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Commit 38cc775a authored by Jack Pham's avatar Jack Pham
Browse files

extcon: usb-gpio: Add support for optional VBUS output enable GPIO 



On many platforms 5V VBUS output can be provided by external
circuitry and turned on via GPIO. For convenience, on micro-AB
ports this can be done in conjunction when ID pin becomes low
meaning USB_HOST mode is to be entered. Add support for an
optional "vbus-out" GPIO to this driver.

Change-Id: Id58e5dca5375b8140c75ce7cd6769dd8a31a2af7
Signed-off-by: default avatarJack Pham <jackp@codeaurora.org>
parent 43ee8667

drivers/extcon/extcon-usb-gpio.c

+12 −1
Original line number Diff line number Diff line
@@ -28,6 +28,7 @@ struct usb_extcon_info { 


	struct gpio_desc *id_gpiod;

	struct gpio_desc *vbus_gpiod;

	struct gpio_desc *vbus_out_gpiod;

	int id_irq;

	int vbus_irq;
@@ -72,12 +73,17 @@ static void usb_extcon_detect_cable(struct work_struct *work) 
		gpiod_get_value_cansleep(info->vbus_gpiod) : id;



	/* at first we clean states which are no longer active */

	if (id)

	if (id) {

		if (info->vbus_out_gpiod)

			gpiod_set_value_cansleep(info->vbus_out_gpiod, 0);

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

	}

	if (!vbus)

		extcon_set_state_sync(info->edev, EXTCON_USB, false);



	if (!id) {

		if (info->vbus_out_gpiod)

			gpiod_set_value_cansleep(info->vbus_out_gpiod, 1);

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

	} else {

		if (vbus)
@@ -113,6 +119,8 @@ 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->vbus_out_gpiod = devm_gpiod_get_optional(&pdev->dev, "vbus-out",

						   GPIOD_OUT_HIGH);



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

		dev_err(dev, "failed to get gpios\n");
@@ -125,6 +133,9 @@ 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->vbus_out_gpiod))

		return PTR_ERR(info->vbus_out_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");