Commit | Line | Data |
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34e49164 C |
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> /* check_region, 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 | }; | |
63 | ||
64 | static void typhoon_setvol_generic(struct typhoon_device *dev, int vol); | |
65 | static int typhoon_setfreq_generic(struct typhoon_device *dev, | |
66 | unsigned long frequency); | |
67 | static int typhoon_setfreq(struct typhoon_device *dev, unsigned long frequency); | |
68 | static void typhoon_mute(struct typhoon_device *dev); | |
69 | static void typhoon_unmute(struct typhoon_device *dev); | |
70 | static int typhoon_setvol(struct typhoon_device *dev, int vol); | |
71 | static int typhoon_ioctl(struct video_device *dev, unsigned int cmd, void *arg); | |
72 | static int typhoon_open(struct video_device *dev, int flags); | |
73 | static void typhoon_close(struct video_device *dev); | |
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 | vol >>= 14; /* Map 16 bit to 2 bit */ | |
81 | vol &= 3; | |
82 | outb_p(vol / 2, dev->iobase); /* Set the volume, high bit. */ | |
83 | outb_p(vol % 2, dev->iobase + 2); /* Set the volume, low bit. */ | |
84 | } | |
85 | ||
86 | static int typhoon_setfreq_generic(struct typhoon_device *dev, | |
87 | unsigned long frequency) | |
88 | { | |
89 | unsigned long outval; | |
90 | unsigned long x; | |
91 | ||
92 | /* | |
93 | * The frequency transfer curve is not linear. The best fit I could | |
94 | * get is | |
95 | * | |
96 | * outval = -155 + exp((f + 15.55) * 0.057)) | |
97 | * | |
98 | * where frequency f is in MHz. Since we don't have exp in the kernel, | |
99 | * I approximate this function by a third order polynomial. | |
100 | * | |
101 | */ | |
102 | ||
103 | x = frequency / 160; | |
104 | outval = (x * x + 2500) / 5000; | |
105 | outval = (outval * x + 5000) / 10000; | |
106 | outval -= (10 * x * x + 10433) / 20866; | |
107 | outval += 4 * x - 11505; | |
108 | ||
109 | outb_p((outval >> 8) & 0x01, dev->iobase + 4); | |
110 | outb_p(outval >> 9, dev->iobase + 6); | |
111 | outb_p(outval & 0xff, dev->iobase + 8); | |
112 | ||
113 | return 0; | |
114 | } | |
115 | ||
116 | static int typhoon_setfreq(struct typhoon_device *dev, unsigned long frequency) | |
117 | { | |
118 | typhoon_setfreq_generic(dev, frequency); | |
119 | dev->curfreq = frequency; | |
120 | return 0; | |
121 | } | |
122 | ||
123 | static void typhoon_mute(struct typhoon_device *dev) | |
124 | { | |
125 | if (dev->muted == 1) | |
126 | return; | |
127 | typhoon_setvol_generic(dev, 0); | |
128 | typhoon_setfreq_generic(dev, dev->mutefreq); | |
129 | dev->muted = 1; | |
130 | } | |
131 | ||
132 | static void typhoon_unmute(struct typhoon_device *dev) | |
133 | { | |
134 | if (dev->muted == 0) | |
135 | return; | |
136 | typhoon_setfreq_generic(dev, dev->curfreq); | |
137 | typhoon_setvol_generic(dev, dev->curvol); | |
138 | dev->muted = 0; | |
139 | } | |
140 | ||
141 | static int typhoon_setvol(struct typhoon_device *dev, int vol) | |
142 | { | |
143 | if (dev->muted && vol != 0) { /* user is unmuting the card */ | |
144 | dev->curvol = vol; | |
145 | typhoon_unmute(dev); | |
146 | return 0; | |
147 | } | |
148 | if (vol == dev->curvol) /* requested volume == current */ | |
149 | return 0; | |
150 | ||
151 | if (vol == 0) { /* volume == 0 means mute the card */ | |
152 | typhoon_mute(dev); | |
153 | dev->curvol = vol; | |
154 | return 0; | |
155 | } | |
156 | typhoon_setvol_generic(dev, vol); | |
157 | dev->curvol = vol; | |
158 | return 0; | |
159 | } | |
160 | ||
161 | ||
162 | static int typhoon_ioctl(struct video_device *dev, unsigned int cmd, void *arg) | |
163 | { | |
164 | struct typhoon_device *typhoon = dev->priv; | |
165 | ||
166 | switch (cmd) { | |
167 | case VIDIOCGCAP: | |
168 | { | |
169 | struct video_capability v; | |
170 | v.type = VID_TYPE_TUNER; | |
171 | v.channels = 1; | |
172 | v.audios = 1; | |
173 | /* No we don't do pictures */ | |
174 | v.maxwidth = 0; | |
175 | v.maxheight = 0; | |
176 | v.minwidth = 0; | |
177 | v.minheight = 0; | |
178 | strcpy(v.name, "Typhoon Radio"); | |
179 | if (copy_to_user(arg, &v, sizeof(v))) | |
180 | return -EFAULT; | |
181 | return 0; | |
182 | } | |
183 | case VIDIOCGTUNER: | |
184 | { | |
185 | struct video_tuner v; | |
186 | if (copy_from_user(&v, arg, sizeof(v)) != 0) | |
187 | return -EFAULT; | |
188 | if (v.tuner) /* Only 1 tuner */ | |
189 | return -EINVAL; | |
190 | v.rangelow = 875 * 1600; | |
191 | v.rangehigh = 1080 * 1600; | |
192 | v.flags = VIDEO_TUNER_LOW; | |
193 | v.mode = VIDEO_MODE_AUTO; | |
194 | v.signal = 0xFFFF; /* We can't get the signal strength */ | |
195 | strcpy(v.name, "FM"); | |
196 | if (copy_to_user(arg, &v, sizeof(v))) | |
197 | return -EFAULT; | |
198 | return 0; | |
199 | } | |
200 | case VIDIOCSTUNER: | |
201 | { | |
202 | struct video_tuner v; | |
203 | if (copy_from_user(&v, arg, sizeof(v))) | |
204 | return -EFAULT; | |
205 | if (v.tuner != 0) | |
206 | return -EINVAL; | |
207 | /* Only 1 tuner so no setting needed ! */ | |
208 | return 0; | |
209 | } | |
210 | case VIDIOCGFREQ: | |
211 | if (copy_to_user(arg, &typhoon->curfreq, | |
212 | sizeof(typhoon->curfreq))) | |
213 | return -EFAULT; | |
214 | return 0; | |
215 | case VIDIOCSFREQ: | |
216 | if (copy_from_user(&typhoon->curfreq, arg, | |
217 | sizeof(typhoon->curfreq))) | |
218 | return -EFAULT; | |
219 | typhoon_setfreq(typhoon, typhoon->curfreq); | |
220 | return 0; | |
221 | case VIDIOCGAUDIO: | |
222 | { | |
223 | struct video_audio v; | |
224 | memset(&v, 0, sizeof(v)); | |
225 | v.flags |= VIDEO_AUDIO_MUTABLE | VIDEO_AUDIO_VOLUME; | |
226 | v.mode |= VIDEO_SOUND_MONO; | |
227 | v.volume = typhoon->curvol; | |
228 | v.step = 1 << 14; | |
229 | strcpy(v.name, "Typhoon Radio"); | |
230 | if (copy_to_user(arg, &v, sizeof(v))) | |
231 | return -EFAULT; | |
232 | return 0; | |
233 | } | |
234 | case VIDIOCSAUDIO: | |
235 | { | |
236 | struct video_audio v; | |
237 | if (copy_from_user(&v, arg, sizeof(v))) | |
238 | return -EFAULT; | |
239 | if (v.audio) | |
240 | return -EINVAL; | |
241 | ||
242 | if (v.flags & VIDEO_AUDIO_MUTE) | |
243 | typhoon_mute(typhoon); | |
244 | else | |
245 | typhoon_unmute(typhoon); | |
246 | ||
247 | if (v.flags & VIDEO_AUDIO_VOLUME) | |
248 | typhoon_setvol(typhoon, v.volume); | |
249 | ||
250 | return 0; | |
251 | } | |
252 | default: | |
253 | return -ENOIOCTLCMD; | |
254 | } | |
255 | } | |
256 | ||
257 | static int typhoon_open(struct video_device *dev, int flags) | |
258 | { | |
259 | struct typhoon_device *typhoon = dev->priv; | |
260 | if (typhoon->users) | |
261 | return -EBUSY; | |
262 | typhoon->users++; | |
263 | return 0; | |
264 | } | |
265 | ||
266 | static void typhoon_close(struct video_device *dev) | |
267 | { | |
268 | struct typhoon_device *typhoon = dev->priv; | |
269 | typhoon->users--; | |
270 | } | |
271 | ||
272 | static struct typhoon_device typhoon_unit = | |
273 | { | |
274 | iobase: CONFIG_RADIO_TYPHOON_PORT, | |
275 | curfreq: CONFIG_RADIO_TYPHOON_MUTEFREQ, | |
276 | mutefreq: CONFIG_RADIO_TYPHOON_MUTEFREQ, | |
277 | }; | |
278 | ||
279 | static struct video_device typhoon_radio = | |
280 | { | |
281 | owner: THIS_MODULE, | |
282 | name: "Typhoon Radio", | |
283 | type: VID_TYPE_TUNER, | |
284 | hardware: VID_HARDWARE_TYPHOON, | |
285 | open: typhoon_open, | |
286 | close: typhoon_close, | |
287 | ioctl: typhoon_ioctl, | |
288 | }; | |
289 | ||
290 | #ifdef CONFIG_RADIO_TYPHOON_PROC_FS | |
291 | ||
292 | static int typhoon_get_info(char *buf, char **start, off_t offset, int len) | |
293 | { | |
294 | char *out = buf; | |
295 | ||
296 | #ifdef MODULE | |
297 | #define MODULEPROCSTRING "Driver loaded as a module" | |
298 | #else | |
299 | #define MODULEPROCSTRING "Driver compiled into kernel" | |
300 | #endif | |
301 | ||
302 | /* output must be kept under PAGE_SIZE */ | |
303 | out += sprintf(out, BANNER); | |
304 | out += sprintf(out, "Load type: " MODULEPROCSTRING "\n\n"); | |
305 | out += sprintf(out, "frequency = %lu kHz\n", | |
306 | typhoon_unit.curfreq >> 4); | |
307 | out += sprintf(out, "volume = %d\n", typhoon_unit.curvol); | |
308 | out += sprintf(out, "mute = %s\n", typhoon_unit.muted ? | |
309 | "on" : "off"); | |
310 | out += sprintf(out, "iobase = 0x%x\n", typhoon_unit.iobase); | |
311 | out += sprintf(out, "mute frequency = %lu kHz\n", | |
312 | typhoon_unit.mutefreq >> 4); | |
313 | return out - buf; | |
314 | } | |
315 | ||
316 | #endif /* CONFIG_RADIO_TYPHOON_PROC_FS */ | |
317 | ||
318 | MODULE_AUTHOR("Dr. Henrik Seidel"); | |
319 | MODULE_DESCRIPTION("A driver for the Typhoon radio card (a.k.a. EcoRadio)."); | |
320 | MODULE_LICENSE("GPL"); | |
321 | ||
322 | MODULE_PARM(io, "i"); | |
323 | MODULE_PARM_DESC(io, "I/O address of the Typhoon card (0x316 or 0x336)"); | |
324 | MODULE_PARM(mutefreq, "i"); | |
325 | MODULE_PARM_DESC(mutefreq, "Frequency used when muting the card (in kHz)"); | |
326 | MODULE_PARM(radio_nr, "i"); | |
327 | ||
328 | EXPORT_NO_SYMBOLS; | |
329 | ||
330 | static int io = -1; | |
331 | static int radio_nr = -1; | |
332 | ||
333 | #ifdef MODULE | |
334 | static unsigned long mutefreq = 0; | |
335 | #endif | |
336 | ||
337 | static int __init typhoon_init(void) | |
338 | { | |
339 | #ifdef MODULE | |
340 | if (io == -1) { | |
341 | printk(KERN_ERR "radio-typhoon: You must set an I/O address with io=0x316 or io=0x336\n"); | |
342 | return -EINVAL; | |
343 | } | |
344 | typhoon_unit.iobase = io; | |
345 | ||
346 | if (mutefreq < 87000 || mutefreq > 108500) { | |
347 | printk(KERN_ERR "radio-typhoon: You must set a frequency (in kHz) used when muting the card,\n"); | |
348 | printk(KERN_ERR "radio-typhoon: e.g. with \"mutefreq=87500\" (87000 <= mutefreq <= 108500)\n"); | |
349 | return -EINVAL; | |
350 | } | |
351 | typhoon_unit.mutefreq = mutefreq; | |
352 | #endif /* MODULE */ | |
353 | ||
354 | printk(KERN_INFO BANNER); | |
355 | io = typhoon_unit.iobase; | |
356 | if (!request_region(io, 8, "typhoon")) { | |
357 | printk(KERN_ERR "radio-typhoon: port 0x%x already in use\n", | |
358 | typhoon_unit.iobase); | |
359 | return -EBUSY; | |
360 | } | |
361 | ||
362 | typhoon_radio.priv = &typhoon_unit; | |
363 | if (video_register_device(&typhoon_radio, VFL_TYPE_RADIO, radio_nr) == -1) | |
364 | { | |
365 | release_region(io, 8); | |
366 | return -EINVAL; | |
367 | } | |
368 | printk(KERN_INFO "radio-typhoon: port 0x%x.\n", typhoon_unit.iobase); | |
369 | printk(KERN_INFO "radio-typhoon: mute frequency is %lu kHz.\n", | |
370 | typhoon_unit.mutefreq); | |
371 | typhoon_unit.mutefreq <<= 4; | |
372 | ||
373 | /* mute card - prevents noisy bootups */ | |
374 | typhoon_mute(&typhoon_unit); | |
375 | ||
376 | #ifdef CONFIG_RADIO_TYPHOON_PROC_FS | |
377 | if (!create_proc_info_entry("driver/radio-typhoon", 0, NULL, | |
378 | typhoon_get_info)) | |
379 | printk(KERN_ERR "radio-typhoon: registering /proc/driver/radio-typhoon failed\n"); | |
380 | #endif | |
381 | ||
382 | return 0; | |
383 | } | |
384 | ||
385 | static void __exit typhoon_cleanup_module(void) | |
386 | { | |
387 | ||
388 | #ifdef CONFIG_RADIO_TYPHOON_PROC_FS | |
389 | remove_proc_entry("driver/radio-typhoon", NULL); | |
390 | #endif | |
391 | ||
392 | video_unregister_device(&typhoon_radio); | |
393 | release_region(io, 8); | |
394 | } | |
395 | ||
396 | module_init(typhoon_init); | |
397 | module_exit(typhoon_cleanup_module); | |
398 |