FTC files suit against Qualcomm, citing anti-competitive deal it struck with Apple
While Apple did lock itself into taking these chips from Qualcomm, it was able to work out lower royalty costs allowing it to save money on the production of the iPhone. The deal came about as a result of Apple's request to Qualcomm to lower the royalty payments it had to pay the chip maker. Qualcomm agreed to lower those payments with the provision that Apple would use its chips exclusively. The FTC says that this violates U.S. competition law and is asking the court to bar Qualcomm from entering into future anti-competitive deals.
Qualcomm responded with a statement denying any wrong doing on its part. In addition, it said that the central thesis to the FTC's case is incorrect. You can check out the court filing by clicking on the sourcelink.
source: FTC.gov (PDF) via PCMag