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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* 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 */
Peter Osterlundfb911ee2005-09-13 01:25:15 -070032#include <linux/ioport.h> /* request_region */
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#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
44static int io = CONFIG_RADIO_RTRACK_PORT;
45static int radio_nr = -1;
46static struct semaphore lock;
47
48struct rt_device
49{
50 int port;
51 int curvol;
52 unsigned long curfreq;
53 int muted;
54};
55
56
57/* local things */
58
59static 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
69static 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
76static 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
83static 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
91static 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
133static 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
146static 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
160static 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
204static 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
211static 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
289static 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
295static struct rt_device rtrack_unit;
296
297static struct file_operations rtrack_fops = {
298 .owner = THIS_MODULE,
299 .open = video_exclusive_open,
300 .release = video_exclusive_release,
301 .ioctl = rt_ioctl,
302 .llseek = no_llseek,
303};
304
305static struct video_device rtrack_radio=
306{
307 .owner = THIS_MODULE,
308 .name = "RadioTrack radio",
309 .type = VID_TYPE_TUNER,
310 .hardware = VID_HARDWARE_RTRACK,
311 .fops = &rtrack_fops,
312};
313
314static int __init rtrack_init(void)
315{
316 if(io==-1)
317 {
318 printk(KERN_ERR "You must set an I/O address with io=0x???\n");
319 return -EINVAL;
320 }
321
322 if (!request_region(io, 2, "rtrack"))
323 {
324 printk(KERN_ERR "rtrack: port 0x%x already in use\n", io);
325 return -EBUSY;
326 }
327
328 rtrack_radio.priv=&rtrack_unit;
329
330 if(video_register_device(&rtrack_radio, VFL_TYPE_RADIO, radio_nr)==-1)
331 {
332 release_region(io, 2);
333 return -EINVAL;
334 }
335 printk(KERN_INFO "AIMSlab RadioTrack/RadioReveal card driver.\n");
336
337 /* Set up the I/O locking */
338
339 init_MUTEX(&lock);
340
341 /* mute card - prevents noisy bootups */
342
343 /* this ensures that the volume is all the way down */
344 outb(0x48, io); /* volume down but still "on" */
345 sleep_delay(2000000); /* make sure it's totally down */
346 outb(0xc0, io); /* steady volume, mute card */
347 rtrack_unit.curvol = 0;
348
349 return 0;
350}
351
352MODULE_AUTHOR("M.Kirkwood");
353MODULE_DESCRIPTION("A driver for the RadioTrack/RadioReveal radio card.");
354MODULE_LICENSE("GPL");
355
356module_param(io, int, 0);
357MODULE_PARM_DESC(io, "I/O address of the RadioTrack card (0x20f or 0x30f)");
358module_param(radio_nr, int, 0);
359
360static void __exit cleanup_rtrack_module(void)
361{
362 video_unregister_device(&rtrack_radio);
363 release_region(io,2);
364}
365
366module_init(rtrack_init);
367module_exit(cleanup_rtrack_module);
368