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mm/slab.c: proper prototypes
[wrt350n-kernel.git] / drivers / media / radio / radio-typhoon.c
blob8ff5a23a9f01adedb7aeb875c452398f566cc968
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 <asm/io.h> /* outb, outb_p */
39 #include <asm/uaccess.h> /* copy to/from user */
40 #include <linux/videodev2.h> /* kernel radio structs */
41 #include <media/v4l2-common.h>
42
43 #include <linux/version.h> /* for KERNEL_VERSION MACRO */
44 #define RADIO_VERSION KERNEL_VERSION(0,1,1)
45 #define BANNER "Typhoon Radio Card driver v0.1.1\n"
46
47 static struct v4l2_queryctrl radio_qctrl[] = {
48 {
49 .id = V4L2_CID_AUDIO_MUTE,
50 .name = "Mute",
51 .minimum = 0,
52 .maximum = 1,
53 .default_value = 1,
54 .type = V4L2_CTRL_TYPE_BOOLEAN,
55 },{
56 .id = V4L2_CID_AUDIO_VOLUME,
57 .name = "Volume",
58 .minimum = 0,
59 .maximum = 65535,
60 .step = 1<<14,
61 .default_value = 0xff,
62 .type = V4L2_CTRL_TYPE_INTEGER,
63 }
64 };
65
66
67 #ifndef CONFIG_RADIO_TYPHOON_PORT
68 #define CONFIG_RADIO_TYPHOON_PORT -1
69 #endif
70
71 #ifndef CONFIG_RADIO_TYPHOON_MUTEFREQ
72 #define CONFIG_RADIO_TYPHOON_MUTEFREQ 0
73 #endif
74
75 #ifndef CONFIG_PROC_FS
76 #undef CONFIG_RADIO_TYPHOON_PROC_FS
77 #endif
78
79 struct typhoon_device {
80 int users;
81 int iobase;
82 int curvol;
83 int muted;
84 unsigned long curfreq;
85 unsigned long mutefreq;
86 struct mutex lock;
87 };
88
89 static void typhoon_setvol_generic(struct typhoon_device *dev, int vol);
90 static int typhoon_setfreq_generic(struct typhoon_device *dev,
91 unsigned long frequency);
92 static int typhoon_setfreq(struct typhoon_device *dev, unsigned long frequency);
93 static void typhoon_mute(struct typhoon_device *dev);
94 static void typhoon_unmute(struct typhoon_device *dev);
95 static int typhoon_setvol(struct typhoon_device *dev, int vol);
96 #ifdef CONFIG_RADIO_TYPHOON_PROC_FS
97 static int typhoon_get_info(char *buf, char **start, off_t offset, int len);
98 #endif
99
100 static void typhoon_setvol_generic(struct typhoon_device *dev, int vol)
101 {
102 mutex_lock(&dev->lock);
103 vol >>= 14; /* Map 16 bit to 2 bit */
104 vol &= 3;
105 outb_p(vol / 2, dev->iobase); /* Set the volume, high bit. */
106 outb_p(vol % 2, dev->iobase + 2); /* Set the volume, low bit. */
107 mutex_unlock(&dev->lock);
108 }
109
110 static int typhoon_setfreq_generic(struct typhoon_device *dev,
111 unsigned long frequency)
112 {
113 unsigned long outval;
114 unsigned long x;
115
116 /*
117 * The frequency transfer curve is not linear. The best fit I could
118 * get is
119 *
120 * outval = -155 + exp((f + 15.55) * 0.057))
121 *
122 * where frequency f is in MHz. Since we don't have exp in the kernel,
123 * I approximate this function by a third order polynomial.
124 *
125 */
126
127 mutex_lock(&dev->lock);
128 x = frequency / 160;
129 outval = (x * x + 2500) / 5000;
130 outval = (outval * x + 5000) / 10000;
131 outval -= (10 * x * x + 10433) / 20866;
132 outval += 4 * x - 11505;
133
134 outb_p((outval >> 8) & 0x01, dev->iobase + 4);
135 outb_p(outval >> 9, dev->iobase + 6);
136 outb_p(outval & 0xff, dev->iobase + 8);
137 mutex_unlock(&dev->lock);
138
139 return 0;
140 }
141
142 static int typhoon_setfreq(struct typhoon_device *dev, unsigned long frequency)
143 {
144 typhoon_setfreq_generic(dev, frequency);
145 dev->curfreq = frequency;
146 return 0;
147 }
148
149 static void typhoon_mute(struct typhoon_device *dev)
150 {
151 if (dev->muted == 1)
152 return;
153 typhoon_setvol_generic(dev, 0);
154 typhoon_setfreq_generic(dev, dev->mutefreq);
155 dev->muted = 1;
156 }
157
158 static void typhoon_unmute(struct typhoon_device *dev)
159 {
160 if (dev->muted == 0)
161 return;
162 typhoon_setfreq_generic(dev, dev->curfreq);
163 typhoon_setvol_generic(dev, dev->curvol);
164 dev->muted = 0;
165 }
166
167 static int typhoon_setvol(struct typhoon_device *dev, int vol)
168 {
169 if (dev->muted && vol != 0) { /* user is unmuting the card */
170 dev->curvol = vol;
171 typhoon_unmute(dev);
172 return 0;
173 }
174 if (vol == dev->curvol) /* requested volume == current */
175 return 0;
176
177 if (vol == 0) { /* volume == 0 means mute the card */
178 typhoon_mute(dev);
179 dev->curvol = vol;
180 return 0;
181 }
182 typhoon_setvol_generic(dev, vol);
183 dev->curvol = vol;
184 return 0;
185 }
186
187 static int vidioc_querycap(struct file *file, void *priv,
188 struct v4l2_capability *v)
189 {
190 strlcpy(v->driver, "radio-typhoon", sizeof(v->driver));
191 strlcpy(v->card, "Typhoon Radio", sizeof(v->card));
192 sprintf(v->bus_info, "ISA");
193 v->version = RADIO_VERSION;
194 v->capabilities = V4L2_CAP_TUNER;
195 return 0;
196 }
197
198 static int vidioc_g_tuner(struct file *file, void *priv,
199 struct v4l2_tuner *v)
200 {
201 if (v->index > 0)
202 return -EINVAL;
203
204 strcpy(v->name, "FM");
205 v->type = V4L2_TUNER_RADIO;
206 v->rangelow = (87.5*16000);
207 v->rangehigh = (108*16000);
208 v->rxsubchans = V4L2_TUNER_SUB_MONO;
209 v->capability = V4L2_TUNER_CAP_LOW;
210 v->audmode = V4L2_TUNER_MODE_MONO;
211 v->signal = 0xFFFF; /* We can't get the signal strength */
212 return 0;
213 }
214
215 static int vidioc_s_tuner(struct file *file, void *priv,
216 struct v4l2_tuner *v)
217 {
218 if (v->index > 0)
219 return -EINVAL;
220
221 return 0;
222 }
223
224 static int vidioc_s_frequency(struct file *file, void *priv,
225 struct v4l2_frequency *f)
226 {
227 struct video_device *dev = video_devdata(file);
228 struct typhoon_device *typhoon = dev->priv;
229
230 typhoon->curfreq = f->frequency;
231 typhoon_setfreq(typhoon, typhoon->curfreq);
232 return 0;
233 }
234
235 static int vidioc_g_frequency(struct file *file, void *priv,
236 struct v4l2_frequency *f)
237 {
238 struct video_device *dev = video_devdata(file);
239 struct typhoon_device *typhoon = dev->priv;
240
241 f->type = V4L2_TUNER_RADIO;
242 f->frequency = typhoon->curfreq;
243
244 return 0;
245 }
246
247 static int vidioc_queryctrl(struct file *file, void *priv,
248 struct v4l2_queryctrl *qc)
249 {
250 int i;
251
252 for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
253 if (qc->id && qc->id == radio_qctrl[i].id) {
254 memcpy(qc, &(radio_qctrl[i]),
255 sizeof(*qc));
256 return 0;
257 }
258 }
259 return -EINVAL;
260 }
261
262 static int vidioc_g_ctrl(struct file *file, void *priv,
263 struct v4l2_control *ctrl)
264 {
265 struct video_device *dev = video_devdata(file);
266 struct typhoon_device *typhoon = dev->priv;
267
268 switch (ctrl->id) {
269 case V4L2_CID_AUDIO_MUTE:
270 ctrl->value = typhoon->muted;
271 return 0;
272 case V4L2_CID_AUDIO_VOLUME:
273 ctrl->value = typhoon->curvol;
274 return 0;
275 }
276 return -EINVAL;
277 }
278
279 static int vidioc_s_ctrl (struct file *file, void *priv,
280 struct v4l2_control *ctrl)
281 {
282 struct video_device *dev = video_devdata(file);
283 struct typhoon_device *typhoon = dev->priv;
284
285 switch (ctrl->id) {
286 case V4L2_CID_AUDIO_MUTE:
287 if (ctrl->value)
288 typhoon_mute(typhoon);
289 else
290 typhoon_unmute(typhoon);
291 return 0;
292 case V4L2_CID_AUDIO_VOLUME:
293 typhoon_setvol(typhoon, ctrl->value);
294 return 0;
295 }
296 return -EINVAL;
297 }
298
299 static int vidioc_g_audio(struct file *file, void *priv,
300 struct v4l2_audio *a)
301 {
302 if (a->index > 1)
303 return -EINVAL;
304
305 strcpy(a->name, "Radio");
306 a->capability = V4L2_AUDCAP_STEREO;
307 return 0;
308 }
309
310 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
311 {
312 *i = 0;
313 return 0;
314 }
315
316 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
317 {
318 if (i != 0)
319 return -EINVAL;
320 return 0;
321 }
322
323 static int vidioc_s_audio(struct file *file, void *priv,
324 struct v4l2_audio *a)
325 {
326 if (a->index != 0)
327 return -EINVAL;
328 return 0;
329 }
330
331 static struct typhoon_device typhoon_unit =
332 {
333 .iobase = CONFIG_RADIO_TYPHOON_PORT,
334 .curfreq = CONFIG_RADIO_TYPHOON_MUTEFREQ,
335 .mutefreq = CONFIG_RADIO_TYPHOON_MUTEFREQ,
336 };
337
338 static const struct file_operations typhoon_fops = {
339 .owner = THIS_MODULE,
340 .open = video_exclusive_open,
341 .release = video_exclusive_release,
342 .ioctl = video_ioctl2,
343 .compat_ioctl = v4l_compat_ioctl32,
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 .hardware = 0,
353 .fops = &typhoon_fops,
354 .vidioc_querycap = vidioc_querycap,
355 .vidioc_g_tuner = vidioc_g_tuner,
356 .vidioc_s_tuner = vidioc_s_tuner,
357 .vidioc_g_audio = vidioc_g_audio,
358 .vidioc_s_audio = vidioc_s_audio,
359 .vidioc_g_input = vidioc_g_input,
360 .vidioc_s_input = vidioc_s_input,
361 .vidioc_g_frequency = vidioc_g_frequency,
362 .vidioc_s_frequency = vidioc_s_frequency,
363 .vidioc_queryctrl = vidioc_queryctrl,
364 .vidioc_g_ctrl = vidioc_g_ctrl,
365 .vidioc_s_ctrl = vidioc_s_ctrl,
366 };
367
368 #ifdef CONFIG_RADIO_TYPHOON_PROC_FS
369
370 static int typhoon_get_info(char *buf, char **start, off_t offset, int len)
371 {
372 char *out = buf;
373
374 #ifdef MODULE
375 #define MODULEPROCSTRING "Driver loaded as a module"
376 #else
377 #define MODULEPROCSTRING "Driver compiled into kernel"
378 #endif
379
380 /* output must be kept under PAGE_SIZE */
381 out += sprintf(out, BANNER);
382 out += sprintf(out, "Load type: " MODULEPROCSTRING "\n\n");
383 out += sprintf(out, "frequency = %lu kHz\n",
384 typhoon_unit.curfreq >> 4);
385 out += sprintf(out, "volume = %d\n", typhoon_unit.curvol);
386 out += sprintf(out, "mute = %s\n", typhoon_unit.muted ?
387 "on" : "off");
388 out += sprintf(out, "iobase = 0x%x\n", typhoon_unit.iobase);
389 out += sprintf(out, "mute frequency = %lu kHz\n",
390 typhoon_unit.mutefreq >> 4);
391 return out - buf;
392 }
393
394 #endif /* CONFIG_RADIO_TYPHOON_PROC_FS */
395
396 MODULE_AUTHOR("Dr. Henrik Seidel");
397 MODULE_DESCRIPTION("A driver for the Typhoon radio card (a.k.a. EcoRadio).");
398 MODULE_LICENSE("GPL");
399
400 static int io = -1;
401 static int radio_nr = -1;
402
403 module_param(io, int, 0);
404 MODULE_PARM_DESC(io, "I/O address of the Typhoon card (0x316 or 0x336)");
405 module_param(radio_nr, int, 0);
406
407 #ifdef MODULE
408 static unsigned long mutefreq = 0;
409 module_param(mutefreq, ulong, 0);
410 MODULE_PARM_DESC(mutefreq, "Frequency used when muting the card (in kHz)");
411 #endif
412
413 static int __init typhoon_init(void)
414 {
415 #ifdef MODULE
416 if (io == -1) {
417 printk(KERN_ERR "radio-typhoon: You must set an I/O address with io=0x316 or io=0x336\n");
418 return -EINVAL;
419 }
420 typhoon_unit.iobase = io;
421
422 if (mutefreq < 87000 || mutefreq > 108500) {
423 printk(KERN_ERR "radio-typhoon: You must set a frequency (in kHz) used when muting the card,\n");
424 printk(KERN_ERR "radio-typhoon: e.g. with \"mutefreq=87500\" (87000 <= mutefreq <= 108500)\n");
425 return -EINVAL;
426 }
427 typhoon_unit.mutefreq = mutefreq;
428 #endif /* MODULE */
429
430 printk(KERN_INFO BANNER);
431 mutex_init(&typhoon_unit.lock);
432 io = typhoon_unit.iobase;
433 if (!request_region(io, 8, "typhoon")) {
434 printk(KERN_ERR "radio-typhoon: port 0x%x already in use\n",
435 typhoon_unit.iobase);
436 return -EBUSY;
437 }
438
439 typhoon_radio.priv = &typhoon_unit;
440 if (video_register_device(&typhoon_radio, VFL_TYPE_RADIO, radio_nr) == -1)
441 {
442 release_region(io, 8);
443 return -EINVAL;
444 }
445 printk(KERN_INFO "radio-typhoon: port 0x%x.\n", typhoon_unit.iobase);
446 printk(KERN_INFO "radio-typhoon: mute frequency is %lu kHz.\n",
447 typhoon_unit.mutefreq);
448 typhoon_unit.mutefreq <<= 4;
449
450 /* mute card - prevents noisy bootups */
451 typhoon_mute(&typhoon_unit);
452
453 #ifdef CONFIG_RADIO_TYPHOON_PROC_FS
454 if (!create_proc_info_entry("driver/radio-typhoon", 0, NULL,
455 typhoon_get_info))
456 printk(KERN_ERR "radio-typhoon: registering /proc/driver/radio-typhoon failed\n");
457 #endif
458
459 return 0;
460 }
461
462 static void __exit typhoon_cleanup_module(void)
463 {
464
465 #ifdef CONFIG_RADIO_TYPHOON_PROC_FS
466 remove_proc_entry("driver/radio-typhoon", NULL);
467 #endif
468
469 video_unregister_device(&typhoon_radio);
470 release_region(io, 8);
471 }
472
473 module_init(typhoon_init);
474 module_exit(typhoon_cleanup_module);
475
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