Re: [Qemu-devel] [PATCH 13/16] usb-hid: add hid_has_events()

[TeLeMan <geleman@gmail.com>]

On Thu, Aug 4, 2011 at 23:10, Gerd Hoffmann <kraxel@redhat.com> wrote:
> Add hid_has_events function, use it to figure whenever there are pending
> events instead of checking and updating USBHIDState->changed.
>
> Setting ->changed to 1 on init is removed, that should have absolutely
> no effect as the initial state of ->idle is 0 so we report hid state
> anyway until the guest configures some idle time.  Also should clear
> ->idle on reset.
>
> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
> ---
>  hw/usb-hid.c |   16 +++++++---------
>  1 files changed, 7 insertions(+), 9 deletions(-)
>
> diff --git a/hw/usb-hid.c b/hw/usb-hid.c
> index 870cc66..b730692 100644
> --- a/hw/usb-hid.c
> +++ b/hw/usb-hid.c
> @@ -88,7 +88,6 @@ typedef struct USBHIDState {
>     int32_t protocol;
>     uint8_t idle;
>     int64_t next_idle_clock;
> -    int changed;
>     void *datain_opaque;
>     void (*datain)(void *);
>  } USBHIDState;
> @@ -444,12 +443,15 @@ static const uint8_t usb_hid_usage_keys[0x100] = {
>     0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
>  };
>
> +static bool hid_has_events(HIDState *hs)
> +{
> +    return hs->n > 0;
> +}
> +
>  static void usb_hid_changed(HIDState *hs)
>  {
>     USBHIDState *us = container_of(hs, USBHIDState, hid);
>
> -    us->changed = 1;
> -
>     if (us->datain) {
>         us->datain(us->datain_opaque);
>     }
> @@ -742,6 +744,7 @@ static void usb_hid_handle_reset(USBDevice *dev)
>
>     hid_handle_reset(&us->hid);
>     us->protocol = 1;
> +    us->idle = 0;
>  }
>
>  static void usb_hid_set_next_idle(USBHIDState *s, int64_t curtime)
> @@ -798,7 +801,6 @@ static int usb_hid_handle_control(USBDevice *dev, USBPacket *p,
>         } else if (hs->kind == HID_KEYBOARD) {
>             ret = hid_keyboard_poll(hs, data, length);
>         }
> -        us->changed = hs->n > 0;
>         break;
>     case SET_REPORT:
>         if (hs->kind == HID_KEYBOARD) {
> @@ -849,7 +851,7 @@ static int usb_hid_handle_data(USBDevice *dev, USBPacket *p)
>     case USB_TOKEN_IN:
>         if (p->devep == 1) {
>             int64_t curtime = qemu_get_clock_ns(vm_clock);
> -            if (!us->changed &&
> +            if (!hid_has_events(hs) &&
>                 (!us->idle || us->next_idle_clock - curtime > 0)) {
>                 return USB_RET_NAK;
>             }
> @@ -860,7 +862,6 @@ static int usb_hid_handle_data(USBDevice *dev, USBPacket *p)
>                 ret = hid_keyboard_poll(hs, buf, p->iov.size);
>             }
>             usb_packet_copy(p, buf, ret);
> -            us->changed = hs->n > 0;
>         } else {
>             goto fail;
>         }
> @@ -914,9 +915,6 @@ static int usb_hid_initfn(USBDevice *dev, int kind)
>
>     usb_desc_init(dev);
>     hid_init(&us->hid, kind, usb_hid_changed);
> -
> -    /* Force poll routine to be run and grab input the first time.  */
> -    us->changed = 1;
USB tablet does not work on the winxp guest. I think this code can't be removed.

>     return 0;
>  }
>
> --
> 1.7.1
>
>
>