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[MIPS] RTLX: Protect rtlx_{read,write} with mutex.
[linux-2.6/linux-mips/linux-dm7025.git] / drivers / media / radio / radio-zoltrix.c
blobec08491fb7c54dc509c91d9249c771c4b62f7c15
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 zol_do_ioctl(struct inode *inode, struct file *file,
234 unsigned int cmd, void *arg)
235 {
236 struct video_device *dev = video_devdata(file);
237 struct zol_device *zol = dev->priv;
238
239 switch (cmd) {
240 case VIDIOC_QUERYCAP:
241 {
242 struct v4l2_capability *v = arg;
243 memset(v,0,sizeof(*v));
244 strlcpy(v->driver, "radio-zoltrix", sizeof (v->driver));
245 strlcpy(v->card, "Zoltrix Radio", sizeof (v->card));
246 sprintf(v->bus_info,"ISA");
247 v->version = RADIO_VERSION;
248 v->capabilities = V4L2_CAP_TUNER;
249
250 return 0;
251 }
252 case VIDIOC_G_TUNER:
253 {
254 struct v4l2_tuner *v = arg;
255
256 if (v->index > 0)
257 return -EINVAL;
258
259 memset(v,0,sizeof(*v));
260 strcpy(v->name, "FM");
261 v->type = V4L2_TUNER_RADIO;
262
263 v->rangelow=(88*16000);
264 v->rangehigh=(108*16000);
265 v->rxsubchans =V4L2_TUNER_SUB_MONO|V4L2_TUNER_SUB_STEREO;
266 v->capability=V4L2_TUNER_CAP_LOW;
267 if(zol_is_stereo(zol))
268 v->audmode = V4L2_TUNER_MODE_STEREO;
269 else
270 v->audmode = V4L2_TUNER_MODE_MONO;
271 v->signal=0xFFFF*zol_getsigstr(zol);
272
273 return 0;
274 }
275 case VIDIOC_S_TUNER:
276 {
277 struct v4l2_tuner *v = arg;
278
279 if (v->index > 0)
280 return -EINVAL;
281
282 return 0;
283 }
284 case VIDIOC_S_FREQUENCY:
285 {
286 struct v4l2_frequency *f = arg;
287
288 zol->curfreq = f->frequency;
289 zol_setfreq(zol, zol->curfreq);
290 return 0;
291 }
292 case VIDIOC_G_FREQUENCY:
293 {
294 struct v4l2_frequency *f = arg;
295
296 f->type = V4L2_TUNER_RADIO;
297 f->frequency = zol->curfreq;
298
299 return 0;
300 }
301 case VIDIOC_QUERYCTRL:
302 {
303 struct v4l2_queryctrl *qc = arg;
304 int i;
305
306 for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
307 if (qc->id && qc->id == radio_qctrl[i].id) {
308 memcpy(qc, &(radio_qctrl[i]),
309 sizeof(*qc));
310 return (0);
311 }
312 }
313 return -EINVAL;
314 }
315 case VIDIOC_G_CTRL:
316 {
317 struct v4l2_control *ctrl= arg;
318
319 switch (ctrl->id) {
320 case V4L2_CID_AUDIO_MUTE:
321 ctrl->value=zol->muted;
322 return (0);
323 case V4L2_CID_AUDIO_VOLUME:
324 ctrl->value=zol->curvol * 4096;
325 return (0);
326 }
327 return -EINVAL;
328 }
329 case VIDIOC_S_CTRL:
330 {
331 struct v4l2_control *ctrl= arg;
332
333 switch (ctrl->id) {
334 case V4L2_CID_AUDIO_MUTE:
335 if (ctrl->value) {
336 zol_mute(zol);
337 } else {
338 zol_unmute(zol);
339 zol_setvol(zol,zol->curvol);
340 }
341 return (0);
342 case V4L2_CID_AUDIO_VOLUME:
343 zol_setvol(zol,ctrl->value/4096);
344 return (0);
345 }
346 zol->stereo = 1;
347 zol_setfreq(zol, zol->curfreq);
348 #if 0
349 /* FIXME: Implement stereo/mono switch on V4L2 */
350 if (v->mode & VIDEO_SOUND_STEREO) {
351 zol->stereo = 1;
352 zol_setfreq(zol, zol->curfreq);
353 }
354 if (v->mode & VIDEO_SOUND_MONO) {
355 zol->stereo = 0;
356 zol_setfreq(zol, zol->curfreq);
357 }
358 #endif
359 return -EINVAL;
360 }
361
362 default:
363 return v4l_compat_translate_ioctl(inode,file,cmd,arg,
364 zol_do_ioctl);
365 }
366 }
367
368 static int zol_ioctl(struct inode *inode, struct file *file,
369 unsigned int cmd, unsigned long arg)
370 {
371 return video_usercopy(inode, file, cmd, arg, zol_do_ioctl);
372 }
373
374 static struct zol_device zoltrix_unit;
375
376 static const struct file_operations zoltrix_fops =
377 {
378 .owner = THIS_MODULE,
379 .open = video_exclusive_open,
380 .release = video_exclusive_release,
381 .ioctl = zol_ioctl,
382 .compat_ioctl = v4l_compat_ioctl32,
383 .llseek = no_llseek,
384 };
385
386 static struct video_device zoltrix_radio =
387 {
388 .owner = THIS_MODULE,
389 .name = "Zoltrix Radio Plus",
390 .type = VID_TYPE_TUNER,
391 .hardware = 0,
392 .fops = &zoltrix_fops,
393 };
394
395 static int __init zoltrix_init(void)
396 {
397 if (io == -1) {
398 printk(KERN_ERR "You must set an I/O address with io=0x???\n");
399 return -EINVAL;
400 }
401 if ((io != 0x20c) && (io != 0x30c)) {
402 printk(KERN_ERR "zoltrix: invalid port, try 0x20c or 0x30c\n");
403 return -ENXIO;
404 }
405
406 zoltrix_radio.priv = &zoltrix_unit;
407 if (!request_region(io, 2, "zoltrix")) {
408 printk(KERN_ERR "zoltrix: port 0x%x already in use\n", io);
409 return -EBUSY;
410 }
411
412 if (video_register_device(&zoltrix_radio, VFL_TYPE_RADIO, radio_nr) == -1)
413 {
414 release_region(io, 2);
415 return -EINVAL;
416 }
417 printk(KERN_INFO "Zoltrix Radio Plus card driver.\n");
418
419 mutex_init(&zoltrix_unit.lock);
420
421 /* mute card - prevents noisy bootups */
422
423 /* this ensures that the volume is all the way down */
424
425 outb(0, io);
426 outb(0, io);
427 msleep(20);
428 inb(io + 3);
429
430 zoltrix_unit.curvol = 0;
431 zoltrix_unit.stereo = 1;
432
433 return 0;
434 }
435
436 MODULE_AUTHOR("C.van Schaik");
437 MODULE_DESCRIPTION("A driver for the Zoltrix Radio Plus.");
438 MODULE_LICENSE("GPL");
439
440 module_param(io, int, 0);
441 MODULE_PARM_DESC(io, "I/O address of the Zoltrix Radio Plus (0x20c or 0x30c)");
442 module_param(radio_nr, int, 0);
443
444 static void __exit zoltrix_cleanup_module(void)
445 {
446 video_unregister_device(&zoltrix_radio);
447 release_region(io, 2);
448 }
449
450 module_init(zoltrix_init);
451 module_exit(zoltrix_cleanup_module);
452
A Kernel for the Dreambox dm7025.