path: root/drivers/firewire/fw-device.c

/*
 * Device probing and sysfs code.
 *
 * Copyright (C) 2005-2006  Kristian Hoegsberg <krh@bitplanet.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#include <linux/module.h>
#include <linux/wait.h>
#include <linux/errno.h>
#include <linux/kthread.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/idr.h>
#include <linux/string.h>
#include <linux/rwsem.h>
#include <linux/semaphore.h>
#include <asm/system.h>
#include <linux/ctype.h>
#include "fw-transaction.h"
#include "fw-topology.h"
#include "fw-device.h"

void fw_csr_iterator_init(struct fw_csr_iterator *ci, u32 * p)
{
	ci->p = p + 1;
	ci->end = ci->p + (p[0] >> 16);
}
EXPORT_SYMBOL(fw_csr_iterator_init);

int fw_csr_iterator_next(struct fw_csr_iterator *ci, int *key, int *value)
{
	*key = *ci->p >> 24;
	*value = *ci->p & 0xffffff;

	return ci->p++ < ci->end;
}
EXPORT_SYMBOL(fw_csr_iterator_next);

static int is_fw_unit(struct device *dev);

static int match_unit_directory(u32 * directory, const struct fw_device_id *id)
{
	struct fw_csr_iterator ci;
	int key, value, match;

	match = 0;
	fw_csr_iterator_init(&ci, directory);
	while (fw_csr_iterator_next(&ci, &key, &value)) {
		if (key == CSR_VENDOR && value == id->vendor)
			match |= FW_MATCH_VENDOR;
		if (key == CSR_MODEL && value == id->model)
			match |= FW_MATCH_MODEL;
		if (key == CSR_SPECIFIER_ID && value == id->specifier_id)
			match |= FW_MATCH_SPECIFIER_ID;
		if (key == CSR_VERSION && value == id->version)
			match |= FW_MATCH_VERSION;
	}

	return (match & id->match_flags) == id->match_flags;
}

static int fw_unit_match(struct device *dev, struct device_driver *drv)
{
	struct fw_unit *unit = fw_unit(dev);
	struct fw_driver *driver = fw_driver(drv);
	int i;

	/* We only allow binding to fw_units. */
	if (!is_fw_unit(dev))
		return 0;

	for (i = 0; driver->id_table[i].match_flags != 0; i++) {
		if (match_unit_directory(unit->directory, &driver->id_table[i]))
			return 1;
	}

	return 0;
}

static int get_modalias(struct fw_unit *unit, char *buffer, size_t buffer_size)
{
	struct fw_device *device = fw_device(unit->device.parent);
	struct fw_csr_iterator ci;

	int key, value;
	int vendor = 0;
	int model = 0;
	int specifier_id = 0;
	int version = 0;

	fw_csr_iterator_init(&ci, &device->config_rom[5]);
	while (fw_csr_iterator_next(&ci, &key, &value)) {
		switch (key) {
		case CSR_VENDOR:
			vendor = value;
			break;
		case CSR_MODEL:
			model = value;
			break;
		}
	}

	fw_csr_iterator_init(&ci, unit->directory);
	while (fw_csr_iterator_next(&ci, &key, &value)) {
		switch (key) {
		case CSR_SPECIFIER_ID:
			specifier_id = value;
			break;
		case CSR_VERSION:
			version = value;
			break;
		}
	}

	return snprintf(buffer, buffer_size,
			"ieee1394:ven%08Xmo%08Xsp%08Xver%08X",
			vendor, model, specifier_id, version);
}

static int
fw_unit_uevent(struct device *dev, struct kobj_uevent_env *