701 строка
16 KiB
C
701 строка
16 KiB
C
/*
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* interface to user space for the gigaset driver
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*
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* Copyright (c) 2004 by Hansjoerg Lipp <hjlipp@web.de>
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*
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* =====================================================================
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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* =====================================================================
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*/
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#include "gigaset.h"
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#include <linux/gigaset_dev.h>
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#include <linux/tty.h>
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#include <linux/tty_flip.h>
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/*** our ioctls ***/
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static int if_lock(struct cardstate *cs, int *arg)
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{
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int cmd = *arg;
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gig_dbg(DEBUG_IF, "%u: if_lock (%d)", cs->minor_index, cmd);
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if (cmd > 1)
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return -EINVAL;
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if (cmd < 0) {
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*arg = cs->mstate == MS_LOCKED;
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return 0;
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}
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if (!cmd && cs->mstate == MS_LOCKED && cs->connected) {
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cs->ops->set_modem_ctrl(cs, 0, TIOCM_DTR|TIOCM_RTS);
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cs->ops->baud_rate(cs, B115200);
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cs->ops->set_line_ctrl(cs, CS8);
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cs->control_state = TIOCM_DTR|TIOCM_RTS;
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}
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cs->waiting = 1;
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if (!gigaset_add_event(cs, &cs->at_state, EV_IF_LOCK,
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NULL, cmd, NULL)) {
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cs->waiting = 0;
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return -ENOMEM;
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}
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gig_dbg(DEBUG_CMD, "scheduling IF_LOCK");
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gigaset_schedule_event(cs);
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wait_event(cs->waitqueue, !cs->waiting);
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if (cs->cmd_result >= 0) {
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*arg = cs->cmd_result;
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return 0;
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}
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return cs->cmd_result;
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}
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static int if_version(struct cardstate *cs, unsigned arg[4])
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{
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static const unsigned version[4] = GIG_VERSION;
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static const unsigned compat[4] = GIG_COMPAT;
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unsigned cmd = arg[0];
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gig_dbg(DEBUG_IF, "%u: if_version (%d)", cs->minor_index, cmd);
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switch (cmd) {
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case GIGVER_DRIVER:
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memcpy(arg, version, sizeof version);
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return 0;
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case GIGVER_COMPAT:
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memcpy(arg, compat, sizeof compat);
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return 0;
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case GIGVER_FWBASE:
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cs->waiting = 1;
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if (!gigaset_add_event(cs, &cs->at_state, EV_IF_VER,
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NULL, 0, arg)) {
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cs->waiting = 0;
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return -ENOMEM;
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}
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gig_dbg(DEBUG_CMD, "scheduling IF_VER");
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gigaset_schedule_event(cs);
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wait_event(cs->waitqueue, !cs->waiting);
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if (cs->cmd_result >= 0)
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return 0;
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return cs->cmd_result;
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default:
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return -EINVAL;
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}
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}
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static int if_config(struct cardstate *cs, int *arg)
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{
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gig_dbg(DEBUG_IF, "%u: if_config (%d)", cs->minor_index, *arg);
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if (*arg != 1)
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return -EINVAL;
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if (cs->mstate != MS_LOCKED)
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return -EBUSY;
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if (!cs->connected) {
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pr_err("%s: not connected\n", __func__);
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return -ENODEV;
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}
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*arg = 0;
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return gigaset_enterconfigmode(cs);
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}
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/*** the terminal driver ***/
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/* stolen from usbserial and some other tty drivers */
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static int if_open(struct tty_struct *tty, struct file *filp);
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static void if_close(struct tty_struct *tty, struct file *filp);
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static int if_ioctl(struct tty_struct *tty, struct file *file,
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unsigned int cmd, unsigned long arg);
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static int if_write_room(struct tty_struct *tty);
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static int if_chars_in_buffer(struct tty_struct *tty);
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static void if_throttle(struct tty_struct *tty);
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static void if_unthrottle(struct tty_struct *tty);
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static void if_set_termios(struct tty_struct *tty, struct ktermios *old);
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static int if_tiocmget(struct tty_struct *tty, struct file *file);
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static int if_tiocmset(struct tty_struct *tty, struct file *file,
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unsigned int set, unsigned int clear);
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static int if_write(struct tty_struct *tty,
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const unsigned char *buf, int count);
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static const struct tty_operations if_ops = {
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.open = if_open,
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.close = if_close,
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.ioctl = if_ioctl,
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.write = if_write,
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.write_room = if_write_room,
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.chars_in_buffer = if_chars_in_buffer,
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.set_termios = if_set_termios,
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.throttle = if_throttle,
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.unthrottle = if_unthrottle,
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.tiocmget = if_tiocmget,
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.tiocmset = if_tiocmset,
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};
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static int if_open(struct tty_struct *tty, struct file *filp)
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{
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struct cardstate *cs;
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unsigned long flags;
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gig_dbg(DEBUG_IF, "%d+%d: %s()",
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tty->driver->minor_start, tty->index, __func__);
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tty->driver_data = NULL;
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cs = gigaset_get_cs_by_tty(tty);
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if (!cs || !try_module_get(cs->driver->owner))
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return -ENODEV;
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if (mutex_lock_interruptible(&cs->mutex))
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return -ERESTARTSYS; // FIXME -EINTR?
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tty->driver_data = cs;
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++cs->open_count;
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if (cs->open_count == 1) {
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spin_lock_irqsave(&cs->lock, flags);
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cs->tty = tty;
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spin_unlock_irqrestore(&cs->lock, flags);
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tty->low_latency = 1; //FIXME test
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}
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mutex_unlock(&cs->mutex);
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return 0;
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}
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static void if_close(struct tty_struct *tty, struct file *filp)
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{
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struct cardstate *cs;
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unsigned long flags;
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cs = (struct cardstate *) tty->driver_data;
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if (!cs) {
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pr_err("%s: no cardstate\n", __func__);
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return;
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}
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gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
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mutex_lock(&cs->mutex);
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if (!cs->open_count)
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dev_warn(cs->dev, "%s: device not opened\n", __func__);
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else {
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if (!--cs->open_count) {
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spin_lock_irqsave(&cs->lock, flags);
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cs->tty = NULL;
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spin_unlock_irqrestore(&cs->lock, flags);
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}
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}
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mutex_unlock(&cs->mutex);
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module_put(cs->driver->owner);
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}
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static int if_ioctl(struct tty_struct *tty, struct file *file,
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unsigned int cmd, unsigned long arg)
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{
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struct cardstate *cs;
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int retval = -ENODEV;
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int int_arg;
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unsigned char buf[6];
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unsigned version[4];
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cs = (struct cardstate *) tty->driver_data;
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if (!cs) {
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pr_err("%s: no cardstate\n", __func__);
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return -ENODEV;
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}
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gig_dbg(DEBUG_IF, "%u: %s(0x%x)", cs->minor_index, __func__, cmd);
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if (mutex_lock_interruptible(&cs->mutex))
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return -ERESTARTSYS; // FIXME -EINTR?
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if (!cs->open_count)
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dev_warn(cs->dev, "%s: device not opened\n", __func__);
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else {
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retval = 0;
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switch (cmd) {
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case GIGASET_REDIR:
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retval = get_user(int_arg, (int __user *) arg);
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if (retval >= 0)
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retval = if_lock(cs, &int_arg);
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if (retval >= 0)
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retval = put_user(int_arg, (int __user *) arg);
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break;
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case GIGASET_CONFIG:
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retval = get_user(int_arg, (int __user *) arg);
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if (retval >= 0)
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retval = if_config(cs, &int_arg);
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if (retval >= 0)
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retval = put_user(int_arg, (int __user *) arg);
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break;
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case GIGASET_BRKCHARS:
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//FIXME test if MS_LOCKED
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if (!cs->connected) {
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gig_dbg(DEBUG_ANY,
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"can't communicate with unplugged device");
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retval = -ENODEV;
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break;
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}
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retval = copy_from_user(&buf,
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(const unsigned char __user *) arg, 6)
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? -EFAULT : 0;
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if (retval >= 0) {
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gigaset_dbg_buffer(DEBUG_IF, "GIGASET_BRKCHARS",
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6, (const unsigned char *) arg);
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retval = cs->ops->brkchars(cs, buf);
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}
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break;
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case GIGASET_VERSION:
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retval = copy_from_user(version,
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(unsigned __user *) arg, sizeof version)
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? -EFAULT : 0;
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if (retval >= 0)
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retval = if_version(cs, version);
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if (retval >= 0)
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retval = copy_to_user((unsigned __user *) arg,
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version, sizeof version)
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? -EFAULT : 0;
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break;
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default:
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gig_dbg(DEBUG_ANY, "%s: arg not supported - 0x%04x",
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__func__, cmd);
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retval = -ENOIOCTLCMD;
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}
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}
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mutex_unlock(&cs->mutex);
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return retval;
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}
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static int if_tiocmget(struct tty_struct *tty, struct file *file)
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{
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struct cardstate *cs;
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int retval;
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cs = (struct cardstate *) tty->driver_data;
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if (!cs) {
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pr_err("%s: no cardstate\n", __func__);
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return -ENODEV;
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}
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gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
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if (mutex_lock_interruptible(&cs->mutex))
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return -ERESTARTSYS; // FIXME -EINTR?
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// FIXME read from device?
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retval = cs->control_state & (TIOCM_RTS|TIOCM_DTR);
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mutex_unlock(&cs->mutex);
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return retval;
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}
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static int if_tiocmset(struct tty_struct *tty, struct file *file,
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unsigned int set, unsigned int clear)
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{
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struct cardstate *cs;
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int retval;
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unsigned mc;
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cs = (struct cardstate *) tty->driver_data;
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if (!cs) {
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pr_err("%s: no cardstate\n", __func__);
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return -ENODEV;
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}
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gig_dbg(DEBUG_IF, "%u: %s(0x%x, 0x%x)",
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cs->minor_index, __func__, set, clear);
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if (mutex_lock_interruptible(&cs->mutex))
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return -ERESTARTSYS; // FIXME -EINTR?
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if (!cs->connected) {
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gig_dbg(DEBUG_ANY, "can't communicate with unplugged device");
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retval = -ENODEV;
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} else {
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mc = (cs->control_state | set) & ~clear & (TIOCM_RTS|TIOCM_DTR);
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retval = cs->ops->set_modem_ctrl(cs, cs->control_state, mc);
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cs->control_state = mc;
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}
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mutex_unlock(&cs->mutex);
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return retval;
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}
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static int if_write(struct tty_struct *tty, const unsigned char *buf, int count)
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{
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struct cardstate *cs;
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int retval = -ENODEV;
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cs = (struct cardstate *) tty->driver_data;
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if (!cs) {
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pr_err("%s: no cardstate\n", __func__);
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return -ENODEV;
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}
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gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
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if (mutex_lock_interruptible(&cs->mutex))
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return -ERESTARTSYS; // FIXME -EINTR?
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if (!cs->open_count)
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dev_warn(cs->dev, "%s: device not opened\n", __func__);
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else if (cs->mstate != MS_LOCKED) {
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dev_warn(cs->dev, "can't write to unlocked device\n");
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retval = -EBUSY;
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} else if (!cs->connected) {
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gig_dbg(DEBUG_ANY, "can't write to unplugged device");
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retval = -EBUSY; //FIXME
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} else {
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retval = cs->ops->write_cmd(cs, buf, count,
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&cs->if_wake_tasklet);
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}
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mutex_unlock(&cs->mutex);
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return retval;
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}
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static int if_write_room(struct tty_struct *tty)
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{
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struct cardstate *cs;
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int retval = -ENODEV;
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cs = (struct cardstate *) tty->driver_data;
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if (!cs) {
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pr_err("%s: no cardstate\n", __func__);
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return -ENODEV;
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}
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gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
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if (mutex_lock_interruptible(&cs->mutex))
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return -ERESTARTSYS; // FIXME -EINTR?
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if (!cs->open_count)
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dev_warn(cs->dev, "%s: device not opened\n", __func__);
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else if (cs->mstate != MS_LOCKED) {
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dev_warn(cs->dev, "can't write to unlocked device\n");
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retval = -EBUSY;
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} else if (!cs->connected) {
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gig_dbg(DEBUG_ANY, "can't write to unplugged device");
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retval = -EBUSY; //FIXME
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} else
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retval = cs->ops->write_room(cs);
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mutex_unlock(&cs->mutex);
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return retval;
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}
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static int if_chars_in_buffer(struct tty_struct *tty)
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{
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struct cardstate *cs;
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int retval = -ENODEV;
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cs = (struct cardstate *) tty->driver_data;
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if (!cs) {
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pr_err("%s: no cardstate\n", __func__);
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return -ENODEV;
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}
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gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
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if (mutex_lock_interruptible(&cs->mutex))
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return -ERESTARTSYS; // FIXME -EINTR?
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if (!cs->open_count)
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dev_warn(cs->dev, "%s: device not opened\n", __func__);
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else if (cs->mstate != MS_LOCKED) {
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dev_warn(cs->dev, "can't write to unlocked device\n");
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retval = -EBUSY;
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} else if (!cs->connected) {
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gig_dbg(DEBUG_ANY, "can't write to unplugged device");
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retval = -EBUSY; //FIXME
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} else
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retval = cs->ops->chars_in_buffer(cs);
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mutex_unlock(&cs->mutex);
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return retval;
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}
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static void if_throttle(struct tty_struct *tty)
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{
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struct cardstate *cs;
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cs = (struct cardstate *) tty->driver_data;
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if (!cs) {
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pr_err("%s: no cardstate\n", __func__);
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return;
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}
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gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
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mutex_lock(&cs->mutex);
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if (!cs->open_count)
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dev_warn(cs->dev, "%s: device not opened\n", __func__);
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else {
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//FIXME
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}
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mutex_unlock(&cs->mutex);
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}
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static void if_unthrottle(struct tty_struct *tty)
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{
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struct cardstate *cs;
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cs = (struct cardstate *) tty->driver_data;
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if (!cs) {
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pr_err("%s: no cardstate\n", __func__);
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return;
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}
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gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
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mutex_lock(&cs->mutex);
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if (!cs->open_count)
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dev_warn(cs->dev, "%s: device not opened\n", __func__);
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else {
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//FIXME
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}
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mutex_unlock(&cs->mutex);
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}
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static void if_set_termios(struct tty_struct *tty, struct ktermios *old)
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{
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struct cardstate *cs;
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unsigned int iflag;
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unsigned int cflag;
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unsigned int old_cflag;
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unsigned int control_state, new_state;
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cs = (struct cardstate *) tty->driver_data;
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if (!cs) {
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pr_err("%s: no cardstate\n", __func__);
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return;
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}
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gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__);
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mutex_lock(&cs->mutex);
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if (!cs->open_count) {
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dev_warn(cs->dev, "%s: device not opened\n", __func__);
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goto out;
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}
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if (!cs->connected) {
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gig_dbg(DEBUG_ANY, "can't communicate with unplugged device");
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goto out;
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}
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// stolen from mct_u232.c
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iflag = tty->termios->c_iflag;
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cflag = tty->termios->c_cflag;
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old_cflag = old ? old->c_cflag : cflag; //FIXME?
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gig_dbg(DEBUG_IF, "%u: iflag %x cflag %x old %x",
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cs->minor_index, iflag, cflag, old_cflag);
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/* get a local copy of the current port settings */
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control_state = cs->control_state;
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/*
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* Update baud rate.
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* Do not attempt to cache old rates and skip settings,
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* disconnects screw such tricks up completely.
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* Premature optimization is the root of all evil.
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*/
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|
|
/* reassert DTR and (maybe) RTS on transition from B0 */
|
|
if ((old_cflag & CBAUD) == B0) {
|
|
new_state = control_state | TIOCM_DTR;
|
|
/* don't set RTS if using hardware flow control */
|
|
if (!(old_cflag & CRTSCTS))
|
|
new_state |= TIOCM_RTS;
|
|
gig_dbg(DEBUG_IF, "%u: from B0 - set DTR%s",
|
|
cs->minor_index,
|
|
(new_state & TIOCM_RTS) ? " only" : "/RTS");
|
|
cs->ops->set_modem_ctrl(cs, control_state, new_state);
|
|
control_state = new_state;
|
|
}
|
|
|
|
cs->ops->baud_rate(cs, cflag & CBAUD);
|
|
|
|
if ((cflag & CBAUD) == B0) {
|
|
/* Drop RTS and DTR */
|
|
gig_dbg(DEBUG_IF, "%u: to B0 - drop DTR/RTS", cs->minor_index);
|
|
new_state = control_state & ~(TIOCM_DTR | TIOCM_RTS);
|
|
cs->ops->set_modem_ctrl(cs, control_state, new_state);
|
|
control_state = new_state;
|
|
}
|
|
|
|
/*
|
|
* Update line control register (LCR)
|
|
*/
|
|
|
|
cs->ops->set_line_ctrl(cs, cflag);
|
|
|
|
/* save off the modified port settings */
|
|
cs->control_state = control_state;
|
|
|
|
out:
|
|
mutex_unlock(&cs->mutex);
|
|
}
|
|
|
|
|
|
/* wakeup tasklet for the write operation */
|
|
static void if_wake(unsigned long data)
|
|
{
|
|
struct cardstate *cs = (struct cardstate *) data;
|
|
|
|
if (cs->tty)
|
|
tty_wakeup(cs->tty);
|
|
}
|
|
|
|
/*** interface to common ***/
|
|
|
|
void gigaset_if_init(struct cardstate *cs)
|
|
{
|
|
struct gigaset_driver *drv;
|
|
|
|
drv = cs->driver;
|
|
if (!drv->have_tty)
|
|
return;
|
|
|
|
tasklet_init(&cs->if_wake_tasklet, &if_wake, (unsigned long) cs);
|
|
|
|
mutex_lock(&cs->mutex);
|
|
cs->tty_dev = tty_register_device(drv->tty, cs->minor_index, NULL);
|
|
|
|
if (!IS_ERR(cs->tty_dev))
|
|
dev_set_drvdata(cs->tty_dev, cs);
|
|
else {
|
|
dev_warn(cs->dev,
|
|
"could not register device to the tty subsystem\n");
|
|
cs->tty_dev = NULL;
|
|
}
|
|
mutex_unlock(&cs->mutex);
|
|
}
|
|
|
|
void gigaset_if_free(struct cardstate *cs)
|
|
{
|
|
struct gigaset_driver *drv;
|
|
|
|
drv = cs->driver;
|
|
if (!drv->have_tty)
|
|
return;
|
|
|
|
tasklet_disable(&cs->if_wake_tasklet);
|
|
tasklet_kill(&cs->if_wake_tasklet);
|
|
cs->tty_dev = NULL;
|
|
tty_unregister_device(drv->tty, cs->minor_index);
|
|
}
|
|
|
|
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)
|
|
gig_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)
|
|
*/
|
|
void gigaset_if_initdriver(struct gigaset_driver *drv, const char *procname,
|
|
const char *devname)
|
|
{
|
|
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_DYNAMIC_DEV;
|
|
|
|
tty->driver_name = procname;
|
|
tty->name = devname;
|
|
tty->minor_start = drv->minor;
|
|
tty->num = drv->minors;
|
|
|
|
tty->owner = THIS_MODULE;
|
|
|
|
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) {
|
|
pr_err("error %d registering tty driver\n", ret);
|
|
goto error;
|
|
}
|
|
gig_dbg(DEBUG_IF, "tty driver initialized");
|
|
drv->have_tty = 1;
|
|
return;
|
|
|
|
enomem:
|
|
pr_err("out of memory\n");
|
|
error:
|
|
if (drv->tty)
|
|
put_tty_driver(drv->tty);
|
|
}
|
|
|
|
void gigaset_if_freedriver(struct gigaset_driver *drv)
|
|
{
|
|
if (!drv->have_tty)
|
|
return;
|
|
|
|
drv->have_tty = 0;
|
|
tty_unregister_driver(drv->tty);
|
|
put_tty_driver(drv->tty);
|
|
}
|