[linux-block.git] / drivers / iio / trigger / iio-trig-interrupt.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Industrial I/O - generic interrupt based trigger support
 *
 * Copyright (c) 2008-2013 Jonathan Cameron
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/slab.h>

#include <linux/iio/iio.h>
#include <linux/iio/trigger.h>


struct iio_interrupt_trigger_info {
	unsigned int irq;
};

static irqreturn_t iio_interrupt_trigger_poll(int irq, void *private)
{
	iio_trigger_poll(private);
	return IRQ_HANDLED;
}

static const struct iio_trigger_ops iio_interrupt_trigger_ops = {
};

static int iio_interrupt_trigger_probe(struct platform_device *pdev)
{
	struct iio_interrupt_trigger_info *trig_info;
	struct iio_trigger *trig;
	unsigned long irqflags;
	struct resource *irq_res;
	int irq, ret = 0;

	irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);

	if (irq_res == NULL)
		return -ENODEV;

	irqflags = (irq_res->flags & IRQF_TRIGGER_MASK) | IRQF_SHARED;

	irq = irq_res->start;

	trig = iio_trigger_alloc("irqtrig%d", irq);
	if (!trig) {
		ret = -ENOMEM;
		goto error_ret;
	}

	trig_info = kzalloc(sizeof(*trig_info), GFP_KERNEL);
	if (!trig_info) {
		ret = -ENOMEM;
		goto error_free_trigger;
	}
	iio_trigger_set_drvdata(trig, trig_info);
	trig_info->irq = irq;
	trig->ops = &iio_interrupt_trigger_ops;
	ret = request_irq(irq, iio_interrupt_trigger_poll,
			  irqflags, trig->name, trig);
	if (ret) {
		dev_err(&pdev->dev,
			"request IRQ-%d failed", irq);
		goto error_free_trig_info;
	}

	ret = iio_trigger_register(trig);
	if (ret)
		goto error_release_irq;
	platform_set_drvdata(pdev, trig);

	return 0;

/* First clean up the partly allocated trigger */
error_release_irq:
	free_irq(irq, trig);
error_free_trig_info:
	kfree(trig_info);
error_free_trigger:
	iio_trigger_free(trig);
error_ret:
	return ret;
}

static int iio_interrupt_trigger_remove(struct platform_device *pdev)
{
	struct iio_trigger *trig;
	struct iio_interrupt_trigger_info *trig_info;

	trig = platform_get_drvdata(pdev);
	trig_info = iio_trigger_get_drvdata(trig);
	iio_trigger_unregister(trig);
	free_irq(trig_info->irq, trig);
	kfree(trig_info);
	iio_trigger_free(trig);

	return 0;
}

static struct platform_driver iio_interrupt_trigger_driver = {
	.probe = iio_interrupt_trigger_probe,
	.remove = iio_interrupt_trigger_remove,
	.driver = {
		.name = "iio_interrupt_trigger",
	},
};

module_platform_driver(iio_interrupt_trigger_driver);

MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
MODULE_DESCRIPTION("Interrupt trigger for the iio subsystem");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
930bae86	2	/*
d4fd73bf	3	* Industrial I/O - generic interrupt based trigger support
930bae86	4	*
d4fd73bf	5	* Copyright (c) 2008-2013 Jonathan Cameron
930bae86 JC	6	*/
	7
	8	#include <linux/kernel.h>
	9	#include <linux/module.h>
	10	#include <linux/platform_device.h>
	11	#include <linux/interrupt.h>
5a0e3ad6	12	#include <linux/slab.h>
930bae86	13
06458e27 JC	14	#include <linux/iio/iio.h>
06458e27 JC	15	#include <linux/iio/trigger.h>
930bae86	16
930bae86	17
d4fd73bf	18	struct iio_interrupt_trigger_info {
a05d7ce3	19	unsigned int irq;
930bae86	20	};
930bae86	21
d4fd73bf	22	static irqreturn_t iio_interrupt_trigger_poll(int irq, void *private)
930bae86	23	{
398fd22b	24	iio_trigger_poll(private);
930bae86 JC	25	return IRQ_HANDLED;
	26	}
	27
d4fd73bf	28	static const struct iio_trigger_ops iio_interrupt_trigger_ops = {
d29f73db JC	29	};
d29f73db JC	30
d4fd73bf	31	static int iio_interrupt_trigger_probe(struct platform_device *pdev)
930bae86	32	{
d4fd73bf	33	struct iio_interrupt_trigger_info *trig_info;
3c1e02db	34	struct iio_trigger *trig;
a05d7ce3 MH	35	unsigned long irqflags;
a05d7ce3 MH	36	struct resource *irq_res;
3c1e02db	37	int irq, ret = 0;
930bae86	38
3c1e02db JC	39	irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	40
	41	if (irq_res == NULL)
	42	return -ENODEV;
	43
	44	irqflags = (irq_res->flags & IRQF_TRIGGER_MASK) \| IRQF_SHARED;
	45
	46	irq = irq_res->start;
	47
78f304d0	48	trig = iio_trigger_alloc("irqtrig%d", irq);
3c1e02db JC	49	if (!trig) {
	50	ret = -ENOMEM;
	51	goto error_ret;
	52	}
	53
	54	trig_info = kzalloc(sizeof(*trig_info), GFP_KERNEL);
	55	if (!trig_info) {
	56	ret = -ENOMEM;
10e840df	57	goto error_free_trigger;
3c1e02db JC	58	}
	59	iio_trigger_set_drvdata(trig, trig_info);
	60	trig_info->irq = irq;
	61	trig->ops = &iio_interrupt_trigger_ops;
	62	ret = request_irq(irq, iio_interrupt_trigger_poll,
	63	irqflags, trig->name, trig);
	64	if (ret) {
	65	dev_err(&pdev->dev,
	66	"request IRQ-%d failed", irq);
	67	goto error_free_trig_info;
	68	}
	69
	70	ret = iio_trigger_register(trig);
	71	if (ret)
	72	goto error_release_irq;
	73	platform_set_drvdata(pdev, trig);
930bae86	74
930bae86 JC	75	return 0;
	76
	77	/* First clean up the partly allocated trigger */
	78	error_release_irq:
	79	free_irq(irq, trig);
930bae86 JC	80	error_free_trig_info:
930bae86 JC	81	kfree(trig_info);
10e840df AS	82	error_free_trigger:
10e840df AS	83	iio_trigger_free(trig);
3c1e02db	84	error_ret:
930bae86 JC	85	return ret;
	86	}
	87
d4fd73bf	88	static int iio_interrupt_trigger_remove(struct platform_device *pdev)
930bae86	89	{
3c1e02db	90	struct iio_trigger *trig;
d4fd73bf	91	struct iio_interrupt_trigger_info *trig_info;
930bae86	92
3c1e02db JC	93	trig = platform_get_drvdata(pdev);
	94	trig_info = iio_trigger_get_drvdata(trig);
	95	iio_trigger_unregister(trig);
	96	free_irq(trig_info->irq, trig);
	97	kfree(trig_info);
10e840df	98	iio_trigger_free(trig);
930bae86 JC	99
	100	return 0;
	101	}
	102
d4fd73bf JC	103	static struct platform_driver iio_interrupt_trigger_driver = {
	104	.probe = iio_interrupt_trigger_probe,
	105	.remove = iio_interrupt_trigger_remove,
930bae86	106	.driver = {
d4fd73bf	107	.name = "iio_interrupt_trigger",
930bae86 JC	108	},
	109	};
	110
d4fd73bf	111	module_platform_driver(iio_interrupt_trigger_driver);
930bae86	112
0f8c9620	113	MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
d4fd73bf	114	MODULE_DESCRIPTION("Interrupt trigger for the iio subsystem");
930bae86	115	MODULE_LICENSE("GPL v2");