linux-kernel - [PATCHv3 2/5] usb: gadge: configfs: pass UDC name via usb_gadget

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Date:	Tue, 17 Feb 2015 23:17:54 +0200
From:	Ruslan Bilovol <ruslan.bilovol@...il.com>
To:	balbi@...com
Cc:	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	k.opasiak@...sung.com, stern@...land.harvard.edu,
	peter.chen@...escale.com, gregkh@...uxfoundation.org,
	andrzej.p@...sung.com
Subject: [PATCHv3 2/5] usb: gadge: configfs: pass UDC name via usb_gadget_driver struct

Now when udc-core supports binding to specific UDC by passing
its name via 'udc_name' member of usb_gadget_driver struct,
switch to this generic approach.

Signed-off-by: Ruslan Bilovol <ruslan.bilovol@...il.com>
---
 drivers/usb/gadget/configfs.c | 27 ++++++++++++++-------------
 1 file changed, 14 insertions(+), 13 deletions(-)

diff --git a/drivers/usb/gadget/configfs.c b/drivers/usb/gadget/configfs.c
index 7564814..b6aae63 100644
--- a/drivers/usb/gadget/configfs.c
+++ b/drivers/usb/gadget/configfs.c
@@ -54,7 +54,6 @@ struct gadget_info {
 	struct list_head string_list;
 	struct list_head available_func;
 
-	const char *udc_name;
 #ifdef CONFIG_USB_OTG
 	struct usb_otg_descriptor otg;
 #endif
@@ -230,21 +229,21 @@ static ssize_t gadget_dev_desc_bcdUSB_store(struct gadget_info *gi,
 
 static ssize_t gadget_dev_desc_UDC_show(struct gadget_info *gi, char *page)
 {
-	return sprintf(page, "%s\n", gi->udc_name ?: "");
+	return sprintf(page, "%s\n", gi->composite.gadget_driver.udc_name ?: "");
 }
 
 static int unregister_gadget(struct gadget_info *gi)
 {
 	int ret;
 
-	if (!gi->udc_name)
+	if (!gi->composite.gadget_driver.udc_name)
 		return -ENODEV;
 
 	ret = usb_gadget_unregister_driver(&gi->composite.gadget_driver);
 	if (ret)
 		return ret;
-	kfree(gi->udc_name);
-	gi->udc_name = NULL;
+	kfree(gi->composite.gadget_driver.udc_name);
+	gi->composite.gadget_driver.udc_name = NULL;
 	return 0;
 }
 
@@ -267,14 +266,16 @@ static ssize_t gadget_dev_desc_UDC_store(struct gadget_info *gi,
 		if (ret)
 			goto err;
 	} else {
-		if (gi->udc_name) {
+		if (gi->composite.gadget_driver.udc_name) {
 			ret = -EBUSY;
 			goto err;
 		}
-		ret = usb_udc_attach_driver(name, &gi->composite.gadget_driver);
-		if (ret)
+		gi->composite.gadget_driver.udc_name = name;
+		ret = usb_gadget_probe_driver(&gi->composite.gadget_driver);
+		if (ret) {
+			gi->composite.gadget_driver.udc_name = NULL;
 			goto err;
-		gi->udc_name = name;
+		}
 	}
 	mutex_unlock(&gi->lock);
 	return len;
@@ -438,9 +439,9 @@ static int config_usb_cfg_unlink(
 	 * remove the function.
 	 */
 	mutex_lock(&gi->lock);
-	if (gi->udc_name)
+	if (gi->composite.gadget_driver.udc_name)
 		unregister_gadget(gi);
-	WARN_ON(gi->udc_name);
+	WARN_ON(gi->composite.gadget_driver.udc_name);
 
 	list_for_each_entry(f, &cfg->func_list, list) {
 		if (f->fi == fi) {
@@ -917,10 +918,10 @@ static int os_desc_unlink(struct config_item *os_desc_ci,
 	struct usb_composite_dev *cdev = &gi->cdev;
 
 	mutex_lock(&gi->lock);
-	if (gi->udc_name)
+	if (gi->composite.gadget_driver.udc_name)
 		unregister_gadget(gi);
 	cdev->os_desc_config = NULL;
-	WARN_ON(gi->udc_name);
+	WARN_ON(gi->composite.gadget_driver.udc_name);
 	mutex_unlock(&gi->lock);
 	return 0;
 }
-- 
1.9.1

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