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// SPDX-License-Identifier: GPL-2.0
/**
* gpio-switch.c - typec switch via a simple GPIO control.
*
* Copyright 2019 NXP
* Author: Jun Li <jun.li@nxp.com>
*
*/
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/of_gpio.h>
#include <linux/usb/typec_mux.h>
struct gpio_typec_switch {
struct typec_switch *sw;
struct mutex lock;
struct gpio_desc *ss_sel;
struct gpio_desc *ss_reset;
};
static int switch_gpio_set(struct typec_switch *sw,
enum typec_orientation orientation)
{
struct gpio_typec_switch *gpio_sw = typec_switch_get_drvdata(sw);
mutex_lock(&gpio_sw->lock);
switch (orientation) {
case TYPEC_ORIENTATION_NORMAL:
gpiod_set_value_cansleep(gpio_sw->ss_sel, 1);
break;
case TYPEC_ORIENTATION_REVERSE:
gpiod_set_value_cansleep(gpio_sw->ss_sel, 0);
break;
case TYPEC_ORIENTATION_NONE:
break;
}
mutex_unlock(&gpio_sw->lock);
return 0;
}
static int typec_switch_gpio_probe(struct platform_device *pdev)
{
struct gpio_typec_switch *gpio_sw;
struct device *dev = &pdev->dev;
struct typec_switch_desc sw_desc;
gpio_sw = devm_kzalloc(dev, sizeof(*gpio_sw), GFP_KERNEL);
if (!gpio_sw)
return -ENOMEM;
platform_set_drvdata(pdev, gpio_sw);
sw_desc.drvdata = gpio_sw;
sw_desc.fwnode = dev->fwnode;
sw_desc.set = switch_gpio_set;
sw_desc.name = NULL;
mutex_init(&gpio_sw->lock);
/* Get the super speed mux reset GPIO, it's optional */
gpio_sw->ss_reset = devm_gpiod_get_optional(dev, "reset",
GPIOD_OUT_HIGH);
if (IS_ERR(gpio_sw->ss_reset))
return PTR_ERR(gpio_sw->ss_reset);
if (gpio_sw->ss_reset)
usleep_range(700, 1000);
/* Get the super speed active channel selection GPIO */
gpio_sw->ss_sel = devm_gpiod_get(dev, "switch", GPIOD_OUT_LOW);
if (IS_ERR(gpio_sw->ss_sel))
return PTR_ERR(gpio_sw->ss_sel);
gpio_sw->sw = typec_switch_register(dev, &sw_desc);
if (IS_ERR(gpio_sw->sw)) {
dev_err(dev, "Error registering typec switch: %ld\n", PTR_ERR(gpio_sw->sw));
return PTR_ERR(gpio_sw->sw);
}
return 0;
}
static int typec_switch_gpio_remove(struct platform_device *pdev)
{
struct gpio_typec_switch *gpio_sw = platform_get_drvdata(pdev);
typec_switch_unregister(gpio_sw->sw);
return 0;
}
static const struct of_device_id of_typec_switch_gpio_match[] = {
{ .compatible = "nxp,ptn36043" },
{ .compatible = "nxp,cbtl04gp" },
{ /* Sentinel */ }
};
MODULE_DEVICE_TABLE(of, of_typec_switch_gpio_match);
static struct platform_driver typec_switch_gpio_driver = {
.probe = typec_switch_gpio_probe,
.remove = typec_switch_gpio_remove,
.driver = {
.name = "typec-switch-gpio",
.of_match_table = of_typec_switch_gpio_match,
},
};
module_platform_driver(typec_switch_gpio_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("TypeC Super Speed Switch GPIO driver");
MODULE_AUTHOR("Jun Li <jun.li@nxp.com>");
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