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path: root/drivers/media/radio/radio-gemtek.c
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Diffstat (limited to 'drivers/media/radio/radio-gemtek.c')
-rw-r--r--drivers/media/radio/radio-gemtek.c304
1 files changed, 304 insertions, 0 deletions
diff --git a/drivers/media/radio/radio-gemtek.c b/drivers/media/radio/radio-gemtek.c
new file mode 100644
index 000000000000..202bfe6819b8
--- /dev/null
+++ b/drivers/media/radio/radio-gemtek.c
@@ -0,0 +1,304 @@
+/* GemTek radio card driver for Linux (C) 1998 Jonas Munsin <jmunsin@iki.fi>
+ *
+ * GemTek hasn't released any specs on the card, so the protocol had to
+ * be reverse engineered with dosemu.
+ *
+ * Besides the protocol changes, this is mostly a copy of:
+ *
+ * RadioTrack II driver for Linux radio support (C) 1998 Ben Pfaff
+ *
+ * Based on RadioTrack I/RadioReveal (C) 1997 M. Kirkwood
+ * Converted to new API by Alan Cox <Alan.Cox@linux.org>
+ * Various bugfixes and enhancements by Russell Kroll <rkroll@exploits.org>
+ *
+ * TODO: Allow for more than one of these foolish entities :-)
+ *
+ */
+
+#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_GEMTEK_PORT */
+#include <linux/spinlock.h>
+
+#ifndef CONFIG_RADIO_GEMTEK_PORT
+#define CONFIG_RADIO_GEMTEK_PORT -1
+#endif
+
+static int io = CONFIG_RADIO_GEMTEK_PORT;
+static int radio_nr = -1;
+static spinlock_t lock;
+
+struct gemtek_device
+{
+ int port;
+ unsigned long curfreq;
+ int muted;
+};
+
+
+/* local things */
+
+/* the correct way to mute the gemtek may be to write the last written
+ * frequency || 0x10, but just writing 0x10 once seems to do it as well
+ */
+static void gemtek_mute(struct gemtek_device *dev)
+{
+ if(dev->muted)
+ return;
+ spin_lock(&lock);
+ outb(0x10, io);
+ spin_unlock(&lock);
+ dev->muted = 1;
+}
+
+static void gemtek_unmute(struct gemtek_device *dev)
+{
+ if(dev->muted == 0)
+ return;
+ spin_lock(&lock);
+ outb(0x20, io);
+ spin_unlock(&lock);
+ dev->muted = 0;
+}
+
+static void zero(void)
+{
+ outb_p(0x04, io);
+ udelay(5);
+ outb_p(0x05, io);
+ udelay(5);
+}
+
+static void one(void)
+{
+ outb_p(0x06, io);
+ udelay(5);
+ outb_p(0x07, io);
+ udelay(5);
+}
+
+static int gemtek_setfreq(struct gemtek_device *dev, unsigned long freq)
+{
+ int i;
+
+/* freq = 78.25*((float)freq/16000.0 + 10.52); */
+
+ freq /= 16;
+ freq += 10520;
+ freq *= 7825;
+ freq /= 100000;
+
+ spin_lock(&lock);
+
+ /* 2 start bits */
+ outb_p(0x03, io);
+ udelay(5);
+ outb_p(0x07, io);
+ udelay(5);
+
+ /* 28 frequency bits (lsb first) */
+ for (i = 0; i < 14; i++)
+ if (freq & (1 << i))
+ one();
+ else
+ zero();
+ /* 36 unknown bits */
+ for (i = 0; i < 11; i++)
+ zero();
+ one();
+ for (i = 0; i < 4; i++)
+ zero();
+ one();
+ zero();
+
+ /* 2 end bits */
+ outb_p(0x03, io);
+ udelay(5);
+ outb_p(0x07, io);
+ udelay(5);
+
+ spin_unlock(&lock);
+
+ return 0;
+}
+
+static int gemtek_getsigstr(struct gemtek_device *dev)
+{
+ spin_lock(&lock);
+ inb(io);
+ udelay(5);
+ spin_unlock(&lock);
+ if (inb(io) & 8) /* bit set = no signal present */
+ return 0;
+ return 1; /* signal present */
+}
+
+static int gemtek_do_ioctl(struct inode *inode, struct file *file,
+ unsigned int cmd, void *arg)
+{
+ struct video_device *dev = video_devdata(file);
+ struct gemtek_device *rt=dev->priv;
+
+ switch(cmd)
+ {
+ case VIDIOCGCAP:
+ {
+ struct video_capability *v = arg;
+ memset(v,0,sizeof(*v));
+ v->type=VID_TYPE_TUNER;
+ v->channels=1;
+ v->audios=1;
+ strcpy(v->name, "GemTek");
+ return 0;
+ }
+ case VIDIOCGTUNER:
+ {
+ struct video_tuner *v = arg;
+ if(v->tuner) /* Only 1 tuner */
+ return -EINVAL;
+ v->rangelow=87*16000;
+ v->rangehigh=108*16000;
+ v->flags=VIDEO_TUNER_LOW;
+ v->mode=VIDEO_MODE_AUTO;
+ v->signal=0xFFFF*gemtek_getsigstr(rt);
+ strcpy(v->name, "FM");
+ return 0;
+ }
+ case VIDIOCSTUNER:
+ {
+ struct video_tuner *v = arg;
+ if(v->tuner!=0)
+ return -EINVAL;
+ /* Only 1 tuner so no setting needed ! */
+ return 0;
+ }
+ case VIDIOCGFREQ:
+ {
+ unsigned long *freq = arg;
+ *freq = rt->curfreq;
+ return 0;
+ }
+ case VIDIOCSFREQ:
+ {
+ unsigned long *freq = arg;
+ rt->curfreq = *freq;
+ /* needs to be called twice in order for getsigstr to work */
+ gemtek_setfreq(rt, rt->curfreq);
+ gemtek_setfreq(rt, rt->curfreq);
+ return 0;
+ }
+ case VIDIOCGAUDIO:
+ {
+ struct video_audio *v = arg;
+ memset(v,0, sizeof(*v));
+ v->flags|=VIDEO_AUDIO_MUTABLE;
+ v->volume=1;
+ v->step=65535;
+ strcpy(v->name, "Radio");
+ return 0;
+ }
+ case VIDIOCSAUDIO:
+ {
+ struct video_audio *v = arg;
+ if(v->audio)
+ return -EINVAL;
+
+ if(v->flags&VIDEO_AUDIO_MUTE)
+ gemtek_mute(rt);
+ else
+ gemtek_unmute(rt);
+
+ return 0;
+ }
+ default:
+ return -ENOIOCTLCMD;
+ }
+}
+
+static int gemtek_ioctl(struct inode *inode, struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ return video_usercopy(inode, file, cmd, arg, gemtek_do_ioctl);
+}
+
+static struct gemtek_device gemtek_unit;
+
+static struct file_operations gemtek_fops = {
+ .owner = THIS_MODULE,
+ .open = video_exclusive_open,
+ .release = video_exclusive_release,
+ .ioctl = gemtek_ioctl,
+ .llseek = no_llseek,
+};
+
+static struct video_device gemtek_radio=
+{
+ .owner = THIS_MODULE,
+ .name = "GemTek radio",
+ .type = VID_TYPE_TUNER,
+ .hardware = VID_HARDWARE_GEMTEK,
+ .fops = &gemtek_fops,
+};
+
+static int __init gemtek_init(void)
+{
+ if(io==-1)
+ {
+ printk(KERN_ERR "You must set an I/O address with io=0x20c, io=0x30c, io=0x24c or io=0x34c (io=0x020c or io=0x248 for the combined sound/radiocard)\n");
+ return -EINVAL;
+ }
+
+ if (!request_region(io, 4, "gemtek"))
+ {
+ printk(KERN_ERR "gemtek: port 0x%x already in use\n", io);
+ return -EBUSY;
+ }
+
+ gemtek_radio.priv=&gemtek_unit;
+
+ if(video_register_device(&gemtek_radio, VFL_TYPE_RADIO, radio_nr)==-1)
+ {
+ release_region(io, 4);
+ return -EINVAL;
+ }
+ printk(KERN_INFO "GemTek Radio Card driver.\n");
+
+ spin_lock_init(&lock);
+
+ /* this is _maybe_ unnecessary */
+ outb(0x01, io);
+
+ /* mute card - prevents noisy bootups */
+ gemtek_unit.muted = 0;
+ gemtek_mute(&gemtek_unit);
+
+ return 0;
+}
+
+MODULE_AUTHOR("Jonas Munsin");
+MODULE_DESCRIPTION("A driver for the GemTek Radio Card");
+MODULE_LICENSE("GPL");
+
+module_param(io, int, 0);
+MODULE_PARM_DESC(io, "I/O address of the GemTek card (0x20c, 0x30c, 0x24c or 0x34c (0x20c or 0x248 have been reported to work for the combined sound/radiocard)).");
+module_param(radio_nr, int, 0);
+
+static void __exit gemtek_cleanup(void)
+{
+ video_unregister_device(&gemtek_radio);
+ release_region(io,4);
+}
+
+module_init(gemtek_init);
+module_exit(gemtek_cleanup);
+
+/*
+ Local variables:
+ compile-command: "gcc -c -DMODVERSIONS -D__KERNEL__ -DMODULE -O6 -Wall -Wstrict-prototypes -I /home/blp/tmp/linux-2.1.111-rtrack/include radio-rtrack2.c"
+ End:
+*/