linux/drivers/hid/hid-wiimote-debug.c
Thomas Gleixner 2874c5fd28 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 3029 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:32 -07:00

223 lines
4.7 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Debug support for HID Nintendo Wii / Wii U peripherals
* Copyright (c) 2011-2013 David Herrmann <dh.herrmann@gmail.com>
*/
/*
*/
#include <linux/debugfs.h>
#include <linux/module.h>
#include <linux/seq_file.h>
#include <linux/spinlock.h>
#include <linux/uaccess.h>
#include "hid-wiimote.h"
struct wiimote_debug {
struct wiimote_data *wdata;
struct dentry *eeprom;
struct dentry *drm;
};
static ssize_t wiidebug_eeprom_read(struct file *f, char __user *u, size_t s,
loff_t *off)
{
struct wiimote_debug *dbg = f->private_data;
struct wiimote_data *wdata = dbg->wdata;
unsigned long flags;
ssize_t ret;
char buf[16];
__u16 size = 0;
if (s == 0)
return -EINVAL;
if (*off > 0xffffff)
return 0;
if (s > 16)
s = 16;
ret = wiimote_cmd_acquire(wdata);
if (ret)
return ret;
spin_lock_irqsave(&wdata->state.lock, flags);
wdata->state.cmd_read_size = s;
wdata->state.cmd_read_buf = buf;
wiimote_cmd_set(wdata, WIIPROTO_REQ_RMEM, *off & 0xffff);
wiiproto_req_reeprom(wdata, *off, s);
spin_unlock_irqrestore(&wdata->state.lock, flags);
ret = wiimote_cmd_wait(wdata);
if (!ret)
size = wdata->state.cmd_read_size;
spin_lock_irqsave(&wdata->state.lock, flags);
wdata->state.cmd_read_buf = NULL;
spin_unlock_irqrestore(&wdata->state.lock, flags);
wiimote_cmd_release(wdata);
if (ret)
return ret;
else if (size == 0)
return -EIO;
if (copy_to_user(u, buf, size))
return -EFAULT;
*off += size;
ret = size;
return ret;
}
static const struct file_operations wiidebug_eeprom_fops = {
.owner = THIS_MODULE,
.open = simple_open,
.read = wiidebug_eeprom_read,
.llseek = generic_file_llseek,
};
static const char *wiidebug_drmmap[] = {
[WIIPROTO_REQ_NULL] = "NULL",
[WIIPROTO_REQ_DRM_K] = "K",
[WIIPROTO_REQ_DRM_KA] = "KA",
[WIIPROTO_REQ_DRM_KE] = "KE",
[WIIPROTO_REQ_DRM_KAI] = "KAI",
[WIIPROTO_REQ_DRM_KEE] = "KEE",
[WIIPROTO_REQ_DRM_KAE] = "KAE",
[WIIPROTO_REQ_DRM_KIE] = "KIE",
[WIIPROTO_REQ_DRM_KAIE] = "KAIE",
[WIIPROTO_REQ_DRM_E] = "E",
[WIIPROTO_REQ_DRM_SKAI1] = "SKAI1",
[WIIPROTO_REQ_DRM_SKAI2] = "SKAI2",
[WIIPROTO_REQ_MAX] = NULL
};
static int wiidebug_drm_show(struct seq_file *f, void *p)
{
struct wiimote_debug *dbg = f->private;
const char *str = NULL;
unsigned long flags;
__u8 drm;
spin_lock_irqsave(&dbg->wdata->state.lock, flags);
drm = dbg->wdata->state.drm;
spin_unlock_irqrestore(&dbg->wdata->state.lock, flags);
if (drm < WIIPROTO_REQ_MAX)
str = wiidebug_drmmap[drm];
if (!str)
str = "unknown";
seq_printf(f, "%s\n", str);
return 0;
}
static int wiidebug_drm_open(struct inode *i, struct file *f)
{
return single_open(f, wiidebug_drm_show, i->i_private);
}
static ssize_t wiidebug_drm_write(struct file *f, const char __user *u,
size_t s, loff_t *off)
{
struct seq_file *sf = f->private_data;
struct wiimote_debug *dbg = sf->private;
unsigned long flags;
char buf[16];
ssize_t len;
int i;
if (s == 0)
return -EINVAL;
len = min((size_t) 15, s);
if (copy_from_user(buf, u, len))
return -EFAULT;
buf[len] = 0;
for (i = 0; i < WIIPROTO_REQ_MAX; ++i) {
if (!wiidebug_drmmap[i])
continue;
if (!strcasecmp(buf, wiidebug_drmmap[i]))
break;
}
if (i == WIIPROTO_REQ_MAX)
i = simple_strtoul(buf, NULL, 16);
spin_lock_irqsave(&dbg->wdata->state.lock, flags);
dbg->wdata->state.flags &= ~WIIPROTO_FLAG_DRM_LOCKED;
wiiproto_req_drm(dbg->wdata, (__u8) i);
if (i != WIIPROTO_REQ_NULL)
dbg->wdata->state.flags |= WIIPROTO_FLAG_DRM_LOCKED;
spin_unlock_irqrestore(&dbg->wdata->state.lock, flags);
return len;
}
static const struct file_operations wiidebug_drm_fops = {
.owner = THIS_MODULE,
.open = wiidebug_drm_open,
.read = seq_read,
.llseek = seq_lseek,
.write = wiidebug_drm_write,
.release = single_release,
};
int wiidebug_init(struct wiimote_data *wdata)
{
struct wiimote_debug *dbg;
unsigned long flags;
int ret = -ENOMEM;
dbg = kzalloc(sizeof(*dbg), GFP_KERNEL);
if (!dbg)
return -ENOMEM;
dbg->wdata = wdata;
dbg->eeprom = debugfs_create_file("eeprom", S_IRUSR,
dbg->wdata->hdev->debug_dir, dbg, &wiidebug_eeprom_fops);
if (!dbg->eeprom)
goto err;
dbg->drm = debugfs_create_file("drm", S_IRUSR,
dbg->wdata->hdev->debug_dir, dbg, &wiidebug_drm_fops);
if (!dbg->drm)
goto err_drm;
spin_lock_irqsave(&wdata->state.lock, flags);
wdata->debug = dbg;
spin_unlock_irqrestore(&wdata->state.lock, flags);
return 0;
err_drm:
debugfs_remove(dbg->eeprom);
err:
kfree(dbg);
return ret;
}
void wiidebug_deinit(struct wiimote_data *wdata)
{
struct wiimote_debug *dbg = wdata->debug;
unsigned long flags;
if (!dbg)
return;
spin_lock_irqsave(&wdata->state.lock, flags);
wdata->debug = NULL;
spin_unlock_irqrestore(&wdata->state.lock, flags);
debugfs_remove(dbg->drm);
debugfs_remove(dbg->eeprom);
kfree(dbg);
}