ * codes
+ *
+ * Positive errno values are internal inconsistencies and should be
+ * flagged louder. Negative are to be passed up to the user in the
+ * normal way.
+ *
+ * @status: USB WA status code -- high two bits are stripped.
+ */
+static int wa_xfer_status_to_errno(u8 status)
+{
+ int errno;
+ u8 real_status = status;
+ static int xlat[] = {
+ [WA_XFER_STATUS_SUCCESS] = 0,
+ [WA_XFER_STATUS_HALTED] = -EPIPE,
+ [WA_XFER_STATUS_DATA_BUFFER_ERROR] = -ENOBUFS,
+ [WA_XFER_STATUS_BABBLE] = -EOVERFLOW,
+ [WA_XFER_RESERVED] = EINVAL,
+ [WA_XFER_STATUS_NOT_FOUND] = 0,
+ [WA_XFER_STATUS_INSUFFICIENT_RESOURCE] = -ENOMEM,
+ [WA_XFER_STATUS_TRANSACTION_ERROR] = -EILSEQ,
+ [WA_XFER_STATUS_ABORTED] = -EINTR,
+ [WA_XFER_STATUS_RPIPE_NOT_READY] = EINVAL,
+ [WA_XFER_INVALID_FORMAT] = EINVAL,
+ [WA_XFER_UNEXPECTED_SEGMENT_NUMBER] = EINVAL,
+ [WA_XFER_STATUS_RPIPE_TYPE_MISMATCH] = EINVAL,
+ };
+ status &= 0x3f;
+
+ if (status == 0)
+ return 0;
+ if (status >= ARRAY_SIZE(xlat)) {
+ if (printk_ratelimit())
+ printk(KERN_ERR "%s(): BUG? "
+ "Unknown WA transfer status 0x%02x\n",
+ __func__, real_status);
+ return -EINVAL;
+ }
+ errno = xlat[status];
+ if (unlikely(errno > 0)) {
+ if (printk_ratelimit())
+ printk(KERN_ERR "%s(): BUG? "
+ "Inconsistent WA status: 0x%02x\n",
+ __func__, real_status);
+ errno = -errno;
+ }
+ return errno;
+}
+
+/*
+ * Process a xfer result completion message
+ *
+ * inbound transfers: need to schedule a DTI read
+ *
+ * FIXME: this functio needs to be broken up in parts
+ */
+static void wa_xfer_result_chew(struct wahc *wa, struct wa_xfer *xfer)
+{
+ int result;
+ struct device *dev = &wa->usb_iface->dev;
+ unsigned long flags;
+ u8 seg_idx;
+ struct wa_seg *seg;
+ struct wa_rpipe *rpipe;
+ struct wa_xfer_result *xfer_result = wa->xfer_result;
+ u8 done = 0;
+ u8 usb_status;
+ unsigned rpipe_ready = 0;
+
+ d_fnstart(3, dev, "(wa %p xfer %p)\n", wa, xfer);
+ spin_lock_irqsave(&xfer->lock, flags);
+ seg_idx = xfer_result->bTransferSegment & 0x7f;
+ if (unlikely(seg_idx >= xfer->segs))
+ goto error_bad_seg;
+ seg = xfer->seg[seg_idx];
+ rpipe = xfer->ep->hcpriv;
+ usb_status = xfer_result->bTransferStatus;
+ d_printf(2, dev, "xfer %p#%u: bTransferStatus 0x%02x (seg %u)\n",
+ xfer, seg_idx, usb_status, seg->status);
+ if (seg->status == WA_SEG_ABORTED
+ || seg->status == WA_SEG_ERROR) /* already handled */
+ goto segment_aborted;
+ if (seg->status == WA_SEG_SUBMITTED) /* ops, got here */
+ seg->status = WA_SEG_PENDING; /* before wa_seg{_dto}_cb() */
+ if (seg->status != WA_SEG_PENDING) {
+ if (printk_ratelimit())
+ dev_err(dev, "xfer %p#%u: Bad segment state %u\n",
+ xfer, seg_idx, seg->status);
+ seg->status = WA_SEG_PENDING; /* workaround/"fix" it */
+ }
+ if (usb_status & 0x80) {
+ seg->result = wa_xfer_status_to_errno(usb_status);
+ dev_err(dev, "DTI: xfer %p#%u failed (0x%02x)\n",
+ xfer, seg->index, usb_status);
+ goto error_complete;
+ }
+ /* FIXME: we ignore warnings, tally them for stats */
+ if (usb_status & 0x40) /* Warning?... */
+ usb_status = 0; /* ... pass */
+ if (xfer->is_inbound) { /* IN data phase: read to buffer */
+ seg->status = WA_SEG_DTI_PENDING;
+ BUG_ON(wa->buf_in_urb->status == -EINPROGRESS);
+ if (xfer->is_dma) {
+ wa->buf_in_urb->transfer_dma =
+ xfer->urb->transfer_dma
+ + seg_idx * xfer->seg_size;
+ wa->buf_in_urb->transfer_flags
+ |= URB_NO_TRANSFER_DMA_MAP;
+ } else {
+ wa->buf_in_urb->transfer_buffer =
+ xfer->urb->transfer_buffer
+ + seg_idx * xfer->seg_size;
+ wa->buf_in_urb->transfer_flags
+ &= ~URB_NO_TRANSFER_DMA_MAP;
+ }
+ wa->buf_in_urb->transfer_buffer_length =
+ le32_to_cpu(xfer_result->dwTransferLength);
+ wa->buf_in_urb->context = seg;
+ result = usb_submit_urb(wa->buf_in_urb, GFP_ATOMIC);
+ if (result < 0)
+ goto error_submit_buf_in;
+ } else {
+ /* OUT data phase, complete it -- */
+ seg->status = WA_SEG_DONE;
+ seg->result = le32_to_cpu(xfer_result->dwTransferLength);
+ xfer->segs_done++;
+ rpipe_ready = rpipe_avail_inc(rpipe);
+ done = __wa_xfer_is_done(xfer);
+ }
+ spin_unlock_irqrestore(&xfer->lock, flags);
+ if (done)
+ wa_xfer_completion(xfer);
+ if (rpipe_ready)
+ wa_xfer_delayed_run(rpipe);
+ d_fnend(3, dev, "(wa %p xfer %p) = void\n", wa, xfer);
+ return;
+
+
+error_submit_buf_in:
+ if (edc_inc(&wa->dti_edc, EDC_MAX_ERRORS, EDC_ERROR_TIMEFRAME)) {
+ dev_err(dev, "DTI: URB max acceptable errors "
+ "exceeded, resetting device\n");
+ wa_reset_all(wa);
+ }
+ if (printk_ratelimit())
+ dev_err(dev, "xfer %p#%u: can't submit DTI data phase: %d\n",
+ xfer, seg_idx, result);
+ seg->result = result;
+error_complete:
+ seg->status = WA_SEG_ERROR;
+ xfer->segs_done++;
+ rpipe_ready = rpipe_avail_inc(rpipe);
+ __wa_xfer_abort(xfer);
+ done = __wa_xfer_is_done(xfer);
+ spin_unlock_irqrestore(&xfer->lock, flags);
+ if (done)
+ wa_xfer_completion(xfer);
+ if (rpipe_ready)
+ wa_xfer_delayed_run(rpipe);
+ d_fnend(3, dev, "(wa %p xfer %p) = void [segment/DTI-submit error]\n",
+ wa, xfer);
+ return;
+
+
+error_bad_seg:
+ spin_unlock_irqrestore(&xfer->lock, flags);
+ wa_urb_dequeue(wa, xfer->urb);
+ if (printk_ratelimit())
+ dev_err(dev, "xfer %p#%u: bad segment\n", xfer, seg_idx);
+ if (edc_inc(&wa->dti_edc, EDC_MAX_ERRORS, EDC_ERROR_TIMEFRAME)) {
+ dev_err(dev, "DTI: URB max acceptable errors "
+ "exceeded, resetting device\n");
+ wa_reset_all(wa);
+ }
+ d_fnend(3, dev, "(wa %p xfer %p) = void [bad seg]\n", wa, xfer);
+ return;
+
+
+segment_aborted:
+ /* nothing to do, as the aborter did the completion */
+ spin_unlock_irqrestore(&xfer->lock, flags);
+ d_fnend(3, dev, "(wa %p xfer %p) = void [segment aborted]\n",
+ wa, xfer);
+ return;
+
+}
+
+/*
+ * Callback for the IN data phase
+ *
+ * If succesful transition state; otherwise, take a note of the
+ * error, mark this segment done and try completion.
+ *
+ * Note we don't access until we are sure that the transfer hasn't
+ * been cancelled (ECONNRESET, ENOENT), which could mean that
+ * seg->xfer could be already gone.
+ */
+static void wa_buf_in_cb(struct urb *urb)
+{
+ struct wa_seg *seg = urb->context;
+ struct wa_xfer *xfer = seg->xfer;
+ struct wahc *wa;
+ struct device *dev;
+ struct wa_rpipe *rpipe;
+ unsigned rpipe_ready;
+ unsigned long flags;
+ u8 done = 0;
+
+ d_fnstart(3, NULL, "(urb %p [%d])\n", urb, urb->status);
+ switch (urb->status) {
+ case 0:
+ spin_lock_irqsave(&xfer->lock, flags);
+ wa = xfer->wa;
+ dev = &wa->usb_iface->dev;
+ rpipe = xfer->ep->hcpriv;
+ d_printf(2, dev, "xfer %p#%u: data in done (%zu bytes)\n",
+ xfer, seg->index, (size_t)urb->actual_length);
+ seg->status = WA_SEG_DONE;
+ seg->result = urb->actual_length;
+ xfer->segs_done++;
+ rpipe_ready = rpipe_avail_inc(rpipe);
+ done = __wa_xfer_is_done(xfer);
+ spin_unlock_irqrestore(&xfer->lock, flags);
+ if (done)
+ wa_xfer_completion(xfer);
+ if (rpipe_ready)
+ wa_xfer_delayed_run(rpipe);
+ break;
+ case -ECONNRESET: /* URB unlinked; no need to do anything */
+ case -ENOENT: /* as it was done by the who unlinked us */
+ break;
+ default: /* Other errors ... */
+ spin_lock_irqsave(&xfer->lock, flags);
+ wa = xfer->wa;
+ dev = &wa->usb_iface->dev;
+ rpipe = xfer->ep->hcpriv;
+ if (printk_ratelimit())
+ dev_err(dev, "xfer %p#%u: data in error %d\n",
+ xfer, seg->index, urb->status);
+ if (edc_inc(&wa->nep_edc, EDC_MAX_ERRORS,
+ EDC_ERROR_TIMEFRAME)){
+ dev_err(dev, "DTO: URB max acceptable errors "
+ "exceeded, resetting device\n");
+ wa_reset_all(wa);
+ }
+ seg->status = WA_SEG_ERROR;
+ seg->result = urb->status;
+ xfer->segs_done++;
+ rpipe_ready = rpipe_avail_inc(rpipe);
+ __wa_xfer_abort(xfer);
+ done = __wa_xfer_is_done(xfer);
+ spin_unlock_irqrestore(&xfer->lock, flags);
+ if (done)
+ wa_xfer_completion(xfer);
+ if (rpipe_ready)
+ wa_xfer_delayed_run(rpipe);
+ }
+ d_fnend(3, NULL, "(urb %p [%d]) = void\n", urb, urb->status);
+}
+
+/*
+ * Handle an incoming transfer result buffer
+ *
+ * Given a transfer result buffer, it completes the transfer (possibly
+ * scheduling and buffer in read) and then resubmits the DTI URB for a
+ * new transfer result read.
+ *
+ *
+ * The xfer_result DTI URB state machine
+ *
+ * States: OFF | RXR (Read-Xfer-Result) | RBI (Read-Buffer-In)
+ *
+ * We start in OFF mode, the first xfer_result notification [through
+ * wa_handle_notif_xfer()] moves us to RXR by posting the DTI-URB to
+ * read.
+ *
+ * We receive a buffer -- if it is not a xfer_result, we complain and
+ * repost the DTI-URB. If it is a xfer_result then do the xfer seg
+ * request accounting. If it is an IN segment, we move to RBI and post
+ * a BUF-IN-URB to the right buffer. The BUF-IN-URB callback will
+ * repost the DTI-URB and move to RXR state. if there was no IN
+ * segment, it will repost the DTI-URB.
+ *
+ * We go back to OFF when we detect a ENOENT or ESHUTDOWN (or too many
+ * errors) in the URBs.
+ */
+static void wa_xfer_result_cb(struct urb *urb)
+{
+ int result;
+ struct wahc *wa = urb->context;
+ struct device *dev = &wa->usb_iface->dev;
+ struct wa_xfer_result *xfer_result;
+ u32 xfer_id;
+ struct wa_xfer *xfer;
+ u8 usb_status;
+
+ d_fnstart(3, dev, "(%p)\n", wa);
+ BUG_ON(wa->dti_urb != urb);
+ switch (wa->dti_urb->status) {
+ case 0:
+ /* We have a xfer result buffer; check it */
+ d_printf(2, dev, "DTI: xfer result %d bytes at %p\n",
+ urb->actual_length, urb->transfer_buffer);
+ d_dump(3, dev, urb->transfer_buffer, urb->actual_length);
+ if (wa->dti_urb->actual_length != sizeof(*xfer_result)) {
+ dev_err(dev, "DTI Error: xfer result--bad size "
+ "xfer result (%d bytes vs %zu needed)\n",
+ urb->actual_length, sizeof(*xfer_result));
+ break;
+ }
+ xfer_result = wa->xfer_result;
+ if (xfer_result->hdr.bLength != sizeof(*xfer_result)) {
+ dev_err(dev, "DTI Error: xfer result--"
+ "bad header length %u\n",
+ xfer_result->hdr.bLength);
+ break;
+ }
+ if (xfer_result->hdr.bNotifyType != WA_XFER_RESULT) {
+ dev_err(dev, "DTI Error: xfer result--"
+ "bad header type 0x%02x\n",
+ xfer_result->hdr.bNotifyType);
+ break;
+ }
+ usb_status = xfer_result->bTransferStatus & 0x3f;
+ if (usb_status == WA_XFER_STATUS_ABORTED
+ || usb_status == WA_XFER_STATUS_NOT_FOUND)
+ /* taken care of already */
+ break;
+ xfer_id = xfer_result->dwTransferID;
+ xfer = wa_xfer_get_by_id(wa, xfer_id);
+ if (xfer == NULL) {
+ /* FIXME: transaction might have been cancelled */
+ dev_err(dev, "DTI Error: xfer result--"
+ "unknown xfer 0x%08x (status 0x%02x)\n",
+ xfer_id, usb_status);
+ break;
+ }
+ wa_xfer_result_chew(wa, xfer);
+ wa_xfer_put(xfer);
+ break;
+ case -ENOENT: /* (we killed the URB)...so, no broadcast */
+ case -ESHUTDOWN: /* going away! */
+ dev_dbg(dev, "DTI: going down! %d\n", urb->status);
+ goto out;
+ default:
+ /* Unknown error */
+ if (edc_inc(&wa->dti_edc, EDC_MAX_ERRORS,
+ EDC_ERROR_TIMEFRAME)) {
+ dev_err(dev, "DTI: URB max acceptable errors "
+ "exceeded, resetting device\n");
+ wa_reset_all(wa);
+ goto out;
+ }
+ if (printk_ratelimit())
+ dev_err(dev, "DTI: URB error %d\n", urb->status);
+ break;
+ }
+ /* Resubmit the DTI URB */
+ result = usb_submit_urb(wa->dti_urb, GFP_ATOMIC);
+ if (result < 0) {
+ dev_err(dev, "DTI Error: Could not submit DTI URB (%d), "
+ "resetting\n", result);
+ wa_reset_all(wa);
+ }
+out:
+ d_fnend(3, dev, "(%p) = void\n", wa);
+ return;
+}
+
+/*
+ * Transfer complete notification
+ *
+ * Called from the notif.c code. We get a notification on EP2 saying
+ * that some endpoint has some transfer result data available. We are
+ * about to read it.
+ *
+ * To speed up things, we always have a URB reading the DTI URB; we
+ * don't really set it up and start it until the first xfer complete
+ * notification arrives, which is what we do here.
+ *
+ * Follow up in wa_xfer_result_cb(), as that's where the whole state
+ * machine starts.
+ *
+ * So here we just initialize the DTI URB for reading transfer result
+ * notifications and also the buffer-in URB, for reading buffers. Then
+ * we just submit the DTI URB.
+ *
+ * @wa shall be referenced
+ */
+void wa_handle_notif_xfer(struct wahc *wa, struct wa_notif_hdr *notif_hdr)
+{
+ int result;
+ struct device *dev = &wa->usb_iface->dev;
+ struct wa_notif_xfer *notif_xfer;
+ const struct usb_endpoint_descriptor *dti_epd = wa->dti_epd;
+
+ d_fnstart(4, dev, "(%p, %p)\n", wa, notif_hdr);
+ notif_xfer = container_of(notif_hdr, struct wa_notif_xfer, hdr);
+ BUG_ON(notif_hdr->bNotifyType != WA_NOTIF_TRANSFER);
+
+ if ((0x80 | notif_xfer->bEndpoint) != dti_epd->bEndpointAddress) {
+ /* FIXME: hardcoded limitation, adapt */
+ dev_err(dev, "BUG: DTI ep is %u, not %u (hack me)\n",
+ notif_xfer->bEndpoint, dti_epd->bEndpointAddress);
+ goto error;
+ }
+ if (wa->dti_urb != NULL) /* DTI URB already started */
+ goto out;
+
+ wa->dti_urb = usb_alloc_urb(0, GFP_KERNEL);
+ if (wa->dti_urb == NULL) {
+ dev_err(dev, "Can't allocate DTI URB\n");
+ goto error_dti_urb_alloc;
+ }
+ usb_fill_bulk_urb(
+ wa->dti_urb, wa->usb_dev,
+ usb_rcvbulkpipe(wa->usb_dev, 0x80 | notif_xfer->bEndpoint),
+ wa->xfer_result, wa->xfer_result_size,
+ wa_xfer_result_cb, wa);
+
+ wa->buf_in_urb = usb_alloc_urb(0, GFP_KERNEL);
+ if (wa->buf_in_urb == NULL) {
+ dev_err(dev, "Can't allocate BUF-IN URB\n");
+ goto error_buf_in_urb_alloc;
+ }
+ usb_fill_bulk_urb(
+ wa->buf_in_urb, wa->usb_dev,
+ usb_rcvbulkpipe(wa->usb_dev, 0x80 | notif_xfer->bEndpoint),
+ NULL, 0, wa_buf_in_cb, wa);
+ result = usb_submit_urb(wa->dti_urb, GFP_KERNEL);
+ if (result < 0) {
+ dev_err(dev, "DTI Error: Could not submit DTI URB (%d), "
+ "resetting\n", result);
+ goto error_dti_urb_submit;
+ }
+out:
+ d_fnend(4, dev, "(%p, %p) = void\n", wa, notif_hdr);
+ return;
+
+error_dti_urb_submit:
+ usb_put_urb(wa->buf_in_urb);
+error_buf_in_urb_alloc:
+ usb_put_urb(wa->dti_urb);
+ wa->dti_urb = NULL;
+error_dti_urb_alloc:
+error:
+ wa_reset_all(wa);
+ d_fnend(4, dev, "(%p, %p) = void\n", wa, notif_hdr);
+ return;
+}