target/linux/ar71xx/files/drivers/net/ag71xx/ag71xx_debugfs.c

   1 /*
   2  *  Atheros AR71xx built-in ethernet mac driver
   3  *
   4  *  Copyright (C) 2008-2010 Gabor Juhos <juhosg@openwrt.org>
   5  *  Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
   6  *
   7  *  Based on Atheros' AG7100 driver
   8  *
   9  *  This program is free software; you can redistribute it and/or modify it
  10  *  under the terms of the GNU General Public License version 2 as published
  11  *  by the Free Software Foundation.
  12  */
  13
  14 #include <linux/debugfs.h>
  15
  16 #include "ag71xx.h"
  17
  18 static struct dentry *ag71xx_debugfs_root;
  19
  20 static int ag71xx_debugfs_generic_open(struct inode *inode, struct file *file)
  21 {
  22         file->private_data = inode->i_private;
  23         return 0;
  24 }
  25
  26 void ag71xx_debugfs_update_int_stats(struct ag71xx *ag, u32 status)
  27 {
  28         if (status)
  29                 ag->debug.int_stats.total++;
  30         if (status & AG71XX_INT_TX_PS)
  31                 ag->debug.int_stats.tx_ps++;
  32         if (status & AG71XX_INT_TX_UR)
  33                 ag->debug.int_stats.tx_ur++;
  34         if (status & AG71XX_INT_TX_BE)
  35                 ag->debug.int_stats.tx_be++;
  36         if (status & AG71XX_INT_RX_PR)
  37                 ag->debug.int_stats.rx_pr++;
  38         if (status & AG71XX_INT_RX_OF)
  39                 ag->debug.int_stats.rx_of++;
  40         if (status & AG71XX_INT_RX_BE)
  41                 ag->debug.int_stats.rx_be++;
  42 }
  43
  44 static ssize_t read_file_int_stats(struct file *file, char __user *user_buf,
  45                                    size_t count, loff_t *ppos)
  46 {
  47 #define PR_INT_STAT(_label, _field)                                     \
  48         len += snprintf(buf + len, sizeof(buf) - len,                   \
  49                 "%20s: %10lu\n", _label, ag->debug.int_stats._field);
  50
  51         struct ag71xx *ag = file->private_data;
  52         char buf[256];
  53         unsigned int len = 0;
  54
  55         PR_INT_STAT("TX Packet Sent", tx_ps);
  56         PR_INT_STAT("TX Underrun", tx_ur);
  57         PR_INT_STAT("TX Bus Error", tx_be);
  58         PR_INT_STAT("RX Packet Received", rx_pr);
  59         PR_INT_STAT("RX Overflow", rx_of);
  60         PR_INT_STAT("RX Bus Error", rx_be);
  61         len += snprintf(buf + len, sizeof(buf) - len, "\n");
  62         PR_INT_STAT("Total", total);
  63
  64         return simple_read_from_buffer(user_buf, count, ppos, buf, len);
  65 #undef PR_INT_STAT
  66 }
  67
  68 static const struct file_operations ag71xx_fops_int_stats = {
  69         .open   = ag71xx_debugfs_generic_open,
  70         .read   = read_file_int_stats,
  71         .owner  = THIS_MODULE
  72 };
  73
  74 void ag71xx_debugfs_exit(struct ag71xx *ag)
  75 {
  76         debugfs_remove(ag->debug.debugfs_int_stats);
  77         debugfs_remove(ag->debug.debugfs_dir);
  78 }
  79
  80 int ag71xx_debugfs_init(struct ag71xx *ag)
  81 {
  82         ag->debug.debugfs_dir = debugfs_create_dir(ag->dev->name,
  83                                                    ag71xx_debugfs_root);
  84         if (!ag->debug.debugfs_dir)
  85                 goto err;
  86
  87         ag->debug.debugfs_int_stats =
  88                         debugfs_create_file("int_stats",
  89                                             S_IRUGO,
  90                                             ag->debug.debugfs_dir,
  91                                             ag,
  92                                             &ag71xx_fops_int_stats);
  93         if (!ag->debug.debugfs_int_stats)
  94                 goto err;
  95
  96         return 0;
  97
  98  err:
  99         ag71xx_debugfs_exit(ag);
 100         return -ENOMEM;
 101 }
 102
 103 int ag71xx_debugfs_root_init(void)
 104 {
 105         if (ag71xx_debugfs_root)
 106                 return -EBUSY;
 107
 108         ag71xx_debugfs_root = debugfs_create_dir(KBUILD_MODNAME, NULL);
 109         if (!ag71xx_debugfs_root)
 110                 return -ENOENT;
 111
 112         return 0;
 113 }
 114
 115 void ag71xx_debugfs_root_exit(void)
 116 {
 117         debugfs_remove(ag71xx_debugfs_root);
 118         ag71xx_debugfs_root = NULL;
 119 }