diff options
Diffstat (limited to 'drivers/media/video/tvmixer.c')
-rw-r--r-- | drivers/media/video/tvmixer.c | 367 |
1 files changed, 367 insertions, 0 deletions
diff --git a/drivers/media/video/tvmixer.c b/drivers/media/video/tvmixer.c new file mode 100644 index 0000000..eafd706 --- /dev/null +++ b/drivers/media/video/tvmixer.c @@ -0,0 +1,367 @@ +#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, i2c_clientname(client), 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, i2c_clientname(client), 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, +#ifdef I2C_DF_DUMMY + .flags = I2C_DF_DUMMY, +#else + .flags = I2C_DF_NOTIFY, + .detach_adapter = tvmixer_adapters, +#endif + .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_ALGO_BIT | I2C_HW_SMBUS_VOODOO3: + case I2C_ALGO_BIT | I2C_HW_B_BT848: + case I2C_ALGO_BIT | 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", + i2c_clientname(client)); + 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", + i2c_clientname(devices[i].dev)); + } + } +} + +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: + */ |