- 根目录:
- net
- irda
- ircomm
- ircomm_tty_attach.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 *** ",
};
static const char *const ircomm_tty_event[] __maybe_unused = {
"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 ****",
};
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_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)) {
pr_debug("%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_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_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
*/
pr_debug("%s(), data-rate = %d\n", __func__ ,
self->settings.data_rate);
if (!self->settings.data_rate)
self->settings.data_rate = 9600;
pr_debug("%s(), data-format = %d\n", __func__ ,
self->settings.data_format);
if (!self->settings.data_format)
self->settings.data_format = IRCOMM_WSIZE_8; /* 8N1 */
pr_debug("%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;
/* 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_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_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) {
pr_debug("%s(), got NULL value!\n", __func__);
return;
}
switch (value->type) {
case IAS_OCT_SEQ:
pr_debug("%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 */
pr_debug("%s(), got lsapsel = %d\n", __func__ ,
value->t.integer);
if (value->t.integer == -1) {
pr_debug("%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:
pr_debug("%s(), got IAS_MISSING\n", __func__);
break;
default:
pr_debug("%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_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_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_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)) {
pr_debug("%s(), waiting for CTS ...\n", __func__);
goto put;
} else {
pr_debug("%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_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;);
pr_debug("%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;);
pr_debug("%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;
pr_debug("%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) {
net_warn_ratelimited("%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:
pr_debug("%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;
pr_debug("%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) {
net_warn_ratelimited("%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:
pr_debug("%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;
pr_debug("%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) {
net_warn_ratelimited("%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:
pr_debug("%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;
pr_debug("%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:
pr_debug("%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;
pr_debug("%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:
pr_debug("%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 {
pr_debug("%s(), hanging up!\n", __func__);
tty_port_tty_hangup(&self->port, false);
}
break;
default:
pr_debug("%s(), unknown event: %s\n", __func__ ,
ircomm_tty_event[event]);
ret = -EINVAL;
}
return ret;
}