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229 lines
7.2 KiB
C
229 lines
7.2 KiB
C
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/*
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* Copyright (c) 2012 Bjørn Mork <bjorn@mork.no>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/netdevice.h>
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#include <linux/ethtool.h>
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#include <linux/mii.h>
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#include <linux/usb.h>
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#include <linux/usb/cdc.h>
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#include <linux/usb/usbnet.h>
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/* The name of the CDC Device Management driver */
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#define DM_DRIVER "cdc_wdm"
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/*
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* This driver supports wwan (3G/LTE/?) devices using a vendor
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* specific management protocol called Qualcomm MSM Interface (QMI) -
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* in addition to the more common AT commands over serial interface
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* management
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*
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* QMI is wrapped in CDC, using CDC encapsulated commands on the
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* control ("master") interface of a two-interface CDC Union
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* resembling standard CDC ECM. The devices do not use the control
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* interface for any other CDC messages. Most likely because the
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* management protocol is used in place of the standard CDC
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* notifications NOTIFY_NETWORK_CONNECTION and NOTIFY_SPEED_CHANGE
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*
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* Handling a protocol like QMI is out of the scope for any driver.
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* It can be exported as a character device using the cdc-wdm driver,
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* which will enable userspace applications ("modem managers") to
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* handle it. This may be required to use the network interface
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* provided by the driver.
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*
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* These devices may alternatively/additionally be configured using AT
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* commands on any of the serial interfaces driven by the option driver
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*
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* This driver binds only to the data ("slave") interface to enable
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* the cdc-wdm driver to bind to the control interface. It still
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* parses the CDC functional descriptors on the control interface to
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* a) verify that this is indeed a handled interface (CDC Union
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* header lists it as slave)
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* b) get MAC address and other ethernet config from the CDC Ethernet
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* header
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* c) enable user bind requests against the control interface, which
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* is the common way to bind to CDC Ethernet Control Model type
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* interfaces
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* d) provide a hint to the user about which interface is the
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* corresponding management interface
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*/
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static int qmi_wwan_bind(struct usbnet *dev, struct usb_interface *intf)
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{
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int status = -1;
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struct usb_interface *control = NULL;
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u8 *buf = intf->cur_altsetting->extra;
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int len = intf->cur_altsetting->extralen;
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struct usb_interface_descriptor *desc = &intf->cur_altsetting->desc;
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struct usb_cdc_union_desc *cdc_union = NULL;
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struct usb_cdc_ether_desc *cdc_ether = NULL;
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u32 required = 1 << USB_CDC_HEADER_TYPE | 1 << USB_CDC_UNION_TYPE;
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u32 found = 0;
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/*
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* assume a data interface has no additional descriptors and
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* that the control and data interface are numbered
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* consecutively - this holds for the Huawei device at least
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*/
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if (len == 0 && desc->bInterfaceNumber > 0) {
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control = usb_ifnum_to_if(dev->udev, desc->bInterfaceNumber - 1);
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if (!control)
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goto err;
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buf = control->cur_altsetting->extra;
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len = control->cur_altsetting->extralen;
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dev_dbg(&intf->dev, "guessing \"control\" => %s, \"data\" => this\n",
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dev_name(&control->dev));
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}
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while (len > 3) {
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struct usb_descriptor_header *h = (void *)buf;
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/* ignore any misplaced descriptors */
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if (h->bDescriptorType != USB_DT_CS_INTERFACE)
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goto next_desc;
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/* buf[2] is CDC descriptor subtype */
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switch (buf[2]) {
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case USB_CDC_HEADER_TYPE:
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if (found & 1 << USB_CDC_HEADER_TYPE) {
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dev_dbg(&intf->dev, "extra CDC header\n");
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goto err;
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}
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if (h->bLength != sizeof(struct usb_cdc_header_desc)) {
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dev_dbg(&intf->dev, "CDC header len %u\n", h->bLength);
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goto err;
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}
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break;
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case USB_CDC_UNION_TYPE:
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if (found & 1 << USB_CDC_UNION_TYPE) {
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dev_dbg(&intf->dev, "extra CDC union\n");
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goto err;
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}
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if (h->bLength != sizeof(struct usb_cdc_union_desc)) {
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dev_dbg(&intf->dev, "CDC union len %u\n", h->bLength);
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goto err;
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}
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cdc_union = (struct usb_cdc_union_desc *)buf;
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break;
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case USB_CDC_ETHERNET_TYPE:
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if (found & 1 << USB_CDC_ETHERNET_TYPE) {
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dev_dbg(&intf->dev, "extra CDC ether\n");
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goto err;
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}
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if (h->bLength != sizeof(struct usb_cdc_ether_desc)) {
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dev_dbg(&intf->dev, "CDC ether len %u\n", h->bLength);
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goto err;
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}
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cdc_ether = (struct usb_cdc_ether_desc *)buf;
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break;
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}
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/*
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* Remember which CDC functional descriptors we've seen. Works
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* for all types we care about, of which USB_CDC_ETHERNET_TYPE
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* (0x0f) is the highest numbered
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*/
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if (buf[2] < 32)
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found |= 1 << buf[2];
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next_desc:
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len -= h->bLength;
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buf += h->bLength;
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}
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/* did we find all the required ones? */
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if ((found & required) != required) {
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dev_err(&intf->dev, "CDC functional descriptors missing\n");
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goto err;
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}
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/* give the user a helpful hint if trying to bind to the wrong interface */
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if (cdc_union && desc->bInterfaceNumber == cdc_union->bMasterInterface0) {
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dev_err(&intf->dev, "leaving \"control\" interface for " DM_DRIVER " - try binding to %s instead!\n",
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dev_name(&usb_ifnum_to_if(dev->udev, cdc_union->bSlaveInterface0)->dev));
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goto err;
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}
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/* errors aren't fatal - we can live with the dynamic address */
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if (cdc_ether) {
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dev->hard_mtu = le16_to_cpu(cdc_ether->wMaxSegmentSize);
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usbnet_get_ethernet_addr(dev, cdc_ether->iMACAddress);
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}
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/* success! point the user to the management interface */
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if (control)
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dev_info(&intf->dev, "Use \"" DM_DRIVER "\" for QMI interface %s\n",
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dev_name(&control->dev));
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/* XXX: add a sysfs symlink somewhere to help management applications find it? */
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/* collect bulk endpoints now that we know intf == "data" interface */
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status = usbnet_get_endpoints(dev, intf);
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err:
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return status;
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}
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/* stolen from cdc_ether.c */
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static int qmi_wwan_manage_power(struct usbnet *dev, int on)
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{
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dev->intf->needs_remote_wakeup = on;
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return 0;
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}
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static const struct driver_info qmi_wwan_info = {
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.description = "QMI speaking wwan device",
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.flags = FLAG_WWAN,
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.bind = qmi_wwan_bind,
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.manage_power = qmi_wwan_manage_power,
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};
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#define HUAWEI_VENDOR_ID 0x12D1
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static const struct usb_device_id products[] = {
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{
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/* Huawei E392, E398 and possibly others sharing both device id and more... */
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.match_flags = USB_DEVICE_ID_MATCH_VENDOR | USB_DEVICE_ID_MATCH_INT_INFO,
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.idVendor = HUAWEI_VENDOR_ID,
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.bInterfaceClass = USB_CLASS_VENDOR_SPEC,
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.bInterfaceSubClass = 1,
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.bInterfaceProtocol = 8, /* NOTE: This is the *slave* interface of the CDC Union! */
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.driver_info = (unsigned long)&qmi_wwan_info,
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}, {
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}, /* END */
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};
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MODULE_DEVICE_TABLE(usb, products);
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static struct usb_driver qmi_wwan_driver = {
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.name = "qmi_wwan",
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.id_table = products,
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.probe = usbnet_probe,
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.disconnect = usbnet_disconnect,
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.suspend = usbnet_suspend,
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.resume = usbnet_resume,
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.reset_resume = usbnet_resume,
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.supports_autosuspend = 1,
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};
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static int __init qmi_wwan_init(void)
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{
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return usb_register(&qmi_wwan_driver);
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}
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module_init(qmi_wwan_init);
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static void __exit qmi_wwan_exit(void)
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{
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usb_deregister(&qmi_wwan_driver);
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}
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module_exit(qmi_wwan_exit);
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MODULE_AUTHOR("Bjørn Mork <bjorn@mork.no>");
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MODULE_DESCRIPTION("Qualcomm MSM Interface (QMI) WWAN driver");
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MODULE_LICENSE("GPL");
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