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-rw-r--r--drivers/char/radio-typhoon.c433
1 files changed, 433 insertions, 0 deletions
diff --git a/drivers/char/radio-typhoon.c b/drivers/char/radio-typhoon.c
new file mode 100644
index 000000000..698f113e8
--- /dev/null
+++ b/drivers/char/radio-typhoon.c
@@ -0,0 +1,433 @@
+/* Typhoon Radio Card driver for radio support
+ * (c) 1999 Dr. Henrik Seidel <Henrik.Seidel@gmx.de>
+ *
+ * Card manufacturer:
+ * http://194.18.155.92/idc/prod2.idc?nr=50753&lang=e
+ *
+ * Notes on the hardware
+ *
+ * This card has two output sockets, one for speakers and one for line.
+ * The speaker output has volume control, but only in four discrete
+ * steps. The line output has neither volume control nor mute.
+ *
+ * The card has auto-stereo according to its manual, although it all
+ * sounds mono to me (even with the Win/DOS drivers). Maybe it's my
+ * antenna - I really don't know for sure.
+ *
+ * Frequency control is done digitally.
+ *
+ * Volume control is done digitally, but there are only four different
+ * possible values. So you should better always turn the volume up and
+ * use line control. I got the best results by connecting line output
+ * to the sound card microphone input. For such a configuration the
+ * volume control has no effect, since volume control only influences
+ * the speaker output.
+ *
+ * There is no explicit mute/unmute. So I set the radio frequency to a
+ * value where I do expect just noise and turn the speaker volume down.
+ * The frequency change is necessary since the card never seems to be
+ * completely silent.
+ */
+
+#include <linux/module.h> /* Modules */
+#include <linux/init.h> /* Initdata */
+#include <linux/ioport.h> /* check_region, request_region */
+#include <linux/proc_fs.h> /* radio card status report */
+#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_TYPHOON_* */
+
+#define BANNER "Typhoon Radio Card driver v0.1\n"
+
+#ifndef CONFIG_RADIO_TYPHOON_PORT
+#define CONFIG_RADIO_TYPHOON_PORT -1
+#endif
+
+#ifndef CONFIG_RADIO_TYPHOON_MUTEFREQ
+#define CONFIG_RADIO_TYPHOON_MUTEFREQ 0
+#endif
+
+#ifndef CONFIG_PROC_FS
+#undef CONFIG_RADIO_TYPHOON_PROC_FS
+#endif
+
+struct typhoon_device {
+ int users;
+ int iobase;
+ int curvol;
+ int muted;
+ unsigned long curfreq;
+ unsigned long mutefreq;
+};
+
+static void typhoon_setvol_generic(struct typhoon_device *dev, int vol);
+static int typhoon_setfreq_generic(struct typhoon_device *dev,
+ unsigned long frequency);
+static int typhoon_setfreq(struct typhoon_device *dev, unsigned long frequency);
+static void typhoon_mute(struct typhoon_device *dev);
+static void typhoon_unmute(struct typhoon_device *dev);
+static int typhoon_setvol(struct typhoon_device *dev, int vol);
+static int typhoon_ioctl(struct video_device *dev, unsigned int cmd, void *arg);
+static int typhoon_open(struct video_device *dev, int flags);
+static void typhoon_close(struct video_device *dev);
+#ifdef CONFIG_RADIO_TYPHOON_PROC_FS
+static int typhoon_read_proc(char *buf, char **start, off_t offset, int len,
+ int unused);
+#endif
+#ifdef MODULE
+int init_module(void);
+void cleanup_module(void);
+int typhoon_init(struct video_init *v);
+#else
+int typhoon_init(struct video_init *v) __init;
+#endif
+
+static void typhoon_setvol_generic(struct typhoon_device *dev, int vol)
+{
+ vol >>= 14; /* Map 16 bit to 2 bit */
+ vol &= 3;
+ outb_p(vol / 2, dev->iobase); /* Set the volume, high bit. */
+ outb_p(vol % 2, dev->iobase + 2); /* Set the volume, low bit. */
+}
+
+static int typhoon_setfreq_generic(struct typhoon_device *dev,
+ unsigned long frequency)
+{
+ unsigned long outval;
+ unsigned long x;
+
+ /*
+ * The frequency transfer curve is not linear. The best fit I could
+ * get is
+ *
+ * outval = -155 + exp((f + 15.55) * 0.057))
+ *
+ * where frequency f is in MHz. Since we don't have exp in the kernel,
+ * I approximate this function by a third order polynomial.
+ *
+ */
+
+ x = frequency / 160;
+ outval = (x * x + 2500) / 5000;
+ outval = (outval * x + 5000) / 10000;
+ outval -= (10 * x * x + 10433) / 20866;
+ outval += 4 * x - 11505;
+
+ outb_p((outval >> 8) & 0x01, dev->iobase + 4);
+ outb_p(outval >> 9, dev->iobase + 6);
+ outb_p(outval & 0xff, dev->iobase + 8);
+
+ return 0;
+}
+
+static int typhoon_setfreq(struct typhoon_device *dev, unsigned long frequency)
+{
+ typhoon_setfreq_generic(dev, frequency);
+ dev->curfreq = frequency;
+ return 0;
+}
+
+static void typhoon_mute(struct typhoon_device *dev)
+{
+ if (dev->muted == 1)
+ return;
+ typhoon_setvol_generic(dev, 0);
+ typhoon_setfreq_generic(dev, dev->mutefreq);
+ dev->muted = 1;
+}
+
+static void typhoon_unmute(struct typhoon_device *dev)
+{
+ if (dev->muted == 0)
+ return;
+ typhoon_setfreq_generic(dev, dev->curfreq);
+ typhoon_setvol_generic(dev, dev->curvol);
+ dev->muted = 0;
+}
+
+static int typhoon_setvol(struct typhoon_device *dev, int vol)
+{
+ if (dev->muted && vol != 0) { /* user is unmuting the card */
+ dev->curvol = vol;
+ typhoon_unmute(dev);
+ return 0;
+ }
+ if (vol == dev->curvol) /* requested volume == current */
+ return 0;
+
+ if (vol == 0) { /* volume == 0 means mute the card */
+ typhoon_mute(dev);
+ dev->curvol = vol;
+ return 0;
+ }
+ typhoon_setvol_generic(dev, vol);
+ dev->curvol = vol;
+ return 0;
+}
+
+
+static int typhoon_ioctl(struct video_device *dev, unsigned int cmd, void *arg)
+{
+ struct typhoon_device *typhoon = dev->priv;
+
+ 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, "Typhoon 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 = 875 * 1600;
+ v.rangehigh = 1080 * 1600;
+ v.flags = VIDEO_TUNER_LOW;
+ v.mode = VIDEO_MODE_AUTO;
+ v.signal = 0xFFFF; /* We can't get the signal strength */
+ 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, &typhoon->curfreq,
+ sizeof(typhoon->curfreq)))
+ return -EFAULT;
+ return 0;
+ case VIDIOCSFREQ:
+ if (copy_from_user(&typhoon->curfreq, arg,
+ sizeof(typhoon->curfreq)))
+ return -EFAULT;
+ typhoon_setfreq(typhoon, typhoon->curfreq);
+ return 0;
+ case VIDIOCGAUDIO:
+ {
+ struct video_audio v;
+ memset(&v, 0, sizeof(v));
+ v.flags |= VIDEO_AUDIO_MUTABLE | VIDEO_AUDIO_VOLUME;
+ v.mode |= VIDEO_SOUND_MONO;
+ v.volume = typhoon->curvol;
+ v.step = 1 << 14;
+ strcpy(v.name, "Typhoon 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)
+ typhoon_mute(typhoon);
+ else
+ typhoon_unmute(typhoon);
+
+ if (v.flags & VIDEO_AUDIO_VOLUME)
+ typhoon_setvol(typhoon, v.volume);
+
+ return 0;
+ }
+ default:
+ return -ENOIOCTLCMD;
+ }
+}
+
+static int typhoon_open(struct video_device *dev, int flags)
+{
+ struct typhoon_device *typhoon = dev->priv;
+ if (typhoon->users)
+ return -EBUSY;
+ typhoon->users++;
+ MOD_INC_USE_COUNT;
+ return 0;
+}
+
+static void typhoon_close(struct video_device *dev)
+{
+ struct typhoon_device *typhoon = dev->priv;
+ typhoon->users--;
+ MOD_DEC_USE_COUNT;
+}
+
+static struct typhoon_device typhoon_unit =
+{
+ 0, /* users */
+ CONFIG_RADIO_TYPHOON_PORT, /* iobase */
+ 0, /* curvol */
+ 0, /* muted */
+ CONFIG_RADIO_TYPHOON_MUTEFREQ, /* curfreq */
+ CONFIG_RADIO_TYPHOON_MUTEFREQ /* mutefreq */
+};
+
+static struct video_device typhoon_radio =
+{
+ "Typhoon Radio",
+ VID_TYPE_TUNER,
+ VID_HARDWARE_TYPHOON,
+ typhoon_open,
+ typhoon_close,
+ NULL, /* Can't read (no capture ability) */
+ NULL, /* Can't write */
+ NULL, /* Can't poll */
+ typhoon_ioctl,
+ NULL,
+ NULL
+};
+
+#ifdef CONFIG_RADIO_TYPHOON_PROC_FS
+
+static int typhoon_read_proc(char *buf, char **start, off_t offset, int len,
+ int unused)
+{
+ #ifdef MODULE
+ #define MODULEPROCSTRING "Driver loaded as a module"
+ #else
+ #define MODULEPROCSTRING "Driver compiled into kernel"
+ #endif
+
+ #define LIMIT (PAGE_SIZE - 80)
+
+ len = 0;
+ len += sprintf(buf + len, BANNER);
+ if (len > LIMIT) return len;
+ len += sprintf(buf + len, "Load type: " MODULEPROCSTRING "\n\n");
+ if (len > LIMIT) return len;
+ len += sprintf(buf + len, "frequency = %lu kHz\n",
+ typhoon_unit.curfreq >> 4);
+ if (len > LIMIT) return len;
+ len += sprintf(buf + len, "volume = %d\n", typhoon_unit.curvol);
+ if (len > LIMIT) return len;
+ len += sprintf(buf + len, "mute = %s\n", typhoon_unit.muted ?
+ "on" : "off");
+ if (len > LIMIT) return len;
+ len += sprintf(buf + len, "iobase = 0x%x\n", typhoon_unit.iobase);
+ if (len > LIMIT) return len;
+ len += sprintf(buf + len, "mute frequency = %lu kHz\n",
+ typhoon_unit.mutefreq >> 4);
+ return len;
+}
+
+static struct proc_dir_entry typhoon_proc_entry = {
+ 0, /* low_ino: inode is dynamic */
+ 13, "radio-typhoon", /* length of name and name */
+ S_IFREG | S_IRUGO, /* mode */
+ 1, 0, 0, /* nlinks, owner, group */
+ 0, /* size -- not used */
+ NULL, /* operations -- use default */
+ &typhoon_read_proc, /* function used to read data */
+ /* nothing more */
+};
+
+#endif /* CONFIG_RADIO_TYPHOON_PROC_FS */
+
+int typhoon_init(struct video_init *v)
+{
+ printk(KERN_INFO BANNER);
+ if (check_region(typhoon_unit.iobase, 8)) {
+ printk(KERN_ERR "radio-typhoon: port 0x%x already in use\n",
+ typhoon_unit.iobase);
+ return -EBUSY;
+ }
+
+ typhoon_radio.priv = &typhoon_unit;
+ if (video_register_device(&typhoon_radio, VFL_TYPE_RADIO) == -1)
+ return -EINVAL;
+
+ request_region(typhoon_unit.iobase, 8, "typhoon");
+ printk(KERN_INFO "radio-typhoon: port 0x%x.\n", typhoon_unit.iobase);
+ printk(KERN_INFO "radio-typhoon: mute frequency is %lu kHz.\n",
+ typhoon_unit.mutefreq);
+ typhoon_unit.mutefreq <<= 4;
+
+ /* mute card - prevents noisy bootups */
+ typhoon_mute(&typhoon_unit);
+
+#ifdef CONFIG_RADIO_TYPHOON_PROC_FS
+
+ if (proc_register(&proc_root, &typhoon_proc_entry))
+ printk(KERN_ERR "radio-typhoon: registering /proc/radio-typhoon failed\n");
+
+#endif
+
+ return 0;
+}
+
+#ifdef MODULE
+
+MODULE_AUTHOR("Dr. Henrik Seidel");
+MODULE_DESCRIPTION("A driver for the Typhoon radio card (a.k.a. EcoRadio).");
+MODULE_PARM(io, "i");
+MODULE_PARM_DESC(io, "I/O address of the Typhoon card (0x316 or 0x336)");
+MODULE_PARM(mutefreq, "i");
+MODULE_PARM_DESC(mutefreq, "Frequency used when muting the card (in kHz)");
+
+EXPORT_NO_SYMBOLS;
+
+static int io = -1;
+static unsigned long mutefreq = 0;
+
+int init_module(void)
+{
+ if (io == -1) {
+ printk(KERN_ERR "radio-typhoon: You must set an I/O address with io=0x316 or io=0x336\n");
+ return -EINVAL;
+ }
+ typhoon_unit.iobase = io;
+
+ if (mutefreq < 87000 || mutefreq > 108500) {
+ printk(KERN_ERR "radio-typhoon: You must set a frequency (in kHz) used when muting the card,\n");
+ printk(KERN_ERR "radio-typhoon: e.g. with \"mutefreq=87500\" (87000 <= mutefreq <= 108500)\n");
+ return -EINVAL;
+ }
+ typhoon_unit.mutefreq = mutefreq;
+
+ return typhoon_init(NULL);
+}
+
+void cleanup_module(void)
+{
+
+#ifdef CONFIG_RADIO_TYPHOON_PROC_FS
+
+ if (proc_unregister(&proc_root, typhoon_proc_entry.low_ino))
+ printk(KERN_ERR "radio-typhoon: unregistering /proc/radio-typhoon failed\n");
+
+#endif
+
+ video_unregister_device(&typhoon_radio);
+ release_region(io, 8);
+}
+
+#endif
+
+
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