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@lxorguk.ukuu.org.uk>
   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 rt_device *rt = video_drvdata(file);
 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 rt_device *rt = video_drvdata(file);
 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 rt_device *rt = video_drvdata(file);
 187
 188         f->type = V4L2_TUNER_RADIO;
 189         f->frequency = rt->curfreq;
 190         return 0;
 191 }
 192
 193 static int vidioc_queryctrl(struct file *file, void *priv,
 194                                 struct v4l2_queryctrl *qc)
 195 {
 196         int i;
 197
 198         for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
 199                 if (qc->id && qc->id == radio_qctrl[i].id) {
 200                         memcpy(qc, &(radio_qctrl[i]),
 201                                                 sizeof(*qc));
 202                         return 0;
 203                 }
 204         }
 205         return -EINVAL;
 206 }
 207
 208 static int vidioc_g_ctrl(struct file *file, void *priv,
 209                                 struct v4l2_control *ctrl)
 210 {
 211         struct rt_device *rt = video_drvdata(file);
 212
 213         switch (ctrl->id) {
 214         case V4L2_CID_AUDIO_MUTE:
 215                 ctrl->value = rt->muted;
 216                 return 0;
 217         case V4L2_CID_AUDIO_VOLUME:
 218                 if (rt->muted)
 219                         ctrl->value = 0;
 220                 else
 221                         ctrl->value = 65535;
 222                 return 0;
 223         }
 224         return -EINVAL;
 225 }
 226
 227 static int vidioc_s_ctrl(struct file *file, void *priv,
 228                                 struct v4l2_control *ctrl)
 229 {
 230         struct rt_device *rt = video_drvdata(file);
 231
 232         switch (ctrl->id) {
 233         case V4L2_CID_AUDIO_MUTE:
 234                 if (ctrl->value)
 235                         rt_mute(rt);
 236                 else
 237                         rt_unmute(rt);
 238                 return 0;
 239         case V4L2_CID_AUDIO_VOLUME:
 240                 if (ctrl->value)
 241                         rt_unmute(rt);
 242                 else
 243                         rt_mute(rt);
 244                 return 0;
 245         }
 246         return -EINVAL;
 247 }
 248
 249 static int vidioc_g_audio(struct file *file, void *priv,
 250                                 struct v4l2_audio *a)
 251 {
 252         if (a->index > 1)
 253                 return -EINVAL;
 254
 255         strcpy(a->name, "Radio");
 256         a->capability = V4L2_AUDCAP_STEREO;
 257         return 0;
 258 }
 259
 260 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 261 {
 262         *i = 0;
 263         return 0;
 264 }
 265
 266 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 267 {
 268         if (i != 0)
 269                 return -EINVAL;
 270         return 0;
 271 }
 272
 273 static int vidioc_s_audio(struct file *file, void *priv,
 274                                 struct v4l2_audio *a)
 275 {
 276         if (a->index != 0)
 277                 return -EINVAL;
 278         return 0;
 279 }
 280
 281 static struct rt_device rtrack2_unit;
 282
 283 static int rtrack2_exclusive_open(struct file *file)
 284 {
 285         return test_and_set_bit(0, &rtrack2_unit.in_use) ? -EBUSY : 0;
 286 }
 287
 288 static int rtrack2_exclusive_release(struct file *file)
 289 {
 290         clear_bit(0, &rtrack2_unit.in_use);
 291         return 0;
 292 }
 293
 294 static const struct v4l2_file_operations rtrack2_fops = {
 295         .owner          = THIS_MODULE,
 296         .open           = rtrack2_exclusive_open,
 297         .release        = rtrack2_exclusive_release,
 298         .ioctl          = video_ioctl2,
 299 };
 300
 301 static const struct v4l2_ioctl_ops rtrack2_ioctl_ops = {
 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 struct video_device rtrack2_radio = {
 317         .name           = "RadioTrack II radio",
 318         .fops           = &rtrack2_fops,
 319         .ioctl_ops      = &rtrack2_ioctl_ops,
 320         .release        = video_device_release_empty,
 321 };
 322
 323 static int __init rtrack2_init(void)
 324 {
 325         if(io==-1)
 326         {
 327                 printk(KERN_ERR "You must set an I/O address with io=0x20c or io=0x30c\n");
 328                 return -EINVAL;
 329         }
 330         if (!request_region(io, 4, "rtrack2"))
 331         {
 332                 printk(KERN_ERR "rtrack2: port 0x%x already in use\n", io);
 333                 return -EBUSY;
 334         }
 335
 336         video_set_drvdata(&rtrack2_radio, &rtrack2_unit);
 337
 338         spin_lock_init(&lock);
 339         if (video_register_device(&rtrack2_radio, VFL_TYPE_RADIO, radio_nr) < 0) {
 340                 release_region(io, 4);
 341                 return -EINVAL;
 342         }
 343
 344         printk(KERN_INFO "AIMSlab Radiotrack II card driver.\n");
 345
 346         /* mute card - prevents noisy bootups */
 347         outb(1, io);
 348         rtrack2_unit.muted = 1;
 349
 350         return 0;
 351 }
 352
 353 MODULE_AUTHOR("Ben Pfaff");
 354 MODULE_DESCRIPTION("A driver for the RadioTrack II radio card.");
 355 MODULE_LICENSE("GPL");
 356
 357 module_param(io, int, 0);
 358 MODULE_PARM_DESC(io, "I/O address of the RadioTrack card (0x20c or 0x30c)");
 359 module_param(radio_nr, int, 0);
 360
 361 static void __exit rtrack2_cleanup_module(void)
 362 {
 363         video_unregister_device(&rtrack2_radio);
 364         release_region(io,4);
 365 }
 366
 367 module_init(rtrack2_init);
 368 module_exit(rtrack2_cleanup_module);
 369
 370 /*
 371   Local variables:
 372   compile-command: "mmake"
 373   End:
 374 */