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