patch-2.4.6 linux/drivers/media/radio/miropcm20-radio.c

• Lines: 287
• Date: Tue Jun 12 10:56:11 2001
• Orig file: v2.4.5/linux/drivers/media/radio/miropcm20-radio.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.5/linux/drivers/media/radio/miropcm20-radio.c linux/drivers/media/radio/miropcm20-radio.c
@@ -0,0 +1,286 @@
+/* Miro PCM20 radio driver for Linux radio support
+ * (c) 1998 Ruurd Reitsma <R.A.Reitsma@wbmt.tudelft.nl>
+ * Thanks to Norberto Pellici for the ACI device interface specification
+ * The API part is based on the radiotrack driver by M. Kirkwood
+ * This driver relies on the aci mixer (drivers/sound/aci.c)
+ * Look there for further info...
+ */
+
+/* Revision history:
+ *
+ *   1998        Ruurd Reitsma <R.A.Reitsma@wbmt.tudelft.nl>
+ *   2000-09-05  Robert Siemer <Robert.Siemer@gmx.de>
+ *        removed unfinished volume control (maybe adding it later again)
+ *        use OSS-mixer; added stereo control
+ */
+
+/* What ever you think about the ACI, version 0x07 is not very well!
+ * I cant get frequency, 'tuner status', 'tuner flags' or mute/mono
+ * conditions...                Robert 
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/videodev.h>
+#include "../../sound/aci.h"
+#include "miropcm20-rds-core.h"
+
+static int users = 0;
+static int radio_nr = -1;
+MODULE_PARM(radio_nr, "i");
+
+struct pcm20_device {
+	unsigned long freq;
+	int muted;
+	int stereo;
+};
+
+
+static int pcm20_mute(struct pcm20_device *dev, unsigned char mute)
+{
+	dev->muted = mute;
+	return aci_write_cmd(ACI_SET_TUNERMUTE, mute);
+}
+
+static int pcm20_stereo(struct pcm20_device *dev, unsigned char stereo)
+{
+	dev->stereo = stereo;
+	return aci_write_cmd(ACI_SET_TUNERMONO, !stereo);
+}
+
+static int pcm20_setfreq(struct pcm20_device *dev, unsigned long freq)
+{
+	unsigned char freql;
+	unsigned char freqh;
+
+	dev->freq=freq;
+
+	freq /= 160;
+	if (!(aci_version==0x07 || aci_version>=0xb0))
+		freq /= 10;  /* I don't know exactly which version
+			      * needs this hack */
+	freql = freq & 0xff;
+	freqh = freq >> 8;
+
+	aci_rds_cmd(RDS_RESET, 0, 0);
+	pcm20_stereo(dev, 1);
+
+	return aci_rw_cmd(ACI_WRITE_TUNE, freql, freqh);
+}
+
+static int pcm20_getflags(struct pcm20_device *dev, __u32 *flags, __u16 *signal)
+{
+	/* okay, check for signal, stereo and rds here... */
+	int i;
+	unsigned char buf;
+
+	if ((i=aci_rw_cmd(ACI_READ_TUNERSTATION, -1, -1))<0)
+		return i;
+#if DEBUG
+	printk("check_sig: 0x%x\n", i);
+#endif
+	if (i & 0x80) {
+		/* no signal from tuner */
+		*flags=0;
+		*signal=0;
+		return 0;
+	} else
+		*signal=0xffff;
+
+	if ((i=aci_rw_cmd(ACI_READ_TUNERSTEREO, -1, -1))<0)
+		return i;
+	if (i & 0x40) {
+		*flags=0;
+	} else {
+		/* stereo */
+		*flags=VIDEO_TUNER_STEREO_ON;
+		/* I cant see stereo, when forced to mono */
+		dev->stereo=1;
+	}
+
+	if ((i=aci_rds_cmd(RDS_STATUS, &buf, 1))<0)
+		return i;
+	if (buf & 1)
+		/* RDS available */
+		*flags|=VIDEO_TUNER_RDS_ON;
+	else
+		return 0;
+
+	if ((i=aci_rds_cmd(RDS_RXVALUE, &buf, 1))<0)
+		return i;
+#if DEBUG
+	printk("rds-signal: %d\n", buf);
+#endif
+	if (buf > 15) {
+		printk("miropcm20-radio: RX strengths unexpected high...\n");
+		buf=15;
+	}
+	/* refine signal */
+	if ((*signal=SCALE(15, 0xffff, buf))==0)
+		*signal = 1;
+
+	return 0;
+}
+
+static int pcm20_ioctl(struct video_device *dev, unsigned int cmd, void *arg)
+{
+	struct pcm20_device *pcm20=dev->priv;
+	int i;
+	
+	switch(cmd)
+	{
+		case VIDIOCGCAP:
+		{
+			struct video_capability v;
+			v.type=VID_TYPE_TUNER;
+			strcpy(v.name, "Miro PCM20");
+			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=87*16000;
+			v.rangehigh=108*16000;
+			pcm20_getflags(pcm20, &v.flags, &v.signal);
+			v.flags|=VIDEO_TUNER_LOW;
+			v.mode=VIDEO_MODE_AUTO;
+			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;
+			/* Only 1 tuner so no setting needed ! */
+			return 0;
+		}
+		case VIDIOCGFREQ:
+			if(copy_to_user(arg, &pcm20->freq, sizeof(pcm20->freq)))
+				return -EFAULT;
+			return 0;
+		case VIDIOCSFREQ:
+			if(copy_from_user(&pcm20->freq, arg, sizeof(pcm20->freq)))
+				return -EFAULT;
+			i=pcm20_setfreq(pcm20, pcm20->freq);
+#if DEBUG
+			printk("First view (setfreq): 0x%x\n", i);
+#endif
+			return i;
+		case VIDIOCGAUDIO:
+		{	
+			struct video_audio v;
+			memset(&v,0, sizeof(v));
+			v.flags=VIDEO_AUDIO_MUTABLE;
+			if (pcm20->muted)
+				v.flags|=VIDEO_AUDIO_MUTE;
+			v.mode=VIDEO_SOUND_STEREO;
+			if (pcm20->stereo)
+				v.mode|=VIDEO_SOUND_MONO;
+			/* v.step=2048; */
+			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;
+
+			pcm20_mute(pcm20, !!(v.flags&VIDEO_AUDIO_MUTE));
+			if(v.flags&VIDEO_SOUND_MONO)
+				pcm20_stereo(pcm20, 0);
+			if(v.flags&VIDEO_SOUND_STEREO)
+				pcm20_stereo(pcm20, 1);
+
+			return 0;
+		}
+		default:
+			return -ENOIOCTLCMD;
+	}
+}
+
+static int pcm20_open(struct video_device *dev, int flags)
+{
+	if(users)
+		return -EBUSY;
+	users++;
+	MOD_INC_USE_COUNT;
+	return 0;
+}
+
+static void pcm20_close(struct video_device *dev)
+{
+	users--;
+	MOD_DEC_USE_COUNT;
+}
+
+static struct pcm20_device pcm20_unit = {
+	freq:   87*16000,
+	muted:  1,
+	stereo: 0
+};
+
+static struct video_device pcm20_radio = {
+	owner:		THIS_MODULE,
+	name:		"Miro PCM 20 radio",
+	type:		VID_TYPE_TUNER,
+	hardware:	VID_HARDWARE_RTRACK,
+	open:		pcm20_open,
+	close:		pcm20_close,
+	ioctl:		pcm20_ioctl,
+	priv:		&pcm20_unit
+};
+
+static int __init pcm20_init(void)
+{
+	if(video_register_device(&pcm20_radio, VFL_TYPE_RADIO, radio_nr)==-1)
+		goto video_register_device;
+		
+	if(attach_aci_rds()<0)
+		goto attach_aci_rds;
+
+	printk(KERN_INFO "Miro PCM20 radio card driver.\n");
+
+	return 0;
+
+ attach_aci_rds:
+	video_unregister_device(&pcm20_radio);
+ video_register_device:
+	return -EINVAL;
+}
+
+MODULE_AUTHOR("Ruurd Reitsma");
+MODULE_DESCRIPTION("A driver for the Miro PCM20 radio card.");
+
+EXPORT_NO_SYMBOLS;
+
+static void __exit pcm20_cleanup(void)
+{
+	unload_aci_rds();
+	video_unregister_device(&pcm20_radio);
+}
+
+module_init(pcm20_init);
+module_exit(pcm20_cleanup);