417 lines
9.4 KiB
C
417 lines
9.4 KiB
C
/*
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***************************************************************************
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*
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* radio-gemtek-pci.c - Gemtek PCI Radio driver
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* (C) 2001 Vladimir Shebordaev <vshebordaev@mail.ru>
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*
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***************************************************************************
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the Free
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* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139,
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* USA.
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*
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***************************************************************************
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*
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* Gemtek Corp still silently refuses to release any specifications
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* of their multimedia devices, so the protocol still has to be
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* reverse engineered.
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*
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* The v4l code was inspired by Jonas Munsin's Gemtek serial line
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* radio device driver.
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*
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* Please, let me know if this piece of code was useful :)
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*
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* TODO: multiple device support and portability were not tested
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*
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***************************************************************************
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*/
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#include <linux/config.h>
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#include <linux/types.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/pci.h>
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#include <linux/videodev.h>
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#include <linux/errno.h>
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#include <asm/io.h>
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#include <asm/uaccess.h>
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#ifndef PCI_VENDOR_ID_GEMTEK
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#define PCI_VENDOR_ID_GEMTEK 0x5046
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#endif
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#ifndef PCI_DEVICE_ID_GEMTEK_PR103
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#define PCI_DEVICE_ID_GEMTEK_PR103 0x1001
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#endif
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#ifndef GEMTEK_PCI_RANGE_LOW
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#define GEMTEK_PCI_RANGE_LOW (87*16000)
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#endif
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#ifndef GEMTEK_PCI_RANGE_HIGH
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#define GEMTEK_PCI_RANGE_HIGH (108*16000)
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#endif
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#ifndef TRUE
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#define TRUE (1)
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#endif
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#ifndef FALSE
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#define FALSE (0)
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#endif
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struct gemtek_pci_card {
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struct video_device *videodev;
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u32 iobase;
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u32 length;
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u8 chiprev;
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u16 model;
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u32 current_frequency;
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u8 mute;
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};
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static const char rcsid[] = "$Id: radio-gemtek-pci.c,v 1.1 2001/07/23 08:08:16 ted Exp ted $";
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static int nr_radio = -1;
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static inline u8 gemtek_pci_out( u16 value, u32 port )
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{
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outw( value, port );
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return (u8)value;
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}
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#define _b0( v ) *((u8 *)&v)
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static void __gemtek_pci_cmd( u16 value, u32 port, u8 *last_byte, int keep )
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{
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register u8 byte = *last_byte;
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if ( !value ) {
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if ( !keep )
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value = (u16)port;
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byte &= 0xfd;
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} else
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byte |= 2;
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_b0( value ) = byte;
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outw( value, port );
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byte |= 1;
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_b0( value ) = byte;
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outw( value, port );
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byte &= 0xfe;
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_b0( value ) = byte;
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outw( value, port );
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*last_byte = byte;
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}
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static inline void gemtek_pci_nil( u32 port, u8 *last_byte )
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{
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__gemtek_pci_cmd( 0x00, port, last_byte, FALSE );
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}
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static inline void gemtek_pci_cmd( u16 cmd, u32 port, u8 *last_byte )
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{
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__gemtek_pci_cmd( cmd, port, last_byte, TRUE );
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}
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static void gemtek_pci_setfrequency( struct gemtek_pci_card *card, unsigned long frequency )
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{
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register int i;
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register u32 value = frequency / 200 + 856;
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register u16 mask = 0x8000;
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u8 last_byte;
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u32 port = card->iobase;
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last_byte = gemtek_pci_out( 0x06, port );
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i = 0;
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do {
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gemtek_pci_nil( port, &last_byte );
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i++;
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} while ( i < 9 );
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i = 0;
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do {
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gemtek_pci_cmd( value & mask, port, &last_byte );
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mask >>= 1;
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i++;
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} while ( i < 16 );
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outw( 0x10, port );
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}
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static inline void gemtek_pci_mute( struct gemtek_pci_card *card )
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{
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outb( 0x1f, card->iobase );
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card->mute = TRUE;
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}
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static inline void gemtek_pci_unmute( struct gemtek_pci_card *card )
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{
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if ( card->mute ) {
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gemtek_pci_setfrequency( card, card->current_frequency );
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card->mute = FALSE;
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}
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}
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static inline unsigned int gemtek_pci_getsignal( struct gemtek_pci_card *card )
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{
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return ( inb( card->iobase ) & 0x08 ) ? 0 : 1;
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}
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static int gemtek_pci_do_ioctl(struct inode *inode, struct file *file,
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unsigned int cmd, void *arg)
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{
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struct video_device *dev = video_devdata(file);
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struct gemtek_pci_card *card = dev->priv;
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switch ( cmd ) {
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case VIDIOCGCAP:
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{
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struct video_capability *c = arg;
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memset(c,0,sizeof(*c));
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c->type = VID_TYPE_TUNER;
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c->channels = 1;
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c->audios = 1;
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strcpy( c->name, "Gemtek PCI Radio" );
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return 0;
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}
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case VIDIOCGTUNER:
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{
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struct video_tuner *t = arg;
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if ( t->tuner )
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return -EINVAL;
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t->rangelow = GEMTEK_PCI_RANGE_LOW;
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t->rangehigh = GEMTEK_PCI_RANGE_HIGH;
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t->flags = VIDEO_TUNER_LOW;
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t->mode = VIDEO_MODE_AUTO;
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t->signal = 0xFFFF * gemtek_pci_getsignal( card );
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strcpy( t->name, "FM" );
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return 0;
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}
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case VIDIOCSTUNER:
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{
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struct video_tuner *t = arg;
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if ( t->tuner )
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return -EINVAL;
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return 0;
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}
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case VIDIOCGFREQ:
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{
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unsigned long *freq = arg;
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*freq = card->current_frequency;
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return 0;
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}
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case VIDIOCSFREQ:
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{
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unsigned long *freq = arg;
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if ( (*freq < GEMTEK_PCI_RANGE_LOW) ||
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(*freq > GEMTEK_PCI_RANGE_HIGH) )
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return -EINVAL;
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gemtek_pci_setfrequency( card, *freq );
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card->current_frequency = *freq;
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card->mute = FALSE;
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return 0;
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}
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case VIDIOCGAUDIO:
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{
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struct video_audio *a = arg;
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memset( a, 0, sizeof( *a ) );
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a->flags |= VIDEO_AUDIO_MUTABLE;
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a->volume = 1;
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a->step = 65535;
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strcpy( a->name, "Radio" );
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return 0;
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}
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case VIDIOCSAUDIO:
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{
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struct video_audio *a = arg;
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if ( a->audio )
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return -EINVAL;
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if ( a->flags & VIDEO_AUDIO_MUTE )
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gemtek_pci_mute( card );
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else
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gemtek_pci_unmute( card );
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return 0;
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}
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default:
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return -ENOIOCTLCMD;
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}
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}
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static int gemtek_pci_ioctl(struct inode *inode, struct file *file,
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unsigned int cmd, unsigned long arg)
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{
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return video_usercopy(inode, file, cmd, arg, gemtek_pci_do_ioctl);
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}
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enum {
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GEMTEK_PR103
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};
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static char *card_names[] __devinitdata = {
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"GEMTEK_PR103"
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};
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static struct pci_device_id gemtek_pci_id[] =
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{
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{ PCI_VENDOR_ID_GEMTEK, PCI_DEVICE_ID_GEMTEK_PR103,
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PCI_ANY_ID, PCI_ANY_ID, 0, 0, GEMTEK_PR103 },
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{ 0 }
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};
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MODULE_DEVICE_TABLE( pci, gemtek_pci_id );
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static int mx = 1;
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static struct file_operations gemtek_pci_fops = {
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.owner = THIS_MODULE,
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.open = video_exclusive_open,
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.release = video_exclusive_release,
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.ioctl = gemtek_pci_ioctl,
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.llseek = no_llseek,
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};
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static struct video_device vdev_template = {
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.owner = THIS_MODULE,
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.name = "Gemtek PCI Radio",
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.type = VID_TYPE_TUNER,
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.hardware = VID_HARDWARE_GEMTEK,
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.fops = &gemtek_pci_fops,
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};
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static int __devinit gemtek_pci_probe( struct pci_dev *pci_dev, const struct pci_device_id *pci_id )
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{
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struct gemtek_pci_card *card;
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struct video_device *devradio;
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if ( (card = kmalloc( sizeof( struct gemtek_pci_card ), GFP_KERNEL )) == NULL ) {
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printk( KERN_ERR "gemtek_pci: out of memory\n" );
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return -ENOMEM;
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}
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memset( card, 0, sizeof( struct gemtek_pci_card ) );
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if ( pci_enable_device( pci_dev ) )
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goto err_pci;
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card->iobase = pci_resource_start( pci_dev, 0 );
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card->length = pci_resource_len( pci_dev, 0 );
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if ( request_region( card->iobase, card->length, card_names[pci_id->driver_data] ) == NULL ) {
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printk( KERN_ERR "gemtek_pci: i/o port already in use\n" );
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goto err_pci;
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}
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pci_read_config_byte( pci_dev, PCI_REVISION_ID, &card->chiprev );
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pci_read_config_word( pci_dev, PCI_SUBSYSTEM_ID, &card->model );
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pci_set_drvdata( pci_dev, card );
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if ( (devradio = kmalloc( sizeof( struct video_device ), GFP_KERNEL )) == NULL ) {
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printk( KERN_ERR "gemtek_pci: out of memory\n" );
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goto err_video;
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}
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*devradio = vdev_template;
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if ( video_register_device( devradio, VFL_TYPE_RADIO , nr_radio) == -1 ) {
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kfree( devradio );
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goto err_video;
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}
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card->videodev = devradio;
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devradio->priv = card;
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gemtek_pci_mute( card );
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printk( KERN_INFO "Gemtek PCI Radio (rev. %d) found at 0x%04x-0x%04x.\n",
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card->chiprev, card->iobase, card->iobase + card->length - 1 );
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return 0;
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err_video:
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release_region( card->iobase, card->length );
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err_pci:
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kfree( card );
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return -ENODEV;
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}
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static void __devexit gemtek_pci_remove( struct pci_dev *pci_dev )
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{
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struct gemtek_pci_card *card = pci_get_drvdata( pci_dev );
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video_unregister_device( card->videodev );
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kfree( card->videodev );
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release_region( card->iobase, card->length );
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if ( mx )
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gemtek_pci_mute( card );
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kfree( card );
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pci_set_drvdata( pci_dev, NULL );
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}
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static struct pci_driver gemtek_pci_driver =
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{
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.name = "gemtek_pci",
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.id_table = gemtek_pci_id,
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.probe = gemtek_pci_probe,
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.remove = __devexit_p(gemtek_pci_remove),
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};
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static int __init gemtek_pci_init_module( void )
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{
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return pci_module_init( &gemtek_pci_driver );
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}
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static void __exit gemtek_pci_cleanup_module( void )
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{
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return pci_unregister_driver( &gemtek_pci_driver );
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}
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MODULE_AUTHOR( "Vladimir Shebordaev <vshebordaev@mail.ru>" );
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MODULE_DESCRIPTION( "The video4linux driver for the Gemtek PCI Radio Card" );
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MODULE_LICENSE("GPL");
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module_param(mx, bool, 0);
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MODULE_PARM_DESC( mx, "single digit: 1 - turn off the turner upon module exit (default), 0 - do not" );
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module_param(nr_radio, int, 0);
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MODULE_PARM_DESC( nr_radio, "video4linux device number to use");
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module_init( gemtek_pci_init_module );
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module_exit( gemtek_pci_cleanup_module );
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