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/*
* BRLTTY - A background process providing access to the console screen (when in
* text mode) for a blind person using a refreshable braille display.
*
* Copyright (C) 1995-2012 by The BRLTTY Developers.
*
* BRLTTY comes with ABSOLUTELY NO WARRANTY.
*
* This is free software, placed 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. Please see the file LICENSE-GPL for details.
*
* Web Page: http://mielke.cc/brltty/
*
* This software is maintained by Dave Mielke <dave@mielke.cc>.
*/
/* FreedomScientific/braille.c - Braille display library
* Freedom Scientific's Focus and PacMate series
* Author: Dave Mielke <dave@mielke.cc>
*/
#include "prologue.h"
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include "log.h"
#include "parse.h"
#include "timing.h"
#define BRLSTAT ST_AlvaStyle
#define BRL_HAVE_PACKET_IO
#include "brl_driver.h"
#include "brldefs-fs.h"
BEGIN_KEY_NAME_TABLE(common)
KEY_NAME_ENTRY(FS_KEY_LeftAdvance, "LeftAdvance"),
KEY_NAME_ENTRY(FS_KEY_RightAdvance, "RightAdvance"),
KEY_NAME_ENTRY(FS_KEY_LeftGdf, "LeftGdf"),
KEY_NAME_ENTRY(FS_KEY_RightGdf, "RightGdf"),
KEY_NAME_ENTRY(FS_KEY_LeftWheel, "LeftWheelPress"),
KEY_NAME_ENTRY(FS_KEY_RightWheel, "RightWheelPress"),
KEY_NAME_ENTRY(FS_KEY_WHEEL+0, "LeftWheelUp"),
KEY_NAME_ENTRY(FS_KEY_WHEEL+1, "LeftWheelDown"),
KEY_NAME_ENTRY(FS_KEY_WHEEL+2, "RightWheelDown"),
KEY_NAME_ENTRY(FS_KEY_WHEEL+3, "RightWheelUp"),
KEY_SET_ENTRY(FS_SET_RoutingKeys, "RoutingKey"),
KEY_SET_ENTRY(FS_SET_NavrowKeys, "NavrowKey"),
END_KEY_NAME_TABLE
BEGIN_KEY_NAME_TABLE(focus)
KEY_NAME_ENTRY(FS_KEY_Dot1, "Dot1"),
KEY_NAME_ENTRY(FS_KEY_Dot2, "Dot2"),
KEY_NAME_ENTRY(FS_KEY_Dot3, "Dot3"),
KEY_NAME_ENTRY(FS_KEY_Dot4, "Dot4"),
KEY_NAME_ENTRY(FS_KEY_Dot5, "Dot5"),
KEY_NAME_ENTRY(FS_KEY_Dot6, "Dot6"),
KEY_NAME_ENTRY(FS_KEY_Dot7, "Dot7"),
KEY_NAME_ENTRY(FS_KEY_Dot8, "Dot8"),
KEY_NAME_ENTRY(FS_KEY_Space, "Space"),
KEY_NAME_ENTRY(FS_KEY_LeftShift, "LeftShift"),
KEY_NAME_ENTRY(FS_KEY_RightShift, "RightShift"),
END_KEY_NAME_TABLE
BEGIN_KEY_NAME_TABLE(bumpers)
KEY_NAME_ENTRY(FS_KEY_LeftBumperUp, "LeftBumperUp"),
KEY_NAME_ENTRY(FS_KEY_LeftBumperDown, "LeftBumperDown"),
KEY_NAME_ENTRY(FS_KEY_RightBumperUp, "RightBumperUp"),
KEY_NAME_ENTRY(FS_KEY_RightBumperDown, "RightBumperDown"),
END_KEY_NAME_TABLE
BEGIN_KEY_NAME_TABLE(rockers)
KEY_NAME_ENTRY(FS_KEY_LeftRockerUp, "LeftRockerUp"),
KEY_NAME_ENTRY(FS_KEY_LeftRockerDown, "LeftRockerDown"),
KEY_NAME_ENTRY(FS_KEY_RightRockerUp, "RightRockerUp"),
KEY_NAME_ENTRY(FS_KEY_RightRockerDown, "RightRockerDown"),
END_KEY_NAME_TABLE
BEGIN_KEY_NAME_TABLE(pacmate)
KEY_NAME_ENTRY(FS_KEY_HOT+0, "Hot1"),
KEY_NAME_ENTRY(FS_KEY_HOT+1, "Hot2"),
KEY_NAME_ENTRY(FS_KEY_HOT+2, "Hot3"),
KEY_NAME_ENTRY(FS_KEY_HOT+3, "Hot4"),
KEY_NAME_ENTRY(FS_KEY_HOT+4, "Hot5"),
KEY_NAME_ENTRY(FS_KEY_HOT+5, "Hot6"),
KEY_NAME_ENTRY(FS_KEY_HOT+6, "Hot7"),
KEY_NAME_ENTRY(FS_KEY_HOT+7, "Hot8"),
END_KEY_NAME_TABLE
BEGIN_KEY_NAME_TABLES(focus_basic)
KEY_NAME_TABLE(common),
KEY_NAME_TABLE(focus),
END_KEY_NAME_TABLES
BEGIN_KEY_NAME_TABLES(focus_large)
KEY_NAME_TABLE(common),
KEY_NAME_TABLE(focus),
KEY_NAME_TABLE(bumpers),
END_KEY_NAME_TABLES
BEGIN_KEY_NAME_TABLES(focus_small)
KEY_NAME_TABLE(common),
KEY_NAME_TABLE(focus),
KEY_NAME_TABLE(rockers),
END_KEY_NAME_TABLES
BEGIN_KEY_NAME_TABLES(pacmate)
KEY_NAME_TABLE(common),
KEY_NAME_TABLE(pacmate),
END_KEY_NAME_TABLES
DEFINE_KEY_TABLE(focus_basic)
DEFINE_KEY_TABLE(focus_large)
DEFINE_KEY_TABLE(focus_small)
DEFINE_KEY_TABLE(pacmate)
BEGIN_KEY_TABLE_LIST
&KEY_TABLE_DEFINITION(focus_basic),
&KEY_TABLE_DEFINITION(focus_large),
&KEY_TABLE_DEFINITION(focus_small),
&KEY_TABLE_DEFINITION(pacmate),
END_KEY_TABLE_LIST
typedef struct {
int (*openPort) (char **parameters, const char *device);
void (*closePort) (void);
int (*awaitInput) (int milliseconds);
int (*readBytes) (void *buffer, int length);
int (*writePacket) (const void *buffer, int length);
} InputOutputOperations;
static const InputOutputOperations *io;
static int outputPayloadLimit;
static const int serialBaud = 57600;
static int serialCharactersPerSecond;
#include "io_serial.h"
static SerialDevice *serialDevice = NULL;
static int
openSerialPort (char **parameters, const char *device) {
if ((serialDevice = serialOpenDevice(device))) {
if (serialRestartDevice(serialDevice, serialBaud)) return 1;
serialCloseDevice(serialDevice);
serialDevice = NULL;
}
return 0;
}
static void
closeSerialPort (void) {
if (serialDevice) {
serialCloseDevice(serialDevice);
serialDevice = NULL;
}
}
static int
awaitSerialInput (int milliseconds) {
return serialAwaitInput(serialDevice, milliseconds);
}
static int
readSerialBytes (void *buffer, int length) {
return serialReadData(serialDevice, buffer, length, 0, 0);
}
static int
writeSerialPacket (const void *buffer, int length) {
return serialWriteData(serialDevice, buffer, length);
}
static const InputOutputOperations serialOperations = {
openSerialPort, closeSerialPort,
awaitSerialInput, readSerialBytes, writeSerialPacket
};
#include "io_usb.h"
static UsbChannel *usbChannel = NULL;
static int
openUsbPort (char **parameters, const char *device) {
static const UsbChannelDefinition definitions[] = {
{ /* Focus 1 */
.vendor=0X0F4E, .product=0X0100,
.configuration=1, .interface=0, .alternative=0,
.inputEndpoint=2, .outputEndpoint=1
}
,
{ /* PAC Mate */
.vendor=0X0F4E, .product=0X0111,
.configuration=1, .interface=0, .alternative=0,
.inputEndpoint=2, .outputEndpoint=1
}
,
{ /* Focus 2 */
.vendor=0X0F4E, .product=0X0112,
.configuration=1, .interface=0, .alternative=0,
.inputEndpoint=2, .outputEndpoint=1
}
,
{ /* Focus Blue */
.vendor=0X0F4E, .product=0X0114,
.configuration=1, .interface=0, .alternative=0,
.inputEndpoint=2, .outputEndpoint=1
}
,
{ .vendor=0 }
};
if ((usbChannel = usbFindChannel(definitions, (void *)device))) {
return 1;
}
return 0;
}
static void
closeUsbPort (void) {
if (usbChannel) {
usbCloseChannel(usbChannel);
usbChannel = NULL;
}
}
static int
awaitUsbInput (int milliseconds) {
return usbAwaitInput(usbChannel->device, usbChannel->definition.inputEndpoint, milliseconds);
}
static int
readUsbBytes (void *buffer, int length) {
int count = usbReapInput(usbChannel->device, usbChannel->definition.inputEndpoint, buffer, length, 0, 0);
if (count == -1)
if (errno == EAGAIN)
count = 0;
return count;
}
static int
writeUsbPacket (const void *buffer, int length) {
return usbWriteEndpoint(usbChannel->device, usbChannel->definition.outputEndpoint, buffer, length, 1000);
}
static const InputOutputOperations usbOperations = {
openUsbPort, closeUsbPort,
awaitUsbInput, readUsbBytes, writeUsbPacket
};
#include "io_bluetooth.h"
static BluetoothConnection *bluetoothConnection = NULL;
static int
openBluetoothPort (char **parameters, const char *device) {
return (bluetoothConnection = bthOpenConnection(device, 1, 0)) != NULL;
}
static void
closeBluetoothPort (void) {
if (bluetoothConnection) {
bthCloseConnection(bluetoothConnection);
bluetoothConnection = NULL;
}
}
static int
awaitBluetoothInput (int milliseconds) {
return bthAwaitInput(bluetoothConnection, milliseconds);
}
static int
readBluetoothBytes (void *buffer, int length) {
return bthReadData(bluetoothConnection, buffer, length, 0, 0);
}
static int
writeBluetoothPacket (const void *buffer, int length) {
return bthWriteData(bluetoothConnection, buffer, length);
}
static const InputOutputOperations bluetoothOperations = {
openBluetoothPort, closeBluetoothPort,
awaitBluetoothInput, readBluetoothBytes, writeBluetoothPacket
};
typedef enum {
PKT_QUERY = 0X00, /* host->unit: request device information */
PKT_ACK = 0X01, /* unit->host: acknowledge packet receipt */
PKT_NAK = 0X02, /* unit->host: negative acknowledge, report error */
PKT_KEY = 0X03, /* unit->host: key event */
PKT_BUTTON = 0X04, /* unit->host: routing button event */
PKT_WHEEL = 0X05, /* unit->host: whiz wheel event */
PKT_HVADJ = 0X08, /* host->unit: set braille display voltage */
PKT_BEEP = 0X09, /* host->unit: sound short beep */
PKT_CONFIG = 0X0F, /* host->unit: configure device options */
PKT_INFO = 0X80, /* unit->host: response to query packet */
PKT_WRITE = 0X81, /* host->unit: write to braille display */
PKT_EXTKEY = 0X82 /* unit->host: extended keys event */
} PacketType;
typedef enum {
PKT_ERR_TIMEOUT = 0X30, /* no data received from host for a while */
PKT_ERR_CHECKSUM = 0X31, /* incorrect checksum */
PKT_ERR_TYPE = 0X32, /* unsupported packet type */
PKT_ERR_PARAMETER = 0X33, /* invalid parameter */
PKT_ERR_SIZE = 0X34, /* write size too large */
PKT_ERR_POSITION = 0X35, /* write position too large */
PKT_ERR_OVERRUN = 0X36, /* message queue overflow */
PKT_ERR_POWER = 0X37, /* insufficient USB power */
PKT_ERR_SPI = 0X38 /* timeout on SPI bus */
} PacketError;
typedef enum {
PKT_EXT_HVADJ = 0X08, /* error in varibraille packet */
PKT_EXT_BEEP = 0X09, /* error in beep packet */
PKT_EXT_CLEAR = 0X31, /* error in ClearMsgBuf function */
PKT_EXT_LOOP = 0X32, /* timing loop in ParseCommands function */
PKT_EXT_TYPE = 0X33, /* unknown packet type in ParseCommands function */
PKT_EXT_CMDWRITE = 0X34, /* error in CmdWrite function */
PKT_EXT_UPDATE = 0X7E, /* error in update packet */
PKT_EXT_DIAG = 0X7F, /* error in diag packet */
PKT_EXT_QUERY = 0X80, /* error in query packet */
PKT_EXT_WRITE = 0X81 /* error in write packet */
} PacketExtended;
typedef enum {
OPT_EXTKEY = 0X01 /* send extended key events */
} UnitOption;
typedef struct {
unsigned char type;
unsigned char arg1;
unsigned char arg2;
unsigned char arg3;
} PacketHeader;
typedef struct {
PacketHeader header;
union {
unsigned char bytes[0X100];
struct {
char manufacturer[24];
char model[16];
char firmware[8];
} info;
struct {
unsigned char bytes[4];
} extkey;
} payload;
} Packet;
typedef struct {
const KeyTableDefinition *keyTableDefinition;
signed char hotkeysRow;
} ModelTypeEntry;
typedef enum {
MOD_TYPE_Focus,
MOD_TYPE_Pacmate
} ModelType;
static const ModelTypeEntry modelTypeTable[] = {
[MOD_TYPE_Focus] = {
.keyTableDefinition = &KEY_TABLE_DEFINITION(focus_basic),
.hotkeysRow = -1
}
,
[MOD_TYPE_Pacmate] = {
.keyTableDefinition = &KEY_TABLE_DEFINITION(pacmate),
.hotkeysRow = 1
}
};
typedef struct {
const char *identifier;
const DotsTable *dotsTable;
unsigned char cellCount;
unsigned char type;
} ModelEntry;
static const DotsTable dotsTable_Focus1 = {0X01, 0X02, 0X04, 0X10, 0X20, 0X40, 0X08, 0X80};
static const ModelEntry modelTable[] = {
{ .identifier = "Focus 14",
.dotsTable = &dotsTable_ISO11548_1,
.cellCount = 14,
.type = MOD_TYPE_Focus
}
,
{ .identifier = "Focus 40",
.dotsTable = &dotsTable_ISO11548_1,
.cellCount = 40,
.type = MOD_TYPE_Focus
}
,
{ .identifier = "Focus 44",
.dotsTable = &dotsTable_Focus1,
.cellCount = 44,
.type = MOD_TYPE_Focus
}
,
{ .identifier = "Focus 70",
.dotsTable = &dotsTable_Focus1,
.cellCount = 70,
.type = MOD_TYPE_Focus
}
,
{ .identifier = "Focus 80",
.dotsTable = &dotsTable_ISO11548_1,
.cellCount = 80,
.type = MOD_TYPE_Focus
}
,
{ .identifier = "Focus 84",
.dotsTable = &dotsTable_Focus1,
.cellCount = 84,
.type = MOD_TYPE_Focus
}
,
{ .identifier = "pm display 20",
.dotsTable = &dotsTable_ISO11548_1,
.cellCount = 20,
.type = MOD_TYPE_Pacmate
}
,
{ .identifier = "pm display 40",
.dotsTable = &dotsTable_ISO11548_1,
.cellCount = 40,
.type = MOD_TYPE_Pacmate
}
,
{ .identifier = NULL }
};
static const ModelEntry *model;
static const KeyTableDefinition *keyTableDefinition;
static unsigned char outputBuffer[84];
static int writeFirst;
static int writeLast;
static int writingFirst;
static int writingLast;
typedef void (*AcknowledgementHandler) (int ok);
static AcknowledgementHandler acknowledgementHandler;
static TimeValue acknowledgementTime;
static int acknowledgementsMissing;
static unsigned char configFlags;
static int firmnessSetting;
static union {
Packet packet;
unsigned char bytes[sizeof(Packet)];
} inputBuffer;
static int inputCount;
static uint64_t oldKeys;
static int
writePacket (
BrailleDisplay *brl,
unsigned char type,
unsigned char arg1,
unsigned char arg2,
unsigned char arg3,
const unsigned char *data
) {
Packet packet;
int size = sizeof(packet.header);
unsigned char checksum = 0;
checksum -= (packet.header.type = type);
checksum -= (packet.header.arg1 = arg1);
checksum -= (packet.header.arg2 = arg2);
checksum -= (packet.header.arg3 = arg3);
if (data) {
unsigned char length = packet.header.arg1;
int index;
for (index=0; index<length; index+=1)
checksum -= (packet.payload.bytes[index] = data[index]);
packet.payload.bytes[length] = checksum;
size += length + 1;
}
logOutputPacket(&packet, size);
{
int result = io->writePacket(&packet, size);
if (result != -1) brl->writeDelay += (size * 1000 / serialCharactersPerSecond) + 1;
return result;
}
}
static void
logNegativeAcknowledgement (const Packet *packet) {
const char *problem;
const char *component;
switch (packet->header.arg1) {
default:
problem = "unknown problem";
break;
case PKT_ERR_TIMEOUT:
problem = "timeout during packet transmission";
break;
case PKT_ERR_CHECKSUM:
problem = "incorrect checksum";
break;
case PKT_ERR_TYPE:
problem = "unknown packet type";
break;
case PKT_ERR_PARAMETER:
problem = "invalid parameter value";
break;
case PKT_ERR_SIZE:
problem = "write size too large";
break;
case PKT_ERR_POSITION:
problem = "write start too large";
break;
case PKT_ERR_OVERRUN:
problem = "message FIFO overflow";
break;
case PKT_ERR_POWER:
problem = "insufficient USB power";
break;
case PKT_ERR_SPI:
problem = "SPI bus timeout";
break;
}
switch (packet->header.arg2) {
default:
component = "unknown component";
break;
case PKT_EXT_HVADJ:
component = "VariBraille packet";
break;
case PKT_EXT_BEEP:
component = "beep packet";
break;
case PKT_EXT_CLEAR:
component = "ClearMsgBuf function";
break;
case PKT_EXT_LOOP:
component = "timing loop of ParseCommands function";
break;
case PKT_EXT_TYPE:
component = "ParseCommands function";
break;
case PKT_EXT_CMDWRITE:
component = "CmdWrite function";
break;
case PKT_EXT_UPDATE:
component = "update packet";
break;
case PKT_EXT_DIAG:
component = "diag packet";
break;
case PKT_EXT_QUERY:
component = "query packet";
break;
case PKT_EXT_WRITE:
component = "write packet";
break;
}
logMessage(LOG_WARNING, "Negative Acknowledgement: [%02X] %s in [%02X] %s",
packet->header.arg1, problem,
packet->header.arg2, component);
}
static void
handleConfigAcknowledgement (int ok) {
configFlags = 0;
}
static void
handleFirmnessAcknowledgement (int ok) {
firmnessSetting = -1;
}
static void
handleWriteAcknowledgement (int ok) {
if (!ok) {
if ((writeFirst == -1) || (writingFirst < writeFirst)) writeFirst = writingFirst;
if ((writeLast == -1) || (writingLast > writeLast)) writeLast = writingLast;
}
}
static void
setAcknowledgementHandler (AcknowledgementHandler handler) {
acknowledgementHandler = handler;
getCurrentTime(&acknowledgementTime);
}
static int
writeRequest (BrailleDisplay *brl) {
if (acknowledgementHandler) return 1;
if (configFlags) {
if (writePacket(brl, PKT_CONFIG, configFlags, 0, 0, NULL) == -1) return 0;
setAcknowledgementHandler(handleConfigAcknowledgement);
return 1;
}
if (firmnessSetting >= 0) {
if (writePacket(brl, PKT_HVADJ, firmnessSetting, 0, 0, NULL) == -1) return 0;
setAcknowledgementHandler(handleFirmnessAcknowledgement);
return 1;
}
if (writeLast != -1) {
unsigned int count = writeLast + 1 - writeFirst;
unsigned char buffer[count];
int truncate = count > outputPayloadLimit;
if (truncate) count = outputPayloadLimit;
translateOutputCells(buffer, &outputBuffer[writeFirst], count);
if (writePacket(brl, PKT_WRITE, count, writeFirst, 0, buffer) == -1) return 0;
setAcknowledgementHandler(handleWriteAcknowledgement);
writingFirst = writeFirst;
if (truncate) {
writingLast = (writeFirst += count) - 1;
} else {
writingLast = writeLast;
writeFirst = -1;
writeLast = -1;
}
return 1;
}
return 1;
}
static void
updateCells (
BrailleDisplay *brl,
const unsigned char *cells,
unsigned char count,
unsigned char offset
) {
unsigned int from;
unsigned int to;
if (cellsHaveChanged(&outputBuffer[offset], cells, count, &from, &to, NULL)) {
int first = from + offset;
int last = to + offset - 1;
if ((writeFirst == -1) || (first < writeFirst)) writeFirst = first;
if (last > writeLast) writeLast = last;
}
}
static int
readPacket (BrailleDisplay *brl, Packet *packet) {
while (1) {
int size = sizeof(PacketHeader);
int hasPayload = 0;
if (inputCount >= sizeof(PacketHeader)) {
if (inputBuffer.packet.header.type & 0X80) {
hasPayload = 1;
size += inputBuffer.packet.header.arg1 + 1;
}
}
if (size <= inputCount) {
logInputPacket(inputBuffer.bytes, size);
if (hasPayload) {
unsigned char checksum = 0;
int index;
for (index=0; index<size; index+=1) checksum -= inputBuffer.bytes[index];
if (checksum) logMessage(LOG_WARNING, "Input packet checksum error.");
}
memcpy(packet, &inputBuffer, size);
memmove(&inputBuffer.bytes[0], &inputBuffer.bytes[size],
inputCount -= size);
return size;
}
retry:
{
int count = io->readBytes(&inputBuffer.bytes[inputCount], size-inputCount);
if (count < 1) {
if (count == -1) {
logSystemError("read");
} else if ((count == 0) && (inputCount > 0)) {
if (io->awaitInput(1000)) goto retry;
if (errno != EAGAIN) count = -1;
logPartialPacket(inputBuffer.bytes, inputCount);
inputCount = 0;
}
return count;
}
acknowledgementsMissing = 0;
if (!inputCount) {
static const unsigned char packets[] = {
PKT_ACK, PKT_NAK,
PKT_KEY, PKT_EXTKEY, PKT_BUTTON, PKT_WHEEL,
PKT_INFO
};
int first;
for (first=0; first<count; first+=1)
if (memchr(packets, inputBuffer.bytes[first], sizeof(packets)))
break;
if (first) {
logDiscardedBytes(inputBuffer.bytes, first);
memmove(&inputBuffer.bytes[0], &inputBuffer.bytes[first], count-=first);
}
}
inputCount += count;
}
}
}
static int
getPacket (BrailleDisplay *brl, Packet *packet) {
while (1) {
int count = readPacket(brl, packet);
if (count > 0) {
switch (packet->header.type) {
{
int ok;
case PKT_NAK:
logNegativeAcknowledgement(packet);
if (!acknowledgementHandler) {
logMessage(LOG_WARNING, "Unexpected NAK.");
continue;
}
switch (packet->header.arg1) {
case PKT_ERR_TIMEOUT: {
int originalLimit = outputPayloadLimit;
if (outputPayloadLimit > model->cellCount)
outputPayloadLimit = model->cellCount;
if (outputPayloadLimit > 1)
outputPayloadLimit--;
if (outputPayloadLimit != originalLimit)
logMessage(LOG_WARNING, "Maximum payload length reduced from %d to %d.",
originalLimit, outputPayloadLimit);
break;
}
}
handleNegativeAcknowledgement:
ok = 0;
goto handleAcknowledgement;
case PKT_ACK:
if (!acknowledgementHandler) {
logMessage(LOG_WARNING, "Unexpected ACK.");
continue;
}
ok = 1;
handleAcknowledgement:
acknowledgementHandler(ok);
acknowledgementHandler = NULL;
if (writeRequest(brl)) continue;
count = -1;
break;
}
}
} else if ((count == 0) && acknowledgementHandler &&
(millisecondsSince(&acknowledgementTime) > 500)) {
if (++acknowledgementsMissing < 5) {
logMessage(LOG_WARNING, "Missing ACK; assuming NAK.");
goto handleNegativeAcknowledgement;
}
logMessage(LOG_WARNING, "Too many missing ACKs.");
count = -1;
}
return count;
}
}
static int
setFirmness (BrailleDisplay *brl, BrailleFirmness setting) {
firmnessSetting = setting * 0XFF / BRL_FIRMNESS_MAXIMUM;
return writeRequest(brl);
}
static int
brl_construct (BrailleDisplay *brl, char **parameters, const char *device) {
if (isSerialDevice(&device)) {
io = &serialOperations;
} else if (isUsbDevice(&device)) {
io = &usbOperations;
} else if (isBluetoothDevice(&device)) {
io = &bluetoothOperations;
} else {
unsupportedDevice(device);
return 0;
}
inputCount = 0;
outputPayloadLimit = 0XFF;
serialCharactersPerSecond = serialBaud / 10;
if (io->openPort(parameters, device)) {
int tries = 0;
while (io->awaitInput(10)) {
Packet packet;
int count = readPacket(brl, &packet);
if (count == -1) goto failure;
}
if (errno != EAGAIN) goto failure;
while (writePacket(brl, PKT_QUERY, 0, 0, 0, NULL) > 0) {
int acknowledged = 0;
model = NULL;
while (io->awaitInput(100)) {
Packet response;
int count = readPacket(brl, &response);
if (count == -1) goto failure;
switch (response.header.type) {
case PKT_INFO:
logMessage(LOG_DEBUG, "Manufacturer: %s", response.payload.info.manufacturer);
logMessage(LOG_DEBUG, "Model: %s", response.payload.info.model);
logMessage(LOG_DEBUG, "Firmware: %s", response.payload.info.firmware);
model = modelTable;
while (model->identifier) {
if (strcmp(response.payload.info.model, model->identifier) == 0) break;
model += 1;
}
if (!model->identifier) {
static ModelEntry generic;
model = &generic;
logMessage(LOG_WARNING, "Detected unknown model: %s", response.payload.info.model);
memset(&generic, 0, sizeof(generic));
generic.identifier = "Generic";
generic.cellCount = 20;
generic.dotsTable = &dotsTable_ISO11548_1;
generic.type = MOD_TYPE_Pacmate;
{
typedef struct {
const char *identifier;
const DotsTable *dotsTable;
} ExceptionEntry;
static const ExceptionEntry exceptionTable[] = {
{"Focus", &dotsTable_Focus1},
{NULL , NULL }
};
const ExceptionEntry *exception = exceptionTable;
while (exception->identifier) {
if (strncmp(response.payload.info.model, exception->identifier, strlen(exception->identifier)) == 0) {
generic.dotsTable = exception->dotsTable;
break;
}
exception++;
}
}
{
const char *word = strrchr(response.payload.info.model, ' ');
if (word) {
int size;
if (isInteger(&size, ++word)) {
static char identifier[sizeof(response.payload.info.model)];
generic.cellCount = size;
snprintf(identifier, sizeof(identifier), "%s %d",
generic.identifier, generic.cellCount);
generic.identifier = identifier;
}
}
}
}
if (model) {
keyTableDefinition = modelTypeTable[model->type].keyTableDefinition;
makeOutputTable(model->dotsTable[0]);
memset(outputBuffer, 0, model->cellCount);
writeFirst = 0;
writeLast = model->cellCount - 1;
acknowledgementHandler = NULL;
acknowledgementsMissing = 0;
configFlags = 0;
firmnessSetting = -1;
if (model->type == MOD_TYPE_Focus) {
unsigned char firmwareVersion = response.payload.info.firmware[0] - '0';
if (firmwareVersion >= 3) {
configFlags |= 0X02;
if (model->cellCount < 80) {
keyTableDefinition = &KEY_TABLE_DEFINITION(focus_small);
} else {
keyTableDefinition = &KEY_TABLE_DEFINITION(focus_large);
}
}
}
oldKeys = 0;
logMessage(LOG_INFO, "Detected %s: cells=%d, firmware=%s",
model->identifier,
model->cellCount,
response.payload.info.firmware);
}
break;
case PKT_ACK:
acknowledged = 1;
break;
case PKT_NAK:
logNegativeAcknowledgement(&response);
default:
acknowledged = 0;
model = NULL;
break;
}
if (acknowledged && model) {
brl->textColumns = model->cellCount;
brl->textRows = 1;
brl->keyBindings = keyTableDefinition->bindings;
brl->keyNameTables = keyTableDefinition->names;
brl->setFirmness = setFirmness;
if (!writeRequest(brl)) break;
return 1;
}
}
if (errno != EAGAIN) break;
if (++tries == 3) break;
}
failure:
io->closePort();
}
return 0;
}
static void
brl_destruct (BrailleDisplay *brl) {
io->closePort();
}
static int
brl_writeWindow (BrailleDisplay *brl, const wchar_t *text) {
updateCells(brl, brl->buffer, model->cellCount, 0);
return writeRequest(brl);
}
static void
updateKeys (uint64_t newKeys, unsigned char keyBase, unsigned char keyCount) {
const FS_KeySet set = FS_SET_NavigationKeys;
FS_NavigationKey key = keyBase;
FS_NavigationKey pressKeys[keyCount];
unsigned int pressCount = 0;
uint64_t keyBit = 0X1 << keyBase;
newKeys <<= keyBase;
newKeys |= oldKeys & ~(((0X1 << keyCount) - 1) << keyBase);
while (oldKeys != newKeys) {
uint64_t oldKey = oldKeys & keyBit;
uint64_t newKey = newKeys & keyBit;
if (oldKey && !newKey) {
enqueueKeyEvent(set, key, 0);
oldKeys &= ~keyBit;
} else if (newKey && !oldKey) {
pressKeys[pressCount++] = key;
oldKeys |= keyBit;
}
keyBit <<= 1;
key += 1;
}
while (pressCount) enqueueKeyEvent(set, pressKeys[--pressCount], 1);
}
static int
brl_readCommand (BrailleDisplay *brl, KeyTableCommandContext context) {
Packet packet;
int count;
while ((count = getPacket(brl, &packet))) {
if (count == -1) return BRL_CMD_RESTARTBRL;
switch (packet.header.type) {
default:
break;
case PKT_KEY: {
uint64_t newKeys = packet.header.arg1 |
(packet.header.arg2 << 8) |
(packet.header.arg3 << 16);
updateKeys(newKeys, 0, 24);
continue;
}
case PKT_EXTKEY: {
uint64_t newKeys = packet.payload.extkey.bytes[0];
updateKeys(newKeys, 24, 8);
continue;
}
case PKT_BUTTON: {
unsigned char key = packet.header.arg1;
unsigned char press = (packet.header.arg2 & 0X01) != 0;
unsigned char set = packet.header.arg3;
if (set == modelTypeTable[model->type].hotkeysRow) {
static const unsigned char keys[] = {
FS_KEY_LeftGdf,
FS_KEY_HOT+0, FS_KEY_HOT+1, FS_KEY_HOT+2, FS_KEY_HOT+3,
FS_KEY_HOT+4, FS_KEY_HOT+5, FS_KEY_HOT+6, FS_KEY_HOT+7,
FS_KEY_RightGdf
};
static const unsigned char keyCount = ARRAY_COUNT(keys);
const unsigned char base = (model->cellCount - keyCount) / 2;
if (key < base) {
key = FS_KEY_LeftAdvance;
} else if ((key -= base) >= keyCount) {
key = FS_KEY_RightAdvance;
} else {
key = keys[key];
}
set = FS_SET_NavigationKeys;
} else {
set += 1;
}
enqueueKeyEvent(set, key, press);
continue;
}
case PKT_WHEEL: {
const FS_KeySet set = FS_SET_NavigationKeys;
const FS_NavigationKey key = FS_KEY_WHEEL + ((packet.header.arg1 >> 3) & 0X7);
unsigned int count = packet.header.arg1 & 0X7;
while (count) {
enqueueKeyEvent(set, key, 1);
enqueueKeyEvent(set, key, 0);
count -= 1;
}
continue;
}
}
logMessage(LOG_WARNING, "unsupported packet: %02X %02X %02X %02X",
packet.header.type,
packet.header.arg1,
packet.header.arg2,
packet.header.arg3);
}
return EOF;
}
static ssize_t
brl_readPacket (BrailleDisplay *brl, void *buffer, size_t length) {
Packet packet;
int count = readPacket(brl, &packet);
if (count > 0) {
if (count > sizeof(packet.header)) count--;
if (length < count) {
logMessage(LOG_WARNING, "Input packet buffer too small: %d < %d", (int)length, count);
count = length;
}
memcpy(buffer, &packet, count);
}
return count;
}
static ssize_t
brl_writePacket (BrailleDisplay *brl, const void *packet, size_t length) {
const unsigned char *bytes = packet;
int size = 4;
if (length >= size) {
int hasPayload = 0;
if (bytes[0] & 0X80) {
size += bytes[1];
hasPayload = 1;
}
if (length >= size) {
if (length > size)
logMessage(LOG_WARNING, "Output packet buffer larger than necessary: %d > %d",
(int)length, size);
return writePacket(brl, bytes[0], bytes[1], bytes[2], bytes[3],
(hasPayload? &bytes[4]: NULL));
}
}
logMessage(LOG_WARNING, "Output packet buffer too small: %d < %d", (int)length, size);
return 0;
}
static int
brl_reset (BrailleDisplay *brl) {
return 0;
}
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