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, 19 insertions, 4 deletions

diff --git a/include/linux/uwb.h b/include/linux/uwb.h
index effd97998fd1..7d3ebf046f9a 100644
--- a/include/linux/uwb.h
+++ b/include/linux/uwb.h
@@ -355,6 +355,7 @@ struct uwb_rc {
         u8 ctx_roll;
 
         int beaconing;                  /* Beaconing state [channel number] */
+        int beaconing_forced;
         int scanning;
         enum uwb_scan_type scan_type:3;
         unsigned ready:1;
@@ -373,8 +374,8 @@ struct uwb_rc {
         struct uwb_rc_cmd_set_ie *ies;
         size_t ies_capacity;
 
-        spinlock_t pal_lock;
         struct list_head pals;
+        int active_pals;
 
         struct uwb_dbg *dbg;
 };
@@ -382,11 +383,17 @@ struct uwb_rc {
 
 /**
  * struct uwb_pal - a UWB PAL
- * @name:    descriptive name for this PAL (wushc, wlp, etc.).
+ * @name:    descriptive name for this PAL (wusbhc, wlp, etc.).
  * @device:  a device for the PAL.  Used to link the PAL and the radio
  *           controller in sysfs.
+ * @rc:      the radio controller the PAL uses.
+ * @channel_changed: called when the channel used by the radio changes.
+ *           A channel of -1 means the channel has been stopped.
  * @new_rsv: called when a peer requests a reservation (may be NULL if
  *           the PAL cannot accept reservation requests).
+ * @channel: channel being used by the PAL; 0 if the PAL isn't using
+ *           the radio; -1 if the PAL wishes to use the radio but
+ *           cannot.
  *
  * A Protocol Adaptation Layer (PAL) is a user of the WiMedia UWB
  * radio platform (e.g., WUSB, WLP or Bluetooth UWB AMP).
@@ -405,12 +412,20 @@ struct uwb_pal {
         struct list_head node;
         const char *name;
         struct device *device;
+        struct uwb_rc *rc;
+
+        void (*channel_changed)(struct uwb_pal *pal, int channel);
         void (*new_rsv)(struct uwb_pal *pal, struct uwb_rsv *rsv);
+
+        int channel;
 };
 
 void uwb_pal_init(struct uwb_pal *pal);
-int uwb_pal_register(struct uwb_rc *rc, struct uwb_pal *pal);
-void uwb_pal_unregister(struct uwb_rc *rc, struct uwb_pal *pal);
+int uwb_pal_register(struct uwb_pal *pal);
+void uwb_pal_unregister(struct uwb_pal *pal);
+
+int uwb_radio_start(struct uwb_pal *pal);
+void uwb_radio_stop(struct uwb_pal *pal);
 
 /*
  * General public API