raw1394.c

这个是uClinux下的ieee1394驱动

                        if (copy_from_user(packet->data, int2ptr(req->req.sendb),
                                           req->req.length)) {
                                req->req.error = RAW1394_ERROR_MEMFAULT;
                        }
                }
                req->req.length = 0;
                break;

        case RAW1394_REQ_LOCK:
                if ((req->req.misc == EXTCODE_FETCH_ADD)
                    || (req->req.misc == EXTCODE_LITTLE_ADD)) {
                        if (req->req.length != 4) {
                                req->req.error = RAW1394_ERROR_INVALID_ARG;
                                break;
                        }
                } else {
                        if (req->req.length != 8) {
                                req->req.error = RAW1394_ERROR_INVALID_ARG;
                                break;
                        }
                }

                packet = hpsb_make_lockpacket(fi->host, node, addr,
                                              req->req.misc);
                if (!packet) return -ENOMEM;

                if (copy_from_user(packet->data, int2ptr(req->req.sendb),
                                   req->req.length)) {
                        req->req.error = RAW1394_ERROR_MEMFAULT;
                        break;
                }

                req->data = packet->data;
                req->req.length = 4;
                break;

        case RAW1394_REQ_LOCK64:
        default:
                req->req.error = RAW1394_ERROR_STATE_ORDER;
        }

        req->packet = packet;

        if (req->req.error) {
                req->req.length = 0;
                queue_complete_req(req);
                return sizeof(struct raw1394_request);
        }

        req->tq.data = req;
        hpsb_add_packet_complete_task(packet, &req->tq);

        spin_lock_irq(&fi->reqlists_lock);
        list_add_tail(&req->list, &fi->req_pending);
        spin_unlock_irq(&fi->reqlists_lock);

	packet->generation = req->req.generation;

        if (!hpsb_send_packet(packet)) {
                req->req.error = RAW1394_ERROR_SEND_ERROR;
                req->req.length = 0;
                free_tlabel(packet->host, packet->node_id, packet->tlabel);
                queue_complete_req(req);
        }
        return sizeof(struct raw1394_request);
}

static int handle_iso_send(struct file_info *fi, struct pending_request *req,
                           int channel)
{
        struct hpsb_packet *packet;

        packet = alloc_hpsb_packet(req->req.length);
        if (!packet) return -ENOMEM;
        req->packet = packet;

        fill_iso_packet(packet, req->req.length, channel & 0x3f,
                        (req->req.misc >> 16) & 0x3, req->req.misc & 0xf);
        packet->type = hpsb_iso;
        packet->speed_code = req->req.address & 0x3;
        packet->host = fi->host;

        if (copy_from_user(packet->data, int2ptr(req->req.sendb),
                           req->req.length)) {
                req->req.error = RAW1394_ERROR_MEMFAULT;
                req->req.length = 0;
                queue_complete_req(req);
                return sizeof(struct raw1394_request);
        }

        req->tq.data = req;
        req->tq.routine = (void (*)(void*))queue_complete_req;
        req->req.length = 0;
	hpsb_add_packet_complete_task(packet, &req->tq);

        spin_lock_irq(&fi->reqlists_lock);
        list_add_tail(&req->list, &fi->req_pending);
        spin_unlock_irq(&fi->reqlists_lock);

	/* Update the generation of the packet just before sending. */
	packet->generation = get_hpsb_generation(fi->host);

        if (!hpsb_send_packet(packet)) {
                req->req.error = RAW1394_ERROR_SEND_ERROR;
                queue_complete_req(req);
        }

        return sizeof(struct raw1394_request);
}

static int state_connected(struct file_info *fi, struct pending_request *req)
{
        int node = req->req.address >> 48;

        req->req.error = RAW1394_ERROR_NONE;

        if (req->req.type ==  RAW1394_REQ_ISO_SEND) {
                return handle_iso_send(fi, req, node);
        }

        if (req->req.generation != get_hpsb_generation(fi->host)) {
                req->req.error = RAW1394_ERROR_GENERATION;
                req->req.generation = get_hpsb_generation(fi->host);
                req->req.length = 0;
                queue_complete_req(req);
                return sizeof(struct raw1394_request);
        }

        switch (req->req.type) {
        case RAW1394_REQ_ISO_LISTEN:
                handle_iso_listen(fi, req);
                return sizeof(struct raw1394_request);

        case RAW1394_REQ_FCP_LISTEN:
                handle_fcp_listen(fi, req);
                return sizeof(struct raw1394_request);

        case RAW1394_REQ_RESET_BUS:
                hpsb_reset_bus(fi->host, LONG_RESET);
                return sizeof(struct raw1394_request);
        }

        if (req->req.length == 0) {
                req->req.error = RAW1394_ERROR_INVALID_ARG;
                queue_complete_req(req);
                return sizeof(struct raw1394_request);
        }

        if (fi->host->node_id == node) {
                return handle_local_request(fi, req, node);
        }

        return handle_remote_request(fi, req, node);
}


static ssize_t raw1394_write(struct file *file, const char *buffer, size_t count,
                     loff_t *offset_is_ignored)
{
        struct file_info *fi = (struct file_info *)file->private_data;
        struct pending_request *req;
        ssize_t retval = 0;

        if (count != sizeof(struct raw1394_request)) {
                return -EINVAL;
        }

        req = alloc_pending_request();
        if (req == NULL) {
                return -ENOMEM;
        }
        req->file_info = fi;

        if (copy_from_user(&req->req, buffer, sizeof(struct raw1394_request))) {
                free_pending_request(req);
                return -EFAULT;
        }

        switch (fi->state) {
        case opened:
                retval = state_opened(fi, req);
                break;

        case initialized:
                retval = state_initialized(fi, req);
                break;

        case connected:
                retval = state_connected(fi, req);
                break;
        }

        if (retval < 0) {
                free_pending_request(req);
        }

        return retval;
}

static unsigned int raw1394_poll(struct file *file, poll_table *pt)
{
        struct file_info *fi = file->private_data;
        unsigned int mask = POLLOUT | POLLWRNORM;

        poll_wait(file, &fi->poll_wait_complete, pt);

        spin_lock_irq(&fi->reqlists_lock);
        if (!list_empty(&fi->req_complete)) {
                mask |= POLLIN | POLLRDNORM;
        }
        spin_unlock_irq(&fi->reqlists_lock);

        return mask;
}

static int raw1394_open(struct inode *inode, struct file *file)
{
        struct file_info *fi;

        if (ieee1394_file_to_instance(file) > 0) {
                return -ENXIO;
        }

        fi = kmalloc(sizeof(struct file_info), SLAB_KERNEL);
        if (fi == NULL)
                return -ENOMEM;
        
        memset(fi, 0, sizeof(struct file_info));

        INIT_LIST_HEAD(&fi->list);
        fi->state = opened;
        INIT_LIST_HEAD(&fi->req_pending);
        INIT_LIST_HEAD(&fi->req_complete);
        sema_init(&fi->complete_sem, 0);
        spin_lock_init(&fi->reqlists_lock);
        init_waitqueue_head(&fi->poll_wait_complete);

        file->private_data = fi;

        return 0;
}

static int raw1394_release(struct inode *inode, struct file *file)
{
        struct file_info *fi = file->private_data;
        struct list_head *lh;
        struct pending_request *req;
        int done = 0, i;

        for (i = 0; i < 64; i++) {
                if (fi->listen_channels & (1ULL << i)) {
                        hpsb_unlisten_channel(hl_handle, fi->host, i);
                }
        }

        spin_lock(&host_info_lock);
        fi->listen_channels = 0;
        spin_unlock(&host_info_lock);

        while (!done) {
                spin_lock_irq(&fi->reqlists_lock);

                while (!list_empty(&fi->req_complete)) {
                        lh = fi->req_complete.next;
                        list_del(lh);

                        req = list_entry(lh, struct pending_request, list);

                        free_pending_request(req);
                }

                if (list_empty(&fi->req_pending)) done = 1;

                spin_unlock_irq(&fi->reqlists_lock);

                if (!done) down_interruptible(&fi->complete_sem);
        }

        if (fi->state == connected) {
                spin_lock_irq(&host_info_lock);
                list_del(&fi->list);
                spin_unlock_irq(&host_info_lock);

                hpsb_unref_host(fi->host);
        }

        kfree(fi);

        return 0;
}

static struct hpsb_highlevel_ops hl_ops = {
        .add_host =    add_host,
        .remove_host = remove_host,
        .host_reset =  host_reset,
        .iso_receive = iso_receive,
        .fcp_request = fcp_request,
};

static struct file_operations file_ops = {
	.owner =	THIS_MODULE,
        .read =		raw1394_read, 
        .write =	raw1394_write, 
        .poll =		raw1394_poll, 
        .open =		raw1394_open, 
        .release =	raw1394_release, 
};

static int __init init_raw1394(void)
{
        hl_handle = hpsb_register_highlevel(RAW1394_DEVICE_NAME, &hl_ops);
        if (hl_handle == NULL) {
                HPSB_ERR("raw1394 failed to register with ieee1394 highlevel");
                return -ENOMEM;
        }

	devfs_handle = devfs_register(NULL,
				      RAW1394_DEVICE_NAME, DEVFS_FL_NONE,
                                      IEEE1394_MAJOR,
				      IEEE1394_MINOR_BLOCK_RAW1394 * 16,
                                      S_IFCHR | S_IRUSR | S_IWUSR, &file_ops,
                                      NULL);

        if (ieee1394_register_chardev(IEEE1394_MINOR_BLOCK_RAW1394,
				      THIS_MODULE, &file_ops)) {
                HPSB_ERR("raw1394 failed to register minor device block");
		devfs_unregister(devfs_handle);
		hpsb_unregister_highlevel(hl_handle);
                return -EBUSY;
        }
	printk(KERN_INFO "raw1394: /dev/%s device initialized\n", RAW1394_DEVICE_NAME);
        return 0;
}

static void __exit cleanup_raw1394(void)
{
        ieee1394_unregister_chardev(IEEE1394_MINOR_BLOCK_RAW1394);
	devfs_unregister(devfs_handle);
        hpsb_unregister_highlevel(hl_handle);
}

module_init(init_raw1394);
module_exit(cleanup_raw1394);
MODULE_LICENSE("GPL");