Re: [PATCH] ACPI/Battery: Add a _BIX quirk for NEC LZ750/LS

[Lan Tianyu <tianyu.lan@intel.com>]

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@adinet.com.uy>
>>> Reference: https://bugzilla.kernel.org/show_bug.cgi?id=67351
>>> Cc: 3.8+ <stable@vger.kernel.org>
>>> Signed-off-by: Lan Tianyu <tianyu.lan@intel.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@suse.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.).

-- 
Best Regards
Tianyu Lan