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 #include <linux/devcoredump.h>
20 
21 #include <brcmu_wifi.h>
22 #include <brcmu_utils.h>
23 #include "core.h"
24 #include "bus.h"
25 #include "fweh.h"
26 #include "debug.h"
27 
28 static struct dentry *root_folder;
29 
30 int brcmf_debug_create_memdump(struct brcmf_bus *bus, const void *data,
31 			       size_t len)
32 {
33 	void *dump;
34 	size_t ramsize;
35 	int err;
36 
37 	ramsize = brcmf_bus_get_ramsize(bus);
38 	if (!ramsize)
39 		return -ENOTSUPP;
40 
41 	dump = vzalloc(len + ramsize);
42 	if (!dump)
43 		return -ENOMEM;
44 
45 	memcpy(dump, data, len);
46 	err = brcmf_bus_get_memdump(bus, dump + len, ramsize);
47 	if (err) {
48 		vfree(dump);
49 		return err;
50 	}
51 
52 	dev_coredumpv(bus->dev, dump, len + ramsize, GFP_KERNEL);
53 
54 	return 0;
55 }
56 
57 void brcmf_debugfs_init(void)
58 {
59 	root_folder = debugfs_create_dir(KBUILD_MODNAME, NULL);
60 	if (IS_ERR(root_folder))
61 		root_folder = NULL;
62 }
63 
64 void brcmf_debugfs_exit(void)
65 {
66 	if (!root_folder)
67 		return;
68 
69 	debugfs_remove_recursive(root_folder);
70 	root_folder = NULL;
71 }
72 
73 int brcmf_debug_attach(struct brcmf_pub *drvr)
74 {
75 	struct device *dev = drvr->bus_if->dev;
76 
77 	if (!root_folder)
78 		return -ENODEV;
79 
80 	drvr->dbgfs_dir = debugfs_create_dir(dev_name(dev), root_folder);
81 	if (IS_ERR(drvr->dbgfs_dir))
82 		return PTR_ERR(drvr->dbgfs_dir);
83 
84 	return 0;
85 }
86 
87 void brcmf_debug_detach(struct brcmf_pub *drvr)
88 {
89 	brcmf_fweh_unregister(drvr, BRCMF_E_PSM_WATCHDOG);
90 
91 	if (!IS_ERR_OR_NULL(drvr->dbgfs_dir))
92 		debugfs_remove_recursive(drvr->dbgfs_dir);
93 }
94 
95 struct dentry *brcmf_debugfs_get_devdir(struct brcmf_pub *drvr)
96 {
97 	return drvr->dbgfs_dir;
98 }
99 
100 int brcmf_debugfs_add_entry(struct brcmf_pub *drvr, const char *fn,
101 			    int (*read_fn)(struct seq_file *seq, void *data))
102 {
103 	struct dentry *e;
104 
105 	e = debugfs_create_devm_seqfile(drvr->bus_if->dev, fn,
106 					drvr->dbgfs_dir, read_fn);
107 	return PTR_ERR_OR_ZERO(e);
108 }
109