summaryrefslogtreecommitdiffstats
path: root/drivers/media/radio/radio-typhoon.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/media/radio/radio-typhoon.c')
-rw-r--r--drivers/media/radio/radio-typhoon.c383
1 files changed, 383 insertions, 0 deletions
diff --git a/drivers/media/radio/radio-typhoon.c b/drivers/media/radio/radio-typhoon.c
new file mode 100644
index 00000000000..d7da901ebe9
--- /dev/null
+++ b/drivers/media/radio/radio-typhoon.c
@@ -0,0 +1,383 @@
+/* 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;
+ struct semaphore lock;
+};
+
+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 inode *inode, struct file *file,
+ unsigned int cmd, unsigned long arg);
+#ifdef CONFIG_RADIO_TYPHOON_PROC_FS
+static int typhoon_get_info(char *buf, char **start, off_t offset, int len);
+#endif
+
+static void typhoon_setvol_generic(struct typhoon_device *dev, int vol)
+{
+ down(&dev->lock);
+ 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. */
+ up(&dev->lock);
+}
+
+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.
+ *
+ */
+
+ down(&dev->lock);
+ 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);
+ up(&dev->lock);
+
+ 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_do_ioctl(struct inode *inode, struct file *file,
+ unsigned int cmd, void *arg)
+{
+ struct video_device *dev = video_devdata(file);
+ struct typhoon_device *typhoon = 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, "Typhoon Radio");
+ return 0;
+ }
+ case VIDIOCGTUNER:
+ {
+ struct video_tuner *v = arg;
+ 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");
+ 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 = typhoon->curfreq;
+ return 0;
+ }
+ case VIDIOCSFREQ:
+ {
+ unsigned long *freq = arg;
+ typhoon->curfreq = *freq;
+ typhoon_setfreq(typhoon, typhoon->curfreq);
+ return 0;
+ }
+ case VIDIOCGAUDIO:
+ {
+ struct video_audio *v = arg;
+ 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");
+ return 0;
+ }
+ case VIDIOCSAUDIO:
+ {
+ struct video_audio *v = arg;
+ 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_ioctl(struct inode *inode, struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ return video_usercopy(inode, file, cmd, arg, typhoon_do_ioctl);
+}
+
+static struct typhoon_device typhoon_unit =
+{
+ .iobase = CONFIG_RADIO_TYPHOON_PORT,
+ .curfreq = CONFIG_RADIO_TYPHOON_MUTEFREQ,
+ .mutefreq = CONFIG_RADIO_TYPHOON_MUTEFREQ,
+};
+
+static struct file_operations typhoon_fops = {
+ .owner = THIS_MODULE,
+ .open = video_exclusive_open,
+ .release = video_exclusive_release,
+ .ioctl = typhoon_ioctl,
+ .llseek = no_llseek,
+};
+
+static struct video_device typhoon_radio =
+{
+ .owner = THIS_MODULE,
+ .name = "Typhoon Radio",
+ .type = VID_TYPE_TUNER,
+ .hardware = VID_HARDWARE_TYPHOON,
+ .fops = &typhoon_fops,
+};
+
+#ifdef CONFIG_RADIO_TYPHOON_PROC_FS
+
+static int typhoon_get_info(char *buf, char **start, off_t offset, int len)
+{
+ char *out = buf;
+
+ #ifdef MODULE
+ #define MODULEPROCSTRING "Driver loaded as a module"
+ #else
+ #define MODULEPROCSTRING "Driver compiled into kernel"
+ #endif
+
+ /* output must be kept under PAGE_SIZE */
+ out += sprintf(out, BANNER);
+ out += sprintf(out, "Load type: " MODULEPROCSTRING "\n\n");
+ out += sprintf(out, "frequency = %lu kHz\n",
+ typhoon_unit.curfreq >> 4);
+ out += sprintf(out, "volume = %d\n", typhoon_unit.curvol);
+ out += sprintf(out, "mute = %s\n", typhoon_unit.muted ?
+ "on" : "off");
+ out += sprintf(out, "iobase = 0x%x\n", typhoon_unit.iobase);
+ out += sprintf(out, "mute frequency = %lu kHz\n",
+ typhoon_unit.mutefreq >> 4);
+ return out - buf;
+}
+
+#endif /* CONFIG_RADIO_TYPHOON_PROC_FS */
+
+MODULE_AUTHOR("Dr. Henrik Seidel");
+MODULE_DESCRIPTION("A driver for the Typhoon radio card (a.k.a. EcoRadio).");
+MODULE_LICENSE("GPL");
+
+static int io = -1;
+static int radio_nr = -1;
+
+module_param(io, int, 0);
+MODULE_PARM_DESC(io, "I/O address of the Typhoon card (0x316 or 0x336)");
+module_param(radio_nr, int, 0);
+
+#ifdef MODULE
+static unsigned long mutefreq = 0;
+module_param(mutefreq, ulong, 0);
+MODULE_PARM_DESC(mutefreq, "Frequency used when muting the card (in kHz)");
+#endif
+
+static int __init typhoon_init(void)
+{
+#ifdef MODULE
+ 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;
+#endif /* MODULE */
+
+ printk(KERN_INFO BANNER);
+ init_MUTEX(&typhoon_unit.lock);
+ io = typhoon_unit.iobase;
+ if (!request_region(io, 8, "typhoon")) {
+ 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, radio_nr) == -1)
+ {
+ release_region(io, 8);
+ return -EINVAL;
+ }
+ 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 (!create_proc_info_entry("driver/radio-typhoon", 0, NULL,
+ typhoon_get_info))
+ printk(KERN_ERR "radio-typhoon: registering /proc/driver/radio-typhoon failed\n");
+#endif
+
+ return 0;
+}
+
+static void __exit typhoon_cleanup_module(void)
+{
+
+#ifdef CONFIG_RADIO_TYPHOON_PROC_FS
+ remove_proc_entry("driver/radio-typhoon", NULL);
+#endif
+
+ video_unregister_device(&typhoon_radio);
+ release_region(io, 8);
+}
+
+module_init(typhoon_init);
+module_exit(typhoon_cleanup_module);
+
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-23 17:09:46 +0000