android_kernel_xiaomi_sm8350/drivers/firewire/fw-cdev.c
David Moore 8401d92ba4 firewire: Preserve response data alignment bug when it is harmless
Recently, a bug having to do with the alignment of transaction response
data was fixed.  However, some apps such as libdc1394 relied on the
presence of that bug in order to function correctly.  In order to stay
compatible with old versions of those apps, this patch preserves the bug
in cases where it is harmless to normal operation (such as the single
quadlet read) due to a simple duplication of data.  This guarantees
maximum compatability for those users who are using the old app with the
fixed kernel.

Signed-off-by: David Moore <dcm@acm.org>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
2008-08-02 20:03:49 +02:00

1050 lines
26 KiB
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_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, &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;
/* 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) & 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 (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 0;
}
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
};