128 lines
2.8 KiB
C
128 lines
2.8 KiB
C
/*
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* Copyright (C) 2013 Sascha Hauer <s.hauer@pengutronix.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <common.h>
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#include <driver.h>
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#include <init.h>
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#include <malloc.h>
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#include <of.h>
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#include <state.h>
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#include <linux/err.h>
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static int state_probe(struct device_d *dev)
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{
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struct device_node *np = dev->device_node;
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struct device_node *partition_node;
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struct state *state;
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const char *alias;
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const char *backend_type = NULL;
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int ret;
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const char *of_path;
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char *path;
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if (!np)
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return -EINVAL;
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alias = of_alias_get(np);
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if (!alias)
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alias = "state";
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state = state_new_from_node(alias, np);
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if (IS_ERR(state))
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return PTR_ERR(state);
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of_path = of_get_property(np, "backend", NULL);
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if (!of_path) {
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ret = -ENODEV;
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goto out_release;
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}
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/* guess if of_path is a path, not a phandle */
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if (of_path[0] == '/') {
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ret = of_find_path(np, "backend", &path);
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if (ret == -ENODEV)
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ret = -EPROBE_DEFER;
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if (ret)
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goto out_release;
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} else {
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struct device_d *dev;
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struct cdev *cdev;
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partition_node = of_parse_phandle(np, "backend", 0);
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if (!partition_node) {
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ret = -ENODEV;
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goto out_release;
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}
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dev = of_find_device_by_node(partition_node);
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if (!list_is_singular(&dev->cdevs)) {
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ret = -EPROBE_DEFER;
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goto out_release;
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}
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cdev = list_first_entry(&dev->cdevs, struct cdev, devices_list);
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if (!cdev) {
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ret = -ENODEV;
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goto out_release;
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}
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path = asprintf("/dev/%s", cdev->name);
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of_path = partition_node->full_name;
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}
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ret = of_property_read_string(np, "backend-type", &backend_type);
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if (ret) {
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goto out_free;
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} else if (!strcmp(backend_type, "raw")) {
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ret = state_backend_raw_file(state, of_path, path, 0, 0);
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} else if (!strcmp(backend_type, "dtb")) {
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ret = state_backend_dtb_file(state, of_path, path);
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} else {
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dev_warn(dev, "invalid backend type: %s\n", backend_type);
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ret = -ENODEV;
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goto out_free;
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}
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if (ret)
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goto out_free;
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dev_info(dev, "backend: %s, path: %s, of_path: %s\n", backend_type, path, of_path);
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free(path);
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state_load(state);
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return 0;
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out_free:
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free(path);
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out_release:
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state_release(state);
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return ret;
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}
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static __maybe_unused struct of_device_id state_ids[] = {
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{
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.compatible = "barebox,state",
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}, {
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/* sentinel */
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}
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};
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static struct driver_d state_driver = {
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.name = "state",
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.probe = state_probe,
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.of_compatible = DRV_OF_COMPAT(state_ids),
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};
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device_platform_driver(state_driver);
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