.\" $RuOBSD: radio.4,v 1.4 2001/10/26 05:38:43 form Exp $ .\" $OpenBSD: radio.4,v 1.18 2003/06/06 10:29:41 jmc Exp $ .\" .\" Copyright (c) 2001 Vladimir Popov .\" All rights reserved. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR .\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES .\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. .\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, .\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, .\" BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF .\" USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON .\" ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. .\" .Dd October 20, 2001 .Dt RADIO 4 .Os .Sh NAME .Nm radio .Nd device-independent radio driver layer .Sh SYNOPSIS .Cd "radio* at az?" .Cd "radio* at bktr?" .Cd "radio* at fms?" .Cd "radio* at gtp?" .Cd "radio* at rt?" .Cd "radio* at rtii?" .Cd "radio* at sfr?" .Cd "radio* at sf2r?" .Cd "radio* at udsbr?" .Pp .Fd #include .Fd #include .Fd #include .Sh DESCRIPTION The .Nm driver provides support for various FM radio cards. It provides an uniform programming interface layer above different underlying radio hardware drivers. .Pp For radio tuner controlling there is a single device file available: .Pa /dev/radio . .Pp The following .Xr ioctl 2 commands are supported: .Pp .Bl -tag -width indent -compact .It Dv RIOCSSRCH (int) This command assumes that a signal search is required and gives direction of search to the driver - 0 to search down and any non-zero value to search up. .It Dv RIOCSINFO (struct radio_info) .It Dv RIOCGINFO (struct radio_info) Get or set the current hardware device information into the struct radio_info structure. .Bd -literal struct radio_info { int mute; int volume; int stereo; int rfreq; /* reference frequency */ int lock; /* locking field strength */ u_int32_t freq; /* in kHz */ u_int32_t caps; /* card capabilities */ #define RADIO_CAPS_DETECT_STEREO (1<<0) #define RADIO_CAPS_DETECT_SIGNAL (1<<1) #define RADIO_CAPS_SET_MONO (1<<2) #define RADIO_CAPS_HW_SEARCH (1<<3) #define RADIO_CAPS_HW_AFC (1<<4) #define RADIO_CAPS_REFERENCE_FREQ (1<<5) #define RADIO_CAPS_LOCK_SENSITIVITY (1<<6) #define RADIO_CARD_TYPE (0xFF<<16) u_int32_t info; #define RADIO_INFO_STEREO (1<<0) #define RADIO_INFO_SIGNAL (1<<1) }; .Ed .Pp The .Va mute field is a boolean. .Pp The .Va volume field holds the card volume information and can be at most 255. .Pp The .Va stereo field is a boolean. .Pp The .Va rfreq holds information about the card reference frequency (not all cards support this feature). .Pp The .Va lock field holds information about the card locking field strength during an automatic search for cards that support this feature. .Pp The .Va freq field is the frequency in kHz the card is tuned to. .Pp The .Va caps field is read-only and describes the card capabilities. The capabilities can have the following values: .Pp .Bl -tag -width indent -compact .It Dv RADIO_CAPS_DETECT_STEREO The device can determine if it is tuned to a stereo signal. .It Dv RADIO_CAPS_DETECT_SIGNAL The device can determine if it is tuned or not. .It Dv RADIO_CAPS_SET_MONO The device is capable of forcibly setting its output to mono. .It Dv RADIO_CAPS_HW_SEARCH The device can do hardware search. .It Dv RADIO_CAPS_HW_AFC The device has an internal hardware automatic frequency control. .It Dv RADIO_CAPS_REFERENCE_FREQ The device allows changing the reference frequency of a received signal. .It Dv RADIO_CAPS_LOCK_SENSITIVITY The device allows changing the station lock sensitivity used during search operation. .It Dv RADIO_CAPS_CARD_TYPE Some cards have several different incarnations. This allows the variant of the card to be determined. Currently not used. .El .Pp The .Va info field is read-only and describes the current state of the card - tuned/not tuned, stereo signal/mono signal. .Pp .Bl -tag -width indent -compact .It Dv RADIO_INFO_SIGNAL Informs whether the device receives a valid signal or noise. .It Dv RADIO_INFO_STEREO Informs whether the device receives a stereo or mono signal. .El .El .Sh CHIPSETS LM700x is a frequency synthesizer IC. The LM700x is programmed through a 24-bit write-only shift register. The first 14 bits are frequency data. The next 2 bits are LSI test bits, and should always be zero. The next 4 bits are band data and time base data. They can be programmed to force a given reference frequency, or they can be set to zero and the next 3 bits can be used to set the reference frequency. The final bit selects the divider selection, which is 1 for FM and 0 for AM. The LM700x chips are used in .Xr az 4 and .Xr rt 4 cards. .Pp The TEA5757; TEA5759 is a 44-pin integrated AM/FM stereo radio circuit. The radio part is based on the TEA5712. The TEA5757 is used in FM-standards in which the local oscillator frequency is above the radio frequency (e.g. European and American standards). The TEA5759 is the version in which the oscillator frequency is below the radio frequency (e.g. Japanese standards). To conform with the Japanese standards, it is necessary to set the flags' least significant bit to 1. The TEA5757; TEA5759 has a 25-bit read-write shift register. The TEA5757 chips are used in .Xr gtp 4 , .Xr rtii 4 , .Xr sf2r 4 and .Xr fms 4 cards. .Pp The TC9216P, TC9217P and TC9217F are high speed PLL-LSI with built-in 2 modulus prescaler. Each function is controlled through 3 serial bus lines (DATA, CLOCK and PERIOD) by the data setting to a pair of 24-bit registers, total of 48 bits. Address 8 bits and data 24 bits, total of 32 bits, are transferred in serial at the same time. The TC921x chips are used in .Xr sfr 4 cards. .Sh FILES .Bl -tag -width /dev/radio -compact .It Pa /dev/radio .El .Sh SEE ALSO .Xr ioctl 2 , .Xr az 4 , .Xr bktr 4 , .Xr fms 4 , .Xr gtp 4 , .Xr intro 4 , .Xr rt 4 , .Xr rtii 4 , .Xr sf2r 4 , .Xr sfr 4 , .Xr udsbr 4 , .Xr radio 9 .Sh HISTORY The .Nm device driver appeared in .Ox 3.0 . .Sh AUTHORS The .Nm driver was written by .An Vladimir Popov Aq jumbo@narod.ru and .An Maxim Tsyplakov Aq tm@oganer.net . The man page was written by .An Vladimir Popov Aq jumbo@narod.ru .