/* * 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\n"); 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\n", 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); static int of_dev_node_match(struct device *dev, void *data) { return dev_archdata_get_node(&dev->archdata) == data; } /* must call put_device() when done with returned i2c_client device */ struct i2c_client *of_find_i2c_device_by_node(struct device_node *node) { struct device *dev; dev = bus_find_device(&i2c_bus_type, NULL, node, of_dev_node_match); if (!dev) return NULL; return to_i2c_client(dev); } EXPORT_SYMBOL(of_find_i2c_device_by_node); MODULE_LICENSE("GPL");