ath9k: Add "debug" file to debugfs

This patch adds the debug file to the ath9k debugfs, which lets you modify
the debug_mask at runtime, without having to reload the ath9k module.

Signed-off-by: Jeff Hansen <x@jeffhansen.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 38 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath9k/debug.c b/drivers/net/wireless/ath/ath9k/debug.c
index 80115ea07c7d..a42d631e7456 100644
--- a/drivers/net/wireless/ath/ath9k/debug.c
+++ b/drivers/net/wireless/ath/ath9k/debug.c
@@ -44,6 +44,38 @@ static int ath9k_debugfs_open(struct inode *inode, struct file *file)
         return 0;
 }
 
+static ssize_t read_file_debug(struct file *file, char __user *user_buf,
+                             size_t count, loff_t *ppos)
+{
+        struct ath_softc *sc = file->private_data;
+        char buf[32];
+        unsigned int len = 0;
+        len += snprintf(buf, sizeof(buf), "0x%08x\n", sc->debug.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 ath_softc *sc = file->private_data;
+        unsigned long mask;
+        char buf[32];
+        if (copy_from_user(buf, user_buf, (sizeof(buf) - 1) < count ?
+                (sizeof(buf) - 1) : count))
+                return 0;
+        buf[sizeof(buf)-1] = 0;
+        if (strict_strtoul(buf, 0, &mask) == 0)
+                sc->debug.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
+};
+
 static ssize_t read_file_dma(struct file *file, char __user *user_buf,
                              size_t count, loff_t *ppos)
 {
@@ -461,6 +493,11 @@ int ath9k_init_debug(struct ath_softc *sc)
         if (!sc->debug.debugfs_phy)
                 goto err;
 
+        sc->debug.debugfs_debug = debugfs_create_file("debug",
+                S_IRUGO | S_IWUSR, sc->debug.debugfs_phy, sc, &fops_debug);
+        if (!sc->debug.debugfs_debug)
+                goto err;
+
         sc->debug.debugfs_dma = debugfs_create_file("dma", S_IRUGO,
                                        sc->debug.debugfs_phy, sc, &fops_dma);
         if (!sc->debug.debugfs_dma)
@@ -498,6 +535,7 @@ void ath9k_exit_debug(struct ath_softc *sc)
         debugfs_remove(sc->debug.debugfs_rcstat);
         debugfs_remove(sc->debug.debugfs_interrupt);
         debugfs_remove(sc->debug.debugfs_dma);
+        debugfs_remove(sc->debug.debugfs_debug);
         debugfs_remove(sc->debug.debugfs_phy);
 }