[PATCH v4 4/4] platform/x86: int3472: Add support for GPIO type 0x02 (strobe LED)

[Marco Nenciarini <mnencia@kcore.it>]

Some ACPI INT3472 devices include a GPIO with DSM type 0x02, used for
IR flood (strobe) illumination. This GPIO type was previously
unhandled, resulting in the following warning during probe:

  int3472-discrete INT3472:00: GPIO type 0x02 unknown; the sensor
  may not work

Add INT3472_GPIO_TYPE_STROBE (0x02) handling that registers the GPIO
as an LED class device via skl_int3472_register_led(). Unlike the
privacy LED, the strobe LED is not consumed by the sensor driver, so
no LED lookup is registered.

Signed-off-by: Marco Nenciarini <mnencia@kcore.it>
---
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
 drivers/platform/x86/intel/int3472/discrete.c | 13 +++++++++++++
 drivers/platform/x86/intel/int3472/led.c      |  2 ++
 include/linux/platform_data/x86/int3472.h     |  2 ++
 3 files changed, 17 insertions(+)

diff --git a/drivers/platform/x86/intel/int3472/discrete.c b/drivers/platform/x86/intel/int3472/discrete.c
index 2c554a0..03f0b49 100644
--- a/drivers/platform/x86/intel/int3472/discrete.c
+++ b/drivers/platform/x86/intel/int3472/discrete.c
@@ -207,6 +207,10 @@ static void int3472_get_con_id_and_polarity(struct int3472_discrete_device *int3
 		*con_id = "powerdown";
 		*gpio_flags = GPIO_ACTIVE_LOW;
 		break;
+	case INT3472_GPIO_TYPE_STROBE:
+		*con_id = "strobe";
+		*gpio_flags = GPIO_ACTIVE_HIGH;
+		break;
 	case INT3472_GPIO_TYPE_CLK_ENABLE:
 		*con_id = "clk-enable";
 		*gpio_flags = GPIO_ACTIVE_HIGH;
@@ -248,6 +252,7 @@ static void int3472_get_con_id_and_polarity(struct int3472_discrete_device *int3
  *
  * 0x00 Reset
  * 0x01 Power down
+ * 0x02 Strobe (IR flood LED)
  * 0x0b Power enable
  * 0x0c Clock enable
  * 0x0d Privacy LED
@@ -329,6 +334,7 @@ static int skl_int3472_handle_gpio_resources(struct acpi_resource *ares,
 			err_msg = "Failed to map GPIO pin to sensor\n";
 
 		break;
+	case INT3472_GPIO_TYPE_STROBE:
 	case INT3472_GPIO_TYPE_CLK_ENABLE:
 	case INT3472_GPIO_TYPE_PRIVACY_LED:
 	case INT3472_GPIO_TYPE_POWER_ENABLE:
@@ -353,6 +359,13 @@ static int skl_int3472_handle_gpio_resources(struct acpi_resource *ares,
 			if (ret)
 				err_msg = "Failed to register privacy LED\n";
 
+			break;
+		case INT3472_GPIO_TYPE_STROBE:
+			ret = skl_int3472_register_led(int3472, gpio,
+						       INT3472_LED_TYPE_STROBE);
+			if (ret)
+				err_msg = "Failed to register strobe LED\n";
+
 			break;
 		case INT3472_GPIO_TYPE_POWER_ENABLE:
 			second_sensor = int3472->quirks.avdd_second_sensor;
diff --git a/drivers/platform/x86/intel/int3472/led.c b/drivers/platform/x86/intel/int3472/led.c
index 33b30f3..e6faba4 100644
--- a/drivers/platform/x86/intel/int3472/led.c
+++ b/drivers/platform/x86/intel/int3472/led.c
@@ -8,10 +8,12 @@
 
 static const char * const int3472_led_names[] = {
 	[INT3472_LED_TYPE_PRIVACY] = "privacy",
+	[INT3472_LED_TYPE_STROBE]  = "strobe",
 };
 
 static const char * const int3472_led_con_ids[] = {
 	[INT3472_LED_TYPE_PRIVACY] = "privacy",
+	[INT3472_LED_TYPE_STROBE]  = NULL,
 };
 
 static int int3472_led_set(struct led_classdev *led_cdev,
diff --git a/include/linux/platform_data/x86/int3472.h b/include/linux/platform_data/x86/int3472.h
index b6b5b36..9893711 100644
--- a/include/linux/platform_data/x86/int3472.h
+++ b/include/linux/platform_data/x86/int3472.h
@@ -23,6 +23,7 @@
 /* PMIC GPIO Types */
 #define INT3472_GPIO_TYPE_RESET					0x00
 #define INT3472_GPIO_TYPE_POWERDOWN				0x01
+#define INT3472_GPIO_TYPE_STROBE				0x02
 #define INT3472_GPIO_TYPE_POWER_ENABLE				0x0b
 #define INT3472_GPIO_TYPE_CLK_ENABLE				0x0c
 #define INT3472_GPIO_TYPE_PRIVACY_LED				0x0d
@@ -71,6 +72,7 @@
 
 enum int3472_led_type {
 	INT3472_LED_TYPE_PRIVACY,
+	INT3472_LED_TYPE_STROBE,
 };
 
 struct acpi_device;
-- 
2.47.3