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, 19 bool state) 20 { 21 struct adis *adis = iio_trigger_get_drvdata(trig); 22 23 return adis_enable_irq(adis, state); 24 } 25 26 static const struct iio_trigger_ops adis_trigger_ops = { 27 .set_trigger_state = &adis_data_rdy_trigger_set_state, 28 }; 29 30 static int adis_validate_irq_flag(struct adis *adis) 31 { 32 unsigned long direction = adis->irq_flag & IRQF_TRIGGER_MASK; 33 /* 34 * Typically this devices have data ready either on the rising edge or 35 * on the falling edge of the data ready pin. This checks enforces that 36 * one of those is set in the drivers... It defaults to 37 * IRQF_TRIGGER_RISING for backward compatibility with devices that 38 * don't support changing the pin polarity. 39 */ 40 if (direction == IRQF_TRIGGER_NONE) { 41 adis->irq_flag |= IRQF_TRIGGER_RISING; 42 return 0; 43 } else if (direction != IRQF_TRIGGER_RISING && 44 direction != IRQF_TRIGGER_FALLING) { 45 dev_err(&adis->spi->dev, "Invalid IRQ mask: %08lx\n", 46 adis->irq_flag); 47 return -EINVAL; 48 } 49 50 return 0; 51 } 52 53 /** 54 * devm_adis_probe_trigger() - Sets up trigger for a managed adis device 55 * @adis: The adis device 56 * @indio_dev: The IIO device 57 * 58 * Returns 0 on success or a negative error code 59 */ 60 int devm_adis_probe_trigger(struct adis *adis, struct iio_dev *indio_dev) 61 { 62 int ret; 63 64 adis->trig = devm_iio_trigger_alloc(&adis->spi->dev, "%s-dev%d", 65 indio_dev->name, indio_dev->id); 66 if (!adis->trig) 67 return -ENOMEM; 68 69 adis->trig->ops = &adis_trigger_ops; 70 iio_trigger_set_drvdata(adis->trig, adis); 71 72 ret = adis_validate_irq_flag(adis); 73 if (ret) 74 return ret; 75 76 ret = devm_request_irq(&adis->spi->dev, adis->spi->irq, 77 &iio_trigger_generic_data_rdy_poll, 78 adis->irq_flag, 79 indio_dev->name, 80 adis->trig); 81 if (ret) 82 return ret; 83 84 return devm_iio_trigger_register(&adis->spi->dev, adis->trig); 85 } 86 EXPORT_SYMBOL_GPL(devm_adis_probe_trigger); 87 88