path: root/drivers/platform/x86/x86-android-tablets.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * DMI based code to deal with broken DSDTs on X86 tablets which ship with
 * Android as (part of) the factory image. The factory kernels shipped on these
 * devices typically have a bunch of things hardcoded, rather than specified
 * in their DSDT.
 *
 * Copyright (C) 2021 Hans de Goede <hdegoede@redhat.com>
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/acpi.h>
#include <linux/dmi.h>
#include <linux/efi.h>
#include <linux/gpio_keys.h>
#include <linux/gpio/consumer.h>
#include <linux/gpio/driver.h>
#include <linux/gpio/machine.h>
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/pinctrl/consumer.h>
#include <linux/pinctrl/machine.h>
#include <linux/platform_data/lp855x.h>
#include <linux/platform_device.h>
#include <linux/power/bq24190_charger.h>
#include <linux/reboot.h>
#include <linux/rmi.h>
#include <linux/serdev.h>
#include <linux/spi/spi.h>
#include <linux/string.h>
/* For gpio_get_desc() which is EXPORT_SYMBOL_GPL() */
#include "../../gpio/gpiolib.h"
#include "../../gpio/gpiolib-acpi.h"

/*
 * Helper code to get Linux IRQ numbers given a description of the IRQ source
 * (either IOAPIC index, or GPIO chip name + pin-number).
 */
enum x86_acpi_irq_type {
	X86_ACPI_IRQ_TYPE_NONE,
	X86_ACPI_IRQ_TYPE_APIC,
	X86_ACPI_IRQ_TYPE_GPIOINT,
	X86_ACPI_IRQ_TYPE_PMIC,
};

struct x86_acpi_irq_data {
	char *chip;   /* GPIO chip label (GPIOINT) or PMIC ACPI path (PMIC) */
	enum x86_acpi_irq_type type;
	enum irq_domain_bus_token domain;
	int index;
	int trigger;  /* ACPI_EDGE_SENSITIVE / ACPI_LEVEL_SENSITIVE */
	int polarity; /* ACPI_ACTIVE_HIGH / ACPI_ACTIVE_LOW / ACPI_ACTIVE_BOTH */
};

static int gpiochip_find_match_label(struct gpio_chip *gc, void *data)
{
	return gc->label && !strcmp(gc->label, data);
}

static int x86_android_tablet_get_gpiod(char *label, int pin, struct gpio_desc **desc)
{
	struct gpio_desc *gpiod;
	struct gpio_chip *chip;

	chip = gpiochip_find(label, gpiochip_find_match_label);
	if (!chip) {
		pr_err("error cannot find GPIO chip %s\n", label);
		return -ENODEV;
	}

	gpiod = gpiochip_get_desc(chip, pin);
	if (IS_ERR(gpiod)) {
		pr_err("error %ld getting GPIO %s %d\n", PTR_ERR(gpiod), label, pin);
		return PTR_ERR(gpiod);
	}

	*desc = gpiod;
	return 0;
}

static int x86_acpi_irq_helper_get(const struct x86_acpi_irq_data *data)
{
	struct irq_fwspec fwspec = { };
	struct irq_domain *domain;
	struct acpi_device *adev;
	struct gpio_desc *gpiod;
	unsigned int irq_type;
	acpi_handle handle;
	acpi_status status;
	int irq, ret;

	switch (data->type) {
	case X86_ACPI_IRQ_TYPE_APIC:
		/*
		 * The DSDT may already reference the GSI in a device skipped by
		 * acpi_quirk_skip_i2c_client_enumeration(). Unregister the GSI
		 * to avoid EBUSY errors in this case.
		 */
		acpi_unregister_gsi(data->index);
		irq = acpi_register_gsi(NULL, data->index, data->trigger, data->polarity);
		if (irq < 0)
			pr_err("error %d getting APIC IRQ %d\n", irq, data->index);

		return irq;
	case X86_ACPI_IRQ_TYPE_GPIOINT:
		/* Like acpi_dev_gpio_irq_get(), but without parsing ACPI resources */
		ret = x86_android_tablet_get_gpiod(data->chip, data->index, &gpiod);
		if (ret)
			return ret;

		irq = gpiod_to_irq(gpiod);
		if (irq < 0) {
			pr_err("error %d getting IRQ %s %d\n", irq, data->chip, data->index);
			return irq;
		}

		irq_type = acpi_dev_get_irq_type(data->trigger, data->polarity);
		if (irq_type != IRQ_TYPE_NONE && irq_type != irq_get_trigger_type(irq))
			irq_set_irq_type(irq, irq_type);

		return irq;
	case X86_ACPI_IRQ_TYPE_PMIC:
		status = acpi_get_handle(NULL, data->chip, &handle);
		if (ACPI_FAILURE(status)) {
			pr_err("error could not get %s handle\n", data->chip);
			return -ENODEV;
		}

		adev = acpi_fetch_acpi_dev(handle);
		if (!adev) {
			pr_err("error could not get %s adev\n", data->chip);
			return -ENODEV;
		}

		fwspec.fwnode = acpi_fwnode_handle(adev);
		domain = irq_find_matching_fwspec(&fwspec, data->domain);
		if (!domain) {
			pr_err("error could not find IRQ domain for %s\n", data->chip);
			return -ENODEV;
		}

		return irq_create_mapping(domain, data->index);
	default:
		return 0;
	}
}

struct x86_i2c_client_info {
	struct i2c_board_info board_info;
	char *adapter_path;
	struct x86_acpi_irq_data irq_data;
};

struct x86_serdev_info {
	const char *ctrl_hid;
	const char *ctrl_uid;
	const char *ctrl_devname;
	/*
	 * ATM the serdev core only supports of or ACPI matching; and sofar all
	 * Android x86 tablets DSDTs have usable serdev nodes, but sometimes
	 * under the wrong controller. So we just tie the existing serdev ACPI
	 * node to the right controller.
	 */
	const char *serdev_hid;
};

struct x86_dev_info {
	char *invalid_aei_gpiochip;
	const char * const *modules;
	const struct software_node *bat_swnode;
	struct gpiod_lookup_table * const *gpiod_lookup_tables;
	const struct x86_i2c_client_info *i2c_client_info;
	const struct platform_device_info *pdev_info;
	const struct x86_serdev_info *serdev_info;
	int i2c_client_count;
	int pdev_count;
	int serdev_count;
	int (*init)(void);
	void (*exit)(void);
};

/* Generic / shared charger / battery settings */
static const char * const tusb1211_chg_det_psy[] = { "tusb1211-charger-detect" };
static const char * const bq24190_psy[] = { "bq24190-charger" };
static const char * const bq25890_psy[] = { "bq25890-charger" };

static const struct property_entry fg_bq24190_supply_props[] = {
	PROPERTY_ENTRY_STRING_ARRAY("supplied-from", bq24190_psy),
	{ }
};

static const struct software_node fg_bq24190_supply_node = {
	.properties = fg_bq24190_supply_props,
};

static const struct property_entry fg_bq25890_supply_props[] = {
	PROPERTY_ENTRY_STRING_ARRAY("supplied-from", bq25890_psy),
	{ }
};

static const struct software_node fg_bq25890_supply_node = {
	.properties = fg_bq25890_supply_props,
};

/* LiPo HighVoltage (max 4.35V) settings used by most devs with a HV bat. */
static const struct property_entry generic_lipo_hv_4v35_battery_props[] = {
	PROPERTY_ENTRY_STRING("compatible", "simple-battery"),
	PROPERTY_ENTRY_STRING("device-chemistry", "lithium-ion"),
	PROPERTY_ENTRY_U32("precharge-current-microamp", 256000),
	PROPERTY_ENTRY_U32("charge-term-current-microamp", 128000),
	PROPERTY_ENTRY_U32("constant-charge-current-max-microamp", 1856000),
	PROPERTY_ENTRY_U32("constant-charge-voltage-max-microvolt", 4352000),
	PROPERTY_ENTRY_U32("factory-internal-resistance-micro-ohms", 150000),
	{ }
};

static const struct software_node generic_lipo_hv_4v35_battery_node = {
	.properties = generic_lipo_hv_4v35_battery_props,
};

/* For enabling the bq24190 5V boost based on id-pin */
static struct regulator_consumer_supply intel_int3496_consumer = {
	.supply = "vbus",
	.dev_name = "intel-int3496",
};

static const struct regulator_init_data bq24190_vbus_init_data = {
	.constraints = {
		.name = "bq24190_vbus",
		.valid_ops_mask = REGULATOR_CHANGE_STATUS,
	},
	.consumer_supplies = &intel_int3496_consumer,
	.num_consumer_supplies = 1,
};

static struct bq24190_platform_data bq24190_pdata = {
	.regulator_init_data = &bq24190_vbus_init_data,
};

static const char * const bq24190_modules[] __initconst = {
	"intel_crystal_cove_charger", /* For the bq24190 IRQ */
	"bq24190_charger",            /* For the Vbus regulator for intel-int3496 */
	NULL
};

/* Generic pdevs array and gpio-lookups for micro USB ID pin handling */
static const struct platform_device_info int3496_pdevs[] __initconst = {
	{
		/* For micro USB ID pin handling */
		.name = "intel-int3496",
		.id = PLATFORM_DEVID_NONE,
	},
};

static struct gpiod_lookup_table int3496_gpo2_pin22_gpios = {
	.dev_id = "intel-int3496",
	.table = {
		GPIO_LOOKUP("INT33FC:02", 22, "id", GPIO_ACTIVE_HIGH),
		{ }
	},
};

/* Asus ME176C and TF103C tablets shared data */
static struct gpio_keys_button asus_me176c_tf103c_lid = {
	.code =