tty/module.c
author Florian Pose <fp@igh-essen.com>
Tue, 05 Jan 2010 12:36:29 +0100
changeset 1591 14733a170f6b
parent 1577 fa3f66b783c1
child 1595 8d8657654921
permissions -rw-r--r--
Ignore documentation files.
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/******************************************************************************
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 *
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 *  $Id$
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 *
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 *  Copyright (C) 2006-2008  Florian Pose, Ingenieurgemeinschaft IgH
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 *
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 *  This file is part of the IgH EtherCAT Master.
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 *
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 *  The IgH EtherCAT Master is free software; you can redistribute it and/or
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 *  modify it under the terms of the GNU General Public License version 2, as
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 *  published by the Free Software Foundation.
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 *
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 *  The IgH EtherCAT Master is distributed in the hope that it will be useful,
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 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
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 *  Public License for more details.
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 *
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 *  You should have received a copy of the GNU General Public License along
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 *  with the IgH EtherCAT Master; if not, write to the Free Software
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 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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 *
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 *  ---
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 *
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 *  The license mentioned above concerns the source code only. Using the
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 *  EtherCAT technology and brand is only permitted in compliance with the
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 *  industrial property and similar rights of Beckhoff Automation GmbH.
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 *
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 *****************************************************************************/
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/** \file
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 * EtherCAT tty driver module.
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 */
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/*****************************************************************************/
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#include <linux/module.h>
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#include <linux/err.h>
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#include <linux/tty.h>
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#include <linux/tty_driver.h>
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#include <linux/tty_flip.h>
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#include <linux/termios.h>
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#include <linux/timer.h>
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#include "../master/globals.h"
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#include "../include/ectty.h"
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/*****************************************************************************/
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#define PFX "ec_tty: "
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#define EC_TTY_MAX_DEVICES 10
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#define EC_TTY_TX_BUFFER_SIZE 100
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#define EC_TTY_RX_BUFFER_SIZE 100
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#define EC_TTY_DEBUG 0
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/*****************************************************************************/
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char *ec_master_version_str = EC_MASTER_VERSION; /**< Version string. */
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unsigned int debug_level = 0;
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static struct tty_driver *tty_driver = NULL;
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ec_tty_t *ttys[EC_TTY_MAX_DEVICES];
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struct semaphore tty_sem;
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/*****************************************************************************/
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/** \cond */
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MODULE_AUTHOR("Florian Pose <fp@igh-essen.com>");
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MODULE_DESCRIPTION("EtherCAT TTY driver module");
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MODULE_LICENSE("GPL");
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MODULE_VERSION(EC_MASTER_VERSION);
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module_param_named(debug_level, debug_level, uint, S_IRUGO);
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MODULE_PARM_DESC(debug_level, "Debug level");
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/** \endcond */
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static struct ktermios ec_tty_std_termios = {
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    .c_iflag = ICRNL | IXON,
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    .c_oflag = OPOST,
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    .c_cflag = B38400 | CS8 | CREAD | HUPCL,
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    .c_lflag = ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHOCTL | ECHOKE | IEXTEN,
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    .c_cc = INIT_C_CC,
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};
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struct ec_tty {
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    int minor;
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    struct device *dev;
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    uint8_t tx_buffer[EC_TTY_TX_BUFFER_SIZE];
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    unsigned int tx_read_idx;
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    unsigned int tx_write_idx;
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    unsigned int wakeup;
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    uint8_t rx_buffer[EC_TTY_RX_BUFFER_SIZE];
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    unsigned int rx_read_idx;
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    unsigned int rx_write_idx;
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    struct timer_list timer;
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    struct tty_struct *tty;
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};
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static const struct tty_operations ec_tty_ops; // see below
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/*****************************************************************************/
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/** Module initialization.
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 *
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 * \return 0 on success, else < 0
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 */
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int __init ec_tty_init_module(void)
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{
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    int i, ret = 0;
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    printk(KERN_INFO PFX "TTY driver %s\n", EC_MASTER_VERSION);
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    init_MUTEX(&tty_sem);
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    for (i = 0; i < EC_TTY_MAX_DEVICES; i++) {
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        ttys[i] = NULL;
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    }
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    tty_driver = alloc_tty_driver(EC_TTY_MAX_DEVICES);
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    if (!tty_driver) {
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        printk(KERN_ERR PFX "Failed to allocate tty driver.\n");
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        ret = -ENOMEM;
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        goto out_return;
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    }
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    tty_driver->owner = THIS_MODULE;
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    tty_driver->driver_name = "EtherCAT TTY";
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    tty_driver->name = "ttyEC";
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    tty_driver->major = 0;
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    tty_driver->minor_start = 0;
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    tty_driver->type = TTY_DRIVER_TYPE_SERIAL;
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    tty_driver->subtype = SERIAL_TYPE_NORMAL;
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    tty_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
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    tty_driver->init_termios = ec_tty_std_termios;
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    tty_driver->init_termios.c_cflag = B9600 | CS8 | CREAD | HUPCL | CLOCAL;
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    tty_set_operations(tty_driver, &ec_tty_ops);
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    ret = tty_register_driver(tty_driver);
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    if (ret) {
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        printk(KERN_ERR PFX "Failed to register tty driver.\n");
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        goto out_put;
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    }
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    return ret;
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out_put:
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    put_tty_driver(tty_driver);
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out_return:
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    return ret;
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}
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/*****************************************************************************/
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/** Module cleanup.
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 *
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 * Clears all master instances.
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 */
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void __exit ec_tty_cleanup_module(void)
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{
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    tty_unregister_driver(tty_driver);
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    put_tty_driver(tty_driver);
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   168
    printk(KERN_INFO PFX "Module unloading.\n");
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}
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/*****************************************************************************/
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unsigned int ec_tty_tx_size(ec_tty_t *tty)
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{
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    unsigned int ret;
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   177
    if (tty->tx_write_idx >= tty->tx_read_idx) {
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        ret = tty->tx_write_idx - tty->tx_read_idx;
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   179
    } else {
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        ret = EC_TTY_TX_BUFFER_SIZE + tty->tx_write_idx - tty->tx_read_idx;
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   181
    }
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    return ret;
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}
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   185
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/*****************************************************************************/
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   187
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   188
unsigned int ec_tty_tx_space(ec_tty_t *tty)
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   189
{
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   190
    return EC_TTY_TX_BUFFER_SIZE - 1 - ec_tty_tx_size(tty);
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   191
}
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   192
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   193
/*****************************************************************************/
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   194
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   195
unsigned int ec_tty_rx_size(ec_tty_t *tty)
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{
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   197
    unsigned int ret;
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   198
    
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   199
    if (tty->rx_write_idx >= tty->rx_read_idx) {
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   200
        ret = tty->rx_write_idx - tty->rx_read_idx;
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   201
    } else {
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   202
        ret = EC_TTY_RX_BUFFER_SIZE + tty->rx_write_idx - tty->rx_read_idx;
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   203
    }
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   204
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   205
    return ret;
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   206
}
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   207
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   208
/*****************************************************************************/
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   209
fa3f66b783c1 Implemented reading direction of tty driver.
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   210
unsigned int ec_tty_rx_space(ec_tty_t *tty)
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{
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   212
    return EC_TTY_RX_BUFFER_SIZE - 1 - ec_tty_rx_size(tty);
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   213
}
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   214
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   215
/*****************************************************************************/
fa3f66b783c1 Implemented reading direction of tty driver.
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   216
fa3f66b783c1 Implemented reading direction of tty driver.
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   217
void ec_tty_wakeup(unsigned long data)
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   218
{
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   219
    ec_tty_t *tty = (ec_tty_t *) data;
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   220
    size_t to_recv;
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   221
fa3f66b783c1 Implemented reading direction of tty driver.
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   222
    /* Wake up any process waiting to send data */
fa3f66b783c1 Implemented reading direction of tty driver.
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   223
    if (tty->wakeup) {
fa3f66b783c1 Implemented reading direction of tty driver.
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   224
        if (tty->tty) {
fa3f66b783c1 Implemented reading direction of tty driver.
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   225
#if EC_TTY_DEBUG >= 1
fa3f66b783c1 Implemented reading direction of tty driver.
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   226
            printk(KERN_INFO PFX "Waking up.\n");
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   227
#endif
fa3f66b783c1 Implemented reading direction of tty driver.
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   228
            tty_wakeup(tty->tty);
fa3f66b783c1 Implemented reading direction of tty driver.
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   229
        }
fa3f66b783c1 Implemented reading direction of tty driver.
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   230
        tty->wakeup = 0;
fa3f66b783c1 Implemented reading direction of tty driver.
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diff changeset
   231
    }
fa3f66b783c1 Implemented reading direction of tty driver.
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   232
fa3f66b783c1 Implemented reading direction of tty driver.
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   233
    /* Push received data into TTY core. */
fa3f66b783c1 Implemented reading direction of tty driver.
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   234
    to_recv = ec_tty_rx_size(tty);
fa3f66b783c1 Implemented reading direction of tty driver.
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   235
    if (to_recv && tty->tty) {
fa3f66b783c1 Implemented reading direction of tty driver.
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diff changeset
   236
        unsigned char *cbuf;
fa3f66b783c1 Implemented reading direction of tty driver.
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   237
        int space = tty_prepare_flip_string(tty->tty, &cbuf, to_recv);
fa3f66b783c1 Implemented reading direction of tty driver.
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   238
fa3f66b783c1 Implemented reading direction of tty driver.
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diff changeset
   239
		if (space < to_recv) {
fa3f66b783c1 Implemented reading direction of tty driver.
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diff changeset
   240
			printk(KERN_WARNING PFX "Insufficient space to_recv=%d space=%d\n",
fa3f66b783c1 Implemented reading direction of tty driver.
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diff changeset
   241
                    to_recv, space);
fa3f66b783c1 Implemented reading direction of tty driver.
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   242
		}
fa3f66b783c1 Implemented reading direction of tty driver.
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   243
fa3f66b783c1 Implemented reading direction of tty driver.
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diff changeset
   244
        if (space < 0) {
fa3f66b783c1 Implemented reading direction of tty driver.
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diff changeset
   245
            to_recv = 0;
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
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diff changeset
   246
        } else {
fa3f66b783c1 Implemented reading direction of tty driver.
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diff changeset
   247
            to_recv = space;
fa3f66b783c1 Implemented reading direction of tty driver.
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diff changeset
   248
        }
fa3f66b783c1 Implemented reading direction of tty driver.
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   249
fa3f66b783c1 Implemented reading direction of tty driver.
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   250
        if (to_recv) {
fa3f66b783c1 Implemented reading direction of tty driver.
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   251
            unsigned int i;
fa3f66b783c1 Implemented reading direction of tty driver.
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   252
fa3f66b783c1 Implemented reading direction of tty driver.
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   253
#if EC_TTY_DEBUG >= 1
fa3f66b783c1 Implemented reading direction of tty driver.
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   254
            printk(KERN_INFO PFX "Pushing %u bytes to TTY core.\n", to_recv);
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   255
#endif
fa3f66b783c1 Implemented reading direction of tty driver.
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   256
fa3f66b783c1 Implemented reading direction of tty driver.
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   257
            for (i = 0; i < to_recv; i++) {
fa3f66b783c1 Implemented reading direction of tty driver.
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   258
                cbuf[i] = tty->rx_buffer[tty->rx_read_idx];
fa3f66b783c1 Implemented reading direction of tty driver.
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   259
                tty->rx_read_idx = (tty->rx_read_idx + 1) % EC_TTY_RX_BUFFER_SIZE;
fa3f66b783c1 Implemented reading direction of tty driver.
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   260
            }
fa3f66b783c1 Implemented reading direction of tty driver.
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   261
            tty_flip_buffer_push(tty->tty);
fa3f66b783c1 Implemented reading direction of tty driver.
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   262
        }
fa3f66b783c1 Implemented reading direction of tty driver.
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   263
	}
fa3f66b783c1 Implemented reading direction of tty driver.
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   264
    
fa3f66b783c1 Implemented reading direction of tty driver.
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   265
    tty->timer.expires += 1;
fa3f66b783c1 Implemented reading direction of tty driver.
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   266
    add_timer(&tty->timer);
fa3f66b783c1 Implemented reading direction of tty driver.
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   267
}
fa3f66b783c1 Implemented reading direction of tty driver.
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   268
fa3f66b783c1 Implemented reading direction of tty driver.
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   269
/*****************************************************************************/
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   270
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   271
int ec_tty_init(ec_tty_t *tty, int minor)
fa3f66b783c1 Implemented reading direction of tty driver.
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   272
{
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   273
    tty->minor = minor;
fa3f66b783c1 Implemented reading direction of tty driver.
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   274
    tty->tx_read_idx = 0;
fa3f66b783c1 Implemented reading direction of tty driver.
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   275
    tty->tx_write_idx = 0;
fa3f66b783c1 Implemented reading direction of tty driver.
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   276
    tty->wakeup = 0;
fa3f66b783c1 Implemented reading direction of tty driver.
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   277
    tty->rx_read_idx = 0;
fa3f66b783c1 Implemented reading direction of tty driver.
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   278
    tty->rx_write_idx = 0;
fa3f66b783c1 Implemented reading direction of tty driver.
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   279
    init_timer(&tty->timer);
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   280
    tty->tty = NULL;
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   281
fa3f66b783c1 Implemented reading direction of tty driver.
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   282
    tty->dev = tty_register_device(tty_driver, tty->minor, NULL);
fa3f66b783c1 Implemented reading direction of tty driver.
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   283
    if (IS_ERR(tty->dev)) {
fa3f66b783c1 Implemented reading direction of tty driver.
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diff changeset
   284
        printk(KERN_ERR PFX "Failed to register tty device.\n");
fa3f66b783c1 Implemented reading direction of tty driver.
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   285
        return PTR_ERR(tty->dev);
fa3f66b783c1 Implemented reading direction of tty driver.
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diff changeset
   286
    }
fa3f66b783c1 Implemented reading direction of tty driver.
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    tty->timer.function = ec_tty_wakeup;
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    tty->timer.data = (unsigned long) tty;
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    tty->timer.expires = jiffies + 10;
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    add_timer(&tty->timer);
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    return 0;
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   293
}
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/*****************************************************************************/
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   296
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   297
void ec_tty_clear(ec_tty_t *tty)
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{
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    del_timer_sync(&tty->timer);
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    tty_unregister_device(tty_driver, tty->minor);
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}
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/******************************************************************************
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 * Device callbacks
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   305
 *****************************************************************************/
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   306
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static int ec_tty_open(struct tty_struct *tty, struct file *file)
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{
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    ec_tty_t *t;
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    int line = tty->index;
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   311
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#if EC_TTY_DEBUG >= 1
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    printk(KERN_INFO PFX "Opening line %i.\n", line);
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   314
#endif
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   315
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   316
	if (line < 0 || line >= EC_TTY_MAX_DEVICES) {
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   317
		return -ENXIO;
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   318
    }
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   319
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   320
    t = ttys[line];
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   321
    if (!t) {
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   322
        return -ENXIO;
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   323
    }
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   324
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   325
    if (t->tty) {
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   326
        return -EBUSY;
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   327
    }
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   328
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   329
    t->tty = tty;
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   330
    tty->driver_data = t;
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   331
    return 0;
1568
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   332
}
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   333
d9bbbe1883ab Register a TTY driver with one device.
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   334
/*****************************************************************************/
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   335
d9bbbe1883ab Register a TTY driver with one device.
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   336
static void ec_tty_close(struct tty_struct *tty, struct file *file)
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   337
{
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   338
    ec_tty_t *t = (ec_tty_t *) tty->driver_data;
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   339
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   340
#if EC_TTY_DEBUG >= 1
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   341
    printk(KERN_INFO PFX "Closing line %i.\n", tty->index);
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   342
#endif
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   343
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   344
    if (t->tty == tty) {
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   345
        t->tty = NULL;
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   346
    }
1568
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   347
}
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   348
d9bbbe1883ab Register a TTY driver with one device.
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   349
/*****************************************************************************/
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   350
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   351
static int ec_tty_write(
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   352
        struct tty_struct *tty,
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   353
        const unsigned char *buffer,
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   354
        int count
d9bbbe1883ab Register a TTY driver with one device.
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   355
        )
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   356
{
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   357
    ec_tty_t *t = (ec_tty_t *) tty->driver_data;
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   358
    unsigned int data_size, i;
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   359
    
1577
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   360
#if EC_TTY_DEBUG >= 1
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   361
    printk(KERN_INFO PFX "%s(count=%i)\n", __func__, count);
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   362
#endif
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   363
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diff changeset
   364
    if (count <= 0) {
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diff changeset
   365
        return 0;
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diff changeset
   366
    }
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   367
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   368
    data_size = min(ec_tty_tx_space(t), (unsigned int) count);
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   369
    for (i = 0; i < data_size; i++) {
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diff changeset
   370
        t->tx_buffer[t->tx_write_idx] = buffer[i];
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diff changeset
   371
        t->tx_write_idx = (t->tx_write_idx + 1) % EC_TTY_TX_BUFFER_SIZE;
17598f2332b6 Send direction works!
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diff changeset
   372
    }
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diff changeset
   373
1577
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   374
#if EC_TTY_DEBUG >= 1
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   375
    printk(KERN_INFO PFX "%s(): %u bytes written.\n", __func__, data_size);
1577
fa3f66b783c1 Implemented reading direction of tty driver.
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diff changeset
   376
#endif
1575
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diff changeset
   377
    return data_size;
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diff changeset
   378
}
17598f2332b6 Send direction works!
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diff changeset
   379
17598f2332b6 Send direction works!
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diff changeset
   380
/*****************************************************************************/
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diff changeset
   381
17598f2332b6 Send direction works!
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diff changeset
   382
static void ec_tty_put_char(struct tty_struct *tty, unsigned char ch)
17598f2332b6 Send direction works!
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diff changeset
   383
{
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   384
    ec_tty_t *t = (ec_tty_t *) tty->driver_data;
17598f2332b6 Send direction works!
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diff changeset
   385
1577
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
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diff changeset
   386
#if EC_TTY_DEBUG >= 1
1575
17598f2332b6 Send direction works!
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diff changeset
   387
    printk(KERN_INFO PFX "%s(): c=%02x.\n", __func__, (unsigned int) ch);
1577
fa3f66b783c1 Implemented reading direction of tty driver.
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parents: 1575
diff changeset
   388
#endif
1575
17598f2332b6 Send direction works!
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diff changeset
   389
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   390
    if (ec_tty_tx_space(t)) {
17598f2332b6 Send direction works!
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parents: 1572
diff changeset
   391
        t->tx_buffer[t->tx_write_idx] = ch;
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   392
        t->tx_write_idx = (t->tx_write_idx + 1) % EC_TTY_TX_BUFFER_SIZE;
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   393
    } else {
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   394
        printk(KERN_WARNING PFX "%s(): Dropped a byte!\n", __func__);
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   395
    }
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   396
}
17598f2332b6 Send direction works!
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diff changeset
   397
17598f2332b6 Send direction works!
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parents: 1572
diff changeset
   398
/*****************************************************************************/
17598f2332b6 Send direction works!
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parents: 1572
diff changeset
   399
17598f2332b6 Send direction works!
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parents: 1572
diff changeset
   400
static int ec_tty_write_room(struct tty_struct *tty)
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   401
{
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   402
    ec_tty_t *t = (ec_tty_t *) tty->driver_data;
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   403
    int ret = ec_tty_tx_space(t);
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   404
    
1577
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   405
#if EC_TTY_DEBUG >= 2
1575
17598f2332b6 Send direction works!
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parents: 1572
diff changeset
   406
    printk(KERN_INFO PFX "%s() = %i.\n", __func__, ret);
1577
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   407
#endif
1575
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   408
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   409
    return ret;
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   410
}
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   411
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   412
/*****************************************************************************/
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   413
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   414
static int ec_tty_chars_in_buffer(struct tty_struct *tty)
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   415
{
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   416
    ec_tty_t *t = (ec_tty_t *) tty->driver_data;
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   417
    int ret;
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   418
    
1577
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   419
#if EC_TTY_DEBUG >= 2
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   420
    printk(KERN_INFO PFX "%s().\n", __func__);
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   421
#endif
1575
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   422
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   423
    ret = ec_tty_tx_size(t);
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   424
1577
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   425
#if EC_TTY_DEBUG >= 2
1575
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   426
    printk(KERN_INFO PFX "%s() = %i.\n", __func__, ret);
1577
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   427
#endif
1575
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   428
    
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   429
    return ret;
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   430
}
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   431
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   432
/*****************************************************************************/
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   433
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   434
static void ec_tty_flush_buffer(struct tty_struct *tty)
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   435
{
1577
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   436
#if EC_TTY_DEBUG >= 2
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   437
    printk(KERN_INFO PFX "%s().\n", __func__);
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   438
#endif
1575
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   439
}
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   440
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   441
/*****************************************************************************/
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   442
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   443
static int ec_tty_ioctl(struct tty_struct *tty, struct file *file,
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   444
		    unsigned int cmd, unsigned long arg)
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   445
{
1577
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   446
#if EC_TTY_DEBUG >= 2
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   447
    printk(KERN_INFO PFX "%s().\n", __func__);
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   448
#endif
1575
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   449
    return -ENOTTY;
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   450
}
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   451
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   452
/*****************************************************************************/
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   453
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   454
static void ec_tty_throttle(struct tty_struct *tty)
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   455
{
1577
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   456
#if EC_TTY_DEBUG >= 2
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   457
    printk(KERN_INFO PFX "%s().\n", __func__);
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   458
#endif
1575
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   459
}
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   460
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   461
/*****************************************************************************/
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   462
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   463
static void ec_tty_unthrottle(struct tty_struct *tty)
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   464
{
1577
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   465
#if EC_TTY_DEBUG >= 2
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   466
    printk(KERN_INFO PFX "%s().\n", __func__);
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   467
#endif
1575
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   468
}
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   469
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   470
/*****************************************************************************/
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   471
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   472
static void ec_tty_set_termios(struct tty_struct *tty,
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   473
			   struct ktermios *old_termios)
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   474
{
1577
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   475
#if EC_TTY_DEBUG >= 2
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   476
    printk(KERN_INFO PFX "%s().\n", __func__);
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   477
#endif
1575
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   478
}
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   479
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   480
/*****************************************************************************/
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   481
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   482
static void ec_tty_stop(struct tty_struct *tty)
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   483
{
1577
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   484
#if EC_TTY_DEBUG >= 2
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   485
    printk(KERN_INFO PFX "%s().\n", __func__);
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   486
#endif
1575
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   487
}
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   488
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   489
/*****************************************************************************/
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   490
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   491
static void ec_tty_start(struct tty_struct *tty)
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   492
{
1577
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   493
#if EC_TTY_DEBUG >= 2
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   494
    printk(KERN_INFO PFX "%s().\n", __func__);
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   495
#endif
1575
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   496
}
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   497
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   498
/*****************************************************************************/
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   499
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   500
static void ec_tty_hangup(struct tty_struct *tty)
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   501
{
1577
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   502
#if EC_TTY_DEBUG >= 2
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   503
    printk(KERN_INFO PFX "%s().\n", __func__);
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   504
#endif
1575
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   505
}
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   506
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   507
/*****************************************************************************/
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   508
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   509
static void ec_tty_break(struct tty_struct *tty, int break_state)
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   510
{
1577
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   511
#if EC_TTY_DEBUG >= 2
1575
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   512
    printk(KERN_INFO PFX "%s(break_state = %i).\n", __func__, break_state);
1577
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   513
#endif
1575
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   514
}
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   515
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   516
/*****************************************************************************/
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   517
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   518
static void ec_tty_send_xchar(struct tty_struct *tty, char ch)
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   519
{
1577
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   520
#if EC_TTY_DEBUG >= 2
1575
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   521
    printk(KERN_INFO PFX "%s(ch=%02x).\n", __func__, (unsigned int) ch);
1577
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   522
#endif
1575
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   523
}
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   524
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   525
/*****************************************************************************/
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   526
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   527
static void ec_tty_wait_until_sent(struct tty_struct *tty, int timeout)
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   528
{
1577
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   529
#if EC_TTY_DEBUG >= 2
1575
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   530
    printk(KERN_INFO PFX "%s(timeout=%i).\n", __func__, timeout);
1577
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   531
#endif
1575
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   532
}
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   533
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   534
/*****************************************************************************/
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   535
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   536
static int ec_tty_tiocmget(struct tty_struct *tty, struct file *file)
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   537
{
1577
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   538
#if EC_TTY_DEBUG >= 2
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   539
    printk(KERN_INFO PFX "%s().\n", __func__);
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   540
#endif
1575
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   541
    return -EBUSY;
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   542
}
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   543
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   544
/*****************************************************************************/
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   545
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   546
static int ec_tty_tiocmset(struct tty_struct *tty, struct file *file,
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   547
		    unsigned int set, unsigned int clear)
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   548
{
1577
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   549
#if EC_TTY_DEBUG >= 2
1575
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   550
    printk(KERN_INFO PFX "%s(set=%u, clear=%u).\n", __func__, set, clear);
1577
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   551
#endif
1575
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   552
    return -EBUSY;
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   553
}
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   554
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   555
/*****************************************************************************/
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   556
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   557
static const struct tty_operations ec_tty_ops = {
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   558
    .open = ec_tty_open,
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   559
    .close = ec_tty_close,
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   560
    .write = ec_tty_write,
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   561
	.put_char = ec_tty_put_char,
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   562
	.write_room = ec_tty_write_room,
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   563
	.chars_in_buffer = ec_tty_chars_in_buffer,
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   564
	.flush_buffer = ec_tty_flush_buffer,
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   565
	.ioctl = ec_tty_ioctl,
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   566
	.throttle = ec_tty_throttle,
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   567
	.unthrottle = ec_tty_unthrottle,
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   568
	.set_termios = ec_tty_set_termios,
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   569
	.stop = ec_tty_stop,
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   570
	.start = ec_tty_start,
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   571
	.hangup = ec_tty_hangup,
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   572
	.break_ctl = ec_tty_break,
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   573
	.send_xchar = ec_tty_send_xchar,
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   574
	.wait_until_sent = ec_tty_wait_until_sent,
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   575
	.tiocmget = ec_tty_tiocmget,
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   576
	.tiocmset = ec_tty_tiocmset,
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   577
};
1568
d9bbbe1883ab Register a TTY driver with one device.
Florian Pose <fp@igh-essen.com>
parents: 1565
diff changeset
   578
1569
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   579
/******************************************************************************
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   580
 * Public functions and methods
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   581
 *****************************************************************************/
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   582
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   583
ec_tty_t *ectty_create(void)
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   584
{
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   585
    ec_tty_t *tty;
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   586
    int minor, ret;
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   587
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   588
    if (down_interruptible(&tty_sem)) {
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   589
        return ERR_PTR(-EINTR);
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   590
    }
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   591
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   592
    for (minor = 0; minor < EC_TTY_MAX_DEVICES; minor++) {
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   593
        if (!ttys[minor]) {
1575
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   594
            printk(KERN_INFO PFX "Creating TTY interface %i.\n", minor);
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   595
1569
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   596
            tty = kmalloc(sizeof(ec_tty_t), GFP_KERNEL);
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   597
            if (!tty) {
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   598
                up(&tty_sem);
1570
7a2a58107dd8 Use own PFX for printk.
Florian Pose <fp@igh-essen.com>
parents: 1569
diff changeset
   599
                printk(KERN_ERR PFX "Failed to allocate memory.\n");
1569
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   600
                return ERR_PTR(-ENOMEM);
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   601
            }
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   602
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   603
            ret = ec_tty_init(tty, minor);
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   604
            if (ret) {
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   605
                up(&tty_sem);
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   606
                kfree(tty);
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   607
                return ERR_PTR(ret);
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   608
            }
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   609
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   610
            ttys[minor] = tty;
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   611
            up(&tty_sem);
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   612
            return tty;
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   613
        }
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   614
    }
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   615
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   616
    up(&tty_sem);
1570
7a2a58107dd8 Use own PFX for printk.
Florian Pose <fp@igh-essen.com>
parents: 1569
diff changeset
   617
    printk(KERN_ERR PFX "No free interfaces avaliable.\n");
1569
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   618
    return ERR_PTR(-EBUSY);
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   619
}
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   620
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   621
/*****************************************************************************/
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   622
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   623
void ectty_free(ec_tty_t *tty)
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   624
{
1575
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   625
    printk(KERN_INFO PFX "Freeing TTY interface %i.\n", tty->minor);
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   626
1569
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   627
    ec_tty_clear(tty);
1570
7a2a58107dd8 Use own PFX for printk.
Florian Pose <fp@igh-essen.com>
parents: 1569
diff changeset
   628
    ttys[tty->minor] = NULL;
1569
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   629
    kfree(tty);
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   630
}
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   631
1568
d9bbbe1883ab Register a TTY driver with one device.
Florian Pose <fp@igh-essen.com>
parents: 1565
diff changeset
   632
/*****************************************************************************/
d9bbbe1883ab Register a TTY driver with one device.
Florian Pose <fp@igh-essen.com>
parents: 1565
diff changeset
   633
1575
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   634
unsigned int ectty_tx_data(ec_tty_t *tty, uint8_t *buffer, size_t size)
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   635
{
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   636
    unsigned int data_size = min(ec_tty_tx_size(tty), size), i;
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   637
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   638
    if (data_size)  {
1577
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   639
#if EC_TTY_DEBUG >= 1
1575
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   640
        printk(KERN_INFO PFX "Fetching %u bytes to send.\n", data_size);
1577
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   641
#endif
1575
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   642
    }
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   643
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   644
    for (i = 0; i < data_size; i++) {
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   645
        buffer[i] = tty->tx_buffer[tty->tx_read_idx];
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   646
        tty->tx_read_idx = (tty->tx_read_idx + 1) % EC_TTY_TX_BUFFER_SIZE;
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   647
    }
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   648
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   649
    if (data_size) {
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   650
        tty->wakeup = 1;
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   651
    }
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   652
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   653
    return data_size;
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   654
}
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   655
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   656
/*****************************************************************************/
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   657
1577
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   658
void ectty_rx_data(ec_tty_t *tty, const uint8_t *buffer, size_t size)
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   659
{
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   660
    size_t to_recv;
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   661
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   662
    if (size)  {
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   663
        unsigned int i;
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   664
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   665
#if EC_TTY_DEBUG >= 1
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   666
        printk(KERN_INFO PFX "Received %u bytes.\n", size);
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   667
#endif
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   668
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   669
        to_recv = min(ec_tty_rx_space(tty), size);
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   670
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   671
        if (to_recv < size) {
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   672
            printk(KERN_WARNING PFX "Dropping %u bytes.\n", size - to_recv);
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   673
        }
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   674
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   675
        for (i = 0; i < size; i++) {
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   676
            tty->rx_buffer[tty->rx_write_idx] = buffer[i];
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   677
            tty->rx_write_idx = (tty->rx_write_idx + 1) % EC_TTY_RX_BUFFER_SIZE;
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   678
        }
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   679
    }
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   680
}
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   681
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   682
/*****************************************************************************/
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   683
1565
8c526cfe1399 Base files for new TTY driver.
Florian Pose <fp@igh-essen.com>
parents:
diff changeset
   684
/** \cond */
8c526cfe1399 Base files for new TTY driver.
Florian Pose <fp@igh-essen.com>
parents:
diff changeset
   685
8c526cfe1399 Base files for new TTY driver.
Florian Pose <fp@igh-essen.com>
parents:
diff changeset
   686
module_init(ec_tty_init_module);
8c526cfe1399 Base files for new TTY driver.
Florian Pose <fp@igh-essen.com>
parents:
diff changeset
   687
module_exit(ec_tty_cleanup_module);
8c526cfe1399 Base files for new TTY driver.
Florian Pose <fp@igh-essen.com>
parents:
diff changeset
   688
1569
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   689
EXPORT_SYMBOL(ectty_create);
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   690
EXPORT_SYMBOL(ectty_free);
1575
17598f2332b6 Send direction works!
Florian Pose <fp@igh-essen.com>
parents: 1572
diff changeset
   691
EXPORT_SYMBOL(ectty_tx_data);
1577
fa3f66b783c1 Implemented reading direction of tty driver.
Florian Pose <fp@igh-essen.com>
parents: 1575
diff changeset
   692
EXPORT_SYMBOL(ectty_rx_data);
1569
61f5f4c35883 Interface management.
Florian Pose <fp@igh-essen.com>
parents: 1568
diff changeset
   693
1565
8c526cfe1399 Base files for new TTY driver.
Florian Pose <fp@igh-essen.com>
parents:
diff changeset
   694
/** \endcond */
8c526cfe1399 Base files for new TTY driver.
Florian Pose <fp@igh-essen.com>
parents:
diff changeset
   695
8c526cfe1399 Base files for new TTY driver.
Florian Pose <fp@igh-essen.com>
parents:
diff changeset
   696
/*****************************************************************************/