usb: phy: Handle per-PHY event for connnect and disconnect events

When usb is connected and enumerated in device mode or when
usb is disconnected, call usb_phy_set_event() from phy drivers
to handle per-PHY event.

[ toddpoynor@google.com : Original patch in Android ]

Cc: Felipe Balbi <balbi@ti.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-kernel@vger.kernel.org
Cc: linux-usb@vger.kernel.org
Cc: Android Kernel Team <kernel-team@android.com>
Cc: John Stultz <john.stultz@linaro.org>
Cc: Sumit Semwal <sumit.semwal@linaro.org>
Cc: Arve Hjønnevåg <arve@android.com>
Cc: Benoit Goby <benoit@android.com>
Cc: Todd Poynor <toddpoynor@google.com>
Signed-off-by: Kiran Raparthy <kiran.kumar@linaro.org>
Signed-off-by: Felipe Balbi <balbi@ti.com>

drivers/usb/phy/phy-ab8500-usb.c

@@ -445,6 +445,7 @@ static int ab9540_usb_link_status_update(struct ab8500_usb *ab,
 			event = UX500_MUSB_NONE;
 		/* Fallback to default B_IDLE as nothing is connected. */
 		ab->phy.otg->state = OTG_STATE_B_IDLE;
+		usb_phy_set_event(&ab->phy, USB_EVENT_NONE);
 		break;
 
 	case USB_LINK_ACA_RID_C_NM_9540:
@@ -459,12 +460,14 @@ static int ab9540_usb_link_status_update(struct ab8500_usb *ab,
 			ab8500_usb_peri_phy_en(ab);
 			atomic_notifier_call_chain(&ab->phy.notifier,
 					UX500_MUSB_PREPARE, &ab->vbus_draw);
+			usb_phy_set_event(&ab->phy, USB_EVENT_ENUMERATED);
 		}
 		if (ab->mode == USB_IDLE) {
 			ab->mode = USB_PERIPHERAL;
 			ab8500_usb_peri_phy_en(ab);
 			atomic_notifier_call_chain(&ab->phy.notifier,
 					UX500_MUSB_PREPARE, &ab->vbus_draw);
+			usb_phy_set_event(&ab->phy, USB_EVENT_ENUMERATED);
 		}
 		if (event != UX500_MUSB_RIDC)
 			event = UX500_MUSB_VBUS;
@@ -500,6 +503,7 @@ static int ab9540_usb_link_status_update(struct ab8500_usb *ab,
 		event = UX500_MUSB_CHARGER;
 		atomic_notifier_call_chain(&ab->phy.notifier,
 				event, &ab->vbus_draw);
+		usb_phy_set_event(&ab->phy, USB_EVENT_CHARGER);
 		break;
 
 	case USB_LINK_PHYEN_NO_VBUS_NO_IDGND_9540:
@@ -524,6 +528,7 @@ static int ab9540_usb_link_status_update(struct ab8500_usb *ab,
 				ab->mode = USB_IDLE;
 				ab->phy.otg->default_a = false;
 				ab->vbus_draw = 0;
+				usb_phy_set_event(&ab->phy, USB_EVENT_NONE);
 			}
 		}
 		break;
@@ -583,6 +588,7 @@ static int ab8540_usb_link_status_update(struct ab8500_usb *ab,
 		 * is connected
 		 */
 		ab->phy.otg->state = OTG_STATE_B_IDLE;
+		usb_phy_set_event(&ab->phy, USB_EVENT_NONE);
 		break;
 
 	case USB_LINK_ACA_RID_C_NM_8540:
@@ -596,6 +602,7 @@ static int ab8540_usb_link_status_update(struct ab8500_usb *ab,
 			ab8500_usb_peri_phy_en(ab);
 			atomic_notifier_call_chain(&ab->phy.notifier,
 					UX500_MUSB_PREPARE, &ab->vbus_draw);
+			usb_phy_set_event(&ab->phy, USB_EVENT_ENUMERATED);
 		}
 		if (event != UX500_MUSB_RIDC)
 			event = UX500_MUSB_VBUS;
@@ -624,6 +631,7 @@ static int ab8540_usb_link_status_update(struct ab8500_usb *ab,
 		event = UX500_MUSB_CHARGER;
 		atomic_notifier_call_chain(&ab->phy.notifier,
 				event, &ab->vbus_draw);
+		usb_phy_set_event(&ab->phy, USB_EVENT_CHARGER);
 		break;
 
 	case USB_LINK_PHYEN_NO_VBUS_NO_IDGND_8540:
@@ -646,6 +654,7 @@ static int ab8540_usb_link_status_update(struct ab8500_usb *ab,
 			ab->mode = USB_IDLE;
 			ab->phy.otg->default_a = false;
 			ab->vbus_draw = 0;
+		usb_phy_set_event(&ab->phy, USB_EVENT_NONE);
 		}
 		break;
 
@@ -692,6 +701,7 @@ static int ab8505_usb_link_status_update(struct ab8500_usb *ab,
 		 * is connected
 		 */
 		ab->phy.otg->state = OTG_STATE_B_IDLE;
+		usb_phy_set_event(&ab->phy, USB_EVENT_NONE);
 		break;
 
 	case USB_LINK_ACA_RID_C_NM_8505:
@@ -705,6 +715,7 @@ static int ab8505_usb_link_status_update(struct ab8500_usb *ab,
 			ab8500_usb_peri_phy_en(ab);
 			atomic_notifier_call_chain(&ab->phy.notifier,
 					UX500_MUSB_PREPARE, &ab->vbus_draw);
+			usb_phy_set_event(&ab->phy, USB_EVENT_ENUMERATED);
 		}
 		if (event != UX500_MUSB_RIDC)
 			event = UX500_MUSB_VBUS;
@@ -732,6 +743,7 @@ static int ab8505_usb_link_status_update(struct ab8500_usb *ab,
 		event = UX500_MUSB_CHARGER;
 		atomic_notifier_call_chain(&ab->phy.notifier,
 				event, &ab->vbus_draw);
+		usb_phy_set_event(&ab->phy, USB_EVENT_CHARGER);
 		break;
 
 	default:
@@ -775,6 +787,7 @@ static int ab8500_usb_link_status_update(struct ab8500_usb *ab,
 			event = UX500_MUSB_NONE;
 		/* Fallback to default B_IDLE as nothing is connected */
 		ab->phy.otg->state = OTG_STATE_B_IDLE;
+		usb_phy_set_event(&ab->phy, USB_EVENT_NONE);
 		break;
 
 	case USB_LINK_ACA_RID_C_NM_8500:
@@ -792,6 +805,7 @@ static int ab8500_usb_link_status_update(struct ab8500_usb *ab,
 			ab8500_usb_peri_phy_en(ab);
 			atomic_notifier_call_chain(&ab->phy.notifier,
 					UX500_MUSB_PREPARE, &ab->vbus_draw);
+			usb_phy_set_event(&ab->phy, USB_EVENT_ENUMERATED);
 		}
 		if (event != UX500_MUSB_RIDC)
 			event = UX500_MUSB_VBUS;
@@ -818,6 +832,7 @@ static int ab8500_usb_link_status_update(struct ab8500_usb *ab,
 		event = UX500_MUSB_CHARGER;
 		atomic_notifier_call_chain(&ab->phy.notifier,
 				event, &ab->vbus_draw);
+		usb_phy_set_event(&ab->phy, USB_EVENT_CHARGER);
 		break;
 
 	case USB_LINK_RESERVED_8500:

drivers/usb/phy/phy-gpio-vbus-usb.c

@@ -134,6 +134,7 @@ static void gpio_vbus_work(struct work_struct *work)
 
 		atomic_notifier_call_chain(&gpio_vbus->phy.notifier,
 					   status, gpio_vbus->phy.otg->gadget);
+		usb_phy_set_event(&gpio_vbus->phy, USB_EVENT_ENUMERATED);
 	} else {
 		/* optionally disable D+ pullup */
 		if (gpio_is_valid(gpio))
@@ -148,6 +149,7 @@ static void gpio_vbus_work(struct work_struct *work)
 
 		atomic_notifier_call_chain(&gpio_vbus->phy.notifier,
 					   status, gpio_vbus->phy.otg->gadget);
+		usb_phy_set_event(&gpio_vbus->phy, USB_EVENT_NONE);
 	}
 }
 

drivers/usb/phy/phy-mv-usb.c

@@ -441,10 +441,12 @@ run:
 				mv_otg_start_periphrals(mvotg, 0);
 			mv_otg_reset(mvotg);
 			mv_otg_disable(mvotg);
+			usb_phy_set_event(&mvotg->phy, USB_EVENT_NONE);
 			break;
 		case OTG_STATE_B_PERIPHERAL:
 			mv_otg_enable(mvotg);
 			mv_otg_start_periphrals(mvotg, 1);
+			usb_phy_set_event(&mvotg->phy, USB_EVENT_ENUMERATED);
 			break;
 		case OTG_STATE_A_IDLE:
 			otg->default_a = 1;

drivers/usb/phy/phy-tahvo.c

@@ -87,6 +87,7 @@ static void check_vbus_state(struct tahvo_usb *tu)
 			if (tu->phy.otg->gadget)
 				usb_gadget_vbus_connect(tu->phy.otg->gadget);
 			tu->phy.otg->state = OTG_STATE_B_PERIPHERAL;
+			usb_phy_set_event(&tu->phy, USB_EVENT_ENUMERATED);
 			break;
 		case OTG_STATE_A_IDLE:
 			/*
@@ -105,6 +106,7 @@ static void check_vbus_state(struct tahvo_usb *tu)
 			if (tu->phy.otg->gadget)
 				usb_gadget_vbus_disconnect(tu->phy.otg->gadget);
 			tu->phy.otg->state = OTG_STATE_B_IDLE;
+			usb_phy_set_event(&tu->phy, USB_EVENT_NONE);
 			break;
 		case OTG_STATE_A_HOST:
 			tu->phy.otg->state = OTG_STATE_A_IDLE;