threeeye
bc1d038eac
Squashed backup commit (no shallow-clone history issues) of xiaomi-mt6833-dev/kernel_xiaomi_mt6833 (lineage-23.2 branch, upstream commit 9eece662e) plus all fixes applied to get everpal_defconfig building clean against a modern (GCC 15.2.0) toolchain -- see the previous commit message on the lineage-23.2 branch (also in this repo history is not available here since this is a squashed snapshot; full incremental history lives in the local DL380 checkout and the upstream GitHub remote). Upstream: https://github.com/xiaomi-mt6833-dev/kernel_xiaomi_mt6833 (lineage-23.2)
106 lines
2.2 KiB
C
106 lines
2.2 KiB
C
/*
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* custom_method.c - debugfs interface for customizing ACPI control method
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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/kernel.h>
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#include <linux/uaccess.h>
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#include <linux/debugfs.h>
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#include <linux/acpi.h>
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#include "internal.h"
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#define _COMPONENT ACPI_SYSTEM_COMPONENT
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ACPI_MODULE_NAME("custom_method");
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MODULE_LICENSE("GPL");
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static struct dentry *cm_dentry;
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/* /sys/kernel/debug/acpi/custom_method */
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static ssize_t cm_write(struct file *file, const char __user * user_buf,
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size_t count, loff_t *ppos)
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{
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static char *buf;
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static u32 max_size;
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static u32 uncopied_bytes;
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struct acpi_table_header table;
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acpi_status status;
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if (!(*ppos)) {
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/* parse the table header to get the table length */
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if (count <= sizeof(struct acpi_table_header))
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return -EINVAL;
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if (copy_from_user(&table, user_buf,
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sizeof(struct acpi_table_header)))
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return -EFAULT;
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uncopied_bytes = max_size = table.length;
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/* make sure the buf is not allocated */
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kfree(buf);
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buf = kzalloc(max_size, GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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}
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if (buf == NULL)
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return -EINVAL;
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if ((*ppos > max_size) ||
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(*ppos + count > max_size) ||
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(*ppos + count < count) ||
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(count > uncopied_bytes)) {
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kfree(buf);
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buf = NULL;
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return -EINVAL;
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}
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if (copy_from_user(buf + (*ppos), user_buf, count)) {
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kfree(buf);
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buf = NULL;
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return -EFAULT;
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}
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uncopied_bytes -= count;
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*ppos += count;
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if (!uncopied_bytes) {
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status = acpi_install_method(buf);
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kfree(buf);
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buf = NULL;
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if (ACPI_FAILURE(status))
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return -EINVAL;
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add_taint(TAINT_OVERRIDDEN_ACPI_TABLE, LOCKDEP_NOW_UNRELIABLE);
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}
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return count;
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}
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static const struct file_operations cm_fops = {
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.write = cm_write,
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.llseek = default_llseek,
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};
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static int __init acpi_custom_method_init(void)
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{
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if (acpi_debugfs_dir == NULL)
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return -ENOENT;
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cm_dentry = debugfs_create_file("custom_method", S_IWUSR,
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acpi_debugfs_dir, NULL, &cm_fops);
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if (cm_dentry == NULL)
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return -ENODEV;
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return 0;
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}
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static void __exit acpi_custom_method_exit(void)
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{
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if (cm_dentry)
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debugfs_remove(cm_dentry);
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}
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module_init(acpi_custom_method_init);
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module_exit(acpi_custom_method_exit);
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