linux-kernel - Re: [PATCH] i2c-hid: fix length for set/get report in i2c hid

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Date:	Wed, 3 Apr 2013 10:59:30 +0200
From:	Benjamin Tissoires <benjamin.tissoires@...il.com>
To:	Huzefa Kankroliwala <huzefa.nomanx.kankroliwala@...el.com>
Cc:	jkosina@...e.cz, mika.westerberg@...el.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] i2c-hid: fix length for set/get report in i2c hid

Hi Huzefa,

On Tue, Apr 2, 2013 at 12:52 PM, Huzefa Kankroliwala
<huzefa.nomanx.kankroliwala@...el.com> wrote:
> With the current i2c hid driver set/get report does not work
> as expected, for e.g sensor hub properties like power state,
> frequency etc is not set properly on the device as a result
> we do not get events.
> The problem is that i2c hid driver in function i2c_hid_request
> sets length equal to default buffer size for which the sensor
> hub does not respond on get/set commands. Use report length
> and calculate it based on report size and id.

oops, seems like I've been too lazy to get the actual size. Thanks for
fixing it.

I just have one small formatting comment (see below).
Except that, Reviewed-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>

>
> Reviewed-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
> Signed-off-by: Huzefa Kankroliwala <huzefa.nomanx.kankroliwala@...el.com>
> ---
>  drivers/hid/i2c-hid/i2c-hid.c |   10 +++++-----
>  1 files changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/hid/i2c-hid/i2c-hid.c b/drivers/hid/i2c-hid/i2c-hid.c
> index 935f387..c8cd0c0 100644
> --- a/drivers/hid/i2c-hid/i2c-hid.c
> +++ b/drivers/hid/i2c-hid/i2c-hid.c
> @@ -567,18 +567,18 @@ static void i2c_hid_request(struct hid_device *hid, struct hid_report *rep,
>                 int reqtype)
>  {
>         struct i2c_client *client = hid->driver_data;
> -       struct i2c_hid *ihid = i2c_get_clientdata(client);
>         char *buf;
>         int ret;
> +       int len = i2c_hid_get_report_length(rep) - 2;
>
> -       buf = kzalloc(ihid->bufsize, GFP_KERNEL);
> +       buf = kzalloc(len, GFP_KERNEL);
>         if (!buf)
>                 return;
>
>         switch (reqtype) {
>         case HID_REQ_GET_REPORT:
> -               ret = i2c_hid_get_raw_report(hid, rep->id, buf, ihid->bufsize,
> -                                            rep->type);
> +               ret = i2c_hid_get_raw_report(hid, rep->id, buf, len,
> +                                                       rep->type);

No need to add a new line for rep->type when the 80 columns limit is
not reached.

Cheers,
Benjamin

>                 if (ret < 0)
>                         dev_err(&client->dev, "%s: unable to get report: %d\n",
>                                 __func__, ret);
> @@ -587,7 +587,7 @@ static void i2c_hid_request(struct hid_device *hid, struct hid_report *rep,
>                 break;
>         case HID_REQ_SET_REPORT:
>                 hid_output_report(rep, buf);
> -               i2c_hid_output_raw_report(hid, buf, ihid->bufsize, rep->type);
> +               i2c_hid_output_raw_report(hid, buf, len, rep->type);
>                 break;
>         }
>
> --
> 1.7.4.1
>
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