Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755519AbbDTOBR (ORCPT ); Mon, 20 Apr 2015 10:01:17 -0400 Received: from mga14.intel.com ([192.55.52.115]:28322 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755294AbbDTOBN (ORCPT ); Mon, 20 Apr 2015 10:01:13 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.11,609,1422950400"; d="scan'208";a="682778526" From: Daniel Baluta To: jic23@kernel.org Cc: jlbec@evilplan.org, lars@metafoo.de, knaack.h@gmx.de, linux-kernel@vger.kernel.org, linux-iio@vger.kernel.org, octavian.purdila@intel.com, pebolle@tiscali.nl, patrick.porlan@intel.com, adriana.reus@intel.com, constantin.musca@intel.com, marten@intuitiveaerial.com Subject: [PATCH v4 2/4] iio: core: Introduce IIO configfs support Date: Mon, 20 Apr 2015 17:02:41 +0300 Message-Id: <1429538563-23430-3-git-send-email-daniel.baluta@intel.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1429538563-23430-1-git-send-email-daniel.baluta@intel.com> References: <1429538563-23430-1-git-send-email-daniel.baluta@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5393 Lines: 189 This creates an IIO configfs subystem named "iio", with a default "triggers" group. Triggers group is used for handling software triggers. To create a new software trigger one must create a directory inside the trigger directory. Software trigger name MUST follow the following convention: * - Where: * , specifies the interrupt source (e.g: hrtimer) * , specifies the IIO device trigger name Failing to follow this convention will result in an directory creation error. E.g, assuming that hrtimer trigger type is registered with IIO software trigger core: $ mkdir /config/iio/triggers/hrtimer-instance1 Signed-off-by: Daniel Baluta --- drivers/iio/Kconfig | 8 +++ drivers/iio/Makefile | 1 + drivers/iio/industrialio-configfs.c | 117 ++++++++++++++++++++++++++++++++++++ 3 files changed, 126 insertions(+) create mode 100644 drivers/iio/industrialio-configfs.c diff --git a/drivers/iio/Kconfig b/drivers/iio/Kconfig index de7f1d9..c310156 100644 --- a/drivers/iio/Kconfig +++ b/drivers/iio/Kconfig @@ -18,6 +18,14 @@ config IIO_BUFFER Provide core support for various buffer based data acquisition methods. +config IIO_CONFIGFS + tristate "Enable IIO configuration via configfs" + select CONFIGFS_FS + help + This allows configuring various IIO bits through configfs + (e.g. software triggers). For more info see + Documentation/iio/iio_configfs.txt. + if IIO_BUFFER config IIO_BUFFER_CB diff --git a/drivers/iio/Makefile b/drivers/iio/Makefile index df87975..31aead3 100644 --- a/drivers/iio/Makefile +++ b/drivers/iio/Makefile @@ -10,6 +10,7 @@ industrialio-$(CONFIG_IIO_SW_TRIGGER) += industrialio-sw-trigger.o industrialio-$(CONFIG_IIO_BUFFER_CB) += buffer_cb.o obj-$(CONFIG_IIO_TRIGGERED_BUFFER) += industrialio-triggered-buffer.o +obj-$(CONFIG_IIO_CONFIGFS) += industrialio-configfs.o obj-$(CONFIG_IIO_KFIFO_BUF) += kfifo_buf.o obj-y += accel/ diff --git a/drivers/iio/industrialio-configfs.c b/drivers/iio/industrialio-configfs.c new file mode 100644 index 0000000..0361434 --- /dev/null +++ b/drivers/iio/industrialio-configfs.c @@ -0,0 +1,117 @@ +/* + * Industrial I/O configfs bits + * + * Copyright (c) 2015 Intel Corporation + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + */ + +#include +#include +#include +#include +#include + +#include +#include + +#define MAX_NAME_LEN 32 + +static struct config_group *trigger_make_group(struct config_group *group, + const char *name) +{ + char *type_name; + char *trigger_name; + char buf[MAX_NAME_LEN]; + struct iio_sw_trigger *t; + + snprintf(buf, MAX_NAME_LEN, "%s", name); + + /* group name should have the form - */ + type_name = buf; + trigger_name = strchr(buf, '-'); + if (!trigger_name) { + pr_err("Unable to locate '-' in %s. Use -.\n", buf); + return ERR_PTR(-EINVAL); + } + + /* replace - with \0, this nicely separates the two strings */ + *trigger_name = '\0'; + trigger_name++; + + t = iio_sw_trigger_create(type_name, trigger_name); + if (IS_ERR(t)) + return ERR_CAST(t); + + config_item_set_name(&t->group.cg_item, name); + + return &t->group; +} + +static void trigger_drop_group(struct config_group *group, + struct config_item *item) +{ + struct iio_sw_trigger *t = to_iio_sw_trigger(item); + + if (t) + iio_sw_trigger_destroy(t); + config_item_put(item); +} + +static struct configfs_group_operations triggers_ops = { + .make_group = &trigger_make_group, + .drop_item = &trigger_drop_group, +}; + +static struct config_item_type iio_triggers_group_type = { + .ct_group_ops = &triggers_ops, + .ct_owner = THIS_MODULE, +}; + +static struct config_group iio_triggers_group = { + .cg_item = { + .ci_namebuf = "triggers", + .ci_type = &iio_triggers_group_type, + }, +}; + +static struct config_group *iio_root_default_groups[] = { + &iio_triggers_group, + NULL +}; + +static struct config_item_type iio_root_group_type = { + .ct_owner = THIS_MODULE, +}; + +static struct configfs_subsystem iio_configfs_subsys = { + .su_group = { + .cg_item = { + .ci_namebuf = "iio", + .ci_type = &iio_root_group_type, + }, + .default_groups = iio_root_default_groups, + }, + .su_mutex = __MUTEX_INITIALIZER(iio_configfs_subsys.su_mutex), +}; + +static int __init iio_configfs_init(void) +{ + config_group_init(&iio_triggers_group); + config_group_init(&iio_configfs_subsys.su_group); + + return configfs_register_subsystem(&iio_configfs_subsys); +} +module_init(iio_configfs_init); + +static void __exit iio_configfs_exit(void) +{ + configfs_unregister_subsystem(&iio_configfs_subsys); +} +module_exit(iio_configfs_exit); + +MODULE_AUTHOR("Daniel Baluta "); +MODULE_DESCRIPTION("Industrial I/O configfs support"); +MODULE_LICENSE("GPL v2"); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/