netdev - [PATCH 1/5] usb: cdc-ncm: Change alternate setting magic numbers into #defines

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Date:	Wed, 15 Feb 2012 14:47:37 +0000
From:	Toby Gray <toby.gray@...lvnc.com>
To:	Toby Gray <tg@...lvnc.com>, Oliver Neukum <oliver@...kum.name>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-usb@...r.kernel.org
Cc:	netdev@...r.kernel.org, alexey.orishko@...il.com,
	Toby Gray <toby.gray@...lvnc.com>
Subject: [PATCH 1/5] usb: cdc-ncm: Change alternate setting magic numbers into #defines

The CDC NCM specification describes the alternate settings that a CDC
NCM interface must support. Alternate setting 0 does not allow any
network traffic but allows configuration of the interface. Alternate 1
allows network traffic but doesn't allow configuration of some of the
interface properties.

This change provides #defines for there two numbers to clarify why
usb_set_interface is being called.

Signed-off-by: Toby Gray <toby.gray@...lvnc.com>
---
 drivers/net/usb/cdc_ncm.c |   11 +++++++++--
 1 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/net/usb/cdc_ncm.c b/drivers/net/usb/cdc_ncm.c
index 3a539a9..3df51ee 100644
--- a/drivers/net/usb/cdc_ncm.c
+++ b/drivers/net/usb/cdc_ncm.c
@@ -87,6 +87,13 @@
 	(sizeof(struct usb_cdc_ncm_nth16) + sizeof(struct usb_cdc_ncm_ndp16) + \
 	(CDC_NCM_DPT_DATAGRAMS_MAX + 1) * sizeof(struct usb_cdc_ncm_dpe16))
 
+/* CDC NCM ch. 5.3 describes alternate setting 0 as having no
+ * endpoints and therefore not allowing any networking traffic. */
+#define	CDC_NCM_ALTSETTING_RESET	0
+/* CDC NCM ch. 5.3 describes alternate setting 1 as having the
+ * required bulk endpoints for normal operation. */
+#define	CDC_NCM_ALTSETTING_DATA		1
+
 struct cdc_ncm_data {
 	struct usb_cdc_ncm_nth16 nth16;
 	struct usb_cdc_ncm_ndp16 ndp16;
@@ -549,7 +556,7 @@ advance:
 	iface_no = ctx->data->cur_altsetting->desc.bInterfaceNumber;
 
 	/* reset data interface */
-	temp = usb_set_interface(dev->udev, iface_no, 0);
+	temp = usb_set_interface(dev->udev, iface_no, CDC_NCM_ALTSETTING_RESET);
 	if (temp)
 		goto error2;
 
@@ -558,7 +565,7 @@ advance:
 		goto error2;
 
 	/* configure data interface */
-	temp = usb_set_interface(dev->udev, iface_no, 1);
+	temp = usb_set_interface(dev->udev, iface_no, CDC_NCM_ALTSETTING_DATA);
 	if (temp)
 		goto error2;
 
-- 
1.7.0.4

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