add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/iio/imu/adis_trigger.c
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@@ -1,10 +1,9 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  * Common library for ADIS16XXX devices
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  *
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  * Copyright 2012 Analog Devices Inc.
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  *   Author: Lars-Peter Clausen <lars@metafoo.de>
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- *
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- * Licensed under the GPL-2 or later.
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  */
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 #include <linux/interrupt.h>
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@@ -16,8 +15,7 @@
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 #include <linux/iio/trigger.h>
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 #include <linux/iio/imu/adis.h>
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17
 
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-static int adis_data_rdy_trigger_set_state(struct iio_trigger *trig,
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-						bool state)
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+static int adis_data_rdy_trigger_set_state(struct iio_trigger *trig, bool state)
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 {
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 	struct adis *adis = iio_trigger_get_drvdata(trig);
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@@ -28,62 +26,71 @@
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 	.set_trigger_state = &adis_data_rdy_trigger_set_state,
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 };
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+static void adis_trigger_setup(struct adis *adis)
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+{
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+	adis->trig->dev.parent = &adis->spi->dev;
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+	adis->trig->ops = &adis_trigger_ops;
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+	iio_trigger_set_drvdata(adis->trig, adis);
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+}
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+
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+static int adis_validate_irq_flag(struct adis *adis)
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+{
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+	unsigned long direction = adis->irq_flag & IRQF_TRIGGER_MASK;
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+
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+	/* We cannot mask the interrupt so ensure it's not enabled at request */
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+	if (adis->data->unmasked_drdy)
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+		adis->irq_flag |= IRQF_NO_AUTOEN;
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+	/*
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+	 * Typically this devices have data ready either on the rising edge or
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+	 * on the falling edge of the data ready pin. This checks enforces that
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+	 * one of those is set in the drivers... It defaults to
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+	 * IRQF_TRIGGER_RISING for backward compatibility with devices that
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+	 * don't support changing the pin polarity.
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+	 */
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+	if (direction == IRQF_TRIGGER_NONE) {
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+		adis->irq_flag |= IRQF_TRIGGER_RISING;
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+		return 0;
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+	} else if (direction != IRQF_TRIGGER_RISING &&
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+		   direction != IRQF_TRIGGER_FALLING) {
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+		dev_err(&adis->spi->dev, "Invalid IRQ mask: %08lx\n",
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+			adis->irq_flag);
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+		return -EINVAL;
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+	}
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+
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+	return 0;
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+}
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+
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 /**
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- * adis_probe_trigger() - Sets up trigger for a adis device
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+ * devm_adis_probe_trigger() - Sets up trigger for a managed adis device
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  * @adis: The adis device
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  * @indio_dev: The IIO device
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  *
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  * Returns 0 on success or a negative error code
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- *
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- * adis_remove_trigger() should be used to free the trigger.
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  */
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-int adis_probe_trigger(struct adis *adis, struct iio_dev *indio_dev)
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+int devm_adis_probe_trigger(struct adis *adis, struct iio_dev *indio_dev)
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 {
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 	int ret;
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-	adis->trig = iio_trigger_alloc("%s-dev%d", indio_dev->name,
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-					indio_dev->id);
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-	if (adis->trig == NULL)
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+	adis->trig = devm_iio_trigger_alloc(&adis->spi->dev, "%s-dev%d",
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+					    indio_dev->name, indio_dev->id);
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+	if (!adis->trig)
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 		return -ENOMEM;
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-	adis->trig->dev.parent = &adis->spi->dev;
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-	adis->trig->ops = &adis_trigger_ops;
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-	iio_trigger_set_drvdata(adis->trig, adis);
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+	adis_trigger_setup(adis);
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-	ret = request_irq(adis->spi->irq,
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-			  &iio_trigger_generic_data_rdy_poll,
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-			  IRQF_TRIGGER_RISING,
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-			  indio_dev->name,
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-			  adis->trig);
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+	ret = adis_validate_irq_flag(adis);
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 	if (ret)
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-		goto error_free_trig;
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+		return ret;
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-	ret = iio_trigger_register(adis->trig);
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-
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-	indio_dev->trig = iio_trigger_get(adis->trig);
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+	ret = devm_request_irq(&adis->spi->dev, adis->spi->irq,
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+			       &iio_trigger_generic_data_rdy_poll,
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+			       adis->irq_flag,
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+			       indio_dev->name,
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+			       adis->trig);
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 	if (ret)
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-		goto error_free_irq;
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+		return ret;
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-	return 0;
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-
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-error_free_irq:
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-	free_irq(adis->spi->irq, adis->trig);
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-error_free_trig:
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-	iio_trigger_free(adis->trig);
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-	return ret;
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+	return devm_iio_trigger_register(&adis->spi->dev, adis->trig);
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 }
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-EXPORT_SYMBOL_GPL(adis_probe_trigger);
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+EXPORT_SYMBOL_NS_GPL(devm_adis_probe_trigger, IIO_ADISLIB);
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-/**
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- * adis_remove_trigger() - Remove trigger for a adis devices
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- * @adis: The adis device
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- *
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- * Removes the trigger previously registered with adis_probe_trigger().
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- */
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-void adis_remove_trigger(struct adis *adis)
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-{
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-	iio_trigger_unregister(adis->trig);
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-	free_irq(adis->spi->irq, adis->trig);
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-	iio_trigger_free(adis->trig);
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-}
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-EXPORT_SYMBOL_GPL(adis_remove_trigger);