LXR linux/drivers/of/of

   1/*
   2 * OF helpers for the I2C API
   3 *
   4 * Copyright (c) 2008 Jochen Friedrich <jochen@scram.de>
   5 *
   6 * Based on a previous patch from Jon Smirl <jonsmirl@gmail.com>
   7 *
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License as published by
  10 * the Free Software Foundation; either version 2 of the License, or
  11 * (at your option) any later version.
  12 */
  13
  14#include <linux/i2c.h>
  15#include <linux/of.h>
  16#include <linux/of_i2c.h>
  17#include <linux/module.h>
  18
  19void of_register_i2c_devices(struct i2c_adapter *adap,
  20                             struct device_node *adap_node)
  21{
  22        void *result;
  23        struct device_node *node;
  24
  25        for_each_child_of_node(adap_node, node) {
  26                struct i2c_board_info info = {};
  27                const u32 *addr;
  28                int len;
  29
  30                if (of_modalias_node(node, info.type, sizeof(info.type)) < 0)
  31                        continue;
  32
  33                addr = of_get_property(node, "reg", &len);
  34                if (!addr || len < sizeof(int) || *addr > (1 << 10) - 1) {
  35                        printk(KERN_ERR
  36                               "of-i2c: invalid i2c device entry\n");
  37                        continue;
  38                }
  39
  40                info.irq = irq_of_parse_and_map(node, 0);
  41
  42                info.addr = *addr;
  43
  44                request_module(info.type);
  45
  46                result = i2c_new_device(adap, &info);
  47                if (result == NULL) {
  48                        printk(KERN_ERR
  49                               "of-i2c: Failed to load driver for %s\n",
  50                               info.type);
  51                        irq_dispose_mapping(info.irq);
  52                        continue;
  53                }
  54        }
  55}
  56EXPORT_SYMBOL(of_register_i2c_devices);
  57
  58MODULE_LICENSE("GPL");
  59