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