380 lines
8.7 KiB
C
380 lines
8.7 KiB
C
/*
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* mjs copyright
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*
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* $FreeBSD$
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*/
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/*
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* "Plug and Play" functionality.
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*
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* We use the PnP enumerators to obtain identifiers for installed hardware,
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* and the contents of a database to determine modules to be loaded to support
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* such hardware.
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*/
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#include <stand.h>
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#include <string.h>
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#include <bootstrap.h>
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struct pnpinfo_stql pnp_devices;
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static int pnp_devices_initted = 0;
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static void pnp_discard(void);
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/*
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* Perform complete enumeration sweep
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*/
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COMMAND_SET(pnpscan, "pnpscan", "scan for PnP devices", pnp_scan);
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static int
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pnp_scan(int argc, char *argv[])
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{
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struct pnpinfo *pi;
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int hdlr;
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int verbose;
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int ch;
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if (pnp_devices_initted == 0) {
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STAILQ_INIT(&pnp_devices);
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pnp_devices_initted = 1;
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}
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verbose = 0;
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optind = 1;
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optreset = 1;
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while ((ch = getopt(argc, argv, "v")) != -1) {
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switch(ch) {
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case 'v':
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verbose = 1;
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break;
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case '?':
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default:
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/* getopt has already reported an error */
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return(CMD_OK);
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}
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}
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/* forget anything we think we knew */
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pnp_discard();
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/* iterate over all of the handlers */
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for (hdlr = 0; pnphandlers[hdlr] != NULL; hdlr++) {
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if (verbose)
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printf("Probing %s...\n", pnphandlers[hdlr]->pp_name);
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pnphandlers[hdlr]->pp_enumerate();
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}
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if (verbose) {
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pager_open();
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pager_output("PNP scan summary:\n");
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STAILQ_FOREACH(pi, &pnp_devices, pi_link) {
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pager_output(STAILQ_FIRST(&pi->pi_ident)->id_ident); /* first ident should be canonical */
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if (pi->pi_desc != NULL) {
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pager_output(" : ");
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pager_output(pi->pi_desc);
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}
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pager_output("\n");
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}
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pager_close();
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}
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return(CMD_OK);
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}
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#if 0
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/*
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* Try to load outstanding modules (eg. after disk change)
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*/
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COMMAND_SET(pnpload, "pnpload", "load modules for PnP devices", pnp_load);
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static int
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pnp_load(int argc, char *argv[])
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{
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struct pnpinfo *pi;
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char *modfname;
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/* find anything? */
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if (STAILQ_FIRST(&pnp_devices) != NULL) {
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/* check for kernel, assign modules handled by static drivers there */
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if (pnp_scankernel()) {
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command_errmsg = "cannot load drivers until kernel loaded";
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return(CMD_ERROR);
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}
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if (fname == NULL) {
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/* default paths */
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pnp_readconf("/boot/pnpdata.local");
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pnp_readconf("/boot/pnpdata");
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} else {
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if (pnp_readconf(fname)) {
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sprintf(command_errbuf, "can't read PnP information from '%s'", fname);
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return(CMD_ERROR);
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}
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}
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/* try to load any modules that have been nominated */
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STAILQ_FOREACH(pi, &pnp_devices, pi_link) {
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/* Already loaded? */
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if ((pi->pi_module != NULL) && (file_findfile(pi->pi_module, NULL) == NULL)) {
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modfname = malloc(strlen(pi->pi_module) + 4);
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sprintf(modfname, "%s.ko", pi->pi_module); /* XXX implicit knowledge of KLD module filenames */
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if (mod_load(pi->pi_module, pi->pi_argc, pi->pi_argv))
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printf("Could not load module '%s' for device '%s'\n", modfname, STAILQ_FIRST(&pi->pi_ident)->id_ident);
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free(modfname);
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}
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}
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}
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return(CMD_OK);
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}
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#endif
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/*
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* Throw away anything we think we know about PnP devices.
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*/
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static void
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pnp_discard(void)
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{
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struct pnpinfo *pi;
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while (STAILQ_FIRST(&pnp_devices) != NULL) {
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pi = STAILQ_FIRST(&pnp_devices);
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STAILQ_REMOVE_HEAD(&pnp_devices, pi_link);
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pnp_freeinfo(pi);
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}
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}
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#if 0
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/*
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* The PnP configuration database consists of a flat text file with
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* entries one per line. Valid lines are:
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*
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* # <text>
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*
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* This line is a comment, and ignored.
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*
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* [<name>]
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*
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* Entries following this line are for devices connected to the
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* bus <name>, At least one such entry must be encountered
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* before identifiers are recognised.
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*
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* ident=<identifier> rev=<revision> module=<module> args=<arguments>
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*
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* This line describes an identifier:module mapping. The 'ident'
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* and 'module' fields are required; the 'rev' field is currently
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* ignored (but should be used), and the 'args' field must come
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* last.
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*
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* Comments may be appended to lines; any character including or following
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* '#' on a line is ignored.
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*/
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static int
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pnp_readconf(char *path)
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{
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struct pnpinfo *pi;
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struct pnpident *id;
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int fd, line;
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char lbuf[128], *currbus, *ident, *revision, *module, *args;
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char *cp, *ep, *tp, c;
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/* try to open the file */
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if ((fd = open(path, O_RDONLY)) >= 0) {
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line = 0;
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currbus = NULL;
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while (fgetstr(lbuf, sizeof(lbuf), fd) > 0) {
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line++;
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/* Find the first non-space character on the line */
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for (cp = lbuf; (*cp != 0) && !isspace(*cp); cp++)
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;
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/* keep/discard? */
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if ((*cp == 0) || (*cp == '#'))
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continue;
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/* cut trailing comment? */
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if ((ep = strchr(cp, '#')) != NULL)
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*ep = 0;
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/* bus declaration? */
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if (*cp == '[') {
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if (((ep = strchr(cp, ']')) == NULL) || ((ep - cp) < 2)) {
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printf("%s line %d: bad bus specification\n", path, line);
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} else {
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if (currbus != NULL)
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free(currbus);
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*ep = 0;
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currbus = strdup(cp + 1);
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}
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continue;
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}
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/* XXX should we complain? */
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if (currbus == NULL)
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continue;
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/* mapping */
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for (ident = module = args = revision = NULL; *cp != 0;) {
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/* discard leading whitespace */
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if (isspace(*cp)) {
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cp++;
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continue;
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}
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/* scan for terminator, separator */
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for (ep = cp; (*ep != 0) && (*ep != '=') && !isspace(*ep); ep++)
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;
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if (*ep == '=') {
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*ep = 0;
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for (tp = ep + 1; (*tp != 0) && !isspace(*tp); tp++)
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;
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c = *tp;
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*tp = 0;
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if ((ident == NULL) && !strcmp(cp, "ident")) {
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ident = ep + 1;
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} else if ((revision == NULL) && !strcmp(cp, "revision")) {
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revision = ep + 1;
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} else if ((args == NULL) && !strcmp(cp, "args")) {
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*tp = c;
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while (*tp != 0) /* skip to end of string */
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tp++;
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args = ep + 1;
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} else {
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/* XXX complain? */
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}
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cp = tp;
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continue;
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}
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/* it's garbage or a keyword - ignore it for now */
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cp = ep;
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}
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/* we must have at least ident and module set to be interesting */
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if ((ident == NULL) || (module == NULL))
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continue;
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/*
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* Loop looking for module/bus that might match this, but aren't already
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* assigned.
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* XXX no revision parse/test here yet.
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*/
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STAILQ_FOREACH(pi, &pnp_devices, pi_link) {
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/* no driver assigned, bus matches OK */
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if ((pi->pi_module == NULL) &&
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!strcmp(pi->pi_handler->pp_name, currbus)) {
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/* scan idents, take first match */
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STAILQ_FOREACH(id, &pi->pi_ident, id_link)
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if (!strcmp(id->id_ident, ident))
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break;
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/* find a match? */
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if (id != NULL) {
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if (args != NULL)
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if (parse(&pi->pi_argc, &pi->pi_argv, args)) {
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printf("%s line %d: bad arguments\n", path, line);
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continue;
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}
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pi->pi_module = strdup(module);
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printf("use module '%s' for %s:%s\n", module, pi->pi_handler->pp_name, id->id_ident);
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}
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}
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}
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}
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close(fd);
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}
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return(CMD_OK);
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}
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static int
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pnp_scankernel(void)
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{
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return(CMD_OK);
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}
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#endif
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/*
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* Add a unique identifier to (pi)
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*/
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void
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pnp_addident(struct pnpinfo *pi, char *ident)
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{
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struct pnpident *id;
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STAILQ_FOREACH(id, &pi->pi_ident, id_link)
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if (!strcmp(id->id_ident, ident))
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return; /* already have this one */
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id = malloc(sizeof(struct pnpident));
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id->id_ident = strdup(ident);
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STAILQ_INSERT_TAIL(&pi->pi_ident, id, id_link);
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}
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/*
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* Allocate a new pnpinfo struct
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*/
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struct pnpinfo *
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pnp_allocinfo(void)
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{
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struct pnpinfo *pi;
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pi = malloc(sizeof(struct pnpinfo));
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bzero(pi, sizeof(struct pnpinfo));
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STAILQ_INIT(&pi->pi_ident);
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return(pi);
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}
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/*
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* Release storage held by a pnpinfo struct
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*/
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void
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pnp_freeinfo(struct pnpinfo *pi)
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{
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struct pnpident *id;
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while (!STAILQ_EMPTY(&pi->pi_ident)) {
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id = STAILQ_FIRST(&pi->pi_ident);
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STAILQ_REMOVE_HEAD(&pi->pi_ident, id_link);
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free(id->id_ident);
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free(id);
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}
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if (pi->pi_desc)
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free(pi->pi_desc);
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if (pi->pi_module)
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free(pi->pi_module);
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if (pi->pi_argv)
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free(pi->pi_argv);
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free(pi);
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}
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/*
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* Add a new pnpinfo struct to the list.
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*/
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void
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pnp_addinfo(struct pnpinfo *pi)
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{
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STAILQ_INSERT_TAIL(&pnp_devices, pi, pi_link);
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}
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/*
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* Format an EISA id as a string in standard ISA PnP format, AAAIIRR
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* where 'AAA' is the EISA vendor ID, II is the product ID and RR the revision ID.
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*/
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char *
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pnp_eisaformat(u_int8_t *data)
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{
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static char idbuf[8];
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const char hextoascii[] = "0123456789abcdef";
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idbuf[0] = '@' + ((data[0] & 0x7c) >> 2);
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idbuf[1] = '@' + (((data[0] & 0x3) << 3) + ((data[1] & 0xe0) >> 5));
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idbuf[2] = '@' + (data[1] & 0x1f);
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idbuf[3] = hextoascii[(data[2] >> 4)];
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idbuf[4] = hextoascii[(data[2] & 0xf)];
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idbuf[5] = hextoascii[(data[3] >> 4)];
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idbuf[6] = hextoascii[(data[3] & 0xf)];
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idbuf[7] = 0;
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return(idbuf);
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}
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