static int synth_probe()

in speakup/speakup_dtlk.c [316:366]

• 50 lines of code
• 10 McCabe index (conditional complexity)

static int synth_probe(struct spk_synth *synth)
{
	unsigned int port_val = 0;
	int i;
	struct synth_settings *sp;

	pr_info("Probing for DoubleTalk.\n");
	if (port_forced) {
		speakup_info.port_tts = port_forced;
		pr_info("probe forced to %x by kernel command line\n",
			speakup_info.port_tts);
		if ((port_forced & 0xf) != 0xf)
			pr_info("warning: port base should probably end with f\n");
		if (synth_request_region(speakup_info.port_tts - 1,
					 SYNTH_IO_EXTENT)) {
			pr_warn("sorry, port already reserved\n");
			return -EBUSY;
		}
		port_val = inw(speakup_info.port_tts - 1);
		synth_lpc = speakup_info.port_tts - 1;
	} else {
		for (i = 0; synth_portlist[i]; i++) {
			if (synth_request_region(synth_portlist[i],
						 SYNTH_IO_EXTENT))
				continue;
			port_val = inw(synth_portlist[i]) & 0xfbff;
			if (port_val == 0x107f) {
				synth_lpc = synth_portlist[i];
				speakup_info.port_tts = synth_lpc + 1;
				break;
			}
			synth_release_region(synth_portlist[i],
					     SYNTH_IO_EXTENT);
		}
	}
	port_val &= 0xfbff;
	if (port_val != 0x107f) {
		pr_info("DoubleTalk PC: not found\n");
		if (synth_lpc)
			synth_release_region(synth_lpc, SYNTH_IO_EXTENT);
		return -ENODEV;
	}
	while (inw_p(synth_lpc) != 0x147f)
		cpu_relax(); /* wait until it's ready */
	sp = synth_interrogate(synth);
	pr_info("%s: %03x-%03x, ROM ver %s, s/n %u, driver: %s\n",
		synth->long_name, synth_lpc, synth_lpc + SYNTH_IO_EXTENT - 1,
		sp->rom_version, sp->serial_number, synth->version);
	synth->alive = 1;
	return 0;
}