linux_kernel/drivers/net/wireless/brcm80211/brcmfmac/debug.c

/*
 * Copyright (c) 2012 Broadcom Corporation
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
#include <linux/debugfs.h>
#include <linux/netdevice.h>
#include <linux/module.h>

#include <brcmu_wifi.h>
#include <brcmu_utils.h>
#include "core.h"
#include "bus.h"
#include "debug.h"

static struct dentry *root_folder;

void brcmf_debugfs_init(void)
{
	root_folder = debugfs_create_dir(KBUILD_MODNAME, NULL);
	if (IS_ERR(root_folder))
		root_folder = NULL;
}

void brcmf_debugfs_exit(void)
{
	if (!root_folder)
		return;

	debugfs_remove_recursive(root_folder);
	root_folder = NULL;
}

static int brcmf_debugfs_chipinfo_read(struct seq_file *seq, void *data)
{
	struct brcmf_bus *bus = dev_get_drvdata(seq->private);

	seq_printf(seq, "chip: %x(%u) rev %u\n",
		   bus->chip, bus->chip, bus->chiprev);
	return 0;
}

int brcmf_debugfs_attach(struct brcmf_pub *drvr)
{
	struct device *dev = drvr->bus_if->dev;

	if (!root_folder)
		return -ENODEV;

	drvr->dbgfs_dir = debugfs_create_dir(dev_name(dev), root_folder);
	brcmf_debugfs_add_entry(drvr, "chipinfo", brcmf_debugfs_chipinfo_read);

	return PTR_ERR_OR_ZERO(drvr->dbgfs_dir);
}

void brcmf_debugfs_detach(struct brcmf_pub *drvr)
{
	if (!IS_ERR_OR_NULL(drvr->dbgfs_dir))
		debugfs_remove_recursive(drvr->dbgfs_dir);
}

struct dentry *brcmf_debugfs_get_devdir(struct brcmf_pub *drvr)
{
	return drvr->dbgfs_dir;
}

struct brcmf_debugfs_entry {
	int (*read)(struct seq_file *seq, void *data);
	struct brcmf_pub *drvr;
};

static int brcmf_debugfs_entry_open(struct inode *inode, struct file *f)
{
	struct brcmf_debugfs_entry *entry = inode->i_private;

	return single_open(f, entry->read, entry->drvr->bus_if->dev);
}

static const struct file_operations brcmf_debugfs_def_ops = {
	.owner = THIS_MODULE,
	.open = brcmf_debugfs_entry_open,
	.release = single_release,
	.read = seq_read,
	.llseek = seq_lseek
};

int brcmf_debugfs_add_entry(struct brcmf_pub *drvr, const char *fn,
			    int (*read_fn)(struct seq_file *seq, void *data))
{
	struct dentry *dentry =  drvr->dbgfs_dir;
	struct brcmf_debugfs_entry *entry;

	if (IS_ERR_OR_NULL(dentry))
		return -ENOENT;

	entry = devm_kzalloc(drvr->bus_if->dev, sizeof(*entry), GFP_KERNEL);
	if (!entry)
		return -ENOMEM;

	entry->read = read_fn;
	entry->drvr = drvr;

	dentry = debugfs_create_file(fn, S_IRUGO, dentry, entry,
				     &brcmf_debugfs_def_ops);

	return PTR_ERR_OR_ZERO(dentry);
}