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macOS is UNIX V7 compliant.
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snd_ac97_update_power(9) [centos man page]

SND_AC97_UPDATE_POWE(9) 					 Control/Mixer API					   SND_AC97_UPDATE_POWE(9)

NAME
snd_ac97_update_power - update the powerdown register SYNOPSIS
int snd_ac97_update_power(struct snd_ac97 * ac97, int reg, int powerup); ARGUMENTS
ac97 the codec instance reg the rate register, e.g. AC97_PCM_FRONT_DAC_RATE powerup non-zero when power up the part DESCRIPTION
Update the AC97 powerdown register bits of the given part. RETURN
Zero. COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 SND_AC97_UPDATE_POWE(9)

Check Out this Related Man Page

PCI(3)							   BSD Library Functions Manual 						    PCI(3)

NAME
pci -- library interface for PCI bus access LIBRARY
PCI Bus Access Library (libpci, -lpci) SYNOPSIS
#include <pci.h> int pcibus_conf_read(int pcifd, u_int bus, u_int dev, u_int func, u_int reg, pcireg_t *valp); int pcibus_conf_write(int pcifd, u_int bus, u_int dev, u_int func, u_int reg, pcireg_t val); int pcidev_conf_read(int devfd, u_int reg, pcireg_t *valp); int pcidev_conf_write(int devfd, u_int reg, pcireg_t val); char * pci_findvendor(pcireg_t id_reg); void pci_devinfo(pcireg_t id_reg, pcireg_t class_reg, char *devinfo, size_t len); void pci_conf_print(int pcifd, u_int bus, u_int dev, u_int func); DESCRIPTION
The pci library provides support for accessing the PCI bus by user programs. These functions are available in the libpci library. Programs should be linked with -lpci. CONFIGURATION SPACE FUNCTIONS
The following functions are used to access PCI configuration space: pcibus_conf_read() Access the PCI configuration register reg on the device located at bus, dev, func, and place the result in *valp. pcifd must be an open file descriptor to a PCI bus within the target PCI domain. pcibus_conf_write() Write the value specified by val into the PCI configuration register reg on the device located at bus, dev, func. pcifd must be an open file descriptor to a PCI bus within the target PCI domain. pcidev_conf_read() Access the PCI configuration register reg on the device associated with the open file descriptor devfd and place the result in *valp. pcidev_conf_write() Write the value specified by val into the PCI configuration register reg on the device associated with the open file descriptor devfd. MISCELLANEOUS FUNCTIONS
The following miscellaneous functions are available: pci_findvendor() Return an ASCII description of the PCI vendor in the PCI ID register id_reg. pci_devinfo() Return an ASCII description of the PCI vendor, PCI product, and PCI class specified by the PCI ID register id_reg and PCI class ID reg- ister class_reg. The description is placed into the buffer pointed to by devinfo; the size of that buffer is specified in len. pci_conf_print() Print the PCI configuration information for the device located at bus, dev, func. pcifd must be an open file descriptor to a PCI bus within the target PCI domain. RETURN VALUES
The pcibus_conf_read(), pcibus_conf_write(), pcidev_conf_read(), and pcidev_conf_write() functions return 0 on success and -1 on failure. The pci_findvendor() function returns NULL if the PCI vendor description cannot be found. SEE ALSO
pci(4) HISTORY
The pcibus_conf_read(), pcibus_conf_write(), pcidev_conf_read(), pcidev_conf_write(), pci_findvendor(), pci_devinfo(), and pci_conf_print() functions first appeared in NetBSD 1.6. BSD
April 24, 2004 BSD

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