Ellison was arrested last month after he was stopped for speeding in a school zone near his former high school. Sgt. Peter Grimm said a search of Ellison's vehicle turned up 100 Vicodin pills. He was booked and released on $10,000 bail.
Ellison had been told by Chargers coach Norv Turner to stay away from minicamp last month after his arrest.
He's due in court July 7.
When asked by the San Diego Union-Tribune on what he was told when he was released, Ellison declined to comment.
Ellison, who played at USC, started nine games at strong safety as a rookie in 2009.
The Chargers picked strong safety Darrell Stuckey of Kansas in the fourth round of last month's draft.
Ellison said he hopes to be signed by another NFL team.
"The Chargers felt they needed to move in a different direction, and now I have to move in a different direction," Ellison told the Union-Tribune. "I'll just let things take their course."
Information from The Associated Press was used in this report.