nodemgr.c

这个是uClinux下的ieee1394驱动

		ud->model_name_size = model_name_size;
		/* If there is no vendor name in the unit directory,
		   use the one in the root directory.  */
		ud->vendor_name = ne->vendor_name;
	}
	return ud;
}

/* This implementation currently only scans the config rom and its
 * immediate unit directories looking for software_id and
 * software_version entries, in order to get driver autoloading working.
 */

static void nodemgr_process_unit_directory(struct node_entry *ne, 
					   octlet_t address)
{
	struct unit_directory *ud;
	quadlet_t quad;
	quadlet_t *infop;
	int length;

	if (!(ud = nodemgr_scan_unit_directory(ne, address)))
		goto unit_directory_error;

	ud->ne = ne;
	ud->address = address;

	if (nodemgr_read_quadlet(ne->host, ne->nodeid, ne->generation,
				 address, &quad))
		goto unit_directory_error;
	length = CONFIG_ROM_DIRECTORY_LENGTH(quad) ;
	address += 4;

	infop = (quadlet_t *) ud->quadlets;
	for (; length > 0; length--, address += 4, infop++) {
		int code;
		quadlet_t value;
		quadlet_t *quadp;

		if (nodemgr_read_quadlet(ne->host, ne->nodeid, ne->generation,
					 address, &quad))
			goto unit_directory_error;
		code = CONFIG_ROM_KEY(quad) ;
		value = CONFIG_ROM_VALUE(quad);

		switch (code) {
		case CONFIG_ROM_VENDOR_ID:
			ud->vendor_id = value;
			ud->flags |= UNIT_DIRECTORY_VENDOR_ID;
			if ((ud->flags & UNIT_DIRECTORY_VENDOR_TEXT) != 0) {
				length--;
				address += 4;
				quadp = &(ud->quadlets[ud->count]);
				if (nodemgr_read_text_leaf(ne, address,
							   quadp) == 0
				    && quadp[0] == 0
				    && quadp[1] == 0) {
				    	/* We only support minimal
					   ASCII and English. */
					quadp[ud->vendor_name_size] = 0;
					ud->vendor_name
						= (const char *) &(quadp[2]);
				}
			}
			break;

		case CONFIG_ROM_MODEL_ID:
			ud->model_id = value;
			ud->flags |= UNIT_DIRECTORY_MODEL_ID;
			if ((ud->flags & UNIT_DIRECTORY_MODEL_TEXT) != 0) {
				length--;
				address += 4;
				quadp = &(ud->quadlets[ud->count + ud->vendor_name_size + 1]);
				if (nodemgr_read_text_leaf(ne, address,
							   quadp) == 0
				    && quadp[0] == 0
				    && quadp[1] == 0) {
				    	/* We only support minimal
					   ASCII and English. */
					quadp[ud->model_name_size] = 0;
					ud->model_name
						= (const char *) &(quadp[2]);
				}
			}
			break;

		case CONFIG_ROM_SPECIFIER_ID:
			ud->specifier_id = value;
			ud->flags |= UNIT_DIRECTORY_SPECIFIER_ID;
			break;

		case CONFIG_ROM_UNIT_SW_VERSION:
			ud->version = value;
			ud->flags |= UNIT_DIRECTORY_VERSION;
			break;

		case CONFIG_ROM_DESCRIPTOR_LEAF:
		case CONFIG_ROM_DESCRIPTOR_DIRECTORY:
			/* TODO: read strings... icons? */
			break;

		default:
			/* Which types of quadlets do we want to
			   store?  Only count immediate values and
			   CSR offsets for now.  */
			code &= CONFIG_ROM_KEY_TYPE_MASK;
			if ((code & 0x80) == 0)
				*infop = quad;
			break;
		}
	}

	list_add_tail(&ud->node_list, &ne->unit_directories);
	list_add_tail(&ud->driver_list, &unit_directory_list);

	return;

unit_directory_error:	
	if (ud != NULL)
		kfree(ud);
}

static void dump_directories (struct node_entry *ne)
{
#ifdef CONFIG_IEEE1394_VERBOSEDEBUG
	struct list_head *l;

	HPSB_DEBUG("vendor_id=0x%06x [%s], capabilities=0x%06x",
		   ne->vendor_id, ne->vendor_name ?: "Unknown",
		   ne->capabilities);
	list_for_each (l, &ne->unit_directories) {
		struct unit_directory *ud = list_entry (l, struct unit_directory, node_list);
		HPSB_DEBUG("unit directory:");
		if (ud->flags & UNIT_DIRECTORY_VENDOR_ID)
			HPSB_DEBUG("  vendor_id=0x%06x [%s]",
				   ud->vendor_id,
				   ud->vendor_name ?: "Unknown");
		if (ud->flags & UNIT_DIRECTORY_MODEL_ID)
			HPSB_DEBUG("  model_id=0x%06x [%s]",
				   ud->model_id,
				   ud->model_name ?: "Unknown");
		if (ud->flags & UNIT_DIRECTORY_SPECIFIER_ID)
			HPSB_DEBUG("  sw_specifier_id=0x%06x ", ud->specifier_id);
		if (ud->flags & UNIT_DIRECTORY_VERSION)
			HPSB_DEBUG("  sw_version=0x%06x ", ud->version);
	}
#endif
	return;
}

static void nodemgr_process_root_directory(struct node_entry *ne)
{
	octlet_t address;
	quadlet_t quad;
	int length;

	address = CSR_REGISTER_BASE + CSR_CONFIG_ROM;
	
	if (nodemgr_read_quadlet(ne->host, ne->nodeid, ne->generation,
				 address, &quad))
		return;
	address += 4 + CONFIG_ROM_BUS_INFO_LENGTH(quad) * 4;

	if (nodemgr_read_quadlet(ne->host, ne->nodeid, ne->generation,
				 address, &quad))
		return;
	length = CONFIG_ROM_ROOT_LENGTH(quad);
	address += 4;

	for (; length > 0; length--, address += 4) {
		int code, value;

		if (nodemgr_read_quadlet(ne->host, ne->nodeid, ne->generation,
					 address, &quad))
			return;
		code = CONFIG_ROM_KEY(quad);
		value = CONFIG_ROM_VALUE(quad);

		switch (code) {
		case CONFIG_ROM_VENDOR_ID:
			ne->vendor_id = value;
			/* Now check if there is a vendor name text
			   string.  */
			if (ne->vendor_name != NULL) {
				length--;
				address += 4;
				if (nodemgr_read_text_leaf(ne, address,
							   ne->quadlets)
				    != 0
				    || ne->quadlets [0] != 0
				    || ne->quadlets [1] != 0)
				    	/* We only support minimal
					   ASCII and English. */
					ne->vendor_name = NULL;
			}
			break;

		case CONFIG_ROM_NODE_CAPABILITES:
			ne->capabilities = value;
			break;

		case CONFIG_ROM_UNIT_DIRECTORY:
			nodemgr_process_unit_directory(ne, address + value * 4);
			break;			

		case CONFIG_ROM_DESCRIPTOR_LEAF:
		case CONFIG_ROM_DESCRIPTOR_DIRECTORY:
			/* TODO: read strings... icons? */
			break;
		}
	}

	dump_directories(ne);
}

#ifdef CONFIG_HOTPLUG

static void nodemgr_call_policy(char *verb, struct unit_directory *ud)
{
	char *argv [3], **envp, *buf, *scratch;
	int i = 0, value;

	/* User requested to disable hotplug when module was loaded. */
	if (nodemgr_disable_hotplug)
		return;

	if (!hotplug_path [0])
		return;
	if (!current->fs->root)
		return;
	if (!(envp = (char **) kmalloc(20 * sizeof (char *), GFP_KERNEL))) {
		HPSB_DEBUG ("ENOMEM");
		return;
	}
	if (!(buf = kmalloc(256, GFP_KERNEL))) {
		kfree(envp);
		HPSB_DEBUG("ENOMEM2");
		return;
	}

	/* only one standardized param to hotplug command: type */
	argv[0] = hotplug_path;
	argv[1] = "ieee1394";
	argv[2] = 0;

	/* minimal command environment */
	envp[i++] = "HOME=/";
	envp[i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";

#ifdef CONFIG_IEEE1394_VERBOSEDEBUG
	/* hint that policy agent should enter no-stdout debug mode */
	envp[i++] = "DEBUG=kernel";
#endif
	/* extensible set of named bus-specific parameters,
	 * supporting multiple driver selection algorithms.
	 */
	scratch = buf;

	envp[i++] = scratch;
	scratch += sprintf(scratch, "ACTION=%s", verb) + 1;
	envp[i++] = scratch;
	scratch += sprintf(scratch, "VENDOR_ID=%06x", ud->ne->vendor_id) + 1;
	envp[i++] = scratch;
	scratch += sprintf(scratch, "GUID=%016Lx", (long long unsigned)ud->ne->guid) + 1;
	envp[i++] = scratch;
	scratch += sprintf(scratch, "SPECIFIER_ID=%06x", ud->specifier_id) + 1;
	envp[i++] = scratch;
	scratch += sprintf(scratch, "VERSION=%06x", ud->version) + 1;
	envp[i++] = 0;

	/* NOTE: user mode daemons can call the agents too */
#ifdef CONFIG_IEEE1394_VERBOSEDEBUG
	HPSB_DEBUG("NodeMgr: %s %s %016Lx", argv[0], verb, (long long unsigned)ud->ne->guid);
#endif
	value = call_usermodehelper(argv[0], argv, envp);
	kfree(buf);
	kfree(envp);
	if (value != 0)
		HPSB_DEBUG("NodeMgr: hotplug policy returned %d", value);
}

#else

static inline void
nodemgr_call_policy(char *verb, struct unit_directory *ud)
{
#ifdef CONFIG_IEEE1394_VERBOSEDEBUG
	HPSB_DEBUG("NodeMgr: nodemgr_call_policy(): hotplug not enabled");
#endif
	return;
} 

#endif /* CONFIG_HOTPLUG */

static void nodemgr_claim_unit_directory(struct unit_directory *ud,
					 struct hpsb_protocol_driver *driver)
{
	ud->driver = driver;
	list_del(&ud->driver_list);
	list_add_tail(&ud->driver_list, &driver->unit_directories);
}

static void nodemgr_release_unit_directory(struct unit_directory *ud)
{
	ud->driver = NULL;
	list_del(&ud->driver_list);
	list_add_tail(&ud->driver_list, &unit_directory_list);
}

void hpsb_release_unit_directory(struct unit_directory *ud)
{
	down(&nodemgr_serialize);
	nodemgr_release_unit_directory(ud);
	up(&nodemgr_serialize);
}

static void nodemgr_free_unit_directories(struct node_entry *ne)
{
	struct list_head *lh;
	struct unit_directory *ud;

	lh = ne->unit_directories.next;
	while (lh != &ne->unit_directories) {
		ud = list_entry(lh, struct unit_directory, node_list);
		lh = lh->next;
		if (ud->driver && ud->driver->disconnect)
			ud->driver->disconnect(ud);
		nodemgr_release_unit_directory(ud);
		nodemgr_call_policy("remove", ud);
		list_del(&ud->driver_list);
		kfree(ud);
	}
}

static struct ieee1394_device_id *
nodemgr_match_driver(struct hpsb_protocol_driver *driver, 
		     struct unit_directory *ud)
{
	struct ieee1394_device_id *id;

	for (id = driver->id_table; id->match_flags != 0; id++) {
		if ((id->match_flags & IEEE1394_MATCH_VENDOR_ID) &&
		    id->vendor_id != ud->vendor_id)
			continue;

		if ((id->match_flags & IEEE1394_MATCH_MODEL_ID) &&
		    id->model_id != ud->model_id)
			continue;

		if ((id->match_flags & IEEE1394_MATCH_SPECIFIER_ID) &&
		    id->specifier_id != ud->specifier_id)
			continue;

		if ((id->match_flags & IEEE1394_MATCH_VERSION) &&
		    id->version != ud->version)
			continue;

		return id;
	}

	return NULL;
}

static struct hpsb_protocol_driver *
nodemgr_find_driver(struct unit_directory *ud)
{
	struct list_head *l;
	struct hpsb_protocol_driver *match, *driver;
	struct ieee1394_device_id *device_id;

	match = NULL;
	list_for_each(l, &driver_list) {
		driver = list_entry(l, struct hpsb_protocol_driver, list);
		device_id = nodemgr_match_driver(driver, ud);

		if (device_id != NULL) {
			match = driver;
			break;
		}
	}

	return match;
}

static void nodemgr_bind_drivers (struct node_entry *ne)
{
	struct list_head *lh;
	struct hpsb_protocol_driver *driver;
	struct unit_directory *ud;

	list_for_each(lh, &ne->unit_directories) {
		ud = list_entry(lh, struct unit_directory, node_list);
		driver = nodemgr_find_driver(ud);
		if (driver != NULL && driver->probe(ud) == 0)
			nodemgr_claim_unit_directory(ud, driver);
		nodemgr_call_policy("add", ud);
	}
}

int hpsb_register_protocol(struct hpsb_protocol_driver *driver)
{
	struct unit_directory *ud;
	struct list_head *lh;

	if (down_interruptible(&nodemgr_serialize))
		return -EINTR;

	list_add_tail(&driver->list, &driver_list);

	INIT_LIST_HEAD(&driver->unit_directories);
	lh = unit_directory_list.next;
	while (lh != &unit_directory_list) {
		ud = list_entry(lh, struct unit_directory, driver_list);
		lh = lh->next;
		if (nodemgr_match_driver(driver, ud) && driver->probe(ud) == 0)
			nodemgr_claim_unit_directory(ud, driver);
	}

	up(&nodemgr_serialize);

	/*
	 * Right now registration always succeeds, but maybe we should
	 * detect clashes in protocols handled by other drivers.
	 */

	return 0;
}

void hpsb_unregister_protocol(struct hpsb_protocol_driver *driver)
{
	struct list_head *lh;
	struct unit_directory *ud;

	down(&nodemgr_serialize);

	list_del(&driver->list);
	lh = driver->unit_directories.next;
	while (lh != &driver->unit_directories) {
		ud = list_entry(lh, struct unit_directory, driver_list);
		lh = lh->next;
		if (ud->driver && ud->driver->disconnect)
			ud->driver->disconnect(ud);
		nodemgr_release_unit_directory(ud);
	}

	up(&nodemgr_serialize);
}

static void nodemgr_process_config_rom(struct node_entry *ne, 
				       quadlet_t busoptions)
{
	ne->busopt.irmc		= (busoptions >> 31) & 1;
	ne->busopt.cmc		= (busoptions >> 30) & 1;
	ne->busopt.isc		= (busoptions >> 29) & 1;
	ne->busopt.bmc		= (busoptions >> 28) & 1;
	ne->busopt.pmc		= (busoptions >> 27) & 1;
	ne->busopt.cyc_clk_acc	= (busoptions >> 16) & 0xff;
	ne->busopt.max_rec	= 1 << (((busoptions >> 12) & 0xf) + 1);
	ne->busopt.generation	= (busoptions >> 4) & 0xf;
	ne->busopt.lnkspd	= busoptions & 0x7;

#ifdef CONFIG_IEEE1394_VERBOSEDEBUG
	HPSB_DEBUG("NodeMgr: raw=0x%08x irmc=%d cmc=%d isc=%d bmc=%d pmc=%d "
		   "cyc_clk_acc=%d max_rec=%d gen=%d lspd=%d",
		   busoptions, ne->busopt.irmc, ne->busopt.cmc,
		   ne->busopt.isc, ne->busopt.bmc, ne->busopt.pmc,
		   ne->busopt.cyc_clk_acc, ne->busopt.max_rec,
		   ne->busopt.generation, ne->busopt.lnkspd);
#endif