linux-kernel - Re: [PATCH 1/2] xen/input: use string constants from PV protocol

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Date:   Thu, 20 Apr 2017 19:11:00 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Oleksandr Andrushchenko <andr2000@...il.com>
Cc:     xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org,
        linux-input@...r.kernel.org, joculator@...il.com, al1img@...il.com,
        vlad.babchuk@...il.com, andrii.anisov@...il.com,
        olekstysh@...il.com, boris.ostrovsky@...cle.com, jgross@...e.com,
        Oleksandr Andrushchenko <oleksandr_andrushchenko@...m.com>
Subject: Re: [PATCH 1/2] xen/input: use string constants from PV protocol

On Thu, Apr 13, 2017 at 02:38:03PM +0300, Oleksandr Andrushchenko wrote:
> From: Oleksandr Andrushchenko <oleksandr_andrushchenko@...m.com>
> 
> Xen input para-virtual protocol defines string constants
> used by both back and frontend. Use those instead of
> explicit strings in the frontend driver.
> 
> Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@...m.com>

I'll have to postpone it until I receive changes containing these new
string constants. Otherwise it looks OK.

> ---
>  drivers/input/misc/xen-kbdfront.c | 22 +++++++++++++---------
>  1 file changed, 13 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/input/misc/xen-kbdfront.c b/drivers/input/misc/xen-kbdfront.c
> index 2fc7895373ab..01c27b4c3288 100644
> --- a/drivers/input/misc/xen-kbdfront.c
> +++ b/drivers/input/misc/xen-kbdfront.c
> @@ -135,14 +135,17 @@ static int xenkbd_probe(struct xenbus_device *dev,
>  		goto error_nomem;
>  
>  	/* Set input abs params to match backend screen res */
> -	abs = xenbus_read_unsigned(dev->otherend, "feature-abs-pointer", 0);
> -	ptr_size[KPARAM_X] = xenbus_read_unsigned(dev->otherend, "width",
> +	abs = xenbus_read_unsigned(dev->otherend,
> +				   XENKBD_FIELD_FEAT_ABS_POINTER, 0);
> +	ptr_size[KPARAM_X] = xenbus_read_unsigned(dev->otherend,
> +						  XENKBD_FIELD_WIDTH,
>  						  ptr_size[KPARAM_X]);
> -	ptr_size[KPARAM_Y] = xenbus_read_unsigned(dev->otherend, "height",
> +	ptr_size[KPARAM_Y] = xenbus_read_unsigned(dev->otherend,
> +						  XENKBD_FIELD_HEIGHT,
>  						  ptr_size[KPARAM_Y]);
>  	if (abs) {
>  		ret = xenbus_write(XBT_NIL, dev->nodename,
> -				   "request-abs-pointer", "1");
> +				   XENKBD_FIELD_REQ_ABS_POINTER, "1");
>  		if (ret) {
>  			pr_warning("xenkbd: can't request abs-pointer");
>  			abs = 0;
> @@ -271,14 +274,15 @@ static int xenkbd_connect_backend(struct xenbus_device *dev,
>  		xenbus_dev_fatal(dev, ret, "starting transaction");
>  		goto error_irqh;
>  	}
> -	ret = xenbus_printf(xbt, dev->nodename, "page-ref", "%lu",
> +	ret = xenbus_printf(xbt, dev->nodename, XENKBD_FIELD_RING_REF, "%lu",
>  			    virt_to_gfn(info->page));
>  	if (ret)
>  		goto error_xenbus;
> -	ret = xenbus_printf(xbt, dev->nodename, "page-gref", "%u", info->gref);
> +	ret = xenbus_printf(xbt, dev->nodename, XENKBD_FIELD_RING_GREF,
> +			    "%u", info->gref);
>  	if (ret)
>  		goto error_xenbus;
> -	ret = xenbus_printf(xbt, dev->nodename, "event-channel", "%u",
> +	ret = xenbus_printf(xbt, dev->nodename, XENKBD_FIELD_EVT_CHANNEL, "%u",
>  			    evtchn);
>  	if (ret)
>  		goto error_xenbus;
> @@ -353,7 +357,7 @@ static void xenkbd_backend_changed(struct xenbus_device *dev,
>  }
>  
>  static const struct xenbus_device_id xenkbd_ids[] = {
> -	{ "vkbd" },
> +	{ XENKBD_DRIVER_NAME },
>  	{ "" }
>  };
>  
> @@ -390,4 +394,4 @@ module_exit(xenkbd_cleanup);
>  
>  MODULE_DESCRIPTION("Xen virtual keyboard/pointer device frontend");
>  MODULE_LICENSE("GPL");
> -MODULE_ALIAS("xen:vkbd");
> +MODULE_ALIAS("xen:" XENKBD_DRIVER_NAME);
> -- 
> 2.7.4
> 

-- 
Dmitry