drivers/hsi/hsi_boardinfo.c

   1 /*
   2  * HSI clients registration interface
   3  *
   4  * Copyright (C) 2010 Nokia Corporation. All rights reserved.
   5  *
   6  * Contact: Carlos Chinea <carlos.chinea@nokia.com>
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * version 2 as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  20  * 02110-1301 USA
  21  */
  22 #include <linux/hsi/hsi.h>
  23 #include <linux/list.h>
  24 #include <linux/slab.h>
  25 #include "hsi_core.h"
  26
  27 /*
  28  * hsi_board_list is only used internally by the HSI framework.
  29  * No one else is allowed to make use of it.
  30  */
  31 LIST_HEAD(hsi_board_list);
  32 EXPORT_SYMBOL_GPL(hsi_board_list);
  33
  34 /**
  35  * hsi_register_board_info - Register HSI clients information
  36  * @info: Array of HSI clients on the board
  37  * @len: Length of the array
  38  *
  39  * HSI clients are statically declared and registered on board files.
  40  *
  41  * HSI clients will be automatically registered to the HSI bus once the
  42  * controller and the port where the clients wishes to attach are registered
  43  * to it.
  44  *
  45  * Return -errno on failure, 0 on success.
  46  */
  47 int __init hsi_register_board_info(struct hsi_board_info const *info,
  48                                                         unsigned int len)
  49 {
  50         struct hsi_cl_info *cl_info;
  51
  52         cl_info = kzalloc(sizeof(*cl_info) * len, GFP_KERNEL);
  53         if (!cl_info)
  54                 return -ENOMEM;
  55
  56         for (; len; len--, info++, cl_info++) {
  57                 cl_info->info = *info;
  58                 list_add_tail(&cl_info->list, &hsi_board_list);
  59         }
  60
  61         return 0;
  62 }