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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145// SPDX-License-Identifier: GPL-2.0-only/* * ec_sys.c * * Copyright (C) 2010 SUSE Products GmbH/Novell * Author: * Thomas Renninger <trenn@suse.de> */
#include <linux/kernel.h>#include <linux/acpi.h>#include <linux/debugfs.h>#include <linux/module.h>#include <linux/uaccess.h>#include "internal.h"
MODULE_AUTHOR("Thomas Renninger <trenn@suse.de>");MODULE_DESCRIPTION("ACPI EC sysfs access driver");MODULE_LICENSE("GPL");
static bool write_support;module_param_hw(write_support, bool, other, 0644);MODULE_PARM_DESC(write_support, "Dangerous, reboot and removal of battery may " "be needed.");
#define EC_SPACE_SIZE 256
static struct dentry *acpi_ec_debugfs_dir;
static ssize_t acpi_ec_read_io(struct file *f, char __user *buf, size_t count, loff_t *off){ /* Use this if support reading/writing multiple ECs exists in ec.c: * struct acpi_ec *ec = ((struct seq_file *)f->private_data)->private; */ unsigned int size = EC_SPACE_SIZE; loff_t init_off = *off; int err = 0;
if (*off >= size) return 0; if (*off + count >= size) { size -= *off; count = size; } else size = count;
while (size) { u8 byte_read; err = ec_read(*off, &byte_read); if (err) return err; if (put_user(byte_read, buf + *off - init_off)) { if (*off - init_off) return *off - init_off; /* partial read */ return -EFAULT; } *off += 1; size--; } return count;}
static ssize_t acpi_ec_write_io(struct file *f, const char __user *buf, size_t count, loff_t *off){ /* Use this if support reading/writing multiple ECs exists in ec.c: * struct acpi_ec *ec = ((struct seq_file *)f->private_data)->private; */
unsigned int size = count; loff_t init_off = *off; int err = 0;
if (!write_support) return -EINVAL;
if (*off >= EC_SPACE_SIZE) return 0; if (*off + count >= EC_SPACE_SIZE) { size = EC_SPACE_SIZE - *off; count = size; }
while (size) { u8 byte_write; if (get_user(byte_write, buf + *off - init_off)) { if (*off - init_off) return *off - init_off; /* partial write */ return -EFAULT; } err = ec_write(*off, byte_write); if (err) return err;
*off += 1; size--; } return count;}
static const struct file_operations acpi_ec_io_ops = { .owner = THIS_MODULE, .open = simple_open, .read = acpi_ec_read_io, .write = acpi_ec_write_io, .llseek = default_llseek,};
static void acpi_ec_add_debugfs(struct acpi_ec *ec, unsigned int ec_device_count){ struct dentry *dev_dir; char name[64]; umode_t mode = 0400;
if (ec_device_count == 0) acpi_ec_debugfs_dir = debugfs_create_dir("ec", NULL);
sprintf(name, "ec%u", ec_device_count); dev_dir = debugfs_create_dir(name, acpi_ec_debugfs_dir);
debugfs_create_x32("gpe", 0444, dev_dir, &first_ec->gpe); debugfs_create_bool("use_global_lock", 0444, dev_dir, &first_ec->global_lock);
if (write_support) mode = 0600; debugfs_create_file("io", mode, dev_dir, ec, &acpi_ec_io_ops);}
static int __init acpi_ec_sys_init(void){ if (first_ec) acpi_ec_add_debugfs(first_ec, 0); return 0;}
static void __exit acpi_ec_sys_exit(void){ debugfs_remove_recursive(acpi_ec_debugfs_dir);}
module_init(acpi_ec_sys_init);module_exit(acpi_ec_sys_exit);