staging: rtl8192u: move debug files to debugfs

There are 4 debug files created under /proc/net/[Devname].
Due to this is purely for debuging as files are created read only,
move this to debugfs like other NIC drivers do instead of using procfs.
The directory structure will be like the following

  /sys/kernel/debug/r8192u_usb/wlan0/stats-rx
  /sys/kernel/debug/r8192u_usb/wlan0/stats-rx
  /sys/kernel/debug/r8192u_usb/wlan0/stats-ap
  /sys/kernel/debug/r8192u_usb/wlan0/registers

This is also to prepare for address rmmod warn issue.

Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Tong Zhang <ztong0001@gmail.com>
Link: https://lore.kernel.org/r/20220730033335.74153-4-ztong0001@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 180 insertions, 0 deletions

diff --git a/drivers/staging/rtl8192u/r8192U_debugfs.c b/drivers/staging/rtl8192u/r8192U_debugfs.c
new file mode 100644
index 000000000000..c64504346657
--- /dev/null
+++ b/drivers/staging/rtl8192u/r8192U_debugfs.c
@@ -0,0 +1,180 @@
+// SPDX-License-Identifier: GPL-2.0
+/****************************************************************************
+ *   -----------------------------DEGUGFS STUFF-------------------------
+ ****************************************************************************/
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+#include "r8192U.h"
+
+#define KBUILD_MODNAME "r8192u_usb"
+
+static int rtl8192_usb_stats_ap_show(struct seq_file *m, void *v)
+{
+	struct net_device *dev = m->private;
+	struct r8192_priv *priv = ieee80211_priv(dev);
+	struct ieee80211_device *ieee = priv->ieee80211;
+	struct ieee80211_network *target;
+
+	list_for_each_entry(target, &ieee->network_list, list) {
+		const char *wpa = "non_WPA";
+
+		if (target->wpa_ie_len > 0 || target->rsn_ie_len > 0)
+			wpa = "WPA";
+
+		seq_printf(m, "%s %s\n", target->ssid, wpa);
+	}
+
+	return 0;
+}
+
+static int rtl8192_usb_registers_show(struct seq_file *m, void *v)
+{
+	struct net_device *dev = m->private;
+	int i, n, max = 0xff;
+	u8 byte_rd;
+
+	seq_puts(m, "\n####################page 0##################\n ");
+
+	for (n = 0; n <= max;) {
+		seq_printf(m, "\nD:  %2x > ", n);
+
+		for (i = 0; i < 16 && n <= max; i++, n++) {
+			read_nic_byte(dev, 0x000 | n, &byte_rd);
+			seq_printf(m, "%2x ", byte_rd);
+		}
+	}
+
+	seq_puts(m, "\n####################page 1##################\n ");
+	for (n = 0; n <= max;) {
+		seq_printf(m, "\nD:  %2x > ", n);
+
+		for (i = 0; i < 16 && n <= max; i++, n++) {
+			read_nic_byte(dev, 0x100 | n, &byte_rd);
+			seq_printf(m, "%2x ", byte_rd);
+		}
+	}
+
+	seq_puts(m, "\n####################page 3##################\n ");
+	for (n = 0; n <= max;) {
+		seq_printf(m, "\nD:  %2x > ", n);
+
+		for (i = 0; i < 16 && n <= max; i++, n++) {
+			read_nic_byte(dev, 0x300 | n, &byte_rd);
+			seq_printf(m, "%2x ", byte_rd);
+		}
+	}
+
+	seq_putc(m, '\n');
+	return 0;
+}
+
+static int rtl8192_usb_stats_tx_show(struct seq_file *m, void *v)
+{
+	struct net_device *dev = m->private;
+	struct r8192_priv *priv = ieee80211_priv(dev);
+
+	seq_printf(m,
+		   "TX VI priority ok int: %lu\n"
+		   "TX VI priority error int: %lu\n"
+		   "TX VO priority ok int: %lu\n"
+		   "TX VO priority error int: %lu\n"
+		   "TX BE priority ok int: %lu\n"
+		   "TX BE priority error int: %lu\n"
+		   "TX BK priority ok int: %lu\n"
+		   "TX BK priority error int: %lu\n"
+		   "TX MANAGE priority ok int: %lu\n"
+		   "TX MANAGE priority error int: %lu\n"
+		   "TX BEACON priority ok int: %lu\n"
+		   "TX BEACON priority error int: %lu\n"
+		   "TX queue resume: %lu\n"
+		   "TX queue stopped?: %d\n"
+		   "TX fifo overflow: %lu\n"
+		   "TX VI queue: %d\n"
+		   "TX VO queue: %d\n"
+		   "TX BE queue: %d\n"
+		   "TX BK queue: %d\n"
+		   "TX VI dropped: %lu\n"
+		   "TX VO dropped: %lu\n"
+		   "TX BE dropped: %lu\n"
+		   "TX BK dropped: %lu\n"
+		   "TX total data packets %lu\n",
+		   priv->stats.txviokint,
+		   priv->stats.txvierr,
+		   priv->stats.txvookint,
+		   priv->stats.txvoerr,
+		   priv->stats.txbeokint,
+		   priv->stats.txbeerr,
+		   priv->stats.txbkokint,
+		   priv->stats.txbkerr,
+		   priv->stats.txmanageokint,
+		   priv->stats.txmanageerr,
+		   priv->stats.txbeaconokint,
+		   priv->stats.txbeaconerr,
+		   priv->stats.txresumed,
+		   netif_queue_stopped(dev),
+		   priv->stats.txoverflow,
+		   atomic_read(&(priv->tx_pending[VI_PRIORITY])),
+		   atomic_read(&(priv->tx_pending[VO_PRIORITY])),
+		   atomic_read(&(priv->tx_pending[BE_PRIORITY])),
+		   atomic_read(&(priv->tx_pending[BK_PRIORITY])),
+		   priv->stats.txvidrop,
+		   priv->stats.txvodrop,
+		   priv->stats.txbedrop,
+		   priv->stats.txbkdrop,
+		   priv->stats.txdatapkt
+		);
+
+	return 0;
+}
+
+static int rtl8192_usb_stats_rx_show(struct seq_file *m, void *v)
+{
+	struct net_device *dev = m->private;
+	struct r8192_priv *priv = ieee80211_priv(dev);
+
+	seq_printf(m,
+		   "RX packets: %lu\n"
+		   "RX urb status error: %lu\n"
+		   "RX invalid urb error: %lu\n",
+		   priv->stats.rxoktotal,
+		   priv->stats.rxstaterr,
+		   priv->stats.rxurberr);
+
+	return 0;
+}
+
+DEFINE_SHOW_ATTRIBUTE(rtl8192_usb_stats_rx);
+DEFINE_SHOW_ATTRIBUTE(rtl8192_usb_stats_tx);
+DEFINE_SHOW_ATTRIBUTE(rtl8192_usb_stats_ap);
+DEFINE_SHOW_ATTRIBUTE(rtl8192_usb_registers);
+
+void rtl8192_debugfs_init_one(struct net_device *dev)
+{
+	struct r8192_priv *priv = ieee80211_priv(dev);
+	struct dentry *parent_dir = debugfs_lookup(KBUILD_MODNAME, NULL);
+	struct dentry *dir = debugfs_create_dir(dev->name, parent_dir);
+
+	debugfs_create_file("stats-rx", 0444, dir, dev, &rtl8192_usb_stats_rx_fops);
+	debugfs_create_file("stats-tx", 0444, dir, dev, &rtl8192_usb_stats_tx_fops);
+	debugfs_create_file("stats-ap", 0444, dir, dev, &rtl8192_usb_stats_ap_fops);
+	debugfs_create_file("registers", 0444, dir, dev, &rtl8192_usb_registers_fops);
+
+	priv->debugfs_dir = dir;
+}
+
+void rtl8192_debugfs_exit_one(struct net_device *dev)
+{
+	struct r8192_priv *priv = ieee80211_priv(dev);
+
+	debugfs_remove_recursive(priv->debugfs_dir);
+}
+
+void rtl8192_debugfs_init(void)
+{
+	debugfs_create_dir(KBUILD_MODNAME, NULL);
+}
+
+void rtl8192_debugfs_exit(void)
+{
+	debugfs_remove_recursive(debugfs_lookup(KBUILD_MODNAME, NULL));
+}