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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Industrial I/O - generic interrupt based trigger support4 *5 * Copyright (c) 2008-2013 Jonathan Cameron6 */7 8#include <linux/kernel.h>9#include <linux/module.h>10#include <linux/platform_device.h>11#include <linux/interrupt.h>12#include <linux/slab.h>13 14#include <linux/iio/iio.h>15#include <linux/iio/trigger.h>16 17 18struct iio_interrupt_trigger_info {19 unsigned int irq;20};21 22static irqreturn_t iio_interrupt_trigger_poll(int irq, void *private)23{24 iio_trigger_poll(private);25 return IRQ_HANDLED;26}27 28static int iio_interrupt_trigger_probe(struct platform_device *pdev)29{30 struct iio_interrupt_trigger_info *trig_info;31 struct iio_trigger *trig;32 unsigned long irqflags;33 struct resource *irq_res;34 int irq, ret = 0;35 36 irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);37 38 if (irq_res == NULL)39 return -ENODEV;40 41 irqflags = (irq_res->flags & IRQF_TRIGGER_MASK) | IRQF_SHARED;42 43 irq = irq_res->start;44 45 trig = iio_trigger_alloc(NULL, "irqtrig%d", irq);46 if (!trig) {47 ret = -ENOMEM;48 goto error_ret;49 }50 51 trig_info = kzalloc(sizeof(*trig_info), GFP_KERNEL);52 if (!trig_info) {53 ret = -ENOMEM;54 goto error_free_trigger;55 }56 iio_trigger_set_drvdata(trig, trig_info);57 trig_info->irq = irq;58 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 }65 66 ret = iio_trigger_register(trig);67 if (ret)68 goto error_release_irq;69 platform_set_drvdata(pdev, trig);70 71 return 0;72 73/* First clean up the partly allocated trigger */74error_release_irq:75 free_irq(irq, trig);76error_free_trig_info:77 kfree(trig_info);78error_free_trigger:79 iio_trigger_free(trig);80error_ret:81 return ret;82}83 84static void iio_interrupt_trigger_remove(struct platform_device *pdev)85{86 struct iio_trigger *trig;87 struct iio_interrupt_trigger_info *trig_info;88 89 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);94 iio_trigger_free(trig);95}96 97static struct platform_driver iio_interrupt_trigger_driver = {98 .probe = iio_interrupt_trigger_probe,99 .remove_new = iio_interrupt_trigger_remove,100 .driver = {101 .name = "iio_interrupt_trigger",102 },103};104 105module_platform_driver(iio_interrupt_trigger_driver);106 107MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");108MODULE_DESCRIPTION("Interrupt trigger for the iio subsystem");109MODULE_LICENSE("GPL v2");110