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 <linux/videodev2.h>    /* kernel radio structs         */
  17 #include <linux/mutex.h>
  18 #include <linux/io.h>           /* outb, outb_p                 */
  19 #include <media/v4l2-device.h>
  20 #include <media/v4l2-ioctl.h>
  21
  22 MODULE_AUTHOR("Ben Pfaff");
  23 MODULE_DESCRIPTION("A driver for the RadioTrack II radio card.");
  24 MODULE_LICENSE("GPL");
  25 MODULE_VERSION("0.0.3");
  26
  27 #ifndef CONFIG_RADIO_RTRACK2_PORT
  28 #define CONFIG_RADIO_RTRACK2_PORT -1
  29 #endif
  30
  31 static int io = CONFIG_RADIO_RTRACK2_PORT;
  32 static int radio_nr = -1;
  33
  34 module_param(io, int, 0);
  35 MODULE_PARM_DESC(io, "I/O address of the RadioTrack card (0x20c or 0x30c)");
  36 module_param(radio_nr, int, 0);
  37
  38 struct rtrack2
  39 {
  40         struct v4l2_device v4l2_dev;
  41         struct video_device vdev;
  42         int io;
  43         unsigned long curfreq;
  44         int muted;
  45         struct mutex lock;
  46 };
  47
  48 static struct rtrack2 rtrack2_card;
  49
  50
  51 /* local things */
  52
  53 static void rt_mute(struct rtrack2 *dev)
  54 {
  55         if (dev->muted)
  56                 return;
  57         mutex_lock(&dev->lock);
  58         outb(1, dev->io);
  59         mutex_unlock(&dev->lock);
  60         dev->muted = 1;
  61 }
  62
  63 static void rt_unmute(struct rtrack2 *dev)
  64 {
  65         if(dev->muted == 0)
  66                 return;
  67         mutex_lock(&dev->lock);
  68         outb(0, dev->io);
  69         mutex_unlock(&dev->lock);
  70         dev->muted = 0;
  71 }
  72
  73 static void zero(struct rtrack2 *dev)
  74 {
  75         outb_p(1, dev->io);
  76         outb_p(3, dev->io);
  77         outb_p(1, dev->io);
  78 }
  79
  80 static void one(struct rtrack2 *dev)
  81 {
  82         outb_p(5, dev->io);
  83         outb_p(7, dev->io);
  84         outb_p(5, dev->io);
  85 }
  86
  87 static int rt_setfreq(struct rtrack2 *dev, unsigned long freq)
  88 {
  89         int i;
  90
  91         mutex_lock(&dev->lock);
  92         dev->curfreq = freq;
  93         freq = freq / 200 + 856;
  94
  95         outb_p(0xc8, dev->io);
  96         outb_p(0xc9, dev->io);
  97         outb_p(0xc9, dev->io);
  98
  99         for (i = 0; i < 10; i++)
 100                 zero(dev);
 101
 102         for (i = 14; i >= 0; i--)
 103                 if (freq & (1 << i))
 104                         one(dev);
 105                 else
 106                         zero(dev);
 107
 108         outb_p(0xc8, dev->io);
 109         if (!dev->muted)
 110                 outb_p(0, dev->io);
 111
 112         mutex_unlock(&dev->lock);
 113         return 0;
 114 }
 115
 116 static int vidioc_querycap(struct file *file, void *priv,
 117                                 struct v4l2_capability *v)
 118 {
 119         strlcpy(v->driver, "radio-rtrack2", sizeof(v->driver));
 120         strlcpy(v->card, "RadioTrack II", sizeof(v->card));
 121         strlcpy(v->bus_info, "ISA", sizeof(v->bus_info));
 122         v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
 123         return 0;
 124 }
 125
 126 static int vidioc_s_tuner(struct file *file, void *priv,
 127                                 struct v4l2_tuner *v)
 128 {
 129         return v->index ? -EINVAL : 0;
 130 }
 131
 132 static int rt_getsigstr(struct rtrack2 *dev)
 133 {
 134         int sig = 1;
 135
 136         mutex_lock(&dev->lock);
 137         if (inb(dev->io) & 2)   /* bit set = no signal present  */
 138                 sig = 0;
 139         mutex_unlock(&dev->lock);
 140         return sig;
 141 }
 142
 143 static int vidioc_g_tuner(struct file *file, void *priv,
 144                                 struct v4l2_tuner *v)
 145 {
 146         struct rtrack2 *rt = video_drvdata(file);
 147
 148         if (v->index > 0)
 149                 return -EINVAL;
 150
 151         strlcpy(v->name, "FM", sizeof(v->name));
 152         v->type = V4L2_TUNER_RADIO;
 153         v->rangelow = 88 * 16000;
 154         v->rangehigh = 108 * 16000;
 155         v->rxsubchans = V4L2_TUNER_SUB_MONO;
 156         v->capability = V4L2_TUNER_CAP_LOW;
 157         v->audmode = V4L2_TUNER_MODE_MONO;
 158         v->signal = 0xFFFF * rt_getsigstr(rt);
 159         return 0;
 160 }
 161
 162 static int vidioc_s_frequency(struct file *file, void *priv,
 163                                 struct v4l2_frequency *f)
 164 {
 165         struct rtrack2 *rt = video_drvdata(file);
 166
 167         if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
 168                 return -EINVAL;
 169         rt_setfreq(rt, f->frequency);
 170         return 0;
 171 }
 172
 173 static int vidioc_g_frequency(struct file *file, void *priv,
 174                                 struct v4l2_frequency *f)
 175 {
 176         struct rtrack2 *rt = video_drvdata(file);
 177
 178         if (f->tuner != 0)
 179                 return -EINVAL;
 180         f->type = V4L2_TUNER_RADIO;
 181         f->frequency = rt->curfreq;
 182         return 0;
 183 }
 184
 185 static int vidioc_queryctrl(struct file *file, void *priv,
 186                                 struct v4l2_queryctrl *qc)
 187 {
 188         switch (qc->id) {
 189         case V4L2_CID_AUDIO_MUTE:
 190                 return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
 191         case V4L2_CID_AUDIO_VOLUME:
 192                 return v4l2_ctrl_query_fill(qc, 0, 65535, 65535, 65535);
 193         }
 194         return -EINVAL;
 195 }
 196
 197 static int vidioc_g_ctrl(struct file *file, void *priv,
 198                                 struct v4l2_control *ctrl)
 199 {
 200         struct rtrack2 *rt = video_drvdata(file);
 201
 202         switch (ctrl->id) {
 203         case V4L2_CID_AUDIO_MUTE:
 204                 ctrl->value = rt->muted;
 205                 return 0;
 206         case V4L2_CID_AUDIO_VOLUME:
 207                 if (rt->muted)
 208                         ctrl->value = 0;
 209                 else
 210                         ctrl->value = 65535;
 211                 return 0;
 212         }
 213         return -EINVAL;
 214 }
 215
 216 static int vidioc_s_ctrl(struct file *file, void *priv,
 217                                 struct v4l2_control *ctrl)
 218 {
 219         struct rtrack2 *rt = video_drvdata(file);
 220
 221         switch (ctrl->id) {
 222         case V4L2_CID_AUDIO_MUTE:
 223                 if (ctrl->value)
 224                         rt_mute(rt);
 225                 else
 226                         rt_unmute(rt);
 227                 return 0;
 228         case V4L2_CID_AUDIO_VOLUME:
 229                 if (ctrl->value)
 230                         rt_unmute(rt);
 231                 else
 232                         rt_mute(rt);
 233                 return 0;
 234         }
 235         return -EINVAL;
 236 }
 237
 238 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 239 {
 240         *i = 0;
 241         return 0;
 242 }
 243
 244 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 245 {
 246         return i ? -EINVAL : 0;
 247 }
 248
 249 static int vidioc_g_audio(struct file *file, void *priv,
 250                                 struct v4l2_audio *a)
 251 {
 252         a->index = 0;
 253         strlcpy(a->name, "Radio", sizeof(a->name));
 254         a->capability = V4L2_AUDCAP_STEREO;
 255         return 0;
 256 }
 257
 258 static int vidioc_s_audio(struct file *file, void *priv,
 259                                 struct v4l2_audio *a)
 260 {
 261         return a->index ? -EINVAL : 0;
 262 }
 263
 264 static const struct v4l2_file_operations rtrack2_fops = {
 265         .owner          = THIS_MODULE,
 266         .unlocked_ioctl = video_ioctl2,
 267 };
 268
 269 static const struct v4l2_ioctl_ops rtrack2_ioctl_ops = {
 270         .vidioc_querycap    = vidioc_querycap,
 271         .vidioc_g_tuner     = vidioc_g_tuner,
 272         .vidioc_s_tuner     = vidioc_s_tuner,
 273         .vidioc_g_frequency = vidioc_g_frequency,
 274         .vidioc_s_frequency = vidioc_s_frequency,
 275         .vidioc_queryctrl   = vidioc_queryctrl,
 276         .vidioc_g_ctrl      = vidioc_g_ctrl,
 277         .vidioc_s_ctrl      = vidioc_s_ctrl,
 278         .vidioc_g_audio     = vidioc_g_audio,
 279         .vidioc_s_audio     = vidioc_s_audio,
 280         .vidioc_g_input     = vidioc_g_input,
 281         .vidioc_s_input     = vidioc_s_input,
 282 };
 283
 284 static int __init rtrack2_init(void)
 285 {
 286         struct rtrack2 *dev = &rtrack2_card;
 287         struct v4l2_device *v4l2_dev = &dev->v4l2_dev;
 288         int res;
 289
 290         strlcpy(v4l2_dev->name, "rtrack2", sizeof(v4l2_dev->name));
 291         dev->io = io;
 292         if (dev->io == -1) {
 293                 v4l2_err(v4l2_dev, "You must set an I/O address with io=0x20c or io=0x30c\n");
 294                 return -EINVAL;
 295         }
 296         if (!request_region(dev->io, 4, "rtrack2")) {
 297                 v4l2_err(v4l2_dev, "port 0x%x already in use\n", dev->io);
 298                 return -EBUSY;
 299         }
 300
 301         res = v4l2_device_register(NULL, v4l2_dev);
 302         if (res < 0) {
 303                 release_region(dev->io, 4);
 304                 v4l2_err(v4l2_dev, "Could not register v4l2_device\n");
 305                 return res;
 306         }
 307
 308         strlcpy(dev->vdev.name, v4l2_dev->name, sizeof(dev->vdev.name));
 309         dev->vdev.v4l2_dev = v4l2_dev;
 310         dev->vdev.fops = &rtrack2_fops;
 311         dev->vdev.ioctl_ops = &rtrack2_ioctl_ops;
 312         dev->vdev.release = video_device_release_empty;
 313         video_set_drvdata(&dev->vdev, dev);
 314
 315         /* mute card - prevents noisy bootups */
 316         outb(1, dev->io);
 317         dev->muted = 1;
 318
 319         mutex_init(&dev->lock);
 320         if (video_register_device(&dev->vdev, VFL_TYPE_RADIO, radio_nr) < 0) {
 321                 v4l2_device_unregister(v4l2_dev);
 322                 release_region(dev->io, 4);
 323                 return -EINVAL;
 324         }
 325
 326         v4l2_info(v4l2_dev, "AIMSlab Radiotrack II card driver.\n");
 327
 328         return 0;
 329 }
 330
 331 static void __exit rtrack2_exit(void)
 332 {
 333         struct rtrack2 *dev = &rtrack2_card;
 334
 335         video_unregister_device(&dev->vdev);
 336         v4l2_device_unregister(&dev->v4l2_dev);
 337         release_region(dev->io, 4);
 338 }
 339
 340 module_init(rtrack2_init);
 341 module_exit(rtrack2_exit);