iwlwifi: move show_qos to debugfs

This move the show_qos file from sysfs to debugfs because the "one
value per file" sysfs rule.

The file is located in
/sys/kernel/debug/ieee80211/phy0/iwlagn/data

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwlwifi/iwl-agn.c

@@ -2627,26 +2627,6 @@ static ssize_t show_power_level(struct device *d,
 static DEVICE_ATTR(power_level, S_IWUSR | S_IRUSR, show_power_level,
 		   store_power_level);
 
-static ssize_t show_qos(struct device *d,
-				struct device_attribute *attr, char *buf)
-{
-	struct iwl_priv *priv = dev_get_drvdata(d);
-	char *p = buf;
-	int   q;
-
-	for (q = 0; q < AC_NUM; q++) {
-		p += sprintf(p, "\tcw_min\tcw_max\taifsn\ttxop\n");
-		p += sprintf(p, "AC[%d]\t%u\t%u\t%u\t%u\n", q,
-			     priv->qos_data.def_qos_parm.ac[q].cw_min,
-			     priv->qos_data.def_qos_parm.ac[q].cw_max,
-			     priv->qos_data.def_qos_parm.ac[q].aifsn,
-			     priv->qos_data.def_qos_parm.ac[q].edca_txop);
-	}
-
-	return p - buf + 1;
-}
-
-static DEVICE_ATTR(qos, S_IRUGO, show_qos, NULL);
 
 static ssize_t show_statistics(struct device *d,
 			       struct device_attribute *attr, char *buf)
@@ -2747,7 +2727,6 @@ static struct attribute *iwl_sysfs_entries[] = {
 	&dev_attr_debug_level.attr,
 #endif
 	&dev_attr_version.attr,
-	&dev_attr_qos.attr,
 	NULL
 };
 

drivers/net/wireless/iwlwifi/iwl-debug.h

@@ -82,6 +82,7 @@ struct iwl_debugfs {
 		struct dentry *file_channels;
 		struct dentry *file_status;
 		struct dentry *file_interrupt;
+		struct dentry *file_qos;
 	} dbgfs_data_files;
 	struct dir_rf_files {
 		struct dentry *file_disable_sensitivity;

drivers/net/wireless/iwlwifi/iwl-debugfs.c

@@ -566,6 +566,28 @@ static ssize_t iwl_dbgfs_interrupt_write(struct file *file,
 	return count;
 }
 
+static ssize_t iwl_dbgfs_qos_read(struct file *file, char __user *user_buf,
+				       size_t count, loff_t *ppos)
+{
+	struct iwl_priv *priv = (struct iwl_priv *)file->private_data;
+	int pos = 0, i;
+	char buf[256];
+	const size_t bufsz = sizeof(buf);
+	ssize_t ret;
+
+	for (i = 0; i < AC_NUM; i++) {
+		pos += scnprintf(buf + pos, bufsz - pos,
+			"\tcw_min\tcw_max\taifsn\ttxop\n");
+		pos += scnprintf(buf + pos, bufsz - pos,
+				"AC[%d]\t%u\t%u\t%u\t%u\n", i,
+				priv->qos_data.def_qos_parm.ac[i].cw_min,
+				priv->qos_data.def_qos_parm.ac[i].cw_max,
+				priv->qos_data.def_qos_parm.ac[i].aifsn,
+				priv->qos_data.def_qos_parm.ac[i].edca_txop);
+	}
+	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);
@@ -576,6 +598,7 @@ DEBUGFS_READ_FILE_OPS(tx_statistics);
 DEBUGFS_READ_FILE_OPS(channels);
 DEBUGFS_READ_FILE_OPS(status);
 DEBUGFS_READ_WRITE_FILE_OPS(interrupt);
+DEBUGFS_READ_FILE_OPS(qos);
 
 /*
  * Create the debugfs files and directories
@@ -612,6 +635,7 @@ int iwl_dbgfs_register(struct iwl_priv *priv, const char *name)
 	DEBUGFS_ADD_FILE(channels, data);
 	DEBUGFS_ADD_FILE(status, data);
 	DEBUGFS_ADD_FILE(interrupt, data);
+	DEBUGFS_ADD_FILE(qos, data);
 	DEBUGFS_ADD_BOOL(disable_sensitivity, rf, &priv->disable_sens_cal);
 	DEBUGFS_ADD_BOOL(disable_chain_noise, rf,
 			 &priv->disable_chain_noise_cal);
@@ -646,6 +670,7 @@ void iwl_dbgfs_unregister(struct iwl_priv *priv)
 	DEBUGFS_REMOVE(priv->dbgfs->dbgfs_data_files.file_channels);
 	DEBUGFS_REMOVE(priv->dbgfs->dbgfs_data_files.file_status);
 	DEBUGFS_REMOVE(priv->dbgfs->dbgfs_data_files.file_interrupt);
+	DEBUGFS_REMOVE(priv->dbgfs->dbgfs_data_files.file_qos);
 	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);