Investors were hopeful of Skyworks' earnings following Apple Inc's AAPL.O strong quarterly showing on Thursday, but global smartphone sales have been suffering from weak demand. Chip gear maker Skyworks Solutions Inc's SWKS.O shares tumbled 9.8% in premarket trading after projecting its current-quarter revenue and earnings short of estimates. Apart from earnings reports, attention will be on inflation data on Wednesday, which is expected to show the Labor Department's consumer price index (CPI) likely climbed 0.4% in April after gaining 0.1% in March.