Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755557AbbDTOB7 (ORCPT ); Mon, 20 Apr 2015 10:01:59 -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 S1755198AbbDTOBQ (ORCPT ); Mon, 20 Apr 2015 10:01:16 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.11,609,1422950400"; d="scan'208";a="682778561" 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 3/4] iio: trigger: Introduce IIO hrtimer based trigger Date: Mon, 20 Apr 2015 17:02:42 +0300 Message-Id: <1429538563-23430-4-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: 7637 Lines: 266 This patch registers a new IIO software trigger interrupt source based on high resolution timers. Notice that if configfs is enabled we create sampling_frequency attribute allowing users to change hrtimer period (1/sampling_frequency). The IIO hrtimer trigger has a long history, this patch is based on an older version from Marten and Lars-Peter. Signed-off-by: Marten Svanfeldt Signed-off-by: Lars-Peter Clausen Signed-off-by: Daniel Baluta --- drivers/iio/trigger/Kconfig | 9 ++ drivers/iio/trigger/Makefile | 2 + drivers/iio/trigger/iio-trig-hrtimer.c | 201 +++++++++++++++++++++++++++++++++ 3 files changed, 212 insertions(+) create mode 100644 drivers/iio/trigger/iio-trig-hrtimer.c diff --git a/drivers/iio/trigger/Kconfig b/drivers/iio/trigger/Kconfig index 7999612..454665a 100644 --- a/drivers/iio/trigger/Kconfig +++ b/drivers/iio/trigger/Kconfig @@ -5,6 +5,15 @@ menu "Triggers - standalone" +config IIO_HRTIMER_TRIGGER + tristate "High resolution timer trigger" + select IIO_SW_TRIGGER + help + Provides a frequency based IIO trigger using hrtimers. + + To compile this driver as a module, choose M here: the + module will be called iio-trig-hrtimer. + config IIO_INTERRUPT_TRIGGER tristate "Generic interrupt trigger" help diff --git a/drivers/iio/trigger/Makefile b/drivers/iio/trigger/Makefile index 0694dae..fe06eb5 100644 --- a/drivers/iio/trigger/Makefile +++ b/drivers/iio/trigger/Makefile @@ -3,5 +3,7 @@ # # When adding new entries keep the list in alphabetical order + +obj-$(CONFIG_IIO_HRTIMER_TRIGGER) += iio-trig-hrtimer.o obj-$(CONFIG_IIO_INTERRUPT_TRIGGER) += iio-trig-interrupt.o obj-$(CONFIG_IIO_SYSFS_TRIGGER) += iio-trig-sysfs.o diff --git a/drivers/iio/trigger/iio-trig-hrtimer.c b/drivers/iio/trigger/iio-trig-hrtimer.c new file mode 100644 index 0000000..5077fad --- /dev/null +++ b/drivers/iio/trigger/iio-trig-hrtimer.c @@ -0,0 +1,201 @@ +/** + * The industrial I/O periodic hrtimer trigger driver + * + * Copyright (C) Intuitive Aerial AB + * Written by Marten Svanfeldt, marten@intuitiveaerial.com + * Copyright (C) 2012, Analog Device Inc. + * Author: Lars-Peter Clausen + * 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 + +/* default sampling frequency - 100Hz */ +#define HRTIMER_DEFAULT_SAMPLING_FREQUENCY 100 + +struct iio_hrtimer_info { + struct iio_sw_trigger swt; + struct hrtimer timer; + unsigned long sampling_frequency; + ktime_t period; +}; + +#ifdef CONFIG_CONFIGFS_FS +struct iio_hrtimer_info *to_iio_hrtimer_info(struct config_item *item) +{ + return item ? container_of(to_iio_sw_trigger(item), + struct iio_hrtimer_info, swt) : NULL; +} + +CONFIGFS_ATTR_STRUCT(iio_hrtimer_info); + +#define IIO_HRTIMER_INFO_ATTR(_name, _mode, _show, _store) \ + struct iio_hrtimer_info_attribute iio_hrtimer_attr_##_name = \ + __CONFIGFS_ATTR(_name, _mode, _show, _store) + +static +ssize_t iio_hrtimer_info_show_sampling_frequency(struct iio_hrtimer_info *info, + char *page) +{ + return snprintf(page, PAGE_SIZE, "%lu\n", info->sampling_frequency); +} + +static +ssize_t iio_hrtimer_info_store_sampling_frequency(struct iio_hrtimer_info *info, + const char *page, + size_t count) +{ + unsigned long val; + int ret; + + ret = kstrtoul(page, 10, &val); + if (ret) + return ret; + + if (!val || val > NSEC_PER_SEC) + return -EINVAL; + + info->sampling_frequency = val; + info->period = ktime_set(0, NSEC_PER_SEC / val); + + return count; +} + +IIO_HRTIMER_INFO_ATTR(sampling_frequency, S_IRUGO | S_IWUSR, + iio_hrtimer_info_show_sampling_frequency, + iio_hrtimer_info_store_sampling_frequency); + +static struct configfs_attribute *iio_hrtimer_attrs[] = { + &iio_hrtimer_attr_sampling_frequency.attr, + NULL +}; + +CONFIGFS_ATTR_OPS(iio_hrtimer_info); +static struct configfs_item_operations iio_hrtimer_ops = { + .show_attribute = iio_hrtimer_info_attr_show, + .store_attribute = iio_hrtimer_info_attr_store, +}; + +static struct config_item_type iio_hrtimer_type = { + .ct_item_ops = &iio_hrtimer_ops, + .ct_attrs = iio_hrtimer_attrs, + .ct_owner = THIS_MODULE, +}; + +#endif /* CONFIGFS_FS */ + +static enum hrtimer_restart iio_hrtimer_trig_handler(struct hrtimer *timer) +{ + struct iio_hrtimer_info *info; + + info = container_of(timer, struct iio_hrtimer_info, timer); + + hrtimer_forward_now(timer, info->period); + iio_trigger_poll(info->swt.trigger); + + return HRTIMER_RESTART; +} + +static int iio_trig_hrtimer_set_state(struct iio_trigger *trig, bool state) +{ + struct iio_hrtimer_info *trig_info; + + trig_info = iio_trigger_get_drvdata(trig); + + if (state) + hrtimer_start(&trig_info->timer, trig_info->period, + HRTIMER_MODE_REL); + else + hrtimer_cancel(&trig_info->timer); + + return 0; +} + +static const struct iio_trigger_ops iio_hrtimer_trigger_ops = { + .owner = THIS_MODULE, + .set_trigger_state = iio_trig_hrtimer_set_state, +}; + +static struct iio_sw_trigger *iio_trig_hrtimer_probe(const char *name) +{ + struct iio_hrtimer_info *trig_info; + int ret; + + trig_info = kzalloc(sizeof(*trig_info), GFP_KERNEL); + if (!trig_info) + return ERR_PTR(-ENOMEM); + + trig_info->swt.trigger = iio_trigger_alloc("%s", name); + if (!trig_info->swt.trigger) { + ret = -ENOMEM; + goto err_free_trig_info; + } + + iio_trigger_set_drvdata(trig_info->swt.trigger, trig_info); + trig_info->swt.trigger->ops = &iio_hrtimer_trigger_ops; + + hrtimer_init(&trig_info->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + trig_info->timer.function = iio_hrtimer_trig_handler; + + trig_info->sampling_frequency = HRTIMER_DEFAULT_SAMPLING_FREQUENCY; + trig_info->period = ktime_set(0, NSEC_PER_SEC / + trig_info->sampling_frequency); + + ret = iio_trigger_register(trig_info->swt.trigger); + if (ret) + goto err_free_trigger; +#ifdef CONFIG_CONFIGFS_FS + config_group_init_type_name(&trig_info->swt.group, name, + &iio_hrtimer_type); +#endif + return &trig_info->swt; +err_free_trigger: + iio_trigger_free(trig_info->swt.trigger); +err_free_trig_info: + kfree(trig_info); + + return ERR_PTR(ret); +} + +static int iio_trig_hrtimer_remove(struct iio_sw_trigger *swt) +{ + struct iio_hrtimer_info *trig_info; + + trig_info = iio_trigger_get_drvdata(swt->trigger); + + hrtimer_cancel(&trig_info->timer); + + iio_trigger_unregister(swt->trigger); + iio_trigger_free(swt->trigger); + kfree(trig_info); + + return 0; +} + +struct iio_sw_trigger_ops iio_trig_hrtimer_ops = { + .probe = iio_trig_hrtimer_probe, + .remove = iio_trig_hrtimer_remove, +}; + +struct iio_sw_trigger_type iio_trig_hrtimer = { + .name = "hrtimer", + .owner = THIS_MODULE, + .ops = &iio_trig_hrtimer_ops, +}; + +module_iio_sw_trigger_driver(iio_trig_hrtimer); + +MODULE_AUTHOR("Marten Svanfeldt "); +MODULE_AUTHOR("Daniel Baluta "); +MODULE_DESCRIPTION("Periodic hrtimer trigger for the IIO subsystem"); +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/