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         int port;
  56         unsigned long curfreq;
  57         int muted;
  58 };
  59
  60
  61 /* local things */
  62
  63 static void rt_mute(struct rt_device *dev)
  64 {
  65         if(dev->muted)
  66                 return;
  67         spin_lock(&lock);
  68         outb(1, io);
  69         spin_unlock(&lock);
  70         dev->muted = 1;
  71 }
  72
  73 static void rt_unmute(struct rt_device *dev)
  74 {
  75         if(dev->muted == 0)
  76                 return;
  77         spin_lock(&lock);
  78         outb(0, io);
  79         spin_unlock(&lock);
  80         dev->muted = 0;
  81 }
  82
  83 static void zero(void)
  84 {
  85         outb_p(1, io);
  86         outb_p(3, io);
  87         outb_p(1, io);
  88 }
  89
  90 static void one(void)
  91 {
  92         outb_p(5, io);
  93         outb_p(7, io);
  94         outb_p(5, io);
  95 }
  96
  97 static int rt_setfreq(struct rt_device *dev, unsigned long freq)
  98 {
  99         int i;
 100
 101         freq = freq / 200 + 856;
 102
 103         spin_lock(&lock);
 104
 105         outb_p(0xc8, io);
 106         outb_p(0xc9, io);
 107         outb_p(0xc9, io);
 108
 109         for (i = 0; i < 10; i++)
 110                 zero ();
 111
 112         for (i = 14; i >= 0; i--)
 113                 if (freq & (1 << i))
 114                         one ();
 115                 else
 116                         zero ();
 117
 118         outb_p(0xc8, io);
 119         if (!dev->muted)
 120                 outb_p(0, io);
 121
 122         spin_unlock(&lock);
 123         return 0;
 124 }
 125
 126 static int vidioc_querycap(struct file *file, void *priv,
 127                                 struct v4l2_capability *v)
 128 {
 129         strlcpy(v->driver, "radio-rtrack2", sizeof(v->driver));
 130         strlcpy(v->card, "RadioTrack II", sizeof(v->card));
 131         sprintf(v->bus_info, "ISA");
 132         v->version = RADIO_VERSION;
 133         v->capabilities = V4L2_CAP_TUNER;
 134         return 0;
 135 }
 136
 137 static int vidioc_s_tuner(struct file *file, void *priv,
 138                                 struct v4l2_tuner *v)
 139 {
 140         if (v->index > 0)
 141                 return -EINVAL;
 142
 143         return 0;
 144 }
 145
 146 static int rt_getsigstr(struct rt_device *dev)
 147 {
 148         if (inb(io) & 2)        /* bit set = no signal present  */
 149                 return 0;
 150         return 1;               /* signal present               */
 151 }
 152
 153 static int vidioc_g_tuner(struct file *file, void *priv,
 154                                 struct v4l2_tuner *v)
 155 {
 156         struct video_device *dev = video_devdata(file);
 157         struct rt_device *rt = dev->priv;
 158
 159         if (v->index > 0)
 160                 return -EINVAL;
 161
 162         strcpy(v->name, "FM");
 163         v->type = V4L2_TUNER_RADIO;
 164         v->rangelow = (88*16000);
 165         v->rangehigh = (108*16000);
 166         v->rxsubchans = V4L2_TUNER_SUB_MONO;
 167         v->capability = V4L2_TUNER_CAP_LOW;
 168         v->audmode = V4L2_TUNER_MODE_MONO;
 169         v->signal = 0xFFFF*rt_getsigstr(rt);
 170         return 0;
 171 }
 172
 173 static int vidioc_s_frequency(struct file *file, void *priv,
 174                                 struct v4l2_frequency *f)
 175 {
 176         struct video_device *dev = video_devdata(file);
 177         struct rt_device *rt = dev->priv;
 178
 179         rt->curfreq = f->frequency;
 180         rt_setfreq(rt, rt->curfreq);
 181         return 0;
 182 }
 183
 184 static int vidioc_g_frequency(struct file *file, void *priv,
 185                                 struct v4l2_frequency *f)
 186 {
 187         struct video_device *dev = video_devdata(file);
 188         struct rt_device *rt = dev->priv;
 189
 190         f->type = V4L2_TUNER_RADIO;
 191         f->frequency = rt->curfreq;
 192         return 0;
 193 }
 194
 195 static int vidioc_queryctrl(struct file *file, void *priv,
 196                                 struct v4l2_queryctrl *qc)
 197 {
 198         int i;
 199
 200         for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
 201                 if (qc->id && qc->id == radio_qctrl[i].id) {
 202                         memcpy(qc, &(radio_qctrl[i]),
 203                                                 sizeof(*qc));
 204                         return 0;
 205                 }
 206         }
 207         return -EINVAL;
 208 }
 209
 210 static int vidioc_g_ctrl(struct file *file, void *priv,
 211                                 struct v4l2_control *ctrl)
 212 {
 213         struct video_device *dev = video_devdata(file);
 214         struct rt_device *rt = dev->priv;
 215
 216         switch (ctrl->id) {
 217         case V4L2_CID_AUDIO_MUTE:
 218                 ctrl->value = rt->muted;
 219                 return 0;
 220         case V4L2_CID_AUDIO_VOLUME:
 221                 if (rt->muted)
 222                         ctrl->value = 0;
 223                 else
 224                         ctrl->value = 65535;
 225                 return 0;
 226         }
 227         return -EINVAL;
 228 }
 229
 230 static int vidioc_s_ctrl(struct file *file, void *priv,
 231                                 struct v4l2_control *ctrl)
 232 {
 233         struct video_device *dev = video_devdata(file);
 234         struct rt_device *rt = dev->priv;
 235
 236         switch (ctrl->id) {
 237         case V4L2_CID_AUDIO_MUTE:
 238                 if (ctrl->value)
 239                         rt_mute(rt);
 240                 else
 241                         rt_unmute(rt);
 242                 return 0;
 243         case V4L2_CID_AUDIO_VOLUME:
 244                 if (ctrl->value)
 245                         rt_unmute(rt);
 246                 else
 247                         rt_mute(rt);
 248                 return 0;
 249         }
 250         return -EINVAL;
 251 }
 252
 253 static int vidioc_g_audio(struct file *file, void *priv,
 254                                 struct v4l2_audio *a)
 255 {
 256         if (a->index > 1)
 257                 return -EINVAL;
 258
 259         strcpy(a->name, "Radio");
 260         a->capability = V4L2_AUDCAP_STEREO;
 261         return 0;
 262 }
 263
 264 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 265 {
 266         *i = 0;
 267         return 0;
 268 }
 269
 270 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 271 {
 272         if (i != 0)
 273                 return -EINVAL;
 274         return 0;
 275 }
 276
 277 static int vidioc_s_audio(struct file *file, void *priv,
 278                                 struct v4l2_audio *a)
 279 {
 280         if (a->index != 0)
 281                 return -EINVAL;
 282         return 0;
 283 }
 284
 285 static struct rt_device rtrack2_unit;
 286
 287 static const struct file_operations rtrack2_fops = {
 288         .owner          = THIS_MODULE,
 289         .open           = video_exclusive_open,
 290         .release        = video_exclusive_release,
 291         .ioctl          = video_ioctl2,
 292 #ifdef CONFIG_COMPAT
 293         .compat_ioctl   = v4l_compat_ioctl32,
 294 #endif
 295         .llseek         = no_llseek,
 296 };
 297
 298 static const struct v4l2_ioctl_ops rtrack2_ioctl_ops = {
 299         .vidioc_querycap    = vidioc_querycap,
 300         .vidioc_g_tuner     = vidioc_g_tuner,
 301         .vidioc_s_tuner     = vidioc_s_tuner,
 302         .vidioc_g_frequency = vidioc_g_frequency,
 303         .vidioc_s_frequency = vidioc_s_frequency,
 304         .vidioc_queryctrl   = vidioc_queryctrl,
 305         .vidioc_g_ctrl      = vidioc_g_ctrl,
 306         .vidioc_s_ctrl      = vidioc_s_ctrl,
 307         .vidioc_g_audio     = vidioc_g_audio,
 308         .vidioc_s_audio     = vidioc_s_audio,
 309         .vidioc_g_input     = vidioc_g_input,
 310         .vidioc_s_input     = vidioc_s_input,
 311 };
 312
 313 static struct video_device rtrack2_radio = {
 314         .name           = "RadioTrack II radio",
 315         .fops           = &rtrack2_fops,
 316         .ioctl_ops      = &rtrack2_ioctl_ops,
 317 };
 318
 319 static int __init rtrack2_init(void)
 320 {
 321         if(io==-1)
 322         {
 323                 printk(KERN_ERR "You must set an I/O address with io=0x20c or io=0x30c\n");
 324                 return -EINVAL;
 325         }
 326         if (!request_region(io, 4, "rtrack2"))
 327         {
 328                 printk(KERN_ERR "rtrack2: port 0x%x already in use\n", io);
 329                 return -EBUSY;
 330         }
 331
 332         rtrack2_radio.priv=&rtrack2_unit;
 333
 334         spin_lock_init(&lock);
 335         if(video_register_device(&rtrack2_radio, VFL_TYPE_RADIO, radio_nr)==-1)
 336         {
 337                 release_region(io, 4);
 338                 return -EINVAL;
 339         }
 340
 341         printk(KERN_INFO "AIMSlab Radiotrack II card driver.\n");
 342
 343         /* mute card - prevents noisy bootups */
 344         outb(1, io);
 345         rtrack2_unit.muted = 1;
 346
 347         return 0;
 348 }
 349
 350 MODULE_AUTHOR("Ben Pfaff");
 351 MODULE_DESCRIPTION("A driver for the RadioTrack II radio card.");
 352 MODULE_LICENSE("GPL");
 353
 354 module_param(io, int, 0);
 355 MODULE_PARM_DESC(io, "I/O address of the RadioTrack card (0x20c or 0x30c)");
 356 module_param(radio_nr, int, 0);
 357
 358 static void __exit rtrack2_cleanup_module(void)
 359 {
 360         video_unregister_device(&rtrack2_radio);
 361         release_region(io,4);
 362 }
 363
 364 module_init(rtrack2_init);
 365 module_exit(rtrack2_cleanup_module);
 366
 367 /*
 368   Local variables:
 369   compile-command: "mmake"
 370   End:
 371 */