firewire: rename source files

The source files of firewire-core, firewire-ohci, firewire-sbp2, i.e.
 "drivers/firewire/fw-*.c"
are renamed to
 "drivers/firewire/core-*.c",
 "drivers/firewire/ohci.c",
 "drivers/firewire/sbp2.c".

The old fw- prefix was redundant to the directory name.  The new core-
prefix distinguishes the files according to which driver they belong to.

This change comes a little late, but still before further firewire
drivers are added as anticipated RSN.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

1 files changed, 1458 insertions, 0 deletions

diff --git a/drivers/firewire/core-cdev.c b/drivers/firewire/core-cdev.c
new file mode 100644
index 000000000000..042c04540474
--- /dev/null
+++ b/drivers/firewire/core-cdev.c
@@ -0,0 +1,1458 @@
+/*
+ * Char device for device raw access
+ *
+ * Copyright (C) 2005-2007  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/compat.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/errno.h>
+#include <linux/firewire.h>
+#include <linux/firewire-cdev.h>
+#include <linux/idr.h>
+#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/kref.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/poll.h>
+#include <linux/preempt.h>
+#include <linux/spinlock.h>
+#include <linux/time.h>
+#include <linux/vmalloc.h>
+#include <linux/wait.h>
+#include <linux/workqueue.h>
+
+#include <asm/system.h>
+#include <asm/uaccess.h>
+
+#include "core.h"
+
+struct client {
+	u32 version;
+	struct fw_device *device;
+
+	spinlock_t lock;
+	bool in_shutdown;
+	struct idr resource_idr;
+	struct list_head event_list;
+	wait_queue_head_t wait;
+	u64 bus_reset_closure;
+
+	struct fw_iso_context *iso_context;
+	u64 iso_closure;
+	struct fw_iso_buffer buffer;
+	unsigned long vm_start;
+
+	struct list_head link;
+	struct kref kref;
+};
+
+static inline void client_get(struct client *client)
+{
+	kref_get(&client->kref);
+}
+
+static void client_release(struct kref *kref)
+{
+	struct client *client = container_of(kref, struct client, kref);
+
+	fw_device_put(client->device);
+	kfree(client);
+}
+
+static void client_put(struct client *client)
+{
+	kref_put(&client->kref, client_release);
+}
+
+struct client_resource;
+typedef void (*client_resource_release_fn_t)(struct client *,
+					     struct client_resource *);
+struct client_resource {
+	client_resource_release_fn_t release;
+	int handle;
+};
+
+struct address_handler_resource {
+	struct client_resource resource;
+	struct fw_address_handler handler;
+	__u64 closure;
+	struct client *client;
+};
+
+struct outbound_transaction_resource {
+	struct client_resource resource;
+	struct fw_transaction transaction;
+};
+
+struct inbound_transaction_resource {
+	struct client_resource resource;
+	struct fw_request *request;
+	void *data;
+	size_t length;
+};
+
+struct descriptor_resource {
+	struct client_resource resource;
+	struct fw_descriptor descriptor;
+	u32 data[0];
+};
+
+struct iso_resource {
+	struct client_resource resource;
+	struct client *client;
+	/* Schedule work and access todo only with client->lock held. */
+	struct delayed_work work;
+	enum {ISO_RES_ALLOC, ISO_RES_REALLOC, ISO_RES_DEALLOC,
+	      ISO_RES_ALLOC_ONCE, ISO_RES_DEALLOC_ONCE,} todo;
+	int generation;
+	u64 channels;
+	s32 bandwidth;
+	struct iso_resource_event *e_alloc, *e_dealloc;
+};
+
+static void schedule_iso_resource(struct iso_resource *);
+static void release_iso_resource(struct client *, struct client_resource *);
+
+/*
+ * dequeue_event() just kfree()'s the event, so the event has to be
+ * the first field in a struct XYZ_event.
+ */
+struct event {
+	struct { void *data; size_t size; } v[2];
+	struct list_head link;
+};
+
+struct bus_reset_event {
+	struct event event;
+	struct fw_cdev_event_bus_reset reset;
+};
+
+struct outbound_transaction_event {
+	struct event event;
+	struct client *client;
+	struct outbound_transaction_resource r;
+	struct fw_cdev_event_response response;
+};
+
+struct inbound_transaction_event {
+	struct event event;
+	struct fw_cdev_event_request request;
+};
+
+struct iso_interrupt_event {
+	struct event event;
+	struct fw_cdev_event_iso_interrupt interrupt;
+};
+
+struct iso_resource_event {
+	struct event event;
+	struct fw_cdev_event_iso_resource resource;
+};
+
+static inline void __user *u64_to_uptr(__u64 value)
+{
+	return (void __user *)(unsigned long)value;
+}
+
+static inline __u64 uptr_to_u64(void __user *ptr)
+{
+	return (__u64)(unsigned long)ptr;
+}
+
+static int fw_device_op_open(struct inode *inode, struct file *file)
+{
+	struct fw_device *device;
+	struct client *client;
+
+	device = fw_device_get_by_devt(inode->i_rdev);
+	if (device == NULL)
+		return -ENODEV;
+
+	if (fw_device_is_shutdown(device)) {
+		fw_device_put(device);
+		return -ENODEV;
+	}
+
+	client = kzalloc(sizeof(*client), GFP_KERNEL);
+	if (client == NULL) {
+		fw_device_put(device);
+		return -ENOMEM;
+	}
+
+	client->device = device;
+	spin_lock_init(&client->lock);
+	idr_init(&client->resource_idr);
+	INIT_LIST_HEAD(&client->event_list);
+	init_waitqueue_head(&client->wait);
+	kref_init(&client->kref);
+
+	file->private_data = client;
+
+	mutex_lock(&device->client_list_mutex);
+	list_add_tail(&client->link, &device->client_list);
+	mutex_unlock(&device->client_list_mutex);
+
+	return 0;
+}
+
+static void queue_event(struct client *client, struct event *event,
+			void *data0, size_t size0, void *data1, size_t size1)
+{
+	unsigned long flags;
+
+	event->v[0].data = data0;
+	event->v[0].size = size0;
+	event->v[1].data = data1;
+	event->v[1].size = size1;
+
+	spin_lock_irqsave(&client->lock, flags);
+	if (client->in_shutdown)
+		kfree(event);
+	else
+		list_add_tail(&event->link, &client->event_list);
+	spin_unlock_irqrestore(&client->lock, flags);
+
+	wake_up_interruptible(&client->wait);
+}
+
+static int dequeue_event(struct client *client,
+			 char __user *buffer, size_t count)
+{
+	struct event *event;
+	size_t size, total;
+	int i, ret;
+
+	ret = wait_event_interruptible(client->wait,
+			!list_empty(&client->event_list) ||
+			fw_device_is_shutdown(client->device));
+	if (ret < 0)
+		return ret;
+
+	if (list_empty(&client->event_list) &&
+		       fw_device_is_shutdown(client->device))
+		return -ENODEV;
+
+	spin_lock_irq(&client->lock);
+	event = list_first_entry(&client->event_list, struct event, link);
+	list_del(&event->link);
+	spin_unlock_irq(&client->lock);
+
+	total = 0;
+	for (i = 0; i < ARRAY_SIZE(event->v) && total < count; i++) {
+		size = min(event->v[i].size, count - total);
+		if (copy_to_user(buffer + total, event->v[i].data, size)) {
+			ret = -EFAULT;
+			goto out;
+		}
+		total += size;
+	}
+	ret = total;
+
+ out:
+	kfree(event);
+
+	return ret;
+}
+
+static ssize_t fw_device_op_read(struct file *file, char __user *buffer,
+				 size_t count, loff_t *offset)
+{
+	struct client *client = file->private_data;
+
+	return dequeue_event(client, buffer, count);
+}
+
+static void fill_bus_reset_event(struct fw_cdev_event_bus_reset *event,
+				 struct client *client)
+{
+	struct fw_card *card = client->device->card;
+
+	spin_lock_irq(&card->lock);
+
+	event->closure	     = client->bus_reset_closure;
+	event->type          = FW_CDEV_EVENT_BUS_RESET;
+	event->generation    = client->device->generation;
+	event->node_id       = client->device->node_id;
+	event->local_node_id = card->local_node->node_id;
+	event->bm_node_id    = 0; /* FIXME: We don't track the BM. */
+	event->irm_node_id   = card->irm_node->node_id;
+	event->root_node_id  = card->root_node->node_id;
+
+	spin_unlock_irq(&card->lock);
+}
+
+static void for_each_client(struct fw_device *device,
+			    void (*callback)(struct client *client))
+{
+	struct client *c;
+
+	mutex_lock(&device->client_list_mutex);
+	list_for_each_entry(c, &device->client_list, link)
+		callback(c);
+	mutex_unlock(&device->client_list_mutex);
+}
+
+static int schedule_reallocations(int id, void *p, void *data)
+{
+	struct client_resource *r = p;
+
+	if (r->release == release_iso_resource)
+		schedule_iso_resource(container_of(r,
+					struct iso_resource, resource));
+	return 0;
+}
+
+static void queue_bus_reset_event(struct client *client)
+{
+	struct bus_reset_event *e;
+
+	e = kzalloc(sizeof(*e), GFP_KERNEL);
+	if (e == NULL) {
+		fw_notify("Out of memory when allocating bus reset event\n");
+		return;
+	}
+
+	fill_bus_reset_event(&e->reset, client);
+
+	queue_event(client, &e->event,
+		    &e->reset, sizeof(e->reset), NULL, 0);
+
+	spin_lock_irq(&client->lock);
+	idr_for_each(&client->resource_idr, schedule_reallocations, client);
+	spin_unlock_irq(&client->lock);
+}
+
+void fw_device_cdev_update(struct fw_device *device)
+{
+	for_each_client(device, queue_bus_reset_event);
+}
+
+static void wake_up_client(struct client *client)
+{
+	wake_up_interruptible(&client->wait);
+}
+
+void fw_device_cdev_remove(struct fw_device *device)
+{
+	for_each_client(device, wake_up_client);
+}
+
+static int ioctl_get_info(struct client *client, void *buffer)
+{
+	struct fw_cdev_get_info *get_info = buffer;
+	struct fw_cdev_event_bus_reset bus_reset;
+	unsigned long ret = 0;
+
+	client->version = get_info->version;
+	get_info->version = FW_CDEV_VERSION;
+	get_info->card = client->device->card->index;
+
+	down_read(&fw_device_rwsem);
+
+	if (get_info->rom != 0) {
+		void __user *uptr = u64_to_uptr(get_info->rom);
+		size_t want = get_info->rom_length;
+		size_t have = client->device->config_rom_length * 4;
+
+		ret = copy_to_user(uptr, client->device->config_rom,
+				   min(want, have));
+	}
+	get_info->rom_length = client->device->config_rom_length * 4;
+
+	up_read(&fw_device_rwsem);
+
+	if (ret != 0)
+		return -EFAULT;
+
+	client->bus_reset_closure = get_info->bus_reset_closure;
+	if (get_info->bus_reset != 0) {
+		void __user *uptr = u64_to_uptr(get_info->bus_reset);
+
+		fill_bus_reset_event(&bus_reset, client);
+		if (copy_to_user(uptr, &bus_reset, sizeof(bus_reset)))
+			return -EFAULT;
+	}
+
+	return 0;
+}
+
+static int add_client_resource(struct client *client,
+			       struct client_resource *resource, gfp_t gfp_mask)
+{
+	unsigned long flags;
+	int ret;
+
+ retry:
+	if (idr_pre_get(&client->resource_idr, gfp_mask) == 0)
+		return -ENOMEM;
+
+	spin_lock_irqsave(&client->lock, flags);
+	if (client->in_shutdown)
+		ret = -ECANCELED;
+	else
+		ret = idr_get_new(&client->resource_idr, resource,
+				  &resource->handle);
+	if (ret >= 0) {
+		client_get(client);
+		if (resource->release == release_iso_resource)
+			schedule_iso_resource(container_of(resource,
+						struct iso_resource, resource));
+	}
+	spin_unlock_irqrestore(&client->lock, flags);
+
+	if (ret == -EAGAIN)
+		goto retry;
+
+	return ret < 0 ? ret : 0;
+}
+
+static int release_client_resource(struct client *client, u32 handle,
+				   client_resource_release_fn_t release,
+				   struct client_resource **resource)
+{
+	struct client_resource *r;
+
+	spin_lock_irq(&client->lock);
+	if (client->in_shutdown)
+		r = NULL;
+	else
+		r = idr_find(&client->resource_idr, handle);
+	if (r && r->release == release)
+		idr_remove(&client->resource_idr, handle);
+	spin_unlock_irq(&client->lock);
+
+	if (!(r && r->release == release))
+		return -EINVAL;
+
+	if (resource)
+		*resource = r;
+	else
+		r->release(client, r);
+
+	client_put(client);
+
+	return 0;
+}
+
+static void release_transaction(struct client *client,
+				struct client_resource *resource)
+{
+	struct outbound_transaction_resource *r = container_of(resource,
+			struct outbound_transaction_resource, resource);
+
+	fw_cancel_transaction(client->device->card, &r->transaction);
+}
+
+static void complete_transaction(struct fw_card *card, int rcode,
+				 void *payload, size_t length, void *data)
+{
+	struct outbound_transaction_event *e = data;
+	struct fw_cdev_event_response *rsp = &e->response;
+	struct client *client = e->client;
+	unsigned long flags;
+
+	if (length < rsp->length)
+		rsp->length = length;
+	if (rcode == RCODE_COMPLETE)
+		memcpy(rsp->data, payload, rsp->length);
+
+	spin_lock_irqsave(&client->lock, flags);
+	/*
+	 * 1. If called while in shutdown, the idr tree must be left untouched.
+	 *    The idr handle will be removed and the client reference will be
+	 *    dropped later.
+	 * 2. If the call chain was release_client_resource ->
+	 *    release_transaction -> complete_transaction (instead of a normal
+	 *    conclusion of the transaction), i.e. if this resource was already
+	 *    unregistered from the idr, the client reference will be dropped
+	 *    by release_client_resource and we must not drop it here.
+	 */
+	if (!client->in_shutdown &&
+	    idr_find(&client->resource_idr, e->r.resource.handle)) {
+		idr_remove(&client->resource_idr, e->r.resource.handle);
+		/* Drop the idr's reference */
+		client_put(client);
+	}
+	spin_unlock_irqrestore(&client->lock, flags);
+
+	rsp->type = FW_CDEV_EVENT_RESPONSE;
+	rsp->rcode = rcode;
+
+	/*
+	 * In the case that sizeof(*rsp) doesn't align with the position of the
+	 * data, and the read is short, preserve an extra copy of the data
+	 * to stay compatible with a pre-2.6.27 bug.  Since the bug is harmless
+	 * for short reads and some apps depended on it, this is both safe
+	 * and prudent for compatibility.
+	 */
+	if (rsp->length <= sizeof(*rsp) - offsetof(typeof(*rsp), data))
+		queue_event(client, &e->event, rsp, sizeof(*rsp),
+			    rsp->data, rsp->length);
+	else
+		queue_event(client, &e->event, rsp, sizeof(*rsp) + rsp->length,
+			    NULL, 0);
+
+	/* Drop the transaction callback's reference */
+	client_put(client);
+}
+
+static int init_request(struct client *client,
+			struct fw_cdev_send_request *request,
+			int destination_id, int speed)
+{
+	struct outbound_transaction_event *e;
+	int ret;
+
+	if (request->tcode != TCODE_STREAM_DATA &&
+	    (request->length > 4096 || request->length > 512 << speed))
+		return -EIO;
+
+	e = kmalloc(sizeof(*e) + request->length, GFP_KERNEL);
+	if (e == NULL)
+		return -ENOMEM;
+
+	e->client = client;
+	e->response.length = request->length;
+	e->response.closure = request->closure;
+
+	if (request->data &&
+	    copy_from_user(e->response.data,
+			   u64_to_uptr(request->data), request->length)) {
+		ret = -EFAULT;
+		goto failed;
+	}
+
+	e->r.resource.release = release_transaction;
+	ret = add_client_resource(client, &e->r.resource, GFP_KERNEL);
+	if (ret < 0)
+		goto failed;
+
+	/* Get a reference for the transaction callback */
+	client_get(client);
+
+	fw_send_request(client->device->card, &e->r.transaction,
+			request->tcode, destination_id, request->generation,
+			speed, request->offset, e->response.data,
+			request->length, complete_transaction, e);
+	return 0;
+
+ failed:
+	kfree(e);
+
+	return ret;
+}
+
+static int ioctl_send_request(struct client *client, void *buffer)
+{
+	struct fw_cdev_send_request *request = buffer;
+
+	switch (request->tcode) {
+	case TCODE_WRITE_QUADLET_REQUEST:
+	case TCODE_WRITE_BLOCK_REQUEST:
+	case TCODE_READ_QUADLET_REQUEST:
+	case TCODE_READ_BLOCK_REQUEST:
+	case TCODE_LOCK_MASK_SWAP:
+	case TCODE_LOCK_COMPARE_SWAP:
+	case TCODE_LOCK_FETCH_ADD:
+	case TCODE_LOCK_LITTLE_ADD:
+	case TCODE_LOCK_BOUNDED_ADD:
+	case TCODE_LOCK_WRAP_ADD:
+	case TCODE_LOCK_VENDOR_DEPENDENT:
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return init_request(client, request, client->device->node_id,
+			    client->device->max_speed);
+}
+
+static void release_request(struct client *client,
+			    struct client_resource *resource)
+{
+	struct inbound_transaction_resource *r = container_of(resource,
+			struct inbound_transaction_resource, resource);
+
+	fw_send_response(client->device->card, r->request,
+			 RCODE_CONFLICT_ERROR);
+	kfree(r);
+}
+
+static void handle_request(struct fw_card *card, struct fw_request *request,
+			   int tcode, int destination, int source,
+			   int generation, int speed,
+			   unsigned long long offset,
+			   void *payload, size_t length, void *callback_data)
+{
+	struct address_handler_resource *handler = callback_data;
+	struct inbound_transaction_resource *r;
+	struct inbound_transaction_event *e;
+	int ret;
+
+	r = kmalloc(sizeof(*r), GFP_ATOMIC);
+	e = kmalloc(sizeof(*e), GFP_ATOMIC);
+	if (r == NULL || e == NULL)
+		goto failed;
+
+	r->request = request;
+	r->data    = payload;
+	r->length  = length;
+
+	r->resource.release = release_request;
+	ret = add_client_resource(handler->client, &r->resource, GFP_ATOMIC);
+	if (ret < 0)
+		goto failed;
+
+	e->request.type    = FW_CDEV_EVENT_REQUEST;
+	e->request.tcode   = tcode;
+	e->request.offset  = offset;
+	e->request.length  = length;
+	e->request.handle  = r->resource.handle;
+	e->request.closure = handler->closure;
+
+	queue_event(handler->client, &e->event,
+		    &e->request, sizeof(e->request), payload, length);
+	return;
+
+ failed:
+	kfree(r);
+	kfree(e);
+	fw_send_response(card, request, RCODE_CONFLICT_ERROR);
+}
+
+static void release_address_handler(struct client *client,
+				    struct client_resource *resource)
+{
+	struct address_handler_resource *r =
+	    container_of(resource, struct address_handler_resource, resource);
+
+	fw_core_remove_address_handler(&r->handler);
+	kfree(r);
+}
+
+static int ioctl_allocate(struct client *client, void *buffer)
+{
+	struct fw_cdev_allocate *request = buffer;
+	struct address_handler_resource *r;
+	struct fw_address_region region;
+	int ret;
+
+	r = kmalloc(sizeof(*r), GFP_KERNEL);
+	if (r == NULL)
+		return -ENOMEM;
+
+	region.start = request->offset;
+	region.end = request->offset + request->length;
+	r->handler.length = request->length;
+	r->handler.address_callback = handle_request;
+	r->handler.callback_data = r;
+	r->closure = request->closure;
+	r->client = client;
+
+	ret = fw_core_add_address_handler(&r->handler, &region);
+	if (ret < 0) {
+		kfree(r);
+		return ret;
+	}
+
+	r->resource.release = release_address_handler;
+	ret = add_client_resource(client, &r->resource, GFP_KERNEL);
+	if (ret < 0) {
+		release_address_handler(client, &r->resource);
+		return ret;
+	}
+	request->handle = r->resource.handle;
+
+	return 0;
+}
+
+static int ioctl_deallocate(struct client *client, void *buffer)
+{
+	struct fw_cdev_deallocate *request = buffer;
+
+	return release_client_resource(client, request->handle,
+				       release_address_handler, NULL);
+}
+
+static int ioctl_send_response(struct client *client, void *buffer)
+{
+	struct fw_cdev_send_response *request = buffer;
+	struct client_resource *resource;
+	struct inbound_transaction_resource *r;
+
+	if (release_client_resource(client, request->handle,
+				    release_request, &resource) < 0)
+		return -EINVAL;
+
+	r = container_of(resource, struct inbound_transaction_resource,
+			 resource);
+	if (request->length < r->length)
+		r->length = request->length;
+	if (copy_from_user(r->data, u64_to_uptr(request->data), r->length))
+		return -EFAULT;
+
+	fw_send_response(client->device->card, r->request, request->rcode);
+	kfree(r);
+
+	return 0;
+}
+
+static int ioctl_initiate_bus_reset(struct client *client, void *buffer)
+{
+	struct fw_cdev_initiate_bus_reset *request = buffer;
+	int short_reset;
+
+	short_reset = (request->type == FW_CDEV_SHORT_RESET);
+
+	return fw_core_initiate_bus_reset(client->device->card, short_reset);
+}
+
+static void release_descriptor(struct client *client,
+			       struct client_resource *resource)
+{
+	struct descriptor_resource *r =
+		container_of(resource, struct descriptor_resource, resource);
+
+	fw_core_remove_descriptor(&r->descriptor);
+	kfree(r);
+}
+
+static int ioctl_add_descriptor(struct client *client, void *buffer)
+{
+	struct fw_cdev_add_descriptor *request = buffer;
+	struct descriptor_resource *r;
+	int ret;
+
+	/* Access policy: Allow this ioctl only on local nodes' device files. */
+	if (!client->device->is_local)
+		return -ENOSYS;
+
+	if (request->length > 256)
+		return -EINVAL;
+
+	r = kmalloc(sizeof(*r) + request->length * 4, GFP_KERNEL);
+	if (r == NULL)
+		return -ENOMEM;
+
+	if (copy_from_user(r->data,
+			   u64_to_uptr(request->data), request->length * 4)) {
+		ret = -EFAULT;
+		goto failed;
+	}
+
+	r->descriptor.length    = request->length;
+	r->descriptor.immediate = request->immediate;
+	r->descriptor.key       = request->key;
+	r->descriptor.data      = r->data;
+
+	ret = fw_core_add_descriptor(&r->descriptor);
+	if (ret < 0)
+		goto failed;
+
+	r->resource.release = release_descriptor;
+	ret = add_client_resource(client, &r->resource, GFP_KERNEL);
+	if (ret < 0) {
+		fw_core_remove_descriptor(&r->descriptor);
+		goto failed;
+	}
+	request->handle = r->resource.handle;
+
+	return 0;
+ failed:
+	kfree(r);
+
+	return ret;
+}
+
+static int ioctl_remove_descriptor(struct client *client, void *buffer)
+{
+	struct fw_cdev_remove_descriptor *request = buffer;
+
+	return release_client_resource(client, request->handle,
+				       release_descriptor, NULL);
+}
+
+static void iso_callback(struct fw_iso_context *context, u32 cycle,
+			 size_t header_length, void *header, void *data)
+{
+	struct client *client = data;
+	struct iso_interrupt_event *e;
+
+	e = kzalloc(sizeof(*e) + header_length, GFP_ATOMIC);
+	if (e == NULL)
+		return;
+
+	e->interrupt.type      = FW_CDEV_EVENT_ISO_INTERRUPT;
+	e->interrupt.closure   = client->iso_closure;
+	e->interrupt.cycle     = cycle;
+	e->interrupt.header_length = header_length;
+	memcpy(e->interrupt.header, header, header_length);
+	queue_event(client, &e->event, &e->interrupt,
+		    sizeof(e->interrupt) + header_length, NULL, 0);
+}
+
+static int ioctl_create_iso_context(struct client *client, void *buffer)
+{
+	struct fw_cdev_create_iso_context *request = buffer;
+	struct fw_iso_context *context;
+
+	/* We only support one context at this time. */
+	if (client->iso_context != NULL)
+		return -EBUSY;
+
+	if (request->channel > 63)
+		return -EINVAL;
+
+	switch (request->type) {
+	case FW_ISO_CONTEXT_RECEIVE:
+		if (request->header_size < 4 || (request->header_size & 3))
+			return -EINVAL;
+
+		break;
+
+	case FW_ISO_CONTEXT_TRANSMIT:
+		if (request->speed > SCODE_3200)
+			return -EINVAL;
+
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	context =  fw_iso_context_create(client->device->card,
+					 request->type,
+					 request->channel,
+					 request->speed,
+					 request->header_size,
+					 iso_callback, client);
+	if (IS_ERR(context))
+		return PTR_ERR(context);
+
+	client->iso_closure = request->closure;
+	client->iso_context = context;
+
+	/* We only support one context at this time. */
+	request->handle = 0;
+
+	return 0;
+}
+
+/* Macros for decoding the iso packet control header. */
+#define GET_PAYLOAD_LENGTH(v)	((v) & 0xffff)
+#define GET_INTERRUPT(v)	(((v) >> 16) & 0x01)
+#define GET_SKIP(v)		(((v) >> 17) & 0x01)
+#define GET_TAG(v)		(((v) >> 18) & 0x03)
+#define GET_SY(v)		(((v) >> 20) & 0x0f)
+#define GET_HEADER_LENGTH(v)	(((v) >> 24) & 0xff)
+
+static int ioctl_queue_iso(struct client *client, void *buffer)
+{
+	struct fw_cdev_queue_iso *request = buffer;
+	struct fw_cdev_iso_packet __user *p, *end, *next;
+	struct fw_iso_context *ctx = client->iso_context;
+	unsigned long payload, buffer_end, header_length;
+	u32 control;
+	int count;
+	struct {
+		struct fw_iso_packet packet;
+		u8 header[256];
+	} u;
+
+	if (ctx == NULL || request->handle != 0)
+		return -EINVAL;
+
+	/*
+	 * If the user passes a non-NULL data pointer, has mmap()'ed
+	 * the iso buffer, and the pointer points inside the buffer,
+	 * we setup the payload pointers accordingly.  Otherwise we
+	 * set them both to 0, which will still let packets with
+	 * payload_length == 0 through.  In other words, if no packets
+	 * use the indirect payload, the iso buffer need not be mapped
+	 * and the request->data pointer is ignored.
+	 */
+
+	payload = (unsigned long)request->data - client->vm_start;
+	buffer_end = client->buffer.page_count << PAGE_SHIFT;
+	if (request->data == 0 || client->buffer.pages == NULL ||
+	    payload >= buffer_end) {
+		payload = 0;
+		buffer_end = 0;
+	}
+
+	p = (struct fw_cdev_iso_packet __user *)u64_to_uptr(request->packets);
+
+	if (!access_ok(VERIFY_READ, p, request->size))
+		return -EFAULT;
+
+	end = (void __user *)p + request->size;
+	count = 0;
+	while (p < end) {
+		if (get_user(control, &p->control))
+			return -EFAULT;
+		u.packet.payload_length = GET_PAYLOAD_LENGTH(control);
+		u.packet.interrupt = GET_INTERRUPT(control);
+		u.packet.skip = GET_SKIP(control);
+		u.packet.tag = GET_TAG(control);
+		u.packet.sy = GET_SY(control);
+		u.packet.header_length = GET_HEADER_LENGTH(control);
+
+		if (ctx->type == FW_ISO_CONTEXT_TRANSMIT) {
+			header_length = u.packet.header_length;
+		} else {
+			/*
+			 * We require that header_length is a multiple of
+			 * the fixed header size, ctx->header_size.
+			 */
+			if (ctx->header_size == 0) {
+				if (u.packet.header_length > 0)
+					return -EINVAL;
+			} else if (u.packet.header_length % ctx->header_size != 0) {
+				return -EINVAL;
+			}
+			header_length = 0;
+		}
+
+		next = (struct fw_cdev_iso_packet __user *)
+			&p->header[header_length / 4];
+		if (next > end)
+			return -EINVAL;
+		if (__copy_from_user
+		    (u.packet.header, p->header, header_length))
+			return -EFAULT;
+		if (u.packet.skip && ctx->type == FW_ISO_CONTEXT_TRANSMIT &&
+		    u.packet.header_length + u.packet.payload_length > 0)
+			return -EINVAL;
+		if (payload + u.packet.payload_length > buffer_end)
+			return -EINVAL;
+
+		if (fw_iso_context_queue(ctx, &u.packet,
+					 &client->buffer, payload))
+			break;
+
+		p = next;
+		payload += u.packet.payload_length;
+		count++;
+	}
+
+	request->size    -= uptr_to_u64(p) - request->packets;
+	request->packets  = uptr_to_u64(p);
+	request->data     = client->vm_start + payload;
+
+	return count;
+}
+
+static int ioctl_start_iso(struct client *client, void *buffer)
+{
+	struct fw_cdev_start_iso *request = buffer;
+
+	if (client->iso_context == NULL || request->handle != 0)
+		return -EINVAL;
+
+	if (client->iso_context->type == FW_ISO_CONTEXT_RECEIVE) {
+		if (request->tags == 0 || request->tags > 15)
+			return -EINVAL;
+
+		if (request->sync > 15)
+			return -EINVAL;
+	}
+
+	return fw_iso_context_start(client->iso_context, request->cycle,
+				    request->sync, request->tags);
+}
+
+static int ioctl_stop_iso(struct client *client, void *buffer)
+{
+	struct fw_cdev_stop_iso *request = buffer;
+
+	if (client->iso_context == NULL || request->handle != 0)
+		return -EINVAL;
+
+	return fw_iso_context_stop(client->iso_context);
+}
+
+static int ioctl_get_cycle_timer(struct client *client, void *buffer)
+{
+	struct fw_cdev_get_cycle_timer *request = buffer;
+	struct fw_card *card = client->device->card;
+	unsigned long long bus_time;
+	struct timeval tv;
+	unsigned long flags;
+
+	preempt_disable();
+	local_irq_save(flags);
+
+	bus_time = card->driver->get_bus_time(card);
+	do_gettimeofday(&tv);
+
+	local_irq_restore(flags);
+	preempt_enable();
+
+	request->local_time = tv.tv_sec * 1000000ULL + tv.tv_usec;
+	request->cycle_timer = bus_time & 0xffffffff;
+	return 0;
+}
+
+static void iso_resource_work(struct work_struct *work)
+{
+	struct iso_resource_event *e;
+	struct iso_resource *r =
+			container_of(work, struct iso_resource, work.work);
+	struct client *client = r->client;
+	int generation, channel, bandwidth, todo;
+	bool skip, free, success;
+
+	spin_lock_irq(&client->lock);
+	generation = client->device->generation;
+	todo = r->todo;
+	/* Allow 1000ms grace period for other reallocations. */
+	if (todo == ISO_RES_ALLOC &&
+	    time_is_after_jiffies(client->device->card->reset_jiffies + HZ)) {
+		if (schedule_delayed_work(&r->work, DIV_ROUND_UP(HZ, 3)))
+			client_get(client);
+		skip = true;
+	} else {
+		/* We could be called twice within the same generation. */
+		skip = todo == ISO_RES_REALLOC &&
+		       r->generation == generation;
+	}
+	free = todo == ISO_RES_DEALLOC ||
+	       todo == ISO_RES_ALLOC_ONCE ||
+	       todo == ISO_RES_DEALLOC_ONCE;
+	r->generation = generation;
+	spin_unlock_irq(&client->lock);
+
+	if (skip)
+		goto out;
+
+	bandwidth = r->bandwidth;
+
+	fw_iso_resource_manage(client->device->card, generation,
+			r->channels, &channel, &bandwidth,
+			todo == ISO_RES_ALLOC ||
+			todo == ISO_RES_REALLOC ||
+			todo == ISO_RES_ALLOC_ONCE);
+	/*
+	 * Is this generation outdated already?  As long as this resource sticks
+	 * in the idr, it will be scheduled again for a newer generation or at
+	 * shutdown.
+	 */
+	if (channel == -EAGAIN &&
+	    (todo == ISO_RES_ALLOC || todo == ISO_RES_REALLOC))
+		goto out;
+
+	success = channel >= 0 || bandwidth > 0;
+
+	spin_lock_irq(&client->lock);
+	/*
+	 * Transit from allocation to reallocation, except if the client
+	 * requested deallocation in the meantime.
+	 */
+	if (r->todo == ISO_RES_ALLOC)
+		r->todo = ISO_RES_REALLOC;
+	/*
+	 * Allocation or reallocation failure?  Pull this resource out of the
+	 * idr and prepare for deletion, unless the client is shutting down.
+	 */
+	if (r->todo == ISO_RES_REALLOC && !success &&
+	    !client->in_shutdown &&
+	    idr_find(&client->resource_idr, r->resource.handle)) {
+		idr_remove(&client->resource_idr, r->resource.handle);
+		client_put(client);
+		free = true;
+	}
+	spin_unlock_irq(&client->lock);
+
+	if (todo == ISO_RES_ALLOC && channel >= 0)
+		r->channels = 1ULL << channel;
+
+	if (todo == ISO_RES_REALLOC && success)
+		goto out;
+
+	if (todo == ISO_RES_ALLOC || todo == ISO_RES_ALLOC_ONCE) {
+		e = r->e_alloc;
+		r->e_alloc = NULL;
+	} else {
+		e = r->e_dealloc;
+		r->e_dealloc = NULL;
+	}
+	e->resource.handle	= r->resource.handle;
+	e->resource.channel	= channel;
+	e->resource.bandwidth	= bandwidth;
+
+	queue_event(client, &e->event,
+		    &e->resource, sizeof(e->resource), NULL, 0);
+
+	if (free) {
+		cancel_delayed_work(&r->work);
+		kfree(r->e_alloc);
+		kfree(r->e_dealloc);
+		kfree(r);
+	}
+ out:
+	client_put(client);
+}
+
+static void schedule_iso_resource(struct iso_resource *r)
+{
+	client_get(r->client);
+	if (!schedule_delayed_work(&r->work, 0))
+		client_put(r->client);
+}
+
+static void release_iso_resource(struct client *client,
+				 struct client_resource *resource)
+{
+	struct iso_resource *r =
+		container_of(resource, struct iso_resource, resource);
+
+	spin_lock_irq(&client->lock);
+	r->todo = ISO_RES_DEALLOC;
+	schedule_iso_resource(r);
+	spin_unlock_irq(&client->lock);
+}
+
+static int init_iso_resource(struct client *client,
+		struct fw_cdev_allocate_iso_resource *request, int todo)
+{
+	struct iso_resource_event *e1, *e2;
+	struct iso_resource *r;
+	int ret;
+
+	if ((request->channels == 0 && request->bandwidth == 0) ||
+	    request->bandwidth > BANDWIDTH_AVAILABLE_INITIAL ||
+	    request->bandwidth < 0)
+		return -EINVAL;
+
+	r  = kmalloc(sizeof(*r), GFP_KERNEL);
+	e1 = kmalloc(sizeof(*e1), GFP_KERNEL);
+	e2 = kmalloc(sizeof(*e2), GFP_KERNEL);
+	if (r == NULL || e1 == NULL || e2 == NULL) {
+		ret = -ENOMEM;
+		goto fail;
+	}
+
+	INIT_DELAYED_WORK(&r->work, iso_resource_work);
+	r->client	= client;
+	r->todo		= todo;
+	r->generation	= -1;
+	r->channels	= request->channels;
+	r->bandwidth	= request->bandwidth;
+	r->e_alloc	= e1;
+	r->e_dealloc	= e2;
+
+	e1->resource.closure	= request->closure;
+	e1->resource.type	= FW_CDEV_EVENT_ISO_RESOURCE_ALLOCATED;
+	e2->resource.closure	= request->closure;
+	e2->resource.type	= FW_CDEV_EVENT_ISO_RESOURCE_DEALLOCATED;
+
+	if (todo == ISO_RES_ALLOC) {
+		r->resource.release = release_iso_resource;
+		ret = add_client_resource(client, &r->resource, GFP_KERNEL);
+		if (ret < 0)
+			goto fail;
+	} else {
+		r->resource.release = NULL;
+		r->resource.handle = -1;
+		schedule_iso_resource(r);
+	}
+	request->handle = r->resource.handle;
+
+	return 0;
+ fail:
+	kfree(r);
+	kfree(e1);
+	kfree(e2);
+
+	return ret;
+}
+
+static int ioctl_allocate_iso_resource(struct client *client, void *buffer)
+{
+	struct fw_cdev_allocate_iso_resource *request = buffer;
+
+	return init_iso_resource(client, request, ISO_RES_ALLOC);
+}
+
+static int ioctl_deallocate_iso_resource(struct client *client, void *buffer)
+{
+	struct fw_cdev_deallocate *request = buffer;
+
+	return release_client_resource(client, request->handle,
+				       release_iso_resource, NULL);
+}
+
+static int ioctl_allocate_iso_resource_once(struct client *client, void *buffer)
+{
+	struct fw_cdev_allocate_iso_resource *request = buffer;
+
+	return init_iso_resource(client, request, ISO_RES_ALLOC_ONCE);
+}
+
+static int ioctl_deallocate_iso_resource_once(struct client *client, void *buffer)
+{
+	struct fw_cdev_allocate_iso_resource *request = buffer;
+
+	return init_iso_resource(client, request, ISO_RES_DEALLOC_ONCE);
+}
+
+/*
+ * Returns a speed code:  Maximum speed to or from this device,
+ * limited by the device's link speed, the local node's link speed,
+ * and all PHY port speeds between the two links.
+ */
+static int ioctl_get_speed(struct client *client, void *buffer)
+{
+	return client->device->max_speed;
+}
+
+static int ioctl_send_broadcast_request(struct client *client, void *buffer)
+{
+	struct fw_cdev_send_request *request = buffer;
+
+	switch (request->tcode) {
+	case TCODE_WRITE_QUADLET_REQUEST:
+	case TCODE_WRITE_BLOCK_REQUEST:
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	/* Security policy: Only allow accesses to Units Space. */
+	if (request->offset < CSR_REGISTER_BASE + CSR_CONFIG_ROM_END)
+		return -EACCES;
+
+	return init_request(client, request, LOCAL_BUS | 0x3f, SCODE_100);
+}
+
+static int ioctl_send_stream_packet(struct client *client, void *buffer)
+{
+	struct fw_cdev_send_stream_packet *p = buffer;
+	struct fw_cdev_send_request request;
+	int dest;
+
+	if (p->speed > client->device->card->link_speed ||
+	    p->length > 1024 << p->speed)
+		return -EIO;
+
+	if (p->tag > 3 || p->channel > 63 || p->sy > 15)
+		return -EINVAL;
+
+	dest = fw_stream_packet_destination_id(p->tag, p->channel, p->sy);
+	request.tcode		= TCODE_STREAM_DATA;
+	request.length		= p->length;
+	request.closure		= p->closure;
+	request.data		= p->data;
+	request.generation	= p->generation;
+
+	return init_request(client, &request, dest, p->speed);
+}
+
+static int (* const ioctl_handlers[])(struct client *client, void *buffer) = {
+	ioctl_get_info,
+	ioctl_send_request,
+	ioctl_allocate,
+	ioctl_deallocate,
+	ioctl_send_response,
+	ioctl_initiate_bus_reset,
+	ioctl_add_descriptor,
+	ioctl_remove_descriptor,
+	ioctl_create_iso_context,
+	ioctl_queue_iso,
+	ioctl_start_iso,
+	ioctl_stop_iso,
+	ioctl_get_cycle_timer,
+	ioctl_allocate_iso_resource,
+	ioctl_deallocate_iso_resource,
+	ioctl_allocate_iso_resource_once,
+	ioctl_deallocate_iso_resource_once,
+	ioctl_get_speed,
+	ioctl_send_broadcast_request,
+	ioctl_send_stream_packet,
+};
+
+static int dispatch_ioctl(struct client *client,
+			  unsigned int cmd, void __user *arg)
+{
+	char buffer[256];
+	int ret;
+
+	if (_IOC_TYPE(cmd) != '#' ||
+	    _IOC_NR(cmd) >= ARRAY_SIZE(ioctl_handlers))
+		return -EINVAL;
+
+	if (_IOC_DIR(cmd) & _IOC_WRITE) {
+		if (_IOC_SIZE(cmd) > sizeof(buffer) ||
+		    copy_from_user(buffer, arg, _IOC_SIZE(cmd)))
+			return -EFAULT;
+	}
+
+	ret = ioctl_handlers[_IOC_NR(cmd)](client, buffer);
+	if (ret < 0)
+		return ret;
+
+	if (_IOC_DIR(cmd) & _IOC_READ) {
+		if (_IOC_SIZE(cmd) > sizeof(buffer) ||
+		    copy_to_user(arg, buffer, _IOC_SIZE(cmd)))
+			return -EFAULT;
+	}
+
+	return ret;
+}
+
+static long fw_device_op_ioctl(struct file *file,
+			       unsigned int cmd, unsigned long arg)
+{
+	struct client *client = file->private_data;
+
+	if (fw_device_is_shutdown(client->device))
+		return -ENODEV;
+
+	return dispatch_ioctl(client, cmd, (void __user *) arg);
+}
+
+#ifdef CONFIG_COMPAT
+static long fw_device_op_compat_ioctl(struct file *file,
+				      unsigned int cmd, unsigned long arg)
+{
+	struct client *client = file->private_data;
+
+	if (fw_device_is_shutdown(client->device))
+		return -ENODEV;
+
+	return dispatch_ioctl(client, cmd, compat_ptr(arg));
+}
+#endif
+
+static int fw_device_op_mmap(struct file *file, struct vm_area_struct *vma)
+{
+	struct client *client = file->private_data;
+	enum dma_data_direction direction;
+	unsigned long size;
+	int page_count, ret;
+
+	if (fw_device_is_shutdown(client->device))
+		return -ENODEV;
+
+	/* FIXME: We could support multiple buffers, but we don't. */
+	if (client->buffer.pages != NULL)
+		return -EBUSY;
+
+	if (!(vma->vm_flags & VM_SHARED))
+		return -EINVAL;
+
+	if (vma->vm_start & ~PAGE_MASK)
+		return -EINVAL;
+
+	client->vm_start = vma->vm_start;
+	size = vma->vm_end - vma->vm_start;
+	page_count = size >> PAGE_SHIFT;
+	if (size & ~PAGE_MASK)
+		return -EINVAL;
+
+	if (vma->vm_flags & VM_WRITE)
+		direction = DMA_TO_DEVICE;
+	else
+		direction = DMA_FROM_DEVICE;
+
+	ret = fw_iso_buffer_init(&client->buffer, client->device->card,
+				 page_count, direction);
+	if (ret < 0)
+		return ret;
+
+	ret = fw_iso_buffer_map(&client->buffer, vma);
+	if (ret < 0)
+		fw_iso_buffer_destroy(&client->buffer, client->device->card);
+
+	return ret;
+}
+
+static int shutdown_resource(int id, void *p, void *data)
+{
+	struct client_resource *r = p;
+	struct client *client = data;
+
+	r->release(client, r);
+	client_put(client);
+
+	return 0;
+}
+
+static int fw_device_op_release(struct inode *inode, struct file *file)
+{
+	struct client *client = file->private_data;
+	struct event *e, *next_e;
+
+	mutex_lock(&client->device->client_list_mutex);
+	list_del(&client->link);
+	mutex_unlock(&client->device->client_list_mutex);
+
+	if (client->iso_context)
+		fw_iso_context_destroy(client->iso_context);
+
+	if (client->buffer.pages)
+		fw_iso_buffer_destroy(&client->buffer, client->device->card);
+
+	/* Freeze client->resource_idr and client->event_list */
+	spin_lock_irq(&client->lock);
+	client->in_shutdown = true;
+	spin_unlock_irq(&client->lock);
+
+	idr_for_each(&client->resource_idr, shutdown_resource, client);
+	idr_remove_all(&client->resource_idr);
+	idr_destroy(&client->resource_idr);
+
+	list_for_each_entry_safe(e, next_e, &client->event_list, link)
+		kfree(e);
+
+	client_put(client);
+
+	return 0;
+}
+
+static unsigned int fw_device_op_poll(struct file *file, poll_table * pt)
+{
+	struct client *client = file->private_data;
+	unsigned int mask = 0;
+
+	poll_wait(file, &client->wait, pt);
+
+	if (fw_device_is_shutdown(client->device))
+		mask |= POLLHUP | POLLERR;
+	if (!list_empty(&client->event_list))
+		mask |= POLLIN | POLLRDNORM;
+
+	return mask;
+}
+
+const struct file_operations fw_device_ops = {
+	.owner		= THIS_MODULE,
+	.open		= fw_device_op_open,
+	.read		= fw_device_op_read,
+	.unlocked_ioctl	= fw_device_op_ioctl,
+	.poll		= fw_device_op_poll,
+	.release	= fw_device_op_release,
+	.mmap		= fw_device_op_mmap,
+
+#ifdef CONFIG_COMPAT
+	.compat_ioctl	= fw_device_op_compat_ioctl,
+#endif
+};