drivers/media/radio/radio-sf16fmi.c

   1 /* SF16FMI 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.cox@linux.org>
   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 SF16FMI
  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/videodev2.h>    /* kernel radio structs         */
  26 #include <media/v4l2-common.h>
  27 #include <media/v4l2-ioctl.h>
  28 #include <linux/isapnp.h>
  29 #include <asm/io.h>             /* outb, outb_p                 */
  30 #include <asm/uaccess.h>        /* copy to/from user            */
  31 #include <linux/mutex.h>
  32
  33 #define RADIO_VERSION KERNEL_VERSION(0,0,2)
  34
  35 static struct v4l2_queryctrl radio_qctrl[] = {
  36         {
  37                 .id            = V4L2_CID_AUDIO_MUTE,
  38                 .name          = "Mute",
  39                 .minimum       = 0,
  40                 .maximum       = 1,
  41                 .default_value = 1,
  42                 .type          = V4L2_CTRL_TYPE_BOOLEAN,
  43         }
  44 };
  45
  46 struct fmi_device
  47 {
  48         int port;
  49         int curvol; /* 1 or 0 */
  50         unsigned long curfreq; /* freq in kHz */
  51         __u32 flags;
  52 };
  53
  54 static int io = -1;
  55 static int radio_nr = -1;
  56 static struct pnp_dev *dev = NULL;
  57 static struct mutex lock;
  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 intervall 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 port)
  69 {
  70         while(bits--) {
  71                 if(data & 1) {
  72                         outb(5, port);
  73                         udelay(6);
  74                         outb(7, port);
  75                         udelay(6);
  76                 } else {
  77                         outb(1, port);
  78                         udelay(6);
  79                         outb(3, port);
  80                         udelay(6);
  81                 }
  82                 data>>=1;
  83         }
  84 }
  85
  86 static inline void fmi_mute(int port)
  87 {
  88         mutex_lock(&lock);
  89         outb(0x00, port);
  90         mutex_unlock(&lock);
  91 }
  92
  93 static inline void fmi_unmute(int port)
  94 {
  95         mutex_lock(&lock);
  96         outb(0x08, port);
  97         mutex_unlock(&lock);
  98 }
  99
 100 static inline int fmi_setfreq(struct fmi_device *dev)
 101 {
 102         int myport = dev->port;
 103         unsigned long freq = dev->curfreq;
 104
 105         mutex_lock(&lock);
 106
 107         outbits(16, RSF16_ENCODE(freq), myport);
 108         outbits(8, 0xC0, myport);
 109         msleep(143);            /* was schedule_timeout(HZ/7) */
 110         mutex_unlock(&lock);
 111         if (dev->curvol) fmi_unmute(myport);
 112         return 0;
 113 }
 114
 115 static inline int fmi_getsigstr(struct fmi_device *dev)
 116 {
 117         int val;
 118         int res;
 119         int myport = dev->port;
 120
 121
 122         mutex_lock(&lock);
 123         val = dev->curvol ? 0x08 : 0x00;        /* unmute/mute */
 124         outb(val, myport);
 125         outb(val | 0x10, myport);
 126         msleep(143);            /* was schedule_timeout(HZ/7) */
 127         res = (int)inb(myport+1);
 128         outb(val, myport);
 129
 130         mutex_unlock(&lock);
 131         return (res & 2) ? 0 : 0xFFFF;
 132 }
 133
 134 static int vidioc_querycap(struct file *file, void  *priv,
 135                                         struct v4l2_capability *v)
 136 {
 137         strlcpy(v->driver, "radio-sf16fmi", sizeof(v->driver));
 138         strlcpy(v->card, "SF16-FMx radio", sizeof(v->card));
 139         sprintf(v->bus_info, "ISA");
 140         v->version = RADIO_VERSION;
 141         v->capabilities = V4L2_CAP_TUNER;
 142         return 0;
 143 }
 144
 145 static int vidioc_g_tuner(struct file *file, void *priv,
 146                                         struct v4l2_tuner *v)
 147 {
 148         int mult;
 149         struct video_device *dev = video_devdata(file);
 150         struct fmi_device *fmi = dev->priv;
 151
 152         if (v->index > 0)
 153                 return -EINVAL;
 154
 155         strcpy(v->name, "FM");
 156         v->type = V4L2_TUNER_RADIO;
 157         mult = (fmi->flags & V4L2_TUNER_CAP_LOW) ? 1 : 1000;
 158         v->rangelow = RSF16_MINFREQ/mult;
 159         v->rangehigh = RSF16_MAXFREQ/mult;
 160         v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_MODE_STEREO;
 161         v->capability = fmi->flags&V4L2_TUNER_CAP_LOW;
 162         v->audmode = V4L2_TUNER_MODE_STEREO;
 163         v->signal = fmi_getsigstr(fmi);
 164         return 0;
 165 }
 166
 167 static int vidioc_s_tuner(struct file *file, void *priv,
 168                                         struct v4l2_tuner *v)
 169 {
 170         if (v->index > 0)
 171                 return -EINVAL;
 172         return 0;
 173 }
 174
 175 static int vidioc_s_frequency(struct file *file, void *priv,
 176                                         struct v4l2_frequency *f)
 177 {
 178         struct video_device *dev = video_devdata(file);
 179         struct fmi_device *fmi = dev->priv;
 180
 181         if (!(fmi->flags & V4L2_TUNER_CAP_LOW))
 182                 f->frequency *= 1000;
 183         if (f->frequency < RSF16_MINFREQ ||
 184                         f->frequency > RSF16_MAXFREQ )
 185                 return -EINVAL;
 186         /*rounding in steps of 800 to match th freq
 187         that will be used */
 188         fmi->curfreq = (f->frequency/800)*800;
 189         fmi_setfreq(fmi);
 190         return 0;
 191 }
 192
 193 static int vidioc_g_frequency(struct file *file, void *priv,
 194                                         struct v4l2_frequency *f)
 195 {
 196         struct video_device *dev = video_devdata(file);
 197         struct fmi_device *fmi = dev->priv;
 198
 199         f->type = V4L2_TUNER_RADIO;
 200         f->frequency = fmi->curfreq;
 201         if (!(fmi->flags & V4L2_TUNER_CAP_LOW))
 202                 f->frequency /= 1000;
 203         return 0;
 204 }
 205
 206 static int vidioc_queryctrl(struct file *file, void *priv,
 207                                         struct v4l2_queryctrl *qc)
 208 {
 209         int i;
 210
 211         for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
 212                 if (qc->id && qc->id == radio_qctrl[i].id) {
 213                         memcpy(qc, &(radio_qctrl[i]),
 214                                                 sizeof(*qc));
 215                         return 0;
 216                 }
 217         }
 218         return -EINVAL;
 219 }
 220
 221 static int vidioc_g_ctrl(struct file *file, void *priv,
 222                                         struct v4l2_control *ctrl)
 223 {
 224         struct video_device *dev = video_devdata(file);
 225         struct fmi_device *fmi = dev->priv;
 226
 227         switch (ctrl->id) {
 228         case V4L2_CID_AUDIO_MUTE:
 229                 ctrl->value = fmi->curvol;
 230                 return 0;
 231         }
 232         return -EINVAL;
 233 }
 234
 235 static int vidioc_s_ctrl(struct file *file, void *priv,
 236                                         struct v4l2_control *ctrl)
 237 {
 238         struct video_device *dev = video_devdata(file);
 239         struct fmi_device *fmi = dev->priv;
 240
 241         switch (ctrl->id) {
 242         case V4L2_CID_AUDIO_MUTE:
 243                 if (ctrl->value)
 244                         fmi_mute(fmi->port);
 245                 else
 246                         fmi_unmute(fmi->port);
 247                 fmi->curvol = ctrl->value;
 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 fmi_device fmi_unit;
 286
 287 static const struct file_operations fmi_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 fmi_ioctl_ops = {
 299         .vidioc_querycap    = vidioc_querycap,
 300         .vidioc_g_tuner     = vidioc_g_tuner,
 301         .vidioc_s_tuner     = vidioc_s_tuner,
 302         .vidioc_g_audio     = vidioc_g_audio,
 303         .vidioc_s_audio     = vidioc_s_audio,
 304         .vidioc_g_input     = vidioc_g_input,
 305         .vidioc_s_input     = vidioc_s_input,
 306         .vidioc_g_frequency = vidioc_g_frequency,
 307         .vidioc_s_frequency = vidioc_s_frequency,
 308         .vidioc_queryctrl   = vidioc_queryctrl,
 309         .vidioc_g_ctrl      = vidioc_g_ctrl,
 310         .vidioc_s_ctrl      = vidioc_s_ctrl,
 311 };
 312
 313 static struct video_device fmi_radio = {
 314         .name           = "SF16FMx radio",
 315         .fops           = &fmi_fops,
 316         .ioctl_ops      = &fmi_ioctl_ops,
 317 };
 318
 319 /* ladis: this is my card. does any other types exist? */
 320 static struct isapnp_device_id id_table[] __devinitdata = {
 321         {       ISAPNP_ANY_ID, ISAPNP_ANY_ID,
 322                 ISAPNP_VENDOR('M','F','R'), ISAPNP_FUNCTION(0xad10), 0},
 323         {       ISAPNP_CARD_END, },
 324 };
 325
 326 MODULE_DEVICE_TABLE(isapnp, id_table);
 327
 328 static int __init isapnp_fmi_probe(void)
 329 {
 330         int i = 0;
 331
 332         while (id_table[i].card_vendor != 0 && dev == NULL) {
 333                 dev = pnp_find_dev(NULL, id_table[i].vendor,
 334                                    id_table[i].function, NULL);
 335                 i++;
 336         }
 337
 338         if (!dev)
 339                 return -ENODEV;
 340         if (pnp_device_attach(dev) < 0)
 341                 return -EAGAIN;
 342         if (pnp_activate_dev(dev) < 0) {
 343                 printk ("radio-sf16fmi: PnP configure failed (out of resources?)\n");
 344                 pnp_device_detach(dev);
 345                 return -ENOMEM;
 346         }
 347         if (!pnp_port_valid(dev, 0)) {
 348                 pnp_device_detach(dev);
 349                 return -ENODEV;
 350         }
 351
 352         i = pnp_port_start(dev, 0);
 353         printk ("radio-sf16fmi: PnP reports card at %#x\n", i);
 354
 355         return i;
 356 }
 357
 358 static int __init fmi_init(void)
 359 {
 360         if (io < 0)
 361                 io = isapnp_fmi_probe();
 362         if (io < 0) {
 363                 printk(KERN_ERR "radio-sf16fmi: No PnP card found.\n");
 364                 return io;
 365         }
 366         if (!request_region(io, 2, "radio-sf16fmi")) {
 367                 printk(KERN_ERR "radio-sf16fmi: port 0x%x already in use\n", io);
 368                 pnp_device_detach(dev);
 369                 return -EBUSY;
 370         }
 371
 372         fmi_unit.port = io;
 373         fmi_unit.curvol = 0;
 374         fmi_unit.curfreq = 0;
 375         fmi_unit.flags = V4L2_TUNER_CAP_LOW;
 376         fmi_radio.priv = &fmi_unit;
 377
 378         mutex_init(&lock);
 379
 380         if (video_register_device(&fmi_radio, VFL_TYPE_RADIO, radio_nr) < 0) {
 381                 release_region(io, 2);
 382                 return -EINVAL;
 383         }
 384
 385         printk(KERN_INFO "SF16FMx radio card driver at 0x%x\n", io);
 386         /* mute card - prevents noisy bootups */
 387         fmi_mute(io);
 388         return 0;
 389 }
 390
 391 MODULE_AUTHOR("Petr Vandrovec, vandrove@vc.cvut.cz and M. Kirkwood");
 392 MODULE_DESCRIPTION("A driver for the SF16MI radio.");
 393 MODULE_LICENSE("GPL");
 394
 395 module_param(io, int, 0);
 396 MODULE_PARM_DESC(io, "I/O address of the SF16MI card (0x284 or 0x384)");
 397 module_param(radio_nr, int, 0);
 398
 399 static void __exit fmi_cleanup_module(void)
 400 {
 401         video_unregister_device(&fmi_radio);
 402         release_region(io, 2);
 403         if (dev)
 404                 pnp_device_detach(dev);
 405 }
 406
 407 module_init(fmi_init);
 408 module_exit(fmi_cleanup_module);