linux-kernel - Re: [PATCH v3 04/13] HID: hid-input: add usage_index in struct hid

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Message-ID: <20121113153833.GA485@polaris.bitmath.org>
Date:	Tue, 13 Nov 2012 16:38:33 +0100
From:	"Henrik Rydberg" <rydberg@...omail.se>
To:	Benjamin Tissoires <benjamin.tissoires@...il.com>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Jiri Kosina <jkosina@...e.cz>,
	Stephane Chatty <chatty@...c.fr>, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 04/13] HID: hid-input: add usage_index in struct
 hid_usage.

Hi Benjamin,

> Currently, there is no way to know the index of the current field
> in the .input_mapping and .event callbacks  when this field is inside
> an array of HID fields.
> This patch adds this index to the struct hid_usage so that this
> information is available to input_mapping and event callbacks.
> 
> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...il.com>
> ---
>  drivers/hid/hid-core.c | 4 ++++
>  include/linux/hid.h    | 1 +
>  2 files changed, 5 insertions(+)
> 
> diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
> index 9da3007..8f82c4c 100644
> --- a/drivers/hid/hid-core.c
> +++ b/drivers/hid/hid-core.c
> @@ -92,6 +92,7 @@ EXPORT_SYMBOL_GPL(hid_register_report);
>  static struct hid_field *hid_register_field(struct hid_report *report, unsigned usages, unsigned values)
>  {
>  	struct hid_field *field;
> +	int i;
>  
>  	if (report->maxfield == HID_MAX_FIELDS) {
>  		hid_err(report->device, "too many fields in report\n");
> @@ -110,6 +111,9 @@ static struct hid_field *hid_register_field(struct hid_report *report, unsigned
>  	field->value = (s32 *)(field->usage + usages);
>  	field->report = report;
>  
> +	for (i = 0; i < usages; i++)
> +		field->usage[i].usage_index = i;
> +
>  	return field;
>  }
>  
> diff --git a/include/linux/hid.h b/include/linux/hid.h
> index a110a3e..6b4f322 100644
> --- a/include/linux/hid.h
> +++ b/include/linux/hid.h
> @@ -380,6 +380,7 @@ struct hid_usage {
>  	unsigned  hid;			/* hid usage code */
>  	unsigned  collection_index;	/* index into collection array */
>  	/* hidinput data */
> +	unsigned  usage_index;		/* index into usage array */

Is  this really hidinput data? Should it not be one line above?

>  	__u16     code;			/* input driver code */
>  	__u8      type;			/* input driver type */
>  	__s8	  hat_min;		/* hat switch fun */
> -- 
> 1.7.11.7
> 

Thanks,
Henrik
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