patch-2.3.10 linux/drivers/char/radio-terratec.c

• Lines: 354
• Date: Mon Jul 5 20:07:02 1999
• Orig file: v2.3.9/linux/drivers/char/radio-terratec.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.9/linux/drivers/char/radio-terratec.c linux/drivers/char/radio-terratec.c
@@ -0,0 +1,353 @@
+/* Terratec ActiveRadio ISA Standalone card driver for Linux radio support
+ * (c) 1999 R. Offermanns (rolf@offermanns.de)
+ * based on the aimslab radio driver from M. Kirkwood
+ * many thanks to Michael Becker and Friedhelm Birth (from TerraTec)
+ * 
+ *
+ * History:
+ * 1999-05-21	First preview release
+ * 
+ *  Notes on the hardware:
+ *  There are two "main" chips on the card:
+ *  - Philips OM5610 (http://www-us.semiconductors.philips.com/acrobat/datasheets/OM5610_2.pdf)
+ *  - Philips SAA6588 (http://www-us.semiconductors.philips.com/acrobat/datasheets/SAA6588_1.pdf)
+ *  (you can get the datasheet at the above links)
+ *
+ *  Frequency control is done digitally -- ie out(port,encodefreq(95.8));
+ *  Volume Control is done digitally
+ *
+ *  there is a I2C controlled RDS decoder (SAA6588)  onboard, which i would like to support someday
+ *  (as soon i have understand how to get started :)
+ *  If you can help me out with that, please contact me!!
+ *
+ *  
+ */
+
+#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_TERRATEC_PORT 	*/
+
+#ifndef CONFIG_RADIO_TERRATEC_PORT
+#define CONFIG_RADIO_TERRATEC_PORT 0x590
+#endif
+
+/**************** this ones are for the terratec *******************/
+#define BASEPORT 	0x590
+#define VOLPORT 	0x591
+#define WRT_DIS 	0x00
+#define CLK_OFF		0x00
+#define IIC_DATA	0x01
+#define IIC_CLK		0x02
+#define DATA		0x04
+#define CLK_ON 		0x08
+#define WRT_EN		0x10
+/*******************************************************************/
+
+static int io = CONFIG_RADIO_TERRATEC_PORT; 
+static int users = 0;
+
+struct tt_device
+{
+	int port;
+	int curvol;
+	unsigned long curfreq;
+	int muted;
+};
+
+
+/* local things */
+
+static void cardWriteVol(int volume)
+{
+	int i;
+	volume = volume+(volume * 32); // change both channels
+	for (i=0;i<8;i++)
+	{
+		if (volume & (0x80>>i))
+			outb(0x80, VOLPORT);
+		else outb(0x00, VOLPORT);
+	}
+}
+
+
+
+static void tt_mute(struct tt_device *dev)
+{
+	dev->muted = 1;
+	cardWriteVol(0);
+}
+
+static int tt_setvol(struct tt_device *dev, int vol)
+{
+	
+//	printk(KERN_ERR "setvol called, vol = %d\n", vol);
+
+	if(vol == dev->curvol) {	/* requested volume = current */
+		if (dev->muted) {	/* user is unmuting the card  */
+			dev->muted = 0;
+			cardWriteVol(vol);	/* enable card */
+		}	
+	
+		return 0;
+	}
+
+	if(vol == 0) {			/* volume = 0 means mute the card */
+		cardWriteVol(0);	/* "turn off card" by setting vol to 0 */
+		dev->curvol = vol;	/* track the volume state!	*/
+		return 0;
+	}
+
+	dev->muted = 0;
+	
+	cardWriteVol(vol);
+	 
+	dev->curvol = vol;
+
+	return 0;
+
+}
+
+
+/* this is the worst part in this driver */
+/* many more or less strange things are going on here, but hey, it works :) */
+
+static int tt_setfreq(struct tt_device *dev, unsigned long freq1)
+{	
+	int freq;
+	int i;
+	int p;
+	int  temp;
+	long rest;
+     
+	unsigned char buffer[25];		/* we have to bit shift 25 registers */
+	freq = freq1/160;			/* convert the freq. to a nice to handel value */
+	for(i=24;i>-1;i--)
+		buffer[i]=0;
+
+	rest = freq*10+10700;		/* i once had understood what is going on here */
+					/* maybe some wise guy (friedhelm?) can comment this stuff */
+	i=13;
+	p=10;
+	temp=102400;
+	while (rest!=0)
+	{
+		if (rest%temp  == rest)
+			buffer[i] = 0;
+		else 
+		{
+			buffer[i] = 1; 
+			rest = rest-temp;
+		}
+		i--;
+		p--;
+		temp = temp/2;
+       }
+
+	for (i=24;i>-1;i--)			/* bit shift the values to the radiocard */
+	{
+		if (buffer[i]==1) 
+		{
+			outb(WRT_EN|DATA, BASEPORT);
+			outb(WRT_EN|DATA|CLK_ON  , BASEPORT);
+			outb(WRT_EN|DATA, BASEPORT);
+		}
+		else
+		{
+			outb(WRT_EN|0x00, BASEPORT);
+			outb(WRT_EN|0x00|CLK_ON  , BASEPORT);
+		}
+	}
+	outb(0x00, BASEPORT);     
+  
+  	return 0;
+}
+
+int tt_getsigstr(struct tt_device *dev)		/* TODO */
+{
+	if (inb(io) & 2)	/* bit set = no signal present	*/
+		return 0;
+	return 1;		/* signal present		*/
+}
+
+
+/* implement the video4linux api */
+
+static int tt_ioctl(struct video_device *dev, unsigned int cmd, void *arg)
+{
+	struct tt_device *tt=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, "ActiveRadio");
+			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*tt_getsigstr(tt);
+			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, &tt->curfreq, sizeof(tt->curfreq)))
+				return -EFAULT;
+			return 0;
+		case VIDIOCSFREQ:
+			if(copy_from_user(&tt->curfreq, arg,sizeof(tt->curfreq)))
+				return -EFAULT;
+			tt_setfreq(tt, tt->curfreq);
+			return 0;
+		case VIDIOCGAUDIO:
+		{	
+			struct video_audio v;
+			memset(&v,0, sizeof(v));
+			v.flags|=VIDEO_AUDIO_MUTABLE|VIDEO_AUDIO_VOLUME;
+			v.volume=tt->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) 
+				tt_mute(tt);
+			else
+				tt_setvol(tt,v.volume/6554);	
+
+			return 0;
+		}
+		default:
+			return -ENOIOCTLCMD;
+	}
+}
+
+static int tt_open(struct video_device *dev, int flags)
+{
+	if(users)
+		return -EBUSY;
+	users++;
+	MOD_INC_USE_COUNT;
+	return 0;
+}
+
+static void tt_close(struct video_device *dev)
+{
+	users--;
+	MOD_DEC_USE_COUNT;
+}
+
+static struct tt_device terratec_unit;
+
+static struct video_device terratec_radio=
+{
+	"TerraTec ActiveRadio",
+	VID_TYPE_TUNER,
+	VID_HARDWARE_TERRATEC,
+	tt_open,
+	tt_close,
+	NULL,	/* Can't read  (no capture ability) */
+	NULL,	/* Can't write */
+	NULL,	/* No poll */
+	tt_ioctl,
+	NULL,
+	NULL
+};
+
+__initfunc(int terratec_init(struct video_init *v))
+{
+	if (check_region(io, 2)) 
+	{
+		printk(KERN_ERR "TerraTec: port 0x%x already in use\n", io);
+		return -EBUSY;
+	}
+
+	terratec_radio.priv=&terratec_unit;
+	
+	if(video_register_device(&terratec_radio, VFL_TYPE_RADIO)==-1)
+		return -EINVAL;
+		
+	request_region(io, 2, "terratec");
+	printk(KERN_INFO "TERRATEC ActivRadio Standalone card driver.\n");
+
+ 	/* mute card - prevents noisy bootups */
+
+	/* this ensures that the volume is all the way down  */
+	cardWriteVol(0);
+	terratec_unit.curvol = 0;
+
+	return 0;
+}
+
+#ifdef MODULE
+
+MODULE_AUTHOR("R.OFFERMANNS & others");
+MODULE_DESCRIPTION("A driver for the TerraTec ActiveRadio Standalone radio card.");
+MODULE_PARM(io, "i");
+MODULE_PARM_DESC(io, "I/O address of the TerraTec ActiveRadio card (0x590 or 0x591)");
+
+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 terratec_init(NULL);
+}
+
+void cleanup_module(void)
+{
+	video_unregister_device(&terratec_radio);
+	release_region(io,2);
+	printk(KERN_INFO "TERRATEC ActivRadio Standalone card driver unloaded.\n");	
+}
+
+#endif