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Diffstat (limited to 'drivers/s390/char/fs3270.c')
-rw-r--r--drivers/s390/char/fs3270.c551
1 files changed, 551 insertions, 0 deletions
diff --git a/drivers/s390/char/fs3270.c b/drivers/s390/char/fs3270.c
new file mode 100644
index 00000000000..911704571b9
--- /dev/null
+++ b/drivers/s390/char/fs3270.c
@@ -0,0 +1,551 @@
+/*
+ * IBM/3270 Driver - fullscreen driver.
+ *
+ * Author(s):
+ * Original 3270 Code for 2.4 written by Richard Hitt (UTS Global)
+ * Rewritten for 2.5/2.6 by Martin Schwidefsky <schwidefsky@de.ibm.com>
+ * Copyright IBM Corp. 2003, 2009
+ */
+
+#include <linux/bootmem.h>
+#include <linux/console.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/compat.h>
+#include <linux/module.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+
+#include <asm/compat.h>
+#include <asm/ccwdev.h>
+#include <asm/cio.h>
+#include <asm/ebcdic.h>
+#include <asm/idals.h>
+
+#include "raw3270.h"
+#include "ctrlchar.h"
+
+static struct raw3270_fn fs3270_fn;
+
+struct fs3270 {
+ struct raw3270_view view;
+ struct pid *fs_pid; /* Pid of controlling program. */
+ int read_command; /* ccw command to use for reads. */
+ int write_command; /* ccw command to use for writes. */
+ int attention; /* Got attention. */
+ int active; /* Fullscreen view is active. */
+ struct raw3270_request *init; /* single init request. */
+ wait_queue_head_t wait; /* Init & attention wait queue. */
+ struct idal_buffer *rdbuf; /* full-screen-deactivate buffer */
+ size_t rdbuf_size; /* size of data returned by RDBUF */
+};
+
+static DEFINE_MUTEX(fs3270_mutex);
+
+static void
+fs3270_wake_up(struct raw3270_request *rq, void *data)
+{
+ wake_up((wait_queue_head_t *) data);
+}
+
+static inline int
+fs3270_working(struct fs3270 *fp)
+{
+ /*
+ * The fullscreen view is in working order if the view
+ * has been activated AND the initial request is finished.
+ */
+ return fp->active && raw3270_request_final(fp->init);
+}
+
+static int
+fs3270_do_io(struct raw3270_view *view, struct raw3270_request *rq)
+{
+ struct fs3270 *fp;
+ int rc;
+
+ fp = (struct fs3270 *) view;
+ rq->callback = fs3270_wake_up;
+ rq->callback_data = &fp->wait;
+
+ do {
+ if (!fs3270_working(fp)) {
+ /* Fullscreen view isn't ready yet. */
+ rc = wait_event_interruptible(fp->wait,
+ fs3270_working(fp));
+ if (rc != 0)
+ break;
+ }
+ rc = raw3270_start(view, rq);
+ if (rc == 0) {
+ /* Started successfully. Now wait for completion. */
+ wait_event(fp->wait, raw3270_request_final(rq));
+ }
+ } while (rc == -EACCES);
+ return rc;
+}
+
+/*
+ * Switch to the fullscreen view.
+ */
+static void
+fs3270_reset_callback(struct raw3270_request *rq, void *data)
+{
+ struct fs3270 *fp;
+
+ fp = (struct fs3270 *) rq->view;
+ raw3270_request_reset(rq);
+ wake_up(&fp->wait);
+}
+
+static void
+fs3270_restore_callback(struct raw3270_request *rq, void *data)
+{
+ struct fs3270 *fp;
+
+ fp = (struct fs3270 *) rq->view;
+ if (rq->rc != 0 || rq->rescnt != 0) {
+ if (fp->fs_pid)
+ kill_pid(fp->fs_pid, SIGHUP, 1);
+ }
+ fp->rdbuf_size = 0;
+ raw3270_request_reset(rq);
+ wake_up(&fp->wait);
+}
+
+static int
+fs3270_activate(struct raw3270_view *view)
+{
+ struct fs3270 *fp;
+ char *cp;
+ int rc;
+
+ fp = (struct fs3270 *) view;
+
+ /* If an old init command is still running just return. */
+ if (!raw3270_request_final(fp->init))
+ return 0;
+
+ if (fp->rdbuf_size == 0) {
+ /* No saved buffer. Just clear the screen. */
+ raw3270_request_set_cmd(fp->init, TC_EWRITEA);
+ fp->init->callback = fs3270_reset_callback;
+ } else {
+ /* Restore fullscreen buffer saved by fs3270_deactivate. */
+ raw3270_request_set_cmd(fp->init, TC_EWRITEA);
+ raw3270_request_set_idal(fp->init, fp->rdbuf);
+ fp->init->ccw.count = fp->rdbuf_size;
+ cp = fp->rdbuf->data[0];
+ cp[0] = TW_KR;
+ cp[1] = TO_SBA;
+ cp[2] = cp[6];
+ cp[3] = cp[7];
+ cp[4] = TO_IC;
+ cp[5] = TO_SBA;
+ cp[6] = 0x40;
+ cp[7] = 0x40;
+ fp->init->rescnt = 0;
+ fp->init->callback = fs3270_restore_callback;
+ }
+ rc = fp->init->rc = raw3270_start_locked(view, fp->init);
+ if (rc)
+ fp->init->callback(fp->init, NULL);
+ else
+ fp->active = 1;
+ return rc;
+}
+
+/*
+ * Shutdown fullscreen view.
+ */
+static void
+fs3270_save_callback(struct raw3270_request *rq, void *data)
+{
+ struct fs3270 *fp;
+
+ fp = (struct fs3270 *) rq->view;
+
+ /* Correct idal buffer element 0 address. */
+ fp->rdbuf->data[0] -= 5;
+ fp->rdbuf->size += 5;
+
+ /*
+ * If the rdbuf command failed or the idal buffer is
+ * to small for the amount of data returned by the
+ * rdbuf command, then we have no choice but to send
+ * a SIGHUP to the application.
+ */
+ if (rq->rc != 0 || rq->rescnt == 0) {
+ if (fp->fs_pid)
+ kill_pid(fp->fs_pid, SIGHUP, 1);
+ fp->rdbuf_size = 0;
+ } else
+ fp->rdbuf_size = fp->rdbuf->size - rq->rescnt;
+ raw3270_request_reset(rq);
+ wake_up(&fp->wait);
+}
+
+static void
+fs3270_deactivate(struct raw3270_view *view)
+{
+ struct fs3270 *fp;
+
+ fp = (struct fs3270 *) view;
+ fp->active = 0;
+
+ /* If an old init command is still running just return. */
+ if (!raw3270_request_final(fp->init))
+ return;
+
+ /* Prepare read-buffer request. */
+ raw3270_request_set_cmd(fp->init, TC_RDBUF);
+ /*
+ * Hackish: skip first 5 bytes of the idal buffer to make
+ * room for the TW_KR/TO_SBA/<address>/<address>/TO_IC sequence
+ * in the activation command.
+ */
+ fp->rdbuf->data[0] += 5;
+ fp->rdbuf->size -= 5;
+ raw3270_request_set_idal(fp->init, fp->rdbuf);
+ fp->init->rescnt = 0;
+ fp->init->callback = fs3270_save_callback;
+
+ /* Start I/O to read in the 3270 buffer. */
+ fp->init->rc = raw3270_start_locked(view, fp->init);
+ if (fp->init->rc)
+ fp->init->callback(fp->init, NULL);
+}
+
+static int
+fs3270_irq(struct fs3270 *fp, struct raw3270_request *rq, struct irb *irb)
+{
+ /* Handle ATTN. Set indication and wake waiters for attention. */
+ if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
+ fp->attention = 1;
+ wake_up(&fp->wait);
+ }
+
+ if (rq) {
+ if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK)
+ rq->rc = -EIO;
+ else
+ /* Normal end. Copy residual count. */
+ rq->rescnt = irb->scsw.cmd.count;
+ }
+ return RAW3270_IO_DONE;
+}
+
+/*
+ * Process reads from fullscreen 3270.
+ */
+static ssize_t
+fs3270_read(struct file *filp, char __user *data, size_t count, loff_t *off)
+{
+ struct fs3270 *fp;
+ struct raw3270_request *rq;
+ struct idal_buffer *ib;
+ ssize_t rc;
+
+ if (count == 0 || count > 65535)
+ return -EINVAL;
+ fp = filp->private_data;
+ if (!fp)
+ return -ENODEV;
+ ib = idal_buffer_alloc(count, 0);
+ if (IS_ERR(ib))
+ return -ENOMEM;
+ rq = raw3270_request_alloc(0);
+ if (!IS_ERR(rq)) {
+ if (fp->read_command == 0 && fp->write_command != 0)
+ fp->read_command = 6;
+ raw3270_request_set_cmd(rq, fp->read_command ? : 2);
+ raw3270_request_set_idal(rq, ib);
+ rc = wait_event_interruptible(fp->wait, fp->attention);
+ fp->attention = 0;
+ if (rc == 0) {
+ rc = fs3270_do_io(&fp->view, rq);
+ if (rc == 0) {
+ count -= rq->rescnt;
+ if (idal_buffer_to_user(ib, data, count) != 0)
+ rc = -EFAULT;
+ else
+ rc = count;
+
+ }
+ }
+ raw3270_request_free(rq);
+ } else
+ rc = PTR_ERR(rq);
+ idal_buffer_free(ib);
+ return rc;
+}
+
+/*
+ * Process writes to fullscreen 3270.
+ */
+static ssize_t
+fs3270_write(struct file *filp, const char __user *data, size_t count, loff_t *off)
+{
+ struct fs3270 *fp;
+ struct raw3270_request *rq;
+ struct idal_buffer *ib;
+ int write_command;
+ ssize_t rc;
+
+ fp = filp->private_data;
+ if (!fp)
+ return -ENODEV;
+ ib = idal_buffer_alloc(count, 0);
+ if (IS_ERR(ib))
+ return -ENOMEM;
+ rq = raw3270_request_alloc(0);
+ if (!IS_ERR(rq)) {
+ if (idal_buffer_from_user(ib, data, count) == 0) {
+ write_command = fp->write_command ? : 1;
+ if (write_command == 5)
+ write_command = 13;
+ raw3270_request_set_cmd(rq, write_command);
+ raw3270_request_set_idal(rq, ib);
+ rc = fs3270_do_io(&fp->view, rq);
+ if (rc == 0)
+ rc = count - rq->rescnt;
+ } else
+ rc = -EFAULT;
+ raw3270_request_free(rq);
+ } else
+ rc = PTR_ERR(rq);
+ idal_buffer_free(ib);
+ return rc;
+}
+
+/*
+ * process ioctl commands for the tube driver
+ */
+static long
+fs3270_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+ char __user *argp;
+ struct fs3270 *fp;
+ struct raw3270_iocb iocb;
+ int rc;
+
+ fp = filp->private_data;
+ if (!fp)
+ return -ENODEV;
+ if (is_compat_task())
+ argp = compat_ptr(arg);
+ else
+ argp = (char __user *)arg;
+ rc = 0;
+ mutex_lock(&fs3270_mutex);
+ switch (cmd) {
+ case TUBICMD:
+ fp->read_command = arg;
+ break;
+ case TUBOCMD:
+ fp->write_command = arg;
+ break;
+ case TUBGETI:
+ rc = put_user(fp->read_command, argp);
+ break;
+ case TUBGETO:
+ rc = put_user(fp->write_command, argp);
+ break;
+ case TUBGETMOD:
+ iocb.model = fp->view.model;
+ iocb.line_cnt = fp->view.rows;
+ iocb.col_cnt = fp->view.cols;
+ iocb.pf_cnt = 24;
+ iocb.re_cnt = 20;
+ iocb.map = 0;
+ if (copy_to_user(argp, &iocb, sizeof(struct raw3270_iocb)))
+ rc = -EFAULT;
+ break;
+ }
+ mutex_unlock(&fs3270_mutex);
+ return rc;
+}
+
+/*
+ * Allocate fs3270 structure.
+ */
+static struct fs3270 *
+fs3270_alloc_view(void)
+{
+ struct fs3270 *fp;
+
+ fp = kzalloc(sizeof(struct fs3270),GFP_KERNEL);
+ if (!fp)
+ return ERR_PTR(-ENOMEM);
+ fp->init = raw3270_request_alloc(0);
+ if (IS_ERR(fp->init)) {
+ kfree(fp);
+ return ERR_PTR(-ENOMEM);
+ }
+ return fp;
+}
+
+/*
+ * Free fs3270 structure.
+ */
+static void
+fs3270_free_view(struct raw3270_view *view)
+{
+ struct fs3270 *fp;
+
+ fp = (struct fs3270 *) view;
+ if (fp->rdbuf)
+ idal_buffer_free(fp->rdbuf);
+ raw3270_request_free(((struct fs3270 *) view)->init);
+ kfree(view);
+}
+
+/*
+ * Unlink fs3270 data structure from filp.
+ */
+static void
+fs3270_release(struct raw3270_view *view)
+{
+ struct fs3270 *fp;
+
+ fp = (struct fs3270 *) view;
+ if (fp->fs_pid)
+ kill_pid(fp->fs_pid, SIGHUP, 1);
+}
+
+/* View to a 3270 device. Can be console, tty or fullscreen. */
+static struct raw3270_fn fs3270_fn = {
+ .activate = fs3270_activate,
+ .deactivate = fs3270_deactivate,
+ .intv = (void *) fs3270_irq,
+ .release = fs3270_release,
+ .free = fs3270_free_view
+};
+
+/*
+ * This routine is called whenever a 3270 fullscreen device is opened.
+ */
+static int
+fs3270_open(struct inode *inode, struct file *filp)
+{
+ struct fs3270 *fp;
+ struct idal_buffer *ib;
+ int minor, rc = 0;
+
+ if (imajor(filp->f_path.dentry->d_inode) != IBM_FS3270_MAJOR)
+ return -ENODEV;
+ minor = iminor(filp->f_path.dentry->d_inode);
+ /* Check for minor 0 multiplexer. */
+ if (minor == 0) {
+ struct tty_struct *tty = get_current_tty();
+ if (!tty || tty->driver->major != IBM_TTY3270_MAJOR) {
+ tty_kref_put(tty);
+ return -ENODEV;
+ }
+ minor = tty->index + RAW3270_FIRSTMINOR;
+ tty_kref_put(tty);
+ }
+ mutex_lock(&fs3270_mutex);
+ /* Check if some other program is already using fullscreen mode. */
+ fp = (struct fs3270 *) raw3270_find_view(&fs3270_fn, minor);
+ if (!IS_ERR(fp)) {
+ raw3270_put_view(&fp->view);
+ rc = -EBUSY;
+ goto out;
+ }
+ /* Allocate fullscreen view structure. */
+ fp = fs3270_alloc_view();
+ if (IS_ERR(fp)) {
+ rc = PTR_ERR(fp);
+ goto out;
+ }
+
+ init_waitqueue_head(&fp->wait);
+ fp->fs_pid = get_pid(task_pid(current));
+ rc = raw3270_add_view(&fp->view, &fs3270_fn, minor);
+ if (rc) {
+ fs3270_free_view(&fp->view);
+ goto out;
+ }
+
+ /* Allocate idal-buffer. */
+ ib = idal_buffer_alloc(2*fp->view.rows*fp->view.cols + 5, 0);
+ if (IS_ERR(ib)) {
+ raw3270_put_view(&fp->view);
+ raw3270_del_view(&fp->view);
+ rc = PTR_ERR(ib);
+ goto out;
+ }
+ fp->rdbuf = ib;
+
+ rc = raw3270_activate_view(&fp->view);
+ if (rc) {
+ raw3270_put_view(&fp->view);
+ raw3270_del_view(&fp->view);
+ goto out;
+ }
+ nonseekable_open(inode, filp);
+ filp->private_data = fp;
+out:
+ mutex_unlock(&fs3270_mutex);
+ return rc;
+}
+
+/*
+ * This routine is called when the 3270 tty is closed. We wait
+ * for the remaining request to be completed. Then we clean up.
+ */
+static int
+fs3270_close(struct inode *inode, struct file *filp)
+{
+ struct fs3270 *fp;
+
+ fp = filp->private_data;
+ filp->private_data = NULL;
+ if (fp) {
+ put_pid(fp->fs_pid);
+ fp->fs_pid = NULL;
+ raw3270_reset(&fp->view);
+ raw3270_put_view(&fp->view);
+ raw3270_del_view(&fp->view);
+ }
+ return 0;
+}
+
+static const struct file_operations fs3270_fops = {
+ .owner = THIS_MODULE, /* owner */
+ .read = fs3270_read, /* read */
+ .write = fs3270_write, /* write */
+ .unlocked_ioctl = fs3270_ioctl, /* ioctl */
+ .compat_ioctl = fs3270_ioctl, /* ioctl */
+ .open = fs3270_open, /* open */
+ .release = fs3270_close, /* release */
+ .llseek = no_llseek,
+};
+
+/*
+ * 3270 fullscreen driver initialization.
+ */
+static int __init
+fs3270_init(void)
+{
+ int rc;
+
+ rc = register_chrdev(IBM_FS3270_MAJOR, "fs3270", &fs3270_fops);
+ if (rc)
+ return rc;
+ return 0;
+}
+
+static void __exit
+fs3270_exit(void)
+{
+ unregister_chrdev(IBM_FS3270_MAJOR, "fs3270");
+}
+
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_CHARDEV_MAJOR(IBM_FS3270_MAJOR);
+
+module_init(fs3270_init);
+module_exit(fs3270_exit);