diff options
Diffstat (limited to 'drivers/usb/typec/mux/gpio-switch.c')
| -rw-r--r-- | drivers/usb/typec/mux/gpio-switch.c | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/drivers/usb/typec/mux/gpio-switch.c b/drivers/usb/typec/mux/gpio-switch.c new file mode 100644 index 000000000000..6029e224a848 --- /dev/null +++ b/drivers/usb/typec/mux/gpio-switch.c @@ -0,0 +1,118 @@ +// 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>"); |