1 files changed, 115 insertions, 0 deletions

diff --git a/drivers/usb/wusbcore/reservation.c b/drivers/usb/wusbcore/reservation.c
new file mode 100644
index 00000000000..fc63e77ded2
--- /dev/null
+++ b/drivers/usb/wusbcore/reservation.c
@@ -0,0 +1,115 @@
+/*
+ * WUSB cluster reservation management
+ *
+ * Copyright (C) 2007 Cambridge Silicon Radio Ltd.
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+#include <linux/kernel.h>
+#include <linux/uwb.h>
+
+#include "wusbhc.h"
+
+/*
+ * WUSB cluster reservations are multicast reservations with the
+ * broadcast cluster ID (BCID) as the target DevAddr.
+ *
+ * FIXME: consider adjusting the reservation depending on what devices
+ * are attached.
+ */
+
+static int wusbhc_bwa_set(struct wusbhc *wusbhc, u8 stream,
+        const struct uwb_mas_bm *mas)
+{
+        if (mas == NULL)
+                mas = &uwb_mas_bm_zero;
+        return wusbhc->bwa_set(wusbhc, stream, mas);
+}
+
+/**
+ * wusbhc_rsv_complete_cb - WUSB HC reservation complete callback
+ * @rsv:    the reservation
+ *
+ * Either set or clear the HC's view of the reservation.
+ *
+ * FIXME: when a reservation is denied the HC should be stopped.
+ */
+static void wusbhc_rsv_complete_cb(struct uwb_rsv *rsv)
+{
+        struct wusbhc *wusbhc = rsv->pal_priv;
+        struct device *dev = wusbhc->dev;
+        char buf[72];
+
+        switch (rsv->state) {
+        case UWB_RSV_STATE_O_ESTABLISHED:
+                bitmap_scnprintf(buf, sizeof(buf), rsv->mas.bm, UWB_NUM_MAS);
+                dev_dbg(dev, "established reservation: %s\n", buf);
+                wusbhc_bwa_set(wusbhc, rsv->stream, &rsv->mas);
+                break;
+        case UWB_RSV_STATE_NONE:
+                dev_dbg(dev, "removed reservation\n");
+                wusbhc_bwa_set(wusbhc, 0, NULL);
+                wusbhc->rsv = NULL;
+                break;
+        default:
+                dev_dbg(dev, "unexpected reservation state: %d\n", rsv->state);
+                break;
+        }
+}
+
+
+/**
+ * wusbhc_rsv_establish - establish a reservation for the cluster
+ * @wusbhc: the WUSB HC requesting a bandwith reservation
+ */
+int wusbhc_rsv_establish(struct wusbhc *wusbhc)
+{
+        struct uwb_rc *rc = wusbhc->uwb_rc;
+        struct uwb_rsv *rsv;
+        struct uwb_dev_addr bcid;
+        int ret;
+
+        rsv = uwb_rsv_create(rc, wusbhc_rsv_complete_cb, wusbhc);
+        if (rsv == NULL)
+                return -ENOMEM;
+
+        bcid.data[0] = wusbhc->cluster_id;
+        bcid.data[1] = 0;
+
+        rsv->owner = &rc->uwb_dev;
+        rsv->target.type = UWB_RSV_TARGET_DEVADDR;
+        rsv->target.devaddr = bcid;
+        rsv->type = UWB_DRP_TYPE_PRIVATE;
+        rsv->max_mas = 256;
+        rsv->min_mas = 16;  /* one MAS per zone? */
+        rsv->sparsity = 16; /* at least one MAS in each zone? */
+        rsv->is_multicast = true;
+
+        ret = uwb_rsv_establish(rsv);
+        if (ret == 0)
+                wusbhc->rsv = rsv;
+        else
+                uwb_rsv_destroy(rsv);
+        return ret;
+}
+
+
+/**
+ * wusbhc_rsv_terminate - terminate any cluster reservation
+ * @wusbhc: the WUSB host whose reservation is to be terminated
+ */
+void wusbhc_rsv_terminate(struct wusbhc *wusbhc)
+{
+        if (wusbhc->rsv)
+                uwb_rsv_terminate(wusbhc->rsv);
+}