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// SPDX-License-Identifier: GPL-2.0
/*
* Driver for GPIO controlled aux switch
*
* Copyright (C) 2020 The Linux Foundation
*/
#include <linux/gpio.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/usb/typec_dp.h>
#include <linux/usb/typec_mux.h>
#include <linux/usb/pd.h>
struct gpio_aux_switch {
struct typec_mux *typec_mux;
struct gpio_desc *gpio_en, *gpio_cc;
};
static int gpio_typec_mux_set(struct typec_mux *mux, struct typec_mux_state *state)
{
struct gpio_aux_switch *gas = typec_mux_get_drvdata(mux);
bool enable = false, reverse = false;
if (!state->alt)
return 0;
if (typec_altmode_get_orientation(state->alt) == TYPEC_ORIENTATION_REVERSE)
reverse = true;
if (state->alt->svid == USB_TYPEC_DP_SID && state->alt->active)
enable = true;
gpiod_set_value(gas->gpio_en, !enable);
gpiod_set_value(gas->gpio_cc, reverse);
return 0;
}
static int gpio_aux_switch_probe(struct platform_device *pdev)
{
struct typec_mux_desc mux_desc = { };
struct device *dev = &pdev->dev;
struct gpio_aux_switch *gas;
gas = devm_kzalloc(dev, sizeof(*gas), GFP_KERNEL);
if (!gas)
return -ENOMEM;
gas->gpio_en = devm_gpiod_get(dev, "enable", GPIOD_OUT_HIGH);
gas->gpio_cc = devm_gpiod_get(dev, "cc", GPIOD_OUT_LOW);
mux_desc.fwnode = dev->fwnode;
mux_desc.drvdata = gas;
mux_desc.set = gpio_typec_mux_set;
gas->typec_mux = typec_mux_register(dev, &mux_desc);
if (IS_ERR(gas->typec_mux))
return PTR_ERR(gas->typec_mux);
platform_set_drvdata(pdev, gas);
return 0;
}
static int gpio_aux_switch_remove(struct platform_device *pdev)
{
struct gpio_aux_switch *gas = platform_get_drvdata(pdev);
typec_mux_unregister(gas->typec_mux);
return 0;
}
static const struct of_device_id gpio_aux_switch_dt_match[] = {
{ .compatible = "gpio-aux-switch" },
{ }
};
static struct platform_driver gpio_aux_switch_driver = {
.driver = {
.name = "gpio-aux-switch",
.of_match_table = gpio_aux_switch_dt_match,
},
.probe = gpio_aux_switch_probe,
.remove = gpio_aux_switch_remove,
};
module_platform_driver(gpio_aux_switch_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("GPIO AUX Switch driver");
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