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060b694929
Now that the SPDX tag is in all USB files, that identifies the license in a specific and legally-defined manner. So the extra GPL text wording can be removed as it is no longer needed at all. This is done on a quest to remove the 700+ different ways that files in the kernel describe the GPL license text. And there's unneeded stuff like the address (sometimes incorrect) for the FSF which is never needed. No copyright headers or other non-license-description text was removed. Cc: Felipe Balbi <felipe.balbi@linux.intel.com> Cc: Johan Hovold <johan@kernel.org> Cc: Arvind Yadav <arvind.yadav.cs@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
110 lines
2.6 KiB
C
110 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* WUSB cluster reservation management
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*
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* Copyright (C) 2007 Cambridge Silicon Radio Ltd.
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*/
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#include <linux/kernel.h>
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#include <linux/uwb.h>
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#include "wusbhc.h"
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/*
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* WUSB cluster reservations are multicast reservations with the
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* broadcast cluster ID (BCID) as the target DevAddr.
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*
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* FIXME: consider adjusting the reservation depending on what devices
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* are attached.
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*/
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static int wusbhc_bwa_set(struct wusbhc *wusbhc, u8 stream,
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const struct uwb_mas_bm *mas)
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{
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if (mas == NULL)
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mas = &uwb_mas_bm_zero;
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return wusbhc->bwa_set(wusbhc, stream, mas);
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}
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/**
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* wusbhc_rsv_complete_cb - WUSB HC reservation complete callback
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* @rsv: the reservation
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*
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* Either set or clear the HC's view of the reservation.
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*
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* FIXME: when a reservation is denied the HC should be stopped.
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*/
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static void wusbhc_rsv_complete_cb(struct uwb_rsv *rsv)
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{
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struct wusbhc *wusbhc = rsv->pal_priv;
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struct device *dev = wusbhc->dev;
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struct uwb_mas_bm mas;
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dev_dbg(dev, "%s: state = %d\n", __func__, rsv->state);
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switch (rsv->state) {
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case UWB_RSV_STATE_O_ESTABLISHED:
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uwb_rsv_get_usable_mas(rsv, &mas);
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dev_dbg(dev, "established reservation: %*pb\n",
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UWB_NUM_MAS, mas.bm);
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wusbhc_bwa_set(wusbhc, rsv->stream, &mas);
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break;
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case UWB_RSV_STATE_NONE:
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dev_dbg(dev, "removed reservation\n");
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wusbhc_bwa_set(wusbhc, 0, NULL);
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break;
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default:
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dev_dbg(dev, "unexpected reservation state: %d\n", rsv->state);
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break;
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}
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}
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/**
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* wusbhc_rsv_establish - establish a reservation for the cluster
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* @wusbhc: the WUSB HC requesting a bandwidth reservation
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*/
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int wusbhc_rsv_establish(struct wusbhc *wusbhc)
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{
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struct uwb_rc *rc = wusbhc->uwb_rc;
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struct uwb_rsv *rsv;
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struct uwb_dev_addr bcid;
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int ret;
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if (rc == NULL)
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return -ENODEV;
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rsv = uwb_rsv_create(rc, wusbhc_rsv_complete_cb, wusbhc);
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if (rsv == NULL)
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return -ENOMEM;
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bcid.data[0] = wusbhc->cluster_id;
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bcid.data[1] = 0;
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rsv->target.type = UWB_RSV_TARGET_DEVADDR;
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rsv->target.devaddr = bcid;
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rsv->type = UWB_DRP_TYPE_PRIVATE;
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rsv->max_mas = 256; /* try to get as much as possible */
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rsv->min_mas = 15; /* one MAS per zone */
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rsv->max_interval = 1; /* max latency is one zone */
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rsv->is_multicast = true;
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ret = uwb_rsv_establish(rsv);
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if (ret == 0)
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wusbhc->rsv = rsv;
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else
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uwb_rsv_destroy(rsv);
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return ret;
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}
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/**
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* wusbhc_rsv_terminate - terminate the cluster reservation
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* @wusbhc: the WUSB host whose reservation is to be terminated
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*/
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void wusbhc_rsv_terminate(struct wusbhc *wusbhc)
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{
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if (wusbhc->rsv) {
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uwb_rsv_terminate(wusbhc->rsv);
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uwb_rsv_destroy(wusbhc->rsv);
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wusbhc->rsv = NULL;
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}
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}
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