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System call wrappers part 05
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / media / radio / radio-typhoon.c
blobf8d62cfea7745d28cdda0c5be81667e4fb571c09
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 #include <media/v4l2-ioctl.h>
44
45 #include <linux/version.h> /* for KERNEL_VERSION MACRO */
46 #define RADIO_VERSION KERNEL_VERSION(0,1,1)
47 #define BANNER "Typhoon Radio Card driver v0.1.1\n"
48
49 static struct v4l2_queryctrl radio_qctrl[] = {
50 {
51 .id = V4L2_CID_AUDIO_MUTE,
52 .name = "Mute",
53 .minimum = 0,
54 .maximum = 1,
55 .default_value = 1,
56 .type = V4L2_CTRL_TYPE_BOOLEAN,
57 },{
58 .id = V4L2_CID_AUDIO_VOLUME,
59 .name = "Volume",
60 .minimum = 0,
61 .maximum = 65535,
62 .step = 1<<14,
63 .default_value = 0xff,
64 .type = V4L2_CTRL_TYPE_INTEGER,
65 }
66 };
67
68
69 #ifndef CONFIG_RADIO_TYPHOON_PORT
70 #define CONFIG_RADIO_TYPHOON_PORT -1
71 #endif
72
73 #ifndef CONFIG_RADIO_TYPHOON_MUTEFREQ
74 #define CONFIG_RADIO_TYPHOON_MUTEFREQ 0
75 #endif
76
77 #ifndef CONFIG_PROC_FS
78 #undef CONFIG_RADIO_TYPHOON_PROC_FS
79 #endif
80
81 struct typhoon_device {
82 int users;
83 int iobase;
84 int curvol;
85 int muted;
86 unsigned long curfreq;
87 unsigned long mutefreq;
88 struct mutex lock;
89 };
90
91 static void typhoon_setvol_generic(struct typhoon_device *dev, int vol);
92 static int typhoon_setfreq_generic(struct typhoon_device *dev,
93 unsigned long frequency);
94 static int typhoon_setfreq(struct typhoon_device *dev, unsigned long frequency);
95 static void typhoon_mute(struct typhoon_device *dev);
96 static void typhoon_unmute(struct typhoon_device *dev);
97 static int typhoon_setvol(struct typhoon_device *dev, int vol);
98
99 static void typhoon_setvol_generic(struct typhoon_device *dev, int vol)
100 {
101 mutex_lock(&dev->lock);
102 vol >>= 14; /* Map 16 bit to 2 bit */
103 vol &= 3;
104 outb_p(vol / 2, dev->iobase); /* Set the volume, high bit. */
105 outb_p(vol % 2, dev->iobase + 2); /* Set the volume, low bit. */
106 mutex_unlock(&dev->lock);
107 }
108
109 static int typhoon_setfreq_generic(struct typhoon_device *dev,
110 unsigned long frequency)
111 {
112 unsigned long outval;
113 unsigned long x;
114
115 /*
116 * The frequency transfer curve is not linear. The best fit I could
117 * get is
118 *
119 * outval = -155 + exp((f + 15.55) * 0.057))
120 *
121 * where frequency f is in MHz. Since we don't have exp in the kernel,
122 * I approximate this function by a third order polynomial.
123 *
124 */
125
126 mutex_lock(&dev->lock);
127 x = frequency / 160;
128 outval = (x * x + 2500) / 5000;
129 outval = (outval * x + 5000) / 10000;
130 outval -= (10 * x * x + 10433) / 20866;
131 outval += 4 * x - 11505;
132
133 outb_p((outval >> 8) & 0x01, dev->iobase + 4);
134 outb_p(outval >> 9, dev->iobase + 6);
135 outb_p(outval & 0xff, dev->iobase + 8);
136 mutex_unlock(&dev->lock);
137
138 return 0;
139 }
140
141 static int typhoon_setfreq(struct typhoon_device *dev, unsigned long frequency)
142 {
143 typhoon_setfreq_generic(dev, frequency);
144 dev->curfreq = frequency;
145 return 0;
146 }
147
148 static void typhoon_mute(struct typhoon_device *dev)
149 {
150 if (dev->muted == 1)
151 return;
152 typhoon_setvol_generic(dev, 0);
153 typhoon_setfreq_generic(dev, dev->mutefreq);
154 dev->muted = 1;
155 }
156
157 static void typhoon_unmute(struct typhoon_device *dev)
158 {
159 if (dev->muted == 0)
160 return;
161 typhoon_setfreq_generic(dev, dev->curfreq);
162 typhoon_setvol_generic(dev, dev->curvol);
163 dev->muted = 0;
164 }
165
166 static int typhoon_setvol(struct typhoon_device *dev, int vol)
167 {
168 if (dev->muted && vol != 0) { /* user is unmuting the card */
169 dev->curvol = vol;
170 typhoon_unmute(dev);
171 return 0;
172 }
173 if (vol == dev->curvol) /* requested volume == current */
174 return 0;
175
176 if (vol == 0) { /* volume == 0 means mute the card */
177 typhoon_mute(dev);
178 dev->curvol = vol;
179 return 0;
180 }
181 typhoon_setvol_generic(dev, vol);
182 dev->curvol = vol;
183 return 0;
184 }
185
186 static int vidioc_querycap(struct file *file, void *priv,
187 struct v4l2_capability *v)
188 {
189 strlcpy(v->driver, "radio-typhoon", sizeof(v->driver));
190 strlcpy(v->card, "Typhoon Radio", sizeof(v->card));
191 sprintf(v->bus_info, "ISA");
192 v->version = RADIO_VERSION;
193 v->capabilities = V4L2_CAP_TUNER;
194 return 0;
195 }
196
197 static int vidioc_g_tuner(struct file *file, void *priv,
198 struct v4l2_tuner *v)
199 {
200 if (v->index > 0)
201 return -EINVAL;
202
203 strcpy(v->name, "FM");
204 v->type = V4L2_TUNER_RADIO;
205 v->rangelow = (87.5*16000);
206 v->rangehigh = (108*16000);
207 v->rxsubchans = V4L2_TUNER_SUB_MONO;
208 v->capability = V4L2_TUNER_CAP_LOW;
209 v->audmode = V4L2_TUNER_MODE_MONO;
210 v->signal = 0xFFFF; /* We can't get the signal strength */
211 return 0;
212 }
213
214 static int vidioc_s_tuner(struct file *file, void *priv,
215 struct v4l2_tuner *v)
216 {
217 if (v->index > 0)
218 return -EINVAL;
219
220 return 0;
221 }
222
223 static int vidioc_s_frequency(struct file *file, void *priv,
224 struct v4l2_frequency *f)
225 {
226 struct video_device *dev = video_devdata(file);
227 struct typhoon_device *typhoon = dev->priv;
228
229 typhoon->curfreq = f->frequency;
230 typhoon_setfreq(typhoon, typhoon->curfreq);
231 return 0;
232 }
233
234 static int vidioc_g_frequency(struct file *file, void *priv,
235 struct v4l2_frequency *f)
236 {
237 struct video_device *dev = video_devdata(file);
238 struct typhoon_device *typhoon = dev->priv;
239
240 f->type = V4L2_TUNER_RADIO;
241 f->frequency = typhoon->curfreq;
242
243 return 0;
244 }
245
246 static int vidioc_queryctrl(struct file *file, void *priv,
247 struct v4l2_queryctrl *qc)
248 {
249 int i;
250
251 for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
252 if (qc->id && qc->id == radio_qctrl[i].id) {
253 memcpy(qc, &(radio_qctrl[i]),
254 sizeof(*qc));
255 return 0;
256 }
257 }
258 return -EINVAL;
259 }
260
261 static int vidioc_g_ctrl(struct file *file, void *priv,
262 struct v4l2_control *ctrl)
263 {
264 struct video_device *dev = video_devdata(file);
265 struct typhoon_device *typhoon = dev->priv;
266
267 switch (ctrl->id) {
268 case V4L2_CID_AUDIO_MUTE:
269 ctrl->value = typhoon->muted;
270 return 0;
271 case V4L2_CID_AUDIO_VOLUME:
272 ctrl->value = typhoon->curvol;
273 return 0;
274 }
275 return -EINVAL;
276 }
277
278 static int vidioc_s_ctrl (struct file *file, void *priv,
279 struct v4l2_control *ctrl)
280 {
281 struct video_device *dev = video_devdata(file);
282 struct typhoon_device *typhoon = dev->priv;
283
284 switch (ctrl->id) {
285 case V4L2_CID_AUDIO_MUTE:
286 if (ctrl->value)
287 typhoon_mute(typhoon);
288 else
289 typhoon_unmute(typhoon);
290 return 0;
291 case V4L2_CID_AUDIO_VOLUME:
292 typhoon_setvol(typhoon, ctrl->value);
293 return 0;
294 }
295 return -EINVAL;
296 }
297
298 static int vidioc_g_audio(struct file *file, void *priv,
299 struct v4l2_audio *a)
300 {
301 if (a->index > 1)
302 return -EINVAL;
303
304 strcpy(a->name, "Radio");
305 a->capability = V4L2_AUDCAP_STEREO;
306 return 0;
307 }
308
309 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
310 {
311 *i = 0;
312 return 0;
313 }
314
315 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
316 {
317 if (i != 0)
318 return -EINVAL;
319 return 0;
320 }
321
322 static int vidioc_s_audio(struct file *file, void *priv,
323 struct v4l2_audio *a)
324 {
325 if (a->index != 0)
326 return -EINVAL;
327 return 0;
328 }
329
330 static struct typhoon_device typhoon_unit =
331 {
332 .iobase = CONFIG_RADIO_TYPHOON_PORT,
333 .curfreq = CONFIG_RADIO_TYPHOON_MUTEFREQ,
334 .mutefreq = CONFIG_RADIO_TYPHOON_MUTEFREQ,
335 };
336
337 static const struct file_operations typhoon_fops = {
338 .owner = THIS_MODULE,
339 .open = video_exclusive_open,
340 .release = video_exclusive_release,
341 .ioctl = video_ioctl2,
342 #ifdef CONFIG_COMPAT
343 .compat_ioctl = v4l_compat_ioctl32,
344 #endif
345 .llseek = no_llseek,
346 };
347
348 static const struct v4l2_ioctl_ops typhoon_ioctl_ops = {
349 .vidioc_querycap = vidioc_querycap,
350 .vidioc_g_tuner = vidioc_g_tuner,
351 .vidioc_s_tuner = vidioc_s_tuner,
352 .vidioc_g_audio = vidioc_g_audio,
353 .vidioc_s_audio = vidioc_s_audio,
354 .vidioc_g_input = vidioc_g_input,
355 .vidioc_s_input = vidioc_s_input,
356 .vidioc_g_frequency = vidioc_g_frequency,
357 .vidioc_s_frequency = vidioc_s_frequency,
358 .vidioc_queryctrl = vidioc_queryctrl,
359 .vidioc_g_ctrl = vidioc_g_ctrl,
360 .vidioc_s_ctrl = vidioc_s_ctrl,
361 };
362
363 static struct video_device typhoon_radio = {
364 .name = "Typhoon Radio",
365 .fops = &typhoon_fops,
366 .ioctl_ops = &typhoon_ioctl_ops,
367 };
368
369 #ifdef CONFIG_RADIO_TYPHOON_PROC_FS
370
371 static int typhoon_proc_show(struct seq_file *m, void *v)
372 {
373 #ifdef MODULE
374 #define MODULEPROCSTRING "Driver loaded as a module"
375 #else
376 #define MODULEPROCSTRING "Driver compiled into kernel"
377 #endif
378
379 seq_puts(m, BANNER);
380 seq_puts(m, "Load type: " MODULEPROCSTRING "\n\n");
381 seq_printf(m, "frequency = %lu kHz\n",
382 typhoon_unit.curfreq >> 4);
383 seq_printf(m, "volume = %d\n", typhoon_unit.curvol);
384 seq_printf(m, "mute = %s\n", typhoon_unit.muted ?
385 "on" : "off");
386 seq_printf(m, "iobase = 0x%x\n", typhoon_unit.iobase);
387 seq_printf(m, "mute frequency = %lu kHz\n",
388 typhoon_unit.mutefreq >> 4);
389 return 0;
390 }
391
392 static int typhoon_proc_open(struct inode *inode, struct file *file)
393 {
394 return single_open(file, typhoon_proc_show, NULL);
395 }
396
397 static const struct file_operations typhoon_proc_fops = {
398 .owner = THIS_MODULE,
399 .open = typhoon_proc_open,
400 .read = seq_read,
401 .llseek = seq_lseek,
402 .release = single_release,
403 };
404 #endif /* CONFIG_RADIO_TYPHOON_PROC_FS */
405
406 MODULE_AUTHOR("Dr. Henrik Seidel");
407 MODULE_DESCRIPTION("A driver for the Typhoon radio card (a.k.a. EcoRadio).");
408 MODULE_LICENSE("GPL");
409
410 static int io = -1;
411 static int radio_nr = -1;
412
413 module_param(io, int, 0);
414 MODULE_PARM_DESC(io, "I/O address of the Typhoon card (0x316 or 0x336)");
415 module_param(radio_nr, int, 0);
416
417 #ifdef MODULE
418 static unsigned long mutefreq;
419 module_param(mutefreq, ulong, 0);
420 MODULE_PARM_DESC(mutefreq, "Frequency used when muting the card (in kHz)");
421 #endif
422
423 static int __init typhoon_init(void)
424 {
425 #ifdef MODULE
426 if (io == -1) {
427 printk(KERN_ERR "radio-typhoon: You must set an I/O address with io=0x316 or io=0x336\n");
428 return -EINVAL;
429 }
430 typhoon_unit.iobase = io;
431
432 if (mutefreq < 87000 || mutefreq > 108500) {
433 printk(KERN_ERR "radio-typhoon: You must set a frequency (in kHz) used when muting the card,\n");
434 printk(KERN_ERR "radio-typhoon: e.g. with \"mutefreq=87500\" (87000 <= mutefreq <= 108500)\n");
435 return -EINVAL;
436 }
437 typhoon_unit.mutefreq = mutefreq;
438 #endif /* MODULE */
439
440 printk(KERN_INFO BANNER);
441 mutex_init(&typhoon_unit.lock);
442 io = typhoon_unit.iobase;
443 if (!request_region(io, 8, "typhoon")) {
444 printk(KERN_ERR "radio-typhoon: port 0x%x already in use\n",
445 typhoon_unit.iobase);
446 return -EBUSY;
447 }
448
449 typhoon_radio.priv = &typhoon_unit;
450 if (video_register_device(&typhoon_radio, VFL_TYPE_RADIO, radio_nr) == -1)
451 {
452 release_region(io, 8);
453 return -EINVAL;
454 }
455 printk(KERN_INFO "radio-typhoon: port 0x%x.\n", typhoon_unit.iobase);
456 printk(KERN_INFO "radio-typhoon: mute frequency is %lu kHz.\n",
457 typhoon_unit.mutefreq);
458 typhoon_unit.mutefreq <<= 4;
459
460 /* mute card - prevents noisy bootups */
461 typhoon_mute(&typhoon_unit);
462
463 #ifdef CONFIG_RADIO_TYPHOON_PROC_FS
464 if (!proc_create("driver/radio-typhoon", 0, NULL, &typhoon_proc_fops))
465 printk(KERN_ERR "radio-typhoon: registering /proc/driver/radio-typhoon failed\n");
466 #endif
467
468 return 0;
469 }
470
471 static void __exit typhoon_cleanup_module(void)
472 {
473
474 #ifdef CONFIG_RADIO_TYPHOON_PROC_FS
475 remove_proc_entry("driver/radio-typhoon", NULL);
476 #endif
477
478 video_unregister_device(&typhoon_radio);
479 release_region(io, 8);
480 }
481
482 module_init(typhoon_init);
483 module_exit(typhoon_cleanup_module);
484
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