ath6kl: Add debugfs entry to modify roaming parameters.

Firmware initiates roaming only after it reaches a rssi of 20.
This lower rssi threshold can be modified through a wmi command
to modify the roaming behavior.

kvalo: rename debugfs functions and move comment about rssi units next to
ath6kl_wmi_set_roam_lrssi_cmd()

Signed-off-by: Vivek Natarajan <nataraja@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>

1 files changed, 29 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath6kl/wmi.c b/drivers/net/wireless/ath/ath6kl/wmi.c
index 7201a72ac1b8..c9ec6303db72 100644
--- a/drivers/net/wireless/ath/ath6kl/wmi.c
+++ b/drivers/net/wireless/ath/ath6kl/wmi.c
@@ -666,6 +666,35 @@ static int ath6kl_wmi_ready_event_rx(struct wmi *wmi, u8 *datap, int len)
 	return 0;
 }
 
+/*
+ * Mechanism to modify the roaming behavior in the firmware. The lower rssi
+ * at which the station has to roam can be passed with
+ * WMI_SET_LRSSI_SCAN_PARAMS. Subtract 96 from RSSI to get the signal level
+ * in dBm.
+ */
+int ath6kl_wmi_set_roam_lrssi_cmd(struct wmi *wmi, u8 lrssi)
+{
+	struct sk_buff *skb;
+	struct roam_ctrl_cmd *cmd;
+
+	skb = ath6kl_wmi_get_new_buf(sizeof(*cmd));
+	if (!skb)
+		return -ENOMEM;
+
+	cmd = (struct roam_ctrl_cmd *) skb->data;
+
+	cmd->info.params.lrssi_scan_period = cpu_to_le16(DEF_LRSSI_SCAN_PERIOD);
+	cmd->info.params.lrssi_scan_threshold = a_cpu_to_sle16(lrssi +
+						       DEF_SCAN_FOR_ROAM_INTVL);
+	cmd->info.params.lrssi_roam_threshold = a_cpu_to_sle16(lrssi);
+	cmd->info.params.roam_rssi_floor = DEF_LRSSI_ROAM_FLOOR;
+	cmd->roam_ctrl = WMI_SET_LRSSI_SCAN_PARAMS;
+
+	ath6kl_wmi_cmd_send(wmi, skb, WMI_SET_ROAM_CTRL_CMDID, NO_SYNC_WMIFLAG);
+
+	return 0;
+}
+
 static int ath6kl_wmi_connect_event_rx(struct wmi *wmi, u8 *datap, int len)
 {
 	struct wmi_connect_event *ev;