From patchwork Fri Mar 19 11:00:19 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: William Breathitt Gray X-Patchwork-Id: 12150739 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9445CC433E0 for ; Fri, 19 Mar 2021 11:01:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4CF8464F04 for ; Fri, 19 Mar 2021 11:01:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229640AbhCSLBN (ORCPT ); Fri, 19 Mar 2021 07:01:13 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38548 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229524AbhCSLBE (ORCPT ); Fri, 19 Mar 2021 07:01:04 -0400 Received: from mail-pl1-x631.google.com (mail-pl1-x631.google.com [IPv6:2607:f8b0:4864:20::631]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B6A9FC06174A; Fri, 19 Mar 2021 04:01:04 -0700 (PDT) Received: by mail-pl1-x631.google.com with SMTP id t20so2783125plr.13; Fri, 19 Mar 2021 04:01:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=Gkq0h39ISzzco6BRVF3l2YW0jWOrafmPSnRJn1TiGBE=; b=uRP4e+9Kn4f59ka1kUSSwEb3q24z/MByYaK3NP0QTMIFIc4pNFOcb9vZkTeQHglH5t /p6oF/+lZrUCr43oTuYXu+2PuR6MzQU4tiKyOCyFTEZUsWKpBfuZw8I/8MFlhrjVw80D 99pB1rJpCuGxARVxqe62Yw42ooQaBuZwvo2A3AV1BVbso6AJ5c6ayFpJaBZRcR4U+Nzl hoF6Pce7B2hcH/2BQodtukTt2emugBT7nyPwVxxWU4lSsujxPG/++Ax6aM/dYVs+MygO uozk+GKYq6biS2QzRs8kDdqsBsZC5niVgiqdxUmtqL0q+xIu35GNcuTTrGK69TOhp64G CxYg== 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=Gkq0h39ISzzco6BRVF3l2YW0jWOrafmPSnRJn1TiGBE=; b=NMqwP2fVxxnqkRluRcsrHesRStTyAMVy7T/0F6xPfdxRwWgG0Sxr1/ihKhseFDTl0i cg7onaHaxQzcPcXD0nxc1riBFE8kTO0gLsXlMpRjqTV947bJ7lvaul5xF4IDFf0VG116 6CeHhHVngxWGB9hqhq7L7CcdG/9Dt5v6kute9Fjpq2R+YSvh4ogWKZWPeNderO8MXcDF T+tx8+GnaRbVXaTFIzQOCbY7DSpSvEWf96mGlUgF83JuXZYiX9SpL3ufes1lAlK2aslT xi4dBRD2dML+LdIWMnwsCyoa6zLqgqYssGS9P7QKrXhtkhmgzKhPATnA2GgNHiY/x4Su IRYg== X-Gm-Message-State: AOAM5313UQmkIe4eVX6WieK3tJJerw26I6MsQYOQsnVu6AVd+oB0BP4p V3nqmGBf3LuYRskSl6RmQfE= X-Google-Smtp-Source: ABdhPJxGTnmR2hTYczbszDLnOs1JGCJVlO6VRBFrakMfJEu2aNWDy/wUXdBOdAz+N66YrAmJ4PHVeA== X-Received: by 2002:a17:902:b7c5:b029:e6:1a9f:5f55 with SMTP id v5-20020a170902b7c5b02900e61a9f5f55mr13717024plz.57.1616151664203; Fri, 19 Mar 2021 04:01:04 -0700 (PDT) Received: from localhost.localdomain ([156.146.35.76]) by smtp.gmail.com with ESMTPSA id i22sm4879042pjz.56.2021.03.19.04.00.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 19 Mar 2021 04:01:03 -0700 (PDT) From: William Breathitt Gray To: jic23@kernel.org Cc: kernel@pengutronix.de, linux-stm32@st-md-mailman.stormreply.com, a.fatoum@pengutronix.de, kamel.bouhara@bootlin.com, gwendal@chromium.org, alexandre.belloni@bootlin.com, david@lechnology.com, linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, syednwaris@gmail.com, patrick.havelange@essensium.com, fabrice.gasnier@st.com, mcoquelin.stm32@gmail.com, alexandre.torgue@st.com, o.rempel@pengutronix.de, William Breathitt Gray Subject: [PATCH v10 00/33] Introduce the Counter character device interface Date: Fri, 19 Mar 2021 20:00:19 +0900 Message-Id: X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org Changes in v10: - Use sysfs_emit_at() in enums_available_show() and strs_available_show() in order to concatenate list of strings - Use sprintf() in counter_comp_id_show(); only printing an size_t so there is no risk of exceeding PAGE_SIZE Note that this revision is based on top of 3 prerequisite patches: * counter: stm32-timer-cnt: fix ceiling miss-alignment with reload register * counter: stm32-timer-cnt: fix ceiling write max value * counter: stm32-timer-cnt: Report count function when SLAVE_MODE_DISABLED I pulled out a lot of bits and pieces to their own patches; hopefully that makes reviewing this patchset much simpler than before. This patchset is also available on my personal public git repo for anyone who wants a quick way to clone: https://gitlab.com/vilhelmgray/iio/-/tree/counter_chrdev_v10 The patches preceding "counter: Internalize sysfs interface code" are primarily cleanup and fixes that can be picked up and applied now to the IIO tree if so desired. The "counter: Internalize sysfs interface code" patch as well may be considered for pickup because it is relatively safe and makes no changes to the userspace interface. To summarize the main points of this patchset: there are no changes to the existing Counter sysfs userspace interface; a Counter character device interface is introduced that allows Counter events and associated data to be read() by userspace; the events_configure() and watch_validate() driver callbacks are introduced to support Counter events; and IRQ support is added to the 104-QUAD-8 driver, serving as an example of how to support the new Counter events functionality. Something that should still be discussed: should the struct counter_event "status" member be 8 bits or 32 bits wide? This member will provide the return status (system error number) of an event operation. William Breathitt Gray (33): docs: counter: Consolidate Counter sysfs attributes documentation docs: counter: Fix spelling counter: 104-quad-8: Remove pointless comment counter: 104-quad-8: Return error when invalid mode during ceiling_write counter: 104-quad-8: Annotate hardware config module parameter counter: 104-quad-8: Add const qualifiers for quad8_preset_register_set counter: 104-quad-8: Add const qualifier for functions_list array counter: interrupt-cnt: Add const qualifier for functions_list array counter: microchip-tcb-capture: Add const qualifier for functions_list array counter: stm32-lptimer-cnt: Add const qualifier for functions_list array counter: stm32-timer-cnt: Add const qualifier for functions_list array counter: 104-quad-8: Add const qualifier for actions_list array counter: ftm-quaddec: Add const qualifier for actions_list array counter: interrupt-cnt: Add const qualifier for actions_list array counter: microchip-tcb-capture: Add const qualifier for actions_list array counter: stm32-lptimer-cnt: Add const qualifier for actions_list array counter: stm32-timer-cnt: Add const qualifier for actions_list array counter: Return error code on invalid modes counter: Standardize to ERANGE for limit exceeded errors counter: Rename counter_signal_value to counter_signal_level counter: Rename counter_count_function to counter_function counter: Internalize sysfs interface code counter: Update counter.h comments to reflect sysfs internalization docs: counter: Update to reflect sysfs internalization counter: Move counter enums to uapi header counter: Add character device interface docs: counter: Document character device interface tools/counter: Create Counter tools counter: Implement signalZ_action_component_id sysfs attribute counter: Implement *_component_id sysfs attributes counter: Implement events_queue_size sysfs attribute counter: 104-quad-8: Replace mutex with spinlock counter: 104-quad-8: Add IRQ support for the ACCES 104-QUAD-8 Documentation/ABI/testing/sysfs-bus-counter | 112 +- .../ABI/testing/sysfs-bus-counter-104-quad-8 | 61 - .../ABI/testing/sysfs-bus-counter-ftm-quaddec | 16 - Documentation/driver-api/generic-counter.rst | 368 +++- .../userspace-api/ioctl/ioctl-number.rst | 1 + MAINTAINERS | 7 +- drivers/counter/104-quad-8.c | 739 ++++---- drivers/counter/Kconfig | 6 +- drivers/counter/Makefile | 1 + drivers/counter/counter-chrdev.c | 486 ++++++ drivers/counter/counter-chrdev.h | 14 + drivers/counter/counter-core.c | 192 +++ drivers/counter/counter-sysfs.c | 953 +++++++++++ drivers/counter/counter-sysfs.h | 13 + drivers/counter/counter.c | 1496 ----------------- drivers/counter/ftm-quaddec.c | 61 +- drivers/counter/interrupt-cnt.c | 75 +- drivers/counter/microchip-tcb-capture.c | 105 +- drivers/counter/stm32-lptimer-cnt.c | 176 +- drivers/counter/stm32-timer-cnt.c | 149 +- drivers/counter/ti-eqep.c | 221 +-- include/linux/counter.h | 716 ++++---- include/linux/counter_enum.h | 45 - include/uapi/linux/counter.h | 133 ++ tools/Makefile | 13 +- tools/counter/Build | 1 + tools/counter/Makefile | 53 + tools/counter/counter_example.c | 95 ++ 28 files changed, 3522 insertions(+), 2786 deletions(-) delete mode 100644 Documentation/ABI/testing/sysfs-bus-counter-104-quad-8 delete mode 100644 Documentation/ABI/testing/sysfs-bus-counter-ftm-quaddec create mode 100644 drivers/counter/counter-chrdev.c create mode 100644 drivers/counter/counter-chrdev.h create mode 100644 drivers/counter/counter-core.c create mode 100644 drivers/counter/counter-sysfs.c create mode 100644 drivers/counter/counter-sysfs.h delete mode 100644 drivers/counter/counter.c delete mode 100644 include/linux/counter_enum.h create mode 100644 include/uapi/linux/counter.h create mode 100644 tools/counter/Build create mode 100644 tools/counter/Makefile create mode 100644 tools/counter/counter_example.c base-commit: 69333b92c35cdd6cdfc90c4f5daa418cfeb40213 prerequisite-patch-id: 41fda3a386861edad110c644567fad373a5a175e prerequisite-patch-id: c6c2ab3173f5a0136d1e9b7b96ccd115fa35d66e prerequisite-patch-id: 7e3cd78924d79890b690f3029e0d4f5b3902a73c