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