iwlwifi: debugFs to enable/disable HT40 support

[uclinux-h8/linux.git] / drivers / net / wireless / iwlwifi / iwl-debugfs.c

diff --git a/drivers/net/wireless/iwlwifi/iwl-debugfs.c b/drivers/net/wireless/iwlwifi/iwl-debugfs.c
index 748dc31..7707a26 100644 (file)
--- a/drivers/net/wireless/iwlwifi/iwl-debugfs.c
+++ b/drivers/net/wireless/iwlwifi/iwl-debugfs.c
@@ -653,6 +653,49 @@ static ssize_t iwl_dbgfs_thermal_throttling_read(struct file *file,
        return ret;
 }
 
+static ssize_t iwl_dbgfs_disable_ht40_write(struct file *file,
+                                        const char __user *user_buf,
+                                        size_t count, loff_t *ppos)
+{
+       struct iwl_priv *priv = file->private_data;
+       char buf[8];
+       int buf_size;
+       int ht40;
+
+       memset(buf, 0, sizeof(buf));
+       buf_size = min(count, sizeof(buf) -  1);
+       if (copy_from_user(buf, user_buf, buf_size))
+               return -EFAULT;
+       if (sscanf(buf, "%d", &ht40) != 1)
+               return -EFAULT;
+       if (!iwl_is_associated(priv))
+               priv->disable_ht40 = ht40 ? true : false;
+       else {
+               IWL_ERR(priv, "Sta associated with AP - "
+                       "Change to 40MHz channel support is not allowed\n");
+               return -EINVAL;
+       }
+
+       return count;
+}
+
+static ssize_t iwl_dbgfs_disable_ht40_read(struct file *file,
+                                        char __user *user_buf,
+                                        size_t count, loff_t *ppos)
+{
+       struct iwl_priv *priv = (struct iwl_priv *)file->private_data;
+       char buf[100];
+       int pos = 0;
+       const size_t bufsz = sizeof(buf);
+       ssize_t ret;
+
+       pos += scnprintf(buf + pos, bufsz - pos,
+                       "11n 40MHz Mode: %s\n",
+                       priv->disable_ht40 ? "Disabled" : "Enabled");
+       ret = simple_read_from_buffer(user_buf, count, ppos, buf, pos);
+       return ret;
+}
+
 DEBUGFS_READ_WRITE_FILE_OPS(sram);
 DEBUGFS_WRITE_FILE_OPS(log_event);
 DEBUGFS_READ_FILE_OPS(nvm);
@@ -667,6 +710,7 @@ DEBUGFS_READ_FILE_OPS(qos);
 DEBUGFS_READ_FILE_OPS(led);
 #endif
 DEBUGFS_READ_FILE_OPS(thermal_throttling);
+DEBUGFS_READ_WRITE_FILE_OPS(disable_ht40);
 
 /*
  * Create the debugfs files and directories
@@ -708,6 +752,7 @@ int iwl_dbgfs_register(struct iwl_priv *priv, const char *name)
        DEBUGFS_ADD_FILE(led, data);
 #endif
        DEBUGFS_ADD_FILE(thermal_throttling, data);
+       DEBUGFS_ADD_FILE(disable_ht40, data);
        DEBUGFS_ADD_BOOL(disable_sensitivity, rf, &priv->disable_sens_cal);
        DEBUGFS_ADD_BOOL(disable_chain_noise, rf,
                         &priv->disable_chain_noise_cal);
@@ -747,6 +792,7 @@ void iwl_dbgfs_unregister(struct iwl_priv *priv)
        DEBUGFS_REMOVE(priv->dbgfs->dbgfs_data_files.file_led);
 #endif
        DEBUGFS_REMOVE(priv->dbgfs->dbgfs_data_files.file_thermal_throttling);
+       DEBUGFS_REMOVE(priv->dbgfs->dbgfs_data_files.file_disable_ht40);
        DEBUGFS_REMOVE(priv->dbgfs->dir_data);
        DEBUGFS_REMOVE(priv->dbgfs->dbgfs_rf_files.file_disable_sensitivity);
        DEBUGFS_REMOVE(priv->dbgfs->dbgfs_rf_files.file_disable_chain_noise);