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 <media/v4l2-ctrls.h>
  31 #include <media/v4l2-event.h>
  32 #include "lm7000.h"
  33
  34 MODULE_AUTHOR("Petr Vandrovec, vandrove@vc.cvut.cz and M. Kirkwood");
  35 MODULE_DESCRIPTION("A driver for the SF16-FMI, SF16-FMP and SF16-FMD radio.");
  36 MODULE_LICENSE("GPL");
  37 MODULE_VERSION("0.0.3");
  38
  39 static int io = -1;
  40 static int radio_nr = -1;
  41
  42 module_param(io, int, 0);
  43 MODULE_PARM_DESC(io, "I/O address of the SF16-FMI/SF16-FMP/SF16-FMD card (0x284 or 0x384)");
  44 module_param(radio_nr, int, 0);
  45
  46 struct fmi
  47 {
  48         struct v4l2_device v4l2_dev;
  49         struct v4l2_ctrl_handler hdl;
  50         struct video_device vdev;
  51         int io;
  52         bool mute;
  53         u32 curfreq; /* freq in kHz */
  54         struct mutex lock;
  55 };
  56
  57 static struct fmi fmi_card;
  58 static struct pnp_dev *dev;
  59 static bool pnp_attached;
  60
  61 #define RSF16_MINFREQ (87U * 16000)
  62 #define RSF16_MAXFREQ (108U * 16000)
  63
  64 #define FMI_BIT_TUN_CE          (1 << 0)
  65 #define FMI_BIT_TUN_CLK         (1 << 1)
  66 #define FMI_BIT_TUN_DATA        (1 << 2)
  67 #define FMI_BIT_VOL_SW          (1 << 3)
  68 #define FMI_BIT_TUN_STRQ        (1 << 4)
  69
  70 static void fmi_set_pins(void *handle, u8 pins)
  71 {
  72         struct fmi *fmi = handle;
  73         u8 bits = FMI_BIT_TUN_STRQ;
  74
  75         if (!fmi->mute)
  76                 bits |= FMI_BIT_VOL_SW;
  77
  78         if (pins & LM7000_DATA)
  79                 bits |= FMI_BIT_TUN_DATA;
  80         if (pins & LM7000_CLK)
  81                 bits |= FMI_BIT_TUN_CLK;
  82         if (pins & LM7000_CE)
  83                 bits |= FMI_BIT_TUN_CE;
  84
  85         mutex_lock(&fmi->lock);
  86         outb_p(bits, fmi->io);
  87         mutex_unlock(&fmi->lock);
  88 }
  89
  90 static inline void fmi_mute(struct fmi *fmi)
  91 {
  92         mutex_lock(&fmi->lock);
  93         outb(0x00, fmi->io);
  94         mutex_unlock(&fmi->lock);
  95 }
  96
  97 static inline void fmi_unmute(struct fmi *fmi)
  98 {
  99         mutex_lock(&fmi->lock);
 100         outb(0x08, fmi->io);
 101         mutex_unlock(&fmi->lock);
 102 }
 103
 104 static inline int fmi_getsigstr(struct fmi *fmi)
 105 {
 106         int val;
 107         int res;
 108
 109         mutex_lock(&fmi->lock);
 110         val = fmi->mute ? 0x00 : 0x08;  /* mute/unmute */
 111         outb(val, fmi->io);
 112         outb(val | 0x10, fmi->io);
 113         msleep(143);            /* was schedule_timeout(HZ/7) */
 114         res = (int)inb(fmi->io + 1);
 115         outb(val, fmi->io);
 116
 117         mutex_unlock(&fmi->lock);
 118         return (res & 2) ? 0 : 0xFFFF;
 119 }
 120
 121 static void fmi_set_freq(struct fmi *fmi)
 122 {
 123         fmi->curfreq = clamp(fmi->curfreq, RSF16_MINFREQ, RSF16_MAXFREQ);
 124         /* rounding in steps of 800 to match the freq
 125            that will be used */
 126         lm7000_set_freq((fmi->curfreq / 800) * 800, fmi, fmi_set_pins);
 127 }
 128
 129 static int vidioc_querycap(struct file *file, void  *priv,
 130                                         struct v4l2_capability *v)
 131 {
 132         strlcpy(v->driver, "radio-sf16fmi", sizeof(v->driver));
 133         strlcpy(v->card, "SF16-FMI/FMP/FMD radio", sizeof(v->card));
 134         strlcpy(v->bus_info, "ISA:radio-sf16fmi", sizeof(v->bus_info));
 135         v->device_caps = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
 136         v->capabilities = v->device_caps | V4L2_CAP_DEVICE_CAPS;
 137         return 0;
 138 }
 139
 140 static int vidioc_g_tuner(struct file *file, void *priv,
 141                                         struct v4l2_tuner *v)
 142 {
 143         struct fmi *fmi = video_drvdata(file);
 144
 145         if (v->index > 0)
 146                 return -EINVAL;
 147
 148         strlcpy(v->name, "FM", sizeof(v->name));
 149         v->type = V4L2_TUNER_RADIO;
 150         v->rangelow = RSF16_MINFREQ;
 151         v->rangehigh = RSF16_MAXFREQ;
 152         v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
 153         v->capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_LOW;
 154         v->audmode = V4L2_TUNER_MODE_STEREO;
 155         v->signal = fmi_getsigstr(fmi);
 156         return 0;
 157 }
 158
 159 static int vidioc_s_tuner(struct file *file, void *priv,
 160                                         const struct v4l2_tuner *v)
 161 {
 162         return v->index ? -EINVAL : 0;
 163 }
 164
 165 static int vidioc_s_frequency(struct file *file, void *priv,
 166                                         const struct v4l2_frequency *f)
 167 {
 168         struct fmi *fmi = video_drvdata(file);
 169
 170         if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
 171                 return -EINVAL;
 172
 173         fmi->curfreq = f->frequency;
 174         fmi_set_freq(fmi);
 175
 176         return 0;
 177 }
 178
 179 static int vidioc_g_frequency(struct file *file, void *priv,
 180                                         struct v4l2_frequency *f)
 181 {
 182         struct fmi *fmi = video_drvdata(file);
 183
 184         if (f->tuner != 0)
 185                 return -EINVAL;
 186         f->type = V4L2_TUNER_RADIO;
 187         f->frequency = fmi->curfreq;
 188         return 0;
 189 }
 190
 191 static int fmi_s_ctrl(struct v4l2_ctrl *ctrl)
 192 {
 193         struct fmi *fmi = container_of(ctrl->handler, struct fmi, hdl);
 194
 195         switch (ctrl->id) {
 196         case V4L2_CID_AUDIO_MUTE:
 197                 if (ctrl->val)
 198                         fmi_mute(fmi);
 199                 else
 200                         fmi_unmute(fmi);
 201                 fmi->mute = ctrl->val;
 202                 return 0;
 203         }
 204         return -EINVAL;
 205 }
 206
 207 static const struct v4l2_ctrl_ops fmi_ctrl_ops = {
 208         .s_ctrl = fmi_s_ctrl,
 209 };
 210
 211 static const struct v4l2_file_operations fmi_fops = {
 212         .owner          = THIS_MODULE,
 213         .open           = v4l2_fh_open,
 214         .release        = v4l2_fh_release,
 215         .poll           = v4l2_ctrl_poll,
 216         .unlocked_ioctl = video_ioctl2,
 217 };
 218
 219 static const struct v4l2_ioctl_ops fmi_ioctl_ops = {
 220         .vidioc_querycap    = vidioc_querycap,
 221         .vidioc_g_tuner     = vidioc_g_tuner,
 222         .vidioc_s_tuner     = vidioc_s_tuner,
 223         .vidioc_g_frequency = vidioc_g_frequency,
 224         .vidioc_s_frequency = vidioc_s_frequency,
 225         .vidioc_log_status  = v4l2_ctrl_log_status,
 226         .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
 227         .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
 228 };
 229
 230 /* ladis: this is my card. does any other types exist? */
 231 static struct isapnp_device_id id_table[] = {
 232                 /* SF16-FMI */
 233         {       ISAPNP_ANY_ID, ISAPNP_ANY_ID,
 234                 ISAPNP_VENDOR('M','F','R'), ISAPNP_FUNCTION(0xad10), 0},
 235                 /* SF16-FMD */
 236         {       ISAPNP_ANY_ID, ISAPNP_ANY_ID,
 237                 ISAPNP_VENDOR('M','F','R'), ISAPNP_FUNCTION(0xad12), 0},
 238         {       ISAPNP_CARD_END, },
 239 };
 240
 241 MODULE_DEVICE_TABLE(isapnp, id_table);
 242
 243 static int __init isapnp_fmi_probe(void)
 244 {
 245         int i = 0;
 246
 247         while (id_table[i].card_vendor != 0 && dev == NULL) {
 248                 dev = pnp_find_dev(NULL, id_table[i].vendor,
 249                                    id_table[i].function, NULL);
 250                 i++;
 251         }
 252
 253         if (!dev)
 254                 return -ENODEV;
 255         if (pnp_device_attach(dev) < 0)
 256                 return -EAGAIN;
 257         if (pnp_activate_dev(dev) < 0) {
 258                 printk(KERN_ERR "radio-sf16fmi: PnP configure failed (out of resources?)\n");
 259                 pnp_device_detach(dev);
 260                 return -ENOMEM;
 261         }
 262         if (!pnp_port_valid(dev, 0)) {
 263                 pnp_device_detach(dev);
 264                 return -ENODEV;
 265         }
 266
 267         i = pnp_port_start(dev, 0);
 268         printk(KERN_INFO "radio-sf16fmi: PnP reports card at %#x\n", i);
 269
 270         return i;
 271 }
 272
 273 static int __init fmi_init(void)
 274 {
 275         struct fmi *fmi = &fmi_card;
 276         struct v4l2_device *v4l2_dev = &fmi->v4l2_dev;
 277         struct v4l2_ctrl_handler *hdl = &fmi->hdl;
 278         int res, i;
 279         int probe_ports[] = { 0, 0x284, 0x384 };
 280
 281         if (io < 0) {
 282                 for (i = 0; i < ARRAY_SIZE(probe_ports); i++) {
 283                         io = probe_ports[i];
 284                         if (io == 0) {
 285                                 io = isapnp_fmi_probe();
 286                                 if (io < 0)
 287                                         continue;
 288                                 pnp_attached = true;
 289                         }
 290                         if (!request_region(io, 2, "radio-sf16fmi")) {
 291                                 if (pnp_attached)
 292                                         pnp_device_detach(dev);
 293                                 io = -1;
 294                                 continue;
 295                         }
 296                         if (pnp_attached ||
 297                             ((inb(io) & 0xf9) == 0xf9 && (inb(io) & 0x4) == 0))
 298                                 break;
 299                         release_region(io, 2);
 300                         io = -1;
 301                 }
 302         } else {
 303                 if (!request_region(io, 2, "radio-sf16fmi")) {
 304                         printk(KERN_ERR "radio-sf16fmi: port %#x already in use\n", io);
 305                         return -EBUSY;
 306                 }
 307                 if (inb(io) == 0xff) {
 308                         printk(KERN_ERR "radio-sf16fmi: card not present at %#x\n", io);
 309                         release_region(io, 2);
 310                         return -ENODEV;
 311                 }
 312         }
 313         if (io < 0) {
 314                 printk(KERN_ERR "radio-sf16fmi: no cards found\n");
 315                 return -ENODEV;
 316         }
 317
 318         strlcpy(v4l2_dev->name, "sf16fmi", sizeof(v4l2_dev->name));
 319         fmi->io = io;
 320
 321         res = v4l2_device_register(NULL, v4l2_dev);
 322         if (res < 0) {
 323                 release_region(fmi->io, 2);
 324                 if (pnp_attached)
 325                         pnp_device_detach(dev);
 326                 v4l2_err(v4l2_dev, "Could not register v4l2_device\n");
 327                 return res;
 328         }
 329
 330         v4l2_ctrl_handler_init(hdl, 1);
 331         v4l2_ctrl_new_std(hdl, &fmi_ctrl_ops,
 332                         V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
 333         v4l2_dev->ctrl_handler = hdl;
 334         if (hdl->error) {
 335                 res = hdl->error;
 336                 v4l2_err(v4l2_dev, "Could not register controls\n");
 337                 v4l2_ctrl_handler_free(hdl);
 338                 v4l2_device_unregister(v4l2_dev);
 339                 return res;
 340         }
 341
 342         strlcpy(fmi->vdev.name, v4l2_dev->name, sizeof(fmi->vdev.name));
 343         fmi->vdev.v4l2_dev = v4l2_dev;
 344         fmi->vdev.fops = &fmi_fops;
 345         fmi->vdev.ioctl_ops = &fmi_ioctl_ops;
 346         fmi->vdev.release = video_device_release_empty;
 347         video_set_drvdata(&fmi->vdev, fmi);
 348
 349         mutex_init(&fmi->lock);
 350
 351         /* mute card and set default frequency */
 352         fmi->mute = true;
 353         fmi->curfreq = RSF16_MINFREQ;
 354         fmi_set_freq(fmi);
 355
 356         if (video_register_device(&fmi->vdev, VFL_TYPE_RADIO, radio_nr) < 0) {
 357                 v4l2_ctrl_handler_free(hdl);
 358                 v4l2_device_unregister(v4l2_dev);
 359                 release_region(fmi->io, 2);
 360                 if (pnp_attached)
 361                         pnp_device_detach(dev);
 362                 return -EINVAL;
 363         }
 364
 365         v4l2_info(v4l2_dev, "card driver at 0x%x\n", fmi->io);
 366         return 0;
 367 }
 368
 369 static void __exit fmi_exit(void)
 370 {
 371         struct fmi *fmi = &fmi_card;
 372
 373         v4l2_ctrl_handler_free(&fmi->hdl);
 374         video_unregister_device(&fmi->vdev);
 375         v4l2_device_unregister(&fmi->v4l2_dev);
 376         release_region(fmi->io, 2);
 377         if (dev && pnp_attached)
 378                 pnp_device_detach(dev);
 379 }
 380
 381 module_init(fmi_init);
 382 module_exit(fmi_exit);