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Diffstat (limited to 'arch/mips/basler/excite/excite_iodev.c')
-rw-r--r--arch/mips/basler/excite/excite_iodev.c183
1 files changed, 183 insertions, 0 deletions
diff --git a/arch/mips/basler/excite/excite_iodev.c b/arch/mips/basler/excite/excite_iodev.c
new file mode 100644
index 000000000000..91121e523043
--- /dev/null
+++ b/arch/mips/basler/excite/excite_iodev.c
@@ -0,0 +1,183 @@
+/*
+ * 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/config.h>
+#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, SA_INTERRUPT,
+ 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");