From patchwork Tue May 11 14:42:22 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Loic Poulain X-Patchwork-Id: 434218 Delivered-To: patch@linaro.org Received: by 2002:a02:c901:0:0:0:0:0 with SMTP id t1csp3890635jao; Tue, 11 May 2021 07:33:30 -0700 (PDT) X-Google-Smtp-Source: ABdhPJwNjPjvq411AW1QeSz6kTQ6z9tXL3QhyuLjGTnu+gpd1MUByWHWXKsIgyqG2+9iDq+T1MZE X-Received: by 2002:a02:a388:: with SMTP id y8mr16726484jak.26.1620743609952; Tue, 11 May 2021 07:33:29 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1620743609; cv=none; d=google.com; s=arc-20160816; b=mHhHbRyMRZL/yZOs9J5RH2xzi482BHogv1BmEtejlNxVK5kqS9co7hGBN6U2xqch2X +MFb2cHet37nctmcvfneyNDb4H49k9iUUCWuGU1OUqxhg0EzBgjkUWle4DBVKOUj+VPh GXJNq0/c7OIRQosEVVK5KQcBjrbDw5lHQt4GSljBJb97qsI/JtGxOiLiLSUCjHW4Rfne Ua4eMMQaeVQkmDnuns5s5S4VpoNBdfAQrLLv8YqlS3Q6rm9xtp2plrZ1+5eomXMrwCh+ 4qOD2gWq3L5kXZF2D8YheKjzJEHQ0Za2xzNqxf5bm8I0ApIiYQbRxioOstdcLXE/GF+x bSig== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:message-id:date:subject:cc:to:from :dkim-signature; bh=/b8VYNRk0jePTJBarCozJxGSdSmdkQELnsloLn9GeSE=; b=BO7YbHppjutjBjx7p7apiW27XIwjTxMcwWIfdH1gVMTsP5rnzuYv7htOpVwSIhtcV4 vgJXEL6Dy6tY68MVlwXW4qkjBV+vpuVjx0kYHk9KaYYEDTGHl0+cawdsqzFZ1J7q8fQV uJuXW4uoSp22qsnOxIVv+JdPJe2AUbss+E0xaYxEIQItafl4Y+eMN9sBOCZFJKYHllx1 WWtVY6TiNiCWgMLwkMxmhIM1awqEVBwuz2x2mIEz2JYFAxPIA3bBFkVPTp/kHIZHQvSu r9/bMr3aDS6wU971IVl6gFRZrY3tFnX33Xi8JJGWeEeBJy4O4Nxl5QMIGvWNZKDMXKHQ TatA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=psfP3Hwf; spf=pass (google.com: domain of netdev-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=netdev-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id y20si12405263ioj.68.2021.05.11.07.33.29; Tue, 11 May 2021 07:33:29 -0700 (PDT) Received-SPF: pass (google.com: domain of netdev-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=psfP3Hwf; spf=pass (google.com: domain of netdev-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=netdev-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231797AbhEKOea (ORCPT + 8 others); Tue, 11 May 2021 10:34:30 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49756 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231590AbhEKOe2 (ORCPT ); Tue, 11 May 2021 10:34:28 -0400 Received: from mail-wr1-x42c.google.com (mail-wr1-x42c.google.com [IPv6:2a00:1450:4864:20::42c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A2B21C061574 for ; Tue, 11 May 2021 07:33:21 -0700 (PDT) Received: by mail-wr1-x42c.google.com with SMTP id v12so20359899wrq.6 for ; Tue, 11 May 2021 07:33:21 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id; bh=/b8VYNRk0jePTJBarCozJxGSdSmdkQELnsloLn9GeSE=; b=psfP3HwftSOIBsYQ46vIPksoAAbK9Myk0jsTygUyGMPodYSEEWoRkMcc5G+KaB+1Dy XXEwDWeTkP91szTYmbS7n0wUywAPcQb45Y/8MbqeULzT+roFM+aR2r/YKqb5f5YjBaUP WnqgTLa22cSIpRG6loC8DSKfCif8xBz2JpHuuTtqIroEOONX0LbG+ewFOjoG1W+Z9cy+ xJFCY5jUuuvjgbBqUEUxHjhOxKaLz977mElFxJ+QREzda8G8wYHFXZ1IHwbjqJ/cIuZm zpeOLs869SEaNoStI4+DMzZ97jZW8WsRW+XJA+ViyUgmfv0OfwR8svjX3NhzXApYts7i c0tg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=/b8VYNRk0jePTJBarCozJxGSdSmdkQELnsloLn9GeSE=; b=I9QS8uAkQkMfQGdGaSefNufWR9nWnDhc1yNt0M50HMfJAAO4WXXKAAFd2d3eH1xITJ GHQz/CHa5gI/D1ZseeIKqKpLOUfRxGlC5XX5cHxoL9OVxUmnd+xKjdmVnp3M65VbBvYo ySreqXbFZmaOS23jN0fZhgGiNCctjrJqUMhdbZoVoBaQcUttrYJy4Uf9MGd56mYS8/W7 W39OOVWaSiXMS3ZEEesKwiAA7zUXfKWyjJdp4c7LUUX9iWqdDd7UzoXikT+g81kMw/CB pdxXprtL9DTOI6FFJUE5+GFtYgoUlFOOuN5Wgp5Wwb3pc8E7vNzVZVYwvcBXbllGJq+W V/Fg== X-Gm-Message-State: AOAM530gZptwNBHKA79Ktf5pHtOYq6qgVn0S241HjJL8cRTn5EO3NA8r byN0YnkjdoJuGj6BUZJsrB+XxA== X-Received: by 2002:adf:ef92:: with SMTP id d18mr39377147wro.413.1620743600319; Tue, 11 May 2021 07:33:20 -0700 (PDT) Received: from localhost.localdomain ([2a01:e0a:82c:5f0:ddef:1d66:be88:86cc]) by smtp.gmail.com with ESMTPSA id j13sm27773018wrw.93.2021.05.11.07.33.19 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Tue, 11 May 2021 07:33:19 -0700 (PDT) From: Loic Poulain To: oliver@neukum.org Cc: kuba@kernel.org, davem@davemloft.net, bjorn@mork.no, netdev@vger.kernel.org, aleksander@aleksander.es, Loic Poulain Subject: [PATCH net-next v2 1/2] net: wwan: Add unknown port type Date: Tue, 11 May 2021 16:42:22 +0200 Message-Id: <1620744143-26075-1-git-send-email-loic.poulain@linaro.org> X-Mailer: git-send-email 2.7.4 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Some devices may have ports with unknown type/protocol which need to be tagged (though not supported by WWAN core). This will be the case for cdc-wdm based drivers. Signed-off-by: Loic Poulain --- v2: Replace CDC specific port types change with that change include/linux/wwan.h | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) -- 2.7.4 diff --git a/include/linux/wwan.h b/include/linux/wwan.h index aa05a25..7216c11 100644 --- a/include/linux/wwan.h +++ b/include/linux/wwan.h @@ -15,6 +15,7 @@ * @WWAN_PORT_QMI: Qcom modem/MSM interface for modem control * @WWAN_PORT_QCDM: Qcom Modem diagnostic interface * @WWAN_PORT_FIREHOSE: XML based command protocol + * @WWAN_PORT_UNKNOWN: Unknown port type * @WWAN_PORT_MAX: Number of supported port types */ enum wwan_port_type { @@ -23,7 +24,8 @@ enum wwan_port_type { WWAN_PORT_QMI, WWAN_PORT_QCDM, WWAN_PORT_FIREHOSE, - WWAN_PORT_MAX, + WWAN_PORT_UNKNOWN, + WWAN_PORT_MAX = WWAN_PORT_UNKNOWN, }; struct wwan_port; From patchwork Tue May 11 14:42:23 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Loic Poulain X-Patchwork-Id: 434219 Delivered-To: patch@linaro.org Received: by 2002:a02:c901:0:0:0:0:0 with SMTP id t1csp3890643jao; Tue, 11 May 2021 07:33:30 -0700 (PDT) X-Google-Smtp-Source: ABdhPJxc5HbYkXzPD6Zk6DO9FTDZ6Q1a5vGjbAY1R41v4HMM2EITybLOxa/kwhWJWxfFfZffV1ID X-Received: by 2002:a05:6602:280d:: with SMTP id d13mr15445275ioe.90.1620743610333; Tue, 11 May 2021 07:33:30 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1620743610; cv=none; d=google.com; s=arc-20160816; b=q6LLUdE+sR0XenRKxEExXBpHzqUMg2YnJrvMs/nAzM130oBGQ52tng7mX8DMDBQnYk llE6Vb2gmYCqAiJ0xdDsKES/pc08UcGvbYeFBfRC4MxWUu3o+AT8+CT+nhyHggm3yvJt SE2fnjFi2Ox6wJtucrtexfK7vCH1JQreB7I6SK1BKgykU66hx/jT2TGP8FNxJREv3xKE lUSVExhGNCRND4cx6S0GIpXED9cXAgqobhU0djzx3YjS4IAUuuPLMrAY/l0xN2w0lJuQ L4IdsYTVO8Sq1oBGti5m6CYkpPQ4mCLiZ39qnApEo54f4t3Q9FM3Y+jhuXXo06BJgx4j 8nJQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:references:in-reply-to:message-id:date:subject :cc:to:from:dkim-signature; bh=Zezgoqt0zCsoq+uBC0Vp75VtG0oU7/1H5gH0gmp1xrI=; b=DyfPtePc5nMJM3lcvlqOIIm+Cp1URVe5qX1pD7Ru4BGMV5oiy8ObDDLVgT5KHDIVZD AAocVePLzY5HXEIwU7i2FtVDkoNvmL8FtREMTELtp4DPEPfAhzpSk61vtmEBJ7abQq4t puLZvLdorUhI4pHxZv8onoETrGjpAnNwSXb51WpZSKGfP6OWFdM1bh34EexamR26P+GJ yS9uZGgQ5BjvVMUwZ4M2U8kG6AATWgwUZ8bH1rVCzg5GeLp5Qa7S8yEpbfQ88WT7JkCO xwb1cUndlnWxevxjori3dp+Wuu3B2HLg3dASyA7JpH2S+eVSHJt1sj3qqGu8OVcKaVhn Xe1w== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=kGpUCDEo; spf=pass (google.com: domain of netdev-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=netdev-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id y20si12405263ioj.68.2021.05.11.07.33.30; Tue, 11 May 2021 07:33:30 -0700 (PDT) Received-SPF: pass (google.com: domain of netdev-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=kGpUCDEo; spf=pass (google.com: domain of netdev-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=netdev-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231809AbhEKOec (ORCPT + 8 others); Tue, 11 May 2021 10:34:32 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49766 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231760AbhEKOea (ORCPT ); Tue, 11 May 2021 10:34:30 -0400 Received: from mail-wm1-x334.google.com (mail-wm1-x334.google.com [IPv6:2a00:1450:4864:20::334]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2C9C2C061574 for ; Tue, 11 May 2021 07:33:23 -0700 (PDT) Received: by mail-wm1-x334.google.com with SMTP id b11-20020a7bc24b0000b0290148da0694ffso1346150wmj.2 for ; Tue, 11 May 2021 07:33:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=Zezgoqt0zCsoq+uBC0Vp75VtG0oU7/1H5gH0gmp1xrI=; b=kGpUCDEonFPeib3U7RBkBi/ayMuh/zQVldHg9RW6dlTSShPXtZ+ZwU7mv8PwxalWHe TPKxCEpnvoiXJKLy/vKNwF7BFl87Ta700kSKBRz6Dx3S6h62GkvW4VTolncDScZPNyGC 8JBRjUPOXEbiVcaF4YD/xfp3YSseaAVbsjj07dRex8t15EzOnOQPbC4j4z5Aa8yPt5uz P1uJD4NWhuJSGolNseWMSSmCb+G7w1vgQ1wfS+Cu2m9o0yb4gSGsIsH5hzCoprb53z0c smXqU3NfUj/AlK9aT0AKRKRbUP7GWiZJYwNNpY5Cl4NGx5w7gBdhn/pA6XBCQyyq9JCj +Z2w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=Zezgoqt0zCsoq+uBC0Vp75VtG0oU7/1H5gH0gmp1xrI=; b=QZfv0gO/K6G52UwynwiDrDrmdobaQZZr73FZ3BQcAb5cOzvgatKt1YDi0kr7Utm27A k3sTAAt8dSErv8sclxpym8/OI0qViDbvEGHGQUgQzxKR/osLLeMDfGdnSw7tjWCKn217 OhLPPIzAzzwfNzbxCbtIZRQ/BVM5VScwR/v1ox7lcNhBzImLXIwvlPdU3ipFfV2u7Hpl oKCjz5s/QDlV/IeOGz3mT1HPDicjQyD5nQqKtz8IrPWYO7vQzNsLPJhlEjcY5hojcLiF nLE3JdUIR1Asr0ZZVp9KFudjRh4dGPMPcPMAXXXXd5ARwXXtpTCJi0B4Rxt1EIlw7gNm jxBQ== X-Gm-Message-State: AOAM530sKjfO5HOXTMzZ52Ta+phtjTUKCuypOIiPdFXv8IzcF/aSfI4P Kdo1EBaO1oIKN5GleEp6mGVVuw== X-Received: by 2002:a1c:7f4a:: with SMTP id a71mr5774948wmd.60.1620743601231; Tue, 11 May 2021 07:33:21 -0700 (PDT) Received: from localhost.localdomain ([2a01:e0a:82c:5f0:ddef:1d66:be88:86cc]) by smtp.gmail.com with ESMTPSA id j13sm27773018wrw.93.2021.05.11.07.33.20 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Tue, 11 May 2021 07:33:20 -0700 (PDT) From: Loic Poulain To: oliver@neukum.org Cc: kuba@kernel.org, davem@davemloft.net, bjorn@mork.no, netdev@vger.kernel.org, aleksander@aleksander.es, Loic Poulain Subject: [PATCH net-next v2 2/2] usb: class: cdc-wdm: WWAN framework integration Date: Tue, 11 May 2021 16:42:23 +0200 Message-Id: <1620744143-26075-2-git-send-email-loic.poulain@linaro.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1620744143-26075-1-git-send-email-loic.poulain@linaro.org> References: <1620744143-26075-1-git-send-email-loic.poulain@linaro.org> Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org The WWAN framework provides a unified way to handle WWAN/modems and its control port(s). It has initially been introduced to support MHI/PCI modems, offering the same control protocols as the USB variants such as MBIM, QMI, AT... The WWAN framework exposes these control protocols as character devices, similarly to cdc-wdm, but in a bus agnostic fashion. This change adds registration of the USB modem cdc-wdm control endpoints to the WWAN framework as standard control ports (wwanXpY...). Exposing cdc-wdm through WWAN framework normally maintains backward compatibility, e.g: $ qmicli --device-open-qmi -d /dev/wwan0p1QMI --dms-get-ids instead of $ qmicli --device-open-qmi -d /dev/cdc-wdm0 --dms-get-ids However, some tools may rely on cdc-wdm driver/device name for device detection. It is then safer to keep the 'legacy' cdc-wdm character device to prevent any breakage. This is handled in this change by API mutual exclusion, only one access method can be used at a time, either cdc-wdm chardev or WWAN API. Note that unknown channel types (other than MBIM, AT or MBIM) are not registered to the WWAN framework. Signed-off-by: Loic Poulain --- v2: - Fix pm runtime while ongoing transmission - Use WWAN port type instead of CDC specific ones - Change port_start ordering - Handle usb_submit_urb return value - Fix build issue reported by kernel-test-rebot drivers/net/usb/cdc_mbim.c | 1 + drivers/net/usb/huawei_cdc_ncm.c | 1 + drivers/net/usb/qmi_wwan.c | 3 +- drivers/usb/class/cdc-wdm.c | 180 ++++++++++++++++++++++++++++++++++++++- include/linux/usb/cdc-wdm.h | 3 +- 5 files changed, 182 insertions(+), 6 deletions(-) -- 2.7.4 diff --git a/drivers/net/usb/cdc_mbim.c b/drivers/net/usb/cdc_mbim.c index 5db6627..42fb750 100644 --- a/drivers/net/usb/cdc_mbim.c +++ b/drivers/net/usb/cdc_mbim.c @@ -168,6 +168,7 @@ static int cdc_mbim_bind(struct usbnet *dev, struct usb_interface *intf) subdriver = usb_cdc_wdm_register(ctx->control, &dev->status->desc, le16_to_cpu(ctx->mbim_desc->wMaxControlMessage), + WWAN_PORT_MBIM, cdc_mbim_wdm_manage_power); if (IS_ERR(subdriver)) { ret = PTR_ERR(subdriver); diff --git a/drivers/net/usb/huawei_cdc_ncm.c b/drivers/net/usb/huawei_cdc_ncm.c index a87f0da..849b773 100644 --- a/drivers/net/usb/huawei_cdc_ncm.c +++ b/drivers/net/usb/huawei_cdc_ncm.c @@ -96,6 +96,7 @@ static int huawei_cdc_ncm_bind(struct usbnet *usbnet_dev, subdriver = usb_cdc_wdm_register(ctx->control, &usbnet_dev->status->desc, 1024, /* wMaxCommand */ + WWAN_PORT_AT, huawei_cdc_ncm_wdm_manage_power); if (IS_ERR(subdriver)) { ret = PTR_ERR(subdriver); diff --git a/drivers/net/usb/qmi_wwan.c b/drivers/net/usb/qmi_wwan.c index 17a0505..11c898f 100644 --- a/drivers/net/usb/qmi_wwan.c +++ b/drivers/net/usb/qmi_wwan.c @@ -724,7 +724,8 @@ static int qmi_wwan_register_subdriver(struct usbnet *dev) /* register subdriver */ subdriver = usb_cdc_wdm_register(info->control, &dev->status->desc, - 4096, &qmi_wwan_cdc_wdm_manage_power); + 4096, WWAN_PORT_QMI, + &qmi_wwan_cdc_wdm_manage_power); if (IS_ERR(subdriver)) { dev_err(&info->control->dev, "subdriver registration failed\n"); rv = PTR_ERR(subdriver); diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c index 508b1c3..457b00c 100644 --- a/drivers/usb/class/cdc-wdm.c +++ b/drivers/usb/class/cdc-wdm.c @@ -21,8 +21,10 @@ #include #include #include +#include #include #include +#include #include #include #include @@ -55,6 +57,7 @@ MODULE_DEVICE_TABLE (usb, wdm_ids); #define WDM_SUSPENDING 8 #define WDM_RESETTING 9 #define WDM_OVERFLOW 10 +#define WDM_WWAN_IN_USE 11 #define WDM_MAX 16 @@ -106,6 +109,9 @@ struct wdm_device { struct list_head device_list; int (*manage_power)(struct usb_interface *, int); + + enum wwan_port_type wwanp_type; + struct wwan_port *wwanp; }; static struct usb_driver wdm_driver; @@ -157,6 +163,8 @@ static void wdm_out_callback(struct urb *urb) wake_up_all(&desc->wait); } +static void wdm_wwan_rx(struct wdm_device *desc, int length); + static void wdm_in_callback(struct urb *urb) { unsigned long flags; @@ -192,6 +200,11 @@ static void wdm_in_callback(struct urb *urb) } } + if (test_bit(WDM_WWAN_IN_USE, &desc->flags)) { + wdm_wwan_rx(desc, length); + goto out; + } + /* * only set a new error if there is no previous error. * Errors are only cleared during read/open @@ -226,6 +239,7 @@ static void wdm_in_callback(struct urb *urb) set_bit(WDM_READ, &desc->flags); wake_up(&desc->wait); } +out: spin_unlock_irqrestore(&desc->iuspin, flags); } @@ -697,6 +711,11 @@ static int wdm_open(struct inode *inode, struct file *file) goto out; file->private_data = desc; + if (test_bit(WDM_WWAN_IN_USE, &desc->flags)) { + rv = -EBUSY; + goto out; + } + rv = usb_autopm_get_interface(desc->intf); if (rv < 0) { dev_err(&desc->intf->dev, "Error autopm - %d\n", rv); @@ -792,6 +811,151 @@ static struct usb_class_driver wdm_class = { .minor_base = WDM_MINOR_BASE, }; +/* --- WWAN framework integration --- */ +#ifdef CONFIG_WWAN +static int wdm_wwan_port_start(struct wwan_port *port) +{ + struct wdm_device *desc = wwan_port_get_drvdata(port); + + /* The interface is both exposed via the WWAN framework and as a + * legacy usbmisc chardev. If chardev is already open, just fail + * to prevent concurrent usage. Otherwise, switch to WWAN mode. + */ + mutex_lock(&wdm_mutex); + if (desc->count) { + mutex_unlock(&wdm_mutex); + return -EBUSY; + } + set_bit(WDM_WWAN_IN_USE, &desc->flags); + mutex_unlock(&wdm_mutex); + + desc->manage_power(desc->intf, 1); + + /* tx is allowed */ + wwan_port_txon(port); + + /* Start getting events */ + return usb_submit_urb(desc->validity, GFP_KERNEL); +} + +static void wdm_wwan_port_stop(struct wwan_port *port) +{ + struct wdm_device *desc = wwan_port_get_drvdata(port); + + /* Stop all transfers and disable WWAN mode */ + kill_urbs(desc); + desc->manage_power(desc->intf, 0); + clear_bit(WDM_READ, &desc->flags); + clear_bit(WDM_WWAN_IN_USE, &desc->flags); +} + +static void wdm_wwan_port_tx_complete(struct urb *urb) +{ + struct sk_buff *skb = urb->context; + struct wdm_device *desc = skb_shinfo(skb)->destructor_arg; + + usb_autopm_put_interface(desc->intf); + wwan_port_txon(desc->wwanp); + kfree_skb(skb); +} + +static int wdm_wwan_port_tx(struct wwan_port *port, struct sk_buff *skb) +{ + struct wdm_device *desc = wwan_port_get_drvdata(port); + struct usb_interface *intf = desc->intf; + struct usb_ctrlrequest *req = desc->orq; + int rv; + + rv = usb_autopm_get_interface(intf); + if (rv) + return rv; + + usb_fill_control_urb( + desc->command, + interface_to_usbdev(intf), + usb_sndctrlpipe(interface_to_usbdev(intf), 0), + (unsigned char *)req, + skb->data, + skb->len, + wdm_wwan_port_tx_complete, + skb + ); + + req->bRequestType = (USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE); + req->bRequest = USB_CDC_SEND_ENCAPSULATED_COMMAND; + req->wValue = 0; + req->wIndex = desc->inum; + req->wLength = cpu_to_le16(skb->len); + + skb_shinfo(skb)->destructor_arg = desc; + + rv = usb_submit_urb(desc->command, GFP_KERNEL); + if (rv) + usb_autopm_put_interface(intf); + else /* One transfer at a time, stop TX until URB completion */ + wwan_port_txoff(port); + + return rv; +} + +static struct wwan_port_ops wdm_wwan_port_ops = { + .start = wdm_wwan_port_start, + .stop = wdm_wwan_port_stop, + .tx = wdm_wwan_port_tx, +}; + +static void wdm_wwan_init(struct wdm_device *desc) +{ + struct usb_interface *intf = desc->intf; + struct wwan_port *port; + + /* Only register to WWAN core if protocol/type is known */ + if (desc->wwanp_type == WWAN_PORT_UNKNOWN) { + dev_info(&intf->dev, "Unknown control protocol\n"); + return; + } + + port = wwan_create_port(&intf->dev, desc->wwanp_type, &wdm_wwan_port_ops, desc); + if (IS_ERR(port)) { + dev_err(&intf->dev, "%s: Unable to create WWAN port\n", + dev_name(intf->usb_dev)); + return; + } + + desc->wwanp = port; +} + +static void wdm_wwan_deinit(struct wdm_device *desc) +{ + if (!desc->wwanp) + return; + + wwan_remove_port(desc->wwanp); + desc->wwanp = NULL; +} + +static void wdm_wwan_rx(struct wdm_device *desc, int length) +{ + struct wwan_port *port = desc->wwanp; + struct sk_buff *skb; + + /* Forward data to WWAN port */ + skb = alloc_skb(length, GFP_ATOMIC); + if (!skb) + return; + + memcpy(skb_put(skb, length), desc->inbuf, length); + wwan_port_rx(port, skb); + + /* inbuf has been copied, it is safe to check for outstanding data */ + schedule_work(&desc->service_outs_intr); +} +#else /* CONFIG_WWAN */ +static void wdm_wwan_init(struct wdm_device *desc) {} +static void wdm_wwan_deinit(struct wdm_device *desc) {} +static void wdm_wwan_rx(struct wdm_device *desc, int length) {} +#endif /* CONFIG_WWAN */ + /* --- error handling --- */ static void wdm_rxwork(struct work_struct *work) { @@ -836,7 +1000,8 @@ static void service_interrupt_work(struct work_struct *work) /* --- hotplug --- */ static int wdm_create(struct usb_interface *intf, struct usb_endpoint_descriptor *ep, - u16 bufsize, int (*manage_power)(struct usb_interface *, int)) + u16 bufsize, enum wwan_port_type type, + int (*manage_power)(struct usb_interface *, int)) { int rv = -ENOMEM; struct wdm_device *desc; @@ -853,6 +1018,7 @@ static int wdm_create(struct usb_interface *intf, struct usb_endpoint_descriptor /* this will be expanded and needed in hardware endianness */ desc->inum = cpu_to_le16((u16)intf->cur_altsetting->desc.bInterfaceNumber); desc->intf = intf; + desc->wwanp_type = type; INIT_WORK(&desc->rxwork, wdm_rxwork); INIT_WORK(&desc->service_outs_intr, service_interrupt_work); @@ -933,6 +1099,9 @@ static int wdm_create(struct usb_interface *intf, struct usb_endpoint_descriptor goto err; else dev_info(&intf->dev, "%s: USB WDM device\n", dev_name(intf->usb_dev)); + + wdm_wwan_init(desc); + out: return rv; err: @@ -977,7 +1146,7 @@ static int wdm_probe(struct usb_interface *intf, const struct usb_device_id *id) goto err; ep = &iface->endpoint[0].desc; - rv = wdm_create(intf, ep, maxcom, &wdm_manage_power); + rv = wdm_create(intf, ep, maxcom, WWAN_PORT_UNKNOWN, &wdm_manage_power); err: return rv; @@ -988,6 +1157,7 @@ static int wdm_probe(struct usb_interface *intf, const struct usb_device_id *id) * @intf: usb interface the subdriver will associate with * @ep: interrupt endpoint to monitor for notifications * @bufsize: maximum message size to support for read/write + * @type: Type/protocol of the transported data (MBIM, QMI...) * @manage_power: call-back invoked during open and release to * manage the device's power * Create WDM usb class character device and associate it with intf @@ -1005,12 +1175,12 @@ static int wdm_probe(struct usb_interface *intf, const struct usb_device_id *id) */ struct usb_driver *usb_cdc_wdm_register(struct usb_interface *intf, struct usb_endpoint_descriptor *ep, - int bufsize, + int bufsize, enum wwan_port_type type, int (*manage_power)(struct usb_interface *, int)) { int rv; - rv = wdm_create(intf, ep, bufsize, manage_power); + rv = wdm_create(intf, ep, bufsize, type, manage_power); if (rv < 0) goto err; @@ -1029,6 +1199,8 @@ static void wdm_disconnect(struct usb_interface *intf) desc = wdm_find_device(intf); mutex_lock(&wdm_mutex); + wdm_wwan_deinit(desc); + /* the spinlock makes sure no new urbs are generated in the callbacks */ spin_lock_irqsave(&desc->iuspin, flags); set_bit(WDM_DISCONNECTING, &desc->flags); diff --git a/include/linux/usb/cdc-wdm.h b/include/linux/usb/cdc-wdm.h index 9b895f9..9f5a51f 100644 --- a/include/linux/usb/cdc-wdm.h +++ b/include/linux/usb/cdc-wdm.h @@ -12,11 +12,12 @@ #ifndef __LINUX_USB_CDC_WDM_H #define __LINUX_USB_CDC_WDM_H +#include #include extern struct usb_driver *usb_cdc_wdm_register(struct usb_interface *intf, struct usb_endpoint_descriptor *ep, - int bufsize, + int bufsize, enum wwan_port_type type, int (*manage_power)(struct usb_interface *, int)); #endif /* __LINUX_USB_CDC_WDM_H */