From mboxrd@z Thu Jan 1 00:00:00 1970 From: Enrico Mioso Subject: [PATCH] net: huawei_cdc_ncm: Introduce new huawei_cdc_ncm driver Date: Fri, 16 Aug 2013 15:44:07 +0200 (CEST) Message-ID: References: <87wqp9xja5.fsf@nemi.mork.no> <0cbf7c81-182e-493c-9c28-5b78160a08f1@email.android.com> <87bo4xx3ef.fsf@nemi.mork.no> Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Cc: Greg Kroah-Hartman , linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, netdev@vger.kernel.org To: =?ISO-8859-15?Q?Bj=F8rn_Mork?= Return-path: In-Reply-To: <87bo4xx3ef.fsf@nemi.mork.no> Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org This driver supports devices using the NCM protocol as an encapsulation layer for other protocols, like the E3131 Huawei 3G modem. Suggested-by: Bjorn Mork Signed-off-by: Enrico Mioso --- drivers/net/usb/Kconfig | 11 ++ drivers/net/usb/Makefile | 1 + drivers/net/usb/huawei_cdc_ncm.c | 210 ++++++++++++++++++++++++++++++++++++++ 3 files changed, 222 insertions(+) create mode 100644 drivers/net/usb/huawei_cdc_ncm.c diff --git a/drivers/net/usb/Kconfig b/drivers/net/usb/Kconfig index d84bfd4..6e56751 100644 --- a/drivers/net/usb/Kconfig +++ b/drivers/net/usb/Kconfig @@ -242,6 +242,17 @@ config USB_NET_CDC_NCM * ST-Ericsson M343 HSPA Mobile Broadband Modem (reference design) * Ericsson F5521gw Mobile Broadband Module +config USB_NET_HUAWEI_CDC_NCM + tristate "Huawei-style CDC NCM support" + depends on USB_USBNET + select USB_WDM + select USB_NET_CDC_NCM + help + This driver aims to support huawei-style NCM devices, that use ncm as a + transport for other protocols. + To compile this driver as a module, choose M here: the module will be + called huawei_cdc_ncm. + config USB_NET_CDC_MBIM tristate "CDC MBIM support" depends on USB_USBNET diff --git a/drivers/net/usb/Makefile b/drivers/net/usb/Makefile index e817178..fd0e6a7 100644 --- a/drivers/net/usb/Makefile +++ b/drivers/net/usb/Makefile @@ -31,6 +31,7 @@ obj-$(CONFIG_USB_IPHETH) += ipheth.o obj-$(CONFIG_USB_SIERRA_NET) += sierra_net.o obj-$(CONFIG_USB_NET_CX82310_ETH) += cx82310_eth.o obj-$(CONFIG_USB_NET_CDC_NCM) += cdc_ncm.o +obj-$(CONFIG_USB_NET_HUAWEI_CDC_NCM) += huawei_cdc_ncm.o obj-$(CONFIG_USB_VL600) += lg-vl600.o obj-$(CONFIG_USB_NET_QMI_WWAN) += qmi_wwan.o obj-$(CONFIG_USB_NET_CDC_MBIM) += cdc_mbim.o diff --git a/drivers/net/usb/huawei_cdc_ncm.c b/drivers/net/usb/huawei_cdc_ncm.c new file mode 100644 index 0000000..d3426b9 --- /dev/null +++ b/drivers/net/usb/huawei_cdc_ncm.c @@ -0,0 +1,210 @@ +/* + * huawei_cdc_ncm.c - handles huawei-style NCM devices. + * Copyright (C) 2013 Enrico Mioso + * This driver handles devices resembling the CDC NCM standard, but + * encapsulating another protocol inside it. An example are some Huawei 3G + * devices, exposing an embedded AT channel where you can set up the NCM + * connection. + * This code has been heavily inspired by the cdc_mbim.c driver, which is + * Copyright (c) 2012 Smith Micro Software, Inc. + * Copyright (c) 2012 Bj??rn Mork + * + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* Driver data */ +struct huawei_cdc_ncm_state { + struct cdc_ncm_ctx *ctx; + atomic_t pmcount; + struct usb_driver *subdriver; + struct usb_interface *control; + struct usb_interface *data; +}; + +static int huawei_cdc_ncm_manage_power(struct usbnet *usbnet_dev, int on) +{ + struct huawei_cdc_ncm_state *drvstate = (void *)&usbnet_dev->data; + int rv = 0; + + if ((on && atomic_add_return(1, &drvstate->pmcount) == 1) || (!on && atomic_dec_and_test(&drvstate->pmcount))) { + rv = usb_autopm_get_interface(usbnet_dev->intf); + if (rv < 0) + goto err; + usbnet_dev->intf->needs_remote_wakeup = on; + usb_autopm_put_interface(usbnet_dev->intf); + } +err: + return rv; +} + +static int huawei_cdc_ncm_wdm_manage_power(struct usb_interface *intf, int status) +{ + struct usbnet *usbnet_dev = usb_get_intfdata(intf); + + /* can be called while disconnecting */ + if (!usbnet_dev) + return 0; + + return huawei_cdc_ncm_manage_power(usbnet_dev, status); +} + + +static int huawei_cdc_ncm_bind(struct usbnet *usbnet_dev, struct usb_interface *intf) +{ + struct cdc_ncm_ctx *ctx; + struct usb_driver *subdriver = ERR_PTR(-ENODEV); + int ret = -ENODEV; + struct huawei_cdc_ncm_state *drvstate = (void *)&usbnet_dev->data; + + ret = cdc_ncm_bind_common(usbnet_dev, intf, 1); /* altsetting should be 1 for NCM devices */ + if (ret) + goto err; + + ctx = drvstate->ctx; + + if (usbnet_dev->status) + subdriver = usb_cdc_wdm_register(ctx->control, + &usbnet_dev->status->desc, + 256, /* CDC-WMC r1.1 requires wMaxCommand to be "at least 256 decimal (0x100)" */ + huawei_cdc_ncm_wdm_manage_power); + if (IS_ERR(subdriver)) { + ret = PTR_ERR(subdriver); + cdc_ncm_unbind(usbnet_dev, intf); + goto err; + } + + /* Prevent usbnet from using the status descriptor */ + usbnet_dev->status = NULL; + + drvstate->subdriver = subdriver; + +err: + return ret; +} + +static void huawei_cdc_ncm_unbind(struct usbnet *usbnet_dev, struct usb_interface *intf) +{ + struct huawei_cdc_ncm_state *drvstate = (void *)&usbnet_dev->data; + struct cdc_ncm_ctx *ctx = drvstate->ctx; + + if (drvstate->subdriver && drvstate->subdriver->disconnect) + drvstate->subdriver->disconnect(ctx->control); + drvstate->subdriver = NULL; + + cdc_ncm_unbind(usbnet_dev, intf); +} + +static int huawei_cdc_ncm_suspend(struct usb_interface *intf, pm_message_t message) +{ + int ret = 0; + struct usbnet *usbnet_dev = usb_get_intfdata(intf); + struct huawei_cdc_ncm_state *drvstate = (void *)&usbnet_dev->data; + struct cdc_ncm_ctx *ctx = drvstate->ctx; + + if (ctx == NULL) { + ret = -1; + goto error; + } + + ret = usbnet_suspend(intf, message); + if (ret < 0) + goto error; + + if (intf == ctx->control && drvstate->subdriver && drvstate->subdriver->suspend) + ret = drvstate->subdriver->suspend(intf, message); + if (ret < 0) + usbnet_resume(intf); + +error: + return ret; +} + +static int huawei_cdc_ncm_resume(struct usb_interface *intf) +{ + int ret = 0; + struct usbnet *usbnet_dev = usb_get_intfdata(intf); + struct huawei_cdc_ncm_state *drvstate = (void *)&usbnet_dev->data; + struct cdc_ncm_ctx *ctx = drvstate->ctx; + bool callsub = (intf == ctx->control && drvstate->subdriver && drvstate->subdriver->resume); /* should we call subdriver's resume? ? */ + + if (callsub) + ret = drvstate->subdriver->resume(intf); + if (ret < 0) + goto err; + ret = usbnet_resume(intf); + if (ret < 0 && callsub && drvstate->subdriver->suspend) + drvstate->subdriver->suspend(intf, PMSG_SUSPEND); +err: + return ret; +} + +static int huawei_cdc_ncm_check_connect(struct usbnet *usbnet_dev) +{ + struct cdc_ncm_ctx *ctx; + + ctx = (struct cdc_ncm_ctx *)usbnet_dev->data[0]; + + if (ctx == NULL) + return 1; /* disconnected */ + + return !ctx->connected; +} + +static const struct driver_info huawei_cdc_ncm_info = { + .description = "Huawei CDC NCM device", + .flags = FLAG_NO_SETINT | FLAG_MULTI_PACKET | FLAG_WWAN, + .bind = huawei_cdc_ncm_bind, + .unbind = huawei_cdc_ncm_unbind, + .check_connect = huawei_cdc_ncm_check_connect, + .manage_power = huawei_cdc_ncm_manage_power, + .rx_fixup = cdc_ncm_rx_fixup, + .tx_fixup = cdc_ncm_tx_fixup, +}; + +static const struct usb_device_id huawei_cdc_ncm_devs[] = { + /* Huawei NCM devices disguised as vendor specific */ + { USB_VENDOR_AND_INTERFACE_INFO(0x12d1, 0xff, 0x02, 0x16), + .driver_info = (unsigned long)&huawei_cdc_ncm_info, + }, + { USB_VENDOR_AND_INTERFACE_INFO(0x12d1, 0xff, 0x02, 0x46), + .driver_info = (unsigned long)&huawei_cdc_ncm_info, + }, + { USB_VENDOR_AND_INTERFACE_INFO(0x12d1, 0xff, 0x02, 0x76), + .driver_info = (unsigned long)&huawei_cdc_ncm_info, + }, + + /* Terminating entry */ + { + }, +}; +MODULE_DEVICE_TABLE(usb, huawei_cdc_ncm_devs); + +static struct usb_driver huawei_cdc_ncm_driver = { + .name = "huawei_cdc_ncm", + .id_table = huawei_cdc_ncm_devs, + .probe = usbnet_probe, + .disconnect = usbnet_disconnect, + .suspend = huawei_cdc_ncm_suspend, + .resume = huawei_cdc_ncm_resume, + .reset_resume = huawei_cdc_ncm_resume, + .supports_autosuspend = 1, + .disable_hub_initiated_lpm = 1, +}; +module_usb_driver(huawei_cdc_ncm_driver); +MODULE_AUTHOR("Enrico Mioso "); +MODULE_DESCRIPTION("USB CDC NCM host driver with encapsulated protocol support"); +MODULE_LICENSE("GPL");