1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Miro PCM20 radio driver for Linux radio support
4 * (c) 1998 Ruurd Reitsma <R.A.Reitsma@wbmt.tudelft.nl>
5 * Thanks to Norberto Pellici for the ACI device interface specification
6 * The API part is based on the radiotrack driver by M. Kirkwood
7 * This driver relies on the aci mixer provided by the snd-miro
8 * ALSA driver.
9 * Look there for further info...
10 *
11 * From the original miro RDS sources:
12 *
13 * (c) 2001 Robert Siemer <Robert.Siemer@gmx.de>
14 *
15 * Many thanks to Fred Seidel <seidel@metabox.de>, the
16 * designer of the RDS decoder hardware. With his help
17 * I was able to code this driver.
18 * Thanks also to Norberto Pellicci, Dominic Mounteney
19 * <DMounteney@pinnaclesys.com> and www.teleauskunft.de
20 * for good hints on finding Fred. It was somewhat hard
21 * to locate him here in Germany... [:
22 *
23 * This code has been reintroduced and converted to use
24 * the new V4L2 RDS API by:
25 *
26 * Hans Verkuil <hans.verkuil@cisco.com>
27 */
28
29 #include <linux/module.h>
30 #include <linux/init.h>
31 #include <linux/io.h>
32 #include <linux/delay.h>
33 #include <linux/videodev2.h>
34 #include <linux/kthread.h>
35 #include <media/v4l2-device.h>
36 #include <media/v4l2-ioctl.h>
37 #include <media/v4l2-ctrls.h>
38 #include <media/v4l2-fh.h>
39 #include <media/v4l2-event.h>
40 #include <sound/aci.h>
41
42 #define RDS_DATASHIFT 2 /* Bit 2 */
43 #define RDS_DATAMASK (1 << RDS_DATASHIFT)
44 #define RDS_BUSYMASK 0x10 /* Bit 4 */
45 #define RDS_CLOCKMASK 0x08 /* Bit 3 */
46 #define RDS_DATA(x) (((x) >> RDS_DATASHIFT) & 1)
47
48 #define RDS_STATUS 0x01
49 #define RDS_STATIONNAME 0x02
50 #define RDS_TEXT 0x03
51 #define RDS_ALTFREQ 0x04
52 #define RDS_TIMEDATE 0x05
53 #define RDS_PI_CODE 0x06
54 #define RDS_PTYTATP 0x07
55 #define RDS_RESET 0x08
56 #define RDS_RXVALUE 0x09
57
58 static int radio_nr = -1;
59 module_param(radio_nr, int, 0);
60 MODULE_PARM_DESC(radio_nr, "Set radio device number (/dev/radioX). Default: -1 (autodetect)");
61
62 struct pcm20 {
63 struct v4l2_device v4l2_dev;
64 struct video_device vdev;
65 struct v4l2_ctrl_handler ctrl_handler;
66 struct v4l2_ctrl *rds_pty;
67 struct v4l2_ctrl *rds_ps_name;
68 struct v4l2_ctrl *rds_radio_test;
69 struct v4l2_ctrl *rds_ta;
70 struct v4l2_ctrl *rds_tp;
71 struct v4l2_ctrl *rds_ms;
72 /* thread for periodic RDS status checking */
73 struct task_struct *kthread;
74 unsigned long freq;
75 u32 audmode;
76 struct snd_miro_aci *aci;
77 struct mutex lock;
78 };
79
80 static struct pcm20 pcm20_card = {
81 .freq = 87 * 16000,
82 .audmode = V4L2_TUNER_MODE_STEREO,
83 };
84
85
rds_waitread(struct snd_miro_aci * aci)86 static int rds_waitread(struct snd_miro_aci *aci)
87 {
88 u8 byte;
89 int i = 2000;
90
91 do {
92 byte = inb(aci->aci_port + ACI_REG_RDS);
93 i--;
94 } while ((byte & RDS_BUSYMASK) && i);
95
96 /*
97 * It's magic, but without this the data that you read later on
98 * is unreliable and full of bit errors. With this 1 usec delay
99 * everything is fine.
100 */
101 udelay(1);
102 return i ? byte : -1;
103 }
104
rds_rawwrite(struct snd_miro_aci * aci,u8 byte)105 static int rds_rawwrite(struct snd_miro_aci *aci, u8 byte)
106 {
107 if (rds_waitread(aci) >= 0) {
108 outb(byte, aci->aci_port + ACI_REG_RDS);
109 return 0;
110 }
111 return -1;
112 }
113
rds_write(struct snd_miro_aci * aci,u8 byte)114 static int rds_write(struct snd_miro_aci *aci, u8 byte)
115 {
116 u8 sendbuffer[8];
117 int i;
118
119 for (i = 7; i >= 0; i--)
120 sendbuffer[7 - i] = (byte & (1 << i)) ? RDS_DATAMASK : 0;
121 sendbuffer[0] |= RDS_CLOCKMASK;
122
123 for (i = 0; i < 8; i++)
124 rds_rawwrite(aci, sendbuffer[i]);
125 return 0;
126 }
127
rds_readcycle_nowait(struct snd_miro_aci * aci)128 static int rds_readcycle_nowait(struct snd_miro_aci *aci)
129 {
130 outb(0, aci->aci_port + ACI_REG_RDS);
131 return rds_waitread(aci);
132 }
133
rds_readcycle(struct snd_miro_aci * aci)134 static int rds_readcycle(struct snd_miro_aci *aci)
135 {
136 if (rds_rawwrite(aci, 0) < 0)
137 return -1;
138 return rds_waitread(aci);
139 }
140
rds_ack(struct snd_miro_aci * aci)141 static int rds_ack(struct snd_miro_aci *aci)
142 {
143 int i = rds_readcycle(aci);
144
145 if (i < 0)
146 return -1;
147 if (i & RDS_DATAMASK)
148 return 0; /* ACK */
149 return 1; /* NACK */
150 }
151
rds_cmd(struct snd_miro_aci * aci,u8 cmd,u8 databuffer[],u8 datasize)152 static int rds_cmd(struct snd_miro_aci *aci, u8 cmd, u8 databuffer[], u8 datasize)
153 {
154 int i, j;
155
156 rds_write(aci, cmd);
157
158 /* RDS_RESET doesn't need further processing */
159 if (cmd == RDS_RESET)
160 return 0;
161 if (rds_ack(aci))
162 return -EIO;
163 if (datasize == 0)
164 return 0;
165
166 /* to be able to use rds_readcycle_nowait()
167 I have to waitread() here */
168 if (rds_waitread(aci) < 0)
169 return -1;
170
171 memset(databuffer, 0, datasize);
172
173 for (i = 0; i < 8 * datasize; i++) {
174 j = rds_readcycle_nowait(aci);
175 if (j < 0)
176 return -EIO;
177 databuffer[i / 8] |= RDS_DATA(j) << (7 - (i % 8));
178 }
179 return 0;
180 }
181
pcm20_setfreq(struct pcm20 * dev,unsigned long freq)182 static int pcm20_setfreq(struct pcm20 *dev, unsigned long freq)
183 {
184 unsigned char freql;
185 unsigned char freqh;
186 struct snd_miro_aci *aci = dev->aci;
187
188 freq /= 160;
189 if (!(aci->aci_version == 0x07 || aci->aci_version >= 0xb0))
190 freq /= 10; /* I don't know exactly which version
191 * needs this hack */
192 freql = freq & 0xff;
193 freqh = freq >> 8;
194
195 rds_cmd(aci, RDS_RESET, NULL, 0);
196 return snd_aci_cmd(aci, ACI_WRITE_TUNE, freql, freqh);
197 }
198
vidioc_querycap(struct file * file,void * priv,struct v4l2_capability * v)199 static int vidioc_querycap(struct file *file, void *priv,
200 struct v4l2_capability *v)
201 {
202 strscpy(v->driver, "Miro PCM20", sizeof(v->driver));
203 strscpy(v->card, "Miro PCM20", sizeof(v->card));
204 strscpy(v->bus_info, "ISA:radio-miropcm20", sizeof(v->bus_info));
205 return 0;
206 }
207
sanitize(char * p,int size)208 static bool sanitize(char *p, int size)
209 {
210 int i;
211 bool ret = true;
212
213 for (i = 0; i < size; i++) {
214 if (p[i] < 32) {
215 p[i] = ' ';
216 ret = false;
217 }
218 }
219 return ret;
220 }
221
vidioc_g_tuner(struct file * file,void * priv,struct v4l2_tuner * v)222 static int vidioc_g_tuner(struct file *file, void *priv,
223 struct v4l2_tuner *v)
224 {
225 struct pcm20 *dev = video_drvdata(file);
226 int res;
227 u8 buf;
228
229 if (v->index)
230 return -EINVAL;
231 strscpy(v->name, "FM", sizeof(v->name));
232 v->type = V4L2_TUNER_RADIO;
233 v->rangelow = 87*16000;
234 v->rangehigh = 108*16000;
235 res = snd_aci_cmd(dev->aci, ACI_READ_TUNERSTATION, -1, -1);
236 v->signal = (res & 0x80) ? 0 : 0xffff;
237 /* Note: stereo detection does not work if the audio is muted,
238 it will default to mono in that case. */
239 res = snd_aci_cmd(dev->aci, ACI_READ_TUNERSTEREO, -1, -1);
240 v->rxsubchans = (res & 0x40) ? V4L2_TUNER_SUB_MONO :
241 V4L2_TUNER_SUB_STEREO;
242 v->capability = V4L2_TUNER_CAP_LOW | V4L2_TUNER_CAP_STEREO |
243 V4L2_TUNER_CAP_RDS | V4L2_TUNER_CAP_RDS_CONTROLS;
244 v->audmode = dev->audmode;
245 res = rds_cmd(dev->aci, RDS_RXVALUE, &buf, 1);
246 if (res >= 0 && buf)
247 v->rxsubchans |= V4L2_TUNER_SUB_RDS;
248 return 0;
249 }
250
vidioc_s_tuner(struct file * file,void * priv,const struct v4l2_tuner * v)251 static int vidioc_s_tuner(struct file *file, void *priv,
252 const struct v4l2_tuner *v)
253 {
254 struct pcm20 *dev = video_drvdata(file);
255
256 if (v->index)
257 return -EINVAL;
258 if (v->audmode > V4L2_TUNER_MODE_STEREO)
259 dev->audmode = V4L2_TUNER_MODE_STEREO;
260 else
261 dev->audmode = v->audmode;
262 snd_aci_cmd(dev->aci, ACI_SET_TUNERMONO,
263 dev->audmode == V4L2_TUNER_MODE_MONO, -1);
264 return 0;
265 }
266
vidioc_g_frequency(struct file * file,void * priv,struct v4l2_frequency * f)267 static int vidioc_g_frequency(struct file *file, void *priv,
268 struct v4l2_frequency *f)
269 {
270 struct pcm20 *dev = video_drvdata(file);
271
272 if (f->tuner != 0)
273 return -EINVAL;
274
275 f->type = V4L2_TUNER_RADIO;
276 f->frequency = dev->freq;
277 return 0;
278 }
279
280
vidioc_s_frequency(struct file * file,void * priv,const struct v4l2_frequency * f)281 static int vidioc_s_frequency(struct file *file, void *priv,
282 const struct v4l2_frequency *f)
283 {
284 struct pcm20 *dev = video_drvdata(file);
285
286 if (f->tuner != 0 || f->type != V4L2_TUNER_RADIO)
287 return -EINVAL;
288
289 dev->freq = clamp_t(u32, f->frequency, 87 * 16000U, 108 * 16000U);
290 pcm20_setfreq(dev, dev->freq);
291 return 0;
292 }
293
pcm20_s_ctrl(struct v4l2_ctrl * ctrl)294 static int pcm20_s_ctrl(struct v4l2_ctrl *ctrl)
295 {
296 struct pcm20 *dev = container_of(ctrl->handler, struct pcm20, ctrl_handler);
297
298 switch (ctrl->id) {
299 case V4L2_CID_AUDIO_MUTE:
300 snd_aci_cmd(dev->aci, ACI_SET_TUNERMUTE, ctrl->val, -1);
301 return 0;
302 }
303 return -EINVAL;
304 }
305
pcm20_thread(void * data)306 static int pcm20_thread(void *data)
307 {
308 struct pcm20 *dev = data;
309 const unsigned no_rds_start_counter = 5;
310 const unsigned sleep_msecs = 2000;
311 unsigned no_rds_counter = no_rds_start_counter;
312
313 for (;;) {
314 char text_buffer[66];
315 u8 buf;
316 int res;
317
318 msleep_interruptible(sleep_msecs);
319
320 if (kthread_should_stop())
321 break;
322
323 res = rds_cmd(dev->aci, RDS_RXVALUE, &buf, 1);
324 if (res)
325 continue;
326 if (buf == 0) {
327 if (no_rds_counter == 0)
328 continue;
329 no_rds_counter--;
330 if (no_rds_counter)
331 continue;
332
333 /*
334 * No RDS seen for no_rds_start_counter * sleep_msecs
335 * milliseconds, clear all RDS controls to their
336 * default values.
337 */
338 v4l2_ctrl_s_ctrl_string(dev->rds_ps_name, "");
339 v4l2_ctrl_s_ctrl(dev->rds_ms, 1);
340 v4l2_ctrl_s_ctrl(dev->rds_ta, 0);
341 v4l2_ctrl_s_ctrl(dev->rds_tp, 0);
342 v4l2_ctrl_s_ctrl(dev->rds_pty, 0);
343 v4l2_ctrl_s_ctrl_string(dev->rds_radio_test, "");
344 continue;
345 }
346 no_rds_counter = no_rds_start_counter;
347
348 res = rds_cmd(dev->aci, RDS_STATUS, &buf, 1);
349 if (res)
350 continue;
351 if ((buf >> 3) & 1) {
352 res = rds_cmd(dev->aci, RDS_STATIONNAME, text_buffer, 8);
353 text_buffer[8] = 0;
354 if (!res && sanitize(text_buffer, 8))
355 v4l2_ctrl_s_ctrl_string(dev->rds_ps_name, text_buffer);
356 }
357 if ((buf >> 6) & 1) {
358 u8 pty;
359
360 res = rds_cmd(dev->aci, RDS_PTYTATP, &pty, 1);
361 if (!res) {
362 v4l2_ctrl_s_ctrl(dev->rds_ms, !!(pty & 0x01));
363 v4l2_ctrl_s_ctrl(dev->rds_ta, !!(pty & 0x02));
364 v4l2_ctrl_s_ctrl(dev->rds_tp, !!(pty & 0x80));
365 v4l2_ctrl_s_ctrl(dev->rds_pty, (pty >> 2) & 0x1f);
366 }
367 }
368 if ((buf >> 4) & 1) {
369 res = rds_cmd(dev->aci, RDS_TEXT, text_buffer, 65);
370 text_buffer[65] = 0;
371 if (!res && sanitize(text_buffer + 1, 64))
372 v4l2_ctrl_s_ctrl_string(dev->rds_radio_test, text_buffer + 1);
373 }
374 }
375 return 0;
376 }
377
pcm20_open(struct file * file)378 static int pcm20_open(struct file *file)
379 {
380 struct pcm20 *dev = video_drvdata(file);
381 int res = v4l2_fh_open(file);
382
383 if (!res && v4l2_fh_is_singular_file(file) &&
384 IS_ERR_OR_NULL(dev->kthread)) {
385 dev->kthread = kthread_run(pcm20_thread, dev, "%s",
386 dev->v4l2_dev.name);
387 if (IS_ERR(dev->kthread)) {
388 v4l2_err(&dev->v4l2_dev, "kernel_thread() failed\n");
389 v4l2_fh_release(file);
390 return PTR_ERR(dev->kthread);
391 }
392 }
393 return res;
394 }
395
pcm20_release(struct file * file)396 static int pcm20_release(struct file *file)
397 {
398 struct pcm20 *dev = video_drvdata(file);
399
400 if (v4l2_fh_is_singular_file(file) && !IS_ERR_OR_NULL(dev->kthread)) {
401 kthread_stop(dev->kthread);
402 dev->kthread = NULL;
403 }
404 return v4l2_fh_release(file);
405 }
406
407 static const struct v4l2_file_operations pcm20_fops = {
408 .owner = THIS_MODULE,
409 .open = pcm20_open,
410 .poll = v4l2_ctrl_poll,
411 .release = pcm20_release,
412 .unlocked_ioctl = video_ioctl2,
413 };
414
415 static const struct v4l2_ioctl_ops pcm20_ioctl_ops = {
416 .vidioc_querycap = vidioc_querycap,
417 .vidioc_g_tuner = vidioc_g_tuner,
418 .vidioc_s_tuner = vidioc_s_tuner,
419 .vidioc_g_frequency = vidioc_g_frequency,
420 .vidioc_s_frequency = vidioc_s_frequency,
421 .vidioc_log_status = v4l2_ctrl_log_status,
422 .vidioc_subscribe_event = v4l2_ctrl_subscribe_event,
423 .vidioc_unsubscribe_event = v4l2_event_unsubscribe,
424 };
425
426 static const struct v4l2_ctrl_ops pcm20_ctrl_ops = {
427 .s_ctrl = pcm20_s_ctrl,
428 };
429
pcm20_init(void)430 static int __init pcm20_init(void)
431 {
432 struct pcm20 *dev = &pcm20_card;
433 struct v4l2_device *v4l2_dev = &dev->v4l2_dev;
434 struct v4l2_ctrl_handler *hdl;
435 int res;
436
437 dev->aci = snd_aci_get_aci();
438 if (dev->aci == NULL) {
439 v4l2_err(v4l2_dev,
440 "you must load the snd-miro driver first!\n");
441 return -ENODEV;
442 }
443 strscpy(v4l2_dev->name, "radio-miropcm20", sizeof(v4l2_dev->name));
444 mutex_init(&dev->lock);
445
446 res = v4l2_device_register(NULL, v4l2_dev);
447 if (res < 0) {
448 v4l2_err(v4l2_dev, "could not register v4l2_device\n");
449 return -EINVAL;
450 }
451
452 hdl = &dev->ctrl_handler;
453 v4l2_ctrl_handler_init(hdl, 7);
454 v4l2_ctrl_new_std(hdl, &pcm20_ctrl_ops,
455 V4L2_CID_AUDIO_MUTE, 0, 1, 1, 1);
456 dev->rds_pty = v4l2_ctrl_new_std(hdl, NULL,
457 V4L2_CID_RDS_RX_PTY, 0, 0x1f, 1, 0);
458 dev->rds_ps_name = v4l2_ctrl_new_std(hdl, NULL,
459 V4L2_CID_RDS_RX_PS_NAME, 0, 8, 8, 0);
460 dev->rds_radio_test = v4l2_ctrl_new_std(hdl, NULL,
461 V4L2_CID_RDS_RX_RADIO_TEXT, 0, 64, 64, 0);
462 dev->rds_ta = v4l2_ctrl_new_std(hdl, NULL,
463 V4L2_CID_RDS_RX_TRAFFIC_ANNOUNCEMENT, 0, 1, 1, 0);
464 dev->rds_tp = v4l2_ctrl_new_std(hdl, NULL,
465 V4L2_CID_RDS_RX_TRAFFIC_PROGRAM, 0, 1, 1, 0);
466 dev->rds_ms = v4l2_ctrl_new_std(hdl, NULL,
467 V4L2_CID_RDS_RX_MUSIC_SPEECH, 0, 1, 1, 1);
468 v4l2_dev->ctrl_handler = hdl;
469 if (hdl->error) {
470 res = hdl->error;
471 v4l2_err(v4l2_dev, "Could not register control\n");
472 goto err_hdl;
473 }
474 strscpy(dev->vdev.name, v4l2_dev->name, sizeof(dev->vdev.name));
475 dev->vdev.v4l2_dev = v4l2_dev;
476 dev->vdev.fops = &pcm20_fops;
477 dev->vdev.ioctl_ops = &pcm20_ioctl_ops;
478 dev->vdev.release = video_device_release_empty;
479 dev->vdev.lock = &dev->lock;
480 dev->vdev.device_caps = V4L2_CAP_TUNER | V4L2_CAP_RADIO |
481 V4L2_CAP_RDS_CAPTURE;
482 video_set_drvdata(&dev->vdev, dev);
483 snd_aci_cmd(dev->aci, ACI_SET_TUNERMONO,
484 dev->audmode == V4L2_TUNER_MODE_MONO, -1);
485 pcm20_setfreq(dev, dev->freq);
486
487 if (video_register_device(&dev->vdev, VFL_TYPE_RADIO, radio_nr) < 0)
488 goto err_hdl;
489
490 v4l2_info(v4l2_dev, "Mirosound PCM20 Radio tuner\n");
491 return 0;
492 err_hdl:
493 v4l2_ctrl_handler_free(hdl);
494 v4l2_device_unregister(v4l2_dev);
495 return -EINVAL;
496 }
497
498 MODULE_AUTHOR("Ruurd Reitsma, Krzysztof Helt");
499 MODULE_DESCRIPTION("A driver for the Miro PCM20 radio card.");
500 MODULE_LICENSE("GPL");
501
pcm20_cleanup(void)502 static void __exit pcm20_cleanup(void)
503 {
504 struct pcm20 *dev = &pcm20_card;
505
506 video_unregister_device(&dev->vdev);
507 snd_aci_cmd(dev->aci, ACI_SET_TUNERMUTE, 1, -1);
508 v4l2_ctrl_handler_free(&dev->ctrl_handler);
509 v4l2_device_unregister(&dev->v4l2_dev);
510 }
511
512 module_init(pcm20_init);
513 module_exit(pcm20_cleanup);
514