From patchwork Tue Aug 2 19:18:37 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Elson Roy Serrao X-Patchwork-Id: 595496 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 34120C00140 for ; Tue, 2 Aug 2022 19:18:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232269AbiHBTSr (ORCPT ); Tue, 2 Aug 2022 15:18:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44954 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231539AbiHBTSq (ORCPT ); Tue, 2 Aug 2022 15:18:46 -0400 Received: from alexa-out.qualcomm.com (alexa-out.qualcomm.com [129.46.98.28]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9B4D013D15; Tue, 2 Aug 2022 12:18:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; i=@quicinc.com; q=dns/txt; s=qcdkim; t=1659467924; x=1691003924; h=from:to:cc:subject:date:message-id:in-reply-to: references; bh=CEiM39jmsZQ3Q7QvJYvHTnmSseG/w2PJb9/iJQV5ItM=; b=G1ooD7130QDJFtdZYQq/aPlorsLy4QiBCYbVdDQ6R/OTO7KgFIbrn3Kc nCWfw1xy6UY+nEXNQYqGPFS3+oERqkQPGDds3oJvRfciMNg4AfCWhF2x4 abjSuDBlgk5NUhDT/gYdqhTVm6RMKQIKfCfTZbAZEfMYjFp8kLwCSLxDT k=; Received: from ironmsg09-lv.qualcomm.com ([10.47.202.153]) by alexa-out.qualcomm.com with ESMTP; 02 Aug 2022 12:18:42 -0700 X-QCInternal: smtphost Received: from hu-eserrao-lv.qualcomm.com (HELO hu-devc-lv-c.qualcomm.com) ([10.47.235.164]) by ironmsg09-lv.qualcomm.com with ESMTP; 02 Aug 2022 12:18:42 -0700 Received: by hu-devc-lv-c.qualcomm.com (Postfix, from userid 464172) id 75857211B4; Tue, 2 Aug 2022 12:18:42 -0700 (PDT) From: Elson Roy Serrao To: balbi@kernel.org, gregkh@linuxfoundation.org Cc: linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, quic_wcheng@quicinc.com, quic_jackp@quicinc.com, quic_mrana@quicinc.com, Thinh.Nguyen@synopsys.com, Elson Roy Serrao Subject: [PATCH 2/5] usb: gadget: Add function wakeup support Date: Tue, 2 Aug 2022 12:18:37 -0700 Message-Id: <1659467920-9095-3-git-send-email-quic_eserrao@quicinc.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1659467920-9095-1-git-send-email-quic_eserrao@quicinc.com> References: <1659467920-9095-1-git-send-email-quic_eserrao@quicinc.com> Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org An interface which is in function suspend state has to send a function wakeup notification to the host in case it needs to initate any data transfer. One notable difference between this and the existing remote wakeup mechanism is that this can be called per-interface, and a UDC would need to know the particular interface number to convey in its Device Notification transaction packet. Hence, we need to introduce a new callback in the gadget_ops structure that UDC device drivers can implement. Similarly add a convenience function in the composite driver which function drivers can call. Add support to handle such requests in the composite layer and invoke the gadget op. Signed-off-by: Elson Roy Serrao --- drivers/usb/gadget/composite.c | 32 ++++++++++++++++++++++++++++++++ drivers/usb/gadget/udc/core.c | 9 +++++++++ include/linux/usb/composite.h | 1 + include/linux/usb/gadget.h | 2 ++ 4 files changed, 44 insertions(+) diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c index 403563c..6bdce23 100644 --- a/drivers/usb/gadget/composite.c +++ b/drivers/usb/gadget/composite.c @@ -490,6 +490,38 @@ int usb_interface_id(struct usb_configuration *config, } EXPORT_SYMBOL_GPL(usb_interface_id); +int usb_func_wakeup(struct usb_function *func) +{ + int ret, id; + unsigned long flags; + + if (!func || !func->config || !func->config->cdev || + !func->config->cdev->gadget) + return -EINVAL; + + DBG(func->config->cdev, "%s function wakeup\n", func->name); + + spin_lock_irqsave(&func->config->cdev->lock, flags); + + for (id = 0; id < MAX_CONFIG_INTERFACES; id++) + if (func->config->interface[id] == func) + break; + + if (id == MAX_CONFIG_INTERFACES) { + ERROR(func->config->cdev, "Invalid function id:%d\n", id); + ret = -EINVAL; + goto err; + } + + ret = usb_gadget_func_wakeup(func->config->cdev->gadget, id); + +err: + spin_unlock_irqrestore(&func->config->cdev->lock, flags); + + return ret; +} +EXPORT_SYMBOL(usb_func_wakeup); + static u8 encode_bMaxPower(enum usb_device_speed speed, struct usb_configuration *c) { diff --git a/drivers/usb/gadget/udc/core.c b/drivers/usb/gadget/udc/core.c index 7886497..fe5c504 100644 --- a/drivers/usb/gadget/udc/core.c +++ b/drivers/usb/gadget/udc/core.c @@ -816,6 +816,15 @@ int usb_gadget_activate(struct usb_gadget *gadget) } EXPORT_SYMBOL_GPL(usb_gadget_activate); +int usb_gadget_func_wakeup(struct usb_gadget *gadget, int interface_id) +{ + if (gadget->speed < USB_SPEED_SUPER || !gadget->ops->func_wakeup) + return -EOPNOTSUPP; + + return gadget->ops->func_wakeup(gadget, interface_id); +} +EXPORT_SYMBOL_GPL(usb_gadget_func_wakeup); + /* ------------------------------------------------------------------------- */ #ifdef CONFIG_HAS_DMA diff --git a/include/linux/usb/composite.h b/include/linux/usb/composite.h index 9d27622..31b35d7 100644 --- a/include/linux/usb/composite.h +++ b/include/linux/usb/composite.h @@ -254,6 +254,7 @@ int config_ep_by_speed_and_alt(struct usb_gadget *g, struct usb_function *f, int config_ep_by_speed(struct usb_gadget *g, struct usb_function *f, struct usb_ep *_ep); +int usb_func_wakeup(struct usb_function *func); #define MAX_CONFIG_INTERFACES 16 /* arbitrary; max 255 */ diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h index 3ad58b7..76f9de4 100644 --- a/include/linux/usb/gadget.h +++ b/include/linux/usb/gadget.h @@ -311,6 +311,7 @@ struct usb_udc; struct usb_gadget_ops { int (*get_frame)(struct usb_gadget *); int (*wakeup)(struct usb_gadget *); + int (*func_wakeup)(struct usb_gadget *gadget, int interface_id); int (*set_selfpowered) (struct usb_gadget *, int is_selfpowered); int (*vbus_session) (struct usb_gadget *, int is_active); int (*vbus_draw) (struct usb_gadget *, unsigned mA); @@ -612,6 +613,7 @@ int usb_gadget_disconnect(struct usb_gadget *gadget); int usb_gadget_deactivate(struct usb_gadget *gadget); int usb_gadget_activate(struct usb_gadget *gadget); int usb_gadget_check_config(struct usb_gadget *gadget); +int usb_gadget_func_wakeup(struct usb_gadget *gadget, int interface_id); #else static inline int usb_gadget_frame_number(struct usb_gadget *gadget) { return 0; }