drivers/media/radio/radio-sf16fmi.c

   1 /* SF16-FMI and SF16-FMP radio driver for Linux radio support
   2  * heavily based on rtrack driver...
   3  * (c) 1997 M. Kirkwood
   4  * (c) 1998 Petr Vandrovec, vandrove@vc.cvut.cz
   5  *
   6  * Fitted to new interface by Alan Cox <alan@lxorguk.ukuu.org.uk>
   7  * Made working and cleaned up functions <mikael.hedin@irf.se>
   8  * Support for ISAPnP by Ladislav Michl <ladis@psi.cz>
   9  *
  10  * Notes on the hardware
  11  *
  12  *  Frequency control is done digitally -- ie out(port,encodefreq(95.8));
  13  *  No volume control - only mute/unmute - you have to use line volume
  14  *  control on SB-part of SF16-FMI/SF16-FMP
  15  *
  16  * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
  17  */
  18
  19 #include <linux/version.h>
  20 #include <linux/kernel.h>       /* __setup                      */
  21 #include <linux/module.h>       /* Modules                      */
  22 #include <linux/init.h>         /* Initdata                     */
  23 #include <linux/ioport.h>       /* request_region               */
  24 #include <linux/delay.h>        /* udelay                       */
  25 #include <linux/isapnp.h>
  26 #include <linux/mutex.h>
  27 #include <linux/videodev2.h>    /* kernel radio structs         */
  28 #include <linux/io.h>           /* outb, outb_p                 */
  29 #include <media/v4l2-device.h>
  30 #include <media/v4l2-ioctl.h>
  31
  32 MODULE_AUTHOR("Petr Vandrovec, vandrove@vc.cvut.cz and M. Kirkwood");
  33 MODULE_DESCRIPTION("A driver for the SF16-FMI and SF16-FMP radio.");
  34 MODULE_LICENSE("GPL");
  35
  36 static int io = -1;
  37 static int radio_nr = -1;
  38
  39 module_param(io, int, 0);
  40 MODULE_PARM_DESC(io, "I/O address of the SF16-FMI or SF16-FMP card (0x284 or 0x384)");
  41 module_param(radio_nr, int, 0);
  42
  43 #define RADIO_VERSION KERNEL_VERSION(0, 0, 2)
  44
  45 struct fmi
  46 {
  47         struct v4l2_device v4l2_dev;
  48         struct video_device vdev;
  49         int io;
  50         bool mute;
  51         unsigned long curfreq; /* freq in kHz */
  52         struct mutex lock;
  53 };
  54
  55 static struct fmi fmi_card;
  56 static struct pnp_dev *dev;
  57 bool pnp_attached;
  58
  59 /* freq is in 1/16 kHz to internal number, hw precision is 50 kHz */
  60 /* It is only useful to give freq in interval of 800 (=0.05Mhz),
  61  * other bits will be truncated, e.g 92.7400016 -> 92.7, but
  62  * 92.7400017 -> 92.75
  63  */
  64 #define RSF16_ENCODE(x) ((x) / 800 + 214)
  65 #define RSF16_MINFREQ (87 * 16000)
  66 #define RSF16_MAXFREQ (108 * 16000)
  67
  68 static void outbits(int bits, unsigned int data, int io)
  69 {
  70         while (bits--) {
  71                 if (data & 1) {
  72                         outb(5, io);
  73                         udelay(6);
  74                         outb(7, io);
  75                         udelay(6);
  76                 } else {
  77                         outb(1, io);
  78                         udelay(6);
  79                         outb(3, io);
  80                         udelay(6);
  81                 }
  82                 data >>= 1;
  83         }
  84 }
  85
  86 static inline void fmi_mute(struct fmi *fmi)
  87 {
  88         mutex_lock(&fmi->lock);
  89         outb(0x00, fmi->io);
  90         mutex_unlock(&fmi->lock);
  91 }
  92
  93 static inline void fmi_unmute(struct fmi *fmi)
  94 {
  95         mutex_lock(&fmi->lock);
  96         outb(0x08, fmi->io);
  97         mutex_unlock(&fmi->lock);
  98 }
  99
 100 static inline int fmi_setfreq(struct fmi *fmi, unsigned long freq)
 101 {
 102         mutex_lock(&fmi->lock);
 103         fmi->curfreq = freq;
 104
 105         outbits(16, RSF16_ENCODE(freq), fmi->io);
 106         outbits(8, 0xC0, fmi->io);
 107         msleep(143);            /* was schedule_timeout(HZ/7) */
 108         mutex_unlock(&fmi->lock);
 109         if (!fmi->mute)
 110                 fmi_unmute(fmi);
 111         return 0;
 112 }
 113
 114 static inline int fmi_getsigstr(struct fmi *fmi)
 115 {
 116         int val;
 117         int res;
 118
 119         mutex_lock(&fmi->lock);
 120         val = fmi->mute ? 0x00 : 0x08;  /* mute/unmute */
 121         outb(val, fmi->io);
 122         outb(val | 0x10, fmi->io);
 123         msleep(143);            /* was schedule_timeout(HZ/7) */
 124         res = (int)inb(fmi->io + 1);
 125         outb(val, fmi->io);
 126
 127         mutex_unlock(&fmi->lock);
 128         return (res & 2) ? 0 : 0xFFFF;
 129 }
 130
 131 static int vidioc_querycap(struct file *file, void  *priv,
 132                                         struct v4l2_capability *v)
 133 {
 134         strlcpy(v->driver, "radio-sf16fmi", sizeof(v->driver));
 135         strlcpy(v->card, "SF16-FMx radio", sizeof(v->card));
 136         strlcpy(v->bus_info, "ISA", sizeof(v->bus_info));
 137         v->version = RADIO_VERSION;
 138         v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
 139         return 0;
 140 }
 141
 142 static int vidioc_g_tuner(struct file *file, void *priv,
 143                                         struct v4l2_tuner *v)
 144 {
 145         struct fmi *fmi = video_drvdata(file);
 146
 147         if (v->index > 0)
 148                 return -EINVAL;
 149
 150         strlcpy(v->name, "FM", sizeof(v->name));
 151         v->type = V4L2_TUNER_RADIO;
 152         v->rangelow = RSF16_MINFREQ;
 153         v->rangehigh = RSF16_MAXFREQ;
 154         v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
 155         v->capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_LOW;
 156         v->audmode = V4L2_TUNER_MODE_STEREO;
 157         v->signal = fmi_getsigstr(fmi);
 158         return 0;
 159 }
 160
 161 static int vidioc_s_tuner(struct file *file, void *priv,
 162                                         struct v4l2_tuner *v)
 163 {
 164         return v->index ? -EINVAL : 0;
 165 }
 166
 167 static int vidioc_s_frequency(struct file *file, void *priv,
 168                                         struct v4l2_frequency *f)
 169 {
 170         struct fmi *fmi = video_drvdata(file);
 171
 172         if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
 173                 return -EINVAL;
 174         if (f->frequency < RSF16_MINFREQ ||
 175                         f->frequency > RSF16_MAXFREQ)
 176                 return -EINVAL;
 177         /* rounding in steps of 800 to match the freq
 178            that will be used */
 179         fmi_setfreq(fmi, (f->frequency / 800) * 800);
 180         return 0;
 181 }
 182
 183 static int vidioc_g_frequency(struct file *file, void *priv,
 184                                         struct v4l2_frequency *f)
 185 {
 186         struct fmi *fmi = video_drvdata(file);
 187
 188         if (f->tuner != 0)
 189                 return -EINVAL;
 190         f->type = V4L2_TUNER_RADIO;
 191         f->frequency = fmi->curfreq;
 192         return 0;
 193 }
 194
 195 static int vidioc_queryctrl(struct file *file, void *priv,
 196                                         struct v4l2_queryctrl *qc)
 197 {
 198         switch (qc->id) {
 199         case V4L2_CID_AUDIO_MUTE:
 200                 return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
 201         }
 202         return -EINVAL;
 203 }
 204
 205 static int vidioc_g_ctrl(struct file *file, void *priv,
 206                                         struct v4l2_control *ctrl)
 207 {
 208         struct fmi *fmi = video_drvdata(file);
 209
 210         switch (ctrl->id) {
 211         case V4L2_CID_AUDIO_MUTE:
 212                 ctrl->value = fmi->mute;
 213                 return 0;
 214         }
 215         return -EINVAL;
 216 }
 217
 218 static int vidioc_s_ctrl(struct file *file, void *priv,
 219                                         struct v4l2_control *ctrl)
 220 {
 221         struct fmi *fmi = video_drvdata(file);
 222
 223         switch (ctrl->id) {
 224         case V4L2_CID_AUDIO_MUTE:
 225                 if (ctrl->value)
 226                         fmi_mute(fmi);
 227                 else
 228                         fmi_unmute(fmi);
 229                 fmi->mute = ctrl->value;
 230                 return 0;
 231         }
 232         return -EINVAL;
 233 }
 234
 235 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 236 {
 237         *i = 0;
 238         return 0;
 239 }
 240
 241 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 242 {
 243         return i ? -EINVAL : 0;
 244 }
 245
 246 static int vidioc_g_audio(struct file *file, void *priv,
 247                                         struct v4l2_audio *a)
 248 {
 249         a->index = 0;
 250         strlcpy(a->name, "Radio", sizeof(a->name));
 251         a->capability = V4L2_AUDCAP_STEREO;
 252         return 0;
 253 }
 254
 255 static int vidioc_s_audio(struct file *file, void *priv,
 256                                         struct v4l2_audio *a)
 257 {
 258         return a->index ? -EINVAL : 0;
 259 }
 260
 261 static const struct v4l2_file_operations fmi_fops = {
 262         .owner          = THIS_MODULE,
 263         .unlocked_ioctl = video_ioctl2,
 264 };
 265
 266 static const struct v4l2_ioctl_ops fmi_ioctl_ops = {
 267         .vidioc_querycap    = vidioc_querycap,
 268         .vidioc_g_tuner     = vidioc_g_tuner,
 269         .vidioc_s_tuner     = vidioc_s_tuner,
 270         .vidioc_g_audio     = vidioc_g_audio,
 271         .vidioc_s_audio     = vidioc_s_audio,
 272         .vidioc_g_input     = vidioc_g_input,
 273         .vidioc_s_input     = vidioc_s_input,
 274         .vidioc_g_frequency = vidioc_g_frequency,
 275         .vidioc_s_frequency = vidioc_s_frequency,
 276         .vidioc_queryctrl   = vidioc_queryctrl,
 277         .vidioc_g_ctrl      = vidioc_g_ctrl,
 278         .vidioc_s_ctrl      = vidioc_s_ctrl,
 279 };
 280
 281 /* ladis: this is my card. does any other types exist? */
 282 static struct isapnp_device_id id_table[] __devinitdata = {
 283         {       ISAPNP_ANY_ID, ISAPNP_ANY_ID,
 284                 ISAPNP_VENDOR('M','F','R'), ISAPNP_FUNCTION(0xad10), 0},
 285         {       ISAPNP_CARD_END, },
 286 };
 287
 288 MODULE_DEVICE_TABLE(isapnp, id_table);
 289
 290 static int __init isapnp_fmi_probe(void)
 291 {
 292         int i = 0;
 293
 294         while (id_table[i].card_vendor != 0 && dev == NULL) {
 295                 dev = pnp_find_dev(NULL, id_table[i].vendor,
 296                                    id_table[i].function, NULL);
 297                 i++;
 298         }
 299
 300         if (!dev)
 301                 return -ENODEV;
 302         if (pnp_device_attach(dev) < 0)
 303                 return -EAGAIN;
 304         if (pnp_activate_dev(dev) < 0) {
 305                 printk(KERN_ERR "radio-sf16fmi: PnP configure failed (out of resources?)\n");
 306                 pnp_device_detach(dev);
 307                 return -ENOMEM;
 308         }
 309         if (!pnp_port_valid(dev, 0)) {
 310                 pnp_device_detach(dev);
 311                 return -ENODEV;
 312         }
 313
 314         i = pnp_port_start(dev, 0);
 315         printk(KERN_INFO "radio-sf16fmi: PnP reports card at %#x\n", i);
 316
 317         return i;
 318 }
 319
 320 static int __init fmi_init(void)
 321 {
 322         struct fmi *fmi = &fmi_card;
 323         struct v4l2_device *v4l2_dev = &fmi->v4l2_dev;
 324         int res, i;
 325         int probe_ports[] = { 0, 0x284, 0x384 };
 326
 327         if (io < 0) {
 328                 for (i = 0; i < ARRAY_SIZE(probe_ports); i++) {
 329                         io = probe_ports[i];
 330                         if (io == 0) {
 331                                 io = isapnp_fmi_probe();
 332                                 if (io < 0)
 333                                         continue;
 334                                 pnp_attached = 1;
 335                         }
 336                         if (!request_region(io, 2, "radio-sf16fmi")) {
 337                                 if (pnp_attached)
 338                                         pnp_device_detach(dev);
 339                                 io = -1;
 340                                 continue;
 341                         }
 342                         if (pnp_attached ||
 343                             ((inb(io) & 0xf9) == 0xf9 && (inb(io) & 0x4) == 0))
 344                                 break;
 345                         release_region(io, 2);
 346                         io = -1;
 347                 }
 348         } else {
 349                 if (!request_region(io, 2, "radio-sf16fmi")) {
 350                         printk(KERN_ERR "radio-sf16fmi: port %#x already in use\n", io);
 351                         return -EBUSY;
 352                 }
 353                 if (inb(io) == 0xff) {
 354                         printk(KERN_ERR "radio-sf16fmi: card not present at %#x\n", io);
 355                         release_region(io, 2);
 356                         return -ENODEV;
 357                 }
 358         }
 359         if (io < 0) {
 360                 printk(KERN_ERR "radio-sf16fmi: no cards found\n");
 361                 return -ENODEV;
 362         }
 363
 364         strlcpy(v4l2_dev->name, "sf16fmi", sizeof(v4l2_dev->name));
 365         fmi->io = io;
 366
 367         res = v4l2_device_register(NULL, v4l2_dev);
 368         if (res < 0) {
 369                 release_region(fmi->io, 2);
 370                 if (pnp_attached)
 371                         pnp_device_detach(dev);
 372                 v4l2_err(v4l2_dev, "Could not register v4l2_device\n");
 373                 return res;
 374         }
 375
 376         strlcpy(fmi->vdev.name, v4l2_dev->name, sizeof(fmi->vdev.name));
 377         fmi->vdev.v4l2_dev = v4l2_dev;
 378         fmi->vdev.fops = &fmi_fops;
 379         fmi->vdev.ioctl_ops = &fmi_ioctl_ops;
 380         fmi->vdev.release = video_device_release_empty;
 381         video_set_drvdata(&fmi->vdev, fmi);
 382
 383         mutex_init(&fmi->lock);
 384
 385         /* mute card - prevents noisy bootups */
 386         fmi_mute(fmi);
 387
 388         if (video_register_device(&fmi->vdev, VFL_TYPE_RADIO, radio_nr) < 0) {
 389                 v4l2_device_unregister(v4l2_dev);
 390                 release_region(fmi->io, 2);
 391                 if (pnp_attached)
 392                         pnp_device_detach(dev);
 393                 return -EINVAL;
 394         }
 395
 396         v4l2_info(v4l2_dev, "card driver at 0x%x\n", fmi->io);
 397         return 0;
 398 }
 399
 400 static void __exit fmi_exit(void)
 401 {
 402         struct fmi *fmi = &fmi_card;
 403
 404         video_unregister_device(&fmi->vdev);
 405         v4l2_device_unregister(&fmi->v4l2_dev);
 406         release_region(fmi->io, 2);
 407         if (dev && pnp_attached)
 408                 pnp_device_detach(dev);
 409 }
 410
 411 module_init(fmi_init);
 412 module_exit(fmi_exit);