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linux-kernel-test/drivers/media/radio/radio-gemtek-pci.c
Arjan van de Ven fa027c2a0a [PATCH] mark struct file_operations const 4 
Many struct file_operations in the kernel can be "const".  Marking them const
moves these to the .rodata section, which avoids false sharing with potential
dirty data.  In addition it'll catch accidental writes at compile time to
these shared resources.

[akpm@sdl.org: dvb fix]
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-12 09:48:45 -08:00

467 lines
11 KiB
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/*
***************************************************************************
*
* 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
*
* Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
*
***************************************************************************
*/
#include <linux/types.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/videodev2.h>
#include <media/v4l2-common.h>
#include <linux/errno.h>
#include <linux/version.h> /* for KERNEL_VERSION MACRO */
#define RADIO_VERSION KERNEL_VERSION(0,0,2)
static struct v4l2_queryctrl radio_qctrl[] = {
{
.id = V4L2_CID_AUDIO_MUTE,
.name = "Mute",
.minimum = 0,
.maximum = 1,
.default_value = 1,
.type = V4L2_CTRL_TYPE_BOOLEAN,
},{
.id = V4L2_CID_AUDIO_VOLUME,
.name = "Volume",
.minimum = 0,
.maximum = 65535,
.step = 65535,
.default_value = 0xff,
.type = V4L2_CTRL_TYPE_INTEGER,
}
};
#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 VIDIOC_QUERYCAP:
{
struct v4l2_capability *v = arg;
memset(v,0,sizeof(*v));
strlcpy(v->driver, "radio-gemtek-pci", sizeof (v->driver));
strlcpy(v->card, "GemTek PCI Radio", sizeof (v->card));
sprintf(v->bus_info,"ISA");
v->version = RADIO_VERSION;
v->capabilities = V4L2_CAP_TUNER;
return 0;
}
case VIDIOC_G_TUNER:
{
struct v4l2_tuner *v = arg;
if (v->index > 0)
return -EINVAL;
memset(v,0,sizeof(*v));
strcpy(v->name, "FM");
v->type = V4L2_TUNER_RADIO;
v->rangelow = GEMTEK_PCI_RANGE_LOW;
v->rangehigh = GEMTEK_PCI_RANGE_HIGH;
v->rxsubchans =V4L2_TUNER_SUB_MONO;
v->capability=V4L2_TUNER_CAP_LOW;
v->audmode = V4L2_TUNER_MODE_MONO;
v->signal=0xFFFF*gemtek_pci_getsignal( card );
return 0;
}
case VIDIOC_S_TUNER:
{
struct v4l2_tuner *v = arg;
if (v->index > 0)
return -EINVAL;
return 0;
}
case VIDIOC_S_FREQUENCY:
{
struct v4l2_frequency *f = arg;
if ( (f->frequency < GEMTEK_PCI_RANGE_LOW) ||
(f->frequency > GEMTEK_PCI_RANGE_HIGH) )
return -EINVAL;
gemtek_pci_setfrequency( card, f->frequency );
card->current_frequency = f->frequency;
card->mute = FALSE;
return 0;
}
case VIDIOC_QUERYCTRL:
{
struct v4l2_queryctrl *qc = arg;
int i;
for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
if (qc->id && qc->id == radio_qctrl[i].id) {
memcpy(qc, &(radio_qctrl[i]),
sizeof(*qc));
return (0);
}
}
return -EINVAL;
}
case VIDIOC_G_CTRL:
{
struct v4l2_control *ctrl= arg;
switch (ctrl->id) {
case V4L2_CID_AUDIO_MUTE:
ctrl->value=card->mute;
return (0);
case V4L2_CID_AUDIO_VOLUME:
if (card->mute)
ctrl->value=0;
else
ctrl->value=65535;
return (0);
}
return -EINVAL;
}
case VIDIOC_S_CTRL:
{
struct v4l2_control *ctrl= arg;
switch (ctrl->id) {
case V4L2_CID_AUDIO_MUTE:
if (ctrl->value) {
gemtek_pci_mute(card);
} else {
gemtek_pci_unmute(card);
}
return (0);
case V4L2_CID_AUDIO_VOLUME:
if (ctrl->value) {
gemtek_pci_unmute(card);
} else {
gemtek_pci_mute(card);
}
return (0);
}
return -EINVAL;
}
default:
return v4l_compat_translate_ioctl(inode,file,cmd,arg,
gemtek_pci_do_ioctl);
}
}
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 const 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 = 0,
.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 = kzalloc( sizeof( struct gemtek_pci_card ), GFP_KERNEL )) == NULL ) {
printk( KERN_ERR "gemtek_pci: out of memory\n" );
return -ENOMEM;
}
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_register_driver( &gemtek_pci_driver );
}
static void __exit gemtek_pci_cleanup_module( void )
{
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 );
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