ACPI / x86: Introduce an acpi_quirk_skip_acpi_ac_and_battery() helper

Some x86 ACPI boards have broken AC and battery ACPI devices in their ACPI
tables. This is often tied to these devices using certain PMICs where the
factory OS image seems to be using native charger and fuel-gauge drivers
instead.

So far both the AC and battery drivers have almost identical checks for
these PMICs including both of them having a DMI based mechanism to force
usage of the ACPI AC and battery drivers on some boards even though one
of these PMICs is present, with the same 2 boards listed in both driver's
DMI tables for this.

The only difference is that the AC driver checks for 2 PMICs and the
battery driver only for one. This has grown this way because the other
(Whiskey Cove) PMIC is only used on a few boards (3 known boards) and
although some of these do have non working ACPI battery devices, their
_STA method always returns 0, but that really should not be relied on.

This patch factors out the shared checks into a new
acpi_quirk_skip_acpi_ac_and_battery() helper and moves the AC and
battery drivers over to this new helper.

Note the DMI table is shared with acpi_quirk_skip_i2c_client_enumeration()
and acpi_quirk_skip_serdev_enumeration(), because boards needing DMI quirks
for either of these typically also have broken AC and battery ACPI devices.

The ACPI_QUIRK_SKIP_ACPI_AC_AND_BATTERY quirk is not set yet on boards
already in this DMI table, to avoid introducing any functional changes
in this refactoring patch.

Besided sharing the code between the AC and battery drivers this
refactoring also moves this quirk handling to under #ifdef CONFIG_X86,
removing this x86 specific code from non x86 ACPI builds.

Signed-off-by: Hans de Goede <[e-mail]>
Signed-off-by: Rafael J. Wysocki <[e-mail]>

drivers/acpi/ac.c

···
 };
 MODULE_DEVICE_TABLE(acpi, ac_device_ids);
 
-/* Lists of PMIC ACPI HIDs with an (often better) native charger driver */
-static const struct acpi_ac_bl acpi_ac_blacklist[] = {
-	{ "INT33F4", -1 }, /* X-Powers AXP288 PMIC */
-	{ "INT34D3",  3 }, /* Intel Cherrytrail Whiskey Cove PMIC */
-};
-
 #ifdef CONFIG_PM_SLEEP
 static int acpi_ac_resume(struct device *dev);
 #endif
 static SIMPLE_DEV_PM_OPS(acpi_ac_pm, NULL, acpi_ac_resume);
 
 static int ac_sleep_before_get_state_ms;
-static int ac_check_pmic = 1;
 static int ac_only;
 
 static struct acpi_driver acpi_ac_driver = {
···
 	return 0;
 }
 
-static int __init ac_do_not_check_pmic_quirk(const struct dmi_system_id *d)
-{
-	ac_check_pmic = 0;
-	return 0;
-}
-
 static int __init ac_only_quirk(const struct dmi_system_id *d)
 {
 	ac_only = 1;
···
 /* Please keep this list alphabetically sorted */
 static const struct dmi_system_id ac_dmi_table[]  __initconst = {
 	{
-		/* ECS EF20EA, AXP288 PMIC but uses separate fuel-gauge */
-		.callback = ac_do_not_check_pmic_quirk,
-		.matches = {
-			DMI_MATCH(DMI_PRODUCT_NAME, "EF20EA"),
-		},
-	},
-	{
 		/* Kodlix GK45 returning incorrect state */
 		.callback = ac_only_quirk,
 		.matches = {
 			DMI_MATCH(DMI_PRODUCT_NAME, "GK45"),
-		},
-	},
-	{
-		/* Lenovo Ideapad Miix 320, AXP288 PMIC, separate fuel-gauge */
-		.callback = ac_do_not_check_pmic_quirk,
-		.matches = {
-			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
-			DMI_MATCH(DMI_PRODUCT_NAME, "80XF"),
-			DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo MIIX 320-10ICR"),
 		},
 	},
 	{
···
 
 static int __init acpi_ac_init(void)
 {
-	unsigned int i;
 	int result;
 
 	if (acpi_disabled)
 		return -ENODEV;
 
-	dmi_check_system(ac_dmi_table);
+	if (acpi_quirk_skip_acpi_ac_and_battery())
+		return -ENODEV;
 
-	if (ac_check_pmic) {
-		for (i = 0; i < ARRAY_SIZE(acpi_ac_blacklist); i++)
-			if (acpi_dev_present(acpi_ac_blacklist[i].hid, "1",
-					     acpi_ac_blacklist[i].hrv)) {
-				pr_info("found native %s PMIC, not loading\n",
-					acpi_ac_blacklist[i].hid);
-				return -ENODEV;
-			}
-	}
+	dmi_check_system(ac_dmi_table);
 
 	result = acpi_bus_register_driver(&acpi_ac_driver);
 	if (result < 0)

drivers/acpi/battery.c

···
 static int battery_bix_broken_package;
 static int battery_notification_delay_ms;
 static int battery_ac_is_broken;
-static int battery_check_pmic = 1;
 static unsigned int cache_time = 1000;
 module_param(cache_time, uint, 0644);
 MODULE_PARM_DESC(cache_time, "cache time in milliseconds");
···
 };
 
 MODULE_DEVICE_TABLE(acpi, battery_device_ids);
-
-/* Lists of PMIC ACPI HIDs with an (often better) native battery driver */
-static const char * const acpi_battery_blacklist[] = {
-	"INT33F4", /* X-Powers AXP288 PMIC */
-};
 
 enum {
 	ACPI_BATTERY_ALARM_PRESENT,
···
 	return 0;
 }
 
-static int __init
-battery_do_not_check_pmic_quirk(const struct dmi_system_id *d)
-{
-	battery_check_pmic = 0;
-	return 0;
-}
-
 static const struct dmi_system_id bat_dmi_table[] __initconst = {
 	{
 		/* NEC LZ750/LS */
···
 			DMI_MATCH(DMI_BIOS_VERSION, "3BAIR1013"),
 			/* Above matches are too generic, add bios-date match */
 			DMI_MATCH(DMI_BIOS_DATE, "08/22/2014"),
-		},
-	},
-	{
-		/* ECS EF20EA, AXP288 PMIC but uses separate fuel-gauge */
-		.callback = battery_do_not_check_pmic_quirk,
-		.matches = {
-			DMI_MATCH(DMI_PRODUCT_NAME, "EF20EA"),
-		},
-	},
-	{
-		/* Lenovo Ideapad Miix 320, AXP288 PMIC, separate fuel-gauge */
-		.callback = battery_do_not_check_pmic_quirk,
-		.matches = {
-			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
-			DMI_MATCH(DMI_PRODUCT_NAME, "80XF"),
-			DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo MIIX 320-10ICR"),
 		},
 	},
 	{},
···
 
 static void __init acpi_battery_init_async(void *unused, async_cookie_t cookie)
 {
-	unsigned int i;
 	int result;
 
-	dmi_check_system(bat_dmi_table);
+	if (acpi_quirk_skip_acpi_ac_and_battery())
+		return;
 
-	if (battery_check_pmic) {
-		for (i = 0; i < ARRAY_SIZE(acpi_battery_blacklist); i++)
-			if (acpi_dev_present(acpi_battery_blacklist[i], "1", -1)) {
-				pr_info("found native %s PMIC, not loading\n",
-					acpi_battery_blacklist[i]);
-				return;
-			}
-	}
+	dmi_check_system(bat_dmi_table);
 
 	result = acpi_bus_register_driver(&acpi_battery_driver);
 	battery_driver_registered = (result == 0);

drivers/acpi/x86/utils.c

···
  * Copyright (C) 2013-2015 Intel Corporation. All rights reserved.
  */
 
+#define pr_fmt(fmt) "ACPI: " fmt
+
 #include <linux/acpi.h>
 #include <linux/dmi.h>
 #include <linux/platform_device.h>
···
 	return x86_match_cpu(storage_d3_cpu_ids);
 }
 
-#if IS_ENABLED(CONFIG_X86_ANDROID_TABLETS)
 /*
  * x86 ACPI boards which ship with only Android as their factory image usually
  * declare a whole bunch of bogus I2C devices in their ACPI tables and sometimes
···
  */
 #define ACPI_QUIRK_SKIP_I2C_CLIENTS				BIT(0)
 #define ACPI_QUIRK_UART1_TTY_UART2_SKIP				BIT(1)
+#define ACPI_QUIRK_SKIP_ACPI_AC_AND_BATTERY			BIT(2)
+#define ACPI_QUIRK_USE_ACPI_AC_AND_BATTERY			BIT(3)
 
-static const struct dmi_system_id acpi_skip_serial_bus_enumeration_ids[] = {
+static const struct dmi_system_id acpi_quirk_skip_dmi_ids[] = {
+	/*
+	 * 1. Devices with only the skip / don't-skip AC and battery quirks,
+	 *    sorted alphabetically.
+	 */
+	{
+		/* ECS EF20EA, AXP288 PMIC but uses separate fuel-gauge */
+		.matches = {
+			DMI_MATCH(DMI_PRODUCT_NAME, "EF20EA"),
+		},
+		.driver_data = (void *)ACPI_QUIRK_USE_ACPI_AC_AND_BATTERY
+	},
+	{
+		/* Lenovo Ideapad Miix 320, AXP288 PMIC, separate fuel-gauge */
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "80XF"),
+			DMI_MATCH(DMI_PRODUCT_VERSION, "Lenovo MIIX 320-10ICR"),
+		},
+		.driver_data = (void *)ACPI_QUIRK_USE_ACPI_AC_AND_BATTERY
+	},
+
+	/*
+	 * 2. Devices which also have the skip i2c/serdev quirks and which
+	 *    need the x86-android-tablets module to properly work.
+	 */
+#if IS_ENABLED(CONFIG_X86_ANDROID_TABLETS)
 	{
 		.matches = {
 			DMI_EXACT_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
···
 		},
 		.driver_data = (void *)ACPI_QUIRK_SKIP_I2C_CLIENTS,
 	},
+#endif
 	{}
 };
 
+#if IS_ENABLED(CONFIG_X86_ANDROID_TABLETS)
 static const struct acpi_device_id i2c_acpi_known_good_ids[] = {
 	{ "10EC5640", 0 }, /* RealTek ALC5640 audio codec */
 	{ "INT33F4", 0 },  /* X-Powers AXP288 PMIC */
···
 	const struct dmi_system_id *dmi_id;
 	long quirks;
 
-	dmi_id = dmi_first_match(acpi_skip_serial_bus_enumeration_ids);
+	dmi_id = dmi_first_match(acpi_quirk_skip_dmi_ids);
 	if (!dmi_id)
 		return false;
 
···
 	if (!adev || !adev->pnp.unique_id || !dev_is_platform(controller_parent))
 		return 0;
 
-	dmi_id = dmi_first_match(acpi_skip_serial_bus_enumeration_ids);
+	dmi_id = dmi_first_match(acpi_quirk_skip_dmi_ids);
 	if (dmi_id)
 		quirks = (unsigned long)dmi_id->driver_data;
 
···
 }
 EXPORT_SYMBOL_GPL(acpi_quirk_skip_serdev_enumeration);
 #endif
+
+/* Lists of PMIC ACPI HIDs with an (often better) native charger driver */
+static const struct {
+	const char *hid;
+	int hrv;
+} acpi_skip_ac_and_battery_pmic_ids[] = {
+	{ "INT33F4", -1 }, /* X-Powers AXP288 PMIC */
+	{ "INT34D3",  3 }, /* Intel Cherrytrail Whiskey Cove PMIC */
+};
+
+bool acpi_quirk_skip_acpi_ac_and_battery(void)
+{
+	const struct dmi_system_id *dmi_id;
+	long quirks = 0;
+	int i;
+
+	dmi_id = dmi_first_match(acpi_quirk_skip_dmi_ids);
+	if (dmi_id)
+		quirks = (unsigned long)dmi_id->driver_data;
+
+	if (quirks & ACPI_QUIRK_SKIP_ACPI_AC_AND_BATTERY)
+		return true;
+
+	if (quirks & ACPI_QUIRK_USE_ACPI_AC_AND_BATTERY)
+		return false;
+
+	for (i = 0; i < ARRAY_SIZE(acpi_skip_ac_and_battery_pmic_ids); i++) {
+		if (acpi_dev_present(acpi_skip_ac_and_battery_pmic_ids[i].hid, "1",
+				     acpi_skip_ac_and_battery_pmic_ids[i].hrv)) {
+			pr_info_once("found native %s PMIC, skipping ACPI AC and battery devices\n",
+				     acpi_skip_ac_and_battery_pmic_ids[i].hid);
+			return true;
+		}
+	}
+
+	return false;
+}
+EXPORT_SYMBOL_GPL(acpi_quirk_skip_acpi_ac_and_battery);

include/acpi/acpi_bus.h

···
 
 #ifdef CONFIG_X86
 bool acpi_device_override_status(struct acpi_device *adev, unsigned long long *status);
+bool acpi_quirk_skip_acpi_ac_and_battery(void);
 #else
 static inline bool acpi_device_override_status(struct acpi_device *adev,
 					       unsigned long long *status)
+{
+	return false;
+}
+static inline bool acpi_quirk_skip_acpi_ac_and_battery(void)
 {
 	return false;
 }