From patchwork Wed Feb 17 22:14:56 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Drew Fustini X-Patchwork-Id: 1441411 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=xzOKEC/S; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4Dgscb654Jz9sVJ for ; Thu, 18 Feb 2021 09:16:15 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233318AbhBQWP6 (ORCPT ); Wed, 17 Feb 2021 17:15:58 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35598 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233252AbhBQWP4 (ORCPT ); Wed, 17 Feb 2021 17:15:56 -0500 Received: from mail-pl1-x632.google.com (mail-pl1-x632.google.com [IPv6:2607:f8b0:4864:20::632]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6CD4FC061788 for ; Wed, 17 Feb 2021 14:15:16 -0800 (PST) Received: by mail-pl1-x632.google.com with SMTP id a24so81023plm.11 for ; Wed, 17 Feb 2021 14:15:16 -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=OBtTzri1cScqDnwkEDlkQhcrUhTCJcMkyhXW4hdMGZI=; b=xzOKEC/SvVdiXMn25hWsWw23Gk5wWdb3cEWX6ZuKUYsfO2/RdTEmhWpcTLHjHdxciq cf21DYRNUX4EkMAMDWOPNruvDQueIRp7GDA5Uz5RjMx3Kk1bD6QK/n1Xlxc3El5iOX6D TYzW5qKmROR9wFtYT3pm2pA4o4HRBtE7KwxBbUyeG08+jQC21mkCapX2yrgRIZbePN8G hcsgcCElR5M/PopZUVQLYrENTwi2KkbSNHz2wFiKWU+BYUeC4g23ffqbv3wQWjTimsGY J41wxRkz7725JRUVhQhx61/0uLnVr3/jdX2wZRsnWmFM/EV9N2ygY1Q4qWP+BjRlMwNx NfBA== 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=OBtTzri1cScqDnwkEDlkQhcrUhTCJcMkyhXW4hdMGZI=; b=UQE7CitcgFdryWmZTWUzk4nW2yQ5ddLEhkU54R8v7C70iSruzHTf+vxuqItbfl0EGk W/4hkJdvdYunCYG32t6rFq3iPgsDW0kEcOrhM9Mm84v5mvSzADmGFvQWleFA4OyvFgS/ h51UmMEcWiM6uB8Y/tzrtBvaf0UBQj3xJL4FMSzwRi8fwVNaYHcKyNM6t1xQcKp/0lrX bKyNiHKgjpnlATT82DJfU4KZCG0bvCP87izfnv8ZG9NJT3jL7CRd0uKHzUpA0w3bibZm oyLjA/dgI6xcGfeRigwKjmgTRZwA/63Xa5WXVxmRmtCu9tAGFWmdSHNosf8fdp6BE9RO 1LNw== X-Gm-Message-State: AOAM531c/wAXuYbTUX6eAmsKQcaeCV0hD6pO/wjzJNpKQD49TBqeHQzJ X/0XtYqDa7jBGGN+15KbQBiSJw== X-Google-Smtp-Source: ABdhPJz1gMcAGBc39Tdv9NaB9LZDjuNdp5Iy9QEFHfsF4ZOaXNQD0NUFpLnvx67EADxYSZ4rssQfag== X-Received: by 2002:a17:90a:6549:: with SMTP id f9mr932739pjs.17.1613600115969; Wed, 17 Feb 2021 14:15:15 -0800 (PST) Received: from x1.hsd1.or.comcast.net ([2601:1c0:4701:ae70:c31f:9bea:96ec:ef07]) by smtp.gmail.com with ESMTPSA id q43sm3142591pjq.25.2021.02.17.14.15.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 17 Feb 2021 14:15:15 -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 , Jonathan Corbet , linux-doc@vger.kernel.org Cc: Drew Fustini , Geert Uytterhoeven Subject: [PATCH v7 1/3] pinctrl: use to octal permissions for debugfs files Date: Wed, 17 Feb 2021 14:14:56 -0800 Message-Id: <20210217221457.1827266-2-drew@beagleboard.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210217221457.1827266-1-drew@beagleboard.org> References: <20210217221457.1827266-1-drew@beagleboard.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-gpio@vger.kernel.org Switch over pinctrl debugfs files to use octal permissions as they are preferred over symbolic permissions. Refer to commit f90774e1fd27 ("checkpatch: look for symbolic permissions and suggest octal instead"). Note: S_IFREG flag is added to the mode by __debugfs_create_file() in fs/debugfs/inode.c Suggested-by: Joe Perches Suggested-by: Andy Shevchenko Reviewed-by: Andy Shevchenko Reviewed-by: Geert Uytterhoeven Reviewed-by: Tony Lindgren Signed-off-by: Drew Fustini --- drivers/pinctrl/core.c | 12 ++++++------ drivers/pinctrl/pinconf.c | 4 ++-- drivers/pinctrl/pinmux.c | 4 ++-- 3 files changed, 10 insertions(+), 10 deletions(-) diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c index 3663d87f51a0..07458742bc0f 100644 --- a/drivers/pinctrl/core.c +++ b/drivers/pinctrl/core.c @@ -1888,11 +1888,11 @@ static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev) dev_name(pctldev->dev)); return; } - debugfs_create_file("pins", S_IFREG | S_IRUGO, + debugfs_create_file("pins", 0444, device_root, pctldev, &pinctrl_pins_fops); - debugfs_create_file("pingroups", S_IFREG | S_IRUGO, + debugfs_create_file("pingroups", 0444, device_root, pctldev, &pinctrl_groups_fops); - debugfs_create_file("gpio-ranges", S_IFREG | S_IRUGO, + debugfs_create_file("gpio-ranges", 0444, device_root, pctldev, &pinctrl_gpioranges_fops); if (pctldev->desc->pmxops) pinmux_init_device_debugfs(device_root, pctldev); @@ -1914,11 +1914,11 @@ static void pinctrl_init_debugfs(void) return; } - debugfs_create_file("pinctrl-devices", S_IFREG | S_IRUGO, + debugfs_create_file("pinctrl-devices", 0444, debugfs_root, NULL, &pinctrl_devices_fops); - debugfs_create_file("pinctrl-maps", S_IFREG | S_IRUGO, + debugfs_create_file("pinctrl-maps", 0444, debugfs_root, NULL, &pinctrl_maps_fops); - debugfs_create_file("pinctrl-handles", S_IFREG | S_IRUGO, + debugfs_create_file("pinctrl-handles", 0444, debugfs_root, NULL, &pinctrl_fops); } diff --git a/drivers/pinctrl/pinconf.c b/drivers/pinctrl/pinconf.c index 02c075cc010b..d9d54065472e 100644 --- a/drivers/pinctrl/pinconf.c +++ b/drivers/pinctrl/pinconf.c @@ -370,9 +370,9 @@ DEFINE_SHOW_ATTRIBUTE(pinconf_groups); void pinconf_init_device_debugfs(struct dentry *devroot, struct pinctrl_dev *pctldev) { - debugfs_create_file("pinconf-pins", S_IFREG | S_IRUGO, + debugfs_create_file("pinconf-pins", 0444, devroot, pctldev, &pinconf_pins_fops); - debugfs_create_file("pinconf-groups", S_IFREG | S_IRUGO, + debugfs_create_file("pinconf-groups", 0444, devroot, pctldev, &pinconf_groups_fops); } diff --git a/drivers/pinctrl/pinmux.c b/drivers/pinctrl/pinmux.c index bab888fe3f8e..c651b2db0925 100644 --- a/drivers/pinctrl/pinmux.c +++ b/drivers/pinctrl/pinmux.c @@ -676,9 +676,9 @@ DEFINE_SHOW_ATTRIBUTE(pinmux_pins); void pinmux_init_device_debugfs(struct dentry *devroot, struct pinctrl_dev *pctldev) { - debugfs_create_file("pinmux-functions", S_IFREG | S_IRUGO, + debugfs_create_file("pinmux-functions", 0444, devroot, pctldev, &pinmux_functions_fops); - debugfs_create_file("pinmux-pins", S_IFREG | S_IRUGO, + debugfs_create_file("pinmux-pins", 0444, devroot, pctldev, &pinmux_pins_fops); } From patchwork Wed Feb 17 22:14:57 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Drew Fustini X-Patchwork-Id: 1441412 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; 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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 Reviewed-by: Andy Shevchenko Reviewed-by: Tony Lindgren Signed-off-by: Drew Fustini Reviewed-by: Geert Uytterhoeven Tested-by: Geert Uytterhoeven --- drivers/pinctrl/pinmux.c | 102 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 102 insertions(+) diff --git a/drivers/pinctrl/pinmux.c b/drivers/pinctrl/pinmux.c index c651b2db0925..39770af56562 100644 --- a/drivers/pinctrl/pinmux.c +++ b/drivers/pinctrl/pinmux.c @@ -12,6 +12,7 @@ */ #define pr_fmt(fmt) "pinmux core: " fmt +#include #include #include #include @@ -673,6 +674,105 @@ void pinmux_show_setting(struct seq_file *s, DEFINE_SHOW_ATTRIBUTE(pinmux_functions); DEFINE_SHOW_ATTRIBUTE(pinmux_pins); +#define PINMUX_SELECT_MAX 50 +static ssize_t pinmux_select(struct file *file, const char __user *user_buf, + size_t len, loff_t *ppos) +{ + 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) + return -ENOMEM; + + buf = kzalloc(PINMUX_SELECT_MAX, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + ret = strncpy_from_user(buf, user_buf, PINMUX_SELECT_MAX); + if (ret < 0) + goto exit_free_buf; + buf[len-1] = '\0'; + + /* remove leading and trailing spaces of input buffer */ + fname = strstrip(buf); + if (*fname == '\0') { + ret = -EINVAL; + goto exit_free_buf; + } + + /* find a separator which is a spacelike character */ + for (gname = fname; !isspace(*gname); gname++) { + if (*gname == '\0') { + ret = -EINVAL; + goto exit_free_buf; + } + } + *gname = '\0'; + + /* drop extra spaces between function and group names */ + gname = skip_spaces(gname + 1); + if (*gname == '\0') { + ret = -EINVAL; + goto exit_free_buf; + } + + ret = pinmux_func_name_to_selector(pctldev, fname); + if (ret < 0) { + dev_err(pctldev->dev, "invalid function %s in map table\n", fname); + goto exit_free_buf; + } + fsel = ret; + + 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 exit_free_buf; + } + + ret = match_string(groups, num_groups, gname); + if (ret < 0) { + dev_err(pctldev->dev, "invalid group %s", gname); + goto exit_free_buf; + } + + ret = pinctrl_get_group_selector(pctldev, gname); + if (ret < 0) { + dev_err(pctldev->dev, "failed to get group selector for %s", gname); + goto exit_free_buf; + } + gsel = ret; + + ret = pmxops->set_mux(pctldev, fsel, gsel); + if (ret) { + dev_err(pctldev->dev, "set_mux() failed: %d", ret); + goto exit_free_buf; + } + ret = len; + +exit_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 +780,8 @@ 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 */ From patchwork Wed Feb 17 22:14:58 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Drew Fustini X-Patchwork-Id: 1441413 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; 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Suggested-by: Andy Shevchenko Reviewed-by: Andy Shevchenko Reviewed-by: Tony Lindgren Signed-off-by: Drew Fustini --- Documentation/driver-api/pinctl.rst | 37 +++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) diff --git a/Documentation/driver-api/pinctl.rst b/Documentation/driver-api/pinctl.rst index 3d2deaf48841..37bc3bd64cd8 100644 --- a/Documentation/driver-api/pinctl.rst +++ b/Documentation/driver-api/pinctl.rst @@ -1428,3 +1428,40 @@ on the pins defined by group B:: The above has to be done from process context. The reservation of the pins will be done when the state is activated, so in effect one specific pin can be used by different functions at different times on a running system. + + +Debugfs files +============= +These files are created in ``/sys/kernel/debug/pinctrl``: + +- ``pinctrl-devices``: prints each pin controller device along with columns to + indicate support for pinmux and pinconf + +- ``pinctrl-handles``: iterate through the list of pin controller handles and + print the corresponding pinmux maps + +- ``pinctrl-maps``: print all pinctrl maps + +A sub-directory is created inside of ``/sys/kernel/debug/pinctrl`` for each pin +controller device containing these files: + +- ``pins``: prints a line for each pin registered on the pin controller. The + pinctrl driver may add additional information such as register contents. + +- ``gpio-ranges``: print ranges that map gpio lines to pins on the controller + +- ``pingroups``: print all pin groups registered on the pin controller + +- ``pinconf-pins``: print pin config settings for each pin + +- ``pinconf-groups``: print pin config settings per pin group + +- ``pinmux-functions``: print each pin function along with the pin groups that + map to the pin function + +- ``pinmux-pins``: iterate through all pins and print mux owner, gpio owner + and if the pin is a hog + +- ``pinmux-select``: write to this file to activate a pin function and group:: + + echo "" > pinmux-select