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    Subject[PATCH 3/6] firewire: char device interface
    Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
    ---
    drivers/firewire/fw-cdev.c | 954 ++++++++++++++++++++++++++++++++++
    include/linux/firewire-cdev.h | 268 +++++++++
    2 files changed, 1222 insertions(+)

    Index: linux_juju/include/linux/firewire-cdev.h
    ===================================================================
    --- /dev/null
    +++ linux_juju/include/linux/firewire-cdev.h
    @@ -0,0 +1,268 @@
    +/* -*- c-basic-offset: 8 -*-
    + *
    + * fw-device-cdev.h -- Char device interface.
    + *
    + * Copyright (C) 2005-2006 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.
    + */
    +
    +#ifndef __fw_cdev_h
    +#define __fw_cdev_h
    +
    +#include <asm/ioctl.h>
    +#include <asm/types.h>
    +
    +#define TCODE_WRITE_QUADLET_REQUEST 0
    +#define TCODE_WRITE_BLOCK_REQUEST 1
    +#define TCODE_WRITE_RESPONSE 2
    +#define TCODE_READ_QUADLET_REQUEST 4
    +#define TCODE_READ_BLOCK_REQUEST 5
    +#define TCODE_READ_QUADLET_RESPONSE 6
    +#define TCODE_READ_BLOCK_RESPONSE 7
    +#define TCODE_CYCLE_START 8
    +#define TCODE_LOCK_REQUEST 9
    +#define TCODE_STREAM_DATA 10
    +#define TCODE_LOCK_RESPONSE 11
    +
    +#define TCODE_LOCK_MASK_SWAP 0x11
    +#define TCODE_LOCK_COMPARE_SWAP 0x12
    +#define TCODE_LOCK_FETCH_ADD 0x13
    +#define TCODE_LOCK_LITTLE_ADD 0x14
    +#define TCODE_LOCK_BOUNDED_ADD 0x15
    +#define TCODE_LOCK_WRAP_ADD 0x16
    +#define TCODE_LOCK_VENDOR_DEPENDENT 0x17
    +
    +#define RCODE_COMPLETE 0x0
    +#define RCODE_CONFLICT_ERROR 0x4
    +#define RCODE_DATA_ERROR 0x5
    +#define RCODE_TYPE_ERROR 0x6
    +#define RCODE_ADDRESS_ERROR 0x7
    +
    +#define RCODE_SEND_ERROR 0x10
    +#define RCODE_CANCELLED 0x11
    +#define RCODE_BUSY 0x12
    +#define RCODE_GENERATION 0x13
    +#define RCODE_NO_ACK 0x14
    +
    +#define SCODE_100 0x0
    +#define SCODE_200 0x1
    +#define SCODE_400 0x2
    +#define SCODE_800 0x3
    +#define SCODE_1600 0x4
    +#define SCODE_3200 0x5
    +
    +#define FW_CDEV_EVENT_BUS_RESET 0x00
    +#define FW_CDEV_EVENT_RESPONSE 0x01
    +#define FW_CDEV_EVENT_REQUEST 0x02
    +#define FW_CDEV_EVENT_ISO_INTERRUPT 0x03
    +
    +/* The 'closure' fields are for user space to use. Data passed in the
    + * 'closure' field for a request will be returned in the corresponding
    + * event. It's a 64-bit type so that it's a fixed size type big
    + * enough to hold a pointer on all platforms. */
    +
    +struct fw_cdev_event_common {
    + __u64 closure;
    + __u32 type;
    +};
    +
    +struct fw_cdev_event_bus_reset {
    + __u64 closure;
    + __u32 type;
    + __u32 node_id;
    + __u32 local_node_id;
    + __u32 bm_node_id;
    + __u32 irm_node_id;
    + __u32 root_node_id;
    + __u32 generation;
    +};
    +
    +struct fw_cdev_event_response {
    + __u64 closure;
    + __u32 type;
    + __u32 rcode;
    + __u32 length;
    + __u32 data[0];
    +};
    +
    +struct fw_cdev_event_request {
    + __u64 closure;
    + __u32 type;
    + __u32 tcode;
    + __u64 offset;
    + __u32 handle;
    + __u32 length;
    + __u32 data[0];
    +};
    +
    +struct fw_cdev_event_iso_interrupt {
    + __u64 closure;
    + __u32 type;
    + __u32 cycle;
    + __u32 header_length; /* Length in bytes of following headers. */
    + __u32 header[0];
    +};
    +
    +union fw_cdev_event {
    + struct fw_cdev_event_common common;
    + struct fw_cdev_event_bus_reset bus_reset;
    + struct fw_cdev_event_response response;
    + struct fw_cdev_event_request request;
    + struct fw_cdev_event_iso_interrupt iso_interrupt;
    +};
    +
    +#define FW_CDEV_IOC_GET_INFO _IOWR('#', 0x00, struct fw_cdev_get_info)
    +#define FW_CDEV_IOC_SEND_REQUEST _IOW('#', 0x01, struct fw_cdev_send_request)
    +#define FW_CDEV_IOC_ALLOCATE _IOWR('#', 0x02, struct fw_cdev_allocate)
    +#define FW_CDEV_IOC_DEALLOCATE _IOW('#', 0x03, struct fw_cdev_deallocate)
    +#define FW_CDEV_IOC_SEND_RESPONSE _IOW('#', 0x04, struct fw_cdev_send_response)
    +#define FW_CDEV_IOC_INITIATE_BUS_RESET _IOW('#', 0x05, struct fw_cdev_initiate_bus_reset)
    +#define FW_CDEV_IOC_ADD_DESCRIPTOR _IOWR('#', 0x06, struct fw_cdev_add_descriptor)
    +#define FW_CDEV_IOC_REMOVE_DESCRIPTOR _IOW('#', 0x07, struct fw_cdev_remove_descriptor)
    +
    +#define FW_CDEV_IOC_CREATE_ISO_CONTEXT _IOWR('#', 0x08, struct fw_cdev_create_iso_context)
    +#define FW_CDEV_IOC_QUEUE_ISO _IOWR('#', 0x09, struct fw_cdev_queue_iso)
    +#define FW_CDEV_IOC_START_ISO _IOW('#', 0x0a, struct fw_cdev_start_iso)
    +#define FW_CDEV_IOC_STOP_ISO _IOW('#', 0x0b, struct fw_cdev_stop_iso)
    +
    +/* FW_CDEV_VERSION History
    + *
    + * 1 Feb 18, 2007: Initial version.
    + */
    +#define FW_CDEV_VERSION 1
    +
    +struct fw_cdev_get_info {
    + /* The version field is just a running serial number. We
    + * never break backwards compatibility. Userspace passes in
    + * the version it expects and the kernel passes back the
    + * highest version it can provide. Even if the structs in
    + * this interface are extended in a later version, the kernel
    + * will not copy back more data than what was present in the
    + * interface version userspace expects. */
    + __u32 version;
    +
    + /* If non-zero, at most rom_length bytes of config rom will be
    + * copied into that user space address. In either case,
    + * rom_length is updated with the actual length of the config
    + * rom. */
    + __u32 rom_length;
    + __u64 rom;
    +
    + /* If non-zero, a fw_cdev_event_bus_reset struct will be
    + * copied here with the current state of the bus. This does
    + * not cause a bus reset to happen. The value of closure in
    + * this and sub-sequent bus reset events is set to
    + * bus_reset_closure. */
    + __u64 bus_reset;
    + __u64 bus_reset_closure;
    +
    + /* The index of the card this devices belongs to. */
    + __u32 card;
    +};
    +
    +struct fw_cdev_send_request {
    + __u32 tcode;
    + __u32 length;
    + __u64 offset;
    + __u64 closure;
    + __u64 data;
    + __u32 generation;
    +};
    +
    +struct fw_cdev_send_response {
    + __u32 rcode;
    + __u32 length;
    + __u64 data;
    + __u32 handle;
    +};
    +
    +struct fw_cdev_allocate {
    + __u64 offset;
    + __u64 closure;
    + __u32 length;
    + __u32 handle;
    +};
    +
    +struct fw_cdev_deallocate {
    + __u32 handle;
    +};
    +
    +#define FW_CDEV_LONG_RESET 0
    +#define FW_CDEV_SHORT_RESET 1
    +
    +struct fw_cdev_initiate_bus_reset {
    + __u32 type;
    +};
    +
    +struct fw_cdev_add_descriptor {
    + __u32 immediate;
    + __u32 key;
    + __u64 data;
    + __u32 length;
    + __u32 handle;
    +};
    +
    +struct fw_cdev_remove_descriptor {
    + __u32 handle;
    +};
    +
    +#define FW_CDEV_ISO_CONTEXT_TRANSMIT 0
    +#define FW_CDEV_ISO_CONTEXT_RECEIVE 1
    +
    +#define FW_CDEV_ISO_CONTEXT_MATCH_TAG0 1
    +#define FW_CDEV_ISO_CONTEXT_MATCH_TAG1 2
    +#define FW_CDEV_ISO_CONTEXT_MATCH_TAG2 4
    +#define FW_CDEV_ISO_CONTEXT_MATCH_TAG3 8
    +#define FW_CDEV_ISO_CONTEXT_MATCH_ALL_TAGS 15
    +
    +struct fw_cdev_create_iso_context {
    + __u32 type;
    + __u32 header_size;
    + __u32 channel;
    + __u32 speed;
    + __u64 closure;
    + __u32 handle;
    +};
    +
    +struct fw_cdev_iso_packet {
    + __u16 payload_length; /* Length of indirect payload. */
    + __u32 interrupt : 1; /* Generate interrupt on this packet */
    + __u32 skip : 1; /* Set to not send packet at all. */
    + __u32 tag : 2;
    + __u32 sy : 4;
    + __u32 header_length : 8; /* Length of immediate header. */
    + __u32 header[0];
    +};
    +
    +struct fw_cdev_queue_iso {
    + __u64 packets;
    + __u64 data;
    + __u32 size;
    + __u32 handle;
    +};
    +
    +struct fw_cdev_start_iso {
    + __s32 cycle;
    + __u32 sync;
    + __u32 tags;
    + __u32 handle;
    +};
    +
    +struct fw_cdev_stop_iso {
    + __u32 handle;
    +};
    +
    +#endif /* __fw_cdev_h */
    Index: linux_juju/drivers/firewire/fw-cdev.c
    ===================================================================
    --- /dev/null
    +++ linux_juju/drivers/firewire/fw-cdev.c
    @@ -0,0 +1,954 @@
    +/* -*- c-basic-offset: 8 -*-
    + *
    + * fw-device-cdev.c - Char device for device raw access
    + *
    + * Copyright (C) 2005-2006 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"
    +
    +/* dequeue_event() just kfree()'s the event, so the event has to be
    + * the first field in the struct. */
    +
    +struct client;
    +struct client_resource {
    + struct list_head link;
    + void (*release)(struct client *client, struct client_resource *r);
    + u32 handle;
    +};
    +
    +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
    +};
    --
    Stefan Richter
    -=====-=-=== -=-= ---=-
    http://arcgraph.de/sr/
    -
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      Last update: 2007-05-02 14:23    [W:0.093 / U:2.840 seconds]
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