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fw-cdev.c

/*
 * 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/preempt.h>
#include <linux/time.h>
#include <linux/delay.h>
#include <linux/mm.h>
#include <linux/idr.h>
#include <linux/compat.h>
#include <linux/firewire-cdev.h>
#include <asm/system.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);
      spin_unlock_irqrestore(&client->lock, flags);

      wake_up_interruptible(&client->wait);
}

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 int 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->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 *irq;

      irq = kzalloc(sizeof(*irq) + header_length, GFP_ATOMIC);
      if (irq == NULL)
            return;

      irq->interrupt.type      = FW_CDEV_EVENT_ISO_INTERRUPT;
      irq->interrupt.closure   = client->iso_closure;
      irq->interrupt.cycle     = cycle;
      irq->interrupt.header_length = header_length;
      memcpy(irq->interrupt.header, header, header_length);
      queue_event(client, &irq->event, &irq->interrupt,
                sizeof(irq->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;

      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) & 0x02)
#define GET_SY(v)       (((v) >> 20) & 0x04)
#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 (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 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 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,
};

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
};

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