[PATCH] isdn4linux: Siemens Gigaset drivers - tty interface (ee8a4b7f) · Commits · 戴 / test

drivers/isdn/gigaset/interface.c

0 → 100644

+718 −0

Original line number	Diff line number	Diff line
		/*
		* 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.
		* =====================================================================
		* Version: $Id: interface.c,v 1.14.4.15 2006/02/04 18:28:16 hjlipp Exp $
		* =====================================================================
		*/

		#include "gigaset.h"
		#include <linux/gigaset_dev.h>
		#include <linux/tty.h>
		#include <linux/tty_flip.h>

		/* our ioctls */

		static int if_lock(struct cardstate cs, int arg)
		{
		int cmd = *arg;

		dbg(DEBUG_IF, "%u: if_lock (%d)", cs->minor_index, cmd);

		if (cmd > 1)
		return -EINVAL;

		if (cmd < 0) {
		*arg = atomic_read(&cs->mstate) == MS_LOCKED; //FIXME remove?
		return 0;
		}

		if (!cmd && atomic_read(&cs->mstate) == MS_LOCKED
		&& atomic_read(&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;
		}

		dbg(DEBUG_CMD, "scheduling IF_LOCK");
		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];

		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;
		}

		dbg(DEBUG_CMD, "scheduling IF_VER");
		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)
		{
		dbg(DEBUG_IF, "%u: if_config (%d)", cs->minor_index, *arg);

		if (*arg != 1)
		return -EINVAL;

		if (atomic_read(&cs->mstate) != MS_LOCKED)
		return -EBUSY;

		*arg = 0;
		return gigaset_enterconfigmode(cs);
		}

		/* the terminal driver */
		/* stolen from usbserial and some other tty drivers */

		static int if_open(struct tty_struct tty, struct file filp);
		static void if_close(struct tty_struct tty, struct file filp);
		static int if_ioctl(struct tty_struct tty, struct file file,
		unsigned int cmd, unsigned long arg);
		static int if_write_room(struct tty_struct *tty);
		static int if_chars_in_buffer(struct tty_struct *tty);
		static void if_throttle(struct tty_struct *tty);
		static void if_unthrottle(struct tty_struct *tty);
		static void if_set_termios(struct tty_struct tty, struct termios old);
		static int if_tiocmget(struct tty_struct tty, struct file file);
		static int if_tiocmset(struct tty_struct tty, struct file file,
		unsigned int set, unsigned int clear);
		static int if_write(struct tty_struct *tty,
		const unsigned char *buf, int count);

		static 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,
		#if 0
		.break_ctl = serial_break,
		#endif
		.tiocmget = if_tiocmget,
		.tiocmset = if_tiocmset,
		};

		static int if_open(struct tty_struct tty, struct file filp)
		{
		struct cardstate *cs;
		unsigned long flags;

		dbg(DEBUG_IF, "%d+%d: %s()", tty->driver->minor_start, tty->index,
		__FUNCTION__);

		tty->driver_data = NULL;

		cs = gigaset_get_cs_by_tty(tty);
		if (!cs)
		return -ENODEV;

		if (down_interruptible(&cs->sem))
		return -ERESTARTSYS; // FIXME -EINTR?
		tty->driver_data = cs;

		++cs->open_count;

		if (cs->open_count == 1) {
		spin_lock_irqsave(&cs->lock, flags);
		cs->tty = tty;
		spin_unlock_irqrestore(&cs->lock, flags);
		tty->low_latency = 1; //FIXME test
		//FIXME
		}

		up(&cs->sem);
		return 0;
		}

		static void if_close(struct tty_struct tty, struct file filp)
		{
		struct cardstate *cs;
		unsigned long flags;

		cs = (struct cardstate *) tty->driver_data;
		if (!cs) {
		err("cs==NULL in %s", __FUNCTION__);
		return;
		}

		dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __FUNCTION__);

		down(&cs->sem);

		if (!cs->open_count)
		warn("%s: device not opened", __FUNCTION__);
		else {
		if (!--cs->open_count) {
		spin_lock_irqsave(&cs->lock, flags);
		cs->tty = NULL;
		spin_unlock_irqrestore(&cs->lock, flags);
		//FIXME
		}
		}

		up(&cs->sem);
		}

		static int if_ioctl(struct tty_struct tty, struct file file,
		unsigned int cmd, unsigned long arg)
		{
		struct cardstate *cs;
		int retval = -ENODEV;
		int int_arg;
		unsigned char buf[6];
		unsigned version[4];

		cs = (struct cardstate *) tty->driver_data;
		if (!cs) {
		err("cs==NULL in %s", __FUNCTION__);
		return -ENODEV;
		}

		dbg(DEBUG_IF, "%u: %s(0x%x)", cs->minor_index, __FUNCTION__, cmd);

		if (down_interruptible(&cs->sem))
		return -ERESTARTSYS; // FIXME -EINTR?

		if (!cs->open_count)
		warn("%s: device not opened", __FUNCTION__);
		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:
		//FIXME test if MS_LOCKED
		gigaset_dbg_buffer(DEBUG_IF, "GIGASET_BRKCHARS",
		6, (const unsigned char *) arg, 1);
		if (!atomic_read(&cs->connected)) {
		dbg(DEBUG_ANY, "can't communicate with unplugged device");
		retval = -ENODEV;
		break;
		}
		retval = copy_from_user(&buf,
		(const unsigned char __user *) arg, 6)
		? -EFAULT : 0;
		if (retval >= 0)
		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:
		dbg(DEBUG_ANY, "%s: arg not supported - 0x%04x",
		__FUNCTION__, cmd);
		retval = -ENOIOCTLCMD;
		}
		}

		up(&cs->sem);

		return retval;
		}

		static int if_tiocmget(struct tty_struct tty, struct file file)
		{
		struct cardstate *cs;
		int retval;

		cs = (struct cardstate *) tty->driver_data;
		if (!cs) {
		err("cs==NULL in %s", __FUNCTION__);
		return -ENODEV;
		}

		dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __FUNCTION__);

		if (down_interruptible(&cs->sem))
		return -ERESTARTSYS; // FIXME -EINTR?

		// FIXME read from device?
		retval = cs->control_state & (TIOCM_RTS\|TIOCM_DTR);

		up(&cs->sem);

		return retval;
		}

		static int if_tiocmset(struct tty_struct tty, struct file file,
		unsigned int set, unsigned int clear)
		{
		struct cardstate *cs;
		int retval;
		unsigned mc;

		cs = (struct cardstate *) tty->driver_data;
		if (!cs) {
		err("cs==NULL in %s", __FUNCTION__);
		return -ENODEV;
		}

		dbg(DEBUG_IF,
		"%u: %s(0x%x, 0x%x)", cs->minor_index, __FUNCTION__, set, clear);

		if (down_interruptible(&cs->sem))
		return -ERESTARTSYS; // FIXME -EINTR?

		if (!atomic_read(&cs->connected)) {
		dbg(DEBUG_ANY, "can't communicate with unplugged device");
		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;
		}

		up(&cs->sem);

		return retval;
		}

		static int if_write(struct tty_struct tty, const unsigned char buf, int count)
		{
		struct cardstate *cs;
		int retval = -ENODEV;

		cs = (struct cardstate *) tty->driver_data;
		if (!cs) {
		err("cs==NULL in %s", __FUNCTION__);
		return -ENODEV;
		}

		dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __FUNCTION__);

		if (down_interruptible(&cs->sem))
		return -ERESTARTSYS; // FIXME -EINTR?

		if (!cs->open_count)
		warn("%s: device not opened", __FUNCTION__);
		else if (atomic_read(&cs->mstate) != MS_LOCKED) {
		warn("can't write to unlocked device");
		retval = -EBUSY;
		} else if (!atomic_read(&cs->connected)) {
		dbg(DEBUG_ANY, "can't write to unplugged device");
		retval = -EBUSY; //FIXME
		} else {
		retval = cs->ops->write_cmd(cs, buf, count,
		&cs->if_wake_tasklet);
		}

		up(&cs->sem);

		return retval;
		}

		static int if_write_room(struct tty_struct *tty)
		{
		struct cardstate *cs;
		int retval = -ENODEV;

		cs = (struct cardstate *) tty->driver_data;
		if (!cs) {
		err("cs==NULL in %s", __FUNCTION__);
		return -ENODEV;
		}

		dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __FUNCTION__);

		if (down_interruptible(&cs->sem))
		return -ERESTARTSYS; // FIXME -EINTR?

		if (!cs->open_count)
		warn("%s: device not opened", __FUNCTION__);
		else if (atomic_read(&cs->mstate) != MS_LOCKED) {
		warn("can't write to unlocked device");
		retval = -EBUSY; //FIXME
		} else if (!atomic_read(&cs->connected)) {
		dbg(DEBUG_ANY, "can't write to unplugged device");
		retval = -EBUSY; //FIXME
		} else
		retval = cs->ops->write_room(cs);

		up(&cs->sem);

		return retval;
		}

		static int if_chars_in_buffer(struct tty_struct *tty)
		{
		struct cardstate *cs;
		int retval = -ENODEV;

		cs = (struct cardstate *) tty->driver_data;
		if (!cs) {
		err("cs==NULL in %s", __FUNCTION__);
		return -ENODEV;
		}

		dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __FUNCTION__);

		if (down_interruptible(&cs->sem))
		return -ERESTARTSYS; // FIXME -EINTR?

		if (!cs->open_count)
		warn("%s: device not opened", __FUNCTION__);
		else if (atomic_read(&cs->mstate) != MS_LOCKED) {
		warn("can't write to unlocked device");
		retval = -EBUSY;
		} else if (!atomic_read(&cs->connected)) {
		dbg(DEBUG_ANY, "can't write to unplugged device");
		retval = -EBUSY; //FIXME
		} else
		retval = cs->ops->chars_in_buffer(cs);

		up(&cs->sem);

		return retval;
		}

		static void if_throttle(struct tty_struct *tty)
		{
		struct cardstate *cs;

		cs = (struct cardstate *) tty->driver_data;
		if (!cs) {
		err("cs==NULL in %s", __FUNCTION__);
		return;
		}

		dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __FUNCTION__);

		down(&cs->sem);

		if (!cs->open_count)
		warn("%s: device not opened", __FUNCTION__);
		else {
		//FIXME
		}

		up(&cs->sem);
		}

		static void if_unthrottle(struct tty_struct *tty)
		{
		struct cardstate *cs;

		cs = (struct cardstate *) tty->driver_data;
		if (!cs) {
		err("cs==NULL in %s", __FUNCTION__);
		return;
		}

		dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __FUNCTION__);

		down(&cs->sem);

		if (!cs->open_count)
		warn("%s: device not opened", __FUNCTION__);
		else {
		//FIXME
		}

		up(&cs->sem);
		}

		static void if_set_termios(struct tty_struct tty, struct termios old)
		{
		struct cardstate *cs;
		unsigned int iflag;
		unsigned int cflag;
		unsigned int old_cflag;
		unsigned int control_state, new_state;

		cs = (struct cardstate *) tty->driver_data;
		if (!cs) {
		err("cs==NULL in %s", __FUNCTION__);
		return;
		}

		dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __FUNCTION__);

		down(&cs->sem);

		if (!cs->open_count) {
		warn("%s: device not opened", __FUNCTION__);
		goto out;
		}

		if (!atomic_read(&cs->connected)) {
		dbg(DEBUG_ANY, "can't communicate with unplugged device");
		goto out;
		}

		// stolen from mct_u232.c
		iflag = tty->termios->c_iflag;
		cflag = tty->termios->c_cflag;
		old_cflag = old ? old->c_cflag : cflag; //FIXME?
		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;
		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 */
		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);

		#if 0
		//FIXME this hangs M101 [ts 2005-03-09]
		//FIXME do we need this?
		/*
		* Set flow control: well, I do not really now how to handle DTR/RTS.
		* Just do what we have seen with SniffUSB on Win98.
		*/
		/* Drop DTR/RTS if no flow control otherwise assert */
		dbg(DEBUG_IF, "%u: control_state %x", cs->minor_index, control_state);
		new_state = control_state;
		if ((iflag & IXOFF) \|\| (iflag & IXON) \|\| (cflag & CRTSCTS))
		new_state \|= TIOCM_DTR \| TIOCM_RTS;
		else
		new_state &= ~(TIOCM_DTR \| TIOCM_RTS);
		if (new_state != control_state) {
		dbg(DEBUG_IF, "%u: new_state %x", cs->minor_index, new_state);
		gigaset_set_modem_ctrl(cs, control_state, new_state); // FIXME: mct_u232.c sets the old state here. is this a bug?
		control_state = new_state;
		}
		#endif

		/* save off the modified port settings */
		cs->control_state = control_state;

		out:
		up(&cs->sem);
		}


		/* wakeup tasklet for the write operation */
		static void if_wake(unsigned long data)
		{
		struct cardstate cs = (struct cardstate ) data;
		struct tty_struct *tty;

		tty = cs->tty;
		if (!tty)
		return;

		if ((tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&
		tty->ldisc.write_wakeup) {
		dbg(DEBUG_IF, "write wakeup call");
		tty->ldisc.write_wakeup(tty);
		}

		wake_up_interruptible(&tty->write_wait);
		}

		/* 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);
		tty_register_device(drv->tty, cs->minor_index, NULL);
		}

		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);
		tty_unregister_device(drv->tty, cs->minor_index);
		}

		void gigaset_if_receive(struct cardstate *cs,
		unsigned char *buffer, size_t len)
		{
		unsigned long flags;
		struct tty_struct *tty;

		spin_lock_irqsave(&cs->lock, flags);
		if ((tty = cs->tty) == NULL)
		dbg(DEBUG_ANY, "receive on closed device");
		else {
		tty_buffer_request_room(tty, len);
		tty_insert_flip_string(tty, buffer, len);
		tty_flip_buffer_push(tty);
		}
		spin_unlock_irqrestore(&cs->lock, flags);
		}
		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)
		* devfsname Devfs name of the device files without %d
		*/
		void gigaset_if_initdriver(struct gigaset_driver drv, const char procname,
		const char devname, const char devfsname)
		{
		unsigned minors = drv->minors;
		int ret;
		struct tty_driver *tty;

		drv->have_tty = 0;

		if ((drv->tty = alloc_tty_driver(minors)) == NULL)
		goto enomem;
		tty = drv->tty;

		tty->magic = TTY_DRIVER_MAGIC,
		tty->major = GIG_MAJOR,
		tty->type = TTY_DRIVER_TYPE_SERIAL,
		tty->subtype = SERIAL_TYPE_NORMAL,
		tty->flags = TTY_DRIVER_REAL_RAW \| TTY_DRIVER_NO_DEVFS,

		tty->driver_name = procname;
		tty->name = devname;
		tty->minor_start = drv->minor;
		tty->num = drv->minors;

		tty->owner = THIS_MODULE;
		tty->devfs_name = devfsname;

		tty->init_termios = tty_std_termios; //FIXME
		tty->init_termios.c_cflag = B9600 \| CS8 \| CREAD \| HUPCL \| CLOCAL; //FIXME
		tty_set_operations(tty, &if_ops);

		ret = tty_register_driver(tty);
		if (ret < 0) {
		warn("failed to register tty driver (error %d)", ret);
		goto error;
		}
		dbg(DEBUG_IF, "tty driver initialized");
		drv->have_tty = 1;
		return;

		enomem:
		warn("could not allocate tty structures");
		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);
		}

include/linux/gigaset_dev.h

0 → 100644

+32 −0

Original line number	Diff line number	Diff line
		/*
		* 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.
		* =====================================================================
		* Version: $Id: gigaset_dev.h,v 1.4.4.4 2005/11/21 22:28:09 hjlipp Exp $
		* =====================================================================
		*/

		#ifndef GIGASET_INTERFACE_H
		#define GIGASET_INTERFACE_H

		#include <linux/ioctl.h>

		#define GIGASET_IOCTL 0x47

		#define GIGVER_DRIVER 0
		#define GIGVER_COMPAT 1
		#define GIGVER_FWBASE 2

		#define GIGASET_REDIR _IOWR (GIGASET_IOCTL, 0, int)
		#define GIGASET_CONFIG _IOWR (GIGASET_IOCTL, 1, int)
		#define GIGASET_BRKCHARS _IOW (GIGASET_IOCTL, 2, unsigned char[6]) //FIXME [6] okay?
		#define GIGASET_VERSION _IOWR (GIGASET_IOCTL, 3, unsigned[4])

		#endif

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