ath9k: Add a HW capability for WLAN/BT RX diversity

Make use of this capability to restrict the usage of the
debugfs file and modparam using which this feature can
be enabled.

Signed-off-by: Sujith Manoharan <c_manoha@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/net/wireless/ath/ath9k/debug.c b/drivers/net/wireless/ath/ath9k/debug.c
index 881ca6cb47db..daa316bf47b3 100644
--- a/drivers/net/wireless/ath/ath9k/debug.c
+++ b/drivers/net/wireless/ath/ath9k/debug.c
@@ -289,6 +289,7 @@ static ssize_t write_file_bt_ant_diversity(struct file *file,
 {
         struct ath_softc *sc = file->private_data;
         struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+        struct ath9k_hw_capabilities *pCap = &sc->sc_ah->caps;
         unsigned long bt_ant_diversity;
         char buf[32];
         ssize_t len;
@@ -297,6 +298,9 @@ static ssize_t write_file_bt_ant_diversity(struct file *file,
         if (copy_from_user(buf, user_buf, len))
                 return -EFAULT;
 
+        if (!(pCap->hw_caps & ATH9K_HW_CAP_BT_ANT_DIV))
+                goto exit;
+
         buf[len] = '\0';
         if (kstrtoul(buf, 0, &bt_ant_diversity))
                 return -EINVAL;
@@ -307,7 +311,7 @@ static ssize_t write_file_bt_ant_diversity(struct file *file,
         ath_dbg(common, CONFIG, "Enable WLAN/BT RX Antenna diversity: %d\n",
                 common->bt_ant_diversity);
         ath9k_ps_restore(sc);
-
+exit:
         return count;
 }