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 int wiidebug_eeprom_open(struct inode *i, struct file *f)
  27 {
  28         f->private_data = i->i_private;
  29         return 0;
  30 }
  31
  32 static ssize_t wiidebug_eeprom_read(struct file *f, char __user *u, size_t s,
  33                                                                 loff_t *off)
  34 {
  35         struct wiimote_debug *dbg = f->private_data;
  36         struct wiimote_data *wdata = dbg->wdata;
  37         unsigned long flags;
  38         ssize_t ret;
  39         char buf[16];
  40         __u16 size;
  41
  42         if (s == 0)
  43                 return -EINVAL;
  44         if (*off > 0xffffff)
  45                 return 0;
  46         if (s > 16)
  47                 s = 16;
  48
  49         ret = wiimote_cmd_acquire(wdata);
  50         if (ret)
  51                 return ret;
  52
  53         spin_lock_irqsave(&wdata->state.lock, flags);
  54         wdata->state.cmd_read_size = s;
  55         wdata->state.cmd_read_buf = buf;
  56         wiimote_cmd_set(wdata, WIIPROTO_REQ_RMEM, *off & 0xffff);
  57         wiiproto_req_reeprom(wdata, *off, s);
  58         spin_unlock_irqrestore(&wdata->state.lock, flags);
  59
  60         ret = wiimote_cmd_wait(wdata);
  61         if (!ret)
  62                 size = wdata->state.cmd_read_size;
  63
  64         spin_lock_irqsave(&wdata->state.lock, flags);
  65         wdata->state.cmd_read_buf = NULL;
  66         spin_unlock_irqrestore(&wdata->state.lock, flags);
  67
  68         wiimote_cmd_release(wdata);
  69
  70         if (ret)
  71                 return ret;
  72         else if (size == 0)
  73                 return -EIO;
  74
  75         if (copy_to_user(u, buf, size))
  76                 return -EFAULT;
  77
  78         *off += size;
  79         ret = size;
  80
  81         return ret;
  82 }
  83
  84 static const struct file_operations wiidebug_eeprom_fops = {
  85         .owner = THIS_MODULE,
  86         .open = wiidebug_eeprom_open,
  87         .read = wiidebug_eeprom_read,
  88         .llseek = generic_file_llseek,
  89 };
  90
  91 static const char *wiidebug_drmmap[] = {
  92         [WIIPROTO_REQ_NULL] = "NULL",
  93         [WIIPROTO_REQ_DRM_K] = "K",
  94         [WIIPROTO_REQ_DRM_KA] = "KA",
  95         [WIIPROTO_REQ_DRM_KE] = "KE",
  96         [WIIPROTO_REQ_DRM_KAI] = "KAI",
  97         [WIIPROTO_REQ_DRM_KEE] = "KEE",
  98         [WIIPROTO_REQ_DRM_KAE] = "KAE",
  99         [WIIPROTO_REQ_DRM_KIE] = "KIE",
 100         [WIIPROTO_REQ_DRM_KAIE] = "KAIE",
 101         [WIIPROTO_REQ_DRM_E] = "E",
 102         [WIIPROTO_REQ_DRM_SKAI1] = "SKAI1",
 103         [WIIPROTO_REQ_DRM_SKAI2] = "SKAI2",
 104         [WIIPROTO_REQ_MAX] = NULL
 105 };
 106
 107 static int wiidebug_drm_show(struct seq_file *f, void *p)
 108 {
 109         struct wiimote_debug *dbg = f->private;
 110         const char *str = NULL;
 111         unsigned long flags;
 112         __u8 drm;
 113
 114         spin_lock_irqsave(&dbg->wdata->state.lock, flags);
 115         drm = dbg->wdata->state.drm;
 116         spin_unlock_irqrestore(&dbg->wdata->state.lock, flags);
 117
 118         if (drm < WIIPROTO_REQ_MAX)
 119                 str = wiidebug_drmmap[drm];
 120         if (!str)
 121                 str = "unknown";
 122
 123         seq_printf(f, "%s\n", str);
 124
 125         return 0;
 126 }
 127
 128 static int wiidebug_drm_open(struct inode *i, struct file *f)
 129 {
 130         return single_open(f, wiidebug_drm_show, i->i_private);
 131 }
 132
 133 static ssize_t wiidebug_drm_write(struct file *f, const char __user *u,
 134                                                         size_t s, loff_t *off)
 135 {
 136         struct wiimote_debug *dbg = f->private_data;
 137         unsigned long flags;
 138         char buf[16];
 139         ssize_t len;
 140         int i;
 141
 142         if (s == 0)
 143                 return -EINVAL;
 144
 145         len = min((size_t) 15, s);
 146         if (copy_from_user(buf, u, len))
 147                 return -EFAULT;
 148
 149         buf[15] = 0;
 150
 151         for (i = 0; i < WIIPROTO_REQ_MAX; ++i) {
 152                 if (!wiidebug_drmmap[i])
 153                         continue;
 154                 if (!strcasecmp(buf, wiidebug_drmmap[i]))
 155                         break;
 156         }
 157
 158         if (i == WIIPROTO_REQ_MAX)
 159                 i = simple_strtoul(buf, NULL, 10);
 160
 161         spin_lock_irqsave(&dbg->wdata->state.lock, flags);
 162         wiiproto_req_drm(dbg->wdata, (__u8) i);
 163         spin_unlock_irqrestore(&dbg->wdata->state.lock, flags);
 164
 165         return len;
 166 }
 167
 168 static const struct file_operations wiidebug_drm_fops = {
 169         .owner = THIS_MODULE,
 170         .open = wiidebug_drm_open,
 171         .read = seq_read,
 172         .llseek = seq_lseek,
 173         .write = wiidebug_drm_write,
 174         .release = single_release,
 175 };
 176
 177 int wiidebug_init(struct wiimote_data *wdata)
 178 {
 179         struct wiimote_debug *dbg;
 180         unsigned long flags;
 181         int ret = -ENOMEM;
 182
 183         dbg = kzalloc(sizeof(*dbg), GFP_KERNEL);
 184         if (!dbg)
 185                 return -ENOMEM;
 186
 187         dbg->wdata = wdata;
 188
 189         dbg->eeprom = debugfs_create_file("eeprom", S_IRUSR,
 190                 dbg->wdata->hdev->debug_dir, dbg, &wiidebug_eeprom_fops);
 191         if (!dbg->eeprom)
 192                 goto err;
 193
 194         dbg->drm = debugfs_create_file("drm", S_IRUSR,
 195                         dbg->wdata->hdev->debug_dir, dbg, &wiidebug_drm_fops);
 196         if (!dbg->drm)
 197                 goto err_drm;
 198
 199         spin_lock_irqsave(&wdata->state.lock, flags);
 200         wdata->debug = dbg;
 201         spin_unlock_irqrestore(&wdata->state.lock, flags);
 202
 203         return 0;
 204
 205 err_drm:
 206         debugfs_remove(dbg->eeprom);
 207 err:
 208         kfree(dbg);
 209         return ret;
 210 }
 211
 212 void wiidebug_deinit(struct wiimote_data *wdata)
 213 {
 214         struct wiimote_debug *dbg = wdata->debug;
 215         unsigned long flags;
 216
 217         if (!dbg)
 218                 return;
 219
 220         spin_lock_irqsave(&wdata->state.lock, flags);
 221         wdata->debug = NULL;
 222         spin_unlock_irqrestore(&wdata->state.lock, flags);
 223
 224         debugfs_remove(dbg->drm);
 225         debugfs_remove(dbg->eeprom);
 226         kfree(dbg);
 227 }