ath9k: Add a debugfs file to adjust antenna diversity

Location: /<debugfs>/ieee80211/phy#/ath9k/diversity

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

1 files changed, 53 insertions, 2 deletions

diff --git a/drivers/net/wireless/ath/ath9k/debug.c b/drivers/net/wireless/ath/ath9k/debug.c
index ab3bc85a1f8..ed38216c3ca 100644
--- a/drivers/net/wireless/ath/ath9k/debug.c
+++ b/drivers/net/wireless/ath/ath9k/debug.c
@@ -222,6 +222,57 @@ static const struct file_operations fops_disable_ani = {
         .llseek = default_llseek,
 };
 
+static ssize_t read_file_ant_diversity(struct file *file, char __user *user_buf,
+                                       size_t count, loff_t *ppos)
+{
+        struct ath_softc *sc = file->private_data;
+        struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+        char buf[32];
+        unsigned int len;
+
+        len = sprintf(buf, "%d\n", common->antenna_diversity);
+        return simple_read_from_buffer(user_buf, count, ppos, buf, len);
+}
+
+static ssize_t write_file_ant_diversity(struct file *file,
+                                        const char __user *user_buf,
+                                        size_t count, loff_t *ppos)
+{
+        struct ath_softc *sc = file->private_data;
+        struct ath_common *common = ath9k_hw_common(sc->sc_ah);
+        unsigned long antenna_diversity;
+        char buf[32];
+        ssize_t len;
+
+        len = min(count, sizeof(buf) - 1);
+        if (copy_from_user(buf, user_buf, len))
+                return -EFAULT;
+
+        if (!AR_SREV_9565(sc->sc_ah))
+                goto exit;
+
+        buf[len] = '\0';
+        if (strict_strtoul(buf, 0, &antenna_diversity))
+                return -EINVAL;
+
+        common->antenna_diversity = !!antenna_diversity;
+        ath9k_ps_wakeup(sc);
+        ath_ant_comb_update(sc);
+        ath_dbg(common, CONFIG, "Antenna diversity: %d\n",
+                common->antenna_diversity);
+        ath9k_ps_restore(sc);
+exit:
+        return count;
+}
+
+static const struct file_operations fops_ant_diversity = {
+        .read = read_file_ant_diversity,
+        .write = write_file_ant_diversity,
+        .open = simple_open,
+        .owner = THIS_MODULE,
+        .llseek = default_llseek,
+};
+
 static ssize_t read_file_dma(struct file *file, char __user *user_buf,
                              size_t count, loff_t *ppos)
 {
@@ -1599,12 +1650,12 @@ int ath9k_init_debug(struct ath_hw *ah)
         debugfs_create_file("samples", S_IRUSR, sc->debug.debugfs_phy, sc,
                             &fops_samps);
 #endif
-
         debugfs_create_u32("gpio_mask", S_IRUSR | S_IWUSR,
                            sc->debug.debugfs_phy, &sc->sc_ah->gpio_mask);
-
         debugfs_create_u32("gpio_val", S_IRUSR | S_IWUSR,
                            sc->debug.debugfs_phy, &sc->sc_ah->gpio_val);
+        debugfs_create_file("diversity", S_IRUSR | S_IWUSR,
+                            sc->debug.debugfs_phy, sc, &fops_ant_diversity);
 
         return 0;
 }