nut-debian/drivers/bcmxcp_ser.c

341 lines
7.4 KiB
C
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#include "main.h"
#include "bcmxcp.h"
#include "bcmxcp_io.h"
#include "serial.h"
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#define SUBDRIVER_NAME "RS-232 communication subdriver"
#define SUBDRIVER_VERSION "0.20"
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/* communication driver description structure */
upsdrv_info_t comm_upsdrv_info = {
SUBDRIVER_NAME,
SUBDRIVER_VERSION,
NULL,
0,
{ NULL }
};
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#define PW_MAX_BAUD 5
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struct pw_baud_rate {
int rate;
int name;
} pw_baud_rates[] = {
{ B19200, 19200 },
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{ B9600, 9600 },
{ B4800, 4800 },
{ B2400, 2400 },
{ B1200, 1200 },
/* end of structure. */
{ 0, 0 }
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};
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unsigned char AUT[4] = {0xCF, 0x69, 0xE8, 0xD5}; /* Autorisation command */
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static void send_command(unsigned char *command, int command_length)
{
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int retry = 0, sent;
unsigned char sbuf[128];
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/* Prepare the send buffer */
sbuf[0] = PW_COMMAND_START_BYTE;
sbuf[1] = (unsigned char)(command_length);
memcpy(sbuf+2, command, command_length);
command_length += 2;
/* Add checksum */
sbuf[command_length] = calc_checksum(sbuf);
command_length += 1;
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upsdebug_hex (3, "send_command", sbuf, command_length);
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while (retry++ < PW_MAX_TRY) {
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if (retry == PW_MAX_TRY) {
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ser_send_char(upsfd, 0x1d); /* last retry is preceded by a ESC.*/
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usleep(250000);
}
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sent = ser_send_buf(upsfd, sbuf, command_length);
if (sent == command_length) {
return;
}
}
}
void send_read_command(unsigned char command)
{
send_command(&command, 1);
}
void send_write_command(unsigned char *command, int command_length)
{
send_command(command, command_length);
}
/* get the answer of a command from the ups. And check that the answer is for this command */
int get_answer(unsigned char *data, unsigned char command)
{
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unsigned char my_buf[128]; /* packet has a maximum length of 121+5 bytes */
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int length, end_length = 0, res, endblock = 0, start = 0;
unsigned char block_number, sequence, pre_sequence = 0;
while (endblock != 1){
do {
/* Read PW_COMMAND_START_BYTE byte */
res = ser_get_char(upsfd, my_buf, 1, 0);
if (res != 1) {
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upsdebugx(1,"Receive error (PW_COMMAND_START_BYTE): %d, cmd=%x!!!\n", res, command);
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return -1;
}
start++;
} while ((my_buf[0] != PW_COMMAND_START_BYTE) && (start < 128));
if (start == 128) {
ser_comm_fail("Receive error (PW_COMMAND_START_BYTE): packet not on start!!%x\n", my_buf[0]);
return -1;
}
/* Read block number byte */
res = ser_get_char(upsfd, my_buf+1, 1, 0);
if (res != 1) {
ser_comm_fail("Receive error (Block number): %d!!!\n", res);
return -1;
}
block_number = (unsigned char)my_buf[1];
if (command <= 0x43) {
if ((command - 0x30) != block_number){
ser_comm_fail("Receive error (Request command): %x!!!\n", block_number);
return -1;
}
}
if (command >= 0x89) {
if ((command == 0xA0) && (block_number != 0x01)){
ser_comm_fail("Receive error (Requested only mode command): %x!!!\n", block_number);
return -1;
}
if ((command != 0xA0) && (block_number != 0x09)){
ser_comm_fail("Receive error (Control command): %x!!!\n", block_number);
return -1;
}
}
/* Read data length byte */
res = ser_get_char(upsfd, my_buf+2, 1, 0);
if (res != 1) {
ser_comm_fail("Receive error (length): %d!!!\n", res);
return -1;
}
length = (unsigned char)my_buf[2];
if (length < 1) {
ser_comm_fail("Receive error (length): packet length %x!!!\n", length);
return -1;
}
/* Read sequence byte */
res = ser_get_char(upsfd, my_buf+3, 1, 0);
if (res != 1) {
ser_comm_fail("Receive error (sequence): %d!!!\n", res);
return -1;
}
sequence = (unsigned char)my_buf[3];
if ((sequence & 0x80) == 0x80) {
endblock = 1;
}
if ((sequence & 0x07) != (pre_sequence + 1)) {
ser_comm_fail("Not the right sequence received %x!!!\n", sequence);
return -1;
}
pre_sequence = sequence;
/* Try to read all the remainig bytes */
res = ser_get_buf_len(upsfd, my_buf+4, length, 1, 0);
if (res != length) {
ser_comm_fail("Receive error (data): got %d bytes instead of %d!!!\n", res, length);
return -1;
}
/* Get the checksum byte */
res = ser_get_char(upsfd, my_buf+(4+length), 1, 0);
if (res != 1) {
ser_comm_fail("Receive error (checksum): %x!!!\n", res);
return -1;
}
/* now we have the whole answer from the ups, we can checksum it */
if (!checksum_test(my_buf)) {
ser_comm_fail("checksum error! ");
return -1;
}
memcpy(data+end_length, my_buf+4, length);
end_length += length;
}
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upsdebug_hex (5, "get_answer", data, end_length);
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ser_comm_good();
return end_length;
}
static int command_sequence(unsigned char *command, int command_length, unsigned char *answer)
{
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int bytes_read, retry = 0;
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while (retry++ < PW_MAX_TRY) {
if (retry == PW_MAX_TRY) {
ser_flush_in(upsfd, "", 0);
}
send_write_command(command, command_length);
bytes_read = get_answer(answer, *command);
if (bytes_read > 0) {
return bytes_read;
}
}
return -1;
}
/* Sends a single command (length=1). and get the answer */
int command_read_sequence(unsigned char command, unsigned char *answer)
{
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int bytes_read;
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bytes_read = command_sequence(&command, 1, answer);
if (bytes_read < 1) {
ser_comm_fail("Error executing command");
}
return bytes_read;
}
/* Sends a setup command (length > 1) */
int command_write_sequence(unsigned char *command, int command_length, unsigned char *answer)
{
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int bytes_read;
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bytes_read = command_sequence(command, command_length, answer);
if (bytes_read < 1) {
ser_comm_fail("Error executing command");
}
return bytes_read;
}
void upsdrv_comm_good()
{
ser_comm_good();
}
void pw_comm_setup(const char *port)
{
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unsigned char command = PW_SET_REQ_ONLY_MODE;
unsigned char id_command = PW_ID_BLOCK_REQ;
unsigned char answer[256];
int i = 0, baud, mybaud = 0, ret = -1;
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if (getval("baud_rate") != NULL)
{
baud = atoi(getval("baud_rate"));
for(i = 0; i < PW_MAX_BAUD; i++) {
if (baud == pw_baud_rates[i].name) {
mybaud = pw_baud_rates[i].rate;
break;
}
}
if (mybaud == 0) {
fatalx(EXIT_FAILURE, "Specified baudrate \"%s\" is invalid!", getval("baud_rate"));
}
ser_set_speed(upsfd, device_path, mybaud);
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ser_send_char(upsfd, 0x1d); /* send ESC to take it out of menu */
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usleep(90000);
send_write_command(AUT, 4);
usleep(500000);
ret = command_sequence(&command, 1, answer);
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if (ret <= 0) {
usleep(500000);
ret = command_sequence(&id_command, 1, answer);
}
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if (ret > 0) {
upslogx(LOG_INFO, "Connected to UPS on %s with baudrate %d", port, baud);
return;
}
upslogx(LOG_ERR, "No response from UPS on %s with baudrate %d", port, baud);
}
upslogx(LOG_INFO, "Attempting to autodect baudrate");
for (i=0; i<PW_MAX_BAUD; i++) {
ser_set_speed(upsfd, device_path, pw_baud_rates[i].rate);
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ser_send_char(upsfd, 0x1d); /* send ESC to take it out of menu */
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usleep(90000);
send_write_command(AUT, 4);
usleep(500000);
ret = command_sequence(&command, 1, answer);
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if (ret <= 0) {
usleep(500000);
ret = command_sequence(&id_command, 1, answer);
}
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if (ret > 0) {
upslogx(LOG_INFO, "Connected to UPS on %s with baudrate %d", port, pw_baud_rates[i].name);
return;
}
upsdebugx(2, "No response from UPS on %s with baudrate %d", port, pw_baud_rates[i].name);
}
fatalx(EXIT_FAILURE, "Can't connect to the UPS on port %s!\n", port);
}
void upsdrv_initups(void)
{
upsfd = ser_open(device_path);
pw_comm_setup(device_path);
}
void upsdrv_cleanup(void)
{
/* free(dynamic_mem); */
ser_close(upsfd, device_path);
}
void upsdrv_reconnect(void)
{
}
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