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> /* 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 <media/v4l2-common.h>
38 #include <linux/config.h> /* CONFIG_RADIO_RTRACK_PORT */
39 #include <asm/semaphore.h> /* Lock for the I/O */
41 #ifndef CONFIG_RADIO_RTRACK_PORT
42 #define CONFIG_RADIO_RTRACK_PORT -1
45 static int io = CONFIG_RADIO_RTRACK_PORT;
46 static int radio_nr = -1;
47 static struct mutex lock;
53 unsigned long curfreq;
60 static void sleep_delay(long n)
62 /* Sleep nicely for 'n' uS */
67 msleep(jiffies_to_msecs(d));
70 static void rt_decvol(void)
72 outb(0x58, io); /* volume down + sigstr + on */
74 outb(0xd8, io); /* volume steady + sigstr + on */
77 static void rt_incvol(void)
79 outb(0x98, io); /* volume up + sigstr + on */
81 outb(0xd8, io); /* volume steady + sigstr + on */
84 static void rt_mute(struct rt_device *dev)
88 outb(0xd0, io); /* volume steady, off */
92 static int rt_setvol(struct rt_device *dev, int vol)
98 if(vol == dev->curvol) { /* requested volume = current */
99 if (dev->muted) { /* user is unmuting the card */
101 outb (0xd8, io); /* enable card */
107 if(vol == 0) { /* volume = 0 means mute the card */
108 outb(0x48, io); /* volume down but still "on" */
109 sleep_delay(2000000); /* make sure it's totally down */
110 outb(0xd0, io); /* volume steady, off */
111 dev->curvol = 0; /* track the volume state! */
117 if(vol > dev->curvol)
118 for(i = dev->curvol; i < vol; i++)
121 for(i = dev->curvol; i > vol; i--)
129 /* the 128+64 on these outb's is to keep the volume stable while tuning
130 * without them, the volume _will_ creep up with each frequency change
131 * and bit 4 (+16) is to keep the signal strength meter enabled
134 static void send_0_byte(int port, struct rt_device *dev)
136 if ((dev->curvol == 0) || (dev->muted)) {
137 outb_p(128+64+16+ 1, port); /* wr-enable + data low */
138 outb_p(128+64+16+2+1, port); /* clock */
141 outb_p(128+64+16+8+ 1, port); /* on + wr-enable + data low */
142 outb_p(128+64+16+8+2+1, port); /* clock */
147 static void send_1_byte(int port, struct rt_device *dev)
149 if ((dev->curvol == 0) || (dev->muted)) {
150 outb_p(128+64+16+4 +1, port); /* wr-enable+data high */
151 outb_p(128+64+16+4+2+1, port); /* clock */
154 outb_p(128+64+16+8+4 +1, port); /* on+wr-enable+data high */
155 outb_p(128+64+16+8+4+2+1, port); /* clock */
161 static int rt_setfreq(struct rt_device *dev, unsigned long freq)
165 /* adapted from radio-aztech.c */
167 /* now uses VIDEO_TUNER_LOW for fine tuning */
169 freq += 171200; /* Add 10.7 MHz IF */
170 freq /= 800; /* Convert to 50 kHz units */
172 mutex_lock(&lock); /* Stop other ops interfering */
174 send_0_byte (io, dev); /* 0: LSB of frequency */
176 for (i = 0; i < 13; i++) /* : frequency bits (1-13) */
178 send_1_byte (io, dev);
180 send_0_byte (io, dev);
182 send_0_byte (io, dev); /* 14: test bit - always 0 */
183 send_0_byte (io, dev); /* 15: test bit - always 0 */
185 send_0_byte (io, dev); /* 16: band data 0 - always 0 */
186 send_0_byte (io, dev); /* 17: band data 1 - always 0 */
187 send_0_byte (io, dev); /* 18: band data 2 - always 0 */
188 send_0_byte (io, dev); /* 19: time base - always 0 */
190 send_0_byte (io, dev); /* 20: spacing (0 = 25 kHz) */
191 send_1_byte (io, dev); /* 21: spacing (1 = 25 kHz) */
192 send_0_byte (io, dev); /* 22: spacing (0 = 25 kHz) */
193 send_1_byte (io, dev); /* 23: AM/FM (FM = 1, always) */
195 if ((dev->curvol == 0) || (dev->muted))
196 outb (0xd0, io); /* volume steady + sigstr */
198 outb (0xd8, io); /* volume steady + sigstr + on */
205 static int rt_getsigstr(struct rt_device *dev)
207 if (inb(io) & 2) /* bit set = no signal present */
209 return 1; /* signal present */
212 static int rt_do_ioctl(struct inode *inode, struct file *file,
213 unsigned int cmd, void *arg)
215 struct video_device *dev = video_devdata(file);
216 struct rt_device *rt=dev->priv;
222 struct video_capability *v = arg;
223 memset(v,0,sizeof(*v));
224 v->type=VID_TYPE_TUNER;
227 strcpy(v->name, "RadioTrack");
232 struct video_tuner *v = arg;
233 if(v->tuner) /* Only 1 tuner */
235 v->rangelow=(87*16000);
236 v->rangehigh=(108*16000);
237 v->flags=VIDEO_TUNER_LOW;
238 v->mode=VIDEO_MODE_AUTO;
239 strcpy(v->name, "FM");
240 v->signal=0xFFFF*rt_getsigstr(rt);
245 struct video_tuner *v = arg;
248 /* Only 1 tuner so no setting needed ! */
253 unsigned long *freq = arg;
259 unsigned long *freq = arg;
261 rt_setfreq(rt, rt->curfreq);
266 struct video_audio *v = arg;
267 memset(v,0, sizeof(*v));
268 v->flags|=VIDEO_AUDIO_MUTABLE|VIDEO_AUDIO_VOLUME;
269 v->volume=rt->curvol * 6554;
271 strcpy(v->name, "Radio");
276 struct video_audio *v = arg;
279 if(v->flags&VIDEO_AUDIO_MUTE)
282 rt_setvol(rt,v->volume/6554);
290 static int rt_ioctl(struct inode *inode, struct file *file,
291 unsigned int cmd, unsigned long arg)
293 return video_usercopy(inode, file, cmd, arg, rt_do_ioctl);
296 static struct rt_device rtrack_unit;
298 static struct file_operations rtrack_fops = {
299 .owner = THIS_MODULE,
300 .open = video_exclusive_open,
301 .release = video_exclusive_release,
303 .compat_ioctl = v4l_compat_ioctl32,
307 static struct video_device rtrack_radio=
309 .owner = THIS_MODULE,
310 .name = "RadioTrack radio",
311 .type = VID_TYPE_TUNER,
312 .hardware = VID_HARDWARE_RTRACK,
313 .fops = &rtrack_fops,
316 static int __init rtrack_init(void)
320 printk(KERN_ERR "You must set an I/O address with io=0x???\n");
324 if (!request_region(io, 2, "rtrack"))
326 printk(KERN_ERR "rtrack: port 0x%x already in use\n", io);
330 rtrack_radio.priv=&rtrack_unit;
332 if(video_register_device(&rtrack_radio, VFL_TYPE_RADIO, radio_nr)==-1)
334 release_region(io, 2);
337 printk(KERN_INFO "AIMSlab RadioTrack/RadioReveal card driver.\n");
339 /* Set up the I/O locking */
343 /* mute card - prevents noisy bootups */
345 /* this ensures that the volume is all the way down */
346 outb(0x48, io); /* volume down but still "on" */
347 sleep_delay(2000000); /* make sure it's totally down */
348 outb(0xc0, io); /* steady volume, mute card */
349 rtrack_unit.curvol = 0;
354 MODULE_AUTHOR("M.Kirkwood");
355 MODULE_DESCRIPTION("A driver for the RadioTrack/RadioReveal radio card.");
356 MODULE_LICENSE("GPL");
358 module_param(io, int, 0);
359 MODULE_PARM_DESC(io, "I/O address of the RadioTrack card (0x20f or 0x30f)");
360 module_param(radio_nr, int, 0);
362 static void __exit cleanup_rtrack_module(void)
364 video_unregister_device(&rtrack_radio);
365 release_region(io,2);
368 module_init(rtrack_init);
369 module_exit(cleanup_rtrack_module);