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/* Copyright (C) 2007-2008 The Android Open Source Project
**
** This software is licensed under the terms of the GNU General Public
** License version 2, as published by the Free Software Foundation, and
** may be copied, distributed, and modified under those terms.
**
** 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.
*/
/* implement the modem character device for Android within the QEMU event loop.
* it communicates through a serial port with "rild" (Radio Interface Layer Daemon)
* on the emulated device.
*/
#include "modem_driver.h"
#include "qemu-char.h"
#define xxDEBUG
#ifdef DEBUG
# include <stdio.h>
# define D(...) ( fprintf( stderr, __VA_ARGS__ ) )
#else
# define D(...) ((void)0)
#endif
AModem android_modem;
CharDriverState* android_modem_cs;
typedef struct {
CharDriverState* cs;
AModem modem;
char in_buff[ 1024 ];
int in_pos;
int in_sms;
} ModemDriver;
/* send unsollicited messages to the device */
static void
modem_driver_unsol( void* _md, const char* message)
{
ModemDriver* md = _md;
int len = strlen(message);
qemu_chr_write(md->cs, (const uint8_t*)message, len);
}
static int
modem_driver_can_read( void* _md )
{
ModemDriver* md = _md;
int ret = sizeof(md->in_buff) - md->in_pos;
return ret;
}
/* despite its name, this function is called when the device writes to the modem */
static void
modem_driver_read( void* _md, const uint8_t* src, int len )
{
ModemDriver* md = _md;
const uint8_t* end = src + len;
int nn;
D( "%s: reading %d from %p bytes:", __FUNCTION__, len, src );
for (nn = 0; nn < len; nn++) {
int c = src[nn];
if (c >= 32 && c < 127)
D( "%c", c );
else if (c == '\n')
D( "<LF>" );
else if (c == '\r')
D( "<CR>" );
else
D( "\\x%02x", c );
}
D( "\n" );
for ( ; src < end; src++ ) {
char c = src[0];
if (md->in_sms) {
if (c != 26)
goto AppendChar;
md->in_buff[ md->in_pos ] = c;
md->in_pos++;
md->in_sms = 0;
c = '\n';
}
if (c == '\n' || c == '\r') {
const char* answer;
if (md->in_pos == 0) /* skip empty lines */
continue;
md->in_buff[ md->in_pos ] = 0;
md->in_pos = 0;
D( "%s: << %s\n", __FUNCTION__, md->in_buff );
answer = amodem_send(android_modem, md->in_buff);
if (answer != NULL) {
D( "%s: >> %s\n", __FUNCTION__, answer );
len = strlen(answer);
if (len == 2 && answer[0] == '>' && answer[1] == ' ')
md->in_sms = 1;
qemu_chr_write(md->cs, (const uint8_t*)answer, len);
qemu_chr_write(md->cs, (const uint8_t*)"\r", 1);
} else
D( "%s: -- NO ANSWER\n", __FUNCTION__ );
continue;
}
AppendChar:
md->in_buff[ md->in_pos++ ] = c;
if (md->in_pos == sizeof(md->in_buff)) {
/* input is too long !! */
md->in_pos = 0;
}
}
D( "%s: done\n", __FUNCTION__ );
}
static void
modem_driver_init( int base_port, ModemDriver* dm, CharDriverState* cs )
{
dm->cs = cs;
dm->in_pos = 0;
dm->in_sms = 0;
dm->modem = amodem_create( base_port, modem_driver_unsol, dm );
qemu_chr_add_handlers( cs, modem_driver_can_read, modem_driver_read, NULL, dm );
}
void android_modem_init( int base_port )
{
static ModemDriver modem_driver[1];
if (android_modem_cs != NULL) {
modem_driver_init( base_port, modem_driver, android_modem_cs );
android_modem = modem_driver->modem;
}
}
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