linux/drivers/isdn/gigaset/common.c
Tilman Schmidt 81fa7b8257 isdn/gigaset: unify function return values
Various functions in the Gigaset driver were using different
conventions for the meaning of their int return values.
Align them to the usual negative error numbers convention.

Inspired-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Tilman Schmidt <tilman@imap.cc>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-05-07 22:37:56 -04:00

1171 lines
26 KiB
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 -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);
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_temp_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.
*
* 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;
}
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);
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->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->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");