$OpenBSD: radio.9,v 1.2 2001/10/08 08:52:50 mpech Exp $
Copyright (c) Maxim Tsyplakov <tm (at] oganer.net>
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.Dd September 29, 2001 .Dt RADIO 9 .Os .Sh NAME .Nm radio .Nd interface between low and high level radio drivers .Sh DESCRIPTION The radio device driver is divided into a high level, hardware independent layer, and a low level hardware dependent layer. The interface between these is the .Va radio_hw_if structure. d -literal struct radio_hw_if { int *open(dev_t, int, int, struct proc *); void *close(dev_t, int, int, struct proc *); int *ioctl(dev_t, u_long, caddr_t, int, struct proc *); }; .Ed
p The high level radio driver attaches to the low level driver when the latter calls .Va radio_attach_mi . This call should be d -literal void radio_attach_mi(rhwp, hdlp, dev) struct radio_hw_if *rhwp; void *hdlp; struct device *dev; .Ed
p The .Va radio_hw_if struct is as shown above. The .Va hdlp argument is a handle to some low level data structure. It is reserved field for future usage, and actually not used in any low-level driver functions. .Va radio_hw_if when the high level driver calls them. .Va dev is the device struct for the hardware device.
p The fields of .Va radio_hw_if are described in some more detail below. d -literal int open (dev_t dev, int flags, int fmt, struct proc *p); Is called when the radio device is opened. Returns 0 on success, otherwise an error code. int close (dev_t dev, int flags, int fmt, struct proc *p); Is called when the radio device is closed. Returns 0 on success, otherwise an error code. int ioctl (dev_t dev, u_long cmd, caddr_t data, int flags, struct proc *p); Is ioctl requests handler function. Returns 0 on success, otherwise an error code. .Ed .Sh SEE ALSO .Xr radio 4
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