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Linux/drivers/iio/trigger/iio-trig-interrupt.c

  1 /*
  2  * Industrial I/O - generic interrupt based trigger support
  3  *
  4  * Copyright (c) 2008-2013 Jonathan Cameron
  5  *
  6  * This program is free software; you can redistribute it and/or modify it
  7  * under the terms of the GNU General Public License version 2 as published by
  8  * the Free Software Foundation.
  9  */
 10 
 11 #include <linux/kernel.h>
 12 #include <linux/module.h>
 13 #include <linux/platform_device.h>
 14 #include <linux/interrupt.h>
 15 #include <linux/slab.h>
 16 
 17 #include <linux/iio/iio.h>
 18 #include <linux/iio/trigger.h>
 19 
 20 
 21 struct iio_interrupt_trigger_info {
 22         unsigned int irq;
 23 };
 24 
 25 static irqreturn_t iio_interrupt_trigger_poll(int irq, void *private)
 26 {
 27         iio_trigger_poll(private);
 28         return IRQ_HANDLED;
 29 }
 30 
 31 static const struct iio_trigger_ops iio_interrupt_trigger_ops = {
 32         .owner = THIS_MODULE,
 33 };
 34 
 35 static int iio_interrupt_trigger_probe(struct platform_device *pdev)
 36 {
 37         struct iio_interrupt_trigger_info *trig_info;
 38         struct iio_trigger *trig;
 39         unsigned long irqflags;
 40         struct resource *irq_res;
 41         int irq, ret = 0;
 42 
 43         irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 44 
 45         if (irq_res == NULL)
 46                 return -ENODEV;
 47 
 48         irqflags = (irq_res->flags & IRQF_TRIGGER_MASK) | IRQF_SHARED;
 49 
 50         irq = irq_res->start;
 51 
 52         trig = iio_trigger_alloc("irqtrig%d", irq);
 53         if (!trig) {
 54                 ret = -ENOMEM;
 55                 goto error_ret;
 56         }
 57 
 58         trig_info = kzalloc(sizeof(*trig_info), GFP_KERNEL);
 59         if (!trig_info) {
 60                 ret = -ENOMEM;
 61                 goto error_put_trigger;
 62         }
 63         iio_trigger_set_drvdata(trig, trig_info);
 64         trig_info->irq = irq;
 65         trig->ops = &iio_interrupt_trigger_ops;
 66         ret = request_irq(irq, iio_interrupt_trigger_poll,
 67                           irqflags, trig->name, trig);
 68         if (ret) {
 69                 dev_err(&pdev->dev,
 70                         "request IRQ-%d failed", irq);
 71                 goto error_free_trig_info;
 72         }
 73 
 74         ret = iio_trigger_register(trig);
 75         if (ret)
 76                 goto error_release_irq;
 77         platform_set_drvdata(pdev, trig);
 78 
 79         return 0;
 80 
 81 /* First clean up the partly allocated trigger */
 82 error_release_irq:
 83         free_irq(irq, trig);
 84 error_free_trig_info:
 85         kfree(trig_info);
 86 error_put_trigger:
 87         iio_trigger_put(trig);
 88 error_ret:
 89         return ret;
 90 }
 91 
 92 static int iio_interrupt_trigger_remove(struct platform_device *pdev)
 93 {
 94         struct iio_trigger *trig;
 95         struct iio_interrupt_trigger_info *trig_info;
 96 
 97         trig = platform_get_drvdata(pdev);
 98         trig_info = iio_trigger_get_drvdata(trig);
 99         iio_trigger_unregister(trig);
100         free_irq(trig_info->irq, trig);
101         kfree(trig_info);
102         iio_trigger_put(trig);
103 
104         return 0;
105 }
106 
107 static struct platform_driver iio_interrupt_trigger_driver = {
108         .probe = iio_interrupt_trigger_probe,
109         .remove = iio_interrupt_trigger_remove,
110         .driver = {
111                 .name = "iio_interrupt_trigger",
112         },
113 };
114 
115 module_platform_driver(iio_interrupt_trigger_driver);
116 
117 MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
118 MODULE_DESCRIPTION("Interrupt trigger for the iio subsystem");
119 MODULE_LICENSE("GPL v2");
120 

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