patch-2.2.14 linux/drivers/telephony/phonedev.c

• Lines: 168
• Date: Tue Jan 4 10:12:22 2000
• Orig file: v2.2.13/linux/drivers/telephony/phonedev.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.2.13/linux/drivers/telephony/phonedev.c linux/drivers/telephony/phonedev.c
@@ -0,0 +1,167 @@
+/*
+ *            Telephony registration for Linux
+ *
+ *              (c) Copyright 1999 Red Hat Software Inc.
+ *
+ *              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.
+ *
+ * Author:      Alan Cox, <alan@redhat.com>
+ *
+ * Fixes:
+ */
+
+#include <linux/config.h>
+#include <linux/version.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/phonedev.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+
+#include <linux/kmod.h>
+
+
+#define PHONE_NUM_DEVICES	256
+
+/*
+ *    Active devices 
+ */
+
+static struct phone_device *phone_device[PHONE_NUM_DEVICES];
+
+/*
+ *    Open a phone device.
+ */
+
+static int phone_open(struct inode *inode, struct file *file)
+{
+	unsigned int minor = MINOR(inode->i_rdev);
+	int err;
+	struct phone_device *p;
+
+	if (minor >= PHONE_NUM_DEVICES)
+		return -ENODEV;
+
+	p = phone_device[minor];
+	if (p == NULL) {
+		char modname[32];
+
+		sprintf(modname, "char-major-%d-%d", PHONE_MAJOR, minor);
+		request_module(modname);
+		p = phone_device[minor];
+		if (p == NULL)
+			return -ENODEV;
+	}
+	if (p->open) {
+		err = p->open(p, file);	/* Tell the device it is open */
+		if (err)
+			return err;
+	}
+	file->f_op = p->f_op;
+	return 0;
+}
+
+/*
+ *    Telephony For Linux device drivers request registration here.
+ */
+
+int phone_register_device(struct phone_device *p, int unit)
+{
+	int base;
+	int end;
+	int i;
+
+	base = 0;
+	end = PHONE_NUM_DEVICES - 1;
+
+	if (unit != PHONE_UNIT_ANY) {
+		base = unit;
+		end = unit;
+	}
+	for (i = base; i < end; i++) {
+		if (phone_device[i] == NULL) {
+			phone_device[i] = p;
+			p->minor = i;
+			MOD_INC_USE_COUNT;
+			return 0;
+		}
+	}
+	return -ENFILE;
+}
+
+/*
+ *    Unregister an unused Telephony for linux device
+ */
+
+void phone_unregister_device(struct phone_device *pfd)
+{
+	if (phone_device[pfd->minor] != pfd)
+		panic("phone: bad unregister");
+	phone_device[pfd->minor] = NULL;
+	MOD_DEC_USE_COUNT;
+}
+
+
+static struct file_operations phone_fops =
+{
+	NULL,
+	NULL,
+	NULL,
+	NULL,			/* readdir */
+	NULL,
+	NULL,
+	NULL,
+	phone_open,
+	NULL,			/* flush */
+	NULL
+};
+
+/*
+ *	Board init functions
+ */
+ 
+extern int ixj_init(void);
+
+/*
+ *    Initialise Telephony for linux
+ */
+
+int telephony_init(void)
+{
+	printk(KERN_INFO "Linux telephony interface: v1.00\n");
+	if (register_chrdev(PHONE_MAJOR, "telephony", &phone_fops)) {
+		printk("phonedev: unable to get major %d\n", PHONE_MAJOR);
+		return -EIO;
+	}
+	/*
+	 *    Init kernel installed drivers
+	 */
+#ifdef CONFIG_PHONE_IXJ
+	ixj_init();	 
+#endif
+	return 0;
+}
+
+#ifdef MODULE
+int init_module(void)
+{
+	return telephony_init();
+}
+
+void cleanup_module(void)
+{
+	unregister_chrdev(PHONE_MAJOR, "telephony");
+}
+
+#endif
+
+EXPORT_SYMBOL(phone_register_device);
+EXPORT_SYMBOL(phone_unregister_device);