I want to annotate the SNP6 data from tcga with its chromosomal coordinates and allele information using bioconductor packages.

Composite Element REF   Call    Confidence

SNP_A-2131660   2       0.0048

SNP_A-1967418   2       0.1260

SNP_A-1969580   2       0.0047

SNP_A-4263484   1       0.0002

SNP_A-1978185   0       0.0027

SNP_A-4264431   0       0.0017

SNP_A-1980898   2       0.0148