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[cor_2_6_31.git] / drivers / media / radio / radio-cadet.c
blobd30fc0ce82c08f093dc48d13052994eaedafbc87
1 /* radio-cadet.c - A video4linux driver for the ADS Cadet AM/FM Radio Card
2 *
3 * by Fred Gleason <fredg@wava.com>
4 * Version 0.3.3
5 *
6 * (Loosely) based on code for the Aztech radio card by
7 *
8 * Russell Kroll (rkroll@exploits.org)
9 * Quay Ly
10 * Donald Song
11 * Jason Lewis (jlewis@twilight.vtc.vsc.edu)
12 * Scott McGrath (smcgrath@twilight.vtc.vsc.edu)
13 * William McGrath (wmcgrath@twilight.vtc.vsc.edu)
14 *
15 * History:
16 * 2000-04-29 Russell Kroll <rkroll@exploits.org>
17 * Added ISAPnP detection for Linux 2.3/2.4
18 *
19 * 2001-01-10 Russell Kroll <rkroll@exploits.org>
20 * Removed dead CONFIG_RADIO_CADET_PORT code
21 * PnP detection on load is now default (no args necessary)
22 *
23 * 2002-01-17 Adam Belay <ambx1@neo.rr.com>
24 * Updated to latest pnp code
25 *
26 * 2003-01-31 Alan Cox <alan@lxorguk.ukuu.org.uk>
27 * Cleaned up locking, delay code, general odds and ends
28 *
29 * 2006-07-30 Hans J. Koch <koch@hjk-az.de>
30 * Changed API to V4L2
31 */
32
33 #include <linux/version.h>
34 #include <linux/module.h> /* Modules */
35 #include <linux/init.h> /* Initdata */
36 #include <linux/ioport.h> /* request_region */
37 #include <linux/delay.h> /* udelay */
38 #include <linux/videodev2.h> /* V4L2 API defs */
39 #include <linux/param.h>
40 #include <linux/pnp.h>
41 #include <linux/io.h> /* outb, outb_p */
42 #include <media/v4l2-device.h>
43 #include <media/v4l2-ioctl.h>
44
45 MODULE_AUTHOR("Fred Gleason, Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
46 MODULE_DESCRIPTION("A driver for the ADS Cadet AM/FM/RDS radio card.");
47 MODULE_LICENSE("GPL");
48
49 static int io = -1; /* default to isapnp activation */
50 static int radio_nr = -1;
51
52 module_param(io, int, 0);
53 MODULE_PARM_DESC(io, "I/O address of Cadet card (0x330,0x332,0x334,0x336,0x338,0x33a,0x33c,0x33e)");
54 module_param(radio_nr, int, 0);
55
56 #define CADET_VERSION KERNEL_VERSION(0, 3, 3)
57
58 #define RDS_BUFFER 256
59 #define RDS_RX_FLAG 1
60 #define MBS_RX_FLAG 2
61
62 struct cadet {
63 struct v4l2_device v4l2_dev;
64 struct video_device vdev;
65 int io;
66 int users;
67 int curtuner;
68 int tunestat;
69 int sigstrength;
70 wait_queue_head_t read_queue;
71 struct timer_list readtimer;
72 __u8 rdsin, rdsout, rdsstat;
73 unsigned char rdsbuf[RDS_BUFFER];
74 struct mutex lock;
75 int reading;
76 };
77
78 static struct cadet cadet_card;
79
80 /*
81 * Signal Strength Threshold Values
82 * The V4L API spec does not define any particular unit for the signal
83 * strength value. These values are in microvolts of RF at the tuner's input.
84 */
85 static __u16 sigtable[2][4] = {
86 { 5, 10, 30, 150 },
87 { 28, 40, 63, 1000 }
88 };
89
90
91 static int cadet_getstereo(struct cadet *dev)
92 {
93 int ret = V4L2_TUNER_SUB_MONO;
94
95 if (dev->curtuner != 0) /* Only FM has stereo capability! */
96 return V4L2_TUNER_SUB_MONO;
97
98 mutex_lock(&dev->lock);
99 outb(7, dev->io); /* Select tuner control */
100 if ((inb(dev->io + 1) & 0x40) == 0)
101 ret = V4L2_TUNER_SUB_STEREO;
102 mutex_unlock(&dev->lock);
103 return ret;
104 }
105
106 static unsigned cadet_gettune(struct cadet *dev)
107 {
108 int curvol, i;
109 unsigned fifo = 0;
110
111 /*
112 * Prepare for read
113 */
114
115 mutex_lock(&dev->lock);
116
117 outb(7, dev->io); /* Select tuner control */
118 curvol = inb(dev->io + 1); /* Save current volume/mute setting */
119 outb(0x00, dev->io + 1); /* Ensure WRITE-ENABLE is LOW */
120 dev->tunestat = 0xffff;
121
122 /*
123 * Read the shift register
124 */
125 for (i = 0; i < 25; i++) {
126 fifo = (fifo << 1) | ((inb(dev->io + 1) >> 7) & 0x01);
127 if (i < 24) {
128 outb(0x01, dev->io + 1);
129 dev->tunestat &= inb(dev->io + 1);
130 outb(0x00, dev->io + 1);
131 }
132 }
133
134 /*
135 * Restore volume/mute setting
136 */
137 outb(curvol, dev->io + 1);
138 mutex_unlock(&dev->lock);
139
140 return fifo;
141 }
142
143 static unsigned cadet_getfreq(struct cadet *dev)
144 {
145 int i;
146 unsigned freq = 0, test, fifo = 0;
147
148 /*
149 * Read current tuning
150 */
151 fifo = cadet_gettune(dev);
152
153 /*
154 * Convert to actual frequency
155 */
156 if (dev->curtuner == 0) { /* FM */
157 test = 12500;
158 for (i = 0; i < 14; i++) {
159 if ((fifo & 0x01) != 0)
160 freq += test;
161 test = test << 1;
162 fifo = fifo >> 1;
163 }
164 freq -= 10700000; /* IF frequency is 10.7 MHz */
165 freq = (freq * 16) / 1000000; /* Make it 1/16 MHz */
166 }
167 if (dev->curtuner == 1) /* AM */
168 freq = ((fifo & 0x7fff) - 2010) * 16;
169
170 return freq;
171 }
172
173 static void cadet_settune(struct cadet *dev, unsigned fifo)
174 {
175 int i;
176 unsigned test;
177
178 mutex_lock(&dev->lock);
179
180 outb(7, dev->io); /* Select tuner control */
181 /*
182 * Write the shift register
183 */
184 test = 0;
185 test = (fifo >> 23) & 0x02; /* Align data for SDO */
186 test |= 0x1c; /* SDM=1, SWE=1, SEN=1, SCK=0 */
187 outb(7, dev->io); /* Select tuner control */
188 outb(test, dev->io + 1); /* Initialize for write */
189 for (i = 0; i < 25; i++) {
190 test |= 0x01; /* Toggle SCK High */
191 outb(test, dev->io + 1);
192 test &= 0xfe; /* Toggle SCK Low */
193 outb(test, dev->io + 1);
194 fifo = fifo << 1; /* Prepare the next bit */
195 test = 0x1c | ((fifo >> 23) & 0x02);
196 outb(test, dev->io + 1);
197 }
198 mutex_unlock(&dev->lock);
199 }
200
201 static void cadet_setfreq(struct cadet *dev, unsigned freq)
202 {
203 unsigned fifo;
204 int i, j, test;
205 int curvol;
206
207 /*
208 * Formulate a fifo command
209 */
210 fifo = 0;
211 if (dev->curtuner == 0) { /* FM */
212 test = 102400;
213 freq = (freq * 1000) / 16; /* Make it kHz */
214 freq += 10700; /* IF is 10700 kHz */
215 for (i = 0; i < 14; i++) {
216 fifo = fifo << 1;
217 if (freq >= test) {
218 fifo |= 0x01;
219 freq -= test;
220 }
221 test = test >> 1;
222 }
223 }
224 if (dev->curtuner == 1) { /* AM */
225 fifo = (freq / 16) + 2010; /* Make it kHz */
226 fifo |= 0x100000; /* Select AM Band */
227 }
228
229 /*
230 * Save current volume/mute setting
231 */
232
233 mutex_lock(&dev->lock);
234 outb(7, dev->io); /* Select tuner control */
235 curvol = inb(dev->io + 1);
236 mutex_unlock(&dev->lock);
237
238 /*
239 * Tune the card
240 */
241 for (j = 3; j > -1; j--) {
242 cadet_settune(dev, fifo | (j << 16));
243
244 mutex_lock(&dev->lock);
245 outb(7, dev->io); /* Select tuner control */
246 outb(curvol, dev->io + 1);
247 mutex_unlock(&dev->lock);
248
249 msleep(100);
250
251 cadet_gettune(dev);
252 if ((dev->tunestat & 0x40) == 0) { /* Tuned */
253 dev->sigstrength = sigtable[dev->curtuner][j];
254 return;
255 }
256 }
257 dev->sigstrength = 0;
258 }
259
260
261 static int cadet_getvol(struct cadet *dev)
262 {
263 int ret = 0;
264
265 mutex_lock(&dev->lock);
266
267 outb(7, dev->io); /* Select tuner control */
268 if ((inb(dev->io + 1) & 0x20) != 0)
269 ret = 0xffff;
270
271 mutex_unlock(&dev->lock);
272 return ret;
273 }
274
275
276 static void cadet_setvol(struct cadet *dev, int vol)
277 {
278 mutex_lock(&dev->lock);
279 outb(7, dev->io); /* Select tuner control */
280 if (vol > 0)
281 outb(0x20, dev->io + 1);
282 else
283 outb(0x00, dev->io + 1);
284 mutex_unlock(&dev->lock);
285 }
286
287 static void cadet_handler(unsigned long data)
288 {
289 struct cadet *dev = (void *)data;
290
291 /* Service the RDS fifo */
292 if (mutex_trylock(&dev->lock)) {
293 outb(0x3, dev->io); /* Select RDS Decoder Control */
294 if ((inb(dev->io + 1) & 0x20) != 0)
295 printk(KERN_CRIT "cadet: RDS fifo overflow\n");
296 outb(0x80, dev->io); /* Select RDS fifo */
297 while ((inb(dev->io) & 0x80) != 0) {
298 dev->rdsbuf[dev->rdsin] = inb(dev->io + 1);
299 if (dev->rdsin == dev->rdsout)
300 printk(KERN_WARNING "cadet: RDS buffer overflow\n");
301 else
302 dev->rdsin++;
303 }
304 mutex_unlock(&dev->lock);
305 }
306
307 /*
308 * Service pending read
309 */
310 if (dev->rdsin != dev->rdsout)
311 wake_up_interruptible(&dev->read_queue);
312
313 /*
314 * Clean up and exit
315 */
316 init_timer(&dev->readtimer);
317 dev->readtimer.function = cadet_handler;
318 dev->readtimer.data = (unsigned long)0;
319 dev->readtimer.expires = jiffies + msecs_to_jiffies(50);
320 add_timer(&dev->readtimer);
321 }
322
323
324 static ssize_t cadet_read(struct file *file, char __user *data, size_t count, loff_t *ppos)
325 {
326 struct cadet *dev = video_drvdata(file);
327 unsigned char readbuf[RDS_BUFFER];
328 int i = 0;
329
330 if (dev->rdsstat == 0) {
331 mutex_lock(&dev->lock);
332 dev->rdsstat = 1;
333 outb(0x80, dev->io); /* Select RDS fifo */
334 mutex_unlock(&dev->lock);
335 init_timer(&dev->readtimer);
336 dev->readtimer.function = cadet_handler;
337 dev->readtimer.data = (unsigned long)dev;
338 dev->readtimer.expires = jiffies + msecs_to_jiffies(50);
339 add_timer(&dev->readtimer);
340 }
341 if (dev->rdsin == dev->rdsout) {
342 if (file->f_flags & O_NONBLOCK)
343 return -EWOULDBLOCK;
344 interruptible_sleep_on(&dev->read_queue);
345 }
346 while (i < count && dev->rdsin != dev->rdsout)
347 readbuf[i++] = dev->rdsbuf[dev->rdsout++];
348
349 if (copy_to_user(data, readbuf, i))
350 return -EFAULT;
351 return i;
352 }
353
354
355 static int vidioc_querycap(struct file *file, void *priv,
356 struct v4l2_capability *v)
357 {
358 strlcpy(v->driver, "ADS Cadet", sizeof(v->driver));
359 strlcpy(v->card, "ADS Cadet", sizeof(v->card));
360 strlcpy(v->bus_info, "ISA", sizeof(v->bus_info));
361 v->version = CADET_VERSION;
362 v->capabilities = V4L2_CAP_TUNER | V4L2_CAP_RADIO | V4L2_CAP_READWRITE;
363 return 0;
364 }
365
366 static int vidioc_g_tuner(struct file *file, void *priv,
367 struct v4l2_tuner *v)
368 {
369 struct cadet *dev = video_drvdata(file);
370
371 v->type = V4L2_TUNER_RADIO;
372 switch (v->index) {
373 case 0:
374 strlcpy(v->name, "FM", sizeof(v->name));
375 v->capability = V4L2_TUNER_CAP_STEREO;
376 v->rangelow = 1400; /* 87.5 MHz */
377 v->rangehigh = 1728; /* 108.0 MHz */
378 v->rxsubchans = cadet_getstereo(dev);
379 switch (v->rxsubchans) {
380 case V4L2_TUNER_SUB_MONO:
381 v->audmode = V4L2_TUNER_MODE_MONO;
382 break;
383 case V4L2_TUNER_SUB_STEREO:
384 v->audmode = V4L2_TUNER_MODE_STEREO;
385 break;
386 default:
387 break;
388 }
389 break;
390 case 1:
391 strlcpy(v->name, "AM", sizeof(v->name));
392 v->capability = V4L2_TUNER_CAP_LOW;
393 v->rangelow = 8320; /* 520 kHz */
394 v->rangehigh = 26400; /* 1650 kHz */
395 v->rxsubchans = V4L2_TUNER_SUB_MONO;
396 v->audmode = V4L2_TUNER_MODE_MONO;
397 break;
398 default:
399 return -EINVAL;
400 }
401 v->signal = dev->sigstrength; /* We might need to modify scaling of this */
402 return 0;
403 }
404
405 static int vidioc_s_tuner(struct file *file, void *priv,
406 struct v4l2_tuner *v)
407 {
408 struct cadet *dev = video_drvdata(file);
409
410 if (v->index != 0 && v->index != 1)
411 return -EINVAL;
412 dev->curtuner = v->index;
413 return 0;
414 }
415
416 static int vidioc_g_frequency(struct file *file, void *priv,
417 struct v4l2_frequency *f)
418 {
419 struct cadet *dev = video_drvdata(file);
420
421 f->tuner = dev->curtuner;
422 f->type = V4L2_TUNER_RADIO;
423 f->frequency = cadet_getfreq(dev);
424 return 0;
425 }
426
427
428 static int vidioc_s_frequency(struct file *file, void *priv,
429 struct v4l2_frequency *f)
430 {
431 struct cadet *dev = video_drvdata(file);
432
433 if (f->type != V4L2_TUNER_RADIO)
434 return -EINVAL;
435 if (dev->curtuner == 0 && (f->frequency < 1400 || f->frequency > 1728))
436 return -EINVAL;
437 if (dev->curtuner == 1 && (f->frequency < 8320 || f->frequency > 26400))
438 return -EINVAL;
439 cadet_setfreq(dev, f->frequency);
440 return 0;
441 }
442
443 static int vidioc_queryctrl(struct file *file, void *priv,
444 struct v4l2_queryctrl *qc)
445 {
446 switch (qc->id) {
447 case V4L2_CID_AUDIO_MUTE:
448 return v4l2_ctrl_query_fill(qc, 0, 1, 1, 1);
449 case V4L2_CID_AUDIO_VOLUME:
450 return v4l2_ctrl_query_fill(qc, 0, 0xff, 1, 0xff);
451 }
452 return -EINVAL;
453 }
454
455 static int vidioc_g_ctrl(struct file *file, void *priv,
456 struct v4l2_control *ctrl)
457 {
458 struct cadet *dev = video_drvdata(file);
459
460 switch (ctrl->id) {
461 case V4L2_CID_AUDIO_MUTE: /* TODO: Handle this correctly */
462 ctrl->value = (cadet_getvol(dev) == 0);
463 break;
464 case V4L2_CID_AUDIO_VOLUME:
465 ctrl->value = cadet_getvol(dev);
466 break;
467 default:
468 return -EINVAL;
469 }
470 return 0;
471 }
472
473 static int vidioc_s_ctrl(struct file *file, void *priv,
474 struct v4l2_control *ctrl)
475 {
476 struct cadet *dev = video_drvdata(file);
477
478 switch (ctrl->id){
479 case V4L2_CID_AUDIO_MUTE: /* TODO: Handle this correctly */
480 if (ctrl->value)
481 cadet_setvol(dev, 0);
482 else
483 cadet_setvol(dev, 0xffff);
484 break;
485 case V4L2_CID_AUDIO_VOLUME:
486 cadet_setvol(dev, ctrl->value);
487 break;
488 default:
489 return -EINVAL;
490 }
491 return 0;
492 }
493
494 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
495 {
496 *i = 0;
497 return 0;
498 }
499
500 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
501 {
502 return i ? -EINVAL : 0;
503 }
504
505 static int vidioc_g_audio(struct file *file, void *priv,
506 struct v4l2_audio *a)
507 {
508 a->index = 0;
509 strlcpy(a->name, "Radio", sizeof(a->name));
510 a->capability = V4L2_AUDCAP_STEREO;
511 return 0;
512 }
513
514 static int vidioc_s_audio(struct file *file, void *priv,
515 struct v4l2_audio *a)
516 {
517 return a->index ? -EINVAL : 0;
518 }
519
520 static int cadet_open(struct file *file)
521 {
522 struct cadet *dev = video_drvdata(file);
523
524 dev->users++;
525 if (1 == dev->users)
526 init_waitqueue_head(&dev->read_queue);
527 return 0;
528 }
529
530 static int cadet_release(struct file *file)
531 {
532 struct cadet *dev = video_drvdata(file);
533
534 dev->users--;
535 if (0 == dev->users) {
536 del_timer_sync(&dev->readtimer);
537 dev->rdsstat = 0;
538 }
539 return 0;
540 }
541
542 static unsigned int cadet_poll(struct file *file, struct poll_table_struct *wait)
543 {
544 struct cadet *dev = video_drvdata(file);
545
546 poll_wait(file, &dev->read_queue, wait);
547 if (dev->rdsin != dev->rdsout)
548 return POLLIN | POLLRDNORM;
549 return 0;
550 }
551
552
553 static const struct v4l2_file_operations cadet_fops = {
554 .owner = THIS_MODULE,
555 .open = cadet_open,
556 .release = cadet_release,
557 .read = cadet_read,
558 .ioctl = video_ioctl2,
559 .poll = cadet_poll,
560 };
561
562 static const struct v4l2_ioctl_ops cadet_ioctl_ops = {
563 .vidioc_querycap = vidioc_querycap,
564 .vidioc_g_tuner = vidioc_g_tuner,
565 .vidioc_s_tuner = vidioc_s_tuner,
566 .vidioc_g_frequency = vidioc_g_frequency,
567 .vidioc_s_frequency = vidioc_s_frequency,
568 .vidioc_queryctrl = vidioc_queryctrl,
569 .vidioc_g_ctrl = vidioc_g_ctrl,
570 .vidioc_s_ctrl = vidioc_s_ctrl,
571 .vidioc_g_audio = vidioc_g_audio,
572 .vidioc_s_audio = vidioc_s_audio,
573 .vidioc_g_input = vidioc_g_input,
574 .vidioc_s_input = vidioc_s_input,
575 };
576
577 #ifdef CONFIG_PNP
578
579 static struct pnp_device_id cadet_pnp_devices[] = {
580 /* ADS Cadet AM/FM Radio Card */
581 {.id = "MSM0c24", .driver_data = 0},
582 {.id = ""}
583 };
584
585 MODULE_DEVICE_TABLE(pnp, cadet_pnp_devices);
586
587 static int cadet_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id)
588 {
589 if (!dev)
590 return -ENODEV;
591 /* only support one device */
592 if (io > 0)
593 return -EBUSY;
594
595 if (!pnp_port_valid(dev, 0))
596 return -ENODEV;
597
598 io = pnp_port_start(dev, 0);
599
600 printk(KERN_INFO "radio-cadet: PnP reports device at %#x\n", io);
601
602 return io;
603 }
604
605 static struct pnp_driver cadet_pnp_driver = {
606 .name = "radio-cadet",
607 .id_table = cadet_pnp_devices,
608 .probe = cadet_pnp_probe,
609 .remove = NULL,
610 };
611
612 #else
613 static struct pnp_driver cadet_pnp_driver;
614 #endif
615
616 static void cadet_probe(struct cadet *dev)
617 {
618 static int iovals[8] = { 0x330, 0x332, 0x334, 0x336, 0x338, 0x33a, 0x33c, 0x33e };
619 int i;
620
621 for (i = 0; i < 8; i++) {
622 dev->io = iovals[i];
623 if (request_region(dev->io, 2, "cadet-probe")) {
624 cadet_setfreq(dev, 1410);
625 if (cadet_getfreq(dev) == 1410) {
626 release_region(dev->io, 2);
627 return;
628 }
629 release_region(dev->io, 2);
630 }
631 }
632 dev->io = -1;
633 }
634
635 /*
636 * io should only be set if the user has used something like
637 * isapnp (the userspace program) to initialize this card for us
638 */
639
640 static int __init cadet_init(void)
641 {
642 struct cadet *dev = &cadet_card;
643 struct v4l2_device *v4l2_dev = &dev->v4l2_dev;
644 int res;
645
646 strlcpy(v4l2_dev->name, "cadet", sizeof(v4l2_dev->name));
647 mutex_init(&dev->lock);
648
649 /* If a probe was requested then probe ISAPnP first (safest) */
650 if (io < 0)
651 pnp_register_driver(&cadet_pnp_driver);
652 dev->io = io;
653
654 /* If that fails then probe unsafely if probe is requested */
655 if (dev->io < 0)
656 cadet_probe(dev);
657
658 /* Else we bail out */
659 if (dev->io < 0) {
660 #ifdef MODULE
661 v4l2_err(v4l2_dev, "you must set an I/O address with io=0x330, 0x332, 0x334,\n");
662 v4l2_err(v4l2_dev, "0x336, 0x338, 0x33a, 0x33c or 0x33e\n");
663 #endif
664 goto fail;
665 }
666 if (!request_region(dev->io, 2, "cadet"))
667 goto fail;
668
669 res = v4l2_device_register(NULL, v4l2_dev);
670 if (res < 0) {
671 release_region(dev->io, 2);
672 v4l2_err(v4l2_dev, "could not register v4l2_device\n");
673 goto fail;
674 }
675
676 strlcpy(dev->vdev.name, v4l2_dev->name, sizeof(dev->vdev.name));
677 dev->vdev.v4l2_dev = v4l2_dev;
678 dev->vdev.fops = &cadet_fops;
679 dev->vdev.ioctl_ops = &cadet_ioctl_ops;
680 dev->vdev.release = video_device_release_empty;
681 video_set_drvdata(&dev->vdev, dev);
682
683 if (video_register_device(&dev->vdev, VFL_TYPE_RADIO, radio_nr) < 0) {
684 v4l2_device_unregister(v4l2_dev);
685 release_region(dev->io, 2);
686 goto fail;
687 }
688 v4l2_info(v4l2_dev, "ADS Cadet Radio Card at 0x%x\n", dev->io);
689 return 0;
690 fail:
691 pnp_unregister_driver(&cadet_pnp_driver);
692 return -ENODEV;
693 }
694
695 static void __exit cadet_exit(void)
696 {
697 struct cadet *dev = &cadet_card;
698
699 video_unregister_device(&dev->vdev);
700 v4l2_device_unregister(&dev->v4l2_dev);
701 release_region(dev->io, 2);
702 pnp_unregister_driver(&cadet_pnp_driver);
703 }
704
705 module_init(cadet_init);
706 module_exit(cadet_exit);
707
connection oriented routing - ARCHIVE NO UPDATES HERE