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/*
* Copyright (C) 2013 Sascha Hauer <s.hauer@pengutronix.de>
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <common.h>
#include <driver.h>
#include <init.h>
#include <malloc.h>
#include <of.h>
#include <state.h>
#include <linux/err.h>
static int state_probe(struct device_d *dev)
{
struct device_node *np = dev->device_node;
struct device_node *partition_node;
struct state *state;
const char *alias;
const char *backend_type = NULL;
int len, ret;
const char *of_path;
char *path;
if (!np)
return -EINVAL;
alias = of_alias_get(np);
if (!alias)
alias = "state";
state = state_new_from_node(alias, np);
if (IS_ERR(state))
return PTR_ERR(state);
of_path = of_get_property(np, "backend", &len);
if (!of_path) {
ret = -ENODEV;
goto out_release;
}
/* guess if of_path is a path, not a phandle */
if (of_path[0] == '/' && len > 1) {
ret = of_find_path(np, "backend", &path, 0);
if (ret)
goto out_release;
} else {
struct device_d *dev;
struct cdev *cdev;
partition_node = of_parse_phandle(np, "backend", 0);
if (!partition_node) {
ret = -ENODEV;
goto out_release;
}
dev = of_find_device_by_node(partition_node);
if (!list_is_singular(&dev->cdevs)) {
ret = -ENODEV;
goto out_release;
}
cdev = list_first_entry(&dev->cdevs, struct cdev, devices_list);
if (!cdev) {
ret = -ENODEV;
goto out_release;
}
path = asprintf("/dev/%s", cdev->name);
of_path = partition_node->full_name;
}
ret = of_property_read_string(np, "backend-type", &backend_type);
if (ret) {
goto out_free;
} else if (!strcmp(backend_type, "raw")) {
ret = state_backend_raw_file(state, of_path, path, 0, 0);
} else if (!strcmp(backend_type, "dtb")) {
ret = state_backend_dtb_file(state, of_path, path);
} else {
dev_warn(dev, "invalid backend type: %s\n", backend_type);
ret = -ENODEV;
goto out_free;
}
if (ret)
goto out_free;
dev_info(dev, "backend: %s, path: %s, of_path: %s\n", backend_type, path, of_path);
free(path);
state_load(state);
return 0;
out_free:
free(path);
out_release:
state_release(state);
return ret;
}
static __maybe_unused struct of_device_id state_ids[] = {
{
.compatible = "barebox,state",
}, {
/* sentinel */
}
};
static struct driver_d state_driver = {
.name = "state",
.probe = state_probe,
.of_compatible = DRV_OF_COMPAT(state_ids),
};
device_platform_driver(state_driver);
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