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;
75 unsigned long curfreq;
81 static int zol_setvol(struct zol_device *dev, int vol)
87 mutex_lock(&dev->lock);
91 inb(io + 3); /* Zoltrix needs to be read to confirm */
92 mutex_unlock(&dev->lock);
96 outb(dev->curvol-1, io);
99 mutex_unlock(&dev->lock);
103 static void zol_mute(struct zol_device *dev)
106 mutex_lock(&dev->lock);
109 inb(io + 3); /* Zoltrix needs to be read to confirm */
110 mutex_unlock(&dev->lock);
113 static void zol_unmute(struct zol_device *dev)
116 zol_setvol(dev, dev->curvol);
119 static int zol_setfreq(struct zol_device *dev, unsigned long freq)
121 /* tunes the radio to the desired frequency */
122 unsigned long long bitmask, f, m;
123 unsigned int stereo = dev->stereo;
128 m = (freq / 160 - 8800) * 2;
129 f = (unsigned long long) m + 0x4d1c;
131 bitmask = 0xc480402c10080000ull;
134 mutex_lock(&dev->lock);
138 inb(io + 3); /* Zoltrix needs to be read to confirm */
143 bitmask = (bitmask ^ ((f & 0xff) << 47) ^ ((f & 0xff00) << 30) ^ ( stereo << 31));
145 if ((bitmask & 0x8000000000000000ull) != 0) {
162 /* termination sequence */
179 mutex_unlock(&dev->lock);
183 zol_setvol(dev, dev->curvol);
188 /* Get signal strength */
190 static int zol_getsigstr(struct zol_device *dev)
194 mutex_lock(&dev->lock);
195 outb(0x00, io); /* This stuff I found to do nothing */
196 outb(dev->curvol, io);
203 mutex_unlock(&dev->lock);
208 if ((a == 0xcf) || (a == 0xdf) /* I found this out by playing */
209 || (a == 0xef)) /* with a binary scanner on the card io */
214 static int zol_is_stereo (struct zol_device *dev)
218 mutex_lock(&dev->lock);
221 outb(dev->curvol, io);
228 mutex_unlock(&dev->lock);
230 if ((x1 == x2) && (x1 == 0xcf))
235 static int vidioc_querycap(struct file *file, void *priv,
236 struct v4l2_capability *v)
238 strlcpy(v->driver, "radio-zoltrix", sizeof(v->driver));
239 strlcpy(v->card, "Zoltrix Radio", sizeof(v->card));
240 sprintf(v->bus_info, "ISA");
241 v->version = RADIO_VERSION;
242 v->capabilities = V4L2_CAP_TUNER;
246 static int vidioc_g_tuner(struct file *file, void *priv,
247 struct v4l2_tuner *v)
249 struct video_device *dev = video_devdata(file);
250 struct zol_device *zol = video_get_drvdata(dev);
255 strcpy(v->name, "FM");
256 v->type = V4L2_TUNER_RADIO;
257 v->rangelow = (88*16000);
258 v->rangehigh = (108*16000);
259 v->rxsubchans = V4L2_TUNER_SUB_MONO|V4L2_TUNER_SUB_STEREO;
260 v->capability = V4L2_TUNER_CAP_LOW;
261 if (zol_is_stereo(zol))
262 v->audmode = V4L2_TUNER_MODE_STEREO;
264 v->audmode = V4L2_TUNER_MODE_MONO;
265 v->signal = 0xFFFF*zol_getsigstr(zol);
269 static int vidioc_s_tuner(struct file *file, void *priv,
270 struct v4l2_tuner *v)
277 static int vidioc_s_frequency(struct file *file, void *priv,
278 struct v4l2_frequency *f)
280 struct video_device *dev = video_devdata(file);
281 struct zol_device *zol = video_get_drvdata(dev);
283 zol->curfreq = f->frequency;
284 zol_setfreq(zol, zol->curfreq);
288 static int vidioc_g_frequency(struct file *file, void *priv,
289 struct v4l2_frequency *f)
291 struct video_device *dev = video_devdata(file);
292 struct zol_device *zol = video_get_drvdata(dev);
294 f->type = V4L2_TUNER_RADIO;
295 f->frequency = zol->curfreq;
299 static int vidioc_queryctrl(struct file *file, void *priv,
300 struct v4l2_queryctrl *qc)
304 for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
305 if (qc->id && qc->id == radio_qctrl[i].id) {
306 memcpy(qc, &(radio_qctrl[i]),
314 static int vidioc_g_ctrl(struct file *file, void *priv,
315 struct v4l2_control *ctrl)
317 struct video_device *dev = video_devdata(file);
318 struct zol_device *zol = video_get_drvdata(dev);
321 case V4L2_CID_AUDIO_MUTE:
322 ctrl->value = zol->muted;
324 case V4L2_CID_AUDIO_VOLUME:
325 ctrl->value = zol->curvol * 4096;
331 static int vidioc_s_ctrl(struct file *file, void *priv,
332 struct v4l2_control *ctrl)
334 struct video_device *dev = video_devdata(file);
335 struct zol_device *zol = video_get_drvdata(dev);
338 case V4L2_CID_AUDIO_MUTE:
343 zol_setvol(zol,zol->curvol);
346 case V4L2_CID_AUDIO_VOLUME:
347 zol_setvol(zol,ctrl->value/4096);
351 zol_setfreq(zol, zol->curfreq);
353 /* FIXME: Implement stereo/mono switch on V4L2 */
354 if (v->mode & VIDEO_SOUND_STEREO) {
356 zol_setfreq(zol, zol->curfreq);
358 if (v->mode & VIDEO_SOUND_MONO) {
360 zol_setfreq(zol, zol->curfreq);
366 static int vidioc_g_audio(struct file *file, void *priv,
367 struct v4l2_audio *a)
372 strcpy(a->name, "Radio");
373 a->capability = V4L2_AUDCAP_STEREO;
377 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
383 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
390 static int vidioc_s_audio(struct file *file, void *priv,
391 struct v4l2_audio *a)
398 static struct zol_device zoltrix_unit;
400 static int zoltrix_exclusive_open(struct inode *inode, struct file *file)
402 return test_and_set_bit(0, &zoltrix_unit.in_use) ? -EBUSY : 0;
405 static int zoltrix_exclusive_release(struct inode *inode, struct file *file)
407 clear_bit(0, &zoltrix_unit.in_use);
411 static const struct file_operations zoltrix_fops =
413 .owner = THIS_MODULE,
414 .open = zoltrix_exclusive_open,
415 .release = zoltrix_exclusive_release,
416 .ioctl = video_ioctl2,
418 .compat_ioctl = v4l_compat_ioctl32,
423 static const struct v4l2_ioctl_ops zoltrix_ioctl_ops = {
424 .vidioc_querycap = vidioc_querycap,
425 .vidioc_g_tuner = vidioc_g_tuner,
426 .vidioc_s_tuner = vidioc_s_tuner,
427 .vidioc_g_audio = vidioc_g_audio,
428 .vidioc_s_audio = vidioc_s_audio,
429 .vidioc_g_input = vidioc_g_input,
430 .vidioc_s_input = vidioc_s_input,
431 .vidioc_g_frequency = vidioc_g_frequency,
432 .vidioc_s_frequency = vidioc_s_frequency,
433 .vidioc_queryctrl = vidioc_queryctrl,
434 .vidioc_g_ctrl = vidioc_g_ctrl,
435 .vidioc_s_ctrl = vidioc_s_ctrl,
438 static struct video_device zoltrix_radio = {
439 .name = "Zoltrix Radio Plus",
440 .fops = &zoltrix_fops,
441 .ioctl_ops = &zoltrix_ioctl_ops,
442 .release = video_device_release_empty,
445 static int __init zoltrix_init(void)
448 printk(KERN_ERR "You must set an I/O address with io=0x???\n");
451 if ((io != 0x20c) && (io != 0x30c)) {
452 printk(KERN_ERR "zoltrix: invalid port, try 0x20c or 0x30c\n");
456 video_set_drvdata(&zoltrix_radio, &zoltrix_unit);
457 if (!request_region(io, 2, "zoltrix")) {
458 printk(KERN_ERR "zoltrix: port 0x%x already in use\n", io);
462 if (video_register_device(&zoltrix_radio, VFL_TYPE_RADIO, radio_nr) < 0) {
463 release_region(io, 2);
466 printk(KERN_INFO "Zoltrix Radio Plus card driver.\n");
468 mutex_init(&zoltrix_unit.lock);
470 /* mute card - prevents noisy bootups */
472 /* this ensures that the volume is all the way down */
479 zoltrix_unit.curvol = 0;
480 zoltrix_unit.stereo = 1;
485 MODULE_AUTHOR("C.van Schaik");
486 MODULE_DESCRIPTION("A driver for the Zoltrix Radio Plus.");
487 MODULE_LICENSE("GPL");
489 module_param(io, int, 0);
490 MODULE_PARM_DESC(io, "I/O address of the Zoltrix Radio Plus (0x20c or 0x30c)");
491 module_param(radio_nr, int, 0);
493 static void __exit zoltrix_cleanup_module(void)
495 video_unregister_device(&zoltrix_radio);
496 release_region(io, 2);
499 module_init(zoltrix_init);
500 module_exit(zoltrix_cleanup_module);