This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / arch / mips / basler / excite / excite_iodev.c

diff --git a/arch/mips/basler/excite/excite_iodev.c b/arch/mips/basler/excite/excite_iodev.c
new file mode 100644 (file)
index 0000000..10bbb8c
--- /dev/null
+++ b/arch/mips/basler/excite/excite_iodev.c
@@ -0,0 +1,182 @@
+/*
+ *  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");