1 /* radiotrack (radioreveal) driver for Linux radio support
3 * Converted to new API by Alan Cox <Alan.Cox@linux.org>
4 * Various bugfixes and enhancements by Russell Kroll <rkroll@exploits.org>
7 * 1999-02-24 Russell Kroll <rkroll@exploits.org>
8 * Fine tuning/VIDEO_TUNER_LOW
9 * Frequency range expanded to start at 87 MHz
11 * TODO: Allow for more than one of these foolish entities :-)
13 * Notes on the hardware (reverse engineered from other peoples'
14 * reverse engineering of AIMS' code :-)
16 * Frequency control is done digitally -- ie out(port,encodefreq(95.8));
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.)
23 * Volume control is (ugh) analogue:
24 * out(port, start_increasing_volume);
26 * out(port, stop_changing_the_volume);
30 #include <linux/module.h> /* Modules */
31 #include <linux/init.h> /* Initdata */
32 #include <linux/ioport.h> /* check_region, request_region */
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 */
40 #ifndef CONFIG_RADIO_RTRACK_PORT
41 #define CONFIG_RADIO_RTRACK_PORT -1
44 static int io = CONFIG_RADIO_RTRACK_PORT;
45 static int radio_nr = -1;
46 static struct semaphore lock;
52 unsigned long curfreq;
59 static void sleep_delay(long n)
61 /* Sleep nicely for 'n' uS */
68 unsigned long x=jiffies;
74 static void rt_decvol(void)
76 outb(0x58, io); /* volume down + sigstr + on */
78 outb(0xd8, io); /* volume steady + sigstr + on */
81 static void rt_incvol(void)
83 outb(0x98, io); /* volume up + sigstr + on */
85 outb(0xd8, io); /* volume steady + sigstr + on */
88 static void rt_mute(struct rt_device *dev)
92 outb(0xd0, io); /* volume steady, off */
96 static int rt_setvol(struct rt_device *dev, int vol)
102 if(vol == dev->curvol) { /* requested volume = current */
103 if (dev->muted) { /* user is unmuting the card */
105 outb (0xd8, io); /* enable card */
111 if(vol == 0) { /* volume = 0 means mute the card */
112 outb(0x48, io); /* volume down but still "on" */
113 sleep_delay(2000000); /* make sure it's totally down */
114 outb(0xd0, io); /* volume steady, off */
115 dev->curvol = 0; /* track the volume state! */
121 if(vol > dev->curvol)
122 for(i = dev->curvol; i < vol; i++)
125 for(i = dev->curvol; i > vol; i--)
133 /* the 128+64 on these outb's is to keep the volume stable while tuning
134 * without them, the volume _will_ creep up with each frequency change
135 * and bit 4 (+16) is to keep the signal strength meter enabled
138 void send_0_byte(int port, struct rt_device *dev)
140 if ((dev->curvol == 0) || (dev->muted)) {
141 outb_p(128+64+16+ 1, port); /* wr-enable + data low */
142 outb_p(128+64+16+2+1, port); /* clock */
145 outb_p(128+64+16+8+ 1, port); /* on + wr-enable + data low */
146 outb_p(128+64+16+8+2+1, port); /* clock */
151 void send_1_byte(int port, struct rt_device *dev)
153 if ((dev->curvol == 0) || (dev->muted)) {
154 outb_p(128+64+16+4 +1, port); /* wr-enable+data high */
155 outb_p(128+64+16+4+2+1, port); /* clock */
158 outb_p(128+64+16+8+4 +1, port); /* on+wr-enable+data high */
159 outb_p(128+64+16+8+4+2+1, port); /* clock */
165 static int rt_setfreq(struct rt_device *dev, unsigned long freq)
169 /* adapted from radio-aztech.c */
171 /* now uses VIDEO_TUNER_LOW for fine tuning */
173 freq += 171200; /* Add 10.7 MHz IF */
174 freq /= 800; /* Convert to 50 kHz units */
176 down(&lock); /* Stop other ops interfering */
178 send_0_byte (io, dev); /* 0: LSB of frequency */
180 for (i = 0; i < 13; i++) /* : frequency bits (1-13) */
182 send_1_byte (io, dev);
184 send_0_byte (io, dev);
186 send_0_byte (io, dev); /* 14: test bit - always 0 */
187 send_0_byte (io, dev); /* 15: test bit - always 0 */
189 send_0_byte (io, dev); /* 16: band data 0 - always 0 */
190 send_0_byte (io, dev); /* 17: band data 1 - always 0 */
191 send_0_byte (io, dev); /* 18: band data 2 - always 0 */
192 send_0_byte (io, dev); /* 19: time base - always 0 */
194 send_0_byte (io, dev); /* 20: spacing (0 = 25 kHz) */
195 send_1_byte (io, dev); /* 21: spacing (1 = 25 kHz) */
196 send_0_byte (io, dev); /* 22: spacing (0 = 25 kHz) */
197 send_1_byte (io, dev); /* 23: AM/FM (FM = 1, always) */
199 if ((dev->curvol == 0) || (dev->muted))
200 outb (0xd0, io); /* volume steady + sigstr */
202 outb (0xd8, io); /* volume steady + sigstr + on */
209 static int rt_getsigstr(struct rt_device *dev)
211 if (inb(io) & 2) /* bit set = no signal present */
213 return 1; /* signal present */
216 static int rt_do_ioctl(struct inode *inode, struct file *file,
217 unsigned int cmd, void *arg)
219 struct video_device *dev = video_devdata(file);
220 struct rt_device *rt=dev->priv;
226 struct video_capability *v = arg;
227 memset(v,0,sizeof(*v));
228 v->type=VID_TYPE_TUNER;
231 strcpy(v->name, "RadioTrack");
236 struct video_tuner *v = arg;
237 if(v->tuner) /* Only 1 tuner */
239 v->rangelow=(87*16000);
240 v->rangehigh=(108*16000);
241 v->flags=VIDEO_TUNER_LOW;
242 v->mode=VIDEO_MODE_AUTO;
243 strcpy(v->name, "FM");
244 v->signal=0xFFFF*rt_getsigstr(rt);
249 struct video_tuner *v = arg;
252 /* Only 1 tuner so no setting needed ! */
257 unsigned long *freq = arg;
263 unsigned long *freq = arg;
265 rt_setfreq(rt, rt->curfreq);
270 struct video_audio *v = arg;
271 memset(v,0, sizeof(*v));
272 v->flags|=VIDEO_AUDIO_MUTABLE|VIDEO_AUDIO_VOLUME;
273 v->volume=rt->curvol * 6554;
275 strcpy(v->name, "Radio");
280 struct video_audio *v = arg;
283 if(v->flags&VIDEO_AUDIO_MUTE)
286 rt_setvol(rt,v->volume/6554);
294 static int rt_ioctl(struct inode *inode, struct file *file,
295 unsigned int cmd, unsigned long arg)
297 return video_usercopy(inode, file, cmd, arg, rt_do_ioctl);
300 static struct rt_device rtrack_unit;
302 static struct file_operations rtrack_fops = {
303 .owner = THIS_MODULE,
304 .open = video_exclusive_open,
305 .release = video_exclusive_release,
310 static struct video_device rtrack_radio=
312 .owner = THIS_MODULE,
313 .name = "RadioTrack radio",
314 .type = VID_TYPE_TUNER,
315 .hardware = VID_HARDWARE_RTRACK,
316 .fops = &rtrack_fops,
319 static int __init rtrack_init(void)
323 printk(KERN_ERR "You must set an I/O address with io=0x???\n");
327 if (!request_region(io, 2, "rtrack"))
329 printk(KERN_ERR "rtrack: port 0x%x already in use\n", io);
333 rtrack_radio.priv=&rtrack_unit;
335 if(video_register_device(&rtrack_radio, VFL_TYPE_RADIO, radio_nr)==-1)
337 release_region(io, 2);
340 printk(KERN_INFO "AIMSlab RadioTrack/RadioReveal card driver.\n");
342 /* Set up the I/O locking */
346 /* mute card - prevents noisy bootups */
348 /* this ensures that the volume is all the way down */
349 outb(0x48, io); /* volume down but still "on" */
350 sleep_delay(2000000); /* make sure it's totally down */
351 outb(0xc0, io); /* steady volume, mute card */
352 rtrack_unit.curvol = 0;
357 MODULE_AUTHOR("M.Kirkwood");
358 MODULE_DESCRIPTION("A driver for the RadioTrack/RadioReveal radio card.");
359 MODULE_LICENSE("GPL");
361 MODULE_PARM(io, "i");
362 MODULE_PARM_DESC(io, "I/O address of the RadioTrack card (0x20f or 0x30f)");
363 MODULE_PARM(radio_nr, "i");
365 static void __exit cleanup_rtrack_module(void)
367 video_unregister_device(&rtrack_radio);
368 release_region(io,2);
371 module_init(rtrack_init);
372 module_exit(cleanup_rtrack_module);