linux/drivers/hid/hid-wiimote-debug.c
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   1/*
   2 * Debug support for HID Nintendo Wii / Wii U peripherals
   3 * Copyright (c) 2011-2013 David Herrmann <dh.herrmann@gmail.com>
   4 */
   5
   6/*
   7 * This program is free software; you can redistribute it and/or modify it
   8 * under the terms of the GNU General Public License as published by the Free
   9 * Software Foundation; either version 2 of the License, or (at your option)
  10 * any later version.
  11 */
  12
  13#include <linux/debugfs.h>
  14#include <linux/module.h>
  15#include <linux/seq_file.h>
  16#include <linux/spinlock.h>
  17#include <linux/uaccess.h>
  18#include "hid-wiimote.h"
  19
  20struct wiimote_debug {
  21        struct wiimote_data *wdata;
  22        struct dentry *eeprom;
  23        struct dentry *drm;
  24};
  25
  26static ssize_t wiidebug_eeprom_read(struct file *f, char __user *u, size_t s,
  27                                                                loff_t *off)
  28{
  29        struct wiimote_debug *dbg = f->private_data;
  30        struct wiimote_data *wdata = dbg->wdata;
  31        unsigned long flags;
  32        ssize_t ret;
  33        char buf[16];
  34        __u16 size = 0;
  35
  36        if (s == 0)
  37                return -EINVAL;
  38        if (*off > 0xffffff)
  39                return 0;
  40        if (s > 16)
  41                s = 16;
  42
  43        ret = wiimote_cmd_acquire(wdata);
  44        if (ret)
  45                return ret;
  46
  47        spin_lock_irqsave(&wdata->state.lock, flags);
  48        wdata->state.cmd_read_size = s;
  49        wdata->state.cmd_read_buf = buf;
  50        wiimote_cmd_set(wdata, WIIPROTO_REQ_RMEM, *off & 0xffff);
  51        wiiproto_req_reeprom(wdata, *off, s);
  52        spin_unlock_irqrestore(&wdata->state.lock, flags);
  53
  54        ret = wiimote_cmd_wait(wdata);
  55        if (!ret)
  56                size = wdata->state.cmd_read_size;
  57
  58        spin_lock_irqsave(&wdata->state.lock, flags);
  59        wdata->state.cmd_read_buf = NULL;
  60        spin_unlock_irqrestore(&wdata->state.lock, flags);
  61
  62        wiimote_cmd_release(wdata);
  63
  64        if (ret)
  65                return ret;
  66        else if (size == 0)
  67                return -EIO;
  68
  69        if (copy_to_user(u, buf, size))
  70                return -EFAULT;
  71
  72        *off += size;
  73        ret = size;
  74
  75        return ret;
  76}
  77
  78static const struct file_operations wiidebug_eeprom_fops = {
  79        .owner = THIS_MODULE,
  80        .open = simple_open,
  81        .read = wiidebug_eeprom_read,
  82        .llseek = generic_file_llseek,
  83};
  84
  85static const char *wiidebug_drmmap[] = {
  86        [WIIPROTO_REQ_NULL] = "NULL",
  87        [WIIPROTO_REQ_DRM_K] = "K",
  88        [WIIPROTO_REQ_DRM_KA] = "KA",
  89        [WIIPROTO_REQ_DRM_KE] = "KE",
  90        [WIIPROTO_REQ_DRM_KAI] = "KAI",
  91        [WIIPROTO_REQ_DRM_KEE] = "KEE",
  92        [WIIPROTO_REQ_DRM_KAE] = "KAE",
  93        [WIIPROTO_REQ_DRM_KIE] = "KIE",
  94        [WIIPROTO_REQ_DRM_KAIE] = "KAIE",
  95        [WIIPROTO_REQ_DRM_E] = "E",
  96        [WIIPROTO_REQ_DRM_SKAI1] = "SKAI1",
  97        [WIIPROTO_REQ_DRM_SKAI2] = "SKAI2",
  98        [WIIPROTO_REQ_MAX] = NULL
  99};
 100
 101static int wiidebug_drm_show(struct seq_file *f, void *p)
 102{
 103        struct wiimote_debug *dbg = f->private;
 104        const char *str = NULL;
 105        unsigned long flags;
 106        __u8 drm;
 107
 108        spin_lock_irqsave(&dbg->wdata->state.lock, flags);
 109        drm = dbg->wdata->state.drm;
 110        spin_unlock_irqrestore(&dbg->wdata->state.lock, flags);
 111
 112        if (drm < WIIPROTO_REQ_MAX)
 113                str = wiidebug_drmmap[drm];
 114        if (!str)
 115                str = "unknown";
 116
 117        seq_printf(f, "%s\n", str);
 118
 119        return 0;
 120}
 121
 122static int wiidebug_drm_open(struct inode *i, struct file *f)
 123{
 124        return single_open(f, wiidebug_drm_show, i->i_private);
 125}
 126
 127static ssize_t wiidebug_drm_write(struct file *f, const char __user *u,
 128                                                        size_t s, loff_t *off)
 129{
 130        struct seq_file *sf = f->private_data;
 131        struct wiimote_debug *dbg = sf->private;
 132        unsigned long flags;
 133        char buf[16];
 134        ssize_t len;
 135        int i;
 136
 137        if (s == 0)
 138                return -EINVAL;
 139
 140        len = min((size_t) 15, s);
 141        if (copy_from_user(buf, u, len))
 142                return -EFAULT;
 143
 144        buf[len] = 0;
 145
 146        for (i = 0; i < WIIPROTO_REQ_MAX; ++i) {
 147                if (!wiidebug_drmmap[i])
 148                        continue;
 149                if (!strcasecmp(buf, wiidebug_drmmap[i]))
 150                        break;
 151        }
 152
 153        if (i == WIIPROTO_REQ_MAX)
 154                i = simple_strtoul(buf, NULL, 16);
 155
 156        spin_lock_irqsave(&dbg->wdata->state.lock, flags);
 157        dbg->wdata->state.flags &= ~WIIPROTO_FLAG_DRM_LOCKED;
 158        wiiproto_req_drm(dbg->wdata, (__u8) i);
 159        if (i != WIIPROTO_REQ_NULL)
 160                dbg->wdata->state.flags |= WIIPROTO_FLAG_DRM_LOCKED;
 161        spin_unlock_irqrestore(&dbg->wdata->state.lock, flags);
 162
 163        return len;
 164}
 165
 166static const struct file_operations wiidebug_drm_fops = {
 167        .owner = THIS_MODULE,
 168        .open = wiidebug_drm_open,
 169        .read = seq_read,
 170        .llseek = seq_lseek,
 171        .write = wiidebug_drm_write,
 172        .release = single_release,
 173};
 174
 175int wiidebug_init(struct wiimote_data *wdata)
 176{
 177        struct wiimote_debug *dbg;
 178        unsigned long flags;
 179        int ret = -ENOMEM;
 180
 181        dbg = kzalloc(sizeof(*dbg), GFP_KERNEL);
 182        if (!dbg)
 183                return -ENOMEM;
 184
 185        dbg->wdata = wdata;
 186
 187        dbg->eeprom = debugfs_create_file("eeprom", S_IRUSR,
 188                dbg->wdata->hdev->debug_dir, dbg, &wiidebug_eeprom_fops);
 189        if (!dbg->eeprom)
 190                goto err;
 191
 192        dbg->drm = debugfs_create_file("drm", S_IRUSR,
 193                        dbg->wdata->hdev->debug_dir, dbg, &wiidebug_drm_fops);
 194        if (!dbg->drm)
 195                goto err_drm;
 196
 197        spin_lock_irqsave(&wdata->state.lock, flags);
 198        wdata->debug = dbg;
 199        spin_unlock_irqrestore(&wdata->state.lock, flags);
 200
 201        return 0;
 202
 203err_drm:
 204        debugfs_remove(dbg->eeprom);
 205err:
 206        kfree(dbg);
 207        return ret;
 208}
 209
 210void wiidebug_deinit(struct wiimote_data *wdata)
 211{
 212        struct wiimote_debug *dbg = wdata->debug;
 213        unsigned long flags;
 214
 215        if (!dbg)
 216                return;
 217
 218        spin_lock_irqsave(&wdata->state.lock, flags);
 219        wdata->debug = NULL;
 220        spin_unlock_irqrestore(&wdata->state.lock, flags);
 221
 222        debugfs_remove(dbg->drm);
 223        debugfs_remove(dbg->eeprom);
 224        kfree(dbg);
 225}
 226
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