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