128 lines
3.2 KiB
C
128 lines
3.2 KiB
C
/***************************************************
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* File:kernelFwUpdate.c
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*
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* Copyright (c) 2008- 2030 oplus Mobile communication Corp.ltd.
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* Description:
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* kernelFwUpdate
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* Version:1.0:
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* Date created:2020/07/20
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* TAG: BSP.TP.Init
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/firmware.h>
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#include <linux/types.h>
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#include <linux/device.h>
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#include <linux/kdev_t.h>
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#include <linux/major.h>
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#include <linux/version.h>
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#include "kernelFwUpdate.h"
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#define FW_UPDATE_DEVICE "kernelFwUpdate"
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#define MAX_FW_NAME 256
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#define FW_UPDATE_INFO(a, arg...) pr_err("[FW_UPDATE]"FW_UPDATE_DEVICE ": " a, ##arg)
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struct device *fw_update_dev = NULL;
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static ssize_t debug_level(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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FW_UPDATE_INFO("%s enter\n", __func__);
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return count;
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}
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static DEVICE_ATTR(debug_level, S_IRUGO | S_IWUSR, NULL, debug_level);
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static const struct attribute *fw_update_attr[] = {
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&dev_attr_debug_level.attr,
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NULL,
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};
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static const struct attribute_group fw_update_attr_group = {
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.attrs = (struct attribute **) fw_update_attr,
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};
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static struct class kernel_fw_update_class = {
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.name = "kernel_fw_update",
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#if LINUX_VERSION_CODE < KERNEL_VERSION(6, 6, 0)
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.owner = THIS_MODULE,
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#endif
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};
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static void fw_update_uevent_env(const char *name)
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{
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char *envp[2] = {NULL, NULL};
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char fw_name[MAX_FW_NAME] = {0};
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snprintf(fw_name, MAX_FW_NAME, "FIRMWARE=%s", name);
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envp[0] = fw_name;
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kobject_uevent_env(&fw_update_dev->kobj, KOBJ_CHANGE, envp);
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FW_UPDATE_INFO("%s envp[0]:%s\n", __func__, envp[0]);
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return;
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}
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int request_firmware_select(const struct firmware **firmware_p, const char *name,
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struct device *device)
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{
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int ret = 0;
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fw_update_uevent_env(name);
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ret = request_firmware(firmware_p, name, device);
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return ret;
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}
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EXPORT_SYMBOL(request_firmware_select);
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static int __init kernel_fw_update_init(void)
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{
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int ret = 0;
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FW_UPDATE_INFO("%s enter\n", __func__);
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ret = class_register(&kernel_fw_update_class);
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if (ret < 0) {
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FW_UPDATE_INFO("kernel_fw_update: class_register fail\n");
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return 0;
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}
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fw_update_dev = device_create(&kernel_fw_update_class, NULL,
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MKDEV(0, 0), NULL, "kernel_fw_update");
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if (fw_update_dev) {
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ret = sysfs_create_group(&fw_update_dev->kobj, &fw_update_attr_group);
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if(ret < 0) {
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FW_UPDATE_INFO("kernel_fw_update:sysfs_create_group fail\n");
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goto out_class;
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}
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} else {
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FW_UPDATE_INFO("kernel_fw_update:device_create fail\n");
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goto out_class;
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}
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return 0;
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out_class:
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class_unregister(&kernel_fw_update_class);
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return 0;
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}
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static void __exit kernel_fw_update_exit(void)
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{
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if (fw_update_dev) {
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sysfs_remove_group(&fw_update_dev->kobj, &fw_update_attr_group);
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class_unregister(&kernel_fw_update_class);
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}
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}
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fs_initcall(kernel_fw_update_init);
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module_exit(kernel_fw_update_exit);
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MODULE_AUTHOR("Qicai.gu");
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MODULE_DESCRIPTION("oplus kernel firmware loading support");
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MODULE_LICENSE("GPL");
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