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
32 #include <linux/module.h> /* Modules */
33 #include <linux/init.h> /* Initdata */
34 #include <linux/ioport.h> /* request_region */
35 #include <linux/proc_fs.h> /* radio card status report */
36 #include <asm/io.h> /* outb, outb_p */
37 #include <asm/uaccess.h> /* copy to/from user */
38 #include <linux/videodev.h> /* kernel radio structs */
39 #include <linux/config.h> /* CONFIG_RADIO_TYPHOON_* */
40
41 #define BANNER "Typhoon Radio Card driver v0.1\n"
42
43 #ifndef CONFIG_RADIO_TYPHOON_PORT
44 #define CONFIG_RADIO_TYPHOON_PORT -1
45 #endif
46
47 #ifndef CONFIG_RADIO_TYPHOON_MUTEFREQ
48 #define CONFIG_RADIO_TYPHOON_MUTEFREQ 0
49 #endif
50
51 #ifndef CONFIG_PROC_FS
52 #undef CONFIG_RADIO_TYPHOON_PROC_FS
53 #endif
54
55 struct typhoon_device {
56 int users;
57 int iobase;
58 int curvol;
59 int muted;
60 unsigned long curfreq;
61 unsigned long mutefreq;
62 struct mutex lock;
63 };
64
65 static void typhoon_setvol_generic(struct typhoon_device *dev, int vol);
66 static int typhoon_setfreq_generic(struct typhoon_device *dev,
67 unsigned long frequency);
68 static int typhoon_setfreq(struct typhoon_device *dev, unsigned long frequency);
69 static void typhoon_mute(struct typhoon_device *dev);
70 static void typhoon_unmute(struct typhoon_device *dev);
71 static int typhoon_setvol(struct typhoon_device *dev, int vol);
72 static int typhoon_ioctl(struct inode *inode, struct file *file,
73 unsigned int cmd, unsigned long arg);
74 #ifdef CONFIG_RADIO_TYPHOON_PROC_FS
75 static int typhoon_get_info(char *buf, char **start, off_t offset, int len);
76 #endif
77
78 static void typhoon_setvol_generic(struct typhoon_device *dev, int vol)
79 {
80 mutex_lock(&dev->lock);
81 vol >>= 14; /* Map 16 bit to 2 bit */
82 vol &= 3;
83 outb_p(vol / 2, dev->iobase); /* Set the volume, high bit. */
84 outb_p(vol % 2, dev->iobase + 2); /* Set the volume, low bit. */
85 mutex_unlock(&dev->lock);
86 }
87
88 static int typhoon_setfreq_generic(struct typhoon_device *dev,
89 unsigned long frequency)
90 {
91 unsigned long outval;
92 unsigned long x;
93
94 /*
95 * The frequency transfer curve is not linear. The best fit I could
96 * get is
97 *
98 * outval = -155 + exp((f + 15.55) * 0.057))
99 *
100 * where frequency f is in MHz. Since we don't have exp in the kernel,
101 * I approximate this function by a third order polynomial.
102 *
103 */
104
105 mutex_lock(&dev->lock);
106 x = frequency / 160;
107 outval = (x * x + 2500) / 5000;
108 outval = (outval * x + 5000) / 10000;
109 outval -= (10 * x * x + 10433) / 20866;
110 outval += 4 * x - 11505;
111
112 outb_p((outval >> 8) & 0x01, dev->iobase + 4);
113 outb_p(outval >> 9, dev->iobase + 6);
114 outb_p(outval & 0xff, dev->iobase + 8);
115 mutex_unlock(&dev->lock);
116
117 return 0;
118 }
119
120 static int typhoon_setfreq(struct typhoon_device *dev, unsigned long frequency)
121 {
122 typhoon_setfreq_generic(dev, frequency);
123 dev->curfreq = frequency;
124 return 0;
125 }
126
127 static void typhoon_mute(struct typhoon_device *dev)
128 {
129 if (dev->muted == 1)
130 return;
131 typhoon_setvol_generic(dev, 0);
132 typhoon_setfreq_generic(dev, dev->mutefreq);
133 dev->muted = 1;
134 }
135
136 static void typhoon_unmute(struct typhoon_device *dev)
137 {
138 if (dev->muted == 0)
139 return;
140 typhoon_setfreq_generic(dev, dev->curfreq);
141 typhoon_setvol_generic(dev, dev->curvol);
142 dev->muted = 0;
143 }
144
145 static int typhoon_setvol(struct typhoon_device *dev, int vol)
146 {
147 if (dev->muted && vol != 0) { /* user is unmuting the card */
148 dev->curvol = vol;
149 typhoon_unmute(dev);
150 return 0;
151 }
152 if (vol == dev->curvol) /* requested volume == current */
153 return 0;
154
155 if (vol == 0) { /* volume == 0 means mute the card */
156 typhoon_mute(dev);
157 dev->curvol = vol;
158 return 0;
159 }
160 typhoon_setvol_generic(dev, vol);
161 dev->curvol = vol;
162 return 0;
163 }
164
165
166 static int typhoon_do_ioctl(struct inode *inode, struct file *file,
167 unsigned int cmd, void *arg)
168 {
169 struct video_device *dev = video_devdata(file);
170 struct typhoon_device *typhoon = dev->priv;
171
172 switch (cmd) {
173 case VIDIOCGCAP:
174 {
175 struct video_capability *v = arg;
176 memset(v,0,sizeof(*v));
177 v->type = VID_TYPE_TUNER;
178 v->channels = 1;
179 v->audios = 1;
180 strcpy(v->name, "Typhoon Radio");
181 return 0;
182 }
183 case VIDIOCGTUNER:
184 {
185 struct video_tuner *v = arg;
186 if (v->tuner) /* Only 1 tuner */
187 return -EINVAL;
188 v->rangelow = 875 * 1600;
189 v->rangehigh = 1080 * 1600;
190 v->flags = VIDEO_TUNER_LOW;
191 v->mode = VIDEO_MODE_AUTO;
192 v->signal = 0xFFFF; /* We can't get the signal strength */
193 strcpy(v->name, "FM");
194 return 0;
195 }
196 case VIDIOCSTUNER:
197 {
198 struct video_tuner *v = arg;
199 if (v->tuner != 0)
200 return -EINVAL;
201 /* Only 1 tuner so no setting needed ! */
202 return 0;
203 }
204 case VIDIOCGFREQ:
205 {
206 unsigned long *freq = arg;
207 *freq = typhoon->curfreq;
208 return 0;
209 }
210 case VIDIOCSFREQ:
211 {
212 unsigned long *freq = arg;
213 typhoon->curfreq = *freq;
214 typhoon_setfreq(typhoon, typhoon->curfreq);
215 return 0;
216 }
217 case VIDIOCGAUDIO:
218 {
219 struct video_audio *v = arg;
220 memset(v, 0, sizeof(*v));
221 v->flags |= VIDEO_AUDIO_MUTABLE | VIDEO_AUDIO_VOLUME;
222 v->mode |= VIDEO_SOUND_MONO;
223 v->volume = typhoon->curvol;
224 v->step = 1 << 14;
225 strcpy(v->name, "Typhoon Radio");
226 return 0;
227 }
228 case VIDIOCSAUDIO:
229 {
230 struct video_audio *v = arg;
231 if (v->audio)
232 return -EINVAL;
233 if (v->flags & VIDEO_AUDIO_MUTE)
234 typhoon_mute(typhoon);
235 else
236 typhoon_unmute(typhoon);
237 if (v->flags & VIDEO_AUDIO_VOLUME)
238 typhoon_setvol(typhoon, v->volume);
239 return 0;
240 }
241 default:
242 return -ENOIOCTLCMD;
243 }
244 }
245
246 static int typhoon_ioctl(struct inode *inode, struct file *file,
247 unsigned int cmd, unsigned long arg)
248 {
249 return video_usercopy(inode, file, cmd, arg, typhoon_do_ioctl);
250 }
251
252 static struct typhoon_device typhoon_unit =
253 {
254 .iobase = CONFIG_RADIO_TYPHOON_PORT,
255 .curfreq = CONFIG_RADIO_TYPHOON_MUTEFREQ,
256 .mutefreq = CONFIG_RADIO_TYPHOON_MUTEFREQ,
257 };
258
259 static struct file_operations typhoon_fops = {
260 .owner = THIS_MODULE,
261 .open = video_exclusive_open,
262 .release = video_exclusive_release,
263 .ioctl = typhoon_ioctl,
264 .compat_ioctl = v4l_compat_ioctl32,
265 .llseek = no_llseek,
266 };
267
268 static struct video_device typhoon_radio =
269 {
270 .owner = THIS_MODULE,
271 .name = "Typhoon Radio",
272 .type = VID_TYPE_TUNER,
273 .hardware = VID_HARDWARE_TYPHOON,
274 .fops = &typhoon_fops,
275 };
276
277 #ifdef CONFIG_RADIO_TYPHOON_PROC_FS
278
279 static int typhoon_get_info(char *buf, char **start, off_t offset, int len)
280 {
281 char *out = buf;
282
283 #ifdef MODULE
284 #define MODULEPROCSTRING "Driver loaded as a module"
285 #else
286 #define MODULEPROCSTRING "Driver compiled into kernel"
287 #endif
288
289 /* output must be kept under PAGE_SIZE */
290 out += sprintf(out, BANNER);
291 out += sprintf(out, "Load type: " MODULEPROCSTRING "\n\n");
292 out += sprintf(out, "frequency = %lu kHz\n",
293 typhoon_unit.curfreq >> 4);
294 out += sprintf(out, "volume = %d\n", typhoon_unit.curvol);
295 out += sprintf(out, "mute = %s\n", typhoon_unit.muted ?
296 "on" : "off");
297 out += sprintf(out, "iobase = 0x%x\n", typhoon_unit.iobase);
298 out += sprintf(out, "mute frequency = %lu kHz\n",
299 typhoon_unit.mutefreq >> 4);
300 return out - buf;
301 }
302
303 #endif /* CONFIG_RADIO_TYPHOON_PROC_FS */
304
305 MODULE_AUTHOR("Dr. Henrik Seidel");
306 MODULE_DESCRIPTION("A driver for the Typhoon radio card (a.k.a. EcoRadio).");
307 MODULE_LICENSE("GPL");
308
309 static int io = -1;
310 static int radio_nr = -1;
311
312 module_param(io, int, 0);
313 MODULE_PARM_DESC(io, "I/O address of the Typhoon card (0x316 or 0x336)");
314 module_param(radio_nr, int, 0);
315
316 #ifdef MODULE
317 static unsigned long mutefreq = 0;
318 module_param(mutefreq, ulong, 0);
319 MODULE_PARM_DESC(mutefreq, "Frequency used when muting the card (in kHz)");
320 #endif
321
322 static int __init typhoon_init(void)
323 {
324 #ifdef MODULE
325 if (io == -1) {
326 printk(KERN_ERR "radio-typhoon: You must set an I/O address with io=0x316 or io=0x336\n");
327 return -EINVAL;
328 }
329 typhoon_unit.iobase = io;
330
331 if (mutefreq < 87000 || mutefreq > 108500) {
332 printk(KERN_ERR "radio-typhoon: You must set a frequency (in kHz) used when muting the card,\n");
333 printk(KERN_ERR "radio-typhoon: e.g. with \"mutefreq=87500\" (87000 <= mutefreq <= 108500)\n");
334 return -EINVAL;
335 }
336 typhoon_unit.mutefreq = mutefreq;
337 #endif /* MODULE */
338
339 printk(KERN_INFO BANNER);
340 mutex_init(&typhoon_unit.lock);
341 io = typhoon_unit.iobase;
342 if (!request_region(io, 8, "typhoon")) {
343 printk(KERN_ERR "radio-typhoon: port 0x%x already in use\n",
344 typhoon_unit.iobase);
345 return -EBUSY;
346 }
347
348 typhoon_radio.priv = &typhoon_unit;
349 if (video_register_device(&typhoon_radio, VFL_TYPE_RADIO, radio_nr) == -1)
350 {
351 release_region(io, 8);
352 return -EINVAL;
353 }
354 printk(KERN_INFO "radio-typhoon: port 0x%x.\n", typhoon_unit.iobase);
355 printk(KERN_INFO "radio-typhoon: mute frequency is %lu kHz.\n",
356 typhoon_unit.mutefreq);
357 typhoon_unit.mutefreq <<= 4;
358
359 /* mute card - prevents noisy bootups */
360 typhoon_mute(&typhoon_unit);
361
362 #ifdef CONFIG_RADIO_TYPHOON_PROC_FS
363 if (!create_proc_info_entry("driver/radio-typhoon", 0, NULL,
364 typhoon_get_info))
365 printk(KERN_ERR "radio-typhoon: registering /proc/driver/radio-typhoon failed\n");
366 #endif
367
368 return 0;
369 }
370
371 static void __exit typhoon_cleanup_module(void)
372 {
373
374 #ifdef CONFIG_RADIO_TYPHOON_PROC_FS
375 remove_proc_entry("driver/radio-typhoon", NULL);
376 #endif
377
378 video_unregister_device(&typhoon_radio);
379 release_region(io, 8);
380 }
381
382 module_init(typhoon_init);
383 module_exit(typhoon_cleanup_module);
384
385
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