ibmasmfs.c

h内核

	return count;
}

static int event_file_open(struct inode *inode, struct file *file)
{
	struct ibmasmfs_event_data *event_data;
	struct service_processor *sp; 

	if (!inode->u.generic_ip)
		return -ENODEV;

	sp = inode->u.generic_ip;

	event_data = kmalloc(sizeof(struct ibmasmfs_event_data), GFP_KERNEL);
	if (!event_data)
		return -ENOMEM;

	ibmasm_event_reader_register(sp, &event_data->reader);

	event_data->sp = sp;
	file->private_data = event_data;
	return 0;
}

static int event_file_close(struct inode *inode, struct file *file)
{
	struct ibmasmfs_event_data *event_data = file->private_data;

	ibmasm_event_reader_unregister(event_data->sp, &event_data->reader);
	kfree(event_data);
	return 0;
}

static ssize_t event_file_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
{
	struct ibmasmfs_event_data *event_data = file->private_data;
	struct event_reader *reader = &event_data->reader;
	int ret;

	if (*offset < 0)
		return -EINVAL;
	if (count == 0 || count > IBMASM_EVENT_MAX_SIZE)
		return 0;
	if (*offset != 0)
		return 0;

	ret = ibmasm_get_next_event(event_data->sp, reader);
	if (ret <= 0)
		return ret;

	if (count < reader->data_size)
		return -EINVAL;

        if (copy_to_user(buf, reader->data, reader->data_size))
		return -EFAULT;

	return reader->data_size;
}

static ssize_t event_file_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
{
	struct ibmasmfs_event_data *event_data = file->private_data;

	if (*offset < 0)
		return -EINVAL;
	if (count != 1)
		return 0;
	if (*offset != 0)
		return 0;

	wake_up_interruptible(&event_data->reader.wait);
	return 0;
}

static int r_heartbeat_file_open(struct inode *inode, struct file *file)
{
	struct ibmasmfs_heartbeat_data *rhbeat;

	if (!inode->u.generic_ip)
		return -ENODEV;

	rhbeat = kmalloc(sizeof(struct ibmasmfs_heartbeat_data), GFP_KERNEL);
	if (!rhbeat)
		return -ENOMEM;

	rhbeat->sp = (struct service_processor *)inode->u.generic_ip;
	rhbeat->active = 0;
	ibmasm_init_reverse_heartbeat(rhbeat->sp, &rhbeat->heartbeat);
	file->private_data = rhbeat;
	return 0;
}

static int r_heartbeat_file_close(struct inode *inode, struct file *file)
{
	struct ibmasmfs_heartbeat_data *rhbeat = file->private_data;

	kfree(rhbeat);
	return 0;
}

static ssize_t r_heartbeat_file_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
{
	struct ibmasmfs_heartbeat_data *rhbeat = file->private_data;
	unsigned long flags;
	int result;

	if (*offset < 0)
		return -EINVAL;
	if (count == 0 || count > 1024)
		return 0;
	if (*offset != 0)
		return 0;

	/* allow only one reverse heartbeat per process */
	spin_lock_irqsave(&rhbeat->sp->lock, flags);
	if (rhbeat->active) {
		spin_unlock_irqrestore(&rhbeat->sp->lock, flags);
		return -EBUSY;
	}
	rhbeat->active = 1;
	spin_unlock_irqrestore(&rhbeat->sp->lock, flags);

	result = ibmasm_start_reverse_heartbeat(rhbeat->sp, &rhbeat->heartbeat);
	rhbeat->active = 0;

	return result;
}

static ssize_t r_heartbeat_file_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)
{
	struct ibmasmfs_heartbeat_data *rhbeat = file->private_data;

	if (*offset < 0)
		return -EINVAL;
	if (count != 1)
		return 0;
	if (*offset != 0)
		return 0;

	if (rhbeat->active)
		ibmasm_stop_reverse_heartbeat(&rhbeat->heartbeat);

	return 1;
}

static int remote_settings_file_open(struct inode *inode, struct file *file)
{
	file->private_data = inode->u.generic_ip;
	return 0;
}

static int remote_settings_file_close(struct inode *inode, struct file *file)
{
	return 0;
}

static ssize_t remote_settings_file_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
{
	void __iomem *address = (void __iomem *)file->private_data;
	unsigned char *page;
	int retval;
	int len = 0;
	unsigned int value;

	if (*offset < 0)
		return -EINVAL;
	if (count == 0 || count > 1024)
		return 0;
	if (*offset != 0)
		return 0;

	page = (unsigned char *)__get_free_page(GFP_KERNEL);
	if (!page)
		return -ENOMEM;

	value = readl(address);
	len = sprintf(page, "%d\n", value);

	if (copy_to_user(buf, page, len)) {
		retval = -EFAULT;
		goto exit;
	}
	*offset += len;
	retval = len;

exit:
	free_page((unsigned long)page);
	return retval;
}

static ssize_t remote_settings_file_write(struct file *file, const char __user *ubuff, size_t count, loff_t *offset)
{
	void __iomem *address = (void __iomem *)file->private_data;
	char *buff;
	unsigned int value;

	if (*offset < 0)
		return -EINVAL;
	if (count == 0 || count > 1024)
		return 0;
	if (*offset != 0)
		return 0;

	buff = kmalloc (count + 1, GFP_KERNEL);
	if (!buff)
		return -ENOMEM;

	memset(buff, 0x0, count + 1);

	if (copy_from_user(buff, ubuff, count)) {
		kfree(buff);
		return -EFAULT;
	}
	
	value = simple_strtoul(buff, NULL, 10);
	writel(value, address);
	kfree(buff);

	return count;
}

static int remote_event_file_open(struct inode *inode, struct file *file)
{
	struct service_processor *sp;
	unsigned long flags;
	struct remote_queue *q;
	
	file->private_data = inode->u.generic_ip;
	sp = file->private_data;
	q = &sp->remote_queue;

	/* allow only one event reader */
	spin_lock_irqsave(&sp->lock, flags);
	if (q->open) {
		spin_unlock_irqrestore(&sp->lock, flags);
		return -EBUSY;
	}
	q->open = 1;
	spin_unlock_irqrestore(&sp->lock, flags);

	enable_mouse_interrupts(sp);
	
	return 0;
}

static int remote_event_file_close(struct inode *inode, struct file *file)
{
	struct service_processor *sp = file->private_data;

	disable_mouse_interrupts(sp);
	wake_up_interruptible(&sp->remote_queue.wait);
	sp->remote_queue.open = 0;

	return 0;
}

static ssize_t remote_event_file_read(struct file *file, char __user *buf, size_t count, loff_t *offset)
{
	struct service_processor *sp = file->private_data;
	struct remote_queue *q = &sp->remote_queue;
	size_t data_size;
	struct remote_event *reader = q->reader;
	size_t num_events;

	if (*offset < 0)
		return -EINVAL;
	if (count == 0 || count > 1024)
		return 0;
	if (*offset != 0)
		return 0;

	if (wait_event_interruptible(q->wait, q->reader != q->writer))
		return -ERESTARTSYS;

	/* only get multiples of struct remote_event */
	num_events = min((count/sizeof(struct remote_event)), ibmasm_events_available(q));
	if (!num_events)
		return 0;

	data_size = num_events * sizeof(struct remote_event);

	if (copy_to_user(buf, reader, data_size))
		return -EFAULT;

	ibmasm_advance_reader(q, num_events);

	return data_size;
}


static struct file_operations command_fops = {
	.open =		command_file_open,
	.release =	command_file_close,
	.read =		command_file_read,
	.write =	command_file_write,
};

static struct file_operations event_fops = {
	.open =		event_file_open,
	.release =	event_file_close,
	.read =		event_file_read,
	.write =	event_file_write,
};

static struct file_operations r_heartbeat_fops = {
	.open =		r_heartbeat_file_open,
	.release =	r_heartbeat_file_close,
	.read =		r_heartbeat_file_read,
	.write =	r_heartbeat_file_write,
};

static struct file_operations remote_settings_fops = {
	.open =		remote_settings_file_open,
	.release =	remote_settings_file_close,
	.read =		remote_settings_file_read,
	.write =	remote_settings_file_write,
};

static struct file_operations remote_event_fops = {
	.open =		remote_event_file_open,
	.release =	remote_event_file_close,
	.read =		remote_event_file_read,
};


static void ibmasmfs_create_files (struct super_block *sb, struct dentry *root)
{
	struct list_head *entry;
	struct service_processor *sp;

	list_for_each(entry, &service_processors) {
		struct dentry *dir;
		struct dentry *remote_dir;
		sp = list_entry(entry, struct service_processor, node);
		dir = ibmasmfs_create_dir(sb, root, sp->dirname);
		if (!dir)
			continue;

		ibmasmfs_create_file(sb, dir, "command", &command_fops, sp, S_IRUSR|S_IWUSR);
		ibmasmfs_create_file(sb, dir, "event", &event_fops, sp, S_IRUSR|S_IWUSR);
		ibmasmfs_create_file(sb, dir, "reverse_heartbeat", &r_heartbeat_fops, sp, S_IRUSR|S_IWUSR);

		remote_dir = ibmasmfs_create_dir(sb, dir, "remote_video");
		if (!remote_dir)
			continue;

		ibmasmfs_create_file(sb, remote_dir, "width", &remote_settings_fops, (void *)display_width(sp), S_IRUSR|S_IWUSR);
		ibmasmfs_create_file(sb, remote_dir, "height", &remote_settings_fops, (void *)display_height(sp), S_IRUSR|S_IWUSR);
		ibmasmfs_create_file(sb, remote_dir, "depth", &remote_settings_fops, (void *)display_depth(sp), S_IRUSR|S_IWUSR);
		ibmasmfs_create_file(sb, remote_dir, "connected", &remote_settings_fops, (void *)vnc_status(sp), S_IRUSR);
		ibmasmfs_create_file(sb, remote_dir, "events", &remote_event_fops, (void *)sp, S_IRUSR);
	}
}