89 lines
2.1 KiB
C
89 lines
2.1 KiB
C
/*
|
|
* 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");
|