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Commit 3905e7ec authored by Bo Zhang's avatar Bo Zhang
Browse files

drivers/extcon: Trigger gpio when device switch to usb host mode 



Everytime device switch to usb host mode, trigger gpio to reset ethernet
bridge (LAN78xx), thus ethernet usb driver can be probed

Change-Id: I753c80cdcbf0a426738ce2bdcb44330bb2cabe71
Signed-off-by: default avatarBo Zhang <bozhang@codeaurora.org>
parent 3fd5243b

drivers/extcon/extcon-usb-gpio.c

+33 −0
Original line number Diff line number Diff line
@@ -27,6 +27,7 @@ 
#include <linux/slab.h>

#include <linux/workqueue.h>

#include <linux/acpi.h>

#include <linux/delay.h>



#define USB_GPIO_DEBOUNCE_MS	20	/* ms */
@@ -36,6 +37,7 @@ struct usb_extcon_info { 


	struct gpio_desc *id_gpiod;

	struct gpio_desc *vbus_gpiod;

	struct gpio_desc *trig_gpiod;

	int id_irq;

	int vbus_irq;
@@ -87,6 +89,12 @@ static void usb_extcon_detect_cable(struct work_struct *work) 


	if (!id) {

		extcon_set_state_sync(info->edev, EXTCON_USB_HOST, true);

		if (info->trig_gpiod) {

			gpiod_set_value(info->trig_gpiod, 1);

			msleep(20);

			gpiod_set_value(info->trig_gpiod, 0);

			msleep(20);

		}

	} else {

		if (vbus)

			extcon_set_state_sync(info->edev, EXTCON_USB, true);
@@ -109,6 +117,7 @@ static int usb_extcon_probe(struct platform_device *pdev) 
	struct device_node *np = dev->of_node;

	struct usb_extcon_info *info;

	int ret;

	const char *name = NULL;



	if (!np && !ACPI_HANDLE(dev))

		return -EINVAL;
@@ -121,6 +130,8 @@ static int usb_extcon_probe(struct platform_device *pdev) 
	info->id_gpiod = devm_gpiod_get_optional(&pdev->dev, "id", GPIOD_IN);

	info->vbus_gpiod = devm_gpiod_get_optional(&pdev->dev, "vbus",

						   GPIOD_IN);

	info->trig_gpiod = devm_gpiod_get_optional(&pdev->dev, "trig",

						   GPIOD_OUT_LOW);



	if (!info->id_gpiod && !info->vbus_gpiod) {

		dev_err(dev, "failed to get gpios\n");
@@ -133,6 +144,9 @@ static int usb_extcon_probe(struct platform_device *pdev) 
	if (IS_ERR(info->vbus_gpiod))

		return PTR_ERR(info->vbus_gpiod);



	if (IS_ERR(info->trig_gpiod))

		return PTR_ERR(info->trig_gpiod);



	info->edev = devm_extcon_dev_allocate(dev, usb_extcon_cable);

	if (IS_ERR(info->edev)) {

		dev_err(dev, "failed to allocate extcon device\n");
@@ -145,6 +159,25 @@ static int usb_extcon_probe(struct platform_device *pdev) 
		return ret;

	}



	if (info->trig_gpiod) {

		ret = of_property_read_string_index(np, "gpio-names", 0, &name);

		if (ret) {

			dev_err(dev, "Could not get gpio name\n");

			return ret;

		}



		ret = gpiod_export(info->trig_gpiod, 0);

		if (ret) {

			dev_err(dev, "failed to export gpio\n");

			return ret;

		}



		ret = gpiod_export_link(dev, name, info->trig_gpiod);

		if (ret) {

		dev_err(dev, "failed to export gpio link\n");

		return ret;

		}

	}

	if (info->id_gpiod)

		ret = gpiod_set_debounce(info->id_gpiod,

					 USB_GPIO_DEBOUNCE_MS * 1000);