linux/net/irda/ircomm/ircomm_tty_attach.c
Jeff Kirsher d37705092f net/irda: Fix FSF address in file headers
Several files refer to an old address for the Free Software Foundation
in the file header comment.  Resolve by replacing the address with
the URL <http://www.gnu.org/licenses/> so that we do not have to keep
updating the header comments anytime the address changes.

CC: Samuel Ortiz <samuel@sortiz.org>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2013-12-06 12:37:57 -05:00

1010 lines
27 KiB
C

/*********************************************************************
*
* Filename: ircomm_tty_attach.c
* Version:
* Description: Code for attaching the serial driver to IrCOMM
* Status: Experimental.
* Author: Dag Brattli <dagb@cs.uit.no>
* Created at: Sat Jun 5 17:42:00 1999
* Modified at: Tue Jan 4 14:20:49 2000
* Modified by: Dag Brattli <dagb@cs.uit.no>
*
* Copyright (c) 1999-2000 Dag Brattli, All Rights Reserved.
* Copyright (c) 2000-2003 Jean Tourrilhes <jt@hpl.hp.com>
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*
********************************************************************/
#include <linux/init.h>
#include <linux/sched.h>
#include <net/irda/irda.h>
#include <net/irda/irlmp.h>
#include <net/irda/iriap.h>
#include <net/irda/irttp.h>
#include <net/irda/irias_object.h>
#include <net/irda/parameters.h>
#include <net/irda/ircomm_core.h>
#include <net/irda/ircomm_param.h>
#include <net/irda/ircomm_event.h>
#include <net/irda/ircomm_tty.h>
#include <net/irda/ircomm_tty_attach.h>
static void ircomm_tty_ias_register(struct ircomm_tty_cb *self);
static void ircomm_tty_discovery_indication(discinfo_t *discovery,
DISCOVERY_MODE mode,
void *priv);
static void ircomm_tty_getvalue_confirm(int result, __u16 obj_id,
struct ias_value *value, void *priv);
static void ircomm_tty_start_watchdog_timer(struct ircomm_tty_cb *self,
int timeout);
static void ircomm_tty_watchdog_timer_expired(void *data);
static int ircomm_tty_state_idle(struct ircomm_tty_cb *self,
IRCOMM_TTY_EVENT event,
struct sk_buff *skb,
struct ircomm_tty_info *info);
static int ircomm_tty_state_search(struct ircomm_tty_cb *self,
IRCOMM_TTY_EVENT event,
struct sk_buff *skb,
struct ircomm_tty_info *info);
static int ircomm_tty_state_query_parameters(struct ircomm_tty_cb *self,
IRCOMM_TTY_EVENT event,
struct sk_buff *skb,
struct ircomm_tty_info *info);
static int ircomm_tty_state_query_lsap_sel(struct ircomm_tty_cb *self,
IRCOMM_TTY_EVENT event,
struct sk_buff *skb,
struct ircomm_tty_info *info);
static int ircomm_tty_state_setup(struct ircomm_tty_cb *self,
IRCOMM_TTY_EVENT event,
struct sk_buff *skb,
struct ircomm_tty_info *info);
static int ircomm_tty_state_ready(struct ircomm_tty_cb *self,
IRCOMM_TTY_EVENT event,
struct sk_buff *skb,
struct ircomm_tty_info *info);
const char *const ircomm_tty_state[] = {
"IRCOMM_TTY_IDLE",
"IRCOMM_TTY_SEARCH",
"IRCOMM_TTY_QUERY_PARAMETERS",
"IRCOMM_TTY_QUERY_LSAP_SEL",
"IRCOMM_TTY_SETUP",
"IRCOMM_TTY_READY",
"*** ERROR *** ",
};
#ifdef CONFIG_IRDA_DEBUG
static const char *const ircomm_tty_event[] = {
"IRCOMM_TTY_ATTACH_CABLE",
"IRCOMM_TTY_DETACH_CABLE",
"IRCOMM_TTY_DATA_REQUEST",
"IRCOMM_TTY_DATA_INDICATION",
"IRCOMM_TTY_DISCOVERY_REQUEST",
"IRCOMM_TTY_DISCOVERY_INDICATION",
"IRCOMM_TTY_CONNECT_CONFIRM",
"IRCOMM_TTY_CONNECT_INDICATION",
"IRCOMM_TTY_DISCONNECT_REQUEST",
"IRCOMM_TTY_DISCONNECT_INDICATION",
"IRCOMM_TTY_WD_TIMER_EXPIRED",
"IRCOMM_TTY_GOT_PARAMETERS",
"IRCOMM_TTY_GOT_LSAPSEL",
"*** ERROR ****",
};
#endif /* CONFIG_IRDA_DEBUG */
static int (*state[])(struct ircomm_tty_cb *self, IRCOMM_TTY_EVENT event,
struct sk_buff *skb, struct ircomm_tty_info *info) =
{
ircomm_tty_state_idle,
ircomm_tty_state_search,
ircomm_tty_state_query_parameters,
ircomm_tty_state_query_lsap_sel,
ircomm_tty_state_setup,
ircomm_tty_state_ready,
};
/*
* Function ircomm_tty_attach_cable (driver)
*
* Try to attach cable (IrCOMM link). This function will only return
* when the link has been connected, or if an error condition occurs.
* If success, the return value is the resulting service type.
*/
int ircomm_tty_attach_cable(struct ircomm_tty_cb *self)
{
struct tty_struct *tty;
IRDA_DEBUG(0, "%s()\n", __func__ );
IRDA_ASSERT(self != NULL, return -1;);
IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
/* Check if somebody has already connected to us */
if (ircomm_is_connected(self->ircomm)) {
IRDA_DEBUG(0, "%s(), already connected!\n", __func__ );
return 0;
}
/* Make sure nobody tries to write before the link is up */
tty = tty_port_tty_get(&self->port);
if (tty) {
tty->hw_stopped = 1;
tty_kref_put(tty);
}
ircomm_tty_ias_register(self);
ircomm_tty_do_event(self, IRCOMM_TTY_ATTACH_CABLE, NULL, NULL);
return 0;
}
/*
* Function ircomm_detach_cable (driver)
*
* Detach cable, or cable has been detached by peer
*
*/
void ircomm_tty_detach_cable(struct ircomm_tty_cb *self)
{
IRDA_DEBUG(0, "%s()\n", __func__ );
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
del_timer(&self->watchdog_timer);
/* Remove discovery handler */
if (self->ckey) {
irlmp_unregister_client(self->ckey);
self->ckey = NULL;
}
/* Remove IrCOMM hint bits */
if (self->skey) {
irlmp_unregister_service(self->skey);
self->skey = NULL;
}
if (self->iriap) {
iriap_close(self->iriap);
self->iriap = NULL;
}
/* Remove LM-IAS object */
if (self->obj) {
irias_delete_object(self->obj);
self->obj = NULL;
}
ircomm_tty_do_event(self, IRCOMM_TTY_DETACH_CABLE, NULL, NULL);
/* Reset some values */
self->daddr = self->saddr = 0;
self->dlsap_sel = self->slsap_sel = 0;
memset(&self->settings, 0, sizeof(struct ircomm_params));
}
/*
* Function ircomm_tty_ias_register (self)
*
* Register with LM-IAS depending on which service type we are
*
*/
static void ircomm_tty_ias_register(struct ircomm_tty_cb *self)
{
__u8 oct_seq[6];
__u16 hints;
IRDA_DEBUG(0, "%s()\n", __func__ );
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
/* Compute hint bits based on service */
hints = irlmp_service_to_hint(S_COMM);
if (self->service_type & IRCOMM_3_WIRE_RAW)
hints |= irlmp_service_to_hint(S_PRINTER);
/* Advertise IrCOMM hint bit in discovery */
if (!self->skey)
self->skey = irlmp_register_service(hints);
/* Set up a discovery handler */
if (!self->ckey)
self->ckey = irlmp_register_client(hints,
ircomm_tty_discovery_indication,
NULL, (void *) self);
/* If already done, no need to do it again */
if (self->obj)
return;
if (self->service_type & IRCOMM_3_WIRE_RAW) {
/* Register IrLPT with LM-IAS */
self->obj = irias_new_object("IrLPT", IAS_IRLPT_ID);
irias_add_integer_attrib(self->obj, "IrDA:IrLMP:LsapSel",
self->slsap_sel, IAS_KERNEL_ATTR);
} else {
/* Register IrCOMM with LM-IAS */
self->obj = irias_new_object("IrDA:IrCOMM", IAS_IRCOMM_ID);
irias_add_integer_attrib(self->obj, "IrDA:TinyTP:LsapSel",
self->slsap_sel, IAS_KERNEL_ATTR);
/* Code the parameters into the buffer */
irda_param_pack(oct_seq, "bbbbbb",
IRCOMM_SERVICE_TYPE, 1, self->service_type,
IRCOMM_PORT_TYPE, 1, IRCOMM_SERIAL);
/* Register parameters with LM-IAS */
irias_add_octseq_attrib(self->obj, "Parameters", oct_seq, 6,
IAS_KERNEL_ATTR);
}
irias_insert_object(self->obj);
}
/*
* Function ircomm_tty_ias_unregister (self)
*
* Remove our IAS object and client hook while connected.
*
*/
static void ircomm_tty_ias_unregister(struct ircomm_tty_cb *self)
{
/* Remove LM-IAS object now so it is not reused.
* IrCOMM deals very poorly with multiple incoming connections.
* It should looks a lot more like IrNET, and "dup" a server TSAP
* to the application TSAP (based on various rules).
* This is a cheap workaround allowing multiple clients to
* connect to us. It will not always work.
* Each IrCOMM socket has an IAS entry. Incoming connection will
* pick the first one found. So, when we are fully connected,
* we remove our IAS entries so that the next IAS entry is used.
* We do that for *both* client and server, because a server
* can also create client instances.
* Jean II */
if (self->obj) {
irias_delete_object(self->obj);
self->obj = NULL;
}
#if 0
/* Remove discovery handler.
* While we are connected, we no longer need to receive
* discovery events. This would be the case if there is
* multiple IrLAP interfaces. Jean II */
if (self->ckey) {
irlmp_unregister_client(self->ckey);
self->ckey = NULL;
}
#endif
}
/*
* Function ircomm_send_initial_parameters (self)
*
* Send initial parameters to the remote IrCOMM device. These parameters
* must be sent before any data.
*/
int ircomm_tty_send_initial_parameters(struct ircomm_tty_cb *self)
{
IRDA_ASSERT(self != NULL, return -1;);
IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
if (self->service_type & IRCOMM_3_WIRE_RAW)
return 0;
/*
* Set default values, but only if the application for some reason
* haven't set them already
*/
IRDA_DEBUG(2, "%s(), data-rate = %d\n", __func__ ,
self->settings.data_rate);
if (!self->settings.data_rate)
self->settings.data_rate = 9600;
IRDA_DEBUG(2, "%s(), data-format = %d\n", __func__ ,
self->settings.data_format);
if (!self->settings.data_format)
self->settings.data_format = IRCOMM_WSIZE_8; /* 8N1 */
IRDA_DEBUG(2, "%s(), flow-control = %d\n", __func__ ,
self->settings.flow_control);
/*self->settings.flow_control = IRCOMM_RTS_CTS_IN|IRCOMM_RTS_CTS_OUT;*/
/* Do not set delta values for the initial parameters */
self->settings.dte = IRCOMM_DTR | IRCOMM_RTS;
/* Only send service type parameter when we are the client */
if (self->client)
ircomm_param_request(self, IRCOMM_SERVICE_TYPE, FALSE);
ircomm_param_request(self, IRCOMM_DATA_RATE, FALSE);
ircomm_param_request(self, IRCOMM_DATA_FORMAT, FALSE);
/* For a 3 wire service, we just flush the last parameter and return */
if (self->settings.service_type == IRCOMM_3_WIRE) {
ircomm_param_request(self, IRCOMM_FLOW_CONTROL, TRUE);
return 0;
}
/* Only 9-wire service types continue here */
ircomm_param_request(self, IRCOMM_FLOW_CONTROL, FALSE);
#if 0
ircomm_param_request(self, IRCOMM_XON_XOFF, FALSE);
ircomm_param_request(self, IRCOMM_ENQ_ACK, FALSE);
#endif
/* Notify peer that we are ready to receive data */
ircomm_param_request(self, IRCOMM_DTE, TRUE);
return 0;
}
/*
* Function ircomm_tty_discovery_indication (discovery)
*
* Remote device is discovered, try query the remote IAS to see which
* device it is, and which services it has.
*
*/
static void ircomm_tty_discovery_indication(discinfo_t *discovery,
DISCOVERY_MODE mode,
void *priv)
{
struct ircomm_tty_cb *self;
struct ircomm_tty_info info;
IRDA_DEBUG(2, "%s()\n", __func__ );
/* Important note :
* We need to drop all passive discoveries.
* The LSAP management of IrComm is deficient and doesn't deal
* with the case of two instance connecting to each other
* simultaneously (it will deadlock in LMP).
* The proper fix would be to use the same technique as in IrNET,
* to have one server socket and separate instances for the
* connecting/connected socket.
* The workaround is to drop passive discovery, which drastically
* reduce the probability of this happening.
* Jean II */
if(mode == DISCOVERY_PASSIVE)
return;
info.daddr = discovery->daddr;
info.saddr = discovery->saddr;
self = priv;
ircomm_tty_do_event(self, IRCOMM_TTY_DISCOVERY_INDICATION,
NULL, &info);
}
/*
* Function ircomm_tty_disconnect_indication (instance, sap, reason, skb)
*
* Link disconnected
*
*/
void ircomm_tty_disconnect_indication(void *instance, void *sap,
LM_REASON reason,
struct sk_buff *skb)
{
struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
struct tty_struct *tty;
IRDA_DEBUG(2, "%s()\n", __func__ );
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
tty = tty_port_tty_get(&self->port);
if (!tty)
return;
/* This will stop control data transfers */
self->flow = FLOW_STOP;
/* Stop data transfers */
tty->hw_stopped = 1;
ircomm_tty_do_event(self, IRCOMM_TTY_DISCONNECT_INDICATION, NULL,
NULL);
tty_kref_put(tty);
}
/*
* Function ircomm_tty_getvalue_confirm (result, obj_id, value, priv)
*
* Got result from the IAS query we make
*
*/
static void ircomm_tty_getvalue_confirm(int result, __u16 obj_id,
struct ias_value *value,
void *priv)
{
struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) priv;
IRDA_DEBUG(2, "%s()\n", __func__ );
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
/* We probably don't need to make any more queries */
iriap_close(self->iriap);
self->iriap = NULL;
/* Check if request succeeded */
if (result != IAS_SUCCESS) {
IRDA_DEBUG(4, "%s(), got NULL value!\n", __func__ );
return;
}
switch (value->type) {
case IAS_OCT_SEQ:
IRDA_DEBUG(2, "%s(), got octet sequence\n", __func__ );
irda_param_extract_all(self, value->t.oct_seq, value->len,
&ircomm_param_info);
ircomm_tty_do_event(self, IRCOMM_TTY_GOT_PARAMETERS, NULL,
NULL);
break;
case IAS_INTEGER:
/* Got LSAP selector */
IRDA_DEBUG(2, "%s(), got lsapsel = %d\n", __func__ ,
value->t.integer);
if (value->t.integer == -1) {
IRDA_DEBUG(0, "%s(), invalid value!\n", __func__ );
} else
self->dlsap_sel = value->t.integer;
ircomm_tty_do_event(self, IRCOMM_TTY_GOT_LSAPSEL, NULL, NULL);
break;
case IAS_MISSING:
IRDA_DEBUG(0, "%s(), got IAS_MISSING\n", __func__ );
break;
default:
IRDA_DEBUG(0, "%s(), got unknown type!\n", __func__ );
break;
}
irias_delete_value(value);
}
/*
* Function ircomm_tty_connect_confirm (instance, sap, qos, max_sdu_size, skb)
*
* Connection confirmed
*
*/
void ircomm_tty_connect_confirm(void *instance, void *sap,
struct qos_info *qos,
__u32 max_data_size,
__u8 max_header_size,
struct sk_buff *skb)
{
struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
IRDA_DEBUG(2, "%s()\n", __func__ );
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
self->client = TRUE;
self->max_data_size = max_data_size;
self->max_header_size = max_header_size;
self->flow = FLOW_START;
ircomm_tty_do_event(self, IRCOMM_TTY_CONNECT_CONFIRM, NULL, NULL);
/* No need to kfree_skb - see ircomm_ttp_connect_confirm() */
}
/*
* Function ircomm_tty_connect_indication (instance, sap, qos, max_sdu_size,
* skb)
*
* we are discovered and being requested to connect by remote device !
*
*/
void ircomm_tty_connect_indication(void *instance, void *sap,
struct qos_info *qos,
__u32 max_data_size,
__u8 max_header_size,
struct sk_buff *skb)
{
struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
int clen;
IRDA_DEBUG(2, "%s()\n", __func__ );
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
self->client = FALSE;
self->max_data_size = max_data_size;
self->max_header_size = max_header_size;
self->flow = FLOW_START;
clen = skb->data[0];
if (clen)
irda_param_extract_all(self, skb->data+1,
IRDA_MIN(skb->len, clen),
&ircomm_param_info);
ircomm_tty_do_event(self, IRCOMM_TTY_CONNECT_INDICATION, NULL, NULL);
/* No need to kfree_skb - see ircomm_ttp_connect_indication() */
}
/*
* Function ircomm_tty_link_established (self)
*
* Called when the IrCOMM link is established
*
*/
void ircomm_tty_link_established(struct ircomm_tty_cb *self)
{
struct tty_struct *tty;
IRDA_DEBUG(2, "%s()\n", __func__ );
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
tty = tty_port_tty_get(&self->port);
if (!tty)
return;
del_timer(&self->watchdog_timer);
/*
* IrCOMM link is now up, and if we are not using hardware
* flow-control, then declare the hardware as running. Otherwise we
* will have to wait for the peer device (DCE) to raise the CTS
* line.
*/
if (tty_port_cts_enabled(&self->port) &&
((self->settings.dce & IRCOMM_CTS) == 0)) {
IRDA_DEBUG(0, "%s(), waiting for CTS ...\n", __func__ );
goto put;
} else {
IRDA_DEBUG(1, "%s(), starting hardware!\n", __func__ );
tty->hw_stopped = 0;
/* Wake up processes blocked on open */
wake_up_interruptible(&self->port.open_wait);
}
schedule_work(&self->tqueue);
put:
tty_kref_put(tty);
}
/*
* Function ircomm_tty_start_watchdog_timer (self, timeout)
*
* Start the watchdog timer. This timer is used to make sure that any
* connection attempt is successful, and if not, we will retry after
* the timeout
*/
static void ircomm_tty_start_watchdog_timer(struct ircomm_tty_cb *self,
int timeout)
{
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
irda_start_timer(&self->watchdog_timer, timeout, (void *) self,
ircomm_tty_watchdog_timer_expired);
}
/*
* Function ircomm_tty_watchdog_timer_expired (data)
*
* Called when the connect procedure have taken to much time.
*
*/
static void ircomm_tty_watchdog_timer_expired(void *data)
{
struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) data;
IRDA_DEBUG(2, "%s()\n", __func__ );
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
ircomm_tty_do_event(self, IRCOMM_TTY_WD_TIMER_EXPIRED, NULL, NULL);
}
/*
* Function ircomm_tty_do_event (self, event, skb)
*
* Process event
*
*/
int ircomm_tty_do_event(struct ircomm_tty_cb *self, IRCOMM_TTY_EVENT event,
struct sk_buff *skb, struct ircomm_tty_info *info)
{
IRDA_ASSERT(self != NULL, return -1;);
IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
IRDA_DEBUG(2, "%s: state=%s, event=%s\n", __func__ ,
ircomm_tty_state[self->state], ircomm_tty_event[event]);
return (*state[self->state])(self, event, skb, info);
}
/*
* Function ircomm_tty_next_state (self, state)
*
* Switch state
*
*/
static inline void ircomm_tty_next_state(struct ircomm_tty_cb *self, IRCOMM_TTY_STATE state)
{
/*
IRDA_ASSERT(self != NULL, return;);
IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return;);
IRDA_DEBUG(2, "%s: next state=%s, service type=%d\n", __func__ ,
ircomm_tty_state[self->state], self->service_type);
*/
self->state = state;
}
/*
* Function ircomm_tty_state_idle (self, event, skb, info)
*
* Just hanging around
*
*/
static int ircomm_tty_state_idle(struct ircomm_tty_cb *self,
IRCOMM_TTY_EVENT event,
struct sk_buff *skb,
struct ircomm_tty_info *info)
{
int ret = 0;
IRDA_DEBUG(2, "%s: state=%s, event=%s\n", __func__ ,
ircomm_tty_state[self->state], ircomm_tty_event[event]);
switch (event) {
case IRCOMM_TTY_ATTACH_CABLE:
/* Try to discover any remote devices */
ircomm_tty_start_watchdog_timer(self, 3*HZ);
ircomm_tty_next_state(self, IRCOMM_TTY_SEARCH);
irlmp_discovery_request(DISCOVERY_DEFAULT_SLOTS);
break;
case IRCOMM_TTY_DISCOVERY_INDICATION:
self->daddr = info->daddr;
self->saddr = info->saddr;
if (self->iriap) {
IRDA_WARNING("%s(), busy with a previous query\n",
__func__);
return -EBUSY;
}
self->iriap = iriap_open(LSAP_ANY, IAS_CLIENT, self,
ircomm_tty_getvalue_confirm);
iriap_getvaluebyclass_request(self->iriap,
self->saddr, self->daddr,
"IrDA:IrCOMM", "Parameters");
ircomm_tty_start_watchdog_timer(self, 3*HZ);
ircomm_tty_next_state(self, IRCOMM_TTY_QUERY_PARAMETERS);
break;
case IRCOMM_TTY_CONNECT_INDICATION:
del_timer(&self->watchdog_timer);
/* Accept connection */
ircomm_connect_response(self->ircomm, NULL);
ircomm_tty_next_state(self, IRCOMM_TTY_READY);
break;
case IRCOMM_TTY_WD_TIMER_EXPIRED:
/* Just stay idle */
break;
case IRCOMM_TTY_DETACH_CABLE:
ircomm_tty_next_state(self, IRCOMM_TTY_IDLE);
break;
default:
IRDA_DEBUG(2, "%s(), unknown event: %s\n", __func__ ,
ircomm_tty_event[event]);
ret = -EINVAL;
}
return ret;
}
/*
* Function ircomm_tty_state_search (self, event, skb, info)
*
* Trying to discover an IrCOMM device
*
*/
static int ircomm_tty_state_search(struct ircomm_tty_cb *self,
IRCOMM_TTY_EVENT event,
struct sk_buff *skb,
struct ircomm_tty_info *info)
{
int ret = 0;
IRDA_DEBUG(2, "%s: state=%s, event=%s\n", __func__ ,
ircomm_tty_state[self->state], ircomm_tty_event[event]);
switch (event) {
case IRCOMM_TTY_DISCOVERY_INDICATION:
self->daddr = info->daddr;
self->saddr = info->saddr;
if (self->iriap) {
IRDA_WARNING("%s(), busy with a previous query\n",
__func__);
return -EBUSY;
}
self->iriap = iriap_open(LSAP_ANY, IAS_CLIENT, self,
ircomm_tty_getvalue_confirm);
if (self->service_type == IRCOMM_3_WIRE_RAW) {
iriap_getvaluebyclass_request(self->iriap, self->saddr,
self->daddr, "IrLPT",
"IrDA:IrLMP:LsapSel");
ircomm_tty_next_state(self, IRCOMM_TTY_QUERY_LSAP_SEL);
} else {
iriap_getvaluebyclass_request(self->iriap, self->saddr,
self->daddr,
"IrDA:IrCOMM",
"Parameters");
ircomm_tty_next_state(self, IRCOMM_TTY_QUERY_PARAMETERS);
}
ircomm_tty_start_watchdog_timer(self, 3*HZ);
break;
case IRCOMM_TTY_CONNECT_INDICATION:
del_timer(&self->watchdog_timer);
ircomm_tty_ias_unregister(self);
/* Accept connection */
ircomm_connect_response(self->ircomm, NULL);
ircomm_tty_next_state(self, IRCOMM_TTY_READY);
break;
case IRCOMM_TTY_WD_TIMER_EXPIRED:
#if 1
/* Give up */
#else
/* Try to discover any remote devices */
ircomm_tty_start_watchdog_timer(self, 3*HZ);
irlmp_discovery_request(DISCOVERY_DEFAULT_SLOTS);
#endif
break;
case IRCOMM_TTY_DETACH_CABLE:
ircomm_tty_next_state(self, IRCOMM_TTY_IDLE);
break;
default:
IRDA_DEBUG(2, "%s(), unknown event: %s\n", __func__ ,
ircomm_tty_event[event]);
ret = -EINVAL;
}
return ret;
}
/*
* Function ircomm_tty_state_query (self, event, skb, info)
*
* Querying the remote LM-IAS for IrCOMM parameters
*
*/
static int ircomm_tty_state_query_parameters(struct ircomm_tty_cb *self,
IRCOMM_TTY_EVENT event,
struct sk_buff *skb,
struct ircomm_tty_info *info)
{
int ret = 0;
IRDA_DEBUG(2, "%s: state=%s, event=%s\n", __func__ ,
ircomm_tty_state[self->state], ircomm_tty_event[event]);
switch (event) {
case IRCOMM_TTY_GOT_PARAMETERS:
if (self->iriap) {
IRDA_WARNING("%s(), busy with a previous query\n",
__func__);
return -EBUSY;
}
self->iriap = iriap_open(LSAP_ANY, IAS_CLIENT, self,
ircomm_tty_getvalue_confirm);
iriap_getvaluebyclass_request(self->iriap, self->saddr,
self->daddr, "IrDA:IrCOMM",
"IrDA:TinyTP:LsapSel");
ircomm_tty_start_watchdog_timer(self, 3*HZ);
ircomm_tty_next_state(self, IRCOMM_TTY_QUERY_LSAP_SEL);
break;
case IRCOMM_TTY_WD_TIMER_EXPIRED:
/* Go back to search mode */
ircomm_tty_next_state(self, IRCOMM_TTY_SEARCH);
ircomm_tty_start_watchdog_timer(self, 3*HZ);
break;
case IRCOMM_TTY_CONNECT_INDICATION:
del_timer(&self->watchdog_timer);
ircomm_tty_ias_unregister(self);
/* Accept connection */
ircomm_connect_response(self->ircomm, NULL);
ircomm_tty_next_state(self, IRCOMM_TTY_READY);
break;
case IRCOMM_TTY_DETACH_CABLE:
ircomm_tty_next_state(self, IRCOMM_TTY_IDLE);
break;
default:
IRDA_DEBUG(2, "%s(), unknown event: %s\n", __func__ ,
ircomm_tty_event[event]);
ret = -EINVAL;
}
return ret;
}
/*
* Function ircomm_tty_state_query_lsap_sel (self, event, skb, info)
*
* Query remote LM-IAS for the LSAP selector which we can connect to
*
*/
static int ircomm_tty_state_query_lsap_sel(struct ircomm_tty_cb *self,
IRCOMM_TTY_EVENT event,
struct sk_buff *skb,
struct ircomm_tty_info *info)
{
int ret = 0;
IRDA_DEBUG(2, "%s: state=%s, event=%s\n", __func__ ,
ircomm_tty_state[self->state], ircomm_tty_event[event]);
switch (event) {
case IRCOMM_TTY_GOT_LSAPSEL:
/* Connect to remote device */
ret = ircomm_connect_request(self->ircomm, self->dlsap_sel,
self->saddr, self->daddr,
NULL, self->service_type);
ircomm_tty_start_watchdog_timer(self, 3*HZ);
ircomm_tty_next_state(self, IRCOMM_TTY_SETUP);
break;
case IRCOMM_TTY_WD_TIMER_EXPIRED:
/* Go back to search mode */
ircomm_tty_next_state(self, IRCOMM_TTY_SEARCH);
ircomm_tty_start_watchdog_timer(self, 3*HZ);
break;
case IRCOMM_TTY_CONNECT_INDICATION:
del_timer(&self->watchdog_timer);
ircomm_tty_ias_unregister(self);
/* Accept connection */
ircomm_connect_response(self->ircomm, NULL);
ircomm_tty_next_state(self, IRCOMM_TTY_READY);
break;
case IRCOMM_TTY_DETACH_CABLE:
ircomm_tty_next_state(self, IRCOMM_TTY_IDLE);
break;
default:
IRDA_DEBUG(2, "%s(), unknown event: %s\n", __func__ ,
ircomm_tty_event[event]);
ret = -EINVAL;
}
return ret;
}
/*
* Function ircomm_tty_state_setup (self, event, skb, info)
*
* Trying to connect
*
*/
static int ircomm_tty_state_setup(struct ircomm_tty_cb *self,
IRCOMM_TTY_EVENT event,
struct sk_buff *skb,
struct ircomm_tty_info *info)
{
int ret = 0;
IRDA_DEBUG(2, "%s: state=%s, event=%s\n", __func__ ,
ircomm_tty_state[self->state], ircomm_tty_event[event]);
switch (event) {
case IRCOMM_TTY_CONNECT_CONFIRM:
del_timer(&self->watchdog_timer);
ircomm_tty_ias_unregister(self);
/*
* Send initial parameters. This will also send out queued
* parameters waiting for the connection to come up
*/
ircomm_tty_send_initial_parameters(self);
ircomm_tty_link_established(self);
ircomm_tty_next_state(self, IRCOMM_TTY_READY);
break;
case IRCOMM_TTY_CONNECT_INDICATION:
del_timer(&self->watchdog_timer);
ircomm_tty_ias_unregister(self);
/* Accept connection */
ircomm_connect_response(self->ircomm, NULL);
ircomm_tty_next_state(self, IRCOMM_TTY_READY);
break;
case IRCOMM_TTY_WD_TIMER_EXPIRED:
/* Go back to search mode */
ircomm_tty_next_state(self, IRCOMM_TTY_SEARCH);
ircomm_tty_start_watchdog_timer(self, 3*HZ);
break;
case IRCOMM_TTY_DETACH_CABLE:
/* ircomm_disconnect_request(self->ircomm, NULL); */
ircomm_tty_next_state(self, IRCOMM_TTY_IDLE);
break;
default:
IRDA_DEBUG(2, "%s(), unknown event: %s\n", __func__ ,
ircomm_tty_event[event]);
ret = -EINVAL;
}
return ret;
}
/*
* Function ircomm_tty_state_ready (self, event, skb, info)
*
* IrCOMM is now connected
*
*/
static int ircomm_tty_state_ready(struct ircomm_tty_cb *self,
IRCOMM_TTY_EVENT event,
struct sk_buff *skb,
struct ircomm_tty_info *info)
{
int ret = 0;
switch (event) {
case IRCOMM_TTY_DATA_REQUEST:
ret = ircomm_data_request(self->ircomm, skb);
break;
case IRCOMM_TTY_DETACH_CABLE:
ircomm_disconnect_request(self->ircomm, NULL);
ircomm_tty_next_state(self, IRCOMM_TTY_IDLE);
break;
case IRCOMM_TTY_DISCONNECT_INDICATION:
ircomm_tty_ias_register(self);
ircomm_tty_next_state(self, IRCOMM_TTY_SEARCH);
ircomm_tty_start_watchdog_timer(self, 3*HZ);
if (self->port.flags & ASYNC_CHECK_CD) {
/* Drop carrier */
self->settings.dce = IRCOMM_DELTA_CD;
ircomm_tty_check_modem_status(self);
} else {
IRDA_DEBUG(0, "%s(), hanging up!\n", __func__ );
tty_port_tty_hangup(&self->port, false);
}
break;
default:
IRDA_DEBUG(2, "%s(), unknown event: %s\n", __func__ ,
ircomm_tty_event[event]);
ret = -EINVAL;
}
return ret;
}