Re: [Qemu-devel] [PATCH] ps2: add support of auto-repeat

[Lei Li <lilei@linux.vnet.ibm.com>]

On 05/16/2013 12:30 PM, Amos Kong wrote:
> 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.
>
> Guest ps2 driver sets autorepeat to fastest possible in reset,
> period: 250ms, delay: 33ms
>
> Tested by 'sendkey' monitor command.
>
> referenced: http://www.computer-engineering.org/ps2keyboard/
>
> Signed-off-by: Amos Kong <akong@redhat.com>
> ---
>   hw/input/ps2.c | 42 ++++++++++++++++++++++++++++++++++++++++++
>   1 file changed, 42 insertions(+)
>
> diff --git a/hw/input/ps2.c b/hw/input/ps2.c
> index 3412079..1cfe055 100644
> --- a/hw/input/ps2.c
> +++ b/hw/input/ps2.c
> @@ -94,6 +94,9 @@ 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 */
>   } PS2KbdState;
>
>   typedef struct {
> @@ -146,6 +149,22 @@ void ps2_queue(void *opaque, int b)
>       s->update_irq(s->update_arg, 1);
>   }
>
> +static QEMUTimer *repeat_timer;
> +static bool auto_repeat;
> +
> +static void repeat_ps2_queue(void *opaque)
> +{
> +    PS2KbdState *s = opaque;
> +
> +    if (auto_repeat) {
> +        qemu_mod_timer(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 +186,17 @@ static void ps2_put_keycode(void *opaque, int keycode)
>               keycode = ps2_raw_keycode_set3[keycode & 0x7f];
>           }
>         }
> +
> +    /* only auto-repeat press event */
> +    auto_repeat = ~keycode & 0x80;

Does this check allow to distinguish the difference between auto-repeat and
actual repeated entry by the user?
  

>       ps2_queue(&s->common, keycode);
> +
> +    if (auto_repeat) {
> +        s->repeat_key = keycode;
> +        /* delay a while before first repeat */
> +        qemu_mod_timer(repeat_timer, qemu_get_clock_ns(vm_clock) +
> +                       muldiv64(get_ticks_per_sec(), s->repeat_delay, 1000));
> +    }
>   }
>
>   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 +322,11 @@ 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 & 0x60) >> 5];
> +
>           ps2_queue(&s->common, KBD_REPLY_ACK);
>           s->common.write_cmd = -1;
>           break;
> @@ -536,6 +575,8 @@ 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;
>   }
>
>   static void ps2_mouse_reset(void *opaque)
> @@ -660,6 +701,7 @@ void *ps2_kbd_init(void (*update_irq)(void *, int), void *update_arg)
>       vmstate_register(NULL, 0, &vmstate_ps2_keyboard, s);
>       qemu_add_kbd_event_handler(ps2_put_keycode, s);
>       qemu_register_reset(ps2_kbd_reset, s);
> +    repeat_timer = qemu_new_timer_ns(vm_clock, repeat_ps2_queue, s);
>       return s;
>   }
>


-- 
Lei