diff options
Diffstat (limited to 'drivers/staging/isdn/gigaset/common.c')
| -rw-r--r-- | drivers/staging/isdn/gigaset/common.c | 1153 |
1 files changed, 1153 insertions, 0 deletions
diff --git a/drivers/staging/isdn/gigaset/common.c b/drivers/staging/isdn/gigaset/common.c new file mode 100644 index 000000000000..3bb8092858ab --- /dev/null +++ b/drivers/staging/isdn/gigaset/common.c @@ -0,0 +1,1153 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Stuff used by all variants of the driver + * + * Copyright (c) 2001 by Stefan Eilers, + * Hansjoerg Lipp <hjlipp@web.de>, + * Tilman Schmidt <tilman@imap.cc>. + * + * ===================================================================== + * ===================================================================== + */ + +#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(struct timer_list *t) +{ + struct cardstate *cs = from_timer(cs, t, timer); + 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; + timer_setup(&cs->timer, timer_tick, 0); + 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_array(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); + 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_array(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"); |