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