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![David Herrmann](/assets/img/avatar_default.png)
We need to correctly zero-terminate the input to parse it. Otherwise, we always end up interpreting it as numbers. Furthermore, we actually want hexadecimal numbers instead of decimal. As it is a debugfs interface, we can change the API at any time. Signed-off-by: David Herrmann <dh.herrmann@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
225 lines
4.9 KiB
C
225 lines
4.9 KiB
C
/*
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* Debug support for HID Nintendo Wii / Wii U peripherals
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* Copyright (c) 2011-2013 David Herrmann <dh.herrmann@gmail.com>
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*/
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/*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*/
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#include <linux/debugfs.h>
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#include <linux/module.h>
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#include <linux/seq_file.h>
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#include <linux/spinlock.h>
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#include <linux/uaccess.h>
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#include "hid-wiimote.h"
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struct wiimote_debug {
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struct wiimote_data *wdata;
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struct dentry *eeprom;
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struct dentry *drm;
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};
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static ssize_t wiidebug_eeprom_read(struct file *f, char __user *u, size_t s,
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loff_t *off)
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{
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struct wiimote_debug *dbg = f->private_data;
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struct wiimote_data *wdata = dbg->wdata;
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unsigned long flags;
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ssize_t ret;
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char buf[16];
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__u16 size = 0;
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if (s == 0)
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return -EINVAL;
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if (*off > 0xffffff)
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return 0;
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if (s > 16)
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s = 16;
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ret = wiimote_cmd_acquire(wdata);
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if (ret)
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return ret;
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spin_lock_irqsave(&wdata->state.lock, flags);
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wdata->state.cmd_read_size = s;
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wdata->state.cmd_read_buf = buf;
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wiimote_cmd_set(wdata, WIIPROTO_REQ_RMEM, *off & 0xffff);
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wiiproto_req_reeprom(wdata, *off, s);
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spin_unlock_irqrestore(&wdata->state.lock, flags);
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ret = wiimote_cmd_wait(wdata);
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if (!ret)
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size = wdata->state.cmd_read_size;
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spin_lock_irqsave(&wdata->state.lock, flags);
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wdata->state.cmd_read_buf = NULL;
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spin_unlock_irqrestore(&wdata->state.lock, flags);
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wiimote_cmd_release(wdata);
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if (ret)
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return ret;
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else if (size == 0)
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return -EIO;
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if (copy_to_user(u, buf, size))
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return -EFAULT;
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*off += size;
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ret = size;
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return ret;
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}
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static const struct file_operations wiidebug_eeprom_fops = {
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.owner = THIS_MODULE,
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.open = simple_open,
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.read = wiidebug_eeprom_read,
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.llseek = generic_file_llseek,
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};
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static const char *wiidebug_drmmap[] = {
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[WIIPROTO_REQ_NULL] = "NULL",
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[WIIPROTO_REQ_DRM_K] = "K",
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[WIIPROTO_REQ_DRM_KA] = "KA",
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[WIIPROTO_REQ_DRM_KE] = "KE",
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[WIIPROTO_REQ_DRM_KAI] = "KAI",
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[WIIPROTO_REQ_DRM_KEE] = "KEE",
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[WIIPROTO_REQ_DRM_KAE] = "KAE",
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[WIIPROTO_REQ_DRM_KIE] = "KIE",
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[WIIPROTO_REQ_DRM_KAIE] = "KAIE",
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[WIIPROTO_REQ_DRM_E] = "E",
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[WIIPROTO_REQ_DRM_SKAI1] = "SKAI1",
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[WIIPROTO_REQ_DRM_SKAI2] = "SKAI2",
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[WIIPROTO_REQ_MAX] = NULL
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};
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static int wiidebug_drm_show(struct seq_file *f, void *p)
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{
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struct wiimote_debug *dbg = f->private;
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const char *str = NULL;
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unsigned long flags;
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__u8 drm;
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spin_lock_irqsave(&dbg->wdata->state.lock, flags);
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drm = dbg->wdata->state.drm;
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spin_unlock_irqrestore(&dbg->wdata->state.lock, flags);
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if (drm < WIIPROTO_REQ_MAX)
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str = wiidebug_drmmap[drm];
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if (!str)
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str = "unknown";
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seq_printf(f, "%s\n", str);
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return 0;
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}
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static int wiidebug_drm_open(struct inode *i, struct file *f)
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{
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return single_open(f, wiidebug_drm_show, i->i_private);
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}
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static ssize_t wiidebug_drm_write(struct file *f, const char __user *u,
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size_t s, loff_t *off)
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{
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struct seq_file *sf = f->private_data;
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struct wiimote_debug *dbg = sf->private;
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unsigned long flags;
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char buf[16];
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ssize_t len;
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int i;
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if (s == 0)
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return -EINVAL;
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len = min((size_t) 15, s);
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if (copy_from_user(buf, u, len))
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return -EFAULT;
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buf[len] = 0;
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for (i = 0; i < WIIPROTO_REQ_MAX; ++i) {
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if (!wiidebug_drmmap[i])
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continue;
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if (!strcasecmp(buf, wiidebug_drmmap[i]))
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break;
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}
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if (i == WIIPROTO_REQ_MAX)
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i = simple_strtoul(buf, NULL, 16);
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spin_lock_irqsave(&dbg->wdata->state.lock, flags);
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dbg->wdata->state.flags &= ~WIIPROTO_FLAG_DRM_LOCKED;
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wiiproto_req_drm(dbg->wdata, (__u8) i);
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if (i != WIIPROTO_REQ_NULL)
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dbg->wdata->state.flags |= WIIPROTO_FLAG_DRM_LOCKED;
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spin_unlock_irqrestore(&dbg->wdata->state.lock, flags);
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return len;
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}
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static const struct file_operations wiidebug_drm_fops = {
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.owner = THIS_MODULE,
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.open = wiidebug_drm_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.write = wiidebug_drm_write,
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.release = single_release,
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};
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int wiidebug_init(struct wiimote_data *wdata)
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{
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struct wiimote_debug *dbg;
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unsigned long flags;
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int ret = -ENOMEM;
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dbg = kzalloc(sizeof(*dbg), GFP_KERNEL);
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if (!dbg)
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return -ENOMEM;
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dbg->wdata = wdata;
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dbg->eeprom = debugfs_create_file("eeprom", S_IRUSR,
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dbg->wdata->hdev->debug_dir, dbg, &wiidebug_eeprom_fops);
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if (!dbg->eeprom)
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goto err;
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dbg->drm = debugfs_create_file("drm", S_IRUSR,
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dbg->wdata->hdev->debug_dir, dbg, &wiidebug_drm_fops);
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if (!dbg->drm)
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goto err_drm;
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spin_lock_irqsave(&wdata->state.lock, flags);
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wdata->debug = dbg;
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spin_unlock_irqrestore(&wdata->state.lock, flags);
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return 0;
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err_drm:
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debugfs_remove(dbg->eeprom);
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err:
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kfree(dbg);
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return ret;
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}
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void wiidebug_deinit(struct wiimote_data *wdata)
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{
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struct wiimote_debug *dbg = wdata->debug;
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unsigned long flags;
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if (!dbg)
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return;
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spin_lock_irqsave(&wdata->state.lock, flags);
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wdata->debug = NULL;
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spin_unlock_irqrestore(&wdata->state.lock, flags);
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debugfs_remove(dbg->drm);
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debugfs_remove(dbg->eeprom);
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kfree(dbg);
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}
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