summaryrefslogtreecommitdiffstats
path: root/drivers/firewire/fw-cdev.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/firewire/fw-cdev.c')
-rw-r--r--drivers/firewire/fw-cdev.c961
1 files changed, 961 insertions, 0 deletions
diff --git a/drivers/firewire/fw-cdev.c b/drivers/firewire/fw-cdev.c
new file mode 100644
index 000000000000..0fa5bd54c6a1
--- /dev/null
+++ b/drivers/firewire/fw-cdev.c
@@ -0,0 +1,961 @@
+/*
+ * 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/module.h>
+#include <linux/kernel.h>
+#include <linux/wait.h>
+#include <linux/errno.h>
+#include <linux/device.h>
+#include <linux/vmalloc.h>
+#include <linux/poll.h>
+#include <linux/delay.h>
+#include <linux/mm.h>
+#include <linux/idr.h>
+#include <linux/compat.h>
+#include <linux/firewire-cdev.h>
+#include <asm/uaccess.h>
+#include "fw-transaction.h"
+#include "fw-topology.h"
+#include "fw-device.h"
+
+struct client;
+struct client_resource {
+ struct list_head link;
+ void (*release)(struct client *client, struct client_resource *r);
+ u32 handle;
+};
+
+/*
+ * dequeue_event() just kfree()'s the event, so the event has to be
+ * the first field in the struct.
+ */
+
+struct event {
+ struct { void *data; size_t size; } v[2];
+ struct list_head link;
+};
+
+struct bus_reset {
+ struct event event;
+ struct fw_cdev_event_bus_reset reset;
+};
+
+struct response {
+ struct event event;
+ struct fw_transaction transaction;
+ struct client *client;
+ struct client_resource resource;
+ struct fw_cdev_event_response response;
+};
+
+struct iso_interrupt {
+ struct event event;
+ struct fw_cdev_event_iso_interrupt interrupt;
+};
+
+struct client {
+ u32 version;
+ struct fw_device *device;
+ spinlock_t lock;
+ u32 resource_handle;
+ struct list_head resource_list;
+ 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;
+};
+
+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;
+ unsigned long flags;
+
+ device = fw_device_from_devt(inode->i_rdev);
+ if (device == NULL)
+ return -ENODEV;
+
+ client = kzalloc(sizeof(*client), GFP_KERNEL);
+ if (client == NULL)
+ return -ENOMEM;
+
+ client->device = fw_device_get(device);
+ INIT_LIST_HEAD(&client->event_list);
+ INIT_LIST_HEAD(&client->resource_list);
+ spin_lock_init(&client->lock);
+ init_waitqueue_head(&client->wait);
+
+ file->private_data = client;
+
+ spin_lock_irqsave(&device->card->lock, flags);
+ list_add_tail(&client->link, &device->client_list);
+ spin_unlock_irqrestore(&device->card->lock, flags);
+
+ 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);
+
+ list_add_tail(&event->link, &client->event_list);
+ wake_up_interruptible(&client->wait);
+
+ spin_unlock_irqrestore(&client->lock, flags);
+}
+
+static int
+dequeue_event(struct client *client, char __user *buffer, size_t count)
+{
+ unsigned long flags;
+ struct event *event;
+ size_t size, total;
+ int i, retval;
+
+ retval = wait_event_interruptible(client->wait,
+ !list_empty(&client->event_list) ||
+ fw_device_is_shutdown(client->device));
+ if (retval < 0)
+ return retval;
+
+ if (list_empty(&client->event_list) &&
+ fw_device_is_shutdown(client->device))
+ return -ENODEV;
+
+ spin_lock_irqsave(&client->lock, flags);
+ event = container_of(client->event_list.next, struct event, link);
+ list_del(&event->link);
+ spin_unlock_irqrestore(&client->lock, flags);
+
+ 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)) {
+ retval = -EFAULT;
+ goto out;
+ }
+ total += size;
+ }
+ retval = total;
+
+ out:
+ kfree(event);
+
+ return retval;
+}
+
+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;
+
+ event->closure = client->bus_reset_closure;
+ event->type = FW_CDEV_EVENT_BUS_RESET;
+ 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;
+ event->generation = card->generation;
+}
+
+static void
+for_each_client(struct fw_device *device,
+ void (*callback)(struct client *client))
+{
+ struct fw_card *card = device->card;
+ struct client *c;
+ unsigned long flags;
+
+ spin_lock_irqsave(&card->lock, flags);
+
+ list_for_each_entry(c, &device->client_list, link)
+ callback(c);
+
+ spin_unlock_irqrestore(&card->lock, flags);
+}
+
+static void
+queue_bus_reset_event(struct client *client)
+{
+ struct bus_reset *bus_reset;
+
+ bus_reset = kzalloc(sizeof(*bus_reset), GFP_ATOMIC);
+ if (bus_reset == NULL) {
+ fw_notify("Out of memory when allocating bus reset event\n");
+ return;
+ }
+
+ fill_bus_reset_event(&bus_reset->reset, client);
+
+ queue_event(client, &bus_reset->event,
+ &bus_reset->reset, sizeof(bus_reset->reset), NULL, 0);
+}
+
+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;
+
+ client->version = get_info->version;
+ get_info->version = FW_CDEV_VERSION;
+
+ 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;
+
+ if (copy_to_user(uptr, client->device->config_rom,
+ min(want, have)))
+ return -EFAULT;
+ }
+ get_info->rom_length = client->device->config_rom_length * 4;
+
+ 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;
+ }
+
+ get_info->card = client->device->card->index;
+
+ return 0;
+}
+
+static void
+add_client_resource(struct client *client, struct client_resource *resource)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&client->lock, flags);
+ list_add_tail(&resource->link, &client->resource_list);
+ resource->handle = client->resource_handle++;
+ spin_unlock_irqrestore(&client->lock, flags);
+}
+
+static int
+release_client_resource(struct client *client, u32 handle,
+ struct client_resource **resource)
+{
+ struct client_resource *r;
+ unsigned long flags;
+
+ spin_lock_irqsave(&client->lock, flags);
+ list_for_each_entry(r, &client->resource_list, link) {
+ if (r->handle == handle) {
+ list_del(&r->link);
+ break;
+ }
+ }
+ spin_unlock_irqrestore(&client->lock, flags);
+
+ if (&r->link == &client->resource_list)
+ return -EINVAL;
+
+ if (resource)
+ *resource = r;
+ else
+ r->release(client, r);
+
+ return 0;
+}
+
+static void
+release_transaction(struct client *client, struct client_resource *resource)
+{
+ struct response *response =
+ container_of(resource, struct response, resource);
+
+ fw_cancel_transaction(client->device->card, &response->transaction);
+}
+
+static void
+complete_transaction(struct fw_card *card, int rcode,
+ void *payload, size_t length, void *data)
+{
+ struct response *response = data;
+ struct client *client = response->client;
+ unsigned long flags;
+
+ if (length < response->response.length)
+ response->response.length = length;
+ if (rcode == RCODE_COMPLETE)
+ memcpy(response->response.data, payload,
+ response->response.length);
+
+ spin_lock_irqsave(&client->lock, flags);
+ list_del(&response->resource.link);
+ spin_unlock_irqrestore(&client->lock, flags);
+
+ response->response.type = FW_CDEV_EVENT_RESPONSE;
+ response->response.rcode = rcode;
+ queue_event(client, &response->event,
+ &response->response, sizeof(response->response),
+ response->response.data, response->response.length);
+}
+
+static ssize_t ioctl_send_request(struct client *client, void *buffer)
+{
+ struct fw_device *device = client->device;
+ struct fw_cdev_send_request *request = buffer;
+ struct response *response;
+
+ /* What is the biggest size we'll accept, really? */
+ if (request->length > 4096)
+ return -EINVAL;
+
+ response = kmalloc(sizeof(*response) + request->length, GFP_KERNEL);
+ if (response == NULL)
+ return -ENOMEM;
+
+ response->client = client;
+ response->response.length = request->length;
+ response->response.closure = request->closure;
+
+ if (request->data &&
+ copy_from_user(response->response.data,
+ u64_to_uptr(request->data), request->length)) {
+ kfree(response);
+ return -EFAULT;
+ }
+
+ response->resource.release = release_transaction;
+ add_client_resource(client, &response->resource);
+
+ fw_send_request(device->card, &response->transaction,
+ request->tcode & 0x1f,
+ device->node->node_id,
+ request->generation,
+ device->node->max_speed,
+ request->offset,
+ response->response.data, request->length,
+ complete_transaction, response);
+
+ if (request->data)
+ return sizeof(request) + request->length;
+ else
+ return sizeof(request);
+}
+
+struct address_handler {
+ struct fw_address_handler handler;
+ __u64 closure;
+ struct client *client;
+ struct client_resource resource;
+};
+
+struct request {
+ struct fw_request *request;
+ void *data;
+ size_t length;
+ struct client_resource resource;
+};
+
+struct request_event {
+ struct event event;
+ struct fw_cdev_event_request request;
+};
+
+static void
+release_request(struct client *client, struct client_resource *resource)
+{
+ struct request *request =
+ container_of(resource, struct request, resource);
+
+ fw_send_response(client->device->card, request->request,
+ RCODE_CONFLICT_ERROR);
+ kfree(request);
+}
+
+static void
+handle_request(struct fw_card *card, struct fw_request *r,
+ 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 *handler = callback_data;
+ struct request *request;
+ struct request_event *e;
+ struct client *client = handler->client;
+
+ request = kmalloc(sizeof(*request), GFP_ATOMIC);
+ e = kmalloc(sizeof(*e), GFP_ATOMIC);
+ if (request == NULL || e == NULL) {
+ kfree(request);
+ kfree(e);
+ fw_send_response(card, r, RCODE_CONFLICT_ERROR);
+ return;
+ }
+
+ request->request = r;
+ request->data = payload;
+ request->length = length;
+
+ request->resource.release = release_request;
+ add_client_resource(client, &request->resource);
+
+ e->request.type = FW_CDEV_EVENT_REQUEST;
+ e->request.tcode = tcode;
+ e->request.offset = offset;
+ e->request.length = length;
+ e->request.handle = request->resource.handle;
+ e->request.closure = handler->closure;
+
+ queue_event(client, &e->event,
+ &e->request, sizeof(e->request), payload, length);
+}
+
+static void
+release_address_handler(struct client *client,
+ struct client_resource *resource)
+{
+ struct address_handler *handler =
+ container_of(resource, struct address_handler, resource);
+
+ fw_core_remove_address_handler(&handler->handler);
+ kfree(handler);
+}
+
+static int ioctl_allocate(struct client *client, void *buffer)
+{
+ struct fw_cdev_allocate *request = buffer;
+ struct address_handler *handler;
+ struct fw_address_region region;
+
+ handler = kmalloc(sizeof(*handler), GFP_KERNEL);
+ if (handler == NULL)
+ return -ENOMEM;
+
+ region.start = request->offset;
+ region.end = request->offset + request->length;
+ handler->handler.length = request->length;
+ handler->handler.address_callback = handle_request;
+ handler->handler.callback_data = handler;
+ handler->closure = request->closure;
+ handler->client = client;
+
+ if (fw_core_add_address_handler(&handler->handler, &region) < 0) {
+ kfree(handler);
+ return -EBUSY;
+ }
+
+ handler->resource.release = release_address_handler;
+ add_client_resource(client, &handler->resource);
+ request->handle = handler->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, NULL);
+}
+
+static int ioctl_send_response(struct client *client, void *buffer)
+{
+ struct fw_cdev_send_response *request = buffer;
+ struct client_resource *resource;
+ struct request *r;
+
+ if (release_client_resource(client, request->handle, &resource) < 0)
+ return -EINVAL;
+ r = container_of(resource, struct request, 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);
+}
+
+struct descriptor {
+ struct fw_descriptor d;
+ struct client_resource resource;
+ u32 data[0];
+};
+
+static void release_descriptor(struct client *client,
+ struct client_resource *resource)
+{
+ struct descriptor *descriptor =
+ container_of(resource, struct descriptor, resource);
+
+ fw_core_remove_descriptor(&descriptor->d);
+ kfree(descriptor);
+}
+
+static int ioctl_add_descriptor(struct client *client, void *buffer)
+{
+ struct fw_cdev_add_descriptor *request = buffer;
+ struct descriptor *descriptor;
+ int retval;
+
+ if (request->length > 256)
+ return -EINVAL;
+
+ descriptor =
+ kmalloc(sizeof(*descriptor) + request->length * 4, GFP_KERNEL);
+ if (descriptor == NULL)
+ return -ENOMEM;
+
+ if (copy_from_user(descriptor->data,
+ u64_to_uptr(request->data), request->length * 4)) {
+ kfree(descriptor);
+ return -EFAULT;
+ }
+
+ descriptor->d.length = request->length;
+ descriptor->d.immediate = request->immediate;
+ descriptor->d.key = request->key;
+ descriptor->d.data = descriptor->data;
+
+ retval = fw_core_add_descriptor(&descriptor->d);
+ if (retval < 0) {
+ kfree(descriptor);
+ return retval;
+ }
+
+ descriptor->resource.release = release_descriptor;
+ add_client_resource(client, &descriptor->resource);
+ request->handle = descriptor->resource.handle;
+
+ return 0;
+}
+
+static int ioctl_remove_descriptor(struct client *client, void *buffer)
+{
+ struct fw_cdev_remove_descriptor *request = buffer;
+
+ return release_client_resource(client, request->handle, 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 *interrupt;
+
+ interrupt = kzalloc(sizeof(*interrupt) + header_length, GFP_ATOMIC);
+ if (interrupt == NULL)
+ return;
+
+ interrupt->interrupt.type = FW_CDEV_EVENT_ISO_INTERRUPT;
+ interrupt->interrupt.closure = client->iso_closure;
+ interrupt->interrupt.cycle = cycle;
+ interrupt->interrupt.header_length = header_length;
+ memcpy(interrupt->interrupt.header, header, header_length);
+ queue_event(client, &interrupt->event,
+ &interrupt->interrupt,
+ sizeof(interrupt->interrupt) + header_length, NULL, 0);
+}
+
+static int ioctl_create_iso_context(struct client *client, void *buffer)
+{
+ struct fw_cdev_create_iso_context *request = buffer;
+
+ 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;
+ }
+
+ client->iso_closure = request->closure;
+ client->iso_context = fw_iso_context_create(client->device->card,
+ request->type,
+ request->channel,
+ request->speed,
+ request->header_size,
+ iso_callback, client);
+ if (IS_ERR(client->iso_context))
+ return PTR_ERR(client->iso_context);
+
+ /* We only support one context at this time. */
+ request->handle = 0;
+
+ return 0;
+}
+
+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;
+ 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;
+ }
+
+ if (!access_ok(VERIFY_READ, request->packets, request->size))
+ return -EFAULT;
+
+ p = (struct fw_cdev_iso_packet __user *)u64_to_uptr(request->packets);
+ end = (void __user *)p + request->size;
+ count = 0;
+ while (p < end) {
+ if (__copy_from_user(&u.packet, p, sizeof(*p)))
+ return -EFAULT;
+
+ 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 (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 (request->handle != 0)
+ return -EINVAL;
+
+ return fw_iso_context_stop(client->iso_context);
+}
+
+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,
+};
+
+static int
+dispatch_ioctl(struct client *client, unsigned int cmd, void __user *arg)
+{
+ char buffer[256];
+ int retval;
+
+ 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;
+ }
+
+ retval = ioctl_handlers[_IOC_NR(cmd)](client, buffer);
+ if (retval < 0)
+ return retval;
+
+ if (_IOC_DIR(cmd) & _IOC_READ) {
+ if (_IOC_SIZE(cmd) > sizeof(buffer) ||
+ copy_to_user(arg, buffer, _IOC_SIZE(cmd)))
+ return -EFAULT;
+ }
+
+ return 0;
+}
+
+static long
+fw_device_op_ioctl(struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ struct client *client = file->private_data;
+
+ 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;
+
+ 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, retval;
+
+ /* 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;
+
+ retval = fw_iso_buffer_init(&client->buffer, client->device->card,
+ page_count, direction);
+ if (retval < 0)
+ return retval;
+
+ retval = fw_iso_buffer_map(&client->buffer, vma);
+ if (retval < 0)
+ fw_iso_buffer_destroy(&client->buffer, client->device->card);
+
+ return retval;
+}
+
+static int fw_device_op_release(struct inode *inode, struct file *file)
+{
+ struct client *client = file->private_data;
+ struct event *e, *next_e;
+ struct client_resource *r, *next_r;
+ unsigned long flags;
+
+ if (client->buffer.pages)
+ fw_iso_buffer_destroy(&client->buffer, client->device->card);
+
+ if (client->iso_context)
+ fw_iso_context_destroy(client->iso_context);
+
+ list_for_each_entry_safe(r, next_r, &client->resource_list, link)
+ r->release(client, r);
+
+ /*
+ * FIXME: We should wait for the async tasklets to stop
+ * running before freeing the memory.
+ */
+
+ list_for_each_entry_safe(e, next_e, &client->event_list, link)
+ kfree(e);
+
+ spin_lock_irqsave(&client->device->card->lock, flags);
+ list_del(&client->link);
+ spin_unlock_irqrestore(&client->device->card->lock, flags);
+
+ fw_device_put(client->device);
+ kfree(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
+};