/* *************************************************************************** * * 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/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 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_do_ioctl(struct inode *inode, struct file *file, unsigned int cmd, void *arg) { struct video_device *dev = video_devdata(file); struct gemtek_pci_card *card = dev->priv; switch ( cmd ) { case VIDIOCGCAP: { struct video_capability *c = arg; memset(c,0,sizeof(*c)); c->type = VID_TYPE_TUNER; c->channels = 1; c->audios = 1; strcpy( c->name, "Gemtek PCI Radio" ); return 0; } case VIDIOCGTUNER: { struct video_tuner *t = arg; if ( t->tuner ) return -EINVAL; t->rangelow = GEMTEK_PCI_RANGE_LOW; t->rangehigh = GEMTEK_PCI_RANGE_HIGH; t->flags = VIDEO_TUNER_LOW; t->mode = VIDEO_MODE_AUTO; t->signal = 0xFFFF * gemtek_pci_getsignal( card ); strcpy( t->name, "FM" ); return 0; } case VIDIOCSTUNER: { struct video_tuner *t = arg; if ( t->tuner ) return -EINVAL; return 0; } case VIDIOCGFREQ: { unsigned long *freq = arg; *freq = card->current_frequency; return 0; } case VIDIOCSFREQ: { unsigned long *freq = arg; if ( (*freq < GEMTEK_PCI_RANGE_LOW) || (*freq > GEMTEK_PCI_RANGE_HIGH) ) return -EINVAL; gemtek_pci_setfrequency( card, *freq ); card->current_frequency = *freq; card->mute = FALSE; return 0; } case VIDIOCGAUDIO: { struct video_audio *a = arg; memset( a, 0, sizeof( *a ) ); a->flags |= VIDEO_AUDIO_MUTABLE; a->volume = 1; a->step = 65535; strcpy( a->name, "Radio" ); return 0; } case VIDIOCSAUDIO: { struct video_audio *a = arg; 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; } } static int gemtek_pci_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) { return video_usercopy(inode, file, cmd, arg, gemtek_pci_do_ioctl); } 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 int mx = 1; static struct file_operations gemtek_pci_fops = { .owner = THIS_MODULE, .open = video_exclusive_open, .release = video_exclusive_release, .ioctl = gemtek_pci_ioctl, .compat_ioctl = v4l_compat_ioctl32, .llseek = no_llseek, }; static struct video_device vdev_template = { .owner = THIS_MODULE, .name = "Gemtek PCI Radio", .type = VID_TYPE_TUNER, .hardware = VID_HARDWARE_GEMTEK, .fops = &gemtek_pci_fops, }; 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 memory\n" ); 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 use\n" ); 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 memory\n" ); goto err_video; } *devradio = vdev_template; 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_param(mx, bool, 0); MODULE_PARM_DESC( mx, "single digit: 1 - turn off the turner upon module exit (default), 0 - do not" ); module_param(nr_radio, int, 0); MODULE_PARM_DESC( nr_radio, "video4linux device number to use"); module_init( gemtek_pci_init_module ); module_exit( gemtek_pci_cleanup_module );