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 adis devices without FIFO have data ready either on the 38 * rising edge or on the falling edge of the data ready pin. 39 * IMU devices with FIFO support have the watermark pin level driven 40 * either high or low when the FIFO is filled with the desired number 41 * of samples. 42 * It defaults to IRQF_TRIGGER_RISING for backward compatibility with 43 * devices that don't support changing the pin polarity. 44 */ 45 if (direction == IRQF_TRIGGER_NONE) { 46 adis->irq_flag |= IRQF_TRIGGER_RISING; 47 return 0; 48 } else if (direction != IRQF_TRIGGER_RISING && 49 direction != IRQF_TRIGGER_FALLING && !adis->data->has_fifo) { 50 dev_err(&adis->spi->dev, "Invalid IRQ mask: %08lx\n", 51 adis->irq_flag); 52 return -EINVAL; 53 } else if (direction != IRQF_TRIGGER_HIGH && 54 direction != IRQF_TRIGGER_LOW && adis->data->has_fifo) { 55 dev_err(&adis->spi->dev, "Invalid IRQ mask: %08lx\n", 56 adis->irq_flag); 57 return -EINVAL; 58 } 59 60 return 0; 61 } 62 63 /** 64 * devm_adis_probe_trigger() - Sets up trigger for a managed adis device 65 * @adis: The adis device 66 * @indio_dev: The IIO device 67 * 68 * Returns 0 on success or a negative error code 69 */ 70 int devm_adis_probe_trigger(struct adis *adis, struct iio_dev *indio_dev) 71 { 72 int ret; 73 74 adis->trig = devm_iio_trigger_alloc(&adis->spi->dev, "%s-dev%d", 75 indio_dev->name, 76 iio_device_id(indio_dev)); 77 if (!adis->trig) 78 return -ENOMEM; 79 80 adis->trig->ops = &adis_trigger_ops; 81 iio_trigger_set_drvdata(adis->trig, adis); 82 83 ret = adis_validate_irq_flag(adis); 84 if (ret) 85 return ret; 86 87 if (adis->data->has_fifo) 88 ret = devm_request_threaded_irq(&adis->spi->dev, adis->spi->irq, 89 NULL, 90 &iio_trigger_generic_data_rdy_poll, 91 adis->irq_flag | IRQF_ONESHOT, 92 indio_dev->name, 93 adis->trig); 94 else 95 ret = devm_request_irq(&adis->spi->dev, adis->spi->irq, 96 &iio_trigger_generic_data_rdy_poll, 97 adis->irq_flag, 98 indio_dev->name, 99 adis->trig); 100 if (ret) 101 return ret; 102 103 return devm_iio_trigger_register(&adis->spi->dev, adis->trig); 104 } 105 EXPORT_SYMBOL_NS_GPL(devm_adis_probe_trigger, IIO_ADISLIB); 106 107