drivers/media/radio/radio-sf16fmi.c

   1 /* SF16-FMI, SF16-FMP and SF16-FMD 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 SF16-FMI/SF16-FMP/SF16-FMD
  15  *
  16  * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
  17  */
  18
  19 #include <linux/kernel.h>       /* __setup                      */
  20 #include <linux/module.h>       /* Modules                      */
  21 #include <linux/init.h>         /* Initdata                     */
  22 #include <linux/ioport.h>       /* request_region               */
  23 #include <linux/delay.h>        /* udelay                       */
  24 #include <linux/isapnp.h>
  25 #include <linux/mutex.h>
  26 #include <linux/videodev2.h>    /* kernel radio structs         */
  27 #include <linux/io.h>           /* outb, outb_p                 */
  28 #include <media/v4l2-device.h>
  29 #include <media/v4l2-ioctl.h>
  30 #include "lm7000.h"
  31
  32 MODULE_AUTHOR("Petr Vandrovec, vandrove@vc.cvut.cz and M. Kirkwood");
  33 MODULE_DESCRIPTION("A driver for the SF16-FMI, SF16-FMP and SF16-FMD radio.");
  34 MODULE_LICENSE("GPL");
  35 MODULE_VERSION("0.0.3");
  36
  37 static int io = -1;
  38 static int radio_nr = -1;
  39
  40 module_param(io, int, 0);
  41 MODULE_PARM_DESC(io, "I/O address of the SF16-FMI/SF16-FMP/SF16-FMD card (0x284 or 0x384)");
  42 module_param(radio_nr, int, 0);
  43
  44 struct fmi
  45 {
  46         struct v4l2_device v4l2_dev;
  47         struct video_device vdev;
  48         int io;
  49         bool mute;
  50         unsigned long curfreq; /* freq in kHz */
  51         struct mutex lock;
  52 };
  53
  54 static struct fmi fmi_card;
  55 static struct pnp_dev *dev;
  56 bool pnp_attached;
  57
  58 #define RSF16_MINFREQ (87 * 16000)
  59 #define RSF16_MAXFREQ (108 * 16000)
  60
  61 #define FMI_BIT_TUN_CE          (1 << 0)
  62 #define FMI_BIT_TUN_CLK         (1 << 1)
  63 #define FMI_BIT_TUN_DATA        (1 << 2)
  64 #define FMI_BIT_VOL_SW          (1 << 3)
  65 #define FMI_BIT_TUN_STRQ        (1 << 4)
  66
  67 static void fmi_set_pins(void *handle, u8 pins)
  68 {
  69         struct fmi *fmi = handle;
  70         u8 bits = FMI_BIT_TUN_STRQ;
  71
  72         if (!fmi->mute)
  73                 bits |= FMI_BIT_VOL_SW;
  74
  75         if (pins & LM7000_DATA)
  76                 bits |= FMI_BIT_TUN_DATA;
  77         if (pins & LM7000_CLK)
  78                 bits |= FMI_BIT_TUN_CLK;
  79         if (pins & LM7000_CE)
  80                 bits |= FMI_BIT_TUN_CE;
  81
  82         mutex_lock(&fmi->lock);
  83         outb_p(bits, fmi->io);
  84         mutex_unlock(&fmi->lock);
  85 }
  86
  87 static inline void fmi_mute(struct fmi *fmi)
  88 {
  89         mutex_lock(&fmi->lock);
  90         outb(0x00, fmi->io);
  91         mutex_unlock(&fmi->lock);
  92 }
  93
  94 static inline void fmi_unmute(struct fmi *fmi)
  95 {
  96         mutex_lock(&fmi->lock);
  97         outb(0x08, fmi->io);
  98         mutex_unlock(&fmi->lock);
  99 }
 100
 101 static inline int fmi_getsigstr(struct fmi *fmi)
 102 {
 103         int val;
 104         int res;
 105
 106         mutex_lock(&fmi->lock);
 107         val = fmi->mute ? 0x00 : 0x08;  /* mute/unmute */
 108         outb(val, fmi->io);
 109         outb(val | 0x10, fmi->io);
 110         msleep(143);            /* was schedule_timeout(HZ/7) */
 111         res = (int)inb(fmi->io + 1);
 112         outb(val, fmi->io);
 113
 114         mutex_unlock(&fmi->lock);
 115         return (res & 2) ? 0 : 0xFFFF;
 116 }
 117
 118 static int vidioc_querycap(struct file *file, void  *priv,
 119                                         struct v4l2_capability *v)
 120 {
 121         strlcpy(v->driver, "radio-sf16fmi", sizeof(v->driver));
 122         strlcpy(v->card, "SF16-FMI/FMP/FMD radio", sizeof(v->card));
 123         strlcpy(v->bus_info, "ISA", sizeof(v->bus_info));
 124         v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
 125         return 0;
 126 }
 127
 128 static int vidioc_g_tuner(struct file *file, void *priv,
 129                                         struct v4l2_tuner *v)
 130 {
 131         struct fmi *fmi = video_drvdata(file);
 132
 133         if (v->index > 0)
 134                 return -EINVAL;
 135
 136         strlcpy(v->name, "FM", sizeof(v->name));
 137         v->type = V4L2_TUNER_RADIO;
 138         v->rangelow = RSF16_MINFREQ;
 139         v->rangehigh = RSF16_MAXFREQ;
 140         v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
 141         v->capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_LOW;
 142         v->audmode = V4L2_TUNER_MODE_STEREO;
 143         v->signal = fmi_getsigstr(fmi);
 144         return 0;
 145 }
 146
 147 static int vidioc_s_tuner(struct file *file, void *priv,
 148                                         struct v4l2_tuner *v)
 149 {
 150         return v->index ? -EINVAL : 0;
 151 }
 152
 153 static int vidioc_s_frequency(struct file *file, void *priv,
 154                                         struct v4l2_frequency *f)
 155 {
 156         struct fmi *fmi = video_drvdata(file);
 157
 158         if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
 159                 return -EINVAL;
 160         if (f->frequency < RSF16_MINFREQ ||
 161                         f->frequency > RSF16_MAXFREQ)
 162                 return -EINVAL;
 163         /* rounding in steps of 800 to match the freq
 164            that will be used */
 165         lm7000_set_freq((f->frequency / 800) * 800, fmi, fmi_set_pins);
 166         return 0;
 167 }
 168
 169 static int vidioc_g_frequency(struct file *file, void *priv,
 170                                         struct v4l2_frequency *f)
 171 {
 172         struct fmi *fmi = video_drvdata(file);
 173
 174         if (f->tuner != 0)
 175                 return -EINVAL;
 176         f->type = V4L2_TUNER_RADIO;
 177         f->frequency = fmi->curfreq;
 178         return 0;
 179 }
 180
 181 static int vidioc_queryctrl(struct file *file, void *priv,
 182                                         struct v4l2_queryctrl *qc)
 183 {
 184         switch (qc->id) {
 185         case V4L2_CID_AUDIO_MUTE:
 186                 return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
 187         }
 188         return -EINVAL;
 189 }
 190
 191 static int vidioc_g_ctrl(struct file *file, void *priv,
 192                                         struct v4l2_control *ctrl)
 193 {
 194         struct fmi *fmi = video_drvdata(file);
 195
 196         switch (ctrl->id) {
 197         case V4L2_CID_AUDIO_MUTE:
 198                 ctrl->value = fmi->mute;
 199                 return 0;
 200         }
 201         return -EINVAL;
 202 }
 203
 204 static int vidioc_s_ctrl(struct file *file, void *priv,
 205                                         struct v4l2_control *ctrl)
 206 {
 207         struct fmi *fmi = video_drvdata(file);
 208
 209         switch (ctrl->id) {
 210         case V4L2_CID_AUDIO_MUTE:
 211                 if (ctrl->value)
 212                         fmi_mute(fmi);
 213                 else
 214                         fmi_unmute(fmi);
 215                 fmi->mute = ctrl->value;
 216                 return 0;
 217         }
 218         return -EINVAL;
 219 }
 220
 221 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
 222 {
 223         *i = 0;
 224         return 0;
 225 }
 226
 227 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
 228 {
 229         return i ? -EINVAL : 0;
 230 }
 231
 232 static int vidioc_g_audio(struct file *file, void *priv,
 233                                         struct v4l2_audio *a)
 234 {
 235         a->index = 0;
 236         strlcpy(a->name, "Radio", sizeof(a->name));
 237         a->capability = V4L2_AUDCAP_STEREO;
 238         return 0;
 239 }
 240
 241 static int vidioc_s_audio(struct file *file, void *priv,
 242                                         const struct v4l2_audio *a)
 243 {
 244         return a->index ? -EINVAL : 0;
 245 }
 246
 247 static const struct v4l2_file_operations fmi_fops = {
 248         .owner          = THIS_MODULE,
 249         .unlocked_ioctl = video_ioctl2,
 250 };
 251
 252 static const struct v4l2_ioctl_ops fmi_ioctl_ops = {
 253         .vidioc_querycap    = vidioc_querycap,
 254         .vidioc_g_tuner     = vidioc_g_tuner,
 255         .vidioc_s_tuner     = vidioc_s_tuner,
 256         .vidioc_g_audio     = vidioc_g_audio,
 257         .vidioc_s_audio     = vidioc_s_audio,
 258         .vidioc_g_input     = vidioc_g_input,
 259         .vidioc_s_input     = vidioc_s_input,
 260         .vidioc_g_frequency = vidioc_g_frequency,
 261         .vidioc_s_frequency = vidioc_s_frequency,
 262         .vidioc_queryctrl   = vidioc_queryctrl,
 263         .vidioc_g_ctrl      = vidioc_g_ctrl,
 264         .vidioc_s_ctrl      = vidioc_s_ctrl,
 265 };
 266
 267 /* ladis: this is my card. does any other types exist? */
 268 static struct isapnp_device_id id_table[] = {
 269                 /* SF16-FMI */
 270         {       ISAPNP_ANY_ID, ISAPNP_ANY_ID,
 271                 ISAPNP_VENDOR('M','F','R'), ISAPNP_FUNCTION(0xad10), 0},
 272                 /* SF16-FMD */
 273         {       ISAPNP_ANY_ID, ISAPNP_ANY_ID,
 274                 ISAPNP_VENDOR('M','F','R'), ISAPNP_FUNCTION(0xad12), 0},
 275         {       ISAPNP_CARD_END, },
 276 };
 277
 278 MODULE_DEVICE_TABLE(isapnp, id_table);
 279
 280 static int __init isapnp_fmi_probe(void)
 281 {
 282         int i = 0;
 283
 284         while (id_table[i].card_vendor != 0 && dev == NULL) {
 285                 dev = pnp_find_dev(NULL, id_table[i].vendor,
 286                                    id_table[i].function, NULL);
 287                 i++;
 288         }
 289
 290         if (!dev)
 291                 return -ENODEV;
 292         if (pnp_device_attach(dev) < 0)
 293                 return -EAGAIN;
 294         if (pnp_activate_dev(dev) < 0) {
 295                 printk(KERN_ERR "radio-sf16fmi: PnP configure failed (out of resources?)\n");
 296                 pnp_device_detach(dev);
 297                 return -ENOMEM;
 298         }
 299         if (!pnp_port_valid(dev, 0)) {
 300                 pnp_device_detach(dev);
 301                 return -ENODEV;
 302         }
 303
 304         i = pnp_port_start(dev, 0);
 305         printk(KERN_INFO "radio-sf16fmi: PnP reports card at %#x\n", i);
 306
 307         return i;
 308 }
 309
 310 static int __init fmi_init(void)
 311 {
 312         struct fmi *fmi = &fmi_card;
 313         struct v4l2_device *v4l2_dev = &fmi->v4l2_dev;
 314         int res, i;
 315         int probe_ports[] = { 0, 0x284, 0x384 };
 316
 317         if (io < 0) {
 318                 for (i = 0; i < ARRAY_SIZE(probe_ports); i++) {
 319                         io = probe_ports[i];
 320                         if (io == 0) {
 321                                 io = isapnp_fmi_probe();
 322                                 if (io < 0)
 323                                         continue;
 324                                 pnp_attached = 1;
 325                         }
 326                         if (!request_region(io, 2, "radio-sf16fmi")) {
 327                                 if (pnp_attached)
 328                                         pnp_device_detach(dev);
 329                                 io = -1;
 330                                 continue;
 331                         }
 332                         if (pnp_attached ||
 333                             ((inb(io) & 0xf9) == 0xf9 && (inb(io) & 0x4) == 0))
 334                                 break;
 335                         release_region(io, 2);
 336                         io = -1;
 337                 }
 338         } else {
 339                 if (!request_region(io, 2, "radio-sf16fmi")) {
 340                         printk(KERN_ERR "radio-sf16fmi: port %#x already in use\n", io);
 341                         return -EBUSY;
 342                 }
 343                 if (inb(io) == 0xff) {
 344                         printk(KERN_ERR "radio-sf16fmi: card not present at %#x\n", io);
 345                         release_region(io, 2);
 346                         return -ENODEV;
 347                 }
 348         }
 349         if (io < 0) {
 350                 printk(KERN_ERR "radio-sf16fmi: no cards found\n");
 351                 return -ENODEV;
 352         }
 353
 354         strlcpy(v4l2_dev->name, "sf16fmi", sizeof(v4l2_dev->name));
 355         fmi->io = io;
 356
 357         res = v4l2_device_register(NULL, v4l2_dev);
 358         if (res < 0) {
 359                 release_region(fmi->io, 2);
 360                 if (pnp_attached)
 361                         pnp_device_detach(dev);
 362                 v4l2_err(v4l2_dev, "Could not register v4l2_device\n");
 363                 return res;
 364         }
 365
 366         strlcpy(fmi->vdev.name, v4l2_dev->name, sizeof(fmi->vdev.name));
 367         fmi->vdev.v4l2_dev = v4l2_dev;
 368         fmi->vdev.fops = &fmi_fops;
 369         fmi->vdev.ioctl_ops = &fmi_ioctl_ops;
 370         fmi->vdev.release = video_device_release_empty;
 371         video_set_drvdata(&fmi->vdev, fmi);
 372
 373         mutex_init(&fmi->lock);
 374
 375         /* mute card - prevents noisy bootups */
 376         fmi_mute(fmi);
 377
 378         if (video_register_device(&fmi->vdev, VFL_TYPE_RADIO, radio_nr) < 0) {
 379                 v4l2_device_unregister(v4l2_dev);
 380                 release_region(fmi->io, 2);
 381                 if (pnp_attached)
 382                         pnp_device_detach(dev);
 383                 return -EINVAL;
 384         }
 385
 386         v4l2_info(v4l2_dev, "card driver at 0x%x\n", fmi->io);
 387         return 0;
 388 }
 389
 390 static void __exit fmi_exit(void)
 391 {
 392         struct fmi *fmi = &fmi_card;
 393
 394         video_unregister_device(&fmi->vdev);
 395         v4l2_device_unregister(&fmi->v4l2_dev);
 396         release_region(fmi->io, 2);
 397         if (dev && pnp_attached)
 398                 pnp_device_detach(dev);
 399 }
 400
 401 module_init(fmi_init);
 402 module_exit(fmi_exit);