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

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Date:   Fri, 21 Apr 2017 09:42:40 +0300
From:   Oleksandr Andrushchenko <andr2000@...il.com>
To:     Dmitry Torokhov <dmitry.torokhov@...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 04/21/2017 05:11 AM, Dmitry Torokhov wrote:
> 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.
fair enough
>   Otherwise it looks OK.
thank you
>> ---
>>   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
>>
Thank you,
Oleksandr