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 <linux/videodev2.h> /* kernel radio structs */
37 #include <linux/mutex.h>
38 #include <linux/version.h> /* for KERNEL_VERSION MACRO */
39 #include <linux/io.h> /* outb, outb_p */
40 #include <media/v4l2-device.h>
41 #include <media/v4l2-ioctl.h>
43 MODULE_AUTHOR("C.van Schaik");
44 MODULE_DESCRIPTION("A driver for the Zoltrix Radio Plus.");
45 MODULE_LICENSE("GPL");
47 #ifndef CONFIG_RADIO_ZOLTRIX_PORT
48 #define CONFIG_RADIO_ZOLTRIX_PORT -1
51 static int io = CONFIG_RADIO_ZOLTRIX_PORT;
52 static int radio_nr = -1;
54 module_param(io, int, 0);
55 MODULE_PARM_DESC(io, "I/O address of the Zoltrix Radio Plus (0x20c or 0x30c)");
56 module_param(radio_nr, int, 0);
58 #define RADIO_VERSION KERNEL_VERSION(0, 0, 2)
61 struct v4l2_device v4l2_dev;
62 struct video_device vdev;
65 unsigned long curfreq;
71 static struct zoltrix zoltrix_card;
73 static int zol_setvol(struct zoltrix *zol, int vol)
79 mutex_lock(&zol->lock);
83 inb(zol->io + 3); /* Zoltrix needs to be read to confirm */
84 mutex_unlock(&zol->lock);
88 outb(zol->curvol-1, zol->io);
91 mutex_unlock(&zol->lock);
95 static void zol_mute(struct zoltrix *zol)
98 mutex_lock(&zol->lock);
101 inb(zol->io + 3); /* Zoltrix needs to be read to confirm */
102 mutex_unlock(&zol->lock);
105 static void zol_unmute(struct zoltrix *zol)
108 zol_setvol(zol, zol->curvol);
111 static int zol_setfreq(struct zoltrix *zol, unsigned long freq)
113 /* tunes the radio to the desired frequency */
114 struct v4l2_device *v4l2_dev = &zol->v4l2_dev;
115 unsigned long long bitmask, f, m;
116 unsigned int stereo = zol->stereo;
120 v4l2_warn(v4l2_dev, "cannot set a frequency of 0.\n");
124 m = (freq / 160 - 8800) * 2;
125 f = (unsigned long long)m + 0x4d1c;
127 bitmask = 0xc480402c10080000ull;
130 mutex_lock(&zol->lock);
136 inb(zol->io + 3); /* Zoltrix needs to be read to confirm */
141 bitmask = (bitmask ^ ((f & 0xff) << 47) ^ ((f & 0xff00) << 30) ^ (stereo << 31));
143 if ((bitmask & 0x8000000000000000ull) != 0) {
160 /* termination sequence */
176 mutex_unlock(&zol->lock);
179 zol_setvol(zol, zol->curvol);
183 /* Get signal strength */
184 static int zol_getsigstr(struct zoltrix *zol)
188 mutex_lock(&zol->lock);
189 outb(0x00, zol->io); /* This stuff I found to do nothing */
190 outb(zol->curvol, zol->io);
197 mutex_unlock(&zol->lock);
202 /* I found this out by playing with a binary scanner on the card io */
203 return a == 0xcf || a == 0xdf || a == 0xef;
206 static int zol_is_stereo(struct zoltrix *zol)
210 mutex_lock(&zol->lock);
213 outb(zol->curvol, zol->io);
220 mutex_unlock(&zol->lock);
222 return x1 == x2 && x1 == 0xcf;
225 static int vidioc_querycap(struct file *file, void *priv,
226 struct v4l2_capability *v)
228 strlcpy(v->driver, "radio-zoltrix", sizeof(v->driver));
229 strlcpy(v->card, "Zoltrix Radio", sizeof(v->card));
230 strlcpy(v->bus_info, "ISA", sizeof(v->bus_info));
231 v->version = RADIO_VERSION;
232 v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO;
236 static int vidioc_g_tuner(struct file *file, void *priv,
237 struct v4l2_tuner *v)
239 struct zoltrix *zol = video_drvdata(file);
244 strlcpy(v->name, "FM", sizeof(v->name));
245 v->type = V4L2_TUNER_RADIO;
246 v->rangelow = 88 * 16000;
247 v->rangehigh = 108 * 16000;
248 v->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
249 v->capability = V4L2_TUNER_CAP_LOW;
250 if (zol_is_stereo(zol))
251 v->audmode = V4L2_TUNER_MODE_STEREO;
253 v->audmode = V4L2_TUNER_MODE_MONO;
254 v->signal = 0xFFFF * zol_getsigstr(zol);
258 static int vidioc_s_tuner(struct file *file, void *priv,
259 struct v4l2_tuner *v)
261 return v->index ? -EINVAL : 0;
264 static int vidioc_s_frequency(struct file *file, void *priv,
265 struct v4l2_frequency *f)
267 struct zoltrix *zol = video_drvdata(file);
269 if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
271 if (zol_setfreq(zol, f->frequency) != 0)
276 static int vidioc_g_frequency(struct file *file, void *priv,
277 struct v4l2_frequency *f)
279 struct zoltrix *zol = video_drvdata(file);
283 f->type = V4L2_TUNER_RADIO;
284 f->frequency = zol->curfreq;
288 static int vidioc_queryctrl(struct file *file, void *priv,
289 struct v4l2_queryctrl *qc)
292 case V4L2_CID_AUDIO_MUTE:
293 return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
294 case V4L2_CID_AUDIO_VOLUME:
295 return v4l2_ctrl_query_fill(qc, 0, 65535, 4096, 65535);
300 static int vidioc_g_ctrl(struct file *file, void *priv,
301 struct v4l2_control *ctrl)
303 struct zoltrix *zol = video_drvdata(file);
306 case V4L2_CID_AUDIO_MUTE:
307 ctrl->value = zol->muted;
309 case V4L2_CID_AUDIO_VOLUME:
310 ctrl->value = zol->curvol * 4096;
316 static int vidioc_s_ctrl(struct file *file, void *priv,
317 struct v4l2_control *ctrl)
319 struct zoltrix *zol = video_drvdata(file);
322 case V4L2_CID_AUDIO_MUTE:
327 zol_setvol(zol, zol->curvol);
330 case V4L2_CID_AUDIO_VOLUME:
331 zol_setvol(zol, ctrl->value / 4096);
335 if (zol_setfreq(zol, zol->curfreq) != 0)
338 /* FIXME: Implement stereo/mono switch on V4L2 */
339 if (v->mode & VIDEO_SOUND_STEREO) {
341 zol_setfreq(zol, zol->curfreq);
343 if (v->mode & VIDEO_SOUND_MONO) {
345 zol_setfreq(zol, zol->curfreq);
351 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
357 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
359 return i ? -EINVAL : 0;
362 static int vidioc_g_audio(struct file *file, void *priv,
363 struct v4l2_audio *a)
366 strlcpy(a->name, "Radio", sizeof(a->name));
367 a->capability = V4L2_AUDCAP_STEREO;
371 static int vidioc_s_audio(struct file *file, void *priv,
372 struct v4l2_audio *a)
374 return a->index ? -EINVAL : 0;
377 static const struct v4l2_file_operations zoltrix_fops =
379 .owner = THIS_MODULE,
380 .ioctl = video_ioctl2,
383 static const struct v4l2_ioctl_ops zoltrix_ioctl_ops = {
384 .vidioc_querycap = vidioc_querycap,
385 .vidioc_g_tuner = vidioc_g_tuner,
386 .vidioc_s_tuner = vidioc_s_tuner,
387 .vidioc_g_audio = vidioc_g_audio,
388 .vidioc_s_audio = vidioc_s_audio,
389 .vidioc_g_input = vidioc_g_input,
390 .vidioc_s_input = vidioc_s_input,
391 .vidioc_g_frequency = vidioc_g_frequency,
392 .vidioc_s_frequency = vidioc_s_frequency,
393 .vidioc_queryctrl = vidioc_queryctrl,
394 .vidioc_g_ctrl = vidioc_g_ctrl,
395 .vidioc_s_ctrl = vidioc_s_ctrl,
398 static int __init zoltrix_init(void)
400 struct zoltrix *zol = &zoltrix_card;
401 struct v4l2_device *v4l2_dev = &zol->v4l2_dev;
404 strlcpy(v4l2_dev->name, "zoltrix", sizeof(v4l2_dev->name));
407 v4l2_err(v4l2_dev, "You must set an I/O address with io=0x20c or 0x30c\n");
410 if (zol->io != 0x20c && zol->io != 0x30c) {
411 v4l2_err(v4l2_dev, "invalid port, try 0x20c or 0x30c\n");
415 if (!request_region(zol->io, 2, "zoltrix")) {
416 v4l2_err(v4l2_dev, "port 0x%x already in use\n", zol->io);
420 res = v4l2_device_register(NULL, v4l2_dev);
422 release_region(zol->io, 2);
423 v4l2_err(v4l2_dev, "Could not register v4l2_device\n");
427 strlcpy(zol->vdev.name, v4l2_dev->name, sizeof(zol->vdev.name));
428 zol->vdev.v4l2_dev = v4l2_dev;
429 zol->vdev.fops = &zoltrix_fops;
430 zol->vdev.ioctl_ops = &zoltrix_ioctl_ops;
431 zol->vdev.release = video_device_release_empty;
432 video_set_drvdata(&zol->vdev, zol);
434 if (video_register_device(&zol->vdev, VFL_TYPE_RADIO, radio_nr) < 0) {
435 v4l2_device_unregister(v4l2_dev);
436 release_region(zol->io, 2);
439 v4l2_info(v4l2_dev, "Zoltrix Radio Plus card driver.\n");
441 mutex_init(&zol->lock);
443 /* mute card - prevents noisy bootups */
445 /* this ensures that the volume is all the way down */
458 static void __exit zoltrix_exit(void)
460 struct zoltrix *zol = &zoltrix_card;
462 video_unregister_device(&zol->vdev);
463 v4l2_device_unregister(&zol->v4l2_dev);
464 release_region(zol->io, 2);
467 module_init(zoltrix_init);
468 module_exit(zoltrix_exit);