Re: [Qemu-devel] [PATCH v2 1/2] ps2: add support of auto-repeat

[Anthony Liguori <aliguori@us.ibm.com>]

Amos Kong <akong@redhat.com> writes:

> Guest driver sets repeat rate and delay time by KBD_CMD_SET_RATE,
> but ps2 backend doesn't process it and no auto-repeat implementation.
> This patch adds support of auto-repeat feature. The repeated events
> from host are ignored and re-implements ps2's auto-repeat.
>
> Guest ps2 driver sets autorepeat to fastest possible in reset,
> period: 250ms, delay: 33ms
>
> Tested by 'sendkey' monitor command.
> Tested by Linux & Windows guests with SDL, VNC, SPICE, GTK+
>
> referenced: http://www.computer-engineering.org/ps2keyboard/
>
> Signed-off-by: Amos Kong <akong@redhat.com>
> ---
>  hw/input/ps2.c | 41 +++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 41 insertions(+)
>
> diff --git a/hw/input/ps2.c b/hw/input/ps2.c
> index 3412079..8adbb4a 100644
> --- a/hw/input/ps2.c
> +++ b/hw/input/ps2.c
> @@ -94,6 +94,10 @@ typedef struct {
>      int translate;
>      int scancode_set; /* 1=XT, 2=AT, 3=PS/2 */
>      int ledstate;
> +    int repeat_period; /* typematic period, ms */
> +    int repeat_delay; /* typematic delay, ms */
> +    int repeat_key; /* keycode to repeat */
> +    QEMUTimer *repeat_timer;

This state needs to be migrated, no?  I suspect it can/should be done
via a subsection too.

Regards,

Anthony Liguori

>  } PS2KbdState;
>  
>  typedef struct {
> @@ -146,6 +150,15 @@ void ps2_queue(void *opaque, int b)
>      s->update_irq(s->update_arg, 1);
>  }
>  
> +static void repeat_ps2_queue(void *opaque)
> +{
> +    PS2KbdState *s = opaque;
> +
> +    qemu_mod_timer(s->repeat_timer, qemu_get_clock_ns(vm_clock) +
> +                   muldiv64(get_ticks_per_sec(), s->repeat_period, 1000));
> +    ps2_queue(&s->common, s->repeat_key);
> +}
> +
>  /*
>     keycode is expressed as follow:
>     bit 7    - 0 key pressed, 1 = key released
> @@ -167,7 +180,23 @@ static void ps2_put_keycode(void *opaque, int keycode)
>              keycode = ps2_raw_keycode_set3[keycode & 0x7f];
>          }
>        }
> +
> +    /* ignore repeated events from host, re-implement it */
> +    if (keycode == s->repeat_key) {
> +        return;
> +    }
>      ps2_queue(&s->common, keycode);
> +    qemu_del_timer(s->repeat_timer);
> +
> +    /* only auto-repeat press event */
> +    if (!(keycode & 0x80)) {
> +        s->repeat_key = keycode;
> +        /* delay a while before first repeat */
> +        qemu_mod_timer(s->repeat_timer, qemu_get_clock_ns(vm_clock) +
> +                       muldiv64(get_ticks_per_sec(), s->repeat_delay, 1000));
> +    } else {
> +        s->repeat_key = -1;
> +    }
>  }
>  
>  uint32_t ps2_read_data(void *opaque)
> @@ -213,6 +242,11 @@ static void ps2_reset_keyboard(PS2KbdState *s)
>  
>  void ps2_write_keyboard(void *opaque, int val)
>  {
> +    /* repeat period/delay table from kernel (drivers/input/keyboard/atkbd.c) */
> +    const short period[32] = { 33,  37,  42,  46,  50,  54,  58,  63,  67,  75,
> +                83,  92, 100, 109, 116, 125, 133, 149, 167, 182, 200, 217, 232,
> +                250, 270, 303, 333, 370, 400, 435, 470, 500 };
> +    const short delay[4] = { 250, 500, 750, 1000 };
>      PS2KbdState *s = (PS2KbdState *)opaque;
>  
>      switch(s->common.write_cmd) {
> @@ -288,6 +322,10 @@ void ps2_write_keyboard(void *opaque, int val)
>          s->common.write_cmd = -1;
>          break;
>      case KBD_CMD_SET_RATE:
> +       /* Bit0-4 specifies the repeat rate */
> +        s->repeat_period = period[val & 0x1f];
> +       /* Bit5-6 bit specifies the delay time */
> +        s->repeat_delay = delay[val >> 5 & 0x3];
>          ps2_queue(&s->common, KBD_REPLY_ACK);
>          s->common.write_cmd = -1;
>          break;
> @@ -536,6 +574,9 @@ static void ps2_kbd_reset(void *opaque)
>      s->scan_enabled = 0;
>      s->translate = 0;
>      s->scancode_set = 0;
> +    s->repeat_period = 92;
> +    s->repeat_delay = 500;
> +    s->repeat_timer = qemu_new_timer_ns(vm_clock, repeat_ps2_queue, s);
>  }
>  
>  static void ps2_mouse_reset(void *opaque)
> -- 
> 1.8.1.4