[PATCH 2/2] platform/x86: int3472: Handle GPIO type 0x10 (DOVDD) for OV5675

[Leif Skunberg <diamondback@cohunt.app>]

The Lenovo ThinkPad X1 Fold 16 Gen 1 has an OV5675 sensor (ACPI HID
OVTI5675) behind an INT3472 discrete PMIC controller. The INT3472
_DSM returns GPIO type 0x10 for one of the pins, which controls the
DOVDD (digital I/O power) regulator enable.

Type 0x10 is not currently handled by the driver, causing the GPIO to
be ignored with a warning. Add INT3472_GPIO_TYPE_DOVDD (0x10) and
handle it by:

1. Adding an entry to int3472_gpio_map[] that maps the DOVDD type to
   INT3472_GPIO_TYPE_POWER_ENABLE for the OVTI5675 HID. The con_id
   is set to "vio" because "dovdd" exceeds GPIO_SUPPLY_NAME_LENGTH.

2. Adding a fallback case in int3472_get_con_id_and_polarity() so
   devices without a gpio_map match still get a valid con_id.

3. Adding INT3472_GPIO_TYPE_DOVDD to both switch statements in
   skl_int3472_handle_gpio_resources() so the GPIO is acquired via
   temp lookup and registered as a regulator.

Signed-off-by: Leif Skunberg <diamondback@cohunt.app>
---
 drivers/platform/x86/intel/int3472/discrete.c | 14 ++++++++++++++
 include/linux/platform_data/x86/int3472.h     |  1 +
 2 files changed, 15 insertions(+)

diff --git a/drivers/platform/x86/intel/int3472/discrete.c b/drivers/platform/x86/intel/int3472/discrete.c
index 1505fc3ef..0a293e73c 100644
--- a/drivers/platform/x86/intel/int3472/discrete.c
+++ b/drivers/platform/x86/intel/int3472/discrete.c
@@ -164,6 +164,13 @@ static const struct int3472_gpio_map int3472_gpio_map[] = {
 		.con_id = "dvdd",
 		.enable_time_us = 45 * USEC_PER_MSEC,
 	},
+	{	/* ov5675: DOVDD is a power regulator enable */
+		.hid = "OVTI5675",
+		.type_from = INT3472_GPIO_TYPE_DOVDD,
+		.type_to = INT3472_GPIO_TYPE_POWER_ENABLE,
+		.con_id = "vio",
+		.enable_time_us = GPIO_REGULATOR_ENABLE_TIME,
+	},
 };
 
 static void int3472_get_con_id_and_polarity(struct int3472_discrete_device *int3472, u8 *type,
@@ -223,6 +230,10 @@ static void int3472_get_con_id_and_polarity(struct int3472_discrete_device *int3
 		*con_id = "avdd";
 		*gpio_flags = GPIO_ACTIVE_HIGH;
 		break;
+	case INT3472_GPIO_TYPE_DOVDD:
+		*con_id = "vio";
+		*gpio_flags = GPIO_ACTIVE_HIGH;
+		break;
 	case INT3472_GPIO_TYPE_HANDSHAKE:
 		*con_id = "dvdd";
 		*gpio_flags = GPIO_ACTIVE_HIGH;
@@ -251,6 +262,7 @@ static void int3472_get_con_id_and_polarity(struct int3472_discrete_device *int3
  * 0x0b Power enable
  * 0x0c Clock enable
  * 0x0d Privacy LED
+ * 0x10 DOVDD (digital I/O voltage)
  * 0x13 Hotplug detect
  *
  * There are some known platform specific quirks where that does not quite
@@ -332,6 +344,7 @@ static int skl_int3472_handle_gpio_resources(struct acpi_resource *ares,
 	case INT3472_GPIO_TYPE_CLK_ENABLE:
 	case INT3472_GPIO_TYPE_PRIVACY_LED:
 	case INT3472_GPIO_TYPE_POWER_ENABLE:
+	case INT3472_GPIO_TYPE_DOVDD:
 	case INT3472_GPIO_TYPE_HANDSHAKE:
 		gpio = skl_int3472_gpiod_get_from_temp_lookup(int3472, agpio, con_id, gpio_flags);
 		if (IS_ERR(gpio)) {
@@ -356,6 +369,7 @@ static int skl_int3472_handle_gpio_resources(struct acpi_resource *ares,
 		case INT3472_GPIO_TYPE_POWER_ENABLE:
 			second_sensor = int3472->quirks.avdd_second_sensor;
 			fallthrough;
+		case INT3472_GPIO_TYPE_DOVDD:
 		case INT3472_GPIO_TYPE_HANDSHAKE:
 			ret = skl_int3472_register_regulator(int3472, gpio, enable_time_us,
 							     con_id, second_sensor);
diff --git a/include/linux/platform_data/x86/int3472.h b/include/linux/platform_data/x86/int3472.h
index b1b837583..d72c621f7 100644
--- a/include/linux/platform_data/x86/int3472.h
+++ b/include/linux/platform_data/x86/int3472.h
@@ -26,6 +26,7 @@
 #define INT3472_GPIO_TYPE_POWER_ENABLE				0x0b
 #define INT3472_GPIO_TYPE_CLK_ENABLE				0x0c
 #define INT3472_GPIO_TYPE_PRIVACY_LED				0x0d
+#define INT3472_GPIO_TYPE_DOVDD					0x10
 #define INT3472_GPIO_TYPE_HANDSHAKE				0x12
 #define INT3472_GPIO_TYPE_HOTPLUG_DETECT			0x13
 
-- 
2.53.0