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mfd: arizona: Add support for ACPI enumeration of WM5102 connected over SPI 

The Intel Bay Trail (x86/ACPI) based Lenovo Yoga Tablet 2 series use
a WM5102 codec connected over SPI.

Add support for ACPI enumeration to arizona-spi so that arizona-spi can
bind to the codec on these tablets.

This is loosely based on an earlier attempt (for Android-x86) at this by
Christian Hartmann, combined with insights in things like the speaker GPIO
from the android-x86 android port for the Lenovo Yoga Tablet 2 1051F/L [1].

[1] https://github.com/Kitsune2222/Android_Yoga_Tablet_2-1051F_Kernel

Cc: Christian Hartmann <cornogle@googlemail.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Hans de Goede 2021-01-20 22:49:55 +01:00 committed by Lee Jones
parent 039da225d6
commit e933836744
1 changed files with 127 additions and 0 deletions
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127
drivers/mfd/arizona-spi.c
View File

@ -7,7 +7,10 @@
* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
*/
#include <linux/acpi.h>
#include <linux/err.h>
#include <linux/gpio/consumer.h>
#include <linux/gpio/machine.h>
#include <linux/module.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
@ -15,11 +18,128 @@
#include <linux/slab.h>
#include <linux/spi/spi.h>
#include <linux/of.h>
#include <uapi/linux/input-event-codes.h>
#include <linux/mfd/arizona/core.h>
#include "arizona.h"
#ifdef CONFIG_ACPI
const struct acpi_gpio_params reset_gpios = { 1, 0, false };
const struct acpi_gpio_params ldoena_gpios = { 2, 0, false };
static const struct acpi_gpio_mapping arizona_acpi_gpios[] = {
{ "reset-gpios", &reset_gpios, 1, },
{ "wlf,ldoena-gpios", &ldoena_gpios, 1 },
{ }
};
/*
* The ACPI resources for the device only describe external GPIO-s. They do
* not provide mappings for the GPIO-s coming from the Arizona codec itself.
*/
static const struct gpiod_lookup arizona_soc_gpios[] = {
{ "arizona", 2, "wlf,spkvdd-ena", 0, GPIO_ACTIVE_HIGH },
{ "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)
{
struct gpiod_lookup_table *lookup;
acpi_status status;
int ret;
/* Add mappings for the 2 ACPI declared GPIOs used for reset and ldo-ena */
devm_acpi_dev_add_driver_gpios(arizona->dev, arizona_acpi_gpios);
/* Add lookups for the SoCs own GPIOs used for micdet-polarity and spkVDD-enable */
lookup = devm_kzalloc(arizona->dev,
struct_size(lookup, table, ARRAY_SIZE(arizona_soc_gpios) + 1),
GFP_KERNEL);
if (!lookup)
return -ENOMEM;
lookup->dev_id = dev_name(arizona->dev);
memcpy(lookup->table, arizona_soc_gpios, sizeof(arizona_soc_gpios));
gpiod_add_lookup_table(lookup);
ret = devm_add_action_or_reset(arizona->dev, arizona_spi_acpi_remove_lookup, lookup);
if (ret)
return ret;
/* Enable 32KHz clock from SoC to codec for jack-detect */
status = acpi_evaluate_object(ACPI_HANDLE(arizona->dev), "CLKE", NULL, NULL);
if (ACPI_FAILURE(status))
dev_warn(arizona->dev, "Failed to enable 32KHz clk ACPI error %d\n", status);
/*
* 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
* the IRQ status flags and acknowledging them. When the IRQ line stays
* low like this the IRQ will never trigger again when its type is set
* to IRQF_TRIGGER_FALLING. Correct the IRQ trigger-type to fix this.
*
* Note theoretically it is possible that some boards are not capable
* of handling active low level interrupts. In that case setting the
* flag to IRQF_TRIGGER_FALLING would not be a bug (and we would need
* to work around this) but so far all known usages of IRQF_TRIGGER_FALLING
* are a bug in the board's DSDT.
*/
arizona->pdata.irq_flags = IRQF_TRIGGER_LOW;
/* Wait 200 ms after jack insertion */
arizona->pdata.micd_detect_debounce = 200;
/* Use standard AOSP values for headset-button mappings */
arizona->pdata.micd_ranges = arizona_micd_aosp_ranges;
arizona->pdata.num_micd_ranges = ARRAY_SIZE(arizona_micd_aosp_ranges);
return 0;
}
static const struct acpi_device_id arizona_acpi_match[] = {
{
.id = "WM510204",
.driver_data = WM5102,
},
{
.id = "WM510205",
.driver_data = WM5102,
},
{ }
};
MODULE_DEVICE_TABLE(acpi, arizona_acpi_match);
#else
static int arizona_spi_acpi_probe(struct arizona *arizona)
{
return -ENODEV;
}
#endif
static int arizona_spi_probe(struct spi_device *spi)
{
const struct spi_device_id *id = spi_get_device_id(spi);
@ -77,6 +197,12 @@ static int arizona_spi_probe(struct spi_device *spi)
arizona->dev = &spi->dev;
arizona->irq = spi->irq;
if (has_acpi_companion(&spi->dev)) {
ret = arizona_spi_acpi_probe(arizona);
if (ret)
return ret;
}
return arizona_dev_init(arizona);
}
@ -104,6 +230,7 @@ static struct spi_driver arizona_spi_driver = {
.name = "arizona",
.pm = &arizona_pm_ops,
.of_match_table = of_match_ptr(arizona_of_match),
.acpi_match_table = ACPI_PTR(arizona_acpi_match),
},
.probe = arizona_spi_probe,
.remove = arizona_spi_remove,