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 "core.h"
23 #include "bus.h"
24 #include "debug.h"
25
26 static struct dentry *root_folder;
27
brcmf_debugfs_init(void)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
brcmf_debugfs_exit(void)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
brcmf_debugfs_chipinfo_read(struct seq_file * seq,void * data)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
brcmf_debugfs_attach(struct brcmf_pub * drvr)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
brcmf_debugfs_detach(struct brcmf_pub * drvr)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
brcmf_debugfs_get_devdir(struct brcmf_pub * drvr)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
brcmf_debugfs_entry_open(struct inode * inode,struct file * f)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
brcmf_debugfs_add_entry(struct brcmf_pub * drvr,const char * fn,int (* read_fn)(struct seq_file * seq,void * data))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 }
118