From patchwork Wed Sep 9 10:26:31 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kent Gibson X-Patchwork-Id: 254419 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=-12.6 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, SIGNED_OFF_BY, 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 86474C433E2 for ; Wed, 9 Sep 2020 10:32:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4A28821D7D for ; Wed, 9 Sep 2020 10:32:21 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="OHfu8HEk" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729622AbgIIKcP (ORCPT ); Wed, 9 Sep 2020 06:32:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57080 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729251AbgIIK2V (ORCPT ); Wed, 9 Sep 2020 06:28:21 -0400 Received: from mail-pj1-x1042.google.com (mail-pj1-x1042.google.com [IPv6:2607:f8b0:4864:20::1042]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9DAE3C0613ED; Wed, 9 Sep 2020 03:28:20 -0700 (PDT) Received: by mail-pj1-x1042.google.com with SMTP id mm21so1109638pjb.4; Wed, 09 Sep 2020 03:28:20 -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:in-reply-to:references :mime-version:content-transfer-encoding; bh=3IVl2bcGqMzH5g50+3h123xFWFKslEzTZ0XaFzZ2uFU=; b=OHfu8HEkmffdLDUCZ30TKXklbo1uVC5qe/fuJj0x3ilyBvnJ6hv9SNC1SKkPQGxFDt tdJwlh2GEOem6yN1bCxNozsqP6/Teco5rZYUOLZqhrKBBz/9fjbrSCH1UWwkUMNkeoIw lApD5ZVuOQ0bKD5fS+8cBahs4PvT7/fElpYiOP49hqng21B7Ettg2q7aUDIcxDZGwssS xKxx++NwKUssOOqtm6JhqWbgOSMBszW3lxcu7T0fOVzr99K0JmDft2837UXsBtFk63Qm aIc93fL7JxP3/Otxgy8lBpDJZTovb74eVpQrqTLqlnZdhiK+6Czf4VoRQbyfLwmtA9H8 aUxA== 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:in-reply-to :references:mime-version:content-transfer-encoding; bh=3IVl2bcGqMzH5g50+3h123xFWFKslEzTZ0XaFzZ2uFU=; b=ecDz1n9zMtXP6ycAMUwUvMD5clBxYarqSTYvLm62Af+QxwbaaV6m+iElBN/oAx9gq6 Qlymztr9b3CeKkD9nYIXOwfbdkc/uOt+JtgOkZEIcGsldSSoyCDbg7fD/FpgFO3lO1jg 7QeCEjCmoaog5NAawNbyFoVqIZA/mwgdsx3JB9sbLlsivpX/9emlb3T7ytSvHlbC5WIt cc69pEsKiR3g+YXf7LQJiYoZB7zsmw/Q5HEYaZk80Ph+/GIdigdV4iP60fUrP4p6PtM0 7CmpOhmDcoGkfgWGEjTUJUSwlj0PEfJC44mc6LOKns1zYP/FvBarc5c+tWQh+t2XGpIE P/uA== X-Gm-Message-State: AOAM531u+3qApo4Xm6pr7t1BMgOS1Iuv4FGiGIXSog0KuvGyBaJWMW/T Bz7orZK8UBf9L8OuMdkL054B0i16z8I= X-Google-Smtp-Source: ABdhPJxWji2Bk0mXOM5mrF/7YwKSuwZ+je51mCC6ljroTlAlD/LAiTkumkRPJ9VUyoDOmQKN6O9sWA== X-Received: by 2002:a17:90a:81:: with SMTP id a1mr248495pja.136.1599647299162; Wed, 09 Sep 2020 03:28:19 -0700 (PDT) Received: from sol.lan (106-69-184-100.dyn.iinet.net.au. [106.69.184.100]) by smtp.gmail.com with ESMTPSA id c7sm2338168pfj.100.2020.09.09.03.28.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 09 Sep 2020 03:28:18 -0700 (PDT) From: Kent Gibson To: linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org, bgolaszewski@baylibre.com, linus.walleij@linaro.org Cc: Kent Gibson Subject: [PATCH v8 11/20] gpiolib: cdev: support GPIO_V2_LINE_SET_VALUES_IOCTL Date: Wed, 9 Sep 2020 18:26:31 +0800 Message-Id: <20200909102640.1657622-12-warthog618@gmail.com> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200909102640.1657622-1-warthog618@gmail.com> References: <20200909102640.1657622-1-warthog618@gmail.com> MIME-Version: 1.0 Sender: linux-gpio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org Add support for the GPIO_V2_LINE_SET_VALUES_IOCTL. Signed-off-by: Kent Gibson --- drivers/gpio/gpiolib-cdev.c | 61 +++++++++++++++++++++++++++++++++++++ 1 file changed, 61 insertions(+) diff --git a/drivers/gpio/gpiolib-cdev.c b/drivers/gpio/gpiolib-cdev.c index b6da92d9dba1..12d5c6543c15 100644 --- a/drivers/gpio/gpiolib-cdev.c +++ b/drivers/gpio/gpiolib-cdev.c @@ -779,6 +779,65 @@ static long linereq_get_values(struct linereq *lr, void __user *ip) return 0; } +static long linereq_set_values_unlocked(struct linereq *lr, + struct gpio_v2_line_values *lv) +{ + DECLARE_BITMAP(vals, GPIO_V2_LINES_MAX); + struct gpio_desc **descs; + unsigned int i, didx, num_set; + int ret; + + bitmap_zero(vals, GPIO_V2_LINES_MAX); + for (num_set = 0, i = 0; i < lr->num_lines; i++) { + if (lv->mask & BIT_ULL(i)) { + if (!test_bit(FLAG_IS_OUT, &lr->lines[i].desc->flags)) + return -EPERM; + if (lv->bits & BIT_ULL(i)) + __set_bit(num_set, vals); + num_set++; + descs = &lr->lines[i].desc; + } + } + if (num_set == 0) + return -EINVAL; + + if (num_set != 1) { + /* build compacted desc array and values */ + descs = kmalloc_array(num_set, sizeof(*descs), GFP_KERNEL); + if (!descs) + return -ENOMEM; + for (didx = 0, i = 0; i < lr->num_lines; i++) { + if (lv->mask & BIT_ULL(i)) { + descs[didx] = lr->lines[i].desc; + didx++; + } + } + } + ret = gpiod_set_array_value_complex(false, true, num_set, + descs, NULL, vals); + + if (num_set != 1) + kfree(descs); + return ret; +} + +static long linereq_set_values(struct linereq *lr, void __user *ip) +{ + struct gpio_v2_line_values lv; + int ret; + + if (copy_from_user(&lv, ip, sizeof(lv))) + return -EFAULT; + + mutex_lock(&lr->config_mutex); + + ret = linereq_set_values_unlocked(lr, &lv); + + mutex_unlock(&lr->config_mutex); + + return ret; +} + static long linereq_set_config_unlocked(struct linereq *lr, struct gpio_v2_line_config *lc) { @@ -855,6 +914,8 @@ static long linereq_ioctl(struct file *file, unsigned int cmd, if (cmd == GPIO_V2_LINE_GET_VALUES_IOCTL) return linereq_get_values(lr, ip); + else if (cmd == GPIO_V2_LINE_SET_VALUES_IOCTL) + return linereq_set_values(lr, ip); else if (cmd == GPIO_V2_LINE_SET_CONFIG_IOCTL) return linereq_set_config(lr, ip);