linux-kernel - Re: [PATCH 1/1] asus-wireless: Use the correct HSWC parameter for each HID

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Date:   Tue, 7 Feb 2017 16:44:32 -0500
From:   João Paulo Rechi Vita <jprvita@...il.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Darren Hart <dvhart@...radead.org>,
        Platform Driver <platform-driver-x86@...r.kernel.org>,
        acpi4asus-user <acpi4asus-user@...ts.sourceforge.net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux@...lessm.com,
        João Paulo Rechi Vita <jprvita@...lessm.com>
Subject: Re: [PATCH 1/1] asus-wireless: Use the correct HSWC parameter for
 each HID

On 4 February 2017 at 10:02, Andy Shevchenko <andy.shevchenko@...il.com> wrote:
> On Wed, Feb 1, 2017 at 2:20 PM, João Paulo Rechi Vita <jprvita@...il.com> wrote:
>> On 27 January 2017 at 10:26, Andy Shevchenko <andy.shevchenko@...il.com> wrote:
>>> On Thu, Jan 26, 2017 at 5:00 PM, João Paulo Rechi Vita
>>> <jprvita@...il.com> wrote:
>
>>>> +static const struct acpi_device_id device_ids[] = {
>>>> +       {"ATK4001", 0},
>>>> +       {"ATK4002", 0},
>>>
>>> ...and use it as a parameter here.
>>>
>>
>> I'm not exactly sure how to do that, as driver_data is a
>> kernel_ulong_t. Can you please elaborate a bit more?
>
> {"ATK4001", (kernel_ulong_t)atk4001_id_params},
>

The code you suggested:

static const struct hswc_params atk4001_id_params = {0x0, 0x1, 0x2};
static const struct acpi_device_id device_ids[] = {
       {"ATK4001", (kernel_ulong_t)atk4001_id_params},
       {"", 0},
};

does not compile: "drivers/platform/x86/asus-wireless.c:44:2: error:
aggregate value used where an integer was expected", so I guess you
meant the address of that struct (&atk4001_id_params), right? I don't
see any way how we could have the actual data in .driver_data.

Even after moving the parameters in the driver_data field of
device_ids[], I'm not able retrieve them with acpi_match_device(),
because the "struct device" from the "struct acpi_device" that comes
as an input parameter in asus_wireless_add() does not have a acpi
companion device associated with it, so acpi_match_device() returns
NULL. I still need to manually loop through device_ids[] in order to
retrieve the .driver_data associated with the HID, and I see the same
pattern in the i2c-scmi driver.

I'm sending the next revision for feedback, please advise if I'm
missing any detail, or if you want this implemented differently.

--
João Paulo Rechi Vita
http://about.me/jprvita