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linux/drivers/media/video/tvmixer.c
Jean Delvare 8a9947552d [PATCH] i2c: Drop i2c_driver.flags, 2 of 3 
Just about every i2c chip driver sets the I2C_DF_NOTIFY flag, so we
can simply make it the default and drop the flag. If any driver really
doesn't want to be notified when i2c adapters are added, that driver
can simply omit to set .attach_adapter. This approach is also more
robust as it prevents accidental NULL pointer dereferences.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2006-01-05 22:16:21 -08:00

366 lines
8.2 KiB
C
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/*
*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/videodev.h>
#include <linux/init.h>
#include <linux/kdev_t.h>
#include <linux/sound.h>
#include <linux/soundcard.h>
#include <asm/semaphore.h>
#include <asm/uaccess.h>
#define DEV_MAX 4
static int devnr = -1;
module_param(devnr, int, 0644);
MODULE_AUTHOR("Gerd Knorr");
MODULE_LICENSE("GPL");
/* ----------------------------------------------------------------------- */
struct TVMIXER {
struct i2c_client *dev;
int minor;
int count;
};
static struct TVMIXER devices[DEV_MAX];
static int tvmixer_adapters(struct i2c_adapter *adap);
static int tvmixer_clients(struct i2c_client *client);
/* ----------------------------------------------------------------------- */
static int mix_to_v4l(int i)
{
int r;
r = ((i & 0xff) * 65536 + 50) / 100;
if (r > 65535) r = 65535;
if (r < 0) r = 0;
return r;
}
static int v4l_to_mix(int i)
{
int r;
r = (i * 100 + 32768) / 65536;
if (r > 100) r = 100;
if (r < 0) r = 0;
return r | (r << 8);
}
static int v4l_to_mix2(int l, int r)
{
r = (r * 100 + 32768) / 65536;
if (r > 100) r = 100;
if (r < 0) r = 0;
l = (l * 100 + 32768) / 65536;
if (l > 100) l = 100;
if (l < 0) l = 0;
return (r << 8) | l;
}
static int tvmixer_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
{
struct video_audio va;
int left,right,ret,val = 0;
struct TVMIXER *mix = file->private_data;
struct i2c_client *client = mix->dev;
void __user *argp = (void __user *)arg;
int __user *p = argp;
if (NULL == client)
return -ENODEV;
if (cmd == SOUND_MIXER_INFO) {
mixer_info info;
strlcpy(info.id, "tv card", sizeof(info.id));
strlcpy(info.name, client->name, sizeof(info.name));
info.modify_counter = 42 /* FIXME */;
if (copy_to_user(argp, &info, sizeof(info)))
return -EFAULT;
return 0;
}
if (cmd == SOUND_OLD_MIXER_INFO) {
_old_mixer_info info;
strlcpy(info.id, "tv card", sizeof(info.id));
strlcpy(info.name, client->name, sizeof(info.name));
if (copy_to_user(argp, &info, sizeof(info)))
return -EFAULT;
return 0;
}
if (cmd == OSS_GETVERSION)
return put_user(SOUND_VERSION, p);
if (_SIOC_DIR(cmd) & _SIOC_WRITE)
if (get_user(val, p))
return -EFAULT;
/* read state */
memset(&va,0,sizeof(va));
client->driver->command(client,VIDIOCGAUDIO,&va);
switch (cmd) {
case MIXER_READ(SOUND_MIXER_RECMASK):
case MIXER_READ(SOUND_MIXER_CAPS):
case MIXER_READ(SOUND_MIXER_RECSRC):
case MIXER_WRITE(SOUND_MIXER_RECSRC):
ret = 0;
break;
case MIXER_READ(SOUND_MIXER_STEREODEVS):
ret = SOUND_MASK_VOLUME;
break;
case MIXER_READ(SOUND_MIXER_DEVMASK):
ret = SOUND_MASK_VOLUME;
if (va.flags & VIDEO_AUDIO_BASS)
ret |= SOUND_MASK_BASS;
if (va.flags & VIDEO_AUDIO_TREBLE)
ret |= SOUND_MASK_TREBLE;
break;
case MIXER_WRITE(SOUND_MIXER_VOLUME):
left = mix_to_v4l(val);
right = mix_to_v4l(val >> 8);
va.volume = max(left,right);
va.balance = (32768*min(left,right)) / (va.volume ? va.volume : 1);
va.balance = (left<right) ? (65535-va.balance) : va.balance;
if (va.volume)
va.flags &= ~VIDEO_AUDIO_MUTE;
client->driver->command(client,VIDIOCSAUDIO,&va);
client->driver->command(client,VIDIOCGAUDIO,&va);
/* fall throuth */
case MIXER_READ(SOUND_MIXER_VOLUME):
left = (min(65536 - va.balance,32768) *
va.volume) / 32768;
right = (min(va.balance,(u16)32768) *
va.volume) / 32768;
ret = v4l_to_mix2(left,right);
break;
case MIXER_WRITE(SOUND_MIXER_BASS):
va.bass = mix_to_v4l(val);
client->driver->command(client,VIDIOCSAUDIO,&va);
client->driver->command(client,VIDIOCGAUDIO,&va);
/* fall throuth */
case MIXER_READ(SOUND_MIXER_BASS):
ret = v4l_to_mix(va.bass);
break;
case MIXER_WRITE(SOUND_MIXER_TREBLE):
va.treble = mix_to_v4l(val);
client->driver->command(client,VIDIOCSAUDIO,&va);
client->driver->command(client,VIDIOCGAUDIO,&va);
/* fall throuth */
case MIXER_READ(SOUND_MIXER_TREBLE):
ret = v4l_to_mix(va.treble);
break;
default:
return -EINVAL;
}
if (put_user(ret, p))
return -EFAULT;
return 0;
}
static int tvmixer_open(struct inode *inode, struct file *file)
{
int i, minor = iminor(inode);
struct TVMIXER *mix = NULL;
struct i2c_client *client = NULL;
for (i = 0; i < DEV_MAX; i++) {
if (devices[i].minor == minor) {
mix = devices+i;
client = mix->dev;
break;
}
}
if (NULL == client)
return -ENODEV;
/* lock bttv in memory while the mixer is in use */
file->private_data = mix;
#ifndef I2C_PEC
if (client->adapter->inc_use)
client->adapter->inc_use(client->adapter);
#endif
if (client->adapter->owner)
try_module_get(client->adapter->owner);
return 0;
}
static int tvmixer_release(struct inode *inode, struct file *file)
{
struct TVMIXER *mix = file->private_data;
struct i2c_client *client;
client = mix->dev;
if (NULL == client) {
return -ENODEV;
}
#ifndef I2C_PEC
if (client->adapter->dec_use)
client->adapter->dec_use(client->adapter);
#endif
if (client->adapter->owner)
module_put(client->adapter->owner);
return 0;
}
static struct i2c_driver driver = {
#ifdef I2C_PEC
.owner = THIS_MODULE,
#endif
.name = "tv card mixer driver",
.id = I2C_DRIVERID_TVMIXER,
.detach_adapter = tvmixer_adapters,
.attach_adapter = tvmixer_adapters,
.detach_client = tvmixer_clients,
};
static struct file_operations tvmixer_fops = {
.owner = THIS_MODULE,
.llseek = no_llseek,
.ioctl = tvmixer_ioctl,
.open = tvmixer_open,
.release = tvmixer_release,
};
/* ----------------------------------------------------------------------- */
static int tvmixer_adapters(struct i2c_adapter *adap)
{
struct list_head *item;
struct i2c_client *client;
list_for_each(item,&adap->clients) {
client = list_entry(item, struct i2c_client, list);
tvmixer_clients(client);
}
return 0;
}
static int tvmixer_clients(struct i2c_client *client)
{
struct video_audio va;
int i,minor;
#ifdef I2C_CLASS_TV_ANALOG
if (!(client->adapter->class & I2C_CLASS_TV_ANALOG))
return -1;
#else
/* TV card ??? */
switch (client->adapter->id) {
case I2C_HW_SMBUS_VOODOO3:
case I2C_HW_B_BT848:
case I2C_HW_B_RIVA:
/* ok, have a look ... */
break;
default:
/* ignore that one */
return -1;
}
#endif
/* unregister ?? */
for (i = 0; i < DEV_MAX; i++) {
if (devices[i].dev == client) {
/* unregister */
unregister_sound_mixer(devices[i].minor);
devices[i].dev = NULL;
devices[i].minor = -1;
printk("tvmixer: %s unregistered (#1)\n",
client->name);
return 0;
}
}
/* look for a free slot */
for (i = 0; i < DEV_MAX; i++)
if (NULL == devices[i].dev)
break;
if (i == DEV_MAX) {
printk(KERN_WARNING "tvmixer: DEV_MAX too small\n");
return -1;
}
/* audio chip with mixer ??? */
if (NULL == client->driver->command)
return -1;
memset(&va,0,sizeof(va));
if (0 != client->driver->command(client,VIDIOCGAUDIO,&va))
return -1;
if (0 == (va.flags & VIDEO_AUDIO_VOLUME))
return -1;
/* everything is fine, register */
if ((minor = register_sound_mixer(&tvmixer_fops,devnr)) < 0) {
printk(KERN_ERR "tvmixer: cannot allocate mixer device\n");
return -1;
}
devices[i].minor = minor;
devices[i].count = 0;
devices[i].dev = client;
printk("tvmixer: %s (%s) registered with minor %d\n",
client->name,client->adapter->name,minor);
return 0;
}
/* ----------------------------------------------------------------------- */
static int __init tvmixer_init_module(void)
{
int i;
for (i = 0; i < DEV_MAX; i++)
devices[i].minor = -1;
return i2c_add_driver(&driver);
}
static void __exit tvmixer_cleanup_module(void)
{
int i;
i2c_del_driver(&driver);
for (i = 0; i < DEV_MAX; i++) {
if (devices[i].minor != -1) {
unregister_sound_mixer(devices[i].minor);
printk("tvmixer: %s unregistered (#2)\n",
devices[i].dev->name);
}
}
}
module_init(tvmixer_init_module);
module_exit(tvmixer_cleanup_module);
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* ---------------------------------------------------------------------------
* Local variables:
* c-basic-offset: 8
* End:
*/
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