extcon: palmas: Handle ID interrupt properly using USB_ID_INT_SRC

Always cross check with the ID state and the source of interrupt.
Also add a case in which ID Source is ID_GND but LATCH state is set
wrongly. This uses the previous Link stat to determine the new state.

Signed-off-by: George Cherian <george.cherian@ti.com>
Acked-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>

diff --git a/drivers/extcon/extcon-palmas.c b/drivers/extcon/extcon-palmas.c
index 6e83e9a..2aea4bc 100644 (file)
--- a/drivers/extcon/extcon-palmas.c
+++ b/drivers/extcon/extcon-palmas.c
@@ -78,20 +78,24 @@ static irqreturn_t palmas_vbus_irq_handler(int irq, void *_palmas_usb)
 
 static irqreturn_t palmas_id_irq_handler(int irq, void *_palmas_usb)
 {
-       unsigned int set;
+       unsigned int set, id_src;
        struct palmas_usb *palmas_usb = _palmas_usb;
 
        palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
                PALMAS_USB_ID_INT_LATCH_SET, &set);
+       palmas_read(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
+               PALMAS_USB_ID_INT_SRC, &id_src);
 
-       if (set & PALMAS_USB_ID_INT_SRC_ID_GND) {
+       if ((set & PALMAS_USB_ID_INT_SRC_ID_GND) &&
+                               (id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) {
                palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
                        PALMAS_USB_ID_INT_LATCH_CLR,
                        PALMAS_USB_ID_INT_EN_HI_CLR_ID_GND);
                palmas_usb->linkstat = PALMAS_USB_STATE_ID;
                extcon_set_cable_state(&palmas_usb->edev, "USB-HOST", true);
                dev_info(palmas_usb->dev, "USB-HOST cable is attached\n");
-       } else if (set & PALMAS_USB_ID_INT_SRC_ID_FLOAT) {
+       } else if ((set & PALMAS_USB_ID_INT_SRC_ID_FLOAT) &&
+                               (id_src & PALMAS_USB_ID_INT_SRC_ID_FLOAT)) {
                palmas_write(palmas_usb->palmas, PALMAS_USB_OTG_BASE,
                        PALMAS_USB_ID_INT_LATCH_CLR,
                        PALMAS_USB_ID_INT_EN_HI_CLR_ID_FLOAT);
@@ -103,6 +107,11 @@ static irqreturn_t palmas_id_irq_handler(int irq, void *_palmas_usb)
                palmas_usb->linkstat = PALMAS_USB_STATE_DISCONNECT;
                extcon_set_cable_state(&palmas_usb->edev, "USB-HOST", false);
                dev_info(palmas_usb->dev, "USB-HOST cable is detached\n");
+       } else if ((palmas_usb->linkstat == PALMAS_USB_STATE_DISCONNECT) &&
+                               (id_src & PALMAS_USB_ID_INT_SRC_ID_GND)) {
+               palmas_usb->linkstat = PALMAS_USB_STATE_ID;
+               extcon_set_cable_state(&palmas_usb->edev, "USB-HOST", true);
+               dev_info(palmas_usb->dev, " USB-HOST cable is attached\n");
        }
 
        return IRQ_HANDLED;