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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         /* Timestamp not currently provided */
 28         iio_trigger_poll(private, 0);
 29         return IRQ_HANDLED;
 30 }
 31 
 32 static const struct iio_trigger_ops iio_interrupt_trigger_ops = {
 33         .owner = THIS_MODULE,
 34 };
 35 
 36 static int iio_interrupt_trigger_probe(struct platform_device *pdev)
 37 {
 38         struct iio_interrupt_trigger_info *trig_info;
 39         struct iio_trigger *trig;
 40         unsigned long irqflags;
 41         struct resource *irq_res;
 42         int irq, ret = 0;
 43 
 44         irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 45 
 46         if (irq_res == NULL)
 47                 return -ENODEV;
 48 
 49         irqflags = (irq_res->flags & IRQF_TRIGGER_MASK) | IRQF_SHARED;
 50 
 51         irq = irq_res->start;
 52 
 53         trig = iio_trigger_alloc("irqtrig%d", irq);
 54         if (!trig) {
 55                 ret = -ENOMEM;
 56                 goto error_ret;
 57         }
 58 
 59         trig_info = kzalloc(sizeof(*trig_info), GFP_KERNEL);
 60         if (!trig_info) {
 61                 ret = -ENOMEM;
 62                 goto error_put_trigger;
 63         }
 64         iio_trigger_set_drvdata(trig, trig_info);
 65         trig_info->irq = irq;
 66         trig->ops = &iio_interrupt_trigger_ops;
 67         ret = request_irq(irq, iio_interrupt_trigger_poll,
 68                           irqflags, trig->name, trig);
 69         if (ret) {
 70                 dev_err(&pdev->dev,
 71                         "request IRQ-%d failed", irq);
 72                 goto error_free_trig_info;
 73         }
 74 
 75         ret = iio_trigger_register(trig);
 76         if (ret)
 77                 goto error_release_irq;
 78         platform_set_drvdata(pdev, trig);
 79 
 80         return 0;
 81 
 82 /* First clean up the partly allocated trigger */
 83 error_release_irq:
 84         free_irq(irq, trig);
 85 error_free_trig_info:
 86         kfree(trig_info);
 87 error_put_trigger:
 88         iio_trigger_put(trig);
 89 error_ret:
 90         return ret;
 91 }
 92 
 93 static int iio_interrupt_trigger_remove(struct platform_device *pdev)
 94 {
 95         struct iio_trigger *trig;
 96         struct iio_interrupt_trigger_info *trig_info;
 97 
 98         trig = platform_get_drvdata(pdev);
 99         trig_info = iio_trigger_get_drvdata(trig);
100         iio_trigger_unregister(trig);
101         free_irq(trig_info->irq, trig);
102         kfree(trig_info);
103         iio_trigger_put(trig);
104 
105         return 0;
106 }
107 
108 static struct platform_driver iio_interrupt_trigger_driver = {
109         .probe = iio_interrupt_trigger_probe,
110         .remove = iio_interrupt_trigger_remove,
111         .driver = {
112                 .name = "iio_interrupt_trigger",
113                 .owner = THIS_MODULE,
114         },
115 };
116 
117 module_platform_driver(iio_interrupt_trigger_driver);
118 
119 MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
120 MODULE_DESCRIPTION("Interrupt trigger for the iio subsystem");
121 MODULE_LICENSE("GPL v2");
122 

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