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radio-gemtek-pci.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:10k
源码类别:
Linux/Unix编程
开发平台:
Unix_Linux
- /*
- ***************************************************************************
- *
- * radio-gemtek-pci.c - Gemtek PCI Radio driver
- * (C) 2001 Vladimir Shebordaev <vshebordaev@mail.ru>
- *
- ***************************************************************************
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of
- * the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public
- * License along with this program; if not, write to the Free
- * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139,
- * USA.
- *
- ***************************************************************************
- *
- * Gemtek Corp still silently refuses to release any specifications
- * of their multimedia devices, so the protocol still has to be
- * reverse engineered.
- *
- * The v4l code was inspired by Jonas Munsin's Gemtek serial line
- * radio device driver.
- *
- * Please, let me know if this piece of code was useful :)
- *
- * TODO: multiple device support and portability were not tested
- *
- ***************************************************************************
- */
- #include <linux/version.h>
- #include <linux/config.h>
- #include <linux/types.h>
- #include <linux/list.h>
- #include <linux/module.h>
- #include <linux/init.h>
- #include <linux/pci.h>
- #include <linux/videodev.h>
- #include <linux/errno.h>
- #include <asm/io.h>
- #include <asm/uaccess.h>
- #ifndef PCI_VENDOR_ID_GEMTEK
- #define PCI_VENDOR_ID_GEMTEK 0x5046
- #endif
- #ifndef PCI_DEVICE_ID_GEMTEK_PR103
- #define PCI_DEVICE_ID_GEMTEK_PR103 0x1001
- #endif
- #ifndef GEMTEK_PCI_RANGE_LOW
- #define GEMTEK_PCI_RANGE_LOW (87*16000)
- #endif
- #ifndef GEMTEK_PCI_RANGE_HIGH
- #define GEMTEK_PCI_RANGE_HIGH (108*16000)
- #endif
- #ifndef TRUE
- #define TRUE (1)
- #endif
- #ifndef FALSE
- #define FALSE (0)
- #endif
- struct gemtek_pci_card {
- struct video_device *videodev;
- u32 iobase;
- u32 length;
- u8 chiprev;
- u16 model;
- u32 current_frequency;
- u8 mute;
- };
- static const char rcsid[] = "$Id: radio-gemtek-pci.c,v 1.1 2001/07/23 08:08:16 ted Exp ted $";
- static int nr_radio = -1;
- static int gemtek_pci_open( struct video_device *dev, int flags)
- {
- struct gemtek_pci_card *card = dev->priv;
- /* Paranoid check */
- if ( !card )
- return -ENODEV;
- return 0;
- }
- static void gemtek_pci_close( struct video_device *dev )
- {
- /*
- * The module usage is managed by 'videodev'
- */
- }
- static inline u8 gemtek_pci_out( u16 value, u32 port )
- {
- outw( value, port );
- return (u8)value;
- }
- #define _b0( v ) *((u8 *)&v)
- static void __gemtek_pci_cmd( u16 value, u32 port, u8 *last_byte, int keep )
- {
- register u8 byte = *last_byte;
- if ( !value ) {
- if ( !keep )
- value = (u16)port;
- byte &= 0xfd;
- } else
- byte |= 2;
- _b0( value ) = byte;
- outw( value, port );
- byte |= 1;
- _b0( value ) = byte;
- outw( value, port );
- byte &= 0xfe;
- _b0( value ) = byte;
- outw( value, port );
- *last_byte = byte;
- }
- static inline void gemtek_pci_nil( u32 port, u8 *last_byte )
- {
- __gemtek_pci_cmd( 0x00, port, last_byte, FALSE );
- }
- static inline void gemtek_pci_cmd( u16 cmd, u32 port, u8 *last_byte )
- {
- __gemtek_pci_cmd( cmd, port, last_byte, TRUE );
- }
- static void gemtek_pci_setfrequency( struct gemtek_pci_card *card, unsigned long frequency )
- {
- register int i;
- register u32 value = frequency / 200 + 856;
- register u16 mask = 0x8000;
- u8 last_byte;
- u32 port = card->iobase;
- last_byte = gemtek_pci_out( 0x06, port );
- i = 0;
- do {
- gemtek_pci_nil( port, &last_byte );
- i++;
- } while ( i < 9 );
- i = 0;
- do {
- gemtek_pci_cmd( value & mask, port, &last_byte );
- mask >>= 1;
- i++;
- } while ( i < 16 );
- outw( 0x10, port );
- }
- static inline void gemtek_pci_mute( struct gemtek_pci_card *card )
- {
- outb( 0x1f, card->iobase );
- card->mute = TRUE;
- }
- static inline void gemtek_pci_unmute( struct gemtek_pci_card *card )
- {
- if ( card->mute ) {
- gemtek_pci_setfrequency( card, card->current_frequency );
- card->mute = FALSE;
- }
- }
- static inline unsigned int gemtek_pci_getsignal( struct gemtek_pci_card *card )
- {
- return ( inb( card->iobase ) & 0x08 ) ? 0 : 1;
- }
- static int gemtek_pci_ioctl( struct video_device *dev, unsigned int cmd, void *arg)
- {
- struct gemtek_pci_card *card = dev->priv;
- switch ( cmd ) {
- case VIDIOCGCAP:
- {
- struct video_capability c;
- c.type = VID_TYPE_TUNER;
- c.channels = 1;
- c.audios = 1;
- c.maxwidth = 0;
- c.maxheight = 0;
- c.minwidth = 0;
- c.minheight = 0;
- strcpy( c.name, "Gemtek PCI Radio" );
- if ( copy_to_user( arg, &c, sizeof( c ) ) )
- return -EFAULT;
- return 0;
- }
- case VIDIOCGTUNER:
- {
- struct video_tuner t;
- int signal;
- if ( copy_from_user( &t, arg, sizeof( struct video_tuner ) ) )
- return -EFAULT;
- if ( t.tuner )
- return -EINVAL;
- signal = gemtek_pci_getsignal( card );
- t.rangelow = GEMTEK_PCI_RANGE_LOW;
- t.rangehigh = GEMTEK_PCI_RANGE_HIGH;
- t.flags = VIDEO_TUNER_LOW | (7 << signal) ;
- t.mode = VIDEO_MODE_AUTO;
- t.signal = 0xFFFF * signal;
- strcpy( t.name, "FM" );
- if ( copy_to_user( arg, &t, sizeof( struct video_tuner ) ) )
- return -EFAULT;
- return 0;
- }
- case VIDIOCSTUNER:
- {
- struct video_tuner t;
- if ( copy_from_user( &t, arg, sizeof( struct video_tuner ) ) )
- return -EFAULT;
- if ( t.tuner )
- return -EINVAL;
- return 0;
- }
- case VIDIOCGFREQ:
- return put_user( card->current_frequency, (u32 *)arg );
- case VIDIOCSFREQ:
- {
- u32 frequency;
- if ( get_user( frequency, (u32 *)arg ) )
- return -EFAULT;
- if ( (frequency < GEMTEK_PCI_RANGE_LOW) || (frequency > GEMTEK_PCI_RANGE_HIGH) )
- return -EINVAL;
- gemtek_pci_setfrequency( card, frequency );
- card->current_frequency = frequency;
- card->mute = FALSE;
- return 0;
- }
- case VIDIOCGAUDIO:
- {
- struct video_audio a;
- memset( &a, 0, sizeof( a ) );
- a.flags |= VIDEO_AUDIO_MUTABLE;
- a.volume = 1;
- a.step = 65535;
- a.mode = (1 << gemtek_pci_getsignal( card ));
- strcpy( a.name, "Radio" );
- if ( copy_to_user( arg, &a, sizeof( struct video_audio ) ) )
- return -EFAULT;
- return 0;
- }
- case VIDIOCSAUDIO:
- {
- struct video_audio a;
- if ( copy_from_user( &a, arg, sizeof( struct video_audio ) ) )
- return -EFAULT;
- if ( a.audio )
- return -EINVAL;
- if ( a.flags & VIDEO_AUDIO_MUTE )
- gemtek_pci_mute( card );
- else
- gemtek_pci_unmute( card );
- return 0;
- }
- default:
- return -ENOIOCTLCMD;
- }
- }
- enum {
- GEMTEK_PR103
- };
- static char *card_names[] __devinitdata = {
- "GEMTEK_PR103"
- };
- static struct pci_device_id gemtek_pci_id[] =
- {
- { PCI_VENDOR_ID_GEMTEK, PCI_DEVICE_ID_GEMTEK_PR103,
- PCI_ANY_ID, PCI_ANY_ID, 0, 0, GEMTEK_PR103 },
- { 0 }
- };
- MODULE_DEVICE_TABLE( pci, gemtek_pci_id );
- static u8 mx = 1;
- static char gemtek_pci_videodev_name[] = "Gemtek PCI Radio";
- static inline void gemtek_pci_init_struct( struct video_device *dev )
- {
- memset( dev, 0, sizeof( struct video_device ) );
- dev->owner = THIS_MODULE;
- strcpy( dev->name , gemtek_pci_videodev_name );
- dev->type = VID_TYPE_TUNER;
- dev->hardware = VID_HARDWARE_GEMTEK;
- dev->open = gemtek_pci_open;
- dev->close = gemtek_pci_close;
- dev->ioctl = gemtek_pci_ioctl;
- }
- static int __devinit gemtek_pci_probe( struct pci_dev *pci_dev, const struct pci_device_id *pci_id )
- {
- struct gemtek_pci_card *card;
- struct video_device *devradio;
- if ( (card = kmalloc( sizeof( struct gemtek_pci_card ), GFP_KERNEL )) == NULL ) {
- printk( KERN_ERR "gemtek_pci: out of memoryn" );
- return -ENOMEM;
- }
- memset( card, 0, sizeof( struct gemtek_pci_card ) );
- if ( pci_enable_device( pci_dev ) )
- goto err_pci;
- card->iobase = pci_resource_start( pci_dev, 0 );
- card->length = pci_resource_len( pci_dev, 0 );
- if ( request_region( card->iobase, card->length, card_names[pci_id->driver_data] ) == NULL ) {
- printk( KERN_ERR "gemtek_pci: i/o port already in usen" );
- goto err_pci;
- }
- pci_read_config_byte( pci_dev, PCI_REVISION_ID, &card->chiprev );
- pci_read_config_word( pci_dev, PCI_SUBSYSTEM_ID, &card->model );
- pci_set_drvdata( pci_dev, card );
- if ( (devradio = kmalloc( sizeof( struct video_device ), GFP_KERNEL )) == NULL ) {
- printk( KERN_ERR "gemtek_pci: out of memoryn" );
- goto err_video;
- }
- gemtek_pci_init_struct( devradio );
- if ( video_register_device( devradio, VFL_TYPE_RADIO , nr_radio) == -1 ) {
- kfree( devradio );
- goto err_video;
- }
- card->videodev = devradio;
- devradio->priv = card;
- gemtek_pci_mute( card );
- printk( KERN_INFO "Gemtek PCI Radio (rev. %d) found at 0x%04x-0x%04x.n",
- card->chiprev, card->iobase, card->iobase + card->length - 1 );
- return 0;
- err_video:
- release_region( card->iobase, card->length );
- err_pci:
- kfree( card );
- return -ENODEV;
- }
- static void __devexit gemtek_pci_remove( struct pci_dev *pci_dev )
- {
- struct gemtek_pci_card *card = pci_get_drvdata( pci_dev );
- video_unregister_device( card->videodev );
- kfree( card->videodev );
- release_region( card->iobase, card->length );
- if ( mx )
- gemtek_pci_mute( card );
- kfree( card );
- pci_set_drvdata( pci_dev, NULL );
- }
- static struct pci_driver gemtek_pci_driver =
- {
- name: "gemtek_pci",
- id_table: gemtek_pci_id,
- probe: gemtek_pci_probe,
- remove: __devexit_p(gemtek_pci_remove),
- };
- static int __init gemtek_pci_init_module( void )
- {
- return pci_module_init( &gemtek_pci_driver );
- }
- static void __exit gemtek_pci_cleanup_module( void )
- {
- return pci_unregister_driver( &gemtek_pci_driver );
- }
- MODULE_AUTHOR( "Vladimir Shebordaev <vshebordaev@mail.ru>" );
- MODULE_DESCRIPTION( "The video4linux driver for the Gemtek PCI Radio Card" );
- MODULE_LICENSE("GPL");
- MODULE_PARM( mx, "b" );
- MODULE_PARM_DESC( mx, "single digit: 1 - turn off the turner upon module exit (default), 0 - do not" );
- MODULE_PARM( nr_radio, "i");
- MODULE_PARM_DESC( nr_radio, "video4linux device number to use");
- EXPORT_NO_SYMBOLS;
- module_init( gemtek_pci_init_module );
- module_exit( gemtek_pci_cleanup_module );