linux-kernel - [PATCH v2 2/2] extcon: usb-gpio: Update the ID pin state of USB when cable state is changed

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Date:	Wed, 27 May 2015 21:15:10 +0900
From:	Chanwoo Choi <cwchoi00@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	rogerq@...com, r.baldyga@...sung.com, peter.chen@...escale.com,
	kishon@...com, balbi@...com, iivanov@...sol.com,
	cw00.choi@...sung.com, myungjoo.ham@...sung.com
Subject: [PATCH v2 2/2] extcon: usb-gpio: Update the ID pin state of USB when cable state is changed

This patch updates the ID pin state of USB when cable state is changed
by using the extcon_set_cable_line_state() function. The extcon consumer driver
can receive the changed ID pin state through registered notifier chain of
extcon consumer driver.

Cc: Roger Quadros <rogerq@...com>
Cc: Robert Baldyga <r.baldyga@...sung.com>
Cc: MyungJoo Ham <myungjoo.ham@...sung.com>
Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
---
 drivers/extcon/extcon-usb-gpio.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/extcon/extcon-usb-gpio.c b/drivers/extcon/extcon-usb-gpio.c
index 14da94c..9ff3171 100644
--- a/drivers/extcon/extcon-usb-gpio.c
+++ b/drivers/extcon/extcon-usb-gpio.c
@@ -62,12 +62,18 @@ static void usb_extcon_detect_cable(struct work_struct *work)
 		 */
 		extcon_set_cable_state_(info->edev, EXTCON_USB_HOST, false);
 		extcon_set_cable_state_(info->edev, EXTCON_USB, true);
+
+		extcon_set_cable_line_state(info->edev, EXTCON_USB,
+						EXTCON_USB_ID_HIGH);
 	} else {
 		/*
 		 * ID = 0 means USB HOST cable attached.
 		 * As we don't have event for USB peripheral cable detached,
 		 * we simulate USB peripheral detach here.
 		 */
+		extcon_set_cable_line_state(info->edev, EXTCON_USB,
+						EXTCON_USB_ID_LOW);
+
 		extcon_set_cable_state_(info->edev, EXTCON_USB, false);
 		extcon_set_cable_state_(info->edev, EXTCON_USB_HOST, true);
 	}
-- 
2.2.0.GIT

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