Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753304AbbEDKt3 (ORCPT ); Mon, 4 May 2015 06:49:29 -0400 Received: from mga03.intel.com ([134.134.136.65]:42136 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752775AbbEDKsD (ORCPT ); Mon, 4 May 2015 06:48:03 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.13,366,1427785200"; d="scan'208";a="720245264" 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, daniel.baluta@intel.com Subject: [PATCH v5 1/4] iio: core: Introduce IIO software triggers Date: Mon, 4 May 2015 13:50:01 +0300 Message-Id: <1430736604-22119-2-git-send-email-daniel.baluta@intel.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1430736604-22119-1-git-send-email-daniel.baluta@intel.com> References: <1430736604-22119-1-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: 6975 Lines: 243 A software trigger associates an IIO device trigger with a software interrupt source (e.g: timer, sysfs). This patch adds the generic infrastructure for handling software triggers. Software interrupts sources are kept in a iio_trigger_types_list and registered separately when the associated kernel module is loaded. Software triggers can be created directly from drivers or from user space via configfs interface. Signed-off-by: Daniel Baluta --- drivers/iio/Kconfig | 8 +++ drivers/iio/Makefile | 1 + drivers/iio/industrialio-sw-trigger.c | 112 ++++++++++++++++++++++++++++++++++ include/linux/iio/sw_trigger.h | 60 ++++++++++++++++++ 4 files changed, 181 insertions(+) create mode 100644 drivers/iio/industrialio-sw-trigger.c create mode 100644 include/linux/iio/sw_trigger.h diff --git a/drivers/iio/Kconfig b/drivers/iio/Kconfig index 4011eff..de7f1d9 100644 --- a/drivers/iio/Kconfig +++ b/drivers/iio/Kconfig @@ -58,6 +58,14 @@ config IIO_CONSUMERS_PER_TRIGGER This value controls the maximum number of consumers that a given trigger may handle. Default is 2. +config IIO_SW_TRIGGER + bool "Enable software triggers support" + depends on IIO_TRIGGER + help + Provides IIO core support for software triggers. A software + trigger can be created via configfs or directly by a driver + using the API provided. + source "drivers/iio/accel/Kconfig" source "drivers/iio/adc/Kconfig" source "drivers/iio/amplifiers/Kconfig" diff --git a/drivers/iio/Makefile b/drivers/iio/Makefile index 698afc2..df87975 100644 --- a/drivers/iio/Makefile +++ b/drivers/iio/Makefile @@ -6,6 +6,7 @@ obj-$(CONFIG_IIO) += industrialio.o industrialio-y := industrialio-core.o industrialio-event.o inkern.o industrialio-$(CONFIG_IIO_BUFFER) += industrialio-buffer.o industrialio-$(CONFIG_IIO_TRIGGER) += industrialio-trigger.o +industrialio-$(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 diff --git a/drivers/iio/industrialio-sw-trigger.c b/drivers/iio/industrialio-sw-trigger.c new file mode 100644 index 0000000..f22aa63 --- /dev/null +++ b/drivers/iio/industrialio-sw-trigger.c @@ -0,0 +1,112 @@ +/* + * The Industrial I/O core, software trigger functions + * + * 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 + +static LIST_HEAD(iio_trigger_types_list); +static DEFINE_RWLOCK(iio_trigger_types_lock); + +static +struct iio_sw_trigger_type *iio_find_sw_trigger_type(char *name, unsigned len) +{ + struct iio_sw_trigger_type *t = NULL, *iter; + + list_for_each_entry(iter, &iio_trigger_types_list, list) + if (!strncmp(iter->name, name, len)) { + t = iter; + break; + } + + return t; +} + +int iio_register_sw_trigger_type(struct iio_sw_trigger_type *t) +{ + struct iio_sw_trigger_type *iter; + int ret = 0; + + write_lock(&iio_trigger_types_lock); + iter = iio_find_sw_trigger_type(t->name, strlen(t->name)); + if (iter) + ret = -EBUSY; + else + list_add_tail(&t->list, &iio_trigger_types_list); + write_unlock(&iio_trigger_types_lock); + + return ret; +} +EXPORT_SYMBOL(iio_register_sw_trigger_type); + +int iio_unregister_sw_trigger_type(struct iio_sw_trigger_type *t) +{ + struct iio_sw_trigger_type *iter; + int ret = 0; + + write_lock(&iio_trigger_types_lock); + iter = iio_find_sw_trigger_type(t->name, strlen(t->name)); + if (!iter) + ret = -EINVAL; + else + list_del(&t->list); + write_unlock(&iio_trigger_types_lock); + + return ret; +} +EXPORT_SYMBOL(iio_unregister_sw_trigger_type); + +static +struct iio_sw_trigger_type *iio_get_sw_trigger_type(char *name) +{ + struct iio_sw_trigger_type *t; + + read_lock(&iio_trigger_types_lock); + t = iio_find_sw_trigger_type(name, strlen(name)); + if (t && !try_module_get(t->owner)) + t = NULL; + read_unlock(&iio_trigger_types_lock); + + return t; +} + +struct iio_sw_trigger *iio_sw_trigger_create(char *type, char *name) +{ + struct iio_sw_trigger *t; + struct iio_sw_trigger_type *tt; + + tt = iio_get_sw_trigger_type(type); + if (!tt) { + pr_err("Invalid trigger type: %s\n", type); + return ERR_PTR(-EINVAL); + } + t = tt->ops->probe(name); + if (IS_ERR(t)) + goto out_module_put; + + return t; +out_module_put: + module_put(tt->owner); + return t; +} +EXPORT_SYMBOL(iio_sw_trigger_create); + +void iio_sw_trigger_destroy(struct iio_sw_trigger *t) +{ + struct iio_sw_trigger_type *tt = t->trigger_type; + + tt->ops->remove(t); + module_put(tt->owner); +} +EXPORT_SYMBOL(iio_sw_trigger_destroy); diff --git a/include/linux/iio/sw_trigger.h b/include/linux/iio/sw_trigger.h new file mode 100644 index 0000000..4b41e3e --- /dev/null +++ b/include/linux/iio/sw_trigger.h @@ -0,0 +1,60 @@ +/* + * Industrial I/O software trigger interface + * + * 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. + */ + +#ifndef __IIO_SW_TRIGGER +#define __IIO_SW_TRIGGER + +#include +#include +#include +#include + +#define module_iio_sw_trigger_driver(__iio_sw_trigger_type) \ + module_driver(__iio_sw_trigger_type, iio_register_sw_trigger_type, \ + iio_unregister_sw_trigger_type) + +struct iio_sw_trigger_ops; + +struct iio_sw_trigger_type { + char *name; + struct module *owner; + struct iio_sw_trigger_ops *ops; + struct list_head list; +}; + +struct iio_sw_trigger { + struct iio_trigger *trigger; + struct iio_sw_trigger_type *trigger_type; +#ifdef CONFIG_CONFIGFS_FS + struct config_group group; +#endif +}; + +struct iio_sw_trigger_ops { + struct iio_sw_trigger* (*probe)(const char *); + int (*remove)(struct iio_sw_trigger *); +}; + +int iio_register_sw_trigger_type(struct iio_sw_trigger_type *); +int iio_unregister_sw_trigger_type(struct iio_sw_trigger_type *); + +struct iio_sw_trigger *iio_sw_trigger_create(char *, char *); +void iio_sw_trigger_destroy(struct iio_sw_trigger *); + +#ifdef CONFIG_CONFIGFS_FS +static inline +struct iio_sw_trigger *to_iio_sw_trigger(struct config_item *item) +{ + return container_of(to_config_group(item), struct iio_sw_trigger, + group); +} +#endif + +#endif /* __IIO_SW_TRIGGER */ -- 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/