ibmasmfs.c

linux-2.6.15.6

	if (command_data->command)
		return -EAGAIN;

	cmd = ibmasm_new_command(command_data->sp, count);
	if (!cmd)
		return -ENOMEM;

	if (copy_from_user(cmd->buffer, ubuff, count)) {
		command_put(cmd);
		return -EFAULT;
	}

	spin_lock_irqsave(&command_data->sp->lock, flags);
	if (command_data->command) {
		spin_unlock_irqrestore(&command_data->sp->lock, flags);
		command_put(cmd);
		return -EAGAIN;
	}
	command_data->command = cmd;
	spin_unlock_irqrestore(&command_data->sp->lock, flags);

	ibmasm_exec_command(command_data->sp, cmd);
	ibmasm_wait_for_response(cmd, get_dot_command_timeout(cmd->buffer));

	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;
	event_data->active = 0;
	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;
	struct service_processor *sp = event_data->sp;
	int ret;
	unsigned long flags;

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

	spin_lock_irqsave(&sp->lock, flags);
	if (event_data->active) {
		spin_unlock_irqrestore(&sp->lock, flags);
		return -EBUSY;
	}
	event_data->active = 1;
	spin_unlock_irqrestore(&sp->lock, flags);

	ret = ibmasm_get_next_event(sp, reader);
	if (ret <= 0)
		goto out;

	if (count < reader->data_size) {
		ret = -EINVAL;
		goto out;
	}

        if (copy_to_user(buf, reader->data, reader->data_size)) {
		ret = -EFAULT;
		goto out;
	}
	ret = reader->data_size;

out:
	event_data->active = 0;
	return ret;
}

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;

	ibmasm_cancel_next_event(&event_data->reader);
	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 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 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);
	}
}