ath9k_htc: Add debugfs support to change debug mask

Signed-off-by: Rajkumar Manoharan <rmanoharan@atheros.com>
Acked-by: Sujith Manoharan <Sujith.Manoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

2 files changed, 50 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath9k/htc.h b/drivers/net/wireless/ath/ath9k/htc.h
index cc5d0a4b9da2..852cdcfbcbb6 100644
--- a/drivers/net/wireless/ath/ath9k/htc.h
+++ b/drivers/net/wireless/ath/ath9k/htc.h
@@ -366,6 +366,7 @@ struct ath9k_debug {
         struct dentry *debugfs_recv;
         struct dentry *debugfs_slot;
         struct dentry *debugfs_queue;
+        struct dentry *debugfs_debug;
         struct ath_tx_stats tx_stats;
         struct ath_rx_stats rx_stats;
 };
diff --git a/drivers/net/wireless/ath/ath9k/htc_drv_debug.c b/drivers/net/wireless/ath/ath9k/htc_drv_debug.c
index 8d0de60e0c27..7394a1b9882a 100644
--- a/drivers/net/wireless/ath/ath9k/htc_drv_debug.c
+++ b/drivers/net/wireless/ath/ath9k/htc_drv_debug.c
@@ -435,6 +435,47 @@ static const struct file_operations fops_queue = {
         .llseek = default_llseek,
 };
 
+static ssize_t read_file_debug(struct file *file, char __user *user_buf,
+                               size_t count, loff_t *ppos)
+{
+        struct ath9k_htc_priv *priv = file->private_data;
+        struct ath_common *common = ath9k_hw_common(priv->ah);
+        char buf[32];
+        unsigned int len;
+
+        len = sprintf(buf, "0x%08x\n", common->debug_mask);
+        return simple_read_from_buffer(user_buf, count, ppos, buf, len);
+}
+
+static ssize_t write_file_debug(struct file *file, const char __user *user_buf,
+                                size_t count, loff_t *ppos)
+{
+        struct ath9k_htc_priv *priv = file->private_data;
+        struct ath_common *common = ath9k_hw_common(priv->ah);
+        unsigned long mask;
+        char buf[32];
+        ssize_t len;
+
+        len = min(count, sizeof(buf) - 1);
+        if (copy_from_user(buf, user_buf, len))
+                return -EFAULT;
+
+        buf[len] = '\0';
+        if (strict_strtoul(buf, 0, &mask))
+                return -EINVAL;
+
+        common->debug_mask = mask;
+        return count;
+}
+
+static const struct file_operations fops_debug = {
+        .read = read_file_debug,
+        .write = write_file_debug,
+        .open = ath9k_debugfs_open,
+        .owner = THIS_MODULE,
+        .llseek = default_llseek,
+};
+
 int ath9k_htc_init_debug(struct ath_hw *ah)
 {
         struct ath_common *common = ath9k_hw_common(ah);
@@ -493,6 +534,13 @@ int ath9k_htc_init_debug(struct ath_hw *ah)
         if (!priv->debug.debugfs_queue)
                 goto err;
 
+        priv->debug.debugfs_debug = debugfs_create_file("debug",
+                                                        S_IRUSR | S_IWUSR,
+                                                        priv->debug.debugfs_phy,
+                                                        priv, &fops_debug);
+        if (!priv->debug.debugfs_debug)
+                goto err;
+
         return 0;
 
 err:
@@ -512,6 +560,7 @@ void ath9k_htc_exit_debug(struct ath_hw *ah)
         debugfs_remove(priv->debug.debugfs_tgt_int_stats);
         debugfs_remove(priv->debug.debugfs_tgt_tx_stats);
         debugfs_remove(priv->debug.debugfs_tgt_rx_stats);
+        debugfs_remove(priv->debug.debugfs_debug);
         debugfs_remove(priv->debug.debugfs_phy);
 }