| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame^] | 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 | #include <linux/iio/imu/adis.h> |
| 18 | |
| 19 | static int adis_data_rdy_trigger_set_state(struct iio_trigger *trig, |
| 20 | bool state) |
| 21 | { |
| 22 | struct adis *adis = iio_trigger_get_drvdata(trig); |
| 23 | |
| 24 | return adis_enable_irq(adis, state); |
| 25 | } |
| 26 | |
| 27 | static const struct iio_trigger_ops adis_trigger_ops = { |
| 28 | .set_trigger_state = &adis_data_rdy_trigger_set_state, |
| 29 | }; |
| 30 | |
| 31 | /** |
| 32 | * adis_probe_trigger() - Sets up trigger for a adis device |
| 33 | * @adis: The adis device |
| 34 | * @indio_dev: The IIO device |
| 35 | * |
| 36 | * Returns 0 on success or a negative error code |
| 37 | * |
| 38 | * adis_remove_trigger() should be used to free the trigger. |
| 39 | */ |
| 40 | int adis_probe_trigger(struct adis *adis, struct iio_dev *indio_dev) |
| 41 | { |
| 42 | int ret; |
| 43 | |
| 44 | adis->trig = iio_trigger_alloc("%s-dev%d", indio_dev->name, |
| 45 | indio_dev->id); |
| 46 | if (adis->trig == NULL) |
| 47 | return -ENOMEM; |
| 48 | |
| 49 | adis->trig->dev.parent = &adis->spi->dev; |
| 50 | adis->trig->ops = &adis_trigger_ops; |
| 51 | iio_trigger_set_drvdata(adis->trig, adis); |
| 52 | |
| 53 | ret = request_irq(adis->spi->irq, |
| 54 | &iio_trigger_generic_data_rdy_poll, |
| 55 | IRQF_TRIGGER_RISING, |
| 56 | indio_dev->name, |
| 57 | adis->trig); |
| 58 | if (ret) |
| 59 | goto error_free_trig; |
| 60 | |
| 61 | ret = iio_trigger_register(adis->trig); |
| 62 | |
| 63 | indio_dev->trig = iio_trigger_get(adis->trig); |
| 64 | if (ret) |
| 65 | goto error_free_irq; |
| 66 | |
| 67 | return 0; |
| 68 | |
| 69 | error_free_irq: |
| 70 | free_irq(adis->spi->irq, adis->trig); |
| 71 | error_free_trig: |
| 72 | iio_trigger_free(adis->trig); |
| 73 | return ret; |
| 74 | } |
| 75 | EXPORT_SYMBOL_GPL(adis_probe_trigger); |
| 76 | |
| 77 | /** |
| 78 | * adis_remove_trigger() - Remove trigger for a adis devices |
| 79 | * @adis: The adis device |
| 80 | * |
| 81 | * Removes the trigger previously registered with adis_probe_trigger(). |
| 82 | */ |
| 83 | void adis_remove_trigger(struct adis *adis) |
| 84 | { |
| 85 | iio_trigger_unregister(adis->trig); |
| 86 | free_irq(adis->spi->irq, adis->trig); |
| 87 | iio_trigger_free(adis->trig); |
| 88 | } |
| 89 | EXPORT_SYMBOL_GPL(adis_remove_trigger); |