1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2015 Cogent Embedded, Inc. 4 */ 5 6 #include <linux/kernel.h> 7 #include <linux/export.h> 8 #include <linux/module.h> 9 #include <linux/iio/iio.h> 10 #include <linux/iio/triggered_event.h> 11 #include <linux/iio/trigger_consumer.h> 12 13 /** 14 * iio_triggered_event_setup() - Setup pollfunc_event for triggered event 15 * @indio_dev: IIO device structure 16 * @h: Function which will be used as pollfunc_event top half 17 * @thread: Function which will be used as pollfunc_event bottom half 18 * 19 * This function combines some common tasks which will normally be performed 20 * when setting up a triggered event. It will allocate the pollfunc_event and 21 * set mode to use it for triggered event. 22 * 23 * Before calling this function the indio_dev structure should already be 24 * completely initialized, but not yet registered. In practice this means that 25 * this function should be called right before iio_device_register(). 26 * 27 * To free the resources allocated by this function call 28 * iio_triggered_event_cleanup(). 29 */ 30 int iio_triggered_event_setup(struct iio_dev *indio_dev, 31 irqreturn_t (*h)(int irq, void *p), 32 irqreturn_t (*thread)(int irq, void *p)) 33 { 34 indio_dev->pollfunc_event = iio_alloc_pollfunc(h, 35 thread, 36 IRQF_ONESHOT, 37 indio_dev, 38 "%s_consumer%d", 39 indio_dev->name, 40 iio_device_id(indio_dev)); 41 if (indio_dev->pollfunc_event == NULL) 42 return -ENOMEM; 43 44 /* Flag that events polling is possible */ 45 indio_dev->modes |= INDIO_EVENT_TRIGGERED; 46 47 return 0; 48 } 49 EXPORT_SYMBOL(iio_triggered_event_setup); 50 51 /** 52 * iio_triggered_event_cleanup() - Free resources allocated by iio_triggered_event_setup() 53 * @indio_dev: IIO device structure 54 */ 55 void iio_triggered_event_cleanup(struct iio_dev *indio_dev) 56 { 57 indio_dev->modes &= ~INDIO_EVENT_TRIGGERED; 58 iio_dealloc_pollfunc(indio_dev->pollfunc_event); 59 } 60 EXPORT_SYMBOL(iio_triggered_event_cleanup); 61 62 MODULE_AUTHOR("Vladimir Barinov"); 63 MODULE_DESCRIPTION("IIO helper functions for setting up triggered events"); 64 MODULE_LICENSE("GPL"); 65