1 /* zoltrix radio plus driver for Linux radio support
2 * (c) 1998 C. van Schaik <carl@leg.uct.ac.za>
5 * Due to the inconsistency in reading from the signal flags
6 * it is difficult to get an accurate tuned signal.
8 * It seems that the card is not linear to 0 volume. It cuts off
9 * at a low volume, and it is not possible (at least I have not found)
10 * to get fine volume control over the low volume range.
12 * Some code derived from code by Romolo Manfredini
15 * 1999-05-06 - (C. van Schaik)
16 * - Make signal strength and stereo scans
17 * kinder to cpu while in delay
18 * 1999-01-05 - (C. van Schaik)
19 * - Changed tuning to 1/160Mhz accuracy
20 * - Added stereo support
21 * (card defaults to stereo)
22 * (can explicitly force mono on the card)
23 * (can detect if station is in stereo)
24 * - Added unmute function
25 * - Reworked ioctl functions
26 * 2002-07-15 - Fix Stereo typo
28 * 2006-07-24 - Converted to V4L2 API
29 * by Mauro Carvalho Chehab <mchehab@infradead.org>
32 #include <linux/module.h> /* Modules */
33 #include <linux/init.h> /* Initdata */
34 #include <linux/ioport.h> /* request_region */
35 #include <linux/delay.h> /* udelay, msleep */
36 #include <asm/io.h> /* outb, outb_p */
37 #include <asm/uaccess.h> /* copy to/from user */
38 #include <linux/videodev2.h> /* kernel radio structs */
39 #include <media/v4l2-common.h>
40 #include <media/v4l2-ioctl.h>
42 #include <linux/version.h> /* for KERNEL_VERSION MACRO */
43 #define RADIO_VERSION KERNEL_VERSION(0,0,2)
45 static struct v4l2_queryctrl radio_qctrl[] = {
47 .id = V4L2_CID_AUDIO_MUTE,
52 .type = V4L2_CTRL_TYPE_BOOLEAN,
54 .id = V4L2_CID_AUDIO_VOLUME,
59 .default_value = 0xff,
60 .type = V4L2_CTRL_TYPE_INTEGER,
64 #ifndef CONFIG_RADIO_ZOLTRIX_PORT
65 #define CONFIG_RADIO_ZOLTRIX_PORT -1
68 static int io = CONFIG_RADIO_ZOLTRIX_PORT;
69 static int radio_nr = -1;
74 unsigned long curfreq;
80 static int zol_setvol(struct zol_device *dev, int vol)
86 mutex_lock(&dev->lock);
90 inb(io + 3); /* Zoltrix needs to be read to confirm */
91 mutex_unlock(&dev->lock);
95 outb(dev->curvol-1, io);
98 mutex_unlock(&dev->lock);
102 static void zol_mute(struct zol_device *dev)
105 mutex_lock(&dev->lock);
108 inb(io + 3); /* Zoltrix needs to be read to confirm */
109 mutex_unlock(&dev->lock);
112 static void zol_unmute(struct zol_device *dev)
115 zol_setvol(dev, dev->curvol);
118 static int zol_setfreq(struct zol_device *dev, unsigned long freq)
120 /* tunes the radio to the desired frequency */
121 unsigned long long bitmask, f, m;
122 unsigned int stereo = dev->stereo;
127 m = (freq / 160 - 8800) * 2;
128 f = (unsigned long long) m + 0x4d1c;
130 bitmask = 0xc480402c10080000ull;
133 mutex_lock(&dev->lock);
137 inb(io + 3); /* Zoltrix needs to be read to confirm */
142 bitmask = (bitmask ^ ((f & 0xff) << 47) ^ ((f & 0xff00) << 30) ^ ( stereo << 31));
144 if ((bitmask & 0x8000000000000000ull) != 0) {
161 /* termination sequence */
178 mutex_unlock(&dev->lock);
182 zol_setvol(dev, dev->curvol);
187 /* Get signal strength */
189 static int zol_getsigstr(struct zol_device *dev)
193 mutex_lock(&dev->lock);
194 outb(0x00, io); /* This stuff I found to do nothing */
195 outb(dev->curvol, io);
202 mutex_unlock(&dev->lock);
207 if ((a == 0xcf) || (a == 0xdf) /* I found this out by playing */
208 || (a == 0xef)) /* with a binary scanner on the card io */
213 static int zol_is_stereo (struct zol_device *dev)
217 mutex_lock(&dev->lock);
220 outb(dev->curvol, io);
227 mutex_unlock(&dev->lock);
229 if ((x1 == x2) && (x1 == 0xcf))
234 static int vidioc_querycap(struct file *file, void *priv,
235 struct v4l2_capability *v)
237 strlcpy(v->driver, "radio-zoltrix", sizeof(v->driver));
238 strlcpy(v->card, "Zoltrix Radio", sizeof(v->card));
239 sprintf(v->bus_info, "ISA");
240 v->version = RADIO_VERSION;
241 v->capabilities = V4L2_CAP_TUNER;
245 static int vidioc_g_tuner(struct file *file, void *priv,
246 struct v4l2_tuner *v)
248 struct video_device *dev = video_devdata(file);
249 struct zol_device *zol = dev->priv;
254 strcpy(v->name, "FM");
255 v->type = V4L2_TUNER_RADIO;
256 v->rangelow = (88*16000);
257 v->rangehigh = (108*16000);
258 v->rxsubchans = V4L2_TUNER_SUB_MONO|V4L2_TUNER_SUB_STEREO;
259 v->capability = V4L2_TUNER_CAP_LOW;
260 if (zol_is_stereo(zol))
261 v->audmode = V4L2_TUNER_MODE_STEREO;
263 v->audmode = V4L2_TUNER_MODE_MONO;
264 v->signal = 0xFFFF*zol_getsigstr(zol);
268 static int vidioc_s_tuner(struct file *file, void *priv,
269 struct v4l2_tuner *v)
276 static int vidioc_s_frequency(struct file *file, void *priv,
277 struct v4l2_frequency *f)
279 struct video_device *dev = video_devdata(file);
280 struct zol_device *zol = dev->priv;
282 zol->curfreq = f->frequency;
283 zol_setfreq(zol, zol->curfreq);
287 static int vidioc_g_frequency(struct file *file, void *priv,
288 struct v4l2_frequency *f)
290 struct video_device *dev = video_devdata(file);
291 struct zol_device *zol = dev->priv;
293 f->type = V4L2_TUNER_RADIO;
294 f->frequency = zol->curfreq;
298 static int vidioc_queryctrl(struct file *file, void *priv,
299 struct v4l2_queryctrl *qc)
303 for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
304 if (qc->id && qc->id == radio_qctrl[i].id) {
305 memcpy(qc, &(radio_qctrl[i]),
313 static int vidioc_g_ctrl(struct file *file, void *priv,
314 struct v4l2_control *ctrl)
316 struct video_device *dev = video_devdata(file);
317 struct zol_device *zol = dev->priv;
320 case V4L2_CID_AUDIO_MUTE:
321 ctrl->value = zol->muted;
323 case V4L2_CID_AUDIO_VOLUME:
324 ctrl->value = zol->curvol * 4096;
330 static int vidioc_s_ctrl(struct file *file, void *priv,
331 struct v4l2_control *ctrl)
333 struct video_device *dev = video_devdata(file);
334 struct zol_device *zol = dev->priv;
337 case V4L2_CID_AUDIO_MUTE:
342 zol_setvol(zol,zol->curvol);
345 case V4L2_CID_AUDIO_VOLUME:
346 zol_setvol(zol,ctrl->value/4096);
350 zol_setfreq(zol, zol->curfreq);
352 /* FIXME: Implement stereo/mono switch on V4L2 */
353 if (v->mode & VIDEO_SOUND_STEREO) {
355 zol_setfreq(zol, zol->curfreq);
357 if (v->mode & VIDEO_SOUND_MONO) {
359 zol_setfreq(zol, zol->curfreq);
365 static int vidioc_g_audio(struct file *file, void *priv,
366 struct v4l2_audio *a)
371 strcpy(a->name, "Radio");
372 a->capability = V4L2_AUDCAP_STEREO;
376 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
382 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
389 static int vidioc_s_audio(struct file *file, void *priv,
390 struct v4l2_audio *a)
397 static struct zol_device zoltrix_unit;
399 static const struct file_operations zoltrix_fops =
401 .owner = THIS_MODULE,
402 .open = video_exclusive_open,
403 .release = video_exclusive_release,
404 .ioctl = video_ioctl2,
406 .compat_ioctl = v4l_compat_ioctl32,
411 static const struct v4l2_ioctl_ops zoltrix_ioctl_ops = {
412 .vidioc_querycap = vidioc_querycap,
413 .vidioc_g_tuner = vidioc_g_tuner,
414 .vidioc_s_tuner = vidioc_s_tuner,
415 .vidioc_g_audio = vidioc_g_audio,
416 .vidioc_s_audio = vidioc_s_audio,
417 .vidioc_g_input = vidioc_g_input,
418 .vidioc_s_input = vidioc_s_input,
419 .vidioc_g_frequency = vidioc_g_frequency,
420 .vidioc_s_frequency = vidioc_s_frequency,
421 .vidioc_queryctrl = vidioc_queryctrl,
422 .vidioc_g_ctrl = vidioc_g_ctrl,
423 .vidioc_s_ctrl = vidioc_s_ctrl,
426 static struct video_device zoltrix_radio = {
427 .name = "Zoltrix Radio Plus",
428 .fops = &zoltrix_fops,
429 .ioctl_ops = &zoltrix_ioctl_ops,
432 static int __init zoltrix_init(void)
435 printk(KERN_ERR "You must set an I/O address with io=0x???\n");
438 if ((io != 0x20c) && (io != 0x30c)) {
439 printk(KERN_ERR "zoltrix: invalid port, try 0x20c or 0x30c\n");
443 zoltrix_radio.priv = &zoltrix_unit;
444 if (!request_region(io, 2, "zoltrix")) {
445 printk(KERN_ERR "zoltrix: port 0x%x already in use\n", io);
449 if (video_register_device(&zoltrix_radio, VFL_TYPE_RADIO, radio_nr) == -1)
451 release_region(io, 2);
454 printk(KERN_INFO "Zoltrix Radio Plus card driver.\n");
456 mutex_init(&zoltrix_unit.lock);
458 /* mute card - prevents noisy bootups */
460 /* this ensures that the volume is all the way down */
467 zoltrix_unit.curvol = 0;
468 zoltrix_unit.stereo = 1;
473 MODULE_AUTHOR("C.van Schaik");
474 MODULE_DESCRIPTION("A driver for the Zoltrix Radio Plus.");
475 MODULE_LICENSE("GPL");
477 module_param(io, int, 0);
478 MODULE_PARM_DESC(io, "I/O address of the Zoltrix Radio Plus (0x20c or 0x30c)");
479 module_param(radio_nr, int, 0);
481 static void __exit zoltrix_cleanup_module(void)
483 video_unregister_device(&zoltrix_radio);
484 release_region(io, 2);
487 module_init(zoltrix_init);
488 module_exit(zoltrix_cleanup_module);