[Qemu-devel] [PATCH] Enhance sendkey with key hold time - v2

[Jan Kiszka]

[ Addressing reviewer comments ]

Current key injection via the monitor basically generates no key hold
time. This is fine for keyboard emulations that have their own queues,
but it causes troubles for those how don't (like the MusicPal - it
simply does not work with injected keys). Moreover, I would like to use
this mechanism to simulate pressed buttons during power-up.

Therefore, this patch enhances the key injection with a configurable
release delay (by default 100 virtual milliseconds).

This feature allows to get rid of the initial sleep() in musicpal_init
because one can now simply start qemu with -S and issue "sendkey m 1000"
and "continue" in the monitor to achieve the desired effect of a pressed
menu button during power-up. So there is no need for a per-musicpal or
even qemu-wide "-hold-button" switch.

Signed-off-by: Jan Kiszka <address@hidden>
---
 hw/musicpal.c |    6 ------
 monitor.c     |   58 +++++++++++++++++++++++++++++++++++++++-------------------
 2 files changed, 39 insertions(+), 25 deletions(-)

Index: b/hw/musicpal.c
===================================================================
--- a/hw/musicpal.c
+++ b/hw/musicpal.c
@@ -1504,12 +1504,6 @@ static void musicpal_init(ram_addr_t ram
 
     qemu_add_kbd_event_handler(musicpal_key_event, pic[MP_GPIO_IRQ]);
 
-    /*
-     * Wait a bit to catch menu button during U-Boot start-up
-     * (to trigger emergency update).
-     */
-    sleep(1);
-
     mv88w8618_eth_init(&nd_table[0], MP_ETH_BASE, pic[MP_ETH_IRQ]);
 
     mixer_i2c = musicpal_audio_init(MP_AUDIO_BASE, pic[MP_AUDIO_IRQ]);
Index: b/monitor.c
===================================================================
--- a/monitor.c
+++ b/monitor.c
@@ -35,10 +35,7 @@
 #include "audio/audio.h"
 #include "disas.h"
 #include <dirent.h>
-
-#ifdef CONFIG_PROFILER
-#include "qemu-timer.h" /* for ticks_per_sec */
-#endif
+#include "qemu-timer.h"
 
 //#define DEBUG
 //#define DEBUG_COMPLETION
@@ -920,14 +917,37 @@ static int get_keycode(const char *key)
     return -1;
 }
 
-static void do_sendkey(const char *string)
+#define MAX_KEYCODES 16
+static uint8_t keycodes[MAX_KEYCODES];
+static int nb_pending_keycodes;
+static QEMUTimer *key_timer;
+
+static void release_keys(void *opaque)
+{
+    int keycode;
+
+    while (nb_pending_keycodes > 0) {
+        nb_pending_keycodes--;
+        keycode = keycodes[nb_pending_keycodes];
+        if (keycode & 0x80)
+            kbd_put_keycode(0xe0);
+        kbd_put_keycode(keycode | 0x80);
+    }
+}
+
+static void do_sendkey(const char *string, int has_hold_time, int hold_time)
 {
-    uint8_t keycodes[16];
-    int nb_keycodes = 0;
     char keyname_buf[16];
     char *separator;
     int keyname_len, keycode, i;
 
+    if (nb_pending_keycodes > 0) {
+        qemu_del_timer(key_timer);
+        release_keys(NULL);
+    }
+    if (!has_hold_time)
+        hold_time = 100;
+    i = 0;
     while (1) {
         separator = strchr(string, '-');
         keyname_len = separator ? separator - string : strlen(string);
@@ -937,7 +957,7 @@ static void do_sendkey(const char *strin
                 term_printf("invalid key: '%s...'\n", keyname_buf);
                 return;
             }
-            if (nb_keycodes == sizeof(keycodes)) {
+            if (i == MAX_KEYCODES) {
                 term_printf("too many keys\n");
                 return;
             }
@@ -947,26 +967,23 @@ static void do_sendkey(const char *strin
                 term_printf("unknown key: '%s'\n", keyname_buf);
                 return;
             }
-            keycodes[nb_keycodes++] = keycode;
+            keycodes[i++] = keycode;
         }
         if (!separator)
             break;
         string = separator + 1;
     }
+    nb_pending_keycodes = i;
     /* key down events */
-    for(i = 0; i < nb_keycodes; i++) {
+    for (i = 0; i < nb_pending_keycodes; i++) {
         keycode = keycodes[i];
         if (keycode & 0x80)
             kbd_put_keycode(0xe0);
         kbd_put_keycode(keycode & 0x7f);
     }
-    /* key up events */
-    for(i = nb_keycodes - 1; i >= 0; i--) {
-        keycode = keycodes[i];
-        if (keycode & 0x80)
-            kbd_put_keycode(0xe0);
-        kbd_put_keycode(keycode | 0x80);
-    }
+    /* delayed key up events */
+    qemu_mod_timer(key_timer,
+                   qemu_get_clock(vm_clock) + ticks_per_sec * hold_time);
 }
 
 static int mouse_button_state;
@@ -1353,8 +1370,8 @@ static term_cmd_t term_cmds[] = {
     { "i", "/ii.", do_ioport_read,
       "/fmt addr", "I/O port read" },
 
-    { "sendkey", "s", do_sendkey,
-      "keys", "send keys to the VM (e.g. 'sendkey ctrl-alt-f1')" },
+    { "sendkey", "si?", do_sendkey,
+      "keys [hold_ms]", "send keys to the VM (e.g. 'sendkey ctrl-alt-f1', 
default hold time=100 ms)" },
     { "system_reset", "", do_system_reset,
       "", "reset the system" },
     { "system_powerdown", "", do_system_powerdown,
@@ -2638,6 +2655,9 @@ void monitor_init(CharDriverState *hd, i
     int i;
 
     if (is_first_init) {
+        key_timer = qemu_new_timer(vm_clock, release_keys, NULL);
+        if (!key_timer)
+            return;
         for (i = 0; i < MAX_MON; i++) {
             monitor_hd[i] = NULL;
         }