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Thomas Gleixnerd2912cb2019-06-04 10:11:33 +02001// SPDX-License-Identifier: GPL-2.0-only
Jonathan Cameron930bae82009-08-18 18:06:31 +01002/*
Jonathan Camerond4fd73b2013-06-02 20:00:00 +01003 * Industrial I/O - generic interrupt based trigger support
Jonathan Cameron930bae82009-08-18 18:06:31 +01004 *
Jonathan Camerond4fd73b2013-06-02 20:00:00 +01005 * Copyright (c) 2008-2013 Jonathan Cameron
Jonathan Cameron930bae82009-08-18 18:06:31 +01006 */
7
8#include <linux/kernel.h>
9#include <linux/module.h>
10#include <linux/platform_device.h>
11#include <linux/interrupt.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090012#include <linux/slab.h>
Jonathan Cameron930bae82009-08-18 18:06:31 +010013
Jonathan Cameron06458e22012-04-25 15:54:58 +010014#include <linux/iio/iio.h>
15#include <linux/iio/trigger.h>
Jonathan Cameron930bae82009-08-18 18:06:31 +010016
Jonathan Cameron930bae82009-08-18 18:06:31 +010017
Jonathan Camerond4fd73b2013-06-02 20:00:00 +010018struct iio_interrupt_trigger_info {
Michael Hennericha05d7ce2010-04-26 10:36:36 +020019 unsigned int irq;
Jonathan Cameron930bae82009-08-18 18:06:31 +010020};
Jonathan Cameron930bae82009-08-18 18:06:31 +010021
Jonathan Camerond4fd73b2013-06-02 20:00:00 +010022static irqreturn_t iio_interrupt_trigger_poll(int irq, void *private)
Jonathan Cameron930bae82009-08-18 18:06:31 +010023{
Peter Meerwald398fd222014-12-06 06:46:00 +000024 iio_trigger_poll(private);
Jonathan Cameron930bae82009-08-18 18:06:31 +010025 return IRQ_HANDLED;
26}
27
Jonathan Camerond4fd73b2013-06-02 20:00:00 +010028static int iio_interrupt_trigger_probe(struct platform_device *pdev)
Jonathan Cameron930bae82009-08-18 18:06:31 +010029{
Jonathan Camerond4fd73b2013-06-02 20:00:00 +010030 struct iio_interrupt_trigger_info *trig_info;
Jonathan Cameron3c1e02d2013-06-02 20:00:00 +010031 struct iio_trigger *trig;
Michael Hennericha05d7ce2010-04-26 10:36:36 +020032 unsigned long irqflags;
33 struct resource *irq_res;
Jonathan Cameron3c1e02d2013-06-02 20:00:00 +010034 int irq, ret = 0;
Michael Hennericha05d7ce2010-04-26 10:36:36 +020035
Jonathan Cameron3c1e02d2013-06-02 20:00:00 +010036 irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
Michael Hennericha05d7ce2010-04-26 10:36:36 +020037
Jonathan Cameron3c1e02d2013-06-02 20:00:00 +010038 if (irq_res == NULL)
39 return -ENODEV;
Michael Hennericha05d7ce2010-04-26 10:36:36 +020040
Jonathan Cameron3c1e02d2013-06-02 20:00:00 +010041 irqflags = (irq_res->flags & IRQF_TRIGGER_MASK) | IRQF_SHARED;
Michael Hennericha05d7ce2010-04-26 10:36:36 +020042
Jonathan Cameron3c1e02d2013-06-02 20:00:00 +010043 irq = irq_res->start;
Michael Hennericha05d7ce2010-04-26 10:36:36 +020044
Gwendal Grignou995071d2021-03-09 11:36:13 -080045 trig = iio_trigger_alloc(NULL, "irqtrig%d", irq);
Jonathan Cameron3c1e02d2013-06-02 20:00:00 +010046 if (!trig) {
47 ret = -ENOMEM;
48 goto error_ret;
49 }
Michael Hennericha05d7ce2010-04-26 10:36:36 +020050
Jonathan Cameron3c1e02d2013-06-02 20:00:00 +010051 trig_info = kzalloc(sizeof(*trig_info), GFP_KERNEL);
52 if (!trig_info) {
53 ret = -ENOMEM;
Alison Schofield10e840d2017-01-19 19:47:38 -080054 goto error_free_trigger;
Jonathan Cameron3c1e02d2013-06-02 20:00:00 +010055 }
56 iio_trigger_set_drvdata(trig, trig_info);
57 trig_info->irq = irq;
Jonathan Cameron3c1e02d2013-06-02 20:00:00 +010058 ret = request_irq(irq, iio_interrupt_trigger_poll,
59 irqflags, trig->name, trig);
60 if (ret) {
61 dev_err(&pdev->dev,
62 "request IRQ-%d failed", irq);
63 goto error_free_trig_info;
64 }
Michael Hennericha05d7ce2010-04-26 10:36:36 +020065
Jonathan Cameron3c1e02d2013-06-02 20:00:00 +010066 ret = iio_trigger_register(trig);
67 if (ret)
68 goto error_release_irq;
69 platform_set_drvdata(pdev, trig);
Jonathan Cameron930bae82009-08-18 18:06:31 +010070
Jonathan Cameron930bae82009-08-18 18:06:31 +010071 return 0;
72
73/* First clean up the partly allocated trigger */
74error_release_irq:
75 free_irq(irq, trig);
Jonathan Cameron930bae82009-08-18 18:06:31 +010076error_free_trig_info:
77 kfree(trig_info);
Alison Schofield10e840d2017-01-19 19:47:38 -080078error_free_trigger:
79 iio_trigger_free(trig);
Jonathan Cameron3c1e02d2013-06-02 20:00:00 +010080error_ret:
Jonathan Cameron930bae82009-08-18 18:06:31 +010081 return ret;
82}
83
Jonathan Camerond4fd73b2013-06-02 20:00:00 +010084static int iio_interrupt_trigger_remove(struct platform_device *pdev)
Jonathan Cameron930bae82009-08-18 18:06:31 +010085{
Jonathan Cameron3c1e02d2013-06-02 20:00:00 +010086 struct iio_trigger *trig;
Jonathan Camerond4fd73b2013-06-02 20:00:00 +010087 struct iio_interrupt_trigger_info *trig_info;
Jonathan Cameron930bae82009-08-18 18:06:31 +010088
Jonathan Cameron3c1e02d2013-06-02 20:00:00 +010089 trig = platform_get_drvdata(pdev);
90 trig_info = iio_trigger_get_drvdata(trig);
91 iio_trigger_unregister(trig);
92 free_irq(trig_info->irq, trig);
93 kfree(trig_info);
Alison Schofield10e840d2017-01-19 19:47:38 -080094 iio_trigger_free(trig);
Jonathan Cameron930bae82009-08-18 18:06:31 +010095
96 return 0;
97}
98
Jonathan Camerond4fd73b2013-06-02 20:00:00 +010099static struct platform_driver iio_interrupt_trigger_driver = {
100 .probe = iio_interrupt_trigger_probe,
101 .remove = iio_interrupt_trigger_remove,
Jonathan Cameron930bae82009-08-18 18:06:31 +0100102 .driver = {
Jonathan Camerond4fd73b2013-06-02 20:00:00 +0100103 .name = "iio_interrupt_trigger",
Jonathan Cameron930bae82009-08-18 18:06:31 +0100104 },
105};
106
Jonathan Camerond4fd73b2013-06-02 20:00:00 +0100107module_platform_driver(iio_interrupt_trigger_driver);
Jonathan Cameron930bae82009-08-18 18:06:31 +0100108
Jonathan Cameron0f8c9622012-09-02 21:34:59 +0100109MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
Jonathan Camerond4fd73b2013-06-02 20:00:00 +0100110MODULE_DESCRIPTION("Interrupt trigger for the iio subsystem");
Jonathan Cameron930bae82009-08-18 18:06:31 +0100111MODULE_LICENSE("GPL v2");