patch-2.1.118 linux/drivers/char/radio-miropcm20.c

• Lines: 246
• Date: Mon Aug 24 09:19:19 1998
• Orig file: v2.1.117/linux/drivers/char/radio-miropcm20.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.117/linux/drivers/char/radio-miropcm20.c linux/drivers/char/radio-miropcm20.c
@@ -0,0 +1,245 @@
+/* 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/lowlevel/aci.c)
+ * Look there for further info...
+ */
+
+#include <linux/module.h>		/* Modules 			*/
+#include <linux/init.h>			/* Initdata			*/
+#include <asm/uaccess.h>		/* copy to/from user		*/
+#include <linux/videodev.h>		/* kernel radio structs		*/
+#include <linux/config.h>		/* CONFIG_RADIO_MIROPCM20 	*/
+#include "../sound/lowlevel/miroaci.h"	/* ACI Control by acimixer	*/
+
+static int users = 0;
+
+struct pcm20_device
+{
+	int port;
+	int curvol;
+	unsigned long curfreq;
+	int muted;
+};
+
+
+/* local things */
+
+
+static void pcm20_mute(struct pcm20_device *dev)
+{
+
+	dev->muted = 1;
+	aci_write_cmd(0xa3,0x01);			
+
+}
+
+static int pcm20_setvol(struct pcm20_device *dev, int vol)
+{
+
+	if(vol == dev->curvol) {	/* requested volume = current */
+		if (dev->muted) {	/* user is unmuting the card  */
+			dev->muted = 0;
+			aci_write_cmd(0xa3,0x00); 	/* enable card */
+		}	
+	
+		return 0;
+	}
+
+	if(vol == 0) {			/* volume = 0 means mute the card */
+		aci_write_cmd(0x3d, 0x20);
+		aci_write_cmd(0x35, 0x20);
+		return 0;
+	}
+
+	dev->muted = 0;
+	aci_write_cmd(0x3d, 32-vol); 	/* Right Channel */
+	aci_write_cmd(0x35, 32-vol);	/* Left Channel */
+	dev->curvol = vol;
+
+	return 0;
+}
+
+static int pcm20_setfreq(struct pcm20_device *dev, unsigned long freq)
+{
+	unsigned char freql;
+	unsigned char freqh;
+
+	freq = (freq * 10) / 16;
+	freql = freq & 0xff;
+	freqh = freq >> 8;	
+
+
+	aci_write_cmd_d(0xa7, freql, freqh);	/*  Tune to frequency	*/
+
+	return 0;
+}
+
+int pcm20_getsigstr(struct pcm20_device *dev)
+{
+	unsigned char buf;
+	aci_indexed_cmd(0xf0, 0x32, &buf);
+	if ((buf & 0x80) == 0x80)	
+		return 0;
+	return 1;		/* signal present		*/
+}
+
+static int pcm20_ioctl(struct video_device *dev, unsigned int cmd, void *arg)
+{
+	struct pcm20_device *pcm20=dev->priv;
+	
+	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=(int)(87.5*16);
+			v.rangehigh=(int)(108.0*16);
+			v.flags=0;
+			v.mode=VIDEO_MODE_AUTO;
+			v.signal=0xFFFF*pcm20_getsigstr(pcm20);
+			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->curfreq, sizeof(pcm20->curfreq)))
+				return -EFAULT;
+			return 0;
+		case VIDIOCSFREQ:
+			if(copy_from_user(&pcm20->curfreq, arg,sizeof(pcm20->curfreq)))
+				return -EFAULT;
+			pcm20_setfreq(pcm20, pcm20->curfreq);
+			return 0;
+		case VIDIOCGAUDIO:
+		{	
+			struct video_audio v;
+			memset(&v,0, sizeof(v));
+			v.flags|=VIDEO_AUDIO_MUTABLE|VIDEO_AUDIO_VOLUME;
+			v.volume=pcm20->curvol * 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;
+
+			if(v.flags&VIDEO_AUDIO_MUTE) 
+				pcm20_mute(pcm20);
+			else
+				pcm20_setvol(pcm20,v.volume/2048);	
+
+			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;
+
+static struct video_device pcm20_radio=
+{
+	"Miro PCM 20 radio",
+	VID_TYPE_TUNER,
+	VID_HARDWARE_RTRACK,
+	pcm20_open,
+	pcm20_close,
+	NULL,	/* Can't read  (no capture ability) */
+	NULL,	/* Can't write */
+	NULL,	/* Can't poll */
+	pcm20_ioctl,
+	NULL,
+	NULL
+};
+
+__initfunc(int pcm20_init(struct video_init *v))
+{
+
+	pcm20_radio.priv=&pcm20_unit;
+	
+	if(video_register_device(&pcm20_radio, VFL_TYPE_RADIO)==-1)
+		return -EINVAL;
+		
+	printk(KERN_INFO "Miro PCM20 radio card driver.\n");
+
+ 	/* mute card - prevents noisy bootups */
+
+	/* this ensures that the volume is all the way down  */
+
+	pcm20_unit.curvol = 0;
+
+	return 0;
+}
+
+#ifdef MODULE
+
+MODULE_AUTHOR("Ruurd Reitsma");
+MODULE_DESCRIPTION("A driver for the Miro PCM20 radio card.");
+
+EXPORT_NO_SYMBOLS;
+
+int init_module(void)
+{
+
+	return pcm20_init(NULL); 
+}
+
+void cleanup_module(void)
+{
+	video_unregister_device(&pcm20_radio);
+}
+
+#endif