/*
* writing 'C' to /proc/sysrq-trigger is like sysrq-C
*/
static ssize_t write_sysrq_trigger(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
struct ve_struct *cur = get_exec_env();
static int pnum = 10;
if (count) {
int i, cnt;
char c[32];
cnt = min(count, sizeof(c));
if (copy_from_user(c, buf, cnt))
return -EFAULT;
for (i = 0; i < cnt && c[i] != '\n'; i++) {
if (!ve_is_super(cur)) {
if (!pnum)
continue;
printk("SysRq: CT#%u sent '%c' magic key.\n",
cur->veid, c[i]);
pnum--;
continue;
}
__handle_sysrq(c[i], NULL, 0);
}
}
return count;
}
/*
* writing 'C' to /proc/sysrq-trigger is like sysrq-C
*/
static ssize_t write_sysrq_trigger(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
if (count) {
char c;
if (get_user(c, buf))
return -EFAULT;
__handle_sysrq(c, NULL, 0);
}
return count;
}
static bool sysrq_filter(struct input_handle *handle, unsigned int type,
unsigned int code, int value)
{
if (type != EV_KEY)
goto out;
switch (code) {
case KEY_LEFTALT:
case KEY_RIGHTALT:
if (value)
sysrq_alt = code;
else {
if (sysrq_down && code == sysrq_alt_use)
sysrq_down = false;
sysrq_alt = 0;
}
break;
case KEY_SYSRQ:
if (value == 1 && sysrq_alt) {
sysrq_down = true;
sysrq_alt_use = sysrq_alt;
}
break;
default:
if (sysrq_down && value && value != 2)
__handle_sysrq(sysrq_xlate[code], NULL, 1);
break;
}
out:
return sysrq_down;
}
void handle_sysrq(int key)
{
if (sysrq_on())
__handle_sysrq(key, true);
}
/*
* This function is called by the keyboard handler when SysRq is pressed
* and any other keycode arrives.
*/
void handle_sysrq(int key, struct tty_struct *tty)
{
if (sysrq_on())
__handle_sysrq(key, tty, 1);
}
static bool sysrq_filter(struct input_handle *handle, unsigned int type,
unsigned int code, int value)
{
if (type != EV_KEY)
goto out;
switch (code) {
/* use volumedown + volumeup + power for sysrq function */
#ifdef CONFIG_HUAWEI_KERNEL
case KEY_VOLUMEDOWN:
/* identify volumedown pressed down or not */
if (value)
{
sysrq_alt = code;
}
/* when volumedown lifted up clear the state of syrq_down and syrq_alt */
else
{
if (sysrq_down && code == sysrq_alt_use)
{
sysrq_down = false;
}
sysrq_alt = 0;
}
break;
case KEY_VOLUMEUP:
/* identify volumeup pressed down or not */
if (value == 1 && sysrq_alt)
{
sysrq_down = true;
sysrq_alt_use = sysrq_alt;
}
break;
case KEY_POWER:
/* identify power pressed down or not */
if (sysrq_down && value && value != 2)
{
/* trigger system crash */
__handle_sysrq('c', NULL, 1);
}
break;
default:
break;
#else
case KEY_LEFTALT:
case KEY_RIGHTALT:
if (value)
sysrq_alt = code;
else {
if (sysrq_down && code == sysrq_alt_use)
sysrq_down = false;
sysrq_alt = 0;
}
break;
case KEY_SYSRQ:
if (value == 1 && sysrq_alt) {
sysrq_down = true;
sysrq_alt_use = sysrq_alt;
}
break;
default:
if (sysrq_down && value && value != 2)
__handle_sysrq(sysrq_xlate[code], NULL, 1);
break;
#endif
}
out:
return sysrq_down;
}
void handle_sysrq(int key, struct pt_regs *pt_regs, struct tty_struct *tty)
{
if (!sysrq_enabled)
return;
__handle_sysrq(key, pt_regs, tty);
}
/*
* This function is called by the keyboard handler when SysRq is pressed
* and any other keycode arrives.
*/
void handle_sysrq(int key, struct tty_struct *tty)
{
if (!sysrq_enabled)
return;
__handle_sysrq(key, tty, 1);
}
