/*
* 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_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;
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);
}
/* caller must hold card->lock so that node pointers can be dereferenced here */
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->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;
}
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;
struct fw_card *card = client->device->card;
unsigned long ret = 0;
client->version = get_info->version;
get_info->version = FW_CDEV_VERSION;
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);
unsigned long flags;
spin_lock_irqsave(&card->lock, flags);
fill_bus_reset_event(&bus_reset, client);
spin_unlock_irqrestore(&card->lock, flags);
if (copy_to_user(uptr, &bus_reset, sizeof(bus_reset)))
return -EFAULT;
}
get_info->card = 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;
struct fw_cdev_event_response *r = &response->response;
if (length < r->length)
r->length = length;
if (rcode == RCODE_COMPLETE)
memcpy(r->data, payload, r->length);
spin_lock_irqsave(&client->lock, flags);
list_del(&response->resource.link);
spin_unlock_irqrestore(&client->lock, flags);
r->type = FW_CDEV_EVENT_RESPONSE;
r->rcode = rcode;
/*
* In the case that sizeof(*r) 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 (r->length <= sizeof(*r) - offsetof(typeof(*r), data))
queue_event(client, &response->event, r, sizeof(*r),
r->data, r->length);
else
queue_event(client, &response->event, r, sizeof(*r) + r->length,
NULL, 0);
}
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, ®ion) < 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;
/* 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 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 retval;
}
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, retval;
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;
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
};