mirror of
https://github.com/AetherDroid/android_kernel_samsung_on5xelte.git
synced 2025-09-08 17:18:05 -04:00
Fixed MTP to work with TWRP
This commit is contained in:
awab228
commit
f6dfaef42e
50820 changed files with 20846062 additions and 0 deletions
271
drivers/watchdog/scx200_wdt.c
Normal file
271
drivers/watchdog/scx200_wdt.c
Normal file
|
|
@ -0,0 +1,271 @@
|
|||
/* drivers/char/watchdog/scx200_wdt.c
|
||||
|
||||
National Semiconductor SCx200 Watchdog support
|
||||
|
||||
Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com>
|
||||
|
||||
Some code taken from:
|
||||
National Semiconductor PC87307/PC97307 (ala SC1200) WDT driver
|
||||
(c) Copyright 2002 Zwane Mwaikambo <zwane@commfireservices.com>
|
||||
|
||||
This program is free software; you can redistribute it and/or
|
||||
modify it under the terms of the GNU General Public License as
|
||||
published by the Free Software Foundation; either version 2 of the
|
||||
License, or (at your option) any later version.
|
||||
|
||||
The author(s) of this software shall not be held liable for damages
|
||||
of any nature resulting due to the use of this software. This
|
||||
software is provided AS-IS with no warranties. */
|
||||
|
||||
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
||||
|
||||
#include <linux/module.h>
|
||||
#include <linux/moduleparam.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/miscdevice.h>
|
||||
#include <linux/watchdog.h>
|
||||
#include <linux/notifier.h>
|
||||
#include <linux/reboot.h>
|
||||
#include <linux/fs.h>
|
||||
#include <linux/ioport.h>
|
||||
#include <linux/scx200.h>
|
||||
#include <linux/uaccess.h>
|
||||
#include <linux/io.h>
|
||||
|
||||
#define DEBUG
|
||||
|
||||
MODULE_AUTHOR("Christer Weinigel <wingel@nano-system.com>");
|
||||
MODULE_DESCRIPTION("NatSemi SCx200 Watchdog Driver");
|
||||
MODULE_LICENSE("GPL");
|
||||
|
||||
static int margin = 60; /* in seconds */
|
||||
module_param(margin, int, 0);
|
||||
MODULE_PARM_DESC(margin, "Watchdog margin in seconds");
|
||||
|
||||
static bool nowayout = WATCHDOG_NOWAYOUT;
|
||||
module_param(nowayout, bool, 0);
|
||||
MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close");
|
||||
|
||||
static u16 wdto_restart;
|
||||
static char expect_close;
|
||||
static unsigned long open_lock;
|
||||
static DEFINE_SPINLOCK(scx_lock);
|
||||
|
||||
/* Bits of the WDCNFG register */
|
||||
#define W_ENABLE 0x00fa /* Enable watchdog */
|
||||
#define W_DISABLE 0x0000 /* Disable watchdog */
|
||||
|
||||
/* The scaling factor for the timer, this depends on the value of W_ENABLE */
|
||||
#define W_SCALE (32768/1024)
|
||||
|
||||
static void scx200_wdt_ping(void)
|
||||
{
|
||||
spin_lock(&scx_lock);
|
||||
outw(wdto_restart, scx200_cb_base + SCx200_WDT_WDTO);
|
||||
spin_unlock(&scx_lock);
|
||||
}
|
||||
|
||||
static void scx200_wdt_update_margin(void)
|
||||
{
|
||||
pr_info("timer margin %d seconds\n", margin);
|
||||
wdto_restart = margin * W_SCALE;
|
||||
}
|
||||
|
||||
static void scx200_wdt_enable(void)
|
||||
{
|
||||
pr_debug("enabling watchdog timer, wdto_restart = %d\n", wdto_restart);
|
||||
|
||||
spin_lock(&scx_lock);
|
||||
outw(0, scx200_cb_base + SCx200_WDT_WDTO);
|
||||
outb(SCx200_WDT_WDSTS_WDOVF, scx200_cb_base + SCx200_WDT_WDSTS);
|
||||
outw(W_ENABLE, scx200_cb_base + SCx200_WDT_WDCNFG);
|
||||
spin_unlock(&scx_lock);
|
||||
|
||||
scx200_wdt_ping();
|
||||
}
|
||||
|
||||
static void scx200_wdt_disable(void)
|
||||
{
|
||||
pr_debug("disabling watchdog timer\n");
|
||||
|
||||
spin_lock(&scx_lock);
|
||||
outw(0, scx200_cb_base + SCx200_WDT_WDTO);
|
||||
outb(SCx200_WDT_WDSTS_WDOVF, scx200_cb_base + SCx200_WDT_WDSTS);
|
||||
outw(W_DISABLE, scx200_cb_base + SCx200_WDT_WDCNFG);
|
||||
spin_unlock(&scx_lock);
|
||||
}
|
||||
|
||||
static int scx200_wdt_open(struct inode *inode, struct file *file)
|
||||
{
|
||||
/* only allow one at a time */
|
||||
if (test_and_set_bit(0, &open_lock))
|
||||
return -EBUSY;
|
||||
scx200_wdt_enable();
|
||||
|
||||
return nonseekable_open(inode, file);
|
||||
}
|
||||
|
||||
static int scx200_wdt_release(struct inode *inode, struct file *file)
|
||||
{
|
||||
if (expect_close != 42)
|
||||
pr_warn("watchdog device closed unexpectedly, will not disable the watchdog timer\n");
|
||||
else if (!nowayout)
|
||||
scx200_wdt_disable();
|
||||
expect_close = 0;
|
||||
clear_bit(0, &open_lock);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int scx200_wdt_notify_sys(struct notifier_block *this,
|
||||
unsigned long code, void *unused)
|
||||
{
|
||||
if (code == SYS_HALT || code == SYS_POWER_OFF)
|
||||
if (!nowayout)
|
||||
scx200_wdt_disable();
|
||||
|
||||
return NOTIFY_DONE;
|
||||
}
|
||||
|
||||
static struct notifier_block scx200_wdt_notifier = {
|
||||
.notifier_call = scx200_wdt_notify_sys,
|
||||
};
|
||||
|
||||
static ssize_t scx200_wdt_write(struct file *file, const char __user *data,
|
||||
size_t len, loff_t *ppos)
|
||||
{
|
||||
/* check for a magic close character */
|
||||
if (len) {
|
||||
size_t i;
|
||||
|
||||
scx200_wdt_ping();
|
||||
|
||||
expect_close = 0;
|
||||
for (i = 0; i < len; ++i) {
|
||||
char c;
|
||||
if (get_user(c, data + i))
|
||||
return -EFAULT;
|
||||
if (c == 'V')
|
||||
expect_close = 42;
|
||||
}
|
||||
|
||||
return len;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static long scx200_wdt_ioctl(struct file *file, unsigned int cmd,
|
||||
unsigned long arg)
|
||||
{
|
||||
void __user *argp = (void __user *)arg;
|
||||
int __user *p = argp;
|
||||
static const struct watchdog_info ident = {
|
||||
.identity = "NatSemi SCx200 Watchdog",
|
||||
.firmware_version = 1,
|
||||
.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING |
|
||||
WDIOF_MAGICCLOSE,
|
||||
};
|
||||
int new_margin;
|
||||
|
||||
switch (cmd) {
|
||||
case WDIOC_GETSUPPORT:
|
||||
if (copy_to_user(argp, &ident, sizeof(ident)))
|
||||
return -EFAULT;
|
||||
return 0;
|
||||
case WDIOC_GETSTATUS:
|
||||
case WDIOC_GETBOOTSTATUS:
|
||||
if (put_user(0, p))
|
||||
return -EFAULT;
|
||||
return 0;
|
||||
case WDIOC_KEEPALIVE:
|
||||
scx200_wdt_ping();
|
||||
return 0;
|
||||
case WDIOC_SETTIMEOUT:
|
||||
if (get_user(new_margin, p))
|
||||
return -EFAULT;
|
||||
if (new_margin < 1)
|
||||
return -EINVAL;
|
||||
margin = new_margin;
|
||||
scx200_wdt_update_margin();
|
||||
scx200_wdt_ping();
|
||||
case WDIOC_GETTIMEOUT:
|
||||
if (put_user(margin, p))
|
||||
return -EFAULT;
|
||||
return 0;
|
||||
default:
|
||||
return -ENOTTY;
|
||||
}
|
||||
}
|
||||
|
||||
static const struct file_operations scx200_wdt_fops = {
|
||||
.owner = THIS_MODULE,
|
||||
.llseek = no_llseek,
|
||||
.write = scx200_wdt_write,
|
||||
.unlocked_ioctl = scx200_wdt_ioctl,
|
||||
.open = scx200_wdt_open,
|
||||
.release = scx200_wdt_release,
|
||||
};
|
||||
|
||||
static struct miscdevice scx200_wdt_miscdev = {
|
||||
.minor = WATCHDOG_MINOR,
|
||||
.name = "watchdog",
|
||||
.fops = &scx200_wdt_fops,
|
||||
};
|
||||
|
||||
static int __init scx200_wdt_init(void)
|
||||
{
|
||||
int r;
|
||||
|
||||
pr_debug("NatSemi SCx200 Watchdog Driver\n");
|
||||
|
||||
/* check that we have found the configuration block */
|
||||
if (!scx200_cb_present())
|
||||
return -ENODEV;
|
||||
|
||||
if (!request_region(scx200_cb_base + SCx200_WDT_OFFSET,
|
||||
SCx200_WDT_SIZE,
|
||||
"NatSemi SCx200 Watchdog")) {
|
||||
pr_warn("watchdog I/O region busy\n");
|
||||
return -EBUSY;
|
||||
}
|
||||
|
||||
scx200_wdt_update_margin();
|
||||
scx200_wdt_disable();
|
||||
|
||||
r = register_reboot_notifier(&scx200_wdt_notifier);
|
||||
if (r) {
|
||||
pr_err("unable to register reboot notifier\n");
|
||||
release_region(scx200_cb_base + SCx200_WDT_OFFSET,
|
||||
SCx200_WDT_SIZE);
|
||||
return r;
|
||||
}
|
||||
|
||||
r = misc_register(&scx200_wdt_miscdev);
|
||||
if (r) {
|
||||
unregister_reboot_notifier(&scx200_wdt_notifier);
|
||||
release_region(scx200_cb_base + SCx200_WDT_OFFSET,
|
||||
SCx200_WDT_SIZE);
|
||||
return r;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void __exit scx200_wdt_cleanup(void)
|
||||
{
|
||||
misc_deregister(&scx200_wdt_miscdev);
|
||||
unregister_reboot_notifier(&scx200_wdt_notifier);
|
||||
release_region(scx200_cb_base + SCx200_WDT_OFFSET,
|
||||
SCx200_WDT_SIZE);
|
||||
}
|
||||
|
||||
module_init(scx200_wdt_init);
|
||||
module_exit(scx200_wdt_cleanup);
|
||||
|
||||
/*
|
||||
Local variables:
|
||||
compile-command: "make -k -C ../.. SUBDIRS=drivers/char modules"
|
||||
c-basic-offset: 8
|
||||
End:
|
||||
*/
|
||||
Loading…
Add table
Add a link
Reference in a new issue