patch-2.1.105 linux/drivers/char/radio-aimslab.c

• Lines: 332
• Date: Sun Jun 7 10:37:41 1998
• Orig file: v2.1.104/linux/drivers/char/radio-aimslab.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.104/linux/drivers/char/radio-aimslab.c linux/drivers/char/radio-aimslab.c
@@ -0,0 +1,331 @@
+/* radiotrack (radioreveal) driver for Linux radio support
+ * (c) 1997 M. Kirkwood
+ * Coverted to new API by Alan Cox <Alan.Cox@linux.org>
+ *
+ * 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 	*/
+
+#ifndef CONFIG_RADIO_RTRACK_PORT
+#define CONFIG_RADIO_RTRACK_PORT -1
+#endif
+
+static int io = CONFIG_RADIO_RTRACK_PORT; 
+static int users = 0;
+
+struct rt_device
+{
+	int port;
+	int curvol;
+	unsigned long curfreq;
+};
+
+
+/* local things */
+
+static void sleep_delay(int 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();
+	}
+}
+	
+/* Clock out data to the chip. This looks suspiciously like i2c as usual */
+
+static void outbits(int bits, int data, int port)
+{
+	while(bits--) 
+	{
+		if(data & 1) 
+		{
+			outw(5, port);
+			outw(5, port);
+			outw(7, port);
+			outw(7, port);
+		}
+		else 
+		{
+			outw(1, port);
+			outw(1, port);
+			outw(3, port);
+			outw(3, port);
+		}
+		data>>=1;
+	}
+}
+
+static void rt_decvol(int port)
+{
+	outb(0x48, port);
+	sleep_delay(100000);
+	outb(0xc8, port);
+}
+
+static void rt_incvol(int port)
+{
+	outb(0x88, port);
+	sleep_delay(100000);
+	outb(0xc8, port);
+}
+
+static void rt_mute(int port)
+{
+	outb(0, port);
+	outb(0xc0, port);
+}
+
+static void rt_unmute(int port)
+{
+	outb(0, port);
+	outb(0xc8, port);
+}
+
+static int rt_setvol(struct rt_device *dev, int vol)
+{
+	int i;
+	if(vol == dev->curvol)
+		return 0;
+
+	if(vol == 0)
+		rt_mute(dev->port);
+
+	if(vol > dev->curvol)
+		for(i = dev->curvol; i < vol; i++)
+			rt_incvol(dev->port);
+	else
+		for(i = dev->curvol; i > vol; i--)
+			rt_decvol(dev->port);
+
+	if(dev->curvol == 0)
+		rt_unmute(dev->port);
+
+	return 0;
+}
+
+static int rt_setfreq(struct rt_device *dev, unsigned long frequency)
+{
+	int myport = dev->port;
+#define	RTRACK_ENCODE(x)	(((((x)*2)/5)-(40*88))+0xf6c)
+	outbits(16, RTRACK_ENCODE(frequency), myport);
+	outbits(8, 0xa0, myport);
+/* XXX - get rid of this once setvol is implemented properly - XXX */
+/* these insist on turning the thing on.  not sure I approve... */
+	udelay(1000);
+	outb(0, myport);
+	outb(0xc8, myport);
+
+	return 0;
+}
+
+int rt_getsigstr(struct rt_device *dev)
+{
+	int res;
+	int myport = dev->port;
+
+	outb(0xf8, myport);
+	sleep_delay(200000);
+	res = (int)inb(myport);
+	sleep_delay(10000);
+	outb(0xe8, myport);
+	if(res == 0xfd)
+		return 1;
+	else
+		return 0;
+}
+
+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;
+			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=(int)(88.0*16);
+			v.rangehigh=(int)(108.0*16);
+			v.flags=0;
+			v.mode=VIDEO_MODE_AUTO;
+			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;
+			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;
+			rt->curvol=v.volume;
+
+			if(v.flags&VIDEO_AUDIO_MUTE) 
+				rt_mute(rt->port);
+			else
+				rt_setvol(rt,rt->curvol/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 */
+	rt_ioctl,
+	NULL,
+	NULL
+};
+
+__initfunc(int rtrack_init(struct video_init *v))
+{
+	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");
+	/* mute card - prevents noisy bootups */
+	rt_mute(io);
+	return 0;
+}
+
+#ifdef MODULE
+
+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;
+
+int init_module(void)
+{
+	if(io==-1)
+	{
+		printk(KERN_ERR "You must set an I/O address with io=0x???\n");
+		return -EINVAL;
+	}
+	return rtrack_init(NULL);
+}
+
+void cleanup_module(void)
+{
+	video_unregister_device(&rtrack_radio);
+	release_region(io,2);
+}
+
+#endif