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This patch converts the SB Emu8000 driver code to use the new unified PCM copy callback. The conversion is a bit complicated because of many open code in emu8000_pcm.c. GET_VAL() and LOOP_WRITE() macros were rewritten / simplified with copy_from_iter(). As copy_from_iter() updates the internal offset value, we can drop the corresponding part, too. Link: https://lore.kernel.org/r/20230815190136.8987-7-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>