1 /* radio-cadet.c - A video4linux driver for the ADS Cadet AM/FM Radio Card
3 * by Fred Gleason <fredg@wava.com>
6 * (Loosely) based on code for the Aztech radio card by
8 * Russell Kroll (rkroll@exploits.org)
11 * Jason Lewis (jlewis@twilight.vtc.vsc.edu)
12 * Scott McGrath (smcgrath@twilight.vtc.vsc.edu)
13 * William McGrath (wmcgrath@twilight.vtc.vsc.edu)
16 * 2000-04-29 Russell Kroll <rkroll@exploits.org>
17 * Added ISAPnP detection for Linux 2.3/2.4
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)
23 * 2002-01-17 Adam Belay <ambx1@neo.rr.com>
24 * Updated to latest pnp code
26 * 2003-01-31 Alan Cox <alan@lxorguk.ukuu.org.uk>
27 * Cleaned up locking, delay code, general odds and ends
29 * 2006-07-30 Hans J. Koch <koch@hjk-az.de>
33 #include <linux/module.h> /* Modules */
34 #include <linux/init.h> /* Initdata */
35 #include <linux/ioport.h> /* request_region */
36 #include <linux/delay.h> /* udelay */
37 #include <linux/videodev2.h> /* V4L2 API defs */
38 #include <linux/param.h>
39 #include <linux/pnp.h>
40 #include <linux/sched.h>
41 #include <linux/io.h> /* outb, outb_p */
42 #include <media/v4l2-device.h>
43 #include <media/v4l2-ioctl.h>
44 #include <media/v4l2-ctrls.h>
45 #include <media/v4l2-fh.h>
46 #include <media/v4l2-event.h>
48 MODULE_AUTHOR("Fred Gleason, Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
49 MODULE_DESCRIPTION("A driver for the ADS Cadet AM/FM/RDS radio card.");
50 MODULE_LICENSE("GPL");
51 MODULE_VERSION("0.3.4");
53 static int io
= -1; /* default to isapnp activation */
54 static int radio_nr
= -1;
56 module_param(io
, int, 0);
57 MODULE_PARM_DESC(io
, "I/O address of Cadet card (0x330,0x332,0x334,0x336,0x338,0x33a,0x33c,0x33e)");
58 module_param(radio_nr
, int, 0);
60 #define RDS_BUFFER 256
65 struct v4l2_device v4l2_dev
;
66 struct video_device vdev
;
67 struct v4l2_ctrl_handler ctrl_handler
;
73 wait_queue_head_t read_queue
;
74 struct timer_list readtimer
;
75 u8 rdsin
, rdsout
, rdsstat
;
76 unsigned char rdsbuf
[RDS_BUFFER
];
81 static struct cadet cadet_card
;
84 * Signal Strength Threshold Values
85 * The V4L API spec does not define any particular unit for the signal
86 * strength value. These values are in microvolts of RF at the tuner's input.
88 static u16 sigtable
[2][4] = {
89 { 1835, 2621, 4128, 65535 },
90 { 2185, 4369, 13107, 65535 },
93 static const struct v4l2_frequency_band bands
[] = {
96 .type
= V4L2_TUNER_RADIO
,
97 .capability
= V4L2_TUNER_CAP_LOW
| V4L2_TUNER_CAP_FREQ_BANDS
,
98 .rangelow
= 8320, /* 520 kHz */
99 .rangehigh
= 26400, /* 1650 kHz */
100 .modulation
= V4L2_BAND_MODULATION_AM
,
103 .type
= V4L2_TUNER_RADIO
,
104 .capability
= V4L2_TUNER_CAP_STEREO
| V4L2_TUNER_CAP_RDS
|
105 V4L2_TUNER_CAP_RDS_BLOCK_IO
| V4L2_TUNER_CAP_LOW
|
106 V4L2_TUNER_CAP_FREQ_BANDS
,
107 .rangelow
= 1400000, /* 87.5 MHz */
108 .rangehigh
= 1728000, /* 108.0 MHz */
109 .modulation
= V4L2_BAND_MODULATION_FM
,
114 static int cadet_getstereo(struct cadet
*dev
)
116 int ret
= V4L2_TUNER_SUB_MONO
;
118 if (!dev
->is_fm_band
) /* Only FM has stereo capability! */
119 return V4L2_TUNER_SUB_MONO
;
121 outb(7, dev
->io
); /* Select tuner control */
122 if ((inb(dev
->io
+ 1) & 0x40) == 0)
123 ret
= V4L2_TUNER_SUB_STEREO
;
127 static unsigned cadet_gettune(struct cadet
*dev
)
136 outb(7, dev
->io
); /* Select tuner control */
137 curvol
= inb(dev
->io
+ 1); /* Save current volume/mute setting */
138 outb(0x00, dev
->io
+ 1); /* Ensure WRITE-ENABLE is LOW */
139 dev
->tunestat
= 0xffff;
142 * Read the shift register
144 for (i
= 0; i
< 25; i
++) {
145 fifo
= (fifo
<< 1) | ((inb(dev
->io
+ 1) >> 7) & 0x01);
147 outb(0x01, dev
->io
+ 1);
148 dev
->tunestat
&= inb(dev
->io
+ 1);
149 outb(0x00, dev
->io
+ 1);
154 * Restore volume/mute setting
156 outb(curvol
, dev
->io
+ 1);
160 static unsigned cadet_getfreq(struct cadet
*dev
)
163 unsigned freq
= 0, test
, fifo
= 0;
166 * Read current tuning
168 fifo
= cadet_gettune(dev
);
171 * Convert to actual frequency
173 if (!dev
->is_fm_band
) /* AM */
174 return ((fifo
& 0x7fff) - 450) * 16;
177 for (i
= 0; i
< 14; i
++) {
178 if ((fifo
& 0x01) != 0)
183 freq
-= 10700000; /* IF frequency is 10.7 MHz */
184 freq
= (freq
* 16) / 1000; /* Make it 1/16 kHz */
188 static void cadet_settune(struct cadet
*dev
, unsigned fifo
)
193 outb(7, dev
->io
); /* Select tuner control */
195 * Write the shift register
198 test
= (fifo
>> 23) & 0x02; /* Align data for SDO */
199 test
|= 0x1c; /* SDM=1, SWE=1, SEN=1, SCK=0 */
200 outb(7, dev
->io
); /* Select tuner control */
201 outb(test
, dev
->io
+ 1); /* Initialize for write */
202 for (i
= 0; i
< 25; i
++) {
203 test
|= 0x01; /* Toggle SCK High */
204 outb(test
, dev
->io
+ 1);
205 test
&= 0xfe; /* Toggle SCK Low */
206 outb(test
, dev
->io
+ 1);
207 fifo
= fifo
<< 1; /* Prepare the next bit */
208 test
= 0x1c | ((fifo
>> 23) & 0x02);
209 outb(test
, dev
->io
+ 1);
213 static void cadet_setfreq(struct cadet
*dev
, unsigned freq
)
219 freq
= clamp(freq
, bands
[dev
->is_fm_band
].rangelow
,
220 bands
[dev
->is_fm_band
].rangehigh
);
223 * Formulate a fifo command
226 if (dev
->is_fm_band
) { /* FM */
228 freq
= freq
/ 16; /* Make it kHz */
229 freq
+= 10700; /* IF is 10700 kHz */
230 for (i
= 0; i
< 14; i
++) {
239 fifo
= (freq
/ 16) + 450; /* Make it kHz */
240 fifo
|= 0x100000; /* Select AM Band */
244 * Save current volume/mute setting
247 outb(7, dev
->io
); /* Select tuner control */
248 curvol
= inb(dev
->io
+ 1);
253 for (j
= 3; j
> -1; j
--) {
254 cadet_settune(dev
, fifo
| (j
<< 16));
256 outb(7, dev
->io
); /* Select tuner control */
257 outb(curvol
, dev
->io
+ 1);
262 if ((dev
->tunestat
& 0x40) == 0) { /* Tuned */
263 dev
->sigstrength
= sigtable
[dev
->is_fm_band
][j
];
267 dev
->sigstrength
= 0;
270 outb(inb(dev
->io
+ 1) & 0x7f, dev
->io
+ 1);
274 static void cadet_handler(unsigned long data
)
276 struct cadet
*dev
= (void *)data
;
278 /* Service the RDS fifo */
279 if (mutex_trylock(&dev
->lock
)) {
280 outb(0x3, dev
->io
); /* Select RDS Decoder Control */
281 if ((inb(dev
->io
+ 1) & 0x20) != 0)
282 printk(KERN_CRIT
"cadet: RDS fifo overflow\n");
283 outb(0x80, dev
->io
); /* Select RDS fifo */
284 while ((inb(dev
->io
) & 0x80) != 0) {
285 dev
->rdsbuf
[dev
->rdsin
] = inb(dev
->io
+ 1);
286 if (dev
->rdsin
+ 1 == dev
->rdsout
)
287 printk(KERN_WARNING
"cadet: RDS buffer overflow\n");
291 mutex_unlock(&dev
->lock
);
295 * Service pending read
297 if (dev
->rdsin
!= dev
->rdsout
)
298 wake_up_interruptible(&dev
->read_queue
);
303 init_timer(&dev
->readtimer
);
304 dev
->readtimer
.function
= cadet_handler
;
305 dev
->readtimer
.data
= data
;
306 dev
->readtimer
.expires
= jiffies
+ msecs_to_jiffies(50);
307 add_timer(&dev
->readtimer
);
310 static void cadet_start_rds(struct cadet
*dev
)
313 outb(0x80, dev
->io
); /* Select RDS fifo */
314 init_timer(&dev
->readtimer
);
315 dev
->readtimer
.function
= cadet_handler
;
316 dev
->readtimer
.data
= (unsigned long)dev
;
317 dev
->readtimer
.expires
= jiffies
+ msecs_to_jiffies(50);
318 add_timer(&dev
->readtimer
);
321 static ssize_t
cadet_read(struct file
*file
, char __user
*data
, size_t count
, loff_t
*ppos
)
323 struct cadet
*dev
= video_drvdata(file
);
324 unsigned char readbuf
[RDS_BUFFER
];
327 mutex_lock(&dev
->lock
);
328 if (dev
->rdsstat
== 0)
329 cadet_start_rds(dev
);
330 if (dev
->rdsin
== dev
->rdsout
) {
331 if (file
->f_flags
& O_NONBLOCK
) {
335 mutex_unlock(&dev
->lock
);
336 interruptible_sleep_on(&dev
->read_queue
);
337 mutex_lock(&dev
->lock
);
339 while (i
< count
&& dev
->rdsin
!= dev
->rdsout
)
340 readbuf
[i
++] = dev
->rdsbuf
[dev
->rdsout
++];
342 if (i
&& copy_to_user(data
, readbuf
, i
))
345 mutex_unlock(&dev
->lock
);
350 static int vidioc_querycap(struct file
*file
, void *priv
,
351 struct v4l2_capability
*v
)
353 strlcpy(v
->driver
, "ADS Cadet", sizeof(v
->driver
));
354 strlcpy(v
->card
, "ADS Cadet", sizeof(v
->card
));
355 strlcpy(v
->bus_info
, "ISA", sizeof(v
->bus_info
));
356 v
->device_caps
= V4L2_CAP_TUNER
| V4L2_CAP_RADIO
|
357 V4L2_CAP_READWRITE
| V4L2_CAP_RDS_CAPTURE
;
358 v
->capabilities
= v
->device_caps
| V4L2_CAP_DEVICE_CAPS
;
362 static int vidioc_g_tuner(struct file
*file
, void *priv
,
363 struct v4l2_tuner
*v
)
365 struct cadet
*dev
= video_drvdata(file
);
369 v
->type
= V4L2_TUNER_RADIO
;
370 strlcpy(v
->name
, "Radio", sizeof(v
->name
));
371 v
->capability
= bands
[0].capability
| bands
[1].capability
;
372 v
->rangelow
= bands
[0].rangelow
; /* 520 kHz (start of AM band) */
373 v
->rangehigh
= bands
[1].rangehigh
; /* 108.0 MHz (end of FM band) */
374 if (dev
->is_fm_band
) {
375 v
->rxsubchans
= cadet_getstereo(dev
);
377 outb(inb(dev
->io
+ 1) & 0x7f, dev
->io
+ 1);
380 if (inb(dev
->io
+ 1) & 0x80)
381 v
->rxsubchans
|= V4L2_TUNER_SUB_RDS
;
383 v
->rangelow
= 8320; /* 520 kHz */
384 v
->rangehigh
= 26400; /* 1650 kHz */
385 v
->rxsubchans
= V4L2_TUNER_SUB_MONO
;
387 v
->audmode
= V4L2_TUNER_MODE_STEREO
;
388 v
->signal
= dev
->sigstrength
; /* We might need to modify scaling of this */
392 static int vidioc_s_tuner(struct file
*file
, void *priv
,
393 const struct v4l2_tuner
*v
)
395 return v
->index
? -EINVAL
: 0;
398 static int vidioc_enum_freq_bands(struct file
*file
, void *priv
,
399 struct v4l2_frequency_band
*band
)
403 if (band
->index
>= ARRAY_SIZE(bands
))
405 *band
= bands
[band
->index
];
409 static int vidioc_g_frequency(struct file
*file
, void *priv
,
410 struct v4l2_frequency
*f
)
412 struct cadet
*dev
= video_drvdata(file
);
416 f
->type
= V4L2_TUNER_RADIO
;
417 f
->frequency
= dev
->curfreq
;
422 static int vidioc_s_frequency(struct file
*file
, void *priv
,
423 const struct v4l2_frequency
*f
)
425 struct cadet
*dev
= video_drvdata(file
);
430 f
->frequency
>= (bands
[0].rangehigh
+ bands
[1].rangelow
) / 2;
431 cadet_setfreq(dev
, f
->frequency
);
435 static int cadet_s_ctrl(struct v4l2_ctrl
*ctrl
)
437 struct cadet
*dev
= container_of(ctrl
->handler
, struct cadet
, ctrl_handler
);
440 case V4L2_CID_AUDIO_MUTE
:
441 outb(7, dev
->io
); /* Select tuner control */
443 outb(0x00, dev
->io
+ 1);
445 outb(0x20, dev
->io
+ 1);
451 static int cadet_open(struct file
*file
)
453 struct cadet
*dev
= video_drvdata(file
);
456 mutex_lock(&dev
->lock
);
457 err
= v4l2_fh_open(file
);
460 if (v4l2_fh_is_singular_file(file
))
461 init_waitqueue_head(&dev
->read_queue
);
463 mutex_unlock(&dev
->lock
);
467 static int cadet_release(struct file
*file
)
469 struct cadet
*dev
= video_drvdata(file
);
471 mutex_lock(&dev
->lock
);
472 if (v4l2_fh_is_singular_file(file
) && dev
->rdsstat
) {
473 del_timer_sync(&dev
->readtimer
);
476 v4l2_fh_release(file
);
477 mutex_unlock(&dev
->lock
);
481 static unsigned int cadet_poll(struct file
*file
, struct poll_table_struct
*wait
)
483 struct cadet
*dev
= video_drvdata(file
);
484 unsigned long req_events
= poll_requested_events(wait
);
485 unsigned int res
= v4l2_ctrl_poll(file
, wait
);
487 poll_wait(file
, &dev
->read_queue
, wait
);
488 if (dev
->rdsstat
== 0 && (req_events
& (POLLIN
| POLLRDNORM
))) {
489 mutex_lock(&dev
->lock
);
490 if (dev
->rdsstat
== 0)
491 cadet_start_rds(dev
);
492 mutex_unlock(&dev
->lock
);
494 if (dev
->rdsin
!= dev
->rdsout
)
495 res
|= POLLIN
| POLLRDNORM
;
500 static const struct v4l2_file_operations cadet_fops
= {
501 .owner
= THIS_MODULE
,
503 .release
= cadet_release
,
505 .unlocked_ioctl
= video_ioctl2
,
509 static const struct v4l2_ioctl_ops cadet_ioctl_ops
= {
510 .vidioc_querycap
= vidioc_querycap
,
511 .vidioc_g_tuner
= vidioc_g_tuner
,
512 .vidioc_s_tuner
= vidioc_s_tuner
,
513 .vidioc_g_frequency
= vidioc_g_frequency
,
514 .vidioc_s_frequency
= vidioc_s_frequency
,
515 .vidioc_enum_freq_bands
= vidioc_enum_freq_bands
,
516 .vidioc_log_status
= v4l2_ctrl_log_status
,
517 .vidioc_subscribe_event
= v4l2_ctrl_subscribe_event
,
518 .vidioc_unsubscribe_event
= v4l2_event_unsubscribe
,
521 static const struct v4l2_ctrl_ops cadet_ctrl_ops
= {
522 .s_ctrl
= cadet_s_ctrl
,
527 static struct pnp_device_id cadet_pnp_devices
[] = {
528 /* ADS Cadet AM/FM Radio Card */
529 {.id
= "MSM0c24", .driver_data
= 0},
533 MODULE_DEVICE_TABLE(pnp
, cadet_pnp_devices
);
535 static int cadet_pnp_probe(struct pnp_dev
*dev
, const struct pnp_device_id
*dev_id
)
539 /* only support one device */
543 if (!pnp_port_valid(dev
, 0))
546 io
= pnp_port_start(dev
, 0);
548 printk(KERN_INFO
"radio-cadet: PnP reports device at %#x\n", io
);
553 static struct pnp_driver cadet_pnp_driver
= {
554 .name
= "radio-cadet",
555 .id_table
= cadet_pnp_devices
,
556 .probe
= cadet_pnp_probe
,
561 static struct pnp_driver cadet_pnp_driver
;
564 static void cadet_probe(struct cadet
*dev
)
566 static int iovals
[8] = { 0x330, 0x332, 0x334, 0x336, 0x338, 0x33a, 0x33c, 0x33e };
569 for (i
= 0; i
< 8; i
++) {
571 if (request_region(dev
->io
, 2, "cadet-probe")) {
572 cadet_setfreq(dev
, bands
[1].rangelow
);
573 if (cadet_getfreq(dev
) == bands
[1].rangelow
) {
574 release_region(dev
->io
, 2);
577 release_region(dev
->io
, 2);
584 * io should only be set if the user has used something like
585 * isapnp (the userspace program) to initialize this card for us
588 static int __init
cadet_init(void)
590 struct cadet
*dev
= &cadet_card
;
591 struct v4l2_device
*v4l2_dev
= &dev
->v4l2_dev
;
592 struct v4l2_ctrl_handler
*hdl
;
595 strlcpy(v4l2_dev
->name
, "cadet", sizeof(v4l2_dev
->name
));
596 mutex_init(&dev
->lock
);
598 /* If a probe was requested then probe ISAPnP first (safest) */
600 pnp_register_driver(&cadet_pnp_driver
);
603 /* If that fails then probe unsafely if probe is requested */
607 /* Else we bail out */
610 v4l2_err(v4l2_dev
, "you must set an I/O address with io=0x330, 0x332, 0x334,\n");
611 v4l2_err(v4l2_dev
, "0x336, 0x338, 0x33a, 0x33c or 0x33e\n");
615 if (!request_region(dev
->io
, 2, "cadet"))
618 res
= v4l2_device_register(NULL
, v4l2_dev
);
620 release_region(dev
->io
, 2);
621 v4l2_err(v4l2_dev
, "could not register v4l2_device\n");
625 hdl
= &dev
->ctrl_handler
;
626 v4l2_ctrl_handler_init(hdl
, 2);
627 v4l2_ctrl_new_std(hdl
, &cadet_ctrl_ops
,
628 V4L2_CID_AUDIO_MUTE
, 0, 1, 1, 1);
629 v4l2_dev
->ctrl_handler
= hdl
;
632 v4l2_err(v4l2_dev
, "Could not register controls\n");
636 dev
->is_fm_band
= true;
637 dev
->curfreq
= bands
[dev
->is_fm_band
].rangelow
;
638 cadet_setfreq(dev
, dev
->curfreq
);
639 strlcpy(dev
->vdev
.name
, v4l2_dev
->name
, sizeof(dev
->vdev
.name
));
640 dev
->vdev
.v4l2_dev
= v4l2_dev
;
641 dev
->vdev
.fops
= &cadet_fops
;
642 dev
->vdev
.ioctl_ops
= &cadet_ioctl_ops
;
643 dev
->vdev
.release
= video_device_release_empty
;
644 dev
->vdev
.lock
= &dev
->lock
;
645 set_bit(V4L2_FL_USE_FH_PRIO
, &dev
->vdev
.flags
);
646 video_set_drvdata(&dev
->vdev
, dev
);
648 res
= video_register_device(&dev
->vdev
, VFL_TYPE_RADIO
, radio_nr
);
651 v4l2_info(v4l2_dev
, "ADS Cadet Radio Card at 0x%x\n", dev
->io
);
654 v4l2_ctrl_handler_free(hdl
);
655 v4l2_device_unregister(v4l2_dev
);
656 release_region(dev
->io
, 2);
658 pnp_unregister_driver(&cadet_pnp_driver
);
662 static void __exit
cadet_exit(void)
664 struct cadet
*dev
= &cadet_card
;
666 video_unregister_device(&dev
->vdev
);
667 v4l2_ctrl_handler_free(&dev
->ctrl_handler
);
668 v4l2_device_unregister(&dev
->v4l2_dev
);
669 outb(7, dev
->io
); /* Mute */
670 outb(0x00, dev
->io
+ 1);
671 release_region(dev
->io
, 2);
672 pnp_unregister_driver(&cadet_pnp_driver
);
675 module_init(cadet_init
);
676 module_exit(cadet_exit
);