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/kernel.h>       /* __setup                      */
  20 #include <linux/module.h>       /* Modules                      */
  21 #include <linux/init.h>         /* Initdata                     */
  22 #include <linux/ioport.h>       /* request_region               */
  23 #include <linux/delay.h>        /* udelay                       */
  24 #include <linux/videodev2.h>    /* kernel radio structs         */
  25 #include <media/v4l2-common.h>
  26 #include <linux/isapnp.h>
  27 #include <asm/io.h>             /* outb, outb_p                 */
  28 #include <asm/uaccess.h>        /* copy to/from user            */
  29 #include <linux/mutex.h>
  30
  31 #define RADIO_VERSION KERNEL_VERSION(0,0,2)
  32
  33 static struct v4l2_queryctrl radio_qctrl[] = {
  34         {
  35                 .id            = V4L2_CID_AUDIO_MUTE,
  36                 .name          = "Mute",
  37                 .minimum       = 0,
  38                 .maximum       = 1,
  39                 .default_value = 1,
  40                 .type          = V4L2_CTRL_TYPE_BOOLEAN,
  41         }
  42 };
  43
  44 struct fmi_device
  45 {
  46         int port;
  47         int curvol; /* 1 or 0 */
  48         unsigned long curfreq; /* freq in kHz */
  49         __u32 flags;
  50 };
  51
  52 static int io = -1;
  53 static int radio_nr = -1;
  54 static struct pnp_dev *dev = NULL;
  55 static struct mutex lock;
  56
  57 /* freq is in 1/16 kHz to internal number, hw precision is 50 kHz */
  58 /* It is only useful to give freq in intervall of 800 (=0.05Mhz),
  59  * other bits will be truncated, e.g 92.7400016 -> 92.7, but
  60  * 92.7400017 -> 92.75
  61  */
  62 #define RSF16_ENCODE(x) ((x)/800+214)
  63 #define RSF16_MINFREQ 87*16000
  64 #define RSF16_MAXFREQ 108*16000
  65
  66 static void outbits(int bits, unsigned int data, int port)
  67 {
  68         while(bits--) {
  69                 if(data & 1) {
  70                         outb(5, port);
  71                         udelay(6);
  72                         outb(7, port);
  73                         udelay(6);
  74                 } else {
  75                         outb(1, port);
  76                         udelay(6);
  77                         outb(3, port);
  78                         udelay(6);
  79                 }
  80                 data>>=1;
  81         }
  82 }
  83
  84 static inline void fmi_mute(int port)
  85 {
  86         mutex_lock(&lock);
  87         outb(0x00, port);
  88         mutex_unlock(&lock);
  89 }
  90
  91 static inline void fmi_unmute(int port)
  92 {
  93         mutex_lock(&lock);
  94         outb(0x08, port);
  95         mutex_unlock(&lock);
  96 }
  97
  98 static inline int fmi_setfreq(struct fmi_device *dev)
  99 {
 100         int myport = dev->port;
 101         unsigned long freq = dev->curfreq;
 102
 103         mutex_lock(&lock);
 104
 105         outbits(16, RSF16_ENCODE(freq), myport);
 106         outbits(8, 0xC0, myport);
 107         msleep(143);            /* was schedule_timeout(HZ/7) */
 108         mutex_unlock(&lock);
 109         if (dev->curvol) fmi_unmute(myport);
 110         return 0;
 111 }
 112
 113 static inline int fmi_getsigstr(struct fmi_device *dev)
 114 {
 115         int val;
 116         int res;
 117         int myport = dev->port;
 118
 119
 120         mutex_lock(&lock);
 121         val = dev->curvol ? 0x08 : 0x00;        /* unmute/mute */
 122         outb(val, myport);
 123         outb(val | 0x10, myport);
 124         msleep(143);            /* was schedule_timeout(HZ/7) */
 125         res = (int)inb(myport+1);
 126         outb(val, myport);
 127
 128         mutex_unlock(&lock);
 129         return (res & 2) ? 0 : 0xFFFF;
 130 }
 131
 132 static int fmi_do_ioctl(struct inode *inode, struct file *file,
 133                         unsigned int cmd, void *arg)
 134 {
 135         struct video_device *dev = video_devdata(file);
 136         struct fmi_device *fmi=dev->priv;
 137
 138         switch(cmd)
 139         {
 140                 case VIDIOC_QUERYCAP:
 141                 {
 142                         struct v4l2_capability *v = arg;
 143                         memset(v,0,sizeof(*v));
 144                         strlcpy(v->driver, "radio-sf16fmi", sizeof (v->driver));
 145                         strlcpy(v->card, "SF16-FMx radio", sizeof (v->card));
 146                         sprintf(v->bus_info,"ISA");
 147                         v->version = RADIO_VERSION;
 148                         v->capabilities = V4L2_CAP_TUNER;
 149
 150                         return 0;
 151                 }
 152                 case VIDIOC_G_TUNER:
 153                 {
 154                         struct v4l2_tuner *v = arg;
 155                         int mult;
 156
 157                         if (v->index > 0)
 158                                 return -EINVAL;
 159
 160                         memset(v,0,sizeof(*v));
 161                         strcpy(v->name, "FM");
 162                         v->type = V4L2_TUNER_RADIO;
 163
 164                         mult = (fmi->flags & V4L2_TUNER_CAP_LOW) ? 1 : 1000;
 165                         v->rangelow = RSF16_MINFREQ/mult;
 166                         v->rangehigh = RSF16_MAXFREQ/mult;
 167                         v->rxsubchans =V4L2_TUNER_SUB_MONO | V4L2_TUNER_MODE_STEREO;
 168                         v->capability=fmi->flags&V4L2_TUNER_CAP_LOW;
 169                         v->audmode = V4L2_TUNER_MODE_STEREO;
 170                         v->signal = fmi_getsigstr(fmi);
 171
 172                         return 0;
 173                 }
 174                 case VIDIOC_S_TUNER:
 175                 {
 176                         struct v4l2_tuner *v = arg;
 177
 178                         if (v->index > 0)
 179                                 return -EINVAL;
 180
 181                         return 0;
 182                 }
 183                 case VIDIOC_S_FREQUENCY:
 184                 {
 185                         struct v4l2_frequency *f = arg;
 186
 187                         if (!(fmi->flags & V4L2_TUNER_CAP_LOW))
 188                                 f->frequency *= 1000;
 189                         if (f->frequency < RSF16_MINFREQ ||
 190                                         f->frequency > RSF16_MAXFREQ )
 191                                 return -EINVAL;
 192                         /*rounding in steps of 800 to match th freq
 193                           that will be used */
 194                         fmi->curfreq = (f->frequency/800)*800;
 195                         fmi_setfreq(fmi);
 196
 197                         return 0;
 198                 }
 199                 case VIDIOC_G_FREQUENCY:
 200                 {
 201                         struct v4l2_frequency *f = arg;
 202
 203                         f->type = V4L2_TUNER_RADIO;
 204                         f->frequency = fmi->curfreq;
 205                         if (!(fmi->flags & V4L2_TUNER_CAP_LOW))
 206                                 f->frequency /= 1000;
 207
 208                         return 0;
 209                 }
 210                 case VIDIOC_QUERYCTRL:
 211                 {
 212                         struct v4l2_queryctrl *qc = arg;
 213                         int i;
 214
 215                         for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
 216                                 if (qc->id && qc->id == radio_qctrl[i].id) {
 217                                         memcpy(qc, &(radio_qctrl[i]),
 218                                                                 sizeof(*qc));
 219                                         return (0);
 220                                 }
 221                         }
 222                         return -EINVAL;
 223                 }
 224                 case VIDIOC_G_CTRL:
 225                 {
 226                         struct v4l2_control *ctrl= arg;
 227
 228                         switch (ctrl->id) {
 229                                 case V4L2_CID_AUDIO_MUTE:
 230                                         ctrl->value=fmi->curvol;
 231                                         return (0);
 232                         }
 233                         return -EINVAL;
 234                 }
 235                 case VIDIOC_S_CTRL:
 236                 {
 237                         struct v4l2_control *ctrl= arg;
 238
 239                         switch (ctrl->id) {
 240                                 case V4L2_CID_AUDIO_MUTE:
 241                                 {
 242                                         if (ctrl->value)
 243                                                 fmi_mute(fmi->port);
 244                                         else
 245                                                 fmi_unmute(fmi->port);
 246
 247                                         fmi->curvol=ctrl->value;
 248                                         return (0);
 249                                 }
 250                         }
 251                         return -EINVAL;
 252                 }
 253                 default:
 254                         return v4l_compat_translate_ioctl(inode,file,cmd,arg,
 255                                                           fmi_do_ioctl);
 256         }
 257 }
 258
 259 static int fmi_ioctl(struct inode *inode, struct file *file,
 260                      unsigned int cmd, unsigned long arg)
 261 {
 262         return video_usercopy(inode, file, cmd, arg, fmi_do_ioctl);
 263 }
 264
 265 static struct fmi_device fmi_unit;
 266
 267 static struct file_operations fmi_fops = {
 268         .owner          = THIS_MODULE,
 269         .open           = video_exclusive_open,
 270         .release        = video_exclusive_release,
 271         .ioctl          = fmi_ioctl,
 272         .compat_ioctl   = v4l_compat_ioctl32,
 273         .llseek         = no_llseek,
 274 };
 275
 276 static struct video_device fmi_radio=
 277 {
 278         .owner          = THIS_MODULE,
 279         .name           = "SF16FMx radio",
 280         .type           = VID_TYPE_TUNER,
 281         .hardware       = 0,
 282         .fops           = &fmi_fops,
 283 };
 284
 285 /* ladis: this is my card. does any other types exist? */
 286 static struct isapnp_device_id id_table[] __devinitdata = {
 287         {       ISAPNP_ANY_ID, ISAPNP_ANY_ID,
 288                 ISAPNP_VENDOR('M','F','R'), ISAPNP_FUNCTION(0xad10), 0},
 289         {       ISAPNP_CARD_END, },
 290 };
 291
 292 MODULE_DEVICE_TABLE(isapnp, id_table);
 293
 294 static int isapnp_fmi_probe(void)
 295 {
 296         int i = 0;
 297
 298         while (id_table[i].card_vendor != 0 && dev == NULL) {
 299                 dev = pnp_find_dev(NULL, id_table[i].vendor,
 300                                    id_table[i].function, NULL);
 301                 i++;
 302         }
 303
 304         if (!dev)
 305                 return -ENODEV;
 306         if (pnp_device_attach(dev) < 0)
 307                 return -EAGAIN;
 308         if (pnp_activate_dev(dev) < 0) {
 309                 printk ("radio-sf16fmi: PnP configure failed (out of resources?)\n");
 310                 pnp_device_detach(dev);
 311                 return -ENOMEM;
 312         }
 313         if (!pnp_port_valid(dev, 0)) {
 314                 pnp_device_detach(dev);
 315                 return -ENODEV;
 316         }
 317
 318         i = pnp_port_start(dev, 0);
 319         printk ("radio-sf16fmi: PnP reports card at %#x\n", i);
 320
 321         return i;
 322 }
 323
 324 static int __init fmi_init(void)
 325 {
 326         if (io < 0)
 327                 io = isapnp_fmi_probe();
 328         if (io < 0) {
 329                 printk(KERN_ERR "radio-sf16fmi: No PnP card found.\n");
 330                 return io;
 331         }
 332         if (!request_region(io, 2, "radio-sf16fmi")) {
 333                 printk(KERN_ERR "radio-sf16fmi: port 0x%x already in use\n", io);
 334                 return -EBUSY;
 335         }
 336
 337         fmi_unit.port = io;
 338         fmi_unit.curvol = 0;
 339         fmi_unit.curfreq = 0;
 340         fmi_unit.flags = V4L2_TUNER_CAP_LOW;
 341         fmi_radio.priv = &fmi_unit;
 342
 343         mutex_init(&lock);
 344
 345         if (video_register_device(&fmi_radio, VFL_TYPE_RADIO, radio_nr) == -1) {
 346                 release_region(io, 2);
 347                 return -EINVAL;
 348         }
 349
 350         printk(KERN_INFO "SF16FMx radio card driver at 0x%x\n", io);
 351         /* mute card - prevents noisy bootups */
 352         fmi_mute(io);
 353         return 0;
 354 }
 355
 356 MODULE_AUTHOR("Petr Vandrovec, vandrove@vc.cvut.cz and M. Kirkwood");
 357 MODULE_DESCRIPTION("A driver for the SF16MI radio.");
 358 MODULE_LICENSE("GPL");
 359
 360 module_param(io, int, 0);
 361 MODULE_PARM_DESC(io, "I/O address of the SF16MI card (0x284 or 0x384)");
 362 module_param(radio_nr, int, 0);
 363
 364 static void __exit fmi_cleanup_module(void)
 365 {
 366         video_unregister_device(&fmi_radio);
 367         release_region(io, 2);
 368         if (dev)
 369                 pnp_device_detach(dev);
 370 }
 371
 372 module_init(fmi_init);
 373 module_exit(fmi_cleanup_module);