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@lxorguk.ukuu.org.uk>
   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 fmi_device *fmi = video_drvdata(file);
 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 fmi_device *fmi = video_drvdata(file);
 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 fmi_device *fmi = video_drvdata(file);
 196
 197         f->type = V4L2_TUNER_RADIO;
 198         f->frequency = fmi->curfreq;
 199         if (!(fmi->flags & V4L2_TUNER_CAP_LOW))
 200                 f->frequency /= 1000;
 201         return 0;
 202 }
 203
 204 static int vidioc_queryctrl(struct file *file, void *priv,
 205                                         struct v4l2_queryctrl *qc)
 206 {
 207         int i;
 208
 209         for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
 210                 if (qc->id && qc->id == radio_qctrl[i].id) {
 211                         memcpy(qc, &(radio_qctrl[i]),
 212                                                 sizeof(*qc));
 213                         return 0;
 214                 }
 215         }
 216         return -EINVAL;
 217 }
 218
 219 static int vidioc_g_ctrl(struct file *file, void *priv,
 220                                         struct v4l2_control *ctrl)
 221 {
 222         struct fmi_device *fmi = video_drvdata(file);
 223
 224         switch (ctrl->id) {
 225         case V4L2_CID_AUDIO_MUTE:
 226                 ctrl->value = fmi->curvol;
 227                 return 0;
 228         }
 229         return -EINVAL;
 230 }
 231
 232 static int vidioc_s_ctrl(struct file *file, void *priv,
 233                                         struct v4l2_control *ctrl)
 234 {
 235         struct fmi_device *fmi = video_drvdata(file);
 236
 237         switch (ctrl->id) {
 238         case V4L2_CID_AUDIO_MUTE:
 239                 if (ctrl->value)
 240                         fmi_mute(fmi->port);
 241                 else
 242                         fmi_unmute(fmi->port);
 243                 fmi->curvol = ctrl->value;
 244                 return 0;
 245         }
 246         return -EINVAL;
 247 }
 248
 249 static int vidioc_g_audio(struct file *file, void *priv,
 250                                         struct v4l2_audio *a)
 251 {
 252         if (a->index > 1)
 253                 return -EINVAL;
 254
 255         strcpy(a->name, "Radio");
 256         a->capability = V4L2_AUDCAP_STEREO;
 257         return 0;
 258 }
 259
 260 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 261 {
 262         *i = 0;
 263         return 0;
 264 }
 265
 266 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 267 {
 268         if (i != 0)
 269                 return -EINVAL;
 270         return 0;
 271 }
 272
 273 static int vidioc_s_audio(struct file *file, void *priv,
 274                                         struct v4l2_audio *a)
 275 {
 276         if (a->index != 0)
 277                 return -EINVAL;
 278         return 0;
 279 }
 280
 281 static struct fmi_device fmi_unit;
 282
 283 static int fmi_exclusive_open(struct file *file)
 284 {
 285         return test_and_set_bit(0, &fmi_unit.in_use) ? -EBUSY : 0;
 286 }
 287
 288 static int fmi_exclusive_release(struct file *file)
 289 {
 290         clear_bit(0, &fmi_unit.in_use);
 291         return 0;
 292 }
 293
 294 static const struct v4l2_file_operations fmi_fops = {
 295         .owner          = THIS_MODULE,
 296         .open           = fmi_exclusive_open,
 297         .release        = fmi_exclusive_release,
 298         .ioctl          = video_ioctl2,
 299 };
 300
 301 static const struct v4l2_ioctl_ops fmi_ioctl_ops = {
 302         .vidioc_querycap    = vidioc_querycap,
 303         .vidioc_g_tuner     = vidioc_g_tuner,
 304         .vidioc_s_tuner     = vidioc_s_tuner,
 305         .vidioc_g_audio     = vidioc_g_audio,
 306         .vidioc_s_audio     = vidioc_s_audio,
 307         .vidioc_g_input     = vidioc_g_input,
 308         .vidioc_s_input     = vidioc_s_input,
 309         .vidioc_g_frequency = vidioc_g_frequency,
 310         .vidioc_s_frequency = vidioc_s_frequency,
 311         .vidioc_queryctrl   = vidioc_queryctrl,
 312         .vidioc_g_ctrl      = vidioc_g_ctrl,
 313         .vidioc_s_ctrl      = vidioc_s_ctrl,
 314 };
 315
 316 static struct video_device fmi_radio = {
 317         .name           = "SF16FMx radio",
 318         .fops           = &fmi_fops,
 319         .ioctl_ops      = &fmi_ioctl_ops,
 320         .release        = video_device_release_empty,
 321 };
 322
 323 /* ladis: this is my card. does any other types exist? */
 324 static struct isapnp_device_id id_table[] __devinitdata = {
 325         {       ISAPNP_ANY_ID, ISAPNP_ANY_ID,
 326                 ISAPNP_VENDOR('M','F','R'), ISAPNP_FUNCTION(0xad10), 0},
 327         {       ISAPNP_CARD_END, },
 328 };
 329
 330 MODULE_DEVICE_TABLE(isapnp, id_table);
 331
 332 static int __init isapnp_fmi_probe(void)
 333 {
 334         int i = 0;
 335
 336         while (id_table[i].card_vendor != 0 && dev == NULL) {
 337                 dev = pnp_find_dev(NULL, id_table[i].vendor,
 338                                    id_table[i].function, NULL);
 339                 i++;
 340         }
 341
 342         if (!dev)
 343                 return -ENODEV;
 344         if (pnp_device_attach(dev) < 0)
 345                 return -EAGAIN;
 346         if (pnp_activate_dev(dev) < 0) {
 347                 printk ("radio-sf16fmi: PnP configure failed (out of resources?)\n");
 348                 pnp_device_detach(dev);
 349                 return -ENOMEM;
 350         }
 351         if (!pnp_port_valid(dev, 0)) {
 352                 pnp_device_detach(dev);
 353                 return -ENODEV;
 354         }
 355
 356         i = pnp_port_start(dev, 0);
 357         printk ("radio-sf16fmi: PnP reports card at %#x\n", i);
 358
 359         return i;
 360 }
 361
 362 static int __init fmi_init(void)
 363 {
 364         if (io < 0)
 365                 io = isapnp_fmi_probe();
 366         if (io < 0) {
 367                 printk(KERN_ERR "radio-sf16fmi: No PnP card found.\n");
 368                 return io;
 369         }
 370         if (!request_region(io, 2, "radio-sf16fmi")) {
 371                 printk(KERN_ERR "radio-sf16fmi: port 0x%x already in use\n", io);
 372                 pnp_device_detach(dev);
 373                 return -EBUSY;
 374         }
 375
 376         fmi_unit.port = io;
 377         fmi_unit.curvol = 0;
 378         fmi_unit.curfreq = 0;
 379         fmi_unit.flags = V4L2_TUNER_CAP_LOW;
 380         video_set_drvdata(&fmi_radio, &fmi_unit);
 381
 382         mutex_init(&lock);
 383
 384         if (video_register_device(&fmi_radio, VFL_TYPE_RADIO, radio_nr) < 0) {
 385                 release_region(io, 2);
 386                 return -EINVAL;
 387         }
 388
 389         printk(KERN_INFO "SF16FMx radio card driver at 0x%x\n", io);
 390         /* mute card - prevents noisy bootups */
 391         fmi_mute(io);
 392         return 0;
 393 }
 394
 395 MODULE_AUTHOR("Petr Vandrovec, vandrove@vc.cvut.cz and M. Kirkwood");
 396 MODULE_DESCRIPTION("A driver for the SF16MI radio.");
 397 MODULE_LICENSE("GPL");
 398
 399 module_param(io, int, 0);
 400 MODULE_PARM_DESC(io, "I/O address of the SF16MI card (0x284 or 0x384)");
 401 module_param(radio_nr, int, 0);
 402
 403 static void __exit fmi_cleanup_module(void)
 404 {
 405         video_unregister_device(&fmi_radio);
 406         release_region(io, 2);
 407         if (dev)
 408                 pnp_device_detach(dev);
 409 }
 410
 411 module_init(fmi_init);
 412 module_exit(fmi_cleanup_module);