From patchwork Fri Dec 3 13:29:56 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bartosz Golaszewski X-Patchwork-Id: 520402 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 2772CC433F5 for ; Fri, 3 Dec 2021 13:30:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1352315AbhLCNdu (ORCPT ); Fri, 3 Dec 2021 08:33:50 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39458 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244857AbhLCNdt (ORCPT ); Fri, 3 Dec 2021 08:33:49 -0500 Received: from mail-wm1-x332.google.com (mail-wm1-x332.google.com [IPv6:2a00:1450:4864:20::332]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5F2ABC061757 for ; Fri, 3 Dec 2021 05:30:25 -0800 (PST) Received: by mail-wm1-x332.google.com with SMTP id p27-20020a05600c1d9b00b0033bf8532855so2219245wms.3 for ; Fri, 03 Dec 2021 05:30:25 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bgdev-pl.20210112.gappssmtp.com; s=20210112; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=lwhaUG8BV21D7X8P/5YaBthI1oupop5F8Ojb8aCEATw=; b=55vBNi+8kGb5EpFV3a8gLK41v0xjQwWFIvJZsBj5vj/S0ydkM6oc/YNSQuHpsjsHsA F/U29G4qjbXqPf/6pG8sCYEGTugkVmXhIe3v9Y705cXDBjSXlMOk2Y1cAM6tRoeymhQt 7t4fd/sAfiIAnx4vd8lsOH0hjHNr8Cg7Zi+AtRL/efhiQNfeJfldwI9Wq63S7vkvcmTt L+0ILNGhtYX9/dYqIhzqhPx93bh6gV0FKfPXnYHc9UuBfL5418R+LUrW+SKzHnbTkPrO Nx9+cBrYxHKgRyvZx9L4LG9zGnvT8TkTbnTcb/FwqEiIbcyTSb2/AIkrX9AqhQW6cvri L2Og== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=lwhaUG8BV21D7X8P/5YaBthI1oupop5F8Ojb8aCEATw=; b=tEhvit8WqmfH7Q/vybkIMGVaxR6eSF31HaizRrrZsqEKeHvUCxkCQv0bExKOG0xzDo sNWfMwPfgyX76U4dmXzBiMjHpGIcbApFHpnwVQFLqRIKbI7a2vBnQnHlZ6WnKkIMwjxl NoIGam2e4MUSVXdKeVN2aIVTV8d9wlTylKyZnH48m/JobEUCOpnzmrHme1xKnGbsOLR6 tMBq2lT6FB0RIx/yANL72gDQhk1ZltEkXmwq3U7Wov74CRMNws5mXDZKbBqrgGoliDeU taxcUWe2u68RJT9EVkmEkfpSqNQJ9+s/KbsSnz+3Q0O1JiU1PDfF48AkpnyNvpLAgt3/ yMcQ== X-Gm-Message-State: AOAM530sbA/1/dPQJnzcf47TvPraTesF65owXGU6C2KwEgSGnvw652VV m2IAeoJxBP3FxOIfiv9c4TN8AQ== X-Google-Smtp-Source: ABdhPJwNVofpclBtVapBhWHnRLCZpjdeR//+78Qwf/bGWW9GV94c20PEIl1tZQzT6iORFIYgNYoTWw== X-Received: by 2002:a7b:cf35:: with SMTP id m21mr14568512wmg.140.1638538223852; Fri, 03 Dec 2021 05:30:23 -0800 (PST) Received: from debian-brgl.home ([2a01:cb1d:334:ac00:7d50:ff5:f5c1:e225]) by smtp.gmail.com with ESMTPSA id j11sm2755910wrt.3.2021.12.03.05.30.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 03 Dec 2021 05:30:23 -0800 (PST) From: Bartosz Golaszewski To: Kent Gibson , Linus Walleij , Andy Shevchenko , Shuah Khan , Geert Uytterhoeven , Viresh Kumar Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, Bartosz Golaszewski Subject: [PATCH v12 0/7] gpio-sim: configfs-based GPIO simulator Date: Fri, 3 Dec 2021 14:29:56 +0100 Message-Id: <20211203133003.31786-1-brgl@bgdev.pl> X-Mailer: git-send-email 2.30.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Another iteration of gpio-sim patches. This time the changes are quite small. I removed the ifdefs from gpiolib.c as requested by Andy. In this version gpiolib-of will also prefer fwnodes over of_nodes and - if set - will convert them to of_nodes before proceeding. Tested both with configfs as well as device-tree. v1 -> v2: - add selftests for gpio-sim - add helper programs for selftests - update the configfs rename callback to work with the new API introduced in v5.11 - fix a missing quote in the documentation - use !! whenever using bits operation that are required to return 0 or 1 - use provided bitmap API instead of reimplementing copy or fill operations - fix a deadlock in gpio_sim_direction_output() - add new read-only configfs attributes for mapping of configfs items to GPIO device names - and address other minor issues pointed out in reviews of v1 v2 -> v3: - use devm_bitmap_alloc() instead of the zalloc variant if we're initializing the bitmap with 1s - drop the patch exporting device_is_bound() - don't return -ENODEV from dev_nam and chip_name configfs attributes, return a string indicating that the device is not available yet ('n/a') - fix indentation where it makes sense - don't protect IDA functions which use their own locking and where it's not needed - use kmemdup() instead of kzalloc() + memcpy() - collected review tags - minor coding style fixes v3 -> v4: - return 'none' instead of 'n/a' from dev_name and chip_name before the device is registered - use sysfs_emit() instead of s*printf() - drop GPIO_SIM_MAX_PROP as it's only used in an array's definition where it's fine to hardcode the value v4 -> v5: - drop lib patches that are already upstream - use BIT() instead of (1UL << bit) for flags - fix refcounting for the configfs_dirent in rename() - drop d_move() from the rename() callback - free memory allocated for the live and pending groups in configfs_d_iput() and not in detach_groups() - make sure that if a group of some name is in the live directory, a new group with the same name cannot be created in the pending directory v5 -> v6: - go back to using (1UL << bit) instead of BIT() - if the live group dentry doesn't exist for whatever reason at the time when mkdir() in the pending group is called (would be a BUG()), return -ENOENT instead of -EEXIST which should only be returned if given subsystem already exists in either live or pending group v6 -> v7: - as detailed by Andy in commit 6fda593f3082 ("gpio: mockup: Convert to use software nodes") removing device properties after the platform device is removed but before the GPIO device gets dropped can lead to a use-after-free bug - use software nodes to manually control the freeing of the properties v7 -> v8: - fixed some minor coding style issues as pointed out by Andy v8 -> v9: - dropped the patches implementing committable-items and reworked the driver to not use them - reworked the gpio-line-names property and configuring specific lines in general - many smaller tweaks here and there v9 -> v10: - make writing to 'live' wait for the probe to finish and report an error to user-space if it failed - add the ability to hog lines from the kernel-space - rework locking (drop separate locks for line context objects) - rework the sysfs interface (create a separate group for each line with a constant number of attributes instead of going the other way around) v10 -> v11: - rework the configfs structure to represent a deeper hierarchy that gpiolib supports, namely: multiple banks per platform device v11 -> v12: - simplify patch 2/7 by removing any mentions of OF from gpiolib.c - improve the documentation by adding rest markups - add a device-tree sample to the docs - drop some trailing whitespaces from the driver - make gpio_sim_make_bank_swnode() static - fix coding style in patch 6/7 - add patch 3/7 that makes the OF part of gpiolib prefer to use gpio_chip's fwnode (if set) over of_node Bartosz Golaszewski (7): gpiolib: provide gpiod_remove_hogs() gpiolib: allow to specify the firmware node in struct gpio_chip gpiolib: of: make fwnode take precedence in struct gpio_chip gpio: sim: new testing module selftests: gpio: provide a helper for reading chip info selftests: gpio: add a helper for reading GPIO line names selftests: gpio: add test cases for gpio-sim Documentation/admin-guide/gpio/gpio-sim.rst | 134 ++ drivers/gpio/Kconfig | 8 + drivers/gpio/Makefile | 1 + drivers/gpio/gpio-sim.c | 1594 +++++++++++++++++ drivers/gpio/gpiolib-of.c | 3 + drivers/gpio/gpiolib.c | 18 +- include/linux/gpio/driver.h | 2 + include/linux/gpio/machine.h | 2 + tools/testing/selftests/gpio/.gitignore | 2 + tools/testing/selftests/gpio/Makefile | 4 +- tools/testing/selftests/gpio/config | 1 + tools/testing/selftests/gpio/gpio-chip-info.c | 57 + tools/testing/selftests/gpio/gpio-line-name.c | 55 + tools/testing/selftests/gpio/gpio-sim.sh | 396 ++++ 14 files changed, 2274 insertions(+), 3 deletions(-) create mode 100644 Documentation/admin-guide/gpio/gpio-sim.rst create mode 100644 drivers/gpio/gpio-sim.c create mode 100644 tools/testing/selftests/gpio/gpio-chip-info.c create mode 100644 tools/testing/selftests/gpio/gpio-line-name.c create mode 100755 tools/testing/selftests/gpio/gpio-sim.sh Reviewed-by: Andy Shevchenko