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VFS: fix unused variable warning
[linux/fpc-iii.git] / drivers / media / radio / radio-typhoon.c
blob18f2abd7e2552e985d670551b1abc729c0d24d5f
1 /* Typhoon Radio Card driver for radio support
2 * (c) 1999 Dr. Henrik Seidel <Henrik.Seidel@gmx.de>
3 *
4 * Card manufacturer:
5 * http://194.18.155.92/idc/prod2.idc?nr=50753&lang=e
6 *
7 * Notes on the hardware
8 *
9 * This card has two output sockets, one for speakers and one for line.
10 * The speaker output has volume control, but only in four discrete
11 * steps. The line output has neither volume control nor mute.
12 *
13 * The card has auto-stereo according to its manual, although it all
14 * sounds mono to me (even with the Win/DOS drivers). Maybe it's my
15 * antenna - I really don't know for sure.
16 *
17 * Frequency control is done digitally.
18 *
19 * Volume control is done digitally, but there are only four different
20 * possible values. So you should better always turn the volume up and
21 * use line control. I got the best results by connecting line output
22 * to the sound card microphone input. For such a configuration the
23 * volume control has no effect, since volume control only influences
24 * the speaker output.
25 *
26 * There is no explicit mute/unmute. So I set the radio frequency to a
27 * value where I do expect just noise and turn the speaker volume down.
28 * The frequency change is necessary since the card never seems to be
29 * completely silent.
30 *
31 * Converted to V4L2 API by Mauro Carvalho Chehab <mchehab@infradead.org>
32 */
33
34 #include <linux/module.h> /* Modules */
35 #include <linux/init.h> /* Initdata */
36 #include <linux/ioport.h> /* request_region */
37 #include <linux/proc_fs.h> /* radio card status report */
38 #include <linux/seq_file.h>
39 #include <asm/io.h> /* outb, outb_p */
40 #include <asm/uaccess.h> /* copy to/from user */
41 #include <linux/videodev2.h> /* kernel radio structs */
42 #include <media/v4l2-common.h>
43
44 #include <linux/version.h> /* for KERNEL_VERSION MACRO */
45 #define RADIO_VERSION KERNEL_VERSION(0,1,1)
46 #define BANNER "Typhoon Radio Card driver v0.1.1\n"
47
48 static struct v4l2_queryctrl radio_qctrl[] = {
49 {
50 .id = V4L2_CID_AUDIO_MUTE,
51 .name = "Mute",
52 .minimum = 0,
53 .maximum = 1,
54 .default_value = 1,
55 .type = V4L2_CTRL_TYPE_BOOLEAN,
56 },{
57 .id = V4L2_CID_AUDIO_VOLUME,
58 .name = "Volume",
59 .minimum = 0,
60 .maximum = 65535,
61 .step = 1<<14,
62 .default_value = 0xff,
63 .type = V4L2_CTRL_TYPE_INTEGER,
64 }
65 };
66
67
68 #ifndef CONFIG_RADIO_TYPHOON_PORT
69 #define CONFIG_RADIO_TYPHOON_PORT -1
70 #endif
71
72 #ifndef CONFIG_RADIO_TYPHOON_MUTEFREQ
73 #define CONFIG_RADIO_TYPHOON_MUTEFREQ 0
74 #endif
75
76 #ifndef CONFIG_PROC_FS
77 #undef CONFIG_RADIO_TYPHOON_PROC_FS
78 #endif
79
80 struct typhoon_device {
81 int users;
82 int iobase;
83 int curvol;
84 int muted;
85 unsigned long curfreq;
86 unsigned long mutefreq;
87 struct mutex lock;
88 };
89
90 static void typhoon_setvol_generic(struct typhoon_device *dev, int vol);
91 static int typhoon_setfreq_generic(struct typhoon_device *dev,
92 unsigned long frequency);
93 static int typhoon_setfreq(struct typhoon_device *dev, unsigned long frequency);
94 static void typhoon_mute(struct typhoon_device *dev);
95 static void typhoon_unmute(struct typhoon_device *dev);
96 static int typhoon_setvol(struct typhoon_device *dev, int vol);
97
98 static void typhoon_setvol_generic(struct typhoon_device *dev, int vol)
99 {
100 mutex_lock(&dev->lock);
101 vol >>= 14; /* Map 16 bit to 2 bit */
102 vol &= 3;
103 outb_p(vol / 2, dev->iobase); /* Set the volume, high bit. */
104 outb_p(vol % 2, dev->iobase + 2); /* Set the volume, low bit. */
105 mutex_unlock(&dev->lock);
106 }
107
108 static int typhoon_setfreq_generic(struct typhoon_device *dev,
109 unsigned long frequency)
110 {
111 unsigned long outval;
112 unsigned long x;
113
114 /*
115 * The frequency transfer curve is not linear. The best fit I could
116 * get is
117 *
118 * outval = -155 + exp((f + 15.55) * 0.057))
119 *
120 * where frequency f is in MHz. Since we don't have exp in the kernel,
121 * I approximate this function by a third order polynomial.
122 *
123 */
124
125 mutex_lock(&dev->lock);
126 x = frequency / 160;
127 outval = (x * x + 2500) / 5000;
128 outval = (outval * x + 5000) / 10000;
129 outval -= (10 * x * x + 10433) / 20866;
130 outval += 4 * x - 11505;
131
132 outb_p((outval >> 8) & 0x01, dev->iobase + 4);
133 outb_p(outval >> 9, dev->iobase + 6);
134 outb_p(outval & 0xff, dev->iobase + 8);
135 mutex_unlock(&dev->lock);
136
137 return 0;
138 }
139
140 static int typhoon_setfreq(struct typhoon_device *dev, unsigned long frequency)
141 {
142 typhoon_setfreq_generic(dev, frequency);
143 dev->curfreq = frequency;
144 return 0;
145 }
146
147 static void typhoon_mute(struct typhoon_device *dev)
148 {
149 if (dev->muted == 1)
150 return;
151 typhoon_setvol_generic(dev, 0);
152 typhoon_setfreq_generic(dev, dev->mutefreq);
153 dev->muted = 1;
154 }
155
156 static void typhoon_unmute(struct typhoon_device *dev)
157 {
158 if (dev->muted == 0)
159 return;
160 typhoon_setfreq_generic(dev, dev->curfreq);
161 typhoon_setvol_generic(dev, dev->curvol);
162 dev->muted = 0;
163 }
164
165 static int typhoon_setvol(struct typhoon_device *dev, int vol)
166 {
167 if (dev->muted && vol != 0) { /* user is unmuting the card */
168 dev->curvol = vol;
169 typhoon_unmute(dev);
170 return 0;
171 }
172 if (vol == dev->curvol) /* requested volume == current */
173 return 0;
174
175 if (vol == 0) { /* volume == 0 means mute the card */
176 typhoon_mute(dev);
177 dev->curvol = vol;
178 return 0;
179 }
180 typhoon_setvol_generic(dev, vol);
181 dev->curvol = vol;
182 return 0;
183 }
184
185 static int vidioc_querycap(struct file *file, void *priv,
186 struct v4l2_capability *v)
187 {
188 strlcpy(v->driver, "radio-typhoon", sizeof(v->driver));
189 strlcpy(v->card, "Typhoon Radio", sizeof(v->card));
190 sprintf(v->bus_info, "ISA");
191 v->version = RADIO_VERSION;
192 v->capabilities = V4L2_CAP_TUNER;
193 return 0;
194 }
195
196 static int vidioc_g_tuner(struct file *file, void *priv,
197 struct v4l2_tuner *v)
198 {
199 if (v->index > 0)
200 return -EINVAL;
201
202 strcpy(v->name, "FM");
203 v->type = V4L2_TUNER_RADIO;
204 v->rangelow = (87.5*16000);
205 v->rangehigh = (108*16000);
206 v->rxsubchans = V4L2_TUNER_SUB_MONO;
207 v->capability = V4L2_TUNER_CAP_LOW;
208 v->audmode = V4L2_TUNER_MODE_MONO;
209 v->signal = 0xFFFF; /* We can't get the signal strength */
210 return 0;
211 }
212
213 static int vidioc_s_tuner(struct file *file, void *priv,
214 struct v4l2_tuner *v)
215 {
216 if (v->index > 0)
217 return -EINVAL;
218
219 return 0;
220 }
221
222 static int vidioc_s_frequency(struct file *file, void *priv,
223 struct v4l2_frequency *f)
224 {
225 struct video_device *dev = video_devdata(file);
226 struct typhoon_device *typhoon = dev->priv;
227
228 typhoon->curfreq = f->frequency;
229 typhoon_setfreq(typhoon, typhoon->curfreq);
230 return 0;
231 }
232
233 static int vidioc_g_frequency(struct file *file, void *priv,
234 struct v4l2_frequency *f)
235 {
236 struct video_device *dev = video_devdata(file);
237 struct typhoon_device *typhoon = dev->priv;
238
239 f->type = V4L2_TUNER_RADIO;
240 f->frequency = typhoon->curfreq;
241
242 return 0;
243 }
244
245 static int vidioc_queryctrl(struct file *file, void *priv,
246 struct v4l2_queryctrl *qc)
247 {
248 int i;
249
250 for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
251 if (qc->id && qc->id == radio_qctrl[i].id) {
252 memcpy(qc, &(radio_qctrl[i]),
253 sizeof(*qc));
254 return 0;
255 }
256 }
257 return -EINVAL;
258 }
259
260 static int vidioc_g_ctrl(struct file *file, void *priv,
261 struct v4l2_control *ctrl)
262 {
263 struct video_device *dev = video_devdata(file);
264 struct typhoon_device *typhoon = dev->priv;
265
266 switch (ctrl->id) {
267 case V4L2_CID_AUDIO_MUTE:
268 ctrl->value = typhoon->muted;
269 return 0;
270 case V4L2_CID_AUDIO_VOLUME:
271 ctrl->value = typhoon->curvol;
272 return 0;
273 }
274 return -EINVAL;
275 }
276
277 static int vidioc_s_ctrl (struct file *file, void *priv,
278 struct v4l2_control *ctrl)
279 {
280 struct video_device *dev = video_devdata(file);
281 struct typhoon_device *typhoon = dev->priv;
282
283 switch (ctrl->id) {
284 case V4L2_CID_AUDIO_MUTE:
285 if (ctrl->value)
286 typhoon_mute(typhoon);
287 else
288 typhoon_unmute(typhoon);
289 return 0;
290 case V4L2_CID_AUDIO_VOLUME:
291 typhoon_setvol(typhoon, ctrl->value);
292 return 0;
293 }
294 return -EINVAL;
295 }
296
297 static int vidioc_g_audio(struct file *file, void *priv,
298 struct v4l2_audio *a)
299 {
300 if (a->index > 1)
301 return -EINVAL;
302
303 strcpy(a->name, "Radio");
304 a->capability = V4L2_AUDCAP_STEREO;
305 return 0;
306 }
307
308 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
309 {
310 *i = 0;
311 return 0;
312 }
313
314 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
315 {
316 if (i != 0)
317 return -EINVAL;
318 return 0;
319 }
320
321 static int vidioc_s_audio(struct file *file, void *priv,
322 struct v4l2_audio *a)
323 {
324 if (a->index != 0)
325 return -EINVAL;
326 return 0;
327 }
328
329 static struct typhoon_device typhoon_unit =
330 {
331 .iobase = CONFIG_RADIO_TYPHOON_PORT,
332 .curfreq = CONFIG_RADIO_TYPHOON_MUTEFREQ,
333 .mutefreq = CONFIG_RADIO_TYPHOON_MUTEFREQ,
334 };
335
336 static const struct file_operations typhoon_fops = {
337 .owner = THIS_MODULE,
338 .open = video_exclusive_open,
339 .release = video_exclusive_release,
340 .ioctl = video_ioctl2,
341 #ifdef CONFIG_COMPAT
342 .compat_ioctl = v4l_compat_ioctl32,
343 #endif
344 .llseek = no_llseek,
345 };
346
347 static struct video_device typhoon_radio =
348 {
349 .owner = THIS_MODULE,
350 .name = "Typhoon Radio",
351 .type = VID_TYPE_TUNER,
352 .fops = &typhoon_fops,
353 .vidioc_querycap = vidioc_querycap,
354 .vidioc_g_tuner = vidioc_g_tuner,
355 .vidioc_s_tuner = vidioc_s_tuner,
356 .vidioc_g_audio = vidioc_g_audio,
357 .vidioc_s_audio = vidioc_s_audio,
358 .vidioc_g_input = vidioc_g_input,
359 .vidioc_s_input = vidioc_s_input,
360 .vidioc_g_frequency = vidioc_g_frequency,
361 .vidioc_s_frequency = vidioc_s_frequency,
362 .vidioc_queryctrl = vidioc_queryctrl,
363 .vidioc_g_ctrl = vidioc_g_ctrl,
364 .vidioc_s_ctrl = vidioc_s_ctrl,
365 };
366
367 #ifdef CONFIG_RADIO_TYPHOON_PROC_FS
368
369 static int typhoon_proc_show(struct seq_file *m, void *v)
370 {
371 #ifdef MODULE
372 #define MODULEPROCSTRING "Driver loaded as a module"
373 #else
374 #define MODULEPROCSTRING "Driver compiled into kernel"
375 #endif
376
377 seq_puts(m, BANNER);
378 seq_puts(m, "Load type: " MODULEPROCSTRING "\n\n");
379 seq_printf(m, "frequency = %lu kHz\n",
380 typhoon_unit.curfreq >> 4);
381 seq_printf(m, "volume = %d\n", typhoon_unit.curvol);
382 seq_printf(m, "mute = %s\n", typhoon_unit.muted ?
383 "on" : "off");
384 seq_printf(m, "iobase = 0x%x\n", typhoon_unit.iobase);
385 seq_printf(m, "mute frequency = %lu kHz\n",
386 typhoon_unit.mutefreq >> 4);
387 return 0;
388 }
389
390 static int typhoon_proc_open(struct inode *inode, struct file *file)
391 {
392 return single_open(file, typhoon_proc_show, NULL);
393 }
394
395 static const struct file_operations typhoon_proc_fops = {
396 .owner = THIS_MODULE,
397 .open = typhoon_proc_open,
398 .read = seq_read,
399 .llseek = seq_lseek,
400 .release = single_release,
401 };
402 #endif /* CONFIG_RADIO_TYPHOON_PROC_FS */
403
404 MODULE_AUTHOR("Dr. Henrik Seidel");
405 MODULE_DESCRIPTION("A driver for the Typhoon radio card (a.k.a. EcoRadio).");
406 MODULE_LICENSE("GPL");
407
408 static int io = -1;
409 static int radio_nr = -1;
410
411 module_param(io, int, 0);
412 MODULE_PARM_DESC(io, "I/O address of the Typhoon card (0x316 or 0x336)");
413 module_param(radio_nr, int, 0);
414
415 #ifdef MODULE
416 static unsigned long mutefreq;
417 module_param(mutefreq, ulong, 0);
418 MODULE_PARM_DESC(mutefreq, "Frequency used when muting the card (in kHz)");
419 #endif
420
421 static int __init typhoon_init(void)
422 {
423 #ifdef MODULE
424 if (io == -1) {
425 printk(KERN_ERR "radio-typhoon: You must set an I/O address with io=0x316 or io=0x336\n");
426 return -EINVAL;
427 }
428 typhoon_unit.iobase = io;
429
430 if (mutefreq < 87000 || mutefreq > 108500) {
431 printk(KERN_ERR "radio-typhoon: You must set a frequency (in kHz) used when muting the card,\n");
432 printk(KERN_ERR "radio-typhoon: e.g. with \"mutefreq=87500\" (87000 <= mutefreq <= 108500)\n");
433 return -EINVAL;
434 }
435 typhoon_unit.mutefreq = mutefreq;
436 #endif /* MODULE */
437
438 printk(KERN_INFO BANNER);
439 mutex_init(&typhoon_unit.lock);
440 io = typhoon_unit.iobase;
441 if (!request_region(io, 8, "typhoon")) {
442 printk(KERN_ERR "radio-typhoon: port 0x%x already in use\n",
443 typhoon_unit.iobase);
444 return -EBUSY;
445 }
446
447 typhoon_radio.priv = &typhoon_unit;
448 if (video_register_device(&typhoon_radio, VFL_TYPE_RADIO, radio_nr) == -1)
449 {
450 release_region(io, 8);
451 return -EINVAL;
452 }
453 printk(KERN_INFO "radio-typhoon: port 0x%x.\n", typhoon_unit.iobase);
454 printk(KERN_INFO "radio-typhoon: mute frequency is %lu kHz.\n",
455 typhoon_unit.mutefreq);
456 typhoon_unit.mutefreq <<= 4;
457
458 /* mute card - prevents noisy bootups */
459 typhoon_mute(&typhoon_unit);
460
461 #ifdef CONFIG_RADIO_TYPHOON_PROC_FS
462 if (!proc_create("driver/radio-typhoon", 0, NULL, &typhoon_proc_fops))
463 printk(KERN_ERR "radio-typhoon: registering /proc/driver/radio-typhoon failed\n");
464 #endif
465
466 return 0;
467 }
468
469 static void __exit typhoon_cleanup_module(void)
470 {
471
472 #ifdef CONFIG_RADIO_TYPHOON_PROC_FS
473 remove_proc_entry("driver/radio-typhoon", NULL);
474 #endif
475
476 video_unregister_device(&typhoon_radio);
477 release_region(io, 8);
478 }
479
480 module_init(typhoon_init);
481 module_exit(typhoon_cleanup_module);
482
Linux with added FPC-III support