[23/28] keyboard, input: Add hook to input to allow low level event clear

Commit Message

Jason Wessel Feb. 25, 2010, 9:21 p.m. UTC

None

Patch

diff --git a/drivers/char/keyboard.c b/drivers/char/keyboard.c
index f706b1d..d61145a 100644
--- a/drivers/char/keyboard.c
+++ b/drivers/char/keyboard.c
@@ -1195,6 +1195,11 @@  static void kbd_keycode(unsigned int keycode, int down, int hw_raw)
 			if (keycode < BTN_MISC && printk_ratelimit())
 				printk(KERN_WARNING "keyboard.c: can't emulate rawmode for keycode %d\n", keycode);
 
+	if (down)
+		set_bit(keycode, key_down);
+	else
+		clear_bit(keycode, key_down);
+
 #ifdef CONFIG_MAGIC_SYSRQ	       /* Handle the SysRq Hack */
 	if (keycode == KEY_SYSRQ && (sysrq_down || (down == 1 && sysrq_alt))) {
 		if (!sysrq_down) {
@@ -1237,11 +1242,6 @@  static void kbd_keycode(unsigned int keycode, int down, int hw_raw)
 		raw_mode = 1;
 	}
 
-	if (down)
-		set_bit(keycode, key_down);
-	else
-		clear_bit(keycode, key_down);
-
 	if (rep &&
 	    (!vc_kbd_mode(kbd, VC_REPEAT) ||
 	     (tty && !L_ECHO(tty) && tty_chars_in_buffer(tty)))) {
@@ -1410,6 +1410,22 @@  static const struct input_device_id kbd_ids[] = {
 
 MODULE_DEVICE_TABLE(input, kbd_ids);
 
+#ifdef CONFIG_KDB_KEYBOARD
+void kbd_clear_keys(void)
+{
+	int i, j, k;
+
+	for (i = 0; i < ARRAY_SIZE(key_down); i++) {
+		k = i * BITS_PER_LONG;
+		for (j = 0; j < BITS_PER_LONG; j++, k++) {
+			if (test_bit(k, key_down)) {
+				kbd_keycode(k, 0, 0);
+			}
+		}
+	}
+}
+#endif
+
 static struct input_handler kbd_handler = {
 	.event		= kbd_event,
 	.connect	= kbd_connect,
@@ -1417,6 +1433,9 @@  static struct input_handler kbd_handler = {
 	.start		= kbd_start,
 	.name		= "kbd",
 	.id_table	= kbd_ids,
+#ifdef CONFIG_KDB_KEYBOARD
+	.dbg_clear_keys = kbd_clear_keys,
+#endif
 };
 
 int __init kbd_init(void)
diff --git a/drivers/input/input.c b/drivers/input/input.c
index 86cb2d2..7473300 100644
--- a/drivers/input/input.c
+++ b/drivers/input/input.c
@@ -1692,6 +1692,21 @@  int input_register_handler(struct input_handler *handler)
 }
 EXPORT_SYMBOL(input_register_handler);
 
+#ifdef CONFIG_KDB_KEYBOARD
+/* input_db_clear_keys - Clear any keyboards if they have a call back,
+ * after returning from the kernel debugger
+ */
+void input_dbg_clear_keys(void)
+{
+	struct input_handler *handler;
+
+	list_for_each_entry(handler, &input_handler_list, node)
+		if (handler->dbg_clear_keys)
+			handler->dbg_clear_keys();
+}
+EXPORT_SYMBOL_GPL(input_dbg_clear_keys);
+#endif
+
 /**
  * input_unregister_handler - unregisters an input handler
  * @handler: handler to be unregistered
diff --git a/drivers/serial/kgdboc.c b/drivers/serial/kgdboc.c
index b765ab4..201cdf5 100644
--- a/drivers/serial/kgdboc.c
+++ b/drivers/serial/kgdboc.c
@@ -17,6 +17,7 @@ 
 #include <linux/kdb.h>
 #include <linux/tty.h>
 #include <linux/console.h>
+#include <linux/input.h>
 
 #define MAX_CONFIG_LEN		40
 
@@ -35,12 +36,16 @@  static struct tty_driver	*kgdb_tty_driver;
 static int			kgdb_tty_line;
 
 #ifdef CONFIG_KDB_KEYBOARD
+static int kgdboc_use_kbd;  /* 1 if we use a keyboard */
+
 static int kgdboc_register_kbd(char **cptr)
 {
+	kgdboc_use_kbd = 0;
 	if (strncmp(*cptr, "kbd", 3) == 0) {
 		if (kdb_poll_idx < KDB_POLL_FUNC_MAX) {
 			kdb_poll_funcs[kdb_poll_idx] = kdb_get_kbd_char;
 			kdb_poll_idx++;
+			kgdboc_use_kbd = 1;
 			if (cptr[0][3] == ',')
 				*cptr += 4;
 			else
@@ -63,9 +68,16 @@  static void kgdboc_unregister_kbd(void)
 		}
 	}
 }
+
+static inline void kgdboc_clear_kbd(void)
+{
+	if (kgdboc_use_kbd)
+		input_dbg_clear_keys(); /* Release all pressed keys */
+}
 #else /* ! CONFIG_KDB_KEYBOARD */
 #define kgdboc_register_kbd(x) 0
 #define kgdboc_unregister_kbd()
+#define kgdboc_clear_kbd()
 #endif /* ! CONFIG_KDB_KEYBOARD */
 
 static int kgdboc_option_setup(char *opt)
@@ -213,6 +225,7 @@  static void kgdboc_post_exp_handler(void)
 	/* decrement the module count when the debugger detaches */
 	if (!kgdb_connected)
 		module_put(THIS_MODULE);
+	kgdboc_clear_kbd();
 }
 
 static struct kgdb_io kgdboc_io_ops = {
diff --git a/include/linux/input.h b/include/linux/input.h
index 663208a..9529b63 100644
--- a/include/linux/input.h
+++ b/include/linux/input.h
@@ -1232,6 +1232,9 @@  struct input_handler {
 	int (*connect)(struct input_handler *handler, struct input_dev *dev, const struct input_device_id *id);
 	void (*disconnect)(struct input_handle *handle);
 	void (*start)(struct input_handle *handle);
+#ifdef CONFIG_KDB_KEYBOARD
+	void (*dbg_clear_keys)(void);
+#endif
 
 	const struct file_operations *fops;
 	int minor;
@@ -1317,6 +1320,13 @@  int input_flush_device(struct input_handle* handle, struct file* file);
 void input_event(struct input_dev *dev, unsigned int type, unsigned int code, int value);
 void input_inject_event(struct input_handle *handle, unsigned int type, unsigned int code, int value);
 
+#ifdef CONFIG_KDB_KEYBOARD
+void input_dbg_clear_keys(void);
+#else
+static inline void input_dbg_clear_keys(void)
+{}
+#endif
+
 static inline void input_report_key(struct input_dev *dev, unsigned int code, int value)
 {
 	input_event(dev, EV_KEY, code, !!value);