projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 735ad074 VB |
1 | /* |
| 2 | * Copyright (C) 2015 Cogent Embedded, Inc. | |
| 3 | * | |
| 4 | * This program is free software; you can redistribute it and/or modify it | |
| 5 | * under the terms of the GNU General Public License as published by the | |
| 6 | * Free Software Foundation; either version 2 of the License, or (at your | |
| 7 | * option) any later version. | |
| 8 | */ | |
| 9 | ||
| 10 | #include <linux/kernel.h> | |
| 11 | #include <linux/export.h> | |
| 12 | #include <linux/module.h> | |
| 13 | #include <linux/iio/iio.h> | |
| 14 | #include <linux/iio/triggered_event.h> | |
| 15 | #include <linux/iio/trigger_consumer.h> | |
| 16 | ||
| 17 | /** | |
| 18 | * iio_triggered_event_setup() - Setup pollfunc_event for triggered event | |
| 19 | * @indio_dev: IIO device structure | |
| 20 | * @h: Function which will be used as pollfunc_event top half | |
| 21 | * @thread: Function which will be used as pollfunc_event bottom half | |
| 22 | * | |
| 23 | * This function combines some common tasks which will normally be performed | |
| 24 | * when setting up a triggered event. It will allocate the pollfunc_event and | |
| 25 | * set mode to use it for triggered event. | |
| 26 | * | |
| 27 | * Before calling this function the indio_dev structure should already be | |
| 28 | * completely initialized, but not yet registered. In practice this means that | |
| 29 | * this function should be called right before iio_device_register(). | |
| 30 | * | |
| 31 | * To free the resources allocated by this function call | |
| 32 | * iio_triggered_event_cleanup(). | |
| 33 | */ | |
| 34 | int iio_triggered_event_setup(struct iio_dev *indio_dev, | |
| 35 | irqreturn_t (*h)(int irq, void *p), | |
| 36 | irqreturn_t (*thread)(int irq, void *p)) | |
| 37 | { | |
| 38 | indio_dev->pollfunc_event = iio_alloc_pollfunc(h, | |
| 39 | thread, | |
| 40 | IRQF_ONESHOT, | |
| 41 | indio_dev, | |
| 42 | "%s_consumer%d", | |
| 43 | indio_dev->name, | |
| 44 | indio_dev->id); | |
| 45 | if (indio_dev->pollfunc_event == NULL) | |
| 46 | return -ENOMEM; | |
| 47 | ||
| 48 | /* Flag that events polling is possible */ | |
| 49 | indio_dev->modes |= INDIO_EVENT_TRIGGERED; | |
| 50 | ||
| 51 | return 0; | |
| 52 | } | |
| 53 | EXPORT_SYMBOL(iio_triggered_event_setup); | |
| 54 | ||
| 55 | /** | |
| 56 | * iio_triggered_event_cleanup() - Free resources allocated by iio_triggered_event_setup() | |
| 57 | * @indio_dev: IIO device structure | |
| 58 | */ | |
| 59 | void iio_triggered_event_cleanup(struct iio_dev *indio_dev) | |
| 60 | { | |
| 61 | indio_dev->modes &= ~INDIO_EVENT_TRIGGERED; | |
| 62 | iio_dealloc_pollfunc(indio_dev->pollfunc_event); | |
| 63 | } | |
| 64 | EXPORT_SYMBOL(iio_triggered_event_cleanup); | |
| 65 | ||
| 66 | MODULE_AUTHOR("Vladimir Barinov"); | |
| 67 | MODULE_DESCRIPTION("IIO helper functions for setting up triggered events"); | |
| 68 | MODULE_LICENSE("GPL"); |