This driver can be used as a subdriver of another USB driver, allowing
it to export a Device Managment interface consisting of a single interrupt
endpoint with no dedicated USB interface.
Some devices provide a Device Management function combined with a wwan
function in a single USB interface having three endpoints (bulk in/out
+ interrupt). If the interrupt endpoint is used exclusively for DM
notifications, then this driver can support that as a subdriver
provided that the wwan driver calls the appropriate entry points on
probe, suspend, resume, reset and disconnect.
Signed-off-by: Bjørn Mork <bjorn@xxxxxxx>
---
drivers/usb/class/cdc-wdm.c | 36 ++++++++++++++++++++++++++++++++++++
include/linux/usb/cdc-wdm.h | 18 ++++++++++++++++++
2 files changed, 54 insertions(+), 0 deletions(-)
create mode 100644 include/linux/usb/cdc-wdm.h
diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c
index c86f8e5..9f2cfb5 100644
--- a/drivers/usb/class/cdc-wdm.c
+++ b/drivers/usb/class/cdc-wdm.c
@@ -23,6 +23,7 @@
#include <linux/usb/cdc.h>
#include <asm/byteorder.h>
#include <asm/unaligned.h>
+#include <linux/usb/cdc-wdm.h>
/*
* Version Information
@@ -797,6 +798,41 @@ err:
return rv;
}
+/**
+ * usb_cdc_wdm_register - register a WDM subdriver
+ * @intf: usb interface the subdriver will associate with
+ * @ep: interrupt endpoint to monitor for notifications
+ * @bufsize: maximum message size to support for read/write
+ *
+ * Create WDM usb class character device and associate it with intf
+ * without binding, allowing another driver to manage the interface.
+ *
+ * The subdriver will manage the given interrupt endpoint exclusively
+ * and will issue control requests referring to the given intf. It
+ * will otherwise avoid interferring, and in particular not do
+ * usb_set_intfdata/usb_get_intfdata on intf.
+ *
+ * The return value is a pointer to the subdriver's struct usb_driver.
+ * The registering driver is responsible for calling this subdriver's
+ * disconnect, suspend, resume, pre_reset and post_reset methods from
+ * its own.
+ */
+struct usb_driver *usb_cdc_wdm_register(struct usb_interface *intf,
+ struct usb_endpoint_descriptor *ep,
+ int bufsize)
+{
+ int rv = -EINVAL;
+
+ rv = wdm_create(intf, ep, bufsize);
+ if (rv < 0)
+ goto err;
+
+ return &wdm_driver;
+err:
+ return ERR_PTR(rv);
+}
+EXPORT_SYMBOL(usb_cdc_wdm_register);
+
static void wdm_disconnect(struct usb_interface *intf)
{
struct wdm_device *desc;
diff --git a/include/linux/usb/cdc-wdm.h b/include/linux/usb/cdc-wdm.h
new file mode 100644
index 0000000..f956137
--- /dev/null
+++ b/include/linux/usb/cdc-wdm.h
@@ -0,0 +1,18 @@
+/*
+ * USB CDC Device Management subdriver
+ *
+ * Copyright (c) 2012 Bjørn Mork <bjorn@xxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ */
+
+#ifndef __LINUX_USB_CDC_WDM_H
+#define __LINUX_USB_CDC_WDM_H
+
+extern struct usb_driver *usb_cdc_wdm_register(struct usb_interface *intf,
+ struct usb_endpoint_descriptor *ep,
+ int bufsize);
+
+#endif /* __LINUX_USB_CDC_WDM_H */
--
1.7.8.3
--
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