From patchwork Fri Feb 12 22:30:15 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Drew Fustini X-Patchwork-Id: 1440111 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-gpio-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=beagleboard-org.20150623.gappssmtp.com header.i=@beagleboard-org.20150623.gappssmtp.com header.a=rsa-sha256 header.s=20150623 header.b=d1vhf4eV; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4DcpFL0sb0z9rx8 for ; Sat, 13 Feb 2021 09:33:58 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232025AbhBLWdj (ORCPT ); Fri, 12 Feb 2021 17:33:39 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56310 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232224AbhBLWbI (ORCPT ); Fri, 12 Feb 2021 17:31:08 -0500 Received: from mail-pg1-x534.google.com (mail-pg1-x534.google.com [IPv6:2607:f8b0:4864:20::534]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3C0B2C061788 for ; Fri, 12 Feb 2021 14:30:27 -0800 (PST) Received: by mail-pg1-x534.google.com with SMTP id j5so549062pgb.11 for ; Fri, 12 Feb 2021 14:30:27 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=beagleboard-org.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=kRQyzW+k1IRH4R+HarppwyyaLUjMFuIFVi6ARjRjxtA=; b=d1vhf4eVeouPnG88sIroW/z7jNiI7TBPiaEhLZb1xHEh1WBWoTfAcVjeEicdBj0/3w AvvaTHfcq1IT4zb/eD5gKooPpDWfaJW4UzHPmo3YGxoRwOYOPzeY0q9TAoBKcqkWCCRZ cIMUmDZlLz4PKZpxCBinDBl0VQUPt0QeCYscJijLwbPaTNTN+fnG+w0kP+HYeA638TWm MNH3JVfQyQ28+uN9FitZsaXDbFomPIPnMmLRAeUnIOTVWrUFsFNOKHJT28QpsVI/WzTp YMBGSX3Sz4x+XCuvRiTSbNkl/ayu06HAOcugCwhu4LngpLAQU0jRC/3SzcjoNAqC89q1 Qwwg== 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=kRQyzW+k1IRH4R+HarppwyyaLUjMFuIFVi6ARjRjxtA=; b=uVPFKVm09MetQMS5WJUqQSse8U1Xf3jgat/k76liMmOGeVsr2ByXVSZ1Yj/zR6cG46 qIAur2PLY4zy41bpuYvLb/VJzgOavbv5mCQQtxMW5d/c7Vg4JpGC8Wgt9dK4HY9hVzdH 9Ty198DA1i8UkNq/CoKNdC+ADGHbPJbv4/xD+3r8C+j4R8fj1nuwyLnGylBFYjMqAMyX 97c9Li6rrBQ8z/z3aN76bCbmvMab14xB4Fye8s3WQQspQf8fCxuYwq/c2jsCcA57afMz OnF0VK7DVlQrSz34la9wD2wWcgqdpTE28lDL1AkvBtI23D92nnMIkUxwwQc48Ty32UuJ F/AQ== X-Gm-Message-State: AOAM532nnrGBWAfwiEAZaI6CrQ5SrCFQfdcIMEAppaqofDagzowEIV7q +ftUa2T/7Zw6GC0xF8vJppe+Ag== X-Google-Smtp-Source: ABdhPJyXHL8XNU0IidIP8aBSb0OBcIjWH1cL5U41FYVG/feor/z/OUWFX8yf4Mx3x09DuPtfwxC61Q== X-Received: by 2002:a63:515e:: with SMTP id r30mr5257278pgl.253.1613169026821; Fri, 12 Feb 2021 14:30:26 -0800 (PST) Received: from x1.hsd1.or.comcast.net ([2601:1c0:4701:ae70:55c2:10c0:c1dd:8558]) by smtp.gmail.com with ESMTPSA id j26sm9530351pfa.35.2021.02.12.14.30.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 Feb 2021 14:30:26 -0800 (PST) From: Drew Fustini To: Linus Walleij , linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, Tony Lindgren , Andy Shevchenko , Alexandre Belloni , Geert Uytterhoeven , Pantelis Antoniou , Jason Kridner , Robert Nelson , Joe Perches , Dan Carpenter Cc: Drew Fustini Subject: [PATCH v5 2/2] pinctrl: pinmux: Add pinmux-select debugfs file Date: Fri, 12 Feb 2021 14:30:15 -0800 Message-Id: <20210212223015.727608-3-drew@beagleboard.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210212223015.727608-1-drew@beagleboard.org> References: <20210212223015.727608-1-drew@beagleboard.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org Add "pinmux-select" to debugfs which will activate a function and group when "" are written to the file. The write operation pinmux_select() handles this by checking that the names map to valid selectors and then calling ops->set_mux(). The existing "pinmux-functions" debugfs file lists the pin functions registered for the pin controller. For example: function: pinmux-uart0, groups = [ pinmux-uart0-pins ] function: pinmux-mmc0, groups = [ pinmux-mmc0-pins ] function: pinmux-mmc1, groups = [ pinmux-mmc1-pins ] function: pinmux-i2c0, groups = [ pinmux-i2c0-pins ] function: pinmux-i2c1, groups = [ pinmux-i2c1-pins ] function: pinmux-spi1, groups = [ pinmux-spi1-pins ] To activate function pinmux-i2c1 and group pinmux-i2c1-pins: echo "pinmux-i2c1 pinmux-i2c1-pins" > pinmux-select Signed-off-by: Drew Fustini --- drivers/pinctrl/pinmux.c | 99 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 99 insertions(+) diff --git a/drivers/pinctrl/pinmux.c b/drivers/pinctrl/pinmux.c index c651b2db0925..c16a6167ac3a 100644 --- a/drivers/pinctrl/pinmux.c +++ b/drivers/pinctrl/pinmux.c @@ -673,6 +673,103 @@ void pinmux_show_setting(struct seq_file *s, DEFINE_SHOW_ATTRIBUTE(pinmux_functions); DEFINE_SHOW_ATTRIBUTE(pinmux_pins); +#define PINMUX_SELECT_MAX 128 +static ssize_t pinmux_select(struct file *file, const char __user *user_buf, + size_t len, loff_t *ppos) +{ + const char *usage = + "usage: echo ' ' > pinmux-select"; + struct seq_file *sfile = file->private_data; + struct pinctrl_dev *pctldev = sfile->private; + const struct pinmux_ops *pmxops = pctldev->desc->pmxops; + const char *const *groups; + char *buf, *fname, *gname; + unsigned int num_groups; + int fsel, gsel, ret; + + if (len > PINMUX_SELECT_MAX) { + dev_err(pctldev->dev, "write too big for buffer"); + return -EINVAL; + } + + buf = kzalloc(PINMUX_SELECT_MAX, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + ret = strncpy_from_user(buf, user_buf, PINMUX_SELECT_MAX); + if (ret < 0) { + dev_err(pctldev->dev, "failed to copy buffer from userspace"); + goto free_buf; + } + buf[len-1] = '\0'; + + fname = strstrip(buf); + if (*fname == '\0') { + dev_err(pctldev->dev, usage); + ret = -EINVAL; + goto free_buf; + } + + gname = strchr(fname, ' '); + if (!gname) { + dev_err(pctldev->dev, usage); + ret = -EINVAL; + goto free_buf; + } + *gname++ = '\0'; + + fsel = pinmux_func_name_to_selector(pctldev, fname); + if (fsel < 0) { + dev_err(pctldev->dev, "invalid function %s in map table\n", fname); + ret = fsel; + goto free_buf; + } + + ret = pmxops->get_function_groups(pctldev, fsel, &groups, &num_groups); + if (ret) { + dev_err(pctldev->dev, "no groups for function %d (%s)", fsel, fname); + goto free_buf; + } + + ret = match_string(groups, num_groups, gname); + if (ret < 0) { + dev_err(pctldev->dev, "invalid group %s", gname); + goto free_buf; + } + + gsel = pinctrl_get_group_selector(pctldev, gname); + if (gsel < 0) { + dev_err(pctldev->dev, "failed to get group selector for %s", gname); + ret = gsel; + goto free_buf; + } + + ret = pmxops->set_mux(pctldev, fsel, gsel); + if (ret) { + dev_err(pctldev->dev, "set_mux() failed: %d", ret); + goto free_buf; + } + ret = len; + +free_buf: + kfree(buf); + + return ret; +} + +static int pinmux_select_open(struct inode *inode, struct file *file) +{ + return single_open(file, NULL, inode->i_private); +} + +static const struct file_operations pinmux_select_ops = { + .owner = THIS_MODULE, + .open = pinmux_select_open, + .write = pinmux_select, + .llseek = no_llseek, + .release = single_release, +}; + void pinmux_init_device_debugfs(struct dentry *devroot, struct pinctrl_dev *pctldev) { @@ -680,6 +777,8 @@ void pinmux_init_device_debugfs(struct dentry *devroot, devroot, pctldev, &pinmux_functions_fops); debugfs_create_file("pinmux-pins", 0444, devroot, pctldev, &pinmux_pins_fops); + debugfs_create_file("pinmux-select", 0200, + devroot, pctldev, &pinmux_select_ops); } #endif /* CONFIG_DEBUG_FS */