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The ISA ES1688 driver still carries a disabled suspend/resume block in its isa_driver definition, while the same file already provides minimal power-management handling for the PnP ES968 path. Add ISA-specific PM callbacks and factor the existing ES1688 suspend and resume sequence into common card-level helpers shared by both probe paths. Suspend moves the card to D3hot. Resume reinitializes the chip with snd_es1688_reset() and restores the card to D0, propagating reset failures to the caller. This wires up power-management callbacks for the ISA path and keeps the PM handling consistent between the ISA and PnP probe paths. Signed-off-by: Cássio Gabriel <cassiogabrielcontato@gmail.com> Link: https://patch.msgid.link/20260401-alsa-es1688-pm-v1-1-510767628fe6@gmail.com Signed-off-by: Takashi Iwai <tiwai@suse.de>