linux/drivers/hid/hid-wiimote-debug.c
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   1/*
   2 * Debug support for HID Nintendo Wiimote devices
   3 * Copyright (c) 2011 David Herrmann
   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;
  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 wiimote_debug *dbg = f->private_data;
 131        unsigned long flags;
 132        char buf[16];
 133        ssize_t len;
 134        int i;
 135
 136        if (s == 0)
 137                return -EINVAL;
 138
 139        len = min((size_t) 15, s);
 140        if (copy_from_user(buf, u, len))
 141                return -EFAULT;
 142
 143        buf[15] = 0;
 144
 145        for (i = 0; i < WIIPROTO_REQ_MAX; ++i) {
 146                if (!wiidebug_drmmap[i])
 147                        continue;
 148                if (!strcasecmp(buf, wiidebug_drmmap[i]))
 149                        break;
 150        }
 151
 152        if (i == WIIPROTO_REQ_MAX)
 153                i = simple_strtoul(buf, NULL, 10);
 154
 155        spin_lock_irqsave(&dbg->wdata->state.lock, flags);
 156        wiiproto_req_drm(dbg->wdata, (__u8) i);
 157        spin_unlock_irqrestore(&dbg->wdata->state.lock, flags);
 158
 159        return len;
 160}
 161
 162static const struct file_operations wiidebug_drm_fops = {
 163        .owner = THIS_MODULE,
 164        .open = wiidebug_drm_open,
 165        .read = seq_read,
 166        .llseek = seq_lseek,
 167        .write = wiidebug_drm_write,
 168        .release = single_release,
 169};
 170
 171int wiidebug_init(struct wiimote_data *wdata)
 172{
 173        struct wiimote_debug *dbg;
 174        unsigned long flags;
 175        int ret = -ENOMEM;
 176
 177        dbg = kzalloc(sizeof(*dbg), GFP_KERNEL);
 178        if (!dbg)
 179                return -ENOMEM;
 180
 181        dbg->wdata = wdata;
 182
 183        dbg->eeprom = debugfs_create_file("eeprom", S_IRUSR,
 184                dbg->wdata->hdev->debug_dir, dbg, &wiidebug_eeprom_fops);
 185        if (!dbg->eeprom)
 186                goto err;
 187
 188        dbg->drm = debugfs_create_file("drm", S_IRUSR,
 189                        dbg->wdata->hdev->debug_dir, dbg, &wiidebug_drm_fops);
 190        if (!dbg->drm)
 191                goto err_drm;
 192
 193        spin_lock_irqsave(&wdata->state.lock, flags);
 194        wdata->debug = dbg;
 195        spin_unlock_irqrestore(&wdata->state.lock, flags);
 196
 197        return 0;
 198
 199err_drm:
 200        debugfs_remove(dbg->eeprom);
 201err:
 202        kfree(dbg);
 203        return ret;
 204}
 205
 206void wiidebug_deinit(struct wiimote_data *wdata)
 207{
 208        struct wiimote_debug *dbg = wdata->debug;
 209        unsigned long flags;
 210
 211        if (!dbg)
 212                return;
 213
 214        spin_lock_irqsave(&wdata->state.lock, flags);
 215        wdata->debug = NULL;
 216        spin_unlock_irqrestore(&wdata->state.lock, flags);
 217
 218        debugfs_remove(dbg->drm);
 219        debugfs_remove(dbg->eeprom);
 220        kfree(dbg);
 221}
 222
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