ACPI / Battery: Add a _BIX quirk for NEC LZ750/LS

commit a90b40385735af0d3031f98e97b439e8944a31b3 upstream.

The AML method _BIX of NEC LZ750/LS returns a broken package which
skips the first member "Revision" (ACPI 5.0, Table 10-234).

Add a quirk for this machine to skip member "Revision" during parsing
the package returned by _BIX.

Reference: https://bugzilla.kernel.org/show_bug.cgi?id=67351
Reported-and-tested-by: Francisco Castro <fcr@adinet.com.uy>
Signed-off-by: Lan Tianyu <tianyu.lan@intel.com>
Reviewed-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 20 insertions, 1 deletions

diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c
index 95332717e4f5..99427d7307af 100644
--- a/drivers/acpi/battery.c
+++ b/drivers/acpi/battery.c
@@ -68,6 +68,7 @@ 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");
@@ -443,7 +444,12 @@ 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));
@@ -1064,6 +1070,17 @@ static int battery_notify(struct notifier_block *nb,
         return 0;
 }
 
+static struct dmi_system_id bat_dmi_table[] = {
+        {
+                .ident = "NEC LZ750/LS",
+                .matches = {
+                        DMI_MATCH(DMI_SYS_VENDOR, "NEC"),
+                        DMI_MATCH(DMI_PRODUCT_NAME, "PC-LZ750LS"),
+                },
+        },
+        {},
+};
+
 static int acpi_battery_add(struct acpi_device *device)
 {
         int result = 0;
@@ -1174,6 +1191,8 @@ static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
         if (!acpi_battery_dir)
                 return;
 #endif
+        if (dmi_check_system(bat_dmi_table))
+                battery_bix_broken_package = 1;
         if (acpi_bus_register_driver(&acpi_battery_driver) < 0) {
 #ifdef CONFIG_ACPI_PROCFS_POWER
                 acpi_unlock_battery_dir(acpi_battery_dir);