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

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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: Jack Pham <jackp@codeaurora.org>
This commit is contained in:
Jack Pham 2018-03-16 14:03:52 -07:00
parent 43ee86678a
commit 38cc775a5c
1 changed files with 12 additions and 1 deletions
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13
drivers/extcon/extcon-usb-gpio.c
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@ -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/* at first we clean states which are no longer active */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");