drivers/hid/hid-wiimote-debug.c

   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
  20 struct wiimote_debug {
  21         struct wiimote_data *wdata;
  22         struct dentry *eeprom;
  23         struct dentry *drm;
  24 };
  25
  26 static 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
  78 static 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
  85 static 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
 101 static 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
 122 static int wiidebug_drm_open(struct inode *i, struct file *f)
 123 {
 124         return single_open(f, wiidebug_drm_show, i->i_private);
 125 }
 126
 127 static 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
 162 static 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
 171 int 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
 199 err_drm:
 200         debugfs_remove(dbg->eeprom);
 201 err:
 202         kfree(dbg);
 203         return ret;
 204 }
 205
 206 void 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 }