- 根目录:
- drivers
- isdn
- gigaset
- 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/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 0;
}
++bcs->use_count;
bcs->busy = 1;
gig_dbg(DEBUG_CHANNEL, "allocated channel %d", bcs->channel);
spin_unlock_irqrestore(&bcs->cs->lock, flags);
return 1;
}
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 0;
}
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 1;
}
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 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);
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);
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 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_at_states(cs);
/* fall through */
case 0: /* error in basic setup */
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 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.
*/
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 struct bc_state *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);
if (cs->ops->initbcshw(bcs))
return bcs;
gig_dbg(DEBUG_INIT, " failed");
return NULL;
}
/**
* 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;
}
gig_dbg(DEBUG_INIT, "allocating bcs[0..%d]", channels - 1);
cs->bcs = kmalloc(channels * sizeof(struct bc_state), GFP_KERNEL);
if (!cs->bcs) {
pr_err("out of memory\n");
goto error;
}
gig_dbg(DEBUG_INIT, "allocating inbuf");
cs->inbuf = kmalloc(sizeof(struct inbuf_t), GFP_KERNEL);
if (!cs->inbuf) {
pr_err("out of memory\n");
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);
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;
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->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)) {
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))
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)) {
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_at_states(cs);
free_strings(&cs->at_state);
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))
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:
* 1 - success, 0 - error
*/
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 (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 1;
error:
mutex_unlock(&cs->mutex);
return 0;
}
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, -1 - error (no device associated)
*/
int gigaset_shutdown(struct cardstate *cs)
{
mutex_lock(&cs->mutex);
if (!(cs->flags & VALID_MINOR)) {
mutex_unlock(&cs->mutex);
return -1;
}
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)
{
if (tty->index < 0 || tty->index >= tty->driver->num)
return NULL;
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->cs);
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");