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path: root/drivers/s390/char/sclp_vt220.c
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Diffstat (limited to 'drivers/s390/char/sclp_vt220.c')
-rw-r--r--drivers/s390/char/sclp_vt220.c52
1 files changed, 51 insertions, 1 deletions
diff --git a/drivers/s390/char/sclp_vt220.c b/drivers/s390/char/sclp_vt220.c
index ae67386c0..68d6ee7ae 100644
--- a/drivers/s390/char/sclp_vt220.c
+++ b/drivers/s390/char/sclp_vt220.c
@@ -12,6 +12,7 @@
#include <linux/wait.h>
#include <linux/timer.h>
#include <linux/kernel.h>
+#include <linux/sysrq.h>
#include <linux/tty.h>
#include <linux/tty_driver.h>
#include <linux/tty_flip.h>
@@ -27,6 +28,7 @@
#include <asm/uaccess.h>
#include "sclp.h"
+#include "ctrlchar.h"
#define SCLP_VT220_MAJOR TTY_MAJOR
#define SCLP_VT220_MINOR 65
@@ -477,6 +479,53 @@ sclp_vt220_write(struct tty_struct *tty, const unsigned char *buf, int count)
#define SCLP_VT220_SESSION_STARTED 0x80
#define SCLP_VT220_SESSION_DATA 0x00
+#ifdef CONFIG_MAGIC_SYSRQ
+
+static int sysrq_pressed;
+static struct sysrq_work sysrq;
+
+static void sclp_vt220_reset_session(void)
+{
+ sysrq_pressed = 0;
+}
+
+static void sclp_vt220_handle_input(const char *buffer, unsigned int count)
+{
+ int i;
+
+ for (i = 0; i < count; i++) {
+ /* Handle magic sys request */
+ if (buffer[i] == ('O' ^ 0100)) { /* CTRL-O */
+ /*
+ * If pressed again, reset sysrq_pressed
+ * and flip CTRL-O character
+ */
+ sysrq_pressed = !sysrq_pressed;
+ if (sysrq_pressed)
+ continue;
+ } else if (sysrq_pressed) {
+ sysrq.key = buffer[i];
+ schedule_sysrq_work(&sysrq);
+ sysrq_pressed = 0;
+ continue;
+ }
+ tty_insert_flip_char(&sclp_vt220_port, buffer[i], 0);
+ }
+}
+
+#else
+
+static void sclp_vt220_reset_session(void)
+{
+}
+
+static void sclp_vt220_handle_input(const char *buffer, unsigned int count)
+{
+ tty_insert_flip_string(&sclp_vt220_port, buffer, count);
+}
+
+#endif
+
/*
* Called by the SCLP to report incoming event buffers.
*/
@@ -492,12 +541,13 @@ sclp_vt220_receiver_fn(struct evbuf_header *evbuf)
switch (*buffer) {
case SCLP_VT220_SESSION_ENDED:
case SCLP_VT220_SESSION_STARTED:
+ sclp_vt220_reset_session();
break;
case SCLP_VT220_SESSION_DATA:
/* Send input to line discipline */
buffer++;
count--;
- tty_insert_flip_string(&sclp_vt220_port, buffer, count);
+ sclp_vt220_handle_input(buffer, count);
tty_flip_buffer_push(&sclp_vt220_port);
break;
}