patch-2.3.19 linux/drivers/char/radio-trust.c

• Lines: 355
• Date: Wed Sep 29 14:02:59 1999
• Orig file: v2.3.18/linux/drivers/char/radio-trust.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.18/linux/drivers/char/radio-trust.c linux/drivers/char/radio-trust.c
@@ -0,0 +1,354 @@
+/* radio-trust.c - Trust FM Radio card driver for Linux 2.2 
+ * by Eric Lammerts <eric@scintilla.utwente.nl>
+ *
+ * Based on radio-aztech.c. Original notes:
+ *
+ * Adapted to support the Video for Linux API by 
+ * Russell Kroll <rkroll@exploits.org>.  Based on original tuner code by:
+ *
+ * Quay Ly
+ * Donald Song
+ * Jason Lewis      (jlewis@twilight.vtc.vsc.edu) 
+ * Scott McGrath    (smcgrath@twilight.vtc.vsc.edu)
+ * William McGrath  (wmcgrath@twilight.vtc.vsc.edu)
+ *
+ * The basis for this code may be found at http://bigbang.vtc.vsc.edu/fmradio/
+ */
+
+#include <stdarg.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <asm/io.h>
+#include <asm/uaccess.h>
+#include <linux/videodev.h>
+#include <linux/config.h>	/* CONFIG_RADIO_TRUST_PORT 	*/
+
+/* acceptable ports: 0x350 (JP3 shorted), 0x358 (JP3 open) */
+
+#ifndef CONFIG_RADIO_TRUST_PORT
+#define CONFIG_RADIO_TRUST_PORT -1
+#endif
+
+static int io = CONFIG_RADIO_TRUST_PORT; 
+static int ioval = 0xf;
+static int users = 0;
+static __u16 curvol;
+static __u16 curbass;
+static __u16 curtreble;
+static unsigned long curfreq;
+static int curstereo;
+static int curmute;
+
+/* i2c addresses */
+#define TDA7318_ADDR 0x88
+#define TSA6060T_ADDR 0xc4
+
+#define TR_DELAY do { inb(io); inb(io); inb(io); } while(0)
+#define TR_SET_SCL outb(ioval |= 2, io)
+#define TR_CLR_SCL outb(ioval &= 0xfd, io)
+#define TR_SET_SDA outb(ioval |= 1, io)
+#define TR_CLR_SDA outb(ioval &= 0xfe, io)
+
+static void write_i2c(int n, ...)
+{
+	unsigned char val, mask;
+	va_list args;
+
+	va_start(args, n);
+
+	/* start condition */
+	TR_SET_SDA;
+	TR_SET_SCL;
+	TR_DELAY;
+	TR_CLR_SDA;
+	TR_CLR_SCL;
+	TR_DELAY;
+
+	for(; n; n--) {
+		val = va_arg(args, unsigned);
+		for(mask = 0x80; mask; mask >>= 1) {
+			if(val & mask)
+				TR_SET_SDA;
+			else
+				TR_CLR_SDA;
+			TR_SET_SCL;
+			TR_DELAY;
+			TR_CLR_SCL;
+			TR_DELAY;
+		}
+		/* acknowledge bit */
+		TR_SET_SDA;
+		TR_SET_SCL;
+		TR_DELAY;
+		TR_CLR_SCL;
+		TR_DELAY;
+	}
+
+	/* stop condition */
+	TR_CLR_SDA;
+	TR_DELAY;
+	TR_SET_SCL;
+	TR_DELAY;
+	TR_SET_SDA;
+	TR_DELAY;
+
+	va_end(args);
+}
+
+static void tr_setvol(__u16 vol)
+{
+	curvol = vol / 2048;
+	write_i2c(2, TDA7318_ADDR, curvol ^ 0x1f);
+}
+
+static int basstreble2chip[15] = {
+	0, 1, 2, 3, 4, 5, 6, 7, 14, 13, 12, 11, 10, 9, 8
+};
+
+static void tr_setbass(__u16 bass)
+{
+	curbass = bass / 4370;
+	write_i2c(2, TDA7318_ADDR, 0x60 | basstreble2chip[curbass]);
+}
+
+static void tr_settreble(__u16 treble)
+{
+	curtreble = treble / 4370;
+	write_i2c(2, TDA7318_ADDR, 0x70 | basstreble2chip[curtreble]);
+}
+
+static void tr_setstereo(int stereo)
+{
+	curstereo = !!stereo;
+	ioval = (ioval & 0xfb) | (!curstereo << 2);
+	outb(ioval, io);
+}
+
+static void tr_setmute(int mute)
+{
+	curmute = !!mute;
+	ioval = (ioval & 0xf7) | (curmute << 3);
+	outb(ioval, io);
+}
+
+static int tr_getsigstr(void)
+{
+	int i, v;
+	
+	for(i = 0, v = 0; i < 100; i++) v |= inb(io);
+	return (v & 1)? 0 : 0xffff;
+}
+
+static int tr_getstereo(void)
+{
+	/* don't know how to determine it, just return the setting */
+	return curstereo;
+}
+
+static void tr_setfreq(unsigned long f)
+{
+	f /= 160;	/* Convert to 10 kHz units	*/
+	f += 1070;	/* Add 10.7 MHz IF			*/
+
+	write_i2c(5, TSA6060T_ADDR, (f << 1) | 1, f >> 7, 0x60 | ((f >> 15) & 1), 0);
+}
+
+static int tr_ioctl(struct video_device *dev, unsigned int cmd, void *arg)
+{
+	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, "Trust FM 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))!=0) 
+				return -EFAULT;
+
+			if(v.tuner)	/* Only 1 tuner */ 
+				return -EINVAL;
+
+			v.rangelow = 87500 * 16;
+			v.rangehigh = 108000 * 16;
+			v.flags = VIDEO_TUNER_LOW;
+			v.mode = VIDEO_MODE_AUTO;
+
+			v.signal = tr_getsigstr();
+			if(tr_getstereo())
+				v.flags |= VIDEO_TUNER_STEREO_ON;
+
+			strcpy(v.name, "FM");
+
+			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;
+
+			return 0;
+		}
+		case VIDIOCGFREQ:
+			if(copy_to_user(arg, &curfreq, sizeof(curfreq)))
+				return -EFAULT;
+			return 0;
+
+		case VIDIOCSFREQ:
+		{
+			unsigned long f;
+
+			if(copy_from_user(&f, arg, sizeof(curfreq)))
+				return -EFAULT;
+			tr_setfreq(f);
+			return 0;
+		}
+		case VIDIOCGAUDIO:
+		{	
+			struct video_audio v;
+
+			memset(&v,0, sizeof(v));
+			v.flags = VIDEO_AUDIO_MUTABLE | VIDEO_AUDIO_VOLUME |
+			          VIDEO_AUDIO_BASS | VIDEO_AUDIO_TREBLE;
+			v.mode = curstereo? VIDEO_SOUND_STEREO : VIDEO_SOUND_MONO;
+			v.volume = curvol * 2048;
+			v.step = 2048;
+			v.bass = curbass * 4370;
+			v.treble = curtreble * 4370;
+			
+			strcpy(v.name, "Trust FM 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;
+
+			tr_setvol(v.volume);					
+			tr_setbass(v.bass);
+			tr_settreble(v.treble);
+			tr_setstereo(v.mode & VIDEO_SOUND_STEREO);
+			tr_setmute(v.flags & VIDEO_AUDIO_MUTE);
+			return 0;
+		}
+		default:
+			return -ENOIOCTLCMD;
+	}
+}
+
+static int tr_open(struct video_device *dev, int flags)
+{
+	if(users)
+		return -EBUSY;
+	users++;
+	MOD_INC_USE_COUNT;
+	return 0;
+}
+
+static void tr_close(struct video_device *dev)
+{
+	users--;
+	MOD_DEC_USE_COUNT;
+}
+
+static struct video_device trust_radio=
+{
+	"Trust FM Radio",
+	VID_TYPE_TUNER,
+	VID_HARDWARE_TRUST,
+	tr_open,
+	tr_close,
+	NULL,	/* Can't read  (no capture ability) */
+	NULL,	/* Can't write */
+	NULL,	/* No poll */
+	tr_ioctl,
+	NULL,
+	NULL
+};
+
+static int __init trust_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 "trust: port 0x%x already in use\n", io);
+		return -EBUSY;
+	}
+	if(video_register_device(&trust_radio, VFL_TYPE_RADIO)==-1)
+		return -EINVAL;
+		
+	request_region(io, 2, "Trust FM Radio");
+
+	printk(KERN_INFO "Trust FM Radio card driver v1.0.\n");
+
+	write_i2c(2, TDA7318_ADDR, 0x80);	/* speaker att. LF = 0 dB */
+	write_i2c(2, TDA7318_ADDR, 0xa0);	/* speaker att. RF = 0 dB */
+	write_i2c(2, TDA7318_ADDR, 0xc0);	/* speaker att. LR = 0 dB */
+	write_i2c(2, TDA7318_ADDR, 0xe0);	/* speaker att. RR = 0 dB */
+	write_i2c(2, TDA7318_ADDR, 0x40);	/* stereo 1 input, gain = 18.75 dB */
+
+	tr_setvol(0x8000);					
+	tr_setbass(0x8000);
+	tr_settreble(0x8000);
+	tr_setstereo(1);
+
+	/* mute card - prevents noisy bootups */
+	tr_setmute(1);
+
+	return 0;
+}
+
+#ifdef MODULE
+
+MODULE_AUTHOR("Eric Lammerts, Russell Kroll, Quay Lu, Donald Song, Jason Lewis, Scott McGrath, William McGrath");
+MODULE_DESCRIPTION("A driver for the Trust FM Radio card.");
+MODULE_PARM(io, "i");
+MODULE_PARM_DESC(io, "I/O address of the Trust FM Radio card (0x350 or 0x358)");
+
+EXPORT_NO_SYMBOLS;
+
+#endif /* MODULE */
+
+static void __exit cleanup_trust_module(void)
+{
+	video_unregister_device(&trust_radio);
+	release_region(io, 2);
+}
+
+module_init(trust_init);
+module_exit(cleanup_trust_module);