Cirrus Logic Linux Device Driver Developer interview questions

1 initial screen with one developer for discussion on resume and projects I had done. 1 full day of interview, about 5 interview lasting 45 mins each, 1 senior manager, 1 test lead, 2 developers and 1 HR round. Took around 3 months! (yes, 3 months!) to say that they had other applicants who were more fit for the job.