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

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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@xxxxxxxxxxxxx>
Reference: https://bugzilla.kernel.org/show_bug.cgi?id=67351
Cc: 3.8+ <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Lan Tianyu <tianyu.lan@xxxxxxxxx>
---
  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@xxxxxxx>");
  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
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