Commit | Line | Data |
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1da177e4 LT |
1 | /* radiotrack (radioreveal) driver for Linux radio support |
2 | * (c) 1997 M. Kirkwood | |
3 | * Converted to new API by Alan Cox <Alan.Cox@linux.org> | |
4 | * Various bugfixes and enhancements by Russell Kroll <rkroll@exploits.org> | |
5 | * | |
6 | * History: | |
7 | * 1999-02-24 Russell Kroll <rkroll@exploits.org> | |
8 | * Fine tuning/VIDEO_TUNER_LOW | |
9 | * Frequency range expanded to start at 87 MHz | |
10 | * | |
11 | * TODO: Allow for more than one of these foolish entities :-) | |
12 | * | |
13 | * Notes on the hardware (reverse engineered from other peoples' | |
14 | * reverse engineering of AIMS' code :-) | |
15 | * | |
16 | * Frequency control is done digitally -- ie out(port,encodefreq(95.8)); | |
17 | * | |
18 | * The signal strength query is unsurprisingly inaccurate. And it seems | |
19 | * to indicate that (on my card, at least) the frequency setting isn't | |
20 | * too great. (I have to tune up .025MHz from what the freq should be | |
21 | * to get a report that the thing is tuned.) | |
22 | * | |
23 | * Volume control is (ugh) analogue: | |
24 | * out(port, start_increasing_volume); | |
25 | * wait(a_wee_while); | |
26 | * out(port, stop_changing_the_volume); | |
27 | * | |
28 | */ | |
29 | ||
30 | #include <linux/module.h> /* Modules */ | |
31 | #include <linux/init.h> /* Initdata */ | |
fb911ee8 | 32 | #include <linux/ioport.h> /* request_region */ |
1da177e4 LT |
33 | #include <linux/delay.h> /* udelay */ |
34 | #include <asm/io.h> /* outb, outb_p */ | |
35 | #include <asm/uaccess.h> /* copy to/from user */ | |
36 | #include <linux/videodev.h> /* kernel radio structs */ | |
37 | #include <linux/config.h> /* CONFIG_RADIO_RTRACK_PORT */ | |
38 | #include <asm/semaphore.h> /* Lock for the I/O */ | |
39 | ||
40 | #ifndef CONFIG_RADIO_RTRACK_PORT | |
41 | #define CONFIG_RADIO_RTRACK_PORT -1 | |
42 | #endif | |
43 | ||
44 | static int io = CONFIG_RADIO_RTRACK_PORT; | |
45 | static int radio_nr = -1; | |
46 | static struct semaphore lock; | |
47 | ||
48 | struct rt_device | |
49 | { | |
50 | int port; | |
51 | int curvol; | |
52 | unsigned long curfreq; | |
53 | int muted; | |
54 | }; | |
55 | ||
56 | ||
57 | /* local things */ | |
58 | ||
59 | static void sleep_delay(long n) | |
60 | { | |
61 | /* Sleep nicely for 'n' uS */ | |
62 | int d=n/(1000000/HZ); | |
63 | if(!d) | |
64 | udelay(n); | |
65 | else | |
66 | msleep(jiffies_to_msecs(d)); | |
67 | } | |
68 | ||
69 | static void rt_decvol(void) | |
70 | { | |
71 | outb(0x58, io); /* volume down + sigstr + on */ | |
72 | sleep_delay(100000); | |
73 | outb(0xd8, io); /* volume steady + sigstr + on */ | |
74 | } | |
75 | ||
76 | static void rt_incvol(void) | |
77 | { | |
78 | outb(0x98, io); /* volume up + sigstr + on */ | |
79 | sleep_delay(100000); | |
80 | outb(0xd8, io); /* volume steady + sigstr + on */ | |
81 | } | |
82 | ||
83 | static void rt_mute(struct rt_device *dev) | |
84 | { | |
85 | dev->muted = 1; | |
86 | down(&lock); | |
87 | outb(0xd0, io); /* volume steady, off */ | |
88 | up(&lock); | |
89 | } | |
90 | ||
91 | static int rt_setvol(struct rt_device *dev, int vol) | |
92 | { | |
93 | int i; | |
94 | ||
95 | down(&lock); | |
96 | ||
97 | if(vol == dev->curvol) { /* requested volume = current */ | |
98 | if (dev->muted) { /* user is unmuting the card */ | |
99 | dev->muted = 0; | |
100 | outb (0xd8, io); /* enable card */ | |
101 | } | |
102 | up(&lock); | |
103 | return 0; | |
104 | } | |
105 | ||
106 | if(vol == 0) { /* volume = 0 means mute the card */ | |
107 | outb(0x48, io); /* volume down but still "on" */ | |
108 | sleep_delay(2000000); /* make sure it's totally down */ | |
109 | outb(0xd0, io); /* volume steady, off */ | |
110 | dev->curvol = 0; /* track the volume state! */ | |
111 | up(&lock); | |
112 | return 0; | |
113 | } | |
114 | ||
115 | dev->muted = 0; | |
116 | if(vol > dev->curvol) | |
117 | for(i = dev->curvol; i < vol; i++) | |
118 | rt_incvol(); | |
119 | else | |
120 | for(i = dev->curvol; i > vol; i--) | |
121 | rt_decvol(); | |
122 | ||
123 | dev->curvol = vol; | |
124 | up(&lock); | |
125 | return 0; | |
126 | } | |
127 | ||
128 | /* the 128+64 on these outb's is to keep the volume stable while tuning | |
129 | * without them, the volume _will_ creep up with each frequency change | |
130 | * and bit 4 (+16) is to keep the signal strength meter enabled | |
131 | */ | |
132 | ||
133 | static void send_0_byte(int port, struct rt_device *dev) | |
134 | { | |
135 | if ((dev->curvol == 0) || (dev->muted)) { | |
136 | outb_p(128+64+16+ 1, port); /* wr-enable + data low */ | |
137 | outb_p(128+64+16+2+1, port); /* clock */ | |
138 | } | |
139 | else { | |
140 | outb_p(128+64+16+8+ 1, port); /* on + wr-enable + data low */ | |
141 | outb_p(128+64+16+8+2+1, port); /* clock */ | |
142 | } | |
143 | sleep_delay(1000); | |
144 | } | |
145 | ||
146 | static void send_1_byte(int port, struct rt_device *dev) | |
147 | { | |
148 | if ((dev->curvol == 0) || (dev->muted)) { | |
149 | outb_p(128+64+16+4 +1, port); /* wr-enable+data high */ | |
150 | outb_p(128+64+16+4+2+1, port); /* clock */ | |
151 | } | |
152 | else { | |
153 | outb_p(128+64+16+8+4 +1, port); /* on+wr-enable+data high */ | |
154 | outb_p(128+64+16+8+4+2+1, port); /* clock */ | |
155 | } | |
156 | ||
157 | sleep_delay(1000); | |
158 | } | |
159 | ||
160 | static int rt_setfreq(struct rt_device *dev, unsigned long freq) | |
161 | { | |
162 | int i; | |
163 | ||
164 | /* adapted from radio-aztech.c */ | |
165 | ||
166 | /* now uses VIDEO_TUNER_LOW for fine tuning */ | |
167 | ||
168 | freq += 171200; /* Add 10.7 MHz IF */ | |
169 | freq /= 800; /* Convert to 50 kHz units */ | |
170 | ||
171 | down(&lock); /* Stop other ops interfering */ | |
172 | ||
173 | send_0_byte (io, dev); /* 0: LSB of frequency */ | |
174 | ||
175 | for (i = 0; i < 13; i++) /* : frequency bits (1-13) */ | |
176 | if (freq & (1 << i)) | |
177 | send_1_byte (io, dev); | |
178 | else | |
179 | send_0_byte (io, dev); | |
180 | ||
181 | send_0_byte (io, dev); /* 14: test bit - always 0 */ | |
182 | send_0_byte (io, dev); /* 15: test bit - always 0 */ | |
183 | ||
184 | send_0_byte (io, dev); /* 16: band data 0 - always 0 */ | |
185 | send_0_byte (io, dev); /* 17: band data 1 - always 0 */ | |
186 | send_0_byte (io, dev); /* 18: band data 2 - always 0 */ | |
187 | send_0_byte (io, dev); /* 19: time base - always 0 */ | |
188 | ||
189 | send_0_byte (io, dev); /* 20: spacing (0 = 25 kHz) */ | |
190 | send_1_byte (io, dev); /* 21: spacing (1 = 25 kHz) */ | |
191 | send_0_byte (io, dev); /* 22: spacing (0 = 25 kHz) */ | |
192 | send_1_byte (io, dev); /* 23: AM/FM (FM = 1, always) */ | |
193 | ||
194 | if ((dev->curvol == 0) || (dev->muted)) | |
195 | outb (0xd0, io); /* volume steady + sigstr */ | |
196 | else | |
197 | outb (0xd8, io); /* volume steady + sigstr + on */ | |
198 | ||
199 | up(&lock); | |
200 | ||
201 | return 0; | |
202 | } | |
203 | ||
204 | static int rt_getsigstr(struct rt_device *dev) | |
205 | { | |
206 | if (inb(io) & 2) /* bit set = no signal present */ | |
207 | return 0; | |
208 | return 1; /* signal present */ | |
209 | } | |
210 | ||
211 | static int rt_do_ioctl(struct inode *inode, struct file *file, | |
212 | unsigned int cmd, void *arg) | |
213 | { | |
214 | struct video_device *dev = video_devdata(file); | |
215 | struct rt_device *rt=dev->priv; | |
216 | ||
217 | switch(cmd) | |
218 | { | |
219 | case VIDIOCGCAP: | |
220 | { | |
221 | struct video_capability *v = arg; | |
222 | memset(v,0,sizeof(*v)); | |
223 | v->type=VID_TYPE_TUNER; | |
224 | v->channels=1; | |
225 | v->audios=1; | |
226 | strcpy(v->name, "RadioTrack"); | |
227 | return 0; | |
228 | } | |
229 | case VIDIOCGTUNER: | |
230 | { | |
231 | struct video_tuner *v = arg; | |
232 | if(v->tuner) /* Only 1 tuner */ | |
233 | return -EINVAL; | |
234 | v->rangelow=(87*16000); | |
235 | v->rangehigh=(108*16000); | |
236 | v->flags=VIDEO_TUNER_LOW; | |
237 | v->mode=VIDEO_MODE_AUTO; | |
238 | strcpy(v->name, "FM"); | |
239 | v->signal=0xFFFF*rt_getsigstr(rt); | |
240 | return 0; | |
241 | } | |
242 | case VIDIOCSTUNER: | |
243 | { | |
244 | struct video_tuner *v = arg; | |
245 | if(v->tuner!=0) | |
246 | return -EINVAL; | |
247 | /* Only 1 tuner so no setting needed ! */ | |
248 | return 0; | |
249 | } | |
250 | case VIDIOCGFREQ: | |
251 | { | |
252 | unsigned long *freq = arg; | |
253 | *freq = rt->curfreq; | |
254 | return 0; | |
255 | } | |
256 | case VIDIOCSFREQ: | |
257 | { | |
258 | unsigned long *freq = arg; | |
259 | rt->curfreq = *freq; | |
260 | rt_setfreq(rt, rt->curfreq); | |
261 | return 0; | |
262 | } | |
263 | case VIDIOCGAUDIO: | |
264 | { | |
265 | struct video_audio *v = arg; | |
266 | memset(v,0, sizeof(*v)); | |
267 | v->flags|=VIDEO_AUDIO_MUTABLE|VIDEO_AUDIO_VOLUME; | |
268 | v->volume=rt->curvol * 6554; | |
269 | v->step=6554; | |
270 | strcpy(v->name, "Radio"); | |
271 | return 0; | |
272 | } | |
273 | case VIDIOCSAUDIO: | |
274 | { | |
275 | struct video_audio *v = arg; | |
276 | if(v->audio) | |
277 | return -EINVAL; | |
278 | if(v->flags&VIDEO_AUDIO_MUTE) | |
279 | rt_mute(rt); | |
280 | else | |
281 | rt_setvol(rt,v->volume/6554); | |
282 | return 0; | |
283 | } | |
284 | default: | |
285 | return -ENOIOCTLCMD; | |
286 | } | |
287 | } | |
288 | ||
289 | static int rt_ioctl(struct inode *inode, struct file *file, | |
290 | unsigned int cmd, unsigned long arg) | |
291 | { | |
292 | return video_usercopy(inode, file, cmd, arg, rt_do_ioctl); | |
293 | } | |
294 | ||
295 | static struct rt_device rtrack_unit; | |
296 | ||
297 | static struct file_operations rtrack_fops = { | |
298 | .owner = THIS_MODULE, | |
299 | .open = video_exclusive_open, | |
300 | .release = video_exclusive_release, | |
301 | .ioctl = rt_ioctl, | |
0d0fbf81 | 302 | .compat_ioctl = v4l_compat_ioctl32, |
1da177e4 LT |
303 | .llseek = no_llseek, |
304 | }; | |
305 | ||
306 | static struct video_device rtrack_radio= | |
307 | { | |
308 | .owner = THIS_MODULE, | |
309 | .name = "RadioTrack radio", | |
310 | .type = VID_TYPE_TUNER, | |
311 | .hardware = VID_HARDWARE_RTRACK, | |
312 | .fops = &rtrack_fops, | |
313 | }; | |
314 | ||
315 | static int __init rtrack_init(void) | |
316 | { | |
317 | if(io==-1) | |
318 | { | |
319 | printk(KERN_ERR "You must set an I/O address with io=0x???\n"); | |
320 | return -EINVAL; | |
321 | } | |
322 | ||
323 | if (!request_region(io, 2, "rtrack")) | |
324 | { | |
325 | printk(KERN_ERR "rtrack: port 0x%x already in use\n", io); | |
326 | return -EBUSY; | |
327 | } | |
328 | ||
329 | rtrack_radio.priv=&rtrack_unit; | |
330 | ||
331 | if(video_register_device(&rtrack_radio, VFL_TYPE_RADIO, radio_nr)==-1) | |
332 | { | |
333 | release_region(io, 2); | |
334 | return -EINVAL; | |
335 | } | |
336 | printk(KERN_INFO "AIMSlab RadioTrack/RadioReveal card driver.\n"); | |
337 | ||
338 | /* Set up the I/O locking */ | |
339 | ||
340 | init_MUTEX(&lock); | |
341 | ||
342 | /* mute card - prevents noisy bootups */ | |
343 | ||
344 | /* this ensures that the volume is all the way down */ | |
345 | outb(0x48, io); /* volume down but still "on" */ | |
346 | sleep_delay(2000000); /* make sure it's totally down */ | |
347 | outb(0xc0, io); /* steady volume, mute card */ | |
348 | rtrack_unit.curvol = 0; | |
349 | ||
350 | return 0; | |
351 | } | |
352 | ||
353 | MODULE_AUTHOR("M.Kirkwood"); | |
354 | MODULE_DESCRIPTION("A driver for the RadioTrack/RadioReveal radio card."); | |
355 | MODULE_LICENSE("GPL"); | |
356 | ||
357 | module_param(io, int, 0); | |
358 | MODULE_PARM_DESC(io, "I/O address of the RadioTrack card (0x20f or 0x30f)"); | |
359 | module_param(radio_nr, int, 0); | |
360 | ||
361 | static void __exit cleanup_rtrack_module(void) | |
362 | { | |
363 | video_unregister_device(&rtrack_radio); | |
364 | release_region(io,2); | |
365 | } | |
366 | ||
367 | module_init(rtrack_init); | |
368 | module_exit(cleanup_rtrack_module); | |
369 |