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android_kernel_motorola_sm6225/net/irda/ircomm/ircomm_param.c
Arnaldo Carvalho de Melo 27a884dc3c [SK_BUFF]: Convert skb->tail to sk_buff_data_t 
So that it is also an offset from skb->head, reduces its size from 8 to 4 bytes
on 64bit architectures, allowing us to combine the 4 bytes hole left by the
layer headers conversion, reducing struct sk_buff size to 256 bytes, i.e. 4
64byte cachelines, and since the sk_buff slab cache is SLAB_HWCACHE_ALIGN...
:-)

Many calculations that previously required that skb->{transport,network,
mac}_header be first converted to a pointer now can be done directly, being
meaningful as offsets or pointers.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2007-04-25 22:26:28 -07:00

510 lines
14 KiB
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/*********************************************************************
*
* Filename: ircomm_param.c
* Version: 1.0
* Description: Parameter handling for the IrCOMM protocol
* Status: Experimental.
* Author: Dag Brattli <dagb@cs.uit.no>
* Created at: Mon Jun 7 10:25:11 1999
* Modified at: Sun Jan 30 14:32:03 2000
* Modified by: Dag Brattli <dagb@cs.uit.no>
*
* Copyright (c) 1999-2000 Dag Brattli, All Rights Reserved.
*
* 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
********************************************************************/
#include <linux/workqueue.h>
#include <linux/interrupt.h>
#include <net/irda/irda.h>
#include <net/irda/parameters.h>
#include <net/irda/ircomm_core.h>
#include <net/irda/ircomm_tty_attach.h>
#include <net/irda/ircomm_tty.h>
#include <net/irda/ircomm_param.h>
static int ircomm_param_service_type(void *instance, irda_param_t *param,
int get);
static int ircomm_param_port_type(void *instance, irda_param_t *param,
int get);
static int ircomm_param_port_name(void *instance, irda_param_t *param,
int get);
static int ircomm_param_service_type(void *instance, irda_param_t *param,
int get);
static int ircomm_param_data_rate(void *instance, irda_param_t *param,
int get);
static int ircomm_param_data_format(void *instance, irda_param_t *param,
int get);
static int ircomm_param_flow_control(void *instance, irda_param_t *param,
int get);
static int ircomm_param_xon_xoff(void *instance, irda_param_t *param, int get);
static int ircomm_param_enq_ack(void *instance, irda_param_t *param, int get);
static int ircomm_param_line_status(void *instance, irda_param_t *param,
int get);
static int ircomm_param_dte(void *instance, irda_param_t *param, int get);
static int ircomm_param_dce(void *instance, irda_param_t *param, int get);
static int ircomm_param_poll(void *instance, irda_param_t *param, int get);
static pi_minor_info_t pi_minor_call_table_common[] = {
{ ircomm_param_service_type, PV_INT_8_BITS },
{ ircomm_param_port_type, PV_INT_8_BITS },
{ ircomm_param_port_name, PV_STRING }
};
static pi_minor_info_t pi_minor_call_table_non_raw[] = {
{ ircomm_param_data_rate, PV_INT_32_BITS | PV_BIG_ENDIAN },
{ ircomm_param_data_format, PV_INT_8_BITS },
{ ircomm_param_flow_control, PV_INT_8_BITS },
{ ircomm_param_xon_xoff, PV_INT_16_BITS },
{ ircomm_param_enq_ack, PV_INT_16_BITS },
{ ircomm_param_line_status, PV_INT_8_BITS }
};
static pi_minor_info_t pi_minor_call_table_9_wire[] = {
{ ircomm_param_dte, PV_INT_8_BITS },
{ ircomm_param_dce, PV_INT_8_BITS },
{ ircomm_param_poll, PV_NO_VALUE },
};
static pi_major_info_t pi_major_call_table[] = {
{ pi_minor_call_table_common, 3 },
{ pi_minor_call_table_non_raw, 6 },
{ pi_minor_call_table_9_wire, 3 }
/* { pi_minor_call_table_centronics } */
};
pi_param_info_t ircomm_param_info = { pi_major_call_table, 3, 0x0f, 4 };
/*
* Function ircomm_param_request (self, pi, flush)
*
* Queue a parameter for the control channel
*
*/
int ircomm_param_request(struct ircomm_tty_cb *self, __u8 pi, int flush)
{
struct tty_struct *tty;
unsigned long flags;
struct sk_buff *skb;
int count;
IRDA_DEBUG(2, "%s()\n", __FUNCTION__ );
IRDA_ASSERT(self != NULL, return -1;);
IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
tty = self->tty;
if (!tty)
return 0;
/* Make sure we don't send parameters for raw mode */
if (self->service_type == IRCOMM_3_WIRE_RAW)
return 0;
spin_lock_irqsave(&self->spinlock, flags);
skb = self->ctrl_skb;
if (!skb) {
skb = alloc_skb(256, GFP_ATOMIC);
if (!skb) {
spin_unlock_irqrestore(&self->spinlock, flags);
return -ENOMEM;
}
skb_reserve(skb, self->max_header_size);
self->ctrl_skb = skb;
}
/*
* Inserting is a little bit tricky since we don't know how much
* room we will need. But this should hopefully work OK
*/
count = irda_param_insert(self, pi, skb_tail_pointer(skb),
skb_tailroom(skb), &ircomm_param_info);
if (count < 0) {
IRDA_WARNING("%s(), no room for parameter!\n", __FUNCTION__);
spin_unlock_irqrestore(&self->spinlock, flags);
return -1;
}
skb_put(skb, count);
spin_unlock_irqrestore(&self->spinlock, flags);
IRDA_DEBUG(2, "%s(), skb->len=%d\n", __FUNCTION__ , skb->len);
if (flush) {
/* ircomm_tty_do_softint will take care of the rest */
schedule_work(&self->tqueue);
}
return count;
}
/*
* Function ircomm_param_service_type (self, buf, len)
*
* Handle service type, this function will both be called after the LM-IAS
* query and then the remote device sends its initial parameters
*
*/
static int ircomm_param_service_type(void *instance, irda_param_t *param,
int get)
{
struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
__u8 service_type = (__u8) param->pv.i;
IRDA_ASSERT(self != NULL, return -1;);
IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
if (get) {
param->pv.i = self->settings.service_type;
return 0;
}
/* Find all common service types */
service_type &= self->service_type;
if (!service_type) {
IRDA_DEBUG(2,
"%s(), No common service type to use!\n", __FUNCTION__ );
return -1;
}
IRDA_DEBUG(0, "%s(), services in common=%02x\n", __FUNCTION__ ,
service_type);
/*
* Now choose a preferred service type of those available
*/
if (service_type & IRCOMM_CENTRONICS)
self->settings.service_type = IRCOMM_CENTRONICS;
else if (service_type & IRCOMM_9_WIRE)
self->settings.service_type = IRCOMM_9_WIRE;
else if (service_type & IRCOMM_3_WIRE)
self->settings.service_type = IRCOMM_3_WIRE;
else if (service_type & IRCOMM_3_WIRE_RAW)
self->settings.service_type = IRCOMM_3_WIRE_RAW;
IRDA_DEBUG(0, "%s(), resulting service type=0x%02x\n", __FUNCTION__ ,
self->settings.service_type);
/*
* Now the line is ready for some communication. Check if we are a
* server, and send over some initial parameters.
* Client do it in ircomm_tty_state_setup().
* Note : we may get called from ircomm_tty_getvalue_confirm(),
* therefore before we even have open any socket. And self->client
* is initialised to TRUE only later. So, we check if the link is
* really initialised. - Jean II
*/
if ((self->max_header_size != IRCOMM_TTY_HDR_UNINITIALISED) &&
(!self->client) &&
(self->settings.service_type != IRCOMM_3_WIRE_RAW))
{
/* Init connection */
ircomm_tty_send_initial_parameters(self);
ircomm_tty_link_established(self);
}
return 0;
}
/*
* Function ircomm_param_port_type (self, param)
*
* The port type parameter tells if the devices are serial or parallel.
* Since we only advertise serial service, this parameter should only
* be equal to IRCOMM_SERIAL.
*/
static int ircomm_param_port_type(void *instance, irda_param_t *param, int get)
{
struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
IRDA_ASSERT(self != NULL, return -1;);
IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
if (get)
param->pv.i = IRCOMM_SERIAL;
else {
self->settings.port_type = (__u8) param->pv.i;
IRDA_DEBUG(0, "%s(), port type=%d\n", __FUNCTION__ ,
self->settings.port_type);
}
return 0;
}
/*
* Function ircomm_param_port_name (self, param)
*
* Exchange port name
*
*/
static int ircomm_param_port_name(void *instance, irda_param_t *param, int get)
{
struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
IRDA_ASSERT(self != NULL, return -1;);
IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
if (get) {
IRDA_DEBUG(0, "%s(), not imp!\n", __FUNCTION__ );
} else {
IRDA_DEBUG(0, "%s(), port-name=%s\n", __FUNCTION__ , param->pv.c);
strncpy(self->settings.port_name, param->pv.c, 32);
}
return 0;
}
/*
* Function ircomm_param_data_rate (self, param)
*
* Exchange data rate to be used in this settings
*
*/
static int ircomm_param_data_rate(void *instance, irda_param_t *param, int get)
{
struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
IRDA_ASSERT(self != NULL, return -1;);
IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
if (get)
param->pv.i = self->settings.data_rate;
else
self->settings.data_rate = param->pv.i;
IRDA_DEBUG(2, "%s(), data rate = %d\n", __FUNCTION__ , param->pv.i);
return 0;
}
/*
* Function ircomm_param_data_format (self, param)
*
* Exchange data format to be used in this settings
*
*/
static int ircomm_param_data_format(void *instance, irda_param_t *param,
int get)
{
struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
IRDA_ASSERT(self != NULL, return -1;);
IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
if (get)
param->pv.i = self->settings.data_format;
else
self->settings.data_format = (__u8) param->pv.i;
return 0;
}
/*
* Function ircomm_param_flow_control (self, param)
*
* Exchange flow control settings to be used in this settings
*
*/
static int ircomm_param_flow_control(void *instance, irda_param_t *param,
int get)
{
struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
IRDA_ASSERT(self != NULL, return -1;);
IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
if (get)
param->pv.i = self->settings.flow_control;
else
self->settings.flow_control = (__u8) param->pv.i;
IRDA_DEBUG(1, "%s(), flow control = 0x%02x\n", __FUNCTION__ , (__u8) param->pv.i);
return 0;
}
/*
* Function ircomm_param_xon_xoff (self, param)
*
* Exchange XON/XOFF characters
*
*/
static int ircomm_param_xon_xoff(void *instance, irda_param_t *param, int get)
{
struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
IRDA_ASSERT(self != NULL, return -1;);
IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
if (get) {
param->pv.i = self->settings.xonxoff[0];
param->pv.i |= self->settings.xonxoff[1] << 8;
} else {
self->settings.xonxoff[0] = (__u16) param->pv.i & 0xff;
self->settings.xonxoff[1] = (__u16) param->pv.i >> 8;
}
IRDA_DEBUG(0, "%s(), XON/XOFF = 0x%02x,0x%02x\n", __FUNCTION__ ,
param->pv.i & 0xff, param->pv.i >> 8);
return 0;
}
/*
* Function ircomm_param_enq_ack (self, param)
*
* Exchange ENQ/ACK characters
*
*/
static int ircomm_param_enq_ack(void *instance, irda_param_t *param, int get)
{
struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
IRDA_ASSERT(self != NULL, return -1;);
IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
if (get) {
param->pv.i = self->settings.enqack[0];
param->pv.i |= self->settings.enqack[1] << 8;
} else {
self->settings.enqack[0] = (__u16) param->pv.i & 0xff;
self->settings.enqack[1] = (__u16) param->pv.i >> 8;
}
IRDA_DEBUG(0, "%s(), ENQ/ACK = 0x%02x,0x%02x\n", __FUNCTION__ ,
param->pv.i & 0xff, param->pv.i >> 8);
return 0;
}
/*
* Function ircomm_param_line_status (self, param)
*
*
*
*/
static int ircomm_param_line_status(void *instance, irda_param_t *param,
int get)
{
IRDA_DEBUG(2, "%s(), not impl.\n", __FUNCTION__ );
return 0;
}
/*
* Function ircomm_param_dte (instance, param)
*
* If we get here, there must be some sort of null-modem connection, and
* we are probably working in server mode as well.
*/
static int ircomm_param_dte(void *instance, irda_param_t *param, int get)
{
struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
__u8 dte;
IRDA_ASSERT(self != NULL, return -1;);
IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
if (get)
param->pv.i = self->settings.dte;
else {
dte = (__u8) param->pv.i;
self->settings.dce = 0;
if (dte & IRCOMM_DELTA_DTR)
self->settings.dce |= (IRCOMM_DELTA_DSR|
IRCOMM_DELTA_RI |
IRCOMM_DELTA_CD);
if (dte & IRCOMM_DTR)
self->settings.dce |= (IRCOMM_DSR|
IRCOMM_RI |
IRCOMM_CD);
if (dte & IRCOMM_DELTA_RTS)
self->settings.dce |= IRCOMM_DELTA_CTS;
if (dte & IRCOMM_RTS)
self->settings.dce |= IRCOMM_CTS;
/* Take appropriate actions */
ircomm_tty_check_modem_status(self);
/* Null modem cable emulator */
self->settings.null_modem = TRUE;
}
return 0;
}
/*
* Function ircomm_param_dce (instance, param)
*
*
*
*/
static int ircomm_param_dce(void *instance, irda_param_t *param, int get)
{
struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
__u8 dce;
IRDA_DEBUG(1, "%s(), dce = 0x%02x\n", __FUNCTION__ , (__u8) param->pv.i);
dce = (__u8) param->pv.i;
IRDA_ASSERT(self != NULL, return -1;);
IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
self->settings.dce = dce;
/* Check if any of the settings have changed */
if (dce & 0x0f) {
if (dce & IRCOMM_DELTA_CTS) {
IRDA_DEBUG(2, "%s(), CTS \n", __FUNCTION__ );
}
}
ircomm_tty_check_modem_status(self);
return 0;
}
/*
* Function ircomm_param_poll (instance, param)
*
* Called when the peer device is polling for the line settings
*
*/
static int ircomm_param_poll(void *instance, irda_param_t *param, int get)
{
struct ircomm_tty_cb *self = (struct ircomm_tty_cb *) instance;
IRDA_ASSERT(self != NULL, return -1;);
IRDA_ASSERT(self->magic == IRCOMM_TTY_MAGIC, return -1;);
/* Poll parameters are always of lenght 0 (just a signal) */
if (!get) {
/* Respond with DTE line settings */
ircomm_param_request(self, IRCOMM_DTE, TRUE);
}
return 0;
}
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