patch-2.4.0-test7 linux/drivers/media/radio/radio-aimslab.c

• Lines: 391
• Date: Mon Jun 19 13:25:06 2000
• Orig file: v2.4.0-test6/linux/drivers/media/radio/radio-aimslab.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.0-test6/linux/drivers/media/radio/radio-aimslab.c linux/drivers/media/radio/radio-aimslab.c
@@ -0,0 +1,390 @@
+/* radiotrack (radioreveal) driver for Linux radio support
+ * (c) 1997 M. Kirkwood
+ * Coverted to new API by Alan Cox <Alan.Cox@linux.org>
+ * Various bugfixes and enhancements by Russell Kroll <rkroll@exploits.org>
+ *
+ * History:
+ * 1999-02-24	Russell Kroll <rkroll@exploits.org>
+ * 		Fine tuning/VIDEO_TUNER_LOW
+ *		Frequency range expanded to start at 87 MHz
+ *
+ * TODO: Allow for more than one of these foolish entities :-)
+ *
+ * Notes on the hardware (reverse engineered from other peoples'
+ * reverse engineering of AIMS' code :-)
+ *
+ *  Frequency control is done digitally -- ie out(port,encodefreq(95.8));
+ *
+ *  The signal strength query is unsurprisingly inaccurate.  And it seems
+ *  to indicate that (on my card, at least) the frequency setting isn't
+ *  too great.  (I have to tune up .025MHz from what the freq should be
+ *  to get a report that the thing is tuned.)
+ *
+ *  Volume control is (ugh) analogue:
+ *   out(port, start_increasing_volume);
+ *   wait(a_wee_while);
+ *   out(port, stop_changing_the_volume);
+ *  
+ */
+
+#include <linux/module.h>	/* Modules 			*/
+#include <linux/init.h>		/* Initdata			*/
+#include <linux/ioport.h>	/* check_region, request_region	*/
+#include <linux/delay.h>	/* udelay			*/
+#include <asm/io.h>		/* outb, outb_p			*/
+#include <asm/uaccess.h>	/* copy to/from user		*/
+#include <linux/videodev.h>	/* kernel radio structs		*/
+#include <linux/config.h>	/* CONFIG_RADIO_RTRACK_PORT 	*/
+#include <asm/semaphore.h>	/* Lock for the I/O 		*/
+
+#ifndef CONFIG_RADIO_RTRACK_PORT
+#define CONFIG_RADIO_RTRACK_PORT -1
+#endif
+
+static int io = CONFIG_RADIO_RTRACK_PORT; 
+static int users = 0;
+static struct semaphore lock;
+
+struct rt_device
+{
+	int port;
+	int curvol;
+	unsigned long curfreq;
+	int muted;
+};
+
+
+/* local things */
+
+static void sleep_delay(long n)
+{
+	/* Sleep nicely for 'n' uS */
+	int d=n/(1000000/HZ);
+	if(!d)
+		udelay(n);
+	else
+	{
+		/* Yield CPU time */
+		unsigned long x=jiffies;
+		while((jiffies-x)<=d)
+			schedule();
+	}
+}
+
+static void rt_decvol(void)
+{
+	outb(0x58, io);		/* volume down + sigstr + on	*/
+	sleep_delay(100000);
+	outb(0xd8, io);		/* volume steady + sigstr + on	*/
+}
+
+static void rt_incvol(void)
+{
+	outb(0x98, io);		/* volume up + sigstr + on	*/
+	sleep_delay(100000);
+	outb(0xd8, io);		/* volume steady + sigstr + on	*/
+}
+
+static void rt_mute(struct rt_device *dev)
+{
+	dev->muted = 1;
+	down(&lock);
+	outb(0xd0, io);			/* volume steady, off		*/
+	up(&lock);
+}
+
+static int rt_setvol(struct rt_device *dev, int vol)
+{
+	int i;
+
+	down(&lock);
+	
+	if(vol == dev->curvol) {	/* requested volume = current */
+		if (dev->muted) {	/* user is unmuting the card  */
+			dev->muted = 0;
+			outb (0xd8, io);	/* enable card */
+		}	
+		up(&lock);
+		return 0;
+	}
+
+	if(vol == 0) {			/* volume = 0 means mute the card */
+		outb(0x48, io);		/* volume down but still "on"	*/
+		sleep_delay(2000000);	/* make sure it's totally down	*/
+		outb(0xd0, io);		/* volume steady, off		*/
+		dev->curvol = 0;	/* track the volume state!	*/
+		up(&lock);
+		return 0;
+	}
+
+	dev->muted = 0;
+	if(vol > dev->curvol)
+		for(i = dev->curvol; i < vol; i++) 
+			rt_incvol();
+	else
+		for(i = dev->curvol; i > vol; i--) 
+			rt_decvol();
+
+	dev->curvol = vol;
+	up(&lock);
+	return 0;
+}
+
+/* the 128+64 on these outb's is to keep the volume stable while tuning 
+ * without them, the volume _will_ creep up with each frequency change
+ * and bit 4 (+16) is to keep the signal strength meter enabled
+ */
+
+void send_0_byte(int port, struct rt_device *dev)
+{
+	if ((dev->curvol == 0) || (dev->muted)) {
+		outb_p(128+64+16+  1, port);   /* wr-enable + data low */
+		outb_p(128+64+16+2+1, port);   /* clock */
+	}
+	else {
+		outb_p(128+64+16+8+  1, port);  /* on + wr-enable + data low */
+		outb_p(128+64+16+8+2+1, port);  /* clock */
+	}
+	sleep_delay(1000); 
+}
+
+void send_1_byte(int port, struct rt_device *dev)
+{
+	if ((dev->curvol == 0) || (dev->muted)) {
+		outb_p(128+64+16+4  +1, port);   /* wr-enable+data high */
+		outb_p(128+64+16+4+2+1, port);   /* clock */
+	} 
+	else {
+		outb_p(128+64+16+8+4  +1, port); /* on+wr-enable+data high */
+		outb_p(128+64+16+8+4+2+1, port); /* clock */
+	}
+
+	sleep_delay(1000); 
+}
+
+static int rt_setfreq(struct rt_device *dev, unsigned long freq)
+{
+	int i;
+
+	/* adapted from radio-aztech.c */
+
+	/* now uses VIDEO_TUNER_LOW for fine tuning */
+
+	freq += 171200;			/* Add 10.7 MHz IF 		*/
+	freq /= 800;			/* Convert to 50 kHz units	*/
+	
+	down(&lock);			/* Stop other ops interfering */
+	 
+	send_0_byte (io, dev);		/*  0: LSB of frequency		*/
+
+	for (i = 0; i < 13; i++)	/*   : frequency bits (1-13)	*/
+		if (freq & (1 << i))
+			send_1_byte (io, dev);
+		else
+			send_0_byte (io, dev);
+
+	send_0_byte (io, dev);		/* 14: test bit - always 0    */
+	send_0_byte (io, dev);		/* 15: test bit - always 0    */
+
+	send_0_byte (io, dev);		/* 16: band data 0 - always 0 */
+	send_0_byte (io, dev);		/* 17: band data 1 - always 0 */
+	send_0_byte (io, dev);		/* 18: band data 2 - always 0 */
+	send_0_byte (io, dev);		/* 19: time base - always 0   */
+
+	send_0_byte (io, dev);		/* 20: spacing (0 = 25 kHz)   */
+	send_1_byte (io, dev);		/* 21: spacing (1 = 25 kHz)   */
+	send_0_byte (io, dev);		/* 22: spacing (0 = 25 kHz)   */
+	send_1_byte (io, dev);		/* 23: AM/FM (FM = 1, always) */
+
+	if ((dev->curvol == 0) || (dev->muted))
+		outb (0xd0, io);	/* volume steady + sigstr */
+	else
+		outb (0xd8, io);	/* volume steady + sigstr + on */
+		
+	up(&lock);
+
+	return 0;
+}
+
+static int rt_getsigstr(struct rt_device *dev)
+{
+	if (inb(io) & 2)	/* bit set = no signal present	*/
+		return 0;
+	return 1;		/* signal present		*/
+}
+
+static int rt_ioctl(struct video_device *dev, unsigned int cmd, void *arg)
+{
+	struct rt_device *rt=dev->priv;
+	
+	switch(cmd)
+	{
+		case VIDIOCGCAP:
+		{
+			struct video_capability v;
+			v.type=VID_TYPE_TUNER;
+			v.channels=1;
+			v.audios=1;
+			/* No we don't do pictures */
+			v.maxwidth=0;
+			v.maxheight=0;
+			v.minwidth=0;
+			v.minheight=0;
+			strcpy(v.name, "RadioTrack");
+			if(copy_to_user(arg,&v,sizeof(v)))
+				return -EFAULT;
+			return 0;
+		}
+		case VIDIOCGTUNER:
+		{
+			struct video_tuner v;
+			if(copy_from_user(&v, arg,sizeof(v))!=0) 
+				return -EFAULT;
+			if(v.tuner)	/* Only 1 tuner */ 
+				return -EINVAL;
+			v.rangelow=(87*16000);
+			v.rangehigh=(108*16000);
+			v.flags=VIDEO_TUNER_LOW;
+			v.mode=VIDEO_MODE_AUTO;
+			strcpy(v.name, "FM");
+			v.signal=0xFFFF*rt_getsigstr(rt);
+			if(copy_to_user(arg,&v, sizeof(v)))
+				return -EFAULT;
+			return 0;
+		}
+		case VIDIOCSTUNER:
+		{
+			struct video_tuner v;
+			if(copy_from_user(&v, arg, sizeof(v)))
+				return -EFAULT;
+			if(v.tuner!=0)
+				return -EINVAL;
+			/* Only 1 tuner so no setting needed ! */
+			return 0;
+		}
+		case VIDIOCGFREQ:
+			if(copy_to_user(arg, &rt->curfreq, sizeof(rt->curfreq)))
+				return -EFAULT;
+			return 0;
+		case VIDIOCSFREQ:
+			if(copy_from_user(&rt->curfreq, arg,sizeof(rt->curfreq)))
+				return -EFAULT;
+			rt_setfreq(rt, rt->curfreq);
+			return 0;
+		case VIDIOCGAUDIO:
+		{	
+			struct video_audio v;
+			memset(&v,0, sizeof(v));
+			v.flags|=VIDEO_AUDIO_MUTABLE|VIDEO_AUDIO_VOLUME;
+			v.volume=rt->curvol * 6554;
+			v.step=6554;
+			strcpy(v.name, "Radio");
+			if(copy_to_user(arg,&v, sizeof(v)))
+				return -EFAULT;
+			return 0;			
+		}
+		case VIDIOCSAUDIO:
+		{
+			struct video_audio v;
+			if(copy_from_user(&v, arg, sizeof(v))) 
+				return -EFAULT;	
+			if(v.audio) 
+				return -EINVAL;
+
+			if(v.flags&VIDEO_AUDIO_MUTE) 
+				rt_mute(rt);
+			else
+				rt_setvol(rt,v.volume/6554);	
+
+			return 0;
+		}
+		default:
+			return -ENOIOCTLCMD;
+	}
+}
+
+static int rt_open(struct video_device *dev, int flags)
+{
+	if(users)
+		return -EBUSY;
+	users++;
+	MOD_INC_USE_COUNT;
+	return 0;
+}
+
+static void rt_close(struct video_device *dev)
+{
+	users--;
+	MOD_DEC_USE_COUNT;
+}
+
+static struct rt_device rtrack_unit;
+
+static struct video_device rtrack_radio=
+{
+	"RadioTrack radio",
+	VID_TYPE_TUNER,
+	VID_HARDWARE_RTRACK,
+	rt_open,
+	rt_close,
+	NULL,	/* Can't read  (no capture ability) */
+	NULL,	/* Can't write */
+	NULL,	/* No poll */
+	rt_ioctl,
+	NULL,
+	NULL
+};
+
+static int __init rtrack_init(void)
+{
+	if(io==-1)
+	{
+		printk(KERN_ERR "You must set an I/O address with io=0x???\n");
+		return -EINVAL;
+	}
+
+	if (check_region(io, 2)) 
+	{
+		printk(KERN_ERR "rtrack: port 0x%x already in use\n", io);
+		return -EBUSY;
+	}
+
+	rtrack_radio.priv=&rtrack_unit;
+	
+	if(video_register_device(&rtrack_radio, VFL_TYPE_RADIO)==-1)
+		return -EINVAL;
+		
+	request_region(io, 2, "rtrack");
+	printk(KERN_INFO "AIMSlab RadioTrack/RadioReveal card driver.\n");
+
+	/* Set up the I/O locking */
+	
+	init_MUTEX(&lock);
+	
+ 	/* mute card - prevents noisy bootups */
+
+	/* this ensures that the volume is all the way down  */
+	outb(0x48, io);		/* volume down but still "on"	*/
+	sleep_delay(2000000);	/* make sure it's totally down	*/
+	outb(0xc0, io);		/* steady volume, mute card	*/
+	rtrack_unit.curvol = 0;
+
+	return 0;
+}
+
+MODULE_AUTHOR("M.Kirkwood");
+MODULE_DESCRIPTION("A driver for the RadioTrack/RadioReveal radio card.");
+MODULE_PARM(io, "i");
+MODULE_PARM_DESC(io, "I/O address of the RadioTrack card (0x20f or 0x30f)");
+
+EXPORT_NO_SYMBOLS;
+
+static void __exit cleanup_rtrack_module(void)
+{
+	video_unregister_device(&rtrack_radio);
+	release_region(io,2);
+}
+
+module_init(rtrack_init);
+module_exit(cleanup_rtrack_module);
+