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authorBrian Niebuhr <bniebuhr@efjohnson.com>2009-08-14 10:04:22 -0500
committerGreg Kroah-Hartman <gregkh@suse.de>2009-09-23 06:46:35 -0700
commit9b39e9ddedeef48569f8aac60a7b4c1fbb127c7d (patch)
treed2cc583190e18fa03298e84093c3346e1646007c /drivers/usb/gadget/ether.c
parent877accca79b706afe5d78b9a92cf4f22919fb2b0 (diff)
USB: gadget: Add EEM gadget driver
This patch adds a CDC EEM ethernet gadget driver. CDC EEM is a newer USB ethernet specification that uses a simpler interface than the older CDC ECM. This makes CDC EEM usable by a wider set of USB hardware. By default the ethernet gadget will still use CDC ECM/Subset, but kernel configuration and/or a module parameter will allow alternative use of the CDC EEM protocol. Changes since last version: - Brought in missing RNDIS changes that caused compile error - Modified 'sentinel CRC' checking to match EEM host driver Signed-off-by: Brian Niebuhr <bniebuhr@efjohnson.com> Cc: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/gadget/ether.c')
-rw-r--r--drivers/usb/gadget/ether.c31
1 files changed, 28 insertions, 3 deletions
diff --git a/drivers/usb/gadget/ether.c b/drivers/usb/gadget/ether.c
index bd102f5052b..f37de283d0a 100644
--- a/drivers/usb/gadget/ether.c
+++ b/drivers/usb/gadget/ether.c
@@ -61,6 +61,11 @@
* simpler, Microsoft pushes their own approach: RNDIS. The published
* RNDIS specs are ambiguous and appear to be incomplete, and are also
* needlessly complex. They borrow more from CDC ACM than CDC ECM.
+ *
+ * While CDC ECM, CDC Subset, and RNDIS are designed to extend the ethernet
+ * interface to the target, CDC EEM was designed to use ethernet over the USB
+ * link between the host and target. CDC EEM is implemented as an alternative
+ * to those other protocols when that communication model is more appropriate
*/
#define DRIVER_DESC "Ethernet Gadget"
@@ -114,6 +119,7 @@ static inline bool has_rndis(void)
#include "f_rndis.c"
#include "rndis.c"
#endif
+#include "f_eem.c"
#include "u_ether.c"
/*-------------------------------------------------------------------------*/
@@ -150,6 +156,10 @@ static inline bool has_rndis(void)
#define RNDIS_VENDOR_NUM 0x0525 /* NetChip */
#define RNDIS_PRODUCT_NUM 0xa4a2 /* Ethernet/RNDIS Gadget */
+/* For EEM gadgets */
+#define EEM_VENDOR_NUM 0x0525 /* INVALID - NEEDS TO BE ALLOCATED */
+#define EEM_PRODUCT_NUM 0xa4a1 /* INVALID - NEEDS TO BE ALLOCATED */
+
/*-------------------------------------------------------------------------*/
static struct usb_device_descriptor device_desc = {
@@ -246,8 +256,16 @@ static struct usb_configuration rndis_config_driver = {
/*-------------------------------------------------------------------------*/
+#ifdef CONFIG_USB_ETH_EEM
+static int use_eem = 1;
+#else
+static int use_eem;
+#endif
+module_param(use_eem, bool, 0);
+MODULE_PARM_DESC(use_eem, "use CDC EEM mode");
+
/*
- * We _always_ have an ECM or CDC Subset configuration.
+ * We _always_ have an ECM, CDC Subset, or EEM configuration.
*/
static int __init eth_do_config(struct usb_configuration *c)
{
@@ -258,7 +276,9 @@ static int __init eth_do_config(struct usb_configuration *c)
c->bmAttributes |= USB_CONFIG_ATT_WAKEUP;
}
- if (can_support_ecm(c->cdev->gadget))
+ if (use_eem)
+ return eem_bind_config(c);
+ else if (can_support_ecm(c->cdev->gadget))
return ecm_bind_config(c, hostaddr);
else
return geth_bind_config(c, hostaddr);
@@ -286,7 +306,12 @@ static int __init eth_bind(struct usb_composite_dev *cdev)
return status;
/* set up main config label and device descriptor */
- if (can_support_ecm(cdev->gadget)) {
+ if (use_eem) {
+ /* EEM */
+ eth_config_driver.label = "CDC Ethernet (EEM)";
+ device_desc.idVendor = cpu_to_le16(EEM_VENDOR_NUM);
+ device_desc.idProduct = cpu_to_le16(EEM_PRODUCT_NUM);
+ } else if (can_support_ecm(cdev->gadget)) {
/* ECM */
eth_config_driver.label = "CDC Ethernet (ECM)";
} else {