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>

1 files changed, 8 insertions, 18 deletions

diff --git a/drivers/uwb/beacon.c b/drivers/uwb/beacon.c
index d9f2a8acc593..247956098afa 100644
--- a/drivers/uwb/beacon.c
+++ b/drivers/uwb/beacon.c
@@ -119,7 +119,6 @@ int uwb_rc_beacon(struct uwb_rc *rc, int channel, unsigned bpst_offset)
         int result;
         struct device *dev = &rc->uwb_dev.dev;
 
-        mutex_lock(&rc->uwb_dev.mutex);
         if (channel < 0)
                 channel = -1;
         if (channel == -1)
@@ -128,7 +127,7 @@ int uwb_rc_beacon(struct uwb_rc *rc, int channel, unsigned bpst_offset)
                 /* channel >= 0...dah */
                 result = uwb_rc_start_beacon(rc, bpst_offset, channel);
                 if (result < 0)
-                        goto out_up;
+                        return result;
                 if (le16_to_cpu(rc->ies->wIELength) > 0) {
                         result = uwb_rc_set_ie(rc, rc->ies);
                         if (result < 0) {
@@ -137,19 +136,14 @@ int uwb_rc_beacon(struct uwb_rc *rc, int channel, unsigned bpst_offset)
                                 result = uwb_rc_stop_beacon(rc);
                                 channel = -1;
                                 bpst_offset = 0;
-                        } else
-                                result = 0;
+                        }
                 }
         }
 
-        if (result < 0)
-                goto out_up;
-        rc->beaconing = channel;
-
-        uwb_notify(rc, NULL, uwb_bg_joined(rc) ? UWB_NOTIF_BG_JOIN : UWB_NOTIF_BG_LEAVE);
-
-out_up:
-        mutex_unlock(&rc->uwb_dev.mutex);
+        if (result >= 0) {
+                rc->beaconing = channel;
+                uwb_notify(rc, NULL, uwb_bg_joined(rc) ? UWB_NOTIF_BG_JOIN : UWB_NOTIF_BG_LEAVE);
+        }
         return result;
 }
 
@@ -618,9 +612,6 @@ static ssize_t uwb_rc_beacon_show(struct device *dev,
 
 /*
  * Start beaconing on the specified channel, or stop beaconing.
- *
- * The BPST offset of when to start searching for a beacon group to
- * join may be specified.
  */
 static ssize_t uwb_rc_beacon_store(struct device *dev,
                                    struct device_attribute *attr,
@@ -629,12 +620,11 @@ static ssize_t uwb_rc_beacon_store(struct device *dev,
         struct uwb_dev *uwb_dev = to_uwb_dev(dev);
         struct uwb_rc *rc = uwb_dev->rc;
         int channel;
-        unsigned bpst_offset = 0;
         ssize_t result = -EINVAL;
 
-        result = sscanf(buf, "%d %u\n", &channel, &bpst_offset);
+        result = sscanf(buf, "%d", &channel);
         if (result >= 1)
-                result = uwb_rc_beacon(rc, channel, bpst_offset);
+                result = uwb_radio_force_channel(rc, channel);
 
         return result < 0 ? result : size;
 }