drivers/media/radio/radio-rtrack2.c

   1 /* RadioTrack II driver for Linux radio support (C) 1998 Ben Pfaff
   2  *
   3  * Based on RadioTrack I/RadioReveal (C) 1997 M. Kirkwood
   4  * Converted to new API by Alan Cox <Alan.Cox@linux.org>
   5  * Various bugfixes and enhancements by Russell Kroll <rkroll@exploits.org>
   6  *
   7  * TODO: Allow for more than one of these foolish entities :-)
   8  *
   9  * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
  10  */
  11
  12 #include <linux/module.h>       /* Modules                      */
  13 #include <linux/init.h>         /* Initdata                     */
  14 #include <linux/ioport.h>       /* request_region               */
  15 #include <linux/delay.h>        /* udelay                       */
  16 #include <asm/io.h>             /* outb, outb_p                 */
  17 #include <asm/uaccess.h>        /* copy to/from user            */
  18 #include <linux/videodev2.h>    /* kernel radio structs         */
  19 #include <media/v4l2-common.h>
  20 #include <media/v4l2-ioctl.h>
  21 #include <linux/spinlock.h>
  22
  23 #include <linux/version.h>      /* for KERNEL_VERSION MACRO     */
  24 #define RADIO_VERSION KERNEL_VERSION(0,0,2)
  25
  26 static struct v4l2_queryctrl radio_qctrl[] = {
  27         {
  28                 .id            = V4L2_CID_AUDIO_MUTE,
  29                 .name          = "Mute",
  30                 .minimum       = 0,
  31                 .maximum       = 1,
  32                 .default_value = 1,
  33                 .type          = V4L2_CTRL_TYPE_BOOLEAN,
  34         },{
  35                 .id            = V4L2_CID_AUDIO_VOLUME,
  36                 .name          = "Volume",
  37                 .minimum       = 0,
  38                 .maximum       = 65535,
  39                 .step          = 65535,
  40                 .default_value = 0xff,
  41                 .type          = V4L2_CTRL_TYPE_INTEGER,
  42         }
  43 };
  44
  45 #ifndef CONFIG_RADIO_RTRACK2_PORT
  46 #define CONFIG_RADIO_RTRACK2_PORT -1
  47 #endif
  48
  49 static int io = CONFIG_RADIO_RTRACK2_PORT;
  50 static int radio_nr = -1;
  51 static spinlock_t lock;
  52
  53 struct rt_device
  54 {
  55         unsigned long in_use;
  56         int port;
  57         unsigned long curfreq;
  58         int muted;
  59 };
  60
  61
  62 /* local things */
  63
  64 static void rt_mute(struct rt_device *dev)
  65 {
  66         if(dev->muted)
  67                 return;
  68         spin_lock(&lock);
  69         outb(1, io);
  70         spin_unlock(&lock);
  71         dev->muted = 1;
  72 }
  73
  74 static void rt_unmute(struct rt_device *dev)
  75 {
  76         if(dev->muted == 0)
  77                 return;
  78         spin_lock(&lock);
  79         outb(0, io);
  80         spin_unlock(&lock);
  81         dev->muted = 0;
  82 }
  83
  84 static void zero(void)
  85 {
  86         outb_p(1, io);
  87         outb_p(3, io);
  88         outb_p(1, io);
  89 }
  90
  91 static void one(void)
  92 {
  93         outb_p(5, io);
  94         outb_p(7, io);
  95         outb_p(5, io);
  96 }
  97
  98 static int rt_setfreq(struct rt_device *dev, unsigned long freq)
  99 {
 100         int i;
 101
 102         freq = freq / 200 + 856;
 103
 104         spin_lock(&lock);
 105
 106         outb_p(0xc8, io);
 107         outb_p(0xc9, io);
 108         outb_p(0xc9, io);
 109
 110         for (i = 0; i < 10; i++)
 111                 zero ();
 112
 113         for (i = 14; i >= 0; i--)
 114                 if (freq & (1 << i))
 115                         one ();
 116                 else
 117                         zero ();
 118
 119         outb_p(0xc8, io);
 120         if (!dev->muted)
 121                 outb_p(0, io);
 122
 123         spin_unlock(&lock);
 124         return 0;
 125 }
 126
 127 static int vidioc_querycap(struct file *file, void *priv,
 128                                 struct v4l2_capability *v)
 129 {
 130         strlcpy(v->driver, "radio-rtrack2", sizeof(v->driver));
 131         strlcpy(v->card, "RadioTrack II", sizeof(v->card));
 132         sprintf(v->bus_info, "ISA");
 133         v->version = RADIO_VERSION;
 134         v->capabilities = V4L2_CAP_TUNER;
 135         return 0;
 136 }
 137
 138 static int vidioc_s_tuner(struct file *file, void *priv,
 139                                 struct v4l2_tuner *v)
 140 {
 141         if (v->index > 0)
 142                 return -EINVAL;
 143
 144         return 0;
 145 }
 146
 147 static int rt_getsigstr(struct rt_device *dev)
 148 {
 149         if (inb(io) & 2)        /* bit set = no signal present  */
 150                 return 0;
 151         return 1;               /* signal present               */
 152 }
 153
 154 static int vidioc_g_tuner(struct file *file, void *priv,
 155                                 struct v4l2_tuner *v)
 156 {
 157         struct video_device *dev = video_devdata(file);
 158         struct rt_device *rt = dev->priv;
 159
 160         if (v->index > 0)
 161                 return -EINVAL;
 162
 163         strcpy(v->name, "FM");
 164         v->type = V4L2_TUNER_RADIO;
 165         v->rangelow = (88*16000);
 166         v->rangehigh = (108*16000);
 167         v->rxsubchans = V4L2_TUNER_SUB_MONO;
 168         v->capability = V4L2_TUNER_CAP_LOW;
 169         v->audmode = V4L2_TUNER_MODE_MONO;
 170         v->signal = 0xFFFF*rt_getsigstr(rt);
 171         return 0;
 172 }
 173
 174 static int vidioc_s_frequency(struct file *file, void *priv,
 175                                 struct v4l2_frequency *f)
 176 {
 177         struct video_device *dev = video_devdata(file);
 178         struct rt_device *rt = dev->priv;
 179
 180         rt->curfreq = f->frequency;
 181         rt_setfreq(rt, rt->curfreq);
 182         return 0;
 183 }
 184
 185 static int vidioc_g_frequency(struct file *file, void *priv,
 186                                 struct v4l2_frequency *f)
 187 {
 188         struct video_device *dev = video_devdata(file);
 189         struct rt_device *rt = dev->priv;
 190
 191         f->type = V4L2_TUNER_RADIO;
 192         f->frequency = rt->curfreq;
 193         return 0;
 194 }
 195
 196 static int vidioc_queryctrl(struct file *file, void *priv,
 197                                 struct v4l2_queryctrl *qc)
 198 {
 199         int i;
 200
 201         for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
 202                 if (qc->id && qc->id == radio_qctrl[i].id) {
 203                         memcpy(qc, &(radio_qctrl[i]),
 204                                                 sizeof(*qc));
 205                         return 0;
 206                 }
 207         }
 208         return -EINVAL;
 209 }
 210
 211 static int vidioc_g_ctrl(struct file *file, void *priv,
 212                                 struct v4l2_control *ctrl)
 213 {
 214         struct video_device *dev = video_devdata(file);
 215         struct rt_device *rt = dev->priv;
 216
 217         switch (ctrl->id) {
 218         case V4L2_CID_AUDIO_MUTE:
 219                 ctrl->value = rt->muted;
 220                 return 0;
 221         case V4L2_CID_AUDIO_VOLUME:
 222                 if (rt->muted)
 223                         ctrl->value = 0;
 224                 else
 225                         ctrl->value = 65535;
 226                 return 0;
 227         }
 228         return -EINVAL;
 229 }
 230
 231 static int vidioc_s_ctrl(struct file *file, void *priv,
 232                                 struct v4l2_control *ctrl)
 233 {
 234         struct video_device *dev = video_devdata(file);
 235         struct rt_device *rt = dev->priv;
 236
 237         switch (ctrl->id) {
 238         case V4L2_CID_AUDIO_MUTE:
 239                 if (ctrl->value)
 240                         rt_mute(rt);
 241                 else
 242                         rt_unmute(rt);
 243                 return 0;
 244         case V4L2_CID_AUDIO_VOLUME:
 245                 if (ctrl->value)
 246                         rt_unmute(rt);
 247                 else
 248                         rt_mute(rt);
 249                 return 0;
 250         }
 251         return -EINVAL;
 252 }
 253
 254 static int vidioc_g_audio(struct file *file, void *priv,
 255                                 struct v4l2_audio *a)
 256 {
 257         if (a->index > 1)
 258                 return -EINVAL;
 259
 260         strcpy(a->name, "Radio");
 261         a->capability = V4L2_AUDCAP_STEREO;
 262         return 0;
 263 }
 264
 265 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 266 {
 267         *i = 0;
 268         return 0;
 269 }
 270
 271 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 272 {
 273         if (i != 0)
 274                 return -EINVAL;
 275         return 0;
 276 }
 277
 278 static int vidioc_s_audio(struct file *file, void *priv,
 279                                 struct v4l2_audio *a)
 280 {
 281         if (a->index != 0)
 282                 return -EINVAL;
 283         return 0;
 284 }
 285
 286 static struct rt_device rtrack2_unit;
 287
 288 static int rtrack2_exclusive_open(struct inode *inode, struct file *file)
 289 {
 290         return test_and_set_bit(0, &rtrack2_unit.in_use) ? -EBUSY : 0;
 291 }
 292
 293 static int rtrack2_exclusive_release(struct inode *inode, struct file *file)
 294 {
 295         clear_bit(0, &rtrack2_unit.in_use);
 296         return 0;
 297 }
 298
 299 static const struct file_operations rtrack2_fops = {
 300         .owner          = THIS_MODULE,
 301         .open           = rtrack2_exclusive_open,
 302         .release        = rtrack2_exclusive_release,
 303         .ioctl          = video_ioctl2,
 304 #ifdef CONFIG_COMPAT
 305         .compat_ioctl   = v4l_compat_ioctl32,
 306 #endif
 307         .llseek         = no_llseek,
 308 };
 309
 310 static const struct v4l2_ioctl_ops rtrack2_ioctl_ops = {
 311         .vidioc_querycap    = vidioc_querycap,
 312         .vidioc_g_tuner     = vidioc_g_tuner,
 313         .vidioc_s_tuner     = vidioc_s_tuner,
 314         .vidioc_g_frequency = vidioc_g_frequency,
 315         .vidioc_s_frequency = vidioc_s_frequency,
 316         .vidioc_queryctrl   = vidioc_queryctrl,
 317         .vidioc_g_ctrl      = vidioc_g_ctrl,
 318         .vidioc_s_ctrl      = vidioc_s_ctrl,
 319         .vidioc_g_audio     = vidioc_g_audio,
 320         .vidioc_s_audio     = vidioc_s_audio,
 321         .vidioc_g_input     = vidioc_g_input,
 322         .vidioc_s_input     = vidioc_s_input,
 323 };
 324
 325 static struct video_device rtrack2_radio = {
 326         .name           = "RadioTrack II radio",
 327         .fops           = &rtrack2_fops,
 328         .ioctl_ops      = &rtrack2_ioctl_ops,
 329         .release        = video_device_release_empty,
 330 };
 331
 332 static int __init rtrack2_init(void)
 333 {
 334         if(io==-1)
 335         {
 336                 printk(KERN_ERR "You must set an I/O address with io=0x20c or io=0x30c\n");
 337                 return -EINVAL;
 338         }
 339         if (!request_region(io, 4, "rtrack2"))
 340         {
 341                 printk(KERN_ERR "rtrack2: port 0x%x already in use\n", io);
 342                 return -EBUSY;
 343         }
 344
 345         rtrack2_radio.priv=&rtrack2_unit;
 346
 347         spin_lock_init(&lock);
 348         if (video_register_device(&rtrack2_radio, VFL_TYPE_RADIO, radio_nr) < 0) {
 349                 release_region(io, 4);
 350                 return -EINVAL;
 351         }
 352
 353         printk(KERN_INFO "AIMSlab Radiotrack II card driver.\n");
 354
 355         /* mute card - prevents noisy bootups */
 356         outb(1, io);
 357         rtrack2_unit.muted = 1;
 358
 359         return 0;
 360 }
 361
 362 MODULE_AUTHOR("Ben Pfaff");
 363 MODULE_DESCRIPTION("A driver for the RadioTrack II radio card.");
 364 MODULE_LICENSE("GPL");
 365
 366 module_param(io, int, 0);
 367 MODULE_PARM_DESC(io, "I/O address of the RadioTrack card (0x20c or 0x30c)");
 368 module_param(radio_nr, int, 0);
 369
 370 static void __exit rtrack2_cleanup_module(void)
 371 {
 372         video_unregister_device(&rtrack2_radio);
 373         release_region(io,4);
 374 }
 375
 376 module_init(rtrack2_init);
 377 module_exit(rtrack2_cleanup_module);
 378
 379 /*
 380   Local variables:
 381   compile-command: "mmake"
 382   End:
 383 */