linux-kernel - [PATCH v2 1/2] mfd: arizona-spi: Split Windows ACPI init code into its own function

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Date:   Mon,  7 Mar 2022 18:38:43 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     Hans de Goede <hdegoede@...hat.com>, patches@...nsource.cirrus.com,
        linux-kernel@...r.kernel.org,
        Charles Keepax <ckeepax@...nsource.cirrus.com>
Subject: [PATCH v2 1/2] mfd: arizona-spi: Split Windows ACPI init code into its own function

x86/ACPI boards with an arizona WM5102 codec ship with either Windows or
Android as factory installed OS.

The ACPI fwnode describing the codec differs depending on the factory OS,
and the current arizona_spi_acpi_probe() function is tailored for use
with the Windows board ACPI tables.

Split out the Windows board ACPI tables specific bits into a new
arizona_spi_acpi_windows_probe() function in preparation for also
adding support for the Android board ACPI tables.

Acked-by: Charles Keepax <ckeepax@...nsource.cirrus.com>
Signed-off-by: Hans de Goede <hdegoede@...hat.com>
---
 drivers/mfd/arizona-spi.c | 52 ++++++++++++++++++++++++---------------
 1 file changed, 32 insertions(+), 20 deletions(-)

diff --git a/drivers/mfd/arizona-spi.c b/drivers/mfd/arizona-spi.c
index 9fe06dda3782..238355542ab1 100644
--- a/drivers/mfd/arizona-spi.c
+++ b/drivers/mfd/arizona-spi.c
@@ -43,31 +43,13 @@ static const struct gpiod_lookup arizona_soc_gpios[] = {
 	{ "arizona", 4, "wlf,micd-pol", 0, GPIO_ACTIVE_LOW },
 };
 
-/*
- * The AOSP 3.5 mm Headset: Accessory Specification gives the following values:
- * Function A Play/Pause:           0 ohm
- * Function D Voice assistant:    135 ohm
- * Function B Volume Up           240 ohm
- * Function C Volume Down         470 ohm
- * Minimum Mic DC resistance     1000 ohm
- * Minimum Ear speaker impedance   16 ohm
- * Note the first max value below must be less then the min. speaker impedance,
- * to allow CTIA/OMTP detection to work. The other max values are the closest
- * value from extcon-arizona.c:arizona_micd_levels halfway 2 button resistances.
- */
-static const struct arizona_micd_range arizona_micd_aosp_ranges[] = {
-	{ .max =  11, .key = KEY_PLAYPAUSE },
-	{ .max = 186, .key = KEY_VOICECOMMAND },
-	{ .max = 348, .key = KEY_VOLUMEUP },
-	{ .max = 752, .key = KEY_VOLUMEDOWN },
-};
-
 static void arizona_spi_acpi_remove_lookup(void *lookup)
 {
 	gpiod_remove_lookup_table(lookup);
 }
 
-static int arizona_spi_acpi_probe(struct arizona *arizona)
+/* For ACPI tables from boards which ship with Windows as factory OS */
+static int arizona_spi_acpi_windows_probe(struct arizona *arizona)
 {
 	struct gpiod_lookup_table *lookup;
 	acpi_status status;
@@ -96,6 +78,36 @@ static int arizona_spi_acpi_probe(struct arizona *arizona)
 	if (ACPI_FAILURE(status))
 		dev_warn(arizona->dev, "Failed to enable 32KHz clk ACPI error %d\n", status);
 
+	return 0;
+}
+
+/*
+ * The AOSP 3.5 mm Headset: Accessory Specification gives the following values:
+ * Function A Play/Pause:           0 ohm
+ * Function D Voice assistant:    135 ohm
+ * Function B Volume Up           240 ohm
+ * Function C Volume Down         470 ohm
+ * Minimum Mic DC resistance     1000 ohm
+ * Minimum Ear speaker impedance   16 ohm
+ * Note the first max value below must be less then the min. speaker impedance,
+ * to allow CTIA/OMTP detection to work. The other max values are the closest
+ * value from extcon-arizona.c:arizona_micd_levels halfway 2 button resistances.
+ */
+static const struct arizona_micd_range arizona_micd_aosp_ranges[] = {
+	{ .max =  11, .key = KEY_PLAYPAUSE },
+	{ .max = 186, .key = KEY_VOICECOMMAND },
+	{ .max = 348, .key = KEY_VOLUMEUP },
+	{ .max = 752, .key = KEY_VOLUMEDOWN },
+};
+
+static int arizona_spi_acpi_probe(struct arizona *arizona)
+{
+	int ret;
+
+	ret = arizona_spi_acpi_windows_probe(arizona);
+	if (ret)
+		return ret;
+
 	/*
 	 * Some DSDTs wrongly declare the IRQ trigger-type as IRQF_TRIGGER_FALLING
 	 * The IRQ line will stay low when a new IRQ event happens between reading
-- 
2.35.1