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-rw-r--r--drivers/isdn/hardware/eicon/divasi.c562
1 files changed, 562 insertions, 0 deletions
diff --git a/drivers/isdn/hardware/eicon/divasi.c b/drivers/isdn/hardware/eicon/divasi.c
new file mode 100644
index 000000000..e7081e0c0
--- /dev/null
+++ b/drivers/isdn/hardware/eicon/divasi.c
@@ -0,0 +1,562 @@
+/* $Id: divasi.c,v 1.25.6.2 2005/01/31 12:22:20 armin Exp $
+ *
+ * Driver for Eicon DIVA Server ISDN cards.
+ * User Mode IDI Interface
+ *
+ * Copyright 2000-2003 by Armin Schindler (mac@melware.de)
+ * Copyright 2000-2003 Cytronics & Melware (info@melware.de)
+ *
+ * This software may be used and distributed according to the terms
+ * of the GNU General Public License, incorporated herein by reference.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/poll.h>
+#include <linux/proc_fs.h>
+#include <linux/skbuff.h>
+#include <linux/seq_file.h>
+#include <linux/uaccess.h>
+
+#include "platform.h"
+#include "di_defs.h"
+#include "divasync.h"
+#include "um_xdi.h"
+#include "um_idi.h"
+
+static char *main_revision = "$Revision: 1.25.6.2 $";
+
+static int major;
+
+MODULE_DESCRIPTION("User IDI Interface for Eicon ISDN cards");
+MODULE_AUTHOR("Cytronics & Melware, Eicon Networks");
+MODULE_SUPPORTED_DEVICE("DIVA card driver");
+MODULE_LICENSE("GPL");
+
+typedef struct _diva_um_idi_os_context {
+ wait_queue_head_t read_wait;
+ wait_queue_head_t close_wait;
+ struct timer_list diva_timer_id;
+ int aborted;
+ int adapter_nr;
+} diva_um_idi_os_context_t;
+
+static char *DRIVERNAME = "Eicon DIVA - User IDI (http://www.melware.net)";
+static char *DRIVERLNAME = "diva_idi";
+static char *DEVNAME = "DivasIDI";
+char *DRIVERRELEASE_IDI = "2.0";
+
+extern int idifunc_init(void);
+extern void idifunc_finit(void);
+
+/*
+ * helper functions
+ */
+static char *getrev(const char *revision)
+{
+ char *rev;
+ char *p;
+ if ((p = strchr(revision, ':'))) {
+ rev = p + 2;
+ p = strchr(rev, '$');
+ *--p = 0;
+ } else
+ rev = "1.0";
+ return rev;
+}
+
+/*
+ * LOCALS
+ */
+static ssize_t um_idi_read(struct file *file, char __user *buf, size_t count,
+ loff_t *offset);
+static ssize_t um_idi_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *offset);
+static __poll_t um_idi_poll(struct file *file, poll_table *wait);
+static int um_idi_open(struct inode *inode, struct file *file);
+static int um_idi_release(struct inode *inode, struct file *file);
+static int remove_entity(void *entity);
+static void diva_um_timer_function(struct timer_list *t);
+
+/*
+ * proc entry
+ */
+extern struct proc_dir_entry *proc_net_eicon;
+static struct proc_dir_entry *um_idi_proc_entry = NULL;
+
+static int um_idi_proc_show(struct seq_file *m, void *v)
+{
+ char tmprev[32];
+
+ seq_printf(m, "%s\n", DRIVERNAME);
+ seq_printf(m, "name : %s\n", DRIVERLNAME);
+ seq_printf(m, "release : %s\n", DRIVERRELEASE_IDI);
+ strcpy(tmprev, main_revision);
+ seq_printf(m, "revision : %s\n", getrev(tmprev));
+ seq_printf(m, "build : %s\n", DIVA_BUILD);
+ seq_printf(m, "major : %d\n", major);
+
+ return 0;
+}
+
+static int __init create_um_idi_proc(void)
+{
+ um_idi_proc_entry = proc_create_single(DRIVERLNAME, S_IRUGO,
+ proc_net_eicon, um_idi_proc_show);
+ if (!um_idi_proc_entry)
+ return (0);
+ return (1);
+}
+
+static void remove_um_idi_proc(void)
+{
+ if (um_idi_proc_entry) {
+ remove_proc_entry(DRIVERLNAME, proc_net_eicon);
+ um_idi_proc_entry = NULL;
+ }
+}
+
+static const struct file_operations divas_idi_fops = {
+ .owner = THIS_MODULE,
+ .llseek = no_llseek,
+ .read = um_idi_read,
+ .write = um_idi_write,
+ .poll = um_idi_poll,
+ .open = um_idi_open,
+ .release = um_idi_release
+};
+
+static void divas_idi_unregister_chrdev(void)
+{
+ unregister_chrdev(major, DEVNAME);
+}
+
+static int __init divas_idi_register_chrdev(void)
+{
+ if ((major = register_chrdev(0, DEVNAME, &divas_idi_fops)) < 0)
+ {
+ printk(KERN_ERR "%s: failed to create /dev entry.\n",
+ DRIVERLNAME);
+ return (0);
+ }
+
+ return (1);
+}
+
+/*
+** Driver Load
+*/
+static int __init divasi_init(void)
+{
+ char tmprev[50];
+ int ret = 0;
+
+ printk(KERN_INFO "%s\n", DRIVERNAME);
+ printk(KERN_INFO "%s: Rel:%s Rev:", DRIVERLNAME, DRIVERRELEASE_IDI);
+ strcpy(tmprev, main_revision);
+ printk("%s Build: %s\n", getrev(tmprev), DIVA_BUILD);
+
+ if (!divas_idi_register_chrdev()) {
+ ret = -EIO;
+ goto out;
+ }
+
+ if (!create_um_idi_proc()) {
+ divas_idi_unregister_chrdev();
+ printk(KERN_ERR "%s: failed to create proc entry.\n",
+ DRIVERLNAME);
+ ret = -EIO;
+ goto out;
+ }
+
+ if (!(idifunc_init())) {
+ remove_um_idi_proc();
+ divas_idi_unregister_chrdev();
+ printk(KERN_ERR "%s: failed to connect to DIDD.\n",
+ DRIVERLNAME);
+ ret = -EIO;
+ goto out;
+ }
+ printk(KERN_INFO "%s: started with major %d\n", DRIVERLNAME, major);
+
+out:
+ return (ret);
+}
+
+
+/*
+** Driver Unload
+*/
+static void __exit divasi_exit(void)
+{
+ idifunc_finit();
+ remove_um_idi_proc();
+ divas_idi_unregister_chrdev();
+
+ printk(KERN_INFO "%s: module unloaded.\n", DRIVERLNAME);
+}
+
+module_init(divasi_init);
+module_exit(divasi_exit);
+
+
+/*
+ * FILE OPERATIONS
+ */
+
+static int
+divas_um_idi_copy_to_user(void *os_handle, void *dst, const void *src,
+ int length)
+{
+ memcpy(dst, src, length);
+ return (length);
+}
+
+static ssize_t
+um_idi_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
+{
+ diva_um_idi_os_context_t *p_os;
+ int ret = -EINVAL;
+ void *data;
+
+ if (!file->private_data) {
+ return (-ENODEV);
+ }
+
+ if (!
+ (p_os =
+ (diva_um_idi_os_context_t *) diva_um_id_get_os_context(file->
+ private_data)))
+ {
+ return (-ENODEV);
+ }
+ if (p_os->aborted) {
+ return (-ENODEV);
+ }
+
+ if (!(data = diva_os_malloc(0, count))) {
+ return (-ENOMEM);
+ }
+
+ ret = diva_um_idi_read(file->private_data,
+ file, data, count,
+ divas_um_idi_copy_to_user);
+ switch (ret) {
+ case 0: /* no message available */
+ ret = (-EAGAIN);
+ break;
+ case (-1): /* adapter was removed */
+ ret = (-ENODEV);
+ break;
+ case (-2): /* message_length > length of user buffer */
+ ret = (-EFAULT);
+ break;
+ }
+
+ if (ret > 0) {
+ if (copy_to_user(buf, data, ret)) {
+ ret = (-EFAULT);
+ }
+ }
+
+ diva_os_free(0, data);
+ DBG_TRC(("read: ret %d", ret));
+ return (ret);
+}
+
+
+static int
+divas_um_idi_copy_from_user(void *os_handle, void *dst, const void *src,
+ int length)
+{
+ memcpy(dst, src, length);
+ return (length);
+}
+
+static int um_idi_open_adapter(struct file *file, int adapter_nr)
+{
+ diva_um_idi_os_context_t *p_os;
+ void *e =
+ divas_um_idi_create_entity((dword) adapter_nr, (void *) file);
+
+ if (!(file->private_data = e)) {
+ return (0);
+ }
+ p_os = (diva_um_idi_os_context_t *) diva_um_id_get_os_context(e);
+ init_waitqueue_head(&p_os->read_wait);
+ init_waitqueue_head(&p_os->close_wait);
+ timer_setup(&p_os->diva_timer_id, diva_um_timer_function, 0);
+ p_os->aborted = 0;
+ p_os->adapter_nr = adapter_nr;
+ return (1);
+}
+
+static ssize_t
+um_idi_write(struct file *file, const char __user *buf, size_t count,
+ loff_t *offset)
+{
+ diva_um_idi_os_context_t *p_os;
+ int ret = -EINVAL;
+ void *data;
+ int adapter_nr = 0;
+
+ if (!file->private_data) {
+ /* the first write() selects the adapter_nr */
+ if (count == sizeof(int)) {
+ if (copy_from_user
+ ((void *) &adapter_nr, buf,
+ count)) return (-EFAULT);
+ if (!(um_idi_open_adapter(file, adapter_nr)))
+ return (-ENODEV);
+ return (count);
+ } else
+ return (-ENODEV);
+ }
+
+ if (!(p_os =
+ (diva_um_idi_os_context_t *) diva_um_id_get_os_context(file->
+ private_data)))
+ {
+ return (-ENODEV);
+ }
+ if (p_os->aborted) {
+ return (-ENODEV);
+ }
+
+ if (!(data = diva_os_malloc(0, count))) {
+ return (-ENOMEM);
+ }
+
+ if (copy_from_user(data, buf, count)) {
+ ret = -EFAULT;
+ } else {
+ ret = diva_um_idi_write(file->private_data,
+ file, data, count,
+ divas_um_idi_copy_from_user);
+ switch (ret) {
+ case 0: /* no space available */
+ ret = (-EAGAIN);
+ break;
+ case (-1): /* adapter was removed */
+ ret = (-ENODEV);
+ break;
+ case (-2): /* length of user buffer > max message_length */
+ ret = (-EFAULT);
+ break;
+ }
+ }
+ diva_os_free(0, data);
+ DBG_TRC(("write: ret %d", ret));
+ return (ret);
+}
+
+static __poll_t um_idi_poll(struct file *file, poll_table *wait)
+{
+ diva_um_idi_os_context_t *p_os;
+
+ if (!file->private_data) {
+ return (EPOLLERR);
+ }
+
+ if ((!(p_os =
+ (diva_um_idi_os_context_t *)
+ diva_um_id_get_os_context(file->private_data)))
+ || p_os->aborted) {
+ return (EPOLLERR);
+ }
+
+ poll_wait(file, &p_os->read_wait, wait);
+
+ if (p_os->aborted) {
+ return (EPOLLERR);
+ }
+
+ switch (diva_user_mode_idi_ind_ready(file->private_data, file)) {
+ case (-1):
+ return (EPOLLERR);
+
+ case 0:
+ return (0);
+ }
+
+ return (EPOLLIN | EPOLLRDNORM);
+}
+
+static int um_idi_open(struct inode *inode, struct file *file)
+{
+ return (0);
+}
+
+
+static int um_idi_release(struct inode *inode, struct file *file)
+{
+ diva_um_idi_os_context_t *p_os;
+ unsigned int adapter_nr;
+ int ret = 0;
+
+ if (!(file->private_data)) {
+ ret = -ENODEV;
+ goto out;
+ }
+
+ if (!(p_os =
+ (diva_um_idi_os_context_t *) diva_um_id_get_os_context(file->private_data))) {
+ ret = -ENODEV;
+ goto out;
+ }
+
+ adapter_nr = p_os->adapter_nr;
+
+ if ((ret = remove_entity(file->private_data))) {
+ goto out;
+ }
+
+ if (divas_um_idi_delete_entity
+ ((int) adapter_nr, file->private_data)) {
+ ret = -ENODEV;
+ goto out;
+ }
+
+out:
+ return (ret);
+}
+
+int diva_os_get_context_size(void)
+{
+ return (sizeof(diva_um_idi_os_context_t));
+}
+
+void diva_os_wakeup_read(void *os_context)
+{
+ diva_um_idi_os_context_t *p_os =
+ (diva_um_idi_os_context_t *) os_context;
+ wake_up_interruptible(&p_os->read_wait);
+}
+
+void diva_os_wakeup_close(void *os_context)
+{
+ diva_um_idi_os_context_t *p_os =
+ (diva_um_idi_os_context_t *) os_context;
+ wake_up_interruptible(&p_os->close_wait);
+}
+
+static
+void diva_um_timer_function(struct timer_list *t)
+{
+ diva_um_idi_os_context_t *p_os = from_timer(p_os, t, diva_timer_id);
+
+ p_os->aborted = 1;
+ wake_up_interruptible(&p_os->read_wait);
+ wake_up_interruptible(&p_os->close_wait);
+ DBG_ERR(("entity removal watchdog"))
+ }
+
+/*
+** If application exits without entity removal this function will remove
+** entity and block until removal is complete
+*/
+static int remove_entity(void *entity)
+{
+ struct task_struct *curtask = current;
+ diva_um_idi_os_context_t *p_os;
+
+ diva_um_idi_stop_wdog(entity);
+
+ if (!entity) {
+ DBG_FTL(("Zero entity on remove"))
+ return (0);
+ }
+
+ if (!(p_os =
+ (diva_um_idi_os_context_t *)
+ diva_um_id_get_os_context(entity))) {
+ DBG_FTL(("Zero entity os context on remove"))
+ return (0);
+ }
+
+ if (!divas_um_idi_entity_assigned(entity) || p_os->aborted) {
+ /*
+ Entity is not assigned, also can be removed
+ */
+ return (0);
+ }
+
+ DBG_TRC(("E(%08x) check remove", entity))
+
+ /*
+ If adapter not answers on remove request inside of
+ 10 Sec, then adapter is dead
+ */
+ diva_um_idi_start_wdog(entity);
+
+ {
+ DECLARE_WAITQUEUE(wait, curtask);
+
+ add_wait_queue(&p_os->close_wait, &wait);
+ for (;;) {
+ set_current_state(TASK_INTERRUPTIBLE);
+ if (!divas_um_idi_entity_start_remove(entity)
+ || p_os->aborted) {
+ break;
+ }
+ schedule();
+ }
+ set_current_state(TASK_RUNNING);
+ remove_wait_queue(&p_os->close_wait, &wait);
+ }
+
+ DBG_TRC(("E(%08x) start remove", entity))
+ {
+ DECLARE_WAITQUEUE(wait, curtask);
+
+ add_wait_queue(&p_os->close_wait, &wait);
+ for (;;) {
+ set_current_state(TASK_INTERRUPTIBLE);
+ if (!divas_um_idi_entity_assigned(entity)
+ || p_os->aborted) {
+ break;
+ }
+ schedule();
+ }
+ set_current_state(TASK_RUNNING);
+ remove_wait_queue(&p_os->close_wait, &wait);
+ }
+
+ DBG_TRC(("E(%08x) remove complete, aborted:%d", entity,
+ p_os->aborted))
+
+ diva_um_idi_stop_wdog(entity);
+
+ p_os->aborted = 0;
+
+ return (0);
+}
+
+/*
+ * timer watchdog
+ */
+void diva_um_idi_start_wdog(void *entity)
+{
+ diva_um_idi_os_context_t *p_os;
+
+ if (entity &&
+ ((p_os =
+ (diva_um_idi_os_context_t *)
+ diva_um_id_get_os_context(entity)))) {
+ mod_timer(&p_os->diva_timer_id, jiffies + 10 * HZ);
+ }
+}
+
+void diva_um_idi_stop_wdog(void *entity)
+{
+ diva_um_idi_os_context_t *p_os;
+
+ if (entity &&
+ ((p_os =
+ (diva_um_idi_os_context_t *)
+ diva_um_id_get_os_context(entity)))) {
+ del_timer(&p_os->diva_timer_id);
+ }
+}
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