[PATCH 1/4] platform/x86: x86-android-tablets: Fix keyboard touchscreen on Lenovo Yogabook1 X90

[Hans de Goede <hdegoede@redhat.com>]

After commit 4014ae236b1d ("platform/x86: x86-android-tablets: Stop using
gpiolib private APIs") the touchscreen in the keyboard half of
the Lenovo Yogabook1 X90 stopped working with the following error:

 Goodix-TS i2c-goodix_ts: error -EBUSY: Failed to get irq GPIO

The problem is that when getting the IRQ for instantiated i2c_client-s
from a GPIO (rather then using an IRQ directly from the IOAPIC),
x86_acpi_irq_helper_get() now properly requests the GPIO, which disallows
other drivers from requesting it. Normally this is a good thing, but
the goodix touchscreen also uses the IRQ as an output during reset
to select which of its 2 possible I2C addresses should be used.

Add a new free_gpio flag to struct x86_acpi_irq_data to deal with this
and release the GPIO after getting the IRQ in this special case.

Fixes: 4014ae236b1d ("platform/x86: x86-android-tablets: Stop using gpiolib private APIs")
Cc: stable@vger.kernel.org
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
 drivers/platform/x86/x86-android-tablets/core.c                | 3 +++
 drivers/platform/x86/x86-android-tablets/lenovo.c              | 1 +
 drivers/platform/x86/x86-android-tablets/x86-android-tablets.h | 1 +
 3 files changed, 5 insertions(+)

diff --git a/drivers/platform/x86/x86-android-tablets/core.c b/drivers/platform/x86/x86-android-tablets/core.c
index f8221a15575b..f6547c9d7584 100644
--- a/drivers/platform/x86/x86-android-tablets/core.c
+++ b/drivers/platform/x86/x86-android-tablets/core.c
@@ -113,6 +113,9 @@ int x86_acpi_irq_helper_get(const struct x86_acpi_irq_data *data)
 		if (irq_type != IRQ_TYPE_NONE && irq_type != irq_get_trigger_type(irq))
 			irq_set_irq_type(irq, irq_type);
 
+		if (data->free_gpio)
+			devm_gpiod_put(&x86_android_tablet_device->dev, gpiod);
+
 		return irq;
 	case X86_ACPI_IRQ_TYPE_PMIC:
 		status = acpi_get_handle(NULL, data->chip, &handle);
diff --git a/drivers/platform/x86/x86-android-tablets/lenovo.c b/drivers/platform/x86/x86-android-tablets/lenovo.c
index f1c66a61bfc5..c297391955ad 100644
--- a/drivers/platform/x86/x86-android-tablets/lenovo.c
+++ b/drivers/platform/x86/x86-android-tablets/lenovo.c
@@ -116,6 +116,7 @@ static const struct x86_i2c_client_info lenovo_yb1_x90_i2c_clients[] __initconst
 			.trigger = ACPI_EDGE_SENSITIVE,
 			.polarity = ACPI_ACTIVE_LOW,
 			.con_id = "goodix_ts_irq",
+			.free_gpio = true,
 		},
 	}, {
 		/* Wacom Digitizer in keyboard half */
diff --git a/drivers/platform/x86/x86-android-tablets/x86-android-tablets.h b/drivers/platform/x86/x86-android-tablets/x86-android-tablets.h
index 49fed9410adb..468993edfeee 100644
--- a/drivers/platform/x86/x86-android-tablets/x86-android-tablets.h
+++ b/drivers/platform/x86/x86-android-tablets/x86-android-tablets.h
@@ -39,6 +39,7 @@ struct x86_acpi_irq_data {
 	int index;
 	int trigger;  /* ACPI_EDGE_SENSITIVE / ACPI_LEVEL_SENSITIVE */
 	int polarity; /* ACPI_ACTIVE_HIGH / ACPI_ACTIVE_LOW / ACPI_ACTIVE_BOTH */
+	bool free_gpio; /* Release GPIO after getting IRQ (for TYPE_GPIOINT) */
 	const char *con_id;
 };
 
-- 
2.43.0