/* * Stuff used by all variants of the driver * * Copyright (c) 2001 by Stefan Eilers, * Hansjoerg Lipp , * Tilman Schmidt . * * ===================================================================== * 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 #include /* Version Information */ #define DRIVER_AUTHOR "Hansjoerg Lipp , Tilman Schmidt , 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); tty_port_destroy(&cs->port); 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_port; } make_valid(cs, VALID_ID); ++cs->cs_init; gig_dbg(DEBUG_INIT, "setting up hw"); if (cs->ops->initcshw(cs) < 0) goto error_port; ++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_port; } } 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_port: tty_port_destroy(&cs->port); 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");