mirror of
git://projects.qi-hardware.com/ben-wpan.git
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462 lines
8.0 KiB
C
462 lines
8.0 KiB
C
/*
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* lib/atnet.c - Access functions library for network proxy
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*
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* Written 2011 by Werner Almesberger
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* Copyright 2011 Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <stdarg.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <assert.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netdb.h>
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#include "netio.h"
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#include "driver.h"
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#define DEFAULT_PORT "5440"
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struct atnet_dsc {
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struct netio *netio;
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int error;
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char *spec;
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char reply[1000];
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};
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static int dialog_vsend(struct atnet_dsc *dsc, const char *fmt, va_list ap)
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{
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va_list ap2;
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char *buf;
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int n, res;
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va_copy(ap2, ap);
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n = vsnprintf(NULL, 0, fmt, ap2);
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buf = malloc(n+1);
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if (!buf) {
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perror("malloc");
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return -1;
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}
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vsprintf(buf, fmt, ap);
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buf[n] = '\n';
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res = netio_write(dsc->netio, buf, n+1);
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free(buf);
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return res < 0 ? -1 : 0;
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}
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static int dialog_send(struct atnet_dsc *dsc, const char *fmt, ...)
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{
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va_list ap;
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int res;
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va_start(ap, fmt);
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res = dialog_vsend(dsc, fmt, ap);
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va_end(ap);
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return res;
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}
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static int dialog_recv(struct atnet_dsc *dsc)
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{
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int n;
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n = netio_read_until(dsc->netio,
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"\n", dsc->reply, sizeof(dsc->reply)-1, NULL);
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if (n < 0)
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return -1;
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dsc->reply[n] = 0;
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return dsc->reply[0] == '+' ? 0 : -1;
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}
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static int dialog(struct atnet_dsc *dsc, const char *fmt, ...)
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{
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va_list ap;
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int res;
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va_start(ap, fmt);
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res = dialog_vsend(dsc, fmt, ap);
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va_end(ap);
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if (res < 0)
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return res;
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return dialog_recv(dsc);
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}
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/* ----- error handling ---------------------------------------------------- */
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static int atnet_error(void *handle)
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{
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struct atnet_dsc *dsc = handle;
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return dsc->error;
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}
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static int atnet_clear_error(void *handle)
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{
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struct atnet_dsc *dsc = handle;
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int ret;
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ret = dsc->error;
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dsc->error = 0;
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return ret;
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}
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/* ----- open/close -------------------------------------------------------- */
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static void *atnet_open(const char *arg)
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{
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char *host = NULL, *comma;
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const char *port = DEFAULT_PORT;
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struct addrinfo *addrs;
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const struct addrinfo *addr;
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static struct addrinfo hint = { .ai_socktype = SOCK_STREAM };
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int res, s;
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struct atnet_dsc *dsc;
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if (arg) {
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host = strdup(arg);
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if (!host) {
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perror("strdup");
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return NULL;
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}
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comma = strchr(host, ',');
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if (comma) {
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*comma = 0;
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port = comma+1;
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}
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}
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res = getaddrinfo(arg && *host ? host : NULL, port, &hint, &addrs);
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if (res < 0) {
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fprintf(stderr, "%s: %s\n", arg, gai_strerror(res));
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free(host);
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return NULL;
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}
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free(host);
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for (addr = addrs; addr; addr = addr->ai_next) {
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s = socket(addr->ai_family, addr->ai_socktype,
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addr->ai_protocol);
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if (s < 0)
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continue;
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if (connect(s, addr->ai_addr, addr->ai_addrlen) >= 0)
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break;
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close(s);
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}
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if (!addr) {
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perror(arg);
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freeaddrinfo(addrs);
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return NULL;
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}
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freeaddrinfo(addrs);
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dsc = malloc(sizeof(*dsc));
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if (!dsc) {
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perror("malloc");
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exit(1);
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}
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dsc->netio = netio_open(s);
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if (!dsc->netio) {
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free(dsc);
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return NULL;
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}
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if (dialog_recv(dsc) < 0) {
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netio_close(dsc->netio);
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free(dsc);
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return NULL;
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}
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dsc->error = 0;
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dsc->spec = NULL;
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*dsc->reply = 0;
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return dsc;
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}
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static void atnet_close(void *handle)
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{
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struct atnet_dsc *dsc = handle;
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netio_close(dsc->netio);
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free(dsc->spec);
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}
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/* ----- driver specification ---------------------------------------------- */
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static const char *atnet_driver_spec(void *handle)
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{
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struct atnet_dsc *dsc = handle;
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if (dialog(dsc, "SPEC") < 0) {
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dsc->error = 1;
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return NULL;
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}
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free(dsc->spec);
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dsc->spec = strdup(dsc->reply+1);
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if (!dsc->spec) {
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perror("strdup");
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exit(1);
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}
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return dsc->spec;
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}
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/* ----- device mode ------------------------------------------------------- */
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static void atnet_reset(void *handle)
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{
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struct atnet_dsc *dsc = handle;
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if (dsc->error)
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return;
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if (dialog(dsc, "RESET") < 0)
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dsc->error = 1;
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}
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static void atnet_reset_rf(void *handle)
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{
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struct atnet_dsc *dsc = handle;
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if (dsc->error)
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return;
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if (dialog(dsc, "RESET_RF") < 0)
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dsc->error = 1;
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}
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static void atnet_test_mode(void *handle)
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{
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struct atnet_dsc *dsc = handle;
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if (dsc->error)
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return;
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if (dialog(dsc, "TEST") < 0)
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dsc->error = 1;
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}
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static void atnet_slp_tr(void *handle, int on)
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{
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struct atnet_dsc *dsc = handle;
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if (dsc->error)
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return;
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if (dialog(dsc, "SLP_TR %d", on) < 0)
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dsc->error = 1;
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}
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/* ----- register access --------------------------------------------------- */
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static void atnet_reg_write(void *handle, uint8_t reg, uint8_t value)
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{
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struct atnet_dsc *dsc = handle;
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if (dsc->error)
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return;
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if (dialog(dsc, "SET 0x%02x 0x%02x", reg, value) < 0)
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dsc->error = 1;
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}
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static uint8_t atnet_reg_read(void *handle, uint8_t reg)
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{
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struct atnet_dsc *dsc = handle;
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unsigned long value;
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char *end;
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if (dsc->error)
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return;
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if (dialog(dsc, "GET 0x%02x", reg) < 0) {
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dsc->error = 1;
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return 0;
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}
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value = strtoul(dsc->reply+1, &end, 0);
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if (*end || value > 255) {
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fprintf(stderr, "invalid response \"%s\"\n", dsc->reply+1);
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dsc->error = 1;
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return 0;
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}
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return value;
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}
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/* ----- frame buffer access ----------------------------------------------- */
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static void atnet_buf_write(void *handle, const void *buf, int size)
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{
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struct atnet_dsc *dsc = handle;
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char tmp[20];
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int n;
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if (dsc->error)
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return;
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n = snprintf(tmp, sizeof(tmp), "WRITE %d ", size);
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assert(n < sizeof(tmp));
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if (netio_write(dsc->netio, tmp, n) < 0) {
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dsc->error = 1;
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return;
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}
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if (netio_write(dsc->netio, buf, size) < 0) {
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dsc->error = 1;
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return;
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}
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if (netio_write(dsc->netio, "\n", 1) < 0) {
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dsc->error = 1;
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return;
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}
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if (dialog_recv(dsc) < 0)
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dsc->error = 1;
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}
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static int atnet_buf_read(void *handle, void *buf, int size)
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{
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struct atnet_dsc *dsc = handle;
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uint8_t tmp[200];
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int n, got = 0;
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unsigned long len = 0;
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char *end;
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if (dsc->error)
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return -1;
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if (dialog_send(dsc, "READ") < 0)
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goto fail;
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n = netio_read_until(dsc->netio, " ", tmp, sizeof(tmp)-1, NULL);
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if (n < 0)
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goto fail;
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tmp[n] = 0;
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if (*tmp == '-') {
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fprintf(stderr, "%s ", tmp+1);
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n = netio_read_until(dsc->netio,
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"\n", tmp, sizeof(tmp)-1, NULL);
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if (n >= 0) {
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tmp[n] = 0;
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fprintf(stderr, "%s\n", tmp);
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}
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goto fail;
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}
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if (*tmp != '+' || n < 2) /* +0<spc> */
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goto invalid;
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len = strtoul(tmp+1, &end, 0);
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if (*end)
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goto invalid;
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if (len > size) {
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fprintf(stderr, "buffer overflow\n");
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goto fail;
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}
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got = netio_read(dsc->netio, buf, len);
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if (got < 0)
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goto fail;
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if (netio_getc(dsc->netio, tmp) < 0)
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goto fail;
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if (*tmp == '\n')
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return len;
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invalid:
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fprintf(stderr, "invalid reponse\n");
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fail:
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dsc->error = 1;
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return -1;
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}
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/* ----- RF interrupt ------------------------------------------------------ */
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static int atnet_interrupt(void *handle)
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{
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struct atnet_dsc *dsc = handle;
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unsigned long value;
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char *end;
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if (dsc->error)
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return -1;
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if (dialog(dsc, "POLL") < 0) {
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dsc->error = 1;
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return -1;
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}
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value = strtoul(dsc->reply+1, &end, 0);
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if (*end || value > 1) {
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fprintf(stderr, "invalid response \"%s\"\n", dsc->reply+1);
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dsc->error = 1;
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return -1;
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}
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return value;
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}
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/* ----- CLKM handling ----------------------------------------------------- */
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static int atnet_set_clkm(void *handle, int mhz)
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{
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struct atnet_dsc *dsc = handle;
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return dialog(dsc, "CLKM %d", mhz) == 0;
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}
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/* ----- driver interface -------------------------------------------------- */
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struct atrf_driver atnet_driver = {
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.name = "net",
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.open = atnet_open,
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.close = atnet_close,
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.driver_spec = atnet_driver_spec,
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.error = atnet_error,
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.clear_error = atnet_clear_error,
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.reset = atnet_reset,
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.reset_rf = atnet_reset_rf,
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.test_mode = atnet_test_mode,
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.slp_tr = atnet_slp_tr,
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.set_clkm = atnet_set_clkm,
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.reg_write = atnet_reg_write,
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.reg_read = atnet_reg_read,
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.buf_write = atnet_buf_write,
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.buf_read = atnet_buf_read,
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.interrupt = atnet_interrupt,
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};
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