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

• Lines: 413
• Date: Thu Oct 28 16:13:13 1999
• Orig file: v2.4.0-test6/linux/drivers/media/radio/radio-zoltrix.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.0-test6/linux/drivers/media/radio/radio-zoltrix.c linux/drivers/media/radio/radio-zoltrix.c
@@ -0,0 +1,412 @@
+/* zoltrix radio plus driver for Linux radio support
+ * (c) 1998 C. van Schaik <carl@leg.uct.ac.za>
+ *
+ * BUGS  
+ *  Due to the inconsistancy in reading from the signal flags
+ *  it is difficult to get an accurate tuned signal.
+ *
+ *  It seems that the card is not linear to 0 volume. It cuts off
+ *  at a low volume, and it is not possible (at least I have not found)
+ *  to get fine volume control over the low volume range.
+ *
+ *  Some code derived from code by Romolo Manfredini
+ *				   romolo@bicnet.it
+ *
+ * 1999-05-06 - (C. van Schaik)
+ *	      - Make signal strength and stereo scans
+ *	        kinder to cpu while in delay
+ * 1999-01-05 - (C. van Schaik)
+ *	      - Changed tuning to 1/160Mhz accuracy
+ *	      - Added stereo support
+ *		(card defaults to stereo)
+ *		(can explicitly force mono on the card)
+ *		(can detect if station is in stereo)
+ *	      - Added unmute function
+ *	      - Reworked ioctl functions
+ */
+
+#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_ZOLTRIX_PORT      */
+
+#ifndef CONFIG_RADIO_ZOLTRIX_PORT
+#define CONFIG_RADIO_ZOLTRIX_PORT -1
+#endif
+
+static int io = CONFIG_RADIO_ZOLTRIX_PORT;
+static int users = 0;
+
+struct zol_device {
+	int port;
+	int curvol;
+	unsigned long curfreq;
+	int muted;
+	unsigned int stereo;
+	struct semaphore lock;
+};
+
+
+/* local things */
+
+static void sleep_delay(void)
+{
+	/* Sleep nicely for +/- 10 mS */
+	schedule();
+}
+
+static int zol_setvol(struct zol_device *dev, int vol)
+{
+	dev->curvol = vol;
+	if (dev->muted)
+		return 0;
+
+	down(&dev->lock);
+	if (vol == 0) {
+		outb(0, io);
+		outb(0, io);
+		inb(io + 3);    /* Zoltrix needs to be read to confirm */
+		up(&dev->lock);
+		return 0;
+	}
+
+	outb(dev->curvol-1, io);
+	sleep_delay();
+	inb(io + 2);
+	up(&dev->lock);
+	return 0;
+}
+
+static void zol_mute(struct zol_device *dev)
+{
+	dev->muted = 1;
+	down(&dev->lock);
+	outb(0, io);
+	outb(0, io);
+	inb(io + 3);            /* Zoltrix needs to be read to confirm */
+	up(&dev->lock);
+}
+
+static void zol_unmute(struct zol_device *dev)
+{
+	dev->muted = 0;
+	zol_setvol(dev, dev->curvol);
+}
+
+static int zol_setfreq(struct zol_device *dev, unsigned long freq)
+{
+	/* tunes the radio to the desired frequency */
+	unsigned long long bitmask, f, m;
+	unsigned int stereo = dev->stereo;
+	int i;
+
+	if (freq == 0)
+		return 1;
+	m = (freq / 160 - 8800) * 2;
+	f = (unsigned long long) m + 0x4d1c;
+
+	bitmask = 0xc480402c10080000ull;
+	i = 45;
+
+	down(&dev->lock);
+	
+	outb(0, io);
+	outb(0, io);
+	inb(io + 3);            /* Zoltrix needs to be read to confirm */
+
+	outb(0x40, io);
+	outb(0xc0, io);
+
+	bitmask = (bitmask ^ ((f & 0xff) << 47) ^ ((f & 0xff00) << 30) ^ ( stereo << 31));
+	while (i--) {
+		if ((bitmask & 0x8000000000000000ull) != 0) {
+			outb(0x80, io);
+			udelay(50);
+			outb(0x00, io);
+			udelay(50);
+			outb(0x80, io);
+			udelay(50);
+		} else {
+			outb(0xc0, io);
+			udelay(50);
+			outb(0x40, io);
+			udelay(50);
+			outb(0xc0, io);
+			udelay(50);
+		}
+		bitmask *= 2;
+	}
+	/* termination sequence */
+	outb(0x80, io);
+	outb(0xc0, io);
+	outb(0x40, io);
+	udelay(1000);
+	inb(io+2);
+
+        udelay(1000);
+        
+	if (dev->muted)
+	{
+		outb(0, io);
+		outb(0, io);
+		inb(io + 3);
+		udelay(1000);
+	}
+	
+	up(&dev->lock);
+	
+	if(!dev->muted)
+	{
+	        zol_setvol(dev, dev->curvol);
+	}
+	return 0;
+}
+
+/* Get signal strength */
+
+int zol_getsigstr(struct zol_device *dev)
+{
+	int a, b;
+
+	down(&dev->lock);
+	outb(0x00, io);         /* This stuff I found to do nothing */
+	outb(dev->curvol, io);
+	sleep_delay();
+	sleep_delay();
+
+	a = inb(io);
+	sleep_delay();
+	b = inb(io);
+
+	up(&dev->lock);
+	
+	if (a != b)
+		return (0);
+
+        if ((a == 0xcf) || (a == 0xdf)  /* I found this out by playing */
+		|| (a == 0xef))       /* with a binary scanner on the card io */
+		return (1);
+ 	return (0);
+}
+
+int zol_is_stereo (struct zol_device *dev)
+{
+	int x1, x2;
+
+	down(&dev->lock);
+	
+	outb(0x00, io);
+	outb(dev->curvol, io);
+	sleep_delay();
+	sleep_delay();
+
+	x1 = inb(io);
+	sleep_delay();
+	x2 = inb(io);
+
+	up(&dev->lock);
+	
+	if ((x1 == x2) && (x1 == 0xcf))
+		return 1;
+	return 0;
+}
+
+static int zol_ioctl(struct video_device *dev, unsigned int cmd, void *arg)
+{
+	struct zol_device *zol = dev->priv;
+
+	switch (cmd) {
+	case VIDIOCGCAP:
+		{
+			struct video_capability v;
+			v.type = VID_TYPE_TUNER;
+			v.channels = 1 + zol->stereo;
+			v.audios = 1;
+			/* No we don't do pictures */
+			v.maxwidth = 0;
+			v.maxheight = 0;
+			v.minwidth = 0;
+			v.minheight = 0;
+			strcpy(v.name, "Zoltrix Radio");
+			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)))
+				return -EFAULT;
+			if (v.tuner)	
+				return -EINVAL;
+			strcpy(v.name, "FM");
+			v.rangelow = (int) (88.0 * 16000);
+			v.rangehigh = (int) (108.0 * 16000);
+			v.flags = zol_is_stereo(zol)
+					? VIDEO_TUNER_STEREO_ON : 0;
+			v.flags |= VIDEO_TUNER_LOW;
+			v.mode = VIDEO_MODE_AUTO;
+			v.signal = 0xFFFF * zol_getsigstr(zol);
+			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, &zol->curfreq, sizeof(zol->curfreq)))
+			return -EFAULT;
+		return 0;
+	case VIDIOCSFREQ:
+		if (copy_from_user(&zol->curfreq, arg, sizeof(zol->curfreq)))
+			return -EFAULT;
+		zol_setfreq(zol, zol->curfreq);
+		return 0;
+	case VIDIOCGAUDIO:
+		{
+			struct video_audio v;
+			memset(&v, 0, sizeof(v));
+			v.flags |= VIDEO_AUDIO_MUTABLE | VIDEO_AUDIO_VOLUME;
+			v.mode != zol_is_stereo(zol)
+				? VIDEO_SOUND_STEREO : VIDEO_SOUND_MONO;
+			v.volume = zol->curvol * 4096;
+			v.step = 4096;
+			strcpy(v.name, "Zoltrix 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)
+				zol_mute(zol);
+			else
+			{
+				zol_unmute(zol);
+				zol_setvol(zol, v.volume / 4096);
+			}
+
+			if (v.mode & VIDEO_SOUND_STEREO)
+			{
+				zol->stereo = 1;
+				zol_setfreq(zol, zol->curfreq);
+			}
+			if (v.mode & VIDEO_SOUND_MONO)
+			{
+				zol->stereo = 0;
+				zol_setfreq(zol, zol->curfreq);
+			}
+
+			return 0;
+		}
+	default:
+		return -ENOIOCTLCMD;
+	}
+}
+
+static int zol_open(struct video_device *dev, int flags)
+{
+	if (users)
+		return -EBUSY;
+	users++;
+	MOD_INC_USE_COUNT;
+	return 0;
+}
+
+static void zol_close(struct video_device *dev)
+{
+	users--;
+	MOD_DEC_USE_COUNT;
+}
+
+static struct zol_device zoltrix_unit;
+
+static struct video_device zoltrix_radio =
+{
+	"Zoltrix Radio Plus",
+	VID_TYPE_TUNER,
+	VID_HARDWARE_ZOLTRIX,
+	zol_open,
+	zol_close,
+	NULL,			/* Can't read  (no capture ability) */
+	NULL,			/* Can't write */
+	NULL,
+	zol_ioctl,
+	NULL,
+	NULL
+};
+
+static int __init zoltrix_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 "zoltrix: port 0x%x already in use\n", io);
+		return -EBUSY;
+	}
+	if ((io != 0x20c) && (io != 0x30c)) {
+		printk(KERN_ERR "zoltrix: invalid port, try 0x20c or 0x30c\n");
+		return -ENXIO;
+	}
+	zoltrix_radio.priv = &zoltrix_unit;
+
+	if (video_register_device(&zoltrix_radio, VFL_TYPE_RADIO) == -1)
+		return -EINVAL;
+
+	request_region(io, 2, "zoltrix");
+	printk(KERN_INFO "Zoltrix Radio Plus card driver.\n");
+
+	init_MUTEX(&zoltrix_unit.lock);
+	
+	/* mute card - prevents noisy bootups */
+
+	/* this ensures that the volume is all the way down  */
+
+	outb(0, io);
+	outb(0, io);
+	sleep_delay();
+	sleep_delay();
+	inb(io + 3);
+
+	zoltrix_unit.curvol = 0;
+	zoltrix_unit.stereo = 1;
+
+	return 0;
+}
+
+MODULE_AUTHOR("C.van Schaik");
+MODULE_DESCRIPTION("A driver for the Zoltrix Radio Plus.");
+MODULE_PARM(io, "i");
+MODULE_PARM_DESC(io, "I/O address of the Zoltrix Radio Plus (0x20c or 0x30c)");
+
+EXPORT_NO_SYMBOLS;
+
+static void __exit zoltrix_cleanup_module(void)
+{
+	video_unregister_device(&zoltrix_radio);
+	release_region(io, 2);
+}
+
+module_init(zoltrix_init);
+module_exit(zoltrix_cleanup_module);
+