drivers/net/wireless/brcm80211/brcmfmac/dhd_dbg.c

   1 /*
   2  * Copyright (c) 2012 Broadcom Corporation
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  11  * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
  13  * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
  14  * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16 #include <linux/debugfs.h>
  17 #include <linux/netdevice.h>
  18 #include <linux/module.h>
  19
  20 #include <brcmu_wifi.h>
  21 #include <brcmu_utils.h>
  22 #include "dhd.h"
  23 #include "dhd_bus.h"
  24 #include "dhd_dbg.h"
  25
  26 static struct dentry *root_folder;
  27
  28 void brcmf_debugfs_init(void)
  29 {
  30         root_folder = debugfs_create_dir(KBUILD_MODNAME, NULL);
  31         if (IS_ERR(root_folder))
  32                 root_folder = NULL;
  33 }
  34
  35 void brcmf_debugfs_exit(void)
  36 {
  37         if (!root_folder)
  38                 return;
  39
  40         debugfs_remove_recursive(root_folder);
  41         root_folder = NULL;
  42 }
  43
  44 static int brcmf_debugfs_chipinfo_read(struct seq_file *seq, void *data)
  45 {
  46         struct brcmf_bus *bus = dev_get_drvdata(seq->private);
  47
  48         seq_printf(seq, "chip: %x(%u) rev %u\n",
  49                    bus->chip, bus->chip, bus->chiprev);
  50         return 0;
  51 }
  52
  53 int brcmf_debugfs_attach(struct brcmf_pub *drvr)
  54 {
  55         struct device *dev = drvr->bus_if->dev;
  56
  57         if (!root_folder)
  58                 return -ENODEV;
  59
  60         drvr->dbgfs_dir = debugfs_create_dir(dev_name(dev), root_folder);
  61         brcmf_debugfs_add_entry(drvr, "chipinfo", brcmf_debugfs_chipinfo_read);
  62
  63         return PTR_ERR_OR_ZERO(drvr->dbgfs_dir);
  64 }
  65
  66 void brcmf_debugfs_detach(struct brcmf_pub *drvr)
  67 {
  68         if (!IS_ERR_OR_NULL(drvr->dbgfs_dir))
  69                 debugfs_remove_recursive(drvr->dbgfs_dir);
  70 }
  71
  72 struct dentry *brcmf_debugfs_get_devdir(struct brcmf_pub *drvr)
  73 {
  74         return drvr->dbgfs_dir;
  75 }
  76
  77 struct brcmf_debugfs_entry {
  78         int (*read)(struct seq_file *seq, void *data);
  79         struct brcmf_pub *drvr;
  80 };
  81
  82 static int brcmf_debugfs_entry_open(struct inode *inode, struct file *f)
  83 {
  84         struct brcmf_debugfs_entry *entry = inode->i_private;
  85
  86         return single_open(f, entry->read, entry->drvr->bus_if->dev);
  87 }
  88
  89 static const struct file_operations brcmf_debugfs_def_ops = {
  90         .owner = THIS_MODULE,
  91         .open = brcmf_debugfs_entry_open,
  92         .release = single_release,
  93         .read = seq_read,
  94         .llseek = seq_lseek
  95 };
  96
  97 int brcmf_debugfs_add_entry(struct brcmf_pub *drvr, const char *fn,
  98                             int (*read_fn)(struct seq_file *seq, void *data))
  99 {
 100         struct dentry *dentry =  drvr->dbgfs_dir;
 101         struct brcmf_debugfs_entry *entry;
 102
 103         if (IS_ERR_OR_NULL(dentry))
 104                 return -ENOENT;
 105
 106         entry = devm_kzalloc(drvr->bus_if->dev, sizeof(*entry), GFP_KERNEL);
 107         if (!entry)
 108                 return -ENOMEM;
 109
 110         entry->read = read_fn;
 111         entry->drvr = drvr;
 112
 113         dentry = debugfs_create_file(fn, S_IRUGO, dentry, entry,
 114                                      &brcmf_debugfs_def_ops);
 115
 116         return PTR_ERR_OR_ZERO(dentry);
 117 }