linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 * Intel INT3496 ACPI device extcon driver

 *

 * Copyright (c) 2016 Hans de Goede <hdegoede@redhat.com>

 *

 * Based on android x86 kernel code which is:

 *

 * Copyright (c) 2014, Intel Corporation.

 * Author: David Cohen <david.a.cohen@linux.intel.com>

 */

​

#include <linux/acpi.h>

#include <linux/extcon-provider.h>

#include <linux/gpio/consumer.h>

#include <linux/interrupt.h>

#include <linux/module.h>

#include <linux/platform_device.h>

​

#define INT3496_GPIO_USB_ID 0

#define INT3496_GPIO_VBUS_EN    1

#define INT3496_GPIO_USB_MUX    2

#define DEBOUNCE_TIME       msecs_to_jiffies(50)

​

struct int3496_data {

    struct device *dev;

    struct extcon_dev *edev;

    struct delayed_work work;

    struct gpio_desc *gpio_usb_id;

    struct gpio_desc *gpio_vbus_en;

    struct gpio_desc *gpio_usb_mux;

    int usb_id_irq;

};

​

static const unsigned int int3496_cable[] = {

    EXTCON_USB_HOST,

    EXTCON_NONE,

};

​

static const struct acpi_gpio_params id_gpios = { INT3496_GPIO_USB_ID, 0, false };

static const struct acpi_gpio_params vbus_gpios = { INT3496_GPIO_VBUS_EN, 0, false };

static const struct acpi_gpio_params mux_gpios = { INT3496_GPIO_USB_MUX, 0, false };

​

static const struct acpi_gpio_mapping acpi_int3496_default_gpios[] = {

    /*

     * Some platforms have a bug in ACPI GPIO description making IRQ

     * GPIO to be output only. Ask the GPIO core to ignore this limit.

     */

    { "id-gpios", &id_gpios, 1, ACPI_GPIO_QUIRK_NO_IO_RESTRICTION },

    { "vbus-gpios", &vbus_gpios, 1 },

    { "mux-gpios", &mux_gpios, 1 },

    { },

};

​

static void int3496_do_usb_id(struct work_struct *work)

{

    struct int3496_data *data =

        container_of(work, struct int3496_data, work.work);

    int id = gpiod_get_value_cansleep(data->gpio_usb_id);

​

    /* id == 1: PERIPHERAL, id == 0: HOST */

    dev_dbg(data->dev, "Connected %s cable\n", id ? "PERIPHERAL" : "HOST");

​