patch-2.2.0-pre1 linux/drivers/char/radio-gemtek.c

• Lines: 311
• Date: Sun Dec 27 10:49:06 1998
• Orig file: v2.1.132/linux/drivers/char/radio-gemtek.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.132/linux/drivers/char/radio-gemtek.c linux/drivers/char/radio-gemtek.c
@@ -0,0 +1,310 @@
+/* GemTek radio card driver for Linux (C) 1998 Jonas Munsin <jmunsin@iki.fi>
+ *
+ * GemTek hasn't released any specs on the card, so the protocol had to
+ * be reverse engineered with dosemu.
+ *
+ * Besides the protocol changes, this is mostly a copy of:
+ *
+ *    RadioTrack II driver for Linux radio support (C) 1998 Ben Pfaff
+ * 
+ *    Based on RadioTrack I/RadioReveal (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>
+ *
+ * TODO: Allow for more than one of these foolish entities :-)
+ *
+ */
+
+#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_GEMTEK_PORT 	*/
+
+#ifndef CONFIG_RADIO_GEMTEK_PORT
+#define CONFIG_RADIO_GEMTEK_PORT -1
+#endif
+
+static int io = CONFIG_RADIO_GEMTEK_PORT; 
+static int users = 0;
+
+struct gemtek_device
+{
+	int port;
+	unsigned long curfreq;
+	int muted;
+};
+
+
+/* local things */
+
+/* the correct way to mute the gemtek may be to write the last written
+ * frequency || 0x10, but just writing 0x10 once seems to do it as well
+ */
+static void gemtek_mute(struct gemtek_device *dev)
+{
+        if(dev->muted)
+		return;
+	outb(0x10, io);
+	dev->muted = 1;
+}
+
+static void gemtek_unmute(struct gemtek_device *dev)
+{
+	if(dev->muted == 0)
+		return;
+	outb(0x20, io);
+	dev->muted = 0;
+}
+
+static void zero(void)
+{
+	outb_p(0x04, io);
+	udelay(5);
+	outb_p(0x05, io);
+	udelay(5);
+}
+
+static void one(void)
+{
+	outb_p(0x06, io);
+	udelay(5);
+	outb_p(0x07, io);
+	udelay(5);
+}
+
+static int gemtek_setfreq(struct gemtek_device *dev, unsigned long freq)
+{
+	int i;
+
+/*        freq = 78.25*((float)freq/16000.0 + 10.52); */
+
+	freq /= 16;
+	freq += 10520;
+	freq *= 7825;
+	freq /= 100000;
+
+	/* 2 start bits */
+	outb_p(0x03, io);
+	udelay(5);
+	outb_p(0x07, io);
+	udelay(5);
+
+        /* 28 frequency bits (lsb first) */
+	for (i = 0; i < 14; i++)
+		if (freq & (1 << i))
+			one();
+		else
+			zero();
+        /* 36 unknown bits */
+	for (i = 0; i < 11; i++)
+		zero();
+	one();
+	for (i = 0; i < 4; i++)
+		zero();
+	one();
+	zero();
+
+	/* 2 end bits */
+	outb_p(0x03, io);
+	udelay(5);
+	outb_p(0x07, io);
+	udelay(5);
+
+	return 0;
+}
+
+int gemtek_getsigstr(struct gemtek_device *dev)
+{
+	inb(io);
+	udelay(5);
+	if (inb(io) & 8)		/* bit set = no signal present */
+		return 0;
+	return 1;		/* signal present */
+}
+
+static int gemtek_ioctl(struct video_device *dev, unsigned int cmd, void *arg)
+{
+	struct gemtek_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, "GemTek");
+			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;
+			v.signal=0xFFFF*gemtek_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;
+		/* needs to be called twice in order for getsigstr to work */
+			gemtek_setfreq(rt, rt->curfreq);
+			gemtek_setfreq(rt, rt->curfreq);
+			return 0;
+		case VIDIOCGAUDIO:
+		{	
+			struct video_audio v;
+			memset(&v,0, sizeof(v));
+			v.flags|=VIDEO_AUDIO_MUTABLE;
+			v.volume=1;
+			v.step=65535;
+			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) 
+				gemtek_mute(rt);
+			else
+			        gemtek_unmute(rt);
+
+			return 0;
+		}
+		default:
+			return -ENOIOCTLCMD;
+	}
+}
+
+static int gemtek_open(struct video_device *dev, int flags)
+{
+	if(users)
+		return -EBUSY;
+	users++;
+	MOD_INC_USE_COUNT;
+	return 0;
+}
+
+static void gemtek_close(struct video_device *dev)
+{
+	users--;
+	MOD_DEC_USE_COUNT;
+}
+
+static struct gemtek_device gemtek_unit;
+
+static struct video_device gemtek_radio=
+{
+	"GemTek radio",
+	VID_TYPE_TUNER,
+	VID_HARDWARE_GEMTEK,
+	gemtek_open,
+	gemtek_close,
+	NULL,	/* Can't read  (no capture ability) */
+	NULL,	/* Can't write */
+	NULL,	/* Can't poll */
+	gemtek_ioctl,
+	NULL,
+	NULL
+};
+
+__initfunc(int gemtek_init(struct video_init *v))
+{
+	if (check_region(io, 4)) 
+	{
+		printk(KERN_ERR "gemtek: port 0x%x already in use\n", io);
+		return -EBUSY;
+	}
+
+	gemtek_radio.priv=&gemtek_unit;
+	
+	if(video_register_device(&gemtek_radio, VFL_TYPE_RADIO)==-1)
+		return -EINVAL;
+		
+	request_region(io, 4, "gemtek");
+	printk(KERN_INFO "GemTek Radio Card driver.\n");
+
+ 	/* mute card - prevents noisy bootups */
+	outb(0x10, io);
+	udelay(5);
+	gemtek_unit.muted = 1;
+
+	/* this is _maybe_ unnecessary */
+	outb(0x01, io);
+
+	return 0;
+}
+
+#ifdef MODULE
+
+MODULE_AUTHOR("Jonas Munsin");
+MODULE_DESCRIPTION("A driver for the GemTek Radio Card");
+MODULE_PARM(io, "i");
+MODULE_PARM_DESC(io, "I/O address of the GemTek card (0x20c, 0x30c, 0x24c or 0x34c)");
+
+EXPORT_NO_SYMBOLS;
+
+int init_module(void)
+{
+	if(io==-1)
+	{
+		printk(KERN_ERR "You must set an I/O address with io=0x20c, io=0x30c, io=0x24c or io=0x34c\n");
+		return -EINVAL;
+	}
+	return gemtek_init(NULL);
+}
+
+void cleanup_module(void)
+{
+	video_unregister_device(&gemtek_radio);
+	release_region(io,4);
+}
+
+#endif
+
+/*
+  Local variables:
+  compile-command: "gcc -c -DMODVERSIONS -D__KERNEL__ -DMODULE -O6 -Wall -Wstrict-prototypes -I /home/blp/tmp/linux-2.1.111-rtrack/include radio-rtrack2.c"
+  End:
+*/