projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| ccd2b52f LPC |
1 | /* |
| 2 | * Common library for ADIS16XXX devices | |
| 3 | * | |
| 4 | * Copyright 2012 Analog Devices Inc. | |
| 5 | * Author: Lars-Peter Clausen <lars@metafoo.de> | |
| 6 | * | |
| 7 | * Licensed under the GPL-2 or later. | |
| 8 | */ | |
| 9 | ||
| 10 | #include <linux/interrupt.h> | |
| 11 | #include <linux/kernel.h> | |
| 12 | #include <linux/spi/spi.h> | |
| 13 | #include <linux/export.h> | |
| 14 | ||
| 15 | #include <linux/iio/iio.h> | |
| 16 | #include <linux/iio/trigger.h> | |
| 17 | ||
| 18 | #include "adis.h" | |
| 19 | ||
| 20 | static int adis_data_rdy_trigger_set_state(struct iio_trigger *trig, | |
| 21 | bool state) | |
| 22 | { | |
| 23 | struct adis *adis = trig->private_data; | |
| 24 | ||
| 25 | return adis_enable_irq(adis, state); | |
| 26 | } | |
| 27 | ||
| 28 | static const struct iio_trigger_ops adis_trigger_ops = { | |
| 29 | .owner = THIS_MODULE, | |
| 30 | .set_trigger_state = &adis_data_rdy_trigger_set_state, | |
| 31 | }; | |
| 32 | ||
| 33 | /** | |
| 34 | * adis_probe_trigger() - Sets up trigger for a adis device | |
| 35 | * @adis: The adis device | |
| 36 | * @indio_dev: The IIO device | |
| 37 | * | |
| 38 | * Returns 0 on success or a negative error code | |
| 39 | * | |
| 40 | * adis_remove_trigger() should be used to free the trigger. | |
| 41 | */ | |
| 42 | int adis_probe_trigger(struct adis *adis, struct iio_dev *indio_dev) | |
| 43 | { | |
| 44 | int ret; | |
| 45 | ||
| 46 | adis->trig = iio_trigger_alloc("%s-dev%d", indio_dev->name, | |
| 47 | indio_dev->id); | |
| 48 | if (adis->trig == NULL) | |
| 49 | return -ENOMEM; | |
| 50 | ||
| 51 | ret = request_irq(adis->spi->irq, | |
| 52 | &iio_trigger_generic_data_rdy_poll, | |
| 53 | IRQF_TRIGGER_RISING, | |
| 54 | indio_dev->name, | |
| 55 | adis->trig); | |
| 56 | if (ret) | |
| 57 | goto error_free_trig; | |
| 58 | ||
| 59 | adis->trig->dev.parent = &adis->spi->dev; | |
| 60 | adis->trig->ops = &adis_trigger_ops; | |
| 61 | adis->trig->private_data = adis; | |
| 62 | ret = iio_trigger_register(adis->trig); | |
| 63 | ||
| 64 | indio_dev->trig = adis->trig; | |
| 65 | if (ret) | |
| 66 | goto error_free_irq; | |
| 67 | ||
| 68 | return 0; | |
| 69 | ||
| 70 | error_free_irq: | |
| 71 | free_irq(adis->spi->irq, adis->trig); | |
| 72 | error_free_trig: | |
| 73 | iio_trigger_free(adis->trig); | |
| 74 | return ret; | |
| 75 | } | |
| 76 | EXPORT_SYMBOL_GPL(adis_probe_trigger); | |
| 77 | ||
| 78 | /** | |
| 79 | * adis_remove_trigger() - Remove trigger for a adis devices | |
| 80 | * @adis: The adis device | |
| 81 | * | |
| 82 | * Removes the trigger previously registered with adis_probe_trigger(). | |
| 83 | */ | |
| 84 | void adis_remove_trigger(struct adis *adis) | |
| 85 | { | |
| 86 | iio_trigger_unregister(adis->trig); | |
| 87 | free_irq(adis->spi->irq, adis->trig); | |
| 88 | iio_trigger_free(adis->trig); | |
| 89 | } | |
| 90 | EXPORT_SYMBOL_GPL(adis_remove_trigger); |