text: /******************************************************************************
   *
   * Copyright(c) 2017 Intel Deutschland GmbH
   * Copyright (C) 2018 Intel Corporation
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   *  * Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   *  * Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in
   *    the documentation and/or other materials provided with the
   *    distribution.
   *  * Neither the name Intel Corporation nor the names of its
   *    contributors may be used to endorse or promote products derived
   *    from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   *
   *****************************************************************************/
  
  #include "fw/dbg.h"
  #include "xvt.h"
  
  #define XVT_DEBUGFS_WRITE_WRAPPER(name, buflen, argtype)                                   \
    static ssize_t _iwl_dbgfs_##name##_write(struct file* file, const char __user* user_buf, \
                                             size_t count, loff_t* ppos) {                   \
      argtype* arg = file->private_data;                                                     \
      char buf[buflen] = {};                                                                 \
      size_t buf_size = min(count, sizeof(buf) - 1);                                         \
                                                                                             \
      if (copy_from_user(buf, user_buf, buf_size))                                           \
        return -EFAULT;                                                                      \
                                                                                             \
      return iwl_dbgfs_##name##_write(arg, buf, buf_size, ppos);                             \
    }
  
  #define _XVT_DEBUGFS_WRITE_FILE_OPS(name, buflen, argtype)       \
    XVT_DEBUGFS_WRITE_WRAPPER(name, buflen, argtype)               \
    static const struct file_operations iwl_dbgfs_##name##_ops = { \
        .write = _iwl_dbgfs_##name##_write,                        \
        .open = simple_open,                                       \
        .llseek = generic_file_llseek,                             \
    }
  
  #define XVT_DEBUGFS_WRITE_FILE_OPS(name, bufsz) \
    _XVT_DEBUGFS_WRITE_FILE_OPS(name, bufsz, struct iwl_xvt)
  
  #define XVT_DEBUGFS_ADD_FILE_ALIAS(alias, name, parent, mode)                    \
    do {                                                                           \
      if (!debugfs_create_file(alias, mode, parent, xvt, &iwl_dbgfs_##name##_ops)) \
        goto err;                                                                  \
    } while (0)
  
  #define XVT_DEBUGFS_ADD_FILE(name, parent, mode) \
    XVT_DEBUGFS_ADD_FILE_ALIAS(#name, name, parent, mode)
  
  static ssize_t iwl_dbgfs_fw_dbg_collect_write(struct iwl_xvt* xvt, char* buf, size_t count,
                                                loff_t* ppos) {
    if (!(xvt->state == IWL_XVT_STATE_OPERATIONAL && xvt->fw_running)) {
      return -EIO;
    }
  
    if (count == 0) {
      return 0;
    }
  
    iwl_fw_dbg_collect(&xvt->fwrt, FW_DBG_TRIGGER_USER, buf, (count - 1));
  
    return count;
  }
  
  static ssize_t iwl_dbgfs_fw_restart_write(struct iwl_xvt* xvt, char* buf, size_t count,
                                            loff_t* ppos) {
    int __maybe_unused ret;
  
    if (!xvt->fw_running) {
      return -EIO;
    }
  
    mutex_lock(&xvt->mutex);
  
    /* Take the return value, though failure is expected, for compilation */
    ret = iwl_xvt_send_cmd_pdu(xvt, REPLY_ERROR, 0, 0, NULL);
  
    mutex_unlock(&xvt->mutex);
  
    return count;
  }
  
  /* Device wide debugfs entries */
  XVT_DEBUGFS_WRITE_FILE_OPS(fw_dbg_collect, 64);
  XVT_DEBUGFS_WRITE_FILE_OPS(fw_restart, 10);
  
  #ifdef CPTCFG_IWLWIFI_DEBUGFS
  int iwl_xvt_dbgfs_register(struct iwl_xvt* xvt, struct dentry* dbgfs_dir) {
    xvt->debugfs_dir = dbgfs_dir;
  
    XVT_DEBUGFS_ADD_FILE(fw_dbg_collect, xvt->debugfs_dir, S_IWUSR);
    XVT_DEBUGFS_ADD_FILE(fw_restart, xvt->debugfs_dir, S_IWUSR);
  
    return 0;
  err:
    IWL_ERR(xvt, "Can't create the xvt debugfs directory\n");
    return -ENOMEM;
  }
  #endif /* CPTCFG_IWLWIFI_DEBUGFS */
  