How can I auto-populate field in add item Document Library?

I'm developing a SharePoint 2010 Foundation Farm Solution. I've created a Document Library (Attachments) with 3 custom field (A,B,C).

I open a pop-up like image below with this code:

function openDialog() {
    var options = SP.UI.$create_DialogOptions();
    options.resizable = 1;
    options.scroll = 1;
    options.url = "http://site/Lists/MyList/Forms/Upload.aspx";
    options.dialogReturnValueCallback = Function.createDelegate(null, function () { });
    SP.UI.ModalDialog.showModalDialog(options);
}

After upload I would pass value parameter (Can I perform this by JavaScript?) and disable modify feature.

How can I develop this feature?

Thanks for your support.