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authorDavid Vrabel <david.vrabel@csr.com>2008-11-17 15:53:42 +0000
committerDavid Vrabel <david.vrabel@csr.com>2008-11-19 14:46:33 +0000
commit6fae35f9cea92793a98b2d9ab21235e5ae035581 (patch)
tree82142169ff2ccada8c6c98beb6da59cafe8d913d /drivers/usb/wusbcore/mmc.c
parente17be2b2a95b43fe0d5878adf330701bb7a77115 (diff)
uwb: add basic radio manager
The UWB radio manager coordinates the use of the radio between the PALs that may be using it. PALs request use of the radio with uwb_radio_start() and the radio manager will start beaconing if its not already doing so. When the last PAL has called uwb_radio_stop() beaconing will be stopped. In the future, the radio manager will have a more sophisticated channel selection algorithm, probably following the Channel Selection Policy from the WiMedia Alliance when it is finalized. For now, channel 9 (BG1, TFC1) is selected. The user may override the channel selected by the radio manager and may force the radio to stop beaconing. The WUSB Host Controller PAL makes use of this and there are two new debug PAL commands that can be used for testing. Signed-off-by: David Vrabel <david.vrabel@csr.com>
Diffstat (limited to 'drivers/usb/wusbcore/mmc.c')
-rw-r--r--drivers/usb/wusbcore/mmc.c75
1 files changed, 13 insertions, 62 deletions
diff --git a/drivers/usb/wusbcore/mmc.c b/drivers/usb/wusbcore/mmc.c
index af2aee0fdff..5463ecebafd 100644
--- a/drivers/usb/wusbcore/mmc.c
+++ b/drivers/usb/wusbcore/mmc.c
@@ -162,12 +162,11 @@ EXPORT_SYMBOL_GPL(wusbhc_mmcie_rm);
/*
* wusbhc_start - start transmitting MMCs and accepting connections
* @wusbhc: the HC to start
- * @chid: the CHID to use for this host
*
* Establishes a cluster reservation, enables device connections, and
* starts MMCs with appropriate DNTS parameters.
*/
-int wusbhc_start(struct wusbhc *wusbhc, const struct wusb_ckhdid *chid)
+int wusbhc_start(struct wusbhc *wusbhc)
{
int result;
struct device *dev = wusbhc->dev;
@@ -181,7 +180,7 @@ int wusbhc_start(struct wusbhc *wusbhc, const struct wusb_ckhdid *chid)
goto error_rsv_establish;
}
- result = wusbhc_devconnect_start(wusbhc, chid);
+ result = wusbhc_devconnect_start(wusbhc);
if (result < 0) {
dev_err(dev, "error enabling device connections: %d\n", result);
goto error_devconnect_start;
@@ -219,34 +218,6 @@ error_rsv_establish:
}
/*
- * Disconnect all from the WUSB Channel
- *
- * Send a Host Disconnect IE in the MMC, wait, don't send it any more
- */
-static int __wusbhc_host_disconnect_ie(struct wusbhc *wusbhc)
-{
- int result = -ENOMEM;
- struct wuie_host_disconnect *host_disconnect_ie;
- might_sleep();
- host_disconnect_ie = kmalloc(sizeof(*host_disconnect_ie), GFP_KERNEL);
- if (host_disconnect_ie == NULL)
- goto error_alloc;
- host_disconnect_ie->hdr.bLength = sizeof(*host_disconnect_ie);
- host_disconnect_ie->hdr.bIEIdentifier = WUIE_ID_HOST_DISCONNECT;
- result = wusbhc_mmcie_set(wusbhc, 0, 0, &host_disconnect_ie->hdr);
- if (result < 0)
- goto error_mmcie_set;
-
- /* WUSB1.0[8.5.3.1 & 7.5.2] */
- msleep(100);
- wusbhc_mmcie_rm(wusbhc, &host_disconnect_ie->hdr);
-error_mmcie_set:
- kfree(host_disconnect_ie);
-error_alloc:
- return result;
-}
-
-/*
* wusbhc_stop - stop transmitting MMCs
* @wusbhc: the HC to stop
*
@@ -265,29 +236,6 @@ void wusbhc_stop(struct wusbhc *wusbhc)
EXPORT_SYMBOL_GPL(wusbhc_stop);
/*
- * Change the CHID in a WUSB Channel
- *
- * If it is just a new CHID, send a Host Disconnect IE and then change
- * the CHID IE.
- */
-static int __wusbhc_chid_change(struct wusbhc *wusbhc,
- const struct wusb_ckhdid *chid)
-{
- int result = -ENOSYS;
- struct device *dev = wusbhc->dev;
- dev_err(dev, "%s() not implemented yet\n", __func__);
- return result;
-
- BUG_ON(wusbhc->wuie_host_info == NULL);
- __wusbhc_host_disconnect_ie(wusbhc);
- wusbhc->wuie_host_info->CHID = *chid;
- result = wusbhc_mmcie_set(wusbhc, 0, 0, &wusbhc->wuie_host_info->hdr);
- if (result < 0)
- dev_err(dev, "Can't update Host Info WUSB IE: %d\n", result);
- return result;
-}
-
-/*
* Set/reset/update a new CHID
*
* Depending on the previous state of the MMCs, start, stop or change
@@ -302,16 +250,19 @@ int wusbhc_chid_set(struct wusbhc *wusbhc, const struct wusb_ckhdid *chid)
chid = NULL;
mutex_lock(&wusbhc->mutex);
- if (wusbhc->active) {
- if (chid)
- result = __wusbhc_chid_change(wusbhc, chid);
- else
- wusbhc_stop(wusbhc);
- } else {
- if (chid)
- wusbhc_start(wusbhc, chid);
+ if (chid) {
+ if (wusbhc->active) {
+ mutex_unlock(&wusbhc->mutex);
+ return -EBUSY;
+ }
+ wusbhc->chid = *chid;
}
mutex_unlock(&wusbhc->mutex);
+
+ if (chid)
+ result = uwb_radio_start(&wusbhc->pal);
+ else
+ uwb_radio_stop(&wusbhc->pal);
return result;
}
EXPORT_SYMBOL_GPL(wusbhc_chid_set);