Re: [Qemu-devel] [PATCH 2/2] Enhance sendkey with key hold time

["andrzej zaborowski" <balrogg@gmail.com>]

On 22/05/2008, Jan Kiszka <jan.kiszka@web.de> wrote:
> 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 <jan.kiszka@web.de>
>  ---
>   hw/musicpal.c |    6 ------
>   monitor.c     |   57 ++++++++++++++++++++++++++++++++++++++-------------------
>   2 files changed, 38 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
>  @@ -925,14 +922,37 @@ 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) {
>  +        keycode = keycodes[nb_pending_keycodes-1];
>  +        if (keycode & 0x80)
>  +            kbd_put_keycode(0xe0);
>  +        kbd_put_keycode(keycode | 0x80);
>  +        nb_pending_keycodes--;
>  +    }
>  +}
>  +
>  +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);
>  @@ -943,7 +963,7 @@ 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;
>              }
>  @@ -953,26 +973,22 @@ 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) + 1000000LL*hold_time);

This should use ticks_per_sec.

Also, 100ms seems high for the default value, I think you rarely press
keys for that long.

Cheers
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