From patchwork Wed Nov 2 15:17:52 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Daniel Scally X-Patchwork-Id: 622063 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 064ADC433FE for ; Wed, 2 Nov 2022 15:18:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230242AbiKBPS3 (ORCPT ); Wed, 2 Nov 2022 11:18:29 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57900 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230132AbiKBPST (ORCPT ); Wed, 2 Nov 2022 11:18:19 -0400 Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [213.167.242.64]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5453F209A2 for ; Wed, 2 Nov 2022 08:18:18 -0700 (PDT) Received: from mail.ideasonboard.com (cpc141996-chfd3-2-0-cust928.12-3.cable.virginm.net [86.13.91.161]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 0DC3A134B; Wed, 2 Nov 2022 16:18:16 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1667402296; bh=/L6bJWDv3TfAii+XuX37SzLhJ+40YrfvUIW3xRZqaHs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=tlv8/83BnTuwVxeLyCIxZao0KZYccbAgkGi6GjVvR/JPy1YMib6GEodtnWQypB42L Ih5+Ni8aE3dgOHXWcGnK17n/oFp3VbZrU8I4lCOV/OLK8cocxLPS7je/Ty27bSSssJ iXpFsKN55ftTBwACY8hBaD+cRxqClx7YdzJxsCco= From: Daniel Scally To: linux-usb@vger.kernel.org Cc: balbi@kernel.org, gregkh@linuxfoundation.org, laurent.pinchart@ideasonboard.com, kieran.bingham@ideasonboard.com, torleiv@huddly.com, mgr@pengutronix.de, Daniel Scally Subject: [PATCH 1/4] usb: gadget: uvc: Make bSourceID read/write Date: Wed, 2 Nov 2022 15:17:52 +0000 Message-Id: <20221102151755.1022841-2-dan.scally@ideasonboard.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221102151755.1022841-1-dan.scally@ideasonboard.com> References: <20221102151755.1022841-1-dan.scally@ideasonboard.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org At the moment, the UVC function graph is hardcoded IT -> PU -> OT. To add XU support we need the ability to insert the XU descriptors into the chain. To facilitate that, make the output terminal's bSourceID attribute writeable so that we can configure its source. Signed-off-by: Daniel Scally --- drivers/usb/gadget/function/uvc_configfs.c | 59 +++++++++++++++++++++- 1 file changed, 58 insertions(+), 1 deletion(-) diff --git a/drivers/usb/gadget/function/uvc_configfs.c b/drivers/usb/gadget/function/uvc_configfs.c index 4303a3283ba0..832565730d22 100644 --- a/drivers/usb/gadget/function/uvc_configfs.c +++ b/drivers/usb/gadget/function/uvc_configfs.c @@ -483,11 +483,68 @@ UVC_ATTR_RO(uvcg_default_output_, cname, aname) UVCG_DEFAULT_OUTPUT_ATTR(b_terminal_id, bTerminalID, 8); UVCG_DEFAULT_OUTPUT_ATTR(w_terminal_type, wTerminalType, 16); UVCG_DEFAULT_OUTPUT_ATTR(b_assoc_terminal, bAssocTerminal, 8); -UVCG_DEFAULT_OUTPUT_ATTR(b_source_id, bSourceID, 8); UVCG_DEFAULT_OUTPUT_ATTR(i_terminal, iTerminal, 8); #undef UVCG_DEFAULT_OUTPUT_ATTR +static ssize_t uvcg_default_output_b_source_id_show(struct config_item *item, + char *page) +{ + struct config_group *group = to_config_group(item); + struct f_uvc_opts *opts; + struct config_item *opts_item; + struct mutex *su_mutex = &group->cg_subsys->su_mutex; + struct uvc_output_terminal_descriptor *cd; + int result; + + mutex_lock(su_mutex); /* for navigating configfs hierarchy */ + + opts_item = group->cg_item.ci_parent->ci_parent-> + ci_parent->ci_parent; + opts = to_f_uvc_opts(opts_item); + cd = &opts->uvc_output_terminal; + + mutex_lock(&opts->lock); + result = sprintf(page, "%u\n", le8_to_cpu(cd->bSourceID)); + mutex_unlock(&opts->lock); + + mutex_unlock(su_mutex); + + return result; +} + +static ssize_t uvcg_default_output_b_source_id_store(struct config_item *item, + const char *page, size_t len) +{ + struct config_group *group = to_config_group(item); + struct f_uvc_opts *opts; + struct config_item *opts_item; + struct mutex *su_mutex = &group->cg_subsys->su_mutex; + struct uvc_output_terminal_descriptor *cd; + int result; + u8 num; + + mutex_lock(su_mutex); /* for navigating configfs hierarchy */ + + opts_item = group->cg_item.ci_parent->ci_parent-> + ci_parent->ci_parent; + opts = to_f_uvc_opts(opts_item); + cd = &opts->uvc_output_terminal; + + result = kstrtou8(page, 0, &num); + if (result) + return result; + + mutex_lock(&opts->lock); + cd->bSourceID = num; + mutex_unlock(&opts->lock); + + mutex_unlock(su_mutex); + + return len; +} +UVC_ATTR(uvcg_default_output_, b_source_id, bSourceID); + static struct configfs_attribute *uvcg_default_output_attrs[] = { &uvcg_default_output_attr_b_terminal_id, &uvcg_default_output_attr_w_terminal_type,