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SubjectRe: [PATCH v3 2/6] platform/x86: huawei-wmi: Add quirks and module parameters
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Hi,

On 20-09-2019 08:08, Greg Kroah-Hartman wrote:
> On Thu, Sep 19, 2019 at 08:39:07PM -0400, Ayman Bagabas wrote:
>> Introduce quirks and module parameters. 3 quirks are added:
>> 1. Fixes reporting brightness keys twice since it's already handled by
>> acpi-video.
>> 2. Some models need a short delay when setting battery thresholds to
>> prevent a race condition when two processes read/write. (will be used later)
>> 3. Matebook X (2017) handles micmute led through the "legacy" interface
>> which is not currently implemented. Use ACPI EC method to control
>> this led. (will be used later)
>>
>> 2 module parameters are added to enable this short delay and/or report
>> brightness keys through this driver.
>
> module parameters are a pain to manage and handle over time. Is there
> any way you can "automatically" figure this out, or use a sysfs file
> instead?

The patch also adds dmi matches to set the quirks, so the module params
are there to override those and/or to easily test which are the right options
with new modules. The normal / expected use-case for everything to be set
automatically based on the DMI table.

With that said, the module-params should really always override the dmi values,
so I would like to suggest to make the module-params int-s instead of bool-s
and to do something like this:

static int battery_reset = -1;
static int report_brightness = -1;

quirks = &quirk_unknown;
dmi_check_system(huawei_quirks);
/* If set the module options override the vale from the DMI table */
if (battery_reset != -1)
quirks->battery_reset = battery_reset;
if (report_brightness != -1)
quirks->report_brightness = report_brightness;

Regards,

Hans


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