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Subject[PATCH v2 2/2] mfd: arizona-spi: Add Android board ACPI table handling
Date
x86/ACPI boards with an arizona WM5102 codec ship with either Windows or
Android as factory installed OS.

The ACPI fwnode for the codec on Android boards misses 2 things compared
to the Windows boards (this is hardcoded in the Android board kernels):

1. There is no CLKE ACPI method to enabe the 32 KHz clock the codec needs
for jack-detection.

2. The GPIOs used by the codec are not listed in the fwnode for the codec.

The ACPI tables on x86/ACPI boards shipped with Android being incomplete
happens a lot. The special drivers/platform/x86/x86-android-tablets.c
module contains DMI based per model handling to compensate for this.

This module will enable the 32KHz clock through the pinctrl framework
to fix 1. and it will also register a gpio-lookup table for all GPIOs
needed by the codec + machine driver, including the GPIOs coming from
the codec itself.

Add an arizona_spi_acpi_android_probe() function which waits for the
x86-android-tablets to have set things up before continue with probing
the arizona WM5102 codec.

Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
Changes in v2:
- Wrap long dev_info_once() line
---
drivers/mfd/arizona-spi.c | 35 ++++++++++++++++++++++++++++++++++-
1 file changed, 34 insertions(+), 1 deletion(-)

diff --git a/drivers/mfd/arizona-spi.c b/drivers/mfd/arizona-spi.c
index 238355542ab1..ada5664aadd1 100644
--- a/drivers/mfd/arizona-spi.c
+++ b/drivers/mfd/arizona-spi.c
@@ -81,6 +81,30 @@ static int arizona_spi_acpi_windows_probe(struct arizona *arizona)
return 0;
}

+/* For ACPI tables from boards which ship with Android as factory OS */
+static int arizona_spi_acpi_android_probe(struct arizona *arizona)
+{
+ int ret;
+
+ /*
+ * Get the reset GPIO, treating -ENOENT as -EPROBE_DEFER to wait for
+ * the x86-android-tablets module to register the board specific GPIO
+ * lookup table.
+ */
+ arizona->pdata.reset = devm_gpiod_get(arizona->dev, "reset", GPIOD_OUT_LOW);
+ if (IS_ERR(arizona->pdata.reset)) {
+ ret = PTR_ERR(arizona->pdata.reset);
+ if (ret == -ENOENT) {
+ dev_info_once(arizona->dev,
+ "Deferring probe till GPIO lookup is registered\n");
+ ret = -EPROBE_DEFER;
+ }
+ return dev_err_probe(arizona->dev, ret, "getting reset GPIO\n");
+ }
+
+ return 0;
+}
+
/*
* The AOSP 3.5 mm Headset: Accessory Specification gives the following values:
* Function A Play/Pause: 0 ohm
@@ -102,9 +126,14 @@ static const struct arizona_micd_range arizona_micd_aosp_ranges[] = {

static int arizona_spi_acpi_probe(struct arizona *arizona)
{
+ struct acpi_device *adev = ACPI_COMPANION(arizona->dev);
int ret;

- ret = arizona_spi_acpi_windows_probe(arizona);
+ if (acpi_dev_hid_uid_match(adev, "10WM5102", NULL))
+ ret = arizona_spi_acpi_android_probe(arizona);
+ else
+ ret = arizona_spi_acpi_windows_probe(arizona);
+
if (ret)
return ret;

@@ -142,6 +171,10 @@ static const struct acpi_device_id arizona_acpi_match[] = {
.id = "WM510205",
.driver_data = WM5102,
},
+ {
+ .id = "10WM5102",
+ .driver_data = WM5102,
+ },
{ }
};
MODULE_DEVICE_TABLE(acpi, arizona_acpi_match);
--
2.35.1
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