174 lines
4 KiB
C
174 lines
4 KiB
C
/*
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* Copyright (C) 2005 by Basler Vision Technologies AG
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* Author: Thomas Koeller <thomas.koeller@baslerweb.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/compiler.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/wait.h>
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#include <linux/poll.h>
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#include <linux/interrupt.h>
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#include <linux/platform_device.h>
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#include <linux/miscdevice.h>
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#include "excite_iodev.h"
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static const struct resource *iodev_get_resource(struct platform_device *, const char *, unsigned int);
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static int __init iodev_probe(struct device *);
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static int __exit iodev_remove(struct device *);
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static int iodev_open(struct inode *, struct file *);
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static int iodev_release(struct inode *, struct file *);
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static ssize_t iodev_read(struct file *, char __user *, size_t s, loff_t *);
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static unsigned int iodev_poll(struct file *, struct poll_table_struct *);
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static irqreturn_t iodev_irqhdl(int, void *);
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static const char iodev_name[] = "iodev";
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static unsigned int iodev_irq;
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static DECLARE_WAIT_QUEUE_HEAD(wq);
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static struct file_operations fops =
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{
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.owner = THIS_MODULE,
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.open = iodev_open,
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.release = iodev_release,
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.read = iodev_read,
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.poll = iodev_poll
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};
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static struct miscdevice miscdev =
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{
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.minor = MISC_DYNAMIC_MINOR,
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.name = iodev_name,
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.fops = &fops
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};
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static struct device_driver iodev_driver =
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{
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.name = (char *) iodev_name,
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.bus = &platform_bus_type,
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.owner = THIS_MODULE,
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.probe = iodev_probe,
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.remove = __exit_p(iodev_remove)
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};
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static const struct resource *
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iodev_get_resource(struct platform_device *pdv, const char *name,
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unsigned int type)
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{
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char buf[80];
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if (snprintf(buf, sizeof buf, "%s_0", name) >= sizeof buf)
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return NULL;
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return platform_get_resource_byname(pdv, type, buf);
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}
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/* No hotplugging on the platform bus - use __init */
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static int __init iodev_probe(struct device *dev)
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{
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struct platform_device * const pdv = to_platform_device(dev);
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const struct resource * const ri =
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iodev_get_resource(pdv, IODEV_RESOURCE_IRQ, IORESOURCE_IRQ);
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if (unlikely(!ri))
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return -ENXIO;
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iodev_irq = ri->start;
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return misc_register(&miscdev);
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}
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static int __exit iodev_remove(struct device *dev)
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{
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return misc_deregister(&miscdev);
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}
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static int iodev_open(struct inode *i, struct file *f)
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{
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return request_irq(iodev_irq, iodev_irqhdl, IRQF_DISABLED,
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iodev_name, &miscdev);
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}
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static int iodev_release(struct inode *i, struct file *f)
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{
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free_irq(iodev_irq, &miscdev);
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return 0;
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}
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static ssize_t
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iodev_read(struct file *f, char __user *d, size_t s, loff_t *o)
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{
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ssize_t ret;
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DEFINE_WAIT(w);
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prepare_to_wait(&wq, &w, TASK_INTERRUPTIBLE);
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if (!signal_pending(current))
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schedule();
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ret = signal_pending(current) ? -ERESTARTSYS : 0;
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finish_wait(&wq, &w);
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return ret;
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}
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static unsigned int iodev_poll(struct file *f, struct poll_table_struct *p)
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{
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poll_wait(f, &wq, p);
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return POLLOUT | POLLWRNORM;
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}
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static irqreturn_t iodev_irqhdl(int irq, void *ctxt)
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{
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wake_up(&wq);
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return IRQ_HANDLED;
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}
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static int __init iodev_init_module(void)
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{
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return driver_register(&iodev_driver);
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}
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static void __exit iodev_cleanup_module(void)
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{
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driver_unregister(&iodev_driver);
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}
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module_init(iodev_init_module);
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module_exit(iodev_cleanup_module);
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MODULE_AUTHOR("Thomas Koeller <thomas.koeller@baslerweb.com>");
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MODULE_DESCRIPTION("Basler eXcite i/o interrupt handler");
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MODULE_VERSION("0.0");
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MODULE_LICENSE("GPL");
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