fw-device.c

linux 内核源代码

/*
 * Device probing and sysfs code.
 *
 * Copyright (C) 2005-2006  Kristian Hoegsberg <[e-mail]>
 *
 * 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/rwsem.h>
#include <asm/semaphore.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 *env)
{
	struct fw_unit *unit = fw_unit(dev);
	char modalias[64];

	get_modalias(unit, modalias, sizeof(modalias));

	if (add_uevent_var(env, "MODALIAS=%s", modalias))
		return -ENOMEM;

	return 0;
}

struct bus_type fw_bus_type = {
	.name = "firewire",
	.match = fw_unit_match,
};
EXPORT_SYMBOL(fw_bus_type);

struct fw_device *fw_device_get(struct fw_device *device)
{
	get_device(&device->device);

	return device;
}

void fw_device_put(struct fw_device *device)
{
	put_device(&device->device);
}

static void fw_device_release(struct device *dev)
{
	struct fw_device *device = fw_device(dev);
	unsigned long flags;

	/*
	 * Take the card lock so we don't set this to NULL while a
	 * FW_NODE_UPDATED callback is being handled.
	 */
	spin_lock_irqsave(&device->card->lock, flags);
	device->node->data = NULL;
	spin_unlock_irqrestore(&device->card->lock, flags);

	fw_node_put(device->node);
	fw_card_put(device->card);
	kfree(device->config_rom);
	kfree(device);
}

int fw_device_enable_phys_dma(struct fw_device *device)
{
	return device->card->driver->enable_phys_dma(device->card,
						     device->node_id,
						     device->generation);
}
EXPORT_SYMBOL(fw_device_enable_phys_dma);

struct config_rom_attribute {
	struct device_attribute attr;
	u32 key;
};

static ssize_t
show_immediate(struct device *dev, struct device_attribute *dattr, char *buf)
{
	struct config_rom_attribute *attr =
		container_of(dattr, struct config_rom_attribute, attr);
	struct fw_csr_iterator ci;
	u32 *dir;
	int key, value;

	if (is_fw_unit(dev))
		dir = fw_unit(dev)->directory;
	else
		dir = fw_device(dev)->config_rom + 5;

	fw_csr_iterator_init(&ci, dir);
	while (fw_csr_iterator_next(&ci, &key, &value))
		if (attr->key == key)
			return snprintf(buf, buf ? PAGE_SIZE : 0,
					"0x%06x\n", value);

	return -ENOENT;
}

#define IMMEDIATE_ATTR(name, key)				\
	{ __ATTR(name, S_IRUGO, show_immediate, NULL), key }

static ssize_t
show_text_leaf(struct device *dev, struct device_attribute *dattr, char *buf)
{
	struct config_rom_attribute *attr =
		container_of(dattr, struct config_rom_attribute, attr);
	struct fw_csr_iterator ci;
	u32 *dir, *block = NULL, *p, *end;
	int length, key, value, last_key = 0;
	char *b;

	if (is_fw_unit(dev))
		dir = fw_unit(dev)->directory;
	else
		dir = fw_device(dev)->config_rom + 5;

	fw_csr_iterator_init(&ci, dir);
	while (fw_csr_iterator_next(&ci, &key, &value)) {
		if (attr->key == last_key &&
		    key == (CSR_DESCRIPTOR | CSR_LEAF))
			block = ci.p - 1 + value;
		last_key = key;
	}

	if (block == NULL)
		return -ENOENT;

	length = min(block[0] >> 16, 256U);
	if (length < 3)
		return -ENOENT;

	if (block[1] != 0 || block[2] != 0)
		/* Unknown encoding. */
		return -ENOENT;

	if (buf == NULL)
		return length * 4;

	b = buf;
	end = &block[length + 1];
	for (p = &block[3]; p < end; p++, b += 4)
		* (u32 *) b = (__force u32) __cpu_to_be32(*p);

	/* Strip trailing whitespace and add newline. */
	while (b--, (isspace(*b) || *b == '\0') && b > buf);
	strcpy(b + 1, "\n");

	return b + 2 - buf;
}

#define TEXT_LEAF_ATTR(name, key)				\
	{ __ATTR(name, S_IRUGO, show_text_leaf, NULL), key }

static struct config_rom_attribute config_rom_attributes[] = {
	IMMEDIATE_ATTR(vendor, CSR_VENDOR),
	IMMEDIATE_ATTR(hardware_version, CSR_HARDWARE_VERSION),
	IMMEDIATE_ATTR(specifier_id, CSR_SPECIFIER_ID),
	IMMEDIATE_ATTR(version, CSR_VERSION),
	IMMEDIATE_ATTR(model, CSR_MODEL),
	TEXT_LEAF_ATTR(vendor_name, CSR_VENDOR),
	TEXT_LEAF_ATTR(model_name, CSR_MODEL),
	TEXT_LEAF_ATTR(hardware_version_name, CSR_HARDWARE_VERSION),
};

static void
init_fw_attribute_group(struct device *dev,
			struct device_attribute *attrs,
			struct fw_attribute_group *group)
{
	struct device_attribute *attr;
	int i, j;

	for (j = 0; attrs[j].attr.name != NULL; j++)
		group->attrs[j] = &attrs[j].attr;

	for (i = 0; i < ARRAY_SIZE(config_rom_attributes); i++) {
		attr = &config_rom_attributes[i].attr;
		if (attr->show(dev, attr, NULL) < 0)
			continue;
		group->attrs[j++] = &attr->attr;
	}

	BUG_ON(j >= ARRAY_SIZE(group->attrs));
	group->attrs[j++] = NULL;
	group->groups[0] = &group->group;
	group->groups[1] = NULL;
	group->group.attrs = group->attrs;
	dev->groups = group->groups;
}

static ssize_t
modalias_show(struct device *dev,
	      struct device_attribute *attr, char *buf)
{
	struct fw_unit *unit = fw_unit(dev);
	int length;

	length = get_modalias(unit, buf, PAGE_SIZE);
	strcpy(buf + length, "\n");

	return length + 1;
}

static ssize_t
rom_index_show(struct device *dev,
	       struct device_attribute *attr, char *buf)
{
	struct fw_device *device = fw_device(dev->parent);
	struct fw_unit *unit = fw_unit(dev);

	return snprintf(buf, PAGE_SIZE, "%d\n",
			(int)(unit->directory - device->config_rom));
}

static struct device_attribute fw_unit_attributes[] = {
	__ATTR_RO(modalias),
	__ATTR_RO(rom_index),
	__ATTR_NULL,
};

static ssize_t
config_rom_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct fw_device *device = fw_device(dev);

	memcpy(buf, device->config_rom, device->config_rom_length * 4);

	return device->config_rom_length * 4;
}

static ssize_t
guid_show(struct device *dev, struct device_attribute *attr, char *buf)
{
	struct fw_device *device = fw_device(dev);
	u64 guid;

	guid = ((u64)device->config_rom[3] << 32) | device->config_rom[4];

	return snprintf(buf, PAGE_SIZE, "0x%016llx\n",
			(unsigned long long)guid);
}

static struct device_attribute fw_device_attributes[] = {
	__ATTR_RO(config_rom),
	__ATTR_RO(guid),
	__ATTR_NULL,
};

struct read_quadlet_callback_data {
	struct completion done;
	int rcode;
	u32 data;
};

static void
complete_transaction(struct fw_card *card, int rcode,
		     void *payload, size_t length, void *data)
{
	struct read_quadlet_callback_data *callback_data = data;

	if (rcode == RCODE_COMPLETE)
		callback_data->data = be32_to_cpu(*(__be32 *)payload);
	callback_data->rcode = rcode;
	complete(&callback_data->done);
}

static int read_rom(struct fw_device *device, int index, u32 * data)
{
	struct read_quadlet_callback_data callback_data;
	struct fw_transaction t;
	u64 offset;

	init_completion(&callback_data.done);

	offset = 0xfffff0000400ULL + index * 4;
	fw_send_request(device->card, &t, TCODE_READ_QUADLET_REQUEST,
			device->node_id, device->generation, device->max_speed,
			offset, NULL, 4, complete_transaction, &callback_data);

	wait_for_completion(&callback_data.done);

	*data = callback_data.data;

	return callback_data.rcode;
}

static int read_bus_info_block(struct fw_device *device)
{
	static u32 rom[256];
	u32 stack[16], sp, key;
	int i, end, length;

	device->max_speed = SCODE_100;

	/* First read the bus info block. */
	for (i = 0; i < 5; i++) {
		if (read_rom(device, i, &rom[i]) != RCODE_COMPLETE)
			return -1;
		/*