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, 23 insertions, 3 deletions

diff --git a/drivers/uwb/uwb-debug.c b/drivers/uwb/uwb-debug.c
index 217ebaa..0e58071a 100644
--- a/drivers/uwb/uwb-debug.c
+++ b/drivers/uwb/uwb-debug.c
@@ -192,7 +192,7 @@ static ssize_t command_write(struct file *file, const char __user *buf,
 {
 	struct uwb_rc *rc = file->private_data;
 	struct uwb_dbg_cmd cmd;
-	int ret;
+	int ret = 0;
 
 	if (len != sizeof(struct uwb_dbg_cmd))
 		return -EINVAL;
@@ -213,6 +213,12 @@ static ssize_t command_write(struct file *file, const char __user *buf,
 	case UWB_DBG_CMD_IE_RM:
 		ret = cmd_ie_rm(rc, &cmd.ie_rm);
 		break;
+	case UWB_DBG_CMD_RADIO_START:
+		ret = uwb_radio_start(&rc->dbg->pal);
+		break;
+	case UWB_DBG_CMD_RADIO_STOP:
+		uwb_radio_stop(&rc->dbg->pal);
+		break;
 	default:
 		return -EINVAL;
 	}
@@ -306,6 +312,17 @@ static struct file_operations drp_avail_fops = {
 	.owner   = THIS_MODULE,
 };
 
+static void uwb_dbg_channel_changed(struct uwb_pal *pal, int channel)
+{
+	struct uwb_dbg *dbg = container_of(pal, struct uwb_dbg, pal);
+	struct device *dev = &pal->rc->uwb_dev.dev;
+
+	if (channel > 0)
+		dev_info(dev, "debug: channel %d started\n", channel);
+	else
+		dev_info(dev, "debug: channel stopped\n");
+}
+
 static void uwb_dbg_new_rsv(struct uwb_pal *pal, struct uwb_rsv *rsv)
 {
 	struct uwb_dbg *dbg = container_of(pal, struct uwb_dbg, pal);
@@ -329,8 +346,11 @@ void uwb_dbg_add_rc(struct uwb_rc *rc)
 	INIT_LIST_HEAD(&rc->dbg->rsvs);
 
 	uwb_pal_init(&rc->dbg->pal);
+	rc->dbg->pal.rc = rc;
+	rc->dbg->pal.channel_changed = uwb_dbg_channel_changed;
 	rc->dbg->pal.new_rsv = uwb_dbg_new_rsv;
-	uwb_pal_register(rc, &rc->dbg->pal);
+	uwb_pal_register(&rc->dbg->pal);
+
 	if (root_dir) {
 		rc->dbg->root_d = debugfs_create_dir(dev_name(&rc->uwb_dev.dev),
 						     root_dir);
@@ -364,7 +384,7 @@ void uwb_dbg_del_rc(struct uwb_rc *rc)
 		uwb_rsv_terminate(rsv);
 	}
 
-	uwb_pal_unregister(rc, &rc->dbg->pal);
+	uwb_pal_unregister(&rc->dbg->pal);
 
 	if (root_dir) {
 		debugfs_remove(rc->dbg->drp_avail_f);