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common.c

/*
 * Stuff used by all variants of the driver
 *
 * Copyright (c) 2001 by Stefan Eilers,
 *                       Hansjoerg Lipp <hjlipp@web.de>,
 *                       Tilman Schmidt <tilman@imap.cc>.
 *
 * =====================================================================
 *    This program is free software; you can redistribute it and/or
 *    modify it under the terms of the GNU General Public License as
 *    published by the Free Software Foundation; either version 2 of
 *    the License, or (at your option) any later version.
 * =====================================================================
 */

#include "gigaset.h"
#include <linux/ctype.h>
#include <linux/module.h>
#include <linux/moduleparam.h>

/* Version Information */
#define DRIVER_AUTHOR "Hansjoerg Lipp <hjlipp@web.de>, Tilman Schmidt <tilman@imap.cc>, Stefan Eilers"
#define DRIVER_DESC "Driver for Gigaset 307x"

/* Module parameters */
int gigaset_debuglevel = DEBUG_DEFAULT;
EXPORT_SYMBOL_GPL(gigaset_debuglevel);
module_param_named(debug, gigaset_debuglevel, int, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(debug, "debug level");

/* driver state flags */
#define VALID_MINOR     0x01
#define VALID_ID  0x02
#define ASSIGNED  0x04

void gigaset_dbg_buffer(enum debuglevel level, const unsigned char *msg,
                  size_t len, const unsigned char *buf)
{
      unsigned char outbuf[80];
      unsigned char c;
      size_t space = sizeof outbuf - 1;
      unsigned char *out = outbuf;
      size_t numin = len;

      while (numin--) {
            c = *buf++;
            if (c == '~' || c == '^' || c == '\\') {
                  if (!space--)
                        break;
                  *out++ = '\\';
            }
            if (c & 0x80) {
                  if (!space--)
                        break;
                  *out++ = '~';
                  c ^= 0x80;
            }
            if (c < 0x20 || c == 0x7f) {
                  if (!space--)
                        break;
                  *out++ = '^';
                  c ^= 0x40;
            }
            if (!space--)
                  break;
            *out++ = c;
      }
      *out = 0;

      gig_dbg(level, "%s (%u bytes): %s", msg, (unsigned) len, outbuf);
}
EXPORT_SYMBOL_GPL(gigaset_dbg_buffer);

static int setflags(struct cardstate *cs, unsigned flags, unsigned delay)
{
      int r;

      r = cs->ops->set_modem_ctrl(cs, cs->control_state, flags);
      cs->control_state = flags;
      if (r < 0)
            return r;

      if (delay) {
            set_current_state(TASK_INTERRUPTIBLE);
            schedule_timeout(delay * HZ / 1000);
      }

      return 0;
}

int gigaset_enterconfigmode(struct cardstate *cs)
{
      int i, r;

      cs->control_state = TIOCM_RTS; //FIXME

      r = setflags(cs, TIOCM_DTR, 200);
      if (r < 0)
            goto error;
      r = setflags(cs, 0, 200);
      if (r < 0)
            goto error;
      for (i = 0; i < 5; ++i) {
            r = setflags(cs, TIOCM_RTS, 100);
            if (r < 0)
                  goto error;
            r = setflags(cs, 0, 100);
            if (r < 0)
                  goto error;
      }
      r = setflags(cs, TIOCM_RTS|TIOCM_DTR, 800);
      if (r < 0)
            goto error;

      return 0;

error:
      dev_err(cs->dev, "error %d on setuartbits\n", -r);
      cs->control_state = TIOCM_RTS|TIOCM_DTR; // FIXME is this a good value?
      cs->ops->set_modem_ctrl(cs, 0, TIOCM_RTS|TIOCM_DTR);

      return -1; //r
}

static int test_timeout(struct at_state_t *at_state)
{
      if (!at_state->timer_expires)
            return 0;

      if (--at_state->timer_expires) {
            gig_dbg(DEBUG_MCMD, "decreased timer of %p to %lu",
                  at_state, at_state->timer_expires);
            return 0;
      }

      if (!gigaset_add_event(at_state->cs, at_state, EV_TIMEOUT, NULL,
                         at_state->timer_index, NULL)) {
            //FIXME what should we do?
      }

      return 1;
}

static void timer_tick(unsigned long data)
{
      struct cardstate *cs = (struct cardstate *) data;
      unsigned long flags;
      unsigned channel;
      struct at_state_t *at_state;
      int timeout = 0;

      spin_lock_irqsave(&cs->lock, flags);

      for (channel = 0; channel < cs->channels; ++channel)
            if (test_timeout(&cs->bcs[channel].at_state))
                  timeout = 1;

      if (test_timeout(&cs->at_state))
            timeout = 1;

      list_for_each_entry(at_state, &cs->temp_at_states, list)
            if (test_timeout(at_state))
                  timeout = 1;

      if (cs->running) {
            mod_timer(&cs->timer, jiffies + msecs_to_jiffies(GIG_TICK));
            if (timeout) {
                  gig_dbg(DEBUG_CMD, "scheduling timeout");
                  tasklet_schedule(&cs->event_tasklet);
            }
      }

      spin_unlock_irqrestore(&cs->lock, flags);
}

int gigaset_get_channel(struct bc_state *bcs)
{
      unsigned long flags;

      spin_lock_irqsave(&bcs->cs->lock, flags);
      if (bcs->use_count) {
            gig_dbg(DEBUG_ANY, "could not allocate channel %d",
                  bcs->channel);
            spin_unlock_irqrestore(&bcs->cs->lock, flags);
            return 0;
      }
      ++bcs->use_count;
      bcs->busy = 1;
      gig_dbg(DEBUG_ANY, "allocated channel %d", bcs->channel);
      spin_unlock_irqrestore(&bcs->cs->lock, flags);
      return 1;
}

void gigaset_free_channel(struct bc_state *bcs)
{
      unsigned long flags;

      spin_lock_irqsave(&bcs->cs->lock, flags);
      if (!bcs->busy) {
            gig_dbg(DEBUG_ANY, "could not free channel %d", bcs->channel);
            spin_unlock_irqrestore(&bcs->cs->lock, flags);
            return;
      }
      --bcs->use_count;
      bcs->busy = 0;
      gig_dbg(DEBUG_ANY, "freed channel %d", bcs->channel);
      spin_unlock_irqrestore(&bcs->cs->lock, flags);
}

int gigaset_get_channels(struct cardstate *cs)
{
      unsigned long flags;
      int i;

      spin_lock_irqsave(&cs->lock, flags);
      for (i = 0; i < cs->channels; ++i)
            if (cs->bcs[i].use_count) {
                  spin_unlock_irqrestore(&cs->lock, flags);
                  gig_dbg(DEBUG_ANY, "could not allocate all channels");
                  return 0;
            }
      for (i = 0; i < cs->channels; ++i)
            ++cs->bcs[i].use_count;
      spin_unlock_irqrestore(&cs->lock, flags);

      gig_dbg(DEBUG_ANY, "allocated all channels");

      return 1;
}

void gigaset_free_channels(struct cardstate *cs)
{
      unsigned long flags;
      int i;

      gig_dbg(DEBUG_ANY, "unblocking all channels");
      spin_lock_irqsave(&cs->lock, flags);
      for (i = 0; i < cs->channels; ++i)
            --cs->bcs[i].use_count;
      spin_unlock_irqrestore(&cs->lock, flags);
}

void gigaset_block_channels(struct cardstate *cs)
{
      unsigned long flags;
      int i;

      gig_dbg(DEBUG_ANY, "blocking all channels");
      spin_lock_irqsave(&cs->lock, flags);
      for (i = 0; i < cs->channels; ++i)
            ++cs->bcs[i].use_count;
      spin_unlock_irqrestore(&cs->lock, flags);
}

static void clear_events(struct cardstate *cs)
{
      struct event_t *ev;
      unsigned head, tail;
      unsigned long flags;

      spin_lock_irqsave(&cs->ev_lock, flags);

      head = cs->ev_head;
      tail = cs->ev_tail;

      while (tail != head) {
            ev = cs->events + head;
            kfree(ev->ptr);
            head = (head + 1) % MAX_EVENTS;
      }

      cs->ev_head = tail;

      spin_unlock_irqrestore(&cs->ev_lock, flags);
}

struct event_t *gigaset_add_event(struct cardstate *cs,
                          struct at_state_t *at_state, int type,
                          void *ptr, int parameter, void *arg)
{
      unsigned long flags;
      unsigned next, tail;
      struct event_t *event = NULL;

      spin_lock_irqsave(&cs->ev_lock, flags);

      tail = cs->ev_tail;
      next = (tail + 1) % MAX_EVENTS;
      if (unlikely(next == cs->ev_head))
            err("event queue full");
      else {
            event = cs->events + tail;
            event->type = type;
            event->at_state = at_state;
            event->cid = -1;
            event->ptr = ptr;
            event->arg = arg;
            event->parameter = parameter;
            cs->ev_tail = next;
      }

      spin_unlock_irqrestore(&cs->ev_lock, flags);

      return event;
}
EXPORT_SYMBOL_GPL(gigaset_add_event);

static void free_strings(struct at_state_t *at_state)
{
      int i;

      for (i = 0; i < STR_NUM; ++i) {
            kfree(at_state->str_var[i]);
            at_state->str_var[i] = NULL;
      }
}

static void clear_at_state(struct at_state_t *at_state)
{
      free_strings(at_state);
}

static void dealloc_at_states(struct cardstate *cs)
{
      struct at_state_t *cur, *next;

      list_for_each_entry_safe(cur, next, &cs->temp_at_states, list) {
            list_del(&cur->list);
            free_strings(cur);
            kfree(cur);
      }
}

static void gigaset_freebcs(struct bc_state *bcs)
{
      int i;

      gig_dbg(DEBUG_INIT, "freeing bcs[%d]->hw", bcs->channel);
      if (!bcs->cs->ops->freebcshw(bcs)) {
            gig_dbg(DEBUG_INIT, "failed");
      }

      gig_dbg(DEBUG_INIT, "clearing bcs[%d]->at_state", bcs->channel);
      clear_at_state(&bcs->at_state);
      gig_dbg(DEBUG_INIT, "freeing bcs[%d]->skb", bcs->channel);

      if (bcs->skb)
            dev_kfree_skb(bcs->skb);
      for (i = 0; i < AT_NUM; ++i) {
            kfree(bcs->commands[i]);
            bcs->commands[i] = NULL;
      }
}

static struct cardstate *alloc_cs(struct gigaset_driver *drv)
{
      unsigned long flags;
      unsigned i;
      struct cardstate *ret = NULL;

      spin_lock_irqsave(&drv->lock, flags);
      for (i = 0; i < drv->minors; ++i) {
            if (!(drv->flags[i] & VALID_MINOR)) {
                  if (try_module_get(drv->owner)) {
                        drv->flags[i] = VALID_MINOR;
                        ret = drv->cs + i;
                  }
                  break;
            }
      }
      spin_unlock_irqrestore(&drv->lock, flags);
      return ret;
}

static void free_cs(struct cardstate *cs)
{
      unsigned long flags;
      struct gigaset_driver *drv = cs->driver;
      spin_lock_irqsave(&drv->lock, flags);
      if (drv->flags[cs->minor_index] & VALID_MINOR)
            module_put(drv->owner);
      drv->flags[cs->minor_index] = 0;
      spin_unlock_irqrestore(&drv->lock, flags);
}

static void make_valid(struct cardstate *cs, unsigned mask)
{
      unsigned long flags;
      struct gigaset_driver *drv = cs->driver;
      spin_lock_irqsave(&drv->lock, flags);
      drv->flags[cs->minor_index] |= mask;
      spin_unlock_irqrestore(&drv->lock, flags);
}

static void make_invalid(struct cardstate *cs, unsigned mask)
{
      unsigned long flags;
      struct gigaset_driver *drv = cs->driver;
      spin_lock_irqsave(&drv->lock, flags);
      drv->flags[cs->minor_index] &= ~mask;
      spin_unlock_irqrestore(&drv->lock, flags);
}

void gigaset_freecs(struct cardstate *cs)
{
      int i;
      unsigned long flags;

      if (!cs)
            return;

      mutex_lock(&cs->mutex);

      if (!cs->bcs)
            goto f_cs;
      if (!cs->inbuf)
            goto f_bcs;

      spin_lock_irqsave(&cs->lock, flags);
      cs->running = 0;
      spin_unlock_irqrestore(&cs->lock, flags); /* event handler and timer are
                                         not rescheduled below */

      tasklet_kill(&cs->event_tasklet);
      del_timer_sync(&cs->timer);

      switch (cs->cs_init) {
      default:
            /* clear device sysfs */
            gigaset_free_dev_sysfs(cs);

            gigaset_if_free(cs);

            gig_dbg(DEBUG_INIT, "clearing hw");
            cs->ops->freecshw(cs);

            //FIXME cmdbuf

            /* fall through */
      case 2: /* error in initcshw */
            /* Deregister from LL */
            make_invalid(cs, VALID_ID);
            gig_dbg(DEBUG_INIT, "clearing iif");
            gigaset_i4l_cmd(cs, ISDN_STAT_UNLOAD);

            /* fall through */
      case 1: /* error when regestering to LL */
            gig_dbg(DEBUG_INIT, "clearing at_state");
            clear_at_state(&cs->at_state);
            dealloc_at_states(cs);

            /* fall through */
      case 0: /* error in one call to initbcs */
            for (i = 0; i < cs->channels; ++i) {
                  gig_dbg(DEBUG_INIT, "clearing bcs[%d]", i);
                  gigaset_freebcs(cs->bcs + i);
            }

            clear_events(cs);
            gig_dbg(DEBUG_INIT, "freeing inbuf");
            kfree(cs->inbuf);
      }
f_bcs:      gig_dbg(DEBUG_INIT, "freeing bcs[]");
      kfree(cs->bcs);
f_cs: gig_dbg(DEBUG_INIT, "freeing cs");
      mutex_unlock(&cs->mutex);
      free_cs(cs);
}
EXPORT_SYMBOL_GPL(gigaset_freecs);

void gigaset_at_init(struct at_state_t *at_state, struct bc_state *bcs,
                 struct cardstate *cs, int cid)
{
      int i;

      INIT_LIST_HEAD(&at_state->list);
      at_state->waiting = 0;
      at_state->getstring = 0;
      at_state->pending_commands = 0;
      at_state->timer_expires = 0;
      at_state->timer_active = 0;
      at_state->timer_index = 0;
      at_state->seq_index = 0;
      at_state->ConState = 0;
      for (i = 0; i < STR_NUM; ++i)
            at_state->str_var[i] = NULL;
      at_state->int_var[VAR_ZDLE] = 0;
      at_state->int_var[VAR_ZCTP] = -1;
      at_state->int_var[VAR_ZSAU] = ZSAU_NULL;
      at_state->cs = cs;
      at_state->bcs = bcs;
      at_state->cid = cid;
      if (!cid)
            at_state->replystruct = cs->tabnocid;
      else
            at_state->replystruct = cs->tabcid;
}


static void gigaset_inbuf_init(struct inbuf_t *inbuf, struct bc_state *bcs,
                         struct cardstate *cs, int inputstate)
/* inbuf->read must be allocated before! */
{
      atomic_set(&inbuf->head, 0);
      atomic_set(&inbuf->tail, 0);
      inbuf->cs = cs;
      inbuf->bcs = bcs; /*base driver: NULL*/
      inbuf->rcvbuf = NULL; //FIXME
      inbuf->inputstate = inputstate;
}

/* append received bytes to inbuf */
int gigaset_fill_inbuf(struct inbuf_t *inbuf, const unsigned char *src,
                   unsigned numbytes)
{
      unsigned n, head, tail, bytesleft;

      gig_dbg(DEBUG_INTR, "received %u bytes", numbytes);

      if (!numbytes)
            return 0;

      bytesleft = numbytes;
      tail = atomic_read(&inbuf->tail);
      head = atomic_read(&inbuf->head);
      gig_dbg(DEBUG_INTR, "buffer state: %u -> %u", head, tail);

      while (bytesleft) {
            if (head > tail)
                  n = head - 1 - tail;
            else if (head == 0)
                  n = (RBUFSIZE-1) - tail;
            else
                  n = RBUFSIZE - tail;
            if (!n) {
                  dev_err(inbuf->cs->dev,
                        "buffer overflow (%u bytes lost)\n",
                        bytesleft);
                  break;
            }
            if (n > bytesleft)
                  n = bytesleft;
            memcpy(inbuf->data + tail, src, n);
            bytesleft -= n;
            tail = (tail + n) % RBUFSIZE;
            src += n;
      }
      gig_dbg(DEBUG_INTR, "setting tail to %u", tail);
      atomic_set(&inbuf->tail, tail);
      return numbytes != bytesleft;
}
EXPORT_SYMBOL_GPL(gigaset_fill_inbuf);

/* Initialize the b-channel structure */
static struct bc_state *gigaset_initbcs(struct bc_state *bcs,
                              struct cardstate *cs, int channel)
{
      int i;

      bcs->tx_skb = NULL; //FIXME -> hw part

      skb_queue_head_init(&bcs->squeue);

      bcs->corrupted = 0;
      bcs->trans_down = 0;
      bcs->trans_up = 0;

      gig_dbg(DEBUG_INIT, "setting up bcs[%d]->at_state", channel);
      gigaset_at_init(&bcs->at_state, bcs, cs, -1);

      bcs->rcvbytes = 0;

#ifdef CONFIG_GIGASET_DEBUG
      bcs->emptycount = 0;
#endif

      gig_dbg(DEBUG_INIT, "allocating bcs[%d]->skb", channel);
      bcs->fcs = PPP_INITFCS;
      bcs->inputstate = 0;
      if (cs->ignoreframes) {
            bcs->inputstate |= INS_skip_frame;
            bcs->skb = NULL;
      } else if ((bcs->skb = dev_alloc_skb(SBUFSIZE + HW_HDR_LEN)) != NULL)
            skb_reserve(bcs->skb, HW_HDR_LEN);
      else {
            warn("could not allocate skb");
            bcs->inputstate |= INS_skip_frame;
      }

      bcs->channel = channel;
      bcs->cs = cs;

      bcs->chstate = 0;
      bcs->use_count = 1;
      bcs->busy = 0;
      bcs->ignore = cs->ignoreframes;

      for (i = 0; i < AT_NUM; ++i)
            bcs->commands[i] = NULL;

      gig_dbg(DEBUG_INIT, "  setting up bcs[%d]->hw", channel);
      if (cs->ops->initbcshw(bcs))
            return bcs;

      gig_dbg(DEBUG_INIT, "  failed");

      gig_dbg(DEBUG_INIT, "  freeing bcs[%d]->skb", channel);
      if (bcs->skb)
            dev_kfree_skb(bcs->skb);

      return NULL;
}

/* gigaset_initcs
 * Allocate and initialize cardstate structure for Gigaset driver
 * Calls hardware dependent gigaset_initcshw() function
 * Calls B channel initialization function gigaset_initbcs() for each B channel
 * parameters:
 *    drv         hardware driver the device belongs to
 *    channels    number of B channels supported by device
 *    onechannel  !=0: B channel data and AT commands share one
 *                     communication channel
 *                ==0: B channels have separate communication channels
 *    ignoreframes      number of frames to ignore after setting up B channel
 *    cidmode           !=0: start in CallID mode
 *    modulename  name of driver module (used for I4L registration)
 * return value:
 *    pointer to cardstate structure
 */
struct cardstate *gigaset_initcs(struct gigaset_driver *drv, int channels,
                         int onechannel, int ignoreframes,
                         int cidmode, const char *modulename)
{
      struct cardstate *cs = NULL;
      unsigned long flags;
      int i;

      gig_dbg(DEBUG_INIT, "allocating cs");
      if (!(cs = alloc_cs(drv))) {
            err("maximum number of devices exceeded");
            return NULL;
      }
      mutex_init(&cs->mutex);

      gig_dbg(DEBUG_INIT, "allocating bcs[0..%d]", channels - 1);
      cs->bcs = kmalloc(channels * sizeof(struct bc_state), GFP_KERNEL);
      if (!cs->bcs) {
            err("out of memory");
            goto error;
      }
      gig_dbg(DEBUG_INIT, "allocating inbuf");
      cs->inbuf = kmalloc(sizeof(struct inbuf_t), GFP_KERNEL);
      if (!cs->inbuf) {
            err("out of memory");
            goto error;
      }

      cs->cs_init = 0;
      cs->channels = channels;
      cs->onechannel = onechannel;
      cs->ignoreframes = ignoreframes;
      INIT_LIST_HEAD(&cs->temp_at_states);
      cs->running = 0;
      init_timer(&cs->timer); /* clear next & prev */
      spin_lock_init(&cs->ev_lock);
      cs->ev_tail = 0;
      cs->ev_head = 0;

      tasklet_init(&cs->event_tasklet, &gigaset_handle_event,
                 (unsigned long) cs);
      atomic_set(&cs->commands_pending, 0);
      cs->cur_at_seq = 0;
      cs->gotfwver = -1;
      cs->open_count = 0;
      cs->dev = NULL;
      cs->tty = NULL;
      cs->tty_dev = NULL;
      cs->cidmode = cidmode != 0;

      //if(onechannel) { //FIXME
            cs->tabnocid = gigaset_tab_nocid_m10x;
            cs->tabcid = gigaset_tab_cid_m10x;
      //} else {
      //    cs->tabnocid = gigaset_tab_nocid;
      //    cs->tabcid = gigaset_tab_cid;
      //}

      init_waitqueue_head(&cs->waitqueue);
      cs->waiting = 0;

      atomic_set(&cs->mode, M_UNKNOWN);
      atomic_set(&cs->mstate, MS_UNINITIALIZED);

      for (i = 0; i < channels; ++i) {
            gig_dbg(DEBUG_INIT, "setting up bcs[%d].read", i);
            if (!gigaset_initbcs(cs->bcs + i, cs, i)) {
                  err("could not allocate channel %d data", i);
                  goto error;
            }
      }

      ++cs->cs_init;

      gig_dbg(DEBUG_INIT, "setting up at_state");
      spin_lock_init(&cs->lock);
      gigaset_at_init(&cs->at_state, NULL, cs, 0);
      cs->dle = 0;
      cs->cbytes = 0;

      gig_dbg(DEBUG_INIT, "setting up inbuf");
      if (onechannel) {             //FIXME distinction necessary?
            gigaset_inbuf_init(cs->inbuf, cs->bcs, cs, INS_command);
      } else
            gigaset_inbuf_init(cs->inbuf, NULL,    cs, INS_command);

      cs->connected = 0;
      cs->isdn_up = 0;

      gig_dbg(DEBUG_INIT, "setting up cmdbuf");
      cs->cmdbuf = cs->lastcmdbuf = NULL;
      spin_lock_init(&cs->cmdlock);
      cs->curlen = 0;
      cs->cmdbytes = 0;

      gig_dbg(DEBUG_INIT, "setting up iif");
      if (!gigaset_register_to_LL(cs, modulename)) {
            err("register_isdn failed");
            goto error;
      }

      make_valid(cs, VALID_ID);
      ++cs->cs_init;
      gig_dbg(DEBUG_INIT, "setting up hw");
      if (!cs->ops->initcshw(cs)) {
            err("could not allocate device specific data");
            goto error;
      }

      ++cs->cs_init;

      /* set up character device */
      gigaset_if_init(cs);

      /* set up device sysfs */
      gigaset_init_dev_sysfs(cs);

      spin_lock_irqsave(&cs->lock, flags);
      cs->running = 1;
      spin_unlock_irqrestore(&cs->lock, flags);
      setup_timer(&cs->timer, timer_tick, (unsigned long) cs);
      cs->timer.expires = jiffies + msecs_to_jiffies(GIG_TICK);
      /* FIXME: can jiffies increase too much until the timer is added?
       * Same problem(?) with mod_timer() in timer_tick(). */
      add_timer(&cs->timer);

      gig_dbg(DEBUG_INIT, "cs initialized");
      return cs;

error:
      gig_dbg(DEBUG_INIT, "failed");
      gigaset_freecs(cs);
      return NULL;
}
EXPORT_SYMBOL_GPL(gigaset_initcs);

/* ReInitialize the b-channel structure on hangup */
void gigaset_bcs_reinit(struct bc_state *bcs)
{
      struct sk_buff *skb;
      struct cardstate *cs = bcs->cs;
      unsigned long flags;

      while ((skb = skb_dequeue(&bcs->squeue)) != NULL)
            dev_kfree_skb(skb);

      spin_lock_irqsave(&cs->lock, flags);
      clear_at_state(&bcs->at_state);
      bcs->at_state.ConState = 0;
      bcs->at_state.timer_active = 0;
      bcs->at_state.timer_expires = 0;
      bcs->at_state.cid = -1;             /* No CID defined */
      spin_unlock_irqrestore(&cs->lock, flags);

      bcs->inputstate = 0;

#ifdef CONFIG_GIGASET_DEBUG
      bcs->emptycount = 0;
#endif

      bcs->fcs = PPP_INITFCS;
      bcs->chstate = 0;

      bcs->ignore = cs->ignoreframes;
      if (bcs->ignore)
            bcs->inputstate |= INS_skip_frame;


      cs->ops->reinitbcshw(bcs);
}

static void cleanup_cs(struct cardstate *cs)
{
      struct cmdbuf_t *cb, *tcb;
      int i;
      unsigned long flags;

      spin_lock_irqsave(&cs->lock, flags);

      atomic_set(&cs->mode, M_UNKNOWN);
      atomic_set(&cs->mstate, MS_UNINITIALIZED);

      clear_at_state(&cs->at_state);
      dealloc_at_states(cs);
      free_strings(&cs->at_state);
      gigaset_at_init(&cs->at_state, NULL, cs, 0);

      kfree(cs->inbuf->rcvbuf);
      cs->inbuf->rcvbuf = NULL;
      cs->inbuf->inputstate = INS_command;
      atomic_set(&cs->inbuf->head, 0);
      atomic_set(&cs->inbuf->tail, 0);

      cb = cs->cmdbuf;
      while (cb) {
            tcb = cb;
            cb = cb->next;
            kfree(tcb);
      }
      cs->cmdbuf = cs->lastcmdbuf = NULL;
      cs->curlen = 0;
      cs->cmdbytes = 0;
      cs->gotfwver = -1;
      cs->dle = 0;
      cs->cur_at_seq = 0;
      atomic_set(&cs->commands_pending, 0);
      cs->cbytes = 0;

      spin_unlock_irqrestore(&cs->lock, flags);

      for (i = 0; i < cs->channels; ++i) {
            gigaset_freebcs(cs->bcs + i);
            if (!gigaset_initbcs(cs->bcs + i, cs, i))
                  break;                  //FIXME error handling
      }

      if (cs->waiting) {
            cs->cmd_result = -ENODEV;
            cs->waiting = 0;
            wake_up_interruptible(&cs->waitqueue);
      }
}


int gigaset_start(struct cardstate *cs)
{
      unsigned long flags;

      if (mutex_lock_interruptible(&cs->mutex))
            return 0;

      spin_lock_irqsave(&cs->lock, flags);
      cs->connected = 1;
      spin_unlock_irqrestore(&cs->lock, flags);

      if (atomic_read(&cs->mstate) != MS_LOCKED) {
            cs->ops->set_modem_ctrl(cs, 0, TIOCM_DTR|TIOCM_RTS);
            cs->ops->baud_rate(cs, B115200);
            cs->ops->set_line_ctrl(cs, CS8);
            cs->control_state = TIOCM_DTR|TIOCM_RTS;
      } else {
            //FIXME use some saved values?
      }

      cs->waiting = 1;

      if (!gigaset_add_event(cs, &cs->at_state, EV_START, NULL, 0, NULL)) {
            cs->waiting = 0;
            //FIXME what should we do?
            goto error;
      }

      gig_dbg(DEBUG_CMD, "scheduling START");
      gigaset_schedule_event(cs);

      wait_event(cs->waitqueue, !cs->waiting);

      mutex_unlock(&cs->mutex);
      return 1;

error:
      mutex_unlock(&cs->mutex);
      return 0;
}
EXPORT_SYMBOL_GPL(gigaset_start);

void gigaset_shutdown(struct cardstate *cs)
{
      mutex_lock(&cs->mutex);

      cs->waiting = 1;

      if (!gigaset_add_event(cs, &cs->at_state, EV_SHUTDOWN, NULL, 0, NULL)) {
            //FIXME what should we do?
            goto exit;
      }

      gig_dbg(DEBUG_CMD, "scheduling SHUTDOWN");
      gigaset_schedule_event(cs);

      wait_event(cs->waitqueue, !cs->waiting);

      cleanup_cs(cs);

exit:
      mutex_unlock(&cs->mutex);
}
EXPORT_SYMBOL_GPL(gigaset_shutdown);

void gigaset_stop(struct cardstate *cs)
{
      mutex_lock(&cs->mutex);

      cs->waiting = 1;

      if (!gigaset_add_event(cs, &cs->at_state, EV_STOP, NULL, 0, NULL)) {
            //FIXME what should we do?
            goto exit;
      }

      gig_dbg(DEBUG_CMD, "scheduling STOP");
      gigaset_schedule_event(cs);

      wait_event(cs->waitqueue, !cs->waiting);

      cleanup_cs(cs);

exit:
      mutex_unlock(&cs->mutex);
}
EXPORT_SYMBOL_GPL(gigaset_stop);

static LIST_HEAD(drivers);
static DEFINE_SPINLOCK(driver_lock);

struct cardstate *gigaset_get_cs_by_id(int id)
{
      unsigned long flags;
      struct cardstate *ret = NULL;
      struct cardstate *cs;
      struct gigaset_driver *drv;
      unsigned i;

      spin_lock_irqsave(&driver_lock, flags);
      list_for_each_entry(drv, &drivers, list) {
            spin_lock(&drv->lock);
            for (i = 0; i < drv->minors; ++i) {
                  if (drv->flags[i] & VALID_ID) {
                        cs = drv->cs + i;
                        if (cs->myid == id)
                              ret = cs;
                  }
                  if (ret)
                        break;
            }
            spin_unlock(&drv->lock);
            if (ret)
                  break;
      }
      spin_unlock_irqrestore(&driver_lock, flags);
      return ret;
}

void gigaset_debugdrivers(void)
{
      unsigned long flags;
      static struct cardstate *cs;
      struct gigaset_driver *drv;
      unsigned i;

      spin_lock_irqsave(&driver_lock, flags);
      list_for_each_entry(drv, &drivers, list) {
            gig_dbg(DEBUG_DRIVER, "driver %p", drv);
            spin_lock(&drv->lock);
            for (i = 0; i < drv->minors; ++i) {
                  gig_dbg(DEBUG_DRIVER, "  index %u", i);
                  gig_dbg(DEBUG_DRIVER, "    flags 0x%02x",
                        drv->flags[i]);
                  cs = drv->cs + i;
                  gig_dbg(DEBUG_DRIVER, "    cardstate %p", cs);
                  gig_dbg(DEBUG_DRIVER, "    minor_index %u",
                        cs->minor_index);
                  gig_dbg(DEBUG_DRIVER, "    driver %p", cs->driver);
                  gig_dbg(DEBUG_DRIVER, "    i4l id %d", cs->myid);
            }
            spin_unlock(&drv->lock);
      }
      spin_unlock_irqrestore(&driver_lock, flags);
}

static struct cardstate *gigaset_get_cs_by_minor(unsigned minor)
{
      unsigned long flags;
      struct cardstate *ret = NULL;
      struct gigaset_driver *drv;
      unsigned index;

      spin_lock_irqsave(&driver_lock, flags);
      list_for_each_entry(drv, &drivers, list) {
            if (minor < drv->minor || minor >= drv->minor + drv->minors)
                  continue;
            index = minor - drv->minor;
            spin_lock(&drv->lock);
            if (drv->flags[index] & VALID_MINOR)
                  ret = drv->cs + index;
            spin_unlock(&drv->lock);
            if (ret)
                  break;
      }
      spin_unlock_irqrestore(&driver_lock, flags);
      return ret;
}

struct cardstate *gigaset_get_cs_by_tty(struct tty_struct *tty)
{
      if (tty->index < 0 || tty->index >= tty->driver->num)
            return NULL;
      return gigaset_get_cs_by_minor(tty->index + tty->driver->minor_start);
}

void gigaset_freedriver(struct gigaset_driver *drv)
{
      unsigned long flags;

      spin_lock_irqsave(&driver_lock, flags);
      list_del(&drv->list);
      spin_unlock_irqrestore(&driver_lock, flags);

      gigaset_if_freedriver(drv);

      kfree(drv->cs);
      kfree(drv->flags);
      kfree(drv);
}
EXPORT_SYMBOL_GPL(gigaset_freedriver);

/* gigaset_initdriver
 * Allocate and initialize gigaset_driver structure. Initialize interface.
 * parameters:
 *    minor       First minor number
 *    minors            Number of minors this driver can handle
 *    procname    Name of the driver
 *    devname           Name of the device files (prefix without minor number)
 * return value:
 *    Pointer to the gigaset_driver structure on success, NULL on failure.
 */
struct gigaset_driver *gigaset_initdriver(unsigned minor, unsigned minors,
                                const char *procname,
                                const char *devname,
                                const struct gigaset_ops *ops,
                                struct module *owner)
{
      struct gigaset_driver *drv;
      unsigned long flags;
      unsigned i;

      drv = kmalloc(sizeof *drv, GFP_KERNEL);
      if (!drv)
            return NULL;

      drv->have_tty = 0;
      drv->minor = minor;
      drv->minors = minors;
      spin_lock_init(&drv->lock);
      drv->blocked = 0;
      drv->ops = ops;
      drv->owner = owner;
      INIT_LIST_HEAD(&drv->list);

      drv->cs = kmalloc(minors * sizeof *drv->cs, GFP_KERNEL);
      if (!drv->cs)
            goto error;

      drv->flags = kmalloc(minors * sizeof *drv->flags, GFP_KERNEL);
      if (!drv->flags)
            goto error;

      for (i = 0; i < minors; ++i) {
            drv->flags[i] = 0;
            drv->cs[i].driver = drv;
            drv->cs[i].ops = drv->ops;
            drv->cs[i].minor_index = i;
      }

      gigaset_if_initdriver(drv, procname, devname);

      spin_lock_irqsave(&driver_lock, flags);
      list_add(&drv->list, &drivers);
      spin_unlock_irqrestore(&driver_lock, flags);

      return drv;

error:
      kfree(drv->cs);
      kfree(drv);
      return NULL;
}
EXPORT_SYMBOL_GPL(gigaset_initdriver);

/* For drivers without fixed assignment device<->cardstate (usb) */
struct cardstate *gigaset_getunassignedcs(struct gigaset_driver *drv)
{
      unsigned long flags;
      struct cardstate *cs = NULL;
      unsigned i;

      spin_lock_irqsave(&drv->lock, flags);
      if (drv->blocked)
            goto exit;
      for (i = 0; i < drv->minors; ++i) {
            if ((drv->flags[i] & VALID_MINOR) &&
                !(drv->flags[i] & ASSIGNED)) {
                  drv->flags[i] |= ASSIGNED;
                  cs = drv->cs + i;
                  break;
            }
      }
exit:
      spin_unlock_irqrestore(&drv->lock, flags);
      return cs;
}
EXPORT_SYMBOL_GPL(gigaset_getunassignedcs);

void gigaset_unassign(struct cardstate *cs)
{
      unsigned long flags;
      unsigned *minor_flags;
      struct gigaset_driver *drv;

      if (!cs)
            return;
      drv = cs->driver;
      spin_lock_irqsave(&drv->lock, flags);
      minor_flags = drv->flags + cs->minor_index;
      if (*minor_flags & VALID_MINOR)
            *minor_flags &= ~ASSIGNED;
      spin_unlock_irqrestore(&drv->lock, flags);
}
EXPORT_SYMBOL_GPL(gigaset_unassign);

void gigaset_blockdriver(struct gigaset_driver *drv)
{
      unsigned long flags;
      spin_lock_irqsave(&drv->lock, flags);
      drv->blocked = 1;
      spin_unlock_irqrestore(&drv->lock, flags);
}
EXPORT_SYMBOL_GPL(gigaset_blockdriver);

static int __init gigaset_init_module(void)
{
      /* in accordance with the principle of least astonishment,
       * setting the 'debug' parameter to 1 activates a sensible
       * set of default debug levels
       */
      if (gigaset_debuglevel == 1)
            gigaset_debuglevel = DEBUG_DEFAULT;

      info(DRIVER_AUTHOR);
      info(DRIVER_DESC);
      return 0;
}

static void __exit gigaset_exit_module(void)
{
}

module_init(gigaset_init_module);
module_exit(gigaset_exit_module);

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESC);

MODULE_LICENSE("GPL");

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