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/isapnp.h>
  26 #include <linux/mutex.h>
  27 #include <linux/videodev2.h>    /* kernel radio structs         */
  28 #include <linux/io.h>           /* outb, outb_p                 */
  29 #include <media/v4l2-device.h>
  30 #include <media/v4l2-ioctl.h>
  31
  32 MODULE_AUTHOR("Petr Vandrovec, vandrove@vc.cvut.cz and M. Kirkwood");
  33 MODULE_DESCRIPTION("A driver for the SF16MI radio.");
  34 MODULE_LICENSE("GPL");
  35
  36 static int io = -1;
  37 static int radio_nr = -1;
  38
  39 module_param(io, int, 0);
  40 MODULE_PARM_DESC(io, "I/O address of the SF16MI card (0x284 or 0x384)");
  41 module_param(radio_nr, int, 0);
  42
  43 #define RADIO_VERSION KERNEL_VERSION(0, 0, 2)
  44
  45 struct fmi
  46 {
  47         struct v4l2_device v4l2_dev;
  48         struct video_device vdev;
  49         int io;
  50         int curvol; /* 1 or 0 */
  51         unsigned long curfreq; /* freq in kHz */
  52         struct mutex lock;
  53 };
  54
  55 static struct fmi fmi_card;
  56 static struct pnp_dev *dev;
  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 interval 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 io)
  68 {
  69         while (bits--) {
  70                 if (data & 1) {
  71                         outb(5, io);
  72                         udelay(6);
  73                         outb(7, io);
  74                         udelay(6);
  75                 } else {
  76                         outb(1, io);
  77                         udelay(6);
  78                         outb(3, io);
  79                         udelay(6);
  80                 }
  81                 data >>= 1;
  82         }
  83 }
  84
  85 static inline void fmi_mute(struct fmi *fmi)
  86 {
  87         mutex_lock(&fmi->lock);
  88         outb(0x00, fmi->io);
  89         mutex_unlock(&fmi->lock);
  90 }
  91
  92 static inline void fmi_unmute(struct fmi *fmi)
  93 {
  94         mutex_lock(&fmi->lock);
  95         outb(0x08, fmi->io);
  96         mutex_unlock(&fmi->lock);
  97 }
  98
  99 static inline int fmi_setfreq(struct fmi *fmi, unsigned long freq)
 100 {
 101         mutex_lock(&fmi->lock);
 102         fmi->curfreq = freq;
 103
 104         outbits(16, RSF16_ENCODE(freq), fmi->io);
 105         outbits(8, 0xC0, fmi->io);
 106         msleep(143);            /* was schedule_timeout(HZ/7) */
 107         mutex_unlock(&fmi->lock);
 108         if (fmi->curvol)
 109                 fmi_unmute(fmi);
 110         return 0;
 111 }
 112
 113 static inline int fmi_getsigstr(struct fmi *fmi)
 114 {
 115         int val;
 116         int res;
 117
 118         mutex_lock(&fmi->lock);
 119         val = fmi->curvol ? 0x08 : 0x00;        /* unmute/mute */
 120         outb(val, fmi->io);
 121         outb(val | 0x10, fmi->io);
 122         msleep(143);            /* was schedule_timeout(HZ/7) */
 123         res = (int)inb(fmi->io + 1);
 124         outb(val, fmi->io);
 125
 126         mutex_unlock(&fmi->lock);
 127         return (res & 2) ? 0 : 0xFFFF;
 128 }
 129
 130 static int vidioc_querycap(struct file *file, void  *priv,
 131                                         struct v4l2_capability *v)
 132 {
 133         strlcpy(v->driver, "radio-sf16fmi", sizeof(v->driver));
 134         strlcpy(v->card, "SF16-FMx radio", sizeof(v->card));
 135         strlcpy(v->bus_info, "ISA", sizeof(v->bus_info));
 136         v->version = RADIO_VERSION;
 137         v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
 138         return 0;
 139 }
 140
 141 static int vidioc_g_tuner(struct file *file, void *priv,
 142                                         struct v4l2_tuner *v)
 143 {
 144         struct fmi *fmi = video_drvdata(file);
 145
 146         if (v->index > 0)
 147                 return -EINVAL;
 148
 149         strlcpy(v->name, "FM", sizeof(v->name));
 150         v->type = V4L2_TUNER_RADIO;
 151         v->rangelow = RSF16_MINFREQ;
 152         v->rangehigh = RSF16_MAXFREQ;
 153         v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
 154         v->capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_LOW;
 155         v->audmode = V4L2_TUNER_MODE_STEREO;
 156         v->signal = fmi_getsigstr(fmi);
 157         return 0;
 158 }
 159
 160 static int vidioc_s_tuner(struct file *file, void *priv,
 161                                         struct v4l2_tuner *v)
 162 {
 163         return v->index ? -EINVAL : 0;
 164 }
 165
 166 static int vidioc_s_frequency(struct file *file, void *priv,
 167                                         struct v4l2_frequency *f)
 168 {
 169         struct fmi *fmi = video_drvdata(file);
 170
 171         if (f->frequency < RSF16_MINFREQ ||
 172                         f->frequency > RSF16_MAXFREQ)
 173                 return -EINVAL;
 174         /* rounding in steps of 800 to match the freq
 175            that will be used */
 176         fmi_setfreq(fmi, (f->frequency / 800) * 800);
 177         return 0;
 178 }
 179
 180 static int vidioc_g_frequency(struct file *file, void *priv,
 181                                         struct v4l2_frequency *f)
 182 {
 183         struct fmi *fmi = video_drvdata(file);
 184
 185         f->type = V4L2_TUNER_RADIO;
 186         f->frequency = fmi->curfreq;
 187         return 0;
 188 }
 189
 190 static int vidioc_queryctrl(struct file *file, void *priv,
 191                                         struct v4l2_queryctrl *qc)
 192 {
 193         switch (qc->id) {
 194         case V4L2_CID_AUDIO_MUTE:
 195                 return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
 196         }
 197         return -EINVAL;
 198 }
 199
 200 static int vidioc_g_ctrl(struct file *file, void *priv,
 201                                         struct v4l2_control *ctrl)
 202 {
 203         struct fmi *fmi = video_drvdata(file);
 204
 205         switch (ctrl->id) {
 206         case V4L2_CID_AUDIO_MUTE:
 207                 ctrl->value = fmi->curvol;
 208                 return 0;
 209         }
 210         return -EINVAL;
 211 }
 212
 213 static int vidioc_s_ctrl(struct file *file, void *priv,
 214                                         struct v4l2_control *ctrl)
 215 {
 216         struct fmi *fmi = video_drvdata(file);
 217
 218         switch (ctrl->id) {
 219         case V4L2_CID_AUDIO_MUTE:
 220                 if (ctrl->value)
 221                         fmi_mute(fmi);
 222                 else
 223                         fmi_unmute(fmi);
 224                 fmi->curvol = ctrl->value;
 225                 return 0;
 226         }
 227         return -EINVAL;
 228 }
 229
 230 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 231 {
 232         *i = 0;
 233         return 0;
 234 }
 235
 236 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 237 {
 238         return i ? -EINVAL : 0;
 239 }
 240
 241 static int vidioc_g_audio(struct file *file, void *priv,
 242                                         struct v4l2_audio *a)
 243 {
 244         a->index = 0;
 245         strlcpy(a->name, "Radio", sizeof(a->name));
 246         a->capability = V4L2_AUDCAP_STEREO;
 247         return 0;
 248 }
 249
 250 static int vidioc_s_audio(struct file *file, void *priv,
 251                                         struct v4l2_audio *a)
 252 {
 253         return a->index ? -EINVAL : 0;
 254 }
 255
 256 static const struct v4l2_file_operations fmi_fops = {
 257         .owner          = THIS_MODULE,
 258         .ioctl          = video_ioctl2,
 259 };
 260
 261 static const struct v4l2_ioctl_ops fmi_ioctl_ops = {
 262         .vidioc_querycap    = vidioc_querycap,
 263         .vidioc_g_tuner     = vidioc_g_tuner,
 264         .vidioc_s_tuner     = vidioc_s_tuner,
 265         .vidioc_g_audio     = vidioc_g_audio,
 266         .vidioc_s_audio     = vidioc_s_audio,
 267         .vidioc_g_input     = vidioc_g_input,
 268         .vidioc_s_input     = vidioc_s_input,
 269         .vidioc_g_frequency = vidioc_g_frequency,
 270         .vidioc_s_frequency = vidioc_s_frequency,
 271         .vidioc_queryctrl   = vidioc_queryctrl,
 272         .vidioc_g_ctrl      = vidioc_g_ctrl,
 273         .vidioc_s_ctrl      = vidioc_s_ctrl,
 274 };
 275
 276 /* ladis: this is my card. does any other types exist? */
 277 static struct isapnp_device_id id_table[] __devinitdata = {
 278         {       ISAPNP_ANY_ID, ISAPNP_ANY_ID,
 279                 ISAPNP_VENDOR('M','F','R'), ISAPNP_FUNCTION(0xad10), 0},
 280         {       ISAPNP_CARD_END, },
 281 };
 282
 283 MODULE_DEVICE_TABLE(isapnp, id_table);
 284
 285 static int __init isapnp_fmi_probe(void)
 286 {
 287         int i = 0;
 288
 289         while (id_table[i].card_vendor != 0 && dev == NULL) {
 290                 dev = pnp_find_dev(NULL, id_table[i].vendor,
 291                                    id_table[i].function, NULL);
 292                 i++;
 293         }
 294
 295         if (!dev)
 296                 return -ENODEV;
 297         if (pnp_device_attach(dev) < 0)
 298                 return -EAGAIN;
 299         if (pnp_activate_dev(dev) < 0) {
 300                 printk(KERN_ERR "radio-sf16fmi: PnP configure failed (out of resources?)\n");
 301                 pnp_device_detach(dev);
 302                 return -ENOMEM;
 303         }
 304         if (!pnp_port_valid(dev, 0)) {
 305                 pnp_device_detach(dev);
 306                 return -ENODEV;
 307         }
 308
 309         i = pnp_port_start(dev, 0);
 310         printk(KERN_INFO "radio-sf16fmi: PnP reports card at %#x\n", i);
 311
 312         return i;
 313 }
 314
 315 static int __init fmi_init(void)
 316 {
 317         struct fmi *fmi = &fmi_card;
 318         struct v4l2_device *v4l2_dev = &fmi->v4l2_dev;
 319         int res;
 320
 321         if (io < 0)
 322                 io = isapnp_fmi_probe();
 323         strlcpy(v4l2_dev->name, "sf16fmi", sizeof(v4l2_dev->name));
 324         fmi->io = io;
 325         if (fmi->io < 0) {
 326                 v4l2_err(v4l2_dev, "No PnP card found.\n");
 327                 return fmi->io;
 328         }
 329         if (!request_region(io, 2, "radio-sf16fmi")) {
 330                 v4l2_err(v4l2_dev, "port 0x%x already in use\n", fmi->io);
 331                 pnp_device_detach(dev);
 332                 return -EBUSY;
 333         }
 334
 335         res = v4l2_device_register(NULL, v4l2_dev);
 336         if (res < 0) {
 337                 release_region(fmi->io, 2);
 338                 pnp_device_detach(dev);
 339                 v4l2_err(v4l2_dev, "Could not register v4l2_device\n");
 340                 return res;
 341         }
 342
 343         strlcpy(fmi->vdev.name, v4l2_dev->name, sizeof(fmi->vdev.name));
 344         fmi->vdev.v4l2_dev = v4l2_dev;
 345         fmi->vdev.fops = &fmi_fops;
 346         fmi->vdev.ioctl_ops = &fmi_ioctl_ops;
 347         fmi->vdev.release = video_device_release_empty;
 348         video_set_drvdata(&fmi->vdev, fmi);
 349
 350         mutex_init(&fmi->lock);
 351
 352         if (video_register_device(&fmi->vdev, VFL_TYPE_RADIO, radio_nr) < 0) {
 353                 v4l2_device_unregister(v4l2_dev);
 354                 release_region(fmi->io, 2);
 355                 pnp_device_detach(dev);
 356                 return -EINVAL;
 357         }
 358
 359         v4l2_info(v4l2_dev, "card driver at 0x%x\n", fmi->io);
 360         /* mute card - prevents noisy bootups */
 361         fmi_mute(fmi);
 362         return 0;
 363 }
 364
 365 static void __exit fmi_exit(void)
 366 {
 367         struct fmi *fmi = &fmi_card;
 368
 369         video_unregister_device(&fmi->vdev);
 370         v4l2_device_unregister(&fmi->v4l2_dev);
 371         release_region(fmi->io, 2);
 372         if (dev)
 373                 pnp_device_detach(dev);
 374 }
 375
 376 module_init(fmi_init);
 377 module_exit(fmi_exit);