88 lines
2.2 KiB
C
88 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2022-2023, Qualcomm Innovation Center, Inc. All rights reserved.
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/mount.h>
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#include <linux/genhd.h>
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#include <linux/device.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/netdevice.h>
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#include <linux/rtnetlink.h>
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#include <linux/blkdev.h>
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#define PATH_SIZE 64
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static void rename_blk_device_name(struct device_node *np)
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{
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dev_t devt;
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int index = 0;
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struct device_node *node = np;
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char dev_path[PATH_SIZE];
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const char *actual_name;
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char *modified_name;
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struct device *dev;
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struct block_device *bdev;
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while (!of_property_read_string_index(node, "actual-dev", index,
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&actual_name)) {
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memset(dev_path, '\0', PATH_SIZE);
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snprintf(dev_path, PATH_SIZE, "/dev/%s", actual_name);
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devt = name_to_dev_t(dev_path);
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if (!devt) {
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pr_err("rename-devices: No device path : %s\n", dev_path);
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return;
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}
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bdev = blkdev_get_by_dev(devt, FMODE_WRITE | FMODE_READ, NULL);
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dev = &bdev->bd_device;
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if (!dev) {
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pr_err("rename-devices: No device with dev path : %s\n", dev_path);
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return;
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}
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if (!of_property_read_string_index(node, "rename-dev", index,
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(const char **)&modified_name)) {
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device_rename(dev, modified_name);
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} else {
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pr_err("rename-devices: rename-dev for actual-dev = %s is missing\n",
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actual_name);
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return;
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}
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index++;
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}
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}
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static int __init rename_devices_init(void)
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{
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struct device_node *node = NULL, *child = NULL;
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const char *device_type;
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node = of_find_compatible_node(NULL, NULL, "qcom,rename-devices");
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if (!node) {
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pr_err("rename-devices: qcom,rename-devices node is missing\n");
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goto out;
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}
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for_each_child_of_node(node, child) {
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if (!of_property_read_string(child, "device-type", &device_type)) {
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if (strcmp(device_type, "block") == 0)
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rename_blk_device_name(child);
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else
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pr_err("rename-devices: unsupported device\n");
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} else
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pr_err("rename-devices: device-type is missing\n");
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}
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out:
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of_node_put(node);
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return 0;
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}
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late_initcall(rename_devices_init);
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MODULE_DESCRIPTION("Rename devices");
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MODULE_LICENSE("GPL v2");
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MODULE_SOFTDEP("pre: virtio_blk");
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MODULE_SOFTDEP("pre: virtio_mmio");
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