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