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mm/slab.c: proper prototypes
[wrt350n-kernel.git] / drivers / media / radio / radio-zoltrix.c
bloba4715901512d48cf4c93ba5aa477d4536e6e0f24
1 /* zoltrix radio plus driver for Linux radio support
2 * (c) 1998 C. van Schaik <carl@leg.uct.ac.za>
3 *
4 * BUGS
5 * Due to the inconsistency in reading from the signal flags
6 * it is difficult to get an accurate tuned signal.
7 *
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.
11 *
12 * Some code derived from code by Romolo Manfredini
13 * romolo@bicnet.it
14 *
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
27 *
28 * 2006-07-24 - Converted to V4L2 API
29 * by Mauro Carvalho Chehab <mchehab@infradead.org>
30 */
31
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
41 #include <linux/version.h> /* for KERNEL_VERSION MACRO */
42 #define RADIO_VERSION KERNEL_VERSION(0,0,2)
43
44 static struct v4l2_queryctrl radio_qctrl[] = {
45 {
46 .id = V4L2_CID_AUDIO_MUTE,
47 .name = "Mute",
48 .minimum = 0,
49 .maximum = 1,
50 .default_value = 1,
51 .type = V4L2_CTRL_TYPE_BOOLEAN,
52 },{
53 .id = V4L2_CID_AUDIO_VOLUME,
54 .name = "Volume",
55 .minimum = 0,
56 .maximum = 65535,
57 .step = 4096,
58 .default_value = 0xff,
59 .type = V4L2_CTRL_TYPE_INTEGER,
60 }
61 };
62
63 #ifndef CONFIG_RADIO_ZOLTRIX_PORT
64 #define CONFIG_RADIO_ZOLTRIX_PORT -1
65 #endif
66
67 static int io = CONFIG_RADIO_ZOLTRIX_PORT;
68 static int radio_nr = -1;
69
70 struct zol_device {
71 int port;
72 int curvol;
73 unsigned long curfreq;
74 int muted;
75 unsigned int stereo;
76 struct mutex lock;
77 };
78
79 static int zol_setvol(struct zol_device *dev, int vol)
80 {
81 dev->curvol = vol;
82 if (dev->muted)
83 return 0;
84
85 mutex_lock(&dev->lock);
86 if (vol == 0) {
87 outb(0, io);
88 outb(0, io);
89 inb(io + 3); /* Zoltrix needs to be read to confirm */
90 mutex_unlock(&dev->lock);
91 return 0;
92 }
93
94 outb(dev->curvol-1, io);
95 msleep(10);
96 inb(io + 2);
97 mutex_unlock(&dev->lock);
98 return 0;
99 }
100
101 static void zol_mute(struct zol_device *dev)
102 {
103 dev->muted = 1;
104 mutex_lock(&dev->lock);
105 outb(0, io);
106 outb(0, io);
107 inb(io + 3); /* Zoltrix needs to be read to confirm */
108 mutex_unlock(&dev->lock);
109 }
110
111 static void zol_unmute(struct zol_device *dev)
112 {
113 dev->muted = 0;
114 zol_setvol(dev, dev->curvol);
115 }
116
117 static int zol_setfreq(struct zol_device *dev, unsigned long freq)
118 {
119 /* tunes the radio to the desired frequency */
120 unsigned long long bitmask, f, m;
121 unsigned int stereo = dev->stereo;
122 int i;
123
124 if (freq == 0)
125 return 1;
126 m = (freq / 160 - 8800) * 2;
127 f = (unsigned long long) m + 0x4d1c;
128
129 bitmask = 0xc480402c10080000ull;
130 i = 45;
131
132 mutex_lock(&dev->lock);
133
134 outb(0, io);
135 outb(0, io);
136 inb(io + 3); /* Zoltrix needs to be read to confirm */
137
138 outb(0x40, io);
139 outb(0xc0, io);
140
141 bitmask = (bitmask ^ ((f & 0xff) << 47) ^ ((f & 0xff00) << 30) ^ ( stereo << 31));
142 while (i--) {
143 if ((bitmask & 0x8000000000000000ull) != 0) {
144 outb(0x80, io);
145 udelay(50);
146 outb(0x00, io);
147 udelay(50);
148 outb(0x80, io);
149 udelay(50);
150 } else {
151 outb(0xc0, io);
152 udelay(50);
153 outb(0x40, io);
154 udelay(50);
155 outb(0xc0, io);
156 udelay(50);
157 }
158 bitmask *= 2;
159 }
160 /* termination sequence */
161 outb(0x80, io);
162 outb(0xc0, io);
163 outb(0x40, io);
164 udelay(1000);
165 inb(io+2);
166
167 udelay(1000);
168
169 if (dev->muted)
170 {
171 outb(0, io);
172 outb(0, io);
173 inb(io + 3);
174 udelay(1000);
175 }
176
177 mutex_unlock(&dev->lock);
178
179 if(!dev->muted)
180 {
181 zol_setvol(dev, dev->curvol);
182 }
183 return 0;
184 }
185
186 /* Get signal strength */
187
188 static int zol_getsigstr(struct zol_device *dev)
189 {
190 int a, b;
191
192 mutex_lock(&dev->lock);
193 outb(0x00, io); /* This stuff I found to do nothing */
194 outb(dev->curvol, io);
195 msleep(20);
196
197 a = inb(io);
198 msleep(10);
199 b = inb(io);
200
201 mutex_unlock(&dev->lock);
202
203 if (a != b)
204 return (0);
205
206 if ((a == 0xcf) || (a == 0xdf) /* I found this out by playing */
207 || (a == 0xef)) /* with a binary scanner on the card io */
208 return (1);
209 return (0);
210 }
211
212 static int zol_is_stereo (struct zol_device *dev)
213 {
214 int x1, x2;
215
216 mutex_lock(&dev->lock);
217
218 outb(0x00, io);
219 outb(dev->curvol, io);
220 msleep(20);
221
222 x1 = inb(io);
223 msleep(10);
224 x2 = inb(io);
225
226 mutex_unlock(&dev->lock);
227
228 if ((x1 == x2) && (x1 == 0xcf))
229 return 1;
230 return 0;
231 }
232
233 static int vidioc_querycap(struct file *file, void *priv,
234 struct v4l2_capability *v)
235 {
236 strlcpy(v->driver, "radio-zoltrix", sizeof(v->driver));
237 strlcpy(v->card, "Zoltrix Radio", sizeof(v->card));
238 sprintf(v->bus_info, "ISA");
239 v->version = RADIO_VERSION;
240 v->capabilities = V4L2_CAP_TUNER;
241 return 0;
242 }
243
244 static int vidioc_g_tuner(struct file *file, void *priv,
245 struct v4l2_tuner *v)
246 {
247 struct video_device *dev = video_devdata(file);
248 struct zol_device *zol = dev->priv;
249
250 if (v->index > 0)
251 return -EINVAL;
252
253 strcpy(v->name, "FM");
254 v->type = V4L2_TUNER_RADIO;
255 v->rangelow = (88*16000);
256 v->rangehigh = (108*16000);
257 v->rxsubchans = V4L2_TUNER_SUB_MONO|V4L2_TUNER_SUB_STEREO;
258 v->capability = V4L2_TUNER_CAP_LOW;
259 if (zol_is_stereo(zol))
260 v->audmode = V4L2_TUNER_MODE_STEREO;
261 else
262 v->audmode = V4L2_TUNER_MODE_MONO;
263 v->signal = 0xFFFF*zol_getsigstr(zol);
264 return 0;
265 }
266
267 static int vidioc_s_tuner(struct file *file, void *priv,
268 struct v4l2_tuner *v)
269 {
270 if (v->index > 0)
271 return -EINVAL;
272 return 0;
273 }
274
275 static int vidioc_s_frequency(struct file *file, void *priv,
276 struct v4l2_frequency *f)
277 {
278 struct video_device *dev = video_devdata(file);
279 struct zol_device *zol = dev->priv;
280
281 zol->curfreq = f->frequency;
282 zol_setfreq(zol, zol->curfreq);
283 return 0;
284 }
285
286 static int vidioc_g_frequency(struct file *file, void *priv,
287 struct v4l2_frequency *f)
288 {
289 struct video_device *dev = video_devdata(file);
290 struct zol_device *zol = dev->priv;
291
292 f->type = V4L2_TUNER_RADIO;
293 f->frequency = zol->curfreq;
294 return 0;
295 }
296
297 static int vidioc_queryctrl(struct file *file, void *priv,
298 struct v4l2_queryctrl *qc)
299 {
300 int i;
301
302 for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
303 if (qc->id && qc->id == radio_qctrl[i].id) {
304 memcpy(qc, &(radio_qctrl[i]),
305 sizeof(*qc));
306 return 0;
307 }
308 }
309 return -EINVAL;
310 }
311
312 static int vidioc_g_ctrl(struct file *file, void *priv,
313 struct v4l2_control *ctrl)
314 {
315 struct video_device *dev = video_devdata(file);
316 struct zol_device *zol = dev->priv;
317
318 switch (ctrl->id) {
319 case V4L2_CID_AUDIO_MUTE:
320 ctrl->value = zol->muted;
321 return 0;
322 case V4L2_CID_AUDIO_VOLUME:
323 ctrl->value = zol->curvol * 4096;
324 return 0;
325 }
326 return -EINVAL;
327 }
328
329 static int vidioc_s_ctrl(struct file *file, void *priv,
330 struct v4l2_control *ctrl)
331 {
332 struct video_device *dev = video_devdata(file);
333 struct zol_device *zol = dev->priv;
334
335 switch (ctrl->id) {
336 case V4L2_CID_AUDIO_MUTE:
337 if (ctrl->value)
338 zol_mute(zol);
339 else {
340 zol_unmute(zol);
341 zol_setvol(zol,zol->curvol);
342 }
343 return 0;
344 case V4L2_CID_AUDIO_VOLUME:
345 zol_setvol(zol,ctrl->value/4096);
346 return 0;
347 }
348 zol->stereo = 1;
349 zol_setfreq(zol, zol->curfreq);
350 #if 0
351 /* FIXME: Implement stereo/mono switch on V4L2 */
352 if (v->mode & VIDEO_SOUND_STEREO) {
353 zol->stereo = 1;
354 zol_setfreq(zol, zol->curfreq);
355 }
356 if (v->mode & VIDEO_SOUND_MONO) {
357 zol->stereo = 0;
358 zol_setfreq(zol, zol->curfreq);
359 }
360 #endif
361 return -EINVAL;
362 }
363
364 static int vidioc_g_audio(struct file *file, void *priv,
365 struct v4l2_audio *a)
366 {
367 if (a->index > 1)
368 return -EINVAL;
369
370 strcpy(a->name, "Radio");
371 a->capability = V4L2_AUDCAP_STEREO;
372 return 0;
373 }
374
375 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
376 {
377 *i = 0;
378 return 0;
379 }
380
381 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
382 {
383 if (i != 0)
384 return -EINVAL;
385 return 0;
386 }
387
388 static int vidioc_s_audio(struct file *file, void *priv,
389 struct v4l2_audio *a)
390 {
391 if (a->index != 0)
392 return -EINVAL;
393 return 0;
394 }
395
396 static struct zol_device zoltrix_unit;
397
398 static const struct file_operations zoltrix_fops =
399 {
400 .owner = THIS_MODULE,
401 .open = video_exclusive_open,
402 .release = video_exclusive_release,
403 .ioctl = video_ioctl2,
404 .compat_ioctl = v4l_compat_ioctl32,
405 .llseek = no_llseek,
406 };
407
408 static struct video_device zoltrix_radio =
409 {
410 .owner = THIS_MODULE,
411 .name = "Zoltrix Radio Plus",
412 .type = VID_TYPE_TUNER,
413 .hardware = 0,
414 .fops = &zoltrix_fops,
415 .vidioc_querycap = vidioc_querycap,
416 .vidioc_g_tuner = vidioc_g_tuner,
417 .vidioc_s_tuner = vidioc_s_tuner,
418 .vidioc_g_audio = vidioc_g_audio,
419 .vidioc_s_audio = vidioc_s_audio,
420 .vidioc_g_input = vidioc_g_input,
421 .vidioc_s_input = vidioc_s_input,
422 .vidioc_g_frequency = vidioc_g_frequency,
423 .vidioc_s_frequency = vidioc_s_frequency,
424 .vidioc_queryctrl = vidioc_queryctrl,
425 .vidioc_g_ctrl = vidioc_g_ctrl,
426 .vidioc_s_ctrl = vidioc_s_ctrl,
427 };
428
429 static int __init zoltrix_init(void)
430 {
431 if (io == -1) {
432 printk(KERN_ERR "You must set an I/O address with io=0x???\n");
433 return -EINVAL;
434 }
435 if ((io != 0x20c) && (io != 0x30c)) {
436 printk(KERN_ERR "zoltrix: invalid port, try 0x20c or 0x30c\n");
437 return -ENXIO;
438 }
439
440 zoltrix_radio.priv = &zoltrix_unit;
441 if (!request_region(io, 2, "zoltrix")) {
442 printk(KERN_ERR "zoltrix: port 0x%x already in use\n", io);
443 return -EBUSY;
444 }
445
446 if (video_register_device(&zoltrix_radio, VFL_TYPE_RADIO, radio_nr) == -1)
447 {
448 release_region(io, 2);
449 return -EINVAL;
450 }
451 printk(KERN_INFO "Zoltrix Radio Plus card driver.\n");
452
453 mutex_init(&zoltrix_unit.lock);
454
455 /* mute card - prevents noisy bootups */
456
457 /* this ensures that the volume is all the way down */
458
459 outb(0, io);
460 outb(0, io);
461 msleep(20);
462 inb(io + 3);
463
464 zoltrix_unit.curvol = 0;
465 zoltrix_unit.stereo = 1;
466
467 return 0;
468 }
469
470 MODULE_AUTHOR("C.van Schaik");
471 MODULE_DESCRIPTION("A driver for the Zoltrix Radio Plus.");
472 MODULE_LICENSE("GPL");
473
474 module_param(io, int, 0);
475 MODULE_PARM_DESC(io, "I/O address of the Zoltrix Radio Plus (0x20c or 0x30c)");
476 module_param(radio_nr, int, 0);
477
478 static void __exit zoltrix_cleanup_module(void)
479 {
480 video_unregister_device(&zoltrix_radio);
481 release_region(io, 2);
482 }
483
484 module_init(zoltrix_init);
485 module_exit(zoltrix_cleanup_module);
486
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