drivers/net/wireless/ath/ath9k/dfs_debug.c

   1 /*
   2  * Copyright (c) 2008-2011 Atheros Communications Inc.
   3  * Copyright (c) 2011 Neratec Solutions AG
   4  *
   5  * Permission to use, copy, modify, and/or distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 #include <linux/debugfs.h>
  19 #include <linux/export.h>
  20
  21 #include "ath9k.h"
  22 #include "dfs_debug.h"
  23
  24 #define ATH9K_DFS_STAT(s, p) \
  25         len += snprintf(buf + len, size - len, "%28s : %10u\n", s, \
  26                         sc->debug.stats.dfs_stats.p);
  27
  28 static ssize_t read_file_dfs(struct file *file, char __user *user_buf,
  29                              size_t count, loff_t *ppos)
  30 {
  31         struct ath_softc *sc = file->private_data;
  32         struct ath9k_hw_version *hw_ver = &sc->sc_ah->hw_version;
  33         char *buf;
  34         unsigned int len = 0, size = 8000;
  35         ssize_t retval = 0;
  36
  37         buf = kzalloc(size, GFP_KERNEL);
  38         if (buf == NULL)
  39                 return -ENOMEM;
  40
  41         len += snprintf(buf + len, size - len, "DFS support for "
  42                         "macVersion = 0x%x, macRev = 0x%x: %s\n",
  43                         hw_ver->macVersion, hw_ver->macRev,
  44                         (sc->sc_ah->caps.hw_caps & ATH9K_HW_CAP_DFS) ?
  45                                         "enabled" : "disabled");
  46         ATH9K_DFS_STAT("DFS pulses detected     ", pulses_detected);
  47         ATH9K_DFS_STAT("Datalen discards        ", datalen_discards);
  48         ATH9K_DFS_STAT("RSSI discards           ", rssi_discards);
  49         ATH9K_DFS_STAT("BW info discards        ", bwinfo_discards);
  50         ATH9K_DFS_STAT("Primary channel pulses  ", pri_phy_errors);
  51         ATH9K_DFS_STAT("Secondary channel pulses", ext_phy_errors);
  52         ATH9K_DFS_STAT("Dual channel pulses     ", dc_phy_errors);
  53
  54         if (len > size)
  55                 len = size;
  56
  57         retval = simple_read_from_buffer(user_buf, count, ppos, buf, len);
  58         kfree(buf);
  59
  60         return retval;
  61 }
  62
  63 static int ath9k_dfs_debugfs_open(struct inode *inode, struct file *file)
  64 {
  65         file->private_data = inode->i_private;
  66
  67         return 0;
  68 }
  69
  70 static const struct file_operations fops_dfs_stats = {
  71         .read = read_file_dfs,
  72         .open = ath9k_dfs_debugfs_open,
  73         .owner = THIS_MODULE,
  74         .llseek = default_llseek,
  75 };
  76
  77 void ath9k_dfs_init_debug(struct ath_softc *sc)
  78 {
  79         debugfs_create_file("dfs_stats", S_IRUSR,
  80                             sc->debug.debugfs_phy, sc, &fops_dfs_stats);
  81 }