drivers/media/video/tvmixer.c

   1 #include <linux/module.h>
   2 #include <linux/kernel.h>
   3 #include <linux/sched.h>
   4 #include <linux/string.h>
   5 #include <linux/timer.h>
   6 #include <linux/delay.h>
   7 #include <linux/errno.h>
   8 #include <linux/slab.h>
   9 #include <linux/i2c.h>
  10 #include <linux/videodev.h>
  11 #include <linux/init.h>
  12 #include <linux/kdev_t.h>
  13 #include <linux/sound.h>
  14 #include <linux/soundcard.h>
  15
  16 #include <asm/semaphore.h>
  17 #include <asm/uaccess.h>
  18
  19
  20 #define DEV_MAX  4
  21
  22 static int devnr = -1;
  23 MODULE_PARM(devnr,"i");
  24
  25 MODULE_AUTHOR("Gerd Knorr");
  26 MODULE_LICENSE("GPL");
  27
  28 /* ----------------------------------------------------------------------- */
  29
  30 struct TVMIXER {
  31         struct i2c_client *dev;
  32         int minor;
  33         int count;
  34 };
  35
  36 static struct TVMIXER devices[DEV_MAX];
  37
  38 static int tvmixer_adapters(struct i2c_adapter *adap);
  39 static int tvmixer_clients(struct i2c_client *client);
  40
  41 /* ----------------------------------------------------------------------- */
  42
  43 static int mix_to_v4l(int i)
  44 {
  45         int r;
  46
  47         r = ((i & 0xff) * 65536 + 50) / 100;
  48         if (r > 65535) r = 65535;
  49         if (r <     0) r =     0;
  50         return r;
  51 }
  52
  53 static int v4l_to_mix(int i)
  54 {
  55         int r;
  56
  57         r = (i * 100 + 32768) / 65536;
  58         if (r > 100) r = 100;
  59         if (r <   0) r =   0;
  60         return r | (r << 8);
  61 }
  62
  63 static int v4l_to_mix2(int l, int r)
  64 {
  65         r = (r * 100 + 32768) / 65536;
  66         if (r > 100) r = 100;
  67         if (r <   0) r =   0;
  68         l = (l * 100 + 32768) / 65536;
  69         if (l > 100) l = 100;
  70         if (l <   0) l =   0;
  71         return (r << 8) | l;
  72 }
  73
  74 static int tvmixer_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
  75 {
  76         struct video_audio va;
  77         int left,right,ret,val = 0;
  78         struct TVMIXER *mix = file->private_data;
  79         struct i2c_client *client = mix->dev;
  80         void __user *argp = (void __user *)arg;
  81         int __user *p = argp;
  82
  83         if (NULL == client)
  84                 return -ENODEV;
  85
  86         if (cmd == SOUND_MIXER_INFO) {
  87                 mixer_info info;
  88                 strlcpy(info.id, "tv card", sizeof(info.id));
  89                 strlcpy(info.name, i2c_clientname(client), sizeof(info.name));
  90                 info.modify_counter = 42 /* FIXME */;
  91                 if (copy_to_user(argp, &info, sizeof(info)))
  92                         return -EFAULT;
  93                 return 0;
  94         }
  95         if (cmd == SOUND_OLD_MIXER_INFO) {
  96                 _old_mixer_info info;
  97                 strlcpy(info.id, "tv card", sizeof(info.id));
  98                 strlcpy(info.name, i2c_clientname(client), sizeof(info.name));
  99                 if (copy_to_user(argp, &info, sizeof(info)))
 100                         return -EFAULT;
 101                 return 0;
 102         }
 103         if (cmd == OSS_GETVERSION)
 104                 return put_user(SOUND_VERSION, p);
 105
 106         if (_SIOC_DIR(cmd) & _SIOC_WRITE)
 107                 if (get_user(val, p))
 108                         return -EFAULT;
 109
 110         /* read state */
 111         memset(&va,0,sizeof(va));
 112         client->driver->command(client,VIDIOCGAUDIO,&va);
 113
 114         switch (cmd) {
 115         case MIXER_READ(SOUND_MIXER_RECMASK):
 116         case MIXER_READ(SOUND_MIXER_CAPS):
 117         case MIXER_READ(SOUND_MIXER_RECSRC):
 118         case MIXER_WRITE(SOUND_MIXER_RECSRC):
 119                 ret = 0;
 120                 break;
 121
 122         case MIXER_READ(SOUND_MIXER_STEREODEVS):
 123                 ret = SOUND_MASK_VOLUME;
 124                 break;
 125         case MIXER_READ(SOUND_MIXER_DEVMASK):
 126                 ret = SOUND_MASK_VOLUME;
 127                 if (va.flags & VIDEO_AUDIO_BASS)
 128                         ret |= SOUND_MASK_BASS;
 129                 if (va.flags & VIDEO_AUDIO_TREBLE)
 130                         ret |= SOUND_MASK_TREBLE;
 131                 break;
 132
 133         case MIXER_WRITE(SOUND_MIXER_VOLUME):
 134                 left  = mix_to_v4l(val);
 135                 right = mix_to_v4l(val >> 8);
 136                 va.volume  = max(left,right);
 137                 va.balance = (32768*min(left,right)) / (va.volume ? va.volume : 1);
 138                 va.balance = (left<right) ? (65535-va.balance) : va.balance;
 139                 if (va.volume)
 140                         va.flags &= ~VIDEO_AUDIO_MUTE;
 141                 client->driver->command(client,VIDIOCSAUDIO,&va);
 142                 client->driver->command(client,VIDIOCGAUDIO,&va);
 143                 /* fall throuth */
 144         case MIXER_READ(SOUND_MIXER_VOLUME):
 145                 left  = (min(65536 - va.balance,32768) *
 146                          va.volume) / 32768;
 147                 right = (min(va.balance,(u16)32768) *
 148                          va.volume) / 32768;
 149                 ret = v4l_to_mix2(left,right);
 150                 break;
 151
 152         case MIXER_WRITE(SOUND_MIXER_BASS):
 153                 va.bass = mix_to_v4l(val);
 154                 client->driver->command(client,VIDIOCSAUDIO,&va);
 155                 client->driver->command(client,VIDIOCGAUDIO,&va);
 156                 /* fall throuth  */
 157         case MIXER_READ(SOUND_MIXER_BASS):
 158                 ret = v4l_to_mix(va.bass);
 159                 break;
 160
 161         case MIXER_WRITE(SOUND_MIXER_TREBLE):
 162                 va.treble = mix_to_v4l(val);
 163                 client->driver->command(client,VIDIOCSAUDIO,&va);
 164                 client->driver->command(client,VIDIOCGAUDIO,&va);
 165                 /* fall throuth */
 166         case MIXER_READ(SOUND_MIXER_TREBLE):
 167                 ret = v4l_to_mix(va.treble);
 168                 break;
 169
 170         default:
 171                 return -EINVAL;
 172         }
 173         if (put_user(ret, p))
 174                 return -EFAULT;
 175         return 0;
 176 }
 177
 178 static int tvmixer_open(struct inode *inode, struct file *file)
 179 {
 180         int i, minor = iminor(inode);
 181         struct TVMIXER *mix = NULL;
 182         struct i2c_client *client = NULL;
 183
 184         for (i = 0; i < DEV_MAX; i++) {
 185                 if (devices[i].minor == minor) {
 186                         mix = devices+i;
 187                         client = mix->dev;
 188                         break;
 189                 }
 190         }
 191
 192         if (NULL == client)
 193                 return -ENODEV;
 194
 195         /* lock bttv in memory while the mixer is in use  */
 196         file->private_data = mix;
 197 #ifndef I2C_PEC
 198         if (client->adapter->inc_use)
 199                 client->adapter->inc_use(client->adapter);
 200 #endif
 201         if (client->adapter->owner)
 202                 try_module_get(client->adapter->owner);
 203         return 0;
 204 }
 205
 206 static int tvmixer_release(struct inode *inode, struct file *file)
 207 {
 208         struct TVMIXER *mix = file->private_data;
 209         struct i2c_client *client;
 210
 211         client = mix->dev;
 212         if (NULL == client) {
 213                 return -ENODEV;
 214         }
 215
 216 #ifndef I2C_PEC
 217         if (client->adapter->dec_use)
 218                 client->adapter->dec_use(client->adapter);
 219 #endif
 220         if (client->adapter->owner)
 221                 module_put(client->adapter->owner);
 222         return 0;
 223 }
 224
 225 static struct i2c_driver driver = {
 226 #ifdef I2C_PEC
 227         .owner           = THIS_MODULE,
 228 #endif
 229         .name            = "tv card mixer driver",
 230         .id              = I2C_DRIVERID_TVMIXER,
 231 #ifdef I2C_DF_DUMMY
 232         .flags           = I2C_DF_DUMMY,
 233 #else
 234         .flags           = I2C_DF_NOTIFY,
 235         .detach_adapter  = tvmixer_adapters,
 236 #endif
 237         .attach_adapter  = tvmixer_adapters,
 238         .detach_client   = tvmixer_clients,
 239 };
 240
 241 static struct file_operations tvmixer_fops = {
 242         .owner          = THIS_MODULE,
 243         .llseek         = no_llseek,
 244         .ioctl          = tvmixer_ioctl,
 245         .open           = tvmixer_open,
 246         .release        = tvmixer_release,
 247 };
 248
 249 /* ----------------------------------------------------------------------- */
 250
 251 static int tvmixer_adapters(struct i2c_adapter *adap)
 252 {
 253         struct list_head  *item;
 254         struct i2c_client *client;
 255
 256         list_for_each(item,&adap->clients) {
 257                 client = list_entry(item, struct i2c_client, list);
 258                 tvmixer_clients(client);
 259         }
 260         return 0;
 261 }
 262
 263 static int tvmixer_clients(struct i2c_client *client)
 264 {
 265         struct video_audio va;
 266         int i,minor;
 267
 268 #ifdef I2C_CLASS_TV_ANALOG
 269         if (!(client->adapter->class & I2C_CLASS_TV_ANALOG))
 270                 return -1;
 271 #else
 272         /* TV card ??? */
 273         switch (client->adapter->id) {
 274         case I2C_ALGO_BIT | I2C_HW_SMBUS_VOODOO3:
 275         case I2C_ALGO_BIT | I2C_HW_B_BT848:
 276         case I2C_ALGO_BIT | I2C_HW_B_RIVA:
 277                 /* ok, have a look ... */
 278                 break;
 279         default:
 280                 /* ignore that one */
 281                 return -1;
 282         }
 283 #endif
 284
 285         /* unregister ?? */
 286         for (i = 0; i < DEV_MAX; i++) {
 287                 if (devices[i].dev == client) {
 288                         /* unregister */
 289                         unregister_sound_mixer(devices[i].minor);
 290                         devices[i].dev = NULL;
 291                         devices[i].minor = -1;
 292                         printk("tvmixer: %s unregistered (#1)\n",
 293                                i2c_clientname(client));
 294                         return 0;
 295                 }
 296         }
 297
 298         /* look for a free slot */
 299         for (i = 0; i < DEV_MAX; i++)
 300                 if (NULL == devices[i].dev)
 301                         break;
 302         if (i == DEV_MAX) {
 303                 printk(KERN_WARNING "tvmixer: DEV_MAX too small\n");
 304                 return -1;
 305         }
 306
 307         /* audio chip with mixer ??? */
 308         if (NULL == client->driver->command)
 309                 return -1;
 310         memset(&va,0,sizeof(va));
 311         if (0 != client->driver->command(client,VIDIOCGAUDIO,&va))
 312                 return -1;
 313         if (0 == (va.flags & VIDEO_AUDIO_VOLUME))
 314                 return -1;
 315
 316         /* everything is fine, register */
 317         if ((minor = register_sound_mixer(&tvmixer_fops,devnr)) < 0) {
 318                 printk(KERN_ERR "tvmixer: cannot allocate mixer device\n");
 319                 return -1;
 320         }
 321
 322         devices[i].minor = minor;
 323         devices[i].count = 0;
 324         devices[i].dev   = client;
 325         printk("tvmixer: %s (%s) registered with minor %d\n",
 326                client->name,client->adapter->name,minor);
 327
 328         return 0;
 329 }
 330
 331 /* ----------------------------------------------------------------------- */
 332
 333 static int __init tvmixer_init_module(void)
 334 {
 335         int i;
 336
 337         for (i = 0; i < DEV_MAX; i++)
 338                 devices[i].minor = -1;
 339
 340         return i2c_add_driver(&driver);
 341 }
 342
 343 static void __exit tvmixer_cleanup_module(void)
 344 {
 345         int i;
 346
 347         i2c_del_driver(&driver);
 348         for (i = 0; i < DEV_MAX; i++) {
 349                 if (devices[i].minor != -1) {
 350                         unregister_sound_mixer(devices[i].minor);
 351                         printk("tvmixer: %s unregistered (#2)\n",
 352                                i2c_clientname(devices[i].dev));
 353                 }
 354         }
 355 }
 356
 357 module_init(tvmixer_init_module);
 358 module_exit(tvmixer_cleanup_module);
 359
 360 /*
 361  * Overrides for Emacs so that we follow Linus's tabbing style.
 362  * ---------------------------------------------------------------------------
 363  * Local variables:
 364  * c-basic-offset: 8
 365  * End:
 366  */