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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2022 Linaro Ltd.
*/
#include <linux/bits.h>
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/gpio/consumer.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/usb/typec_dp.h>
#include <linux/usb/typec_mux.h>
struct gpio_sbu_mux {
struct gpio_desc *enable_gpio;
struct gpio_desc *select_gpio;
struct typec_switch_dev *sw;
struct typec_mux_dev *mux;
struct mutex lock; /* protect enabled and swapped */
bool enabled;
bool swapped;
};
static int gpio_sbu_switch_set(struct typec_switch_dev *sw,
enum typec_orientation orientation)
{
struct gpio_sbu_mux *sbu_mux = typec_switch_get_drvdata(sw);
bool enabled;
bool swapped;
mutex_lock(&sbu_mux->lock);
enabled = sbu_mux->enabled;
swapped = sbu_mux->swapped;
switch (orientation) {
case TYPEC_ORIENTATION_NONE:
enabled = false;
break;
case TYPEC_ORIENTATION_NORMAL:
swapped = false;
break;
case TYPEC_ORIENTATION_REVERSE:
swapped = true;
break;
}
if (enabled != sbu_mux->enabled)
gpiod_set_value(sbu_mux->enable_gpio, enabled);
if (swapped != sbu_mux->swapped)
gpiod_set_value(sbu_mux->select_gpio, swapped);
sbu_mux->enabled = enabled;
sbu_mux->swapped = swapped;
mutex_unlock(&sbu_mux->lock);
return 0;
}
static int gpio_sbu_mux_set(struct typec_mux_dev *mux,
struct typec_mux_state *state)
{
struct gpio_sbu_mux *sbu_mux = typec_mux_get_drvdata(mux);
mutex_lock(&sbu_mux->lock);
switch (state->mode) {
case TYPEC_STATE_SAFE:
case TYPEC_STATE_USB:
sbu_mux->enabled = false;
break;
case TYPEC_DP_STATE_C:
case TYPEC_DP_STATE_D:
case TYPEC_DP_STATE_E:
sbu_mux->enabled = true;
break;
default:
break;
}
gpiod_set_value(sbu_mux->enable_gpio, sbu_mux->enabled);
mutex_unlock(&sbu_mux->lock);
return 0;
}
static int gpio_sbu_mux_probe(struct platform_device *pdev)
{
struct typec_switch_desc sw_desc = { };
struct typec_mux_desc mux_desc = { };
struct device *dev = &pdev->dev;
struct gpio_sbu_mux *sbu_mux;
sbu_mux = devm_kzalloc(dev, sizeof(*sbu_mux), GFP_KERNEL);
if (!sbu_mux)
return -ENOMEM;
mutex_init(&sbu_mux->lock);
sbu_mux->enable_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);
if (IS_ERR(sbu_mux->enable_gpio))
return dev_err_probe(dev, PTR_ERR(sbu_mux->enable_gpio),
"unable to acquire enable gpio\n");
sbu_mux->select_gpio = devm_gpiod_get(dev, "select", GPIOD_OUT_LOW);
if (IS_ERR(sbu_mux->select_gpio))
return dev_err_probe(dev, PTR_ERR(sbu_mux->select_gpio),
"unable to acquire select gpio\n");
sw_desc.drvdata = sbu_mux;
sw_desc.fwnode = dev_fwnode(dev);
sw_desc.set = gpio_sbu_switch_set;
sbu_mux->sw = typec_switch_register(dev, &sw_desc);
if (IS_ERR(sbu_mux->sw))
return dev_err_probe(dev, PTR_ERR(sbu_mux->sw),
"failed to register typec switch\n");
mux_desc.drvdata = sbu_mux;
mux_desc.fwnode = dev_fwnode(dev);
mux_desc.set = gpio_sbu_mux_set;
sbu_mux->mux = typec_mux_register(dev, &mux_desc);
if (IS_ERR(sbu_mux->mux)) {
typec_switch_unregister(sbu_mux->sw);
return dev_err_probe(dev, PTR_ERR(sbu_mux->mux),
"failed to register typec mux\n");
}
platform_set_drvdata(pdev, sbu_mux);
return 0;
}
static int gpio_sbu_mux_remove(struct platform_device *pdev)
{
struct gpio_sbu_mux *sbu_mux = platform_get_drvdata(pdev);
gpiod_set_value(sbu_mux->enable_gpio, 0);
typec_mux_unregister(sbu_mux->mux);
typec_switch_unregister(sbu_mux->sw);
return 0;
}
static const struct of_device_id gpio_sbu_mux_match[] = {
{ .compatible = "gpio-sbu-mux", },
{}
};
MODULE_DEVICE_TABLE(of, gpio_sbu_mux_match);
static struct platform_driver gpio_sbu_mux_driver = {
.probe = gpio_sbu_mux_probe,
.remove = gpio_sbu_mux_remove,
.driver = {
.name = "gpio_sbu_mux",
.of_match_table = gpio_sbu_mux_match,
},
};
module_platform_driver(gpio_sbu_mux_driver);
MODULE_DESCRIPTION("GPIO based SBU mux driver");
MODULE_LICENSE("GPL");
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