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 vidioc_querycap(struct file *file, void  *priv,
 134                                         struct v4l2_capability *v)
 135 {
 136         strlcpy(v->driver, "radio-sf16fmi", sizeof(v->driver));
 137         strlcpy(v->card, "SF16-FMx radio", sizeof(v->card));
 138         sprintf(v->bus_info, "ISA");
 139         v->version = RADIO_VERSION;
 140         v->capabilities = V4L2_CAP_TUNER;
 141         return 0;
 142 }
 143
 144 static int vidioc_g_tuner(struct file *file, void *priv,
 145                                         struct v4l2_tuner *v)
 146 {
 147         int mult;
 148         struct video_device *dev = video_devdata(file);
 149         struct fmi_device *fmi = dev->priv;
 150
 151         if (v->index > 0)
 152                 return -EINVAL;
 153
 154         strcpy(v->name, "FM");
 155         v->type = V4L2_TUNER_RADIO;
 156         mult = (fmi->flags & V4L2_TUNER_CAP_LOW) ? 1 : 1000;
 157         v->rangelow = RSF16_MINFREQ/mult;
 158         v->rangehigh = RSF16_MAXFREQ/mult;
 159         v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_MODE_STEREO;
 160         v->capability = fmi->flags&V4L2_TUNER_CAP_LOW;
 161         v->audmode = V4L2_TUNER_MODE_STEREO;
 162         v->signal = fmi_getsigstr(fmi);
 163         return 0;
 164 }
 165
 166 static int vidioc_s_tuner(struct file *file, void *priv,
 167                                         struct v4l2_tuner *v)
 168 {
 169         if (v->index > 0)
 170                 return -EINVAL;
 171         return 0;
 172 }
 173
 174 static int vidioc_s_frequency(struct file *file, void *priv,
 175                                         struct v4l2_frequency *f)
 176 {
 177         struct video_device *dev = video_devdata(file);
 178         struct fmi_device *fmi = dev->priv;
 179
 180         if (!(fmi->flags & V4L2_TUNER_CAP_LOW))
 181                 f->frequency *= 1000;
 182         if (f->frequency < RSF16_MINFREQ ||
 183                         f->frequency > RSF16_MAXFREQ )
 184                 return -EINVAL;
 185         /*rounding in steps of 800 to match th freq
 186         that will be used */
 187         fmi->curfreq = (f->frequency/800)*800;
 188         fmi_setfreq(fmi);
 189         return 0;
 190 }
 191
 192 static int vidioc_g_frequency(struct file *file, void *priv,
 193                                         struct v4l2_frequency *f)
 194 {
 195         struct video_device *dev = video_devdata(file);
 196         struct fmi_device *fmi = dev->priv;
 197
 198         f->type = V4L2_TUNER_RADIO;
 199         f->frequency = fmi->curfreq;
 200         if (!(fmi->flags & V4L2_TUNER_CAP_LOW))
 201                 f->frequency /= 1000;
 202         return 0;
 203 }
 204
 205 static int vidioc_queryctrl(struct file *file, void *priv,
 206                                         struct v4l2_queryctrl *qc)
 207 {
 208         int i;
 209
 210         for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
 211                 if (qc->id && qc->id == radio_qctrl[i].id) {
 212                         memcpy(qc, &(radio_qctrl[i]),
 213                                                 sizeof(*qc));
 214                         return 0;
 215                 }
 216         }
 217         return -EINVAL;
 218 }
 219
 220 static int vidioc_g_ctrl(struct file *file, void *priv,
 221                                         struct v4l2_control *ctrl)
 222 {
 223         struct video_device *dev = video_devdata(file);
 224         struct fmi_device *fmi = dev->priv;
 225
 226         switch (ctrl->id) {
 227         case V4L2_CID_AUDIO_MUTE:
 228                 ctrl->value = fmi->curvol;
 229                 return 0;
 230         }
 231         return -EINVAL;
 232 }
 233
 234 static int vidioc_s_ctrl(struct file *file, void *priv,
 235                                         struct v4l2_control *ctrl)
 236 {
 237         struct video_device *dev = video_devdata(file);
 238         struct fmi_device *fmi = dev->priv;
 239
 240         switch (ctrl->id) {
 241         case V4L2_CID_AUDIO_MUTE:
 242                 if (ctrl->value)
 243                         fmi_mute(fmi->port);
 244                 else
 245                         fmi_unmute(fmi->port);
 246                 fmi->curvol = ctrl->value;
 247                 return 0;
 248         }
 249         return -EINVAL;
 250 }
 251
 252 static int vidioc_g_audio(struct file *file, void *priv,
 253                                         struct v4l2_audio *a)
 254 {
 255         if (a->index > 1)
 256                 return -EINVAL;
 257
 258         strcpy(a->name, "Radio");
 259         a->capability = V4L2_AUDCAP_STEREO;
 260         return 0;
 261 }
 262
 263 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 264 {
 265         *i = 0;
 266         return 0;
 267 }
 268
 269 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 270 {
 271         if (i != 0)
 272                 return -EINVAL;
 273         return 0;
 274 }
 275
 276 static int vidioc_s_audio(struct file *file, void *priv,
 277                                         struct v4l2_audio *a)
 278 {
 279         if (a->index != 0)
 280                 return -EINVAL;
 281         return 0;
 282 }
 283
 284 static struct fmi_device fmi_unit;
 285
 286 static const struct file_operations fmi_fops = {
 287         .owner          = THIS_MODULE,
 288         .open           = video_exclusive_open,
 289         .release        = video_exclusive_release,
 290         .ioctl          = video_ioctl2,
 291         .compat_ioctl   = v4l_compat_ioctl32,
 292         .llseek         = no_llseek,
 293 };
 294
 295 static struct video_device fmi_radio=
 296 {
 297         .owner          = THIS_MODULE,
 298         .name           = "SF16FMx radio",
 299         .type           = VID_TYPE_TUNER,
 300         .fops           = &fmi_fops,
 301         .vidioc_querycap    = vidioc_querycap,
 302         .vidioc_g_tuner     = vidioc_g_tuner,
 303         .vidioc_s_tuner     = vidioc_s_tuner,
 304         .vidioc_g_audio     = vidioc_g_audio,
 305         .vidioc_s_audio     = vidioc_s_audio,
 306         .vidioc_g_input     = vidioc_g_input,
 307         .vidioc_s_input     = vidioc_s_input,
 308         .vidioc_g_frequency = vidioc_g_frequency,
 309         .vidioc_s_frequency = vidioc_s_frequency,
 310         .vidioc_queryctrl   = vidioc_queryctrl,
 311         .vidioc_g_ctrl      = vidioc_g_ctrl,
 312         .vidioc_s_ctrl      = vidioc_s_ctrl,
 313 };
 314
 315 /* ladis: this is my card. does any other types exist? */
 316 static struct isapnp_device_id id_table[] __devinitdata = {
 317         {       ISAPNP_ANY_ID, ISAPNP_ANY_ID,
 318                 ISAPNP_VENDOR('M','F','R'), ISAPNP_FUNCTION(0xad10), 0},
 319         {       ISAPNP_CARD_END, },
 320 };
 321
 322 MODULE_DEVICE_TABLE(isapnp, id_table);
 323
 324 static int isapnp_fmi_probe(void)
 325 {
 326         int i = 0;
 327
 328         while (id_table[i].card_vendor != 0 && dev == NULL) {
 329                 dev = pnp_find_dev(NULL, id_table[i].vendor,
 330                                    id_table[i].function, NULL);
 331                 i++;
 332         }
 333
 334         if (!dev)
 335                 return -ENODEV;
 336         if (pnp_device_attach(dev) < 0)
 337                 return -EAGAIN;
 338         if (pnp_activate_dev(dev) < 0) {
 339                 printk ("radio-sf16fmi: PnP configure failed (out of resources?)\n");
 340                 pnp_device_detach(dev);
 341                 return -ENOMEM;
 342         }
 343         if (!pnp_port_valid(dev, 0)) {
 344                 pnp_device_detach(dev);
 345                 return -ENODEV;
 346         }
 347
 348         i = pnp_port_start(dev, 0);
 349         printk ("radio-sf16fmi: PnP reports card at %#x\n", i);
 350
 351         return i;
 352 }
 353
 354 static int __init fmi_init(void)
 355 {
 356         if (io < 0)
 357                 io = isapnp_fmi_probe();
 358         if (io < 0) {
 359                 printk(KERN_ERR "radio-sf16fmi: No PnP card found.\n");
 360                 return io;
 361         }
 362         if (!request_region(io, 2, "radio-sf16fmi")) {
 363                 printk(KERN_ERR "radio-sf16fmi: port 0x%x already in use\n", io);
 364                 return -EBUSY;
 365         }
 366
 367         fmi_unit.port = io;
 368         fmi_unit.curvol = 0;
 369         fmi_unit.curfreq = 0;
 370         fmi_unit.flags = V4L2_TUNER_CAP_LOW;
 371         fmi_radio.priv = &fmi_unit;
 372
 373         mutex_init(&lock);
 374
 375         if (video_register_device(&fmi_radio, VFL_TYPE_RADIO, radio_nr) == -1) {
 376                 release_region(io, 2);
 377                 return -EINVAL;
 378         }
 379
 380         printk(KERN_INFO "SF16FMx radio card driver at 0x%x\n", io);
 381         /* mute card - prevents noisy bootups */
 382         fmi_mute(io);
 383         return 0;
 384 }
 385
 386 MODULE_AUTHOR("Petr Vandrovec, vandrove@vc.cvut.cz and M. Kirkwood");
 387 MODULE_DESCRIPTION("A driver for the SF16MI radio.");
 388 MODULE_LICENSE("GPL");
 389
 390 module_param(io, int, 0);
 391 MODULE_PARM_DESC(io, "I/O address of the SF16MI card (0x284 or 0x384)");
 392 module_param(radio_nr, int, 0);
 393
 394 static void __exit fmi_cleanup_module(void)
 395 {
 396         video_unregister_device(&fmi_radio);
 397         release_region(io, 2);
 398         if (dev)
 399                 pnp_device_detach(dev);
 400 }
 401
 402 module_init(fmi_init);
 403 module_exit(fmi_cleanup_module);