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ipip: used time_before for comparing jiffies
[linux-2.6.git] / drivers / media / radio / radio-typhoon.c
blob5c3b319dab37cadaadc64c576bc18482e943d444
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 unsigned long in_use;
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 typhoon_device *typhoon = video_drvdata(file);
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 typhoon_device *typhoon = video_drvdata(file);
237
238 f->type = V4L2_TUNER_RADIO;
239 f->frequency = typhoon->curfreq;
240
241 return 0;
242 }
243
244 static int vidioc_queryctrl(struct file *file, void *priv,
245 struct v4l2_queryctrl *qc)
246 {
247 int i;
248
249 for (i = 0; i < ARRAY_SIZE(radio_qctrl); i++) {
250 if (qc->id && qc->id == radio_qctrl[i].id) {
251 memcpy(qc, &(radio_qctrl[i]),
252 sizeof(*qc));
253 return 0;
254 }
255 }
256 return -EINVAL;
257 }
258
259 static int vidioc_g_ctrl(struct file *file, void *priv,
260 struct v4l2_control *ctrl)
261 {
262 struct typhoon_device *typhoon = video_drvdata(file);
263
264 switch (ctrl->id) {
265 case V4L2_CID_AUDIO_MUTE:
266 ctrl->value = typhoon->muted;
267 return 0;
268 case V4L2_CID_AUDIO_VOLUME:
269 ctrl->value = typhoon->curvol;
270 return 0;
271 }
272 return -EINVAL;
273 }
274
275 static int vidioc_s_ctrl (struct file *file, void *priv,
276 struct v4l2_control *ctrl)
277 {
278 struct typhoon_device *typhoon = video_drvdata(file);
279
280 switch (ctrl->id) {
281 case V4L2_CID_AUDIO_MUTE:
282 if (ctrl->value)
283 typhoon_mute(typhoon);
284 else
285 typhoon_unmute(typhoon);
286 return 0;
287 case V4L2_CID_AUDIO_VOLUME:
288 typhoon_setvol(typhoon, ctrl->value);
289 return 0;
290 }
291 return -EINVAL;
292 }
293
294 static int vidioc_g_audio(struct file *file, void *priv,
295 struct v4l2_audio *a)
296 {
297 if (a->index > 1)
298 return -EINVAL;
299
300 strcpy(a->name, "Radio");
301 a->capability = V4L2_AUDCAP_STEREO;
302 return 0;
303 }
304
305 static int vidioc_g_input(struct file *filp, void *priv, unsigned int *i)
306 {
307 *i = 0;
308 return 0;
309 }
310
311 static int vidioc_s_input(struct file *filp, void *priv, unsigned int i)
312 {
313 if (i != 0)
314 return -EINVAL;
315 return 0;
316 }
317
318 static int vidioc_s_audio(struct file *file, void *priv,
319 struct v4l2_audio *a)
320 {
321 if (a->index != 0)
322 return -EINVAL;
323 return 0;
324 }
325
326 static struct typhoon_device typhoon_unit =
327 {
328 .iobase = CONFIG_RADIO_TYPHOON_PORT,
329 .curfreq = CONFIG_RADIO_TYPHOON_MUTEFREQ,
330 .mutefreq = CONFIG_RADIO_TYPHOON_MUTEFREQ,
331 };
332
333 static int typhoon_exclusive_open(struct file *file)
334 {
335 return test_and_set_bit(0, &typhoon_unit.in_use) ? -EBUSY : 0;
336 }
337
338 static int typhoon_exclusive_release(struct file *file)
339 {
340 clear_bit(0, &typhoon_unit.in_use);
341 return 0;
342 }
343
344 static const struct v4l2_file_operations typhoon_fops = {
345 .owner = THIS_MODULE,
346 .open = typhoon_exclusive_open,
347 .release = typhoon_exclusive_release,
348 .ioctl = video_ioctl2,
349 };
350
351 static const struct v4l2_ioctl_ops typhoon_ioctl_ops = {
352 .vidioc_querycap = vidioc_querycap,
353 .vidioc_g_tuner = vidioc_g_tuner,
354 .vidioc_s_tuner = vidioc_s_tuner,
355 .vidioc_g_audio = vidioc_g_audio,
356 .vidioc_s_audio = vidioc_s_audio,
357 .vidioc_g_input = vidioc_g_input,
358 .vidioc_s_input = vidioc_s_input,
359 .vidioc_g_frequency = vidioc_g_frequency,
360 .vidioc_s_frequency = vidioc_s_frequency,
361 .vidioc_queryctrl = vidioc_queryctrl,
362 .vidioc_g_ctrl = vidioc_g_ctrl,
363 .vidioc_s_ctrl = vidioc_s_ctrl,
364 };
365
366 static struct video_device typhoon_radio = {
367 .name = "Typhoon Radio",
368 .fops = &typhoon_fops,
369 .ioctl_ops = &typhoon_ioctl_ops,
370 .release = video_device_release_empty,
371 };
372
373 #ifdef CONFIG_RADIO_TYPHOON_PROC_FS
374
375 static int typhoon_proc_show(struct seq_file *m, void *v)
376 {
377 #ifdef MODULE
378 #define MODULEPROCSTRING "Driver loaded as a module"
379 #else
380 #define MODULEPROCSTRING "Driver compiled into kernel"
381 #endif
382
383 seq_puts(m, BANNER);
384 seq_puts(m, "Load type: " MODULEPROCSTRING "\n\n");
385 seq_printf(m, "frequency = %lu kHz\n",
386 typhoon_unit.curfreq >> 4);
387 seq_printf(m, "volume = %d\n", typhoon_unit.curvol);
388 seq_printf(m, "mute = %s\n", typhoon_unit.muted ?
389 "on" : "off");
390 seq_printf(m, "iobase = 0x%x\n", typhoon_unit.iobase);
391 seq_printf(m, "mute frequency = %lu kHz\n",
392 typhoon_unit.mutefreq >> 4);
393 return 0;
394 }
395
396 static int typhoon_proc_open(struct inode *inode, struct file *file)
397 {
398 return single_open(file, typhoon_proc_show, NULL);
399 }
400
401 static const struct file_operations typhoon_proc_fops = {
402 .owner = THIS_MODULE,
403 .open = typhoon_proc_open,
404 .read = seq_read,
405 .llseek = seq_lseek,
406 .release = single_release,
407 };
408 #endif /* CONFIG_RADIO_TYPHOON_PROC_FS */
409
410 MODULE_AUTHOR("Dr. Henrik Seidel");
411 MODULE_DESCRIPTION("A driver for the Typhoon radio card (a.k.a. EcoRadio).");
412 MODULE_LICENSE("GPL");
413
414 static int io = -1;
415 static int radio_nr = -1;
416
417 module_param(io, int, 0);
418 MODULE_PARM_DESC(io, "I/O address of the Typhoon card (0x316 or 0x336)");
419 module_param(radio_nr, int, 0);
420
421 #ifdef MODULE
422 static unsigned long mutefreq;
423 module_param(mutefreq, ulong, 0);
424 MODULE_PARM_DESC(mutefreq, "Frequency used when muting the card (in kHz)");
425 #endif
426
427 static int __init typhoon_init(void)
428 {
429 #ifdef MODULE
430 if (io == -1) {
431 printk(KERN_ERR "radio-typhoon: You must set an I/O address with io=0x316 or io=0x336\n");
432 return -EINVAL;
433 }
434 typhoon_unit.iobase = io;
435
436 if (mutefreq < 87000 || mutefreq > 108500) {
437 printk(KERN_ERR "radio-typhoon: You must set a frequency (in kHz) used when muting the card,\n");
438 printk(KERN_ERR "radio-typhoon: e.g. with \"mutefreq=87500\" (87000 <= mutefreq <= 108500)\n");
439 return -EINVAL;
440 }
441 typhoon_unit.mutefreq = mutefreq;
442 #endif /* MODULE */
443
444 printk(KERN_INFO BANNER);
445 mutex_init(&typhoon_unit.lock);
446 io = typhoon_unit.iobase;
447 if (!request_region(io, 8, "typhoon")) {
448 printk(KERN_ERR "radio-typhoon: port 0x%x already in use\n",
449 typhoon_unit.iobase);
450 return -EBUSY;
451 }
452
453 video_set_drvdata(&typhoon_radio, &typhoon_unit);
454 if (video_register_device(&typhoon_radio, VFL_TYPE_RADIO, radio_nr) < 0) {
455 release_region(io, 8);
456 return -EINVAL;
457 }
458 printk(KERN_INFO "radio-typhoon: port 0x%x.\n", typhoon_unit.iobase);
459 printk(KERN_INFO "radio-typhoon: mute frequency is %lu kHz.\n",
460 typhoon_unit.mutefreq);
461 typhoon_unit.mutefreq <<= 4;
462
463 /* mute card - prevents noisy bootups */
464 typhoon_mute(&typhoon_unit);
465
466 #ifdef CONFIG_RADIO_TYPHOON_PROC_FS
467 if (!proc_create("driver/radio-typhoon", 0, NULL, &typhoon_proc_fops))
468 printk(KERN_ERR "radio-typhoon: registering /proc/driver/radio-typhoon failed\n");
469 #endif
470
471 return 0;
472 }
473
474 static void __exit typhoon_cleanup_module(void)
475 {
476
477 #ifdef CONFIG_RADIO_TYPHOON_PROC_FS
478 remove_proc_entry("driver/radio-typhoon", NULL);
479 #endif
480
481 video_unregister_device(&typhoon_radio);
482 release_region(io, 8);
483 }
484
485 module_init(typhoon_init);
486 module_exit(typhoon_cleanup_module);
487
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