From patchwork Tue Nov 10 06:15:34 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Prashant Malani X-Patchwork-Id: 11893327 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 6F943697 for ; Tue, 10 Nov 2020 06:15:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3A8E6206C0 for ; Tue, 10 Nov 2020 06:15:49 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="Q//nWbDM" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728045AbgKJGPs (ORCPT ); Tue, 10 Nov 2020 01:15:48 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40484 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727089AbgKJGPr (ORCPT ); Tue, 10 Nov 2020 01:15:47 -0500 Received: from mail-pg1-x52f.google.com (mail-pg1-x52f.google.com [IPv6:2607:f8b0:4864:20::52f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3B9FFC0613CF for ; Mon, 9 Nov 2020 22:15:47 -0800 (PST) Received: by mail-pg1-x52f.google.com with SMTP id i13so4480494pgm.9 for ; Mon, 09 Nov 2020 22:15:47 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=LCjaa2+ZDzyMpp6rXWIBgooM2TUDsF7cGfUV06VXLIQ=; b=Q//nWbDM7rB33p5BDxBDwYhPt+E2lvFctSHuFsv4XgW5esX7EwMB2z3enN3ARlkvA/ h0RWtNah+ZfkNQv68Zhl9X/zvx4vM8HIAO1WaK+BRCtURckCOA1aH0J7emwHeScNzjMB TO+1Y4bgPoL7qx42nXJQxkRcv2jCBgqMXt/wY= 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:mime-version :content-transfer-encoding; bh=LCjaa2+ZDzyMpp6rXWIBgooM2TUDsF7cGfUV06VXLIQ=; b=gY/o4xufjBqAuka/15/bIZCZ0VJbJKxSnI6r281iE0uoYqKbNJeaNXjxDl+GRZ799j wDtvKyn+KP6PFmuUseh//KrOGyAXXKP7jSOJamhuO8geN3XaT/vvrCReFUPfM1A/RP/P 4FgSFx8snFTLLhDltyiUNpO5diCING48+1E/XTkUxTPy0g1PIjtP/q6rz8CBvKMpUc4F KbIlm3EUtz68jy24d1lyaxY5Ktt+CaQhjfWWeAz7aL4SJFX+s2WJT+WaU+Rmem9Ssa7P piW8ND6HSZ4CqFdOZKh3l8H1tvvELJyaf31WR6K0GEXF/9e3lCSnHd+f/7KT4FEdhCwN cbaQ== X-Gm-Message-State: AOAM530ZuZ8gLjPfEjpIsQHUCJQVaapApjB3bTDDv1jFoaxMMcOuh0Hc wii+KHR4Jx1yZ2dXctmgDnO9ww== X-Google-Smtp-Source: ABdhPJxBLQdt29k4/3op2GxtMZs7G0IH6QrJy72JpIt3FwQNDvQJ0isZGLLaR0RU2nSUU4qAmPZECQ== X-Received: by 2002:a17:90a:bb8b:: with SMTP id v11mr3346952pjr.57.1604988946611; Mon, 09 Nov 2020 22:15:46 -0800 (PST) Received: from pmalani2.mtv.corp.google.com ([2620:15c:202:201:a28c:fdff:fef0:49dd]) by smtp.gmail.com with ESMTPSA id gw10sm1499932pjb.24.2020.11.09.22.15.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 09 Nov 2020 22:15:45 -0800 (PST) From: Prashant Malani To: linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, gregkh@linuxfoundation.org Cc: Prashant Malani , Benson Leung , Heikki Krogerus , Enric Balletbo i Serra , Guenter Roeck Subject: [PATCH v2 1/2] usb: typec: Add number of altmodes partner attr Date: Mon, 9 Nov 2020 22:15:34 -0800 Message-Id: <20201110061535.2163599-1-pmalani@chromium.org> X-Mailer: git-send-email 2.29.2.222.g5d2a92d10f8-goog MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Add a user-visible attribute for the number of alternate modes available in a partner. This allows userspace to determine whether there are any remaining alternate modes left to be registered by the kernel driver. It can begin executing any policy state machine after all available alternate modes have been registered with the connector class framework. This value is set to "-1" initially, signifying that a valid number of alternate modes haven't been set for the partner. Also add a sysfs file which exposes this attribute. The file remains hidden as long as the attribute value is -1. Cc: Benson Leung Cc: Heikki Krogerus Signed-off-by: Prashant Malani Reviewed-by: Heikki Krogerus --- Changes in v2: - Added ABI/testing documentation entry for added sysfs file. - Changed name of the sysfs file to "number_of_alternate_modes" based on review comments. - Added is_visible() logic suggested by Heikki in the comments of v1. - Updated commit message. v1: https://lore.kernel.org/lkml/20200701003149.3101219-1-pmalani@chromium.org/ Documentation/ABI/testing/sysfs-class-typec | 8 +++ drivers/usb/typec/class.c | 66 ++++++++++++++++++++- include/linux/usb/typec.h | 1 + 3 files changed, 74 insertions(+), 1 deletion(-) diff --git a/Documentation/ABI/testing/sysfs-class-typec b/Documentation/ABI/testing/sysfs-class-typec index b834671522d6..73ac7b461ae5 100644 --- a/Documentation/ABI/testing/sysfs-class-typec +++ b/Documentation/ABI/testing/sysfs-class-typec @@ -134,6 +134,14 @@ Description: Shows if the partner supports USB Power Delivery communication: Valid values: yes, no +What: /sys/class/typec/-partner/number_of_alternate_modes +Date: November 2020 +Contact: Prashant Malani +Description: + Shows the number of alternate modes which are advertised by the partner + during Power Delivery discovery. This file remains hidden until a value + greater than or equal to 0 is set by Type C port driver. + What: /sys/class/typec/-partner>/identity/ Date: April 2017 Contact: Heikki Krogerus diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c index 35eec707cb51..c7412ddbd311 100644 --- a/drivers/usb/typec/class.c +++ b/drivers/usb/typec/class.c @@ -33,6 +33,7 @@ struct typec_partner { struct usb_pd_identity *identity; enum typec_accessory accessory; struct ida mode_ids; + int num_altmodes; }; struct typec_port { @@ -532,12 +533,43 @@ static ssize_t supports_usb_power_delivery_show(struct device *dev, } static DEVICE_ATTR_RO(supports_usb_power_delivery); +static ssize_t number_of_alternate_modes_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct typec_partner *p = to_typec_partner(dev); + + return sysfs_emit(buf, "%d\n", p->num_altmodes); +} +static DEVICE_ATTR_RO(number_of_alternate_modes); + static struct attribute *typec_partner_attrs[] = { &dev_attr_accessory_mode.attr, &dev_attr_supports_usb_power_delivery.attr, + &dev_attr_number_of_alternate_modes.attr, + NULL +}; + +static umode_t typec_partner_attr_is_visible(struct kobject *kobj, struct attribute *attr, int n) +{ + struct typec_partner *partner = to_typec_partner(kobj_to_dev(kobj)); + + if (attr == &dev_attr_number_of_alternate_modes.attr) { + if (partner->num_altmodes < 0) + return 0; + } + + return attr->mode; +} + +static struct attribute_group typec_partner_group = { + .is_visible = typec_partner_attr_is_visible, + .attrs = typec_partner_attrs +}; + +static const struct attribute_group *typec_partner_groups[] = { + &typec_partner_group, NULL }; -ATTRIBUTE_GROUPS(typec_partner); static void typec_partner_release(struct device *dev) { @@ -570,6 +602,37 @@ int typec_partner_set_identity(struct typec_partner *partner) } EXPORT_SYMBOL_GPL(typec_partner_set_identity); +/** + * typec_partner_set_num_altmodes - Set the number of available partner altmodes + * @partner: The partner to be updated. + * @num_alt_modes: The number of altmodes we want to specify as available. + * + * This routine is used to report the number of alternate modes supported by the + * partner. This value is *not* enforced in alternate mode registration routines. + * + * @partner.num_altmodes is set to -1 on partner registration, denoting that + * a valid value has not been set for it yet. + * + * Returns 0 on success or negative error number on failure. + */ +int typec_partner_set_num_altmodes(struct typec_partner *partner, int num_altmodes) +{ + int ret; + + if (num_altmodes < 0) + return -EINVAL; + + partner->num_altmodes = num_altmodes; + ret = sysfs_update_group(&partner->dev.kobj, &typec_partner_group); + if (ret < 0) + return ret; + + sysfs_notify(&partner->dev.kobj, NULL, "number_of_alternate_modes"); + + return 0; +} +EXPORT_SYMBOL_GPL(typec_partner_set_num_altmodes); + /** * typec_partner_register_altmode - Register USB Type-C Partner Alternate Mode * @partner: USB Type-C Partner that supports the alternate mode @@ -612,6 +675,7 @@ struct typec_partner *typec_register_partner(struct typec_port *port, ida_init(&partner->mode_ids); partner->usb_pd = desc->usb_pd; partner->accessory = desc->accessory; + partner->num_altmodes = -1; if (desc->identity) { /* diff --git a/include/linux/usb/typec.h b/include/linux/usb/typec.h index 6be558045942..bc6b1a71cb8a 100644 --- a/include/linux/usb/typec.h +++ b/include/linux/usb/typec.h @@ -126,6 +126,7 @@ struct typec_altmode_desc { enum typec_port_data roles; }; +int typec_partner_set_num_altmodes(struct typec_partner *partner, int num_altmodes); struct typec_altmode *typec_partner_register_altmode(struct typec_partner *partner, const struct typec_altmode_desc *desc);