193 lines
6.2 KiB
Diff
193 lines
6.2 KiB
Diff
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From 73c418d5f8f0edbdeae3a47a0c916961decf5fdc Mon Sep 17 00:00:00 2001
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From: Hans de Goede <hdegoede@redhat.com>
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Date: Sun, 6 Dec 2020 17:50:17 +0100
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Subject: [PATCH 03/14] mfd: arizona: Add support for ACPI enumeration of
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WM5102 connected over SPI
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The Intel Bay Trail (x86/ACPI) based Lenovo Yoga Tablet 2 series use
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a WM5102 codec connected over SPI.
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Add support for ACPI enumeration to arizona-spi so that arizona-spi can
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bind to the codec on these tablets.
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This is loosely based on an earlier attempt (for Android-x86) at this by
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Christian Hartmann, combined with insights in things like the speaker GPIO
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from the android-x86 android port for the Lenovo Yoga Tablet 2 1051F/L [1].
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[1] https://github.com/Kitsune2222/Android_Yoga_Tablet_2-1051F_Kernel
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Cc: Christian Hartmann <cornogle@googlemail.com>
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Signed-off-by: Hans de Goede <hdegoede@redhat.com>
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---
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drivers/mfd/arizona-spi.c | 120 ++++++++++++++++++++++++++++++++++++++
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1 file changed, 120 insertions(+)
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diff --git a/drivers/mfd/arizona-spi.c b/drivers/mfd/arizona-spi.c
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index 704f214d2614..bcdbd72fefb5 100644
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--- a/drivers/mfd/arizona-spi.c
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+++ b/drivers/mfd/arizona-spi.c
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@@ -7,7 +7,10 @@
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* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
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*/
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+#include <linux/acpi.h>
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#include <linux/err.h>
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+#include <linux/gpio/consumer.h>
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+#include <linux/gpio/machine.h>
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#include <linux/module.h>
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#include <linux/pm_runtime.h>
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#include <linux/regmap.h>
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@@ -15,11 +18,119 @@
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#include <linux/slab.h>
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#include <linux/spi/spi.h>
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#include <linux/of.h>
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+#include <uapi/linux/input-event-codes.h>
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#include <linux/mfd/arizona/core.h>
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#include "arizona.h"
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+#ifdef CONFIG_ACPI
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+const struct acpi_gpio_params reset_gpios = { 1, 0, false };
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+const struct acpi_gpio_params ldoena_gpios = { 2, 0, false };
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+
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+static const struct acpi_gpio_mapping arizona_acpi_gpios[] = {
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+ { "reset-gpios", &reset_gpios, 1, },
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+ { "wlf,ldoena-gpios", &ldoena_gpios, 1 },
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+ { }
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+};
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+
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+/*
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+ * The ACPI resources for the device only describe external GPIO-s. They do
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+ * not provide mappings for the GPIO-s coming from the Arizona codec itself.
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+ */
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+static const struct gpiod_lookup arizona_soc_gpios[] = {
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+ { "arizona", 2, "wlf,spkvdd-ena", 0, GPIO_ACTIVE_HIGH },
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+ { "arizona", 4, "wlf,micd-pol", 0, GPIO_ACTIVE_LOW },
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+};
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+
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+/*
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+ * The AOSP 3.5 mm Headset: Accessory Specification gives the following values:
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+ * Function A Play/Pause: 0 ohm
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+ * Function D Voice assistant: 135 ohm
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+ * Function B Volume Up 240 ohm
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+ * Function C Volume Down 470 ohm
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+ * Minimum Mic DC resistance 1000 ohm
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+ * Minimum Ear speaker impedance 16 ohm
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+ * Note the first max value below must be less then the min. speaker impedance,
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+ * to allow CTIA/OMTP detection to work. The other max values are the closest
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+ * value from extcon-arizona.c:arizona_micd_levels halfway 2 button resistances.
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+ */
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+static const struct arizona_micd_range arizona_micd_aosp_ranges[] = {
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+ { .max = 11, .key = KEY_PLAYPAUSE },
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+ { .max = 186, .key = KEY_VOICECOMMAND },
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+ { .max = 348, .key = KEY_VOLUMEUP },
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+ { .max = 752, .key = KEY_VOLUMEDOWN },
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+};
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+
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+static void arizona_spi_acpi_remove_lookup(void *lookup)
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+{
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+ gpiod_remove_lookup_table(lookup);
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+}
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+
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+static int arizona_spi_acpi_probe(struct arizona *arizona)
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+{
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+ struct gpiod_lookup_table *lookup;
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+ int i, ret;
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+
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+ /* Add mappings for the 2 ACPI declared GPIOs used for reset and ldo-ena */
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+ devm_acpi_dev_add_driver_gpios(arizona->dev, arizona_acpi_gpios);
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+
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+ /* Add lookups for the SoCs own GPIOs used for micdet-polarity and spkVDD-enable */
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+ lookup = devm_kzalloc(arizona->dev,
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+ struct_size(lookup, table, ARRAY_SIZE(arizona_soc_gpios) + 1),
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+ GFP_KERNEL);
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+ if (!lookup)
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+ return -ENOMEM;
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+
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+ lookup->dev_id = dev_name(arizona->dev);
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+ for (i = 0; i < ARRAY_SIZE(arizona_soc_gpios); i++)
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+ lookup->table[i] = arizona_soc_gpios[i];
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+
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+ gpiod_add_lookup_table(lookup);
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+ ret = devm_add_action_or_reset(arizona->dev, arizona_spi_acpi_remove_lookup, lookup);
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+ if (ret)
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+ return ret;
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+
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+ /* Enable 32KHz clock from SoC to codec for jack-detect */
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+ acpi_evaluate_object(ACPI_HANDLE(arizona->dev), "CLKE", NULL, NULL);
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+
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+ /*
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+ * Some DSDTs wrongly declare the IRQ trigger-type as IRQF_TRIGGER_FALLING
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+ * The IRQ line will stay low when a new IRQ event happens between reading
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+ * the IRQ status flags and acknowledging them. When the IRQ line stays
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+ * low like this the IRQ will never trigger again when its type is set
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+ * to IRQF_TRIGGER_FALLING. Correct the IRQ trigger-type to fix this.
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+ */
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+ arizona->pdata.irq_flags = IRQF_TRIGGER_LOW;
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+
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+ /* Wait 200 ms after jack insertion */
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+ arizona->pdata.micd_detect_debounce = 200;
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+
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+ /* Use standard AOSP values for headset-button mappings */
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+ arizona->pdata.micd_ranges = arizona_micd_aosp_ranges;
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+ arizona->pdata.num_micd_ranges = ARRAY_SIZE(arizona_micd_aosp_ranges);
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+
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+ return 0;
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+}
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+
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+static const struct acpi_device_id arizona_acpi_match[] = {
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+ {
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+ .id = "WM510204",
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+ .driver_data = WM5102,
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+ },
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+ {
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+ .id = "WM510205",
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+ .driver_data = WM5102,
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+ },
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+ { },
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+};
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+MODULE_DEVICE_TABLE(acpi, arizona_acpi_match);
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+#else
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+static void arizona_spi_acpi_probe(struct arizona *arizona)
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+{
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+}
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+#endif
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+
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static int arizona_spi_probe(struct spi_device *spi)
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{
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const struct spi_device_id *id = spi_get_device_id(spi);
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@@ -30,6 +141,8 @@ static int arizona_spi_probe(struct spi_device *spi)
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if (spi->dev.of_node)
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type = arizona_of_get_type(&spi->dev);
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+ else if (ACPI_COMPANION(&spi->dev))
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+ type = (unsigned long)acpi_device_get_match_data(&spi->dev);
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else
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type = id->driver_data;
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@@ -75,6 +188,12 @@ static int arizona_spi_probe(struct spi_device *spi)
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arizona->dev = &spi->dev;
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arizona->irq = spi->irq;
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+ if (ACPI_COMPANION(&spi->dev)) {
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+ ret = arizona_spi_acpi_probe(arizona);
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+ if (ret)
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+ return ret;
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+ }
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+
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return arizona_dev_init(arizona);
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}
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@@ -102,6 +221,7 @@ static struct spi_driver arizona_spi_driver = {
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.name = "arizona",
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.pm = &arizona_pm_ops,
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.of_match_table = of_match_ptr(arizona_of_match),
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+ .acpi_match_table = ACPI_PTR(arizona_acpi_match),
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},
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.probe = arizona_spi_probe,
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.remove = arizona_spi_remove,
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--
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2.28.0
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