--- /dev/null
+/*
+ * interface to user space for the gigaset driver
+ *
+ * Copyright (c) 2004 by Hansjoerg Lipp <hjlipp@web.de>
+ *
+ * =====================================================================
+ * 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.
+ * =====================================================================
+ */
+
+#include "gigaset.h"
+#include <linux/gigaset_dev.h>
+#include <linux/tty_flip.h>
+#include <linux/module.h>
+
+/*** our ioctls ***/
+
+static int if_lock(struct cardstate *cs, int *arg)
+{
+ int cmd = *arg;
+
+ gig_dbg(DEBUG_IF, "%u: if_lock (%d)", cs->minor_index, cmd);
+
+ if (cmd > 1)
+ return -EINVAL;
+
+ if (cmd < 0) {
+ *arg = cs->mstate == MS_LOCKED;
+ return 0;
+ }
+
+ if (!cmd && cs->mstate == MS_LOCKED && cs->connected) {
+ cs->ops->set_modem_ctrl(cs, 0, TIOCM_DTR | TIOCM_RTS);
+ cs->ops->baud_rate(cs, B115200);
+ cs->ops->set_line_ctrl(cs, CS8);
+ cs->control_state = TIOCM_DTR | TIOCM_RTS;
+ }
+
+ cs->waiting = 1;
+ if (!gigaset_add_event(cs, &cs->at_state, EV_IF_LOCK,
+ NULL, cmd, NULL)) {
+ cs->waiting = 0;
+ return -ENOMEM;
+ }
+ gigaset_schedule_event(cs);
+
+ wait_event(cs->waitqueue, !cs->waiting);
+
+ if (cs->cmd_result >= 0) {
+ *arg = cs->cmd_result;
+ return 0;
+ }
+
+ return cs->cmd_result;
+}
+
+static int if_version(struct cardstate *cs, unsigned arg[4])
+{
+ static const unsigned version[4] = GIG_VERSION;
+ static const unsigned compat[4] = GIG_COMPAT;
+ unsigned cmd = arg[0];
+
+ gig_dbg(DEBUG_IF, "%u: if_version (%d)", cs->minor_index, cmd);
+
+ switch (cmd) {
+ case GIGVER_DRIVER:
+ memcpy(arg, version, sizeof version);
+ return 0;
+ case GIGVER_COMPAT:
+ memcpy(arg, compat, sizeof compat);
+ return 0;
+ case GIGVER_FWBASE:
+ cs->waiting = 1;
+ if (!gigaset_add_event(cs, &cs->at_state, EV_IF_VER,
+ NULL, 0, arg)) {
+ cs->waiting = 0;
+ return -ENOMEM;
+ }
+ gigaset_schedule_event(cs);
+
+ wait_event(cs->waitqueue, !cs->waiting);
+
+ if (cs->cmd_result >= 0)
+ return 0;
+
+ return cs->cmd_result;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int if_config(struct cardstate *cs, int *arg)
+{
+ gig_dbg(DEBUG_IF, "%u: if_config (%d)", cs->minor_index, *arg);
+
+ if (*arg != 1)
+ return -EINVAL;
+
+ if (cs->mstate != MS_LOCKED)
+ return -EBUSY;
+
+ if (!cs->connected) {
+ pr_err("%s: not connected\n", __func__);
+ return -ENODEV;
+ }
+
+ *arg = 0;
+ return gigaset_enterconfigmode(cs);
+}
+
+/*** the terminal driver ***/
+
+static int if_open(struct tty_struct *tty, struct file *filp)
+{
+ struct cardstate *cs;
+
+ gig_dbg(DEBUG_IF, "%d+%d: %s()",
+ tty->driver->minor_start, tty->index, __func__);
+
+ cs = gigaset_get_cs_by_tty(tty);
+ if (!cs || !try_module_get(cs->driver->owner))
+ return -ENODEV;
+
+ if (mutex_lock_interruptible(&cs->mutex)) {
+ module_put(cs->driver->owner);
+ return -ERESTARTSYS;
+ }
+ tty->driver_data = cs;
+
+ ++cs->port.count;
+
+ if (cs->port.count == 1) {
+ tty_port_tty_set(&cs->port, tty);
+ cs->port.low_latency = 1;
+ }
+
+ mutex_unlock(&cs->mutex);
+ return 0;
+}
+
+static void if_close(struct tty_struct *tty, struct file *filp)
+{
+ struct cardstate *cs = tty->driver_data;
+
+ if (!cs) { /* happens if we didn't find cs in open */
+ gig_dbg(DEBUG_IF, "%s: no cardstate", __func__);
+ return;
+ }
+
+ gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
+
+ mutex_lock(&cs->mutex);
+
+ if (!cs->connected)
+ gig_dbg(DEBUG_IF, "not connected"); /* nothing to do */
+ else if (!cs->port.count)
+ dev_warn(cs->dev, "%s: device not opened\n", __func__);
+ else if (!--cs->port.count)
+ tty_port_tty_set(&cs->port, NULL);
+
+ mutex_unlock(&cs->mutex);
+
+ module_put(cs->driver->owner);
+}
+
+static int if_ioctl(struct tty_struct *tty,
+ unsigned int cmd, unsigned long arg)
+{
+ struct cardstate *cs = tty->driver_data;
+ int retval = -ENODEV;
+ int int_arg;
+ unsigned char buf[6];
+ unsigned version[4];
+
+ gig_dbg(DEBUG_IF, "%u: %s(0x%x)", cs->minor_index, __func__, cmd);
+
+ if (mutex_lock_interruptible(&cs->mutex))
+ return -ERESTARTSYS;
+
+ if (!cs->connected) {
+ gig_dbg(DEBUG_IF, "not connected");
+ retval = -ENODEV;
+ } else {
+ retval = 0;
+ switch (cmd) {
+ case GIGASET_REDIR:
+ retval = get_user(int_arg, (int __user *) arg);
+ if (retval >= 0)
+ retval = if_lock(cs, &int_arg);
+ if (retval >= 0)
+ retval = put_user(int_arg, (int __user *) arg);
+ break;
+ case GIGASET_CONFIG:
+ retval = get_user(int_arg, (int __user *) arg);
+ if (retval >= 0)
+ retval = if_config(cs, &int_arg);
+ if (retval >= 0)
+ retval = put_user(int_arg, (int __user *) arg);
+ break;
+ case GIGASET_BRKCHARS:
+ retval = copy_from_user(&buf,
+ (const unsigned char __user *) arg, 6)
+ ? -EFAULT : 0;
+ if (retval >= 0) {
+ gigaset_dbg_buffer(DEBUG_IF, "GIGASET_BRKCHARS",
+ 6, (const unsigned char *) arg);
+ retval = cs->ops->brkchars(cs, buf);
+ }
+ break;
+ case GIGASET_VERSION:
+ retval = copy_from_user(version,
+ (unsigned __user *) arg, sizeof version)
+ ? -EFAULT : 0;
+ if (retval >= 0)
+ retval = if_version(cs, version);
+ if (retval >= 0)
+ retval = copy_to_user((unsigned __user *) arg,
+ version, sizeof version)
+ ? -EFAULT : 0;
+ break;
+ default:
+ gig_dbg(DEBUG_IF, "%s: arg not supported - 0x%04x",
+ __func__, cmd);
+ retval = -ENOIOCTLCMD;
+ }
+ }
+
+ mutex_unlock(&cs->mutex);
+
+ return retval;
+}
+
+static int if_tiocmget(struct tty_struct *tty)
+{
+ struct cardstate *cs = tty->driver_data;
+ int retval;
+
+ gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
+
+ if (mutex_lock_interruptible(&cs->mutex))
+ return -ERESTARTSYS;
+
+ retval = cs->control_state & (TIOCM_RTS | TIOCM_DTR);
+
+ mutex_unlock(&cs->mutex);
+
+ return retval;
+}
+
+static int if_tiocmset(struct tty_struct *tty,
+ unsigned int set, unsigned int clear)
+{
+ struct cardstate *cs = tty->driver_data;
+ int retval;
+ unsigned mc;
+
+ gig_dbg(DEBUG_IF, "%u: %s(0x%x, 0x%x)",
+ cs->minor_index, __func__, set, clear);
+
+ if (mutex_lock_interruptible(&cs->mutex))
+ return -ERESTARTSYS;
+
+ if (!cs->connected) {
+ gig_dbg(DEBUG_IF, "not connected");
+ retval = -ENODEV;
+ } else {
+ mc = (cs->control_state | set) & ~clear & (TIOCM_RTS | TIOCM_DTR);
+ retval = cs->ops->set_modem_ctrl(cs, cs->control_state, mc);
+ cs->control_state = mc;
+ }
+
+ mutex_unlock(&cs->mutex);
+
+ return retval;
+}
+
+static int if_write(struct tty_struct *tty, const unsigned char *buf, int count)
+{
+ struct cardstate *cs = tty->driver_data;
+ struct cmdbuf_t *cb;
+ int retval;
+
+ gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
+
+ if (mutex_lock_interruptible(&cs->mutex))
+ return -ERESTARTSYS;
+
+ if (!cs->connected) {
+ gig_dbg(DEBUG_IF, "not connected");
+ retval = -ENODEV;
+ goto done;
+ }
+ if (cs->mstate != MS_LOCKED) {
+ dev_warn(cs->dev, "can't write to unlocked device\n");
+ retval = -EBUSY;
+ goto done;
+ }
+ if (count <= 0) {
+ /* nothing to do */
+ retval = 0;
+ goto done;
+ }
+
+ cb = kmalloc(sizeof(struct cmdbuf_t) + count, GFP_KERNEL);
+ if (!cb) {
+ dev_err(cs->dev, "%s: out of memory\n", __func__);
+ retval = -ENOMEM;
+ goto done;
+ }
+
+ memcpy(cb->buf, buf, count);
+ cb->len = count;
+ cb->offset = 0;
+ cb->next = NULL;
+ cb->wake_tasklet = &cs->if_wake_tasklet;
+ retval = cs->ops->write_cmd(cs, cb);
+done:
+ mutex_unlock(&cs->mutex);
+ return retval;
+}
+
+static int if_write_room(struct tty_struct *tty)
+{
+ struct cardstate *cs = tty->driver_data;
+ int retval;
+
+ gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
+
+ if (mutex_lock_interruptible(&cs->mutex))
+ return -ERESTARTSYS;
+
+ if (!cs->connected) {
+ gig_dbg(DEBUG_IF, "not connected");
+ retval = -ENODEV;
+ } else if (cs->mstate != MS_LOCKED) {
+ dev_warn(cs->dev, "can't write to unlocked device\n");
+ retval = -EBUSY;
+ } else
+ retval = cs->ops->write_room(cs);
+
+ mutex_unlock(&cs->mutex);
+
+ return retval;
+}
+
+static int if_chars_in_buffer(struct tty_struct *tty)
+{
+ struct cardstate *cs = tty->driver_data;
+ int retval = 0;
+
+ gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
+
+ mutex_lock(&cs->mutex);
+
+ if (!cs->connected)
+ gig_dbg(DEBUG_IF, "not connected");
+ else if (cs->mstate != MS_LOCKED)
+ dev_warn(cs->dev, "can't write to unlocked device\n");
+ else
+ retval = cs->ops->chars_in_buffer(cs);
+
+ mutex_unlock(&cs->mutex);
+
+ return retval;
+}
+
+static void if_throttle(struct tty_struct *tty)
+{
+ struct cardstate *cs = tty->driver_data;
+
+ gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
+
+ mutex_lock(&cs->mutex);
+
+ if (!cs->connected)
+ gig_dbg(DEBUG_IF, "not connected"); /* nothing to do */
+ else
+ gig_dbg(DEBUG_IF, "%s: not implemented\n", __func__);
+
+ mutex_unlock(&cs->mutex);
+}
+
+static void if_unthrottle(struct tty_struct *tty)
+{
+ struct cardstate *cs = tty->driver_data;
+
+ gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
+
+ mutex_lock(&cs->mutex);
+
+ if (!cs->connected)
+ gig_dbg(DEBUG_IF, "not connected"); /* nothing to do */
+ else
+ gig_dbg(DEBUG_IF, "%s: not implemented\n", __func__);
+
+ mutex_unlock(&cs->mutex);
+}
+
+static void if_set_termios(struct tty_struct *tty, struct ktermios *old)
+{
+ struct cardstate *cs = tty->driver_data;
+ unsigned int iflag;
+ unsigned int cflag;
+ unsigned int old_cflag;
+ unsigned int control_state, new_state;
+
+ gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
+
+ mutex_lock(&cs->mutex);
+
+ if (!cs->connected) {
+ gig_dbg(DEBUG_IF, "not connected");
+ goto out;
+ }
+
+ iflag = tty->termios.c_iflag;
+ cflag = tty->termios.c_cflag;
+ old_cflag = old ? old->c_cflag : cflag;
+ gig_dbg(DEBUG_IF, "%u: iflag %x cflag %x old %x",
+ cs->minor_index, iflag, cflag, old_cflag);
+
+ /* get a local copy of the current port settings */
+ control_state = cs->control_state;
+
+ /*
+ * Update baud rate.
+ * Do not attempt to cache old rates and skip settings,
+ * disconnects screw such tricks up completely.
+ * Premature optimization is the root of all evil.
+ */
+
+ /* reassert DTR and (maybe) RTS on transition from B0 */
+ if ((old_cflag & CBAUD) == B0) {
+ new_state = control_state | TIOCM_DTR;
+ /* don't set RTS if using hardware flow control */
+ if (!(old_cflag & CRTSCTS))
+ new_state |= TIOCM_RTS;
+ gig_dbg(DEBUG_IF, "%u: from B0 - set DTR%s",
+ cs->minor_index,
+ (new_state & TIOCM_RTS) ? " only" : "/RTS");
+ cs->ops->set_modem_ctrl(cs, control_state, new_state);
+ control_state = new_state;
+ }
+
+ cs->ops->baud_rate(cs, cflag & CBAUD);
+
+ if ((cflag & CBAUD) == B0) {
+ /* Drop RTS and DTR */
+ gig_dbg(DEBUG_IF, "%u: to B0 - drop DTR/RTS", cs->minor_index);
+ new_state = control_state & ~(TIOCM_DTR | TIOCM_RTS);
+ cs->ops->set_modem_ctrl(cs, control_state, new_state);
+ control_state = new_state;
+ }
+
+ /*
+ * Update line control register (LCR)
+ */
+
+ cs->ops->set_line_ctrl(cs, cflag);
+
+ /* save off the modified port settings */
+ cs->control_state = control_state;
+
+out:
+ mutex_unlock(&cs->mutex);
+}
+
+static const struct tty_operations if_ops = {
+ .open = if_open,
+ .close = if_close,
+ .ioctl = if_ioctl,
+ .write = if_write,
+ .write_room = if_write_room,
+ .chars_in_buffer = if_chars_in_buffer,
+ .set_termios = if_set_termios,
+ .throttle = if_throttle,
+ .unthrottle = if_unthrottle,
+ .tiocmget = if_tiocmget,
+ .tiocmset = if_tiocmset,
+};
+
+
+/* wakeup tasklet for the write operation */
+static void if_wake(unsigned long data)
+{
+ struct cardstate *cs = (struct cardstate *)data;
+
+ tty_port_tty_wakeup(&cs->port);
+}
+
+/*** interface to common ***/
+
+void gigaset_if_init(struct cardstate *cs)
+{
+ struct gigaset_driver *drv;
+
+ drv = cs->driver;
+ if (!drv->have_tty)
+ return;
+
+ tasklet_init(&cs->if_wake_tasklet, if_wake, (unsigned long) cs);
+
+ mutex_lock(&cs->mutex);
+ cs->tty_dev = tty_port_register_device(&cs->port, drv->tty,
+ cs->minor_index, NULL);
+
+ if (!IS_ERR(cs->tty_dev))
+ dev_set_drvdata(cs->tty_dev, cs);
+ else {
+ pr_warning("could not register device to the tty subsystem\n");
+ cs->tty_dev = NULL;
+ }
+ mutex_unlock(&cs->mutex);
+}
+
+void gigaset_if_free(struct cardstate *cs)
+{
+ struct gigaset_driver *drv;
+
+ drv = cs->driver;
+ if (!drv->have_tty)
+ return;
+
+ tasklet_disable(&cs->if_wake_tasklet);
+ tasklet_kill(&cs->if_wake_tasklet);
+ cs->tty_dev = NULL;
+ tty_unregister_device(drv->tty, cs->minor_index);
+}
+
+/**
+ * gigaset_if_receive() - pass a received block of data to the tty device
+ * @cs: device descriptor structure.
+ * @buffer: received data.
+ * @len: number of bytes received.
+ *
+ * Called by asyncdata/isocdata if a block of data received from the
+ * device must be sent to userspace through the ttyG* device.
+ */
+void gigaset_if_receive(struct cardstate *cs,
+ unsigned char *buffer, size_t len)
+{
+ tty_insert_flip_string(&cs->port, buffer, len);
+ tty_flip_buffer_push(&cs->port);
+}
+EXPORT_SYMBOL_GPL(gigaset_if_receive);
+
+/* gigaset_if_initdriver
+ * Initialize tty interface.
+ * parameters:
+ * drv Driver
+ * procname Name of the driver (e.g. for /proc/tty/drivers)
+ * devname Name of the device files (prefix without minor number)
+ */
+void gigaset_if_initdriver(struct gigaset_driver *drv, const char *procname,
+ const char *devname)
+{
+ int ret;
+ struct tty_driver *tty;
+
+ drv->have_tty = 0;
+
+ drv->tty = tty = alloc_tty_driver(drv->minors);
+ if (tty == NULL)
+ goto enomem;
+
+ tty->type = TTY_DRIVER_TYPE_SERIAL;
+ tty->subtype = SERIAL_TYPE_NORMAL;
+ tty->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
+
+ tty->driver_name = procname;
+ tty->name = devname;
+ tty->minor_start = drv->minor;
+
+ tty->init_termios = tty_std_termios;
+ tty->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
+ tty_set_operations(tty, &if_ops);
+
+ ret = tty_register_driver(tty);
+ if (ret < 0) {
+ pr_err("error %d registering tty driver\n", ret);
+ goto error;
+ }
+ gig_dbg(DEBUG_IF, "tty driver initialized");
+ drv->have_tty = 1;
+ return;
+
+enomem:
+ pr_err("out of memory\n");
+error:
+ if (drv->tty)
+ put_tty_driver(drv->tty);
+}
+
+void gigaset_if_freedriver(struct gigaset_driver *drv)
+{
+ if (!drv->have_tty)
+ return;
+
+ drv->have_tty = 0;
+ tty_unregister_driver(drv->tty);
+ put_tty_driver(drv->tty);
+}
Code Review / kvmfornfv.git / blobdiff