linux-kernel - Re: [PATCH] ACPI/Battery: Add a

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Date:	Mon, 06 Jan 2014 15:32:37 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Lan Tianyu <tianyu.lan@...el.com>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Leandro Dorileo <l@...ileo.org>, lenb@...nel.org,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	fcr@...net.com.uy, "3.8+" <stable@...r.kernel.org>
Subject: Re: [PATCH] ACPI/Battery: Add a _BIX quirk for NEC LZ750/LS

On Monday, January 06, 2014 10:07:35 PM Lan Tianyu wrote:
> On 01/04/2014 07:12 AM, Dmitry Torokhov wrote:
> > On Fri, Jan 03, 2014 at 05:01:11PM -0200, Leandro Dorileo wrote:
> >> On Thu, Jan 02, 2014 at 03:37:57PM +0800, Lan Tianyu wrote:
> >>> The aml method _BIX of NEC LZ750/LS returns a broken package which
> >>> skip the first member "Revision" according ACPI 5.0 spec Table 10-234.
> >>>
> >>> This patch is to add a quirk for this machine to skip member "Revision"
> >>> during parsing _BIX returned package.
> >>>
> >>> Reported-and-tested-by: Francisco Castro <fcr@...net.com.uy>
> >>> Reference: https://bugzilla.kernel.org/show_bug.cgi?id=67351
> >>> Cc: 3.8+ <stable@...r.kernel.org>
> >>> Signed-off-by: Lan Tianyu <tianyu.lan@...el.com>
> >>> ---
> >>>   drivers/acpi/battery.c |   28 +++++++++++++++++++++++++++-
> >>>   1 file changed, 27 insertions(+), 1 deletion(-)
> >>>
> >>> diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c
> >>> index fbf1ace..3d64a87 100644
> >>> --- a/drivers/acpi/battery.c
> >>> +++ b/drivers/acpi/battery.c
> >>> @@ -62,6 +62,7 @@ MODULE_AUTHOR("Alexey Starikovskiy <astarikovskiy@...e.de>");
> >>>   MODULE_DESCRIPTION("ACPI Battery Driver");
> >>>   MODULE_LICENSE("GPL");
> >>>
> >>> +static int battery_bix_broken_package;
> >>>   static unsigned int cache_time = 1000;
> >>>   module_param(cache_time, uint, 0644);
> >>>   MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
> >>> @@ -416,7 +417,12 @@ static int acpi_battery_get_info(struct acpi_battery *battery)
> >>>   		ACPI_EXCEPTION((AE_INFO, status, "Evaluating %s", name));
> >>>   		return -ENODEV;
> >>>   	}
> >>> -	if (test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags))
> >>> +
> >>> +	if (battery_bix_broken_package)
> >>> +		result = extract_package(battery, buffer.pointer,
> >>> +				extended_info_offsets + 1,
> >>> +				ARRAY_SIZE(extended_info_offsets) - 1);
> >>> +	else if (test_bit(ACPI_BATTERY_XINFO_PRESENT, &battery->flags))
> >>>   		result = extract_package(battery, buffer.pointer,
> >>>   				extended_info_offsets,
> >>>   				ARRAY_SIZE(extended_info_offsets));
> >>> @@ -754,6 +760,24 @@ static int battery_notify(struct notifier_block *nb,
> >>>   	return 0;
> >>>   }
> >>>
> >>> +static int battery_bix_package_quirk(const struct dmi_system_id *id)
> >>> +{
> >>> +	battery_bix_broken_package = 1;
> >>> +	return 0;
> >>> +}
> >>> +
> >>
> >>
> >> Do you really need this callback? Why don't you just do:
> >>
> >> if (dmi_check_system(bat_dmi_table))
> >>         battery_bix_broken_package = 1;
> >>
> >
> > Callback would be useful if we were to print the DMI data of the match,
> > otherwise not so much.
> >
> 
> Hi Leandro & Dmitry:
> 	Thanks for your review. I select to callback mode as it's convenient to 
> add a new quirk for other machines if need. This Just likes what we have 
> done for the other ACPI drivers(E,G ac, processor_idle, video, thermal 
> and so on.).

We can switch to callbacks when we actually need them.  Please keep things
as simple as reasonably possible.

Thanks!

-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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