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         unsigned long in_use;
  49         int port;
  50         int curvol; /* 1 or 0 */
  51         unsigned long curfreq; /* freq in kHz */
  52         __u32 flags;
  53 };
  54
  55 static int io = -1;
  56 static int radio_nr = -1;
  57 static struct pnp_dev *dev = NULL;
  58 static struct mutex lock;
  59
  60 /* freq is in 1/16 kHz to internal number, hw precision is 50 kHz */
  61 /* It is only useful to give freq in intervall of 800 (=0.05Mhz),
  62  * other bits will be truncated, e.g 92.7400016 -> 92.7, but
  63  * 92.7400017 -> 92.75
  64  */
  65 #define RSF16_ENCODE(x) ((x)/800+214)
  66 #define RSF16_MINFREQ 87*16000
  67 #define RSF16_MAXFREQ 108*16000
  68
  69 static void outbits(int bits, unsigned int data, int port)
  70 {
  71         while(bits--) {
  72                 if(data & 1) {
  73                         outb(5, port);
  74                         udelay(6);
  75                         outb(7, port);
  76                         udelay(6);
  77                 } else {
  78                         outb(1, port);
  79                         udelay(6);
  80                         outb(3, port);
  81                         udelay(6);
  82                 }
  83                 data>>=1;
  84         }
  85 }
  86
  87 static inline void fmi_mute(int port)
  88 {
  89         mutex_lock(&lock);
  90         outb(0x00, port);
  91         mutex_unlock(&lock);
  92 }
  93
  94 static inline void fmi_unmute(int port)
  95 {
  96         mutex_lock(&lock);
  97         outb(0x08, port);
  98         mutex_unlock(&lock);
  99 }
 100
 101 static inline int fmi_setfreq(struct fmi_device *dev)
 102 {
 103         int myport = dev->port;
 104         unsigned long freq = dev->curfreq;
 105
 106         mutex_lock(&lock);
 107
 108         outbits(16, RSF16_ENCODE(freq), myport);
 109         outbits(8, 0xC0, myport);
 110         msleep(143);            /* was schedule_timeout(HZ/7) */
 111         mutex_unlock(&lock);
 112         if (dev->curvol) fmi_unmute(myport);
 113         return 0;
 114 }
 115
 116 static inline int fmi_getsigstr(struct fmi_device *dev)
 117 {
 118         int val;
 119         int res;
 120         int myport = dev->port;
 121
 122
 123         mutex_lock(&lock);
 124         val = dev->curvol ? 0x08 : 0x00;        /* unmute/mute */
 125         outb(val, myport);
 126         outb(val | 0x10, myport);
 127         msleep(143);            /* was schedule_timeout(HZ/7) */
 128         res = (int)inb(myport+1);
 129         outb(val, myport);
 130
 131         mutex_unlock(&lock);
 132         return (res & 2) ? 0 : 0xFFFF;
 133 }
 134
 135 static int vidioc_querycap(struct file *file, void  *priv,
 136                                         struct v4l2_capability *v)
 137 {
 138         strlcpy(v->driver, "radio-sf16fmi", sizeof(v->driver));
 139         strlcpy(v->card, "SF16-FMx radio", sizeof(v->card));
 140         sprintf(v->bus_info, "ISA");
 141         v->version = RADIO_VERSION;
 142         v->capabilities = V4L2_CAP_TUNER;
 143         return 0;
 144 }
 145
 146 static int vidioc_g_tuner(struct file *file, void *priv,
 147                                         struct v4l2_tuner *v)
 148 {
 149         int mult;
 150         struct video_device *dev = video_devdata(file);
 151         struct fmi_device *fmi = video_get_drvdata(dev);
 152
 153         if (v->index > 0)
 154                 return -EINVAL;
 155
 156         strcpy(v->name, "FM");
 157         v->type = V4L2_TUNER_RADIO;
 158         mult = (fmi->flags & V4L2_TUNER_CAP_LOW) ? 1 : 1000;
 159         v->rangelow = RSF16_MINFREQ/mult;
 160         v->rangehigh = RSF16_MAXFREQ/mult;
 161         v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_MODE_STEREO;
 162         v->capability = fmi->flags&V4L2_TUNER_CAP_LOW;
 163         v->audmode = V4L2_TUNER_MODE_STEREO;
 164         v->signal = fmi_getsigstr(fmi);
 165         return 0;
 166 }
 167
 168 static int vidioc_s_tuner(struct file *file, void *priv,
 169                                         struct v4l2_tuner *v)
 170 {
 171         if (v->index > 0)
 172                 return -EINVAL;
 173         return 0;
 174 }
 175
 176 static int vidioc_s_frequency(struct file *file, void *priv,
 177                                         struct v4l2_frequency *f)
 178 {
 179         struct video_device *dev = video_devdata(file);
 180         struct fmi_device *fmi = video_get_drvdata(dev);
 181
 182         if (!(fmi->flags & V4L2_TUNER_CAP_LOW))
 183                 f->frequency *= 1000;
 184         if (f->frequency < RSF16_MINFREQ ||
 185                         f->frequency > RSF16_MAXFREQ )
 186                 return -EINVAL;
 187         /*rounding in steps of 800 to match th freq
 188         that will be used */
 189         fmi->curfreq = (f->frequency/800)*800;
 190         fmi_setfreq(fmi);
 191         return 0;
 192 }
 193
 194 static int vidioc_g_frequency(struct file *file, void *priv,
 195                                         struct v4l2_frequency *f)
 196 {
 197         struct video_device *dev = video_devdata(file);
 198         struct fmi_device *fmi = video_get_drvdata(dev);
 199
 200         f->type = V4L2_TUNER_RADIO;
 201         f->frequency = fmi->curfreq;
 202         if (!(fmi->flags & V4L2_TUNER_CAP_LOW))
 203                 f->frequency /= 1000;
 204         return 0;
 205 }
 206
 207 static int vidioc_queryctrl(struct file *file, void *priv,
 208                                         struct v4l2_queryctrl *qc)
 209 {
 210         int i;
 211
 212         for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
 213                 if (qc->id && qc->id == radio_qctrl[i].id) {
 214                         memcpy(qc, &(radio_qctrl[i]),
 215                                                 sizeof(*qc));
 216                         return 0;
 217                 }
 218         }
 219         return -EINVAL;
 220 }
 221
 222 static int vidioc_g_ctrl(struct file *file, void *priv,
 223                                         struct v4l2_control *ctrl)
 224 {
 225         struct video_device *dev = video_devdata(file);
 226         struct fmi_device *fmi = video_get_drvdata(dev);
 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
 236 static int vidioc_s_ctrl(struct file *file, void *priv,
 237                                         struct v4l2_control *ctrl)
 238 {
 239         struct video_device *dev = video_devdata(file);
 240         struct fmi_device *fmi = video_get_drvdata(dev);
 241
 242         switch (ctrl->id) {
 243         case V4L2_CID_AUDIO_MUTE:
 244                 if (ctrl->value)
 245                         fmi_mute(fmi->port);
 246                 else
 247                         fmi_unmute(fmi->port);
 248                 fmi->curvol = ctrl->value;
 249                 return 0;
 250         }
 251         return -EINVAL;
 252 }
 253
 254 static int vidioc_g_audio(struct file *file, void *priv,
 255                                         struct v4l2_audio *a)
 256 {
 257         if (a->index > 1)
 258                 return -EINVAL;
 259
 260         strcpy(a->name, "Radio");
 261         a->capability = V4L2_AUDCAP_STEREO;
 262         return 0;
 263 }
 264
 265 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 266 {
 267         *i = 0;
 268         return 0;
 269 }
 270
 271 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 272 {
 273         if (i != 0)
 274                 return -EINVAL;
 275         return 0;
 276 }
 277
 278 static int vidioc_s_audio(struct file *file, void *priv,
 279                                         struct v4l2_audio *a)
 280 {
 281         if (a->index != 0)
 282                 return -EINVAL;
 283         return 0;
 284 }
 285
 286 static struct fmi_device fmi_unit;
 287
 288 static int fmi_exclusive_open(struct inode *inode, struct file *file)
 289 {
 290         return test_and_set_bit(0, &fmi_unit.in_use) ? -EBUSY : 0;
 291 }
 292
 293 static int fmi_exclusive_release(struct inode *inode, struct file *file)
 294 {
 295         clear_bit(0, &fmi_unit.in_use);
 296         return 0;
 297 }
 298
 299 static const struct file_operations fmi_fops = {
 300         .owner          = THIS_MODULE,
 301         .open           = fmi_exclusive_open,
 302         .release        = fmi_exclusive_release,
 303         .ioctl          = video_ioctl2,
 304 #ifdef CONFIG_COMPAT
 305         .compat_ioctl   = v4l_compat_ioctl32,
 306 #endif
 307         .llseek         = no_llseek,
 308 };
 309
 310 static const struct v4l2_ioctl_ops fmi_ioctl_ops = {
 311         .vidioc_querycap    = vidioc_querycap,
 312         .vidioc_g_tuner     = vidioc_g_tuner,
 313         .vidioc_s_tuner     = vidioc_s_tuner,
 314         .vidioc_g_audio     = vidioc_g_audio,
 315         .vidioc_s_audio     = vidioc_s_audio,
 316         .vidioc_g_input     = vidioc_g_input,
 317         .vidioc_s_input     = vidioc_s_input,
 318         .vidioc_g_frequency = vidioc_g_frequency,
 319         .vidioc_s_frequency = vidioc_s_frequency,
 320         .vidioc_queryctrl   = vidioc_queryctrl,
 321         .vidioc_g_ctrl      = vidioc_g_ctrl,
 322         .vidioc_s_ctrl      = vidioc_s_ctrl,
 323 };
 324
 325 static struct video_device fmi_radio = {
 326         .name           = "SF16FMx radio",
 327         .fops           = &fmi_fops,
 328         .ioctl_ops      = &fmi_ioctl_ops,
 329         .release        = video_device_release_empty,
 330 };
 331
 332 /* ladis: this is my card. does any other types exist? */
 333 static struct isapnp_device_id id_table[] __devinitdata = {
 334         {       ISAPNP_ANY_ID, ISAPNP_ANY_ID,
 335                 ISAPNP_VENDOR('M','F','R'), ISAPNP_FUNCTION(0xad10), 0},
 336         {       ISAPNP_CARD_END, },
 337 };
 338
 339 MODULE_DEVICE_TABLE(isapnp, id_table);
 340
 341 static int __init isapnp_fmi_probe(void)
 342 {
 343         int i = 0;
 344
 345         while (id_table[i].card_vendor != 0 && dev == NULL) {
 346                 dev = pnp_find_dev(NULL, id_table[i].vendor,
 347                                    id_table[i].function, NULL);
 348                 i++;
 349         }
 350
 351         if (!dev)
 352                 return -ENODEV;
 353         if (pnp_device_attach(dev) < 0)
 354                 return -EAGAIN;
 355         if (pnp_activate_dev(dev) < 0) {
 356                 printk ("radio-sf16fmi: PnP configure failed (out of resources?)\n");
 357                 pnp_device_detach(dev);
 358                 return -ENOMEM;
 359         }
 360         if (!pnp_port_valid(dev, 0)) {
 361                 pnp_device_detach(dev);
 362                 return -ENODEV;
 363         }
 364
 365         i = pnp_port_start(dev, 0);
 366         printk ("radio-sf16fmi: PnP reports card at %#x\n", i);
 367
 368         return i;
 369 }
 370
 371 static int __init fmi_init(void)
 372 {
 373         if (io < 0)
 374                 io = isapnp_fmi_probe();
 375         if (io < 0) {
 376                 printk(KERN_ERR "radio-sf16fmi: No PnP card found.\n");
 377                 return io;
 378         }
 379         if (!request_region(io, 2, "radio-sf16fmi")) {
 380                 printk(KERN_ERR "radio-sf16fmi: port 0x%x already in use\n", io);
 381                 pnp_device_detach(dev);
 382                 return -EBUSY;
 383         }
 384
 385         fmi_unit.port = io;
 386         fmi_unit.curvol = 0;
 387         fmi_unit.curfreq = 0;
 388         fmi_unit.flags = V4L2_TUNER_CAP_LOW;
 389         video_set_drvdata(&fmi_radio, &fmi_unit);
 390
 391         mutex_init(&lock);
 392
 393         if (video_register_device(&fmi_radio, VFL_TYPE_RADIO, radio_nr) < 0) {
 394                 release_region(io, 2);
 395                 return -EINVAL;
 396         }
 397
 398         printk(KERN_INFO "SF16FMx radio card driver at 0x%x\n", io);
 399         /* mute card - prevents noisy bootups */
 400         fmi_mute(io);
 401         return 0;
 402 }
 403
 404 MODULE_AUTHOR("Petr Vandrovec, vandrove@vc.cvut.cz and M. Kirkwood");
 405 MODULE_DESCRIPTION("A driver for the SF16MI radio.");
 406 MODULE_LICENSE("GPL");
 407
 408 module_param(io, int, 0);
 409 MODULE_PARM_DESC(io, "I/O address of the SF16MI card (0x284 or 0x384)");
 410 module_param(radio_nr, int, 0);
 411
 412 static void __exit fmi_cleanup_module(void)
 413 {
 414         video_unregister_device(&fmi_radio);
 415         release_region(io, 2);
 416         if (dev)
 417                 pnp_device_detach(dev);
 418 }
 419
 420 module_init(fmi_init);
 421 module_exit(fmi_cleanup_module);