/*
   * OF helpers for the I2C API
   *
   * Copyright (c) 2008 Jochen Friedrich <jochen@scram.de>
   *
   * Based on a previous patch from Jon Smirl <jonsmirl@gmail.com>
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation; either version 2 of the License, or
   * (at your option) any later version.
   */
  
  #include <linux/i2c.h>
  #include <linux/of.h>

  #include <linux/of_i2c.h>

  #include <linux/module.h>

  void of_register_i2c_devices(struct i2c_adapter *adap,
  			     struct device_node *adap_node)
  {
  	void *result;
  	struct device_node *node;
  
  	for_each_child_of_node(adap_node, node) {
  		struct i2c_board_info info = {};

  		struct dev_archdata dev_ad = {};

  		const u32 *addr;
  		int len;

  		if (of_modalias_node(node, info.type, sizeof(info.type)) < 0)
  			continue;

  		addr = of_get_property(node, "reg", &len);
  		if (!addr || len < sizeof(int) || *addr > (1 << 10) - 1) {
  			printk(KERN_ERR
  			       "of-i2c: invalid i2c device entry
  ");
  			continue;
  		}
  
  		info.irq = irq_of_parse_and_map(node, 0);

  		info.addr = *addr;

  		dev_archdata_set_node(&dev_ad, node);
  		info.archdata = &dev_ad;

  		request_module("%s", info.type);

  
  		result = i2c_new_device(adap, &info);
  		if (result == NULL) {
  			printk(KERN_ERR
  			       "of-i2c: Failed to load driver for %s
  ",
  			       info.type);
  			irq_dispose_mapping(info.irq);
  			continue;
  		}

  
  		/*
  		 * Get the node to not lose the dev_archdata->of_node.
  		 * Currently there is no way to put it back, as well as no
  		 * of_unregister_i2c_devices() call.
  		 */
  		of_node_get(node);

  	}
  }
  EXPORT_SYMBOL(of_register_i2c_devices);

  
  MODULE_LICENSE("GPL");