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// SPDX-License-Identifier: GPL-2.0
/*
* Cadence USBSS DRD Controller DebugFS filer.
*
* Copyright (C) 2018-2019 Cadence.
*
* Author: Pawel Laszczak <pawell@cadence.com>
*/
#include <linux/types.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/uaccess.h>
#include "core.h"
#include "gadget.h"
#include "drd.h"
static const char *const cdns3_mode[] = {
[USB_DR_MODE_UNKNOWN] = "unknown",
[USB_DR_MODE_OTG] = "otg",
[USB_DR_MODE_HOST] = "host",
[USB_DR_MODE_PERIPHERAL] = "device",
};
static int cdns3_mode_show(struct seq_file *s, void *unused)
{
struct cdns3 *cdns = s->private;
seq_puts(s, cdns3_mode[cdns->current_dr_mode]);
return 0;
}
static int cdns3_mode_open(struct inode *inode, struct file *file)
{
return single_open(file, cdns3_mode_show, inode->i_private);
}
static ssize_t cdns3_mode_write(struct file *file,
const char __user *ubuf,
size_t count, loff_t *ppos)
{
struct seq_file *s = file->private_data;
struct cdns3 *cdns = s->private;
char buf[32];
int ret;
if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
return -EFAULT;
if (cdns->debug_disable) {
dev_err(cdns->dev,
"Mode can't be changed when disable is set\n");
return -EPERM;
}
ret = match_string(cdns3_mode, ARRAY_SIZE(cdns3_mode), buf);
if (ret < 0 || ret == USB_DR_MODE_UNKNOWN) {
dev_err(cdns->dev, "Failed: incorrect mode setting\n");
return -EINVAL;
}
if (cdns->current_dr_mode != ret) {
cdns->desired_dr_mode = ret;
cdns3_role_stop(cdns);
ret = cdns3_drd_update_mode(cdns);
if (ret)
return ret;
queue_work(system_freezable_wq, &cdns->role_switch_wq);
}
return count;
}
static const struct file_operations cdns3_mode_fops = {
.open = cdns3_mode_open,
.write = cdns3_mode_write,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int cdns3_disable_show(struct seq_file *s, void *unused)
{
struct cdns3 *cdns = s->private;
if (!cdns->debug_disable)
seq_puts(s, "0\n");
else
seq_puts(s, "1\n");
return 0;
}
static ssize_t cdns3_disable_write(struct file *file,
const char __user *ubuf,
size_t count, loff_t *ppos)
{
struct seq_file *s = file->private_data;
struct cdns3 *cdns = s->private;
bool disable;
char buf[16];
if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
return -EFAULT;
if (kstrtobool(buf, &disable)) {
dev_err(cdns->dev, "wrong setting\n");
return -EINVAL;
}
if (disable != cdns->debug_disable) {
cdns->debug_disable = disable;
queue_work(system_freezable_wq, &cdns->role_switch_wq);
}
return count;
}
static int cdns3_disable_open(struct inode *inode, struct file *file)
{
return single_open(file, cdns3_disable_show, inode->i_private);
}
static const struct file_operations cdns3_disable_fops = {
.open = cdns3_disable_open,
.write = cdns3_disable_write,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
void cdns3_debugfs_init(struct cdns3 *cdns)
{
struct dentry *root;
root = debugfs_create_dir(dev_name(cdns->dev), NULL);
cdns->root = root;
if (IS_ENABLED(CONFIG_USB_CDNS3_GADGET) &&
IS_ENABLED(CONFIG_USB_CDNS3_HOST))
debugfs_create_file("mode", 0644, root, cdns,
&cdns3_mode_fops);
debugfs_create_file("disable", 0644, root, cdns,
&cdns3_disable_fops);
}
void cdns3_debugfs_exit(struct cdns3 *cdns)
{
debugfs_remove_recursive(cdns->root);
}
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