platform/x86: int3472/discrete: Create a LED class device for the privacy LED

On some systems, e.g. the Lenovo ThinkPad X1 Yoga gen 7 and the ThinkPad
X1 Nano gen 2 there is no clock-enable pin, triggering the:
"No clk GPIO. The privacy LED won't work" warning and causing the privacy
LED to not work.

Fix this by modeling the privacy LED as a LED class device rather then
integrating it with the registered clock.

Note this relies on media subsys changes to actually turn the LED on/off
when the sensor's v4l2_subdev's s_stream() operand gets called.

Signed-off-by: Hans de Goede <[email protected]>
Reviewed-by: Sakari Ailus <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

1 files changed, 16 insertions, 42 deletions

diff --git a/drivers/platform/x86/intel/int3472/discrete.c b/drivers/platform/x86/intel/int3472/discrete.c
index 708d51f9b41d..38b1372e0745 100644
--- a/drivers/platform/x86/intel/int3472/discrete.c
+++ b/drivers/platform/x86/intel/int3472/discrete.c
@@ -155,37 +155,21 @@ static int skl_int3472_map_gpio_to_sensor(struct int3472_discrete_device *int347
 }
 
 static int skl_int3472_map_gpio_to_clk(struct int3472_discrete_device *int3472,
-				       struct acpi_resource_gpio *agpio, u8 type)
+				       struct acpi_resource_gpio *agpio)
 {
 	char *path = agpio->resource_source.string_ptr;
 	u16 pin = agpio->pin_table[0];
 	struct gpio_desc *gpio;
 
-	switch (type) {
-	case INT3472_GPIO_TYPE_CLK_ENABLE:
-		gpio = acpi_get_and_request_gpiod(path, pin, "int3472,clk-enable");
-		if (IS_ERR(gpio))
-			return (PTR_ERR(gpio));
-
-		int3472->clock.ena_gpio = gpio;
-		/* Ensure the pin is in output mode and non-active state */
-		gpiod_direction_output(int3472->clock.ena_gpio, 0);
-		break;
-	case INT3472_GPIO_TYPE_PRIVACY_LED:
-		gpio = acpi_get_and_request_gpiod(path, pin, "int3472,privacy-led");
-		if (IS_ERR(gpio))
-			return (PTR_ERR(gpio));
+	gpio = acpi_get_and_request_gpiod(path, pin, "int3472,clk-enable");
+	if (IS_ERR(gpio))
+		return (PTR_ERR(gpio));
 
-		int3472->clock.led_gpio = gpio;
-		/* Ensure the pin is in output mode and non-active state */
-		gpiod_direction_output(int3472->clock.led_gpio, 0);
-		break;
-	default:
-		dev_err(int3472->dev, "Invalid GPIO type 0x%02x for clock\n", type);
-		break;
-	}
+	int3472->clock.ena_gpio = gpio;
+	/* Ensure the pin is in output mode and non-active state */
+	gpiod_direction_output(int3472->clock.ena_gpio, 0);
 
-	return 0;
+	return skl_int3472_register_clock(int3472);
 }
 
 static void int3472_get_func_and_polarity(u8 type, const char **func, u32 *polarity)
@@ -293,12 +277,17 @@ static int skl_int3472_handle_gpio_resources(struct acpi_resource *ares,
 
 		break;
 	case INT3472_GPIO_TYPE_CLK_ENABLE:
-	case INT3472_GPIO_TYPE_PRIVACY_LED:
-		ret = skl_int3472_map_gpio_to_clk(int3472, agpio, type);
+		ret = skl_int3472_map_gpio_to_clk(int3472, agpio);
 		if (ret)
 			err_msg = "Failed to map GPIO to clock\n";
 
 		break;
+	case INT3472_GPIO_TYPE_PRIVACY_LED:
+		ret = skl_int3472_register_pled(int3472, agpio, polarity);
+		if (ret)
+			err_msg = "Failed to register LED\n";
+
+		break;
 	case INT3472_GPIO_TYPE_POWER_ENABLE:
 		ret = skl_int3472_register_regulator(int3472, agpio);
 		if (ret)
@@ -341,21 +330,6 @@ static int skl_int3472_parse_crs(struct int3472_discrete_device *int3472)
 
 	acpi_dev_free_resource_list(&resource_list);
 
-	/*
-	 * If we find no clock enable GPIO pin then the privacy LED won't work.
-	 * We've never seen that situation, but it's possible. Warn the user so
-	 * it's clear what's happened.
-	 */
-	if (int3472->clock.ena_gpio) {
-		ret = skl_int3472_register_clock(int3472);
-		if (ret)
-			return ret;
-	} else {
-		if (int3472->clock.led_gpio)
-			dev_warn(int3472->dev,
-				 "No clk GPIO. The privacy LED won't work\n");
-	}
-
 	int3472->gpios.dev_id = int3472->sensor_name;
 	gpiod_add_lookup_table(&int3472->gpios);
 
@@ -372,8 +346,8 @@ static int skl_int3472_discrete_remove(struct platform_device *pdev)
 		skl_int3472_unregister_clock(int3472);
 
 	gpiod_put(int3472->clock.ena_gpio);
-	gpiod_put(int3472->clock.led_gpio);
 
+	skl_int3472_unregister_pled(int3472);
 	skl_int3472_unregister_regulator(int3472);
 
 	return 0;