--- /dev/null
+/*
+ * 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/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"
+
+#ifdef CONFIG_GIGASET_DEBUG
+#define DRIVER_DESC_DEBUG " (debug build)"
+#else
+#define DRIVER_DESC_DEBUG ""
+#endif
+
+/* Module parameters */
+int gigaset_debuglevel;
+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
+
+/**
+ * gigaset_dbg_buffer() - dump data in ASCII and hex for debugging
+ * @level: debugging level.
+ * @msg: message prefix.
+ * @len: number of bytes to dump.
+ * @buf: data to dump.
+ *
+ * If the current debugging level includes one of the bits set in @level,
+ * @len bytes starting at @buf are logged to dmesg at KERN_DEBUG prio,
+ * prefixed by the text @msg.
+ */
+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;
+
+ 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;
+ cs->ops->set_modem_ctrl(cs, 0, TIOCM_RTS | TIOCM_DTR);
+
+ return -1;
+}
+
+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;
+ }
+
+ gigaset_add_event(at_state->cs, at_state, EV_TIMEOUT, NULL,
+ at_state->timer_index, NULL);
+ 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_EVENT, "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 || !try_module_get(bcs->cs->driver->owner)) {
+ gig_dbg(DEBUG_CHANNEL, "could not allocate channel %d",
+ bcs->channel);
+ spin_unlock_irqrestore(&bcs->cs->lock, flags);
+ return -EBUSY;
+ }
+ ++bcs->use_count;
+ bcs->busy = 1;
+ gig_dbg(DEBUG_CHANNEL, "allocated channel %d", bcs->channel);
+ spin_unlock_irqrestore(&bcs->cs->lock, flags);
+ return 0;
+}
+
+struct bc_state *gigaset_get_free_channel(struct cardstate *cs)
+{
+ unsigned long flags;
+ int i;
+
+ spin_lock_irqsave(&cs->lock, flags);
+ if (!try_module_get(cs->driver->owner)) {
+ gig_dbg(DEBUG_CHANNEL,
+ "could not get module for allocating channel");
+ spin_unlock_irqrestore(&cs->lock, flags);
+ return NULL;
+ }
+ for (i = 0; i < cs->channels; ++i)
+ if (!cs->bcs[i].use_count) {
+ ++cs->bcs[i].use_count;
+ cs->bcs[i].busy = 1;
+ spin_unlock_irqrestore(&cs->lock, flags);
+ gig_dbg(DEBUG_CHANNEL, "allocated channel %d", i);
+ return cs->bcs + i;
+ }
+ module_put(cs->driver->owner);
+ spin_unlock_irqrestore(&cs->lock, flags);
+ gig_dbg(DEBUG_CHANNEL, "no free channel");
+ return NULL;
+}
+
+void gigaset_free_channel(struct bc_state *bcs)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&bcs->cs->lock, flags);
+ if (!bcs->busy) {
+ gig_dbg(DEBUG_CHANNEL, "could not free channel %d",
+ bcs->channel);
+ spin_unlock_irqrestore(&bcs->cs->lock, flags);
+ return;
+ }
+ --bcs->use_count;
+ bcs->busy = 0;
+ module_put(bcs->cs->driver->owner);
+ gig_dbg(DEBUG_CHANNEL, "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_CHANNEL,
+ "could not allocate all channels");
+ return -EBUSY;
+ }
+ for (i = 0; i < cs->channels; ++i)
+ ++cs->bcs[i].use_count;
+ spin_unlock_irqrestore(&cs->lock, flags);
+
+ gig_dbg(DEBUG_CHANNEL, "allocated all channels");
+
+ return 0;
+}
+
+void gigaset_free_channels(struct cardstate *cs)
+{
+ unsigned long flags;
+ int i;
+
+ gig_dbg(DEBUG_CHANNEL, "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_CHANNEL, "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);
+}
+
+/**
+ * gigaset_add_event() - add event to device event queue
+ * @cs: device descriptor structure.
+ * @at_state: connection state structure.
+ * @type: event type.
+ * @ptr: pointer parameter for event.
+ * @parameter: integer parameter for event.
+ * @arg: pointer parameter for event.
+ *
+ * Allocate an event queue entry from the device's event queue, and set it up
+ * with the parameters given.
+ *
+ * Return value: added event
+ */
+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;
+
+ gig_dbg(DEBUG_EVENT, "queueing event %d", type);
+
+ spin_lock_irqsave(&cs->ev_lock, flags);
+
+ tail = cs->ev_tail;
+ next = (tail + 1) % MAX_EVENTS;
+ if (unlikely(next == cs->ev_head))
+ dev_err(cs->dev, "event queue full\n");
+ 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 clear_at_state(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 dealloc_temp_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);
+ clear_at_state(cur);
+ kfree(cur);
+ }
+}
+
+static void gigaset_freebcs(struct bc_state *bcs)
+{
+ int i;
+
+ gig_dbg(DEBUG_INIT, "freeing bcs[%d]->hw", bcs->channel);
+ bcs->cs->ops->freebcshw(bcs);
+
+ 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);
+ dev_kfree_skb(bcs->rx_skb);
+ bcs->rx_skb = NULL;
+
+ 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 *cs;
+ struct cardstate *ret = NULL;
+
+ spin_lock_irqsave(&drv->lock, flags);
+ if (drv->blocked)
+ goto exit;
+ for (i = 0; i < drv->minors; ++i) {
+ cs = drv->cs + i;
+ if (!(cs->flags & VALID_MINOR)) {
+ cs->flags = VALID_MINOR;
+ ret = cs;
+ break;
+ }
+ }
+exit:
+ spin_unlock_irqrestore(&drv->lock, flags);
+ return ret;
+}
+
+static void free_cs(struct cardstate *cs)
+{
+ cs->flags = 0;
+}
+
+static void make_valid(struct cardstate *cs, unsigned mask)
+{
+ unsigned long flags;
+ struct gigaset_driver *drv = cs->driver;
+ spin_lock_irqsave(&drv->lock, flags);
+ cs->flags |= 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);
+ cs->flags &= ~mask;
+ spin_unlock_irqrestore(&drv->lock, flags);
+}
+
+/**
+ * gigaset_freecs() - free all associated ressources of a device
+ * @cs: device descriptor structure.
+ *
+ * Stops all tasklets and timers, unregisters the device from all
+ * subsystems it was registered to, deallocates the device structure
+ * @cs and all structures referenced from it.
+ * Operations on the device should be stopped before calling this.
+ */
+void gigaset_freecs(struct cardstate *cs)
+{
+ int i;
+ unsigned long flags;
+
+ if (!cs)
+ return;
+
+ mutex_lock(&cs->mutex);
+
+ 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 B channel structures */
+ for (i = 0; i < cs->channels; ++i) {
+ gig_dbg(DEBUG_INIT, "clearing bcs[%d]", i);
+ gigaset_freebcs(cs->bcs + i);
+ }
+
+ /* clear device sysfs */
+ gigaset_free_dev_sysfs(cs);
+
+ gigaset_if_free(cs);
+
+ gig_dbg(DEBUG_INIT, "clearing hw");
+ cs->ops->freecshw(cs);
+
+ /* fall through */
+ case 2: /* error in initcshw */
+ /* Deregister from LL */
+ make_invalid(cs, VALID_ID);
+ gigaset_isdn_unregdev(cs);
+
+ /* fall through */
+ case 1: /* error when registering to LL */
+ gig_dbg(DEBUG_INIT, "clearing at_state");
+ clear_at_state(&cs->at_state);
+ dealloc_temp_at_states(cs);
+ clear_events(cs);
+ tty_port_destroy(&cs->port);
+
+ /* fall through */
+ case 0: /* error in basic setup */
+ gig_dbg(DEBUG_INIT, "freeing inbuf");
+ kfree(cs->inbuf);
+ kfree(cs->bcs);
+ }
+
+ 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 cardstate *cs)
+/* inbuf->read must be allocated before! */
+{
+ inbuf->head = 0;
+ inbuf->tail = 0;
+ inbuf->cs = cs;
+ inbuf->inputstate = INS_command;
+}
+
+/**
+ * gigaset_fill_inbuf() - append received data to input buffer
+ * @inbuf: buffer structure.
+ * @src: received data.
+ * @numbytes: number of bytes received.
+ *
+ * Return value: !=0 if some data was appended
+ */
+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 = inbuf->tail;
+ head = 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);
+ inbuf->tail = tail;
+ return numbytes != bytesleft;
+}
+EXPORT_SYMBOL_GPL(gigaset_fill_inbuf);
+
+/* Initialize the b-channel structure */
+static int gigaset_initbcs(struct bc_state *bcs, struct cardstate *cs,
+ int channel)
+{
+ int i;
+
+ bcs->tx_skb = NULL;
+
+ 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);
+
+#ifdef CONFIG_GIGASET_DEBUG
+ bcs->emptycount = 0;
+#endif
+
+ bcs->rx_bufsize = 0;
+ bcs->rx_skb = NULL;
+ bcs->rx_fcs = PPP_INITFCS;
+ bcs->inputstate = 0;
+ 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;
+
+ spin_lock_init(&bcs->aplock);
+ bcs->ap = NULL;
+ bcs->apconnstate = 0;
+
+ gig_dbg(DEBUG_INIT, " setting up bcs[%d]->hw", channel);
+ return cs->ops->initbcshw(bcs);
+}
+
+/**
+ * gigaset_initcs() - initialize device structure
+ * @drv: hardware driver the device belongs to
+ * @channels: number of B channels supported by device
+ * @onechannel: !=0 if B channel data and AT commands share one
+ * communication channel (M10x),
+ * ==0 if B channels have separate communication channels (base)
+ * @ignoreframes: number of frames to ignore after setting up B channel
+ * @cidmode: !=0: start in CallID mode
+ * @modulename: name of driver module for LL registration
+ *
+ * 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
+ *
+ * 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;
+ unsigned long flags;
+ int i;
+
+ gig_dbg(DEBUG_INIT, "allocating cs");
+ cs = alloc_cs(drv);
+ if (!cs) {
+ pr_err("maximum number of devices exceeded\n");
+ return NULL;
+ }
+
+ 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);
+ tty_port_init(&cs->port);
+ cs->commands_pending = 0;
+ cs->cur_at_seq = 0;
+ cs->gotfwver = -1;
+ cs->dev = NULL;
+ cs->tty_dev = NULL;
+ cs->cidmode = cidmode != 0;
+ cs->tabnocid = gigaset_tab_nocid;
+ cs->tabcid = gigaset_tab_cid;
+
+ init_waitqueue_head(&cs->waitqueue);
+ cs->waiting = 0;
+
+ cs->mode = M_UNKNOWN;
+ cs->mstate = MS_UNINITIALIZED;
+
+ cs->bcs = kmalloc(channels * sizeof(struct bc_state), GFP_KERNEL);
+ cs->inbuf = kmalloc(sizeof(struct inbuf_t), GFP_KERNEL);
+ if (!cs->bcs || !cs->inbuf) {
+ pr_err("out of memory\n");
+ 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");
+ gigaset_inbuf_init(cs->inbuf, cs);
+
+ 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_isdn_regdev(cs, modulename) < 0) {
+ pr_err("error registering ISDN device\n");
+ goto error;
+ }
+
+ make_valid(cs, VALID_ID);
+ ++cs->cs_init;
+ gig_dbg(DEBUG_INIT, "setting up hw");
+ if (cs->ops->initcshw(cs) < 0)
+ goto error;
+
+ ++cs->cs_init;
+
+ /* set up character device */
+ gigaset_if_init(cs);
+
+ /* set up device sysfs */
+ gigaset_init_dev_sysfs(cs);
+
+ /* set up channel data structures */
+ for (i = 0; i < channels; ++i) {
+ gig_dbg(DEBUG_INIT, "setting up bcs[%d]", i);
+ if (gigaset_initbcs(cs->bcs + i, cs, i) < 0) {
+ pr_err("could not allocate channel %d data\n", i);
+ goto error;
+ }
+ }
+
+ 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);
+ 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->rx_fcs = PPP_INITFCS;
+ bcs->chstate = 0;
+
+ bcs->ignore = cs->ignoreframes;
+ dev_kfree_skb(bcs->rx_skb);
+ bcs->rx_skb = NULL;
+
+ 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);
+
+ cs->mode = M_UNKNOWN;
+ cs->mstate = MS_UNINITIALIZED;
+
+ clear_at_state(&cs->at_state);
+ dealloc_temp_at_states(cs);
+ gigaset_at_init(&cs->at_state, NULL, cs, 0);
+
+ cs->inbuf->inputstate = INS_command;
+ cs->inbuf->head = 0;
+ 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;
+ 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) < 0)
+ pr_err("could not allocate channel %d data\n", i);
+ }
+
+ if (cs->waiting) {
+ cs->cmd_result = -ENODEV;
+ cs->waiting = 0;
+ wake_up_interruptible(&cs->waitqueue);
+ }
+}
+
+
+/**
+ * gigaset_start() - start device operations
+ * @cs: device descriptor structure.
+ *
+ * Prepares the device for use by setting up communication parameters,
+ * scheduling an EV_START event to initiate device initialization, and
+ * waiting for completion of the initialization.
+ *
+ * Return value:
+ * 0 on success, error code < 0 on failure
+ */
+int gigaset_start(struct cardstate *cs)
+{
+ unsigned long flags;
+
+ if (mutex_lock_interruptible(&cs->mutex))
+ return -EBUSY;
+
+ spin_lock_irqsave(&cs->lock, flags);
+ cs->connected = 1;
+ spin_unlock_irqrestore(&cs->lock, flags);
+
+ if (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;
+ }
+
+ cs->waiting = 1;
+
+ if (!gigaset_add_event(cs, &cs->at_state, EV_START, NULL, 0, NULL)) {
+ cs->waiting = 0;
+ goto error;
+ }
+ gigaset_schedule_event(cs);
+
+ wait_event(cs->waitqueue, !cs->waiting);
+
+ mutex_unlock(&cs->mutex);
+ return 0;
+
+error:
+ mutex_unlock(&cs->mutex);
+ return -ENOMEM;
+}
+EXPORT_SYMBOL_GPL(gigaset_start);
+
+/**
+ * gigaset_shutdown() - shut down device operations
+ * @cs: device descriptor structure.
+ *
+ * Deactivates the device by scheduling an EV_SHUTDOWN event and
+ * waiting for completion of the shutdown.
+ *
+ * Return value:
+ * 0 - success, -ENODEV - error (no device associated)
+ */
+int gigaset_shutdown(struct cardstate *cs)
+{
+ mutex_lock(&cs->mutex);
+
+ if (!(cs->flags & VALID_MINOR)) {
+ mutex_unlock(&cs->mutex);
+ return -ENODEV;
+ }
+
+ cs->waiting = 1;
+
+ if (!gigaset_add_event(cs, &cs->at_state, EV_SHUTDOWN, NULL, 0, NULL))
+ goto exit;
+ gigaset_schedule_event(cs);
+
+ wait_event(cs->waitqueue, !cs->waiting);
+
+ cleanup_cs(cs);
+
+exit:
+ mutex_unlock(&cs->mutex);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(gigaset_shutdown);
+
+/**
+ * gigaset_stop() - stop device operations
+ * @cs: device descriptor structure.
+ *
+ * Stops operations on the device by scheduling an EV_STOP event and
+ * waiting for completion of the 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))
+ goto exit;
+ 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) {
+ cs = drv->cs + i;
+ if ((cs->flags & VALID_ID) && cs->myid == id) {
+ ret = cs;
+ break;
+ }
+ }
+ spin_unlock(&drv->lock);
+ if (ret)
+ break;
+ }
+ spin_unlock_irqrestore(&driver_lock, flags);
+ return ret;
+}
+
+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->cs[index].flags & 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)
+{
+ return gigaset_get_cs_by_minor(tty->index + tty->driver->minor_start);
+}
+
+/**
+ * gigaset_freedriver() - free all associated ressources of a driver
+ * @drv: driver descriptor structure.
+ *
+ * Unregisters the driver from the system and deallocates the driver
+ * structure @drv and all structures referenced from it.
+ * All devices should be shut down before calling this.
+ */
+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);
+}
+EXPORT_SYMBOL_GPL(gigaset_freedriver);
+
+/**
+ * gigaset_initdriver() - initialize driver structure
+ * @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)
+ *
+ * Allocate and initialize gigaset_driver structure. Initialize interface.
+ *
+ * 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;
+
+ for (i = 0; i < minors; ++i) {
+ drv->cs[i].flags = 0;
+ drv->cs[i].driver = drv;
+ drv->cs[i].ops = drv->ops;
+ drv->cs[i].minor_index = i;
+ mutex_init(&drv->cs[i].mutex);
+ }
+
+ 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);
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(gigaset_initdriver);
+
+/**
+ * gigaset_blockdriver() - block driver
+ * @drv: driver descriptor structure.
+ *
+ * Prevents the driver from attaching new devices, in preparation for
+ * deregistration.
+ */
+void gigaset_blockdriver(struct gigaset_driver *drv)
+{
+ drv->blocked = 1;
+}
+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;
+
+ pr_info(DRIVER_DESC DRIVER_DESC_DEBUG "\n");
+ gigaset_isdn_regdrv();
+ return 0;
+}
+
+static void __exit gigaset_exit_module(void)
+{
+ gigaset_isdn_unregdrv();
+}
+
+module_init(gigaset_init_module);
+module_exit(gigaset_exit_module);
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff