1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Common library for ADIS16XXX devices 4 * 5 * Copyright 2012 Analog Devices Inc. 6 * Author: Lars-Peter Clausen <lars@metafoo.de> 7 */ 8 9 #include <linux/interrupt.h> 10 #include <linux/kernel.h> 11 #include <linux/spi/spi.h> 12 #include <linux/export.h> 13 14 #include <linux/iio/iio.h> 15 #include <linux/iio/trigger.h> 16 #include <linux/iio/imu/adis.h> 17 18 static int adis_data_rdy_trigger_set_state(struct iio_trigger *trig, bool state) 19 { 20 struct adis *adis = iio_trigger_get_drvdata(trig); 21 22 return adis_enable_irq(adis, state); 23 } 24 25 static const struct iio_trigger_ops adis_trigger_ops = { 26 .set_trigger_state = &adis_data_rdy_trigger_set_state, 27 }; 28 29 static int adis_validate_irq_flag(struct adis *adis) 30 { 31 unsigned long direction = adis->irq_flag & IRQF_TRIGGER_MASK; 32 33 /* We cannot mask the interrupt so ensure it's not enabled at request */ 34 if (adis->data->unmasked_drdy) 35 adis->irq_flag |= IRQF_NO_AUTOEN; 36 /* 37 * Typically this devices have data ready either on the rising edge or 38 * on the falling edge of the data ready pin. This checks enforces that 39 * one of those is set in the drivers... It defaults to 40 * IRQF_TRIGGER_RISING for backward compatibility with devices that 41 * don't support changing the pin polarity. 42 */ 43 if (direction == IRQF_TRIGGER_NONE) { 44 adis->irq_flag |= IRQF_TRIGGER_RISING; 45 return 0; 46 } else if (direction != IRQF_TRIGGER_RISING && 47 direction != IRQF_TRIGGER_FALLING) { 48 dev_err(&adis->spi->dev, "Invalid IRQ mask: %08lx\n", 49 adis->irq_flag); 50 return -EINVAL; 51 } 52 53 return 0; 54 } 55 56 /** 57 * devm_adis_probe_trigger() - Sets up trigger for a managed adis device 58 * @adis: The adis device 59 * @indio_dev: The IIO device 60 * 61 * Returns 0 on success or a negative error code 62 */ 63 int devm_adis_probe_trigger(struct adis *adis, struct iio_dev *indio_dev) 64 { 65 int ret; 66 67 adis->trig = devm_iio_trigger_alloc(&adis->spi->dev, "%s-dev%d", 68 indio_dev->name, 69 iio_device_id(indio_dev)); 70 if (!adis->trig) 71 return -ENOMEM; 72 73 adis->trig->ops = &adis_trigger_ops; 74 iio_trigger_set_drvdata(adis->trig, adis); 75 76 ret = adis_validate_irq_flag(adis); 77 if (ret) 78 return ret; 79 80 ret = devm_request_irq(&adis->spi->dev, adis->spi->irq, 81 &iio_trigger_generic_data_rdy_poll, 82 adis->irq_flag, 83 indio_dev->name, 84 adis->trig); 85 if (ret) 86 return ret; 87 88 return devm_iio_trigger_register(&adis->spi->dev, adis->trig); 89 } 90 EXPORT_SYMBOL_NS_GPL(devm_adis_probe_trigger, IIO_ADISLIB); 91 92