linux-kernel - [RFC 3/5] gpiolib: acpi: Add a new "ignore" module option

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Date:   Sun, 31 Oct 2021 17:24:26 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Mark Gross <markgross@...nel.org>,
        Andy Shevchenko <andy@...radead.org>,
        Wolfram Sang <wsa@...-dreams.de>,
        Sebastian Reichel <sre@...nel.org>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Ard Biesheuvel <ardb@...nel.org>
Cc:     Hans de Goede <hdegoede@...hat.com>, Len Brown <lenb@...nel.org>,
        linux-acpi@...r.kernel.org, Yauhen Kharuzhy <jekhor@...il.com>,
        Tsuchiya Yuto <kitakar@...il.com>,
        platform-driver-x86@...r.kernel.org, linux-i2c@...r.kernel.org,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-efi@...r.kernel.org
Subject: [RFC 3/5] gpiolib: acpi: Add a new "ignore" module option

Add a new "ignore" module option to completely ignore controller@pin combos
from _AEI lists.

And add a DMI quirk to ignore the interrupt of the BQ27520 fuel-gauge IC
on the Xiaomi Mi Pad 2. On this device we use native charger + fuel-gauge
drivers because of issues with the ACPI battery implementation. The _AEI
listing of the fuel-gauge IRQ is intended for use with the unused ACPI
battery implementation and is blocking the bq27xxx fuel-gauge driver
from binding.

Signed-off-by: Hans de Goede <hdegoede@...hat.com>
---
 drivers/gpio/gpiolib-acpi.c | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
index 342219a58a32..2d08f33a22a6 100644
--- a/drivers/gpio/gpiolib-acpi.c
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -32,9 +32,16 @@ MODULE_PARM_DESC(ignore_wake,
 		 "controller@pin combos on which to ignore the ACPI wake flag "
 		 "ignore_wake=controller@pin[,controller@pin[,...]]");
 
+static char *ignore;
+module_param(ignore, charp, 0444);
+MODULE_PARM_DESC(ignore,
+		 "controller@pin combos which are to be ignored from _AEI lists "
+		 "ignore=controller@pin[,controller@pin[,...]]");
+
 struct acpi_gpiolib_dmi_quirk {
 	bool no_edge_events_on_boot;
 	char *ignore_wake;
+	char *ignore;
 };
 
 /**
@@ -407,6 +414,11 @@ static acpi_status acpi_gpiochip_alloc_event(struct acpi_resource *ares,
 	if (!handler)
 		return AE_OK;
 
+	if (acpi_gpio_in_ignore_list(ignore, dev_name(chip->parent), pin)) {
+		dev_info(chip->parent, "Ignoring _AEI entry for pin %d\n", pin);
+		return AE_OK;
+	}
+
 	desc = acpi_request_own_gpiod(chip, agpio, 0, "ACPI:Event");
 	if (IS_ERR(desc)) {
 		dev_err(chip->parent,
@@ -1565,6 +1577,19 @@ static const struct dmi_system_id gpiolib_acpi_quirks[] __initconst = {
 			.ignore_wake = "INT33FF:01@0",
 		},
 	},
+	{
+		/*
+		 * On the Xiaomi Mi Pad 2 we use native battery drivers, disable
+		 * the _AEI entry for the fuel-gauge IRQ.
+		 */
+		.matches = {
+			DMI_MATCH(DMI_SYS_VENDOR, "Xiaomi Inc"),
+			DMI_MATCH(DMI_PRODUCT_NAME, "Mipad2"),
+		},
+		.driver_data = &(struct acpi_gpiolib_dmi_quirk) {
+			.ignore = "INT33FF:03@52",
+		},
+	},
 	{} /* Terminating entry */
 };
 
@@ -1587,6 +1612,9 @@ static int __init acpi_gpio_setup_params(void)
 	if (ignore_wake == NULL && quirk && quirk->ignore_wake)
 		ignore_wake = quirk->ignore_wake;
 
+	if (ignore == NULL && quirk && quirk->ignore)
+		ignore = quirk->ignore;
+
 	return 0;
 }
 
-- 
2.31.1