summaryrefslogtreecommitdiff
path: root/drivers/net/usb/qmi_wwan.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/net/usb/qmi_wwan.c')
-rw-r--r--drivers/net/usb/qmi_wwan.c444
1 files changed, 444 insertions, 0 deletions
diff --git a/drivers/net/usb/qmi_wwan.c b/drivers/net/usb/qmi_wwan.c
new file mode 100644
index 000000000000..e14479dd2438
--- /dev/null
+++ b/drivers/net/usb/qmi_wwan.c
@@ -0,0 +1,444 @@
+/*
+ * Copyright (c) 2012 Bjørn Mork <bjorn@mork.no>
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/ethtool.h>
+#include <linux/mii.h>
+#include <linux/usb.h>
+#include <linux/usb/cdc.h>
+#include <linux/usb/usbnet.h>
+#include <linux/usb/cdc-wdm.h>
+
+/* The name of the CDC Device Management driver */
+#define DM_DRIVER "cdc_wdm"
+
+/*
+ * This driver supports wwan (3G/LTE/?) devices using a vendor
+ * specific management protocol called Qualcomm MSM Interface (QMI) -
+ * in addition to the more common AT commands over serial interface
+ * management
+ *
+ * QMI is wrapped in CDC, using CDC encapsulated commands on the
+ * control ("master") interface of a two-interface CDC Union
+ * resembling standard CDC ECM. The devices do not use the control
+ * interface for any other CDC messages. Most likely because the
+ * management protocol is used in place of the standard CDC
+ * notifications NOTIFY_NETWORK_CONNECTION and NOTIFY_SPEED_CHANGE
+ *
+ * Handling a protocol like QMI is out of the scope for any driver.
+ * It can be exported as a character device using the cdc-wdm driver,
+ * which will enable userspace applications ("modem managers") to
+ * handle it. This may be required to use the network interface
+ * provided by the driver.
+ *
+ * These devices may alternatively/additionally be configured using AT
+ * commands on any of the serial interfaces driven by the option driver
+ *
+ * This driver binds only to the data ("slave") interface to enable
+ * the cdc-wdm driver to bind to the control interface. It still
+ * parses the CDC functional descriptors on the control interface to
+ * a) verify that this is indeed a handled interface (CDC Union
+ * header lists it as slave)
+ * b) get MAC address and other ethernet config from the CDC Ethernet
+ * header
+ * c) enable user bind requests against the control interface, which
+ * is the common way to bind to CDC Ethernet Control Model type
+ * interfaces
+ * d) provide a hint to the user about which interface is the
+ * corresponding management interface
+ */
+
+static int qmi_wwan_bind(struct usbnet *dev, struct usb_interface *intf)
+{
+ int status = -1;
+ struct usb_interface *control = NULL;
+ u8 *buf = intf->cur_altsetting->extra;
+ int len = intf->cur_altsetting->extralen;
+ struct usb_interface_descriptor *desc = &intf->cur_altsetting->desc;
+ struct usb_cdc_union_desc *cdc_union = NULL;
+ struct usb_cdc_ether_desc *cdc_ether = NULL;
+ u32 required = 1 << USB_CDC_HEADER_TYPE | 1 << USB_CDC_UNION_TYPE;
+ u32 found = 0;
+ atomic_t *pmcount = (void *)&dev->data[1];
+
+ atomic_set(pmcount, 0);
+
+ /*
+ * assume a data interface has no additional descriptors and
+ * that the control and data interface are numbered
+ * consecutively - this holds for the Huawei device at least
+ */
+ if (len == 0 && desc->bInterfaceNumber > 0) {
+ control = usb_ifnum_to_if(dev->udev, desc->bInterfaceNumber - 1);
+ if (!control)
+ goto err;
+
+ buf = control->cur_altsetting->extra;
+ len = control->cur_altsetting->extralen;
+ dev_dbg(&intf->dev, "guessing \"control\" => %s, \"data\" => this\n",
+ dev_name(&control->dev));
+ }
+
+ while (len > 3) {
+ struct usb_descriptor_header *h = (void *)buf;
+
+ /* ignore any misplaced descriptors */
+ if (h->bDescriptorType != USB_DT_CS_INTERFACE)
+ goto next_desc;
+
+ /* buf[2] is CDC descriptor subtype */
+ switch (buf[2]) {
+ case USB_CDC_HEADER_TYPE:
+ if (found & 1 << USB_CDC_HEADER_TYPE) {
+ dev_dbg(&intf->dev, "extra CDC header\n");
+ goto err;
+ }
+ if (h->bLength != sizeof(struct usb_cdc_header_desc)) {
+ dev_dbg(&intf->dev, "CDC header len %u\n", h->bLength);
+ goto err;
+ }
+ break;
+ case USB_CDC_UNION_TYPE:
+ if (found & 1 << USB_CDC_UNION_TYPE) {
+ dev_dbg(&intf->dev, "extra CDC union\n");
+ goto err;
+ }
+ if (h->bLength != sizeof(struct usb_cdc_union_desc)) {
+ dev_dbg(&intf->dev, "CDC union len %u\n", h->bLength);
+ goto err;
+ }
+ cdc_union = (struct usb_cdc_union_desc *)buf;
+ break;
+ case USB_CDC_ETHERNET_TYPE:
+ if (found & 1 << USB_CDC_ETHERNET_TYPE) {
+ dev_dbg(&intf->dev, "extra CDC ether\n");
+ goto err;
+ }
+ if (h->bLength != sizeof(struct usb_cdc_ether_desc)) {
+ dev_dbg(&intf->dev, "CDC ether len %u\n", h->bLength);
+ goto err;
+ }
+ cdc_ether = (struct usb_cdc_ether_desc *)buf;
+ break;
+ }
+
+ /*
+ * Remember which CDC functional descriptors we've seen. Works
+ * for all types we care about, of which USB_CDC_ETHERNET_TYPE
+ * (0x0f) is the highest numbered
+ */
+ if (buf[2] < 32)
+ found |= 1 << buf[2];
+
+next_desc:
+ len -= h->bLength;
+ buf += h->bLength;
+ }
+
+ /* did we find all the required ones? */
+ if ((found & required) != required) {
+ dev_err(&intf->dev, "CDC functional descriptors missing\n");
+ goto err;
+ }
+
+ /* give the user a helpful hint if trying to bind to the wrong interface */
+ if (cdc_union && desc->bInterfaceNumber == cdc_union->bMasterInterface0) {
+ dev_err(&intf->dev, "leaving \"control\" interface for " DM_DRIVER " - try binding to %s instead!\n",
+ dev_name(&usb_ifnum_to_if(dev->udev, cdc_union->bSlaveInterface0)->dev));
+ goto err;
+ }
+
+ /* errors aren't fatal - we can live with the dynamic address */
+ if (cdc_ether) {
+ dev->hard_mtu = le16_to_cpu(cdc_ether->wMaxSegmentSize);
+ usbnet_get_ethernet_addr(dev, cdc_ether->iMACAddress);
+ }
+
+ /* success! point the user to the management interface */
+ if (control)
+ dev_info(&intf->dev, "Use \"" DM_DRIVER "\" for QMI interface %s\n",
+ dev_name(&control->dev));
+
+ /* XXX: add a sysfs symlink somewhere to help management applications find it? */
+
+ /* collect bulk endpoints now that we know intf == "data" interface */
+ status = usbnet_get_endpoints(dev, intf);
+
+err:
+ return status;
+}
+
+/* using a counter to merge subdriver requests with our own into a combined state */
+static int qmi_wwan_manage_power(struct usbnet *dev, int on)
+{
+ atomic_t *pmcount = (void *)&dev->data[1];
+ int rv = 0;
+
+ dev_dbg(&dev->intf->dev, "%s() pmcount=%d, on=%d\n", __func__, atomic_read(pmcount), on);
+
+ if ((on && atomic_add_return(1, pmcount) == 1) || (!on && atomic_dec_and_test(pmcount))) {
+ /* need autopm_get/put here to ensure the usbcore sees the new value */
+ rv = usb_autopm_get_interface(dev->intf);
+ if (rv < 0)
+ goto err;
+ dev->intf->needs_remote_wakeup = on;
+ usb_autopm_put_interface(dev->intf);
+ }
+err:
+ return rv;
+}
+
+static int qmi_wwan_cdc_wdm_manage_power(struct usb_interface *intf, int on)
+{
+ struct usbnet *dev = usb_get_intfdata(intf);
+ return qmi_wwan_manage_power(dev, on);
+}
+
+/* Some devices combine the "control" and "data" functions into a
+ * single interface with all three endpoints: interrupt + bulk in and
+ * out
+ *
+ * Setting up cdc-wdm as a subdriver owning the interrupt endpoint
+ * will let it provide userspace access to the encapsulated QMI
+ * protocol without interfering with the usbnet operations.
+ */
+static int qmi_wwan_bind_shared(struct usbnet *dev, struct usb_interface *intf)
+{
+ int rv;
+ struct usb_driver *subdriver = NULL;
+ atomic_t *pmcount = (void *)&dev->data[1];
+
+ atomic_set(pmcount, 0);
+
+ /* collect all three endpoints */
+ rv = usbnet_get_endpoints(dev, intf);
+ if (rv < 0)
+ goto err;
+
+ /* require interrupt endpoint for subdriver */
+ if (!dev->status) {
+ rv = -EINVAL;
+ goto err;
+ }
+
+ subdriver = usb_cdc_wdm_register(intf, &dev->status->desc, 512, &qmi_wwan_cdc_wdm_manage_power);
+ if (IS_ERR(subdriver)) {
+ rv = PTR_ERR(subdriver);
+ goto err;
+ }
+
+ /* can't let usbnet use the interrupt endpoint */
+ dev->status = NULL;
+
+ /* save subdriver struct for suspend/resume wrappers */
+ dev->data[0] = (unsigned long)subdriver;
+
+err:
+ return rv;
+}
+
+/* Gobi devices uses identical class/protocol codes for all interfaces regardless
+ * of function. Some of these are CDC ACM like and have the exact same endpoints
+ * we are looking for. This leaves two possible strategies for identifying the
+ * correct interface:
+ * a) hardcoding interface number, or
+ * b) use the fact that the wwan interface is the only one lacking additional
+ * (CDC functional) descriptors
+ *
+ * Let's see if we can get away with the generic b) solution.
+ */
+static int qmi_wwan_bind_gobi(struct usbnet *dev, struct usb_interface *intf)
+{
+ int rv = -EINVAL;
+
+ /* ignore any interface with additional descriptors */
+ if (intf->cur_altsetting->extralen)
+ goto err;
+
+ rv = qmi_wwan_bind_shared(dev, intf);
+err:
+ return rv;
+}
+
+static void qmi_wwan_unbind_shared(struct usbnet *dev, struct usb_interface *intf)
+{
+ struct usb_driver *subdriver = (void *)dev->data[0];
+
+ if (subdriver && subdriver->disconnect)
+ subdriver->disconnect(intf);
+
+ dev->data[0] = (unsigned long)NULL;
+}
+
+/* suspend/resume wrappers calling both usbnet and the cdc-wdm
+ * subdriver if present.
+ *
+ * NOTE: cdc-wdm also supports pre/post_reset, but we cannot provide
+ * wrappers for those without adding usbnet reset support first.
+ */
+static int qmi_wwan_suspend(struct usb_interface *intf, pm_message_t message)
+{
+ struct usbnet *dev = usb_get_intfdata(intf);
+ struct usb_driver *subdriver = (void *)dev->data[0];
+ int ret;
+
+ ret = usbnet_suspend(intf, message);
+ if (ret < 0)
+ goto err;
+
+ if (subdriver && subdriver->suspend)
+ ret = subdriver->suspend(intf, message);
+ if (ret < 0)
+ usbnet_resume(intf);
+err:
+ return ret;
+}
+
+static int qmi_wwan_resume(struct usb_interface *intf)
+{
+ struct usbnet *dev = usb_get_intfdata(intf);
+ struct usb_driver *subdriver = (void *)dev->data[0];
+ int ret = 0;
+
+ if (subdriver && subdriver->resume)
+ ret = subdriver->resume(intf);
+ if (ret < 0)
+ goto err;
+ ret = usbnet_resume(intf);
+ if (ret < 0 && subdriver && subdriver->resume && subdriver->suspend)
+ subdriver->suspend(intf, PMSG_SUSPEND);
+err:
+ return ret;
+}
+
+
+static const struct driver_info qmi_wwan_info = {
+ .description = "QMI speaking wwan device",
+ .flags = FLAG_WWAN,
+ .bind = qmi_wwan_bind,
+ .manage_power = qmi_wwan_manage_power,
+};
+
+static const struct driver_info qmi_wwan_shared = {
+ .description = "QMI speaking wwan device with combined interface",
+ .flags = FLAG_WWAN,
+ .bind = qmi_wwan_bind_shared,
+ .unbind = qmi_wwan_unbind_shared,
+ .manage_power = qmi_wwan_manage_power,
+};
+
+static const struct driver_info qmi_wwan_gobi = {
+ .description = "Qualcomm Gobi wwan/QMI device",
+ .flags = FLAG_WWAN,
+ .bind = qmi_wwan_bind_gobi,
+ .unbind = qmi_wwan_unbind_shared,
+ .manage_power = qmi_wwan_manage_power,
+};
+
+#define HUAWEI_VENDOR_ID 0x12D1
+#define QMI_GOBI_DEVICE(vend, prod) \
+ USB_DEVICE(vend, prod), \
+ .driver_info = (unsigned long)&qmi_wwan_gobi
+
+static const struct usb_device_id products[] = {
+ { /* Huawei E392, E398 and possibly others sharing both device id and more... */
+ .match_flags = USB_DEVICE_ID_MATCH_VENDOR | USB_DEVICE_ID_MATCH_INT_INFO,
+ .idVendor = HUAWEI_VENDOR_ID,
+ .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
+ .bInterfaceSubClass = 1,
+ .bInterfaceProtocol = 8, /* NOTE: This is the *slave* interface of the CDC Union! */
+ .driver_info = (unsigned long)&qmi_wwan_info,
+ },
+ { /* Huawei E392, E398 and possibly others in "Windows mode"
+ * using a combined control and data interface without any CDC
+ * functional descriptors
+ */
+ .match_flags = USB_DEVICE_ID_MATCH_VENDOR | USB_DEVICE_ID_MATCH_INT_INFO,
+ .idVendor = HUAWEI_VENDOR_ID,
+ .bInterfaceClass = USB_CLASS_VENDOR_SPEC,
+ .bInterfaceSubClass = 1,
+ .bInterfaceProtocol = 17,
+ .driver_info = (unsigned long)&qmi_wwan_shared,
+ },
+ { /* Pantech UML290 */
+ .match_flags = USB_DEVICE_ID_MATCH_DEVICE | USB_DEVICE_ID_MATCH_INT_INFO,
+ .idVendor = 0x106c,
+ .idProduct = 0x3718,
+ .bInterfaceClass = 0xff,
+ .bInterfaceSubClass = 0xf0,
+ .bInterfaceProtocol = 0xff,
+ .driver_info = (unsigned long)&qmi_wwan_shared,
+ },
+ {QMI_GOBI_DEVICE(0x05c6, 0x9212)}, /* Acer Gobi Modem Device */
+ {QMI_GOBI_DEVICE(0x03f0, 0x1f1d)}, /* HP un2400 Gobi Modem Device */
+ {QMI_GOBI_DEVICE(0x03f0, 0x371d)}, /* HP un2430 Mobile Broadband Module */
+ {QMI_GOBI_DEVICE(0x04da, 0x250d)}, /* Panasonic Gobi Modem device */
+ {QMI_GOBI_DEVICE(0x413c, 0x8172)}, /* Dell Gobi Modem device */
+ {QMI_GOBI_DEVICE(0x1410, 0xa001)}, /* Novatel Gobi Modem device */
+ {QMI_GOBI_DEVICE(0x0b05, 0x1776)}, /* Asus Gobi Modem device */
+ {QMI_GOBI_DEVICE(0x19d2, 0xfff3)}, /* ONDA Gobi Modem device */
+ {QMI_GOBI_DEVICE(0x05c6, 0x9001)}, /* Generic Gobi Modem device */
+ {QMI_GOBI_DEVICE(0x05c6, 0x9002)}, /* Generic Gobi Modem device */
+ {QMI_GOBI_DEVICE(0x05c6, 0x9202)}, /* Generic Gobi Modem device */
+ {QMI_GOBI_DEVICE(0x05c6, 0x9203)}, /* Generic Gobi Modem device */
+ {QMI_GOBI_DEVICE(0x05c6, 0x9222)}, /* Generic Gobi Modem device */
+ {QMI_GOBI_DEVICE(0x05c6, 0x9009)}, /* Generic Gobi Modem device */
+ {QMI_GOBI_DEVICE(0x413c, 0x8186)}, /* Dell Gobi 2000 Modem device (N0218, VU936) */
+ {QMI_GOBI_DEVICE(0x05c6, 0x920b)}, /* Generic Gobi 2000 Modem device */
+ {QMI_GOBI_DEVICE(0x05c6, 0x9225)}, /* Sony Gobi 2000 Modem device (N0279, VU730) */
+ {QMI_GOBI_DEVICE(0x05c6, 0x9245)}, /* Samsung Gobi 2000 Modem device (VL176) */
+ {QMI_GOBI_DEVICE(0x03f0, 0x251d)}, /* HP Gobi 2000 Modem device (VP412) */
+ {QMI_GOBI_DEVICE(0x05c6, 0x9215)}, /* Acer Gobi 2000 Modem device (VP413) */
+ {QMI_GOBI_DEVICE(0x05c6, 0x9265)}, /* Asus Gobi 2000 Modem device (VR305) */
+ {QMI_GOBI_DEVICE(0x05c6, 0x9235)}, /* Top Global Gobi 2000 Modem device (VR306) */
+ {QMI_GOBI_DEVICE(0x05c6, 0x9275)}, /* iRex Technologies Gobi 2000 Modem device (VR307) */
+ {QMI_GOBI_DEVICE(0x1199, 0x9001)}, /* Sierra Wireless Gobi 2000 Modem device (VT773) */
+ {QMI_GOBI_DEVICE(0x1199, 0x9002)}, /* Sierra Wireless Gobi 2000 Modem device (VT773) */
+ {QMI_GOBI_DEVICE(0x1199, 0x9003)}, /* Sierra Wireless Gobi 2000 Modem device (VT773) */
+ {QMI_GOBI_DEVICE(0x1199, 0x9004)}, /* Sierra Wireless Gobi 2000 Modem device (VT773) */
+ {QMI_GOBI_DEVICE(0x1199, 0x9005)}, /* Sierra Wireless Gobi 2000 Modem device (VT773) */
+ {QMI_GOBI_DEVICE(0x1199, 0x9006)}, /* Sierra Wireless Gobi 2000 Modem device (VT773) */
+ {QMI_GOBI_DEVICE(0x1199, 0x9007)}, /* Sierra Wireless Gobi 2000 Modem device (VT773) */
+ {QMI_GOBI_DEVICE(0x1199, 0x9008)}, /* Sierra Wireless Gobi 2000 Modem device (VT773) */
+ {QMI_GOBI_DEVICE(0x1199, 0x9009)}, /* Sierra Wireless Gobi 2000 Modem device (VT773) */
+ {QMI_GOBI_DEVICE(0x1199, 0x900a)}, /* Sierra Wireless Gobi 2000 Modem device (VT773) */
+ {QMI_GOBI_DEVICE(0x1199, 0x9011)}, /* Sierra Wireless Gobi 2000 Modem device (MC8305) */
+ {QMI_GOBI_DEVICE(0x16d8, 0x8002)}, /* CMDTech Gobi 2000 Modem device (VU922) */
+ {QMI_GOBI_DEVICE(0x05c6, 0x9205)}, /* Gobi 2000 Modem device */
+ {QMI_GOBI_DEVICE(0x1199, 0x9013)}, /* Sierra Wireless Gobi 3000 Modem device (MC8355) */
+ { } /* END */
+};
+MODULE_DEVICE_TABLE(usb, products);
+
+static struct usb_driver qmi_wwan_driver = {
+ .name = "qmi_wwan",
+ .id_table = products,
+ .probe = usbnet_probe,
+ .disconnect = usbnet_disconnect,
+ .suspend = qmi_wwan_suspend,
+ .resume = qmi_wwan_resume,
+ .reset_resume = qmi_wwan_resume,
+ .supports_autosuspend = 1,
+};
+
+static int __init qmi_wwan_init(void)
+{
+ return usb_register(&qmi_wwan_driver);
+}
+module_init(qmi_wwan_init);
+
+static void __exit qmi_wwan_exit(void)
+{
+ usb_deregister(&qmi_wwan_driver);
+}
+module_exit(qmi_wwan_exit);
+
+MODULE_AUTHOR("Bjørn Mork <bjorn@mork.no>");
+MODULE_DESCRIPTION("Qualcomm MSM Interface (QMI) WWAN driver");
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-12 03:23:43 +0000